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/dev/usb/ven is an IOS resource manager that is used to interact with USB devices. This device is implemented only in IOS57, 58 and 59 by the USB_VEN module, which is a thin wrapper around /dev/usb/usb. It replaces /dev/usb/oh0, which is repurposed as an internal USB backend in these versions.
VEN is often used by official games to communicate with USB cameras (such as Your Shape) and microphones (in the newer singing games). It is also used by libogc for USB2 support.
All buffers must be in MEM2 (addr > 0x10000000) and aligned to a 32-byte boundary. For all of the ioctlvs, the first buffer must be 64 bytes long.
Only IOS_OPEN, IOS_CLOSE, IOS_IOCTL and IOS_IOCTLV are valid commands. The other commands immediately return IPC_EINVAL (-4).
Up to 16 handles can be opened, each with their own device change hook. The handle ID is specified in the open request as the "mode". IPC_EINVAL will be returned if an ID that is in use is passed.
|0||0 / 0x20 (ioctl)||ven_open|
|1||0 / 0x180 (ioctl)||ven_attach_complete_callback|
|2||0 / 0 (ioctl)||ven_close|
|3||0x20 / 0xC0 (ioctl)||?||calls /dev/usb/usb ioctl 2|
|4||0x20 / 0 (ioctl)||?|
|5||0x20 / 0 (ioctl)||?||indirectly calls /dev/usb/usb ioctl 1|
|6||0 / 0 (ioctl)||?||calls /dev/usb/usb ioctl 1|
|7||0x20 / 0 (ioctl)||ven_set_alt_setting||calls /dev/usb/usb ioctl 5 and/or 0x11|
|8||0x20 / ? (ioctl)||?||calls /dev/usb/usb ioctl 3|
|0x10||0x20 / 0 (ioctl)||ven_suspend_resume, ven_attach_suspend_callback, ven_attach_get_device_params_callback||calls /dev/usb/usb ioctl 4|
|0x11||0x20 / 0 (ioctl)||ven_cancel_endpoint||calls /dev/usb/usb ioctl 0x10|
|0x12||1 in / 1 io, or 2 in / 0 io? (ioctlv)||ven_ctrl||calls /dev/usb/usb ioctl 0x11|
|0x13||1/1 or 2/0? (ioctlv)||ven_intr||calls /dev/usb/usb ioctl 0x12|
|0x14||2/2 or 3/1 (ioctlv)||ven_isoc||calls /dev/usb/usb ioctl 0x13|
|0x15||? (ioctlv)||ven_?||calls /dev/usb/usb ioctl 0x14|