s3c2410_ts.c

2410 平台 linux2.6 触摸屏驱动 供学习参考用。

/****************************************************************
 * $ID: s3c2410_ts.c    三, 05  9月 2007 15:27:53 +0800  root $ *
 *                                                              *
 * Description:                                                 *
 *                                                              *
 * Maintainer:  (Meihui Fan)  <[e-mail]>            *
 *                                                              *
 * Copyright (C)  2007  HHTech                                  *
 *   www.hhcn.com, www.hhcn.org                                 *
 *   All rights reserved.                                       *
 *                                                              *
 * This file is free software;                                  *
 *   you are free to modify and/or redistribute it   	        *
 *   under the terms of the GNU General Public Licence (GPL).   *
 *                                                              *
 * Last modified: 三, 05  9月 2007 16:23:22 +0800       by root #
 ****************************************************************/


/****************** End Of File: s3c2410_ts.c ******************/
// vim:sts=4:ts=8: 

#include <linux/config.h> 
#include <linux/errno.h> 
#include <linux/kernel.h> 
#include <linux/module.h> 
#include <linux/slab.h> 
#include <linux/input.h> 
#include <linux/init.h> 
#include <linux/serio.h> 
#include <linux/delay.h> 
#include <linux/platform_device.h> 
#include <asm/io.h> 
#include <asm/irq.h> 
 
#include <asm/arch/regs-adc.h> 
#include <asm/arch/regs-gpio.h> 
#include <asm/arch/s3c2410_ts.h> 
#include <asm/hardware/clock.h>

/* 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
#define DEBUG_LVL KERN_ALERT

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);

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);
}

#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;

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<<ts.shift)) 
{
	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 
{
	mod_timer(&touch_timer, jiffies+1);
	writel(WAIT4INT(1), base_addr+S3C2410_ADCTSC);
}

return IRQ_HANDLED;
}

static struct clk *adc_clock;

/*
* The functions for inserting/removing us as a module.
*/

static int __init s3c2410ts_probe(struct device *dev)
{
struct s3c2410_ts_mach_info *info;

info = ( struct s3c2410_ts_mach_info *)dev->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();

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 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_updown", &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);
/*

Local variables:

compile-command: "make ARCH=arm CROSS_COMPILE=/usr/local/arm/3.3.2/bin/arm-linux- -k -C ../../.."

c-basic-offset: 8
End:
*/