Harald Welte | 822d66e | 2017-03-06 20:58:03 +0100 | [diff] [blame] | 1 | #include <errno.h> |
| 2 | #include <unistd.h> |
| 3 | #include <stdio.h> |
| 4 | #include <stdlib.h> |
| 5 | #include <stdint.h> |
Harald Welte | a601635 | 2017-05-11 01:31:45 +0200 | [diff] [blame] | 6 | #include <string.h> |
Harald Welte | 822d66e | 2017-03-06 20:58:03 +0100 | [diff] [blame] | 7 | |
| 8 | #include <libusb.h> |
| 9 | |
| 10 | #include "libusb_util.h" |
| 11 | |
Harald Welte | a601635 | 2017-05-11 01:31:45 +0200 | [diff] [blame] | 12 | static char path_buf[USB_MAX_PATH_LEN]; |
| 13 | |
| 14 | static char *get_path(libusb_device *dev) |
| 15 | { |
| 16 | #if (defined(LIBUSB_API_VERSION) && LIBUSB_API_VERSION >= 0x01000102) || (defined(LIBUSBX_API_VERSION) && LIBUSBX_API_VERSION >= 0x01000102) |
| 17 | uint8_t path[8]; |
| 18 | int r,j; |
| 19 | r = libusb_get_port_numbers(dev, path, sizeof(path)); |
| 20 | if (r > 0) { |
| 21 | sprintf(path_buf,"%d-%d",libusb_get_bus_number(dev),path[0]); |
| 22 | for (j = 1; j < r; j++){ |
| 23 | sprintf(path_buf+strlen(path_buf),".%d",path[j]); |
| 24 | }; |
| 25 | } |
| 26 | return path_buf; |
| 27 | #else |
| 28 | # warning "libusb too old - building without USB path support!" |
| 29 | return NULL; |
| 30 | #endif |
| 31 | } |
| 32 | |
Harald Welte | 822d66e | 2017-03-06 20:58:03 +0100 | [diff] [blame] | 33 | static int match_dev_id(const struct libusb_device_descriptor *desc, const struct dev_id *id) |
| 34 | { |
| 35 | if ((desc->idVendor == id->vendor_id) && (desc->idProduct == id->product_id)) |
| 36 | return 1; |
| 37 | return 0; |
| 38 | } |
| 39 | |
| 40 | |
| 41 | static int match_dev_ids(const struct libusb_device_descriptor *desc, const struct dev_id *ids) |
| 42 | { |
| 43 | const struct dev_id *id; |
| 44 | |
| 45 | for (id = ids; id->vendor_id || id->product_id; id++) { |
| 46 | if (match_dev_id(desc, id)) |
| 47 | return 1; |
| 48 | } |
| 49 | return 0; |
| 50 | } |
| 51 | |
| 52 | libusb_device **find_matching_usb_devs(const struct dev_id *dev_ids) |
| 53 | { |
| 54 | libusb_device **list; |
| 55 | libusb_device **out = calloc(256, sizeof(libusb_device *)); |
| 56 | libusb_device **cur = out; |
| 57 | unsigned int i; |
| 58 | int rc; |
| 59 | |
| 60 | if (!out) |
| 61 | return NULL; |
| 62 | |
| 63 | rc = libusb_get_device_list(NULL, &list); |
| 64 | if (rc <= 0) { |
| 65 | perror("No USB devices found"); |
| 66 | free(out); |
| 67 | return NULL; |
| 68 | } |
| 69 | |
| 70 | for (i = 0; list[i] != NULL; i++) { |
| 71 | struct libusb_device_descriptor dev_desc; |
| 72 | libusb_device *dev = list[i]; |
| 73 | |
| 74 | rc = libusb_get_device_descriptor(dev, &dev_desc); |
| 75 | if (rc < 0) { |
| 76 | perror("Couldn't get device descriptor\n"); |
| 77 | libusb_unref_device(dev); |
| 78 | continue; |
| 79 | } |
| 80 | |
| 81 | if (match_dev_ids(&dev_desc, dev_ids)) { |
| 82 | *cur = dev; |
| 83 | cur++; |
| 84 | /* FIXME: overflow check */ |
| 85 | } else |
| 86 | libusb_unref_device(dev); |
| 87 | } |
| 88 | if (cur == out) { |
| 89 | libusb_free_device_list(list, 1); |
| 90 | free(out); |
| 91 | return NULL; |
| 92 | } |
| 93 | |
| 94 | libusb_free_device_list(list, 0); |
| 95 | return out; |
| 96 | } |
| 97 | |
| 98 | int dev_find_matching_interfaces(libusb_device *dev, int class, int sub_class, int protocol, |
| 99 | struct usb_interface_match *out, unsigned int out_len) |
| 100 | { |
| 101 | struct libusb_device_descriptor dev_desc; |
| 102 | int rc, i, out_idx = 0; |
| 103 | uint8_t addr; |
Harald Welte | a601635 | 2017-05-11 01:31:45 +0200 | [diff] [blame] | 104 | char *path; |
Harald Welte | 822d66e | 2017-03-06 20:58:03 +0100 | [diff] [blame] | 105 | |
| 106 | rc = libusb_get_device_descriptor(dev, &dev_desc); |
| 107 | if (rc < 0) { |
| 108 | perror("Couldn't get device descriptor\n"); |
| 109 | return -EIO; |
| 110 | } |
| 111 | |
| 112 | addr = libusb_get_device_address(dev); |
Harald Welte | a601635 | 2017-05-11 01:31:45 +0200 | [diff] [blame] | 113 | path = get_path(dev); |
Harald Welte | 822d66e | 2017-03-06 20:58:03 +0100 | [diff] [blame] | 114 | |
| 115 | /* iterate over all configurations */ |
| 116 | for (i = 0; i < dev_desc.bNumConfigurations; i++) { |
| 117 | struct libusb_config_descriptor *conf_desc; |
| 118 | int j; |
| 119 | |
| 120 | rc = libusb_get_config_descriptor(dev, i, &conf_desc); |
| 121 | if (rc < 0) { |
| 122 | fprintf(stderr, "Couldn't get config descriptor %u\n", i); |
| 123 | continue; |
| 124 | } |
| 125 | /* iterate over all interfaces */ |
| 126 | for (j = 0; j < conf_desc->bNumInterfaces; j++) { |
| 127 | const struct libusb_interface *intf = &conf_desc->interface[j]; |
| 128 | int k; |
| 129 | /* iterate over all alternate settings */ |
| 130 | for (k = 0; k < intf->num_altsetting; k++) { |
| 131 | const struct libusb_interface_descriptor *if_desc; |
| 132 | if_desc = &intf->altsetting[k]; |
| 133 | if (class > 0 && if_desc->bInterfaceClass != class) |
| 134 | continue; |
| 135 | if (sub_class > 0 && if_desc->bInterfaceSubClass != sub_class) |
| 136 | continue; |
| 137 | if (protocol > 0 && if_desc->bInterfaceProtocol != protocol) |
| 138 | continue; |
| 139 | /* MATCH! */ |
| 140 | out[out_idx].usb_dev = dev; |
| 141 | out[out_idx].vendor = dev_desc.idVendor; |
| 142 | out[out_idx].product = dev_desc.idProduct; |
| 143 | out[out_idx].addr = addr; |
Harald Welte | a601635 | 2017-05-11 01:31:45 +0200 | [diff] [blame] | 144 | strncpy(out[out_idx].path, path, sizeof(out[out_idx].path)); |
| 145 | out[out_idx].path[sizeof(out[out_idx].path)-1] = '\0'; |
Harald Welte | 822d66e | 2017-03-06 20:58:03 +0100 | [diff] [blame] | 146 | out[out_idx].configuration = conf_desc->bConfigurationValue; |
| 147 | out[out_idx].interface = if_desc->bInterfaceNumber; |
| 148 | out[out_idx].altsetting = if_desc->bAlternateSetting; |
| 149 | out[out_idx].class = if_desc->bInterfaceClass; |
| 150 | out[out_idx].sub_class = if_desc->bInterfaceSubClass; |
| 151 | out[out_idx].protocol = if_desc->bInterfaceProtocol; |
| 152 | out[out_idx].string_idx = if_desc->iInterface; |
| 153 | out_idx++; |
| 154 | if (out_idx >= out_len) |
| 155 | return out_idx; |
| 156 | } |
| 157 | } |
| 158 | } |
| 159 | return out_idx; |
| 160 | } |
| 161 | |
| 162 | int usb_match_interfaces(libusb_context *ctx, const struct dev_id *dev_ids, |
| 163 | int class, int sub_class, int protocol, |
| 164 | struct usb_interface_match *out, unsigned int out_len) |
| 165 | { |
| 166 | struct usb_interface_match *out_cur = out; |
| 167 | unsigned int out_len_remain = out_len; |
| 168 | libusb_device **list; |
| 169 | libusb_device **dev; |
| 170 | |
| 171 | list = find_matching_usb_devs(dev_ids); |
| 172 | if (!list) |
| 173 | return 0; |
| 174 | |
| 175 | for (dev = list; *dev; dev++) { |
| 176 | int rc; |
| 177 | |
| 178 | #if 0 |
| 179 | struct libusb_device_descriptor dev_desc; |
| 180 | uint8_t ports[8]; |
| 181 | uint8_t addr; |
| 182 | rc = libusb_get_device_descriptor(*dev, &dev_desc); |
| 183 | if (rc < 0) { |
| 184 | perror("Cannot get device descriptor"); |
| 185 | continue; |
| 186 | } |
| 187 | |
| 188 | addr = libusb_get_device_address(*dev); |
| 189 | |
| 190 | rc = libusb_get_port_numbers(*dev, ports, sizeof(ports)); |
| 191 | if (rc < 0) { |
| 192 | perror("Cannot get device path"); |
| 193 | continue; |
| 194 | } |
| 195 | |
| 196 | printf("Found USB Device %04x:%04x at address %d\n", |
| 197 | dev_desc.idVendor, dev_desc.idProduct, addr); |
| 198 | #endif |
| 199 | |
| 200 | rc = dev_find_matching_interfaces(*dev, 255, 2, -1, out_cur, out_len_remain); |
| 201 | if (rc < 0) |
| 202 | continue; |
| 203 | out_cur += rc; |
| 204 | out_len_remain -= rc; |
| 205 | |
| 206 | } |
| 207 | return out_len - out_len_remain; |
| 208 | } |
| 209 | |
| 210 | libusb_device_handle *usb_open_claim_interface(libusb_context *ctx, |
| 211 | const struct usb_interface_match *ifm) |
| 212 | { |
| 213 | int rc, config; |
| 214 | struct dev_id dev_ids[] = { { ifm->vendor, ifm->product }, { 0, 0 } }; |
| 215 | libusb_device **list; |
| 216 | libusb_device **dev; |
| 217 | libusb_device_handle *usb_devh = NULL; |
| 218 | |
| 219 | list = find_matching_usb_devs(dev_ids); |
| 220 | if (!list) { |
| 221 | perror("No USB device with matching VID/PID"); |
| 222 | return NULL; |
| 223 | } |
| 224 | |
| 225 | for (dev = list; *dev; dev++) { |
| 226 | int addr; |
Harald Welte | a601635 | 2017-05-11 01:31:45 +0200 | [diff] [blame] | 227 | char *path; |
Harald Welte | 822d66e | 2017-03-06 20:58:03 +0100 | [diff] [blame] | 228 | |
| 229 | addr = libusb_get_device_address(*dev); |
Harald Welte | a601635 | 2017-05-11 01:31:45 +0200 | [diff] [blame] | 230 | path = get_path(*dev); |
| 231 | if ((ifm->addr && addr == ifm->addr) || |
| 232 | (strlen(ifm->path) && !strcmp(path, ifm->path))) { |
Harald Welte | 822d66e | 2017-03-06 20:58:03 +0100 | [diff] [blame] | 233 | rc = libusb_open(*dev, &usb_devh); |
| 234 | if (rc < 0) { |
| 235 | perror("Cannot open device"); |
| 236 | break; |
| 237 | } |
| 238 | rc = libusb_get_configuration(usb_devh, &config); |
| 239 | if (rc < 0) { |
| 240 | perror("Cannot get current configuration"); |
| 241 | libusb_close(usb_devh); |
| 242 | break; |
| 243 | } |
| 244 | if (config != ifm->configuration) { |
| 245 | rc = libusb_set_configuration(usb_devh, ifm->configuration); |
| 246 | if (rc < 0) { |
| 247 | perror("Cannot set configuration"); |
| 248 | libusb_close(usb_devh); |
| 249 | break; |
| 250 | } |
| 251 | } |
| 252 | rc = libusb_claim_interface(usb_devh, ifm->interface); |
| 253 | if (rc < 0) { |
| 254 | perror("Cannot claim interface"); |
| 255 | libusb_close(usb_devh); |
| 256 | break; |
| 257 | } |
| 258 | rc = libusb_set_interface_alt_setting(usb_devh, ifm->interface, ifm->altsetting); |
| 259 | if (rc < 0) { |
| 260 | perror("Cannot set interface altsetting"); |
| 261 | libusb_release_interface(usb_devh, ifm->interface); |
| 262 | libusb_close(usb_devh); |
| 263 | break; |
| 264 | } |
| 265 | } |
| 266 | } |
| 267 | |
| 268 | /* unref / free list */ |
| 269 | for (dev = list; *dev; dev++) |
| 270 | libusb_unref_device(*dev); |
| 271 | free(list); |
| 272 | |
| 273 | return usb_devh; |
| 274 | } |