/sys/bus/i2c/devices下的内容与i2c_board_info结构体
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在目录/sys/bus/i2c/devices下能发现系统中的I2C设备,如下:
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# ls
0-0034
0-0030
0-0011
0-0058
# ls
0-0034
0-0030
0-0011
0-0058
这些设备就是系统中存在的设备。
这些设备是怎么来的?
在你对应的machine配置里会执行“i2c_register_board_info”一个函数,它会将一个i2c_board_info的结构体注册进系统,
这个i2c_board_info的结构体里就描述了板载的所有I2C设备信息,如下例:
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static struct i2c_board_info littleton_i2c_board_info[] = {
#if defined(CONFIG_PXA3xx_MICCO) || defined(CONFIG_PXA3xx_MICCO_MODULE)
{
.type = "micco",
.addr = 0x34,
.platform_data = &micco_data,
.irq = IRQ_GPIO(mfp_to_gpio(MFP_PIN_GPIO18)),
},
#endif
#if defined(CONFIG_GPIO_MAX7320) || defined(CONFIG_GPIO_MAX7320_MODULE)
{
.type = "max7320",
.addr = 0x50,
.platform_data = &exp0_pdata,
},
#endif
#if defined(CONFIG_GPIO_MAX7321) || defined(CONFIG_GPIO_MAX7321_MODULE)
{
/* on 8385 WLAN Board */
.type = "max7321",
.addr = 0x60,
.platform_data = &exp1_pdata[BOARD_8385_WLAN],
},
{
/* on UMTS Board */
.type = "max7321",
.addr = 0x61,
.platform_data = &exp1_pdata[BOARD_UMTS],
},
{
/* on Siemens Baseband Radio Interposer Board */
.type = "max7321",
.addr = 0x62,
.platform_data = &exp1_pdata[BOARD_SIEMENS_BASEBAND],
},
{
/* on 8688 WLAN/Camera Board */
.type = "max7321",
.addr = 0x63,
.platform_data = &exp1_pdata[BOARD_8688_WLAN_CAMERA],
},
{
/* on Camera Board */
.type = "max7321",
.addr = 0x64,
.platform_data = &exp1_pdata[BOARD_CAMERA],
},
{
/* on 8686 WLAN/Camera Board */
.type = "max7321",
.addr = 0x66,
.platform_data = &exp1_pdata[BOARD_8386_WLAN_CAMERA],
},
{
/* on 8385 WLAN/Camera Board */
.type = "max7321",
.addr = 0x6c,
.platform_data = &exp1_pdata[BOARD_8385_WLAN_CAMERA],
},
{
/* on 8688 WLAN Board */
.type = "max7321",
.addr = 0x6d,
.platform_data = &exp1_pdata[BOARD_8688_WLAN],
.irq = IRQ_GPIO(mfp_to_gpio(MFP_PIN_GPIO77)),
},
#endif
#if defined(CONFIG_PXA_CAMERA)
{
.type = "sensor_ov7673",
.addr = 0x21,
.platform_data = &ov7673_sensor_data,
},
{
.type = "sensor_ov5623",
.addr = 0x30,
.platform_data = &ov5623_sensor_data,
},
#endif
};
static struct i2c_board_info littleton_i2c_board_info[] = {
#if defined(CONFIG_PXA3xx_MICCO) || defined(CONFIG_PXA3xx_MICCO_MODULE)
{
.type = "micco",
.addr = 0x34,
.platform_data = &micco_data,
.irq = IRQ_GPIO(mfp_to_gpio(MFP_PIN_GPIO18)),
},
#endif
#if defined(CONFIG_GPIO_MAX7320) || defined(CONFIG_GPIO_MAX7320_MODULE)
{
.type = "max7320",
.addr = 0x50,
.platform_data = &exp0_pdata,
},
#endif
#if defined(CONFIG_GPIO_MAX7321) || defined(CONFIG_GPIO_MAX7321_MODULE)
{
/* on 8385 WLAN Board */
.type = "max7321",
.addr = 0x60,
.platform_data = &exp1_pdata[BOARD_8385_WLAN],
},
{
/* on UMTS Board */
.type = "max7321",
.addr = 0x61,
.platform_data = &exp1_pdata[BOARD_UMTS],
},
{
/* on Siemens Baseband Radio Interposer Board */
.type = "max7321",
.addr = 0x62,
.platform_data = &exp1_pdata[BOARD_SIEMENS_BASEBAND],
},
{
/* on 8688 WLAN/Camera Board */
.type = "max7321",
.addr = 0x63,
.platform_data = &exp1_pdata[BOARD_8688_WLAN_CAMERA],
},
{
/* on Camera Board */
.type = "max7321",
.addr = 0x64,
.platform_data = &exp1_pdata[BOARD_CAMERA],
},
{
/* on 8686 WLAN/Camera Board */
.type = "max7321",
.addr = 0x66,
.platform_data = &exp1_pdata[BOARD_8386_WLAN_CAMERA],
},
{
/* on 8385 WLAN/Camera Board */
.type = "max7321",
.addr = 0x6c,
.platform_data = &exp1_pdata[BOARD_8385_WLAN_CAMERA],
},
{
/* on 8688 WLAN Board */
.type = "max7321",
.addr = 0x6d,
.platform_data = &exp1_pdata[BOARD_8688_WLAN],
.irq = IRQ_GPIO(mfp_to_gpio(MFP_PIN_GPIO77)),
},
#endif
#if defined(CONFIG_PXA_CAMERA)
{
.type = "sensor_ov7673",
.addr = 0x21,
.platform_data = &ov7673_sensor_data,
},
{
.type = "sensor_ov5623",
.addr = 0x30,
.platform_data = &ov5623_sensor_data,
},
#endif
};
可以发现,在目录/sys/bus/i2c/devices下的设备就是这个i2c_board_info结构体里所描述的I2C设备,
而/sys/bus/i2c/devices下的设备名字就是根据i2c_board_info结构体中定义的I2C Address来命名的
本文来自CSDN博客,转载请标明出处:http://blog.csdn.net/codehat/archive/2010/03/04/5344897.aspx
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