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>
diff --git a/drivers/video/Kconfig b/drivers/video/Kconfig
index 6bafb51b..a222d65 100644
--- a/drivers/video/Kconfig
+++ b/drivers/video/Kconfig
@@ -2005,6 +2005,7 @@
select FB_SYS_IMAGEBLIT
select FB_SYS_FOPS
select FB_DEFERRED_IO
+ select FB_BACKLIGHT
select SH_MIPI_DSI if SH_LCD_MIPI_DSI
---help---
Frame buffer driver for the on-chip SH-Mobile LCD controller.
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 @@
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 @@
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 @@
.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 @@
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 @@
}
}
+ info->bl_dev = ch->bl;
+
error = register_framebuffer(info);
if (error < 0)
goto err1;
@@ -1404,6 +1480,11 @@
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);
diff --git a/drivers/video/sh_mobile_lcdcfb.h b/drivers/video/sh_mobile_lcdcfb.h
index 9ecee2f..03a22dc 100644
--- a/drivers/video/sh_mobile_lcdcfb.h
+++ b/drivers/video/sh_mobile_lcdcfb.h
@@ -16,6 +16,7 @@
struct sh_mobile_lcdc_priv;
struct fb_info;
+struct backlight_device;
struct sh_mobile_lcdc_chan {
struct sh_mobile_lcdc_priv *lcdc;
@@ -26,6 +27,7 @@
u32 pseudo_palette[PALETTE_NR];
unsigned long saved_ch_regs[NR_CH_REGS];
struct fb_info *info;
+ struct backlight_device *bl;
dma_addr_t dma_handle;
struct fb_deferred_io defio;
struct scatterlist *sglist;