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| author | Sakari Ailus <sakari.ailus@linux.intel.com> | 2020-10-13 17:54:00 +0300 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab+huawei@kernel.org> | 2020-11-16 12:31:15 +0300 |
| commit | 1b888b3cebef2de3936167e95652830145040b78 (patch) | |
| tree | bfa5899ca4a319b960f44d40aebf3756c36fb514 /drivers/media/v4l2-core/v4l2-common.c | |
| parent | 9d0a79e55a626165efb52bb15d714d231fc985e6 (diff) | |
| download | linux-1b888b3cebef2de3936167e95652830145040b78.tar.xz | |
media: v4l: Add a helper for obtaining the link frequency
Add a helper for obtaining the link frequency from transmitter drivers.
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Diffstat (limited to 'drivers/media/v4l2-core/v4l2-common.c')
| -rw-r--r-- | drivers/media/v4l2-core/v4l2-common.c | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/drivers/media/v4l2-core/v4l2-common.c b/drivers/media/v4l2-core/v4l2-common.c index 3dc17ebe14fa..78007dba4677 100644 --- a/drivers/media/v4l2-core/v4l2-common.c +++ b/drivers/media/v4l2-core/v4l2-common.c @@ -441,3 +441,36 @@ int v4l2_fill_pixfmt(struct v4l2_pix_format *pixfmt, u32 pixelformat, return 0; } EXPORT_SYMBOL_GPL(v4l2_fill_pixfmt); + +s64 v4l2_get_link_rate(struct v4l2_ctrl_handler *handler, unsigned int mul, + unsigned int div) +{ + struct v4l2_ctrl *ctrl; + s64 freq; + + ctrl = v4l2_ctrl_find(handler, V4L2_CID_LINK_FREQ); + if (ctrl) { + struct v4l2_querymenu qm = { .id = V4L2_CID_LINK_FREQ }; + int ret; + + qm.index = v4l2_ctrl_g_ctrl(ctrl); + + ret = v4l2_querymenu(handler, &qm); + if (ret) + return -ENOENT; + + freq = qm.value; + } else { + if (!mul || !div) + return -ENOENT; + + ctrl = v4l2_ctrl_find(handler, V4L2_CID_PIXEL_RATE); + if (!ctrl) + return -ENOENT; + + freq = div_u64(v4l2_ctrl_g_ctrl_int64(ctrl) * mul, div); + } + + return freq > 0 ? freq : -EINVAL; +} +EXPORT_SYMBOL_GPL(v4l2_get_link_rate); |