/*
* Copyright (c) 2013 Qualcomm Atheros, Inc.
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <linux/relay.h>
#include "ath9k.h"
static s8 fix_rssi_inv_only(u8 rssi_val)
{
if (rssi_val == 128)
rssi_val = 0;
return (s8) rssi_val;
}
static void ath_debug_send_fft_sample(struct ath_spec_scan_priv *spec_priv,
struct fft_sample_tlv *fft_sample_tlv)
{
int length;
if (!spec_priv->rfs_chan_spec_scan)
return;
length = __be16_to_cpu(fft_sample_tlv->length) +
sizeof(*fft_sample_tlv);
relay_write(spec_priv->rfs_chan_spec_scan, fft_sample_tlv, length);
}
/* returns 1 if this was a spectral frame, even if not handled. */
int ath_cmn_process_fft(struct ath_spec_scan_priv *spec_priv, struct ieee80211_hdr *hdr,
struct ath_rx_status *rs, u64 tsf)
{
struct ath_hw *ah = spec_priv->ah;
struct ath_common *common = ath9k_hw_common(spec_priv->ah);
u8 num_bins, *bins, *vdata = (u8 *)hdr;
struct fft_sample_ht20 fft_sample_20;
struct fft_sample_ht20_40 fft_sample_40;
struct fft_sample_tlv *tlv;
struct ath_radar_info *radar_info;
int len = rs->rs_datalen;
int dc_pos;
u16 fft_len, length, freq = ah->curchan->chan->center_freq;
enum nl80211_channel_type chan_type;
/* AR9280 and before report via ATH9K_PHYERR_RADAR, AR93xx and newer
* via ATH9K_PHYERR_SPECTRAL. Haven't seen ATH9K_PHYERR_FALSE_RADAR_EXT
* yet, but this is supposed to be possible as well.
*/
if (rs->rs_phyerr != ATH9K_PHYERR_RADAR &&
rs->rs_phyerr != ATH9K_PHYERR_FALSE_RADAR_EXT &&
rs->rs_phyerr != ATH9K_PHYERR_SPECTRAL)
return 0;
/* check if spectral scan bit is set. This does not have to be checked
* if received through a SPECTRAL phy error, but shouldn't hurt.
*/
radar_info = ((struct ath_radar_info *)&vdata[len]) - 1;
if (!(radar_info->pulse_bw_info & SPECTRAL_SCAN_BITMASK))
return 0;
chan_type = cfg80211_get_chandef_type(&common->hw->conf.chandef);
if ((chan_type == NL80211_CHAN_HT40MINUS) ||
(chan_type == NL80211_CHAN_HT40PLUS)) {
fft_len = SPECTRAL_HT20_40_TOTAL_DATA_LEN;
num_bins = SPECTRAL_HT20_40_NUM_BINS;
bins = (u8 *)fft_sample_40.data;
} else {
fft_len = SPECTRAL_HT20_TOTAL_DATA_LEN;
num_bins = SPECTRAL_HT20_NUM_BINS;
bins = (u8 *)fft_sample_20.data;
}
/* Variation in the data length is possible and will be fixed later */
if ((len > fft_len + 2) || (len < fft_len - 1))
return 1;
switch (len - fft_len) {
case 0:
/* length correct, nothing to do. */
memcpy(bins, vdata, num_bins);
break;
case -1:
/* first byte missing, duplicate it. */
memcpy(&bins[1], vdata, num_bins - 1);
bins[0] = vdata[0];
break;
case 2:
/* MAC added 2 extra bytes at bin 30 and 32, remove them. */
memcpy(bins, vdata, 30);
bins[30] = vdata[31];
memcpy(&bins[31], &vdata[33], num_bins - 31);
break;
case 1:
/* MAC added 2 extra bytes AND first byte is missing. */
bins[0] = vdata[0];
memcpy(&bins[1], vdata, 30);
bins[31] = vdata[31];
memcpy(&bins[32], &vdata[33], num_bins - 32);
break;
default:
return 1;
}
/* DC value (value in the middle) is the blind spot of the spectral
* sample and invalid, interpolate it.
*/
dc_pos = num_bins / 2;
bins[dc_pos] = (bins[dc_pos + 1] + bins[dc_pos - 1]) / 2;
if ((chan_type == NL80211_CHAN_HT40MINUS) ||
(chan_type == NL80211_CHAN_HT40PLUS)) {
s8 lower_rssi, upper_rssi;
s16 ext_nf;
u8 lower_max_index, upper_max_index;
u8 lower_bitmap_w, upper_bitmap_w;
u16 lower_mag, upper_mag;
struct ath9k_hw_cal_data *caldata = ah->caldata;
struct ath_ht20_40_mag_info *mag_info;
if (caldata)
ext_nf = ath9k_hw_getchan_noise(ah, ah->curchan,
caldata->nfCalHist[3].privNF);
else
ext_nf = ATH_DEFAULT_NOISE_FLOOR;
length = sizeof(fft_sample_40) - sizeof(struct fft_sample_tlv);
fft_sample_40.tlv.type = ATH_FFT_SAMPLE_HT20_40;
fft_sample_40.tlv.length = __cpu_to_be16(length);
fft_sample_40.freq = __cpu_to_be16(freq);
fft_sample_40.channel_type = chan_type;
if (chan_type == NL80211_CHAN_HT40PLUS) {
lower_rssi = fix_rssi_inv_only(rs->rs_rssi_ctl[0]);
upper_rssi = fix_rssi_inv_only(rs->rs_rssi_ext[0]);
fft_sample_40.lower_noise = ah->noise;
fft_sample_40.upper_noise = ext_nf;
} else {
lower_rssi = fix_rssi_inv_only(rs->rs_rssi_ext[0]);
upper_rssi = fix_rssi_inv_only(rs->rs_rssi_ctl[0]);
fft_sample_40.lower_noise = ext_nf;
fft_sample_40.upper_noise = ah->noise;
}
fft_sample_40.lower_rssi = lower_rssi;
fft_sample_40.upper_rssi = upper_rssi;
mag_info = ((struct ath_ht20_40_mag_info *)radar_info) - 1;
lower_mag = spectral_max_magnitude(mag_info->lower_bins);
upper_mag = spectral_max_magnitude(mag_info->upper_bins);
fft_sample_40.lower_max_magnitude = __cpu_to_be16(lower_mag);
fft_sample_40.upper_max_magnitude = __cpu_to_be16(upper_mag);
lower_max_index = spectral_max_index(mag_info->lower_bins);
upper_max_index = spectral_max_index(mag_info->upper_bins);
fft_sample_40.lower_max_index = lower_max_index;
fft_sample_40.upper_max_index = upper_max_index;
lower_bitmap_w = spectral_bitmap_weight(mag_info->lower_bins);
upper_bitmap_w = spectral_bitmap_weight(mag_info->upper_bins);
fft_sample_40.lower_bitmap_weight = lower_bitmap_w;
fft_sample_40.upper_bitmap_weight = upper_bitmap_w;
fft_sample_40.max_exp = mag_info->max_exp & 0xf;
fft_sample_40.tsf = __cpu_to_be64(tsf);
tlv = (struct fft_sample_tlv *)&fft_sample_40;
} else {
u8 max_index, bitmap_w;
u16 magnitude;
struct ath_ht20_mag_info *mag_info;
length = sizeof(fft_sample_20) - sizeof(struct fft_sample_tlv);
fft_sample_20.tlv.type = ATH_FFT_SAMPLE_HT20;
fft_sample_20.tlv.length = __cpu_to_be16(length);
fft_sample_20.freq = __cpu_to_be16(freq);
fft_sample_20.rssi = fix_rssi_inv_only(rs->rs_rssi_ctl[0]);
fft_sample_20.noise = ah->noise;
mag_info = ((struct ath_ht20_mag_info *)radar_info) - 1;
magnitude = spectral_max_magnitude(mag_info->all_bins);
fft_sample_20.max_magnitude = __cpu_to_be16(magnitude);
max_index = spectral_max_index(mag_info->all_bins);
fft_sample_20.max_index = max_index;
bitmap_w = spectral_bitmap_weight(mag_info->all_bins);
fft_sample_20.bitmap_weight = bitmap_w;
fft_sample_20.max_exp = mag_info->max_exp & 0xf;
fft_sample_20.tsf = __cpu_to_be64(tsf);
tlv = (struct fft_sample_tlv *)&fft_sample_20;
}
ath_debug_send_fft_sample(spec_priv, tlv);
return 1;
}
EXPORT_SYMBOL(ath_cmn_process_fft);
/*********************/
/* spectral_scan_ctl */
/*********************/
static ssize_t read_file_spec_scan_ctl(struct file *file, char __user *user_buf,
size_t count, loff_t *ppos)
{
struct ath_spec_scan_priv *spec_priv = file->private_data;
char *mode = "";
unsigned int len;
switch (spec_priv->spectral_mode) {
case SPECTRAL_DISABLED:
mode = "disable";
break;
case SPECTRAL_BACKGROUND:
mode = "background";
break;
case SPECTRAL_CHANSCAN:
mode = "chanscan";
break;
case SPECTRAL_MANUAL:
mode = "manual";
break;
}
len = strlen(mode);
return simple_read_from_buffer(user_buf, count, ppos, mode, len);
}
void ath9k_cmn_spectral_scan_trigger(struct ath_common *common,
struct ath_spec_scan_priv *spec_priv)
{
struct ath_hw *ah = spec_priv->ah;
u32 rxfilter;
if (config_enabled(CONFIG_ATH9K_TX99))
return;
if (!ath9k_hw_ops(ah)->spectral_scan_trigger) {
ath_err(common, "spectrum analyzer not implemented on this hardware\n");
return;
}
ath_ps_ops(common)->wakeup(common);
rxfilter = ath9k_hw_getrxfilter(ah);
ath9k_hw_setrxfilter(ah, rxfilter |
ATH9K_RX_FILTER_PHYRADAR |
ATH9K_RX_FILTER_PHYERR);
/* TODO: usually this should not be neccesary, but for some reason
* (or in some mode?) the trigger must be called after the
* configuration, otherwise the register will have its values reset
* (on my ar9220 to value 0x01002310)
*/
ath9k_cmn_spectral_scan_config(common, spec_priv, spec_priv->spectral_mode);
ath9k_hw_ops(ah)->spectral_scan_trigger(ah);
ath_ps_ops(common)->restore(common);
}
EXPORT_SYMBOL(ath9k_cmn_spectral_scan_trigger);
int ath9k_cmn_spectral_scan_config(struct ath_common *common,
struct ath_spec_scan_priv *spec_priv,
enum spectral_mode spectral_mode)
{
struct ath_hw *ah = spec_priv->ah;
if (!ath9k_hw_ops(ah)->spectral_scan_trigger) {
ath_err(common, "spectrum analyzer not implemented on this hardware\n");
return -1;
}
switch (spectral_mode) {
case SPECTRAL_DISABLED:
spec_priv->spec_config.enabled = 0;
break;
case SPECTRAL_BACKGROUND:
/* send endless samples.
* TODO: is this really useful for "background"?
*/
spec_priv->spec_config.endless = 1;
spec_priv->spec_config.enabled = 1;
break;
case SPECTRAL_CHANSCAN:
case SPECTRAL_MANUAL:
spec_priv->spec_config.endless = 0;
spec_priv->spec_config.enabled = 1;
break;
default:
return -1;
}
ath_ps_ops(common)->wakeup(common);
ath9k_hw_ops(ah)->spectral_scan_config(ah, &spec_priv->spec_config);
ath_ps_ops(common)->restore(common);
spec_priv->spectral_mode = spectral_mode;
return 0;
}
EXPORT_SYMBOL(ath9k_cmn_spectral_scan_config);
static ssize_t write_file_spec_scan_ctl(struct file *file,
const char __user *user_buf,
size_t count, loff_t *ppos)
{
struct ath_spec_scan_priv *spec_priv = file->private_data;
struct ath_common *common = ath9k_hw_common(spec_priv->ah);
char buf[32];
ssize_t len;
if (config_enabled(CONFIG_ATH9K_TX99))
return -EOPNOTSUPP;
len = min(count, sizeof(buf) - 1);
if (copy_from_user(buf, user_buf, len))
return -EFAULT;
buf[len] = '\0';
if (strncmp("trigger", buf, 7) == 0) {
ath9k_cmn_spectral_scan_trigger(common, spec_priv);
} else if (strncmp("background", buf, 10) == 0) {
ath9k_cmn_spectral_scan_config(common, spec_priv, SPECTRAL_BACKGROUND);
ath_dbg(common, CONFIG, "spectral scan: background mode enabled\n");
} else if (strncmp("chanscan", buf, 8) == 0) {
ath9k_cmn_spectral_scan_config(common, spec_priv, SPECTRAL_CHANSCAN);
ath_dbg(common, CONFIG, "spectral scan: channel scan mode enabled\n");
} else if (strncmp("manual", buf, 6) == 0) {
ath9k_cmn_spectral_scan_config(common, spec_priv, SPECTRAL_MANUAL);
ath_dbg(common, CONFIG, "spectral scan: manual mode enabled\n");
} else if (strncmp("disable", buf, 7) == 0) {
ath9k_cmn_spectral_scan_config(common, spec_priv, SPECTRAL_DISABLED);
ath_dbg(common, CONFIG, "spectral scan: disabled\n");
} else {
return -EINVAL;
}
return count;
}
static const struct file_operations fops_spec_scan_ctl = {
.read = read_file_spec_scan_ctl,
.write = write_file_spec_scan_ctl,
.open = simple_open,
.owner = THIS_MODULE,
.llseek = default_llseek,
};
/*************************/
/* spectral_short_repeat */
/*************************/
static ssize_t read_file_spectral_short_repeat(struct file *file,
char __user *user_buf,
size_t count, loff_t *ppos)
{
struct ath_spec_scan_priv *spec_priv = file->private_data;
char buf[32];
unsigned int len;
len = sprintf(buf, "%d\n", spec_priv->spec_config.short_repeat);
return simple_read_from_buffer(user_buf, count, ppos, buf, len);
}
static ssize_t write_file_spectral_short_repeat(struct file *file,
const char __user *user_buf,
size_t count, loff_t *ppos)
{
struct ath_spec_scan_priv *spec_priv = file->private_data;
unsigned long val;
char buf[32];
ssize_t len;
len = min(count, sizeof(buf) - 1);
if (copy_from_user(buf, user_buf, len))
return -EFAULT;
buf[len] = '\0';
if (kstrtoul(buf, 0, &val))
return -EINVAL;
if (val > 1)
return -EINVAL;
spec_priv->spec_config.short_repeat = val;
return count;
}
static const struct file_operations fops_spectral_short_repeat = {
.read = read_file_spectral_short_repeat,
.write = write_file_spectral_short_repeat,
.open = simple_open,
.owner = THIS_MODULE,
.llseek = default_llseek,
};
/******************/
/* spectral_count */
/******************/
static ssize_t read_file_spectral_count(struct file *file,
char __user *user_buf,
size_t count, loff_t *ppos)
{
struct ath_spec_scan_priv *spec_priv = file->private_data;
char buf[32];
unsigned int len;
len = sprintf(buf, "%d\n", spec_priv->spec_config.count);
return simple_read_from_buffer(user_buf, count, ppos, buf, len);
}
static ssize_t write_file_spectral_count(struct file *file,
const char __user *user_buf,
size_t count, loff_t *ppos)
{
struct ath_spec_scan_priv *spec_priv = file->private_data;
unsigned long val;
char buf[32];
ssize_t len;
len = min(count, sizeof(buf) - 1);
if (copy_from_user(buf, user_buf, len))
return -EFAULT;
buf[len] = '\0';
if (kstrtoul(buf, 0, &val))
return -EINVAL;
if (val > 255)
return -EINVAL;
spec_priv->spec_config.count = val;
return count;
}
static const struct file_operations fops_spectral_count = {
.read = read_file_spectral_count,
.write = write_file_spectral_count,
.open = simple_open,
.owner = THIS_MODULE,
.llseek = default_llseek,
};
/*******************/
/* spectral_period */
/*******************/
static ssize_t read_file_spectral_period(struct file *file,
char __user *user_buf,
size_t count, loff_t *ppos)
{
struct ath_spec_scan_priv *spec_priv = file->private_data;
char buf[32];
unsigned int len;
len = sprintf(buf, "%d\n", spec_priv->spec_config.period);
return simple_read_from_buffer(user_buf, count, ppos, buf, len);
}
static ssize_t write_file_spectral_period(struct file *file,
const char __user *user_buf,
size_t count, loff_t *ppos)
{
struct ath_spec_scan_priv *spec_priv = file->private_data;
unsigned long val;
char buf[32];
ssize_t len;
len = min(count, sizeof(buf) - 1);
if (copy_from_user(buf, user_buf, len))
return -EFAULT;
buf[len] = '\0';
if (kstrtoul(buf, 0, &val))
return -EINVAL;
if (val > 255)
return -EINVAL;
spec_priv->spec_config.period = val;
return count;
}
static const struct file_operations fops_spectral_period = {
.read = read_file_spectral_period,
.write = write_file_spectral_period,
.open = simple_open,
.owner = THIS_MODULE,
.llseek = default_llseek,
};
/***********************/
/* spectral_fft_period */
/***********************/
static ssize_t read_file_spectral_fft_period(struct file *file,
char __user *user_buf,
size_t count, loff_t *ppos)
{
struct ath_spec_scan_priv *spec_priv = file->private_data;
char buf[32];
unsigned int len;
len = sprintf(buf, "%d\n", spec_priv->spec_config.fft_period);
return simple_read_from_buffer(user_buf, count, ppos, buf, len);
}
static ssize_t write_file_spectral_fft_period(struct file *file,
const char __user *user_buf,
size_t count, loff_t *ppos)
{
struct ath_spec_scan_priv *spec_priv = file->private_data;
unsigned long val;
char buf[32];
ssize_t len;
len = min(count, sizeof(buf) - 1);
if (copy_from_user(buf, user_buf, len))
return -EFAULT;
buf[len] = '\0';
if (kstrtoul(buf, 0, &val))
return -EINVAL;
if (val > 15)
return -EINVAL;
spec_priv->spec_config.fft_period = val;
return count;
}
static const struct file_operations fops_spectral_fft_period = {
.read = read_file_spectral_fft_period,
.write = write_file_spectral_fft_period,
.open = simple_open,
.owner = THIS_MODULE,
.llseek = default_llseek,
};
/*******************/
/* Relay interface */
/*******************/
static struct dentry *create_buf_file_handler(const char *filename,
struct dentry *parent,
umode_t mode,
struct rchan_buf *buf,
int *is_global)
{
struct dentry *buf_file;
buf_file = debugfs_create_file(filename, mode, parent, buf,
&relay_file_operations);
*is_global = 1;
return buf_file;
}
static int remove_buf_file_handler(struct dentry *dentry)
{
debugfs_remove(dentry);
return 0;
}
static struct rchan_callbacks rfs_spec_scan_cb = {
.create_buf_file = create_buf_file_handler,
.remove_buf_file = remove_buf_file_handler,
};
/*********************/
/* Debug Init/Deinit */
/*********************/
void ath9k_cmn_spectral_deinit_debug(struct ath_spec_scan_priv *spec_priv)
{
if (config_enabled(CONFIG_ATH9K_DEBUGFS) && spec_priv->rfs_chan_spec_scan) {
relay_close(spec_priv->rfs_chan_spec_scan);
spec_priv->rfs_chan_spec_scan = NULL;
}
}
EXPORT_SYMBOL(ath9k_cmn_spectral_deinit_debug);
void ath9k_cmn_spectral_init_debug(struct ath_spec_scan_priv *spec_priv,
struct dentry *debugfs_phy)
{
spec_priv->rfs_chan_spec_scan = relay_open("spectral_scan",
debugfs_phy,
1024, 256, &rfs_spec_scan_cb,
NULL);
debugfs_create_file("spectral_scan_ctl",
S_IRUSR | S_IWUSR,
debugfs_phy, spec_priv,
&fops_spec_scan_ctl);
debugfs_create_file("spectral_short_repeat",
S_IRUSR | S_IWUSR,
debugfs_phy, spec_priv,
&fops_spectral_short_repeat);
debugfs_create_file("spectral_count",
S_IRUSR | S_IWUSR,
debugfs_phy, spec_priv,
&fops_spectral_count);
debugfs_create_file("spectral_period",
S_IRUSR | S_IWUSR,
debugfs_phy, spec_priv,
&fops_spectral_period);
debugfs_create_file("spectral_fft_period",
S_IRUSR | S_IWUSR,
debugfs_phy, spec_priv,
&fops_spectral_fft_period);
}
EXPORT_SYMBOL(ath9k_cmn_spectral_init_debug);
