linux-kernel - Re: [PATCH v7 6/8] Loongson: YeeLoong: add video output driver

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Message-ID: <20091204081124.GC1540@ucw.cz>
Date:	Fri, 4 Dec 2009 09:11:25 +0100
From:	Pavel Machek <pavel@....cz>
To:	Wu Zhangjin <wuzhangjin@...il.com>
Cc:	Ralf Baechle <ralf@...ux-mips.org>, akpm@...ux-foundation.org,
	linux-mips@...ux-mips.org, linux-kernel@...r.kernel.org,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	"Rafael J. Wysocki" <rjw@...k.pl>, zhangfx@...ote.com,
	linux-laptop@...r.kernel.org, luming.yu@...el.com
Subject: Re: [PATCH v7 6/8] Loongson: YeeLoong: add video output driver

On Fri 2009-12-04 21:36:43, Wu Zhangjin wrote:
> From: Wu Zhangjin <wuzhangjin@...il.com>
> 
> This patch adds Video Output Driver, it provides standard
> interface(/sys/class/video_output) to turn on/off the video output of
> LCD, CRT.
> 

> diff --git a/drivers/platform/mips/Kconfig b/drivers/platform/mips/Kconfig
> index 9c8385c..4a89c01 100644
> --- a/drivers/platform/mips/Kconfig
> +++ b/drivers/platform/mips/Kconfig
> @@ -21,6 +21,7 @@ config LEMOTE_YEELOONG2F
>  	select SYS_SUPPORTS_APM_EMULATION
>  	select APM_EMULATION
>  	select HWMON
> +	select VIDEO_OUTPUT_CONTROL
>  	default m
>  	help
>  	  YeeLoong netbook is a mini laptop made by Lemote, which is basically

default m is evil.

> +	if (status == BIT_DISPLAY_LCD_ON) {
> +		/* Turn on LCD */
> +		outb(0x31, 0x3c4);
> +		value = inb(0x3c5);
> +		value = (value & 0xf8) | 0x03;
> +		outb(0x31, 0x3c4);
> +		outb(value, 0x3c5);
> +		/* Turn on backlight */
> +		ec_write(REG_BACKLIGHT_CTRL, BIT_BACKLIGHT_ON);
> +	} else {
> +		/* Turn off backlight */
> +		ec_write(REG_BACKLIGHT_CTRL, BIT_BACKLIGHT_OFF);
> +		/* Turn off LCD */
> +		outb(0x31, 0x3c4);
> +		value = inb(0x3c5);
> +		value = (value & 0xf8) | 0x02;
> +		outb(0x31, 0x3c4);
> +		outb(value, 0x3c5);
> +	}

IIRC this is opencoded in suspend support; should that get common
helpers?

> +	if (status == BIT_CRT_DETECT_PLUG) {
> +		if (ec_read(REG_CRT_DETECT) == BIT_CRT_DETECT_PLUG) {
> +			/* Turn on CRT */
> +			outb(0x21, 0x3c4);
> +			value = inb(0x3c5);
> +			value &= ~(1 << 7);
> +			outb(0x21, 0x3c4);
> +			outb(value, 0x3c5);
> +		}
> +	} else {
> +		/* Turn off CRT */
> +		outb(0x21, 0x3c4);
> +		value = inb(0x3c5);
> +		value |= (1 << 7);
> +		outb(0x21, 0x3c4);
> +		outb(value, 0x3c5);
> +	}

This looks suspiciously similar to one another and to code
above. Perhaps some more helpers?

								Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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