[libsigrok.git] / src / hardware / brymen-bm86x / protocol.c

/*
 * This file is part of the libsigrok project.
 *
 * Copyright (C) 2014 Aurelien Jacobs <aurel@gnuage.org>
 *
 * 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 <config.h>
#include <string.h>
#include <math.h>
#include "protocol.h"

#define USB_TIMEOUT 500

static const char char_map[128] = {
	[0x20] = '-',
	[0x5F] = '0',
	[0x50] = '1',
	[0x6D] = '2',
	[0x7C] = '3',
	[0x72] = '4',
	[0x3E] = '5',
	[0x3F] = '6',
	[0x54] = '7',
	[0x7F] = '8',
	[0x7E] = '9',
	[0x0F] = 'C',
	[0x27] = 'F',
	[0x0B] = 'L',
	[0x79] = 'd',
	[0x10] = 'i',
	[0x39] = 'o',
};

static int brymen_bm86x_parse_digits(const unsigned char *buf, int length,
                                     char *str, float *floatval,
                                     char *temp_unit, int flag)
{
	char c, *p = str;
	int i, ret;

	if (buf[0] & flag)
		*p++ = '-';
	for (i = 0; i < length; i++) {
		if (i && i < 5 && buf[i+1] & 0x01)
			*p++ = '.';
		c = char_map[buf[i+1] >> 1];
		if (i == 5 && (c == 'C' || c == 'F'))
			*temp_unit = c;
		else if (c)
			*p++ = c;
	}
	*p = 0;

	if ((ret = sr_atof_ascii(str, floatval))) {
		sr_dbg("invalid float string: '%s'", str);
		return ret;
	}

	return SR_OK;
}

static void brymen_bm86x_parse(unsigned char *buf, float *floatval,
                               struct sr_datafeed_analog *analog)
{
	char str[16], temp_unit;
	int ret1, ret2, over_limit;

	ret1 = brymen_bm86x_parse_digits(buf+2, 6, str, &floatval[0],
	                                 &temp_unit, 0x80);
	over_limit = strstr(str, "0L") || strstr(str, "0.L");
	ret2 = brymen_bm86x_parse_digits(buf+9, 4, str, &floatval[1],
	                                 &temp_unit, 0x10);

	/* main display */
	if (ret1 == SR_OK || over_limit) {
		/* SI unit */
		if (buf[8] & 0x01) {
			analog[0].mq = SR_MQ_VOLTAGE;
			analog[0].unit = SR_UNIT_VOLT;
			if (!strcmp(str, "diod"))
				analog[0].mqflags |= SR_MQFLAG_DIODE;
		} else if (buf[14] & 0x80) {
			analog[0].mq = SR_MQ_CURRENT;
			analog[0].unit = SR_UNIT_AMPERE;
		} else if (buf[14] & 0x20) {
			analog[0].mq = SR_MQ_CAPACITANCE;
			analog[0].unit = SR_UNIT_FARAD;
		} else if (buf[14] & 0x10) {
			analog[0].mq = SR_MQ_CONDUCTANCE;
			analog[0].unit = SR_UNIT_SIEMENS;
		} else if (buf[15] & 0x01) {
			analog[0].mq = SR_MQ_FREQUENCY;
			analog[0].unit = SR_UNIT_HERTZ;
		} else if (buf[10] & 0x01) {
			analog[0].mq = SR_MQ_CONTINUITY;
			analog[0].unit = SR_UNIT_OHM;
		} else if (buf[15] & 0x10) {
			analog[0].mq = SR_MQ_RESISTANCE;
			analog[0].unit = SR_UNIT_OHM;
		} else if (buf[15] & 0x02) {
			analog[0].mq = SR_MQ_POWER;
			analog[0].unit = SR_UNIT_DECIBEL_MW;
		} else if (buf[15] & 0x80) {
			analog[0].mq = SR_MQ_DUTY_CYCLE;
			analog[0].unit = SR_UNIT_PERCENTAGE;
		} else if (buf[ 2] & 0x0A) {
			analog[0].mq = SR_MQ_TEMPERATURE;
			if (temp_unit == 'F')
				analog[0].unit = SR_UNIT_FAHRENHEIT;
			else
				analog[0].unit = SR_UNIT_CELSIUS;
		}

		/* when MIN MAX and AVG are displayed at the same time, remove them */
		if ((buf[1] & 0xE0) == 0xE0)
			buf[1] &= ~0xE0;

		/* AC/DC/Auto flags */
		if (buf[1] & 0x10)  analog[0].mqflags |= SR_MQFLAG_DC;
		if (buf[2] & 0x01)  analog[0].mqflags |= SR_MQFLAG_AC;
		if (buf[1] & 0x01)  analog[0].mqflags |= SR_MQFLAG_AUTORANGE;
		if (buf[1] & 0x08)  analog[0].mqflags |= SR_MQFLAG_HOLD;
		if (buf[1] & 0x20)  analog[0].mqflags |= SR_MQFLAG_MAX;
		if (buf[1] & 0x40)  analog[0].mqflags |= SR_MQFLAG_MIN;
		if (buf[1] & 0x80)  analog[0].mqflags |= SR_MQFLAG_AVG;
		if (buf[3] & 0x01)  analog[0].mqflags |= SR_MQFLAG_RELATIVE;

		/* when dBm is displayed, remove the m suffix so that it is
		   not considered as the 10e-3 SI prefix */
		if (buf[15] & 0x02)
			buf[15] &= ~0x04;

		/* SI prefix */
		if (buf[14] & 0x40)  floatval[0] *= 1e-9;  /* n */
		if (buf[15] & 0x08)  floatval[0] *= 1e-6;  /* µ */
		if (buf[15] & 0x04)  floatval[0] *= 1e-3;  /* m */
		if (buf[15] & 0x40)  floatval[0] *= 1e3;   /* k */
		if (buf[15] & 0x20)  floatval[0] *= 1e6;   /* M */

		if (over_limit)      floatval[0] = INFINITY;
	}

	/* secondary display */
	if (ret2 == SR_OK) {
		/* SI unit */
		if (buf[14] & 0x08) {
			analog[1].mq = SR_MQ_VOLTAGE;
			analog[1].unit = SR_UNIT_VOLT;
		} else if (buf[9] & 0x04) {
			analog[1].mq = SR_MQ_CURRENT;
			analog[1].unit = SR_UNIT_AMPERE;
		} else if (buf[9] & 0x08) {
			analog[1].mq = SR_MQ_CURRENT;
			analog[1].unit = SR_UNIT_PERCENTAGE;
		} else if (buf[14] & 0x04) {
			analog[1].mq = SR_MQ_FREQUENCY;
			analog[1].unit = SR_UNIT_HERTZ;
		} else if (buf[9] & 0x40) {
			analog[1].mq = SR_MQ_TEMPERATURE;
			if (temp_unit == 'F')
				analog[1].unit = SR_UNIT_FAHRENHEIT;
			else
				analog[1].unit = SR_UNIT_CELSIUS;
		}

		/* AC flag */
		if (buf[9] & 0x20)  analog[1].mqflags |= SR_MQFLAG_AC;

		/* SI prefix */
		if (buf[ 9] & 0x01)  floatval[1] *= 1e-6;  /* µ */
		if (buf[ 9] & 0x02)  floatval[1] *= 1e-3;  /* m */
		if (buf[14] & 0x02)  floatval[1] *= 1e3;   /* k */
		if (buf[14] & 0x01)  floatval[1] *= 1e6;   /* M */
	}

	if (buf[9] & 0x80)
		sr_spew("Battery is low.");
}

static void brymen_bm86x_handle_packet(const struct sr_dev_inst *sdi,
                                       unsigned char *buf)
{
	struct dev_context *devc;
	struct sr_datafeed_packet packet;
	struct sr_datafeed_analog analog[2];
	float floatval[2];

	devc = sdi->priv;

	analog[0].mq = -1;
	analog[0].mqflags = 0;

	analog[1].mq = -1;
	analog[1].mqflags = 0;

	brymen_bm86x_parse(buf, floatval, analog);

	if (analog[0].mq != -1) {
		/* Got a measurement. */
		analog[0].num_samples = 1;
		analog[0].data = &floatval[0];
		analog[0].channels = g_slist_append(NULL, sdi->channels->data);
		packet.type = SR_DF_ANALOG;
		packet.payload = &analog[0];
		sr_session_send(sdi, &packet);
		g_slist_free(analog[0].channels);
	}

	if (analog[1].mq != -1) {
		/* Got a measurement. */
		analog[1].num_samples = 1;
		analog[1].data = &floatval[1];
		analog[1].channels = g_slist_append(NULL, sdi->channels->next->data);
		packet.type = SR_DF_ANALOG;
		packet.payload = &analog[1];
		sr_session_send(sdi, &packet);
		g_slist_free(analog[1].channels);
	}

	if (analog[0].mq != -1 || analog[1].mq != -1)
		devc->num_samples++;
}

static int brymen_bm86x_send_command(const struct sr_dev_inst *sdi)
{
	struct sr_usb_dev_inst *usb;
	unsigned char buf[] = { 0x00, 0x86, 0x66 };
	int ret;

	usb = sdi->conn;

	sr_dbg("Sending HID set report.");
	ret = libusb_control_transfer(usb->devhdl,
	                              LIBUSB_REQUEST_TYPE_CLASS  |
	                              LIBUSB_RECIPIENT_INTERFACE |
	                              LIBUSB_ENDPOINT_OUT,
	                              9,     /* bRequest: HID set_report */
	                              0x300, /* wValue: HID feature, report num 0 */
	                              0,     /* wIndex: interface 0 */
	                              buf, sizeof(buf), USB_TIMEOUT);

	if (ret < 0) {
		sr_err("HID feature report error: %s.", libusb_error_name(ret));
		return SR_ERR;
	}

	if (ret != sizeof(buf)) {
		sr_err("Short packet: sent %d/%zu bytes.", ret, sizeof(buf));
		return SR_ERR;
	}

	return SR_OK;
}

static int brymen_bm86x_read_interrupt(const struct sr_dev_inst *sdi)
{
	struct dev_context *devc;
	struct sr_usb_dev_inst *usb;
	unsigned char buf[24];
	int ret, transferred;

	devc = sdi->priv;
	usb = sdi->conn;

	sr_dbg("Reading HID interrupt report.");
	/* Get data from EP1 using an interrupt transfer. */
	ret = libusb_interrupt_transfer(usb->devhdl,
	                                LIBUSB_ENDPOINT_IN | 1, /* EP1, IN */
	                                buf, sizeof(buf),
	                                &transferred, USB_TIMEOUT);

	if (ret == LIBUSB_ERROR_TIMEOUT) {
		if (++devc->interrupt_pending > 3)
			devc->interrupt_pending = 0;
		return SR_OK;
	}

	if (ret < 0) {
		sr_err("USB receive error: %s.", libusb_error_name(ret));
		return SR_ERR;
	}

	if (transferred != sizeof(buf)) {
		sr_err("Short packet: received %d/%zu bytes.", transferred, sizeof(buf));
		return SR_ERR;
	}

	devc->interrupt_pending = 0;
	brymen_bm86x_handle_packet(sdi, buf);

	return SR_OK;
}

SR_PRIV int brymen_bm86x_receive_data(int fd, int revents, void *cb_data)
{
	struct sr_dev_inst *sdi;
	struct dev_context *devc;
	int64_t time;

	(void)fd;
	(void)revents;

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

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

	if (!devc->interrupt_pending) {
		if (brymen_bm86x_send_command(sdi))
			return FALSE;
		devc->interrupt_pending = 1;
	}

	if (brymen_bm86x_read_interrupt(sdi))
		return FALSE;

	if (devc->limit_samples && devc->num_samples >= devc->limit_samples) {
		sr_info("Requested number of samples reached, stopping.");
		sdi->driver->dev_acquisition_stop(sdi, cb_data);
		return TRUE;
	}

	if (devc->limit_msec) {
		time = (g_get_monotonic_time() - devc->start_time) / 1000;
		if (time > (int64_t)devc->limit_msec) {
			sr_info("Requested time limit reached, stopping.");
			sdi->driver->dev_acquisition_stop(sdi, cb_data);
			return TRUE;
		}
	}

	return TRUE;
}
Commit	Line	Data
8d9c8554 AJ	1	/*
	2	* This file is part of the libsigrok project.
	3	*
	4	* Copyright (C) 2014 Aurelien Jacobs <aurel@gnuage.org>
	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
6ec6c43b	20	#include <config.h>
ecaa89af AJ	21	#include <string.h>
ecaa89af AJ	22	#include <math.h>
8d9c8554 AJ	23	#include "protocol.h"
8d9c8554 AJ	24
ecaa89af AJ	25	#define USB_TIMEOUT 500
ecaa89af AJ	26
329733d9	27	static const char char_map[128] = {
ecaa89af AJ	28	[0x20] = '-',
	29	[0x5F] = '0',
	30	[0x50] = '1',
	31	[0x6D] = '2',
	32	[0x7C] = '3',
	33	[0x72] = '4',
	34	[0x3E] = '5',
	35	[0x3F] = '6',
	36	[0x54] = '7',
	37	[0x7F] = '8',
	38	[0x7E] = '9',
	39	[0x0F] = 'C',
	40	[0x27] = 'F',
	41	[0x0B] = 'L',
	42	[0x79] = 'd',
	43	[0x10] = 'i',
	44	[0x39] = 'o',
	45	};
	46
	47	static int brymen_bm86x_parse_digits(const unsigned char *buf, int length,
	48	char str, float floatval,
	49	char *temp_unit, int flag)
	50	{
	51	char c, *p = str;
	52	int i, ret;
	53
	54	if (buf[0] & flag)
	55	*p++ = '-';
	56	for (i = 0; i < length; i++) {
	57	if (i && i < 5 && buf[i+1] & 0x01)
	58	*p++ = '.';
	59	c = char_map[buf[i+1] >> 1];
	60	if (i == 5 && (c == 'C' \|\| c == 'F'))
	61	*temp_unit = c;
	62	else if (c)
	63	*p++ = c;
	64	}
	65	*p = 0;
	66
	67	if ((ret = sr_atof_ascii(str, floatval))) {
	68	sr_dbg("invalid float string: '%s'", str);
	69	return ret;
	70	}
	71
	72	return SR_OK;
	73	}
	74
	75	static void brymen_bm86x_parse(unsigned char buf, float floatval,
	76	struct sr_datafeed_analog *analog)
	77	{
	78	char str[16], temp_unit;
	79	int ret1, ret2, over_limit;
	80
	81	ret1 = brymen_bm86x_parse_digits(buf+2, 6, str, &floatval[0],
	82	&temp_unit, 0x80);
	83	over_limit = strstr(str, "0L") \|\| strstr(str, "0.L");
	84	ret2 = brymen_bm86x_parse_digits(buf+9, 4, str, &floatval[1],
	85	&temp_unit, 0x10);
	86
	87	/* main display */
	88	if (ret1 == SR_OK \|\| over_limit) {
	89	/* SI unit */
	90	if (buf[8] & 0x01) {
	91	analog[0].mq = SR_MQ_VOLTAGE;
92	analog[0].unit = SR_UNIT_VOLT;
93	if (!strcmp(str, "diod"))
94	analog[0].mqflags \|= SR_MQFLAG_DIODE;
95	} else if (buf[14] & 0x80) {
96	analog[0].mq = SR_MQ_CURRENT;
97	analog[0].unit = SR_UNIT_AMPERE;
98	} else if (buf[14] & 0x20) {
99	analog[0].mq = SR_MQ_CAPACITANCE;
100	analog[0].unit = SR_UNIT_FARAD;
101	} else if (buf[14] & 0x10) {
102	analog[0].mq = SR_MQ_CONDUCTANCE;
103	analog[0].unit = SR_UNIT_SIEMENS;
104	} else if (buf[15] & 0x01) {
105	analog[0].mq = SR_MQ_FREQUENCY;
106	analog[0].unit = SR_UNIT_HERTZ;
107	} else if (buf[10] & 0x01) {
108	analog[0].mq = SR_MQ_CONTINUITY;
109	analog[0].unit = SR_UNIT_OHM;
110	} else if (buf[15] & 0x10) {
111	analog[0].mq = SR_MQ_RESISTANCE;
112	analog[0].unit = SR_UNIT_OHM;
113	} else if (buf[15] & 0x02) {
114	analog[0].mq = SR_MQ_POWER;
115	analog[0].unit = SR_UNIT_DECIBEL_MW;
116	} else if (buf[15] & 0x80) {
117	analog[0].mq = SR_MQ_DUTY_CYCLE;
118	analog[0].unit = SR_UNIT_PERCENTAGE;
119	} else if (buf[ 2] & 0x0A) {
120	analog[0].mq = SR_MQ_TEMPERATURE;
121	if (temp_unit == 'F')
122	analog[0].unit = SR_UNIT_FAHRENHEIT;
123	else
124	analog[0].unit = SR_UNIT_CELSIUS;
125	}
126
127	/* when MIN MAX and AVG are displayed at the same time, remove them */
128	if ((buf[1] & 0xE0) == 0xE0)
129	buf[1] &= ~0xE0;
130
131	/* AC/DC/Auto flags */
132	if (buf[1] & 0x10) analog[0].mqflags \|= SR_MQFLAG_DC;
133	if (buf[2] & 0x01) analog[0].mqflags \|= SR_MQFLAG_AC;
134	if (buf[1] & 0x01) analog[0].mqflags \|= SR_MQFLAG_AUTORANGE;
135	if (buf[1] & 0x08) analog[0].mqflags \|= SR_MQFLAG_HOLD;
136	if (buf[1] & 0x20) analog[0].mqflags \|= SR_MQFLAG_MAX;
137	if (buf[1] & 0x40) analog[0].mqflags \|= SR_MQFLAG_MIN;
138	if (buf[1] & 0x80) analog[0].mqflags \|= SR_MQFLAG_AVG;
139	if (buf[3] & 0x01) analog[0].mqflags \|= SR_MQFLAG_RELATIVE;
140
141	/* when dBm is displayed, remove the m suffix so that it is
142	not considered as the 10e-3 SI prefix */
143	if (buf[15] & 0x02)
144	buf[15] &= ~0x04;
145
146	/* SI prefix */
147	if (buf[14] & 0x40) floatval[0] = 1e-9; / n */
148	if (buf[15] & 0x08) floatval[0] = 1e-6; / µ */
149	if (buf[15] & 0x04) floatval[0] = 1e-3; / m */
150	if (buf[15] & 0x40) floatval[0] = 1e3; / k */
151	if (buf[15] & 0x20) floatval[0] = 1e6; / M */
152
153	if (over_limit) floatval[0] = INFINITY;
154	}
155
156	/* secondary display */
157	if (ret2 == SR_OK) {
158	/* SI unit */
159	if (buf[14] & 0x08) {
160	analog[1].mq = SR_MQ_VOLTAGE;
161	analog[1].unit = SR_UNIT_VOLT;
162	} else if (buf[9] & 0x04) {
163	analog[1].mq = SR_MQ_CURRENT;
164	analog[1].unit = SR_UNIT_AMPERE;
af1e487e AJ	165	} else if (buf[9] & 0x08) {
	166	analog[1].mq = SR_MQ_CURRENT;
	167	analog[1].unit = SR_UNIT_PERCENTAGE;
ecaa89af AJ	168	} else if (buf[14] & 0x04) {
	169	analog[1].mq = SR_MQ_FREQUENCY;
	170	analog[1].unit = SR_UNIT_HERTZ;
	171	} else if (buf[9] & 0x40) {
	172	analog[1].mq = SR_MQ_TEMPERATURE;
	173	if (temp_unit == 'F')
	174	analog[1].unit = SR_UNIT_FAHRENHEIT;
	175	else
	176	analog[1].unit = SR_UNIT_CELSIUS;
	177	}
	178
	179	/* AC flag */
	180	if (buf[9] & 0x20) analog[1].mqflags \|= SR_MQFLAG_AC;
	181
	182	/* SI prefix */
	183	if (buf[ 9] & 0x01) floatval[1] = 1e-6; / µ */
	184	if (buf[ 9] & 0x02) floatval[1] = 1e-3; / m */
	185	if (buf[14] & 0x02) floatval[1] = 1e3; / k */
	186	if (buf[14] & 0x01) floatval[1] = 1e6; / M */
	187	}
	188
	189	if (buf[9] & 0x80)
	190	sr_spew("Battery is low.");
	191	}
	192
	193	static void brymen_bm86x_handle_packet(const struct sr_dev_inst *sdi,
	194	unsigned char *buf)
	195	{
	196	struct dev_context *devc;
	197	struct sr_datafeed_packet packet;
	198	struct sr_datafeed_analog analog[2];
	199	float floatval[2];
	200
	201	devc = sdi->priv;
	202
	203	analog[0].mq = -1;
	204	analog[0].mqflags = 0;
	205
	206	analog[1].mq = -1;
	207	analog[1].mqflags = 0;
	208
	209	brymen_bm86x_parse(buf, floatval, analog);
	210
	211	if (analog[0].mq != -1) {
	212	/* Got a measurement. */
	213	analog[0].num_samples = 1;
	214	analog[0].data = &floatval[0];
ba7dd8bb	215	analog[0].channels = g_slist_append(NULL, sdi->channels->data);
ecaa89af AJ	216	packet.type = SR_DF_ANALOG;
ecaa89af AJ	217	packet.payload = &analog[0];
102f1239	218	sr_session_send(sdi, &packet);
ba7dd8bb	219	g_slist_free(analog[0].channels);
ecaa89af AJ	220	}
	221
	222	if (analog[1].mq != -1) {
	223	/* Got a measurement. */
	224	analog[1].num_samples = 1;
	225	analog[1].data = &floatval[1];
ba7dd8bb	226	analog[1].channels = g_slist_append(NULL, sdi->channels->next->data);
ecaa89af AJ	227	packet.type = SR_DF_ANALOG;
ecaa89af AJ	228	packet.payload = &analog[1];
102f1239	229	sr_session_send(sdi, &packet);
ba7dd8bb	230	g_slist_free(analog[1].channels);
ecaa89af AJ	231	}
	232
	233	if (analog[0].mq != -1 \|\| analog[1].mq != -1)
	234	devc->num_samples++;
	235	}
	236
	237	static int brymen_bm86x_send_command(const struct sr_dev_inst *sdi)
	238	{
	239	struct sr_usb_dev_inst *usb;
	240	unsigned char buf[] = { 0x00, 0x86, 0x66 };
	241	int ret;
	242
	243	usb = sdi->conn;
	244
	245	sr_dbg("Sending HID set report.");
	246	ret = libusb_control_transfer(usb->devhdl,
	247	LIBUSB_REQUEST_TYPE_CLASS \|
	248	LIBUSB_RECIPIENT_INTERFACE \|
	249	LIBUSB_ENDPOINT_OUT,
	250	9, /* bRequest: HID set_report */
	251	0x300, /* wValue: HID feature, report num 0 */
	252	0, /* wIndex: interface 0 */
	253	buf, sizeof(buf), USB_TIMEOUT);
	254
	255	if (ret < 0) {
	256	sr_err("HID feature report error: %s.", libusb_error_name(ret));
	257	return SR_ERR;
	258	}
	259
	260	if (ret != sizeof(buf)) {
0c536bcd	261	sr_err("Short packet: sent %d/%zu bytes.", ret, sizeof(buf));
ecaa89af AJ	262	return SR_ERR;
	263	}
	264
	265	return SR_OK;
	266	}
	267
	268	static int brymen_bm86x_read_interrupt(const struct sr_dev_inst *sdi)
	269	{
	270	struct dev_context *devc;
	271	struct sr_usb_dev_inst *usb;
	272	unsigned char buf[24];
	273	int ret, transferred;
	274
	275	devc = sdi->priv;
	276	usb = sdi->conn;
	277
	278	sr_dbg("Reading HID interrupt report.");
	279	/* Get data from EP1 using an interrupt transfer. */
	280	ret = libusb_interrupt_transfer(usb->devhdl,
	281	LIBUSB_ENDPOINT_IN \| 1, /* EP1, IN */
	282	buf, sizeof(buf),
	283	&transferred, USB_TIMEOUT);
	284
	285	if (ret == LIBUSB_ERROR_TIMEOUT) {
	286	if (++devc->interrupt_pending > 3)
	287	devc->interrupt_pending = 0;
	288	return SR_OK;
	289	}
	290
	291	if (ret < 0) {
	292	sr_err("USB receive error: %s.", libusb_error_name(ret));
	293	return SR_ERR;
	294	}
	295
	296	if (transferred != sizeof(buf)) {
6433156c	297	sr_err("Short packet: received %d/%zu bytes.", transferred, sizeof(buf));
ecaa89af AJ	298	return SR_ERR;
	299	}
	300
	301	devc->interrupt_pending = 0;
	302	brymen_bm86x_handle_packet(sdi, buf);
	303
	304	return SR_OK;
	305	}
	306
8d9c8554 AJ	307	SR_PRIV int brymen_bm86x_receive_data(int fd, int revents, void *cb_data)
8d9c8554 AJ	308	{
ecaa89af	309	struct sr_dev_inst *sdi;
8d9c8554	310	struct dev_context *devc;
ecaa89af	311	int64_t time;
8d9c8554 AJ	312
8d9c8554 AJ	313	(void)fd;
ecaa89af	314	(void)revents;
8d9c8554 AJ	315
	316	if (!(sdi = cb_data))
	317	return TRUE;
	318
	319	if (!(devc = sdi->priv))
	320	return TRUE;
	321
ecaa89af AJ	322	if (!devc->interrupt_pending) {
	323	if (brymen_bm86x_send_command(sdi))
	324	return FALSE;
	325	devc->interrupt_pending = 1;
	326	}
	327
	328	if (brymen_bm86x_read_interrupt(sdi))
	329	return FALSE;
	330
	331	if (devc->limit_samples && devc->num_samples >= devc->limit_samples) {
	332	sr_info("Requested number of samples reached, stopping.");
	333	sdi->driver->dev_acquisition_stop(sdi, cb_data);
	334	return TRUE;
	335	}
	336
	337	if (devc->limit_msec) {
	338	time = (g_get_monotonic_time() - devc->start_time) / 1000;
	339	if (time > (int64_t)devc->limit_msec) {
	340	sr_info("Requested time limit reached, stopping.");
	341	sdi->driver->dev_acquisition_stop(sdi, cb_data);
	342	return TRUE;
	343	}
8d9c8554 AJ	344	}
	345
	346	return TRUE;
	347	}