[libsigrok.git] / src / hardware / baylibre-acme / protocol.c

/*
 * This file is part of the libsigrok project.
 *
 * Copyright (C) 2015 Bartosz Golaszewski <bgolaszewski@baylibre.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 <string.h>
#include <stdlib.h>
#include <errno.h>
#include <fcntl.h>
#include <glib/gstdio.h>
#include "protocol.h"
#include "gpio.h"

struct channel_group_priv {
	int hwmon_num;
	int probe_type;
	int index;
};

struct channel_priv {
	int ch_type;
	struct channel_group_priv *probe;
};

static const uint8_t enrg_i2c_addrs[] = {
	0x40, 0x41, 0x44, 0x45, 0x42, 0x43, 0x46, 0x47,
};

static const uint8_t temp_i2c_addrs[] = {
	0x0, 0x0, 0x0, 0x0, 0x4c, 0x49, 0x4f, 0x4b,
};

static const uint32_t pws_gpios[] = {
	486, 498, 502, 482, 478, 506, 510, 474,
};

static const uint32_t pws_info_gpios[] = {
	487, 499, 503, 483, 479, 507, 511, 475,
};

#define MOHM_TO_UOHM(x) ((x) * 1000)
#define UOHM_TO_MOHM(x) ((x) / 1000)

SR_PRIV uint8_t bl_acme_get_enrg_addr(int index)
{
	return enrg_i2c_addrs[index];
}

SR_PRIV uint8_t bl_acme_get_temp_addr(int index)
{
	return temp_i2c_addrs[index];
}

SR_PRIV gboolean bl_acme_is_sane(void)
{
	gboolean status;

	/*
	 * We expect sysfs to be present and mounted at /sys, ina226 and
	 * tmp435 sensors detected by the system and their appropriate
	 * drivers loaded and functional.
	 */
	status = g_file_test("/sys", G_FILE_TEST_IS_DIR);
	if (!status) {
		sr_err("/sys/ directory not found - sysfs not mounted?");
		return FALSE;
	}

	return TRUE;
}

static void probe_name_path(unsigned int addr, GString *path)
{
	g_string_printf(path,
			"/sys/class/i2c-adapter/i2c-1/1-00%02x/name", addr);
}

/*
 * For given address fill buf with the path to appropriate hwmon entry.
 */
static void probe_hwmon_path(unsigned int addr, GString *path)
{
	g_string_printf(path,
			"/sys/class/i2c-adapter/i2c-1/1-00%02x/hwmon", addr);
}

SR_PRIV gboolean bl_acme_detect_probe(unsigned int addr,
				      int prb_num, const char *prb_name)
{
	gboolean ret = FALSE, status;
	char *buf = NULL;
	GString *path = g_string_sized_new(64);
	GError *err = NULL;
	gsize size;

	probe_name_path(addr, path);
	status = g_file_get_contents(path->str, &buf, &size, &err);
	if (!status) {
		sr_dbg("Name for probe %d can't be read: %s",
		       prb_num, err->message);
		g_string_free(path, TRUE);
		return ret;
	}

	if (!strncmp(buf, prb_name, strlen(prb_name))) {
		/*
		 * Correct driver registered on this address - but is
		 * there an actual probe connected?
		 */
		probe_hwmon_path(addr, path);
		status = g_file_test(path->str, G_FILE_TEST_IS_DIR);
		if (status) {
			/* We have found an ACME probe. */
			ret = TRUE;
		}
	}

	g_free(buf);
	g_string_free(path, TRUE);

	return ret;
}

static int get_hwmon_index(unsigned int addr)
{
	int status, hwmon;
	GString *path = g_string_sized_new(64);
	GError *err = NULL;
	GDir *dir;

	probe_hwmon_path(addr, path);
	dir = g_dir_open(path->str, 0, &err);
	if (!dir) {
		sr_err("Error opening %s: %s", path->str, err->message);
		g_string_free(path, TRUE);
		return -1;
	}

	g_string_free(path, TRUE);

	/*
	 * The directory should contain a single file named hwmonX where X
	 * is the hwmon index.
	 */
	status = sscanf(g_dir_read_name(dir), "hwmon%d", &hwmon);
	g_dir_close(dir);
	if (status != 1) {
		sr_err("Unable to determine the hwmon entry");
		return -1;
	}

	return hwmon;
}

static void append_channel(struct sr_dev_inst *sdi, struct sr_channel_group *cg,
			   int index, int type)
{
	struct channel_priv *cp;
	struct dev_context *devc;
	struct sr_channel *ch;
	char *name;

	devc = sdi->priv;

	switch (type) {
	case ENRG_PWR:
		name = g_strdup_printf("P%d_ENRG_PWR", index);
		break;
	case ENRG_CURR:
		name = g_strdup_printf("P%d_ENRG_CURR", index);
		break;
	case ENRG_VOL:
		name = g_strdup_printf("P%d_ENRG_VOL", index);
		break;
	case TEMP_IN:
		name = g_strdup_printf("P%d_TEMP_IN", index);
		break;
	case TEMP_OUT:
		name = g_strdup_printf("P%d_TEMP_OUT", index);
		break;
	default:
		sr_err("Invalid channel type: %d.", type);
		return;
	}

	cp = g_malloc0(sizeof(struct channel_priv));
	cp->ch_type = type;
	cp->probe = cg->priv;

	ch = sr_channel_new(devc->num_channels++,
			    SR_CHANNEL_ANALOG, TRUE, name);
	g_free(name);

	ch->priv = cp;
	cg->channels = g_slist_append(cg->channels, ch);
	sdi->channels = g_slist_append(sdi->channels, ch);
}

SR_PRIV gboolean bl_acme_register_probe(struct sr_dev_inst *sdi, int type,
					unsigned int addr, int prb_num)
{
	struct sr_channel_group *cg;
	struct channel_group_priv *cgp;
	int hwmon;

	/* Obtain the hwmon index. */
	hwmon = get_hwmon_index(addr);
	if (hwmon < 0)
		return FALSE;

	cg = g_malloc0(sizeof(struct sr_channel_group));
	cgp = g_malloc0(sizeof(struct channel_group_priv));
	cgp->hwmon_num = hwmon;
	cgp->probe_type = type;
	cgp->index = prb_num - 1;
	cg->name = g_strdup_printf("Probe_%d", prb_num);
	cg->priv = cgp;

	if (type == PROBE_ENRG) {
		append_channel(sdi, cg, prb_num, ENRG_PWR);
		append_channel(sdi, cg, prb_num, ENRG_CURR);
		append_channel(sdi, cg, prb_num, ENRG_VOL);
	} else if (type == PROBE_TEMP) {
		append_channel(sdi, cg, prb_num, TEMP_IN);
		append_channel(sdi, cg, prb_num, TEMP_OUT);
	} else {
		sr_err("Invalid probe type: %d.", type);
	}

	sdi->channel_groups = g_slist_append(sdi->channel_groups, cg);

	return TRUE;
}

/*
 * Sets path to the hwmon attribute if this channel group
 * supports shunt resistance setting. The caller has to supply
 * a valid GString.
 */
static int get_shunt_path(const struct sr_channel_group *cg, GString *path)
{
	struct channel_group_priv *cgp;
	int ret = SR_OK, status;

	cgp = cg->priv;

	if (cgp->probe_type != PROBE_ENRG) {
		sr_err("Probe doesn't support shunt resistance setting");
		return SR_ERR_ARG;
	}

	g_string_append_printf(path,
			       "/sys/class/hwmon/hwmon%d/shunt_resistor",
			       cgp->hwmon_num);

	/*
	 * The shunt_resistor sysfs attribute is available
	 * in the Linux kernel since version 3.20. We have
	 * to notify the user if this attribute is not present.
	 */
	status = g_file_test(path->str, G_FILE_TEST_EXISTS);
	if (!status) {
		sr_err("shunt_resistance attribute not present, please update "
		       "your kernel to version >=3.20");
		return SR_ERR_NA;
	}

	return ret;
}

SR_PRIV int bl_acme_get_shunt(const struct sr_channel_group *cg,
			      uint64_t *shunt)
{
	GString *path = g_string_sized_new(64);
	gchar *contents;
	int status, ret = SR_OK;
	GError *err = NULL;

	status = get_shunt_path(cg, path);
	if (status != SR_OK) {
		ret = status;
		goto out;
	}

	status = g_file_get_contents(path->str, &contents, NULL, &err);
	if (!status) {
		sr_err("Error reading shunt resistance: %s", err->message);
		ret = SR_ERR_IO;
		goto out;
	}

	*shunt = UOHM_TO_MOHM(strtol(contents, NULL, 10));

out:
	g_string_free(path, TRUE);
	return ret;
}

SR_PRIV int bl_acme_set_shunt(const struct sr_channel_group *cg, uint64_t shunt)
{
	GString *path = g_string_sized_new(64);;
	int status, ret = SR_OK;
	FILE *fd;

	status = get_shunt_path(cg, path);
	if (status != SR_OK) {
		ret = status;
		goto out;
	}

	/*
	 * Can't use g_file_set_contents() here, as it calls open() with
	 * O_EXEC flag in a sysfs directory thus failing with EACCES.
	 */
	fd = g_fopen(path->str, "w");
	if (!fd) {
		sr_err("Error opening %s: %s", path->str, strerror(errno));
		g_string_free(path, TRUE);
		return SR_ERR_IO;
	}

	g_string_free(path, TRUE);
	g_fprintf(fd, "%" PRIu64 "\n", MOHM_TO_UOHM(shunt));
	fclose(fd);

out:
	g_string_free(path, TRUE);
	return ret;
}

SR_PRIV int bl_acme_read_power_state(const struct sr_channel_group *cg,
				     gboolean *off)
{
	struct channel_group_priv *cgp;
	int val;

	cgp = cg->priv;

	val = sr_gpio_getval_export(pws_info_gpios[cgp->index]);
	if (val != 1) {
		sr_err("Probe has no power-switch");
		return SR_ERR_ARG;
	}

	val = sr_gpio_getval_export(pws_gpios[cgp->index]);
	*off = val ? FALSE : TRUE;

	return SR_OK;
}

SR_PRIV int bl_acme_set_power_off(const struct sr_channel_group *cg,
				  gboolean off)
{
	struct channel_group_priv *cgp;
	int val;

	cgp = cg->priv;

	val = sr_gpio_getval_export(pws_info_gpios[cgp->index]);
	if (val != 1) {
		sr_err("Probe has no power-switch");
		return SR_ERR_ARG;
	}

	val = sr_gpio_setval_export(pws_gpios[cgp->index], off ? 0 : 1);

	return SR_OK;
}

static int channel_to_mq(struct sr_channel *ch)
{
	struct channel_priv *chp;

	chp = ch->priv;

	switch (chp->ch_type) {
	case ENRG_PWR:
		return SR_MQ_POWER;
	case ENRG_CURR:
		return SR_MQ_CURRENT;
	case ENRG_VOL:
		return SR_MQ_VOLTAGE;
	case TEMP_IN: /* Fallthrough */
	case TEMP_OUT:
		return SR_MQ_TEMPERATURE;
	default:
		return -1;
	}
}

static int channel_to_unit(struct sr_channel *ch)
{
	struct channel_priv *chp;

	chp = ch->priv;

	switch (chp->ch_type) {
	case ENRG_PWR:
		return SR_UNIT_WATT;
	case ENRG_CURR:
		return SR_UNIT_AMPERE;
	case ENRG_VOL:
		return SR_UNIT_VOLT;
	case TEMP_IN: /* Fallthrough */
	case TEMP_OUT:
		return SR_UNIT_CELSIUS;
	default:
		return -1;
	}
}

/* We need to scale measurements down from the units used by the drivers. */
static float adjust_data(int val, int type)
{
	switch (type) {
	case ENRG_PWR:
		return ((float)val) / 1000000.0;
	case ENRG_CURR: /* Fallthrough */
	case ENRG_VOL: /* Fallthrough */
	case TEMP_IN: /* Fallthrough */
	case TEMP_OUT:
		return ((float)val) / 1000.0;
	default:
		return 0.0;
	}
}

static float read_sample(struct sr_channel *ch)
{
	struct channel_priv *chp;
	char path[64], *file, buf[16];
	ssize_t len;
	int fd;

	chp = ch->priv;

	switch (chp->ch_type) {
	case ENRG_PWR:	file = "power1_input";	break;
	case ENRG_CURR:	file = "curr1_input";	break;
	case ENRG_VOL:	file = "in1_input";	break;
	case TEMP_IN:	file = "temp1_input";	break;
	case TEMP_OUT:	file = "temp2_input";	break;
	default:
		sr_err("Invalid channel type: %d.", chp->ch_type);
		return -1.0;
	}

	snprintf(path, sizeof(path), "/sys/class/hwmon/hwmon%d/%s",
		 chp->probe->hwmon_num, file);
	fd = open(path, O_RDONLY);
	if (fd < 0) {
		sr_err("Error opening %s: %s", path, strerror(errno));
		ch->enabled = FALSE;
		return -1.0;
	}

	len = read(fd, buf, sizeof(buf));
	close(fd);
	if (len < 0) {
		sr_err("Error reading from %s: %s", path, strerror(errno));
		ch->enabled = FALSE;
		return -1.0;
	}

	return adjust_data(strtol(buf, NULL, 10), chp->ch_type);
}

SR_PRIV int bl_acme_receive_data(int fd, int revents, void *cb_data)
{
	uint32_t cur_time, elapsed_time, diff_time;
	int64_t time_to_sleep;
	struct sr_datafeed_packet packet, framep;
	struct sr_datafeed_analog analog;
	struct sr_dev_inst *sdi;
	struct sr_channel *ch;
	struct dev_context *devc;
	GSList *chl, chonly;
	float valf;

	(void)fd;
	(void)revents;

	sdi = cb_data;
	if (!sdi)
		return TRUE;

	devc = sdi->priv;
	if (!devc)
		return TRUE;

	packet.type = SR_DF_ANALOG;
	packet.payload = &analog;
	memset(&analog, 0, sizeof(analog));
	analog.data = &valf;

	/*
	 * Reading from sysfs takes some time - try to keep up with samplerate.
	 */
	if (devc->samples_read) {
		cur_time = g_get_monotonic_time();
		diff_time = cur_time - devc->last_sample_fin;
		time_to_sleep = G_USEC_PER_SEC / devc->samplerate - diff_time;
		if (time_to_sleep > 0)
			g_usleep(time_to_sleep);
	}

	framep.type = SR_DF_FRAME_BEGIN;
	sr_session_send(cb_data, &framep);

	/*
	 * Due to different units used in each channel we're sending
	 * samples one-by-one.
	 */
	for (chl = sdi->channels; chl; chl = chl->next) {
		ch = chl->data;
		if (!ch->enabled)
			continue;
		chonly.next = NULL;
		chonly.data = ch;
		analog.channels = &chonly;
		analog.num_samples = 1;
		analog.mq = channel_to_mq(chl->data);
		analog.unit = channel_to_unit(ch);

		valf = read_sample(ch);

		sr_session_send(cb_data, &packet);
	}

	framep.type = SR_DF_FRAME_END;
	sr_session_send(cb_data, &framep);

	devc->samples_read++;
	if (devc->limit_samples > 0 &&
	    devc->samples_read >= devc->limit_samples) {
		sr_info("Requested number of samples reached.");
		sdi->driver->dev_acquisition_stop(sdi, cb_data);
		devc->last_sample_fin = g_get_monotonic_time();
		return TRUE;
	} else if (devc->limit_msec > 0) {
		cur_time = g_get_monotonic_time();
		elapsed_time = cur_time - devc->start_time;

		if (elapsed_time >= devc->limit_msec) {
			sr_info("Sampling time limit reached.");
			sdi->driver->dev_acquisition_stop(sdi, cb_data);
			devc->last_sample_fin = g_get_monotonic_time();
			return TRUE;
		}
	}

	devc->last_sample_fin = g_get_monotonic_time();
	return TRUE;
}
Commit	Line	Data
dfaee1de BG	1	/*
	2	* This file is part of the libsigrok project.
	3	*
	4	* Copyright (C) 2015 Bartosz Golaszewski <bgolaszewski@baylibre.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
6b80b80d	20	#include <string.h>
391e23a9	21	#include <stdlib.h>
6b80b80d	22	#include <errno.h>
391e23a9	23	#include <fcntl.h>
61f2b7f7	24	#include <glib/gstdio.h>
dfaee1de	25	#include "protocol.h"
740ad48a	26	#include "gpio.h"
dfaee1de	27
6b80b80d BG	28	struct channel_group_priv {
6b80b80d BG	29	int hwmon_num;
61f2b7f7	30	int probe_type;
740ad48a	31	int index;
6b80b80d BG	32	};
	33
	34	struct channel_priv {
	35	int ch_type;
	36	struct channel_group_priv *probe;
	37	};
	38
	39	static const uint8_t enrg_i2c_addrs[] = {
	40	0x40, 0x41, 0x44, 0x45, 0x42, 0x43, 0x46, 0x47,
	41	};
	42
	43	static const uint8_t temp_i2c_addrs[] = {
	44	0x0, 0x0, 0x0, 0x0, 0x4c, 0x49, 0x4f, 0x4b,
	45	};
	46
740ad48a	47	static const uint32_t pws_gpios[] = {
391e23a9	48	486, 498, 502, 482, 478, 506, 510, 474,
740ad48a BG	49	};
	50
	51	static const uint32_t pws_info_gpios[] = {
	52	487, 499, 503, 483, 479, 507, 511, 475,
	53	};
	54
61f2b7f7 BG	55	#define MOHM_TO_UOHM(x) ((x) * 1000)
	56	#define UOHM_TO_MOHM(x) ((x) / 1000)
	57
6b80b80d BG	58	SR_PRIV uint8_t bl_acme_get_enrg_addr(int index)
	59	{
	60	return enrg_i2c_addrs[index];
	61	}
	62
	63	SR_PRIV uint8_t bl_acme_get_temp_addr(int index)
	64	{
	65	return temp_i2c_addrs[index];
	66	}
	67
	68	SR_PRIV gboolean bl_acme_is_sane(void)
	69	{
	70	gboolean status;
	71
	72	/*
	73	* We expect sysfs to be present and mounted at /sys, ina226 and
	74	* tmp435 sensors detected by the system and their appropriate
	75	* drivers loaded and functional.
	76	*/
	77	status = g_file_test("/sys", G_FILE_TEST_IS_DIR);
	78	if (!status) {
	79	sr_err("/sys/ directory not found - sysfs not mounted?");
	80	return FALSE;
	81	}
	82
	83	return TRUE;
	84	}
	85
	86	static void probe_name_path(unsigned int addr, GString *path)
	87	{
	88	g_string_printf(path,
	89	"/sys/class/i2c-adapter/i2c-1/1-00%02x/name", addr);
	90	}
	91
	92	/*
	93	* For given address fill buf with the path to appropriate hwmon entry.
	94	*/
	95	static void probe_hwmon_path(unsigned int addr, GString *path)
	96	{
	97	g_string_printf(path,
	98	"/sys/class/i2c-adapter/i2c-1/1-00%02x/hwmon", addr);
	99	}
	100
	101	SR_PRIV gboolean bl_acme_detect_probe(unsigned int addr,
	102	int prb_num, const char *prb_name)
	103	{
	104	gboolean ret = FALSE, status;
	105	char *buf = NULL;
	106	GString *path = g_string_sized_new(64);
	107	GError *err = NULL;
	108	gsize size;
	109
	110	probe_name_path(addr, path);
	111	status = g_file_get_contents(path->str, &buf, &size, &err);
	112	if (!status) {
	113	sr_dbg("Name for probe %d can't be read: %s",
	114	prb_num, err->message);
	115	g_string_free(path, TRUE);
	116	return ret;
6b80b80d BG	117	}
6b80b80d BG	118
391e23a9	119	if (!strncmp(buf, prb_name, strlen(prb_name))) {
6b80b80d BG	120	/*
	121	* Correct driver registered on this address - but is
	122	* there an actual probe connected?
	123	*/
	124	probe_hwmon_path(addr, path);
	125	status = g_file_test(path->str, G_FILE_TEST_IS_DIR);
	126	if (status) {
	127	/* We have found an ACME probe. */
	128	ret = TRUE;
	129	}
	130	}
	131
	132	g_free(buf);
	133	g_string_free(path, TRUE);
	134
	135	return ret;
	136	}
	137
	138	static int get_hwmon_index(unsigned int addr)
	139	{
	140	int status, hwmon;
	141	GString *path = g_string_sized_new(64);
	142	GError *err = NULL;
	143	GDir *dir;
	144
	145	probe_hwmon_path(addr, path);
	146	dir = g_dir_open(path->str, 0, &err);
391e23a9	147	if (!dir) {
6b80b80d BG	148	sr_err("Error opening %s: %s", path->str, err->message);
	149	g_string_free(path, TRUE);
	150	return -1;
	151	}
	152
	153	g_string_free(path, TRUE);
	154
	155	/*
	156	* The directory should contain a single file named hwmonX where X
	157	* is the hwmon index.
	158	*/
	159	status = sscanf(g_dir_read_name(dir), "hwmon%d", &hwmon);
	160	g_dir_close(dir);
	161	if (status != 1) {
	162	sr_err("Unable to determine the hwmon entry");
	163	return -1;
	164	}
	165
	166	return hwmon;
	167	}
	168
391e23a9	169	static void append_channel(struct sr_dev_inst sdi, struct sr_channel_group cg,
6b80b80d BG	170	int index, int type)
	171	{
	172	struct channel_priv *cp;
	173	struct dev_context *devc;
	174	struct sr_channel *ch;
	175	char *name;
	176
	177	devc = sdi->priv;
	178
	179	switch (type) {
	180	case ENRG_PWR:
	181	name = g_strdup_printf("P%d_ENRG_PWR", index);
	182	break;
	183	case ENRG_CURR:
	184	name = g_strdup_printf("P%d_ENRG_CURR", index);
	185	break;
	186	case ENRG_VOL:
	187	name = g_strdup_printf("P%d_ENRG_VOL", index);
	188	break;
	189	case TEMP_IN:
	190	name = g_strdup_printf("P%d_TEMP_IN", index);
	191	break;
	192	case TEMP_OUT:
	193	name = g_strdup_printf("P%d_TEMP_OUT", index);
	194	break;
	195	default:
391e23a9	196	sr_err("Invalid channel type: %d.", type);
6b80b80d BG	197	return;
	198	}
	199
	200	cp = g_malloc0(sizeof(struct channel_priv));
	201	cp->ch_type = type;
	202	cp->probe = cg->priv;
	203
	204	ch = sr_channel_new(devc->num_channels++,
	205	SR_CHANNEL_ANALOG, TRUE, name);
	206	g_free(name);
	207
	208	ch->priv = cp;
	209	cg->channels = g_slist_append(cg->channels, ch);
	210	sdi->channels = g_slist_append(sdi->channels, ch);
	211	}
	212
	213	SR_PRIV gboolean bl_acme_register_probe(struct sr_dev_inst *sdi, int type,
	214	unsigned int addr, int prb_num)
	215	{
	216	struct sr_channel_group *cg;
	217	struct channel_group_priv *cgp;
	218	int hwmon;
	219
	220	/* Obtain the hwmon index. */
	221	hwmon = get_hwmon_index(addr);
	222	if (hwmon < 0)
	223	return FALSE;
	224
	225	cg = g_malloc0(sizeof(struct sr_channel_group));
	226	cgp = g_malloc0(sizeof(struct channel_group_priv));
	227	cgp->hwmon_num = hwmon;
61f2b7f7	228	cgp->probe_type = type;
740ad48a	229	cgp->index = prb_num - 1;
6b80b80d BG	230	cg->name = g_strdup_printf("Probe_%d", prb_num);
	231	cg->priv = cgp;
	232
	233	if (type == PROBE_ENRG) {
	234	append_channel(sdi, cg, prb_num, ENRG_PWR);
	235	append_channel(sdi, cg, prb_num, ENRG_CURR);
	236	append_channel(sdi, cg, prb_num, ENRG_VOL);
	237	} else if (type == PROBE_TEMP) {
	238	append_channel(sdi, cg, prb_num, TEMP_IN);
	239	append_channel(sdi, cg, prb_num, TEMP_OUT);
	240	} else {
391e23a9	241	sr_err("Invalid probe type: %d.", type);
6b80b80d BG	242	}
	243
	244	sdi->channel_groups = g_slist_append(sdi->channel_groups, cg);
	245
	246	return TRUE;
	247	}
	248
61f2b7f7 BG	249	/*
	250	* Sets path to the hwmon attribute if this channel group
	251	* supports shunt resistance setting. The caller has to supply
	252	* a valid GString.
	253	*/
	254	static int get_shunt_path(const struct sr_channel_group cg, GString path)
	255	{
	256	struct channel_group_priv *cgp;
	257	int ret = SR_OK, status;
	258
	259	cgp = cg->priv;
	260
	261	if (cgp->probe_type != PROBE_ENRG) {
	262	sr_err("Probe doesn't support shunt resistance setting");
	263	return SR_ERR_ARG;
	264	}
	265
	266	g_string_append_printf(path,
	267	"/sys/class/hwmon/hwmon%d/shunt_resistor",
	268	cgp->hwmon_num);
	269
	270	/*
	271	* The shunt_resistor sysfs attribute is available
	272	* in the Linux kernel since version 3.20. We have
391e23a9	273	* to notify the user if this attribute is not present.
61f2b7f7 BG	274	*/
	275	status = g_file_test(path->str, G_FILE_TEST_EXISTS);
	276	if (!status) {
391e23a9	277	sr_err("shunt_resistance attribute not present, please update "
61f2b7f7 BG	278	"your kernel to version >=3.20");
	279	return SR_ERR_NA;
	280	}
	281
	282	return ret;
	283	}
	284
	285	SR_PRIV int bl_acme_get_shunt(const struct sr_channel_group *cg,
	286	uint64_t *shunt)
	287	{
	288	GString *path = g_string_sized_new(64);
	289	gchar *contents;
	290	int status, ret = SR_OK;
	291	GError *err = NULL;
	292
	293	status = get_shunt_path(cg, path);
	294	if (status != SR_OK) {
	295	ret = status;
	296	goto out;
	297	}
	298
	299	status = g_file_get_contents(path->str, &contents, NULL, &err);
	300	if (!status) {
	301	sr_err("Error reading shunt resistance: %s", err->message);
	302	ret = SR_ERR_IO;
	303	goto out;
	304	}
	305
	306	*shunt = UOHM_TO_MOHM(strtol(contents, NULL, 10));
	307
	308	out:
	309	g_string_free(path, TRUE);
	310	return ret;
	311	}
	312
391e23a9	313	SR_PRIV int bl_acme_set_shunt(const struct sr_channel_group *cg, uint64_t shunt)
61f2b7f7 BG	314	{
	315	GString *path = g_string_sized_new(64);;
	316	int status, ret = SR_OK;
	317	FILE *fd;
	318
	319	status = get_shunt_path(cg, path);
	320	if (status != SR_OK) {
	321	ret = status;
	322	goto out;
	323	}
	324
	325	/*
	326	* Can't use g_file_set_contents() here, as it calls open() with
	327	* O_EXEC flag in a sysfs directory thus failing with EACCES.
	328	*/
	329	fd = g_fopen(path->str, "w");
	330	if (!fd) {
	331	sr_err("Error opening %s: %s", path->str, strerror(errno));
	332	g_string_free(path, TRUE);
	333	return SR_ERR_IO;
	334	}
	335
	336	g_string_free(path, TRUE);
34527854	337	g_fprintf(fd, "%" PRIu64 "\n", MOHM_TO_UOHM(shunt));
61f2b7f7 BG	338	fclose(fd);
	339
	340	out:
	341	g_string_free(path, TRUE);
	342	return ret;
	343	}
	344
740ad48a BG	345	SR_PRIV int bl_acme_read_power_state(const struct sr_channel_group *cg,
	346	gboolean *off)
	347	{
	348	struct channel_group_priv *cgp;
	349	int val;
	350
	351	cgp = cg->priv;
	352
	353	val = sr_gpio_getval_export(pws_info_gpios[cgp->index]);
	354	if (val != 1) {
	355	sr_err("Probe has no power-switch");
	356	return SR_ERR_ARG;
	357	}
	358
	359	val = sr_gpio_getval_export(pws_gpios[cgp->index]);
	360	*off = val ? FALSE : TRUE;
	361
	362	return SR_OK;
	363	}
	364
	365	SR_PRIV int bl_acme_set_power_off(const struct sr_channel_group *cg,
	366	gboolean off)
	367	{
	368	struct channel_group_priv *cgp;
	369	int val;
	370
	371	cgp = cg->priv;
	372
	373	val = sr_gpio_getval_export(pws_info_gpios[cgp->index]);
	374	if (val != 1) {
	375	sr_err("Probe has no power-switch");
	376	return SR_ERR_ARG;
	377	}
	378
	379	val = sr_gpio_setval_export(pws_gpios[cgp->index], off ? 0 : 1);
	380
	381	return SR_OK;
	382	}
	383
6b80b80d	384	static int channel_to_mq(struct sr_channel *ch)
dfaee1de	385	{
6b80b80d BG	386	struct channel_priv *chp;
	387
	388	chp = ch->priv;
	389
	390	switch (chp->ch_type) {
	391	case ENRG_PWR:
	392	return SR_MQ_POWER;
	393	case ENRG_CURR:
	394	return SR_MQ_CURRENT;
	395	case ENRG_VOL:
	396	return SR_MQ_VOLTAGE;
391e23a9	397	case TEMP_IN: /* Fallthrough */
6b80b80d BG	398	case TEMP_OUT:
	399	return SR_MQ_TEMPERATURE;
	400	default:
	401	return -1;
	402	}
	403	}
	404
	405	static int channel_to_unit(struct sr_channel *ch)
	406	{
	407	struct channel_priv *chp;
	408
	409	chp = ch->priv;
	410
	411	switch (chp->ch_type) {
	412	case ENRG_PWR:
	413	return SR_UNIT_WATT;
	414	case ENRG_CURR:
	415	return SR_UNIT_AMPERE;
	416	case ENRG_VOL:
	417	return SR_UNIT_VOLT;
391e23a9	418	case TEMP_IN: /* Fallthrough */
6b80b80d BG	419	case TEMP_OUT:
	420	return SR_UNIT_CELSIUS;
	421	default:
	422	return -1;
	423	}
	424	}
	425
	426	/* We need to scale measurements down from the units used by the drivers. */
	427	static float adjust_data(int val, int type)
	428	{
	429	switch (type) {
	430	case ENRG_PWR:
	431	return ((float)val) / 1000000.0;
391e23a9 UH	432	case ENRG_CURR: /* Fallthrough */
	433	case ENRG_VOL: /* Fallthrough */
	434	case TEMP_IN: /* Fallthrough */
6b80b80d BG	435	case TEMP_OUT:
	436	return ((float)val) / 1000.0;
	437	default:
	438	return 0.0;
	439	}
	440	}
	441
	442	static float read_sample(struct sr_channel *ch)
	443	{
	444	struct channel_priv *chp;
	445	char path[64], *file, buf[16];
	446	ssize_t len;
	447	int fd;
	448
	449	chp = ch->priv;
	450
	451	switch (chp->ch_type) {
	452	case ENRG_PWR: file = "power1_input"; break;
	453	case ENRG_CURR: file = "curr1_input"; break;
	454	case ENRG_VOL: file = "in1_input"; break;
	455	case TEMP_IN: file = "temp1_input"; break;
	456	case TEMP_OUT: file = "temp2_input"; break;
	457	default:
391e23a9	458	sr_err("Invalid channel type: %d.", chp->ch_type);
6b80b80d BG	459	return -1.0;
	460	}
	461
391e23a9	462	snprintf(path, sizeof(path), "/sys/class/hwmon/hwmon%d/%s",
6b80b80d BG	463	chp->probe->hwmon_num, file);
	464	fd = open(path, O_RDONLY);
	465	if (fd < 0) {
	466	sr_err("Error opening %s: %s", path, strerror(errno));
	467	ch->enabled = FALSE;
	468	return -1.0;
	469	}
	470
	471	len = read(fd, buf, sizeof(buf));
	472	close(fd);
	473	if (len < 0) {
391e23a9	474	sr_err("Error reading from %s: %s", path, strerror(errno));
6b80b80d BG	475	ch->enabled = FALSE;
	476	return -1.0;
	477	}
	478
	479	return adjust_data(strtol(buf, NULL, 10), chp->ch_type);
	480	}
	481
	482	SR_PRIV int bl_acme_receive_data(int fd, int revents, void *cb_data)
	483	{
	484	uint32_t cur_time, elapsed_time, diff_time;
	485	int64_t time_to_sleep;
	486	struct sr_datafeed_packet packet, framep;
	487	struct sr_datafeed_analog analog;
	488	struct sr_dev_inst *sdi;
	489	struct sr_channel *ch;
dfaee1de	490	struct dev_context *devc;
6b80b80d BG	491	GSList *chl, chonly;
6b80b80d BG	492	float valf;
dfaee1de BG	493
dfaee1de BG	494	(void)fd;
6b80b80d BG	495	(void)revents;
	496
	497	sdi = cb_data;
	498	if (!sdi)
	499	return TRUE;
dfaee1de	500
6b80b80d BG	501	devc = sdi->priv;
6b80b80d BG	502	if (!devc)
dfaee1de BG	503	return TRUE;
dfaee1de BG	504
6b80b80d BG	505	packet.type = SR_DF_ANALOG;
	506	packet.payload = &analog;
	507	memset(&analog, 0, sizeof(analog));
	508	analog.data = &valf;
	509
	510	/*
391e23a9	511	* Reading from sysfs takes some time - try to keep up with samplerate.
6b80b80d BG	512	*/
	513	if (devc->samples_read) {
	514	cur_time = g_get_monotonic_time();
	515	diff_time = cur_time - devc->last_sample_fin;
	516	time_to_sleep = G_USEC_PER_SEC / devc->samplerate - diff_time;
	517	if (time_to_sleep > 0)
	518	g_usleep(time_to_sleep);
	519	}
	520
	521	framep.type = SR_DF_FRAME_BEGIN;
	522	sr_session_send(cb_data, &framep);
	523
	524	/*
	525	* Due to different units used in each channel we're sending
	526	* samples one-by-one.
	527	*/
	528	for (chl = sdi->channels; chl; chl = chl->next) {
	529	ch = chl->data;
	530	if (!ch->enabled)
	531	continue;
	532	chonly.next = NULL;
	533	chonly.data = ch;
	534	analog.channels = &chonly;
	535	analog.num_samples = 1;
	536	analog.mq = channel_to_mq(chl->data);
	537	analog.unit = channel_to_unit(ch);
	538
	539	valf = read_sample(ch);
	540
	541	sr_session_send(cb_data, &packet);
	542	}
	543
	544	framep.type = SR_DF_FRAME_END;
	545	sr_session_send(cb_data, &framep);
	546
	547	devc->samples_read++;
	548	if (devc->limit_samples > 0 &&
	549	devc->samples_read >= devc->limit_samples) {
	550	sr_info("Requested number of samples reached.");
	551	sdi->driver->dev_acquisition_stop(sdi, cb_data);
	552	devc->last_sample_fin = g_get_monotonic_time();
dfaee1de	553	return TRUE;
6b80b80d BG	554	} else if (devc->limit_msec > 0) {
	555	cur_time = g_get_monotonic_time();
	556	elapsed_time = cur_time - devc->start_time;
dfaee1de	557
6b80b80d BG	558	if (elapsed_time >= devc->limit_msec) {
	559	sr_info("Sampling time limit reached.");
	560	sdi->driver->dev_acquisition_stop(sdi, cb_data);
	561	devc->last_sample_fin = g_get_monotonic_time();
	562	return TRUE;
	563	}
dfaee1de BG	564	}
dfaee1de BG	565
6b80b80d	566	devc->last_sample_fin = g_get_monotonic_time();
dfaee1de BG	567	return TRUE;
dfaee1de BG	568	}