1 /* 2 * linux/drivers/regulator/aat2870-regulator.c 3 * 4 * Copyright (c) 2011, NVIDIA Corporation. 5 * Author: Jin Park <jinyoungp@nvidia.com> 6 * 7 * This program is free software; you can redistribute it and/or 8 * modify it under the terms of the GNU General Public License 9 * version 2 as published by the Free Software Foundation. 10 * 11 * This program is distributed in the hope that it will be useful, but 12 * WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14 * General Public License for more details. 15 * 16 * You should have received a copy of the GNU General Public License 17 * along with this program; if not, write to the Free Software 18 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 19 * 02110-1301 USA 20 */ 21 22 #include <linux/kernel.h> 23 #include <linux/init.h> 24 #include <linux/err.h> 25 #include <linux/module.h> 26 #include <linux/slab.h> 27 #include <linux/platform_device.h> 28 #include <linux/regulator/driver.h> 29 #include <linux/regulator/machine.h> 30 #include <linux/mfd/aat2870.h> 31 32 struct aat2870_regulator { 33 struct aat2870_data *aat2870; 34 struct regulator_desc desc; 35 36 u8 enable_addr; 37 u8 enable_shift; 38 u8 enable_mask; 39 40 u8 voltage_addr; 41 u8 voltage_shift; 42 u8 voltage_mask; 43 }; 44 45 static int aat2870_ldo_set_voltage_sel(struct regulator_dev *rdev, 46 unsigned selector) 47 { 48 struct aat2870_regulator *ri = rdev_get_drvdata(rdev); 49 struct aat2870_data *aat2870 = ri->aat2870; 50 51 return aat2870->update(aat2870, ri->voltage_addr, ri->voltage_mask, 52 selector << ri->voltage_shift); 53 } 54 55 static int aat2870_ldo_get_voltage_sel(struct regulator_dev *rdev) 56 { 57 struct aat2870_regulator *ri = rdev_get_drvdata(rdev); 58 struct aat2870_data *aat2870 = ri->aat2870; 59 u8 val; 60 int ret; 61 62 ret = aat2870->read(aat2870, ri->voltage_addr, &val); 63 if (ret) 64 return ret; 65 66 return (val & ri->voltage_mask) >> ri->voltage_shift; 67 } 68 69 static int aat2870_ldo_enable(struct regulator_dev *rdev) 70 { 71 struct aat2870_regulator *ri = rdev_get_drvdata(rdev); 72 struct aat2870_data *aat2870 = ri->aat2870; 73 74 return aat2870->update(aat2870, ri->enable_addr, ri->enable_mask, 75 ri->enable_mask); 76 } 77 78 static int aat2870_ldo_disable(struct regulator_dev *rdev) 79 { 80 struct aat2870_regulator *ri = rdev_get_drvdata(rdev); 81 struct aat2870_data *aat2870 = ri->aat2870; 82 83 return aat2870->update(aat2870, ri->enable_addr, ri->enable_mask, 0); 84 } 85 86 static int aat2870_ldo_is_enabled(struct regulator_dev *rdev) 87 { 88 struct aat2870_regulator *ri = rdev_get_drvdata(rdev); 89 struct aat2870_data *aat2870 = ri->aat2870; 90 u8 val; 91 int ret; 92 93 ret = aat2870->read(aat2870, ri->enable_addr, &val); 94 if (ret) 95 return ret; 96 97 return val & ri->enable_mask ? 1 : 0; 98 } 99 100 static struct regulator_ops aat2870_ldo_ops = { 101 .list_voltage = regulator_list_voltage_table, 102 .set_voltage_sel = aat2870_ldo_set_voltage_sel, 103 .get_voltage_sel = aat2870_ldo_get_voltage_sel, 104 .enable = aat2870_ldo_enable, 105 .disable = aat2870_ldo_disable, 106 .is_enabled = aat2870_ldo_is_enabled, 107 }; 108 109 static const unsigned int aat2870_ldo_voltages[] = { 110 1200000, 1300000, 1500000, 1600000, 111 1800000, 2000000, 2200000, 2500000, 112 2600000, 2700000, 2800000, 2900000, 113 3000000, 3100000, 3200000, 3300000, 114 }; 115 116 #define AAT2870_LDO(ids) \ 117 { \ 118 .desc = { \ 119 .name = #ids, \ 120 .id = AAT2870_ID_##ids, \ 121 .n_voltages = ARRAY_SIZE(aat2870_ldo_voltages), \ 122 .volt_table = aat2870_ldo_voltages, \ 123 .ops = &aat2870_ldo_ops, \ 124 .type = REGULATOR_VOLTAGE, \ 125 .owner = THIS_MODULE, \ 126 }, \ 127 } 128 129 static struct aat2870_regulator aat2870_regulators[] = { 130 AAT2870_LDO(LDOA), 131 AAT2870_LDO(LDOB), 132 AAT2870_LDO(LDOC), 133 AAT2870_LDO(LDOD), 134 }; 135 136 static struct aat2870_regulator *aat2870_get_regulator(int id) 137 { 138 struct aat2870_regulator *ri = NULL; 139 int i; 140 141 for (i = 0; i < ARRAY_SIZE(aat2870_regulators); i++) { 142 ri = &aat2870_regulators[i]; 143 if (ri->desc.id == id) 144 break; 145 } 146 147 if (i == ARRAY_SIZE(aat2870_regulators)) 148 return NULL; 149 150 ri->enable_addr = AAT2870_LDO_EN; 151 ri->enable_shift = id - AAT2870_ID_LDOA; 152 ri->enable_mask = 0x1 << ri->enable_shift; 153 154 ri->voltage_addr = (id - AAT2870_ID_LDOA) / 2 ? 155 AAT2870_LDO_CD : AAT2870_LDO_AB; 156 ri->voltage_shift = (id - AAT2870_ID_LDOA) % 2 ? 0 : 4; 157 ri->voltage_mask = 0xF << ri->voltage_shift; 158 159 return ri; 160 } 161 162 static int aat2870_regulator_probe(struct platform_device *pdev) 163 { 164 struct aat2870_regulator *ri; 165 struct regulator_config config = { }; 166 struct regulator_dev *rdev; 167 168 ri = aat2870_get_regulator(pdev->id); 169 if (!ri) { 170 dev_err(&pdev->dev, "Invalid device ID, %d\n", pdev->id); 171 return -EINVAL; 172 } 173 ri->aat2870 = dev_get_drvdata(pdev->dev.parent); 174 175 config.dev = &pdev->dev; 176 config.driver_data = ri; 177 config.init_data = pdev->dev.platform_data; 178 179 rdev = regulator_register(&ri->desc, &config); 180 if (IS_ERR(rdev)) { 181 dev_err(&pdev->dev, "Failed to register regulator %s\n", 182 ri->desc.name); 183 return PTR_ERR(rdev); 184 } 185 platform_set_drvdata(pdev, rdev); 186 187 return 0; 188 } 189 190 static int aat2870_regulator_remove(struct platform_device *pdev) 191 { 192 struct regulator_dev *rdev = platform_get_drvdata(pdev); 193 194 regulator_unregister(rdev); 195 return 0; 196 } 197 198 static struct platform_driver aat2870_regulator_driver = { 199 .driver = { 200 .name = "aat2870-regulator", 201 .owner = THIS_MODULE, 202 }, 203 .probe = aat2870_regulator_probe, 204 .remove = aat2870_regulator_remove, 205 }; 206 207 static int __init aat2870_regulator_init(void) 208 { 209 return platform_driver_register(&aat2870_regulator_driver); 210 } 211 subsys_initcall(aat2870_regulator_init); 212 213 static void __exit aat2870_regulator_exit(void) 214 { 215 platform_driver_unregister(&aat2870_regulator_driver); 216 } 217 module_exit(aat2870_regulator_exit); 218 219 MODULE_DESCRIPTION("AnalogicTech AAT2870 Regulator"); 220 MODULE_LICENSE("GPL"); 221 MODULE_AUTHOR("Jin Park <jinyoungp@nvidia.com>"); 222 MODULE_ALIAS("platform:aat2870-regulator"); 223