drivers/regulator/mt6311-regulator.c

   1 /*
   2  * Copyright (c) 2015 MediaTek Inc.
   3  * Author: Henry Chen <henryc.chen@mediatek.com>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License version 2 as
   7  * published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  */
  14
  15 #include <linux/err.h>
  16 #include <linux/gpio.h>
  17 #include <linux/i2c.h>
  18 #include <linux/init.h>
  19 #include <linux/interrupt.h>
  20 #include <linux/module.h>
  21 #include <linux/regmap.h>
  22 #include <linux/regulator/driver.h>
  23 #include <linux/regulator/machine.h>
  24 #include <linux/regulator/of_regulator.h>
  25 #include <linux/regulator/mt6311.h>
  26 #include <linux/slab.h>
  27 #include "mt6311-regulator.h"
  28
  29 static const struct regmap_config mt6311_regmap_config = {
  30         .reg_bits = 8,
  31         .val_bits = 8,
  32         .max_register = MT6311_FQMTR_CON4,
  33         .cache_type = REGCACHE_RBTREE,
  34 };
  35
  36 /* Default limits measured in millivolts and milliamps */
  37 #define MT6311_MIN_UV           600000
  38 #define MT6311_MAX_UV           1393750
  39 #define MT6311_STEP_UV          6250
  40
  41 static const struct regulator_ops mt6311_buck_ops = {
  42         .list_voltage = regulator_list_voltage_linear,
  43         .map_voltage = regulator_map_voltage_linear,
  44         .set_voltage_sel = regulator_set_voltage_sel_regmap,
  45         .get_voltage_sel = regulator_get_voltage_sel_regmap,
  46         .set_voltage_time_sel = regulator_set_voltage_time_sel,
  47         .enable = regulator_enable_regmap,
  48         .disable = regulator_disable_regmap,
  49         .is_enabled = regulator_is_enabled_regmap,
  50 };
  51
  52 static const struct regulator_ops mt6311_ldo_ops = {
  53         .enable = regulator_enable_regmap,
  54         .disable = regulator_disable_regmap,
  55         .is_enabled = regulator_is_enabled_regmap,
  56 };
  57
  58 #define MT6311_BUCK(_id) \
  59 {\
  60         .name = #_id,\
  61         .ops = &mt6311_buck_ops,\
  62         .of_match = of_match_ptr(#_id),\
  63         .regulators_node = of_match_ptr("regulators"),\
  64         .type = REGULATOR_VOLTAGE,\
  65         .id = MT6311_ID_##_id,\
  66         .n_voltages = (MT6311_MAX_UV - MT6311_MIN_UV) / MT6311_STEP_UV + 1,\
  67         .min_uV = MT6311_MIN_UV,\
  68         .uV_step = MT6311_STEP_UV,\
  69         .owner = THIS_MODULE,\
  70         .enable_reg = MT6311_VDVFS11_CON9,\
  71         .enable_mask = MT6311_PMIC_VDVFS11_EN_MASK,\
  72         .vsel_reg = MT6311_VDVFS11_CON12,\
  73         .vsel_mask = MT6311_PMIC_VDVFS11_VOSEL_MASK,\
  74 }
  75
  76 #define MT6311_LDO(_id) \
  77 {\
  78         .name = #_id,\
  79         .ops = &mt6311_ldo_ops,\
  80         .of_match = of_match_ptr(#_id),\
  81         .regulators_node = of_match_ptr("regulators"),\
  82         .type = REGULATOR_VOLTAGE,\
  83         .id = MT6311_ID_##_id,\
  84         .owner = THIS_MODULE,\
  85         .enable_reg = MT6311_LDO_CON3,\
  86         .enable_mask = MT6311_PMIC_RG_VBIASN_EN_MASK,\
  87 }
  88
  89 static const struct regulator_desc mt6311_regulators[] = {
  90         MT6311_BUCK(VDVFS),
  91         MT6311_LDO(VBIASN),
  92 };
  93
  94 /*
  95  * I2C driver interface functions
  96  */
  97 static int mt6311_i2c_probe(struct i2c_client *i2c,
  98                 const struct i2c_device_id *id)
  99 {
 100         struct regulator_config config = { };
 101         struct regulator_dev *rdev;
 102         struct regmap *regmap;
 103         int i, ret;
 104         unsigned int data;
 105
 106         regmap = devm_regmap_init_i2c(i2c, &mt6311_regmap_config);
 107         if (IS_ERR(regmap)) {
 108                 ret = PTR_ERR(regmap);
 109                 dev_err(&i2c->dev, "Failed to allocate register map: %d\n",
 110                         ret);
 111                 return ret;
 112         }
 113
 114         ret = regmap_read(regmap, MT6311_SWCID, &data);
 115         if (ret < 0) {
 116                 dev_err(&i2c->dev, "Failed to read DEVICE_ID reg: %d\n", ret);
 117                 return ret;
 118         }
 119
 120         switch (data) {
 121         case MT6311_E1_CID_CODE:
 122         case MT6311_E2_CID_CODE:
 123         case MT6311_E3_CID_CODE:
 124                 break;
 125         default:
 126                 dev_err(&i2c->dev, "Unsupported device id = 0x%x.\n", data);
 127                 return -ENODEV;
 128         }
 129
 130         for (i = 0; i < MT6311_MAX_REGULATORS; i++) {
 131                 config.dev = &i2c->dev;
 132                 config.regmap = regmap;
 133
 134                 rdev = devm_regulator_register(&i2c->dev,
 135                         &mt6311_regulators[i], &config);
 136                 if (IS_ERR(rdev)) {
 137                         dev_err(&i2c->dev,
 138                                 "Failed to register MT6311 regulator\n");
 139                         return PTR_ERR(rdev);
 140                 }
 141         }
 142
 143         return 0;
 144 }
 145
 146 static const struct i2c_device_id mt6311_i2c_id[] = {
 147         {"mt6311", 0},
 148         {},
 149 };
 150 MODULE_DEVICE_TABLE(i2c, mt6311_i2c_id);
 151
 152 #ifdef CONFIG_OF
 153 static const struct of_device_id mt6311_dt_ids[] = {
 154         { .compatible = "mediatek,mt6311-regulator",
 155           .data = &mt6311_i2c_id[0] },
 156         {},
 157 };
 158 MODULE_DEVICE_TABLE(of, mt6311_dt_ids);
 159 #endif
 160
 161 static struct i2c_driver mt6311_regulator_driver = {
 162         .driver = {
 163                 .name = "mt6311",
 164                 .of_match_table = of_match_ptr(mt6311_dt_ids),
 165         },
 166         .probe = mt6311_i2c_probe,
 167         .id_table = mt6311_i2c_id,
 168 };
 169
 170 module_i2c_driver(mt6311_regulator_driver);
 171
 172 MODULE_AUTHOR("Henry Chen <henryc.chen@mediatek.com>");
 173 MODULE_DESCRIPTION("Regulator device driver for Mediatek MT6311");
 174 MODULE_LICENSE("GPL v2");