ARM: mach-shmobile: Dynamic backlight control for Mackerel

Use GPIO_PORT31 to control the backlight on the Mackerel board.

Signed-off-by: Magnus Damm <damm@opensource.se>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

1 files changed, 21 insertions, 1 deletions

diff --git a/arch/arm/mach-shmobile/board-mackerel.c b/arch/arm/mach-shmobile/board-mackerel.c
index 1a63c213e45d..badd8ada0659 100644
--- a/arch/arm/mach-shmobile/board-mackerel.c
+++ b/arch/arm/mach-shmobile/board-mackerel.c
@@ -295,6 +295,18 @@ static struct fb_videomode mackerel_lcdc_modes[] = {
         },
 };
 
+static int mackerel_set_brightness(void *board_data, int brightness)
+{
+        gpio_set_value(GPIO_PORT31, brightness);
+
+        return 0;
+}
+
+static int mackerel_get_brightness(void *board_data)
+{
+        return gpio_get_value(GPIO_PORT31);
+}
+
 static struct sh_mobile_lcdc_info lcdc_info = {
         .clock_source = LCDC_CLK_BUS,
         .ch[0] = {
@@ -307,6 +319,14 @@ static struct sh_mobile_lcdc_info lcdc_info = {
                 .flags                  = 0,
                 .lcd_size_cfg.width     = 152,
                 .lcd_size_cfg.height    = 91,
+                .board_cfg = {
+                        .set_brightness = mackerel_set_brightness,
+                        .get_brightness = mackerel_get_brightness,
+                },
+                .bl_info = {
+                        .name = "sh_mobile_lcdc_bl",
+                        .max_brightness = 1,
+                },
         }
 };
 
@@ -1059,7 +1079,7 @@ static void __init mackerel_init(void)
         gpio_request(GPIO_FN_LCDDCK,   NULL);
 
         gpio_request(GPIO_PORT31, NULL); /* backlight */
-        gpio_direction_output(GPIO_PORT31, 1);
+        gpio_direction_output(GPIO_PORT31, 0); /* off by default */
 
         gpio_request(GPIO_PORT151, NULL); /* LCDDON */
         gpio_direction_output(GPIO_PORT151, 1);