libsigrok/hardware/lascar-el-usb/protocol.c

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/*
* This file is part of the libsigrok project.
*
* Copyright (C) 2012 Bert Vermeulen <bert@biot.com>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <stdlib.h>
#include <sys/time.h>
#include <string.h>
#include <math.h>
#include <glib.h>
#include "libsigrok.h"
#include "libsigrok-internal.h"
#include "protocol.h"
extern struct sr_dev_driver lascar_el_usb_driver_info;
static struct sr_dev_driver *di = &lascar_el_usb_driver_info;
static const struct elusb_profile profiles[] = {
{ 1, "EL-USB-1", LOG_UNSUPPORTED },
{ 2, "EL-USB-1", LOG_UNSUPPORTED },
{ 3, "EL-USB-2", LOG_TEMP_RH },
{ 4, "EL-USB-3", LOG_UNSUPPORTED },
{ 5, "EL-USB-4", LOG_UNSUPPORTED },
{ 6, "EL-USB-3", LOG_UNSUPPORTED },
{ 7, "EL-USB-4", LOG_UNSUPPORTED },
{ 8, "EL-USB-LITE", LOG_UNSUPPORTED },
{ 9, "EL-USB-CO", LOG_CO },
{ 10, "EL-USB-TC", LOG_UNSUPPORTED },
{ 11, "EL-USB-CO300", LOG_CO },
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{ 12, "EL-USB-2-LCD", LOG_TEMP_RH },
{ 13, "EL-USB-2+", LOG_TEMP_RH },
{ 14, "EL-USB-1-PRO", LOG_UNSUPPORTED },
{ 15, "EL-USB-TC-LCD", LOG_UNSUPPORTED },
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{ 16, "EL-USB-2-LCD+", LOG_TEMP_RH },
{ 17, "EL-USB-5", LOG_UNSUPPORTED },
{ 18, "EL-USB-1-RCG", LOG_UNSUPPORTED },
{ 19, "EL-USB-1-LCD", LOG_UNSUPPORTED },
{ 20, "EL-OEM-3", LOG_UNSUPPORTED },
{ 21, "EL-USB-1-LCD", LOG_UNSUPPORTED },
{ 0, NULL, 0 }
};
SR_PRIV libusb_device_handle *lascar_open(struct libusb_device *dev)
{
libusb_device_handle *dev_hdl;
int ret;
if ((ret = libusb_open(dev, &dev_hdl)) != 0) {
sr_dbg("failed to open device for scan: %s",
libusb_error_name(ret));
return NULL;
}
/* Some of these fail, but it needs doing -- some sort of mode
* setup for the SILabs F32x. */
libusb_control_transfer(dev_hdl, LIBUSB_REQUEST_TYPE_VENDOR,
0x00, 0xffff, 0x00, NULL, 0, 50);
libusb_control_transfer(dev_hdl, LIBUSB_REQUEST_TYPE_VENDOR,
0x02, 0x0002, 0x00, NULL, 0, 50);
libusb_control_transfer(dev_hdl, LIBUSB_REQUEST_TYPE_VENDOR,
0x02, 0x0001, 0x00, NULL, 0, 50);
return dev_hdl;
}
static void mark_xfer(struct libusb_transfer *xfer)
{
xfer->user_data = GINT_TO_POINTER(1);
}
SR_PRIV unsigned char *lascar_get_config(libusb_device_handle *dev_hdl)
{
struct drv_context *drvc;
struct libusb_transfer *xfer_in, *xfer_out;
struct timeval tv;
int64_t start;
int buflen;
unsigned char cmd[3], buf[256], *config;
drvc = di->priv;
config = NULL;
if (!(xfer_in = libusb_alloc_transfer(0)) ||
!(xfer_out = libusb_alloc_transfer(0)))
return NULL;
/* Flush anything the F321 still has queued. */
while (libusb_bulk_transfer(dev_hdl, LASCAR_EP_IN, buf, 256, &buflen,
5) == 0 && buflen > 0)
;
/* Keep a read request waiting in the wings, ready to pounce
* the moment the device sends something. */
libusb_fill_bulk_transfer(xfer_in, dev_hdl, LASCAR_EP_IN,
buf, 256, mark_xfer, 0, 10000);
if (libusb_submit_transfer(xfer_in) != 0)
goto cleanup;
/* Request device configuration structure. */
cmd[0] = 0x00;
cmd[1] = 0xff;
cmd[2] = 0xff;
libusb_fill_bulk_transfer(xfer_out, dev_hdl, LASCAR_EP_OUT,
cmd, 3, mark_xfer, 0, 100);
if (libusb_submit_transfer(xfer_out) != 0)
goto cleanup;
tv.tv_sec = 0;
tv.tv_usec = 0;
start = g_get_monotonic_time();
while (!xfer_in->user_data || !xfer_out->user_data) {
if (g_get_monotonic_time() - start > SCAN_TIMEOUT) {
start = 0;
break;
}
g_usleep(5000);
libusb_handle_events_timeout(drvc->sr_ctx->libusb_ctx, &tv);
}
if (!start) {
sr_dbg("no response");
goto cleanup;
}
if (xfer_in->actual_length != 3) {
sr_dbg("expected 3-byte header, got %d bytes", xfer_in->actual_length);
goto cleanup;
}
/* Got configuration structure header. */
sr_dbg("response to config request: 0x%.2x 0x%.2x 0x%.2x ",
buf[0], buf[1], buf[2]);
buflen = buf[1] | (buf[2] << 8);
if (buf[0] != 0x02 || buflen > 256) {
sr_dbg("Invalid response to config request: "
"0x%.2x 0x%.2x 0x%.2x ", buf[0], buf[1], buf[2]);
libusb_close(dev_hdl);
goto cleanup;
}
/* Get configuration structure. */
xfer_in->length = buflen;
xfer_in->user_data = 0;
if (libusb_submit_transfer(xfer_in) != 0)
goto cleanup;
while (!xfer_in->user_data) {
if (g_get_monotonic_time() - start > SCAN_TIMEOUT) {
start = 0;
break;
}
g_usleep(5000);
libusb_handle_events_timeout(drvc->sr_ctx->libusb_ctx, &tv);
}
if (!start) {
sr_dbg("Timeout waiting for configuration structure.");
goto cleanup;
}
if (xfer_in->actual_length != buflen) {
sr_dbg("expected %d-byte structure, got %d bytes", buflen,
xfer_in->actual_length);
goto cleanup;
}
if (!(config = g_try_malloc(256)))
return NULL;
memcpy(config, buf, buflen);
cleanup:
if (!xfer_in->user_data || !xfer_in->user_data) {
if (!xfer_in->user_data)
libusb_cancel_transfer(xfer_in);
if (!xfer_out->user_data)
libusb_cancel_transfer(xfer_out);
start = g_get_monotonic_time();
while (!xfer_in->user_data || !xfer_out->user_data) {
if (g_get_monotonic_time() - start > 10000)
break;
g_usleep(1000);
libusb_handle_events_timeout(drvc->sr_ctx->libusb_ctx, &tv);
}
}
libusb_free_transfer(xfer_in);
libusb_free_transfer(xfer_out);
return config;
}
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/* Currently unused. */
SR_PRIV int lascar_save_config(libusb_device_handle *dev_hdl,
unsigned char *config, int configlen)
{
struct drv_context *drvc;
struct libusb_transfer *xfer_in, *xfer_out;
struct timeval tv;
int64_t start;
int buflen, ret;
unsigned char cmd[3], buf[256];
drvc = di->priv;
if (!(xfer_in = libusb_alloc_transfer(0)) ||
!(xfer_out = libusb_alloc_transfer(0)))
return SR_ERR;
/* Flush anything the F321 still has queued. */
while (libusb_bulk_transfer(dev_hdl, LASCAR_EP_IN, buf, 256, &buflen,
5) == 0 && buflen > 0)
;
ret = SR_OK;
/* Keep a read request waiting in the wings, ready to pounce
* the moment the device sends something. */
libusb_fill_bulk_transfer(xfer_in, dev_hdl, LASCAR_EP_IN,
buf, 256, mark_xfer, 0, 10000);
if (libusb_submit_transfer(xfer_in) != 0) {
ret = SR_ERR;
goto cleanup;
}
/* Request device configuration structure. */
cmd[0] = 0x01;
cmd[1] = configlen & 0xff;
cmd[2] = (configlen >> 8) & 0xff;
libusb_fill_bulk_transfer(xfer_out, dev_hdl, LASCAR_EP_OUT,
cmd, 3, mark_xfer, 0, 100);
if (libusb_submit_transfer(xfer_out) != 0) {
ret = SR_ERR;
goto cleanup;
}
tv.tv_sec = 0;
tv.tv_usec = 0;
while (!xfer_out->user_data) {
g_usleep(5000);
libusb_handle_events_timeout(drvc->sr_ctx->libusb_ctx, &tv);
}
libusb_fill_bulk_transfer(xfer_out, dev_hdl, LASCAR_EP_OUT,
config, configlen, mark_xfer, 0, 100);
if (libusb_submit_transfer(xfer_out) != 0) {
ret = SR_ERR;
goto cleanup;
}
while (!xfer_in->user_data || !xfer_out->user_data) {
g_usleep(5000);
libusb_handle_events_timeout(drvc->sr_ctx->libusb_ctx, &tv);
}
if (xfer_in->actual_length != 1 || buf[0] != 0xff) {
sr_dbg("unexpected response after transfer");
ret = SR_ERR;
}
cleanup:
if (!xfer_in->user_data || !xfer_in->user_data) {
if (!xfer_in->user_data)
libusb_cancel_transfer(xfer_in);
if (!xfer_out->user_data)
libusb_cancel_transfer(xfer_out);
start = g_get_monotonic_time();
while (!xfer_in->user_data || !xfer_out->user_data) {
if (g_get_monotonic_time() - start > 10000)
break;
g_usleep(1000);
libusb_handle_events_timeout(drvc->sr_ctx->libusb_ctx, &tv);
}
}
libusb_free_transfer(xfer_in);
libusb_free_transfer(xfer_out);
return ret;
}
static struct sr_dev_inst *lascar_identify(unsigned char *config)
{
struct dev_context *devc;
const struct elusb_profile *profile;
struct sr_dev_inst *sdi;
struct sr_probe *probe;
int modelid, i;
char firmware[5];
modelid = config[0];
sdi = NULL;
if (modelid) {
profile = NULL;
for (i = 0; profiles[i].modelid; i++) {
if (profiles[i].modelid == modelid) {
profile = &profiles[i];
break;
}
}
if (!profile) {
sr_dbg("unknown EL-USB modelid %d", modelid);
return NULL;
}
i = config[52] | (config[53] << 8);
memcpy(firmware, config + 0x30, 4);
firmware[4] = '\0';
sr_dbg("found %s with firmware version %s serial %d",
profile->modelname, firmware, i);
if (profile->logformat == LOG_UNSUPPORTED) {
sr_dbg("unsupported EL-USB logformat for %s", profile->modelname);
return NULL;
}
if (!(sdi = sr_dev_inst_new(0, SR_ST_INACTIVE, LASCAR_VENDOR,
profile->modelname, firmware)))
return NULL;
sdi->driver = di;
if (!(probe = sr_probe_new(0, SR_PROBE_ANALOG, TRUE, "P1")))
return NULL;
sdi->probes = g_slist_append(NULL, probe);
if (!(devc = g_try_malloc0(sizeof(struct dev_context))))
return NULL;
sdi->priv = devc;
devc->profile = profile;
}
return sdi;
}
SR_PRIV struct sr_dev_inst *lascar_scan(int bus, int address)
{
struct drv_context *drvc;
struct sr_dev_inst *sdi;
struct libusb_device **devlist;
struct libusb_device_descriptor des;
libusb_device_handle *dev_hdl;
int ret, i;
unsigned char *config;
drvc = di->priv;
sdi = NULL;
libusb_get_device_list(drvc->sr_ctx->libusb_ctx, &devlist);
for (i = 0; devlist[i]; i++) {
if ((ret = libusb_get_device_descriptor(devlist[i], &des))) {
sr_err("Failed to get device descriptor: %d.", ret);
continue;
}
if (libusb_get_bus_number(devlist[i]) != bus ||
libusb_get_device_address(devlist[i]) != address)
continue;
if (!(dev_hdl = lascar_open(devlist[i])))
continue;
if (!(config = lascar_get_config(dev_hdl)))
continue;
libusb_close(dev_hdl);
sdi = lascar_identify(config);
g_free(config);
}
return sdi;
}
static void lascar_el_usb_dispatch(struct sr_dev_inst *sdi, unsigned char *buf,
int buflen)
{
struct dev_context *devc;
struct sr_datafeed_packet packet;
struct sr_datafeed_analog analog;
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float *temp, *rh;
uint16_t s;
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int samples, samples_left, i, j;
devc = sdi->priv;
analog.probes = sdi->probes;
samples = buflen / devc->sample_size;
samples_left = devc->logged_samples - devc->rcvd_samples;
if (samples_left < samples)
samples = samples_left;
switch (devc->profile->logformat) {
case LOG_TEMP_RH:
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packet.type = SR_DF_ANALOG;
packet.payload = &analog;
analog.mqflags = 0;
if (!(temp = g_try_malloc(sizeof(float) * samples)))
break;
if (!(rh = g_try_malloc(sizeof(float) * samples)))
break;
for (i = 0, j = 0; i < samples; i++) {
/* Both Celcius and Fahrenheit stored at base -40. */
if (devc->temp_unit == 0)
/* Celcius is stored in half-degree increments. */
temp[j] = buf[i * 2] / 2 - 40;
else
temp[j] = buf[i * 2] - 40;
rh[j] = buf[i * 2 + 1] / 2;
if (temp[j] == 0.0 && rh[j] == 0.0)
/* Skip invalid measurement. */
continue;
j++;
}
analog.num_samples = j;
analog.mq = SR_MQ_TEMPERATURE;
if (devc->temp_unit == 1)
analog.unit = SR_UNIT_FAHRENHEIT;
else
analog.unit = SR_UNIT_CELSIUS;
analog.data = temp;
sr_session_send(devc->cb_data, &packet);
analog.mq = SR_MQ_RELATIVE_HUMIDITY;
analog.unit = SR_UNIT_PERCENTAGE;
analog.data = rh;
sr_session_send(devc->cb_data, &packet);
g_free(temp);
g_free(rh);
break;
case LOG_CO:
packet.type = SR_DF_ANALOG;
packet.payload = &analog;
analog.num_samples = samples;
analog.mq = SR_MQ_CARBON_MONOXIDE;
analog.unit = SR_UNIT_CONCENTRATION;
analog.mqflags = 0;
if (!(analog.data = g_try_malloc(sizeof(float) * samples)))
break;
for (i = 0; i < samples; i++) {
s = (buf[i * 2] << 8) | buf[i * 2 + 1];
analog.data[i] = (s * devc->co_high + devc->co_low) / 1000000;
if (analog.data[i] < 0.0)
analog.data[i] = 0.0;
}
sr_session_send(devc->cb_data, &packet);
g_free(analog.data);
break;
default:
/* How did we even get this far? */
break;
}
devc->rcvd_samples += samples;
}
SR_PRIV int lascar_el_usb_handle_events(int fd, int revents, void *cb_data)
{
struct dev_context *devc;
struct drv_context *drvc = di->priv;
struct sr_datafeed_packet packet;
struct sr_dev_inst *sdi;
struct timeval tv;
int i;
(void)fd;
(void)revents;
sdi = cb_data;
devc = sdi->priv;
if (sdi->status == SR_ST_STOPPING) {
for (i = 0; devc->usbfd[i] != -1; i++)
sr_source_remove(devc->usbfd[i]);
sdi->driver->dev_close(sdi);
packet.type = SR_DF_END;
sr_session_send(cb_data, &packet);
}
memset(&tv, 0, sizeof(struct timeval));
libusb_handle_events_timeout_completed(drvc->sr_ctx->libusb_ctx, &tv,
NULL);
return TRUE;
}
SR_PRIV void lascar_el_usb_receive_transfer(struct libusb_transfer *transfer)
{
struct dev_context *devc;
struct sr_dev_inst *sdi;
int ret;
gboolean packet_has_error;
sdi = transfer->user_data;
devc = sdi->priv;
packet_has_error = FALSE;
switch (transfer->status) {
case LIBUSB_TRANSFER_NO_DEVICE:
/* USB device was unplugged. */
hw_dev_acquisition_stop(sdi, sdi);
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 (!packet_has_error) {
if (devc->rcvd_samples < devc->logged_samples)
lascar_el_usb_dispatch(sdi, transfer->buffer,
transfer->actual_length);
devc->rcvd_bytes += transfer->actual_length;
sr_spew("received %d/%d bytes (%d/%d samples)",
devc->rcvd_bytes, devc->log_size,
devc->rcvd_samples, devc->logged_samples);
if (devc->rcvd_bytes >= devc->log_size)
hw_dev_acquisition_stop(sdi, sdi);
}
if (sdi->status == SR_ST_ACTIVE) {
/* Send the same request again. */
if ((ret = libusb_submit_transfer(transfer) != 0)) {
sr_err("Unable to resubmit transfer: %s.",
libusb_error_name(ret));
g_free(transfer->buffer);
libusb_free_transfer(transfer);
hw_dev_acquisition_stop(sdi, sdi);
}
} else {
/* This was the last transfer we're going to receive, so
* clean up now. */
g_free(transfer->buffer);
libusb_free_transfer(transfer);
}
}