linux2.6.30.4 內核移植（2）觸摸屏驅動

4.觸摸屏驅動移植

guolele:其中s3c2410_ts.c是用輸入子系統寫成的,這裏我給出我寫的一個。

#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> #include <asm/ts.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 struct semaphore ADC_LOCK; static int OwnADC = 0; 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 = 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; /*取4次平均值*/ xp >>= 2; yp >>= 2; /*上報座標*/ 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; /* 啓動AD 轉換*/ 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 ==1, 按下OR 彈起???*/ 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)) { /* 再一次啓動AD轉換*/ 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; init_MUTEX(&ADC_LOCK); 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);

 

修改arch/arm/mach-s3c2410/mach-smdk2410.c，添加

static struct s3c2410ts_mach_info s3c2410_tscfg __initdata = {

.delay = 10000,

.presc = 49,

.oversampling_shift = 2,

};

修改static struct platform_device *smdk2410_devices[] __initdata

加入

&s3c_device_ts,

在static void __init smdk2410_init(void)中加入：

s3c24xx_ts_set_platdata(&s3c2410_tscfg);

 

arch/arm/plat-s3c/include/plat/devs.h 中加入

extern struct platform_device s3c_device_ts;

 

在driver/input/touchscreen/下添加s3c2410-ts.c文件

 

在 include/asm-arm/ 下添加 ts.h 文件， 內容如下：

 

#ifndef __ASM_ARM_S3C2410_TS_H

#define __ASM_ARM_S3C2410_TS_H

 

struct s3c2410ts_mach_info {

int delay;

int presc;

int oversampling_shift;

 

};

 

extern void __init s3c24xx_ts_set_platdata(struct s3c2410ts_mach_info *);

 

#endif /* __ASM_ARM_S3C2410_TS_H */

 

修改arch/arm/plat-s3c24xx/devs.c，加入

 

/* Touch Screen Controller */

struct platform_device s3c_device_ts = {

.name = "s3c2410-ts",

.id = -1,

};

 

EXPORT_SYMBOL(s3c_device_ts);

 

void __init s3c24xx_ts_set_platdata(struct s3c2410ts_mach_info *pd)

{

struct s3c2410ts_mach_info *npd;

 

npd = kmalloc(sizeof(*npd), GFP_KERNEL);

if (npd) {

memcpy(npd, pd, sizeof(*npd));

s3c_device_ts.dev.platform_data = npd;

} else {

printk(KERN_ERR "no memory for TS platform data/n");

}

}

 

修改drivers/input/touchscreen/Kconfig，在if INPUT_TOUCHSCREEN下加入

config TOUCHSCREEN_S3C2410

tristate “s3c2410 touchscreen”

depends on ARCH_SMDK2410

default y

help

This is used for supporting s3c2410 touchscreen.

 

arch/arm/mach-s3c2410/mach-smdk2410.c:143: error: variable `s3c2410_tscfg' has initializer but incomplete type

 

./include/asm/ts.h:struct s3c2410ts_mach_info {

./include/asm/ts.h:extern void __init s3c24xx_ts_set_platdata(struct s3c2410ts_mach_info *);

./include/asm-arm/ts.h:struct s3c2410ts_mach_info {

./include/asm-arm/ts.h:extern void __init s3c24xx_ts_set_platdata(struct s3c2410ts_mach_info *);

 

arch/arm/mach-s3c2410/mach-smdk2410.c 中

添加 #include <asm/ts.h> 或 #include <asm-arm/ts.h>

 

arch/arm/plat-s3c24xx/devs.c: In function `s3c24xx_ts_set_platdata':

arch/arm/plat-s3c24xx/devs.c:520: error: dereferencing pointer to incomplete type

arch/arm/plat-s3c24xx/devs.c中添加

#include <asm/ts.h>

 

drivers/input/touchscreen/s3c2410-ts.c:21:35: asm/plat-s3c/regs-adc.h: 沒有該文件或目錄

drivers/input/touchscreen/s3c2410-ts.c:22:33: asm/arch/regs-gpio.h: 沒有該文件或目錄

drivers/input/touchscreen/s3c2410-ts.c:23:26: asm/arch/ts.h: 沒有該文件或目錄

 

./arch/arm/plat-s3c/include/plat/regs-adc.h

./arch/arm/mach-s3c2410/include/mach/regs-gpio.h

./arch/arm/plat-s3c64xx/include/plat/regs-gpio.h

./arch/arm/mach-ks8695/include/mach/regs-gpio.h

 

drivers/input/touchscreen/s3c2410-ts.c中添加

#include <plat/regs-adc.h>

#include <mach/regs-gpio.h>

#include <asm/ts.h>