linux-kernel - Re: [PATCH v6 4/5] Input: add haptic drvier on max77843

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Date:	Mon, 02 Mar 2015 15:08:14 +0900
From:	Jaewon Kim <jaewon02.kim@...sung.com>
To:	Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc:	linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
	linux-pm@...r.kernel.org, linux-input@...r.kernel.org,
	Inki Dae <inki.dae@...sung.com>,
	SangBae Lee <sangbae90.lee@...sung.com>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Lee Jones <lee.jones@...aro.org>,
	Chanwoo Choi <cw00.choi@...sung.com>,
	Sebastian Reichel <sre@...nel.org>,
	Beomho Seo <beomho.seo@...sung.com>
Subject: Re: [PATCH v6 4/5] Input: add haptic drvier on max77843

HI Dmitry,

On 28/02/2015 02:49, Dmitry Torokhov wrote:
> On Thu, Feb 26, 2015 at 11:49:36AM +0900, Jaewon Kim wrote:
>> Hi Dmitry,
>>
>> On 26/02/2015 10:23, Dmitry Torokhov wrote:
>>> Hi Jaewon,
>>>
>>> On Tue, Feb 24, 2015 at 10:29:07AM +0900, Jaewon Kim wrote:
>>>> +static void max77843_haptic_play_work(struct work_struct *work)
>>>> +{
>>>> +	struct max77843_haptic *haptic =
>>>> +			container_of(work, struct max77843_haptic, work);
>>>> +	int error;
>>>> +
>>>> +	mutex_lock(&haptic->mutex);
>>>> +
>>>> +	if (haptic->suspended) {
>>>> +		goto err_play;
>>>> +	}
>>>> +
>>> You do not need braces around single statement. Also, this is not error
>>> that you are handling, I'd prefer if we called this label out_unlock.
>> You are right.
>> I will change label name and remove braces.
>>>> +	error = max77843_haptic_set_duty_cycle(haptic);
>>>> +	if (error) {
>>>> +		dev_err(haptic->dev, "failed to set duty cycle: %d\n", error);
>>>> +		goto err_play;
>>>> +	}
>>> Do you need to configure duty cycle if you stopping the playback? Or
>>> maybe disabling pwm is enough?
>> It do not need to set duty cycle requisitely when disabling haptic.
>>
>> I will move this function to front of max77843_haptic_enable().
>>
>>>> +
>>>> +	if (haptic->magnitude) {
>>>> +		error = max77843_haptic_enable(haptic);
>>>> +		if (error)
>>>> +			dev_err(haptic->dev,
>>>> +					"cannot enable haptic: %d\n", error);
>>>> +	} else {
>>>> +		max77843_haptic_disable(haptic);
>>>> +		if (error)
>>>> +			dev_err(haptic->dev,
>>>> +					"cannot disable haptic: %d\n", error);
>>> What error? You did not assign it...
>> Detailed error message printed in enable/disable() function.
> What I was trying to say is that you do not assign new value to 'error'
> variable in this path; it still carries the value from
> max77843_haptic_set_duty_cycle() above and so this "if" statement will
> never work and the message will never show up.
I never image at all that i am not assign 'error' variable.
I will assign it.

>
> Thanks.
>

Thanks,
Jaewon Kim
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