[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> /* strtol() */
#include <errno.h>
#include <fcntl.h> /* open(), etc... */
#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)) == 0) {
		/*
		 * 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 == NULL) {
		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("Bug in the code: invalid channel 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("Bug in the code: invalid probe 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, "%llu\n", MOHM_TO_UOHM(shunt));
	/*
	 * XXX There's no g_fclose() in GLib. This seems to work,
	 * but is it safe?
	 */
	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:
	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:
	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:
	case ENRG_VOL:
	case TEMP_IN:
	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("Bug in the code: invalid channel 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 BG	20	#include <string.h>
	21	#include <stdlib.h> /* strtol() */
	22	#include <errno.h>
	23	#include <fcntl.h> /* open(), etc... */
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 BG	47	static const uint32_t pws_gpios[] = {
	48	486, 498, 502, 482, 478, 506, 510, 474
	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;
	117
	118	}
	119
	120	if (strncmp(buf, prb_name, strlen(prb_name)) == 0) {
	121	/*
122	* Correct driver registered on this address - but is
123	* there an actual probe connected?
124	*/
125	probe_hwmon_path(addr, path);
126	status = g_file_test(path->str, G_FILE_TEST_IS_DIR);
127	if (status) {
128	/* We have found an ACME probe. */
129	ret = TRUE;
130	}
131	}
132
133	g_free(buf);
134	g_string_free(path, TRUE);
135
136	return ret;
137	}
138
139	static int get_hwmon_index(unsigned int addr)
140	{
141	int status, hwmon;
142	GString *path = g_string_sized_new(64);
143	GError *err = NULL;
144	GDir *dir;
145
146	probe_hwmon_path(addr, path);
147	dir = g_dir_open(path->str, 0, &err);
148	if (dir == NULL) {
149	sr_err("Error opening %s: %s", path->str, err->message);
150	g_string_free(path, TRUE);
151	return -1;
152	}
153
154	g_string_free(path, TRUE);
155
156	/*
157	* The directory should contain a single file named hwmonX where X
158	* is the hwmon index.
159	*/
160	status = sscanf(g_dir_read_name(dir), "hwmon%d", &hwmon);
161	g_dir_close(dir);
162	if (status != 1) {
163	sr_err("Unable to determine the hwmon entry");
164	return -1;
165	}
166
167	return hwmon;
168	}
169
170	static void append_channel(struct sr_dev_inst *sdi,
171	struct sr_channel_group *cg,
172	int index, int type)
173	{
174	struct channel_priv *cp;
175	struct dev_context *devc;
176	struct sr_channel *ch;
177	char *name;
178
179	devc = sdi->priv;
180
181	switch (type) {
182	case ENRG_PWR:
183	name = g_strdup_printf("P%d_ENRG_PWR", index);
184	break;
185	case ENRG_CURR:
186	name = g_strdup_printf("P%d_ENRG_CURR", index);
187	break;
188	case ENRG_VOL:
189	name = g_strdup_printf("P%d_ENRG_VOL", index);
190	break;
191	case TEMP_IN:
192	name = g_strdup_printf("P%d_TEMP_IN", index);
193	break;
194	case TEMP_OUT:
195	name = g_strdup_printf("P%d_TEMP_OUT", index);
196	break;
197	default:
198	sr_err("Bug in the code: invalid channel type!");
199	return;
200	}
201
202	cp = g_malloc0(sizeof(struct channel_priv));
203	cp->ch_type = type;
204	cp->probe = cg->priv;
205
206	ch = sr_channel_new(devc->num_channels++,
207	SR_CHANNEL_ANALOG, TRUE, name);
208	g_free(name);
209
210	ch->priv = cp;
211	cg->channels = g_slist_append(cg->channels, ch);
212	sdi->channels = g_slist_append(sdi->channels, ch);
213	}
214
215	SR_PRIV gboolean bl_acme_register_probe(struct sr_dev_inst *sdi, int type,
216	unsigned int addr, int prb_num)
217	{
218	struct sr_channel_group *cg;
219	struct channel_group_priv *cgp;
220	int hwmon;
221
222	/* Obtain the hwmon index. */
223	hwmon = get_hwmon_index(addr);
224	if (hwmon < 0)
225	return FALSE;
226
227	cg = g_malloc0(sizeof(struct sr_channel_group));
228	cgp = g_malloc0(sizeof(struct channel_group_priv));
229	cgp->hwmon_num = hwmon;
61f2b7f7	230	cgp->probe_type = type;
740ad48a	231	cgp->index = prb_num - 1;
6b80b80d BG	232	cg->name = g_strdup_printf("Probe_%d", prb_num);
	233	cg->priv = cgp;
	234
	235	if (type == PROBE_ENRG) {
	236	append_channel(sdi, cg, prb_num, ENRG_PWR);
	237	append_channel(sdi, cg, prb_num, ENRG_CURR);
	238	append_channel(sdi, cg, prb_num, ENRG_VOL);
	239	} else if (type == PROBE_TEMP) {
	240	append_channel(sdi, cg, prb_num, TEMP_IN);
	241	append_channel(sdi, cg, prb_num, TEMP_OUT);
	242	} else {
	243	sr_err("Bug in the code: invalid probe type!");
	244	}
	245
	246	sdi->channel_groups = g_slist_append(sdi->channel_groups, cg);
	247
	248	return TRUE;
	249	}
	250
61f2b7f7 BG	251	/*
	252	* Sets path to the hwmon attribute if this channel group
	253	* supports shunt resistance setting. The caller has to supply
	254	* a valid GString.
	255	*/
	256	static int get_shunt_path(const struct sr_channel_group cg, GString path)
	257	{
	258	struct channel_group_priv *cgp;
	259	int ret = SR_OK, status;
	260
	261	cgp = cg->priv;
	262
	263	if (cgp->probe_type != PROBE_ENRG) {
	264	sr_err("Probe doesn't support shunt resistance setting");
	265	return SR_ERR_ARG;
	266	}
	267
	268	g_string_append_printf(path,
	269	"/sys/class/hwmon/hwmon%d/shunt_resistor",
	270	cgp->hwmon_num);
	271
	272	/*
	273	* The shunt_resistor sysfs attribute is available
	274	* in the Linux kernel since version 3.20. We have
	275	* to notify the user if this attribute is not
	276	* present.
	277	*/
	278	status = g_file_test(path->str, G_FILE_TEST_EXISTS);
	279	if (!status) {
	280	sr_err("shunt_resistance attribute not present please update "
	281	"your kernel to version >=3.20");
	282	return SR_ERR_NA;
	283	}
	284
	285	return ret;
	286	}
	287
	288	SR_PRIV int bl_acme_get_shunt(const struct sr_channel_group *cg,
	289	uint64_t *shunt)
	290	{
	291	GString *path = g_string_sized_new(64);
	292	gchar *contents;
	293	int status, ret = SR_OK;
	294	GError *err = NULL;
	295
	296	status = get_shunt_path(cg, path);
	297	if (status != SR_OK) {
	298	ret = status;
	299	goto out;
	300	}
	301
	302	status = g_file_get_contents(path->str, &contents, NULL, &err);
	303	if (!status) {
	304	sr_err("Error reading shunt resistance: %s", err->message);
	305	ret = SR_ERR_IO;
	306	goto out;
	307	}
	308
	309	*shunt = UOHM_TO_MOHM(strtol(contents, NULL, 10));
	310
	311	out:
	312	g_string_free(path, TRUE);
	313	return ret;
	314	}
315
316	SR_PRIV int bl_acme_set_shunt(const struct sr_channel_group *cg,
317	uint64_t shunt)
318	{
319	GString *path = g_string_sized_new(64);;
320	int status, ret = SR_OK;
321	FILE *fd;
322
323	status = get_shunt_path(cg, path);
324	if (status != SR_OK) {
325	ret = status;
326	goto out;
327	}
328
329	/*
330	* Can't use g_file_set_contents() here, as it calls open() with
331	* O_EXEC flag in a sysfs directory thus failing with EACCES.
332	*/
333	fd = g_fopen(path->str, "w");
334	if (!fd) {
335	sr_err("Error opening %s: %s", path->str, strerror(errno));
336	g_string_free(path, TRUE);
337	return SR_ERR_IO;
338	}
339
340	g_string_free(path, TRUE);
341	g_fprintf(fd, "%llu\n", MOHM_TO_UOHM(shunt));
342	/*
343	* XXX There's no g_fclose() in GLib. This seems to work,
344	* but is it safe?
345	*/
346	fclose(fd);
347
348	out:
349	g_string_free(path, TRUE);
350	return ret;
351	}
352
740ad48a BG	353	SR_PRIV int bl_acme_read_power_state(const struct sr_channel_group *cg,
	354	gboolean *off)
	355	{
	356	struct channel_group_priv *cgp;
	357	int val;
	358
	359	cgp = cg->priv;
	360
	361	val = sr_gpio_getval_export(pws_info_gpios[cgp->index]);
	362	if (val != 1) {
	363	sr_err("Probe has no power-switch");
	364	return SR_ERR_ARG;
	365	}
	366
	367	val = sr_gpio_getval_export(pws_gpios[cgp->index]);
	368	*off = val ? FALSE : TRUE;
	369
	370	return SR_OK;
	371	}
	372
	373	SR_PRIV int bl_acme_set_power_off(const struct sr_channel_group *cg,
	374	gboolean off)
	375	{
	376	struct channel_group_priv *cgp;
	377	int val;
	378
	379	cgp = cg->priv;
	380
	381	val = sr_gpio_getval_export(pws_info_gpios[cgp->index]);
	382	if (val != 1) {
	383	sr_err("Probe has no power-switch");
	384	return SR_ERR_ARG;
	385	}
	386
	387	val = sr_gpio_setval_export(pws_gpios[cgp->index], off ? 0 : 1);
	388
	389	return SR_OK;
	390	}
	391
6b80b80d	392	static int channel_to_mq(struct sr_channel *ch)
dfaee1de	393	{
6b80b80d BG	394	struct channel_priv *chp;
	395
	396	chp = ch->priv;
	397
	398	switch (chp->ch_type) {
	399	case ENRG_PWR:
	400	return SR_MQ_POWER;
	401	case ENRG_CURR:
	402	return SR_MQ_CURRENT;
	403	case ENRG_VOL:
	404	return SR_MQ_VOLTAGE;
	405	case TEMP_IN:
	406	case TEMP_OUT:
	407	return SR_MQ_TEMPERATURE;
	408	default:
	409	return -1;
	410	}
	411	}
	412
	413	static int channel_to_unit(struct sr_channel *ch)
	414	{
	415	struct channel_priv *chp;
	416
	417	chp = ch->priv;
	418
	419	switch (chp->ch_type) {
	420	case ENRG_PWR:
	421	return SR_UNIT_WATT;
	422	case ENRG_CURR:
	423	return SR_UNIT_AMPERE;
	424	case ENRG_VOL:
	425	return SR_UNIT_VOLT;
	426	case TEMP_IN:
	427	case TEMP_OUT:
	428	return SR_UNIT_CELSIUS;
	429	default:
	430	return -1;
	431	}
	432	}
	433
	434	/* We need to scale measurements down from the units used by the drivers. */
	435	static float adjust_data(int val, int type)
	436	{
	437	switch (type) {
	438	case ENRG_PWR:
	439	return ((float)val) / 1000000.0;
	440	case ENRG_CURR:
	441	case ENRG_VOL:
	442	case TEMP_IN:
	443	case TEMP_OUT:
	444	return ((float)val) / 1000.0;
	445	default:
	446	return 0.0;
	447	}
	448	}
	449
	450	static float read_sample(struct sr_channel *ch)
	451	{
	452	struct channel_priv *chp;
	453	char path[64], *file, buf[16];
	454	ssize_t len;
	455	int fd;
	456
	457	chp = ch->priv;
458
459	switch (chp->ch_type) {
460	case ENRG_PWR: file = "power1_input"; break;
461	case ENRG_CURR: file = "curr1_input"; break;
462	case ENRG_VOL: file = "in1_input"; break;
463	case TEMP_IN: file = "temp1_input"; break;
464	case TEMP_OUT: file = "temp2_input"; break;
465	default:
466	sr_err("Bug in the code: invalid channel type!");
467	return -1.0;
468	}
469
470	snprintf(path, sizeof(path),
471	"/sys/class/hwmon/hwmon%d/%s",
472	chp->probe->hwmon_num, file);
473	fd = open(path, O_RDONLY);
474	if (fd < 0) {
475	sr_err("Error opening %s: %s", path, strerror(errno));
476	ch->enabled = FALSE;
477	return -1.0;
478	}
479
480	len = read(fd, buf, sizeof(buf));
481	close(fd);
482	if (len < 0) {
483	sr_err("error reading from %s: %s", path, strerror(errno));
484	ch->enabled = FALSE;
485	return -1.0;
486	}
487
488	return adjust_data(strtol(buf, NULL, 10), chp->ch_type);
489	}
490
491	SR_PRIV int bl_acme_receive_data(int fd, int revents, void *cb_data)
492	{
493	uint32_t cur_time, elapsed_time, diff_time;
494	int64_t time_to_sleep;
495	struct sr_datafeed_packet packet, framep;
496	struct sr_datafeed_analog analog;
497	struct sr_dev_inst *sdi;
498	struct sr_channel *ch;
dfaee1de	499	struct dev_context *devc;
6b80b80d BG	500	GSList *chl, chonly;
6b80b80d BG	501	float valf;
dfaee1de BG	502
dfaee1de BG	503	(void)fd;
6b80b80d BG	504	(void)revents;
	505
	506	sdi = cb_data;
	507	if (!sdi)
	508	return TRUE;
dfaee1de	509
6b80b80d BG	510	devc = sdi->priv;
6b80b80d BG	511	if (!devc)
dfaee1de BG	512	return TRUE;
dfaee1de BG	513
6b80b80d BG	514	packet.type = SR_DF_ANALOG;
	515	packet.payload = &analog;
	516	memset(&analog, 0, sizeof(analog));
	517	analog.data = &valf;
	518
	519	/*
	520	* Reading from sysfs takes some time - try to
	521	* keep up with samplerate.
	522	*/
	523	if (devc->samples_read) {
	524	cur_time = g_get_monotonic_time();
	525	diff_time = cur_time - devc->last_sample_fin;
	526	time_to_sleep = G_USEC_PER_SEC / devc->samplerate - diff_time;
	527	if (time_to_sleep > 0)
	528	g_usleep(time_to_sleep);
	529	}
	530
	531	framep.type = SR_DF_FRAME_BEGIN;
	532	sr_session_send(cb_data, &framep);
	533
	534	/*
	535	* Due to different units used in each channel we're sending
	536	* samples one-by-one.
	537	*/
	538	for (chl = sdi->channels; chl; chl = chl->next) {
	539	ch = chl->data;
	540	if (!ch->enabled)
	541	continue;
	542	chonly.next = NULL;
	543	chonly.data = ch;
	544	analog.channels = &chonly;
	545	analog.num_samples = 1;
	546	analog.mq = channel_to_mq(chl->data);
	547	analog.unit = channel_to_unit(ch);
	548
	549	valf = read_sample(ch);
	550
	551	sr_session_send(cb_data, &packet);
	552	}
	553
	554	framep.type = SR_DF_FRAME_END;
	555	sr_session_send(cb_data, &framep);
	556
	557	devc->samples_read++;
	558	if (devc->limit_samples > 0 &&
	559	devc->samples_read >= devc->limit_samples) {
	560	sr_info("Requested number of samples reached.");
	561	sdi->driver->dev_acquisition_stop(sdi, cb_data);
	562	devc->last_sample_fin = g_get_monotonic_time();
dfaee1de	563	return TRUE;
6b80b80d BG	564	} else if (devc->limit_msec > 0) {
	565	cur_time = g_get_monotonic_time();
	566	elapsed_time = cur_time - devc->start_time;
dfaee1de	567
6b80b80d BG	568	if (elapsed_time >= devc->limit_msec) {
	569	sr_info("Sampling time limit reached.");
	570	sdi->driver->dev_acquisition_stop(sdi, cb_data);
	571	devc->last_sample_fin = g_get_monotonic_time();
	572	return TRUE;
	573	}
dfaee1de BG	574	}
dfaee1de BG	575
6b80b80d	576	devc->last_sample_fin = g_get_monotonic_time();
dfaee1de BG	577	return TRUE;
dfaee1de BG	578	}