2.6.30.4上触摸功能的实现(FS2410)

这篇文章的前提是LCD驱动已经实现，我参照的是天嵌的2440开发手册，这此表示感谢，
首先在driver/input/touchscreen/下新建一个fs2410_ts.c的文件，然后添加如下内容：
/*************************************

NAME:fs2410_ts.c
COPYRIGHT:

*************************************/

#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 <linux/clk.h>
#include <asm/io.h>
#include <asm/irq.h>

#include <plat/regs-adc.h>
#include <mach/regs-gpio.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))

static char *fs2410ts_name = "FS2410 TouchScreen";

static struct input_dev *dev;
static long xp;
static long yp;
static int count;

//extern struct semaphore ADC_LOCK;
DECLARE_MUTEX(ADC_LOCK);
static int OwnADC = 0;

static void __iomem *base_addr;

static inline void fs2410_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 = ioread32(base_addr+S3C2410_ADCDAT0);
   data1 = ioread32(base_addr+S3C2410_ADCDAT1);

  updown = (!(data0 & S3C2410_ADCDAT0_UPDOWN)) && (!(data1 & S3C2410_ADCDAT0_UPDOWN));

  if (updown) {
   if (count != 0)
   {
   long tmp;
                                                                                                
   tmp = xp;
   xp = yp;
   yp = tmp;
                                                                                                
                        xp >>= 2;
                        yp >>= 2;

    input_report_abs(dev, ABS_X, xp);
    input_report_abs(dev, ABS_Y, yp);

    input_report_key(dev, BTN_TOUCH, 1);
    input_report_abs(dev, ABS_PRESSURE, 1);
    input_sync(dev);
   }

   xp = 0;
   yp = 0;
   count = 0;

   iowrite32(S3C2410_ADCTSC_PULL_UP_DISABLE | AUTOPST, base_addr+S3C2410_ADCTSC);
   iowrite32(ioread32(base_addr+S3C2410_ADCCON) | S3C2410_ADCCON_ENABLE_START, base_addr+S3C2410_ADCCON);
  }
  else
  {
   count = 0;

   input_report_key(dev, BTN_TOUCH, 0);
   input_report_abs(dev, ABS_PRESSURE, 0);
   input_sync(dev);

   iowrite32(WAIT4INT(0), base_addr+S3C2410_ADCTSC);
  if (OwnADC)
  {
   OwnADC = 0;
   up(&ADC_LOCK);
  }
  }
}

static struct timer_list touch_timer =
  TIMER_INITIALIZER(touch_timer_fire, 0, 0);

static irqreturn_t stylus_updown(int irq, void *dev_id)
{
 unsigned long data0;
 unsigned long data1;
 int updown;

 if (down_trylock(&ADC_LOCK) == 0)
 {
  OwnADC = 1;
  data0 = ioread32(base_addr+S3C2410_ADCDAT0);
  data1 = ioread32(base_addr+S3C2410_ADCDAT1);

  updown = (!(data0 & S3C2410_ADCDAT0_UPDOWN)) && (!(data1 & S3C2410_ADCDAT0_UPDOWN));

  if (updown)
  {
   touch_timer_fire(0);
  }
  else
  {
   OwnADC = 0;
   up(&ADC_LOCK);
  }
 }

 return IRQ_HANDLED;
}

static irqreturn_t stylus_action(int irq, void *dev_id)
{
 unsigned long data0;
 unsigned long data1;

 if (OwnADC)
 {
  data0 = ioread32(base_addr+S3C2410_ADCDAT0);
  data1 = ioread32(base_addr+S3C2410_ADCDAT1);

  xp += data0 & S3C2410_ADCDAT0_XPDATA_MASK;
  yp += data1 & S3C2410_ADCDAT1_YPDATA_MASK;
  count++;

  if (count < (1<<2))
  {
   iowrite32(S3C2410_ADCTSC_PULL_UP_DISABLE | AUTOPST, base_addr+S3C2410_ADCTSC);
   iowrite32(ioread32(base_addr+S3C2410_ADCCON) | S3C2410_ADCCON_ENABLE_START, base_addr+S3C2410_ADCCON);
  }
  else
  {
   mod_timer(&touch_timer, jiffies+1);
   iowrite32(WAIT4INT(1), base_addr+S3C2410_ADCTSC);
  }
 }

 return IRQ_HANDLED;
}

static struct clk *adc_clock;

static int __init fs2410ts_init(void)
{
 struct input_dev *input_dev;

 adc_clock = clk_get(NULL, "adc");
 if (!adc_clock)
 {
  printk(KERN_ERR "failed to get adc clock source/n");
  return -ENOENT;
 }
 clk_enable(adc_clock);

 base_addr=ioremap(S3C2410_PA_ADC,0x20);
 if (base_addr == NULL)
 {
  printk(KERN_ERR "Failed to remap register block/n");
  return -ENOMEM;
 }

 /* Configure GPIOs */
 fs2410_ts_connect();

 iowrite32(S3C2410_ADCCON_PRSCEN | S3C2410_ADCCON_PRSCVL(0xFF),base_addr+S3C2410_ADCCON);
 iowrite32(0xffff,  base_addr+S3C2410_ADCDLY);
 iowrite32(WAIT4INT(0), base_addr+S3C2410_ADCTSC);

 /* Initialise input stuff */
 input_dev = input_allocate_device();

 if (!input_dev)
 {
  printk(KERN_ERR "Unable to allocate the input device !!/n");
  return -ENOMEM;
 }

 dev = input_dev;
 dev->evbit[0] = BIT(EV_SYN) | BIT(EV_KEY) | BIT(EV_ABS);
 dev->keybit[BITS_TO_LONGS(BTN_TOUCH)] = BIT(BTN_TOUCH);
 input_set_abs_params(dev, ABS_X, 0, 0x3FF, 0, 0);
 input_set_abs_params(dev, ABS_Y, 0, 0x3FF, 0, 0);
 input_set_abs_params(dev, ABS_PRESSURE, 0, 1, 0, 0);

 dev->name = fs2410ts_name;
 dev->id.bustype = BUS_RS232;
 dev->id.vendor = 0xDEAD;
 dev->id.product = 0xBEEF;
 dev->id.version = S3C2410TSVERSION;

 if (request_irq(IRQ_ADC, stylus_action, IRQF_SHARED|IRQF_SAMPLE_RANDOM, fs2410ts_name, dev))
 {
  printk(KERN_ERR "fs2410_ts.c: Could not allocate ts IRQ_ADC !/n");
  iounmap(base_addr);
  return -EIO;
 }
 if (request_irq(IRQ_TC, stylus_updown, IRQF_SAMPLE_RANDOM, fs2410ts_name, dev))
 {
  printk(KERN_ERR "fs2410_ts.c: Could not allocate ts IRQ_ADC !/n");
  iounmap(base_addr);
  return -EIO;
 }

 printk(KERN_INFO "%s successfully loaded/n", fs2410ts_name);

 input_register_device(dev);

 return 0;
}

static void __exit fs2410ts_exit(void)
{
 disable_irq(IRQ_ADC);
 disable_irq(IRQ_TC);
 free_irq(IRQ_TC,dev);
 free_irq(IRQ_ADC,dev);

 if (adc_clock)
 {
  clk_disable(adc_clock);
  clk_put(adc_clock);
  adc_clock = NULL;
 }

 input_unregister_device(dev);
 iounmap(base_addr);
}

module_init(fs2410ts_init);
module_exit(fs2410ts_exit);

2.修改同目录下的Kconfig文件：
添加如下内容：

    469 config TOUCHSCREEN_FS2410
    470         tristate "DAYS999 FS2410 TouchScreen input driver"
    471         depends on ARCH_S3C2410 && INPUT && INPUT_TOUCHSCREEN
    472         help
    473           Say Y here if you have the FS2410 TouchScreen.
    474           and depends on FS2410_ADC
    475
    476           If unsure, say N.
    477
    478           To compile this driver as a module, choose M here: the
    479           module will be called fs2410_ts.

3.修改同目录下的Makefile文件:在最后加入：
obj-$(CONFIG_TOUCHSCREEN_FS2410) += fs2410_ts.o

4.配置内核：make menuconfig

Device Drivers-->Input device support-->[*]Touchscreens---><*> DAYS999 FS2410 TouchScreen input driver

5,编译烧入板子
如果出现如下提示：

...............
FS2410 TouchScreen successfully loaded
input: FS2410 TouchScreen as /class/input/input0
................
则证明触摸移植成功(其实要想利用触摸功能，还要配置文件系统，这样的文章网上很多的)