1 files changed, 114 insertions, 0 deletions
diff --git a/drivers/net/wireless/realtek/rtw88/sar.c b/drivers/net/wireless/realtek/rtw88/sar.c
new file mode 100644
index 000000000..c472f1502
--- /dev/null
+++ b/drivers/net/wireless/realtek/rtw88/sar.c
@@ -0,0 +1,114 @@
+// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
+/* Copyright(c) 2018-2021  Realtek Corporation
+ */
+
+#include "sar.h"
+#include "phy.h"
+#include "debug.h"
+
+s8 rtw_query_sar(struct rtw_dev *rtwdev, const struct rtw_sar_arg *arg)
+{
+	const struct rtw_hal *hal = &rtwdev->hal;
+	const struct rtw_sar *sar = &hal->sar;
+
+	switch (sar->src) {
+	default:
+		rtw_warn(rtwdev, "unknown SAR source: %d\n", sar->src);
+		fallthrough;
+	case RTW_SAR_SOURCE_NONE:
+		return (s8)rtwdev->chip->max_power_index;
+	case RTW_SAR_SOURCE_COMMON:
+		return sar->cfg[arg->path][arg->rs].common[arg->sar_band];
+	}
+}
+
+static int rtw_apply_sar(struct rtw_dev *rtwdev, const struct rtw_sar *new)
+{
+	struct rtw_hal *hal = &rtwdev->hal;
+	struct rtw_sar *sar = &hal->sar;
+
+	if (sar->src != RTW_SAR_SOURCE_NONE && new->src != sar->src) {
+		rtw_warn(rtwdev, "SAR source: %d is in use\n", sar->src);
+		return -EBUSY;
+	}
+
+	*sar = *new;
+	rtw_phy_set_tx_power_level(rtwdev, hal->current_channel);
+
+	return 0;
+}
+
+static s8 rtw_sar_to_phy(struct rtw_dev *rtwdev, u8 fct, s32 sar,
+			 const struct rtw_sar_arg *arg)
+{
+	struct rtw_hal *hal = &rtwdev->hal;
+	u8 txgi = rtwdev->chip->txgi_factor;
+	u8 max = rtwdev->chip->max_power_index;
+	s32 tmp;
+	s8 base;
+
+	tmp = fct > txgi ? sar >> (fct - txgi) : sar << (txgi - fct);
+	base = arg->sar_band == RTW_SAR_BAND_0 ?
+	       hal->tx_pwr_by_rate_base_2g[arg->path][arg->rs] :
+	       hal->tx_pwr_by_rate_base_5g[arg->path][arg->rs];
+
+	return (s8)clamp_t(s32, tmp, -max - 1, max) - base;
+}
+
+static const struct cfg80211_sar_freq_ranges rtw_common_sar_freq_ranges[] = {
+	[RTW_SAR_BAND_0] = { .start_freq = 2412, .end_freq = 2484, },
+	[RTW_SAR_BAND_1] = { .start_freq = 5180, .end_freq = 5320, },
+	[RTW_SAR_BAND_3] = { .start_freq = 5500, .end_freq = 5720, },
+	[RTW_SAR_BAND_4] = { .start_freq = 5745, .end_freq = 5825, },
+};
+
+static_assert(ARRAY_SIZE(rtw_common_sar_freq_ranges) == RTW_SAR_BAND_NR);
+
+const struct cfg80211_sar_capa rtw_sar_capa = {
+	.type = NL80211_SAR_TYPE_POWER,
+	.num_freq_ranges = RTW_SAR_BAND_NR,
+	.freq_ranges = rtw_common_sar_freq_ranges,
+};
+
+int rtw_set_sar_specs(struct rtw_dev *rtwdev,
+		      const struct cfg80211_sar_specs *sar)
+{
+	struct rtw_sar_arg arg = {0};
+	struct rtw_sar new = {0};
+	u32 idx, i, j, k;
+	s32 power;
+	s8 val;
+
+	if (sar->type != NL80211_SAR_TYPE_POWER)
+		return -EINVAL;
+
+	memset(&new, rtwdev->chip->max_power_index, sizeof(new));
+	new.src = RTW_SAR_SOURCE_COMMON;
+
+	for (i = 0; i < sar->num_sub_specs; i++) {
+		idx = sar->sub_specs[i].freq_range_index;
+		if (idx >= RTW_SAR_BAND_NR)
+			return -EINVAL;
+
+		power = sar->sub_specs[i].power;
+		rtw_dbg(rtwdev, RTW_DBG_REGD, "On freq %u to %u, set SAR %d in 1/%lu dBm\n",
+			rtw_common_sar_freq_ranges[idx].start_freq,
+			rtw_common_sar_freq_ranges[idx].end_freq,
+			power, BIT(RTW_COMMON_SAR_FCT));
+
+		for (j = 0; j < RTW_RF_PATH_MAX; j++) {
+			for (k = 0; k < RTW_RATE_SECTION_MAX; k++) {
+				arg = (struct rtw_sar_arg){
+					.sar_band = idx,
+					.path = j,
+					.rs = k,
+				};
+				val = rtw_sar_to_phy(rtwdev, RTW_COMMON_SAR_FCT,
+						     power, &arg);
+				new.cfg[j][k].common[idx] = val;
+			}
+		}
+	}
+
+	return rtw_apply_sar(rtwdev, &new);
+}