linux/drivers/acpi/pmic/intel_pmic_xpower.c
Aaron Lu 491cb357de ACPI / PMIC: AXP288: support virtual GPIO in ACPI table
The same virtual GPIO strategy is also used for the AXP288 PMIC in that
various control methods that are used to do power rail handling and
sensor reading/setting will touch GPIO fields defined under the PMIC
device. The GPIO fileds are only defined by the ACPI code while the
actual hardware doesn't really have a GPIO controller, but to make those
control method execution succeed, we have to install a GPIO handler for
the PMIC device handle. Since we do not need the virtual GPIO strategy,
we can simply do nothing in that handler.

Signed-off-by: Aaron Lu <aaron.lu@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2014-11-26 23:32:06 +01:00

269 lines
5.3 KiB
C

/*
* intel_pmic_xpower.c - XPower AXP288 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/mfd/axp20x.h>
#include <linux/regmap.h>
#include <linux/platform_device.h>
#include <linux/iio/consumer.h>
#include "intel_pmic.h"
#define XPOWER_GPADC_LOW 0x5b
static struct pmic_table power_table[] = {
{
.address = 0x00,
.reg = 0x13,
.bit = 0x05,
},
{
.address = 0x04,
.reg = 0x13,
.bit = 0x06,
},
{
.address = 0x08,
.reg = 0x13,
.bit = 0x07,
},
{
.address = 0x0c,
.reg = 0x12,
.bit = 0x03,
},
{
.address = 0x10,
.reg = 0x12,
.bit = 0x04,
},
{
.address = 0x14,
.reg = 0x12,
.bit = 0x05,
},
{
.address = 0x18,
.reg = 0x12,
.bit = 0x06,
},
{
.address = 0x1c,
.reg = 0x12,
.bit = 0x00,
},
{
.address = 0x20,
.reg = 0x12,
.bit = 0x01,
},
{
.address = 0x24,
.reg = 0x12,
.bit = 0x02,
},
{
.address = 0x28,
.reg = 0x13,
.bit = 0x02,
},
{
.address = 0x2c,
.reg = 0x13,
.bit = 0x03,
},
{
.address = 0x30,
.reg = 0x13,
.bit = 0x04,
},
{
.address = 0x38,
.reg = 0x10,
.bit = 0x03,
},
{
.address = 0x3c,
.reg = 0x10,
.bit = 0x06,
},
{
.address = 0x40,
.reg = 0x10,
.bit = 0x05,
},
{
.address = 0x44,
.reg = 0x10,
.bit = 0x04,
},
{
.address = 0x48,
.reg = 0x10,
.bit = 0x01,
},
{
.address = 0x4c,
.reg = 0x10,
.bit = 0x00
},
};
/* TMP0 - TMP5 are the same, all from GPADC */
static struct pmic_table thermal_table[] = {
{
.address = 0x00,
.reg = XPOWER_GPADC_LOW
},
{
.address = 0x0c,
.reg = XPOWER_GPADC_LOW
},
{
.address = 0x18,
.reg = XPOWER_GPADC_LOW
},
{
.address = 0x24,
.reg = XPOWER_GPADC_LOW
},
{
.address = 0x30,
.reg = XPOWER_GPADC_LOW
},
{
.address = 0x3c,
.reg = XPOWER_GPADC_LOW
},
};
static int intel_xpower_pmic_get_power(struct regmap *regmap, int reg,
int bit, u64 *value)
{
int data;
if (regmap_read(regmap, reg, &data))
return -EIO;
*value = (data & BIT(bit)) ? 1 : 0;
return 0;
}
static int intel_xpower_pmic_update_power(struct regmap *regmap, int reg,
int bit, bool on)
{
int data;
if (regmap_read(regmap, reg, &data))
return -EIO;
if (on)
data |= BIT(bit);
else
data &= ~BIT(bit);
if (regmap_write(regmap, reg, data))
return -EIO;
return 0;
}
/**
* intel_xpower_pmic_get_raw_temp(): Get raw temperature reading from the PMIC
*
* @regmap: regmap of the PMIC device
* @reg: register to get the reading
*
* We could get the sensor value by manipulating the HW regs here, but since
* the axp288 IIO driver may also access the same regs at the same time, the
* APIs provided by IIO subsystem are used here instead to avoid problems. As
* a result, the two passed in params are of no actual use.
*
* Return a positive value on success, errno on failure.
*/
static int intel_xpower_pmic_get_raw_temp(struct regmap *regmap, int reg)
{
struct iio_channel *gpadc_chan;
int ret, val;
gpadc_chan = iio_channel_get(NULL, "axp288-system-temp");
if (IS_ERR_OR_NULL(gpadc_chan))
return -EACCES;
ret = iio_read_channel_raw(gpadc_chan, &val);
if (ret < 0)
val = ret;
iio_channel_release(gpadc_chan);
return val;
}
static struct intel_pmic_opregion_data intel_xpower_pmic_opregion_data = {
.get_power = intel_xpower_pmic_get_power,
.update_power = intel_xpower_pmic_update_power,
.get_raw_temp = intel_xpower_pmic_get_raw_temp,
.power_table = power_table,
.power_table_count = ARRAY_SIZE(power_table),
.thermal_table = thermal_table,
.thermal_table_count = ARRAY_SIZE(thermal_table),
};
static acpi_status intel_xpower_pmic_gpio_handler(u32 function,
acpi_physical_address address, u32 bit_width, u64 *value,
void *handler_context, void *region_context)
{
return AE_OK;
}
static int intel_xpower_pmic_opregion_probe(struct platform_device *pdev)
{
struct device *parent = pdev->dev.parent;
struct axp20x_dev *axp20x = dev_get_drvdata(parent);
acpi_status status;
int result;
status = acpi_install_address_space_handler(ACPI_HANDLE(parent),
ACPI_ADR_SPACE_GPIO, intel_xpower_pmic_gpio_handler,
NULL, NULL);
if (ACPI_FAILURE(status))
return -ENODEV;
result = intel_pmic_install_opregion_handler(&pdev->dev,
ACPI_HANDLE(parent), axp20x->regmap,
&intel_xpower_pmic_opregion_data);
if (result)
acpi_remove_address_space_handler(ACPI_HANDLE(parent),
ACPI_ADR_SPACE_GPIO,
intel_xpower_pmic_gpio_handler);
return result;
}
static struct platform_driver intel_xpower_pmic_opregion_driver = {
.probe = intel_xpower_pmic_opregion_probe,
.driver = {
.name = "axp288_pmic_acpi",
},
};
static int __init intel_xpower_pmic_opregion_driver_init(void)
{
return platform_driver_register(&intel_xpower_pmic_opregion_driver);
}
module_init(intel_xpower_pmic_opregion_driver_init);
MODULE_DESCRIPTION("XPower AXP288 ACPI operation region driver");
MODULE_LICENSE("GPL");