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

494 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_driver lascar_el_usb_driver_info;
static struct sr_dev_driver *di = &lascar_el_usb_driver_info;
static const int32_t hwopts[] = {
SR_CONF_CONN,
};
static const int32_t hwcaps[] = {
SR_CONF_THERMOMETER,
SR_CONF_HYGROMETER,
SR_CONF_DATALOG,
SR_CONF_LIMIT_SAMPLES,
};
static int dev_clear(void)
{
return std_dev_clear(di, NULL);
}
static int init(struct sr_context *sr_ctx)
{
return std_init(sr_ctx, di, LOG_PREFIX);
}
static GSList *scan(GSList *options)
{
struct drv_context *drvc;
struct sr_dev_inst *sdi;
struct sr_usb_dev_inst *usb;
struct sr_config *src;
GSList *usb_devices, *devices, *l;
const char *conn;
drvc = di->priv;
conn = NULL;
for (l = options; l; l = l->next) {
src = l->data;
switch (src->key) {
case SR_CONF_CONN:
conn = g_variant_get_string(src->data, NULL);
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;
}
sdi->inst_type = SR_INST_USB;
sdi->conn = 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 *dev_list(void)
{
return ((struct drv_context *)(di->priv))->instances;
}
static int dev_open(struct sr_dev_inst *sdi)
{
struct drv_context *drvc;
struct sr_usb_dev_inst *usb;
int ret;
if (!(drvc = di->priv)) {
sr_err("Driver was not initialized.");
return SR_ERR;
}
usb = sdi->conn;
if (sr_usb_open(drvc->sr_ctx->libusb_ctx, usb) != SR_OK)
return SR_ERR;
if ((ret = libusb_claim_interface(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 dev_close(struct sr_dev_inst *sdi)
{
struct sr_usb_dev_inst *usb;
if (!di->priv) {
sr_err("Driver was not initialized.");
return SR_ERR;
}
usb = sdi->conn;
if (!usb->devhdl)
/* Nothing to do. */
return SR_OK;
libusb_release_interface(usb->devhdl, LASCAR_INTERFACE);
libusb_close(usb->devhdl);
usb->devhdl = NULL;
sdi->status = SR_ST_INACTIVE;
return SR_OK;
}
static int cleanup(void)
{
int ret;
struct drv_context *drvc;
if (!(drvc = di->priv))
/* Can get called on an unused driver, doesn't matter. */
return SR_OK;
ret = dev_clear();
g_free(drvc);
di->priv = NULL;
return ret;
}
static int config_get(int id, GVariant **data, const struct sr_dev_inst *sdi,
const struct sr_probe_group *probe_group)
{
struct dev_context *devc;
struct sr_usb_dev_inst *usb;
int ret;
char str[128];
(void)probe_group;
devc = sdi->priv;
switch (id) {
case SR_CONF_CONN:
if (!sdi || !sdi->conn)
return SR_ERR_ARG;
usb = sdi->conn;
snprintf(str, 128, "%d.%d", usb->bus, usb->address);
*data = g_variant_new_string(str);
break;
case SR_CONF_DATALOG:
if (!sdi)
return SR_ERR_ARG;
if ((ret = lascar_is_logging(sdi)) == -1)
return SR_ERR;
*data = g_variant_new_boolean(ret ? TRUE : FALSE);
break;
case SR_CONF_LIMIT_SAMPLES:
*data = g_variant_new_uint64(devc->limit_samples);
break;
default:
return SR_ERR_NA;
}
return SR_OK;
}
static int config_set(int id, GVariant *data, const struct sr_dev_inst *sdi,
const struct sr_probe_group *probe_group)
{
struct dev_context *devc;
int ret;
(void)probe_group;
if (sdi->status != SR_ST_ACTIVE)
return SR_ERR_DEV_CLOSED;
if (!di->priv) {
sr_err("Driver was not initialized.");
return SR_ERR;
}
devc = sdi->priv;
ret = SR_OK;
switch (id) {
case SR_CONF_DATALOG:
if (g_variant_get_boolean(data)) {
/* Start logging. */
ret = lascar_start_logging(sdi);
} else {
/* Stop logging. */
ret = lascar_stop_logging(sdi);
}
break;
case SR_CONF_LIMIT_SAMPLES:
devc->limit_samples = g_variant_get_uint64(data);
sr_dbg("Setting sample limit to %" PRIu64 ".",
devc->limit_samples);
break;
default:
ret = SR_ERR_NA;
}
return ret;
}
static int config_list(int key, GVariant **data, const struct sr_dev_inst *sdi,
const struct sr_probe_group *probe_group)
{
(void)sdi;
(void)probe_group;
switch (key) {
case SR_CONF_SCAN_OPTIONS:
*data = g_variant_new_fixed_array(G_VARIANT_TYPE_INT32,
hwopts, ARRAY_SIZE(hwopts), sizeof(int32_t));
break;
case SR_CONF_DEVICE_OPTIONS:
*data = g_variant_new_fixed_array(G_VARIANT_TYPE_INT32,
hwcaps, ARRAY_SIZE(hwcaps), sizeof(int32_t));
break;
default:
return SR_ERR_NA;
}
return SR_OK;
}
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;
struct sr_usb_dev_inst *usb;
int dummy, ret;
devc = sdi->priv;
usb = sdi->conn;
if (lascar_get_config(usb->devhdl, devc->config, &dummy) != SR_OK)
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 dev_acquisition_start(const struct sr_dev_inst *sdi, void *cb_data)
{
struct sr_datafeed_packet packet;
struct sr_datafeed_meta meta;
struct sr_config *src;
struct dev_context *devc;
struct drv_context *drvc;
struct sr_usb_dev_inst *usb;
struct libusb_transfer *xfer_in, *xfer_out;
struct timeval tv;
uint64_t interval;
int ret;
unsigned char cmd[3], resp[4], *buf;
if (sdi->status != SR_ST_ACTIVE)
return SR_ERR_DEV_CLOSED;
if (!di->priv) {
sr_err("Driver was not initialized.");
return SR_ERR;
}
drvc = di->priv;
devc = sdi->priv;
usb = sdi->conn;
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. */
std_session_send_df_header(cb_data, LOG_PREFIX);
interval = (devc->config[0x1c] | (devc->config[0x1d] << 8)) * 1000;
packet.type = SR_DF_META;
packet.payload = &meta;
src = sr_config_new(SR_CONF_SAMPLE_INTERVAL, g_variant_new_uint64(interval));
meta.config = g_slist_append(NULL, src);
sr_session_send(devc->cb_data, &packet);
g_free(src);
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(usb->devhdl, LIBUSB_REQUEST_TYPE_VENDOR,
0x00, 0xffff, 0x00, NULL, 0, 50);
libusb_control_transfer(usb->devhdl, LIBUSB_REQUEST_TYPE_VENDOR,
0x02, 0x0002, 0x00, NULL, 0, 50);
libusb_control_transfer(usb->devhdl, LIBUSB_REQUEST_TYPE_VENDOR,
0x02, 0x0001, 0x00, NULL, 0, 50);
/* Flush input. The F321 requires this. */
while (libusb_bulk_transfer(usb->devhdl, LASCAR_EP_IN, resp,
256, &ret, 5) == 0 && ret > 0)
;
libusb_fill_bulk_transfer(xfer_in, 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, 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);
usb_source_add(drvc->sr_ctx, 100, lascar_el_usb_handle_events, (void *)sdi);
buf = g_try_malloc(4096);
libusb_fill_bulk_transfer(xfer_in, 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 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 = init,
.cleanup = cleanup,
.scan = scan,
.dev_list = dev_list,
.dev_clear = dev_clear,
.config_get = config_get,
.config_set = config_set,
.config_list = config_list,
.dev_open = dev_open,
.dev_close = dev_close,
.dev_acquisition_start = dev_acquisition_start,
.dev_acquisition_stop = dev_acquisition_stop,
.priv = NULL,
};