path: root/drivers/net/wireless/ath9k/regd.c

/*
 * Copyright (c) 2008 Atheros Communications Inc.
 *
 * Permission to use, copy, modify, and/or distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#include <linux/kernel.h>
#include <linux/slab.h>
#include "core.h"
#include "hw.h"
#include "regd.h"
#include "regd_common.h"

static int ath9k_regd_chansort(const void *a, const void *b)
{
	const struct ath9k_channel *ca = a;
	const struct ath9k_channel *cb = b;

	return (ca->channel == cb->channel) ?
	    (ca->channelFlags & CHAN_FLAGS) -
	    (cb->channelFlags & CHAN_FLAGS) : ca->channel - cb->channel;
}

static void
ath9k_regd_sort(void *a, u32 n, u32 size, ath_hal_cmp_t *cmp)
{
	u8 *aa = a;
	u8 *ai, *t;

	for (ai = aa + size; --n >= 1; ai += size)
		for (t = ai; t > aa; t -= size) {
			u8 *u = t - size;
			if (cmp(u, t) <= 0)
				break;
			swap(u, t, size);
		}
}

static u16 ath9k_regd_get_eepromRD(struct ath_hal *ah)
{
	return ah->ah_currentRD & ~WORLDWIDE_ROAMING_FLAG;
}

static bool ath9k_regd_is_chan_bm_zero(u64 *bitmask)
{
	int i;

	for (i = 0; i < BMLEN; i++) {
		if (bitmask[i] != 0)
			return false;
	}
	return true;
}

static bool ath9k_regd_is_eeprom_valid(struct ath_hal *ah)
{
	u16 rd = ath9k_regd_get_eepromRD(ah);
	int i;

	if (rd & COUNTRY_ERD_FLAG) {
		u16 cc = rd & ~COUNTRY_ERD_FLAG;
		for (i = 0; i < ARRAY_SIZE(allCountries); i++)
			if (allCountries[i].countryCode == cc)
				return true;
	} else {
		for (i = 0; i < ARRAY_SIZE(regDomainPairs); i++)
			if (regDomainPairs[i].regDmnEnum == rd)
				return true;
	}
	DPRINTF(ah->ah_sc, ATH_DBG_REGULATORY,
		 "%s: invalid regulatory domain/country code 0x%x\n",
		 __func__, rd);
	return false;
}

static bool ath9k_regd_is_fcc_midband_supported(struct ath_hal *ah)
{
	u32 regcap;

	regcap = ah->ah_caps.reg_cap;

	if (regcap & AR_EEPROM_EEREGCAP_EN_FCC_MIDBAND)
		return true;
	else
		return false;
}

static bool ath9k_regd_is_ccode_valid(struct ath_hal *ah,
				      u16 cc)
{
	u16 rd;
	int i;

	if (cc == CTRY_DEFAULT)
		return true;
	if (cc == CTRY_DEBUG)
		return true;

	rd = ath9k_regd_get_eepromRD(ah);
	DPRINTF(ah->ah_sc, ATH_DBG_REGULATORY, "%s: EEPROM regdomain 0x%x\n",
		 __func__, rd);

	if (rd & COUNTRY_ERD_FLAG) {
		DPRINTF(ah->ah_sc, ATH_DBG_REGULATORY,
			"%s: EEPROM setting is country code %u\n",
			__func__, rd & ~COUNTRY_ERD_FLAG);
		return cc == (rd & ~COUNTRY_ERD_FLAG);
	}

	for (i = 0; i < ARRAY_SIZE(allCountries); i++) {
		if (cc == allCountries[i].countryCode) {
#ifdef AH_SUPPORT_11D
			if ((rd &