1 /* $FreeBSD$ */ 2 /*- 3 * Copyright (c) 2016 Hans Petter Selasky. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 */ 26 27 #ifdef LIBUSB_GLOBAL_INCLUDE_FILE 28 #include LIBUSB_GLOBAL_INCLUDE_FILE 29 #else 30 #include <assert.h> 31 #include <errno.h> 32 #include <poll.h> 33 #include <pthread.h> 34 #include <stdio.h> 35 #include <stdlib.h> 36 #include <string.h> 37 #include <unistd.h> 38 #include <time.h> 39 #include <sys/fcntl.h> 40 #include <sys/ioctl.h> 41 #include <sys/queue.h> 42 #include <sys/endian.h> 43 #endif 44 45 #define libusb_device_handle libusb20_device 46 47 #include "libusb20.h" 48 #include "libusb20_desc.h" 49 #include "libusb20_int.h" 50 #include "libusb.h" 51 #include "libusb10.h" 52 53 static int 54 libusb_hotplug_equal(libusb_device *_adev, libusb_device *_bdev) 55 { 56 struct libusb20_device *adev = _adev->os_priv; 57 struct libusb20_device *bdev = _bdev->os_priv; 58 59 if (adev->bus_number != bdev->bus_number) 60 return (0); 61 if (adev->device_address != bdev->device_address) 62 return (0); 63 if (memcmp(&adev->ddesc, &bdev->ddesc, sizeof(adev->ddesc))) 64 return (0); 65 if (memcmp(&adev->session_data, &bdev->session_data, sizeof(adev->session_data))) 66 return (0); 67 return (1); 68 } 69 70 static int 71 libusb_hotplug_filter(libusb_context *ctx, libusb_hotplug_callback_handle pcbh, 72 libusb_device *dev, libusb_hotplug_event event) 73 { 74 if (!(pcbh->events & event)) 75 return (0); 76 if (pcbh->vendor != LIBUSB_HOTPLUG_MATCH_ANY && 77 pcbh->vendor != libusb20_dev_get_device_desc(dev->os_priv)->idVendor) 78 return (0); 79 if (pcbh->product != LIBUSB_HOTPLUG_MATCH_ANY && 80 pcbh->product != libusb20_dev_get_device_desc(dev->os_priv)->idProduct) 81 return (0); 82 if (pcbh->devclass != LIBUSB_HOTPLUG_MATCH_ANY && 83 pcbh->devclass != libusb20_dev_get_device_desc(dev->os_priv)->bDeviceClass) 84 return (0); 85 return (pcbh->fn(ctx, dev, event, pcbh->user_data)); 86 } 87 88 static void * 89 libusb_hotplug_scan(void *arg) 90 { 91 TAILQ_HEAD(, libusb_device) hotplug_devs; 92 libusb_hotplug_callback_handle acbh; 93 libusb_hotplug_callback_handle bcbh; 94 libusb_context *ctx = arg; 95 libusb_device **ppdev; 96 libusb_device *temp; 97 libusb_device *adev; 98 libusb_device *bdev; 99 unsigned do_loop = 1; 100 ssize_t count; 101 ssize_t x; 102 103 while (do_loop) { 104 usleep(4000000); 105 106 HOTPLUG_LOCK(ctx); 107 108 TAILQ_INIT(&hotplug_devs); 109 110 if (ctx->hotplug_handler != NO_THREAD) { 111 count = libusb_get_device_list(ctx, &ppdev); 112 if (count < 0) 113 continue; 114 for (x = 0; x != count; x++) { 115 TAILQ_INSERT_TAIL(&hotplug_devs, ppdev[x], 116 hotplug_entry); 117 } 118 libusb_free_device_list(ppdev, 0); 119 } else { 120 do_loop = 0; 121 } 122 123 /* figure out which devices are gone */ 124 TAILQ_FOREACH_MUTABLE(adev, &ctx->hotplug_devs, hotplug_entry, temp) { 125 TAILQ_FOREACH(bdev, &hotplug_devs, hotplug_entry) { 126 if (libusb_hotplug_equal(adev, bdev)) 127 break; 128 } 129 if (bdev == NULL) { 130 TAILQ_REMOVE(&ctx->hotplug_devs, adev, hotplug_entry); 131 TAILQ_FOREACH_MUTABLE(acbh, &ctx->hotplug_cbh, entry, bcbh) { 132 if (libusb_hotplug_filter(ctx, acbh, adev, 133 LIBUSB_HOTPLUG_EVENT_DEVICE_LEFT) == 0) 134 continue; 135 TAILQ_REMOVE(&ctx->hotplug_cbh, acbh, entry); 136 free(acbh); 137 } 138 libusb_unref_device(adev); 139 } 140 } 141 142 /* figure out which devices are new */ 143 TAILQ_FOREACH_MUTABLE(adev, &hotplug_devs, hotplug_entry, temp) { 144 TAILQ_FOREACH(bdev, &ctx->hotplug_devs, hotplug_entry) { 145 if (libusb_hotplug_equal(adev, bdev)) 146 break; 147 } 148 if (bdev == NULL) { 149 TAILQ_REMOVE(&hotplug_devs, adev, hotplug_entry); 150 TAILQ_INSERT_TAIL(&ctx->hotplug_devs, adev, hotplug_entry); 151 TAILQ_FOREACH_MUTABLE(acbh, &ctx->hotplug_cbh, entry, bcbh) { 152 if (libusb_hotplug_filter(ctx, acbh, adev, 153 LIBUSB_HOTPLUG_EVENT_DEVICE_ARRIVED) == 0) 154 continue; 155 TAILQ_REMOVE(&ctx->hotplug_cbh, acbh, entry); 156 free(acbh); 157 } 158 } 159 } 160 HOTPLUG_UNLOCK(ctx); 161 162 /* unref remaining devices */ 163 while ((adev = TAILQ_FIRST(&hotplug_devs)) != NULL) { 164 TAILQ_REMOVE(&hotplug_devs, adev, hotplug_entry); 165 libusb_unref_device(adev); 166 } 167 } 168 return (NULL); 169 } 170 171 int libusb_hotplug_register_callback(libusb_context *ctx, 172 libusb_hotplug_event events, libusb_hotplug_flag flags, 173 int vendor_id, int product_id, int dev_class, 174 libusb_hotplug_callback_fn cb_fn, void *user_data, 175 libusb_hotplug_callback_handle *phandle) 176 { 177 libusb_hotplug_callback_handle handle; 178 struct libusb_device *adev; 179 180 ctx = GET_CONTEXT(ctx); 181 182 if (ctx == NULL || cb_fn == NULL || events == 0 || 183 vendor_id < -1 || vendor_id > 0xffff || 184 product_id < -1 || product_id > 0xffff || 185 dev_class < -1 || dev_class > 0xff) 186 return (LIBUSB_ERROR_INVALID_PARAM); 187 188 handle = malloc(sizeof(*handle)); 189 if (handle == NULL) 190 return (LIBUSB_ERROR_NO_MEM); 191 192 HOTPLUG_LOCK(ctx); 193 if (ctx->hotplug_handler == NO_THREAD) { 194 if (pthread_create(&ctx->hotplug_handler, NULL, 195 &libusb_hotplug_scan, ctx) != 0) 196 ctx->hotplug_handler = NO_THREAD; 197 } 198 handle->events = events; 199 handle->vendor = vendor_id; 200 handle->product = product_id; 201 handle->devclass = dev_class; 202 handle->fn = cb_fn; 203 handle->user_data = user_data; 204 205 if (flags & LIBUSB_HOTPLUG_ENUMERATE) { 206 TAILQ_FOREACH(adev, &ctx->hotplug_devs, hotplug_entry) { 207 if (libusb_hotplug_filter(ctx, handle, adev, 208 LIBUSB_HOTPLUG_EVENT_DEVICE_ARRIVED) == 0) 209 continue; 210 free(handle); 211 handle = NULL; 212 break; 213 } 214 } 215 if (handle != NULL) 216 TAILQ_INSERT_TAIL(&ctx->hotplug_cbh, handle, entry); 217 HOTPLUG_UNLOCK(ctx); 218 219 if (phandle != NULL) 220 *phandle = handle; 221 return (LIBUSB_SUCCESS); 222 } 223 224 void libusb_hotplug_deregister_callback(libusb_context *ctx, 225 libusb_hotplug_callback_handle handle) 226 { 227 ctx = GET_CONTEXT(ctx); 228 229 if (ctx == NULL || handle == NULL) 230 return; 231 232 HOTPLUG_LOCK(ctx); 233 TAILQ_REMOVE(&ctx->hotplug_cbh, handle, entry); 234 HOTPLUG_UNLOCK(ctx); 235 236 free(handle); 237 } 238