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