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Commit 1a468ba1 authored by Mario Schwalbe's avatar Mario Schwalbe Committed by Richard Purdie
Browse files

backlight: mbp_nvidia_bl - Add a debug switch 



This patch adds a debug switch to enable (little) diagnostic
output, to help to trace down the remaining problems.

Signed-off-by: default avatarMario Schwalbe <schwalbe@inf.tu-dresden.de>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarRichard Purdie <rpurdie@linux.intel.com>
parent c78a6288

drivers/video/backlight/mbp_nvidia_bl.c

+31 −2
Original line number Diff line number Diff line
@@ -36,6 +36,11 @@ struct dmi_match_data { 
	struct backlight_ops backlight_ops;

};



/* Module parameters. */

static int debug;

module_param_named(debug, debug, int, 0644);

MODULE_PARM_DESC(debug, "Set to one to enable debugging messages.");



/*

 * Implementation for MacBooks with Intel chipset.

 */
@@ -43,6 +48,10 @@ static int intel_chipset_send_intensity(struct backlight_device *bd) 
{

	int intensity = bd->props.brightness;



	if (debug)

		printk(KERN_DEBUG "mbp_nvidia_bl: setting brightness to %d\n",

		       intensity);



	outb(0x04 | (intensity << 4), 0xb3);

	outb(0xbf, 0xb2);

	return 0;
@@ -50,9 +59,17 @@ static int intel_chipset_send_intensity(struct backlight_device *bd) 


static int intel_chipset_get_intensity(struct backlight_device *bd)

{

	int intensity;



	outb(0x03, 0xb3);

	outb(0xbf, 0xb2);

	return inb(0xb3) >> 4;

	intensity = inb(0xb3) >> 4;



	if (debug)

		printk(KERN_DEBUG "mbp_nvidia_bl: read brightness of %d\n",

		       intensity);



	return intensity;

}



static const struct dmi_match_data intel_chipset_data = {
@@ -72,6 +89,10 @@ static int nvidia_chipset_send_intensity(struct backlight_device *bd) 
{

	int intensity = bd->props.brightness;



	if (debug)

		printk(KERN_DEBUG "mbp_nvidia_bl: setting brightness to %d\n",

		       intensity);



	outb(0x04 | (intensity << 4), 0x52f);

	outb(0xbf, 0x52e);

	return 0;
@@ -79,9 +100,17 @@ static int nvidia_chipset_send_intensity(struct backlight_device *bd) 


static int nvidia_chipset_get_intensity(struct backlight_device *bd)

{

	int intensity;



	outb(0x03, 0x52f);

	outb(0xbf, 0x52e);

	return inb(0x52f) >> 4;

	intensity = inb(0x52f) >> 4;



	if (debug)

		printk(KERN_DEBUG "mbp_nvidia_bl: read brightness of %d\n",

		       intensity);



	return intensity;

}



static const struct dmi_match_data nvidia_chipset_data = {