1 /* -*- Mode: C; c-basic-offset:8 ; indent-tabs-mode:t -*- */
3 * Linux usbfs backend for libusb
4 * Copyright © 2007-2009 Daniel Drake <dsd@gentoo.org>
5 * Copyright © 2001 Johannes Erdfelt <johannes@erdfelt.com>
6 * Copyright © 2013 Nathan Hjelm <hjelmn@mac.com>
7 * Copyright © 2012-2013 Hans de Goede <hdegoede@redhat.com>
9 * This library is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU Lesser General Public
11 * License as published by the Free Software Foundation; either
12 * version 2.1 of the License, or (at your option) any later version.
14 * This library is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * Lesser General Public License for more details.
19 * You should have received a copy of the GNU Lesser General Public
20 * License along with this library; if not, write to the Free Software
21 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
35 #include <sys/ioctl.h>
37 #include <sys/types.h>
38 #include <sys/utsname.h>
42 #include "linux_usbfs.h"
45 * opening a usbfs node causes the device to be resumed, so we attempt to
46 * avoid this during enumeration.
48 * sysfs allows us to read the kernel's in-memory copies of device descriptors
49 * and so forth, avoiding the need to open the device:
50 * - The binary "descriptors" file contains all config descriptors since
51 * 2.6.26, commit 217a9081d8e69026186067711131b77f0ce219ed
52 * - The binary "descriptors" file was added in 2.6.23, commit
53 * 69d42a78f935d19384d1f6e4f94b65bb162b36df, but it only contains the
54 * active config descriptors
55 * - The "busnum" file was added in 2.6.22, commit
56 * 83f7d958eab2fbc6b159ee92bf1493924e1d0f72
57 * - The "devnum" file has been present since pre-2.6.18
58 * - the "bConfigurationValue" file has been present since pre-2.6.18
60 * If we have bConfigurationValue, busnum, and devnum, then we can determine
61 * the active configuration without having to open the usbfs node in RDWR mode.
62 * The busnum file is important as that is the only way we can relate sysfs
63 * devices to usbfs nodes.
65 * If we also have all descriptors, we can obtain the device descriptor and
66 * configuration without touching usbfs at all.
69 /* endianness for multi-byte fields:
71 * Descriptors exposed by usbfs have the multi-byte fields in the device
72 * descriptor as host endian. Multi-byte fields in the other descriptors are
73 * bus-endian. The kernel documentation says otherwise, but it is wrong.
75 * In sysfs all descriptors are bus-endian.
78 static const char *usbfs_path = NULL;
80 /* use usbdev*.* device names in /dev instead of the usbfs bus directories */
81 static int usbdev_names = 0;
83 /* Linux 2.6.32 adds support for a bulk continuation URB flag. this basically
84 * allows us to mark URBs as being part of a specific logical transfer when
85 * we submit them to the kernel. then, on any error except a cancellation, all
86 * URBs within that transfer will be cancelled and no more URBs will be
87 * accepted for the transfer, meaning that no more data can creep in.
89 * The BULK_CONTINUATION flag must be set on all URBs within a bulk transfer
90 * (in either direction) except the first.
91 * For IN transfers, we must also set SHORT_NOT_OK on all URBs except the
92 * last; it means that the kernel should treat a short reply as an error.
93 * For OUT transfers, SHORT_NOT_OK must not be set. it isn't needed (OUT
94 * transfers can't be short unless there's already some sort of error), and
95 * setting this flag is disallowed (a kernel with USB debugging enabled will
98 static int supports_flag_bulk_continuation = -1;
100 /* Linux 2.6.31 fixes support for the zero length packet URB flag. This
101 * allows us to mark URBs that should be followed by a zero length data
102 * packet, which can be required by device- or class-specific protocols.
104 static int supports_flag_zero_packet = -1;
106 /* clock ID for monotonic clock, as not all clock sources are available on all
107 * systems. appropriate choice made at initialization time. */
108 static clockid_t monotonic_clkid = -1;
110 /* Linux 2.6.22 (commit 83f7d958eab2fbc6b159ee92bf1493924e1d0f72) adds a busnum
111 * to sysfs, so we can relate devices. This also implies that we can read
112 * the active configuration through bConfigurationValue */
113 static int sysfs_can_relate_devices = -1;
115 /* Linux 2.6.26 (commit 217a9081d8e69026186067711131b77f0ce219ed) adds all
116 * config descriptors (rather then just the active config) to the sysfs
117 * descriptors file, so from then on we can use them. */
118 static int sysfs_has_descriptors = -1;
120 /* how many times have we initted (and not exited) ? */
121 static int init_count = 0;
123 /* Serialize hotplug start/stop */
124 static usbi_mutex_static_t linux_hotplug_startstop_lock = USBI_MUTEX_INITIALIZER;
125 /* Serialize scan-devices, event-thread, and poll */
126 usbi_mutex_static_t linux_hotplug_lock = USBI_MUTEX_INITIALIZER;
128 static int linux_start_event_monitor(void);
129 static int linux_stop_event_monitor(void);
130 static int linux_scan_devices(struct libusb_context *ctx);
131 static int sysfs_scan_device(struct libusb_context *ctx, const char *devname);
132 static int detach_kernel_driver_and_claim(struct libusb_device_handle *, int);
134 #if !defined(USE_UDEV)
135 static int linux_default_scan_devices (struct libusb_context *ctx);
138 struct linux_device_priv {
140 unsigned char *descriptors;
142 int active_config; /* cache val for !sysfs_can_relate_devices */
145 struct linux_device_handle_priv {
153 /* submission failed after the first URB, so await cancellation/completion
154 * of all the others */
157 /* cancelled by user or timeout */
160 /* completed multi-URB transfer in non-final URB */
163 /* one or more urbs encountered a low-level error */
167 struct linux_transfer_priv {
169 struct usbfs_urb *urbs;
170 struct usbfs_urb **iso_urbs;
173 enum reap_action reap_action;
176 enum libusb_transfer_status reap_status;
178 /* next iso packet in user-supplied transfer to be populated */
179 int iso_packet_offset;
182 static int _get_usbfs_fd(struct libusb_device *dev, mode_t mode, int silent)
184 struct libusb_context *ctx = DEVICE_CTX(dev);
190 snprintf(path, PATH_MAX, "%s/usbdev%d.%d",
191 usbfs_path, dev->bus_number, dev->device_address);
193 snprintf(path, PATH_MAX, "%s/%03d/%03d",
194 usbfs_path, dev->bus_number, dev->device_address);
196 fd = open(path, mode);
198 return fd; /* Success */
200 if (errno == ENOENT) {
202 usbi_err(ctx, "File doesn't exist, wait %d ms and try again", delay/1000);
204 /* Wait 10ms for USB device path creation.*/
207 fd = open(path, mode);
209 return fd; /* Success */
213 usbi_err(ctx, "libusb couldn't open USB device %s: %s",
214 path, strerror(errno));
215 if (errno == EACCES && mode == O_RDWR)
216 usbi_err(ctx, "libusb requires write access to USB "
221 return LIBUSB_ERROR_ACCESS;
223 return LIBUSB_ERROR_NO_DEVICE;
224 return LIBUSB_ERROR_IO;
227 static struct linux_device_priv *_device_priv(struct libusb_device *dev)
229 return (struct linux_device_priv *) dev->os_priv;
232 static struct linux_device_handle_priv *_device_handle_priv(
233 struct libusb_device_handle *handle)
235 return (struct linux_device_handle_priv *) handle->os_priv;
238 /* check dirent for a /dev/usbdev%d.%d name
239 * optionally return bus/device on success */
240 static int _is_usbdev_entry(struct dirent *entry, int *bus_p, int *dev_p)
244 if (sscanf(entry->d_name, "usbdev%d.%d", &busnum, &devnum) != 2)
247 usbi_dbg("found: %s", entry->d_name);
255 static int check_usb_vfs(const char *dirname)
258 struct dirent *entry;
261 dir = opendir(dirname);
265 while ((entry = readdir(dir)) != NULL) {
266 if (entry->d_name[0] == '.')
269 /* We assume if we find any files that it must be the right place */
278 static const char *find_usbfs_path(void)
280 const char *path = "/dev/bus/usb";
281 const char *ret = NULL;
283 if (check_usb_vfs(path)) {
286 path = "/proc/bus/usb";
287 if (check_usb_vfs(path))
291 /* look for /dev/usbdev*.* if the normal places fail */
293 struct dirent *entry;
299 while ((entry = readdir(dir)) != NULL) {
300 if (_is_usbdev_entry(entry, NULL, NULL)) {
301 /* found one; that's enough */
311 /* On udev based systems without any usb-devices /dev/bus/usb will not
312 * exist. So if we've not found anything and we're using udev for hotplug
313 * simply assume /dev/bus/usb rather then making libusb_init fail. */
314 #if defined(USE_UDEV)
316 ret = "/dev/bus/usb";
320 usbi_dbg("found usbfs at %s", ret);
325 /* the monotonic clock is not usable on all systems (e.g. embedded ones often
326 * seem to lack it). fall back to REALTIME if we have to. */
327 static clockid_t find_monotonic_clock(void)
329 #ifdef CLOCK_MONOTONIC
333 /* Linux 2.6.28 adds CLOCK_MONOTONIC_RAW but we don't use it
334 * because it's not available through timerfd */
335 r = clock_gettime(CLOCK_MONOTONIC, &ts);
337 return CLOCK_MONOTONIC;
338 usbi_dbg("monotonic clock doesn't work, errno %d", errno);
341 return CLOCK_REALTIME;
344 static int kernel_version_ge(int major, int minor, int sublevel)
347 int atoms, kmajor, kminor, ksublevel;
351 atoms = sscanf(uts.release, "%d.%d.%d", &kmajor, &kminor, &ksublevel);
360 /* kmajor == major */
362 return 0 == minor && 0 == sublevel;
368 /* kminor == minor */
370 return 0 == sublevel;
372 return ksublevel >= sublevel;
375 static int op_init(struct libusb_context *ctx)
380 usbfs_path = find_usbfs_path();
382 usbi_err(ctx, "could not find usbfs");
383 return LIBUSB_ERROR_OTHER;
386 if (monotonic_clkid == -1)
387 monotonic_clkid = find_monotonic_clock();
389 if (supports_flag_bulk_continuation == -1) {
390 /* bulk continuation URB flag available from Linux 2.6.32 */
391 supports_flag_bulk_continuation = kernel_version_ge(2,6,32);
392 if (supports_flag_bulk_continuation == -1) {
393 usbi_err(ctx, "error checking for bulk continuation support");
394 return LIBUSB_ERROR_OTHER;
398 if (supports_flag_bulk_continuation)
399 usbi_dbg("bulk continuation flag supported");
401 if (-1 == supports_flag_zero_packet) {
402 /* zero length packet URB flag fixed since Linux 2.6.31 */
403 supports_flag_zero_packet = kernel_version_ge(2,6,31);
404 if (-1 == supports_flag_zero_packet) {
405 usbi_err(ctx, "error checking for zero length packet support");
406 return LIBUSB_ERROR_OTHER;
410 if (supports_flag_zero_packet)
411 usbi_dbg("zero length packet flag supported");
413 if (-1 == sysfs_has_descriptors) {
414 /* sysfs descriptors has all descriptors since Linux 2.6.26 */
415 sysfs_has_descriptors = kernel_version_ge(2,6,26);
416 if (-1 == sysfs_has_descriptors) {
417 usbi_err(ctx, "error checking for sysfs descriptors");
418 return LIBUSB_ERROR_OTHER;
422 if (-1 == sysfs_can_relate_devices) {
423 /* sysfs has busnum since Linux 2.6.22 */
424 sysfs_can_relate_devices = kernel_version_ge(2,6,22);
425 if (-1 == sysfs_can_relate_devices) {
426 usbi_err(ctx, "error checking for sysfs busnum");
427 return LIBUSB_ERROR_OTHER;
431 if (sysfs_can_relate_devices || sysfs_has_descriptors) {
432 r = stat(SYSFS_DEVICE_PATH, &statbuf);
433 if (r != 0 || !S_ISDIR(statbuf.st_mode)) {
434 usbi_warn(ctx, "sysfs not mounted");
435 sysfs_can_relate_devices = 0;
436 sysfs_has_descriptors = 0;
440 if (sysfs_can_relate_devices)
441 usbi_dbg("sysfs can relate devices");
443 if (sysfs_has_descriptors)
444 usbi_dbg("sysfs has complete descriptors");
446 usbi_mutex_static_lock(&linux_hotplug_startstop_lock);
448 if (init_count == 0) {
449 /* start up hotplug event handler */
450 r = linux_start_event_monitor();
452 if (r == LIBUSB_SUCCESS) {
453 r = linux_scan_devices(ctx);
454 if (r == LIBUSB_SUCCESS)
456 else if (init_count == 0)
457 linux_stop_event_monitor();
459 usbi_err(ctx, "error starting hotplug event monitor");
460 usbi_mutex_static_unlock(&linux_hotplug_startstop_lock);
465 static void op_exit(void)
467 usbi_mutex_static_lock(&linux_hotplug_startstop_lock);
468 assert(init_count != 0);
470 /* tear down event handler */
471 (void)linux_stop_event_monitor();
473 usbi_mutex_static_unlock(&linux_hotplug_startstop_lock);
476 static int linux_start_event_monitor(void)
478 #if defined(USE_UDEV)
479 return linux_udev_start_event_monitor();
481 return linux_netlink_start_event_monitor();
485 static int linux_stop_event_monitor(void)
487 #if defined(USE_UDEV)
488 return linux_udev_stop_event_monitor();
490 return linux_netlink_stop_event_monitor();
494 static int linux_scan_devices(struct libusb_context *ctx)
498 usbi_mutex_static_lock(&linux_hotplug_lock);
500 #if defined(USE_UDEV)
501 ret = linux_udev_scan_devices(ctx);
503 ret = linux_default_scan_devices(ctx);
506 usbi_mutex_static_unlock(&linux_hotplug_lock);
511 static void op_hotplug_poll(void)
513 #if defined(USE_UDEV)
514 linux_udev_hotplug_poll();
516 linux_netlink_hotplug_poll();
520 static int _open_sysfs_attr(struct libusb_device *dev, const char *attr)
522 struct linux_device_priv *priv = _device_priv(dev);
523 char filename[PATH_MAX];
526 snprintf(filename, PATH_MAX, "%s/%s/%s",
527 SYSFS_DEVICE_PATH, priv->sysfs_dir, attr);
528 fd = open(filename, O_RDONLY);
530 usbi_err(DEVICE_CTX(dev),
531 "open %s failed ret=%d errno=%d", filename, fd, errno);
532 return LIBUSB_ERROR_IO;
538 /* Note only suitable for attributes which always read >= 0, < 0 is error */
539 static int __read_sysfs_attr(struct libusb_context *ctx,
540 const char *devname, const char *attr)
542 char filename[PATH_MAX];
546 snprintf(filename, PATH_MAX, "%s/%s/%s", SYSFS_DEVICE_PATH,
548 f = fopen(filename, "r");
550 if (errno == ENOENT) {
551 /* File doesn't exist. Assume the device has been
552 disconnected (see trac ticket #70). */
553 return LIBUSB_ERROR_NO_DEVICE;
555 usbi_err(ctx, "open %s failed errno=%d", filename, errno);
556 return LIBUSB_ERROR_IO;
559 r = fscanf(f, "%d", &value);
562 usbi_err(ctx, "fscanf %s returned %d, errno=%d", attr, r, errno);
563 return LIBUSB_ERROR_NO_DEVICE; /* For unplug race (trac #70) */
566 usbi_err(ctx, "%s contains a negative value", filename);
567 return LIBUSB_ERROR_IO;
573 static int op_get_device_descriptor(struct libusb_device *dev,
574 unsigned char *buffer, int *host_endian)
576 struct linux_device_priv *priv = _device_priv(dev);
578 *host_endian = sysfs_has_descriptors ? 0 : 1;
579 memcpy(buffer, priv->descriptors, DEVICE_DESC_LENGTH);
584 /* read the bConfigurationValue for a device */
585 static int sysfs_get_active_config(struct libusb_device *dev, int *config)
588 char tmp[5] = {0, 0, 0, 0, 0};
593 fd = _open_sysfs_attr(dev, "bConfigurationValue");
597 r = read(fd, tmp, sizeof(tmp));
600 usbi_err(DEVICE_CTX(dev),
601 "read bConfigurationValue failed ret=%d errno=%d", r, errno);
602 return LIBUSB_ERROR_IO;
604 usbi_dbg("device unconfigured");
609 if (tmp[sizeof(tmp) - 1] != 0) {
610 usbi_err(DEVICE_CTX(dev), "not null-terminated?");
611 return LIBUSB_ERROR_IO;
612 } else if (tmp[0] == 0) {
613 usbi_err(DEVICE_CTX(dev), "no configuration value?");
614 return LIBUSB_ERROR_IO;
617 num = strtol(tmp, &endptr, 10);
619 usbi_err(DEVICE_CTX(dev), "error converting '%s' to integer", tmp);
620 return LIBUSB_ERROR_IO;
627 int linux_get_device_address (struct libusb_context *ctx, int detached,
628 uint8_t *busnum, uint8_t *devaddr,const char *dev_node,
629 const char *sys_name)
633 usbi_dbg("getting address for device: %s detached: %d", sys_name, detached);
634 /* can't use sysfs to read the bus and device number if the
635 * device has been detached */
636 if (!sysfs_can_relate_devices || detached || NULL == sys_name) {
637 if (NULL == dev_node) {
638 return LIBUSB_ERROR_OTHER;
641 /* will this work with all supported kernel versions? */
642 if (!strncmp(dev_node, "/dev/bus/usb", 12)) {
643 sscanf (dev_node, "/dev/bus/usb/%hhu/%hhu", busnum, devaddr);
644 } else if (!strncmp(dev_node, "/proc/bus/usb", 13)) {
645 sscanf (dev_node, "/proc/bus/usb/%hhu/%hhu", busnum, devaddr);
648 return LIBUSB_SUCCESS;
651 usbi_dbg("scan %s", sys_name);
653 sysfs_attr = __read_sysfs_attr(ctx, sys_name, "busnum");
656 if (sysfs_attr > 255)
657 return LIBUSB_ERROR_INVALID_PARAM;
658 *busnum = (uint8_t) sysfs_attr;
660 sysfs_attr = __read_sysfs_attr(ctx, sys_name, "devnum");
663 if (sysfs_attr > 255)
664 return LIBUSB_ERROR_INVALID_PARAM;
666 *devaddr = (uint8_t) sysfs_attr;
668 usbi_dbg("bus=%d dev=%d", *busnum, *devaddr);
670 return LIBUSB_SUCCESS;
673 /* Return offset of the next descriptor with the given type */
674 static int seek_to_next_descriptor(struct libusb_context *ctx,
675 uint8_t descriptor_type, unsigned char *buffer, int size)
677 struct usb_descriptor_header header;
680 for (i = 0; size >= 0; i += header.bLength, size -= header.bLength) {
682 return LIBUSB_ERROR_NOT_FOUND;
685 usbi_err(ctx, "short descriptor read %d/2", size);
686 return LIBUSB_ERROR_IO;
688 usbi_parse_descriptor(buffer + i, "bb", &header, 0);
690 if (i && header.bDescriptorType == descriptor_type)
693 usbi_err(ctx, "bLength overflow by %d bytes", -size);
694 return LIBUSB_ERROR_IO;
697 /* Return offset to next config */
698 static int seek_to_next_config(struct libusb_context *ctx,
699 unsigned char *buffer, int size)
701 struct libusb_config_descriptor config;
704 return LIBUSB_ERROR_NOT_FOUND;
706 if (size < LIBUSB_DT_CONFIG_SIZE) {
707 usbi_err(ctx, "short descriptor read %d/%d",
708 size, LIBUSB_DT_CONFIG_SIZE);
709 return LIBUSB_ERROR_IO;
712 usbi_parse_descriptor(buffer, "bbwbbbbb", &config, 0);
713 if (config.bDescriptorType != LIBUSB_DT_CONFIG) {
714 usbi_err(ctx, "descriptor is not a config desc (type 0x%02x)",
715 config.bDescriptorType);
716 return LIBUSB_ERROR_IO;
720 * In usbfs the config descriptors are config.wTotalLength bytes apart,
721 * with any short reads from the device appearing as holes in the file.
723 * In sysfs wTotalLength is ignored, instead the kernel returns a
724 * config descriptor with verified bLength fields, with descriptors
725 * with an invalid bLength removed.
727 if (sysfs_has_descriptors) {
728 int next = seek_to_next_descriptor(ctx, LIBUSB_DT_CONFIG,
730 if (next == LIBUSB_ERROR_NOT_FOUND)
735 if (next != config.wTotalLength)
736 usbi_warn(ctx, "config length mismatch wTotalLength "
737 "%d real %d", config.wTotalLength, next);
740 if (config.wTotalLength < LIBUSB_DT_CONFIG_SIZE) {
741 usbi_err(ctx, "invalid wTotalLength %d",
742 config.wTotalLength);
743 return LIBUSB_ERROR_IO;
744 } else if (config.wTotalLength > size) {
745 usbi_warn(ctx, "short descriptor read %d/%d",
746 size, config.wTotalLength);
749 return config.wTotalLength;
753 static int op_get_config_descriptor_by_value(struct libusb_device *dev,
754 uint8_t value, unsigned char **buffer, int *host_endian)
756 struct libusb_context *ctx = DEVICE_CTX(dev);
757 struct linux_device_priv *priv = _device_priv(dev);
758 unsigned char *descriptors = priv->descriptors;
759 int size = priv->descriptors_len;
760 struct libusb_config_descriptor *config;
763 /* Unlike the device desc. config descs. are always in raw format */
766 /* Skip device header */
767 descriptors += DEVICE_DESC_LENGTH;
768 size -= DEVICE_DESC_LENGTH;
770 /* Seek till the config is found, or till "EOF" */
772 int next = seek_to_next_config(ctx, descriptors, size);
775 config = (struct libusb_config_descriptor *)descriptors;
776 if (config->bConfigurationValue == value) {
777 *buffer = descriptors;
785 static int op_get_active_config_descriptor(struct libusb_device *dev,
786 unsigned char *buffer, size_t len, int *host_endian)
789 unsigned char *config_desc;
791 if (sysfs_can_relate_devices) {
792 r = sysfs_get_active_config(dev, &config);
796 /* Use cached bConfigurationValue */
797 struct linux_device_priv *priv = _device_priv(dev);
798 config = priv->active_config;
801 return LIBUSB_ERROR_NOT_FOUND;
803 r = op_get_config_descriptor_by_value(dev, config, &config_desc,
809 memcpy(buffer, config_desc, len);
813 static int op_get_config_descriptor(struct libusb_device *dev,
814 uint8_t config_index, unsigned char *buffer, size_t len, int *host_endian)
816 struct linux_device_priv *priv = _device_priv(dev);
817 unsigned char *descriptors = priv->descriptors;
818 int i, r, size = priv->descriptors_len;
820 /* Unlike the device desc. config descs. are always in raw format */
823 /* Skip device header */
824 descriptors += DEVICE_DESC_LENGTH;
825 size -= DEVICE_DESC_LENGTH;
827 /* Seek till the config is found, or till "EOF" */
829 r = seek_to_next_config(DEVICE_CTX(dev), descriptors, size);
832 if (i == config_index)
839 memcpy(buffer, descriptors, len);
843 /* send a control message to retrieve active configuration */
844 static int usbfs_get_active_config(struct libusb_device *dev, int fd)
846 unsigned char active_config = 0;
849 struct usbfs_ctrltransfer ctrl = {
850 .bmRequestType = LIBUSB_ENDPOINT_IN,
851 .bRequest = LIBUSB_REQUEST_GET_CONFIGURATION,
856 .data = &active_config
859 r = ioctl(fd, IOCTL_USBFS_CONTROL, &ctrl);
862 return LIBUSB_ERROR_NO_DEVICE;
864 /* we hit this error path frequently with buggy devices :( */
865 usbi_warn(DEVICE_CTX(dev),
866 "get_configuration failed ret=%d errno=%d", r, errno);
867 return LIBUSB_ERROR_IO;
870 return active_config;
873 static int initialize_device(struct libusb_device *dev, uint8_t busnum,
874 uint8_t devaddr, const char *sysfs_dir)
876 struct linux_device_priv *priv = _device_priv(dev);
877 struct libusb_context *ctx = DEVICE_CTX(dev);
878 int descriptors_size = 512; /* Begin with a 1024 byte alloc */
882 dev->bus_number = busnum;
883 dev->device_address = devaddr;
886 priv->sysfs_dir = strdup(sysfs_dir);
887 if (!priv->sysfs_dir)
888 return LIBUSB_ERROR_NO_MEM;
890 /* Note speed can contain 1.5, in this case __read_sysfs_attr
891 will stop parsing at the '.' and return 1 */
892 speed = __read_sysfs_attr(DEVICE_CTX(dev), sysfs_dir, "speed");
895 case 1: dev->speed = LIBUSB_SPEED_LOW; break;
896 case 12: dev->speed = LIBUSB_SPEED_FULL; break;
897 case 480: dev->speed = LIBUSB_SPEED_HIGH; break;
898 case 5000: dev->speed = LIBUSB_SPEED_SUPER; break;
900 usbi_warn(DEVICE_CTX(dev), "Unknown device speed: %d Mbps", speed);
905 /* cache descriptors in memory */
906 if (sysfs_has_descriptors)
907 fd = _open_sysfs_attr(dev, "descriptors");
909 fd = _get_usbfs_fd(dev, O_RDONLY, 0);
914 descriptors_size *= 2;
915 priv->descriptors = usbi_reallocf(priv->descriptors,
917 if (!priv->descriptors) {
919 return LIBUSB_ERROR_NO_MEM;
921 /* usbfs has holes in the file */
922 if (!sysfs_has_descriptors) {
923 memset(priv->descriptors + priv->descriptors_len,
924 0, descriptors_size - priv->descriptors_len);
926 r = read(fd, priv->descriptors + priv->descriptors_len,
927 descriptors_size - priv->descriptors_len);
929 usbi_err(ctx, "read descriptor failed ret=%d errno=%d",
932 return LIBUSB_ERROR_IO;
934 priv->descriptors_len += r;
935 } while (priv->descriptors_len == descriptors_size);
939 if (priv->descriptors_len < DEVICE_DESC_LENGTH) {
940 usbi_err(ctx, "short descriptor read (%d)",
941 priv->descriptors_len);
942 return LIBUSB_ERROR_IO;
945 if (sysfs_can_relate_devices)
946 return LIBUSB_SUCCESS;
948 /* cache active config */
949 fd = _get_usbfs_fd(dev, O_RDWR, 1);
951 /* cannot send a control message to determine the active
952 * config. just assume the first one is active. */
953 usbi_warn(ctx, "Missing rw usbfs access; cannot determine "
954 "active configuration descriptor");
955 if (priv->descriptors_len >=
956 (DEVICE_DESC_LENGTH + LIBUSB_DT_CONFIG_SIZE)) {
957 struct libusb_config_descriptor config;
958 usbi_parse_descriptor(
959 priv->descriptors + DEVICE_DESC_LENGTH,
960 "bbwbbbbb", &config, 0);
961 priv->active_config = config.bConfigurationValue;
963 priv->active_config = -1; /* No config dt */
965 return LIBUSB_SUCCESS;
968 r = usbfs_get_active_config(dev, fd);
970 priv->active_config = r;
973 /* some buggy devices have a configuration 0, but we're
974 * reaching into the corner of a corner case here, so let's
975 * not support buggy devices in these circumstances.
976 * stick to the specs: a configuration value of 0 means
978 usbi_dbg("active cfg 0? assuming unconfigured device");
979 priv->active_config = -1;
981 } else if (r == LIBUSB_ERROR_IO) {
982 /* buggy devices sometimes fail to report their active config.
983 * assume unconfigured and continue the probing */
984 usbi_warn(ctx, "couldn't query active configuration, assuming"
986 priv->active_config = -1;
988 } /* else r < 0, just return the error code */
994 static int linux_get_parent_info(struct libusb_device *dev, const char *sysfs_dir)
996 struct libusb_context *ctx = DEVICE_CTX(dev);
997 struct libusb_device *it;
998 char *parent_sysfs_dir, *tmp;
999 int ret, add_parent = 1;
1001 /* XXX -- can we figure out the topology when using usbfs? */
1002 if (NULL == sysfs_dir || 0 == strncmp(sysfs_dir, "usb", 3)) {
1003 /* either using usbfs or finding the parent of a root hub */
1004 return LIBUSB_SUCCESS;
1007 parent_sysfs_dir = strdup(sysfs_dir);
1008 if (NULL == parent_sysfs_dir) {
1009 return LIBUSB_ERROR_NO_MEM;
1011 if (NULL != (tmp = strrchr(parent_sysfs_dir, '.')) ||
1012 NULL != (tmp = strrchr(parent_sysfs_dir, '-'))) {
1013 dev->port_number = atoi(tmp + 1);
1016 usbi_warn(ctx, "Can not parse sysfs_dir: %s, no parent info",
1018 free (parent_sysfs_dir);
1019 return LIBUSB_SUCCESS;
1022 /* is the parent a root hub? */
1023 if (NULL == strchr(parent_sysfs_dir, '-')) {
1024 tmp = parent_sysfs_dir;
1025 ret = asprintf (&parent_sysfs_dir, "usb%s", tmp);
1028 return LIBUSB_ERROR_NO_MEM;
1033 /* find the parent in the context */
1034 usbi_mutex_lock(&ctx->usb_devs_lock);
1035 list_for_each_entry(it, &ctx->usb_devs, list, struct libusb_device) {
1036 struct linux_device_priv *priv = _device_priv(it);
1037 if (0 == strcmp (priv->sysfs_dir, parent_sysfs_dir)) {
1038 dev->parent_dev = libusb_ref_device(it);
1042 usbi_mutex_unlock(&ctx->usb_devs_lock);
1044 if (!dev->parent_dev && add_parent) {
1045 usbi_dbg("parent_dev %s not enumerated yet, enumerating now",
1047 sysfs_scan_device(ctx, parent_sysfs_dir);
1052 usbi_dbg("Dev %p (%s) has parent %p (%s) port %d", dev, sysfs_dir,
1053 dev->parent_dev, parent_sysfs_dir, dev->port_number);
1055 free (parent_sysfs_dir);
1057 return LIBUSB_SUCCESS;
1060 int linux_enumerate_device(struct libusb_context *ctx,
1061 uint8_t busnum, uint8_t devaddr, const char *sysfs_dir)
1063 unsigned long session_id;
1064 struct libusb_device *dev;
1067 /* FIXME: session ID is not guaranteed unique as addresses can wrap and
1068 * will be reused. instead we should add a simple sysfs attribute with
1070 session_id = busnum << 8 | devaddr;
1071 usbi_dbg("busnum %d devaddr %d session_id %ld", busnum, devaddr,
1074 dev = usbi_get_device_by_session_id(ctx, session_id);
1076 /* device already exists in the context */
1077 usbi_dbg("session_id %ld already exists", session_id);
1078 libusb_unref_device(dev);
1079 return LIBUSB_SUCCESS;
1082 usbi_dbg("allocating new device for %d/%d (session %ld)",
1083 busnum, devaddr, session_id);
1084 dev = usbi_alloc_device(ctx, session_id);
1086 return LIBUSB_ERROR_NO_MEM;
1088 r = initialize_device(dev, busnum, devaddr, sysfs_dir);
1091 r = usbi_sanitize_device(dev);
1095 r = linux_get_parent_info(dev, sysfs_dir);
1100 libusb_unref_device(dev);
1102 usbi_connect_device(dev);
1107 void linux_hotplug_enumerate(uint8_t busnum, uint8_t devaddr, const char *sys_name)
1109 struct libusb_context *ctx;
1111 usbi_mutex_static_lock(&active_contexts_lock);
1112 list_for_each_entry(ctx, &active_contexts_list, list, struct libusb_context) {
1113 linux_enumerate_device(ctx, busnum, devaddr, sys_name);
1115 usbi_mutex_static_unlock(&active_contexts_lock);
1118 void linux_device_disconnected(uint8_t busnum, uint8_t devaddr)
1120 struct libusb_context *ctx;
1121 struct libusb_device *dev;
1122 unsigned long session_id = busnum << 8 | devaddr;
1124 usbi_mutex_static_lock(&active_contexts_lock);
1125 list_for_each_entry(ctx, &active_contexts_list, list, struct libusb_context) {
1126 dev = usbi_get_device_by_session_id (ctx, session_id);
1128 usbi_disconnect_device (dev);
1129 libusb_unref_device(dev);
1131 usbi_dbg("device not found for session %x", session_id);
1134 usbi_mutex_static_unlock(&active_contexts_lock);
1137 #if !defined(USE_UDEV)
1138 /* open a bus directory and adds all discovered devices to the context */
1139 static int usbfs_scan_busdir(struct libusb_context *ctx, uint8_t busnum)
1142 char dirpath[PATH_MAX];
1143 struct dirent *entry;
1144 int r = LIBUSB_ERROR_IO;
1146 snprintf(dirpath, PATH_MAX, "%s/%03d", usbfs_path, busnum);
1147 usbi_dbg("%s", dirpath);
1148 dir = opendir(dirpath);
1150 usbi_err(ctx, "opendir '%s' failed, errno=%d", dirpath, errno);
1151 /* FIXME: should handle valid race conditions like hub unplugged
1152 * during directory iteration - this is not an error */
1156 while ((entry = readdir(dir))) {
1159 if (entry->d_name[0] == '.')
1162 devaddr = atoi(entry->d_name);
1164 usbi_dbg("unknown dir entry %s", entry->d_name);
1168 if (linux_enumerate_device(ctx, busnum, (uint8_t) devaddr, NULL)) {
1169 usbi_dbg("failed to enumerate dir entry %s", entry->d_name);
1180 static int usbfs_get_device_list(struct libusb_context *ctx)
1182 struct dirent *entry;
1183 DIR *buses = opendir(usbfs_path);
1187 usbi_err(ctx, "opendir buses failed errno=%d", errno);
1188 return LIBUSB_ERROR_IO;
1191 while ((entry = readdir(buses))) {
1194 if (entry->d_name[0] == '.')
1199 if (!_is_usbdev_entry(entry, &busnum, &devaddr))
1202 r = linux_enumerate_device(ctx, busnum, (uint8_t) devaddr, NULL);
1204 usbi_dbg("failed to enumerate dir entry %s", entry->d_name);
1208 busnum = atoi(entry->d_name);
1210 usbi_dbg("unknown dir entry %s", entry->d_name);
1214 r = usbfs_scan_busdir(ctx, busnum);
1226 static int sysfs_scan_device(struct libusb_context *ctx, const char *devname)
1228 uint8_t busnum, devaddr;
1231 ret = linux_get_device_address (ctx, 0, &busnum, &devaddr, NULL, devname);
1232 if (LIBUSB_SUCCESS != ret) {
1236 return linux_enumerate_device(ctx, busnum & 0xff, devaddr & 0xff,
1240 #if !defined(USE_UDEV)
1241 static int sysfs_get_device_list(struct libusb_context *ctx)
1243 DIR *devices = opendir(SYSFS_DEVICE_PATH);
1244 struct dirent *entry;
1245 int r = LIBUSB_ERROR_IO;
1248 usbi_err(ctx, "opendir devices failed errno=%d", errno);
1252 while ((entry = readdir(devices))) {
1253 if ((!isdigit(entry->d_name[0]) && strncmp(entry->d_name, "usb", 3))
1254 || strchr(entry->d_name, ':'))
1257 if (sysfs_scan_device(ctx, entry->d_name)) {
1258 usbi_dbg("failed to enumerate dir entry %s", entry->d_name);
1269 static int linux_default_scan_devices (struct libusb_context *ctx)
1271 /* we can retrieve device list and descriptors from sysfs or usbfs.
1272 * sysfs is preferable, because if we use usbfs we end up resuming
1273 * any autosuspended USB devices. however, sysfs is not available
1274 * everywhere, so we need a usbfs fallback too.
1276 * as described in the "sysfs vs usbfs" comment at the top of this
1277 * file, sometimes we have sysfs but not enough information to
1278 * relate sysfs devices to usbfs nodes. op_init() determines the
1279 * adequacy of sysfs and sets sysfs_can_relate_devices.
1281 if (sysfs_can_relate_devices != 0)
1282 return sysfs_get_device_list(ctx);
1284 return usbfs_get_device_list(ctx);
1288 static int op_open(struct libusb_device_handle *handle)
1290 struct linux_device_handle_priv *hpriv = _device_handle_priv(handle);
1293 hpriv->fd = _get_usbfs_fd(handle->dev, O_RDWR, 0);
1294 if (hpriv->fd < 0) {
1295 if (hpriv->fd == LIBUSB_ERROR_NO_DEVICE) {
1296 /* device will still be marked as attached if hotplug monitor thread
1297 * hasn't processed remove event yet */
1298 usbi_mutex_static_lock(&linux_hotplug_lock);
1299 if (handle->dev->attached) {
1300 usbi_dbg("open failed with no device, but device still attached");
1301 linux_device_disconnected(handle->dev->bus_number,
1302 handle->dev->device_address);
1304 usbi_mutex_static_unlock(&linux_hotplug_lock);
1309 r = ioctl(hpriv->fd, IOCTL_USBFS_GET_CAPABILITIES, &hpriv->caps);
1311 if (errno == ENOTTY)
1312 usbi_dbg("getcap not available");
1314 usbi_err(HANDLE_CTX(handle), "getcap failed (%d)", errno);
1316 if (supports_flag_zero_packet)
1317 hpriv->caps |= USBFS_CAP_ZERO_PACKET;
1318 if (supports_flag_bulk_continuation)
1319 hpriv->caps |= USBFS_CAP_BULK_CONTINUATION;
1322 r = usbi_add_pollfd(HANDLE_CTX(handle), hpriv->fd, POLLOUT);
1329 static void op_close(struct libusb_device_handle *dev_handle)
1331 struct linux_device_handle_priv *hpriv = _device_handle_priv(dev_handle);
1332 /* fd may have already been removed by POLLERR condition in op_handle_events() */
1333 if (!hpriv->fd_removed)
1334 usbi_remove_pollfd(HANDLE_CTX(dev_handle), hpriv->fd);
1338 static int op_get_configuration(struct libusb_device_handle *handle,
1343 if (sysfs_can_relate_devices) {
1344 r = sysfs_get_active_config(handle->dev, config);
1346 r = usbfs_get_active_config(handle->dev,
1347 _device_handle_priv(handle)->fd);
1352 if (*config == -1) {
1353 usbi_err(HANDLE_CTX(handle), "device unconfigured");
1360 static int op_set_configuration(struct libusb_device_handle *handle, int config)
1362 struct linux_device_priv *priv = _device_priv(handle->dev);
1363 int fd = _device_handle_priv(handle)->fd;
1364 int r = ioctl(fd, IOCTL_USBFS_SETCONFIG, &config);
1366 if (errno == EINVAL)
1367 return LIBUSB_ERROR_NOT_FOUND;
1368 else if (errno == EBUSY)
1369 return LIBUSB_ERROR_BUSY;
1370 else if (errno == ENODEV)
1371 return LIBUSB_ERROR_NO_DEVICE;
1373 usbi_err(HANDLE_CTX(handle), "failed, error %d errno %d", r, errno);
1374 return LIBUSB_ERROR_OTHER;
1377 /* update our cached active config descriptor */
1378 priv->active_config = config;
1380 return LIBUSB_SUCCESS;
1383 static int claim_interface(struct libusb_device_handle *handle, int iface)
1385 int fd = _device_handle_priv(handle)->fd;
1386 int r = ioctl(fd, IOCTL_USBFS_CLAIMINTF, &iface);
1388 if (errno == ENOENT)
1389 return LIBUSB_ERROR_NOT_FOUND;
1390 else if (errno == EBUSY)
1391 return LIBUSB_ERROR_BUSY;
1392 else if (errno == ENODEV)
1393 return LIBUSB_ERROR_NO_DEVICE;
1395 usbi_err(HANDLE_CTX(handle),
1396 "claim interface failed, error %d errno %d", r, errno);
1397 return LIBUSB_ERROR_OTHER;
1402 static int release_interface(struct libusb_device_handle *handle, int iface)
1404 int fd = _device_handle_priv(handle)->fd;
1405 int r = ioctl(fd, IOCTL_USBFS_RELEASEINTF, &iface);
1407 if (errno == ENODEV)
1408 return LIBUSB_ERROR_NO_DEVICE;
1410 usbi_err(HANDLE_CTX(handle),
1411 "release interface failed, error %d errno %d", r, errno);
1412 return LIBUSB_ERROR_OTHER;
1417 static int op_set_interface(struct libusb_device_handle *handle, int iface,
1420 int fd = _device_handle_priv(handle)->fd;
1421 struct usbfs_setinterface setintf;
1424 setintf.interface = iface;
1425 setintf.altsetting = altsetting;
1426 r = ioctl(fd, IOCTL_USBFS_SETINTF, &setintf);
1428 if (errno == EINVAL)
1429 return LIBUSB_ERROR_NOT_FOUND;
1430 else if (errno == ENODEV)
1431 return LIBUSB_ERROR_NO_DEVICE;
1433 usbi_err(HANDLE_CTX(handle),
1434 "setintf failed error %d errno %d", r, errno);
1435 return LIBUSB_ERROR_OTHER;
1441 static int op_clear_halt(struct libusb_device_handle *handle,
1442 unsigned char endpoint)
1444 int fd = _device_handle_priv(handle)->fd;
1445 unsigned int _endpoint = endpoint;
1446 int r = ioctl(fd, IOCTL_USBFS_CLEAR_HALT, &_endpoint);
1448 if (errno == ENOENT)
1449 return LIBUSB_ERROR_NOT_FOUND;
1450 else if (errno == ENODEV)
1451 return LIBUSB_ERROR_NO_DEVICE;
1453 usbi_err(HANDLE_CTX(handle),
1454 "clear_halt failed error %d errno %d", r, errno);
1455 return LIBUSB_ERROR_OTHER;
1461 static int op_reset_device(struct libusb_device_handle *handle)
1463 int fd = _device_handle_priv(handle)->fd;
1466 /* Doing a device reset will cause the usbfs driver to get unbound
1467 from any interfaces it is bound to. By voluntarily unbinding
1468 the usbfs driver ourself, we stop the kernel from rebinding
1469 the interface after reset (which would end up with the interface
1470 getting bound to the in kernel driver if any). */
1471 for (i = 0; i < USB_MAXINTERFACES; i++) {
1472 if (handle->claimed_interfaces & (1L << i)) {
1473 release_interface(handle, i);
1477 usbi_mutex_lock(&handle->lock);
1478 r = ioctl(fd, IOCTL_USBFS_RESET, NULL);
1480 if (errno == ENODEV) {
1481 ret = LIBUSB_ERROR_NOT_FOUND;
1485 usbi_err(HANDLE_CTX(handle),
1486 "reset failed error %d errno %d", r, errno);
1487 ret = LIBUSB_ERROR_OTHER;
1491 /* And re-claim any interfaces which were claimed before the reset */
1492 for (i = 0; i < USB_MAXINTERFACES; i++) {
1493 if (handle->claimed_interfaces & (1L << i)) {
1495 * A driver may have completed modprobing during
1496 * IOCTL_USBFS_RESET, and bound itself as soon as
1497 * IOCTL_USBFS_RESET released the device lock
1499 r = detach_kernel_driver_and_claim(handle, i);
1501 usbi_warn(HANDLE_CTX(handle),
1502 "failed to re-claim interface %d after reset: %s",
1503 i, libusb_error_name(r));
1504 handle->claimed_interfaces &= ~(1L << i);
1505 ret = LIBUSB_ERROR_NOT_FOUND;
1510 usbi_mutex_unlock(&handle->lock);
1514 static int do_streams_ioctl(struct libusb_device_handle *handle, long req,
1515 uint32_t num_streams, unsigned char *endpoints, int num_endpoints)
1517 int r, fd = _device_handle_priv(handle)->fd;
1518 struct usbfs_streams *streams;
1520 if (num_endpoints > 30) /* Max 15 in + 15 out eps */
1521 return LIBUSB_ERROR_INVALID_PARAM;
1523 streams = malloc(sizeof(struct usbfs_streams) + num_endpoints);
1525 return LIBUSB_ERROR_NO_MEM;
1527 streams->num_streams = num_streams;
1528 streams->num_eps = num_endpoints;
1529 memcpy(streams->eps, endpoints, num_endpoints);
1531 r = ioctl(fd, req, streams);
1536 if (errno == ENOTTY)
1537 return LIBUSB_ERROR_NOT_SUPPORTED;
1538 else if (errno == EINVAL)
1539 return LIBUSB_ERROR_INVALID_PARAM;
1540 else if (errno == ENODEV)
1541 return LIBUSB_ERROR_NO_DEVICE;
1543 usbi_err(HANDLE_CTX(handle),
1544 "streams-ioctl failed error %d errno %d", r, errno);
1545 return LIBUSB_ERROR_OTHER;
1550 static int op_alloc_streams(struct libusb_device_handle *handle,
1551 uint32_t num_streams, unsigned char *endpoints, int num_endpoints)
1553 return do_streams_ioctl(handle, IOCTL_USBFS_ALLOC_STREAMS,
1554 num_streams, endpoints, num_endpoints);
1557 static int op_free_streams(struct libusb_device_handle *handle,
1558 unsigned char *endpoints, int num_endpoints)
1560 return do_streams_ioctl(handle, IOCTL_USBFS_FREE_STREAMS, 0,
1561 endpoints, num_endpoints);
1564 static int op_kernel_driver_active(struct libusb_device_handle *handle,
1567 int fd = _device_handle_priv(handle)->fd;
1568 struct usbfs_getdriver getdrv;
1571 getdrv.interface = interface;
1572 r = ioctl(fd, IOCTL_USBFS_GETDRIVER, &getdrv);
1574 if (errno == ENODATA)
1576 else if (errno == ENODEV)
1577 return LIBUSB_ERROR_NO_DEVICE;
1579 usbi_err(HANDLE_CTX(handle),
1580 "get driver failed error %d errno %d", r, errno);
1581 return LIBUSB_ERROR_OTHER;
1584 return (strcmp(getdrv.driver, "usbfs") == 0) ? 0 : 1;
1587 static int op_detach_kernel_driver(struct libusb_device_handle *handle,
1590 int fd = _device_handle_priv(handle)->fd;
1591 struct usbfs_ioctl command;
1592 struct usbfs_getdriver getdrv;
1595 command.ifno = interface;
1596 command.ioctl_code = IOCTL_USBFS_DISCONNECT;
1597 command.data = NULL;
1599 getdrv.interface = interface;
1600 r = ioctl(fd, IOCTL_USBFS_GETDRIVER, &getdrv);
1601 if (r == 0 && strcmp(getdrv.driver, "usbfs") == 0)
1602 return LIBUSB_ERROR_NOT_FOUND;
1604 r = ioctl(fd, IOCTL_USBFS_IOCTL, &command);
1606 if (errno == ENODATA)
1607 return LIBUSB_ERROR_NOT_FOUND;
1608 else if (errno == EINVAL)
1609 return LIBUSB_ERROR_INVALID_PARAM;
1610 else if (errno == ENODEV)
1611 return LIBUSB_ERROR_NO_DEVICE;
1613 usbi_err(HANDLE_CTX(handle),
1614 "detach failed error %d errno %d", r, errno);
1615 return LIBUSB_ERROR_OTHER;
1621 static int op_attach_kernel_driver(struct libusb_device_handle *handle,
1624 int fd = _device_handle_priv(handle)->fd;
1625 struct usbfs_ioctl command;
1628 command.ifno = interface;
1629 command.ioctl_code = IOCTL_USBFS_CONNECT;
1630 command.data = NULL;
1632 r = ioctl(fd, IOCTL_USBFS_IOCTL, &command);
1634 if (errno == ENODATA)
1635 return LIBUSB_ERROR_NOT_FOUND;
1636 else if (errno == EINVAL)
1637 return LIBUSB_ERROR_INVALID_PARAM;
1638 else if (errno == ENODEV)
1639 return LIBUSB_ERROR_NO_DEVICE;
1640 else if (errno == EBUSY)
1641 return LIBUSB_ERROR_BUSY;
1643 usbi_err(HANDLE_CTX(handle),
1644 "attach failed error %d errno %d", r, errno);
1645 return LIBUSB_ERROR_OTHER;
1646 } else if (r == 0) {
1647 return LIBUSB_ERROR_NOT_FOUND;
1653 static int detach_kernel_driver_and_claim(struct libusb_device_handle *handle,
1656 struct usbfs_disconnect_claim dc;
1657 int r, fd = _device_handle_priv(handle)->fd;
1659 dc.interface = interface;
1660 strcpy(dc.driver, "usbfs");
1661 dc.flags = USBFS_DISCONNECT_CLAIM_EXCEPT_DRIVER;
1662 r = ioctl(fd, IOCTL_USBFS_DISCONNECT_CLAIM, &dc);
1663 if (r == 0 || (r != 0 && errno != ENOTTY)) {
1669 return LIBUSB_ERROR_BUSY;
1671 return LIBUSB_ERROR_INVALID_PARAM;
1673 return LIBUSB_ERROR_NO_DEVICE;
1675 usbi_err(HANDLE_CTX(handle),
1676 "disconnect-and-claim failed errno %d", errno);
1677 return LIBUSB_ERROR_OTHER;
1680 /* Fallback code for kernels which don't support the
1681 disconnect-and-claim ioctl */
1682 r = op_detach_kernel_driver(handle, interface);
1683 if (r != 0 && r != LIBUSB_ERROR_NOT_FOUND)
1686 return claim_interface(handle, interface);
1689 static int op_claim_interface(struct libusb_device_handle *handle, int iface)
1691 if (handle->auto_detach_kernel_driver)
1692 return detach_kernel_driver_and_claim(handle, iface);
1694 return claim_interface(handle, iface);
1697 static int op_release_interface(struct libusb_device_handle *handle, int iface)
1701 r = release_interface(handle, iface);
1705 if (handle->auto_detach_kernel_driver)
1706 op_attach_kernel_driver(handle, iface);
1711 static void op_destroy_device(struct libusb_device *dev)
1713 struct linux_device_priv *priv = _device_priv(dev);
1714 if (priv->descriptors)
1715 free(priv->descriptors);
1716 if (priv->sysfs_dir)
1717 free(priv->sysfs_dir);
1720 /* URBs are discarded in reverse order of submission to avoid races. */
1721 static int discard_urbs(struct usbi_transfer *itransfer, int first, int last_plus_one)
1723 struct libusb_transfer *transfer =
1724 USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
1725 struct linux_transfer_priv *tpriv =
1726 usbi_transfer_get_os_priv(itransfer);
1727 struct linux_device_handle_priv *dpriv =
1728 _device_handle_priv(transfer->dev_handle);
1730 struct usbfs_urb *urb;
1732 for (i = last_plus_one - 1; i >= first; i--) {
1733 if (LIBUSB_TRANSFER_TYPE_ISOCHRONOUS == transfer->type)
1734 urb = tpriv->iso_urbs[i];
1736 urb = &tpriv->urbs[i];
1738 if (0 == ioctl(dpriv->fd, IOCTL_USBFS_DISCARDURB, urb))
1741 if (EINVAL == errno) {
1742 usbi_dbg("URB not found --> assuming ready to be reaped");
1743 if (i == (last_plus_one - 1))
1744 ret = LIBUSB_ERROR_NOT_FOUND;
1745 } else if (ENODEV == errno) {
1746 usbi_dbg("Device not found for URB --> assuming ready to be reaped");
1747 ret = LIBUSB_ERROR_NO_DEVICE;
1749 usbi_warn(TRANSFER_CTX(transfer),
1750 "unrecognised discard errno %d", errno);
1751 ret = LIBUSB_ERROR_OTHER;
1757 static void free_iso_urbs(struct linux_transfer_priv *tpriv)
1760 for (i = 0; i < tpriv->num_urbs; i++) {
1761 struct usbfs_urb *urb = tpriv->iso_urbs[i];
1767 free(tpriv->iso_urbs);
1768 tpriv->iso_urbs = NULL;
1771 static int submit_bulk_transfer(struct usbi_transfer *itransfer)
1773 struct libusb_transfer *transfer =
1774 USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
1775 struct linux_transfer_priv *tpriv = usbi_transfer_get_os_priv(itransfer);
1776 struct linux_device_handle_priv *dpriv =
1777 _device_handle_priv(transfer->dev_handle);
1778 struct usbfs_urb *urbs;
1779 int is_out = (transfer->endpoint & LIBUSB_ENDPOINT_DIR_MASK)
1780 == LIBUSB_ENDPOINT_OUT;
1781 int bulk_buffer_len, use_bulk_continuation;
1785 if (is_out && (transfer->flags & LIBUSB_TRANSFER_ADD_ZERO_PACKET) &&
1786 !(dpriv->caps & USBFS_CAP_ZERO_PACKET))
1787 return LIBUSB_ERROR_NOT_SUPPORTED;
1790 * Older versions of usbfs place a 16kb limit on bulk URBs. We work
1791 * around this by splitting large transfers into 16k blocks, and then
1792 * submit all urbs at once. it would be simpler to submit one urb at
1793 * a time, but there is a big performance gain doing it this way.
1795 * Newer versions lift the 16k limit (USBFS_CAP_NO_PACKET_SIZE_LIM),
1796 * using arbritary large transfers can still be a bad idea though, as
1797 * the kernel needs to allocate physical contiguous memory for this,
1798 * which may fail for large buffers.
1800 * The kernel solves this problem by splitting the transfer into
1801 * blocks itself when the host-controller is scatter-gather capable
1802 * (USBFS_CAP_BULK_SCATTER_GATHER), which most controllers are.
1804 * Last, there is the issue of short-transfers when splitting, for
1805 * short split-transfers to work reliable USBFS_CAP_BULK_CONTINUATION
1806 * is needed, but this is not always available.
1808 if (dpriv->caps & USBFS_CAP_BULK_SCATTER_GATHER) {
1809 /* Good! Just submit everything in one go */
1810 bulk_buffer_len = transfer->length ? transfer->length : 1;
1811 use_bulk_continuation = 0;
1812 } else if (dpriv->caps & USBFS_CAP_BULK_CONTINUATION) {
1813 /* Split the transfers and use bulk-continuation to
1814 avoid issues with short-transfers */
1815 bulk_buffer_len = MAX_BULK_BUFFER_LENGTH;
1816 use_bulk_continuation = 1;
1817 } else if (dpriv->caps & USBFS_CAP_NO_PACKET_SIZE_LIM) {
1818 /* Don't split, assume the kernel can alloc the buffer
1819 (otherwise the submit will fail with -ENOMEM) */
1820 bulk_buffer_len = transfer->length ? transfer->length : 1;
1821 use_bulk_continuation = 0;
1823 /* Bad, splitting without bulk-continuation, short transfers
1824 which end before the last urb will not work reliable! */
1825 /* Note we don't warn here as this is "normal" on kernels <
1826 2.6.32 and not a problem for most applications */
1827 bulk_buffer_len = MAX_BULK_BUFFER_LENGTH;
1828 use_bulk_continuation = 0;
1831 int num_urbs = transfer->length / bulk_buffer_len;
1832 int last_urb_partial = 0;
1834 if (transfer->length == 0) {
1836 } else if ((transfer->length % bulk_buffer_len) > 0) {
1837 last_urb_partial = 1;
1840 usbi_dbg("need %d urbs for new transfer with length %d", num_urbs,
1842 urbs = calloc(num_urbs, sizeof(struct usbfs_urb));
1844 return LIBUSB_ERROR_NO_MEM;
1846 tpriv->num_urbs = num_urbs;
1847 tpriv->num_retired = 0;
1848 tpriv->reap_action = NORMAL;
1849 tpriv->reap_status = LIBUSB_TRANSFER_COMPLETED;
1851 for (i = 0; i < num_urbs; i++) {
1852 struct usbfs_urb *urb = &urbs[i];
1853 urb->usercontext = itransfer;
1854 switch (transfer->type) {
1855 case LIBUSB_TRANSFER_TYPE_BULK:
1856 urb->type = USBFS_URB_TYPE_BULK;
1859 case LIBUSB_TRANSFER_TYPE_BULK_STREAM:
1860 urb->type = USBFS_URB_TYPE_BULK;
1861 urb->stream_id = itransfer->stream_id;
1863 case LIBUSB_TRANSFER_TYPE_INTERRUPT:
1864 urb->type = USBFS_URB_TYPE_INTERRUPT;
1867 urb->endpoint = transfer->endpoint;
1868 urb->buffer = transfer->buffer + (i * bulk_buffer_len);
1869 /* don't set the short not ok flag for the last URB */
1870 if (use_bulk_continuation && !is_out && (i < num_urbs - 1))
1871 urb->flags = USBFS_URB_SHORT_NOT_OK;
1872 if (i == num_urbs - 1 && last_urb_partial)
1873 urb->buffer_length = transfer->length % bulk_buffer_len;
1874 else if (transfer->length == 0)
1875 urb->buffer_length = 0;
1877 urb->buffer_length = bulk_buffer_len;
1879 if (i > 0 && use_bulk_continuation)
1880 urb->flags |= USBFS_URB_BULK_CONTINUATION;
1882 /* we have already checked that the flag is supported */
1883 if (is_out && i == num_urbs - 1 &&
1884 transfer->flags & LIBUSB_TRANSFER_ADD_ZERO_PACKET)
1885 urb->flags |= USBFS_URB_ZERO_PACKET;
1887 r = ioctl(dpriv->fd, IOCTL_USBFS_SUBMITURB, urb);
1889 if (errno == ENODEV) {
1890 r = LIBUSB_ERROR_NO_DEVICE;
1892 usbi_err(TRANSFER_CTX(transfer),
1893 "submiturb failed error %d errno=%d", r, errno);
1894 r = LIBUSB_ERROR_IO;
1897 /* if the first URB submission fails, we can simply free up and
1898 * return failure immediately. */
1900 usbi_dbg("first URB failed, easy peasy");
1906 /* if it's not the first URB that failed, the situation is a bit
1907 * tricky. we may need to discard all previous URBs. there are
1909 * - discarding is asynchronous - discarded urbs will be reaped
1910 * later. the user must not have freed the transfer when the
1911 * discarded URBs are reaped, otherwise libusb will be using
1913 * - the earlier URBs may have completed successfully and we do
1914 * not want to throw away any data.
1915 * - this URB failing may be no error; EREMOTEIO means that
1916 * this transfer simply didn't need all the URBs we submitted
1917 * so, we report that the transfer was submitted successfully and
1918 * in case of error we discard all previous URBs. later when
1919 * the final reap completes we can report error to the user,
1920 * or success if an earlier URB was completed successfully.
1922 tpriv->reap_action = EREMOTEIO == errno ? COMPLETED_EARLY : SUBMIT_FAILED;
1924 /* The URBs we haven't submitted yet we count as already
1926 tpriv->num_retired += num_urbs - i;
1928 /* If we completed short then don't try to discard. */
1929 if (COMPLETED_EARLY == tpriv->reap_action)
1932 discard_urbs(itransfer, 0, i);
1934 usbi_dbg("reporting successful submission but waiting for %d "
1935 "discards before reporting error", i);
1943 static int submit_iso_transfer(struct usbi_transfer *itransfer)
1945 struct libusb_transfer *transfer =
1946 USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
1947 struct linux_transfer_priv *tpriv = usbi_transfer_get_os_priv(itransfer);
1948 struct linux_device_handle_priv *dpriv =
1949 _device_handle_priv(transfer->dev_handle);
1950 struct usbfs_urb **urbs;
1952 int num_packets = transfer->num_iso_packets;
1954 int this_urb_len = 0;
1956 int packet_offset = 0;
1957 unsigned int packet_len;
1958 unsigned char *urb_buffer = transfer->buffer;
1960 /* usbfs places arbitrary limits on iso URBs. this limit has changed
1961 * at least three times, and it's difficult to accurately detect which
1962 * limit this running kernel might impose. so we attempt to submit
1963 * whatever the user has provided. if the kernel rejects the request
1964 * due to its size, we return an error indicating such to the user.
1967 /* calculate how many URBs we need */
1968 for (i = 0; i < num_packets; i++) {
1969 unsigned int space_remaining = MAX_ISO_BUFFER_LENGTH - this_urb_len;
1970 packet_len = transfer->iso_packet_desc[i].length;
1972 if (packet_len > space_remaining) {
1974 this_urb_len = packet_len;
1975 /* check that we can actually support this packet length */
1976 if (this_urb_len > MAX_ISO_BUFFER_LENGTH)
1977 return LIBUSB_ERROR_INVALID_PARAM;
1979 this_urb_len += packet_len;
1982 usbi_dbg("need %d %dk URBs for transfer", num_urbs, MAX_ISO_BUFFER_LENGTH / 1024);
1984 urbs = calloc(num_urbs, sizeof(*urbs));
1986 return LIBUSB_ERROR_NO_MEM;
1988 tpriv->iso_urbs = urbs;
1989 tpriv->num_urbs = num_urbs;
1990 tpriv->num_retired = 0;
1991 tpriv->reap_action = NORMAL;
1992 tpriv->iso_packet_offset = 0;
1994 /* allocate + initialize each URB with the correct number of packets */
1995 for (i = 0; i < num_urbs; i++) {
1996 struct usbfs_urb *urb;
1997 unsigned int space_remaining_in_urb = MAX_ISO_BUFFER_LENGTH;
1998 int urb_packet_offset = 0;
1999 unsigned char *urb_buffer_orig = urb_buffer;
2003 /* swallow up all the packets we can fit into this URB */
2004 while (packet_offset < transfer->num_iso_packets) {
2005 packet_len = transfer->iso_packet_desc[packet_offset].length;
2006 if (packet_len <= space_remaining_in_urb) {
2008 urb_packet_offset++;
2010 space_remaining_in_urb -= packet_len;
2011 urb_buffer += packet_len;
2013 /* it can't fit, save it for the next URB */
2018 alloc_size = sizeof(*urb)
2019 + (urb_packet_offset * sizeof(struct usbfs_iso_packet_desc));
2020 urb = calloc(1, alloc_size);
2022 free_iso_urbs(tpriv);
2023 return LIBUSB_ERROR_NO_MEM;
2027 /* populate packet lengths */
2028 for (j = 0, k = packet_offset - urb_packet_offset;
2029 k < packet_offset; k++, j++) {
2030 packet_len = transfer->iso_packet_desc[k].length;
2031 urb->iso_frame_desc[j].length = packet_len;
2034 urb->usercontext = itransfer;
2035 urb->type = USBFS_URB_TYPE_ISO;
2036 /* FIXME: interface for non-ASAP data? */
2037 urb->flags = USBFS_URB_ISO_ASAP;
2038 urb->endpoint = transfer->endpoint;
2039 urb->number_of_packets = urb_packet_offset;
2040 urb->buffer = urb_buffer_orig;
2044 for (i = 0; i < num_urbs; i++) {
2045 int r = ioctl(dpriv->fd, IOCTL_USBFS_SUBMITURB, urbs[i]);
2047 if (errno == ENODEV) {
2048 r = LIBUSB_ERROR_NO_DEVICE;
2049 } else if (errno == EINVAL) {
2050 usbi_warn(TRANSFER_CTX(transfer),
2051 "submiturb failed, transfer too large");
2052 r = LIBUSB_ERROR_INVALID_PARAM;
2054 usbi_err(TRANSFER_CTX(transfer),
2055 "submiturb failed error %d errno=%d", r, errno);
2056 r = LIBUSB_ERROR_IO;
2059 /* if the first URB submission fails, we can simply free up and
2060 * return failure immediately. */
2062 usbi_dbg("first URB failed, easy peasy");
2063 free_iso_urbs(tpriv);
2067 /* if it's not the first URB that failed, the situation is a bit
2068 * tricky. we must discard all previous URBs. there are
2070 * - discarding is asynchronous - discarded urbs will be reaped
2071 * later. the user must not have freed the transfer when the
2072 * discarded URBs are reaped, otherwise libusb will be using
2074 * - the earlier URBs may have completed successfully and we do
2075 * not want to throw away any data.
2076 * so, in this case we discard all the previous URBs BUT we report
2077 * that the transfer was submitted successfully. then later when
2078 * the final discard completes we can report error to the user.
2080 tpriv->reap_action = SUBMIT_FAILED;
2082 /* The URBs we haven't submitted yet we count as already
2084 tpriv->num_retired = num_urbs - i;
2085 discard_urbs(itransfer, 0, i);
2087 usbi_dbg("reporting successful submission but waiting for %d "
2088 "discards before reporting error", i);
2096 static int submit_control_transfer(struct usbi_transfer *itransfer)
2098 struct linux_transfer_priv *tpriv = usbi_transfer_get_os_priv(itransfer);
2099 struct libusb_transfer *transfer =
2100 USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
2101 struct linux_device_handle_priv *dpriv =
2102 _device_handle_priv(transfer->dev_handle);
2103 struct usbfs_urb *urb;
2106 if (transfer->length - LIBUSB_CONTROL_SETUP_SIZE > MAX_CTRL_BUFFER_LENGTH)
2107 return LIBUSB_ERROR_INVALID_PARAM;
2109 urb = calloc(1, sizeof(struct usbfs_urb));
2111 return LIBUSB_ERROR_NO_MEM;
2113 tpriv->num_urbs = 1;
2114 tpriv->reap_action = NORMAL;
2116 urb->usercontext = itransfer;
2117 urb->type = USBFS_URB_TYPE_CONTROL;
2118 urb->endpoint = transfer->endpoint;
2119 urb->buffer = transfer->buffer;
2120 urb->buffer_length = transfer->length;
2122 r = ioctl(dpriv->fd, IOCTL_USBFS_SUBMITURB, urb);
2126 if (errno == ENODEV)
2127 return LIBUSB_ERROR_NO_DEVICE;
2129 usbi_err(TRANSFER_CTX(transfer),
2130 "submiturb failed error %d errno=%d", r, errno);
2131 return LIBUSB_ERROR_IO;
2136 static int op_submit_transfer(struct usbi_transfer *itransfer)
2138 struct libusb_transfer *transfer =
2139 USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
2141 switch (transfer->type) {
2142 case LIBUSB_TRANSFER_TYPE_CONTROL:
2143 return submit_control_transfer(itransfer);
2144 case LIBUSB_TRANSFER_TYPE_BULK:
2145 case LIBUSB_TRANSFER_TYPE_BULK_STREAM:
2146 return submit_bulk_transfer(itransfer);
2147 case LIBUSB_TRANSFER_TYPE_INTERRUPT:
2148 return submit_bulk_transfer(itransfer);
2149 case LIBUSB_TRANSFER_TYPE_ISOCHRONOUS:
2150 return submit_iso_transfer(itransfer);
2152 usbi_err(TRANSFER_CTX(transfer),
2153 "unknown endpoint type %d", transfer->type);
2154 return LIBUSB_ERROR_INVALID_PARAM;
2158 static int op_cancel_transfer(struct usbi_transfer *itransfer)
2160 struct linux_transfer_priv *tpriv = usbi_transfer_get_os_priv(itransfer);
2161 struct libusb_transfer *transfer =
2162 USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
2166 return LIBUSB_ERROR_NOT_FOUND;
2168 r = discard_urbs(itransfer, 0, tpriv->num_urbs);
2172 switch (transfer->type) {
2173 case LIBUSB_TRANSFER_TYPE_BULK:
2174 case LIBUSB_TRANSFER_TYPE_BULK_STREAM:
2175 if (tpriv->reap_action == ERROR)
2177 /* else, fall through */
2179 tpriv->reap_action = CANCELLED;
2185 static void op_clear_transfer_priv(struct usbi_transfer *itransfer)
2187 struct libusb_transfer *transfer =
2188 USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
2189 struct linux_transfer_priv *tpriv = usbi_transfer_get_os_priv(itransfer);
2191 /* urbs can be freed also in submit_transfer so lock mutex first */
2192 switch (transfer->type) {
2193 case LIBUSB_TRANSFER_TYPE_CONTROL:
2194 case LIBUSB_TRANSFER_TYPE_BULK:
2195 case LIBUSB_TRANSFER_TYPE_BULK_STREAM:
2196 case LIBUSB_TRANSFER_TYPE_INTERRUPT:
2202 case LIBUSB_TRANSFER_TYPE_ISOCHRONOUS:
2203 if (tpriv->iso_urbs) {
2204 free_iso_urbs(tpriv);
2205 tpriv->iso_urbs = NULL;
2209 usbi_err(TRANSFER_CTX(transfer),
2210 "unknown endpoint type %d", transfer->type);
2214 static int handle_bulk_completion(struct usbi_transfer *itransfer,
2215 struct usbfs_urb *urb)
2217 struct linux_transfer_priv *tpriv = usbi_transfer_get_os_priv(itransfer);
2218 struct libusb_transfer *transfer = USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
2219 int urb_idx = urb - tpriv->urbs;
2221 usbi_mutex_lock(&itransfer->lock);
2222 usbi_dbg("handling completion status %d of bulk urb %d/%d", urb->status,
2223 urb_idx + 1, tpriv->num_urbs);
2225 tpriv->num_retired++;
2227 if (tpriv->reap_action != NORMAL) {
2228 /* cancelled, submit_fail, or completed early */
2229 usbi_dbg("abnormal reap: urb status %d", urb->status);
2231 /* even though we're in the process of cancelling, it's possible that
2232 * we may receive some data in these URBs that we don't want to lose.
2234 * 1. while the kernel is cancelling all the packets that make up an
2235 * URB, a few of them might complete. so we get back a successful
2236 * cancellation *and* some data.
2237 * 2. we receive a short URB which marks the early completion condition,
2238 * so we start cancelling the remaining URBs. however, we're too
2239 * slow and another URB completes (or at least completes partially).
2240 * (this can't happen since we always use BULK_CONTINUATION.)
2242 * When this happens, our objectives are not to lose any "surplus" data,
2243 * and also to stick it at the end of the previously-received data
2244 * (closing any holes), so that libusb reports the total amount of
2245 * transferred data and presents it in a contiguous chunk.
2247 if (urb->actual_length > 0) {
2248 unsigned char *target = transfer->buffer + itransfer->transferred;
2249 usbi_dbg("received %d bytes of surplus data", urb->actual_length);
2250 if (urb->buffer != target) {
2251 usbi_dbg("moving surplus data from offset %d to offset %d",
2252 (unsigned char *) urb->buffer - transfer->buffer,
2253 target - transfer->buffer);
2254 memmove(target, urb->buffer, urb->actual_length);
2256 itransfer->transferred += urb->actual_length;
2259 if (tpriv->num_retired == tpriv->num_urbs) {
2260 usbi_dbg("abnormal reap: last URB handled, reporting");
2261 if (tpriv->reap_action != COMPLETED_EARLY &&
2262 tpriv->reap_status == LIBUSB_TRANSFER_COMPLETED)
2263 tpriv->reap_status = LIBUSB_TRANSFER_ERROR;
2269 itransfer->transferred += urb->actual_length;
2271 /* Many of these errors can occur on *any* urb of a multi-urb
2272 * transfer. When they do, we tear down the rest of the transfer.
2274 switch (urb->status) {
2277 case -EREMOTEIO: /* short transfer */
2279 case -ENOENT: /* cancelled */
2284 usbi_dbg("device removed");
2285 tpriv->reap_status = LIBUSB_TRANSFER_NO_DEVICE;
2286 goto cancel_remaining;
2288 usbi_dbg("detected endpoint stall");
2289 if (tpriv->reap_status == LIBUSB_TRANSFER_COMPLETED)
2290 tpriv->reap_status = LIBUSB_TRANSFER_STALL;
2291 goto cancel_remaining;
2293 /* overflow can only ever occur in the last urb */
2294 usbi_dbg("overflow, actual_length=%d", urb->actual_length);
2295 if (tpriv->reap_status == LIBUSB_TRANSFER_COMPLETED)
2296 tpriv->reap_status = LIBUSB_TRANSFER_OVERFLOW;
2303 usbi_dbg("low level error %d", urb->status);
2304 tpriv->reap_action = ERROR;
2305 goto cancel_remaining;
2307 usbi_warn(ITRANSFER_CTX(itransfer),
2308 "unrecognised urb status %d", urb->status);
2309 tpriv->reap_action = ERROR;
2310 goto cancel_remaining;
2313 /* if we're the last urb or we got less data than requested then we're
2315 if (urb_idx == tpriv->num_urbs - 1) {
2316 usbi_dbg("last URB in transfer --> complete!");
2318 } else if (urb->actual_length < urb->buffer_length) {
2319 usbi_dbg("short transfer %d/%d --> complete!",
2320 urb->actual_length, urb->buffer_length);
2321 if (tpriv->reap_action == NORMAL)
2322 tpriv->reap_action = COMPLETED_EARLY;
2327 if (ERROR == tpriv->reap_action && LIBUSB_TRANSFER_COMPLETED == tpriv->reap_status)
2328 tpriv->reap_status = LIBUSB_TRANSFER_ERROR;
2330 if (tpriv->num_retired == tpriv->num_urbs) /* nothing to cancel */
2333 /* cancel remaining urbs and wait for their completion before
2334 * reporting results */
2335 discard_urbs(itransfer, urb_idx + 1, tpriv->num_urbs);
2338 usbi_mutex_unlock(&itransfer->lock);
2344 usbi_mutex_unlock(&itransfer->lock);
2345 return CANCELLED == tpriv->reap_action ?
2346 usbi_handle_transfer_cancellation(itransfer) :
2347 usbi_handle_transfer_completion(itransfer, tpriv->reap_status);
2350 static int handle_iso_completion(struct usbi_transfer *itransfer,
2351 struct usbfs_urb *urb)
2353 struct libusb_transfer *transfer =
2354 USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
2355 struct linux_transfer_priv *tpriv = usbi_transfer_get_os_priv(itransfer);
2356 int num_urbs = tpriv->num_urbs;
2359 enum libusb_transfer_status status = LIBUSB_TRANSFER_COMPLETED;
2361 usbi_mutex_lock(&itransfer->lock);
2362 for (i = 0; i < num_urbs; i++) {
2363 if (urb == tpriv->iso_urbs[i]) {
2369 usbi_err(TRANSFER_CTX(transfer), "could not locate urb!");
2370 usbi_mutex_unlock(&itransfer->lock);
2371 return LIBUSB_ERROR_NOT_FOUND;
2374 usbi_dbg("handling completion status %d of iso urb %d/%d", urb->status,
2377 /* copy isochronous results back in */
2379 for (i = 0; i < urb->number_of_packets; i++) {
2380 struct usbfs_iso_packet_desc *urb_desc = &urb->iso_frame_desc[i];
2381 struct libusb_iso_packet_descriptor *lib_desc =
2382 &transfer->iso_packet_desc[tpriv->iso_packet_offset++];
2383 lib_desc->status = LIBUSB_TRANSFER_COMPLETED;
2384 switch (urb_desc->status) {
2387 case -ENOENT: /* cancelled */
2392 usbi_dbg("device removed");
2393 lib_desc->status = LIBUSB_TRANSFER_NO_DEVICE;
2396 usbi_dbg("detected endpoint stall");
2397 lib_desc->status = LIBUSB_TRANSFER_STALL;
2400 usbi_dbg("overflow error");
2401 lib_desc->status = LIBUSB_TRANSFER_OVERFLOW;
2409 usbi_dbg("low-level USB error %d", urb_desc->status);
2410 lib_desc->status = LIBUSB_TRANSFER_ERROR;
2413 usbi_warn(TRANSFER_CTX(transfer),
2414 "unrecognised urb status %d", urb_desc->status);
2415 lib_desc->status = LIBUSB_TRANSFER_ERROR;
2418 lib_desc->actual_length = urb_desc->actual_length;
2421 tpriv->num_retired++;
2423 if (tpriv->reap_action != NORMAL) { /* cancelled or submit_fail */
2424 usbi_dbg("CANCEL: urb status %d", urb->status);
2426 if (tpriv->num_retired == num_urbs) {
2427 usbi_dbg("CANCEL: last URB handled, reporting");
2428 free_iso_urbs(tpriv);
2429 if (tpriv->reap_action == CANCELLED) {
2430 usbi_mutex_unlock(&itransfer->lock);
2431 return usbi_handle_transfer_cancellation(itransfer);
2433 usbi_mutex_unlock(&itransfer->lock);
2434 return usbi_handle_transfer_completion(itransfer,
2435 LIBUSB_TRANSFER_ERROR);
2441 switch (urb->status) {
2444 case -ENOENT: /* cancelled */
2448 usbi_dbg("device removed");
2449 status = LIBUSB_TRANSFER_NO_DEVICE;
2452 usbi_warn(TRANSFER_CTX(transfer),
2453 "unrecognised urb status %d", urb->status);
2454 status = LIBUSB_TRANSFER_ERROR;
2458 /* if we're the last urb then we're done */
2459 if (urb_idx == num_urbs) {
2460 usbi_dbg("last URB in transfer --> complete!");
2461 free_iso_urbs(tpriv);
2462 usbi_mutex_unlock(&itransfer->lock);
2463 return usbi_handle_transfer_completion(itransfer, status);
2467 usbi_mutex_unlock(&itransfer->lock);
2471 static int handle_control_completion(struct usbi_transfer *itransfer,
2472 struct usbfs_urb *urb)
2474 struct linux_transfer_priv *tpriv = usbi_transfer_get_os_priv(itransfer);
2477 usbi_mutex_lock(&itransfer->lock);
2478 usbi_dbg("handling completion status %d", urb->status);
2480 itransfer->transferred += urb->actual_length;
2482 if (tpriv->reap_action == CANCELLED) {
2483 if (urb->status != 0 && urb->status != -ENOENT)
2484 usbi_warn(ITRANSFER_CTX(itransfer),
2485 "cancel: unrecognised urb status %d", urb->status);
2488 usbi_mutex_unlock(&itransfer->lock);
2489 return usbi_handle_transfer_cancellation(itransfer);
2492 switch (urb->status) {
2494 status = LIBUSB_TRANSFER_COMPLETED;
2496 case -ENOENT: /* cancelled */
2497 status = LIBUSB_TRANSFER_CANCELLED;
2501 usbi_dbg("device removed");
2502 status = LIBUSB_TRANSFER_NO_DEVICE;
2505 usbi_dbg("unsupported control request");
2506 status = LIBUSB_TRANSFER_STALL;
2509 usbi_dbg("control overflow error");
2510 status = LIBUSB_TRANSFER_OVERFLOW;
2517 usbi_dbg("low-level bus error occurred");
2518 status = LIBUSB_TRANSFER_ERROR;
2521 usbi_warn(ITRANSFER_CTX(itransfer),
2522 "unrecognised urb status %d", urb->status);
2523 status = LIBUSB_TRANSFER_ERROR;
2529 usbi_mutex_unlock(&itransfer->lock);
2530 return usbi_handle_transfer_completion(itransfer, status);
2533 static int reap_for_handle(struct libusb_device_handle *handle)
2535 struct linux_device_handle_priv *hpriv = _device_handle_priv(handle);
2537 struct usbfs_urb *urb;
2538 struct usbi_transfer *itransfer;
2539 struct libusb_transfer *transfer;
2541 r = ioctl(hpriv->fd, IOCTL_USBFS_REAPURBNDELAY, &urb);
2542 if (r == -1 && errno == EAGAIN)
2545 if (errno == ENODEV)
2546 return LIBUSB_ERROR_NO_DEVICE;
2548 usbi_err(HANDLE_CTX(handle), "reap failed error %d errno=%d",
2550 return LIBUSB_ERROR_IO;
2553 itransfer = urb->usercontext;
2554 transfer = USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
2556 usbi_dbg("urb type=%d status=%d transferred=%d", urb->type, urb->status,
2557 urb->actual_length);
2559 switch (transfer->type) {
2560 case LIBUSB_TRANSFER_TYPE_ISOCHRONOUS:
2561 return handle_iso_completion(itransfer, urb);
2562 case LIBUSB_TRANSFER_TYPE_BULK:
2563 case LIBUSB_TRANSFER_TYPE_BULK_STREAM:
2564 case LIBUSB_TRANSFER_TYPE_INTERRUPT:
2565 return handle_bulk_completion(itransfer, urb);
2566 case LIBUSB_TRANSFER_TYPE_CONTROL:
2567 return handle_control_completion(itransfer, urb);
2569 usbi_err(HANDLE_CTX(handle), "unrecognised endpoint type %x",
2571 return LIBUSB_ERROR_OTHER;
2575 static int op_handle_events(struct libusb_context *ctx,
2576 struct pollfd *fds, POLL_NFDS_TYPE nfds, int num_ready)
2581 usbi_mutex_lock(&ctx->open_devs_lock);
2582 for (i = 0; i < nfds && num_ready > 0; i++) {
2583 struct pollfd *pollfd = &fds[i];
2584 struct libusb_device_handle *handle;
2585 struct linux_device_handle_priv *hpriv = NULL;
2587 if (!pollfd->revents)
2591 list_for_each_entry(handle, &ctx->open_devs, list, struct libusb_device_handle) {
2592 hpriv = _device_handle_priv(handle);
2593 if (hpriv->fd == pollfd->fd)
2597 if (!hpriv || hpriv->fd != pollfd->fd) {
2598 usbi_err(ctx, "cannot find handle for fd %d",
2603 if (pollfd->revents & POLLERR) {
2604 /* remove the fd from the pollfd set so that it doesn't continuously
2605 * trigger an event, and flag that it has been removed so op_close()
2606 * doesn't try to remove it a second time */
2607 usbi_remove_pollfd(HANDLE_CTX(handle), hpriv->fd);
2608 hpriv->fd_removed = 1;
2610 /* device will still be marked as attached if hotplug monitor thread
2611 * hasn't processed remove event yet */
2612 usbi_mutex_static_lock(&linux_hotplug_lock);
2613 if (handle->dev->attached)
2614 linux_device_disconnected(handle->dev->bus_number,
2615 handle->dev->device_address);
2616 usbi_mutex_static_unlock(&linux_hotplug_lock);
2618 if (!(hpriv->caps & USBFS_CAP_REAP_AFTER_DISCONNECT)) {
2619 usbi_handle_disconnect(handle);
2625 r = reap_for_handle(handle);
2627 if (r == 1 || r == LIBUSB_ERROR_NO_DEVICE)
2635 usbi_mutex_unlock(&ctx->open_devs_lock);
2639 static int op_clock_gettime(int clk_id, struct timespec *tp)
2642 case USBI_CLOCK_MONOTONIC:
2643 return clock_gettime(monotonic_clkid, tp);
2644 case USBI_CLOCK_REALTIME:
2645 return clock_gettime(CLOCK_REALTIME, tp);
2647 return LIBUSB_ERROR_INVALID_PARAM;
2651 #ifdef USBI_TIMERFD_AVAILABLE
2652 static clockid_t op_get_timerfd_clockid(void)
2654 return monotonic_clkid;
2659 const struct usbi_os_backend linux_usbfs_backend = {
2660 .name = "Linux usbfs",
2661 .caps = USBI_CAP_HAS_HID_ACCESS|USBI_CAP_SUPPORTS_DETACH_KERNEL_DRIVER,
2664 .get_device_list = NULL,
2665 .hotplug_poll = op_hotplug_poll,
2666 .get_device_descriptor = op_get_device_descriptor,
2667 .get_active_config_descriptor = op_get_active_config_descriptor,
2668 .get_config_descriptor = op_get_config_descriptor,
2669 .get_config_descriptor_by_value = op_get_config_descriptor_by_value,
2673 .get_configuration = op_get_configuration,
2674 .set_configuration = op_set_configuration,
2675 .claim_interface = op_claim_interface,
2676 .release_interface = op_release_interface,
2678 .set_interface_altsetting = op_set_interface,
2679 .clear_halt = op_clear_halt,
2680 .reset_device = op_reset_device,
2682 .alloc_streams = op_alloc_streams,
2683 .free_streams = op_free_streams,
2685 .kernel_driver_active = op_kernel_driver_active,
2686 .detach_kernel_driver = op_detach_kernel_driver,
2687 .attach_kernel_driver = op_attach_kernel_driver,
2689 .destroy_device = op_destroy_device,
2691 .submit_transfer = op_submit_transfer,
2692 .cancel_transfer = op_cancel_transfer,
2693 .clear_transfer_priv = op_clear_transfer_priv,
2695 .handle_events = op_handle_events,
2697 .clock_gettime = op_clock_gettime,
2699 #ifdef USBI_TIMERFD_AVAILABLE
2700 .get_timerfd_clockid = op_get_timerfd_clockid,
2703 .device_priv_size = sizeof(struct linux_device_priv),
2704 .device_handle_priv_size = sizeof(struct linux_device_handle_priv),
2705 .transfer_priv_size = sizeof(struct linux_transfer_priv),