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