Bug 199885
| Summary: | Bluetooth HID devices do not report idVendor/idProduct values to sysfs (while USB HID devices do) | ||
|---|---|---|---|
| Product: | Drivers | Reporter: | Hanno Zulla (abos) |
| Component: | Bluetooth | Assignee: | linux-bluetooth (linux-bluetooth) |
| Status: | RESOLVED INVALID | ||
| Severity: | low | ||
| Priority: | P1 | ||
| Hardware: | All | ||
| OS: | Linux | ||
| Kernel Version: | 4.15.0 | Subsystem: | |
| Regression: | No | Bisected commit-id: | |
Found out about the "id/" subdirectory in input driver's sysfs entry. |
Hello, this is in reference to [1]. udev rules are based on the content of sysfs. The PS3 gamepad will connect with a Linux computer either via USB [2] or via Bluetooth [3] - the kernel driver hid-sony.c for this device uses the same HID idVendor/idProduct combination to identify it. I would thus expect a udev rule with ATTRS{idVendor}=="054c", ATTRS{idProduct}=="0268" to match this device when connected with USB or Bluetooth. But this only works for USB connections, since the USB stack exposes these values to sysfs, while Bluetooth does not. Meanwhile the Bluetooth only reports back the full device "name" ("%s %s", manufacturer, product). This is unfortunate, as that name is not specific enough. There are devices out there using the same generic name but different idVendor/idProduct combinations. It would be very beneficial if Bluetooth HID devices could export the same values to sysfs as USB HID devices already do, e.g. at least - manufacturer - product - idVendor - idProduct - version To review the problem, here are the outputs of udevadm info -a -n /dev/input/js0 for the same PS3 gamepad - connected via USB [4] - connected via Bluetooth [5] Thanks! [1] https://github.com/systemd/systemd/issues/9101 [2] https://github.com/torvalds/linux/blob/7fbb6157630f2ba6ee355689061f9596b84373ef/drivers/hid/hid-sony.c#L3038 [3] https://github.com/torvalds/linux/blob/7fbb6157630f2ba6ee355689061f9596b84373ef/drivers/hid/hid-sony.c#L3048 [4] https://github.com/systemd/systemd/files/2044163/udev-sony-usb.txt [5] https://github.com/systemd/systemd/files/2044164/udev-sony-bluetooth.txt