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 static const uint32_t scanopts[] = {
  25         SR_CONF_CONN,
  26         SR_CONF_NUM_LOGIC_CHANNELS,
  27 };
  28
  29 static const uint32_t drvopts[] = {
  30         SR_CONF_LOGIC_ANALYZER,
  31 };
  32
  33 static const uint32_t devopts[] = {
  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 static const int32_t 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 struct dev_context *beaglelogic_devc_alloc(void)
  63 {
  64         struct dev_context *devc;
  65
  66         devc = g_malloc0(sizeof(struct dev_context));
  67
  68         /* Default non-zero values (if any) */
  69         devc->fd = -1;
  70         devc->limit_samples = (uint64_t)-1;
  71         devc->tcp_buffer = 0;
  72
  73         return devc;
  74 }
  75
  76 static GSList *scan(struct sr_dev_driver *di, GSList *options)
  77 {
  78         GSList *l;
  79         struct sr_config *src;
  80         struct sr_dev_inst *sdi;
  81         struct dev_context *devc;
  82         const char *conn = NULL;
  83         gchar **params;
  84         int i, maxch;
  85
  86         maxch = NUM_CHANNELS;
  87         for (l = options; l; l = l->next) {
  88                 src = l->data;
  89                 if (src->key == SR_CONF_NUM_LOGIC_CHANNELS)
  90                         maxch = g_variant_get_int32(src->data);
  91                 if (src->key == SR_CONF_CONN)
  92                         conn = g_variant_get_string(src->data, NULL);
  93         }
  94
  95         /* Probe for /dev/beaglelogic if not connecting via TCP */
  96         if (conn == NULL) {
  97                 if (!g_file_test(BEAGLELOGIC_DEV_NODE, G_FILE_TEST_EXISTS))
  98                         return NULL;
  99         } else {
 100                 params = g_strsplit(conn, "/", 0);
 101                 if (!params || !params[1] || !params[2]) {
 102                         sr_err("Invalid Parameters.");
 103                         g_strfreev(params);
 104                         return NULL;
 105                 }
 106                 if (g_ascii_strncasecmp(params[0], "tcp", 3)) {
 107                         sr_err("Only TCP (tcp-raw) protocol is currently supported.");
 108                         g_strfreev(params);
 109                         return NULL;
 110                 }
 111         }
 112
 113         if (maxch > 8)
 114                 maxch = NUM_CHANNELS;
 115         else
 116                 maxch = 8;
 117
 118         sdi = g_new0(struct sr_dev_inst, 1);
 119         sdi->status = SR_ST_INACTIVE;
 120         sdi->model = g_strdup("BeagleLogic");
 121         sdi->version = g_strdup("1.0");
 122
 123         devc = beaglelogic_devc_alloc();
 124
 125         if (conn == NULL) {
 126                 devc->beaglelogic = &beaglelogic_native_ops;
 127                 sr_info("BeagleLogic device found at "BEAGLELOGIC_DEV_NODE);
 128         } else {
 129                 devc->read_timeout = 1000 * 1000;
 130                 devc->beaglelogic = &beaglelogic_tcp_ops;
 131                 devc->address = g_strdup(params[1]);
 132                 devc->port = g_strdup(params[2]);
 133                 g_strfreev(params);
 134
 135                 if (devc->beaglelogic->open(devc) != SR_OK)
 136                         goto err_free;
 137                 if (beaglelogic_tcp_detect(devc) != SR_OK)
 138                         goto err_free;
 139                 sr_info("BeagleLogic device found at %s : %s",
 140                         devc->address, devc->port);
 141         }
 142         /* Fill the channels */
 143         for (i = 0; i < maxch; i++)
 144                 sr_channel_new(sdi, i, SR_CHANNEL_LOGIC, TRUE,
 145                                 channel_names[i]);
 146
 147         sdi->priv = devc;
 148
 149         return std_scan_complete(di, g_slist_append(NULL, sdi));
 150 err_free:
 151         g_free(sdi->model);
 152         g_free(sdi->version);
 153         g_free(devc);
 154         g_free(sdi);
 155
 156         return NULL;
 157 }
 158
 159 static int dev_open(struct sr_dev_inst *sdi)
 160 {
 161         struct dev_context *devc = sdi->priv;
 162
 163         /* Open BeagleLogic */
 164         if (devc->beaglelogic == &beaglelogic_native_ops)
 165                 if (devc->beaglelogic->open(devc))
 166                         return SR_ERR;
 167
 168         /* Set fd and local attributes */
 169         if (devc->beaglelogic == &beaglelogic_tcp_ops)
 170                 devc->pollfd.fd = devc->socket;
 171         else
 172                 devc->pollfd.fd = devc->fd;
 173         devc->pollfd.events = G_IO_IN;
 174         devc->pollfd.revents = 0;
 175
 176         /* Get the default attributes */
 177         devc->beaglelogic->get_samplerate(devc);
 178         devc->beaglelogic->get_sampleunit(devc);
 179         devc->beaglelogic->get_buffersize(devc);
 180         devc->beaglelogic->get_bufunitsize(devc);
 181
 182         /* Set the triggerflags to default for continuous capture unless we
 183          * explicitly limit samples using SR_CONF_LIMIT_SAMPLES */
 184         devc->triggerflags = BL_TRIGGERFLAGS_CONTINUOUS;
 185         devc->beaglelogic->set_triggerflags(devc);
 186
 187         /* Map the kernel capture FIFO for reads, saves 1 level of memcpy */
 188         if (devc->beaglelogic == &beaglelogic_native_ops) {
 189                 if (devc->beaglelogic->mmap(devc) != SR_OK) {
 190                         sr_err("Unable to map capture buffer");
 191                         devc->beaglelogic->close(devc);
 192                         return SR_ERR;
 193                 }
 194         } else {
 195                 devc->tcp_buffer = g_malloc(TCP_BUFFER_SIZE);
 196         }
 197
 198         return SR_OK;
 199 }
 200
 201 static int dev_close(struct sr_dev_inst *sdi)
 202 {
 203         struct dev_context *devc = sdi->priv;
 204
 205         /* Close the memory mapping and the file */
 206         if (devc->beaglelogic == &beaglelogic_native_ops)
 207                 devc->beaglelogic->munmap(devc);
 208         devc->beaglelogic->close(devc);
 209
 210         if (devc->tcp_buffer)
 211                 g_free(devc->tcp_buffer);
 212
 213         return SR_OK;
 214 }
 215
 216 static int config_get(uint32_t key, GVariant **data,
 217         const struct sr_dev_inst *sdi, const struct sr_channel_group *cg)
 218 {
 219         struct dev_context *devc = sdi->priv;
 220
 221         (void)cg;
 222
 223         switch (key) {
 224         case SR_CONF_LIMIT_SAMPLES:
 225                 *data = g_variant_new_uint64(devc->limit_samples);
 226                 break;
 227         case SR_CONF_SAMPLERATE:
 228                 *data = g_variant_new_uint64(devc->cur_samplerate);
 229                 break;
 230         case SR_CONF_CAPTURE_RATIO:
 231                 *data = g_variant_new_uint64(devc->capture_ratio);
 232                 break;
 233         case SR_CONF_NUM_LOGIC_CHANNELS:
 234                 *data = g_variant_new_uint32(g_slist_length(sdi->channels));
 235                 break;
 236         default:
 237                 return SR_ERR_NA;
 238         }
 239
 240         return SR_OK;
 241 }
 242
 243 static int config_set(uint32_t key, GVariant *data,
 244         const struct sr_dev_inst *sdi, const struct sr_channel_group *cg)
 245 {
 246         struct dev_context *devc = sdi->priv;
 247         uint64_t tmp_u64;
 248
 249         (void)cg;
 250
 251         switch (key) {
 252         case SR_CONF_SAMPLERATE:
 253                 devc->cur_samplerate = g_variant_get_uint64(data);
 254                 return devc->beaglelogic->set_samplerate(devc);
 255         case SR_CONF_LIMIT_SAMPLES:
 256                 tmp_u64 = g_variant_get_uint64(data);
 257                 devc->limit_samples = tmp_u64;
 258                 devc->triggerflags = BL_TRIGGERFLAGS_ONESHOT;
 259
 260                 /* Check if we have sufficient buffer size */
 261                 tmp_u64 *= SAMPLEUNIT_TO_BYTES(devc->sampleunit);
 262                 if (tmp_u64 > devc->buffersize) {
 263                         sr_warn("Insufficient buffer space has been allocated.");
 264                         sr_warn("Please use \'echo <size in bytes> > "\
 265                                 BEAGLELOGIC_SYSFS_ATTR(memalloc) \
 266                                 "\' to increase the buffer size, this"\
 267                                 " capture is now truncated to %d Msamples",
 268                                 devc->buffersize /
 269                                 (SAMPLEUNIT_TO_BYTES(devc->sampleunit) * 1000000));
 270                 }
 271                 return devc->beaglelogic->set_triggerflags(devc);
 272         case SR_CONF_CAPTURE_RATIO:
 273                 devc->capture_ratio = g_variant_get_uint64(data);
 274                 break;
 275         default:
 276                 return SR_ERR_NA;
 277         }
 278
 279         return SR_OK;
 280 }
 281
 282 static int config_list(uint32_t key, GVariant **data,
 283         const struct sr_dev_inst *sdi, const struct sr_channel_group *cg)
 284 {
 285         switch (key) {
 286         case SR_CONF_SCAN_OPTIONS:
 287         case SR_CONF_DEVICE_OPTIONS:
 288                 return STD_CONFIG_LIST(key, data, sdi, cg, scanopts, drvopts, devopts);
 289         case SR_CONF_SAMPLERATE:
 290                 *data = std_gvar_samplerates_steps(ARRAY_AND_SIZE(samplerates));
 291                 break;
 292         case SR_CONF_TRIGGER_MATCH:
 293                 *data = std_gvar_array_i32(ARRAY_AND_SIZE(trigger_matches));
 294                 break;
 295         default:
 296                 return SR_ERR_NA;
 297         }
 298
 299         return SR_OK;
 300 }
 301
 302 /* get a sane timeout for poll() */
 303 #define BUFUNIT_TIMEOUT_MS(devc)        (100 + ((devc->bufunitsize * 1000) / \
 304                                 (uint32_t)(devc->cur_samplerate)))
 305
 306 static int dev_acquisition_start(const struct sr_dev_inst *sdi)
 307 {
 308         struct dev_context *devc = sdi->priv;
 309         GSList *l;
 310         struct sr_trigger *trigger;
 311         struct sr_channel *channel;
 312
 313         /* Clear capture state */
 314         devc->bytes_read = 0;
 315         devc->offset = 0;
 316
 317         /* Configure channels */
 318         devc->sampleunit = BL_SAMPLEUNIT_8_BITS;
 319
 320         for (l = sdi->channels; l; l = l->next) {
 321                 channel = l->data;
 322                 if (channel->index >= 8 && channel->enabled)
 323                         devc->sampleunit = BL_SAMPLEUNIT_16_BITS;
 324         }
 325         devc->beaglelogic->set_sampleunit(devc);
 326
 327         /* Configure triggers & send header packet */
 328         if ((trigger = sr_session_trigger_get(sdi->session))) {
 329                 int pre_trigger_samples = 0;
 330                 if (devc->limit_samples > 0)
 331                         pre_trigger_samples = (devc->capture_ratio * devc->limit_samples) / 100;
 332                 devc->stl = soft_trigger_logic_new(sdi, trigger, pre_trigger_samples);
 333                 if (!devc->stl)
 334                         return SR_ERR_MALLOC;
 335                 devc->trigger_fired = FALSE;
 336         } else
 337                 devc->trigger_fired = TRUE;
 338         std_session_send_df_header(sdi);
 339
 340         /* Trigger and add poll on file */
 341         devc->beaglelogic->start(devc);
 342         if (devc->beaglelogic == &beaglelogic_native_ops)
 343                 sr_session_source_add_pollfd(sdi->session, &devc->pollfd,
 344                         BUFUNIT_TIMEOUT_MS(devc), beaglelogic_native_receive_data,
 345                         (void *)sdi);
 346         else
 347                 sr_session_source_add_pollfd(sdi->session, &devc->pollfd,
 348                         BUFUNIT_TIMEOUT_MS(devc), beaglelogic_tcp_receive_data,
 349                         (void *)sdi);
 350
 351         return SR_OK;
 352 }
 353
 354 static int dev_acquisition_stop(struct sr_dev_inst *sdi)
 355 {
 356         struct dev_context *devc = sdi->priv;
 357
 358         /* Execute a stop on BeagleLogic */
 359         devc->beaglelogic->stop(devc);
 360
 361         /* lseek to offset 0, flushes the cache */
 362         if (devc->beaglelogic == &beaglelogic_native_ops)
 363                 lseek(devc->fd, 0, SEEK_SET);
 364
 365         /* Remove session source and send EOT packet */
 366         sr_session_source_remove_pollfd(sdi->session, &devc->pollfd);
 367         std_session_send_df_end(sdi);
 368
 369         return SR_OK;
 370 }
 371
 372 static struct sr_dev_driver beaglelogic_driver_info = {
 373         .name = "beaglelogic",
 374         .longname = "BeagleLogic",
 375         .api_version = 1,
 376         .init = std_init,
 377         .cleanup = std_cleanup,
 378         .scan = scan,
 379         .dev_list = std_dev_list,
 380         .dev_clear = std_dev_clear,
 381         .config_get = config_get,
 382         .config_set = config_set,
 383         .config_list = config_list,
 384         .dev_open = dev_open,
 385         .dev_close = dev_close,
 386         .dev_acquisition_start = dev_acquisition_start,
 387         .dev_acquisition_stop = dev_acquisition_stop,
 388         .context = NULL,
 389 };
 390 SR_REGISTER_DEV_DRIVER(beaglelogic_driver_info);