src/hardware/fx2lafw/protocol.c

   1 /*
   2  * This file is part of the libsigrok project.
   3  *
   4  * Copyright (C) 2013 Bert Vermeulen <bert@biot.com>
   5  * Copyright (C) 2012 Joel Holdsworth <joel@airwebreathe.org.uk>
   6  *
   7  * This program is free software: you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation, either version 3 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  19  */
  20
  21 #include <config.h>
  22 #include <glib.h>
  23 #include <glib/gstdio.h>
  24 #include "protocol.h"
  25 #include "dslogic.h"
  26
  27 #pragma pack(push, 1)
  28
  29 struct version_info {
  30         uint8_t major;
  31         uint8_t minor;
  32 };
  33
  34 struct cmd_start_acquisition {
  35         uint8_t flags;
  36         uint8_t sample_delay_h;
  37         uint8_t sample_delay_l;
  38 };
  39
  40 #pragma pack(pop)
  41
  42 #define USB_TIMEOUT 100
  43
  44 static int command_get_fw_version(libusb_device_handle *devhdl,
  45                                   struct version_info *vi)
  46 {
  47         int ret;
  48
  49         ret = libusb_control_transfer(devhdl, LIBUSB_REQUEST_TYPE_VENDOR |
  50                 LIBUSB_ENDPOINT_IN, CMD_GET_FW_VERSION, 0x0000, 0x0000,
  51                 (unsigned char *)vi, sizeof(struct version_info), USB_TIMEOUT);
  52
  53         if (ret < 0) {
  54                 sr_err("Unable to get version info: %s.",
  55                        libusb_error_name(ret));
  56                 return SR_ERR;
  57         }
  58
  59         return SR_OK;
  60 }
  61
  62 static int command_get_revid_version(struct sr_dev_inst *sdi, uint8_t *revid)
  63 {
  64         struct dev_context *devc = sdi->priv;
  65         struct sr_usb_dev_inst *usb = sdi->conn;
  66         libusb_device_handle *devhdl = usb->devhdl;
  67         int cmd, ret;
  68
  69         cmd = devc->dslogic ? DS_CMD_GET_REVID_VERSION : CMD_GET_REVID_VERSION;
  70         ret = libusb_control_transfer(devhdl, LIBUSB_REQUEST_TYPE_VENDOR |
  71                 LIBUSB_ENDPOINT_IN, cmd, 0x0000, 0x0000, revid, 1, USB_TIMEOUT);
  72
  73         if (ret < 0) {
  74                 sr_err("Unable to get REVID: %s.", libusb_error_name(ret));
  75                 return SR_ERR;
  76         }
  77
  78         return SR_OK;
  79 }
  80
  81 SR_PRIV int fx2lafw_command_start_acquisition(const struct sr_dev_inst *sdi)
  82 {
  83         struct dev_context *devc;
  84         struct sr_usb_dev_inst *usb;
  85         uint64_t samplerate;
  86         struct cmd_start_acquisition cmd;
  87         int delay, ret;
  88
  89         devc = sdi->priv;
  90         usb = sdi->conn;
  91         samplerate = devc->cur_samplerate;
  92
  93         /* Compute the sample rate. */
  94         if (devc->sample_wide && samplerate > MAX_16BIT_SAMPLE_RATE) {
  95                 sr_err("Unable to sample at %" PRIu64 "Hz "
  96                        "when collecting 16-bit samples.", samplerate);
  97                 return SR_ERR;
  98         }
  99
 100         delay = 0;
 101         cmd.flags = cmd.sample_delay_h = cmd.sample_delay_l = 0;
 102         if ((SR_MHZ(48) % samplerate) == 0) {
 103                 cmd.flags = CMD_START_FLAGS_CLK_48MHZ;
 104                 delay = SR_MHZ(48) / samplerate - 1;
 105                 if (delay > MAX_SAMPLE_DELAY)
 106                         delay = 0;
 107         }
 108
 109         if (delay == 0 && (SR_MHZ(30) % samplerate) == 0) {
 110                 cmd.flags = CMD_START_FLAGS_CLK_30MHZ;
 111                 delay = SR_MHZ(30) / samplerate - 1;
 112         }
 113
 114         sr_dbg("GPIF delay = %d, clocksource = %sMHz.", delay,
 115                 (cmd.flags & CMD_START_FLAGS_CLK_48MHZ) ? "48" : "30");
 116
 117         if (delay <= 0 || delay > MAX_SAMPLE_DELAY) {
 118                 sr_err("Unable to sample at %" PRIu64 "Hz.", samplerate);
 119                 return SR_ERR;
 120         }
 121
 122         cmd.sample_delay_h = (delay >> 8) & 0xff;
 123         cmd.sample_delay_l = delay & 0xff;
 124
 125         /* Select the sampling width. */
 126         cmd.flags |= devc->sample_wide ? CMD_START_FLAGS_SAMPLE_16BIT :
 127                 CMD_START_FLAGS_SAMPLE_8BIT;
 128         /* Enable CTL2 clock. */
 129         cmd.flags |= (devc->profile->dev_caps & DEV_CAPS_AX_ANALOG) ? CMD_START_FLAGS_CLK_CTL2 : 0;
 130
 131         /* Send the control message. */
 132         ret = libusb_control_transfer(usb->devhdl, LIBUSB_REQUEST_TYPE_VENDOR |
 133                         LIBUSB_ENDPOINT_OUT, CMD_START, 0x0000, 0x0000,
 134                         (unsigned char *)&cmd, sizeof(cmd), USB_TIMEOUT);
 135         if (ret < 0) {
 136                 sr_err("Unable to send start command: %s.",
 137                        libusb_error_name(ret));
 138                 return SR_ERR;
 139         }
 140
 141         return SR_OK;
 142 }
 143
 144 /**
 145  * Check the USB configuration to determine if this is an fx2lafw device.
 146  *
 147  * @return TRUE if the device's configuration profile matches fx2lafw
 148  *         configuration, FALSE otherwise.
 149  */
 150 SR_PRIV gboolean match_manuf_prod(libusb_device *dev, const char *manufacturer,
 151                 const char *product)
 152 {
 153         struct libusb_device_descriptor des;
 154         struct libusb_device_handle *hdl;
 155         gboolean ret;
 156         unsigned char strdesc[64];
 157
 158         hdl = NULL;
 159         ret = FALSE;
 160         while (!ret) {
 161                 /* Assume the FW has not been loaded, unless proven wrong. */
 162                 libusb_get_device_descriptor(dev, &des);
 163
 164                 if (libusb_open(dev, &hdl) != 0)
 165                         break;
 166
 167                 if (libusb_get_string_descriptor_ascii(hdl,
 168                                 des.iManufacturer, strdesc, sizeof(strdesc)) < 0)
 169                         break;
 170                 if (strcmp((const char *)strdesc, manufacturer))
 171                         break;
 172
 173                 if (libusb_get_string_descriptor_ascii(hdl,
 174                                 des.iProduct, strdesc, sizeof(strdesc)) < 0)
 175                         break;
 176                 if (strcmp((const char *)strdesc, product))
 177                         break;
 178
 179                 ret = TRUE;
 180         }
 181         if (hdl)
 182                 libusb_close(hdl);
 183
 184         return ret;
 185 }
 186
 187 SR_PRIV int fx2lafw_dev_open(struct sr_dev_inst *sdi, struct sr_dev_driver *di)
 188 {
 189         libusb_device **devlist;
 190         struct sr_usb_dev_inst *usb;
 191         struct libusb_device_descriptor des;
 192         struct dev_context *devc;
 193         struct drv_context *drvc;
 194         struct version_info vi;
 195         int ret, i, device_count;
 196         uint8_t revid;
 197         char connection_id[64];
 198
 199         drvc = di->context;
 200         devc = sdi->priv;
 201         usb = sdi->conn;
 202
 203         if (sdi->status == SR_ST_ACTIVE)
 204                 /* Device is already in use. */
 205                 return SR_ERR;
 206
 207         device_count = libusb_get_device_list(drvc->sr_ctx->libusb_ctx, &devlist);
 208         if (device_count < 0) {
 209                 sr_err("Failed to get device list: %s.",
 210                        libusb_error_name(device_count));
 211                 return SR_ERR;
 212         }
 213
 214         for (i = 0; i < device_count; i++) {
 215                 libusb_get_device_descriptor(devlist[i], &des);
 216
 217                 if (des.idVendor != devc->profile->vid
 218                     || des.idProduct != devc->profile->pid)
 219                         continue;
 220
 221                 if ((sdi->status == SR_ST_INITIALIZING) ||
 222                                 (sdi->status == SR_ST_INACTIVE)) {
 223                         /*
 224                          * Check device by its physical USB bus/port address.
 225                          */
 226                         usb_get_port_path(devlist[i], connection_id, sizeof(connection_id));
 227                         if (strcmp(sdi->connection_id, connection_id))
 228                                 /* This is not the one. */
 229                                 continue;
 230                 }
 231
 232                 if (!(ret = libusb_open(devlist[i], &usb->devhdl))) {
 233                         if (usb->address == 0xff)
 234                                 /*
 235                                  * First time we touch this device after FW
 236                                  * upload, so we don't know the address yet.
 237                                  */
 238                                 usb->address = libusb_get_device_address(devlist[i]);
 239                 } else {
 240                         sr_err("Failed to open device: %s.",
 241                                libusb_error_name(ret));
 242                         break;
 243                 }
 244
 245                 if (libusb_has_capability(LIBUSB_CAP_SUPPORTS_DETACH_KERNEL_DRIVER)) {
 246                         if (libusb_kernel_driver_active(usb->devhdl, USB_INTERFACE) == 1) {
 247                                 if ((ret = libusb_detach_kernel_driver(usb->devhdl, USB_INTERFACE)) < 0) {
 248                                         sr_err("Failed to detach kernel driver: %s.",
 249                                                 libusb_error_name(ret));
 250                                         return SR_ERR;
 251                                 }
 252                         }
 253                 }
 254
 255                 ret = command_get_fw_version(usb->devhdl, &vi);
 256                 if (ret != SR_OK) {
 257                         sr_err("Failed to get firmware version.");
 258                         break;
 259                 }
 260
 261                 ret = command_get_revid_version(sdi, &revid);
 262                 if (ret != SR_OK) {
 263                         sr_err("Failed to get REVID.");
 264                         break;
 265                 }
 266
 267                 /*
 268                  * Changes in major version mean incompatible/API changes, so
 269                  * bail out if we encounter an incompatible version.
 270                  * Different minor versions are OK, they should be compatible.
 271                  */
 272                 if (vi.major != FX2LAFW_REQUIRED_VERSION_MAJOR) {
 273                         sr_err("Expected firmware version %d.x, "
 274                                "got %d.%d.", FX2LAFW_REQUIRED_VERSION_MAJOR,
 275                                vi.major, vi.minor);
 276                         break;
 277                 }
 278
 279                 sdi->status = SR_ST_ACTIVE;
 280                 sr_info("Opened device on %d.%d (logical) / %s (physical), "
 281                         "interface %d, firmware %d.%d.",
 282                         usb->bus, usb->address, connection_id,
 283                         USB_INTERFACE, vi.major, vi.minor);
 284
 285                 sr_info("Detected REVID=%d, it's a Cypress CY7C68013%s.",
 286                         revid, (revid != 1) ? " (FX2)" : "A (FX2LP)");
 287
 288                 break;
 289         }
 290         libusb_free_device_list(devlist, 1);
 291
 292         if (sdi->status != SR_ST_ACTIVE)
 293                 return SR_ERR;
 294
 295         return SR_OK;
 296 }
 297
 298 SR_PRIV struct dev_context *fx2lafw_dev_new(void)
 299 {
 300         struct dev_context *devc;
 301
 302         devc = g_malloc0(sizeof(struct dev_context));
 303         devc->profile = NULL;
 304         devc->fw_updated = 0;
 305         devc->cur_samplerate = 0;
 306         devc->limit_samples = 0;
 307         devc->capture_ratio = 0;
 308         devc->sample_wide = FALSE;
 309         devc->trigger_en = FALSE;
 310         devc->stl = NULL;
 311
 312         return devc;
 313 }
 314
 315 SR_PRIV void fx2lafw_abort_acquisition(struct dev_context *devc)
 316 {
 317         int i;
 318
 319         devc->acq_aborted = TRUE;
 320
 321         for (i = devc->num_transfers - 1; i >= 0; i--) {
 322                 if (devc->transfers[i])
 323                         libusb_cancel_transfer(devc->transfers[i]);
 324         }
 325 }
 326
 327 static void finish_acquisition(struct sr_dev_inst *sdi)
 328 {
 329         struct dev_context *devc;
 330
 331         devc = sdi->priv;
 332
 333         std_session_send_df_end(sdi, LOG_PREFIX);
 334
 335         /* Remove fds from polling. */
 336         usb_source_remove(sdi->session, devc->ctx);
 337
 338         devc->num_transfers = 0;
 339         g_free(devc->transfers);
 340
 341         /* Free the deinterlace buffers if we had them */
 342         g_free(devc->logic_buffer);
 343         g_free(devc->analog_buffer);
 344
 345         if (devc->stl) {
 346                 soft_trigger_logic_free(devc->stl);
 347                 devc->stl = NULL;
 348         }
 349 }
 350
 351 static void free_transfer(struct libusb_transfer *transfer)
 352 {
 353         struct sr_dev_inst *sdi;
 354         struct dev_context *devc;
 355         unsigned int i;
 356
 357         sdi = transfer->user_data;
 358         devc = sdi->priv;
 359
 360         g_free(transfer->buffer);
 361         transfer->buffer = NULL;
 362         libusb_free_transfer(transfer);
 363
 364         for (i = 0; i < devc->num_transfers; i++) {
 365                 if (devc->transfers[i] == transfer) {
 366                         devc->transfers[i] = NULL;
 367                         break;
 368                 }
 369         }
 370
 371         devc->submitted_transfers--;
 372         if (devc->submitted_transfers == 0)
 373                 finish_acquisition(sdi);
 374 }
 375
 376 static void resubmit_transfer(struct libusb_transfer *transfer)
 377 {
 378         int ret;
 379
 380         if ((ret = libusb_submit_transfer(transfer)) == LIBUSB_SUCCESS)
 381                 return;
 382
 383         sr_err("%s: %s", __func__, libusb_error_name(ret));
 384         free_transfer(transfer);
 385
 386 }
 387
 388 SR_PRIV void mso_send_data_proc(struct sr_dev_inst *sdi,
 389         uint8_t *data, size_t length, size_t sample_width)
 390 {
 391         size_t i;
 392         struct dev_context *devc;
 393
 394         devc = sdi->priv;
 395
 396         sample_width = sample_width;
 397         length /= 2;
 398
 399         /* Send the logic */
 400         for (i = 0; i < length; i++) {
 401                 devc->logic_buffer[i]  = data[i * 2];
 402                 /* Rescale to -10V - +10V from 0-255. */
 403                 devc->analog_buffer[i] = data[i * 2 + 1] - 128.0f / 12.8f;
 404         };
 405
 406         const struct sr_datafeed_logic logic = {
 407                 .length = length,
 408                 .unitsize = 1,
 409                 .data = devc->logic_buffer
 410         };
 411
 412         const struct sr_datafeed_packet logic_packet = {
 413                 .type = SR_DF_LOGIC,
 414                 .payload = &logic
 415         };
 416
 417         sr_session_send(sdi, &logic_packet);
 418
 419         const struct sr_datafeed_analog_old analog = {
 420                 .channels = devc->enabled_analog_channels,
 421                 .num_samples = length,
 422                 .mq = SR_MQ_VOLTAGE,
 423                 .unit = SR_UNIT_VOLT,
 424                 .mqflags = 0 /*SR_MQFLAG_DC*/,
 425                 .data = devc->analog_buffer
 426         };
 427
 428         const struct sr_datafeed_packet analog_packet = {
 429                 .type = SR_DF_ANALOG_OLD,
 430                 .payload = &analog
 431         };
 432
 433         sr_session_send(sdi, &analog_packet);
 434 }
 435
 436 SR_PRIV void la_send_data_proc(struct sr_dev_inst *sdi,
 437         uint8_t *data, size_t length, size_t sample_width)
 438 {
 439         const struct sr_datafeed_logic logic = {
 440                 .length = length,
 441                 .unitsize = sample_width,
 442                 .data = data
 443         };
 444
 445         const struct sr_datafeed_packet packet = {
 446                 .type = SR_DF_LOGIC,
 447                 .payload = &logic
 448         };
 449
 450         sr_session_send(sdi, &packet);
 451 }
 452
 453 SR_PRIV void LIBUSB_CALL fx2lafw_receive_transfer(struct libusb_transfer *transfer)
 454 {
 455         struct sr_dev_inst *sdi;
 456         struct dev_context *devc;
 457         gboolean packet_has_error = FALSE;
 458         unsigned int num_samples;
 459         int trigger_offset, cur_sample_count, unitsize;
 460         int pre_trigger_samples;
 461
 462         sdi = transfer->user_data;
 463         devc = sdi->priv;
 464
 465         /*
 466          * If acquisition has already ended, just free any queued up
 467          * transfer that come in.
 468          */
 469         if (devc->acq_aborted) {
 470                 free_transfer(transfer);
 471                 return;
 472         }
 473
 474         sr_dbg("receive_transfer(): status %s received %d bytes.",
 475                 libusb_error_name(transfer->status), transfer->actual_length);
 476
 477         /* Save incoming transfer before reusing the transfer struct. */
 478         unitsize = devc->sample_wide ? 2 : 1;
 479         cur_sample_count = transfer->actual_length / unitsize;
 480
 481         switch (transfer->status) {
 482         case LIBUSB_TRANSFER_NO_DEVICE:
 483                 fx2lafw_abort_acquisition(devc);
 484                 free_transfer(transfer);
 485                 return;
 486         case LIBUSB_TRANSFER_COMPLETED:
 487         case LIBUSB_TRANSFER_TIMED_OUT: /* We may have received some data though. */
 488                 break;
 489         default:
 490                 packet_has_error = TRUE;
 491                 break;
 492         }
 493
 494         if (transfer->actual_length == 0 || packet_has_error) {
 495                 devc->empty_transfer_count++;
 496                 if (devc->empty_transfer_count > MAX_EMPTY_TRANSFERS) {
 497                         /*
 498                          * The FX2 gave up. End the acquisition, the frontend
 499                          * will work out that the samplecount is short.
 500                          */
 501                         fx2lafw_abort_acquisition(devc);
 502                         free_transfer(transfer);
 503                 } else {
 504                         resubmit_transfer(transfer);
 505                 }
 506                 return;
 507         } else {
 508                 devc->empty_transfer_count = 0;
 509         }
 510         if (devc->trigger_en)
 511                 devc->trigger_fired = TRUE;
 512         if (devc->trigger_fired) {
 513                 if (!devc->limit_samples || devc->sent_samples < devc->limit_samples) {
 514                         /* Send the incoming transfer to the session bus. */
 515                         if (devc->limit_samples && devc->sent_samples + cur_sample_count > devc->limit_samples)
 516                                 num_samples = devc->limit_samples - devc->sent_samples;
 517                         else
 518                                 num_samples = cur_sample_count;
 519
 520                         devc->send_data_proc(sdi, (uint8_t *)transfer->buffer,
 521                                 num_samples * unitsize, unitsize);
 522                         devc->sent_samples += num_samples;
 523                 }
 524         } else {
 525                 trigger_offset = soft_trigger_logic_check(devc->stl,
 526                         transfer->buffer, transfer->actual_length, &pre_trigger_samples);
 527                 if (trigger_offset > -1) {
 528                         devc->sent_samples += pre_trigger_samples;
 529                         num_samples = cur_sample_count - trigger_offset;
 530                         if (devc->limit_samples &&
 531                                         num_samples > devc->limit_samples - devc->sent_samples)
 532                                 num_samples = devc->limit_samples - devc->sent_samples;
 533
 534                         devc->send_data_proc(sdi, (uint8_t *)transfer->buffer
 535                                         + trigger_offset * unitsize,
 536                                         num_samples * unitsize, unitsize);
 537                         devc->sent_samples += num_samples;
 538
 539                         devc->trigger_fired = TRUE;
 540                 }
 541         }
 542
 543         if (devc->limit_samples && devc->sent_samples >= devc->limit_samples) {
 544                 fx2lafw_abort_acquisition(devc);
 545                 free_transfer(transfer);
 546         } else
 547                 resubmit_transfer(transfer);
 548 }
 549
 550 static unsigned int to_bytes_per_ms(unsigned int samplerate)
 551 {
 552         return samplerate / 1000;
 553 }
 554
 555 SR_PRIV size_t fx2lafw_get_buffer_size(struct dev_context *devc)
 556 {
 557         size_t s;
 558
 559         /*
 560          * The buffer should be large enough to hold 10ms of data and
 561          * a multiple of 512.
 562          */
 563         s = 10 * to_bytes_per_ms(devc->cur_samplerate);
 564         return (s + 511) & ~511;
 565 }
 566
 567 SR_PRIV unsigned int fx2lafw_get_number_of_transfers(struct dev_context *devc)
 568 {
 569         unsigned int n;
 570
 571         /* Total buffer size should be able to hold about 500ms of data. */
 572         n = (500 * to_bytes_per_ms(devc->cur_samplerate) /
 573                 fx2lafw_get_buffer_size(devc));
 574
 575         if (n > NUM_SIMUL_TRANSFERS)
 576                 return NUM_SIMUL_TRANSFERS;
 577
 578         return n;
 579 }
 580
 581 SR_PRIV unsigned int fx2lafw_get_timeout(struct dev_context *devc)
 582 {
 583         size_t total_size;
 584         unsigned int timeout;
 585
 586         total_size = fx2lafw_get_buffer_size(devc) *
 587                         fx2lafw_get_number_of_transfers(devc);
 588         timeout = total_size / to_bytes_per_ms(devc->cur_samplerate);
 589         return timeout + timeout / 4; /* Leave a headroom of 25% percent. */
 590 }