]> sigrok.org Git - libsigrok.git/blob - session_driver.c
sr/cli/gtk/qt: s/get_dev_info/dev_info_get/.
[libsigrok.git] / session_driver.c
1 /*
2  * This file is part of the sigrok project.
3  *
4  * Copyright (C) 2010-2012 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 "sigrok.h"
27 #include "sigrok-internal.h"
28
29 /* size of payloads sent across the session bus */
30 #define CHUNKSIZE (512 * 1024)
31
32 struct session_vdev {
33         char *capturefile;
34         struct zip *archive;
35         struct zip_file *capfile;
36         int bytes_read;
37         uint64_t samplerate;
38         int unitsize;
39         int num_probes;
40 };
41
42 static char *sessionfile = NULL;
43 static GSList *dev_insts = NULL;
44 static int hwcaps[] = {
45         SR_HWCAP_CAPTUREFILE,
46         SR_HWCAP_CAPTURE_UNITSIZE,
47         0,
48 };
49
50 /**
51  * TODO.
52  *
53  * @param dev_index TODO.
54  */
55 static struct session_vdev *get_vdev_by_index(int dev_index)
56 {
57         struct sr_dev_inst *sdi;
58         struct session_vdev *vdev;
59
60         /* TODO: Sanity checks on dev_index. */
61
62         if (!(sdi = sr_dev_inst_get(dev_insts, dev_index))) {
63                 sr_err("session driver: %s: device instance with device "
64                        "index %d was not found", __func__, dev_index);
65                 return NULL;
66         }
67
68         /* TODO: Is sdi->priv == NULL valid? */
69
70         vdev = sdi->priv;
71
72         return vdev;
73 }
74
75 /**
76  * TODO.
77  *
78  * @param fd TODO.
79  * @param revents TODO.
80  * @param session_data TODO.
81  *
82  * @return TODO.
83  */
84 static int feed_chunk(int fd, int revents, void *session_data)
85 {
86         struct sr_dev_inst *sdi;
87         struct session_vdev *vdev;
88         struct sr_datafeed_packet packet;
89         struct sr_datafeed_logic logic;
90         GSList *l;
91         void *buf;
92         int ret, got_data;
93
94         /* Avoid compiler warnings. */
95         (void)fd;
96         (void)revents;
97
98         sr_dbg("session_driver: feed chunk");
99
100         got_data = FALSE;
101         for (l = dev_insts; l; l = l->next) {
102                 sdi = l->data;
103                 vdev = sdi->priv;
104                 if (!vdev)
105                         /* already done with this instance */
106                         continue;
107
108                 if (!(buf = g_try_malloc(CHUNKSIZE))) {
109                         sr_err("session driver: %s: buf malloc failed",
110                                __func__);
111                         return FALSE; /* TODO: SR_ERR_MALLOC */
112                 }
113
114                 ret = zip_fread(vdev->capfile, buf, CHUNKSIZE);
115                 if (ret > 0) {
116                         got_data = TRUE;
117                         packet.type = SR_DF_LOGIC;
118                         packet.payload = &logic;
119                         logic.length = ret;
120                         logic.unitsize = vdev->unitsize;
121                         logic.data = buf;
122                         vdev->bytes_read += ret;
123                         sr_session_bus(session_data, &packet);
124                 } else {
125                         /* done with this capture file */
126                         zip_fclose(vdev->capfile);
127                         g_free(vdev->capturefile);
128                         g_free(vdev);
129                         sdi->priv = NULL;
130                 }
131         }
132
133         if (!got_data) {
134                 packet.type = SR_DF_END;
135                 sr_session_bus(session_data, &packet);
136         }
137
138         return TRUE;
139 }
140
141 /* driver callbacks */
142 static int hw_cleanup(void);
143
144 /**
145  * TODO.
146  *
147  * @param devinfo TODO.
148  *
149  * @return TODO.
150  */
151 static int hw_init(const char *devinfo)
152 {
153         sessionfile = g_strdup(devinfo);
154
155         return 0;
156 }
157
158 /**
159  * TODO.
160  *
161  */
162 static int hw_cleanup(void)
163 {
164         GSList *l;
165
166         for (l = dev_insts; l; l = l->next)
167                 sr_dev_inst_free(l->data);
168         g_slist_free(dev_insts);
169         dev_insts = NULL;
170
171         sr_session_source_remove(-1);
172
173         g_free(sessionfile);
174
175         return SR_OK;
176 }
177
178 static int hw_opendev(int dev_index)
179 {
180         struct sr_dev_inst *sdi;
181
182         sdi = sr_dev_inst_new(dev_index, SR_ST_INITIALIZING,
183                               NULL, NULL, NULL);
184         if (!sdi)
185                 return SR_ERR;
186
187         if (!(sdi->priv = g_try_malloc0(sizeof(struct session_vdev)))) {
188                 sr_err("session driver: %s: sdi->priv malloc failed", __func__);
189                 return SR_ERR_MALLOC;
190         }
191
192         dev_insts = g_slist_append(dev_insts, sdi);
193
194         return SR_OK;
195 }
196
197 static void *hw_dev_info_get(int dev_index, int dev_info_id)
198 {
199         struct session_vdev *vdev;
200         void *info;
201
202         if (dev_info_id != SR_DI_CUR_SAMPLERATE)
203                 return NULL;
204
205         if (!(vdev = get_vdev_by_index(dev_index)))
206                 return NULL;
207
208         info = &vdev->samplerate;
209
210         return info;
211 }
212
213 static int hw_get_status(int dev_index)
214 {
215         /* Avoid compiler warnings. */
216         (void)dev_index;
217
218         if (sr_dev_list() != NULL)
219                 return SR_OK;
220         else
221                 return SR_ERR;
222 }
223
224 /**
225  * Get the list of hardware capabilities.
226  *
227  * @return A pointer to the (hardware) capabilities of this virtual session
228  *         driver. This could be NULL, if no such capabilities exist.
229  */
230 static int *hw_hwcap_get_all(void)
231 {
232         return hwcaps;
233 }
234
235 static int hw_config_set(int dev_index, int hwcap, void *value)
236 {
237         struct session_vdev *vdev;
238         uint64_t *tmp_u64;
239
240         if (!(vdev = get_vdev_by_index(dev_index)))
241                 return SR_ERR;
242
243         switch (hwcap) {
244         case SR_HWCAP_SAMPLERATE:
245                 tmp_u64 = value;
246                 vdev->samplerate = *tmp_u64;
247                 sr_info("session driver: setting samplerate to %" PRIu64,
248                         vdev->samplerate);
249                 break;
250         case SR_HWCAP_CAPTUREFILE:
251                 vdev->capturefile = g_strdup(value);
252                 sr_info("session driver: setting capturefile to %s",
253                         vdev->capturefile);
254                 break;
255         case SR_HWCAP_CAPTURE_UNITSIZE:
256                 tmp_u64 = value;
257                 vdev->unitsize = *tmp_u64;
258                 break;
259         case SR_HWCAP_CAPTURE_NUM_PROBES:
260                 tmp_u64 = value;
261                 vdev->num_probes = *tmp_u64;
262                 break;
263         default:
264                 sr_err("session driver: %s: unknown capability %d requested",
265                        __func__, hwcap);
266                 return SR_ERR;
267         }
268
269         return SR_OK;
270 }
271
272 static int hw_start_acquisition(int dev_index, gpointer session_dev_id)
273 {
274         struct zip_stat zs;
275         struct session_vdev *vdev;
276         struct sr_datafeed_header *header;
277         struct sr_datafeed_packet *packet;
278         int err;
279
280         /* Avoid compiler warnings. */
281         (void)session_dev_id;
282
283         if (!(vdev = get_vdev_by_index(dev_index)))
284                 return SR_ERR;
285
286         sr_info("session_driver: opening archive %s file %s", sessionfile,
287                 vdev->capturefile);
288
289         if (!(vdev->archive = zip_open(sessionfile, 0, &err))) {
290                 sr_err("session driver: Failed to open session file '%s': "
291                        "zip error %d\n", sessionfile, err);
292                 return SR_ERR;
293         }
294
295         if (zip_stat(vdev->archive, vdev->capturefile, 0, &zs) == -1) {
296                 sr_err("session driver: Failed to check capture file '%s' in "
297                        "session file '%s'.", vdev->capturefile, sessionfile);
298                 return SR_ERR;
299         }
300
301         if (!(vdev->capfile = zip_fopen(vdev->archive, vdev->capturefile, 0))) {
302                 sr_err("session driver: Failed to open capture file '%s' in "
303                        "session file '%s'.", vdev->capturefile, sessionfile);
304                 return SR_ERR;
305         }
306
307         /* freewheeling source */
308         sr_session_source_add(-1, 0, 0, feed_chunk, session_dev_id);
309
310         if (!(packet = g_try_malloc(sizeof(struct sr_datafeed_packet)))) {
311                 sr_err("session driver: %s: packet malloc failed", __func__);
312                 return SR_ERR_MALLOC;
313         }
314
315         if (!(header = g_try_malloc(sizeof(struct sr_datafeed_header)))) {
316                 sr_err("session driver: %s: header malloc failed", __func__);
317                 return SR_ERR_MALLOC;
318         }
319
320         /* Send header packet to the session bus. */
321         packet->type = SR_DF_HEADER;
322         packet->payload = (unsigned char *)header;
323         header->feed_version = 1;
324         gettimeofday(&header->starttime, NULL);
325         header->samplerate = vdev->samplerate;
326         header->num_logic_probes = vdev->num_probes;
327         sr_session_bus(session_dev_id, packet);
328         g_free(header);
329         g_free(packet);
330
331         return SR_OK;
332 }
333
334 SR_PRIV struct sr_dev_plugin session_driver = {
335         .name = "session",
336         .longname = "Session-emulating driver",
337         .api_version = 1,
338         .init = hw_init,
339         .cleanup = hw_cleanup,
340         .opendev = hw_opendev,
341         .closedev = NULL,
342         .dev_info_get = hw_dev_info_get,
343         .get_status = hw_get_status,
344         .hwcap_get_all = hw_hwcap_get_all,
345         .config_set = hw_config_set,
346         .start_acquisition = hw_start_acquisition,
347         .stop_acquisition = NULL,
348 };