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 sr_ctx The libsigrok context to assign.
43 * @param di The driver instance to use.
44 * @param[in] prefix A driver-specific prefix string used for log messages.
46 * @return SR_OK upon success, SR_ERR_ARG upon invalid arguments.
48 SR_PRIV int std_init(struct sr_context *sr_ctx, struct sr_dev_driver *di,
51 struct drv_context *drvc;
54 sr_err("%s: Invalid driver, cannot initialize.", prefix);
58 drvc = g_malloc0(sizeof(struct drv_context));
59 drvc->sr_ctx = sr_ctx;
60 drvc->instances = NULL;
67 * Standard API helper for sending an SR_DF_HEADER packet.
69 * This function can be used to simplify most driver's
70 * dev_acquisition_start() API callback.
72 * @param sdi The device instance to use.
73 * @param prefix A driver-specific prefix string used for log messages.
74 * Must not be NULL. An empty string is allowed.
76 * @return SR_OK upon success, SR_ERR_ARG upon invalid arguments, or
77 * SR_ERR upon other errors.
79 SR_PRIV int std_session_send_df_header(const struct sr_dev_inst *sdi,
83 struct sr_datafeed_packet packet;
84 struct sr_datafeed_header header;
87 sr_err("Invalid prefix.");
91 sr_dbg("%s: Starting acquisition.", prefix);
93 /* Send header packet to the session bus. */
94 sr_dbg("%s: Sending SR_DF_HEADER packet.", prefix);
95 packet.type = SR_DF_HEADER;
96 packet.payload = (uint8_t *)&header;
97 header.feed_version = 1;
98 gettimeofday(&header.starttime, NULL);
100 if ((ret = sr_session_send(sdi, &packet)) < 0) {
101 sr_err("%s: Failed to send header packet: %d.", prefix, ret);
109 * Standard API helper for sending an SR_DF_END packet.
111 * @param sdi The device instance to use. Must not be NULL.
112 * @param prefix A driver-specific prefix string used for log messages.
113 * Must not be NULL. An empty string is allowed.
115 * @return SR_OK upon success, SR_ERR_ARG upon invalid arguments, or
116 * SR_ERR upon other errors.
118 SR_PRIV int std_session_send_df_end(const struct sr_dev_inst *sdi,
122 struct sr_datafeed_packet packet;
127 sr_dbg("%s: Sending SR_DF_END packet.", prefix);
129 packet.type = SR_DF_END;
130 packet.payload = NULL;
132 if ((ret = sr_session_send(sdi, &packet)) < 0) {
133 sr_err("%s: Failed to send SR_DF_END packet: %d.", prefix, ret);
140 #ifdef HAVE_LIBSERIALPORT
143 * Standard serial driver dev_open() helper.
145 * This function can be used to implement the dev_open() driver API
146 * callback in drivers that use a serial port. The port is opened
147 * with the SERIAL_RDWR flag.
149 * If the open succeeded, the status field of the given sdi is set
152 * @retval SR_OK Success.
153 * @retval SR_ERR Serial port open failed.
155 SR_PRIV int std_serial_dev_open(struct sr_dev_inst *sdi)
157 struct sr_serial_dev_inst *serial;
160 if (serial_open(serial, SERIAL_RDWR) != SR_OK)
163 sdi->status = SR_ST_ACTIVE;
169 * Standard serial driver dev_close() helper.
171 * This function can be used to implement the dev_close() driver API
172 * callback in drivers that use a serial port.
174 * After closing the port, the status field of the given sdi is set
177 * @retval SR_OK Success.
179 SR_PRIV int std_serial_dev_close(struct sr_dev_inst *sdi)
181 struct sr_serial_dev_inst *serial;
184 if (serial && sdi->status == SR_ST_ACTIVE) {
185 serial_close(serial);
186 sdi->status = SR_ST_INACTIVE;
193 * Standard sr_session_stop() API helper.
195 * This function can be used to simplify most (serial port based) driver's
196 * dev_acquisition_stop() API callback.
198 * @param sdi The device instance for which acquisition should stop.
200 * @param cb_data Opaque 'cb_data' pointer. Must not be NULL.
201 * @param dev_close_fn Function pointer to the driver's dev_close().
203 * @param serial The serial device instance (struct serial_dev_inst *).
205 * @param[in] prefix A driver-specific prefix string used for log messages.
206 * Must not be NULL. An empty string is allowed.
208 * @retval SR_OK Success.
209 * @retval SR_ERR_ARG Invalid arguments.
210 * @retval SR_ERR_DEV_CLOSED Device is closed.
211 * @retval SR_ERR Other errors.
213 SR_PRIV int std_serial_dev_acquisition_stop(struct sr_dev_inst *sdi,
214 dev_close_callback dev_close_fn,
215 struct sr_serial_dev_inst *serial, const char *prefix)
220 sr_err("Invalid prefix.");
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, prefix);
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;