/*
* intel_pmic.c - Intel PMIC operation region driver
*
* Copyright (C) 2014 Intel Corporation. All rights reserved.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License version
* 2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <linux/module.h>
#include <linux/acpi.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
struct intel_pmic_opregion {
struct mutex lock;
struct acpi_lpat_conversion_table *lpat_table;
struct regmap *regmap;
struct intel_pmic_opregion_data *data;
};
static int pmic_get_reg_bit(int address, 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;
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 = acpi_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,
u32 function, u64 *value)
{
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, value);
if (*value != 0 && *value != 1)
return -EINVAL;
return d->update_policy(regmap, reg, *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;
struct intel_pmic_opregion_data *d = opregion->data;
int reg, result;
if (bits != 32 || !value64)
return AE_BAD_PARAMETER;
result = pmic_get_reg_bit(address, d->thermal_table,
d->thermal_table_count, ®, NULL);
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, 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;
}
int intel_pmic_install_opregion_handler(struct device *dev, acpi_handle handle,
struct regmap *regmap,
struct intel_pmic_opregion_data *d)
{
acpi_status status;
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);
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;
}
status = acpi_install_address_space_handler(handle,
PMIC_THERMAL_OPREGION_ID,
intel_pmic_thermal_handler,
NULL, opregion);
if (ACPI_FAILURE(status)) {
acpi_remove_address_space_handler(handle, PMIC_POWER_OPREGION_ID,
intel_pmic_power_handler);
ret = -ENODEV;
goto out_error;
}
opregion->data = d;
return 0;
out_error:
acpi_lpat_free_conversion_table(opregion->lpat_table);
return ret;
}
EXPORT_SYMBOL_GPL(intel_pmic_install_opregion_handler);
MODULE_LICENSE("GPL");
Stefan K. Berg <stefan.k.berg@ericsson.com>