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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 <stdio.h> | |
21 | #include <glib.h> | |
22 | #include "libsigrok.h" | |
23 | #include "libsigrok-internal.h" | |
24 | ||
25 | static GSList *devs = NULL; | |
26 | ||
27 | /** | |
28 | * Scan the system for attached logic analyzers / devices. | |
29 | * | |
30 | * This will try to autodetect all supported logic analyzer devices: | |
31 | * | |
32 | * - Those attached via USB (can be reliably detected via USB VID/PID). | |
33 | * | |
34 | * - Those using a (real or virtual) serial port (detected by sending | |
35 | * device-specific commands to all OS-specific serial port devices such | |
36 | * as /dev/ttyS*, /dev/ttyUSB*, /dev/ttyACM*, and others). | |
37 | * The autodetection for this kind of devices can potentially be unreliable. | |
38 | * | |
39 | * Also, sending various bytes/commands to (all!) devices which happen to | |
40 | * be attached to the system via a (real or virtual) serial port can be | |
41 | * problematic. There is no way for libsigrok to know how unknown devices | |
42 | * react to the bytes libsigrok sends. Potentially they could lead to the | |
43 | * device getting into invalid/error states, losing/overwriting data, or... | |
44 | * | |
45 | * In addition to the detection, the devices that are found are also | |
46 | * initialized automatically. On some devices, this involves a firmware upload, | |
47 | * or other such measures. | |
48 | * | |
49 | * The order in which the system is scanned for devices is not specified. The | |
50 | * caller should not assume or rely on any specific order. | |
51 | * | |
52 | * After the system has been scanned for devices, the list of detected (and | |
53 | * supported) devices can be acquired via sr_dev_list(). | |
54 | * | |
55 | * TODO: Error checks? | |
56 | * TODO: Option to only scan for specific devices or device classes. | |
57 | * | |
58 | * @return SR_OK upon success, SR_ERR_BUG upon internal errors. | |
59 | */ | |
60 | SR_API int sr_dev_scan(void) | |
61 | { | |
62 | int i; | |
63 | struct sr_dev_driver **drivers; | |
64 | ||
65 | drivers = sr_driver_list(); | |
66 | if (!drivers[0]) { | |
67 | sr_err("dev: %s: no supported hardware drivers", __func__); | |
68 | return SR_ERR_BUG; | |
69 | } | |
70 | ||
71 | /* | |
72 | * Initialize all drivers first. Since the init() call may involve | |
73 | * a firmware upload and associated delay, we may as well get all | |
74 | * of these out of the way first. | |
75 | */ | |
76 | for (i = 0; drivers[i]; i++) | |
77 | sr_driver_init(drivers[i]); | |
78 | ||
79 | return SR_OK; | |
80 | } | |
81 | ||
82 | /** | |
83 | * Return the list of logic analyzer devices libsigrok has detected. | |
84 | * | |
85 | * If the libsigrok-internal device list is empty, a scan for attached | |
86 | * devices -- via a call to sr_dev_scan() -- is performed first. | |
87 | * | |
88 | * TODO: Error handling? | |
89 | * | |
90 | * @return The list (GSList) of detected devices, or NULL if none were found. | |
91 | */ | |
92 | SR_API GSList *sr_dev_list(void) | |
93 | { | |
94 | if (!devs) | |
95 | sr_dev_scan(); | |
96 | ||
97 | return devs; | |
98 | } | |
99 | ||
100 | /** | |
101 | * Create a new device. | |
102 | * | |
103 | * The device is added to the (libsigrok-internal) list of devices, but | |
104 | * additionally a pointer to the newly created device is also returned. | |
105 | * | |
106 | * The device has no probes attached to it yet after this call. You can | |
107 | * use sr_dev_probe_add() to add one or more probes. | |
108 | * | |
109 | * TODO: Should return int, so that we can return SR_OK, SR_ERR_* etc. | |
110 | * | |
111 | * It is the caller's responsibility to g_free() the allocated memory when | |
112 | * no longer needed. TODO: Using which API function? | |
113 | * | |
114 | * @param driver TODO. | |
115 | * If 'driver' is NULL, the created device is a "virtual" one. | |
116 | * @param driver_index TODO | |
117 | * | |
118 | * @return Pointer to the newly allocated device, or NULL upon errors. | |
119 | */ | |
120 | SR_API struct sr_dev *sr_dev_new(const struct sr_dev_driver *driver, | |
121 | int driver_index) | |
122 | { | |
123 | struct sr_dev *dev; | |
124 | ||
125 | /* TODO: Check if driver_index valid? */ | |
126 | ||
127 | if (!(dev = g_try_malloc0(sizeof(struct sr_dev)))) { | |
128 | sr_err("dev: %s: dev malloc failed", __func__); | |
129 | return NULL; | |
130 | } | |
131 | ||
132 | dev->driver = (struct sr_dev_driver *)driver; | |
133 | dev->driver_index = driver_index; | |
134 | devs = g_slist_append(devs, dev); | |
135 | ||
136 | return dev; | |
137 | } | |
138 | ||
139 | /** | |
140 | * Add a probe with the specified name to the specified device. | |
141 | * | |
142 | * The added probe is automatically enabled (the 'enabled' field is TRUE). | |
143 | * | |
144 | * The 'trigger' field of the added probe is set to NULL. A trigger can be | |
145 | * added via sr_dev_trigger_set(). | |
146 | * | |
147 | * TODO: Are duplicate names allowed? | |
148 | * TODO: Do we enforce a maximum probe number for a device? | |
149 | * TODO: Error if the max. probe number for the specific LA is reached, e.g. | |
150 | * if the caller tries to add more probes than the device actually has. | |
151 | * | |
152 | * @param dev The device to which to add a probe with the specified name. | |
153 | * Must not be NULL. | |
154 | * @param name The name of the probe to add to this device. Must not be NULL. | |
155 | * TODO: Maximum length, allowed characters, etc. | |
156 | * | |
157 | * @return SR_OK upon success, SR_ERR_MALLOC upon memory allocation errors, | |
158 | * or SR_ERR_ARG upon invalid arguments. | |
159 | * If something other than SR_OK is returned, 'dev' is unchanged. | |
160 | */ | |
161 | SR_API int sr_dev_probe_add(struct sr_dev *dev, const char *name) | |
162 | { | |
163 | struct sr_probe *p; | |
164 | int probenum; | |
165 | ||
166 | if (!dev) { | |
167 | sr_err("dev: %s: dev was NULL", __func__); | |
168 | return SR_ERR_ARG; | |
169 | } | |
170 | ||
171 | if (!name) { | |
172 | sr_err("dev: %s: name was NULL", __func__); | |
173 | return SR_ERR_ARG; | |
174 | } | |
175 | ||
176 | /* TODO: Further checks to ensure name is valid. */ | |
177 | ||
178 | probenum = g_slist_length(dev->probes) + 1; | |
179 | ||
180 | if (!(p = g_try_malloc0(sizeof(struct sr_probe)))) { | |
181 | sr_err("dev: %s: p malloc failed", __func__); | |
182 | return SR_ERR_MALLOC; | |
183 | } | |
184 | ||
185 | p->index = probenum; | |
186 | p->enabled = TRUE; | |
187 | p->name = g_strdup(name); | |
188 | p->trigger = NULL; | |
189 | dev->probes = g_slist_append(dev->probes, p); | |
190 | ||
191 | return SR_OK; | |
192 | } | |
193 | ||
194 | /** | |
195 | * Find the probe with the specified number in the specified device. | |
196 | * | |
197 | * TODO | |
198 | * | |
199 | * @param dev TODO. Must not be NULL. | |
200 | * @param probenum The number of the probe whose 'struct sr_probe' we want. | |
201 | * Note that the probe numbers start at 1 (not 0!). | |
202 | * | |
203 | * TODO: Should return int. | |
204 | * TODO: probenum should be unsigned. | |
205 | * | |
206 | * @return A pointer to the requested probe's 'struct sr_probe', or NULL | |
207 | * if the probe could not be found. | |
208 | */ | |
209 | SR_API struct sr_probe *sr_dev_probe_find(const struct sr_dev *dev, | |
210 | int probenum) | |
211 | { | |
212 | GSList *l; | |
213 | struct sr_probe *p, *found_probe; | |
214 | ||
215 | if (!dev) { | |
216 | sr_err("dev: %s: dev was NULL", __func__); | |
217 | return NULL; /* TODO: SR_ERR_ARG */ | |
218 | } | |
219 | ||
220 | /* TODO: Sanity check on probenum. */ | |
221 | ||
222 | found_probe = NULL; | |
223 | for (l = dev->probes; l; l = l->next) { | |
224 | p = l->data; | |
225 | /* TODO: Check for p != NULL. */ | |
226 | if (p->index == probenum) { | |
227 | found_probe = p; | |
228 | break; | |
229 | } | |
230 | } | |
231 | ||
232 | return found_probe; | |
233 | } | |
234 | ||
235 | /** | |
236 | * Set the name of the specified probe in the specified device. | |
237 | * | |
238 | * If the probe already has a different name assigned to it, it will be | |
239 | * removed, and the new name will be saved instead. | |
240 | * | |
241 | * @param dev TODO | |
242 | * @param probenum The number of the probe whose name to set. | |
243 | * Note that the probe numbers start at 1 (not 0!). | |
244 | * @param name The new name that the specified probe should get. | |
245 | * | |
246 | * @return SR_OK upon success, SR_ERR_ARG upon invalid arguments, or SR_ERR | |
247 | * upon other errors. | |
248 | * If something other than SR_OK is returned, 'dev' is unchanged. | |
249 | */ | |
250 | SR_API int sr_dev_probe_name_set(struct sr_dev *dev, int probenum, | |
251 | const char *name) | |
252 | { | |
253 | struct sr_probe *p; | |
254 | ||
255 | if (!dev) { | |
256 | sr_err("dev: %s: dev was NULL", __func__); | |
257 | return SR_ERR_ARG; | |
258 | } | |
259 | ||
260 | p = sr_dev_probe_find(dev, probenum); | |
261 | if (!p) { | |
262 | sr_err("dev: %s: probe %d not found", __func__, probenum); | |
263 | return SR_ERR; /* TODO: More specific error? */ | |
264 | } | |
265 | ||
266 | /* TODO: Sanity check on 'name'. */ | |
267 | ||
268 | /* If the probe already has a name, kill it first. */ | |
269 | g_free(p->name); | |
270 | ||
271 | p->name = g_strdup(name); | |
272 | ||
273 | return SR_OK; | |
274 | } | |
275 | ||
276 | /** | |
277 | * Remove all triggers set up for the specified device. | |
278 | * | |
279 | * TODO: Better description. | |
280 | * | |
281 | * @param dev TODO | |
282 | * | |
283 | * @return SR_OK upon success, SR_ERR_ARG upon invalid arguments. | |
284 | * If something other than SR_OK is returned, 'dev' is unchanged. | |
285 | */ | |
286 | SR_API int sr_dev_trigger_remove_all(struct sr_dev *dev) | |
287 | { | |
288 | struct sr_probe *p; | |
289 | unsigned int pnum; /* TODO: uint16_t? */ | |
290 | ||
291 | if (!dev) { | |
292 | sr_err("dev: %s: dev was NULL", __func__); | |
293 | return SR_ERR_ARG; | |
294 | } | |
295 | ||
296 | if (!dev->probes) { | |
297 | sr_err("dev: %s: dev->probes was NULL", __func__); | |
298 | return SR_ERR_ARG; | |
299 | } | |
300 | ||
301 | for (pnum = 1; pnum <= g_slist_length(dev->probes); pnum++) { | |
302 | p = sr_dev_probe_find(dev, pnum); | |
303 | /* TODO: Silently ignore probes which cannot be found? */ | |
304 | if (p) { | |
305 | g_free(p->trigger); | |
306 | p->trigger = NULL; | |
307 | } | |
308 | } | |
309 | ||
310 | return SR_OK; | |
311 | } | |
312 | ||
313 | /** | |
314 | * Add a trigger to the specified device (and the specified probe). | |
315 | * | |
316 | * If the specified probe of this device already has a trigger, it will | |
317 | * be silently replaced. | |
318 | * | |
319 | * TODO: Better description. | |
320 | * TODO: Describe valid format of the 'trigger' string. | |
321 | * | |
322 | * @param dev TODO. Must not be NULL. | |
323 | * @param probenum The number of the probe. TODO. | |
324 | * Note that the probe numbers start at 1 (not 0!). | |
325 | * @param trigger TODO. | |
326 | * TODO: Is NULL allowed? | |
327 | * | |
328 | * @return SR_OK upon success, SR_ERR_ARG upon invalid arguments, or SR_ERR | |
329 | * upon other errors. | |
330 | * If something other than SR_OK is returned, 'dev' is unchanged. | |
331 | */ | |
332 | SR_API int sr_dev_trigger_set(const struct sr_dev_inst *sdi, int probenum, | |
333 | const char *trigger) | |
334 | { | |
335 | GSList *l; | |
336 | struct sr_probe *probe; | |
337 | int ret; | |
338 | ||
339 | if (!sdi) | |
340 | return SR_ERR_ARG; | |
341 | ||
342 | ret = SR_ERR_ARG; | |
343 | for (l = sdi->probes; l; l = l->next) { | |
344 | probe = l->data; | |
345 | if (probe->index == probenum) { | |
346 | /* If the probe already has a trigger, kill it first. */ | |
347 | g_free(probe->trigger); | |
348 | probe->trigger = g_strdup(trigger); | |
349 | ret = SR_OK; | |
350 | break; | |
351 | } | |
352 | } | |
353 | ||
354 | return ret; | |
355 | } | |
356 | ||
357 | /** | |
358 | * Determine whether the specified device has the specified capability. | |
359 | * | |
360 | * @param dev Pointer to the device to be checked. Must not be NULL. | |
361 | * If the device's 'driver' field is NULL (virtual device), this | |
362 | * function will always return FALSE (virtual devices don't have | |
363 | * a hardware capabilities list). | |
364 | * @param hwcap The capability that should be checked (whether it's supported | |
365 | * by the specified device). | |
366 | * | |
367 | * @return TRUE, if the device has the specified capability, FALSE otherwise. | |
368 | * FALSE is also returned upon invalid input parameters or other | |
369 | * error conditions. | |
370 | */ | |
371 | SR_API gboolean sr_dev_has_hwcap(const struct sr_dev *dev, int hwcap) | |
372 | { | |
373 | const int *hwcaps; | |
374 | int i; | |
375 | ||
376 | sr_spew("dev: %s: requesting hwcap %d", __func__, hwcap); | |
377 | ||
378 | if (!dev) { | |
379 | sr_err("dev: %s: dev was NULL", __func__); | |
380 | return FALSE; | |
381 | } | |
382 | ||
383 | /* | |
384 | * Virtual devices (which have dev->driver set to NULL) always say that | |
385 | * they don't have the capability (they can't call hwcap_get_all()). | |
386 | */ | |
387 | if (!dev->driver) { | |
388 | sr_dbg("dev: %s: dev->driver was NULL, this seems to be " | |
389 | "a virtual device without capabilities", __func__); | |
390 | return FALSE; | |
391 | } | |
392 | ||
393 | /* TODO: Sanity check on 'hwcap'. */ | |
394 | ||
395 | if (dev->driver->info_get(SR_DI_HWCAPS, | |
396 | (const void **)&hwcaps, NULL) != SR_OK) { | |
397 | sr_err("dev: %s: dev has no capabilities", __func__); | |
398 | return FALSE; | |
399 | } | |
400 | ||
401 | for (i = 0; hwcaps[i]; i++) { | |
402 | if (hwcaps[i] != hwcap) | |
403 | continue; | |
404 | sr_spew("dev: %s: found hwcap %d", __func__, hwcap); | |
405 | return TRUE; | |
406 | } | |
407 | ||
408 | sr_spew("dev: %s: hwcap %d not found", __func__, hwcap); | |
409 | ||
410 | return FALSE; | |
411 | } | |
412 | ||
413 | /** | |
414 | * Returns information about the given device. | |
415 | * | |
416 | * @param dev Pointer to the device to be checked. Must not be NULL. | |
417 | * The device's 'driver' field must not be NULL either. | |
418 | * @param id The type of information. | |
419 | * @param data The return value. Must not be NULL. | |
420 | * | |
421 | * @return SR_OK upon success, SR_ERR_ARG upon invalid arguments, or SR_ERR | |
422 | * upon other errors. | |
423 | */ | |
424 | SR_API int sr_dev_info_get(const struct sr_dev *dev, int id, const void **data) | |
425 | { | |
426 | if ((dev == NULL) || (dev->driver == NULL)) | |
427 | return SR_ERR_ARG; | |
428 | ||
429 | if (data == NULL) | |
430 | return SR_ERR_ARG; | |
431 | ||
432 | *data = dev->driver->dev_info_get(dev->driver_index, id); | |
433 | ||
434 | if (*data == NULL) | |
435 | return SR_ERR; | |
436 | ||
437 | return SR_OK; | |
438 | } |