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

511 lines
12 KiB
C

/*
* 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 <glib.h>
#include <libusb.h>
#include "libsigrok.h"
#include "libsigrok-internal.h"
#include "protocol.h"
SR_PRIV struct sr_dev_inst *lascar_scan(int bus, int address);
SR_PRIV struct sr_dev_driver lascar_el_usb_driver_info;
static struct sr_dev_driver *di = &lascar_el_usb_driver_info;
static int hw_dev_close(struct sr_dev_inst *sdi);
static const int hwopts[] = {
SR_HWOPT_CONN,
0,
};
static const int hwcaps[] = {
SR_HWCAP_THERMOMETER,
SR_HWCAP_HYGROMETER,
SR_HWCAP_LIMIT_SAMPLES,
0
};
static const char *probe_names[] = {
"P1",
};
/* Properly close and free all devices. */
static int clear_instances(void)
{
struct sr_dev_inst *sdi;
struct drv_context *drvc;
struct dev_context *devc;
GSList *l;
if (!(drvc = di->priv))
return SR_OK;
for (l = drvc->instances; l; l = l->next) {
if (!(sdi = l->data))
continue;
if (!(devc = sdi->priv))
continue;
hw_dev_close(sdi);
sr_usb_dev_inst_free(devc->usb);
sr_dev_inst_free(sdi);
}
g_slist_free(drvc->instances);
drvc->instances = NULL;
return SR_OK;
}
static int hw_init(struct sr_context *sr_ctx)
{
struct drv_context *drvc;
if (!(drvc = g_try_malloc0(sizeof(struct drv_context)))) {
sr_err("Driver context malloc failed.");
return SR_ERR_MALLOC;
}
drvc->sr_ctx = sr_ctx;
di->priv = drvc;
return SR_OK;
}
static GSList *hw_scan(GSList *options)
{
struct drv_context *drvc;
struct dev_context *devc;
struct sr_dev_inst *sdi;
struct sr_usb_dev_inst *usb;
struct sr_hwopt *opt;
GSList *usb_devices, *devices, *l;
const char *conn;
(void)options;
if (!(drvc = di->priv)) {
sr_err("Driver was not initialized.");
return NULL;
}
/* USB scan is always authoritative. */
clear_instances();
conn = NULL;
for (l = options; l; l = l->next) {
opt = l->data;
switch (opt->hwopt) {
case SR_HWOPT_CONN:
conn = opt->value;
break;
}
}
if (!conn)
return NULL;
devices = NULL;
if ((usb_devices = sr_usb_find(drvc->sr_ctx->libusb_ctx, conn))) {
/* We have a list of sr_usb_dev_inst matching the connection
* string. Wrap them in sr_dev_inst and we're done. */
for (l = usb_devices; l; l = l->next) {
usb = l->data;
if (!(sdi = lascar_scan(usb->bus, usb->address))) {
/* Not a Lascar EL-USB. */
g_free(usb);
continue;
}
devc = sdi->priv;
devc->usb = usb;
drvc->instances = g_slist_append(drvc->instances, sdi);
devices = g_slist_append(devices, sdi);
}
g_slist_free(usb_devices);
} else
g_slist_free_full(usb_devices, g_free);
return devices;
}
static GSList *hw_dev_list(void)
{
struct drv_context *drvc;
if (!(drvc = di->priv)) {
sr_err("Driver was not initialized.");
return NULL;
}
return drvc->instances;
}
static int hw_dev_open(struct sr_dev_inst *sdi)
{
struct drv_context *drvc;
struct dev_context *devc;
int ret;
if (!(drvc = di->priv)) {
sr_err("Driver was not initialized.");
return SR_ERR;
}
devc = sdi->priv;
if (sr_usb_open(drvc->sr_ctx->libusb_ctx, devc->usb) != SR_OK)
return SR_ERR;
if ((ret = libusb_claim_interface(devc->usb->devhdl, LASCAR_INTERFACE))) {
sr_err("Failed to claim interface: %s.", libusb_error_name(ret));
return SR_ERR;
}
sdi->status = SR_ST_ACTIVE;
return ret;
}
static int hw_dev_close(struct sr_dev_inst *sdi)
{
struct dev_context *devc;
if (!di->priv) {
sr_err("Driver was not initialized.");
return SR_ERR;
}
devc = sdi->priv;
if (!devc->usb->devhdl)
/* Nothing to do. */
return SR_OK;
libusb_release_interface(devc->usb->devhdl, LASCAR_INTERFACE);
libusb_close(devc->usb->devhdl);
devc->usb->devhdl = NULL;
g_free(devc->config);
sdi->status = SR_ST_INACTIVE;
return SR_OK;
}
static int hw_cleanup(void)
{
struct drv_context *drvc;
if (!(drvc = di->priv))
/* Can get called on an unused driver, doesn't matter. */
return SR_OK;
clear_instances();
g_free(drvc);
di->priv = NULL;
return SR_OK;
}
static int hw_info_get(int info_id, const void **data,
const struct sr_dev_inst *sdi)
{
(void)sdi;
switch (info_id) {
case SR_DI_HWOPTS:
*data = hwopts;
break;
case SR_DI_HWCAPS:
*data = hwcaps;
break;
case SR_DI_NUM_PROBES:
*data = GINT_TO_POINTER(1);
break;
case SR_DI_PROBE_NAMES:
*data = probe_names;
break;
default:
sr_err("Unknown info_id: %d.", info_id);
return SR_ERR_ARG;
}
return SR_OK;
}
static int hw_dev_config_set(const struct sr_dev_inst *sdi, int hwcap,
const void *value)
{
struct dev_context *devc;
int ret;
if (!di->priv) {
sr_err("Driver was not initialized.");
return SR_ERR;
}
if (sdi->status != SR_ST_ACTIVE) {
sr_err("Device inactive, can't set config options.");
return SR_ERR;
}
devc = sdi->priv;
ret = SR_OK;
switch (hwcap) {
case SR_HWCAP_LIMIT_SAMPLES:
devc->limit_samples = *(const uint64_t *)value;
sr_dbg("Setting sample limit to %" PRIu64 ".",
devc->limit_samples);
break;
default:
sr_err("Unknown hardware capability: %d.", hwcap);
ret = SR_ERR_ARG;
}
return ret;
}
static void mark_xfer(struct libusb_transfer *xfer)
{
if (xfer->status == LIBUSB_TRANSFER_COMPLETED)
xfer->user_data = GINT_TO_POINTER(1);
else
xfer->user_data = GINT_TO_POINTER(-1);
}
/* The Lascar software, in its infinite ignorance, reads a set of four
* bytes from the device config struct and interprets it as a float.
* That only works because they only use windows, and only on x86. However
* we may be running on any architecture, any operating system. So we have
* to convert these four bytes as the Lascar software would on windows/x86,
* to the local representation of a float.
* The source format is little-endian, with IEEE 754-2008 BINARY32 encoding. */
static float binary32_le_to_float(unsigned char *buf)
{
GFloatIEEE754 f;
f.v_float = 0;
f.mpn.sign = (buf[3] & 0x80) ? 1 : 0;
f.mpn.biased_exponent = (buf[3] << 1) | (buf[2] >> 7);
f.mpn.mantissa = buf[0] | (buf[1] << 8) | ((buf[2] & 0x7f) << 16);
return f.v_float;
}
static int lascar_proc_config(const struct sr_dev_inst *sdi)
{
struct dev_context *devc;
int ret;
devc = sdi->priv;
if (!(devc->config = lascar_get_config(devc->usb->devhdl)))
return SR_ERR;
ret = SR_OK;
switch (devc->profile->logformat) {
case LOG_TEMP_RH:
devc->sample_size = 2;
devc->temp_unit = devc->config[0x2e] | (devc->config[0x2f] << 8);
if (devc->temp_unit != 0 && devc->temp_unit != 1) {
sr_dbg("invalid temperature unit %d", devc->temp_unit);
/* Default to Celcius, we're all adults here. */
devc->temp_unit = 0;
} else
sr_dbg("temperature unit is %s", devc->temp_unit
? "Fahrenheit" : "Celcius");
break;
case LOG_CO:
devc->sample_size = 2;
devc->co_high = binary32_le_to_float(devc->config + 0x24);
devc->co_low = binary32_le_to_float(devc->config + 0x28);
sr_dbg("EL-USB-CO calibration high %f low %f", devc->co_high,
devc->co_low);
break;
default:
ret = SR_ERR_ARG;
}
devc->logged_samples = devc->config[0x1e] | (devc->config[0x1f] << 8);
sr_dbg("device log contains %d samples.", devc->logged_samples);
return ret;
}
static int hw_dev_acquisition_start(const struct sr_dev_inst *sdi,
void *cb_data)
{
struct sr_datafeed_packet packet;
struct sr_datafeed_header header;
struct sr_datafeed_meta_analog meta;
struct dev_context *devc;
struct drv_context *drvc = di->priv;
struct libusb_transfer *xfer_in, *xfer_out;
const struct libusb_pollfd **pfd;
struct timeval tv;
int ret, i;
unsigned char cmd[3], resp[4], *buf;
if (!di->priv) {
sr_err("Driver was not initialized.");
return SR_ERR;
}
devc = sdi->priv;
devc->cb_data = cb_data;
if (lascar_proc_config(sdi) != SR_OK)
return SR_ERR;
sr_dbg("Starting log retrieval.");
/* Send header packet to the session bus. */
sr_dbg("Sending SR_DF_HEADER.");
packet.type = SR_DF_HEADER;
packet.payload = (uint8_t *)&header;
header.feed_version = 1;
sr_session_send(devc->cb_data, &packet);
if (devc->logged_samples == 0) {
/* This ensures the frontend knows the session is done. */
packet.type = SR_DF_END;
sr_session_send(devc->cb_data, &packet);
return SR_OK;
}
if (!(xfer_in = libusb_alloc_transfer(0)) ||
!(xfer_out = libusb_alloc_transfer(0)))
return SR_ERR;
libusb_control_transfer(devc->usb->devhdl, LIBUSB_REQUEST_TYPE_VENDOR,
0x00, 0xffff, 0x00, NULL, 0, 50);
libusb_control_transfer(devc->usb->devhdl, LIBUSB_REQUEST_TYPE_VENDOR,
0x02, 0x0002, 0x00, NULL, 0, 50);
libusb_control_transfer(devc->usb->devhdl, LIBUSB_REQUEST_TYPE_VENDOR,
0x02, 0x0001, 0x00, NULL, 0, 50);
/* Flush input. The F321 requires this. */
while (libusb_bulk_transfer(devc->usb->devhdl, LASCAR_EP_IN, resp,
256, &ret, 5) == 0 && ret > 0)
;
libusb_fill_bulk_transfer(xfer_in, devc->usb->devhdl, LASCAR_EP_IN,
resp, sizeof(resp), mark_xfer, 0, 10000);
if (libusb_submit_transfer(xfer_in) != 0) {
libusb_free_transfer(xfer_in);
libusb_free_transfer(xfer_out);
return SR_ERR;
}
cmd[0] = 0x03;
cmd[1] = 0xff;
cmd[2] = 0xff;
libusb_fill_bulk_transfer(xfer_out, devc->usb->devhdl, LASCAR_EP_OUT,
cmd, 3, mark_xfer, 0, 100);
if (libusb_submit_transfer(xfer_out) != 0) {
libusb_free_transfer(xfer_in);
libusb_free_transfer(xfer_out);
return SR_ERR;
}
tv.tv_sec = 0;
tv.tv_usec = 0;
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->user_data != GINT_TO_POINTER(1) ||
xfer_in->user_data != GINT_TO_POINTER(1)) {
sr_dbg("no response to log transfer request");
libusb_free_transfer(xfer_in);
libusb_free_transfer(xfer_out);
return SR_ERR;
}
if (xfer_in->actual_length != 3 || xfer_in->buffer[0] != 2) {
sr_dbg("invalid response to log transfer request");
libusb_free_transfer(xfer_in);
libusb_free_transfer(xfer_out);
return SR_ERR;
}
devc->log_size = xfer_in->buffer[1] + (xfer_in->buffer[2] << 8);
libusb_free_transfer(xfer_out);
/* Send metadata about the SR_DF_ANALOG packets to come. */
packet.type = SR_DF_META_ANALOG;
packet.payload = &meta;
meta.num_probes = 1;
sr_session_send(devc->cb_data, &packet);
pfd = libusb_get_pollfds(drvc->sr_ctx->libusb_ctx);
for (i = 0; pfd[i]; i++) {
/* Handle USB events every 100ms, for decent latency. */
sr_source_add(pfd[i]->fd, pfd[i]->events, 100,
lascar_el_usb_handle_events, (void *)sdi);
/* We'll need to remove this fd later. */
devc->usbfd[i] = pfd[i]->fd;
}
devc->usbfd[i] = -1;
buf = g_try_malloc(4096);
libusb_fill_bulk_transfer(xfer_in, devc->usb->devhdl, LASCAR_EP_IN,
buf, 4096, lascar_el_usb_receive_transfer, cb_data, 100);
if ((ret = libusb_submit_transfer(xfer_in) != 0)) {
sr_err("Unable to submit transfer: %s.", libusb_error_name(ret));
libusb_free_transfer(xfer_in);
g_free(buf);
return SR_ERR;
}
return SR_OK;
}
SR_PRIV int hw_dev_acquisition_stop(struct sr_dev_inst *sdi, void *cb_data)
{
(void)cb_data;
if (!di->priv) {
sr_err("Driver was not initialized.");
return SR_ERR;
}
if (sdi->status != SR_ST_ACTIVE) {
sr_err("Device inactive, can't stop acquisition.");
return SR_ERR;
}
sdi->status = SR_ST_STOPPING;
/* TODO: free ongoing transfers? */
return SR_OK;
}
SR_PRIV struct sr_dev_driver lascar_el_usb_driver_info = {
.name = "lascar-el-usb",
.longname = "Lascar EL-USB",
.api_version = 1,
.init = hw_init,
.cleanup = hw_cleanup,
.scan = hw_scan,
.dev_list = hw_dev_list,
.dev_clear = clear_instances,
.dev_open = hw_dev_open,
.dev_close = hw_dev_close,
.info_get = hw_info_get,
.dev_config_set = hw_dev_config_set,
.dev_acquisition_start = hw_dev_acquisition_start,
.dev_acquisition_stop = hw_dev_acquisition_stop,
.priv = NULL,
};