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2605 lines
71 KiB
2605 lines
71 KiB
/* -*- Mode: C; c-basic-offset:8 ; indent-tabs-mode:t -*- */ |
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/* |
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* Linux usbfs backend for libusb |
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* Copyright (C) 2007-2009 Daniel Drake <dsd@gentoo.org> |
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* Copyright (c) 2001 Johannes Erdfelt <johannes@erdfelt.com> |
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* Copyright (c) 2013 Nathan Hjelm <hjelmn@mac.com> |
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* |
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* This library is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* This library is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with this library; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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|
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#include <config.h> |
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#include <ctype.h> |
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#include <dirent.h> |
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#include <errno.h> |
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#include <fcntl.h> |
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#include <poll.h> |
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#include <stdio.h> |
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#include <stdlib.h> |
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#include <string.h> |
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#include <sys/ioctl.h> |
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#include <sys/stat.h> |
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#include <sys/types.h> |
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#include <sys/utsname.h> |
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#include <unistd.h> |
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|
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#include "libusb.h" |
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#include "libusbi.h" |
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#include "linux_usbfs.h" |
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|
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/* sysfs vs usbfs: |
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* opening a usbfs node causes the device to be resumed, so we attempt to |
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* avoid this during enumeration. |
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* |
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* sysfs allows us to read the kernel's in-memory copies of device descriptors |
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* and so forth, avoiding the need to open the device: |
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* - The binary "descriptors" file was added in 2.6.23. |
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* - The "busnum" file was added in 2.6.22 |
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* - The "devnum" file has been present since pre-2.6.18 |
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* - the "bConfigurationValue" file has been present since pre-2.6.18 |
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* |
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* If we have bConfigurationValue, busnum, and devnum, then we can determine |
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* the active configuration without having to open the usbfs node in RDWR mode. |
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* We assume this is the case if we see the busnum file (indicates 2.6.22+). |
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* The busnum file is important as that is the only way we can relate sysfs |
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* devices to usbfs nodes. |
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* |
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* If we also have descriptors, we can obtain the device descriptor and active |
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* configuration without touching usbfs at all. |
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* |
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* The descriptors file originally only contained the active configuration |
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* descriptor alongside the device descriptor, but all configurations are |
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* included as of Linux 2.6.26. |
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*/ |
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|
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/* endianness for multi-byte fields: |
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* |
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* Descriptors exposed by usbfs have the multi-byte fields in the device |
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* descriptor as host endian. Multi-byte fields in the other descriptors are |
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* bus-endian. The kernel documentation says otherwise, but it is wrong. |
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*/ |
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|
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const char *usbfs_path = NULL; |
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|
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/* use usbdev*.* device names in /dev instead of the usbfs bus directories */ |
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static int usbdev_names = 0; |
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|
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/* Linux 2.6.32 adds support for a bulk continuation URB flag. this basically |
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* allows us to mark URBs as being part of a specific logical transfer when |
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* we submit them to the kernel. then, on any error except a cancellation, all |
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* URBs within that transfer will be cancelled and no more URBs will be |
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* accepted for the transfer, meaning that no more data can creep in. |
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* |
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* The BULK_CONTINUATION flag must be set on all URBs within a bulk transfer |
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* (in either direction) except the first. |
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* For IN transfers, we must also set SHORT_NOT_OK on all URBs except the |
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* last; it means that the kernel should treat a short reply as an error. |
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* For OUT transfers, SHORT_NOT_OK must not be set. it isn't needed (OUT |
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* transfers can't be short unless there's already some sort of error), and |
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* setting this flag is disallowed (a kernel with USB debugging enabled will |
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* reject such URBs). |
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*/ |
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static int supports_flag_bulk_continuation = -1; |
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|
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/* Linux 2.6.31 fixes support for the zero length packet URB flag. This |
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* allows us to mark URBs that should be followed by a zero length data |
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* packet, which can be required by device- or class-specific protocols. |
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*/ |
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static int supports_flag_zero_packet = -1; |
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|
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/* clock ID for monotonic clock, as not all clock sources are available on all |
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* systems. appropriate choice made at initialization time. */ |
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static clockid_t monotonic_clkid = -1; |
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|
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/* do we have a busnum to relate devices? this also implies that we can read |
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* the active configuration through bConfigurationValue */ |
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static int sysfs_can_relate_devices = 0; |
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|
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/* do we have a descriptors file? */ |
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static int sysfs_has_descriptors = 0; |
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|
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/* how many times have we initted (and not exited) ? */ |
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static volatile int init_count = 0; |
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|
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/* lock for init_count */ |
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static pthread_mutex_t hotplug_lock = PTHREAD_MUTEX_INITIALIZER; |
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|
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static int linux_start_event_monitor(void); |
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static int linux_stop_event_monitor(void); |
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static int linux_scan_devices(struct libusb_context *ctx); |
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|
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#if !defined(USE_UDEV) |
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static int linux_default_scan_devices (struct libusb_context *ctx); |
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#endif |
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struct linux_device_priv { |
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char *sysfs_dir; |
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unsigned char *dev_descriptor; |
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unsigned char *config_descriptor; |
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}; |
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struct linux_device_handle_priv { |
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int fd; |
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uint32_t caps; |
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}; |
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|
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enum reap_action { |
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NORMAL = 0, |
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/* submission failed after the first URB, so await cancellation/completion |
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* of all the others */ |
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SUBMIT_FAILED, |
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|
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/* cancelled by user or timeout */ |
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CANCELLED, |
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|
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/* completed multi-URB transfer in non-final URB */ |
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COMPLETED_EARLY, |
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|
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/* one or more urbs encountered a low-level error */ |
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ERROR, |
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}; |
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|
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struct linux_transfer_priv { |
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union { |
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struct usbfs_urb *urbs; |
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struct usbfs_urb **iso_urbs; |
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}; |
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|
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enum reap_action reap_action; |
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int num_urbs; |
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int num_retired; |
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enum libusb_transfer_status reap_status; |
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|
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/* next iso packet in user-supplied transfer to be populated */ |
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int iso_packet_offset; |
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}; |
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|
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static void _get_usbfs_path(struct libusb_device *dev, char *path) |
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{ |
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if (usbdev_names) |
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snprintf(path, PATH_MAX, "%s/usbdev%d.%d", |
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usbfs_path, dev->bus_number, dev->device_address); |
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else |
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snprintf(path, PATH_MAX, "%s/%03d/%03d", |
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usbfs_path, dev->bus_number, dev->device_address); |
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} |
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|
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static struct linux_device_priv *_device_priv(struct libusb_device *dev) |
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{ |
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return (struct linux_device_priv *) dev->os_priv; |
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} |
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|
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static struct linux_device_handle_priv *_device_handle_priv( |
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struct libusb_device_handle *handle) |
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{ |
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return (struct linux_device_handle_priv *) handle->os_priv; |
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} |
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|
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/* check dirent for a /dev/usbdev%d.%d name |
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* optionally return bus/device on success */ |
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static int _is_usbdev_entry(struct dirent *entry, int *bus_p, int *dev_p) |
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{ |
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int busnum, devnum; |
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|
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if (sscanf(entry->d_name, "usbdev%d.%d", &busnum, &devnum) != 2) |
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return 0; |
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usbi_dbg("found: %s", entry->d_name); |
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if (bus_p != NULL) |
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*bus_p = busnum; |
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if (dev_p != NULL) |
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*dev_p = devnum; |
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return 1; |
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} |
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|
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static int check_usb_vfs(const char *dirname) |
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{ |
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DIR *dir; |
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struct dirent *entry; |
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int found = 0; |
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|
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dir = opendir(dirname); |
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if (!dir) |
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return 0; |
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|
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while ((entry = readdir(dir)) != NULL) { |
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if (entry->d_name[0] == '.') |
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continue; |
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|
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/* We assume if we find any files that it must be the right place */ |
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found = 1; |
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break; |
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} |
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|
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closedir(dir); |
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return found; |
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} |
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|
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static const char *find_usbfs_path(void) |
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{ |
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const char *path = "/dev/bus/usb"; |
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const char *ret = NULL; |
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|
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if (check_usb_vfs(path)) { |
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ret = path; |
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} else { |
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path = "/proc/bus/usb"; |
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if (check_usb_vfs(path)) |
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ret = path; |
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} |
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|
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/* look for /dev/usbdev*.* if the normal places fail */ |
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if (ret == NULL) { |
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struct dirent *entry; |
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DIR *dir; |
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|
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path = "/dev"; |
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dir = opendir(path); |
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if (dir != NULL) { |
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while ((entry = readdir(dir)) != NULL) { |
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if (_is_usbdev_entry(entry, NULL, NULL)) { |
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/* found one; that's enough */ |
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ret = path; |
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usbdev_names = 1; |
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break; |
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} |
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} |
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closedir(dir); |
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} |
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} |
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if (ret != NULL) |
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usbi_dbg("found usbfs at %s", ret); |
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|
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return ret; |
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} |
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|
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/* the monotonic clock is not usable on all systems (e.g. embedded ones often |
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* seem to lack it). fall back to REALTIME if we have to. */ |
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static clockid_t find_monotonic_clock(void) |
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{ |
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#ifdef CLOCK_MONOTONIC |
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struct timespec ts; |
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int r; |
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|
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/* Linux 2.6.28 adds CLOCK_MONOTONIC_RAW but we don't use it |
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* because it's not available through timerfd */ |
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r = clock_gettime(CLOCK_MONOTONIC, &ts); |
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if (r == 0) |
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return CLOCK_MONOTONIC; |
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usbi_dbg("monotonic clock doesn't work, errno %d", errno); |
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#endif |
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|
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return CLOCK_REALTIME; |
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} |
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|
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static int kernel_version_ge(int major, int minor, int sublevel) |
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{ |
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struct utsname uts; |
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int atoms, kmajor, kminor, ksublevel; |
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|
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if (uname(&uts) < 0) |
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return -1; |
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atoms = sscanf(uts.release, "%d.%d.%d", &kmajor, &kminor, &ksublevel); |
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if (atoms < 1) |
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return -1; |
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|
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if (kmajor > major) |
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return 1; |
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if (kmajor < major) |
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return 0; |
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|
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/* kmajor == major */ |
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if (atoms < 2) |
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return 0 == minor && 0 == sublevel; |
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if (kminor > minor) |
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return 1; |
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if (kminor < minor) |
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return 0; |
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|
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/* kminor == minor */ |
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if (atoms < 3) |
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return 0 == sublevel; |
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|
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return ksublevel >= sublevel; |
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} |
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|
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/* Return 1 if filename exists inside dirname in sysfs. |
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SYSFS_DEVICE_PATH is assumed to be the beginning of the path. */ |
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static int sysfs_has_file(const char *dirname, const char *filename) |
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{ |
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struct stat statbuf; |
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char path[PATH_MAX]; |
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int r; |
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|
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snprintf(path, PATH_MAX, "%s/%s/%s", SYSFS_DEVICE_PATH, dirname, filename); |
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r = stat(path, &statbuf); |
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if (r == 0 && S_ISREG(statbuf.st_mode)) |
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return 1; |
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|
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return 0; |
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} |
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|
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static int op_init(struct libusb_context *ctx) |
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{ |
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struct stat statbuf; |
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int r; |
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usbfs_path = find_usbfs_path(); |
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if (!usbfs_path) { |
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usbi_err(ctx, "could not find usbfs"); |
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return LIBUSB_ERROR_OTHER; |
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} |
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|
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if (monotonic_clkid == -1) |
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monotonic_clkid = find_monotonic_clock(); |
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|
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if (supports_flag_bulk_continuation == -1) { |
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/* bulk continuation URB flag available from Linux 2.6.32 */ |
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supports_flag_bulk_continuation = kernel_version_ge(2,6,32); |
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if (supports_flag_bulk_continuation == -1) { |
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usbi_err(ctx, "error checking for bulk continuation support"); |
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return LIBUSB_ERROR_OTHER; |
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} |
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} |
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|
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if (supports_flag_bulk_continuation) |
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usbi_dbg("bulk continuation flag supported"); |
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|
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if (-1 == supports_flag_zero_packet) { |
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/* zero length packet URB flag fixed since Linux 2.6.31 */ |
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supports_flag_zero_packet = kernel_version_ge(2,6,31); |
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if (-1 == supports_flag_zero_packet) { |
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usbi_err(ctx, "error checking for zero length packet support"); |
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return LIBUSB_ERROR_OTHER; |
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} |
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} |
|
|
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if (supports_flag_zero_packet) |
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usbi_dbg("zero length packet flag supported"); |
|
|
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r = stat(SYSFS_DEVICE_PATH, &statbuf); |
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if (r == 0 && S_ISDIR(statbuf.st_mode)) { |
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DIR *devices = opendir(SYSFS_DEVICE_PATH); |
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struct dirent *entry; |
|
|
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usbi_dbg("found usb devices in sysfs"); |
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|
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if (!devices) { |
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usbi_err(ctx, "opendir devices failed errno=%d", errno); |
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return LIBUSB_ERROR_IO; |
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} |
|
|
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/* Make sure sysfs supports all the required files. If it |
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* does not, then usbfs will be used instead. Determine |
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* this by looping through the directories in |
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* SYSFS_DEVICE_PATH. With the assumption that there will |
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* always be subdirectories of the name usbN (usb1, usb2, |
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* etc) representing the root hubs, check the usbN |
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* subdirectories to see if they have all the needed files. |
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* This algorithm uses the usbN subdirectories (root hubs) |
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* because a device disconnection will cause a race |
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* condition regarding which files are available, sometimes |
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* causing an incorrect result. The root hubs are used |
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* because it is assumed that they will always be present. |
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* See the "sysfs vs usbfs" comment at the top of this file |
|
* for more details. */ |
|
while ((entry = readdir(devices))) { |
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int has_busnum=0, has_devnum=0, has_descriptors=0; |
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int has_configuration_value=0; |
|
|
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/* Only check the usbN directories. */ |
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if (strncmp(entry->d_name, "usb", 3) != 0) |
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continue; |
|
|
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/* Check for the files libusb needs from sysfs. */ |
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has_busnum = sysfs_has_file(entry->d_name, "busnum"); |
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has_devnum = sysfs_has_file(entry->d_name, "devnum"); |
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has_descriptors = sysfs_has_file(entry->d_name, "descriptors"); |
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has_configuration_value = sysfs_has_file(entry->d_name, "bConfigurationValue"); |
|
|
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if (has_busnum && has_devnum && has_configuration_value) |
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sysfs_can_relate_devices = 1; |
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if (has_descriptors) |
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sysfs_has_descriptors = 1; |
|
|
|
/* Only need to check until we've found ONE device which |
|
has all the attributes. */ |
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if (sysfs_has_descriptors && sysfs_can_relate_devices) |
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break; |
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} |
|
closedir(devices); |
|
|
|
/* Only use sysfs descriptors if the rest of |
|
sysfs will work for libusb. */ |
|
if (!sysfs_can_relate_devices) |
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sysfs_has_descriptors = 0; |
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} else { |
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usbi_dbg("sysfs usb info not available"); |
|
sysfs_has_descriptors = 0; |
|
sysfs_can_relate_devices = 0; |
|
} |
|
|
|
pthread_mutex_lock(&hotplug_lock); |
|
if (!init_count++) { |
|
/* start up hotplug event handler */ |
|
r = linux_start_event_monitor(); |
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if (LIBUSB_SUCCESS != r) { |
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usbi_err(ctx, "error starting hotplug event monitor"); |
|
return r; |
|
} |
|
} |
|
pthread_mutex_unlock(&hotplug_lock); |
|
|
|
r = linux_scan_devices(ctx); |
|
if (LIBUSB_SUCCESS != r) { |
|
return r; |
|
} |
|
|
|
return r; |
|
} |
|
|
|
static void op_exit(void) |
|
{ |
|
if (!init_count) { |
|
/* should not happen */ |
|
return; |
|
} |
|
|
|
pthread_mutex_lock(&hotplug_lock); |
|
if (!--init_count) { |
|
/* tear down event handler */ |
|
(void)linux_stop_event_monitor(); |
|
} |
|
pthread_mutex_unlock(&hotplug_lock); |
|
} |
|
|
|
static int linux_start_event_monitor(void) |
|
{ |
|
#if defined(USE_UDEV) |
|
return linux_udev_start_event_monitor(); |
|
#else |
|
return linux_netlink_start_event_monitor(); |
|
#endif |
|
} |
|
|
|
static int linux_stop_event_monitor(void) |
|
{ |
|
#if defined(USE_UDEV) |
|
return linux_udev_stop_event_monitor(); |
|
#else |
|
return linux_netlink_stop_event_monitor(); |
|
#endif |
|
} |
|
|
|
static int linux_scan_devices(struct libusb_context *ctx) |
|
{ |
|
#if defined(USE_UDEV) |
|
return linux_udev_scan_devices(ctx); |
|
#else |
|
return linux_default_scan_devices(ctx); |
|
#endif |
|
} |
|
|
|
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; |
|
} |
|
|
|
/* Note only suitable for attributes which always read >= 0, < 0 is error */ |
|
static int __read_sysfs_attr(struct libusb_context *ctx, |
|
const char *devname, const char *attr) |
|
{ |
|
char filename[PATH_MAX]; |
|
FILE *f; |
|
int r, value; |
|
|
|
snprintf(filename, PATH_MAX, "%s/%s/%s", SYSFS_DEVICE_PATH, |
|
devname, attr); |
|
f = fopen(filename, "r"); |
|
if (f == NULL) { |
|
if (errno == ENOENT) { |
|
/* File doesn't exist. Assume the device has been |
|
disconnected (see trac ticket #70). */ |
|
return LIBUSB_ERROR_NO_DEVICE; |
|
} |
|
usbi_err(ctx, "open %s failed errno=%d", filename, errno); |
|
return LIBUSB_ERROR_IO; |
|
} |
|
|
|
r = fscanf(f, "%d", &value); |
|
fclose(f); |
|
if (r != 1) { |
|
usbi_err(ctx, "fscanf %s returned %d, errno=%d", attr, r, errno); |
|
return LIBUSB_ERROR_NO_DEVICE; /* For unplug race (trac #70) */ |
|
} |
|
if (value < 0) { |
|
usbi_err(ctx, "%s contains a negative value", filename); |
|
return LIBUSB_ERROR_IO; |
|
} |
|
|
|
return value; |
|
} |
|
|
|
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) { |
|
*host_endian = 0; |
|
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; |
|
ssize_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_dbg("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; |
|
ssize_t 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; |
|
} |
|
|
|
int linux_get_device_address (struct libusb_context *ctx, int detached, |
|
uint8_t *busnum, uint8_t *devaddr, |
|
const char *dev_node, const char *sys_name) |
|
{ |
|
usbi_dbg("getting address for device: %s detached: %d", |
|
sys_name, detached); |
|
/* can't use sysfs to read the bus and device number if the |
|
device has been detached */ |
|
if (!sysfs_can_relate_devices || detached || NULL == sys_name) { |
|
if (NULL == dev_node) { |
|
return LIBUSB_ERROR_OTHER; |
|
} |
|
|
|
/* will this work with all supported kernel versions? */ |
|
if (!strncmp(dev_node, "/dev/bus/usb", 12)) { |
|
sscanf (dev_node, "/dev/bus/usb/%hhd/%hhd", busnum, devaddr); |
|
} else if (!strncmp(dev_node, "/proc/bus/usb", 13)) { |
|
sscanf (dev_node, "/proc/bus/usb/%hhd/%hhd", busnum, devaddr); |
|
} |
|
|
|
return LIBUSB_SUCCESS; |
|
} |
|
|
|
usbi_dbg("scan %s", sys_name); |
|
|
|
*busnum = __read_sysfs_attr(ctx, sys_name, "busnum"); |
|
if (0 > *busnum) |
|
return *busnum; |
|
|
|
*devaddr = __read_sysfs_attr(ctx, sys_name, "devnum"); |
|
if (0 > *devaddr) |
|
return *devaddr; |
|
|
|
usbi_dbg("bus=%d dev=%d", *busnum, *devaddr); |
|
if (*busnum > 255 || *devaddr > 255) |
|
return LIBUSB_ERROR_INVALID_PARAM; |
|
|
|
return LIBUSB_SUCCESS; |
|
} |
|
|
|
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, speed; |
|
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); |
|
|
|
/* Note speed can contain 1.5, in this case __read_sysfs_attr |
|
will stop parsing at the '.' and return 1 */ |
|
speed = __read_sysfs_attr(DEVICE_CTX(dev), sysfs_dir, "speed"); |
|
if (speed >= 0) { |
|
switch (speed) { |
|
case 1: dev->speed = LIBUSB_SPEED_LOW; break; |
|
case 12: dev->speed = LIBUSB_SPEED_FULL; break; |
|
case 480: dev->speed = LIBUSB_SPEED_HIGH; break; |
|
case 5000: dev->speed = LIBUSB_SPEED_SUPER; break; |
|
default: |
|
usbi_warn(DEVICE_CTX(dev), "Unknown device speed: %d Mbps", speed); |
|
} |
|
} |
|
} |
|
|
|
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; |
|
} |
|
|
|
int linux_enumerate_device(struct libusb_context *ctx, |
|
uint8_t busnum, uint8_t devaddr, |
|
const char *sysfs_dir) |
|
{ |
|
unsigned long session_id; |
|
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); |
|
|
|
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; |
|
|
|
r = initialize_device(dev, busnum, devaddr, sysfs_dir); |
|
if (r < 0) |
|
goto out; |
|
r = usbi_sanitize_device(dev); |
|
if (r < 0) |
|
goto out; |
|
out: |
|
if (r < 0) |
|
libusb_unref_device(dev); |
|
else |
|
usbi_connect_device(dev); |
|
|
|
return r; |
|
} |
|
|
|
void linux_hotplug_enumerate(uint8_t busnum, uint8_t devaddr, const char *sys_name) |
|
{ |
|
struct libusb_context *ctx; |
|
|
|
list_for_each_entry(ctx, &active_contexts_list, list, struct libusb_context) { |
|
if (usbi_get_device_by_session_id(ctx, busnum << 8 | devaddr)) { |
|
/* device already exists in the context */ |
|
usbi_dbg("device already exists in context"); |
|
continue; |
|
} |
|
|
|
linux_enumerate_device(ctx, busnum, devaddr, sys_name); |
|
} |
|
} |
|
|
|
void linux_hotplug_disconnected(uint8_t busnum, uint8_t devaddr, const char *sys_name) |
|
{ |
|
struct libusb_context *ctx; |
|
struct libusb_device *dev; |
|
|
|
list_for_each_entry(ctx, &active_contexts_list, list, struct libusb_context) { |
|
dev = usbi_get_device_by_session_id (ctx, busnum << 8 | devaddr); |
|
if (NULL != dev) { |
|
usbi_disconnect_device (dev); |
|
} else { |
|
usbi_err(ctx, "device not found for session %x", busnum << 8 | devaddr); |
|
} |
|
} |
|
} |
|
|
|
#if !defined(USE_UDEV) |
|
/* open a bus directory and adds all discovered devices to the context */ |
|
static int usbfs_scan_busdir(struct libusb_context *ctx, uint8_t busnum) |
|
{ |
|
DIR *dir; |
|
char dirpath[PATH_MAX]; |
|
struct dirent *entry; |
|
int r = LIBUSB_ERROR_IO; |
|
|
|
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 r; |
|
} |
|
|
|
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; |
|
} |
|
|
|
if (linux_enumerate_device(ctx, busnum, (uint8_t) devaddr, NULL)) { |
|
usbi_dbg("failed to enumerate dir entry %s", entry->d_name); |
|
continue; |
|
} |
|
|
|
r = 0; |
|
} |
|
|
|
closedir(dir); |
|
return r; |
|
} |
|
|
|
static int usbfs_get_device_list(struct libusb_context *ctx) |
|
{ |
|
struct dirent *entry; |
|
DIR *buses = opendir(usbfs_path); |
|
int r = 0; |
|
|
|
if (!buses) { |
|
usbi_err(ctx, "opendir buses failed errno=%d", errno); |
|
return LIBUSB_ERROR_IO; |
|
} |
|
|
|
while ((entry = readdir(buses))) { |
|
int busnum; |
|
|
|
if (entry->d_name[0] == '.') |
|
continue; |
|
|
|
if (usbdev_names) { |
|
int devaddr; |
|
if (!_is_usbdev_entry(entry, &busnum, &devaddr)) |
|
continue; |
|
|
|
r = linux_enumerate_device(ctx, busnum, (uint8_t) devaddr, NULL); |
|
if (r < 0) { |
|
usbi_dbg("failed to enumerate dir entry %s", entry->d_name); |
|
continue; |
|
} |
|
} else { |
|
busnum = atoi(entry->d_name); |
|
if (busnum == 0) { |
|
usbi_dbg("unknown dir entry %s", entry->d_name); |
|
continue; |
|
} |
|
|
|
r = usbfs_scan_busdir(ctx, busnum); |
|
if (r < 0) |
|
break; |
|
} |
|
} |
|
|
|
closedir(buses); |
|
return r; |
|
|
|
} |
|
|
|
static int sysfs_scan_device(struct libusb_context *ctx, const char *devname) |
|
{ |
|
uint8_t busnum, devaddr; |
|
int ret; |
|
|
|
ret = linux_get_device_address (ctx, 0, &busnum, &devaddr, NULL, devname); |
|
if (LIBUSB_SUCCESS != ret) { |
|
return ret; |
|
} |
|
|
|
return linux_enumerate_device(ctx, busnum & 0xff, devaddr & 0xff, |
|
devname); |
|
} |
|
|
|
static int sysfs_get_device_list(struct libusb_context *ctx) |
|
{ |
|
DIR *devices = opendir(SYSFS_DEVICE_PATH); |
|
struct dirent *entry; |
|
int r = LIBUSB_ERROR_IO; |
|
|
|
if (!devices) { |
|
usbi_err(ctx, "opendir devices failed errno=%d", errno); |
|
return r; |
|
} |
|
|
|
while ((entry = readdir(devices))) { |
|
if ((!isdigit(entry->d_name[0]) && strncmp(entry->d_name, "usb", 3)) |
|
|| strchr(entry->d_name, ':')) |
|
continue; |
|
|
|
if (sysfs_scan_device(ctx, entry->d_name)) { |
|
usbi_dbg("failed to enumerate dir entry %s", entry->d_name); |
|
continue; |
|
} |
|
|
|
r = 0; |
|
} |
|
|
|
closedir(devices); |
|
return r; |
|
} |
|
|
|
static int linux_default_scan_devices (struct libusb_context *ctx) |
|
{ |
|
/* 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 at the top of this |
|
* file, sometimes we have sysfs but not enough information to |
|
* relate sysfs devices to usbfs nodes. op_init() determines the |
|
* adequacy of sysfs and sets sysfs_can_relate_devices. |
|
*/ |
|
if (sysfs_can_relate_devices != 0) |
|
return sysfs_get_device_list(ctx); |
|
else |
|
return usbfs_get_device_list(ctx); |
|
} |
|
#endif |
|
|
|
static int op_open(struct libusb_device_handle *handle) |
|
{ |
|
struct linux_device_handle_priv *hpriv = _device_handle_priv(handle); |
|
char filename[PATH_MAX]; |
|
int r; |
|
|
|
_get_usbfs_path(handle->dev, filename); |
|
usbi_dbg("opening %s", 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) { |
|
usbi_err(HANDLE_CTX(handle), "libusb couldn't open USB device %s: " |
|
"No such file or directory.", filename); |
|
return LIBUSB_ERROR_NO_DEVICE; |
|
} else { |
|
usbi_err(HANDLE_CTX(handle), |
|
"open failed, code %d errno %d", hpriv->fd, errno); |
|
return LIBUSB_ERROR_IO; |
|
} |
|
} |
|
|
|
r = ioctl(hpriv->fd, IOCTL_USBFS_GET_CAPABILITIES, &hpriv->caps); |
|
if (r < 0) { |
|
if (errno == ENOTTY) |
|
usbi_dbg("%s: getcap not available", filename); |
|
else |
|
usbi_err(HANDLE_CTX(handle), |
|
"%s: getcap failed (%d)", filename, errno); |
|
hpriv->caps = 0; |
|
if (supports_flag_zero_packet) |
|
hpriv->caps |= USBFS_CAP_ZERO_PACKET; |
|
if (supports_flag_bulk_continuation) |
|
hpriv->caps |= USBFS_CAP_BULK_CONTINUATION; |
|
} |
|
|
|
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 (r < 0) |
|
return r; |
|
|
|
if (*config == -1) { |
|
usbi_err(HANDLE_CTX(handle), "device unconfigured"); |
|
*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 i, r, ret = 0; |
|
|
|
/* Doing a device reset will cause the usbfs driver to get unbound |
|
from any interfaces it is bound to. By voluntarily unbinding |
|
the usbfs driver ourself, we stop the kernel from rebinding |
|
the interface after reset (which would end up with the interface |
|
getting bound to the in kernel driver if any). */ |
|
for (i = 0; i < USB_MAXINTERFACES; i++) { |
|
if (handle->claimed_interfaces & (1L << i)) { |
|
op_release_interface(handle, i); |
|
} |
|
} |
|
|
|
usbi_mutex_lock(&handle->lock); |
|
r = ioctl(fd, IOCTL_USBFS_RESET, NULL); |
|
if (r) { |
|
if (errno == ENODEV) { |
|
ret = LIBUSB_ERROR_NOT_FOUND; |
|
goto out; |
|
} |
|
|
|
usbi_err(HANDLE_CTX(handle), |
|
"reset failed error %d errno %d", r, errno); |
|
ret = LIBUSB_ERROR_OTHER; |
|
goto out; |
|
} |
|
|
|
/* And re-claim any interfaces which were claimed before the reset */ |
|
for (i = 0; i < USB_MAXINTERFACES; i++) { |
|
if (handle->claimed_interfaces & (1L << i)) { |
|
r = op_claim_interface(handle, i); |
|
if (r) { |
|
usbi_warn(HANDLE_CTX(handle), |
|
"failed to re-claim interface %d after reset", i); |
|
handle->claimed_interfaces &= ~(1L << i); |
|
} |
|
} |
|
} |
|
out: |
|
usbi_mutex_unlock(&handle->lock); |
|
return ret; |
|
} |
|
|
|
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); |
|
} |
|
|
|
/* URBs are discarded in reverse order of submission to avoid races. */ |
|
static int discard_urbs(struct usbi_transfer *itransfer, int first, int last_plus_one) |
|
{ |
|
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); |
|
int i, ret = 0; |
|
struct usbfs_urb *urb; |
|
|
|
for (i = last_plus_one - 1; i >= first; i--) { |
|
if (LIBUSB_TRANSFER_TYPE_ISOCHRONOUS == transfer->type) |
|
urb = tpriv->iso_urbs[i]; |
|
else |
|
urb = &tpriv->urbs[i]; |
|
|
|
if (0 == ioctl(dpriv->fd, IOCTL_USBFS_DISCARDURB, urb)) |
|
continue; |
|
|
|
if (EINVAL == errno) { |
|
usbi_dbg("URB not found --> assuming ready to be reaped"); |
|
if (i == (last_plus_one - 1)) |
|
ret = LIBUSB_ERROR_NOT_FOUND; |
|
} else if (ENODEV == errno) { |
|
usbi_dbg("Device not found for URB --> assuming ready to be reaped"); |
|
ret = LIBUSB_ERROR_NO_DEVICE; |
|
} else { |
|
usbi_warn(TRANSFER_CTX(transfer), |
|
"unrecognised discard errno %d", errno); |
|
ret = LIBUSB_ERROR_OTHER; |
|
} |
|
} |
|
return ret; |
|
} |
|
|
|
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 bulk_buffer_len, use_bulk_continuation; |
|
int r; |
|
int i; |
|
size_t alloc_size; |
|
|
|
if (tpriv->urbs) |
|
return LIBUSB_ERROR_BUSY; |
|
|
|
if (is_out && (transfer->flags & LIBUSB_TRANSFER_ADD_ZERO_PACKET) && |
|
!(dpriv->caps & USBFS_CAP_ZERO_PACKET)) |
|
return LIBUSB_ERROR_NOT_SUPPORTED; |
|
|
|
/* |
|
* Older versions of usbfs place a 16kb limit on bulk URBs. We work |
|
* around this by splitting large transfers into 16k blocks, and then |
|
* submit all urbs at once. it would be simpler to submit one urb at |
|
* a time, but there is a big performance gain doing it this way. |
|
* |
|
* Newer versions lift the 16k limit (USBFS_CAP_NO_PACKET_SIZE_LIM), |
|
* using arbritary large transfers can still be a bad idea though, as |
|
* the kernel needs to allocate physical contiguous memory for this, |
|
* which may fail for large buffers. |
|
* |
|
* The kernel solves this problem by splitting the transfer into |
|
* blocks itself when the host-controller is scatter-gather capable |
|
* (USBFS_CAP_BULK_SCATTER_GATHER), which most controllers are. |
|
* |
|
* Last, there is the issue of short-transfers when splitting, for |
|
* short split-transfers to work reliable USBFS_CAP_BULK_CONTINUATION |
|
* is needed, but this is not always available. |
|
*/ |
|
if (dpriv->caps & USBFS_CAP_BULK_SCATTER_GATHER) { |
|
/* Good! Just submit everything in one go */ |
|
bulk_buffer_len = transfer->length ? transfer->length : 1; |
|
use_bulk_continuation = 0; |
|
} else if (dpriv->caps & USBFS_CAP_BULK_CONTINUATION) { |
|
/* Split the transfers and use bulk-continuation to |
|
avoid issues with short-transfers */ |
|
bulk_buffer_len = MAX_BULK_BUFFER_LENGTH; |
|
use_bulk_continuation = 1; |
|
} else if (dpriv->caps & USBFS_CAP_NO_PACKET_SIZE_LIM) { |
|
/* Don't split, assume the kernel can alloc the buffer |
|
(otherwise the submit will fail with -ENOMEM) */ |
|
bulk_buffer_len = transfer->length ? transfer->length : 1; |
|
use_bulk_continuation = 0; |
|
} else { |
|
/* Bad, splitting without bulk-continuation, short transfers |
|
which end before the last urb will not work reliable! */ |
|
/* Note we don't warn here as this is "normal" on kernels < |
|
2.6.32 and not a problem for most applications */ |
|
bulk_buffer_len = MAX_BULK_BUFFER_LENGTH; |
|
use_bulk_continuation = 0; |
|
} |
|
|
|
int num_urbs = transfer->length / bulk_buffer_len; |
|
int last_urb_partial = 0; |
|
|
|
if (transfer->length == 0) { |
|
num_urbs = 1; |
|
} else if ((transfer->length % bulk_buffer_len) > 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 * bulk_buffer_len); |
|
/* don't set the short not ok flag for the last URB */ |
|
if (use_bulk_continuation && !is_out && i < num_urbs - 1) |
|
urb->flags = USBFS_URB_SHORT_NOT_OK; |
|
if (i == num_urbs - 1 && last_urb_partial) |
|
urb->buffer_length = transfer->length % bulk_buffer_len; |
|
else if (transfer->length == 0) |
|
urb->buffer_length = 0; |
|
else |
|
urb->buffer_length = bulk_buffer_len; |
|
|
|
if (i > 0 && use_bulk_continuation) |
|
urb->flags |= USBFS_URB_BULK_CONTINUATION; |
|
|
|
/* we have already checked that the flag is supported */ |
|
if (is_out && i == num_urbs - 1 && |
|
transfer->flags & LIBUSB_TRANSFER_ADD_ZERO_PACKET) |
|
urb->flags |= USBFS_URB_ZERO_PACKET; |
|
|
|
r = ioctl(dpriv->fd, IOCTL_USBFS_SUBMITURB, urb); |
|
if (r < 0) { |
|
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; |
|
|
|
discard_urbs(itransfer, 0, i); |
|
|
|
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. |
|
* |
|
* Newer kernels lift the 32k limit (USBFS_CAP_NO_PACKET_SIZE_LIM), |
|
* using arbritary large transfers is still be a bad idea though, as |
|
* the kernel needs to allocate physical contiguous memory for this, |
|
* which may fail for large buffers. |
|
*/ |
|
|
|
/* calculate how many URBs we need */ |
|
for (i = 0; i < num_packets; i++) { |
|
unsigned 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; |
|
unsigned 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) { |
|
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; |
|
discard_urbs(itransfer, 0, i); |
|
|
|
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->num_urbs = 1; |
|
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 op_cancel_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); |
|
|
|
switch (transfer->type) { |
|
case LIBUSB_TRANSFER_TYPE_BULK: |
|
if (tpriv->reap_action == ERROR) |
|
break; |
|
/* else, fall through */ |
|
case LIBUSB_TRANSFER_TYPE_CONTROL: |
|
case LIBUSB_TRANSFER_TYPE_INTERRUPT: |
|
case LIBUSB_TRANSFER_TYPE_ISOCHRONOUS: |
|
tpriv->reap_action = CANCELLED; |
|
break; |
|
default: |
|
usbi_err(TRANSFER_CTX(transfer), |
|
"unknown endpoint type %d", transfer->type); |
|
return LIBUSB_ERROR_INVALID_PARAM; |
|
} |
|
|
|
if (!tpriv->urbs) |
|
return LIBUSB_ERROR_NOT_FOUND; |
|
|
|
return discard_urbs(itransfer, 0, tpriv->num_urbs); |
|
} |
|
|
|
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); |
|
|
|
/* urbs can be freed also in submit_transfer so lock mutex first */ |
|
switch (transfer->type) { |
|
case LIBUSB_TRANSFER_TYPE_CONTROL: |
|
case LIBUSB_TRANSFER_TYPE_BULK: |
|
case LIBUSB_TRANSFER_TYPE_INTERRUPT: |
|
usbi_mutex_lock(&itransfer->lock); |
|
if (tpriv->urbs) |
|
free(tpriv->urbs); |
|
tpriv->urbs = NULL; |
|
usbi_mutex_unlock(&itransfer->lock); |
|
break; |
|
case LIBUSB_TRANSFER_TYPE_ISOCHRONOUS: |
|
usbi_mutex_lock(&itransfer->lock); |
|
if (tpriv->iso_urbs) |
|
free_iso_urbs(tpriv); |
|
usbi_mutex_unlock(&itransfer->lock); |
|
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); |
|
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). |
|
* (this can't happen since we always use BULK_CONTINUATION.) |
|
* |
|
* 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; |
|
} |
|
|
|
itransfer->transferred += urb->actual_length; |
|
|
|
/* Many of these errors can occur on *any* urb of a multi-urb |
|
* transfer. When they do, we tear down the rest of the transfer. |
|
*/ |
|
switch (urb->status) { |
|
case 0: |
|
break; |
|
case -EREMOTEIO: /* short transfer */ |
|
break; |
|
case -ENOENT: /* cancelled */ |
|
case -ECONNRESET: |
|
break; |
|
case -ENODEV: |
|
case -ESHUTDOWN: |
|
usbi_dbg("device removed"); |
|
tpriv->reap_status = LIBUSB_TRANSFER_NO_DEVICE; |
|
goto cancel_remaining; |
|
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: |
|
case -ECOMM: |
|
case -ENOSR: |
|
usbi_dbg("low level error %d", urb->status); |
|
tpriv->reap_action = ERROR; |
|
goto cancel_remaining; |
|
default: |
|
usbi_warn(ITRANSFER_CTX(itransfer), |
|
"unrecognised urb status %d", urb->status); |
|
tpriv->reap_action = 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 (ERROR == tpriv->reap_action && LIBUSB_TRANSFER_COMPLETED == tpriv->reap_status) |
|
tpriv->reap_status = LIBUSB_TRANSFER_ERROR; |
|
|
|
if (tpriv->num_retired == tpriv->num_urbs) /* nothing to cancel */ |
|
goto completed; |
|
|
|
/* cancel remaining urbs and wait for their completion before |
|
* reporting results */ |
|
discard_urbs(itransfer, urb_idx + 1, tpriv->num_urbs); |
|
|
|
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; |
|
enum libusb_transfer_status status = LIBUSB_TRANSFER_COMPLETED; |
|
|
|
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); |
|
|
|
/* 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 = LIBUSB_TRANSFER_COMPLETED; |
|
switch (urb_desc->status) { |
|
case 0: |
|
break; |
|
case -ENOENT: /* cancelled */ |
|
case -ECONNRESET: |
|
break; |
|
case -ENODEV: |
|
case -ESHUTDOWN: |
|
usbi_dbg("device removed"); |
|
lib_desc->status = LIBUSB_TRANSFER_NO_DEVICE; |
|
break; |
|
case -EPIPE: |
|
usbi_dbg("detected endpoint stall"); |
|
lib_desc->status = LIBUSB_TRANSFER_STALL; |
|
break; |
|
case -EOVERFLOW: |
|
usbi_dbg("overflow error"); |
|
lib_desc->status = LIBUSB_TRANSFER_OVERFLOW; |
|
break; |
|
case -ETIME: |
|
case -EPROTO: |
|
case -EILSEQ: |
|
case -ECOMM: |
|
case -ENOSR: |
|
case -EXDEV: |
|
usbi_dbg("low-level USB error %d", urb_desc->status); |
|
lib_desc->status = LIBUSB_TRANSFER_ERROR; |
|
break; |
|
default: |
|
usbi_warn(TRANSFER_CTX(transfer), |
|
"unrecognised urb status %d", urb_desc->status); |
|
lib_desc->status = LIBUSB_TRANSFER_ERROR; |
|
break; |
|
} |
|
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 -ENOENT: /* cancelled */ |
|
case -ECONNRESET: |
|
break; |
|
case -ESHUTDOWN: |
|
usbi_dbg("device removed"); |
|
status = LIBUSB_TRANSFER_NO_DEVICE; |
|
break; |
|
default: |
|
usbi_warn(TRANSFER_CTX(transfer), |
|
"unrecognised urb status %d", urb->status); |
|
status = LIBUSB_TRANSFER_ERROR; |
|
break; |
|
} |
|
|
|
/* if we're the last urb 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, status); |
|
} |
|
|
|
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); |
|
|
|
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: |
|
status = LIBUSB_TRANSFER_COMPLETED; |
|
break; |
|
case -ENOENT: /* cancelled */ |
|
status = LIBUSB_TRANSFER_CANCELLED; |
|
break; |
|
case -ENODEV: |
|
case -ESHUTDOWN: |
|
usbi_dbg("device removed"); |
|
status = LIBUSB_TRANSFER_NO_DEVICE; |
|
break; |
|
case -EPIPE: |
|
usbi_dbg("unsupported control request"); |
|
status = LIBUSB_TRANSFER_STALL; |
|
break; |
|
case -EOVERFLOW: |
|
usbi_dbg("control overflow error"); |
|
status = LIBUSB_TRANSFER_OVERFLOW; |
|
break; |
|
case -ETIME: |
|
case -EPROTO: |
|
case -EILSEQ: |
|
case -ECOMM: |
|
case -ENOSR: |
|
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, POLL_NFDS_TYPE nfds, int num_ready) |
|
{ |
|
int r; |
|
unsigned 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; |
|
} |
|
|
|
do { |
|
r = reap_for_handle(handle); |
|
} while (r == 0); |
|
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 = op_exit, |
|
.get_device_list = NULL, |
|
.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, |
|
}; |
|
|
|
|