src/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 <config.h>
  21 #include <glib.h>
  22 #include <libusb.h>
  23 #include <stdlib.h>
  24 #include <string.h>
  25 #include <libsigrok/libsigrok.h>
  26 #include "libsigrok-internal.h"
  27 #include "protocol.h"
  28
  29 #define VICTOR_VID 0x1244
  30 #define VICTOR_PID 0xd237
  31 #define VICTOR_VENDOR "Victor"
  32 #define VICTOR_INTERFACE 0
  33 #define VICTOR_ENDPOINT (LIBUSB_ENDPOINT_IN | 1)
  34
  35 SR_PRIV struct sr_dev_driver victor_dmm_driver_info;
  36 static int dev_acquisition_stop(struct sr_dev_inst *sdi, void *cb_data);
  37
  38 static const uint32_t drvopts[] = {
  39         SR_CONF_MULTIMETER,
  40 };
  41
  42 static const uint32_t scanopts[] = {
  43         SR_CONF_CONN,
  44 };
  45
  46 static const uint32_t devopts[] = {
  47         SR_CONF_CONTINUOUS,
  48         SR_CONF_LIMIT_SAMPLES | SR_CONF_SET,
  49         SR_CONF_LIMIT_MSEC | SR_CONF_SET,
  50         SR_CONF_CONN | SR_CONF_GET,
  51 };
  52
  53 static int init(struct sr_dev_driver *di, struct sr_context *sr_ctx)
  54 {
  55         return std_init(sr_ctx, di, LOG_PREFIX);
  56 }
  57
  58 static GSList *scan(struct sr_dev_driver *di, GSList *options)
  59 {
  60         struct drv_context *drvc;
  61         struct dev_context *devc;
  62         struct sr_dev_inst *sdi;
  63         struct libusb_device_descriptor des;
  64         libusb_device **devlist;
  65         GSList *devices;
  66         int i;
  67         char connection_id[64];
  68
  69         (void)options;
  70
  71         drvc = di->context;
  72
  73         devices = NULL;
  74         libusb_get_device_list(drvc->sr_ctx->libusb_ctx, &devlist);
  75         for (i = 0; devlist[i]; i++) {
  76                 libusb_get_device_descriptor(devlist[i], &des);
  77
  78                 if (des.idVendor != VICTOR_VID || des.idProduct != VICTOR_PID)
  79                         continue;
  80
  81                 usb_get_port_path(devlist[i], connection_id, sizeof(connection_id));
  82
  83                 sdi = g_malloc0(sizeof(struct sr_dev_inst));
  84                 sdi->status = SR_ST_INACTIVE;
  85                 sdi->vendor = g_strdup(VICTOR_VENDOR);
  86                 sdi->driver = di;
  87                 sdi->connection_id = g_strdup(connection_id);
  88                 devc = g_malloc0(sizeof(struct dev_context));
  89                 sdi->priv = devc;
  90
  91                 sr_channel_new(sdi, 0, SR_CHANNEL_ANALOG, TRUE, "P1");
  92                 sdi->conn = sr_usb_dev_inst_new(libusb_get_bus_number(devlist[i]),
  93                                 libusb_get_device_address(devlist[i]), NULL);
  94                 sdi->inst_type = SR_INST_USB;
  95
  96                 drvc->instances = g_slist_append(drvc->instances, sdi);
  97                 devices = g_slist_append(devices, sdi);
  98         }
  99         libusb_free_device_list(devlist, 1);
 100
 101         return devices;
 102 }
 103
 104 static GSList *dev_list(const struct sr_dev_driver *di)
 105 {
 106         return ((struct drv_context *)(di->context))->instances;
 107 }
 108
 109 static int dev_open(struct sr_dev_inst *sdi)
 110 {
 111         struct sr_dev_driver *di = sdi->driver;
 112         struct drv_context *drvc = di->context;
 113         struct sr_usb_dev_inst *usb;
 114         libusb_device **devlist;
 115         int ret, i;
 116         char connection_id[64];
 117
 118         if (!di->context) {
 119                 sr_err("Driver was not initialized.");
 120                 return SR_ERR;
 121         }
 122
 123         usb = sdi->conn;
 124
 125         libusb_get_device_list(drvc->sr_ctx->libusb_ctx, &devlist);
 126         for (i = 0; devlist[i]; i++) {
 127                 usb_get_port_path(devlist[i], connection_id, sizeof(connection_id));
 128                 if (strcmp(sdi->connection_id, connection_id))
 129                         continue;
 130                 if ((ret = libusb_open(devlist[i], &usb->devhdl))) {
 131                         sr_err("Failed to open device: %s.", libusb_error_name(ret));
 132                         return SR_ERR;
 133                 }
 134                 break;
 135         }
 136         libusb_free_device_list(devlist, 1);
 137         if (!devlist[i]) {
 138                 sr_err("Device not found.");
 139                 return SR_ERR;
 140         }
 141
 142         /* The device reports as HID class, so the kernel would have
 143          * claimed it. */
 144         if (libusb_kernel_driver_active(usb->devhdl, 0) == 1) {
 145                 if ((ret = libusb_detach_kernel_driver(usb->devhdl, 0)) < 0) {
 146                         sr_err("Failed to detach kernel driver: %s.",
 147                                libusb_error_name(ret));
 148                         return SR_ERR;
 149                 }
 150         }
 151
 152         if ((ret = libusb_claim_interface(usb->devhdl,
 153                         VICTOR_INTERFACE))) {
 154                 sr_err("Failed to claim interface: %s.", libusb_error_name(ret));
 155                 return SR_ERR;
 156         }
 157         sdi->status = SR_ST_ACTIVE;
 158
 159         return SR_OK;
 160 }
 161
 162 static int dev_close(struct sr_dev_inst *sdi)
 163 {
 164         struct sr_dev_driver *di = sdi->driver;
 165         struct sr_usb_dev_inst *usb;
 166
 167         if (!di->context) {
 168                 sr_err("Driver was not initialized.");
 169                 return SR_ERR;
 170         }
 171
 172         usb = sdi->conn;
 173
 174         if (!usb->devhdl)
 175                 /*  Nothing to do. */
 176                 return SR_OK;
 177
 178         libusb_release_interface(usb->devhdl, VICTOR_INTERFACE);
 179         libusb_close(usb->devhdl);
 180         usb->devhdl = NULL;
 181         sdi->status = SR_ST_INACTIVE;
 182
 183         return SR_OK;
 184 }
 185
 186 static int cleanup(const struct sr_dev_driver *di)
 187 {
 188         int ret;
 189         struct drv_context *drvc;
 190
 191         if (!(drvc = di->context))
 192                 /* Can get called on an unused driver, doesn't matter. */
 193                 return SR_OK;
 194
 195         ret = std_dev_clear(di, NULL);
 196         g_free(drvc);
 197
 198         return ret;
 199 }
 200
 201 static int config_get(uint32_t key, GVariant **data, const struct sr_dev_inst *sdi,
 202                 const struct sr_channel_group *cg)
 203 {
 204         struct sr_usb_dev_inst *usb;
 205         char str[128];
 206
 207         (void)cg;
 208
 209         switch (key) {
 210         case SR_CONF_CONN:
 211                 if (!sdi || !sdi->conn)
 212                         return SR_ERR_ARG;
 213                 usb = sdi->conn;
 214                 snprintf(str, 128, "%d.%d", usb->bus, usb->address);
 215                 *data = g_variant_new_string(str);
 216                 break;
 217         default:
 218                 return SR_ERR_NA;
 219         }
 220
 221         return SR_OK;
 222 }
 223
 224 static int config_set(uint32_t key, GVariant *data, const struct sr_dev_inst *sdi,
 225                 const struct sr_channel_group *cg)
 226 {
 227         struct sr_dev_driver *di = sdi->driver;
 228         struct dev_context *devc;
 229         gint64 now;
 230
 231         (void)cg;
 232
 233         if (sdi->status != SR_ST_ACTIVE)
 234                 return SR_ERR_DEV_CLOSED;
 235
 236         if (!di->context) {
 237                 sr_err("Driver was not initialized.");
 238                 return SR_ERR;
 239         }
 240
 241         devc = sdi->priv;
 242
 243         switch (key) {
 244         case SR_CONF_LIMIT_MSEC:
 245                 devc->limit_msec = g_variant_get_uint64(data);
 246                 now = g_get_monotonic_time() / 1000;
 247                 devc->end_time = now + devc->limit_msec;
 248                 break;
 249         case SR_CONF_LIMIT_SAMPLES:
 250                 devc->limit_samples = g_variant_get_uint64(data);
 251                 break;
 252         default:
 253                 return SR_ERR_NA;
 254         }
 255
 256         return SR_OK;
 257 }
 258
 259 static int config_list(uint32_t key, GVariant **data, const struct sr_dev_inst *sdi,
 260                 const struct sr_channel_group *cg)
 261 {
 262         (void)sdi;
 263         (void)cg;
 264
 265         switch (key) {
 266         case SR_CONF_SCAN_OPTIONS:
 267                 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
 268                                 scanopts, ARRAY_SIZE(scanopts), sizeof(uint32_t));
 269                 break;
 270         case SR_CONF_DEVICE_OPTIONS:
 271                 if (!sdi)
 272                         *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
 273                                         drvopts, ARRAY_SIZE(drvopts), sizeof(uint32_t));
 274                 else
 275                         *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
 276                                         devopts, ARRAY_SIZE(devopts), sizeof(uint32_t));
 277                 break;
 278         default:
 279                 return SR_ERR_NA;
 280         }
 281
 282         return SR_OK;
 283 }
 284
 285 static void LIBUSB_CALL receive_transfer(struct libusb_transfer *transfer)
 286 {
 287         struct dev_context *devc;
 288         struct sr_dev_inst *sdi;
 289         int ret;
 290
 291         sdi = transfer->user_data;
 292         devc = sdi->priv;
 293         if (transfer->status == LIBUSB_TRANSFER_NO_DEVICE) {
 294                 /* USB device was unplugged. */
 295                 dev_acquisition_stop(sdi, sdi);
 296         } else if (transfer->status == LIBUSB_TRANSFER_COMPLETED) {
 297                 sr_dbg("Got %d-byte packet.", transfer->actual_length);
 298                 if (transfer->actual_length == DMM_DATA_SIZE) {
 299                         victor_dmm_receive_data(sdi, transfer->buffer);
 300                         if (devc->limit_samples) {
 301                                 if (devc->num_samples >= devc->limit_samples)
 302                                         dev_acquisition_stop(sdi, sdi);
 303                         }
 304                 }
 305         }
 306         /* Anything else is either an error or a timeout, which is fine:
 307          * we were just going to send another transfer request anyway. */
 308
 309         if (sdi->status == SR_ST_ACTIVE) {
 310                 /* Send the same request again. */
 311                 if ((ret = libusb_submit_transfer(transfer) != 0)) {
 312                         sr_err("Unable to resubmit transfer: %s.",
 313                                libusb_error_name(ret));
 314                         g_free(transfer->buffer);
 315                         libusb_free_transfer(transfer);
 316                         dev_acquisition_stop(sdi, sdi);
 317                 }
 318         } else {
 319                 /* This was the last transfer we're going to receive, so
 320                  * clean up now. */
 321                 g_free(transfer->buffer);
 322                 libusb_free_transfer(transfer);
 323         }
 324 }
 325
 326 static int handle_events(int fd, int revents, void *cb_data)
 327 {
 328         struct dev_context *devc;
 329         struct drv_context *drvc;
 330         struct sr_dev_inst *sdi;
 331         struct sr_dev_driver *di;
 332         struct timeval tv;
 333         gint64 now;
 334
 335         (void)fd;
 336         (void)revents;
 337
 338         sdi = cb_data;
 339         devc = sdi->priv;
 340         di = sdi->driver;
 341         drvc = di->context;
 342
 343         if (devc->limit_msec) {
 344                 now = g_get_monotonic_time() / 1000;
 345                 if (now > devc->end_time)
 346                         dev_acquisition_stop(sdi, sdi);
 347         }
 348
 349         if (sdi->status == SR_ST_STOPPING) {
 350                 usb_source_remove(sdi->session, drvc->sr_ctx);
 351                 dev_close(sdi);
 352                 std_session_send_df_end(sdi, LOG_PREFIX);
 353         }
 354
 355         memset(&tv, 0, sizeof(struct timeval));
 356         libusb_handle_events_timeout_completed(drvc->sr_ctx->libusb_ctx, &tv,
 357                                                NULL);
 358
 359         return TRUE;
 360 }
 361
 362 static int dev_acquisition_start(const struct sr_dev_inst *sdi, void *cb_data)
 363 {
 364         struct sr_dev_driver *di = sdi->driver;
 365         struct dev_context *devc;
 366         struct drv_context *drvc = di->context;
 367         struct sr_usb_dev_inst *usb;
 368         struct libusb_transfer *transfer;
 369         int ret;
 370         unsigned char *buf;
 371
 372         if (sdi->status != SR_ST_ACTIVE)
 373                 return SR_ERR_DEV_CLOSED;
 374
 375         if (!di->context) {
 376                 sr_err("Driver was not initialized.");
 377                 return SR_ERR;
 378         }
 379
 380         devc = sdi->priv;
 381         usb = sdi->conn;
 382         devc->cb_data = cb_data;
 383
 384         std_session_send_df_header(cb_data, LOG_PREFIX);
 385
 386         usb_source_add(sdi->session, drvc->sr_ctx, 100,
 387                         handle_events, (void *)sdi);
 388
 389         buf = g_malloc(DMM_DATA_SIZE);
 390         transfer = libusb_alloc_transfer(0);
 391         /* Each transfer request gets 100ms to arrive before it's restarted.
 392          * The device only sends 1 transfer/second no matter how many
 393          * times you ask, but we want to keep step with the USB events
 394          * handling above. */
 395         libusb_fill_interrupt_transfer(transfer, usb->devhdl,
 396                         VICTOR_ENDPOINT, buf, DMM_DATA_SIZE, receive_transfer,
 397                         cb_data, 100);
 398         if ((ret = libusb_submit_transfer(transfer) != 0)) {
 399                 sr_err("Unable to submit transfer: %s.", libusb_error_name(ret));
 400                 libusb_free_transfer(transfer);
 401                 g_free(buf);
 402                 return SR_ERR;
 403         }
 404
 405         return SR_OK;
 406 }
 407
 408 static int dev_acquisition_stop(struct sr_dev_inst *sdi, void *cb_data)
 409 {
 410         struct sr_dev_driver *di = sdi->driver;
 411         (void)cb_data;
 412
 413         if (!di->context) {
 414                 sr_err("Driver was not initialized.");
 415                 return SR_ERR;
 416         }
 417
 418         if (sdi->status != SR_ST_ACTIVE) {
 419                 sr_err("Device not active, can't stop acquisition.");
 420                 return SR_ERR;
 421         }
 422
 423         sdi->status = SR_ST_STOPPING;
 424
 425         return SR_OK;
 426 }
 427
 428 SR_PRIV struct sr_dev_driver victor_dmm_driver_info = {
 429         .name = "victor-dmm",
 430         .longname = "Victor DMMs",
 431         .api_version = 1,
 432         .init = init,
 433         .cleanup = cleanup,
 434         .scan = scan,
 435         .dev_list = dev_list,
 436         .dev_clear = NULL,
 437         .config_get = config_get,
 438         .config_set = config_set,
 439         .config_list = config_list,
 440         .dev_open = dev_open,
 441         .dev_close = dev_close,
 442         .dev_acquisition_start = dev_acquisition_start,
 443         .dev_acquisition_stop = dev_acquisition_stop,
 444         .context = NULL,
 445 };