s3c2410_ts.c

#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 *s3c2410ts_name = "s3c2410 TouchScreen";

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

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 = __raw_readl(base_addr+S3C2410_ADCDAT0);
      data1 = __raw_readl(base_addr+S3C2410_ADCDAT1);

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

     if (updown) {
         if (count != 0) {
            long 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);
            printk("Debug ++++ %s ++++ xp=%d,yp=%d\n",__func__,xp,yp);
         }

         xp = 0;
         yp = 0;
         count = 0;

         __raw_writel(S3C2410_ADCTSC_PULL_UP_DISABLE | AUTOPST, base_addr+S3C2410_ADCTSC);
         __raw_writel(__raw_readl(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);

         __raw_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)
{
    unsigned long data0;
    unsigned long data1;
    int updown;


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

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

    if (updown) {
        touch_timer_fire(0);
    }

    return IRQ_HANDLED;
}


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


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

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

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

    return IRQ_HANDLED;
}

static struct clk    *adc_clock;

static int __init s3c2410ts_init(void)
{
    struct input_dev *input_dev;
    printk("Debug ++++++++++++ %s +++++++++++++++\n", __func__);
    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 */
    s3c2410_ts_connect();

    __raw_writel(S3C2410_ADCCON_PRSCEN | S3C2410_ADCCON_PRSCVL(0xFF),\
         base_addr+S3C2410_ADCCON);
    __raw_writel(0xffff, base_addr+S3C2410_ADCDLY);
    __raw_writel(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 = s3c2410ts_name;
    dev->id.bustype = BUS_RS232;
    dev->id.vendor = 0xDEAD;
    dev->id.product = 0xBEEF;
    dev->id.version = S3C2410TSVERSION;


    /* Get irqs */
    if (request_irq(IRQ_ADC, stylus_action, IRQF_SAMPLE_RANDOM,
        "s3c2410_action", 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, IRQF_SAMPLE_RANDOM,
            "s3c2410_action", 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(dev);

    return 0;
}

static void __exit s3c2410ts_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(s3c2410ts_init);
module_exit(s3c2410ts_exit);

 

//Lcd_Port_Init();

LTV350QV_Power_ON();

//Lcd_Init();
//Lcd_EnvidOnOff(1);  
//Lcd_ClearScr(0xffff)
  
dprintk("111-------------------11\n");
return 0;

我的很特别除了要搞老师教的。还要改驱动，还要屏蔽其中的这几行。
关键是看你的屏幕是什么类型的。我的是LTV350QV，