ath9k: Cleanup spectral scan code

* Move definitions to spectral.h
* Move processing/debug code to spectral.c

Signed-off-by: Sujith Manoharan <c_manoha@qca.qualcomm.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

7 files changed, 761 insertions, 671 deletions

diff --git a/drivers/net/wireless/ath/ath9k/Makefile b/drivers/net/wireless/ath/ath9k/Makefile
index 337c459eda2..e9904e5ccd8 100644
--- a/drivers/net/wireless/ath/ath9k/Makefile
+++ b/drivers/net/wireless/ath/ath9k/Makefile
@@ -11,12 +11,14 @@ ath9k-$(CONFIG_ATH9K_BTCOEX_SUPPORT) += mci.o
 ath9k-$(CONFIG_ATH9K_LEGACY_RATE_CONTROL) += rc.o
 ath9k-$(CONFIG_ATH9K_PCI) += pci.o
 ath9k-$(CONFIG_ATH9K_AHB) += ahb.o
-ath9k-$(CONFIG_ATH9K_DEBUGFS) += debug.o
 ath9k-$(CONFIG_ATH9K_DFS_DEBUGFS) += dfs_debug.o
 ath9k-$(CONFIG_ATH9K_DFS_CERTIFIED) += dfs.o
 ath9k-$(CONFIG_ATH9K_TX99) += tx99.o
 ath9k-$(CONFIG_ATH9K_WOW) += wow.o
 
+ath9k-$(CONFIG_ATH9K_DEBUGFS) += debug.o \
+				 spectral.o
+
 obj-$(CONFIG_ATH9K) += ath9k.o
 
 ath9k_hw-y:=	\
diff --git a/drivers/net/wireless/ath/ath9k/ath9k.h b/drivers/net/wireless/ath/ath9k/ath9k.h
index dbf2a97d4da..55bb87400b1 100644
--- a/drivers/net/wireless/ath/ath9k/ath9k.h
+++ b/drivers/net/wireless/ath/ath9k/ath9k.h
@@ -27,6 +27,7 @@
 #include "common.h"
 #include "mci.h"
 #include "dfs.h"
+#include "spectral.h"
 
 /*
  * Header for the ath9k.ko driver core *only* -- hw code nor any other driver
@@ -716,23 +717,6 @@ struct ath9k_vif_iter_data {
 	int nadhocs;   /* number of adhoc vifs */
 };
 
-/* enum spectral_mode:
- *
- * @SPECTRAL_DISABLED: spectral mode is disabled
- * @SPECTRAL_BACKGROUND: hardware sends samples when it is not busy with
- *	something else.
- * @SPECTRAL_MANUAL: spectral scan is enabled, triggering for samples
- *	is performed manually.
- * @SPECTRAL_CHANSCAN: Like manual, but also triggered when changing channels
- *	during a channel scan.
- */
-enum spectral_mode {
-	SPECTRAL_DISABLED = 0,
-	SPECTRAL_BACKGROUND,
-	SPECTRAL_MANUAL,
-	SPECTRAL_CHANSCAN,
-};
-
 struct ath_softc {
 	struct ieee80211_hw *hw;
 	struct device *dev;
@@ -822,162 +806,6 @@ struct ath_softc {
 #endif
 };
 
-#define SPECTRAL_SCAN_BITMASK		0x10
-/* Radar info packet format, used for DFS and spectral formats. */
-struct ath_radar_info {
-	u8 pulse_length_pri;
-	u8 pulse_length_ext;
-	u8 pulse_bw_info;
-} __packed;
-
-/* The HT20 spectral data has 4 bytes of additional information at it's end.
- *
- * [7:0]: all bins {max_magnitude[1:0], bitmap_weight[5:0]}
- * [7:0]: all bins  max_magnitude[9:2]
- * [7:0]: all bins {max_index[5:0], max_magnitude[11:10]}
- * [3:0]: max_exp (shift amount to size max bin to 8-bit unsigned)
- */
-struct ath_ht20_mag_info {
-	u8 all_bins[3];
-	u8 max_exp;
-} __packed;
-
-#define SPECTRAL_HT20_NUM_BINS		56
-
-/* WARNING: don't actually use this struct! MAC may vary the amount of
- * data by -1/+2. This struct is for reference only.
- */
-struct ath_ht20_fft_packet {
-	u8 data[SPECTRAL_HT20_NUM_BINS];
-	struct ath_ht20_mag_info mag_info;
-	struct ath_radar_info radar_info;
-} __packed;
-
-#define SPECTRAL_HT20_TOTAL_DATA_LEN	(sizeof(struct ath_ht20_fft_packet))
-
-/* Dynamic 20/40 mode:
- *
- * [7:0]: lower bins {max_magnitude[1:0], bitmap_weight[5:0]}
- * [7:0]: lower bins  max_magnitude[9:2]
- * [7:0]: lower bins {max_index[5:0], max_magnitude[11:10]}
- * [7:0]: upper bins {max_magnitude[1:0], bitmap_weight[5:0]}
- * [7:0]: upper bins  max_magnitude[9:2]
- * [7:0]: upper bins {max_index[5:0], max_magnitude[11:10]}
- * [3:0]: max_exp (shift amount to size max bin to 8-bit unsigned)
- */
-struct ath_ht20_40_mag_info {
-	u8 lower_bins[3];
-	u8 upper_bins[3];
-	u8 max_exp;
-} __packed;
-
-#define SPECTRAL_HT20_40_NUM_BINS		128
-
-/* WARNING: don't actually use this struct! MAC may vary the amount of
- * data. This struct is for reference only.
- */
-struct ath_ht20_40_fft_packet {
-	u8 data[SPECTRAL_HT20_40_NUM_BINS];
-	struct ath_ht20_40_mag_info mag_info;
-	struct ath_radar_info radar_info;
-} __packed;
-
-
-#define SPECTRAL_HT20_40_TOTAL_DATA_LEN	(sizeof(struct ath_ht20_40_fft_packet))
-
-/* grabs the max magnitude from the all/upper/lower bins */
-static inline u16 spectral_max_magnitude(u8 *bins)
-{
-	return (bins[0] & 0xc0) >> 6 |
-	       (bins[1] & 0xff) << 2 |
-	       (bins[2] & 0x03) << 10;
-}
-
-/* return the max magnitude from the all/upper/lower bins */
-static inline u8 spectral_max_index(u8 *bins)
-{
-	s8 m = (bins[2] & 0xfc) >> 2;
-
-	/* TODO: this still doesn't always report the right values ... */
-	if (m > 32)
-		m |= 0xe0;
-	else
-		m &= ~0xe0;
-
-	return m + 29;
-}
-
-/* return the bitmap weight from the all/upper/lower bins */
-static inline u8 spectral_bitmap_weight(u8 *bins)
-{
-	return bins[0] & 0x3f;
-}
-
-/* FFT sample format given to userspace via debugfs.
- *
- * Please keep the type/length at the front position and change
- * other fields after adding another sample type
- *
- * TODO: this might need rework when switching to nl80211-based
- * interface.
- */
-enum ath_fft_sample_type {
-	ATH_FFT_SAMPLE_HT20 = 1,
-	ATH_FFT_SAMPLE_HT20_40,
-};
-
-struct fft_sample_tlv {
-	u8 type;	/* see ath_fft_sample */
-	__be16 length;
-	/* type dependent data follows */
-} __packed;
-
-struct fft_sample_ht20 {
-	struct fft_sample_tlv tlv;
-
-	u8 max_exp;
-
-	__be16 freq;
-	s8 rssi;
-	s8 noise;
-
-	__be16 max_magnitude;
-	u8 max_index;
-	u8 bitmap_weight;
-
-	__be64 tsf;
-
-	u8 data[SPECTRAL_HT20_NUM_BINS];
-} __packed;
-
-struct fft_sample_ht20_40 {
-	struct fft_sample_tlv tlv;
-
-	u8 channel_type;
-	__be16 freq;
-
-	s8 lower_rssi;
-	s8 upper_rssi;
-
-	__be64 tsf;
-
-	s8 lower_noise;
-	s8 upper_noise;
-
-	__be16 lower_max_magnitude;
-	__be16 upper_max_magnitude;
-
-	u8 lower_max_index;
-	u8 upper_max_index;
-
-	u8 lower_bitmap_weight;
-	u8 upper_bitmap_weight;
-
-	u8 max_exp;
-
-	u8 data[SPECTRAL_HT20_40_NUM_BINS];
-} __packed;
-
 /********/
 /* TX99 */
 /********/
@@ -1022,11 +850,6 @@ void ath9k_deinit_device(struct ath_softc *sc);
 void ath9k_set_hw_capab(struct ath_softc *sc, struct ieee80211_hw *hw);
 void ath9k_reload_chainmask_settings(struct ath_softc *sc);
 
-void ath9k_spectral_scan_trigger(struct ieee80211_hw *hw);
-int ath9k_spectral_scan_config(struct ieee80211_hw *hw,
-			       enum spectral_mode spectral_mode);
-
-
 #ifdef CONFIG_ATH9K_PCI
 int ath_pci_init(void);
 void ath_pci_exit(void);
diff --git a/drivers/net/wireless/ath/ath9k/debug.c b/drivers/net/wireless/ath/ath9k/debug.c
index 2f7dccfdb72..4c6f8b107ed 100644
--- a/drivers/net/wireless/ath/ath9k/debug.c
+++ b/drivers/net/wireless/ath/ath9k/debug.c
@@ -17,7 +17,6 @@
 #include <linux/slab.h>
 #include <linux/vmalloc.h>
 #include <linux/export.h>
-#include <linux/relay.h>
 #include <asm/unaligned.h>
 
 #include "ath9k.h"
@@ -1016,293 +1015,6 @@ static const struct file_operations fops_recv = {
 	.llseek = default_llseek,
 };
 
-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(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_spectral_scan_trigger(sc->hw);
-	} else if (strncmp("background", buf, 9) == 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,
-};
-
-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 < 0 || 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,
-};
-
-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 < 0 || 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,
-};
-
-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 < 0 || 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,
-};
-
-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 < 0 || 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,
-};
-
-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;
-}
-
-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);
-}
-
-static struct rchan_callbacks rfs_spec_scan_cb = {
-	.create_buf_file = create_buf_file_handler,
-	.remove_buf_file = remove_buf_file_handler,
-};
-
-
 static ssize_t read_file_regidx(struct file *file, char __user *user_buf,
                                 size_t count, loff_t *ppos)
 {
@@ -1772,10 +1484,7 @@ void ath9k_get_et_stats(struct ieee80211_hw *hw,
 
 void ath9k_deinit_debug(struct ath_softc *sc)
 {
-	if (config_enabled(CONFIG_ATH9K_DEBUGFS) && sc->rfs_chan_spec_scan) {
-		relay_close(sc->rfs_chan_spec_scan);
-		sc->rfs_chan_spec_scan = NULL;
-	}
+	ath9k_spectral_deinit_debug(sc);
 }
 
 int ath9k_init_debug(struct ath_hw *ah)
@@ -1795,6 +1504,7 @@ int ath9k_init_debug(struct ath_hw *ah)
 
 	ath9k_dfs_init_debug(sc);
 	ath9k_tx99_init_debug(sc);
+	ath9k_spectral_init_debug(sc);
 
 	debugfs_create_file("dma", S_IRUSR, sc->debug.debugfs_phy, sc,
 			    &fops_dma);
@@ -1841,23 +1551,6 @@ int ath9k_init_debug(struct ath_hw *ah)
 			    &fops_base_eeprom);
 	debugfs_create_file("modal_eeprom", S_IRUSR, sc->debug.debugfs_phy, sc,
 			    &fops_modal_eeprom);
-	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);
 	debugfs_create_u32("gpio_mask", S_IRUSR | S_IWUSR,
 			   sc->debug.debugfs_phy, &sc->sc_ah->gpio_mask);
 	debugfs_create_u32("gpio_val", S_IRUSR | S_IWUSR,
diff --git a/drivers/net/wireless/ath/ath9k/debug.h b/drivers/net/wireless/ath/ath9k/debug.h
index d6e3fa4299a..4f596ddeb15 100644
--- a/drivers/net/wireless/ath/ath9k/debug.h
+++ b/drivers/net/wireless/ath/ath9k/debug.h
@@ -292,8 +292,6 @@ void ath9k_sta_add_debugfs(struct ieee80211_hw *hw,
 			   struct ieee80211_vif *vif,
 			   struct ieee80211_sta *sta,
 			   struct dentry *dir);
-void ath_debug_send_fft_sample(struct ath_softc *sc,
-			       struct fft_sample_tlv *fft_sample);
 void ath9k_debug_stat_ant(struct ath_softc *sc,
 			  struct ath_hw_antcomb_conf *div_ant_conf,
 			  int main_rssi_avg, int alt_rssi_avg);
diff --git a/drivers/net/wireless/ath/ath9k/recv.c b/drivers/net/wireless/ath/ath9k/recv.c
index 2410224b6de..3692b2a501a 100644
--- a/drivers/net/wireless/ath/ath9k/recv.c
+++ b/drivers/net/wireless/ath/ath9k/recv.c
@@ -15,7 +15,6 @@
  */
 
 #include <linux/dma-mapping.h>
-#include <linux/relay.h>
 #include "ath9k.h"
 #include "ar9003_mac.h"
 
@@ -975,186 +974,6 @@ static void ath9k_process_tsf(struct ath_rx_status *rs,
 		rxs->mactime += 0x100000000ULL;
 }
 
-#ifdef CONFIG_ATH9K_DEBUGFS
-static s8 fix_rssi_inv_only(u8 rssi_val)
-{
-	if (rssi_val == 128)
-		rssi_val = 0;
-	return (s8) rssi_val;
-}
-#endif
-
-/* returns 1 if this was a spectral frame, even if not handled. */
-static int ath_process_fft(struct ath_softc *sc, struct ieee80211_hdr *hdr,
-			   struct ath_rx_status *rs, u64 tsf)
-{
-#ifdef CONFIG_ATH9K_DEBUGFS
-	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;
-#else
-	return 0;
-#endif
-}
-
 static bool ath9k_is_mybeacon(struct ath_softc *sc, struct ieee80211_hdr *hdr)
 {
 	struct ath_hw *ah = sc->sc_ah;
diff --git a/drivers/net/wireless/ath/ath9k/spectral.c b/drivers/net/wireless/ath/ath9k/spectral.c
new file mode 100644
index 00000000000..11adb5eb51c
--- /dev/null
+++ b/drivers/net/wireless/ath/ath9k/spectral.c
@@ -0,0 +1,543 @@
+/*
+ * 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(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_spectral_scan_trigger(sc->hw);
+	} else if (strncmp("background", buf, 9) == 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 < 0 || 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 < 0 || 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 < 0 || 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 < 0 || 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,
+					      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;
+}
+
+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(CONFIG_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);
+}
diff --git a/drivers/net/wireless/ath/ath9k/spectral.h b/drivers/net/wireless/ath/ath9k/spectral.h
new file mode 100644
index 00000000000..ead63412ee1
--- /dev/null
+++ b/drivers/net/wireless/ath/ath9k/spectral.h
@@ -0,0 +1,212 @@
+/*
+ * 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.
+ */
+
+#ifndef SPECTRAL_H
+#define SPECTRAL_H
+
+/* enum spectral_mode:
+ *
+ * @SPECTRAL_DISABLED: spectral mode is disabled
+ * @SPECTRAL_BACKGROUND: hardware sends samples when it is not busy with
+ *	something else.
+ * @SPECTRAL_MANUAL: spectral scan is enabled, triggering for samples
+ *	is performed manually.
+ * @SPECTRAL_CHANSCAN: Like manual, but also triggered when changing channels
+ *	during a channel scan.
+ */
+enum spectral_mode {
+	SPECTRAL_DISABLED = 0,
+	SPECTRAL_BACKGROUND,
+	SPECTRAL_MANUAL,
+	SPECTRAL_CHANSCAN,
+};
+
+#define SPECTRAL_SCAN_BITMASK		0x10
+/* Radar info packet format, used for DFS and spectral formats. */
+struct ath_radar_info {
+	u8 pulse_length_pri;
+	u8 pulse_length_ext;
+	u8 pulse_bw_info;
+} __packed;
+
+/* The HT20 spectral data has 4 bytes of additional information at it's end.
+ *
+ * [7:0]: all bins {max_magnitude[1:0], bitmap_weight[5:0]}
+ * [7:0]: all bins  max_magnitude[9:2]
+ * [7:0]: all bins {max_index[5:0], max_magnitude[11:10]}
+ * [3:0]: max_exp (shift amount to size max bin to 8-bit unsigned)
+ */
+struct ath_ht20_mag_info {
+	u8 all_bins[3];
+	u8 max_exp;
+} __packed;
+
+#define SPECTRAL_HT20_NUM_BINS		56
+
+/* WARNING: don't actually use this struct! MAC may vary the amount of
+ * data by -1/+2. This struct is for reference only.
+ */
+struct ath_ht20_fft_packet {
+	u8 data[SPECTRAL_HT20_NUM_BINS];
+	struct ath_ht20_mag_info mag_info;
+	struct ath_radar_info radar_info;
+} __packed;
+
+#define SPECTRAL_HT20_TOTAL_DATA_LEN	(sizeof(struct ath_ht20_fft_packet))
+
+/* Dynamic 20/40 mode:
+ *
+ * [7:0]: lower bins {max_magnitude[1:0], bitmap_weight[5:0]}
+ * [7:0]: lower bins  max_magnitude[9:2]
+ * [7:0]: lower bins {max_index[5:0], max_magnitude[11:10]}
+ * [7:0]: upper bins {max_magnitude[1:0], bitmap_weight[5:0]}
+ * [7:0]: upper bins  max_magnitude[9:2]
+ * [7:0]: upper bins {max_index[5:0], max_magnitude[11:10]}
+ * [3:0]: max_exp (shift amount to size max bin to 8-bit unsigned)
+ */
+struct ath_ht20_40_mag_info {
+	u8 lower_bins[3];
+	u8 upper_bins[3];
+	u8 max_exp;
+} __packed;
+
+#define SPECTRAL_HT20_40_NUM_BINS		128
+
+/* WARNING: don't actually use this struct! MAC may vary the amount of
+ * data. This struct is for reference only.
+ */
+struct ath_ht20_40_fft_packet {
+	u8 data[SPECTRAL_HT20_40_NUM_BINS];
+	struct ath_ht20_40_mag_info mag_info;
+	struct ath_radar_info radar_info;
+} __packed;
+
+
+#define SPECTRAL_HT20_40_TOTAL_DATA_LEN	(sizeof(struct ath_ht20_40_fft_packet))
+
+/* grabs the max magnitude from the all/upper/lower bins */
+static inline u16 spectral_max_magnitude(u8 *bins)
+{
+	return (bins[0] & 0xc0) >> 6 |
+	       (bins[1] & 0xff) << 2 |
+	       (bins[2] & 0x03) << 10;
+}
+
+/* return the max magnitude from the all/upper/lower bins */
+static inline u8 spectral_max_index(u8 *bins)
+{
+	s8 m = (bins[2] & 0xfc) >> 2;
+
+	/* TODO: this still doesn't always report the right values ... */
+	if (m > 32)
+		m |= 0xe0;
+	else
+		m &= ~0xe0;
+
+	return m + 29;
+}
+
+/* return the bitmap weight from the all/upper/lower bins */
+static inline u8 spectral_bitmap_weight(u8 *bins)
+{
+	return bins[0] & 0x3f;
+}
+
+/* FFT sample format given to userspace via debugfs.
+ *
+ * Please keep the type/length at the front position and change
+ * other fields after adding another sample type
+ *
+ * TODO: this might need rework when switching to nl80211-based
+ * interface.
+ */
+enum ath_fft_sample_type {
+	ATH_FFT_SAMPLE_HT20 = 1,
+	ATH_FFT_SAMPLE_HT20_40,
+};
+
+struct fft_sample_tlv {
+	u8 type;	/* see ath_fft_sample */
+	__be16 length;
+	/* type dependent data follows */
+} __packed;
+
+struct fft_sample_ht20 {
+	struct fft_sample_tlv tlv;
+
+	u8 max_exp;
+
+	__be16 freq;
+	s8 rssi;
+	s8 noise;
+
+	__be16 max_magnitude;
+	u8 max_index;
+	u8 bitmap_weight;
+
+	__be64 tsf;
+
+	u8 data[SPECTRAL_HT20_NUM_BINS];
+} __packed;
+
+struct fft_sample_ht20_40 {
+	struct fft_sample_tlv tlv;
+
+	u8 channel_type;
+	__be16 freq;
+
+	s8 lower_rssi;
+	s8 upper_rssi;
+
+	__be64 tsf;
+
+	s8 lower_noise;
+	s8 upper_noise;
+
+	__be16 lower_max_magnitude;
+	__be16 upper_max_magnitude;
+
+	u8 lower_max_index;
+	u8 upper_max_index;
+
+	u8 lower_bitmap_weight;
+	u8 upper_bitmap_weight;
+
+	u8 max_exp;
+
+	u8 data[SPECTRAL_HT20_40_NUM_BINS];
+} __packed;
+
+void ath9k_spectral_init_debug(struct ath_softc *sc);
+void ath9k_spectral_deinit_debug(struct ath_softc *sc);
+
+void ath9k_spectral_scan_trigger(struct ieee80211_hw *hw);
+int ath9k_spectral_scan_config(struct ieee80211_hw *hw,
+			       enum spectral_mode spectral_mode);
+
+#ifdef CONFIG_ATH9K_DEBUGFS
+int ath_process_fft(struct ath_softc *sc, struct ieee80211_hdr *hdr,
+		    struct ath_rx_status *rs, u64 tsf);
+#else
+static inline int ath_process_fft(struct ath_softc *sc,
+				  struct ieee80211_hdr *hdr,
+				  struct ath_rx_status *rs, u64 tsf)
+{
+	return 0;
+}
+#endif /* CONFIG_ATH9K_DEBUGFS */
+
+#endif /* SPECTRAL_H */