内核linux2.6.35 andorid2.3 触摸屏型号ft5xo6
首先给出该触摸屏的一些结构体---->drivers/input/touchscreen/ft5x06_ts.h
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#ifndef __LINUX_FT5X0X_TS_H__
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#define __LINUX_FT5X0X_TS_H__
-
-
#define SCREEN_MIN_X 0
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#define SCREEN_MAX_X 320
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#define SCREEN_MIN_Y 0
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#define SCREEN_MAX_Y 240
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#define PRESS_MAX 255
-
-
#define MIN_X_CTP 0
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#define MAX_X_CTP 896
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#define MIN_Y_CTP 0
-
#define MAX_Y_CTP 640
-
-
-
#define EVENT_PENDOWN 0
-
#define EVENT_REPEAT 2
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#define EVENT_PENUP 1
-
-
#define I2C_CTPM_ADDRESS 0x38
-
-
-
#define FT5X0X_NAME "ft5x06-ts"//"synaptics_i2c_rmi"//"synaptics-rmi-ts"//
-
-
struct ft5x0x_ts_platform_data{
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u16 intr; /* irq number */
-
};
-
-
-
-
#ifndef ABS_MT_TOUCH_MAJOR
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#define ABS_MT_TOUCH_MAJOR 0x30 /* touching ellipse */
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#define ABS_MT_TOUCH_MINOR 0x31 /* (omit if circular) */
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#define ABS_MT_WIDTH_MAJOR 0x32 /* approaching ellipse */
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#define ABS_MT_WIDTH_MINOR 0x33 /* (omit if circular) */
-
#define ABS_MT_ORIENTATION 0x34 /* Ellipse orientation */
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#define ABS_MT_POSITION_X 0x35 /* Center X ellipse position */
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#define ABS_MT_POSITION_Y 0x36 /* Center Y ellipse position */
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#define ABS_MT_TOOL_TYPE 0x37 /* Type of touching device */
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#define ABS_MT_BLOB_ID 0x38 /* Group set of pkts as blob */
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#define ABS_MT_TRACKING_ID 0x39 /* Unique ID of initiated contact */
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#endif /* ABS_MT_TOUCH_MAJOR */
-
-
-
#endif
还有一些在ft5x06_ts.c中
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struct ts_event {
-
u16 x1;
-
u16 y1;
-
u16 x2;
-
u16 y2;
-
u16 x3;
-
u16 y3;
-
u16 x4;
-
u16 y4;
-
u16 x5;
-
u16 y5;
-
u16 pressure;
-
u8 touch_point;
-
};
-
-
struct ft5x0x_ts_data {
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struct input_dev *input_dev;
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struct ts_event event;
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struct work_struct pen_event_work;
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struct workqueue_struct *ts_workqueue;
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struct early_suspend early_suspend;
-
};
触摸屏属于I2C子设备,按照I2C子系统来写驱动,首先添加I2C信息。---->arch/arm/mach-s5pv210/smdkc110.c
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static struct i2c_board_info i2c_devs1[] __initdata = {
-
#ifdef CONFIG_VIDEO_TV20
-
{
-
I2C_BOARD_INFO("ft5x06-ts", (0x38)),//初始化i2c_board_info的type和addr成员(#define I2C_BOARD_INFO(dev_type, dev_addr) \.type = dev_type, .addr = (dev_addr))
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.irq = IRQ_EINT(2),//中断号
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},
-
#endif
-
};
在arch/arm/mach-s5pv210/mach-smdkc110.c中的machine_init()函数中会调用i2c_register_board_info(1, i2c_devs1, ARRAY_SIZE(i2c_devs1));函数注册i2c子设备
之后,系统会创建一个i2c_devinfo结构体,然后将其挂如控制器设备链表中。代码如下:
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int __init i2c_register_board_info(int busnum, struct i2c_board_info const *info, unsigned len)
-
{
-
int status;
-
-
down_write(&__i2c_board_lock);
-
-
/* dynamic bus numbers will be assigned after the last static one */
-
if (busnum >= __i2c_first_dynamic_bus_num)
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__i2c_first_dynamic_bus_num = busnum + 1;
-
-
for (status = 0; len; len--, info++) {//i2c_dev(x)数组有几个成员,就创建几个i2c_devinfo结构体
-
struct i2c_devinfo *devinfo;
-
-
devinfo = kzalloc(sizeof(*devinfo), GFP_KERNEL);
-
if (!devinfo) {
-
pr_debug("i2c-core: can't register boardinfo!\n");
-
status = -ENOMEM;
-
break;
-
}
-
-
devinfo->busnum = busnum;//挂接在那个i2c控制器上
-
devinfo->board_info = *info;//type 和addr
-
list_add_tail(&devinfo->list, &__i2c_board_list);//将devinfo添加到控制器的设备链表
-
}
-
-
up_write(&__i2c_board_lock);
-
-
return status
当i2c控制器驱动加载时回去扫描这条链表,调用流程为匹配i2c控制器设备,调用probe函数,在probe函数中调用i2c_add_numbered_adapter或i2c_add_adapter。在添加adapter时调用i2c_register_adapter()-->
i2c_scan_static_board_info()--->i2c_new_device创建client,注册client设备(device_register)。
触摸屏设备驱动
drivers/input/touchscreen/ft5x06_ts.c
首先:
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static int __init ft5x0x_ts_init(void)
-
{
-
return i2c_add_driver(&ft5x0x_ts_driver);//设备驱动结构体
-
}
-
-
static void __exit ft5x0x_ts_exit(void)
-
{
-
i2c_del_driver(&ft5x0x_ts_driver);
-
}
ft5x0x_ts_driver如下:
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static const struct i2c_device_id ft5x0x_ts_id[] = {
-
{ FT5X0X_NAME, 0 },{ }
-
};
-
-
MODULE_DEVICE_TABLE(i2c, ft5x0x_ts_id);
-
-
static struct i2c_driver ft5x0x_ts_driver = {
-
.driver = {
-
.name = FT5X0X_NAME,
-
},
-
.probe = ft5x0x_ts_probe,
-
.remove = ft5x0x_ts_remove,
-
.id_table = ft5x0x_ts_id,//id_table如上
-
-
-
};
i2c_add_driver()分析
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static inline int i2c_add_driver(struct i2c_driver *driver)
-
{
-
return i2c_register_driver(THIS_MODULE, driver);
-
}
i2c_register_driver()分析:
-
int i2c_register_driver(struct module *owner, struct i2c_driver *driver)
-
{
-
int res;
-
-
/* Can't register until after driver model init */
-
if (unlikely(WARN_ON(!i2c_bus_type.p)))//调试用
-
return -EAGAIN;
-
-
/* add the driver to the list of i2c drivers in the driver core */
-
driver->driver.owner = owner;
-
driver->driver.bus = &i2c_bus_type;
-
-
/* When registration returns, the driver core
-
* will have called probe() for all matching-but-unbound devices.
-
*/
-
res = driver_register(&driver->driver);//注册,匹配成功会调用触摸屏的probe函数
-
if (res)
-
return res;
-
-
pr_debug("i2c-core: driver [%s] registered\n", driver->driver.name);
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-
INIT_LIST_HEAD(&driver->clients);
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/* Walk the adapters that are already present */
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mutex_lock(&core_lock);
-
bus_for_each_dev(&i2c_bus_type, NULL, driver, __process_new_driver);
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mutex_unlock(&core_lock);
-
-
return 0;
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}
probe函数分析
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static int ft5x0x_ts_probe(struct i2c_client *client, const struct i2c_device_id *id)
-
{
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struct ft5x0x_ts_data *ft5x0x_ts;//在ft5x06_ts.h中定义
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struct input_dev *input_dev;
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int err = 0;
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unsigned char uc_reg_value;
-
-
printk("==ft5x0x_ts_probe=\n");
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-
if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {//验证i2c控制器的能力,实现了那些函数,这里验证是否实现了I2C_FUNC_I2C函数
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err = -ENODEV;
-
goto exit_check_functionality_failed;
-
}
-
-
printk("==kzalloc=\n");
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ft5x0x_ts = kzalloc(sizeof(*ft5x0x_ts), GFP_KERNEL);//分配空间
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if (!ft5x0x_ts) {
-
err = -ENOMEM;
-
goto exit_alloc_data_failed;
-
}
-
-
-
this_client = client;
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i2c_set_clientdata(client, ft5x0x_ts);//设置屏相关的数据client->dev->p->driver_data = data;
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-
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INIT_WORK(&ft5x0x_ts->pen_event_work, ft5x0x_ts_pen_irq_work);//初始化工作队列
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-
ft5x0x_ts->ts_workqueue = create_singlethread_workqueue(dev_name(&client->dev));//创建工作线程
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if (!ft5x0x_ts->ts_workqueue) {
-
err = -ESRCH;
-
goto exit_create_singlethread;
-
}
-
-
err = request_irq(client->irq, ft5x0x_ts_interrupt, IRQF_TRIGGER_FALLING, "ft5x06_ts", ft5x0x_ts);//申请中断
-
if (err < 0) {
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dev_err(&client->dev, "ft5x0x_probe: request irq failed\n");
-
goto exit_irq_request_failed;
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}
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-
disable_irq(this_client->irq);//关闭中断
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-
input_dev = input_allocate_device();//分配input_dev结构体
-
if (!input_dev) {
-
err = -ENOMEM;
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dev_err(&client->dev, "failed to allocate input device\n");
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goto exit_input_dev_alloc_failed;
-
}
-
-
ft5x0x_ts->input_dev = input_dev;
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-
#ifdef CONFIG_FT5X0X_MULTITOUCH//多点触摸
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set_bit(EV_ABS, input_dev->evbit);//那类事件
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set_bit(ABS_MT_TOUCH_MAJOR, input_dev->absbit);//设置adsbit代表那些事件
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set_bit(ABS_MT_POSITION_X, input_dev->absbit);
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set_bit(ABS_MT_POSITION_Y, input_dev->absbit);
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set_bit(ABS_MT_WIDTH_MAJOR, input_dev->absbit);
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-
input_set_abs_params(input_dev,
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ABS_MT_POSITION_X, 0, SCREEN_MAX_X-1, 0, 0);
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input_set_abs_params(input_dev,
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ABS_MT_POSITION_Y, 0, SCREEN_MAX_Y-1, 0, 0);
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input_set_abs_params(input_dev,
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ABS_MT_TOUCH_MAJOR, 0, PRESS_MAX, 0, 0);
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input_set_abs_params(input_dev,
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ABS_MT_WIDTH_MAJOR, 0, 200, 0, 0);
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#else
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set_bit(ABS_X, input_dev->absbit);
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set_bit(ABS_Y, input_dev->absbit);
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set_bit(ABS_PRESSURE, input_dev->absbit);
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set_bit(BTN_TOUCH, input_dev->keybit);
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input_set_abs_params(input_dev, ABS_X, 0, SCREEN_MAX_X, 0, 0);
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input_set_abs_params(input_dev, ABS_Y, 0, SCREEN_MAX_Y, 0, 0);
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input_set_abs_params(input_dev,
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ABS_PRESSURE, 0, PRESS_MAX, 0 , 0);
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#endif
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-
set_bit(EV_SYN, input_dev->evbit);
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set_bit(BTN_TOUCH, input_dev->keybit);
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set_bit(EV_KEY, input_dev->evbit);
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input_dev->name = FT5X0X_NAME; //dev_name(&client->dev)//以上是设置input_dev
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err = input_register_device(input_dev);//注册input_dev
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if (err) {
-
dev_err(&client->dev,
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"ft5x0x_ts_probe: failed to register input device: %s\n",
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dev_name(&client->dev));
-
goto exit_input_register_device_failed;
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}
-
-
ft5x06_hw_init();//硬件相关初始化
-
-
msleep(50);
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-
uc_reg_value = ft5x0x_read_fw_ver();//读取硬件版本
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printk("[FST] Firmware version = 0x%x\n", uc_reg_value);
-
-
enable_irq(this_client->irq);//使能中断
-
-
printk("==probe over =\n");
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return 0;
-
-
exit_input_register_device_failed://以下是错误处理
-
input_free_device(input_dev);
-
exit_input_dev_alloc_failed:
-
free_irq(client->irq, ft5x0x_ts);
-
exit_irq_request_failed:
-
cancel_work_sync(&ft5x0x_ts->pen_event_work);
-
destroy_workqueue(ft5x0x_ts->ts_workqueue);
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exit_create_singlethread:
-
printk("==singlethread error =\n");
-
i2c_set_clientdata(client, NULL);
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kfree(ft5x0x_ts);
-
exit_alloc_data_failed:
-
exit_check_functionality_failed:
-
return err;
-
}
ft5x06_hw_init();分析
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static void ft5x06_hw_init(void)
-
{
-
if ((gpio_request(S5PV210_GPG3(2), "ft5406 wake-up"))< 0)
-
{
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printk("gpio_request failed for GPIOWake[%d]\n\n",S5PV210_GPG3(2));
-
}
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else if ((gpio_direction_output(S5PV210_GPG3(2),1)) < 0)//将触摸屏从睡眠模式唤醒
-
{
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printk("gpio_direction_output failed for GPIOWake[%d]\n\n",S5PV210_GPG3(2));
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gpio_free(S5PV210_GPG3(2));
-
}
-
-
msleep(5);
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gpio_free(S5PV210_GPG3(2));
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}
i2c读写函数
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static int ft5x0x_i2c_rxdata(char *rxdata, int length)
-
{
-
int ret;
-
-
struct i2c_msg msgs[] = {
-
{
-
.addr = this_client->addr,
-
.flags = 0,//写
-
.len = 1,//数据长度,单位字节
-
.buf = rxdata,是//护具
-
},
-
{
-
.addr = this_client->addr,
-
.flags = I2C_M_RD,//读
-
.len = length,//读的字节数
-
.buf = rxdata,//存放数据的位置
-
},
-
};
-
-
ret = i2c_transfer(this_client->adapter, msgs, 2);
-
if (ret < 0)
-
pr_err("msg %s i2c read error: %d\n", __func__, ret);
-
-
return ret;
-
}
-
-
static int ft5x0x_i2c_txdata(char *txdata, int length)
-
{
-
int ret;
-
-
struct i2c_msg msg[] = {
-
{
-
.addr = this_client->addr,
-
.flags = 0,//写
-
.len = length,//写的字节数
-
.buf = txdata,//要写的数据
-
},
-
};
-
-
ret = i2c_transfer(this_client->adapter, msg, 1);
-
if (ret < 0)
-
pr_err("%s i2c write error: %d\n", __func__, ret);
-
-
return ret;
-
}
工作队列函数实现
-
static void ft5x0x_ts_pen_irq_work(struct work_struct *work)
-
{
-
int ret = -1;
-
-
ret = ft5x0x_read_data();
-
if (ret == 0) {
-
ft5x0x_report_value();
-
}
-
-
enable_irq(this_client->irq);
-
}
读取事件数据函数实现ft5x0x_read_data
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static int ft5x0x_read_data(void)
-
{
-
struct ft5x0x_ts_data *data = i2c_get_clientdata(this_client);
-
struct ts_event *event = &data->event;
-
-
u8 buf[26] = {0};
-
unsigned long x_tmp[5]={0},y_tmp[5]={0};
-
-
int ret = -1;
-
-
buf[0]=0xf9;
-
ret = ft5x0x_i2c_rxdata(buf, 26);
-
-
if (ret < 0) {
-
printk("%s read_data i2c_rxdata failed: %d\n", __func__, ret);
-
return ret;
-
}
-
memset(event, 0, sizeof(struct ts_event));
-
-
event->touch_point = buf[3] & 0x07;// 000 0111
-
-
if (event->touch_point == 0) {
-
ft5x0x_ts_release();
-
return 1;
-
}
-
-
-
switch (event->touch_point) {
-
case 5:
-
-
x_tmp[4] = (((buf[21] & 0x0f) << 8 | buf[22]))*SCREEN_MAX_X;
-
do_div(x_tmp[4],MAX_X_CTP);
-
event->x5= (s16)x_tmp[4];
-
-
y_tmp[4] = (((buf[23] & 0x0f) << 8 | buf[24]))*SCREEN_MAX_Y;
-
do_div(y_tmp[4],MAX_Y_CTP);
-
event->y5 =(s16)y_tmp[4];
-
-
-
case 4:
-
x_tmp[3] = (((buf[17] & 0x0f) << 8 | buf[18]))*SCREEN_MAX_X;
-
do_div(x_tmp[3],MAX_X_CTP);
-
event->x4 = (s16)x_tmp[3];
-
-
y_tmp[3] = (((buf[19] & 0x0f) << 8 | buf[20]))*SCREEN_MAX_Y;
-
do_div(y_tmp[3],MAX_Y_CTP);
-
event->y4 =(s16)y_tmp[3];
-
-
case 3:
-
x_tmp[2] = (((buf[13] & 0x0f) << 8 | buf[14]))*SCREEN_MAX_X;
-
do_div(x_tmp[2],MAX_X_CTP);
-
event->x3 = (s16)x_tmp[2];
-
-
y_tmp[2] = (((buf[15] & 0x0f) << 8 | buf[16]))*SCREEN_MAX_Y;
-
do_div(y_tmp[2],MAX_Y_CTP);
-
event->y3 =(s16)y_tmp[2];
-
-
case 2:
-
x_tmp[1] = (((buf[9] & 0x0f) << 8 | buf[10]))*SCREEN_MAX_X;
-
do_div(x_tmp[1],MAX_X_CTP);
-
event->x2 = (s16)x_tmp[1];
-
-
y_tmp[1] = (((buf[11] & 0x0f) << 8 | buf[12]))*SCREEN_MAX_Y;
-
do_div(y_tmp[1],MAX_Y_CTP);
-
event->y2 =(s16)y_tmp[1];
-
-
case 1:
-
x_tmp[0] = (((buf[5] & 0x0f) << 8 | buf[6]))*SCREEN_MAX_X;
-
do_div(x_tmp[0],MAX_X_CTP);
-
event->x1 = (s16)x_tmp[0];
-
-
y_tmp[0] = (((buf[7] & 0x0f) << 8 | buf[8]))*SCREEN_MAX_Y;
-
do_div(y_tmp[0],MAX_Y_CTP);
-
event->y1 =(s16)y_tmp[0];
-
break;
-
default:
-
return -1;
-
}
-
event->pressure = 200;
-
-
dev_dbg(&this_client->dev, "%s: 1:%d %d 2:%d %d \n", __func__,
-
event->x1, event->y1, event->x2, event->y2);
-
-
return 0;
-
}
上报数据
-
static void ft5x0x_report_value(void)
-
{
-
struct ft5x0x_ts_data *data = i2c_get_clientdata(this_client);
-
struct ts_event *event = &data->event;
-
-
switch(event->touch_point) {
-
case 5:
-
input_report_abs(data->input_dev, ABS_MT_TOUCH_MAJOR, event->pressure);
-
input_report_abs(data->input_dev, ABS_MT_POSITION_X, event->x5);
-
input_report_abs(data->input_dev, ABS_MT_POSITION_Y, event->y5);
-
input_report_abs(data->input_dev, ABS_MT_WIDTH_MAJOR, 1);
-
input_report_key(data->input_dev, BTN_TOUCH, 1);
-
input_mt_sync(data->input_dev);
-
printk("===x2 = %d,y2 = %d ====\n",event->x2,event->y2);
-
case 4:
-
input_report_abs(data->input_dev, ABS_MT_TOUCH_MAJOR, event->pressure);
-
input_report_abs(data->input_dev, ABS_MT_POSITION_X, event->x4);
-
input_report_abs(data->input_dev, ABS_MT_POSITION_Y, event->y4);
-
input_report_abs(data->input_dev, ABS_MT_WIDTH_MAJOR, 1);
-
input_report_key(data->input_dev, BTN_TOUCH, 1);
-
input_mt_sync(data->input_dev);
-
printk("===x2 = %d,y2 = %d ====\n",event->x2,event->y2);
-
case 3:
-
input_report_abs(data->input_dev, ABS_MT_TOUCH_MAJOR, event->pressure);
-
input_report_abs(data->input_dev, ABS_MT_POSITION_X, event->x3);
-
input_report_abs(data->input_dev, ABS_MT_POSITION_Y, event->y3);
-
input_report_abs(data->input_dev, ABS_MT_WIDTH_MAJOR, 1);
-
input_report_key(data->input_dev, BTN_TOUCH, 1);
-
input_mt_sync(data->input_dev);
-
printk("===x2 = %d,y2 = %d ====\n",event->x2,event->y2);
-
case 2:
-
input_report_abs(data->input_dev, ABS_MT_TOUCH_MAJOR, event->pressure);
-
input_report_abs(data->input_dev, ABS_MT_POSITION_X, event->x2);
-
input_report_abs(data->input_dev, ABS_MT_POSITION_Y, event->y2);
-
input_report_abs(data->input_dev, ABS_MT_WIDTH_MAJOR, 1);
-
input_report_key(data->input_dev, BTN_TOUCH, 1);
-
input_mt_sync(data->input_dev);
-
printk("===x2 = %d,y2 = %d ====\n",event->x2,event->y2);
-
case 1:
-
input_report_abs(data->input_dev, ABS_MT_TOUCH_MAJOR, event->pressure);
-
input_report_abs(data->input_dev, ABS_MT_POSITION_X, event->x1);
-
input_report_abs(data->input_dev, ABS_MT_POSITION_Y, event->y1);
-
input_report_abs(data->input_dev, ABS_MT_WIDTH_MAJOR, 1);
-
input_report_key(data->input_dev, BTN_TOUCH, 1);
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input_mt_sync(data->input_dev);
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printk("===x1 = %d,y1 = %d ====\n",event->x1,event->y1);
-
-
break;
-
-
default:
-
printk("==touch_point default =\n");
-
break;
-
}
-
input_sync(data->input_dev);
-
-
dev_dbg(&this_client->dev, "%s: 1:%d %d 2:%d %d \n", __func__,
-
event->x1, event->y1, event->x2, event->y2);
-
} /*end ft5x0x_report_value*/
中断函数实现
-
static irqreturn_t ft5x0x_ts_interrupt(int irq, void *dev_id)
-
{
-
struct ft5x0x_ts_data *ft5x0x_ts = dev_id;
-
-
disable_irq_nosync(this_client->irq);
-
-
if (!work_pending(&ft5x0x_ts->pen_event_work)) {
-
queue_work(ft5x0x_ts->ts_workqueue, &ft5x0x_ts->pen_event_work);
-
}
-
-
return IRQ_HANDLED;
-
}
要完全贯通的理解整个原理,还需要input子系统,i2c子系统,工作队列机制,中断机制和上层应用的结合。
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