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authorDavid Brownell <dbrownell@users.sourceforge.net>2008-02-06 04:39:26 -0500
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2008-02-06 13:41:16 -0500
commita9a84c37d1ee50db8f3752b117caf2b48dcd4f8a (patch)
treeadac878234cbe372624c5d33e7d70322972392d7 /include/video/atmel_lcdc.h
parentb1230ee50a9903a987feaad767fb71e2fd173894 (diff)
atmel_lcdfb: backlight control
On the sam9 EK boards, the LCD backlight is hooked up to a PWM output from the LCD controller. It's controlled by "contrast" registers though. This patch lets boards declare that they have that kind of backlight control. The driver can then export this control, letting screenblank and other operations actually take effect ... reducing the typically substantial power drain from the backlight. Note that it's not fully cooked - doesn't force backlight off during system suspend - the "power" and "blank" events may not be done right This should be easily added in the future. [nicolas.ferre@atmel.com: remove unneeded inline and rename functions] Signed-off-by: David Brownell <dbrownell@users.sourceforge.net> Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com> Cc: Andrew Victor <linux@maxim.org.za> Cc: Russell King <rmk@arm.linux.org.uk> Cc: "Antonino A. Daplas" <adaplas@pol.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/video/atmel_lcdc.h')
-rw-r--r--include/video/atmel_lcdc.h11
1 files changed, 9 insertions, 2 deletions
diff --git a/include/video/atmel_lcdc.h b/include/video/atmel_lcdc.h
index 76095e70935b..336c20db87f8 100644
--- a/include/video/atmel_lcdc.h
+++ b/include/video/atmel_lcdc.h
@@ -22,7 +22,7 @@
22#ifndef __ATMEL_LCDC_H__ 22#ifndef __ATMEL_LCDC_H__
23#define __ATMEL_LCDC_H__ 23#define __ATMEL_LCDC_H__
24 24
25 /* LCD Controller info data structure */ 25 /* LCD Controller info data structure, stored in device platform_data */
26struct atmel_lcdfb_info { 26struct atmel_lcdfb_info {
27 spinlock_t lock; 27 spinlock_t lock;
28 struct fb_info *info; 28 struct fb_info *info;
@@ -33,7 +33,14 @@ struct atmel_lcdfb_info {
33 struct platform_device *pdev; 33 struct platform_device *pdev;
34 struct clk *bus_clk; 34 struct clk *bus_clk;
35 struct clk *lcdc_clk; 35 struct clk *lcdc_clk;
36 unsigned int default_bpp; 36
37#ifdef CONFIG_BACKLIGHT_ATMEL_LCDC
38 struct backlight_device *backlight;
39 u8 bl_power;
40#endif
41 bool lcdcon_is_backlight;
42
43 u8 default_bpp;
37 unsigned int default_lcdcon2; 44 unsigned int default_lcdcon2;
38 unsigned int default_dmacon; 45 unsigned int default_dmacon;
39 void (*atmel_lcdfb_power_control)(int on); 46 void (*atmel_lcdfb_power_control)(int on);