[PATCH v5 0/5] media: uvcvideo: Implement the Privacy GPIO as a evdev

[Ricardo Ribalda <ribalda@chromium.org>]

Some notebooks have a button to disable the camera (not to be mistaken
with the mechanical cover). This is a standard GPIO linked to the
camera via the ACPI table.

4 years ago we added support for this button in UVC via the Privacy control.
This has three issues:
- If the camera has its own privacy control, it will be masked.
- We need to power-up the camera to read the privacy control gpio.
- Other drivers have not followed this approach and have used evdev.

We fixed the power-up isses with "granular power saving", but the other
issues are still open.

This patchset implements the Privacy GPIO as a evdev.

Signed-off-by: Ricardo Ribalda <ribalda@chromium.org>
---
Changes in v5:
- Drop UVC_GUID_EXT_GPIO_CONTROLLER
- Remove merged patches and patches that will conflict with uvc-rotation
- Rebase
- Link to v4: https://lore.kernel.org/r/20241125-uvc-subdev-v4-0-51e040599f1a@chromium.org

Changes in v4:
- Remove gpio entity, it is not needed.
- Use unit->gpio.irq in free_irq to make smatch happy.
- Link to v3: https://lore.kernel.org/r/20241112-uvc-subdev-v3-0-0ea573d41a18@chromium.org

Changes in v3:
- CodeStyle (Thanks Sakari)
- Re-implement as input device
- Make the code depend on UVC_INPUT_EVDEV
- Link to v2: https://lore.kernel.org/r/20241108-uvc-subdev-v2-0-85d8a051a3d3@chromium.org

Changes in v2:
- Rebase on top of https://patchwork.linuxtv.org/project/linux-media/patch/20241106-uvc-crashrmmod-v6-1-fbf9781c6e83@chromium.org/
- Create uvc_gpio_cleanup and uvc_gpio_deinit
- Refactor quirk: do not disable irq
- Change define number for MEDIA_ENT_F_GPIO
- Link to v1: https://lore.kernel.org/r/20241031-uvc-subdev-v1-0-a68331cedd72@chromium.org

---
Ricardo Ribalda (5):
      media: uvcvideo: Factor out gpio functions to its own file
      media: uvcvideo: Re-implement privacy GPIO as an input device
      media: uvcvideo: Introduce UVC_QUIRK_PRIVACY_DURING_STREAM
      media: uvcvideo: Make gpio_unit entity-less
      media: uvcvideo: Remove UVC_EXT_GPIO entity

 drivers/media/usb/uvc/Kconfig      |   2 +-
 drivers/media/usb/uvc/Makefile     |   3 +
 drivers/media/usb/uvc/uvc_ctrl.c   |  20 ------
 drivers/media/usb/uvc/uvc_driver.c | 135 ++---------------------------------
 drivers/media/usb/uvc/uvc_entity.c |   1 -
 drivers/media/usb/uvc/uvc_gpio.c   | 139 +++++++++++++++++++++++++++++++++++++
 drivers/media/usb/uvc/uvc_status.c |  13 +++-
 drivers/media/usb/uvc/uvc_video.c  |   4 ++
 drivers/media/usb/uvc/uvcvideo.h   |  38 ++++++----
 include/linux/usb/uvc.h            |   3 -
 10 files changed, 185 insertions(+), 173 deletions(-)
---
base-commit: d968e50b5c26642754492dea23cbd3592bde62d8
change-id: 20241030-uvc-subdev-89f4467a00b5

Best regards,
-- 
Ricardo Ribalda <ribalda@chromium.org>