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Message-id: <5652E85E.3040507@samsung.com>
Date: Mon, 23 Nov 2015 11:20:14 +0100
From: Jacek Anaszewski <j.anaszewski@...sung.com>
To: Simon Arlott <simon@...e.lp0.eu>
Cc: Álvaro Fernández Rojas <noltari@...il.com>,
Jonas Gorski <jogo@...nwrt.org>,
Richard Purdie <rpurdie@...ys.net>, linux-leds@...r.kernel.org,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/2] leds-bcm6328: Swap LED ON and OFF definitions
On 11/15/2015 02:34 PM, Simon Arlott wrote:
> The values of BCM6328_LED_MODE_ON and BCM6328_LED_MODE_OFF were named
> for active low LEDs. These should be swapped so that they are named for
> the default case of active high LEDs.
>
> Signed-off-by: Simon Arlott <simon@...e.lp0.eu>
> ---
> On 05/11/15 10:41, Jacek Anaszewski wrote:
>> On 11/04/2015 04:46 PM, Álvaro Fernández Rojas wrote:
>>> BCM6328_LED_MODE_ON and BCM6328_LED_MODE_OFF values were extracted from
>>> Broadcom's GPL code, in which they assume leds are active low by default.
>>> I can confirm the code is correct as it is right now, since those values
>>> match the active high / low values of the LEDs managed by GPIO instead
>>> of by using this driver.
>>
>> BCM6328_LED_MODE_ON and BCM6328_LED_MODE_OFF should represent the values
>> that actually set the LED state according to the current logic.
>> Otherwise it will confuse people who will be analyzing this code.
>> We are interested in the logic as it is seen from this driver's
>> perspective and not GPIO perspective.
>>
>> IMO the values should be swapped.
>
> drivers/leds/leds-bcm6328.c | 12 ++++++------
> 1 file changed, 6 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/leds/leds-bcm6328.c b/drivers/leds/leds-bcm6328.c
> index 95d0cf9..0329dee 100644
> --- a/drivers/leds/leds-bcm6328.c
> +++ b/drivers/leds/leds-bcm6328.c
> @@ -48,10 +48,10 @@
> BCM6328_SERIAL_LED_SHIFT_DIR)
>
> #define BCM6328_LED_MODE_MASK 3
> -#define BCM6328_LED_MODE_OFF 0
> +#define BCM6328_LED_MODE_ON 0
> #define BCM6328_LED_MODE_FAST 1
> #define BCM6328_LED_MODE_BLINK 2
> -#define BCM6328_LED_MODE_ON 3
> +#define BCM6328_LED_MODE_OFF 3
> #define BCM6328_LED_SHIFT(X) ((X) << 1)
>
> /**
> @@ -126,9 +126,9 @@ static void bcm6328_led_set(struct led_classdev *led_cdev,
> *(led->blink_leds) &= ~BIT(led->pin);
> if ((led->active_low && value == LED_OFF) ||
> (!led->active_low && value != LED_OFF))
> - bcm6328_led_mode(led, BCM6328_LED_MODE_OFF);
> - else
> bcm6328_led_mode(led, BCM6328_LED_MODE_ON);
> + else
> + bcm6328_led_mode(led, BCM6328_LED_MODE_OFF);
> spin_unlock_irqrestore(led->lock, flags);
> }
>
> @@ -303,8 +303,8 @@ static int bcm6328_led(struct device *dev, struct device_node *nc, u32 reg,
> val = bcm6328_led_read(mode) >>
> BCM6328_LED_SHIFT(shift % 16);
> val &= BCM6328_LED_MODE_MASK;
> - if ((led->active_low && val == BCM6328_LED_MODE_ON) ||
> - (!led->active_low && val == BCM6328_LED_MODE_OFF))
> + if ((led->active_low && val == BCM6328_LED_MODE_OFF) ||
> + (!led->active_low && val == BCM6328_LED_MODE_ON))
> led->cdev.brightness = LED_FULL;
> else
> led->cdev.brightness = LED_OFF;
>
Applied, thanks.
--
Best Regards,
Jacek Anaszewski
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