RK3288 Android8.1添加lvds以及gt9触摸屏(二)

现在先说gt9触摸屏如何配置

首先拿到硬件厂商提供的cfg以及gt9xx文件夹

驱动源码路径：kernel/drivers/input/touchscreen/gtxx 

注：可以自己定义最后把gt9xx.h以及gt9xx.c文件放在哪，放在哪就在makefile里指定对应位置

1.touchscreen文件夹下的Kconfig配置，主要是最后一句，应用到对应文件夹下的Kconfig

2.touchscreen文件夹下makefile配置，指向对应文件夹下

3.gtxx文件夹下的Kconfig配置

config TOUCHSCREEN_GTX911_MST
        tristate "gtx911 touchscreen gt911 rk3288 for marvsmart"
	default y
        help
           This enables support for goodix touchscreens.

4.gtxx文件夹下的Kconfig配置

obj-$(CONFIG_TOUCHSCREEN_GTX911_MST)  += gt9xx.o gt9xx_update.o #goodix_tool.o

 5.修改设备树，更改dts里配置，添加gt9xx

&i2c4 {
	status = "okay";
      
        goodix_ts@5d {
                compatible = "goodix,gt9xx";
                reg = <0x5d>;
                goodix,rst-gpio = <&gpio7 5 GPIO_ACTIVE_LOW>;
                goodix,irq-gpio = <&gpio7 6 IRQ_TYPE_EDGE_RISING>;
                };
};

6.配置defconfig,注意这里的TOUCHSCREEN_GTX911_MST和前面touchscreen配置的是一一对应的

CONFIG_INPUT_TOUCHSCREEN=y
CONFIG_TOUCHSCREEN_GTX911_MST=y

7.源码修改

gt9xx.h 文件配置修改
#define DEBUG_SWITCH  	        1 开启调试开关，打印信息（很重要）
#define GTP_CUSTOM_CFG	        1 用来用户自定义设置；
#define GTP_DRIVER_SEND_CFG     1 用来发送CFG文件配置；
group是厂家指定，6个group(0 - 5),该方案配置group3

// TODO: define your config for Sensor_ID == 3 here, if needed
#define CTP_CFG_GROUP3 {\
	//厂家提供
     0x00,0x00,0x04,0x58,0x02,0x05,0x0C,0x20,0x02,0xC6,0x28,0x0F,0x64,0x50,0x03, \
	 0x06,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x18,0x1A,0x1E,0x14,0x8A,0x29,0x0C, \
	 0x2A,0x28,0x0F,0x0A,0x00,0x00,0x00,0x81,0x03,0x11,0x00,0x01,0x00,0x00,0x00, \
	 0x03,0x00,0x00,0x00,0x00,0x00,0x14,0x52,0x94,0xC5,0x02,0x07,0x00,0x00,0x04, \
	 0xD4,0x17,0x00,0xA6,0x1E,0x00,0x80,0x28,0x00,0x62,0x36,0x00,0x4E,0x47,0x00, \
	 0x4E,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, \
	 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x18,0x16,0x14,0x12,0x10,0x0E,0x0C,0x0A, \
	 0x08,0x06,0x04,0x02,0xFF,0xFF,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, \
	 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x22,0x21,0x20,0x1F,0x1E,0x1D,0x1C,0x18, \
	 0x16,0x12,0x10,0x0F,0x0C,0x0A,0x08,0x06,0x04,0x02,0x00,0xFF,0xFF,0xFF,0xFF, \
	 0xFF,0xFF,0xFF,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, \
	 0x00,0x00,0x00,0x00,0xFB,0x01 \
}

gt9xxx.c源码分析

触摸屏通过iic控制，驱动部分适配了5种不同的屏幕，通过读取触摸ic（GT9XX）的sensor id来判断，适配哪个屏幕，即哪个cfg。

static s32 gtp_init_panel(struct goodix_ts_data *ts)
{
……
    ret = gtp_i2c_read_dbl_check(ts->client, GTP_REG_SENSOR_ID, &sensor_id, 1);
    if (SUCCESS == ret)
    {
        if (sensor_id >= 0x06)
        {
            GTP_ERROR("Invalid sensor_id(0x%02X), No Config Sent!", sensor_id);
            ts->pnl_init_error = 1;
            return -1;
        }
    }
    else
    {
        GTP_ERROR("Failed to get sensor_id, No config sent!");
        ts->pnl_init_error = 1;
        return -1;
    }
    GTP_INFO("Sensor_ID: %d", sensor_id);

        /* parse config data*/
#ifdef GTP_CONFIG_OF
        GTP_DEBUG("Get config data from device tree.");
        ret = gtp_parse_dt_cfg(&ts->client->dev, &config[GTP_ADDR_LENGTH], &ts->gtp_cfg_len, sensor_id);
        if (ret < 0) {
                GTP_ERROR("Failed to parse config data form device tree.");
                ts->pnl_init_error = 1;
                return -1;
        }
#else
        GTP_DEBUG("Get config data from header file.");
    if ((!cfg_info_len[1]) && (!cfg_info_len[2]) &&
        (!cfg_info_len[3]) && (!cfg_info_len[4]) &&
        (!cfg_info_len[5]))
    {
        sensor_id = 0;
    }
        ts->gtp_cfg_len = cfg_info_len[sensor_id];
        memset(&config[GTP_ADDR_LENGTH], 0, GTP_CONFIG_MAX_LENGTH);
        memcpy(&config[GTP_ADDR_LENGTH], send_cfg_buf[sensor_id], ts->gtp_cfg_len);
#endif

……
}

注意：如果屏幕可以触摸，但定位有误，第一反应就是cfg配置是否正确，通过串口获取sersor_Id到底是几，然后查看对应CTP_CFG_GROUP配置是否正确