上小节我们讲解了android多点触摸屏驱动程序的理论框架，该小节我们开始编写代码，把多点触摸屏驱动的框架编写完成。下面是单点触摸屏（电阻屏），与多点触摸屏（电容屏的一个对比）： 
我们主要以讲解android系统为目的，所以驱动部分就不再进行讲解，下面是SDK\kernel\drivers\input\touchscreen\gslx680.c
/*
* drivers/input/touchscreen/gslX680.c
*
* Copyright (c) 2012 Shanghai Basewin
* Guan Yuwei
*
* 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.
*/
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include "tp_suspend.h"
#include "gslx680.h"
extern unsigned char root_config[32];
static int REPORT_DATA_ANDROID_4_0 = 1;
static int is_linux = 0; //为了程序的方便移植。分为了linux与安卓我们只需要关注linux即可
static int MAX_FINGERS = 10;
static int MAX_CONTACTS = 10;
//#define GSL_DEBUG
//#define GSL_MONITOR
//#define HAVE_TOUCH_KEY
//#define SLEEP_CLEAR_POINT
//#define FILTER_POINT
#ifdef FILTER_POINT
#define FILTER_MAX 9
#endif
#define GSLX680_I2C_NAME "gslX680"
#define GSLX680_I2C_ADDR 0x40
#define IRQ_PORT PB_PIO_IRQ(CFG_IO_TOUCH_PENDOWN_DETECT)//IRQ_EINT(8)
#define GSL_DATA_REG 0x80
#define GSL_STATUS_REG 0xe0
#define GSL_PAGE_REG 0xf0
#define PRESS_MAX 255
#define DMA_TRANS_LEN 0x20
#ifdef GSL_MONITOR
static struct delayed_work gsl_monitor_work;
static struct workqueue_struct *gsl_monitor_workqueue = NULL;
static u8 int_1st[4] = {0};
static u8 int_2nd[4] = {0};
static char dac_counter = 0;
static char b0_counter = 0;
static char bc_counter = 0;
static char i2c_lock_flag = 0;
#endif
static struct gsl_ts *gts;
static struct i2c_client *gsl_client = NULL;
#ifdef HAVE_TOUCH_KEY
static u16 key = 0;
static int key_state_flag = 0;
struct key_data {
u16 key;
u16 x_min;
u16 x_max;
u16 y_min;
u16 y_max;
};
const u16 key_array[]={
KEY_BACK,
KEY_HOME,
KEY_MENU,
KEY_SEARCH,
};
#define MAX_KEY_NUM (sizeof(key_array)/sizeof(key_array[0]))
struct key_data gsl_key_data[MAX_KEY_NUM] = {
{KEY_BACK, 2048, 2048, 2048, 2048},
{KEY_HOME, 2048, 2048, 2048, 2048},
{KEY_MENU, 2048, 2048, 2048, 2048},
{KEY_SEARCH, 2048, 2048, 2048, 2048},
};
#endif
struct gsl_ts_data {
u8 x_index;
u8 y_index;
u8 z_index;
u8 id_index;
u8 touch_index;
u8 data_reg;
u8 status_reg;
u8 data_size;
u8 touch_bytes;
u8 update_data;
u8 touch_meta_data;
u8 finger_size;
};
/*触摸屏数据结构体*/
static struct gsl_ts_data devices[] = {
{
.x_index = 6,
.y_index = 4,
.z_index = 5,
.id_index = 7,
.data_reg = GSL_DATA_REG,
.status_reg = GSL_STATUS_REG,
.update_data = 0x4,
.touch_bytes = 4,
.touch_meta_data = 4,
.finger_size = 70,
},
};
struct gsl_ts {
struct i2c_client *client;
struct input_dev *input;
struct work_struct work;
struct workqueue_struct *wq;
struct gsl_ts_data *dd;
u8 *touch_data;
u8 device_id;
int irq;
int irq_pin;
int rst_pin;
int rst_val;
struct work_struct resume_work;
};
#ifdef GSL_DEBUG
#define print_info(fmt, args...) \
do{ \
printk(fmt, ##args); \
}while(0)
#else
#define print_info(fmt, args...)
#endif
static u32 id_sign[10+1] = {0};
static u8 id_state_flag[10+1] = {0};
static u8 id_state_old_flag[10+1] = {0};
static u16 x_old[10+1] = {0};
static u16 y_old[10+1] = {0};
static u16 x_new = 0;
static u16 y_new = 0;
static int gslX680_init(void)
{
/* shutdown pin */
gpio_request(gts->rst_pin, "reset-gpio");
mdelay(5);
if (gpio_is_valid(gts->rst_pin)) {
gpio_set_value(gts->rst_pin,0);
}
mdelay(50);
if (gpio_is_valid(gts->rst_pin)) {
gpio_set_value(gts->rst_pin,1);
}
mdelay(5);
/* config interrupt pin */
return 0;
}
static int gslX680_shutdown_low(void)
{
if (gpio_is_valid(gts->rst_pin)) {
gpio_set_value(gts->rst_pin,0);
}
return 0;
}
static int gslX680_shutdown_high(void)
{
if (gpio_is_valid(gts->rst_pin)) {
gpio_set_value(gts->rst_pin,1);
}
return 0;
}
static inline u16 join_bytes(u8 a, u8 b)
{
u16 ab = 0;
ab = ab | a;
ab = ab flags & I2C_M_TEN;
xfer_msg[0].buf = ®
xfer_msg[1].addr = client->addr;
xfer_msg[1].len = num;
xfer_msg[1].flags |= I2C_M_RD;
xfer_msg[1].buf = buf;
if (reg adapter, xfer_msg, ARRAY_SIZE(xfer_msg));
msleep(5);
}
return i2c_transfer(client->adapter, xfer_msg, ARRAY_SIZE(xfer_msg)) == ARRAY_SIZE(xfer_msg) ? 0 : -EFAULT;
}
#endif
static u32 gsl_write_interface(struct i2c_client *client, const u8 reg, u8 *buf, u32 num)
{
struct i2c_msg xfer_msg[1];
buf[0] = reg;
xfer_msg[0].addr = client->addr;
xfer_msg[0].len = num + 1;
xfer_msg[0].flags = client->flags & I2C_M_TEN;
xfer_msg[0].buf = buf;
return i2c_transfer(client->adapter, xfer_msg, 1) == 1 ? 0 : -EFAULT;
}
static int gsl_ts_write(struct i2c_client *client, u8 addr, u8 *pdata, int datalen)
{
int ret = 0;
u8 tmp_buf[128];
unsigned int bytelen = 0;
if (datalen > 125)
{
printk("%s too big datalen = %d!\n", __func__, datalen);
return -1;
}
tmp_buf[0] = addr;
bytelen++;
if (datalen != 0 && pdata != NULL)
{
memcpy(&tmp_buf[bytelen], pdata, datalen);
bytelen += datalen;
}
ret = i2c_master_send(client, tmp_buf, bytelen);
return ret;
}
int gsl_ts_readbyte(struct i2c_client *client, u8 addr, u8 *pdata)
{
int ret = 0;
ret = gsl_ts_write(client, addr, NULL, 0);
if (ret 126)
{
printk("%s too big datalen = %d!\n", __func__, datalen);
return -1;
}
for(i=0; i FILTER_MAX)
filter_step_y = y_err;
}
if(x_err = 2;
filter_step_y >>= 2;
}
else if(x_err = 1;
filter_step_y >>= 1;
}
else if(x_err y_old[id] ? (y_old[id] + filter_step_y) : (y_old[id] - filter_step_y);
x_old[id] = x_new;
y_old[id] = y_new;
}
#else
/*上报坐标数据*/
static void record_point(u16 x, u16 y , u8 id)
{
u16 x_err =0;
u16 y_err =0;
id_sign[id]=id_sign[id]+1;
if(id_sign[id]==1){
x_old[id]=x;
y_old[id]=y;
}
x = (x_old[id] + x)/2;
y = (y_old[id] + y)/2;
if(x>x_old[id]){
x_err=x -x_old[id];
}
else{
x_err=x_old[id]-x;
}
if(y>y_old[id]){
y_err=y -y_old[id];
}
else{
y_err=y_old[id]-y;
}
if( (x_err > 3 && y_err > 1) || (x_err > 1 && y_err > 3) ){
x_new = x; x_old[id] = x;
y_new = y; y_old[id] = y;
}
else{
if(x_err > 3){
x_new = x; x_old[id] = x;
}
else
x_new = x_old[id];
if(y_err> 3){
y_new = y; y_old[id] = y;
}
else
y_new = y_old[id];
}
if(id_sign[id]==1){
x_new= x_old[id];
y_new= y_old[id];
}
}
#endif
#ifdef HAVE_TOUCH_KEY
/*上报按键数据*/
static void report_key(struct gsl_ts *ts, u16 x, u16 y)
{
u16 i = 0;
for(i = 0; i 0)
{
input_report_abs(ts->input, ABS_X, x);
input_report_abs(ts->input, ABS_Y, y); //设置触摸屏支持上报绝对位移事件y轴
if(pressure != 0)
input_report_key(ts->input, BTN_TOUCH, 1);
else
input_report_key(ts->input, BTN_TOUCH, 0);
input_sync(ts->input);
}
else
{
input_report_abs(ts->input, ABS_MT_PRESSURE, id);
input_report_abs(ts->input, ABS_MT_TOUCH_MAJOR, 1);
input_report_abs(ts->input, ABS_MT_POSITION_X, x);
input_report_abs(ts->input, ABS_MT_POSITION_Y, y);
input_mt_sync(ts->input);
}
}
/*获取数据并且上报数据*/
static void gslX680_ts_worker(struct work_struct *work)
{
struct gsl_ts *ts = container_of(work, struct gsl_ts,work);
int rc, i;
u8 id, touches;
u16 x, y;
#ifdef GSL_NOID_VERSION
u32 tmp1;
u8 buf[4] = {0};
struct gsl_touch_info cinfo;
memset(&cinfo, 0, sizeof(struct gsl_touch_info)); //对结构体清零操作
#endif
print_info("=====gslX680_ts_worker=====\n");
#ifdef GSL_MONITOR
if(i2c_lock_flag != 0) //判断I2C是否上锁，
goto i2c_lock_schedule; //如果上锁使能中断跳出该函数
else
i2c_lock_flag = 1; //没有上锁则上锁
#endif
rc = gsl_ts_read(ts->client, 0x80, &ts->touch_data[0], 4);
if (rc client->dev, "read failed\n");
goto schedule;
}
touches = ts->touch_data[ts->dd->touch_index]; //获取上报几个触摸点的数据
//获取数据，最多获取九个点的数据
if(touches > 0)
gsl_ts_read(ts->client, 0x84, &ts->touch_data[4], 4);
if(touches > 1)
gsl_ts_read(ts->client, 0x88, &ts->touch_data[8], 4);
if(touches > 2)
gsl_ts_read(ts->client, 0x8c, &ts->touch_data[12], 4);
if(touches > 3)
gsl_ts_read(ts->client, 0x90, &ts->touch_data[16], 4);
if(touches > 4)
gsl_ts_read(ts->client, 0x94, &ts->touch_data[20], 4);
if(touches > 5)
gsl_ts_read(ts->client, 0x98, &ts->touch_data[24], 4);
if(touches > 6)
gsl_ts_read(ts->client, 0x9c, &ts->touch_data[28], 4);
if(touches > 7)
gsl_ts_read(ts->client, 0xa0, &ts->touch_data[32], 4);
if(touches > 8)
gsl_ts_read(ts->client, 0xa4, &ts->touch_data[36], 4);
if(touches > 9)
gsl_ts_read(ts->client, 0xa8, &ts->touch_data[40], 4);
print_info("-----touches: %d -----\n", touches);
#ifdef GSL_NOID_VERSION
cinfo.finger_num = touches;
print_info("tp-gsl finger_num = %d\n",cinfo.finger_num);
for(i = 0; i dd->x_index + 4 * i + 1] & 0xf),
ts->touch_data[ts->dd->x_index + 4 * i]);
cinfo.y[i] = join_bytes(ts->touch_data[ts->dd->y_index + 4 * i + 1],
ts->touch_data[ts->dd->y_index + 4 * i ]);
cinfo.id[i] = ((ts->touch_data[ts->dd->x_index + 4 * i + 1] & 0xf0)>>4);
print_info("tp-gsl before: x[%d] = %d, y[%d] = %d, id[%d] = %d \n",i,cinfo.x[i],i,cinfo.y[i],i,cinfo.id[i]);
}
cinfo.finger_num=(ts->touch_data[3]8) & 0xff);
buf[2]=(u8)((tmp1>>16) & 0xff);
buf[3]=(u8)((tmp1>>24) & 0xff);
print_info("tmp1=%08x,buf[0]=%02x,buf[1]=%02x,buf[2]=%02x,buf[3]=%02x\n",
tmp1,buf[0],buf[1],buf[2],buf[3]);
gsl_ts_write(ts->client,0x8,buf,4);
}
touches = cinfo.finger_num;
#endif
/*对上报标号和上报状态清零*/
for(i = 1; i touch_data[ts->dd->x_index + 4 * i + 1] & 0xf),
ts->touch_data[ts->dd->x_index + 4 * i]);
y = join_bytes(ts->touch_data[ts->dd->y_index + 4 * i + 1],
ts->touch_data[ts->dd->y_index + 4 * i ]);
id = ts->touch_data[ts->dd->id_index + 4 * i] >> 4;
#endif
if(1 input);
}
if(is_linux > 0)
{
report_data(ts, x_new, y_new, 0, i);
}
id_sign[i]=0;
}
id_state_old_flag[i] = id_state_flag[i];
}
if(0 == touches) //如果是指尖触摸
{
if(REPORT_DATA_ANDROID_4_0 > 0)
input_mt_sync(ts->input);
#ifdef HAVE_TOUCH_KEY
if(key_state_flag)
{
input_report_key(ts->input, key, 0);
input_sync(ts->input);
key_state_flag = 0;
}
#endif
}
input_sync(ts->input); //同步上报时间
schedule:
#ifdef GSL_MONITOR
i2c_lock_flag = 0;
i2c_lock_schedule:
#endif
enable_irq(ts->irq);
}
#ifdef GSL_MONITOR
/*该函数简单解释：一个监听器，一直监听触摸是否有问题，如果出现问题就通过设备初始化进行校准*/
static void gsl_monitor_worker(void)
{
u8 write_buf[4] = {0};
u8 read_buf[4] = {0};
char init_chip_flag = 0;
print_info("----------------gsl_monitor_worker-----------------\n");
if(i2c_lock_flag != 0)
goto queue_monitor_work;
else
i2c_lock_flag = 1;
gsl_ts_read(gsl_client, 0xb0, read_buf, 4);
if(read_buf[3] != 0x5a || read_buf[2] != 0x5a || read_buf[1] != 0x5a || read_buf[0] != 0x5a)
b0_counter ++;
else
b0_counter = 0;
if(b0_counter > 1)
{
printk("======read 0xb0: %x %x %x %x ======\n",read_buf[3], read_buf[2], read_buf[1], read_buf[0]);
init_chip_flag = 1;
b0_counter = 0;
goto queue_monitor_init_chip;
}
gsl_ts_read(gsl_client, 0xb4, read_buf, 4);
int_2nd[3] = int_1st[3];
int_2nd[2] = int_1st[2];
int_2nd[1] = int_1st[1];
int_2nd[0] = int_1st[0];
int_1st[3] = read_buf[3];
int_1st[2] = read_buf[2];
int_1st[1] = read_buf[1];
int_1st[0] = read_buf[0];
if(int_1st[3] == int_2nd[3] && int_1st[2] == int_2nd[2] &&int_1st[1] == int_2nd[1] && int_1st[0] == int_2nd[0])
{
printk("======int_1st: %x %x %x %x , int_2nd: %x %x %x %x ======\n",int_1st[3], int_1st[2], int_1st[1], int_1st[0], int_2nd[3], int_2nd[2],int_2nd[1],int_2nd[0]);
init_chip_flag = 1;
goto queue_monitor_init_chip;
}
#if 1 //version 1.4.0 or later than 1.4.0 read 0xbc for esd checking
gsl_ts_read(gsl_client, 0xbc, read_buf, 4);
if(read_buf[3] != 0 || read_buf[2] != 0 || read_buf[1] != 0 || read_buf[0] != 0)
bc_counter++;
else
bc_counter = 0;
if(bc_counter > 1)
{
printk("======read 0xbc: %x %x %x %x======\n",read_buf[3], read_buf[2], read_buf[1], read_buf[0]);
init_chip_flag = 1;
bc_counter = 0;
}
#else
write_buf[3] = 0x01;
write_buf[2] = 0xfe;
write_buf[1] = 0x10;
write_buf[0] = 0x00;
gsl_ts_write(gsl_client, 0xf0, write_buf, 4);
gsl_ts_read(gsl_client, 0x10, read_buf, 4);
gsl_ts_read(gsl_client, 0x10, read_buf, 4);
if(read_buf[3] wq, &ts->work); //调度任务
}
return IRQ_HANDLED;
}
static int gslX680_ts_init(struct i2c_client *client, struct gsl_ts *ts)
{
struct input_dev *input_device;
int rc = 0;
printk("[GSLX680] Enter %s\n", __func__);
//获取触摸屏结构体gsl_ts_data
ts->dd = &devices[ts->device_id];
//如果这是第一个触摸屏设备
if (ts->device_id == 0) {
ts->dd->data_size = MAX_FINGERS * ts->dd->touch_bytes + ts->dd->touch_meta_data; //获取触摸屏数据的大小
ts->dd->touch_index = 0; //设置该触摸屏的序列号为1
}
/*分配触摸数据空间大小*/
ts->touch_data = kzalloc(ts->dd->data_size, GFP_KERNEL);
if (!ts->touch_data) {
pr_err("%s: Unable to allocate memory\n", __func__);
return -ENOMEM;
}
input_device = input_allocate_device();
if (!input_device) {
rc = -ENOMEM;
goto error_alloc_dev;
}
/*初始化input设备*/
ts->input = input_device;
input_device->name = GSLX680_I2C_NAME;
input_device->id.bustype = BUS_I2C;
input_device->dev.parent = &client->dev;
input_set_drvdata(input_device, ts);
set_bit(EV_ABS, input_device->evbit);
// __set_bit(INPUT_PROP_DIRECT, input_device->propbit);
// input_mt_init_slots(input_device, (MAX_CONTACTS + 1));
if(is_linux > 0)
{
set_bit(BTN_TOUCH, input_device->keybit);
set_bit(EV_ABS, input_device->evbit);//设置触摸屏支持上报绝对位移类型
set_bit(EV_KEY, input_device->evbit);//设置触摸屏支持上报绝对位移类型
//设置触摸屏支持上报绝对位x值
input_set_abs_params(input_device, ABS_X, 0, SCREEN_MAX_X, 0, 0);
//设置触摸屏支持上报绝对位y值
input_set_abs_params(input_device, ABS_Y, 0, SCREEN_MAX_Y, 0, 0);
}
else
{
input_set_abs_params(input_device,ABS_MT_POSITION_X, 0, SCREEN_MAX_X, 0, 0);
input_set_abs_params(input_device,ABS_MT_POSITION_Y, 0, SCREEN_MAX_Y, 0, 0);
input_set_abs_params(input_device,ABS_MT_TOUCH_MAJOR, 0, PRESS_MAX, 0, 0);
input_set_abs_params(input_device, ABS_MT_PRESSURE, 0, 255, 0, 0);
}
#ifdef HAVE_TOUCH_KEY
input_device->evbit[0] = BIT_MASK(EV_KEY); //上报按键类型
//input_device->evbit[0] = BIT_MASK(EV_SYN) | BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
for (i = 0; i keybit);
#endif
// client->irq = IRQ_PORT;
ts->irq = client->irq;
//创建一个工作队列
ts->wq = create_singlethread_workqueue("kworkqueue_ts");
if (!ts->wq) {
dev_err(&client->dev, "Could not create workqueue\n");
goto error_wq_create;
}
//冲洗工作队列，即清理工作队列
flush_workqueue(ts->wq);
//往工作队列增加一个任务，该任务为执行gslX680_ts_worker函数
INIT_WORK(&ts->work, gslX680_ts_worker);
rc = input_register_device(input_device); //注册input设备
if (rc)
goto error_unreg_device;
return 0;
error_unreg_device:
destroy_workqueue(ts->wq);
error_wq_create:
input_free_device(input_device);
error_alloc_dev:
kfree(ts->touch_data);
return rc;
}
static void gs_ts_work_resume(struct work_struct *work)
{
struct gsl_ts *ts = container_of(work, struct gsl_ts,resume_work);
init_chip(ts->client); //芯片初始化
#ifdef GSL_MONITOR
printk( "gsl_ts_resume () : queue gsl_monitor_work\n");
queue_work(gsl_monitor_workqueue, &gsl_monitor_work.work); //调度监听任务
#endif
enable_irq(ts->irq); //使能中断
}
static int gsl_ts_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct gsl_ts *ts;
int rc;
struct device_node *np = client->dev.of_node;
enum of_gpio_flags rst_flags;
unsigned long irq_flags;
int ret = 0;
//printk("GSLX680 Enter %s\n", __func__);
/*检测触摸屏设备*/
if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
dev_err(&client->dev, "I2C functionality not supported\n");
return -ENODEV;
}
/*分配一个struct gsl_ts结构体，为了后续调用函数方便*/
ts = kzalloc(sizeof(*ts), GFP_KERNEL);
if (!ts)
return -ENOMEM;
printk("==kzalloc success=\n");
/*把client嵌入到gsl_ts结构体中*/
ts->client = client;
/*把gsl_ts嵌入到client结构体中*/
i2c_set_clientdata(client, ts);
ts->device_id = 0;
/*从设备树获取触摸中断引脚*/
ts->irq_pin = of_get_named_gpio_flags(np, "touch-gpio", 0, (enum of_gpio_flags *)&irq_flags);
/*从设备树获取复位中断引脚*/
ts->rst_pin = of_get_named_gpio_flags(np, "reset-gpio", 0, &rst_flags);
/*检测复位引脚是否有效，如果有效申请一个GPIO口设定为设备树指定的电平*/
if (gpio_is_valid(ts->rst_pin)) {
ts->rst_val = (rst_flags & OF_GPIO_ACTIVE_LOW) ? 0 : 1;
ret = devm_gpio_request_one(&client->dev, ts->rst_pin, (rst_flags & OF_GPIO_ACTIVE_LOW) ? GPIOF_OUT_INIT_HIGH : GPIOF_OUT_INIT_LOW, "goodix reset pin");
if (ret != 0) {
dev_err(&client->dev, "goodix gpio_request error\n");
return -EIO;
}
gpio_direction_output(ts->rst_pin, 0);
gpio_set_value(ts->rst_pin, 1);
msleep(20);
} else {
dev_info(&client->dev, "reset pin invalid\n");
}
gts = ts;
/*对触摸屏软件进行初始化工作：中断以及input设备*/
rc = gslX680_ts_init(client, ts);
if (rc dev, "GSLX680 init failed\n");
goto error_mutex_destroy;
}
gsl_client = client;
/*复位一次触摸屏*/
gslX680_init();
/*芯片初始化*/
if(init_chip(ts->client) irq=gpio_to_irq(ts->irq_pin);
if (ts->irq)
{
rc= request_irq(ts->irq, gsl_ts_irq, IRQF_TRIGGER_RISING, client->name, ts);
if (rc != 0) {
printk(KERN_ALERT "Cannot allocate ts INT!ERRNO:%d\n", ret);
goto error_req_irq_fail;
}
}
/* create debug attribute */
//rc = device_create_file(&ts->input->dev, &dev_attr_debug_enable);
#ifdef GSL_MONITOR //如果定义了监听
printk( "gsl_ts_probe () : queue gsl_monitor_workqueue\n");
//初始化一个延时监听队列
INIT_DELAYED_WORK(&gsl_monitor_work, gsl_monitor_worker);
//创建一个监听队列
gsl_monitor_workqueue = create_singlethread_workqueue("gsl_monitor_workqueue");
//1000个单位后执行监听函数
queue_delayed_work(gsl_monitor_workqueue, &gsl_monitor_work, 1000);
#endif
device_enable_async_suspend(&client->dev); //
INIT_WORK(&ts->resume_work, gs_ts_work_resume); //
printk("[GSLX680] End %s\n", __func__);
return 0;
//exit_set_irq_mode:
error_req_irq_fail:
free_irq(ts->irq, ts);
error_mutex_destroy:
input_free_device(ts->input);
kfree(ts);
return rc;
}
static int gsl_ts_remove(struct i2c_client *client)
{
struct gsl_ts *ts = i2c_get_clientdata(client);
printk("==gsl_ts_remove=\n");
#ifdef GSL_MONITOR
cancel_delayed_work_sync(&gsl_monitor_work);
destroy_workqueue(gsl_monitor_workqueue);
#endif
device_init_wakeup(&client->dev, 0);
cancel_work_sync(&ts->work);
free_irq(ts->irq, ts);
destroy_workqueue(ts->wq);
input_unregister_device(ts->input);
//device_remove_file(&ts->input->dev, &dev_attr_debug_enable);
kfree(ts->touch_data);
kfree(ts);
gpio_free(gts->rst_pin); //hdc 20150129
return 0;
}
static const struct i2c_device_id gsl_ts_id[] = {
{GSLX680_I2C_NAME, 0},
{}
};
MODULE_DEVICE_TABLE(i2c, gsl_ts_id);
static struct of_device_id goodix_ts_dt_ids[] = {
{ .compatible = "gslX680" },
{ }
};
static struct i2c_driver gsl_ts_driver = {
.driver = {
.name = GSLX680_I2C_NAME,
.owner = THIS_MODULE,
.of_match_table = of_match_ptr(goodix_ts_dt_ids),
},
.probe = gsl_ts_probe,
.remove = gsl_ts_remove,
.id_table = gsl_ts_id,
};
static int __init gsl_ts_init(void)
{
int ret;
if(strcasecmp(root_config, "default") == 0)
{
printk("Initial gslx680 Touch Driver\n");
REPORT_DATA_ANDROID_4_0 = 1;
is_linux = 0;
MAX_FINGERS = 10;
MAX_CONTACTS = 10;
}
else
{
printk("Initial gslx680 linux Touch Driver\n");
REPORT_DATA_ANDROID_4_0 = 0;
is_linux = 1;
MAX_FINGERS = 1;
MAX_CONTACTS = 1;
}
ret = i2c_add_driver(&gsl_ts_driver);
return ret;
}
static void __exit gsl_ts_exit(void)
{
i2c_del_driver(&gsl_ts_driver);
return;
}
module_init(gsl_ts_init);
module_exit(gsl_ts_exit);
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("GSLX680 touchscreen controller driver");
MODULE_AUTHOR("Guan Yuwei, guanyuwei@basewin.com");
MODULE_ALIAS("platform:gsl_ts");
下面是驱动对应的设备树：
gslX680:gslX680@40 {
compatible = "gslX680";
reg = ;
screen_max_x = ;
screen_max_y = ;
touch-gpio = ;
reset-gpio = ;
};
