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>

1 files changed, 15 insertions, 3 deletions

diff --git a/drivers/media/video/gspca/m5602/m5602_core.c b/drivers/media/video/gspca/m5602/m5602_core.c
index 1aac298..93302f3 100644
--- a/drivers/media/video/gspca/m5602/m5602_core.c
+++ b/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 "