/*
 * Copyright (c) 2008-2011 Atheros Communications Inc.
 * Copyright (c) 2011 Neratec Solutions AG
 *
 * 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 <linux/debugfs.h>
#include <linux/export.h>

#include "ath9k.h"
#include "dfs_debug.h"
#include "../dfs_pattern_detector.h"

static struct ath_dfs_pool_stats dfs_pool_stats = { 0 };

#define ATH9K_DFS_STAT(s, p) \
        len += scnprintf(buf + len, size - len, "%28s : %10u\n", s, \
                         sc->debug.stats.dfs_stats.p)
#define ATH9K_DFS_POOL_STAT(s, p) \
        len += scnprintf(buf + len, size - len, "%28s : %10u\n", s, \
                         dfs_pool_stats.p);

static ssize_t read_file_dfs(struct file *file, char __user *user_buf,
                             size_t count, loff_t *ppos)
{
        struct ath_softc *sc = file->private_data;
        struct ath9k_hw_version *hw_ver = &sc->sc_ah->hw_version;
        char *buf;
        unsigned int len = 0, size = 8000;
        ssize_t retval = 0;

        buf = kzalloc(size, GFP_KERNEL);
        if (buf == NULL)
                return -ENOMEM;

        len += scnprintf(buf + len, size - len, "DFS support for "
                         "macVersion = 0x%x, macRev = 0x%x: %s\n",
                         hw_ver->macVersion, hw_ver->macRev,
                         (sc->sc_ah->caps.hw_caps & ATH9K_HW_CAP_DFS) ?
                                        "enabled" : "disabled");

        if (!sc->dfs_detector) {
                len += scnprintf(buf + len, size - len,
                                 "DFS detector not enabled\n");
                goto exit;
        }

        dfs_pool_stats = sc->dfs_detector->get_stats(sc->dfs_detector);

        len += scnprintf(buf + len, size - len, "Pulse detector statistics:\n");
        ATH9K_DFS_STAT("pulse events reported   ", pulses_total);
        ATH9K_DFS_STAT("invalid pulse events    ", pulses_no_dfs);
        ATH9K_DFS_STAT("DFS pulses detected     ", pulses_detected);
        ATH9K_DFS_STAT("Datalen discards        ", datalen_discards);
        ATH9K_DFS_STAT("RSSI discards           ", rssi_discards);
        ATH9K_DFS_STAT("BW info discards        ", bwinfo_discards);
        ATH9K_DFS_STAT("Primary channel pulses  ", pri_phy_errors);
        ATH9K_DFS_STAT("Secondary channel pulses", ext_phy_errors);
        ATH9K_DFS_STAT("Dual channel pulses     ", dc_phy_errors);
        len += scnprintf(buf + len, size - len, "Radar detector statistics "
                         "(current DFS region: %d)\n",
                         sc->dfs_detector->region);
        ATH9K_DFS_STAT("Pulse events processed  ", pulses_processed);
        ATH9K_DFS_STAT("Radars detected         ", radar_detected);
        len += scnprintf(buf + len, size - len, "Global Pool statistics:\n");
        ATH9K_DFS_POOL_STAT("Pool references         ", pool_reference);
        ATH9K_DFS_POOL_STAT("Pulses allocated        ", pulse_allocated);
        ATH9K_DFS_POOL_STAT("Pulses alloc error      ", pulse_alloc_error);
        ATH9K_DFS_POOL_STAT("Pulses in use           ", pulse_used);
        ATH9K_DFS_POOL_STAT("Seqs. allocated         ", pseq_allocated);
        ATH9K_DFS_POOL_STAT("Seqs. alloc error       ", pseq_alloc_error);
        ATH9K_DFS_POOL_STAT("Seqs. in use            ", pseq_used);

exit:
        if (len > size)
                len = size;

        retval = simple_read_from_buffer(user_buf, count, ppos, buf, len);
        kfree(buf);

        return retval;
}

/* magic number to prevent accidental reset of DFS statistics */
#define DFS_STATS_RESET_MAGIC   0x80000000
static ssize_t write_file_dfs(struct file *file, const char __user *user_buf,
                              size_t count, loff_t *ppos)
{
        struct ath_softc *sc = file->private_data;
        unsigned long val;
        ssize_t ret;

        ret = kstrtoul_from_user(user_buf, count, 0, &val);
        if (ret)
                return ret;
        if (val == DFS_STATS_RESET_MAGIC)
                memset(&sc->debug.stats.dfs_stats, 0,
                       sizeof(sc->debug.stats.dfs_stats));
        return count;
}

static ssize_t write_file_simulate_radar(struct file *file,
                                         const char __user *user_buf,
                                         size_t count, loff_t *ppos)
{
        struct ath_softc *sc = file->private_data;

        ieee80211_radar_detected(sc->hw, NULL);

        return count;
}

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

static const struct file_operations fops_dfs_stats = {
        .read = read_file_dfs,
        .write = write_file_dfs,
        .open = simple_open,
        .owner = THIS_MODULE,
        .llseek = default_llseek,
};

void ath9k_dfs_init_debug(struct ath_softc *sc)
{
        debugfs_create_file("dfs_stats", 0400,
                            sc->debug.debugfs_phy, sc, &fops_dfs_stats);
        debugfs_create_file("dfs_simulate_radar", 0200,
                            sc->debug.debugfs_phy, sc, &fops_simulate_radar);
}