[libsigrok.git] / session_driver.c

/*
 * This file is part of the sigrok project.
 *
 * Copyright (C) 2010-2012 Bert Vermeulen <bert@biot.com>
 *
 * 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 <http://www.gnu.org/licenses/>.
 */

#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/time.h>
#include <zip.h>
#include "libsigrok.h"
#include "libsigrok-internal.h"

/* Message logging helpers with driver-specific prefix string. */
#define DRIVER_LOG_DOMAIN "virtual-session: "
#define sr_log(l, s, args...) sr_log(l, DRIVER_LOG_DOMAIN s, ## args)
#define sr_spew(s, args...) sr_spew(DRIVER_LOG_DOMAIN s, ## args)
#define sr_dbg(s, args...) sr_dbg(DRIVER_LOG_DOMAIN s, ## args)
#define sr_info(s, args...) sr_info(DRIVER_LOG_DOMAIN s, ## args)
#define sr_warn(s, args...) sr_warn(DRIVER_LOG_DOMAIN s, ## args)
#define sr_err(s, args...) sr_err(DRIVER_LOG_DOMAIN s, ## args)

/* size of payloads sent across the session bus */
/** @cond PRIVATE */
#define CHUNKSIZE (512 * 1024)
/** @endcond */

struct session_vdev {
	char *sessionfile;
	char *capturefile;
	struct zip *archive;
	struct zip_file *capfile;
	int bytes_read;
	uint64_t samplerate;
	int unitsize;
	int num_probes;
};

static GSList *dev_insts = NULL;
static const int hwcaps[] = {
	SR_HWCAP_CAPTUREFILE,
	SR_HWCAP_CAPTURE_UNITSIZE,
	0,
};

static int receive_data(int fd, int revents, void *cb_data)
{
	struct sr_dev_inst *sdi;
	struct session_vdev *vdev;
	struct sr_datafeed_packet packet;
	struct sr_datafeed_logic logic;
	GSList *l;
	void *buf;
	int ret, got_data;

	(void)fd;
	(void)revents;

	sr_dbg("Feed chunk.");

	got_data = FALSE;
	for (l = dev_insts; l; l = l->next) {
		sdi = l->data;
		vdev = sdi->priv;
		if (!vdev)
			/* already done with this instance */
			continue;

		if (!(buf = g_try_malloc(CHUNKSIZE))) {
			sr_err("%s: buf malloc failed", __func__);
			return FALSE;
		}

		ret = zip_fread(vdev->capfile, buf, CHUNKSIZE);
		if (ret > 0) {
			got_data = TRUE;
			packet.type = SR_DF_LOGIC;
			packet.payload = &logic;
			logic.length = ret;
			logic.unitsize = vdev->unitsize;
			logic.data = buf;
			vdev->bytes_read += ret;
			sr_session_send(cb_data, &packet);
		} else {
			/* done with this capture file */
			zip_fclose(vdev->capfile);
			g_free(vdev->capturefile);
			g_free(vdev);
			sdi->priv = NULL;
		}
	}

	if (!got_data) {
		packet.type = SR_DF_END;
		sr_session_send(cb_data, &packet);
		sr_session_source_remove(-1);
	}

	return TRUE;
}

/* driver callbacks */
static int hw_cleanup(void);

static int hw_init(struct sr_context *sr_ctx)
{
	(void)sr_ctx;

	return SR_OK;
}

static int hw_cleanup(void)
{
	GSList *l;

	for (l = dev_insts; l; l = l->next)
		sr_dev_inst_free(l->data);
	g_slist_free(dev_insts);
	dev_insts = NULL;

	return SR_OK;
}

static int hw_dev_open(struct sr_dev_inst *sdi)
{
	if (!(sdi->priv = g_try_malloc0(sizeof(struct session_vdev)))) {
		sr_err("%s: sdi->priv malloc failed", __func__);
		return SR_ERR_MALLOC;
	}

	dev_insts = g_slist_append(dev_insts, sdi);

	return SR_OK;
}

static int hw_info_get(int info_id, const void **data,
       const struct sr_dev_inst *sdi)
{
	struct session_vdev *vdev;

	switch (info_id) {
	case SR_DI_HWCAPS:
		*data = hwcaps;
		break;
	case SR_DI_CUR_SAMPLERATE:
		if (sdi) {
			vdev = sdi->priv;
			*data = &vdev->samplerate;
		} else
			return SR_ERR;
		break;
	default:
		return SR_ERR_ARG;
	}

	return SR_OK;
}

static int hw_dev_config_set(const struct sr_dev_inst *sdi, int hwcap,
		const void *value)
{
	struct session_vdev *vdev;
	const uint64_t *tmp_u64;

	vdev = sdi->priv;

	switch (hwcap) {
	case SR_HWCAP_SAMPLERATE:
		tmp_u64 = value;
		vdev->samplerate = *tmp_u64;
		sr_info("Setting samplerate to %" PRIu64 ".", vdev->samplerate);
		break;
	case SR_HWCAP_SESSIONFILE:
		vdev->sessionfile = g_strdup(value);
		sr_info("Setting sessionfile to '%s'.", vdev->sessionfile);
		break;
	case SR_HWCAP_CAPTUREFILE:
		vdev->capturefile = g_strdup(value);
		sr_info("Setting capturefile to '%s'.", vdev->capturefile);
		break;
	case SR_HWCAP_CAPTURE_UNITSIZE:
		tmp_u64 = value;
		vdev->unitsize = *tmp_u64;
		break;
	case SR_HWCAP_CAPTURE_NUM_PROBES:
		tmp_u64 = value;
		vdev->num_probes = *tmp_u64;
		break;
	default:
		sr_err("Unknown capability: %d.", hwcap);
		return SR_ERR;
	}

	return SR_OK;
}

static int hw_dev_acquisition_start(const struct sr_dev_inst *sdi,
		void *cb_data)
{
	struct zip_stat zs;
	struct session_vdev *vdev;
	struct sr_datafeed_header *header;
	struct sr_datafeed_packet *packet;
	struct sr_datafeed_meta_logic meta;
	int ret;

	vdev = sdi->priv;

	sr_info("Opening archive %s file %s", vdev->sessionfile,
		vdev->capturefile);

	if (!(vdev->archive = zip_open(vdev->sessionfile, 0, &ret))) {
		sr_err("Failed to open session file '%s': "
		       "zip error %d\n", vdev->sessionfile, ret);
		return SR_ERR;
	}

	if (zip_stat(vdev->archive, vdev->capturefile, 0, &zs) == -1) {
		sr_err("Failed to check capture file '%s' in "
		       "session file '%s'.", vdev->capturefile, vdev->sessionfile);
		return SR_ERR;
	}

	if (!(vdev->capfile = zip_fopen(vdev->archive, vdev->capturefile, 0))) {
		sr_err("Failed to open capture file '%s' in "
		       "session file '%s'.", vdev->capturefile, vdev->sessionfile);
		return SR_ERR;
	}

	/* freewheeling source */
	sr_session_source_add(-1, 0, 0, receive_data, cb_data);

	if (!(packet = g_try_malloc(sizeof(struct sr_datafeed_packet)))) {
		sr_err("%s: packet malloc failed", __func__);
		return SR_ERR_MALLOC;
	}

	if (!(header = g_try_malloc(sizeof(struct sr_datafeed_header)))) {
		sr_err("%s: header malloc failed", __func__);
		return SR_ERR_MALLOC;
	}

	/* Send header packet to the session bus. */
	packet->type = SR_DF_HEADER;
	packet->payload = (unsigned char *)header;
	header->feed_version = 1;
	gettimeofday(&header->starttime, NULL);
	sr_session_send(cb_data, packet);

	/* Send metadata about the SR_DF_LOGIC packets to come. */
	packet->type = SR_DF_META_LOGIC;
	packet->payload = &meta;
	meta.samplerate = vdev->samplerate;
	meta.num_probes = vdev->num_probes;
	sr_session_send(cb_data, packet);

	g_free(header);
	g_free(packet);

	return SR_OK;
}

/** @private */
SR_PRIV struct sr_dev_driver session_driver = {
	.name = "virtual-session",
	.longname = "Session-emulating driver",
	.api_version = 1,
	.init = hw_init,
	.cleanup = hw_cleanup,
	.dev_open = hw_dev_open,
	.dev_close = NULL,
	.info_get = hw_info_get,
	.dev_config_set = hw_dev_config_set,
	.dev_acquisition_start = hw_dev_acquisition_start,
	.dev_acquisition_stop = NULL,
};
Commit	Line	Data
	1	/*
	2	* This file is part of the sigrok project.
	3	*
	4	* Copyright (C) 2010-2012 Bert Vermeulen <bert@biot.com>
	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 3 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, see <http://www.gnu.org/licenses/>.
	18	*/
	19
	20	#include <sys/types.h>
	21	#include <sys/stat.h>
	22	#include <fcntl.h>
	23	#include <unistd.h>
	24	#include <sys/time.h>
	25	#include <zip.h>
	26	#include "libsigrok.h"
	27	#include "libsigrok-internal.h"
	28
	29	/* Message logging helpers with driver-specific prefix string. */
	30	#define DRIVER_LOG_DOMAIN "virtual-session: "
	31	#define sr_log(l, s, args...) sr_log(l, DRIVER_LOG_DOMAIN s, ## args)
	32	#define sr_spew(s, args...) sr_spew(DRIVER_LOG_DOMAIN s, ## args)
	33	#define sr_dbg(s, args...) sr_dbg(DRIVER_LOG_DOMAIN s, ## args)
	34	#define sr_info(s, args...) sr_info(DRIVER_LOG_DOMAIN s, ## args)
	35	#define sr_warn(s, args...) sr_warn(DRIVER_LOG_DOMAIN s, ## args)
	36	#define sr_err(s, args...) sr_err(DRIVER_LOG_DOMAIN s, ## args)
	37
	38	/* size of payloads sent across the session bus */
	39	/** @cond PRIVATE */
	40	#define CHUNKSIZE (512 * 1024)
	41	/** @endcond */
	42
	43	struct session_vdev {
	44	char *sessionfile;
	45	char *capturefile;
	46	struct zip *archive;
	47	struct zip_file *capfile;
	48	int bytes_read;
	49	uint64_t samplerate;
	50	int unitsize;
	51	int num_probes;
	52	};
	53
	54	static GSList *dev_insts = NULL;
	55	static const int hwcaps[] = {
	56	SR_HWCAP_CAPTUREFILE,
	57	SR_HWCAP_CAPTURE_UNITSIZE,
	58	0,
	59	};
	60
	61	static int receive_data(int fd, int revents, void *cb_data)
	62	{
	63	struct sr_dev_inst *sdi;
	64	struct session_vdev *vdev;
	65	struct sr_datafeed_packet packet;
	66	struct sr_datafeed_logic logic;
	67	GSList *l;
	68	void *buf;
	69	int ret, got_data;
	70
	71	(void)fd;
	72	(void)revents;
	73
	74	sr_dbg("Feed chunk.");
	75
	76	got_data = FALSE;
	77	for (l = dev_insts; l; l = l->next) {
	78	sdi = l->data;
	79	vdev = sdi->priv;
	80	if (!vdev)
	81	/* already done with this instance */
	82	continue;
	83
	84	if (!(buf = g_try_malloc(CHUNKSIZE))) {
	85	sr_err("%s: buf malloc failed", __func__);
	86	return FALSE;
	87	}
	88
	89	ret = zip_fread(vdev->capfile, buf, CHUNKSIZE);
	90	if (ret > 0) {
	91	got_data = TRUE;
	92	packet.type = SR_DF_LOGIC;
	93	packet.payload = &logic;
	94	logic.length = ret;
	95	logic.unitsize = vdev->unitsize;
	96	logic.data = buf;
	97	vdev->bytes_read += ret;
	98	sr_session_send(cb_data, &packet);
	99	} else {
	100	/* done with this capture file */
	101	zip_fclose(vdev->capfile);
	102	g_free(vdev->capturefile);
	103	g_free(vdev);
	104	sdi->priv = NULL;
	105	}
	106	}
	107
	108	if (!got_data) {
	109	packet.type = SR_DF_END;
	110	sr_session_send(cb_data, &packet);
	111	sr_session_source_remove(-1);
	112	}
	113
	114	return TRUE;
	115	}
	116
	117	/* driver callbacks */
	118	static int hw_cleanup(void);
	119
	120	static int hw_init(struct sr_context *sr_ctx)
	121	{
	122	(void)sr_ctx;
	123
	124	return SR_OK;
	125	}
	126
	127	static int hw_cleanup(void)
	128	{
	129	GSList *l;
	130
	131	for (l = dev_insts; l; l = l->next)
	132	sr_dev_inst_free(l->data);
	133	g_slist_free(dev_insts);
	134	dev_insts = NULL;
	135
	136	return SR_OK;
	137	}
	138
	139	static int hw_dev_open(struct sr_dev_inst *sdi)
	140	{
	141	if (!(sdi->priv = g_try_malloc0(sizeof(struct session_vdev)))) {
	142	sr_err("%s: sdi->priv malloc failed", __func__);
	143	return SR_ERR_MALLOC;
	144	}
	145
	146	dev_insts = g_slist_append(dev_insts, sdi);
	147
	148	return SR_OK;
	149	}
	150
	151	static int hw_info_get(int info_id, const void **data,
	152	const struct sr_dev_inst *sdi)
	153	{
	154	struct session_vdev *vdev;
	155
	156	switch (info_id) {
	157	case SR_DI_HWCAPS:
	158	*data = hwcaps;
	159	break;
	160	case SR_DI_CUR_SAMPLERATE:
	161	if (sdi) {
	162	vdev = sdi->priv;
	163	*data = &vdev->samplerate;
	164	} else
	165	return SR_ERR;
	166	break;
	167	default:
	168	return SR_ERR_ARG;
	169	}
	170
	171	return SR_OK;
	172	}
	173
	174	static int hw_dev_config_set(const struct sr_dev_inst *sdi, int hwcap,
	175	const void *value)
	176	{
	177	struct session_vdev *vdev;
	178	const uint64_t *tmp_u64;
	179
	180	vdev = sdi->priv;
	181
	182	switch (hwcap) {
	183	case SR_HWCAP_SAMPLERATE:
	184	tmp_u64 = value;
	185	vdev->samplerate = *tmp_u64;
	186	sr_info("Setting samplerate to %" PRIu64 ".", vdev->samplerate);
	187	break;
	188	case SR_HWCAP_SESSIONFILE:
	189	vdev->sessionfile = g_strdup(value);
	190	sr_info("Setting sessionfile to '%s'.", vdev->sessionfile);
	191	break;
	192	case SR_HWCAP_CAPTUREFILE:
	193	vdev->capturefile = g_strdup(value);
	194	sr_info("Setting capturefile to '%s'.", vdev->capturefile);
	195	break;
	196	case SR_HWCAP_CAPTURE_UNITSIZE:
	197	tmp_u64 = value;
	198	vdev->unitsize = *tmp_u64;
	199	break;
	200	case SR_HWCAP_CAPTURE_NUM_PROBES:
	201	tmp_u64 = value;
	202	vdev->num_probes = *tmp_u64;
	203	break;
	204	default:
	205	sr_err("Unknown capability: %d.", hwcap);
	206	return SR_ERR;
	207	}
	208
	209	return SR_OK;
	210	}
	211
	212	static int hw_dev_acquisition_start(const struct sr_dev_inst *sdi,
	213	void *cb_data)
	214	{
	215	struct zip_stat zs;
	216	struct session_vdev *vdev;
	217	struct sr_datafeed_header *header;
	218	struct sr_datafeed_packet *packet;
	219	struct sr_datafeed_meta_logic meta;
	220	int ret;
	221
	222	vdev = sdi->priv;
	223
	224	sr_info("Opening archive %s file %s", vdev->sessionfile,
	225	vdev->capturefile);
	226
	227	if (!(vdev->archive = zip_open(vdev->sessionfile, 0, &ret))) {
	228	sr_err("Failed to open session file '%s': "
	229	"zip error %d\n", vdev->sessionfile, ret);
	230	return SR_ERR;
	231	}
	232
	233	if (zip_stat(vdev->archive, vdev->capturefile, 0, &zs) == -1) {
	234	sr_err("Failed to check capture file '%s' in "
	235	"session file '%s'.", vdev->capturefile, vdev->sessionfile);
	236	return SR_ERR;
	237	}
	238
	239	if (!(vdev->capfile = zip_fopen(vdev->archive, vdev->capturefile, 0))) {
	240	sr_err("Failed to open capture file '%s' in "
	241	"session file '%s'.", vdev->capturefile, vdev->sessionfile);
	242	return SR_ERR;
	243	}
	244
	245	/* freewheeling source */
	246	sr_session_source_add(-1, 0, 0, receive_data, cb_data);
	247
	248	if (!(packet = g_try_malloc(sizeof(struct sr_datafeed_packet)))) {
	249	sr_err("%s: packet malloc failed", __func__);
	250	return SR_ERR_MALLOC;
	251	}
	252
	253	if (!(header = g_try_malloc(sizeof(struct sr_datafeed_header)))) {
	254	sr_err("%s: header malloc failed", __func__);
	255	return SR_ERR_MALLOC;
	256	}
	257
	258	/* Send header packet to the session bus. */
	259	packet->type = SR_DF_HEADER;
	260	packet->payload = (unsigned char *)header;
	261	header->feed_version = 1;
	262	gettimeofday(&header->starttime, NULL);
	263	sr_session_send(cb_data, packet);
	264
	265	/* Send metadata about the SR_DF_LOGIC packets to come. */
	266	packet->type = SR_DF_META_LOGIC;
	267	packet->payload = &meta;
	268	meta.samplerate = vdev->samplerate;
	269	meta.num_probes = vdev->num_probes;
	270	sr_session_send(cb_data, packet);
	271
	272	g_free(header);
	273	g_free(packet);
	274
	275	return SR_OK;
	276	}
	277
	278	/** @private */
	279	SR_PRIV struct sr_dev_driver session_driver = {
	280	.name = "virtual-session",
	281	.longname = "Session-emulating driver",
	282	.api_version = 1,
	283	.init = hw_init,
	284	.cleanup = hw_cleanup,
	285	.dev_open = hw_dev_open,
	286	.dev_close = NULL,
	287	.info_get = hw_info_get,
	288	.dev_config_set = hw_dev_config_set,
	289	.dev_acquisition_start = hw_dev_acquisition_start,
	290	.dev_acquisition_stop = NULL,
	291	};