atheros: put atheros wireless drivers into ath/

Signed-off-by: Luis R. Rodriguez <lrodriguez@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 562 insertions, 0 deletions

diff --git a/drivers/net/wireless/ath/ath9k/debug.c b/drivers/net/wireless/ath/ath9k/debug.c
new file mode 100644
index 00000000000..97df20cbf52
--- /dev/null
+++ b/drivers/net/wireless/ath/ath9k/debug.c
@@ -0,0 +1,562 @@
+/*
+ * Copyright (c) 2008-2009 Atheros Communications 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 <asm/unaligned.h>
+
+#include "ath9k.h"
+
+static unsigned int ath9k_debug = DBG_DEFAULT;
+module_param_named(debug, ath9k_debug, uint, 0);
+
+static struct dentry *ath9k_debugfs_root;
+
+void DPRINTF(struct ath_softc *sc, int dbg_mask, const char *fmt, ...)
+{
+	if (!sc)
+		return;
+
+	if (sc->debug.debug_mask & dbg_mask) {
+		va_list args;
+
+		va_start(args, fmt);
+		printk(KERN_DEBUG "ath9k: ");
+		vprintk(fmt, args);
+		va_end(args);
+	}
+}
+
+static int ath9k_debugfs_open(struct inode *inode, struct file *file)
+{
+	file->private_data = inode->i_private;
+	return 0;
+}
+
+static ssize_t read_file_dma(struct file *file, char __user *user_buf,
+			     size_t count, loff_t *ppos)
+{
+	struct ath_softc *sc = file->private_data;
+	struct ath_hw *ah = sc->sc_ah;
+	char buf[1024];
+	unsigned int len = 0;
+	u32 val[ATH9K_NUM_DMA_DEBUG_REGS];
+	int i, qcuOffset = 0, dcuOffset = 0;
+	u32 *qcuBase = &val[0], *dcuBase = &val[4];
+
+	REG_WRITE(ah, AR_MACMISC,
+		  ((AR_MACMISC_DMA_OBS_LINE_8 << AR_MACMISC_DMA_OBS_S) |
+		   (AR_MACMISC_MISC_OBS_BUS_1 <<
+		    AR_MACMISC_MISC_OBS_BUS_MSB_S)));
+
+	len += snprintf(buf + len, sizeof(buf) - len,
+			"Raw DMA Debug values:\n");
+
+	for (i = 0; i < ATH9K_NUM_DMA_DEBUG_REGS; i++) {
+		if (i % 4 == 0)
+			len += snprintf(buf + len, sizeof(buf) - len, "\n");
+
+		val[i] = REG_READ(ah, AR_DMADBG_0 + (i * sizeof(u32)));
+		len += snprintf(buf + len, sizeof(buf) - len, "%d: %08x ",
+				i, val[i]);
+	}
+
+	len += snprintf(buf + len, sizeof(buf) - len, "\n\n");
+	len += snprintf(buf + len, sizeof(buf) - len,
+			"Num QCU: chain_st fsp_ok fsp_st DCU: chain_st\n");
+
+	for (i = 0; i < ATH9K_NUM_QUEUES; i++, qcuOffset += 4, dcuOffset += 5) {
+		if (i == 8) {
+			qcuOffset = 0;
+			qcuBase++;
+		}
+
+		if (i == 6) {
+			dcuOffset = 0;
+			dcuBase++;
+		}
+
+		len += snprintf(buf + len, sizeof(buf) - len,
+			"%2d          %2x      %1x     %2x           %2x\n",
+			i, (*qcuBase & (0x7 << qcuOffset)) >> qcuOffset,
+			(*qcuBase & (0x8 << qcuOffset)) >> (qcuOffset + 3),
+			val[2] & (0x7 << (i * 3)) >> (i * 3),
+			(*dcuBase & (0x1f << dcuOffset)) >> dcuOffset);
+	}
+
+	len += snprintf(buf + len, sizeof(buf) - len, "\n");
+
+	len += snprintf(buf + len, sizeof(buf) - len,
+		"qcu_stitch state:   %2x    qcu_fetch state:        %2x\n",
+		(val[3] & 0x003c0000) >> 18, (val[3] & 0x03c00000) >> 22);
+	len += snprintf(buf + len, sizeof(buf) - len,
+		"qcu_complete state: %2x    dcu_complete state:     %2x\n",
+		(val[3] & 0x1c000000) >> 26, (val[6] & 0x3));
+	len += snprintf(buf + len, sizeof(buf) - len,
+		"dcu_arb state:      %2x    dcu_fp state:           %2x\n",
+		(val[5] & 0x06000000) >> 25, (val[5] & 0x38000000) >> 27);
+	len += snprintf(buf + len, sizeof(buf) - len,
+		"chan_idle_dur:     %3d    chan_idle_dur_valid:     %1d\n",
+		(val[6] & 0x000003fc) >> 2, (val[6] & 0x00000400) >> 10);
+	len += snprintf(buf + len, sizeof(buf) - len,
+		"txfifo_valid_0:      %1d    txfifo_valid_1:          %1d\n",
+		(val[6] & 0x00000800) >> 11, (val[6] & 0x00001000) >> 12);
+	len += snprintf(buf + len, sizeof(buf) - len,
+		"txfifo_dcu_num_0:   %2d    txfifo_dcu_num_1:       %2d\n",
+		(val[6] & 0x0001e000) >> 13, (val[6] & 0x001e0000) >> 17);
+
+	len += snprintf(buf + len, sizeof(buf) - len, "pcu observe: 0x%x \n",
+			REG_READ(ah, AR_OBS_BUS_1));
+	len += snprintf(buf + len, sizeof(buf) - len,
+			"AR_CR: 0x%x \n", REG_READ(ah, AR_CR));
+
+	return simple_read_from_buffer(user_buf, count, ppos, buf, len);
+}
+
+static const struct file_operations fops_dma = {
+	.read = read_file_dma,
+	.open = ath9k_debugfs_open,
+	.owner = THIS_MODULE
+};
+
+
+void ath_debug_stat_interrupt(struct ath_softc *sc, enum ath9k_int status)
+{
+	if (status)
+		sc->debug.stats.istats.total++;
+	if (status & ATH9K_INT_RX)
+		sc->debug.stats.istats.rxok++;
+	if (status & ATH9K_INT_RXEOL)
+		sc->debug.stats.istats.rxeol++;
+	if (status & ATH9K_INT_RXORN)
+		sc->debug.stats.istats.rxorn++;
+	if (status & ATH9K_INT_TX)
+		sc->debug.stats.istats.txok++;
+	if (status & ATH9K_INT_TXURN)
+		sc->debug.stats.istats.txurn++;
+	if (status & ATH9K_INT_MIB)
+		sc->debug.stats.istats.mib++;
+	if (status & ATH9K_INT_RXPHY)
+		sc->debug.stats.istats.rxphyerr++;
+	if (status & ATH9K_INT_RXKCM)
+		sc->debug.stats.istats.rx_keycache_miss++;
+	if (status & ATH9K_INT_SWBA)
+		sc->debug.stats.istats.swba++;
+	if (status & ATH9K_INT_BMISS)
+		sc->debug.stats.istats.bmiss++;
+	if (status & ATH9K_INT_BNR)
+		sc->debug.stats.istats.bnr++;
+	if (status & ATH9K_INT_CST)
+		sc->debug.stats.istats.cst++;
+	if (status & ATH9K_INT_GTT)
+		sc->debug.stats.istats.gtt++;
+	if (status & ATH9K_INT_TIM)
+		sc->debug.stats.istats.tim++;
+	if (status & ATH9K_INT_CABEND)
+		sc->debug.stats.istats.cabend++;
+	if (status & ATH9K_INT_DTIMSYNC)
+		sc->debug.stats.istats.dtimsync++;
+	if (status & ATH9K_INT_DTIM)
+		sc->debug.stats.istats.dtim++;
+}
+
+static ssize_t read_file_interrupt(struct file *file, char __user *user_buf,
+				   size_t count, loff_t *ppos)
+{
+	struct ath_softc *sc = file->private_data;
+	char buf[512];
+	unsigned int len = 0;
+
+	len += snprintf(buf + len, sizeof(buf) - len,
+		"%8s: %10u\n", "RX", sc->debug.stats.istats.rxok);
+	len += snprintf(buf + len, sizeof(buf) - len,
+		"%8s: %10u\n", "RXEOL", sc->debug.stats.istats.rxeol);
+	len += snprintf(buf + len, sizeof(buf) - len,
+		"%8s: %10u\n", "RXORN", sc->debug.stats.istats.rxorn);
+	len += snprintf(buf + len, sizeof(buf) - len,
+		"%8s: %10u\n", "TX", sc->debug.stats.istats.txok);
+	len += snprintf(buf + len, sizeof(buf) - len,
+		"%8s: %10u\n", "TXURN", sc->debug.stats.istats.txurn);
+	len += snprintf(buf + len, sizeof(buf) - len,
+		"%8s: %10u\n", "MIB", sc->debug.stats.istats.mib);
+	len += snprintf(buf + len, sizeof(buf) - len,
+		"%8s: %10u\n", "RXPHY", sc->debug.stats.istats.rxphyerr);
+	len += snprintf(buf + len, sizeof(buf) - len,
+		"%8s: %10u\n", "RXKCM", sc->debug.stats.istats.rx_keycache_miss);
+	len += snprintf(buf + len, sizeof(buf) - len,
+		"%8s: %10u\n", "SWBA", sc->debug.stats.istats.swba);
+	len += snprintf(buf + len, sizeof(buf) - len,
+		"%8s: %10u\n", "BMISS", sc->debug.stats.istats.bmiss);
+	len += snprintf(buf + len, sizeof(buf) - len,
+		"%8s: %10u\n", "BNR", sc->debug.stats.istats.bnr);
+	len += snprintf(buf + len, sizeof(buf) - len,
+		"%8s: %10u\n", "CST", sc->debug.stats.istats.cst);
+	len += snprintf(buf + len, sizeof(buf) - len,
+		"%8s: %10u\n", "GTT", sc->debug.stats.istats.gtt);
+	len += snprintf(buf + len, sizeof(buf) - len,
+		"%8s: %10u\n", "TIM", sc->debug.stats.istats.tim);
+	len += snprintf(buf + len, sizeof(buf) - len,
+		"%8s: %10u\n", "CABEND", sc->debug.stats.istats.cabend);
+	len += snprintf(buf + len, sizeof(buf) - len,
+		"%8s: %10u\n", "DTIMSYNC", sc->debug.stats.istats.dtimsync);
+	len += snprintf(buf + len, sizeof(buf) - len,
+		"%8s: %10u\n", "DTIM", sc->debug.stats.istats.dtim);
+	len += snprintf(buf + len, sizeof(buf) - len,
+		"%8s: %10u\n", "TOTAL", sc->debug.stats.istats.total);
+
+	return simple_read_from_buffer(user_buf, count, ppos, buf, len);
+}
+
+static const struct file_operations fops_interrupt = {
+	.read = read_file_interrupt,
+	.open = ath9k_debugfs_open,
+	.owner = THIS_MODULE
+};
+
+static void ath_debug_stat_11n_rc(struct ath_softc *sc, struct sk_buff *skb)
+{
+	struct ath_tx_info_priv *tx_info_priv = NULL;
+	struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb);
+	struct ieee80211_tx_rate *rates = tx_info->status.rates;
+	int final_ts_idx, idx;
+
+	tx_info_priv = ATH_TX_INFO_PRIV(tx_info);
+	final_ts_idx = tx_info_priv->tx.ts_rateindex;
+	idx = sc->cur_rate_table->info[rates[final_ts_idx].idx].dot11rate;
+
+	sc->debug.stats.n_rcstats[idx].success++;
+}
+
+static void ath_debug_stat_legacy_rc(struct ath_softc *sc, struct sk_buff *skb)
+{
+	struct ath_tx_info_priv *tx_info_priv = NULL;
+	struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb);
+	struct ieee80211_tx_rate *rates = tx_info->status.rates;
+	int final_ts_idx, idx;
+
+	tx_info_priv = ATH_TX_INFO_PRIV(tx_info);
+	final_ts_idx = tx_info_priv->tx.ts_rateindex;
+	idx = rates[final_ts_idx].idx;
+
+	sc->debug.stats.legacy_rcstats[idx].success++;
+}
+
+void ath_debug_stat_rc(struct ath_softc *sc, struct sk_buff *skb)
+{
+	if (conf_is_ht(&sc->hw->conf))
+		ath_debug_stat_11n_rc(sc, skb);
+	else
+		ath_debug_stat_legacy_rc(sc, skb);
+}
+
+/* FIXME: legacy rates, later on .. */
+void ath_debug_stat_retries(struct ath_softc *sc, int rix,
+			    int xretries, int retries, u8 per)
+{
+	if (conf_is_ht(&sc->hw->conf)) {
+		int idx = sc->cur_rate_table->info[rix].dot11rate;
+
+		sc->debug.stats.n_rcstats[idx].xretries += xretries;
+		sc->debug.stats.n_rcstats[idx].retries += retries;
+		sc->debug.stats.n_rcstats[idx].per = per;
+	}
+}
+
+static ssize_t ath_read_file_stat_11n_rc(struct file *file,
+					 char __user *user_buf,
+					 size_t count, loff_t *ppos)
+{
+	struct ath_softc *sc = file->private_data;
+	char buf[1024];
+	unsigned int len = 0;
+	int i = 0;
+
+	len += sprintf(buf, "%7s %13s %8s %8s %6s\n\n", "Rate", "Success",
+		       "Retries", "XRetries", "PER");
+
+	for (i = 0; i <= 15; i++) {
+		len += snprintf(buf + len, sizeof(buf) - len,
+				"%5s%3d: %8u %8u %8u %8u\n", "MCS", i,
+				sc->debug.stats.n_rcstats[i].success,
+				sc->debug.stats.n_rcstats[i].retries,
+				sc->debug.stats.n_rcstats[i].xretries,
+				sc->debug.stats.n_rcstats[i].per);
+	}
+
+	return simple_read_from_buffer(user_buf, count, ppos, buf, len);
+}
+
+static ssize_t ath_read_file_stat_legacy_rc(struct file *file,
+					    char __user *user_buf,
+					    size_t count, loff_t *ppos)
+{
+	struct ath_softc *sc = file->private_data;
+	char buf[512];
+	unsigned int len = 0;
+	int i = 0;
+
+	len += sprintf(buf, "%7s %13s\n\n", "Rate", "Success");
+
+	for (i = 0; i < sc->cur_rate_table->rate_cnt; i++) {
+		len += snprintf(buf + len, sizeof(buf) - len, "%5u: %12u\n",
+				sc->cur_rate_table->info[i].ratekbps / 1000,
+				sc->debug.stats.legacy_rcstats[i].success);
+	}
+
+	return simple_read_from_buffer(user_buf, count, ppos, buf, len);
+}
+
+static ssize_t read_file_rcstat(struct file *file, char __user *user_buf,
+				size_t count, loff_t *ppos)
+{
+	struct ath_softc *sc = file->private_data;
+
+	if (sc->cur_rate_table == NULL)
+		return 0;
+
+	if (conf_is_ht(&sc->hw->conf))
+		return ath_read_file_stat_11n_rc(file, user_buf, count, ppos);
+	else
+		return ath_read_file_stat_legacy_rc(file, user_buf, count ,ppos);
+}
+
+static const struct file_operations fops_rcstat = {
+	.read = read_file_rcstat,
+	.open = ath9k_debugfs_open,
+	.owner = THIS_MODULE
+};
+
+static const char * ath_wiphy_state_str(enum ath_wiphy_state state)
+{
+	switch (state) {
+	case ATH_WIPHY_INACTIVE:
+		return "INACTIVE";
+	case ATH_WIPHY_ACTIVE:
+		return "ACTIVE";
+	case ATH_WIPHY_PAUSING:
+		return "PAUSING";
+	case ATH_WIPHY_PAUSED:
+		return "PAUSED";
+	case ATH_WIPHY_SCAN:
+		return "SCAN";
+	}
+	return "?";
+}
+
+static ssize_t read_file_wiphy(struct file *file, char __user *user_buf,
+			       size_t count, loff_t *ppos)
+{
+	struct ath_softc *sc = file->private_data;
+	char buf[512];
+	unsigned int len = 0;
+	int i;
+	u8 addr[ETH_ALEN];
+
+	len += snprintf(buf + len, sizeof(buf) - len,
+			"primary: %s (%s chan=%d ht=%d)\n",
+			wiphy_name(sc->pri_wiphy->hw->wiphy),
+			ath_wiphy_state_str(sc->pri_wiphy->state),
+			sc->pri_wiphy->chan_idx, sc->pri_wiphy->chan_is_ht);
+	for (i = 0; i < sc->num_sec_wiphy; i++) {
+		struct ath_wiphy *aphy = sc->sec_wiphy[i];
+		if (aphy == NULL)
+			continue;
+		len += snprintf(buf + len, sizeof(buf) - len,
+				"secondary: %s (%s chan=%d ht=%d)\n",
+				wiphy_name(aphy->hw->wiphy),
+				ath_wiphy_state_str(aphy->state),
+				aphy->chan_idx, aphy->chan_is_ht);
+	}
+
+	put_unaligned_le32(REG_READ(sc->sc_ah, AR_STA_ID0), addr);
+	put_unaligned_le16(REG_READ(sc->sc_ah, AR_STA_ID1) & 0xffff, addr + 4);
+	len += snprintf(buf + len, sizeof(buf) - len,
+			"addr: %pM\n", addr);
+	put_unaligned_le32(REG_READ(sc->sc_ah, AR_BSSMSKL), addr);
+	put_unaligned_le16(REG_READ(sc->sc_ah, AR_BSSMSKU) & 0xffff, addr + 4);
+	len += snprintf(buf + len, sizeof(buf) - len,
+			"addrmask: %pM\n", addr);
+
+	return simple_read_from_buffer(user_buf, count, ppos, buf, len);
+}
+
+static struct ath_wiphy * get_wiphy(struct ath_softc *sc, const char *name)
+{
+	int i;
+	if (strcmp(name, wiphy_name(sc->pri_wiphy->hw->wiphy)) == 0)
+		return sc->pri_wiphy;
+	for (i = 0; i < sc->num_sec_wiphy; i++) {
+		struct ath_wiphy *aphy = sc->sec_wiphy[i];
+		if (aphy && strcmp(name, wiphy_name(aphy->hw->wiphy)) == 0)
+			return aphy;
+	}
+	return NULL;
+}
+
+static int del_wiphy(struct ath_softc *sc, const char *name)
+{
+	struct ath_wiphy *aphy = get_wiphy(sc, name);
+	if (!aphy)
+		return -ENOENT;
+	return ath9k_wiphy_del(aphy);
+}
+
+static int pause_wiphy(struct ath_softc *sc, const char *name)
+{
+	struct ath_wiphy *aphy = get_wiphy(sc, name);
+	if (!aphy)
+		return -ENOENT;
+	return ath9k_wiphy_pause(aphy);
+}
+
+static int unpause_wiphy(struct ath_softc *sc, const char *name)
+{
+	struct ath_wiphy *aphy = get_wiphy(sc, name);
+	if (!aphy)
+		return -ENOENT;
+	return ath9k_wiphy_unpause(aphy);
+}
+
+static int select_wiphy(struct ath_softc *sc, const char *name)
+{
+	struct ath_wiphy *aphy = get_wiphy(sc, name);
+	if (!aphy)
+		return -ENOENT;
+	return ath9k_wiphy_select(aphy);
+}
+
+static int schedule_wiphy(struct ath_softc *sc, const char *msec)
+{
+	ath9k_wiphy_set_scheduler(sc, simple_strtoul(msec, NULL, 0));
+	return 0;
+}
+
+static ssize_t write_file_wiphy(struct file *file, const char __user *user_buf,
+				size_t count, loff_t *ppos)
+{
+	struct ath_softc *sc = file->private_data;
+	char buf[50];
+	size_t len;
+
+	len = min(count, sizeof(buf) - 1);
+	if (copy_from_user(buf, user_buf, len))
+		return -EFAULT;
+	buf[len] = '\0';
+	if (len > 0 && buf[len - 1] == '\n')
+		buf[len - 1] = '\0';
+
+	if (strncmp(buf, "add", 3) == 0) {
+		int res = ath9k_wiphy_add(sc);
+		if (res < 0)
+			return res;
+	} else if (strncmp(buf, "del=", 4) == 0) {
+		int res = del_wiphy(sc, buf + 4);
+		if (res < 0)
+			return res;
+	} else if (strncmp(buf, "pause=", 6) == 0) {
+		int res = pause_wiphy(sc, buf + 6);
+		if (res < 0)
+			return res;
+	} else if (strncmp(buf, "unpause=", 8) == 0) {
+		int res = unpause_wiphy(sc, buf + 8);
+		if (res < 0)
+			return res;
+	} else if (strncmp(buf, "select=", 7) == 0) {
+		int res = select_wiphy(sc, buf + 7);
+		if (res < 0)
+			return res;
+	} else if (strncmp(buf, "schedule=", 9) == 0) {
+		int res = schedule_wiphy(sc, buf + 9);
+		if (res < 0)
+			return res;
+	} else
+		return -EOPNOTSUPP;
+
+	return count;
+}
+
+static const struct file_operations fops_wiphy = {
+	.read = read_file_wiphy,
+	.write = write_file_wiphy,
+	.open = ath9k_debugfs_open,
+	.owner = THIS_MODULE
+};
+
+
+int ath9k_init_debug(struct ath_softc *sc)
+{
+	sc->debug.debug_mask = ath9k_debug;
+
+	if (!ath9k_debugfs_root)
+		return -ENOENT;
+
+	sc->debug.debugfs_phy = debugfs_create_dir(wiphy_name(sc->hw->wiphy),
+						      ath9k_debugfs_root);
+	if (!sc->debug.debugfs_phy)
+		goto err;
+
+	sc->debug.debugfs_dma = debugfs_create_file("dma", S_IRUGO,
+				       sc->debug.debugfs_phy, sc, &fops_dma);
+	if (!sc->debug.debugfs_dma)
+		goto err;
+
+	sc->debug.debugfs_interrupt = debugfs_create_file("interrupt",
+						     S_IRUGO,
+						     sc->debug.debugfs_phy,
+						     sc, &fops_interrupt);
+	if (!sc->debug.debugfs_interrupt)
+		goto err;
+
+	sc->debug.debugfs_rcstat = debugfs_create_file("rcstat",
+						  S_IRUGO,
+						  sc->debug.debugfs_phy,
+						  sc, &fops_rcstat);
+	if (!sc->debug.debugfs_rcstat)
+		goto err;
+
+	sc->debug.debugfs_wiphy = debugfs_create_file(
+		"wiphy", S_IRUGO | S_IWUSR, sc->debug.debugfs_phy, sc,
+		&fops_wiphy);
+	if (!sc->debug.debugfs_wiphy)
+		goto err;
+
+	return 0;
+err:
+	ath9k_exit_debug(sc);
+	return -ENOMEM;
+}
+
+void ath9k_exit_debug(struct ath_softc *sc)
+{
+	debugfs_remove(sc->debug.debugfs_wiphy);
+	debugfs_remove(sc->debug.debugfs_rcstat);
+	debugfs_remove(sc->debug.debugfs_interrupt);
+	debugfs_remove(sc->debug.debugfs_dma);
+	debugfs_remove(sc->debug.debugfs_phy);
+}
+
+int ath9k_debug_create_root(void)
+{
+	ath9k_debugfs_root = debugfs_create_dir(KBUILD_MODNAME, NULL);
+	if (!ath9k_debugfs_root)
+		return -ENOENT;
+
+	return 0;
+}
+
+void ath9k_debug_remove_root(void)
+{
+	debugfs_remove(ath9k_debugfs_root);
+	ath9k_debugfs_root = NULL;
+}