session_driver.c

   1 /*
   2  * This file is part of the libsigrok project.
   3  *
   4  * Copyright (C) 2013 Bert Vermeulen <bert@biot.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 <sys/types.h>
  21 #include <sys/stat.h>
  22 #include <fcntl.h>
  23 #include <unistd.h>
  24 #include <sys/time.h>
  25 #include <zip.h>
  26 #include "libsigrok.h"
  27 #include "libsigrok-internal.h"
  28
  29 /* Message logging helpers with driver-specific prefix string. */
  30 #define DRIVER_LOG_DOMAIN "virtual-session: "
  31 #define sr_log(l, s, args...) sr_log(l, DRIVER_LOG_DOMAIN s, ## args)
  32 #define sr_spew(s, args...) sr_spew(DRIVER_LOG_DOMAIN s, ## args)
  33 #define sr_dbg(s, args...) sr_dbg(DRIVER_LOG_DOMAIN s, ## args)
  34 #define sr_info(s, args...) sr_info(DRIVER_LOG_DOMAIN s, ## args)
  35 #define sr_warn(s, args...) sr_warn(DRIVER_LOG_DOMAIN s, ## args)
  36 #define sr_err(s, args...) sr_err(DRIVER_LOG_DOMAIN s, ## args)
  37
  38 /* size of payloads sent across the session bus */
  39 /** @cond PRIVATE */
  40 #define CHUNKSIZE (512 * 1024)
  41 /** @endcond */
  42
  43 struct session_vdev {
  44         char *sessionfile;
  45         char *capturefile;
  46         struct zip *archive;
  47         struct zip_file *capfile;
  48         int bytes_read;
  49         uint64_t samplerate;
  50         int unitsize;
  51         int num_probes;
  52 };
  53
  54 static GSList *dev_insts = NULL;
  55 static const int hwcaps[] = {
  56         SR_CONF_CAPTUREFILE,
  57         SR_CONF_CAPTURE_UNITSIZE,
  58         0,
  59 };
  60
  61 static int receive_data(int fd, int revents, void *cb_data)
  62 {
  63         struct sr_dev_inst *sdi;
  64         struct session_vdev *vdev;
  65         struct sr_datafeed_packet packet;
  66         struct sr_datafeed_logic logic;
  67         GSList *l;
  68         void *buf;
  69         int ret, got_data;
  70
  71         (void)fd;
  72         (void)revents;
  73
  74         sr_dbg("Feed chunk.");
  75
  76         got_data = FALSE;
  77         for (l = dev_insts; l; l = l->next) {
  78                 sdi = l->data;
  79                 vdev = sdi->priv;
  80                 if (!vdev)
  81                         /* already done with this instance */
  82                         continue;
  83
  84                 if (!(buf = g_try_malloc(CHUNKSIZE))) {
  85                         sr_err("%s: buf malloc failed", __func__);
  86                         return FALSE;
  87                 }
  88
  89                 ret = zip_fread(vdev->capfile, buf, CHUNKSIZE);
  90                 if (ret > 0) {
  91                         got_data = TRUE;
  92                         packet.type = SR_DF_LOGIC;
  93                         packet.payload = &logic;
  94                         logic.length = ret;
  95                         logic.unitsize = vdev->unitsize;
  96                         logic.data = buf;
  97                         vdev->bytes_read += ret;
  98                         sr_session_send(cb_data, &packet);
  99                 } else {
 100                         /* done with this capture file */
 101                         zip_fclose(vdev->capfile);
 102                         g_free(vdev->capturefile);
 103                         g_free(vdev);
 104                         sdi->priv = NULL;
 105                 }
 106         }
 107
 108         if (!got_data) {
 109                 packet.type = SR_DF_END;
 110                 sr_session_send(cb_data, &packet);
 111                 sr_session_source_remove(-1);
 112         }
 113
 114         return TRUE;
 115 }
 116
 117 /* driver callbacks */
 118 static int hw_cleanup(void);
 119
 120 static int hw_init(struct sr_context *sr_ctx)
 121 {
 122         (void)sr_ctx;
 123
 124         return SR_OK;
 125 }
 126
 127 static int hw_cleanup(void)
 128 {
 129         GSList *l;
 130
 131         for (l = dev_insts; l; l = l->next)
 132                 sr_dev_inst_free(l->data);
 133         g_slist_free(dev_insts);
 134         dev_insts = NULL;
 135
 136         return SR_OK;
 137 }
 138
 139 static int hw_dev_open(struct sr_dev_inst *sdi)
 140 {
 141         if (!(sdi->priv = g_try_malloc0(sizeof(struct session_vdev)))) {
 142                 sr_err("%s: sdi->priv malloc failed", __func__);
 143                 return SR_ERR_MALLOC;
 144         }
 145
 146         dev_insts = g_slist_append(dev_insts, sdi);
 147
 148         return SR_OK;
 149 }
 150
 151 static int config_get(int id, GVariant **data, const struct sr_dev_inst *sdi)
 152 {
 153         struct session_vdev *vdev;
 154
 155         switch (id) {
 156         case SR_CONF_SAMPLERATE:
 157                 if (sdi) {
 158                         vdev = sdi->priv;
 159                         *data = g_variant_new_uint64(vdev->samplerate);
 160                 } else
 161                         return SR_ERR;
 162                 break;
 163         default:
 164                 return SR_ERR_ARG;
 165         }
 166
 167         return SR_OK;
 168 }
 169
 170 static int config_set(int id, GVariant *data, const struct sr_dev_inst *sdi)
 171 {
 172         struct session_vdev *vdev;
 173
 174         vdev = sdi->priv;
 175
 176         switch (id) {
 177         case SR_CONF_SAMPLERATE:
 178                 vdev->samplerate = g_variant_get_uint64(data);
 179                 sr_info("Setting samplerate to %" PRIu64 ".", vdev->samplerate);
 180                 break;
 181         case SR_CONF_SESSIONFILE:
 182                 vdev->sessionfile = g_strdup(g_variant_get_string(data, NULL));
 183                 sr_info("Setting sessionfile to '%s'.", vdev->sessionfile);
 184                 break;
 185         case SR_CONF_CAPTUREFILE:
 186                 vdev->capturefile = g_strdup(g_variant_get_string(data, NULL));
 187                 sr_info("Setting capturefile to '%s'.", vdev->capturefile);
 188                 break;
 189         case SR_CONF_CAPTURE_UNITSIZE:
 190                 vdev->unitsize = g_variant_get_uint64(data);
 191                 break;
 192         case SR_CONF_CAPTURE_NUM_PROBES:
 193                 vdev->num_probes = g_variant_get_uint64(data);
 194                 break;
 195         default:
 196                 sr_err("Unknown capability: %d.", id);
 197                 return SR_ERR;
 198         }
 199
 200         return SR_OK;
 201 }
 202
 203 static int config_list(int key, GVariant **data, const struct sr_dev_inst *sdi)
 204 {
 205
 206         (void)sdi;
 207
 208         switch (key) {
 209         case SR_CONF_DEVICE_OPTIONS:
 210                 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_INT32,
 211                                 hwcaps, ARRAY_SIZE(hwcaps), sizeof(int32_t));
 212                 break;
 213         default:
 214                 return SR_ERR_ARG;
 215         }
 216
 217         return SR_OK;
 218 }
 219
 220 static int hw_dev_acquisition_start(const struct sr_dev_inst *sdi,
 221                 void *cb_data)
 222 {
 223         struct zip_stat zs;
 224         struct session_vdev *vdev;
 225         int ret;
 226
 227         vdev = sdi->priv;
 228
 229         sr_info("Opening archive %s file %s", vdev->sessionfile,
 230                 vdev->capturefile);
 231
 232         if (!(vdev->archive = zip_open(vdev->sessionfile, 0, &ret))) {
 233                 sr_err("Failed to open session file '%s': "
 234                        "zip error %d\n", vdev->sessionfile, ret);
 235                 return SR_ERR;
 236         }
 237
 238         if (zip_stat(vdev->archive, vdev->capturefile, 0, &zs) == -1) {
 239                 sr_err("Failed to check capture file '%s' in "
 240                        "session file '%s'.", vdev->capturefile, vdev->sessionfile);
 241                 return SR_ERR;
 242         }
 243
 244         if (!(vdev->capfile = zip_fopen(vdev->archive, vdev->capturefile, 0))) {
 245                 sr_err("Failed to open capture file '%s' in "
 246                        "session file '%s'.", vdev->capturefile, vdev->sessionfile);
 247                 return SR_ERR;
 248         }
 249
 250         /* Send header packet to the session bus. */
 251         std_session_send_df_header(cb_data, DRIVER_LOG_DOMAIN);
 252
 253         /* freewheeling source */
 254         sr_session_source_add(-1, 0, 0, receive_data, cb_data);
 255
 256         return SR_OK;
 257 }
 258
 259 /** @private */
 260 SR_PRIV struct sr_dev_driver session_driver = {
 261         .name = "virtual-session",
 262         .longname = "Session-emulating driver",
 263         .api_version = 1,
 264         .init = hw_init,
 265         .cleanup = hw_cleanup,
 266         .config_get = config_get,
 267         .config_set = config_set,
 268         .config_list = config_list,
 269         .dev_open = hw_dev_open,
 270         .dev_close = NULL,
 271         .dev_acquisition_start = hw_dev_acquisition_start,
 272         .dev_acquisition_stop = NULL,
 273 };