[media] vicam: convert to the control framework

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/video/gspca/vicam.c

@@ -44,17 +44,10 @@ MODULE_DESCRIPTION("GSPCA ViCam USB Camera Driver");
 MODULE_LICENSE("GPL");
 MODULE_FIRMWARE(VICAM_FIRMWARE);
 
-enum e_ctrl {
-	GAIN,
-	EXPOSURE,
-	NCTRL		/* number of controls */
-};
-
 struct sd {
 	struct gspca_dev gspca_dev;	/* !! must be the first item */
 	struct work_struct work_struct;
 	struct workqueue_struct *work_thread;
-	struct gspca_ctrl ctrls[NCTRL];
 };
 
 /* The vicam sensor has a resolution of 512 x 244, with I believe square
@@ -86,31 +79,6 @@ static struct v4l2_pix_format vicam_mode[] = {
 		.colorspace = V4L2_COLORSPACE_SRGB,},
 };
 
-static const struct ctrl sd_ctrls[] = {
-[GAIN] = {
-	    {
-		.id      = V4L2_CID_GAIN,
-		.type    = V4L2_CTRL_TYPE_INTEGER,
-		.name    = "Gain",
-		.minimum = 0,
-		.maximum = 255,
-		.step    = 1,
-		.default_value = 200,
-	    },
-	},
-[EXPOSURE] = {
-	    {
-		.id      = V4L2_CID_EXPOSURE,
-		.type    = V4L2_CTRL_TYPE_INTEGER,
-		.name    = "Exposure",
-		.minimum = 0,
-		.maximum = 2047,
-		.step    = 1,
-		.default_value = 256,
-	    },
-	},
-};
-
 static int vicam_control_msg(struct gspca_dev *gspca_dev, u8 request,
 	u16 value, u16 index, u8 *data, u16 len)
 {
@@ -146,12 +114,13 @@ static int vicam_set_camera_power(struct gspca_dev *gspca_dev, int state)
  */
 static int vicam_read_frame(struct gspca_dev *gspca_dev, u8 *data, int size)
 {
-	struct sd *sd = (struct sd *)gspca_dev;
 	int ret, unscaled_height, act_len = 0;
 	u8 *req_data = gspca_dev->usb_buf;
+	s32 expo = v4l2_ctrl_g_ctrl(gspca_dev->exposure);
+	s32 gain = v4l2_ctrl_g_ctrl(gspca_dev->gain);
 
 	memset(req_data, 0, 16);
-	req_data[0] = sd->ctrls[GAIN].val;
+	req_data[0] = gain;
 	if (gspca_dev->width == 256)
 		req_data[1] |= 0x01; /* low nibble x-scale */
 	if (gspca_dev->height <= 122) {
@@ -167,9 +136,9 @@ static int vicam_read_frame(struct gspca_dev *gspca_dev, u8 *data, int size)
 	else /* Up to 244 lines with req_data[3] == 0x08 */
 		req_data[3] = 0x08; /* vend? */
 
-	if (sd->ctrls[EXPOSURE].val < 256) {
+	if (expo < 256) {
 		/* Frame rate maxed out, use partial frame expo time */
-		req_data[4] = 255 - sd->ctrls[EXPOSURE].val;
+		req_data[4] = 255 - expo;
 		req_data[5] = 0x00;
 		req_data[6] = 0x00;
 		req_data[7] = 0x01;
@@ -177,8 +146,8 @@ static int vicam_read_frame(struct gspca_dev *gspca_dev, u8 *data, int size)
 		/* Modify frame rate */
 		req_data[4] = 0x00;
 		req_data[5] = 0x00;
-		req_data[6] = sd->ctrls[EXPOSURE].val & 0xFF;
-		req_data[7] = sd->ctrls[EXPOSURE].val >> 8;
+		req_data[6] = expo & 0xFF;
+		req_data[7] = expo >> 8;
 	}
 	req_data[8] = ((244 - unscaled_height) / 2) & ~0x01; /* vstart */
 	/* bytes 9-15 do not seem to affect exposure or image quality */
@@ -260,7 +229,6 @@ static int sd_config(struct gspca_dev *gspca_dev,
 	cam->bulk_size = 64;
 	cam->cam_mode = vicam_mode;
 	cam->nmodes = ARRAY_SIZE(vicam_mode);
-	cam->ctrls = sd->ctrls;
 
 	INIT_WORK(&sd->work_struct, vicam_dostream);
 
@@ -335,6 +303,24 @@ static void sd_stop0(struct gspca_dev *gspca_dev)
 		vicam_set_camera_power(gspca_dev, 0);
 }
 
+static int sd_init_controls(struct gspca_dev *gspca_dev)
+{
+	struct v4l2_ctrl_handler *hdl = &gspca_dev->ctrl_handler;
+
+	gspca_dev->vdev.ctrl_handler = hdl;
+	v4l2_ctrl_handler_init(hdl, 2);
+	gspca_dev->exposure = v4l2_ctrl_new_std(hdl, NULL,
+			V4L2_CID_EXPOSURE, 0, 2047, 1, 256);
+	gspca_dev->gain = v4l2_ctrl_new_std(hdl, NULL,
+			V4L2_CID_GAIN, 0, 255, 1, 200);
+
+	if (hdl->error) {
+		pr_err("Could not initialize controls\n");
+		return hdl->error;
+	}
+	return 0;
+}
+
 /* Table of supported USB devices */
 static const struct usb_device_id device_table[] = {
 	{USB_DEVICE(0x04c1, 0x009d)},
@@ -347,10 +333,9 @@ MODULE_DEVICE_TABLE(usb, device_table);
 /* sub-driver description */
 static const struct sd_desc sd_desc = {
 	.name   = MODULE_NAME,
-	.ctrls  = sd_ctrls,
-	.nctrls = ARRAY_SIZE(sd_ctrls),
 	.config = sd_config,
 	.init   = sd_init,
+	.init_controls = sd_init_controls,
 	.start  = sd_start,
 	.stop0  = sd_stop0,
 };