/*
 * Copyright (c) 2009 Atheros Communications Inc.
 *
 * Permission to use, copy, modify, and/or distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/export.h>
#include <linux/kernel.h>
#include <linux/module.h>

#include "ath.h"
#include "trace.h"

MODULE_AUTHOR("Atheros Communications");
MODULE_DESCRIPTION("Shared library for Atheros wireless LAN cards.");
MODULE_LICENSE("Dual BSD/GPL");

struct sk_buff *ath_rxbuf_alloc(struct ath_common *common,
                                u32 len,
                                gfp_t gfp_mask)
{
        struct sk_buff *skb;
        u32 off;

        /*
         * Cache-line-align.  This is important (for the
         * 5210 at least) as not doing so causes bogus data
         * in rx'd frames.
         */

        /* Note: the kernel can allocate a value greater than
         * what we ask it to give us. We really only need 4 KB as that
         * is this hardware supports and in fact we need at least 3849
         * as that is the MAX AMSDU size this hardware supports.
         * Unfortunately this means we may get 8 KB here from the
         * kernel... and that is actually what is observed on some
         * systems :( */
        skb = __dev_alloc_skb(len + common->cachelsz - 1, gfp_mask);
        if (skb != NULL) {
                off = ((unsigned long) skb->data) % common->cachelsz;
                if (off != 0)
                        skb_reserve(skb, common->cachelsz - off);
        } else {
                pr_err("skbuff alloc of size %u failed\n", len);
                return NULL;
        }

        return skb;
}
EXPORT_SYMBOL(ath_rxbuf_alloc);

bool ath_is_mybeacon(struct ath_common *common, struct ieee80211_hdr *hdr)
{
        return ieee80211_is_beacon(hdr->frame_control) &&
                !is_zero_ether_addr(common->curbssid) &&
                ether_addr_equal_64bits(hdr->addr3, common->curbssid);
}
EXPORT_SYMBOL(ath_is_mybeacon);

void ath_printk(const char *level, const struct ath_common* common,
                const char *fmt, ...)
{
        struct va_format vaf;
        va_list args;

        va_start(args, fmt);

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

        if (common && common->hw && common->hw->wiphy) {
                printk("%sath: %s: %pV",
                       level, wiphy_name(common->hw->wiphy), &vaf);
                trace_ath_log(common->hw->wiphy, &vaf);
        } else {
                printk("%sath: %pV", level, &vaf);
        }

        va_end(args);
}
EXPORT_SYMBOL(ath_printk);

const char *ath_bus_type_strings[] = {
        [ATH_PCI] = "pci",
        [ATH_AHB] = "ahb",
        [ATH_USB] = "usb",
};
EXPORT_SYMBOL(ath_bus_type_strings);