drivers/net/wireless/ath/ath9k/spectral.c - vendor/opensource/backports - Git at Google

 /*
  * 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_softc *sc,
 				      struct fft_sample_tlv *fft_sample_tlv)
 {
 	int length;
 	if (!sc->rfs_chan_spec_scan)
 		return;

 	length = __be16_to_cpu(fft_sample_tlv->length) +
 		 sizeof(*fft_sample_tlv);
 	relay_write(sc->rfs_chan_spec_scan, fft_sample_tlv, length);
 }

 /* returns 1 if this was a spectral frame, even if not handled. */
 int ath_process_fft(struct ath_softc *sc, struct ieee80211_hdr *hdr,
 		    struct ath_rx_status *rs, u64 tsf)
 {
 	struct ath_hw *ah = sc->sc_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(&sc->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(sc, tlv);

 	return 1;
 }

 /*********************/
 /* 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_softc *sc = file->private_data;
 	char *mode = "";
 	unsigned int len;

 	switch (sc->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);
 }

 static ssize_t write_file_spec_scan_ctl(struct file *file,
 					const char __user *user_buf,
 					size_t count, loff_t *ppos)
 {
 	struct ath_softc *sc = file->private_data;
 	struct ath_common *common = ath9k_hw_common(sc->sc_ah);
 	char buf[32];
 	ssize_t len;

 	if (config_enabled(CPTCFG_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_spectral_scan_trigger(sc->hw);
 	} else if (strncmp("background", buf, 10) == 0) {
 		ath9k_spectral_scan_config(sc->hw, SPECTRAL_BACKGROUND);
 		ath_dbg(common, CONFIG, "spectral scan: background mode enabled\n");
 	} else if (strncmp("chanscan", buf, 8) == 0) {
 		ath9k_spectral_scan_config(sc->hw, SPECTRAL_CHANSCAN);
 		ath_dbg(common, CONFIG, "spectral scan: channel scan mode enabled\n");
 	} else if (strncmp("manual", buf, 6) == 0) {
 		ath9k_spectral_scan_config(sc->hw, SPECTRAL_MANUAL);
 		ath_dbg(common, CONFIG, "spectral scan: manual mode enabled\n");
 	} else if (strncmp("disable", buf, 7) == 0) {
 		ath9k_spectral_scan_config(sc->hw, 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_softc *sc = file->private_data;
 	char buf[32];
 	unsigned int len;

 	len = sprintf(buf, "%d\n", sc->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_softc *sc = 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;

 	sc->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_softc *sc = file->private_data;
 	char buf[32];
 	unsigned int len;

 	len = sprintf(buf, "%d\n", sc->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_softc *sc = 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;

 	sc->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_softc *sc = file->private_data;
 	char buf[32];
 	unsigned int len;

 	len = sprintf(buf, "%d\n", sc->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_softc *sc = 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;

 	sc->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_softc *sc = file->private_data;
 	char buf[32];
 	unsigned int len;

 	len = sprintf(buf, "%d\n", sc->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_softc *sc = 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;

 	sc->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,
 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,3,0))
 					      umode_t mode,
 #else
 					      int mode,
 #endif
 					      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_spectral_deinit_debug(struct ath_softc *sc)
 {
 	if (config_enabled(CPTCFG_ATH9K_DEBUGFS) && sc->rfs_chan_spec_scan) {
 		relay_close(sc->rfs_chan_spec_scan);
 		sc->rfs_chan_spec_scan = NULL;
 	}
 }

 void ath9k_spectral_init_debug(struct ath_softc *sc)
 {
 	sc->rfs_chan_spec_scan = relay_open("spectral_scan",
 					    sc->debug.debugfs_phy,
 					    1024, 256, &rfs_spec_scan_cb,
 					    NULL);
 	debugfs_create_file("spectral_scan_ctl",
 			    S_IRUSR | S_IWUSR,
 			    sc->debug.debugfs_phy, sc,
 			    &fops_spec_scan_ctl);
 	debugfs_create_file("spectral_short_repeat",
 			    S_IRUSR | S_IWUSR,
 			    sc->debug.debugfs_phy, sc,
 			    &fops_spectral_short_repeat);
 	debugfs_create_file("spectral_count",
 			    S_IRUSR | S_IWUSR,
 			    sc->debug.debugfs_phy, sc,
 			    &fops_spectral_count);
 	debugfs_create_file("spectral_period",
 			    S_IRUSR | S_IWUSR,
 			    sc->debug.debugfs_phy, sc,
 			    &fops_spectral_period);
 	debugfs_create_file("spectral_fft_period",
 			    S_IRUSR | S_IWUSR,
 			    sc->debug.debugfs_phy, sc,
 			    &fops_spectral_fft_period);
 }
	/*
	* 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_softc *sc,
	struct fft_sample_tlv *fft_sample_tlv)
	{
	int length;
	if (!sc->rfs_chan_spec_scan)
	return;

	length = __be16_to_cpu(fft_sample_tlv->length) +
	sizeof(*fft_sample_tlv);
	relay_write(sc->rfs_chan_spec_scan, fft_sample_tlv, length);
	}

	/* returns 1 if this was a spectral frame, even if not handled. */
	int ath_process_fft(struct ath_softc sc, struct ieee80211_hdr hdr,
	struct ath_rx_status *rs, u64 tsf)
	{
	struct ath_hw *ah = sc->sc_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(&sc->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(sc, tlv);

	return 1;
	}

	/*********************/
	/* 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_softc *sc = file->private_data;
	char *mode = "";
	unsigned int len;

	switch (sc->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);
	}

	static ssize_t write_file_spec_scan_ctl(struct file *file,
	const char __user *user_buf,
	size_t count, loff_t *ppos)
	{
	struct ath_softc *sc = file->private_data;
	struct ath_common *common = ath9k_hw_common(sc->sc_ah);
	char buf[32];
	ssize_t len;

	if (config_enabled(CPTCFG_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_spectral_scan_trigger(sc->hw);
	} else if (strncmp("background", buf, 10) == 0) {
	ath9k_spectral_scan_config(sc->hw, SPECTRAL_BACKGROUND);
	ath_dbg(common, CONFIG, "spectral scan: background mode enabled\n");
	} else if (strncmp("chanscan", buf, 8) == 0) {
	ath9k_spectral_scan_config(sc->hw, SPECTRAL_CHANSCAN);
	ath_dbg(common, CONFIG, "spectral scan: channel scan mode enabled\n");
	} else if (strncmp("manual", buf, 6) == 0) {
	ath9k_spectral_scan_config(sc->hw, SPECTRAL_MANUAL);
	ath_dbg(common, CONFIG, "spectral scan: manual mode enabled\n");
	} else if (strncmp("disable", buf, 7) == 0) {
	ath9k_spectral_scan_config(sc->hw, 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_softc *sc = file->private_data;
	char buf[32];
	unsigned int len;

	len = sprintf(buf, "%d\n", sc->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_softc *sc = 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;

	sc->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_softc *sc = file->private_data;
	char buf[32];
	unsigned int len;

	len = sprintf(buf, "%d\n", sc->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_softc *sc = 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;

	sc->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_softc *sc = file->private_data;
	char buf[32];
	unsigned int len;

	len = sprintf(buf, "%d\n", sc->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_softc *sc = 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;

	sc->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_softc *sc = file->private_data;
	char buf[32];
	unsigned int len;

	len = sprintf(buf, "%d\n", sc->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_softc *sc = 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;

	sc->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,
	#if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,3,0))
	umode_t mode,
	#else
	int mode,
	#endif
	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_spectral_deinit_debug(struct ath_softc *sc)
	{
	if (config_enabled(CPTCFG_ATH9K_DEBUGFS) && sc->rfs_chan_spec_scan) {
	relay_close(sc->rfs_chan_spec_scan);
	sc->rfs_chan_spec_scan = NULL;
	}
	}

	void ath9k_spectral_init_debug(struct ath_softc *sc)
	{
	sc->rfs_chan_spec_scan = relay_open("spectral_scan",
	sc->debug.debugfs_phy,
	1024, 256, &rfs_spec_scan_cb,
	NULL);
	debugfs_create_file("spectral_scan_ctl",
	S_IRUSR \| S_IWUSR,
	sc->debug.debugfs_phy, sc,
	&fops_spec_scan_ctl);
	debugfs_create_file("spectral_short_repeat",
	S_IRUSR \| S_IWUSR,
	sc->debug.debugfs_phy, sc,
	&fops_spectral_short_repeat);
	debugfs_create_file("spectral_count",
	S_IRUSR \| S_IWUSR,
	sc->debug.debugfs_phy, sc,
	&fops_spectral_count);
	debugfs_create_file("spectral_period",
	S_IRUSR \| S_IWUSR,
	sc->debug.debugfs_phy, sc,
	&fops_spectral_period);
	debugfs_create_file("spectral_fft_period",
	S_IRUSR \| S_IWUSR,
	sc->debug.debugfs_phy, sc,
	&fops_spectral_fft_period);
	}