#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include //#include
#include
#include
#include /* For ts.dev.id.version */
#define S3C2410TSVERSION 0x0101
#define TSC_SLEEP (S3C2410_ADCTSC_PULL_UP_DISABLE | S3C2410_ADCTSC_XY_PST(0))
#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))
#define DEBUG_LVL KERN_DEBUG
MODULE_AUTHOR("Arnaud Patard <[email=arnaud.patard@rtp-net.org]arnaud.patard@rtp-net.org[/email]>");
MODULE_DESCRIPTION("s3c2410 touchscreen driver");
MODULE_LICENSE("GPL");
/*
* Definitions & global arrays.
*/
/*===================================================================================================
添加进 devs.c ，用于设置触摸屏信息
struct s3c2410_ts_mach_info mini2440_ts_cfg __initdata = {
.delay = 20000, //ADCDLY
.presc = 55, // 分频
.oversampling_shift = 2, // 采样的数据为 1<<2 =4
};
struct platform_device s3c_device_ts={
.name = "s3c2410-ts",
.id = -1,
.dev ={
.platform_data = &mini2440_ts_cfg,
}
};
static struct platform_device *smdk2440_devices[] __initdata = {
&s3c_device_ts,
};
// updown=0 状态表示，设置等待 DOWN 中断
// updown=1 状态表示，设置等待UP中断
=======================================================================================================*/
static char *s3c2410ts_name = "s3c2410 TouchScreen";
/*
* Per-touchscreen data.
*/
struct s3c2410ts {
struct input_dev *dev;
long xp;
long yp;
int count;
int shift;
char phys[32];
};
static struct s3c2410ts ts;
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);
}
/*===========================================================================================
touch_timer_fire这个函数主要实现以下功能：
1、 触摸笔开始点击的时候， 在中断函数stylus_updown里面被调用，
此时缓存区没有数据，ts.count为0, 并且开启AD转换,而后进入 AD 中断
2、 ADC中断函数stylus_action把缓冲区填满的时候，作为中断后半段函数稍后被调用，
此时ts.count为4，算出其平均值后，交给事件处理层(Event Handler)处理，
主要是填写缓冲，然后唤醒等待输入数据的进程。
3、 stylus抬起，等到缓冲区填满后(可能会包含一些无用的数据)被调用，
这时候判断出stylus up，报告stylus up事件，重新等待stylus down。
============================================================================================*/
static void touch_timer_fire(unsigned long data)
{
unsigned long data0;
unsigned long data1;
int updown;
data0 = readl(base_addr+S3C2410_ADCDAT0);
data1 = readl(base_addr+S3C2410_ADCDAT1);
updown = (!(data0 & S3C2410_ADCDAT0_UPDOWN)) && (!(data1 & S3C2410_ADCDAT0_UPDOWN));
// 注意此处 updown 取反了，所以 updown=0 表示设置抬起状态， updown=1 表示设置触摸笔点击状态
if (updown) {
if (ts.count != 0) {
long tmp;
tmp = ts.xp;
ts.xp = ts.yp; // 交换 X,Y 的值
ts.yp = tmp;
// 计算出平均值
ts.xp >>= ts.shift;
ts.yp >>= ts.shift;
#ifdef CONFIG_TOUCHSCREEN_S3C2410_DEBUG
{
struct timeval tv;
do_gettimeofday(&tv);
printk(DEBUG_LVL "T: %06d, X: %03ld, Y: %03ld\n", (int)tv.tv_usec, ts.xp, ts.yp);
}
#endif
input_report_abs(ts.dev, ABS_X, ts.xp);
input_report_abs(ts.dev, ABS_Y, ts.yp);
input_report_key(ts.dev, BTN_TOUCH, 1);
input_report_abs(ts.dev, ABS_PRESSURE, 1);
input_sync(ts.dev);
}
ts.xp = 0;
ts.yp = 0;
ts.count = 0;
writel(S3C2410_ADCTSC_PULL_UP_DISABLE | AUTOPST, base_addr+S3C2410_ADCTSC);
writel(readl(base_addr+S3C2410_ADCCON) | S3C2410_ADCCON_ENABLE_START, base_addr+S3C2410_ADCCON);
}
// 当触摸笔为抬起状态时
else {
ts.count = 0;
input_report_key(ts.dev, BTN_TOUCH, 0);
input_report_abs(ts.dev, ABS_PRESSURE, 0);
input_sync(ts.dev);
// 设置INT 位，等待 DOWN 中断
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 = readl(base_addr+S3C2410_ADCDAT0);
data1 = readl(base_addr+S3C2410_ADCDAT1);
updown = (!(data0 & S3C2410_ADCDAT0_UPDOWN)) && (!(data1 & S3C2410_ADCDAT0_UPDOWN));
/* 判断出stylus down，调用touch_timer_fire函数 */
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 = readl(base_addr+S3C2410_ADCDAT0);
data1 = readl(base_addr+S3C2410_ADCDAT1);
ts.xp += data0 & S3C2410_ADCDAT0_XPDATA_MASK; // 计算坐标和
ts.yp += data1 & S3C2410_ADCDAT1_YPDATA_MASK;
ts.count++;
if (ts.count < (1< {
// 采样未完成，继续下一次采样 ，通过 ENABLE_START 启动 AD 转换，一次一个数据
writel(S3C2410_ADCTSC_PULL_UP_DISABLE | AUTOPST, base_addr+S3C2410_ADCTSC);
writel(readl(base_addr+S3C2410_ADCCON) | S3C2410_ADCCON_ENABLE_START, base_addr+S3C2410_ADCCON);
} else {
/* 缓冲区满， 采样完毕，激活下半部处理程序touch_timer_fire，处理接收数据 */
mod_timer(&touch_timer, jiffies+1);
writel(WAIT4INT(1), base_addr+S3C2410_ADCTSC); // 采样完毕，抬起触摸笔，
}
return IRQ_HANDLED;
}
static struct clk *adc_clock;
/*
* The functions for inserting/removing us as a module.
*/
static int __init s3c2410ts_probe(struct platform_device *pdev)
{
int rc;
struct s3c2410_ts_mach_info *info;
struct input_dev *input_dev;
info = ( struct s3c2410_ts_mach_info *)pdev->dev.platform_data;
if (!info)
{
printk(KERN_ERR "Hm... too bad : no platform data for ts\n");
return -EINVAL;
}
#ifdef CONFIG_TOUCHSCREEN_S3C2410_DEBUG
printk(DEBUG_LVL "Entering s3c2410ts_init\n");
#endif
adc_clock = clk_get(NULL, "adc"); // get adc clock
if (!adc_clock) {
printk(KERN_ERR "failed to get adc clock source\n");
return -ENOENT;
}
clk_enable(adc_clock); // enable adc clock
#ifdef CONFIG_TOUCHSCREEN_S3C2410_DEBUG
printk(DEBUG_LVL "got and enabled clock\n");
#endif
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();
if ((info->presc&0xff) > 0)
writel(S3C2410_ADCCON_PRSCEN | S3C2410_ADCCON_PRSCVL(info->presc&0xFF),\
base_addr+S3C2410_ADCCON);
else
writel(0,base_addr+S3C2410_ADCCON); // configure prescale of div
/* Initialise registers */
if ((info->delay&0xffff) > 0)
writel(info->delay & 0xffff, base_addr+S3C2410_ADCDLY); // configure ADCDLY
writel(WAIT4INT(0), base_addr+S3C2410_ADCTSC); // 设置updown=0,等待触摸笔点击状态
/* Initialise input stuff */
memset(&ts, 0, sizeof(struct s3c2410ts));
input_dev = input_allocate_device();
if (!input_dev) {
printk(KERN_ERR "Unable to allocate the input device !!\n");
return -ENOMEM;
}
sprintf(ts.phys, "ts0");
ts.dev=input_dev;
ts.dev->evbit[0] = BIT(EV_SYN) | BIT(EV_KEY) | BIT(EV_ABS);
ts.dev->keybit[LONG(BTN_TOUCH)] = BIT(BTN_TOUCH);
input_set_abs_params(ts.dev, ABS_X, 0, 0x3FF, 0, 0);
input_set_abs_params(ts.dev, ABS_Y, 0, 0x3FF, 0, 0);
input_set_abs_params(ts.dev, ABS_PRESSURE, 0, 1, 0, 0);
ts.dev->name = s3c2410ts_name;
ts.dev->id.bustype = BUS_RS232;
ts.dev->id.vendor = 0xDEAD;
ts.dev->id.product = 0xBEEF;
ts.dev->id.version = S3C2410TSVERSION;
ts.shift = info->oversampling_shift;
/* Get irqs */
if (request_irq(IRQ_ADC, stylus_action,IRQF_SAMPLE_RANDOM, "s3c2410_action", ts.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", ts.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 */
rc=input_register_device(ts.dev);
if (rc)
{
free_irq(IRQ_TC, ts.dev);
free_irq(IRQ_ADC, ts.dev);
clk_disable(adc_clock);
iounmap(base_addr);
return -EIO;
}
return 0;
}
static int s3c2410ts_remove(struct platform_device *pdev)
{
disable_irq(IRQ_ADC);
disable_irq(IRQ_TC);
free_irq(IRQ_TC,ts.dev);
free_irq(IRQ_ADC,ts.dev);
if (adc_clock) {
clk_disable(adc_clock);
clk_put(adc_clock);
adc_clock = NULL;
}
input_unregister_device(ts.dev);
iounmap(base_addr);
return 0;
}
#ifdef CONFIG_PM
static int s3c2410ts_suspend(struct platform_device *pdev, pm_message_t state)
{
writel(TSC_SLEEP, base_addr+S3C2410_ADCTSC);
writel(readl(base_addr+S3C2410_ADCCON) | S3C2410_ADCCON_STDBM,base_addr+S3C2410_ADCCON);
disable_irq(IRQ_ADC);
disable_irq(IRQ_TC);
clk_disable(adc_clock);
return 0;
}
static int s3c2410ts_resume(struct platform_device *pdev)
{
struct s3c2410_ts_mach_info *info =
( struct s3c2410_ts_mach_info *)pdev->dev.platform_data;
clk_enable(adc_clock);
msleep(1);
enable_irq(IRQ_ADC);
enable_irq(IRQ_TC);
if ((info->presc&0xff) > 0)
writel(S3C2410_ADCCON_PRSCEN | S3C2410_ADCCON_PRSCVL(info->presc&0xFF),base_addr+S3C2410_ADCCON);
else
writel(0,base_addr+S3C2410_ADCCON);
/* Initialise registers */
if ((info->delay&0xffff) > 0)
writel(info->delay & 0xffff, base_addr+S3C2410_ADCDLY);
writel(WAIT4INT(0), base_addr+S3C2410_ADCTSC);
return 0;
}
#else
#define s3c2410ts_suspend NULL
#define s3c2410ts_resume NULL
#endif
static struct platform_driver s3c2410ts_driver = {
.driver ={
.name = "s3c2410-ts",
.owner = THIS_MODULE,
},
.probe = s3c2410ts_probe,
.remove = s3c2410ts_remove,
.suspend = s3c2410ts_suspend,
.resume = s3c2410ts_resume,
};
int __init s3c2410ts_init(void)
{
return platform_driver_register(&s3c2410ts_driver);
}
void __exit s3c2410ts_exit(void)
{
platform_driver_unregister(&s3c2410ts_driver);
}
module_init(s3c2410ts_init);
module_exit(s3c2410ts_exit);
/* linux/include/asm-arm/arch-s3c2410/s3c2410_ts.h
*
* Copyright (c) 2005 Arnaud Patard
*
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
*
* Changelog:
* 24-Mar-2005 RTP Created file
* 03-Aug-2005 RTP Renamed to ts.h
*/#ifndef __ASM_ARM_TS_H
#define __ASM_ARM_TS_H
struct s3c2410_ts_mach_info {
int delay;
int presc;
int oversampling_shift;
};
void __init set_s3c2410ts_info(struct s3c2410_ts_mach_info *hard_s3c2410ts_info);
#endif /* __ASM_ARM_TS_H */
