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// SPDX-License-Identifier: ISC
/* Copyright (C) 2022 MediaTek Inc. */
#include <linux/acpi.h>
#include "mt7921.h"
static int
mt7921_acpi_read(struct mt7921_dev *dev, u8 *method, u8 **tbl, u32 *len)
{
struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER, NULL };
union acpi_object *sar_root, *sar_unit;
struct mt76_dev *mdev = &dev->mt76;
acpi_handle root, handle;
acpi_status status;
u32 i = 0;
int ret;
root = ACPI_HANDLE(mdev->dev);
if (!root)
return -EOPNOTSUPP;
status = acpi_get_handle(root, method, &handle);
if (ACPI_FAILURE(status))
return -EIO;
status = acpi_evaluate_object(handle, NULL, NULL, &buf);
if (ACPI_FAILURE(status))
return -EIO;
sar_root = buf.pointer;
if (sar_root->type != ACPI_TYPE_PACKAGE ||
sar_root->package.count < 4 ||
sar_root->package.elements[0].type != ACPI_TYPE_INTEGER) {
dev_err(mdev->dev, "sar cnt = %d\n",
sar_root->package.count);
goto free;
}
if (!*tbl) {
*tbl = devm_kzalloc(mdev->dev, sar_root->package.count,
GFP_KERNEL);
if (!*tbl)
goto free;
}
if (len)
*len = sar_root->package.count;
for (i = 0; i < sar_root->package.count; i++) {
sar_unit = &sar_root->package.elements[i];
if (sar_unit->type != ACPI_TYPE_INTEGER)
break;
*(*tbl + i) = (u8)sar_unit->integer.value;
}
free:
ret = (i == sar_root->package.count) ? 0 : -EINVAL;
kfree(sar_root);
return ret;
}
/* MTCL : Country List Table for 6G band */
static int
mt7921_asar_acpi_read_mtcl(struct mt7921_dev *dev, u8 **table, u8 *version)
{
*version = (mt7921_acpi_read(dev, MT7921_ACPI_MTCL, table, NULL) < 0)
? 1 : 2;
return 0;
}
/* MTDS : Dynamic SAR Power Table */
static int
mt7921_asar_acpi_read_mtds(struct mt7921_dev *dev, u8 **table, u8 version)
{
int len, ret, sarlen, prelen, tblcnt;
bool enable;
ret = mt7921_acpi_read(dev, MT7921_ACPI_MTDS, table, &len);
if (ret)
return ret;
/* Table content validation */
switch (version) {
case 1:
enable = ((struct mt7921_asar_dyn *)*table)->enable;
sarlen = sizeof(struct mt7921_asar_dyn_limit);
prelen = sizeof(struct mt7921_asar_dyn);
break;
case 2:
enable = ((struct mt7921_asar_dyn_v2 *)*table)->enable;
sarlen = sizeof(struct mt7921_asar_dyn_limit_v2);
prelen = sizeof(struct mt7921_asar_dyn_v2);
break;
default:
return -EINVAL;
}
tblcnt = (len - prelen) / sarlen;
if (!enable ||
tblcnt > MT7921_ASAR_MAX_DYN || tblcnt < MT7921_ASAR_MIN_DYN)
ret = -EINVAL;
return ret;
}
/* MTGS : Geo SAR Power Table */
static int
mt7921_asar_acpi_read_mtgs(struct mt7921_dev *dev, u8 **table, u8 version)
{
int len, ret = 0, sarlen, prelen, tblcnt;
ret = mt7921_acpi_read(dev, MT7921_ACPI_MTGS, table, &len);
if (ret)
return ret;
/* Table content validation */
switch (version) {
case 1:
sarlen = sizeof(struct mt7921_asar_geo_limit);
prelen = sizeof(struct mt7921_asar_geo);
break;
case 2:
sarlen = sizeof(struct mt7921_asar_geo_limit_v2);
prelen = sizeof(struct mt7921_asar_geo_v2);
break;
default:
return -EINVAL;
}
tblcnt = (len - prelen) / sarlen;
if (tblcnt > MT7921_ASAR_MAX_GEO || tblcnt < MT7921_ASAR_MIN_GEO)
ret = -EINVAL;
return ret;
}
int mt7921_init_acpi_sar(struct mt7921_dev *dev)
{
struct mt7921_acpi_sar *asar;
int ret;
asar = devm_kzalloc(dev->mt76.dev, sizeof(*asar), GFP_KERNEL);
if (!asar)
return -ENOMEM;
mt7921_asar_acpi_read_mtcl(dev, (u8 **)&asar->countrylist, &asar->ver);
/* MTDS is mandatory. Return error if table is invalid */
ret = mt7921_asar_acpi_read_mtds(dev, (u8 **)&asar->dyn, asar->ver);
if (ret) {
devm_kfree(dev->mt76.dev, asar->dyn);
devm_kfree(dev->mt76.dev, asar->countrylist);
devm_kfree(dev->mt76.dev, asar);
return ret;
}
/* MTGS is optional */
ret = mt7921_asar_acpi_read_mtgs(dev, (u8 **)&asar->geo, asar->ver);
if (ret) {
devm_kfree(dev->mt76.dev, asar->geo);
asar->geo = NULL;
}
dev->phy.acpisar = asar;
return 0;
}
static s8
mt7921_asar_get_geo_pwr(struct mt7921_phy *phy,
enum nl80211_band band, s8 dyn_power)
{
struct mt7921_acpi_sar *asar = phy->acpisar;
struct mt7921_asar_geo_band *band_pwr;
s8 geo_power;
u8 idx, max;
if (!asar->geo)
return dyn_power;
switch (phy->mt76->dev->region) {
case NL80211_DFS_FCC:
idx = 0;
break;
case NL80211_DFS_ETSI:
idx = 1;
break;
default: /* WW */
idx = 2;
break;
}
if (asar->ver == 1) {
band_pwr = &asar->geo->tbl[idx].band[0];
max = ARRAY_SIZE(asar->geo->tbl[idx].band);
} else {
band_pwr = &asar->geo_v2->tbl[idx].band[0];
max = ARRAY_SIZE(asar->geo_v2->tbl[idx].band);
}
switch (band) {
case NL80211_BAND_2GHZ:
idx = 0;
break;
case NL80211_BAND_5GHZ:
idx = 1;
break;
case NL80211_BAND_6GHZ:
idx = 2;
break;
default:
return dyn_power;
}
if (idx >= max)
return dyn_power;
geo_power = (band_pwr + idx)->pwr;
dyn_power += (band_pwr + idx)->offset;
return min(geo_power, dyn_power);
}
static s8
mt7921_asar_range_pwr(struct mt7921_phy *phy,
const struct cfg80211_sar_freq_ranges *range,
u8 idx)
{
const struct cfg80211_sar_capa *capa = phy->mt76->hw->wiphy->sar_capa;
struct mt7921_acpi_sar *asar = phy->acpisar;
u8 *limit, band, max;
if (!capa)
return 127;
if (asar->ver == 1) {
limit = &asar->dyn->tbl[0].frp[0];
max = ARRAY_SIZE(asar->dyn->tbl[0].frp);
} else {
limit = &asar->dyn_v2->tbl[0].frp[0];
max = ARRAY_SIZE(asar->dyn_v2->tbl[0].frp);
}
if (idx >= max)
return 127;
if (range->start_freq >= 5945)
band = NL80211_BAND_6GHZ;
else if (range->start_freq >= 5150)
band = NL80211_BAND_5GHZ;
else
band = NL80211_BAND_2GHZ;
return mt7921_asar_get_geo_pwr(phy, band, limit[idx]);
}
int mt7921_init_acpi_sar_power(struct mt7921_phy *phy, bool set_default)
{
const struct cfg80211_sar_capa *capa = phy->mt76->hw->wiphy->sar_capa;
int i;
if (!phy->acpisar)
return 0;
/* When ACPI SAR enabled in HW, we should apply rules for .frp
* 1. w/o .sar_specs : set ACPI SAR power as the defatul value
* 2. w/ .sar_specs : set power with min(.sar_specs, ACPI_SAR)
*/
for (i = 0; i < capa->num_freq_ranges; i++) {
struct mt76_freq_range_power *frp = &phy->mt76->frp[i];
frp->range = set_default ? &capa->freq_ranges[i] : frp->range;
if (!frp->range)
continue;
frp->power = min_t(s8, set_default ? 127 : frp->power,
mt7921_asar_range_pwr(phy, frp->range, i));
}
return 0;
}
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