diff options
| author | Linus Torvalds <torvalds@linux-foundation.org> | 2022-12-15 09:45:51 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2022-12-15 09:45:51 -0800 |
| commit | c0f234ff90a211272138be1611ba53f3155ebd78 (patch) | |
| tree | 956c32a903675d690631100ae829e810b4b4515b | |
| parent | 9fa4abc9ad2a18410a7087e6cea15ad1ffb172c6 (diff) | |
| parent | 11e47bbd700f31bd1ee9f8863381bc9e741c0e97 (diff) | |
| download | nios2-c0f234ff90a211272138be1611ba53f3155ebd78.tar.gz | |
Merge tag 'gpio-updates-for-v6.2' of git://git.kernel.org/pub/scm/linux/kernel/git/brgl/linux
Pull gpio updates from Bartosz Golaszewski:
"We have a new GPIO multiplexer driver, bunch of driver updates and
refactoring in the core GPIO library.
GPIO core:
- teach gpiolib to work with software nodes for HW description
- remove ARCH_NR_GPIOS treewide as we no longer impose any limit on
the number of GPIOS since the allocation became entirely dynamic
- add support for HW quirks for Cirrus CS42L56 codec, Marvell NFC
controller, Freescale PCIe and Ethernet controller, Himax LCDs and
Mediatek mt2701
- refactor OF quirk code
- some general refactoring of the OF and ACPI code, adding new
helpers, minor tweaks and fixes, making fwnode usage consistent
etc.
GPIO uAPI:
- fix an issue where the user-space can trigger a NULL-pointer
dereference in the kernel by opening a device file, forcing a
driver unbind and then calling one of the syscalls on the
associated file descriptor
New drivers:
- add gpio-latch: a new GPIO multiplexer based on latches connected
to other GPIOs
Driver updates:
- convert i2c GPIO expanders to using .probe_new()
- drop the gpio-sta2x11 driver
- factor out common code for the ACCES IDIO-16 family of controllers
and use this new library wherever applicable in drivers
- add DT support to gpio-hisi
- allow building gpio-davinci as a module and increase its maxItems
property
- add support for a new model to gpio-pca9570
- other minor changes to various drivers"
* tag 'gpio-updates-for-v6.2' of git://git.kernel.org/pub/scm/linux/kernel/git/brgl/linux: (66 commits)
gpio: sim: set a limit on the number of GPIOs
gpiolib: protect the GPIO device against being dropped while in use by user-space
gpiolib: cdev: fix NULL-pointer dereferences
gpiolib: Provide to_gpio_device() helper
gpiolib: Unify access to the device properties
gpio: Do not include <linux/kernel.h> when not really needed.
gpio: pcf857x: Convert to i2c's .probe_new()
gpio: pca953x: Convert to i2c's .probe_new()
gpio: max732x: Convert to i2c's .probe_new()
dt-bindings: gpio: gpio-davinci: Increase maxItems in gpio-line-names
gpiolib: ensure that fwnode is properly set
gpio: sl28cpld: Replace irqchip mask_invert with unmask_base
gpiolib: of: Use correct fwnode for DT-probed chips
gpiolib: of: Drop redundant check in of_mm_gpiochip_remove()
gpiolib: of: Prepare of_mm_gpiochip_add_data() for fwnode
gpiolib: add support for software nodes
gpiolib: consolidate GPIO lookups
gpiolib: acpi: avoid leaking ACPI details into upper gpiolib layers
gpiolib: acpi: teach acpi_find_gpio() to handle data-only nodes
gpiolib: acpi: change acpi_find_gpio() to accept firmware node
...
50 files changed, 1614 insertions, 1213 deletions
diff --git a/Documentation/devicetree/bindings/gpio/gpio-davinci.yaml b/Documentation/devicetree/bindings/gpio/gpio-davinci.yaml index f32e09ef937c02..10e56cf306dbab 100644 --- a/Documentation/devicetree/bindings/gpio/gpio-davinci.yaml +++ b/Documentation/devicetree/bindings/gpio/gpio-davinci.yaml @@ -35,7 +35,7 @@ properties: gpio-line-names: description: strings describing the names of each gpio line. minItems: 1 - maxItems: 100 + maxItems: 144 "#gpio-cells": const: 2 diff --git a/Documentation/devicetree/bindings/gpio/gpio-latch.yaml b/Documentation/devicetree/bindings/gpio/gpio-latch.yaml new file mode 100644 index 00000000000000..1ed82a2cebdaa4 --- /dev/null +++ b/Documentation/devicetree/bindings/gpio/gpio-latch.yaml @@ -0,0 +1,94 @@ +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/gpio/gpio-latch.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: GPIO latch controller + +maintainers: + - Sascha Hauer <s.hauer@pengutronix.de> + +description: | + This binding describes a GPIO multiplexer based on latches connected to + other GPIOs, like this: + + CLK0 ----------------------. ,--------. + CLK1 -------------------. `--------|> #0 | + | | | + OUT0 ----------------+--|-----------|D0 Q0|-----|< + OUT1 --------------+-|--|-----------|D1 Q1|-----|< + OUT2 ------------+-|-|--|-----------|D2 Q2|-----|< + OUT3 ----------+-|-|-|--|-----------|D3 Q3|-----|< + OUT4 --------+-|-|-|-|--|-----------|D4 Q4|-----|< + OUT5 ------+-|-|-|-|-|--|-----------|D5 Q5|-----|< + OUT6 ----+-|-|-|-|-|-|--|-----------|D6 Q6|-----|< + OUT7 --+-|-|-|-|-|-|-|--|-----------|D7 Q7|-----|< + | | | | | | | | | `--------' + | | | | | | | | | + | | | | | | | | | ,--------. + | | | | | | | | `-----------|> #1 | + | | | | | | | | | | + | | | | | | | `--------------|D0 Q0|-----|< + | | | | | | `----------------|D1 Q1|-----|< + | | | | | `------------------|D2 Q2|-----|< + | | | | `--------------------|D3 Q3|-----|< + | | | `----------------------|D4 Q4|-----|< + | | `------------------------|D5 Q5|-----|< + | `--------------------------|D6 Q6|-----|< + `----------------------------|D7 Q7|-----|< + `--------' + + The number of clk-gpios and latched-gpios is not fixed. The actual number + of number of latches and the number of inputs per latch is derived from + the number of GPIOs given in the corresponding device tree properties. + +properties: + compatible: + const: gpio-latch + "#gpio-cells": + const: 2 + + clk-gpios: + description: Array of GPIOs to be used to clock a latch + + latched-gpios: + description: Array of GPIOs to be used as inputs per latch + + setup-duration-ns: + description: Delay in nanoseconds to wait after the latch inputs have been + set up + + clock-duration-ns: + description: Delay in nanoseconds to wait between clock output changes + + gpio-controller: true + + gpio-line-names: true + +required: + - compatible + - "#gpio-cells" + - gpio-controller + - clk-gpios + - latched-gpios + +additionalProperties: false + +examples: + - | + gpio-latch { + #gpio-cells = <2>; + pinctrl-names = "default"; + pinctrl-0 = <&pinctrl_di_do_leds>; + compatible = "gpio-latch"; + gpio-controller; + setup-duration-ns = <100>; + clock-duration-ns = <100>; + + clk-gpios = <&gpio3 7 0>, <&gpio3 8 0>; + latched-gpios = <&gpio3 21 0>, <&gpio3 22 0>, + <&gpio3 23 0>, <&gpio3 24 0>, + <&gpio3 25 0>, <&gpio3 26 0>, + <&gpio3 27 0>, <&gpio3 28 0>; + }; diff --git a/Documentation/devicetree/bindings/gpio/gpio-pca9570.yaml b/Documentation/devicetree/bindings/gpio/gpio-pca9570.yaml index 1acaa0a3d35afe..48bf414aa50ea1 100644 --- a/Documentation/devicetree/bindings/gpio/gpio-pca9570.yaml +++ b/Documentation/devicetree/bindings/gpio/gpio-pca9570.yaml @@ -12,6 +12,7 @@ maintainers: properties: compatible: enum: + - dlg,slg7xl45106 - nxp,pca9570 - nxp,pca9571 diff --git a/Documentation/devicetree/bindings/gpio/hisilicon,ascend910-gpio.yaml b/Documentation/devicetree/bindings/gpio/hisilicon,ascend910-gpio.yaml new file mode 100644 index 00000000000000..735d97d645a09f --- /dev/null +++ b/Documentation/devicetree/bindings/gpio/hisilicon,ascend910-gpio.yaml @@ -0,0 +1,56 @@ +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/gpio/hisilicon,ascend910-gpio.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: HiSilicon common GPIO controller + +maintainers: + - Jay Fang <f.fangjian@huawei.com> + +description: + The HiSilicon common GPIO controller can be used for many different + types of SoC such as Huawei Ascend AI series chips. + +properties: + compatible: + const: hisilicon,ascend910-gpio + + reg: + maxItems: 1 + + interrupts: + maxItems: 1 + + gpio-controller: true + + "#gpio-cells": + const: 2 + + ngpios: + minimum: 1 + maximum: 32 + +required: + - compatible + - reg + - interrupts + - gpio-controller + - "#gpio-cells" + - ngpios + +additionalProperties: false + +examples: + - | + #include <dt-bindings/interrupt-controller/arm-gic.h> + + gpio@840d0000 { + compatible = "hisilicon,ascend910-gpio"; + reg = <0x840d0000 0x1000>; + ngpios = <32>; + gpio-controller; + #gpio-cells = <2>; + interrupts = <GIC_SPI 33 IRQ_TYPE_LEVEL_HIGH>; + }; diff --git a/Documentation/driver-api/gpio/legacy.rst b/Documentation/driver-api/gpio/legacy.rst index 9b12eeb89170f3..e17910cc327193 100644 --- a/Documentation/driver-api/gpio/legacy.rst +++ b/Documentation/driver-api/gpio/legacy.rst @@ -558,11 +558,6 @@ Platform Support To force-enable this framework, a platform's Kconfig will "select" GPIOLIB, else it is up to the user to configure support for GPIO. -It may also provide a custom value for ARCH_NR_GPIOS, so that it better -reflects the number of GPIOs in actual use on that platform, without -wasting static table space. (It should count both built-in/SoC GPIOs and -also ones on GPIO expanders. - If neither of these options are selected, the platform does not support GPIOs through GPIO-lib and the code cannot be enabled by the user. diff --git a/MAINTAINERS b/MAINTAINERS index a608f19da3a9b3..b454c20a5c88ab 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -312,6 +312,13 @@ L: linux-iio@vger.kernel.org S: Maintained F: drivers/counter/104-quad-8.c +ACCES IDIO-16 GPIO LIBRARY +M: William Breathitt Gray <william.gray@linaro.org> +L: linux-gpio@vger.kernel.org +S: Maintained +F: drivers/gpio/gpio-idio-16.c +F: drivers/gpio/gpio-idio-16.h + ACCES PCI-IDIO-16 GPIO DRIVER M: William Breathitt Gray <william.gray@linaro.org> L: linux-gpio@vger.kernel.org @@ -9266,6 +9273,7 @@ HISILICON GPIO DRIVER M: Jay Fang <f.fangjian@huawei.com> L: linux-gpio@vger.kernel.org S: Maintained +F: Documentation/devicetree/bindings/gpio/hisilicon,ascend910-gpio.yaml F: drivers/gpio/gpio-hisi.c HISILICON HIGH PERFORMANCE RSA ENGINE DRIVER (HPRE) diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig index 65d0daf6326218..a0da424fc93aac 100644 --- a/arch/arm/Kconfig +++ b/arch/arm/Kconfig @@ -1158,27 +1158,6 @@ config ARM_PSCI 0022A ("Power State Coordination Interface System Software on ARM processors"). -# The GPIO number here must be sorted by descending number. In case of -# a multiplatform kernel, we just want the highest value required by the -# selected platforms. -config ARCH_NR_GPIO - int - default 2048 if ARCH_INTEL_SOCFPGA - default 1024 if ARCH_BRCMSTB || ARCH_RENESAS || ARCH_TEGRA || \ - ARCH_ZYNQ || ARCH_ASPEED - default 512 if ARCH_EXYNOS || ARCH_KEYSTONE || SOC_OMAP5 || \ - SOC_DRA7XX || ARCH_S3C24XX || ARCH_S3C64XX || ARCH_S5PV210 - default 416 if ARCH_SUNXI - default 392 if ARCH_U8500 - default 352 if ARCH_VT8500 - default 288 if ARCH_ROCKCHIP - default 264 if MACH_H4700 - default 0 - help - Maximum number of GPIOs in the system. - - If unsure, leave the default value. - config HZ_FIXED int default 128 if SOC_AT91RM9200 diff --git a/arch/arm/include/asm/gpio.h b/arch/arm/include/asm/gpio.h index f3bb8a2bf788ef..4ebbb58f06ea62 100644 --- a/arch/arm/include/asm/gpio.h +++ b/arch/arm/include/asm/gpio.h @@ -2,7 +2,6 @@ #ifndef _ARCH_ARM_GPIO_H #define _ARCH_ARM_GPIO_H -/* Note: this may rely upon the value of ARCH_NR_GPIOS set in mach/gpio.h */ #include <asm-generic/gpio.h> /* The trivial gpiolib dispatchers */ diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig index 7fc3457a8891c2..7cb7d635fbcc8c 100644 --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig @@ -2168,18 +2168,6 @@ config STACKPROTECTOR_PER_TASK def_bool y depends on STACKPROTECTOR && CC_HAVE_STACKPROTECTOR_SYSREG -# The GPIO number here must be sorted by descending number. In case of -# a multiplatform kernel, we just want the highest value required by the -# selected platforms. -config ARCH_NR_GPIO - int - default 2048 if ARCH_APPLE - default 0 - help - Maximum number of GPIOs in the system. - - If unsure, leave the default value. - config UNWIND_PATCH_PAC_INTO_SCS bool "Enable shadow call stack dynamically using code patching" # needs Clang with https://reviews.llvm.org/D111780 incorporated diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index 61b4c7bcd4d9fd..7577c3344930ba 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -361,11 +361,6 @@ config ARCH_HAS_CPU_RELAX config ARCH_HIBERNATION_POSSIBLE def_bool y -config ARCH_NR_GPIO - int - default 1024 if X86_64 - default 512 - config ARCH_SUSPEND_POSSIBLE def_bool y diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig index a01af11806164c..ec7cfd4f52b1ea 100644 --- a/drivers/gpio/Kconfig +++ b/drivers/gpio/Kconfig @@ -109,6 +109,15 @@ config GPIO_REGMAP config GPIO_MAX730X tristate +config GPIO_IDIO_16 + tristate + help + Enables support for the idio-16 library functions. The idio-16 library + provides functions to facilitate communication with devices within the + ACCES IDIO-16 family such as the 104-IDIO-16 and the PCI-IDIO-16. + + If built as a module its name will be gpio-idio-16. + menu "Memory mapped GPIO drivers" depends on HAS_IOMEM @@ -219,7 +228,7 @@ config GPIO_CLPS711X Say yes here to support GPIO on CLPS711X SoCs. config GPIO_DAVINCI - bool "TI Davinci/Keystone GPIO support" + tristate "TI Davinci/Keystone GPIO support" default y if ARCH_DAVINCI depends on (ARM || ARM64) && (ARCH_DAVINCI || ARCH_KEYSTONE || ARCH_K3) help @@ -310,7 +319,7 @@ config GPIO_GRGPIO config GPIO_HISI tristate "HiSilicon GPIO controller driver" - depends on (ARM64 && ACPI) || COMPILE_TEST + depends on ARM64 || COMPILE_TEST select GPIO_GENERIC select GPIOLIB_IRQCHIP help @@ -600,14 +609,6 @@ config GPIO_SPRD help Say yes here to support Spreadtrum GPIO device. -config GPIO_STA2X11 - bool "STA2x11/ConneXt GPIO support" - depends on MFD_STA2X11 - select GENERIC_IRQ_CHIP - help - Say yes here to support the STA2x11/ConneXt GPIO device. - The GPIO module has 128 GPIO pins with alternate functions. - config GPIO_STP_XWAY bool "XWAY STP GPIOs" depends on SOC_XWAY || COMPILE_TEST @@ -857,6 +858,7 @@ config GPIO_104_IDIO_16 depends on PC104 select ISA_BUS_API select GPIOLIB_IRQCHIP + select GPIO_IDIO_16 help Enables GPIO support for the ACCES 104-IDIO-16 family (104-IDIO-16, 104-IDIO-16E, 104-IDO-16, 104-IDIO-8, 104-IDIO-8E, 104-IDO-8). The @@ -1561,6 +1563,7 @@ config GPIO_PCH config GPIO_PCI_IDIO_16 tristate "ACCES PCI-IDIO-16 GPIO support" select GPIOLIB_IRQCHIP + select GPIO_IDIO_16 help Enables GPIO support for the ACCES PCI-IDIO-16. An interrupt is generated when any of the inputs change state (low to high or high to @@ -1681,6 +1684,12 @@ config GPIO_AGGREGATOR industrial control context, to be operated from userspace using the GPIO chardev interface. +config GPIO_LATCH + tristate "GPIO latch driver" + help + Say yes here to enable a driver for GPIO multiplexers based on latches + connected to other GPIOs. + config GPIO_MOCKUP tristate "GPIO Testing Driver" select IRQ_SIM diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile index 29e3beb6548cb0..010587025fc871 100644 --- a/drivers/gpio/Makefile +++ b/drivers/gpio/Makefile @@ -10,6 +10,7 @@ obj-$(CONFIG_OF_GPIO) += gpiolib-of.o obj-$(CONFIG_GPIO_CDEV) += gpiolib-cdev.o obj-$(CONFIG_GPIO_SYSFS) += gpiolib-sysfs.o obj-$(CONFIG_GPIO_ACPI) += gpiolib-acpi.o +obj-$(CONFIG_GPIOLIB) += gpiolib-swnode.o # Device drivers. Generally keep list sorted alphabetically obj-$(CONFIG_GPIO_REGMAP) += gpio-regmap.o @@ -68,6 +69,7 @@ obj-$(CONFIG_GPIO_HLWD) += gpio-hlwd.o obj-$(CONFIG_HTC_EGPIO) += gpio-htc-egpio.o obj-$(CONFIG_GPIO_I8255) += gpio-i8255.o obj-$(CONFIG_GPIO_ICH) += gpio-ich.o +obj-$(CONFIG_GPIO_IDIO_16) += gpio-idio-16.o obj-$(CONFIG_GPIO_IDT3243X) += gpio-idt3243x.o obj-$(CONFIG_GPIO_IMX_SCU) += gpio-imx-scu.o obj-$(CONFIG_GPIO_IOP) += gpio-iop.o @@ -75,6 +77,7 @@ obj-$(CONFIG_GPIO_IT87) += gpio-it87.o obj-$(CONFIG_GPIO_IXP4XX) += gpio-ixp4xx.o obj-$(CONFIG_GPIO_JANZ_TTL) += gpio-janz-ttl.o obj-$(CONFIG_GPIO_KEMPLD) += gpio-kempld.o +obj-$(CONFIG_GPIO_LATCH) += gpio-latch.o obj-$(CONFIG_GPIO_LOGICVC) += gpio-logicvc.o obj-$(CONFIG_GPIO_LOONGSON1) += gpio-loongson1.o obj-$(CONFIG_GPIO_LOONGSON) += gpio-loongson.o @@ -140,7 +143,6 @@ obj-$(CONFIG_GPIO_SL28CPLD) += gpio-sl28cpld.o obj-$(CONFIG_GPIO_SODAVILLE) += gpio-sodaville.o obj-$(CONFIG_GPIO_SPEAR_SPICS) += gpio-spear-spics.o obj-$(CONFIG_GPIO_SPRD) += gpio-sprd.o -obj-$(CONFIG_GPIO_STA2X11) += gpio-sta2x11.o obj-$(CONFIG_GPIO_STMPE) += gpio-stmpe.o obj-$(CONFIG_GPIO_STP_XWAY) += gpio-stp-xway.o obj-$(CONFIG_GPIO_SYSCON) += gpio-syscon.o diff --git a/drivers/gpio/TODO b/drivers/gpio/TODO index f87ff3fa8a531d..76560744587a5f 100644 --- a/drivers/gpio/TODO +++ b/drivers/gpio/TODO @@ -124,6 +124,13 @@ Work items: this with dry-coding and sending to maintainers to test +Generic regmap GPIO + +In the very similar way to Generic MMIO GPIO convert the users which can +take advantage of using regmap over direct IO accessors. Note, even in +MMIO case the regmap MMIO with gpio-regmap.c is preferable over gpio-mmio.c. + + GPIOLIB irqchip The GPIOLIB irqchip is a helper irqchip for "simple cases" that should diff --git a/drivers/gpio/gpio-104-idio-16.c b/drivers/gpio/gpio-104-idio-16.c index 718bd54e2a2551..098fbefdbe2268 100644 --- a/drivers/gpio/gpio-104-idio-16.c +++ b/drivers/gpio/gpio-104-idio-16.c @@ -6,7 +6,7 @@ * This driver supports the following ACCES devices: 104-IDIO-16, * 104-IDIO-16E, 104-IDO-16, 104-IDIO-8, 104-IDIO-8E, and 104-IDO-8. */ -#include <linux/bits.h> +#include <linux/bitmap.h> #include <linux/device.h> #include <linux/errno.h> #include <linux/gpio/driver.h> @@ -21,6 +21,8 @@ #include <linux/spinlock.h> #include <linux/types.h> +#include "gpio-idio-16.h" + #define IDIO_16_EXTENT 8 #define MAX_NUM_IDIO_16 max_num_isa_dev(IDIO_16_EXTENT) @@ -35,48 +37,25 @@ module_param_hw_array(irq, uint, irq, &num_irq, 0); MODULE_PARM_DESC(irq, "ACCES 104-IDIO-16 interrupt line numbers"); /** - * struct idio_16_reg - device registers structure - * @out0_7: Read: N/A - * Write: FET Drive Outputs 0-7 - * @in0_7: Read: Isolated Inputs 0-7 - * Write: Clear Interrupt - * @irq_ctl: Read: Enable IRQ - * Write: Disable IRQ - * @unused: N/A - * @out8_15: Read: N/A - * Write: FET Drive Outputs 8-15 - * @in8_15: Read: Isolated Inputs 8-15 - * Write: N/A - */ -struct idio_16_reg { - u8 out0_7; - u8 in0_7; - u8 irq_ctl; - u8 unused; - u8 out8_15; - u8 in8_15; -}; - -/** * struct idio_16_gpio - GPIO device private data structure * @chip: instance of the gpio_chip * @lock: synchronization lock to prevent I/O race conditions * @irq_mask: I/O bits affected by interrupts * @reg: I/O address offset for the device registers - * @out_state: output bits state + * @state: ACCES IDIO-16 device state */ struct idio_16_gpio { struct gpio_chip chip; raw_spinlock_t lock; unsigned long irq_mask; - struct idio_16_reg __iomem *reg; - unsigned int out_state; + struct idio_16 __iomem *reg; + struct idio_16_state state; }; static int idio_16_gpio_get_direction(struct gpio_chip *chip, unsigned int offset) { - if (offset > 15) + if (idio_16_get_direction(offset)) return GPIO_LINE_DIRECTION_IN; return GPIO_LINE_DIRECTION_OUT; @@ -98,15 +77,8 @@ static int idio_16_gpio_direction_output(struct gpio_chip *chip, static int idio_16_gpio_get(struct gpio_chip *chip, unsigned int offset) { struct idio_16_gpio *const idio16gpio = gpiochip_get_data(chip); - const unsigned int mask = BIT(offset-16); - if (offset < 16) - return -EINVAL; - - if (offset < 24) - return !!(ioread8(&idio16gpio->reg->in0_7) & mask); - - return !!(ioread8(&idio16gpio->reg->in8_15) & (mask>>8)); + return idio_16_get(idio16gpio->reg, &idio16gpio->state, offset); } static int idio_16_gpio_get_multiple(struct gpio_chip *chip, @@ -114,11 +86,7 @@ static int idio_16_gpio_get_multiple(struct gpio_chip *chip, { struct idio_16_gpio *const idio16gpio = gpiochip_get_data(chip); - *bits = 0; - if (*mask & GENMASK(23, 16)) - *bits |= (unsigned long)ioread8(&idio16gpio->reg->in0_7) << 16; - if (*mask & GENMASK(31, 24)) - *bits |= (unsigned long)ioread8(&idio16gpio->reg->in8_15) << 24; + idio_16_get_multiple(idio16gpio->reg, &idio16gpio->state, mask, bits); return 0; } @@ -127,44 +95,16 @@ static void idio_16_gpio_set(struct gpio_chip *chip, unsigned int offset, int value) { struct idio_16_gpio *const idio16gpio = gpiochip_get_data(chip); - const unsigned int mask = BIT(offset); - unsigned long flags; - if (offset > 15) - return; - - raw_spin_lock_irqsave(&idio16gpio->lock, flags); - - if (value) - idio16gpio->out_state |= mask; - else - idio16gpio->out_state &= ~mask; - - if (offset > 7) - iowrite8(idio16gpio->out_state >> 8, &idio16gpio->reg->out8_15); - else - iowrite8(idio16gpio->out_state, &idio16gpio->reg->out0_7); - - raw_spin_unlock_irqrestore(&idio16gpio->lock, flags); + idio_16_set(idio16gpio->reg, &idio16gpio->state, offset, value); } static void idio_16_gpio_set_multiple(struct gpio_chip *chip, unsigned long *mask, unsigned long *bits) { struct idio_16_gpio *const idio16gpio = gpiochip_get_data(chip); - unsigned long flags; - raw_spin_lock_irqsave(&idio16gpio->lock, flags); - - idio16gpio->out_state &= ~*mask; - idio16gpio->out_state |= *mask & *bits; - - if (*mask & 0xFF) - iowrite8(idio16gpio->out_state, &idio16gpio->reg->out0_7); - if ((*mask >> 8) & 0xFF) - iowrite8(idio16gpio->out_state >> 8, &idio16gpio->reg->out8_15); - - raw_spin_unlock_irqrestore(&idio16gpio->lock, flags); + idio_16_set_multiple(idio16gpio->reg, &idio16gpio->state, mask, bits); } static void idio_16_irq_ack(struct irq_data *data) @@ -301,7 +241,10 @@ static int idio_16_probe(struct device *dev, unsigned int id) idio16gpio->chip.get_multiple = idio_16_gpio_get_multiple; idio16gpio->chip.set = idio_16_gpio_set; idio16gpio->chip.set_multiple = idio_16_gpio_set_multiple; - idio16gpio->out_state = 0xFFFF; + + idio_16_state_init(&idio16gpio->state); + /* FET off states are represented by bit values of "1" */ + bitmap_fill(idio16gpio->state.out_state, IDIO_16_NOUT); girq = &idio16gpio->chip.irq; gpio_irq_chip_set_chip(girq, &idio_16_irqchip); @@ -343,3 +286,4 @@ module_isa_driver_with_irq(idio_16_driver, num_idio_16, num_irq); MODULE_AUTHOR("William Breathitt Gray <vilhelm.gray@gmail.com>"); MODULE_DESCRIPTION("ACCES 104-IDIO-16 GPIO driver"); MODULE_LICENSE("GPL v2"); +MODULE_IMPORT_NS(GPIO_IDIO_16); diff --git a/drivers/gpio/gpio-aggregator.c b/drivers/gpio/gpio-aggregator.c index 0cb2664085cf83..6d17d262ad9170 100644 --- a/drivers/gpio/gpio-aggregator.c +++ b/drivers/gpio/gpio-aggregator.c @@ -23,6 +23,7 @@ #include <linux/spinlock.h> #include <linux/string.h> +#define AGGREGATOR_MAX_GPIOS 512 /* * GPIO Aggregator sysfs interface @@ -64,7 +65,7 @@ static int aggr_parse(struct gpio_aggregator *aggr) unsigned int i, n = 0; int error = 0; - bitmap = bitmap_alloc(ARCH_NR_GPIOS, GFP_KERNEL); + bitmap = bitmap_alloc(AGGREGATOR_MAX_GPIOS, GFP_KERNEL); if (!bitmap) return -ENOMEM; @@ -84,13 +85,13 @@ static int aggr_parse(struct gpio_aggregator *aggr) } /* GPIO chip + offset(s) */ - error = bitmap_parselist(offsets, bitmap, ARCH_NR_GPIOS); + error = bitmap_parselist(offsets, bitmap, AGGREGATOR_MAX_GPIOS); if (error) { pr_err("Cannot parse %s: %d\n", offsets, error); goto free_bitmap; } - for_each_set_bit(i, bitmap, ARCH_NR_GPIOS) { + for_each_set_bit(i, bitmap, AGGREGATOR_MAX_GPIOS) { error = aggr_add_gpio(aggr, name, i, &n); if (error) goto free_bitmap; diff --git a/drivers/gpio/gpio-davinci.c b/drivers/gpio/gpio-davinci.c index 59c4c48d8296b8..fa51a91afa54fd 100644 --- a/drivers/gpio/gpio-davinci.c +++ b/drivers/gpio/gpio-davinci.c @@ -217,9 +217,6 @@ static int davinci_gpio_probe(struct platform_device *pdev) return -EINVAL; } - if (WARN_ON(ARCH_NR_GPIOS < ngpio)) - ngpio = ARCH_NR_GPIOS; - /* * If there are unbanked interrupts then the number of * interrupts is equal to number of gpios else all are banked so @@ -730,3 +727,14 @@ static int __init davinci_gpio_drv_reg(void) return platform_driver_register(&davinci_gpio_driver); } postcore_initcall(davinci_gpio_drv_reg); + +static void __exit davinci_gpio_exit(void) +{ + platform_driver_unregister(&davinci_gpio_driver); +} +module_exit(davinci_gpio_exit); + +MODULE_AUTHOR("Jan Kotas <jank@cadence.com>"); +MODULE_DESCRIPTION("DAVINCI GPIO driver"); +MODULE_LICENSE("GPL"); +MODULE_ALIAS("platform:gpio-davinci"); diff --git a/drivers/gpio/gpio-exar.c b/drivers/gpio/gpio-exar.c index 482f678c893e5e..df1bdaae441c5e 100644 --- a/drivers/gpio/gpio-exar.c +++ b/drivers/gpio/gpio-exar.c @@ -141,6 +141,7 @@ static const struct regmap_config exar_regmap_config = { .name = "exar-gpio", .reg_bits = 16, .val_bits = 8, + .io_port = true, }; static int gpio_exar_probe(struct platform_device *pdev) diff --git a/drivers/gpio/gpio-ftgpio010.c b/drivers/gpio/gpio-ftgpio010.c index f77a965f5780d8..2728672ef9f839 100644 --- a/drivers/gpio/gpio-ftgpio010.c +++ b/drivers/gpio/gpio-ftgpio010.c @@ -277,7 +277,7 @@ static int ftgpio_gpio_probe(struct platform_device *pdev) dev_err(dev, "unable to init generic GPIO\n"); goto dis_clk; } - g->gc.label = "FTGPIO010"; + g->gc.label = dev_name(dev); g->gc.base = -1; g->gc.parent = dev; g->gc.owner = THIS_MODULE; diff --git a/drivers/gpio/gpio-gw-pld.c b/drivers/gpio/gpio-gw-pld.c index 2109803ffb386a..5057fa9ad6108a 100644 --- a/drivers/gpio/gpio-gw-pld.c +++ b/drivers/gpio/gpio-gw-pld.c @@ -67,8 +67,7 @@ static void gw_pld_set8(struct gpio_chip *gc, unsigned offset, int value) gw_pld_output8(gc, offset, value); } -static int gw_pld_probe(struct i2c_client *client, - const struct i2c_device_id *id) +static int gw_pld_probe(struct i2c_client *client) { struct device *dev = &client->dev; struct gw_pld *gw; @@ -126,7 +125,7 @@ static struct i2c_driver gw_pld_driver = { .name = "gw_pld", .of_match_table = gw_pld_dt_ids, }, - .probe = gw_pld_probe, + .probe_new = gw_pld_probe, .id_table = gw_pld_id, }; module_i2c_driver(gw_pld_driver); diff --git a/drivers/gpio/gpio-hisi.c b/drivers/gpio/gpio-hisi.c index 3caabef5c7a2ea..55bd69043bf429 100644 --- a/drivers/gpio/gpio-hisi.c +++ b/drivers/gpio/gpio-hisi.c @@ -221,6 +221,12 @@ static const struct acpi_device_id hisi_gpio_acpi_match[] = { }; MODULE_DEVICE_TABLE(acpi, hisi_gpio_acpi_match); +static const struct of_device_id hisi_gpio_dts_match[] = { + { .compatible = "hisilicon,ascend910-gpio", }, + { } +}; +MODULE_DEVICE_TABLE(of, hisi_gpio_dts_match); + static void hisi_gpio_get_pdata(struct device *dev, struct hisi_gpio *hisi_gpio) { @@ -311,6 +317,7 @@ static struct platform_driver hisi_gpio_driver = { .driver = { .name = HISI_GPIO_DRIVER_NAME, .acpi_match_table = hisi_gpio_acpi_match, + .of_match_table = hisi_gpio_dts_match, }, .probe = hisi_gpio_probe, }; diff --git a/drivers/gpio/gpio-idio-16.c b/drivers/gpio/gpio-idio-16.c new file mode 100644 index 00000000000000..13315242d2209e --- /dev/null +++ b/drivers/gpio/gpio-idio-16.c @@ -0,0 +1,146 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * GPIO library for the ACCES IDIO-16 family + * Copyright (C) 2022 William Breathitt Gray + */ +#include <linux/bitmap.h> +#include <linux/export.h> +#include <linux/io.h> +#include <linux/module.h> +#include <linux/spinlock.h> +#include <linux/types.h> + +#include "gpio-idio-16.h" + +#define DEFAULT_SYMBOL_NAMESPACE GPIO_IDIO_16 + +/** + * idio_16_get - get signal value at signal offset + * @reg: ACCES IDIO-16 device registers + * @state: ACCES IDIO-16 device state + * @offset: offset of signal to get + * + * Returns the signal value (0=low, 1=high) for the signal at @offset. + */ +int idio_16_get(struct idio_16 __iomem *const reg, + struct idio_16_state *const state, const unsigned long offset) +{ + const unsigned long mask = BIT(offset); + + if (offset < IDIO_16_NOUT) + return test_bit(offset, state->out_state); + + if (offset < 24) + return !!(ioread8(®->in0_7) & (mask >> IDIO_16_NOUT)); + + if (offset < 32) + return !!(ioread8(®->in8_15) & (mask >> 24)); + + return -EINVAL; +} +EXPORT_SYMBOL_GPL(idio_16_get); + +/** + * idio_16_get_multiple - get multiple signal values at multiple signal offsets + * @reg: ACCES IDIO-16 device registers + * @state: ACCES IDIO-16 device state + * @mask: mask of signals to get + * @bits: bitmap to store signal values + * + * Stores in @bits the values (0=low, 1=high) for the signals defined by @mask. + */ +void idio_16_get_multiple(struct idio_16 __iomem *const reg, + struct idio_16_state *const state, + const unsigned long *const mask, + unsigned long *const bits) +{ + unsigned long flags; + const unsigned long out_mask = GENMASK(IDIO_16_NOUT - 1, 0); + + spin_lock_irqsave(&state->lock, flags); + + bitmap_replace(bits, bits, state->out_state, &out_mask, IDIO_16_NOUT); + if (*mask & GENMASK(23, 16)) + bitmap_set_value8(bits, ioread8(®->in0_7), 16); + if (*mask & GENMASK(31, 24)) + bitmap_set_value8(bits, ioread8(®->in8_15), 24); + + spin_unlock_irqrestore(&state->lock, flags); +} +EXPORT_SYMBOL_GPL(idio_16_get_multiple); + +/** + * idio_16_set - set signal value at signal offset + * @reg: ACCES IDIO-16 device registers + * @state: ACCES IDIO-16 device state + * @offset: offset of signal to set + * @value: value of signal to set + * + * Assigns output @value for the signal at @offset. + */ +void idio_16_set(struct idio_16 __iomem *const reg, + struct idio_16_state *const state, const unsigned long offset, + const unsigned long value) +{ + unsigned long flags; + + if (offset >= IDIO_16_NOUT) + return; + + spin_lock_irqsave(&state->lock, flags); + + __assign_bit(offset, state->out_state, value); + if (offset < 8) + iowrite8(bitmap_get_value8(state->out_state, 0), ®->out0_7); + else + iowrite8(bitmap_get_value8(state->out_state, 8), ®->out8_15); + + spin_unlock_irqrestore(&state->lock, flags); +} +EXPORT_SYMBOL_GPL(idio_16_set); + +/** + * idio_16_set_multiple - set signal values at multiple signal offsets + * @reg: ACCES IDIO-16 device registers + * @state: ACCES IDIO-16 device state + * @mask: mask of signals to set + * @bits: bitmap of signal output values + * + * Assigns output values defined by @bits for the signals defined by @mask. + */ +void idio_16_set_multiple(struct idio_16 __iomem *const reg, + struct idio_16_state *const state, + const unsigned long *const mask, + const unsigned long *const bits) +{ + unsigned long flags; + + spin_lock_irqsave(&state->lock, flags); + + bitmap_replace(state->out_state, state->out_state, bits, mask, + IDIO_16_NOUT); + if (*mask & GENMASK(7, 0)) + iowrite8(bitmap_get_value8(state->out_state, 0), ®->out0_7); + if (*mask & GENMASK(15, 8)) + iowrite8(bitmap_get_value8(state->out_state, 8), ®->out8_15); + + spin_unlock_irqrestore(&state->lock, flags); +} +EXPORT_SYMBOL_GPL(idio_16_set_multiple); + +/** + * idio_16_state_init - initialize idio_16_state structure + * @state: ACCES IDIO-16 device state + * + * Initializes the ACCES IDIO-16 device @state for use in idio-16 library + * functions. + */ +void idio_16_state_init(struct idio_16_state *const state) +{ + spin_lock_init(&state->lock); +} +EXPORT_SYMBOL_GPL(idio_16_state_init); + +MODULE_AUTHOR("William Breathitt Gray"); +MODULE_DESCRIPTION("ACCES IDIO-16 GPIO Library"); +MODULE_LICENSE("GPL"); diff --git a/drivers/gpio/gpio-idio-16.h b/drivers/gpio/gpio-idio-16.h new file mode 100644 index 00000000000000..928f8251a2bd9e --- /dev/null +++ b/drivers/gpio/gpio-idio-16.h @@ -0,0 +1,71 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* Copyright 2022 William Breathitt Gray */ +#ifndef _IDIO_16_H_ +#define _IDIO_16_H_ + +#include <linux/spinlock.h> +#include <linux/types.h> + +/** + * struct idio_16 - IDIO-16 registers structure + * @out0_7: Read: FET Drive Outputs 0-7 + * Write: FET Drive Outputs 0-7 + * @in0_7: Read: Isolated Inputs 0-7 + * Write: Clear Interrupt + * @irq_ctl: Read: Enable IRQ + * Write: Disable IRQ + * @filter_ctl: Read: Activate Input Filters 0-15 + * Write: Deactivate Input Filters 0-15 + * @out8_15: Read: FET Drive Outputs 8-15 + * Write: FET Drive Outputs 8-15 + * @in8_15: Read: Isolated Inputs 8-15 + * Write: Unused + * @irq_status: Read: Interrupt status + * Write: Unused + */ +struct idio_16 { + u8 out0_7; + u8 in0_7; + u8 irq_ctl; + u8 filter_ctl; + u8 out8_15; + u8 in8_15; + u8 irq_status; +}; + +#define IDIO_16_NOUT 16 + +/** + * struct idio_16_state - IDIO-16 state structure + * @lock: synchronization lock for accessing device state + * @out_state: output signals state + */ +struct idio_16_state { + spinlock_t lock; + DECLARE_BITMAP(out_state, IDIO_16_NOUT); +}; + +/** + * idio_16_get_direction - get the I/O direction for a signal offset + * @offset: offset of signal to get direction + * + * Returns the signal direction (0=output, 1=input) for the signal at @offset. + */ +static inline int idio_16_get_direction(const unsigned long offset) +{ + return (offset >= IDIO_16_NOUT) ? 1 : 0; +} + +int idio_16_get(struct idio_16 __iomem *reg, struct idio_16_state *state, + unsigned long offset); +void idio_16_get_multiple(struct idio_16 __iomem *reg, + struct idio_16_state *state, + const unsigned long *mask, unsigned long *bits); +void idio_16_set(struct idio_16 __iomem *reg, struct idio_16_state *state, + unsigned long offset, unsigned long value); +void idio_16_set_multiple(struct idio_16 __iomem *reg, + struct idio_16_state *state, + const unsigned long *mask, const unsigned long *bits); +void idio_16_state_init(struct idio_16_state *state); + +#endif /* _IDIO_16_H_ */ diff --git a/drivers/gpio/gpio-latch.c b/drivers/gpio/gpio-latch.c new file mode 100644 index 00000000000000..d7c3b20c8482ec --- /dev/null +++ b/drivers/gpio/gpio-latch.c @@ -0,0 +1,219 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * GPIO latch driver + * + * Copyright (C) 2022 Sascha Hauer <s.hauer@pengutronix.de> + * + * This driver implements a GPIO (or better GPO as there is no input) + * multiplexer based on latches like this: + * + * CLK0 ----------------------. ,--------. + * CLK1 -------------------. `--------|> #0 | + * | | | + * OUT0 ----------------+--|-----------|D0 Q0|-----|< + * OUT1 --------------+-|--|-----------|D1 Q1|-----|< + * OUT2 ------------+-|-|--|-----------|D2 Q2|-----|< + * OUT3 ----------+-|-|-|--|-----------|D3 Q3|-----|< + * OUT4 --------+-|-|-|-|--|-----------|D4 Q4|-----|< + * OUT5 ------+-|-|-|-|-|--|-----------|D5 Q5|-----|< + * OUT6 ----+-|-|-|-|-|-|--|-----------|D6 Q6|-----|< + * OUT7 --+-|-|-|-|-|-|-|--|-----------|D7 Q7|-----|< + * | | | | | | | | | `--------' + * | | | | | | | | | + * | | | | | | | | | ,--------. + * | | | | | | | | `-----------|> #1 | + * | | | | | | | | | | + * | | | | | | | `--------------|D0 Q0|-----|< + * | | | | | | `----------------|D1 Q1|-----|< + * | | | | | `------------------|D2 Q2|-----|< + * | | | | `--------------------|D3 Q3|-----|< + * | | | `----------------------|D4 Q4|-----|< + * | | `------------------------|D5 Q5|-----|< + * | `--------------------------|D6 Q6|-----|< + * `----------------------------|D7 Q7|-----|< + * `--------' + * + * The above is just an example. The actual number of number of latches and + * the number of inputs per latch is derived from the number of GPIOs given + * in the corresponding device tree properties. + */ + +#include <linux/err.h> +#include <linux/gpio/consumer.h> +#include <linux/gpio/driver.h> +#include <linux/module.h> +#include <linux/mod_devicetable.h> +#include <linux/platform_device.h> +#include <linux/delay.h> + +#include "gpiolib.h" + +struct gpio_latch_priv { + struct gpio_chip gc; + struct gpio_descs *clk_gpios; + struct gpio_descs *latched_gpios; + int n_latched_gpios; + unsigned int setup_duration_ns; + unsigned int clock_duration_ns; + unsigned long *shadow; + /* + * Depending on whether any of the underlying GPIOs may sleep we either + * use a mutex or a spinlock to protect our shadow map. + */ + union { + struct mutex mutex; /* protects @shadow */ + spinlock_t spinlock; /* protects @shadow */ + }; +}; + +static int gpio_latch_get_direction(struct gpio_chip *gc, unsigned int offset) +{ + return GPIO_LINE_DIRECTION_OUT; +} + +static void gpio_latch_set_unlocked(struct gpio_latch_priv *priv, + void (*set)(struct gpio_desc *desc, int value), + unsigned int offset, bool val) +{ + int latch = offset / priv->n_latched_gpios; + int i; + + assign_bit(offset, priv->shadow, val); + + for (i = 0; i < priv->n_latched_gpios; i++) + set(priv->latched_gpios->desc[i], + test_bit(latch * priv->n_latched_gpios + i, priv->shadow)); + + ndelay(priv->setup_duration_ns); + set(priv->clk_gpios->desc[latch], 1); + ndelay(priv->clock_duration_ns); + set(priv->clk_gpios->desc[latch], 0); +} + +static void gpio_latch_set(struct gpio_chip *gc, unsigned int offset, int val) +{ + struct gpio_latch_priv *priv = gpiochip_get_data(gc); + unsigned long flags; + + spin_lock_irqsave(&priv->spinlock, flags); + + gpio_latch_set_unlocked(priv, gpiod_set_value, offset, val); + + spin_unlock_irqrestore(&priv->spinlock, flags); +} + +static void gpio_latch_set_can_sleep(struct gpio_chip *gc, unsigned int offset, int val) +{ + struct gpio_latch_priv *priv = gpiochip_get_data(gc); + + mutex_lock(&priv->mutex); + + gpio_latch_set_unlocked(priv, gpiod_set_value_cansleep, offset, val); + + mutex_unlock(&priv->mutex); +} + +static bool gpio_latch_can_sleep(struct gpio_latch_priv *priv, unsigned int n_latches) +{ + int i; + + for (i = 0; i < n_latches; i++) + if (gpiod_cansleep(priv->clk_gpios->desc[i])) + return true; + + for (i = 0; i < priv->n_latched_gpios; i++) + if (gpiod_cansleep(priv->latched_gpios->desc[i])) + return true; + + return false; +} + +/* + * Some value which is still acceptable to delay in atomic context. + * If we need to go higher we might have to switch to usleep_range(), + * but that cannot ne used in atomic context and the driver would have + * to be adjusted to support that. + */ +#define DURATION_NS_MAX 5000 + +static int gpio_latch_probe(struct platform_device *pdev) +{ + struct gpio_latch_priv *priv; + unsigned int n_latches; + struct device_node *np = pdev->dev.of_node; + + priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL); + if (!priv) + return -ENOMEM; + + priv->clk_gpios = devm_gpiod_get_array(&pdev->dev, "clk", GPIOD_OUT_LOW); + if (IS_ERR(priv->clk_gpios)) + return PTR_ERR(priv->clk_gpios); + + priv->latched_gpios = devm_gpiod_get_array(&pdev->dev, "latched", GPIOD_OUT_LOW); + if (IS_ERR(priv->latched_gpios)) + return PTR_ERR(priv->latched_gpios); + + n_latches = priv->clk_gpios->ndescs; + priv->n_latched_gpios = priv->latched_gpios->ndescs; + + priv->shadow = devm_bitmap_zalloc(&pdev->dev, n_latches * priv->n_latched_gpios, + GFP_KERNEL); + if (!priv->shadow) + return -ENOMEM; + + if (gpio_latch_can_sleep(priv, n_latches)) { + priv->gc.can_sleep = true; + priv->gc.set = gpio_latch_set_can_sleep; + mutex_init(&priv->mutex); + } else { + priv->gc.can_sleep = false; + priv->gc.set = gpio_latch_set; + spin_lock_init(&priv->spinlock); + } + + of_property_read_u32(np, "setup-duration-ns", &priv->setup_duration_ns); + if (priv->setup_duration_ns > DURATION_NS_MAX) { + dev_warn(&pdev->dev, "setup-duration-ns too high, limit to %d\n", + DURATION_NS_MAX); + priv->setup_duration_ns = DURATION_NS_MAX; + } + + of_property_read_u32(np, "clock-duration-ns", &priv->clock_duration_ns); + if (priv->clock_duration_ns > DURATION_NS_MAX) { + dev_warn(&pdev->dev, "clock-duration-ns too high, limit to %d\n", + DURATION_NS_MAX); + priv->clock_duration_ns = DURATION_NS_MAX; + } + + priv->gc.get_direction = gpio_latch_get_direction; + priv->gc.ngpio = n_latches * priv->n_latched_gpios; + priv->gc.owner = THIS_MODULE; + priv->gc.base = -1; + priv->gc.parent = &pdev->dev; + + platform_set_drvdata(pdev, priv); + + return devm_gpiochip_add_data(&pdev->dev, &priv->gc, priv); +} + +static const struct of_device_id gpio_latch_ids[] = { + { + .compatible = "gpio-latch", + }, + { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(of, gpio_latch_ids); + +static struct platform_driver gpio_latch_driver = { + .driver = { + .name = "gpio-latch", + .of_match_table = gpio_latch_ids, + }, + .probe = gpio_latch_probe, +}; +module_platform_driver(gpio_latch_driver); + +MODULE_LICENSE("GPL v2"); +MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de>"); +MODULE_DESCRIPTION("GPIO latch driver"); diff --git a/drivers/gpio/gpio-max7300.c b/drivers/gpio/gpio-max7300.c index 43da381a4d7e7e..cf482f4f009829 100644 --- a/drivers/gpio/gpio-max7300.c +++ b/drivers/gpio/gpio-max7300.c @@ -28,8 +28,7 @@ static int max7300_i2c_read(struct device *dev, unsigned int reg) return i2c_smbus_read_byte_data(client, reg); } -static int max7300_probe(struct i2c_client *client, - const struct i2c_device_id *id) +static int max7300_probe(struct i2c_client *client) { struct max7301 *ts; @@ -63,7 +62,7 @@ static struct i2c_driver max7300_driver = { .driver = { .name = "max7300", }, - .probe = max7300_probe, + .probe_new = max7300_probe, .remove = max7300_remove, .id_table = max7300_id, }; diff --git a/drivers/gpio/gpio-max732x.c b/drivers/gpio/gpio-max732x.c index da69721170308e..68e982cdee734d 100644 --- a/drivers/gpio/gpio-max732x.c +++ b/drivers/gpio/gpio-max732x.c @@ -608,9 +608,9 @@ static struct max732x_platform_data *of_gpio_max732x(struct device *dev) return pdata; } -static int max732x_probe(struct i2c_client *client, - const struct i2c_device_id *id) +static int max732x_probe(struct i2c_client *client) { + const struct i2c_device_id *id = i2c_client_get_device_id(client); struct max732x_platform_data *pdata; struct device_node *node; struct max732x_chip *chip; @@ -707,7 +707,7 @@ static struct i2c_driver max732x_driver = { .name = "max732x", .of_match_table = of_match_ptr(max732x_of_table), }, - .probe = max732x_probe, + .probe_new = max732x_probe, .id_table = max732x_id, }; diff --git a/drivers/gpio/gpio-merrifield.c b/drivers/gpio/gpio-merrifield.c index 72ac09a597029f..92ea8411050dda 100644 --- a/drivers/gpio/gpio-merrifield.c +++ b/drivers/gpio/gpio-merrifield.c @@ -14,6 +14,7 @@ #include <linux/module.h> #include <linux/pci.h> #include <linux/pinctrl/consumer.h> +#include <linux/string_helpers.h> #define GCCR 0x000 /* controller configuration */ #define GPLR 0x004 /* pin level r/o */ @@ -331,7 +332,7 @@ static int mrfld_irq_set_wake(struct irq_data *d, unsigned int on) raw_spin_unlock_irqrestore(&priv->lock, flags); - dev_dbg(priv->dev, "%sable wake for gpio %u\n", on ? "en" : "dis", gpio); + dev_dbg(priv->dev, "%s wake for gpio %u\n", str_enable_disable(on), gpio); return 0; } diff --git a/drivers/gpio/gpio-pca953x.c b/drivers/gpio/gpio-pca953x.c index 6e67867e1dcd48..a59d61cd44b2e5 100644 --- a/drivers/gpio/gpio-pca953x.c +++ b/drivers/gpio/gpio-pca953x.c @@ -1050,9 +1050,9 @@ out: return ret; } -static int pca953x_probe(struct i2c_client *client, - const struct i2c_device_id *i2c_id) +static int pca953x_probe(struct i2c_client *client) { + const struct i2c_device_id *i2c_id = i2c_client_get_device_id(client); struct pca953x_platform_data *pdata; struct pca953x_chip *chip; int irq_base = 0; @@ -1376,7 +1376,7 @@ static struct i2c_driver pca953x_driver = { .of_match_table = pca953x_dt_ids, .acpi_match_table = pca953x_acpi_ids, }, - .probe = pca953x_probe, + .probe_new = pca953x_probe, .remove = pca953x_remove, .id_table = pca953x_id, }; diff --git a/drivers/gpio/gpio-pca9570.c b/drivers/gpio/gpio-pca9570.c index ab2a652964ec2f..6c07a8811a7a5e 100644 --- a/drivers/gpio/gpio-pca9570.c +++ b/drivers/gpio/gpio-pca9570.c @@ -15,14 +15,28 @@ #include <linux/mutex.h> #include <linux/property.h> +#define SLG7XL45106_GPO_REG 0xDB + +/** + * struct pca9570_platform_data - GPIO platformdata + * @ngpio: no of gpios + * @command: Command to be sent + */ +struct pca9570_platform_data { + u16 ngpio; + u32 command; +}; + /** * struct pca9570 - GPIO driver data * @chip: GPIO controller chip + * @p_data: GPIO controller platform data * @lock: Protects write sequences * @out: Buffer for device register */ struct pca9570 { struct gpio_chip chip; + const struct pca9570_platform_data *p_data; struct mutex lock; u8 out; }; @@ -32,7 +46,11 @@ static int pca9570_read(struct pca9570 *gpio, u8 *value) struct i2c_client *client = to_i2c_client(gpio->chip.parent); int ret; - ret = i2c_smbus_read_byte(client); + if (gpio->p_data->command != 0) + ret = i2c_smbus_read_byte_data(client, gpio->p_data->command); + else + ret = i2c_smbus_read_byte(client); + if (ret < 0) return ret; @@ -44,6 +62,9 @@ static int pca9570_write(struct pca9570 *gpio, u8 value) { struct i2c_client *client = to_i2c_client(gpio->chip.parent); + if (gpio->p_data->command != 0) + return i2c_smbus_write_byte_data(client, gpio->p_data->command, value); + return i2c_smbus_write_byte(client, value); } @@ -106,7 +127,8 @@ static int pca9570_probe(struct i2c_client *client) gpio->chip.get = pca9570_get; gpio->chip.set = pca9570_set; gpio->chip.base = -1; - gpio->chip.ngpio = (uintptr_t)device_get_match_data(&client->dev); + gpio->p_data = device_get_match_data(&client->dev); + gpio->chip.ngpio = gpio->p_data->ngpio; gpio->chip.can_sleep = true; mutex_init(&gpio->lock); @@ -119,16 +141,31 @@ static int pca9570_probe(struct i2c_client *client) return devm_gpiochip_add_data(&client->dev, &gpio->chip, gpio); } +static const struct pca9570_platform_data pca9570_gpio = { + .ngpio = 4, +}; + +static const struct pca9570_platform_data pca9571_gpio = { + .ngpio = 8, +}; + +static const struct pca9570_platform_data slg7xl45106_gpio = { + .ngpio = 8, + .command = SLG7XL45106_GPO_REG, +}; + static const struct i2c_device_id pca9570_id_table[] = { - { "pca9570", 4 }, - { "pca9571", 8 }, + { "pca9570", (kernel_ulong_t)&pca9570_gpio}, + { "pca9571", (kernel_ulong_t)&pca9571_gpio }, + { "slg7xl45106", (kernel_ulong_t)&slg7xl45106_gpio }, { /* sentinel */ } }; MODULE_DEVICE_TABLE(i2c, pca9570_id_table); static const struct of_device_id pca9570_of_match_table[] = { - { .compatible = "nxp,pca9570", .data = (void *)4 }, - { .compatible = "nxp,pca9571", .data = (void *)8 }, + { .compatible = "dlg,slg7xl45106", .data = &slg7xl45106_gpio}, + { .compatible = "nxp,pca9570", .data = &pca9570_gpio }, + { .compatible = "nxp,pca9571", .data = &pca9571_gpio }, { /* sentinel */ } }; MODULE_DEVICE_TABLE(of, pca9570_of_match_table); diff --git a/drivers/gpio/gpio-pcf857x.c b/drivers/gpio/gpio-pcf857x.c index e98ea47d723798..cec2f2c78255f5 100644 --- a/drivers/gpio/gpio-pcf857x.c +++ b/drivers/gpio/gpio-pcf857x.c @@ -247,9 +247,9 @@ static const struct irq_chip pcf857x_irq_chip = { /*-------------------------------------------------------------------------*/ -static int pcf857x_probe(struct i2c_client *client, - const struct i2c_device_id *id) +static int pcf857x_probe(struct i2c_client *client) { + const struct i2c_device_id *id = i2c_client_get_device_id(client); struct pcf857x_platform_data *pdata = dev_get_platdata(&client->dev); struct device_node *np = client->dev.of_node; struct pcf857x *gpio; @@ -422,7 +422,7 @@ static struct i2c_driver pcf857x_driver = { .name = "pcf857x", .of_match_table = of_match_ptr(pcf857x_of_table), }, - .probe = pcf857x_probe, + .probe_new = pcf857x_probe, .remove = pcf857x_remove, .shutdown = pcf857x_shutdown, .id_table = pcf857x_id, diff --git a/drivers/gpio/gpio-pci-idio-16.c b/drivers/gpio/gpio-pci-idio-16.c index 71a13a394050ff..a86ce748384bba 100644 --- a/drivers/gpio/gpio-pci-idio-16.c +++ b/drivers/gpio/gpio-pci-idio-16.c @@ -3,8 +3,7 @@ * GPIO driver for the ACCES PCI-IDIO-16 * Copyright (C) 2017 William Breathitt Gray */ -#include <linux/bitmap.h> -#include <linux/bitops.h> +#include <linux/bits.h> #include <linux/device.h> #include <linux/errno.h> #include <linux/gpio/driver.h> @@ -16,51 +15,28 @@ #include <linux/spinlock.h> #include <linux/types.h> -/** - * struct idio_16_gpio_reg - GPIO device registers structure - * @out0_7: Read: FET Drive Outputs 0-7 - * Write: FET Drive Outputs 0-7 - * @in0_7: Read: Isolated Inputs 0-7 - * Write: Clear Interrupt - * @irq_ctl: Read: Enable IRQ - * Write: Disable IRQ - * @filter_ctl: Read: Activate Input Filters 0-15 - * Write: Deactivate Input Filters 0-15 - * @out8_15: Read: FET Drive Outputs 8-15 - * Write: FET Drive Outputs 8-15 - * @in8_15: Read: Isolated Inputs 8-15 - * Write: Unused - * @irq_status: Read: Interrupt status - * Write: Unused - */ -struct idio_16_gpio_reg { - u8 out0_7; - u8 in0_7; - u8 irq_ctl; - u8 filter_ctl; - u8 out8_15; - u8 in8_15; - u8 irq_status; -}; +#include "gpio-idio-16.h" /** * struct idio_16_gpio - GPIO device private data structure * @chip: instance of the gpio_chip * @lock: synchronization lock to prevent I/O race conditions * @reg: I/O address offset for the GPIO device registers + * @state: ACCES IDIO-16 device state * @irq_mask: I/O bits affected by interrupts */ struct idio_16_gpio { struct gpio_chip chip; raw_spinlock_t lock; - struct idio_16_gpio_reg __iomem *reg; + struct idio_16 __iomem *reg; + struct idio_16_state state; unsigned long irq_mask; }; static int idio_16_gpio_get_direction(struct gpio_chip *chip, unsigned int offset) { - if (offset > 15) + if (idio_16_get_direction(offset)) return GPIO_LINE_DIRECTION_IN; return GPIO_LINE_DIRECTION_OUT; @@ -82,43 +58,16 @@ static int idio_16_gpio_direction_output(struct gpio_chip *chip, static int idio_16_gpio_get(struct gpio_chip *chip, unsigned int offset) { struct idio_16_gpio *const idio16gpio = gpiochip_get_data(chip); - unsigned long mask = BIT(offset); - - if (offset < 8) - return !!(ioread8(&idio16gpio->reg->out0_7) & mask); - - if (offset < 16) - return !!(ioread8(&idio16gpio->reg->out8_15) & (mask >> 8)); - - if (offset < 24) - return !!(ioread8(&idio16gpio->reg->in0_7) & (mask >> 16)); - return !!(ioread8(&idio16gpio->reg->in8_15) & (mask >> 24)); + return idio_16_get(idio16gpio->reg, &idio16gpio->state, offset); } static int idio_16_gpio_get_multiple(struct gpio_chip *chip, unsigned long *mask, unsigned long *bits) { struct idio_16_gpio *const idio16gpio = gpiochip_get_data(chip); - unsigned long offset; - unsigned long gpio_mask; - void __iomem *ports[] = { - &idio16gpio->reg->out0_7, &idio16gpio->reg->out8_15, - &idio16gpio->reg->in0_7, &idio16gpio->reg->in8_15, - }; - void __iomem *port_addr; - unsigned long port_state; - - /* clear bits array to a clean slate */ - bitmap_zero(bits, chip->ngpio); - - for_each_set_clump8(offset, gpio_mask, mask, ARRAY_SIZE(ports) * 8) { - port_addr = ports[offset / 8]; - port_state = ioread8(port_addr) & gpio_mask; - - bitmap_set_value8(bits, port_state, offset); - } + idio_16_get_multiple(idio16gpio->reg, &idio16gpio->state, mask, bits); return 0; } @@ -126,61 +75,16 @@ static void idio_16_gpio_set(struct gpio_chip *chip, unsigned int offset, int value) { struct idio_16_gpio *const idio16gpio = gpiochip_get_data(chip); - unsigned int mask = BIT(offset); - void __iomem *base; - unsigned long flags; - unsigned int out_state; - - if (offset > 15) - return; - - if (offset > 7) { - mask >>= 8; - base = &idio16gpio->reg->out8_15; - } else - base = &idio16gpio->reg->out0_7; - - raw_spin_lock_irqsave(&idio16gpio->lock, flags); - if (value) - out_state = ioread8(base) | mask; - else - out_state = ioread8(base) & ~mask; - - iowrite8(out_state, base); - - raw_spin_unlock_irqrestore(&idio16gpio->lock, flags); + idio_16_set(idio16gpio->reg, &idio16gpio->state, offset, value); } static void idio_16_gpio_set_multiple(struct gpio_chip *chip, unsigned long *mask, unsigned long *bits) { struct idio_16_gpio *const idio16gpio = gpiochip_get_data(chip); - unsigned long offset; - unsigned long gpio_mask; - void __iomem *ports[] = { - &idio16gpio->reg->out0_7, &idio16gpio->reg->out8_15, - }; - size_t index; - void __iomem *port_addr; - unsigned long bitmask; - unsigned long flags; - unsigned long out_state; - for_each_set_clump8(offset, gpio_mask, mask, ARRAY_SIZE(ports) * 8) { - index = offset / 8; - port_addr = ports[index]; - - bitmask = bitmap_get_value8(bits, offset) & gpio_mask; - - raw_spin_lock_irqsave(&idio16gpio->lock, flags); - - out_state = ioread8(port_addr) & ~gpio_mask; - out_state |= bitmask; - iowrite8(out_state, port_addr); - - raw_spin_unlock_irqrestore(&idio16gpio->lock, flags); - } + idio_16_set_multiple(idio16gpio->reg, &idio16gpio->state, mask, bits); } static void idio_16_irq_ack(struct irq_data *data) @@ -335,6 +239,8 @@ static int idio_16_probe(struct pci_dev *pdev, const struct pci_device_id *id) idio16gpio->chip.set = idio_16_gpio_set; idio16gpio->chip.set_multiple = idio_16_gpio_set_multiple; + idio_16_state_init(&idio16gpio->state); + girq = &idio16gpio->chip.irq; girq->chip = &idio_16_irqchip; /* This will let us handle the parent IRQ in the driver */ @@ -379,3 +285,4 @@ module_pci_driver(idio_16_driver); MODULE_AUTHOR("William Breathitt Gray <vilhelm.gray@gmail.com>"); MODULE_DESCRIPTION("ACCES PCI-IDIO-16 GPIO driver"); MODULE_LICENSE("GPL v2"); +MODULE_IMPORT_NS(GPIO_IDIO_16); diff --git a/drivers/gpio/gpio-sim.c b/drivers/gpio/gpio-sim.c index 1020c2feb24964..60514bc5454f8c 100644 --- a/drivers/gpio/gpio-sim.c +++ b/drivers/gpio/gpio-sim.c @@ -31,6 +31,7 @@ #include "gpiolib.h" +#define GPIO_SIM_NGPIO_MAX 1024 #define GPIO_SIM_PROP_MAX 4 /* Max 3 properties + sentinel. */ #define GPIO_SIM_NUM_ATTRS 3 /* value, pull and sentinel */ @@ -371,6 +372,9 @@ static int gpio_sim_add_bank(struct fwnode_handle *swnode, struct device *dev) if (ret) return ret; + if (num_lines > GPIO_SIM_NGPIO_MAX) + return -ERANGE; + ret = fwnode_property_read_string(swnode, "gpio-sim,label", &label); if (ret) { label = devm_kasprintf(dev, GFP_KERNEL, "%s-%s", diff --git a/drivers/gpio/gpio-sl28cpld.c b/drivers/gpio/gpio-sl28cpld.c index 52404736ac861b..2195f88c204855 100644 --- a/drivers/gpio/gpio-sl28cpld.c +++ b/drivers/gpio/gpio-sl28cpld.c @@ -70,8 +70,7 @@ static int sl28cpld_gpio_irq_init(struct platform_device *pdev, irq_chip->num_irqs = ARRAY_SIZE(sl28cpld_gpio_irqs); irq_chip->num_regs = 1; irq_chip->status_base = base + GPIO_REG_IP; - irq_chip->mask_base = base + GPIO_REG_IE; - irq_chip->mask_invert = true; + irq_chip->unmask_base = base + GPIO_REG_IE; irq_chip->ack_base = base + GPIO_REG_IP; ret = devm_regmap_add_irq_chip_fwnode(dev, dev_fwnode(dev), diff --git a/drivers/gpio/gpio-sta2x11.c b/drivers/gpio/gpio-sta2x11.c deleted file mode 100644 index e07cca0f8d3538..00000000000000 --- a/drivers/gpio/gpio-sta2x11.c +++ /dev/null @@ -1,411 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0-only -/* - * STMicroelectronics ConneXt (STA2X11) GPIO driver - * - * Copyright 2012 ST Microelectronics (Alessandro Rubini) - * Based on gpio-ml-ioh.c, Copyright 2010 OKI Semiconductors Ltd. - * Also based on previous sta2x11 work, Copyright 2011 Wind River Systems, Inc. - */ - -#include <linux/init.h> -#include <linux/kernel.h> -#include <linux/slab.h> -#include <linux/gpio/driver.h> -#include <linux/bitops.h> -#include <linux/interrupt.h> -#include <linux/irq.h> -#include <linux/pci.h> -#include <linux/platform_device.h> -#include <linux/mfd/sta2x11-mfd.h> - -struct gsta_regs { - u32 dat; /* 0x00 */ - u32 dats; - u32 datc; - u32 pdis; - u32 dir; /* 0x10 */ - u32 dirs; - u32 dirc; - u32 unused_1c; - u32 afsela; /* 0x20 */ - u32 unused_24[7]; - u32 rimsc; /* 0x40 */ - u32 fimsc; - u32 is; - u32 ic; -}; - -struct gsta_gpio { - spinlock_t lock; - struct device *dev; - void __iomem *reg_base; - struct gsta_regs __iomem *regs[GSTA_NR_BLOCKS]; - struct gpio_chip gpio; - int irq_base; - /* FIXME: save the whole config here (AF, ...) */ - unsigned irq_type[GSTA_NR_GPIO]; -}; - -/* - * gpio methods - */ - -static void gsta_gpio_set(struct gpio_chip *gpio, unsigned nr, int val) -{ - struct gsta_gpio *chip = gpiochip_get_data(gpio); - struct gsta_regs __iomem *regs = chip->regs[nr / GSTA_GPIO_PER_BLOCK]; - u32 bit = BIT(nr % GSTA_GPIO_PER_BLOCK); - - if (val) - writel(bit, ®s->dats); - else - writel(bit, ®s->datc); -} - -static int gsta_gpio_get(struct gpio_chip *gpio, unsigned nr) -{ - struct gsta_gpio *chip = gpiochip_get_data(gpio); - struct gsta_regs __iomem *regs = chip->regs[nr / GSTA_GPIO_PER_BLOCK]; - u32 bit = BIT(nr % GSTA_GPIO_PER_BLOCK); - - return !!(readl(®s->dat) & bit); -} - -static int gsta_gpio_direction_output(struct gpio_chip *gpio, unsigned nr, - int val) -{ - struct gsta_gpio *chip = gpiochip_get_data(gpio); - struct gsta_regs __iomem *regs = chip->regs[nr / GSTA_GPIO_PER_BLOCK]; - u32 bit = BIT(nr % GSTA_GPIO_PER_BLOCK); - - writel(bit, ®s->dirs); - /* Data register after direction, otherwise pullup/down is selected */ - if (val) - writel(bit, ®s->dats); - else - writel(bit, ®s->datc); - return 0; -} - -static int gsta_gpio_direction_input(struct gpio_chip *gpio, unsigned nr) -{ - struct gsta_gpio *chip = gpiochip_get_data(gpio); - struct gsta_regs __iomem *regs = chip->regs[nr / GSTA_GPIO_PER_BLOCK]; - u32 bit = BIT(nr % GSTA_GPIO_PER_BLOCK); - - writel(bit, ®s->dirc); - return 0; -} - -static int gsta_gpio_to_irq(struct gpio_chip *gpio, unsigned offset) -{ - struct gsta_gpio *chip = gpiochip_get_data(gpio); - return chip->irq_base + offset; -} - -static void gsta_gpio_setup(struct gsta_gpio *chip) /* called from probe */ -{ - struct gpio_chip *gpio = &chip->gpio; - - /* - * ARCH_NR_GPIOS is currently 256 and dynamic allocation starts - * from the end. However, for compatibility, we need the first - * ConneXt device to start from gpio 0: it's the main chipset - * on most boards so documents and drivers assume gpio0..gpio127 - */ - static int gpio_base; - - gpio->label = dev_name(chip->dev); - gpio->owner = THIS_MODULE; - gpio->direction_input = gsta_gpio_direction_input; - gpio->get = gsta_gpio_get; - gpio->direction_output = gsta_gpio_direction_output; - gpio->set = gsta_gpio_set; - gpio->dbg_show = NULL; - gpio->base = gpio_base; - gpio->ngpio = GSTA_NR_GPIO; - gpio->can_sleep = false; - gpio->to_irq = gsta_gpio_to_irq; - - /* - * After the first device, turn to dynamic gpio numbers. - * For example, with ARCH_NR_GPIOS = 256 we can fit two cards - */ - if (!gpio_base) - gpio_base = -1; -} - -/* - * Special method: alternate functions and pullup/pulldown. This is only - * invoked on startup to configure gpio's according to platform data. - * FIXME : this functionality shall be managed (and exported to other drivers) - * via the pin control subsystem. - */ -static void gsta_set_config(struct gsta_gpio *chip, int nr, unsigned cfg) -{ - struct gsta_regs __iomem *regs = chip->regs[nr / GSTA_GPIO_PER_BLOCK]; - unsigned long flags; - u32 bit = BIT(nr % GSTA_GPIO_PER_BLOCK); - u32 val; - int err = 0; - - pr_info("%s: %p %i %i\n", __func__, chip, nr, cfg); - - if (cfg == PINMUX_TYPE_NONE) - return; - - /* Alternate function or not? */ - spin_lock_irqsave(&chip->lock, flags); - val = readl(®s->afsela); - if (cfg == PINMUX_TYPE_FUNCTION) - val |= bit; - else - val &= ~bit; - writel(val | bit, ®s->afsela); - if (cfg == PINMUX_TYPE_FUNCTION) { - spin_unlock_irqrestore(&chip->lock, flags); - return; - } - - /* not alternate function: set details */ - switch (cfg) { - case PINMUX_TYPE_OUTPUT_LOW: - writel(bit, ®s->dirs); - writel(bit, ®s->datc); - break; - case PINMUX_TYPE_OUTPUT_HIGH: - writel(bit, ®s->dirs); - writel(bit, ®s->dats); - break; - case PINMUX_TYPE_INPUT: - writel(bit, ®s->dirc); - val = readl(®s->pdis) | bit; - writel(val, ®s->pdis); - break; - case PINMUX_TYPE_INPUT_PULLUP: - writel(bit, ®s->dirc); - val = readl(®s->pdis) & ~bit; - writel(val, ®s->pdis); - writel(bit, ®s->dats); - break; - case PINMUX_TYPE_INPUT_PULLDOWN: - writel(bit, ®s->dirc); - val = readl(®s->pdis) & ~bit; - writel(val, ®s->pdis); - writel(bit, ®s->datc); - break; - default: - err = 1; - } - spin_unlock_irqrestore(&chip->lock, flags); - if (err) - pr_err("%s: chip %p, pin %i, cfg %i is invalid\n", - __func__, chip, nr, cfg); -} - -/* - * Irq methods - */ - -static void gsta_irq_disable(struct irq_data *data) -{ - struct irq_chip_generic *gc = irq_data_get_irq_chip_data(data); - struct gsta_gpio *chip = gc->private; - int nr = data->irq - chip->irq_base; - struct gsta_regs __iomem *regs = chip->regs[nr / GSTA_GPIO_PER_BLOCK]; - u32 bit = BIT(nr % GSTA_GPIO_PER_BLOCK); - u32 val; - unsigned long flags; - - spin_lock_irqsave(&chip->lock, flags); - if (chip->irq_type[nr] & IRQ_TYPE_EDGE_RISING) { - val = readl(®s->rimsc) & ~bit; - writel(val, ®s->rimsc); - } - if (chip->irq_type[nr] & IRQ_TYPE_EDGE_FALLING) { - val = readl(®s->fimsc) & ~bit; - writel(val, ®s->fimsc); - } - spin_unlock_irqrestore(&chip->lock, flags); - return; -} - -static void gsta_irq_enable(struct irq_data *data) -{ - struct irq_chip_generic *gc = irq_data_get_irq_chip_data(data); - struct gsta_gpio *chip = gc->private; - int nr = data->irq - chip->irq_base; - struct gsta_regs __iomem *regs = chip->regs[nr / GSTA_GPIO_PER_BLOCK]; - u32 bit = BIT(nr % GSTA_GPIO_PER_BLOCK); - u32 val; - int type; - unsigned long flags; - - type = chip->irq_type[nr]; - - spin_lock_irqsave(&chip->lock, flags); - val = readl(®s->rimsc); - if (type & IRQ_TYPE_EDGE_RISING) - writel(val | bit, ®s->rimsc); - else - writel(val & ~bit, ®s->rimsc); - val = readl(®s->rimsc); - if (type & IRQ_TYPE_EDGE_FALLING) - writel(val | bit, ®s->fimsc); - else - writel(val & ~bit, ®s->fimsc); - spin_unlock_irqrestore(&chip->lock, flags); - return; -} - -static int gsta_irq_type(struct irq_data *d, unsigned int type) -{ - struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d); - struct gsta_gpio *chip = gc->private; - int nr = d->irq - chip->irq_base; - - /* We only support edge interrupts */ - if (!(type & (IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING))) { - pr_debug("%s: unsupported type 0x%x\n", __func__, type); - return -EINVAL; - } - - chip->irq_type[nr] = type; /* used for enable/disable */ - - gsta_irq_enable(d); - return 0; -} - -static irqreturn_t gsta_gpio_handler(int irq, void *dev_id) -{ - struct gsta_gpio *chip = dev_id; - struct gsta_regs __iomem *regs; - u32 is; - int i, nr, base; - irqreturn_t ret = IRQ_NONE; - - for (i = 0; i < GSTA_NR_BLOCKS; i++) { - regs = chip->regs[i]; - base = chip->irq_base + i * GSTA_GPIO_PER_BLOCK; - while ((is = readl(®s->is))) { - nr = __ffs(is); - irq = base + nr; - generic_handle_irq(irq); - writel(1 << nr, ®s->ic); - ret = IRQ_HANDLED; - } - } - return ret; -} - -static int gsta_alloc_irq_chip(struct gsta_gpio *chip) -{ - struct irq_chip_generic *gc; - struct irq_chip_type *ct; - int rv; - - gc = devm_irq_alloc_generic_chip(chip->dev, KBUILD_MODNAME, 1, - chip->irq_base, - chip->reg_base, handle_simple_irq); - if (!gc) - return -ENOMEM; - - gc->private = chip; - ct = gc->chip_types; - - ct->chip.irq_set_type = gsta_irq_type; - ct->chip.irq_disable = gsta_irq_disable; - ct->chip.irq_enable = gsta_irq_enable; - - /* FIXME: this makes at most 32 interrupts. Request 0 by now */ - rv = devm_irq_setup_generic_chip(chip->dev, gc, - 0 /* IRQ_MSK(GSTA_GPIO_PER_BLOCK) */, - 0, IRQ_NOREQUEST | IRQ_NOPROBE, 0); - if (rv) - return rv; - - /* Set up all 128 interrupts: code from setup_generic_chip */ - { - struct irq_chip_type *ct = gc->chip_types; - int i, j; - for (j = 0; j < GSTA_NR_GPIO; j++) { - i = chip->irq_base + j; - irq_set_chip_and_handler(i, &ct->chip, ct->handler); - irq_set_chip_data(i, gc); - irq_clear_status_flags(i, IRQ_NOREQUEST | IRQ_NOPROBE); - } - gc->irq_cnt = i - gc->irq_base; - } - - return 0; -} - -/* The platform device used here is instantiated by the MFD device */ -static int gsta_probe(struct platform_device *dev) -{ - int i, err; - struct pci_dev *pdev; - struct sta2x11_gpio_pdata *gpio_pdata; - struct gsta_gpio *chip; - - pdev = *(struct pci_dev **)dev_get_platdata(&dev->dev); - gpio_pdata = dev_get_platdata(&pdev->dev); - - if (gpio_pdata == NULL) - dev_err(&dev->dev, "no gpio config\n"); - pr_debug("gpio config: %p\n", gpio_pdata); - - chip = devm_kzalloc(&dev->dev, sizeof(*chip), GFP_KERNEL); - if (!chip) - return -ENOMEM; - chip->dev = &dev->dev; - chip->reg_base = devm_platform_ioremap_resource(dev, 0); - if (IS_ERR(chip->reg_base)) - return PTR_ERR(chip->reg_base); - - for (i = 0; i < GSTA_NR_BLOCKS; i++) { - chip->regs[i] = chip->reg_base + i * 4096; - /* disable all irqs */ - writel(0, &chip->regs[i]->rimsc); - writel(0, &chip->regs[i]->fimsc); - writel(~0, &chip->regs[i]->ic); - } - spin_lock_init(&chip->lock); - gsta_gpio_setup(chip); - if (gpio_pdata) - for (i = 0; i < GSTA_NR_GPIO; i++) - gsta_set_config(chip, i, gpio_pdata->pinconfig[i]); - - /* 384 was used in previous code: be compatible for other drivers */ - err = devm_irq_alloc_descs(&dev->dev, -1, 384, - GSTA_NR_GPIO, NUMA_NO_NODE); - if (err < 0) { - dev_warn(&dev->dev, "sta2x11 gpio: Can't get irq base (%i)\n", - -err); - return err; - } - chip->irq_base = err; - - err = gsta_alloc_irq_chip(chip); - if (err) - return err; - - err = devm_request_irq(&dev->dev, pdev->irq, gsta_gpio_handler, - IRQF_SHARED, KBUILD_MODNAME, chip); - if (err < 0) { - dev_err(&dev->dev, "sta2x11 gpio: Can't request irq (%i)\n", - -err); - return err; - } - - return devm_gpiochip_add_data(&dev->dev, &chip->gpio, chip); -} - -static struct platform_driver sta2x11_gpio_platform_driver = { - .driver = { - .name = "sta2x11-gpio", - .suppress_bind_attrs = true, - }, - .probe = gsta_probe, -}; -builtin_platform_driver(sta2x11_gpio_platform_driver); diff --git a/drivers/gpio/gpio-tpic2810.c b/drivers/gpio/gpio-tpic2810.c index d642c35cb97c0c..349c5fbd9b0274 100644 --- a/drivers/gpio/gpio-tpic2810.c +++ b/drivers/gpio/gpio-tpic2810.c @@ -98,8 +98,7 @@ static const struct of_device_id tpic2810_of_match_table[] = { }; MODULE_DEVICE_TABLE(of, tpic2810_of_match_table); -static int tpic2810_probe(struct i2c_client *client, - const struct i2c_device_id *id) +static int tpic2810_probe(struct i2c_client *client) { struct tpic2810 *gpio; int ret; @@ -144,7 +143,7 @@ static struct i2c_driver tpic2810_driver = { .name = "tpic2810", .of_match_table = tpic2810_of_match_table, }, - .probe = tpic2810_probe, + .probe_new = tpic2810_probe, .remove = tpic2810_remove, .id_table = tpic2810_id_table, }; diff --git a/drivers/gpio/gpio-ts4900.c b/drivers/gpio/gpio-ts4900.c index 416725c26e949e..43e8b66e04f781 100644 --- a/drivers/gpio/gpio-ts4900.c +++ b/drivers/gpio/gpio-ts4900.c @@ -136,8 +136,7 @@ static const struct of_device_id ts4900_gpio_of_match_table[] = { }; MODULE_DEVICE_TABLE(of, ts4900_gpio_of_match_table); -static int ts4900_gpio_probe(struct i2c_client *client, - const struct i2c_device_id *id) +static int ts4900_gpio_probe(struct i2c_client *client) { struct ts4900_gpio_priv *priv; u32 ngpio; @@ -186,7 +185,7 @@ static struct i2c_driver ts4900_gpio_driver = { .name = "ts4900-gpio", .of_match_table = ts4900_gpio_of_match_table, }, - .probe = ts4900_gpio_probe, + .probe_new = ts4900_gpio_probe, .id_table = ts4900_gpio_id_table, }; module_i2c_driver(ts4900_gpio_driver); diff --git a/drivers/gpio/gpiolib-acpi.c b/drivers/gpio/gpiolib-acpi.c index a7d2358736fe76..bed0380c51360a 100644 --- a/drivers/gpio/gpiolib-acpi.c +++ b/drivers/gpio/gpiolib-acpi.c @@ -89,6 +89,30 @@ struct acpi_gpio_chip { struct list_head deferred_req_irqs_list_entry; }; +/** + * struct acpi_gpio_info - ACPI GPIO specific information + * @adev: reference to ACPI device which consumes GPIO resource + * @flags: GPIO initialization flags + * @gpioint: if %true this GPIO is of type GpioInt otherwise type is GpioIo + * @pin_config: pin bias as provided by ACPI + * @polarity: interrupt polarity as provided by ACPI + * @triggering: triggering type as provided by ACPI + * @wake_capable: wake capability as provided by ACPI + * @debounce: debounce timeout as provided by ACPI + * @quirks: Linux specific quirks as provided by struct acpi_gpio_mapping + */ +struct acpi_gpio_info { + struct acpi_device *adev; + enum gpiod_flags flags; + bool gpioint; + int pin_config; + int polarity; + int triggering; + bool wake_capable; + unsigned int debounce; + unsigned int quirks; +}; + /* * For GPIO chips which call acpi_gpiochip_request_interrupts() before late_init * (so builtin drivers) we register the ACPI GpioInt IRQ handlers from a @@ -512,7 +536,7 @@ void acpi_gpiochip_request_interrupts(struct gpio_chip *chip) if (ACPI_FAILURE(status)) return; - acpi_walk_resources(handle, "_AEI", + acpi_walk_resources(handle, METHOD_NAME__AEI, acpi_gpiochip_alloc_event, acpi_gpio); mutex_lock(&acpi_gpio_deferred_req_irqs_lock); @@ -670,8 +694,8 @@ __acpi_gpio_update_gpiod_flags(enum gpiod_flags *flags, enum gpiod_flags update) return ret; } -int -acpi_gpio_update_gpiod_flags(enum gpiod_flags *flags, struct acpi_gpio_info *info) +static int acpi_gpio_update_gpiod_flags(enum gpiod_flags *flags, + struct acpi_gpio_info *info) { struct device *dev = &info->adev->dev; enum gpiod_flags old = *flags; @@ -690,8 +714,8 @@ acpi_gpio_update_gpiod_flags(enum gpiod_flags *flags, struct acpi_gpio_info *inf return ret; } -int acpi_gpio_update_gpiod_lookup_flags(unsigned long *lookupflags, - struct acpi_gpio_info *info) +static int acpi_gpio_update_gpiod_lookup_flags(unsigned long *lookupflags, + struct acpi_gpio_info *info) { switch (info->pin_config) { case ACPI_PIN_CONFIG_PULLUP: @@ -864,8 +888,9 @@ static int acpi_gpio_property_lookup(struct fwnode_handle *fwnode, * function only returns the first. */ static struct gpio_desc *acpi_get_gpiod_by_index(struct acpi_device *adev, - const char *propname, int index, - struct acpi_gpio_info *info) + const char *propname, + int index, + struct acpi_gpio_info *info) { struct acpi_gpio_lookup lookup; int ret; @@ -896,6 +921,44 @@ static struct gpio_desc *acpi_get_gpiod_by_index(struct acpi_device *adev, return ret ? ERR_PTR(ret) : lookup.desc; } +/** + * acpi_get_gpiod_from_data() - get a GPIO descriptor from ACPI data node + * @fwnode: pointer to an ACPI firmware node to get the GPIO information from + * @propname: Property name of the GPIO + * @index: index of GpioIo/GpioInt resource (starting from %0) + * @info: info pointer to fill in (optional) + * + * This function uses the property-based GPIO lookup to get to the GPIO + * resource with the relevant information from a data-only ACPI firmware node + * and uses that to obtain the GPIO descriptor to return. + * + * If the GPIO cannot be translated or there is an error an ERR_PTR is + * returned. + */ +static struct gpio_desc *acpi_get_gpiod_from_data(struct fwnode_handle *fwnode, + const char *propname, + int index, + struct acpi_gpio_info *info) +{ + struct acpi_gpio_lookup lookup; + int ret; + + if (!is_acpi_data_node(fwnode)) + return ERR_PTR(-ENODEV); + + if (!propname) + return ERR_PTR(-EINVAL); + + lookup.index = index; + + ret = acpi_gpio_property_lookup(fwnode, propname, index, &lookup); + if (ret) + return ERR_PTR(ret); + + ret = acpi_gpio_resource_lookup(&lookup, info); + return ret ? ERR_PTR(ret) : lookup.desc; +} + static bool acpi_can_fallback_to_crs(struct acpi_device *adev, const char *con_id) { @@ -906,13 +969,13 @@ static bool acpi_can_fallback_to_crs(struct acpi_device *adev, return con_id == NULL; } -struct gpio_desc *acpi_find_gpio(struct device *dev, +struct gpio_desc *acpi_find_gpio(struct fwnode_handle *fwnode, const char *con_id, unsigned int idx, enum gpiod_flags *dflags, unsigned long *lookupflags) { - struct acpi_device *adev = ACPI_COMPANION(dev); + struct acpi_device *adev = to_acpi_device_node(fwnode); struct acpi_gpio_info info; struct gpio_desc *desc; char propname[32]; @@ -928,7 +991,12 @@ struct gpio_desc *acpi_find_gpio(struct device *dev, gpio_suffixes[i]); } - desc = acpi_get_gpiod_by_index(adev, propname, idx, &info); + if (adev) + desc = acpi_get_gpiod_by_index(adev, + propname, idx, &info); + else + desc = acpi_get_gpiod_from_data(fwnode, + propname, idx, &info); if (!IS_ERR(desc)) break; if (PTR_ERR(desc) == -EPROBE_DEFER) @@ -937,7 +1005,7 @@ struct gpio_desc *acpi_find_gpio(struct device *dev, /* Then from plain _CRS GPIOs */ if (IS_ERR(desc)) { - if (!acpi_can_fallback_to_crs(adev, con_id)) + if (!adev || !acpi_can_fallback_to_crs(adev, con_id)) return ERR_PTR(-ENOENT); desc = acpi_get_gpiod_by_index(adev, NULL, idx, &info); @@ -957,50 +1025,6 @@ struct gpio_desc *acpi_find_gpio(struct device *dev, } /** - * acpi_node_get_gpiod() - get a GPIO descriptor from ACPI resources - * @fwnode: pointer to an ACPI firmware node to get the GPIO information from - * @propname: Property name of the GPIO - * @index: index of GpioIo/GpioInt resource (starting from %0) - * @info: info pointer to fill in (optional) - * - * If @fwnode is an ACPI device object, call acpi_get_gpiod_by_index() for it. - * Otherwise (i.e. it is a data-only non-device object), use the property-based - * GPIO lookup to get to the GPIO resource with the relevant information and use - * that to obtain the GPIO descriptor to return. - * - * If the GPIO cannot be translated or there is an error an ERR_PTR is - * returned. - */ -struct gpio_desc *acpi_node_get_gpiod(struct fwnode_handle *fwnode, - const char *propname, int index, - struct acpi_gpio_info *info) -{ - struct acpi_gpio_lookup lookup; - struct acpi_device *adev; - int ret; - - adev = to_acpi_device_node(fwnode); - if (adev) - return acpi_get_gpiod_by_index(adev, propname, index, info); - - if (!is_acpi_data_node(fwnode)) - return ERR_PTR(-ENODEV); - - if (!propname) - return ERR_PTR(-EINVAL); - - memset(&lookup, 0, sizeof(lookup)); - lookup.index = index; - - ret = acpi_gpio_property_lookup(fwnode, propname, index, &lookup); - if (ret) - return ERR_PTR(ret); - - ret = acpi_gpio_resource_lookup(&lookup, info); - return ret ? ERR_PTR(ret) : lookup.desc; -} - -/** * acpi_dev_gpio_irq_wake_get_by() - Find GpioInt and translate it to Linux IRQ number * @adev: pointer to a ACPI device to get IRQ from * @name: optional name of GpioInt resource diff --git a/drivers/gpio/gpiolib-acpi.h b/drivers/gpio/gpiolib-acpi.h index 01e0cb480a00cf..9475f99a969414 100644 --- a/drivers/gpio/gpiolib-acpi.h +++ b/drivers/gpio/gpiolib-acpi.h @@ -22,30 +22,6 @@ struct gpio_chip; struct gpio_desc; struct gpio_device; -/** - * struct acpi_gpio_info - ACPI GPIO specific information - * @adev: reference to ACPI device which consumes GPIO resource - * @flags: GPIO initialization flags - * @gpioint: if %true this GPIO is of type GpioInt otherwise type is GpioIo - * @pin_config: pin bias as provided by ACPI - * @polarity: interrupt polarity as provided by ACPI - * @triggering: triggering type as provided by ACPI - * @wake_capable: wake capability as provided by ACPI - * @debounce: debounce timeout as provided by ACPI - * @quirks: Linux specific quirks as provided by struct acpi_gpio_mapping - */ -struct acpi_gpio_info { - struct acpi_device *adev; - enum gpiod_flags flags; - bool gpioint; - int pin_config; - int polarity; - int triggering; - bool wake_capable; - unsigned int debounce; - unsigned int quirks; -}; - #ifdef CONFIG_ACPI void acpi_gpiochip_add(struct gpio_chip *chip); void acpi_gpiochip_remove(struct gpio_chip *chip); @@ -55,19 +31,11 @@ void acpi_gpio_dev_init(struct gpio_chip *gc, struct gpio_device *gdev); void acpi_gpiochip_request_interrupts(struct gpio_chip *chip); void acpi_gpiochip_free_interrupts(struct gpio_chip *chip); -int acpi_gpio_update_gpiod_flags(enum gpiod_flags *flags, - struct acpi_gpio_info *info); -int acpi_gpio_update_gpiod_lookup_flags(unsigned long *lookupflags, - struct acpi_gpio_info *info); - -struct gpio_desc *acpi_find_gpio(struct device *dev, +struct gpio_desc *acpi_find_gpio(struct fwnode_handle *fwnode, const char *con_id, unsigned int idx, enum gpiod_flags *dflags, unsigned long *lookupflags); -struct gpio_desc *acpi_node_get_gpiod(struct fwnode_handle *fwnode, - const char *propname, int index, - struct acpi_gpio_info *info); int acpi_gpio_count(struct device *dev, const char *con_id); #else @@ -82,31 +50,13 @@ acpi_gpiochip_request_interrupts(struct gpio_chip *chip) { } static inline void acpi_gpiochip_free_interrupts(struct gpio_chip *chip) { } -static inline int -acpi_gpio_update_gpiod_flags(enum gpiod_flags *flags, struct acpi_gpio_info *info) -{ - return 0; -} -static inline int -acpi_gpio_update_gpiod_lookup_flags(unsigned long *lookupflags, - struct acpi_gpio_info *info) -{ - return 0; -} - static inline struct gpio_desc * -acpi_find_gpio(struct device *dev, const char *con_id, +acpi_find_gpio(struct fwnode_handle *fwnode, const char *con_id, unsigned int idx, enum gpiod_flags *dflags, unsigned long *lookupflags) { return ERR_PTR(-ENOENT); } -static inline struct gpio_desc * -acpi_node_get_gpiod(struct fwnode_handle *fwnode, const char *propname, - int index, struct acpi_gpio_info *info) -{ - return ERR_PTR(-ENXIO); -} static inline int acpi_gpio_count(struct device *dev, const char *con_id) { return -ENODEV; diff --git a/drivers/gpio/gpiolib-cdev.c b/drivers/gpio/gpiolib-cdev.c index 65b2c09a4576a1..e878e3f22b0e48 100644 --- a/drivers/gpio/gpiolib-cdev.c +++ b/drivers/gpio/gpiolib-cdev.c @@ -57,6 +57,50 @@ static_assert(IS_ALIGNED(sizeof(struct gpio_v2_line_values), 8)); * interface to gpiolib GPIOs via ioctl()s. */ +typedef __poll_t (*poll_fn)(struct file *, struct poll_table_struct *); +typedef long (*ioctl_fn)(struct file *, unsigned int, unsigned long); +typedef ssize_t (*read_fn)(struct file *, char __user *, + size_t count, loff_t *); + +static __poll_t call_poll_locked(struct file *file, + struct poll_table_struct *wait, + struct gpio_device *gdev, poll_fn func) +{ + __poll_t ret; + + down_read(&gdev->sem); + ret = func(file, wait); + up_read(&gdev->sem); + + return ret; +} + +static long call_ioctl_locked(struct file *file, unsigned int cmd, + unsigned long arg, struct gpio_device *gdev, + ioctl_fn func) +{ + long ret; + + down_read(&gdev->sem); + ret = func(file, cmd, arg); + up_read(&gdev->sem); + + return ret; +} + +static ssize_t call_read_locked(struct file *file, char __user *buf, + size_t count, loff_t *f_ps, + struct gpio_device *gdev, read_fn func) +{ + ssize_t ret; + + down_read(&gdev->sem); + ret = func(file, buf, count, f_ps); + up_read(&gdev->sem); + + return ret; +} + /* * GPIO line handle management */ @@ -193,8 +237,8 @@ static long linehandle_set_config(struct linehandle_state *lh, return 0; } -static long linehandle_ioctl(struct file *file, unsigned int cmd, - unsigned long arg) +static long linehandle_ioctl_unlocked(struct file *file, unsigned int cmd, + unsigned long arg) { struct linehandle_state *lh = file->private_data; void __user *ip = (void __user *)arg; @@ -203,6 +247,9 @@ static long linehandle_ioctl(struct file *file, unsigned int cmd, unsigned int i; int ret; + if (!lh->gdev->chip) + return -ENODEV; + switch (cmd) { case GPIOHANDLE_GET_LINE_VALUES_IOCTL: /* NOTE: It's okay to read values of output lines */ @@ -249,6 +296,15 @@ static long linehandle_ioctl(struct file *file, unsigned int cmd, } } +static long linehandle_ioctl(struct file *file, unsigned int cmd, + unsigned long arg) +{ + struct linehandle_state *lh = file->private_data; + + return call_ioctl_locked(file, cmd, arg, lh->gdev, + linehandle_ioctl_unlocked); +} + #ifdef CONFIG_COMPAT static long linehandle_ioctl_compat(struct file *file, unsigned int cmd, unsigned long arg) @@ -412,7 +468,7 @@ out_free_lh: * @desc: the GPIO descriptor for this line. * @req: the corresponding line request * @irq: the interrupt triggered in response to events on this GPIO - * @eflags: the edge flags, GPIO_V2_LINE_FLAG_EDGE_RISING and/or + * @edflags: the edge flags, GPIO_V2_LINE_FLAG_EDGE_RISING and/or * GPIO_V2_LINE_FLAG_EDGE_FALLING, indicating the edge detection applied * @timestamp_ns: cache for the timestamp storing it between hardirq and * IRQ thread, used to bring the timestamp close to the actual event @@ -1380,12 +1436,15 @@ static long linereq_set_config(struct linereq *lr, void __user *ip) return ret; } -static long linereq_ioctl(struct file *file, unsigned int cmd, - unsigned long arg) +static long linereq_ioctl_unlocked(struct file *file, unsigned int cmd, + unsigned long arg) { struct linereq *lr = file->private_data; void __user *ip = (void __user *)arg; + if (!lr->gdev->chip) + return -ENODEV; + switch (cmd) { case GPIO_V2_LINE_GET_VALUES_IOCTL: return linereq_get_values(lr, ip); @@ -1398,6 +1457,15 @@ static long linereq_ioctl(struct file *file, unsigned int cmd, } } +static long linereq_ioctl(struct file *file, unsigned int cmd, + unsigned long arg) +{ + struct linereq *lr = file->private_data; + + return call_ioctl_locked(file, cmd, arg, lr->gdev, + linereq_ioctl_unlocked); +} + #ifdef CONFIG_COMPAT static long linereq_ioctl_compat(struct file *file, unsigned int cmd, unsigned long arg) @@ -1406,12 +1474,15 @@ static long linereq_ioctl_compat(struct file *file, unsigned int cmd, } #endif -static __poll_t linereq_poll(struct file *file, - struct poll_table_struct *wait) +static __poll_t linereq_poll_unlocked(struct file *file, + struct poll_table_struct *wait) { struct linereq *lr = file->private_data; __poll_t events = 0; + if (!lr->gdev->chip) + return EPOLLHUP | EPOLLERR; + poll_wait(file, &lr->wait, wait); if (!kfifo_is_empty_spinlocked_noirqsave(&lr->events, @@ -1421,16 +1492,25 @@ static __poll_t linereq_poll(struct file *file, return events; } -static ssize_t linereq_read(struct file *file, - char __user *buf, - size_t count, - loff_t *f_ps) +static __poll_t linereq_poll(struct file *file, + struct poll_table_struct *wait) +{ + struct linereq *lr = file->private_data; + + return call_poll_locked(file, wait, lr->gdev, linereq_poll_unlocked); +} + +static ssize_t linereq_read_unlocked(struct file *file, char __user *buf, + size_t count, loff_t *f_ps) { struct linereq *lr = file->private_data; struct gpio_v2_line_event le; ssize_t bytes_read = 0; int ret; + if (!lr->gdev->chip) + return -ENODEV; + if (count < sizeof(le)) return -EINVAL; @@ -1475,6 +1555,15 @@ static ssize_t linereq_read(struct file *file, return bytes_read; } +static ssize_t linereq_read(struct file *file, char __user *buf, + size_t count, loff_t *f_ps) +{ + struct linereq *lr = file->private_data; + + return call_read_locked(file, buf, count, f_ps, lr->gdev, + linereq_read_unlocked); +} + static void linereq_free(struct linereq *lr) { unsigned int i; @@ -1712,12 +1801,15 @@ struct lineevent_state { (GPIOEVENT_REQUEST_RISING_EDGE | \ GPIOEVENT_REQUEST_FALLING_EDGE) -static __poll_t lineevent_poll(struct file *file, - struct poll_table_struct *wait) +static __poll_t lineevent_poll_unlocked(struct file *file, + struct poll_table_struct *wait) { struct lineevent_state *le = file->private_data; __poll_t events = 0; + if (!le->gdev->chip) + return EPOLLHUP | EPOLLERR; + poll_wait(file, &le->wait, wait); if (!kfifo_is_empty_spinlocked_noirqsave(&le->events, &le->wait.lock)) @@ -1726,15 +1818,21 @@ static __poll_t lineevent_poll(struct file *file, return events; } +static __poll_t lineevent_poll(struct file *file, + struct poll_table_struct *wait) +{ + struct lineevent_state *le = file->private_data; + + return call_poll_locked(file, wait, le->gdev, lineevent_poll_unlocked); +} + struct compat_gpioeevent_data { compat_u64 timestamp; u32 id; }; -static ssize_t lineevent_read(struct file *file, - char __user *buf, - size_t count, - loff_t *f_ps) +static ssize_t lineevent_read_unlocked(struct file *file, char __user *buf, + size_t count, loff_t *f_ps) { struct lineevent_state *le = file->private_data; struct gpioevent_data ge; @@ -1742,6 +1840,9 @@ static ssize_t lineevent_read(struct file *file, ssize_t ge_size; int ret; + if (!le->gdev->chip) + return -ENODEV; + /* * When compatible system call is being used the struct gpioevent_data, * in case of at least ia32, has different size due to the alignment @@ -1799,6 +1900,15 @@ static ssize_t lineevent_read(struct file *file, return bytes_read; } +static ssize_t lineevent_read(struct file *file, char __user *buf, + size_t count, loff_t *f_ps) +{ + struct lineevent_state *le = file->private_data; + + return call_read_locked(file, buf, count, f_ps, le->gdev, + lineevent_read_unlocked); +} + static void lineevent_free(struct lineevent_state *le) { if (le->irq) @@ -1816,13 +1926,16 @@ static int lineevent_release(struct inode *inode, struct file *file) return 0; } -static long lineevent_ioctl(struct file *file, unsigned int cmd, - unsigned long arg) +static long lineevent_ioctl_unlocked(struct file *file, unsigned int cmd, + unsigned long arg) { struct lineevent_state *le = file->private_data; void __user *ip = (void __user *)arg; struct gpiohandle_data ghd; + if (!le->gdev->chip) + return -ENODEV; + /* * We can get the value for an event line but not set it, * because it is input by definition. @@ -1845,6 +1958,15 @@ static long lineevent_ioctl(struct file *file, unsigned int cmd, return -EINVAL; } +static long lineevent_ioctl(struct file *file, unsigned int cmd, + unsigned long arg) +{ + struct lineevent_state *le = file->private_data; + + return call_ioctl_locked(file, cmd, arg, le->gdev, + lineevent_ioctl_unlocked); +} + #ifdef CONFIG_COMPAT static long lineevent_ioctl_compat(struct file *file, unsigned int cmd, unsigned long arg) @@ -2403,12 +2525,15 @@ static int lineinfo_changed_notify(struct notifier_block *nb, return NOTIFY_OK; } -static __poll_t lineinfo_watch_poll(struct file *file, - struct poll_table_struct *pollt) +static __poll_t lineinfo_watch_poll_unlocked(struct file *file, + struct poll_table_struct *pollt) { struct gpio_chardev_data *cdev = file->private_data; __poll_t events = 0; + if (!cdev->gdev->chip) + return EPOLLHUP | EPOLLERR; + poll_wait(file, &cdev->wait, pollt); if (!kfifo_is_empty_spinlocked_noirqsave(&cdev->events, @@ -2418,8 +2543,17 @@ static __poll_t lineinfo_watch_poll(struct file *file, return events; } -static ssize_t lineinfo_watch_read(struct file *file, char __user *buf, - size_t count, loff_t *off) +static __poll_t lineinfo_watch_poll(struct file *file, + struct poll_table_struct *pollt) +{ + struct gpio_chardev_data *cdev = file->private_data; + + return call_poll_locked(file, pollt, cdev->gdev, + lineinfo_watch_poll_unlocked); +} + +static ssize_t lineinfo_watch_read_unlocked(struct file *file, char __user *buf, + size_t count, loff_t *off) { struct gpio_chardev_data *cdev = file->private_data; struct gpio_v2_line_info_changed event; @@ -2427,6 +2561,9 @@ static ssize_t lineinfo_watch_read(struct file *file, char __user *buf, int ret; size_t event_size; + if (!cdev->gdev->chip) + return -ENODEV; + #ifndef CONFIG_GPIO_CDEV_V1 event_size = sizeof(struct gpio_v2_line_info_changed); if (count < event_size) @@ -2494,6 +2631,15 @@ static ssize_t lineinfo_watch_read(struct file *file, char __user *buf, return bytes_read; } +static ssize_t lineinfo_watch_read(struct file *file, char __user *buf, + size_t count, loff_t *off) +{ + struct gpio_chardev_data *cdev = file->private_data; + + return call_read_locked(file, buf, count, off, cdev->gdev, + lineinfo_watch_read_unlocked); +} + /** * gpio_chrdev_open() - open the chardev for ioctl operations * @inode: inode for this chardev @@ -2507,13 +2653,17 @@ static int gpio_chrdev_open(struct inode *inode, struct file *file) struct gpio_chardev_data *cdev; int ret = -ENOMEM; + down_read(&gdev->sem); + /* Fail on open if the backing gpiochip is gone */ - if (!gdev->chip) - return -ENODEV; + if (!gdev->chip) { + ret = -ENODEV; + goto out_unlock; + } cdev = kzalloc(sizeof(*cdev), GFP_KERNEL); if (!cdev) - return -ENOMEM; + goto out_unlock; cdev->watched_lines = bitmap_zalloc(gdev->chip->ngpio, GFP_KERNEL); if (!cdev->watched_lines) @@ -2536,6 +2686,8 @@ static int gpio_chrdev_open(struct inode *inode, struct file *file) if (ret) goto out_unregister_notifier; + up_read(&gdev->sem); + return ret; out_unregister_notifier: @@ -2545,6 +2697,8 @@ out_free_bitmap: bitmap_free(cdev->watched_lines); out_free_cdev: kfree(cdev); +out_unlock: + up_read(&gdev->sem); return ret; } diff --git a/drivers/gpio/gpiolib-of.c b/drivers/gpio/gpiolib-of.c index 0e4e1291604d67..4fff7258ee41a6 100644 --- a/drivers/gpio/gpiolib-of.c +++ b/drivers/gpio/gpiolib-of.c @@ -85,7 +85,7 @@ static int of_gpiochip_match_node_and_xlate(struct gpio_chip *chip, void *data) { struct of_phandle_args *gpiospec = data; - return chip->gpiodev->dev.of_node == gpiospec->np && + return device_match_of_node(&chip->gpiodev->dev, gpiospec->np) && chip->of_xlate && chip->of_xlate(chip, gpiospec, NULL) >= 0; } @@ -112,55 +112,133 @@ static struct gpio_desc *of_xlate_and_get_gpiod_flags(struct gpio_chip *chip, return gpiochip_get_desc(chip, ret); } -/** - * of_gpio_need_valid_mask() - figure out if the OF GPIO driver needs - * to set the .valid_mask - * @gc: the target gpio_chip - * - * Return: true if the valid mask needs to be set +/* + * Overrides stated polarity of a gpio line and warns when there is a + * discrepancy. */ -bool of_gpio_need_valid_mask(const struct gpio_chip *gc) +static void of_gpio_quirk_polarity(const struct device_node *np, + bool active_high, + enum of_gpio_flags *flags) { - int size; - const struct device_node *np = gc->of_node; + if (active_high) { + if (*flags & OF_GPIO_ACTIVE_LOW) { + pr_warn("%s GPIO handle specifies active low - ignored\n", + of_node_full_name(np)); + *flags &= ~OF_GPIO_ACTIVE_LOW; + } + } else { + if (!(*flags & OF_GPIO_ACTIVE_LOW)) + pr_info("%s enforce active low on GPIO handle\n", + of_node_full_name(np)); + *flags |= OF_GPIO_ACTIVE_LOW; + } +} - size = of_property_count_u32_elems(np, "gpio-reserved-ranges"); - if (size > 0 && size % 2 == 0) - return true; - return false; +/* + * This quirk does static polarity overrides in cases where existing + * DTS specified incorrect polarity. + */ +static void of_gpio_try_fixup_polarity(const struct device_node *np, + const char *propname, + enum of_gpio_flags *flags) +{ + static const struct { + const char *compatible; + const char *propname; + bool active_high; + } gpios[] = { +#if !IS_ENABLED(CONFIG_LCD_HX8357) + /* + * Himax LCD controllers used incorrectly named + * "gpios-reset" property and also specified wrong + * polarity. + */ + { "himax,hx8357", "gpios-reset", false }, + { "himax,hx8369", "gpios-reset", false }, +#endif + }; + unsigned int i; + + for (i = 0; i < ARRAY_SIZE(gpios); i++) { + if (of_device_is_compatible(np, gpios[i].compatible) && + !strcmp(propname, gpios[i].propname)) { + of_gpio_quirk_polarity(np, gpios[i].active_high, flags); + break; + } + } } -static void of_gpio_flags_quirks(const struct device_node *np, - const char *propname, - enum of_gpio_flags *flags, - int index) +static void of_gpio_set_polarity_by_property(const struct device_node *np, + const char *propname, + enum of_gpio_flags *flags) { - /* - * Some GPIO fixed regulator quirks. - * Note that active low is the default. - */ - if (IS_ENABLED(CONFIG_REGULATOR) && - (of_device_is_compatible(np, "regulator-fixed") || - of_device_is_compatible(np, "reg-fixed-voltage") || - (!(strcmp(propname, "enable-gpio") && - strcmp(propname, "enable-gpios")) && - of_device_is_compatible(np, "regulator-gpio")))) { - bool active_low = !of_property_read_bool(np, - "enable-active-high"); + static const struct { + const char *compatible; + const char *gpio_propname; + const char *polarity_propname; + } gpios[] = { +#if IS_ENABLED(CONFIG_FEC) + /* Freescale Fast Ethernet Controller */ + { "fsl,imx25-fec", "phy-reset-gpios", "phy-reset-active-high" }, + { "fsl,imx27-fec", "phy-reset-gpios", "phy-reset-active-high" }, + { "fsl,imx28-fec", "phy-reset-gpios", "phy-reset-active-high" }, + { "fsl,imx6q-fec", "phy-reset-gpios", "phy-reset-active-high" }, + { "fsl,mvf600-fec", "phy-reset-gpios", "phy-reset-active-high" }, + { "fsl,imx6sx-fec", "phy-reset-gpios", "phy-reset-active-high" }, + { "fsl,imx6ul-fec", "phy-reset-gpios", "phy-reset-active-high" }, + { "fsl,imx8mq-fec", "phy-reset-gpios", "phy-reset-active-high" }, + { "fsl,imx8qm-fec", "phy-reset-gpios", "phy-reset-active-high" }, + { "fsl,s32v234-fec", "phy-reset-gpios", "phy-reset-active-high" }, +#endif +#if IS_ENABLED(CONFIG_PCI_IMX6) + { "fsl,imx6q-pcie", "reset-gpio", "reset-gpio-active-high" }, + { "fsl,imx6sx-pcie", "reset-gpio", "reset-gpio-active-high" }, + { "fsl,imx6qp-pcie", "reset-gpio", "reset-gpio-active-high" }, + { "fsl,imx7d-pcie", "reset-gpio", "reset-gpio-active-high" }, + { "fsl,imx8mq-pcie", "reset-gpio", "reset-gpio-active-high" }, + { "fsl,imx8mm-pcie", "reset-gpio", "reset-gpio-active-high" }, + { "fsl,imx8mp-pcie", "reset-gpio", "reset-gpio-active-high" }, +#endif + /* * The regulator GPIO handles are specified such that the * presence or absence of "enable-active-high" solely controls * the polarity of the GPIO line. Any phandle flags must * be actively ignored. */ - if ((*flags & OF_GPIO_ACTIVE_LOW) && !active_low) { - pr_warn("%s GPIO handle specifies active low - ignored\n", - of_node_full_name(np)); - *flags &= ~OF_GPIO_ACTIVE_LOW; +#if IS_ENABLED(CONFIG_REGULATOR_FIXED_VOLTAGE) + { "regulator-fixed", "gpios", "enable-active-high" }, + { "regulator-fixed", "gpio", "enable-active-high" }, + { "reg-fixed-voltage", "gpios", "enable-active-high" }, + { "reg-fixed-voltage", "gpio", "enable-active-high" }, +#endif +#if IS_ENABLED(CONFIG_REGULATOR_GPIO) + { "regulator-gpio", "enable-gpio", "enable-active-high" }, + { "regulator-gpio", "enable-gpios", "enable-active-high" }, +#endif + }; + unsigned int i; + bool active_high; + + for (i = 0; i < ARRAY_SIZE(gpios); i++) { + if (of_device_is_compatible(np, gpios[i].compatible) && + !strcmp(propname, gpios[i].gpio_propname)) { + active_high = of_property_read_bool(np, + gpios[i].polarity_propname); + of_gpio_quirk_polarity(np, active_high, flags); + break; } - if (active_low) - *flags |= OF_GPIO_ACTIVE_LOW; } +} + +static void of_gpio_flags_quirks(const struct device_node *np, + const char *propname, + enum of_gpio_flags *flags, + int index) +{ + of_gpio_try_fixup_polarity(np, propname, flags); + of_gpio_set_polarity_by_property(np, propname, flags); + /* * Legacy open drain handling for fixed voltage regulators. */ @@ -200,18 +278,10 @@ static void of_gpio_flags_quirks(const struct device_node *np, * conflict and the "spi-cs-high" flag will * take precedence. */ - if (of_property_read_bool(child, "spi-cs-high")) { - if (*flags & OF_GPIO_ACTIVE_LOW) { - pr_warn("%s GPIO handle specifies active low - ignored\n", - of_node_full_name(child)); - *flags &= ~OF_GPIO_ACTIVE_LOW; - } - } else { - if (!(*flags & OF_GPIO_ACTIVE_LOW)) - pr_info("%s enforce active low on chipselect handle\n", - of_node_full_name(child)); - *flags |= OF_GPIO_ACTIVE_LOW; - } + bool active_high = of_property_read_bool(child, + "spi-cs-high"); + of_gpio_quirk_polarity(child, active_high, + flags); of_node_put(child); break; } @@ -365,127 +435,164 @@ struct gpio_desc *gpiod_get_from_of_node(const struct device_node *node, } EXPORT_SYMBOL_GPL(gpiod_get_from_of_node); -/* - * The SPI GPIO bindings happened before we managed to establish that GPIO - * properties should be named "foo-gpios" so we have this special kludge for - * them. - */ -static struct gpio_desc *of_find_spi_gpio(struct device_node *np, - const char *con_id, - unsigned int idx, - enum of_gpio_flags *of_flags) -{ - char prop_name[32]; /* 32 is max size of property name */ - - /* - * Hopefully the compiler stubs the rest of the function if this - * is false. - */ - if (!IS_ENABLED(CONFIG_SPI_MASTER)) - return ERR_PTR(-ENOENT); - - /* Allow this specifically for "spi-gpio" devices */ - if (!of_device_is_compatible(np, "spi-gpio") || !con_id) - return ERR_PTR(-ENOENT); - - /* Will be "gpio-sck", "gpio-mosi" or "gpio-miso" */ - snprintf(prop_name, sizeof(prop_name), "%s-%s", "gpio", con_id); - - return of_get_named_gpiod_flags(np, prop_name, idx, of_flags); -} - -/* - * The old Freescale bindings use simply "gpios" as name for the chip select - * lines rather than "cs-gpios" like all other SPI hardware. Account for this - * with a special quirk. - */ -static struct gpio_desc *of_find_spi_cs_gpio(struct device_node *np, +static struct gpio_desc *of_find_gpio_rename(struct device_node *np, const char *con_id, unsigned int idx, enum of_gpio_flags *of_flags) { - if (!IS_ENABLED(CONFIG_SPI_MASTER)) - return ERR_PTR(-ENOENT); + static const struct of_rename_gpio { + const char *con_id; + const char *legacy_id; /* NULL - same as con_id */ + /* + * Compatible string can be set to NULL in case where + * matching to a particular compatible is not practical, + * but it should only be done for gpio names that have + * vendor prefix to reduce risk of false positives. + * Addition of such entries is strongly discouraged. + */ + const char *compatible; + } gpios[] = { +#if !IS_ENABLED(CONFIG_LCD_HX8357) + /* Himax LCD controllers used "gpios-reset" */ + { "reset", "gpios-reset", "himax,hx8357" }, + { "reset", "gpios-reset", "himax,hx8369" }, +#endif +#if IS_ENABLED(CONFIG_MFD_ARIZONA) + { "wlf,reset", NULL, NULL }, +#endif +#if IS_ENABLED(CONFIG_RTC_DRV_MOXART) + { "rtc-data", "gpio-rtc-data", "moxa,moxart-rtc" }, + { "rtc-sclk", "gpio-rtc-sclk", "moxa,moxart-rtc" }, + { "rtc-reset", "gpio-rtc-reset", "moxa,moxart-rtc" }, +#endif +#if IS_ENABLED(CONFIG_NFC_MRVL_I2C) + { "reset", "reset-n-io", "marvell,nfc-i2c" }, +#endif +#if IS_ENABLED(CONFIG_NFC_MRVL_SPI) + { "reset", "reset-n-io", "marvell,nfc-spi" }, +#endif +#if IS_ENABLED(CONFIG_NFC_MRVL_UART) + { "reset", "reset-n-io", "marvell,nfc-uart" }, + { "reset", "reset-n-io", "mrvl,nfc-uart" }, +#endif +#if !IS_ENABLED(CONFIG_PCI_LANTIQ) + /* MIPS Lantiq PCI */ + { "reset", "gpios-reset", "lantiq,pci-xway" }, +#endif - /* Allow this specifically for Freescale and PPC devices */ - if (!of_device_is_compatible(np, "fsl,spi") && - !of_device_is_compatible(np, "aeroflexgaisler,spictrl") && - !of_device_is_compatible(np, "ibm,ppc4xx-spi")) - return ERR_PTR(-ENOENT); - /* Allow only if asking for "cs-gpios" */ - if (!con_id || strcmp(con_id, "cs")) - return ERR_PTR(-ENOENT); + /* + * Some regulator bindings happened before we managed to + * establish that GPIO properties should be named + * "foo-gpios" so we have this special kludge for them. + */ +#if IS_ENABLED(CONFIG_REGULATOR_ARIZONA_LDO1) + { "wlf,ldoena", NULL, NULL }, /* Arizona */ +#endif +#if IS_ENABLED(CONFIG_REGULATOR_WM8994) + { "wlf,ldo1ena", NULL, NULL }, /* WM8994 */ + { "wlf,ldo2ena", NULL, NULL }, /* WM8994 */ +#endif - /* - * While all other SPI controllers use "cs-gpios" the Freescale - * uses just "gpios" so translate to that when "cs-gpios" is - * requested. - */ - return of_get_named_gpiod_flags(np, "gpios", idx, of_flags); -} +#if IS_ENABLED(CONFIG_SND_SOC_CS42L56) + { "reset", "cirrus,gpio-nreset", "cirrus,cs42l56" }, +#endif +#if IS_ENABLED(CONFIG_SND_SOC_TLV320AIC3X) + { "reset", "gpio-reset", "ti,tlv320aic3x" }, + { "reset", "gpio-reset", "ti,tlv320aic33" }, + { "reset", "gpio-reset", "ti,tlv320aic3007" }, + { "reset", "gpio-reset", "ti,tlv320aic3104" }, + { "reset", "gpio-reset", "ti,tlv320aic3106" }, +#endif +#if IS_ENABLED(CONFIG_SPI_GPIO) + /* + * The SPI GPIO bindings happened before we managed to + * establish that GPIO properties should be named + * "foo-gpios" so we have this special kludge for them. + */ + { "miso", "gpio-miso", "spi-gpio" }, + { "mosi", "gpio-mosi", "spi-gpio" }, + { "sck", "gpio-sck", "spi-gpio" }, +#endif -/* - * Some regulator bindings happened before we managed to establish that GPIO - * properties should be named "foo-gpios" so we have this special kludge for - * them. - */ -static struct gpio_desc *of_find_regulator_gpio(struct device_node *np, - const char *con_id, - unsigned int idx, - enum of_gpio_flags *of_flags) -{ - /* These are the connection IDs we accept as legacy GPIO phandles */ - const char *whitelist[] = { - "wlf,ldoena", /* Arizona */ - "wlf,ldo1ena", /* WM8994 */ - "wlf,ldo2ena", /* WM8994 */ - }; - int i; + /* + * The old Freescale bindings use simply "gpios" as name + * for the chip select lines rather than "cs-gpios" like + * all other SPI hardware. Allow this specifically for + * Freescale and PPC devices. + */ +#if IS_ENABLED(CONFIG_SPI_FSL_SPI) + { "cs", "gpios", "fsl,spi" }, + { "cs", "gpios", "aeroflexgaisler,spictrl" }, +#endif +#if IS_ENABLED(CONFIG_SPI_PPC4xx) + { "cs", "gpios", "ibm,ppc4xx-spi" }, +#endif - if (!IS_ENABLED(CONFIG_REGULATOR)) - return ERR_PTR(-ENOENT); +#if IS_ENABLED(CONFIG_TYPEC_FUSB302) + /* + * Fairchild FUSB302 host is using undocumented "fcs,int_n" + * property without the compulsory "-gpios" suffix. + */ + { "fcs,int_n", NULL, "fcs,fusb302" }, +#endif + }; + struct gpio_desc *desc; + const char *legacy_id; + unsigned int i; if (!con_id) return ERR_PTR(-ENOENT); - i = match_string(whitelist, ARRAY_SIZE(whitelist), con_id); - if (i < 0) - return ERR_PTR(-ENOENT); + for (i = 0; i < ARRAY_SIZE(gpios); i++) { + if (strcmp(con_id, gpios[i].con_id)) + continue; + + if (gpios[i].compatible && + !of_device_is_compatible(np, gpios[i].compatible)) + continue; + + legacy_id = gpios[i].legacy_id ?: gpios[i].con_id; + desc = of_get_named_gpiod_flags(np, legacy_id, idx, of_flags); + if (!gpiod_not_found(desc)) { + pr_info("%s uses legacy gpio name '%s' instead of '%s-gpios'\n", + of_node_full_name(np), legacy_id, con_id); + return desc; + } + } - return of_get_named_gpiod_flags(np, con_id, idx, of_flags); + return ERR_PTR(-ENOENT); } -static struct gpio_desc *of_find_arizona_gpio(struct device_node *np, - const char *con_id, - unsigned int idx, - enum of_gpio_flags *of_flags) +static struct gpio_desc *of_find_mt2701_gpio(struct device_node *np, + const char *con_id, + unsigned int idx, + enum of_gpio_flags *of_flags) { - if (!IS_ENABLED(CONFIG_MFD_ARIZONA)) - return ERR_PTR(-ENOENT); + struct gpio_desc *desc; + const char *legacy_id; - if (!con_id || strcmp(con_id, "wlf,reset")) + if (!IS_ENABLED(CONFIG_SND_SOC_MT2701_CS42448)) return ERR_PTR(-ENOENT); - return of_get_named_gpiod_flags(np, con_id, idx, of_flags); -} + if (!of_device_is_compatible(np, "mediatek,mt2701-cs42448-machine")) + return ERR_PTR(-ENOENT); -static struct gpio_desc *of_find_usb_gpio(struct device_node *np, - const char *con_id, - unsigned int idx, - enum of_gpio_flags *of_flags) -{ - /* - * Currently this USB quirk is only for the Fairchild FUSB302 host - * which is using an undocumented DT GPIO line named "fcs,int_n" - * without the compulsory "-gpios" suffix. - */ - if (!IS_ENABLED(CONFIG_TYPEC_FUSB302)) + if (!con_id || strcmp(con_id, "i2s1-in-sel")) return ERR_PTR(-ENOENT); - if (!con_id || strcmp(con_id, "fcs,int_n")) + if (idx == 0) + legacy_id = "i2s1-in-sel-gpio1"; + else if (idx == 1) + legacy_id = "i2s1-in-sel-gpio2"; + else return ERR_PTR(-ENOENT); - return of_get_named_gpiod_flags(np, con_id, idx, of_flags); + desc = of_get_named_gpiod_flags(np, legacy_id, 0, of_flags); + if (!gpiod_not_found(desc)) + pr_info("%s is using legacy gpio name '%s' instead of '%s-gpios'\n", + of_node_full_name(np), legacy_id, con_id); + + return desc; } typedef struct gpio_desc *(*of_find_gpio_quirk)(struct device_node *np, @@ -493,15 +600,12 @@ typedef struct gpio_desc *(*of_find_gpio_quirk)(struct device_node *np, unsigned int idx, enum of_gpio_flags *of_flags); static const of_find_gpio_quirk of_find_gpio_quirks[] = { - of_find_spi_gpio, - of_find_spi_cs_gpio, - of_find_regulator_gpio, - of_find_arizona_gpio, - of_find_usb_gpio, + of_find_gpio_rename, + of_find_mt2701_gpio, NULL }; -struct gpio_desc *of_find_gpio(struct device *dev, const char *con_id, +struct gpio_desc *of_find_gpio(struct device_node *np, const char *con_id, unsigned int idx, unsigned long *flags) { char prop_name[32]; /* 32 is max size of property name */ @@ -519,8 +623,7 @@ struct gpio_desc *of_find_gpio(struct device *dev, const char *con_id, snprintf(prop_name, sizeof(prop_name), "%s", gpio_suffixes[i]); - desc = of_get_named_gpiod_flags(dev->of_node, prop_name, idx, - &of_flags); + desc = of_get_named_gpiod_flags(np, prop_name, idx, &of_flags); if (!gpiod_not_found(desc)) break; @@ -528,7 +631,7 @@ struct gpio_desc *of_find_gpio(struct device *dev, const char *con_id, /* Properly named GPIO was not found, try workarounds */ for (q = of_find_gpio_quirks; gpiod_not_found(desc) && *q; q++) - desc = (*q)(dev->of_node, con_id, idx, &of_flags); + desc = (*q)(np, con_id, idx, &of_flags); if (IS_ERR(desc)) return desc; @@ -831,8 +934,8 @@ int of_mm_gpiochip_add_data(struct device_node *np, if (mm_gc->save_regs) mm_gc->save_regs(mm_gc); - of_node_put(mm_gc->gc.of_node); - mm_gc->gc.of_node = of_node_get(np); + fwnode_handle_put(mm_gc->gc.fwnode); + mm_gc->gc.fwnode = fwnode_handle_get(of_fwnode_handle(np)); ret = gpiochip_add_data(gc, data); if (ret) @@ -858,37 +961,12 @@ void of_mm_gpiochip_remove(struct of_mm_gpio_chip *mm_gc) { struct gpio_chip *gc = &mm_gc->gc; - if (!mm_gc) - return; - gpiochip_remove(gc); iounmap(mm_gc->regs); kfree(gc->label); } EXPORT_SYMBOL_GPL(of_mm_gpiochip_remove); -static void of_gpiochip_init_valid_mask(struct gpio_chip *chip) -{ - int len, i; - u32 start, count; - struct device_node *np = chip->of_node; - - len = of_property_count_u32_elems(np, "gpio-reserved-ranges"); - if (len < 0 || len % 2 != 0) - return; - - for (i = 0; i < len; i += 2) { - of_property_read_u32_index(np, "gpio-reserved-ranges", - i, &start); - of_property_read_u32_index(np, "gpio-reserved-ranges", - i + 1, &count); - if (start >= chip->ngpio || start + count > chip->ngpio) - continue; - - bitmap_clear(chip->valid_mask, start, count); - } -}; - #ifdef CONFIG_PINCTRL static int of_gpiochip_add_pin_range(struct gpio_chip *chip) { @@ -982,9 +1060,11 @@ static int of_gpiochip_add_pin_range(struct gpio_chip *chip) { return 0; } int of_gpiochip_add(struct gpio_chip *chip) { + struct device_node *np; int ret; - if (!chip->of_node) + np = to_of_node(dev_fwnode(&chip->gpiodev->dev)); + if (!np) return 0; if (!chip->of_xlate) { @@ -995,24 +1075,22 @@ int of_gpiochip_add(struct gpio_chip *chip) if (chip->of_gpio_n_cells > MAX_PHANDLE_ARGS) return -EINVAL; - of_gpiochip_init_valid_mask(chip); - ret = of_gpiochip_add_pin_range(chip); if (ret) return ret; - of_node_get(chip->of_node); + fwnode_handle_get(chip->fwnode); ret = of_gpiochip_scan_gpios(chip); if (ret) - of_node_put(chip->of_node); + fwnode_handle_put(chip->fwnode); return ret; } void of_gpiochip_remove(struct gpio_chip *chip) { - of_node_put(chip->of_node); + fwnode_handle_put(chip->fwnode); } void of_gpio_dev_init(struct gpio_chip *gc, struct gpio_device *gdev) diff --git a/drivers/gpio/gpiolib-of.h b/drivers/gpio/gpiolib-of.h index 1b5df39a952e07..a6c593e6766c59 100644 --- a/drivers/gpio/gpiolib-of.h +++ b/drivers/gpio/gpiolib-of.h @@ -16,17 +16,16 @@ struct gpio_desc; struct gpio_device; #ifdef CONFIG_OF_GPIO -struct gpio_desc *of_find_gpio(struct device *dev, +struct gpio_desc *of_find_gpio(struct device_node *np, const char *con_id, unsigned int idx, unsigned long *lookupflags); int of_gpiochip_add(struct gpio_chip *gc); void of_gpiochip_remove(struct gpio_chip *gc); int of_gpio_get_count(struct device *dev, const char *con_id); -bool of_gpio_need_valid_mask(const struct gpio_chip *gc); void of_gpio_dev_init(struct gpio_chip *gc, struct gpio_device *gdev); #else -static inline struct gpio_desc *of_find_gpio(struct device *dev, +static inline struct gpio_desc *of_find_gpio(struct device_node *np, const char *con_id, unsigned int idx, unsigned long *lookupflags) @@ -39,10 +38,6 @@ static inline int of_gpio_get_count(struct device *dev, const char *con_id) { return 0; } -static inline bool of_gpio_need_valid_mask(const struct gpio_chip *gc) -{ - return false; -} static inline void of_gpio_dev_init(struct gpio_chip *gc, struct gpio_device *gdev) { diff --git a/drivers/gpio/gpiolib-swnode.c b/drivers/gpio/gpiolib-swnode.c new file mode 100644 index 00000000000000..dd9ccac214d19e --- /dev/null +++ b/drivers/gpio/gpiolib-swnode.c @@ -0,0 +1,123 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Software Node helpers for the GPIO API + * + * Copyright 2022 Google LLC + */ +#include <linux/err.h> +#include <linux/errno.h> +#include <linux/gpio/consumer.h> +#include <linux/gpio/driver.h> +#include <linux/kernel.h> +#include <linux/printk.h> +#include <linux/property.h> +#include <linux/string.h> + +#include "gpiolib.h" +#include "gpiolib-swnode.h" + +static void swnode_format_propname(const char *con_id, char *propname, + size_t max_size) +{ + /* + * Note we do not need to try both -gpios and -gpio suffixes, + * as, unlike OF and ACPI, we can fix software nodes to conform + * to the proper binding. + */ + if (con_id) + snprintf(propname, max_size, "%s-gpios", con_id); + else + strscpy(propname, "gpios", max_size); +} + +static int swnode_gpiochip_match_name(struct gpio_chip *chip, void *data) +{ + return !strcmp(chip->label, data); +} + +static struct gpio_chip *swnode_get_chip(struct fwnode_handle *fwnode) +{ + const struct software_node *chip_node; + struct gpio_chip *chip; + + chip_node = to_software_node(fwnode); + if (!chip_node || !chip_node->name) + return ERR_PTR(-EINVAL); + + chip = gpiochip_find((void *)chip_node->name, swnode_gpiochip_match_name); + return chip ?: ERR_PTR(-EPROBE_DEFER); +} + +struct gpio_desc *swnode_find_gpio(struct fwnode_handle *fwnode, + const char *con_id, unsigned int idx, + unsigned long *flags) +{ + const struct software_node *swnode; + struct fwnode_reference_args args; + struct gpio_chip *chip; + struct gpio_desc *desc; + char propname[32]; /* 32 is max size of property name */ + int error; + + swnode = to_software_node(fwnode); + if (!swnode) + return ERR_PTR(-EINVAL); + + swnode_format_propname(con_id, propname, sizeof(propname)); + + /* + * We expect all swnode-described GPIOs have GPIO number and + * polarity arguments, hence nargs is set to 2. + */ + error = fwnode_property_get_reference_args(fwnode, propname, NULL, 2, idx, &args); + if (error) { + pr_debug("%s: can't parse '%s' property of node '%pfwP[%d]'\n", + __func__, propname, fwnode, idx); + return ERR_PTR(error); + } + + chip = swnode_get_chip(args.fwnode); + fwnode_handle_put(args.fwnode); + if (IS_ERR(chip)) + return ERR_CAST(chip); + + desc = gpiochip_get_desc(chip, args.args[0]); + *flags = args.args[1]; /* We expect native GPIO flags */ + + pr_debug("%s: parsed '%s' property of node '%pfwP[%d]' - status (%d)\n", + __func__, propname, fwnode, idx, PTR_ERR_OR_ZERO(desc)); + + return desc; +} + +/** + * swnode_gpio_count - count the GPIOs associated with a device / function + * @fwnode: firmware node of the GPIO consumer, can be %NULL for + * system-global GPIOs + * @con_id: function within the GPIO consumer + * + * Return: + * The number of GPIOs associated with a device / function or %-ENOENT, + * if no GPIO has been assigned to the requested function. + */ +int swnode_gpio_count(const struct fwnode_handle *fwnode, const char *con_id) +{ + struct fwnode_reference_args args; + char propname[32]; + int count; + + swnode_format_propname(con_id, propname, sizeof(propname)); + + /* + * This is not very efficient, but GPIO lists usually have only + * 1 or 2 entries. + */ + count = 0; + while (fwnode_property_get_reference_args(fwnode, propname, NULL, 0, + count, &args) == 0) { + fwnode_handle_put(args.fwnode); + count++; + } + + return count ?: -ENOENT; +} diff --git a/drivers/gpio/gpiolib-swnode.h b/drivers/gpio/gpiolib-swnode.h new file mode 100644 index 00000000000000..af849e56f6bce9 --- /dev/null +++ b/drivers/gpio/gpiolib-swnode.h @@ -0,0 +1,14 @@ +/* SPDX-License-Identifier: GPL-2.0 */ + +#ifndef GPIOLIB_SWNODE_H +#define GPIOLIB_SWNODE_H + +struct fwnode_handle; +struct gpio_desc; + +struct gpio_desc *swnode_find_gpio(struct fwnode_handle *fwnode, + const char *con_id, unsigned int idx, + unsigned long *flags); +int swnode_gpio_count(const struct fwnode_handle *fwnode, const char *con_id); + +#endif /* GPIOLIB_SWNODE_H */ diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c index a70522aef3557e..5a66d9616d7cce 100644 --- a/drivers/gpio/gpiolib.c +++ b/drivers/gpio/gpiolib.c @@ -26,6 +26,7 @@ #include "gpiolib.h" #include "gpiolib-of.h" #include "gpiolib-acpi.h" +#include "gpiolib-swnode.h" #include "gpiolib-cdev.h" #include "gpiolib-sysfs.h" @@ -183,14 +184,14 @@ EXPORT_SYMBOL_GPL(gpiod_to_chip); static int gpiochip_find_base(int ngpio) { struct gpio_device *gdev; - int base = ARCH_NR_GPIOS - ngpio; + int base = GPIO_DYNAMIC_BASE; - list_for_each_entry_reverse(gdev, &gpio_devices, list) { + list_for_each_entry(gdev, &gpio_devices, list) { /* found a free space? */ - if (gdev->base + gdev->ngpio <= base) + if (gdev->base >= base + ngpio) break; - /* nope, check the space right before the chip */ - base = gdev->base - ngpio; + /* nope, check the space right after the chip */ + base = gdev->base + gdev->ngpio; } if (gpio_is_valid(base)) { @@ -366,12 +367,12 @@ static int gpiochip_set_desc_names(struct gpio_chip *gc) static int devprop_gpiochip_set_names(struct gpio_chip *chip) { struct gpio_device *gdev = chip->gpiodev; - struct fwnode_handle *fwnode = dev_fwnode(&gdev->dev); + struct device *dev = &gdev->dev; const char **names; int ret, i; int count; - count = fwnode_property_string_array_count(fwnode, "gpio-line-names"); + count = device_property_string_array_count(dev, "gpio-line-names"); if (count < 0) return 0; @@ -384,7 +385,7 @@ static int devprop_gpiochip_set_names(struct gpio_chip *chip) * gpiochips. */ if (count <= chip->offset) { - dev_warn(&gdev->dev, "gpio-line-names too short (length %d), cannot map names for the gpiochip at offset %u\n", + dev_warn(dev, "gpio-line-names too short (length %d), cannot map names for the gpiochip at offset %u\n", count, chip->offset); return 0; } @@ -393,10 +394,10 @@ static int devprop_gpiochip_set_names(struct gpio_chip *chip) if (!names) return -ENOMEM; - ret = fwnode_property_read_string_array(fwnode, "gpio-line-names", + ret = device_property_read_string_array(dev, "gpio-line-names", names, count); if (ret < 0) { - dev_warn(&gdev->dev, "failed to read GPIO line names\n"); + dev_warn(dev, "failed to read GPIO line names\n"); kfree(names); return ret; } @@ -445,9 +446,22 @@ static unsigned long *gpiochip_allocate_mask(struct gpio_chip *gc) return p; } +static unsigned int gpiochip_count_reserved_ranges(struct gpio_chip *gc) +{ + struct device *dev = &gc->gpiodev->dev; + int size; + + /* Format is "start, count, ..." */ + size = device_property_count_u32(dev, "gpio-reserved-ranges"); + if (size > 0 && size % 2 == 0) + return size; + + return 0; +} + static int gpiochip_alloc_valid_mask(struct gpio_chip *gc) { - if (!(of_gpio_need_valid_mask(gc) || gc->init_valid_mask)) + if (!(gpiochip_count_reserved_ranges(gc) || gc->init_valid_mask)) return 0; gc->valid_mask = gpiochip_allocate_mask(gc); @@ -457,8 +471,50 @@ static int gpiochip_alloc_valid_mask(struct gpio_chip *gc) return 0; } +static int gpiochip_apply_reserved_ranges(struct gpio_chip *gc) +{ + struct device *dev = &gc->gpiodev->dev; + unsigned int size; + u32 *ranges; + int ret; + + size = gpiochip_count_reserved_ranges(gc); + if (size == 0) + return 0; + + ranges = kmalloc_array(size, sizeof(*ranges), GFP_KERNEL); + if (!ranges) + return -ENOMEM; + + ret = device_property_read_u32_array(dev, "gpio-reserved-ranges", + ranges, size); + if (ret) { + kfree(ranges); + return ret; + } + + while (size) { + u32 count = ranges[--size]; + u32 start = ranges[--size]; + + if (start >= gc->ngpio || start + count > gc->ngpio) + continue; + + bitmap_clear(gc->valid_mask, start, count); + } + + kfree(ranges); + return 0; +} + static int gpiochip_init_valid_mask(struct gpio_chip *gc) { + int ret; + + ret = gpiochip_apply_reserved_ranges(gc); + if (ret) + return ret; + if (gc->init_valid_mask) return gc->init_valid_mask(gc, gc->valid_mask, @@ -493,7 +549,7 @@ EXPORT_SYMBOL_GPL(gpiochip_line_is_valid); static void gpiodevice_release(struct device *dev) { - struct gpio_device *gdev = container_of(dev, struct gpio_device, dev); + struct gpio_device *gdev = to_gpio_device(dev); unsigned long flags; spin_lock_irqsave(&gpio_lock, flags); @@ -627,7 +683,7 @@ int gpiochip_add_data_with_key(struct gpio_chip *gc, void *data, * Assign fwnode depending on the result of the previous calls, * if none of them succeed, assign it to the parent's one. */ - gdev->dev.fwnode = dev_fwnode(&gdev->dev) ?: fwnode; + gc->fwnode = gdev->dev.fwnode = dev_fwnode(&gdev->dev) ?: fwnode; gdev->id = ida_alloc(&gpio_ida, GFP_KERNEL); if (gdev->id < 0) { @@ -719,6 +775,9 @@ int gpiochip_add_data_with_key(struct gpio_chip *gc, void *data, * a poison instead. */ gc->base = base; + } else { + dev_warn(&gdev->dev, + "Static allocation of GPIO base is deprecated, use dynamic allocation.\n"); } gdev->base = base; @@ -735,6 +794,7 @@ int gpiochip_add_data_with_key(struct gpio_chip *gc, void *data, spin_unlock_irqrestore(&gpio_lock, flags); BLOCKING_INIT_NOTIFIER_HEAD(&gdev->notifier); + init_rwsem(&gdev->sem); #ifdef CONFIG_PINCTRL INIT_LIST_HEAD(&gdev->pin_ranges); @@ -875,6 +935,8 @@ void gpiochip_remove(struct gpio_chip *gc) unsigned long flags; unsigned int i; + down_write(&gdev->sem); + /* FIXME: should the legacy sysfs handling be moved to gpio_device? */ gpiochip_sysfs_unregister(gdev); gpiochip_free_hogs(gc); @@ -909,6 +971,7 @@ void gpiochip_remove(struct gpio_chip *gc) * gone. */ gcdev_unregister(gdev); + up_write(&gdev->sem); put_device(&gdev->dev); } EXPORT_SYMBOL_GPL(gpiochip_remove); @@ -3808,62 +3871,88 @@ static int platform_gpio_count(struct device *dev, const char *con_id) return count; } -/** - * fwnode_get_named_gpiod - obtain a GPIO from firmware node - * @fwnode: handle of the firmware node - * @propname: name of the firmware property representing the GPIO - * @index: index of the GPIO to obtain for the consumer - * @dflags: GPIO initialization flags - * @label: label to attach to the requested GPIO - * - * This function can be used for drivers that get their configuration - * from opaque firmware. - * - * The function properly finds the corresponding GPIO using whatever is the - * underlying firmware interface and then makes sure that the GPIO - * descriptor is requested before it is returned to the caller. - * - * Returns: - * On successful request the GPIO pin is configured in accordance with - * provided @dflags. - * - * In case of error an ERR_PTR() is returned. - */ -static struct gpio_desc *fwnode_get_named_gpiod(struct fwnode_handle *fwnode, - const char *propname, int index, - enum gpiod_flags dflags, - const char *label) +static struct gpio_desc *gpiod_find_by_fwnode(struct fwnode_handle *fwnode, + struct device *consumer, + const char *con_id, + unsigned int idx, + enum gpiod_flags *flags, + unsigned long *lookupflags) { - unsigned long lflags = GPIO_LOOKUP_FLAGS_DEFAULT; - struct gpio_desc *desc = ERR_PTR(-ENODEV); - int ret; + struct gpio_desc *desc = ERR_PTR(-ENOENT); if (is_of_node(fwnode)) { - desc = gpiod_get_from_of_node(to_of_node(fwnode), - propname, index, - dflags, - label); - return desc; + dev_dbg(consumer, "using DT '%pfw' for '%s' GPIO lookup\n", + fwnode, con_id); + desc = of_find_gpio(to_of_node(fwnode), con_id, idx, lookupflags); } else if (is_acpi_node(fwnode)) { - struct acpi_gpio_info info; + dev_dbg(consumer, "using ACPI '%pfw' for '%s' GPIO lookup\n", + fwnode, con_id); + desc = acpi_find_gpio(fwnode, con_id, idx, flags, lookupflags); + } else if (is_software_node(fwnode)) { + dev_dbg(consumer, "using swnode '%pfw' for '%s' GPIO lookup\n", + fwnode, con_id); + desc = swnode_find_gpio(fwnode, con_id, idx, lookupflags); + } - desc = acpi_node_get_gpiod(fwnode, propname, index, &info); - if (IS_ERR(desc)) - return desc; + return desc; +} - acpi_gpio_update_gpiod_flags(&dflags, &info); - acpi_gpio_update_gpiod_lookup_flags(&lflags, &info); - } else { - return ERR_PTR(-EINVAL); +static struct gpio_desc *gpiod_find_and_request(struct device *consumer, + struct fwnode_handle *fwnode, + const char *con_id, + unsigned int idx, + enum gpiod_flags flags, + const char *label, + bool platform_lookup_allowed) +{ + struct gpio_desc *desc = ERR_PTR(-ENOENT); + unsigned long lookupflags; + int ret; + + if (!IS_ERR_OR_NULL(fwnode)) + desc = gpiod_find_by_fwnode(fwnode, consumer, con_id, idx, + &flags, &lookupflags); + + if (gpiod_not_found(desc) && platform_lookup_allowed) { + /* + * Either we are not using DT or ACPI, or their lookup did not + * return a result. In that case, use platform lookup as a + * fallback. + */ + dev_dbg(consumer, "using lookup tables for GPIO lookup\n"); + desc = gpiod_find(consumer, con_id, idx, &lookupflags); } - /* Currently only ACPI takes this path */ + if (IS_ERR(desc)) { + dev_dbg(consumer, "No GPIO consumer %s found\n", con_id); + return desc; + } + + /* + * If a connection label was passed use that, else attempt to use + * the device name as label + */ ret = gpiod_request(desc, label); - if (ret) - return ERR_PTR(ret); + if (ret) { + if (!(ret == -EBUSY && flags & GPIOD_FLAGS_BIT_NONEXCLUSIVE)) + return ERR_PTR(ret); + + /* + * This happens when there are several consumers for + * the same GPIO line: we just return here without + * further initialization. It is a bit of a hack. + * This is necessary to support fixed regulators. + * + * FIXME: Make this more sane and safe. + */ + dev_info(consumer, + "nonexclusive access to GPIO for %s\n", con_id); + return desc; + } - ret = gpiod_configure_flags(desc, propname, lflags, dflags); + ret = gpiod_configure_flags(desc, con_id, lookupflags, flags); if (ret < 0) { + dev_dbg(consumer, "setup of GPIO %s failed\n", con_id); gpiod_put(desc); return ERR_PTR(ret); } @@ -3896,29 +3985,12 @@ static struct gpio_desc *fwnode_get_named_gpiod(struct fwnode_handle *fwnode, * In case of error an ERR_PTR() is returned. */ struct gpio_desc *fwnode_gpiod_get_index(struct fwnode_handle *fwnode, - const char *con_id, int index, + const char *con_id, + int index, enum gpiod_flags flags, const char *label) { - struct gpio_desc *desc; - char prop_name[32]; /* 32 is max size of property name */ - unsigned int i; - - for (i = 0; i < ARRAY_SIZE(gpio_suffixes); i++) { - if (con_id) - snprintf(prop_name, sizeof(prop_name), "%s-%s", - con_id, gpio_suffixes[i]); - else - snprintf(prop_name, sizeof(prop_name), "%s", - gpio_suffixes[i]); - - desc = fwnode_get_named_gpiod(fwnode, prop_name, index, flags, - label); - if (!gpiod_not_found(desc)) - break; - } - - return desc; + return gpiod_find_and_request(NULL, fwnode, con_id, index, flags, label, false); } EXPORT_SYMBOL_GPL(fwnode_gpiod_get_index); @@ -3937,6 +4009,8 @@ int gpiod_count(struct device *dev, const char *con_id) count = of_gpio_get_count(dev, con_id); else if (is_acpi_node(fwnode)) count = acpi_gpio_count(dev, con_id); + else if (is_software_node(fwnode)) + count = swnode_gpio_count(fwnode, con_id); if (count < 0) count = platform_gpio_count(dev, con_id); @@ -4072,70 +4146,11 @@ struct gpio_desc *__must_check gpiod_get_index(struct device *dev, unsigned int idx, enum gpiod_flags flags) { - unsigned long lookupflags = GPIO_LOOKUP_FLAGS_DEFAULT; - struct gpio_desc *desc = NULL; - int ret; - /* Maybe we have a device name, maybe not */ + struct fwnode_handle *fwnode = dev ? dev_fwnode(dev) : NULL; const char *devname = dev ? dev_name(dev) : "?"; - const struct fwnode_handle *fwnode = dev ? dev_fwnode(dev) : NULL; - - dev_dbg(dev, "GPIO lookup for consumer %s\n", con_id); - - /* Using device tree? */ - if (is_of_node(fwnode)) { - dev_dbg(dev, "using device tree for GPIO lookup\n"); - desc = of_find_gpio(dev, con_id, idx, &lookupflags); - } else if (is_acpi_node(fwnode)) { - dev_dbg(dev, "using ACPI for GPIO lookup\n"); - desc = acpi_find_gpio(dev, con_id, idx, &flags, &lookupflags); - } - - /* - * Either we are not using DT or ACPI, or their lookup did not return - * a result. In that case, use platform lookup as a fallback. - */ - if (!desc || gpiod_not_found(desc)) { - dev_dbg(dev, "using lookup tables for GPIO lookup\n"); - desc = gpiod_find(dev, con_id, idx, &lookupflags); - } - - if (IS_ERR(desc)) { - dev_dbg(dev, "No GPIO consumer %s found\n", con_id); - return desc; - } - - /* - * If a connection label was passed use that, else attempt to use - * the device name as label - */ - ret = gpiod_request(desc, con_id ?: devname); - if (ret) { - if (!(ret == -EBUSY && flags & GPIOD_FLAGS_BIT_NONEXCLUSIVE)) - return ERR_PTR(ret); - - /* - * This happens when there are several consumers for - * the same GPIO line: we just return here without - * further initialization. It is a bit of a hack. - * This is necessary to support fixed regulators. - * - * FIXME: Make this more sane and safe. - */ - dev_info(dev, "nonexclusive access to GPIO for %s\n", con_id ?: devname); - return desc; - } - - ret = gpiod_configure_flags(desc, con_id, lookupflags, flags); - if (ret < 0) { - dev_dbg(dev, "setup of GPIO %s failed\n", con_id); - gpiod_put(desc); - return ERR_PTR(ret); - } + const char *label = con_id ?: devname; - blocking_notifier_call_chain(&desc->gdev->notifier, - GPIOLINE_CHANGED_REQUESTED, desc); - - return desc; + return gpiod_find_and_request(dev, fwnode, con_id, idx, flags, label, true); } EXPORT_SYMBOL_GPL(gpiod_get_index); diff --git a/drivers/gpio/gpiolib.h b/drivers/gpio/gpiolib.h index d900ecdbac46df..b3c2db6eba80cb 100644 --- a/drivers/gpio/gpiolib.h +++ b/drivers/gpio/gpiolib.h @@ -15,14 +15,15 @@ #include <linux/device.h> #include <linux/module.h> #include <linux/cdev.h> +#include <linux/rwsem.h> #define GPIOCHIP_NAME "gpiochip" /** * struct gpio_device - internal state container for GPIO devices - * @id: numerical ID number for the GPIO chip * @dev: the GPIO device struct * @chrdev: character device for the GPIO device + * @id: numerical ID number for the GPIO chip * @mockdev: class device used by the deprecated sysfs interface (may be * NULL) * @owner: helps prevent removal of modules exporting active GPIOs @@ -39,6 +40,9 @@ * @list: links gpio_device:s together for traversal * @notifier: used to notify subscribers about lines being requested, released * or reconfigured + * @sem: protects the structure from a NULL-pointer dereference of @chip by + * user-space operations when the device gets unregistered during + * a hot-unplug event * @pin_ranges: range of pins served by the GPIO driver * * This state container holds most of the runtime variable data @@ -47,9 +51,9 @@ * userspace. */ struct gpio_device { - int id; struct device dev; struct cdev chrdev; + int id; struct device *mockdev; struct module *owner; struct gpio_chip *chip; @@ -60,6 +64,7 @@ struct gpio_device { void *data; struct list_head list; struct blocking_notifier_head notifier; + struct rw_semaphore sem; #ifdef CONFIG_PINCTRL /* @@ -72,6 +77,11 @@ struct gpio_device { #endif }; +static inline struct gpio_device *to_gpio_device(struct device *dev) +{ + return container_of(dev, struct gpio_device, dev); +} + /* gpio suffixes used for ACPI and device tree lookup */ static __maybe_unused const char * const gpio_suffixes[] = { "gpios", "gpio" }; diff --git a/drivers/leds/blink/leds-lgm-sso.c b/drivers/leds/blink/leds-lgm-sso.c index 6f270c0272fb1b..35c61311e7fd8b 100644 --- a/drivers/leds/blink/leds-lgm-sso.c +++ b/drivers/leds/blink/leds-lgm-sso.c @@ -635,9 +635,8 @@ __sso_led_dt_parse(struct sso_led_priv *priv, struct fwnode_handle *fw_ssoled) led->priv = priv; desc = &led->desc; - led->gpiod = devm_fwnode_get_gpiod_from_child(dev, NULL, - fwnode_child, - GPIOD_ASIS, NULL); + led->gpiod = devm_fwnode_gpiod_get(dev, fwnode_child, NULL, + GPIOD_ASIS, NULL); if (IS_ERR(led->gpiod)) { ret = dev_err_probe(dev, PTR_ERR(led->gpiod), "led: get gpio fail!\n"); goto __dt_err; diff --git a/drivers/leds/leds-gpio.c b/drivers/leds/leds-gpio.c index 092eb59a7d325d..ce4e79939731d8 100644 --- a/drivers/leds/leds-gpio.c +++ b/drivers/leds/leds-gpio.c @@ -151,9 +151,8 @@ static struct gpio_leds_priv *gpio_leds_create(struct platform_device *pdev) * will be updated after LED class device is registered, * Only then the final LED name is known. */ - led.gpiod = devm_fwnode_get_gpiod_from_child(dev, NULL, child, - GPIOD_ASIS, - NULL); + led.gpiod = devm_fwnode_gpiod_get(dev, child, NULL, GPIOD_ASIS, + NULL); if (IS_ERR(led.gpiod)) { fwnode_handle_put(child); return ERR_CAST(led.gpiod); diff --git a/include/asm-generic/gpio.h b/include/asm-generic/gpio.h index aea9aee1f3e97b..a7752cf152ce4c 100644 --- a/include/asm-generic/gpio.h +++ b/include/asm-generic/gpio.h @@ -11,40 +11,18 @@ #include <linux/gpio/driver.h> #include <linux/gpio/consumer.h> -/* Platforms may implement their GPIO interface with library code, +/* + * Platforms may implement their GPIO interface with library code, * at a small performance cost for non-inlined operations and some * extra memory (for code and for per-GPIO table entries). - * - * While the GPIO programming interface defines valid GPIO numbers - * to be in the range 0..MAX_INT, this library restricts them to the - * smaller range 0..ARCH_NR_GPIOS-1. - * - * ARCH_NR_GPIOS is somewhat arbitrary; it usually reflects the sum of - * builtin/SoC GPIOs plus a number of GPIOs on expanders; the latter is - * actually an estimate of a board-specific value. */ -#ifndef ARCH_NR_GPIOS -#if defined(CONFIG_ARCH_NR_GPIO) && CONFIG_ARCH_NR_GPIO > 0 -#define ARCH_NR_GPIOS CONFIG_ARCH_NR_GPIO -#else -#define ARCH_NR_GPIOS 512 -#endif -#endif - /* - * "valid" GPIO numbers are nonnegative and may be passed to - * setup routines like gpio_request(). only some valid numbers - * can successfully be requested and used. - * - * Invalid GPIO numbers are useful for indicating no-such-GPIO in - * platform data and other tables. + * At the end we want all GPIOs to be dynamically allocated from 0. + * However, some legacy drivers still perform fixed allocation. + * Until they are all fixed, leave 0-512 space for them. */ - -static inline bool gpio_is_valid(int number) -{ - return number >= 0 && number < ARCH_NR_GPIOS; -} +#define GPIO_DYNAMIC_BASE 512 struct device; struct gpio; @@ -140,12 +118,6 @@ static inline void gpio_unexport(unsigned gpio) #include <linux/kernel.h> -static inline bool gpio_is_valid(int number) -{ - /* only non-negative numbers are valid */ - return number >= 0; -} - /* platforms that don't directly support access to GPIOs through I2C, SPI, * or other blocking infrastructure can use these wrappers. */ @@ -169,4 +141,19 @@ static inline void gpio_set_value_cansleep(unsigned gpio, int value) #endif /* !CONFIG_GPIOLIB */ +/* + * "valid" GPIO numbers are nonnegative and may be passed to + * setup routines like gpio_request(). only some valid numbers + * can successfully be requested and used. + * + * Invalid GPIO numbers are useful for indicating no-such-GPIO in + * platform data and other tables. + */ + +static inline bool gpio_is_valid(int number) +{ + /* only non-negative numbers are valid */ + return number >= 0; +} + #endif /* _ASM_GENERIC_GPIO_H */ diff --git a/include/linux/gpio/consumer.h b/include/linux/gpio/consumer.h index 36460ced060b0e..45da8f137fe5dd 100644 --- a/include/linux/gpio/consumer.h +++ b/include/linux/gpio/consumer.h @@ -581,27 +581,6 @@ struct gpio_desc *devm_fwnode_gpiod_get(struct device *dev, flags, label); } -static inline -struct gpio_desc *devm_fwnode_get_index_gpiod_from_child(struct device *dev, - const char *con_id, int index, - struct fwnode_handle *child, - enum gpiod_flags flags, - const char *label) -{ - return devm_fwnode_gpiod_get_index(dev, child, con_id, index, - flags, label); -} - -static inline -struct gpio_desc *devm_fwnode_get_gpiod_from_child(struct device *dev, - const char *con_id, - struct fwnode_handle *child, - enum gpiod_flags flags, - const char *label) -{ - return devm_fwnode_gpiod_get_index(dev, child, con_id, 0, flags, label); -} - #if IS_ENABLED(CONFIG_GPIOLIB) && IS_ENABLED(CONFIG_OF_GPIO) struct device_node; diff --git a/include/linux/gpio/property.h b/include/linux/gpio/property.h new file mode 100644 index 00000000000000..6c75c8bd44a0bb --- /dev/null +++ b/include/linux/gpio/property.h @@ -0,0 +1,11 @@ +// SPDX-License-Identifier: GPL-2.0+ +#ifndef __LINUX_GPIO_PROPERTY_H +#define __LINUX_GPIO_PROPERTY_H + +#include <dt-bindings/gpio/gpio.h> /* for GPIO_* flags */ +#include <linux/property.h> + +#define PROPERTY_ENTRY_GPIO(_name_, _chip_node_, _idx_, _flags_) \ + PROPERTY_ENTRY_REF(_name_, _chip_node_, _idx_, _flags_) + +#endif /* __LINUX_GPIO_PROPERTY_H */ diff --git a/include/linux/of_gpio.h b/include/linux/of_gpio.h index a5166eb9343752..6db627257a7ba1 100644 --- a/include/linux/of_gpio.h +++ b/include/linux/of_gpio.h @@ -34,7 +34,7 @@ enum of_gpio_flags { #ifdef CONFIG_OF_GPIO -#include <linux/kernel.h> +#include <linux/container_of.h> /* * OF GPIO chip for memory mapped banks |