linux-kernel - Re: [PATCH 1/2] hwmon: (pmbus): Export pmbus device debugfs directory entry

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Message-ID: <20171207204234.GA7736@roeck-us.net>
Date:   Thu, 7 Dec 2017 12:42:34 -0800
From:   Guenter Roeck <linux@...ck-us.net>
To:     Eddie James <eajames@...ux.vnet.ibm.com>
Cc:     linux-hwmon@...r.kernel.org, linux-kernel@...r.kernel.org,
        jdelvare@...e.com, mspinler@...ux.vnet.ibm.com, joel@....id.au,
        "Edward A. James" <eajames@...ibm.com>
Subject: Re: [PATCH 1/2] hwmon: (pmbus): Export pmbus device debugfs
 directory entry

On Thu, Dec 07, 2017 at 01:50:37PM -0600, Eddie James wrote:
> From: "Edward A. James" <eajames@...ibm.com>
> 
> Pmbus client drivers, if they want to use debugfs, should use the same
> root directory as the pmbus debugfs entries are using. Therefore, export
> the device dentry for the pmbus client.
> 
> Signed-off-by: Edward A. James <eajames@...ibm.com>
> ---
>  drivers/hwmon/pmbus/pmbus.h      | 2 ++
>  drivers/hwmon/pmbus/pmbus_core.c | 7 +++++++
>  2 files changed, 9 insertions(+)
> 
> diff --git a/drivers/hwmon/pmbus/pmbus.h b/drivers/hwmon/pmbus/pmbus.h
> index d39d506..1d24397 100644
> --- a/drivers/hwmon/pmbus/pmbus.h
> +++ b/drivers/hwmon/pmbus/pmbus.h
> @@ -461,4 +461,6 @@ int pmbus_get_fan_rate_cached(struct i2c_client *client, int page, int id,
>  			      enum pmbus_fan_mode mode);
>  int pmbus_update_fan(struct i2c_client *client, int page, int id,
>  		     u8 config, u8 mask, u16 command);
> +struct dentry *pmbus_get_debugfs_dir(struct i2c_client *client);
> +
>  #endif /* PMBUS_H */
> diff --git a/drivers/hwmon/pmbus/pmbus_core.c b/drivers/hwmon/pmbus/pmbus_core.c
> index 99ab39f..9abd382 100644
> --- a/drivers/hwmon/pmbus/pmbus_core.c
> +++ b/drivers/hwmon/pmbus/pmbus_core.c
> @@ -2381,6 +2381,13 @@ int pmbus_do_remove(struct i2c_client *client)
>  }
>  EXPORT_SYMBOL_GPL(pmbus_do_remove);
>  
> +struct dentry *pmbus_get_debugfs_dir(struct i2c_client *client)
> +{
> +	struct pmbus_data *data = i2c_get_clientdata(client);
> +
> +	return data->debugfs;
> +}
EXPORT_SYMBOL_GPL(pmbus_get_debugfs_dir);

> +
>  static int __init pmbus_core_init(void)
>  {
>  	pmbus_debugfs_dir = debugfs_create_dir("pmbus", NULL);
> -- 
> 1.8.3.1
> 
> --
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