src/hardware/beaglelogic/api.c

   1 /*
   2  * This file is part of the libsigrok project.
   3  *
   4  * Copyright (C) 2014 Kumar Abhishek <abhishek@theembeddedkitchen.net>
   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 "protocol.h"
  21 #include "beaglelogic.h"
  22
  23 SR_PRIV struct sr_dev_driver beaglelogic_driver_info;
  24
  25 /* Scan options */
  26 static const uint32_t scanopts[] = {
  27         SR_CONF_NUM_LOGIC_CHANNELS,
  28 };
  29
  30 /* Hardware capabilities */
  31 static const uint32_t devopts[] = {
  32         SR_CONF_LOGIC_ANALYZER,
  33         SR_CONF_CONTINUOUS,
  34         SR_CONF_LIMIT_SAMPLES | SR_CONF_GET | SR_CONF_SET,
  35         SR_CONF_SAMPLERATE | SR_CONF_GET | SR_CONF_SET,
  36         SR_CONF_TRIGGER_MATCH | SR_CONF_LIST,
  37         SR_CONF_CAPTURE_RATIO | SR_CONF_GET | SR_CONF_SET,
  38         SR_CONF_NUM_LOGIC_CHANNELS | SR_CONF_GET,
  39 };
  40
  41 /* Trigger matching capabilities */
  42 static const int32_t soft_trigger_matches[] = {
  43         SR_TRIGGER_ZERO,
  44         SR_TRIGGER_ONE,
  45         SR_TRIGGER_RISING,
  46         SR_TRIGGER_FALLING,
  47         SR_TRIGGER_EDGE,
  48 };
  49
  50 SR_PRIV const char *channel_names[] = {
  51         "P8_45", "P8_46", "P8_43", "P8_44", "P8_41", "P8_42", "P8_39",
  52         "P8_40", "P8_27", "P8_29", "P8_28", "P8_30", "P8_21", "P8_20",
  53 };
  54
  55 /* Possible sample rates : 10 Hz to 100 MHz = (100 / x) MHz */
  56 static const uint64_t samplerates[] = {
  57         SR_HZ(10),
  58         SR_MHZ(100),
  59         SR_HZ(1),
  60 };
  61
  62 static int init(struct sr_dev_driver *di, struct sr_context *sr_ctx)
  63 {
  64         return std_init(sr_ctx, di, LOG_PREFIX);
  65 }
  66
  67 static struct dev_context *beaglelogic_devc_alloc(void)
  68 {
  69         struct dev_context *devc;
  70
  71         devc = g_malloc0(sizeof(struct dev_context));
  72
  73         /* Default non-zero values (if any) */
  74         devc->fd = -1;
  75         devc->limit_samples = (uint64_t)-1;
  76
  77         return devc;
  78 }
  79
  80 static GSList *scan(struct sr_dev_driver *di, GSList *options)
  81 {
  82         struct drv_context *drvc;
  83         GSList *devices, *l;
  84         struct sr_config *src;
  85         struct sr_dev_inst *sdi;
  86         struct dev_context *devc;
  87         int i, maxch;
  88
  89         devices = NULL;
  90         drvc = di->context;
  91         drvc->instances = NULL;
  92
  93         /* Probe for /dev/beaglelogic */
  94         if (!g_file_test(BEAGLELOGIC_DEV_NODE, G_FILE_TEST_EXISTS))
  95                 return NULL;
  96
  97         sdi = g_malloc0(sizeof(struct sr_dev_inst));
  98         sdi->status = SR_ST_INACTIVE;
  99         sdi->model = g_strdup("BeagleLogic");
 100         sdi->version = g_strdup("1.0");
 101         sdi->driver = di;
 102
 103         /* Unless explicitly specified, keep max channels to 8 only */
 104         maxch = 8;
 105         for (l = options; l; l = l->next) {
 106                 src = l->data;
 107                 if (src->key == SR_CONF_NUM_LOGIC_CHANNELS)
 108                         maxch = g_variant_get_int32(src->data);
 109         }
 110
 111         /* We need to test for number of channels by opening the node */
 112         devc = beaglelogic_devc_alloc();
 113
 114         if (beaglelogic_open_nonblock(devc) != SR_OK) {
 115                 g_free(devc);
 116                 sr_dev_inst_free(sdi);
 117
 118                 return NULL;
 119         }
 120
 121         if (maxch > 8) {
 122                 maxch = NUM_CHANNELS;
 123                 devc->sampleunit = BL_SAMPLEUNIT_16_BITS;
 124         } else {
 125                 maxch = 8;
 126                 devc->sampleunit = BL_SAMPLEUNIT_8_BITS;
 127         }
 128
 129         beaglelogic_set_sampleunit(devc);
 130         beaglelogic_close(devc);
 131
 132         /* Signal */
 133         sr_info("BeagleLogic device found at "BEAGLELOGIC_DEV_NODE);
 134
 135         /* Fill the channels */
 136         for (i = 0; i < maxch; i++)
 137                 sr_channel_new(sdi, i, SR_CHANNEL_LOGIC, TRUE,
 138                                 channel_names[i]);
 139
 140         sdi->priv = devc;
 141         drvc->instances = g_slist_append(drvc->instances, sdi);
 142         devices = g_slist_append(devices, sdi);
 143
 144         return devices;
 145 }
 146
 147 static GSList *dev_list(const struct sr_dev_driver *di)
 148 {
 149         return ((struct drv_context *)(di->context))->instances;
 150 }
 151
 152 static int dev_clear(const struct sr_dev_driver *di)
 153 {
 154         return std_dev_clear(di, NULL);
 155 }
 156
 157 static int dev_open(struct sr_dev_inst *sdi)
 158 {
 159         struct dev_context *devc = sdi->priv;
 160
 161         /* Open BeagleLogic */
 162         if (beaglelogic_open_nonblock(devc))
 163                 return SR_ERR;
 164
 165         /* Set fd and local attributes */
 166         devc->pollfd.fd = devc->fd;
 167         devc->pollfd.events = G_IO_IN;
 168         devc->pollfd.revents = 0;
 169
 170         /* Get the default attributes */
 171         beaglelogic_get_samplerate(devc);
 172         beaglelogic_get_sampleunit(devc);
 173         beaglelogic_get_triggerflags(devc);
 174         beaglelogic_get_buffersize(devc);
 175         beaglelogic_get_bufunitsize(devc);
 176
 177         /* Map the kernel capture FIFO for reads, saves 1 level of memcpy */
 178         if (beaglelogic_mmap(devc) != SR_OK) {
 179                 sr_err("Unable to map capture buffer");
 180                 beaglelogic_close(devc);
 181                 return SR_ERR;
 182         }
 183
 184         /* We're good to go now */
 185         sdi->status = SR_ST_ACTIVE;
 186         return SR_OK;
 187 }
 188
 189 static int dev_close(struct sr_dev_inst *sdi)
 190 {
 191         struct dev_context *devc = sdi->priv;
 192
 193         if (sdi->status == SR_ST_ACTIVE) {
 194                 /* Close the memory mapping and the file */
 195                 beaglelogic_munmap(devc);
 196                 beaglelogic_close(devc);
 197         }
 198         sdi->status = SR_ST_INACTIVE;
 199         return SR_OK;
 200 }
 201
 202 static int cleanup(const struct sr_dev_driver *di)
 203 {
 204         struct drv_context *drvc;
 205         struct sr_dev_inst *sdi;
 206         GSList *l;
 207
 208         /* unused driver */
 209         if (!(drvc = di->context))
 210                 return SR_OK;
 211
 212         /* Clean up the instances */
 213         for (l = drvc->instances; l; l = l->next) {
 214                 sdi = l->data;
 215                 di->dev_close(sdi);
 216                 g_free(sdi->priv);
 217                 sr_dev_inst_free(sdi);
 218         }
 219         g_slist_free(drvc->instances);
 220         drvc->instances = NULL;
 221
 222         return SR_OK;
 223 }
 224
 225 static int config_get(uint32_t key, GVariant **data, const struct sr_dev_inst *sdi,
 226                 const struct sr_channel_group *cg)
 227 {
 228         struct dev_context *devc = sdi->priv;
 229
 230         (void)cg;
 231
 232         switch (key) {
 233         case SR_CONF_LIMIT_SAMPLES:
 234                 *data = g_variant_new_uint64(devc->limit_samples);
 235                 break;
 236         case SR_CONF_SAMPLERATE:
 237                 *data = g_variant_new_uint64(devc->cur_samplerate);
 238                 break;
 239         case SR_CONF_CAPTURE_RATIO:
 240                 *data = g_variant_new_uint64(devc->capture_ratio);
 241                 break;
 242         case SR_CONF_NUM_LOGIC_CHANNELS:
 243                 *data = g_variant_new_uint32(g_slist_length(sdi->channels));
 244                 break;
 245         default:
 246                 return SR_ERR_NA;
 247         }
 248
 249         return SR_OK;
 250 }
 251
 252 static int config_set(uint32_t key, GVariant *data, const struct sr_dev_inst *sdi,
 253                 const struct sr_channel_group *cg)
 254 {
 255         struct dev_context *devc = sdi->priv;
 256         uint64_t tmp_u64;
 257
 258         (void)cg;
 259
 260         if (sdi->status != SR_ST_ACTIVE)
 261                 return SR_ERR_DEV_CLOSED;
 262
 263         switch (key) {
 264         case SR_CONF_SAMPLERATE:
 265                 devc->cur_samplerate = g_variant_get_uint64(data);
 266                 return beaglelogic_set_samplerate(devc);
 267         case SR_CONF_LIMIT_SAMPLES:
 268                 tmp_u64 = g_variant_get_uint64(data);
 269                 devc->limit_samples = tmp_u64;
 270                 devc->triggerflags = BL_TRIGGERFLAGS_ONESHOT;
 271
 272                 /* Check if we have sufficient buffer size */
 273                 tmp_u64 *= SAMPLEUNIT_TO_BYTES(devc->sampleunit);
 274                 if (tmp_u64 > devc->buffersize) {
 275                         sr_warn("Insufficient buffer space has been allocated.");
 276                         sr_warn("Please use \'echo <size in bytes> > "\
 277                                 BEAGLELOGIC_SYSFS_ATTR(memalloc) \
 278                                 "\' as root to increase the buffer size, this"\
 279                                 " capture is now truncated to %d Msamples",
 280                                 devc->buffersize /
 281                                 (SAMPLEUNIT_TO_BYTES(devc->sampleunit) * 1000000));
 282                 }
 283                 return beaglelogic_set_triggerflags(devc);
 284         case SR_CONF_CAPTURE_RATIO:
 285                 devc->capture_ratio = g_variant_get_uint64(data);
 286                 if (devc->capture_ratio > 100) {
 287                         devc->capture_ratio = 0;
 288                         return SR_ERR;
 289                 }
 290                 return SR_OK;
 291         default:
 292                 return SR_ERR_NA;
 293         }
 294
 295         return SR_OK;
 296 }
 297
 298 static int config_list(uint32_t key, GVariant **data, const struct sr_dev_inst *sdi,
 299                 const struct sr_channel_group *cg)
 300 {
 301         int ret;
 302         GVariant *gvar;
 303         GVariantBuilder gvb;
 304
 305         (void)sdi;
 306         (void)cg;
 307
 308         ret = SR_OK;
 309         switch (key) {
 310         case SR_CONF_SCAN_OPTIONS:
 311                 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
 312                                 scanopts, ARRAY_SIZE(scanopts), sizeof(uint32_t));
 313                 break;
 314         case SR_CONF_DEVICE_OPTIONS:
 315                 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
 316                                 devopts, ARRAY_SIZE(devopts), sizeof(uint32_t));
 317                 break;
 318         case SR_CONF_SAMPLERATE:
 319                 g_variant_builder_init(&gvb, G_VARIANT_TYPE("a{sv}"));
 320                 gvar = g_variant_new_fixed_array(G_VARIANT_TYPE("t"),
 321                         samplerates, ARRAY_SIZE(samplerates), sizeof(uint64_t));
 322                 g_variant_builder_add(&gvb, "{sv}", "samplerate-steps", gvar);
 323                 *data = g_variant_builder_end(&gvb);
 324                 break;
 325         case SR_CONF_TRIGGER_MATCH:
 326                 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_INT32,
 327                                 soft_trigger_matches, ARRAY_SIZE(soft_trigger_matches),
 328                                 sizeof(int32_t));
 329                 break;
 330         default:
 331                 return SR_ERR_NA;
 332         }
 333
 334         return ret;
 335 }
 336
 337 /* get a sane timeout for poll() */
 338 #define BUFUNIT_TIMEOUT_MS(devc)        (100 + ((devc->bufunitsize * 1000) / \
 339                                 (uint32_t)(devc->cur_samplerate)))
 340
 341 static int dev_acquisition_start(const struct sr_dev_inst *sdi,
 342                                     void *cb_data)
 343 {
 344         (void)cb_data;
 345         struct dev_context *devc = sdi->priv;
 346         struct sr_trigger *trigger;
 347
 348         if (sdi->status != SR_ST_ACTIVE)
 349                 return SR_ERR_DEV_CLOSED;
 350
 351         /* Save user pointer */
 352         devc->cb_data = cb_data;
 353
 354         /* Clear capture state */
 355         devc->bytes_read = 0;
 356         devc->offset = 0;
 357
 358         /* Configure channels */
 359         devc->sampleunit = g_slist_length(sdi->channels) > 8 ?
 360                         BL_SAMPLEUNIT_16_BITS : BL_SAMPLEUNIT_8_BITS;
 361         beaglelogic_set_sampleunit(devc);
 362
 363         /* Configure triggers & send header packet */
 364         if ((trigger = sr_session_trigger_get(sdi->session))) {
 365                 int pre_trigger_samples = 0;
 366                 if (devc->limit_samples > 0)
 367                         pre_trigger_samples = devc->capture_ratio * devc->limit_samples/100;
 368                 devc->stl = soft_trigger_logic_new(sdi, trigger, pre_trigger_samples);
 369                 if (!devc->stl)
 370                         return SR_ERR_MALLOC;
 371                 devc->trigger_fired = FALSE;
 372         } else
 373                 devc->trigger_fired = TRUE;
 374         std_session_send_df_header(cb_data, LOG_PREFIX);
 375
 376         /* Trigger and add poll on file */
 377         beaglelogic_start(devc);
 378         sr_session_source_add_pollfd(sdi->session, &devc->pollfd,
 379                         BUFUNIT_TIMEOUT_MS(devc), beaglelogic_receive_data,
 380                         (void *)sdi);
 381
 382         return SR_OK;
 383 }
 384
 385 static int dev_acquisition_stop(struct sr_dev_inst *sdi, void *cb_data)
 386 {
 387         struct dev_context *devc = sdi->priv;
 388         struct sr_datafeed_packet pkt;
 389
 390         (void)cb_data;
 391
 392         if (sdi->status != SR_ST_ACTIVE)
 393                 return SR_ERR_DEV_CLOSED;
 394
 395         /* Execute a stop on BeagleLogic */
 396         beaglelogic_stop(devc);
 397
 398         /* lseek to offset 0, flushes the cache */
 399         lseek(devc->fd, 0, SEEK_SET);
 400
 401         /* Remove session source and send EOT packet */
 402         sr_session_source_remove_pollfd(sdi->session, &devc->pollfd);
 403         pkt.type = SR_DF_END;
 404         pkt.payload = NULL;
 405         sr_session_send(sdi, &pkt);
 406
 407         return SR_OK;
 408 }
 409
 410 SR_PRIV struct sr_dev_driver beaglelogic_driver_info = {
 411         .name = "beaglelogic",
 412         .longname = "BeagleLogic",
 413         .api_version = 1,
 414         .init = init,
 415         .cleanup = cleanup,
 416         .scan = scan,
 417         .dev_list = dev_list,
 418         .dev_clear = dev_clear,
 419         .config_get = config_get,
 420         .config_set = config_set,
 421         .config_list = config_list,
 422         .dev_open = dev_open,
 423         .dev_close = dev_close,
 424         .dev_acquisition_start = dev_acquisition_start,
 425         .dev_acquisition_stop = dev_acquisition_stop,
 426         .context = NULL,
 427 };