diff options
Diffstat (limited to 'src/usb.c')
| -rw-r--r-- | src/usb.c | 680 |
1 files changed, 680 insertions, 0 deletions
diff --git a/src/usb.c b/src/usb.c new file mode 100644 index 0000000..f5e8092 --- /dev/null +++ b/src/usb.c @@ -0,0 +1,680 @@ +/* + * usb.c + * + * Copyright (C) 2009 Hector Martin <hector@marcansoft.com> + * Copyright (C) 2009 Nikias Bassen <nikias@gmx.li> + * Copyright (C) 2009 Martin Szulecki <opensuse@sukimashita.com> + * Copyright (C) 2014 Mikkel Kamstrup Erlandsen <mikkel.kamstrup@xamarin.com> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation, either version 2 or version 3. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + */ + +#ifdef HAVE_CONFIG_H +#include <config.h> +#endif + +#include <stdio.h> +#include <stdlib.h> +#include <stdint.h> +#include <string.h> + +#include <libusb.h> + +#include "usb.h" +#include "log.h" +#include "device.h" +#include "utils.h" + +// interval for device connection/disconnection polling, in milliseconds +// we need this because there is currently no asynchronous device discovery mechanism in libusb +#define DEVICE_POLL_TIME 1000 + +// Number of parallel bulk transfers we have running for reading data from the device. +// Older versions of usbmuxd kept only 1, which leads to a mostly dormant USB port. +// 3 seems to be an all round sensible number - giving better read perf than +// Apples usbmuxd, at least. +#define NUM_RX_LOOPS 3 + +struct usb_device { + libusb_device_handle *dev; + uint8_t bus, address; + uint16_t vid, pid; + char serial[256]; + int alive; + uint8_t interface, ep_in, ep_out; + struct collection rx_xfers; + struct collection tx_xfers; + int wMaxPacketSize; + uint64_t speed; +}; + +static struct collection device_list; + +static struct timeval next_dev_poll_time; + +static int devlist_failures; +static int device_polling; + +static void usb_disconnect(struct usb_device *dev) +{ + if(!dev->dev) { + return; + } + + // kill the rx xfer and tx xfers and try to make sure the callbacks + // get called before we free the device + FOREACH(struct libusb_transfer *xfer, &dev->rx_xfers) { + usbmuxd_log(LL_DEBUG, "usb_disconnect: cancelling RX xfer %p", xfer); + libusb_cancel_transfer(xfer); + } ENDFOREACH + + FOREACH(struct libusb_transfer *xfer, &dev->tx_xfers) { + usbmuxd_log(LL_DEBUG, "usb_disconnect: cancelling TX xfer %p", xfer); + libusb_cancel_transfer(xfer); + } ENDFOREACH + + // Busy-wait until all xfers are closed + while(collection_count(&dev->rx_xfers) || collection_count(&dev->tx_xfers)) { + struct timeval tv; + int res; + + tv.tv_sec = 0; + tv.tv_usec = 1000; + if((res = libusb_handle_events_timeout(NULL, &tv)) < 0) { + usbmuxd_log(LL_ERROR, "libusb_handle_events_timeout for usb_disconnect failed: %d", res); + break; + } + } + + collection_free(&dev->tx_xfers); + collection_free(&dev->rx_xfers); + libusb_release_interface(dev->dev, dev->interface); + libusb_close(dev->dev); + dev->dev = NULL; + collection_remove(&device_list, dev); + free(dev); +} + +static void reap_dead_devices(void) { + FOREACH(struct usb_device *usbdev, &device_list) { + if(!usbdev->alive) { + device_remove(usbdev); + usb_disconnect(usbdev); + } + } ENDFOREACH +} + +// Callback from write operation +static void tx_callback(struct libusb_transfer *xfer) +{ + struct usb_device *dev = xfer->user_data; + usbmuxd_log(LL_SPEW, "TX callback dev %d-%d len %d -> %d status %d", dev->bus, dev->address, xfer->length, xfer->actual_length, xfer->status); + if(xfer->status != LIBUSB_TRANSFER_COMPLETED) { + switch(xfer->status) { + case LIBUSB_TRANSFER_COMPLETED: //shut up compiler + case LIBUSB_TRANSFER_ERROR: + // funny, this happens when we disconnect the device while waiting for a transfer, sometimes + usbmuxd_log(LL_INFO, "Device %d-%d TX aborted due to error or disconnect", dev->bus, dev->address); + break; + case LIBUSB_TRANSFER_TIMED_OUT: + usbmuxd_log(LL_ERROR, "TX transfer timed out for device %d-%d", dev->bus, dev->address); + break; + case LIBUSB_TRANSFER_CANCELLED: + usbmuxd_log(LL_DEBUG, "Device %d-%d TX transfer cancelled", dev->bus, dev->address); + break; + case LIBUSB_TRANSFER_STALL: + usbmuxd_log(LL_ERROR, "TX transfer stalled for device %d-%d", dev->bus, dev->address); + break; + case LIBUSB_TRANSFER_NO_DEVICE: + // other times, this happens, and also even when we abort the transfer after device removal + usbmuxd_log(LL_INFO, "Device %d-%d TX aborted due to disconnect", dev->bus, dev->address); + break; + case LIBUSB_TRANSFER_OVERFLOW: + usbmuxd_log(LL_ERROR, "TX transfer overflow for device %d-%d", dev->bus, dev->address); + break; + // and nothing happens (this never gets called) if the device is freed after a disconnect! (bad) + default: + // this should never be reached. + break; + } + // we can't usb_disconnect here due to a deadlock, so instead mark it as dead and reap it after processing events + // we'll do device_remove there too + dev->alive = 0; + } + if(xfer->buffer) + free(xfer->buffer); + collection_remove(&dev->tx_xfers, xfer); + libusb_free_transfer(xfer); +} + +int usb_send(struct usb_device *dev, const unsigned char *buf, int length) +{ + int res; + struct libusb_transfer *xfer = libusb_alloc_transfer(0); + libusb_fill_bulk_transfer(xfer, dev->dev, dev->ep_out, (void*)buf, length, tx_callback, dev, 0); + if((res = libusb_submit_transfer(xfer)) < 0) { + usbmuxd_log(LL_ERROR, "Failed to submit TX transfer %p len %d to device %d-%d: %d", buf, length, dev->bus, dev->address, res); + libusb_free_transfer(xfer); + return res; + } + collection_add(&dev->tx_xfers, xfer); + if (length % dev->wMaxPacketSize == 0) { + usbmuxd_log(LL_DEBUG, "Send ZLP"); + // Send Zero Length Packet + xfer = libusb_alloc_transfer(0); + void *buffer = malloc(1); + libusb_fill_bulk_transfer(xfer, dev->dev, dev->ep_out, buffer, 0, tx_callback, dev, 0); + if((res = libusb_submit_transfer(xfer)) < 0) { + usbmuxd_log(LL_ERROR, "Failed to submit TX ZLP transfer to device %d-%d: %d", dev->bus, dev->address, res); + libusb_free_transfer(xfer); + return res; + } + collection_add(&dev->tx_xfers, xfer); + } + return 0; +} + +// Callback from read operation +// Under normal operation this issues a new read transfer request immediately, +// doing a kind of read-callback loop +static void rx_callback(struct libusb_transfer *xfer) +{ + struct usb_device *dev = xfer->user_data; + usbmuxd_log(LL_SPEW, "RX callback dev %d-%d len %d status %d", dev->bus, dev->address, xfer->actual_length, xfer->status); + if(xfer->status == LIBUSB_TRANSFER_COMPLETED) { + device_data_input(dev, xfer->buffer, xfer->actual_length); + libusb_submit_transfer(xfer); + } else { + switch(xfer->status) { + case LIBUSB_TRANSFER_COMPLETED: //shut up compiler + case LIBUSB_TRANSFER_ERROR: + // funny, this happens when we disconnect the device while waiting for a transfer, sometimes + usbmuxd_log(LL_INFO, "Device %d-%d RX aborted due to error or disconnect", dev->bus, dev->address); + break; + case LIBUSB_TRANSFER_TIMED_OUT: + usbmuxd_log(LL_ERROR, "RX transfer timed out for device %d-%d", dev->bus, dev->address); + break; + case LIBUSB_TRANSFER_CANCELLED: + usbmuxd_log(LL_DEBUG, "Device %d-%d RX transfer cancelled", dev->bus, dev->address); + break; + case LIBUSB_TRANSFER_STALL: + usbmuxd_log(LL_ERROR, "RX transfer stalled for device %d-%d", dev->bus, dev->address); + break; + case LIBUSB_TRANSFER_NO_DEVICE: + // other times, this happens, and also even when we abort the transfer after device removal + usbmuxd_log(LL_INFO, "Device %d-%d RX aborted due to disconnect", dev->bus, dev->address); + break; + case LIBUSB_TRANSFER_OVERFLOW: + usbmuxd_log(LL_ERROR, "RX transfer overflow for device %d-%d", dev->bus, dev->address); + break; + // and nothing happens (this never gets called) if the device is freed after a disconnect! (bad) + default: + // this should never be reached. + break; + } + + free(xfer->buffer); + collection_remove(&dev->rx_xfers, xfer); + libusb_free_transfer(xfer); + + // we can't usb_disconnect here due to a deadlock, so instead mark it as dead and reap it after processing events + // we'll do device_remove there too + dev->alive = 0; + } +} + +// Start a read-callback loop for this device +static int start_rx_loop(struct usb_device *dev) +{ + int res; + void *buf; + struct libusb_transfer *xfer = libusb_alloc_transfer(0); + buf = malloc(USB_MRU); + libusb_fill_bulk_transfer(xfer, dev->dev, dev->ep_in, buf, USB_MRU, rx_callback, dev, 0); + if((res = libusb_submit_transfer(xfer)) != 0) { + usbmuxd_log(LL_ERROR, "Failed to submit RX transfer to device %d-%d: %d", dev->bus, dev->address, res); + libusb_free_transfer(xfer); + return res; + } + + collection_add(&dev->rx_xfers, xfer); + + return 0; +} + +int usb_discover(void) +{ + int cnt, i, j, res; + int valid_count = 0; + libusb_device **devs; + + cnt = libusb_get_device_list(NULL, &devs); + if(cnt < 0) { + usbmuxd_log(LL_WARNING, "Could not get device list: %d", cnt); + devlist_failures++; + // sometimes libusb fails getting the device list if you've just removed something + if(devlist_failures > 5) { + usbmuxd_log(LL_FATAL, "Too many errors getting device list"); + return cnt; + } else { + get_tick_count(&next_dev_poll_time); + next_dev_poll_time.tv_usec += DEVICE_POLL_TIME * 1000; + next_dev_poll_time.tv_sec += next_dev_poll_time.tv_usec / 1000000; + next_dev_poll_time.tv_usec = next_dev_poll_time.tv_usec % 1000000; + return 0; + } + } + devlist_failures = 0; + + usbmuxd_log(LL_SPEW, "usb_discover: scanning %d devices", cnt); + + // Mark all devices as dead, and do a mark-sweep like + // collection of dead devices + FOREACH(struct usb_device *usbdev, &device_list) { + usbdev->alive = 0; + } ENDFOREACH + + // Enumerate all USB devices and mark the ones we already know + // about as live, again + for(i=0; i<cnt; i++) { + // the following are non-blocking operations on the device list + libusb_device *dev = devs[i]; + uint8_t bus = libusb_get_bus_number(dev); + uint8_t address = libusb_get_device_address(dev); + struct libusb_device_descriptor devdesc; + int found = 0; + FOREACH(struct usb_device *usbdev, &device_list) { + if(usbdev->bus == bus && usbdev->address == address) { + valid_count++; + usbdev->alive = 1; + found = 1; + break; + } + } ENDFOREACH + if(found) + continue; //device already found + if((res = libusb_get_device_descriptor(dev, &devdesc)) != 0) { + usbmuxd_log(LL_WARNING, "Could not get device descriptor for device %d-%d: %d", bus, address, res); + continue; + } + if(devdesc.idVendor != VID_APPLE) + continue; + if((devdesc.idProduct < PID_RANGE_LOW) || + (devdesc.idProduct > PID_RANGE_MAX)) + continue; + libusb_device_handle *handle; + usbmuxd_log(LL_INFO, "Found new device with v/p %04x:%04x at %d-%d", devdesc.idVendor, devdesc.idProduct, bus, address); + // potentially blocking operations follow; they will only run when new devices are detected, which is acceptable + if((res = libusb_open(dev, &handle)) != 0) { + usbmuxd_log(LL_WARNING, "Could not open device %d-%d: %d", bus, address, res); + continue; + } + + int current_config = 0; + if((res = libusb_get_configuration(handle, ¤t_config)) != 0) { + usbmuxd_log(LL_WARNING, "Could not get configuration for device %d-%d: %d", bus, address, res); + libusb_close(handle); + continue; + } + if (current_config != devdesc.bNumConfigurations) { + struct libusb_config_descriptor *config; + if((res = libusb_get_active_config_descriptor(dev, &config)) != 0) { + usbmuxd_log(LL_NOTICE, "Could not get old configuration descriptor for device %d-%d: %d", bus, address, res); + } else { + for(j=0; j<config->bNumInterfaces; j++) { + const struct libusb_interface_descriptor *intf = &config->interface[j].altsetting[0]; + if((res = libusb_kernel_driver_active(handle, intf->bInterfaceNumber)) < 0) { + usbmuxd_log(LL_NOTICE, "Could not check kernel ownership of interface %d for device %d-%d: %d", intf->bInterfaceNumber, bus, address, res); + continue; + } + if(res == 1) { + usbmuxd_log(LL_INFO, "Detaching kernel driver for device %d-%d, interface %d", bus, address, intf->bInterfaceNumber); + if((res = libusb_detach_kernel_driver(handle, intf->bInterfaceNumber)) < 0) { + usbmuxd_log(LL_WARNING, "Could not detach kernel driver (%d), configuration change will probably fail!", res); + continue; + } + } + } + libusb_free_config_descriptor(config); + } + + usbmuxd_log(LL_INFO, "Setting configuration for device %d-%d, from %d to %d", bus, address, current_config, devdesc.bNumConfigurations); + if((res = libusb_set_configuration(handle, devdesc.bNumConfigurations)) != 0) { + usbmuxd_log(LL_WARNING, "Could not set configuration %d for device %d-%d: %d", devdesc.bNumConfigurations, bus, address, res); + libusb_close(handle); + continue; + } + } + + struct libusb_config_descriptor *config; + if((res = libusb_get_active_config_descriptor(dev, &config)) != 0) { + usbmuxd_log(LL_WARNING, "Could not get configuration descriptor for device %d-%d: %d", bus, address, res); + libusb_close(handle); + continue; + } + + struct usb_device *usbdev; + usbdev = malloc(sizeof(struct usb_device)); + memset(usbdev, 0, sizeof(*usbdev)); + + for(j=0; j<config->bNumInterfaces; j++) { + const struct libusb_interface_descriptor *intf = &config->interface[j].altsetting[0]; + if(intf->bInterfaceClass != INTERFACE_CLASS || + intf->bInterfaceSubClass != INTERFACE_SUBCLASS || + intf->bInterfaceProtocol != INTERFACE_PROTOCOL) + continue; + if(intf->bNumEndpoints != 2) { + usbmuxd_log(LL_WARNING, "Endpoint count mismatch for interface %d of device %d-%d", intf->bInterfaceNumber, bus, address); + continue; + } + if((intf->endpoint[0].bEndpointAddress & 0x80) == LIBUSB_ENDPOINT_OUT && + (intf->endpoint[1].bEndpointAddress & 0x80) == LIBUSB_ENDPOINT_IN) { + usbdev->interface = intf->bInterfaceNumber; + usbdev->ep_out = intf->endpoint[0].bEndpointAddress; + usbdev->ep_in = intf->endpoint[1].bEndpointAddress; + usbmuxd_log(LL_INFO, "Found interface %d with endpoints %02x/%02x for device %d-%d", usbdev->interface, usbdev->ep_out, usbdev->ep_in, bus, address); + break; + } else if((intf->endpoint[1].bEndpointAddress & 0x80) == LIBUSB_ENDPOINT_OUT && + (intf->endpoint[0].bEndpointAddress & 0x80) == LIBUSB_ENDPOINT_IN) { + usbdev->interface = intf->bInterfaceNumber; + usbdev->ep_out = intf->endpoint[1].bEndpointAddress; + usbdev->ep_in = intf->endpoint[0].bEndpointAddress; + usbmuxd_log(LL_INFO, "Found interface %d with swapped endpoints %02x/%02x for device %d-%d", usbdev->interface, usbdev->ep_out, usbdev->ep_in, bus, address); + break; + } else { + usbmuxd_log(LL_WARNING, "Endpoint type mismatch for interface %d of device %d-%d", intf->bInterfaceNumber, bus, address); + } + } + + if(j == config->bNumInterfaces) { + usbmuxd_log(LL_WARNING, "Could not find a suitable USB interface for device %d-%d", bus, address); + libusb_free_config_descriptor(config); + libusb_close(handle); + free(usbdev); + continue; + } + + libusb_free_config_descriptor(config); + + if((res = libusb_claim_interface(handle, usbdev->interface)) != 0) { + usbmuxd_log(LL_WARNING, "Could not claim interface %d for device %d-%d: %d", usbdev->interface, bus, address, res); + libusb_close(handle); + free(usbdev); + continue; + } + + if((res = libusb_get_string_descriptor_ascii(handle, devdesc.iSerialNumber, (uint8_t *)usbdev->serial, 256)) <= 0) { + usbmuxd_log(LL_WARNING, "Could not get serial number for device %d-%d: %d", bus, address, res); + libusb_release_interface(handle, usbdev->interface); + libusb_close(handle); + free(usbdev); + continue; + } + usbdev->serial[res] = 0; + usbdev->bus = bus; + usbdev->address = address; + usbdev->vid = devdesc.idVendor; + usbdev->pid = devdesc.idProduct; + usbdev->speed = 480000000; + usbdev->dev = handle; + usbdev->alive = 1; + usbdev->wMaxPacketSize = libusb_get_max_packet_size(dev, usbdev->ep_out); + if (usbdev->wMaxPacketSize <= 0) { + usbmuxd_log(LL_ERROR, "Could not determine wMaxPacketSize for device %d-%d, setting to 64", usbdev->bus, usbdev->address); + usbdev->wMaxPacketSize = 64; + } else { + usbmuxd_log(LL_INFO, "Using wMaxPacketSize=%d for device %d-%d", usbdev->wMaxPacketSize, usbdev->bus, usbdev->address); + } + + switch (libusb_get_device_speed(dev)) { + case LIBUSB_SPEED_LOW: + usbdev->speed = 1500000; + break; + case LIBUSB_SPEED_FULL: + usbdev->speed = 12000000; + break; + case LIBUSB_SPEED_SUPER: + usbdev->speed = 5000000000; + break; + case LIBUSB_SPEED_HIGH: + case LIBUSB_SPEED_UNKNOWN: + default: + usbdev->speed = 480000000; + break; + } + + usbmuxd_log(LL_INFO, "USB Speed is %g MBit/s for device %d-%d", (double)(usbdev->speed / 1000000.0), usbdev->bus, usbdev->address); + + collection_init(&usbdev->tx_xfers); + collection_init(&usbdev->rx_xfers); + + collection_add(&device_list, usbdev); + + if(device_add(usbdev) < 0) { + usb_disconnect(usbdev); + continue; + } + + // Spin up NUM_RX_LOOPS parallel usb data retrieval loops + // Old usbmuxds used only 1 rx loop, but that leaves the + // USB port sleeping most of the time + int rx_loops = NUM_RX_LOOPS; + for (rx_loops = NUM_RX_LOOPS; rx_loops > 0; rx_loops--) { + if(start_rx_loop(usbdev) < 0) { + usbmuxd_log(LL_WARNING, "Failed to start RX loop number %d", NUM_RX_LOOPS - rx_loops); + } + } + + // Ensure we have at least 1 RX loop going + if (rx_loops == NUM_RX_LOOPS) { + usbmuxd_log(LL_FATAL, "Failed to start any RX loop for device %d-%d", + usbdev->bus, usbdev->address); + device_remove(usbdev); + usb_disconnect(usbdev); + continue; + } else if (rx_loops > 0) { + usbmuxd_log(LL_WARNING, "Failed to start all %d RX loops. Going on with %d loops. " + "This may have negative impact on device read speed.", + NUM_RX_LOOPS, NUM_RX_LOOPS - rx_loops); + } else { + usbmuxd_log(LL_DEBUG, "All %d RX loops started successfully", NUM_RX_LOOPS); + } + + valid_count++; + } + + // Clean out any device we didn't mark back as live + reap_dead_devices(); + + libusb_free_device_list(devs, 1); + + get_tick_count(&next_dev_poll_time); + next_dev_poll_time.tv_usec += DEVICE_POLL_TIME * 1000; + next_dev_poll_time.tv_sec += next_dev_poll_time.tv_usec / 1000000; + next_dev_poll_time.tv_usec = next_dev_poll_time.tv_usec % 1000000; + + return valid_count; +} + +const char *usb_get_serial(struct usb_device *dev) +{ + if(!dev->dev) { + return NULL; + } + return dev->serial; +} + +uint32_t usb_get_location(struct usb_device *dev) +{ + if(!dev->dev) { + return 0; + } + return (dev->bus << 16) | dev->address; +} + +uint16_t usb_get_pid(struct usb_device *dev) +{ + if(!dev->dev) { + return 0; + } + return dev->pid; +} + +uint64_t usb_get_speed(struct usb_device *dev) +{ + if (!dev->dev) { + return 0; + } + return dev->speed; +} + +void usb_get_fds(struct fdlist *list) +{ + const struct libusb_pollfd **usbfds; + const struct libusb_pollfd **p; + usbfds = libusb_get_pollfds(NULL); + if(!usbfds) { + usbmuxd_log(LL_ERROR, "libusb_get_pollfds failed"); + return; + } + p = usbfds; + while(*p) { + fdlist_add(list, FD_USB, (*p)->fd, (*p)->events); + p++; + } + free(usbfds); +} + +void usb_autodiscover(int enable) +{ + usbmuxd_log(LL_DEBUG, "usb polling enable: %d", enable); + device_polling = enable; +} + +static int dev_poll_remain_ms(void) +{ + int msecs; + struct timeval tv; + if(!device_polling) + return 100000; // devices will never be polled if this is > 0 + get_tick_count(&tv); + msecs = (next_dev_poll_time.tv_sec - tv.tv_sec) * 1000; + msecs += (next_dev_poll_time.tv_usec - tv.tv_usec) / 1000; + if(msecs < 0) + return 0; + return msecs; +} + +int usb_get_timeout(void) +{ + struct timeval tv; + int msec; + int res; + int pollrem; + pollrem = dev_poll_remain_ms(); + res = libusb_get_next_timeout(NULL, &tv); + if(res == 0) + return pollrem; + if(res < 0) { + usbmuxd_log(LL_ERROR, "libusb_get_next_timeout failed: %d", res); + return pollrem; + } + msec = tv.tv_sec * 1000; + msec += tv.tv_usec / 1000; + if(msec > pollrem) + return pollrem; + return msec; +} + +int usb_process(void) +{ + int res; + struct timeval tv; + tv.tv_sec = tv.tv_usec = 0; + res = libusb_handle_events_timeout(NULL, &tv); + if(res < 0) { + usbmuxd_log(LL_ERROR, "libusb_handle_events_timeout failed: %d", res); + return res; + } + + // reap devices marked dead due to an RX error + reap_dead_devices(); + + if(dev_poll_remain_ms() <= 0) { + res = usb_discover(); + if(res < 0) { + usbmuxd_log(LL_ERROR, "usb_discover failed: %d", res); + return res; + } + } + return 0; +} + +int usb_process_timeout(int msec) +{ + int res; + struct timeval tleft, tcur, tfin; + get_tick_count(&tcur); + tfin.tv_sec = tcur.tv_sec + (msec / 1000); + tfin.tv_usec = tcur.tv_usec + (msec % 1000) * 1000; + tfin.tv_sec += tfin.tv_usec / 1000000; + tfin.tv_usec %= 1000000; + while((tfin.tv_sec > tcur.tv_sec) || ((tfin.tv_sec == tcur.tv_sec) && (tfin.tv_usec > tcur.tv_usec))) { + tleft.tv_sec = tfin.tv_sec - tcur.tv_sec; + tleft.tv_usec = tfin.tv_usec - tcur.tv_usec; + if(tleft.tv_usec < 0) { + tleft.tv_usec += 1000000; + tleft.tv_sec -= 1; + } + res = libusb_handle_events_timeout(NULL, &tleft); + if(res < 0) { + usbmuxd_log(LL_ERROR, "libusb_handle_events_timeout failed: %d", res); + return res; + } + // reap devices marked dead due to an RX error + reap_dead_devices(); + get_tick_count(&tcur); + } + return 0; +} + +int usb_init(void) +{ + int res; + usbmuxd_log(LL_DEBUG, "usb_init for linux / libusb 1.0"); + + devlist_failures = 0; + device_polling = 1; + res = libusb_init(NULL); + //libusb_set_debug(NULL, 3); + if(res != 0) { + usbmuxd_log(LL_FATAL, "libusb_init failed: %d", res); + return -1; + } + + collection_init(&device_list); + + return usb_discover(); +} + +void usb_shutdown(void) +{ + usbmuxd_log(LL_DEBUG, "usb_shutdown"); + FOREACH(struct usb_device *usbdev, &device_list) { + device_remove(usbdev); + usb_disconnect(usbdev); + } ENDFOREACH + collection_free(&device_list); + libusb_exit(NULL); +} |