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imxfb: add pwmr controlled backlight support 

Signed-off-by: Eric Bénard <eric@eukrea.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
This commit is contained in:
Eric Bénard 2010-07-16 15:09:07 +02:00 committed by Sascha Hauer
parent 7e688f0d77
commit 7a2bb23c14
1 changed files with 71 additions and 1 deletions
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72
drivers/video/imxfb.c
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@ -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;