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unix: add HIDRAW ioctls

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This change adds (most) of the ioctl API for the Linux HIDRAW interface.
Reading and writing non-numbered HID reports is done using the read and
write system calls respectively.

Some of the HIDIOC* request numbers are exported directly while others
are kept unexported. This is because some of the #defines require a len
attribute that doesn't have a specific well defined value.

Wrapper types are added for most of the request numbers as is standard.
No wrapper is added for HIDIOCGRDESCSIZE as it would just be
IoctlGetUint32.

The HIDIOC[GS]FEATURE, HIDIOC[GS]INPUT and HIDIOC[GS]OUTPUT request
numbers, which are required for numbered HID reports, are entirely
ommitted as the len attribute has to be a runtime variable. These could
be added later by doing something like
 `HIDIOCGFEATURE(0) | (len << _IOC_SIZESHIFT)`,
with care taken that len doesn't overflow _IOC_XSIZEMASK.

Outdated documentation for the HIDRAW interface is available at:
https://www.kernel.org/doc/Documentation/hid/hidraw.txt.

Change-Id: I2ae5060f0f46150f6fb52959c2e55f50927c1f69
Reviewed-on: https://go-review.googlesource.com/c/sys/+/289169
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Tobias Klauser <tobias.klauser@gmail.com>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
This commit is contained in:
Tom Thorogood
2021-02-23 08:53:22 +00:00
committed by Tobias Klauser
parent d8cc79f4ae
commit b80eb88b80
18 changed files with 153 additions and 1 deletions
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unix/syscall_linux.go
+30
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@@ -153,6 +153,36 @@ func IoctlWatchdogKeepalive(fd int) error {
return ioctl(fd, WDIOC_KEEPALIVE, 0)
}
func IoctlHIDGetDesc(fd int, value *HIDRawReportDescriptor) error {
err := ioctl(fd, HIDIOCGRDESC, uintptr(unsafe.Pointer(value)))
runtime.KeepAlive(value)
return err
}
func IoctlHIDGetRawInfo(fd int) (*HIDRawDevInfo, error) {
var value HIDRawDevInfo
err := ioctl(fd, HIDIOCGRAWINFO, uintptr(unsafe.Pointer(&value)))
return &value, err
}
func IoctlHIDGetRawName(fd int) (string, error) {
var value [_HIDIOCGRAWNAME_LEN]byte
err := ioctl(fd, _HIDIOCGRAWNAME, uintptr(unsafe.Pointer(&value[0])))
return ByteSliceToString(value[:]), err
}
func IoctlHIDGetRawPhys(fd int) (string, error) {
var value [_HIDIOCGRAWPHYS_LEN]byte
err := ioctl(fd, _HIDIOCGRAWPHYS, uintptr(unsafe.Pointer(&value[0])))
return ByteSliceToString(value[:]), err
}
func IoctlHIDGetRawUniq(fd int) (string, error) {
var value [_HIDIOCGRAWUNIQ_LEN]byte
err := ioctl(fd, _HIDIOCGRAWUNIQ, uintptr(unsafe.Pointer(&value[0])))
return ByteSliceToString(value[:]), err
}
//sys Linkat(olddirfd int, oldpath string, newdirfd int, newpath string, flags int) (err error)
func Link(oldpath string, newpath string) (err error) {