linux-kernel - Re: [PATCHv5 11/11] fbdev: ssd1307fb: Add blank mode

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Message-ID: <20150325220059.GP23664@lukather>
Date:	Wed, 25 Mar 2015 15:00:59 -0700
From:	Maxime Ripard <maxime.ripard@...e-electrons.com>
To:	Olliver Schinagl <oliver@...inagl.nl>
Cc:	Thomas Niederprüm <niederp@...sik.uni-kl.de>,
	plagnioj@...osoft.com, tomi.valkeinen@...com,
	kernel@...gutronix.de, shawn.guo@...aro.org, robh+dt@...nel.org,
	linux-fbdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCHv5 11/11] fbdev: ssd1307fb: Add blank mode

On Wed, Mar 25, 2015 at 04:50:05PM +0100, Olliver Schinagl wrote:
> Hey Thomas,
> 
> On 24-03-15 22:23, Thomas Niederprüm wrote:
> >This patch adds ssd1307fb_blank() to make the framebuffer capable
> >of blanking.
> >
> >Signed-off-by: Thomas Niederprüm <niederp@...sik.uni-kl.de>
> >---
> >  drivers/video/fbdev/ssd1307fb.c | 13 +++++++++++++
> >  1 file changed, 13 insertions(+)
> >
> >diff --git a/drivers/video/fbdev/ssd1307fb.c b/drivers/video/fbdev/ssd1307fb.c
> >index 061cc95..9101b27 100644
> >--- a/drivers/video/fbdev/ssd1307fb.c
> >+++ b/drivers/video/fbdev/ssd1307fb.c
> >@@ -238,6 +238,18 @@ static ssize_t ssd1307fb_write(struct fb_info *info, const char __user *buf,
> >  	return count;
> >  }
> >
> >+static int ssd1307fb_blank(int blank_mode, struct fb_info *info)
> >+{
> >+	struct ssd1307fb_par *par = info->par;
> >+	int ret;
> >+
> >+	if (blank_mode != FB_BLANK_UNBLANK)
> >+		ret = ssd1307fb_write_cmd(par->client, SSD1307FB_DISPLAY_OFF);
> >+	else
> >+		ret = ssd1307fb_write_cmd(par->client, SSD1307FB_DISPLAY_ON);
> I'd probably add an extra return, or drop the ret var at all and just return
> the function.
> 
> or even shorter :)
> return sd1307fb_write_cmd(par->client, (blank_mode != FB_BLANK_UNBLANK) ?
> SSD1307FB_DISPLAY_OFF : SSD1307FB_DISPLAY_ON;

In some domains, shorter is not better ;)

This is one of these cases. It's much clearer as it is.

Maxime

-- 
Maxime Ripard, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com

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