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