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1 | /* | |
2 | * This file is part of the libsigrok project. | |
3 | * | |
4 | * Copyright (C) 2013 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, see <http://www.gnu.org/licenses/>. | |
18 | */ | |
19 | ||
20 | /** | |
21 | * @file | |
22 | * | |
23 | * Standard API helper functions. | |
24 | * | |
25 | * @internal | |
26 | */ | |
27 | ||
28 | #include <config.h> | |
29 | #include <glib.h> | |
30 | #include <libsigrok/libsigrok.h> | |
31 | #include "libsigrok-internal.h" | |
32 | #include "scpi.h" | |
33 | ||
34 | #define LOG_PREFIX "std" | |
35 | ||
36 | /** | |
37 | * Standard sr_driver_init() API helper. | |
38 | * | |
39 | * This function can be used to simplify most driver's init() API callback. | |
40 | * | |
41 | * It creates a new 'struct drv_context' (drvc), assigns sr_ctx to it, and | |
42 | * then 'drvc' is assigned to the 'struct sr_dev_driver' (di) that is passed. | |
43 | * | |
44 | * @param di The driver instance to use. | |
45 | * @param sr_ctx The libsigrok context to assign. | |
46 | * | |
47 | * @return SR_OK upon success, SR_ERR_ARG upon invalid arguments. | |
48 | */ | |
49 | SR_PRIV int std_init(struct sr_dev_driver *di, struct sr_context *sr_ctx) | |
50 | { | |
51 | struct drv_context *drvc; | |
52 | ||
53 | drvc = g_malloc0(sizeof(struct drv_context)); | |
54 | drvc->sr_ctx = sr_ctx; | |
55 | drvc->instances = NULL; | |
56 | di->context = drvc; | |
57 | ||
58 | return SR_OK; | |
59 | } | |
60 | ||
61 | /** | |
62 | * Standard driver cleanup() callback API helper | |
63 | * | |
64 | * @param di The driver instance to use. | |
65 | * | |
66 | * Frees all device instances by calling sr_dev_clear() and then releases any | |
67 | * resources allocated by std_init(). | |
68 | * | |
69 | * @retval SR_OK Success | |
70 | * @retval SR_ERR_ARG Invalid driver | |
71 | * | |
72 | */ | |
73 | SR_PRIV int std_cleanup(const struct sr_dev_driver *di) | |
74 | { | |
75 | int ret; | |
76 | ||
77 | ret = sr_dev_clear(di); | |
78 | g_free(di->context); | |
79 | ||
80 | return ret; | |
81 | } | |
82 | ||
83 | /** | |
84 | * Standard API helper for sending an SR_DF_HEADER packet. | |
85 | * | |
86 | * This function can be used to simplify most driver's | |
87 | * dev_acquisition_start() API callback. | |
88 | * | |
89 | * @param sdi The device instance to use. | |
90 | * | |
91 | * @return SR_OK upon success, SR_ERR_ARG upon invalid arguments, or | |
92 | * SR_ERR upon other errors. | |
93 | */ | |
94 | SR_PRIV int std_session_send_df_header(const struct sr_dev_inst *sdi) | |
95 | { | |
96 | const char *prefix = (sdi->driver) ? sdi->driver->name : "unknown"; | |
97 | int ret; | |
98 | struct sr_datafeed_packet packet; | |
99 | struct sr_datafeed_header header; | |
100 | ||
101 | /* Send header packet to the session bus. */ | |
102 | sr_dbg("%s: Sending SR_DF_HEADER packet.", prefix); | |
103 | packet.type = SR_DF_HEADER; | |
104 | packet.payload = (uint8_t *)&header; | |
105 | header.feed_version = 1; | |
106 | gettimeofday(&header.starttime, NULL); | |
107 | ||
108 | if ((ret = sr_session_send(sdi, &packet)) < 0) { | |
109 | sr_err("%s: Failed to send header packet: %d.", prefix, ret); | |
110 | return ret; | |
111 | } | |
112 | ||
113 | return SR_OK; | |
114 | } | |
115 | ||
116 | /** | |
117 | * Standard API helper for sending an SR_DF_END packet. | |
118 | * | |
119 | * @param sdi The device instance to use. Must not be NULL. | |
120 | * | |
121 | * @return SR_OK upon success, SR_ERR_ARG upon invalid arguments, or | |
122 | * SR_ERR upon other errors. | |
123 | */ | |
124 | SR_PRIV int std_session_send_df_end(const struct sr_dev_inst *sdi) | |
125 | { | |
126 | const char *prefix = (sdi->driver) ? sdi->driver->name : "unknown"; | |
127 | int ret; | |
128 | struct sr_datafeed_packet packet; | |
129 | ||
130 | if (!sdi) | |
131 | return SR_ERR_ARG; | |
132 | ||
133 | sr_dbg("%s: Sending SR_DF_END packet.", prefix); | |
134 | ||
135 | packet.type = SR_DF_END; | |
136 | packet.payload = NULL; | |
137 | ||
138 | if ((ret = sr_session_send(sdi, &packet)) < 0) { | |
139 | sr_err("%s: Failed to send SR_DF_END packet: %d.", prefix, ret); | |
140 | return ret; | |
141 | } | |
142 | ||
143 | return SR_OK; | |
144 | } | |
145 | ||
146 | #ifdef HAVE_LIBSERIALPORT | |
147 | ||
148 | /** | |
149 | * Standard serial driver dev_open() helper. | |
150 | * | |
151 | * This function can be used to implement the dev_open() driver API | |
152 | * callback in drivers that use a serial port. The port is opened | |
153 | * with the SERIAL_RDWR flag. | |
154 | * | |
155 | * @retval SR_OK Success. | |
156 | * @retval SR_ERR_ARG Invalid arguments. | |
157 | * @retval SR_ERR Serial port open failed. | |
158 | */ | |
159 | SR_PRIV int std_serial_dev_open(struct sr_dev_inst *sdi) | |
160 | { | |
161 | struct sr_serial_dev_inst *serial; | |
162 | ||
163 | if (!sdi || !sdi->conn) | |
164 | return SR_ERR_ARG; | |
165 | ||
166 | serial = sdi->conn; | |
167 | ||
168 | return serial_open(serial, SERIAL_RDWR); | |
169 | } | |
170 | ||
171 | /** | |
172 | * Standard serial driver dev_close() helper. | |
173 | * | |
174 | * This function can be used to implement the dev_close() driver API | |
175 | * callback in drivers that use a serial port. | |
176 | * | |
177 | * @retval SR_OK Success. | |
178 | * @retval SR_ERR_ARG Invalid arguments. | |
179 | * @retval SR_ERR Serial port close failed. | |
180 | */ | |
181 | SR_PRIV int std_serial_dev_close(struct sr_dev_inst *sdi) | |
182 | { | |
183 | struct sr_serial_dev_inst *serial; | |
184 | ||
185 | if (!sdi || !sdi->conn) | |
186 | return SR_ERR_ARG; | |
187 | ||
188 | serial = sdi->conn; | |
189 | ||
190 | return serial_close(serial); | |
191 | } | |
192 | ||
193 | /** | |
194 | * Standard sr_session_stop() API helper. | |
195 | * | |
196 | * This function can be used to simplify most (serial port based) driver's | |
197 | * dev_acquisition_stop() API callback. | |
198 | * | |
199 | * @param sdi The device instance for which acquisition should stop. | |
200 | * Must not be NULL. | |
201 | * | |
202 | * @retval SR_OK Success. | |
203 | * @retval SR_ERR_ARG Invalid arguments. | |
204 | * @retval SR_ERR_DEV_CLOSED Device is closed. | |
205 | * @retval SR_ERR Other errors. | |
206 | */ | |
207 | SR_PRIV int std_serial_dev_acquisition_stop(struct sr_dev_inst *sdi) | |
208 | { | |
209 | struct sr_serial_dev_inst *serial = sdi->conn; | |
210 | const char *prefix = sdi->driver->name; | |
211 | int ret; | |
212 | ||
213 | if ((ret = serial_source_remove(sdi->session, serial)) < 0) { | |
214 | sr_err("%s: Failed to remove source: %d.", prefix, ret); | |
215 | return ret; | |
216 | } | |
217 | ||
218 | if ((ret = sr_dev_close(sdi)) < 0) { | |
219 | sr_err("%s: Failed to close device: %d.", prefix, ret); | |
220 | return ret; | |
221 | } | |
222 | ||
223 | std_session_send_df_end(sdi); | |
224 | ||
225 | return SR_OK; | |
226 | } | |
227 | ||
228 | #endif | |
229 | ||
230 | /** | |
231 | * Standard driver dev_clear() helper. | |
232 | * | |
233 | * Clear driver, this means, close all instances. | |
234 | * | |
235 | * This function can be used to implement the dev_clear() driver API | |
236 | * callback. dev_close() is called before every sr_dev_inst is cleared. | |
237 | * | |
238 | * The only limitation is driver-specific device contexts (sdi->priv). | |
239 | * These are freed, but any dynamic allocation within structs stored | |
240 | * there cannot be freed. | |
241 | * | |
242 | * @param driver The driver which will have its instances released. | |
243 | * @param clear_private If not NULL, this points to a function called | |
244 | * with sdi->priv as argument. The function can then clear any device | |
245 | * instance-specific resources kept there. It must also clear the struct | |
246 | * pointed to by sdi->priv. | |
247 | * | |
248 | * @return SR_OK on success. | |
249 | */ | |
250 | SR_PRIV int std_dev_clear(const struct sr_dev_driver *driver, | |
251 | std_dev_clear_callback clear_private) | |
252 | { | |
253 | struct drv_context *drvc; | |
254 | struct sr_dev_inst *sdi; | |
255 | GSList *l; | |
256 | int ret; | |
257 | ||
258 | if (!(drvc = driver->context)) | |
259 | /* Driver was never initialized, nothing to do. */ | |
260 | return SR_OK; | |
261 | ||
262 | ret = SR_OK; | |
263 | for (l = drvc->instances; l; l = l->next) { | |
264 | if (!(sdi = l->data)) { | |
265 | ret = SR_ERR_BUG; | |
266 | continue; | |
267 | } | |
268 | if (driver->dev_close) | |
269 | driver->dev_close(sdi); | |
270 | ||
271 | if (sdi->conn) { | |
272 | #ifdef HAVE_LIBSERIALPORT | |
273 | if (sdi->inst_type == SR_INST_SERIAL) | |
274 | sr_serial_dev_inst_free(sdi->conn); | |
275 | #endif | |
276 | #ifdef HAVE_LIBUSB_1_0 | |
277 | if (sdi->inst_type == SR_INST_USB) | |
278 | sr_usb_dev_inst_free(sdi->conn); | |
279 | #endif | |
280 | if (sdi->inst_type == SR_INST_SCPI) | |
281 | sr_scpi_free(sdi->conn); | |
282 | if (sdi->inst_type == SR_INST_MODBUS) | |
283 | sr_modbus_free(sdi->conn); | |
284 | } | |
285 | if (clear_private) | |
286 | /* The helper function is responsible for freeing | |
287 | * its own sdi->priv! */ | |
288 | clear_private(sdi->priv); | |
289 | else | |
290 | g_free(sdi->priv); | |
291 | ||
292 | sr_dev_inst_free(sdi); | |
293 | } | |
294 | ||
295 | g_slist_free(drvc->instances); | |
296 | drvc->instances = NULL; | |
297 | ||
298 | return ret; | |
299 | } | |
300 | ||
301 | /** | |
302 | * Standard implementation for the driver dev_list() callback | |
303 | * | |
304 | * This function can be used as the dev_list callback by most drivers that use | |
305 | * the standard helper functions. It returns the devices contained in the driver | |
306 | * context instances list. | |
307 | * | |
308 | * @param di The driver instance to use. | |
309 | * | |
310 | * @return The list of devices/instances of this driver, or NULL upon errors | |
311 | * or if the list is empty. | |
312 | */ | |
313 | SR_PRIV GSList *std_dev_list(const struct sr_dev_driver *di) | |
314 | { | |
315 | struct drv_context *drvc = di->context; | |
316 | ||
317 | return drvc->instances; | |
318 | } | |
319 | ||
320 | /** | |
321 | * Standard scan() callback API helper. | |
322 | * | |
323 | * This function can be used to perform common tasks required by a driver's | |
324 | * scan() callback. It will initialize the driver for each device on the list | |
325 | * and add the devices on the list to the driver's device instance list. | |
326 | * Usually it should be used as the last step in the scan() callback, right | |
327 | * before returning. | |
328 | * | |
329 | * Note: This function can only be used if std_init() has been called | |
330 | * previously by the driver. | |
331 | * | |
332 | * Example: | |
333 | * @code{c} | |
334 | * static GSList *scan(struct sr_dev_driver *di, GSList *options) | |
335 | * { | |
336 | * struct GSList *device; | |
337 | * struct sr_dev_inst *sdi; | |
338 | * | |
339 | * sdi = g_new0(sr_dev_inst, 1); | |
340 | * sdi->vendor = ...; | |
341 | * ... | |
342 | * devices = g_slist_append(devices, sdi); | |
343 | * ... | |
344 | * return std_scan_complete(di, devices); | |
345 | * } | |
346 | * @endcode | |
347 | * | |
348 | * @param di The driver instance to use. Must not be NULL. | |
349 | * @param devices List of newly discovered devices (struct sr_dev_inst). | |
350 | * | |
351 | * @return The @p devices list. | |
352 | */ | |
353 | SR_PRIV GSList *std_scan_complete(struct sr_dev_driver *di, GSList *devices) | |
354 | { | |
355 | struct drv_context *drvc; | |
356 | GSList *l; | |
357 | ||
358 | if (!di) { | |
359 | sr_err("Invalid driver instance (di), cannot complete scan."); | |
360 | return NULL; | |
361 | } | |
362 | ||
363 | drvc = di->context; | |
364 | ||
365 | for (l = devices; l; l = l->next) { | |
366 | struct sr_dev_inst *sdi = l->data; | |
367 | if (!sdi) { | |
368 | sr_err("Invalid driver instance, cannot complete scan."); | |
369 | return NULL; | |
370 | } | |
371 | sdi->driver = di; | |
372 | } | |
373 | ||
374 | drvc->instances = g_slist_concat(drvc->instances, g_slist_copy(devices)); | |
375 | ||
376 | return devices; | |
377 | } |