www.pudn.com > s3c2410_ts.rar > s3c2410_ts.c
/*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* Copyright (c) 2004 Arnaud Patard
* iPAQ H1940 touchscreen support
*
* ChangeLog
*
* 2004-09-05: Herbert Pötzl
* - added clock (de-)allocation code
*
* 2005-03-06: Arnaud Patard
* - h1940_ -> s3c2410 (this driver is now also used on the n30
* machines :P)
* - Debug messages are now enabled with the config option
* TOUCHSCREEN_S3C2410_DEBUG
* - Changed the way the value are read
* - Input subsystem should now work
* - Use ioremap and readl/writel
*
* 2005-03-23: Arnaud Patard
* - Make use of some undocumented features of the touchscreen
* controller
*
*/
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
/* For ts.dev.id.version */
#define S3C2410TSVERSION 0x0101
#define WAIT4INT(x) (((x)<<8) | S3C2410_ADCTSC_YM_SEN | S3C2410_ADCTSC_YP_SEN | S3C2410_ADCTSC_XP_SEN | S3C2410_ADCTSC_XY_PST(3))
#define AUTOPST (S3C2410_ADCTSC_YM_SEN | S3C2410_ADCTSC_YP_SEN | S3C2410_ADCTSC_XP_SEN | S3C2410_ADCTSC_AUTO_PST | S3C2410_ADCTSC_XY_PST(0))
#define DEBUG_LVL KERN_DEBUG
MODULE_AUTHOR("Arnaud Patard ");
MODULE_DESCRIPTION("s3c2410 touchscreen driver");
MODULE_LICENSE("GPL");
/*
* Definitions & global arrays.
*/
static char *s3c2410ts_name = "s3c2410 TouchScreen";
/*
* Per-touchscreen data.
*/
struct s3c2410ts {
struct input_dev dev;
long xp;
long yp;
int count;
int shift;
char phys[32];
};
static struct s3c2410ts ts;
static void __iomem *base_addr;
static inline void s3c2410_ts_connect(void)
{
s3c2410_gpio_cfgpin(S3C2410_GPG12, S3C2410_GPG12_XMON);
s3c2410_gpio_cfgpin(S3C2410_GPG13, S3C2410_GPG13_nXPON);
s3c2410_gpio_cfgpin(S3C2410_GPG14, S3C2410_GPG14_YMON);
s3c2410_gpio_cfgpin(S3C2410_GPG15, S3C2410_GPG15_nYPON);
}
static void touch_timer_fire(unsigned long data)
{
unsigned long data0;
unsigned long data1;
int updown;
data0 = readl(base_addr+S3C2410_ADCDAT0);
data1 = readl(base_addr+S3C2410_ADCDAT1);
updown = (!(data0 & S3C2410_ADCDAT0_UPDOWN)) && (!(data1 & S3C2410_ADCDAT1_UPDOWN));
if (updown) {
if (ts.count != 0) {
ts.xp >>= ts.shift;
ts.yp >>= ts.shift;
//#ifdef CONFIG_TOUCHSCREEN_S3C2410_DEBUG
{
struct timeval tv;
do_gettimeofday(&tv);
// printk(DEBUG_LVL "T: %06d, X: %03ld, Y: %03ld\n", (int)tv.tv_usec, ts.xp, ts.yp);
printk(KERN_INFO "T: %06d, X: %03ld, Y: %03ld\n", (int)tv.tv_usec, ts.xp, ts.yp);
}
//#endif
input_report_abs(&ts.dev, ABS_X, ts.xp);
input_report_abs(&ts.dev, ABS_Y, ts.yp);
input_report_key(&ts.dev, BTN_TOUCH, 1);
input_report_abs(&ts.dev, ABS_PRESSURE, 1);
input_sync(&ts.dev);
}
ts.xp = 0;
ts.yp = 0;
ts.count = 0;
writel(S3C2410_ADCTSC_PULL_UP_DISABLE | AUTOPST, base_addr+S3C2410_ADCTSC);
writel(readl(base_addr+S3C2410_ADCCON) | S3C2410_ADCCON_ENABLE_START, base_addr+S3C2410_ADCCON);
} else {
ts.count = 0;
input_report_key(&ts.dev, BTN_TOUCH, 0);
input_report_abs(&ts.dev, ABS_PRESSURE, 0);
input_sync(&ts.dev);
writel(WAIT4INT(0), base_addr+S3C2410_ADCTSC);
}
}
static struct timer_list touch_timer =
TIMER_INITIALIZER(touch_timer_fire, 0, 0);
static irqreturn_t stylus_updown(int irq, void *dev_id, struct pt_regs *regs)
{
unsigned long data0;
unsigned long data1;
int updown;
/********************************debug************************************/
printk(KERN_INFO "You touch the screen\n");
/*************************************************************************/
data0 = readl(base_addr+S3C2410_ADCDAT0);
data1 = readl(base_addr+S3C2410_ADCDAT1);
updown = (!(data0 & S3C2410_ADCDAT0_UPDOWN)) && (!(data1 & S3C2410_ADCDAT1_UPDOWN));
/* TODO we should never get an interrupt with updown set while
* the timer is running, but maybe we ought to verify that the
* timer isn't running anyways. */
if (updown)
touch_timer_fire(0);
return IRQ_HANDLED;
}
static irqreturn_t stylus_action(int irq, void *dev_id, struct pt_regs *regs)
{
unsigned long data0;
unsigned long data1;
data0 = readl(base_addr+S3C2410_ADCDAT0);
data1 = readl(base_addr+S3C2410_ADCDAT1);
ts.xp += data0 & S3C2410_ADCDAT0_XPDATA_MASK;
ts.yp += data1 & S3C2410_ADCDAT1_YPDATA_MASK;
ts.count++;
if (ts.count < (1<platform_data;
if (!info)
{
printk(KERN_ERR "Hm... too bad : no platform data for ts\n");
return -EINVAL;
}
#ifdef CONFIG_TOUCHSCREEN_S3C2410_DEBUG
printk(DEBUG_LVL "Entering s3c2410ts_init\n");
#endif
adc_clock = clk_get(NULL, "adc");
if (!adc_clock) {
printk(KERN_ERR "failed to get adc clock source\n");
return -ENOENT;
}
clk_use(adc_clock);
clk_enable(adc_clock);
#ifdef CONFIG_TOUCHSCREEN_S3C2410_DEBUG
printk(DEBUG_LVL "got and enabled clock\n");
#endif
base_addr=ioremap(S3C2410_PA_ADC,0x20);
if (base_addr == NULL) {
printk(KERN_ERR "Failed to remap register block\n");
return -ENOMEM;
}
/* Configure GPIOs */
s3c2410_ts_connect();
/* Set the prscvl*/
if ((info->presc&0xff) > 0)
writel(S3C2410_ADCCON_PRSCEN | S3C2410_ADCCON_PRSCVL(info->presc&0xFF),\
base_addr+S3C2410_ADCCON);
else
writel(0,base_addr+S3C2410_ADCCON);
/* Initialise the adcdly registers */
if ((info->delay&0xffff) > 0)
writel(info->delay & 0xffff, base_addr+S3C2410_ADCDLY);
writel(WAIT4INT(0), base_addr+S3C2410_ADCTSC);
/* Initialise input stuff */
memset(&ts, 0, sizeof(struct s3c2410ts));
init_input_dev(&ts.dev);
ts.dev.evbit[0] = ts.dev.evbit[0] = BIT(EV_SYN) | BIT(EV_KEY) | BIT(EV_ABS);
ts.dev.keybit[LONG(BTN_TOUCH)] = BIT(BTN_TOUCH);
input_set_abs_params(&ts.dev, ABS_X, 0, 0x3FF, 0, 0);
input_set_abs_params(&ts.dev, ABS_Y, 0, 0x3FF, 0, 0);
input_set_abs_params(&ts.dev, ABS_PRESSURE, 0, 1, 0, 0);
sprintf(ts.phys, "ts0");
ts.dev.private = &ts;
ts.dev.name = s3c2410ts_name;
ts.dev.phys = ts.phys;
ts.dev.id.bustype = BUS_RS232;
ts.dev.id.vendor = 0xDEAD;
ts.dev.id.product = 0xBEEF;
ts.dev.id.version = S3C2410TSVERSION;
ts.shift = info->oversampling_shift;
/* Get irqs */
if (request_irq(IRQ_ADC, stylus_action, SA_SAMPLE_RANDOM,
"s3c2410_action", &ts.dev)) {
printk(KERN_ERR "s3c2410_ts.c: Could not allocate ts IRQ_ADC !\n");
iounmap(base_addr);
return -EIO;
}
if (request_irq(IRQ_TC, stylus_updown, SA_SAMPLE_RANDOM,
"s3c2410_action", &ts.dev)) {
printk(KERN_ERR "s3c2410_ts.c: Could not allocate ts IRQ_TC !\n");
iounmap(base_addr);
return -EIO;
}
printk(KERN_INFO "%s successfully loaded\n", s3c2410ts_name);
/* All went ok, so register to the input system */
input_register_device(&ts.dev);
return 0;
}
static int s3c2410ts_remove(struct device *dev)
{
disable_irq(IRQ_ADC);
disable_irq(IRQ_TC);
free_irq(IRQ_TC,&ts.dev);
free_irq(IRQ_ADC,&ts.dev);
if (adc_clock) {
clk_disable(adc_clock);
clk_unuse(adc_clock);
clk_put(adc_clock);
adc_clock = NULL;
}
input_unregister_device(&ts.dev);
iounmap(base_addr);
return 0;
}
static struct device_driver s3c2410ts_driver = {
.name = "s3c2410-ts",
.bus = &platform_bus_type,
.probe = s3c2410ts_probe,
.remove = s3c2410ts_remove,
};
int __init s3c2410ts_init(void)
{
return driver_register(&s3c2410ts_driver);
}
void __exit s3c2410ts_exit(void)
{
driver_unregister(&s3c2410ts_driver);
}
module_init(s3c2410ts_init);
module_exit(s3c2410ts_exit);