USBHostMSD.cpp

00001 /* mbed USBHost Library
00002  * Copyright (c) 2006-2013 ARM Limited
00003  *
00004  * Licensed under the Apache License, Version 2.0 (the "License");
00005  * you may not use this file except in compliance with the License.
00006  * You may obtain a copy of the License at
00007  *
00008  *     http://www.apache.org/licenses/LICENSE-2.0
00009  *
00010  * Unless required by applicable law or agreed to in writing, software
00011  * distributed under the License is distributed on an "AS IS" BASIS,
00012  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
00013  * See the License for the specific language governing permissions and
00014  * limitations under the License.
00015  */
00016 
00017 #include "USBHostMSD.h"
00018 
00019 #if USBHOST_MSD
00020 #include "dbg.h"
00021 
00022 #define CBW_SIGNATURE   0x43425355
00023 #define CSW_SIGNATURE   0x53425355
00024 
00025 #define DEVICE_TO_HOST  0x80
00026 #define HOST_TO_DEVICE  0x00
00027 
00028 #define GET_MAX_LUN             (0xFE)
00029 #define BO_MASS_STORAGE_RESET   (0xFF)
00030 
00031 USBHostMSD::USBHostMSD()
00032 {
00033     host = USBHost::getHostInst();
00034     /*  register an object in FAT */
00035 
00036     init_usb();
00037 }
00038 
00039 void USBHostMSD::init_usb()
00040 {
00041     dev_connected = false;
00042     dev = NULL;
00043     bulk_in = NULL;
00044     bulk_out = NULL;
00045     dev_connected = false;
00046     blockSize = 0;
00047     blockCount = 0;
00048     msd_intf = -1;
00049     msd_device_found = false;
00050     disk_init = false;
00051     dev_connected = false;
00052     nb_ep = 0;
00053 }
00054 
00055 
00056 bool USBHostMSD::connected()
00057 {
00058     return dev_connected;
00059 }
00060 
00061 bool USBHostMSD::connect()
00062 {
00063 
00064     if (dev_connected) {
00065         return true;
00066     }
00067 
00068     for (uint8_t i = 0; i < MAX_DEVICE_CONNECTED; i++) {
00069         if ((dev = host->getDevice(i)) != NULL) {
00070 
00071             USB_DBG("Trying to connect MSD device\r\n");
00072 
00073             if(host->enumerate(dev, this))
00074                 break;
00075 
00076             if (msd_device_found) {
00077                 /* As this is done in a specific thread
00078                  * this lock is taken to avoid to process a disconnection in
00079                  * usb process during the device registering */
00080                 USBHost::Lock  Lock(host);
00081 
00082                 bulk_in = dev->getEndpoint(msd_intf, BULK_ENDPOINT, IN);
00083                 bulk_out = dev->getEndpoint(msd_intf, BULK_ENDPOINT, OUT);
00084 
00085                 if (!bulk_in || !bulk_out)
00086                     continue;
00087 
00088                 USB_INFO("New MSD device: VID:%04x PID:%04x [dev: %p - intf: %d]", dev->getVid(), dev->getPid(), dev, msd_intf);
00089                 dev->setName("MSD", msd_intf);
00090                 host->registerDriver(dev, msd_intf, this, &USBHostMSD::init_usb);
00091 
00092                 dev_connected = true;
00093                 return true;
00094             }
00095         } //if()
00096     } //for()
00097     init_usb();
00098     return false;
00099 }
00100 
00101 /*virtual*/ void USBHostMSD::setVidPid(uint16_t vid, uint16_t pid)
00102 {
00103     // we don't check VID/PID for MSD driver
00104 }
00105 
00106 /*virtual*/ bool USBHostMSD::parseInterface(uint8_t intf_nb, uint8_t intf_class, uint8_t intf_subclass, uint8_t intf_protocol) //Must return true if the interface should be parsed
00107 {
00108     if ((msd_intf == -1) &&
00109             (intf_class == MSD_CLASS) &&
00110             (intf_subclass == 0x06) &&
00111             (intf_protocol == 0x50)) {
00112         msd_intf = intf_nb;
00113         return true;
00114     }
00115     return false;
00116 }
00117 
00118 /*virtual*/ bool USBHostMSD::useEndpoint(uint8_t intf_nb, ENDPOINT_TYPE type, ENDPOINT_DIRECTION dir) //Must return true if the endpoint will be used
00119 {
00120     if (intf_nb == msd_intf) {
00121         if (type == BULK_ENDPOINT) {
00122             nb_ep++;
00123             if (nb_ep == 2)
00124                 msd_device_found = true;
00125             return true;
00126         }
00127     }
00128     return false;
00129 }
00130 
00131 
00132 int USBHostMSD::testUnitReady()
00133 {
00134     USB_DBG("Test unit ready");
00135     return SCSITransfer(NULL, 6, DEVICE_TO_HOST, 0, 0);
00136 }
00137 
00138 
00139 int USBHostMSD::readCapacity()
00140 {
00141     USB_DBG("Read capacity");
00142     uint8_t cmd[10] = {0x25,0,0,0,0,0,0,0,0,0};
00143     uint8_t result[8];
00144     int status = SCSITransfer(cmd, 10, DEVICE_TO_HOST, result, 8);
00145     if (status == 0) {
00146         blockCount = (result[0] << 24) | (result[1] << 16) | (result[2] << 8) | result[3];
00147         blockSize = (result[4] << 24) | (result[5] << 16) | (result[6] << 8) | result[7];
00148         USB_INFO("MSD [dev: %p] - blockCount: %u, blockSize: %d, Capacity: %d\r\n", dev, blockCount, blockSize, blockCount*blockSize);
00149     }
00150     return status;
00151 }
00152 
00153 
00154 int USBHostMSD::SCSIRequestSense()
00155 {
00156     USB_DBG("Request sense");
00157     uint8_t cmd[6] = {0x03,0,0,0,18,0};
00158     uint8_t result[18];
00159     int status = SCSITransfer(cmd, 6, DEVICE_TO_HOST, result, 18);
00160     return status;
00161 }
00162 
00163 
00164 int USBHostMSD::inquiry(uint8_t lun, uint8_t page_code)
00165 {
00166     USB_DBG("Inquiry");
00167     uint8_t evpd = (page_code == 0) ? 0 : 1;
00168     uint8_t cmd[6] = {0x12, uint8_t((lun << 5) | evpd), page_code, 0, 36, 0};
00169     uint8_t result[36];
00170     int status = SCSITransfer(cmd, 6, DEVICE_TO_HOST, result, 36);
00171     if (status == 0) {
00172         char vid_pid[17];
00173         memcpy(vid_pid, &result[8], 8);
00174         vid_pid[8] = 0;
00175         USB_INFO("MSD [dev: %p] - Vendor ID: %s", dev, vid_pid);
00176 
00177         memcpy(vid_pid, &result[16], 16);
00178         vid_pid[16] = 0;
00179         USB_INFO("MSD [dev: %p] - Product ID: %s", dev, vid_pid);
00180 
00181         memcpy(vid_pid, &result[32], 4);
00182         vid_pid[4] = 0;
00183         USB_INFO("MSD [dev: %p] - Product rev: %s", dev, vid_pid);
00184     }
00185     return status;
00186 }
00187 
00188 int USBHostMSD::checkResult(uint8_t res, USBEndpoint * ep)
00189 {
00190     // if ep stalled: send clear feature
00191     if (res == USB_TYPE_STALL_ERROR) {
00192         res = host->controlWrite(   dev,
00193                                     USB_RECIPIENT_ENDPOINT | USB_HOST_TO_DEVICE | USB_REQUEST_TYPE_STANDARD,
00194                                     CLEAR_FEATURE,
00195                                     0, ep->getAddress(), NULL, 0);
00196         // set state to IDLE if clear feature successful
00197         if (res == USB_TYPE_OK) {
00198             ep->setState(USB_TYPE_IDLE);
00199         }
00200     }
00201 
00202     if (res != USB_TYPE_OK)
00203         return -1;
00204 
00205     return 0;
00206 }
00207 
00208 
00209 int USBHostMSD::SCSITransfer(uint8_t * cmd, uint8_t cmd_len, int flags, uint8_t * data, uint32_t transfer_len)
00210 {
00211 
00212     int res = 0;
00213 
00214     cbw.Signature = CBW_SIGNATURE;
00215     cbw.Tag = 0;
00216     cbw.DataLength = transfer_len;
00217     cbw.Flags = flags;
00218     cbw.LUN = 0;
00219     cbw.CBLength = cmd_len;
00220     memset(cbw.CB,0,sizeof(cbw.CB));
00221     if (cmd) {
00222         memcpy(cbw.CB,cmd,cmd_len);
00223     }
00224 
00225     // send the cbw
00226     USB_DBG("Send CBW");
00227     res = host->bulkWrite(dev, bulk_out,(uint8_t *)&cbw, 31);
00228     if (checkResult(res, bulk_out))
00229         return -1;
00230 
00231     // data stage if needed
00232     if (data) {
00233         USB_DBG("data stage");
00234         if (flags == HOST_TO_DEVICE) {
00235 
00236             res = host->bulkWrite(dev, bulk_out, data, transfer_len);
00237             if (checkResult(res, bulk_out))
00238                 return -1;
00239 
00240         } else if (flags == DEVICE_TO_HOST) {
00241 
00242             res = host->bulkRead(dev, bulk_in, data, transfer_len);
00243             if (checkResult(res, bulk_in))
00244                 return -1;
00245         }
00246     }
00247 
00248     // status stage
00249     csw.Signature = 0;
00250     USB_DBG("Read CSW");
00251     res = host->bulkRead(dev, bulk_in,(uint8_t *)&csw, 13);
00252     if (checkResult(res, bulk_in))
00253         return -1;
00254 
00255     if (csw.Signature != CSW_SIGNATURE) {
00256         return -1;
00257     }
00258 
00259     USB_DBG("recv csw: status: %d", csw.Status);
00260 
00261     // ModeSense?
00262     if ((csw.Status == 1) && (cmd[0] != 0x03)) {
00263         USB_DBG("request mode sense");
00264         return SCSIRequestSense();
00265     }
00266 
00267     // perform reset recovery
00268     if ((csw.Status == 2) && (cmd[0] != 0x03)) {
00269 
00270         // send Bulk-Only Mass Storage Reset request
00271         res = host->controlWrite(   dev,
00272                                     USB_RECIPIENT_INTERFACE | USB_HOST_TO_DEVICE | USB_REQUEST_TYPE_CLASS,
00273                                     BO_MASS_STORAGE_RESET,
00274                                     0, msd_intf, NULL, 0);
00275 
00276         // unstall both endpoints
00277         res = host->controlWrite(   dev,
00278                                     USB_RECIPIENT_ENDPOINT | USB_HOST_TO_DEVICE | USB_REQUEST_TYPE_STANDARD,
00279                                     CLEAR_FEATURE,
00280                                     0, bulk_in->getAddress(), NULL, 0);
00281 
00282         res = host->controlWrite(   dev,
00283                                     USB_RECIPIENT_ENDPOINT | USB_HOST_TO_DEVICE | USB_REQUEST_TYPE_STANDARD,
00284                                     CLEAR_FEATURE,
00285                                     0, bulk_out->getAddress(), NULL, 0);
00286 
00287     }
00288 
00289     return csw.Status;
00290 }
00291 
00292 
00293 int USBHostMSD::dataTransfer(uint8_t * buf, uint32_t block, uint8_t nbBlock, int direction)
00294 {
00295     uint8_t cmd[10];
00296     memset(cmd,0,10);
00297     cmd[0] = (direction == DEVICE_TO_HOST) ? 0x28 : 0x2A;
00298 
00299     cmd[2] = (block >> 24) & 0xff;
00300     cmd[3] = (block >> 16) & 0xff;
00301     cmd[4] = (block >> 8) & 0xff;
00302     cmd[5] =  block & 0xff;
00303 
00304     cmd[7] = (nbBlock >> 8) & 0xff;
00305     cmd[8] = nbBlock & 0xff;
00306 
00307     return SCSITransfer(cmd, 10, direction, buf, blockSize*nbBlock);
00308 }
00309 
00310 int USBHostMSD::getMaxLun()
00311 {
00312     uint8_t buf[1], res;
00313     res = host->controlRead(    dev, USB_RECIPIENT_INTERFACE | USB_DEVICE_TO_HOST | USB_REQUEST_TYPE_CLASS,
00314                                 0xfe, 0, msd_intf, buf, 1);
00315     USB_DBG("max lun: %d", buf[0]);
00316     return res;
00317 }
00318 
00319 int USBHostMSD::init()
00320 {
00321     USB_DBG("FILESYSTEM: init");
00322     uint16_t i, timeout = 10, ret;
00323     getMaxLun();
00324     for (i = 0; i < timeout; i++) {
00325         Thread::wait(100);
00326         if (!testUnitReady())
00327             break;
00328     }
00329 
00330     if (i == timeout) {
00331         disk_init = false;
00332         return -1;
00333     }
00334 
00335     inquiry(0, 0);
00336     disk_init = 1;
00337     return readCapacity();
00338 }
00339 
00340 int USBHostMSD::program(const void *buffer, bd_addr_t addr, bd_size_t size)
00341 {
00342     uint32_t block_number, count;
00343     uint8_t *buf = (uint8_t *)buffer;
00344     if (!disk_init) {
00345         init();
00346     }
00347     if (!disk_init) {
00348         return -1;
00349     }
00350     block_number =  addr / blockSize;
00351     count = size /blockSize;
00352 
00353     for (uint32_t b = block_number; b < block_number + count; b++) {
00354         if (dataTransfer(buf, b, 1, HOST_TO_DEVICE))
00355             return -1;
00356         buf += blockSize;
00357     }
00358     return 0;
00359 }
00360 
00361 int USBHostMSD::read(void *buffer, bd_addr_t addr, bd_size_t size)
00362 {
00363     uint32_t block_number, count;
00364     uint8_t *buf = (uint8_t *)buffer;
00365     if (!disk_init) {
00366         init();
00367     }
00368     if (!disk_init) {
00369         return -1;
00370     }
00371     block_number =  addr / blockSize;
00372     count = size / blockSize;
00373 
00374     for (uint32_t b = block_number; b < block_number + count; b++) {
00375         if (dataTransfer(buf, b, 1, DEVICE_TO_HOST))
00376             return -1;
00377         buf += blockSize;
00378     }
00379     return 0;
00380 }
00381 
00382 int USBHostMSD::erase(bd_addr_t addr, bd_size_t size)
00383 {
00384     return 0;
00385 }
00386 
00387 bd_size_t USBHostMSD::get_read_size() const
00388 {
00389     return (disk_init ? (bd_size_t)blockSize : -1);
00390 }
00391 
00392 bd_size_t USBHostMSD::get_program_size() const
00393 {
00394     return (disk_init ? (bd_size_t)blockSize : -1);
00395 }
00396 bd_size_t USBHostMSD::get_erase_size() const
00397 {
00398     return (disk_init ? (bd_size_t)blockSize : -1);
00399 }
00400 
00401 bd_size_t USBHostMSD::size() const
00402 {
00403     USB_DBG("FILESYSTEM: size ");
00404     return (disk_init ? (bd_size_t)blockSize : 0);
00405 }
00406 #endif