| /* |
| * Copyright © 2011-2013 Martin Pieuchot <mpi@openbsd.org> |
| * |
| * This library is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Lesser General Public |
| * License as published by the Free Software Foundation; either |
| * version 2.1 of the License, or (at your option) any later version. |
| * |
| * This library is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Lesser General Public License for more details. |
| * |
| * You should have received a copy of the GNU Lesser General Public |
| * License along with this library; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| */ |
| |
| #include <config.h> |
| |
| #include <sys/time.h> |
| #include <sys/types.h> |
| |
| #include <errno.h> |
| #include <fcntl.h> |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #include <unistd.h> |
| |
| #include <dev/usb/usb.h> |
| |
| #include "libusbi.h" |
| |
| struct device_priv { |
| char *devname; /* name of the ugen(4) node */ |
| int fd; /* device file descriptor */ |
| |
| unsigned char *cdesc; /* active config descriptor */ |
| usb_device_descriptor_t ddesc; /* usb device descriptor */ |
| }; |
| |
| struct handle_priv { |
| int endpoints[USB_MAX_ENDPOINTS]; |
| }; |
| |
| /* |
| * Backend functions |
| */ |
| static int obsd_get_device_list(struct libusb_context *, |
| struct discovered_devs **); |
| static int obsd_open(struct libusb_device_handle *); |
| static void obsd_close(struct libusb_device_handle *); |
| |
| static int obsd_get_device_descriptor(struct libusb_device *, unsigned char *, |
| int *); |
| static int obsd_get_active_config_descriptor(struct libusb_device *, |
| unsigned char *, size_t, int *); |
| static int obsd_get_config_descriptor(struct libusb_device *, uint8_t, |
| unsigned char *, size_t, int *); |
| |
| static int obsd_get_configuration(struct libusb_device_handle *, int *); |
| static int obsd_set_configuration(struct libusb_device_handle *, int); |
| |
| static int obsd_claim_interface(struct libusb_device_handle *, int); |
| static int obsd_release_interface(struct libusb_device_handle *, int); |
| |
| static int obsd_set_interface_altsetting(struct libusb_device_handle *, int, |
| int); |
| static int obsd_clear_halt(struct libusb_device_handle *, unsigned char); |
| static void obsd_destroy_device(struct libusb_device *); |
| |
| static int obsd_submit_transfer(struct usbi_transfer *); |
| static int obsd_cancel_transfer(struct usbi_transfer *); |
| static int obsd_handle_transfer_completion(struct usbi_transfer *); |
| |
| /* |
| * Private functions |
| */ |
| static int _errno_to_libusb(int); |
| static int _cache_active_config_descriptor(struct libusb_device *); |
| static int _sync_control_transfer(struct usbi_transfer *); |
| static int _sync_gen_transfer(struct usbi_transfer *); |
| static int _access_endpoint(struct libusb_transfer *); |
| |
| static int _bus_open(int); |
| |
| |
| const struct usbi_os_backend usbi_backend = { |
| .name = "Synchronous OpenBSD backend", |
| .get_device_list = obsd_get_device_list, |
| .open = obsd_open, |
| .close = obsd_close, |
| |
| .get_device_descriptor = obsd_get_device_descriptor, |
| .get_active_config_descriptor = obsd_get_active_config_descriptor, |
| .get_config_descriptor = obsd_get_config_descriptor, |
| |
| .get_configuration = obsd_get_configuration, |
| .set_configuration = obsd_set_configuration, |
| |
| .claim_interface = obsd_claim_interface, |
| .release_interface = obsd_release_interface, |
| |
| .set_interface_altsetting = obsd_set_interface_altsetting, |
| .clear_halt = obsd_clear_halt, |
| .destroy_device = obsd_destroy_device, |
| |
| .submit_transfer = obsd_submit_transfer, |
| .cancel_transfer = obsd_cancel_transfer, |
| |
| .handle_transfer_completion = obsd_handle_transfer_completion, |
| |
| .device_priv_size = sizeof(struct device_priv), |
| .device_handle_priv_size = sizeof(struct handle_priv), |
| }; |
| |
| #define DEVPATH "/dev/" |
| #define USBDEV DEVPATH "usb" |
| |
| int |
| obsd_get_device_list(struct libusb_context * ctx, |
| struct discovered_devs **discdevs) |
| { |
| struct discovered_devs *ddd; |
| struct libusb_device *dev; |
| struct device_priv *dpriv; |
| struct usb_device_info di; |
| struct usb_device_ddesc dd; |
| unsigned long session_id; |
| char devices[USB_MAX_DEVICES]; |
| char busnode[16]; |
| char *udevname; |
| int fd, addr, i, j; |
| |
| usbi_dbg(" "); |
| |
| for (i = 0; i < 8; i++) { |
| snprintf(busnode, sizeof(busnode), USBDEV "%d", i); |
| |
| if ((fd = open(busnode, O_RDWR)) < 0) { |
| if (errno != ENOENT && errno != ENXIO) |
| usbi_err(ctx, "could not open %s", busnode); |
| continue; |
| } |
| |
| bzero(devices, sizeof(devices)); |
| for (addr = 1; addr < USB_MAX_DEVICES; addr++) { |
| if (devices[addr]) |
| continue; |
| |
| di.udi_addr = addr; |
| if (ioctl(fd, USB_DEVICEINFO, &di) < 0) |
| continue; |
| |
| /* |
| * XXX If ugen(4) is attached to the USB device |
| * it will be used. |
| */ |
| udevname = NULL; |
| for (j = 0; j < USB_MAX_DEVNAMES; j++) |
| if (!strncmp("ugen", di.udi_devnames[j], 4)) { |
| udevname = strdup(di.udi_devnames[j]); |
| break; |
| } |
| |
| session_id = (di.udi_bus << 8 | di.udi_addr); |
| dev = usbi_get_device_by_session_id(ctx, session_id); |
| |
| if (dev == NULL) { |
| dev = usbi_alloc_device(ctx, session_id); |
| if (dev == NULL) { |
| close(fd); |
| return (LIBUSB_ERROR_NO_MEM); |
| } |
| |
| dev->bus_number = di.udi_bus; |
| dev->device_address = di.udi_addr; |
| dev->speed = di.udi_speed; |
| |
| dpriv = usbi_get_device_priv(dev); |
| dpriv->fd = -1; |
| dpriv->cdesc = NULL; |
| dpriv->devname = udevname; |
| |
| dd.udd_bus = di.udi_bus; |
| dd.udd_addr = di.udi_addr; |
| if (ioctl(fd, USB_DEVICE_GET_DDESC, &dd) < 0) { |
| libusb_unref_device(dev); |
| continue; |
| } |
| dpriv->ddesc = dd.udd_desc; |
| |
| if (_cache_active_config_descriptor(dev)) { |
| libusb_unref_device(dev); |
| continue; |
| } |
| |
| if (usbi_sanitize_device(dev)) { |
| libusb_unref_device(dev); |
| continue; |
| } |
| } |
| |
| ddd = discovered_devs_append(*discdevs, dev); |
| if (ddd == NULL) { |
| close(fd); |
| return (LIBUSB_ERROR_NO_MEM); |
| } |
| libusb_unref_device(dev); |
| |
| *discdevs = ddd; |
| devices[addr] = 1; |
| } |
| |
| close(fd); |
| } |
| |
| return (LIBUSB_SUCCESS); |
| } |
| |
| int |
| obsd_open(struct libusb_device_handle *handle) |
| { |
| struct device_priv *dpriv = usbi_get_device_priv(handle->dev); |
| char devnode[16]; |
| |
| if (dpriv->devname) { |
| /* |
| * Only open ugen(4) attached devices read-write, all |
| * read-only operations are done through the bus node. |
| */ |
| snprintf(devnode, sizeof(devnode), DEVPATH "%s.00", |
| dpriv->devname); |
| dpriv->fd = open(devnode, O_RDWR); |
| if (dpriv->fd < 0) |
| return _errno_to_libusb(errno); |
| |
| usbi_dbg("open %s: fd %d", devnode, dpriv->fd); |
| } |
| |
| return (LIBUSB_SUCCESS); |
| } |
| |
| void |
| obsd_close(struct libusb_device_handle *handle) |
| { |
| struct device_priv *dpriv = usbi_get_device_priv(handle->dev); |
| |
| if (dpriv->devname) { |
| usbi_dbg("close: fd %d", dpriv->fd); |
| |
| close(dpriv->fd); |
| dpriv->fd = -1; |
| } |
| } |
| |
| int |
| obsd_get_device_descriptor(struct libusb_device *dev, unsigned char *buf, |
| int *host_endian) |
| { |
| struct device_priv *dpriv = usbi_get_device_priv(dev); |
| |
| usbi_dbg(" "); |
| |
| memcpy(buf, &dpriv->ddesc, DEVICE_DESC_LENGTH); |
| |
| *host_endian = 0; |
| |
| return (LIBUSB_SUCCESS); |
| } |
| |
| int |
| obsd_get_active_config_descriptor(struct libusb_device *dev, |
| unsigned char *buf, size_t len, int *host_endian) |
| { |
| struct device_priv *dpriv = usbi_get_device_priv(dev); |
| usb_config_descriptor_t *ucd = (usb_config_descriptor_t *)dpriv->cdesc; |
| |
| len = MIN(len, UGETW(ucd->wTotalLength)); |
| |
| usbi_dbg("len %zu", len); |
| |
| memcpy(buf, dpriv->cdesc, len); |
| |
| *host_endian = 0; |
| |
| return (len); |
| } |
| |
| int |
| obsd_get_config_descriptor(struct libusb_device *dev, uint8_t idx, |
| unsigned char *buf, size_t len, int *host_endian) |
| { |
| struct usb_device_fdesc udf; |
| int fd, err; |
| |
| if ((fd = _bus_open(dev->bus_number)) < 0) |
| return _errno_to_libusb(errno); |
| |
| udf.udf_bus = dev->bus_number; |
| udf.udf_addr = dev->device_address; |
| udf.udf_config_index = idx; |
| udf.udf_size = len; |
| udf.udf_data = buf; |
| |
| usbi_dbg("index %d, len %zu", udf.udf_config_index, len); |
| |
| if (ioctl(fd, USB_DEVICE_GET_FDESC, &udf) < 0) { |
| err = errno; |
| close(fd); |
| return _errno_to_libusb(err); |
| } |
| close(fd); |
| |
| *host_endian = 0; |
| |
| return (len); |
| } |
| |
| int |
| obsd_get_configuration(struct libusb_device_handle *handle, int *config) |
| { |
| struct device_priv *dpriv = usbi_get_device_priv(handle->dev); |
| usb_config_descriptor_t *ucd = (usb_config_descriptor_t *)dpriv->cdesc; |
| |
| *config = ucd->bConfigurationValue; |
| |
| usbi_dbg("bConfigurationValue %d", *config); |
| |
| return (LIBUSB_SUCCESS); |
| } |
| |
| int |
| obsd_set_configuration(struct libusb_device_handle *handle, int config) |
| { |
| struct device_priv *dpriv = usbi_get_device_priv(handle->dev); |
| |
| if (dpriv->devname == NULL) |
| return (LIBUSB_ERROR_NOT_SUPPORTED); |
| |
| usbi_dbg("bConfigurationValue %d", config); |
| |
| if (ioctl(dpriv->fd, USB_SET_CONFIG, &config) < 0) |
| return _errno_to_libusb(errno); |
| |
| return _cache_active_config_descriptor(handle->dev); |
| } |
| |
| int |
| obsd_claim_interface(struct libusb_device_handle *handle, int iface) |
| { |
| struct handle_priv *hpriv = usbi_get_device_handle_priv(handle); |
| int i; |
| |
| for (i = 0; i < USB_MAX_ENDPOINTS; i++) |
| hpriv->endpoints[i] = -1; |
| |
| return (LIBUSB_SUCCESS); |
| } |
| |
| int |
| obsd_release_interface(struct libusb_device_handle *handle, int iface) |
| { |
| struct handle_priv *hpriv = usbi_get_device_handle_priv(handle); |
| int i; |
| |
| for (i = 0; i < USB_MAX_ENDPOINTS; i++) |
| if (hpriv->endpoints[i] >= 0) |
| close(hpriv->endpoints[i]); |
| |
| return (LIBUSB_SUCCESS); |
| } |
| |
| int |
| obsd_set_interface_altsetting(struct libusb_device_handle *handle, int iface, |
| int altsetting) |
| { |
| struct device_priv *dpriv = usbi_get_device_priv(handle->dev); |
| struct usb_alt_interface intf; |
| |
| if (dpriv->devname == NULL) |
| return (LIBUSB_ERROR_NOT_SUPPORTED); |
| |
| usbi_dbg("iface %d, setting %d", iface, altsetting); |
| |
| memset(&intf, 0, sizeof(intf)); |
| |
| intf.uai_interface_index = iface; |
| intf.uai_alt_no = altsetting; |
| |
| if (ioctl(dpriv->fd, USB_SET_ALTINTERFACE, &intf) < 0) |
| return _errno_to_libusb(errno); |
| |
| return (LIBUSB_SUCCESS); |
| } |
| |
| int |
| obsd_clear_halt(struct libusb_device_handle *handle, unsigned char endpoint) |
| { |
| struct usb_ctl_request req; |
| int fd, err; |
| |
| if ((fd = _bus_open(handle->dev->bus_number)) < 0) |
| return _errno_to_libusb(errno); |
| |
| usbi_dbg(" "); |
| |
| req.ucr_addr = handle->dev->device_address; |
| req.ucr_request.bmRequestType = UT_WRITE_ENDPOINT; |
| req.ucr_request.bRequest = UR_CLEAR_FEATURE; |
| USETW(req.ucr_request.wValue, UF_ENDPOINT_HALT); |
| USETW(req.ucr_request.wIndex, endpoint); |
| USETW(req.ucr_request.wLength, 0); |
| |
| if (ioctl(fd, USB_REQUEST, &req) < 0) { |
| err = errno; |
| close(fd); |
| return _errno_to_libusb(err); |
| } |
| close(fd); |
| |
| return (LIBUSB_SUCCESS); |
| } |
| |
| void |
| obsd_destroy_device(struct libusb_device *dev) |
| { |
| struct device_priv *dpriv = usbi_get_device_priv(dev); |
| |
| usbi_dbg(" "); |
| |
| free(dpriv->cdesc); |
| free(dpriv->devname); |
| } |
| |
| int |
| obsd_submit_transfer(struct usbi_transfer *itransfer) |
| { |
| struct libusb_transfer *transfer; |
| struct handle_priv *hpriv; |
| int err = 0; |
| |
| usbi_dbg(" "); |
| |
| transfer = USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer); |
| hpriv = usbi_get_device_handle_priv(transfer->dev_handle); |
| |
| switch (transfer->type) { |
| case LIBUSB_TRANSFER_TYPE_CONTROL: |
| err = _sync_control_transfer(itransfer); |
| break; |
| case LIBUSB_TRANSFER_TYPE_ISOCHRONOUS: |
| if (IS_XFEROUT(transfer)) { |
| /* Isochronous write is not supported */ |
| err = LIBUSB_ERROR_NOT_SUPPORTED; |
| break; |
| } |
| err = _sync_gen_transfer(itransfer); |
| break; |
| case LIBUSB_TRANSFER_TYPE_BULK: |
| case LIBUSB_TRANSFER_TYPE_INTERRUPT: |
| if (IS_XFEROUT(transfer) && |
| transfer->flags & LIBUSB_TRANSFER_ADD_ZERO_PACKET) { |
| err = LIBUSB_ERROR_NOT_SUPPORTED; |
| break; |
| } |
| err = _sync_gen_transfer(itransfer); |
| break; |
| case LIBUSB_TRANSFER_TYPE_BULK_STREAM: |
| err = LIBUSB_ERROR_NOT_SUPPORTED; |
| break; |
| } |
| |
| if (err) |
| return (err); |
| |
| usbi_signal_transfer_completion(itransfer); |
| |
| return (LIBUSB_SUCCESS); |
| } |
| |
| int |
| obsd_cancel_transfer(struct usbi_transfer *itransfer) |
| { |
| usbi_dbg(" "); |
| |
| return (LIBUSB_ERROR_NOT_SUPPORTED); |
| } |
| |
| int |
| obsd_handle_transfer_completion(struct usbi_transfer *itransfer) |
| { |
| return usbi_handle_transfer_completion(itransfer, LIBUSB_TRANSFER_COMPLETED); |
| } |
| |
| int |
| _errno_to_libusb(int err) |
| { |
| usbi_dbg("error: %s (%d)", strerror(err), err); |
| |
| switch (err) { |
| case EIO: |
| return (LIBUSB_ERROR_IO); |
| case EACCES: |
| return (LIBUSB_ERROR_ACCESS); |
| case ENOENT: |
| return (LIBUSB_ERROR_NO_DEVICE); |
| case ENOMEM: |
| return (LIBUSB_ERROR_NO_MEM); |
| case ETIMEDOUT: |
| return (LIBUSB_ERROR_TIMEOUT); |
| } |
| |
| return (LIBUSB_ERROR_OTHER); |
| } |
| |
| int |
| _cache_active_config_descriptor(struct libusb_device *dev) |
| { |
| struct device_priv *dpriv = usbi_get_device_priv(dev); |
| struct usb_device_cdesc udc; |
| struct usb_device_fdesc udf; |
| unsigned char* buf; |
| int fd, len, err; |
| |
| if ((fd = _bus_open(dev->bus_number)) < 0) |
| return _errno_to_libusb(errno); |
| |
| usbi_dbg("fd %d, addr %d", fd, dev->device_address); |
| |
| udc.udc_bus = dev->bus_number; |
| udc.udc_addr = dev->device_address; |
| udc.udc_config_index = USB_CURRENT_CONFIG_INDEX; |
| if (ioctl(fd, USB_DEVICE_GET_CDESC, &udc) < 0) { |
| err = errno; |
| close(fd); |
| return _errno_to_libusb(errno); |
| } |
| |
| usbi_dbg("active bLength %d", udc.udc_desc.bLength); |
| |
| len = UGETW(udc.udc_desc.wTotalLength); |
| buf = malloc(len); |
| if (buf == NULL) |
| return (LIBUSB_ERROR_NO_MEM); |
| |
| udf.udf_bus = dev->bus_number; |
| udf.udf_addr = dev->device_address; |
| udf.udf_config_index = udc.udc_config_index; |
| udf.udf_size = len; |
| udf.udf_data = buf; |
| |
| usbi_dbg("index %d, len %d", udf.udf_config_index, len); |
| |
| if (ioctl(fd, USB_DEVICE_GET_FDESC, &udf) < 0) { |
| err = errno; |
| close(fd); |
| free(buf); |
| return _errno_to_libusb(err); |
| } |
| close(fd); |
| |
| if (dpriv->cdesc) |
| free(dpriv->cdesc); |
| dpriv->cdesc = buf; |
| |
| return (LIBUSB_SUCCESS); |
| } |
| |
| int |
| _sync_control_transfer(struct usbi_transfer *itransfer) |
| { |
| struct libusb_transfer *transfer; |
| struct libusb_control_setup *setup; |
| struct device_priv *dpriv; |
| struct usb_ctl_request req; |
| |
| transfer = USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer); |
| dpriv = usbi_get_device_priv(transfer->dev_handle->dev); |
| setup = (struct libusb_control_setup *)transfer->buffer; |
| |
| usbi_dbg("type %x request %x value %x index %d length %d timeout %d", |
| setup->bmRequestType, setup->bRequest, |
| libusb_le16_to_cpu(setup->wValue), |
| libusb_le16_to_cpu(setup->wIndex), |
| libusb_le16_to_cpu(setup->wLength), transfer->timeout); |
| |
| req.ucr_addr = transfer->dev_handle->dev->device_address; |
| req.ucr_request.bmRequestType = setup->bmRequestType; |
| req.ucr_request.bRequest = setup->bRequest; |
| /* Don't use USETW, libusb already deals with the endianness */ |
| (*(uint16_t *)req.ucr_request.wValue) = setup->wValue; |
| (*(uint16_t *)req.ucr_request.wIndex) = setup->wIndex; |
| (*(uint16_t *)req.ucr_request.wLength) = setup->wLength; |
| req.ucr_data = transfer->buffer + LIBUSB_CONTROL_SETUP_SIZE; |
| |
| if ((transfer->flags & LIBUSB_TRANSFER_SHORT_NOT_OK) == 0) |
| req.ucr_flags = USBD_SHORT_XFER_OK; |
| |
| if (dpriv->devname == NULL) { |
| /* |
| * XXX If the device is not attached to ugen(4) it is |
| * XXX still possible to submit a control transfer but |
| * XXX with the default timeout only. |
| */ |
| int fd, err; |
| |
| if ((fd = _bus_open(transfer->dev_handle->dev->bus_number)) < 0) |
| return _errno_to_libusb(errno); |
| |
| if ((ioctl(fd, USB_REQUEST, &req)) < 0) { |
| err = errno; |
| close(fd); |
| return _errno_to_libusb(err); |
| } |
| close(fd); |
| } else { |
| if ((ioctl(dpriv->fd, USB_SET_TIMEOUT, &transfer->timeout)) < 0) |
| return _errno_to_libusb(errno); |
| |
| if ((ioctl(dpriv->fd, USB_DO_REQUEST, &req)) < 0) |
| return _errno_to_libusb(errno); |
| } |
| |
| itransfer->transferred = req.ucr_actlen; |
| |
| usbi_dbg("transferred %d", itransfer->transferred); |
| |
| return (0); |
| } |
| |
| int |
| _access_endpoint(struct libusb_transfer *transfer) |
| { |
| struct handle_priv *hpriv; |
| struct device_priv *dpriv; |
| char devnode[16]; |
| int fd, endpt; |
| mode_t mode; |
| |
| hpriv = usbi_get_device_handle_priv(transfer->dev_handle); |
| dpriv = usbi_get_device_priv(transfer->dev_handle->dev); |
| |
| endpt = UE_GET_ADDR(transfer->endpoint); |
| mode = IS_XFERIN(transfer) ? O_RDONLY : O_WRONLY; |
| |
| usbi_dbg("endpoint %d mode %d", endpt, mode); |
| |
| if (hpriv->endpoints[endpt] < 0) { |
| /* Pick the right endpoint node */ |
| snprintf(devnode, sizeof(devnode), DEVPATH "%s.%02d", |
| dpriv->devname, endpt); |
| |
| /* We may need to read/write to the same endpoint later. */ |
| if (((fd = open(devnode, O_RDWR)) < 0) && (errno == ENXIO)) |
| if ((fd = open(devnode, mode)) < 0) |
| return (-1); |
| |
| hpriv->endpoints[endpt] = fd; |
| } |
| |
| return (hpriv->endpoints[endpt]); |
| } |
| |
| int |
| _sync_gen_transfer(struct usbi_transfer *itransfer) |
| { |
| struct libusb_transfer *transfer; |
| struct device_priv *dpriv; |
| int fd, nr = 1; |
| |
| transfer = USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer); |
| dpriv = usbi_get_device_priv(transfer->dev_handle->dev); |
| |
| if (dpriv->devname == NULL) |
| return (LIBUSB_ERROR_NOT_SUPPORTED); |
| |
| /* |
| * Bulk, Interrupt or Isochronous transfer depends on the |
| * endpoint and thus the node to open. |
| */ |
| if ((fd = _access_endpoint(transfer)) < 0) |
| return _errno_to_libusb(errno); |
| |
| if ((ioctl(fd, USB_SET_TIMEOUT, &transfer->timeout)) < 0) |
| return _errno_to_libusb(errno); |
| |
| if (IS_XFERIN(transfer)) { |
| if ((transfer->flags & LIBUSB_TRANSFER_SHORT_NOT_OK) == 0) |
| if ((ioctl(fd, USB_SET_SHORT_XFER, &nr)) < 0) |
| return _errno_to_libusb(errno); |
| |
| nr = read(fd, transfer->buffer, transfer->length); |
| } else { |
| nr = write(fd, transfer->buffer, transfer->length); |
| } |
| |
| if (nr < 0) |
| return _errno_to_libusb(errno); |
| |
| itransfer->transferred = nr; |
| |
| return (0); |
| } |
| |
| int |
| _bus_open(int number) |
| { |
| char busnode[16]; |
| |
| snprintf(busnode, sizeof(busnode), USBDEV "%d", number); |
| |
| return open(busnode, O_RDWR); |
| } |