[libsigrok.git] / hardware / demo / demo.c

/*
 * This file is part of the sigrok project.
 *
 * Copyright (C) 2010 Uwe Hermann <uwe@hermann-uwe.de>
 * Copyright (C) 2011 Olivier Fauchon <olivier@aixmarseille.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 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
 */

#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#ifdef _WIN32
#include <io.h>
#include <fcntl.h>
#define pipe(fds) _pipe(fds, 4096, _O_BINARY)
#endif
#include "libsigrok.h"
#include "libsigrok-internal.h"

/* TODO: Number of probes should be configurable. */
#define NUM_PROBES             8

#define DEMONAME               "Demo device"

/* The size of chunks to send through the session bus. */
/* TODO: Should be configurable. */
#define BUFSIZE                4096

/* Supported patterns which we can generate */
enum {
	/**
	 * Pattern which spells "sigrok" using '0's (with '1's as "background")
	 * when displayed using the 'bits' output format.
	 */
	PATTERN_SIGROK,

	/** Pattern which consists of (pseudo-)random values on all probes. */
	PATTERN_RANDOM,

	/**
	 * Pattern which consists of incrementing numbers.
	 * TODO: Better description.
	 */
	PATTERN_INC,

	/** Pattern where all probes have a low logic state. */
	PATTERN_ALL_LOW,

	/** Pattern where all probes have a high logic state. */
	PATTERN_ALL_HIGH,
};

/* FIXME: Should not be global. */

struct context {
	int pipe_fds[2];
	GIOChannel *channels[2];
	uint8_t sample_generator;
	uint8_t thread_running;
	uint64_t samples_counter;
	int dev_index;
	void *session_dev_id;
	GTimer *timer;
};

static const int hwcaps[] = {
	SR_HWCAP_LOGIC_ANALYZER,
	SR_HWCAP_DEMO_DEV,
	SR_HWCAP_SAMPLERATE,
	SR_HWCAP_PATTERN_MODE,
	SR_HWCAP_LIMIT_SAMPLES,
	SR_HWCAP_LIMIT_MSEC,
	SR_HWCAP_CONTINUOUS,
};

static const struct sr_samplerates samplerates = {
	SR_HZ(1),
	SR_GHZ(1),
	SR_HZ(1),
	NULL,
};

static const char *pattern_strings[] = {
	"sigrok",
	"random",
	"incremental",
	"all-low",
	"all-high",
	NULL,
};

/* We name the probes 0-7 on our demo driver. */
static const char *probe_names[NUM_PROBES + 1] = {
	"0",
	"1",
	"2",
	"3",
	"4",
	"5",
	"6",
	"7",
	NULL,
};

static uint8_t pattern_sigrok[] = {
	0x4c, 0x92, 0x92, 0x92, 0x64, 0x00, 0x00, 0x00,
	0x82, 0xfe, 0xfe, 0x82, 0x00, 0x00, 0x00, 0x00,
	0x7c, 0x82, 0x82, 0x92, 0x74, 0x00, 0x00, 0x00,
	0xfe, 0x12, 0x12, 0x32, 0xcc, 0x00, 0x00, 0x00,
	0x7c, 0x82, 0x82, 0x82, 0x7c, 0x00, 0x00, 0x00,
	0xfe, 0x10, 0x28, 0x44, 0x82, 0x00, 0x00, 0x00,
	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
	0xbe, 0xbe, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
};

/* Private, per-device-instance driver context. */
/* TODO: struct context as with the other drivers. */

/* List of struct sr_dev_inst, maintained by dev_open()/dev_close(). */
static GSList *dev_insts = NULL;
static uint64_t cur_samplerate = SR_KHZ(200);
static uint64_t limit_samples = 0;
static uint64_t limit_msec = 0;
static int default_pattern = PATTERN_SIGROK;
static GThread *my_thread;
static int thread_running;

static int hw_dev_acquisition_stop(int dev_index, void *cb_data);

static int hw_init(void)
{
	struct sr_dev_inst *sdi;

	sdi = sr_dev_inst_new(0, SR_ST_ACTIVE, DEMONAME, NULL, NULL);
	if (!sdi) {
		sr_err("demo: %s: sr_dev_inst_new failed", __func__);
		return 0;
	}

	dev_insts = g_slist_append(dev_insts, sdi);

	return 1;
}

static int hw_dev_open(int dev_index)
{
	/* Avoid compiler warnings. */
	(void)dev_index;

	/* Nothing needed so far. */

	return SR_OK;
}

static int hw_dev_close(int dev_index)
{
	/* Avoid compiler warnings. */
	(void)dev_index;

	/* Nothing needed so far. */

	return SR_OK;
}

static int hw_cleanup(void)
{
	/* Nothing needed so far. */
	return SR_OK;
}

static const void *hw_dev_info_get(int dev_index, int dev_info_id)
{
	struct sr_dev_inst *sdi;
	const void *info = NULL;

	if (!(sdi = sr_dev_inst_get(dev_insts, dev_index))) {
		sr_err("demo: %s: sdi was NULL", __func__);
		return NULL;
	}

	switch (dev_info_id) {
	case SR_DI_INST:
		info = sdi;
		break;
	case SR_DI_NUM_PROBES:
		info = GINT_TO_POINTER(NUM_PROBES);
		break;
	case SR_DI_PROBE_NAMES:
		info = probe_names;
		break;
	case SR_DI_SAMPLERATES:
		info = &samplerates;
		break;
	case SR_DI_CUR_SAMPLERATE:
		info = &cur_samplerate;
		break;
	case SR_DI_PATTERNS:
		info = &pattern_strings;
		break;
	}

	return info;
}

static int hw_dev_status_get(int dev_index)
{
	/* Avoid compiler warnings. */
	(void)dev_index;

	return SR_ST_ACTIVE;
}

static const int *hw_hwcap_get_all(void)
{
	return hwcaps;
}

static int hw_dev_config_set(int dev_index, int hwcap, const void *value)
{
	int ret;
	const char *stropt;

	/* Avoid compiler warnings. */
	(void)dev_index;

	if (hwcap == SR_HWCAP_PROBECONFIG) {
		/* Nothing to do, but must be supported */
		ret = SR_OK;
	} else if (hwcap == SR_HWCAP_SAMPLERATE) {
		cur_samplerate = *(const uint64_t *)value;
		sr_dbg("demo: %s: setting samplerate to %" PRIu64, __func__,
		       cur_samplerate);
		ret = SR_OK;
	} else if (hwcap == SR_HWCAP_LIMIT_SAMPLES) {
		limit_msec = 0;
		limit_samples = *(const uint64_t *)value;
		sr_dbg("demo: %s: setting limit_samples to %" PRIu64, __func__,
		       limit_samples);
		ret = SR_OK;
	} else if (hwcap == SR_HWCAP_LIMIT_MSEC) {
		limit_msec = *(const uint64_t *)value;
		limit_samples = 0;
		sr_dbg("demo: %s: setting limit_msec to %" PRIu64, __func__,
		       limit_msec);
		ret = SR_OK;
	} else if (hwcap == SR_HWCAP_PATTERN_MODE) {
		stropt = value;
		ret = SR_OK;
		if (!strcmp(stropt, "sigrok")) {
			default_pattern = PATTERN_SIGROK;
		} else if (!strcmp(stropt, "random")) {
			default_pattern = PATTERN_RANDOM;
		} else if (!strcmp(stropt, "incremental")) {
			default_pattern = PATTERN_INC;
		} else if (!strcmp(stropt, "all-low")) {
			default_pattern = PATTERN_ALL_LOW;
		} else if (!strcmp(stropt, "all-high")) {
			default_pattern = PATTERN_ALL_HIGH;
		} else {
			ret = SR_ERR;
		}
		sr_dbg("demo: %s: setting pattern to %d", __func__,
		       default_pattern);
	} else {
		ret = SR_ERR;
	}

	return ret;
}

static void samples_generator(uint8_t *buf, uint64_t size, void *data)
{
	static uint64_t p = 0;
	struct context *ctx = data;
	uint64_t i;

	/* TODO: Needed? */
	memset(buf, 0, size);

	switch (ctx->sample_generator) {
	case PATTERN_SIGROK: /* sigrok pattern */
		for (i = 0; i < size; i++) {
			*(buf + i) = ~(pattern_sigrok[p] >> 1);
			if (++p == 64)
				p = 0;
		}
		break;
	case PATTERN_RANDOM: /* Random */
		for (i = 0; i < size; i++)
			*(buf + i) = (uint8_t)(rand() & 0xff);
		break;
	case PATTERN_INC: /* Simple increment */
		for (i = 0; i < size; i++)
			*(buf + i) = i;
		break;
	case PATTERN_ALL_LOW: /* All probes are low */
		memset(buf, 0x00, size);
		break;
	case PATTERN_ALL_HIGH: /* All probes are high */
		memset(buf, 0xff, size);
		break;
	default:
		sr_err("demo: %s: unknown pattern %d", __func__,
		       ctx->sample_generator);
		break;
	}
}

/* Thread function */
static void thread_func(void *data)
{
	struct context *ctx = data;
	uint8_t buf[BUFSIZE];
	uint64_t nb_to_send = 0;
	int bytes_written;
	double time_cur, time_last, time_diff;

	time_last = g_timer_elapsed(ctx->timer, NULL);

	while (thread_running) {
		/* Rate control */
		time_cur = g_timer_elapsed(ctx->timer, NULL);

		time_diff = time_cur - time_last;
		time_last = time_cur;

		nb_to_send = cur_samplerate * time_diff;

		if (limit_samples) {
			nb_to_send = MIN(nb_to_send,
				      limit_samples - ctx->samples_counter);
		}

		/* Make sure we don't overflow. */
		nb_to_send = MIN(nb_to_send, BUFSIZE);

		if (nb_to_send) {
			samples_generator(buf, nb_to_send, data);
			ctx->samples_counter += nb_to_send;

			g_io_channel_write_chars(ctx->channels[1], (gchar *)&buf,
				nb_to_send, (gsize *)&bytes_written, NULL);
		}

		/* Check if we're done. */
		if ((limit_msec && time_cur * 1000 > limit_msec) ||
		    (limit_samples && ctx->samples_counter >= limit_samples))
		{
			close(ctx->pipe_fds[1]);
			thread_running = 0;
		}

		g_usleep(10);
	}
}

/* Callback handling data */
static int receive_data(int fd, int revents, void *cb_data)
{
	struct context *ctx = cb_data;
	struct sr_datafeed_packet packet;
	struct sr_datafeed_logic logic;
	static uint64_t samples_received = 0;
	unsigned char c[BUFSIZE];
	gsize z;

	/* Avoid compiler warnings. */
	(void)fd;
	(void)revents;

	do {
		g_io_channel_read_chars(ctx->channels[0],
				        (gchar *)&c, BUFSIZE, &z, NULL);

		if (z > 0) {
			packet.type = SR_DF_LOGIC;
			packet.payload = &logic;
			logic.length = z;
			logic.unitsize = 1;
			logic.data = c;
			sr_session_send(ctx->session_dev_id, &packet);
			samples_received += z;
		}
	} while (z > 0);

	if (!thread_running && z <= 0) {
		/* Make sure we don't receive more packets. */
		g_io_channel_shutdown(ctx->channels[0], FALSE, NULL);

		/* Send last packet. */
		packet.type = SR_DF_END;
		sr_session_send(ctx->session_dev_id, &packet);

		return FALSE;
	}

	return TRUE;
}

static int hw_dev_acquisition_start(int dev_index, void *cb_data)
{
	struct sr_datafeed_packet *packet;
	struct sr_datafeed_header *header;
	struct sr_datafeed_meta_logic meta;
	struct context *ctx;

	/* TODO: 'ctx' is never g_free()'d? */
	if (!(ctx = g_try_malloc(sizeof(struct context)))) {
		sr_err("demo: %s: ctx malloc failed", __func__);
		return SR_ERR_MALLOC;
	}

	ctx->sample_generator = default_pattern;
	ctx->session_dev_id = cb_data;
	ctx->dev_index = dev_index;
	ctx->samples_counter = 0;

	if (pipe(ctx->pipe_fds)) {
		/* TODO: Better error message. */
		sr_err("demo: %s: pipe() failed", __func__);
		return SR_ERR;
	}

	ctx->channels[0] = g_io_channel_unix_new(ctx->pipe_fds[0]);
	ctx->channels[1] = g_io_channel_unix_new(ctx->pipe_fds[1]);

	g_io_channel_set_flags(ctx->channels[0], G_IO_FLAG_NONBLOCK, NULL);

	/* Set channel encoding to binary (default is UTF-8). */
	g_io_channel_set_encoding(ctx->channels[0], NULL, NULL);
	g_io_channel_set_encoding(ctx->channels[1], NULL, NULL);

	/* Make channels to unbuffered. */
	g_io_channel_set_buffered(ctx->channels[0], FALSE);
	g_io_channel_set_buffered(ctx->channels[1], FALSE);

	sr_session_source_add_channel(ctx->channels[0], G_IO_IN | G_IO_ERR,
		    40, receive_data, ctx);

	/* Run the demo thread. */
	g_thread_init(NULL);
	/* This must to be done between g_thread_init() & g_thread_create(). */
	ctx->timer = g_timer_new();
	thread_running = 1;
	my_thread =
	    g_thread_create((GThreadFunc)thread_func, ctx, TRUE, NULL);
	if (!my_thread) {
		sr_err("demo: %s: g_thread_create failed", __func__);
		return SR_ERR; /* TODO */
	}

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

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

	packet->type = SR_DF_HEADER;
	packet->payload = header;
	header->feed_version = 1;
	gettimeofday(&header->starttime, NULL);
	sr_session_send(ctx->session_dev_id, packet);

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

	g_free(header);
	g_free(packet);

	return SR_OK;
}

/* TODO: This stops acquisition on ALL devices, ignoring dev_index. */
static int hw_dev_acquisition_stop(int dev_index, void *cb_data)
{
	/* Avoid compiler warnings. */
	(void)dev_index;
	(void)cb_data;

	/* Stop generate thread. */
	thread_running = 0;

	return SR_OK;
}

SR_PRIV struct sr_dev_driver demo_driver_info = {
	.name = "demo",
	.longname = "Demo driver and pattern generator",
	.api_version = 1,
	.init = hw_init,
	.cleanup = hw_cleanup,
	.dev_open = hw_dev_open,
	.dev_close = hw_dev_close,
	.dev_info_get = hw_dev_info_get,
	.dev_status_get = hw_dev_status_get,
	.hwcap_get_all = hw_hwcap_get_all,
	.dev_config_set = hw_dev_config_set,
	.dev_acquisition_start = hw_dev_acquisition_start,
	.dev_acquisition_stop = hw_dev_acquisition_stop,
};
Commit	Line	Data
	1	/*
	2	* This file is part of the sigrok project.
	3	*
	4	* Copyright (C) 2010 Uwe Hermann <uwe@hermann-uwe.de>
	5	* Copyright (C) 2011 Olivier Fauchon <olivier@aixmarseille.com>
	6	*
	7	* This program is free software; you can redistribute it and/or modify
	8	* it under the terms of the GNU General Public License as published by
	9	* the Free Software Foundation; either version 2 of the License, or
	10	* (at your option) any later version.
	11	*
	12	* This program is distributed in the hope that it will be useful,
	13	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	15	* GNU General Public License for more details.
	16	*
	17	* You should have received a copy of the GNU General Public License
	18	* along with this program; if not, write to the Free Software
	19	* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
	20	*/
	21
	22	#include <stdlib.h>
	23	#include <unistd.h>
	24	#include <string.h>
	25	#ifdef _WIN32
	26	#include <io.h>
	27	#include <fcntl.h>
	28	#define pipe(fds) _pipe(fds, 4096, _O_BINARY)
	29	#endif
	30	#include "libsigrok.h"
	31	#include "libsigrok-internal.h"
	32
	33	/* TODO: Number of probes should be configurable. */
	34	#define NUM_PROBES 8
	35
	36	#define DEMONAME "Demo device"
	37
	38	/* The size of chunks to send through the session bus. */
	39	/* TODO: Should be configurable. */
	40	#define BUFSIZE 4096
	41
	42	/* Supported patterns which we can generate */
	43	enum {
	44	/**
	45	* Pattern which spells "sigrok" using '0's (with '1's as "background")
	46	* when displayed using the 'bits' output format.
	47	*/
	48	PATTERN_SIGROK,
	49
	50	/** Pattern which consists of (pseudo-)random values on all probes. */
	51	PATTERN_RANDOM,
	52
	53	/**
	54	* Pattern which consists of incrementing numbers.
	55	* TODO: Better description.
	56	*/
	57	PATTERN_INC,
	58
	59	/** Pattern where all probes have a low logic state. */
	60	PATTERN_ALL_LOW,
	61
	62	/** Pattern where all probes have a high logic state. */
	63	PATTERN_ALL_HIGH,
	64	};
	65
	66	/* FIXME: Should not be global. */
	67
	68	struct context {
	69	int pipe_fds[2];
	70	GIOChannel *channels[2];
	71	uint8_t sample_generator;
	72	uint8_t thread_running;
	73	uint64_t samples_counter;
	74	int dev_index;
	75	void *session_dev_id;
	76	GTimer *timer;
	77	};
	78
	79	static const int hwcaps[] = {
	80	SR_HWCAP_LOGIC_ANALYZER,
	81	SR_HWCAP_DEMO_DEV,
	82	SR_HWCAP_SAMPLERATE,
	83	SR_HWCAP_PATTERN_MODE,
	84	SR_HWCAP_LIMIT_SAMPLES,
	85	SR_HWCAP_LIMIT_MSEC,
	86	SR_HWCAP_CONTINUOUS,
	87	};
	88
	89	static const struct sr_samplerates samplerates = {
	90	SR_HZ(1),
	91	SR_GHZ(1),
	92	SR_HZ(1),
	93	NULL,
	94	};
	95
	96	static const char *pattern_strings[] = {
	97	"sigrok",
	98	"random",
	99	"incremental",
	100	"all-low",
	101	"all-high",
	102	NULL,
	103	};
	104
	105	/* We name the probes 0-7 on our demo driver. */
	106	static const char *probe_names[NUM_PROBES + 1] = {
	107	"0",
	108	"1",
	109	"2",
	110	"3",
	111	"4",
	112	"5",
	113	"6",
	114	"7",
	115	NULL,
	116	};
	117
	118	static uint8_t pattern_sigrok[] = {
	119	0x4c, 0x92, 0x92, 0x92, 0x64, 0x00, 0x00, 0x00,
	120	0x82, 0xfe, 0xfe, 0x82, 0x00, 0x00, 0x00, 0x00,
	121	0x7c, 0x82, 0x82, 0x92, 0x74, 0x00, 0x00, 0x00,
	122	0xfe, 0x12, 0x12, 0x32, 0xcc, 0x00, 0x00, 0x00,
	123	0x7c, 0x82, 0x82, 0x82, 0x7c, 0x00, 0x00, 0x00,
	124	0xfe, 0x10, 0x28, 0x44, 0x82, 0x00, 0x00, 0x00,
	125	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
	126	0xbe, 0xbe, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
	127	};
	128
	129	/* Private, per-device-instance driver context. */
	130	/* TODO: struct context as with the other drivers. */
	131
	132	/* List of struct sr_dev_inst, maintained by dev_open()/dev_close(). */
	133	static GSList *dev_insts = NULL;
	134	static uint64_t cur_samplerate = SR_KHZ(200);
	135	static uint64_t limit_samples = 0;
	136	static uint64_t limit_msec = 0;
	137	static int default_pattern = PATTERN_SIGROK;
	138	static GThread *my_thread;
	139	static int thread_running;
	140
	141	static int hw_dev_acquisition_stop(int dev_index, void *cb_data);
	142
	143	static int hw_init(void)
	144	{
	145	struct sr_dev_inst *sdi;
	146
	147	sdi = sr_dev_inst_new(0, SR_ST_ACTIVE, DEMONAME, NULL, NULL);
	148	if (!sdi) {
	149	sr_err("demo: %s: sr_dev_inst_new failed", __func__);
	150	return 0;
	151	}
	152
	153	dev_insts = g_slist_append(dev_insts, sdi);
	154
	155	return 1;
	156	}
	157
	158	static int hw_dev_open(int dev_index)
	159	{
	160	/* Avoid compiler warnings. */
	161	(void)dev_index;
	162
	163	/* Nothing needed so far. */
	164
	165	return SR_OK;
	166	}
	167
	168	static int hw_dev_close(int dev_index)
	169	{
	170	/* Avoid compiler warnings. */
	171	(void)dev_index;
	172
	173	/* Nothing needed so far. */
	174
	175	return SR_OK;
	176	}
	177
	178	static int hw_cleanup(void)
	179	{
	180	/* Nothing needed so far. */
	181	return SR_OK;
	182	}
	183
	184	static const void *hw_dev_info_get(int dev_index, int dev_info_id)
	185	{
	186	struct sr_dev_inst *sdi;
	187	const void *info = NULL;
	188
	189	if (!(sdi = sr_dev_inst_get(dev_insts, dev_index))) {
	190	sr_err("demo: %s: sdi was NULL", __func__);
	191	return NULL;
	192	}
	193
	194	switch (dev_info_id) {
	195	case SR_DI_INST:
	196	info = sdi;
	197	break;
	198	case SR_DI_NUM_PROBES:
	199	info = GINT_TO_POINTER(NUM_PROBES);
	200	break;
	201	case SR_DI_PROBE_NAMES:
	202	info = probe_names;
	203	break;
	204	case SR_DI_SAMPLERATES:
	205	info = &samplerates;
	206	break;
	207	case SR_DI_CUR_SAMPLERATE:
	208	info = &cur_samplerate;
	209	break;
	210	case SR_DI_PATTERNS:
	211	info = &pattern_strings;
	212	break;
	213	}
	214
	215	return info;
	216	}
	217
	218	static int hw_dev_status_get(int dev_index)
	219	{
	220	/* Avoid compiler warnings. */
	221	(void)dev_index;
	222
	223	return SR_ST_ACTIVE;
	224	}
	225
	226	static const int *hw_hwcap_get_all(void)
	227	{
	228	return hwcaps;
	229	}
	230
	231	static int hw_dev_config_set(int dev_index, int hwcap, const void *value)
	232	{
	233	int ret;
	234	const char *stropt;
	235
	236	/* Avoid compiler warnings. */
	237	(void)dev_index;
	238
	239	if (hwcap == SR_HWCAP_PROBECONFIG) {
	240	/* Nothing to do, but must be supported */
	241	ret = SR_OK;
	242	} else if (hwcap == SR_HWCAP_SAMPLERATE) {
	243	cur_samplerate = (const uint64_t )value;
	244	sr_dbg("demo: %s: setting samplerate to %" PRIu64, __func__,
	245	cur_samplerate);
	246	ret = SR_OK;
	247	} else if (hwcap == SR_HWCAP_LIMIT_SAMPLES) {
	248	limit_msec = 0;
	249	limit_samples = (const uint64_t )value;
	250	sr_dbg("demo: %s: setting limit_samples to %" PRIu64, __func__,
	251	limit_samples);
	252	ret = SR_OK;
	253	} else if (hwcap == SR_HWCAP_LIMIT_MSEC) {
	254	limit_msec = (const uint64_t )value;
	255	limit_samples = 0;
	256	sr_dbg("demo: %s: setting limit_msec to %" PRIu64, __func__,
	257	limit_msec);
	258	ret = SR_OK;
	259	} else if (hwcap == SR_HWCAP_PATTERN_MODE) {
	260	stropt = value;
	261	ret = SR_OK;
	262	if (!strcmp(stropt, "sigrok")) {
	263	default_pattern = PATTERN_SIGROK;
	264	} else if (!strcmp(stropt, "random")) {
	265	default_pattern = PATTERN_RANDOM;
	266	} else if (!strcmp(stropt, "incremental")) {
	267	default_pattern = PATTERN_INC;
	268	} else if (!strcmp(stropt, "all-low")) {
	269	default_pattern = PATTERN_ALL_LOW;
	270	} else if (!strcmp(stropt, "all-high")) {
	271	default_pattern = PATTERN_ALL_HIGH;
	272	} else {
	273	ret = SR_ERR;
	274	}
	275	sr_dbg("demo: %s: setting pattern to %d", __func__,
	276	default_pattern);
	277	} else {
	278	ret = SR_ERR;
	279	}
	280
	281	return ret;
	282	}
	283
	284	static void samples_generator(uint8_t buf, uint64_t size, void data)
	285	{
	286	static uint64_t p = 0;
	287	struct context *ctx = data;
	288	uint64_t i;
	289
	290	/* TODO: Needed? */
	291	memset(buf, 0, size);
	292
	293	switch (ctx->sample_generator) {
	294	case PATTERN_SIGROK: /* sigrok pattern */
	295	for (i = 0; i < size; i++) {
	296	*(buf + i) = ~(pattern_sigrok[p] >> 1);
	297	if (++p == 64)
	298	p = 0;
	299	}
	300	break;
	301	case PATTERN_RANDOM: /* Random */
	302	for (i = 0; i < size; i++)
	303	*(buf + i) = (uint8_t)(rand() & 0xff);
	304	break;
	305	case PATTERN_INC: /* Simple increment */
	306	for (i = 0; i < size; i++)
	307	*(buf + i) = i;
	308	break;
	309	case PATTERN_ALL_LOW: /* All probes are low */
	310	memset(buf, 0x00, size);
	311	break;
	312	case PATTERN_ALL_HIGH: /* All probes are high */
	313	memset(buf, 0xff, size);
	314	break;
	315	default:
	316	sr_err("demo: %s: unknown pattern %d", __func__,
	317	ctx->sample_generator);
	318	break;
	319	}
	320	}
	321
	322	/* Thread function */
	323	static void thread_func(void *data)
	324	{
	325	struct context *ctx = data;
	326	uint8_t buf[BUFSIZE];
	327	uint64_t nb_to_send = 0;
	328	int bytes_written;
	329	double time_cur, time_last, time_diff;
	330
	331	time_last = g_timer_elapsed(ctx->timer, NULL);
	332
	333	while (thread_running) {
	334	/* Rate control */
	335	time_cur = g_timer_elapsed(ctx->timer, NULL);
	336
	337	time_diff = time_cur - time_last;
	338	time_last = time_cur;
	339
	340	nb_to_send = cur_samplerate * time_diff;
	341
	342	if (limit_samples) {
	343	nb_to_send = MIN(nb_to_send,
	344	limit_samples - ctx->samples_counter);
	345	}
	346
	347	/* Make sure we don't overflow. */
	348	nb_to_send = MIN(nb_to_send, BUFSIZE);
	349
	350	if (nb_to_send) {
	351	samples_generator(buf, nb_to_send, data);
	352	ctx->samples_counter += nb_to_send;
	353
	354	g_io_channel_write_chars(ctx->channels[1], (gchar *)&buf,
	355	nb_to_send, (gsize *)&bytes_written, NULL);
	356	}
	357
	358	/* Check if we're done. */
	359	if ((limit_msec && time_cur * 1000 > limit_msec) \|\|
	360	(limit_samples && ctx->samples_counter >= limit_samples))
	361	{
	362	close(ctx->pipe_fds[1]);
	363	thread_running = 0;
	364	}
	365
	366	g_usleep(10);
	367	}
	368	}
	369
	370	/* Callback handling data */
	371	static int receive_data(int fd, int revents, void *cb_data)
	372	{
	373	struct context *ctx = cb_data;
	374	struct sr_datafeed_packet packet;
	375	struct sr_datafeed_logic logic;
	376	static uint64_t samples_received = 0;
	377	unsigned char c[BUFSIZE];
	378	gsize z;
	379
	380	/* Avoid compiler warnings. */
	381	(void)fd;
	382	(void)revents;
	383
	384	do {
	385	g_io_channel_read_chars(ctx->channels[0],
	386	(gchar *)&c, BUFSIZE, &z, NULL);
	387
	388	if (z > 0) {
	389	packet.type = SR_DF_LOGIC;
	390	packet.payload = &logic;
	391	logic.length = z;
	392	logic.unitsize = 1;
	393	logic.data = c;
	394	sr_session_send(ctx->session_dev_id, &packet);
	395	samples_received += z;
	396	}
	397	} while (z > 0);
	398
	399	if (!thread_running && z <= 0) {
	400	/* Make sure we don't receive more packets. */
	401	g_io_channel_shutdown(ctx->channels[0], FALSE, NULL);
	402
	403	/* Send last packet. */
	404	packet.type = SR_DF_END;
	405	sr_session_send(ctx->session_dev_id, &packet);
	406
	407	return FALSE;
	408	}
	409
	410	return TRUE;
	411	}
	412
	413	static int hw_dev_acquisition_start(int dev_index, void *cb_data)
	414	{
	415	struct sr_datafeed_packet *packet;
	416	struct sr_datafeed_header *header;
	417	struct sr_datafeed_meta_logic meta;
	418	struct context *ctx;
	419
	420	/* TODO: 'ctx' is never g_free()'d? */
	421	if (!(ctx = g_try_malloc(sizeof(struct context)))) {
	422	sr_err("demo: %s: ctx malloc failed", __func__);
	423	return SR_ERR_MALLOC;
	424	}
	425
	426	ctx->sample_generator = default_pattern;
	427	ctx->session_dev_id = cb_data;
	428	ctx->dev_index = dev_index;
	429	ctx->samples_counter = 0;
	430
	431	if (pipe(ctx->pipe_fds)) {
	432	/* TODO: Better error message. */
	433	sr_err("demo: %s: pipe() failed", __func__);
	434	return SR_ERR;
	435	}
	436
	437	ctx->channels[0] = g_io_channel_unix_new(ctx->pipe_fds[0]);
	438	ctx->channels[1] = g_io_channel_unix_new(ctx->pipe_fds[1]);
	439
	440	g_io_channel_set_flags(ctx->channels[0], G_IO_FLAG_NONBLOCK, NULL);
	441
	442	/* Set channel encoding to binary (default is UTF-8). */
	443	g_io_channel_set_encoding(ctx->channels[0], NULL, NULL);
	444	g_io_channel_set_encoding(ctx->channels[1], NULL, NULL);
	445
	446	/* Make channels to unbuffered. */
	447	g_io_channel_set_buffered(ctx->channels[0], FALSE);
	448	g_io_channel_set_buffered(ctx->channels[1], FALSE);
	449
	450	sr_session_source_add_channel(ctx->channels[0], G_IO_IN \| G_IO_ERR,
	451	40, receive_data, ctx);
	452
	453	/* Run the demo thread. */
	454	g_thread_init(NULL);
	455	/* This must to be done between g_thread_init() & g_thread_create(). */
	456	ctx->timer = g_timer_new();
	457	thread_running = 1;
	458	my_thread =
	459	g_thread_create((GThreadFunc)thread_func, ctx, TRUE, NULL);
	460	if (!my_thread) {
	461	sr_err("demo: %s: g_thread_create failed", __func__);
	462	return SR_ERR; /* TODO */
	463	}
	464
	465	if (!(packet = g_try_malloc(sizeof(struct sr_datafeed_packet)))) {
	466	sr_err("demo: %s: packet malloc failed", __func__);
	467	return SR_ERR_MALLOC;
	468	}
	469
	470	if (!(header = g_try_malloc(sizeof(struct sr_datafeed_header)))) {
	471	sr_err("demo: %s: header malloc failed", __func__);
	472	return SR_ERR_MALLOC;
	473	}
	474
	475	packet->type = SR_DF_HEADER;
	476	packet->payload = header;
	477	header->feed_version = 1;
	478	gettimeofday(&header->starttime, NULL);
	479	sr_session_send(ctx->session_dev_id, packet);
	480
	481	/* Send metadata about the SR_DF_LOGIC packets to come. */
	482	packet->type = SR_DF_META_LOGIC;
	483	packet->payload = &meta;
	484	meta.samplerate = cur_samplerate;
	485	meta.num_probes = NUM_PROBES;
	486	sr_session_send(ctx->session_dev_id, packet);
	487
	488	g_free(header);
	489	g_free(packet);
	490
	491	return SR_OK;
	492	}
	493
	494	/* TODO: This stops acquisition on ALL devices, ignoring dev_index. */
	495	static int hw_dev_acquisition_stop(int dev_index, void *cb_data)
	496	{
	497	/* Avoid compiler warnings. */
	498	(void)dev_index;
	499	(void)cb_data;
	500
	501	/* Stop generate thread. */
	502	thread_running = 0;
	503
	504	return SR_OK;
	505	}
	506
	507	SR_PRIV struct sr_dev_driver demo_driver_info = {
	508	.name = "demo",
	509	.longname = "Demo driver and pattern generator",
	510	.api_version = 1,
	511	.init = hw_init,
	512	.cleanup = hw_cleanup,
	513	.dev_open = hw_dev_open,
	514	.dev_close = hw_dev_close,
	515	.dev_info_get = hw_dev_info_get,
	516	.dev_status_get = hw_dev_status_get,
	517	.hwcap_get_all = hw_hwcap_get_all,
	518	.dev_config_set = hw_dev_config_set,
	519	.dev_acquisition_start = hw_dev_acquisition_start,
	520	.dev_acquisition_stop = hw_dev_acquisition_stop,
	521	};