/*
 * Copyright (c) 2007-2008 Bruno Randolf <bruno@thinktube.com>
 *
 *  This file is free software: you may copy, redistribute and/or modify it
 *  under the terms of the GNU General Public License as published by the
 *  Free Software Foundation, either version 2 of the License, or (at your
 *  option) any later version.
 *
 *  This file is distributed in the hope that it will be useful, but
 *  WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 *  General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 *
 * This file incorporates work covered by the following copyright and
 * permission notice:
 *
 * Copyright (c) 2002-2005 Sam Leffler, Errno Consulting
 * Copyright (c) 2004-2005 Atheros Communications, Inc.
 * Copyright (c) 2006 Devicescape Software, Inc.
 * Copyright (c) 2007 Jiri Slaby <jirislaby@gmail.com>
 * Copyright (c) 2007 Luis R. Rodriguez <mcgrof@winlab.rutgers.edu>
 *
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer,
 *    without modification.
 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
 *    similar to the "NO WARRANTY" disclaimer below ("Disclaimer") and any
 *    redistribution must be conditioned upon including a substantially
 *    similar Disclaimer requirement for further binary redistribution.
 * 3. Neither the names of the above-listed copyright holders nor the names
 *    of any contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * Alternatively, this software may be distributed under the terms of the
 * GNU General Public License ("GPL") version 2 as published by the Free
 * Software Foundation.
 *
 * NO WARRANTY
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF NONINFRINGEMENT, MERCHANTIBILITY
 * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
 * THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY,
 * OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
 * IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
 * THE POSSIBILITY OF SUCH DAMAGES.
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/export.h>
#include <linux/moduleparam.h>
#include <linux/vmalloc.h>

#include <linux/seq_file.h>
#include <linux/list.h>
#include "debug.h"
#include "ath5k.h"
#include "reg.h"
#include "base.h"

static unsigned int ath5k_debug;
module_param_named(debug, ath5k_debug, uint, 0);


/* debugfs: registers */

struct reg {
        const char *name;
        int addr;
};

#define REG_STRUCT_INIT(r) { #r, r }

/* just a few random registers, might want to add more */
static const struct reg regs[] = {
        REG_STRUCT_INIT(AR5K_CR),
        REG_STRUCT_INIT(AR5K_RXDP),
        REG_STRUCT_INIT(AR5K_CFG),
        REG_STRUCT_INIT(AR5K_IER),
        REG_STRUCT_INIT(AR5K_BCR),
        REG_STRUCT_INIT(AR5K_RTSD0),
        REG_STRUCT_INIT(AR5K_RTSD1),
        REG_STRUCT_INIT(AR5K_TXCFG),
        REG_STRUCT_INIT(AR5K_RXCFG),
        REG_STRUCT_INIT(AR5K_RXJLA),
        REG_STRUCT_INIT(AR5K_MIBC),
        REG_STRUCT_INIT(AR5K_TOPS),
        REG_STRUCT_INIT(AR5K_RXNOFRM),
        REG_STRUCT_INIT(AR5K_TXNOFRM),
        REG_STRUCT_INIT(AR5K_RPGTO),
        REG_STRUCT_INIT(AR5K_RFCNT),
        REG_STRUCT_INIT(AR5K_MISC),
        REG_STRUCT_INIT(AR5K_QCUDCU_CLKGT),
        REG_STRUCT_INIT(AR5K_ISR),
        REG_STRUCT_INIT(AR5K_PISR),
        REG_STRUCT_INIT(AR5K_SISR0),
        REG_STRUCT_INIT(AR5K_SISR1),
        REG_STRUCT_INIT(AR5K_SISR2),
        REG_STRUCT_INIT(AR5K_SISR3),
        REG_STRUCT_INIT(AR5K_SISR4),
        REG_STRUCT_INIT(AR5K_IMR),
        REG_STRUCT_INIT(AR5K_PIMR),
        REG_STRUCT_INIT(AR5K_SIMR0),
        REG_STRUCT_INIT(AR5K_SIMR1),
        REG_STRUCT_INIT(AR5K_SIMR2),
        REG_STRUCT_INIT(AR5K_SIMR3),
        REG_STRUCT_INIT(AR5K_SIMR4),
        REG_STRUCT_INIT(AR5K_DCM_ADDR),
        REG_STRUCT_INIT(AR5K_DCCFG),
        REG_STRUCT_INIT(AR5K_CCFG),
        REG_STRUCT_INIT(AR5K_CPC0),
        REG_STRUCT_INIT(AR5K_CPC1),
        REG_STRUCT_INIT(AR5K_CPC2),
        REG_STRUCT_INIT(AR5K_CPC3),
        REG_STRUCT_INIT(AR5K_CPCOVF),
        REG_STRUCT_INIT(AR5K_RESET_CTL),
        REG_STRUCT_INIT(AR5K_SLEEP_CTL),
        REG_STRUCT_INIT(AR5K_INTPEND),
        REG_STRUCT_INIT(AR5K_SFR),
        REG_STRUCT_INIT(AR5K_PCICFG),
        REG_STRUCT_INIT(AR5K_GPIOCR),
        REG_STRUCT_INIT(AR5K_GPIODO),
        REG_STRUCT_INIT(AR5K_SREV),
};

static void *reg_start(struct seq_file *seq, loff_t *pos)
{
        return *pos < ARRAY_SIZE(regs) ? (void *)&regs[*pos] : NULL;
}

static void reg_stop(struct seq_file *seq, void *p)
{
        /* nothing to do */
}

static void *reg_next(struct seq_file *seq, void *p, loff_t *pos)
{
        ++*pos;
        return *pos < ARRAY_SIZE(regs) ? (void *)&regs[*pos] : NULL;
}

static int reg_show(struct seq_file *seq, void *p)
{
        struct ath5k_hw *ah = seq->private;
        struct reg *r = p;
        seq_printf(seq, "%-25s0x%08x\n", r->name,
                ath5k_hw_reg_read(ah, r->addr));
        return 0;
}

static const struct seq_operations register_seq_ops = {
        .start = reg_start,
        .next  = reg_next,
        .stop  = reg_stop,
        .show  = reg_show
};

static int open_file_registers(struct inode *inode, struct file *file)
{
        struct seq_file *s;
        int res;
        res = seq_open(file, &register_seq_ops);
        if (res == 0) {
                s = file->private_data;
                s->private = inode->i_private;
        }
        return res;
}

static const struct file_operations fops_registers = {
        .open = open_file_registers,
        .read    = seq_read,
        .llseek  = seq_lseek,
        .release = seq_release,
        .owner = THIS_MODULE,
};


/* debugfs: beacons */

static ssize_t read_file_beacon(struct file *file, char __user *user_buf,
                                   size_t count, loff_t *ppos)
{
        struct ath5k_hw *ah = file->private_data;
        char buf[500];
        unsigned int len = 0;
        unsigned int v;
        u64 tsf;

        v = ath5k_hw_reg_read(ah, AR5K_BEACON);
        len += snprintf(buf + len, sizeof(buf) - len,
                "%-24s0x%08x\tintval: %d\tTIM: 0x%x\n",
                "AR5K_BEACON", v, v & AR5K_BEACON_PERIOD,
                (v & AR5K_BEACON_TIM) >> AR5K_BEACON_TIM_S);

        len += snprintf(buf + len, sizeof(buf) - len, "%-24s0x%08x\n",
                "AR5K_LAST_TSTP", ath5k_hw_reg_read(ah, AR5K_LAST_TSTP));

        len += snprintf(buf + len, sizeof(buf) - len, "%-24s0x%08x\n\n",
                "AR5K_BEACON_CNT", ath5k_hw_reg_read(ah, AR5K_BEACON_CNT));

        v = ath5k_hw_reg_read(ah, AR5K_TIMER0);
        len += snprintf(buf + len, sizeof(buf) - len, "%-24s0x%08x\tTU: %08x\n",
                "AR5K_TIMER0 (TBTT)", v, v);

        v = ath5k_hw_reg_read(ah, AR5K_TIMER1);
        len += snprintf(buf + len, sizeof(buf) - len, "%-24s0x%08x\tTU: %08x\n",
                "AR5K_TIMER1 (DMA)", v, v >> 3);

        v = ath5k_hw_reg_read(ah, AR5K_TIMER2);
        len += snprintf(buf + len, sizeof(buf) - len, "%-24s0x%08x\tTU: %08x\n",
                "AR5K_TIMER2 (SWBA)", v, v >> 3);

        v = ath5k_hw_reg_read(ah, AR5K_TIMER3);
        len += snprintf(buf + len, sizeof(buf) - len, "%-24s0x%08x\tTU: %08x\n",
                "AR5K_TIMER3 (ATIM)", v, v);

        tsf = ath5k_hw_get_tsf64(ah);
        len += snprintf(buf + len, sizeof(buf) - len,
                "TSF\t\t0x%016llx\tTU: %08x\n",
                (unsigned long long)tsf, TSF_TO_TU(tsf));

        if (len > sizeof(buf))
                len = sizeof(buf);

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

static ssize_t write_file_beacon(struct file *file,
                                 const char __user *userbuf,
                                 size_t count, loff_t *ppos)
{
        struct ath5k_hw *ah = file->private_data;
        char buf[20];

        count = min_t(size_t, count, sizeof(buf) - 1);
        if (copy_from_user(buf, userbuf, count))
                return -EFAULT;

        buf[count] = '\0';
        if (strncmp(buf, "disable", 7) == 0) {
                AR5K_REG_DISABLE_BITS(ah, AR5K_BEACON, AR5K_BEACON_ENABLE);
                pr_info("debugfs disable beacons\n");
        } else if (strncmp(buf, "enable", 6) == 0) {
                AR5K_REG_ENABLE_BITS(ah, AR5K_BEACON, AR5K_BEACON_ENABLE);
                pr_info("debugfs enable beacons\n");
        }
        return count;
}

static const struct file_operations fops_beacon = {
        .read = read_file_beacon,
        .write = write_file_beacon,
        .open = simple_open,
        .owner = THIS_MODULE,
        .llseek = default_llseek,
};


/* debugfs: reset */

static ssize_t write_file_reset(struct file *file,
                                 const char __user *userbuf,
                                 size_t count, loff_t *ppos)
{
        struct ath5k_hw *ah = file->private_data;
        ATH5K_DBG(ah, ATH5K_DEBUG_RESET, "debug file triggered reset\n");
        ieee80211_queue_work(ah->hw, &ah->reset_work);
        return count;
}

static const struct file_operations fops_reset = {
        .write = write_file_reset,
        .open = simple_open,
        .owner = THIS_MODULE,
        .llseek = noop_llseek,
};


/* debugfs: debug level */

static const struct {
        enum ath5k_debug_level level;
        const char *name;
        const char *desc;
} dbg_info[] = {
        { ATH5K_DEBUG_RESET,    "reset",        "reset and initialization" },
        { ATH5K_DEBUG_INTR,     "intr",         "interrupt handling" },
        { ATH5K_DEBUG_MODE,     "mode",         "mode init/setup" },
        { ATH5K_DEBUG_XMIT,     "xmit",         "basic xmit operation" },
        { ATH5K_DEBUG_BEACON,   "beacon",       "beacon handling" },
        { ATH5K_DEBUG_CALIBRATE, "calib",       "periodic calibration" },
        { ATH5K_DEBUG_TXPOWER,  "txpower",      "transmit power setting" },
        { ATH5K_DEBUG_LED,      "led",          "LED management" },
        { ATH5K_DEBUG_DUMPBANDS, "dumpbands",   "dump bands" },
        { ATH5K_DEBUG_DMA,      "dma",          "dma start/stop" },
        { ATH5K_DEBUG_ANI,      "ani",          "adaptive noise immunity" },
        { ATH5K_DEBUG_DESC,     "desc",         "descriptor chains" },
        { ATH5K_DEBUG_ANY,      "all",          "show all debug levels" },
};

static ssize_t read_file_debug(struct file *file, char __user *user_buf,
                                   size_t count, loff_t *ppos)
{
        struct ath5k_hw *ah = file->private_data;
        char buf[700];
        unsigned int len = 0;
        unsigned int i;

        len += snprintf(buf + len, sizeof(buf) - len,
                "DEBUG LEVEL: 0x%08x\n\n", ah->debug.level);

        for (i = 0; i < ARRAY_SIZE(dbg_info) - 1; i++) {
                len += snprintf(buf + len, sizeof(buf) - len,
                        "%10s %c 0x%08x - %s\n", dbg_info[i].name,
                        ah->debug.level & dbg_info[i].level ? '+' : ' ',
                        dbg_info[i].level, dbg_info[i].desc);
        }
        len += snprintf(buf + len, sizeof(buf) - len,
                "%10s %c 0x%08x - %s\n", dbg_info[i].name,
                ah->debug.level == dbg_info[i].level ? '+' : ' ',
                dbg_info[i].level, dbg_info[i].desc);

        if (len > sizeof(buf))
                len = sizeof(buf);

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

static ssize_t write_file_debug(struct file *file,
                                 const char __user *userbuf,
                                 size_t count, loff_t *ppos)
{
        struct ath5k_hw *ah = file->private_data;
        unsigned int i;
        char buf[20];

        count = min_t(size_t, count, sizeof(buf) - 1);
        if (copy_from_user(buf, userbuf, count))
                return -EFAULT;

        buf[count] = '\0';
        for (i = 0; i < ARRAY_SIZE(dbg_info); i++) {
                if (strncmp(buf, dbg_info[i].name,
                                        strlen(dbg_info[i].name)) == 0) {
                        ah->debug.level ^= dbg_info[i].level; /* toggle bit */
                        break;
                }
        }
        return count;
}

static const struct file_operations fops_debug = {
        .read = read_file_debug,
        .write = write_file_debug,
        .open = simple_open,
        .owner = THIS_MODULE,
        .llseek = default_llseek,
};


/* debugfs: antenna */

static ssize_t read_file_antenna(struct file *file, char __user *user_buf,
                                   size_t count, loff_t *ppos)
{
        struct ath5k_hw *ah = file->private_data;
        char buf[700];
        unsigned int len = 0;
        unsigned int i;
        unsigned int v;

        len += snprintf(buf + len, sizeof(buf) - len, "antenna mode\t%d\n",
                ah->ah_ant_mode);
        len += snprintf(buf + len, sizeof(buf) - len, "default antenna\t%d\n",
                ah->ah_def_ant);
        len += snprintf(buf + len, sizeof(buf) - len, "tx antenna\t%d\n",
                ah->ah_tx_ant);

        len += snprintf(buf + len, sizeof(buf) - len, "\nANTENNA\t\tRX\tTX\n");
        for (i = 1; i < ARRAY_SIZE(ah->stats.antenna_rx); i++) {
                len += snprintf(buf + len, sizeof(buf) - len,
                        "[antenna %d]\t%d\t%d\n",
                        i, ah->stats.antenna_rx[i], ah->stats.antenna_tx[i]);
        }
        len += snprintf(buf + len, sizeof(buf) - len, "[invalid]\t%d\t%d\n",
                        ah->stats.antenna_rx[0], ah->stats.antenna_tx[0]);

        v = ath5k_hw_reg_read(ah, AR5K_DEFAULT_ANTENNA);
        len += snprintf(buf + len, sizeof(buf) - len,
                        "\nAR5K_DEFAULT_ANTENNA\t0x%08x\n", v);

        v = ath5k_hw_reg_read(ah, AR5K_STA_ID1);
        len += snprintf(buf + len, sizeof(buf) - len,
                "AR5K_STA_ID1_DEFAULT_ANTENNA\t%d\n",
                (v & AR5K_STA_ID1_DEFAULT_ANTENNA) != 0);
        len += snprintf(buf + len, sizeof(buf) - len,
                "AR5K_STA_ID1_DESC_ANTENNA\t%d\n",
                (v & AR5K_STA_ID1_DESC_ANTENNA) != 0);
        len += snprintf(buf + len, sizeof(buf) - len,
                "AR5K_STA_ID1_RTS_DEF_ANTENNA\t%d\n",
                (v & AR5K_STA_ID1_RTS_DEF_ANTENNA) != 0);
        len += snprintf(buf + len, sizeof(buf) - len,
                "AR5K_STA_ID1_SELFGEN_DEF_ANT\t%d\n",
                (v & AR5K_STA_ID1_SELFGEN_DEF_ANT) != 0);

        v = ath5k_hw_reg_read(ah, AR5K_PHY_AGCCTL);
        len += snprintf(buf + len, sizeof(buf) - len,
                "\nAR5K_PHY_AGCCTL_OFDM_DIV_DIS\t%d\n",
                (v & AR5K_PHY_AGCCTL_OFDM_DIV_DIS) != 0);

        v = ath5k_hw_reg_read(ah, AR5K_PHY_RESTART);
        len += snprintf(buf + len, sizeof(buf) - len,
                "AR5K_PHY_RESTART_DIV_GC\t\t%x\n",
                (v & AR5K_PHY_RESTART_DIV_GC) >> AR5K_PHY_RESTART_DIV_GC_S);

        v = ath5k_hw_reg_read(ah, AR5K_PHY_FAST_ANT_DIV);
        len += snprintf(buf + len, sizeof(buf) - len,
                "AR5K_PHY_FAST_ANT_DIV_EN\t%d\n",
                (v & AR5K_PHY_FAST_ANT_DIV_EN) != 0);

        v = ath5k_hw_reg_read(ah, AR5K_PHY_ANT_SWITCH_TABLE_0);
        len += snprintf(buf + len, sizeof(buf) - len,
                        "\nAR5K_PHY_ANT_SWITCH_TABLE_0\t0x%08x\n", v);
        v = ath5k_hw_reg_read(ah, AR5K_PHY_ANT_SWITCH_TABLE_1);
        len += snprintf(buf + len, sizeof(buf) - len,
                        "AR5K_PHY_ANT_SWITCH_TABLE_1\t0x%08x\n", v);

        if (len > sizeof(buf))
                len = sizeof(buf);

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

static ssize_t write_file_antenna(struct file *file,
                                 const char __user *userbuf,
                                 size_t count, loff_t *ppos)
{
        struct ath5k_hw *ah = file->private_data;
        unsigned int i;
        char buf[20];

        count = min_t(size_t, count, sizeof(buf) - 1);
        if (copy_from_user(buf, userbuf, count))
                return -EFAULT;

        buf[count] = '\0';
        if (strncmp(buf, "diversity", 9) == 0) {
                ath5k_hw_set_antenna_mode(ah, AR5K_ANTMODE_DEFAULT);
                pr_info("debug: enable diversity\n");
        } else if (strncmp(buf, "fixed-a", 7) == 0) {
                ath5k_hw_set_antenna_mode(ah, AR5K_ANTMODE_FIXED_A);
                pr_info("debug: fixed antenna A\n");
        } else if (strncmp(buf, "fixed-b", 7) == 0) {
                ath5k_hw_set_antenna_mode(ah, AR5K_ANTMODE_FIXED_B);
                pr_info("debug: fixed antenna B\n");
        } else if (strncmp(buf, "clear", 5) == 0) {
                for (i = 0; i < ARRAY_SIZE(ah->stats.antenna_rx); i++) {
                        ah->stats.antenna_rx[i] = 0;
                        ah->stats.antenna_tx[i] = 0;
                }
                pr_info("debug: cleared antenna stats\n");
        }
        return count;
}

static const struct file_operations fops_antenna = {
        .read = read_file_antenna,
        .write = write_file_antenna,
        .open = simple_open,
        .owner = THIS_MODULE,
        .llseek = default_llseek,
};

/* debugfs: misc */

static ssize_t read_file_misc(struct file *file, char __user *user_buf,
                                   size_t count, loff_t *ppos)
{
        struct ath5k_hw *ah = file->private_data;
        char buf[700];
        unsigned int len = 0;
        u32 filt = ath5k_hw_get_rx_filter(ah);

        len += snprintf(buf + len, sizeof(buf) - len, "bssid-mask: %pM\n",
                        ah->bssidmask);
        len += snprintf(buf + len, sizeof(buf) - len, "filter-flags: 0x%x ",
                        filt);
        if (filt & AR5K_RX_FILTER_UCAST)
                len += snprintf(buf + len, sizeof(buf) - len, " UCAST");
        if (filt & AR5K_RX_FILTER_MCAST)
                len += snprintf(buf + len, sizeof(buf) - len, " MCAST");
        if (filt & AR5K_RX_FILTER_BCAST)
                len += snprintf(buf + len, sizeof(buf) - len, " BCAST");
        if (filt & AR5K_RX_FILTER_CONTROL)
                len += snprintf(buf + len, sizeof(buf) - len, " CONTROL");
        if (filt & AR5K_RX_FILTER_BEACON)
                len += snprintf(buf + len, sizeof(buf) - len, " BEACON");
        if (filt & AR5K_RX_FILTER_PROM)
                len += snprintf(buf + len, sizeof(buf) - len, " PROM");
        if (filt & AR5K_RX_FILTER_XRPOLL)
                len += snprintf(buf + len, sizeof(buf) - len, " XRPOLL");
        if (filt & AR5K_RX_FILTER_PROBEREQ)
                len += snprintf(buf + len, sizeof(buf) - len, " PROBEREQ");
        if (filt & AR5K_RX_FILTER_PHYERR_5212)
                len += snprintf(buf + len, sizeof(buf) - len, " PHYERR-5212");
        if (filt & AR5K_RX_FILTER_RADARERR_5212)
                len += snprintf(buf + len, sizeof(buf) - len, " RADARERR-5212");
        if (filt & AR5K_RX_FILTER_PHYERR_5211)
                snprintf(buf + len, sizeof(buf) - len, " PHYERR-5211");
        if (filt & AR5K_RX_FILTER_RADARERR_5211)
                len += snprintf(buf + len, sizeof(buf) - len, " RADARERR-5211");

        len += snprintf(buf + len, sizeof(buf) - len, "\nopmode: %s (%d)\n",
                        ath_opmode_to_string(ah->opmode), ah->opmode);

        if (len > sizeof(buf))
                len = sizeof(buf);

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

static const struct file_operations fops_misc = {
        .read = read_file_misc,
        .open = simple_open,
        .owner = THIS_MODULE,
};


/* debugfs: frameerrors */

static ssize_t read_file_frameerrors(struct file *file, char __user *user_buf,
                                   size_t count, loff_t *ppos)
{
        struct ath5k_hw *ah = file->private_data;
        struct ath5k_statistics *st = &ah->stats;
        char buf[700];
        unsigned int len = 0;
        int i;

        len += snprintf(buf + len, sizeof(buf) - len,
                        "RX\n---------------------\n");
        len += snprintf(buf + len, sizeof(buf) - len, "CRC\t%u\t(%u%%)\n",
                        st->rxerr_crc,
                        st->rx_all_count > 0 ?
                                st->rxerr_crc * 100 / st->rx_all_count : 0);
        len += snprintf(buf + len, sizeof(buf) - len, "PHY\t%u\t(%u%%)\n",
                        st->rxerr_phy,
                        st->rx_all_count > 0 ?
                                st->rxerr_phy * 100 / st->rx_all_count : 0);
        for (i = 0; i < 32; i++) {
                if (st->rxerr_phy_code[i])
                        len += snprintf(buf + len, sizeof(buf) - len,
                                " phy_err[%u]\t%u\n",
                                i, st->rxerr_phy_code[i]);
        }

        len += snprintf(buf + len, sizeof(buf) - len, "FIFO\t%u\t(%u%%)\n",
                        st->rxerr_fifo,
                        st->rx_all_count > 0 ?
                                st->rxerr_fifo * 100 / st->rx_all_count : 0);
        len += snprintf(buf + len, sizeof(buf) - len, "decrypt\t%u\t(%u%%)\n",
                        st->rxerr_decrypt,
                        st->rx_all_count > 0 ?
                                st->rxerr_decrypt * 100 / st->rx_all_count : 0);
        len += snprintf(buf + len, sizeof(buf) - len, "MIC\t%u\t(%u%%)\n",
                        st->rxerr_mic,
                        st->rx_all_count > 0 ?
                                st->rxerr_mic * 100 / st->rx_all_count : 0);
        len += snprintf(buf + len, sizeof(buf) - len, "process\t%u\t(%u%%)\n",
                        st->rxerr_proc,
                        st->rx_all_count > 0 ?
                                st->rxerr_proc * 100 / st->rx_all_count : 0);
        len += snprintf(buf + len, sizeof(buf) - len, "jumbo\t%u\t(%u%%)\n",
                        st->rxerr_jumbo,
                        st->rx_all_count > 0 ?
                                st->rxerr_jumbo * 100 / st->rx_all_count : 0);
        len += snprintf(buf + len, sizeof(buf) - len, "[RX all\t%u]\n",
                        st->rx_all_count);
        len += snprintf(buf + len, sizeof(buf) - len, "RX-all-bytes\t%u\n",
                        st->rx_bytes_count);

        len += snprintf(buf + len, sizeof(buf) - len,
                        "\nTX\n---------------------\n");
        len += snprintf(buf + len, sizeof(buf) - len, "retry\t%u\t(%u%%)\n",
                        st->txerr_retry,
                        st->tx_all_count > 0 ?
                                st->txerr_retry * 100 / st->tx_all_count : 0);
        len += snprintf(buf + len, sizeof(buf) - len, "FIFO\t%u\t(%u%%)\n",
                        st->txerr_fifo,
                        st->tx_all_count > 0 ?
                                st->txerr_fifo * 100 / st->tx_all_count : 0);
        len += snprintf(buf + len, sizeof(buf) - len, "filter\t%u\t(%u%%)\n",
                        st->txerr_filt,
                        st->tx_all_count > 0 ?
                                st->txerr_filt * 100 / st->tx_all_count : 0);
        len += snprintf(buf + len, sizeof(buf) - len, "[TX all\t%u]\n",
                        st->tx_all_count);
        len += snprintf(buf + len, sizeof(buf) - len, "TX-all-bytes\t%u\n",
                        st->tx_bytes_count);

        if (len > sizeof(buf))
                len = sizeof(buf);

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

static ssize_t write_file_frameerrors(struct file *file,
                                 const char __user *userbuf,
                                 size_t count, loff_t *ppos)
{
        struct ath5k_hw *ah = file->private_data;
        struct ath5k_statistics *st = &ah->stats;
        char buf[20];

        count = min_t(size_t, count, sizeof(buf) - 1);
        if (copy_from_user(buf, userbuf, count))
                return -EFAULT;

        buf[count] = '\0';
        if (strncmp(buf, "clear", 5) == 0) {
                st->rxerr_crc = 0;
                st->rxerr_phy = 0;
                st->rxerr_fifo = 0;
                st->rxerr_decrypt = 0;
                st->rxerr_mic = 0;
                st->rxerr_proc = 0;
                st->rxerr_jumbo = 0;
                st->rx_all_count = 0;
                st->txerr_retry = 0;
                st->txerr_fifo = 0;
                st->txerr_filt = 0;
                st->tx_all_count = 0;
                pr_info("debug: cleared frameerrors stats\n");
        }
        return count;
}

static const struct file_operations fops_frameerrors = {
        .read = read_file_frameerrors,
        .write = write_file_frameerrors,
        .open = simple_open,
        .owner = THIS_MODULE,
        .llseek = default_llseek,
};


/* debugfs: ani */

static ssize_t read_file_ani(struct file *file, char __user *user_buf,
                                   size_t count, loff_t *ppos)
{
        struct ath5k_hw *ah = file->private_data;
        struct ath5k_statistics *st = &ah->stats;
        struct ath5k_ani_state *as = &ah->ani_state;

        char buf[700];
        unsigned int len = 0;

        len += snprintf(buf + len, sizeof(buf) - len,
                        "HW has PHY error counters:\t%s\n",
                        ah->ah_capabilities.cap_has_phyerr_counters ?
                        "yes" : "no");
        len += snprintf(buf + len, sizeof(buf) - len,
                        "HW max spur immunity level:\t%d\n",
                        as->max_spur_level);
        len += snprintf(buf + len, sizeof(buf) - len,
                "\nANI state\n--------------------------------------------\n");
        len += snprintf(buf + len, sizeof(buf) - len, "operating mode:\t\t\t");
        switch (as->ani_mode) {
        case ATH5K_ANI_MODE_OFF:
                len += snprintf(buf + len, sizeof(buf) - len, "OFF\n");
                break;
        case ATH5K_ANI_MODE_MANUAL_LOW:
                len += snprintf(buf + len, sizeof(buf) - len,
                        "MANUAL LOW\n");
                break;
        case ATH5K_ANI_MODE_MANUAL_HIGH:
                len += snprintf(buf + len, sizeof(buf) - len,
                        "MANUAL HIGH\n");
                break;
        case ATH5K_ANI_MODE_AUTO:
                len += snprintf(buf + len, sizeof(buf) - len, "AUTO\n");
                break;
        default:
                len += snprintf(buf + len, sizeof(buf) - len,
                        "??? (not good)\n");
                break;
        }
        len += snprintf(buf + len, sizeof(buf) - len,
                        "noise immunity level:\t\t%d\n",
                        as->noise_imm_level);
        len += snprintf(buf + len, sizeof(buf) - len,
                        "spur immunity level:\t\t%d\n",
                        as->spur_level);
        len += snprintf(buf + len, sizeof(buf) - len,
                        "firstep level:\t\t\t%d\n",
                        as->firstep_level);
        len += snprintf(buf + len, sizeof(buf) - len,
                        "OFDM weak signal detection:\t%s\n",
                        as->ofdm_weak_sig ? "on" : "off");
        len += snprintf(buf + len, sizeof(buf) - len,
                        "CCK weak signal detection:\t%s\n",
                        as->cck_weak_sig ? "on" : "off");

        len += snprintf(buf + len, sizeof(buf) - len,
                        "\nMIB INTERRUPTS:\t\t%u\n",
                        st->mib_intr);
        len += snprintf(buf + len, sizeof(buf) - len,
                        "beacon RSSI average:\t%d\n",
                        (int)ewma_beacon_rssi_read(&ah->ah_beacon_rssi_avg));

#define CC_PRINT(_struct, _field) \
        _struct._field, \
        _struct.cycles > 0 ? \
        _struct._field * 100 / _struct.cycles : 0

        len += snprintf(buf + len, sizeof(buf) - len,
                        "profcnt tx\t\t%u\t(%d%%)\n",
                        CC_PRINT(as->last_cc, tx_frame));
        len += snprintf(buf + len, sizeof(buf) - len,
                        "profcnt rx\t\t%u\t(%d%%)\n",
                        CC_PRINT(as->last_cc, rx_frame));
        len += snprintf(buf + len, sizeof(buf) - len,
                        "profcnt busy\t\t%u\t(%d%%)\n",
                        CC_PRINT(as->last_cc, rx_busy));
#undef CC_PRINT
        len += snprintf(buf + len, sizeof(buf) - len, "profcnt cycles\t\t%u\n",
                        as->last_cc.cycles);
        len += snprintf(buf + len, sizeof(buf) - len,
                        "listen time\t\t%d\tlast: %d\n",
                        as->listen_time, as->last_listen);
        len += snprintf(buf + len, sizeof(buf) - len,
                        "OFDM errors\t\t%u\tlast: %u\tsum: %u\n",
                        as->ofdm_errors, as->last_ofdm_errors,
                        as->sum_ofdm_errors);
        len += snprintf(buf + len, sizeof(buf) - len,
                        "CCK errors\t\t%u\tlast: %u\tsum: %u\n",
                        as->cck_errors, as->last_cck_errors,
                        as->sum_cck_errors);
        len += snprintf(buf + len, sizeof(buf) - len,
                        "AR5K_PHYERR_CNT1\t%x\t(=%d)\n",
                        ath5k_hw_reg_read(ah, AR5K_PHYERR_CNT1),
                        ATH5K_ANI_OFDM_TRIG_HIGH - (ATH5K_PHYERR_CNT_MAX -
                        ath5k_hw_reg_read(ah, AR5K_PHYERR_CNT1)));
        len += snprintf(buf + len, sizeof(buf) - len,
                        "AR5K_PHYERR_CNT2\t%x\t(=%d)\n",
                        ath5k_hw_reg_read(ah, AR5K_PHYERR_CNT2),
                        ATH5K_ANI_CCK_TRIG_HIGH - (ATH5K_PHYERR_CNT_MAX -
                        ath5k_hw_reg_read(ah, AR5K_PHYERR_CNT2)));

        if (len > sizeof(buf))
                len = sizeof(buf);

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

static ssize_t write_file_ani(struct file *file,
                                 const char __user *userbuf,
                                 size_t count, loff_t *ppos)
{
        struct ath5k_hw *ah = file->private_data;
        char buf[20];

        count = min_t(size_t, count, sizeof(buf) - 1);
        if (copy_from_user(buf, userbuf, count))
                return -EFAULT;

        buf[count] = '\0';
        if (strncmp(buf, "sens-low", 8) == 0) {
                ath5k_ani_init(ah, ATH5K_ANI_MODE_MANUAL_HIGH);
        } else if (strncmp(buf, "sens-high", 9) == 0) {
                ath5k_ani_init(ah, ATH5K_ANI_MODE_MANUAL_LOW);
        } else if (strncmp(buf, "ani-off", 7) == 0) {
                ath5k_ani_init(ah, ATH5K_ANI_MODE_OFF);
        } else if (strncmp(buf, "ani-on", 6) == 0) {
                ath5k_ani_init(ah, ATH5K_ANI_MODE_AUTO);
        } else if (strncmp(buf, "noise-low", 9) == 0) {
                ath5k_ani_set_noise_immunity_level(ah, 0);
        } else if (strncmp(buf, "noise-high", 10) == 0) {
                ath5k_ani_set_noise_immunity_level(ah,
                                                   ATH5K_ANI_MAX_NOISE_IMM_LVL);
        } else if (strncmp(buf, "spur-low", 8) == 0) {
                ath5k_ani_set_spur_immunity_level(ah, 0);
        } else if (strncmp(buf, "spur-high", 9) == 0) {
                ath5k_ani_set_spur_immunity_level(ah,
                                                  ah->ani_state.max_spur_level);
        } else if (strncmp(buf, "fir-low", 7) == 0) {
                ath5k_ani_set_firstep_level(ah, 0);
        } else if (strncmp(buf, "fir-high", 8) == 0) {
                ath5k_ani_set_firstep_level(ah, ATH5K_ANI_MAX_FIRSTEP_LVL);
        } else if (strncmp(buf, "ofdm-off", 8) == 0) {
                ath5k_ani_set_ofdm_weak_signal_detection(ah, false);
        } else if (strncmp(buf, "ofdm-on", 7) == 0) {
                ath5k_ani_set_ofdm_weak_signal_detection(ah, true);
        } else if (strncmp(buf, "cck-off", 7) == 0) {
                ath5k_ani_set_cck_weak_signal_detection(ah, false);
        } else if (strncmp(buf, "cck-on", 6) == 0) {
                ath5k_ani_set_cck_weak_signal_detection(ah, true);
        }
        return count;
}

static const struct file_operations fops_ani = {
        .read = read_file_ani,
        .write = write_file_ani,
        .open = simple_open,
        .owner = THIS_MODULE,
        .llseek = default_llseek,
};


/* debugfs: queues etc */

static ssize_t read_file_queue(struct file *file, char __user *user_buf,
                                   size_t count, loff_t *ppos)
{
        struct ath5k_hw *ah = file->private_data;
        char buf[700];
        unsigned int len = 0;

        struct ath5k_txq *txq;
        struct ath5k_buf *bf, *bf0;
        int i, n;

        len += snprintf(buf + len, sizeof(buf) - len,
                        "available txbuffers: %d\n", ah->txbuf_len);

        for (i = 0; i < ARRAY_SIZE(ah->txqs); i++) {
                txq = &ah->txqs[i];

                len += snprintf(buf + len, sizeof(buf) - len,
                        "%02d: %ssetup\n", i, txq->setup ? "" : "not ");

                if (!txq->setup)
                        continue;

                n = 0;
                spin_lock_bh(&txq->lock);
                list_for_each_entry_safe(bf, bf0, &txq->q, list)
                        n++;
                spin_unlock_bh(&txq->lock);

                len += snprintf(buf + len, sizeof(buf) - len,
                                "  len: %d bufs: %d\n", txq->txq_len, n);
                len += snprintf(buf + len, sizeof(buf) - len,
                                "  stuck: %d\n", txq->txq_stuck);
        }

        if (len > sizeof(buf))
                len = sizeof(buf);

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

static ssize_t write_file_queue(struct file *file,
                                 const char __user *userbuf,
                                 size_t count, loff_t *ppos)
{
        struct ath5k_hw *ah = file->private_data;
        char buf[20];

        count = min_t(size_t, count, sizeof(buf) - 1);
        if (copy_from_user(buf, userbuf, count))
                return -EFAULT;

        buf[count] = '\0';
        if (strncmp(buf, "start", 5) == 0)
                ieee80211_wake_queues(ah->hw);
        else if (strncmp(buf, "stop", 4) == 0)
                ieee80211_stop_queues(ah->hw);

        return count;
}


static const struct file_operations fops_queue = {
        .read = read_file_queue,
        .write = write_file_queue,
        .open = simple_open,
        .owner = THIS_MODULE,
        .llseek = default_llseek,
};

/* debugfs: eeprom */

struct eeprom_private {
        u16 *buf;
        int len;
};

static int open_file_eeprom(struct inode *inode, struct file *file)
{
        struct eeprom_private *ep;
        struct ath5k_hw *ah = inode->i_private;
        bool res;
        int i, ret;
        u32 eesize;     /* NB: in 16-bit words */
        u16 val, *buf;

        /* Get eeprom size */

        res = ath5k_hw_nvram_read(ah, AR5K_EEPROM_SIZE_UPPER, &val);
        if (!res)
                return -EACCES;

        if (val == 0) {
                eesize = AR5K_EEPROM_INFO_MAX + AR5K_EEPROM_INFO_BASE;
        } else {
                eesize = (val & AR5K_EEPROM_SIZE_UPPER_MASK) <<
                        AR5K_EEPROM_SIZE_ENDLOC_SHIFT;
                ath5k_hw_nvram_read(ah, AR5K_EEPROM_SIZE_LOWER, &val);
                eesize = eesize | val;
        }

        if (eesize > 4096)
                return -EINVAL;

        /* Create buffer and read in eeprom */

        buf = vmalloc(array_size(eesize, 2));
        if (!buf) {
                ret = -ENOMEM;
                goto err;
        }

        for (i = 0; i < eesize; ++i) {
                if (!ath5k_hw_nvram_read(ah, i, &val)) {
                        ret = -EIO;
                        goto freebuf;
                }
                buf[i] = val;
        }

        /* Create private struct and assign to file */

        ep = kmalloc(sizeof(*ep), GFP_KERNEL);
        if (!ep) {
                ret = -ENOMEM;
                goto freebuf;
        }

        ep->buf = buf;
        ep->len = eesize * 2;

        file->private_data = (void *)ep;

        return 0;

freebuf:
        vfree(buf);
err:
        return ret;

}

static ssize_t read_file_eeprom(struct file *file, char __user *user_buf,
                                   size_t count, loff_t *ppos)
{
        struct eeprom_private *ep = file->private_data;

        return simple_read_from_buffer(user_buf, count, ppos, ep->buf, ep->len);
}

static int release_file_eeprom(struct inode *inode, struct file *file)
{
        struct eeprom_private *ep = file->private_data;

        vfree(ep->buf);
        kfree(ep);

        return 0;
}

static const struct file_operations fops_eeprom = {
        .open = open_file_eeprom,
        .read = read_file_eeprom,
        .release = release_file_eeprom,
        .owner = THIS_MODULE,
};


void
ath5k_debug_init_device(struct ath5k_hw *ah)
{
        struct dentry *phydir;

        ah->debug.level = ath5k_debug;

        phydir = debugfs_create_dir("ath5k", ah->hw->wiphy->debugfsdir);
        if (!phydir)
                return;

        debugfs_create_file("debug", 0600, phydir, ah, &fops_debug);
        debugfs_create_file("registers", 0400, phydir, ah, &fops_registers);
        debugfs_create_file("beacon", 0600, phydir, ah, &fops_beacon);
        debugfs_create_file("reset", 0200, phydir, ah, &fops_reset);
        debugfs_create_file("antenna", 0600, phydir, ah, &fops_antenna);
        debugfs_create_file("misc", 0400, phydir, ah, &fops_misc);
        debugfs_create_file("eeprom", 0400, phydir, ah, &fops_eeprom);
        debugfs_create_file("frameerrors", 0600, phydir, ah, &fops_frameerrors);
        debugfs_create_file("ani", 0600, phydir, ah, &fops_ani);
        debugfs_create_file("queue", 0600, phydir, ah, &fops_queue);
        debugfs_create_bool("32khz_clock", 0600, phydir,
                            &ah->ah_use_32khz_clock);
}

/* functions used in other places */

void
ath5k_debug_dump_bands(struct ath5k_hw *ah)
{
        unsigned int b, i;

        if (likely(!(ah->debug.level & ATH5K_DEBUG_DUMPBANDS)))
                return;

        for (b = 0; b < NUM_NL80211_BANDS; b++) {
                struct ieee80211_supported_band *band = &ah->sbands[b];
                char bname[6];
                switch (band->band) {
                case NL80211_BAND_2GHZ:
                        strcpy(bname, "2 GHz");
                        break;
                case NL80211_BAND_5GHZ:
                        strcpy(bname, "5 GHz");
                        break;
                default:
                        printk(KERN_DEBUG "Band not supported: %d\n",
                                band->band);
                        return;
                }
                printk(KERN_DEBUG "Band %s: channels %d, rates %d\n", bname,
                                band->n_channels, band->n_bitrates);
                printk(KERN_DEBUG " channels:\n");
                for (i = 0; i < band->n_channels; i++)
                        printk(KERN_DEBUG "  %3d %d %.4x %.4x\n",
                                        ieee80211_frequency_to_channel(
                                                band->channels[i].center_freq),
                                        band->channels[i].center_freq,
                                        band->channels[i].hw_value,
                                        band->channels[i].flags);
                printk(KERN_DEBUG " rates:\n");
                for (i = 0; i < band->n_bitrates; i++)
                        printk(KERN_DEBUG "  %4d %.4x %.4x %.4x\n",
                                        band->bitrates[i].bitrate,
                                        band->bitrates[i].hw_value,
                                        band->bitrates[i].flags,
                                        band->bitrates[i].hw_value_short);
        }
}

static inline void
ath5k_debug_printrxbuf(struct ath5k_buf *bf, int done,
                       struct ath5k_rx_status *rs)
{
        struct ath5k_desc *ds = bf->desc;
        struct ath5k_hw_all_rx_desc *rd = &ds->ud.ds_rx;

        printk(KERN_DEBUG "R (%p %llx) %08x %08x %08x %08x %08x %08x %c\n",
                ds, (unsigned long long)bf->daddr,
                ds->ds_link, ds->ds_data,
                rd->rx_ctl.rx_control_0, rd->rx_ctl.rx_control_1,
                rd->rx_stat.rx_status_0, rd->rx_stat.rx_status_1,
                !done ? ' ' : (rs->rs_status == 0) ? '*' : '!');
}

void
ath5k_debug_printrxbuffs(struct ath5k_hw *ah)
{
        struct ath5k_desc *ds;
        struct ath5k_buf *bf;
        struct ath5k_rx_status rs = {};
        int status;

        if (likely(!(ah->debug.level & ATH5K_DEBUG_DESC)))
                return;

        printk(KERN_DEBUG "rxdp %x, rxlink %p\n",
                ath5k_hw_get_rxdp(ah), ah->rxlink);

        spin_lock_bh(&ah->rxbuflock);
        list_for_each_entry(bf, &ah->rxbuf, list) {
                ds = bf->desc;
                status = ah->ah_proc_rx_desc(ah, ds, &rs);
                if (!status)
                        ath5k_debug_printrxbuf(bf, status == 0, &rs);
        }
        spin_unlock_bh(&ah->rxbuflock);
}

void
ath5k_debug_printtxbuf(struct ath5k_hw *ah, struct ath5k_buf *bf)
{
        struct ath5k_desc *ds = bf->desc;
        struct ath5k_hw_5212_tx_desc *td = &ds->ud.ds_tx5212;
        struct ath5k_tx_status ts = {};
        int done;

        if (likely(!(ah->debug.level & ATH5K_DEBUG_DESC)))
                return;

        done = ah->ah_proc_tx_desc(ah, bf->desc, &ts);

        printk(KERN_DEBUG "T (%p %llx) %08x %08x %08x %08x %08x %08x %08x "
                "%08x %c\n", ds, (unsigned long long)bf->daddr, ds->ds_link,
                ds->ds_data, td->tx_ctl.tx_control_0, td->tx_ctl.tx_control_1,
                td->tx_ctl.tx_control_2, td->tx_ctl.tx_control_3,
                td->tx_stat.tx_status_0, td->tx_stat.tx_status_1,
                done ? ' ' : (ts.ts_status == 0) ? '*' : '!');
}