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Date: Sat, 20 Jul 2019 07:23:57 -0700
From: Guenter Roeck <linux@...ck-us.net>
To: Grant McEwan <grant.mcewan@...iedtelesis.co.nz>
Cc: jdelvare@...e.com, linux-hwmon@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH] hwmon: (adt7475) Convert to use
hwmon_device_register_with_groups()
On Fri, Jul 19, 2019 at 01:41:30PM +1200, Grant McEwan wrote:
> hwmon_device_register() is a deprecated function and produces a warning.
>
> Converting the driver to use the hwmon_device_register_with_groups()
> instead.
>
> Signed-off-by: Grant McEwan <grant.mcewan@...iedtelesis.co.nz>
> ---
> drivers/hwmon/adt7475.c | 104 +++++++++++++++++++---------------------
> 1 file changed, 48 insertions(+), 56 deletions(-)
>
> diff --git a/drivers/hwmon/adt7475.c b/drivers/hwmon/adt7475.c
> index c3c6031a7285..4e838555102f 100644
> --- a/drivers/hwmon/adt7475.c
> +++ b/drivers/hwmon/adt7475.c
> @@ -188,6 +188,7 @@ MODULE_DEVICE_TABLE(of, adt7475_of_match);
>
> struct adt7475_data {
> struct device *hwmon_dev;
> + struct i2c_client *client;
> struct mutex lock;
>
> unsigned long measure_updated;
> @@ -212,6 +213,7 @@ struct adt7475_data {
>
> u8 vid;
> u8 vrm;
> + const struct attribute_group *groups[8];
There are a total of 8 groups, and the list of groups needs to be
terminated with a NULL pointer, so there have to be 9 entries in
this array.
> };
>
> static struct i2c_driver adt7475_driver;
> @@ -346,8 +348,8 @@ static ssize_t voltage_store(struct device *dev,
> {
>
> struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
> - struct i2c_client *client = to_i2c_client(dev);
> - struct adt7475_data *data = i2c_get_clientdata(client);
> + struct adt7475_data *data = dev_get_drvdata(dev);
> + struct i2c_client *client = data->client;
> unsigned char reg;
> long val;
>
> @@ -440,8 +442,8 @@ static ssize_t temp_store(struct device *dev, struct device_attribute *attr,
> const char *buf, size_t count)
> {
> struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
> - struct i2c_client *client = to_i2c_client(dev);
> - struct adt7475_data *data = i2c_get_clientdata(client);
> + struct adt7475_data *data = dev_get_drvdata(dev);
> + struct i2c_client *client = data->client;
> unsigned char reg = 0;
> u8 out;
> int temp;
> @@ -542,8 +544,7 @@ static ssize_t temp_st_show(struct device *dev, struct device_attribute *attr,
> char *buf)
> {
> struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
> - struct i2c_client *client = to_i2c_client(dev);
> - struct adt7475_data *data = i2c_get_clientdata(client);
> + struct adt7475_data *data = dev_get_drvdata(dev);
> long val;
>
> switch (sattr->index) {
> @@ -570,8 +571,8 @@ static ssize_t temp_st_store(struct device *dev,
> size_t count)
> {
> struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
> - struct i2c_client *client = to_i2c_client(dev);
> - struct adt7475_data *data = i2c_get_clientdata(client);
> + struct adt7475_data *data = dev_get_drvdata(dev);
> + struct i2c_client *client = data->client;
> unsigned char reg;
> int shift, idx;
> ulong val;
> @@ -647,8 +648,8 @@ static ssize_t point2_show(struct device *dev, struct device_attribute *attr,
> static ssize_t point2_store(struct device *dev, struct device_attribute *attr,
> const char *buf, size_t count)
> {
> - struct i2c_client *client = to_i2c_client(dev);
> - struct adt7475_data *data = i2c_get_clientdata(client);
> + struct adt7475_data *data = dev_get_drvdata(dev);
> + struct i2c_client *client = data->client;
> struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
> int temp;
> long val;
> @@ -710,8 +711,8 @@ static ssize_t tach_store(struct device *dev, struct device_attribute *attr,
> {
>
> struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
> - struct i2c_client *client = to_i2c_client(dev);
> - struct adt7475_data *data = i2c_get_clientdata(client);
> + struct adt7475_data *data = dev_get_drvdata(dev);
> + struct i2c_client *client = data->client;
> unsigned long val;
>
> if (kstrtoul(buf, 10, &val))
> @@ -769,8 +770,8 @@ static ssize_t pwm_store(struct device *dev, struct device_attribute *attr,
> {
>
> struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
> - struct i2c_client *client = to_i2c_client(dev);
> - struct adt7475_data *data = i2c_get_clientdata(client);
> + struct adt7475_data *data = dev_get_drvdata(dev);
> + struct i2c_client *client = data->client;
> unsigned char reg = 0;
> long val;
>
> @@ -818,8 +819,8 @@ static ssize_t stall_disable_show(struct device *dev,
> struct device_attribute *attr, char *buf)
> {
> struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
> - struct i2c_client *client = to_i2c_client(dev);
> - struct adt7475_data *data = i2c_get_clientdata(client);
> + struct adt7475_data *data = dev_get_drvdata(dev);
> +
> u8 mask = BIT(5 + sattr->index);
>
> return sprintf(buf, "%d\n", !!(data->enh_acoustics[0] & mask));
> @@ -830,8 +831,8 @@ static ssize_t stall_disable_store(struct device *dev,
> const char *buf, size_t count)
> {
> struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
> - struct i2c_client *client = to_i2c_client(dev);
> - struct adt7475_data *data = i2c_get_clientdata(client);
> + struct adt7475_data *data = dev_get_drvdata(dev);
> + struct i2c_client *client = data->client;
> long val;
> u8 mask = BIT(5 + sattr->index);
>
> @@ -914,8 +915,8 @@ static ssize_t pwmchan_store(struct device *dev,
> size_t count)
> {
> struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
> - struct i2c_client *client = to_i2c_client(dev);
> - struct adt7475_data *data = i2c_get_clientdata(client);
> + struct adt7475_data *data = dev_get_drvdata(dev);
> + struct i2c_client *client = data->client;
> int r;
> long val;
>
> @@ -938,8 +939,8 @@ static ssize_t pwmctrl_store(struct device *dev,
> size_t count)
> {
> struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
> - struct i2c_client *client = to_i2c_client(dev);
> - struct adt7475_data *data = i2c_get_clientdata(client);
> + struct adt7475_data *data = dev_get_drvdata(dev);
> + struct i2c_client *client = data->client;
> int r;
> long val;
>
> @@ -982,8 +983,8 @@ static ssize_t pwmfreq_store(struct device *dev,
> size_t count)
> {
> struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
> - struct i2c_client *client = to_i2c_client(dev);
> - struct adt7475_data *data = i2c_get_clientdata(client);
> + struct adt7475_data *data = dev_get_drvdata(dev);
> + struct i2c_client *client = data->client;
> int out;
> long val;
>
> @@ -1022,8 +1023,8 @@ static ssize_t pwm_use_point2_pwm_at_crit_store(struct device *dev,
> struct device_attribute *devattr,
> const char *buf, size_t count)
> {
> - struct i2c_client *client = to_i2c_client(dev);
> - struct adt7475_data *data = i2c_get_clientdata(client);
> + struct adt7475_data *data = dev_get_drvdata(dev);
> + struct i2c_client *client = data->client;
> long val;
>
> if (kstrtol(buf, 10, &val))
> @@ -1305,6 +1306,9 @@ static const struct attribute_group in4_attr_group = { .attrs = in4_attrs };
> static const struct attribute_group in5_attr_group = { .attrs = in5_attrs };
> static const struct attribute_group vid_attr_group = { .attrs = vid_attrs };
>
> +/* Number of possible attribute groups to add into sysfs */
> +#define ATTR_GROUP_COUNT 8
> +
Not used anywhere.
> static int adt7475_detect(struct i2c_client *client,
> struct i2c_board_info *info)
> {
> @@ -1489,7 +1493,7 @@ static int adt7475_probe(struct i2c_client *client,
> };
>
> struct adt7475_data *data;
> - int i, ret = 0, revision;
> + int i, ret = 0, revision, group_num = 0;
> u8 config2, config3;
>
> data = devm_kzalloc(&client->dev, sizeof(*data), GFP_KERNEL);
> @@ -1497,6 +1501,7 @@ static int adt7475_probe(struct i2c_client *client,
> return -ENOMEM;
>
> mutex_init(&data->lock);
> + data->client = client;
> i2c_set_clientdata(client, data);
>
> if (client->dev.of_node)
> @@ -1590,49 +1595,37 @@ static int adt7475_probe(struct i2c_client *client,
> break;
> }
>
> - ret = sysfs_create_group(&client->dev.kobj, &adt7475_attr_group);
> - if (ret)
> - return ret;
> + data->groups[group_num++] = &adt7475_attr_group;
>
> /* Features that can be disabled individually */
> if (data->has_fan4) {
> - ret = sysfs_create_group(&client->dev.kobj, &fan4_attr_group);
> - if (ret)
> - goto eremove;
> + data->groups[group_num++] = &fan4_attr_group;
> }
> if (data->has_pwm2) {
> - ret = sysfs_create_group(&client->dev.kobj, &pwm2_attr_group);
> - if (ret)
> - goto eremove;
> + data->groups[group_num++] = &pwm2_attr_group;
> }
> if (data->has_voltage & (1 << 0)) {
> - ret = sysfs_create_group(&client->dev.kobj, &in0_attr_group);
> - if (ret)
> - goto eremove;
> + data->groups[group_num++] = &in0_attr_group;
> }
> if (data->has_voltage & (1 << 3)) {
> - ret = sysfs_create_group(&client->dev.kobj, &in3_attr_group);
> - if (ret)
> - goto eremove;
> + data->groups[group_num++] = &in3_attr_group;
> }
> if (data->has_voltage & (1 << 4)) {
> - ret = sysfs_create_group(&client->dev.kobj, &in4_attr_group);
> - if (ret)
> - goto eremove;
> + data->groups[group_num++] = &in4_attr_group;
> }
> if (data->has_voltage & (1 << 5)) {
> - ret = sysfs_create_group(&client->dev.kobj, &in5_attr_group);
> - if (ret)
> - goto eremove;
> + data->groups[group_num++] = &in5_attr_group;
> }
> if (data->has_vid) {
> data->vrm = vid_which_vrm();
> - ret = sysfs_create_group(&client->dev.kobj, &vid_attr_group);
> - if (ret)
> - goto eremove;
> + data->groups[group_num] = &vid_attr_group;
> }
>
> - data->hwmon_dev = hwmon_device_register(&client->dev);
> + /* register device with all the acquired attributes */
> + data->hwmon_dev = hwmon_device_register_with_groups(&client->dev,
> + client->name, data,
> + data->groups);
> +
You could call devm_hwmon_device_register_with_groups() here, drop the
remove function, and drop hwmon_dev from struct adt7475_data.
Also, adt7475_remove_files() is no longer necessary. With the new API,
attribute files are owned by the hwmon subsystem.
> if (IS_ERR(data->hwmon_dev)) {
> ret = PTR_ERR(data->hwmon_dev);
> goto eremove;
> @@ -1757,8 +1750,8 @@ static void adt7475_read_pwm(struct i2c_client *client, int index)
>
> static int adt7475_update_measure(struct device *dev)
> {
> - struct i2c_client *client = to_i2c_client(dev);
> - struct adt7475_data *data = i2c_get_clientdata(client);
> + struct adt7475_data *data = dev_get_drvdata(dev);
> + struct i2c_client *client = data->client;
> u16 ext;
> int i;
> int ret;
> @@ -1854,8 +1847,7 @@ static int adt7475_update_measure(struct device *dev)
>
> static struct adt7475_data *adt7475_update_device(struct device *dev)
> {
> - struct i2c_client *client = to_i2c_client(dev);
> - struct adt7475_data *data = i2c_get_clientdata(client);
> + struct adt7475_data *data = dev_get_drvdata(dev);
> int ret;
>
> mutex_lock(&data->lock);
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