(1)添加一款TOUCHPANEL
在projectConfig.mk文件里面修改如下：
CUSTOM_KERNEL_TOUCHPANEL = cy8ctma300
在mediatek\custom\common\kernel\touchpanel文件夾添加文件夾如下：
mediatek\custom\common\kernel\touchpanel\cy8ctma300.c
(2)源碼分析
1）我們知道linux內(nèi)核，添加驅動的初始化函數(shù)，大都是通過宏module_init；添加退出函數(shù)大都通過宏module_exit，具體這兩個宏的作用，我這里就不細說了。例如：
module_init(tpd_driver_init);
module_exit(tpd_driver_exit);
2）下面分析這個初始化函數(shù)和退出函數(shù)
/* called when loaded into kernel */
static int __init tpd_driver_init(void)
{
?? ??? ?if(tpd_driver_add(&tpd_device_driver) < 0)
?? ??? ??? ?TPD_DMESG("add generic driver failed\n");
??? return 0;
}

/* should never be called */
static void __exit tpd_driver_exit(void)
{
??? tpd_driver_remove(&tpd_device_driver);
}
可以看出分別是添加和移除tpd 驅動
3）再接著分析 tpd_driver_init和 tpd_driver_exit
int tpd_driver_add(struct tpd_driver_t *tpd_drv)
{
?? ?int i;
?? ?
?? ?if(g_tpd_drv != NULL)
?? ?{
?? ??? ?TPD_DMESG("touch driver exist \n");
?? ??? ?return -1;
?? ?}
?? ?/* check parameter */
?? ?if(tpd_drv == NULL)
?? ?{
?? ??? ?return -1;
?? ?}
?? ?/* R-touch */
?? ?if(strcmp(tpd_drv->tpd_device_name, "generic") == 0)
?? ?{
?? ??? ??? ?tpd_driver_list[0].tpd_device_name = tpd_drv->tpd_device_name;
?? ??? ??? ?tpd_driver_list[0].tpd_local_init = tpd_drv->tpd_local_init;
?? ??? ??? ?tpd_driver_list[0].suspend = tpd_drv->suspend;
?? ??? ??? ?tpd_driver_list[0].resume = tpd_drv->resume;
?? ??? ??? ?tpd_driver_list[0].tpd_have_button = tpd_drv->tpd_have_button;
?? ??? ??? ?return 0;
?? ?}
?? ?for(i = 1; i < TP_DRV_MAX_COUNT; i++)
?? ?{
?? ??? ?/* add tpd driver into list */
?? ??? ?if(tpd_driver_list[i].tpd_device_name == NULL)
?? ??? ?{
?? ??? ??? ?tpd_driver_list[i].tpd_device_name = tpd_drv->tpd_device_name;
?? ??? ??? ?tpd_driver_list[i].tpd_local_init = tpd_drv->tpd_local_init;
?? ??? ??? ?tpd_driver_list[i].suspend = tpd_drv->suspend;
?? ??? ??? ?tpd_driver_list[i].resume = tpd_drv->resume;
?? ??? ??? ?tpd_driver_list[i].tpd_have_button = tpd_drv->tpd_have_button;
?? ??? ??? ?#if 0
?? ??? ??? ?if(tpd_drv->tpd_local_init()==0)
?? ??? ??? ?{
?? ??? ??? ??? ?TPD_DMESG("load %s sucessfully\n", tpd_driver_list[i].tpd_device_name);
?? ??? ??? ??? ?g_tpd_drv = &tpd_driver_list[i];
?? ??? ??? ?}
?? ??? ??? ?#endif
?? ??? ??? ?break;
?? ??? ?}
?? ??? ?if(strcmp(tpd_driver_list[i].tpd_device_name, tpd_drv->tpd_device_name) == 0)
?? ??? ?{
?? ??? ??? ?return 1; // driver exist
?? ??? ?}
?? ?}
?? ?
?? ?return 0;
}

int tpd_driver_remove(struct tpd_driver_t *tpd_drv)
{
?? ?int i = 0;
?? ?/* check parameter */
?? ?if(tpd_drv == NULL)
?? ?{
?? ??? ?return -1;
?? ?}
?? ?for(i = 0; i < TP_DRV_MAX_COUNT; i++)
?? ?{
?? ??? ?/* find it */
?? ??? ?if (strcmp(tpd_driver_list[i].tpd_device_name, tpd_drv->tpd_device_name) == 0)
?? ??? ?{
?? ??? ??? ?memset(&tpd_driver_list[i], 0, sizeof(struct tpd_driver_t));
?? ??? ??? ?break;
?? ??? ?}
?? ?}
?? ?return 0;
}
可以看出主要是把當前的驅動從數(shù)組tpd_driver_list 加進或者移出，這里我們發(fā)現(xiàn)一個重點的結構體
struct tpd_driver_t
{
?? ??? ?char *tpd_device_name;
?? ??? ?int (*tpd_local_init)(void);
??? ??? ?void (*suspend)(struct early_suspend *h);
??? ??? ?void (*resume)(struct early_suspend *h);
??? ??? ?int tpd_have_button;
};
下面我們接著分析如何初始化這個結構體
static struct tpd_driver_t tpd_device_driver = {
?? ??? ?.tpd_device_name = "cy8ctma300",
?? ??? ?.tpd_local_init = tpd_local_init,
?? ??? ?.suspend = tpd_suspend,
?? ??? ?.resume = tpd_resume,
#ifdef TPD_HAVE_BUTTON
?? ??? ?.tpd_have_button = 1,
#else
?? ??? ?.tpd_have_button = 0,
#endif
4）接下來就看上面三個函數(shù)是如何實現(xiàn)的
int tpd_local_init(void)
{
?? ?if(tpd_em_debuglog==1) {
?? ??? ?TPD_DMESG("[mtk-tpd] %s\n", __FUNCTION__);
?? ?}
???? if(i2c_add_driver(&tpd_i2c_driver)!=0) {
????? TPD_DMESG("unable to add i2c driver.\n");
????? return -1;
??? }
??? if(tpd_load_status == 0)
??? {
?? ??? ?TPD_DMESG("add error touch panel driver.\n");
?? ??? ?i2c_del_driver(&tpd_i2c_driver);
?? ??? ?return -1;
??? }
#ifdef TPD_HAVE_BUTTON??? ?
??? tpd_button_setting(TPD_KEY_COUNT, tpd_keys_local, tpd_keys_dim_local);// initialize tpd button data
#endif? ?
?
#if (defined(TPD_WARP_START) && defined(TPD_WARP_END))?? ?
??? TPD_DO_WARP = 1;
??? memcpy(tpd_wb_start, tpd_wb_start_local, TPD_WARP_CNT*4);
??? memcpy(tpd_wb_end, tpd_wb_start_local, TPD_WARP_CNT*4);
#endif

#if (defined(TPD_HAVE_CALIBRATION) && !defined(TPD_CUSTOM_CALIBRATION))
??? memcpy(tpd_calmat, tpd_calmat_local, 8*4);
??? memcpy(tpd_def_calmat, tpd_def_calmat_local, 8*4);?? ?
#endif ?
?? ??? ?TPD_DMESG("end %s, %d\n", __FUNCTION__, __LINE__); ?
?? ??? ?tpd_type_cap = 1;
??? return 0;
}
這里面核心的就是 i2c_add_driver，添加一個I2C設備
/* Function to manage low power suspend */
void tpd_suspend(struct early_suspend *h)
{
?? ?if(tpd_em_debuglog==1) {
?? ??? ?TPD_DMESG("[mtk-tpd] %s\n", __FUNCTION__);
?? ?}
? ?? ?tpd_halt = 1;?? ?
?? ?while(1){
?? ??? ?if(tpd_flag == 1) msleep(1000);
?? ??? ?else break;?? ?
?? ?}
??? mt65xx_eint_mask(CUST_EINT_TOUCH_PANEL_NUM);

??? #ifdef TPD_HAVE_POWER_ON_OFF
??? mt_set_gpio_mode(GPIO_CTP_EN_PIN, GPIO_CTP_EN_PIN_M_GPIO);
??? mt_set_gpio_dir(GPIO_CTP_EN_PIN, GPIO_DIR_OUT);
??? mt_set_gpio_out(GPIO_CTP_EN_PIN, GPIO_OUT_ZERO);
??? //msleep(1);
??? mdelay(1);
??? mt_set_gpio_mode(GPIO_CTP_RST_PIN, GPIO_CTP_RST_PIN_M_GPIO);
??? mt_set_gpio_dir(GPIO_CTP_RST_PIN, GPIO_DIR_OUT);
??? mt_set_gpio_out(GPIO_CTP_RST_PIN, GPIO_OUT_ZERO);?? ?
??? #endif
}
通過GPIO，掛起，使TPD不起作用
/* Function to manage power-on resume */
void tpd_resume(struct early_suspend *h)
{
?? ?if(tpd_em_debuglog==1) {
?? ??? ?TPD_DMESG("[mtk-tpd] %s\n", __FUNCTION__);
?? ?}
??? #ifdef TPD_HAVE_POWER_ON_OFF
?? // msleep(100);
??? mt_set_gpio_mode(GPIO_CTP_EN_PIN, GPIO_CTP_EN_PIN_M_GPIO);
??? mt_set_gpio_dir(GPIO_CTP_EN_PIN, GPIO_DIR_OUT);
??? mt_set_gpio_out(GPIO_CTP_EN_PIN, GPIO_OUT_ONE);
??? msleep(1);
??? mt_set_gpio_out(GPIO_CTP_RST_PIN, GPIO_OUT_ZERO);
??? msleep(1);
??? mt_set_gpio_out(GPIO_CTP_RST_PIN, GPIO_OUT_ONE);?? ?
??? msleep(100);
??? #endif

??? mt65xx_eint_unmask(CUST_EINT_TOUCH_PANEL_NUM);
??? tpd_halt = 0;
}
通過GPIO，恢復，使TPD起作用
5）下面看看I2C設備是如何被初始化的
struct i2c_driver tpd_i2c_driver = {????????????????????? ?
??? .probe = tpd_i2c_probe,????????????????????????????????? ?
??? .remove = tpd_i2c_remove,????????????????????????? ?
??? .detect = tpd_i2c_detect,????????????????????????? ?
??? .driver.name = "mtk-tpd",
??? .id_table = tpd_i2c_id,??????????????????????????? ?
??? .address_data = &addr_data,?????????????????????? ?
};
6）下面下面接著分析三個I2C函數(shù)
static int tpd_i2c_detect(struct i2c_client *client, int kind, struct i2c_board_info *info) {
??? strcpy(info->type, "mtk-tpd");
??? return 0;
}
static int tpd_i2c_remove(struct i2c_client *client) {return 0;}

static int tpd_i2c_probe(struct i2c_client *client, const struct i2c_device_id *id) {??????????? ?
??? int err = 0;
??? char buffer[2];
??? int status=0;
??? i2c_client = client;?? ?
?? ?
??? #ifdef TPD_NO_GPIO
??? u16 temp;
??? temp = *(volatile u16 *) TPD_RESET_PIN_ADDR;
??? temp = temp | 0x40;
??? *(volatile u16 *) TPD_RESET_PIN_ADDR = temp;
??? #endif
?? ?
??? #ifndef TPD_NO_GPIO
??? mt_set_gpio_mode(GPIO_CTP_RST_PIN, GPIO_CTP_RST_PIN_M_GPIO);
??? mt_set_gpio_dir(GPIO_CTP_RST_PIN, GPIO_DIR_OUT);
??? mt_set_gpio_out(GPIO_CTP_RST_PIN, GPIO_OUT_ZERO); ?
??? msleep(10); ?
??? mt_set_gpio_mode(GPIO_CTP_EN_PIN, GPIO_CTP_EN_PIN_M_GPIO);
??? mt_set_gpio_dir(GPIO_CTP_EN_PIN, GPIO_DIR_OUT);
??? mt_set_gpio_out(GPIO_CTP_EN_PIN, GPIO_OUT_ONE);
?? ?
?//?? mt_set_gpio_mode(GPIO_CTP_RST_PIN, GPIO_CTP_RST_PIN_M_GPIO);
?//?? mt_set_gpio_dir(GPIO_CTP_RST_PIN, GPIO_DIR_OUT);
?//?? mt_set_gpio_out(GPIO_CTP_RST_PIN, GPIO_OUT_ONE);
?//?? msleep(10);
??? mt_set_gpio_out(GPIO_CTP_RST_PIN, GPIO_OUT_ZERO);
??? msleep(1);
??? mt_set_gpio_out(GPIO_CTP_RST_PIN, GPIO_OUT_ONE);
?? ?
??? mt_set_gpio_mode(GPIO_CTP_EINT_PIN, GPIO_CTP_EINT_PIN_M_EINT);
??? mt_set_gpio_dir(GPIO_CTP_EINT_PIN, GPIO_DIR_IN);
??? mt_set_gpio_pull_enable(GPIO_CTP_EINT_PIN, GPIO_PULL_ENABLE);
??? mt_set_gpio_pull_select(GPIO_CTP_EINT_PIN, GPIO_PULL_UP);
??? #endif

??? msleep(50);
??? status = i2c_smbus_read_i2c_block_data(i2c_client, 0x00, 1, &(buffer[0]));
??? if(status<0)
??? {
?? ??? ??? ?TPD_DMESG("[mtk-tpd], cy8ctma300 tpd_i2c_probe failed!!\n");
?? ??? ??? ?status = i2c_smbus_read_i2c_block_data(i2c_client, 0x00, 1, &(buffer[0]));
?? ??? ??? ?if(status<0) {
?? ??? ??? ??? ?TPD_DMESG("[mtk-tpd], cy8ctma300 tpd_i2c_probe retry failed!!\n");
?? ??? ??? ??? ?return status;
?? ??? ??? ?}
??? }

?? ??? ?TPD_DMESG("[mtk-tpd], cy8ctma300 tpd_i2c_probe success!!\n");?? ??? ?
?? ??? ?tpd_load_status = 1;
?????? ?
??? if ((buffer[0] & 0x70) != 0x00) {
??????? buffer[0] = 0x00; // switch to operation mode
??????? i2c_smbus_write_i2c_block_data(i2c_client, 0x00, 1, &(buffer[0]));
??????? msleep(50);
??? }

??? thread = kthread_run(touch_event_handler, 0, TPD_DEVICE);
??? if (IS_ERR(thread)) {
??????? err = PTR_ERR(thread);
??????? TPD_DMESG(TPD_DEVICE " failed to create kernel thread: %d\n", err);
??? }
?? ?
??? mt65xx_eint_set_sens(CUST_EINT_TOUCH_PANEL_NUM, CUST_EINT_TOUCH_PANEL_SENSITIVE);
??? mt65xx_eint_set_hw_debounce(CUST_EINT_TOUCH_PANEL_NUM, CUST_EINT_TOUCH_PANEL_DEBOUNCE_CN);
??? mt65xx_eint_registration(CUST_EINT_TOUCH_PANEL_NUM, CUST_EINT_TOUCH_PANEL_DEBOUNCE_EN, CUST_EINT_TOUCH_PANEL_POLARITY, tpd_eint_interrupt_handler, 1);
??? mt65xx_eint_unmask(CUST_EINT_TOUCH_PANEL_NUM);
?? ?
??? return 0;
}
7）我們發(fā)現(xiàn)這個函數(shù)是主要函數(shù)
主要實現(xiàn)了配置TPD中斷的GPIO口，I2C讀寫數(shù)據(jù)，設置中斷相關函數(shù)，如下
??? mt65xx_eint_set_sens(CUST_EINT_TOUCH_PANEL_NUM, CUST_EINT_TOUCH_PANEL_SENSITIVE);
??? mt65xx_eint_set_hw_debounce(CUST_EINT_TOUCH_PANEL_NUM, CUST_EINT_TOUCH_PANEL_DEBOUNCE_CN);
??? mt65xx_eint_registration(CUST_EINT_TOUCH_PANEL_NUM, CUST_EINT_TOUCH_PANEL_DEBOUNCE_EN, CUST_EINT_TOUCH_PANEL_POLARITY, tpd_eint_interrupt_handler, 1);
??? mt65xx_eint_unmask(CUST_EINT_TOUCH_PANEL_NUM);
還有個關鍵函數(shù)
touch_event_handler，在這個線程函數(shù)里，實現(xiàn)了對touch事件的分析判斷和處理。
8）下面看看函數(shù)touch_event_handler
static int touch_event_handler(void *unused) {
??? struct sched_param param = { .sched_priority = RTPM_PRIO_TPD };
??? int x1=0, y1=0, x2=0, y2=0, x3=0, y3=0, x4=0, y4=0, p1=0, p2=0, p3=0, p4=0, id1=0xf, id2=0xf, id3=0xf, id4 = 0xf, pre_id1 = 0xf, pre_id2 = 0xf, pre_id3 = 0xf, pre_id4 = 0xf, pre_tt_mode = 0, finger_num = 0, pre_num = 0;
??? int raw_x1=0, raw_y1=0, raw_x2=0, raw_y2=0, raw_x3=0, raw_y3=0, raw_x4=0, raw_y4=0;
??? static char toggle;
??? static char buffer[32];//[16];
//??? int pending = 0;
?? ?u32 temp;
?? ?
??? sched_setscheduler(current, SCHED_RR, &param);
??? g_temptimerdiff=get_jiffies_64();//jiffies;
??? do {
?? ??? ?if(tpd_em_debuglog==1) {
?? ??? ??? ?TPD_DMESG("[mtk-tpd] %s\n", __FUNCTION__);
?? ??? ?}?? ??? ?
??????? set_current_state(TASK_INTERRUPTIBLE);
?? ?if(tpd_em_debuglog==1)
?? ??? ?TPD_DMESG("[mtk-tpd], %s, tpd_halt=%d\n", __FUNCTION__, tpd_halt);
??????? while (tpd_halt) {tpd_flag = 0; msleep(20);}
??????? wait_event_interruptible(waiter, tpd_flag != 0);
??????? //tpd_flag = 0;
??????? TPD_DEBUG_SET_TIME;
??????? set_current_state(TASK_RUNNING);
??????? temp =? *(volatile u32 *)CHR_CON0;?? ?
??????? temp &= (1<<13);
??????? if(temp!=0)
??????? {
?????? ??? ?if(tpd_em_debuglog==1)?? ?
?? ??????? ??? ?TPD_DMESG("[mtk-tpd], write 0x01 to 0x1D register!!\n");
?????? ??? ?buffer[0] = 0x01;
?????? ??? ?i2c_smbus_write_i2c_block_data(i2c_client, 0x1D, 1, &(buffer[0]));?? ??? ??? ?
??????? }
??????? else
??????? {
?????? ??? ?if(tpd_em_debuglog==1)?? ??? ??? ?
?????? ??? ??? ?TPD_DMESG("[mtk-tpd], write 0x00 to 0x1D register!!\n");
?????? ??? ?buffer[0] = 0x00;
?????? ??? ?i2c_smbus_write_i2c_block_data(i2c_client, 0x1D, 1, &(buffer[0])); ?? ??? ??? ?
??????? }??? ??? ??????? ?
??????? if (tpd_show_version) {
??????????? tpd_show_version = 0;
?????????????????????? ?
??????????? mt_set_gpio_mode(GPIO1, 0x00);
??????????? mt_set_gpio_dir(GPIO1, GPIO_DIR_OUT);
??????????? mt_set_gpio_pull_enable(GPIO1, GPIO_PULL_ENABLE);
??????????? mt_set_gpio_pull_select(GPIO1, GPIO_PULL_UP);
?????????? ?
??????????? mt_set_gpio_out(GPIO1, GPIO_OUT_ZERO);
??????????? msleep(100);?????????? ?
?????????????????????? ?
??????????? buffer[0] = 0x01; // reset touch panel mode
??????????? i2c_smbus_write_i2c_block_data(i2c_client, 0x00, 1, &(buffer[0]));
??????????? msleep(200);
?????????? ?
??????????? buffer[0] = 0x10; // swith to system information mode
??????????? i2c_smbus_write_i2c_block_data(i2c_client, 0x00, 1, &(buffer[0]));
??????????? msleep(200);
?????????? ?
??????????? i2c_smbus_read_i2c_block_data(i2c_client, 0x00, 8, &(buffer[0x0]));
??????????? i2c_smbus_read_i2c_block_data(i2c_client, 0x08, 8, &(buffer[0x8]));
??????????? i2c_smbus_read_i2c_block_data(i2c_client, 0x10, 8, &(buffer[0x10]));
??????????? i2c_smbus_read_i2c_block_data(i2c_client, 0x18, 8, &(buffer[0x18]));
??????????? printk("[mtk-tpd] Cypress Touch Panel ID %x.%x\n", buffer[0x07], buffer[0x08]);?????????? ?
??????????? printk("[mtk-tpd] Cypress Touch Panel Firmware Version %x.%x\n", buffer[0x15], buffer[0x16]);
??????????? buffer[0] = 0x04; // switch to operation mode
??????????? i2c_smbus_write_i2c_block_data(i2c_client, 0x00, 1, &(buffer[0]));
??????????? msleep(200);
???????????????????? ?
??????????? mt_set_gpio_out(GPIO1, GPIO_OUT_ONE);?????????? ?
??????????? mt_set_gpio_mode(GPIO1, 0x01);
??????????? mt_set_gpio_pull_enable(GPIO1, GPIO_PULL_ENABLE);
??????????? mt_set_gpio_pull_select(GPIO1, GPIO_PULL_UP);????????? ?
??????????? continue;
??????? }?????? ?
?????? ?
??????? i2c_smbus_read_i2c_block_data(i2c_client, 0x00, 8, &(buffer[0]));
??????? i2c_smbus_read_i2c_block_data(i2c_client, 0x08, 8, &(buffer[8]));
??????? i2c_smbus_read_i2c_block_data(i2c_client, 0x10, 8, &(buffer[16]));
??????? i2c_smbus_read_i2c_block_data(i2c_client, 0x18, 8, &(buffer[24]));?? ??? ?
?? ?if(tpd_em_debuglog==1)
?? ?{
??????? TPD_DMESG("[mtk-tpd]HST_MODE? : %x\n", buffer[0]);
??????? TPD_DMESG("[mtk-tpd]TT_MODE?? : %x\n", buffer[1]);
??????? TPD_DMESG("[mtk-tpd]TT_STAT?? : %x\n", buffer[2]);
?????? // TPD_DEBUG("[mtk-tpd]TOUCH_ID? : %x\n", buffer[8]);
?? ??? ?TPD_DMESG("[mtk-tpd]TOUCH_12ID? : %x\n", buffer[8]);
?? ??? ?TPD_DMESG("[mtk-tpd]TOUCH_34ID? : %x\n", buffer[21]);
?? ?}?? ?
?????? ?
??????? finger_num = buffer[2] & 0x0f;
?????? ?
??????? if (finger_num == 0 && pre_num ==0) {
??????????? msleep(10);
??????????? tpd_flag = 0;
??????????? pre_tt_mode = buffer[1];
??????????? continue;? ?
??????? }
?????? ?
??????? if (pre_tt_mode == buffer[1]) {
??????????? msleep(5);
??????????? tpd_flag = 0;
??????????? pre_tt_mode = buffer[1];
??????????? continue; ?
??????? }
?????? ?
??????? if (buffer[1] & 0x20) {
??????????? TPD_DEBUG("buffer not ready\n");
??????????? tpd_flag = 0;
??????????? pre_tt_mode = buffer[1];
??????????? continue; // buffer is not ready for use
??????? }
?????? ?
??????? id1 = (buffer[8] & 0xf0) >> 4;
??????? id2 = (buffer[8] & 0x0f);
?? ??? ?id3 = (buffer[21] & 0xf0) >> 4;
?? ??? ?id4 = (buffer[21] & 0x0f);
?????????????? ?
//??????? if (id1 != 0xf) {
?? ??? if(finger_num>=1) {
??????????? x1 = (((int)buffer[3]) << 8) + buffer[4];
??????????? y1 = (((int)buffer[5]) << 8) + buffer[6];
??????????? if(x1>2048 || y1>2048) {
?? ???????????? tpd_flag = 0;
?? ???????????? pre_tt_mode = buffer[1];
?? ???????????? continue;???????? ??? ??? ?
?????????? ??? ?}???????????? ?
??????????? p1 = buffer[7];
??????????? raw_x1 = x1; raw_y1 = y1;
??????????? tpd_calibrate(&x1, &y1);
??????????? tpd_down(raw_x1, raw_y1, x1, y1, p1);
??????????? if(counter_pointer==0)
?????????? ??? ?g_temptimerdiff=get_jiffies_64();//jiffies;
??????????? if(x_min==0&&y_min==0&&x_max==0&&y_max==0) {
?????????? ??? ??? ?x_min = x1;
?????????? ??? ??? ?y_min = y1;
?????????? ??? ??? ?x_max = x1;
?????????? ??? ??? ?y_max = y1;
?????????? ??? ?}
??????????? if(x1<x_min)
?????????? ??? ?x_min = x1;
??????????? if(x1>x_max)
?????????? ??? ?x_max = x1;
??????????? if(y1<y_min)
?????????? ??? ?y_min = y1;
??????????? if(y1>y_max)
?????????? ??? ?y_max = y1;
??????????? counter_pointer++;
??????????? if (time_after(jiffies, g_temptimerdiff + 100)){?? ?//1s
?????????? ??? ?TPD_DMESG("[mtk-tpd], x_min=%d, y_min=%d, x_max=%d, y_max=%d, counter_pointer=%d!!\n", x_min, y_min, x_max, y_max, counter_pointer);
?????????? ??? ?x_min=0;
?????????? ??? ?y_min=0;
?????????? ??? ?x_max=0;
?????????? ??? ?y_max=0;
?????????? ??? ?counter_pointer=0;
??????????? }
??????? }
?????? ?
//??????? if (id2 != 0xf || finger_num==2) {
?? ???? if(finger_num>=2) {
??????????? x2 = (((int)buffer[9]) << 8) + buffer[10];
??????????? y2 = (((int)buffer[11]) << 8) + buffer[12];
??????????? p2 = buffer[13];
??????????? raw_x2 = x2; raw_y2 = y2;
??????????? tpd_calibrate(&x2, &y2);
??????????? tpd_down(raw_x2, raw_y2, x2, y2, p2);
??????? }
//?? ?if(id3 != 0xf || finger_num==3) {
?? ???? if(finger_num>=3) {
??????????? x3 = (((int)buffer[16]) << 8) + buffer[17];
??????????? y3= (((int)buffer[18]) << 8) + buffer[19];
??????????? p3= buffer[20];
??????????? raw_x3 = x3; raw_y3 = y3;
??????????? tpd_calibrate(&x3, &y3);
??????????? tpd_down(raw_x3, raw_y3, x3, y3, p3);
?? ??? ?}

//?? ?if(id4 != 0xf || finger_num==4) {
?? ???? if(finger_num>=4) {
??????????? x4 = (((int)buffer[22]) << 8) + buffer[23];
??????????? y4= (((int)buffer[24]) << 8) + buffer[25];
??????????? p4= buffer[26];
??????????? raw_x4 = x4; raw_y4 = y4;
??????????? tpd_calibrate(&x4, &y4);
??????????? tpd_down(raw_x4, raw_y4, x4, y4, p4);
?? ??? ?}?? ?
?????? ?
?? ?if(pre_num>=1 && pre_id1==0xf) {
?? ??? ?if(finger_num>=1 && id1==0xf) {
?? ??? ??? ?if(tpd_em_debuglog==1)
?? ??? ??? ??? ?TPD_DMESG("finger1 is still down!\n");
?? ??? ?} else {
?? ??? ??? ?if(tpd_em_debuglog==1)
?? ??? ??? ??? ?TPD_DMESG("finger1 is up!!\n");
?? ??? ??? ?tpd_up(raw_x1, raw_y1, x1, y1, p1);
?? ??? ?}?? ??? ?
?? ??? ?
?? ?} else if(pre_num>=1 && pre_id1 !=0xf) {
?? ??? ?if(id1==pre_id1) {
?? ??? ??? ?if(tpd_em_debuglog==1)
?? ??? ??? ??? ?TPD_DMESG("finger1 is still down!!\n");
?? ??? ?} else {
?? ??? ??? ?if(tpd_em_debuglog==1)
?? ??? ??? ??? ?TPD_DMESG("finger1 is up!\n");
?? ??? ??? ?tpd_up(raw_x1, raw_y1, x1, y1, p1);
?? ??? ?}
?? ?}
?? ?
?? ?if(pre_num>=2 && pre_id2==0xf) {
?? ??? ?if((finger_num>=2 && id2==0xf) || (finger_num==1 && id1==0xf)) {
?? ??? ??? ?if(tpd_em_debuglog==1)
?? ??? ??? ??? ?TPD_DMESG("finger2 is still down!\n");
?? ??? ?} else {
?? ??? ??? ?if(tpd_em_debuglog==1)
?? ??? ??? ??? ?TPD_DMESG("finger2 is up!!\n");
?? ??? ??? ?tpd_up(raw_x2, raw_y2, x2, y2, p2);
?? ??? ?}?? ??? ?
?? ??? ?
?? ?} else if(pre_num>=2 && pre_id2 !=0xf) {
?? ??? ?if(id2==pre_id2 || id1==pre_id2) {
?? ??? ??? ?if(tpd_em_debuglog==1)
?? ??? ??? ??? ?TPD_DMESG("finger2 is still down!!\n");
?? ??? ?} else {
?? ??? ??? ?if(tpd_em_debuglog==1)
?? ??? ??? ??? ?TPD_DMESG("finger2 is up!\n");
?? ??? ??? ?tpd_up(raw_x2, raw_y2, x2, y2, p2);
?? ??? ?}
?? ?}

?? ?
?? ?if(pre_num>=3 && pre_id3==0xf) {
?? ??? ?if((finger_num>=3 && id3==0xf) || (finger_num==2 && id2==0xf) || (finger_num==1 && id1==0xf)) {
?? ??? ??? ?if(tpd_em_debuglog==1)
?? ??? ??? ??? ?TPD_DMESG("finger3 is still down!\n");
?? ??? ?} else {
?? ??? ??? ?if(tpd_em_debuglog==1)
?? ??? ??? ??? ?TPD_DMESG("finger3 is up!!\n");
?? ??? ??? ?tpd_up(raw_x3, raw_y3, x3, y3, p3);
?? ??? ?}?? ??? ?
?? ??? ?
?? ?} else if(pre_num>=3 && pre_id3 !=0xf) {
?? ??? ?if(id3==pre_id3 || id2==pre_id3 || id1==pre_id3) {
?? ??? ??? ?if(tpd_em_debuglog==1)
?? ??? ??? ??? ?TPD_DMESG("finger3 is still down!!\n");
?? ??? ?} else {
?? ??? ??? ?if(tpd_em_debuglog==1)
?? ??? ??? ??? ?TPD_DMESG("finger3 is up!\n");
?? ??? ??? ?tpd_up(raw_x3, raw_y3, x3, y3, p3);
?? ??? ?}
?? ?}

?? ?if(pre_num==4 && pre_id4==0xf) {
?? ??? ?if((finger_num>=4 && id4==0xf) || (finger_num==3 && id3==0xf) || (finger_num==2 && id2==0xf) || (finger_num==1 && id1==0xf)) {
?? ??? ??? ?if(tpd_em_debuglog==1)
?? ??? ??? ??? ?TPD_DMESG("finger4 is still down!\n");
?? ??? ?} else {
?? ??? ??? ?if(tpd_em_debuglog==1)
?? ??? ??? ??? ?TPD_DMESG("finger4 is up!!\n");
?? ??? ??? ?tpd_up(raw_x4, raw_y4, x4, y4, p4);
?? ??? ?}?? ??? ?
?? ??? ?
?? ?} else if(pre_num==4 && pre_id4 !=0xf) {
?? ??? ?if(id4==pre_id4 || id3==pre_id4 || id2==pre_id4 || id1==pre_id4) {
?? ??? ??? ?if(tpd_em_debuglog==1)
?? ??? ??? ??? ?TPD_DMESG("finger4 is still down!!\n");
?? ??? ?} else {
?? ??? ??? ?if(tpd_em_debuglog==1)
?? ??? ??? ??? ?TPD_DMESG("finger4 is up!\n");
?? ??? ??? ?tpd_up(raw_x4, raw_y4, x4, y4, p4);
?? ??? ?}
?? ?}
?? ??? ?if(tpd_em_debuglog==1)?? ?
?? ??? ??? ?TPD_DMESG("pre_id1=%d, pre_id2=%d, pre_id3=%d, pre_id4=%d, id1=%d, id2=%d, id3=%d, id4=%d\n", pre_id1, pre_id2, pre_id3, pre_id4, id1, id2, id3, id4);?? ??? ??? ??? ?
??????? pre_id1 = id1; pre_id2 = id2; pre_id3 = id3; pre_id4 = id4; pre_tt_mode = buffer[1];
?? ?pre_num = finger_num;
????? ?
?? ?if(tpd && tpd->dev && tpd_register_flag==1) {???? ?
?? ???????? input_sync(tpd->dev);
?? ?}
?????? ?
??????? i2c_smbus_read_i2c_block_data(i2c_client, 0x00, 1, &toggle);
??????? if((toggle & 0x80) == 0)
??????????? toggle = toggle | 0x80;
??????? else
??????????? toggle = toggle & (~0x80);
??????? i2c_smbus_write_i2c_block_data(i2c_client, 0x00, 1, &toggle); // switch the read toggle bit to do next sampling
??????? tpd_flag = 0;
? ?
??? } while (!kthread_should_stop());
??? return 0;
}
9）這里面，我們看到幾個新函數(shù)
tpd_calibrate，tpd_down，tpd_up
主要是通過傳入坐標值，對TOUCH的down和up值做處理。
void tpd_down(int raw_x, int raw_y, int x, int y, int p) {
?? ?if(tpd && tpd->dev && tpd_register_flag==1) {
??? input_report_abs(tpd->dev, ABS_PRESSURE, p/PRESSURE_FACTOR);
??? input_report_key(tpd->dev, BTN_TOUCH, 1);
??? input_report_abs(tpd->dev, ABS_MT_TOUCH_MAJOR, p/PRESSURE_FACTOR);
??? input_report_abs(tpd->dev, ABS_MT_WIDTH_MAJOR, p/PRESSURE_FACTOR);
??? input_report_abs(tpd->dev, ABS_MT_POSITION_X, x);
??? input_report_abs(tpd->dev, ABS_MT_POSITION_Y, y);
??? input_mt_sync(tpd->dev);
??? TPD_DEBUG("D[%4d %4d %4d]\n", x, y, p);
??? TPD_EM_PRINT(raw_x, raw_y, x, y, p, 1);
? } ?
}
void tpd_up(int raw_x, int raw_y, int x, int y, int p) {
?? ?if(tpd && tpd->dev && tpd_register_flag==1) {
??? input_report_abs(tpd->dev, ABS_PRESSURE, 0);
??? input_report_key(tpd->dev, BTN_TOUCH, 0);
??? input_report_abs(tpd->dev, ABS_MT_TOUCH_MAJOR, 0);
??? input_report_abs(tpd->dev, ABS_MT_WIDTH_MAJOR, 0);
??? input_report_abs(tpd->dev, ABS_MT_POSITION_X, x);
??? input_report_abs(tpd->dev, ABS_MT_POSITION_Y, y);
??? input_mt_sync(tpd->dev);
??? TPD_DEBUG("U[%4d %4d %4d]\n", x, y, 0);
??? TPD_EM_PRINT(raw_x, raw_y, x, y, p, 0);
? } ?
}
這里面主要通過驅動linux的輸入設備驅動函數(shù)input_report_abs， input_report_key把linux輸入設備的坐標和輸入設備事件提交到linux內(nèi)核里面去。

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