linux/drivers/regulator/max14577-regulator.c
<<
>>
Prefs
   1// SPDX-License-Identifier: GPL-2.0+
   2//
   3// max14577.c - Regulator driver for the Maxim 14577/77836
   4//
   5// Copyright (C) 2013,2014 Samsung Electronics
   6// Krzysztof Kozlowski <krzk@kernel.org>
   7
   8#include <linux/module.h>
   9#include <linux/platform_device.h>
  10#include <linux/regulator/driver.h>
  11#include <linux/mfd/max14577.h>
  12#include <linux/mfd/max14577-private.h>
  13#include <linux/regulator/of_regulator.h>
  14
  15static int max14577_reg_is_enabled(struct regulator_dev *rdev)
  16{
  17        int rid = rdev_get_id(rdev);
  18        struct regmap *rmap = rdev->regmap;
  19        u8 reg_data;
  20
  21        switch (rid) {
  22        case MAX14577_CHARGER:
  23                max14577_read_reg(rmap, MAX14577_CHG_REG_CHG_CTRL2, &reg_data);
  24                if ((reg_data & CHGCTRL2_MBCHOSTEN_MASK) == 0)
  25                        return 0;
  26                max14577_read_reg(rmap, MAX14577_CHG_REG_STATUS3, &reg_data);
  27                if ((reg_data & STATUS3_CGMBC_MASK) == 0)
  28                        return 0;
  29                /* MBCHOSTEN and CGMBC are on */
  30                return 1;
  31        default:
  32                return -EINVAL;
  33        }
  34}
  35
  36static int max14577_reg_get_current_limit(struct regulator_dev *rdev)
  37{
  38        u8 reg_data;
  39        struct regmap *rmap = rdev->regmap;
  40        struct max14577 *max14577 = rdev_get_drvdata(rdev);
  41        const struct maxim_charger_current *limits =
  42                &maxim_charger_currents[max14577->dev_type];
  43
  44        if (rdev_get_id(rdev) != MAX14577_CHARGER)
  45                return -EINVAL;
  46
  47        max14577_read_reg(rmap, MAX14577_CHG_REG_CHG_CTRL4, &reg_data);
  48
  49        if ((reg_data & CHGCTRL4_MBCICHWRCL_MASK) == 0)
  50                return limits->min;
  51
  52        reg_data = ((reg_data & CHGCTRL4_MBCICHWRCH_MASK) >>
  53                        CHGCTRL4_MBCICHWRCH_SHIFT);
  54        return limits->high_start + reg_data * limits->high_step;
  55}
  56
  57static int max14577_reg_set_current_limit(struct regulator_dev *rdev,
  58                int min_uA, int max_uA)
  59{
  60        u8 reg_data;
  61        int ret;
  62        struct max14577 *max14577 = rdev_get_drvdata(rdev);
  63        const struct maxim_charger_current *limits =
  64                &maxim_charger_currents[max14577->dev_type];
  65
  66        if (rdev_get_id(rdev) != MAX14577_CHARGER)
  67                return -EINVAL;
  68
  69        ret = maxim_charger_calc_reg_current(limits, min_uA, max_uA, &reg_data);
  70        if (ret)
  71                return ret;
  72
  73        return max14577_update_reg(rdev->regmap, MAX14577_CHG_REG_CHG_CTRL4,
  74                        CHGCTRL4_MBCICHWRCL_MASK | CHGCTRL4_MBCICHWRCH_MASK,
  75                        reg_data);
  76}
  77
  78static const struct regulator_ops max14577_safeout_ops = {
  79        .is_enabled             = regulator_is_enabled_regmap,
  80        .enable                 = regulator_enable_regmap,
  81        .disable                = regulator_disable_regmap,
  82        .list_voltage           = regulator_list_voltage_linear,
  83};
  84
  85static const struct regulator_ops max14577_charger_ops = {
  86        .is_enabled             = max14577_reg_is_enabled,
  87        .enable                 = regulator_enable_regmap,
  88        .disable                = regulator_disable_regmap,
  89        .get_current_limit      = max14577_reg_get_current_limit,
  90        .set_current_limit      = max14577_reg_set_current_limit,
  91};
  92
  93#define MAX14577_SAFEOUT_REG    { \
  94        .name           = "SAFEOUT", \
  95        .of_match       = of_match_ptr("SAFEOUT"), \
  96        .regulators_node = of_match_ptr("regulators"), \
  97        .id             = MAX14577_SAFEOUT, \
  98        .ops            = &max14577_safeout_ops, \
  99        .type           = REGULATOR_VOLTAGE, \
 100        .owner          = THIS_MODULE, \
 101        .n_voltages     = 1, \
 102        .min_uV         = MAX14577_REGULATOR_SAFEOUT_VOLTAGE, \
 103        .enable_reg     = MAX14577_REG_CONTROL2, \
 104        .enable_mask    = CTRL2_SFOUTORD_MASK, \
 105}
 106#define MAX14577_CHARGER_REG    { \
 107        .name           = "CHARGER", \
 108        .of_match       = of_match_ptr("CHARGER"), \
 109        .regulators_node = of_match_ptr("regulators"), \
 110        .id             = MAX14577_CHARGER, \
 111        .ops            = &max14577_charger_ops, \
 112        .type           = REGULATOR_CURRENT, \
 113        .owner          = THIS_MODULE, \
 114        .enable_reg     = MAX14577_CHG_REG_CHG_CTRL2, \
 115        .enable_mask    = CHGCTRL2_MBCHOSTEN_MASK, \
 116}
 117
 118static const struct regulator_desc max14577_supported_regulators[] = {
 119        [MAX14577_SAFEOUT] = MAX14577_SAFEOUT_REG,
 120        [MAX14577_CHARGER] = MAX14577_CHARGER_REG,
 121};
 122
 123static const struct regulator_ops max77836_ldo_ops = {
 124        .is_enabled             = regulator_is_enabled_regmap,
 125        .enable                 = regulator_enable_regmap,
 126        .disable                = regulator_disable_regmap,
 127        .list_voltage           = regulator_list_voltage_linear,
 128        .map_voltage            = regulator_map_voltage_linear,
 129        .get_voltage_sel        = regulator_get_voltage_sel_regmap,
 130        .set_voltage_sel        = regulator_set_voltage_sel_regmap,
 131        /* TODO: add .set_suspend_mode */
 132};
 133
 134#define MAX77836_LDO_REG(num)   { \
 135        .name           = "LDO" # num, \
 136        .of_match       = of_match_ptr("LDO" # num), \
 137        .regulators_node = of_match_ptr("regulators"), \
 138        .id             = MAX77836_LDO ## num, \
 139        .ops            = &max77836_ldo_ops, \
 140        .type           = REGULATOR_VOLTAGE, \
 141        .owner          = THIS_MODULE, \
 142        .n_voltages     = MAX77836_REGULATOR_LDO_VOLTAGE_STEPS_NUM, \
 143        .min_uV         = MAX77836_REGULATOR_LDO_VOLTAGE_MIN, \
 144        .uV_step        = MAX77836_REGULATOR_LDO_VOLTAGE_STEP, \
 145        .enable_reg     = MAX77836_LDO_REG_CNFG1_LDO ## num, \
 146        .enable_mask    = MAX77836_CNFG1_LDO_PWRMD_MASK, \
 147        .vsel_reg       = MAX77836_LDO_REG_CNFG1_LDO ## num, \
 148        .vsel_mask      = MAX77836_CNFG1_LDO_TV_MASK, \
 149}
 150
 151static const struct regulator_desc max77836_supported_regulators[] = {
 152        [MAX14577_SAFEOUT] = MAX14577_SAFEOUT_REG,
 153        [MAX14577_CHARGER] = MAX14577_CHARGER_REG,
 154        [MAX77836_LDO1] = MAX77836_LDO_REG(1),
 155        [MAX77836_LDO2] = MAX77836_LDO_REG(2),
 156};
 157
 158/**
 159 * Registers for regulators of max77836 use different I2C slave addresses so
 160 * different regmaps must be used for them.
 161 *
 162 * Returns proper regmap for accessing regulator passed by id.
 163 */
 164static struct regmap *max14577_get_regmap(struct max14577 *max14577,
 165                int reg_id)
 166{
 167        switch (max14577->dev_type) {
 168        case MAXIM_DEVICE_TYPE_MAX77836:
 169                switch (reg_id) {
 170                case MAX77836_SAFEOUT ... MAX77836_CHARGER:
 171                        return max14577->regmap;
 172                default:
 173                        /* MAX77836_LDO1 ... MAX77836_LDO2 */
 174                        return max14577->regmap_pmic;
 175                }
 176
 177        case MAXIM_DEVICE_TYPE_MAX14577:
 178        default:
 179                return max14577->regmap;
 180        }
 181}
 182
 183static int max14577_regulator_probe(struct platform_device *pdev)
 184{
 185        struct max14577 *max14577 = dev_get_drvdata(pdev->dev.parent);
 186        struct max14577_platform_data *pdata = dev_get_platdata(max14577->dev);
 187        int i, ret = 0;
 188        struct regulator_config config = {};
 189        const struct regulator_desc *supported_regulators;
 190        unsigned int supported_regulators_size;
 191        enum maxim_device_type dev_type = max14577->dev_type;
 192
 193        switch (dev_type) {
 194        case MAXIM_DEVICE_TYPE_MAX77836:
 195                supported_regulators = max77836_supported_regulators;
 196                supported_regulators_size = ARRAY_SIZE(max77836_supported_regulators);
 197                break;
 198        case MAXIM_DEVICE_TYPE_MAX14577:
 199        default:
 200                supported_regulators = max14577_supported_regulators;
 201                supported_regulators_size = ARRAY_SIZE(max14577_supported_regulators);
 202        }
 203
 204        config.dev = max14577->dev;
 205        config.driver_data = max14577;
 206
 207        for (i = 0; i < supported_regulators_size; i++) {
 208                struct regulator_dev *regulator;
 209                /*
 210                 * Index of supported_regulators[] is also the id and must
 211                 * match index of pdata->regulators[].
 212                 */
 213                if (pdata && pdata->regulators) {
 214                        config.init_data = pdata->regulators[i].initdata;
 215                        config.of_node = pdata->regulators[i].of_node;
 216                }
 217                config.regmap = max14577_get_regmap(max14577,
 218                                supported_regulators[i].id);
 219
 220                regulator = devm_regulator_register(&pdev->dev,
 221                                &supported_regulators[i], &config);
 222                if (IS_ERR(regulator)) {
 223                        ret = PTR_ERR(regulator);
 224                        dev_err(&pdev->dev,
 225                                        "Regulator init failed for %d/%s with error: %d\n",
 226                                        i, supported_regulators[i].name, ret);
 227                        return ret;
 228                }
 229        }
 230
 231        return ret;
 232}
 233
 234static const struct platform_device_id max14577_regulator_id[] = {
 235        { "max14577-regulator", MAXIM_DEVICE_TYPE_MAX14577, },
 236        { "max77836-regulator", MAXIM_DEVICE_TYPE_MAX77836, },
 237        { }
 238};
 239MODULE_DEVICE_TABLE(platform, max14577_regulator_id);
 240
 241static struct platform_driver max14577_regulator_driver = {
 242        .driver = {
 243                   .name = "max14577-regulator",
 244                   },
 245        .probe          = max14577_regulator_probe,
 246        .id_table       = max14577_regulator_id,
 247};
 248
 249static int __init max14577_regulator_init(void)
 250{
 251        BUILD_BUG_ON(ARRAY_SIZE(max14577_supported_regulators) != MAX14577_REGULATOR_NUM);
 252        BUILD_BUG_ON(ARRAY_SIZE(max77836_supported_regulators) != MAX77836_REGULATOR_NUM);
 253
 254        BUILD_BUG_ON(MAX77836_REGULATOR_LDO_VOLTAGE_MIN +
 255                        (MAX77836_REGULATOR_LDO_VOLTAGE_STEP *
 256                          (MAX77836_REGULATOR_LDO_VOLTAGE_STEPS_NUM - 1)) !=
 257                        MAX77836_REGULATOR_LDO_VOLTAGE_MAX);
 258
 259        return platform_driver_register(&max14577_regulator_driver);
 260}
 261subsys_initcall(max14577_regulator_init);
 262
 263static void __exit max14577_regulator_exit(void)
 264{
 265        platform_driver_unregister(&max14577_regulator_driver);
 266}
 267module_exit(max14577_regulator_exit);
 268
 269MODULE_AUTHOR("Krzysztof Kozlowski <krzk@kernel.org>");
 270MODULE_DESCRIPTION("Maxim 14577/77836 regulator driver");
 271MODULE_LICENSE("GPL");
 272