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SubjectRe: [RFC PATCH 3/5] hwmon: (ds1621) Convert to use hwmon_device_register_groups
On Sat, Jul 06, 2013 at 10:24:53AM -0700, Guenter Roeck wrote:
> Signed-off-by: Guenter Roeck <linux@roeck-us.net>
> ---
> drivers/hwmon/ds1621.c | 25 +++++++++----------------
> 1 file changed, 9 insertions(+), 16 deletions(-)
>
> diff --git a/drivers/hwmon/ds1621.c b/drivers/hwmon/ds1621.c
> index a26ba7a..f1d0fa0 100644
> --- a/drivers/hwmon/ds1621.c
> +++ b/drivers/hwmon/ds1621.c
> @@ -358,11 +358,15 @@ static const struct attribute_group ds1621_group = {
> .is_visible = ds1621_attribute_visible
> };
>
> +static const struct attribute_group *ds1621_groups[] = {
> + &ds1621_group,
> + NULL
> +};
> +
> static int ds1621_probe(struct i2c_client *client,
> const struct i2c_device_id *id)
> {
> struct ds1621_data *data;
> - int err;
>
> data = devm_kzalloc(&client->dev, sizeof(struct ds1621_data),
> GFP_KERNEL);
> @@ -377,22 +381,12 @@ static int ds1621_probe(struct i2c_client *client,
> /* Initialize the DS1621 chip */
> ds1621_init_client(client);
>
> - /* Register sysfs hooks */
> - err = sysfs_create_group(&client->dev.kobj, &ds1621_group);
> - if (err)
> - return err;
> -
> - data->hwmon_dev = hwmon_device_register(&client->dev);
> - if (IS_ERR(data->hwmon_dev)) {
> - err = PTR_ERR(data->hwmon_dev);
> - goto exit_remove_files;
> - }
> + data->hwmon_dev = hwmon_device_register_groups(&client->dev, data,
> + ds1621_groups);
> + if (IS_ERR(data->hwmon_dev))
> + return PTR_ERR(data->hwmon_dev);
>
> return 0;
> -
> - exit_remove_files:
> - sysfs_remove_group(&client->dev.kobj, &ds1621_group);
> - return err;

Aren't your sysfs files now being created attached to a different device
than they originally were? Before this patch, they were being attached
to the parent device of the hwmon device being created with the call to
hwmon_device_register(), and now they are attached to the device created
with that call.

Is that what you really want? Can userspace handle this movement of
files?

thanks,

greg k-h


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