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ath9k: add spectral scan feature

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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@hrz.tu-chemnitz.de>
Signed-off-by: Mathias Kretschmer <mathias.kretschmer@fokus.fraunhofer.de>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Simon Wunderlich
2013-01-08 14:48:58 +01:00
committed by John W. Linville
parent 1a26cda8e0
commit e93d083f42
10 changed files with 653 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

115
drivers/net/wireless/ath/ath9k/debug.c
View File

@@ -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);