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