diff options
author | Alexandre Courbot <gnurou@gmail.com> | 2011-02-16 03:49:01 (GMT) |
---|---|---|
committer | Paul Mundt <lethal@linux-sh.org> | 2011-03-10 11:20:57 (GMT) |
commit | 3b0fd9d75598584478d1d3f6551f8a8a9696c34e (patch) | |
tree | aec7b48dbbb6810b15885ea34cf8041798e534bb /drivers/video/sh_mobile_lcdcfb.c | |
parent | 35d34df711e8b44846e759d8cfddb4ec6877cccb (diff) | |
download | linux-fsl-qoriq-3b0fd9d75598584478d1d3f6551f8a8a9696c34e.tar.xz |
fbdev: sh_mobile_lcdcfb: add backlight support
Support for backlight devices controlled through board-specific
routines. Backlights can be defined per-channel and follow fbdev
directives to switch off as the LCD blanks or is turned on/off.
Signed-off-by: Alexandre Courbot <gnurou@gmail.com>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
Diffstat (limited to 'drivers/video/sh_mobile_lcdcfb.c')
-rw-r--r-- | drivers/video/sh_mobile_lcdcfb.c | 81 |
1 files changed, 81 insertions, 0 deletions
diff --git a/drivers/video/sh_mobile_lcdcfb.c b/drivers/video/sh_mobile_lcdcfb.c index bf12e53..e040e46 100644 --- a/drivers/video/sh_mobile_lcdcfb.c +++ b/drivers/video/sh_mobile_lcdcfb.c @@ -21,6 +21,8 @@ #include <linux/ioctl.h> #include <linux/slab.h> #include <linux/console.h> +#include <linux/backlight.h> +#include <linux/gpio.h> #include <video/sh_mobile_lcdc.h> #include <asm/atomic.h> @@ -618,6 +620,11 @@ static int sh_mobile_lcdc_start(struct sh_mobile_lcdc_priv *priv) board_cfg->display_on(board_cfg->board_data, ch->info); module_put(board_cfg->owner); } + + if (ch->bl) { + ch->bl->props.power = FB_BLANK_UNBLANK; + backlight_update_status(ch->bl); + } } return 0; @@ -648,6 +655,11 @@ static void sh_mobile_lcdc_stop(struct sh_mobile_lcdc_priv *priv) sh_mobile_lcdc_clk_on(priv); } + if (ch->bl) { + ch->bl->props.power = FB_BLANK_POWERDOWN; + backlight_update_status(ch->bl); + } + board_cfg = &ch->cfg.board_cfg; if (try_module_get(board_cfg->owner) && board_cfg->display_off) { board_cfg->display_off(board_cfg->board_data); @@ -980,6 +992,64 @@ static struct fb_ops sh_mobile_lcdc_ops = { .fb_check_var = sh_mobile_check_var, }; +static int sh_mobile_lcdc_update_bl(struct backlight_device *bdev) +{ + struct sh_mobile_lcdc_chan *ch = bl_get_data(bdev); + struct sh_mobile_lcdc_board_cfg *cfg = &ch->cfg.board_cfg; + int brightness = bdev->props.brightness; + + if (bdev->props.power != FB_BLANK_UNBLANK || + bdev->props.state & (BL_CORE_SUSPENDED | BL_CORE_FBBLANK)) + brightness = 0; + + return cfg->set_brightness(cfg->board_data, brightness); +} + +static int sh_mobile_lcdc_get_brightness(struct backlight_device *bdev) +{ + struct sh_mobile_lcdc_chan *ch = bl_get_data(bdev); + struct sh_mobile_lcdc_board_cfg *cfg = &ch->cfg.board_cfg; + + return cfg->get_brightness(cfg->board_data); +} + +static int sh_mobile_lcdc_check_fb(struct backlight_device *bdev, + struct fb_info *info) +{ + return (info->bl_dev == bdev); +} + +static struct backlight_ops sh_mobile_lcdc_bl_ops = { + .options = BL_CORE_SUSPENDRESUME, + .update_status = sh_mobile_lcdc_update_bl, + .get_brightness = sh_mobile_lcdc_get_brightness, + .check_fb = sh_mobile_lcdc_check_fb, +}; + +static struct backlight_device *sh_mobile_lcdc_bl_probe(struct device *parent, + struct sh_mobile_lcdc_chan *ch) +{ + struct backlight_device *bl; + + bl = backlight_device_register(ch->cfg.bl_info.name, parent, ch, + &sh_mobile_lcdc_bl_ops, NULL); + if (!bl) { + dev_err(parent, "unable to register backlight device\n"); + return NULL; + } + + bl->props.max_brightness = ch->cfg.bl_info.max_brightness; + bl->props.brightness = bl->props.max_brightness; + backlight_update_status(bl); + + return bl; +} + +static void sh_mobile_lcdc_bl_remove(struct backlight_device *bdev) +{ + backlight_device_unregister(bdev); +} + static int sh_mobile_lcdc_set_bpp(struct fb_var_screeninfo *var, int bpp) { switch (bpp) { @@ -1198,6 +1268,10 @@ static int __devinit sh_mobile_lcdc_probe(struct platform_device *pdev) init_completion(&ch->vsync_completion); ch->pan_offset = 0; + /* probe the backlight is there is one defined */ + if (ch->cfg.bl_info.max_brightness) + ch->bl = sh_mobile_lcdc_bl_probe(&pdev->dev, ch); + switch (pdata->ch[i].chan) { case LCDC_CHAN_MAINLCD: ch->enabled = 1 << 1; @@ -1345,6 +1419,8 @@ static int __devinit sh_mobile_lcdc_probe(struct platform_device *pdev) } } + info->bl_dev = ch->bl; + error = register_framebuffer(info); if (error < 0) goto err1; @@ -1404,6 +1480,11 @@ static int sh_mobile_lcdc_remove(struct platform_device *pdev) framebuffer_release(info); } + for (i = 0; i < ARRAY_SIZE(priv->ch); i++) { + if (priv->ch[i].bl) + sh_mobile_lcdc_bl_remove(priv->ch[i].bl); + } + if (priv->dot_clk) clk_put(priv->dot_clk); |