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_RBTREE, 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", 0}, 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"); 165