drivers/regulator/act8945a-regulator.c

   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
  55 enum {
  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
  66 static 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
  72 static 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
 101 static 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
 111 static 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
 121 static 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
 155 static struct platform_driver act8945a_pmic_driver = {
 156         .driver = {
 157                 .name = "act8945a-regulator",
 158         },
 159         .probe = act8945a_pmic_probe,
 160 };
 161 module_platform_driver(act8945a_pmic_driver);
 162
 163 MODULE_DESCRIPTION("Active-semi ACT8945A voltage regulator driver");
 164 MODULE_AUTHOR("Wenyou Yang <wenyou.yang@atmel.com>");
 165 MODULE_LICENSE("GPL");