[libsigrok.git] / src / std.c

/*
 * This file is part of the libsigrok project.
 *
 * Copyright (C) 2013 Uwe Hermann <uwe@hermann-uwe.de>
 *
 * 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 2 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, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
 */

/** @file
  * Standard API helper functions.
  * @internal
  */

#include <config.h>
#include <glib.h>
#include <libsigrok/libsigrok.h>
#include "libsigrok-internal.h"
#include "scpi.h"

#define LOG_PREFIX "std"

/**
 * Standard sr_driver_init() API helper.
 *
 * This function can be used to simplify most driver's init() API callback.
 *
 * It creates a new 'struct drv_context' (drvc), assigns sr_ctx to it, and
 * then 'drvc' is assigned to the 'struct sr_dev_driver' (di) that is passed.
 *
 * @param sr_ctx The libsigrok context to assign.
 * @param di The driver instance to use.
 * @param[in] prefix A driver-specific prefix string used for log messages.
 *
 * @return SR_OK upon success, SR_ERR_ARG upon invalid arguments.
 */
SR_PRIV int std_init(struct sr_context *sr_ctx, struct sr_dev_driver *di,
		     const char *prefix)
{
	struct drv_context *drvc;

	if (!di) {
		sr_err("%s: Invalid driver, cannot initialize.", prefix);
		return SR_ERR_ARG;
	}

	drvc = g_malloc0(sizeof(struct drv_context));
	drvc->sr_ctx = sr_ctx;
	drvc->instances = NULL;
	di->context = drvc;

	return SR_OK;
}

/**
 * Standard API helper for sending an SR_DF_HEADER packet.
 *
 * This function can be used to simplify most driver's
 * dev_acquisition_start() API callback.
 *
 * @param sdi The device instance to use.
 * @param prefix A driver-specific prefix string used for log messages.
 * 		 Must not be NULL. An empty string is allowed.
 *
 * @return SR_OK upon success, SR_ERR_ARG upon invalid arguments, or
 *         SR_ERR upon other errors.
 */
SR_PRIV int std_session_send_df_header(const struct sr_dev_inst *sdi,
				       const char *prefix)
{
	int ret;
	struct sr_datafeed_packet packet;
	struct sr_datafeed_header header;

	if (!prefix) {
		sr_err("Invalid prefix.");
		return SR_ERR_ARG;
	}

	sr_dbg("%s: Starting acquisition.", prefix);

	/* Send header packet to the session bus. */
	sr_dbg("%s: Sending SR_DF_HEADER packet.", prefix);
	packet.type = SR_DF_HEADER;
	packet.payload = (uint8_t *)&header;
	header.feed_version = 1;
	gettimeofday(&header.starttime, NULL);

	if ((ret = sr_session_send(sdi, &packet)) < 0) {
		sr_err("%s: Failed to send header packet: %d.", prefix, ret);
		return ret;
	}

	return SR_OK;
}

#ifdef HAVE_LIBSERIALPORT

/**
 * Standard serial driver dev_open() helper.
 *
 * This function can be used to implement the dev_open() driver API
 * callback in drivers that use a serial port. The port is opened
 * with the SERIAL_RDWR flag.
 *
 * If the open succeeded, the status field of the given sdi is set
 * to SR_ST_ACTIVE.
 *
 * @retval SR_OK Success.
 * @retval SR_ERR Serial port open failed.
 */
SR_PRIV int std_serial_dev_open(struct sr_dev_inst *sdi)
{
	struct sr_serial_dev_inst *serial;

	serial = sdi->conn;
	if (serial_open(serial, SERIAL_RDWR) != SR_OK)
		return SR_ERR;

	sdi->status = SR_ST_ACTIVE;

	return SR_OK;
}

/**
 * Standard serial driver dev_close() helper.
 *
 * This function can be used to implement the dev_close() driver API
 * callback in drivers that use a serial port.
 *
 * After closing the port, the status field of the given sdi is set
 * to SR_ST_INACTIVE.
 *
 * @retval SR_OK Success.
 */
SR_PRIV int std_serial_dev_close(struct sr_dev_inst *sdi)
{
	struct sr_serial_dev_inst *serial;

	serial = sdi->conn;
	if (serial && sdi->status == SR_ST_ACTIVE) {
		serial_close(serial);
		sdi->status = SR_ST_INACTIVE;
	}

	return SR_OK;
}

/**
 * Standard sr_session_stop() API helper.
 *
 * This function can be used to simplify most (serial port based) driver's
 * dev_acquisition_stop() API callback.
 *
 * @param sdi The device instance for which acquisition should stop.
 *            Must not be NULL.
 * @param cb_data Opaque 'cb_data' pointer. Must not be NULL.
 * @param dev_close_fn Function pointer to the driver's dev_close().
 *               	  Must not be NULL.
 * @param serial The serial device instance (struct serial_dev_inst *).
 *               Must not be NULL.
 * @param[in] prefix A driver-specific prefix string used for log messages.
 *               Must not be NULL. An empty string is allowed.
 *
 * @retval SR_OK Success.
 * @retval SR_ERR_ARG Invalid arguments.
 * @retval SR_ERR_DEV_CLOSED Device is closed.
 * @retval SR_ERR Other errors.
 */
SR_PRIV int std_serial_dev_acquisition_stop(struct sr_dev_inst *sdi,
			void *cb_data, dev_close_callback dev_close_fn,
			struct sr_serial_dev_inst *serial, const char *prefix)
{
	int ret;
	struct sr_datafeed_packet packet;

	if (!prefix) {
		sr_err("Invalid prefix.");
		return SR_ERR_ARG;
	}

	if (sdi->status != SR_ST_ACTIVE) {
		sr_err("%s: Device inactive, can't stop acquisition.", prefix);
		return SR_ERR_DEV_CLOSED;
	}

	sr_dbg("%s: Stopping acquisition.", prefix);

	if ((ret = serial_source_remove(sdi->session, serial)) < 0) {
		sr_err("%s: Failed to remove source: %d.", prefix, ret);
		return ret;
	}

	if ((ret = dev_close_fn(sdi)) < 0) {
		sr_err("%s: Failed to close device: %d.", prefix, ret);
		return ret;
	}

	/* Send SR_DF_END packet to the session bus. */
	sr_dbg("%s: Sending SR_DF_END packet.", prefix);
	packet.type = SR_DF_END;
	packet.payload = NULL;
	if ((ret = sr_session_send(cb_data, &packet)) < 0) {
		sr_err("%s: Failed to send SR_DF_END packet: %d.", prefix, ret);
		return ret;
	}

	return SR_OK;
}

#endif

/**
 * Standard driver dev_clear() helper.
 *
 * Clear driver, this means, close all instances.
 *
 * This function can be used to implement the dev_clear() driver API
 * callback. dev_close() is called before every sr_dev_inst is cleared.
 *
 * The only limitation is driver-specific device contexts (sdi->priv).
 * These are freed, but any dynamic allocation within structs stored
 * there cannot be freed.
 *
 * @param driver The driver which will have its instances released.
 * @param clear_private If not NULL, this points to a function called
 * with sdi->priv as argument. The function can then clear any device
 * instance-specific resources kept there. It must also clear the struct
 * pointed to by sdi->priv.
 *
 * @return SR_OK on success.
 */
SR_PRIV int std_dev_clear(const struct sr_dev_driver *driver,
		std_dev_clear_callback clear_private)
{
	struct drv_context *drvc;
	struct sr_dev_inst *sdi;
	GSList *l;
	int ret;

	if (!(drvc = driver->context))
		/* Driver was never initialized, nothing to do. */
		return SR_OK;

	ret = SR_OK;
	for (l = drvc->instances; l; l = l->next) {
		if (!(sdi = l->data)) {
			ret = SR_ERR_BUG;
			continue;
		}
		if (driver->dev_close)
			driver->dev_close(sdi);

		if (sdi->conn) {
#ifdef HAVE_LIBSERIALPORT
			if (sdi->inst_type == SR_INST_SERIAL)
				sr_serial_dev_inst_free(sdi->conn);
#endif
#ifdef HAVE_LIBUSB_1_0
			if (sdi->inst_type == SR_INST_USB)
				sr_usb_dev_inst_free(sdi->conn);
#endif
			if (sdi->inst_type == SR_INST_SCPI)
				sr_scpi_free(sdi->conn);
			if (sdi->inst_type == SR_INST_MODBUS)
				sr_modbus_free(sdi->conn);
		}
		if (clear_private)
			/* The helper function is responsible for freeing
			 * its own sdi->priv! */
			clear_private(sdi->priv);
		else
			g_free(sdi->priv);

		sr_dev_inst_free(sdi);
	}

	g_slist_free(drvc->instances);
	drvc->instances = NULL;

	return ret;
}
Commit	Line	Data
063e7aef	1	/*
50985c20	2	* This file is part of the libsigrok project.
063e7aef UH	3	*
	4	* Copyright (C) 2013 Uwe Hermann <uwe@hermann-uwe.de>
	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 2 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, write to the Free Software
	18	* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
	19	*/
	20
2eb84c98	21	/** @file
04cb9157 MH	22	* Standard API helper functions.
	23	* @internal
	24	*/
	25
6ec6c43b	26	#include <config.h>
063e7aef	27	#include <glib.h>
c1aae900	28	#include <libsigrok/libsigrok.h>
063e7aef	29	#include "libsigrok-internal.h"
5a1afc09	30	#include "scpi.h"
063e7aef	31
3544f848 ML	32	#define LOG_PREFIX "std"
3544f848 ML	33
063e7aef UH	34	/**
	35	* Standard sr_driver_init() API helper.
	36	*
6078d2c9	37	* This function can be used to simplify most driver's init() API callback.
063e7aef UH	38	*
	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.
	41	*
	42	* @param sr_ctx The libsigrok context to assign.
	43	* @param di The driver instance to use.
04cb9157	44	* @param[in] prefix A driver-specific prefix string used for log messages.
063e7aef	45	*
91219afc	46	* @return SR_OK upon success, SR_ERR_ARG upon invalid arguments.
063e7aef	47	*/
f6beaac5 UH	48	SR_PRIV int std_init(struct sr_context sr_ctx, struct sr_dev_driver di,
f6beaac5 UH	49	const char *prefix)
063e7aef UH	50	{
	51	struct drv_context *drvc;
	52
	53	if (!di) {
ac2926b3	54	sr_err("%s: Invalid driver, cannot initialize.", prefix);
063e7aef UH	55	return SR_ERR_ARG;
	56	}
	57
91219afc	58	drvc = g_malloc0(sizeof(struct drv_context));
063e7aef	59	drvc->sr_ctx = sr_ctx;
c2523f22	60	drvc->instances = NULL;
41812aca	61	di->context = drvc;
063e7aef UH	62
	63	return SR_OK;
	64	}
4afdfd46 UH	65
	66	/**
	67	* Standard API helper for sending an SR_DF_HEADER packet.
	68	*
	69	* This function can be used to simplify most driver's
6078d2c9	70	* dev_acquisition_start() API callback.
4afdfd46 UH	71	*
	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.
	75	*
	76	* @return SR_OK upon success, SR_ERR_ARG upon invalid arguments, or
	77	* SR_ERR upon other errors.
	78	*/
	79	SR_PRIV int std_session_send_df_header(const struct sr_dev_inst *sdi,
	80	const char *prefix)
	81	{
	82	int ret;
	83	struct sr_datafeed_packet packet;
	84	struct sr_datafeed_header header;
	85
	86	if (!prefix) {
	87	sr_err("Invalid prefix.");
	88	return SR_ERR_ARG;
	89	}
	90
ac2926b3	91	sr_dbg("%s: Starting acquisition.", prefix);
4afdfd46 UH	92
4afdfd46 UH	93	/* Send header packet to the session bus. */
ac2926b3	94	sr_dbg("%s: Sending SR_DF_HEADER packet.", prefix);
4afdfd46 UH	95	packet.type = SR_DF_HEADER;
	96	packet.payload = (uint8_t *)&header;
	97	header.feed_version = 1;
	98	gettimeofday(&header.starttime, NULL);
	99
	100	if ((ret = sr_session_send(sdi, &packet)) < 0) {
ac2926b3	101	sr_err("%s: Failed to send header packet: %d.", prefix, ret);
4afdfd46 UH	102	return ret;
	103	}
	104
	105	return SR_OK;
	106	}
cd2f0fe2	107
c4f2dfd0 UH	108	#ifdef HAVE_LIBSERIALPORT
c4f2dfd0 UH	109
813aab69	110	/**
23dc6661 BV	111	* Standard serial driver dev_open() helper.
	112	*
	113	* This function can be used to implement the dev_open() driver API
	114	* callback in drivers that use a serial port. The port is opened
6c592ece	115	* with the SERIAL_RDWR flag.
23dc6661 BV	116	*
	117	* If the open succeeded, the status field of the given sdi is set
	118	* to SR_ST_ACTIVE.
	119	*
	120	* @retval SR_OK Success.
	121	* @retval SR_ERR Serial port open failed.
	122	*/
	123	SR_PRIV int std_serial_dev_open(struct sr_dev_inst *sdi)
	124	{
	125	struct sr_serial_dev_inst *serial;
	126
	127	serial = sdi->conn;
6c592ece	128	if (serial_open(serial, SERIAL_RDWR) != SR_OK)
23dc6661 BV	129	return SR_ERR;
	130
	131	sdi->status = SR_ST_ACTIVE;
	132
	133	return SR_OK;
	134	}
	135
813aab69	136	/**
1e7134dc BV	137	* Standard serial driver dev_close() helper.
	138	*
	139	* This function can be used to implement the dev_close() driver API
	140	* callback in drivers that use a serial port.
	141	*
	142	* After closing the port, the status field of the given sdi is set
	143	* to SR_ST_INACTIVE.
	144	*
	145	* @retval SR_OK Success.
	146	*/
	147	SR_PRIV int std_serial_dev_close(struct sr_dev_inst *sdi)
	148	{
	149	struct sr_serial_dev_inst *serial;
	150
	151	serial = sdi->conn;
	152	if (serial && sdi->status == SR_ST_ACTIVE) {
	153	serial_close(serial);
	154	sdi->status = SR_ST_INACTIVE;
	155	}
	156
	157	return SR_OK;
	158	}
	159
813aab69	160	/**
cd2f0fe2 UH	161	* Standard sr_session_stop() API helper.
	162	*
	163	* This function can be used to simplify most (serial port based) driver's
6078d2c9	164	* dev_acquisition_stop() API callback.
cd2f0fe2 UH	165	*
	166	* @param sdi The device instance for which acquisition should stop.
	167	* Must not be NULL.
	168	* @param cb_data Opaque 'cb_data' pointer. Must not be NULL.
6078d2c9	169	* @param dev_close_fn Function pointer to the driver's dev_close().
cd2f0fe2 UH	170	* Must not be NULL.
	171	* @param serial The serial device instance (struct serial_dev_inst *).
	172	* Must not be NULL.
813aab69	173	* @param[in] prefix A driver-specific prefix string used for log messages.
cd2f0fe2 UH	174	* Must not be NULL. An empty string is allowed.
cd2f0fe2 UH	175	*
1477a9a6 MH	176	* @retval SR_OK Success.
	177	* @retval SR_ERR_ARG Invalid arguments.
	178	* @retval SR_ERR_DEV_CLOSED Device is closed.
	179	* @retval SR_ERR Other errors.
cd2f0fe2	180	*/
d43b0908	181	SR_PRIV int std_serial_dev_acquisition_stop(struct sr_dev_inst *sdi,
144f6660	182	void *cb_data, dev_close_callback dev_close_fn,
cd2f0fe2 UH	183	struct sr_serial_dev_inst serial, const char prefix)
	184	{
	185	int ret;
	186	struct sr_datafeed_packet packet;
	187
	188	if (!prefix) {
	189	sr_err("Invalid prefix.");
	190	return SR_ERR_ARG;
	191	}
	192
	193	if (sdi->status != SR_ST_ACTIVE) {
ac2926b3	194	sr_err("%s: Device inactive, can't stop acquisition.", prefix);
1477a9a6	195	return SR_ERR_DEV_CLOSED;
cd2f0fe2 UH	196	}
cd2f0fe2 UH	197
ac2926b3	198	sr_dbg("%s: Stopping acquisition.", prefix);
cd2f0fe2	199
102f1239	200	if ((ret = serial_source_remove(sdi->session, serial)) < 0) {
ac2926b3	201	sr_err("%s: Failed to remove source: %d.", prefix, ret);
cd2f0fe2 UH	202	return ret;
	203	}
	204
6078d2c9	205	if ((ret = dev_close_fn(sdi)) < 0) {
ac2926b3	206	sr_err("%s: Failed to close device: %d.", prefix, ret);
cd2f0fe2 UH	207	return ret;
	208	}
	209
	210	/* Send SR_DF_END packet to the session bus. */
ac2926b3	211	sr_dbg("%s: Sending SR_DF_END packet.", prefix);
cd2f0fe2 UH	212	packet.type = SR_DF_END;
	213	packet.payload = NULL;
	214	if ((ret = sr_session_send(cb_data, &packet)) < 0) {
ac2926b3	215	sr_err("%s: Failed to send SR_DF_END packet: %d.", prefix, ret);
cd2f0fe2 UH	216	return ret;
	217	}
	218
	219	return SR_OK;
	220	}
49f00e13	221
c4f2dfd0 UH	222	#endif
c4f2dfd0 UH	223
813aab69	224	/**
49f00e13 BV	225	* Standard driver dev_clear() helper.
49f00e13 BV	226	*
813aab69 MH	227	* Clear driver, this means, close all instances.
813aab69 MH	228	*
49f00e13 BV	229	* This function can be used to implement the dev_clear() driver API
	230	* callback. dev_close() is called before every sr_dev_inst is cleared.
	231	*
	232	* The only limitation is driver-specific device contexts (sdi->priv).
	233	* These are freed, but any dynamic allocation within structs stored
	234	* there cannot be freed.
	235	*
	236	* @param driver The driver which will have its instances released.
12a33563 BV	237	* @param clear_private If not NULL, this points to a function called
	238	* with sdi->priv as argument. The function can then clear any device
	239	* instance-specific resources kept there. It must also clear the struct
	240	* pointed to by sdi->priv.
49f00e13 BV	241	*
	242	* @return SR_OK on success.
	243	*/
ae5859ff	244	SR_PRIV int std_dev_clear(const struct sr_dev_driver *driver,
144f6660	245	std_dev_clear_callback clear_private)
49f00e13	246	{
49f00e13	247	struct drv_context *drvc;
12a33563	248	struct sr_dev_inst *sdi;
7aebe22d	249	GSList *l;
49f00e13 BV	250	int ret;
49f00e13 BV	251
41812aca	252	if (!(drvc = driver->context))
3a277f3b BV	253	/* Driver was never initialized, nothing to do. */
	254	return SR_OK;
	255
49f00e13 BV	256	ret = SR_OK;
49f00e13 BV	257	for (l = drvc->instances; l; l = l->next) {
49f00e13 BV	258	if (!(sdi = l->data)) {
	259	ret = SR_ERR_BUG;
	260	continue;
	261	}
49f00e13 BV	262	if (driver->dev_close)
	263	driver->dev_close(sdi);
	264
	265	if (sdi->conn) {
45357ce6	266	#ifdef HAVE_LIBSERIALPORT
c4f2dfd0	267	if (sdi->inst_type == SR_INST_SERIAL)
12a33563	268	sr_serial_dev_inst_free(sdi->conn);
c4f2dfd0	269	#endif
45357ce6	270	#ifdef HAVE_LIBUSB_1_0
c4f2dfd0	271	if (sdi->inst_type == SR_INST_USB)
49f00e13	272	sr_usb_dev_inst_free(sdi->conn);
a0c7e23a	273	#endif
23f43dff ML	274	if (sdi->inst_type == SR_INST_SCPI)
23f43dff ML	275	sr_scpi_free(sdi->conn);
daa39012 AJ	276	if (sdi->inst_type == SR_INST_MODBUS)
daa39012 AJ	277	sr_modbus_free(sdi->conn);
49f00e13	278	}
ae5859ff	279	if (clear_private)
886413b6 BV	280	/* The helper function is responsible for freeing
886413b6 BV	281	* its own sdi->priv! */
ae5859ff	282	clear_private(sdi->priv);
12a33563 BV	283	else
12a33563 BV	284	g_free(sdi->priv);
886413b6	285
49f00e13 BV	286	sr_dev_inst_free(sdi);
	287	}
	288
	289	g_slist_free(drvc->instances);
	290	drvc->instances = NULL;
	291
	292	return ret;
	293	}