git.openwrt.org Git - openwrt/staging/blocktrron.git/blob

   1 From 4380b6913ec718c6b0503015e027098da0bccb6e Mon Sep 17 00:00:00 2001
   2 From: =?UTF-8?q?Jakub=20Van=C4=9Bk?= <linuxtardis@gmail.com>
   3 Date: Wed, 7 Jul 2021 22:48:20 +0200
   4 Subject: [PATCH] media: bcm2835-unicam: Forward input status from
   5  subdevice
   6 MIME-Version: 1.0
   7 Content-Type: text/plain; charset=UTF-8
   8 Content-Transfer-Encoding: 8bit
   9
  10 The vidioc_enum_input() v4l2 ioctl is capable of returning
  11 sensor/input status as well. This is used in current
  12 GStreamer HEAD for signal detection [1].
  13
  14 bcm2835-unicam does handle this syscall, but it didn't ask
  15 the subdevice driver about the input status. The input then
  16 appeared as always present.
  17
  18 This commit adds the necessary query. There is a precedent for
  19 this - the R-Car VIN V4L2 driver does a similar call [2].
  20
  21 [1]: https://gitlab.freedesktop.org/gstreamer/gst-plugins-good/-/blob/ce0be27caf69aa9d96b73bc2b50737451b6f6936/sys/v4l2/gstv4l2src.c#L553
  22 [2]: https://github.com/raspberrypi/linux/blob/7fb9d006d3ff3baf2e205e0c85c4e4fd0a64fcd0/drivers/media/platform/rcar-vin/rcar-v4l2.c#L548
  23
  24 Signed-off-by: Jakub Vaněk <linuxtardis@gmail.com>
  25 ---
  26  drivers/media/platform/bcm2835/bcm2835-unicam.c | 9 +++++++++
  27  1 file changed, 9 insertions(+)
  28
  29 --- a/drivers/media/platform/bcm2835/bcm2835-unicam.c
  30 +++ b/drivers/media/platform/bcm2835/bcm2835-unicam.c
  31 @@ -1810,6 +1810,7 @@ static int unicam_enum_input(struct file
  32  {
  33         struct unicam_node *node = video_drvdata(file);
  34         struct unicam_device *dev = node->dev;
  35 +       int ret;
  36
  37         if (inp->index != 0)
  38                 return -EINVAL;
  39 @@ -1826,6 +1827,14 @@ static int unicam_enum_input(struct file
  40                 inp->capabilities = 0;
  41                 inp->std = 0;
  42         }
  43 +
  44 +       if (v4l2_subdev_has_op(dev->sensor, video, g_input_status)) {
  45 +               ret = v4l2_subdev_call(dev->sensor, video, g_input_status,
  46 +                                      &inp->status);
  47 +               if (ret < 0)
  48 +                       return ret;
  49 +       }
  50 +
  51         snprintf(inp->name, sizeof(inp->name), "Camera 0");
  52         return 0;
  53  }