1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * linux/drivers/regulator/aat2870-regulator.c 4 * 5 * Copyright (c) 2011, NVIDIA Corporation. 6 * Author: Jin Park <jinyoungp@nvidia.com> 7 */ 8 9 #include <linux/kernel.h> 10 #include <linux/init.h> 11 #include <linux/err.h> 12 #include <linux/module.h> 13 #include <linux/slab.h> 14 #include <linux/platform_device.h> 15 #include <linux/regulator/driver.h> 16 #include <linux/regulator/machine.h> 17 #include <linux/mfd/aat2870.h> 18 19 struct aat2870_regulator { 20 struct aat2870_data *aat2870; 21 struct regulator_desc desc; 22 23 u8 enable_addr; 24 u8 enable_shift; 25 u8 enable_mask; 26 27 u8 voltage_addr; 28 u8 voltage_shift; 29 u8 voltage_mask; 30 }; 31 32 static int aat2870_ldo_set_voltage_sel(struct regulator_dev *rdev, 33 unsigned selector) 34 { 35 struct aat2870_regulator *ri = rdev_get_drvdata(rdev); 36 struct aat2870_data *aat2870 = ri->aat2870; 37 38 return aat2870->update(aat2870, ri->voltage_addr, ri->voltage_mask, 39 selector << ri->voltage_shift); 40 } 41 42 static int aat2870_ldo_get_voltage_sel(struct regulator_dev *rdev) 43 { 44 struct aat2870_regulator *ri = rdev_get_drvdata(rdev); 45 struct aat2870_data *aat2870 = ri->aat2870; 46 u8 val; 47 int ret; 48 49 ret = aat2870->read(aat2870, ri->voltage_addr, &val); 50 if (ret) 51 return ret; 52 53 return (val & ri->voltage_mask) >> ri->voltage_shift; 54 } 55 56 static int aat2870_ldo_enable(struct regulator_dev *rdev) 57 { 58 struct aat2870_regulator *ri = rdev_get_drvdata(rdev); 59 struct aat2870_data *aat2870 = ri->aat2870; 60 61 return aat2870->update(aat2870, ri->enable_addr, ri->enable_mask, 62 ri->enable_mask); 63 } 64 65 static int aat2870_ldo_disable(struct regulator_dev *rdev) 66 { 67 struct aat2870_regulator *ri = rdev_get_drvdata(rdev); 68 struct aat2870_data *aat2870 = ri->aat2870; 69 70 return aat2870->update(aat2870, ri->enable_addr, ri->enable_mask, 0); 71 } 72 73 static int aat2870_ldo_is_enabled(struct regulator_dev *rdev) 74 { 75 struct aat2870_regulator *ri = rdev_get_drvdata(rdev); 76 struct aat2870_data *aat2870 = ri->aat2870; 77 u8 val; 78 int ret; 79 80 ret = aat2870->read(aat2870, ri->enable_addr, &val); 81 if (ret) 82 return ret; 83 84 return val & ri->enable_mask ? 1 : 0; 85 } 86 87 static const struct regulator_ops aat2870_ldo_ops = { 88 .list_voltage = regulator_list_voltage_table, 89 .map_voltage = regulator_map_voltage_ascend, 90 .set_voltage_sel = aat2870_ldo_set_voltage_sel, 91 .get_voltage_sel = aat2870_ldo_get_voltage_sel, 92 .enable = aat2870_ldo_enable, 93 .disable = aat2870_ldo_disable, 94 .is_enabled = aat2870_ldo_is_enabled, 95 }; 96 97 static const unsigned int aat2870_ldo_voltages[] = { 98 1200000, 1300000, 1500000, 1600000, 99 1800000, 2000000, 2200000, 2500000, 100 2600000, 2700000, 2800000, 2900000, 101 3000000, 3100000, 3200000, 3300000, 102 }; 103 104 #define AAT2870_LDO(ids) \ 105 { \ 106 .desc = { \ 107 .name = #ids, \ 108 .id = AAT2870_ID_##ids, \ 109 .n_voltages = ARRAY_SIZE(aat2870_ldo_voltages), \ 110 .volt_table = aat2870_ldo_voltages, \ 111 .ops = &aat2870_ldo_ops, \ 112 .type = REGULATOR_VOLTAGE, \ 113 .owner = THIS_MODULE, \ 114 }, \ 115 } 116 117 static struct aat2870_regulator aat2870_regulators[] = { 118 AAT2870_LDO(LDOA), 119 AAT2870_LDO(LDOB), 120 AAT2870_LDO(LDOC), 121 AAT2870_LDO(LDOD), 122 }; 123 124 static struct aat2870_regulator *aat2870_get_regulator(int id) 125 { 126 struct aat2870_regulator *ri = NULL; 127 int i; 128 129 for (i = 0; i < ARRAY_SIZE(aat2870_regulators); i++) { 130 ri = &aat2870_regulators[i]; 131 if (ri->desc.id == id) 132 break; 133 } 134 135 if (i == ARRAY_SIZE(aat2870_regulators)) 136 return NULL; 137 138 ri->enable_addr = AAT2870_LDO_EN; 139 ri->enable_shift = id - AAT2870_ID_LDOA; 140 ri->enable_mask = 0x1 << ri->enable_shift; 141 142 ri->voltage_addr = (id - AAT2870_ID_LDOA) / 2 ? 143 AAT2870_LDO_CD : AAT2870_LDO_AB; 144 ri->voltage_shift = (id - AAT2870_ID_LDOA) % 2 ? 0 : 4; 145 ri->voltage_mask = 0xF << ri->voltage_shift; 146 147 return ri; 148 } 149 150 static int aat2870_regulator_probe(struct platform_device *pdev) 151 { 152 struct aat2870_regulator *ri; 153 struct regulator_config config = { }; 154 struct regulator_dev *rdev; 155 156 ri = aat2870_get_regulator(pdev->id); 157 if (!ri) { 158 dev_err(&pdev->dev, "Invalid device ID, %d\n", pdev->id); 159 return -EINVAL; 160 } 161 ri->aat2870 = dev_get_drvdata(pdev->dev.parent); 162 163 config.dev = &pdev->dev; 164 config.driver_data = ri; 165 config.init_data = dev_get_platdata(&pdev->dev); 166 167 rdev = devm_regulator_register(&pdev->dev, &ri->desc, &config); 168 if (IS_ERR(rdev)) { 169 dev_err(&pdev->dev, "Failed to register regulator %s\n", 170 ri->desc.name); 171 return PTR_ERR(rdev); 172 } 173 platform_set_drvdata(pdev, rdev); 174 175 return 0; 176 } 177 178 static struct platform_driver aat2870_regulator_driver = { 179 .driver = { 180 .name = "aat2870-regulator", 181 .probe_type = PROBE_PREFER_ASYNCHRONOUS, 182 }, 183 .probe = aat2870_regulator_probe, 184 }; 185 186 static int __init aat2870_regulator_init(void) 187 { 188 return platform_driver_register(&aat2870_regulator_driver); 189 } 190 subsys_initcall(aat2870_regulator_init); 191 192 static void __exit aat2870_regulator_exit(void) 193 { 194 platform_driver_unregister(&aat2870_regulator_driver); 195 } 196 module_exit(aat2870_regulator_exit); 197 198 MODULE_DESCRIPTION("AnalogicTech AAT2870 Regulator"); 199 MODULE_LICENSE("GPL"); 200 MODULE_AUTHOR("Jin Park <jinyoungp@nvidia.com>"); 201 MODULE_ALIAS("platform:aat2870-regulator"); 202