I2C设备驱动编写,struct i2c_device_id,struct i2c_driver,i2c_add_driver,i2c_register_board_info
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我的理念:简单实用即可,不要搞一堆源码出来,结果让人看了以后还不知道怎么用,看我的:
1、在arch/arm/mach-xxx/ 自己的平台文件里添加i2c信息,美其名曰:i2c_board_info
例如:
static struct i2c_board_info __initdata xxxi2c_board_info[] = {
{
I2C_BOARD_INFO("abcd1", 0x20), /* 字符串要与后面的匹配,0x20是从设备地址 */
.platform_data = 0,
},
{
I2C_BOARD_INFO("abcd2", 0x21),
.platform_data = 0,
},
};
然后调用i2c_register_board_info(1, xxxi2c_board_info, ARRAY_SIZE(xxxi2c_board_info));
第一个参数是0还是1,我还不知道:-(
2、在另外一个设备驱动文件里,比如你放到/driver/char下做字符设备,一般是module_init(func_init())形式,则调用i2c_add_driver()即可,有几个要定义:
static const struct i2c_device_id xxx_led_id[] = {
{ "abcd1", 0 }, /* 该名称必须与BOARD_INFO的匹配才会调用probe函数 */
{ "abcd2", 0 },
{ }
};
MODULE_DEVICE_TABLE(i2c, xxx_led_id);
static struct i2c_driver xxx_led_driver = {
.driver = {
.name = "yourname", /* 该名字不需要与别的匹配 */
.owner = THIS_MODULE,
},
.probe = xxx_led_probe,
.remove = xxx_remove,
.id_table = xxx_led_id,
};
看到了吧,struct i2c_device_id里面的字符串与 I2C_BOARD_INFO里面的匹配后,xxx_led_probe才会调用。
如果不想用同一个probe,那就在写一个struct i2c_device_id和struct i2c_driver
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