V4L/DVB (12415): radio-si470x: add disconnect check function

The si470x_disconnect_check is function to check disconnect state of
radio in common file. The function is implemented in each interface
file.
Signed-off-by: Joonyoung Shim <jy0922.shim@samsung.com>
Signed-off-by: Tobias Lorenz <tobias.lorenz@gmx.net>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/radio/si470x/radio-si470x-common.c

@@ -475,10 +475,9 @@ static int si470x_vidioc_g_ctrl(struct file *file, void *priv,
 	int retval = 0;
 
 	/* safety checks */
-	if (radio->disconnected) {
-		retval = -EIO;
+	retval = si470x_disconnect_check(radio);
+	if (retval)
 		goto done;
-	}
 
 	switch (ctrl->id) {
 	case V4L2_CID_AUDIO_VOLUME:
@@ -511,10 +510,9 @@ static int si470x_vidioc_s_ctrl(struct file *file, void *priv,
 	int retval = 0;
 
 	/* safety checks */
-	if (radio->disconnected) {
-		retval = -EIO;
+	retval = si470x_disconnect_check(radio);
+	if (retval)
 		goto done;
-	}
 
 	switch (ctrl->id) {
 	case V4L2_CID_AUDIO_VOLUME:
@@ -567,10 +565,10 @@ static int si470x_vidioc_g_tuner(struct file *file, void *priv,
 	int retval = 0;
 
 	/* safety checks */
-	if (radio->disconnected) {
-		retval = -EIO;
+	retval = si470x_disconnect_check(radio);
+	if (retval)
 		goto done;
-	}
+
 	if (tuner->index != 0) {
 		retval = -EINVAL;
 		goto done;
@@ -649,10 +647,10 @@ static int si470x_vidioc_s_tuner(struct file *file, void *priv,
 	int retval = -EINVAL;
 
 	/* safety checks */
-	if (radio->disconnected) {
-		retval = -EIO;
+	retval = si470x_disconnect_check(radio);
+	if (retval)
 		goto done;
-	}
+
 	if (tuner->index != 0)
 		goto done;
 
@@ -688,10 +686,10 @@ static int si470x_vidioc_g_frequency(struct file *file, void *priv,
 	int retval = 0;
 
 	/* safety checks */
-	if (radio->disconnected) {
-		retval = -EIO;
+	retval = si470x_disconnect_check(radio);
+	if (retval)
 		goto done;
-	}
+
 	if (freq->tuner != 0) {
 		retval = -EINVAL;
 		goto done;
@@ -718,10 +716,10 @@ static int si470x_vidioc_s_frequency(struct file *file, void *priv,
 	int retval = 0;
 
 	/* safety checks */
-	if (radio->disconnected) {
-		retval = -EIO;
+	retval = si470x_disconnect_check(radio);
+	if (retval)
 		goto done;
-	}
+
 	if (freq->tuner != 0) {
 		retval = -EINVAL;
 		goto done;
@@ -747,10 +745,10 @@ static int si470x_vidioc_s_hw_freq_seek(struct file *file, void *priv,
 	int retval = 0;
 
 	/* safety checks */
-	if (radio->disconnected) {
-		retval = -EIO;
+	retval = si470x_disconnect_check(radio);
+	if (retval)
 		goto done;
-	}
+
 	if (seek->tuner != 0) {
 		retval = -EINVAL;
 		goto done;

drivers/media/radio/si470x/radio-si470x-usb.c

@@ -370,6 +370,23 @@ static int si470x_get_scratch_page_versions(struct si470x_device *radio)
 
 
 
+/**************************************************************************
+ * General Driver Functions - DISCONNECT_CHECK
+ **************************************************************************/
+
+/*
+ * si470x_disconnect_check - check whether radio disconnects
+ */
+int si470x_disconnect_check(struct si470x_device *radio)
+{
+	if (radio->disconnected)
+		return -EIO;
+	else
+		return 0;
+}
+
+
+
 /**************************************************************************
  * RDS Driver Functions
  **************************************************************************/

drivers/media/radio/si470x/radio-si470x.h

@@ -193,6 +193,7 @@ extern const struct v4l2_file_operations si470x_fops;
 extern struct video_device si470x_viddev_template;
 int si470x_get_register(struct si470x_device *radio, int regnr);
 int si470x_set_register(struct si470x_device *radio, int regnr);
+int si470x_disconnect_check(struct si470x_device *radio);
 int si470x_set_freq(struct si470x_device *radio, unsigned int freq);
 int si470x_start(struct si470x_device *radio);
 int si470x_stop(struct si470x_device *radio);