mirror of
https://github.com/torvalds/linux.git
synced 2024-12-05 18:41:23 +00:00
cd95842ca0
Patch from Markus Gutschke In order to prevent gcc from making incorrect optimizations, all asm() statements that define system calls should report memory as clobbered. Recent versions of the headers for i386 have been changed accordingly, but the ARM headers are still defective. This patch fixes the bug tracked at http://bugzilla.kernel.org/show_bug.cgi?id=6205 Signed-off-by: Markus Gutschke <markus@google.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
379 lines
9.4 KiB
C
379 lines
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 <asm/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_len = corgi_ts->machinfo->get_hsync_len();
|
|
|
|
if (hsync_len)
|
|
return get_clk_frequency_khz(0)*1000/hsync_len;
|
|
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 OSCR */
|
|
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 pt_regs *regs)
|
|
{
|
|
if (corgi_ts->power_mode != PWR_MODE_ACTIVE)
|
|
return;
|
|
|
|
if (!corgi_ts->tc.pressure && corgi_ts->pendown == 0)
|
|
return;
|
|
|
|
input_regs(corgi_ts->input, regs);
|
|
input_report_abs(corgi_ts->input, ABS_X, corgi_ts->tc.x);
|
|
input_report_abs(corgi_ts->input, ABS_Y, corgi_ts->tc.y);
|
|
input_report_abs(corgi_ts->input, ABS_PRESSURE, corgi_ts->tc.pressure);
|
|
input_report_key(corgi_ts->input, BTN_TOUCH, (corgi_ts->pendown != 0));
|
|
input_sync(corgi_ts->input);
|
|
}
|
|
|
|
static void ts_interrupt_main(struct corgi_ts *corgi_ts, int isTimer, struct pt_regs *regs)
|
|
{
|
|
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, regs);
|
|
}
|
|
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, regs);
|
|
}
|
|
|
|
/* 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, NULL);
|
|
}
|
|
|
|
static irqreturn_t ts_interrupt(int irq, void *dev_id, struct pt_regs *regs)
|
|
{
|
|
struct corgi_ts *corgits_data = dev_id;
|
|
ts_interrupt_main(corgits_data, 0, regs);
|
|
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, NULL);
|
|
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 fail;
|
|
|
|
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 fail;
|
|
}
|
|
|
|
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->cdev.dev = &pdev->dev;
|
|
input_dev->private = corgi_ts;
|
|
|
|
input_dev->evbit[0] = BIT(EV_KEY) | BIT(EV_ABS);
|
|
input_dev->keybit[LONG(BTN_TOUCH)] = BIT(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, SA_INTERRUPT, "ts", corgi_ts)) {
|
|
err = -EBUSY;
|
|
goto fail;
|
|
}
|
|
|
|
input_register_device(corgi_ts->input);
|
|
|
|
corgi_ts->power_mode = PWR_MODE_ACTIVE;
|
|
|
|
/* Enable Falling Edge */
|
|
set_irq_type(corgi_ts->irq_gpio, IRQT_FALLING);
|
|
|
|
return 0;
|
|
|
|
fail: 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, NULL);
|
|
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");
|