Adds the spectral scan feature for ath9k. AR92xx and AR93xx chips are supported for now. The spectral scan is triggered by configuring a mode through a debugfs control file. Samples can be gathered via another relay debugfs file. Essentially, to try it out: echo chanscan > /sys/kernel/debug/ieee80211/phy0/ath9k/spectral_scan_ctl iw dev wlan0 scan cat /sys/kernel/debug/ieee80211/phy0/ath9k/spectral_scan0 > samples echo disable > /sys/kernel/debug/ieee80211/phy0/ath9k/spectral_scan_ctl This feature is still experimental. The special "chanscan" mode is used to perform spectral scan while mac80211 is scanning for channels. To allow this, sw_scan_start/complete() ops have been added. The patch contains code snippets and information from Zefir Kurtisi and information provided by Adrian Chadd and Felix Fietkau. Signed-off-by: Simon Wunderlich <siwu@xxxxxxxxxxxxxxxxxx> Signed-off-by: Mathias Kretschmer <mathias.kretschmer@xxxxxxxxxxxxxxxxxxx> --- Thanks a lot to Adrian, Felix, Zefir, and everyone else contributing to get this feature upstream. :) Sample program for viewing the data is updated and available here: https://github.com/simonwunderlich/FFT_eval/ Changes to RFCv2: * change to TLV/binary format for output * add a lot of information for data format and parameters * implement HT20 only (but add info for Dynamic 20/40 format) * interpret the data within the driver (apply offset, fix blind spot, fix data length variation, ...) before sending Changes to RFCv1: * remove nl80211/mac80211 stuff for now, to build a proper interface after intepretation/output stabilized * split spectral scan call into config, trigger and wait call, which * can be called as desired (or depending on the mode) * use relay(fs) to stream spectral scan results (thanks for the hint * Felix), this seems to be much cleaner - as long as we stay in debugfs --- drivers/net/wireless/ath/ath9k/ar9002_phy.c | 64 +++++++++++ drivers/net/wireless/ath/ath9k/ar9003_phy.c | 64 +++++++++++ drivers/net/wireless/ath/ath9k/ath9k.h | 152 +++++++++++++++++++++++++++ drivers/net/wireless/ath/ath9k/debug.c | 115 ++++++++++++++++++++ drivers/net/wireless/ath/ath9k/debug.h | 5 + drivers/net/wireless/ath/ath9k/hw.h | 39 +++++++ drivers/net/wireless/ath/ath9k/init.c | 7 ++ drivers/net/wireless/ath/ath9k/mac.h | 3 +- drivers/net/wireless/ath/ath9k/main.c | 100 ++++++++++++++++++ drivers/net/wireless/ath/ath9k/recv.c | 106 +++++++++++++++++++ 10 files changed, 654 insertions(+), 1 deletion(-) diff --git a/drivers/net/wireless/ath/ath9k/ar9002_phy.c b/drivers/net/wireless/ath/ath9k/ar9002_phy.c index 846dd79..6de5442 100644 --- a/drivers/net/wireless/ath/ath9k/ar9002_phy.c +++ b/drivers/net/wireless/ath/ath9k/ar9002_phy.c @@ -555,6 +555,67 @@ static void ar9002_hw_antdiv_comb_conf_set(struct ath_hw *ah, REG_WRITE(ah, AR_PHY_MULTICHAIN_GAIN_CTL, regval); } +void ar9002_hw_spectral_scan_config(struct ath_hw *ah, + struct ath_spec_scan *param) +{ + u8 count; + + if (!param->enabled) { + REG_CLR_BIT(ah, AR_PHY_SPECTRAL_SCAN, + AR_PHY_SPECTRAL_SCAN_ENABLE); + return; + } + REG_SET_BIT(ah, AR_PHY_RADAR_0, AR_PHY_RADAR_0_FFT_ENA); + REG_SET_BIT(ah, AR_PHY_SPECTRAL_SCAN, AR_PHY_SPECTRAL_SCAN_ENABLE); + + if (param->short_repeat) + REG_SET_BIT(ah, AR_PHY_SPECTRAL_SCAN, + AR_PHY_SPECTRAL_SCAN_SHORT_REPEAT); + else + REG_CLR_BIT(ah, AR_PHY_SPECTRAL_SCAN, + AR_PHY_SPECTRAL_SCAN_SHORT_REPEAT); + + /* on AR92xx, the highest bit of count will make the the chip send + * spectral samples endlessly. Check if this really was intended, + * and fix otherwise. + */ + count = param->count; + if (param->endless) + count = 0; + else if (count & 0x80) + count = 0x7f; + + REG_RMW_FIELD(ah, AR_PHY_SPECTRAL_SCAN, + AR_PHY_SPECTRAL_SCAN_COUNT, count); + REG_RMW_FIELD(ah, AR_PHY_SPECTRAL_SCAN, + AR_PHY_SPECTRAL_SCAN_PERIOD, param->period); + REG_RMW_FIELD(ah, AR_PHY_SPECTRAL_SCAN, + AR_PHY_SPECTRAL_SCAN_FFT_PERIOD, param->fft_period); + + return; +} + +static void ar9002_hw_spectral_scan_trigger(struct ath_hw *ah) +{ + REG_SET_BIT(ah, AR_PHY_SPECTRAL_SCAN, AR_PHY_SPECTRAL_SCAN_ENABLE); + /* Activate spectral scan */ + REG_SET_BIT(ah, AR_PHY_SPECTRAL_SCAN, + AR_PHY_SPECTRAL_SCAN_ACTIVE); +} + +static void ar9002_hw_spectral_scan_wait(struct ath_hw *ah) +{ + struct ath_common *common = ath9k_hw_common(ah); + + /* Poll for spectral scan complete */ + if (!ath9k_hw_wait(ah, AR_PHY_SPECTRAL_SCAN, + AR_PHY_SPECTRAL_SCAN_ACTIVE, + 0, AH_WAIT_TIMEOUT)) { + ath_err(common, "spectral scan wait failed\n"); + return; + } +} + void ar9002_hw_attach_phy_ops(struct ath_hw *ah) { struct ath_hw_private_ops *priv_ops = ath9k_hw_private_ops(ah); @@ -571,6 +632,9 @@ void ar9002_hw_attach_phy_ops(struct ath_hw *ah) ops->antdiv_comb_conf_get = ar9002_hw_antdiv_comb_conf_get; ops->antdiv_comb_conf_set = ar9002_hw_antdiv_comb_conf_set; + ops->spectral_scan_config = ar9002_hw_spectral_scan_config; + ops->spectral_scan_trigger = ar9002_hw_spectral_scan_trigger; + ops->spectral_scan_wait = ar9002_hw_spectral_scan_wait; ar9002_hw_set_nf_limits(ah); } diff --git a/drivers/net/wireless/ath/ath9k/ar9003_phy.c b/drivers/net/wireless/ath/ath9k/ar9003_phy.c index ce19c09..1b9156d 100644 --- a/drivers/net/wireless/ath/ath9k/ar9003_phy.c +++ b/drivers/net/wireless/ath/ath9k/ar9003_phy.c @@ -1450,6 +1450,67 @@ set_rfmode: return 0; } +static void ar9003_hw_spectral_scan_config(struct ath_hw *ah, + struct ath_spec_scan *param) +{ + u8 count; + + if (!param->enabled) { + REG_CLR_BIT(ah, AR_PHY_SPECTRAL_SCAN, + AR_PHY_SPECTRAL_SCAN_ENABLE); + return; + } + + REG_SET_BIT(ah, AR_PHY_RADAR_0, AR_PHY_RADAR_0_FFT_ENA); + REG_SET_BIT(ah, AR_PHY_SPECTRAL_SCAN, AR_PHY_SPECTRAL_SCAN_ENABLE); + + /* on AR93xx and newer, count = 0 will make the the chip send + * spectral samples endlessly. Check if this really was intended, + * and fix otherwise. + */ + count = param->count; + if (param->endless) + count = 0; + else if (param->count == 0) + count = 1; + + if (param->short_repeat) + REG_SET_BIT(ah, AR_PHY_SPECTRAL_SCAN, + AR_PHY_SPECTRAL_SCAN_SHORT_REPEAT); + else + REG_CLR_BIT(ah, AR_PHY_SPECTRAL_SCAN, + AR_PHY_SPECTRAL_SCAN_SHORT_REPEAT); + + REG_RMW_FIELD(ah, AR_PHY_SPECTRAL_SCAN, + AR_PHY_SPECTRAL_SCAN_COUNT, count); + REG_RMW_FIELD(ah, AR_PHY_SPECTRAL_SCAN, + AR_PHY_SPECTRAL_SCAN_PERIOD, param->period); + REG_RMW_FIELD(ah, AR_PHY_SPECTRAL_SCAN, + AR_PHY_SPECTRAL_SCAN_FFT_PERIOD, param->fft_period); + + return; +} + +static void ar9003_hw_spectral_scan_trigger(struct ath_hw *ah) +{ + /* Activate spectral scan */ + REG_SET_BIT(ah, AR_PHY_SPECTRAL_SCAN, + AR_PHY_SPECTRAL_SCAN_ACTIVE); + +} +static void ar9003_hw_spectral_scan_wait(struct ath_hw *ah) +{ + struct ath_common *common = ath9k_hw_common(ah); + + /* Poll for spectral scan complete */ + if (!ath9k_hw_wait(ah, AR_PHY_SPECTRAL_SCAN, + AR_PHY_SPECTRAL_SCAN_ACTIVE, + 0, AH_WAIT_TIMEOUT)) { + ath_err(common, "spectral scan wait failed\n"); + return; + } +} + void ar9003_hw_attach_phy_ops(struct ath_hw *ah) { struct ath_hw_private_ops *priv_ops = ath9k_hw_private_ops(ah); @@ -1483,6 +1544,9 @@ void ar9003_hw_attach_phy_ops(struct ath_hw *ah) ops->antdiv_comb_conf_get = ar9003_hw_antdiv_comb_conf_get; ops->antdiv_comb_conf_set = ar9003_hw_antdiv_comb_conf_set; ops->antctrl_shared_chain_lnadiv = ar9003_hw_antctrl_shared_chain_lnadiv; + ops->spectral_scan_config = ar9003_hw_spectral_scan_config; + ops->spectral_scan_trigger = ar9003_hw_spectral_scan_trigger; + ops->spectral_scan_wait = ar9003_hw_spectral_scan_wait; ar9003_hw_set_nf_limits(ah); ar9003_hw_set_radar_conf(ah); diff --git a/drivers/net/wireless/ath/ath9k/ath9k.h b/drivers/net/wireless/ath/ath9k/ath9k.h index 86e26a1..222622f 100644 --- a/drivers/net/wireless/ath/ath9k/ath9k.h +++ b/drivers/net/wireless/ath/ath9k/ath9k.h @@ -675,6 +675,23 @@ 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; @@ -743,6 +760,10 @@ struct ath_softc { u8 ant_tx, ant_rx; struct dfs_pattern_detector *dfs_detector; u32 wow_enabled; + /* relay(fs) channel for spectral scan */ + struct rchan *rfs_chan_spec_scan; + enum spectral_mode spectral_mode; + int scanning; #ifdef CONFIG_PM_SLEEP atomic_t wow_got_bmiss_intr; @@ -751,6 +772,133 @@ 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 = 0, +}; + +struct fft_sample_tlv { + u8 type; /* see ath_fft_sample */ + u16 length; + /* type dependent data follows */ +} __packed; + +struct fft_sample_ht20 { + struct fft_sample_tlv tlv; + + u8 __alignment; + + u16 freq; + s8 rssi; + s8 noise; + + u16 max_magnitude; + u8 max_index; + u8 bitmap_weight; + + u64 tsf; + + u16 data[SPECTRAL_HT20_NUM_BINS]; +} __packed; + void ath9k_tasklet(unsigned long data); int ath_cabq_update(struct ath_softc *); @@ -773,6 +921,10 @@ void ath9k_set_hw_capab(struct ath_softc *sc, struct ieee80211_hw *hw); void ath9k_reload_chainmask_settings(struct ath_softc *sc); bool ath9k_uses_beacons(int type); +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); diff --git a/drivers/net/wireless/ath/ath9k/debug.c b/drivers/net/wireless/ath/ath9k/debug.c index 13ff9ed..75b504b 100644 --- a/drivers/net/wireless/ath/ath9k/debug.c +++ b/drivers/net/wireless/ath/ath9k/debug.c @@ -17,6 +17,7 @@ #include <linux/slab.h> #include <linux/vmalloc.h> #include <linux/export.h> +#include <linux/relay.h> #include <asm/unaligned.h> #include "ath9k.h" @@ -966,6 +967,112 @@ 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; + + 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 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) +{ + if (!sc->rfs_chan_spec_scan) + return; + + relay_write(sc->rfs_chan_spec_scan, fft_sample_tlv, + fft_sample_tlv->length + sizeof(*fft_sample_tlv)); +} + +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) { @@ -1780,6 +1887,14 @@ 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, + 262144, 4, &rfs_spec_scan_cb, + NULL); + debugfs_create_file("spectral_scan_ctl", S_IRUSR | S_IWUSR, + sc->debug.debugfs_phy, sc, + &fops_spec_scan_ctl); + #ifdef CONFIG_ATH9K_MAC_DEBUG debugfs_create_file("samples", S_IRUSR, sc->debug.debugfs_phy, sc, &fops_samps); diff --git a/drivers/net/wireless/ath/ath9k/debug.h b/drivers/net/wireless/ath/ath9k/debug.h index 375c3b4..b19bed7 100644 --- a/drivers/net/wireless/ath/ath9k/debug.h +++ b/drivers/net/wireless/ath/ath9k/debug.h @@ -23,6 +23,7 @@ struct ath_txq; struct ath_buf; +struct fft_sample_tlv; #ifdef CONFIG_ATH9K_DEBUGFS #define TX_STAT_INC(q, c) sc->debug.stats.txstats[q].c++ @@ -323,6 +324,10 @@ void ath9k_sta_remove_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); + #else #define RX_STAT_INC(c) /* NOP */ diff --git a/drivers/net/wireless/ath/ath9k/hw.h b/drivers/net/wireless/ath/ath9k/hw.h index 7f1a8e9..dd7549a 100644 --- a/drivers/net/wireless/ath/ath9k/hw.h +++ b/drivers/net/wireless/ath/ath9k/hw.h @@ -661,6 +661,37 @@ struct ath_hw_private_ops { }; /** + * struct ath_spec_scan - parameters for Atheros spectral scan + * + * @enabled: enable/disable spectral scan + * @short_repeat: controls whether the chip is in spectral scan mode + * for 4 usec (enabled) or 204 usec (disabled) + * @count: number of scan results requested. There are special meanings + * in some chip revisions: + * AR92xx: highest bit set (>=128) for endless mode + * (spectral scan won't stopped until explicitly disabled) + * AR9300 and newer: 0 for endless mode + * @endless: true if endless mode is intended. Otherwise, count value is + * corrected to the next possible value. + * @period: time duration between successive spectral scan entry points + * (period*256*Tclk). Tclk = ath_common->clockrate + * @fft_period: PHY passes FFT frames to MAC every (fft_period+1)*4uS + * + * Note: Tclk = 40MHz or 44MHz depending upon operating mode. + * Typically it's 44MHz in 2/5GHz on later chips, but there's + * a "fast clock" check for this in 5GHz. + * + */ +struct ath_spec_scan { + bool enabled; + bool short_repeat; + bool endless; + u8 count; + u8 period; + u8 fft_period; +}; + +/** * struct ath_hw_ops - callbacks used by hardware code and driver code * * This structure contains callbacks designed to to be used internally by @@ -668,6 +699,10 @@ struct ath_hw_private_ops { * * @config_pci_powersave: * @calibrate: periodic calibration for NF, ANI, IQ, ADC gain, ADC-DC + * + * @spectral_scan_config: set parameters for spectral scan and enable/disable it + * @spectral_scan_trigger: trigger a spectral scan run + * @spectral_scan_wait: wait for a spectral scan run to finish */ struct ath_hw_ops { void (*config_pci_powersave)(struct ath_hw *ah, @@ -688,6 +723,10 @@ struct ath_hw_ops { void (*antdiv_comb_conf_set)(struct ath_hw *ah, struct ath_hw_antcomb_conf *antconf); void (*antctrl_shared_chain_lnadiv)(struct ath_hw *hw, bool enable); + void (*spectral_scan_config)(struct ath_hw *ah, + struct ath_spec_scan *param); + void (*spectral_scan_trigger)(struct ath_hw *ah); + void (*spectral_scan_wait)(struct ath_hw *ah); }; struct ath_nf_limits { diff --git a/drivers/net/wireless/ath/ath9k/init.c b/drivers/net/wireless/ath/ath9k/init.c index f69ef5d..29d5fae 100644 --- a/drivers/net/wireless/ath/ath9k/init.c +++ b/drivers/net/wireless/ath/ath9k/init.c @@ -20,6 +20,7 @@ #include <linux/slab.h> #include <linux/ath9k_platform.h> #include <linux/module.h> +#include <linux/relay.h> #include "ath9k.h" @@ -940,6 +941,12 @@ static void ath9k_deinit_softc(struct ath_softc *sc) sc->dfs_detector->exit(sc->dfs_detector); ath9k_eeprom_release(sc); + + if (sc->rfs_chan_spec_scan) { + relay_close(sc->rfs_chan_spec_scan); + sc->rfs_chan_spec_scan = NULL; + } + kfree(sc->sc_ah); sc->sc_ah = NULL; } diff --git a/drivers/net/wireless/ath/ath9k/mac.h b/drivers/net/wireless/ath/ath9k/mac.h index 4a745e6..1ff8170 100644 --- a/drivers/net/wireless/ath/ath9k/mac.h +++ b/drivers/net/wireless/ath/ath9k/mac.h @@ -226,7 +226,8 @@ enum ath9k_phyerr { ATH9K_PHYERR_HT_LENGTH_ILLEGAL = 35, ATH9K_PHYERR_HT_RATE_ILLEGAL = 36, - ATH9K_PHYERR_MAX = 37, + ATH9K_PHYERR_SPECTRAL = 38, + ATH9K_PHYERR_MAX = 39, }; struct ath_desc { diff --git a/drivers/net/wireless/ath/ath9k/main.c b/drivers/net/wireless/ath/ath9k/main.c index be30a9a..11533ad 100644 --- a/drivers/net/wireless/ath/ath9k/main.c +++ b/drivers/net/wireless/ath/ath9k/main.c @@ -1075,6 +1075,86 @@ static void ath9k_disable_ps(struct ath_softc *sc) ath_dbg(common, PS, "PowerSave disabled\n"); } +void ath9k_spectral_scan_trigger(struct ieee80211_hw *hw) +{ + struct ath_softc *sc = hw->priv; + struct ath_hw *ah = sc->sc_ah; + struct ath_common *common = ath9k_hw_common(ah); + u32 rxfilter; + + if (!ath9k_hw_ops(ah)->spectral_scan_trigger) { + ath_err(common, "spectrum analyzer not implemented on this hardware\n"); + return; + } + + ath9k_ps_wakeup(sc); + 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_spectral_scan_config(hw, sc->spectral_mode); + ath9k_hw_ops(ah)->spectral_scan_trigger(ah); + ath9k_ps_restore(sc); +} + +int ath9k_spectral_scan_config(struct ieee80211_hw *hw, + enum spectral_mode spectral_mode) +{ + struct ath_softc *sc = hw->priv; + struct ath_hw *ah = sc->sc_ah; + struct ath_common *common = ath9k_hw_common(ah); + struct ath_spec_scan param; + + if (!ath9k_hw_ops(ah)->spectral_scan_trigger) { + ath_err(common, "spectrum analyzer not implemented on this hardware\n"); + return -1; + } + + /* NOTE: this will generate a few samples ... + * + * TODO: review default parameters, and/or define an interface to set + * them. + */ + param.enabled = 1; + param.short_repeat = true; + param.count = 8; + param.endless = false; + param.period = 0xFF; + param.fft_period = 0xF; + + switch (spectral_mode) { + case SPECTRAL_DISABLED: + param.enabled = 0; + break; + case SPECTRAL_BACKGROUND: + /* send endless samples. + * TODO: is this really useful for "background"? + */ + param.endless = 1; + break; + case SPECTRAL_CHANSCAN: + break; + case SPECTRAL_MANUAL: + break; + default: + return -1; + } + + ath9k_ps_wakeup(sc); + ath9k_hw_ops(ah)->spectral_scan_config(ah, ¶m); + ath9k_ps_restore(sc); + + sc->spectral_mode = spectral_mode; + + return 0; +} + static int ath9k_config(struct ieee80211_hw *hw, u32 changed) { struct ath_softc *sc = hw->priv; @@ -1188,6 +1268,11 @@ static int ath9k_config(struct ieee80211_hw *hw, u32 changed) */ if (old_pos >= 0) ath_update_survey_nf(sc, old_pos); + + /* perform spectral scan if requested. */ + if (sc->scanning && sc->spectral_mode == SPECTRAL_CHANSCAN) + ath9k_spectral_scan_trigger(hw); + } if (changed & IEEE80211_CONF_CHANGE_POWER) { @@ -2238,6 +2323,19 @@ static void ath9k_set_wakeup(struct ieee80211_hw *hw, bool enabled) } #endif +static void ath9k_sw_scan_start(struct ieee80211_hw *hw) +{ + struct ath_softc *sc = hw->priv; + + sc->scanning = 1; +} + +static void ath9k_sw_scan_complete(struct ieee80211_hw *hw) +{ + struct ath_softc *sc = hw->priv; + + sc->scanning = 0; +} struct ieee80211_ops ath9k_ops = { .tx = ath9k_tx, @@ -2284,4 +2382,6 @@ struct ieee80211_ops ath9k_ops = { .sta_add_debugfs = ath9k_sta_add_debugfs, .sta_remove_debugfs = ath9k_sta_remove_debugfs, #endif + .sw_scan_start = ath9k_sw_scan_start, + .sw_scan_complete = ath9k_sw_scan_complete, }; diff --git a/drivers/net/wireless/ath/ath9k/recv.c b/drivers/net/wireless/ath/ath9k/recv.c index d4df98a..88017f1 100644 --- a/drivers/net/wireless/ath/ath9k/recv.c +++ b/drivers/net/wireless/ath/ath9k/recv.c @@ -15,6 +15,7 @@ */ #include <linux/dma-mapping.h> +#include <linux/relay.h> #include "ath9k.h" #include "ar9003_mac.h" @@ -1034,6 +1035,108 @@ static void ath9k_rx_skb_postprocess(struct ath_common *common, rxs->flag &= ~RX_FLAG_DECRYPTED; } +static s8 fix_rssi_inv_only(u8 rssi_val) +{ + if (rssi_val == 128) + rssi_val = 0; + return (s8) rssi_val; +} + + +static void ath_process_fft(struct ath_softc *sc, struct ieee80211_hdr *hdr, + struct ath_rx_status *rs, u64 tsf) +{ +#ifdef CONFIG_ATH_DEBUG + struct ath_hw *ah = sc->sc_ah; + u8 bins[SPECTRAL_HT20_NUM_BINS]; + u8 *vdata = (u8 *)hdr; + struct fft_sample_ht20 fft_sample; + struct ath_radar_info *radar_info; + struct ath_ht20_mag_info *mag_info; + int len = rs->rs_datalen; + int i, dc_pos; + + /* 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; + + /* Variation in the data length is possible and will be fixed later. + * Note that we only support HT20 for now. + * + * TODO: add HT20_40 support as well. + */ + if ((len > SPECTRAL_HT20_TOTAL_DATA_LEN + 2) || + (len < SPECTRAL_HT20_TOTAL_DATA_LEN - 1)) + return; + + /* 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; + + fft_sample.tlv.type = ATH_FFT_SAMPLE_HT20; + fft_sample.tlv.length = sizeof(fft_sample) - sizeof(fft_sample.tlv); + + fft_sample.freq = ah->curchan->chan->center_freq; + fft_sample.rssi = fix_rssi_inv_only(rs->rs_rssi_ctl0); + fft_sample.noise = ah->noise; + + switch (len - SPECTRAL_HT20_TOTAL_DATA_LEN) { + case 0: + /* length correct, nothing to do. */ + memcpy(bins, vdata, SPECTRAL_HT20_NUM_BINS); + break; + case -1: + /* first byte missing, duplicate it. */ + memcpy(&bins[1], vdata, SPECTRAL_HT20_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], SPECTRAL_HT20_NUM_BINS - 31); + break; + case 1: + /* MAC added 2 extra bytes AND first byte is missing. */ + bins[0] = vdata[0]; + memcpy(&bins[0], vdata, 30); + bins[31] = vdata[31]; + memcpy(&bins[32], &vdata[33], SPECTRAL_HT20_NUM_BINS - 32); + break; + default: + return; + } + + /* DC value (value in the middle) is the blind spot of the spectral + * sample and invalid, interpolate it. + */ + dc_pos = SPECTRAL_HT20_NUM_BINS / 2; + bins[dc_pos] = (bins[dc_pos + 1] + bins[dc_pos - 1]) / 2; + + /* mag data is at the end of the frame, in front of radar_info */ + mag_info = ((struct ath_ht20_mag_info *)radar_info) - 1; + + /* Apply exponent and grab further auxiliary information. */ + for (i = 0; i < SPECTRAL_HT20_NUM_BINS; i++) + fft_sample.data[i] = bins[i] << mag_info->max_exp; + + fft_sample.max_magnitude = spectral_max_magnitude(mag_info->all_bins); + fft_sample.max_index = spectral_max_index(mag_info->all_bins); + fft_sample.bitmap_weight = spectral_bitmap_weight(mag_info->all_bins); + fft_sample.tsf = tsf; + + ath_debug_send_fft_sample(sc, &fft_sample.tlv); +#endif +} + int ath_rx_tasklet(struct ath_softc *sc, int flush, bool hp) { struct ath_buf *bf; @@ -1131,6 +1234,9 @@ int ath_rx_tasklet(struct ath_softc *sc, int flush, bool hp) unlikely(tsf_lower - rs.rs_tstamp > 0x10000000)) rxs->mactime += 0x100000000ULL; + if ((rs.rs_status & ATH9K_RXERR_PHY)) + ath_process_fft(sc, hdr, &rs, rxs->mactime); + retval = ath9k_rx_skb_preprocess(common, hw, hdr, &rs, rxs, &decrypt_error); if (retval) -- 1.7.10.4 -- To unsubscribe from this list: send the line "unsubscribe linux-wireless" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
