【I2C设备驱动】必须将id_table[]数组的最后一个元素设置为空的原因

struct i2c_device_id {
char name[I2C_NAME_SIZE];
kernel_ulong_t driver_data;  /* Data private to the driver */
}

static const struct i2c_device_id rt5677_i2c_id[] = {
{ "rt5677", 0 },
{ }    // 末尾需要是一个空元素
};

struct i2c_driver rt5677_i2c_driver = {
.driver = {
.name = "rt5677",
.owner = THIS_MODULE,
#ifdef CONFIG_PM
.pm = &rt5677_pm_ops,
#endif
#ifdef RTACPI_I2C
.acpi_match_table = ACPI_PTR(rt5677_acpi_match),
#endif
},
.probe = rt5677_i2c_probe,
.remove   = rt5677_i2c_remove,
.shutdown = rt5677_i2c_shutdown,
.id_table = rt5677_i2c_id,    // 指定id_table
};

/**
* hda_match - bind hda device to hda driver.
* @dev: device.
* @drv: driver.
*
*/
static int soc_hda_match(struct device *dev, struct device_driver *drv)
{
struct snd_soc_hda_device *pdev = to_soc_hda_device(dev);
struct snd_soc_hda_driver *pdrv = to_soc_hda_driver(drv);

/* Then try to match against the id table */
if (pdrv->id_table)
return soc_hda_match_id(pdrv->id_table, pdev) != NULL;    // 传入 id_table 指针进行匹配

/* fall-back to driver name match */
return (strcmp(pdev->name, drv->name) == 0);
}

static const struct snd_soc_hda_device_id *soc_hda_match_id(
const struct snd_soc_hda_device_id *id,
struct snd_soc_hda_device *pdev)
{
while (id->name[0]) {  // 如果 name 不为空，则执行下列匹配
if (pdev->id == id->id) {
pdev->id_entry = id;
return id;
} else if (strcmp(pdev->name, id->name) == 0) {
pdev->id_entry = id;
return id;
}
id++;  // 继续处理 id_table 中的下一个元素
}
return NULL;
}

while

{}

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