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/*
* 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);
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