imxfb: add pwmr controlled backlight support
Signed-off-by: Eric Bénard <eric@eukrea.com> Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
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7e688f0d77
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7a2bb23c14
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@ -175,6 +175,7 @@ struct imxfb_info {
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struct imx_fb_videomode *mode;
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int num_modes;
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struct backlight_device *bl;
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void (*lcd_power)(int);
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void (*backlight_power)(int);
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@ -449,6 +450,73 @@ static int imxfb_set_par(struct fb_info *info)
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return 0;
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}
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static int imxfb_bl_get_brightness(struct backlight_device *bl)
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{
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struct imxfb_info *fbi = bl_get_data(bl);
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return readl(fbi->regs + LCDC_PWMR) & 0xFF;
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}
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static int imxfb_bl_update_status(struct backlight_device *bl)
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{
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struct imxfb_info *fbi = bl_get_data(bl);
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int brightness = bl->props.brightness;
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if (bl->props.power != FB_BLANK_UNBLANK)
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brightness = 0;
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if (bl->props.fb_blank != FB_BLANK_UNBLANK)
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brightness = 0;
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fbi->pwmr = (fbi->pwmr & ~0xFF) | brightness;
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if (bl->props.fb_blank != FB_BLANK_UNBLANK)
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clk_enable(fbi->clk);
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writel(fbi->pwmr, fbi->regs + LCDC_PWMR);
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if (bl->props.fb_blank != FB_BLANK_UNBLANK)
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clk_disable(fbi->clk);
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return 0;
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}
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static const struct backlight_ops imxfb_lcdc_bl_ops = {
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.update_status = imxfb_bl_update_status,
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.get_brightness = imxfb_bl_get_brightness,
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};
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static void imxfb_init_backlight(struct imxfb_info *fbi)
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{
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struct backlight_properties props;
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struct backlight_device *bl;
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if (fbi->bl)
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return;
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memset(&props, 0, sizeof(struct backlight_properties));
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props.max_brightness = 0xff;
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writel(fbi->pwmr, fbi->regs + LCDC_PWMR);
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bl = backlight_device_register("imxfb-bl", &fbi->pdev->dev, fbi,
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&imxfb_lcdc_bl_ops, &props);
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if (IS_ERR(bl)) {
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dev_err(&fbi->pdev->dev, "error %ld on backlight register\n",
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PTR_ERR(bl));
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return;
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}
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fbi->bl = bl;
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bl->props.power = FB_BLANK_UNBLANK;
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bl->props.fb_blank = FB_BLANK_UNBLANK;
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bl->props.brightness = imxfb_bl_get_brightness(bl);
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}
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static void imxfb_exit_backlight(struct imxfb_info *fbi)
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{
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if (fbi->bl)
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backlight_device_unregister(fbi->bl);
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}
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static void imxfb_enable_controller(struct imxfb_info *fbi)
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{
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pr_debug("Enabling LCD controller\n");
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@ -579,7 +647,6 @@ static int imxfb_activate_var(struct fb_var_screeninfo *var, struct fb_info *inf
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fbi->regs + LCDC_SIZE);
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writel(fbi->pcr, fbi->regs + LCDC_PCR);
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writel(fbi->pwmr, fbi->regs + LCDC_PWMR);
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writel(fbi->lscr1, fbi->regs + LCDC_LSCR1);
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writel(fbi->dmacr, fbi->regs + LCDC_DMACR);
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@ -779,6 +846,8 @@ static int __init imxfb_probe(struct platform_device *pdev)
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}
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imxfb_enable_controller(fbi);
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fbi->pdev = pdev;
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imxfb_init_backlight(fbi);
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return 0;
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@ -816,6 +885,7 @@ static int __devexit imxfb_remove(struct platform_device *pdev)
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imxfb_disable_controller(fbi);
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imxfb_exit_backlight(fbi);
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unregister_framebuffer(info);
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pdata = pdev->dev.platform_data;
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