linux-kernel - Re: [PATCH v6 6/6] hwmon: pwm-fan: Code for using PWM FAN as a cooling device

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Date:	Thu, 26 Feb 2015 06:12:36 -0800
From:	Guenter Roeck <linux@...ck-us.net>
To:	Lukasz Majewski <l.majewski@...sung.com>,
	Eduardo Valentin <edubezval@...il.com>,
	Kamil Debski <k.debski@...sung.com>,
	Jean Delvare <jdelvare@...e.de>, Kukjin Kim <kgene@...nel.org>
CC:	lm-sensors@...sensors.org,
	Linux PM list <linux-pm@...r.kernel.org>,
	"linux-samsung-soc@...r.kernel.org" 
	<linux-samsung-soc@...r.kernel.org>, devicetree@...r.kernel.org,
	Lukasz Majewski <l.majewski@...ess.pl>,
	Kukjin Kim <kgene.kim@...sung.com>,
	linux-kernel@...r.kernel.org,
	Sjoerd Simons <sjoerd.simons@...labora.co.uk>,
	Abhilash Kesavan <kesavan.abhilash@...il.com>,
	Abhilash Kesavan <a.kesavan@...sung.com>
Subject: Re: [PATCH v6 6/6] hwmon: pwm-fan: Code for using PWM FAN as a cooling
 device

On 02/26/2015 05:59 AM, Lukasz Majewski wrote:
> The PWM FAN device can now be used as a thermal cooling device. Necessary
> infrastructure has been added in this commit.
>
> Signed-off-by: Lukasz Majewski <l.majewski@...sung.com>
> Acked-by: Eduardo Valentin <edubezval@...il.com>
> ---
> Changes for v2:
> - Replace pwm_fan_cooling_states with pwm_fan_cooling_levels
> - Update ctx->pwm_fan_state when correct data from device tree is available
> - Using therma_cdev_update() when thermal is ready for controlling the fan
> Changes for v3:
> - Rename patch heading
> - pwm_fan_of_get_cooling_data() now returns -EINVAL when no "cooling-levels"
>    property defined
> - register of cooling device only when proper cooling data is present
> Changes for v4:
> - None
> Changes for v5:
> - Check for IS_ENABLED(CONFIG_THERMAL) has been added to prevent from
>    executing thermal_* specific functions
> Changes for v6:
> - Adding missing ctx == NULL check in pwm_fan_get_max_state()
> - Call to thermal_cooling_device_unregister(ctx->cdev); at pwm_fan_remove()
> - struct thermal_cooling_device *cdev; added to struct pwm_fan_ctx
> ---
>   drivers/hwmon/pwm-fan.c | 89 ++++++++++++++++++++++++++++++++++++++++++++++++-
>   1 file changed, 88 insertions(+), 1 deletion(-)
[ ... ]
>
> @@ -200,6 +286,7 @@ static int pwm_fan_remove(struct platform_device *pdev)
>   {
>   	struct pwm_fan_ctx *ctx = platform_get_drvdata(pdev);
>
> +	thermal_cooling_device_unregister(ctx->cdev);

Unfortunately there is still no prototype for this if CONFIG_THERMAL
is not configured.

Two options: Yet another revision, or wait a week until the prototypes
are (hopefully) available and submit a patch without the conditionals.

Guenter

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