drivers/regulator/max77843.c

   1 /*
   2  * max77843.c - Regulator driver for the Maxim MAX77843
   3  *
   4  * Copyright (C) 2015 Samsung Electronics
   5  * Author: Jaewon Kim <jaewon02.kim@samsung.com>
   6  * Author: Beomho Seo <beomho.seo@samsung.com>
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  */
  13
  14 #include <linux/module.h>
  15 #include <linux/platform_device.h>
  16 #include <linux/regulator/driver.h>
  17 #include <linux/regulator/machine.h>
  18 #include <linux/mfd/max77843-private.h>
  19 #include <linux/regulator/of_regulator.h>
  20
  21 enum max77843_regulator_type {
  22         MAX77843_SAFEOUT1 = 0,
  23         MAX77843_SAFEOUT2,
  24         MAX77843_CHARGER,
  25
  26         MAX77843_NUM,
  27 };
  28
  29 static const unsigned int max77843_safeout_voltage_table[] = {
  30         4850000,
  31         4900000,
  32         4950000,
  33         3300000,
  34 };
  35
  36 static int max77843_reg_get_current_limit(struct regulator_dev *rdev)
  37 {
  38         struct regmap *regmap = rdev->regmap;
  39         unsigned int chg_min_uA = rdev->constraints->min_uA;
  40         unsigned int chg_max_uA = rdev->constraints->max_uA;
  41         unsigned int val;
  42         int ret;
  43         unsigned int reg, sel;
  44
  45         ret = regmap_read(regmap, MAX77843_CHG_REG_CHG_CNFG_02, &reg);
  46         if (ret) {
  47                 dev_err(&rdev->dev, "Failed to read charger register\n");
  48                 return ret;
  49         }
  50
  51         sel = reg & MAX77843_CHG_FAST_CHG_CURRENT_MASK;
  52
  53         if (sel < 0x03)
  54                 sel = 0;
  55         else
  56                 sel -= 2;
  57
  58         val = chg_min_uA + MAX77843_CHG_FAST_CHG_CURRENT_STEP * sel;
  59         if (val > chg_max_uA)
  60                 return -EINVAL;
  61
  62         return val;
  63 }
  64
  65 static int max77843_reg_set_current_limit(struct regulator_dev *rdev,
  66                 int min_uA, int max_uA)
  67 {
  68         struct regmap *regmap = rdev->regmap;
  69         unsigned int chg_min_uA = rdev->constraints->min_uA;
  70         int sel = 0;
  71
  72         while (chg_min_uA + MAX77843_CHG_FAST_CHG_CURRENT_STEP * sel < min_uA)
  73                 sel++;
  74
  75         if (chg_min_uA + MAX77843_CHG_FAST_CHG_CURRENT_STEP * sel > max_uA)
  76                 return -EINVAL;
  77
  78         sel += 2;
  79
  80         return regmap_write(regmap, MAX77843_CHG_REG_CHG_CNFG_02, sel);
  81 }
  82
  83 static struct regulator_ops max77843_charger_ops = {
  84         .is_enabled             = regulator_is_enabled_regmap,
  85         .enable                 = regulator_enable_regmap,
  86         .disable                = regulator_disable_regmap,
  87         .get_current_limit      = max77843_reg_get_current_limit,
  88         .set_current_limit      = max77843_reg_set_current_limit,
  89 };
  90
  91 static struct regulator_ops max77843_regulator_ops = {
  92         .is_enabled             = regulator_is_enabled_regmap,
  93         .enable                 = regulator_enable_regmap,
  94         .disable                = regulator_disable_regmap,
  95         .list_voltage           = regulator_list_voltage_table,
  96         .get_voltage_sel        = regulator_get_voltage_sel_regmap,
  97         .set_voltage_sel        = regulator_set_voltage_sel_regmap,
  98 };
  99
 100 #define MAX77843_SAFEOUT(num)   { \
 101         .name           = "SAFEOUT" # num, \
 102         .id             = MAX77843_SAFEOUT ## num, \
 103         .ops            = &max77843_regulator_ops, \
 104         .of_match       = of_match_ptr("SAFEOUT" # num), \
 105         .regulators_node = of_match_ptr("regulators"), \
 106         .type           = REGULATOR_VOLTAGE, \
 107         .owner          = THIS_MODULE, \
 108         .n_voltages     = ARRAY_SIZE(max77843_safeout_voltage_table), \
 109         .volt_table     = max77843_safeout_voltage_table, \
 110         .enable_reg     = MAX77843_SYS_REG_SAFEOUTCTRL, \
 111         .enable_mask    = MAX77843_REG_SAFEOUTCTRL_ENSAFEOUT ## num, \
 112         .vsel_reg       = MAX77843_SYS_REG_SAFEOUTCTRL, \
 113         .vsel_mask      = MAX77843_REG_SAFEOUTCTRL_SAFEOUT ## num ## _MASK, \
 114 }
 115
 116 static const struct regulator_desc max77843_supported_regulators[] = {
 117         [MAX77843_SAFEOUT1] = MAX77843_SAFEOUT(1),
 118         [MAX77843_SAFEOUT2] = MAX77843_SAFEOUT(2),
 119         [MAX77843_CHARGER] = {
 120                 .name           = "CHARGER",
 121                 .id             = MAX77843_CHARGER,
 122                 .ops            = &max77843_charger_ops,
 123                 .of_match       = of_match_ptr("CHARGER"),
 124                 .regulators_node = of_match_ptr("regulators"),
 125                 .type           = REGULATOR_CURRENT,
 126                 .owner          = THIS_MODULE,
 127                 .enable_reg     = MAX77843_CHG_REG_CHG_CNFG_00,
 128                 .enable_mask    = MAX77843_CHG_MASK | MAX77843_CHG_BUCK_MASK,
 129                 .enable_val     = MAX77843_CHG_MASK | MAX77843_CHG_BUCK_MASK,
 130         },
 131 };
 132
 133 static struct regmap *max77843_get_regmap(struct max77843 *max77843, int reg_id)
 134 {
 135         switch (reg_id) {
 136         case MAX77843_SAFEOUT1:
 137         case MAX77843_SAFEOUT2:
 138                 return max77843->regmap;
 139         case MAX77843_CHARGER:
 140                 return max77843->regmap_chg;
 141         default:
 142                 return max77843->regmap;
 143         }
 144 }
 145
 146 static int max77843_regulator_probe(struct platform_device *pdev)
 147 {
 148         struct max77843 *max77843 = dev_get_drvdata(pdev->dev.parent);
 149         struct regulator_config config = {};
 150         int i;
 151
 152         config.dev = max77843->dev;
 153         config.driver_data = max77843;
 154
 155         for (i = 0; i < ARRAY_SIZE(max77843_supported_regulators); i++) {
 156                 struct regulator_dev *regulator;
 157
 158                 config.regmap = max77843_get_regmap(max77843,
 159                                 max77843_supported_regulators[i].id);
 160
 161                 regulator = devm_regulator_register(&pdev->dev,
 162                                 &max77843_supported_regulators[i], &config);
 163                 if (IS_ERR(regulator)) {
 164                         dev_err(&pdev->dev,
 165                                         "Failed to regiser regulator-%d\n", i);
 166                         return PTR_ERR(regulator);
 167                 }
 168         }
 169
 170         return 0;
 171 }
 172
 173 static const struct platform_device_id max77843_regulator_id[] = {
 174         { "max77843-regulator", },
 175         { /* sentinel */ },
 176 };
 177
 178 static struct platform_driver max77843_regulator_driver = {
 179         .driver = {
 180                 .name = "max77843-regulator",
 181         },
 182         .probe          = max77843_regulator_probe,
 183         .id_table       = max77843_regulator_id,
 184 };
 185
 186 static int __init max77843_regulator_init(void)
 187 {
 188         return platform_driver_register(&max77843_regulator_driver);
 189 }
 190 subsys_initcall(max77843_regulator_init);
 191
 192 static void __exit max77843_regulator_exit(void)
 193 {
 194         platform_driver_unregister(&max77843_regulator_driver);
 195 }
 196 module_exit(max77843_regulator_exit);
 197
 198 MODULE_AUTHOR("Jaewon Kim <jaewon02.kim@samsung.com>");
 199 MODULE_AUTHOR("Beomho Seo <beomho.seo@samsung.com>");
 200 MODULE_DESCRIPTION("Maxim MAX77843 regulator driver");
 201 MODULE_LICENSE("GPL");