net/mac80211/debugfs.c - arm/linux-arm-legacy - Git at Google


 /*
  * mac80211 debugfs for wireless PHYs
  *
  * Copyright 2007	Johannes Berg <johannes@sipsolutions.net>
  *
  * GPLv2
  *
  */

 #include <linux/debugfs.h>
 #include <linux/rtnetlink.h>
 #include "ieee80211_i.h"
 #include "driver-ops.h"
 #include "rate.h"
 #include "debugfs.h"

 #define DEBUGFS_FORMAT_BUFFER_SIZE 100

 #define TX_LATENCY_BIN_DELIMTER_C ','
 #define TX_LATENCY_BIN_DELIMTER_S ","
 #define TX_LATENCY_BINS_DISABLED "enable(bins disabled)\n"
 #define TX_LATENCY_DISABLED "disable\n"


 /*
  * Display if Tx latency statistics & bins are enabled/disabled
  */
 static ssize_t sta_tx_latency_stat_read(struct file *file,
 					char __user *userbuf,
 					size_t count, loff_t *ppos)
 {
 	struct ieee80211_local *local = file->private_data;
 	struct ieee80211_tx_latency_bin_ranges  *tx_latency;
 	char *buf;
 	int bufsz, i, ret;
 	int pos = 0;

 	rcu_read_lock();

 	tx_latency = rcu_dereference(local->tx_latency);

 	if (tx_latency && tx_latency->n_ranges) {
 		bufsz = tx_latency->n_ranges * 15;
 		buf = kzalloc(bufsz, GFP_ATOMIC);
 		if (!buf)
 			goto err;

 		for (i = 0; i < tx_latency->n_ranges; i++)
 			pos += scnprintf(buf + pos, bufsz - pos, "%d,",
 					 tx_latency->ranges[i]);
 		pos += scnprintf(buf + pos, bufsz - pos, "\n");
 	} else if (tx_latency) {
 		bufsz = sizeof(TX_LATENCY_BINS_DISABLED) + 1;
 		buf = kzalloc(bufsz, GFP_ATOMIC);
 		if (!buf)
 			goto err;

 		pos += scnprintf(buf + pos, bufsz - pos, "%s\n",
 				 TX_LATENCY_BINS_DISABLED);
 	} else {
 		bufsz = sizeof(TX_LATENCY_DISABLED) + 1;
 		buf = kzalloc(bufsz, GFP_ATOMIC);
 		if (!buf)
 			goto err;

 		pos += scnprintf(buf + pos, bufsz - pos, "%s\n",
 				 TX_LATENCY_DISABLED);
 	}

 	rcu_read_unlock();

 	ret = simple_read_from_buffer(userbuf, count, ppos, buf, pos);
 	kfree(buf);

 	return ret;
 err:
 	rcu_read_unlock();
 	return -ENOMEM;
 }

 /*
  * Receive input from user regarding Tx latency statistics
  * The input should indicate if Tx latency statistics and bins are
  * enabled/disabled.
  * If bins are enabled input should indicate the amount of different bins and
  * their ranges. Each bin will count how many Tx frames transmitted within the
  * appropriate latency.
  * Legal input is:
  * a) "enable(bins disabled)" - to enable only general statistics
  * b) "a,b,c,d,...z" - to enable general statistics and bins, where all are
  * numbers and a < b < c < d.. < z
  * c) "disable" - disable all statistics
  * NOTE: must configure Tx latency statistics bins before stations connected.
  */

 static ssize_t sta_tx_latency_stat_write(struct file *file,
 					 const char __user *userbuf,
 					 size_t count, loff_t *ppos)
 {
 	struct ieee80211_local *local = file->private_data;
 	char buf[128] = {};
 	char *bins = buf;
 	char *token;
 	int buf_size, i, alloc_size;
 	int prev_bin = 0;
 	int n_ranges = 0;
 	int ret = count;
 	struct ieee80211_tx_latency_bin_ranges  *tx_latency;

 	if (sizeof(buf) <= count)
 		return -EINVAL;
 	buf_size = count;
 	if (copy_from_user(buf, userbuf, buf_size))
 		return -EFAULT;

 	mutex_lock(&local->sta_mtx);

 	/* cannot change config once we have stations */
 	if (local->num_sta)
 		goto unlock;

 	tx_latency =
 		rcu_dereference_protected(local->tx_latency,
 					  lockdep_is_held(&local->sta_mtx));

 	/* disable Tx statistics */
 	if (!strcmp(buf, TX_LATENCY_DISABLED)) {
 		if (!tx_latency)
 			goto unlock;
 		rcu_assign_pointer(local->tx_latency, NULL);
 		synchronize_rcu();
 		kfree(tx_latency);
 		goto unlock;
 	}

 	/* Tx latency already enabled */
 	if (tx_latency)
 		goto unlock;

 	if (strcmp(TX_LATENCY_BINS_DISABLED, buf)) {
 		/* check how many bins and between what ranges user requested */
 		token = buf;
 		while (*token != '\0') {
 			if (*token == TX_LATENCY_BIN_DELIMTER_C)
 				n_ranges++;
 			token++;
 		}
 		n_ranges++;
 	}

 	alloc_size = sizeof(struct ieee80211_tx_latency_bin_ranges) +
 		     n_ranges * sizeof(u32);
 	tx_latency = kzalloc(alloc_size, GFP_ATOMIC);
 	if (!tx_latency) {
 		ret = -ENOMEM;
 		goto unlock;
 	}
 	tx_latency->n_ranges = n_ranges;
 	for (i = 0; i < n_ranges; i++) { /* setting bin ranges */
 		token = strsep(&bins, TX_LATENCY_BIN_DELIMTER_S);
 		sscanf(token, "%d", &tx_latency->ranges[i]);
 		/* bins values should be in ascending order */
 		if (prev_bin >= tx_latency->ranges[i]) {
 			ret = -EINVAL;
 			kfree(tx_latency);
 			goto unlock;
 		}
 		prev_bin = tx_latency->ranges[i];
 	}
 	rcu_assign_pointer(local->tx_latency, tx_latency);

 unlock:
 	mutex_unlock(&local->sta_mtx);

 	return ret;
 }

 static const struct file_operations stats_tx_latency_ops = {
 	.write = sta_tx_latency_stat_write,
 	.read = sta_tx_latency_stat_read,
 	.open = simple_open,
 	.llseek = generic_file_llseek,
 };

 int mac80211_format_buffer(char __user *userbuf, size_t count,
 				  loff_t *ppos, char *fmt, ...)
 {
 	va_list args;
 	char buf[DEBUGFS_FORMAT_BUFFER_SIZE];
 	int res;

 	va_start(args, fmt);
 	res = vscnprintf(buf, sizeof(buf), fmt, args);
 	va_end(args);

 	return simple_read_from_buffer(userbuf, count, ppos, buf, res);
 }

 #define DEBUGFS_READONLY_FILE_FN(name, fmt, value...)			\
 static ssize_t name## _read(struct file *file, char __user *userbuf,	\
 			    size_t count, loff_t *ppos)			\
 {									\
 	struct ieee80211_local *local = file->private_data;		\
 									\
 	return mac80211_format_buffer(userbuf, count, ppos, 		\
 				      fmt "\n", ##value);		\
 }

 #define DEBUGFS_READONLY_FILE_OPS(name)			\
 static const struct file_operations name## _ops = {			\
 	.read = name## _read,						\
 	.open = simple_open,						\
 	.llseek = generic_file_llseek,					\
 };

 #define DEBUGFS_READONLY_FILE(name, fmt, value...)		\
 	DEBUGFS_READONLY_FILE_FN(name, fmt, value)		\
 	DEBUGFS_READONLY_FILE_OPS(name)

 #define DEBUGFS_ADD(name)						\
 	debugfs_create_file(#name, 0400, phyd, local, &name## _ops);

 #define DEBUGFS_ADD_MODE(name, mode)					\
 	debugfs_create_file(#name, mode, phyd, local, &name## _ops);


 DEBUGFS_READONLY_FILE(user_power, "%d",
 		      local->user_power_level);
 DEBUGFS_READONLY_FILE(power, "%d",
 		      local->hw.conf.power_level);
 DEBUGFS_READONLY_FILE(total_ps_buffered, "%d",
 		      local->total_ps_buffered);
 DEBUGFS_READONLY_FILE(wep_iv, "%#08x",
 		      local->wep_iv & 0xffffff);
 DEBUGFS_READONLY_FILE(rate_ctrl_alg, "%s",
 	local->rate_ctrl ? local->rate_ctrl->ops->name : "hw/driver");

 #ifdef CONFIG_PM
 static ssize_t reset_write(struct file *file, const char __user *user_buf,
 			   size_t count, loff_t *ppos)
 {
 	struct ieee80211_local *local = file->private_data;

 	rtnl_lock();
 	__ieee80211_suspend(&local->hw, NULL);
 	__ieee80211_resume(&local->hw);
 	rtnl_unlock();

 	return count;
 }

 static const struct file_operations reset_ops = {
 	.write = reset_write,
 	.open = simple_open,
 	.llseek = noop_llseek,
 };
 #endif

 static ssize_t hwflags_read(struct file *file, char __user *user_buf,
 			    size_t count, loff_t *ppos)
 {
 	struct ieee80211_local *local = file->private_data;
 	int mxln = 500;
 	ssize_t rv;
 	char *buf = kzalloc(mxln, GFP_KERNEL);
 	int sf = 0; /* how many written so far */

 	if (!buf)
 		return 0;

 	sf += scnprintf(buf, mxln - sf, "0x%x\n", local->hw.flags);
 	if (local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL)
 		sf += scnprintf(buf + sf, mxln - sf, "HAS_RATE_CONTROL\n");
 	if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
 		sf += scnprintf(buf + sf, mxln - sf, "RX_INCLUDES_FCS\n");
 	if (local->hw.flags & IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING)
 		sf += scnprintf(buf + sf, mxln - sf,
 				"HOST_BCAST_PS_BUFFERING\n");
 	if (local->hw.flags & IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE)
 		sf += scnprintf(buf + sf, mxln - sf,
 				"2GHZ_SHORT_SLOT_INCAPABLE\n");
 	if (local->hw.flags & IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE)
 		sf += scnprintf(buf + sf, mxln - sf,
 				"2GHZ_SHORT_PREAMBLE_INCAPABLE\n");
 	if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC)
 		sf += scnprintf(buf + sf, mxln - sf, "SIGNAL_UNSPEC\n");
 	if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
 		sf += scnprintf(buf + sf, mxln - sf, "SIGNAL_DBM\n");
 	if (local->hw.flags & IEEE80211_HW_NEED_DTIM_BEFORE_ASSOC)
 		sf += scnprintf(buf + sf, mxln - sf,
 				"NEED_DTIM_BEFORE_ASSOC\n");
 	if (local->hw.flags & IEEE80211_HW_SPECTRUM_MGMT)
 		sf += scnprintf(buf + sf, mxln - sf, "SPECTRUM_MGMT\n");
 	if (local->hw.flags & IEEE80211_HW_AMPDU_AGGREGATION)
 		sf += scnprintf(buf + sf, mxln - sf, "AMPDU_AGGREGATION\n");
 	if (local->hw.flags & IEEE80211_HW_SUPPORTS_PS)
 		sf += scnprintf(buf + sf, mxln - sf, "SUPPORTS_PS\n");
 	if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
 		sf += scnprintf(buf + sf, mxln - sf, "PS_NULLFUNC_STACK\n");
 	if (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)
 		sf += scnprintf(buf + sf, mxln - sf, "SUPPORTS_DYNAMIC_PS\n");
 	if (local->hw.flags & IEEE80211_HW_MFP_CAPABLE)
 		sf += scnprintf(buf + sf, mxln - sf, "MFP_CAPABLE\n");
 	if (local->hw.flags & IEEE80211_HW_SUPPORTS_STATIC_SMPS)
 		sf += scnprintf(buf + sf, mxln - sf, "SUPPORTS_STATIC_SMPS\n");
 	if (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_SMPS)
 		sf += scnprintf(buf + sf, mxln - sf,
 				"SUPPORTS_DYNAMIC_SMPS\n");
 	if (local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)
 		sf += scnprintf(buf + sf, mxln - sf, "SUPPORTS_UAPSD\n");
 	if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
 		sf += scnprintf(buf + sf, mxln - sf,
 				"REPORTS_TX_ACK_STATUS\n");
 	if (local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
 		sf += scnprintf(buf + sf, mxln - sf, "CONNECTION_MONITOR\n");
 	if (local->hw.flags & IEEE80211_HW_SUPPORTS_PER_STA_GTK)
 		sf += scnprintf(buf + sf, mxln - sf, "SUPPORTS_PER_STA_GTK\n");
 	if (local->hw.flags & IEEE80211_HW_AP_LINK_PS)
 		sf += scnprintf(buf + sf, mxln - sf, "AP_LINK_PS\n");
 	if (local->hw.flags & IEEE80211_HW_TX_AMPDU_SETUP_IN_HW)
 		sf += scnprintf(buf + sf, mxln - sf, "TX_AMPDU_SETUP_IN_HW\n");

 	rv = simple_read_from_buffer(user_buf, count, ppos, buf, strlen(buf));
 	kfree(buf);
 	return rv;
 }

 static ssize_t queues_read(struct file *file, char __user *user_buf,
 			   size_t count, loff_t *ppos)
 {
 	struct ieee80211_local *local = file->private_data;
 	unsigned long flags;
 	char buf[IEEE80211_MAX_QUEUES * 20];
 	int q, res = 0;

 	spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 	for (q = 0; q < local->hw.queues; q++)
 		res += sprintf(buf + res, "%02d: %#.8lx/%d\n", q,
 				local->queue_stop_reasons[q],
 				skb_queue_len(&local->pending[q]));
 	spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);

 	return simple_read_from_buffer(user_buf, count, ppos, buf, res);
 }

 DEBUGFS_READONLY_FILE_OPS(hwflags);
 DEBUGFS_READONLY_FILE_OPS(queues);

 /* statistics stuff */

 static ssize_t format_devstat_counter(struct ieee80211_local *local,
 	char __user *userbuf,
 	size_t count, loff_t *ppos,
 	int (*printvalue)(struct ieee80211_low_level_stats *stats, char *buf,
 			  int buflen))
 {
 	struct ieee80211_low_level_stats stats;
 	char buf[20];
 	int res;

 	rtnl_lock();
 	res = drv_get_stats(local, &stats);
 	rtnl_unlock();
 	if (res)
 		return res;
 	res = printvalue(&stats, buf, sizeof(buf));
 	return simple_read_from_buffer(userbuf, count, ppos, buf, res);
 }

 #define DEBUGFS_DEVSTATS_FILE(name)					\
 static int print_devstats_##name(struct ieee80211_low_level_stats *stats,\
 				 char *buf, int buflen)			\
 {									\
 	return scnprintf(buf, buflen, "%u\n", stats->name);		\
 }									\
 static ssize_t stats_ ##name## _read(struct file *file,			\
 				     char __user *userbuf,		\
 				     size_t count, loff_t *ppos)	\
 {									\
 	return format_devstat_counter(file->private_data,		\
 				      userbuf,				\
 				      count,				\
 				      ppos,				\
 				      print_devstats_##name);		\
 }									\
 									\
 static const struct file_operations stats_ ##name## _ops = {		\
 	.read = stats_ ##name## _read,					\
 	.open = simple_open,						\
 	.llseek = generic_file_llseek,					\
 };

 #define DEBUGFS_STATS_ADD(name, field)					\
 	debugfs_create_u32(#name, 0400, statsd, (u32 *) &field);
 #define DEBUGFS_DEVSTATS_ADD(name)					\
 	debugfs_create_file(#name, 0400, statsd, local, &stats_ ##name## _ops);

 DEBUGFS_DEVSTATS_FILE(dot11ACKFailureCount);
 DEBUGFS_DEVSTATS_FILE(dot11RTSFailureCount);
 DEBUGFS_DEVSTATS_FILE(dot11FCSErrorCount);
 DEBUGFS_DEVSTATS_FILE(dot11RTSSuccessCount);

 void debugfs_hw_add(struct ieee80211_local *local)
 {
 	struct dentry *phyd = local->hw.wiphy->debugfsdir;
 	struct dentry *statsd;

 	if (!phyd)
 		return;

 	local->debugfs.keys = debugfs_create_dir("keys", phyd);

 	DEBUGFS_ADD(total_ps_buffered);
 	DEBUGFS_ADD(wep_iv);
 	DEBUGFS_ADD(queues);
 #ifdef CONFIG_PM
 	DEBUGFS_ADD_MODE(reset, 0200);
 #endif
 	DEBUGFS_ADD(hwflags);
 	DEBUGFS_ADD(user_power);
 	DEBUGFS_ADD(power);

 	statsd = debugfs_create_dir("statistics", phyd);

 	/* if the dir failed, don't put all the other things into the root! */
 	if (!statsd)
 		return;

 	DEBUGFS_STATS_ADD(transmitted_fragment_count,
 		local->dot11TransmittedFragmentCount);
 	DEBUGFS_STATS_ADD(multicast_transmitted_frame_count,
 		local->dot11MulticastTransmittedFrameCount);
 	DEBUGFS_STATS_ADD(failed_count, local->dot11FailedCount);
 	DEBUGFS_STATS_ADD(retry_count, local->dot11RetryCount);
 	DEBUGFS_STATS_ADD(multiple_retry_count,
 		local->dot11MultipleRetryCount);
 	DEBUGFS_STATS_ADD(frame_duplicate_count,
 		local->dot11FrameDuplicateCount);
 	DEBUGFS_STATS_ADD(received_fragment_count,
 		local->dot11ReceivedFragmentCount);
 	DEBUGFS_STATS_ADD(multicast_received_frame_count,
 		local->dot11MulticastReceivedFrameCount);
 	DEBUGFS_STATS_ADD(transmitted_frame_count,
 		local->dot11TransmittedFrameCount);
 #ifdef CONFIG_MAC80211_DEBUG_COUNTERS
 	DEBUGFS_STATS_ADD(tx_handlers_drop, local->tx_handlers_drop);
 	DEBUGFS_STATS_ADD(tx_handlers_queued, local->tx_handlers_queued);
 	DEBUGFS_STATS_ADD(tx_handlers_drop_unencrypted,
 		local->tx_handlers_drop_unencrypted);
 	DEBUGFS_STATS_ADD(tx_handlers_drop_fragment,
 		local->tx_handlers_drop_fragment);
 	DEBUGFS_STATS_ADD(tx_handlers_drop_wep,
 		local->tx_handlers_drop_wep);
 	DEBUGFS_STATS_ADD(tx_handlers_drop_not_assoc,
 		local->tx_handlers_drop_not_assoc);
 	DEBUGFS_STATS_ADD(tx_handlers_drop_unauth_port,
 		local->tx_handlers_drop_unauth_port);
 	DEBUGFS_STATS_ADD(rx_handlers_drop, local->rx_handlers_drop);
 	DEBUGFS_STATS_ADD(rx_handlers_queued, local->rx_handlers_queued);
 	DEBUGFS_STATS_ADD(rx_handlers_drop_nullfunc,
 		local->rx_handlers_drop_nullfunc);
 	DEBUGFS_STATS_ADD(rx_handlers_drop_defrag,
 		local->rx_handlers_drop_defrag);
 	DEBUGFS_STATS_ADD(rx_handlers_drop_short,
 		local->rx_handlers_drop_short);
 	DEBUGFS_STATS_ADD(tx_expand_skb_head,
 		local->tx_expand_skb_head);
 	DEBUGFS_STATS_ADD(tx_expand_skb_head_cloned,
 		local->tx_expand_skb_head_cloned);
 	DEBUGFS_STATS_ADD(rx_expand_skb_head,
 		local->rx_expand_skb_head);
 	DEBUGFS_STATS_ADD(rx_expand_skb_head2,
 		local->rx_expand_skb_head2);
 	DEBUGFS_STATS_ADD(rx_handlers_fragments,
 		local->rx_handlers_fragments);
 	DEBUGFS_STATS_ADD(tx_status_drop,
 		local->tx_status_drop);
 #endif
 	DEBUGFS_DEVSTATS_ADD(dot11ACKFailureCount);
 	DEBUGFS_DEVSTATS_ADD(dot11RTSFailureCount);
 	DEBUGFS_DEVSTATS_ADD(dot11FCSErrorCount);
 	DEBUGFS_DEVSTATS_ADD(dot11RTSSuccessCount);

 	DEBUGFS_DEVSTATS_ADD(tx_latency);
 }

	/*
	* mac80211 debugfs for wireless PHYs
	*
	* Copyright 2007 Johannes Berg <johannes@sipsolutions.net>
	*
	* GPLv2
	*
	*/

	#include <linux/debugfs.h>
	#include <linux/rtnetlink.h>
	#include "ieee80211_i.h"
	#include "driver-ops.h"
	#include "rate.h"
	#include "debugfs.h"

	#define DEBUGFS_FORMAT_BUFFER_SIZE 100

	#define TX_LATENCY_BIN_DELIMTER_C ','
	#define TX_LATENCY_BIN_DELIMTER_S ","
	#define TX_LATENCY_BINS_DISABLED "enable(bins disabled)\n"
	#define TX_LATENCY_DISABLED "disable\n"


	/*
	* Display if Tx latency statistics & bins are enabled/disabled
	*/
	static ssize_t sta_tx_latency_stat_read(struct file *file,
	char __user *userbuf,
	size_t count, loff_t *ppos)
	{
	struct ieee80211_local *local = file->private_data;
	struct ieee80211_tx_latency_bin_ranges *tx_latency;
	char *buf;
	int bufsz, i, ret;
	int pos = 0;

	rcu_read_lock();

	tx_latency = rcu_dereference(local->tx_latency);

	if (tx_latency && tx_latency->n_ranges) {
	bufsz = tx_latency->n_ranges * 15;
	buf = kzalloc(bufsz, GFP_ATOMIC);
	if (!buf)
	goto err;

	for (i = 0; i < tx_latency->n_ranges; i++)
	pos += scnprintf(buf + pos, bufsz - pos, "%d,",
	tx_latency->ranges[i]);
	pos += scnprintf(buf + pos, bufsz - pos, "\n");
	} else if (tx_latency) {
	bufsz = sizeof(TX_LATENCY_BINS_DISABLED) + 1;
	buf = kzalloc(bufsz, GFP_ATOMIC);
	if (!buf)
	goto err;

	pos += scnprintf(buf + pos, bufsz - pos, "%s\n",
	TX_LATENCY_BINS_DISABLED);
	} else {
	bufsz = sizeof(TX_LATENCY_DISABLED) + 1;
	buf = kzalloc(bufsz, GFP_ATOMIC);
	if (!buf)
	goto err;

	pos += scnprintf(buf + pos, bufsz - pos, "%s\n",
	TX_LATENCY_DISABLED);
	}

	rcu_read_unlock();

	ret = simple_read_from_buffer(userbuf, count, ppos, buf, pos);
	kfree(buf);

	return ret;
	err:
	rcu_read_unlock();
	return -ENOMEM;
	}

	/*
	* Receive input from user regarding Tx latency statistics
	* The input should indicate if Tx latency statistics and bins are
	* enabled/disabled.
	* If bins are enabled input should indicate the amount of different bins and
	* their ranges. Each bin will count how many Tx frames transmitted within the
	* appropriate latency.
	* Legal input is:
	* a) "enable(bins disabled)" - to enable only general statistics
	* b) "a,b,c,d,...z" - to enable general statistics and bins, where all are
	* numbers and a < b < c < d.. < z
	* c) "disable" - disable all statistics
	* NOTE: must configure Tx latency statistics bins before stations connected.
	*/

	static ssize_t sta_tx_latency_stat_write(struct file *file,
	const char __user *userbuf,
	size_t count, loff_t *ppos)
	{
	struct ieee80211_local *local = file->private_data;
	char buf[128] = {};
	char *bins = buf;
	char *token;
	int buf_size, i, alloc_size;
	int prev_bin = 0;
	int n_ranges = 0;
	int ret = count;
	struct ieee80211_tx_latency_bin_ranges *tx_latency;

	if (sizeof(buf) <= count)
	return -EINVAL;
	buf_size = count;
	if (copy_from_user(buf, userbuf, buf_size))
	return -EFAULT;

	mutex_lock(&local->sta_mtx);

	/* cannot change config once we have stations */
	if (local->num_sta)
	goto unlock;

	tx_latency =
	rcu_dereference_protected(local->tx_latency,
	lockdep_is_held(&local->sta_mtx));

	/* disable Tx statistics */
	if (!strcmp(buf, TX_LATENCY_DISABLED)) {
	if (!tx_latency)
	goto unlock;
	rcu_assign_pointer(local->tx_latency, NULL);
	synchronize_rcu();
	kfree(tx_latency);
	goto unlock;
	}

	/* Tx latency already enabled */
	if (tx_latency)
	goto unlock;

	if (strcmp(TX_LATENCY_BINS_DISABLED, buf)) {
	/* check how many bins and between what ranges user requested */
	token = buf;
	while (*token != '\0') {
	if (*token == TX_LATENCY_BIN_DELIMTER_C)
	n_ranges++;
	token++;
	}
	n_ranges++;
	}

	alloc_size = sizeof(struct ieee80211_tx_latency_bin_ranges) +
	n_ranges * sizeof(u32);
	tx_latency = kzalloc(alloc_size, GFP_ATOMIC);
	if (!tx_latency) {
	ret = -ENOMEM;
	goto unlock;
	}
	tx_latency->n_ranges = n_ranges;
	for (i = 0; i < n_ranges; i++) { /* setting bin ranges */
	token = strsep(&bins, TX_LATENCY_BIN_DELIMTER_S);
	sscanf(token, "%d", &tx_latency->ranges[i]);
	/* bins values should be in ascending order */
	if (prev_bin >= tx_latency->ranges[i]) {
	ret = -EINVAL;
	kfree(tx_latency);
	goto unlock;
	}
	prev_bin = tx_latency->ranges[i];
	}
	rcu_assign_pointer(local->tx_latency, tx_latency);

	unlock:
	mutex_unlock(&local->sta_mtx);

	return ret;
	}

	static const struct file_operations stats_tx_latency_ops = {
	.write = sta_tx_latency_stat_write,
	.read = sta_tx_latency_stat_read,
	.open = simple_open,
	.llseek = generic_file_llseek,
	};

	int mac80211_format_buffer(char __user *userbuf, size_t count,
	loff_t ppos, char fmt, ...)
	{
	va_list args;
	char buf[DEBUGFS_FORMAT_BUFFER_SIZE];
	int res;

	va_start(args, fmt);
	res = vscnprintf(buf, sizeof(buf), fmt, args);
	va_end(args);

	return simple_read_from_buffer(userbuf, count, ppos, buf, res);
	}

	#define DEBUGFS_READONLY_FILE_FN(name, fmt, value...) \
	static ssize_t name## _read(struct file file, char __user userbuf, \
	size_t count, loff_t *ppos) \
	{ \
	struct ieee80211_local *local = file->private_data; \
	\
	return mac80211_format_buffer(userbuf, count, ppos, \
	fmt "\n", ##value); \
	}

	#define DEBUGFS_READONLY_FILE_OPS(name) \
	static const struct file_operations name## _ops = { \
	.read = name## _read, \
	.open = simple_open, \
	.llseek = generic_file_llseek, \
	};

	#define DEBUGFS_READONLY_FILE(name, fmt, value...) \
	DEBUGFS_READONLY_FILE_FN(name, fmt, value) \
	DEBUGFS_READONLY_FILE_OPS(name)

	#define DEBUGFS_ADD(name) \
	debugfs_create_file(#name, 0400, phyd, local, &name## _ops);

	#define DEBUGFS_ADD_MODE(name, mode) \
	debugfs_create_file(#name, mode, phyd, local, &name## _ops);


	DEBUGFS_READONLY_FILE(user_power, "%d",
	local->user_power_level);
	DEBUGFS_READONLY_FILE(power, "%d",
	local->hw.conf.power_level);
	DEBUGFS_READONLY_FILE(total_ps_buffered, "%d",
	local->total_ps_buffered);
	DEBUGFS_READONLY_FILE(wep_iv, "%#08x",
	local->wep_iv & 0xffffff);
	DEBUGFS_READONLY_FILE(rate_ctrl_alg, "%s",
	local->rate_ctrl ? local->rate_ctrl->ops->name : "hw/driver");

	#ifdef CONFIG_PM
	static ssize_t reset_write(struct file file, const char __user user_buf,
	size_t count, loff_t *ppos)
	{
	struct ieee80211_local *local = file->private_data;

	rtnl_lock();
	__ieee80211_suspend(&local->hw, NULL);
	__ieee80211_resume(&local->hw);
	rtnl_unlock();

	return count;
	}

	static const struct file_operations reset_ops = {
	.write = reset_write,
	.open = simple_open,
	.llseek = noop_llseek,
	};
	#endif

	static ssize_t hwflags_read(struct file file, char __user user_buf,
	size_t count, loff_t *ppos)
	{
	struct ieee80211_local *local = file->private_data;
	int mxln = 500;
	ssize_t rv;
	char *buf = kzalloc(mxln, GFP_KERNEL);
	int sf = 0; /* how many written so far */

	if (!buf)
	return 0;

	sf += scnprintf(buf, mxln - sf, "0x%x\n", local->hw.flags);
	if (local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL)
	sf += scnprintf(buf + sf, mxln - sf, "HAS_RATE_CONTROL\n");
	if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
	sf += scnprintf(buf + sf, mxln - sf, "RX_INCLUDES_FCS\n");
	if (local->hw.flags & IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING)
	sf += scnprintf(buf + sf, mxln - sf,
	"HOST_BCAST_PS_BUFFERING\n");
	if (local->hw.flags & IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE)
	sf += scnprintf(buf + sf, mxln - sf,
	"2GHZ_SHORT_SLOT_INCAPABLE\n");
	if (local->hw.flags & IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE)
	sf += scnprintf(buf + sf, mxln - sf,
	"2GHZ_SHORT_PREAMBLE_INCAPABLE\n");
	if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC)
	sf += scnprintf(buf + sf, mxln - sf, "SIGNAL_UNSPEC\n");
	if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
	sf += scnprintf(buf + sf, mxln - sf, "SIGNAL_DBM\n");
	if (local->hw.flags & IEEE80211_HW_NEED_DTIM_BEFORE_ASSOC)
	sf += scnprintf(buf + sf, mxln - sf,
	"NEED_DTIM_BEFORE_ASSOC\n");
	if (local->hw.flags & IEEE80211_HW_SPECTRUM_MGMT)
	sf += scnprintf(buf + sf, mxln - sf, "SPECTRUM_MGMT\n");
	if (local->hw.flags & IEEE80211_HW_AMPDU_AGGREGATION)
	sf += scnprintf(buf + sf, mxln - sf, "AMPDU_AGGREGATION\n");
	if (local->hw.flags & IEEE80211_HW_SUPPORTS_PS)
	sf += scnprintf(buf + sf, mxln - sf, "SUPPORTS_PS\n");
	if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
	sf += scnprintf(buf + sf, mxln - sf, "PS_NULLFUNC_STACK\n");
	if (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)
	sf += scnprintf(buf + sf, mxln - sf, "SUPPORTS_DYNAMIC_PS\n");
	if (local->hw.flags & IEEE80211_HW_MFP_CAPABLE)
	sf += scnprintf(buf + sf, mxln - sf, "MFP_CAPABLE\n");
	if (local->hw.flags & IEEE80211_HW_SUPPORTS_STATIC_SMPS)
	sf += scnprintf(buf + sf, mxln - sf, "SUPPORTS_STATIC_SMPS\n");
	if (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_SMPS)
	sf += scnprintf(buf + sf, mxln - sf,
	"SUPPORTS_DYNAMIC_SMPS\n");
	if (local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)
	sf += scnprintf(buf + sf, mxln - sf, "SUPPORTS_UAPSD\n");
	if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
	sf += scnprintf(buf + sf, mxln - sf,
	"REPORTS_TX_ACK_STATUS\n");
	if (local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
	sf += scnprintf(buf + sf, mxln - sf, "CONNECTION_MONITOR\n");
	if (local->hw.flags & IEEE80211_HW_SUPPORTS_PER_STA_GTK)
	sf += scnprintf(buf + sf, mxln - sf, "SUPPORTS_PER_STA_GTK\n");
	if (local->hw.flags & IEEE80211_HW_AP_LINK_PS)
	sf += scnprintf(buf + sf, mxln - sf, "AP_LINK_PS\n");
	if (local->hw.flags & IEEE80211_HW_TX_AMPDU_SETUP_IN_HW)
	sf += scnprintf(buf + sf, mxln - sf, "TX_AMPDU_SETUP_IN_HW\n");

	rv = simple_read_from_buffer(user_buf, count, ppos, buf, strlen(buf));
	kfree(buf);
	return rv;
	}

	static ssize_t queues_read(struct file file, char __user user_buf,
	size_t count, loff_t *ppos)
	{
	struct ieee80211_local *local = file->private_data;
	unsigned long flags;
	char buf[IEEE80211_MAX_QUEUES * 20];
	int q, res = 0;

	spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
	for (q = 0; q < local->hw.queues; q++)
	res += sprintf(buf + res, "%02d: %#.8lx/%d\n", q,
	local->queue_stop_reasons[q],
	skb_queue_len(&local->pending[q]));
	spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);

	return simple_read_from_buffer(user_buf, count, ppos, buf, res);
	}

	DEBUGFS_READONLY_FILE_OPS(hwflags);
	DEBUGFS_READONLY_FILE_OPS(queues);

	/* statistics stuff */

	static ssize_t format_devstat_counter(struct ieee80211_local *local,
	char __user *userbuf,
	size_t count, loff_t *ppos,
	int (printvalue)(struct ieee80211_low_level_stats stats, char *buf,
	int buflen))
	{
	struct ieee80211_low_level_stats stats;
	char buf[20];
	int res;

	rtnl_lock();
	res = drv_get_stats(local, &stats);
	rtnl_unlock();
	if (res)
	return res;
	res = printvalue(&stats, buf, sizeof(buf));
	return simple_read_from_buffer(userbuf, count, ppos, buf, res);
	}

	#define DEBUGFS_DEVSTATS_FILE(name) \
	static int print_devstats_##name(struct ieee80211_low_level_stats *stats,\
	char *buf, int buflen) \
	{ \
	return scnprintf(buf, buflen, "%u\n", stats->name); \
	} \
	static ssize_t stats_ ##name## _read(struct file *file, \
	char __user *userbuf, \
	size_t count, loff_t *ppos) \
	{ \
	return format_devstat_counter(file->private_data, \
	userbuf, \
	count, \
	ppos, \
	print_devstats_##name); \
	} \
	\
	static const struct file_operations stats_ ##name## _ops = { \
	.read = stats_ ##name## _read, \
	.open = simple_open, \
	.llseek = generic_file_llseek, \
	};

	#define DEBUGFS_STATS_ADD(name, field) \
	debugfs_create_u32(#name, 0400, statsd, (u32 *) &field);
	#define DEBUGFS_DEVSTATS_ADD(name) \
	debugfs_create_file(#name, 0400, statsd, local, &stats_ ##name## _ops);

	DEBUGFS_DEVSTATS_FILE(dot11ACKFailureCount);
	DEBUGFS_DEVSTATS_FILE(dot11RTSFailureCount);
	DEBUGFS_DEVSTATS_FILE(dot11FCSErrorCount);
	DEBUGFS_DEVSTATS_FILE(dot11RTSSuccessCount);

	void debugfs_hw_add(struct ieee80211_local *local)
	{
	struct dentry *phyd = local->hw.wiphy->debugfsdir;
	struct dentry *statsd;

	if (!phyd)
	return;

	local->debugfs.keys = debugfs_create_dir("keys", phyd);

	DEBUGFS_ADD(total_ps_buffered);
	DEBUGFS_ADD(wep_iv);
	DEBUGFS_ADD(queues);
	#ifdef CONFIG_PM
	DEBUGFS_ADD_MODE(reset, 0200);
	#endif
	DEBUGFS_ADD(hwflags);
	DEBUGFS_ADD(user_power);
	DEBUGFS_ADD(power);

	statsd = debugfs_create_dir("statistics", phyd);

	/* if the dir failed, don't put all the other things into the root! */
	if (!statsd)
	return;

	DEBUGFS_STATS_ADD(transmitted_fragment_count,
	local->dot11TransmittedFragmentCount);
	DEBUGFS_STATS_ADD(multicast_transmitted_frame_count,
	local->dot11MulticastTransmittedFrameCount);
	DEBUGFS_STATS_ADD(failed_count, local->dot11FailedCount);
	DEBUGFS_STATS_ADD(retry_count, local->dot11RetryCount);
	DEBUGFS_STATS_ADD(multiple_retry_count,
	local->dot11MultipleRetryCount);
	DEBUGFS_STATS_ADD(frame_duplicate_count,
	local->dot11FrameDuplicateCount);
	DEBUGFS_STATS_ADD(received_fragment_count,
	local->dot11ReceivedFragmentCount);
	DEBUGFS_STATS_ADD(multicast_received_frame_count,
	local->dot11MulticastReceivedFrameCount);
	DEBUGFS_STATS_ADD(transmitted_frame_count,
	local->dot11TransmittedFrameCount);
	#ifdef CONFIG_MAC80211_DEBUG_COUNTERS
	DEBUGFS_STATS_ADD(tx_handlers_drop, local->tx_handlers_drop);
	DEBUGFS_STATS_ADD(tx_handlers_queued, local->tx_handlers_queued);
	DEBUGFS_STATS_ADD(tx_handlers_drop_unencrypted,
	local->tx_handlers_drop_unencrypted);
	DEBUGFS_STATS_ADD(tx_handlers_drop_fragment,
	local->tx_handlers_drop_fragment);
	DEBUGFS_STATS_ADD(tx_handlers_drop_wep,
	local->tx_handlers_drop_wep);
	DEBUGFS_STATS_ADD(tx_handlers_drop_not_assoc,
	local->tx_handlers_drop_not_assoc);
	DEBUGFS_STATS_ADD(tx_handlers_drop_unauth_port,
	local->tx_handlers_drop_unauth_port);
	DEBUGFS_STATS_ADD(rx_handlers_drop, local->rx_handlers_drop);
	DEBUGFS_STATS_ADD(rx_handlers_queued, local->rx_handlers_queued);
	DEBUGFS_STATS_ADD(rx_handlers_drop_nullfunc,
	local->rx_handlers_drop_nullfunc);
	DEBUGFS_STATS_ADD(rx_handlers_drop_defrag,
	local->rx_handlers_drop_defrag);
	DEBUGFS_STATS_ADD(rx_handlers_drop_short,
	local->rx_handlers_drop_short);
	DEBUGFS_STATS_ADD(tx_expand_skb_head,
	local->tx_expand_skb_head);
	DEBUGFS_STATS_ADD(tx_expand_skb_head_cloned,
	local->tx_expand_skb_head_cloned);
	DEBUGFS_STATS_ADD(rx_expand_skb_head,
	local->rx_expand_skb_head);
	DEBUGFS_STATS_ADD(rx_expand_skb_head2,
	local->rx_expand_skb_head2);
	DEBUGFS_STATS_ADD(rx_handlers_fragments,
	local->rx_handlers_fragments);
	DEBUGFS_STATS_ADD(tx_status_drop,
	local->tx_status_drop);
	#endif
	DEBUGFS_DEVSTATS_ADD(dot11ACKFailureCount);
	DEBUGFS_DEVSTATS_ADD(dot11RTSFailureCount);
	DEBUGFS_DEVSTATS_ADD(dot11FCSErrorCount);
	DEBUGFS_DEVSTATS_ADD(dot11RTSSuccessCount);

	DEBUGFS_DEVSTATS_ADD(tx_latency);
	}