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authorDavid Brownell <dbrownell@users.sourceforge.net>2008-04-28 05:15:20 -0400
committerLinus Torvalds <torvalds@linux-foundation.org>2008-04-28 11:58:38 -0400
commitcf19a37e0641d975d271a5a30f097dd6b96d232f (patch)
treebc5876359c353ac5f072cb9858d8dd4e5db731f7 /drivers/video/atmel_lcdfb.c
parent01d3a5e7fab7732cfc5d5d4533e9378ea435295a (diff)
atmel_lcdfb: suspend/resume support
Teach atmel_lcdfb driver how to suspend/resume. Note that the backlight control should probably do more of the same stuff: turning off display power (more than just the backlight) and stopping the clocks (and dma to drive the no-longer-seen display). No point in wasting power to generate images that can't be observed, after all... Signed-off-by: David Brownell <dbrownell@users.sourceforge.net> Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com> Cc: Hans-Christian Egtvedt <hcegtvedt@atmel.com> Cc: Haavard Skinnemoen <hskinnemoen@atmel.com> Cc: Andrew Victor <avictor.za@gmail.com> 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 'drivers/video/atmel_lcdfb.c')
-rw-r--r--drivers/video/atmel_lcdfb.c36
1 files changed, 34 insertions, 2 deletions
diff --git a/drivers/video/atmel_lcdfb.c b/drivers/video/atmel_lcdfb.c
index 4d68b1b880d6..6fcf76c12910 100644
--- a/drivers/video/atmel_lcdfb.c
+++ b/drivers/video/atmel_lcdfb.c
@@ -909,10 +909,42 @@ static int __exit atmel_lcdfb_remove(struct platform_device *pdev)
909 return 0; 909 return 0;
910} 910}
911 911
912#ifdef CONFIG_PM
913
914static int atmel_lcdfb_suspend(struct platform_device *pdev, pm_message_t mesg)
915{
916 struct fb_info *info = platform_get_drvdata(pdev);
917 struct atmel_lcdfb_info *sinfo = info->par;
918
919 sinfo->saved_lcdcon = lcdc_readl(sinfo, ATMEL_LCDC_CONTRAST_VAL);
920 lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_CTR, 0);
921 if (sinfo->atmel_lcdfb_power_control)
922 sinfo->atmel_lcdfb_power_control(0);
923 atmel_lcdfb_stop_clock(sinfo);
924 return 0;
925}
926
927static int atmel_lcdfb_resume(struct platform_device *pdev)
928{
929 struct fb_info *info = platform_get_drvdata(pdev);
930 struct atmel_lcdfb_info *sinfo = info->par;
931
932 atmel_lcdfb_start_clock(sinfo);
933 if (sinfo->atmel_lcdfb_power_control)
934 sinfo->atmel_lcdfb_power_control(1);
935 lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_CTR, sinfo->saved_lcdcon);
936 return 0;
937}
938
939#else
940#define atmel_lcdfb_suspend NULL
941#define atmel_lcdfb_resume NULL
942#endif
943
912static struct platform_driver atmel_lcdfb_driver = { 944static struct platform_driver atmel_lcdfb_driver = {
913 .remove = __exit_p(atmel_lcdfb_remove), 945 .remove = __exit_p(atmel_lcdfb_remove),
914 946 .suspend = atmel_lcdfb_suspend,
915// FIXME need suspend, resume 947 .resume = atmel_lcdfb_resume,
916 948
917 .driver = { 949 .driver = {
918 .name = "atmel_lcdfb", 950 .name = "atmel_lcdfb",