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2012年(1008)

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2012-08-01 11:04:41

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

触摸屏驱动,在TX2440A开发板上做测试

维护记录:  2010-06-10  V1.0   

linux内核:2.6.31

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

#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))

 

static char *s3c2410ts_name = "s3c2410 TouchScreen";

 

static struct input_dev *dev;

static long xp;

static long yp;

static int count;

 

extern struct semaphore ADC_LOCK;

static int OwnADC = 0;

 

static void __iomem *base_addr;

 

static inline void s3c2410_ts_connect(void)

{

    s3c2410_gpio_cfgpin(S3C2410_GPG(12), S3C2410_GPG12_XMON);

    s3c2410_gpio_cfgpin(S3C2410_GPG(13), S3C2410_GPG13_nXPON);

    s3c2410_gpio_cfgpin(S3C2410_GPG(14), S3C2410_GPG14_YMON);

    s3c2410_gpio_cfgpin(S3C2410_GPG(15), 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 s3c2410ts_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 */

    s3c2410_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 = 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_SHARED|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);

 

 源代码: 触摸屏驱动.rar   

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