[PATCH 02/11] hwmon: (max6642) Convert to use devm_hwmon_device_register_with_groups

Guenter Roeck
2013-09-14T17:16:41Z

Also rename new_client variable to client and introduce
new variable dev pointing to client->dev in the probe function,
and use new macro ATTRIBUTE_GROUPS to declare attribute groups.

Signed-off-by: Guenter Roeck <linux@roeck-us.net>
---
drivers/hwmon/max6642.c | 72 ++++++++++++++++-------------------------------
1 file changed, 24 insertions(+), 48 deletions(-)

diff --git a/drivers/hwmon/max6642.c b/drivers/hwmon/max6642.c
index 57d58cd..3d61f8d 100644
--- a/drivers/hwmon/max6642.c
+++ b/drivers/hwmon/max6642.c
@@ -87,7 +87,7 @@ static int temp_to_reg(int val)
*/

struct max6642_data {
- struct device *hwmon_dev;
+ struct i2c_client *client;
struct mutex update_lock;
bool valid; /* zero until following fields are valid */
unsigned long last_updated; /* in jiffies */
@@ -102,10 +102,10 @@ struct max6642_data {
* Real code
*/

-static void max6642_init_client(struct i2c_client *client)
+static void max6642_init_client(struct max6642_data *data,
+ struct i2c_client *client)
{
u8 config;
- struct max6642_data *data = i2c_get_clientdata(client);

/*
* Start the conversions.
@@ -168,14 +168,14 @@ static int max6642_detect(struct i2c_client *client,

static struct max6642_data *max6642_update_device(struct device *dev)
{
- struct i2c_client *client = to_i2c_client(dev);
- struct max6642_data *data = i2c_get_clientdata(client);
+ struct max6642_data *data = dev_get_drvdata(dev);
+ struct i2c_client *client = data->client;
u16 val, tmp;

mutex_lock(&data->update_lock);

if (time_after(jiffies, data->last_updated + HZ) || !data->valid) {
- dev_dbg(&client->dev, "Updating max6642 data.\n");
+ dev_dbg(dev, "Updating max6642 data.\n");
val = i2c_smbus_read_byte_data(client,
MAX6642_REG_R_LOCAL_TEMPL);
tmp = (val >> 6) & 3;
@@ -209,8 +209,8 @@ static struct max6642_data *max6642_update_device(struct device *dev)
static ssize_t show_temp_max10(struct device *dev,
struct device_attribute *dev_attr, char *buf)
{
- struct max6642_data *data = max6642_update_device(dev);
struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr);
+ struct max6642_data *data = max6642_update_device(dev);

return sprintf(buf, "%d\n",
temp_from_reg10(data->temp_input[attr->index]));
@@ -219,8 +219,8 @@ static ssize_t show_temp_max10(struct device *dev,
static ssize_t show_temp_max(struct device *dev, struct device_attribute *attr,
char *buf)
{
- struct max6642_data *data = max6642_update_device(dev);
struct sensor_device_attribute_2 *attr2 = to_sensor_dev_attr_2(attr);
+ struct max6642_data *data = max6642_update_device(dev);

return sprintf(buf, "%d\n", temp_from_reg(data->temp_high[attr2->nr]));
}
@@ -228,11 +228,10 @@ static ssize_t show_temp_max(struct device *dev, struct device_attribute *attr,
static ssize_t set_temp_max(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
+ struct sensor_device_attribute_2 *attr2 = to_sensor_dev_attr_2(attr);
+ struct max6642_data *data = dev_get_drvdata(dev);
unsigned long val;
int err;
- struct i2c_client *client = to_i2c_client(dev);
- struct max6642_data *data = i2c_get_clientdata(client);
- struct sensor_device_attribute_2 *attr2 = to_sensor_dev_attr_2(attr);

err = kstrtoul(buf, 10, &val);
if (err < 0)
@@ -240,7 +239,7 @@ static ssize_t set_temp_max(struct device *dev, struct device_attribute *attr,

mutex_lock(&data->update_lock);
data->temp_high[attr2->nr] = clamp_val(temp_to_reg(val), 0, 255);
- i2c_smbus_write_byte_data(client, attr2->index,
+ i2c_smbus_write_byte_data(data->client, attr2->index,
data->temp_high[attr2->nr]);
mutex_unlock(&data->update_lock);
return count;
@@ -264,7 +263,7 @@ static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_alarm, NULL, 2);
static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, show_alarm, NULL, 6);
static SENSOR_DEVICE_ATTR(temp2_max_alarm, S_IRUGO, show_alarm, NULL, 4);

-static struct attribute *max6642_attributes[] = {
+static struct attribute *max6642_attrs[] = {
&sensor_dev_attr_temp1_input.dev_attr.attr,
&sensor_dev_attr_temp2_input.dev_attr.attr,
&sensor_dev_attr_temp1_max.dev_attr.attr,
@@ -275,52 +274,30 @@ static struct attribute *max6642_attributes[] = {
&sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
NULL
};
+ATTRIBUTE_GROUPS(max6642);

-static const struct attribute_group max6642_group = {
- .attrs = max6642_attributes,
-};
-
-static int max6642_probe(struct i2c_client *new_client,
+static int max6642_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
+ struct device *dev = &client->dev;
struct max6642_data *data;
- int err;
+ struct device *hwmon_dev;

- data = devm_kzalloc(&new_client->dev, sizeof(struct max6642_data),
- GFP_KERNEL);
+ data = devm_kzalloc(dev, sizeof(struct max6642_data), GFP_KERNEL);
if (!data)
return -ENOMEM;

- i2c_set_clientdata(new_client, data);
+ data->client = client;
mutex_init(&data->update_lock);

/* Initialize the MAX6642 chip */
- max6642_init_client(new_client);
-
- /* Register sysfs hooks */
- err = sysfs_create_group(&new_client->dev.kobj, &max6642_group);
- if (err)
- return err;
-
- data->hwmon_dev = hwmon_device_register(&new_client->dev);
- if (IS_ERR(data->hwmon_dev)) {
- err = PTR_ERR(data->hwmon_dev);
- goto exit_remove_files;
- }
-
- return 0;
-
-exit_remove_files:
- sysfs_remove_group(&new_client->dev.kobj, &max6642_group);
- return err;
-}
-
-static int max6642_remove(struct i2c_client *client)
-{
- struct max6642_data *data = i2c_get_clientdata(client);
+ max6642_init_client(data, client);

- hwmon_device_unregister(data->hwmon_dev);
- sysfs_remove_group(&client->dev.kobj, &max6642_group);
+ hwmon_dev = devm_hwmon_device_register_with_groups(&client->dev,
+ client->name, data,
+ max6642_groups);
+ if (IS_ERR(hwmon_dev))
+ return PTR_ERR(hwmon_dev);

return 0;
}
@@ -341,7 +318,6 @@ static struct i2c_driver max6642_driver = {
.name = "max6642",
},
.probe = max6642_probe,
- .remove = max6642_remove,
.id_table = max6642_id,
.detect = max6642_detect,
.address_list = normal_i2c,
--
1.7.9.7