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本文详细介绍了基于I2C接口的Synaptics触摸屏设备配置过程，包括设备信息定义、驱动实现、Makefile构建指令及Kconfig配置选项。通过具体代码示例展示了如何在Linux环境下设置和管理I2C触摸屏。

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1，设备

Board-sapphire.c (arch/arm/mach-msm):

static struct i2c_board_info i2c_devices[] = {
{
I2C_BOARD_INFO(SYNAPTICS_I2C_RMI_NAME, 0x20),
.platform_data = sapphire_ts_data,
.irq = SAPPHIRE_GPIO_TO_INT(SAPPHIRE_GPIO_TP_ATT_N)
},
{
I2C_BOARD_INFO(ELAN_8232_I2C_NAME, 0x10),
.platform_data = &elan_i2c_data,
.irq = SAPPHIRE_GPIO_TO_INT(SAPPHIRE_GPIO_TP_ATT_N),
},
{
I2C_BOARD_INFO("akm8976", 0x1C),
.platform_data = &compass_platform_data,
.irq = SAPPHIRE_GPIO_TO_INT(SAPPHIRE_GPIO_COMPASS_IRQ),
},
{
I2C_BOARD_INFO("mt9t013", 0x6C >> 1),
.platform_data = &msm_camera_device_mt9t013,
},
};

2，驱动

Synaptics_i2c_rmi.c (drivers/input/touchscreen):

static const struct i2c_device_id synaptics_ts_id[] = {
{ SYNAPTICS_I2C_RMI_NAME, 0 },
{ }
};

static struct i2c_driver synaptics_ts_driver = {
.probe= synaptics_ts_probe,
.remove= synaptics_ts_remove,
#ifndef CONFIG_HAS_EARLYSUSPEND
.suspend= synaptics_ts_suspend,
.resume= synaptics_ts_resume,
#endif
.id_table= synaptics_ts_id,
.driver = {
.name= SYNAPTICS_I2C_RMI_NAME,
},
};

3，Makefile

obj-$(CONFIG_TOUCHSCREEN_SYNAPTICS_I2C_RMI)+= synaptics_i2c_rmi.o

4，Kconfig

config TOUCHSCREEN_SYNAPTICS_I2C_RMI
tristate "Synaptics i2c touchscreen"
depends on I2C
help
This enables support for Synaptics RMI over I2C based touchscreens.