debug.c

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/*
 * Copyright (c) 2004-2011 Atheros Communications Inc.
 * Copyright (c) 2011-2012 Qualcomm Atheros, 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 <linux/skbuff.h>
#include <linux/fs.h>
#include <linux/vmalloc.h>
#include <linux/export.h>

#include "debug.h"
#include "target.h"

struct ath6kl_fwlog_slot {
    __le32 timestamp;
    __le32 length;

    /* max ATH6KL_FWLOG_PAYLOAD_SIZE bytes */
    u8 payload[0];
};

#define ATH6KL_FWLOG_MAX_ENTRIES 20

#define ATH6KL_FWLOG_VALID_MASK 0x1ffff

int ath6kl_printk(const char *level, const char *fmt, ...)
{
    struct va_format vaf;
    va_list args;
    int rtn;

    va_start(args, fmt);

    vaf.fmt = fmt;
    vaf.va = &args;

    rtn = printk("%sath6kl: %pV", level, &vaf);

    va_end(args);

    return rtn;
}
EXPORT_SYMBOL(ath6kl_printk);

#ifdef CONFIG_ATH6KL_DEBUG

void ath6kl_dbg(enum ATH6K_DEBUG_MASK mask, const char *fmt, ...)
{
    struct va_format vaf;
    va_list args;

    if (!(debug_mask & mask))
        return;

    va_start(args, fmt);

    vaf.fmt = fmt;
    vaf.va = &args;

    ath6kl_printk(KERN_DEBUG, "%pV", &vaf);

    va_end(args);
}
EXPORT_SYMBOL(ath6kl_dbg);

void ath6kl_dbg_dump(enum ATH6K_DEBUG_MASK mask,
             const char *msg, const char *prefix,
             const void *buf, size_t len)
{
    if (debug_mask & mask) {
        if (msg)
            ath6kl_dbg(mask, "%s\n", msg);

        print_hex_dump_bytes(prefix, DUMP_PREFIX_OFFSET, buf, len);
    }
}
EXPORT_SYMBOL(ath6kl_dbg_dump);

#define REG_OUTPUT_LEN_PER_LINE 25
#define REGTYPE_STR_LEN     100

struct ath6kl_diag_reg_info {
    u32 reg_start;
    u32 reg_end;
    const char *reg_info;
};

static const struct ath6kl_diag_reg_info diag_reg[] = {
    { 0x20000, 0x200fc, "General DMA and Rx registers" },
    { 0x28000, 0x28900, "MAC PCU register & keycache" },
    { 0x20800, 0x20a40, "QCU" },
    { 0x21000, 0x212f0, "DCU" },
    { 0x4000,  0x42e4, "RTC" },
    { 0x540000, 0x540000 + (256 * 1024), "RAM" },
    { 0x29800, 0x2B210, "Base Band" },
    { 0x1C000, 0x1C748, "Analog" },
};

void ath6kl_dump_registers(struct ath6kl_device *dev,
               struct ath6kl_irq_proc_registers *irq_proc_reg,
               struct ath6kl_irq_enable_reg *irq_enable_reg)
{

    ath6kl_dbg(ATH6KL_DBG_IRQ, ("<------- Register Table -------->\n"));

    if (irq_proc_reg != NULL) {
        ath6kl_dbg(ATH6KL_DBG_IRQ,
               "Host Int status:           0x%x\n",
               irq_proc_reg->host_int_status);
        ath6kl_dbg(ATH6KL_DBG_IRQ,
               "CPU Int status:            0x%x\n",
               irq_proc_reg->cpu_int_status);
        ath6kl_dbg(ATH6KL_DBG_IRQ,
               "Error Int status:          0x%x\n",
               irq_proc_reg->error_int_status);
        ath6kl_dbg(ATH6KL_DBG_IRQ,
               "Counter Int status:        0x%x\n",
               irq_proc_reg->counter_int_status);
        ath6kl_dbg(ATH6KL_DBG_IRQ,
               "Mbox Frame:                0x%x\n",
               irq_proc_reg->mbox_frame);
        ath6kl_dbg(ATH6KL_DBG_IRQ,
               "Rx Lookahead Valid:        0x%x\n",
               irq_proc_reg->rx_lkahd_valid);
        ath6kl_dbg(ATH6KL_DBG_IRQ,
               "Rx Lookahead 0:            0x%x\n",
               irq_proc_reg->rx_lkahd[0]);
        ath6kl_dbg(ATH6KL_DBG_IRQ,
               "Rx Lookahead 1:            0x%x\n",
               irq_proc_reg->rx_lkahd[1]);

        if (dev->ar->mbox_info.gmbox_addr != 0) {
            /*
             * If the target supports GMBOX hardware, dump some
             * additional state.
             */
            ath6kl_dbg(ATH6KL_DBG_IRQ,
                   "GMBOX Host Int status 2:   0x%x\n",
                   irq_proc_reg->host_int_status2);
            ath6kl_dbg(ATH6KL_DBG_IRQ,
                   "GMBOX RX Avail:            0x%x\n",
                   irq_proc_reg->gmbox_rx_avail);
            ath6kl_dbg(ATH6KL_DBG_IRQ,
                   "GMBOX lookahead alias 0:   0x%x\n",
                   irq_proc_reg->rx_gmbox_lkahd_alias[0]);
            ath6kl_dbg(ATH6KL_DBG_IRQ,
                   "GMBOX lookahead alias 1:   0x%x\n",
                   irq_proc_reg->rx_gmbox_lkahd_alias[1]);
        }

    }

    if (irq_enable_reg != NULL) {
        ath6kl_dbg(ATH6KL_DBG_IRQ,
               "Int status Enable:         0x%x\n",
               irq_enable_reg->int_status_en);
        ath6kl_dbg(ATH6KL_DBG_IRQ, "Counter Int status Enable: 0x%x\n",
               irq_enable_reg->cntr_int_status_en);
    }
    ath6kl_dbg(ATH6KL_DBG_IRQ, "<------------------------------->\n");
}

static void dump_cred_dist(struct htc_endpoint_credit_dist *ep_dist)
{
    ath6kl_dbg(ATH6KL_DBG_CREDIT,
           "--- endpoint: %d  svc_id: 0x%X ---\n",
           ep_dist->endpoint, ep_dist->svc_id);
    ath6kl_dbg(ATH6KL_DBG_CREDIT, " dist_flags     : 0x%X\n",
           ep_dist->dist_flags);
    ath6kl_dbg(ATH6KL_DBG_CREDIT, " cred_norm      : %d\n",
           ep_dist->cred_norm);
    ath6kl_dbg(ATH6KL_DBG_CREDIT, " cred_min       : %d\n",
           ep_dist->cred_min);
    ath6kl_dbg(ATH6KL_DBG_CREDIT, " credits        : %d\n",
           ep_dist->credits);
    ath6kl_dbg(ATH6KL_DBG_CREDIT, " cred_assngd    : %d\n",
           ep_dist->cred_assngd);
    ath6kl_dbg(ATH6KL_DBG_CREDIT, " seek_cred      : %d\n",
           ep_dist->seek_cred);
    ath6kl_dbg(ATH6KL_DBG_CREDIT, " cred_sz        : %d\n",
           ep_dist->cred_sz);
    ath6kl_dbg(ATH6KL_DBG_CREDIT, " cred_per_msg   : %d\n",
           ep_dist->cred_per_msg);
    ath6kl_dbg(ATH6KL_DBG_CREDIT, " cred_to_dist   : %d\n",
           ep_dist->cred_to_dist);
    ath6kl_dbg(ATH6KL_DBG_CREDIT, " txq_depth      : %d\n",
           get_queue_depth(&ep_dist->htc_ep->txq));
    ath6kl_dbg(ATH6KL_DBG_CREDIT,
           "----------------------------------\n");
}

/* FIXME: move to htc.c */
void dump_cred_dist_stats(struct htc_target *target)
{
    struct htc_endpoint_credit_dist *ep_list;

    list_for_each_entry(ep_list, &target->cred_dist_list, list)
        dump_cred_dist(ep_list);

    ath6kl_dbg(ATH6KL_DBG_CREDIT,
           "credit distribution total %d free %d\n",
           target->credit_info->total_avail_credits,
           target->credit_info->cur_free_credits);
}

void ath6kl_debug_war(struct ath6kl *ar, enum ath6kl_war war)
{
    switch (war) {
    case ATH6KL_WAR_INVALID_RATE:
        ar->debug.war_stats.invalid_rate++;
        break;
    }
}

static ssize_t read_file_war_stats(struct file *file, char __user *user_buf,
                   size_t count, loff_t *ppos)
{
    struct ath6kl *ar = file->private_data;
    char *buf;
    unsigned int len = 0, buf_len = 1500;
    ssize_t ret_cnt;

    buf = kzalloc(buf_len, GFP_KERNEL);
    if (!buf)
        return -ENOMEM;

    len += scnprintf(buf + len, buf_len - len, "\n");
    len += scnprintf(buf + len, buf_len - len, "%25s\n",
             "Workaround stats");
    len += scnprintf(buf + len, buf_len - len, "%25s\n\n",
             "=================");
    len += scnprintf(buf + len, buf_len - len, "%20s %10u\n",
             "Invalid rates", ar->debug.war_stats.invalid_rate);

    if (WARN_ON(len > buf_len))
        len = buf_len;

    ret_cnt = simple_read_from_buffer(user_buf, count, ppos, buf, len);

    kfree(buf);
    return ret_cnt;
}

static const struct file_operations fops_war_stats = {
    .read = read_file_war_stats,
    .open = simple_open,
    .owner = THIS_MODULE,
    .llseek = default_llseek,
};

void ath6kl_debug_fwlog_event(struct ath6kl *ar, const void *buf, size_t len)
{
    struct ath6kl_fwlog_slot *slot;
    struct sk_buff *skb;
    size_t slot_len;

    if (WARN_ON(len > ATH6KL_FWLOG_PAYLOAD_SIZE))
        return;

    slot_len = sizeof(*slot) + ATH6KL_FWLOG_PAYLOAD_SIZE;

    skb = alloc_skb(slot_len, GFP_KERNEL);
    if (!skb)
        return;

    slot = (struct ath6kl_fwlog_slot *) skb_put(skb, slot_len);
    slot->timestamp = cpu_to_le32(jiffies);
    slot->length = cpu_to_le32(len);
    memcpy(slot->payload, buf, len);

    /* Need to pad each record to fixed length ATH6KL_FWLOG_PAYLOAD_SIZE */
    memset(slot->payload + len, 0, ATH6KL_FWLOG_PAYLOAD_SIZE - len);

    spin_lock(&ar->debug.fwlog_queue.lock);

    __skb_queue_tail(&ar->debug.fwlog_queue, skb);
    complete(&ar->debug.fwlog_completion);

    /* drop oldest entries */
    while (skb_queue_len(&ar->debug.fwlog_queue) >
           ATH6KL_FWLOG_MAX_ENTRIES) {
        skb = __skb_dequeue(&ar->debug.fwlog_queue);
        kfree_skb(skb);
    }

    spin_unlock(&ar->debug.fwlog_queue.lock);

    return;
}

static int ath6kl_fwlog_open(struct inode *inode, struct file *file)
{
    struct ath6kl *ar = inode->i_private;

    if (ar->debug.fwlog_open)
        return -EBUSY;

    ar->debug.fwlog_open = true;

    file->private_data = inode->i_private;
    return 0;
}

static int ath6kl_fwlog_release(struct inode *inode, struct file *file)
{
    struct ath6kl *ar = inode->i_private;

    ar->debug.fwlog_open = false;

    return 0;
}

static ssize_t ath6kl_fwlog_read(struct file *file, char __user *user_buf,
                 size_t count, loff_t *ppos)
{
    struct ath6kl *ar = file->private_data;
    struct sk_buff *skb;
    ssize_t ret_cnt;
    size_t len = 0;
    char *buf;

    buf = vmalloc(count);
    if (!buf)
        return -ENOMEM;

    /* read undelivered logs from firmware */
    ath6kl_read_fwlogs(ar);

    spin_lock(&ar->debug.fwlog_queue.lock);

    while ((skb = __skb_dequeue(&ar->debug.fwlog_queue))) {
        if (skb->len > count - len) {
            /* not enough space, put skb back and leave */
            __skb_queue_head(&ar->debug.fwlog_queue, skb);
            break;
        }


        memcpy(buf + len, skb->data, skb->len);
        len += skb->len;

        kfree_skb(skb);
    }

    spin_unlock(&ar->debug.fwlog_queue.lock);

    /* FIXME: what to do if len == 0? */

    ret_cnt = simple_read_from_buffer(user_buf, count, ppos, buf, len);

    vfree(buf);

    return ret_cnt;
}

static const struct file_operations fops_fwlog = {
    .open = ath6kl_fwlog_open,
    .release = ath6kl_fwlog_release,
    .read = ath6kl_fwlog_read,
    .owner = THIS_MODULE,
    .llseek = default_llseek,
};

static ssize_t ath6kl_fwlog_block_read(struct file *file,
                       char __user *user_buf,
                       size_t count,
                       loff_t *ppos)
{
    struct ath6kl *ar = file->private_data;
    struct sk_buff *skb;
    ssize_t ret_cnt;
    size_t len = 0, not_copied;
    char *buf;
    int ret;

    buf = vmalloc(count);
    if (!buf)
        return -ENOMEM;

    spin_lock(&ar->debug.fwlog_queue.lock);

    if (skb_queue_len(&ar->debug.fwlog_queue) == 0) {
        /* we must init under queue lock */
        init_completion(&ar->debug.fwlog_completion);

        spin_unlock(&ar->debug.fwlog_queue.lock);

        ret = wait_for_completion_interruptible(
            &ar->debug.fwlog_completion);
        if (ret == -ERESTARTSYS) {
            vfree(buf);
            return ret;
        }

        spin_lock(&ar->debug.fwlog_queue.lock);
    }

    while ((skb = __skb_dequeue(&ar->debug.fwlog_queue))) {
        if (skb->len > count - len) {
            /* not enough space, put skb back and leave */
            __skb_queue_head(&ar->debug.fwlog_queue, skb);
            break;
        }


        memcpy(buf + len, skb->data, skb->len);
        len += skb->len;

        kfree_skb(skb);
    }

    spin_unlock(&ar->debug.fwlog_queue.lock);

    /* FIXME: what to do if len == 0? */

    not_copied = copy_to_user(user_buf, buf, len);
    if (not_copied != 0) {
        ret_cnt = -EFAULT;
        goto out;
    }

    *ppos = *ppos + len;

    ret_cnt = len;

out:
    vfree(buf);

    return ret_cnt;
}

static const struct file_operations fops_fwlog_block = {
    .open = ath6kl_fwlog_open,
    .release = ath6kl_fwlog_release,
    .read = ath6kl_fwlog_block_read,
    .owner = THIS_MODULE,
    .llseek = default_llseek,
};

static ssize_t ath6kl_fwlog_mask_read(struct file *file, char __user *user_buf,
                      size_t count, loff_t *ppos)
{
    struct ath6kl *ar = file->private_data;
    char buf[16];
    int len;

    len = snprintf(buf, sizeof(buf), "0x%x\n", ar->debug.fwlog_mask);

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

static ssize_t ath6kl_fwlog_mask_write(struct file *file,
                       const char __user *user_buf,
                       size_t count, loff_t *ppos)
{
    struct ath6kl *ar = file->private_data;
    int ret;

    ret = kstrtou32_from_user(user_buf, count, 0, &ar->debug.fwlog_mask);
    if (ret)
        return ret;

    ret = ath6kl_wmi_config_debug_module_cmd(ar->wmi,
                         ATH6KL_FWLOG_VALID_MASK,
                         ar->debug.fwlog_mask);
    if (ret)
        return ret;

    return count;
}

static const struct file_operations fops_fwlog_mask = {
    .open = simple_open,
    .read = ath6kl_fwlog_mask_read,
    .write = ath6kl_fwlog_mask_write,
    .owner = THIS_MODULE,
    .llseek = default_llseek,
};

static ssize_t read_file_tgt_stats(struct file *file, char __user *user_buf,
                   size_t count, loff_t *ppos)
{
    struct ath6kl *ar = file->private_data;
    struct ath6kl_vif *vif;
    struct target_stats *tgt_stats;
    char *buf;
    unsigned int len = 0, buf_len = 1500;
    int i;
    long left;
    ssize_t ret_cnt;

    vif = ath6kl_vif_first(ar);
    if (!vif)
        return -EIO;

    tgt_stats = &vif->target_stats;

    buf = kzalloc(buf_len, GFP_KERNEL);
    if (!buf)
        return -ENOMEM;

    if (down_interruptible(&ar->sem)) {
        kfree(buf);
        return -EBUSY;
    }

    set_bit(STATS_UPDATE_PEND, &vif->flags);

    if (ath6kl_wmi_get_stats_cmd(ar->wmi, 0)) {
        up(&ar->sem);
        kfree(buf);
        return -EIO;
    }

    left = wait_event_interruptible_timeout(ar->event_wq,
                        !test_bit(STATS_UPDATE_PEND,
                        &vif->flags), WMI_TIMEOUT);

    up(&ar->sem);

    if (left <= 0) {
        kfree(buf);
        return -ETIMEDOUT;
    }

    len += scnprintf(buf + len, buf_len - len, "\n");
    len += scnprintf(buf + len, buf_len - len, "%25s\n",
             "Target Tx stats");
    len += scnprintf(buf + len, buf_len - len, "%25s\n\n",
             "=================");
    len += scnprintf(buf + len, buf_len - len, "%20s %10llu\n",
             "Ucast packets", tgt_stats->tx_ucast_pkt);
    len += scnprintf(buf + len, buf_len - len, "%20s %10llu\n",
             "Bcast packets", tgt_stats->tx_bcast_pkt);
    len += scnprintf(buf + len, buf_len - len, "%20s %10llu\n",
             "Ucast byte", tgt_stats->tx_ucast_byte);
    len += scnprintf(buf + len, buf_len - len, "%20s %10llu\n",
             "Bcast byte", tgt_stats->tx_bcast_byte);
    len += scnprintf(buf + len, buf_len - len, "%20s %10llu\n",
             "Rts success cnt", tgt_stats->tx_rts_success_cnt);
    for (i = 0; i < 4; i++)
        len += scnprintf(buf + len, buf_len - len,
                 "%18s %d %10llu\n", "PER on ac",
                 i, tgt_stats->tx_pkt_per_ac[i]);
    len += scnprintf(buf + len, buf_len - len, "%20s %10llu\n",
             "Error", tgt_stats->tx_err);
    len += scnprintf(buf + len, buf_len - len, "%20s %10llu\n",
             "Fail count", tgt_stats->tx_fail_cnt);
    len += scnprintf(buf + len, buf_len - len, "%20s %10llu\n",
             "Retry count", tgt_stats->tx_retry_cnt);
    len += scnprintf(buf + len, buf_len - len, "%20s %10llu\n",
             "Multi retry cnt", tgt_stats->tx_mult_retry_cnt);
    len += scnprintf(buf + len, buf_len - len, "%20s %10llu\n",
             "Rts fail cnt", tgt_stats->tx_rts_fail_cnt);
    len += scnprintf(buf + len, buf_len - len, "%25s %10llu\n\n",
             "TKIP counter measure used",
             tgt_stats->tkip_cnter_measures_invoked);

    len += scnprintf(buf + len, buf_len - len, "%25s\n",
             "Target Rx stats");
    len += scnprintf(buf + len, buf_len - len, "%25s\n",
             "=================");

    len += scnprintf(buf + len, buf_len - len, "%20s %10llu\n",
             "Ucast packets", tgt_stats->rx_ucast_pkt);
    len += scnprintf(buf + len, buf_len - len, "%20s %10d\n",
             "Ucast Rate", tgt_stats->rx_ucast_rate);
    len += scnprintf(buf + len, buf_len - len, "%20s %10llu\n",
             "Bcast packets", tgt_stats->rx_bcast_pkt);
    len += scnprintf(buf + len, buf_len - len, "%20s %10llu\n",
             "Ucast byte", tgt_stats->rx_ucast_byte);
    len += scnprintf(buf + len, buf_len - len, "%20s %10llu\n",
             "Bcast byte", tgt_stats->rx_bcast_byte);
    len += scnprintf(buf + len, buf_len - len, "%20s %10llu\n",
             "Fragmented pkt", tgt_stats->rx_frgment_pkt);
    len += scnprintf(buf + len, buf_len - len, "%20s %10llu\n",
             "Error", tgt_stats->rx_err);
    len += scnprintf(buf + len, buf_len - len, "%20s %10llu\n",
             "CRC Err", tgt_stats->rx_crc_err);
    len += scnprintf(buf + len, buf_len - len, "%20s %10llu\n",
             "Key chache miss", tgt_stats->rx_key_cache_miss);
    len += scnprintf(buf + len, buf_len - len, "%20s %10llu\n",
             "Decrypt Err", tgt_stats->rx_decrypt_err);
    len += scnprintf(buf + len, buf_len - len, "%20s %10llu\n",
             "Duplicate frame", tgt_stats->rx_dupl_frame);
    len += scnprintf(buf + len, buf_len - len, "%20s %10llu\n",
             "Tkip Mic failure", tgt_stats->tkip_local_mic_fail);
    len += scnprintf(buf + len, buf_len - len, "%20s %10llu\n",
             "TKIP format err", tgt_stats->tkip_fmt_err);
    len += scnprintf(buf + len, buf_len - len, "%20s %10llu\n",
             "CCMP format Err", tgt_stats->ccmp_fmt_err);
    len += scnprintf(buf + len, buf_len - len, "%20s %10llu\n\n",
             "CCMP Replay Err", tgt_stats->ccmp_replays);

    len += scnprintf(buf + len, buf_len - len, "%25s\n",
             "Misc Target stats");
    len += scnprintf(buf + len, buf_len - len, "%25s\n",
             "=================");
    len += scnprintf(buf + len, buf_len - len, "%20s %10llu\n",
             "Beacon Miss count", tgt_stats->cs_bmiss_cnt);
    len += scnprintf(buf + len, buf_len - len, "%20s %10llu\n",
             "Num Connects", tgt_stats->cs_connect_cnt);
    len += scnprintf(buf + len, buf_len - len, "%20s %10llu\n",
             "Num disconnects", tgt_stats->cs_discon_cnt);
    len += scnprintf(buf + len, buf_len - len, "%20s %10d\n",
             "Beacon avg rssi", tgt_stats->cs_ave_beacon_rssi);
    len += scnprintf(buf + len, buf_len - len, "%20s %10d\n",
             "ARP pkt received", tgt_stats->arp_received);
    len += scnprintf(buf + len, buf_len - len, "%20s %10d\n",
             "ARP pkt matched", tgt_stats->arp_matched);
    len += scnprintf(buf + len, buf_len - len, "%20s %10d\n",
             "ARP pkt replied", tgt_stats->arp_replied);

    if (len > buf_len)
        len = buf_len;

    ret_cnt = simple_read_from_buffer(user_buf, count, ppos, buf, len);

    kfree(buf);
    return ret_cnt;
}

static const struct file_operations fops_tgt_stats = {
    .read = read_file_tgt_stats,
    .open = simple_open,
    .owner = THIS_MODULE,
    .llseek = default_llseek,
};

#define print_credit_info(fmt_str, ep_list_field)       \
    (len += scnprintf(buf + len, buf_len - len, fmt_str,    \
             ep_list->ep_list_field))
#define CREDIT_INFO_DISPLAY_STRING_LEN  200
#define CREDIT_INFO_LEN 128

static ssize_t read_file_credit_dist_stats(struct file *file,
                       char __user *user_buf,
                       size_t count, loff_t *ppos)
{
    struct ath6kl *ar = file->private_data;
    struct htc_target *target = ar->htc_target;
    struct htc_endpoint_credit_dist *ep_list;
    char *buf;
    unsigned int buf_len, len = 0;
    ssize_t ret_cnt;

    buf_len = CREDIT_INFO_DISPLAY_STRING_LEN +
          get_queue_depth(&target->cred_dist_list) * CREDIT_INFO_LEN;
    buf = kzalloc(buf_len, GFP_KERNEL);
    if (!buf)
        return -ENOMEM;

    len += scnprintf(buf + len, buf_len - len, "%25s%5d\n",
             "Total Avail Credits: ",
             target->credit_info->total_avail_credits);
    len += scnprintf(buf + len, buf_len - len, "%25s%5d\n",
             "Free credits :",
             target->credit_info->cur_free_credits);

    len += scnprintf(buf + len, buf_len - len,
             " Epid  Flags    Cred_norm  Cred_min  Credits  Cred_assngd"
             "  Seek_cred  Cred_sz  Cred_per_msg  Cred_to_dist"
             "  qdepth\n");

    list_for_each_entry(ep_list, &target->cred_dist_list, list) {
        print_credit_info("  %2d", endpoint);
        print_credit_info("%10x", dist_flags);
        print_credit_info("%8d", cred_norm);
        print_credit_info("%9d", cred_min);
        print_credit_info("%9d", credits);
        print_credit_info("%10d", cred_assngd);
        print_credit_info("%13d", seek_cred);
        print_credit_info("%12d", cred_sz);
        print_credit_info("%9d", cred_per_msg);
        print_credit_info("%14d", cred_to_dist);
        len += scnprintf(buf + len, buf_len - len, "%12d\n",
                 get_queue_depth(&ep_list->htc_ep->txq));
    }

    if (len > buf_len)
        len = buf_len;

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

static const struct file_operations fops_credit_dist_stats = {
    .read = read_file_credit_dist_stats,
    .open = simple_open,
    .owner = THIS_MODULE,
    .llseek = default_llseek,
};

static unsigned int print_endpoint_stat(struct htc_target *target, char *buf,
                    unsigned int buf_len, unsigned int len,
                    int offset, const char *name)
{
    int i;
    struct htc_endpoint_stats *ep_st;
    u32 *counter;

    len += scnprintf(buf + len, buf_len - len, "%s:", name);
    for (i = 0; i < ENDPOINT_MAX; i++) {
        ep_st = &target->endpoint[i].ep_st;
        counter = ((u32 *) ep_st) + (offset / 4);
        len += scnprintf(buf + len, buf_len - len, " %u", *counter);
    }
    len += scnprintf(buf + len, buf_len - len, "\n");

    return len;
}

static ssize_t ath6kl_endpoint_stats_read(struct file *file,
                      char __user *user_buf,
                      size_t count, loff_t *ppos)
{
    struct ath6kl *ar = file->private_data;
    struct htc_target *target = ar->htc_target;
    char *buf;
    unsigned int buf_len, len = 0;
    ssize_t ret_cnt;

    buf_len = sizeof(struct htc_endpoint_stats) / sizeof(u32) *
        (25 + ENDPOINT_MAX * 11);
    buf = kmalloc(buf_len, GFP_KERNEL);
    if (!buf)
        return -ENOMEM;

#define EPSTAT(name)                            \
    do {                                \
        len = print_endpoint_stat(target, buf, buf_len, len,    \
                      offsetof(struct htc_endpoint_stats, \
                           name),       \
                      #name);           \
    } while (0)

    EPSTAT(cred_low_indicate);
    EPSTAT(tx_issued);
    EPSTAT(tx_pkt_bundled);
    EPSTAT(tx_bundles);
    EPSTAT(tx_dropped);
    EPSTAT(tx_cred_rpt);
    EPSTAT(cred_rpt_from_rx);
    EPSTAT(cred_rpt_from_other);
    EPSTAT(cred_rpt_ep0);
    EPSTAT(cred_from_rx);
    EPSTAT(cred_from_other);
    EPSTAT(cred_from_ep0);
    EPSTAT(cred_cosumd);
    EPSTAT(cred_retnd);
    EPSTAT(rx_pkts);
    EPSTAT(rx_lkahds);
    EPSTAT(rx_bundl);
    EPSTAT(rx_bundle_lkahd);
    EPSTAT(rx_bundle_from_hdr);
    EPSTAT(rx_alloc_thresh_hit);
    EPSTAT(rxalloc_thresh_byte);
#undef EPSTAT

    if (len > buf_len)
        len = buf_len;

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

static ssize_t ath6kl_endpoint_stats_write(struct file *file,
                       const char __user *user_buf,
                       size_t count, loff_t *ppos)
{
    struct ath6kl *ar = file->private_data;
    struct htc_target *target = ar->htc_target;
    int ret, i;
    u32 val;
    struct htc_endpoint_stats *ep_st;

    ret = kstrtou32_from_user(user_buf, count, 0, &val);
    if (ret)
        return ret;
    if (val == 0) {
        for (i = 0; i < ENDPOINT_MAX; i++) {
            ep_st = &target->endpoint[i].ep_st;
            memset(ep_st, 0, sizeof(*ep_st));
        }
    }

    return count;
}

static const struct file_operations fops_endpoint_stats = {
    .open = simple_open,
    .read = ath6kl_endpoint_stats_read,
    .write = ath6kl_endpoint_stats_write,
    .owner = THIS_MODULE,
    .llseek = default_llseek,
};

static unsigned long ath6kl_get_num_reg(void)
{
    int i;
    unsigned long n_reg = 0;

    for (i = 0; i < ARRAY_SIZE(diag_reg); i++)
        n_reg = n_reg +
             (diag_reg[i].reg_end - diag_reg[i].reg_start) / 4 + 1;

    return n_reg;
}

static bool ath6kl_dbg_is_diag_reg_valid(u32 reg_addr)
{
    int i;

    for (i = 0; i < ARRAY_SIZE(diag_reg); i++) {
        if (reg_addr >= diag_reg[i].reg_start &&
            reg_addr <= diag_reg[i].reg_end)
            return true;
    }

    return false;
}

static ssize_t ath6kl_regread_read(struct file *file, char __user *user_buf,
                    size_t count, loff_t *ppos)
{
    struct ath6kl *ar = file->private_data;
    u8 buf[50];
    unsigned int len = 0;

    if (ar->debug.dbgfs_diag_reg)
        len += scnprintf(buf + len, sizeof(buf) - len, "0x%x\n",
                ar->debug.dbgfs_diag_reg);
    else
        len += scnprintf(buf + len, sizeof(buf) - len,
                 "All diag registers\n");

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

static ssize_t ath6kl_regread_write(struct file *file,
                    const char __user *user_buf,
                    size_t count, loff_t *ppos)
{
    struct ath6kl *ar = file->private_data;
    unsigned long reg_addr;

    if (kstrtoul_from_user(user_buf, count, 0, &reg_addr))
        return -EINVAL;

    if ((reg_addr % 4) != 0)
        return -EINVAL;

    if (reg_addr && !ath6kl_dbg_is_diag_reg_valid(reg_addr))
        return -EINVAL;

    ar->debug.dbgfs_diag_reg = reg_addr;

    return count;
}

static const struct file_operations fops_diag_reg_read = {
    .read = ath6kl_regread_read,
    .write = ath6kl_regread_write,
    .open = simple_open,
    .owner = THIS_MODULE,
    .llseek = default_llseek,
};

static int ath6kl_regdump_open(struct inode *inode, struct file *file)
{
    struct ath6kl *ar = inode->i_private;
    u8 *buf;
    unsigned long int reg_len;
    unsigned int len = 0, n_reg;
    u32 addr;
    __le32 reg_val;
    int i, status;

    /* Dump all the registers if no register is specified */
    if (!ar->debug.dbgfs_diag_reg)
        n_reg = ath6kl_get_num_reg();
    else
        n_reg = 1;

    reg_len = n_reg * REG_OUTPUT_LEN_PER_LINE;
    if (n_reg > 1)
        reg_len += REGTYPE_STR_LEN;

    buf = vmalloc(reg_len);
    if (!buf)
        return -ENOMEM;

    if (n_reg == 1) {
        addr = ar->debug.dbgfs_diag_reg;

        status = ath6kl_diag_read32(ar,
                TARG_VTOP(ar->target_type, addr),
                (u32 *)&reg_val);
        if (status)
            goto fail_reg_read;

        len += scnprintf(buf + len, reg_len - len,
                 "0x%06x 0x%08x\n", addr, le32_to_cpu(reg_val));
        goto done;
    }

    for (i = 0; i < ARRAY_SIZE(diag_reg); i++) {
        len += scnprintf(buf + len, reg_len - len,
                "%s\n", diag_reg[i].reg_info);
        for (addr = diag_reg[i].reg_start;
             addr <= diag_reg[i].reg_end; addr += 4) {
            status = ath6kl_diag_read32(ar,
                    TARG_VTOP(ar->target_type, addr),
                    (u32 *)&reg_val);
            if (status)
                goto fail_reg_read;

            len += scnprintf(buf + len, reg_len - len,
                    "0x%06x 0x%08x\n",
                    addr, le32_to_cpu(reg_val));
        }
    }

done:
    file->private_data = buf;
    return 0;

fail_reg_read:
    ath6kl_warn("Unable to read memory:%u\n", addr);
    vfree(buf);
    return -EIO;
}

static ssize_t ath6kl_regdump_read(struct file *file, char __user *user_buf,
                  size_t count, loff_t *ppos)
{
    u8 *buf = file->private_data;
    return simple_read_from_buffer(user_buf, count, ppos, buf, strlen(buf));
}

static int ath6kl_regdump_release(struct inode *inode, struct file *file)
{
    vfree(file->private_data);
    return 0;
}

static const struct file_operations fops_reg_dump = {
    .open = ath6kl_regdump_open,
    .read = ath6kl_regdump_read,
    .release = ath6kl_regdump_release,
    .owner = THIS_MODULE,
    .llseek = default_llseek,
};

static ssize_t ath6kl_lrssi_roam_write(struct file *file,
                       const char __user *user_buf,
                       size_t count, loff_t *ppos)
{
    struct ath6kl *ar = file->private_data;
    unsigned long lrssi_roam_threshold;

    if (kstrtoul_from_user(user_buf, count, 0, &lrssi_roam_threshold))
        return -EINVAL;

    ar->lrssi_roam_threshold = lrssi_roam_threshold;

    ath6kl_wmi_set_roam_lrssi_cmd(ar->wmi, ar->lrssi_roam_threshold);

    return count;
}

static ssize_t ath6kl_lrssi_roam_read(struct file *file,
                      char __user *user_buf,
                      size_t count, loff_t *ppos)
{
    struct ath6kl *ar = file->private_data;
    char buf[32];
    unsigned int len;

    len = snprintf(buf, sizeof(buf), "%u\n", ar->lrssi_roam_threshold);

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

static const struct file_operations fops_lrssi_roam_threshold = {
    .read = ath6kl_lrssi_roam_read,
    .write = ath6kl_lrssi_roam_write,
    .open = simple_open,
    .owner = THIS_MODULE,
    .llseek = default_llseek,
};

static ssize_t ath6kl_regwrite_read(struct file *file,
                    char __user *user_buf,
                    size_t count, loff_t *ppos)
{
    struct ath6kl *ar = file->private_data;
    u8 buf[32];
    unsigned int len = 0;

    len = scnprintf(buf, sizeof(buf), "Addr: 0x%x Val: 0x%x\n",
            ar->debug.diag_reg_addr_wr, ar->debug.diag_reg_val_wr);

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

static ssize_t ath6kl_regwrite_write(struct file *file,
                     const char __user *user_buf,
                     size_t count, loff_t *ppos)
{
    struct ath6kl *ar = file->private_data;
    char buf[32];
    char *sptr, *token;
    unsigned int len = 0;
    u32 reg_addr, reg_val;

    len = min(count, sizeof(buf) - 1);
    if (copy_from_user(buf, user_buf, len))
        return -EFAULT;

    buf[len] = '\0';
    sptr = buf;

    token = strsep(&sptr, "=");
    if (!token)
        return -EINVAL;

    if (kstrtou32(token, 0, &reg_addr))
        return -EINVAL;

    if (!ath6kl_dbg_is_diag_reg_valid(reg_addr))
        return -EINVAL;

    if (kstrtou32(sptr, 0, &reg_val))
        return -EINVAL;

    ar->debug.diag_reg_addr_wr = reg_addr;
    ar->debug.diag_reg_val_wr = reg_val;

    if (ath6kl_diag_write32(ar, ar->debug.diag_reg_addr_wr,
                cpu_to_le32(ar->debug.diag_reg_val_wr)))
        return -EIO;

    return count;
}

static const struct file_operations fops_diag_reg_write = {
    .read = ath6kl_regwrite_read,
    .write = ath6kl_regwrite_write,
    .open = simple_open,
    .owner = THIS_MODULE,
    .llseek = default_llseek,
};

int ath6kl_debug_roam_tbl_event(struct ath6kl *ar, const void *buf,
                size_t len)
{
    const struct wmi_target_roam_tbl *tbl;
    u16 num_entries;

    if (len < sizeof(*tbl))
        return -EINVAL;

    tbl = (const struct wmi_target_roam_tbl *) buf;
    num_entries = le16_to_cpu(tbl->num_entries);
    if (sizeof(*tbl) + num_entries * sizeof(struct wmi_bss_roam_info) >
        len)
        return -EINVAL;

    if (ar->debug.roam_tbl == NULL ||
        ar->debug.roam_tbl_len < (unsigned int) len) {
        kfree(ar->debug.roam_tbl);
        ar->debug.roam_tbl = kmalloc(len, GFP_ATOMIC);
        if (ar->debug.roam_tbl == NULL)
            return -ENOMEM;
    }

    memcpy(ar->debug.roam_tbl, buf, len);
    ar->debug.roam_tbl_len = len;

    if (test_bit(ROAM_TBL_PEND, &ar->flag)) {
        clear_bit(ROAM_TBL_PEND, &ar->flag);
        wake_up(&ar->event_wq);
    }

    return 0;
}

static ssize_t ath6kl_roam_table_read(struct file *file, char __user *user_buf,
                      size_t count, loff_t *ppos)
{
    struct ath6kl *ar = file->private_data;
    int ret;
    long left;
    struct wmi_target_roam_tbl *tbl;
    u16 num_entries, i;
    char *buf;
    unsigned int len, buf_len;
    ssize_t ret_cnt;

    if (down_interruptible(&ar->sem))
        return -EBUSY;

    set_bit(ROAM_TBL_PEND, &ar->flag);

    ret = ath6kl_wmi_get_roam_tbl_cmd(ar->wmi);
    if (ret) {
        up(&ar->sem);
        return ret;
    }

    left = wait_event_interruptible_timeout(
        ar->event_wq, !test_bit(ROAM_TBL_PEND, &ar->flag), WMI_TIMEOUT);
    up(&ar->sem);

    if (left <= 0)
        return -ETIMEDOUT;

    if (ar->debug.roam_tbl == NULL)
        return -ENOMEM;

    tbl = (struct wmi_target_roam_tbl *) ar->debug.roam_tbl;
    num_entries = le16_to_cpu(tbl->num_entries);

    buf_len = 100 + num_entries * 100;
    buf = kzalloc(buf_len, GFP_KERNEL);
    if (buf == NULL)
        return -ENOMEM;
    len = 0;
    len += scnprintf(buf + len, buf_len - len,
             "roam_mode=%u\n\n"
             "# roam_util bssid rssi rssidt last_rssi util bias\n",
             le16_to_cpu(tbl->roam_mode));

    for (i = 0; i < num_entries; i++) {
        struct wmi_bss_roam_info *info = &tbl->info[i];
        len += scnprintf(buf + len, buf_len - len,
                 "%d %pM %d %d %d %d %d\n",
                 a_sle32_to_cpu(info->roam_util), info->bssid,
                 info->rssi, info->rssidt, info->last_rssi,
                 info->util, info->bias);
    }

    if (len > buf_len)
        len = buf_len;

    ret_cnt = simple_read_from_buffer(user_buf, count, ppos, buf, len);

    kfree(buf);
    return ret_cnt;
}

static const struct file_operations fops_roam_table = {
    .read = ath6kl_roam_table_read,
    .open = simple_open,
    .owner = THIS_MODULE,
    .llseek = default_llseek,
};

static ssize_t ath6kl_force_roam_write(struct file *file,
                       const char __user *user_buf,
                       size_t count, loff_t *ppos)
{
    struct ath6kl *ar = file->private_data;
    int ret;
    char buf[20];
    size_t len;
    u8 bssid[ETH_ALEN];
    int i;
    int addr[ETH_ALEN];

    len = min(count, sizeof(buf) - 1);
    if (copy_from_user(buf, user_buf, len))
        return -EFAULT;
    buf[len] = '\0';

    if (sscanf(buf, "%02x:%02x:%02x:%02x:%02x:%02x",
           &addr[0], &addr[1], &addr[2], &addr[3], &addr[4], &addr[5])
        != ETH_ALEN)
        return -EINVAL;
    for (i = 0; i < ETH_ALEN; i++)
        bssid[i] = addr[i];

    ret = ath6kl_wmi_force_roam_cmd(ar->wmi, bssid);
    if (ret)
        return ret;

    return count;
}

static const struct file_operations fops_force_roam = {
    .write = ath6kl_force_roam_write,
    .open = simple_open,
    .owner = THIS_MODULE,
    .llseek = default_llseek,
};

static ssize_t ath6kl_roam_mode_write(struct file *file,
                      const char __user *user_buf,
                      size_t count, loff_t *ppos)
{
    struct ath6kl *ar = file->private_data;
    int ret;
    char buf[20];
    size_t len;
    enum wmi_roam_mode mode;

    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 (strcasecmp(buf, "default") == 0)
        mode = WMI_DEFAULT_ROAM_MODE;
    else if (strcasecmp(buf, "bssbias") == 0)
        mode = WMI_HOST_BIAS_ROAM_MODE;
    else if (strcasecmp(buf, "lock") == 0)
        mode = WMI_LOCK_BSS_MODE;
    else
        return -EINVAL;

    ret = ath6kl_wmi_set_roam_mode_cmd(ar->wmi, mode);
    if (ret)
        return ret;

    return count;
}

static const struct file_operations fops_roam_mode = {
    .write = ath6kl_roam_mode_write,
    .open = simple_open,
    .owner = THIS_MODULE,
    .llseek = default_llseek,
};

void ath6kl_debug_set_keepalive(struct ath6kl *ar, u8 keepalive)
{
    ar->debug.keepalive = keepalive;
}

static ssize_t ath6kl_keepalive_read(struct file *file, char __user *user_buf,
                     size_t count, loff_t *ppos)
{
    struct ath6kl *ar = file->private_data;
    char buf[16];
    int len;

    len = snprintf(buf, sizeof(buf), "%u\n", ar->debug.keepalive);

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

static ssize_t ath6kl_keepalive_write(struct file *file,
                      const char __user *user_buf,
                      size_t count, loff_t *ppos)
{
    struct ath6kl *ar = file->private_data;
    int ret;
    u8 val;

    ret = kstrtou8_from_user(user_buf, count, 0, &val);
    if (ret)
        return ret;

    ret = ath6kl_wmi_set_keepalive_cmd(ar->wmi, 0, val);
    if (ret)
        return ret;

    return count;
}

static const struct file_operations fops_keepalive = {
    .open = simple_open,
    .read = ath6kl_keepalive_read,
    .write = ath6kl_keepalive_write,
    .owner = THIS_MODULE,
    .llseek = default_llseek,
};

void ath6kl_debug_set_disconnect_timeout(struct ath6kl *ar, u8 timeout)
{
    ar->debug.disc_timeout = timeout;
}

static ssize_t ath6kl_disconnect_timeout_read(struct file *file,
                          char __user *user_buf,
                          size_t count, loff_t *ppos)
{
    struct ath6kl *ar = file->private_data;
    char buf[16];
    int len;

    len = snprintf(buf, sizeof(buf), "%u\n", ar->debug.disc_timeout);

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

static ssize_t ath6kl_disconnect_timeout_write(struct file *file,
                           const char __user *user_buf,
                           size_t count, loff_t *ppos)
{
    struct ath6kl *ar = file->private_data;
    int ret;
    u8 val;

    ret = kstrtou8_from_user(user_buf, count, 0, &val);
    if (ret)
        return ret;

    ret = ath6kl_wmi_disctimeout_cmd(ar->wmi, 0, val);
    if (ret)
        return ret;

    return count;
}

static const struct file_operations fops_disconnect_timeout = {
    .open = simple_open,
    .read = ath6kl_disconnect_timeout_read,
    .write = ath6kl_disconnect_timeout_write,
    .owner = THIS_MODULE,
    .llseek = default_llseek,
};

static ssize_t ath6kl_create_qos_write(struct file *file,
                        const char __user *user_buf,
                        size_t count, loff_t *ppos)
{

    struct ath6kl *ar = file->private_data;
    struct ath6kl_vif *vif;
    char buf[200];
    ssize_t len;
    char *sptr, *token;
    struct wmi_create_pstream_cmd pstream;
    u32 val32;
    u16 val16;

    vif = ath6kl_vif_first(ar);
    if (!vif)
        return -EIO;

    len = min(count, sizeof(buf) - 1);
    if (copy_from_user(buf, user_buf, len))
        return -EFAULT;
    buf[len] = '\0';
    sptr = buf;

    token = strsep(&sptr, " ");
    if (!token)
        return -EINVAL;
    if (kstrtou8(token, 0, &pstream.user_pri))
        return -EINVAL;

    token = strsep(&sptr, " ");
    if (!token)
        return -EINVAL;
    if (kstrtou8(token, 0, &pstream.traffic_direc))
        return -EINVAL;

    token = strsep(&sptr, " ");
    if (!token)
        return -EINVAL;
    if (kstrtou8(token, 0, &pstream.traffic_class))
        return -EINVAL;

    token = strsep(&sptr, " ");
    if (!token)
        return -EINVAL;
    if (kstrtou8(token, 0, &pstream.traffic_type))
        return -EINVAL;

    token = strsep(&sptr, " ");
    if (!token)
        return -EINVAL;
    if (kstrtou8(token, 0, &pstream.voice_psc_cap))
        return -EINVAL;

    token = strsep(&sptr, " ");
    if (!token)
        return -EINVAL;
    if (kstrtou32(token, 0, &val32))
        return -EINVAL;
    pstream.min_service_int = cpu_to_le32(val32);

    token = strsep(&sptr, " ");
    if (!token)
        return -EINVAL;
    if (kstrtou32(token, 0, &val32))
        return -EINVAL;
    pstream.max_service_int = cpu_to_le32(val32);

    token = strsep(&sptr, " ");
    if (!token)
        return -EINVAL;
    if (kstrtou32(token, 0, &val32))
        return -EINVAL;
    pstream.inactivity_int = cpu_to_le32(val32);

    token = strsep(&sptr, " ");
    if (!token)
        return -EINVAL;
    if (kstrtou32(token, 0, &val32))
        return -EINVAL;
    pstream.suspension_int = cpu_to_le32(val32);

    token = strsep(&sptr, " ");
    if (!token)
        return -EINVAL;
    if (kstrtou32(token, 0, &val32))
        return -EINVAL;
    pstream.service_start_time = cpu_to_le32(val32);

    token = strsep(&sptr, " ");
    if (!token)
        return -EINVAL;
    if (kstrtou8(token, 0, &pstream.tsid))
        return -EINVAL;

    token = strsep(&sptr, " ");
    if (!token)
        return -EINVAL;
    if (kstrtou16(token, 0, &val16))
        return -EINVAL;
    pstream.nominal_msdu = cpu_to_le16(val16);

    token = strsep(&sptr, " ");
    if (!token)
        return -EINVAL;
    if (kstrtou16(token, 0, &val16))
        return -EINVAL;
    pstream.max_msdu = cpu_to_le16(val16);

    token = strsep(&sptr, " ");
    if (!token)
        return -EINVAL;
    if (kstrtou32(token, 0, &val32))
        return -EINVAL;
    pstream.min_data_rate = cpu_to_le32(val32);

    token = strsep(&sptr, " ");
    if (!token)
        return -EINVAL;
    if (kstrtou32(token, 0, &val32))
        return -EINVAL;
    pstream.mean_data_rate = cpu_to_le32(val32);

    token = strsep(&sptr, " ");
    if (!token)
        return -EINVAL;
    if (kstrtou32(token, 0, &val32))
        return -EINVAL;
    pstream.peak_data_rate = cpu_to_le32(val32);

    token = strsep(&sptr, " ");
    if (!token)
        return -EINVAL;
    if (kstrtou32(token, 0, &val32))
        return -EINVAL;
    pstream.max_burst_size = cpu_to_le32(val32);

    token = strsep(&sptr, " ");
    if (!token)
        return -EINVAL;
    if (kstrtou32(token, 0, &val32))
        return -EINVAL;
    pstream.delay_bound = cpu_to_le32(val32);

    token = strsep(&sptr, " ");
    if (!token)
        return -EINVAL;
    if (kstrtou32(token, 0, &val32))
        return -EINVAL;
    pstream.min_phy_rate = cpu_to_le32(val32);

    token = strsep(&sptr, " ");
    if (!token)
        return -EINVAL;
    if (kstrtou32(token, 0, &val32))
        return -EINVAL;
    pstream.sba = cpu_to_le32(val32);

    token = strsep(&sptr, " ");
    if (!token)
        return -EINVAL;
    if (kstrtou32(token, 0, &val32))
        return -EINVAL;
    pstream.medium_time = cpu_to_le32(val32);

    pstream.nominal_phy = le32_to_cpu(pstream.min_phy_rate) / 1000000;

    ath6kl_wmi_create_pstream_cmd(ar->wmi, vif->fw_vif_idx, &pstream);

    return count;
}

static const struct file_operations fops_create_qos = {
    .write = ath6kl_create_qos_write,
    .open = simple_open,
    .owner = THIS_MODULE,
    .llseek = default_llseek,
};

static ssize_t ath6kl_delete_qos_write(struct file *file,
                const char __user *user_buf,
                size_t count, loff_t *ppos)
{

    struct ath6kl *ar = file->private_data;
    struct ath6kl_vif *vif;
    char buf[100];
    ssize_t len;
    char *sptr, *token;
    u8 traffic_class;
    u8 tsid;

    vif = ath6kl_vif_first(ar);
    if (!vif)
        return -EIO;

    len = min(count, sizeof(buf) - 1);
    if (copy_from_user(buf, user_buf, len))
        return -EFAULT;
    buf[len] = '\0';
    sptr = buf;

    token = strsep(&sptr, " ");
    if (!token)
        return -EINVAL;
    if (kstrtou8(token, 0, &traffic_class))
        return -EINVAL;

    token = strsep(&sptr, " ");
    if (!token)
        return -EINVAL;
    if (kstrtou8(token, 0, &tsid))
        return -EINVAL;

    ath6kl_wmi_delete_pstream_cmd(ar->wmi, vif->fw_vif_idx,
                      traffic_class, tsid);

    return count;
}

static const struct file_operations fops_delete_qos = {
    .write = ath6kl_delete_qos_write,
    .open = simple_open,
    .owner = THIS_MODULE,
    .llseek = default_llseek,
};

static ssize_t ath6kl_bgscan_int_write(struct file *file,
                const char __user *user_buf,
                size_t count, loff_t *ppos)
{
    struct ath6kl *ar = file->private_data;
    struct ath6kl_vif *vif;
    u16 bgscan_int;
    char buf[32];
    ssize_t len;

    vif = ath6kl_vif_first(ar);
    if (!vif)
        return -EIO;

    len = min(count, sizeof(buf) - 1);
    if (copy_from_user(buf, user_buf, len))
        return -EFAULT;

    buf[len] = '\0';
    if (kstrtou16(buf, 0, &bgscan_int))
        return -EINVAL;

    if (bgscan_int == 0)
        bgscan_int = 0xffff;

    vif->bg_scan_period = bgscan_int;

    ath6kl_wmi_scanparams_cmd(ar->wmi, 0, 0, 0, bgscan_int, 0, 0, 0, 3,
                  0, 0, 0);

    return count;
}

static const struct file_operations fops_bgscan_int = {
    .write = ath6kl_bgscan_int_write,
    .open = simple_open,
    .owner = THIS_MODULE,
    .llseek = default_llseek,
};

static ssize_t ath6kl_listen_int_write(struct file *file,
                       const char __user *user_buf,
                       size_t count, loff_t *ppos)
{
    struct ath6kl *ar = file->private_data;
    struct ath6kl_vif *vif;
    u16 listen_interval;
    char buf[32];
    ssize_t len;

    vif = ath6kl_vif_first(ar);
    if (!vif)
        return -EIO;

    len = min(count, sizeof(buf) - 1);
    if (copy_from_user(buf, user_buf, len))
        return -EFAULT;

    buf[len] = '\0';
    if (kstrtou16(buf, 0, &listen_interval))
        return -EINVAL;

    if ((listen_interval < 15) || (listen_interval > 3000))
        return -EINVAL;

    vif->listen_intvl_t = listen_interval;
    ath6kl_wmi_listeninterval_cmd(ar->wmi, vif->fw_vif_idx,
                      vif->listen_intvl_t, 0);

    return count;
}

static ssize_t ath6kl_listen_int_read(struct file *file,
                      char __user *user_buf,
                      size_t count, loff_t *ppos)
{
    struct ath6kl *ar = file->private_data;
    struct ath6kl_vif *vif;
    char buf[32];
    int len;

    vif = ath6kl_vif_first(ar);
    if (!vif)
        return -EIO;

    len = scnprintf(buf, sizeof(buf), "%u\n", vif->listen_intvl_t);

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

static const struct file_operations fops_listen_int = {
    .read = ath6kl_listen_int_read,
    .write = ath6kl_listen_int_write,
    .open = simple_open,
    .owner = THIS_MODULE,
    .llseek = default_llseek,
};

static ssize_t ath6kl_power_params_write(struct file *file,
                        const char __user *user_buf,
                        size_t count, loff_t *ppos)
{
    struct ath6kl *ar = file->private_data;
    u8 buf[100];
    unsigned int len = 0;
    char *sptr, *token;
    u16 idle_period, ps_poll_num, dtim,
        tx_wakeup, num_tx;

    len = min(count, sizeof(buf) - 1);
    if (copy_from_user(buf, user_buf, len))
        return -EFAULT;
    buf[len] = '\0';
    sptr = buf;

    token = strsep(&sptr, " ");
    if (!token)
        return -EINVAL;
    if (kstrtou16(token, 0, &idle_period))
        return -EINVAL;

    token = strsep(&sptr, " ");
    if (!token)
        return -EINVAL;
    if (kstrtou16(token, 0, &ps_poll_num))
        return -EINVAL;

    token = strsep(&sptr, " ");
    if (!token)
        return -EINVAL;
    if (kstrtou16(token, 0, &dtim))
        return -EINVAL;

    token = strsep(&sptr, " ");
    if (!token)
        return -EINVAL;
    if (kstrtou16(token, 0, &tx_wakeup))
        return -EINVAL;

    token = strsep(&sptr, " ");
    if (!token)
        return -EINVAL;
    if (kstrtou16(token, 0, &num_tx))
        return -EINVAL;

    ath6kl_wmi_pmparams_cmd(ar->wmi, 0, idle_period, ps_poll_num,
                dtim, tx_wakeup, num_tx, 0);

    return count;
}

static const struct file_operations fops_power_params = {
    .write = ath6kl_power_params_write,
    .open = simple_open,
    .owner = THIS_MODULE,
    .llseek = default_llseek,
};

void ath6kl_debug_init(struct ath6kl *ar)
{
    skb_queue_head_init(&ar->debug.fwlog_queue);
    init_completion(&ar->debug.fwlog_completion);

    /*
     * Actually we are lying here but don't know how to read the mask
     * value from the firmware.
     */
    ar->debug.fwlog_mask = 0;
}

/*
 * Initialisation needs to happen in two stages as fwlog events can come
 * before cfg80211 is initialised, and debugfs depends on cfg80211
 * initialisation.
 */
int ath6kl_debug_init_fs(struct ath6kl *ar)
{
    ar->debugfs_phy = debugfs_create_dir("ath6kl",
                         ar->wiphy->debugfsdir);
    if (!ar->debugfs_phy)
        return -ENOMEM;

    debugfs_create_file("tgt_stats", S_IRUSR, ar->debugfs_phy, ar,
                &fops_tgt_stats);

    debugfs_create_file("credit_dist_stats", S_IRUSR, ar->debugfs_phy, ar,
                &fops_credit_dist_stats);

    debugfs_create_file("endpoint_stats", S_IRUSR | S_IWUSR,
                ar->debugfs_phy, ar, &fops_endpoint_stats);

    debugfs_create_file("fwlog", S_IRUSR, ar->debugfs_phy, ar,
                &fops_fwlog);

    debugfs_create_file("fwlog_block", S_IRUSR, ar->debugfs_phy, ar,
                &fops_fwlog_block);

    debugfs_create_file("fwlog_mask", S_IRUSR | S_IWUSR, ar->debugfs_phy,
                ar, &fops_fwlog_mask);

    debugfs_create_file("reg_addr", S_IRUSR | S_IWUSR, ar->debugfs_phy, ar,
                &fops_diag_reg_read);

    debugfs_create_file("reg_dump", S_IRUSR, ar->debugfs_phy, ar,
                &fops_reg_dump);

    debugfs_create_file("lrssi_roam_threshold", S_IRUSR | S_IWUSR,
                ar->debugfs_phy, ar, &fops_lrssi_roam_threshold);

    debugfs_create_file("reg_write", S_IRUSR | S_IWUSR,
                ar->debugfs_phy, ar, &fops_diag_reg_write);

    debugfs_create_file("war_stats", S_IRUSR, ar->debugfs_phy, ar,
                &fops_war_stats);

    debugfs_create_file("roam_table", S_IRUSR, ar->debugfs_phy, ar,
                &fops_roam_table);

    debugfs_create_file("force_roam", S_IWUSR, ar->debugfs_phy, ar,
                &fops_force_roam);

    debugfs_create_file("roam_mode", S_IWUSR, ar->debugfs_phy, ar,
                &fops_roam_mode);

    debugfs_create_file("keepalive", S_IRUSR | S_IWUSR, ar->debugfs_phy, ar,
                &fops_keepalive);

    debugfs_create_file("disconnect_timeout", S_IRUSR | S_IWUSR,
                ar->debugfs_phy, ar, &fops_disconnect_timeout);

    debugfs_create_file("create_qos", S_IWUSR, ar->debugfs_phy, ar,
                &fops_create_qos);

    debugfs_create_file("delete_qos", S_IWUSR, ar->debugfs_phy, ar,
                &fops_delete_qos);

    debugfs_create_file("bgscan_interval", S_IWUSR,
                ar->debugfs_phy, ar, &fops_bgscan_int);

    debugfs_create_file("listen_interval", S_IRUSR | S_IWUSR,
                ar->debugfs_phy, ar, &fops_listen_int);

    debugfs_create_file("power_params", S_IWUSR, ar->debugfs_phy, ar,
                &fops_power_params);

    return 0;
}

void ath6kl_debug_cleanup(struct ath6kl *ar)
{
    skb_queue_purge(&ar->debug.fwlog_queue);
    complete(&ar->debug.fwlog_completion);
    kfree(ar->debug.roam_tbl);
}

#endif