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/*
* Copyright 2007-2009 Freescale Semiconductor, Inc. All Rights Reserved.
*/
/*
* The code contained herein is licensed under the GNU General Public
* License. You may obtain a copy of the GNU General Public License
* Version 2 or later at the following locations:
*
* http://www.opensource.org/licenses/gpl-license.html
* http://www.gnu.org/copyleft/gpl.html
*/
/*!
* @file mxc_ts.c
*
* @brief Driver for the Freescale Semiconductor MXC touchscreen.
*
* The touchscreen driver is designed as a standard input driver which is a
* wrapper over low level PMIC driver. Most of the hardware configuration and
* touchscreen functionality is implemented in the low level PMIC driver. During
* initialization, this driver creates a kernel thread. This thread then calls
* PMIC driver to obtain touchscreen values continously. These values are then
* passed to the input susbsystem.
*
* @ingroup touchscreen
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/sched.h>
#include <linux/input.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/freezer.h>
#include <linux/pmic_external.h>
#include <linux/pmic_adc.h>
#define MXC_TS_NAME "mxc_ts"
static struct input_dev *mxc_inputdev = NULL;
static u32 input_ts_installed;
static int ts_thread(void *arg)
{
int j1=0, j2=0, j3=0, j4=0;
t_touch_screen ts_sample;
s32 wait = 0;
daemonize("mxc_ts");
while (input_ts_installed) {
try_to_freeze();
memset(&ts_sample, 0, sizeof(t_touch_screen));
j3 = jiffies;
if (0 != pmic_adc_get_touch_sample(&ts_sample, !wait)){
printk("ttd: pmic_adc_get_touch_sample() RETURNS NONZERO\n");
continue;
}
j4 = jiffies;
// printk("ts_thread: pmic_adc_get_touch_sample() took %d jiffies\n", j4 - j3);
if (!(ts_sample.contact_resistance || wait)){
printk("ttd: continue: res=%d, wait=%d\n", ts_sample.contact_resistance, wait);
continue;
}
printk("ttd: ts_thread sending event: abs x=%d, abx y = %d, resistance = %d\n",
ts_sample.x_position,
ts_sample.y_position,
ts_sample.contact_resistance
);
j1 = jiffies;
input_report_abs(mxc_inputdev, ABS_X, ts_sample.x_position);
input_report_abs(mxc_inputdev, ABS_Y, ts_sample.y_position);
input_report_abs(mxc_inputdev, ABS_PRESSURE,
ts_sample.contact_resistance);
input_sync(mxc_inputdev);
j2 = jiffies;
wait = ts_sample.contact_resistance;
j1 = jiffies;
msleep(20);
j2 = jiffies;
}
return 0;
}
static int __init mxc_ts_init(void)
{
int retval;
if (!is_pmic_adc_ready())
return -ENODEV;
mxc_inputdev = input_allocate_device();
if (!mxc_inputdev) {
printk(KERN_ERR
"mxc_ts_init: not enough memory for input device\n");
return -ENOMEM;
}
mxc_inputdev->name = MXC_TS_NAME;
mxc_inputdev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
mxc_inputdev->keybit[BIT_WORD(BTN_TOUCH)] |= BIT_MASK(BTN_TOUCH);
mxc_inputdev->absbit[0] =
BIT_MASK(ABS_X) | BIT_MASK(ABS_Y) | BIT_MASK(ABS_PRESSURE);
retval = input_register_device(mxc_inputdev);
if (retval < 0) {
input_free_device(mxc_inputdev);
return retval;
}
input_ts_installed = 1;
kernel_thread(ts_thread, NULL, CLONE_VM | CLONE_FS);
printk("mxc input touchscreen loaded\n");
return 0;
}
static void __exit mxc_ts_exit(void)
{
input_ts_installed = 0;
input_unregister_device(mxc_inputdev);
if (mxc_inputdev) {
input_free_device(mxc_inputdev);
mxc_inputdev = NULL;
}
}
late_initcall(mxc_ts_init);
module_exit(mxc_ts_exit);
MODULE_DESCRIPTION("MXC input touchscreen driver");
MODULE_AUTHOR("Freescale Semiconductor, Inc.");
MODULE_LICENSE("GPL");
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