android驱动下生成设备节点的方法

echo 1 > /sys/devices/platform/s3c2440-i2c.2/i2c-2/2-0055/bqfs_update

static ssize_t set_bqfs_update(struct device *dev,

struct device_attribute *attr, const char *buf,

size_t count)

{

struct bq27410_device_info *di = dev_get_drvdata(dev);

unsigned int val;

if (!(sscanf(buf, "%u\n", &val)))

return -EINVAL;

//upgrade BFG file

bq27410_DEBUG("set_bqfs_update %d\n", val);

bq27410_upgrade(di);

return count;

}

static DEVICE_ATTR(bqfs_update, S_IRUGO | S_IWUSR, NULL, set_bqfs_update);

static struct attribute *bq27410_sysfs_entries[] = {

&dev_attr_bqfs_update.attr,

NULL

};

static struct attribute_group bq27410_attr_group = {

.name = NULL,

.attrs = bq27410_sysfs_entries,

};

struct i2c_client *client

retval = sysfs_create_group(&client->dev.kobj, &bq27410_attr_group);

if (retval) {

bq27410_DEBUG("sysfs_create_group failed\n");

goto batt_failed_5;

}