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linux/drivers/regulator/act8945a-regulator.c

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/*
* Voltage regulation driver for active-semi ACT8945A PMIC
*
* Copyright (C) 2015 Atmel Corporation
*
* Author: Wenyou Yang <wenyou.yang@atmel.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of the
* License, or (at your option) any later version.
*
*/
#include <linux/module.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/machine.h>
#include <dt-bindings/regulator/active-semi,8945a-regulator.h>
/**
* ACT8945A Global Register Map.
*/
#define ACT8945A_SYS_MODE 0x00
#define ACT8945A_SYS_CTRL 0x01
#define ACT8945A_SYS_UNLK_REGS 0x0b
#define ACT8945A_DCDC1_VSET1 0x20
#define ACT8945A_DCDC1_VSET2 0x21
#define ACT8945A_DCDC1_CTRL 0x22
#define ACT8945A_DCDC1_SUS 0x24
#define ACT8945A_DCDC2_VSET1 0x30
#define ACT8945A_DCDC2_VSET2 0x31
#define ACT8945A_DCDC2_CTRL 0x32
#define ACT8945A_DCDC2_SUS 0x34
#define ACT8945A_DCDC3_VSET1 0x40
#define ACT8945A_DCDC3_VSET2 0x41
#define ACT8945A_DCDC3_CTRL 0x42
#define ACT8945A_DCDC3_SUS 0x44
#define ACT8945A_LDO1_VSET 0x50
#define ACT8945A_LDO1_CTRL 0x51
#define ACT8945A_LDO1_SUS 0x52
#define ACT8945A_LDO2_VSET 0x54
#define ACT8945A_LDO2_CTRL 0x55
#define ACT8945A_LDO2_SUS 0x56
#define ACT8945A_LDO3_VSET 0x60
#define ACT8945A_LDO3_CTRL 0x61
#define ACT8945A_LDO3_SUS 0x62
#define ACT8945A_LDO4_VSET 0x64
#define ACT8945A_LDO4_CTRL 0x65
#define ACT8945A_LDO4_SUS 0x66
/**
* Field Definitions.
*/
#define ACT8945A_ENA 0x80 /* ON - [7] */
#define ACT8945A_VSEL_MASK 0x3F /* VSET - [5:0] */
/**
* ACT8945A Voltage Number
*/
#define ACT8945A_VOLTAGE_NUM 64
enum {
ACT8945A_ID_DCDC1,
ACT8945A_ID_DCDC2,
ACT8945A_ID_DCDC3,
ACT8945A_ID_LDO1,
ACT8945A_ID_LDO2,
ACT8945A_ID_LDO3,
ACT8945A_ID_LDO4,
ACT8945A_ID_MAX,
};
struct act8945a_pmic {
struct regmap *regmap;
u32 op_mode[ACT8945A_ID_MAX];
};
static const struct regulator_linear_range act8945a_voltage_ranges[] = {
REGULATOR_LINEAR_RANGE(600000, 0, 23, 25000),
REGULATOR_LINEAR_RANGE(1200000, 24, 47, 50000),
REGULATOR_LINEAR_RANGE(2400000, 48, 63, 100000),
};
static int act8945a_set_suspend_state(struct regulator_dev *rdev, bool enable)
{
struct regmap *regmap = rdev->regmap;
int id = rdev->desc->id, reg, val;
switch (id) {
case ACT8945A_ID_DCDC1:
reg = ACT8945A_DCDC1_SUS;
val = 0xa8;
break;
case ACT8945A_ID_DCDC2:
reg = ACT8945A_DCDC2_SUS;
val = 0xa8;
break;
case ACT8945A_ID_DCDC3:
reg = ACT8945A_DCDC3_SUS;
val = 0xa8;
break;
case ACT8945A_ID_LDO1:
reg = ACT8945A_LDO1_SUS;
val = 0xe8;
break;
case ACT8945A_ID_LDO2:
reg = ACT8945A_LDO2_SUS;
val = 0xe8;
break;
case ACT8945A_ID_LDO3:
reg = ACT8945A_LDO3_SUS;
val = 0xe8;
break;
case ACT8945A_ID_LDO4:
reg = ACT8945A_LDO4_SUS;
val = 0xe8;
break;
default:
return -EINVAL;
}
if (enable)
val |= BIT(4);
/*
* Ask the PMIC to enable/disable this output when entering hibernate
* mode.
*/
return regmap_write(regmap, reg, val);
}
static int act8945a_set_suspend_enable(struct regulator_dev *rdev)
{
return act8945a_set_suspend_state(rdev, true);
}
static int act8945a_set_suspend_disable(struct regulator_dev *rdev)
{
return act8945a_set_suspend_state(rdev, false);
}
static unsigned int act8945a_of_map_mode(unsigned int mode)
{
switch (mode) {
case ACT8945A_REGULATOR_MODE_FIXED:
case ACT8945A_REGULATOR_MODE_NORMAL:
return REGULATOR_MODE_NORMAL;
case ACT8945A_REGULATOR_MODE_LOWPOWER:
return REGULATOR_MODE_STANDBY;
default:
return REGULATOR_MODE_INVALID;
}
}
static int act8945a_set_mode(struct regulator_dev *rdev, unsigned int mode)
{
struct act8945a_pmic *act8945a = rdev_get_drvdata(rdev);
struct regmap *regmap = rdev->regmap;
int id = rdev->desc->id;
int reg, ret, val = 0;
switch (id) {
case ACT8945A_ID_DCDC1:
reg = ACT8945A_DCDC1_CTRL;
break;
case ACT8945A_ID_DCDC2:
reg = ACT8945A_DCDC2_CTRL;
break;
case ACT8945A_ID_DCDC3:
reg = ACT8945A_DCDC3_CTRL;
break;
case ACT8945A_ID_LDO1:
reg = ACT8945A_LDO1_SUS;
break;
case ACT8945A_ID_LDO2:
reg = ACT8945A_LDO2_SUS;
break;
case ACT8945A_ID_LDO3:
reg = ACT8945A_LDO3_SUS;
break;
case ACT8945A_ID_LDO4:
reg = ACT8945A_LDO4_SUS;
break;
default:
return -EINVAL;
}
switch (mode) {
case REGULATOR_MODE_STANDBY:
if (rdev->desc->id > ACT8945A_ID_DCDC3)
val = BIT(5);
break;
case REGULATOR_MODE_NORMAL:
if (rdev->desc->id <= ACT8945A_ID_DCDC3)
val = BIT(5);
break;
default:
return -EINVAL;
}
ret = regmap_update_bits(regmap, reg, BIT(5), val);
if (ret)
return ret;
act8945a->op_mode[id] = mode;
return 0;
}
static unsigned int act8945a_get_mode(struct regulator_dev *rdev)
{
struct act8945a_pmic *act8945a = rdev_get_drvdata(rdev);
int id = rdev->desc->id;
if (id < ACT8945A_ID_DCDC1 || id >= ACT8945A_ID_MAX)
return -EINVAL;
return act8945a->op_mode[id];
}
static const struct regulator_ops act8945a_ops = {
.list_voltage = regulator_list_voltage_linear_range,
.map_voltage = regulator_map_voltage_linear_range,
.get_voltage_sel = regulator_get_voltage_sel_regmap,
.set_voltage_sel = regulator_set_voltage_sel_regmap,
.enable = regulator_enable_regmap,
.disable = regulator_disable_regmap,
.set_mode = act8945a_set_mode,
.get_mode = act8945a_get_mode,
.is_enabled = regulator_is_enabled_regmap,
.set_suspend_enable = act8945a_set_suspend_enable,
.set_suspend_disable = act8945a_set_suspend_disable,
};
#define ACT89xx_REG(_name, _family, _id, _vsel_reg, _supply) \
[_family##_ID_##_id] = { \
.name = _name, \
.supply_name = _supply, \
.of_match = of_match_ptr("REG_"#_id), \
.of_map_mode = act8945a_of_map_mode, \
.regulators_node = of_match_ptr("regulators"), \
.id = _family##_ID_##_id, \
.type = REGULATOR_VOLTAGE, \
.ops = &act8945a_ops, \
.n_voltages = ACT8945A_VOLTAGE_NUM, \
.linear_ranges = act8945a_voltage_ranges, \
.n_linear_ranges = ARRAY_SIZE(act8945a_voltage_ranges), \
.vsel_reg = _family##_##_id##_##_vsel_reg, \
.vsel_mask = ACT8945A_VSEL_MASK, \
.enable_reg = _family##_##_id##_CTRL, \
.enable_mask = ACT8945A_ENA, \
.owner = THIS_MODULE, \
}
static const struct regulator_desc act8945a_regulators[] = {
ACT89xx_REG("DCDC_REG1", ACT8945A, DCDC1, VSET1, "vp1"),
ACT89xx_REG("DCDC_REG2", ACT8945A, DCDC2, VSET1, "vp2"),
ACT89xx_REG("DCDC_REG3", ACT8945A, DCDC3, VSET1, "vp3"),
ACT89xx_REG("LDO_REG1", ACT8945A, LDO1, VSET, "inl45"),
ACT89xx_REG("LDO_REG2", ACT8945A, LDO2, VSET, "inl45"),
ACT89xx_REG("LDO_REG3", ACT8945A, LDO3, VSET, "inl67"),
ACT89xx_REG("LDO_REG4", ACT8945A, LDO4, VSET, "inl67"),
};
static const struct regulator_desc act8945a_alt_regulators[] = {
ACT89xx_REG("DCDC_REG1", ACT8945A, DCDC1, VSET2, "vp1"),
ACT89xx_REG("DCDC_REG2", ACT8945A, DCDC2, VSET2, "vp2"),
ACT89xx_REG("DCDC_REG3", ACT8945A, DCDC3, VSET2, "vp3"),
ACT89xx_REG("LDO_REG1", ACT8945A, LDO1, VSET, "inl45"),
ACT89xx_REG("LDO_REG2", ACT8945A, LDO2, VSET, "inl45"),
ACT89xx_REG("LDO_REG3", ACT8945A, LDO3, VSET, "inl67"),
ACT89xx_REG("LDO_REG4", ACT8945A, LDO4, VSET, "inl67"),
};
static int act8945a_pmic_probe(struct platform_device *pdev)
{
struct regulator_config config = { };
const struct regulator_desc *regulators;
struct act8945a_pmic *act8945a;
struct regulator_dev *rdev;
int i, num_regulators;
bool voltage_select;
act8945a = devm_kzalloc(&pdev->dev, sizeof(*act8945a), GFP_KERNEL);
if (!act8945a)
return -ENOMEM;
act8945a->regmap = dev_get_regmap(pdev->dev.parent, NULL);
if (!act8945a->regmap) {
dev_err(&pdev->dev,
"could not retrieve regmap from parent device\n");
return -EINVAL;
}
voltage_select = of_property_read_bool(pdev->dev.parent->of_node,
"active-semi,vsel-high");
if (voltage_select) {
regulators = act8945a_alt_regulators;
num_regulators = ARRAY_SIZE(act8945a_alt_regulators);
} else {
regulators = act8945a_regulators;
num_regulators = ARRAY_SIZE(act8945a_regulators);
}
config.dev = &pdev->dev;
config.dev->of_node = pdev->dev.parent->of_node;
config.driver_data = act8945a;
for (i = 0; i < num_regulators; i++) {
rdev = devm_regulator_register(&pdev->dev, &regulators[i],
&config);
if (IS_ERR(rdev)) {
dev_err(&pdev->dev,
"failed to register %s regulator\n",
regulators[i].name);
return PTR_ERR(rdev);
}
}
platform_set_drvdata(pdev, act8945a);
/* Unlock expert registers. */
return regmap_write(act8945a->regmap, ACT8945A_SYS_UNLK_REGS, 0xef);
}
static int __maybe_unused act8945a_suspend(struct device *pdev)
{
struct act8945a_pmic *act8945a = dev_get_drvdata(pdev);
/*
* Ask the PMIC to enter the suspend mode on the next PWRHLD
* transition.
*/
return regmap_write(act8945a->regmap, ACT8945A_SYS_CTRL, 0x42);
}
static SIMPLE_DEV_PM_OPS(act8945a_pm, act8945a_suspend, NULL);
static void act8945a_pmic_shutdown(struct platform_device *pdev)
{
struct act8945a_pmic *act8945a = platform_get_drvdata(pdev);
/*
* Ask the PMIC to shutdown everything on the next PWRHLD transition.
*/
regmap_write(act8945a->regmap, ACT8945A_SYS_CTRL, 0x0);
}
static struct platform_driver act8945a_pmic_driver = {
.driver = {
.name = "act8945a-regulator",
.pm = &act8945a_pm,
},
.probe = act8945a_pmic_probe,
.shutdown = act8945a_pmic_shutdown,
};
module_platform_driver(act8945a_pmic_driver);
MODULE_DESCRIPTION("Active-semi ACT8945A voltage regulator driver");
MODULE_AUTHOR("Wenyou Yang <wenyou.yang@atmel.com>");
MODULE_LICENSE("GPL");
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