[v4,0/9] Show privacy_gpio as a v4l2_ctrl

Message

Ricardo Ribalda Dec. 15, 2020, 3:44 p.m. UTC

Some devices can implement a physical switch to disable the input of the
camera on demand. Think of it like an elegant privacy sticker.

The system can read the status of the privacy switch via a GPIO.

The ACPI table maps this GPIO to the USB device via _CRS and _DSD
descriptors, so the kernel can find it.

The userspace applications need to know if the privacy pin is enabled
or not.

The obvious way to show it to userspace is via the V4L2_CID_PRIVACY control.

This patchset implement this functionality.

v4: Implement UVC_QUIRK_PRIVACY_DURING_STREAM

v3: Thanks to all the comments from Joe Perches
- Rework of printk macros

v2: Thanks to all the comments from Laurent!

- move guid to unit
- support entities with no pads
- CodeStyle
- Irq handling
- pr_cont
- new ids

Ricardo Ribalda (9):
  media: uvcvideo: Move guid to entity
  media: uvcvideo: Allow external entities
  media: uvcvideo: Allow entities with no pads
  media: uvcvideo: Entity defined get_info and get_cur
  media: uvcvideo: Implement UVC_EXT_GPIO_UNIT
  media: uvcvideo: Add Privacy control based on EXT_GPIO
  media: uvcvideo: Use dev_ printk aliases
  media: uvcvideo: New macro uvc_trace_cont
  media: uvcvideo: Implement UVC_QUIRK_PRIVACY_DURING_STREAM

 drivers/media/usb/uvc/uvc_ctrl.c   |  80 ++++---
 drivers/media/usb/uvc/uvc_driver.c | 322 +++++++++++++++++++++++------
 drivers/media/usb/uvc/uvc_entity.c |  10 +-
 drivers/media/usb/uvc/uvc_queue.c  |   3 +
 drivers/media/usb/uvc/uvc_status.c |  13 +-
 drivers/media/usb/uvc/uvc_video.c  |  51 ++---
 drivers/media/usb/uvc/uvcvideo.h   |  54 +++--
 7 files changed, 389 insertions(+), 144 deletions(-)