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implement hid_get_input_report for Linux hidraw backend #351

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merged 1 commit into from
Dec 10, 2021
+14 −5
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implement hid_get_input_report for Linux hidraw backend #351

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19 changes: 14 additions & 5 deletions linux/hid.c
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Original file line number Diff line number Diff line change
Expand Up @@ -62,6 +62,13 @@
#endif


// HIDIOCGINPUT is not defined in Linux kernel headers < 5.11.
// This definition is from hidraw.h in Linux >= 5.11.
// https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=f43d3870cafa2a0f3854c1819c8385733db8f9ae
#ifndef HIDIOCGINPUT
#define HIDIOCGINPUT(len) _IOC(_IOC_WRITE|_IOC_READ, 'H', 0x0A, len)
#endif

/* USB HID device property names */
const char *device_string_names[] = {
"manufacturer",
Expand Down Expand Up @@ -1065,13 +1072,15 @@ int HID_API_EXPORT hid_get_feature_report(hid_device *dev, unsigned char *data,
return res;
}

// Not supported by Linux HidRaw yet
int HID_API_EXPORT HID_API_CALL hid_get_input_report(hid_device *dev, unsigned char *data, size_t length)
{
(void)dev;
(void)data;
(void)length;
return -1;
int res;

res = ioctl(dev->device_handle, HIDIOCGINPUT(length), data);
if (res < 0)
register_device_error_format(dev, "ioctl (GINPUT): %s", strerror(errno));

return res;
}

void HID_API_EXPORT hid_close(hid_device *dev)
Expand Down