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 const int *voltages; /* uV */ 37 38 int min_uV; 39 int max_uV; 40 41 u8 enable_addr; 42 u8 enable_shift; 43 u8 enable_mask; 44 45 u8 voltage_addr; 46 u8 voltage_shift; 47 u8 voltage_mask; 48 }; 49 50 static int aat2870_ldo_list_voltage(struct regulator_dev *rdev, 51 unsigned selector) 52 { 53 struct aat2870_regulator *ri = rdev_get_drvdata(rdev); 54 55 return ri->voltages[selector]; 56 } 57 58 static int aat2870_ldo_set_voltage_sel(struct regulator_dev *rdev, 59 unsigned selector) 60 { 61 struct aat2870_regulator *ri = rdev_get_drvdata(rdev); 62 struct aat2870_data *aat2870 = ri->aat2870; 63 64 return aat2870->update(aat2870, ri->voltage_addr, ri->voltage_mask, 65 selector << ri->voltage_shift); 66 } 67 68 static int aat2870_ldo_get_voltage_sel(struct regulator_dev *rdev) 69 { 70 struct aat2870_regulator *ri = rdev_get_drvdata(rdev); 71 struct aat2870_data *aat2870 = ri->aat2870; 72 u8 val; 73 int ret; 74 75 ret = aat2870->read(aat2870, ri->voltage_addr, &val); 76 if (ret) 77 return ret; 78 79 return (val & ri->voltage_mask) >> ri->voltage_shift; 80 } 81 82 static int aat2870_ldo_enable(struct regulator_dev *rdev) 83 { 84 struct aat2870_regulator *ri = rdev_get_drvdata(rdev); 85 struct aat2870_data *aat2870 = ri->aat2870; 86 87 return aat2870->update(aat2870, ri->enable_addr, ri->enable_mask, 88 ri->enable_mask); 89 } 90 91 static int aat2870_ldo_disable(struct regulator_dev *rdev) 92 { 93 struct aat2870_regulator *ri = rdev_get_drvdata(rdev); 94 struct aat2870_data *aat2870 = ri->aat2870; 95 96 return aat2870->update(aat2870, ri->enable_addr, ri->enable_mask, 0); 97 } 98 99 static int aat2870_ldo_is_enabled(struct regulator_dev *rdev) 100 { 101 struct aat2870_regulator *ri = rdev_get_drvdata(rdev); 102 struct aat2870_data *aat2870 = ri->aat2870; 103 u8 val; 104 int ret; 105 106 ret = aat2870->read(aat2870, ri->enable_addr, &val); 107 if (ret) 108 return ret; 109 110 return val & ri->enable_mask ? 1 : 0; 111 } 112 113 static struct regulator_ops aat2870_ldo_ops = { 114 .list_voltage = aat2870_ldo_list_voltage, 115 .set_voltage_sel = aat2870_ldo_set_voltage_sel, 116 .get_voltage_sel = aat2870_ldo_get_voltage_sel, 117 .enable = aat2870_ldo_enable, 118 .disable = aat2870_ldo_disable, 119 .is_enabled = aat2870_ldo_is_enabled, 120 }; 121 122 static const int aat2870_ldo_voltages[] = { 123 1200000, 1300000, 1500000, 1600000, 124 1800000, 2000000, 2200000, 2500000, 125 2600000, 2700000, 2800000, 2900000, 126 3000000, 3100000, 3200000, 3300000, 127 }; 128 129 #define AAT2870_LDO(ids) \ 130 { \ 131 .desc = { \ 132 .name = #ids, \ 133 .id = AAT2870_ID_##ids, \ 134 .n_voltages = ARRAY_SIZE(aat2870_ldo_voltages), \ 135 .ops = &aat2870_ldo_ops, \ 136 .type = REGULATOR_VOLTAGE, \ 137 .owner = THIS_MODULE, \ 138 }, \ 139 .voltages = aat2870_ldo_voltages, \ 140 .min_uV = 1200000, \ 141 .max_uV = 3300000, \ 142 } 143 144 static struct aat2870_regulator aat2870_regulators[] = { 145 AAT2870_LDO(LDOA), 146 AAT2870_LDO(LDOB), 147 AAT2870_LDO(LDOC), 148 AAT2870_LDO(LDOD), 149 }; 150 151 static struct aat2870_regulator *aat2870_get_regulator(int id) 152 { 153 struct aat2870_regulator *ri = NULL; 154 int i; 155 156 for (i = 0; i < ARRAY_SIZE(aat2870_regulators); i++) { 157 ri = &aat2870_regulators[i]; 158 if (ri->desc.id == id) 159 break; 160 } 161 162 if (i == ARRAY_SIZE(aat2870_regulators)) 163 return NULL; 164 165 ri->enable_addr = AAT2870_LDO_EN; 166 ri->enable_shift = id - AAT2870_ID_LDOA; 167 ri->enable_mask = 0x1 << ri->enable_shift; 168 169 ri->voltage_addr = (id - AAT2870_ID_LDOA) / 2 ? 170 AAT2870_LDO_CD : AAT2870_LDO_AB; 171 ri->voltage_shift = (id - AAT2870_ID_LDOA) % 2 ? 0 : 4; 172 ri->voltage_mask = 0xF << ri->voltage_shift; 173 174 return ri; 175 } 176 177 static int aat2870_regulator_probe(struct platform_device *pdev) 178 { 179 struct aat2870_regulator *ri; 180 struct regulator_config config = { 0 }; 181 struct regulator_dev *rdev; 182 183 ri = aat2870_get_regulator(pdev->id); 184 if (!ri) { 185 dev_err(&pdev->dev, "Invalid device ID, %d\n", pdev->id); 186 return -EINVAL; 187 } 188 ri->aat2870 = dev_get_drvdata(pdev->dev.parent); 189 190 config.dev = &pdev->dev; 191 config.driver_data = ri; 192 config.init_data = pdev->dev.platform_data; 193 194 rdev = regulator_register(&ri->desc, &config); 195 if (IS_ERR(rdev)) { 196 dev_err(&pdev->dev, "Failed to register regulator %s\n", 197 ri->desc.name); 198 return PTR_ERR(rdev); 199 } 200 platform_set_drvdata(pdev, rdev); 201 202 return 0; 203 } 204 205 static int __devexit aat2870_regulator_remove(struct platform_device *pdev) 206 { 207 struct regulator_dev *rdev = platform_get_drvdata(pdev); 208 209 regulator_unregister(rdev); 210 return 0; 211 } 212 213 static struct platform_driver aat2870_regulator_driver = { 214 .driver = { 215 .name = "aat2870-regulator", 216 .owner = THIS_MODULE, 217 }, 218 .probe = aat2870_regulator_probe, 219 .remove = __devexit_p(aat2870_regulator_remove), 220 }; 221 222 static int __init aat2870_regulator_init(void) 223 { 224 return platform_driver_register(&aat2870_regulator_driver); 225 } 226 subsys_initcall(aat2870_regulator_init); 227 228 static void __exit aat2870_regulator_exit(void) 229 { 230 platform_driver_unregister(&aat2870_regulator_driver); 231 } 232 module_exit(aat2870_regulator_exit); 233 234 MODULE_DESCRIPTION("AnalogicTech AAT2870 Regulator"); 235 MODULE_LICENSE("GPL"); 236 MODULE_AUTHOR("Jin Park <jinyoungp@nvidia.com>"); 237 MODULE_ALIAS("platform:aat2870-regulator"); 238