linux-kernel - Re: [PATCH] hwmon: pwm-fan: Add pwm-fan driver

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Date:	Wed, 9 Jul 2014 19:49:39 +0200
From:	Tobias Klauser <tklauser@...tanz.ch>
To:	Kamil Debski <k.debski@...sung.com>
Cc:	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	lm-sensors@...sensors.org, t.figa@...sung.com,
	m.szyprowski@...sung.com
Subject: Re: [PATCH] hwmon: pwm-fan: Add pwm-fan driver

On 2014-07-09 at 16:53:20 +0200, Kamil Debski <k.debski@...sung.com> wrote:
> The pwm-fan driver enables control of fans connected to PWM lines.
> This driver uses the PWM framework, so it is compatible with all
> PWM devices that provide drivers through the PWM framework.
> 
> Signed-off-by: Kamil Debski <k.debski@...sung.com>
> ---
>  .../devicetree/bindings/hwmon/pwm-fan.txt          |   12 ++
>  drivers/hwmon/Kconfig                              |    9 +
>  drivers/hwmon/Makefile                             |    1 +
>  drivers/hwmon/pwm-fan.c                            |  199 ++++++++++++++++++++
>  4 files changed, 221 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/hwmon/pwm-fan.txt
>  create mode 100644 drivers/hwmon/pwm-fan.c

[...]

> diff --git a/drivers/hwmon/pwm-fan.c b/drivers/hwmon/pwm-fan.c
> new file mode 100644
> index 0000000..78fa627
> --- /dev/null
> +++ b/drivers/hwmon/pwm-fan.c
> @@ -0,0 +1,199 @@

[...]

> +#ifdef CONFIG_PM_SLEEP
> +static int pwm_fan_suspend(struct device *dev)
> +{
> +	struct pwm_fan_ctx *ctx = dev_get_drvdata(dev);
> +
> +	return pwm_config(ctx->pwm, 0, ctx->pwm->period);
> +}
> +
> +static int pwm_fan_resume(struct device *dev)
> +{
> +	struct pwm_fan_ctx *ctx = dev_get_drvdata(dev);
> +
> +	return pwm_config(ctx->pwm, ctx->duty_cycle, ctx->pwm->period);
> +}
> +
> +static SIMPLE_DEV_PM_OPS(pwm_fan_pm, pwm_fan_suspend, pwm_fan_resume);

If you move this out of #ifdef CONFIG_PM_SLEEP, you won't need the
#ifdef around driver.pm below [1]. SIMPLE_DEV_PM_OPS will just define an
empty struct dev_pm_os if CONFIG_PM_LSEEP is not defined.

> +#endif
> +
> +
> +
> +static struct of_device_id of_pwm_fan_match[] = {
> +	{ .compatible = "pwm-fan", },
> +	{},
> +};
> +
> +static struct platform_driver pwm_fan_driver = {
> +	.probe		= pwm_fan_probe,
> +	.remove		= pwm_fan_remove,
> +	.driver	= {
> +		.name		= "pwm-fan",
> +#ifdef CONFIG_PM_SLEEP
> +		.pm		= &pwm_fan_pm,
> +#endif

[1] #ifdef CONFIG_PM_SLEEP not needed with the above change.

> +		.of_match_table	= of_match_ptr(of_pwm_fan_match),
> +	},
> +};
> +
> +module_platform_driver(pwm_fan_driver);
> +
> +MODULE_AUTHOR("Kamil Debski <k.debski@...sung.com>");
> +MODULE_ALIAS("platform:pwm-fan");
> +MODULE_DESCRIPTION("PWM FAN driver");
> +MODULE_LICENSE("GPL");
> -- 
> 1.7.9.5
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