1 /* 2 * Copyright (C) 2015-2016 Samsung Electronics 3 * Igor Kotrasinski <i.kotrasinsk@samsung.com> 4 * Krzysztof Opasiak <k.opasiak@samsung.com> 5 * 6 * Refactored from usbip_host_driver.c, which is: 7 * Copyright (C) 2011 matt mooney <mfm@muteddisk.com> 8 * 2005-2007 Takahiro Hirofuchi 9 * 10 * This program is free software: you can redistribute it and/or modify 11 * it under the terms of the GNU General Public License as published by 12 * the Free Software Foundation, either version 2 of the License, or 13 * (at your option) any later version. 14 * 15 * This program is distributed in the hope that it will be useful, 16 * but WITHOUT ANY WARRANTY; without even the implied warranty of 17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 18 * GNU General Public License for more details. 19 * 20 * You should have received a copy of the GNU General Public License 21 * along with this program. If not, see <http://www.gnu.org/licenses/>. 22 */ 23 24 #include <sys/types.h> 25 #include <sys/stat.h> 26 #include <fcntl.h> 27 28 #include <errno.h> 29 #include <unistd.h> 30 31 #include <libudev.h> 32 33 #include "usbip_common.h" 34 #include "usbip_host_common.h" 35 #include "list.h" 36 #include "sysfs_utils.h" 37 38 struct udev *udev_context; 39 40 static int32_t read_attr_usbip_status(struct usbip_usb_device *udev) 41 { 42 char status_attr_path[SYSFS_PATH_MAX]; 43 int fd; 44 int length; 45 char status; 46 int value = 0; 47 48 snprintf(status_attr_path, SYSFS_PATH_MAX, "%s/usbip_status", 49 udev->path); 50 51 fd = open(status_attr_path, O_RDONLY); 52 if (fd < 0) { 53 err("error opening attribute %s", status_attr_path); 54 return -1; 55 } 56 57 length = read(fd, &status, 1); 58 if (length < 0) { 59 err("error reading attribute %s", status_attr_path); 60 close(fd); 61 return -1; 62 } 63 64 value = atoi(&status); 65 66 return value; 67 } 68 69 static 70 struct usbip_exported_device *usbip_exported_device_new( 71 struct usbip_host_driver *hdriver, const char *sdevpath) 72 { 73 struct usbip_exported_device *edev = NULL; 74 struct usbip_exported_device *edev_old; 75 size_t size; 76 int i; 77 78 edev = calloc(1, sizeof(struct usbip_exported_device)); 79 80 edev->sudev = 81 udev_device_new_from_syspath(udev_context, sdevpath); 82 if (!edev->sudev) { 83 err("udev_device_new_from_syspath: %s", sdevpath); 84 goto err; 85 } 86 87 if (hdriver->ops.read_device(edev->sudev, &edev->udev) < 0) 88 goto err; 89 90 edev->status = read_attr_usbip_status(&edev->udev); 91 if (edev->status < 0) 92 goto err; 93 94 /* reallocate buffer to include usb interface data */ 95 size = sizeof(struct usbip_exported_device) + 96 edev->udev.bNumInterfaces * sizeof(struct usbip_usb_interface); 97 98 edev_old = edev; 99 edev = realloc(edev, size); 100 if (!edev) { 101 edev = edev_old; 102 dbg("realloc failed"); 103 goto err; 104 } 105 106 for (i = 0; i < edev->udev.bNumInterfaces; i++) { 107 /* vudc does not support reading interfaces */ 108 if (!hdriver->ops.read_interface) 109 break; 110 hdriver->ops.read_interface(&edev->udev, i, &edev->uinf[i]); 111 } 112 113 return edev; 114 err: 115 if (edev->sudev) 116 udev_device_unref(edev->sudev); 117 if (edev) 118 free(edev); 119 120 return NULL; 121 } 122 123 static int refresh_exported_devices(struct usbip_host_driver *hdriver) 124 { 125 struct usbip_exported_device *edev; 126 struct udev_enumerate *enumerate; 127 struct udev_list_entry *devices, *dev_list_entry; 128 struct udev_device *dev; 129 const char *path; 130 131 enumerate = udev_enumerate_new(udev_context); 132 udev_enumerate_add_match_subsystem(enumerate, hdriver->udev_subsystem); 133 udev_enumerate_scan_devices(enumerate); 134 135 devices = udev_enumerate_get_list_entry(enumerate); 136 137 udev_list_entry_foreach(dev_list_entry, devices) { 138 path = udev_list_entry_get_name(dev_list_entry); 139 dev = udev_device_new_from_syspath(udev_context, 140 path); 141 if (dev == NULL) 142 continue; 143 144 /* Check whether device uses usbip driver. */ 145 if (hdriver->ops.is_my_device(dev)) { 146 edev = usbip_exported_device_new(hdriver, path); 147 if (!edev) { 148 dbg("usbip_exported_device_new failed"); 149 continue; 150 } 151 152 list_add(&edev->node, &hdriver->edev_list); 153 hdriver->ndevs++; 154 } 155 } 156 157 return 0; 158 } 159 160 static void usbip_exported_device_destroy(struct list_head *devs) 161 { 162 struct list_head *i, *tmp; 163 struct usbip_exported_device *edev; 164 165 list_for_each_safe(i, tmp, devs) { 166 edev = list_entry(i, struct usbip_exported_device, node); 167 list_del(i); 168 free(edev); 169 } 170 } 171 172 int usbip_generic_driver_open(struct usbip_host_driver *hdriver) 173 { 174 int rc; 175 176 udev_context = udev_new(); 177 if (!udev_context) { 178 err("udev_new failed"); 179 return -1; 180 } 181 182 rc = refresh_exported_devices(hdriver); 183 if (rc < 0) 184 goto err; 185 return 0; 186 err: 187 udev_unref(udev_context); 188 return -1; 189 } 190 191 void usbip_generic_driver_close(struct usbip_host_driver *hdriver) 192 { 193 if (!hdriver) 194 return; 195 196 usbip_exported_device_destroy(&hdriver->edev_list); 197 198 udev_unref(udev_context); 199 } 200 201 int usbip_generic_refresh_device_list(struct usbip_host_driver *hdriver) 202 { 203 int rc; 204 205 usbip_exported_device_destroy(&hdriver->edev_list); 206 207 hdriver->ndevs = 0; 208 INIT_LIST_HEAD(&hdriver->edev_list); 209 210 rc = refresh_exported_devices(hdriver); 211 if (rc < 0) 212 return -1; 213 214 return 0; 215 } 216 217 int usbip_export_device(struct usbip_exported_device *edev, int sockfd) 218 { 219 char attr_name[] = "usbip_sockfd"; 220 char sockfd_attr_path[SYSFS_PATH_MAX]; 221 char sockfd_buff[30]; 222 int ret; 223 224 if (edev->status != SDEV_ST_AVAILABLE) { 225 dbg("device not available: %s", edev->udev.busid); 226 switch (edev->status) { 227 case SDEV_ST_ERROR: 228 dbg("status SDEV_ST_ERROR"); 229 break; 230 case SDEV_ST_USED: 231 dbg("status SDEV_ST_USED"); 232 break; 233 default: 234 dbg("status unknown: 0x%x", edev->status); 235 } 236 return -1; 237 } 238 239 /* only the first interface is true */ 240 snprintf(sockfd_attr_path, sizeof(sockfd_attr_path), "%s/%s", 241 edev->udev.path, attr_name); 242 243 snprintf(sockfd_buff, sizeof(sockfd_buff), "%d\n", sockfd); 244 245 ret = write_sysfs_attribute(sockfd_attr_path, sockfd_buff, 246 strlen(sockfd_buff)); 247 if (ret < 0) { 248 err("write_sysfs_attribute failed: sockfd %s to %s", 249 sockfd_buff, sockfd_attr_path); 250 return ret; 251 } 252 253 info("connect: %s", edev->udev.busid); 254 255 return ret; 256 } 257 258 struct usbip_exported_device *usbip_generic_get_device( 259 struct usbip_host_driver *hdriver, int num) 260 { 261 struct list_head *i; 262 struct usbip_exported_device *edev; 263 int cnt = 0; 264 265 list_for_each(i, &hdriver->edev_list) { 266 edev = list_entry(i, struct usbip_exported_device, node); 267 if (num == cnt) 268 return edev; 269 cnt++; 270 } 271 272 return NULL; 273 } 274