Fs2410上基于linux触摸屏的移植

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Fs2410上基于linux触摸屏的移植

device 设备的增加

增加如下的两个结构:

static struct platform_device s3c_ts = {

.name = "s3c2410ts",

.id = 4,

.num_resources = 0,

.resource = NULL,

};

static struct platform_device *smdk2410_devices[] __initdata = {

&s3c_device_usb,

&s3c_device_lcd,

&s3c_device_wdt,

&s3c_device_i2c,

&s3c_device_iis,

&s3c_device_ts, //在平台设备中增加如下的结构；

};

Driver的增加

static struct device_drivers3c2410ts_driver = {

.name = DEVICE_NAME,

.bus = &platform_bus_type,

.probe = s3c2410ts_probe,

};

static int __init s3c2410ts_init(void)

{

int ret;

printk(KERN_EMERG "s3c2410ts init\n");

ret = driver_register(&s3c2410ts_driver);

return ret;

}

tatic void __exit s3c2410ts_exit(void)

{

unregister_chrdev(tsMajor, DEVICE_NAME);

free_irq(IRQ_ADC, s3c2410_isr_adc);

free_irq(IRQ_TC, s3c2410_isr_tc);

driver_unregister(&s3c2410ts_driver);

}

module_init(s3c2410ts_init);

module_exit(s3c2410ts_exit);

具体的驱动函数操作

1.probe注册函数

static int s3c2410ts_probe(struct device *dev)

{

unsigned long SRCPND ;

unsigned long INTMOD ;

unsigned long INTMSK;

unsigned long INTPND ;

unsigned long INTOFFSET ;

unsigned long SUBSRCPND ;

unsigned long INTSUBMSK ;

unsigned long EINTMASK ;

unsigned long EINTPEND ;

struct clk *adc_clock;

int ret;

printk(KERN_EMERG "s3c2410ts in probe\n");

tsEvent = tsEvent_dummy;

ret = register_chrdev(0, DEVICE_NAME, &s3c2410_fops);

if (ret < 0) {

printk(DEVICE_NAME " can't get major number\n");

return ret;

}

tsMajor = ret;

printk("%s device driver MAJOR:%d\n", DEVICE_NAME, tsMajor);

adc_clock = clk_get(NULL, "adc");

if (!adc_clock) {

printk(KERN_EMERG "S3C2410 failed to get adc clock source ");

return -ENOENT;

}

else

{

printk(KERN_EMERG "S3C2410 SUCCESS to get adc clock source ");

}

// clk_use(adc_clock);//这个在高版本下已经不需要了

clk_enable(adc_clock);

__raw_writel(__raw_readl(S3C2410_GPGCON)|(0xff<<24), S3C2410_GPGCON);

__raw_writel(30000, S3C2410_ADCDLY); //added by hzh

/* Enable touch interrupt */

ret = request_irq(IRQ_ADC, s3c2410_isr_adc,IRQF_DISABLED/* SA_INTERRUPT*/,

DEVICE_NAME, NULL);

if (ret) goto adc_failed;

ret = request_irq(IRQ_TC, s3c2410_isr_tc,IRQF_DISABLED/* SA_INTERRUPT*/,

DEVICE_NAME, NULL);

if (ret) goto tc_failed;

/* Wait for touch screen interrupts */

wait_down_int();

return 0;

tc_failed:

free_irq(IRQ_ADC, s3c2410_isr_adc);

adc_failed:

return ret;

}

2.两个中断函数

static irq_handler_t s3c2410_isr_adc(int irq, void *dev_id, struct pt_regs *reg)

{

printk(KERN_EMERG "s3c2410_isr_adc\n");

spin_lock_irq(&(tsdev.lock));

if (tsdev.penStatus == PEN_UP)

s3c2410_get_XY();

spin_unlock_irq(&(tsdev.lock));

return IRQ_HANDLED;

}

static irqreturn_t s3c2410_isr_tc(int irq, void *dev_id, struct pt_regs *reg)

{

printk(KERN_EMERG "s3c2410_isr_tc\n");

spin_lock_irq(&(tsdev.lock));

if (tsdev.penStatus == PEN_UP) {

ts_r_idx = 0; //add by hzh

ts_r_beg = 5;

start_ts_adc();

} else {

tsdev.penStatus = PEN_UP;

DPRINTK("PEN UP: x: %08d, y: %08d\n", x, y);

wait_down_int();

tsEvent();

}

spin_unlock_irq(&(tsdev.lock));

return IRQ_HANDLED;

}

无法触发ADC中断的原因

由于linux使用了节电的处理，所以部分设备没有时钟，所以需要动态的启动。

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