backlight: da903x_bl: control WLED output current in da9034

Update WLED output current source before changing brightness.

Signed-off-by: Haojian Zhuang <[e-mail]>
Signed-off-by: Eric Miao <[e-mail]>

drivers/video/backlight/da903x_bl.c

···
 
 #define DA9034_WLED_CONTROL1	0x3C
 #define DA9034_WLED_CONTROL2	0x3D
+#define DA9034_WLED_ISET(x)	((x) & 0x1f)
 
 #define DA9034_WLED_BOOST_EN	(1 << 5)
 
···
 
 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;
···
 	data->id = pdev->id;
 	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);

include/linux/mfd/da903x.h

···
 	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;