/dev/usb/usb
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This device is internally used by several USB resource managers. Not much information is known at this time.
It is implemented by a module (USB) in IOS58 that runs under UID 17 (PID_USB). This resource manager can only be opened from that UID. It appears to be able to generically address devices via /dev/usb/oh0 and /dev/usb/ehc. It is accessed via several ioctls.
Because all of the USB related modules run under the same UID, they all share the same file descriptor table. This allows ioctl 1 (GetDeviceList) to return FDs to /dev/usb/ehc and /dev/usb/oh0. These are directly used by VEN, HID, etc. when submitting transfers, without going through /dev/usb/usb.
Ioctls
| Ioctl | Parameters (inbuf_len / iobuf_len) | Function | Notes |
|---|---|---|---|
| 0 | 0 / 4 | GetVersion | puts "0x10001" into the io_buf |
| 1 | 0 / > =0x300 | GetDeviceChange | |
| 2 | 8 / >= 8 | GetDeviceInfo | |
| 4 | 8 / 0 | SuspendResume | calls ? ioctl 4 and/or 6?. inbuf: u32 at offset 0, u8 at offset 4 |