1/*
  2 * Voltage regulation driver for active-semi ACT8945A PMIC
  3 *
  4 * Copyright (C) 2015 Atmel Corporation
  5 *
  6 * Author: Wenyou Yang <wenyou.yang@atmel.com>
  7 *
  8 * This program is free software; you can redistribute it and/or
  9 * modify it under the terms of the GNU General Public License as
 10 * published by the Free Software Foundation; either version 2 of the
 11 * License, or (at your option) any later version.
 12 *
 13 */
 14
 15#include <linux/module.h>
 16#include <linux/of_device.h>
 17#include <linux/platform_device.h>
 18#include <linux/regulator/driver.h>
 19#include <linux/regulator/machine.h>
 20
 21/**
 22 * ACT8945A Global Register Map.
 23 */
 24#define ACT8945A_SYS_MODE	0x00
 25#define ACT8945A_SYS_CTRL	0x01
 26#define ACT8945A_DCDC1_VSET1	0x20
 27#define ACT8945A_DCDC1_VSET2	0x21
 28#define ACT8945A_DCDC1_CTRL	0x22
 29#define ACT8945A_DCDC2_VSET1	0x30
 30#define ACT8945A_DCDC2_VSET2	0x31
 31#define ACT8945A_DCDC2_CTRL	0x32
 32#define ACT8945A_DCDC3_VSET1	0x40
 33#define ACT8945A_DCDC3_VSET2	0x41
 34#define ACT8945A_DCDC3_CTRL	0x42
 35#define ACT8945A_LDO1_VSET	0x50
 36#define ACT8945A_LDO1_CTRL	0x51
 37#define ACT8945A_LDO2_VSET	0x54
 38#define ACT8945A_LDO2_CTRL	0x55
 39#define ACT8945A_LDO3_VSET	0x60
 40#define ACT8945A_LDO3_CTRL	0x61
 41#define ACT8945A_LDO4_VSET	0x64
 42#define ACT8945A_LDO4_CTRL	0x65
 43
 44/**
 45 * Field Definitions.
 46 */
 47#define ACT8945A_ENA		0x80	/* ON - [7] */
 48#define ACT8945A_VSEL_MASK	0x3F	/* VSET - [5:0] */
 49
 50/**
 51 * ACT8945A Voltage Number
 52 */
 53#define ACT8945A_VOLTAGE_NUM	64
 54
 55enum {
 56	ACT8945A_ID_DCDC1,
 57	ACT8945A_ID_DCDC2,
 58	ACT8945A_ID_DCDC3,
 59	ACT8945A_ID_LDO1,
 60	ACT8945A_ID_LDO2,
 61	ACT8945A_ID_LDO3,
 62	ACT8945A_ID_LDO4,
 63	ACT8945A_REG_NUM,
 64};
 65
 66static const struct regulator_linear_range act8945a_voltage_ranges[] = {
 67	REGULATOR_LINEAR_RANGE(600000, 0, 23, 25000),
 68	REGULATOR_LINEAR_RANGE(1200000, 24, 47, 50000),
 69	REGULATOR_LINEAR_RANGE(2400000, 48, 63, 100000),
 70};
 71
 72static struct regulator_ops act8945a_ops = {
 73	.list_voltage		= regulator_list_voltage_linear_range,
 74	.map_voltage		= regulator_map_voltage_linear_range,
 75	.get_voltage_sel	= regulator_get_voltage_sel_regmap,
 76	.set_voltage_sel	= regulator_set_voltage_sel_regmap,
 77	.enable			= regulator_enable_regmap,
 78	.disable		= regulator_disable_regmap,
 79	.is_enabled		= regulator_is_enabled_regmap,
 80};
 81
 82#define ACT89xx_REG(_name, _family, _id, _vsel_reg, _supply)		\
 83	[_family##_ID_##_id] = {					\
 84		.name			= _name,			\
 85		.supply_name		= _supply,			\
 86		.of_match		= of_match_ptr("REG_"#_id),	\
 87		.regulators_node	= of_match_ptr("regulators"),	\
 88		.id			= _family##_ID_##_id,		\
 89		.type			= REGULATOR_VOLTAGE,		\
 90		.ops			= &act8945a_ops,		\
 91		.n_voltages		= ACT8945A_VOLTAGE_NUM,		\
 92		.linear_ranges		= act8945a_voltage_ranges,	\
 93		.n_linear_ranges	= ARRAY_SIZE(act8945a_voltage_ranges), \
 94		.vsel_reg		= _family##_##_id##_##_vsel_reg, \
 95		.vsel_mask		= ACT8945A_VSEL_MASK,		\
 96		.enable_reg		= _family##_##_id##_CTRL,	\
 97		.enable_mask		= ACT8945A_ENA,			\
 98		.owner			= THIS_MODULE,			\
 99	}
100
101static const struct regulator_desc act8945a_regulators[] = {
102	ACT89xx_REG("DCDC_REG1", ACT8945A, DCDC1, VSET1, "vp1"),
103	ACT89xx_REG("DCDC_REG2", ACT8945A, DCDC2, VSET1, "vp2"),
104	ACT89xx_REG("DCDC_REG3", ACT8945A, DCDC3, VSET1, "vp3"),
105	ACT89xx_REG("LDO_REG1", ACT8945A, LDO1, VSET, "inl45"),
106	ACT89xx_REG("LDO_REG2", ACT8945A, LDO2, VSET, "inl45"),
107	ACT89xx_REG("LDO_REG3", ACT8945A, LDO3, VSET, "inl67"),
108	ACT89xx_REG("LDO_REG4", ACT8945A, LDO4, VSET, "inl67"),
109};
110
111static const struct regulator_desc act8945a_alt_regulators[] = {
112	ACT89xx_REG("DCDC_REG1", ACT8945A, DCDC1, VSET2, "vp1"),
113	ACT89xx_REG("DCDC_REG2", ACT8945A, DCDC2, VSET2, "vp2"),
114	ACT89xx_REG("DCDC_REG3", ACT8945A, DCDC3, VSET2, "vp3"),
115	ACT89xx_REG("LDO_REG1", ACT8945A, LDO1, VSET, "inl45"),
116	ACT89xx_REG("LDO_REG2", ACT8945A, LDO2, VSET, "inl45"),
117	ACT89xx_REG("LDO_REG3", ACT8945A, LDO3, VSET, "inl67"),
118	ACT89xx_REG("LDO_REG4", ACT8945A, LDO4, VSET, "inl67"),
119};
120
121static int act8945a_pmic_probe(struct platform_device *pdev)
122{
123	struct regulator_config config = { };
124	const struct regulator_desc *regulators;
125	struct regulator_dev *rdev;
126	int i, num_regulators;
127	bool voltage_select;
128
129	voltage_select = of_property_read_bool(pdev->dev.parent->of_node,
130					       "active-semi,vsel-high");
131
132	if (voltage_select) {
133		regulators = act8945a_alt_regulators;
134		num_regulators = ARRAY_SIZE(act8945a_alt_regulators);
135	} else {
136		regulators = act8945a_regulators;
137		num_regulators = ARRAY_SIZE(act8945a_regulators);
138	}
139
140	config.dev = &pdev->dev;
141	config.dev->of_node = pdev->dev.parent->of_node;
142	for (i = 0; i < num_regulators; i++) {
143		rdev = devm_regulator_register(&pdev->dev, &regulators[i], &config);
144		if (IS_ERR(rdev)) {
145			dev_err(&pdev->dev,
146				"failed to register %s regulator\n",
147				regulators[i].name);
148			return PTR_ERR(rdev);
149		}
150	}
151
152	return 0;
153}
154
155static struct platform_driver act8945a_pmic_driver = {
156	.driver = {
157		.name = "act8945a-regulator",
158	},
159	.probe = act8945a_pmic_probe,
160};
161module_platform_driver(act8945a_pmic_driver);
162
163MODULE_DESCRIPTION("Active-semi ACT8945A voltage regulator driver");
164MODULE_AUTHOR("Wenyou Yang <wenyou.yang@atmel.com>");
165MODULE_LICENSE("GPL");