[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 "sigrok.h"
#include "sigrok-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. */
SR_PRIV GIOChannel *channels[2];

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

static 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 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(const char *devinfo)
{
	struct sr_dev_inst *sdi;

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

	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 void *hw_dev_info_get(int dev_index, int dev_info_id)
{
	struct sr_dev_inst *sdi;
	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_PATTERNMODES:
		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 int *hw_hwcap_get_all(void)
{
	return hwcaps;
}

static int hw_dev_config_set(int dev_index, int hwcap, void *value)
{
	int ret;
	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 = *(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_samples = *(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 = *(uint64_t *)value;
		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 databag *mydata = data;
	uint64_t i;

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

	switch (mydata->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:
		/* TODO: Error handling. */
		break;
	}
}

/* Thread function */
static void thread_func(void *data)
{
	struct databag *mydata = 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(mydata->timer, NULL);

	while (thread_running) {
		/* Rate control */
		time_cur = g_timer_elapsed(mydata->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 - mydata->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);
			mydata->samples_counter += nb_to_send;

			g_io_channel_write_chars(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 && mydata->samples_counter >= limit_samples))
		{
			close(mydata->pipe_fds[1]);
			thread_running = 0;
		}

		g_usleep(10);
	}
}

/* Callback handling data */
static int receive_data(int fd, int revents, void *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(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(cb_data, &packet);
			samples_received += z;
		}
	} while (z > 0);

	if (!thread_running && z <= 0) {
		/* Make sure we don't receive more packets. */
		g_io_channel_close(channels[0]);

		/* Send last packet. */
		packet.type = SR_DF_END;
		sr_session_send(cb_data, &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 databag *mydata;

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

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

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

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

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

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

	sr_source_add(mydata->pipe_fds[0], G_IO_IN | G_IO_ERR, 40,
		      receive_data, mydata->session_dev_id);

	/* Run the demo thread. */
	g_thread_init(NULL);
	/* This must to be done between g_thread_init() & g_thread_create(). */
	mydata->timer = g_timer_new();
	thread_running = 1;
	my_thread =
	    g_thread_create((GThreadFunc)thread_func, mydata, 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);
	header->samplerate = cur_samplerate;
	header->num_logic_probes = NUM_PROBES;
	sr_session_send(mydata->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 "sigrok.h"
	31	#include "sigrok-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	SR_PRIV GIOChannel *channels[2];
	68
	69	struct databag {
	70	int pipe_fds[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 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 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(const char *devinfo)
	144	{
	145	struct sr_dev_inst *sdi;
	146
	147	/* Avoid compiler warnings. */
	148	(void)devinfo;
	149
	150	sdi = sr_dev_inst_new(0, SR_ST_ACTIVE, DEMONAME, NULL, NULL);
	151	if (!sdi) {
	152	sr_err("demo: %s: sr_dev_inst_new failed", __func__);
	153	return 0;
	154	}
	155
	156	dev_insts = g_slist_append(dev_insts, sdi);
	157
	158	return 1;
	159	}
	160
	161	static int hw_dev_open(int dev_index)
	162	{
	163	/* Avoid compiler warnings. */
	164	(void)dev_index;
	165
	166	/* Nothing needed so far. */
	167
	168	return SR_OK;
	169	}
	170
	171	static int hw_dev_close(int dev_index)
	172	{
	173	/* Avoid compiler warnings. */
	174	(void)dev_index;
	175
	176	/* Nothing needed so far. */
	177
	178	return SR_OK;
	179	}
	180
	181	static int hw_cleanup(void)
	182	{
	183	/* Nothing needed so far. */
	184	return SR_OK;
	185	}
	186
	187	static void *hw_dev_info_get(int dev_index, int dev_info_id)
	188	{
	189	struct sr_dev_inst *sdi;
	190	void *info = NULL;
	191
	192	if (!(sdi = sr_dev_inst_get(dev_insts, dev_index))) {
	193	sr_err("demo: %s: sdi was NULL", __func__);
	194	return NULL;
	195	}
	196
	197	switch (dev_info_id) {
	198	case SR_DI_INST:
	199	info = sdi;
	200	break;
	201	case SR_DI_NUM_PROBES:
	202	info = GINT_TO_POINTER(NUM_PROBES);
	203	break;
	204	case SR_DI_PROBE_NAMES:
	205	info = probe_names;
	206	break;
	207	case SR_DI_SAMPLERATES:
	208	info = &samplerates;
	209	break;
	210	case SR_DI_CUR_SAMPLERATE:
	211	info = &cur_samplerate;
	212	break;
	213	case SR_DI_PATTERNMODES:
	214	info = &pattern_strings;
	215	break;
	216	}
	217
	218	return info;
	219	}
	220
	221	static int hw_dev_status_get(int dev_index)
	222	{
	223	/* Avoid compiler warnings. */
	224	(void)dev_index;
	225
	226	return SR_ST_ACTIVE;
	227	}
	228
	229	static int *hw_hwcap_get_all(void)
	230	{
	231	return hwcaps;
	232	}
	233
	234	static int hw_dev_config_set(int dev_index, int hwcap, void *value)
	235	{
	236	int ret;
	237	char *stropt;
	238
	239	/* Avoid compiler warnings. */
	240	(void)dev_index;
	241
	242	if (hwcap == SR_HWCAP_PROBECONFIG) {
	243	/* Nothing to do, but must be supported */
	244	ret = SR_OK;
	245	} else if (hwcap == SR_HWCAP_SAMPLERATE) {
	246	cur_samplerate = (uint64_t )value;
	247	sr_dbg("demo: %s: setting samplerate to %" PRIu64, __func__,
	248	cur_samplerate);
	249	ret = SR_OK;
	250	} else if (hwcap == SR_HWCAP_LIMIT_SAMPLES) {
	251	limit_samples = (uint64_t )value;
	252	sr_dbg("demo: %s: setting limit_samples to %" PRIu64, __func__,
	253	limit_samples);
	254	ret = SR_OK;
	255	} else if (hwcap == SR_HWCAP_LIMIT_MSEC) {
	256	limit_msec = (uint64_t )value;
	257	sr_dbg("demo: %s: setting limit_msec to %" PRIu64, __func__,
	258	limit_msec);
	259	ret = SR_OK;
	260	} else if (hwcap == SR_HWCAP_PATTERN_MODE) {
	261	stropt = value;
	262	ret = SR_OK;
	263	if (!strcmp(stropt, "sigrok")) {
	264	default_pattern = PATTERN_SIGROK;
	265	} else if (!strcmp(stropt, "random")) {
	266	default_pattern = PATTERN_RANDOM;
	267	} else if (!strcmp(stropt, "incremental")) {
	268	default_pattern = PATTERN_INC;
	269	} else if (!strcmp(stropt, "all-low")) {
	270	default_pattern = PATTERN_ALL_LOW;
	271	} else if (!strcmp(stropt, "all-high")) {
	272	default_pattern = PATTERN_ALL_HIGH;
	273	} else {
	274	ret = SR_ERR;
	275	}
	276	sr_dbg("demo: %s: setting pattern to %d", __func__,
	277	default_pattern);
	278	} else {
	279	ret = SR_ERR;
	280	}
	281
	282	return ret;
	283	}
	284
	285	static void samples_generator(uint8_t buf, uint64_t size, void data)
	286	{
	287	static uint64_t p = 0;
	288	struct databag *mydata = data;
	289	uint64_t i;
	290
	291	/* TODO: Needed? */
	292	memset(buf, 0, size);
	293
	294	switch (mydata->sample_generator) {
	295	case PATTERN_SIGROK: /* sigrok pattern */
	296	for (i = 0; i < size; i++) {
	297	*(buf + i) = ~(pattern_sigrok[p] >> 1);
	298	if (++p == 64)
	299	p = 0;
	300	}
	301	break;
	302	case PATTERN_RANDOM: /* Random */
	303	for (i = 0; i < size; i++)
	304	*(buf + i) = (uint8_t)(rand() & 0xff);
	305	break;
	306	case PATTERN_INC: /* Simple increment */
	307	for (i = 0; i < size; i++)
	308	*(buf + i) = i;
	309	break;
	310	case PATTERN_ALL_LOW: /* All probes are low */
	311	memset(buf, 0x00, size);
	312	break;
	313	case PATTERN_ALL_HIGH: /* All probes are high */
	314	memset(buf, 0xff, size);
	315	break;
	316	default:
	317	/* TODO: Error handling. */
	318	break;
	319	}
	320	}
	321
	322	/* Thread function */
	323	static void thread_func(void *data)
	324	{
	325	struct databag *mydata = 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(mydata->timer, NULL);
	332
	333	while (thread_running) {
	334	/* Rate control */
	335	time_cur = g_timer_elapsed(mydata->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 - mydata->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	mydata->samples_counter += nb_to_send;
	353
	354	g_io_channel_write_chars(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 && mydata->samples_counter >= limit_samples))
	361	{
	362	close(mydata->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 sr_datafeed_packet packet;
	374	struct sr_datafeed_logic logic;
	375	static uint64_t samples_received = 0;
	376	unsigned char c[BUFSIZE];
	377	gsize z;
	378
	379	/* Avoid compiler warnings. */
	380	(void)fd;
	381	(void)revents;
	382
	383	do {
	384	g_io_channel_read_chars(channels[0],
	385	(gchar *)&c, BUFSIZE, &z, NULL);
	386
	387	if (z > 0) {
	388	packet.type = SR_DF_LOGIC;
	389	packet.payload = &logic;
	390	logic.length = z;
	391	logic.unitsize = 1;
	392	logic.data = c;
	393	sr_session_send(cb_data, &packet);
	394	samples_received += z;
	395	}
	396	} while (z > 0);
	397
	398	if (!thread_running && z <= 0) {
	399	/* Make sure we don't receive more packets. */
	400	g_io_channel_close(channels[0]);
	401
	402	/* Send last packet. */
	403	packet.type = SR_DF_END;
	404	sr_session_send(cb_data, &packet);
	405
	406	return FALSE;
	407	}
	408
	409	return TRUE;
	410	}
	411
	412	static int hw_dev_acquisition_start(int dev_index, void *cb_data)
	413	{
	414	struct sr_datafeed_packet *packet;
	415	struct sr_datafeed_header *header;
	416	struct databag *mydata;
	417
	418	/* TODO: 'mydata' is never g_free()'d? */
	419	if (!(mydata = g_try_malloc(sizeof(struct databag)))) {
	420	sr_err("demo: %s: mydata malloc failed", __func__);
	421	return SR_ERR_MALLOC;
	422	}
	423
	424	mydata->sample_generator = default_pattern;
	425	mydata->session_dev_id = cb_data;
	426	mydata->dev_index = dev_index;
	427	mydata->samples_counter = 0;
	428
	429	if (pipe(mydata->pipe_fds)) {
	430	/* TODO: Better error message. */
	431	sr_err("demo: %s: pipe() failed", __func__);
	432	return SR_ERR;
	433	}
	434
	435	channels[0] = g_io_channel_unix_new(mydata->pipe_fds[0]);
	436	channels[1] = g_io_channel_unix_new(mydata->pipe_fds[1]);
	437
	438	/* Set channel encoding to binary (default is UTF-8). */
	439	g_io_channel_set_encoding(channels[0], NULL, NULL);
	440	g_io_channel_set_encoding(channels[1], NULL, NULL);
	441
	442	/* Make channels to unbuffered. */
	443	g_io_channel_set_buffered(channels[0], FALSE);
	444	g_io_channel_set_buffered(channels[1], FALSE);
	445
	446	sr_source_add(mydata->pipe_fds[0], G_IO_IN \| G_IO_ERR, 40,
	447	receive_data, mydata->session_dev_id);
	448
	449	/* Run the demo thread. */
	450	g_thread_init(NULL);
	451	/* This must to be done between g_thread_init() & g_thread_create(). */
	452	mydata->timer = g_timer_new();
	453	thread_running = 1;
	454	my_thread =
	455	g_thread_create((GThreadFunc)thread_func, mydata, TRUE, NULL);
	456	if (!my_thread) {
	457	sr_err("demo: %s: g_thread_create failed", __func__);
	458	return SR_ERR; /* TODO */
	459	}
	460
	461	if (!(packet = g_try_malloc(sizeof(struct sr_datafeed_packet)))) {
	462	sr_err("demo: %s: packet malloc failed", __func__);
	463	return SR_ERR_MALLOC;
	464	}
	465
	466	if (!(header = g_try_malloc(sizeof(struct sr_datafeed_header)))) {
	467	sr_err("demo: %s: header malloc failed", __func__);
	468	return SR_ERR_MALLOC;
	469	}
	470
	471	packet->type = SR_DF_HEADER;
	472	packet->payload = header;
	473	header->feed_version = 1;
	474	gettimeofday(&header->starttime, NULL);
	475	header->samplerate = cur_samplerate;
	476	header->num_logic_probes = NUM_PROBES;
	477	sr_session_send(mydata->session_dev_id, packet);
	478	g_free(header);
	479	g_free(packet);
	480
	481	return SR_OK;
	482	}
	483
	484	/* TODO: This stops acquisition on ALL devices, ignoring dev_index. */
	485	static int hw_dev_acquisition_stop(int dev_index, void *cb_data)
	486	{
	487	/* Avoid compiler warnings. */
	488	(void)dev_index;
	489	(void)cb_data;
	490
	491	/* Stop generate thread. */
	492	thread_running = 0;
	493
	494	return SR_OK;
	495	}
	496
	497	SR_PRIV struct sr_dev_driver demo_driver_info = {
	498	.name = "demo",
	499	.longname = "Demo driver and pattern generator",
	500	.api_version = 1,
	501	.init = hw_init,
	502	.cleanup = hw_cleanup,
	503	.dev_open = hw_dev_open,
	504	.dev_close = hw_dev_close,
	505	.dev_info_get = hw_dev_info_get,
	506	.dev_status_get = hw_dev_status_get,
	507	.hwcap_get_all = hw_hwcap_get_all,
	508	.dev_config_set = hw_dev_config_set,
	509	.dev_acquisition_start = hw_dev_acquisition_start,
	510	.dev_acquisition_stop = hw_dev_acquisition_stop,
	511	};