/* * This file is part of the sigrok project. * * Copyright (C) 2010-2012 Bert Vermeulen * * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see . */ #include #include #include "sigrok.h" #include "sigrok-internal.h" static GSList *devs = NULL; /** * Scan the system for attached logic analyzers / devices. * * This will try to autodetect all supported logic analyzer devices: * * - Those attached via USB (can be reliably detected via USB VID/PID). * * - Those using a (real or virtual) serial port (detected by sending * device-specific commands to all OS-specific serial port devices such * as /dev/ttyS*, /dev/ttyUSB*, /dev/ttyACM*, and others). * The autodetection for this kind of devices can potentially be unreliable. * * Also, sending various bytes/commands to (all!) devices which happen to * be attached to the system via a (real or virtual) serial port can be * problematic. There is no way for libsigrok to know how unknown devices * react to the bytes libsigrok sends. Potentially they could lead to the * device getting into invalid/error states, losing/overwriting data, or... * * In addition to the detection, the devices that are found are also * initialized automatically. On some devices, this involves a firmware upload, * or other such measures. * * The order in which the system is scanned for devices is not specified. The * caller should not assume or rely on any specific order. * * After the system has been scanned for devices, the list of detected (and * supported) devices can be acquired via sr_dev_list(). * * TODO: Error checks? * TODO: Option to only scan for specific devices or device classes. * * @return SR_OK upon success, SR_ERR_BUG upon internal errors. */ SR_API int sr_dev_scan(void) { int i; struct sr_dev_driver **drivers; drivers = sr_driver_list(); if (!drivers[0]) { sr_err("dev: %s: no supported hardware drivers", __func__); return SR_ERR_BUG; } /* * Initialize all drivers first. Since the init() call may involve * a firmware upload and associated delay, we may as well get all * of these out of the way first. */ for (i = 0; drivers[i]; i++) sr_driver_init(drivers[i]); return SR_OK; } /** * Return the list of logic analyzer devices libsigrok has detected. * * If the libsigrok-internal device list is empty, a scan for attached * devices -- via a call to sr_dev_scan() -- is performed first. * * TODO: Error handling? * * @return The list (GSList) of detected devices, or NULL if none were found. */ SR_API GSList *sr_dev_list(void) { if (!devs) sr_dev_scan(); return devs; } /** * Create a new device. * * The device is added to the (libsigrok-internal) list of devices, but * additionally a pointer to the newly created device is also returned. * * The device has no probes attached to it yet after this call. You can * use sr_dev_probe_add() to add one or more probes. * * TODO: Should return int, so that we can return SR_OK, SR_ERR_* etc. * * It is the caller's responsibility to g_free() the allocated memory when * no longer needed. TODO: Using which API function? * * @param driver TODO. * If 'driver' is NULL, the created device is a "virtual" one. * @param driver_index TODO * * @return Pointer to the newly allocated device, or NULL upon errors. */ SR_API struct sr_dev *sr_dev_new(const struct sr_dev_driver *driver, int driver_index) { struct sr_dev *dev; /* TODO: Check if driver_index valid? */ if (!(dev = g_try_malloc0(sizeof(struct sr_dev)))) { sr_err("dev: %s: dev malloc failed", __func__); return NULL; } dev->driver = (struct sr_dev_driver *)driver; dev->driver_index = driver_index; devs = g_slist_append(devs, dev); return dev; } /** * Add a probe with the specified name to the specified device. * * The added probe is automatically enabled (the 'enabled' field is TRUE). * * The 'trigger' field of the added probe is set to NULL. A trigger can be * added via sr_dev_trigger_set(). * * TODO: Are duplicate names allowed? * TODO: Do we enforce a maximum probe number for a device? * TODO: Error if the max. probe number for the specific LA is reached, e.g. * if the caller tries to add more probes than the device actually has. * * @param dev The device to which to add a probe with the specified name. * Must not be NULL. * @param name The name of the probe to add to this device. Must not be NULL. * TODO: Maximum length, allowed characters, etc. * * @return SR_OK upon success, SR_ERR_MALLOC upon memory allocation errors, * or SR_ERR_ARG upon invalid arguments. * If something other than SR_OK is returned, 'dev' is unchanged. */ SR_API int sr_dev_probe_add(struct sr_dev *dev, const char *name) { struct sr_probe *p; int probenum; if (!dev) { sr_err("dev: %s: dev was NULL", __func__); return SR_ERR_ARG; } if (!name) { sr_err("dev: %s: name was NULL", __func__); return SR_ERR_ARG; } /* TODO: Further checks to ensure name is valid. */ probenum = g_slist_length(dev->probes) + 1; if (!(p = g_try_malloc0(sizeof(struct sr_probe)))) { sr_err("dev: %s: p malloc failed", __func__); return SR_ERR_MALLOC; } p->index = probenum; p->enabled = TRUE; p->name = g_strdup(name); p->trigger = NULL; dev->probes = g_slist_append(dev->probes, p); return SR_OK; } /** * Find the probe with the specified number in the specified device. * * TODO * * @param dev TODO. Must not be NULL. * @param probenum The number of the probe whose 'struct sr_probe' we want. * Note that the probe numbers start at 1 (not 0!). * * TODO: Should return int. * TODO: probenum should be unsigned. * * @return A pointer to the requested probe's 'struct sr_probe', or NULL * if the probe could not be found. */ SR_API struct sr_probe *sr_dev_probe_find(const struct sr_dev *dev, int probenum) { GSList *l; struct sr_probe *p, *found_probe; if (!dev) { sr_err("dev: %s: dev was NULL", __func__); return NULL; /* TODO: SR_ERR_ARG */ } /* TODO: Sanity check on probenum. */ found_probe = NULL; for (l = dev->probes; l; l = l->next) { p = l->data; /* TODO: Check for p != NULL. */ if (p->index == probenum) { found_probe = p; break; } } return found_probe; } /** * Set the name of the specified probe in the specified device. * * If the probe already has a different name assigned to it, it will be * removed, and the new name will be saved instead. * * @param dev TODO * @param probenum The number of the probe whose name to set. * Note that the probe numbers start at 1 (not 0!). * @param name The new name that the specified probe should get. * * @return SR_OK upon success, SR_ERR_ARG upon invalid arguments, or SR_ERR * upon other errors. * If something other than SR_OK is returned, 'dev' is unchanged. */ SR_API int sr_dev_probe_name_set(struct sr_dev *dev, int probenum, const char *name) { struct sr_probe *p; if (!dev) { sr_err("dev: %s: dev was NULL", __func__); return SR_ERR_ARG; } p = sr_dev_probe_find(dev, probenum); if (!p) { sr_err("dev: %s: probe %d not found", __func__, probenum); return SR_ERR; /* TODO: More specific error? */ } /* TODO: Sanity check on 'name'. */ /* If the probe already has a name, kill it first. */ g_free(p->name); p->name = g_strdup(name); return SR_OK; } /** * Remove all triggers set up for the specified device. * * TODO: Better description. * * @param dev TODO * * @return SR_OK upon success, SR_ERR_ARG upon invalid arguments. * If something other than SR_OK is returned, 'dev' is unchanged. */ SR_API int sr_dev_trigger_remove_all(struct sr_dev *dev) { struct sr_probe *p; unsigned int pnum; /* TODO: uint16_t? */ if (!dev) { sr_err("dev: %s: dev was NULL", __func__); return SR_ERR_ARG; } if (!dev->probes) { sr_err("dev: %s: dev->probes was NULL", __func__); return SR_ERR_ARG; } for (pnum = 1; pnum <= g_slist_length(dev->probes); pnum++) { p = sr_dev_probe_find(dev, pnum); /* TODO: Silently ignore probes which cannot be found? */ if (p) { g_free(p->trigger); p->trigger = NULL; } } return SR_OK; } /** * Add a trigger to the specified device (and the specified probe). * * If the specified probe of this device already has a trigger, it will * be silently replaced. * * TODO: Better description. * TODO: Describe valid format of the 'trigger' string. * * @param dev TODO. Must not be NULL. * @param probenum The number of the probe. TODO. * Note that the probe numbers start at 1 (not 0!). * @param trigger TODO. * TODO: Is NULL allowed? * * @return SR_OK upon success, SR_ERR_ARG upon invalid arguments, or SR_ERR * upon other errors. * If something other than SR_OK is returned, 'dev' is unchanged. */ SR_API int sr_dev_trigger_set(struct sr_dev *dev, int probenum, const char *trigger) { struct sr_probe *p; if (!dev) { sr_err("dev: %s: dev was NULL", __func__); return SR_ERR_ARG; } /* TODO: Sanity check on 'probenum'. */ /* TODO: Sanity check on 'trigger'. */ p = sr_dev_probe_find(dev, probenum); if (!p) { sr_err("dev: %s: probe %d not found", __func__, probenum); return SR_ERR; /* TODO: More specific error? */ } /* If the probe already has a trigger, kill it first. */ g_free(p->trigger); p->trigger = g_strdup(trigger); return SR_OK; } /** * Determine whether the specified device has the specified capability. * * @param dev Pointer to the device to be checked. Must not be NULL. * If the device's 'driver' field is NULL (virtual device), this * function will always return FALSE (virtual devices don't have * a hardware capabilities list). * @param hwcap The capability that should be checked (whether it's supported * by the specified device). * * @return TRUE, if the device has the specified capability, FALSE otherwise. * FALSE is also returned upon invalid input parameters or other * error conditions. */ SR_API gboolean sr_dev_has_hwcap(const struct sr_dev *dev, int hwcap) { int *hwcaps, i; sr_spew("dev: %s: requesting hwcap %d", __func__, hwcap); if (!dev) { sr_err("dev: %s: dev was NULL", __func__); return FALSE; } /* * Virtual devices (which have dev->driver set to NULL) always say that * they don't have the capability (they can't call hwcap_get_all()). */ if (!dev->driver) { sr_dbg("dev: %s: dev->driver was NULL, this seems to be " "a virtual device without capabilities", __func__); return FALSE; } /* TODO: Sanity check on 'hwcap'. */ if (!(hwcaps = dev->driver->hwcap_get_all())) { sr_err("dev: %s: dev has no capabilities", __func__); return FALSE; } for (i = 0; hwcaps[i]; i++) { if (hwcaps[i] != hwcap) continue; sr_spew("dev: %s: found hwcap %d", __func__, hwcap); return TRUE; } sr_spew("dev: %s: hwcap %d not found", __func__, hwcap); return FALSE; } /** * Returns information about the given device. * * @param dev Pointer to the device to be checked. Must not be NULL. * The device's 'driver' field must not be NULL either. * @param id The type of information. * @param data The return value. Must not be NULL. * * @return SR_OK upon success, SR_ERR_ARG upon invalid arguments, or SR_ERR * upon other errors. */ SR_API int sr_dev_info_get(const struct sr_dev *dev, int id, const void **data) { if ((dev == NULL) || (dev->driver == NULL)) return SR_ERR_ARG; if (data == NULL) return SR_ERR_ARG; *data = dev->driver->dev_info_get(dev->driver_index, id); if (*data == NULL) return SR_ERR; return SR_OK; }