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// SPDX-License-Identifier: BSD-3-Clause-Clear
/* Copyright (C) 2025 MediaTek Inc. */
#include <linux/of.h>
#include "mt7921.h"
#include "regd.h"
#include "mcu.h"
static bool mt7921_disable_clc;
module_param_named(disable_clc, mt7921_disable_clc, bool, 0644);
MODULE_PARM_DESC(disable_clc, "disable CLC support");
bool mt7921_regd_clc_supported(struct mt792x_dev *dev)
{
if (mt7921_disable_clc ||
mt76_is_usb(&dev->mt76))
return false;
return true;
}
static void
mt7921_regd_channel_update(struct wiphy *wiphy, struct mt792x_dev *dev)
{
#define IS_UNII_INVALID(idx, sfreq, efreq) \
(!(dev->phy.clc_chan_conf & BIT(idx)) && (cfreq) >= (sfreq) && (cfreq) <= (efreq))
struct ieee80211_supported_band *sband;
struct mt76_dev *mdev = &dev->mt76;
struct device_node *np, *band_np;
struct ieee80211_channel *ch;
int i, cfreq;
np = mt76_find_power_limits_node(mdev);
sband = wiphy->bands[NL80211_BAND_5GHZ];
band_np = np ? of_get_child_by_name(np, "txpower-5g") : NULL;
for (i = 0; i < sband->n_channels; i++) {
ch = &sband->channels[i];
cfreq = ch->center_freq;
if (np && (!band_np || !mt76_find_channel_node(band_np, ch))) {
ch->flags |= IEEE80211_CHAN_DISABLED;
continue;
}
/* UNII-4 */
if (IS_UNII_INVALID(0, 5845, 5925))
ch->flags |= IEEE80211_CHAN_DISABLED;
}
sband = wiphy->bands[NL80211_BAND_6GHZ];
if (!sband)
return;
band_np = np ? of_get_child_by_name(np, "txpower-6g") : NULL;
for (i = 0; i < sband->n_channels; i++) {
ch = &sband->channels[i];
cfreq = ch->center_freq;
if (np && (!band_np || !mt76_find_channel_node(band_np, ch))) {
ch->flags |= IEEE80211_CHAN_DISABLED;
continue;
}
/* UNII-5/6/7/8 */
if (IS_UNII_INVALID(1, 5925, 6425) ||
IS_UNII_INVALID(2, 6425, 6525) ||
IS_UNII_INVALID(3, 6525, 6875) ||
IS_UNII_INVALID(4, 6875, 7125))
ch->flags |= IEEE80211_CHAN_DISABLED;
}
}
int mt7921_mcu_regd_update(struct mt792x_dev *dev, u8 *alpha2,
enum environment_cap country_ie_env)
{
struct mt76_dev *mdev = &dev->mt76;
struct ieee80211_hw *hw = mdev->hw;
struct wiphy *wiphy = hw->wiphy;
int ret = 0;
dev->regd_in_progress = true;
mt792x_mutex_acquire(dev);
if (!dev->regd_change)
goto err;
ret = mt7921_mcu_set_clc(dev, alpha2, country_ie_env);
if (ret < 0)
goto err;
mt7921_regd_channel_update(wiphy, dev);
ret = mt76_connac_mcu_set_channel_domain(hw->priv);
if (ret < 0)
goto err;
ret = mt7921_set_tx_sar_pwr(hw, NULL);
if (ret < 0)
goto err;
err:
mt792x_mutex_release(dev);
dev->regd_change = false;
dev->regd_in_progress = false;
wake_up(&dev->wait);
return ret;
}
EXPORT_SYMBOL_GPL(mt7921_mcu_regd_update);
void mt7921_regd_notifier(struct wiphy *wiphy,
struct regulatory_request *req)
{
struct ieee80211_hw *hw = wiphy_to_ieee80211_hw(wiphy);
struct mt792x_dev *dev = mt792x_hw_dev(hw);
struct mt76_connac_pm *pm = &dev->pm;
struct mt76_dev *mdev = &dev->mt76;
if (req->initiator == NL80211_REGDOM_SET_BY_USER &&
!dev->regd_user)
dev->regd_user = true;
/* do not need to update the same country twice */
if (!memcmp(req->alpha2, mdev->alpha2, 2) &&
dev->country_ie_env == req->country_ie_env)
return;
memcpy(mdev->alpha2, req->alpha2, 2);
mdev->region = req->dfs_region;
dev->country_ie_env = req->country_ie_env;
if (req->initiator == NL80211_REGDOM_SET_BY_USER) {
if (dev->mt76.alpha2[0] == '0' && dev->mt76.alpha2[1] == '0')
wiphy->regulatory_flags &= ~REGULATORY_COUNTRY_IE_IGNORE;
else
wiphy->regulatory_flags |= REGULATORY_COUNTRY_IE_IGNORE;
}
dev->regd_change = true;
if (pm->suspended)
return;
mt7921_mcu_regd_update(dev, req->alpha2,
req->country_ie_env);
}
static bool
mt7921_regd_is_valid_alpha2(const char *alpha2)
{
if (!alpha2)
return false;
if (alpha2[0] == '0' && alpha2[1] == '0')
return true;
if (isalpha(alpha2[0]) && isalpha(alpha2[1]))
return true;
return false;
}
int mt7921_regd_change(struct mt792x_phy *phy, char *alpha2)
{
struct wiphy *wiphy = phy->mt76->hw->wiphy;
struct ieee80211_hw *hw = wiphy_to_ieee80211_hw(wiphy);
struct mt792x_dev *dev = mt792x_hw_dev(hw);
struct mt76_dev *mdev = &dev->mt76;
if (dev->hw_full_reset)
return 0;
if (!mt7921_regd_is_valid_alpha2(alpha2) ||
!mt7921_regd_clc_supported(dev) ||
dev->regd_user)
return -EINVAL;
if (mdev->alpha2[0] != '0' && mdev->alpha2[1] != '0')
return 0;
/* do not need to update the same country twice */
if (!memcmp(alpha2, mdev->alpha2, 2))
return 0;
if (phy->chip_cap & MT792x_CHIP_CAP_11D_EN)
return regulatory_hint(wiphy, alpha2);
else
return mt7921_mcu_set_clc(dev, alpha2, ENVIRON_INDOOR);
}
int mt7921_regd_init(struct mt792x_phy *phy)
{
struct wiphy *wiphy = phy->mt76->hw->wiphy;
struct ieee80211_hw *hw = wiphy_to_ieee80211_hw(wiphy);
struct mt792x_dev *dev = mt792x_hw_dev(hw);
struct mt76_dev *mdev = &dev->mt76;
if (phy->chip_cap & MT792x_CHIP_CAP_11D_EN)
wiphy->regulatory_flags |= REGULATORY_COUNTRY_IE_IGNORE |
REGULATORY_DISABLE_BEACON_HINTS;
else
memzero_explicit(&mdev->alpha2, sizeof(mdev->alpha2));
return 0;
}
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