diff options
Diffstat (limited to 'libusb/core.c')
| -rw-r--r-- | libusb/core.c | 918 |
1 files changed, 918 insertions, 0 deletions
diff --git a/libusb/core.c b/libusb/core.c new file mode 100644 index 0000000..4182584 --- /dev/null +++ b/libusb/core.c @@ -0,0 +1,918 @@ +/* + * Core functions for libusb-compat-0.1 + * Copyright (C) 2008 Daniel Drake <dsd@gentoo.org> + * Copyright (c) 2000-2003 Johannes Erdfelt <johannes@erdfelt.com> + * + * 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 <errno.h> +#include <stdarg.h> +#include <stdio.h> +#include <string.h> + +#include <libusb.h> + +#include "usb.h" +#include "usbi.h" + +static libusb_context *ctx = NULL; +static int usb_debug = 0; + +enum usbi_log_level { + LOG_LEVEL_DEBUG, + LOG_LEVEL_INFO, + LOG_LEVEL_WARNING, + LOG_LEVEL_ERROR, +}; + +#ifdef ENABLE_LOGGING +#define _usbi_log(level, fmt...) usbi_log(level, __FUNCTION__, fmt) +#else +#define _usbi_log(level, fmt...) +#endif + +#ifdef ENABLE_DEBUG_LOGGING +#define usbi_dbg(fmt...) _usbi_log(LOG_LEVEL_DEBUG, fmt) +#else +#define usbi_dbg(fmt...) +#endif + +#define usbi_info(fmt...) _usbi_log(LOG_LEVEL_INFO, fmt) +#define usbi_warn(fmt...) _usbi_log(LOG_LEVEL_WARNING, fmt) +#define usbi_err(fmt...) _usbi_log(LOG_LEVEL_ERROR, fmt) + +API_EXPORTED struct usb_bus *usb_busses = NULL; + +#define compat_err(e) -(errno=libusb_to_errno(e)) + +static int libusb_to_errno(int result) +{ + switch (result) { + case LIBUSB_SUCCESS: + return 0; + case LIBUSB_ERROR_IO: + return EIO; + case LIBUSB_ERROR_INVALID_PARAM: + return EINVAL; + case LIBUSB_ERROR_ACCESS: + return EACCES; + case LIBUSB_ERROR_NO_DEVICE: + return ENXIO; + case LIBUSB_ERROR_NOT_FOUND: + return ENOENT; + case LIBUSB_ERROR_BUSY: + return EBUSY; + case LIBUSB_ERROR_TIMEOUT: + return ETIMEDOUT; + case LIBUSB_ERROR_OVERFLOW: + return EOVERFLOW; + case LIBUSB_ERROR_PIPE: + return EPIPE; + case LIBUSB_ERROR_INTERRUPTED: + return EINTR; + case LIBUSB_ERROR_NO_MEM: + return ENOMEM; + case LIBUSB_ERROR_NOT_SUPPORTED: + return ENOSYS; + default: + return ERANGE; + } +} + +static void usbi_log(enum usbi_log_level level, const char *function, + const char *format, ...) +{ + va_list args; + FILE *stream = stdout; + const char *prefix; + +#ifndef ENABLE_DEBUG_LOGGING + if (!usb_debug) + return; +#endif + + switch (level) { + case LOG_LEVEL_INFO: + prefix = "info"; + break; + case LOG_LEVEL_WARNING: + stream = stderr; + prefix = "warning"; + break; + case LOG_LEVEL_ERROR: + stream = stderr; + prefix = "error"; + break; + case LOG_LEVEL_DEBUG: + stream = stderr; + prefix = "debug"; + break; + default: + stream = stderr; + prefix = "unknown"; + break; + } + + fprintf(stream, "libusb-compat %s: %s: ", prefix, function); + + va_start (args, format); + vfprintf(stream, format, args); + va_end (args); + + fprintf(stream, "\n"); +} + +API_EXPORTED void usb_init(void) +{ + int r; + usbi_dbg(""); + + if (!ctx) { + r = libusb_init(&ctx); + if (r < 0) { + usbi_err("initialization failed!"); + return; + } + + /* usb_set_debug can be called before usb_init */ + if (usb_debug) + libusb_set_debug(ctx, 3); + } +} + +API_EXPORTED void usb_set_debug(int level) +{ + usb_debug = level; + + /* usb_set_debug can be called before usb_init */ + if (ctx) + libusb_set_debug(ctx, 3); +} + +API_EXPORTED char *usb_strerror(void) +{ + return strerror(errno); +} + +static int find_busses(struct usb_bus **ret) +{ + libusb_device **dev_list = NULL; + struct usb_bus *busses = NULL; + struct usb_bus *bus; + int dev_list_len = 0; + int i; + int r; + + r = libusb_get_device_list(ctx, &dev_list); + if (r < 0) { + usbi_err("get_device_list failed with error %d", r); + return compat_err(r); + } + + if (r == 0) { + libusb_free_device_list(dev_list, 1); + /* no buses */ + return 0; + } + + /* iterate over the device list, identifying the individual busses. + * we use the location field of the usb_bus structure to store the + * bus number. */ + + dev_list_len = r; + for (i = 0; i < dev_list_len; i++) { + libusb_device *dev = dev_list[i]; + uint8_t bus_num = libusb_get_bus_number(dev); + + /* if we already know about it, continue */ + if (busses) { + bus = busses; + int found = 0; + do { + if (bus_num == bus->location) { + found = 1; + break; + } + } while ((bus = bus->next) != NULL); + if (found) + continue; + } + + /* add it to the list of busses */ + bus = malloc(sizeof(*bus)); + if (!bus) + goto err; + + memset(bus, 0, sizeof(*bus)); + bus->location = bus_num; + sprintf(bus->dirname, "%03d", bus_num); + LIST_ADD(busses, bus); + } + + libusb_free_device_list(dev_list, 1); + *ret = busses; + return 0; + +err: + bus = busses; + while (bus) { + struct usb_bus *tbus = bus->next; + free(bus); + bus = tbus; + } + return -ENOMEM; +} + +API_EXPORTED int usb_find_busses(void) +{ + struct usb_bus *new_busses = NULL; + struct usb_bus *bus; + int changes = 0; + int r; + + /* libusb-1.0 initialization might have failed, but we can't indicate + * this with libusb-0.1, so trap that situation here */ + if (!ctx) + return 0; + + usbi_dbg(""); + r = find_busses(&new_busses); + if (r < 0) { + usbi_err("find_busses failed with error %d", r); + return r; + } + + /* walk through all busses we already know about, removing duplicates + * from the new list. if we do not find it in the new list, the bus + * has been removed. */ + + bus = usb_busses; + while (bus) { + struct usb_bus *tbus = bus->next; + struct usb_bus *nbus = new_busses; + int found = 0; + usbi_dbg("in loop"); + +#if 0 /* (yavor) NO caching */ + while (nbus) { + struct usb_bus *tnbus = nbus->next; + + if (bus->location == nbus->location) { + LIST_DEL(new_busses, nbus); + free(nbus); + found = 1; + break; + } + nbus = tnbus; + } +#endif + if (!found) { + /* bus removed */ + usbi_dbg("bus %d removed", bus->location); + changes++; + LIST_DEL(usb_busses, bus); + free(bus); + } + + bus = tbus; + } + + /* anything remaining in new_busses is a new bus */ + bus = new_busses; + while (bus) { + struct usb_bus *tbus = bus->next; + usbi_dbg("bus %d added", bus->location); + LIST_DEL(new_busses, bus); + LIST_ADD(usb_busses, bus); + changes++; + bus = tbus; + } + + return changes; +} + +static int find_devices(libusb_device **dev_list, int dev_list_len, + struct usb_bus *bus, struct usb_device **ret) +{ + struct usb_device *devices = NULL; + struct usb_device *dev; + int i; + + for (i = 0; i < dev_list_len; i++) { + libusb_device *newlib_dev = dev_list[i]; + uint8_t bus_num = libusb_get_bus_number(newlib_dev); + + if (bus_num != bus->location) + continue; + + dev = malloc(sizeof(*dev)); + if (!dev) + goto err; + + /* No need to reference the device now, just take the pointer. We + * increase the reference count later if we keep the device. */ + dev->dev = newlib_dev; + + dev->bus = bus; + dev->devnum = libusb_get_device_address(newlib_dev); + sprintf(dev->filename, "%03d", dev->devnum); + LIST_ADD(devices, dev); + } + + *ret = devices; + return 0; + +err: + dev = devices; + while (dev) { + struct usb_device *tdev = dev->next; + free(dev); + dev = tdev; + } + return -ENOMEM; +} + +static void clear_endpoint_descriptor(struct usb_endpoint_descriptor *ep) +{ + if (ep->extra) + free(ep->extra); +} + +static void clear_interface_descriptor(struct usb_interface_descriptor *iface) +{ + if (iface->extra) + free(iface->extra); + if (iface->endpoint) { + int i; + for (i = 0; i < iface->bNumEndpoints; i++) + clear_endpoint_descriptor(iface->endpoint + i); + free(iface->endpoint); + } +} + +static void clear_interface(struct usb_interface *iface) +{ + if (iface->altsetting) { + int i; + for (i = 0; i < iface->num_altsetting; i++) + clear_interface_descriptor(iface->altsetting + i); + free(iface->altsetting); + } +} + +static void clear_config_descriptor(struct usb_config_descriptor *config) +{ + if (config->extra) + free(config->extra); + if (config->interface) { + int i; + for (i = 0; i < config->bNumInterfaces; i++) + clear_interface(config->interface + i); + free(config->interface); + } +} + +static void clear_device(struct usb_device *dev) +{ + int i; + for (i = 0; i < dev->descriptor.bNumConfigurations; i++) + clear_config_descriptor(dev->config + i); +} + +static int copy_endpoint_descriptor(struct usb_endpoint_descriptor *dest, + const struct libusb_endpoint_descriptor *src) +{ + memcpy(dest, src, USB_DT_ENDPOINT_AUDIO_SIZE); + + dest->extralen = src->extra_length; + if (src->extra_length) { + dest->extra = malloc(src->extra_length); + if (!dest->extra) + return -ENOMEM; + memcpy(dest->extra, src->extra, src->extra_length); + } + + return 0; +} + +static int copy_interface_descriptor(struct usb_interface_descriptor *dest, + const struct libusb_interface_descriptor *src) +{ + int i; + int num_endpoints = src->bNumEndpoints; + size_t alloc_size = sizeof(struct usb_endpoint_descriptor) * num_endpoints; + + memcpy(dest, src, USB_DT_INTERFACE_SIZE); + dest->endpoint = malloc(alloc_size); + if (!dest->endpoint) + return -ENOMEM; + memset(dest->endpoint, 0, alloc_size); + + for (i = 0; i < num_endpoints; i++) { + int r = copy_endpoint_descriptor(dest->endpoint + i, &src->endpoint[i]); + if (r < 0) { + clear_interface_descriptor(dest); + return r; + } + } + + dest->extralen = src->extra_length; + if (src->extra_length) { + dest->extra = malloc(src->extra_length); + if (!dest->extra) { + clear_interface_descriptor(dest); + return -ENOMEM; + } + memcpy(dest->extra, src->extra, src->extra_length); + } + + return 0; +} + +static int copy_interface(struct usb_interface *dest, + const struct libusb_interface *src) +{ + int i; + int num_altsetting = src->num_altsetting; + size_t alloc_size = sizeof(struct usb_interface_descriptor) + * num_altsetting; + + dest->num_altsetting = num_altsetting; + dest->altsetting = malloc(alloc_size); + if (!dest->altsetting) + return -ENOMEM; + memset(dest->altsetting, 0, alloc_size); + + for (i = 0; i < num_altsetting; i++) { + int r = copy_interface_descriptor(dest->altsetting + i, + &src->altsetting[i]); + if (r < 0) { + clear_interface(dest); + return r; + } + } + + return 0; +} + +static int copy_config_descriptor(struct usb_config_descriptor *dest, + const struct libusb_config_descriptor *src) +{ + int i; + int num_interfaces = src->bNumInterfaces; + size_t alloc_size = sizeof(struct usb_interface) * num_interfaces; + + memcpy(dest, src, USB_DT_CONFIG_SIZE); + dest->interface = malloc(alloc_size); + if (!dest->interface) + return -ENOMEM; + memset(dest->interface, 0, alloc_size); + + for (i = 0; i < num_interfaces; i++) { + int r = copy_interface(dest->interface + i, &src->interface[i]); + if (r < 0) { + clear_config_descriptor(dest); + return r; + } + } + + dest->extralen = src->extra_length; + if (src->extra_length) { + dest->extra = malloc(src->extra_length); + if (!dest->extra) { + clear_config_descriptor(dest); + return -ENOMEM; + } + memcpy(dest->extra, src->extra, src->extra_length); + } + + return 0; +} + +static int initialize_device(struct usb_device *dev) +{ + libusb_device *newlib_dev = dev->dev; + int num_configurations; + size_t alloc_size; + int r; + int i; + + /* device descriptor is identical in both libs */ + r = libusb_get_device_descriptor(newlib_dev, + (struct libusb_device_descriptor *) &dev->descriptor); + if (r < 0) { + usbi_err("error %d getting device descriptor", r); + return compat_err(r); + } + + num_configurations = dev->descriptor.bNumConfigurations; + alloc_size = sizeof(struct usb_config_descriptor) * num_configurations; + dev->config = malloc(alloc_size); + if (!dev->config) + return -ENOMEM; + memset(dev->config, 0, alloc_size); + + /* even though structures are identical, we can't just use libusb-1.0's + * config descriptors because we have to store all configurations in + * a single flat memory area (libusb-1.0 provides separate allocations). + * we hand-copy libusb-1.0's descriptors into our own structures. */ + for (i = 0; i < num_configurations; i++) { + struct libusb_config_descriptor *newlib_config; + r = libusb_get_config_descriptor(newlib_dev, i, &newlib_config); + if (r < 0) { + clear_device(dev); + free(dev->config); + return compat_err(r); + } + r = copy_config_descriptor(dev->config + i, newlib_config); + libusb_free_config_descriptor(newlib_config); + if (r < 0) { + clear_device(dev); + free(dev->config); + return r; + } + } + + /* libusb doesn't implement this and it doesn't seem that important. If + * someone asks for it, we can implement it in v1.1 or later. */ + dev->num_children = 0; + dev->children = NULL; + + libusb_ref_device(newlib_dev); + return 0; +} + +static void free_device(struct usb_device *dev) +{ + clear_device(dev); + libusb_unref_device(dev->dev); + free(dev); +} + +API_EXPORTED int usb_find_devices(void) +{ + struct usb_bus *bus; + libusb_device **dev_list; + int dev_list_len; + int r; + int changes = 0; + + /* libusb-1.0 initialization might have failed, but we can't indicate + * this with libusb-0.1, so trap that situation here */ + if (!ctx) + return 0; + + usbi_dbg(""); + dev_list_len = libusb_get_device_list(ctx, &dev_list); + if (dev_list_len < 0) + return compat_err(dev_list_len); + + for (bus = usb_busses; bus; bus = bus->next) { + struct usb_device *new_devices = NULL; + struct usb_device *dev; + + r = find_devices(dev_list, dev_list_len, bus, &new_devices); + if (r < 0) { + libusb_free_device_list(dev_list, 1); + return r; + } + + /* walk through the devices we already know about, removing duplicates + * from the new list. if we do not find it in the new list, the device + * has been removed. */ + dev = bus->devices; + while (dev) { + int found = 0; + struct usb_device *tdev = dev->next; + struct usb_device *ndev = new_devices; + + while (ndev) { + if (ndev->devnum == dev->devnum) { + LIST_DEL(new_devices, ndev); + free(ndev); + found = 1; + break; + } + ndev = ndev->next; + } + + if (!found) { + usbi_dbg("device %d.%d removed", + dev->bus->location, dev->devnum); + LIST_DEL(bus->devices, dev); + free_device(dev); + changes++; + } + + dev = tdev; + } + + /* anything left in new_devices is a new device */ + dev = new_devices; + while (dev) { + struct usb_device *tdev = dev->next; + r = initialize_device(dev); + if (r < 0) { + usbi_err("couldn't initialize device %d.%d (error %d)", + dev->bus->location, dev->devnum, r); + dev = tdev; + continue; + } + usbi_dbg("device %d.%d added", dev->bus->location, dev->devnum); + LIST_DEL(new_devices, dev); + LIST_ADD(bus->devices, dev); + changes++; + dev = tdev; + } + } + + libusb_free_device_list(dev_list, 1); + return changes; +} + +API_EXPORTED struct usb_bus *usb_get_busses(void) +{ + return usb_busses; +} + +API_EXPORTED usb_dev_handle *usb_open(struct usb_device *dev) +{ + int r; + usbi_dbg(""); + + usb_dev_handle *udev = malloc(sizeof(*udev)); + if (!udev) + return NULL; + + r = libusb_open((libusb_device *) dev->dev, &udev->handle); + if (r < 0) { + usbi_err("could not open device, error %d", r); + free(udev); + errno = libusb_to_errno(r); + return NULL; + } + + udev->last_claimed_interface = -1; + udev->device = dev; + return udev; +} + +API_EXPORTED int usb_close(usb_dev_handle *dev) +{ + usbi_dbg(""); + libusb_close(dev->handle); + free(dev); + return 0; +} + +API_EXPORTED struct usb_device *usb_device(usb_dev_handle *dev) +{ + return dev->device; +} + +API_EXPORTED int usb_set_configuration(usb_dev_handle *dev, int configuration) +{ + usbi_dbg("configuration %d", configuration); + return compat_err(libusb_set_configuration(dev->handle, configuration)); +} + +API_EXPORTED int usb_claim_interface(usb_dev_handle *dev, int interface) +{ + int r; + usbi_dbg("interface %d", interface); + + r = libusb_claim_interface(dev->handle, interface); + if (r == 0) { + dev->last_claimed_interface = interface; + return 0; + } + + return compat_err(r); +} + +API_EXPORTED int usb_release_interface(usb_dev_handle *dev, int interface) +{ + int r; + usbi_dbg("interface %d", interface); + + r = libusb_release_interface(dev->handle, interface); + if (r == 0) + dev->last_claimed_interface = -1; + + return compat_err(r); +} + +API_EXPORTED int usb_set_altinterface(usb_dev_handle *dev, int alternate) +{ + usbi_dbg("alternate %d", alternate); + if (dev->last_claimed_interface < 0) + return -(errno=EINVAL); + + return compat_err(libusb_set_interface_alt_setting(dev->handle, + dev->last_claimed_interface, alternate)); +} + +API_EXPORTED int usb_resetep(usb_dev_handle *dev, unsigned int ep) +{ + return compat_err(usb_clear_halt(dev, ep)); +} + +API_EXPORTED int usb_clear_halt(usb_dev_handle *dev, unsigned int ep) +{ + usbi_dbg("endpoint %x", ep); + return compat_err(libusb_clear_halt(dev->handle, ep & 0xff)); +} + +API_EXPORTED int usb_reset(usb_dev_handle *dev) +{ + usbi_dbg(""); + return compat_err(libusb_reset_device(dev->handle)); +} + +static int usb_bulk_io(usb_dev_handle *dev, int ep, char *bytes, + int size, int timeout) +{ + int actual_length; + int r; + usbi_dbg("endpoint %x size %d timeout %d", ep, size, timeout); + r = libusb_bulk_transfer(dev->handle, ep & 0xff, bytes, size, + &actual_length, timeout); + + /* if we timed out but did transfer some data, report as successful short + * read. FIXME: is this how libusb-0.1 works? */ + if (r == 0 || (r == LIBUSB_ERROR_TIMEOUT && actual_length > 0)) + return actual_length; + + return compat_err(r); +} + +API_EXPORTED int usb_bulk_read(usb_dev_handle *dev, int ep, char *bytes, + int size, int timeout) +{ + if (!(ep & USB_ENDPOINT_IN)) { + /* libusb-0.1 will strangely fix up a read request from endpoint + * 0x01 to be from endpoint 0x81. do the same thing here, but + * warn about this silly behaviour. */ + usbi_warn("endpoint %x is missing IN direction bit, fixing"); + ep |= USB_ENDPOINT_IN; + } + + return usb_bulk_io(dev, ep, bytes, size, timeout); +} + +API_EXPORTED int usb_bulk_write(usb_dev_handle *dev, int ep, char *bytes, + int size, int timeout) +{ + if (ep & USB_ENDPOINT_IN) { + /* libusb-0.1 on BSD strangely fix up a write request to endpoint + * 0x81 to be to endpoint 0x01. do the same thing here, but + * warn about this silly behaviour. */ + usbi_warn("endpoint %x has excessive IN direction bit, fixing"); + ep &= ~USB_ENDPOINT_IN; + } + + return usb_bulk_io(dev, ep, bytes, size, timeout); +} + +static int usb_interrupt_io(usb_dev_handle *dev, int ep, char *bytes, + int size, int timeout) +{ + int actual_length; + int r; + usbi_dbg("endpoint %x size %d timeout %d", ep, size, timeout); + r = libusb_interrupt_transfer(dev->handle, ep & 0xff, bytes, size, + &actual_length, timeout); + + /* if we timed out but did transfer some data, report as successful short + * read. FIXME: is this how libusb-0.1 works? */ + if (r == 0 || (r == LIBUSB_ERROR_TIMEOUT && actual_length > 0)) + return actual_length; + + return compat_err(r); +} + +API_EXPORTED int usb_interrupt_read(usb_dev_handle *dev, int ep, char *bytes, + int size, int timeout) +{ + if (!(ep & USB_ENDPOINT_IN)) { + /* libusb-0.1 will strangely fix up a read request from endpoint + * 0x01 to be from endpoint 0x81. do the same thing here, but + * warn about this silly behaviour. */ + usbi_warn("endpoint %x is missing IN direction bit, fixing"); + ep |= USB_ENDPOINT_IN; + } + return usb_interrupt_io(dev, ep, bytes, size, timeout); +} + +API_EXPORTED int usb_interrupt_write(usb_dev_handle *dev, int ep, char *bytes, + int size, int timeout) +{ + if (ep & USB_ENDPOINT_IN) { + /* libusb-0.1 on BSD strangely fix up a write request to endpoint + * 0x81 to be to endpoint 0x01. do the same thing here, but + * warn about this silly behaviour. */ + usbi_warn("endpoint %x has excessive IN direction bit, fixing"); + ep &= ~USB_ENDPOINT_IN; + } + + return usb_interrupt_io(dev, ep, bytes, size, timeout); +} + +API_EXPORTED int usb_control_msg(usb_dev_handle *dev, int bmRequestType, + int bRequest, int wValue, int wIndex, char *bytes, int size, int timeout) +{ + int r; + usbi_dbg("RQT=%x RQ=%x V=%x I=%x len=%d timeout=%d", bmRequestType, + bRequest, wValue, wIndex, size, timeout); + + r = libusb_control_transfer(dev->handle, bmRequestType & 0xff, + bRequest & 0xff, wValue & 0xffff, wIndex & 0xffff, bytes, size & 0xffff, + timeout); + + if (r >= 0) + return r; + + return compat_err(r); +} + +API_EXPORTED int usb_get_string(usb_dev_handle *dev, int desc_index, int langid, + char *buf, size_t buflen) +{ + int r; + r = libusb_get_string_descriptor(dev->handle, desc_index & 0xff, + langid & 0xffff, buf, (int) buflen); + if (r >= 0) + return r; + return compat_err(r); +} + +API_EXPORTED int usb_get_string_simple(usb_dev_handle *dev, int desc_index, + char *buf, size_t buflen) +{ + int r; + r = libusb_get_string_descriptor_ascii(dev->handle, desc_index & 0xff, + buf, (int) buflen); + if (r >= 0) + return r; + return compat_err(r); +} + +API_EXPORTED int usb_get_descriptor(usb_dev_handle *dev, unsigned char type, + unsigned char desc_index, void *buf, int size) +{ + int r; + r = libusb_get_descriptor(dev->handle, type, desc_index, buf, size); + if (r >= 0) + return r; + return compat_err(r); +} + +API_EXPORTED int usb_get_descriptor_by_endpoint(usb_dev_handle *dev, int ep, + unsigned char type, unsigned char desc_index, void *buf, int size) +{ + /* this function doesn't make much sense - the specs don't talk about + * getting a descriptor "by endpoint". libusb-1.0 does not provide this + * functionality so we just send a control message directly */ + int r; + r = libusb_control_transfer(dev->handle, + LIBUSB_ENDPOINT_IN | (ep & 0xff), LIBUSB_REQUEST_GET_DESCRIPTOR, + (type << 8) | desc_index, 0, buf, size, 1000); + if (r >= 0) + return r; + return compat_err(r); +} + +API_EXPORTED int usb_get_driver_np(usb_dev_handle *dev, int interface, + char *name, unsigned int namelen) +{ + int r = libusb_kernel_driver_active(dev->handle, interface); + if (r == 1) { + /* libusb-1.0 doesn't expose driver name, so fill in a dummy value */ + snprintf(name, namelen, "dummy"); + return 0; + } else if (r == 0) { + return -(errno=ENODATA); + } else { + return compat_err(r); + } +} + +API_EXPORTED int usb_detach_kernel_driver_np(usb_dev_handle *dev, int interface) +{ + return compat_err(libusb_detach_kernel_driver(dev->handle, interface)); +} + |