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// 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_info(rtwdev, "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);
}
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