gt911_ts

GT911 Touch Screen Driver For Rockchip

How to configure in your device:

1. Clone into drivers/input/touchscreen/gt9xx

2. Add in drivers/input/touchscreen/Kconfig

   config TOUCHSCREEN_GT9XX_IIC
   	tristate "GT9xx_IIC based touchscreens"
   	depends on I2C2_RK30
   	
   source "drivers/input/touchscreen/gt9xx/Kconfig"
   

3. Add in drivers/input/touchscreen/Makefile

   obj-$(CONFIG_TOUCHSCREEN_GT9XX_IIC)      +=  gt9xx/
   

4. Add platform structure to your arch/arm/plat-rk/include/plat/board.h file

   struct goodix_9xx_platform_data 
   {
       int model;
       unsigned gpio_shutdown;
       unsigned gpio_irq;
       unsigned gpio_reset;
       bool irq_edge; /* 0:rising edge, 1:falling edge */
       int xmax;
       int ymax;
       int config_info_len;
       u8 *config_info;
       int (*init_platform_hw)(void);
       int (*exit_platform_hw)(void);
       bool send_config;	// Sends config_info, instead ROM's confing
       bool custom_config; // Sends xmax, ymax, irq edge instead stuff in config
       bool mirrorxy;
       bool swap_xy;
   };

5. Setup touchpanel config in your board file. Make sure you replace goodix_config data with yours!

   #if defined(CONFIG_TOUCHSCREEN_GT9XX_IIC)
   
   #define TOUCH_RESET_PIN  RK30_PIN4_PD0
   #define TOUCH_INT_PIN    RK30_PIN4_PC2
   #define TOUCH_PWR_PIN    INVALID_GPIO
   
   	int goodix_init_platform_hw(void)
   	{
   		int ret;
   		
   		if (TOUCH_PWR_PIN != INVALID_GPIO) {
   			ret = gpio_request(TOUCH_PWR_PIN, "goodix power pin");
   			if (ret != 0) {
   				gpio_free(TOUCH_PWR_PIN);
   				printk("goodix power error\n");
   				return -EIO;
   			}
   			gpio_direction_output(TOUCH_PWR_PIN, 0);
   			gpio_set_value(TOUCH_PWR_PIN, GPIO_LOW);
   			msleep(100);
   		}
   		
   		if (TOUCH_INT_PIN != INVALID_GPIO) {
   			ret = gpio_request(TOUCH_INT_PIN, "goodix irq pin");
   			if (ret != 0) {
   				gpio_free(TOUCH_INT_PIN);
   				printk("goodix irq error\n");
   				return -EIO;
   			}
   		}	
   
   		if (TOUCH_RESET_PIN != INVALID_GPIO) {
   			ret = gpio_request(TOUCH_RESET_PIN, "goodix reset pin");
   			if (ret != 0) {
   				gpio_free(TOUCH_RESET_PIN);
   				printk("goodix gpio_request error\n");
   				return -EIO;
   			}
   			
   		   gpio_direction_output(TOUCH_RESET_PIN, 0);
   		   gpio_set_value(TOUCH_RESET_PIN,GPIO_HIGH);  
   		   msleep(50);
   		   gpio_set_value(TOUCH_RESET_PIN,GPIO_LOW);
   		   msleep(50);
   		   gpio_set_value(TOUCH_RESET_PIN,GPIO_HIGH);
   		   msleep(50);
   
   		}
   		return 0;
   	}
   
   void goodix_exit_platform_hw(void)
   {
       gpio_free(TOUCH_RESET_PIN);
       gpio_free(TOUCH_INT_PIN);
   }
   
   u8 goodix_config[] = {
   	0x50,0x00,0x04,0x00,0x03,0x05,0x35,0x00,0x03,0x0D,0x14,0x0F,0x5F,
   	0x55,0x03,0x05,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x18,0x1A,0x1E,
   	0x14,0x8C,0x27,0x0E,0x1D,0x23,0x04,0x0D,0x00,0x00,0x00,0x9B,0x02,
   	0x35,0x00,0x00,0x00,0x00,0x00,0x03,0x64,0x32,0x00,0x00,0x00,0x32,
   	0xFA,0x01,0x00,0x00,0x08,0x00,0x00,0x7B,0x15,0x15,0x7B,0x15,0x1D,
   	0x4B,0x1D,0x23,0x4B,0x1D,0x29,0x33,0x21,0x39,0x00,0x00,0x00,0x00,
   	0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
   	0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
   	0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x02,0x04,0x06,0x08,0x0A,
   	0x0C,0x0E,0x10,0x12,0x14,0x16,0x18,0x1A,0x1C,0xFF,0xFF,0xFF,0xFF,
   	0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0x00,
   	0x02,0x04,0x06,0x08,0x0A,0x0C,0x0F,0x10,0x12,0x13,0x14,0x16,0x18,
   	0x1C,0x1D,0x1E,0x1F,0x20,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
   	0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
   	0xFF,0xFF,0x7E,0x01
   };
   
   struct goodix_9xx_platform_data goodix_info = 
   {
   	.model = 9110,
       .irq_edge = 1, /* 0:rising edge, 1:falling edge */
   	.gpio_shutdown = INVALID_GPIO,
       .gpio_irq = TOUCH_INT_PIN,
       .gpio_reset = TOUCH_RESET_PIN,
   	.swap_xy = 1,
   	.mirrorxy = 0,
   	.xmax = 1024,
   	.ymax = 768,
   	.send_config = 1,
   	.custom_config = 1,
   	.config_info_len = ARRAY_SIZE(goodix_config),
       .config_info = goodix_config,
   	.init_platform_hw = goodix_init_platform_hw,
   	.exit_platform_hw = goodix_exit_platform_hw,
   };
   #endif
   
   //...
   #ifdef CONFIG_I2C2_RK30
   static struct i2c_board_info __initdata i2c2_info[] = {
   #if defined (CONFIG_TOUCHSCREEN_GT9XX_IIC)
   	{
   		.type          = "Goodix-TS",
   		.addr          = 0x5d,
   		.flags         = 0,
   		.irq           = TOUCH_INT_PIN,
   		.platform_data = &goodix_info,
   	},
   #endif