linux-2.6.24.4 移植:触摸屏移植

 

转载来源:http://blog.163.com/yuan_xihua/blog/static/30740544200811832630293/

针对本人运行环境,稍作修改.

本人移植环境：
主机：Red.Hat.9.0（完全安装）
交叉编译器：arm-linux-gcc-3.4.1
开发板平台：S3C2440（GEC-2440开发板）

目标板linux内核版本：26.24.4   / 目标板bootloader ：u-boot 1.2

添加touchscreen驱动到基于linux-2.6.24的GEC2440开发板

1， 修改drivers/input/touchscreen/Makefile文件
# vi drivers/input/touchscreen/Makefile

添加：
obj-$(CONFIG_TOUCHSCREEN_S3C2410) += s3c2410_ts.o

2， 修改drivers/input/touchscreen/Kconfig文件

# vi drivers/input/touchscreen/Kconfig
添加：
config TOUCHSCREEN_S3C2410
   tristate "Samsung S3C2410 touchscreen input driver"
   depends on ARCH_SMDK2410 && INPUT && INPUT_TOUCHSCREEN
   select SERIO
   help
    Say Y here if you have the s3c2410 touchscreen.
    If unsure, say N.
    To compile this driver as a module, choose M here: the
    module will be called s3c2410_ts.

config TOUCHSCREEN_S3C2410_DEBUG
   boolean "Samsung S3C2410 touchscreen debug messages"
   depends on TOUCHSCREEN_S3C2410
   help
    Select this if you want debug messages
  
3，编译配置内核
      # make menuconfig
进入配置菜单添加驱动到内核：
Device Drivers --->
Input device support --->
[*]   Touchscreens --->
<*>   Samsung S3C2410 touchscreen input driver
[*]     Samsung S3C2410 touchscreen debug messages

4，修改arch/arm/mach-s3c2410/mach-smdk2410.c文件
      # vi arch/arm/mach-s3c2410/mach-smdk2410.c
添加：
   static struct s3c2410_ts_mach_info gec2440_ts_cfg __initdata = {
   .delay = 10000,
   .presc = 49,
   .oversampling_shift = 2,
   };

在static struct platform_device *smdk2410_devices[] __initdata = {结构中添加：
   &s3c_device_ts,
  
在static void __init smdk2410_map_io(void)函数中添加：
   s3c24xx_init_touchscreen(&gec2440_ts_cfg);

5，修改include/asm-arm/plat-s3c24xx/devs.h文件
# vi include/asm-arm/plat-s3c24xx/devs.h

添加：
struct s3c2410_ts_mach_info {
        int             delay;
        int             presc;
        int             oversampling_shift;
};

void __init s3c24xx_init_touchscreen(struct s3c2410_ts_mach_info *hard_s3c2410_ts_info);
extern struct platform_device s3c_device_ts;

6，修改arch/arm/plat-s3c24xx/devs.c文件
# vi arch/arm/plat-s3c24xx/devs.c

添加：

// Touchscreen

static struct s3c2410_ts_mach_info s3c2410_ts_info;

void __init s3c24xx_init_touchscreen(struct s3c2410_ts_mach_info *hard_s3c2410_ts_info)
{
   memcpy(&s3c2410_ts_info,hard_s3c2410_ts_info,sizeof(struct s3c2410_ts_mach_info));
}

EXPORT_SYMBOL(s3c24xx_init_touchscreen);

struct platform_device s3c_device_ts = {
   .name = "s3c2410-ts",
   .id = -1,
   .num_resources   = ARRAY_SIZE(s3c_adc_resource),
   .resource   = s3c_adc_resource,
   .dev = {
    .platform_data = &s3c2410_ts_info,
   }
};
EXPORT_SYMBOL(s3c_device_ts);

7，添加drivers/input/touchscreen/s3c2410_ts.c文件
# vi drivers/input/touchscreen/s3c2410_ts.c
添加的源码见附件。

8，编译内核生成驱动
# make

9，在内核启动可以看到input: s3c2410 Touchscreen as /class/input/input0
注册信息为：
# cat /proc/bus/input/devices
I: Bus=0019 Vendor=0001 Product=0002 Version=0100
N: Name="s3c2410 Touchscreen"
P: Phys=s3c2410ts/input0
S: Sysfs=/class/input/input0
U: Uniq=
H: Handlers=mouse0 event0
B: EV=b
B: KEY=400 0 0 0 0 0 0 0 0 0 0
B: ABS=1000003

设备结点为：
# ll /dev/
crw-rw----    1 root     root      13, 64 Dec 10 2008 event0
crw-rw----    1 root     root      13, 32 Dec 7 2008 mouse0

编译移植成功后,可以使用 tslib 进行测试---->请看下篇<>

附件:

/* drivers/input/touchscreen/s3c2410_ts.c
*
* Touchscreen driver for GEC2440 with Samsung S3C2440A
*
* modify from corgi_ts.c
*
* 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
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include

#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 X_AXIS_MAX   0x3ff
#define X_AXIS_MIN   0
#define Y_AXIS_MAX   0x3ff
#define Y_AXIS_MIN   0
#define PRESSURE_MIN 0
#define PRESSURE_MAX 1

/*
* Definitions & global arrays.
*/

/*
* Per-touchscreen data.
*/
struct ts_event {
short pressure;
short xp;
short yp;
};
struct s3c2410_ts {
struct input_dev *input;
struct resource *res;
struct timer_list timer;
struct ts_event tc;
int pendown;
int count;
int shift;
struct resource *irq_gpio[2];
struct s3c2410_ts_mach_info *machinfo;
};

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(struct s3c2410_ts *s3c2410_ts,unsigned long data)
{
unsigned long data0;
unsigned long data1;
struct input_dev *dev = s3c2410_ts->input;

/* Disable Interrupt */
set_irq_type(s3c2410_ts->irq_gpio[0]->start, IRQT_NOEDGE);
set_irq_type(s3c2410_ts->irq_gpio[1]->start, IRQT_NOEDGE);
   
data0 = readl(base_addr+S3C2410_ADCDAT0);
data1 = readl(base_addr+S3C2410_ADCDAT1);

   s3c2410_ts->pendown = (!(data0 & S3C2410_ADCDAT0_UPDOWN)) && (!(data1 & S3C2410_ADCDAT0_UPDOWN));

   if (s3c2410_ts->pendown) {
    if (s3c2410_ts->count != 0) {
     s3c2410_ts->tc.xp >>= s3c2410_ts->shift;
     s3c2410_ts->tc.yp >>= s3c2410_ts->shift;

#ifdef CONFIG_TOUCHSCREEN_S3C2410_DEBUG

     {
      struct timeval tv;
      do_gettimeofday(&tv);
      printk(KERN_INFO "T: %06d, X: %03x, Y: %03x\n", (int)tv.tv_usec, s3c2410_ts->tc.xp, s3c2410_ts->tc.yp);
     }
#endif
     input_report_abs(dev, ABS_X, s3c2410_ts->tc.xp);
     input_report_abs(dev, ABS_Y, s3c2410_ts->tc.yp);
    input_report_abs(dev, ABS_PRESSURE, s3c2410_ts->tc.pressure);
    input_report_key(dev, BTN_TOUCH, s3c2410_ts->pendown);
    input_sync(dev);
    }

    s3c2410_ts->tc.xp = 0;
    s3c2410_ts->tc.yp = 0;
    s3c2410_ts->count = 0;
   s3c2410_ts->tc.pressure = 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 {
    s3c2410_ts->count = 0;

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

    writel(WAIT4INT(0), base_addr+S3C2410_ADCTSC);
   }
  
/* Enable Falling Edge */
set_irq_type(s3c2410_ts->irq_gpio[0]->start, IRQT_BOTHEDGE);
set_irq_type(s3c2410_ts->irq_gpio[1]->start, IRQT_BOTHEDGE);
}
static void s3c2410_ts_timer(unsigned long data)
{
struct s3c2410_ts *s3c2410ts_data = (struct s3c2410_ts *) data;

touch_timer_fire(s3c2410ts_data, 1);
}

static irqreturn_t stylus_updown(int irq, void *dev_id, struct pt_regs *regs)
{
unsigned long data0;
unsigned long data1;
struct s3c2410_ts *s3c2410_ts = dev_id;

#ifdef CONFIG_TOUCHSCREEN_S3C2410_DEBUG  
printk(KERN_ERR "%s() No.%d line:\n\r",__FUNCTION__,__LINE__);
#endif

data0 = readl(base_addr+S3C2410_ADCDAT0);
data1 = readl(base_addr+S3C2410_ADCDAT1);

s3c2410_ts->pendown = (!(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 (s3c2410_ts->pendown)
   touch_timer_fire(s3c2410_ts, 0);

return IRQ_HANDLED;
}

static irqreturn_t stylus_action(int irq, void *dev_id, struct pt_regs *regs)
{
unsigned long data0;
unsigned long data1;
struct s3c2410_ts *s3c2410_ts = dev_id;

#ifdef CONFIG_TOUCHSCREEN_S3C2410_DEBUG
printk(KERN_ERR "%s() No.%d line:\n\r",__FUNCTION__,__LINE__);
#endif

data0 = readl(base_addr+S3C2410_ADCDAT0);
data1 = readl(base_addr+S3C2410_ADCDAT1);

/*修改处,因为在QT上运行时出现X轴,Y轴掉转,且方向相反,修改了下面X,Y的读取值,源码请看原创!!其实出现这种情况还有一种修改的方法,就是修改QT的源文件,因为QT的坐标读取有问题,所以也可以直接修改QT的QCustomTPanelHandlerPrivate::readMouseData(),具体修改方法可参考网上博客*/

s3c2410_ts->tc.xp += （S3C2410_ADCDAT1_YPDATA_MASK-data1） & S3C2410_ADCDAT1_YPDATA_MASK;
s3c2410_ts->tc.yp += (S3C2410_ADCDAT0_XPDATA_MASK-data0) & S3C2410_ADCDAT0_XPDATA_MASK;
s3c2410_ts->count++;
s3c2410_ts->tc.pressure = 1;

if (s3c2410_ts->count < (1<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(&s3c2410_ts->timer, jiffies + HZ / 100);
   writel(WAIT4INT(1), base_addr+S3C2410_ADCTSC);
}

return IRQ_HANDLED;
}

static struct clk *adc_clock;
/*
* The functions for inserting/removing us as a module.
*/

#define s3c2410ts_suspend   NULL
#define s3c2410ts_resume   NULL
static int __init s3c2410ts_probe(struct platform_device *pdev)
{
struct s3c2410_ts *s3c2410_ts;
struct input_dev *input_dev;
int size;
int err = -ENOMEM;

s3c2410_ts = kzalloc(sizeof(struct s3c2410_ts), GFP_KERNEL);
input_dev = input_allocate_device();
if (!s3c2410_ts || !input_dev)
   goto fail1;

platform_set_drvdata(pdev, s3c2410_ts);

s3c2410_ts->machinfo = pdev->dev.platform_data;
s3c2410_ts->irq_gpio[0] = platform_get_resource(pdev, IORESOURCE_IRQ,0);
s3c2410_ts->irq_gpio[1] = platform_get_resource(pdev, IORESOURCE_IRQ,1);

#ifdef CONFIG_TOUCHSCREEN_S3C2410_DEBUG
printk(KERN_ERR "s3c2410_ts->irq_gpio[0] = %d,IRQ_TC = %d\n",s3c2410_ts->irq_gpio[0]->start,IRQ_TC);
printk(KERN_ERR "s3c2410_ts->irq_gpio[1] = %d,IRQ_ADC = %d\n",s3c2410_ts->irq_gpio[1]->start,IRQ_ADC);
#endif

if ((s3c2410_ts->irq_gpio[0]->start < 0)|(s3c2410_ts->irq_gpio[1]->start < 0)) {
   err = -ENODEV;
   printk(KERN_ERR "Hm... too bad : no irq for ts\n");
   goto fail1;
}
  
    if (!s3c2410_ts->machinfo)
    {
        printk(KERN_ERR "Hm... too bad : no platform data for ts\n");
   return -EINVAL;
    }
s3c2410_ts->res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (s3c2410_ts->res == NULL) {
   printk(KERN_ERR "no memory resource specified\n");
   return -ENOENT;
}

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);
  
size = (s3c2410_ts->res->end-s3c2410_ts->res->start)+1;
base_addr=ioremap(s3c2410_ts->res->start, size);

#ifdef CONFIG_TOUCHSCREEN_S3C2410_DEBUG
printk(KERN_ERR "ioremap %08x to base_addr=%08x , size=%08x\n",s3c2410_ts->res->start,(unsigned int)base_addr,size);
#endif

if (base_addr == NULL) {
        printk(KERN_ERR "Failed to remap register block\n");
        return -ENOMEM;
    }

/* Configure GPIOs */
    s3c2410_ts_connect();
   
#ifdef CONFIG_TOUCHSCREEN_S3C2410_DEBUG
    printk(KERN_ERR "s3c2410_ts->machinfo delay = %d,presc = %d,oversampling_shift = %d\n",
    s3c2410_ts->machinfo->delay,
    s3c2410_ts->machinfo->presc,
    s3c2410_ts->machinfo->oversampling_shift);
#endif

if ((s3c2410_ts->machinfo->presc&0xff) > 0)
        writel(S3C2410_ADCCON_PRSCEN | S3C2410_ADCCON_PRSCVL(s3c2410_ts->machinfo->presc&0xFF),\
        base_addr+S3C2410_ADCCON);
else
        writel(0,base_addr+S3C2410_ADCCON);

    /* Initialise the adcdly registers */
    if ((s3c2410_ts->machinfo->delay&0xffff) > 0)
        writel(s3c2410_ts->machinfo->delay & 0xffff, base_addr+S3C2410_ADCDLY);

writel(WAIT4INT(0), base_addr+S3C2410_ADCTSC);
__raw_writel(__raw_readl(S3C2410_GPGCON)|(0xff<<24), S3C2410_GPGCON);

s3c2410_ts->input = input_dev;

init_timer(&s3c2410_ts->timer);
s3c2410_ts->timer.data = (unsigned long) s3c2410_ts;
s3c2410_ts->timer.function = s3c2410_ts_timer;

// input_dev->private = s3c2410_ts;
input_dev->name = "s3c2410 Touchscreen";
input_dev->phys = "s3c2410ts/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;

s3c2410_ts->shift = s3c2410_ts->machinfo->oversampling_shift;

input_dev->evbit[0] = BIT_MASK(EV_SYN) | 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);

/* Get irqs */
    if (request_irq(s3c2410_ts->irq_gpio[1]->start, stylus_action, IRQF_DISABLED, pdev->name, s3c2410_ts)) {
        printk(KERN_ERR "s3c2410_ts.c: Could not allocate ts IRQ_ADC !\n");
   iounmap(base_addr);
   err = -EBUSY;
   goto fail1;
}
    if (request_irq(s3c2410_ts->irq_gpio[0]->start, stylus_updown, IRQF_DISABLED, pdev->name, s3c2410_ts)) {
        printk(KERN_ERR "s3c2410_ts.c: Could not allocate ts IRQ_TC !\n");
   iounmap(base_addr);
   err = -EBUSY;
   goto fail1;
}
    /* All went ok, so register to the input system */
err = input_register_device(s3c2410_ts->input);
if (err)
   goto fail2;
/* Enable Falling Edge */
set_irq_type(s3c2410_ts->irq_gpio[0]->start, IRQT_BOTHEDGE);
set_irq_type(s3c2410_ts->irq_gpio[1]->start, IRQT_BOTHEDGE);
return 0;

fail2: free_irq(s3c2410_ts->irq_gpio, s3c2410_ts);
fail1: input_free_device(input_dev);
kfree(s3c2410_ts);
return err;
}

static int s3c2410ts_remove(struct platform_device *pdev)
{
struct s3c2410_ts *s3c2410_ts = platform_get_drvdata(pdev);

disable_irq(s3c2410_ts->irq_gpio[0]->start);
disable_irq(s3c2410_ts->irq_gpio[1]->start);
free_irq(s3c2410_ts->irq_gpio[0]->start,s3c2410_ts);
free_irq(s3c2410_ts->irq_gpio[1]->start,s3c2410_ts);
del_timer_sync(&s3c2410_ts->timer);

if (adc_clock) {
   clk_disable(adc_clock);
   clk_put(adc_clock);
   adc_clock = NULL;
}
input_unregister_device(s3c2410_ts->input);
iounmap(base_addr);
kfree(s3c2410_ts);
return 0;
}

static struct platform_driver s3c2410ts_driver = {
.probe   = s3c2410ts_probe,
.remove   = s3c2410ts_remove,
.suspend = s3c2410ts_suspend,
.resume   = s3c2410ts_resume,
.driver   = {
   .name = "s3c2410-ts",
   .owner = THIS_MODULE,
},
};

static int __devinit s3c2410ts_init(void)
{
return platform_driver_register(&s3c2410ts_driver);
}

static void __exit s3c2410ts_exit(void)
{
platform_driver_unregister(&s3c2410ts_driver);
}

module_init(s3c2410ts_init);
module_exit(s3c2410ts_exit);

MODULE_AUTHOR("9g2440");
MODULE_DESCRIPTION("s3c2440 TouchScreen Driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:s3c2410-ts");