在内核中添加触摸屏驱动程序
编者&＃xff1a;linux2.6.32并没有带S3C2440触摸屏驱动程序&＃xff0c;需要自己实现。而在此的触摸屏驱动程序时作为一个输入设备来实现的。在linux中&＃xff0c;对于输入设备而言&＃xff0c;内核专为其设计了输入子系统&＃xff0c;由核心层处理公共的工作。因为对于输入设备而言&＃xff0c;只是中断、读键值/坐标值是与设备相关的&＃xff0c;其余的如输入事件的缓冲区的管理以及字符设备驱动的file_operations接口则是输入设备通用的。所以在此是在输入子系统的框架下进行编写触摸屏驱动程序。对于这个驱动的移植以及讲解&＃xff0c;参考了网上的一些文章&＃xff0c;一部分摒弃了手册。
1 在内核中添加触摸屏驱动程序
Linux-2.6.32.2 内核也没有包含支持S3C2440 的触摸屏驱动&＃xff0c;因此我们自行设计了一个s3c2410_ts.c&＃xff0c;它位于linux-src/drivers/input/touchscreen 目录下&＃xff0c;你可以自己增加一个s3c2410_ts.c 文件&＃xff0c;并复制如下内容&＃xff1a;
#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 &＃61; "s3c2410 TouchScreen";
static struct input_dev *dev;
static long xp;
static long yp;
static int count;
extern struct semaphore ADC_LOCK;
static int OwnADC &＃61; 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 &＃61; ioread32(base_addr&＃43;S3C2410_ADCDAT0);
data1 &＃61; ioread32(base_addr&＃43;S3C2410_ADCDAT1);
updown &＃61; (!(data0 & S3C2410_ADCDAT0_UPDOWN)) && (!(data1 & S3C2410_ADCDAT0_UPDOWN));
if (updown) {
if (count !&＃61; 0) {
long tmp;
tmp &＃61; xp;
xp &＃61; yp;
yp &＃61; tmp;
xp >>&＃61; 2;
yp >>&＃61; 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 &＃61; 0;
yp &＃61; 0;
count &＃61; 0;
iowrite32(S3C2410_ADCTSC_PULL_UP_DISABLE | AUTOPST, base_addr&＃43;S3C2410_ADCTSC);
iowrite32(ioread32(base_addr&＃43;S3C2410_ADCCON) | S3C2410_ADCCON_ENABLE_START,
base_addr&＃43;S3C2410_ADCCON);
} else {
count &＃61; 0;
input_report_key(dev, BTN_TOUCH, 0);
input_report_abs(dev, ABS_PRESSURE, 0);
input_sync(dev);
iowrite32(WAIT4INT(0), base_addr&＃43;S3C2410_ADCTSC);
if (OwnADC) {
OwnADC &＃61; 0;
up(&ADC_LOCK);
}
}
}
static struct timer_list touch_timer &＃61;
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) &＃61;&＃61; 0) {
OwnADC &＃61; 1;
data0 &＃61; ioread32(base_addr&＃43;S3C2410_ADCDAT0);
data1 &＃61; ioread32(base_addr&＃43;S3C2410_ADCDAT1);
updown &＃61; (!(data0 & S3C2410_ADCDAT0_UPDOWN)) && (!(data1 &
S3C2410_ADCDAT0_UPDOWN));
if (updown) {
touch_timer_fire(0);
} else {
OwnADC &＃61; 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 &＃61; ioread32(base_addr&＃43;S3C2410_ADCDAT0);
data1 &＃61; ioread32(base_addr&＃43;S3C2410_ADCDAT1);
xp &＃43;&＃61; data0 & S3C2410_ADCDAT0_XPDATA_MASK;
yp &＃43;&＃61; data1 & S3C2410_ADCDAT1_YPDATA_MASK;
count&＃43;&＃43;;
if (count <(1<<2)) {
iowrite32(S3C2410_ADCTSC_PULL_UP_DISABLE | AUTOPST,
base_addr&＃43;S3C2410_ADCTSC);
iowrite32(ioread32(base_addr&＃43;S3C2410_ADCCON) | S3C2410_ADCCON_ENABLE_START,
base_addr&＃43;S3C2410_ADCCON);
} else {
mod_timer(&touch_timer, jiffies&＃43;1);
iowrite32(WAIT4INT(1), base_addr&＃43;S3C2410_ADCTSC);
}
}
return IRQ_HANDLED;
}
static struct clk *adc_clock;
static int __init s3c2410ts_init(void)
{
struct input_dev *input_dev;
adc_clock &＃61; 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&＃61;ioremap(S3C2410_PA_ADC,0x20);
if (base_addr &＃61;&＃61; 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&＃43;S3C2410_ADCCON);
iowrite32(0xffff, base_addr&＃43;S3C2410_ADCDLY);
iowrite32(WAIT4INT(0), base_addr&＃43;S3C2410_ADCTSC);
/* Initialise input stuff */
input_dev &＃61; input_allocate_device();
if (!input_dev) {
printk(KERN_ERR "Unable to allocate the input device !!\n");
return -ENOMEM;
}
dev &＃61; input_dev;
dev->evbit[0] &＃61; BIT(EV_SYN) | BIT(EV_KEY) | BIT(EV_ABS);
dev->keybit[BITS_TO_LONGS(BTN_TOUCH)] &＃61; 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 &＃61; s3c2410ts_name;
dev->id.bustype &＃61; BUS_RS232;
dev->id.vendor &＃61; 0xDEAD;
dev->id.product &＃61; 0xBEEF;
dev->id.version &＃61; 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 &＃61; NULL;
}
input_unregister_device(dev);
iounmap(base_addr);
}
module_init(s3c2410ts_init);
module_exit(s3c2410ts_exit);
然后在linux-2.6.32.2/drivers/input/touchscreen/Makefile 文件中添加该源代码的目标模块&＃xff0c;如图红色部分&＃xff1a;
obj-$(CONFIG_TOUCHSCREEN_WM97XX_ZYLONITE) &＃43;&＃61; zylonite-wm97xx.o
obj-$(CONFIG_TOUCHSCREEN_W90X900) &＃43;&＃61; w90p910_ts.o
obj-$(CONFIG_TOUCHSCREEN_PCAP) &＃43;&＃61; pcap_ts.o
obj-$(CONFIG_TOUCHSCREEN_S3C2410) &＃43;&＃61; s3c2410_ts.o
再打开linux-2.6.32.2/drivers/input/touchscreen/Kconfig 文件&＃xff0c;加入如下红色部分&＃xff0c;这样就在内核配置中添加了mini2440 的触摸屏驱动选项&＃xff1a;
menuconfig INPUT_TOUCHSCREEN
bool "Touchscreens"
help
Say Y here, and a list of supported touchscreens will be displayed.
This option doesn&＃39;t affect the kernel.
If unsure, say Y.
if INPUT_TOUCHSCREEN
config TOUCHSCREEN_S3C2410
tristate "Samsung S3C2410 touchscreen input driver"
depends on MACH_MINI2440 && INPUT && INPUT_TOUCHSCREEN && MINI2440_ADC
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_ADS7846
tristate "ADS7846/TSC2046 and ADS7843 based touchscreens"
depends on SPI_MASTER
depends on HWMON &＃61; n || HWMON
help
至此&＃xff0c;我们就已经在内核中添加完了触摸屏驱动。
2 配置编译内核并测试触摸屏驱动
在命令行执行&＃xff1a;make menuconfig&＃xff0c;然后依次选择如下子菜单&＃xff0c;找到刚刚添加的触摸屏驱动选项&＃xff1a;
Device Drivers --->
Input device support --->
[*] Touchscreens --->
按空格键选中触摸屏驱动配置选项&＃xff1a;退出并保存以上内核配置&＃xff0c;在命令行输入&＃xff1a;make zImage&＃xff0c;将生成arch/arm/boot/zImage文件&＃xff0c;使用supervivi 的“k”命令把它烧写到开发板。在此我们还是使用缺省的文件系统root_qtopia&＃xff0c;可以看到屏幕上出现校正界面&＃xff1a;依照屏幕提示&＃xff0c;使用触摸笔逐步点击“十”型交叉点&＃xff0c;即可进入qtopia 系统。
3、触摸屏驱动程序的详细分析。
这个内容由于较多&＃xff0c;放在下一个文章里&＃xff0c;见下链接。
linux-2.6.32在mini2440开发板上移植(10)之触摸屏工作原理以及驱动程序详细分析。 http://www.linuxidc.com/Linux/2013-04/82383p10.htm
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