* [PATCH v5 1/3] media: uvcvideo: Only create input devs if hw supports it
@ 2022-02-04 17:10 Ricardo Ribalda
2022-02-04 17:10 ` [PATCH v5 2/3] media: uvcvideo: Refactor streamon/streamoff Ricardo Ribalda
2022-02-04 17:10 ` [PATCH v5 3/3] media: uvcvideo: Do power management granularly Ricardo Ribalda
0 siblings, 2 replies; 3+ messages in thread
From: Ricardo Ribalda @ 2022-02-04 17:10 UTC (permalink / raw)
To: Laurent Pinchart, Mauro Carvalho Chehab, linux-media,
linux-kernel, Tomasz Figa, Sergey Senozhatsky
Cc: Ricardo Ribalda
Examine the stream headers to figure out if the device has a button and
can be used as an input.
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Ricardo Ribalda <ribalda@chromium.org>
---
drivers/media/usb/uvc/uvc_status.c | 23 +++++++++++++++++++++++
1 file changed, 23 insertions(+)
diff --git a/drivers/media/usb/uvc/uvc_status.c b/drivers/media/usb/uvc/uvc_status.c
index 753c8226db70..6149bfafd1cc 100644
--- a/drivers/media/usb/uvc/uvc_status.c
+++ b/drivers/media/usb/uvc/uvc_status.c
@@ -18,11 +18,34 @@
* Input device
*/
#ifdef CONFIG_USB_VIDEO_CLASS_INPUT_EVDEV
+
+static bool uvc_input_has_button(struct uvc_device *dev)
+{
+ struct uvc_streaming *stream;
+
+ /*
+ * The device has button events if both bTriggerSupport and
+ * bTriggerUsage are one. Otherwise the camera button does not
+ * exist or is handled automatically by the camera without host
+ * driver or client application intervention.
+ */
+ list_for_each_entry(stream, &dev->streams, list) {
+ if (stream->header.bTriggerSupport == 1 &&
+ stream->header.bTriggerUsage == 1)
+ return true;
+ }
+
+ return false;
+}
+
static int uvc_input_init(struct uvc_device *dev)
{
struct input_dev *input;
int ret;
+ if (!uvc_input_has_button(dev))
+ return 0;
+
input = input_allocate_device();
if (input == NULL)
return -ENOMEM;
--
2.35.0.263.gb82422642f-goog
^ permalink raw reply related [flat|nested] 3+ messages in thread
* [PATCH v5 2/3] media: uvcvideo: Refactor streamon/streamoff
2022-02-04 17:10 [PATCH v5 1/3] media: uvcvideo: Only create input devs if hw supports it Ricardo Ribalda
@ 2022-02-04 17:10 ` Ricardo Ribalda
2022-02-04 17:10 ` [PATCH v5 3/3] media: uvcvideo: Do power management granularly Ricardo Ribalda
1 sibling, 0 replies; 3+ messages in thread
From: Ricardo Ribalda @ 2022-02-04 17:10 UTC (permalink / raw)
To: Laurent Pinchart, Mauro Carvalho Chehab, linux-media,
linux-kernel, Tomasz Figa, Sergey Senozhatsky
Cc: Ricardo Ribalda
Add a new variable to handle the streaming state and handle the
streamoff errors, that were not handled before.
Suggested-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Ricardo Ribalda <ribalda@chromium.org>
---
drivers/media/usb/uvc/uvc_v4l2.c | 19 ++++++++++++++++---
drivers/media/usb/uvc/uvcvideo.h | 1 +
2 files changed, 17 insertions(+), 3 deletions(-)
diff --git a/drivers/media/usb/uvc/uvc_v4l2.c b/drivers/media/usb/uvc/uvc_v4l2.c
index 711556d13d03..ae1f221b2a5d 100644
--- a/drivers/media/usb/uvc/uvc_v4l2.c
+++ b/drivers/media/usb/uvc/uvc_v4l2.c
@@ -836,13 +836,19 @@ static int uvc_ioctl_streamon(struct file *file, void *fh,
{
struct uvc_fh *handle = fh;
struct uvc_streaming *stream = handle->stream;
- int ret;
+ int ret = -EBUSY;
if (!uvc_has_privileges(handle))
return -EBUSY;
mutex_lock(&stream->mutex);
+
+ if (handle->is_streaming)
+ goto unlock;
ret = uvc_queue_streamon(&stream->queue, type);
+ handle->is_streaming = !ret;
+
+unlock:
mutex_unlock(&stream->mutex);
return ret;
@@ -853,15 +859,22 @@ static int uvc_ioctl_streamoff(struct file *file, void *fh,
{
struct uvc_fh *handle = fh;
struct uvc_streaming *stream = handle->stream;
+ int ret = 0;
if (!uvc_has_privileges(handle))
return -EBUSY;
mutex_lock(&stream->mutex);
- uvc_queue_streamoff(&stream->queue, type);
+
+ if (!handle->is_streaming)
+ goto unlock;
+ ret = uvc_queue_streamoff(&stream->queue, type);
+ handle->is_streaming = !!ret;
+
+unlock:
mutex_unlock(&stream->mutex);
- return 0;
+ return ret;
}
static int uvc_ioctl_enum_input(struct file *file, void *fh,
diff --git a/drivers/media/usb/uvc/uvcvideo.h b/drivers/media/usb/uvc/uvcvideo.h
index 143230b3275b..5958b2a54dab 100644
--- a/drivers/media/usb/uvc/uvcvideo.h
+++ b/drivers/media/usb/uvc/uvcvideo.h
@@ -720,6 +720,7 @@ enum uvc_handle_state {
struct uvc_fh {
struct v4l2_fh vfh;
+ bool is_streaming;
struct uvc_video_chain *chain;
struct uvc_streaming *stream;
enum uvc_handle_state state;
--
2.35.0.263.gb82422642f-goog
^ permalink raw reply related [flat|nested] 3+ messages in thread
* [PATCH v5 3/3] media: uvcvideo: Do power management granularly
2022-02-04 17:10 [PATCH v5 1/3] media: uvcvideo: Only create input devs if hw supports it Ricardo Ribalda
2022-02-04 17:10 ` [PATCH v5 2/3] media: uvcvideo: Refactor streamon/streamoff Ricardo Ribalda
@ 2022-02-04 17:10 ` Ricardo Ribalda
1 sibling, 0 replies; 3+ messages in thread
From: Ricardo Ribalda @ 2022-02-04 17:10 UTC (permalink / raw)
To: Laurent Pinchart, Mauro Carvalho Chehab, linux-media,
linux-kernel, Tomasz Figa, Sergey Senozhatsky
Cc: Ricardo Ribalda
Instead of suspending/resume the USB device at open()/close(), do it
when the device is actually used.
This way we can reduce the power consumption when a service is holding
the video device and leaving it in an idle state.
Reviewed-by: Tomasz Figa <tfiga@chromium.org>
Signed-off-by: Ricardo Ribalda <ribalda@chromium.org>
---
drivers/media/usb/uvc/uvc_v4l2.c | 174 +++++++++++++++++++++++++------
1 file changed, 142 insertions(+), 32 deletions(-)
diff --git a/drivers/media/usb/uvc/uvc_v4l2.c b/drivers/media/usb/uvc/uvc_v4l2.c
index ae1f221b2a5d..6bea62a0b206 100644
--- a/drivers/media/usb/uvc/uvc_v4l2.c
+++ b/drivers/media/usb/uvc/uvc_v4l2.c
@@ -25,6 +25,46 @@
#include "uvcvideo.h"
+/* ------------------------------------------------------------------------
+ * UVC power management
+ */
+
+static int uvc_pm_get(struct uvc_streaming *stream)
+{
+ int ret = 0;
+
+ ret = usb_autopm_get_interface(stream->dev->intf);
+ if (ret)
+ return ret;
+
+ mutex_lock(&stream->dev->lock);
+ if (!stream->dev->users)
+ ret = uvc_status_start(stream->dev, GFP_KERNEL);
+ if (!ret)
+ stream->dev->users++;
+ mutex_unlock(&stream->dev->lock);
+
+ if (ret)
+ usb_autopm_put_interface(stream->dev->intf);
+
+ return ret;
+}
+
+static void uvc_pm_put(struct uvc_streaming *stream)
+{
+ mutex_lock(&stream->dev->lock);
+ if (WARN_ON(!stream->dev->users)) {
+ mutex_unlock(&stream->dev->lock);
+ return;
+ }
+ stream->dev->users--;
+ if (!stream->dev->users)
+ uvc_status_stop(stream->dev);
+ mutex_unlock(&stream->dev->lock);
+
+ usb_autopm_put_interface(stream->dev->intf);
+}
+
/* ------------------------------------------------------------------------
* UVC ioctls
*/
@@ -245,6 +285,9 @@ static int uvc_v4l2_try_format(struct uvc_streaming *stream,
* developers test their webcams with the Linux driver as well as with
* the Windows driver).
*/
+ ret = uvc_pm_get(stream);
+ if (ret)
+ goto done;
mutex_lock(&stream->mutex);
if (stream->dev->quirks & UVC_QUIRK_PROBE_EXTRAFIELDS)
probe->dwMaxVideoFrameSize =
@@ -253,6 +296,7 @@ static int uvc_v4l2_try_format(struct uvc_streaming *stream,
/* Probe the device. */
ret = uvc_probe_video(stream, probe);
mutex_unlock(&stream->mutex);
+ uvc_pm_put(stream);
if (ret < 0)
goto done;
@@ -464,7 +508,13 @@ static int uvc_v4l2_set_streamparm(struct uvc_streaming *stream,
}
/* Probe the device with the new settings. */
+ ret = uvc_pm_get(stream);
+ if (ret) {
+ mutex_unlock(&stream->mutex);
+ return ret;
+ }
ret = uvc_probe_video(stream, &probe);
+ uvc_pm_put(stream);
if (ret < 0) {
mutex_unlock(&stream->mutex);
return ret;
@@ -555,36 +605,29 @@ static int uvc_v4l2_open(struct file *file)
{
struct uvc_streaming *stream;
struct uvc_fh *handle;
- int ret = 0;
stream = video_drvdata(file);
uvc_dbg(stream->dev, CALLS, "%s\n", __func__);
- ret = usb_autopm_get_interface(stream->dev->intf);
- if (ret < 0)
- return ret;
-
/* Create the device handle. */
handle = kzalloc(sizeof(*handle), GFP_KERNEL);
- if (handle == NULL) {
- usb_autopm_put_interface(stream->dev->intf);
+ if (!handle)
return -ENOMEM;
- }
- mutex_lock(&stream->dev->lock);
- if (stream->dev->users == 0) {
- ret = uvc_status_start(stream->dev, GFP_KERNEL);
- if (ret < 0) {
- mutex_unlock(&stream->dev->lock);
- usb_autopm_put_interface(stream->dev->intf);
+ /*
+ * If the uvc evdev exists we cannot suspend when the device
+ * is idle. Otherwise we will miss button actions.
+ */
+ if (stream->dev->input) {
+ int ret;
+
+ ret = uvc_pm_get(stream);
+ if (ret) {
kfree(handle);
return ret;
}
}
- stream->dev->users++;
- mutex_unlock(&stream->dev->lock);
-
v4l2_fh_init(&handle->vfh, &stream->vdev);
v4l2_fh_add(&handle->vfh);
handle->chain = stream->chain;
@@ -606,6 +649,12 @@ static int uvc_v4l2_release(struct file *file)
if (uvc_has_privileges(handle))
uvc_queue_release(&stream->queue);
+ if (handle->is_streaming)
+ uvc_pm_put(stream);
+
+ if (stream->dev->input)
+ uvc_pm_put(stream);
+
/* Release the file handle. */
uvc_dismiss_privileges(handle);
v4l2_fh_del(&handle->vfh);
@@ -613,12 +662,6 @@ static int uvc_v4l2_release(struct file *file)
kfree(handle);
file->private_data = NULL;
- mutex_lock(&stream->dev->lock);
- if (--stream->dev->users == 0)
- uvc_status_stop(stream->dev);
- mutex_unlock(&stream->dev->lock);
-
- usb_autopm_put_interface(stream->dev->intf);
return 0;
}
@@ -845,9 +888,17 @@ static int uvc_ioctl_streamon(struct file *file, void *fh,
if (handle->is_streaming)
goto unlock;
+
+ ret = uvc_pm_get(stream);
+ if (ret)
+ goto unlock;
+
ret = uvc_queue_streamon(&stream->queue, type);
handle->is_streaming = !ret;
+ if (!handle->is_streaming)
+ uvc_pm_put(stream);
+
unlock:
mutex_unlock(&stream->mutex);
@@ -871,6 +922,9 @@ static int uvc_ioctl_streamoff(struct file *file, void *fh,
ret = uvc_queue_streamoff(&stream->queue, type);
handle->is_streaming = !!ret;
+ if (!handle->is_streaming)
+ uvc_pm_put(stream);
+
unlock:
mutex_unlock(&stream->mutex);
@@ -922,6 +976,7 @@ static int uvc_ioctl_g_input(struct file *file, void *fh, unsigned int *input)
{
struct uvc_fh *handle = fh;
struct uvc_video_chain *chain = handle->chain;
+ struct uvc_streaming *stream = handle->stream;
u8 *buf;
int ret;
@@ -935,9 +990,16 @@ static int uvc_ioctl_g_input(struct file *file, void *fh, unsigned int *input)
if (!buf)
return -ENOMEM;
+ ret = uvc_pm_get(stream);
+ if (ret) {
+ kfree(buf);
+ return ret;
+ }
+
ret = uvc_query_ctrl(chain->dev, UVC_GET_CUR, chain->selector->id,
chain->dev->intfnum, UVC_SU_INPUT_SELECT_CONTROL,
buf, 1);
+ uvc_pm_put(stream);
if (!ret)
*input = *buf - 1;
@@ -950,6 +1012,7 @@ static int uvc_ioctl_s_input(struct file *file, void *fh, unsigned int input)
{
struct uvc_fh *handle = fh;
struct uvc_video_chain *chain = handle->chain;
+ struct uvc_streaming *stream = handle->stream;
u8 *buf;
int ret;
@@ -971,10 +1034,17 @@ static int uvc_ioctl_s_input(struct file *file, void *fh, unsigned int input)
if (!buf)
return -ENOMEM;
+ ret = uvc_pm_get(stream);
+ if (ret) {
+ kfree(buf);
+ return ret;
+ }
+
*buf = input + 1;
ret = uvc_query_ctrl(chain->dev, UVC_SET_CUR, chain->selector->id,
chain->dev->intfnum, UVC_SU_INPUT_SELECT_CONTROL,
buf, 1);
+ uvc_pm_put(stream);
kfree(buf);
return ret;
@@ -985,8 +1055,15 @@ static int uvc_ioctl_queryctrl(struct file *file, void *fh,
{
struct uvc_fh *handle = fh;
struct uvc_video_chain *chain = handle->chain;
+ struct uvc_streaming *stream = handle->stream;
+ int ret;
- return uvc_query_v4l2_ctrl(chain, qc);
+ ret = uvc_pm_get(stream);
+ if (ret)
+ return ret;
+ ret = uvc_query_v4l2_ctrl(chain, qc);
+ uvc_pm_put(stream);
+ return ret;
}
static int uvc_ioctl_query_ext_ctrl(struct file *file, void *fh,
@@ -994,10 +1071,15 @@ static int uvc_ioctl_query_ext_ctrl(struct file *file, void *fh,
{
struct uvc_fh *handle = fh;
struct uvc_video_chain *chain = handle->chain;
+ struct uvc_streaming *stream = handle->stream;
struct v4l2_queryctrl qc = { qec->id };
int ret;
+ ret = uvc_pm_get(stream);
+ if (ret)
+ return ret;
ret = uvc_query_v4l2_ctrl(chain, &qc);
+ uvc_pm_put(stream);
if (ret)
return ret;
@@ -1043,6 +1125,7 @@ static int uvc_ioctl_g_ext_ctrls(struct file *file, void *fh,
{
struct uvc_fh *handle = fh;
struct uvc_video_chain *chain = handle->chain;
+ struct uvc_streaming *stream = handle->stream;
struct v4l2_ext_control *ctrl = ctrls->controls;
unsigned int i;
int ret;
@@ -1067,22 +1150,30 @@ static int uvc_ioctl_g_ext_ctrls(struct file *file, void *fh,
return 0;
}
+ ret = uvc_pm_get(stream);
+ if (ret)
+ return ret;
ret = uvc_ctrl_begin(chain);
- if (ret < 0)
+ if (ret < 0) {
+ uvc_pm_put(stream);
return ret;
+ }
for (i = 0; i < ctrls->count; ++ctrl, ++i) {
ret = uvc_ctrl_get(chain, ctrl);
if (ret < 0) {
uvc_ctrl_rollback(handle);
ctrls->error_idx = i;
- return ret;
+ goto done;
}
}
ctrls->error_idx = 0;
- return uvc_ctrl_rollback(handle);
+ ret = uvc_ctrl_rollback(handle);
+done:
+ uvc_pm_put(stream);
+ return ret;
}
static int uvc_ioctl_s_try_ext_ctrls(struct uvc_fh *handle,
@@ -1091,6 +1182,7 @@ static int uvc_ioctl_s_try_ext_ctrls(struct uvc_fh *handle,
{
struct v4l2_ext_control *ctrl = ctrls->controls;
struct uvc_video_chain *chain = handle->chain;
+ struct uvc_streaming *stream = handle->stream;
unsigned int i;
int ret;
@@ -1098,9 +1190,15 @@ static int uvc_ioctl_s_try_ext_ctrls(struct uvc_fh *handle,
if (ret < 0)
return ret;
+ ret = uvc_pm_get(stream);
+ if (ret)
+ return ret;
+
ret = uvc_ctrl_begin(chain);
- if (ret < 0)
+ if (ret < 0) {
+ uvc_pm_put(stream);
return ret;
+ }
for (i = 0; i < ctrls->count; ++ctrl, ++i) {
ret = uvc_ctrl_set(handle, ctrl);
@@ -1108,16 +1206,20 @@ static int uvc_ioctl_s_try_ext_ctrls(struct uvc_fh *handle,
uvc_ctrl_rollback(handle);
ctrls->error_idx = ioctl == VIDIOC_S_EXT_CTRLS ?
ctrls->count : i;
- return ret;
+ goto done;
}
}
ctrls->error_idx = 0;
if (ioctl == VIDIOC_S_EXT_CTRLS)
- return uvc_ctrl_commit(handle, ctrls);
+ ret = uvc_ctrl_commit(handle, ctrls);
else
- return uvc_ctrl_rollback(handle);
+ ret = uvc_ctrl_rollback(handle);
+
+done:
+ uvc_pm_put(stream);
+ return ret;
}
static int uvc_ioctl_s_ext_ctrls(struct file *file, void *fh,
@@ -1141,8 +1243,16 @@ static int uvc_ioctl_querymenu(struct file *file, void *fh,
{
struct uvc_fh *handle = fh;
struct uvc_video_chain *chain = handle->chain;
+ struct uvc_streaming *stream = handle->stream;
+ int ret;
+
+ ret = uvc_pm_get(stream);
+ if (ret)
+ return ret;
+ ret = uvc_query_v4l2_menu(chain, qm);
+ uvc_pm_put(stream);
- return uvc_query_v4l2_menu(chain, qm);
+ return ret;
}
static int uvc_ioctl_g_selection(struct file *file, void *fh,
--
2.35.0.263.gb82422642f-goog
^ permalink raw reply related [flat|nested] 3+ messages in thread
end of thread, other threads:[~2022-02-04 17:10 UTC | newest]
Thread overview: 3+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2022-02-04 17:10 [PATCH v5 1/3] media: uvcvideo: Only create input devs if hw supports it Ricardo Ribalda
2022-02-04 17:10 ` [PATCH v5 2/3] media: uvcvideo: Refactor streamon/streamoff Ricardo Ribalda
2022-02-04 17:10 ` [PATCH v5 3/3] media: uvcvideo: Do power management granularly Ricardo Ribalda
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