drivers/regulator/mt6311-regulator.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 //
   3 // Copyright (c) 2015 MediaTek Inc.
   4 // Author: Henry Chen <henryc.chen@mediatek.com>
   5
   6 #include <linux/err.h>
   7 #include <linux/gpio.h>
   8 #include <linux/i2c.h>
   9 #include <linux/init.h>
  10 #include <linux/interrupt.h>
  11 #include <linux/module.h>
  12 #include <linux/regmap.h>
  13 #include <linux/regulator/driver.h>
  14 #include <linux/regulator/machine.h>
  15 #include <linux/regulator/of_regulator.h>
  16 #include <linux/regulator/mt6311.h>
  17 #include <linux/slab.h>
  18 #include "mt6311-regulator.h"
  19
  20 static const struct regmap_config mt6311_regmap_config = {
  21         .reg_bits = 8,
  22         .val_bits = 8,
  23         .max_register = MT6311_FQMTR_CON4,
  24         .cache_type = REGCACHE_RBTREE,
  25 };
  26
  27 /* Default limits measured in millivolts and milliamps */
  28 #define MT6311_MIN_UV           600000
  29 #define MT6311_MAX_UV           1393750
  30 #define MT6311_STEP_UV          6250
  31
  32 static const struct regulator_ops mt6311_buck_ops = {
  33         .list_voltage = regulator_list_voltage_linear,
  34         .map_voltage = regulator_map_voltage_linear,
  35         .set_voltage_sel = regulator_set_voltage_sel_regmap,
  36         .get_voltage_sel = regulator_get_voltage_sel_regmap,
  37         .set_voltage_time_sel = regulator_set_voltage_time_sel,
  38         .enable = regulator_enable_regmap,
  39         .disable = regulator_disable_regmap,
  40         .is_enabled = regulator_is_enabled_regmap,
  41 };
  42
  43 static const struct regulator_ops mt6311_ldo_ops = {
  44         .enable = regulator_enable_regmap,
  45         .disable = regulator_disable_regmap,
  46         .is_enabled = regulator_is_enabled_regmap,
  47 };
  48
  49 #define MT6311_BUCK(_id) \
  50 {\
  51         .name = #_id,\
  52         .ops = &mt6311_buck_ops,\
  53         .of_match = of_match_ptr(#_id),\
  54         .regulators_node = of_match_ptr("regulators"),\
  55         .type = REGULATOR_VOLTAGE,\
  56         .id = MT6311_ID_##_id,\
  57         .n_voltages = (MT6311_MAX_UV - MT6311_MIN_UV) / MT6311_STEP_UV + 1,\
  58         .min_uV = MT6311_MIN_UV,\
  59         .uV_step = MT6311_STEP_UV,\
  60         .owner = THIS_MODULE,\
  61         .enable_reg = MT6311_VDVFS11_CON9,\
  62         .enable_mask = MT6311_PMIC_VDVFS11_EN_MASK,\
  63         .vsel_reg = MT6311_VDVFS11_CON12,\
  64         .vsel_mask = MT6311_PMIC_VDVFS11_VOSEL_MASK,\
  65 }
  66
  67 #define MT6311_LDO(_id) \
  68 {\
  69         .name = #_id,\
  70         .ops = &mt6311_ldo_ops,\
  71         .of_match = of_match_ptr(#_id),\
  72         .regulators_node = of_match_ptr("regulators"),\
  73         .type = REGULATOR_VOLTAGE,\
  74         .id = MT6311_ID_##_id,\
  75         .owner = THIS_MODULE,\
  76         .enable_reg = MT6311_LDO_CON3,\
  77         .enable_mask = MT6311_PMIC_RG_VBIASN_EN_MASK,\
  78 }
  79
  80 static const struct regulator_desc mt6311_regulators[] = {
  81         MT6311_BUCK(VDVFS),
  82         MT6311_LDO(VBIASN),
  83 };
  84
  85 /*
  86  * I2C driver interface functions
  87  */
  88 static int mt6311_i2c_probe(struct i2c_client *i2c)
  89 {
  90         struct regulator_config config = { };
  91         struct regulator_dev *rdev;
  92         struct regmap *regmap;
  93         int i, ret;
  94         unsigned int data;
  95
  96         regmap = devm_regmap_init_i2c(i2c, &mt6311_regmap_config);
  97         if (IS_ERR(regmap)) {
  98                 ret = PTR_ERR(regmap);
  99                 dev_err(&i2c->dev, "Failed to allocate register map: %d\n",
 100                         ret);
 101                 return ret;
 102         }
 103
 104         ret = regmap_read(regmap, MT6311_SWCID, &data);
 105         if (ret < 0) {
 106                 dev_err(&i2c->dev, "Failed to read DEVICE_ID reg: %d\n", ret);
 107                 return ret;
 108         }
 109
 110         switch (data) {
 111         case MT6311_E1_CID_CODE:
 112         case MT6311_E2_CID_CODE:
 113         case MT6311_E3_CID_CODE:
 114                 break;
 115         default:
 116                 dev_err(&i2c->dev, "Unsupported device id = 0x%x.\n", data);
 117                 return -ENODEV;
 118         }
 119
 120         for (i = 0; i < MT6311_MAX_REGULATORS; i++) {
 121                 config.dev = &i2c->dev;
 122                 config.regmap = regmap;
 123
 124                 rdev = devm_regulator_register(&i2c->dev,
 125                         &mt6311_regulators[i], &config);
 126                 if (IS_ERR(rdev)) {
 127                         dev_err(&i2c->dev,
 128                                 "Failed to register MT6311 regulator\n");
 129                         return PTR_ERR(rdev);
 130                 }
 131         }
 132
 133         return 0;
 134 }
 135
 136 static const struct i2c_device_id mt6311_i2c_id[] = {
 137         {"mt6311", 0},
 138         {},
 139 };
 140 MODULE_DEVICE_TABLE(i2c, mt6311_i2c_id);
 141
 142 #ifdef CONFIG_OF
 143 static const struct of_device_id mt6311_dt_ids[] = {
 144         { .compatible = "mediatek,mt6311-regulator",
 145           .data = &mt6311_i2c_id[0] },
 146         {},
 147 };
 148 MODULE_DEVICE_TABLE(of, mt6311_dt_ids);
 149 #endif
 150
 151 static struct i2c_driver mt6311_regulator_driver = {
 152         .driver = {
 153                 .name = "mt6311",
 154                 .of_match_table = of_match_ptr(mt6311_dt_ids),
 155         },
 156         .probe_new = mt6311_i2c_probe,
 157         .id_table = mt6311_i2c_id,
 158 };
 159
 160 module_i2c_driver(mt6311_regulator_driver);
 161
 162 MODULE_AUTHOR("Henry Chen <henryc.chen@mediatek.com>");
 163 MODULE_DESCRIPTION("Regulator device driver for Mediatek MT6311");
 164 MODULE_LICENSE("GPL v2");