rtw88: support SAR via kernel common API

Register cfg80211_sar_capa with type NL80211_SAR_TYPE_POWER and four
frequency ranges for configurations in unit of 0.25 dBm. And handle
callback set_sar_specs.

Originally, TX power has three main parameters, i.e. power base,
power by rate, and power limit. The formula can be simply considered
as TX power = power base + min(power by rate, power limit). With the
support of SAR which can be treated as another power limit, there is
one more parameter for TX power. And the formula will evolve into
TX power = power base + min(power by rate, power limit, power sar).

Besides, debugfs tx_pwr_tbl is also refined to show SAR information.
The following is an example for the difference.
Before supporting SAR,
-----------------------------------
...
path rate       pwr       base      (byr  lmt ) rem
   A  CCK_1M     66(0x42)   78  -12 (  12  -12)    0
   A  CCK_2M     66(0x42)   78  -12 (   8  -12)    0
...
-----------------------------------
After supporting SAR and making some configurations,
-----------------------------------
...
path rate       pwr       base      (byr  lmt  sar ) rem
   A  CCK_1M     62(0x3e)   78  -16 (  12  -12  -16)    0
   A  CCK_2M     62(0x3e)   78  -16 (   8  -12  -16)    0
...
-----------------------------------

Signed-off-by: Zong-Zhe Yang <kevin_yang@realtek.com>
Signed-off-by: Ping-Ke Shih <pkshih@realtek.com>
Signed-off-by: Kalle Valo <kvalo@kernel.org>
Link: https://lore.kernel.org/r/20211220093656.65312-1-pkshih@realtek.com

1 files changed, 22 insertions, 0 deletions

diff --git a/drivers/net/wireless/realtek/rtw88/main.c b/drivers/net/wireless/realtek/rtw88/main.c
index b569a67cfb01..38252113c4a8 100644
--- a/drivers/net/wireless/realtek/rtw88/main.c
+++ b/drivers/net/wireless/realtek/rtw88/main.c
@@ -17,6 +17,7 @@
 #include "tx.h"
 #include "debug.h"
 #include "bf.h"
+#include "sar.h"
 
 bool rtw_disable_lps_deep_mode;
 EXPORT_SYMBOL(rtw_disable_lps_deep_mode);
@@ -751,6 +752,25 @@ void rtw_set_channel(struct rtw_dev *rtwdev)
 	hal->current_primary_channel_index = primary_chan_idx;
 	hal->current_band_type = center_chan > 14 ? RTW_BAND_5G : RTW_BAND_2G;
 
+	switch (center_chan) {
+	case 1 ... 14:
+		hal->sar_band = RTW_SAR_BAND_0;
+		break;
+	case 36 ... 64:
+		hal->sar_band = RTW_SAR_BAND_1;
+		break;
+	case 100 ... 144:
+		hal->sar_band = RTW_SAR_BAND_3;
+		break;
+	case 149 ... 177:
+		hal->sar_band = RTW_SAR_BAND_4;
+		break;
+	default:
+		WARN(1, "unknown ch(%u) to SAR band\n", center_chan);
+		hal->sar_band = RTW_SAR_BAND_0;
+		break;
+	}
+
 	for (i = RTW_CHANNEL_WIDTH_20; i <= RTW_MAX_CHANNEL_WIDTH; i++)
 		hal->cch_by_bw[i] = ch_param.cch_by_bw[i];
 
@@ -2037,6 +2057,8 @@ int rtw_register_hw(struct rtw_dev *rtwdev, struct ieee80211_hw *hw)
 	rtw_set_supported_band(hw, rtwdev->chip);
 	SET_IEEE80211_PERM_ADDR(hw, rtwdev->efuse.addr);
 
+	hw->wiphy->sar_capa = &rtw_sar_capa;
+
 	ret = rtw_regd_init(rtwdev);
 	if (ret) {
 		rtw_err(rtwdev, "failed to init regd\n");