summaryrefslogtreecommitdiffstats
path: root/libusb-1.0/libusb/os/linux_usbfs.c
diff options
context:
space:
mode:
Diffstat (limited to '')
-rw-r--r--libusb-1.0/libusb/os/linux_usbfs.c2220
1 files changed, 0 insertions, 2220 deletions
diff --git a/libusb-1.0/libusb/os/linux_usbfs.c b/libusb-1.0/libusb/os/linux_usbfs.c
deleted file mode 100644
index 5c2a6e8..0000000
--- a/libusb-1.0/libusb/os/linux_usbfs.c
+++ /dev/null
@@ -1,2220 +0,0 @@
-/*
- * Linux usbfs backend for libusb
- * Copyright (C) 2007-2009 Daniel Drake <dsd@gentoo.org>
- * Copyright (c) 2001 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 <ctype.h>
-#include <dirent.h>
-#include <errno.h>
-#include <fcntl.h>
-#include <poll.h>
-#include <pthread.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <sys/ioctl.h>
-#include <sys/stat.h>
-#include <sys/types.h>
-#include <sys/utsname.h>
-#include <unistd.h>
-
-#include "libusb.h"
-#include "libusbi.h"
-#include "linux_usbfs.h"
-
-/* sysfs vs usbfs:
- * opening a usbfs node causes the device to be resumed, so we attempt to
- * avoid this during enumeration.
- *
- * sysfs allows us to read the kernel's in-memory copies of device descriptors
- * and so forth, avoiding the need to open the device:
- * - The binary "descriptors" file was added in 2.6.23.
- * - The "busnum" file was added in 2.6.22
- * - The "devnum" file has been present since pre-2.6.18
- * - the "bConfigurationValue" file has been present since pre-2.6.18
- *
- * If we have bConfigurationValue, busnum, and devnum, then we can determine
- * the active configuration without having to open the usbfs node in RDWR mode.
- * We assume this is the case if we see the busnum file (indicates 2.6.22+).
- * The busnum file is important as that is the only way we can relate sysfs
- * devices to usbfs nodes.
- *
- * If we also have descriptors, we can obtain the device descriptor and active
- * configuration without touching usbfs at all.
- *
- * The descriptors file originally only contained the active configuration
- * descriptor alongside the device descriptor, but all configurations are
- * included as of Linux 2.6.26.
- */
-
-/* endianness for multi-byte fields:
- *
- * Descriptors exposed by usbfs have the multi-byte fields in the device
- * descriptor as host endian. Multi-byte fields in the other descriptors are
- * bus-endian. The kernel documentation says otherwise, but it is wrong.
- */
-
-static const char *usbfs_path = NULL;
-
-/* Linux 2.6.32 adds support for a bulk continuation URB flag. this basically
- * allows us to mark URBs as being part of a specific logical transfer when
- * we submit them to the kernel. then, on any error error except a
- * cancellation, all URBs within that transfer will be cancelled with the
- * endpoint is disabled, meaning that no more data can creep in during the
- * time it takes to cancel the remaining URBs.
- *
- * The BULK_CONTINUATION flag must be set on all URBs within a bulk transfer
- * (in either direction) except the first.
- * For IN transfers, we must also set SHORT_NOT_OK on all the URBs.
- * For OUT transfers, SHORT_NOT_OK must not be set. The effective behaviour
- * (where an OUT transfer does not complete, the rest of the URBs in the
- * transfer get cancelled) is already in effect, and setting this flag is
- * disallowed (a kernel with USB debugging enabled will reject such URBs).
- */
-static int supports_flag_bulk_continuation = -1;
-
-/* clock ID for monotonic clock, as not all clock sources are available on all
- * systems. appropriate choice made at initialization time. */
-static clockid_t monotonic_clkid = -1;
-
-/* do we have a busnum to relate devices? this also implies that we can read
- * the active configuration through bConfigurationValue */
-static int sysfs_can_relate_devices = -1;
-
-/* do we have a descriptors file? */
-static int sysfs_has_descriptors = -1;
-
-struct linux_device_priv {
- char *sysfs_dir;
- unsigned char *dev_descriptor;
- unsigned char *config_descriptor;
-};
-
-struct linux_device_handle_priv {
- int fd;
-};
-
-enum reap_action {
- NORMAL = 0,
- /* submission failed after the first URB, so await cancellation/completion
- * of all the others */
- SUBMIT_FAILED,
-
- /* cancelled by user or timeout */
- CANCELLED,
-
- /* completed multi-URB transfer in non-final URB */
- COMPLETED_EARLY,
-
- /* one or more urbs encountered a low-level error */
- ERROR,
-};
-
-struct linux_transfer_priv {
- union {
- struct usbfs_urb *urbs;
- struct usbfs_urb **iso_urbs;
- };
-
- enum reap_action reap_action;
- int num_urbs;
- unsigned int num_retired;
- enum libusb_transfer_status reap_status;
-
- /* next iso packet in user-supplied transfer to be populated */
- int iso_packet_offset;
-};
-
-static void __get_usbfs_path(struct libusb_device *dev, char *path)
-{
- snprintf(path, PATH_MAX, "%s/%03d/%03d", usbfs_path, dev->bus_number,
- dev->device_address);
-}
-
-static struct linux_device_priv *__device_priv(struct libusb_device *dev)
-{
- return (struct linux_device_priv *) dev->os_priv;
-}
-
-static struct linux_device_handle_priv *__device_handle_priv(
- struct libusb_device_handle *handle)
-{
- return (struct linux_device_handle_priv *) handle->os_priv;
-}
-
-static int check_usb_vfs(const char *dirname)
-{
- DIR *dir;
- struct dirent *entry;
- int found = 0;
-
- dir = opendir(dirname);
- if (!dir)
- return 0;
-
- while ((entry = readdir(dir)) != NULL) {
- if (entry->d_name[0] == '.')
- continue;
-
- /* We assume if we find any files that it must be the right place */
- found = 1;
- break;
- }
-
- closedir(dir);
- return found;
-}
-
-static const char *find_usbfs_path(void)
-{
- const char *path = "/dev/bus/usb";
- const char *ret = NULL;
-
- if (check_usb_vfs(path)) {
- ret = path;
- } else {
- path = "/proc/bus/usb";
- if (check_usb_vfs(path))
- ret = path;
- }
-
- usbi_dbg("found usbfs at %s", ret);
- return ret;
-}
-
-/* the monotonic clock is not usable on all systems (e.g. embedded ones often
- * seem to lack it). fall back to REALTIME if we have to. */
-static clockid_t find_monotonic_clock(void)
-{
- struct timespec ts;
- int r;
-
-#ifdef CLOCK_MONOTONIC
- /* Linux 2.6.28 adds CLOCK_MONOTONIC_RAW but we don't use it
- * because it's not available through timerfd */
- r = clock_gettime(CLOCK_MONOTONIC, &ts);
- if (r == 0)
- return CLOCK_MONOTONIC;
- usbi_dbg("monotonic clock doesn't work, errno %d", errno);
-#endif
-
- return CLOCK_REALTIME;
-}
-
-/* bulk continuation URB flag available from Linux 2.6.32 */
-static int check_flag_bulk_continuation(void)
-{
- struct utsname uts;
- int sublevel;
-
- if (uname(&uts) < 0)
- return -1;
- if (strlen(uts.release) < 4)
- return 0;
- if (strncmp(uts.release, "2.6.", 4) != 0)
- return 0;
-
- sublevel = atoi(uts.release + 4);
- return sublevel >= 32;
-}
-
-static int op_init(struct libusb_context *ctx)
-{
- struct stat statbuf;
- int r;
-
- usbfs_path = find_usbfs_path();
- if (!usbfs_path) {
- usbi_err(ctx, "could not find usbfs");
- return LIBUSB_ERROR_OTHER;
- }
-
- if (monotonic_clkid == -1)
- monotonic_clkid = find_monotonic_clock();
-
- if (supports_flag_bulk_continuation == -1) {
- supports_flag_bulk_continuation = check_flag_bulk_continuation();
- if (supports_flag_bulk_continuation == -1) {
- usbi_err(ctx, "error checking for bulk continuation support");
- return LIBUSB_ERROR_OTHER;
- }
- }
-
- if (supports_flag_bulk_continuation)
- usbi_dbg("bulk continuation flag supported");
-
- r = stat(SYSFS_DEVICE_PATH, &statbuf);
- if (r == 0 && S_ISDIR(statbuf.st_mode)) {
- usbi_dbg("found usb devices in sysfs");
- } else {
- usbi_dbg("sysfs usb info not available");
- sysfs_has_descriptors = 0;
- sysfs_can_relate_devices = 0;
- }
-
- return 0;
-}
-
-static int usbfs_get_device_descriptor(struct libusb_device *dev,
- unsigned char *buffer)
-{
- struct linux_device_priv *priv = __device_priv(dev);
-
- /* return cached copy */
- memcpy(buffer, priv->dev_descriptor, DEVICE_DESC_LENGTH);
- return 0;
-}
-
-static int __open_sysfs_attr(struct libusb_device *dev, const char *attr)
-{
- struct linux_device_priv *priv = __device_priv(dev);
- char filename[PATH_MAX];
- int fd;
-
- snprintf(filename, PATH_MAX, "%s/%s/%s",
- SYSFS_DEVICE_PATH, priv->sysfs_dir, attr);
- fd = open(filename, O_RDONLY);
- if (fd < 0) {
- usbi_err(DEVICE_CTX(dev),
- "open %s failed ret=%d errno=%d", filename, fd, errno);
- return LIBUSB_ERROR_IO;
- }
-
- return fd;
-}
-
-static int sysfs_get_device_descriptor(struct libusb_device *dev,
- unsigned char *buffer)
-{
- int fd;
- ssize_t r;
-
- /* sysfs provides access to an in-memory copy of the device descriptor,
- * so we use that rather than keeping our own copy */
-
- fd = __open_sysfs_attr(dev, "descriptors");
- if (fd < 0)
- return fd;
-
- r = read(fd, buffer, DEVICE_DESC_LENGTH);;
- close(fd);
- if (r < 0) {
- usbi_err(DEVICE_CTX(dev), "read failed, ret=%d errno=%d", fd, errno);
- return LIBUSB_ERROR_IO;
- } else if (r < DEVICE_DESC_LENGTH) {
- usbi_err(DEVICE_CTX(dev), "short read %d/%d", r, DEVICE_DESC_LENGTH);
- return LIBUSB_ERROR_IO;
- }
-
- return 0;
-}
-
-static int op_get_device_descriptor(struct libusb_device *dev,
- unsigned char *buffer, int *host_endian)
-{
- if (sysfs_has_descriptors) {
- return sysfs_get_device_descriptor(dev, buffer);
- } else {
- *host_endian = 1;
- return usbfs_get_device_descriptor(dev, buffer);
- }
-}
-
-static int usbfs_get_active_config_descriptor(struct libusb_device *dev,
- unsigned char *buffer, size_t len)
-{
- struct linux_device_priv *priv = __device_priv(dev);
- if (!priv->config_descriptor)
- return LIBUSB_ERROR_NOT_FOUND; /* device is unconfigured */
-
- /* retrieve cached copy */
- memcpy(buffer, priv->config_descriptor, len);
- return 0;
-}
-
-/* read the bConfigurationValue for a device */
-static int sysfs_get_active_config(struct libusb_device *dev, int *config)
-{
- char *endptr;
- char tmp[4] = {0, 0, 0, 0};
- long num;
- int fd;
- size_t r;
-
- fd = __open_sysfs_attr(dev, "bConfigurationValue");
- if (fd < 0)
- return fd;
-
- r = read(fd, tmp, sizeof(tmp));
- close(fd);
- if (r < 0) {
- usbi_err(DEVICE_CTX(dev),
- "read bConfigurationValue failed ret=%d errno=%d", r, errno);
- return LIBUSB_ERROR_IO;
- } else if (r == 0) {
- usbi_err(DEVICE_CTX(dev), "device unconfigured");
- *config = -1;
- return 0;
- }
-
- if (tmp[sizeof(tmp) - 1] != 0) {
- usbi_err(DEVICE_CTX(dev), "not null-terminated?");
- return LIBUSB_ERROR_IO;
- } else if (tmp[0] == 0) {
- usbi_err(DEVICE_CTX(dev), "no configuration value?");
- return LIBUSB_ERROR_IO;
- }
-
- num = strtol(tmp, &endptr, 10);
- if (endptr == tmp) {
- usbi_err(DEVICE_CTX(dev), "error converting '%s' to integer", tmp);
- return LIBUSB_ERROR_IO;
- }
-
- *config = (int) num;
- return 0;
-}
-
-/* takes a usbfs/descriptors fd seeked to the start of a configuration, and
- * seeks to the next one. */
-static int seek_to_next_config(struct libusb_context *ctx, int fd,
- int host_endian)
-{
- struct libusb_config_descriptor config;
- unsigned char tmp[6];
- off_t off;
- int r;
-
- /* read first 6 bytes of descriptor */
- r = read(fd, tmp, sizeof(tmp));
- if (r < 0) {
- usbi_err(ctx, "read failed ret=%d errno=%d", r, errno);
- return LIBUSB_ERROR_IO;
- } else if (r < sizeof(tmp)) {
- usbi_err(ctx, "short descriptor read %d/%d", r, sizeof(tmp));
- return LIBUSB_ERROR_IO;
- }
-
- /* seek forward to end of config */
- usbi_parse_descriptor(tmp, "bbwbb", &config, host_endian);
- off = lseek(fd, config.wTotalLength - sizeof(tmp), SEEK_CUR);
- if (off < 0) {
- usbi_err(ctx, "seek failed ret=%d errno=%d", off, errno);
- return LIBUSB_ERROR_IO;
- }
-
- return 0;
-}
-
-static int sysfs_get_active_config_descriptor(struct libusb_device *dev,
- unsigned char *buffer, size_t len)
-{
- int fd;
- ssize_t r;
- off_t off;
- int to_copy;
- int config;
- unsigned char tmp[6];
-
- r = sysfs_get_active_config(dev, &config);
- if (r < 0)
- return r;
- if (config == -1)
- return LIBUSB_ERROR_NOT_FOUND;
-
- usbi_dbg("active configuration %d", config);
-
- /* sysfs provides access to an in-memory copy of the device descriptor,
- * so we use that rather than keeping our own copy */
-
- fd = __open_sysfs_attr(dev, "descriptors");
- if (fd < 0)
- return fd;
-
- /* device might have been unconfigured since we read bConfigurationValue,
- * so first check that there is any config descriptor data at all... */
- off = lseek(fd, 0, SEEK_END);
- if (off < 1) {
- usbi_err(DEVICE_CTX(dev), "end seek failed, ret=%d errno=%d",
- off, errno);
- close(fd);
- return LIBUSB_ERROR_IO;
- } else if (off == DEVICE_DESC_LENGTH) {
- close(fd);
- return LIBUSB_ERROR_NOT_FOUND;
- }
-
- off = lseek(fd, DEVICE_DESC_LENGTH, SEEK_SET);
- if (off < 0) {
- usbi_err(DEVICE_CTX(dev), "seek failed, ret=%d errno=%d", off, errno);
- close(fd);
- return LIBUSB_ERROR_IO;
- }
-
- /* unbounded loop: we expect the descriptor to be present under all
- * circumstances */
- while (1) {
- r = read(fd, tmp, sizeof(tmp));
- if (r < 0) {
- usbi_err(DEVICE_CTX(dev), "read failed, ret=%d errno=%d",
- fd, errno);
- return LIBUSB_ERROR_IO;
- } else if (r < sizeof(tmp)) {
- usbi_err(DEVICE_CTX(dev), "short read %d/%d", r, sizeof(tmp));
- return LIBUSB_ERROR_IO;
- }
-
- /* check bConfigurationValue */
- if (tmp[5] == config)
- break;
-
- /* try the next descriptor */
- off = lseek(fd, 0 - sizeof(tmp), SEEK_CUR);
- if (off < 0)
- return LIBUSB_ERROR_IO;
-
- r = seek_to_next_config(DEVICE_CTX(dev), fd, 0);
- if (r < 0)
- return r;
- }
-
- to_copy = (len < sizeof(tmp)) ? len : sizeof(tmp);
- memcpy(buffer, tmp, to_copy);
- if (len > sizeof(tmp)) {
- r = read(fd, buffer + sizeof(tmp), len - sizeof(tmp));
- if (r < 0) {
- usbi_err(DEVICE_CTX(dev), "read failed, ret=%d errno=%d",
- fd, errno);
- r = LIBUSB_ERROR_IO;
- } else if (r == 0) {
- usbi_dbg("device is unconfigured");
- r = LIBUSB_ERROR_NOT_FOUND;
- } else if (r < len - sizeof(tmp)) {
- usbi_err(DEVICE_CTX(dev), "short read %d/%d", r, len);
- r = LIBUSB_ERROR_IO;
- }
- } else {
- r = 0;
- }
-
- close(fd);
- return r;
-}
-
-static int op_get_active_config_descriptor(struct libusb_device *dev,
- unsigned char *buffer, size_t len, int *host_endian)
-{
- if (sysfs_has_descriptors) {
- return sysfs_get_active_config_descriptor(dev, buffer, len);
- } else {
- return usbfs_get_active_config_descriptor(dev, buffer, len);
- }
-}
-
-/* takes a usbfs fd, attempts to find the requested config and copy a certain
- * amount of it into an output buffer. */
-static int get_config_descriptor(struct libusb_context *ctx, int fd,
- uint8_t config_index, unsigned char *buffer, size_t len)
-{
- off_t off;
- ssize_t r;
-
- off = lseek(fd, DEVICE_DESC_LENGTH, SEEK_SET);
- if (off < 0) {
- usbi_err(ctx, "seek failed ret=%d errno=%d", off, errno);
- return LIBUSB_ERROR_IO;
- }
-
- /* might need to skip some configuration descriptors to reach the
- * requested configuration */
- while (config_index > 0) {
- r = seek_to_next_config(ctx, fd, 1);
- if (r < 0)
- return r;
- config_index--;
- }
-
- /* read the rest of the descriptor */
- r = read(fd, buffer, len);
- if (r < 0) {
- usbi_err(ctx, "read failed ret=%d errno=%d", r, errno);
- return LIBUSB_ERROR_IO;
- } else if (r < len) {
- usbi_err(ctx, "short output read %d/%d", r, len);
- return LIBUSB_ERROR_IO;
- }
-
- return 0;
-}
-
-static int op_get_config_descriptor(struct libusb_device *dev,
- uint8_t config_index, unsigned char *buffer, size_t len, int *host_endian)
-{
- char filename[PATH_MAX];
- int fd;
- int r;
-
- /* always read from usbfs: sysfs only has the active descriptor
- * this will involve waking the device up, but oh well! */
-
- /* FIXME: the above is no longer true, new kernels have all descriptors
- * in the descriptors file. but its kinda hard to detect if the kernel
- * is sufficiently new. */
-
- __get_usbfs_path(dev, filename);
- fd = open(filename, O_RDONLY);
- if (fd < 0) {
- usbi_err(DEVICE_CTX(dev),
- "open '%s' failed, ret=%d errno=%d", filename, fd, errno);
- return LIBUSB_ERROR_IO;
- }
-
- r = get_config_descriptor(DEVICE_CTX(dev), fd, config_index, buffer, len);
- close(fd);
- return r;
-}
-
-/* cache the active config descriptor in memory. a value of -1 means that
- * we aren't sure which one is active, so just assume the first one.
- * only for usbfs. */
-static int cache_active_config(struct libusb_device *dev, int fd,
- int active_config)
-{
- struct linux_device_priv *priv = __device_priv(dev);
- struct libusb_config_descriptor config;
- unsigned char tmp[8];
- unsigned char *buf;
- int idx;
- int r;
-
- if (active_config == -1) {
- idx = 0;
- } else {
- r = usbi_get_config_index_by_value(dev, active_config, &idx);
- if (r < 0)
- return r;
- if (idx == -1)
- return LIBUSB_ERROR_NOT_FOUND;
- }
-
- r = get_config_descriptor(DEVICE_CTX(dev), fd, idx, tmp, sizeof(tmp));
- if (r < 0) {
- usbi_err(DEVICE_CTX(dev), "first read error %d", r);
- return r;
- }
-
- usbi_parse_descriptor(tmp, "bbw", &config, 0);
- buf = malloc(config.wTotalLength);
- if (!buf)
- return LIBUSB_ERROR_NO_MEM;
-
- r = get_config_descriptor(DEVICE_CTX(dev), fd, idx, buf,
- config.wTotalLength);
- if (r < 0) {
- free(buf);
- return r;
- }
-
- if (priv->config_descriptor)
- free(priv->config_descriptor);
- priv->config_descriptor = buf;
- return 0;
-}
-
-/* send a control message to retrieve active configuration */
-static int usbfs_get_active_config(struct libusb_device *dev, int fd)
-{
- unsigned char active_config = 0;
- int r;
-
- struct usbfs_ctrltransfer ctrl = {
- .bmRequestType = LIBUSB_ENDPOINT_IN,
- .bRequest = LIBUSB_REQUEST_GET_CONFIGURATION,
- .wValue = 0,
- .wIndex = 0,
- .wLength = 1,
- .timeout = 1000,
- .data = &active_config
- };
-
- r = ioctl(fd, IOCTL_USBFS_CONTROL, &ctrl);
- if (r < 0) {
- if (errno == ENODEV)
- return LIBUSB_ERROR_NO_DEVICE;
-
- /* we hit this error path frequently with buggy devices :( */
- usbi_warn(DEVICE_CTX(dev),
- "get_configuration failed ret=%d errno=%d", r, errno);
- return LIBUSB_ERROR_IO;
- }
-
- return active_config;
-}
-
-static int initialize_device(struct libusb_device *dev, uint8_t busnum,
- uint8_t devaddr, const char *sysfs_dir)
-{
- struct linux_device_priv *priv = __device_priv(dev);
- unsigned char *dev_buf;
- char path[PATH_MAX];
- int fd;
- int active_config = 0;
- int device_configured = 1;
- ssize_t r;
-
- dev->bus_number = busnum;
- dev->device_address = devaddr;
-
- if (sysfs_dir) {
- priv->sysfs_dir = malloc(strlen(sysfs_dir) + 1);
- if (!priv->sysfs_dir)
- return LIBUSB_ERROR_NO_MEM;
- strcpy(priv->sysfs_dir, sysfs_dir);
- }
-
- if (sysfs_has_descriptors)
- return 0;
-
- /* cache device descriptor in memory so that we can retrieve it later
- * without waking the device up (op_get_device_descriptor) */
-
- priv->dev_descriptor = NULL;
- priv->config_descriptor = NULL;
-
- if (sysfs_can_relate_devices) {
- int tmp = sysfs_get_active_config(dev, &active_config);
- if (tmp < 0)
- return tmp;
- if (active_config == -1)
- device_configured = 0;
- }
-
- __get_usbfs_path(dev, path);
- fd = open(path, O_RDWR);
- if (fd < 0 && errno == EACCES) {
- fd = open(path, O_RDONLY);
- /* if we only have read-only access to the device, we cannot
- * send a control message to determine the active config. just
- * assume the first one is active. */
- active_config = -1;
- }
-
- if (fd < 0) {
- usbi_err(DEVICE_CTX(dev), "open failed, ret=%d errno=%d", fd, errno);
- return LIBUSB_ERROR_IO;
- }
-
- if (!sysfs_can_relate_devices) {
- if (active_config == -1) {
- /* if we only have read-only access to the device, we cannot
- * send a control message to determine the active config. just
- * assume the first one is active. */
- usbi_warn(DEVICE_CTX(dev), "access to %s is read-only; cannot "
- "determine active configuration descriptor", path);
- } else {
- active_config = usbfs_get_active_config(dev, fd);
- if (active_config == LIBUSB_ERROR_IO) {
- /* buggy devices sometimes fail to report their active config.
- * assume unconfigured and continue the probing */
- usbi_warn(DEVICE_CTX(dev), "couldn't query active "
- "configuration, assumung unconfigured");
- device_configured = 0;
- } else if (active_config < 0) {
- close(fd);
- return active_config;
- } else if (active_config == 0) {
- /* some buggy devices have a configuration 0, but we're
- * reaching into the corner of a corner case here, so let's
- * not support buggy devices in these circumstances.
- * stick to the specs: a configuration value of 0 means
- * unconfigured. */
- usbi_dbg("active cfg 0? assuming unconfigured device");
- device_configured = 0;
- }
- }
- }
-
- dev_buf = malloc(DEVICE_DESC_LENGTH);
- if (!dev_buf) {
- close(fd);
- return LIBUSB_ERROR_NO_MEM;
- }
-
- r = read(fd, dev_buf, DEVICE_DESC_LENGTH);
- if (r < 0) {
- usbi_err(DEVICE_CTX(dev),
- "read descriptor failed ret=%d errno=%d", fd, errno);
- free(dev_buf);
- close(fd);
- return LIBUSB_ERROR_IO;
- } else if (r < DEVICE_DESC_LENGTH) {
- usbi_err(DEVICE_CTX(dev), "short descriptor read (%d)", r);
- free(dev_buf);
- close(fd);
- return LIBUSB_ERROR_IO;
- }
-
- /* bit of a hack: set num_configurations now because cache_active_config()
- * calls usbi_get_config_index_by_value() which uses it */
- dev->num_configurations = dev_buf[DEVICE_DESC_LENGTH - 1];
-
- if (device_configured) {
- r = cache_active_config(dev, fd, active_config);
- if (r < 0) {
- close(fd);
- free(dev_buf);
- return r;
- }
- }
-
- close(fd);
- priv->dev_descriptor = dev_buf;
- return 0;
-}
-
-static int enumerate_device(struct libusb_context *ctx,
- struct discovered_devs **_discdevs, uint8_t busnum, uint8_t devaddr,
- const char *sysfs_dir)
-{
- struct discovered_devs *discdevs;
- unsigned long session_id;
- int need_unref = 0;
- struct libusb_device *dev;
- int r = 0;
-
- /* FIXME: session ID is not guaranteed unique as addresses can wrap and
- * will be reused. instead we should add a simple sysfs attribute with
- * a session ID. */
- session_id = busnum << 8 | devaddr;
- usbi_dbg("busnum %d devaddr %d session_id %ld", busnum, devaddr,
- session_id);
-
- dev = usbi_get_device_by_session_id(ctx, session_id);
- if (dev) {
- usbi_dbg("using existing device for %d/%d (session %ld)",
- busnum, devaddr, session_id);
- } else {
- usbi_dbg("allocating new device for %d/%d (session %ld)",
- busnum, devaddr, session_id);
- dev = usbi_alloc_device(ctx, session_id);
- if (!dev)
- return LIBUSB_ERROR_NO_MEM;
- need_unref = 1;
- r = initialize_device(dev, busnum, devaddr, sysfs_dir);
- if (r < 0)
- goto out;
- r = usbi_sanitize_device(dev);
- if (r < 0)
- goto out;
- }
-
- discdevs = discovered_devs_append(*_discdevs, dev);
- if (!discdevs)
- r = LIBUSB_ERROR_NO_MEM;
- else
- *_discdevs = discdevs;
-
-out:
- if (need_unref)
- libusb_unref_device(dev);
- return r;
-}
-
-/* open a bus directory and adds all discovered devices to discdevs. on
- * failure (non-zero return) the pre-existing discdevs should be destroyed
- * (and devices freed). on success, the new discdevs pointer should be used
- * as it may have been moved. */
-static int usbfs_scan_busdir(struct libusb_context *ctx,
- struct discovered_devs **_discdevs, uint8_t busnum)
-{
- DIR *dir;
- char dirpath[PATH_MAX];
- struct dirent *entry;
- struct discovered_devs *discdevs = *_discdevs;
- int r = 0;
-
- snprintf(dirpath, PATH_MAX, "%s/%03d", usbfs_path, busnum);
- usbi_dbg("%s", dirpath);
- dir = opendir(dirpath);
- if (!dir) {
- usbi_err(ctx, "opendir '%s' failed, errno=%d", dirpath, errno);
- /* FIXME: should handle valid race conditions like hub unplugged
- * during directory iteration - this is not an error */
- return LIBUSB_ERROR_IO;
- }
-
- while ((entry = readdir(dir))) {
- int devaddr;
-
- if (entry->d_name[0] == '.')
- continue;
-
- devaddr = atoi(entry->d_name);
- if (devaddr == 0) {
- usbi_dbg("unknown dir entry %s", entry->d_name);
- continue;
- }
-
- r = enumerate_device(ctx, &discdevs, busnum, (uint8_t) devaddr, NULL);
- if (r < 0)
- goto out;
- }
-
- *_discdevs = discdevs;
-out:
- closedir(dir);
- return r;
-}
-
-static int usbfs_get_device_list(struct libusb_context *ctx,
- struct discovered_devs **_discdevs)
-{
- struct dirent *entry;
- DIR *buses = opendir(usbfs_path);
- struct discovered_devs *discdevs = *_discdevs;
- int r = 0;
-
- if (!buses) {
- usbi_err(ctx, "opendir buses failed errno=%d", errno);
- return LIBUSB_ERROR_IO;
- }
-
- while ((entry = readdir(buses))) {
- struct discovered_devs *discdevs_new = discdevs;
- int busnum;
-
- if (entry->d_name[0] == '.')
- continue;
-
- busnum = atoi(entry->d_name);
- if (busnum == 0) {
- usbi_dbg("unknown dir entry %s", entry->d_name);
- continue;
- }
-
- r = usbfs_scan_busdir(ctx, &discdevs_new, busnum);
- if (r < 0)
- goto out;
- discdevs = discdevs_new;
- }
-
-out:
- closedir(buses);
- *_discdevs = discdevs;
- return r;
-
-}
-
-static int sysfs_scan_device(struct libusb_context *ctx,
- struct discovered_devs **_discdevs, const char *devname,
- int *usbfs_fallback)
-{
- int r;
- FILE *fd;
- char filename[PATH_MAX];
- int busnum;
- int devaddr;
-
- usbi_dbg("scan %s", devname);
-
- /* determine descriptors presence ahead of time, we need to know this
- * when we reach initialize_device */
- if (sysfs_has_descriptors == -1) {
- struct stat statbuf;
-
- snprintf(filename, PATH_MAX, "%s/%s/descriptors", SYSFS_DEVICE_PATH,
- devname);
- r = stat(filename, &statbuf);
- if (r == 0 && S_ISREG(statbuf.st_mode)) {
- usbi_dbg("sysfs descriptors available");
- sysfs_has_descriptors = 1;
- } else {
- usbi_dbg("sysfs descriptors not available");
- sysfs_has_descriptors = 0;
- }
- }
-
- snprintf(filename, PATH_MAX, "%s/%s/busnum", SYSFS_DEVICE_PATH, devname);
- fd = fopen(filename, "r");
- if (!fd) {
- if (errno == ENOENT) {
- usbi_dbg("busnum not found, cannot relate sysfs to usbfs, "
- "falling back on pure usbfs");
- sysfs_can_relate_devices = 0;
- *usbfs_fallback = 1;
- return LIBUSB_ERROR_OTHER;
- }
- usbi_err(ctx, "open busnum failed, errno=%d", errno);
- return LIBUSB_ERROR_IO;
- }
-
- sysfs_can_relate_devices = 1;
-
- r = fscanf(fd, "%d", &busnum);
- fclose(fd);
- if (r != 1) {
- usbi_err(ctx, "fscanf busnum returned %d, errno=%d", r, errno);
- return LIBUSB_ERROR_IO;
- }
-
- snprintf(filename, PATH_MAX, "%s/%s/devnum", SYSFS_DEVICE_PATH, devname);
- fd = fopen(filename, "r");
- if (!fd) {
- usbi_err(ctx, "open devnum failed, errno=%d", errno);
- return LIBUSB_ERROR_IO;
- }
-
- r = fscanf(fd, "%d", &devaddr);
- fclose(fd);
- if (r != 1) {
- usbi_err(ctx, "fscanf devnum returned %d, errno=%d", r, errno);
- return LIBUSB_ERROR_IO;
- }
-
- usbi_dbg("bus=%d dev=%d", busnum, devaddr);
- if (busnum > 255 || devaddr > 255)
- return LIBUSB_ERROR_INVALID_PARAM;
-
- return enumerate_device(ctx, _discdevs, busnum & 0xff, devaddr & 0xff,
- devname);
-}
-
-static int sysfs_get_device_list(struct libusb_context *ctx,
- struct discovered_devs **_discdevs, int *usbfs_fallback)
-{
- struct discovered_devs *discdevs = *_discdevs;
- DIR *devices = opendir(SYSFS_DEVICE_PATH);
- struct dirent *entry;
- int r = 0;
-
- if (!devices) {
- usbi_err(ctx, "opendir devices failed errno=%d", errno);
- return LIBUSB_ERROR_IO;
- }
-
- while ((entry = readdir(devices))) {
- struct discovered_devs *discdevs_new = discdevs;
-
- if ((!isdigit(entry->d_name[0]) && strncmp(entry->d_name, "usb", 3))
- || strchr(entry->d_name, ':'))
- continue;
-
- r = sysfs_scan_device(ctx, &discdevs_new, entry->d_name,
- usbfs_fallback);
- if (r < 0)
- goto out;
- discdevs = discdevs_new;
- }
-
-out:
- closedir(devices);
- *_discdevs = discdevs;
- return r;
-}
-
-static int op_get_device_list(struct libusb_context *ctx,
- struct discovered_devs **_discdevs)
-{
- /* we can retrieve device list and descriptors from sysfs or usbfs.
- * sysfs is preferable, because if we use usbfs we end up resuming
- * any autosuspended USB devices. however, sysfs is not available
- * everywhere, so we need a usbfs fallback too.
- *
- * as described in the "sysfs vs usbfs" comment, sometimes we have
- * sysfs but not enough information to relate sysfs devices to usbfs
- * nodes. the usbfs_fallback variable is used to indicate that we should
- * fall back on usbfs.
- */
- if (sysfs_can_relate_devices != 0) {
- int usbfs_fallback = 0;
- int r = sysfs_get_device_list(ctx, _discdevs, &usbfs_fallback);
- if (!usbfs_fallback)
- return r;
- }
-
- return usbfs_get_device_list(ctx, _discdevs);
-}
-
-static int op_open(struct libusb_device_handle *handle)
-{
- struct linux_device_handle_priv *hpriv = __device_handle_priv(handle);
- char filename[PATH_MAX];
-
- __get_usbfs_path(handle->dev, filename);
- hpriv->fd = open(filename, O_RDWR);
- if (hpriv->fd < 0) {
- if (errno == EACCES) {
- usbi_err(HANDLE_CTX(handle), "libusb couldn't open USB device %s: "
- "Permission denied.", filename);
- usbi_err(HANDLE_CTX(handle),
- "libusb requires write access to USB device nodes.");
- return LIBUSB_ERROR_ACCESS;
- } else if (errno == ENOENT) {
- return LIBUSB_ERROR_NO_DEVICE;
- } else {
- usbi_err(HANDLE_CTX(handle),
- "open failed, code %d errno %d", hpriv->fd, errno);
- return LIBUSB_ERROR_IO;
- }
- }
-
- return usbi_add_pollfd(HANDLE_CTX(handle), hpriv->fd, POLLOUT);
-}
-
-static void op_close(struct libusb_device_handle *dev_handle)
-{
- int fd = __device_handle_priv(dev_handle)->fd;
- usbi_remove_pollfd(HANDLE_CTX(dev_handle), fd);
- close(fd);
-}
-
-static int op_get_configuration(struct libusb_device_handle *handle,
- int *config)
-{
- int r;
- if (sysfs_can_relate_devices != 1)
- return LIBUSB_ERROR_NOT_SUPPORTED;
-
- r = sysfs_get_active_config(handle->dev, config);
- if (*config == -1)
- *config = 0;
-
- return 0;
-}
-
-static int op_set_configuration(struct libusb_device_handle *handle, int config)
-{
- struct linux_device_priv *priv = __device_priv(handle->dev);
- int fd = __device_handle_priv(handle)->fd;
- int r = ioctl(fd, IOCTL_USBFS_SETCONFIG, &config);
- if (r) {
- if (errno == EINVAL)
- return LIBUSB_ERROR_NOT_FOUND;
- else if (errno == EBUSY)
- return LIBUSB_ERROR_BUSY;
- else if (errno == ENODEV)
- return LIBUSB_ERROR_NO_DEVICE;
-
- usbi_err(HANDLE_CTX(handle), "failed, error %d errno %d", r, errno);
- return LIBUSB_ERROR_OTHER;
- }
-
- if (!sysfs_has_descriptors) {
- /* update our cached active config descriptor */
- if (config == -1) {
- if (priv->config_descriptor) {
- free(priv->config_descriptor);
- priv->config_descriptor = NULL;
- }
- } else {
- r = cache_active_config(handle->dev, fd, config);
- if (r < 0)
- usbi_warn(HANDLE_CTX(handle),
- "failed to update cached config descriptor, error %d", r);
- }
- }
-
- return 0;
-}
-
-static int op_claim_interface(struct libusb_device_handle *handle, int iface)
-{
- int fd = __device_handle_priv(handle)->fd;
- int r = ioctl(fd, IOCTL_USBFS_CLAIMINTF, &iface);
- if (r) {
- if (errno == ENOENT)
- return LIBUSB_ERROR_NOT_FOUND;
- else if (errno == EBUSY)
- return LIBUSB_ERROR_BUSY;
- else if (errno == ENODEV)
- return LIBUSB_ERROR_NO_DEVICE;
-
- usbi_err(HANDLE_CTX(handle),
- "claim interface failed, error %d errno %d", r, errno);
- return LIBUSB_ERROR_OTHER;
- }
- return 0;
-}
-
-static int op_release_interface(struct libusb_device_handle *handle, int iface)
-{
- int fd = __device_handle_priv(handle)->fd;
- int r = ioctl(fd, IOCTL_USBFS_RELEASEINTF, &iface);
- if (r) {
- if (errno == ENODEV)
- return LIBUSB_ERROR_NO_DEVICE;
-
- usbi_err(HANDLE_CTX(handle),
- "release interface failed, error %d errno %d", r, errno);
- return LIBUSB_ERROR_OTHER;
- }
- return 0;
-}
-
-static int op_set_interface(struct libusb_device_handle *handle, int iface,
- int altsetting)
-{
- int fd = __device_handle_priv(handle)->fd;
- struct usbfs_setinterface setintf;
- int r;
-
- setintf.interface = iface;
- setintf.altsetting = altsetting;
- r = ioctl(fd, IOCTL_USBFS_SETINTF, &setintf);
- if (r) {
- if (errno == EINVAL)
- return LIBUSB_ERROR_NOT_FOUND;
- else if (errno == ENODEV)
- return LIBUSB_ERROR_NO_DEVICE;
-
- usbi_err(HANDLE_CTX(handle),
- "setintf failed error %d errno %d", r, errno);
- return LIBUSB_ERROR_OTHER;
- }
-
- return 0;
-}
-
-static int op_clear_halt(struct libusb_device_handle *handle,
- unsigned char endpoint)
-{
- int fd = __device_handle_priv(handle)->fd;
- unsigned int _endpoint = endpoint;
- int r = ioctl(fd, IOCTL_USBFS_CLEAR_HALT, &_endpoint);
- if (r) {
- if (errno == ENOENT)
- return LIBUSB_ERROR_NOT_FOUND;
- else if (errno == ENODEV)
- return LIBUSB_ERROR_NO_DEVICE;
-
- usbi_err(HANDLE_CTX(handle),
- "clear_halt failed error %d errno %d", r, errno);
- return LIBUSB_ERROR_OTHER;
- }
-
- return 0;
-}
-
-static int op_reset_device(struct libusb_device_handle *handle)
-{
- int fd = __device_handle_priv(handle)->fd;
- int r = ioctl(fd, IOCTL_USBFS_RESET, NULL);
- if (r) {
- if (errno == ENODEV)
- return LIBUSB_ERROR_NOT_FOUND;
-
- usbi_err(HANDLE_CTX(handle),
- "reset failed error %d errno %d", r, errno);
- return LIBUSB_ERROR_OTHER;
- }
-
- return 0;
-}
-
-static int op_kernel_driver_active(struct libusb_device_handle *handle,
- int interface)
-{
- int fd = __device_handle_priv(handle)->fd;
- struct usbfs_getdriver getdrv;
- int r;
-
- getdrv.interface = interface;
- r = ioctl(fd, IOCTL_USBFS_GETDRIVER, &getdrv);
- if (r) {
- if (errno == ENODATA)
- return 0;
- else if (errno == ENODEV)
- return LIBUSB_ERROR_NO_DEVICE;
-
- usbi_err(HANDLE_CTX(handle),
- "get driver failed error %d errno %d", r, errno);
- return LIBUSB_ERROR_OTHER;
- }
-
- return 1;
-}
-
-static int op_detach_kernel_driver(struct libusb_device_handle *handle,
- int interface)
-{
- int fd = __device_handle_priv(handle)->fd;
- struct usbfs_ioctl command;
- int r;
-
- command.ifno = interface;
- command.ioctl_code = IOCTL_USBFS_DISCONNECT;
- command.data = NULL;
-
- r = ioctl(fd, IOCTL_USBFS_IOCTL, &command);
- if (r) {
- if (errno == ENODATA)
- return LIBUSB_ERROR_NOT_FOUND;
- else if (errno == EINVAL)
- return LIBUSB_ERROR_INVALID_PARAM;
- else if (errno == ENODEV)
- return LIBUSB_ERROR_NO_DEVICE;
-
- usbi_err(HANDLE_CTX(handle),
- "detach failed error %d errno %d", r, errno);
- return LIBUSB_ERROR_OTHER;
- }
-
- return 0;
-}
-
-static int op_attach_kernel_driver(struct libusb_device_handle *handle,
- int interface)
-{
- int fd = __device_handle_priv(handle)->fd;
- struct usbfs_ioctl command;
- int r;
-
- command.ifno = interface;
- command.ioctl_code = IOCTL_USBFS_CONNECT;
- command.data = NULL;
-
- r = ioctl(fd, IOCTL_USBFS_IOCTL, &command);
- if (r < 0) {
- if (errno == ENODATA)
- return LIBUSB_ERROR_NOT_FOUND;
- else if (errno == EINVAL)
- return LIBUSB_ERROR_INVALID_PARAM;
- else if (errno == ENODEV)
- return LIBUSB_ERROR_NO_DEVICE;
- else if (errno == EBUSY)
- return LIBUSB_ERROR_BUSY;
-
- usbi_err(HANDLE_CTX(handle),
- "attach failed error %d errno %d", r, errno);
- return LIBUSB_ERROR_OTHER;
- } else if (r == 0) {
- return LIBUSB_ERROR_NOT_FOUND;
- }
-
- return 0;
-}
-
-static void op_destroy_device(struct libusb_device *dev)
-{
- struct linux_device_priv *priv = __device_priv(dev);
- if (!sysfs_has_descriptors) {
- if (priv->dev_descriptor)
- free(priv->dev_descriptor);
- if (priv->config_descriptor)
- free(priv->config_descriptor);
- }
- if (priv->sysfs_dir)
- free(priv->sysfs_dir);
-}
-
-static void free_iso_urbs(struct linux_transfer_priv *tpriv)
-{
- int i;
- for (i = 0; i < tpriv->num_urbs; i++) {
- struct usbfs_urb *urb = tpriv->iso_urbs[i];
- if (!urb)
- break;
- free(urb);
- }
-
- free(tpriv->iso_urbs);
- tpriv->iso_urbs = NULL;
-}
-
-static int submit_bulk_transfer(struct usbi_transfer *itransfer,
- unsigned char urb_type)
-{
- struct libusb_transfer *transfer =
- __USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
- struct linux_transfer_priv *tpriv = usbi_transfer_get_os_priv(itransfer);
- struct linux_device_handle_priv *dpriv =
- __device_handle_priv(transfer->dev_handle);
- struct usbfs_urb *urbs;
- int is_out = (transfer->endpoint & LIBUSB_ENDPOINT_DIR_MASK)
- == LIBUSB_ENDPOINT_OUT;
- int r;
- int i;
- size_t alloc_size;
-
- if (tpriv->urbs)
- return LIBUSB_ERROR_BUSY;
-
- /* usbfs places a 16kb limit on bulk URBs. we divide up larger requests
- * into smaller units to meet such restriction, then fire off all the
- * units at once. it would be simpler if we just fired one unit at a time,
- * but there is a big performance gain through doing it this way. */
- int num_urbs = transfer->length / MAX_BULK_BUFFER_LENGTH;
- int last_urb_partial = 0;
-
- if (transfer->length == 0) {
- num_urbs = 1;
- } else if ((transfer->length % MAX_BULK_BUFFER_LENGTH) > 0) {
- last_urb_partial = 1;
- num_urbs++;
- }
- usbi_dbg("need %d urbs for new transfer with length %d", num_urbs,
- transfer->length);
- alloc_size = num_urbs * sizeof(struct usbfs_urb);
- urbs = malloc(alloc_size);
- if (!urbs)
- return LIBUSB_ERROR_NO_MEM;
- memset(urbs, 0, alloc_size);
- tpriv->urbs = urbs;
- tpriv->num_urbs = num_urbs;
- tpriv->num_retired = 0;
- tpriv->reap_action = NORMAL;
- tpriv->reap_status = LIBUSB_TRANSFER_COMPLETED;
-
- for (i = 0; i < num_urbs; i++) {
- struct usbfs_urb *urb = &urbs[i];
- urb->usercontext = itransfer;
- urb->type = urb_type;
- urb->endpoint = transfer->endpoint;
- urb->buffer = transfer->buffer + (i * MAX_BULK_BUFFER_LENGTH);
- if (supports_flag_bulk_continuation && !is_out)
- urb->flags = USBFS_URB_SHORT_NOT_OK;
- if (i == num_urbs - 1 && last_urb_partial)
- urb->buffer_length = transfer->length % MAX_BULK_BUFFER_LENGTH;
- else if (transfer->length == 0)
- urb->buffer_length = 0;
- else
- urb->buffer_length = MAX_BULK_BUFFER_LENGTH;
-
- if (i > 0 && supports_flag_bulk_continuation)
- urb->flags |= USBFS_URB_BULK_CONTINUATION;
-
- r = ioctl(dpriv->fd, IOCTL_USBFS_SUBMITURB, urb);
- if (r < 0) {
- int j;
-
- if (errno == ENODEV) {
- r = LIBUSB_ERROR_NO_DEVICE;
- } else {
- usbi_err(TRANSFER_CTX(transfer),
- "submiturb failed error %d errno=%d", r, errno);
- r = LIBUSB_ERROR_IO;
- }
-
- /* if the first URB submission fails, we can simply free up and
- * return failure immediately. */
- if (i == 0) {
- usbi_dbg("first URB failed, easy peasy");
- free(urbs);
- tpriv->urbs = NULL;
- return r;
- }
-
- /* if it's not the first URB that failed, the situation is a bit
- * tricky. we may need to discard all previous URBs. there are
- * complications:
- * - discarding is asynchronous - discarded urbs will be reaped
- * later. the user must not have freed the transfer when the
- * discarded URBs are reaped, otherwise libusb will be using
- * freed memory.
- * - the earlier URBs may have completed successfully and we do
- * not want to throw away any data.
- * - this URB failing may be no error; EREMOTEIO means that
- * this transfer simply didn't need all the URBs we submitted
- * so, we report that the transfer was submitted successfully and
- * in case of error we discard all previous URBs. later when
- * the final reap completes we can report error to the user,
- * or success if an earlier URB was completed successfully.
- */
- tpriv->reap_action = EREMOTEIO == errno ? COMPLETED_EARLY : SUBMIT_FAILED;
-
- /* The URBs we haven't submitted yet we count as already
- * retired. */
- tpriv->num_retired += num_urbs - i;
-
- /* If we completed short then don't try to discard. */
- if (COMPLETED_EARLY == tpriv->reap_action)
- return 0;
-
- for (j = 0; j < i; j++) {
- int tmp = ioctl(dpriv->fd, IOCTL_USBFS_DISCARDURB, &urbs[j]);
- if (tmp && errno != EINVAL)
- usbi_warn(TRANSFER_CTX(transfer),
- "unrecognised discard errno %d", errno);
- }
-
- usbi_dbg("reporting successful submission but waiting for %d "
- "discards before reporting error", i);
- return 0;
- }
- }
-
- return 0;
-}
-
-static int submit_iso_transfer(struct usbi_transfer *itransfer)
-{
- struct libusb_transfer *transfer =
- __USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
- struct linux_transfer_priv *tpriv = usbi_transfer_get_os_priv(itransfer);
- struct linux_device_handle_priv *dpriv =
- __device_handle_priv(transfer->dev_handle);
- struct usbfs_urb **urbs;
- size_t alloc_size;
- int num_packets = transfer->num_iso_packets;
- int i;
- int this_urb_len = 0;
- int num_urbs = 1;
- int packet_offset = 0;
- unsigned int packet_len;
- unsigned char *urb_buffer = transfer->buffer;
-
- if (tpriv->iso_urbs)
- return LIBUSB_ERROR_BUSY;
-
- /* usbfs places a 32kb limit on iso URBs. we divide up larger requests
- * into smaller units to meet such restriction, then fire off all the
- * units at once. it would be simpler if we just fired one unit at a time,
- * but there is a big performance gain through doing it this way. */
-
- /* calculate how many URBs we need */
- for (i = 0; i < num_packets; i++) {
- int space_remaining = MAX_ISO_BUFFER_LENGTH - this_urb_len;
- packet_len = transfer->iso_packet_desc[i].length;
-
- if (packet_len > space_remaining) {
- num_urbs++;
- this_urb_len = packet_len;
- } else {
- this_urb_len += packet_len;
- }
- }
- usbi_dbg("need %d 32k URBs for transfer", num_urbs);
-
- alloc_size = num_urbs * sizeof(*urbs);
- urbs = malloc(alloc_size);
- if (!urbs)
- return LIBUSB_ERROR_NO_MEM;
- memset(urbs, 0, alloc_size);
-
- tpriv->iso_urbs = urbs;
- tpriv->num_urbs = num_urbs;
- tpriv->num_retired = 0;
- tpriv->reap_action = NORMAL;
- tpriv->iso_packet_offset = 0;
-
- /* allocate + initialize each URB with the correct number of packets */
- for (i = 0; i < num_urbs; i++) {
- struct usbfs_urb *urb;
- int space_remaining_in_urb = MAX_ISO_BUFFER_LENGTH;
- int urb_packet_offset = 0;
- unsigned char *urb_buffer_orig = urb_buffer;
- int j;
- int k;
-
- /* swallow up all the packets we can fit into this URB */
- while (packet_offset < transfer->num_iso_packets) {
- packet_len = transfer->iso_packet_desc[packet_offset].length;
- if (packet_len <= space_remaining_in_urb) {
- /* throw it in */
- urb_packet_offset++;
- packet_offset++;
- space_remaining_in_urb -= packet_len;
- urb_buffer += packet_len;
- } else {
- /* it can't fit, save it for the next URB */
- break;
- }
- }
-
- alloc_size = sizeof(*urb)
- + (urb_packet_offset * sizeof(struct usbfs_iso_packet_desc));
- urb = malloc(alloc_size);
- if (!urb) {
- free_iso_urbs(tpriv);
- return LIBUSB_ERROR_NO_MEM;
- }
- memset(urb, 0, alloc_size);
- urbs[i] = urb;
-
- /* populate packet lengths */
- for (j = 0, k = packet_offset - urb_packet_offset;
- k < packet_offset; k++, j++) {
- packet_len = transfer->iso_packet_desc[k].length;
- urb->iso_frame_desc[j].length = packet_len;
- }
-
- urb->usercontext = itransfer;
- urb->type = USBFS_URB_TYPE_ISO;
- /* FIXME: interface for non-ASAP data? */
- urb->flags = USBFS_URB_ISO_ASAP;
- urb->endpoint = transfer->endpoint;
- urb->number_of_packets = urb_packet_offset;
- urb->buffer = urb_buffer_orig;
- }
-
- /* submit URBs */
- for (i = 0; i < num_urbs; i++) {
- int r = ioctl(dpriv->fd, IOCTL_USBFS_SUBMITURB, urbs[i]);
- if (r < 0) {
- int j;
-
- if (errno == ENODEV) {
- r = LIBUSB_ERROR_NO_DEVICE;
- } else {
- usbi_err(TRANSFER_CTX(transfer),
- "submiturb failed error %d errno=%d", r, errno);
- r = LIBUSB_ERROR_IO;
- }
-
- /* if the first URB submission fails, we can simply free up and
- * return failure immediately. */
- if (i == 0) {
- usbi_dbg("first URB failed, easy peasy");
- free_iso_urbs(tpriv);
- return r;
- }
-
- /* if it's not the first URB that failed, the situation is a bit
- * tricky. we must discard all previous URBs. there are
- * complications:
- * - discarding is asynchronous - discarded urbs will be reaped
- * later. the user must not have freed the transfer when the
- * discarded URBs are reaped, otherwise libusb will be using
- * freed memory.
- * - the earlier URBs may have completed successfully and we do
- * not want to throw away any data.
- * so, in this case we discard all the previous URBs BUT we report
- * that the transfer was submitted successfully. then later when
- * the final discard completes we can report error to the user.
- */
- tpriv->reap_action = SUBMIT_FAILED;
-
- /* The URBs we haven't submitted yet we count as already
- * retired. */
- tpriv->num_retired = num_urbs - i;
- for (j = 0; j < i; j++) {
- int tmp = ioctl(dpriv->fd, IOCTL_USBFS_DISCARDURB, urbs[j]);
- if (tmp && errno != EINVAL)
- usbi_warn(TRANSFER_CTX(transfer),
- "unrecognised discard errno %d", errno);
- }
-
- usbi_dbg("reporting successful submission but waiting for %d "
- "discards before reporting error", i);
- return 0;
- }
- }
-
- return 0;
-}
-
-static int submit_control_transfer(struct usbi_transfer *itransfer)
-{
- struct linux_transfer_priv *tpriv = usbi_transfer_get_os_priv(itransfer);
- struct libusb_transfer *transfer =
- __USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
- struct linux_device_handle_priv *dpriv =
- __device_handle_priv(transfer->dev_handle);
- struct usbfs_urb *urb;
- int r;
-
- if (tpriv->urbs)
- return LIBUSB_ERROR_BUSY;
-
- if (transfer->length - LIBUSB_CONTROL_SETUP_SIZE > MAX_CTRL_BUFFER_LENGTH)
- return LIBUSB_ERROR_INVALID_PARAM;
-
- urb = malloc(sizeof(struct usbfs_urb));
- if (!urb)
- return LIBUSB_ERROR_NO_MEM;
- memset(urb, 0, sizeof(struct usbfs_urb));
- tpriv->urbs = urb;
- tpriv->reap_action = NORMAL;
-
- urb->usercontext = itransfer;
- urb->type = USBFS_URB_TYPE_CONTROL;
- urb->endpoint = transfer->endpoint;
- urb->buffer = transfer->buffer;
- urb->buffer_length = transfer->length;
-
- r = ioctl(dpriv->fd, IOCTL_USBFS_SUBMITURB, urb);
- if (r < 0) {
- free(urb);
- tpriv->urbs = NULL;
- if (errno == ENODEV)
- return LIBUSB_ERROR_NO_DEVICE;
-
- usbi_err(TRANSFER_CTX(transfer),
- "submiturb failed error %d errno=%d", r, errno);
- return LIBUSB_ERROR_IO;
- }
- return 0;
-}
-
-static int op_submit_transfer(struct usbi_transfer *itransfer)
-{
- struct libusb_transfer *transfer =
- __USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
-
- switch (transfer->type) {
- case LIBUSB_TRANSFER_TYPE_CONTROL:
- return submit_control_transfer(itransfer);
- case LIBUSB_TRANSFER_TYPE_BULK:
- return submit_bulk_transfer(itransfer, USBFS_URB_TYPE_BULK);
- case LIBUSB_TRANSFER_TYPE_INTERRUPT:
- return submit_bulk_transfer(itransfer, USBFS_URB_TYPE_INTERRUPT);
- case LIBUSB_TRANSFER_TYPE_ISOCHRONOUS:
- return submit_iso_transfer(itransfer);
- default:
- usbi_err(TRANSFER_CTX(transfer),
- "unknown endpoint type %d", transfer->type);
- return LIBUSB_ERROR_INVALID_PARAM;
- }
-}
-
-static int cancel_control_transfer(struct usbi_transfer *itransfer)
-{
- struct linux_transfer_priv *tpriv = usbi_transfer_get_os_priv(itransfer);
- struct libusb_transfer *transfer =
- __USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
- struct linux_device_handle_priv *dpriv =
- __device_handle_priv(transfer->dev_handle);
- int r;
-
- if (!tpriv->urbs)
- return LIBUSB_ERROR_NOT_FOUND;
-
- tpriv->reap_action = CANCELLED;
- r = ioctl(dpriv->fd, IOCTL_USBFS_DISCARDURB, tpriv->urbs);
- if(r) {
- if (errno == EINVAL) {
- usbi_dbg("URB not found --> assuming ready to be reaped");
- return 0;
- } else {
- usbi_err(TRANSFER_CTX(transfer),
- "unrecognised DISCARD code %d", errno);
- return LIBUSB_ERROR_OTHER;
- }
- }
-
- return 0;
-}
-
-static int cancel_bulk_transfer(struct usbi_transfer *itransfer)
-{
- struct linux_transfer_priv *tpriv = usbi_transfer_get_os_priv(itransfer);
- struct libusb_transfer *transfer =
- __USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
- struct linux_device_handle_priv *dpriv =
- __device_handle_priv(transfer->dev_handle);
- int i;
-
- if (!tpriv->urbs)
- return LIBUSB_ERROR_NOT_FOUND;
-
- if (tpriv->reap_action != ERROR)
- tpriv->reap_action = CANCELLED;
-
- for (i = 0; i < tpriv->num_urbs; i++) {
- int tmp = ioctl(dpriv->fd, IOCTL_USBFS_DISCARDURB, &tpriv->urbs[i]);
- if (tmp && errno != EINVAL)
- usbi_warn(TRANSFER_CTX(transfer),
- "unrecognised discard errno %d", errno);
- }
- return 0;
-}
-
-static int cancel_iso_transfer(struct usbi_transfer *itransfer)
-{
- struct linux_transfer_priv *tpriv = usbi_transfer_get_os_priv(itransfer);
- struct libusb_transfer *transfer =
- __USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
- struct linux_device_handle_priv *dpriv =
- __device_handle_priv(transfer->dev_handle);
- int i;
-
- if (!tpriv->iso_urbs)
- return LIBUSB_ERROR_NOT_FOUND;
-
- tpriv->reap_action = CANCELLED;
- for (i = 0; i < tpriv->num_urbs; i++) {
- int tmp = ioctl(dpriv->fd, IOCTL_USBFS_DISCARDURB, tpriv->iso_urbs[i]);
- if (tmp && errno != EINVAL)
- usbi_warn(TRANSFER_CTX(transfer),
- "unrecognised discard errno %d", errno);
- }
- return 0;
-}
-
-static int op_cancel_transfer(struct usbi_transfer *itransfer)
-{
- struct libusb_transfer *transfer =
- __USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
-
- switch (transfer->type) {
- case LIBUSB_TRANSFER_TYPE_CONTROL:
- return cancel_control_transfer(itransfer);
- case LIBUSB_TRANSFER_TYPE_BULK:
- case LIBUSB_TRANSFER_TYPE_INTERRUPT:
- return cancel_bulk_transfer(itransfer);
- case LIBUSB_TRANSFER_TYPE_ISOCHRONOUS:
- return cancel_iso_transfer(itransfer);
- default:
- usbi_err(TRANSFER_CTX(transfer),
- "unknown endpoint type %d", transfer->type);
- return LIBUSB_ERROR_INVALID_PARAM;
- }
-}
-
-static void op_clear_transfer_priv(struct usbi_transfer *itransfer)
-{
- struct libusb_transfer *transfer =
- __USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
- struct linux_transfer_priv *tpriv = usbi_transfer_get_os_priv(itransfer);
-
- switch (transfer->type) {
- case LIBUSB_TRANSFER_TYPE_CONTROL:
- case LIBUSB_TRANSFER_TYPE_BULK:
- case LIBUSB_TRANSFER_TYPE_INTERRUPT:
- free(tpriv->urbs);
- tpriv->urbs = NULL;
- break;
- case LIBUSB_TRANSFER_TYPE_ISOCHRONOUS:
- free_iso_urbs(tpriv);
- break;
- default:
- usbi_err(TRANSFER_CTX(transfer),
- "unknown endpoint type %d", transfer->type);
- }
-}
-
-static int handle_bulk_completion(struct usbi_transfer *itransfer,
- struct usbfs_urb *urb)
-{
- struct linux_transfer_priv *tpriv = usbi_transfer_get_os_priv(itransfer);
- struct libusb_transfer *transfer = __USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
- struct linux_device_handle_priv *dpriv = __device_handle_priv(transfer->dev_handle);
- int urb_idx = urb - tpriv->urbs;
-
- usbi_mutex_lock(&itransfer->lock);
- usbi_dbg("handling completion status %d of bulk urb %d/%d", urb->status,
- urb_idx + 1, tpriv->num_urbs);
-
- tpriv->num_retired++;
-
- if (tpriv->reap_action != NORMAL) {
- /* cancelled, submit_fail, or completed early */
- usbi_dbg("abnormal reap: urb status %d", urb->status);
-
- /* even though we're in the process of cancelling, it's possible that
- * we may receive some data in these URBs that we don't want to lose.
- * examples:
- * 1. while the kernel is cancelling all the packets that make up an
- * URB, a few of them might complete. so we get back a successful
- * cancellation *and* some data.
- * 2. we receive a short URB which marks the early completion condition,
- * so we start cancelling the remaining URBs. however, we're too
- * slow and another URB completes (or at least completes partially).
- *
- * When this happens, our objectives are not to lose any "surplus" data,
- * and also to stick it at the end of the previously-received data
- * (closing any holes), so that libusb reports the total amount of
- * transferred data and presents it in a contiguous chunk.
- */
- if (urb->actual_length > 0) {
- unsigned char *target = transfer->buffer + itransfer->transferred;
- usbi_dbg("received %d bytes of surplus data", urb->actual_length);
- if (urb->buffer != target) {
- usbi_dbg("moving surplus data from offset %d to offset %d",
- (unsigned char *) urb->buffer - transfer->buffer,
- target - transfer->buffer);
- memmove(target, urb->buffer, urb->actual_length);
- }
- itransfer->transferred += urb->actual_length;
- }
-
- if (tpriv->num_retired == tpriv->num_urbs) {
- usbi_dbg("abnormal reap: last URB handled, reporting");
- if (tpriv->reap_action != COMPLETED_EARLY &&
- tpriv->reap_status == LIBUSB_TRANSFER_COMPLETED)
- tpriv->reap_status = LIBUSB_TRANSFER_ERROR;
- goto completed;
- }
- goto out_unlock;
- }
-
- if (urb->status == 0 || urb->status == -EREMOTEIO ||
- (urb->status == -EOVERFLOW && urb->actual_length > 0))
- itransfer->transferred += urb->actual_length;
-
-
- switch (urb->status) {
- case 0:
- break;
- case -EREMOTEIO: /* short transfer */
- break;
- case -EPIPE:
- usbi_dbg("detected endpoint stall");
- if (tpriv->reap_status == LIBUSB_TRANSFER_COMPLETED)
- tpriv->reap_status = LIBUSB_TRANSFER_STALL;
- goto cancel_remaining;
- case -EOVERFLOW:
- /* overflow can only ever occur in the last urb */
- usbi_dbg("overflow, actual_length=%d", urb->actual_length);
- if (tpriv->reap_status == LIBUSB_TRANSFER_COMPLETED)
- tpriv->reap_status = LIBUSB_TRANSFER_OVERFLOW;
- goto completed;
- case -ETIME:
- case -EPROTO:
- case -EILSEQ:
- /* These can happen on *any* urb of a multi-urb transfer, so
- * save a status and tear down rest of the transfer */
- usbi_dbg("low level error %d", urb->status);
- tpriv->reap_action = ERROR;
- if (tpriv->reap_status == LIBUSB_TRANSFER_COMPLETED)
- tpriv->reap_status = LIBUSB_TRANSFER_ERROR;
- goto cancel_remaining;
- default:
- usbi_warn(ITRANSFER_CTX(itransfer),
- "unrecognised urb status %d", urb->status);
- if (tpriv->reap_status == LIBUSB_TRANSFER_COMPLETED)
- tpriv->reap_status = LIBUSB_TRANSFER_ERROR;
- goto cancel_remaining;
- }
-
- /* if we're the last urb or we got less data than requested then we're
- * done */
- if (urb_idx == tpriv->num_urbs - 1) {
- usbi_dbg("last URB in transfer --> complete!");
- goto completed;
- } else if (urb->actual_length < urb->buffer_length) {
- usbi_dbg("short transfer %d/%d --> complete!",
- urb->actual_length, urb->buffer_length);
- if (tpriv->reap_action == NORMAL)
- tpriv->reap_action = COMPLETED_EARLY;
- } else
- goto out_unlock;
-
-cancel_remaining:
- if (tpriv->num_retired == tpriv->num_urbs) /* nothing to cancel */
- goto completed;
-
- /* cancel remaining urbs and wait for their completion before
- * reporting results */
- while (++urb_idx < tpriv->num_urbs) {
- /* remaining URBs with continuation flag are
- * automatically cancelled by the kernel */
- if (tpriv->urbs[urb_idx].flags & USBFS_URB_BULK_CONTINUATION)
- continue;
- int tmp = ioctl(dpriv->fd, IOCTL_USBFS_DISCARDURB, &tpriv->urbs[urb_idx]);
- if (tmp && errno != EINVAL)
- usbi_warn(TRANSFER_CTX(transfer),
- "unrecognised discard errno %d", errno);
- }
-
-out_unlock:
- usbi_mutex_unlock(&itransfer->lock);
- return 0;
-
-completed:
- free(tpriv->urbs);
- tpriv->urbs = NULL;
- usbi_mutex_unlock(&itransfer->lock);
- return CANCELLED == tpriv->reap_action ?
- usbi_handle_transfer_cancellation(itransfer) :
- usbi_handle_transfer_completion(itransfer, tpriv->reap_status);
-}
-
-static int handle_iso_completion(struct usbi_transfer *itransfer,
- struct usbfs_urb *urb)
-{
- struct libusb_transfer *transfer =
- __USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
- struct linux_transfer_priv *tpriv = usbi_transfer_get_os_priv(itransfer);
- int num_urbs = tpriv->num_urbs;
- int urb_idx = 0;
- int i;
-
- usbi_mutex_lock(&itransfer->lock);
- for (i = 0; i < num_urbs; i++) {
- if (urb == tpriv->iso_urbs[i]) {
- urb_idx = i + 1;
- break;
- }
- }
- if (urb_idx == 0) {
- usbi_err(TRANSFER_CTX(transfer), "could not locate urb!");
- usbi_mutex_unlock(&itransfer->lock);
- return LIBUSB_ERROR_NOT_FOUND;
- }
-
- usbi_dbg("handling completion status %d of iso urb %d/%d", urb->status,
- urb_idx, num_urbs);
-
- if (urb->status == 0) {
- /* copy isochronous results back in */
-
- for (i = 0; i < urb->number_of_packets; i++) {
- struct usbfs_iso_packet_desc *urb_desc = &urb->iso_frame_desc[i];
- struct libusb_iso_packet_descriptor *lib_desc =
- &transfer->iso_packet_desc[tpriv->iso_packet_offset++];
- lib_desc->status = urb_desc->status;
- lib_desc->actual_length = urb_desc->actual_length;
- }
- }
-
- tpriv->num_retired++;
-
- if (tpriv->reap_action != NORMAL) { /* cancelled or submit_fail */
- usbi_dbg("CANCEL: urb status %d", urb->status);
-
- if (tpriv->num_retired == num_urbs) {
- usbi_dbg("CANCEL: last URB handled, reporting");
- free_iso_urbs(tpriv);
- if (tpriv->reap_action == CANCELLED) {
- usbi_mutex_unlock(&itransfer->lock);
- return usbi_handle_transfer_cancellation(itransfer);
- } else {
- usbi_mutex_unlock(&itransfer->lock);
- return usbi_handle_transfer_completion(itransfer,
- LIBUSB_TRANSFER_ERROR);
- }
- }
- goto out;
- }
-
- switch (urb->status) {
- case 0:
- break;
- case -ETIME:
- case -EPROTO:
- case -EILSEQ:
- usbi_dbg("low-level USB error %d", urb->status);
- break;
- default:
- usbi_warn(TRANSFER_CTX(transfer),
- "unrecognised urb status %d", urb->status);
- break;
- }
-
- /* if we're the last urb or we got less data than requested then we're
- * done */
- if (urb_idx == num_urbs) {
- usbi_dbg("last URB in transfer --> complete!");
- free_iso_urbs(tpriv);
- usbi_mutex_unlock(&itransfer->lock);
- return usbi_handle_transfer_completion(itransfer, LIBUSB_TRANSFER_COMPLETED);
- }
-
-out:
- usbi_mutex_unlock(&itransfer->lock);
- return 0;
-}
-
-static int handle_control_completion(struct usbi_transfer *itransfer,
- struct usbfs_urb *urb)
-{
- struct linux_transfer_priv *tpriv = usbi_transfer_get_os_priv(itransfer);
- int status;
-
- usbi_mutex_lock(&itransfer->lock);
- usbi_dbg("handling completion status %d", urb->status);
-
- if (urb->status == 0)
- itransfer->transferred += urb->actual_length;
-
- if (tpriv->reap_action == CANCELLED) {
- if (urb->status != 0 && urb->status != -ENOENT)
- usbi_warn(ITRANSFER_CTX(itransfer),
- "cancel: unrecognised urb status %d", urb->status);
- free(tpriv->urbs);
- tpriv->urbs = NULL;
- usbi_mutex_unlock(&itransfer->lock);
- return usbi_handle_transfer_cancellation(itransfer);
- }
-
- switch (urb->status) {
- case 0:
- itransfer->transferred = urb->actual_length;
- status = LIBUSB_TRANSFER_COMPLETED;
- break;
- case -EPIPE:
- usbi_dbg("unsupported control request");
- status = LIBUSB_TRANSFER_STALL;
- break;
- case -ETIME:
- case -EPROTO:
- case -EILSEQ:
- usbi_dbg("low-level bus error occurred");
- status = LIBUSB_TRANSFER_ERROR;
- break;
- default:
- usbi_warn(ITRANSFER_CTX(itransfer),
- "unrecognised urb status %d", urb->status);
- status = LIBUSB_TRANSFER_ERROR;
- break;
- }
-
- free(tpriv->urbs);
- tpriv->urbs = NULL;
- usbi_mutex_unlock(&itransfer->lock);
- return usbi_handle_transfer_completion(itransfer, status);
-}
-
-static int reap_for_handle(struct libusb_device_handle *handle)
-{
- struct linux_device_handle_priv *hpriv = __device_handle_priv(handle);
- int r;
- struct usbfs_urb *urb;
- struct usbi_transfer *itransfer;
- struct libusb_transfer *transfer;
-
- r = ioctl(hpriv->fd, IOCTL_USBFS_REAPURBNDELAY, &urb);
- if (r == -1 && errno == EAGAIN)
- return 1;
- if (r < 0) {
- if (errno == ENODEV)
- return LIBUSB_ERROR_NO_DEVICE;
-
- usbi_err(HANDLE_CTX(handle), "reap failed error %d errno=%d",
- r, errno);
- return LIBUSB_ERROR_IO;
- }
-
- itransfer = urb->usercontext;
- transfer = __USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
-
- usbi_dbg("urb type=%d status=%d transferred=%d", urb->type, urb->status,
- urb->actual_length);
-
- switch (transfer->type) {
- case LIBUSB_TRANSFER_TYPE_ISOCHRONOUS:
- return handle_iso_completion(itransfer, urb);
- case LIBUSB_TRANSFER_TYPE_BULK:
- case LIBUSB_TRANSFER_TYPE_INTERRUPT:
- return handle_bulk_completion(itransfer, urb);
- case LIBUSB_TRANSFER_TYPE_CONTROL:
- return handle_control_completion(itransfer, urb);
- default:
- usbi_err(HANDLE_CTX(handle), "unrecognised endpoint type %x",
- transfer->type);
- return LIBUSB_ERROR_OTHER;
- }
-}
-
-static int op_handle_events(struct libusb_context *ctx,
- struct pollfd *fds, nfds_t nfds, int num_ready)
-{
- int r;
- int i = 0;
-
- usbi_mutex_lock(&ctx->open_devs_lock);
- for (i = 0; i < nfds && num_ready > 0; i++) {
- struct pollfd *pollfd = &fds[i];
- struct libusb_device_handle *handle;
- struct linux_device_handle_priv *hpriv = NULL;
-
- if (!pollfd->revents)
- continue;
-
- num_ready--;
- list_for_each_entry(handle, &ctx->open_devs, list, struct libusb_device_handle) {
- hpriv = __device_handle_priv(handle);
- if (hpriv->fd == pollfd->fd)
- break;
- }
-
- if (pollfd->revents & POLLERR) {
- usbi_remove_pollfd(HANDLE_CTX(handle), hpriv->fd);
- usbi_handle_disconnect(handle);
- continue;
- }
-
- r = reap_for_handle(handle);
- if (r == 1 || r == LIBUSB_ERROR_NO_DEVICE)
- continue;
- else if (r < 0)
- goto out;
- }
-
- r = 0;
-out:
- usbi_mutex_unlock(&ctx->open_devs_lock);
- return r;
-}
-
-static int op_clock_gettime(int clk_id, struct timespec *tp)
-{
- switch (clk_id) {
- case USBI_CLOCK_MONOTONIC:
- return clock_gettime(monotonic_clkid, tp);
- case USBI_CLOCK_REALTIME:
- return clock_gettime(CLOCK_REALTIME, tp);
- default:
- return LIBUSB_ERROR_INVALID_PARAM;
- }
-}
-
-#ifdef USBI_TIMERFD_AVAILABLE
-static clockid_t op_get_timerfd_clockid(void)
-{
- return monotonic_clkid;
-
-}
-#endif
-
-const struct usbi_os_backend linux_usbfs_backend = {
- .name = "Linux usbfs",
- .init = op_init,
- .exit = NULL,
- .get_device_list = op_get_device_list,
- .get_device_descriptor = op_get_device_descriptor,
- .get_active_config_descriptor = op_get_active_config_descriptor,
- .get_config_descriptor = op_get_config_descriptor,
-
- .open = op_open,
- .close = op_close,
- .get_configuration = op_get_configuration,
- .set_configuration = op_set_configuration,
- .claim_interface = op_claim_interface,
- .release_interface = op_release_interface,
-
- .set_interface_altsetting = op_set_interface,
- .clear_halt = op_clear_halt,
- .reset_device = op_reset_device,
-
- .kernel_driver_active = op_kernel_driver_active,
- .detach_kernel_driver = op_detach_kernel_driver,
- .attach_kernel_driver = op_attach_kernel_driver,
-
- .destroy_device = op_destroy_device,
-
- .submit_transfer = op_submit_transfer,
- .cancel_transfer = op_cancel_transfer,
- .clear_transfer_priv = op_clear_transfer_priv,
-
- .handle_events = op_handle_events,
-
- .clock_gettime = op_clock_gettime,
-
-#ifdef USBI_TIMERFD_AVAILABLE
- .get_timerfd_clockid = op_get_timerfd_clockid,
-#endif
-
- .device_priv_size = sizeof(struct linux_device_priv),
- .device_handle_priv_size = sizeof(struct linux_device_handle_priv),
- .transfer_priv_size = sizeof(struct linux_transfer_priv),
- .add_iso_packet_size = 0,
-};
-