drivers/net/wireless/ath9k/debug.c - linux-mtk - Git at Google


            
            /*

            
             * Copyright (c) 2008 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 "core.h"

            
            #include "reg.h"

            
            #include "hw.h"


            static unsigned int ath9k_debug = DBG_DEFAULT;

            
            module_param_named(debug, ath9k_debug, uint, 0);


            void DPRINTF(struct ath_softc *sc, int dbg_mask, const char *fmt, ...)

            
            {

            
            	if (!sc)

            
            		return;


            	if (sc->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_hal *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->sc_debug.stats.istats.total++;

            
            	if (status & ATH9K_INT_RX)

            
            		sc->sc_debug.stats.istats.rxok++;

            
            	if (status & ATH9K_INT_RXEOL)

            
            		sc->sc_debug.stats.istats.rxeol++;

            
            	if (status & ATH9K_INT_RXORN)

            
            		sc->sc_debug.stats.istats.rxorn++;

            
            	if (status & ATH9K_INT_TX)

            
            		sc->sc_debug.stats.istats.txok++;

            
            	if (status & ATH9K_INT_TXURN)

            
            		sc->sc_debug.stats.istats.txurn++;

            
            	if (status & ATH9K_INT_MIB)

            
            		sc->sc_debug.stats.istats.mib++;

            
            	if (status & ATH9K_INT_RXPHY)

            
            		sc->sc_debug.stats.istats.rxphyerr++;

            
            	if (status & ATH9K_INT_RXKCM)

            
            		sc->sc_debug.stats.istats.rx_keycache_miss++;

            
            	if (status & ATH9K_INT_SWBA)

            
            		sc->sc_debug.stats.istats.swba++;

            
            	if (status & ATH9K_INT_BMISS)

            
            		sc->sc_debug.stats.istats.bmiss++;

            
            	if (status & ATH9K_INT_BNR)

            
            		sc->sc_debug.stats.istats.bnr++;

            
            	if (status & ATH9K_INT_CST)

            
            		sc->sc_debug.stats.istats.cst++;

            
            	if (status & ATH9K_INT_GTT)

            
            		sc->sc_debug.stats.istats.gtt++;

            
            	if (status & ATH9K_INT_TIM)

            
            		sc->sc_debug.stats.istats.tim++;

            
            	if (status & ATH9K_INT_CABEND)

            
            		sc->sc_debug.stats.istats.cabend++;

            
            	if (status & ATH9K_INT_DTIMSYNC)

            
            		sc->sc_debug.stats.istats.dtimsync++;

            
            	if (status & ATH9K_INT_DTIM)

            
            		sc->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->sc_debug.stats.istats.rxok);

            
            	len += snprintf(buf + len, sizeof(buf) - len,

            
            		"%8s: %10u\n", "RXEOL", sc->sc_debug.stats.istats.rxeol);

            
            	len += snprintf(buf + len, sizeof(buf) - len,

            
            		"%8s: %10u\n", "RXORN", sc->sc_debug.stats.istats.rxorn);

            
            	len += snprintf(buf + len, sizeof(buf) - len,

            
            		"%8s: %10u\n", "TX", sc->sc_debug.stats.istats.txok);

            
            	len += snprintf(buf + len, sizeof(buf) - len,

            
            		"%8s: %10u\n", "TXURN", sc->sc_debug.stats.istats.txurn);

            
            	len += snprintf(buf + len, sizeof(buf) - len,

            
            		"%8s: %10u\n", "MIB", sc->sc_debug.stats.istats.mib);

            
            	len += snprintf(buf + len, sizeof(buf) - len,

            
            		"%8s: %10u\n", "RXPHY", sc->sc_debug.stats.istats.rxphyerr);

            
            	len += snprintf(buf + len, sizeof(buf) - len,

            
            		"%8s: %10u\n", "RXKCM", sc->sc_debug.stats.istats.rx_keycache_miss);

            
            	len += snprintf(buf + len, sizeof(buf) - len,

            
            		"%8s: %10u\n", "SWBA", sc->sc_debug.stats.istats.swba);

            
            	len += snprintf(buf + len, sizeof(buf) - len,

            
            		"%8s: %10u\n", "BMISS", sc->sc_debug.stats.istats.bmiss);

            
            	len += snprintf(buf + len, sizeof(buf) - len,

            
            		"%8s: %10u\n", "BNR", sc->sc_debug.stats.istats.bnr);

            
            	len += snprintf(buf + len, sizeof(buf) - len,

            
            		"%8s: %10u\n", "CST", sc->sc_debug.stats.istats.cst);

            
            	len += snprintf(buf + len, sizeof(buf) - len,

            
            		"%8s: %10u\n", "GTT", sc->sc_debug.stats.istats.gtt);

            
            	len += snprintf(buf + len, sizeof(buf) - len,

            
            		"%8s: %10u\n", "TIM", sc->sc_debug.stats.istats.tim);

            
            	len += snprintf(buf + len, sizeof(buf) - len,

            
            		"%8s: %10u\n", "CABEND", sc->sc_debug.stats.istats.cabend);

            
            	len += snprintf(buf + len, sizeof(buf) - len,

            
            		"%8s: %10u\n", "DTIMSYNC", sc->sc_debug.stats.istats.dtimsync);

            
            	len += snprintf(buf + len, sizeof(buf) - len,

            
            		"%8s: %10u\n", "DTIM", sc->sc_debug.stats.istats.dtim);

            
            	len += snprintf(buf + len, sizeof(buf) - len,

            
            		"%8s: %10u\n", "TOTAL", sc->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

            
            };


            int ath9k_init_debug(struct ath_softc *sc)

            
            {

            
            	sc->sc_debug.debug_mask = ath9k_debug;


            	sc->sc_debug.debugfs_root = debugfs_create_dir(KBUILD_MODNAME, NULL);

            
            	if (!sc->sc_debug.debugfs_root)

            
            		goto err;


            	sc->sc_debug.debugfs_phy = debugfs_create_dir(wiphy_name(sc->hw->wiphy),

            
            						      sc->sc_debug.debugfs_root);

            
            	if (!sc->sc_debug.debugfs_phy)

            
            		goto err;


            	sc->sc_debug.debugfs_dma = debugfs_create_file("dma", S_IRUGO,

            
            				       sc->sc_debug.debugfs_phy, sc, &fops_dma);

            
            	if (!sc->sc_debug.debugfs_dma)

            
            		goto err;


            	sc->sc_debug.debugfs_interrupt = debugfs_create_file("interrupt",

            
            						     S_IRUGO,

            
            						     sc->sc_debug.debugfs_phy,

            
            						     sc, &fops_interrupt);

            
            	if (!sc->sc_debug.debugfs_interrupt)

            
            		goto err;


            	return 0;

            
            err:

            
            	ath9k_exit_debug(sc);

            
            	return -ENOMEM;

            
            }


            void ath9k_exit_debug(struct ath_softc *sc)

            
            {

            
            	debugfs_remove(sc->sc_debug.debugfs_interrupt);

            
            	debugfs_remove(sc->sc_debug.debugfs_dma);

            
            	debugfs_remove(sc->sc_debug.debugfs_phy);

            
            	debugfs_remove(sc->sc_debug.debugfs_root);

            
            }
	/*
	* Copyright (c) 2008 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 "core.h"
	#include "reg.h"
	#include "hw.h"

	static unsigned int ath9k_debug = DBG_DEFAULT;
	module_param_named(debug, ath9k_debug, uint, 0);

	void DPRINTF(struct ath_softc sc, int dbg_mask, const char fmt, ...)
	{
	if (!sc)
	return;

	if (sc->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_hal *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->sc_debug.stats.istats.total++;
	if (status & ATH9K_INT_RX)
	sc->sc_debug.stats.istats.rxok++;
	if (status & ATH9K_INT_RXEOL)
	sc->sc_debug.stats.istats.rxeol++;
	if (status & ATH9K_INT_RXORN)
	sc->sc_debug.stats.istats.rxorn++;
	if (status & ATH9K_INT_TX)
	sc->sc_debug.stats.istats.txok++;
	if (status & ATH9K_INT_TXURN)
	sc->sc_debug.stats.istats.txurn++;
	if (status & ATH9K_INT_MIB)
	sc->sc_debug.stats.istats.mib++;
	if (status & ATH9K_INT_RXPHY)
	sc->sc_debug.stats.istats.rxphyerr++;
	if (status & ATH9K_INT_RXKCM)
	sc->sc_debug.stats.istats.rx_keycache_miss++;
	if (status & ATH9K_INT_SWBA)
	sc->sc_debug.stats.istats.swba++;
	if (status & ATH9K_INT_BMISS)
	sc->sc_debug.stats.istats.bmiss++;
	if (status & ATH9K_INT_BNR)
	sc->sc_debug.stats.istats.bnr++;
	if (status & ATH9K_INT_CST)
	sc->sc_debug.stats.istats.cst++;
	if (status & ATH9K_INT_GTT)
	sc->sc_debug.stats.istats.gtt++;
	if (status & ATH9K_INT_TIM)
	sc->sc_debug.stats.istats.tim++;
	if (status & ATH9K_INT_CABEND)
	sc->sc_debug.stats.istats.cabend++;
	if (status & ATH9K_INT_DTIMSYNC)
	sc->sc_debug.stats.istats.dtimsync++;
	if (status & ATH9K_INT_DTIM)
	sc->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->sc_debug.stats.istats.rxok);
	len += snprintf(buf + len, sizeof(buf) - len,
	"%8s: %10u\n", "RXEOL", sc->sc_debug.stats.istats.rxeol);
	len += snprintf(buf + len, sizeof(buf) - len,
	"%8s: %10u\n", "RXORN", sc->sc_debug.stats.istats.rxorn);
	len += snprintf(buf + len, sizeof(buf) - len,
	"%8s: %10u\n", "TX", sc->sc_debug.stats.istats.txok);
	len += snprintf(buf + len, sizeof(buf) - len,
	"%8s: %10u\n", "TXURN", sc->sc_debug.stats.istats.txurn);
	len += snprintf(buf + len, sizeof(buf) - len,
	"%8s: %10u\n", "MIB", sc->sc_debug.stats.istats.mib);
	len += snprintf(buf + len, sizeof(buf) - len,
	"%8s: %10u\n", "RXPHY", sc->sc_debug.stats.istats.rxphyerr);
	len += snprintf(buf + len, sizeof(buf) - len,
	"%8s: %10u\n", "RXKCM", sc->sc_debug.stats.istats.rx_keycache_miss);
	len += snprintf(buf + len, sizeof(buf) - len,
	"%8s: %10u\n", "SWBA", sc->sc_debug.stats.istats.swba);
	len += snprintf(buf + len, sizeof(buf) - len,
	"%8s: %10u\n", "BMISS", sc->sc_debug.stats.istats.bmiss);
	len += snprintf(buf + len, sizeof(buf) - len,
	"%8s: %10u\n", "BNR", sc->sc_debug.stats.istats.bnr);
	len += snprintf(buf + len, sizeof(buf) - len,
	"%8s: %10u\n", "CST", sc->sc_debug.stats.istats.cst);
	len += snprintf(buf + len, sizeof(buf) - len,
	"%8s: %10u\n", "GTT", sc->sc_debug.stats.istats.gtt);
	len += snprintf(buf + len, sizeof(buf) - len,
	"%8s: %10u\n", "TIM", sc->sc_debug.stats.istats.tim);
	len += snprintf(buf + len, sizeof(buf) - len,
	"%8s: %10u\n", "CABEND", sc->sc_debug.stats.istats.cabend);
	len += snprintf(buf + len, sizeof(buf) - len,
	"%8s: %10u\n", "DTIMSYNC", sc->sc_debug.stats.istats.dtimsync);
	len += snprintf(buf + len, sizeof(buf) - len,
	"%8s: %10u\n", "DTIM", sc->sc_debug.stats.istats.dtim);
	len += snprintf(buf + len, sizeof(buf) - len,
	"%8s: %10u\n", "TOTAL", sc->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
	};

	int ath9k_init_debug(struct ath_softc *sc)
	{
	sc->sc_debug.debug_mask = ath9k_debug;

	sc->sc_debug.debugfs_root = debugfs_create_dir(KBUILD_MODNAME, NULL);
	if (!sc->sc_debug.debugfs_root)
	goto err;

	sc->sc_debug.debugfs_phy = debugfs_create_dir(wiphy_name(sc->hw->wiphy),
	sc->sc_debug.debugfs_root);
	if (!sc->sc_debug.debugfs_phy)
	goto err;

	sc->sc_debug.debugfs_dma = debugfs_create_file("dma", S_IRUGO,
	sc->sc_debug.debugfs_phy, sc, &fops_dma);
	if (!sc->sc_debug.debugfs_dma)
	goto err;

	sc->sc_debug.debugfs_interrupt = debugfs_create_file("interrupt",
	S_IRUGO,
	sc->sc_debug.debugfs_phy,
	sc, &fops_interrupt);
	if (!sc->sc_debug.debugfs_interrupt)
	goto err;

	return 0;
	err:
	ath9k_exit_debug(sc);
	return -ENOMEM;
	}

	void ath9k_exit_debug(struct ath_softc *sc)
	{
	debugfs_remove(sc->sc_debug.debugfs_interrupt);
	debugfs_remove(sc->sc_debug.debugfs_dma);
	debugfs_remove(sc->sc_debug.debugfs_phy);
	debugfs_remove(sc->sc_debug.debugfs_root);
	}