1 /* 2 * Copyright (C) 2008 The Android Open Source Project 3 * 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 * * Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * * Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in 12 * the documentation and/or other materials provided with the 13 * distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 16 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 17 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 18 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 19 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 21 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS 22 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 23 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 24 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 25 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 #include <stdio.h> 30 #include <stdlib.h> 31 #include <unistd.h> 32 #include <string.h> 33 34 #include <sys/ioctl.h> 35 #include <sys/types.h> 36 #include <dirent.h> 37 #include <fcntl.h> 38 #include <errno.h> 39 #include <pthread.h> 40 #include <ctype.h> 41 42 #include <linux/usbdevice_fs.h> 43 #include <linux/usbdevice_fs.h> 44 #include <linux/version.h> 45 #if LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 20) 46 #include <linux/usb/ch9.h> 47 #else 48 #include <linux/usb_ch9.h> 49 #endif 50 #include <asm/byteorder.h> 51 52 #include "usb.h" 53 54 #define MAX_RETRIES 5 55 56 #ifdef TRACE_USB 57 #define DBG1(x...) fprintf(stderr, x) 58 #define DBG(x...) fprintf(stderr, x) 59 #else 60 #define DBG(x...) 61 #define DBG1(x...) 62 #endif 63 64 /* The max bulk size for linux is 16384 which is defined 65 * in drivers/usb/core/devio.c. 66 */ 67 #define MAX_USBFS_BULK_SIZE (16 * 1024) 68 69 struct usb_handle 70 { 71 char fname[64]; 72 int desc; 73 unsigned char ep_in; 74 unsigned char ep_out; 75 }; 76 77 static inline int badname(const char *name) 78 { 79 while(*name) { 80 if(!isdigit(*name++)) return 1; 81 } 82 return 0; 83 } 84 85 static int check(void *_desc, int len, unsigned type, int size) 86 { 87 unsigned char *desc = _desc; 88 89 if(len < size) return -1; 90 if(desc[0] < size) return -1; 91 if(desc[0] > len) return -1; 92 if(desc[1] != type) return -1; 93 94 return 0; 95 } 96 97 static int filter_usb_device(int fd, char *ptr, int len, int writable, 98 ifc_match_func callback, 99 int *ept_in_id, int *ept_out_id, int *ifc_id) 100 { 101 struct usb_device_descriptor *dev; 102 struct usb_config_descriptor *cfg; 103 struct usb_interface_descriptor *ifc; 104 struct usb_endpoint_descriptor *ept; 105 struct usb_ifc_info info; 106 107 int in, out; 108 unsigned i; 109 unsigned e; 110 111 if(check(ptr, len, USB_DT_DEVICE, USB_DT_DEVICE_SIZE)) 112 return -1; 113 dev = (void*) ptr; 114 len -= dev->bLength; 115 ptr += dev->bLength; 116 117 if(check(ptr, len, USB_DT_CONFIG, USB_DT_CONFIG_SIZE)) 118 return -1; 119 cfg = (void*) ptr; 120 len -= cfg->bLength; 121 ptr += cfg->bLength; 122 123 info.dev_vendor = dev->idVendor; 124 info.dev_product = dev->idProduct; 125 info.dev_class = dev->bDeviceClass; 126 info.dev_subclass = dev->bDeviceSubClass; 127 info.dev_protocol = dev->bDeviceProtocol; 128 info.writable = writable; 129 130 // read device serial number (if there is one) 131 info.serial_number[0] = 0; 132 if (dev->iSerialNumber) { 133 struct usbdevfs_ctrltransfer ctrl; 134 __u16 buffer[128]; 135 int result; 136 137 memset(buffer, 0, sizeof(buffer)); 138 139 ctrl.bRequestType = USB_DIR_IN|USB_TYPE_STANDARD|USB_RECIP_DEVICE; 140 ctrl.bRequest = USB_REQ_GET_DESCRIPTOR; 141 ctrl.wValue = (USB_DT_STRING << 8) | dev->iSerialNumber; 142 ctrl.wIndex = 0; 143 ctrl.wLength = sizeof(buffer); 144 ctrl.data = buffer; 145 ctrl.timeout = 50; 146 147 result = ioctl(fd, USBDEVFS_CONTROL, &ctrl); 148 if (result > 0) { 149 int i; 150 // skip first word, and copy the rest to the serial string, changing shorts to bytes. 151 result /= 2; 152 for (i = 1; i < result; i++) 153 info.serial_number[i - 1] = buffer[i]; 154 info.serial_number[i - 1] = 0; 155 } 156 } 157 158 for(i = 0; i < cfg->bNumInterfaces; i++) { 159 if(check(ptr, len, USB_DT_INTERFACE, USB_DT_INTERFACE_SIZE)) 160 return -1; 161 ifc = (void*) ptr; 162 len -= ifc->bLength; 163 ptr += ifc->bLength; 164 165 in = -1; 166 out = -1; 167 info.ifc_class = ifc->bInterfaceClass; 168 info.ifc_subclass = ifc->bInterfaceSubClass; 169 info.ifc_protocol = ifc->bInterfaceProtocol; 170 171 for(e = 0; e < ifc->bNumEndpoints; e++) { 172 if(check(ptr, len, USB_DT_ENDPOINT, USB_DT_ENDPOINT_SIZE)) 173 return -1; 174 ept = (void*) ptr; 175 len -= ept->bLength; 176 ptr += ept->bLength; 177 178 if((ept->bmAttributes & 0x03) != 0x02) 179 continue; 180 181 if(ept->bEndpointAddress & 0x80) { 182 in = ept->bEndpointAddress; 183 } else { 184 out = ept->bEndpointAddress; 185 } 186 } 187 188 info.has_bulk_in = (in != -1); 189 info.has_bulk_out = (out != -1); 190 191 if(callback(&info) == 0) { 192 *ept_in_id = in; 193 *ept_out_id = out; 194 *ifc_id = ifc->bInterfaceNumber; 195 return 0; 196 } 197 } 198 199 return -1; 200 } 201 202 static usb_handle *find_usb_device(const char *base, ifc_match_func callback) 203 { 204 usb_handle *usb = 0; 205 char busname[64], devname[64]; 206 char desc[1024]; 207 int n, in, out, ifc; 208 209 DIR *busdir, *devdir; 210 struct dirent *de; 211 int fd; 212 int writable; 213 214 busdir = opendir(base); 215 if(busdir == 0) return 0; 216 217 while((de = readdir(busdir)) && (usb == 0)) { 218 if(badname(de->d_name)) continue; 219 220 sprintf(busname, "%s/%s", base, de->d_name); 221 devdir = opendir(busname); 222 if(devdir == 0) continue; 223 224 // DBG("[ scanning %s ]\n", busname); 225 while((de = readdir(devdir)) && (usb == 0)) { 226 227 if(badname(de->d_name)) continue; 228 sprintf(devname, "%s/%s", busname, de->d_name); 229 230 // DBG("[ scanning %s ]\n", devname); 231 writable = 1; 232 if((fd = open(devname, O_RDWR)) < 0) { 233 // Check if we have read-only access, so we can give a helpful 234 // diagnostic like "adb devices" does. 235 writable = 0; 236 if((fd = open(devname, O_RDONLY)) < 0) { 237 continue; 238 } 239 } 240 241 n = read(fd, desc, sizeof(desc)); 242 243 if(filter_usb_device(fd, desc, n, writable, callback, 244 &in, &out, &ifc) == 0) { 245 usb = calloc(1, sizeof(usb_handle)); 246 strcpy(usb->fname, devname); 247 usb->ep_in = in; 248 usb->ep_out = out; 249 usb->desc = fd; 250 251 n = ioctl(fd, USBDEVFS_CLAIMINTERFACE, &ifc); 252 if(n != 0) { 253 close(fd); 254 free(usb); 255 usb = 0; 256 continue; 257 } 258 } else { 259 close(fd); 260 } 261 } 262 closedir(devdir); 263 } 264 closedir(busdir); 265 266 return usb; 267 } 268 269 int usb_write(usb_handle *h, const void *_data, int len) 270 { 271 unsigned char *data = (unsigned char*) _data; 272 unsigned count = 0; 273 struct usbdevfs_bulktransfer bulk; 274 int n; 275 276 if(h->ep_out == 0) { 277 return -1; 278 } 279 280 if(len == 0) { 281 bulk.ep = h->ep_out; 282 bulk.len = 0; 283 bulk.data = data; 284 bulk.timeout = 0; 285 286 n = ioctl(h->desc, USBDEVFS_BULK, &bulk); 287 if(n != 0) { 288 fprintf(stderr,"ERROR: n = %d, errno = %d (%s)\n", 289 n, errno, strerror(errno)); 290 return -1; 291 } 292 return 0; 293 } 294 295 while(len > 0) { 296 int xfer; 297 xfer = (len > MAX_USBFS_BULK_SIZE) ? MAX_USBFS_BULK_SIZE : len; 298 299 bulk.ep = h->ep_out; 300 bulk.len = xfer; 301 bulk.data = data; 302 bulk.timeout = 0; 303 304 n = ioctl(h->desc, USBDEVFS_BULK, &bulk); 305 if(n != xfer) { 306 DBG("ERROR: n = %d, errno = %d (%s)\n", 307 n, errno, strerror(errno)); 308 return -1; 309 } 310 311 count += xfer; 312 len -= xfer; 313 data += xfer; 314 } 315 316 return count; 317 } 318 319 int usb_read(usb_handle *h, void *_data, int len) 320 { 321 unsigned char *data = (unsigned char*) _data; 322 unsigned count = 0; 323 struct usbdevfs_bulktransfer bulk; 324 int n, retry; 325 326 if(h->ep_in == 0) { 327 return -1; 328 } 329 330 while(len > 0) { 331 int xfer = (len > MAX_USBFS_BULK_SIZE) ? MAX_USBFS_BULK_SIZE : len; 332 333 bulk.ep = h->ep_in; 334 bulk.len = xfer; 335 bulk.data = data; 336 bulk.timeout = 0; 337 retry = 0; 338 339 do{ 340 DBG("[ usb read %d fd = %d], fname=%s\n", xfer, h->desc, h->fname); 341 n = ioctl(h->desc, USBDEVFS_BULK, &bulk); 342 DBG("[ usb read %d ] = %d, fname=%s, Retry %d \n", xfer, n, h->fname, retry); 343 344 if( n < 0 ) { 345 DBG1("ERROR: n = %d, errno = %d (%s)\n",n, errno, strerror(errno)); 346 if ( ++retry > MAX_RETRIES ) return -1; 347 sleep( 1 ); 348 } 349 } 350 while( n < 0 ); 351 352 count += n; 353 len -= n; 354 data += n; 355 356 if(n < xfer) { 357 break; 358 } 359 } 360 361 return count; 362 } 363 364 void usb_kick(usb_handle *h) 365 { 366 int fd; 367 368 fd = h->desc; 369 h->desc = -1; 370 if(fd >= 0) { 371 close(fd); 372 DBG("[ usb closed %d ]\n", fd); 373 } 374 } 375 376 int usb_close(usb_handle *h) 377 { 378 int fd; 379 380 fd = h->desc; 381 h->desc = -1; 382 if(fd >= 0) { 383 close(fd); 384 DBG("[ usb closed %d ]\n", fd); 385 } 386 387 return 0; 388 } 389 390 usb_handle *usb_open(ifc_match_func callback) 391 { 392 return find_usb_device("/dev/bus/usb", callback); 393 } 394
