kernel/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 };
  34
  35 /* Default limits measured in millivolts and milliamps */
  36 #define MT6311_MIN_UV           600000
  37 #define MT6311_MAX_UV           1393750
  38 #define MT6311_STEP_UV          6250
  39
  40 static const struct regulator_linear_range buck_volt_range[] = {
  41         REGULATOR_LINEAR_RANGE(MT6311_MIN_UV, 0, 0x7f, MT6311_STEP_UV),
  42 };
  43
  44 static const struct regulator_ops mt6311_buck_ops = {
  45         .list_voltage = regulator_list_voltage_linear_range,
  46         .map_voltage = regulator_map_voltage_linear_range,
  47         .set_voltage_sel = regulator_set_voltage_sel_regmap,
  48         .get_voltage_sel = regulator_get_voltage_sel_regmap,
  49         .set_voltage_time_sel = regulator_set_voltage_time_sel,
  50         .enable = regulator_enable_regmap,
  51         .disable = regulator_disable_regmap,
  52         .is_enabled = regulator_is_enabled_regmap,
  53 };
  54
  55 static const struct regulator_ops mt6311_ldo_ops = {
  56         .enable = regulator_enable_regmap,
  57         .disable = regulator_disable_regmap,
  58         .is_enabled = regulator_is_enabled_regmap,
  59 };
  60
  61 #define MT6311_BUCK(_id) \
  62 {\
  63         .name = #_id,\
  64         .ops = &mt6311_buck_ops,\
  65         .of_match = of_match_ptr(#_id),\
  66         .regulators_node = of_match_ptr("regulators"),\
  67         .type = REGULATOR_VOLTAGE,\
  68         .id = MT6311_ID_##_id,\
  69         .n_voltages = (MT6311_MAX_UV - MT6311_MIN_UV) / MT6311_STEP_UV + 1,\
  70         .min_uV = MT6311_MIN_UV,\
  71         .uV_step = MT6311_STEP_UV,\
  72         .owner = THIS_MODULE,\
  73         .linear_ranges = buck_volt_range, \
  74         .n_linear_ranges = ARRAY_SIZE(buck_volt_range), \
  75         .enable_reg = MT6311_VDVFS11_CON9,\
  76         .enable_mask = MT6311_PMIC_VDVFS11_EN_MASK,\
  77         .vsel_reg = MT6311_VDVFS11_CON12,\
  78         .vsel_mask = MT6311_PMIC_VDVFS11_VOSEL_MASK,\
  79 }
  80
  81 #define MT6311_LDO(_id) \
  82 {\
  83         .name = #_id,\
  84         .ops = &mt6311_ldo_ops,\
  85         .of_match = of_match_ptr(#_id),\
  86         .regulators_node = of_match_ptr("regulators"),\
  87         .type = REGULATOR_VOLTAGE,\
  88         .id = MT6311_ID_##_id,\
  89         .owner = THIS_MODULE,\
  90         .enable_reg = MT6311_LDO_CON3,\
  91         .enable_mask = MT6311_PMIC_RG_VBIASN_EN_MASK,\
  92 }
  93
  94 static const struct regulator_desc mt6311_regulators[] = {
  95         MT6311_BUCK(VDVFS),
  96         MT6311_LDO(VBIASN),
  97 };
  98
  99 /*
 100  * I2C driver interface functions
 101  */
 102 static int mt6311_i2c_probe(struct i2c_client *i2c,
 103                 const struct i2c_device_id *id)
 104 {
 105         struct regulator_config config = { };
 106         struct regulator_dev *rdev;
 107         struct regmap *regmap;
 108         int i, ret;
 109         unsigned int data;
 110
 111         regmap = devm_regmap_init_i2c(i2c, &mt6311_regmap_config);
 112         if (IS_ERR(regmap)) {
 113                 ret = PTR_ERR(regmap);
 114                 dev_err(&i2c->dev, "Failed to allocate register map: %d\n",
 115                         ret);
 116                 return ret;
 117         }
 118
 119         ret = regmap_read(regmap, MT6311_SWCID, &data);
 120         if (ret < 0) {
 121                 dev_err(&i2c->dev, "Failed to read DEVICE_ID reg: %d\n", ret);
 122                 return ret;
 123         }
 124
 125         switch (data) {
 126         case MT6311_E1_CID_CODE:
 127         case MT6311_E2_CID_CODE:
 128         case MT6311_E3_CID_CODE:
 129                 break;
 130         default:
 131                 dev_err(&i2c->dev, "Unsupported device id = 0x%x.\n", data);
 132                 return -ENODEV;
 133         }
 134
 135         for (i = 0; i < MT6311_MAX_REGULATORS; i++) {
 136                 config.dev = &i2c->dev;
 137                 config.regmap = regmap;
 138
 139                 rdev = devm_regulator_register(&i2c->dev,
 140                         &mt6311_regulators[i], &config);
 141                 if (IS_ERR(rdev)) {
 142                         dev_err(&i2c->dev,
 143                                 "Failed to register MT6311 regulator\n");
 144                         return PTR_ERR(rdev);
 145                 }
 146         }
 147
 148         return 0;
 149 }
 150
 151 static const struct i2c_device_id mt6311_i2c_id[] = {
 152         {"mt6311", 0},
 153         {},
 154 };
 155 MODULE_DEVICE_TABLE(i2c, mt6311_i2c_id);
 156
 157 #ifdef CONFIG_OF
 158 static const struct of_device_id mt6311_dt_ids[] = {
 159         { .compatible = "mediatek,mt6311-regulator",
 160           .data = &mt6311_i2c_id[0] },
 161         {},
 162 };
 163 MODULE_DEVICE_TABLE(of, mt6311_dt_ids);
 164 #endif
 165
 166 static struct i2c_driver mt6311_regulator_driver = {
 167         .driver = {
 168                 .name = "mt6311",
 169                 .of_match_table = of_match_ptr(mt6311_dt_ids),
 170         },
 171         .probe = mt6311_i2c_probe,
 172         .id_table = mt6311_i2c_id,
 173 };
 174
 175 module_i2c_driver(mt6311_regulator_driver);
 176
 177 MODULE_AUTHOR("Henry Chen <henryc.chen@mediatek.com>");
 178 MODULE_DESCRIPTION("Regulator device driver for Mediatek MT6311");
 179 MODULE_LICENSE("GPL v2");