src/hardware/baylibre-acme/api.c

   1 /*
   2  * This file is part of the libsigrok project.
   3  *
   4  * Copyright (C) 2015 Bartosz Golaszewski <bgolaszewski@baylibre.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 "protocol.h"
  22 #include <time.h>
  23 #include <sys/timerfd.h>
  24
  25 static const uint32_t drvopts[] = {
  26         SR_CONF_THERMOMETER,
  27         SR_CONF_POWERMETER,
  28 };
  29
  30 static const uint32_t devopts[] = {
  31         SR_CONF_CONTINUOUS,
  32         SR_CONF_LIMIT_SAMPLES | SR_CONF_GET | SR_CONF_SET,
  33         SR_CONF_LIMIT_MSEC | SR_CONF_GET | SR_CONF_SET,
  34         SR_CONF_SAMPLERATE | SR_CONF_GET | SR_CONF_SET | SR_CONF_LIST,
  35 };
  36
  37 /*
  38  * Currently there are two channel-group/probe options for ACME:
  39  *   - SR_CONF_PROBE_FACTOR - allows to modify current shunt resistance
  40  *     calibration
  41  *   - SR_CONF_POWER_OFF - allows to remotely cut-off/restore power to
  42  *     measured devices
  43  *
  44  * They are not static - we have to check each probe's capabilities in
  45  * config_list().
  46  */
  47 #define MAX_DEVOPTS_CG          2
  48 #define HAS_PROBE_FACTOR        (SR_CONF_PROBE_FACTOR | SR_CONF_GET | SR_CONF_SET)
  49 #define HAS_POWER_OFF           (SR_CONF_POWER_OFF | SR_CONF_GET | SR_CONF_SET)
  50
  51 #define MAX_SAMPLE_RATE 500 /* In Hz */
  52
  53 static const uint64_t samplerates[] = {
  54         SR_HZ(1),
  55         SR_HZ(MAX_SAMPLE_RATE),
  56         SR_HZ(1),
  57 };
  58
  59 static GSList *scan(struct sr_dev_driver *di, GSList *options)
  60 {
  61         struct dev_context *devc;
  62         struct sr_dev_inst *sdi;
  63         gboolean status;
  64         int i;
  65
  66         (void)options;
  67
  68         devc = g_malloc0(sizeof(struct dev_context));
  69         devc->samplerate = SR_HZ(10);
  70
  71         sdi = g_malloc0(sizeof(struct sr_dev_inst));
  72         sdi->status = SR_ST_INACTIVE;
  73         sdi->vendor = g_strdup("BayLibre");
  74         sdi->model = g_strdup("ACME");
  75         sdi->priv = devc;
  76
  77         status = bl_acme_is_sane();
  78         if (!status)
  79                 goto err_out;
  80
  81         /*
  82          * Iterate over all ACME connectors and check if any probes
  83          * are present.
  84          */
  85         for (i = 0; i < MAX_PROBES; i++) {
  86                 /*
  87                  * First check if there's an energy probe on this connector. If
  88                  * not, and we're already at the fifth probe - see if we can
  89                  * detect a temperature probe.
  90                  */
  91                 status = bl_acme_detect_probe(bl_acme_get_enrg_addr(i),
  92                                               PROBE_NUM(i), ENRG_PROBE_NAME);
  93                 if (status) {
  94                         /* Energy probe detected. */
  95                         status = bl_acme_register_probe(sdi, PROBE_ENRG,
  96                                         bl_acme_get_enrg_addr(i), PROBE_NUM(i));
  97                         if (!status) {
  98                                 sr_err("Error registering power probe %d",
  99                                        PROBE_NUM(i));
 100                                 continue;
 101                         }
 102                 } else if (i >= TEMP_PRB_START_INDEX) {
 103                         status = bl_acme_detect_probe(bl_acme_get_temp_addr(i),
 104                                               PROBE_NUM(i), TEMP_PROBE_NAME);
 105                         if (status) {
 106                                 /* Temperature probe detected. */
 107                                 status = bl_acme_register_probe(sdi,PROBE_TEMP,
 108                                         bl_acme_get_temp_addr(i), PROBE_NUM(i));
 109                                 if (!status) {
 110                                         sr_err("Error registering temp "
 111                                                "probe %d", PROBE_NUM(i));
 112                                         continue;
 113                                 }
 114                         }
 115                 }
 116         }
 117
 118         /*
 119          * Let's assume there's no ACME device present if no probe
 120          * has been registered.
 121          */
 122         if (!sdi->channel_groups)
 123                 goto err_out;
 124
 125         return std_scan_complete(di, g_slist_append(NULL, sdi));
 126
 127 err_out:
 128         g_free(devc);
 129         sr_dev_inst_free(sdi);
 130
 131         return NULL;
 132 }
 133
 134 static int config_get(uint32_t key, GVariant **data,
 135         const struct sr_dev_inst *sdi, const struct sr_channel_group *cg)
 136 {
 137         struct dev_context *devc;
 138         int ret;
 139         uint64_t shunt;
 140         gboolean power_off;
 141
 142         devc = sdi->priv;
 143
 144         ret = SR_OK;
 145
 146         switch (key) {
 147         case SR_CONF_LIMIT_SAMPLES:
 148         case SR_CONF_LIMIT_MSEC:
 149                 return sr_sw_limits_config_get(&devc->limits, key, data);
 150         case SR_CONF_SAMPLERATE:
 151                 *data = g_variant_new_uint64(devc->samplerate);
 152                 break;
 153         case SR_CONF_PROBE_FACTOR:
 154                 if (!cg)
 155                         return SR_ERR_CHANNEL_GROUP;
 156                 ret = bl_acme_get_shunt(cg, &shunt);
 157                 if (ret == SR_OK)
 158                         *data = g_variant_new_uint64(shunt);
 159                 break;
 160         case SR_CONF_POWER_OFF:
 161                 if (!cg)
 162                         return SR_ERR_CHANNEL_GROUP;
 163                 ret = bl_acme_read_power_state(cg, &power_off);
 164                 if (ret == SR_OK)
 165                         *data = g_variant_new_boolean(power_off);
 166                 break;
 167         default:
 168                 return SR_ERR_NA;
 169         }
 170
 171         return ret;
 172 }
 173
 174 static int config_set(uint32_t key, GVariant *data,
 175         const struct sr_dev_inst *sdi, const struct sr_channel_group *cg)
 176 {
 177         struct dev_context *devc;
 178         uint64_t samplerate;
 179
 180         devc = sdi->priv;
 181
 182         switch (key) {
 183         case SR_CONF_LIMIT_SAMPLES:
 184         case SR_CONF_LIMIT_MSEC:
 185                 return sr_sw_limits_config_set(&devc->limits, key, data);
 186         case SR_CONF_SAMPLERATE:
 187                 samplerate = g_variant_get_uint64(data);
 188                 if (samplerate > MAX_SAMPLE_RATE) {
 189                         sr_err("Maximum sample rate is %d", MAX_SAMPLE_RATE);
 190                         return SR_ERR_SAMPLERATE;
 191                 }
 192                 devc->samplerate = samplerate;
 193                 bl_acme_maybe_set_update_interval(sdi, samplerate);
 194                 break;
 195         case SR_CONF_PROBE_FACTOR:
 196                 if (!cg)
 197                         return SR_ERR_CHANNEL_GROUP;
 198                 return bl_acme_set_shunt(cg, g_variant_get_uint64(data));
 199         case SR_CONF_POWER_OFF:
 200                 if (!cg)
 201                         return SR_ERR_CHANNEL_GROUP;
 202                 return bl_acme_set_power_off(cg, g_variant_get_boolean(data));
 203         default:
 204                 return SR_ERR_NA;
 205         }
 206
 207         return SR_OK;
 208 }
 209
 210 static int config_list(uint32_t key, GVariant **data,
 211         const struct sr_dev_inst *sdi, const struct sr_channel_group *cg)
 212 {
 213         uint32_t devopts_cg[MAX_DEVOPTS_CG];
 214         int num_devopts_cg = 0;
 215
 216         if (!cg) {
 217                 switch (key) {
 218                 case SR_CONF_DEVICE_OPTIONS:
 219                         return STD_CONFIG_LIST(key, data, sdi, cg, NULL, drvopts, devopts);
 220                 case SR_CONF_SAMPLERATE:
 221                         *data = std_gvar_samplerates_steps(ARRAY_AND_SIZE(samplerates));
 222                         break;
 223                 default:
 224                         return SR_ERR_NA;
 225                 }
 226         } else {
 227                 switch (key) {
 228                 case SR_CONF_DEVICE_OPTIONS:
 229                         if (bl_acme_get_probe_type(cg) == PROBE_ENRG)
 230                                 devopts_cg[num_devopts_cg++] = HAS_PROBE_FACTOR;
 231                         if (bl_acme_probe_has_pws(cg))
 232                                 devopts_cg[num_devopts_cg++] = HAS_POWER_OFF;
 233
 234                         *data = std_gvar_array_u32(devopts_cg, num_devopts_cg);
 235                         break;
 236                 default:
 237                         return SR_ERR_NA;
 238                 }
 239         }
 240
 241         return SR_OK;
 242 }
 243
 244 static void dev_acquisition_close(const struct sr_dev_inst *sdi)
 245 {
 246         GSList *chl;
 247         struct sr_channel *ch;
 248
 249         for (chl = sdi->channels; chl; chl = chl->next) {
 250                 ch = chl->data;
 251                 bl_acme_close_channel(ch);
 252         }
 253 }
 254
 255 static int dev_acquisition_open(const struct sr_dev_inst *sdi)
 256 {
 257         GSList *chl;
 258         struct sr_channel *ch;
 259
 260         for (chl = sdi->channels; chl; chl = chl->next) {
 261                 ch = chl->data;
 262                 if (bl_acme_open_channel(ch)) {
 263                         sr_err("Error opening channel %s", ch->name);
 264                         dev_acquisition_close(sdi);
 265                         return SR_ERR;
 266                 }
 267         }
 268
 269         return 0;
 270 }
 271
 272 static int dev_acquisition_start(const struct sr_dev_inst *sdi)
 273 {
 274         struct dev_context *devc;
 275         struct itimerspec tspec = {
 276                 .it_interval = { 0, 0 },
 277                 .it_value = { 0, 0 }
 278         };
 279
 280         if (dev_acquisition_open(sdi))
 281                 return SR_ERR;
 282
 283         devc = sdi->priv;
 284         devc->samples_missed = 0;
 285         devc->timer_fd = timerfd_create(CLOCK_MONOTONIC, 0);
 286         if (devc->timer_fd < 0) {
 287                 sr_err("Error creating timer fd");
 288                 return SR_ERR;
 289         }
 290
 291         tspec.it_interval.tv_sec = 0;
 292         tspec.it_interval.tv_nsec = SR_HZ_TO_NS(devc->samplerate);
 293         tspec.it_value = tspec.it_interval;
 294
 295         if (timerfd_settime(devc->timer_fd, 0, &tspec, NULL)) {
 296                 sr_err("Failed to set timer");
 297                 close(devc->timer_fd);
 298                 return SR_ERR;
 299         }
 300
 301         devc->channel = g_io_channel_unix_new(devc->timer_fd);
 302         g_io_channel_set_flags(devc->channel, G_IO_FLAG_NONBLOCK, NULL);
 303         g_io_channel_set_encoding(devc->channel, NULL, NULL);
 304         g_io_channel_set_buffered(devc->channel, FALSE);
 305
 306         sr_session_source_add_channel(sdi->session, devc->channel,
 307                 G_IO_IN | G_IO_ERR, 1000, bl_acme_receive_data, (void *)sdi);
 308
 309         std_session_send_df_header(sdi);
 310         sr_sw_limits_acquisition_start(&devc->limits);
 311
 312         return SR_OK;
 313 }
 314
 315 static int dev_acquisition_stop(struct sr_dev_inst *sdi)
 316 {
 317         struct dev_context *devc;
 318
 319         devc = sdi->priv;
 320
 321         dev_acquisition_close(sdi);
 322         sr_session_source_remove_channel(sdi->session, devc->channel);
 323         g_io_channel_shutdown(devc->channel, FALSE, NULL);
 324         g_io_channel_unref(devc->channel);
 325         devc->channel = NULL;
 326
 327         std_session_send_df_end(sdi);
 328
 329         if (devc->samples_missed > 0)
 330                 sr_warn("%" PRIu64 " samples missed", devc->samples_missed);
 331
 332         return SR_OK;
 333 }
 334
 335 static struct sr_dev_driver baylibre_acme_driver_info = {
 336         .name = "baylibre-acme",
 337         .longname = "BayLibre ACME (Another Cute Measurement Equipment)",
 338         .api_version = 1,
 339         .init = std_init,
 340         .cleanup = std_cleanup,
 341         .scan = scan,
 342         .dev_list = std_dev_list,
 343         .dev_clear = std_dev_clear,
 344         .config_get = config_get,
 345         .config_set = config_set,
 346         .config_list = config_list,
 347         .dev_open = std_dummy_dev_open,
 348         .dev_close = std_dummy_dev_close,
 349         .dev_acquisition_start = dev_acquisition_start,
 350         .dev_acquisition_stop = dev_acquisition_stop,
 351         .context = NULL,
 352 };
 353 SR_REGISTER_DEV_DRIVER(baylibre_acme_driver_info);