V4L/DVB (11408): gspca - m5602-s5k83a: Add led support to the s5k83a sensor.

This patch toggles the led seen on many laptops having a m5602 connected
to a Samsung s5k83a sensor.
Signed-off-by: Lukas Karas <lukas.karas@centrum.cz>
Signed-off-by: Erik Andr?n <erik.andren@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/video/gspca/m5602/m5602_core.c

@@ -309,7 +309,11 @@ static void m5602_urb_complete(struct gspca_dev *gspca_dev,
 
 static void m5602_stop_transfer(struct gspca_dev *gspca_dev)
 {
-	/* Is there are a command to stop a data transfer? */
+	struct sd *sd = (struct sd *) gspca_dev;
+
+	/* Run the sensor specific end transfer sequence */
+	if (sd->sensor->stop)
+		sd->sensor->stop(sd);
 }
 
 /* sub-driver description, the ctrl and nctrl is filled at probe time */

drivers/media/video/gspca/m5602/m5602_s5k83a.c

@@ -108,6 +108,16 @@ int s5k83a_init(struct sd *sd)
 	return (err < 0) ? err : 0;
 }
 
+int s5k83a_start(struct sd *sd)
+{
+	return s5k83a_set_led_indication(sd, 1);
+}
+
+int s5k83a_stop(struct sd *sd)
+{
+	return s5k83a_set_led_indication(sd, 0);
+}
+
 int s5k83a_power_down(struct sd *sd)
 {
 	return 0;
@@ -345,3 +355,22 @@ int s5k83a_set_hflip(struct gspca_dev *gspca_dev, __s32 val)
 
 	return err;
 }
+
+int s5k83a_set_led_indication(struct sd *sd, u8 val)
+{
+	int err = 0;
+	u8 data[1];
+
+	err = m5602_read_bridge(sd, M5602_XB_GPIO_DAT, data);
+	if (err < 0)
+		return err;
+
+	if (val)
+		data[0] = data[0] | S5K83A_GPIO_LED_MASK;
+	else
+		data[0] = data[0] & ~S5K83A_GPIO_LED_MASK;
+
+	err = m5602_write_bridge(sd, M5602_XB_GPIO_DAT, data[0]);
+
+	return (err < 0) ? err : 0;
+}

drivers/media/video/gspca/m5602/m5602_s5k83a.h

@@ -34,7 +34,7 @@
 #define S5K83A_DEFAULT_GAIN			0x00
 #define S5K83A_MAXIMUM_GAIN			0x3c
 #define S5K83A_FLIP_MASK			0x10
-
+#define S5K83A_GPIO_LED_MASK		0x10
 
 /*****************************************************************************/
 
@@ -44,8 +44,12 @@ extern int dump_sensor;
 
 int s5k83a_probe(struct sd *sd);
 int s5k83a_init(struct sd *sd);
+int s5k83a_start(struct sd *sd);
+int s5k83a_stop(struct sd *sd);
 int s5k83a_power_down(struct sd *sd);
 
+int s5k83a_set_led_indication(struct sd *sd, u8 val);
+
 int s5k83a_set_brightness(struct gspca_dev *gspca_dev, __s32 val);
 int s5k83a_get_brightness(struct gspca_dev *gspca_dev, __s32 *val);
 int s5k83a_set_whiteness(struct gspca_dev *gspca_dev, __s32 val);
@@ -61,6 +65,8 @@ static struct m5602_sensor s5k83a = {
 	.name = "S5K83A",
 	.probe = s5k83a_probe,
 	.init = s5k83a_init,
+	.start = s5k83a_start,
+	.stop = s5k83a_stop,
 	.power_down = s5k83a_power_down,
 	.i2c_slave_id = 0x5a,
 	.i2c_regW = 2,
@@ -381,7 +387,7 @@ static const unsigned char init_s5k83a[][4] =
 	{BRIDGE, M5602_XB_SEN_CLK_DIV, 0x00, 0x00},
 	{BRIDGE, M5602_XB_SEN_CLK_CTRL, 0xf0, 0x00},
 	{BRIDGE, M5602_XB_GPIO_DIR, 0x1d, 0x00},
-	{BRIDGE, M5602_XB_GPIO_DAT, 0x1c, 0x00},
+	{BRIDGE, M5602_XB_GPIO_DAT, 0x08, 0x00},
 	{BRIDGE, M5602_XB_GPIO_EN_H, 0x06, 0x00},
 	{BRIDGE, M5602_XB_GPIO_DIR_H, 0x06, 0x00},
 	{BRIDGE, M5602_XB_GPIO_DAT_H, 0x00, 0x00},

drivers/media/video/gspca/m5602/m5602_sensor.h

@@ -61,6 +61,9 @@ struct m5602_sensor {
 	/* Executed when the camera starts to send data */
 	int (*start)(struct sd *sd);
 
+	/* Executed when the camera ends to send data */
+	int (*stop)(struct sd *sd);
+
 	/* Performs a power down sequence */
 	int (*power_down)(struct sd *sd);