hardware/victor-dmm/api.c

   1 /*
   2  * This file is part of the libsigrok project.
   3  *
   4  * Copyright (C) 2012 Bert Vermeulen <bert@biot.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 <glib.h>
  21 #include <libusb.h>
  22 #include <stdlib.h>
  23 #include <string.h>
  24 #include "libsigrok.h"
  25 #include "libsigrok-internal.h"
  26 #include "protocol.h"
  27
  28 #define VICTOR_VID 0x1244
  29 #define VICTOR_PID 0xd237
  30 #define VICTOR_VENDOR "Victor"
  31 #define VICTOR_INTERFACE 0
  32 #define VICTOR_ENDPOINT LIBUSB_ENDPOINT_IN | 1
  33
  34 SR_PRIV struct sr_dev_driver victor_dmm_driver_info;
  35 static struct sr_dev_driver *di = &victor_dmm_driver_info;
  36 static int hw_dev_close(struct sr_dev_inst *sdi);
  37 static int hw_dev_acquisition_stop(struct sr_dev_inst *sdi, void *cb_data);
  38
  39 static const int32_t hwopts[] = {
  40         SR_CONF_CONN,
  41 };
  42
  43 static const int32_t hwcaps[] = {
  44         SR_CONF_MULTIMETER,
  45         SR_CONF_LIMIT_MSEC,
  46         SR_CONF_LIMIT_SAMPLES,
  47         SR_CONF_CONTINUOUS,
  48 };
  49
  50 /* Properly close and free all devices. */
  51 static int clear_instances(void)
  52 {
  53         struct sr_dev_inst *sdi;
  54         struct drv_context *drvc;
  55         struct dev_context *devc;
  56         GSList *l;
  57
  58         if (!(drvc = di->priv))
  59                 /* Can get called on an unused driver, doesn't matter. */
  60                 return SR_OK;
  61
  62         for (l = drvc->instances; l; l = l->next) {
  63                 if (!(sdi = l->data))
  64                         continue;
  65                 if (!(devc = sdi->priv))
  66                         continue;
  67                 hw_dev_close(sdi);
  68                 sr_usb_dev_inst_free(sdi->conn);
  69                 sr_dev_inst_free(sdi);
  70         }
  71
  72         g_slist_free(drvc->instances);
  73         drvc->instances = NULL;
  74
  75         return SR_OK;
  76 }
  77
  78 static int hw_init(struct sr_context *sr_ctx)
  79 {
  80         return std_hw_init(sr_ctx, di, DRIVER_LOG_DOMAIN);
  81 }
  82
  83 static GSList *hw_scan(GSList *options)
  84 {
  85         struct drv_context *drvc;
  86         struct dev_context *devc;
  87         struct sr_dev_inst *sdi;
  88         struct sr_probe *probe;
  89         struct libusb_device_descriptor des;
  90         libusb_device **devlist;
  91         GSList *devices;
  92         int ret, devcnt, i;
  93
  94         (void)options;
  95
  96         drvc = di->priv;
  97
  98         /* USB scan is always authoritative. */
  99         clear_instances();
 100
 101         devices = NULL;
 102         libusb_get_device_list(drvc->sr_ctx->libusb_ctx, &devlist);
 103         for (i = 0; devlist[i]; i++) {
 104                 if ((ret = libusb_get_device_descriptor(devlist[i], &des)) != 0) {
 105                         sr_warn("Failed to get device descriptor: %s",
 106                                         libusb_error_name(ret));
 107                         continue;
 108                 }
 109
 110                 if (des.idVendor != VICTOR_VID || des.idProduct != VICTOR_PID)
 111                         continue;
 112
 113                 devcnt = g_slist_length(drvc->instances);
 114                 if (!(sdi = sr_dev_inst_new(devcnt, SR_ST_INACTIVE,
 115                                 VICTOR_VENDOR, NULL, NULL)))
 116                         return NULL;
 117                 sdi->driver = di;
 118
 119                 if (!(devc = g_try_malloc0(sizeof(struct dev_context))))
 120                         return NULL;
 121                 sdi->priv = devc;
 122
 123                 if (!(probe = sr_probe_new(0, SR_PROBE_ANALOG, TRUE, "P1")))
 124                         return NULL;
 125                 sdi->probes = g_slist_append(NULL, probe);
 126
 127                 if (!(sdi->conn = sr_usb_dev_inst_new(libusb_get_bus_number(devlist[i]),
 128                                 libusb_get_device_address(devlist[i]), NULL)))
 129                         return NULL;
 130                 sdi->inst_type = SR_INST_USB;
 131
 132                 drvc->instances = g_slist_append(drvc->instances, sdi);
 133                 devices = g_slist_append(devices, sdi);
 134         }
 135         libusb_free_device_list(devlist, 1);
 136
 137         return devices;
 138 }
 139
 140 static GSList *hw_dev_list(void)
 141 {
 142         return ((struct drv_context *)(di->priv))->instances;
 143 }
 144
 145 static int hw_dev_open(struct sr_dev_inst *sdi)
 146 {
 147         struct drv_context *drvc = di->priv;
 148         struct sr_usb_dev_inst *usb;
 149         libusb_device **devlist;
 150         int ret, i;
 151
 152         if (!di->priv) {
 153                 sr_err("Driver was not initialized.");
 154                 return SR_ERR;
 155         }
 156
 157         usb = sdi->conn;
 158
 159         libusb_get_device_list(drvc->sr_ctx->libusb_ctx, &devlist);
 160         for (i = 0; devlist[i]; i++) {
 161                 if (libusb_get_bus_number(devlist[i]) != usb->bus
 162                                 || libusb_get_device_address(devlist[i]) != usb->address)
 163                         continue;
 164                 if ((ret = libusb_open(devlist[i], &usb->devhdl))) {
 165                         sr_err("Failed to open device: %s.", libusb_error_name(ret));
 166                         return SR_ERR;
 167                 }
 168                 break;
 169         }
 170         libusb_free_device_list(devlist, 1);
 171         if (!devlist[i]) {
 172                 sr_err("Device not found.");
 173                 return SR_ERR;
 174         }
 175
 176         /* The device reports as HID class, so the kernel would have
 177          * claimed it. */
 178         if (libusb_kernel_driver_active(usb->devhdl, 0) == 1) {
 179                 if ((ret = libusb_detach_kernel_driver(usb->devhdl, 0)) < 0) {
 180                         sr_err("Failed to detach kernel driver: %s.",
 181                                libusb_error_name(ret));
 182                         return SR_ERR;
 183                 }
 184         }
 185
 186         if ((ret = libusb_claim_interface(usb->devhdl,
 187                         VICTOR_INTERFACE))) {
 188                 sr_err("Failed to claim interface: %s.", libusb_error_name(ret));
 189                 return SR_ERR;
 190         }
 191         sdi->status = SR_ST_ACTIVE;
 192
 193         return SR_OK;
 194 }
 195
 196 static int hw_dev_close(struct sr_dev_inst *sdi)
 197 {
 198         struct sr_usb_dev_inst *usb;
 199
 200         if (!di->priv) {
 201                 sr_err("Driver was not initialized.");
 202                 return SR_ERR;
 203         }
 204
 205         usb = sdi->conn;
 206
 207         if (!usb->devhdl)
 208                 /*  Nothing to do. */
 209                 return SR_OK;
 210
 211         libusb_release_interface(usb->devhdl, VICTOR_INTERFACE);
 212         libusb_close(usb->devhdl);
 213         usb->devhdl = NULL;
 214         sdi->status = SR_ST_INACTIVE;
 215
 216         return SR_OK;
 217 }
 218
 219 static int hw_cleanup(void)
 220 {
 221         struct drv_context *drvc;
 222
 223         if (!(drvc = di->priv))
 224                 /* Can get called on an unused driver, doesn't matter. */
 225                 return SR_OK;
 226
 227         clear_instances();
 228         g_free(drvc);
 229         di->priv = NULL;
 230
 231         return SR_OK;
 232 }
 233
 234 static int config_get(int id, GVariant **data, const struct sr_dev_inst *sdi)
 235 {
 236         struct sr_usb_dev_inst *usb;
 237         char str[128];
 238
 239         switch (id) {
 240         case SR_CONF_CONN:
 241                 if (!sdi || !sdi->conn)
 242                         return SR_ERR_ARG;
 243                 usb = sdi->conn;
 244                 snprintf(str, 128, "%d.%d", usb->bus, usb->address);
 245                 *data = g_variant_new_string(str);
 246                 break;
 247         default:
 248                 return SR_ERR_NA;
 249         }
 250
 251         return SR_OK;
 252 }
 253
 254 static int config_set(int id, GVariant *data, const struct sr_dev_inst *sdi)
 255 {
 256         struct dev_context *devc;
 257         gint64 now;
 258         int ret;
 259
 260         if (!di->priv) {
 261                 sr_err("Driver was not initialized.");
 262                 return SR_ERR;
 263         }
 264
 265         devc = sdi->priv;
 266         ret = SR_OK;
 267         switch (id) {
 268         case SR_CONF_LIMIT_MSEC:
 269                 devc->limit_msec = g_variant_get_uint64(data);
 270                 now = g_get_monotonic_time() / 1000;
 271                 devc->end_time = now + devc->limit_msec;
 272                 sr_dbg("Setting time limit to %" PRIu64 "ms.",
 273                        devc->limit_msec);
 274                 break;
 275         case SR_CONF_LIMIT_SAMPLES:
 276                 devc->limit_samples = g_variant_get_uint64(data);
 277                 sr_dbg("Setting sample limit to %" PRIu64 ".",
 278                        devc->limit_samples);
 279                 break;
 280         default:
 281                 ret = SR_ERR_NA;
 282         }
 283
 284         return ret;
 285 }
 286
 287 static int config_list(int key, GVariant **data, const struct sr_dev_inst *sdi)
 288 {
 289
 290         (void)sdi;
 291
 292         switch (key) {
 293         case SR_CONF_SCAN_OPTIONS:
 294                 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_INT32,
 295                                 hwopts, ARRAY_SIZE(hwopts), sizeof(int32_t));
 296                 break;
 297         case SR_CONF_DEVICE_OPTIONS:
 298                 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_INT32,
 299                                 hwcaps, ARRAY_SIZE(hwcaps), sizeof(int32_t));
 300                 break;
 301         default:
 302                 return SR_ERR_NA;
 303         }
 304
 305         return SR_OK;
 306 }
 307
 308 static void receive_transfer(struct libusb_transfer *transfer)
 309 {
 310         struct dev_context *devc;
 311         struct sr_dev_inst *sdi;
 312         int ret;
 313
 314         sdi = transfer->user_data;
 315         devc = sdi->priv;
 316         if (transfer->status == LIBUSB_TRANSFER_NO_DEVICE) {
 317                 /* USB device was unplugged. */
 318                 hw_dev_acquisition_stop(sdi, sdi);
 319         } else if (transfer->status == LIBUSB_TRANSFER_COMPLETED) {
 320                 sr_dbg("Got %d-byte packet.", transfer->actual_length);
 321                 if (transfer->actual_length == DMM_DATA_SIZE) {
 322                         victor_dmm_receive_data(sdi, transfer->buffer);
 323                         if (devc->limit_samples) {
 324                                 if (devc->num_samples >= devc->limit_samples)
 325                                         hw_dev_acquisition_stop(sdi, sdi);
 326                         }
 327                 }
 328         }
 329         /* Anything else is either an error or a timeout, which is fine:
 330          * we were just going to send another transfer request anyway. */
 331
 332         if (sdi->status == SR_ST_ACTIVE) {
 333                 /* Send the same request again. */
 334                 if ((ret = libusb_submit_transfer(transfer) != 0)) {
 335                         sr_err("Unable to resubmit transfer: %s.",
 336                                libusb_error_name(ret));
 337                         g_free(transfer->buffer);
 338                         libusb_free_transfer(transfer);
 339                         hw_dev_acquisition_stop(sdi, sdi);
 340                 }
 341         } else {
 342                 /* This was the last transfer we're going to receive, so
 343                  * clean up now. */
 344                 g_free(transfer->buffer);
 345                 libusb_free_transfer(transfer);
 346         }
 347 }
 348
 349 static int handle_events(int fd, int revents, void *cb_data)
 350 {
 351         struct dev_context *devc;
 352         struct drv_context *drvc = di->priv;
 353         struct sr_datafeed_packet packet;
 354         struct sr_dev_inst *sdi;
 355         struct timeval tv;
 356         gint64 now;
 357         int i;
 358
 359         (void)fd;
 360         (void)revents;
 361
 362         sdi = cb_data;
 363         devc = sdi->priv;
 364
 365         if (devc->limit_msec) {
 366                 now = g_get_monotonic_time() / 1000;
 367                 if (now > devc->end_time)
 368                         hw_dev_acquisition_stop(sdi, sdi);
 369         }
 370
 371         if (sdi->status == SR_ST_STOPPING) {
 372                 for (i = 0; devc->usbfd[i] != -1; i++)
 373                         sr_source_remove(devc->usbfd[i]);
 374
 375                 hw_dev_close(sdi);
 376
 377                 packet.type = SR_DF_END;
 378                 sr_session_send(cb_data, &packet);
 379         }
 380
 381         memset(&tv, 0, sizeof(struct timeval));
 382         libusb_handle_events_timeout_completed(drvc->sr_ctx->libusb_ctx, &tv,
 383                                                NULL);
 384
 385         return TRUE;
 386 }
 387
 388 static int hw_dev_acquisition_start(const struct sr_dev_inst *sdi,
 389                                     void *cb_data)
 390 {
 391         struct dev_context *devc;
 392         struct drv_context *drvc = di->priv;
 393         const struct libusb_pollfd **pfd;
 394         struct sr_usb_dev_inst *usb;
 395         struct libusb_transfer *transfer;
 396         int ret, i;
 397         unsigned char *buf;
 398
 399         if (!di->priv) {
 400                 sr_err("Driver was not initialized.");
 401                 return SR_ERR;
 402         }
 403
 404         devc = sdi->priv;
 405         usb = sdi->conn;
 406         devc->cb_data = cb_data;
 407
 408         /* Send header packet to the session bus. */
 409         std_session_send_df_header(cb_data, DRIVER_LOG_DOMAIN);
 410
 411         pfd = libusb_get_pollfds(drvc->sr_ctx->libusb_ctx);
 412         for (i = 0; pfd[i]; i++) {
 413                 /* Handle USB events every 100ms, for decent latency. */
 414                 sr_source_add(pfd[i]->fd, pfd[i]->events, 100,
 415                                 handle_events, (void *)sdi);
 416                 /* We'll need to remove this fd later. */
 417                 devc->usbfd[i] = pfd[i]->fd;
 418         }
 419         devc->usbfd[i] = -1;
 420
 421         buf = g_try_malloc(DMM_DATA_SIZE);
 422         transfer = libusb_alloc_transfer(0);
 423         /* Each transfer request gets 100ms to arrive before it's restarted.
 424          * The device only sends 1 transfer/second no matter how many
 425          * times you ask, but we want to keep step with the USB events
 426          * handling above. */
 427         libusb_fill_interrupt_transfer(transfer, usb->devhdl,
 428                         VICTOR_ENDPOINT, buf, DMM_DATA_SIZE, receive_transfer,
 429                         cb_data, 100);
 430         if ((ret = libusb_submit_transfer(transfer) != 0)) {
 431                 sr_err("Unable to submit transfer: %s.", libusb_error_name(ret));
 432                 libusb_free_transfer(transfer);
 433                 g_free(buf);
 434                 return SR_ERR;
 435         }
 436
 437         return SR_OK;
 438 }
 439
 440 static int hw_dev_acquisition_stop(struct sr_dev_inst *sdi, void *cb_data)
 441 {
 442         (void)cb_data;
 443
 444         if (!di->priv) {
 445                 sr_err("Driver was not initialized.");
 446                 return SR_ERR;
 447         }
 448
 449         if (sdi->status != SR_ST_ACTIVE) {
 450                 sr_err("Device not active, can't stop acquisition.");
 451                 return SR_ERR;
 452         }
 453
 454         sdi->status = SR_ST_STOPPING;
 455
 456         return SR_OK;
 457 }
 458
 459 SR_PRIV struct sr_dev_driver victor_dmm_driver_info = {
 460         .name = "victor-dmm",
 461         .longname = "Victor DMMs",
 462         .api_version = 1,
 463         .init = hw_init,
 464         .cleanup = hw_cleanup,
 465         .scan = hw_scan,
 466         .dev_list = hw_dev_list,
 467         .dev_clear = clear_instances,
 468         .config_get = config_get,
 469         .config_set = config_set,
 470         .config_list = config_list,
 471         .dev_open = hw_dev_open,
 472         .dev_close = hw_dev_close,
 473         .dev_acquisition_start = hw_dev_acquisition_start,
 474         .dev_acquisition_stop = hw_dev_acquisition_stop,
 475         .priv = NULL,
 476 };