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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 subsystem-specific prefix string. */ | |
30 | #define LOG_PREFIX "virtual-session: " | |
31 | #define sr_log(l, s, args...) sr_log(l, LOG_PREFIX s, ## args) | |
32 | #define sr_spew(s, args...) sr_spew(LOG_PREFIX s, ## args) | |
33 | #define sr_dbg(s, args...) sr_dbg(LOG_PREFIX s, ## args) | |
34 | #define sr_info(s, args...) sr_info(LOG_PREFIX s, ## args) | |
35 | #define sr_warn(s, args...) sr_warn(LOG_PREFIX s, ## args) | |
36 | #define sr_err(s, args...) sr_err(LOG_PREFIX 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, LOG_PREFIX); | |
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 | }; |