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

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Date:	Thu, 10 Jul 2014 17:19:36 +0200
From:	Kamil Debski <k.debski@...sung.com>
To:	'Tobias Klauser' <tklauser@...tanz.ch>
Cc:	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	lm-sensors@...sensors.org, Tomasz Figa <t.figa@...sung.com>,
	Marek Szyprowski <m.szyprowski@...sung.com>
Subject: RE: [PATCH] hwmon: pwm-fan: Add pwm-fan driver

Hi Tobias,

Thank you for your review.

> From: Tobias Klauser [mailto:tklauser@...tanz.ch]
> Sent: Wednesday, July 09, 2014 7:50 PM
> 
> 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.

Thanks for this suggestion.

> 
> > +#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

Best wishes,
-- 
Kamil Debski
Samsung R&D Institute Poland

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