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libsigrok/hardware/common/scpi_usbtmc_libusb.c

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/*
* 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 <string.h>
#include "libsigrok.h"
#include "libsigrok-internal.h"
#define LOG_PREFIX "scpi_usbtmc"
#define MAX_TRANSFER_LENGTH 2048
#define TRANSFER_TIMEOUT 1000
struct scpi_usbtmc_libusb {
struct sr_context *ctx;
struct sr_usb_dev_inst *usb;
int detached_kernel_driver;
uint8_t interface;
uint8_t bulk_in_ep;
uint8_t bulk_out_ep;
uint8_t interrupt_ep;
uint8_t usbtmc_int_cap;
uint8_t usbtmc_dev_cap;
uint8_t usb488_dev_cap;
uint8_t bTag;
uint8_t bulkin_attributes;
uint8_t buffer[MAX_TRANSFER_LENGTH];
int response_length;
int response_bytes_read;
int remaining_length;
int rigol_ds1000;
};
/* Some USBTMC-specific enums, as defined in the USBTMC standard. */
#define SUBCLASS_USBTMC 0x03
#define USBTMC_USB488 0x01
enum {
/* USBTMC control requests */
INITIATE_ABORT_BULK_OUT = 1,
CHECK_ABORT_BULK_OUT_STATUS = 2,
INITIATE_ABORT_BULK_IN = 3,
CHECK_ABORT_BULK_IN_STATUS = 4,
INITIATE_CLEAR = 5,
CHECK_CLEAR_STATUS = 6,
GET_CAPABILITIES = 7,
INDICATOR_PULSE = 64,
/* USB488 control requests */
READ_STATUS_BYTE = 128,
REN_CONTROL = 160,
GO_TO_LOCAL = 161,
LOCAL_LOCKOUT = 162,
};
/* USBTMC capabilities */
#define USBTMC_INT_CAP_LISTEN_ONLY 0x01
#define USBTMC_INT_CAP_TALK_ONLY 0x02
#define USBTMC_INT_CAP_INDICATOR 0x04
#define USBTMC_DEV_CAP_TERMCHAR 0x01
#define USB488_DEV_CAP_DT1 0x01
#define USB488_DEV_CAP_RL1 0x02
#define USB488_DEV_CAP_SR1 0x04
#define USB488_DEV_CAP_SCPI 0x08
/* Bulk messages constants */
#define USBTMC_BULK_HEADER_SIZE 12
/* Bulk MsgID values */
#define DEV_DEP_MSG_OUT 1
#define REQUEST_DEV_DEP_MSG_IN 2
#define DEV_DEP_MSG_IN 2
/* bmTransferAttributes */
#define EOM 0x01
#define TERM_CHAR_ENABLED 0x02
static GSList *scpi_usbtmc_libusb_scan(struct drv_context *drvc)
{
struct libusb_device **devlist;
struct libusb_device_descriptor des;
struct libusb_config_descriptor *confdes;
const struct libusb_interface_descriptor *intfdes;
GSList *resources = NULL;
int confidx, intfidx, ret, i;
char *res;
ret = libusb_get_device_list(drvc->sr_ctx->libusb_ctx, &devlist);
if (ret < 0) {
sr_err("Failed to get device list: %s.",
libusb_error_name(ret));
return NULL;
}
for (i = 0; devlist[i]; i++) {
if ((ret = libusb_get_device_descriptor(devlist[i], &des)) < 0) {
sr_err("Failed to get device descriptor: %s.",
libusb_error_name(ret));
continue;
}
for (confidx = 0; confidx < des.bNumConfigurations; confidx++) {
if ((ret = libusb_get_config_descriptor(devlist[i], confidx, &confdes)) < 0) {
sr_dbg("Failed to get configuration descriptor: %s, "
"ignoring device.", libusb_error_name(ret));
break;
}
for (intfidx = 0; intfidx < confdes->bNumInterfaces; intfidx++) {
intfdes = confdes->interface[intfidx].altsetting;
if (intfdes->bInterfaceClass != LIBUSB_CLASS_APPLICATION ||
intfdes->bInterfaceSubClass != SUBCLASS_USBTMC ||
intfdes->bInterfaceProtocol != USBTMC_USB488)
continue;
sr_dbg("Found USBTMC device (VID:PID = %04x:%04x, "
"bus.address = %d.%d).", des.idVendor, des.idProduct,
libusb_get_bus_number(devlist[i]),
libusb_get_device_address(devlist[i]));
res = g_strdup_printf("usbtmc/%d.%d",
libusb_get_bus_number(devlist[i]),
libusb_get_device_address(devlist[i]));
resources = g_slist_append(resources, res);
}
libusb_free_config_descriptor(confdes);
}
}
libusb_free_device_list(devlist, 1);
sr_dbg("Found %d device(s).", g_slist_length(resources));
return resources;
}
static int scpi_usbtmc_libusb_dev_inst_new(void *priv, struct drv_context *drvc,
const char *resource, char **params, const char *serialcomm)
{
struct scpi_usbtmc_libusb *uscpi = priv;
GSList *devices;
(void)resource;
(void)serialcomm;
if (!params || !params[1]) {
sr_err("Invalid parameters.");
return SR_ERR;
}
uscpi->ctx = drvc->sr_ctx;
devices = sr_usb_find(uscpi->ctx->libusb_ctx, params[1]);
if (g_slist_length(devices) != 1) {
sr_err("Failed to find USB device '%s'.", params[1]);
g_slist_free_full(devices, (GDestroyNotify)sr_usb_dev_inst_free);
return SR_ERR;
}
uscpi->usb = devices->data;
g_slist_free(devices);
return SR_OK;
}
static int scpi_usbtmc_libusb_open(void *priv)
{
struct scpi_usbtmc_libusb *uscpi = priv;
struct sr_usb_dev_inst *usb = uscpi->usb;
struct libusb_device *dev;
struct libusb_device_descriptor des;
struct libusb_config_descriptor *confdes;
const struct libusb_interface_descriptor *intfdes;
const struct libusb_endpoint_descriptor *ep;
int confidx, intfidx, epidx, config = 0;
uint8_t capabilities[24];
int ret, found = 0;
if (usb->devhdl)
return SR_OK;
if (sr_usb_open(uscpi->ctx->libusb_ctx, usb) != SR_OK)
return SR_ERR;
dev = libusb_get_device(usb->devhdl);
if ((ret = libusb_get_device_descriptor(dev, &des)) < 0) {
sr_err("Failed to get device descriptor: %s.",
libusb_error_name(ret));
return SR_ERR;
}
for (confidx = 0; confidx < des.bNumConfigurations; confidx++) {
if ((ret = libusb_get_config_descriptor(dev, confidx, &confdes)) < 0) {
sr_dbg("Failed to get configuration descriptor: %s, "
"ignoring device.", libusb_error_name(ret));
continue;
}
for (intfidx = 0; intfidx < confdes->bNumInterfaces; intfidx++) {
intfdes = confdes->interface[intfidx].altsetting;
if (intfdes->bInterfaceClass != LIBUSB_CLASS_APPLICATION ||
intfdes->bInterfaceSubClass != SUBCLASS_USBTMC ||
intfdes->bInterfaceProtocol != USBTMC_USB488)
continue;
uscpi->interface = intfdes->bInterfaceNumber;
sr_dbg("Interface %d", uscpi->interface);
config = confdes->bConfigurationValue;
sr_dbg("Configuration %d", config);
for (epidx = 0; epidx < intfdes->bNumEndpoints; epidx++) {
ep = &intfdes->endpoint[epidx];
if (ep->bmAttributes == LIBUSB_TRANSFER_TYPE_BULK &&
!(ep->bEndpointAddress & (LIBUSB_ENDPOINT_DIR_MASK))) {
uscpi->bulk_out_ep = ep->bEndpointAddress;
sr_dbg("Bulk OUT EP %d", uscpi->bulk_out_ep);
}
if (ep->bmAttributes == LIBUSB_TRANSFER_TYPE_BULK &&
ep->bEndpointAddress & (LIBUSB_ENDPOINT_DIR_MASK)) {
uscpi->bulk_in_ep = ep->bEndpointAddress;
sr_dbg("Bulk IN EP %d", uscpi->bulk_in_ep);
}
if (ep->bmAttributes == LIBUSB_TRANSFER_TYPE_INTERRUPT &&
ep->bEndpointAddress & (LIBUSB_ENDPOINT_DIR_MASK)) {
uscpi->interrupt_ep = ep->bEndpointAddress;
sr_dbg("Interrupt EP %d", uscpi->interrupt_ep);
}
}
found = 1;
uscpi->rigol_ds1000 = des.idVendor == 0x1ab1 &&
des.idProduct == 0x0588;
}
libusb_free_config_descriptor(confdes);
if (found)
break;
}
if (!found) {
sr_err("Failed to find USBTMC interface.");
return SR_ERR;
}
if (libusb_kernel_driver_active(usb->devhdl, uscpi->interface) == 1) {
if ((ret = libusb_detach_kernel_driver(usb->devhdl,
uscpi->interface)) < 0) {
sr_err("Failed to detach kernel driver: %s.",
libusb_error_name(ret));
return SR_ERR;
}
uscpi->detached_kernel_driver = 1;
}
if ((ret = libusb_set_configuration(usb->devhdl, config)) < 0) {
sr_err("Failed to set configuration: %s.",
libusb_error_name(ret));
return SR_ERR;
}
if ((ret = libusb_claim_interface(usb->devhdl, uscpi->interface)) < 0) {
sr_err("Failed to claim interface: %s.",
libusb_error_name(ret));
return SR_ERR;
}
if (!uscpi->rigol_ds1000) {
if ((ret = libusb_clear_halt(usb->devhdl, uscpi->bulk_in_ep)) < 0) {
sr_err("Failed to clear halt/stall condition for EP %d: %s.",
uscpi->bulk_in_ep, libusb_error_name(ret));
return SR_ERR;
}
if ((ret = libusb_clear_halt(usb->devhdl, uscpi->bulk_out_ep)) < 0) {
sr_err("Failed to clear halt/stall condition for EP %d: %s.",
uscpi->bulk_out_ep, libusb_error_name(ret));
return SR_ERR;
}
if ((ret = libusb_clear_halt(usb->devhdl, uscpi->interrupt_ep)) < 0) {
sr_err("Failed to clear halt/stall condition for EP %d: %s.",
uscpi->interrupt_ep, libusb_error_name(ret));
return SR_ERR;
}
}
/* Get capabilities. */
ret = libusb_control_transfer(usb->devhdl,
LIBUSB_ENDPOINT_IN |
LIBUSB_REQUEST_TYPE_CLASS |
LIBUSB_RECIPIENT_INTERFACE,
GET_CAPABILITIES, 0,
uscpi->interface,
capabilities, sizeof(capabilities),
TRANSFER_TIMEOUT);
if (ret == sizeof(capabilities)) {
uscpi->usbtmc_int_cap = capabilities[ 4];
uscpi->usbtmc_dev_cap = capabilities[ 5];
uscpi->usb488_dev_cap = capabilities[15];
}
sr_dbg("Device capabilities: %s%s%s%s%s, %s, %s",
uscpi->usb488_dev_cap & USB488_DEV_CAP_SCPI ? "SCPI, " : "",
uscpi->usbtmc_dev_cap & USBTMC_DEV_CAP_TERMCHAR ? "TermChar, ": "",
uscpi->usbtmc_int_cap & USBTMC_INT_CAP_LISTEN_ONLY? "L3, " :
uscpi->usbtmc_int_cap & USBTMC_INT_CAP_TALK_ONLY ? "" : "L4, ",
uscpi->usbtmc_int_cap & USBTMC_INT_CAP_TALK_ONLY ? "T5, " :
uscpi->usbtmc_int_cap & USBTMC_INT_CAP_LISTEN_ONLY? "" : "T6, ",
uscpi->usb488_dev_cap & USB488_DEV_CAP_SR1 ? "SR1" : "SR0",
uscpi->usb488_dev_cap & USB488_DEV_CAP_RL1 ? "RL1" : "RL0",
uscpi->usb488_dev_cap & USB488_DEV_CAP_DT1 ? "DT1" : "DT0");
return SR_OK;
}
static int scpi_usbtmc_libusb_source_add(void *priv, int events, int timeout,
sr_receive_data_callback_t cb, void *cb_data)
{
struct scpi_usbtmc_libusb *uscpi = priv;
(void)events;
return usb_source_add(uscpi->ctx, timeout, cb, cb_data);
}
static int scpi_usbtmc_libusb_source_remove(void *priv)
{
struct scpi_usbtmc_libusb *uscpi = priv;
return usb_source_remove(uscpi->ctx);
}
static void usbtmc_bulk_out_header_write(void *header, uint8_t MsgID,
uint8_t bTag,
uint32_t TransferSize,
uint8_t bmTransferAttributes,
char TermChar)
{
W8(header+ 0, MsgID);
W8(header+ 1, bTag);
W8(header+ 2, ~bTag);
W8(header+ 3, 0);
WL32(header+ 4, TransferSize);
W8(header+ 8, bmTransferAttributes);
W8(header+ 9, TermChar);
WL16(header+10, 0);
}
static int usbtmc_bulk_in_header_read(void *header, uint8_t MsgID,
unsigned char bTag,
int32_t *TransferSize,
uint8_t *bmTransferAttributes)
{
if (R8(header+0) != MsgID ||
R8(header+1) != bTag ||
R8(header+2) != (unsigned char)~bTag)
return SR_ERR;
if (TransferSize)
*TransferSize = RL32(header+4);
if (bmTransferAttributes)
*bmTransferAttributes = R8(header+8);
return SR_OK;
}
static int scpi_usbtmc_bulkout(struct scpi_usbtmc_libusb *uscpi,
uint8_t msg_id, const void *data, int32_t size,
uint8_t transfer_attributes)
{
struct sr_usb_dev_inst *usb = uscpi->usb;
int padded_size, ret, transferred;
if (data && size+USBTMC_BULK_HEADER_SIZE+3 > (int)sizeof(uscpi->buffer)) {
sr_err("USBTMC bulk out transfer is too big.");
return SR_ERR;
}
uscpi->bTag++;
uscpi->bTag += !uscpi->bTag; /* bTag == 0 is invalid so avoid it. */
usbtmc_bulk_out_header_write(uscpi->buffer, msg_id, uscpi->bTag,
size, transfer_attributes, 0);
if (data)
memcpy(uscpi->buffer+USBTMC_BULK_HEADER_SIZE, data, size);
else
size = 0;
size += USBTMC_BULK_HEADER_SIZE;
padded_size = (size + 3) & ~0x3;
memset(uscpi->buffer+size, 0, padded_size - size);
ret = libusb_bulk_transfer(usb->devhdl, uscpi->bulk_out_ep,
uscpi->buffer, padded_size, &transferred,
TRANSFER_TIMEOUT);
if (ret < 0) {
sr_err("USBTMC bulk out transfer error: %s.",
libusb_error_name(ret));
return SR_ERR;
}
if (transferred < padded_size) {
sr_dbg("USBTMC bulk out partial transfer (%d/%d bytes).",
transferred, padded_size);
return SR_ERR;
}
return transferred - USBTMC_BULK_HEADER_SIZE;
}
static int scpi_usbtmc_bulkin_start(struct scpi_usbtmc_libusb *uscpi,
uint8_t msg_id, void *data, int32_t size,
uint8_t *transfer_attributes)
{
struct sr_usb_dev_inst *usb = uscpi->usb;
int ret, transferred, message_size;
ret = libusb_bulk_transfer(usb->devhdl, uscpi->bulk_in_ep, data, size,
&transferred, TRANSFER_TIMEOUT);
if (ret < 0) {
sr_err("USBTMC bulk in transfer error: %s.",
libusb_error_name(ret));
return SR_ERR;
}
if (usbtmc_bulk_in_header_read(data, msg_id, uscpi->bTag, &message_size,
transfer_attributes) != SR_OK) {
sr_err("USBTMC invalid bulk in header.");
return SR_ERR;
}
message_size += USBTMC_BULK_HEADER_SIZE;
uscpi->response_length = MIN(transferred, message_size);
uscpi->response_bytes_read = USBTMC_BULK_HEADER_SIZE;
uscpi->remaining_length = message_size - uscpi->response_length;
return transferred - USBTMC_BULK_HEADER_SIZE;
}
static int scpi_usbtmc_bulkin_continue(struct scpi_usbtmc_libusb *uscpi,
void *data, int size)
{
struct sr_usb_dev_inst *usb = uscpi->usb;
int ret, transferred;
ret = libusb_bulk_transfer(usb->devhdl, uscpi->bulk_in_ep, data, size,
&transferred, TRANSFER_TIMEOUT);
if (ret < 0) {
sr_err("USBTMC bulk in transfer error: %s.",
libusb_error_name(ret));
return SR_ERR;
}
uscpi->response_length = MIN(transferred, uscpi->remaining_length);
uscpi->response_bytes_read = 0;
uscpi->remaining_length -= uscpi->response_length;
return transferred;
}
static int scpi_usbtmc_libusb_send(void *priv, const char *command)
{
struct scpi_usbtmc_libusb *uscpi = priv;
if (scpi_usbtmc_bulkout(uscpi, DEV_DEP_MSG_OUT,
command, strlen(command), EOM) <= 0)
return SR_ERR;
sr_spew("Successfully sent SCPI command: '%s'.", command);
return SR_OK;
}
static int scpi_usbtmc_libusb_read_begin(void *priv)
{
struct scpi_usbtmc_libusb *uscpi = priv;
uscpi->remaining_length = 0;
if (scpi_usbtmc_bulkout(uscpi, REQUEST_DEV_DEP_MSG_IN,
NULL, INT32_MAX, 0) < 0)
return SR_ERR;
if (scpi_usbtmc_bulkin_start(uscpi, DEV_DEP_MSG_IN,
uscpi->buffer, sizeof(uscpi->buffer),
&uscpi->bulkin_attributes) < 0)
return SR_ERR;
return SR_OK;
}
static int scpi_usbtmc_libusb_read_data(void *priv, char *buf, int maxlen)
{
struct scpi_usbtmc_libusb *uscpi = priv;
int read_length;
if (uscpi->response_bytes_read >= uscpi->response_length) {
if (uscpi->remaining_length > 0) {
if (scpi_usbtmc_bulkin_continue(uscpi, uscpi->buffer,
sizeof(uscpi->buffer)) <= 0)
return SR_ERR;
} else {
if (uscpi->bulkin_attributes & EOM)
return SR_ERR;
if (scpi_usbtmc_libusb_read_begin(uscpi) < 0)
return SR_ERR;
}
}
read_length = MIN(uscpi->response_length - uscpi->response_bytes_read, maxlen);
memcpy(buf, uscpi->buffer + uscpi->response_bytes_read, read_length);
uscpi->response_bytes_read += read_length;
return read_length;
}
static int scpi_usbtmc_libusb_read_complete(void *priv)
{
struct scpi_usbtmc_libusb *uscpi = priv;
return uscpi->response_bytes_read >= uscpi->response_length &&
uscpi->remaining_length <= 0 &&
uscpi->bulkin_attributes & EOM;
}
static int scpi_usbtmc_libusb_close(void *priv)
{
int ret;
struct scpi_usbtmc_libusb *uscpi = priv;
struct sr_usb_dev_inst *usb = uscpi->usb;
if (!usb->devhdl)
return SR_ERR;
if (!uscpi->rigol_ds1000) {
if ((ret = libusb_clear_halt(usb->devhdl, uscpi->bulk_in_ep)) < 0)
sr_err("Failed to clear halt/stall condition for EP %d: %s.",
uscpi->bulk_in_ep, libusb_error_name(ret));
if ((ret = libusb_clear_halt(usb->devhdl, uscpi->bulk_out_ep)) < 0)
sr_err("Failed to clear halt/stall condition for EP %d: %s.",
uscpi->bulk_out_ep, libusb_error_name(ret));
if ((ret = libusb_clear_halt(usb->devhdl, uscpi->interrupt_ep)) < 0)
sr_err("Failed to clear halt/stall condition for EP %d: %s.",
uscpi->interrupt_ep, libusb_error_name(ret));
}
if ((ret = libusb_release_interface(usb->devhdl, uscpi->interface)) < 0)
sr_err("Failed to release interface: %s.",
libusb_error_name(ret));
if (uscpi->detached_kernel_driver) {
if ((ret = libusb_attach_kernel_driver(usb->devhdl,
uscpi->interface)) < 0)
sr_err("Failed to re-attach kernel driver: %s.",
libusb_error_name(ret));
uscpi->detached_kernel_driver = 0;
}
libusb_close(usb->devhdl);
usb->devhdl = NULL;
return SR_OK;
}
static void scpi_usbtmc_libusb_free(void *priv)
{
struct scpi_usbtmc_libusb *uscpi = priv;
sr_usb_dev_inst_free(uscpi->usb);
}
SR_PRIV const struct sr_scpi_dev_inst scpi_usbtmc_libusb_dev = {
.name = "USBTMC",
.prefix = "usbtmc",
.priv_size = sizeof(struct scpi_usbtmc_libusb),
.scan = scpi_usbtmc_libusb_scan,
.dev_inst_new = scpi_usbtmc_libusb_dev_inst_new,
.open = scpi_usbtmc_libusb_open,
.source_add = scpi_usbtmc_libusb_source_add,
.source_remove = scpi_usbtmc_libusb_source_remove,
.send = scpi_usbtmc_libusb_send,
.read_begin = scpi_usbtmc_libusb_read_begin,
.read_data = scpi_usbtmc_libusb_read_data,
.read_complete = scpi_usbtmc_libusb_read_complete,
.close = scpi_usbtmc_libusb_close,
.free = scpi_usbtmc_libusb_free,
};
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