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 static const struct regulator_desc max77843_supported_regulators[] = {
 116         [MAX77843_SAFEOUT1] = {
 117                 .name           = "SAFEOUT1",
 118                 .id             = MAX77843_SAFEOUT1,
 119                 .ops            = &max77843_regulator_ops,
 120                 .of_match       = of_match_ptr("SAFEOUT1"),
 121                 .regulators_node = of_match_ptr("regulators"),
 122                 .type           = REGULATOR_VOLTAGE,
 123                 .owner          = THIS_MODULE,
 124                 .n_voltages     = ARRAY_SIZE(max77843_safeout_voltage_table),
 125                 .volt_table     = max77843_safeout_voltage_table,
 126                 .enable_reg     = MAX77843_SYS_REG_SAFEOUTCTRL,
 127                 .enable_mask    = MAX77843_REG_SAFEOUTCTRL_ENSAFEOUT1,
 128                 .vsel_reg       = MAX77843_SYS_REG_SAFEOUTCTRL,
 129                 .vsel_mask      = MAX77843_REG_SAFEOUTCTRL_SAFEOUT1_MASK,
 130         },
 131         [MAX77843_SAFEOUT2] = {
 132                 .name           = "SAFEOUT2",
 133                 .id             = MAX77843_SAFEOUT2,
 134                 .ops            = &max77843_regulator_ops,
 135                 .of_match       = of_match_ptr("SAFEOUT2"),
 136                 .regulators_node = of_match_ptr("regulators"),
 137                 .type           = REGULATOR_VOLTAGE,
 138                 .owner          = THIS_MODULE,
 139                 .n_voltages     = ARRAY_SIZE(max77843_safeout_voltage_table),
 140                 .volt_table     = max77843_safeout_voltage_table,
 141                 .enable_reg     = MAX77843_SYS_REG_SAFEOUTCTRL,
 142                 .enable_mask    = MAX77843_REG_SAFEOUTCTRL_ENSAFEOUT2,
 143                 .vsel_reg       = MAX77843_SYS_REG_SAFEOUTCTRL,
 144                 .vsel_mask      = MAX77843_REG_SAFEOUTCTRL_SAFEOUT2_MASK,
 145         },
 146         [MAX77843_CHARGER] = {
 147                 .name           = "CHARGER",
 148                 .id             = MAX77843_CHARGER,
 149                 .ops            = &max77843_charger_ops,
 150                 .of_match       = of_match_ptr("CHARGER"),
 151                 .regulators_node = of_match_ptr("regulators"),
 152                 .type           = REGULATOR_CURRENT,
 153                 .owner          = THIS_MODULE,
 154                 .enable_reg     = MAX77843_CHG_REG_CHG_CNFG_00,
 155                 .enable_mask    = MAX77843_CHG_MASK,
 156         },
 157 };
 158
 159 static struct regmap *max77843_get_regmap(struct max77843 *max77843, int reg_id)
 160 {
 161         switch (reg_id) {
 162         case MAX77843_SAFEOUT1:
 163         case MAX77843_SAFEOUT2:
 164                 return max77843->regmap;
 165         case MAX77843_CHARGER:
 166                 return max77843->regmap_chg;
 167         default:
 168                 return max77843->regmap;
 169         }
 170 }
 171
 172 static int max77843_regulator_probe(struct platform_device *pdev)
 173 {
 174         struct max77843 *max77843 = dev_get_drvdata(pdev->dev.parent);
 175         struct regulator_config config = {};
 176         int i;
 177
 178         config.dev = max77843->dev;
 179         config.driver_data = max77843;
 180
 181         for (i = 0; i < ARRAY_SIZE(max77843_supported_regulators); i++) {
 182                 struct regulator_dev *regulator;
 183
 184                 config.regmap = max77843_get_regmap(max77843,
 185                                 max77843_supported_regulators[i].id);
 186
 187                 regulator = devm_regulator_register(&pdev->dev,
 188                                 &max77843_supported_regulators[i], &config);
 189                 if (IS_ERR(regulator)) {
 190                         dev_err(&pdev->dev,
 191                                         "Failed to regiser regulator-%d\n", i);
 192                         return PTR_ERR(regulator);
 193                 }
 194         }
 195
 196         return 0;
 197 }
 198
 199 static const struct platform_device_id max77843_regulator_id[] = {
 200         { "max77843-regulator", },
 201         { /* sentinel */ },
 202 };
 203
 204 static struct platform_driver max77843_regulator_driver = {
 205         .driver = {
 206                 .name = "max77843-regulator",
 207         },
 208         .probe          = max77843_regulator_probe,
 209         .id_table       = max77843_regulator_id,
 210 };
 211
 212 static int __init max77843_regulator_init(void)
 213 {
 214         return platform_driver_register(&max77843_regulator_driver);
 215 }
 216 subsys_initcall(max77843_regulator_init);
 217
 218 static void __exit max77843_regulator_exit(void)
 219 {
 220         platform_driver_unregister(&max77843_regulator_driver);
 221 }
 222 module_exit(max77843_regulator_exit);
 223
 224 MODULE_AUTHOR("Jaewon Kim <jaewon02.kim@samsung.com>");
 225 MODULE_AUTHOR("Beomho Seo <beomho.seo@samsung.com>");
 226 MODULE_DESCRIPTION("Maxim MAX77843 regulator driver");
 227 MODULE_LICENSE("GPL");