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/delay.h> 28 #include <linux/platform_device.h> 29 #include <linux/regulator/driver.h> 30 #include <linux/regulator/machine.h> 31 #include <linux/mfd/aat2870.h> 32 33 struct aat2870_regulator { 34 struct aat2870_data *aat2870; 35 struct regulator_desc desc; 36 37 const int *voltages; /* uV */ 38 39 int min_uV; 40 int max_uV; 41 42 u8 enable_addr; 43 u8 enable_shift; 44 u8 enable_mask; 45 46 u8 voltage_addr; 47 u8 voltage_shift; 48 u8 voltage_mask; 49 }; 50 51 static int aat2870_ldo_list_voltage(struct regulator_dev *rdev, 52 unsigned selector) 53 { 54 struct aat2870_regulator *ri = rdev_get_drvdata(rdev); 55 56 return ri->voltages[selector]; 57 } 58 59 static int aat2870_ldo_set_voltage_sel(struct regulator_dev *rdev, 60 unsigned selector) 61 { 62 struct aat2870_regulator *ri = rdev_get_drvdata(rdev); 63 struct aat2870_data *aat2870 = ri->aat2870; 64 65 return aat2870->update(aat2870, ri->voltage_addr, ri->voltage_mask, 66 selector << ri->voltage_shift); 67 } 68 69 static int aat2870_ldo_get_voltage_sel(struct regulator_dev *rdev) 70 { 71 struct aat2870_regulator *ri = rdev_get_drvdata(rdev); 72 struct aat2870_data *aat2870 = ri->aat2870; 73 u8 val; 74 int ret; 75 76 ret = aat2870->read(aat2870, ri->voltage_addr, &val); 77 if (ret) 78 return ret; 79 80 return (val & ri->voltage_mask) >> ri->voltage_shift; 81 } 82 83 static int aat2870_ldo_enable(struct regulator_dev *rdev) 84 { 85 struct aat2870_regulator *ri = rdev_get_drvdata(rdev); 86 struct aat2870_data *aat2870 = ri->aat2870; 87 88 return aat2870->update(aat2870, ri->enable_addr, ri->enable_mask, 89 ri->enable_mask); 90 } 91 92 static int aat2870_ldo_disable(struct regulator_dev *rdev) 93 { 94 struct aat2870_regulator *ri = rdev_get_drvdata(rdev); 95 struct aat2870_data *aat2870 = ri->aat2870; 96 97 return aat2870->update(aat2870, ri->enable_addr, ri->enable_mask, 0); 98 } 99 100 static int aat2870_ldo_is_enabled(struct regulator_dev *rdev) 101 { 102 struct aat2870_regulator *ri = rdev_get_drvdata(rdev); 103 struct aat2870_data *aat2870 = ri->aat2870; 104 u8 val; 105 int ret; 106 107 ret = aat2870->read(aat2870, ri->enable_addr, &val); 108 if (ret) 109 return ret; 110 111 return val & ri->enable_mask ? 1 : 0; 112 } 113 114 static struct regulator_ops aat2870_ldo_ops = { 115 .list_voltage = aat2870_ldo_list_voltage, 116 .set_voltage_sel = aat2870_ldo_set_voltage_sel, 117 .get_voltage_sel = aat2870_ldo_get_voltage_sel, 118 .enable = aat2870_ldo_enable, 119 .disable = aat2870_ldo_disable, 120 .is_enabled = aat2870_ldo_is_enabled, 121 }; 122 123 static const int aat2870_ldo_voltages[] = { 124 1200000, 1300000, 1500000, 1600000, 125 1800000, 2000000, 2200000, 2500000, 126 2600000, 2700000, 2800000, 2900000, 127 3000000, 3100000, 3200000, 3300000, 128 }; 129 130 #define AAT2870_LDO(ids) \ 131 { \ 132 .desc = { \ 133 .name = #ids, \ 134 .id = AAT2870_ID_##ids, \ 135 .n_voltages = ARRAY_SIZE(aat2870_ldo_voltages), \ 136 .ops = &aat2870_ldo_ops, \ 137 .type = REGULATOR_VOLTAGE, \ 138 .owner = THIS_MODULE, \ 139 }, \ 140 .voltages = aat2870_ldo_voltages, \ 141 .min_uV = 1200000, \ 142 .max_uV = 3300000, \ 143 } 144 145 static struct aat2870_regulator aat2870_regulators[] = { 146 AAT2870_LDO(LDOA), 147 AAT2870_LDO(LDOB), 148 AAT2870_LDO(LDOC), 149 AAT2870_LDO(LDOD), 150 }; 151 152 static struct aat2870_regulator *aat2870_get_regulator(int id) 153 { 154 struct aat2870_regulator *ri = NULL; 155 int i; 156 157 for (i = 0; i < ARRAY_SIZE(aat2870_regulators); i++) { 158 ri = &aat2870_regulators[i]; 159 if (ri->desc.id == id) 160 break; 161 } 162 163 if (i == ARRAY_SIZE(aat2870_regulators)) 164 return NULL; 165 166 ri->enable_addr = AAT2870_LDO_EN; 167 ri->enable_shift = id - AAT2870_ID_LDOA; 168 ri->enable_mask = 0x1 << ri->enable_shift; 169 170 ri->voltage_addr = (id - AAT2870_ID_LDOA) / 2 ? 171 AAT2870_LDO_CD : AAT2870_LDO_AB; 172 ri->voltage_shift = (id - AAT2870_ID_LDOA) % 2 ? 0 : 4; 173 ri->voltage_mask = 0xF << ri->voltage_shift; 174 175 return ri; 176 } 177 178 static int aat2870_regulator_probe(struct platform_device *pdev) 179 { 180 struct aat2870_regulator *ri; 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 rdev = regulator_register(&ri->desc, &pdev->dev, 191 pdev->dev.platform_data, ri, NULL); 192 if (IS_ERR(rdev)) { 193 dev_err(&pdev->dev, "Failed to register regulator %s\n", 194 ri->desc.name); 195 return PTR_ERR(rdev); 196 } 197 platform_set_drvdata(pdev, rdev); 198 199 return 0; 200 } 201 202 static int __devexit aat2870_regulator_remove(struct platform_device *pdev) 203 { 204 struct regulator_dev *rdev = platform_get_drvdata(pdev); 205 206 regulator_unregister(rdev); 207 return 0; 208 } 209 210 static struct platform_driver aat2870_regulator_driver = { 211 .driver = { 212 .name = "aat2870-regulator", 213 .owner = THIS_MODULE, 214 }, 215 .probe = aat2870_regulator_probe, 216 .remove = __devexit_p(aat2870_regulator_remove), 217 }; 218 219 static int __init aat2870_regulator_init(void) 220 { 221 return platform_driver_register(&aat2870_regulator_driver); 222 } 223 subsys_initcall(aat2870_regulator_init); 224 225 static void __exit aat2870_regulator_exit(void) 226 { 227 platform_driver_unregister(&aat2870_regulator_driver); 228 } 229 module_exit(aat2870_regulator_exit); 230 231 MODULE_DESCRIPTION("AnalogicTech AAT2870 Regulator"); 232 MODULE_LICENSE("GPL"); 233 MODULE_AUTHOR("Jin Park <jinyoungp@nvidia.com>"); 234