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/*
* Wi-Spy Gen1 USB interface
*
* Original USB device, polled via HID FEATURE requests. 84 samples, 1MHz
* resolution.
*
* Userspace driver uses libusb
*
* Includes HORRIBLE hack for Linux to attempt to disconnect a device when
* kernel includes in linux/usbdevice_fs.h are mismatched to current kernel
* support.
*
* This code 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 2 of the License, or
* (at your option) any later version.
*
* This code 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.
*
* Extra thanks to Ryan Woodings @ Metageek for interface documentation
*/
#include "config.h"
#include <stdio.h>
#include <stdint.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/time.h>
#include <signal.h>
#include <sys/socket.h>
#include <sys/wait.h>
#include <pthread.h>
#include <string.h>
#ifdef SYS_LINUX
/* Needed for our own tools */
#include <unistd.h>
#include <sys/stat.h>
#include <sys/ioctl.h>
/* Kluge around kernel internal/external header breakage */
#ifndef __user
#define __user
#endif
#include <linux/usbdevice_fs.h>
#include <errno.h>
/*
* Miserable hack to fix some distros which bundle a modern kernel but didn't
* update their linux/usbdevice_fs.h files. We define the ioctl locally, in
* theory the worst that could happen is that the kernel rejects it anyhow.
*/
#ifndef USBDEVFS_DISCONNECT
#warning "Kernel headers dont define USB disconnect support, trying to fake it"
#define USBDEVFS_DISCONNECT _IO('U', 22)
#endif
#endif /* linux hack */
/* LibUSB stuff */
#include <usb.h>
/* USB HID functions from specs which aren't defined for us */
#define HID_GET_REPORT 0x01
#define HID_RT_FEATURE 0x03
#define TIMEOUT 3000
/* Wispy1a had a bad vid/pid pair in the flash */
#define METAGEEK_WISPY1A_VID 0x04b4
#define METAGEEK_WISPY1A_PID 0x0bad
/* Wispy1b has it's own vid/pid */
#define METAGEEK_WISPY1B_VID 0x1781
#define METAGEEK_WISPY1B_PID 0x083e
/* Various settings */
#define WISPY1_USB_NUM_SAMPLES 83
#define WISPY1_USB_OFFSET_MDBM -97000
#define WISPY1_USB_RES_MDBM 1500
#define WISPY1_USB_RSSI_MAX 35
#define WISPY1_USB_RSSI_CALIBRATE_THRESH 4
/* calibration in RSSI, one dB approx 2 RSSI */
#define WISPY1_USB_CALIBRATE_MAX 1
#define WISPY1_USB_CALIBRATE_SWEEPS 10
#include "spectool_container.h"
#include "wispy_hw_gen1.h"
/* Aux tracking struct for wispy1 characteristics */
typedef struct _wispy1_usb_aux {
struct usb_device *dev;
struct usb_dev_handle *devhdl;
time_t last_read;
/* have we pushed a configure event from sweeps */
int configured;
/* IPC tracking records to the forked process for capturing data */
pthread_t usb_thread;
int usb_thread_alive;
/* Has the sweep data buffer been initialized? (ie, did we get a sample at 0) */
int sweepbuf_initialized;
/* how many sweeps has this device done over the run time? Nice to know, and
* we can use it for calibration counters too */
int num_sweeps;
/* Sweep buffer we maintain and return */
spectool_sample_sweep *sweepbuf;
/* Calibration modes. We avoid a "want calibration" by setting it to true */
int calibrated;
/* Calibration offset */
int calibration_mod;
/* Only allocated during calibration */
int8_t *calibrationbuf;
int sockpair[2];
spectool_phy *phydev;
} wispy1_usb_aux;
#ifdef SYS_LINUX
/* Libusb doesn't seem to always provide this, so we'll use our own, taken from the
* usb_detach_kernel_driver_np...
*
* THIS IS A HORRIBLE EVIL HACK THAT SHOULDN'T BE DONE, EVER
*
*/
struct local_usb_ioctl {
int ifno;
int ioctl_code;
void *data;
};
struct ghetto_libusb_devhandle {
int fd;
/* Nooo... so bad. */
};
int wispy_usb_detach_hack(struct usb_dev_handle *dev, int interface, char *errstr) {
struct local_usb_ioctl command;
struct ghetto_libusb_devhandle *gdev;
command.ifno = interface;
command.ioctl_code = USBDEVFS_DISCONNECT;
command.data = NULL;
gdev = (struct ghetto_libusb_devhandle *) dev;
if (ioctl(gdev->fd, USBDEVFS_IOCTL, &command) < 0) {
if (errno == EINVAL) {
snprintf(errstr, SPECTOOL_ERROR_MAX, "Your kernel doesn't appear to accept "
"the USB disconnect command. Either your kernel is too old and "
"does not support device removal, or support for removal has "
"been changed by your distribution kernel maintainers.");
}
snprintf(errstr, SPECTOOL_ERROR_MAX, "Could not detach kernel driver from "
"interface %d: %s", interface, strerror(errno));
return -1;
}
return 0;
}
#endif /* sys_linux */
/* Prototypes */
int wispy1_usb_open(spectool_phy *);
int wispy1_usb_close(spectool_phy *);
int wispy1_usb_poll(spectool_phy *);
int wispy1_usb_getpollfd(spectool_phy *);
void wispy1_usb_setcalibration(spectool_phy *, int);
spectool_sample_sweep *wispy1_usb_getsweep(spectool_phy *);
uint32_t wispy1_adler_checksum(const char *buf1, int len) {
int i;
uint32_t s1, s2;
char *buf = (char *)buf1;
int CHAR_OFFSET = 0;
s1 = s2 = 0;
for (i = 0; i < (len-4); i+=4) {
s2 += 4*(s1 + buf[i]) + 3*buf[i+1] + 2*buf[i+2] + buf[i+3] +
10*CHAR_OFFSET;
s1 += (buf[i+0] + buf[i+1] + buf[i+2] + buf[i+3] + 4*CHAR_OFFSET);
}
for (; i < len; i++) {
s1 += (buf[i]+CHAR_OFFSET); s2 += s1;
}
return (s1 & 0xffff) + (s2 << 16);
}
/* Scan for devices */
int wispy1_usb_device_scan(spectool_device_list *list) {
struct usb_bus *bus;
struct usb_device *dev;
int num_found = 0;
wispy1_usb_pair *auxpair;
char combopath[128];
/* Libusb init */
usb_init();
usb_find_busses();
usb_find_devices();
for (bus = usb_busses; bus; bus = bus->next) {
for (dev = bus->devices; dev; dev = dev->next) {
if (((dev->descriptor.idVendor == METAGEEK_WISPY1A_VID) &&
(dev->descriptor.idProduct == METAGEEK_WISPY1A_PID)) ||
((dev->descriptor.idVendor == METAGEEK_WISPY1B_VID) &&
(dev->descriptor.idProduct == METAGEEK_WISPY1B_PID))) {
/* If we're full up, break */
if (list->num_devs == list->max_devs - 1)
break;
auxpair = (wispy1_usb_pair *) malloc(sizeof(wispy1_usb_pair));
snprintf(auxpair->bus, 64, "%s", bus->dirname);
snprintf(auxpair->dev, 64, "%s", dev->filename);
snprintf(combopath, 128, "%s%s", auxpair->bus, auxpair->dev);
/* Fill in the list elements */
list->list[list->num_devs].device_id =
wispy1_adler_checksum(combopath, 128);
snprintf(list->list[list->num_devs].name, SPECTOOL_PHY_NAME_MAX,
"Wi-Spy v1 USB %u", list->list[list->num_devs].device_id);
list->list[list->num_devs].init_func = wispy1_usb_init;
list->list[list->num_devs].hw_rec = auxpair;
list->list[list->num_devs].num_sweep_ranges = 1;
list->list[list->num_devs].supported_ranges =
(spectool_sample_sweep *) malloc(SPECTOOL_SWEEP_SIZE(0));
/* 2400 to 2484 MHz at 1MHz res */
list->list[list->num_devs].supported_ranges[0].name =
strdup("2.4GHz ISM");
list->list[list->num_devs].supported_ranges[0].start_khz = 2400000;
list->list[list->num_devs].supported_ranges[0].end_khz = 2484000;
list->list[list->num_devs].supported_ranges[0].res_hz = 1000 * 1000;
list->list[list->num_devs].supported_ranges[0].num_samples =
WISPY1_USB_NUM_SAMPLES;
list->list[list->num_devs].supported_ranges[0].amp_offset_mdbm =
WISPY1_USB_OFFSET_MDBM;
list->list[list->num_devs].supported_ranges[0].amp_res_mdbm =
WISPY1_USB_RES_MDBM;
list->list[list->num_devs].supported_ranges[0].rssi_max =
WISPY1_USB_RSSI_MAX;
list->num_devs++;
num_found++;
}
}
}
return num_found;
}
int wispy1_usb_init(spectool_phy *phydev, spectool_device_rec *rec) {
wispy1_usb_pair *auxpair = (wispy1_usb_pair *) rec->hw_rec;
if (auxpair == NULL)
return -1;
return wispy1_usb_init_path(phydev, auxpair->bus, auxpair->dev);
}
/* Initialize a specific USB device based on bus and device IDs passed by the UI */
int wispy1_usb_init_path(spectool_phy *phydev, char *buspath, char *devpath) {
struct usb_bus *bus = NULL;
struct usb_device *dev = NULL;
struct usb_device *usb_dev_chosen = NULL;
char combopath[128];
uint32_t cid;
wispy1_usb_aux *auxptr = NULL;
usb_init();
usb_find_busses();
usb_find_devices();
snprintf(combopath, 128, "%s%s", buspath, devpath);
cid = wispy24x_adler_checksum(combopath, 128);
/* Don't know if a smarter way offhand, and we don't do this often, so just
* crawl and compare */
for (bus = usb_busses; bus; bus = bus->next) {
if (strcmp(bus->dirname, buspath))
continue;
for (dev = bus->devices; dev; dev = dev->next) {
if (strcmp(dev->filename, devpath))
continue;
if (((dev->descriptor.idVendor == METAGEEK_WISPY1A_VID) &&
(dev->descriptor.idProduct == METAGEEK_WISPY1A_PID)) ||
((dev->descriptor.idVendor == METAGEEK_WISPY1B_VID) &&
(dev->descriptor.idProduct == METAGEEK_WISPY1B_PID))) {
usb_dev_chosen = dev;
break;
} else {
snprintf(phydev->errstr, SPECTOOL_ERROR_MAX,
"WISPY1_INIT failed, specified device %u does not "
"appear to be a Wi-Spy device", cid);
return -1;
}
}
}
if (usb_dev_chosen == NULL) {
snprintf(phydev->errstr, SPECTOOL_ERROR_MAX,
"WISPY1_INIT failed, specified device %u does not appear "
"to exist.", cid);
return -1;
}
/* Build the device record with one sweep capability */
phydev->device_spec = (spectool_dev_spec *) malloc(sizeof(spectool_dev_spec));
phydev->device_spec->device_id = cid;
/* Default the name to the buspath */
snprintf(phydev->device_spec->device_name, SPECTOOL_PHY_NAME_MAX,
"Wi-Spy v1 USB %u", cid);
/* State */
phydev->state = SPECTOOL_STATE_CLOSED;
phydev->min_rssi_seen = -1;
phydev->device_spec->device_version = 0x01;
phydev->device_spec->num_sweep_ranges = 1;
phydev->device_spec->supported_ranges =
(spectool_sample_sweep *) malloc(SPECTOOL_SWEEP_SIZE(0));
/* 2400 to 2484 MHz at 1MHz res */
phydev->device_spec->supported_ranges[0].start_khz = 2400000;
phydev->device_spec->supported_ranges[0].end_khz = 2484000;
phydev->device_spec->supported_ranges[0].res_hz = 1000 * 1000;
phydev->device_spec->supported_ranges[0].num_samples = WISPY1_USB_NUM_SAMPLES;
phydev->device_spec->supported_ranges[0].amp_offset_mdbm = WISPY1_USB_OFFSET_MDBM;
phydev->device_spec->supported_ranges[0].amp_res_mdbm = WISPY1_USB_RES_MDBM;
phydev->device_spec->supported_ranges[0].rssi_max = WISPY1_USB_RSSI_MAX;
/* Copy it into our default range data */
phydev->device_spec->default_range = &(phydev->device_spec->supported_ranges[0]);
phydev->device_spec->cur_profile = 0;
/* Set up the aux state */
auxptr = malloc(sizeof(wispy1_usb_aux));
phydev->auxptr = auxptr;
auxptr->configured = 0;
auxptr->dev = dev;
auxptr->devhdl = NULL;
auxptr->phydev = phydev;
auxptr->sockpair[0] = -1;
auxptr->sockpair[1] = -1;
auxptr->sweepbuf_initialized = 0;
auxptr->sweepbuf =
(spectool_sample_sweep *) malloc(SPECTOOL_SWEEP_SIZE(WISPY1_USB_NUM_SAMPLES));
auxptr->sweepbuf->start_khz = 2400000;
auxptr->sweepbuf->end_khz = 2484000;
auxptr->sweepbuf->res_hz = 1000 * 1000;
auxptr->sweepbuf->num_samples = WISPY1_USB_NUM_SAMPLES;
auxptr->sweepbuf->amp_offset_mdbm = WISPY1_USB_OFFSET_MDBM;
auxptr->sweepbuf->amp_res_mdbm = WISPY1_USB_RES_MDBM;
auxptr->sweepbuf->rssi_max = WISPY1_USB_RSSI_MAX;
auxptr->sweepbuf->phydev = phydev;
/* init to -1 since the first pass at slot 0 increments */
auxptr->num_sweeps = -1;
/* Default to no calibration */
auxptr->calibrated = 1;
auxptr->calibration_mod = 0;
auxptr->calibrationbuf = NULL;
phydev->open_func = &wispy1_usb_open;
phydev->close_func = &wispy1_usb_close;
phydev->poll_func = &wispy1_usb_poll;
phydev->pollfd_func = &wispy1_usb_getpollfd;
phydev->setcalib_func = &wispy1_usb_setcalibration;
phydev->getsweep_func = &wispy1_usb_getsweep;
phydev->setposition_func = NULL;
phydev->draw_agg_suggestion = 5;
return 0;
}
void *wispy1_usb_servicethread(void *aux) {
wispy1_usb_aux *auxptr = (wispy1_usb_aux *) aux;
int sock;
struct usb_device *dev;
struct usb_dev_handle *wispy;
char buf[8];
struct timeval tm;
int x = 0, error = 0;
fd_set wset;
sigset_t signal_set;
error = 0;
sock = auxptr->sockpair[1];
dev = auxptr->dev;
wispy = auxptr->devhdl;
/* We don't want to see any signals in the child thread */
sigfillset(&signal_set);
pthread_sigmask(SIG_BLOCK, &signal_set, NULL);
while (1) {
/* wait until we're able to write out to the IPC socket, go into a blocking
* select */
FD_ZERO(&wset);
FD_SET(sock, &wset);
if (select(sock + 1, NULL, &wset, NULL, NULL) < 0) {
snprintf(auxptr->phydev->errstr, SPECTOOL_ERROR_MAX,
"wispy1_usb poller failed on IPC write select(): %s",
strerror(errno));
auxptr->usb_thread_alive = 0;
auxptr->phydev->state = SPECTOOL_STATE_ERROR;
pthread_exit(NULL);
}
if (auxptr->usb_thread_alive == 0) {
auxptr->phydev->state = SPECTOOL_STATE_ERROR;
pthread_exit(NULL);
}
if (FD_ISSET(sock, &wset) == 0)
continue;
/* Get new data only if we haven't requeued */
if (error == 0) {
buf[0] = (char) 0xFF;
/* grab a HID control */
if (usb_control_msg(wispy,
USB_ENDPOINT_IN + USB_TYPE_CLASS + USB_RECIP_INTERFACE,
HID_GET_REPORT, (HID_RT_FEATURE << 8),
0, buf, 8, TIMEOUT) == 0) {
snprintf(auxptr->phydev->errstr, SPECTOOL_ERROR_MAX,
"wispy1_usb poller failed on usb_control_msg "
"HID cmd: %s", strerror(errno));
auxptr->usb_thread_alive = 0;
auxptr->phydev->state = SPECTOOL_STATE_ERROR;
pthread_exit(NULL);
}
if (buf[0] == (char) 0xFF) {
snprintf(auxptr->phydev->errstr, SPECTOOL_ERROR_MAX,
"wispy1_usb poller failed on usb_control_msg "
"HID cmd, no data returned, was the device removed?");
auxptr->usb_thread_alive = 0;
send(sock, buf, 8, 0);
auxptr->phydev->state = SPECTOOL_STATE_ERROR;
pthread_exit(NULL);
}
}
/* Send it to the IPC remote, re-queue on enobufs */
if (send(sock, buf, 8, 0) < 0) {
if (errno == ENOBUFS) {
error = 1;
continue;
}
snprintf(auxptr->phydev->errstr, SPECTOOL_ERROR_MAX,
"wispy1_usb poller failed on IPC send: %s",
strerror(errno));
auxptr->usb_thread_alive = 0;
auxptr->phydev->state = SPECTOOL_STATE_ERROR;
pthread_exit(NULL);
}
/* Flush and use select as a usleep to wait before reading from USB again */
error = 0;
tm.tv_sec = 0;
tm.tv_usec = 7100;
select(0, NULL, NULL, NULL, &tm);
}
auxptr->usb_thread_alive = 0;
send(sock, buf, 8, 0);
auxptr->phydev->state = SPECTOOL_STATE_ERROR;
pthread_exit(NULL);
}
int wispy1_usb_getpollfd(spectool_phy *phydev) {
wispy1_usb_aux *auxptr = (wispy1_usb_aux *) phydev->auxptr;
if (auxptr->usb_thread_alive == 0) {
wispy1_usb_close(phydev);
return -1;
}
return auxptr->sockpair[0];
}
int wispy1_usb_open(spectool_phy *phydev) {
int pid_status;
wispy1_usb_aux *auxptr = (wispy1_usb_aux *) phydev->auxptr;
/* Make the client/server socketpair */
if (socketpair(PF_UNIX, SOCK_DGRAM, 0, auxptr->sockpair) < 0) {
snprintf(phydev->errstr, SPECTOOL_ERROR_MAX,
"wispy1_usb open failed to create socket pair for capture "
"process: %s", strerror(errno));
return -1;
}
if ((auxptr->devhdl = usb_open(auxptr->dev)) == NULL) {
snprintf(phydev->errstr, SPECTOOL_ERROR_MAX,
"wispy1_usb capture process failed to open USB device: %s",
strerror(errno));
return -1;
}
#ifndef SYS_DARWIN
/* Claim the device on non-OSX systems */
if (usb_claim_interface(auxptr->devhdl, 0) < 0) {
snprintf(phydev->errstr, SPECTOOL_ERROR_MAX,
"could not claim interface: %s", usb_strerror());
#ifdef LIBUSB_HAS_DETACH_KERNEL_DRIVER_NP
if (usb_detach_kernel_driver_np(auxptr->devhdl, 0) < 0) {
fprintf(stderr, "Could not detach kernel driver %s\n", usb_strerror());
snprintf(phydev->errstr, SPECTOOL_ERROR_MAX,
"Could not detach device from kernel driver: %s",
usb_strerror());
#endif
#ifdef SYS_LINUX
if (wispy24x_usb_detach_hack(auxptr->devhdl, 0, phydev->errstr) < 0) {
return -1;
}
usb_set_configuration(auxptr->devhdl, auxptr->dev->config->bConfigurationValue);
if (usb_claim_interface(auxptr->devhdl, 0) < 0) {
snprintf(phydev->errstr, SPECTOOL_ERROR_MAX,
"wispy24x_usb capture process detached device but still "
"can't claim interface: %s", strerror(errno));
return -1;
}
#else
return -1;
#endif
#ifdef LIBUSB_HAS_DETACH_KERNEL_DRIVER_NP
}
#endif
}
#endif
auxptr->usb_thread_alive = 1;
auxptr->last_read = time(0);
if (pthread_create(&(auxptr->usb_thread), NULL,
wispy1_usb_servicethread, auxptr) < 0) {
snprintf(phydev->errstr, SPECTOOL_ERROR_MAX,
"wispy1_usb capture failed to create thread: %s",
strerror(errno));
auxptr->usb_thread_alive = 0;
return -1;
}
/* Update the state */
phydev->state = SPECTOOL_STATE_CONFIGURING;
return 1;
}
int wispy1_usb_close(spectool_phy *phydev) {
wispy1_usb_aux *aux;
if (phydev == NULL)
return 0;
aux = (wispy1_usb_aux *) phydev->auxptr;
if (aux == NULL)
return 0;
if (aux->usb_thread_alive) {
aux->usb_thread_alive = 0;
pthread_join(aux->usb_thread, NULL);
}
if (aux->devhdl) {
usb_close(aux->devhdl);
aux->devhdl = NULL;
}
if (aux->sockpair[0] >= 0) {
close(aux->sockpair[0]);
aux->sockpair[0] = -1;
}
if (aux->sockpair[1] >= 0) {
close(aux->sockpair[1]);
aux->sockpair[1] = -1;
}
return 1;
}
spectool_sample_sweep *wispy1_usb_getsweep(spectool_phy *phydev) {
wispy1_usb_aux *auxptr = (wispy1_usb_aux *) phydev->auxptr;
return auxptr->sweepbuf;
}
void wispy1_usb_setcalibration(spectool_phy *phydev, int in_calib) {
wispy1_usb_aux *auxptr = (wispy1_usb_aux *) phydev->auxptr;
int x;
if (in_calib == 0 && auxptr->calibrationbuf != NULL) {
free(auxptr->calibrationbuf);
auxptr->calibrationbuf = NULL;
auxptr->calibrated = 1;
phydev->state = SPECTOOL_STATE_RUNNING;
}
if (in_calib != 0 && auxptr->calibrationbuf == NULL) {
auxptr->calibrationbuf =
(int8_t *) malloc(sizeof(int8_t) * WISPY1_USB_NUM_SAMPLES);
auxptr->calibrated = 0;
for (x = 0; x < WISPY1_USB_NUM_SAMPLES; x++)
auxptr->calibrationbuf[x] = 0;
phydev->state = SPECTOOL_STATE_CALIBRATING;
}
}
int wispy1_usb_poll(spectool_phy *phydev) {
wispy1_usb_aux *auxptr = (wispy1_usb_aux *) phydev->auxptr;
unsigned char lbuf[8];
int x, pos, calfreqs, ret;
long amptotal;
int adjusted_rssi;
/* Push a configure event before anything else */
if (auxptr->configured == 0) {
auxptr->configured = 1;
return SPECTOOL_POLL_CONFIGURED;
}
/* Use the error set by the polling thread */
if (auxptr->usb_thread_alive == 0) {
phydev->state = SPECTOOL_STATE_ERROR;
wispy1_usb_close(phydev);
return SPECTOOL_POLL_ERROR;
}
if ((ret = recv(auxptr->sockpair[0], lbuf, 8, 0)) < 0) {
if (auxptr->usb_thread_alive != 0)
snprintf(phydev->errstr, SPECTOOL_ERROR_MAX,
"wispy1_usb IPC receiver failed to read signal data: %s",
strerror(errno));
phydev->state = SPECTOOL_STATE_ERROR;
return SPECTOOL_POLL_ERROR;
}
if (time(0) - auxptr->last_read > 3) {
snprintf(phydev->errstr, SPECTOOL_ERROR_MAX,
"wispy1_usb didn't see any data for more than 3 seconds, "
"something has gone wrong (was the device removed?)");
phydev->state = SPECTOOL_STATE_ERROR;
return SPECTOOL_POLL_ERROR;
}
if (ret > 0)
auxptr->last_read = time(0);
/* Initialize the sweep buffer when we get to it
* If we haven't gotten around to a 0 state to initialize the buffer, we throw
* out the sample data until we do. */
if (lbuf[0] == 0) {
auxptr->sweepbuf_initialized = 1;
auxptr->num_sweeps++;
/* Init the timestamp for sweep begin */
gettimeofday(&(auxptr->sweepbuf->tm_start), NULL);
/* Catch the beginning of the sample loop and handle calibration if we've
* gathered enough data */
if (auxptr->calibrated == 0 &&
auxptr->num_sweeps >= WISPY1_USB_CALIBRATE_SWEEPS) {
amptotal = 0;
calfreqs = 0;
/* Average all the signals below the calibration threshold to get a
* level of fuzz to remove. */
for (x = 0; x < WISPY1_USB_NUM_SAMPLES; x++) {
if (auxptr->calibrationbuf[x] < WISPY1_USB_RSSI_CALIBRATE_THRESH) {
amptotal += auxptr->calibrationbuf[x];
calfreqs++;
}
}
if (calfreqs != 0) {
auxptr->calibration_mod =
(float) (((float) amptotal / (float) calfreqs) /
(float) WISPY1_USB_CALIBRATE_SWEEPS);
}
if (auxptr->calibration_mod > WISPY1_USB_CALIBRATE_MAX)
auxptr->calibration_mod = WISPY1_USB_CALIBRATE_MAX;
/* We're calibrated, destroy the buffer and flag us */
auxptr->calibrated = 1;
free(auxptr->calibrationbuf);
auxptr->calibrationbuf = NULL;
phydev->state = SPECTOOL_STATE_RUNNING;
}
} else if (auxptr->sweepbuf_initialized == 0) {
return SPECTOOL_POLL_NONE;
}
for (x = 0; x < 7; x++) {
/* Adjust the RSSI by the calibration */
if (lbuf[x+1] > auxptr->calibration_mod)
adjusted_rssi = lbuf[x+1] - auxptr->calibration_mod;
else
adjusted_rssi = lbuf[x+1];
pos = lbuf[0] + x;
if (pos >= WISPY1_USB_NUM_SAMPLES) {
continue;
}
/* Assume the buffer exists, and write into the calibration record if it's a
* maximum */
if (auxptr->calibrated == 0 && auxptr->calibrationbuf != NULL) {
if (adjusted_rssi > auxptr->calibrationbuf[pos])
auxptr->calibrationbuf[pos] = adjusted_rssi;
} else {
/* write it into the main buffer */
auxptr->sweepbuf->sample_data[pos] = adjusted_rssi;
}
if (phydev->min_rssi_seen > adjusted_rssi)
phydev->min_rssi_seen = adjusted_rssi;
}
/* Flag that a sweep is complete */
if (lbuf[0] + 7 >= WISPY1_USB_NUM_SAMPLES &&
auxptr->calibrated) {
gettimeofday(&(auxptr->sweepbuf->tm_end), NULL);
auxptr->sweepbuf->min_rssi_seen = phydev->min_rssi_seen;
return SPECTOOL_POLL_SWEEPCOMPLETE;
}
return SPECTOOL_POLL_NONE;
}
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