[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(sdi, devc->num_channels++,
			    SR_CHANNEL_ANALOG, TRUE, name);
	g_free(name);

	ch->priv = cp;
	cg->channels = g_slist_append(cg->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
5e23fcab	204	ch = sr_channel_new(sdi, devc->num_channels++,
6b80b80d BG	205	SR_CHANNEL_ANALOG, TRUE, name);
	206	g_free(name);
	207
	208	ch->priv = cp;
	209	cg->channels = g_slist_append(cg->channels, ch);
6b80b80d BG	210	}
	211
	212	SR_PRIV gboolean bl_acme_register_probe(struct sr_dev_inst *sdi, int type,
	213	unsigned int addr, int prb_num)
	214	{
	215	struct sr_channel_group *cg;
	216	struct channel_group_priv *cgp;
	217	int hwmon;
	218
	219	/* Obtain the hwmon index. */
	220	hwmon = get_hwmon_index(addr);
	221	if (hwmon < 0)
	222	return FALSE;
	223
	224	cg = g_malloc0(sizeof(struct sr_channel_group));
	225	cgp = g_malloc0(sizeof(struct channel_group_priv));
	226	cgp->hwmon_num = hwmon;
61f2b7f7	227	cgp->probe_type = type;
740ad48a	228	cgp->index = prb_num - 1;
6b80b80d BG	229	cg->name = g_strdup_printf("Probe_%d", prb_num);
	230	cg->priv = cgp;
	231
	232	if (type == PROBE_ENRG) {
	233	append_channel(sdi, cg, prb_num, ENRG_PWR);
	234	append_channel(sdi, cg, prb_num, ENRG_CURR);
	235	append_channel(sdi, cg, prb_num, ENRG_VOL);
	236	} else if (type == PROBE_TEMP) {
	237	append_channel(sdi, cg, prb_num, TEMP_IN);
	238	append_channel(sdi, cg, prb_num, TEMP_OUT);
	239	} else {
391e23a9	240	sr_err("Invalid probe type: %d.", type);
6b80b80d BG	241	}
	242
	243	sdi->channel_groups = g_slist_append(sdi->channel_groups, cg);
	244
	245	return TRUE;
	246	}
	247
61f2b7f7 BG	248	/*
	249	* Sets path to the hwmon attribute if this channel group
	250	* supports shunt resistance setting. The caller has to supply
	251	* a valid GString.
	252	*/
	253	static int get_shunt_path(const struct sr_channel_group cg, GString path)
	254	{
	255	struct channel_group_priv *cgp;
	256	int ret = SR_OK, status;
	257
	258	cgp = cg->priv;
	259
	260	if (cgp->probe_type != PROBE_ENRG) {
	261	sr_err("Probe doesn't support shunt resistance setting");
	262	return SR_ERR_ARG;
	263	}
	264
	265	g_string_append_printf(path,
	266	"/sys/class/hwmon/hwmon%d/shunt_resistor",
	267	cgp->hwmon_num);
	268
	269	/*
	270	* The shunt_resistor sysfs attribute is available
	271	* in the Linux kernel since version 3.20. We have
391e23a9	272	* to notify the user if this attribute is not present.
61f2b7f7 BG	273	*/
	274	status = g_file_test(path->str, G_FILE_TEST_EXISTS);
	275	if (!status) {
391e23a9	276	sr_err("shunt_resistance attribute not present, please update "
61f2b7f7 BG	277	"your kernel to version >=3.20");
	278	return SR_ERR_NA;
	279	}
	280
	281	return ret;
	282	}
	283
	284	SR_PRIV int bl_acme_get_shunt(const struct sr_channel_group *cg,
	285	uint64_t *shunt)
	286	{
	287	GString *path = g_string_sized_new(64);
	288	gchar *contents;
	289	int status, ret = SR_OK;
	290	GError *err = NULL;
	291
	292	status = get_shunt_path(cg, path);
	293	if (status != SR_OK) {
	294	ret = status;
	295	goto out;
	296	}
	297
	298	status = g_file_get_contents(path->str, &contents, NULL, &err);
	299	if (!status) {
	300	sr_err("Error reading shunt resistance: %s", err->message);
	301	ret = SR_ERR_IO;
	302	goto out;
	303	}
	304
	305	*shunt = UOHM_TO_MOHM(strtol(contents, NULL, 10));
	306
	307	out:
	308	g_string_free(path, TRUE);
	309	return ret;
	310	}
	311
391e23a9	312	SR_PRIV int bl_acme_set_shunt(const struct sr_channel_group *cg, uint64_t shunt)
61f2b7f7 BG	313	{
	314	GString *path = g_string_sized_new(64);;
	315	int status, ret = SR_OK;
	316	FILE *fd;
	317
	318	status = get_shunt_path(cg, path);
	319	if (status != SR_OK) {
	320	ret = status;
	321	goto out;
	322	}
	323
	324	/*
	325	* Can't use g_file_set_contents() here, as it calls open() with
	326	* O_EXEC flag in a sysfs directory thus failing with EACCES.
	327	*/
	328	fd = g_fopen(path->str, "w");
	329	if (!fd) {
	330	sr_err("Error opening %s: %s", path->str, strerror(errno));
	331	g_string_free(path, TRUE);
	332	return SR_ERR_IO;
	333	}
	334
	335	g_string_free(path, TRUE);
34527854	336	g_fprintf(fd, "%" PRIu64 "\n", MOHM_TO_UOHM(shunt));
61f2b7f7 BG	337	fclose(fd);
	338
	339	out:
	340	g_string_free(path, TRUE);
	341	return ret;
	342	}
	343
740ad48a BG	344	SR_PRIV int bl_acme_read_power_state(const struct sr_channel_group *cg,
	345	gboolean *off)
	346	{
	347	struct channel_group_priv *cgp;
	348	int val;
	349
	350	cgp = cg->priv;
	351
	352	val = sr_gpio_getval_export(pws_info_gpios[cgp->index]);
	353	if (val != 1) {
	354	sr_err("Probe has no power-switch");
	355	return SR_ERR_ARG;
	356	}
	357
	358	val = sr_gpio_getval_export(pws_gpios[cgp->index]);
	359	*off = val ? FALSE : TRUE;
	360
	361	return SR_OK;
	362	}
	363
	364	SR_PRIV int bl_acme_set_power_off(const struct sr_channel_group *cg,
	365	gboolean off)
	366	{
	367	struct channel_group_priv *cgp;
	368	int val;
	369
	370	cgp = cg->priv;
	371
	372	val = sr_gpio_getval_export(pws_info_gpios[cgp->index]);
	373	if (val != 1) {
	374	sr_err("Probe has no power-switch");
	375	return SR_ERR_ARG;
	376	}
	377
	378	val = sr_gpio_setval_export(pws_gpios[cgp->index], off ? 0 : 1);
	379
	380	return SR_OK;
	381	}
	382
6b80b80d	383	static int channel_to_mq(struct sr_channel *ch)
dfaee1de	384	{
6b80b80d BG	385	struct channel_priv *chp;
	386
	387	chp = ch->priv;
	388
	389	switch (chp->ch_type) {
	390	case ENRG_PWR:
	391	return SR_MQ_POWER;
	392	case ENRG_CURR:
	393	return SR_MQ_CURRENT;
	394	case ENRG_VOL:
	395	return SR_MQ_VOLTAGE;
391e23a9	396	case TEMP_IN: /* Fallthrough */
6b80b80d BG	397	case TEMP_OUT:
	398	return SR_MQ_TEMPERATURE;
	399	default:
	400	return -1;
	401	}
	402	}
	403
	404	static int channel_to_unit(struct sr_channel *ch)
	405	{
	406	struct channel_priv *chp;
	407
	408	chp = ch->priv;
	409
	410	switch (chp->ch_type) {
	411	case ENRG_PWR:
	412	return SR_UNIT_WATT;
	413	case ENRG_CURR:
	414	return SR_UNIT_AMPERE;
	415	case ENRG_VOL:
	416	return SR_UNIT_VOLT;
391e23a9	417	case TEMP_IN: /* Fallthrough */
6b80b80d BG	418	case TEMP_OUT:
	419	return SR_UNIT_CELSIUS;
	420	default:
	421	return -1;
	422	}
	423	}
	424
	425	/* We need to scale measurements down from the units used by the drivers. */
	426	static float adjust_data(int val, int type)
	427	{
	428	switch (type) {
	429	case ENRG_PWR:
	430	return ((float)val) / 1000000.0;
391e23a9 UH	431	case ENRG_CURR: /* Fallthrough */
	432	case ENRG_VOL: /* Fallthrough */
	433	case TEMP_IN: /* Fallthrough */
6b80b80d BG	434	case TEMP_OUT:
	435	return ((float)val) / 1000.0;
	436	default:
	437	return 0.0;
	438	}
	439	}
	440
	441	static float read_sample(struct sr_channel *ch)
	442	{
	443	struct channel_priv *chp;
	444	char path[64], *file, buf[16];
	445	ssize_t len;
	446	int fd;
	447
	448	chp = ch->priv;
	449
	450	switch (chp->ch_type) {
	451	case ENRG_PWR: file = "power1_input"; break;
	452	case ENRG_CURR: file = "curr1_input"; break;
	453	case ENRG_VOL: file = "in1_input"; break;
	454	case TEMP_IN: file = "temp1_input"; break;
	455	case TEMP_OUT: file = "temp2_input"; break;
	456	default:
391e23a9	457	sr_err("Invalid channel type: %d.", chp->ch_type);
6b80b80d BG	458	return -1.0;
	459	}
	460
391e23a9	461	snprintf(path, sizeof(path), "/sys/class/hwmon/hwmon%d/%s",
6b80b80d BG	462	chp->probe->hwmon_num, file);
	463	fd = open(path, O_RDONLY);
	464	if (fd < 0) {
	465	sr_err("Error opening %s: %s", path, strerror(errno));
	466	ch->enabled = FALSE;
	467	return -1.0;
	468	}
	469
	470	len = read(fd, buf, sizeof(buf));
	471	close(fd);
	472	if (len < 0) {
391e23a9	473	sr_err("Error reading from %s: %s", path, strerror(errno));
6b80b80d BG	474	ch->enabled = FALSE;
	475	return -1.0;
	476	}
	477
	478	return adjust_data(strtol(buf, NULL, 10), chp->ch_type);
	479	}
	480
	481	SR_PRIV int bl_acme_receive_data(int fd, int revents, void *cb_data)
	482	{
	483	uint32_t cur_time, elapsed_time, diff_time;
	484	int64_t time_to_sleep;
	485	struct sr_datafeed_packet packet, framep;
	486	struct sr_datafeed_analog analog;
	487	struct sr_dev_inst *sdi;
	488	struct sr_channel *ch;
dfaee1de	489	struct dev_context *devc;
6b80b80d BG	490	GSList *chl, chonly;
6b80b80d BG	491	float valf;
dfaee1de BG	492
dfaee1de BG	493	(void)fd;
6b80b80d BG	494	(void)revents;
	495
	496	sdi = cb_data;
	497	if (!sdi)
	498	return TRUE;
dfaee1de	499
6b80b80d BG	500	devc = sdi->priv;
6b80b80d BG	501	if (!devc)
dfaee1de BG	502	return TRUE;
dfaee1de BG	503
6b80b80d BG	504	packet.type = SR_DF_ANALOG;
	505	packet.payload = &analog;
	506	memset(&analog, 0, sizeof(analog));
	507	analog.data = &valf;
	508
	509	/*
391e23a9	510	* Reading from sysfs takes some time - try to keep up with samplerate.
6b80b80d BG	511	*/
	512	if (devc->samples_read) {
	513	cur_time = g_get_monotonic_time();
	514	diff_time = cur_time - devc->last_sample_fin;
	515	time_to_sleep = G_USEC_PER_SEC / devc->samplerate - diff_time;
	516	if (time_to_sleep > 0)
	517	g_usleep(time_to_sleep);
	518	}
	519
	520	framep.type = SR_DF_FRAME_BEGIN;
	521	sr_session_send(cb_data, &framep);
	522
	523	/*
	524	* Due to different units used in each channel we're sending
	525	* samples one-by-one.
	526	*/
	527	for (chl = sdi->channels; chl; chl = chl->next) {
	528	ch = chl->data;
	529	if (!ch->enabled)
	530	continue;
	531	chonly.next = NULL;
	532	chonly.data = ch;
	533	analog.channels = &chonly;
	534	analog.num_samples = 1;
	535	analog.mq = channel_to_mq(chl->data);
	536	analog.unit = channel_to_unit(ch);
	537
	538	valf = read_sample(ch);
	539
	540	sr_session_send(cb_data, &packet);
	541	}
	542
	543	framep.type = SR_DF_FRAME_END;
	544	sr_session_send(cb_data, &framep);
	545
	546	devc->samples_read++;
	547	if (devc->limit_samples > 0 &&
	548	devc->samples_read >= devc->limit_samples) {
	549	sr_info("Requested number of samples reached.");
	550	sdi->driver->dev_acquisition_stop(sdi, cb_data);
	551	devc->last_sample_fin = g_get_monotonic_time();
dfaee1de	552	return TRUE;
6b80b80d BG	553	} else if (devc->limit_msec > 0) {
	554	cur_time = g_get_monotonic_time();
	555	elapsed_time = cur_time - devc->start_time;
dfaee1de	556
6b80b80d BG	557	if (elapsed_time >= devc->limit_msec) {
	558	sr_info("Sampling time limit reached.");
	559	sdi->driver->dev_acquisition_stop(sdi, cb_data);
	560	devc->last_sample_fin = g_get_monotonic_time();
	561	return TRUE;
	562	}
dfaee1de BG	563	}
dfaee1de BG	564
6b80b80d	565	devc->last_sample_fin = g_get_monotonic_time();
dfaee1de BG	566	return TRUE;
dfaee1de BG	567	}