2 * This file is part of the libsigrok project.
4 * Copyright (C) 2013 Uwe Hermann <uwe@hermann-uwe.de>
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.
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, write to the Free Software
18 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
22 * Standard API helper functions.
28 #include <libsigrok/libsigrok.h>
29 #include "libsigrok-internal.h"
32 #define LOG_PREFIX "std"
35 * Standard sr_driver_init() API helper.
37 * This function can be used to simplify most driver's init() API callback.
39 * It creates a new 'struct drv_context' (drvc), assigns sr_ctx to it, and
40 * then 'drvc' is assigned to the 'struct sr_dev_driver' (di) that is passed.
42 * @param di The driver instance to use.
43 * @param sr_ctx The libsigrok context to assign.
45 * @return SR_OK upon success, SR_ERR_ARG upon invalid arguments.
47 SR_PRIV int std_init(struct sr_dev_driver *di, struct sr_context *sr_ctx)
49 struct drv_context *drvc;
51 drvc = g_malloc0(sizeof(struct drv_context));
52 drvc->sr_ctx = sr_ctx;
53 drvc->instances = NULL;
60 * Standard driver cleanup() callback API helper
62 * @param di The driver instance to use.
64 * Frees all device instances by calling sr_dev_clear() and then releases any
65 * resources allocated by std_init().
67 * @retval SR_OK Success
68 * @retval SR_ERR_ARG Invalid driver
71 SR_PRIV int std_cleanup(const struct sr_dev_driver *di)
75 ret = sr_dev_clear(di);
82 * Standard API helper for sending an SR_DF_HEADER packet.
84 * This function can be used to simplify most driver's
85 * dev_acquisition_start() API callback.
87 * @param sdi The device instance to use.
89 * @return SR_OK upon success, SR_ERR_ARG upon invalid arguments, or
90 * SR_ERR upon other errors.
92 SR_PRIV int std_session_send_df_header(const struct sr_dev_inst *sdi)
94 const char *prefix = sdi->driver->name;
96 struct sr_datafeed_packet packet;
97 struct sr_datafeed_header header;
99 sr_dbg("%s: Starting acquisition.", prefix);
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);
108 if ((ret = sr_session_send(sdi, &packet)) < 0) {
109 sr_err("%s: Failed to send header packet: %d.", prefix, ret);
117 * Standard API helper for sending an SR_DF_END packet.
119 * @param sdi The device instance to use. Must not be NULL.
121 * @return SR_OK upon success, SR_ERR_ARG upon invalid arguments, or
122 * SR_ERR upon other errors.
124 SR_PRIV int std_session_send_df_end(const struct sr_dev_inst *sdi)
126 const char *prefix = sdi->driver->name;
128 struct sr_datafeed_packet packet;
133 sr_dbg("%s: Sending SR_DF_END packet.", prefix);
135 packet.type = SR_DF_END;
136 packet.payload = NULL;
138 if ((ret = sr_session_send(sdi, &packet)) < 0) {
139 sr_err("%s: Failed to send SR_DF_END packet: %d.", prefix, ret);
146 #ifdef HAVE_LIBSERIALPORT
149 * Standard serial driver dev_open() helper.
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.
155 * If the open succeeded, the status field of the given sdi is set
158 * @retval SR_OK Success.
159 * @retval SR_ERR Serial port open failed.
161 SR_PRIV int std_serial_dev_open(struct sr_dev_inst *sdi)
163 struct sr_serial_dev_inst *serial;
166 if (serial_open(serial, SERIAL_RDWR) != SR_OK)
169 sdi->status = SR_ST_ACTIVE;
175 * Standard serial driver dev_close() helper.
177 * This function can be used to implement the dev_close() driver API
178 * callback in drivers that use a serial port.
180 * After closing the port, the status field of the given sdi is set
183 * @retval SR_OK Success.
185 SR_PRIV int std_serial_dev_close(struct sr_dev_inst *sdi)
187 struct sr_serial_dev_inst *serial;
190 if (serial && sdi->status == SR_ST_ACTIVE) {
191 serial_close(serial);
192 sdi->status = SR_ST_INACTIVE;
199 * Standard sr_session_stop() API helper.
201 * This function can be used to simplify most (serial port based) driver's
202 * dev_acquisition_stop() API callback.
204 * @param sdi The device instance for which acquisition should stop.
206 * @param cb_data Opaque 'cb_data' pointer. Must not be NULL.
207 * @param dev_close_fn Function pointer to the driver's dev_close().
209 * @param serial The serial device instance (struct serial_dev_inst *).
212 * @retval SR_OK Success.
213 * @retval SR_ERR_ARG Invalid arguments.
214 * @retval SR_ERR_DEV_CLOSED Device is closed.
215 * @retval SR_ERR Other errors.
217 SR_PRIV int std_serial_dev_acquisition_stop(struct sr_dev_inst *sdi,
218 dev_close_callback dev_close_fn,
219 struct sr_serial_dev_inst *serial)
221 const char *prefix = sdi->driver->name;
224 if (sdi->status != SR_ST_ACTIVE) {
225 sr_err("%s: Device inactive, can't stop acquisition.", prefix);
226 return SR_ERR_DEV_CLOSED;
229 sr_dbg("%s: Stopping acquisition.", prefix);
231 if ((ret = serial_source_remove(sdi->session, serial)) < 0) {
232 sr_err("%s: Failed to remove source: %d.", prefix, ret);
236 if ((ret = dev_close_fn(sdi)) < 0) {
237 sr_err("%s: Failed to close device: %d.", prefix, ret);
241 std_session_send_df_end(sdi);
249 * Standard driver dev_clear() helper.
251 * Clear driver, this means, close all instances.
253 * This function can be used to implement the dev_clear() driver API
254 * callback. dev_close() is called before every sr_dev_inst is cleared.
256 * The only limitation is driver-specific device contexts (sdi->priv).
257 * These are freed, but any dynamic allocation within structs stored
258 * there cannot be freed.
260 * @param driver The driver which will have its instances released.
261 * @param clear_private If not NULL, this points to a function called
262 * with sdi->priv as argument. The function can then clear any device
263 * instance-specific resources kept there. It must also clear the struct
264 * pointed to by sdi->priv.
266 * @return SR_OK on success.
268 SR_PRIV int std_dev_clear(const struct sr_dev_driver *driver,
269 std_dev_clear_callback clear_private)
271 struct drv_context *drvc;
272 struct sr_dev_inst *sdi;
276 if (!(drvc = driver->context))
277 /* Driver was never initialized, nothing to do. */
281 for (l = drvc->instances; l; l = l->next) {
282 if (!(sdi = l->data)) {
286 if (driver->dev_close)
287 driver->dev_close(sdi);
290 #ifdef HAVE_LIBSERIALPORT
291 if (sdi->inst_type == SR_INST_SERIAL)
292 sr_serial_dev_inst_free(sdi->conn);
294 #ifdef HAVE_LIBUSB_1_0
295 if (sdi->inst_type == SR_INST_USB)
296 sr_usb_dev_inst_free(sdi->conn);
298 if (sdi->inst_type == SR_INST_SCPI)
299 sr_scpi_free(sdi->conn);
300 if (sdi->inst_type == SR_INST_MODBUS)
301 sr_modbus_free(sdi->conn);
304 /* The helper function is responsible for freeing
305 * its own sdi->priv! */
306 clear_private(sdi->priv);
310 sr_dev_inst_free(sdi);
313 g_slist_free(drvc->instances);
314 drvc->instances = NULL;
320 * Standard implementation for the driver dev_list() callback
322 * This function can be used as the dev_list callback by most drivers that use
323 * the standard helper functions. It returns the devices contained in the driver
324 * context instances list.
326 * @param di The driver instance to use.
328 * @return The list of devices/instances of this driver, or NULL upon errors
329 * or if the list is empty.
331 SR_PRIV GSList *std_dev_list(const struct sr_dev_driver *di)
333 struct drv_context *drvc = di->context;
335 return drvc->instances;
339 * Standard scan() callback API helper.
341 * This function can be used to perform common tasks required by a driver's
342 * scan() callback. It will initialize the driver for each device on the list
343 * and add the devices on the list to the driver's device instance list.
344 * Usually it should be used as the last step in the scan() callback, right
347 * Note: This function can only be used if std_init() has been called
348 * previously by the driver.
352 * static GSList *scan(struct sr_dev_driver *di, GSList *options)
354 * struct GSList *device;
355 * struct sr_dev_inst *sdi;
357 * sdi = g_new0(sr_dev_inst, 1);
360 * devices = g_slist_append(devices, sdi);
362 * return std_scan_complete(di, devices);
366 * @param di The driver instance to use. Must not be NULL.
367 * @param devices List of newly discovered devices (struct sr_dev_inst).
369 * @return The @p devices list.
371 SR_PRIV GSList *std_scan_complete(struct sr_dev_driver *di, GSList *devices)
373 struct drv_context *drvc;
377 sr_err("Invalid driver instance (di), cannot complete scan.");
383 for (l = devices; l; l = l->next) {
384 struct sr_dev_inst *sdi = l->data;
386 sr_err("Invalid driver instance, cannot complete scan.");
392 drvc->instances = g_slist_concat(drvc->instances, g_slist_copy(devices));