[PATCH v3 1/4] hwmon: (lm75) Handle cleanup with devm_add_action

From: Guenter Roeck
Date: Thu Jun 30 2016 - 02:45:35 EST


Use devm_add_action() to register the function to restore the original
chip configuration. Use devm_hwmon_device_register_with_groups()
to register the hwmon device, and drop the remove function as no
longer needed.

Signed-off-by: Guenter Roeck <linux@xxxxxxxxxxxx>
---
v2, v3: No change

drivers/hwmon/lm75.c | 38 +++++++++++++++++++-------------------
1 file changed, 19 insertions(+), 19 deletions(-)

diff --git a/drivers/hwmon/lm75.c b/drivers/hwmon/lm75.c
index 69166ab3151d..0df745501a1f 100644
--- a/drivers/hwmon/lm75.c
+++ b/drivers/hwmon/lm75.c
@@ -76,7 +76,6 @@ static const u8 LM75_REG_TEMP[3] = {
/* Each client has this additional data */
struct lm75_data {
struct i2c_client *client;
- struct device *hwmon_dev;
struct mutex update_lock;
u8 orig_conf;
u8 resolution; /* In bits, between 9 and 12 */
@@ -185,10 +184,19 @@ static const struct thermal_zone_of_device_ops lm75_of_thermal_ops = {

/* device probe and removal */

+static void lm75_remove(void *data)
+{
+ struct lm75_data *lm75 = data;
+ struct i2c_client *client = lm75->client;
+
+ i2c_smbus_write_byte_data(client, LM75_REG_CONF, lm75->orig_conf);
+}
+
static int
lm75_probe(struct i2c_client *client, const struct i2c_device_id *id)
{
struct device *dev = &client->dev;
+ struct device *hwmon_dev;
struct lm75_data *data;
int status;
u8 set_mask, clr_mask;
@@ -298,29 +306,22 @@ lm75_probe(struct i2c_client *client, const struct i2c_device_id *id)
new |= set_mask;
if (status != new)
lm75_write_value(client, LM75_REG_CONF, new);
- dev_dbg(dev, "Config %02x\n", new);

- data->hwmon_dev = hwmon_device_register_with_groups(dev, client->name,
- data, lm75_groups);
- if (IS_ERR(data->hwmon_dev))
- return PTR_ERR(data->hwmon_dev);
+ devm_add_action(dev, lm75_remove, data);

- devm_thermal_zone_of_sensor_register(data->hwmon_dev, 0,
- data->hwmon_dev,
- &lm75_of_thermal_ops);
+ dev_dbg(dev, "Config %02x\n", new);

- dev_info(dev, "%s: sensor '%s'\n",
- dev_name(data->hwmon_dev), client->name);
+ hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
+ data, lm75_groups);
+ if (IS_ERR(hwmon_dev))
+ return PTR_ERR(hwmon_dev);

- return 0;
-}
+ devm_thermal_zone_of_sensor_register(hwmon_dev, 0,
+ hwmon_dev,
+ &lm75_of_thermal_ops);

-static int lm75_remove(struct i2c_client *client)
-{
- struct lm75_data *data = i2c_get_clientdata(client);
+ dev_info(dev, "%s: sensor '%s'\n", dev_name(hwmon_dev), client->name);

- hwmon_device_unregister(data->hwmon_dev);
- lm75_write_value(client, LM75_REG_CONF, data->orig_conf);
return 0;
}

@@ -489,7 +490,6 @@ static struct i2c_driver lm75_driver = {
.pm = LM75_DEV_PM_OPS,
},
.probe = lm75_probe,
- .remove = lm75_remove,
.id_table = lm75_ids,
.detect = lm75_detect,
.address_list = normal_i2c,
--
2.5.0