448 lines
11 KiB
C
448 lines
11 KiB
C
/*
|
|
* Touchscreen driver for UCB1x00-based touchscreens
|
|
*
|
|
* Copyright (C) 2001 Russell King, All Rights Reserved.
|
|
* Copyright (C) 2005 Pavel Machek
|
|
*
|
|
* 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.
|
|
*
|
|
* 21-Jan-2002 <jco@ict.es> :
|
|
*
|
|
* Added support for synchronous A/D mode. This mode is useful to
|
|
* avoid noise induced in the touchpanel by the LCD, provided that
|
|
* the UCB1x00 has a valid LCD sync signal routed to its ADCSYNC pin.
|
|
* It is important to note that the signal connected to the ADCSYNC
|
|
* pin should provide pulses even when the LCD is blanked, otherwise
|
|
* a pen touch needed to unblank the LCD will never be read.
|
|
*/
|
|
#include <linux/module.h>
|
|
#include <linux/moduleparam.h>
|
|
#include <linux/init.h>
|
|
#include <linux/smp.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/completion.h>
|
|
#include <linux/delay.h>
|
|
#include <linux/string.h>
|
|
#include <linux/input.h>
|
|
#include <linux/device.h>
|
|
#include <linux/freezer.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/kthread.h>
|
|
#include <linux/mfd/ucb1x00.h>
|
|
|
|
#include <mach/dma.h>
|
|
#include <mach/collie.h>
|
|
#include <asm/mach-types.h>
|
|
|
|
|
|
|
|
struct ucb1x00_ts {
|
|
struct input_dev *idev;
|
|
struct ucb1x00 *ucb;
|
|
|
|
wait_queue_head_t irq_wait;
|
|
struct task_struct *rtask;
|
|
u16 x_res;
|
|
u16 y_res;
|
|
|
|
unsigned int restart:1;
|
|
unsigned int adcsync:1;
|
|
};
|
|
|
|
static int adcsync;
|
|
|
|
static inline void ucb1x00_ts_evt_add(struct ucb1x00_ts *ts, u16 pressure, u16 x, u16 y)
|
|
{
|
|
struct input_dev *idev = ts->idev;
|
|
|
|
input_report_abs(idev, ABS_X, x);
|
|
input_report_abs(idev, ABS_Y, y);
|
|
input_report_abs(idev, ABS_PRESSURE, pressure);
|
|
input_report_key(idev, BTN_TOUCH, 1);
|
|
input_sync(idev);
|
|
}
|
|
|
|
static inline void ucb1x00_ts_event_release(struct ucb1x00_ts *ts)
|
|
{
|
|
struct input_dev *idev = ts->idev;
|
|
|
|
input_report_abs(idev, ABS_PRESSURE, 0);
|
|
input_report_key(idev, BTN_TOUCH, 0);
|
|
input_sync(idev);
|
|
}
|
|
|
|
/*
|
|
* Switch to interrupt mode.
|
|
*/
|
|
static inline void ucb1x00_ts_mode_int(struct ucb1x00_ts *ts)
|
|
{
|
|
ucb1x00_reg_write(ts->ucb, UCB_TS_CR,
|
|
UCB_TS_CR_TSMX_POW | UCB_TS_CR_TSPX_POW |
|
|
UCB_TS_CR_TSMY_GND | UCB_TS_CR_TSPY_GND |
|
|
UCB_TS_CR_MODE_INT);
|
|
}
|
|
|
|
/*
|
|
* Switch to pressure mode, and read pressure. We don't need to wait
|
|
* here, since both plates are being driven.
|
|
*/
|
|
static inline unsigned int ucb1x00_ts_read_pressure(struct ucb1x00_ts *ts)
|
|
{
|
|
if (machine_is_collie()) {
|
|
ucb1x00_io_write(ts->ucb, COLLIE_TC35143_GPIO_TBL_CHK, 0);
|
|
ucb1x00_reg_write(ts->ucb, UCB_TS_CR,
|
|
UCB_TS_CR_TSPX_POW | UCB_TS_CR_TSMX_POW |
|
|
UCB_TS_CR_MODE_POS | UCB_TS_CR_BIAS_ENA);
|
|
|
|
udelay(55);
|
|
|
|
return ucb1x00_adc_read(ts->ucb, UCB_ADC_INP_AD2, ts->adcsync);
|
|
} else {
|
|
ucb1x00_reg_write(ts->ucb, UCB_TS_CR,
|
|
UCB_TS_CR_TSMX_POW | UCB_TS_CR_TSPX_POW |
|
|
UCB_TS_CR_TSMY_GND | UCB_TS_CR_TSPY_GND |
|
|
UCB_TS_CR_MODE_PRES | UCB_TS_CR_BIAS_ENA);
|
|
|
|
return ucb1x00_adc_read(ts->ucb, UCB_ADC_INP_TSPY, ts->adcsync);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Switch to X position mode and measure Y plate. We switch the plate
|
|
* configuration in pressure mode, then switch to position mode. This
|
|
* gives a faster response time. Even so, we need to wait about 55us
|
|
* for things to stabilise.
|
|
*/
|
|
static inline unsigned int ucb1x00_ts_read_xpos(struct ucb1x00_ts *ts)
|
|
{
|
|
if (machine_is_collie())
|
|
ucb1x00_io_write(ts->ucb, 0, COLLIE_TC35143_GPIO_TBL_CHK);
|
|
else {
|
|
ucb1x00_reg_write(ts->ucb, UCB_TS_CR,
|
|
UCB_TS_CR_TSMX_GND | UCB_TS_CR_TSPX_POW |
|
|
UCB_TS_CR_MODE_PRES | UCB_TS_CR_BIAS_ENA);
|
|
ucb1x00_reg_write(ts->ucb, UCB_TS_CR,
|
|
UCB_TS_CR_TSMX_GND | UCB_TS_CR_TSPX_POW |
|
|
UCB_TS_CR_MODE_PRES | UCB_TS_CR_BIAS_ENA);
|
|
}
|
|
ucb1x00_reg_write(ts->ucb, UCB_TS_CR,
|
|
UCB_TS_CR_TSMX_GND | UCB_TS_CR_TSPX_POW |
|
|
UCB_TS_CR_MODE_POS | UCB_TS_CR_BIAS_ENA);
|
|
|
|
udelay(55);
|
|
|
|
return ucb1x00_adc_read(ts->ucb, UCB_ADC_INP_TSPY, ts->adcsync);
|
|
}
|
|
|
|
/*
|
|
* Switch to Y position mode and measure X plate. We switch the plate
|
|
* configuration in pressure mode, then switch to position mode. This
|
|
* gives a faster response time. Even so, we need to wait about 55us
|
|
* for things to stabilise.
|
|
*/
|
|
static inline unsigned int ucb1x00_ts_read_ypos(struct ucb1x00_ts *ts)
|
|
{
|
|
if (machine_is_collie())
|
|
ucb1x00_io_write(ts->ucb, 0, COLLIE_TC35143_GPIO_TBL_CHK);
|
|
else {
|
|
ucb1x00_reg_write(ts->ucb, UCB_TS_CR,
|
|
UCB_TS_CR_TSMY_GND | UCB_TS_CR_TSPY_POW |
|
|
UCB_TS_CR_MODE_PRES | UCB_TS_CR_BIAS_ENA);
|
|
ucb1x00_reg_write(ts->ucb, UCB_TS_CR,
|
|
UCB_TS_CR_TSMY_GND | UCB_TS_CR_TSPY_POW |
|
|
UCB_TS_CR_MODE_PRES | UCB_TS_CR_BIAS_ENA);
|
|
}
|
|
|
|
ucb1x00_reg_write(ts->ucb, UCB_TS_CR,
|
|
UCB_TS_CR_TSMY_GND | UCB_TS_CR_TSPY_POW |
|
|
UCB_TS_CR_MODE_POS | UCB_TS_CR_BIAS_ENA);
|
|
|
|
udelay(55);
|
|
|
|
return ucb1x00_adc_read(ts->ucb, UCB_ADC_INP_TSPX, ts->adcsync);
|
|
}
|
|
|
|
/*
|
|
* Switch to X plate resistance mode. Set MX to ground, PX to
|
|
* supply. Measure current.
|
|
*/
|
|
static inline unsigned int ucb1x00_ts_read_xres(struct ucb1x00_ts *ts)
|
|
{
|
|
ucb1x00_reg_write(ts->ucb, UCB_TS_CR,
|
|
UCB_TS_CR_TSMX_GND | UCB_TS_CR_TSPX_POW |
|
|
UCB_TS_CR_MODE_PRES | UCB_TS_CR_BIAS_ENA);
|
|
return ucb1x00_adc_read(ts->ucb, 0, ts->adcsync);
|
|
}
|
|
|
|
/*
|
|
* Switch to Y plate resistance mode. Set MY to ground, PY to
|
|
* supply. Measure current.
|
|
*/
|
|
static inline unsigned int ucb1x00_ts_read_yres(struct ucb1x00_ts *ts)
|
|
{
|
|
ucb1x00_reg_write(ts->ucb, UCB_TS_CR,
|
|
UCB_TS_CR_TSMY_GND | UCB_TS_CR_TSPY_POW |
|
|
UCB_TS_CR_MODE_PRES | UCB_TS_CR_BIAS_ENA);
|
|
return ucb1x00_adc_read(ts->ucb, 0, ts->adcsync);
|
|
}
|
|
|
|
static inline int ucb1x00_ts_pen_down(struct ucb1x00_ts *ts)
|
|
{
|
|
unsigned int val = ucb1x00_reg_read(ts->ucb, UCB_TS_CR);
|
|
|
|
if (machine_is_collie())
|
|
return (!(val & (UCB_TS_CR_TSPX_LOW)));
|
|
else
|
|
return (val & (UCB_TS_CR_TSPX_LOW | UCB_TS_CR_TSMX_LOW));
|
|
}
|
|
|
|
/*
|
|
* This is a RT kernel thread that handles the ADC accesses
|
|
* (mainly so we can use semaphores in the UCB1200 core code
|
|
* to serialise accesses to the ADC).
|
|
*/
|
|
static int ucb1x00_thread(void *_ts)
|
|
{
|
|
struct ucb1x00_ts *ts = _ts;
|
|
DECLARE_WAITQUEUE(wait, current);
|
|
int valid = 0;
|
|
|
|
set_freezable();
|
|
add_wait_queue(&ts->irq_wait, &wait);
|
|
while (!kthread_should_stop()) {
|
|
unsigned int x, y, p;
|
|
signed long timeout;
|
|
|
|
ts->restart = 0;
|
|
|
|
ucb1x00_adc_enable(ts->ucb);
|
|
|
|
x = ucb1x00_ts_read_xpos(ts);
|
|
y = ucb1x00_ts_read_ypos(ts);
|
|
p = ucb1x00_ts_read_pressure(ts);
|
|
|
|
/*
|
|
* Switch back to interrupt mode.
|
|
*/
|
|
ucb1x00_ts_mode_int(ts);
|
|
ucb1x00_adc_disable(ts->ucb);
|
|
|
|
msleep(10);
|
|
|
|
ucb1x00_enable(ts->ucb);
|
|
|
|
|
|
if (ucb1x00_ts_pen_down(ts)) {
|
|
set_current_state(TASK_INTERRUPTIBLE);
|
|
|
|
ucb1x00_enable_irq(ts->ucb, UCB_IRQ_TSPX, machine_is_collie() ? UCB_RISING : UCB_FALLING);
|
|
ucb1x00_disable(ts->ucb);
|
|
|
|
/*
|
|
* If we spat out a valid sample set last time,
|
|
* spit out a "pen off" sample here.
|
|
*/
|
|
if (valid) {
|
|
ucb1x00_ts_event_release(ts);
|
|
valid = 0;
|
|
}
|
|
|
|
timeout = MAX_SCHEDULE_TIMEOUT;
|
|
} else {
|
|
ucb1x00_disable(ts->ucb);
|
|
|
|
/*
|
|
* Filtering is policy. Policy belongs in user
|
|
* space. We therefore leave it to user space
|
|
* to do any filtering they please.
|
|
*/
|
|
if (!ts->restart) {
|
|
ucb1x00_ts_evt_add(ts, p, x, y);
|
|
valid = 1;
|
|
}
|
|
|
|
set_current_state(TASK_INTERRUPTIBLE);
|
|
timeout = HZ / 100;
|
|
}
|
|
|
|
try_to_freeze();
|
|
|
|
schedule_timeout(timeout);
|
|
}
|
|
|
|
remove_wait_queue(&ts->irq_wait, &wait);
|
|
|
|
ts->rtask = NULL;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* We only detect touch screen _touches_ with this interrupt
|
|
* handler, and even then we just schedule our task.
|
|
*/
|
|
static void ucb1x00_ts_irq(int idx, void *id)
|
|
{
|
|
struct ucb1x00_ts *ts = id;
|
|
|
|
ucb1x00_disable_irq(ts->ucb, UCB_IRQ_TSPX, UCB_FALLING);
|
|
wake_up(&ts->irq_wait);
|
|
}
|
|
|
|
static int ucb1x00_ts_open(struct input_dev *idev)
|
|
{
|
|
struct ucb1x00_ts *ts = input_get_drvdata(idev);
|
|
int ret = 0;
|
|
|
|
BUG_ON(ts->rtask);
|
|
|
|
init_waitqueue_head(&ts->irq_wait);
|
|
ret = ucb1x00_hook_irq(ts->ucb, UCB_IRQ_TSPX, ucb1x00_ts_irq, ts);
|
|
if (ret < 0)
|
|
goto out;
|
|
|
|
/*
|
|
* If we do this at all, we should allow the user to
|
|
* measure and read the X and Y resistance at any time.
|
|
*/
|
|
ucb1x00_adc_enable(ts->ucb);
|
|
ts->x_res = ucb1x00_ts_read_xres(ts);
|
|
ts->y_res = ucb1x00_ts_read_yres(ts);
|
|
ucb1x00_adc_disable(ts->ucb);
|
|
|
|
ts->rtask = kthread_run(ucb1x00_thread, ts, "ktsd");
|
|
if (!IS_ERR(ts->rtask)) {
|
|
ret = 0;
|
|
} else {
|
|
ucb1x00_free_irq(ts->ucb, UCB_IRQ_TSPX, ts);
|
|
ts->rtask = NULL;
|
|
ret = -EFAULT;
|
|
}
|
|
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Release touchscreen resources. Disable IRQs.
|
|
*/
|
|
static void ucb1x00_ts_close(struct input_dev *idev)
|
|
{
|
|
struct ucb1x00_ts *ts = input_get_drvdata(idev);
|
|
|
|
if (ts->rtask)
|
|
kthread_stop(ts->rtask);
|
|
|
|
ucb1x00_enable(ts->ucb);
|
|
ucb1x00_free_irq(ts->ucb, UCB_IRQ_TSPX, ts);
|
|
ucb1x00_reg_write(ts->ucb, UCB_TS_CR, 0);
|
|
ucb1x00_disable(ts->ucb);
|
|
}
|
|
|
|
#ifdef CONFIG_PM
|
|
static int ucb1x00_ts_resume(struct ucb1x00_dev *dev)
|
|
{
|
|
struct ucb1x00_ts *ts = dev->priv;
|
|
|
|
if (ts->rtask != NULL) {
|
|
/*
|
|
* Restart the TS thread to ensure the
|
|
* TS interrupt mode is set up again
|
|
* after sleep.
|
|
*/
|
|
ts->restart = 1;
|
|
wake_up(&ts->irq_wait);
|
|
}
|
|
return 0;
|
|
}
|
|
#else
|
|
#define ucb1x00_ts_resume NULL
|
|
#endif
|
|
|
|
|
|
/*
|
|
* Initialisation.
|
|
*/
|
|
static int ucb1x00_ts_add(struct ucb1x00_dev *dev)
|
|
{
|
|
struct ucb1x00_ts *ts;
|
|
struct input_dev *idev;
|
|
int err;
|
|
|
|
ts = kzalloc(sizeof(struct ucb1x00_ts), GFP_KERNEL);
|
|
idev = input_allocate_device();
|
|
if (!ts || !idev) {
|
|
err = -ENOMEM;
|
|
goto fail;
|
|
}
|
|
|
|
ts->ucb = dev->ucb;
|
|
ts->idev = idev;
|
|
ts->adcsync = adcsync ? UCB_SYNC : UCB_NOSYNC;
|
|
|
|
idev->name = "Touchscreen panel";
|
|
idev->id.product = ts->ucb->id;
|
|
idev->open = ucb1x00_ts_open;
|
|
idev->close = ucb1x00_ts_close;
|
|
|
|
idev->evbit[0] = BIT_MASK(EV_ABS) | BIT_MASK(EV_KEY);
|
|
idev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
|
|
|
|
input_set_drvdata(idev, ts);
|
|
|
|
ucb1x00_adc_enable(ts->ucb);
|
|
ts->x_res = ucb1x00_ts_read_xres(ts);
|
|
ts->y_res = ucb1x00_ts_read_yres(ts);
|
|
ucb1x00_adc_disable(ts->ucb);
|
|
|
|
input_set_abs_params(idev, ABS_X, 0, ts->x_res, 0, 0);
|
|
input_set_abs_params(idev, ABS_Y, 0, ts->y_res, 0, 0);
|
|
input_set_abs_params(idev, ABS_PRESSURE, 0, 0, 0, 0);
|
|
|
|
err = input_register_device(idev);
|
|
if (err)
|
|
goto fail;
|
|
|
|
dev->priv = ts;
|
|
|
|
return 0;
|
|
|
|
fail:
|
|
input_free_device(idev);
|
|
kfree(ts);
|
|
return err;
|
|
}
|
|
|
|
static void ucb1x00_ts_remove(struct ucb1x00_dev *dev)
|
|
{
|
|
struct ucb1x00_ts *ts = dev->priv;
|
|
|
|
input_unregister_device(ts->idev);
|
|
kfree(ts);
|
|
}
|
|
|
|
static struct ucb1x00_driver ucb1x00_ts_driver = {
|
|
.add = ucb1x00_ts_add,
|
|
.remove = ucb1x00_ts_remove,
|
|
.resume = ucb1x00_ts_resume,
|
|
};
|
|
|
|
static int __init ucb1x00_ts_init(void)
|
|
{
|
|
return ucb1x00_register_driver(&ucb1x00_ts_driver);
|
|
}
|
|
|
|
static void __exit ucb1x00_ts_exit(void)
|
|
{
|
|
ucb1x00_unregister_driver(&ucb1x00_ts_driver);
|
|
}
|
|
|
|
module_param(adcsync, int, 0444);
|
|
module_init(ucb1x00_ts_init);
|
|
module_exit(ucb1x00_ts_exit);
|
|
|
|
MODULE_AUTHOR("Russell King <rmk@arm.linux.org.uk>");
|
|
MODULE_DESCRIPTION("UCB1x00 touchscreen driver");
|
|
MODULE_LICENSE("GPL");
|