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_is_enabled(struct regulator_dev *rdev)
  37 {
  38         struct regmap *regmap = rdev->regmap;
  39         int ret;
  40         unsigned int reg;
  41
  42         ret = regmap_read(regmap, rdev->desc->enable_reg, &reg);
  43         if (ret) {
  44                 dev_err(&rdev->dev, "Fialed to read charger register\n");
  45                 return ret;
  46         }
  47
  48         return (reg & rdev->desc->enable_mask) == rdev->desc->enable_mask;
  49 }
  50
  51 static int max77843_reg_get_current_limit(struct regulator_dev *rdev)
  52 {
  53         struct regmap *regmap = rdev->regmap;
  54         unsigned int chg_min_uA = rdev->constraints->min_uA;
  55         unsigned int chg_max_uA = rdev->constraints->max_uA;
  56         unsigned int val;
  57         int ret;
  58         unsigned int reg, sel;
  59
  60         ret = regmap_read(regmap, MAX77843_CHG_REG_CHG_CNFG_02, &reg);
  61         if (ret) {
  62                 dev_err(&rdev->dev, "Failed to read charger register\n");
  63                 return ret;
  64         }
  65
  66         sel = reg & MAX77843_CHG_FAST_CHG_CURRENT_MASK;
  67
  68         if (sel < 0x03)
  69                 sel = 0;
  70         else
  71                 sel -= 2;
  72
  73         val = chg_min_uA + MAX77843_CHG_FAST_CHG_CURRENT_STEP * sel;
  74         if (val > chg_max_uA)
  75                 return -EINVAL;
  76
  77         return val;
  78 }
  79
  80 static int max77843_reg_set_current_limit(struct regulator_dev *rdev,
  81                 int min_uA, int max_uA)
  82 {
  83         struct regmap *regmap = rdev->regmap;
  84         unsigned int chg_min_uA = rdev->constraints->min_uA;
  85         int sel = 0;
  86
  87         while (chg_min_uA + MAX77843_CHG_FAST_CHG_CURRENT_STEP * sel < min_uA)
  88                 sel++;
  89
  90         if (chg_min_uA + MAX77843_CHG_FAST_CHG_CURRENT_STEP * sel > max_uA)
  91                 return -EINVAL;
  92
  93         sel += 2;
  94
  95         return regmap_write(regmap, MAX77843_CHG_REG_CHG_CNFG_02, sel);
  96 }
  97
  98 static struct regulator_ops max77843_charger_ops = {
  99         .is_enabled             = max77843_reg_is_enabled,
 100         .enable                 = regulator_enable_regmap,
 101         .disable                = regulator_disable_regmap,
 102         .get_current_limit      = max77843_reg_get_current_limit,
 103         .set_current_limit      = max77843_reg_set_current_limit,
 104 };
 105
 106 static struct regulator_ops max77843_regulator_ops = {
 107         .is_enabled             = regulator_is_enabled_regmap,
 108         .enable                 = regulator_enable_regmap,
 109         .disable                = regulator_disable_regmap,
 110         .list_voltage           = regulator_list_voltage_table,
 111         .get_voltage_sel        = regulator_get_voltage_sel_regmap,
 112         .set_voltage_sel        = regulator_set_voltage_sel_regmap,
 113 };
 114
 115 #define MAX77843_SAFEOUT(num)   { \
 116         .name           = "SAFEOUT" # num, \
 117         .id             = MAX77843_SAFEOUT ## num, \
 118         .ops            = &max77843_regulator_ops, \
 119         .of_match       = of_match_ptr("SAFEOUT" # num), \
 120         .regulators_node = of_match_ptr("regulators"), \
 121         .type           = REGULATOR_VOLTAGE, \
 122         .owner          = THIS_MODULE, \
 123         .n_voltages     = ARRAY_SIZE(max77843_safeout_voltage_table), \
 124         .volt_table     = max77843_safeout_voltage_table, \
 125         .enable_reg     = MAX77843_SYS_REG_SAFEOUTCTRL, \
 126         .enable_mask    = MAX77843_REG_SAFEOUTCTRL_ENSAFEOUT ## num, \
 127         .vsel_reg       = MAX77843_SYS_REG_SAFEOUTCTRL, \
 128         .vsel_mask      = MAX77843_REG_SAFEOUTCTRL_SAFEOUT ## num ## _MASK, \
 129 }
 130
 131 static const struct regulator_desc max77843_supported_regulators[] = {
 132         [MAX77843_SAFEOUT1] = MAX77843_SAFEOUT(1),
 133         [MAX77843_SAFEOUT2] = MAX77843_SAFEOUT(2),
 134         [MAX77843_CHARGER] = {
 135                 .name           = "CHARGER",
 136                 .id             = MAX77843_CHARGER,
 137                 .ops            = &max77843_charger_ops,
 138                 .of_match       = of_match_ptr("CHARGER"),
 139                 .regulators_node = of_match_ptr("regulators"),
 140                 .type           = REGULATOR_CURRENT,
 141                 .owner          = THIS_MODULE,
 142                 .enable_reg     = MAX77843_CHG_REG_CHG_CNFG_00,
 143                 .enable_mask    = MAX77843_CHG_MASK | MAX77843_CHG_BUCK_MASK,
 144         },
 145 };
 146
 147 static struct regmap *max77843_get_regmap(struct max77843 *max77843, int reg_id)
 148 {
 149         switch (reg_id) {
 150         case MAX77843_SAFEOUT1:
 151         case MAX77843_SAFEOUT2:
 152                 return max77843->regmap;
 153         case MAX77843_CHARGER:
 154                 return max77843->regmap_chg;
 155         default:
 156                 return max77843->regmap;
 157         }
 158 }
 159
 160 static int max77843_regulator_probe(struct platform_device *pdev)
 161 {
 162         struct max77843 *max77843 = dev_get_drvdata(pdev->dev.parent);
 163         struct regulator_config config = {};
 164         int i;
 165
 166         config.dev = max77843->dev;
 167         config.driver_data = max77843;
 168
 169         for (i = 0; i < ARRAY_SIZE(max77843_supported_regulators); i++) {
 170                 struct regulator_dev *regulator;
 171
 172                 config.regmap = max77843_get_regmap(max77843,
 173                                 max77843_supported_regulators[i].id);
 174
 175                 regulator = devm_regulator_register(&pdev->dev,
 176                                 &max77843_supported_regulators[i], &config);
 177                 if (IS_ERR(regulator)) {
 178                         dev_err(&pdev->dev,
 179                                         "Failed to regiser regulator-%d\n", i);
 180                         return PTR_ERR(regulator);
 181                 }
 182         }
 183
 184         return 0;
 185 }
 186
 187 static const struct platform_device_id max77843_regulator_id[] = {
 188         { "max77843-regulator", },
 189         { /* sentinel */ },
 190 };
 191
 192 static struct platform_driver max77843_regulator_driver = {
 193         .driver = {
 194                 .name = "max77843-regulator",
 195         },
 196         .probe          = max77843_regulator_probe,
 197         .id_table       = max77843_regulator_id,
 198 };
 199
 200 static int __init max77843_regulator_init(void)
 201 {
 202         return platform_driver_register(&max77843_regulator_driver);
 203 }
 204 subsys_initcall(max77843_regulator_init);
 205
 206 static void __exit max77843_regulator_exit(void)
 207 {
 208         platform_driver_unregister(&max77843_regulator_driver);
 209 }
 210 module_exit(max77843_regulator_exit);
 211
 212 MODULE_AUTHOR("Jaewon Kim <jaewon02.kim@samsung.com>");
 213 MODULE_AUTHOR("Beomho Seo <beomho.seo@samsung.com>");
 214 MODULE_DESCRIPTION("Maxim MAX77843 regulator driver");
 215 MODULE_LICENSE("GPL");