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
 129         /* Send the control message. */
 130         ret = libusb_control_transfer(usb->devhdl, LIBUSB_REQUEST_TYPE_VENDOR |
 131                         LIBUSB_ENDPOINT_OUT, CMD_START, 0x0000, 0x0000,
 132                         (unsigned char *)&cmd, sizeof(cmd), USB_TIMEOUT);
 133         if (ret < 0) {
 134                 sr_err("Unable to send start command: %s.",
 135                        libusb_error_name(ret));
 136                 return SR_ERR;
 137         }
 138
 139         return SR_OK;
 140 }
 141
 142 /**
 143  * Check the USB configuration to determine if this is an fx2lafw device.
 144  *
 145  * @return TRUE if the device's configuration profile matches fx2lafw
 146  *         configuration, FALSE otherwise.
 147  */
 148 SR_PRIV gboolean match_manuf_prod(libusb_device *dev, const char *manufacturer,
 149                 const char *product)
 150 {
 151         struct libusb_device_descriptor des;
 152         struct libusb_device_handle *hdl;
 153         gboolean ret;
 154         unsigned char strdesc[64];
 155
 156         hdl = NULL;
 157         ret = FALSE;
 158         while (!ret) {
 159                 /* Assume the FW has not been loaded, unless proven wrong. */
 160                 libusb_get_device_descriptor(dev, &des);
 161
 162                 if (libusb_open(dev, &hdl) != 0)
 163                         break;
 164
 165                 if (libusb_get_string_descriptor_ascii(hdl,
 166                                 des.iManufacturer, strdesc, sizeof(strdesc)) < 0)
 167                         break;
 168                 if (strcmp((const char *)strdesc, manufacturer))
 169                         break;
 170
 171                 if (libusb_get_string_descriptor_ascii(hdl,
 172                                 des.iProduct, strdesc, sizeof(strdesc)) < 0)
 173                         break;
 174                 if (strcmp((const char *)strdesc, product))
 175                         break;
 176
 177                 ret = TRUE;
 178         }
 179         if (hdl)
 180                 libusb_close(hdl);
 181
 182         return ret;
 183 }
 184
 185 SR_PRIV int fx2lafw_dev_open(struct sr_dev_inst *sdi, struct sr_dev_driver *di)
 186 {
 187         libusb_device **devlist;
 188         struct sr_usb_dev_inst *usb;
 189         struct libusb_device_descriptor des;
 190         struct dev_context *devc;
 191         struct drv_context *drvc;
 192         struct version_info vi;
 193         int ret, i, device_count;
 194         uint8_t revid;
 195         char connection_id[64];
 196
 197         drvc = di->context;
 198         devc = sdi->priv;
 199         usb = sdi->conn;
 200
 201         if (sdi->status == SR_ST_ACTIVE)
 202                 /* Device is already in use. */
 203                 return SR_ERR;
 204
 205         device_count = libusb_get_device_list(drvc->sr_ctx->libusb_ctx, &devlist);
 206         if (device_count < 0) {
 207                 sr_err("Failed to get device list: %s.",
 208                        libusb_error_name(device_count));
 209                 return SR_ERR;
 210         }
 211
 212         for (i = 0; i < device_count; i++) {
 213                 libusb_get_device_descriptor(devlist[i], &des);
 214
 215                 if (des.idVendor != devc->profile->vid
 216                     || des.idProduct != devc->profile->pid)
 217                         continue;
 218
 219                 if ((sdi->status == SR_ST_INITIALIZING) ||
 220                                 (sdi->status == SR_ST_INACTIVE)) {
 221                         /*
 222                          * Check device by its physical USB bus/port address.
 223                          */
 224                         usb_get_port_path(devlist[i], connection_id, sizeof(connection_id));
 225                         if (strcmp(sdi->connection_id, connection_id))
 226                                 /* This is not the one. */
 227                                 continue;
 228                 }
 229
 230                 if (!(ret = libusb_open(devlist[i], &usb->devhdl))) {
 231                         if (usb->address == 0xff)
 232                                 /*
 233                                  * First time we touch this device after FW
 234                                  * upload, so we don't know the address yet.
 235                                  */
 236                                 usb->address = libusb_get_device_address(devlist[i]);
 237                 } else {
 238                         sr_err("Failed to open device: %s.",
 239                                libusb_error_name(ret));
 240                         break;
 241                 }
 242
 243                 if (libusb_has_capability(LIBUSB_CAP_SUPPORTS_DETACH_KERNEL_DRIVER)) {
 244                         if (libusb_kernel_driver_active(usb->devhdl, USB_INTERFACE) == 1) {
 245                                 if ((ret = libusb_detach_kernel_driver(usb->devhdl, USB_INTERFACE)) < 0) {
 246                                         sr_err("Failed to detach kernel driver: %s.",
 247                                                 libusb_error_name(ret));
 248                                         return SR_ERR;
 249                                 }
 250                         }
 251                 }
 252
 253                 ret = command_get_fw_version(usb->devhdl, &vi);
 254                 if (ret != SR_OK) {
 255                         sr_err("Failed to get firmware version.");
 256                         break;
 257                 }
 258
 259                 ret = command_get_revid_version(sdi, &revid);
 260                 if (ret != SR_OK) {
 261                         sr_err("Failed to get REVID.");
 262                         break;
 263                 }
 264
 265                 /*
 266                  * Changes in major version mean incompatible/API changes, so
 267                  * bail out if we encounter an incompatible version.
 268                  * Different minor versions are OK, they should be compatible.
 269                  */
 270                 if (vi.major != FX2LAFW_REQUIRED_VERSION_MAJOR) {
 271                         sr_err("Expected firmware version %d.x, "
 272                                "got %d.%d.", FX2LAFW_REQUIRED_VERSION_MAJOR,
 273                                vi.major, vi.minor);
 274                         break;
 275                 }
 276
 277                 sdi->status = SR_ST_ACTIVE;
 278                 sr_info("Opened device on %d.%d (logical) / %s (physical), "
 279                         "interface %d, firmware %d.%d.",
 280                         usb->bus, usb->address, connection_id,
 281                         USB_INTERFACE, vi.major, vi.minor);
 282
 283                 sr_info("Detected REVID=%d, it's a Cypress CY7C68013%s.",
 284                         revid, (revid != 1) ? " (FX2)" : "A (FX2LP)");
 285
 286                 break;
 287         }
 288         libusb_free_device_list(devlist, 1);
 289
 290         if (sdi->status != SR_ST_ACTIVE)
 291                 return SR_ERR;
 292
 293         return SR_OK;
 294 }
 295
 296 SR_PRIV struct dev_context *fx2lafw_dev_new(void)
 297 {
 298         struct dev_context *devc;
 299
 300         devc = g_malloc0(sizeof(struct dev_context));
 301         devc->profile = NULL;
 302         devc->fw_updated = 0;
 303         devc->cur_samplerate = 0;
 304         devc->limit_samples = 0;
 305         devc->capture_ratio = 0;
 306         devc->sample_wide = FALSE;
 307         devc->stl = NULL;
 308
 309         return devc;
 310 }
 311
 312 SR_PRIV void fx2lafw_abort_acquisition(struct dev_context *devc)
 313 {
 314         int i;
 315
 316         devc->acq_aborted = TRUE;
 317
 318         for (i = devc->num_transfers - 1; i >= 0; i--) {
 319                 if (devc->transfers[i])
 320                         libusb_cancel_transfer(devc->transfers[i]);
 321         }
 322 }
 323
 324 static void finish_acquisition(struct sr_dev_inst *sdi)
 325 {
 326         struct sr_datafeed_packet packet;
 327         struct dev_context *devc;
 328
 329         devc = sdi->priv;
 330
 331         /* Terminate session. */
 332         packet.type = SR_DF_END;
 333         sr_session_send(sdi, &packet);
 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         if (devc->stl) {
 342                 soft_trigger_logic_free(devc->stl);
 343                 devc->stl = NULL;
 344         }
 345 }
 346
 347 static void free_transfer(struct libusb_transfer *transfer)
 348 {
 349         struct sr_dev_inst *sdi;
 350         struct dev_context *devc;
 351         unsigned int i;
 352
 353         sdi = transfer->user_data;
 354         devc = sdi->priv;
 355
 356         g_free(transfer->buffer);
 357         transfer->buffer = NULL;
 358         libusb_free_transfer(transfer);
 359
 360         for (i = 0; i < devc->num_transfers; i++) {
 361                 if (devc->transfers[i] == transfer) {
 362                         devc->transfers[i] = NULL;
 363                         break;
 364                 }
 365         }
 366
 367         devc->submitted_transfers--;
 368         if (devc->submitted_transfers == 0)
 369                 finish_acquisition(sdi);
 370 }
 371
 372 static void resubmit_transfer(struct libusb_transfer *transfer)
 373 {
 374         int ret;
 375
 376         if ((ret = libusb_submit_transfer(transfer)) == LIBUSB_SUCCESS)
 377                 return;
 378
 379         sr_err("%s: %s", __func__, libusb_error_name(ret));
 380         free_transfer(transfer);
 381
 382 }
 383
 384 SR_PRIV void LIBUSB_CALL fx2lafw_receive_transfer(struct libusb_transfer *transfer)
 385 {
 386         struct sr_dev_inst *sdi;
 387         struct dev_context *devc;
 388         gboolean packet_has_error = FALSE;
 389         struct sr_datafeed_packet packet;
 390         struct sr_datafeed_logic logic;
 391         unsigned int num_samples;
 392         int trigger_offset, cur_sample_count, unitsize;
 393         int pre_trigger_samples;
 394
 395         sdi = transfer->user_data;
 396         devc = sdi->priv;
 397
 398         /*
 399          * If acquisition has already ended, just free any queued up
 400          * transfer that come in.
 401          */
 402         if (devc->acq_aborted) {
 403                 free_transfer(transfer);
 404                 return;
 405         }
 406
 407         sr_dbg("receive_transfer(): status %s received %d bytes.",
 408                 libusb_error_name(transfer->status), transfer->actual_length);
 409
 410         /* Save incoming transfer before reusing the transfer struct. */
 411         unitsize = devc->sample_wide ? 2 : 1;
 412         cur_sample_count = transfer->actual_length / unitsize;
 413
 414         switch (transfer->status) {
 415         case LIBUSB_TRANSFER_NO_DEVICE:
 416                 fx2lafw_abort_acquisition(devc);
 417                 free_transfer(transfer);
 418                 return;
 419         case LIBUSB_TRANSFER_COMPLETED:
 420         case LIBUSB_TRANSFER_TIMED_OUT: /* We may have received some data though. */
 421                 break;
 422         default:
 423                 packet_has_error = TRUE;
 424                 break;
 425         }
 426
 427         if (transfer->actual_length == 0 || packet_has_error) {
 428                 devc->empty_transfer_count++;
 429                 if (devc->empty_transfer_count > MAX_EMPTY_TRANSFERS) {
 430                         /*
 431                          * The FX2 gave up. End the acquisition, the frontend
 432                          * will work out that the samplecount is short.
 433                          */
 434                         fx2lafw_abort_acquisition(devc);
 435                         free_transfer(transfer);
 436                 } else {
 437                         resubmit_transfer(transfer);
 438                 }
 439                 return;
 440         } else {
 441                 devc->empty_transfer_count = 0;
 442         }
 443
 444         if (devc->trigger_fired) {
 445                 if (!devc->limit_samples || devc->sent_samples < devc->limit_samples) {
 446                         /* Send the incoming transfer to the session bus. */
 447                         packet.type = SR_DF_LOGIC;
 448                         packet.payload = &logic;
 449                         if (devc->limit_samples && devc->sent_samples + cur_sample_count > devc->limit_samples)
 450                                 num_samples = devc->limit_samples - devc->sent_samples;
 451                         else
 452                                 num_samples = cur_sample_count;
 453                         logic.length = num_samples * unitsize;
 454                         logic.unitsize = unitsize;
 455                         logic.data = transfer->buffer;
 456                         sr_session_send(devc->cb_data, &packet);
 457                         devc->sent_samples += num_samples;
 458                 }
 459         } else {
 460                 trigger_offset = soft_trigger_logic_check(devc->stl,
 461                         transfer->buffer, transfer->actual_length, &pre_trigger_samples);
 462                 if (trigger_offset > -1) {
 463                         devc->sent_samples += pre_trigger_samples;
 464                         packet.type = SR_DF_LOGIC;
 465                         packet.payload = &logic;
 466                         num_samples = cur_sample_count - trigger_offset;
 467                         if (devc->limit_samples &&
 468                                         num_samples > devc->limit_samples - devc->sent_samples)
 469                                 num_samples = devc->limit_samples - devc->sent_samples;
 470                         logic.length = num_samples * unitsize;
 471                         logic.unitsize = unitsize;
 472                         logic.data = transfer->buffer + trigger_offset * unitsize;
 473                         sr_session_send(devc->cb_data, &packet);
 474                         devc->sent_samples += num_samples;
 475
 476                         devc->trigger_fired = TRUE;
 477                 }
 478         }
 479
 480         if (devc->limit_samples && devc->sent_samples >= devc->limit_samples) {
 481                 fx2lafw_abort_acquisition(devc);
 482                 free_transfer(transfer);
 483         } else
 484                 resubmit_transfer(transfer);
 485 }
 486
 487 static unsigned int to_bytes_per_ms(unsigned int samplerate)
 488 {
 489         return samplerate / 1000;
 490 }
 491
 492 SR_PRIV size_t fx2lafw_get_buffer_size(struct dev_context *devc)
 493 {
 494         size_t s;
 495
 496         /*
 497          * The buffer should be large enough to hold 10ms of data and
 498          * a multiple of 512.
 499          */
 500         s = 10 * to_bytes_per_ms(devc->cur_samplerate);
 501         return (s + 511) & ~511;
 502 }
 503
 504 SR_PRIV unsigned int fx2lafw_get_number_of_transfers(struct dev_context *devc)
 505 {
 506         unsigned int n;
 507
 508         /* Total buffer size should be able to hold about 500ms of data. */
 509         n = (500 * to_bytes_per_ms(devc->cur_samplerate) /
 510                 fx2lafw_get_buffer_size(devc));
 511
 512         if (n > NUM_SIMUL_TRANSFERS)
 513                 return NUM_SIMUL_TRANSFERS;
 514
 515         return n;
 516 }
 517
 518 SR_PRIV unsigned int fx2lafw_get_timeout(struct dev_context *devc)
 519 {
 520         size_t total_size;
 521         unsigned int timeout;
 522
 523         total_size = fx2lafw_get_buffer_size(devc) *
 524                         fx2lafw_get_number_of_transfers(devc);
 525         timeout = total_size / to_bytes_per_ms(devc->cur_samplerate);
 526         return timeout + timeout / 4; /* Leave a headroom of 25% percent. */
 527 }