diff options
Diffstat (limited to 'drivers/input/touchscreen/jornada720_ts.c')
| -rw-r--r-- | drivers/input/touchscreen/jornada720_ts.c | 173 |
1 files changed, 173 insertions, 0 deletions
diff --git a/drivers/input/touchscreen/jornada720_ts.c b/drivers/input/touchscreen/jornada720_ts.c new file mode 100644 index 00000000000000..fd24ceead7709f --- /dev/null +++ b/drivers/input/touchscreen/jornada720_ts.c @@ -0,0 +1,173 @@ +/* + * drivers/input/touchscreen/jornada720_ts.c + * + * Jornada 720 touchscreen interface + * + * Copyright (C) 2006 Filip Zyzniewski <filip.zyzniewski@tefnet.pl> + * Copyright (C) 2004 Alex Lange <chicken@handhelds.org> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + */ + +#include <linux/input.h> +#include <linux/module.h> +#include <linux/kernel.h> +#include <linux/init.h> +#include <linux/interrupt.h> +#include <linux/device.h> + +#include <asm/hardware.h> +#include <asm/arch/jornada720_mcu.h> + +MODULE_AUTHOR("Alex Lange <chicken@handhelds.org>"); +MODULE_DESCRIPTION("Jornada 720 touchscreen driver"); +MODULE_LICENSE("GPL"); + +/* + * HP Documentation referred in this file: + * http://www.jlime.com/downloads/development/docs/jornada7xx/jornada720.txt + */ + +static struct input_dev *dev; + +static char jornada720_ts_name[] = "Jornada 720 touchscreen"; + + +static irqreturn_t jornada720_ts_interrupt(int irq, void *dev_id) +{ + int X[3], Y[3], high_x, high_y, x, y; + + /* check if pen is up (line 264 of HP's doc) */ + if(GPLR & GPIO_GPIO(9)) { + /* report pen up */ + input_report_key(dev, BTN_TOUCH, 0); + input_report_abs(dev, ABS_PRESSURE, 0); + input_sync(dev); + + return IRQ_HANDLED; + } + + /* + * read x & y data from mcu interface and + * pass it on (line 265 of HP's doc) + */ + if(jornada720_mcu_start(jornada720_mcu_GetTouchSamples)) { + jornada720_mcu_end(); + return IRQ_HANDLED; + } + + /* + * beware: HP's doc specifies incorrect order of sample + * bytes, MSBs for X and Y are the last two ones. + */ + + /* LSBs for X (line 272 of HP's doc */ + X[0] = jornada720_mcu_read(); + X[1] = jornada720_mcu_read(); + X[2] = jornada720_mcu_read(); + + /* LSBs for Y (line 276 of HP's doc */ + Y[0] = jornada720_mcu_read(); + Y[1] = jornada720_mcu_read(); + Y[2] = jornada720_mcu_read(); + + /* MSBs for X (line 275 of HP's doc */ + high_x = jornada720_mcu_read(); + + /* MSBs for Y (line 279 of HP's doc) */ + high_y = jornada720_mcu_read(); + + jornada720_mcu_end(); + + /* calculating actual values (line 281 of HP's doc) */ + X[0] |= (high_x & 3) << 8; + X[1] |= (high_x & 0xc) << 6; + X[2] |= (high_x & 0x30) << 4; + + Y[0] |= (high_y & 3) << 8; + Y[1] |= (high_y & 0xc) << 6; + Y[2] |= (high_y & 0x30) << 4; + + /* simple averaging filter */ + x = (X[0] + X[1] + X[2])/3; + y = (Y[0] + Y[1] + Y[2])/3; + + /* report pen down */ + input_report_key(dev, BTN_TOUCH, 1); + input_report_abs(dev, ABS_X, x); + input_report_abs(dev, ABS_Y, y); + input_report_abs(dev, ABS_PRESSURE, 1); + input_sync(dev); + + return IRQ_HANDLED; + +} + + +static int jornada720_ts_probe(struct device *_dev) +{ + int ret; + + dev = input_allocate_device(); + if (!dev) + return -ENOMEM; + + dev->evbit[0] = BIT(EV_KEY) | BIT(EV_ABS); + dev->absbit[0] = BIT(ABS_X) | BIT(ABS_Y) | BIT(ABS_PRESSURE); + dev->keybit[LONG(BTN_TOUCH)] = BIT(BTN_TOUCH); + + dev->absmin[ABS_X] = 270; dev->absmin[ABS_Y] = 180; + dev->absmax[ABS_X] = 3900; dev->absmax[ABS_Y] = 3700; + + dev->name = jornada720_ts_name; + + /* + * touchscreen is on GPIO9 (Line 263 of HP's doc. It says we should + * care for falling edge, but in fact we need a rising edge.) + */ + ret = request_irq(IRQ_GPIO9, + jornada720_ts_interrupt, + IRQF_DISABLED | IRQF_TRIGGER_RISING, + jornada720_ts_name, dev); + if (ret) { + printk("Unable to grab IRQ for %s: %d\n", jornada720_ts_name, ret); + input_free_device(dev); + return ret; + } + + input_register_device(dev); + + return 0; +} + + +static int jornada720_ts_remove(struct device *_dev) +{ + free_irq(IRQ_GPIO9, dev); + input_unregister_device(dev); + return 0; +} + +static struct device_driver jornada720_ts_driver = { + .name = jornada720_mcu_bus_id_ts, + .bus = &jornada720_mcu_bus_type, + .probe = jornada720_ts_probe, + .remove = jornada720_ts_remove, + .owner = THIS_MODULE +}; + +static int __init jornada720_ts_init(void) +{ + return driver_register(&jornada720_ts_driver); +} + +static void __exit jornada720_ts_exit(void) +{ + driver_unregister(&jornada720_ts_driver); +} + +module_init(jornada720_ts_init); +module_exit(jornada720_ts_exit); |