hwmon: (lm87) Use hwmon to create the sysfs groups

This is the expected thing for a hwmon driver to do, this changes
the sysfs paths from, say:

  /sys/bus/i2c/devices/0-002c/temp1_input

to:

  /sys/bus/i2c/devices/0-002c/hwmon/hwmon0/temp1_input

Signed-off-by: Jason Gunthorpe <jgunthorpe@obsidianresearch.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>

diff --git a/drivers/hwmon/lm87.c b/drivers/hwmon/lm87.c
index a5e2958..81cb898 100644 (file)
--- a/drivers/hwmon/lm87.c
+++ b/drivers/hwmon/lm87.c
@@ -154,7 +154,6 @@ static u8 LM87_REG_TEMP_LOW[3] = { 0x3A, 0x38, 0x2C };
  */
 
 struct lm87_data {
-       struct device *hwmon_dev;
        struct mutex update_lock;
        char valid; /* zero until following fields are valid */
        unsigned long last_updated; /* In jiffies */
@@ -181,6 +180,8 @@ struct lm87_data {
        u16 alarms;             /* register values, combined */
        u8 vid;                 /* register values, combined */
        u8 vrm;
+
+       const struct attribute_group *attr_groups[6];
 };
 
 static inline int lm87_read_value(struct i2c_client *client, u8 reg)
@@ -195,7 +196,7 @@ static inline int lm87_write_value(struct i2c_client *client, u8 reg, u8 value)
 
 static struct lm87_data *lm87_update_device(struct device *dev)
 {
-       struct i2c_client *client = to_i2c_client(dev);
+       struct i2c_client *client = dev_get_drvdata(dev);
        struct lm87_data *data = i2c_get_clientdata(client);
 
        mutex_lock(&data->update_lock);
@@ -309,7 +310,7 @@ static ssize_t show_in_max(struct device *dev,
 static ssize_t set_in_min(struct device *dev, struct device_attribute *attr,
                          const char *buf, size_t count)
 {
-       struct i2c_client *client = to_i2c_client(dev);
+       struct i2c_client *client = dev_get_drvdata(dev);
        struct lm87_data *data = i2c_get_clientdata(client);
        int nr = to_sensor_dev_attr(attr)->index;
        long val;
@@ -330,7 +331,7 @@ static ssize_t set_in_min(struct device *dev, struct device_attribute *attr,
 static ssize_t set_in_max(struct device *dev,  struct device_attribute *attr,
                          const char *buf, size_t count)
 {
-       struct i2c_client *client = to_i2c_client(dev);
+       struct i2c_client *client = dev_get_drvdata(dev);
        struct lm87_data *data = i2c_get_clientdata(client);
        int nr = to_sensor_dev_attr(attr)->index;
        long val;
@@ -396,7 +397,7 @@ static ssize_t show_temp_high(struct device *dev,
 static ssize_t set_temp_low(struct device *dev, struct device_attribute *attr,
                            const char *buf, size_t count)
 {
-       struct i2c_client *client = to_i2c_client(dev);
+       struct i2c_client *client = dev_get_drvdata(dev);
        struct lm87_data *data = i2c_get_clientdata(client);
        int nr = to_sensor_dev_attr(attr)->index;
        long val;
@@ -416,7 +417,7 @@ static ssize_t set_temp_low(struct device *dev, struct device_attribute *attr,
 static ssize_t set_temp_high(struct device *dev, struct device_attribute *attr,
                             const char *buf, size_t count)
 {
-       struct i2c_client *client = to_i2c_client(dev);
+       struct i2c_client *client = dev_get_drvdata(dev);
        struct lm87_data *data = i2c_get_clientdata(client);
        int nr = to_sensor_dev_attr(attr)->index;
        long val;
@@ -495,7 +496,7 @@ static ssize_t show_fan_div(struct device *dev,
 static ssize_t set_fan_min(struct device *dev, struct device_attribute *attr,
                           const char *buf, size_t count)
 {
-       struct i2c_client *client = to_i2c_client(dev);
+       struct i2c_client *client = dev_get_drvdata(dev);
        struct lm87_data *data = i2c_get_clientdata(client);
        int nr = to_sensor_dev_attr(attr)->index;
        long val;
@@ -522,7 +523,7 @@ static ssize_t set_fan_min(struct device *dev, struct device_attribute *attr,
 static ssize_t set_fan_div(struct device *dev, struct device_attribute *attr,
                           const char *buf, size_t count)
 {
-       struct i2c_client *client = to_i2c_client(dev);
+       struct i2c_client *client = dev_get_drvdata(dev);
        struct lm87_data *data = i2c_get_clientdata(client);
        int nr = to_sensor_dev_attr(attr)->index;
        long val;
@@ -635,7 +636,7 @@ static ssize_t show_aout(struct device *dev, struct device_attribute *attr,
 static ssize_t set_aout(struct device *dev, struct device_attribute *attr,
                        const char *buf, size_t count)
 {
-       struct i2c_client *client = to_i2c_client(dev);
+       struct i2c_client *client = dev_get_drvdata(dev);
        struct lm87_data *data = i2c_get_clientdata(client);
        long val;
        int err;
@@ -841,23 +842,18 @@ static int lm87_detect(struct i2c_client *client, struct i2c_board_info *info)
        return 0;
 }
 
-static void lm87_remove_files(struct i2c_client *client)
+static void lm87_restore_config(void *arg)
 {
-       struct device *dev = &client->dev;
-
-       sysfs_remove_group(&dev->kobj, &lm87_group);
-       sysfs_remove_group(&dev->kobj, &lm87_group_in6);
-       sysfs_remove_group(&dev->kobj, &lm87_group_fan1);
-       sysfs_remove_group(&dev->kobj, &lm87_group_in7);
-       sysfs_remove_group(&dev->kobj, &lm87_group_fan2);
-       sysfs_remove_group(&dev->kobj, &lm87_group_temp3);
-       sysfs_remove_group(&dev->kobj, &lm87_group_in0_5);
-       sysfs_remove_group(&dev->kobj, &lm87_group_vid);
+       struct i2c_client *client = arg;
+       struct lm87_data *data = i2c_get_clientdata(client);
+
+       lm87_write_value(client, LM87_REG_CONFIG, data->config);
 }
 
-static void lm87_init_client(struct i2c_client *client)
+static int lm87_init_client(struct i2c_client *client)
 {
        struct lm87_data *data = i2c_get_clientdata(client);
+       int rc;
 
        if (dev_get_platdata(&client->dev)) {
                data->channel = *(u8 *)dev_get_platdata(&client->dev);
@@ -868,6 +864,10 @@ static void lm87_init_client(struct i2c_client *client)
        }
        data->config = lm87_read_value(client, LM87_REG_CONFIG) & 0x6F;
 
+       rc = devm_add_action(&client->dev, lm87_restore_config, client);
+       if (rc)
+               return rc;
+
        if (!(data->config & 0x01)) {
                int i;
 
@@ -895,12 +895,15 @@ static void lm87_init_client(struct i2c_client *client)
        if ((data->config & 0x09) != 0x01)
                lm87_write_value(client, LM87_REG_CONFIG,
                                 (data->config & 0x77) | 0x01);
+       return 0;
 }
 
 static int lm87_probe(struct i2c_client *client, const struct i2c_device_id *id)
 {
        struct lm87_data *data;
+       struct device *hwmon_dev;
        int err;
+       unsigned int group_tail = 0;
 
        data = devm_kzalloc(&client->dev, sizeof(struct lm87_data), GFP_KERNEL);
        if (!data)
@@ -910,7 +913,9 @@ static int lm87_probe(struct i2c_client *client, const struct i2c_device_id *id)
        mutex_init(&data->update_lock);
 
        /* Initialize the LM87 chip */
-       lm87_init_client(client);
+       err = lm87_init_client(client);
+       if (err)
+               return err;
 
        data->in_scale[0] = 2500;
        data->in_scale[1] = 2700;
@@ -921,72 +926,34 @@ static int lm87_probe(struct i2c_client *client, const struct i2c_device_id *id)
        data->in_scale[6] = 1875;
        data->in_scale[7] = 1875;
 
-       /* Register sysfs hooks */
-       err = sysfs_create_group(&client->dev.kobj, &lm87_group);
-       if (err)
-               goto exit_stop;
-
-       if (data->channel & CHAN_NO_FAN(0)) {
-               err = sysfs_create_group(&client->dev.kobj, &lm87_group_in6);
-               if (err)
-                       goto exit_remove;
-       } else {
-               err = sysfs_create_group(&client->dev.kobj, &lm87_group_fan1);
-               if (err)
-                       goto exit_remove;
-       }
-
-       if (data->channel & CHAN_NO_FAN(1)) {
-               err = sysfs_create_group(&client->dev.kobj, &lm87_group_in7);
-               if (err)
-                       goto exit_remove;
-       } else {
-               err = sysfs_create_group(&client->dev.kobj, &lm87_group_fan2);
-               if (err)
-                       goto exit_remove;
-       }
-
-       if (data->channel & CHAN_TEMP3) {
-               err = sysfs_create_group(&client->dev.kobj, &lm87_group_temp3);
-               if (err)
-                       goto exit_remove;
-       } else {
-               err = sysfs_create_group(&client->dev.kobj, &lm87_group_in0_5);
-               if (err)
-                       goto exit_remove;
-       }
+       /*
+        * Construct the list of attributes, the list depends on the
+        * configuration of the chip
+        */
+       data->attr_groups[group_tail++] = &lm87_group;
+       if (data->channel & CHAN_NO_FAN(0))
+               data->attr_groups[group_tail++] = &lm87_group_in6;
+       else
+               data->attr_groups[group_tail++] = &lm87_group_fan1;
+
+       if (data->channel & CHAN_NO_FAN(1))
+               data->attr_groups[group_tail++] = &lm87_group_in7;
+       else
+               data->attr_groups[group_tail++] = &lm87_group_fan2;
+
+       if (data->channel & CHAN_TEMP3)
+               data->attr_groups[group_tail++] = &lm87_group_temp3;
+       else
+               data->attr_groups[group_tail++] = &lm87_group_in0_5;
 
        if (!(data->channel & CHAN_NO_VID)) {
                data->vrm = vid_which_vrm();
-               err = sysfs_create_group(&client->dev.kobj, &lm87_group_vid);
-               if (err)
-                       goto exit_remove;
-       }
-
-       data->hwmon_dev = hwmon_device_register(&client->dev);
-       if (IS_ERR(data->hwmon_dev)) {
-               err = PTR_ERR(data->hwmon_dev);
-               goto exit_remove;
+               data->attr_groups[group_tail++] = &lm87_group_vid;
        }
 
-       return 0;
-
-exit_remove:
-       lm87_remove_files(client);
-exit_stop:
-       lm87_write_value(client, LM87_REG_CONFIG, data->config);
-       return err;
-}
-
-static int lm87_remove(struct i2c_client *client)
-{
-       struct lm87_data *data = i2c_get_clientdata(client);
-
-       hwmon_device_unregister(data->hwmon_dev);
-       lm87_remove_files(client);
-
-       lm87_write_value(client, LM87_REG_CONFIG, data->config);
-       return 0;
+       hwmon_dev = devm_hwmon_device_register_with_groups(
+           &client->dev, client->name, client, data->attr_groups);
+       return PTR_ERR_OR_ZERO(hwmon_dev);
 }
 
 /*
@@ -1006,7 +973,6 @@ static struct i2c_driver lm87_driver = {
                .name   = "lm87",
        },
        .probe          = lm87_probe,
-       .remove         = lm87_remove,
        .id_table       = lm87_id,
        .detect         = lm87_detect,
        .address_list   = normal_i2c,