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_open(struct sr_dev_inst *sdi)
 154 {
 155         struct dev_context *devc = sdi->priv;
 156
 157         /* Open BeagleLogic */
 158         if (beaglelogic_open_nonblock(devc))
 159                 return SR_ERR;
 160
 161         /* Set fd and local attributes */
 162         devc->pollfd.fd = devc->fd;
 163         devc->pollfd.events = G_IO_IN;
 164         devc->pollfd.revents = 0;
 165
 166         /* Get the default attributes */
 167         beaglelogic_get_samplerate(devc);
 168         beaglelogic_get_sampleunit(devc);
 169         beaglelogic_get_triggerflags(devc);
 170         beaglelogic_get_buffersize(devc);
 171         beaglelogic_get_bufunitsize(devc);
 172
 173         /* Map the kernel capture FIFO for reads, saves 1 level of memcpy */
 174         if (beaglelogic_mmap(devc) != SR_OK) {
 175                 sr_err("Unable to map capture buffer");
 176                 beaglelogic_close(devc);
 177                 return SR_ERR;
 178         }
 179
 180         /* We're good to go now */
 181         sdi->status = SR_ST_ACTIVE;
 182         return SR_OK;
 183 }
 184
 185 static int dev_close(struct sr_dev_inst *sdi)
 186 {
 187         struct dev_context *devc = sdi->priv;
 188
 189         if (sdi->status == SR_ST_ACTIVE) {
 190                 /* Close the memory mapping and the file */
 191                 beaglelogic_munmap(devc);
 192                 beaglelogic_close(devc);
 193         }
 194         sdi->status = SR_ST_INACTIVE;
 195         return SR_OK;
 196 }
 197
 198 static int config_get(uint32_t key, GVariant **data, const struct sr_dev_inst *sdi,
 199                 const struct sr_channel_group *cg)
 200 {
 201         struct dev_context *devc = sdi->priv;
 202
 203         (void)cg;
 204
 205         switch (key) {
 206         case SR_CONF_LIMIT_SAMPLES:
 207                 *data = g_variant_new_uint64(devc->limit_samples);
 208                 break;
 209         case SR_CONF_SAMPLERATE:
 210                 *data = g_variant_new_uint64(devc->cur_samplerate);
 211                 break;
 212         case SR_CONF_CAPTURE_RATIO:
 213                 *data = g_variant_new_uint64(devc->capture_ratio);
 214                 break;
 215         case SR_CONF_NUM_LOGIC_CHANNELS:
 216                 *data = g_variant_new_uint32(g_slist_length(sdi->channels));
 217                 break;
 218         default:
 219                 return SR_ERR_NA;
 220         }
 221
 222         return SR_OK;
 223 }
 224
 225 static int config_set(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         uint64_t tmp_u64;
 230
 231         (void)cg;
 232
 233         if (sdi->status != SR_ST_ACTIVE)
 234                 return SR_ERR_DEV_CLOSED;
 235
 236         switch (key) {
 237         case SR_CONF_SAMPLERATE:
 238                 devc->cur_samplerate = g_variant_get_uint64(data);
 239                 return beaglelogic_set_samplerate(devc);
 240         case SR_CONF_LIMIT_SAMPLES:
 241                 tmp_u64 = g_variant_get_uint64(data);
 242                 devc->limit_samples = tmp_u64;
 243                 devc->triggerflags = BL_TRIGGERFLAGS_ONESHOT;
 244
 245                 /* Check if we have sufficient buffer size */
 246                 tmp_u64 *= SAMPLEUNIT_TO_BYTES(devc->sampleunit);
 247                 if (tmp_u64 > devc->buffersize) {
 248                         sr_warn("Insufficient buffer space has been allocated.");
 249                         sr_warn("Please use \'echo <size in bytes> > "\
 250                                 BEAGLELOGIC_SYSFS_ATTR(memalloc) \
 251                                 "\' as root to increase the buffer size, this"\
 252                                 " capture is now truncated to %d Msamples",
 253                                 devc->buffersize /
 254                                 (SAMPLEUNIT_TO_BYTES(devc->sampleunit) * 1000000));
 255                 }
 256                 return beaglelogic_set_triggerflags(devc);
 257         case SR_CONF_CAPTURE_RATIO:
 258                 devc->capture_ratio = g_variant_get_uint64(data);
 259                 if (devc->capture_ratio > 100)
 260                         return SR_ERR;
 261                 return SR_OK;
 262         default:
 263                 return SR_ERR_NA;
 264         }
 265
 266         return SR_OK;
 267 }
 268
 269 static int config_list(uint32_t key, GVariant **data, const struct sr_dev_inst *sdi,
 270                 const struct sr_channel_group *cg)
 271 {
 272         int ret;
 273         GVariant *gvar;
 274         GVariantBuilder gvb;
 275
 276         (void)sdi;
 277         (void)cg;
 278
 279         ret = SR_OK;
 280         switch (key) {
 281         case SR_CONF_SCAN_OPTIONS:
 282                 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
 283                                 scanopts, ARRAY_SIZE(scanopts), sizeof(uint32_t));
 284                 break;
 285         case SR_CONF_DEVICE_OPTIONS:
 286                 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
 287                                 devopts, ARRAY_SIZE(devopts), sizeof(uint32_t));
 288                 break;
 289         case SR_CONF_SAMPLERATE:
 290                 g_variant_builder_init(&gvb, G_VARIANT_TYPE("a{sv}"));
 291                 gvar = g_variant_new_fixed_array(G_VARIANT_TYPE("t"),
 292                         samplerates, ARRAY_SIZE(samplerates), sizeof(uint64_t));
 293                 g_variant_builder_add(&gvb, "{sv}", "samplerate-steps", gvar);
 294                 *data = g_variant_builder_end(&gvb);
 295                 break;
 296         case SR_CONF_TRIGGER_MATCH:
 297                 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_INT32,
 298                                 soft_trigger_matches, ARRAY_SIZE(soft_trigger_matches),
 299                                 sizeof(int32_t));
 300                 break;
 301         default:
 302                 return SR_ERR_NA;
 303         }
 304
 305         return ret;
 306 }
 307
 308 /* get a sane timeout for poll() */
 309 #define BUFUNIT_TIMEOUT_MS(devc)        (100 + ((devc->bufunitsize * 1000) / \
 310                                 (uint32_t)(devc->cur_samplerate)))
 311
 312 static int dev_acquisition_start(const struct sr_dev_inst *sdi)
 313 {
 314         struct dev_context *devc = sdi->priv;
 315         struct sr_trigger *trigger;
 316
 317         if (sdi->status != SR_ST_ACTIVE)
 318                 return SR_ERR_DEV_CLOSED;
 319
 320         /* Clear capture state */
 321         devc->bytes_read = 0;
 322         devc->offset = 0;
 323
 324         /* Configure channels */
 325         devc->sampleunit = g_slist_length(sdi->channels) > 8 ?
 326                         BL_SAMPLEUNIT_16_BITS : BL_SAMPLEUNIT_8_BITS;
 327         beaglelogic_set_sampleunit(devc);
 328
 329         /* Configure triggers & send header packet */
 330         if ((trigger = sr_session_trigger_get(sdi->session))) {
 331                 int pre_trigger_samples = 0;
 332                 if (devc->limit_samples > 0)
 333                         pre_trigger_samples = devc->capture_ratio * devc->limit_samples/100;
 334                 devc->stl = soft_trigger_logic_new(sdi, trigger, pre_trigger_samples);
 335                 if (!devc->stl)
 336                         return SR_ERR_MALLOC;
 337                 devc->trigger_fired = FALSE;
 338         } else
 339                 devc->trigger_fired = TRUE;
 340         std_session_send_df_header(sdi, LOG_PREFIX);
 341
 342         /* Trigger and add poll on file */
 343         beaglelogic_start(devc);
 344         sr_session_source_add_pollfd(sdi->session, &devc->pollfd,
 345                         BUFUNIT_TIMEOUT_MS(devc), beaglelogic_receive_data,
 346                         (void *)sdi);
 347
 348         return SR_OK;
 349 }
 350
 351 static int dev_acquisition_stop(struct sr_dev_inst *sdi)
 352 {
 353         struct dev_context *devc = sdi->priv;
 354
 355         if (sdi->status != SR_ST_ACTIVE)
 356                 return SR_ERR_DEV_CLOSED;
 357
 358         /* Execute a stop on BeagleLogic */
 359         beaglelogic_stop(devc);
 360
 361         /* lseek to offset 0, flushes the cache */
 362         lseek(devc->fd, 0, SEEK_SET);
 363
 364         /* Remove session source and send EOT packet */
 365         sr_session_source_remove_pollfd(sdi->session, &devc->pollfd);
 366         std_session_send_df_end(sdi, LOG_PREFIX);
 367
 368         return SR_OK;
 369 }
 370
 371 SR_PRIV struct sr_dev_driver beaglelogic_driver_info = {
 372         .name = "beaglelogic",
 373         .longname = "BeagleLogic",
 374         .api_version = 1,
 375         .init = init,
 376         .cleanup = std_cleanup,
 377         .scan = scan,
 378         .dev_list = dev_list,
 379         .config_get = config_get,
 380         .config_set = config_set,
 381         .config_list = config_list,
 382         .dev_open = dev_open,
 383         .dev_close = dev_close,
 384         .dev_acquisition_start = dev_acquisition_start,
 385         .dev_acquisition_stop = dev_acquisition_stop,
 386         .context = NULL,
 387 };