linux-kernel - Re: [PATCH v5 3/3] leds: Add ktd2692 flash LED driver

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Date:	Fri, 10 Apr 2015 15:42:44 +0900
From:	Ingi Kim <ingi2.kim@...sung.com>
To:	Joe Perches <joe@...ches.com>
Cc:	cooloney@...il.com, rpurdie@...ys.net, robh+dt@...nel.org,
	pawel.moll@....com, mark.rutland@....com,
	ijc+devicetree@...lion.org.uk, galak@...eaurora.org,
	sakari.ailus@....fi, j.anaszewski@...sung.com,
	varkabhadram@...il.com, sw0312.kim@...sung.com,
	cw00.choi@...sung.com, jh80.chung@...sung.com,
	ideal.song@...sung.com, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-leds@...r.kernel.org
Subject: Re: [PATCH v5 3/3] leds: Add ktd2692 flash LED driver

Hi Joe,

Thanks for the review.

On 2015년 04월 01일 13:07, Joe Perches wrote:
> On Wed, 2015-04-01 at 12:58 +0900, Ingi Kim wrote:
>> This patch adds a driver to support the ktd2692 flash LEDs.
>> ktd2692 can control flash current by ExpressWire interface.
> 
> trivia:
> 
>> diff --git a/drivers/leds/leds-ktd2692.c b/drivers/leds/leds-ktd2692.c
> []
>> +static void ktd2692_brightness_set(struct ktd2692_context *led,
>> +					enum led_brightness brightness)
>> +{
>> +	mutex_lock(&led->lock);
>> +
>> +	if (brightness == LED_OFF) {
>> +		led->mode = KTD2692_MODE_DISABLE;
>> +		gpio_set_value(led->aux_gpio, KTD2692_LOW);
>> +		goto out;
>> +	}
>> +
>> +	ktd2692_expresswire_write(led, KTD2692_REG_MOVIE_CURRENT_BASE |
>> +				KTD2692_BRIGHTNESS_RANGE_255_TO_8(brightness));
>> +	led->mode = KTD2692_MODE_MOVIE;
>> +
>> +out:
>> +	ktd2692_expresswire_write(led, led->mode | KTD2692_REG_MODE_BASE);
>> +	mutex_unlock(&led->lock);
>> +}
> 
> Perhaps this function would be better with if/else
> without the out: label
> 
>> +static int ktd2692_led_flash_strobe_set(struct led_classdev_flash *fled_cdev,
>> +						bool state)
>> +{
>> +	struct ktd2692_context *led = fled_cdev_to_led(fled_cdev);
>> +	struct led_flash_setting *timeout = &fled_cdev->timeout;
>> +	u32 flash_tm_reg;
>> +
>> +	mutex_lock(&led->lock);
>> +
>> +	if (state == 0) {
>> +		led->mode = KTD2692_MODE_DISABLE;
>> +		gpio_set_value(led->aux_gpio, KTD2692_LOW);
>> +		goto done;
>> +	}
>> +
>> +	flash_tm_reg = GET_TIMEOUT_OFFSET(timeout->val, timeout->step);
>> +	ktd2692_expresswire_write(led, flash_tm_reg
>> +			| KTD2692_REG_FLASH_TIMEOUT_BASE);
>> +
>> +	led->mode = KTD2692_MODE_FLASH;
>> +	gpio_set_value(led->aux_gpio, KTD2692_HIGH);
>> +
>> +done:
>> +	ktd2692_expresswire_write(led, led->mode | KTD2692_REG_MODE_BASE);
> 
> Same if/else with the done: label?
> 
> 

Sorry about late comments,
It'll be pushed next patch

Thank you
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