src/hardware/ftdi-la/api.c

   1 /*
   2  * This file is part of the libsigrok project.
   3  *
   4  * Copyright (C) 2015 Sergey Alirzaev <zl29ah@gmail.com>
   5  *
   6  * This program is free software: you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation, either version 3 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #include <config.h>
  21 #include <ftdi.h>
  22 #include <libusb.h>
  23 #include <libsigrok/libsigrok.h>
  24 #include "libsigrok-internal.h"
  25 #include "protocol.h"
  26
  27 SR_PRIV struct sr_dev_driver ftdi_la_driver_info;
  28
  29 static const uint32_t scanopts[] = {
  30         SR_CONF_CONN,
  31 };
  32
  33 static const uint32_t devopts[] = {
  34         SR_CONF_LOGIC_ANALYZER,
  35         SR_CONF_CONTINUOUS | SR_CONF_SET,
  36         SR_CONF_LIMIT_SAMPLES | SR_CONF_SET,
  37         SR_CONF_SAMPLERATE | SR_CONF_GET | SR_CONF_SET | SR_CONF_LIST,
  38         SR_CONF_CONN | SR_CONF_GET,
  39 };
  40
  41 static const uint64_t samplerates[] = {
  42         SR_HZ(3600),
  43         SR_MHZ(10),
  44         SR_HZ(1),
  45 };
  46
  47 static const struct ftdi_chip_desc ft2232h_desc = {
  48         .vendor = 0x0403,
  49         .product = 0x6010,
  50         .samplerate_div = 20,
  51         .channel_names = {
  52                 "ADBUS0",
  53                 "ADBUS1",
  54                 "ADBUS2",
  55                 "ADBUS3",
  56                 "ADBUS4",
  57                 "ADBUS5",
  58                 "ADBUS6",
  59                 "ADBUS7",
  60                 /* TODO: BDBUS[0..7] channels. */
  61                 NULL
  62         }
  63 };
  64
  65 static const struct ftdi_chip_desc ft232r_desc = {
  66         .vendor = 0x0403,
  67         .product = 0x6001,
  68         .samplerate_div = 30,
  69         .channel_names = {
  70                 "TXD",
  71                 "RXD",
  72                 "RTS#",
  73                 "CTS#",
  74                 "DTR#",
  75                 "DSR#",
  76                 "DCD#",
  77                 "RI#",
  78                 NULL
  79         }
  80 };
  81
  82 static const struct ftdi_chip_desc *chip_descs[] = {
  83         &ft2232h_desc,
  84         &ft232r_desc,
  85 };
  86
  87 static int init(struct sr_dev_driver *di, struct sr_context *sr_ctx)
  88 {
  89         return std_init(sr_ctx, di, LOG_PREFIX);
  90 }
  91
  92 static void scan_device(struct sr_dev_driver *di, struct libusb_device *dev, GSList **devices)
  93 {
  94         struct libusb_device_descriptor usb_desc;
  95         const struct ftdi_chip_desc *desc;
  96         struct dev_context *devc;
  97         char *vendor, *model, *serial_num;
  98         struct sr_dev_inst *sdi;
  99         struct drv_context *drvc;
 100         int rv;
 101
 102         drvc = di->context;
 103         libusb_get_device_descriptor(dev, &usb_desc);
 104
 105         desc = NULL;
 106         for (unsigned long i = 0; i < ARRAY_SIZE(chip_descs); i++) {
 107                 desc = chip_descs[i];
 108                 if (desc->vendor == usb_desc.idVendor &&
 109                         desc->product == usb_desc.idProduct)
 110                         break;
 111         }
 112
 113         if (!desc) {
 114                 sr_spew("Unsupported FTDI device 0x%4x:0x%4x.",
 115                         usb_desc.idVendor, usb_desc.idProduct);
 116                 return;
 117         }
 118
 119         /* Allocate memory for our private device context. */
 120         devc = g_malloc0(sizeof(struct dev_context));
 121
 122         /* Allocate memory for the incoming data. */
 123         devc->data_buf = g_malloc0(DATA_BUF_SIZE);
 124
 125         /* Allocate memory for the FTDI context (ftdic) and initialize it. */
 126         devc->ftdic = ftdi_new();
 127         if (!devc->ftdic) {
 128                 sr_err("Failed to initialize libftdi.");
 129                 goto err_free_data_buf;
 130         }
 131
 132         devc->usbdev = dev;
 133         devc->desc = desc;
 134
 135         vendor = g_malloc(32);
 136         model = g_malloc(32);
 137         serial_num = g_malloc(32);
 138         rv = ftdi_usb_get_strings(devc->ftdic, dev, vendor, 32,
 139                              model, 32, serial_num, 32);
 140         switch (rv) {
 141         case 0:
 142                 break;
 143         case -9:
 144                 sr_dbg("The device lacks a serial number.");
 145                 g_free(serial_num);
 146                 serial_num = NULL;
 147                 break;
 148         default:
 149                 sr_err("Failed to get the FTDI strings: %d", rv);
 150                 goto err_free_strings;
 151         }
 152         sr_dbg("Found an FTDI device: %s.", model);
 153
 154         /* Register the device with libsigrok. */
 155         sdi = g_malloc0(sizeof(struct sr_dev_inst));
 156         sdi->status = SR_ST_INITIALIZING;
 157         sdi->vendor = vendor;
 158         sdi->model = model;
 159         sdi->serial_num = serial_num;
 160         sdi->driver = di;
 161         sdi->priv = devc;
 162
 163         for (char *const *chan = &(desc->channel_names[0]); *chan; chan++)
 164                 sr_channel_new(sdi, chan - &(desc->channel_names[0]),
 165                                 SR_CHANNEL_LOGIC, TRUE, *chan);
 166
 167         *devices = g_slist_append(*devices, sdi);
 168         drvc->instances = g_slist_append(drvc->instances, sdi);
 169         return;
 170
 171 err_free_strings:
 172         g_free(vendor);
 173         g_free(model);
 174         g_free(serial_num);
 175         ftdi_free(devc->ftdic);
 176 err_free_data_buf:
 177         g_free(devc->data_buf);
 178         g_free(devc);
 179 }
 180
 181 static GSList *scan_all(struct sr_dev_driver *di, GSList *options)
 182 {
 183         GSList *devices;
 184         struct ftdi_device_list *devlist = 0;
 185         struct ftdi_device_list *curdev;
 186         struct ftdi_context *ftdic;
 187         int ret;
 188
 189         (void)options;
 190
 191         devices = NULL;
 192
 193         /* Allocate memory for the FTDI context (ftdic) and initialize it. */
 194         ftdic = ftdi_new();
 195         if (!ftdic) {
 196                 sr_err("Failed to initialize libftdi.");
 197                 return NULL;
 198         }
 199
 200         ret = ftdi_usb_find_all(ftdic, &devlist, 0, 0);
 201         if (ret < 0) {
 202                 sr_err("Failed to list devices (%d): %s", ret,
 203                        ftdi_get_error_string(ftdic));
 204                 goto err_free_ftdic;
 205         }
 206
 207         sr_dbg("Number of FTDI devices found: %d", ret);
 208
 209         curdev = devlist;
 210         while (curdev) {
 211                 scan_device(di, curdev->dev, &devices);
 212                 curdev = curdev->next;
 213         }
 214
 215         ftdi_list_free(&devlist);
 216         ftdi_free(ftdic);
 217
 218         return devices;
 219
 220 err_free_ftdic:
 221         ftdi_free(ftdic); /* NOT free() or g_free()! */
 222
 223         return NULL;
 224 }
 225
 226 static GSList *scan(struct sr_dev_driver *di, GSList *options)
 227 {
 228         struct sr_config *src;
 229         struct sr_usb_dev_inst *usb;
 230         const char *conn;
 231         GSList *l, *conn_devices;
 232         GSList *devices;
 233         struct drv_context *drvc;
 234         libusb_device **devlist;
 235         int i;
 236
 237         drvc = di->context;
 238         drvc->instances = NULL;
 239         conn = NULL;
 240         for (l = options; l; l = l->next) {
 241                 src = l->data;
 242                 if (src->key == SR_CONF_CONN) {
 243                         conn = g_variant_get_string(src->data, NULL);
 244                         break;
 245                 }
 246         }
 247         if (conn) {
 248                 devices = NULL;
 249                 libusb_get_device_list(drvc->sr_ctx->libusb_ctx, &devlist);
 250                 for (i = 0; devlist[i]; i++) {
 251                         conn_devices = sr_usb_find(drvc->sr_ctx->libusb_ctx, conn);
 252                         for (l = conn_devices; l; l = l->next) {
 253                                 usb = l->data;
 254                                 if (usb->bus == libusb_get_bus_number(devlist[i])
 255                                         && usb->address == libusb_get_device_address(devlist[i])) {
 256                                         scan_device(di, devlist[i], &devices);
 257                                 }
 258                         }
 259                 }
 260                 libusb_free_device_list(devlist, 1);
 261                 return devices;
 262         } else
 263                 return scan_all(di, options);
 264 }
 265
 266 static void clear_helper(void *priv)
 267 {
 268         struct dev_context *devc;
 269
 270         devc = priv;
 271
 272         ftdi_free(devc->ftdic);
 273         g_free(devc->data_buf);
 274         g_free(devc);
 275 }
 276
 277 static int dev_clear(const struct sr_dev_driver *di)
 278 {
 279         return std_dev_clear(di, clear_helper);
 280 }
 281
 282 static int dev_open(struct sr_dev_inst *sdi)
 283 {
 284         struct dev_context *devc;
 285         int ret = SR_OK;
 286
 287         devc = sdi->priv;
 288
 289         ret = ftdi_usb_open_dev(devc->ftdic, devc->usbdev);
 290         if (ret < 0) {
 291                 /* Log errors, except for -3 ("device not found"). */
 292                 if (ret != -3)
 293                         sr_err("Failed to open device (%d): %s", ret,
 294                                ftdi_get_error_string(devc->ftdic));
 295                 return SR_ERR;
 296         }
 297
 298         /* Purge RX/TX buffers in the FTDI chip. */
 299         ret = ftdi_usb_purge_buffers(devc->ftdic);
 300         if (ret < 0) {
 301                 sr_err("Failed to purge FTDI RX/TX buffers (%d): %s.",
 302                        ret, ftdi_get_error_string(devc->ftdic));
 303                 goto err_dev_open_close_ftdic;
 304         }
 305         sr_dbg("FTDI chip buffers purged successfully.");
 306
 307         /* Reset the FTDI bitmode. */
 308         ret = ftdi_set_bitmode(devc->ftdic, 0x00, BITMODE_RESET);
 309         if (ret < 0) {
 310                 sr_err("Failed to reset the FTDI chip bitmode (%d): %s.",
 311                        ret, ftdi_get_error_string(devc->ftdic));
 312                 goto err_dev_open_close_ftdic;
 313         }
 314         sr_dbg("FTDI chip bitmode reset successfully.");
 315
 316         ret = ftdi_set_bitmode(devc->ftdic, 0x00, BITMODE_BITBANG);
 317         if (ret < 0) {
 318                 sr_err("Failed to put FTDI chip into bitbang mode (%d): %s.",
 319                        ret, ftdi_get_error_string(devc->ftdic));
 320                 goto err_dev_open_close_ftdic;
 321         }
 322         sr_dbg("FTDI chip bitbang mode entered successfully.");
 323
 324         sdi->status = SR_ST_ACTIVE;
 325
 326         return SR_OK;
 327
 328 err_dev_open_close_ftdic:
 329         ftdi_usb_close(devc->ftdic);
 330         return SR_ERR;
 331 }
 332
 333 static int dev_close(struct sr_dev_inst *sdi)
 334 {
 335         struct dev_context *devc;
 336
 337         devc = sdi->priv;
 338
 339         ftdi_usb_close(devc->ftdic);
 340
 341         sdi->status = SR_ST_INACTIVE;
 342
 343         return SR_OK;
 344 }
 345
 346 static int config_get(uint32_t key, GVariant **data,
 347         const struct sr_dev_inst *sdi, const struct sr_channel_group *cg)
 348 {
 349         int ret;
 350         struct dev_context *devc;
 351         struct sr_usb_dev_inst *usb;
 352         char str[128];
 353
 354         (void)cg;
 355
 356         devc = sdi->priv;
 357
 358         ret = SR_OK;
 359         switch (key) {
 360         case SR_CONF_SAMPLERATE:
 361                 *data = g_variant_new_uint64(devc->cur_samplerate);
 362                 break;
 363         case SR_CONF_CONN:
 364                 if (!sdi || !sdi->conn)
 365                         return SR_ERR_ARG;
 366                 usb = sdi->conn;
 367                 snprintf(str, 128, "%d.%d", usb->bus, usb->address);
 368                 *data = g_variant_new_string(str);
 369                 break;
 370         default:
 371                 return SR_ERR_NA;
 372         }
 373
 374         return ret;
 375 }
 376
 377 static int config_set(uint32_t key, GVariant *data,
 378         const struct sr_dev_inst *sdi, const struct sr_channel_group *cg)
 379 {
 380         int ret;
 381         struct dev_context *devc;
 382         uint64_t value;
 383
 384         (void)cg;
 385
 386         if (sdi->status != SR_ST_ACTIVE)
 387                 return SR_ERR_DEV_CLOSED;
 388
 389         devc = sdi->priv;
 390
 391         ret = SR_OK;
 392         switch (key) {
 393         case SR_CONF_LIMIT_MSEC:
 394                 value = g_variant_get_uint64(data);
 395                 /* TODO: Implement. */
 396                 ret = SR_ERR_NA;
 397                 break;
 398         case SR_CONF_LIMIT_SAMPLES:
 399                 if (g_variant_get_uint64(data) == 0)
 400                         return SR_ERR_ARG;
 401                 devc->limit_samples = g_variant_get_uint64(data);
 402                 break;
 403         case SR_CONF_SAMPLERATE:
 404                 value = g_variant_get_uint64(data);
 405                 if (value < 3600)
 406                         return SR_ERR_SAMPLERATE;
 407                 devc->cur_samplerate = value;
 408                 return ftdi_la_set_samplerate(devc);
 409         default:
 410                 ret = SR_ERR_NA;
 411         }
 412
 413         return ret;
 414 }
 415
 416 static int config_list(uint32_t key, GVariant **data,
 417         const struct sr_dev_inst *sdi, const struct sr_channel_group *cg)
 418 {
 419         int ret;
 420         GVariant *gvar;
 421         GVariantBuilder gvb;
 422
 423         (void)sdi;
 424         (void)cg;
 425
 426         ret = SR_OK;
 427         switch (key) {
 428         case SR_CONF_SCAN_OPTIONS:
 429                 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
 430                         scanopts, ARRAY_SIZE(scanopts), sizeof(uint32_t));
 431                 break;
 432         case SR_CONF_DEVICE_OPTIONS:
 433                 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
 434                         devopts, ARRAY_SIZE(devopts), sizeof(uint32_t));
 435                 break;
 436         case SR_CONF_SAMPLERATE:
 437                 g_variant_builder_init(&gvb, G_VARIANT_TYPE("a{sv}"));
 438                 gvar = g_variant_new_fixed_array(G_VARIANT_TYPE("t"),
 439                         samplerates, ARRAY_SIZE(samplerates), sizeof(uint64_t));
 440                 g_variant_builder_add(&gvb, "{sv}", "samplerate-steps", gvar);
 441                 *data = g_variant_builder_end(&gvb);
 442                 break;
 443         default:
 444                 return SR_ERR_NA;
 445         }
 446
 447         return ret;
 448 }
 449
 450 static int dev_acquisition_start(const struct sr_dev_inst *sdi)
 451 {
 452         struct dev_context *devc;
 453
 454         devc = sdi->priv;
 455
 456         if (sdi->status != SR_ST_ACTIVE)
 457                 return SR_ERR_DEV_CLOSED;
 458
 459         if (!devc->ftdic)
 460                 return SR_ERR_BUG;
 461
 462         ftdi_set_bitmode(devc->ftdic, 0, BITMODE_BITBANG);
 463
 464         /* Properly reset internal variables before every new acquisition. */
 465         devc->samples_sent = 0;
 466         devc->bytes_received = 0;
 467
 468         std_session_send_df_header(sdi, LOG_PREFIX);
 469
 470         /* Hook up a dummy handler to receive data from the device. */
 471         sr_session_source_add(sdi->session, -1, G_IO_IN, 0,
 472                               ftdi_la_receive_data, (void *)sdi);
 473
 474         return SR_OK;
 475 }
 476
 477 static int dev_acquisition_stop(struct sr_dev_inst *sdi)
 478 {
 479         if (sdi->status != SR_ST_ACTIVE)
 480                 return SR_ERR_DEV_CLOSED;
 481
 482         sr_dbg("Stopping acquisition.");
 483         sr_session_source_remove(sdi->session, -1);
 484
 485         std_session_send_df_end(sdi, LOG_PREFIX);
 486
 487         return SR_OK;
 488 }
 489
 490 SR_PRIV struct sr_dev_driver ftdi_la_driver_info = {
 491         .name = "ftdi-la",
 492         .longname = "FTDI LA",
 493         .api_version = 1,
 494         .init = init,
 495         .cleanup = std_cleanup,
 496         .scan = scan,
 497         .dev_list = std_dev_list,
 498         .dev_clear = dev_clear,
 499         .config_get = config_get,
 500         .config_set = config_set,
 501         .config_list = config_list,
 502         .dev_open = dev_open,
 503         .dev_close = dev_close,
 504         .dev_acquisition_start = dev_acquisition_start,
 505         .dev_acquisition_stop = dev_acquisition_stop,
 506         .context = NULL,
 507 };