// SPDX-License-Identifier: GPL-2.0-only
/*
* intel_pmic.c - Intel PMIC operation region driver
*
* Copyright (C) 2014 Intel Corporation. All rights reserved.
*/
#include <linux/export.h>
#include <linux/acpi.h>
#include <linux/mfd/intel_soc_pmic.h>
#include <linux/regmap.h>
#include <acpi/acpi_lpat.h>
#include "intel_pmic.h"
#define PMIC_POWER_OPREGION_ID 0x8d
#define PMIC_THERMAL_OPREGION_ID 0x8c
#define PMIC_REGS_OPREGION_ID 0x8f
struct intel_pmic_regs_handler_ctx {
unsigned int val;
u16 addr;
};
struct intel_pmic_opregion {
struct mutex lock;
struct acpi_lpat_conversion_table *lpat_table;
struct regmap *regmap;
const struct intel_pmic_opregion_data *data;
struct intel_pmic_regs_handler_ctx ctx;
};
static struct intel_pmic_opregion *intel_pmic_opregion;
static int pmic_get_reg_bit(int address, const struct pmic_table *table,
int count, int *reg, int *bit)
{
int i;
for (i = 0; i < count; i++) {
if (table[i].address == address) {
*reg = table[i].reg;
if (bit)
*bit = table[i].bit;
return 0;
}
}
return -ENOENT;
}
static acpi_status intel_pmic_power_handler(u32 function,
acpi_physical_address address, u32 bits, u64 *value64,
void *handler_context, void *region_context)
{
struct intel_pmic_opregion *opregion = region_context;
struct regmap *regmap = opregion->regmap;
const struct intel_pmic_opregion_data *d = opregion->data;
int reg, bit, result;
if (bits != 32 || !value64)
return AE_BAD_PARAMETER;
if (function == ACPI_WRITE && !(*value64 == 0 || *value64 == 1))
return AE_BAD_PARAMETER;
result = pmic_get_reg_bit(address, d->power_table,
d->power_table_count, ®, &bit);
if (result == -ENOENT)
return AE_BAD_PARAMETER;
mutex_lock(&opregion->lock);
result = function == ACPI_READ ?
d->get_power(regmap, reg, bit, value64) :
d->update_power(regmap, reg, bit, *value64 == 1);
mutex_unlock(&opregion->lock);
return result ? AE_ERROR : AE_OK;
}
static int pmic_read_temp(struct intel_pmic_opregion *opregion,
int reg, u64 *value)
{
int raw_temp, temp;
if (!opregion->data->get_raw_temp)
return -ENXIO;
raw_temp = opregion->data->get_raw_temp(opregion->regmap, reg);
if (raw_temp < 0)
return raw_temp;
if (!opregion->lpat_table) {
*value = raw_temp;
return 0;
}
temp = opregion->data->lpat_raw_to_temp(opregion->lpat_table, raw_temp);
if (temp < 0)
return temp;
*value = temp;
return 0;
}
static int pmic_thermal_temp(struct intel_pmic_opregion *opregion, int reg,
u32 function, u64 *value)
{
return function == ACPI_READ ?
pmic_read_temp(opregion, reg, value) : -EINVAL;
}
static int pmic_thermal_aux(struct intel_pmic_opregion *opregion, int reg,
u32 function, u64 *value)
{
int raw_temp;
if (function == ACPI_READ)
return pmic_read_temp(opregion, reg, value);
if (!opregion->data->update_aux)
return -ENXIO;
if (opregion->lpat_table) {
raw_temp = acpi_lpat_temp_to_raw(opregion->lpat_table, *value);
if (raw_temp < 0)
return raw_temp;
} else {
raw_temp = *value;
}
return opregion->data->update_aux(opregion->regmap, reg, raw_temp);
}
static int pmic_thermal_pen(struct intel_pmic_opregion *opregion, int reg,
int bit, u32 function, u64 *value)
{
const struct intel_pmic_opregion_data *d = opregion->data;
struct regmap *regmap = opregion->regmap;
if (!d->get_policy || !d->update_policy)
return -ENXIO;
if (function == ACPI_READ)
return d->get_policy(regmap, reg, bit, value);
if (*value != 0 && *value != 1)
return -EINVAL;
return d->update_policy(regmap, reg, bit, *value);
}
static bool pmic_thermal_is_temp(int address)
{
return (address <= 0x3c) && !(address % 12);
}
static bool pmic_thermal_is_aux(int address)
{
return (address >= 4 && address <= 0x40 && !((address - 4) % 12)) ||
(address >= 8 && address <= 0x44 && !((address - 8) % 12));
}
static bool pmic_thermal_is_pen(int address)
{
return address >= 0x48 && address <= 0x5c;
}
static acpi_status intel_pmic_thermal_handler(u32 function,
acpi_physical_address address, u32 bits, u64 *value64,
void *handler_context, void *region_context)
{
struct intel_pmic_opregion *opregion = region_context;
const struct intel_pmic_opregion_data *d = opregion->data;
int reg, bit, result;
if (bits != 32 || !value64)
return AE_BAD_PARAMETER;
result = pmic_get_reg_bit(address, d->thermal_table,
d->thermal_table_count, ®, &bit);
if (result == -ENOENT)
return AE_BAD_PARAMETER;
mutex_lock(&opregion->lock);
if (pmic_thermal_is_temp(address))
result = pmic_thermal_temp(opregion, reg, function, value64);
else if (pmic_thermal_is_aux(address))
result = pmic_thermal_aux(opregion, reg, function, value64);
else if (pmic_thermal_is_pen(address))
result = pmic_thermal_pen(opregion, reg, bit,
function, value64);
else
result = -EINVAL;
mutex_unlock(&opregion->lock);
if (result < 0) {
if (result == -EINVAL)
return AE_BAD_PARAMETER;
else
return AE_ERROR;
}
return AE_OK;
}
static acpi_status intel_pmic_regs_handler(u32 function,
acpi_physical_address address, u32 bits, u64 *value64,
void *handler_context, void *region_context)
{
struct intel_pmic_opregion *opregion = region_context;
int result = -EINVAL;
if (function == ACPI_WRITE) {
switch (address) {
case 0:
return AE_OK;
case 1:
opregion->ctx.addr |= (*value64 & 0xff) << 8;
return AE_OK;
case 2:
opregion->ctx.addr |= *value64 & 0xff;
return AE_OK;
case 3:
opregion->ctx.val = *value64 & 0xff;
return AE_OK;
case 4:
if (*value64) {
result = regmap_write(opregion->regmap, opregion->ctx.addr,
opregion->ctx.val);
} else {
result = regmap_read(opregion->regmap, opregion->ctx.addr,
&opregion->ctx.val);
}
opregion->ctx.addr = 0;
}
}
if (function == ACPI_READ && address == 3) {
*value64 = opregion->ctx.val;
return AE_OK;
}
if (result < 0) {
if (result == -EINVAL)
return AE_BAD_PARAMETER;
else
return AE_ERROR;
}
return AE_OK;
}
int intel_pmic_install_opregion_handler(struct device *dev, acpi_handle handle,
struct regmap *regmap,
const struct intel_pmic_opregion_data *d)
{
acpi_status status = AE_OK;
struct intel_pmic_opregion *opregion;
int ret;
if (!dev || !regmap || !d)
return -EINVAL;
if (!handle)
return -ENODEV;
opregion = devm_kzalloc(dev, sizeof(*opregion), GFP_KERNEL);
if (!opregion)
return -ENOMEM;
mutex_init(&opregion->lock);
opregion->regmap = regmap;
opregion->lpat_table = acpi_lpat_get_conversion_table(handle);
if (d->power_table_count)
status = acpi_install_address_space_handler(handle,
PMIC_POWER_OPREGION_ID,
intel_pmic_power_handler,
NULL, opregion);
if (ACPI_FAILURE(status)) {
ret = -ENODEV;
goto out_error;
}
if (d->thermal_table_count)
status = acpi_install_address_space_handler(handle,
PMIC_THERMAL_OPREGION_ID,
intel_pmic_thermal_handler,
NULL, opregion);
if (ACPI_FAILURE(status)) {
ret = -ENODEV;
goto out_remove_power_handler;
}
status = acpi_install_address_space_handler(handle,
PMIC_REGS_OPREGION_ID, intel_pmic_regs_handler, NULL,
opregion);
if (ACPI_FAILURE(status)) {
ret = -ENODEV;
goto out_remove_thermal_handler;
}
opregion->data = d;
intel_pmic_opregion = opregion;
return 0;
out_remove_thermal_handler:
if (d->thermal_table_count)
acpi_remove_address_space_handler(handle,
PMIC_THERMAL_OPREGION_ID,
intel_pmic_thermal_handler);
out_remove_power_handler:
if (d->power_table_count)
acpi_remove_address_space_handler(handle,
PMIC_POWER_OPREGION_ID,
intel_pmic_power_handler);
out_error:
acpi_lpat_free_conversion_table(opregion->lpat_table);
return ret;
}
EXPORT_SYMBOL_GPL(intel_pmic_install_opregion_handler);
/**
* intel_soc_pmic_exec_mipi_pmic_seq_element - Execute PMIC MIPI sequence
* @i2c_address: I2C client address for the PMIC
* @reg_address: PMIC register address
* @value: New value for the register bits to change
* @mask: Mask indicating which register bits to change
*
* DSI LCD panels describe an initialization sequence in the i915 VBT (Video
* BIOS Tables) using so called MIPI sequences. One possible element in these
* sequences is a PMIC specific element of 15 bytes.
*
* This function executes these PMIC specific elements sending the embedded
* commands to the PMIC.
*
* Return 0 on success, < 0 on failure.
*/
int intel_soc_pmic_exec_mipi_pmic_seq_element(u16 i2c_address, u32 reg_address,
u32 value, u32 mask)
{
const struct intel_pmic_opregion_data *d;
int ret;
if (!intel_pmic_opregion) {
pr_warn("%s: No PMIC registered\n", __func__);
return -ENXIO;
}
d = intel_pmic_opregion->data;
mutex_lock(&intel_pmic_opregion->lock);
if (d->exec_mipi_pmic_seq_element) {
ret = d->exec_mipi_pmic_seq_element(intel_pmic_opregion->regmap,
i2c_address, reg_address,
value, mask);
} else if (d->pmic_i2c_address) {
if (i2c_address == d->pmic_i2c_address) {
ret = regmap_update_bits(intel_pmic_opregion->regmap,
reg_address, mask, value);
} else {
pr_err("%s: Unexpected i2c-addr: 0x%02x (reg-addr 0x%x value 0x%x mask 0x%x)\n",
__func__, i2c_address, reg_address, value, mask);
ret = -ENXIO;
}
} else {
pr_warn("%s: Not implemented\n", __func__);
pr_warn("%s: i2c-addr: 0x%x reg-addr 0x%x value 0x%x mask 0x%x\n",
__func__, i2c_address, reg_address, value, mask);
ret = -EOPNOTSUPP;
}
mutex_unlock(&intel_pmic_opregion->lock);
return ret;
}
EXPORT_SYMBOL_GPL(intel_soc_pmic_exec_mipi_pmic_seq_element);
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