linux-kernel - Re: [PATCH v4 05/24] misc: max77693-haptic: use pwm_get

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Date:	Mon, 16 Nov 2015 07:55:33 -0800
From:	Guenter Roeck <linux@...ck-us.net>
To:	Boris Brezillon <boris.brezillon@...e-electrons.com>,
	Krzysztof Kozlowski <k.kozlowski@...sung.com>
Cc:	Thierry Reding <thierry.reding@...il.com>,
	linux-pwm@...r.kernel.org,
	Mike Turquette <mturquette@...libre.com>,
	Stephen Boyd <sboyd@...eaurora.org>, linux-clk@...r.kernel.org,
	Mark Brown <broonie@...nel.org>,
	Liam Girdwood <lgirdwood@...il.com>,
	Kamil Debski <k.debski@...sung.com>, lm-sensors@...sensors.org,
	Jean Delvare <jdelvare@...e.com>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	linux-input@...r.kernel.org, Bryan Wu <cooloney@...il.com>,
	Richard Purdie <rpurdie@...ys.net>,
	Jacek Anaszewski <j.anaszewski@...sung.com>,
	linux-leds@...r.kernel.org,
	Maxime Ripard <maxime.ripard@...e-electrons.com>,
	Chen-Yu Tsai <wens@...e.org>, linux-sunxi@...glegroups.com,
	Joachim Eastwood <manabian@...il.com>,
	Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>,
	Heiko Stuebner <heiko@...ech.de>,
	linux-rockchip@...ts.infradead.org,
	Jingoo Han <jingoohan1@...il.com>,
	Lee Jones <lee.jones@...aro.org>, linux-fbdev@...r.kernel.org,
	Jean-Christophe Plagniol-Villard <plagnioj@...osoft.com>,
	Tomi Valkeinen <tomi.valkeinen@...com>,
	Robert Jarzmik <robert.jarzmik@...e.fr>,
	Alexandre Belloni <alexandre.belloni@...e-electrons.com>,
	Julia Lawall <Julia.Lawall@...6.fr>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	k.kozlowski.k@...il.com
Subject: Re: [PATCH v4 05/24] misc: max77693-haptic: use pwm_get_xxx() helpers
 where appropriate

On 11/16/2015 05:55 AM, Boris Brezillon wrote:
> Hi Krzysztof,
>
> On Mon, 16 Nov 2015 22:10:40 +0900
> Krzysztof Kozlowski <k.kozlowski@...sung.com> wrote:
>
>> W dniu 16.11.2015 o 17:56, Boris Brezillon pisze:
>>> Use pwm_get_xxx() helpers instead of directly accessing the pwm->xxx field.
>>> Doing that will ease adaptation of the PWM framework to support atomic
>>> update.
>>>
>>> Signed-off-by: Boris Brezillon <boris.brezillon@...e-electrons.com>
>>> ---
>>> Patch generated with the following coccinelle script:
>>>
>>> --->8---
>>> virtual patch
>>>
>>> @@
>>> struct pwm_device *p;
>>> expression e;
>>> @@
>>> (
>>> -(p)->polarity = e;
>>> +pwm_set_polarity((p), e);
>>> |
>>> -(p)->polarity
>>> +pwm_get_polarity((p))
>>> |
>>> -(p)->period = e;
>>> +pwm_set_period((p), e);
>>> |
>>> -(p)->period
>>> +pwm_get_period((p))
>>> |
>>> -(p)->duty_cycle = e;
>>> +pwm_set_duty_cycle((p), e);
>>> |
>>> -(p)->duty_cycle
>>> +pwm_get_duty_cycle((p))
>>> )
>>> --->8---
>>> ---
>>>   drivers/input/misc/max77693-haptic.c | 7 ++++---
>>>   1 file changed, 4 insertions(+), 3 deletions(-)
>>>
>>> diff --git a/drivers/input/misc/max77693-haptic.c b/drivers/input/misc/max77693-haptic.c
>>> index 6d96bff..a038fb3 100644
>>> --- a/drivers/input/misc/max77693-haptic.c
>>> +++ b/drivers/input/misc/max77693-haptic.c
>>> @@ -70,10 +70,11 @@ struct max77693_haptic {
>>>
>>>   static int max77693_haptic_set_duty_cycle(struct max77693_haptic *haptic)
>>>   {
>>> -	int delta = (haptic->pwm_dev->period + haptic->pwm_duty) / 2;
>>> +	int delta = (pwm_get_period((haptic->pwm_dev)) + haptic->pwm_duty) / 2;
>>
>> Double parentheses over argument are not needed so just:
>> pwm_get_period(haptic->pwm_dev) + ...
>
> Actually it was generated with coccinelle, hence I didn't fix existing
> coding style issues, but I have no problem fixing them.
>
There was no existing coding style issue. Your coccinelle script introduces it.
You might want to consider updating your script and remove the unnecessary (( ))
from it.

Guenter

> Thanks,
>
> Boris
>
>>
>> Beside that patch looks good, so with removing parentheses here and below:
>>
>> Reviewed-by: Krzysztof Kozlowski <k.kozlowski@...sung.com>
>>
>> Best regards,
>> Krzysztof
>>
>>>   	int error;
>>>
>>> -	error = pwm_config(haptic->pwm_dev, delta, haptic->pwm_dev->period);
>>> +	error = pwm_config(haptic->pwm_dev, delta,
>>> +			   pwm_get_period((haptic->pwm_dev)));
>>>   	if (error) {
>>>   		dev_err(haptic->dev, "failed to configure pwm: %d\n", error);
>>>   		return error;
>>> @@ -245,7 +246,7 @@ static int max77693_haptic_play_effect(struct input_dev *dev, void *data,
>>>   	 * The formula to convert magnitude to pwm_duty as follows:
>>>   	 * - pwm_duty = (magnitude * pwm_period) / MAX_MAGNITUDE(0xFFFF)
>>>   	 */
>>> -	period_mag_multi = (u64)haptic->pwm_dev->period * haptic->magnitude;
>>> +	period_mag_multi = (u64)pwm_get_period((haptic->pwm_dev)) * haptic->magnitude;
>>>   	haptic->pwm_duty = (unsigned int)(period_mag_multi >>
>>>   						MAX_MAGNITUDE_SHIFT);
>>>
>>>
>>
>
>
>

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