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linux/drivers/input/touchscreen/corgi_ts.c
Richard Purdie ca4d6cfcee [ARM] 4737/1: Refactor corgi_lcd to improve readability + bugfix 
This patch refactors the code in corgi_lcd.c moving it to the board
specific corgi and spitz files where appropriate instead of the
existing ifdef mess which hinders readability.

Fix spitz_get_hsync_len() to call get_hsync_invperiod so pxafb can be
compiled as a module.

The confusing variables which represent the inverse horizintal sync
period are renamed to "invperiod" consistently.

An incorrect comment in corgi_ts.c is also corrected.

Signed-off-by: Richard Purdie <rpurdie@rpsys.net>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2008-01-28 13:13:25 +00:00

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9.3 KiB
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/*
* Touchscreen driver for Sharp SL-C7xx and SL-Cxx00 models
*
* Copyright (c) 2004-2005 Richard Purdie
*
* 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/delay.h>
#include <linux/platform_device.h>
#include <linux/init.h>
#include <linux/input.h>
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/irq.h>
#include <asm/arch/sharpsl.h>
#include <asm/arch/hardware.h>
#include <asm/arch/pxa-regs.h>
#define PWR_MODE_ACTIVE 0
#define PWR_MODE_SUSPEND 1
#define X_AXIS_MAX 3830
#define X_AXIS_MIN 150
#define Y_AXIS_MAX 3830
#define Y_AXIS_MIN 190
#define PRESSURE_MIN 0
#define PRESSURE_MAX 15000
struct ts_event {
short pressure;
short x;
short y;
};
struct corgi_ts {
struct input_dev *input;
struct timer_list timer;
struct ts_event tc;
int pendown;
int power_mode;
int irq_gpio;
struct corgits_machinfo *machinfo;
};
#ifdef CONFIG_PXA25x
#define CCNT(a) asm volatile ("mrc p14, 0, %0, C1, C0, 0" : "=r"(a))
#define PMNC_GET(x) asm volatile ("mrc p14, 0, %0, C0, C0, 0" : "=r"(x))
#define PMNC_SET(x) asm volatile ("mcr p14, 0, %0, C0, C0, 0" : : "r"(x))
#endif
#ifdef CONFIG_PXA27x
#define CCNT(a) asm volatile ("mrc p14, 0, %0, C1, C1, 0" : "=r"(a))
#define PMNC_GET(x) asm volatile ("mrc p14, 0, %0, C0, C1, 0" : "=r"(x))
#define PMNC_SET(x) asm volatile ("mcr p14, 0, %0, C0, C1, 0" : : "r"(x))
#endif
/* ADS7846 Touch Screen Controller bit definitions */
#define ADSCTRL_PD0 (1u << 0) /* PD0 */
#define ADSCTRL_PD1 (1u << 1) /* PD1 */
#define ADSCTRL_DFR (1u << 2) /* SER/DFR */
#define ADSCTRL_MOD (1u << 3) /* Mode */
#define ADSCTRL_ADR_SH 4 /* Address setting */
#define ADSCTRL_STS (1u << 7) /* Start Bit */
/* External Functions */
extern unsigned int get_clk_frequency_khz(int info);
static unsigned long calc_waittime(struct corgi_ts *corgi_ts)
{
unsigned long hsync_invperiod = corgi_ts->machinfo->get_hsync_invperiod();
if (hsync_invperiod)
return get_clk_frequency_khz(0)*1000/hsync_invperiod;
else
return 0;
}
static int sync_receive_data_send_cmd(struct corgi_ts *corgi_ts, int doRecive, int doSend,
unsigned int address, unsigned long wait_time)
{
unsigned long timer1 = 0, timer2, pmnc = 0;
int pos = 0;
if (wait_time && doSend) {
PMNC_GET(pmnc);
if (!(pmnc & 0x01))
PMNC_SET(0x01);
/* polling HSync */
corgi_ts->machinfo->wait_hsync();
/* get CCNT */
CCNT(timer1);
}
if (doRecive)
pos = corgi_ssp_ads7846_get();
if (doSend) {
int cmd = ADSCTRL_PD0 | ADSCTRL_PD1 | (address << ADSCTRL_ADR_SH) | ADSCTRL_STS;
/* dummy command */
corgi_ssp_ads7846_put(cmd);
corgi_ssp_ads7846_get();
if (wait_time) {
/* Wait after HSync */
CCNT(timer2);
if (timer2-timer1 > wait_time) {
/* too slow - timeout, try again */
corgi_ts->machinfo->wait_hsync();
/* get CCNT */
CCNT(timer1);
/* Wait after HSync */
CCNT(timer2);
}
while (timer2 - timer1 < wait_time)
CCNT(timer2);
}
corgi_ssp_ads7846_put(cmd);
if (wait_time && !(pmnc & 0x01))
PMNC_SET(pmnc);
}
return pos;
}
static int read_xydata(struct corgi_ts *corgi_ts)
{
unsigned int x, y, z1, z2;
unsigned long flags, wait_time;
/* critical section */
local_irq_save(flags);
corgi_ssp_ads7846_lock();
wait_time = calc_waittime(corgi_ts);
/* Y-axis */
sync_receive_data_send_cmd(corgi_ts, 0, 1, 1u, wait_time);
/* Y-axis */
sync_receive_data_send_cmd(corgi_ts, 1, 1, 1u, wait_time);
/* X-axis */
y = sync_receive_data_send_cmd(corgi_ts, 1, 1, 5u, wait_time);
/* Z1 */
x = sync_receive_data_send_cmd(corgi_ts, 1, 1, 3u, wait_time);
/* Z2 */
z1 = sync_receive_data_send_cmd(corgi_ts, 1, 1, 4u, wait_time);
z2 = sync_receive_data_send_cmd(corgi_ts, 1, 0, 4u, wait_time);
/* Power-Down Enable */
corgi_ssp_ads7846_put((1u << ADSCTRL_ADR_SH) | ADSCTRL_STS);
corgi_ssp_ads7846_get();
corgi_ssp_ads7846_unlock();
local_irq_restore(flags);
if (x== 0 || y == 0 || z1 == 0 || (x * (z2 - z1) / z1) >= 15000) {
corgi_ts->tc.pressure = 0;
return 0;
}
corgi_ts->tc.x = x;
corgi_ts->tc.y = y;
corgi_ts->tc.pressure = (x * (z2 - z1)) / z1;
return 1;
}
static void new_data(struct corgi_ts *corgi_ts)
{
struct input_dev *dev = corgi_ts->input;
if (corgi_ts->power_mode != PWR_MODE_ACTIVE)
return;
if (!corgi_ts->tc.pressure && corgi_ts->pendown == 0)
return;
input_report_abs(dev, ABS_X, corgi_ts->tc.x);
input_report_abs(dev, ABS_Y, corgi_ts->tc.y);
input_report_abs(dev, ABS_PRESSURE, corgi_ts->tc.pressure);
input_report_key(dev, BTN_TOUCH, corgi_ts->pendown);
input_sync(dev);
}
static void ts_interrupt_main(struct corgi_ts *corgi_ts, int isTimer)
{
if ((GPLR(IRQ_TO_GPIO(corgi_ts->irq_gpio)) & GPIO_bit(IRQ_TO_GPIO(corgi_ts->irq_gpio))) == 0) {
/* Disable Interrupt */
set_irq_type(corgi_ts->irq_gpio, IRQT_NOEDGE);
if (read_xydata(corgi_ts)) {
corgi_ts->pendown = 1;
new_data(corgi_ts);
}
mod_timer(&corgi_ts->timer, jiffies + HZ / 100);
} else {
if (corgi_ts->pendown == 1 || corgi_ts->pendown == 2) {
mod_timer(&corgi_ts->timer, jiffies + HZ / 100);
corgi_ts->pendown++;
return;
}
if (corgi_ts->pendown) {
corgi_ts->tc.pressure = 0;
new_data(corgi_ts);
}
/* Enable Falling Edge */
set_irq_type(corgi_ts->irq_gpio, IRQT_FALLING);
corgi_ts->pendown = 0;
}
}
static void corgi_ts_timer(unsigned long data)
{
struct corgi_ts *corgits_data = (struct corgi_ts *) data;
ts_interrupt_main(corgits_data, 1);
}
static irqreturn_t ts_interrupt(int irq, void *dev_id)
{
struct corgi_ts *corgits_data = dev_id;
ts_interrupt_main(corgits_data, 0);
return IRQ_HANDLED;
}
#ifdef CONFIG_PM
static int corgits_suspend(struct platform_device *dev, pm_message_t state)
{
struct corgi_ts *corgi_ts = platform_get_drvdata(dev);
if (corgi_ts->pendown) {
del_timer_sync(&corgi_ts->timer);
corgi_ts->tc.pressure = 0;
new_data(corgi_ts);
corgi_ts->pendown = 0;
}
corgi_ts->power_mode = PWR_MODE_SUSPEND;
corgi_ssp_ads7846_putget((1u << ADSCTRL_ADR_SH) | ADSCTRL_STS);
return 0;
}
static int corgits_resume(struct platform_device *dev)
{
struct corgi_ts *corgi_ts = platform_get_drvdata(dev);
corgi_ssp_ads7846_putget((4u << ADSCTRL_ADR_SH) | ADSCTRL_STS);
/* Enable Falling Edge */
set_irq_type(corgi_ts->irq_gpio, IRQT_FALLING);
corgi_ts->power_mode = PWR_MODE_ACTIVE;
return 0;
}
#else
#define corgits_suspend NULL
#define corgits_resume NULL
#endif
static int __init corgits_probe(struct platform_device *pdev)
{
struct corgi_ts *corgi_ts;
struct input_dev *input_dev;
int err = -ENOMEM;
corgi_ts = kzalloc(sizeof(struct corgi_ts), GFP_KERNEL);
input_dev = input_allocate_device();
if (!corgi_ts || !input_dev)
goto fail1;
platform_set_drvdata(pdev, corgi_ts);
corgi_ts->machinfo = pdev->dev.platform_data;
corgi_ts->irq_gpio = platform_get_irq(pdev, 0);
if (corgi_ts->irq_gpio < 0) {
err = -ENODEV;
goto fail1;
}
corgi_ts->input = input_dev;
init_timer(&corgi_ts->timer);
corgi_ts->timer.data = (unsigned long) corgi_ts;
corgi_ts->timer.function = corgi_ts_timer;
input_dev->name = "Corgi Touchscreen";
input_dev->phys = "corgits/input0";
input_dev->id.bustype = BUS_HOST;
input_dev->id.vendor = 0x0001;
input_dev->id.product = 0x0002;
input_dev->id.version = 0x0100;
input_dev->dev.parent = &pdev->dev;
input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
input_set_abs_params(input_dev, ABS_X, X_AXIS_MIN, X_AXIS_MAX, 0, 0);
input_set_abs_params(input_dev, ABS_Y, Y_AXIS_MIN, Y_AXIS_MAX, 0, 0);
input_set_abs_params(input_dev, ABS_PRESSURE, PRESSURE_MIN, PRESSURE_MAX, 0, 0);
pxa_gpio_mode(IRQ_TO_GPIO(corgi_ts->irq_gpio) | GPIO_IN);
/* Initiaize ADS7846 Difference Reference mode */
corgi_ssp_ads7846_putget((1u << ADSCTRL_ADR_SH) | ADSCTRL_STS);
mdelay(5);
corgi_ssp_ads7846_putget((3u << ADSCTRL_ADR_SH) | ADSCTRL_STS);
mdelay(5);
corgi_ssp_ads7846_putget((4u << ADSCTRL_ADR_SH) | ADSCTRL_STS);
mdelay(5);
corgi_ssp_ads7846_putget((5u << ADSCTRL_ADR_SH) | ADSCTRL_STS);
mdelay(5);
if (request_irq(corgi_ts->irq_gpio, ts_interrupt, IRQF_DISABLED, "ts", corgi_ts)) {
err = -EBUSY;
goto fail1;
}
err = input_register_device(corgi_ts->input);
if (err)
goto fail2;
corgi_ts->power_mode = PWR_MODE_ACTIVE;
/* Enable Falling Edge */
set_irq_type(corgi_ts->irq_gpio, IRQT_FALLING);
return 0;
fail2: free_irq(corgi_ts->irq_gpio, corgi_ts);
fail1: input_free_device(input_dev);
kfree(corgi_ts);
return err;
}
static int corgits_remove(struct platform_device *pdev)
{
struct corgi_ts *corgi_ts = platform_get_drvdata(pdev);
free_irq(corgi_ts->irq_gpio, corgi_ts);
del_timer_sync(&corgi_ts->timer);
corgi_ts->machinfo->put_hsync();
input_unregister_device(corgi_ts->input);
kfree(corgi_ts);
return 0;
}
static struct platform_driver corgits_driver = {
.probe = corgits_probe,
.remove = corgits_remove,
.suspend = corgits_suspend,
.resume = corgits_resume,
.driver = {
.name = "corgi-ts",
},
};
static int __devinit corgits_init(void)
{
return platform_driver_register(&corgits_driver);
}
static void __exit corgits_exit(void)
{
platform_driver_unregister(&corgits_driver);
}
module_init(corgits_init);
module_exit(corgits_exit);
MODULE_AUTHOR("Richard Purdie <rpurdie@rpsys.net>");
MODULE_DESCRIPTION("Corgi TouchScreen Driver");
MODULE_LICENSE("GPL");
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