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authorEric Bénard <eric@eukrea.com>2010-07-16 15:09:07 +0200
committerSascha Hauer <s.hauer@pengutronix.de>2010-07-26 14:29:21 +0200
commit7a2bb23c149e9f093b2b83c16c25991e32ef4ec3 (patch)
tree060e3488d629a3c48a2b4d1980149a960159b477
parent7e688f0d77f90c531747afa552d72ea70c2f0803 (diff)
imxfb: add pwmr controlled backlight support
Signed-off-by: Eric Bénard <eric@eukrea.com> Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
-rw-r--r--drivers/video/imxfb.c72
1 files changed, 71 insertions, 1 deletions
diff --git a/drivers/video/imxfb.c b/drivers/video/imxfb.c
index b4b6deceed1..43f0639b1c1 100644
--- a/drivers/video/imxfb.c
+++ b/drivers/video/imxfb.c
@@ -175,6 +175,7 @@ struct imxfb_info {
struct imx_fb_videomode *mode;
int num_modes;
+ struct backlight_device *bl;
void (*lcd_power)(int);
void (*backlight_power)(int);
@@ -449,6 +450,73 @@ static int imxfb_set_par(struct fb_info *info)
return 0;
}
+
+
+static int imxfb_bl_get_brightness(struct backlight_device *bl)
+{
+ struct imxfb_info *fbi = bl_get_data(bl);
+
+ return readl(fbi->regs + LCDC_PWMR) & 0xFF;
+}
+
+static int imxfb_bl_update_status(struct backlight_device *bl)
+{
+ struct imxfb_info *fbi = bl_get_data(bl);
+ int brightness = bl->props.brightness;
+
+ if (bl->props.power != FB_BLANK_UNBLANK)
+ brightness = 0;
+ if (bl->props.fb_blank != FB_BLANK_UNBLANK)
+ brightness = 0;
+
+ fbi->pwmr = (fbi->pwmr & ~0xFF) | brightness;
+
+ if (bl->props.fb_blank != FB_BLANK_UNBLANK)
+ clk_enable(fbi->clk);
+ writel(fbi->pwmr, fbi->regs + LCDC_PWMR);
+ if (bl->props.fb_blank != FB_BLANK_UNBLANK)
+ clk_disable(fbi->clk);
+
+ return 0;
+}
+
+static const struct backlight_ops imxfb_lcdc_bl_ops = {
+ .update_status = imxfb_bl_update_status,
+ .get_brightness = imxfb_bl_get_brightness,
+};
+
+static void imxfb_init_backlight(struct imxfb_info *fbi)
+{
+ struct backlight_properties props;
+ struct backlight_device *bl;
+
+ if (fbi->bl)
+ return;
+
+ memset(&props, 0, sizeof(struct backlight_properties));
+ props.max_brightness = 0xff;
+ writel(fbi->pwmr, fbi->regs + LCDC_PWMR);
+
+ bl = backlight_device_register("imxfb-bl", &fbi->pdev->dev, fbi,
+ &imxfb_lcdc_bl_ops, &props);
+ if (IS_ERR(bl)) {
+ dev_err(&fbi->pdev->dev, "error %ld on backlight register\n",
+ PTR_ERR(bl));
+ return;
+ }
+
+ fbi->bl = bl;
+ bl->props.power = FB_BLANK_UNBLANK;
+ bl->props.fb_blank = FB_BLANK_UNBLANK;
+ bl->props.brightness = imxfb_bl_get_brightness(bl);
+}
+
+static void imxfb_exit_backlight(struct imxfb_info *fbi)
+{
+ if (fbi->bl)
+ backlight_device_unregister(fbi->bl);
+}
+
static void imxfb_enable_controller(struct imxfb_info *fbi)
{
pr_debug("Enabling LCD controller\n");
@@ -579,7 +647,6 @@ static int imxfb_activate_var(struct fb_var_screeninfo *var, struct fb_info *inf
fbi->regs + LCDC_SIZE);
writel(fbi->pcr, fbi->regs + LCDC_PCR);
- writel(fbi->pwmr, fbi->regs + LCDC_PWMR);
writel(fbi->lscr1, fbi->regs + LCDC_LSCR1);
writel(fbi->dmacr, fbi->regs + LCDC_DMACR);
@@ -779,6 +846,8 @@ static int __init imxfb_probe(struct platform_device *pdev)
}
imxfb_enable_controller(fbi);
+ fbi->pdev = pdev;
+ imxfb_init_backlight(fbi);
return 0;
@@ -816,6 +885,7 @@ static int __devexit imxfb_remove(struct platform_device *pdev)
imxfb_disable_controller(fbi);
+ imxfb_exit_backlight(fbi);
unregister_framebuffer(info);
pdata = pdev->dev.platform_data;