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linux-pinenote/drivers/net/wireless/ath/regd.c
Bruno Randolf 5719efdde1 ath: Add function to check if 4.9GHz channels are allowed 
This adds a helper function to ath/regd.c which can be asked if 4.9GHz channels
are allowed for a given regulatory domain code. This keeps the knowledge of
regdomains and defines like MKK9_MKKC in one place. I'm passing the regdomain
code instead of the ath_regulatory structure because this needs to be called
quite early in the driver inititalization where ath_regulatory is not available
yet in ath5k.

I'm using MKK9_MKKC only because this is the regdomain in the 802.11j enabled
sample cards we got from our vendor. I found some hints in HAL code that this
is used by Atheros to indicate 4.9GHz channels support and that there might be
other domain codes as well, but as I don't have any documentation I'm just
putting in what I need right now. It can be extended later.

Signed-off-by: Bruno Randolf <br1@einfach.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
2011-01-28 15:44:26 -05:00

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/*
* Copyright (c) 2008-2009 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.
*/
#include <linux/kernel.h>
#include <net/cfg80211.h>
#include <net/mac80211.h>
#include "regd.h"
#include "regd_common.h"
/*
* This is a set of common rules used by our world regulatory domains.
* We have 12 world regulatory domains. To save space we consolidate
* the regulatory domains in 5 structures by frequency and change
* the flags on our reg_notifier() on a case by case basis.
*/
/* Only these channels all allow active scan on all world regulatory domains */
#define ATH9K_2GHZ_CH01_11 REG_RULE(2412-10, 2462+10, 40, 0, 20, 0)
/* We enable active scan on these a case by case basis by regulatory domain */
#define ATH9K_2GHZ_CH12_13 REG_RULE(2467-10, 2472+10, 40, 0, 20,\
NL80211_RRF_PASSIVE_SCAN)
#define ATH9K_2GHZ_CH14 REG_RULE(2484-10, 2484+10, 40, 0, 20,\
NL80211_RRF_PASSIVE_SCAN | NL80211_RRF_NO_OFDM)
/* We allow IBSS on these on a case by case basis by regulatory domain */
#define ATH9K_5GHZ_5150_5350 REG_RULE(5150-10, 5350+10, 40, 0, 30,\
NL80211_RRF_PASSIVE_SCAN | NL80211_RRF_NO_IBSS)
#define ATH9K_5GHZ_5470_5850 REG_RULE(5470-10, 5850+10, 40, 0, 30,\
NL80211_RRF_PASSIVE_SCAN | NL80211_RRF_NO_IBSS)
#define ATH9K_5GHZ_5725_5850 REG_RULE(5725-10, 5850+10, 40, 0, 30,\
NL80211_RRF_PASSIVE_SCAN | NL80211_RRF_NO_IBSS)
#define ATH9K_2GHZ_ALL ATH9K_2GHZ_CH01_11, \
ATH9K_2GHZ_CH12_13, \
ATH9K_2GHZ_CH14
#define ATH9K_5GHZ_ALL ATH9K_5GHZ_5150_5350, \
ATH9K_5GHZ_5470_5850
/* This one skips what we call "mid band" */
#define ATH9K_5GHZ_NO_MIDBAND ATH9K_5GHZ_5150_5350, \
ATH9K_5GHZ_5725_5850
/* Can be used for:
* 0x60, 0x61, 0x62 */
static const struct ieee80211_regdomain ath_world_regdom_60_61_62 = {
.n_reg_rules = 5,
.alpha2 = "99",
.reg_rules = {
ATH9K_2GHZ_ALL,
ATH9K_5GHZ_ALL,
}
};
/* Can be used by 0x63 and 0x65 */
static const struct ieee80211_regdomain ath_world_regdom_63_65 = {
.n_reg_rules = 4,
.alpha2 = "99",
.reg_rules = {
ATH9K_2GHZ_CH01_11,
ATH9K_2GHZ_CH12_13,
ATH9K_5GHZ_NO_MIDBAND,
}
};
/* Can be used by 0x64 only */
static const struct ieee80211_regdomain ath_world_regdom_64 = {
.n_reg_rules = 3,
.alpha2 = "99",
.reg_rules = {
ATH9K_2GHZ_CH01_11,
ATH9K_5GHZ_NO_MIDBAND,
}
};
/* Can be used by 0x66 and 0x69 */
static const struct ieee80211_regdomain ath_world_regdom_66_69 = {
.n_reg_rules = 3,
.alpha2 = "99",
.reg_rules = {
ATH9K_2GHZ_CH01_11,
ATH9K_5GHZ_ALL,
}
};
/* Can be used by 0x67, 0x6A and 0x68 */
static const struct ieee80211_regdomain ath_world_regdom_67_68_6A = {
.n_reg_rules = 4,
.alpha2 = "99",
.reg_rules = {
ATH9K_2GHZ_CH01_11,
ATH9K_2GHZ_CH12_13,
ATH9K_5GHZ_ALL,
}
};
static inline bool is_wwr_sku(u16 regd)
{
return ((regd & COUNTRY_ERD_FLAG) != COUNTRY_ERD_FLAG) &&
(((regd & WORLD_SKU_MASK) == WORLD_SKU_PREFIX) ||
(regd == WORLD));
}
static u16 ath_regd_get_eepromRD(struct ath_regulatory *reg)
{
return reg->current_rd & ~WORLDWIDE_ROAMING_FLAG;
}
bool ath_is_world_regd(struct ath_regulatory *reg)
{
return is_wwr_sku(ath_regd_get_eepromRD(reg));
}
EXPORT_SYMBOL(ath_is_world_regd);
static const struct ieee80211_regdomain *ath_default_world_regdomain(void)
{
/* this is the most restrictive */
return &ath_world_regdom_64;
}
static const struct
ieee80211_regdomain *ath_world_regdomain(struct ath_regulatory *reg)
{
switch (reg->regpair->regDmnEnum) {
case 0x60:
case 0x61:
case 0x62:
return &ath_world_regdom_60_61_62;
case 0x63:
case 0x65:
return &ath_world_regdom_63_65;
case 0x64:
return &ath_world_regdom_64;
case 0x66:
case 0x69:
return &ath_world_regdom_66_69;
case 0x67:
case 0x68:
case 0x6A:
return &ath_world_regdom_67_68_6A;
default:
WARN_ON(1);
return ath_default_world_regdomain();
}
}
bool ath_is_49ghz_allowed(u16 regdomain)
{
/* possibly more */
return regdomain == MKK9_MKKC;
}
EXPORT_SYMBOL(ath_is_49ghz_allowed);
/* Frequency is one where radar detection is required */
static bool ath_is_radar_freq(u16 center_freq)
{
return (center_freq >= 5260 && center_freq <= 5700);
}
/*
* N.B: These exception rules do not apply radar freqs.
*
* - We enable adhoc (or beaconing) if allowed by 11d
* - We enable active scan if the channel is allowed by 11d
* - If no country IE has been processed and a we determine we have
* received a beacon on a channel we can enable active scan and
* adhoc (or beaconing).
*/
static void
ath_reg_apply_beaconing_flags(struct wiphy *wiphy,
enum nl80211_reg_initiator initiator)
{
enum ieee80211_band band;
struct ieee80211_supported_band *sband;
const struct ieee80211_reg_rule *reg_rule;
struct ieee80211_channel *ch;
unsigned int i;
u32 bandwidth = 0;
int r;
for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
if (!wiphy->bands[band])
continue;
sband = wiphy->bands[band];
for (i = 0; i < sband->n_channels; i++) {
ch = &sband->channels[i];
if (ath_is_radar_freq(ch->center_freq) ||
(ch->flags & IEEE80211_CHAN_RADAR))
continue;
if (initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE) {
r = freq_reg_info(wiphy,
ch->center_freq,
bandwidth,
&reg_rule);
if (r)
continue;
/*
* If 11d had a rule for this channel ensure
* we enable adhoc/beaconing if it allows us to
* use it. Note that we would have disabled it
* by applying our static world regdomain by
* default during init, prior to calling our
* regulatory_hint().
*/
if (!(reg_rule->flags &
NL80211_RRF_NO_IBSS))
ch->flags &=
~IEEE80211_CHAN_NO_IBSS;
if (!(reg_rule->flags &
NL80211_RRF_PASSIVE_SCAN))
ch->flags &=
~IEEE80211_CHAN_PASSIVE_SCAN;
} else {
if (ch->beacon_found)
ch->flags &= ~(IEEE80211_CHAN_NO_IBSS |
IEEE80211_CHAN_PASSIVE_SCAN);
}
}
}
}
/* Allows active scan scan on Ch 12 and 13 */
static void
ath_reg_apply_active_scan_flags(struct wiphy *wiphy,
enum nl80211_reg_initiator initiator)
{
struct ieee80211_supported_band *sband;
struct ieee80211_channel *ch;
const struct ieee80211_reg_rule *reg_rule;
u32 bandwidth = 0;
int r;
sband = wiphy->bands[IEEE80211_BAND_2GHZ];
/*
* If no country IE has been received always enable active scan
* on these channels. This is only done for specific regulatory SKUs
*/
if (initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE) {
ch = &sband->channels[11]; /* CH 12 */
if (ch->flags & IEEE80211_CHAN_PASSIVE_SCAN)
ch->flags &= ~IEEE80211_CHAN_PASSIVE_SCAN;
ch = &sband->channels[12]; /* CH 13 */
if (ch->flags & IEEE80211_CHAN_PASSIVE_SCAN)
ch->flags &= ~IEEE80211_CHAN_PASSIVE_SCAN;
return;
}
/*
* If a country IE has been recieved check its rule for this
* channel first before enabling active scan. The passive scan
* would have been enforced by the initial processing of our
* custom regulatory domain.
*/
ch = &sband->channels[11]; /* CH 12 */
r = freq_reg_info(wiphy, ch->center_freq, bandwidth, &reg_rule);
if (!r) {
if (!(reg_rule->flags & NL80211_RRF_PASSIVE_SCAN))
if (ch->flags & IEEE80211_CHAN_PASSIVE_SCAN)
ch->flags &= ~IEEE80211_CHAN_PASSIVE_SCAN;
}
ch = &sband->channels[12]; /* CH 13 */
r = freq_reg_info(wiphy, ch->center_freq, bandwidth, &reg_rule);
if (!r) {
if (!(reg_rule->flags & NL80211_RRF_PASSIVE_SCAN))
if (ch->flags & IEEE80211_CHAN_PASSIVE_SCAN)
ch->flags &= ~IEEE80211_CHAN_PASSIVE_SCAN;
}
}
/* Always apply Radar/DFS rules on freq range 5260 MHz - 5700 MHz */
static void ath_reg_apply_radar_flags(struct wiphy *wiphy)
{
struct ieee80211_supported_band *sband;
struct ieee80211_channel *ch;
unsigned int i;
if (!wiphy->bands[IEEE80211_BAND_5GHZ])
return;
sband = wiphy->bands[IEEE80211_BAND_5GHZ];
for (i = 0; i < sband->n_channels; i++) {
ch = &sband->channels[i];
if (!ath_is_radar_freq(ch->center_freq))
continue;
/* We always enable radar detection/DFS on this
* frequency range. Additionally we also apply on
* this frequency range:
* - If STA mode does not yet have DFS supports disable
* active scanning
* - If adhoc mode does not support DFS yet then
* disable adhoc in the frequency.
* - If AP mode does not yet support radar detection/DFS
* do not allow AP mode
*/
if (!(ch->flags & IEEE80211_CHAN_DISABLED))
ch->flags |= IEEE80211_CHAN_RADAR |
IEEE80211_CHAN_NO_IBSS |
IEEE80211_CHAN_PASSIVE_SCAN;
}
}
static void ath_reg_apply_world_flags(struct wiphy *wiphy,
enum nl80211_reg_initiator initiator,
struct ath_regulatory *reg)
{
switch (reg->regpair->regDmnEnum) {
case 0x60:
case 0x63:
case 0x66:
case 0x67:
ath_reg_apply_beaconing_flags(wiphy, initiator);
break;
case 0x68:
ath_reg_apply_beaconing_flags(wiphy, initiator);
ath_reg_apply_active_scan_flags(wiphy, initiator);
break;
}
}
int ath_reg_notifier_apply(struct wiphy *wiphy,
struct regulatory_request *request,
struct ath_regulatory *reg)
{
/* We always apply this */
ath_reg_apply_radar_flags(wiphy);
/*
* This would happen when we have sent a custom regulatory request
* a world regulatory domain and the scheduler hasn't yet processed
* any pending requests in the queue.
*/
if (!request)
return 0;
switch (request->initiator) {
case NL80211_REGDOM_SET_BY_DRIVER:
case NL80211_REGDOM_SET_BY_CORE:
case NL80211_REGDOM_SET_BY_USER:
break;
case NL80211_REGDOM_SET_BY_COUNTRY_IE:
if (ath_is_world_regd(reg))
ath_reg_apply_world_flags(wiphy, request->initiator,
reg);
break;
}
return 0;
}
EXPORT_SYMBOL(ath_reg_notifier_apply);
static bool ath_regd_is_eeprom_valid(struct ath_regulatory *reg)
{
u16 rd = ath_regd_get_eepromRD(reg);
int i;
if (rd & COUNTRY_ERD_FLAG) {
/* EEPROM value is a country code */
u16 cc = rd & ~COUNTRY_ERD_FLAG;
printk(KERN_DEBUG
"ath: EEPROM indicates we should expect "
"a country code\n");
for (i = 0; i < ARRAY_SIZE(allCountries); i++)
if (allCountries[i].countryCode == cc)
return true;
} else {
/* EEPROM value is a regpair value */
if (rd != CTRY_DEFAULT)
printk(KERN_DEBUG "ath: EEPROM indicates we "
"should expect a direct regpair map\n");
for (i = 0; i < ARRAY_SIZE(regDomainPairs); i++)
if (regDomainPairs[i].regDmnEnum == rd)
return true;
}
printk(KERN_DEBUG
"ath: invalid regulatory domain/country code 0x%x\n", rd);
return false;
}
/* EEPROM country code to regpair mapping */
static struct country_code_to_enum_rd*
ath_regd_find_country(u16 countryCode)
{
int i;
for (i = 0; i < ARRAY_SIZE(allCountries); i++) {
if (allCountries[i].countryCode == countryCode)
return &allCountries[i];
}
return NULL;
}
/* EEPROM rd code to regpair mapping */
static struct country_code_to_enum_rd*
ath_regd_find_country_by_rd(int regdmn)
{
int i;
for (i = 0; i < ARRAY_SIZE(allCountries); i++) {
if (allCountries[i].regDmnEnum == regdmn)
return &allCountries[i];
}
return NULL;
}
/* Returns the map of the EEPROM set RD to a country code */
static u16 ath_regd_get_default_country(u16 rd)
{
if (rd & COUNTRY_ERD_FLAG) {
struct country_code_to_enum_rd *country = NULL;
u16 cc = rd & ~COUNTRY_ERD_FLAG;
country = ath_regd_find_country(cc);
if (country != NULL)
return cc;
}
return CTRY_DEFAULT;
}
static struct reg_dmn_pair_mapping*
ath_get_regpair(int regdmn)
{
int i;
if (regdmn == NO_ENUMRD)
return NULL;
for (i = 0; i < ARRAY_SIZE(regDomainPairs); i++) {
if (regDomainPairs[i].regDmnEnum == regdmn)
return &regDomainPairs[i];
}
return NULL;
}
static int
ath_regd_init_wiphy(struct ath_regulatory *reg,
struct wiphy *wiphy,
int (*reg_notifier)(struct wiphy *wiphy,
struct regulatory_request *request))
{
const struct ieee80211_regdomain *regd;
wiphy->reg_notifier = reg_notifier;
wiphy->flags |= WIPHY_FLAG_STRICT_REGULATORY;
if (ath_is_world_regd(reg)) {
/*
* Anything applied here (prior to wiphy registration) gets
* saved on the wiphy orig_* parameters
*/
regd = ath_world_regdomain(reg);
wiphy->flags |= WIPHY_FLAG_CUSTOM_REGULATORY;
} else {
/*
* This gets applied in the case of the absense of CRDA,
* it's our own custom world regulatory domain, similar to
* cfg80211's but we enable passive scanning.
*/
regd = ath_default_world_regdomain();
}
wiphy_apply_custom_regulatory(wiphy, regd);
ath_reg_apply_radar_flags(wiphy);
ath_reg_apply_world_flags(wiphy, NL80211_REGDOM_SET_BY_DRIVER, reg);
return 0;
}
/*
* Some users have reported their EEPROM programmed with
* 0x8000 set, this is not a supported regulatory domain
* but since we have more than one user with it we need
* a solution for them. We default to 0x64, which is the
* default Atheros world regulatory domain.
*/
static void ath_regd_sanitize(struct ath_regulatory *reg)
{
if (reg->current_rd != COUNTRY_ERD_FLAG)
return;
printk(KERN_DEBUG "ath: EEPROM regdomain sanitized\n");
reg->current_rd = 0x64;
}
int
ath_regd_init(struct ath_regulatory *reg,
struct wiphy *wiphy,
int (*reg_notifier)(struct wiphy *wiphy,
struct regulatory_request *request))
{
struct country_code_to_enum_rd *country = NULL;
u16 regdmn;
if (!reg)
return -EINVAL;
ath_regd_sanitize(reg);
printk(KERN_DEBUG "ath: EEPROM regdomain: 0x%0x\n", reg->current_rd);
if (!ath_regd_is_eeprom_valid(reg)) {
printk(KERN_ERR "ath: Invalid EEPROM contents\n");
return -EINVAL;
}
regdmn = ath_regd_get_eepromRD(reg);
reg->country_code = ath_regd_get_default_country(regdmn);
if (reg->country_code == CTRY_DEFAULT &&
regdmn == CTRY_DEFAULT) {
printk(KERN_DEBUG "ath: EEPROM indicates default "
"country code should be used\n");
reg->country_code = CTRY_UNITED_STATES;
}
if (reg->country_code == CTRY_DEFAULT) {
country = NULL;
} else {
printk(KERN_DEBUG "ath: doing EEPROM country->regdmn "
"map search\n");
country = ath_regd_find_country(reg->country_code);
if (country == NULL) {
printk(KERN_DEBUG
"ath: no valid country maps found for "
"country code: 0x%0x\n",
reg->country_code);
return -EINVAL;
} else {
regdmn = country->regDmnEnum;
printk(KERN_DEBUG "ath: country maps to "
"regdmn code: 0x%0x\n",
regdmn);
}
}
reg->regpair = ath_get_regpair(regdmn);
if (!reg->regpair) {
printk(KERN_DEBUG "ath: "
"No regulatory domain pair found, cannot continue\n");
return -EINVAL;
}
if (!country)
country = ath_regd_find_country_by_rd(regdmn);
if (country) {
reg->alpha2[0] = country->isoName[0];
reg->alpha2[1] = country->isoName[1];
} else {
reg->alpha2[0] = '0';
reg->alpha2[1] = '0';
}
printk(KERN_DEBUG "ath: Country alpha2 being used: %c%c\n",
reg->alpha2[0], reg->alpha2[1]);
printk(KERN_DEBUG "ath: Regpair used: 0x%0x\n",
reg->regpair->regDmnEnum);
ath_regd_init_wiphy(reg, wiphy, reg_notifier);
return 0;
}
EXPORT_SYMBOL(ath_regd_init);
u32 ath_regd_get_band_ctl(struct ath_regulatory *reg,
enum ieee80211_band band)
{
if (!reg->regpair ||
(reg->country_code == CTRY_DEFAULT &&
is_wwr_sku(ath_regd_get_eepromRD(reg)))) {
return SD_NO_CTL;
}
switch (band) {
case IEEE80211_BAND_2GHZ:
return reg->regpair->reg_2ghz_ctl;
case IEEE80211_BAND_5GHZ:
return reg->regpair->reg_5ghz_ctl;
default:
return NO_CTL;
}
}
EXPORT_SYMBOL(ath_regd_get_band_ctl);
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