hardware/uni-t-dmm/api.c

   1 /*
   2  * This file is part of the sigrok project.
   3  *
   4  * Copyright (C) 2012 Uwe Hermann <uwe@hermann-uwe.de>
   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 2 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, write to the Free Software
  18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
  19  */
  20
  21 #include <stdlib.h>
  22 #include <string.h>
  23 #include "libsigrok.h"
  24 #include "libsigrok-internal.h"
  25 #include "protocol.h"
  26
  27 static const int hwcaps[] = {
  28         SR_HWCAP_MULTIMETER,
  29         SR_HWCAP_LIMIT_SAMPLES,
  30         SR_HWCAP_LIMIT_MSEC,
  31         SR_HWCAP_CONTINUOUS,
  32         0,
  33 };
  34
  35 SR_PRIV struct sr_dev_driver uni_t_ut61d_driver_info;
  36 SR_PRIV struct sr_dev_driver voltcraft_vc820_driver_info;
  37
  38 static struct sr_dev_driver *di_ut61d = &uni_t_ut61d_driver_info;
  39 static struct sr_dev_driver *di_vc820 = &voltcraft_vc820_driver_info;
  40
  41 /* After hw_init() this will point to a device-specific entry (see above). */
  42 static struct sr_dev_driver *di = NULL;
  43
  44 static int clear_instances(void)
  45 {
  46         /* TODO: Use common code later. */
  47
  48         return SR_OK;
  49 }
  50
  51 static int hw_init(struct sr_context *sr_ctx, int dmm)
  52 {
  53         struct drv_context *drvc;
  54
  55         if (!(drvc = g_try_malloc0(sizeof(struct drv_context)))) {
  56                 sr_err("Driver context malloc failed.");
  57                 return SR_ERR_MALLOC;
  58         }
  59
  60         if (dmm == UNI_T_UT61D)
  61                 di = di_ut61d;
  62         else if (dmm == VOLTCRAFT_VC820)
  63                 di = di_vc820;
  64         sr_dbg("Selected '%s' subdriver.", di->name);
  65
  66         drvc->sr_ctx = sr_ctx;
  67         di->priv = drvc;
  68
  69         return SR_OK;
  70 }
  71
  72 static int hw_init_ut61d(struct sr_context *sr_ctx)
  73 {
  74         return hw_init(sr_ctx, UNI_T_UT61D);
  75 }
  76
  77 static int hw_init_vc820(struct sr_context *sr_ctx)
  78 {
  79         return hw_init(sr_ctx, VOLTCRAFT_VC820);
  80 }
  81
  82 static GSList *hw_scan(GSList *options)
  83 {
  84         GSList *devices, *l;
  85         struct sr_dev_inst *sdi;
  86         struct dev_context *devc;
  87         struct drv_context *drvc;
  88         struct sr_probe *probe;
  89         struct libusb_device *ldev;
  90         int i, devcnt;
  91
  92         (void)options;
  93
  94         drvc = di->priv;
  95
  96         devices = NULL;
  97
  98         if (!(l = sr_usb_find(drvc->sr_ctx->libusb_ctx, "1a86.e008")))
  99                 return NULL;
 100
 101         for (i = 0; i < (int)g_slist_length(l); i++) {
 102                 ldev = (struct libusb_device *)l->data;
 103
 104                 if (!(devc = g_try_malloc0(sizeof(struct dev_context)))) {
 105                         sr_err("Device context malloc failed.");
 106                         return NULL;
 107                 }
 108
 109                 devcnt = g_slist_length(drvc->instances);
 110                 if (!(sdi = sr_dev_inst_new(devcnt, SR_ST_INACTIVE,
 111                                 di->longname, NULL, NULL))) {
 112                         sr_err("sr_dev_inst_new returned NULL.");
 113                         return NULL;
 114                 }
 115                 sdi->priv = devc;
 116                 sdi->driver = di;
 117                 if (!(probe = sr_probe_new(0, SR_PROBE_ANALOG, TRUE, "P1")))
 118                         return NULL;
 119                 sdi->probes = g_slist_append(sdi->probes, probe);
 120                 devc->usb = sr_usb_dev_inst_new(
 121                                 libusb_get_bus_number(ldev),
 122                                 libusb_get_device_address(ldev), NULL);
 123                 drvc->instances = g_slist_append(drvc->instances, l->data);
 124                 devices = g_slist_append(devices, sdi);
 125         }
 126
 127         return devices;
 128 }
 129
 130 static GSList *hw_dev_list(void)
 131 {
 132         struct drv_context *drvc;
 133
 134         drvc = di->priv;
 135
 136         return drvc->instances;
 137 }
 138
 139 static int hw_dev_open(struct sr_dev_inst *sdi)
 140 {
 141         struct dev_context *devc;
 142
 143         devc = sdi->priv;
 144
 145         return sr_usb_open(NULL, devc->usb);
 146 }
 147
 148 static int hw_dev_close(struct sr_dev_inst *sdi)
 149 {
 150         (void)sdi;
 151
 152         /* TODO */
 153
 154         return SR_OK;
 155 }
 156
 157 static int hw_cleanup(void)
 158 {
 159         clear_instances();
 160
 161         return SR_OK;
 162 }
 163
 164 static int hw_info_get(int info_id, const void **data,
 165                        const struct sr_dev_inst *sdi)
 166 {
 167         (void)sdi;
 168
 169         sr_spew("Backend requested info_id %d.", info_id);
 170
 171         switch (info_id) {
 172         case SR_DI_HWCAPS:
 173                 *data = hwcaps;
 174                 sr_spew("%s: Returning hwcaps.", __func__);
 175                 break;
 176         case SR_DI_SAMPLERATES:
 177                 /* TODO: Get rid of this. */
 178                 *data = NULL;
 179                 sr_spew("%s: Returning samplerates.", __func__);
 180                 return SR_ERR_ARG;
 181                 break;
 182         case SR_DI_CUR_SAMPLERATE:
 183                 /* TODO: Get rid of this. */
 184                 *data = NULL;
 185                 sr_spew("%s: Returning current samplerate.", __func__);
 186                 return SR_ERR_ARG;
 187                 break;
 188         default:
 189                 return SR_ERR_ARG;
 190                 break;
 191         }
 192
 193         return SR_OK;
 194 }
 195
 196 static int hw_dev_config_set(const struct sr_dev_inst *sdi, int hwcap,
 197                              const void *value)
 198 {
 199         struct dev_context *devc;
 200
 201         devc = sdi->priv;
 202
 203         switch (hwcap) {
 204         case SR_HWCAP_LIMIT_MSEC:
 205                 /* TODO: Not yet implemented. */
 206                 if (*(const uint64_t *)value == 0) {
 207                         sr_err("Time limit cannot be 0.");
 208                         return SR_ERR;
 209                 }
 210                 devc->limit_msec = *(const uint64_t *)value;
 211                 sr_dbg("Setting time limit to %" PRIu64 "ms.",
 212                        devc->limit_msec);
 213                 break;
 214         case SR_HWCAP_LIMIT_SAMPLES:
 215                 if (*(const uint64_t *)value == 0) {
 216                         sr_err("Sample limit cannot be 0.");
 217                         return SR_ERR;
 218                 }
 219                 devc->limit_samples = *(const uint64_t *)value;
 220                 sr_dbg("Setting sample limit to %" PRIu64 ".",
 221                        devc->limit_samples);
 222                 break;
 223         default:
 224                 sr_err("Unknown capability: %d.", hwcap);
 225                 return SR_ERR;
 226                 break;
 227         }
 228
 229         return SR_OK;
 230 }
 231
 232 static int hw_dev_acquisition_start(const struct sr_dev_inst *sdi,
 233                                     void *cb_data)
 234 {
 235         struct sr_datafeed_packet packet;
 236         struct sr_datafeed_header header;
 237         struct sr_datafeed_meta_analog meta;
 238         struct dev_context *devc;
 239
 240         devc = sdi->priv;
 241
 242         sr_dbg("Starting acquisition.");
 243
 244         devc->cb_data = cb_data;
 245
 246         /* Send header packet to the session bus. */
 247         sr_dbg("Sending SR_DF_HEADER.");
 248         packet.type = SR_DF_HEADER;
 249         packet.payload = (uint8_t *)&header;
 250         header.feed_version = 1;
 251         gettimeofday(&header.starttime, NULL);
 252         sr_session_send(devc->cb_data, &packet);
 253
 254         /* Send metadata about the SR_DF_ANALOG packets to come. */
 255         sr_dbg("Sending SR_DF_META_ANALOG.");
 256         packet.type = SR_DF_META_ANALOG;
 257         packet.payload = &meta;
 258         meta.num_probes = 1;
 259         sr_session_send(devc->cb_data, &packet);
 260
 261         if (!strcmp(di->name, "uni-t-ut61d")) {
 262                 sr_source_add(0, 0, 10 /* poll_timeout */,
 263                               uni_t_ut61d_receive_data, (void *)sdi);
 264         } else if (!strcmp(di->name, "voltcraft-vc820")) {
 265                 sr_source_add(0, 0, 10 /* poll_timeout */,
 266                               voltcraft_vc820_receive_data, (void *)sdi);
 267         }
 268
 269         return SR_OK;
 270 }
 271
 272 static int hw_dev_acquisition_stop(struct sr_dev_inst *sdi, void *cb_data)
 273 {
 274         struct sr_datafeed_packet packet;
 275
 276         (void)sdi;
 277
 278         sr_dbg("Stopping acquisition.");
 279
 280         /* Send end packet to the session bus. */
 281         sr_dbg("Sending SR_DF_END.");
 282         packet.type = SR_DF_END;
 283         sr_session_send(cb_data, &packet);
 284
 285         /* TODO? */
 286         sr_source_remove(0);
 287
 288         return SR_OK;
 289 }
 290
 291 SR_PRIV struct sr_dev_driver uni_t_ut61d_driver_info = {
 292         .name = "uni-t-ut61d",
 293         .longname = "UNI-T UT61D",
 294         .api_version = 1,
 295         .init = hw_init_ut61d,
 296         .cleanup = hw_cleanup,
 297         .scan = hw_scan,
 298         .dev_list = hw_dev_list,
 299         .dev_clear = clear_instances,
 300         .dev_open = hw_dev_open,
 301         .dev_close = hw_dev_close,
 302         .info_get = hw_info_get,
 303         .dev_config_set = hw_dev_config_set,
 304         .dev_acquisition_start = hw_dev_acquisition_start,
 305         .dev_acquisition_stop = hw_dev_acquisition_stop,
 306         .priv = NULL,
 307 };
 308
 309 SR_PRIV struct sr_dev_driver voltcraft_vc820_driver_info = {
 310         .name = "voltcraft-vc820",
 311         .longname = "Voltcraft VC-820",
 312         .api_version = 1,
 313         .init = hw_init_vc820,
 314         .cleanup = hw_cleanup,
 315         .scan = hw_scan,
 316         .dev_list = hw_dev_list,
 317         .dev_clear = clear_instances,
 318         .dev_open = hw_dev_open,
 319         .dev_close = hw_dev_close,
 320         .info_get = hw_info_get,
 321         .dev_config_set = hw_dev_config_set,
 322         .dev_acquisition_start = hw_dev_acquisition_start,
 323         .dev_acquisition_stop = hw_dev_acquisition_stop,
 324         .priv = NULL,
 325 };