1 /*- 2 * Copyright (c) 2016-2019 Hans Petter Selasky. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 1. Redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer. 9 * 2. Redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution. 12 * 13 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 14 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 16 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 17 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 18 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 19 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 20 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 21 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 22 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 23 * SUCH DAMAGE. 24 */ 25 26 #ifdef LIBUSB_GLOBAL_INCLUDE_FILE 27 #include LIBUSB_GLOBAL_INCLUDE_FILE 28 #else 29 #include <assert.h> 30 #include <errno.h> 31 #include <poll.h> 32 #include <pthread.h> 33 #include <stdio.h> 34 #include <stdlib.h> 35 #include <string.h> 36 #include <unistd.h> 37 #include <time.h> 38 #include <sys/fcntl.h> 39 #include <sys/ioctl.h> 40 #include <sys/queue.h> 41 #include <sys/endian.h> 42 #endif 43 44 #define libusb_device_handle libusb20_device 45 46 #include "libusb20.h" 47 #include "libusb20_desc.h" 48 #include "libusb20_int.h" 49 #include "libusb.h" 50 #include "libusb10.h" 51 52 static int 53 libusb_hotplug_equal(libusb_device *_adev, libusb_device *_bdev) 54 { 55 struct libusb20_device *adev = _adev->os_priv; 56 struct libusb20_device *bdev = _bdev->os_priv; 57 58 if (adev->bus_number != bdev->bus_number) 59 return (0); 60 if (adev->device_address != bdev->device_address) 61 return (0); 62 if (memcmp(&adev->ddesc, &bdev->ddesc, sizeof(adev->ddesc))) 63 return (0); 64 if (memcmp(&adev->session_data, &bdev->session_data, sizeof(adev->session_data))) 65 return (0); 66 return (1); 67 } 68 69 static int 70 libusb_hotplug_filter(libusb_context *ctx, libusb_hotplug_callback_handle pcbh, 71 libusb_device *dev, libusb_hotplug_event event) 72 { 73 if (!(pcbh->events & event)) 74 return (0); 75 if (pcbh->vendor != LIBUSB_HOTPLUG_MATCH_ANY && 76 pcbh->vendor != libusb20_dev_get_device_desc(dev->os_priv)->idVendor) 77 return (0); 78 if (pcbh->product != LIBUSB_HOTPLUG_MATCH_ANY && 79 pcbh->product != libusb20_dev_get_device_desc(dev->os_priv)->idProduct) 80 return (0); 81 if (pcbh->devclass != LIBUSB_HOTPLUG_MATCH_ANY && 82 pcbh->devclass != libusb20_dev_get_device_desc(dev->os_priv)->bDeviceClass) 83 return (0); 84 return (pcbh->fn(ctx, dev, event, pcbh->user_data)); 85 } 86 87 static int 88 libusb_hotplug_enumerate(libusb_context *ctx, struct libusb_device_head *phead) 89 { 90 libusb_device **ppdev; 91 ssize_t count; 92 ssize_t x; 93 94 count = libusb_get_device_list(ctx, &ppdev); 95 if (count < 0) 96 return (-1); 97 98 for (x = 0; x != count; x++) 99 TAILQ_INSERT_TAIL(phead, ppdev[x], hotplug_entry); 100 101 libusb_free_device_list(ppdev, 0); 102 return (0); 103 } 104 105 static void * 106 libusb_hotplug_scan(void *arg) 107 { 108 struct libusb_device_head hotplug_devs; 109 libusb_hotplug_callback_handle acbh; 110 libusb_hotplug_callback_handle bcbh; 111 libusb_context *ctx = arg; 112 libusb_device *temp; 113 libusb_device *adev; 114 libusb_device *bdev; 115 unsigned do_loop = 1; 116 117 while (do_loop) { 118 usleep(4000000); 119 120 HOTPLUG_LOCK(ctx); 121 122 TAILQ_INIT(&hotplug_devs); 123 124 if (ctx->hotplug_handler != NO_THREAD) { 125 if (libusb_hotplug_enumerate(ctx, &hotplug_devs) < 0) { 126 HOTPLUG_UNLOCK(ctx); 127 continue; 128 } 129 } else { 130 do_loop = 0; 131 } 132 133 /* figure out which devices are gone */ 134 TAILQ_FOREACH_SAFE(adev, &ctx->hotplug_devs, hotplug_entry, temp) { 135 TAILQ_FOREACH(bdev, &hotplug_devs, hotplug_entry) { 136 if (libusb_hotplug_equal(adev, bdev)) 137 break; 138 } 139 if (bdev == NULL) { 140 TAILQ_REMOVE(&ctx->hotplug_devs, adev, hotplug_entry); 141 TAILQ_FOREACH_SAFE(acbh, &ctx->hotplug_cbh, entry, bcbh) { 142 if (libusb_hotplug_filter(ctx, acbh, adev, 143 LIBUSB_HOTPLUG_EVENT_DEVICE_LEFT) == 0) 144 continue; 145 TAILQ_REMOVE(&ctx->hotplug_cbh, acbh, entry); 146 free(acbh); 147 } 148 libusb_unref_device(adev); 149 } 150 } 151 152 /* figure out which devices are new */ 153 TAILQ_FOREACH_SAFE(adev, &hotplug_devs, hotplug_entry, temp) { 154 TAILQ_FOREACH(bdev, &ctx->hotplug_devs, hotplug_entry) { 155 if (libusb_hotplug_equal(adev, bdev)) 156 break; 157 } 158 if (bdev == NULL) { 159 TAILQ_REMOVE(&hotplug_devs, adev, hotplug_entry); 160 TAILQ_INSERT_TAIL(&ctx->hotplug_devs, adev, hotplug_entry); 161 TAILQ_FOREACH_SAFE(acbh, &ctx->hotplug_cbh, entry, bcbh) { 162 if (libusb_hotplug_filter(ctx, acbh, adev, 163 LIBUSB_HOTPLUG_EVENT_DEVICE_ARRIVED) == 0) 164 continue; 165 TAILQ_REMOVE(&ctx->hotplug_cbh, acbh, entry); 166 free(acbh); 167 } 168 } 169 } 170 HOTPLUG_UNLOCK(ctx); 171 172 /* unref remaining devices */ 173 while ((adev = TAILQ_FIRST(&hotplug_devs)) != NULL) { 174 TAILQ_REMOVE(&hotplug_devs, adev, hotplug_entry); 175 libusb_unref_device(adev); 176 } 177 } 178 return (NULL); 179 } 180 181 int libusb_hotplug_register_callback(libusb_context *ctx, 182 libusb_hotplug_event events, libusb_hotplug_flag flags, 183 int vendor_id, int product_id, int dev_class, 184 libusb_hotplug_callback_fn cb_fn, void *user_data, 185 libusb_hotplug_callback_handle *phandle) 186 { 187 libusb_hotplug_callback_handle handle; 188 struct libusb_device *adev; 189 190 ctx = GET_CONTEXT(ctx); 191 192 if (ctx == NULL || cb_fn == NULL || events == 0 || 193 vendor_id < -1 || vendor_id > 0xffff || 194 product_id < -1 || product_id > 0xffff || 195 dev_class < -1 || dev_class > 0xff) 196 return (LIBUSB_ERROR_INVALID_PARAM); 197 198 handle = malloc(sizeof(*handle)); 199 if (handle == NULL) 200 return (LIBUSB_ERROR_NO_MEM); 201 202 HOTPLUG_LOCK(ctx); 203 if (ctx->hotplug_handler == NO_THREAD) { 204 libusb_hotplug_enumerate(ctx, &ctx->hotplug_devs); 205 206 if (pthread_create(&ctx->hotplug_handler, NULL, 207 &libusb_hotplug_scan, ctx) != 0) 208 ctx->hotplug_handler = NO_THREAD; 209 } 210 handle->events = events; 211 handle->vendor = vendor_id; 212 handle->product = product_id; 213 handle->devclass = dev_class; 214 handle->fn = cb_fn; 215 handle->user_data = user_data; 216 217 if (flags & LIBUSB_HOTPLUG_ENUMERATE) { 218 TAILQ_FOREACH(adev, &ctx->hotplug_devs, hotplug_entry) { 219 if (libusb_hotplug_filter(ctx, handle, adev, 220 LIBUSB_HOTPLUG_EVENT_DEVICE_ARRIVED) == 0) 221 continue; 222 free(handle); 223 handle = NULL; 224 break; 225 } 226 } 227 if (handle != NULL) 228 TAILQ_INSERT_TAIL(&ctx->hotplug_cbh, handle, entry); 229 HOTPLUG_UNLOCK(ctx); 230 231 if (phandle != NULL) 232 *phandle = handle; 233 return (LIBUSB_SUCCESS); 234 } 235 236 void libusb_hotplug_deregister_callback(libusb_context *ctx, 237 libusb_hotplug_callback_handle handle) 238 { 239 ctx = GET_CONTEXT(ctx); 240 241 if (ctx == NULL || handle == NULL) 242 return; 243 244 HOTPLUG_LOCK(ctx); 245 TAILQ_REMOVE(&ctx->hotplug_cbh, handle, entry); 246 HOTPLUG_UNLOCK(ctx); 247 248 free(handle); 249 } 250