backlight: da903x_bl: control WLED output current in da9034

Update WLED output current source before changing brightness.

Signed-off-by: Haojian Zhuang <haojian.zhuang@marvell.com>
Signed-off-by: Eric Miao <eric.y.miao@gmail.com>

diff --git a/drivers/video/backlight/da903x_bl.c b/drivers/video/backlight/da903x_bl.c
index 701a108..7fcb0eb 100644 (file)
--- a/drivers/video/backlight/da903x_bl.c
+++ b/drivers/video/backlight/da903x_bl.c
@@ -25,6 +25,7 @@
 
 #define DA9034_WLED_CONTROL1   0x3C
 #define DA9034_WLED_CONTROL2   0x3D
+#define DA9034_WLED_ISET(x)    ((x) & 0x1f)
 
 #define DA9034_WLED_BOOST_EN   (1 << 5)
 
@@ -101,6 +102,7 @@ static struct backlight_ops da903x_backlight_ops = {
 
 static int da903x_backlight_probe(struct platform_device *pdev)
 {
+       struct da9034_backlight_pdata *pdata = pdev->dev.platform_data;
        struct da903x_backlight_data *data;
        struct backlight_device *bl;
        int max_brightness;
@@ -127,6 +129,11 @@ static int da903x_backlight_probe(struct platform_device *pdev)
        data->da903x_dev = pdev->dev.parent;
        data->current_brightness = 0;
 
+       /* adjust the WLED output current */
+       if (pdata)
+               da903x_write(data->da903x_dev, DA9034_WLED_CONTROL2,
+                               DA9034_WLED_ISET(pdata->output_current));
+
        bl = backlight_device_register(pdev->name, data->da903x_dev,
                        data, &da903x_backlight_ops);
        if (IS_ERR(bl)) {

diff --git a/include/linux/mfd/da903x.h b/include/linux/mfd/da903x.h
index c63b65c..0aa3a1a 100644 (file)
--- a/include/linux/mfd/da903x.h
+++ b/include/linux/mfd/da903x.h
@@ -96,6 +96,10 @@ struct da9034_touch_pdata {
        int     y_inverted;
 };
 
+struct da9034_backlight_pdata {
+       int     output_current; /* output current of WLED, from 0-31 (in mA) */
+};
+
 /* DA9030 battery charger data */
 struct power_supply_info;