drivers/net/wireless/mediatek/mt76/mt7921/regd.c

Source file repositories/reference/linux-study-clean/drivers/net/wireless/mediatek/mt76/mt7921/regd.c

File Facts

System
Linux kernel
Corpus path
drivers/net/wireless/mediatek/mt76/mt7921/regd.c
Extension
.c
Size
5111 bytes
Lines
207
Domain
Driver Families
Bucket
drivers/net
Inferred role
Driver Families: exported/initcall integration point
Status
integration implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

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;

Annotation

Implementation Notes