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android平台的s5pc110触摸屏驱动分析

發(fā)布時(shí)間：2023/12/10 编程问答 30 豆豆

生活随笔收集整理的這篇文章主要介紹了 android平台的s5pc110触摸屏驱动分析小編覺得挺不錯(cuò)的,現(xiàn)在分享給大家,幫大家做個(gè)參考.

內(nèi)核linux2.6.35 andorid2.3 觸摸屏型號(hào)ft5xo6
首先給出該觸摸屏的一些結(jié)構(gòu)體---->drivers/input/touchscreen/ft5x06_ts.h

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#ifndef __LINUX_FT5X0X_TS_H__

#define __LINUX_FT5X0X_TS_H__

#define SCREEN_MIN_X 0

#define SCREEN_MAX_X 320

#define SCREEN_MIN_Y 0

#define SCREEN_MAX_Y 240

#define PRESS_MAX 255

#define MIN_X_CTP 0

#define MAX_X_CTP 896

#define MIN_Y_CTP 0

#define MAX_Y_CTP 640

#define EVENT_PENDOWN 0

#define EVENT_REPEAT 2

#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{

????u16????intr;????????/* irq number????*/

};

#ifndef ABS_MT_TOUCH_MAJOR

#define ABS_MT_TOUCH_MAJOR????0x30????/* touching ellipse */

#define ABS_MT_TOUCH_MINOR????0x31????/* (omit if circular) */

#define ABS_MT_WIDTH_MAJOR????0x32????/* approaching ellipse */

#define ABS_MT_WIDTH_MINOR????0x33????/* (omit if circular) */

#define ABS_MT_ORIENTATION????0x34????/* Ellipse orientation */

#define ABS_MT_POSITION_X????0x35????/* Center X ellipse position */

#define ABS_MT_POSITION_Y????0x36????/* Center Y ellipse position */

#define ABS_MT_TOOL_TYPE????0x37????/* Type of touching device */

#define ABS_MT_BLOB_ID????????0x38????/* Group set of pkts as blob */

#define ABS_MT_TRACKING_ID 0x39 /* Unique ID of initiated contact */

#endif /* ABS_MT_TOUCH_MAJOR */

#endif

還有一些在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 {

????struct input_dev????*input_dev;

????struct ts_event????????event;

????struct work_struct ????pen_event_work;

????struct workqueue_struct *ts_workqueue;

????struct early_suspend????early_suspend;

};

觸摸屏屬于I2C子設(shè)備，按照I2C子系統(tǒng)來寫驅(qū)動(dòng)，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成員（#define I2C_BOARD_INFO(dev_type, dev_addr) \.type = dev_type, .addr = (dev_addr)）

???????.irq = IRQ_EINT(2),//中斷號(hào)

????},

#endif

};

在arch/arm/mach-s5pv210/mach-smdkc110.c中的machine_init()函數(shù)中會(huì)調(diào)用i2c_register_board_info(1, i2c_devs1, ARRAY_SIZE(i2c_devs1));函數(shù)注冊(cè)i2c子設(shè)備
之后，系統(tǒng)會(huì)創(chuàng)建一個(gè)i2c_devinfo結(jié)構(gòu)體，然后將其掛如控制器設(shè)備鏈表中。代碼如下：

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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)

????????__i2c_first_dynamic_bus_num = busnum + 1;

????for (status = 0; len; len--, info++) {//i2c_dev(x)數(shù)組有幾個(gè)成員，就創(chuàng)建幾個(gè)i2c_devinfo結(jié)構(gòu)體

????????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;//掛接在那個(gè)i2c控制器上

????????devinfo->board_info = *info;//type 和addr

????????list_add_tail(&devinfo->list, &__i2c_board_list);//將devinfo添加到控制器的設(shè)備鏈表

????}

????up_write(&__i2c_board_lock);

????return status

當(dāng)i2c控制器驅(qū)動(dòng)加載時(shí)回去掃描這條鏈表，調(diào)用流程為匹配i2c控制器設(shè)備，調(diào)用probe函數(shù)，在probe函數(shù)中調(diào)用i2c_add_numbered_adapter或i2c_add_adapter。在添加adapter時(shí)調(diào)用i2c_register_adapter（）-->
i2c_scan_static_board_info()--->i2c_new_device創(chuàng)建client，注冊(cè)client設(shè)備（device_register）。
觸摸屏設(shè)備驅(qū)動(dòng)
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);//設(shè)備驅(qū)動(dòng)結(jié)構(gòu)體

}

static void __exit ft5x0x_ts_exit(void)

{

????i2c_del_driver(&ft5x0x_ts_driver);

}

ft5x 0x_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_regist er_driver（）分析：

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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)))//調(diào)試用

????????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);//注冊(cè)，匹配成功會(huì)調(diào)用觸摸屏的probe函數(shù)

????if (res)

????????return res;

????pr_debug("i2c-core: driver [%s] registered\n", driver->driver.name);

????INIT_LIST_HEAD(&driver->clients);

????/* Walk the adapters that are already present */

????mutex_lock(&core_lock);

????bus_for_each_dev(&i2c_bus_type, NULL, driver, __process_new_driver);

????mutex_unlock(&core_lock);

????return 0;

}

probe函數(shù)分析

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static int ft5x0x_ts_probe(struct i2c_client *client, const struct i2c_device_id *id)

{

????struct ft5x0x_ts_data *ft5x0x_ts;//在ft5x06_ts.h中定義

????struct input_dev *input_dev;

????int err = 0;

????unsigned char uc_reg_value;

????

????printk("==ft5x0x_ts_probe=\n");

????

????if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {//驗(yàn)證i2c控制器的能力，實(shí)現(xiàn)了那些函數(shù)，這里驗(yàn)證是否實(shí)現(xiàn)了I2C_FUNC_I2C函數(shù)

????????err = -ENODEV;

????????goto exit_check_functionality_failed;

????}

????printk("==kzalloc=\n");

????ft5x0x_ts = kzalloc(sizeof(*ft5x0x_ts), GFP_KERNEL);//分配空間

????if (!ft5x0x_ts)????{

????????err = -ENOMEM;

????????goto exit_alloc_data_failed;

????}

????this_client = client;

????i2c_set_clientdata(client, ft5x0x_ts);//設(shè)置屏相關(guān)的數(shù)據(jù)client->dev->p->driver_data = data;

????INIT_WORK(&ft5x0x_ts->pen_event_work, ft5x0x_ts_pen_irq_work);//初始化工作隊(duì)列

????ft5x0x_ts->ts_workqueue = create_singlethread_workqueue(dev_name(&client->dev));//創(chuàng)建工作線程

????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);//申請(qǐng)中斷

????if (err < 0) {

????????dev_err(&client->dev, "ft5x0x_probe: request irq failed\n");

????????goto exit_irq_request_failed;

????}

????disable_irq(this_client->irq);//關(guān)閉中斷

????input_dev = input_allocate_device();//分配input_dev結(jié)構(gòu)體

????if (!input_dev) {

????????err = -ENOMEM;

????????dev_err(&client->dev, "failed to allocate input device\n");

????????goto exit_input_dev_alloc_failed;

????}

????

????ft5x0x_ts->input_dev = input_dev;

#ifdef CONFIG_FT5X0X_MULTITOUCH//多點(diǎn)觸摸

??????set_bit(EV_ABS, input_dev->evbit);//那類事件

????set_bit(ABS_MT_TOUCH_MAJOR, input_dev->absbit);//設(shè)置adsbit代表那些事件

????set_bit(ABS_MT_POSITION_X, input_dev->absbit);

????set_bit(ABS_MT_POSITION_Y, input_dev->absbit);

????set_bit(ABS_MT_WIDTH_MAJOR, input_dev->absbit);

????input_set_abs_params(input_dev,

???????????? ABS_MT_POSITION_X, 0, SCREEN_MAX_X-1, 0, 0);

????input_set_abs_params(input_dev,

???????????? ABS_MT_POSITION_Y, 0, SCREEN_MAX_Y-1, 0, 0);

????input_set_abs_params(input_dev,

???????????? ABS_MT_TOUCH_MAJOR, 0, PRESS_MAX, 0, 0);

????input_set_abs_params(input_dev,

???????????? ABS_MT_WIDTH_MAJOR, 0, 200, 0, 0);

#else

????set_bit(ABS_X, input_dev->absbit);

????set_bit(ABS_Y, input_dev->absbit);

????set_bit(ABS_PRESSURE, input_dev->absbit);

????set_bit(BTN_TOUCH, input_dev->keybit);

????input_set_abs_params(input_dev, ABS_X, 0, SCREEN_MAX_X, 0, 0);

????input_set_abs_params(input_dev, ABS_Y, 0, SCREEN_MAX_Y, 0, 0);

????input_set_abs_params(input_dev,

???????????? ABS_PRESSURE, 0, PRESS_MAX, 0 , 0);

#endif

????set_bit(EV_SYN, input_dev->evbit);

???????set_bit(BTN_TOUCH, input_dev->keybit);

????set_bit(EV_KEY, input_dev->evbit);

????input_dev->name????????= FT5X0X_NAME;????????//dev_name(&client->dev)//以上是設(shè)置input_dev

????err = input_register_device(input_dev);//注冊(cè)input_dev

????if (err) {

????????dev_err(&client->dev,

????????"ft5x0x_ts_probe: failed to register input device: %s\n",

????????dev_name(&client->dev));

????????goto exit_input_register_device_failed;

????}

????ft5x06_hw_init();//硬件相關(guān)初始化

????msleep(50);

????uc_reg_value = ft5x0x_read_fw_ver();//讀取硬件版本

????printk("[FST] Firmware version = 0x%x\n", uc_reg_value);

????enable_irq(this_client->irq);//使能中斷

????printk("==probe over =\n");

????return 0;

exit_input_register_device_failed://以下是錯(cuò)誤處理

????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);

exit_create_singlethread:

????printk("==singlethread error =\n");

????i2c_set_clientdata(client, NULL);

????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)

????{

????????printk("gpio_request failed for GPIOWake[%d]\n\n",S5PV210_GPG3(2));

????}????

????else if ((gpio_direction_output(S5PV210_GPG3(2),1)) < 0)//將觸摸屏從睡眠模式喚醒

????{

????????printk("gpio_direction_output failed for GPIOWake[%d]\n\n",S5PV210_GPG3(2));

????????gpio_free(S5PV210_GPG3(2));

????}

????

????msleep(5);

????gpio_free(S5PV210_GPG3(2));

}

i2c讀寫函數(shù)

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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,//寫

????????????.len????= 1,//數(shù)據(jù)長度，單位字節(jié)

????????????.buf????= rxdata,是//護(hù)具

????????},

????????{

????????????.addr????= this_client->addr,

????????????.flags????= I2C_M_RD,//讀

????????????.len????= length,//讀的字節(jié)數(shù)

????????????.buf????= rxdata,//存放數(shù)據(jù)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,//寫

????????????.len????= length,//寫的字節(jié)數(shù)

????????????.buf????= txdata,//要寫的數(shù)據(jù)

????????},

????};

????ret = i2c_transfer(this_client->adapter, msg, 1);

????if (ret < 0)

????????pr_err("%s i2c write error: %d\n", __func__, ret);

????return ret;

}

工作隊(duì)列函數(shù)實(shí)現(xiàn)

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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);

}

讀取事件數(shù)據(jù)函數(shù)實(shí)現(xiàn) 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;

}

上報(bào)數(shù)據(jù)

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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);

????????????input_mt_sync(data->input_dev);

????????????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*/

中斷函數(shù)實(shí)現(xiàn)

點(diǎn)擊(此處)折疊或打開

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;

}

要完全貫通的理解整個(gè)原理，還需要input子系統(tǒng)，i2c子系統(tǒng)，工作隊(duì)列機(jī)制，中斷機(jī)制和上層應(yīng)用的結(jié)合。

總結(jié)

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