2 * This file is part of the sigrok project.
4 * Copyright (C) 2010 Bert Vermeulen <bert@biot.com>
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.
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.
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/>.
23 #include <sigrok-internal.h>
25 static GSList *devices = NULL;
28 * Scan the system for attached logic analyzers / devices.
30 * This will try to autodetect all supported logic analyzer devices:
32 * - Those attached via USB (can be reliably detected via USB VID/PID).
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.
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...
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.
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.
52 * After the system has been scanned for devices, the list of detected (and
53 * supported) devices can be acquired via sr_device_list().
56 * TODO: Option to only scan for specific devices or device classes.
58 * @return SR_OK upon success, SR_ERR upon errors.
60 int sr_device_scan(void)
63 struct sr_device_plugin *plugin;
65 if (!(plugins = sr_list_hwplugins())) {
66 sr_err("dev: %s: no supported devices/hwplugins", __func__);
67 return SR_ERR; /* TODO: More specific error? */
71 * Initialize all plugins first. Since the init() call may involve
72 * a firmware upload and associated delay, we may as well get all
73 * of these out of the way first.
75 for (l = plugins; l; l = l->next) {
77 /* TODO: Handle 'plugin' being NULL. */
78 sr_init_hwplugins(plugin);
85 * Return the list of logic analyzer devices libsigrok has detected.
87 * If the libsigrok-internal device list is empty, a scan for attached
88 * devices -- via a call to sr_device_scan() -- is performed first.
90 * TODO: Error handling?
92 * @return The list (GSList) of detected devices, or NULL if none were found.
94 GSList *sr_device_list(void)
103 * Create a new device.
105 * TODO: num_probes should be uint16_t.
106 * TODO: Should return int, so that we can return SR_OK, SR_ERR_* etc.
108 * It is the caller's responsibility to g_free() the allocated memory when
109 * no longer needed. TODO: Using which API function?
111 * @param plugin TODO.
112 * If 'plugin' is NULL, the created device is a "virtual" one.
113 * @param plugin_index TODO
114 * @param num_probes The number of probes (>= 1) this device has.
117 * @return Pointer to the newly allocated device, or NULL upon errors.
119 struct sr_device *sr_device_new(const struct sr_device_plugin *plugin,
120 int plugin_index, int num_probes)
122 struct sr_device *device;
126 sr_err("dev: %s: plugin was NULL", __func__);
127 return NULL; /* TODO: SR_ERR_ARG */
130 /* TODO: Check if plugin_index valid? */
132 /* TODO: Check if num_probes valid? */
134 if (!(device = g_try_malloc0(sizeof(struct sr_device)))) {
135 sr_err("dev: %s: device malloc failed", __func__);
139 device->plugin = (struct sr_device_plugin *)plugin;
140 device->plugin_index = plugin_index;
141 devices = g_slist_append(devices, device);
143 for (i = 0; i < num_probes; i++)
144 sr_device_probe_add(device, NULL); /* TODO: Check return value. */
150 * Clear all probes of the specified device.
152 * This removes/clears the 'name' and 'trigger' fields of all probes of
155 * The order in which the probes are cleared is not specified. The caller
156 * should not assume or rely on a specific order.
158 * TODO: Rename to sr_device_clear_probes() or sr_device_probe_clear_all().
160 * @param device The device whose probes to clear. Must not be NULL.
161 * Note: device->probes is allowed to be NULL (in that case,
162 * there are no probes, thus none have to be cleared).
164 * @return SR_OK upon success, SR_ERR_ARG upon invalid arguments.
165 * If something other than SR_OK is returned, 'device' is unchanged.
167 int sr_device_clear(struct sr_device *device)
172 sr_err("dev: %s: device was NULL", __func__);
176 /* Note: device->probes can be NULL, this is handled correctly. */
178 for (pnum = 1; pnum <= g_slist_length(device->probes); pnum++)
179 sr_device_probe_clear(device, pnum);
185 * Clear the specified probe in the specified device.
187 * The probe itself still exists afterwards, but its 'name' and 'trigger'
188 * fields are g_free()'d and set to NULL.
190 * @param device The device in which the specified (to be cleared) probe
191 * resides. Must not be NULL.
192 * @param probenum The number of the probe to clear.
193 * Note that the probe numbers start at 1 (not 0!).
195 * @return SR_OK upon success, SR_ERR_ARG upon invalid arguments, or SR_ERR
197 * If something other than SR_OK is returned, 'device' is unchanged.
199 int sr_device_probe_clear(struct sr_device *device, int probenum)
204 sr_err("dev: %s: device was NULL", __func__);
208 /* TODO: Sanity check on 'probenum'. */
210 if (!(p = sr_device_probe_find(device, probenum))) {
211 sr_err("dev: %s: probe %d not found", __func__, probenum);
212 return SR_ERR; /* TODO: More specific error? */
215 /* If the probe has a name, remove it. */
221 /* If the probe has a trigger, remove it. */
231 * Add a probe with the specified name to the specified device.
233 * The added probe is automatically enabled (the 'enabled' field is TRUE).
235 * The 'trigger' field of the added probe is set to NULL. A trigger can be
236 * added via sr_device_trigger_set().
238 * TODO: Are duplicate names allowed?
239 * TODO: Do we enforce a maximum probe number for a device?
240 * TODO: Error if the max. probe number for the specific LA is reached, e.g.
241 * if the caller tries to add more probes than the device actually has.
243 * @param device The device to which to add a probe with the specified name.
245 * @param name The name of the probe to add to this device. Must not be NULL.
246 * TODO: Maximum length, allowed characters, etc.
248 * @return SR_OK upon success, SR_ERR_MALLOC upon memory allocation errors,
249 * or SR_ERR_ARG upon invalid arguments.
250 * If something other than SR_OK is returned, 'device' is unchanged.
252 int sr_device_probe_add(struct sr_device *device, const char *name)
255 char probename[16]; /* FIXME: Don't hardcode 16? #define? */
259 sr_err("dev: %s: device was NULL", __func__);
264 sr_err("dev: %s: name was NULL", __func__);
268 /* TODO: Further checks to ensure name is valid. */
270 probenum = g_slist_length(device->probes) + 1;
272 if (!(p = g_try_malloc0(sizeof(struct sr_probe)))) {
273 sr_err("dev: %s: p malloc failed", __func__);
274 return SR_ERR_MALLOC;
280 p->name = g_strdup(name);
282 snprintf(probename, 16, "%d", probenum);
283 p->name = g_strdup(probename);
286 device->probes = g_slist_append(device->probes, p);
292 * Find the probe with the specified number in the specified device.
296 * @param device TODO. Must not be NULL.
297 * @param probenum The number of the probe whose 'struct sr_probe' we want.
298 * Note that the probe numbers start at 1 (not 0!).
300 * TODO: Should return int.
301 * TODO: probenum should be unsigned.
303 * @return A pointer to the requested probe's 'struct sr_probe', or NULL
304 * if the probe could not be found.
306 struct sr_probe *sr_device_probe_find(const struct sr_device *device,
310 struct sr_probe *p, *found_probe;
313 sr_err("dev: %s: device was NULL", __func__);
314 return NULL; /* TODO: SR_ERR_ARG */
317 /* TODO: Sanity check on probenum. */
320 for (l = device->probes; l; l = l->next) {
322 /* TODO: Check for p != NULL. */
323 if (p->index == probenum) {
333 * Set the name of the specified probe in the specified device.
335 * If the probe already has a different name assigned to it, it will be
336 * removed, and the new name will be saved instead.
338 * TODO: Rename to sr_device_set_probe_name().
341 * @param probenum The number of the probe whose name to set.
342 * Note that the probe numbers start at 1 (not 0!).
343 * @param name The new name that the specified probe should get.
345 * @return SR_OK upon success, SR_ERR_ARG upon invalid arguments, or SR_ERR
347 * If something other than SR_OK is returned, 'device' is unchanged.
349 int sr_device_probe_name(struct sr_device *device, int probenum,
355 sr_err("dev: %s: device was NULL", __func__);
359 p = sr_device_probe_find(device, probenum);
361 sr_err("dev: %s: probe %d not found", __func__, probenum);
362 return SR_ERR; /* TODO: More specific error? */
365 /* TODO: Sanity check on 'name'. */
367 /* If the probe already has a name, kill it first. */
371 p->name = g_strdup(name);
377 * Remove all triggers set up for the specified device.
379 * TODO: Better description.
383 * @return SR_OK upon success, SR_ERR_ARG upon invalid arguments.
384 * If something other than SR_OK is returned, 'device' is unchanged.
386 int sr_device_trigger_clear(struct sr_device *device)
389 unsigned int pnum; /* TODO: uint16_t? */
392 sr_err("dev: %s: device was NULL", __func__);
396 if (!device->probes) {
397 sr_err("dev: %s: device->probes was NULL", __func__);
401 for (pnum = 1; pnum <= g_slist_length(device->probes); pnum++) {
402 p = sr_device_probe_find(device, pnum);
403 /* TODO: Silently ignore probes which cannot be found? */
404 if (p && p->trigger) {
414 * Add a trigger to the specified device.
416 * TODO: Better description.
417 * TODO: Describe valid format of the 'trigger' string.
419 * @param device TODO. Must not be NULL.
420 * @param probenum The number of the probe. TODO.
421 * Note that the probe numbers start at 1 (not 0!).
422 * @param trigger TODO.
423 * TODO: Is NULL allowed?
425 * @return SR_OK upon success, SR_ERR_ARG upon invalid arguments, or SR_ERR
427 * If something other than SR_OK is returned, 'device' is unchanged.
429 int sr_device_trigger_set(struct sr_device *device, int probenum,
435 sr_err("dev: %s: device was NULL", __func__);
439 /* TODO: Sanity check on 'probenum'. */
441 /* TODO: Sanity check on 'trigger'. */
443 p = sr_device_probe_find(device, probenum);
445 sr_err("dev: %s: probe %d not found", __func__, probenum);
446 return SR_ERR; /* TODO: More specific error? */
449 /* If the probe already has a trigger, kill it first. */
453 p->trigger = g_strdup(trigger);
459 * Determine whether the specified device has the specified capability.
461 * TODO: Should return int?
463 * @param device Pointer to the device to be checked. Must not be NULL.
464 * The device's 'plugin' field must not be NULL either.
465 * @param hwcap The capability that should be checked (whether it's supported
466 * by the specified device).
468 * @return TRUE, if the device has the specified capability, FALSE otherwise.
469 * FALSE is also returned upon invalid input parameters or other
472 gboolean sr_device_has_hwcap(const struct sr_device *device, int hwcap)
474 int *capabilities, i;
477 sr_err("dev: %s: device was NULL", __func__);
478 return FALSE; /* TODO: SR_ERR_ARG. */
481 if (!device->plugin) {
482 sr_err("dev: %s: device->plugin was NULL", __func__);
483 return FALSE; /* TODO: SR_ERR_ARG. */
486 /* TODO: Sanity check on 'hwcap'. */
488 if (!(capabilities = device->plugin->get_capabilities())) {
489 sr_err("dev: %s: device has no capabilities", __func__);
490 return FALSE; /* TODO: SR_ERR*. */
493 for (i = 0; capabilities[i]; i++) {
494 if (capabilities[i] != hwcap)
496 sr_spew("dev: %s: found hwcap %d", __func__, hwcap);
500 sr_spew("dev: %s: hwcap %d not found", __func__, hwcap);