/***************************************************************************
* Linux sysfs device_attribute
* 声明：
* 本文主要是记录linux驱动中如何在sysfs中生成设备属性。
*
* 2016-2-22 深圳 南山平山村 曾剑锋
**************************************************************************/
static ssize_t show_firmware_version(struct device *dev, <----------+
struct device_attribute *attr, char *buf) |
{ |
struct bq27x00_device_info *di = dev_get_drvdata(dev); |
int ver; |
|
ver = bq27x00_battery_read_fw_version(di); |
|
return sprintf(buf, "%d\n", ver); |
} |
|
static ssize_t show_dataflash_version(struct device *dev, <----------*-+
struct device_attribute *attr, char *buf) | |
{ | |
struct bq27x00_device_info *di = dev_get_drvdata(dev); | |
int ver; | |
| |
ver = bq27x00_battery_read_dataflash_version(di); | |
| |
return sprintf(buf, "%d\n", ver); | |
} | |
| |
static ssize_t show_device_type(struct device *dev, <-----------*-*-+
struct device_attribute *attr, char *buf) | | |
{ | | |
struct bq27x00_device_info *di = dev_get_drvdata(dev); | | |
int dev_type; | | |
| | |
dev_type = bq27x00_battery_read_device_type(di); | | |
| | |
return sprintf(buf, "%d\n", dev_type); | | |
} | | |
| | |
static ssize_t show_reset(struct device *dev, <----------*-*-*-+
struct device_attribute *attr, char *buf) | | | |
{ | | | |
struct bq27x00_device_info *di = dev_get_drvdata(dev); | | | |
| | | |
bq27x00_battery_reset(di); | | | |
| | | |
return sprintf(buf, "okay\n"); | | | |
} | | | |
| | | |
static DEVICE_ATTR(fw_version, S_IRUGO, show_firmware_version, NULL); <------+ | | |
static DEVICE_ATTR(df_version, S_IRUGO, show_dataflash_version, NULL); <------|-+ | |
static DEVICE_ATTR(device_type, S_IRUGO, show_device_type, NULL); <------|-|-+ |
static DEVICE_ATTR(reset, S_IRUGO, show_reset, NULL); <------|-|-|-+
| | | |
static struct attribute *bq27x00_attributes[] = { <---------+ | | | |
&dev_attr_fw_version.attr, ---------*-----+ | | |
&dev_attr_df_version.attr, ---------*-------+ | |
&dev_attr_device_type.attr, ---------*---------+ |
&dev_attr_reset.attr, ---------*-----------+
NULL |
}; |
|
static const struct attribute_group bq27x00_attr_group = { <---------*------+
.attrs = bq27x00_attributes, ------+ |
}; |
|
static int __init bq27x00_battery_probe(struct i2c_client *client, |
const struct i2c_device_id *id) |
{ |
...... |
retval = sysfs_create_group(&client->dev.kobj, &bq27x00_attr_group); -------+
if (retval)
dev_err(&client->dev, "could not create sysfs files\n");
return 0;
......
}
/**
* root@android:/sys/bus/i2c/devices/2-0055 # ls
* device_type
* df_version
* driver
* fw_version
* modalias
* name
* power
* power_supply
* reset
* subsystem
* uevent
* root@android:/sys/bus/i2c/devices/2-0055 #
*/
