V4L/DVB (11451): gspca - m5602-s5k83a: Add rotation, ctrl cache. Rename some ctrls.

s5k83a sensor mounted on many acer laptops have a swiwel allowing it to be rotated. When the camera is in its rotated state, the image needs to be flipped. The only way to check for if the camera has been flipped is to continously poll a register in the m5602. This patch creates a kernel thread which does this. This patch renames some v4l2 ctrls and finally implements a cache in order to prevent unnecessary sensor reads.
Signed-off-by: Luk?? 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

@@ -80,6 +80,16 @@ int m5602_write_bridge(struct sd *sd, u8 address, u8 i2c_data)
 	return (err < 0) ? err : 0;
 }
 
+int m5602_wait_for_i2c(struct sd *sd)
+{
+	int err;
+	u8 data;
+	do {
+		err = m5602_read_bridge(sd, M5602_XB_I2C_STATUS, &data);
+	} while ((data & I2C_BUSY) && !err);
+	return (err < 0) ? err : 0;
+}
+
 int m5602_read_sensor(struct sd *sd, const u8 address,
 		       u8 *i2c_data, const u8 len)
 {
@@ -88,9 +98,7 @@ int m5602_read_sensor(struct sd *sd, const u8 address,
 	if (!len || len > sd->sensor->i2c_regW)
 		return -EINVAL;
 
-	do {
-		err = m5602_read_bridge(sd, M5602_XB_I2C_STATUS, i2c_data);
-	} while ((*i2c_data & I2C_BUSY) && !err);
+	err = m5602_wait_for_i2c(sd);
 	if (err < 0)
 		return err;
 
@@ -118,6 +126,10 @@ int m5602_read_sensor(struct sd *sd, const u8 address,
 	}
 
 	for (i = 0; (i < len) && !err; i++) {
+		err = m5602_wait_for_i2c(sd);
+		if (err < 0)
+			return err;
+
 		err = m5602_read_bridge(sd, M5602_XB_I2C_DATA, &(i2c_data[i]));
 
 		PDEBUG(D_CONF, "Reading sensor register "

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

@@ -24,17 +24,18 @@
 #define S5K83A_FLIP			0x01
 #define S5K83A_HFLIP_TUNE		0x03
 #define S5K83A_VFLIP_TUNE		0x05
-#define S5K83A_WHITENESS			0x0a
-#define S5K83A_GAIN				0x18
-#define S5K83A_BRIGHTNESS			0x1b
+#define S5K83A_BRIGHTNESS		0x0a
+#define S5K83A_EXPOSURE			0x18
+#define S5K83A_GAIN			0x1b
 #define S5K83A_PAGE_MAP			0xec
 
-#define S5K83A_DEFAULT_BRIGHTNESS		0x71
-#define S5K83A_DEFAULT_WHITENESS		0x7e
-#define S5K83A_DEFAULT_GAIN			0x00
-#define S5K83A_MAXIMUM_GAIN			0x3c
+#define S5K83A_DEFAULT_GAIN		0x71
+#define S5K83A_DEFAULT_BRIGHTNESS	0x7e
+#define S5K83A_DEFAULT_EXPOSURE		0x00
+#define S5K83A_MAXIMUM_EXPOSURE		0x3c
 #define S5K83A_FLIP_MASK		0x10
 #define S5K83A_GPIO_LED_MASK		0x10
+#define S5K83A_GPIO_ROTATION_MASK 	0x40
 
 /*****************************************************************************/
 
@@ -47,15 +48,14 @@ 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);
+void s5k83a_disconnect(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);
-int s5k83a_get_whiteness(struct gspca_dev *gspca_dev, __s32 *val);
 int s5k83a_set_gain(struct gspca_dev *gspca_dev, __s32 val);
 int s5k83a_get_gain(struct gspca_dev *gspca_dev, __s32 *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_exposure(struct gspca_dev *gspca_dev, __s32 val);
+int s5k83a_get_exposure(struct gspca_dev *gspca_dev, __s32 *val);
 int s5k83a_get_vflip(struct gspca_dev *gspca_dev, __s32 *val);
 int s5k83a_set_vflip(struct gspca_dev *gspca_dev, __s32 val);
 int s5k83a_get_hflip(struct gspca_dev *gspca_dev, __s32 *val);
@@ -68,10 +68,18 @@ static const struct m5602_sensor s5k83a = {
 	.start = s5k83a_start,
 	.stop = s5k83a_stop,
 	.power_down = s5k83a_power_down,
+	.disconnect = s5k83a_disconnect,
 	.i2c_slave_id = 0x5a,
 	.i2c_regW = 2,
 };
 
+struct s5k83a_priv {
+	/* We use another thread periodically
+	   probing the orientation of the camera */
+	struct task_struct *rotation_thread;
+	s32 *settings;
+};
+
 static const unsigned char preinit_s5k83a[][4] =
 {
 	{BRIDGE, M5602_XB_MCU_CLK_DIV, 0x02, 0x00},
@@ -125,7 +133,7 @@ static const unsigned char init_s5k83a[][4] =
 	{SENSOR, 0x01, 0x50, 0x00},
 	{SENSOR, 0x12, 0x20, 0x00},
 	{SENSOR, 0x17, 0x40, 0x00},
-	{SENSOR, S5K83A_BRIGHTNESS, 0x0f, 0x00},
+	{SENSOR, S5K83A_GAIN, 0x0f, 0x00},
 	{SENSOR, 0x1c, 0x00, 0x00},
 	{SENSOR, 0x02, 0x70, 0x00},
 	{SENSOR, 0x03, 0x0b, 0x00},
@@ -232,7 +240,7 @@ static const unsigned char init_s5k83a[][4] =
 	{SENSOR, 0x01, 0x50, 0x00},
 	{SENSOR, 0x12, 0x20, 0x00},
 	{SENSOR, 0x17, 0x40, 0x00},
-	{SENSOR, S5K83A_BRIGHTNESS, 0x0f, 0x00},
+	{SENSOR, S5K83A_GAIN, 0x0f, 0x00},
 	{SENSOR, 0x1c, 0x00, 0x00},
 	{SENSOR, 0x02, 0x70, 0x00},
 	/* some values like 0x10 give a blue-purple image */
@@ -320,7 +328,7 @@ static const unsigned char init_s5k83a[][4] =
 	{SENSOR, 0x01, 0x50, 0x00},
 	{SENSOR, 0x12, 0x20, 0x00},
 	{SENSOR, 0x17, 0x40, 0x00},
-	{SENSOR, S5K83A_BRIGHTNESS, 0x0f, 0x00},
+	{SENSOR, S5K83A_GAIN, 0x0f, 0x00},
 	{SENSOR, 0x1c, 0x00, 0x00},
 	{SENSOR, 0x02, 0x70, 0x00},
 	{SENSOR, 0x03, 0x0b, 0x00},
@@ -374,24 +382,23 @@ static const unsigned char init_s5k83a[][4] =
 	   (this is value after boot, but after tries can be different) */
 	{SENSOR, 0x00, 0x06, 0x00},
 
-	/* set default brightness */
+	/* set default gain */
 	{SENSOR_LONG, 0x14, 0x00, 0x20},
 	{SENSOR_LONG, 0x0d, 0x01, 0x00},
-	{SENSOR_LONG, 0x1b, S5K83A_DEFAULT_BRIGHTNESS >> 3,
-			    S5K83A_DEFAULT_BRIGHTNESS >> 1},
+	{SENSOR_LONG, 0x1b, S5K83A_DEFAULT_GAIN >> 3,
+		S5K83A_DEFAULT_GAIN >> 1},
 
-	/* set default whiteness */
-	{SENSOR, S5K83A_WHITENESS, S5K83A_DEFAULT_WHITENESS, 0x00},
+	/* set default brightness */
+	{SENSOR, S5K83A_BRIGHTNESS, S5K83A_DEFAULT_BRIGHTNESS, 0x00},
 
-	/* set default gain */
-	{SENSOR_LONG, 0x18, 0x00, S5K83A_DEFAULT_GAIN},
+	/* set default exposure */
+	{SENSOR_LONG, 0x18, 0x00, S5K83A_DEFAULT_EXPOSURE},
 
 	/* set default flip */
 	{SENSOR, S5K83A_PAGE_MAP, 0x05, 0x00},
 	{SENSOR, S5K83A_FLIP, 0x00 | S5K83A_FLIP_MASK, 0x00},
 	{SENSOR, S5K83A_HFLIP_TUNE, 0x0b, 0x00},
 	{SENSOR, S5K83A_VFLIP_TUNE, 0x0a, 0x00}
-
 };
 
 #endif