[media] v4l2: standardize log start/end message

For drivers that properly use the v4l2 framework (i.e. set v4l2_dev in the
video_device struct), the start and end messages of VIDIOC_LOG_STATUS are
now generated automatically. People tended to forget these, but the v4l2-ctl
tool scans for these messages, and it also makes it easier to read the status
output in the kernel log.

The cx18, ivtv and bttv drivers were changed since they no longer need to
log these start/end messages.

In saa7164 two empty log_status functions were removed.

Also added a helper function to v4l2-ctrl.c that can be used as the
vidioc_log_status callback if all you need to do is to log the current control
values. This is now used by pwc and vivi.

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Cc: Steven Toth <stoth@kernellabs.com>
Cc: Andy Walls <awalls@md.metrocast.net>
Cc: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

10 files changed, 24 insertions, 43 deletions

diff --git a/drivers/media/video/bt8xx/bttv-driver.c b/drivers/media/video/bt8xx/bttv-driver.c
index 76c301f0509..e581b37be78 100644
--- a/drivers/media/video/bt8xx/bttv-driver.c
+++ b/drivers/media/video/bt8xx/bttv-driver.c
@@ -2035,11 +2035,7 @@ static int bttv_log_status(struct file *file, void *f)
 	struct bttv_fh *fh  = f;
 	struct bttv *btv = fh->btv;
 
-	pr_info("%d: ========  START STATUS CARD #%d  ========\n",
-		btv->c.nr, btv->c.nr);
 	bttv_call_all(btv, core, log_status);
-	pr_info("%d: ========  END STATUS CARD   #%d  ========\n",
-		btv->c.nr, btv->c.nr);
 	return 0;
 }
 
diff --git a/drivers/media/video/cx18/cx18-ioctl.c b/drivers/media/video/cx18/cx18-ioctl.c
index 66b1c15c354..be49f68ddf3 100644
--- a/drivers/media/video/cx18/cx18-ioctl.c
+++ b/drivers/media/video/cx18/cx18-ioctl.c
@@ -1085,8 +1085,6 @@ static int cx18_log_status(struct file *file, void *fh)
 	struct v4l2_audio audin;
 	int i;
 
-	CX18_INFO("=================  START STATUS CARD #%d  "
-		  "=================\n", cx->instance);
 	CX18_INFO("Version: %s  Card: %s\n", CX18_VERSION, cx->card_name);
 	if (cx->hw_flags & CX18_HW_TVEEPROM) {
 		struct tveeprom tv;
@@ -1120,8 +1118,6 @@ static int cx18_log_status(struct file *file, void *fh)
 	CX18_INFO("Read MPEG/VBI: %lld/%lld bytes\n",
 			(long long)cx->mpg_data_received,
 			(long long)cx->vbi_data_inserted);
-	CX18_INFO("==================  END STATUS CARD #%d  "
-		  "==================\n", cx->instance);
 	return 0;
 }
 
diff --git a/drivers/media/video/ivtv/ivtv-ioctl.c b/drivers/media/video/ivtv/ivtv-ioctl.c
index 37ac32b53ba..385e003fcfb 100644
--- a/drivers/media/video/ivtv/ivtv-ioctl.c
+++ b/drivers/media/video/ivtv/ivtv-ioctl.c
@@ -1485,8 +1485,6 @@ static int ivtv_log_status(struct file *file, void *fh)
 	struct v4l2_audio audin;
 	int i;
 
-	IVTV_INFO("=================  START STATUS CARD #%d  =================\n",
-		       itv->instance);
 	IVTV_INFO("Version: %s Card: %s\n", IVTV_VERSION, itv->card_name);
 	if (itv->hw_flags & IVTV_HW_TVEEPROM) {
 		struct tveeprom tv;
@@ -1568,9 +1566,6 @@ static int ivtv_log_status(struct file *file, void *fh)
 	IVTV_INFO("Read MPG/VBI: %lld/%lld bytes\n",
 			(long long)itv->mpg_data_received,
 			(long long)itv->vbi_data_inserted);
-	IVTV_INFO("==================  END STATUS CARD #%d  ==================\n",
-			itv->instance);
-
 	return 0;
 }
 
diff --git a/drivers/media/video/pwc/pwc-v4l.c b/drivers/media/video/pwc/pwc-v4l.c
index f495eeb5403..2834e3e65b3 100644
--- a/drivers/media/video/pwc/pwc-v4l.c
+++ b/drivers/media/video/pwc/pwc-v4l.c
@@ -1146,14 +1146,6 @@ leave:
 	return ret;
 }
 
-static int pwc_log_status(struct file *file, void *priv)
-{
-	struct pwc_device *pdev = video_drvdata(file);
-
-	v4l2_ctrl_handler_log_status(&pdev->ctrl_handler, PWC_NAME);
-	return 0;
-}
-
 const struct v4l2_ioctl_ops pwc_ioctl_ops = {
 	.vidioc_querycap		    = pwc_querycap,
 	.vidioc_enum_input		    = pwc_enum_input,
@@ -1169,7 +1161,7 @@ const struct v4l2_ioctl_ops pwc_ioctl_ops = {
 	.vidioc_dqbuf			    = pwc_dqbuf,
 	.vidioc_streamon		    = pwc_streamon,
 	.vidioc_streamoff		    = pwc_streamoff,
-	.vidioc_log_status		    = pwc_log_status,
+	.vidioc_log_status		    = v4l2_ctrl_log_status,
 	.vidioc_enum_framesizes		    = pwc_enum_framesizes,
 	.vidioc_enum_frameintervals	    = pwc_enum_frameintervals,
 	.vidioc_g_parm			    = pwc_g_parm,
diff --git a/drivers/media/video/saa7164/saa7164-encoder.c b/drivers/media/video/saa7164/saa7164-encoder.c
index 2fd38a01887..a9ed686ad08 100644
--- a/drivers/media/video/saa7164/saa7164-encoder.c
+++ b/drivers/media/video/saa7164/saa7164-encoder.c
@@ -791,11 +791,6 @@ static int vidioc_s_fmt_vid_cap(struct file *file, void *priv,
 	return 0;
 }
 
-static int vidioc_log_status(struct file *file, void *priv)
-{
-	return 0;
-}
-
 static int fill_queryctrl(struct saa7164_encoder_params *params,
 	struct v4l2_queryctrl *c)
 {
@@ -1347,7 +1342,6 @@ static const struct v4l2_ioctl_ops mpeg_ioctl_ops = {
 	.vidioc_g_ext_ctrls	 = vidioc_g_ext_ctrls,
 	.vidioc_s_ext_ctrls	 = vidioc_s_ext_ctrls,
 	.vidioc_try_ext_ctrls	 = vidioc_try_ext_ctrls,
-	.vidioc_log_status	 = vidioc_log_status,
 	.vidioc_queryctrl	 = vidioc_queryctrl,
 	.vidioc_g_chip_ident	 = saa7164_g_chip_ident,
 #ifdef CONFIG_VIDEO_ADV_DEBUG
diff --git a/drivers/media/video/saa7164/saa7164-vbi.c b/drivers/media/video/saa7164/saa7164-vbi.c
index e2e03415871..273cf807401 100644
--- a/drivers/media/video/saa7164/saa7164-vbi.c
+++ b/drivers/media/video/saa7164/saa7164-vbi.c
@@ -730,11 +730,6 @@ static int vidioc_s_fmt_vid_cap(struct file *file, void *priv,
 	return 0;
 }
 
-static int vidioc_log_status(struct file *file, void *priv)
-{
-	return 0;
-}
-
 static int fill_queryctrl(struct saa7164_vbi_params *params,
 	struct v4l2_queryctrl *c)
 {
@@ -1256,7 +1251,6 @@ static const struct v4l2_ioctl_ops vbi_ioctl_ops = {
 	.vidioc_g_ext_ctrls	 = vidioc_g_ext_ctrls,
 	.vidioc_s_ext_ctrls	 = vidioc_s_ext_ctrls,
 	.vidioc_try_ext_ctrls	 = vidioc_try_ext_ctrls,
-	.vidioc_log_status	 = vidioc_log_status,
 	.vidioc_queryctrl	 = vidioc_queryctrl,
 #if 0
 	.vidioc_g_chip_ident	 = saa7164_g_chip_ident,
diff --git a/drivers/media/video/v4l2-ctrls.c b/drivers/media/video/v4l2-ctrls.c
index 94fbb5b50c7..7d58e4d420c 100644
--- a/drivers/media/video/v4l2-ctrls.c
+++ b/drivers/media/video/v4l2-ctrls.c
@@ -2382,3 +2382,15 @@ void v4l2_ctrl_del_event(struct v4l2_ctrl *ctrl,
 	v4l2_ctrl_unlock(ctrl);
 }
 EXPORT_SYMBOL(v4l2_ctrl_del_event);
+
+int v4l2_ctrl_log_status(struct file *file, void *fh)
+{
+	struct video_device *vfd = video_devdata(file);
+	struct v4l2_fh *vfh = file->private_data;
+
+	if (test_bit(V4L2_FL_USES_V4L2_FH, &vfd->flags) && vfd->v4l2_dev)
+		v4l2_ctrl_handler_log_status(vfh->ctrl_handler,
+			vfd->v4l2_dev->name);
+	return 0;
+}
+EXPORT_SYMBOL(v4l2_ctrl_log_status);
diff --git a/drivers/media/video/v4l2-ioctl.c b/drivers/media/video/v4l2-ioctl.c
index a288ee6fd45..74cab51a66e 100644
--- a/drivers/media/video/v4l2-ioctl.c
+++ b/drivers/media/video/v4l2-ioctl.c
@@ -1939,7 +1939,13 @@ static long __video_do_ioctl(struct file *file,
 	{
 		if (!ops->vidioc_log_status)
 			break;
+		if (vfd->v4l2_dev)
+			pr_info("%s: =================  START STATUS  =================\n",
+				vfd->v4l2_dev->name);
 		ret = ops->vidioc_log_status(file, fh);
+		if (vfd->v4l2_dev)
+			pr_info("%s: ==================  END STATUS  ==================\n",
+				vfd->v4l2_dev->name);
 		break;
 	}
 #ifdef CONFIG_VIDEO_ADV_DEBUG
diff --git a/drivers/media/video/vivi.c b/drivers/media/video/vivi.c
index 5578c195358..64a3b5276cc 100644
--- a/drivers/media/video/vivi.c
+++ b/drivers/media/video/vivi.c
@@ -959,14 +959,6 @@ static int vidioc_streamoff(struct file *file, void *priv, enum v4l2_buf_type i)
 	return vb2_streamoff(&dev->vb_vidq, i);
 }
 
-static int vidioc_log_status(struct file *file, void *priv)
-{
-	struct vivi_dev *dev = video_drvdata(file);
-
-	v4l2_ctrl_handler_log_status(&dev->ctrl_handler, dev->v4l2_dev.name);
-	return 0;
-}
-
 static int vidioc_s_std(struct file *file, void *priv, v4l2_std_id *i)
 {
 	return 0;
@@ -1210,7 +1202,7 @@ static const struct v4l2_ioctl_ops vivi_ioctl_ops = {
 	.vidioc_s_input       = vidioc_s_input,
 	.vidioc_streamon      = vidioc_streamon,
 	.vidioc_streamoff     = vidioc_streamoff,
-	.vidioc_log_status    = vidioc_log_status,
+	.vidioc_log_status    = v4l2_ctrl_log_status,
 	.vidioc_subscribe_event = vidioc_subscribe_event,
 	.vidioc_unsubscribe_event = v4l2_event_unsubscribe,
 };
diff --git a/include/media/v4l2-ctrls.h b/include/media/v4l2-ctrls.h
index eeb3df63714..5f246c277ff 100644
--- a/include/media/v4l2-ctrls.h
+++ b/include/media/v4l2-ctrls.h
@@ -492,6 +492,10 @@ void v4l2_ctrl_add_event(struct v4l2_ctrl *ctrl,
 void v4l2_ctrl_del_event(struct v4l2_ctrl *ctrl,
 		struct v4l2_subscribed_event *sev);
 
+/* Can be used as a vidioc_log_status function that just dumps all controls
+   associated with the filehandle. */
+int v4l2_ctrl_log_status(struct file *file, void *fh);
+
 /* Helpers for ioctl_ops. If hdl == NULL then they will all return -EINVAL. */
 int v4l2_queryctrl(struct v4l2_ctrl_handler *hdl, struct v4l2_queryctrl *qc);
 int v4l2_querymenu(struct v4l2_ctrl_handler *hdl, struct v4l2_querymenu *qm);