Re: [PATCH v5 1/2] pmbus: support for custom sysfs attributes

[Guenter Roeck <linux@roeck-us.net>]

On Mon, Apr 15, 2019 at 02:44:05PM -0700, Patrick Venture wrote:
> From: krzysztof.adamski@nokia.com
> 
> This patch makes it possible to pass custom struct attribute_group array
> via the pmbus_driver_info struct so that those can be added to the
> attribute groups passed to hwmon_device_register_with_groups().
> 
> This makes it possible to register custom sysfs attributes by PMBUS
> drivers similar to how you can do this with most other busses/classes.
> 
> Signed-off-by: Krzysztof Adamski <krzysztof.adamski@nokia.com>

Applied to hwmon-next.

Guenter

> ---
> V5:
>  None
> v4:
>  None
> v3:
>  - staged before v3 hwmon/pmbus/isl68137 driver
> ---
>  drivers/hwmon/pmbus/pmbus.h      |  3 +++
>  drivers/hwmon/pmbus/pmbus_core.c | 13 ++++++++++++-
>  2 files changed, 15 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/hwmon/pmbus/pmbus.h b/drivers/hwmon/pmbus/pmbus.h
> index 1d24397d36ecd..fb267ec116235 100644
> --- a/drivers/hwmon/pmbus/pmbus.h
> +++ b/drivers/hwmon/pmbus/pmbus.h
> @@ -417,6 +417,9 @@ struct pmbus_driver_info {
>  	/* Regulator functionality, if supported by this chip driver. */
>  	int num_regulators;
>  	const struct regulator_desc *reg_desc;
> +
> +	/* custom attributes */
> +	const struct attribute_group **groups;
>  };
>  
>  /* Regulator ops */
> diff --git a/drivers/hwmon/pmbus/pmbus_core.c b/drivers/hwmon/pmbus/pmbus_core.c
> index e2366428a9a91..d6170a802c0f7 100644
> --- a/drivers/hwmon/pmbus/pmbus_core.c
> +++ b/drivers/hwmon/pmbus/pmbus_core.c
> @@ -103,7 +103,7 @@ struct pmbus_data {
>  	int max_attributes;
>  	int num_attributes;
>  	struct attribute_group group;
> -	const struct attribute_group *groups[2];
> +	const struct attribute_group **groups;
>  	struct dentry *debugfs;		/* debugfs device directory */
>  
>  	struct pmbus_sensor *sensors;
> @@ -2305,6 +2305,7 @@ int pmbus_do_probe(struct i2c_client *client, const struct i2c_device_id *id,
>  	struct device *dev = &client->dev;
>  	const struct pmbus_platform_data *pdata = dev_get_platdata(dev);
>  	struct pmbus_data *data;
> +	size_t groups_num = 0;
>  	int ret;
>  
>  	if (!info)
> @@ -2319,6 +2320,15 @@ int pmbus_do_probe(struct i2c_client *client, const struct i2c_device_id *id,
>  	if (!data)
>  		return -ENOMEM;
>  
> +	if (info->groups)
> +		while (info->groups[groups_num])
> +			groups_num++;
> +
> +	data->groups = devm_kcalloc(dev, groups_num + 2, sizeof(void *),
> +				    GFP_KERNEL);
> +	if (!data->groups)
> +		return -ENOMEM;
> +
>  	i2c_set_clientdata(client, data);
>  	mutex_init(&data->update_lock);
>  	data->dev = dev;
> @@ -2346,6 +2356,7 @@ int pmbus_do_probe(struct i2c_client *client, const struct i2c_device_id *id,
>  	}
>  
>  	data->groups[0] = &data->group;
> +	memcpy(data->groups + 1, info->groups, sizeof(void *) * groups_num);
>  	data->hwmon_dev = hwmon_device_register_with_groups(dev, client->name,
>  							    data, data->groups);
>  	if (IS_ERR(data->hwmon_dev)) {