[libsigrok.git] / src / hardware / fx2lafw / protocol.c

/*
 * This file is part of the libsigrok project.
 *
 * Copyright (C) 2013 Bert Vermeulen <bert@biot.com>
 * Copyright (C) 2012 Joel Holdsworth <joel@airwebreathe.org.uk>
 *
 * 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 <glib.h>
#include <glib/gstdio.h>
#include "protocol.h"
#include "dslogic.h"

#pragma pack(push, 1)

struct version_info {
	uint8_t major;
	uint8_t minor;
};

struct cmd_start_acquisition {
	uint8_t flags;
	uint8_t sample_delay_h;
	uint8_t sample_delay_l;
};

#pragma pack(pop)

#define USB_TIMEOUT 100

static int command_get_fw_version(libusb_device_handle *devhdl,
				  struct version_info *vi)
{
	int ret;

	ret = libusb_control_transfer(devhdl, LIBUSB_REQUEST_TYPE_VENDOR |
		LIBUSB_ENDPOINT_IN, CMD_GET_FW_VERSION, 0x0000, 0x0000,
		(unsigned char *)vi, sizeof(struct version_info), USB_TIMEOUT);

	if (ret < 0) {
		sr_err("Unable to get version info: %s.",
		       libusb_error_name(ret));
		return SR_ERR;
	}

	return SR_OK;
}

static int command_get_revid_version(struct sr_dev_inst *sdi, uint8_t *revid)
{
	struct dev_context *devc = sdi->priv;
	struct sr_usb_dev_inst *usb = sdi->conn;
	libusb_device_handle *devhdl = usb->devhdl;
	int cmd, ret;

	cmd = devc->dslogic ? DS_CMD_GET_REVID_VERSION : CMD_GET_REVID_VERSION;
	ret = libusb_control_transfer(devhdl, LIBUSB_REQUEST_TYPE_VENDOR |
		LIBUSB_ENDPOINT_IN, cmd, 0x0000, 0x0000, revid, 1, USB_TIMEOUT);

	if (ret < 0) {
		sr_err("Unable to get REVID: %s.", libusb_error_name(ret));
		return SR_ERR;
	}

	return SR_OK;
}

SR_PRIV int fx2lafw_command_start_acquisition(const struct sr_dev_inst *sdi)
{
	struct dev_context *devc;
	struct sr_usb_dev_inst *usb;
	uint64_t samplerate;
	struct cmd_start_acquisition cmd;
	int delay, ret;

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

	/* Compute the sample rate. */
	if (devc->sample_wide && samplerate > MAX_16BIT_SAMPLE_RATE) {
		sr_err("Unable to sample at %" PRIu64 "Hz "
		       "when collecting 16-bit samples.", samplerate);
		return SR_ERR;
	}

	delay = 0;
	cmd.flags = cmd.sample_delay_h = cmd.sample_delay_l = 0;
	if ((SR_MHZ(48) % samplerate) == 0) {
		cmd.flags = CMD_START_FLAGS_CLK_48MHZ;
		delay = SR_MHZ(48) / samplerate - 1;
		if (delay > MAX_SAMPLE_DELAY)
			delay = 0;
	}

	if (delay == 0 && (SR_MHZ(30) % samplerate) == 0) {
		cmd.flags = CMD_START_FLAGS_CLK_30MHZ;
		delay = SR_MHZ(30) / samplerate - 1;
	}

	sr_dbg("GPIF delay = %d, clocksource = %sMHz.", delay,
		(cmd.flags & CMD_START_FLAGS_CLK_48MHZ) ? "48" : "30");

	if (delay <= 0 || delay > MAX_SAMPLE_DELAY) {
		sr_err("Unable to sample at %" PRIu64 "Hz.", samplerate);
		return SR_ERR;
	}

	cmd.sample_delay_h = (delay >> 8) & 0xff;
	cmd.sample_delay_l = delay & 0xff;

	/* Select the sampling width. */
	cmd.flags |= devc->sample_wide ? CMD_START_FLAGS_SAMPLE_16BIT :
		CMD_START_FLAGS_SAMPLE_8BIT;

	/* Send the control message. */
	ret = libusb_control_transfer(usb->devhdl, LIBUSB_REQUEST_TYPE_VENDOR |
			LIBUSB_ENDPOINT_OUT, CMD_START, 0x0000, 0x0000,
			(unsigned char *)&cmd, sizeof(cmd), USB_TIMEOUT);
	if (ret < 0) {
		sr_err("Unable to send start command: %s.",
		       libusb_error_name(ret));
		return SR_ERR;
	}

	return SR_OK;
}

/**
 * Check the USB configuration to determine if this is an fx2lafw device.
 *
 * @return TRUE if the device's configuration profile matches fx2lafw
 *         configuration, FALSE otherwise.
 */
SR_PRIV gboolean match_manuf_prod(libusb_device *dev, const char *manufacturer,
		const char *product)
{
	struct libusb_device_descriptor des;
	struct libusb_device_handle *hdl;
	gboolean ret;
	unsigned char strdesc[64];

	hdl = NULL;
	ret = FALSE;
	while (!ret) {
		/* Assume the FW has not been loaded, unless proven wrong. */
		if (libusb_get_device_descriptor(dev, &des) != 0)
			break;

		if (libusb_open(dev, &hdl) != 0)
			break;

		if (libusb_get_string_descriptor_ascii(hdl,
				des.iManufacturer, strdesc, sizeof(strdesc)) < 0)
			break;
		if (strcmp((const char *)strdesc, manufacturer))
			break;

		if (libusb_get_string_descriptor_ascii(hdl,
				des.iProduct, strdesc, sizeof(strdesc)) < 0)
			break;
		if (strcmp((const char *)strdesc, product))
			break;

		ret = TRUE;
	}
	if (hdl)
		libusb_close(hdl);

	return ret;
}

SR_PRIV int fx2lafw_dev_open(struct sr_dev_inst *sdi, struct sr_dev_driver *di)
{
	libusb_device **devlist;
	struct sr_usb_dev_inst *usb;
	struct libusb_device_descriptor des;
	struct dev_context *devc;
	struct drv_context *drvc;
	struct version_info vi;
	int ret, i, device_count;
	uint8_t revid;
	char connection_id[64];

	drvc = di->context;
	devc = sdi->priv;
	usb = sdi->conn;

	if (sdi->status == SR_ST_ACTIVE)
		/* Device is already in use. */
		return SR_ERR;

	device_count = libusb_get_device_list(drvc->sr_ctx->libusb_ctx, &devlist);
	if (device_count < 0) {
		sr_err("Failed to get device list: %s.",
		       libusb_error_name(device_count));
		return SR_ERR;
	}

	for (i = 0; i < device_count; i++) {
		if ((ret = libusb_get_device_descriptor(devlist[i], &des))) {
			sr_err("Failed to get device descriptor: %s.",
			       libusb_error_name(ret));
			continue;
		}

		if (des.idVendor != devc->profile->vid
		    || des.idProduct != devc->profile->pid)
			continue;

		if ((sdi->status == SR_ST_INITIALIZING) ||
				(sdi->status == SR_ST_INACTIVE)) {
			/*
			 * Check device by its physical USB bus/port address.
			 */
			usb_get_port_path(devlist[i], connection_id, sizeof(connection_id));
			if (strcmp(sdi->connection_id, connection_id))
				/* This is not the one. */
				continue;
		}

		if (!(ret = libusb_open(devlist[i], &usb->devhdl))) {
			if (usb->address == 0xff)
				/*
				 * First time we touch this device after FW
				 * upload, so we don't know the address yet.
				 */
				usb->address = libusb_get_device_address(devlist[i]);
		} else {
			sr_err("Failed to open device: %s.",
			       libusb_error_name(ret));
			break;
		}

		if (libusb_has_capability(LIBUSB_CAP_SUPPORTS_DETACH_KERNEL_DRIVER)) {
			if (libusb_kernel_driver_active(usb->devhdl, USB_INTERFACE) == 1) {
				if ((ret = libusb_detach_kernel_driver(usb->devhdl, USB_INTERFACE)) < 0) {
					sr_err("Failed to detach kernel driver: %s.",
						libusb_error_name(ret));
					return SR_ERR;
				}
			}
		}

		ret = command_get_fw_version(usb->devhdl, &vi);
		if (ret != SR_OK) {
			sr_err("Failed to get firmware version.");
			break;
		}

		ret = command_get_revid_version(sdi, &revid);
		if (ret != SR_OK) {
			sr_err("Failed to get REVID.");
			break;
		}

		/*
		 * Changes in major version mean incompatible/API changes, so
		 * bail out if we encounter an incompatible version.
		 * Different minor versions are OK, they should be compatible.
		 */
		if (vi.major != FX2LAFW_REQUIRED_VERSION_MAJOR) {
			sr_err("Expected firmware version %d.x, "
			       "got %d.%d.", FX2LAFW_REQUIRED_VERSION_MAJOR,
			       vi.major, vi.minor);
			break;
		}

		sdi->status = SR_ST_ACTIVE;
		sr_info("Opened device on %d.%d (logical) / %s (physical), "
			"interface %d, firmware %d.%d.",
			usb->bus, usb->address, connection_id,
			USB_INTERFACE, vi.major, vi.minor);

		sr_info("Detected REVID=%d, it's a Cypress CY7C68013%s.",
			revid, (revid != 1) ? " (FX2)" : "A (FX2LP)");

		break;
	}
	libusb_free_device_list(devlist, 1);

	if (sdi->status != SR_ST_ACTIVE)
		return SR_ERR;

	return SR_OK;
}

SR_PRIV struct dev_context *fx2lafw_dev_new(void)
{
	struct dev_context *devc;

	devc = g_malloc0(sizeof(struct dev_context));
	devc->profile = NULL;
	devc->fw_updated = 0;
	devc->cur_samplerate = 0;
	devc->limit_samples = 0;
	devc->capture_ratio = 0;
	devc->sample_wide = FALSE;
	devc->stl = NULL;

	return devc;
}

SR_PRIV void fx2lafw_abort_acquisition(struct dev_context *devc)
{
	int i;

	devc->acq_aborted = TRUE;

	for (i = devc->num_transfers - 1; i >= 0; i--) {
		if (devc->transfers[i])
			libusb_cancel_transfer(devc->transfers[i]);
	}
}

static void finish_acquisition(struct sr_dev_inst *sdi)
{
	struct sr_datafeed_packet packet;
	struct dev_context *devc;

	devc = sdi->priv;

	/* Terminate session. */
	packet.type = SR_DF_END;
	sr_session_send(sdi, &packet);

	/* Remove fds from polling. */
	usb_source_remove(sdi->session, devc->ctx);

	devc->num_transfers = 0;
	g_free(devc->transfers);

	if (devc->stl) {
		soft_trigger_logic_free(devc->stl);
		devc->stl = NULL;
	}
}

static void free_transfer(struct libusb_transfer *transfer)
{
	struct sr_dev_inst *sdi;
	struct dev_context *devc;
	unsigned int i;

	sdi = transfer->user_data;
	devc = sdi->priv;

	g_free(transfer->buffer);
	transfer->buffer = NULL;
	libusb_free_transfer(transfer);

	for (i = 0; i < devc->num_transfers; i++) {
		if (devc->transfers[i] == transfer) {
			devc->transfers[i] = NULL;
			break;
		}
	}

	devc->submitted_transfers--;
	if (devc->submitted_transfers == 0)
		finish_acquisition(sdi);
}

static void resubmit_transfer(struct libusb_transfer *transfer)
{
	int ret;

	if ((ret = libusb_submit_transfer(transfer)) == LIBUSB_SUCCESS)
		return;

	sr_err("%s: %s", __func__, libusb_error_name(ret));
	free_transfer(transfer);

}

SR_PRIV void LIBUSB_CALL fx2lafw_receive_transfer(struct libusb_transfer *transfer)
{
	struct sr_dev_inst *sdi;
	struct dev_context *devc;
	gboolean packet_has_error = FALSE;
	struct sr_datafeed_packet packet;
	struct sr_datafeed_logic logic;
	unsigned int num_samples;
	int trigger_offset, cur_sample_count, unitsize;
	int pre_trigger_samples;

	sdi = transfer->user_data;
	devc = sdi->priv;

	/*
	 * If acquisition has already ended, just free any queued up
	 * transfer that come in.
	 */
	if (devc->acq_aborted) {
		free_transfer(transfer);
		return;
	}

	sr_dbg("receive_transfer(): status %s received %d bytes.",
		libusb_error_name(transfer->status), transfer->actual_length);

	/* Save incoming transfer before reusing the transfer struct. */
	unitsize = devc->sample_wide ? 2 : 1;
	cur_sample_count = transfer->actual_length / unitsize;

	switch (transfer->status) {
	case LIBUSB_TRANSFER_NO_DEVICE:
		fx2lafw_abort_acquisition(devc);
		free_transfer(transfer);
		return;
	case LIBUSB_TRANSFER_COMPLETED:
	case LIBUSB_TRANSFER_TIMED_OUT: /* We may have received some data though. */
		break;
	default:
		packet_has_error = TRUE;
		break;
	}

	if (transfer->actual_length == 0 || packet_has_error) {
		devc->empty_transfer_count++;
		if (devc->empty_transfer_count > MAX_EMPTY_TRANSFERS) {
			/*
			 * The FX2 gave up. End the acquisition, the frontend
			 * will work out that the samplecount is short.
			 */
			fx2lafw_abort_acquisition(devc);
			free_transfer(transfer);
		} else {
			resubmit_transfer(transfer);
		}
		return;
	} else {
		devc->empty_transfer_count = 0;
	}

	if (devc->trigger_fired) {
		if (!devc->limit_samples || devc->sent_samples < devc->limit_samples) {
			/* Send the incoming transfer to the session bus. */
			packet.type = SR_DF_LOGIC;
			packet.payload = &logic;
			if (devc->limit_samples && devc->sent_samples + cur_sample_count > devc->limit_samples)
				num_samples = devc->limit_samples - devc->sent_samples;
			else
				num_samples = cur_sample_count;
			logic.length = num_samples * unitsize;
			logic.unitsize = unitsize;
			logic.data = transfer->buffer;
			sr_session_send(devc->cb_data, &packet);
			devc->sent_samples += num_samples;
		}
	} else {
		trigger_offset = soft_trigger_logic_check(devc->stl,
			transfer->buffer, transfer->actual_length, &pre_trigger_samples);
		if (trigger_offset > -1) {
			devc->sent_samples += pre_trigger_samples;
			packet.type = SR_DF_LOGIC;
			packet.payload = &logic;
			num_samples = cur_sample_count - trigger_offset;
			if (devc->limit_samples &&
					num_samples > devc->limit_samples - devc->sent_samples)
				num_samples = devc->limit_samples - devc->sent_samples;
			logic.length = num_samples * unitsize;
			logic.unitsize = unitsize;
			logic.data = transfer->buffer + trigger_offset * unitsize;
			sr_session_send(devc->cb_data, &packet);
			devc->sent_samples += num_samples;

			devc->trigger_fired = TRUE;
		}
	}

	if (devc->limit_samples && devc->sent_samples >= devc->limit_samples) {
		fx2lafw_abort_acquisition(devc);
		free_transfer(transfer);
	} else
		resubmit_transfer(transfer);
}

static unsigned int to_bytes_per_ms(unsigned int samplerate)
{
	return samplerate / 1000;
}

SR_PRIV size_t fx2lafw_get_buffer_size(struct dev_context *devc)
{
	size_t s;

	/*
	 * The buffer should be large enough to hold 10ms of data and
	 * a multiple of 512.
	 */
	s = 10 * to_bytes_per_ms(devc->cur_samplerate);
	return (s + 511) & ~511;
}

SR_PRIV unsigned int fx2lafw_get_number_of_transfers(struct dev_context *devc)
{
	unsigned int n;

	/* Total buffer size should be able to hold about 500ms of data. */
	n = (500 * to_bytes_per_ms(devc->cur_samplerate) /
		fx2lafw_get_buffer_size(devc));

	if (n > NUM_SIMUL_TRANSFERS)
		return NUM_SIMUL_TRANSFERS;

	return n;
}

SR_PRIV unsigned int fx2lafw_get_timeout(struct dev_context *devc)
{
	size_t total_size;
	unsigned int timeout;

	total_size = fx2lafw_get_buffer_size(devc) *
			fx2lafw_get_number_of_transfers(devc);
	timeout = total_size / to_bytes_per_ms(devc->cur_samplerate);
	return timeout + timeout / 4; /* Leave a headroom of 25% percent. */
}
Commit	Line	Data
2f937611 UH	1	/*
	2	* This file is part of the libsigrok project.
	3	*
	4	* Copyright (C) 2013 Bert Vermeulen <bert@biot.com>
	5	* Copyright (C) 2012 Joel Holdsworth <joel@airwebreathe.org.uk>
	6	*
	7	* This program is free software: you can redistribute it and/or modify
	8	* it under the terms of the GNU General Public License as published by
	9	* the Free Software Foundation, either version 3 of the License, or
	10	* (at your option) any later version.
	11	*
	12	* This program is distributed in the hope that it will be useful,
	13	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	15	* GNU General Public License for more details.
	16	*
	17	* You should have received a copy of the GNU General Public License
	18	* along with this program. If not, see <http://www.gnu.org/licenses/>.
	19	*/
	20
6ec6c43b	21	#include <config.h>
a7d7f93c BV	22	#include <glib.h>
a7d7f93c BV	23	#include <glib/gstdio.h>
2f937611	24	#include "protocol.h"
b9d53092	25	#include "dslogic.h"
2f937611	26
2f937611 UH	27	#pragma pack(push, 1)
	28
	29	struct version_info {
	30	uint8_t major;
	31	uint8_t minor;
	32	};
	33
	34	struct cmd_start_acquisition {
	35	uint8_t flags;
	36	uint8_t sample_delay_h;
	37	uint8_t sample_delay_l;
	38	};
	39
	40	#pragma pack(pop)
	41
4df5739a UH	42	#define USB_TIMEOUT 100
4df5739a UH	43
2f937611 UH	44	static int command_get_fw_version(libusb_device_handle *devhdl,
	45	struct version_info *vi)
	46	{
	47	int ret;
	48
	49	ret = libusb_control_transfer(devhdl, LIBUSB_REQUEST_TYPE_VENDOR \|
	50	LIBUSB_ENDPOINT_IN, CMD_GET_FW_VERSION, 0x0000, 0x0000,
4df5739a	51	(unsigned char *)vi, sizeof(struct version_info), USB_TIMEOUT);
2f937611 UH	52
	53	if (ret < 0) {
	54	sr_err("Unable to get version info: %s.",
	55	libusb_error_name(ret));
	56	return SR_ERR;
	57	}
	58
	59	return SR_OK;
	60	}
	61
a54edb1d	62	static int command_get_revid_version(struct sr_dev_inst sdi, uint8_t revid)
2f937611	63	{
a7d7f93c	64	struct dev_context *devc = sdi->priv;
a54edb1d ML	65	struct sr_usb_dev_inst *usb = sdi->conn;
a54edb1d ML	66	libusb_device_handle *devhdl = usb->devhdl;
a7d7f93c	67	int cmd, ret;
2f937611	68
b9d53092	69	cmd = devc->dslogic ? DS_CMD_GET_REVID_VERSION : CMD_GET_REVID_VERSION;
2f937611	70	ret = libusb_control_transfer(devhdl, LIBUSB_REQUEST_TYPE_VENDOR \|
4df5739a	71	LIBUSB_ENDPOINT_IN, cmd, 0x0000, 0x0000, revid, 1, USB_TIMEOUT);
2f937611 UH	72
	73	if (ret < 0) {
	74	sr_err("Unable to get REVID: %s.", libusb_error_name(ret));
	75	return SR_ERR;
	76	}
	77
	78	return SR_OK;
	79	}
	80
a54edb1d	81	SR_PRIV int fx2lafw_command_start_acquisition(const struct sr_dev_inst *sdi)
2f937611	82	{
81a34976 BV	83	struct dev_context *devc;
	84	struct sr_usb_dev_inst *usb;
	85	uint64_t samplerate;
	86	struct cmd_start_acquisition cmd;
	87	int delay, ret;
	88
	89	devc = sdi->priv;
	90	usb = sdi->conn;
	91	samplerate = devc->cur_samplerate;
2f937611 UH	92
2f937611 UH	93	/* Compute the sample rate. */
81a34976	94	if (devc->sample_wide && samplerate > MAX_16BIT_SAMPLE_RATE) {
2f937611 UH	95	sr_err("Unable to sample at %" PRIu64 "Hz "
	96	"when collecting 16-bit samples.", samplerate);
	97	return SR_ERR;
	98	}
	99
81a34976 BV	100	delay = 0;
81a34976 BV	101	cmd.flags = cmd.sample_delay_h = cmd.sample_delay_l = 0;
2f937611 UH	102	if ((SR_MHZ(48) % samplerate) == 0) {
	103	cmd.flags = CMD_START_FLAGS_CLK_48MHZ;
	104	delay = SR_MHZ(48) / samplerate - 1;
	105	if (delay > MAX_SAMPLE_DELAY)
	106	delay = 0;
	107	}
	108
	109	if (delay == 0 && (SR_MHZ(30) % samplerate) == 0) {
	110	cmd.flags = CMD_START_FLAGS_CLK_30MHZ;
	111	delay = SR_MHZ(30) / samplerate - 1;
	112	}
	113
b9d53092	114	sr_dbg("GPIF delay = %d, clocksource = %sMHz.", delay,
2f937611 UH	115	(cmd.flags & CMD_START_FLAGS_CLK_48MHZ) ? "48" : "30");
	116
	117	if (delay <= 0 \|\| delay > MAX_SAMPLE_DELAY) {
	118	sr_err("Unable to sample at %" PRIu64 "Hz.", samplerate);
	119	return SR_ERR;
	120	}
	121
	122	cmd.sample_delay_h = (delay >> 8) & 0xff;
	123	cmd.sample_delay_l = delay & 0xff;
	124
	125	/* Select the sampling width. */
81a34976	126	cmd.flags \|= devc->sample_wide ? CMD_START_FLAGS_SAMPLE_16BIT :
2f937611 UH	127	CMD_START_FLAGS_SAMPLE_8BIT;
	128
	129	/* Send the control message. */
81a34976	130	ret = libusb_control_transfer(usb->devhdl, LIBUSB_REQUEST_TYPE_VENDOR \|
2f937611	131	LIBUSB_ENDPOINT_OUT, CMD_START, 0x0000, 0x0000,
4df5739a	132	(unsigned char *)&cmd, sizeof(cmd), USB_TIMEOUT);
2f937611 UH	133	if (ret < 0) {
	134	sr_err("Unable to send start command: %s.",
	135	libusb_error_name(ret));
	136	return SR_ERR;
	137	}
	138
	139	return SR_OK;
	140	}
	141
	142	/**
	143	* Check the USB configuration to determine if this is an fx2lafw device.
	144	*
a7d7f93c	145	* @return TRUE if the device's configuration profile matches fx2lafw
6fcf3f0a	146	* configuration, FALSE otherwise.
2f937611	147	*/
a7d7f93c BV	148	SR_PRIV gboolean match_manuf_prod(libusb_device dev, const char manufacturer,
a7d7f93c BV	149	const char *product)
2f937611 UH	150	{
	151	struct libusb_device_descriptor des;
	152	struct libusb_device_handle *hdl;
	153	gboolean ret;
	154	unsigned char strdesc[64];
	155
	156	hdl = NULL;
	157	ret = FALSE;
	158	while (!ret) {
	159	/* Assume the FW has not been loaded, unless proven wrong. */
	160	if (libusb_get_device_descriptor(dev, &des) != 0)
	161	break;
	162
	163	if (libusb_open(dev, &hdl) != 0)
	164	break;
	165
	166	if (libusb_get_string_descriptor_ascii(hdl,
a7d7f93c	167	des.iManufacturer, strdesc, sizeof(strdesc)) < 0)
2f937611	168	break;
bc497772	169	if (strcmp((const char *)strdesc, manufacturer))
2f937611 UH	170	break;
	171
	172	if (libusb_get_string_descriptor_ascii(hdl,
	173	des.iProduct, strdesc, sizeof(strdesc)) < 0)
	174	break;
bc497772	175	if (strcmp((const char *)strdesc, product))
2f937611 UH	176	break;
2f937611 UH	177
2f937611 UH	178	ret = TRUE;
	179	}
	180	if (hdl)
	181	libusb_close(hdl);
	182
	183	return ret;
	184	}
	185
	186	SR_PRIV int fx2lafw_dev_open(struct sr_dev_inst sdi, struct sr_dev_driver di)
	187	{
	188	libusb_device **devlist;
	189	struct sr_usb_dev_inst *usb;
	190	struct libusb_device_descriptor des;
	191	struct dev_context *devc;
	192	struct drv_context *drvc;
	193	struct version_info vi;
5e2c86eb	194	int ret, i, device_count;
2f937611	195	uint8_t revid;
5e2c86eb	196	char connection_id[64];
2f937611	197
41812aca	198	drvc = di->context;
2f937611 UH	199	devc = sdi->priv;
	200	usb = sdi->conn;
	201
	202	if (sdi->status == SR_ST_ACTIVE)
	203	/* Device is already in use. */
	204	return SR_ERR;
	205
2f937611 UH	206	device_count = libusb_get_device_list(drvc->sr_ctx->libusb_ctx, &devlist);
	207	if (device_count < 0) {
	208	sr_err("Failed to get device list: %s.",
	209	libusb_error_name(device_count));
	210	return SR_ERR;
	211	}
	212
	213	for (i = 0; i < device_count; i++) {
	214	if ((ret = libusb_get_device_descriptor(devlist[i], &des))) {
	215	sr_err("Failed to get device descriptor: %s.",
	216	libusb_error_name(ret));
	217	continue;
	218	}
	219
	220	if (des.idVendor != devc->profile->vid
	221	\|\| des.idProduct != devc->profile->pid)
	222	continue;
	223
5e2c86eb SA	224	if ((sdi->status == SR_ST_INITIALIZING) \|\|
5e2c86eb SA	225	(sdi->status == SR_ST_INACTIVE)) {
2f937611	226	/*
5e2c86eb	227	* Check device by its physical USB bus/port address.
2f937611	228	*/
5e2c86eb SA	229	usb_get_port_path(devlist[i], connection_id, sizeof(connection_id));
5e2c86eb SA	230	if (strcmp(sdi->connection_id, connection_id))
2f937611 UH	231	/* This is not the one. */
	232	continue;
	233	}
	234
	235	if (!(ret = libusb_open(devlist[i], &usb->devhdl))) {
	236	if (usb->address == 0xff)
	237	/*
	238	* First time we touch this device after FW
	239	* upload, so we don't know the address yet.
	240	*/
	241	usb->address = libusb_get_device_address(devlist[i]);
	242	} else {
	243	sr_err("Failed to open device: %s.",
	244	libusb_error_name(ret));
	245	break;
	246	}
	247
dc2903bb	248	if (libusb_has_capability(LIBUSB_CAP_SUPPORTS_DETACH_KERNEL_DRIVER)) {
c11a1e61 UH	249	if (libusb_kernel_driver_active(usb->devhdl, USB_INTERFACE) == 1) {
c11a1e61 UH	250	if ((ret = libusb_detach_kernel_driver(usb->devhdl, USB_INTERFACE)) < 0) {
dc2903bb UH	251	sr_err("Failed to detach kernel driver: %s.",
	252	libusb_error_name(ret));
	253	return SR_ERR;
	254	}
	255	}
	256	}
	257
2f937611 UH	258	ret = command_get_fw_version(usb->devhdl, &vi);
	259	if (ret != SR_OK) {
	260	sr_err("Failed to get firmware version.");
	261	break;
	262	}
	263
a54edb1d	264	ret = command_get_revid_version(sdi, &revid);
2f937611 UH	265	if (ret != SR_OK) {
	266	sr_err("Failed to get REVID.");
	267	break;
	268	}
	269
	270	/*
	271	* Changes in major version mean incompatible/API changes, so
	272	* bail out if we encounter an incompatible version.
	273	* Different minor versions are OK, they should be compatible.
	274	*/
	275	if (vi.major != FX2LAFW_REQUIRED_VERSION_MAJOR) {
	276	sr_err("Expected firmware version %d.x, "
	277	"got %d.%d.", FX2LAFW_REQUIRED_VERSION_MAJOR,
	278	vi.major, vi.minor);
	279	break;
	280	}
	281
	282	sdi->status = SR_ST_ACTIVE;
5e2c86eb	283	sr_info("Opened device on %d.%d (logical) / %s (physical), "
2f937611	284	"interface %d, firmware %d.%d.",
5e2c86eb	285	usb->bus, usb->address, connection_id,
2f937611 UH	286	USB_INTERFACE, vi.major, vi.minor);
	287
	288	sr_info("Detected REVID=%d, it's a Cypress CY7C68013%s.",
	289	revid, (revid != 1) ? " (FX2)" : "A (FX2LP)");
	290
	291	break;
	292	}
	293	libusb_free_device_list(devlist, 1);
	294
	295	if (sdi->status != SR_ST_ACTIVE)
	296	return SR_ERR;
	297
	298	return SR_OK;
	299	}
	300
2f937611 UH	301	SR_PRIV struct dev_context *fx2lafw_dev_new(void)
	302	{
	303	struct dev_context *devc;
	304
f57d8ffe	305	devc = g_malloc0(sizeof(struct dev_context));
2f937611 UH	306	devc->profile = NULL;
	307	devc->fw_updated = 0;
	308	devc->cur_samplerate = 0;
	309	devc->limit_samples = 0;
7bfcb25c	310	devc->capture_ratio = 0;
87b545fb	311	devc->sample_wide = FALSE;
335122f0	312	devc->stl = NULL;
2f937611 UH	313
	314	return devc;
	315	}
	316
	317	SR_PRIV void fx2lafw_abort_acquisition(struct dev_context *devc)
	318	{
	319	int i;
	320
b0ccd64d	321	devc->acq_aborted = TRUE;
2f937611 UH	322
	323	for (i = devc->num_transfers - 1; i >= 0; i--) {
	324	if (devc->transfers[i])
	325	libusb_cancel_transfer(devc->transfers[i]);
	326	}
	327	}
	328
102f1239	329	static void finish_acquisition(struct sr_dev_inst *sdi)
2f937611 UH	330	{
2f937611 UH	331	struct sr_datafeed_packet packet;
102f1239 BV	332	struct dev_context *devc;
	333
	334	devc = sdi->priv;
2f937611 UH	335
	336	/* Terminate session. */
	337	packet.type = SR_DF_END;
102f1239	338	sr_session_send(sdi, &packet);
2f937611 UH	339
2f937611 UH	340	/* Remove fds from polling. */
102f1239	341	usb_source_remove(sdi->session, devc->ctx);
2f937611 UH	342
	343	devc->num_transfers = 0;
	344	g_free(devc->transfers);
335122f0 BV	345
	346	if (devc->stl) {
	347	soft_trigger_logic_free(devc->stl);
	348	devc->stl = NULL;
	349	}
2f937611 UH	350	}
	351
	352	static void free_transfer(struct libusb_transfer *transfer)
	353	{
9615eeb5	354	struct sr_dev_inst *sdi;
2f937611 UH	355	struct dev_context *devc;
	356	unsigned int i;
	357
9615eeb5 BV	358	sdi = transfer->user_data;
9615eeb5 BV	359	devc = sdi->priv;
2f937611 UH	360
	361	g_free(transfer->buffer);
	362	transfer->buffer = NULL;
	363	libusb_free_transfer(transfer);
	364
	365	for (i = 0; i < devc->num_transfers; i++) {
	366	if (devc->transfers[i] == transfer) {
	367	devc->transfers[i] = NULL;
	368	break;
	369	}
	370	}
	371
	372	devc->submitted_transfers--;
	373	if (devc->submitted_transfers == 0)
102f1239	374	finish_acquisition(sdi);
2f937611 UH	375	}
	376
	377	static void resubmit_transfer(struct libusb_transfer *transfer)
	378	{
	379	int ret;
	380
	381	if ((ret = libusb_submit_transfer(transfer)) == LIBUSB_SUCCESS)
	382	return;
	383
9615eeb5	384	sr_err("%s: %s", __func__, libusb_error_name(ret));
2f937611	385	free_transfer(transfer);
2f937611	386
9615eeb5 BV	387	}
9615eeb5 BV	388
55462b8b	389	SR_PRIV void LIBUSB_CALL fx2lafw_receive_transfer(struct libusb_transfer *transfer)
2f937611	390	{
9615eeb5 BV	391	struct sr_dev_inst *sdi;
9615eeb5 BV	392	struct dev_context *devc;
2f937611 UH	393	gboolean packet_has_error = FALSE;
	394	struct sr_datafeed_packet packet;
	395	struct sr_datafeed_logic logic;
9615eeb5 BV	396	unsigned int num_samples;
9615eeb5 BV	397	int trigger_offset, cur_sample_count, unitsize;
7bfcb25c	398	int pre_trigger_samples;
2f937611	399
9615eeb5 BV	400	sdi = transfer->user_data;
9615eeb5 BV	401	devc = sdi->priv;
2f937611 UH	402
	403	/*
	404	* If acquisition has already ended, just free any queued up
	405	* transfer that come in.
	406	*/
b0ccd64d	407	if (devc->acq_aborted) {
2f937611 UH	408	free_transfer(transfer);
	409	return;
	410	}
	411
0f262763 UH	412	sr_dbg("receive_transfer(): status %s received %d bytes.",
0f262763 UH	413	libusb_error_name(transfer->status), transfer->actual_length);
2f937611 UH	414
2f937611 UH	415	/* Save incoming transfer before reusing the transfer struct. */
9615eeb5 BV	416	unitsize = devc->sample_wide ? 2 : 1;
9615eeb5 BV	417	cur_sample_count = transfer->actual_length / unitsize;
2f937611 UH	418
	419	switch (transfer->status) {
	420	case LIBUSB_TRANSFER_NO_DEVICE:
	421	fx2lafw_abort_acquisition(devc);
	422	free_transfer(transfer);
	423	return;
	424	case LIBUSB_TRANSFER_COMPLETED:
	425	case LIBUSB_TRANSFER_TIMED_OUT: /* We may have received some data though. */
	426	break;
	427	default:
	428	packet_has_error = TRUE;
	429	break;
	430	}
	431
	432	if (transfer->actual_length == 0 \|\| packet_has_error) {
	433	devc->empty_transfer_count++;
	434	if (devc->empty_transfer_count > MAX_EMPTY_TRANSFERS) {
	435	/*
	436	* The FX2 gave up. End the acquisition, the frontend
	437	* will work out that the samplecount is short.
	438	*/
	439	fx2lafw_abort_acquisition(devc);
	440	free_transfer(transfer);
	441	} else {
	442	resubmit_transfer(transfer);
	443	}
	444	return;
	445	} else {
	446	devc->empty_transfer_count = 0;
	447	}
	448
9615eeb5	449	if (devc->trigger_fired) {
2f663c82	450	if (!devc->limit_samples \|\| devc->sent_samples < devc->limit_samples) {
9615eeb5 BV	451	/* Send the incoming transfer to the session bus. */
	452	packet.type = SR_DF_LOGIC;
	453	packet.payload = &logic;
2f663c82	454	if (devc->limit_samples && devc->sent_samples + cur_sample_count > devc->limit_samples)
9615eeb5 BV	455	num_samples = devc->limit_samples - devc->sent_samples;
	456	else
	457	num_samples = cur_sample_count;
	458	logic.length = num_samples * unitsize;
	459	logic.unitsize = unitsize;
	460	logic.data = transfer->buffer;
	461	sr_session_send(devc->cb_data, &packet);
649e9e16	462	devc->sent_samples += num_samples;
9615eeb5 BV	463	}
9615eeb5 BV	464	} else {
335122f0	465	trigger_offset = soft_trigger_logic_check(devc->stl,
7bfcb25c	466	transfer->buffer, transfer->actual_length, &pre_trigger_samples);
9615eeb5	467	if (trigger_offset > -1) {
7bfcb25c	468	devc->sent_samples += pre_trigger_samples;
9615eeb5 BV	469	packet.type = SR_DF_LOGIC;
	470	packet.payload = &logic;
	471	num_samples = cur_sample_count - trigger_offset;
	472	if (devc->limit_samples &&
	473	num_samples > devc->limit_samples - devc->sent_samples)
	474	num_samples = devc->limit_samples - devc->sent_samples;
	475	logic.length = num_samples * unitsize;
	476	logic.unitsize = unitsize;
	477	logic.data = transfer->buffer + trigger_offset * unitsize;
	478	sr_session_send(devc->cb_data, &packet);
	479	devc->sent_samples += num_samples;
	480
	481	devc->trigger_fired = TRUE;
2f937611	482	}
06b5d7f7 BV	483	}
	484
	485	if (devc->limit_samples && devc->sent_samples >= devc->limit_samples) {
	486	fx2lafw_abort_acquisition(devc);
	487	free_transfer(transfer);
9615eeb5 BV	488	} else
9615eeb5 BV	489	resubmit_transfer(transfer);
2f937611 UH	490	}
	491
	492	static unsigned int to_bytes_per_ms(unsigned int samplerate)
	493	{
	494	return samplerate / 1000;
	495	}
	496
	497	SR_PRIV size_t fx2lafw_get_buffer_size(struct dev_context *devc)
	498	{
	499	size_t s;
	500
	501	/*
	502	* The buffer should be large enough to hold 10ms of data and
	503	* a multiple of 512.
	504	*/
	505	s = 10 * to_bytes_per_ms(devc->cur_samplerate);
	506	return (s + 511) & ~511;
	507	}
	508
	509	SR_PRIV unsigned int fx2lafw_get_number_of_transfers(struct dev_context *devc)
	510	{
	511	unsigned int n;
	512
	513	/* Total buffer size should be able to hold about 500ms of data. */
	514	n = (500 * to_bytes_per_ms(devc->cur_samplerate) /
	515	fx2lafw_get_buffer_size(devc));
	516
	517	if (n > NUM_SIMUL_TRANSFERS)
	518	return NUM_SIMUL_TRANSFERS;
	519
	520	return n;
	521	}
	522
	523	SR_PRIV unsigned int fx2lafw_get_timeout(struct dev_context *devc)
	524	{
	525	size_t total_size;
	526	unsigned int timeout;
	527
	528	total_size = fx2lafw_get_buffer_size(devc) *
	529	fx2lafw_get_number_of_transfers(devc);
	530	timeout = total_size / to_bytes_per_ms(devc->cur_samplerate);
	531	return timeout + timeout / 4; /* Leave a headroom of 25% percent. */
	532	}