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Check several /dev/video nodes in order to find the platform #578

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merged 1 commit into from
Oct 6, 2023
Merged

Check several /dev/video nodes in order to find the platform #578

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37 changes: 21 additions & 16 deletions core/libcamera_app.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -36,25 +36,30 @@ enum class Platform

Platform get_platform()
{
int fd = open("/dev/video0", O_RDWR, 0);
if (fd < 0)
return Platform::MISSING;
for (unsigned int device_num = 0; device_num < 5; device_num++)
{
char device_name[16];
snprintf(device_name, sizeof(device_name), "/dev/video%u", device_num);
int fd = open(device_name, O_RDWR, 0);
if (fd < 0)
return Platform::UNKNOWN;

v4l2_capability caps;
unsigned long request = VIDIOC_QUERYCAP;
v4l2_capability caps;
unsigned long request = VIDIOC_QUERYCAP;

int ret = ioctl(fd, request, &caps);
close(fd);
int ret = ioctl(fd, request, &caps);
close(fd);

if (ret)
return Platform::UNKNOWN;

if (!strncmp((char *)caps.card, "unicam", sizeof(caps.card)))
return Platform::VC4;
else if (!strncmp((char *)caps.card, "rp1-cfe", sizeof(caps.card)))
return Platform::PISP;
else if (!strncmp((char *)caps.card, "bm2835 mmal", sizeof(caps.card)))
return Platform::LEGACY;
if (ret)
return Platform::UNKNOWN;

if (!strncmp((char *)caps.card, "unicam", sizeof(caps.card)))
return Platform::VC4;
else if (!strncmp((char *)caps.card, "rp1-cfe", sizeof(caps.card)))
return Platform::PISP;
else if (!strncmp((char *)caps.card, "bm2835 mmal", sizeof(caps.card)))
return Platform::LEGACY;
}

return Platform::UNKNOWN;
}
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