386 строки
9.4 KiB
C
386 строки
9.4 KiB
C
/*
|
|
* 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 <mach/sharpsl.h>
|
|
#include <mach/hardware.h>
|
|
#include <mach/pxa2xx-gpio.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, IRQ_TYPE_NONE);
|
|
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, IRQ_TYPE_EDGE_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, IRQ_TYPE_EDGE_FALLING);
|
|
corgi_ts->power_mode = PWR_MODE_ACTIVE;
|
|
|
|
return 0;
|
|
}
|
|
#else
|
|
#define corgits_suspend NULL
|
|
#define corgits_resume NULL
|
|
#endif
|
|
|
|
static int __devinit 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, IRQ_TYPE_EDGE_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 __devexit 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 = __devexit_p(corgits_remove),
|
|
.suspend = corgits_suspend,
|
|
.resume = corgits_resume,
|
|
.driver = {
|
|
.name = "corgi-ts",
|
|
.owner = THIS_MODULE,
|
|
},
|
|
};
|
|
|
|
static int __init 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");
|
|
MODULE_ALIAS("platform:corgi-ts");
|