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"); 181