diff options
Diffstat (limited to 'drivers/staging/iio/adc/ad7745.c')
| -rw-r--r-- | drivers/staging/iio/adc/ad7745.c | 674 |
1 files changed, 0 insertions, 674 deletions
diff --git a/drivers/staging/iio/adc/ad7745.c b/drivers/staging/iio/adc/ad7745.c deleted file mode 100644 index 4c13f26aa9ae3c..00000000000000 --- a/drivers/staging/iio/adc/ad7745.c +++ /dev/null @@ -1,674 +0,0 @@ -/* - * AD774X capacitive sensor driver supporting AD7745/6/7 - * - * Copyright 2010 Analog Devices Inc. - * - * Licensed under the GPL-2 or later. - */ - -#include <linux/interrupt.h> -#include <linux/gpio.h> -#include <linux/device.h> -#include <linux/kernel.h> -#include <linux/slab.h> -#include <linux/sysfs.h> -#include <linux/list.h> -#include <linux/i2c.h> - -#include "../iio.h" -#include "../sysfs.h" - -/* - * AD774X registers definition - */ - -#define AD774X_STATUS 0 -#define AD774X_STATUS_RDY (1 << 2) -#define AD774X_STATUS_RDYVT (1 << 1) -#define AD774X_STATUS_RDYCAP (1 << 0) -#define AD774X_CAP_DATA_HIGH 1 -#define AD774X_CAP_DATA_MID 2 -#define AD774X_CAP_DATA_LOW 3 -#define AD774X_VT_DATA_HIGH 4 -#define AD774X_VT_DATA_MID 5 -#define AD774X_VT_DATA_LOW 6 -#define AD774X_CAP_SETUP 7 -#define AD774X_VT_SETUP 8 -#define AD774X_EXEC_SETUP 9 -#define AD774X_CFG 10 -#define AD774X_CAPDACA 11 -#define AD774X_CAPDACB 12 -#define AD774X_CAPDAC_EN (1 << 7) -#define AD774X_CAP_OFFH 13 -#define AD774X_CAP_OFFL 14 -#define AD774X_CAP_GAINH 15 -#define AD774X_CAP_GAINL 16 -#define AD774X_VOLT_GAINH 17 -#define AD774X_VOLT_GAINL 18 - -#define AD774X_MAX_CONV_MODE 6 - -/* - * struct ad774x_chip_info - chip specifc information - */ - -struct ad774x_chip_info { - struct i2c_client *client; - bool inter; - u16 cap_offs; /* Capacitive offset */ - u16 cap_gain; /* Capacitive gain calibration */ - u16 volt_gain; /* Voltage gain calibration */ - u8 cap_setup; - u8 vt_setup; - u8 exec_setup; - - char *conversion_mode; -}; - -struct ad774x_conversion_mode { - char *name; - u8 reg_cfg; -}; - -static struct ad774x_conversion_mode -ad774x_conv_mode_table[AD774X_MAX_CONV_MODE] = { - { "idle", 0 }, - { "continuous-conversion", 1 }, - { "single-conversion", 2 }, - { "power-down", 3 }, - { "offset-calibration", 5 }, - { "gain-calibration", 6 }, -}; - -/* - * ad774x register access by I2C - */ - -static int ad774x_i2c_read(struct ad774x_chip_info *chip, u8 reg, u8 *data, int len) -{ - struct i2c_client *client = chip->client; - int ret; - - ret = i2c_master_send(client, ®, 1); - if (ret < 0) { - dev_err(&client->dev, "I2C write error\n"); - return ret; - } - - ret = i2c_master_recv(client, data, len); - if (ret < 0) { - dev_err(&client->dev, "I2C read error\n"); - return ret; - } - - return ret; -} - -static int ad774x_i2c_write(struct ad774x_chip_info *chip, u8 reg, u8 data) -{ - struct i2c_client *client = chip->client; - int ret; - - u8 tx[2] = { - reg, - data, - }; - - ret = i2c_master_send(client, tx, 2); - if (ret < 0) - dev_err(&client->dev, "I2C write error\n"); - - return ret; -} - -/* - * sysfs nodes - */ - -#define IIO_DEV_ATTR_AVAIL_CONVERSION_MODES(_show) \ - IIO_DEVICE_ATTR(available_conversion_modes, S_IRUGO, _show, NULL, 0) -#define IIO_DEV_ATTR_CONVERSION_MODE(_mode, _show, _store) \ - IIO_DEVICE_ATTR(conversion_mode, _mode, _show, _store, 0) -#define IIO_DEV_ATTR_CAP_SETUP(_mode, _show, _store) \ - IIO_DEVICE_ATTR(cap_setup, _mode, _show, _store, 0) -#define IIO_DEV_ATTR_VT_SETUP(_mode, _show, _store) \ - IIO_DEVICE_ATTR(in0_setup, _mode, _show, _store, 0) -#define IIO_DEV_ATTR_EXEC_SETUP(_mode, _show, _store) \ - IIO_DEVICE_ATTR(exec_setup, _mode, _show, _store, 0) -#define IIO_DEV_ATTR_VOLT_GAIN(_mode, _show, _store) \ - IIO_DEVICE_ATTR(in0_gain, _mode, _show, _store, 0) -#define IIO_DEV_ATTR_CAP_OFFS(_mode, _show, _store) \ - IIO_DEVICE_ATTR(cap_offs, _mode, _show, _store, 0) -#define IIO_DEV_ATTR_CAP_GAIN(_mode, _show, _store) \ - IIO_DEVICE_ATTR(cap_gain, _mode, _show, _store, 0) -#define IIO_DEV_ATTR_CAP_DATA(_show) \ - IIO_DEVICE_ATTR(cap0_raw, S_IRUGO, _show, NULL, 0) -#define IIO_DEV_ATTR_VT_DATA(_show) \ - IIO_DEVICE_ATTR(in0_raw, S_IRUGO, _show, NULL, 0) - -static ssize_t ad774x_show_conversion_modes(struct device *dev, - struct device_attribute *attr, - char *buf) -{ - int i; - int len = 0; - - for (i = 0; i < AD774X_MAX_CONV_MODE; i++) - len += sprintf(buf + len, "%s ", ad774x_conv_mode_table[i].name); - - len += sprintf(buf + len, "\n"); - - return len; -} - -static IIO_DEV_ATTR_AVAIL_CONVERSION_MODES(ad774x_show_conversion_modes); - -static ssize_t ad774x_show_conversion_mode(struct device *dev, - struct device_attribute *attr, - char *buf) -{ - struct iio_dev *dev_info = dev_get_drvdata(dev); - struct ad774x_chip_info *chip = iio_priv(dev_info); - - return sprintf(buf, "%s\n", chip->conversion_mode); -} - -static ssize_t ad774x_store_conversion_mode(struct device *dev, - struct device_attribute *attr, - const char *buf, - size_t len) -{ - struct iio_dev *dev_info = dev_get_drvdata(dev); - struct ad774x_chip_info *chip = iio_priv(dev_info); - u8 cfg; - int i; - - ad774x_i2c_read(chip, AD774X_CFG, &cfg, 1); - - for (i = 0; i < AD774X_MAX_CONV_MODE; i++) { - if (strncmp(buf, ad774x_conv_mode_table[i].name, - strlen(ad774x_conv_mode_table[i].name) - 1) == 0) { - chip->conversion_mode = ad774x_conv_mode_table[i].name; - cfg |= 0x18 | ad774x_conv_mode_table[i].reg_cfg; - ad774x_i2c_write(chip, AD774X_CFG, cfg); - return len; - } - } - - dev_err(dev, "not supported conversion mode\n"); - - return -EINVAL; -} - -static IIO_DEV_ATTR_CONVERSION_MODE(S_IRUGO | S_IWUSR, - ad774x_show_conversion_mode, - ad774x_store_conversion_mode); - -static ssize_t ad774x_show_dac_value(struct device *dev, - struct device_attribute *attr, - char *buf) -{ - struct iio_dev *dev_info = dev_get_drvdata(dev); - struct ad774x_chip_info *chip = iio_priv(dev_info); - struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); - u8 data; - - ad774x_i2c_read(chip, this_attr->address, &data, 1); - - return sprintf(buf, "%02x\n", data & 0x7F); -} - -static ssize_t ad774x_store_dac_value(struct device *dev, - struct device_attribute *attr, - const char *buf, - size_t len) -{ - struct iio_dev *dev_info = dev_get_drvdata(dev); - struct ad774x_chip_info *chip = iio_priv(dev_info); - struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); - unsigned long data; - int ret; - - ret = strict_strtoul(buf, 10, &data); - - if (!ret) { - ad774x_i2c_write(chip, this_attr->address, - (data ? AD774X_CAPDAC_EN : 0) | (data & 0x7F)); - return len; - } - - return -EINVAL; -} - -static IIO_DEVICE_ATTR(capdac0_raw, S_IRUGO | S_IWUSR, - ad774x_show_dac_value, - ad774x_store_dac_value, - AD774X_CAPDACA); - -static IIO_DEVICE_ATTR(capdac1_raw, S_IRUGO | S_IWUSR, - ad774x_show_dac_value, - ad774x_store_dac_value, - AD774X_CAPDACB); - -static ssize_t ad774x_show_cap_setup(struct device *dev, - struct device_attribute *attr, - char *buf) -{ - struct iio_dev *dev_info = dev_get_drvdata(dev); - struct ad774x_chip_info *chip = iio_priv(dev_info); - - return sprintf(buf, "0x%02x\n", chip->cap_setup); -} - -static ssize_t ad774x_store_cap_setup(struct device *dev, - struct device_attribute *attr, - const char *buf, - size_t len) -{ - struct iio_dev *dev_info = dev_get_drvdata(dev); - struct ad774x_chip_info *chip = iio_priv(dev_info); - unsigned long data; - int ret; - - ret = strict_strtoul(buf, 10, &data); - - if ((!ret) && (data < 0x100)) { - ad774x_i2c_write(chip, AD774X_CAP_SETUP, data); - chip->cap_setup = data; - return len; - } - - return -EINVAL; -} - -static IIO_DEV_ATTR_CAP_SETUP(S_IRUGO | S_IWUSR, - ad774x_show_cap_setup, - ad774x_store_cap_setup); - -static ssize_t ad774x_show_vt_setup(struct device *dev, - struct device_attribute *attr, - char *buf) -{ - struct iio_dev *dev_info = dev_get_drvdata(dev); - struct ad774x_chip_info *chip = iio_priv(dev_info); - - return sprintf(buf, "0x%02x\n", chip->vt_setup); -} - -static ssize_t ad774x_store_vt_setup(struct device *dev, - struct device_attribute *attr, - const char *buf, - size_t len) -{ - struct iio_dev *dev_info = dev_get_drvdata(dev); - struct ad774x_chip_info *chip = iio_priv(dev_info); - unsigned long data; - int ret; - - ret = strict_strtoul(buf, 10, &data); - - if ((!ret) && (data < 0x100)) { - ad774x_i2c_write(chip, AD774X_VT_SETUP, data); - chip->vt_setup = data; - return len; - } - - return -EINVAL; -} - -static IIO_DEV_ATTR_VT_SETUP(S_IRUGO | S_IWUSR, - ad774x_show_vt_setup, - ad774x_store_vt_setup); - -static ssize_t ad774x_show_exec_setup(struct device *dev, - struct device_attribute *attr, - char *buf) -{ - struct iio_dev *dev_info = dev_get_drvdata(dev); - struct ad774x_chip_info *chip = iio_priv(dev_info); - - return sprintf(buf, "0x%02x\n", chip->exec_setup); -} - -static ssize_t ad774x_store_exec_setup(struct device *dev, - struct device_attribute *attr, - const char *buf, - size_t len) -{ - struct iio_dev *dev_info = dev_get_drvdata(dev); - struct ad774x_chip_info *chip = iio_priv(dev_info); - unsigned long data; - int ret; - - ret = strict_strtoul(buf, 10, &data); - - if ((!ret) && (data < 0x100)) { - ad774x_i2c_write(chip, AD774X_EXEC_SETUP, data); - chip->exec_setup = data; - return len; - } - - return -EINVAL; -} - -static IIO_DEV_ATTR_EXEC_SETUP(S_IRUGO | S_IWUSR, - ad774x_show_exec_setup, - ad774x_store_exec_setup); - -static ssize_t ad774x_show_volt_gain(struct device *dev, - struct device_attribute *attr, - char *buf) -{ - struct iio_dev *dev_info = dev_get_drvdata(dev); - struct ad774x_chip_info *chip = iio_priv(dev_info); - - return sprintf(buf, "%d\n", chip->volt_gain); -} - -static ssize_t ad774x_store_volt_gain(struct device *dev, - struct device_attribute *attr, - const char *buf, - size_t len) -{ - struct iio_dev *dev_info = dev_get_drvdata(dev); - struct ad774x_chip_info *chip = iio_priv(dev_info); - unsigned long data; - int ret; - - ret = strict_strtoul(buf, 10, &data); - - if ((!ret) && (data < 0x10000)) { - ad774x_i2c_write(chip, AD774X_VOLT_GAINH, data >> 8); - ad774x_i2c_write(chip, AD774X_VOLT_GAINL, data); - chip->volt_gain = data; - return len; - } - - return -EINVAL; -} - -static IIO_DEV_ATTR_VOLT_GAIN(S_IRUGO | S_IWUSR, - ad774x_show_volt_gain, - ad774x_store_volt_gain); - -static ssize_t ad774x_show_cap_data(struct device *dev, - struct device_attribute *attr, - char *buf) -{ - struct iio_dev *dev_info = dev_get_drvdata(dev); - struct ad774x_chip_info *chip = iio_priv(dev_info); - unsigned long data; - char tmp[3]; - - ad774x_i2c_read(chip, AD774X_CAP_DATA_HIGH, tmp, 3); - data = ((int)tmp[0] << 16) | ((int)tmp[1] << 8) | (int)tmp[2]; - - return sprintf(buf, "%ld\n", data); -} - -static IIO_DEV_ATTR_CAP_DATA(ad774x_show_cap_data); - -static ssize_t ad774x_show_vt_data(struct device *dev, - struct device_attribute *attr, - char *buf) -{ - struct iio_dev *dev_info = dev_get_drvdata(dev); - struct ad774x_chip_info *chip = iio_priv(dev_info); - unsigned long data; - char tmp[3]; - - ad774x_i2c_read(chip, AD774X_VT_DATA_HIGH, tmp, 3); - data = ((int)tmp[0] << 16) | ((int)tmp[1] << 8) | (int)tmp[2]; - - return sprintf(buf, "%ld\n", data); -} - -static IIO_DEV_ATTR_VT_DATA(ad774x_show_vt_data); - -static ssize_t ad774x_show_cap_offs(struct device *dev, - struct device_attribute *attr, - char *buf) -{ - struct iio_dev *dev_info = dev_get_drvdata(dev); - struct ad774x_chip_info *chip = iio_priv(dev_info); - - return sprintf(buf, "%d\n", chip->cap_offs); -} - -static ssize_t ad774x_store_cap_offs(struct device *dev, - struct device_attribute *attr, - const char *buf, - size_t len) -{ - struct iio_dev *dev_info = dev_get_drvdata(dev); - struct ad774x_chip_info *chip = iio_priv(dev_info); - unsigned long data; - int ret; - - ret = strict_strtoul(buf, 10, &data); - - if ((!ret) && (data < 0x10000)) { - ad774x_i2c_write(chip, AD774X_CAP_OFFH, data >> 8); - ad774x_i2c_write(chip, AD774X_CAP_OFFL, data); - chip->cap_offs = data; - return len; - } - - return -EINVAL; -} - -static IIO_DEV_ATTR_CAP_OFFS(S_IRUGO | S_IWUSR, - ad774x_show_cap_offs, - ad774x_store_cap_offs); - -static ssize_t ad774x_show_cap_gain(struct device *dev, - struct device_attribute *attr, - char *buf) -{ - struct iio_dev *dev_info = dev_get_drvdata(dev); - struct ad774x_chip_info *chip = iio_priv(dev_info); - - return sprintf(buf, "%d\n", chip->cap_gain); -} - -static ssize_t ad774x_store_cap_gain(struct device *dev, - struct device_attribute *attr, - const char *buf, - size_t len) -{ - struct iio_dev *dev_info = dev_get_drvdata(dev); - struct ad774x_chip_info *chip = iio_priv(dev_info); - unsigned long data; - int ret; - - ret = strict_strtoul(buf, 10, &data); - - if ((!ret) && (data < 0x10000)) { - ad774x_i2c_write(chip, AD774X_CAP_GAINH, data >> 8); - ad774x_i2c_write(chip, AD774X_CAP_GAINL, data); - chip->cap_gain = data; - return len; - } - - return -EINVAL; -} - -static IIO_DEV_ATTR_CAP_GAIN(S_IRUGO | S_IWUSR, - ad774x_show_cap_gain, - ad774x_store_cap_gain); - -static struct attribute *ad774x_attributes[] = { - &iio_dev_attr_available_conversion_modes.dev_attr.attr, - &iio_dev_attr_conversion_mode.dev_attr.attr, - &iio_dev_attr_cap_setup.dev_attr.attr, - &iio_dev_attr_in0_setup.dev_attr.attr, - &iio_dev_attr_exec_setup.dev_attr.attr, - &iio_dev_attr_cap_offs.dev_attr.attr, - &iio_dev_attr_cap_gain.dev_attr.attr, - &iio_dev_attr_in0_gain.dev_attr.attr, - &iio_dev_attr_in0_raw.dev_attr.attr, - &iio_dev_attr_cap0_raw.dev_attr.attr, - &iio_dev_attr_capdac0_raw.dev_attr.attr, - &iio_dev_attr_capdac1_raw.dev_attr.attr, - NULL, -}; - -static const struct attribute_group ad774x_attribute_group = { - .attrs = ad774x_attributes, -}; - -/* - * data ready events - */ - -#define IIO_EVENT_CODE_CAP_RDY 0 -#define IIO_EVENT_CODE_VT_RDY 1 - -#define IIO_EVENT_ATTR_CAP_RDY_SH(_evlist, _show, _store, _mask) \ - IIO_EVENT_ATTR_SH(cap_rdy, _evlist, _show, _store, _mask) - -#define IIO_EVENT_ATTR_VT_RDY_SH(_evlist, _show, _store, _mask) \ - IIO_EVENT_ATTR_SH(vt_rdy, _evlist, _show, _store, _mask) - -static irqreturn_t ad774x_event_handler(int irq, void *private) -{ - struct iio_dev *indio_dev = private; - struct ad774x_chip_info *chip = iio_priv(indio_dev); - u8 int_status; - - ad774x_i2c_read(chip, AD774X_STATUS, &int_status, 1); - - if (int_status & AD774X_STATUS_RDYCAP) - iio_push_event(indio_dev, 0, - IIO_EVENT_CODE_CAP_RDY, - iio_get_time_ns()); - - if (int_status & AD774X_STATUS_RDYVT) - iio_push_event(indio_dev, 0, - IIO_EVENT_CODE_VT_RDY, - iio_get_time_ns()); - - return IRQ_HANDLED; -} - -static IIO_CONST_ATTR(cap_rdy_en, "1"); -static IIO_CONST_ATTR(vt_rdy_en, "1"); - -static struct attribute *ad774x_event_attributes[] = { - &iio_const_attr_cap_rdy_en.dev_attr.attr, - &iio_const_attr_vt_rdy_en.dev_attr.attr, - NULL, -}; - -static struct attribute_group ad774x_event_attribute_group = { - .attrs = ad774x_event_attributes, -}; - -static const struct iio_info ad774x_info = { - .attrs = &ad774x_event_attribute_group, - .event_attrs = &ad774x_event_attribute_group, - .num_interrupt_lines = 1, - .driver_module = THIS_MODULE, -}; -/* - * device probe and remove - */ - -static int __devinit ad774x_probe(struct i2c_client *client, - const struct i2c_device_id *id) -{ - int ret = 0, regdone = 0; - struct ad774x_chip_info *chip; - struct iio_dev *indio_dev; - - indio_dev = iio_allocate_device(sizeof(*chip)); - if (indio_dev == NULL) { - ret = -ENOMEM; - goto error_ret; - } - chip = iio_priv(indio_dev); - /* this is only used for device removal purposes */ - i2c_set_clientdata(client, indio_dev); - - chip->client = client; - - /* Establish that the iio_dev is a child of the i2c device */ - indio_dev->name = id->name; - indio_dev->dev.parent = &client->dev; - indio_dev->info = &ad774x_info; - indio_dev->modes = INDIO_DIRECT_MODE; - - ret = iio_device_register(indio_dev); - if (ret) - goto error_free_dev; - regdone = 1; - - if (client->irq) { - ret = request_threaded_irq(client->irq, - NULL, - &ad774x_event_handler, - IRQF_TRIGGER_FALLING, - "ad774x", - indio_dev); - if (ret) - goto error_free_dev; - } - - dev_err(&client->dev, "%s capacitive sensor registered, irq: %d\n", id->name, client->irq); - - return 0; - -error_free_dev: - if (regdone) - free_irq(client->irq, indio_dev); - else - iio_free_device(indio_dev); -error_ret: - return ret; -} - -static int __devexit ad774x_remove(struct i2c_client *client) -{ - struct iio_dev *indio_dev = i2c_get_clientdata(client); - - if (client->irq) - free_irq(client->irq, indio_dev); - iio_device_unregister(indio_dev); - - return 0; -} - -static const struct i2c_device_id ad774x_id[] = { - { "ad7745", 0 }, - { "ad7746", 0 }, - { "ad7747", 0 }, - {} -}; - -MODULE_DEVICE_TABLE(i2c, ad774x_id); - -static struct i2c_driver ad774x_driver = { - .driver = { - .name = "ad774x", - }, - .probe = ad774x_probe, - .remove = __devexit_p(ad774x_remove), - .id_table = ad774x_id, -}; - -static __init int ad774x_init(void) -{ - return i2c_add_driver(&ad774x_driver); -} - -static __exit void ad774x_exit(void) -{ - i2c_del_driver(&ad774x_driver); -} - -MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>"); -MODULE_DESCRIPTION("Analog Devices ad7745/6/7 capacitive sensor driver"); -MODULE_LICENSE("GPL v2"); - -module_init(ad774x_init); -module_exit(ad774x_exit); |