static int dev_acquisition_stop(struct sr_dev_inst *sdi, void *cb_data)
{
struct dev_context *devc;
(void)cb_data;
if (sdi->status != SR_ST_ACTIVE)
return SR_ERR_DEV_CLOSED;
/* Signal USB transfer handler to clean up and stop. */
sdi->status = SR_ST_STOPPING;
devc = sdi->priv;
if (devc->data_source == DATA_SOURCE_MEMORY && devc->config_dirty) {
/* The protocol doesn't have a command to clear stored data;
* it clears it whenever new configuration is set. That means
* we can't just configure the device any time we want when
* it's in DATA_SOURCE_MEMORY mode. The only safe time to do
* it is now, when we're sure we've pulled in all the stored
* data. */
kecheng_kc_330b_configure(sdi);
}
return SR_OK;
}
static int dev_close(struct sr_dev_inst *sdi)
{
struct dev_context *devc;
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;
/* This allows a frontend to configure the device without ever
* doing an acquisition step. */
devc = sdi->priv;
if (!devc->config_dirty)
kecheng_kc_330b_configure(sdi);
libusb_release_interface(usb->devhdl, USB_INTERFACE);
libusb_close(usb->devhdl);
usb->devhdl = NULL;
sdi->status = SR_ST_INACTIVE;
return SR_OK;
}
static int dev_acquisition_start(const struct sr_dev_inst *sdi)
{
struct sr_dev_driver *di = sdi->driver;
struct drv_context *drvc;
struct dev_context *devc;
struct sr_datafeed_packet packet;
struct sr_datafeed_meta meta;
struct sr_config *src;
struct sr_usb_dev_inst *usb;
GVariant *gvar, *rational[2];
const uint64_t *si;
int req_len, buf_len, len, ret;
unsigned char buf[9];
if (sdi->status != SR_ST_ACTIVE)
return SR_ERR_DEV_CLOSED;
drvc = di->context;
devc = sdi->priv;
usb = sdi->conn;
devc->num_samples = 0;
std_session_send_df_header(sdi);
if (devc->data_source == DATA_SOURCE_LIVE) {
/* Force configuration. */
kecheng_kc_330b_configure(sdi);
if (kecheng_kc_330b_status_get(sdi, &ret) != SR_OK)
return SR_ERR;
if (ret != DEVICE_ACTIVE) {
sr_err("Device is inactive");
/* Still continue though, since the device will
* just return 30.0 until the user hits the button
* on the device -- and then start feeding good
* samples back. */
}
} else {
if (kecheng_kc_330b_log_info_get(sdi, buf) != SR_OK)
return SR_ERR;
devc->mqflags = buf[4] ? SR_MQFLAG_SPL_TIME_WEIGHT_S : SR_MQFLAG_SPL_TIME_WEIGHT_F;
devc->mqflags |= buf[5] ? SR_MQFLAG_SPL_FREQ_WEIGHT_C : SR_MQFLAG_SPL_FREQ_WEIGHT_A;
devc->stored_samples = (buf[7] << 8) | buf[8];
if (devc->stored_samples == 0) {
/* Notify frontend of empty log by sending start/end packets. */
std_session_send_df_end(sdi);
return SR_OK;
}
if (devc->limit_samples && devc->limit_samples < devc->stored_samples)
devc->stored_samples = devc->limit_samples;
si = kecheng_kc_330b_sample_intervals[buf[1]];
rational[0] = g_variant_new_uint64(si[0]);
rational[1] = g_variant_new_uint64(si[1]);
gvar = g_variant_new_tuple(rational, 2);
src = sr_config_new(SR_CONF_SAMPLE_INTERVAL, gvar);
packet.type = SR_DF_META;
packet.payload = &meta;
meta.config = g_slist_append(NULL, src);
sr_session_send(sdi, &packet);
g_free(src);
}
if (!(devc->xfer = libusb_alloc_transfer(0)))
return SR_ERR;
usb_source_add(sdi->session, drvc->sr_ctx, 10,
kecheng_kc_330b_handle_events, (void *)sdi);
if (devc->data_source == DATA_SOURCE_LIVE) {
buf[0] = CMD_GET_LIVE_SPL;
buf_len = 1;
devc->state = LIVE_SPL_WAIT;
devc->last_live_request = g_get_monotonic_time() / 1000;
req_len = 3;
} else {
buf[0] = CMD_GET_LOG_DATA;
buf[1] = 0;
buf[2] = 0;
buf_len = 4;
devc->state = LOG_DATA_WAIT;
if (devc->stored_samples < 63)
buf[3] = devc->stored_samples;
else
buf[3] = 63;
/* Command ack byte + 2 bytes per sample. */
req_len = 1 + buf[3] * 2;
}
ret = libusb_bulk_transfer(usb->devhdl, EP_OUT, buf, buf_len, &len, 5);
if (ret != 0 || len != 1) {
sr_dbg("Failed to start acquisition: %s", libusb_error_name(ret));
libusb_free_transfer(devc->xfer);
return SR_ERR;
}
libusb_fill_bulk_transfer(devc->xfer, usb->devhdl, EP_IN, devc->buf,
req_len, kecheng_kc_330b_receive_transfer, (void *)sdi, 15);
if (libusb_submit_transfer(devc->xfer) != 0) {
libusb_free_transfer(devc->xfer);
return SR_ERR;
}
return SR_OK;
}