1 /* 2 * Regulators driver for Maxim max8925 3 * 4 * Copyright (C) 2009 Marvell International Ltd. 5 * Haojian Zhuang <haojian.zhuang@marvell.com> 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License version 2 as 9 * published by the Free Software Foundation. 10 */ 11 #include <linux/kernel.h> 12 #include <linux/init.h> 13 #include <linux/err.h> 14 #include <linux/i2c.h> 15 #include <linux/platform_device.h> 16 #include <linux/regulator/driver.h> 17 #include <linux/regulator/machine.h> 18 #include <linux/mfd/max8925.h> 19 20 #define SD1_DVM_VMIN 850000 21 #define SD1_DVM_VMAX 1000000 22 #define SD1_DVM_STEP 50000 23 #define SD1_DVM_SHIFT 5 /* SDCTL1 bit5 */ 24 #define SD1_DVM_EN 6 /* SDV1 bit 6 */ 25 26 struct max8925_regulator_info { 27 struct regulator_desc desc; 28 struct regulator_dev *regulator; 29 struct i2c_client *i2c; 30 struct max8925_chip *chip; 31 32 int min_uV; 33 int max_uV; 34 int step_uV; 35 int vol_reg; 36 int vol_shift; 37 int vol_nbits; 38 int enable_bit; 39 int enable_reg; 40 }; 41 42 static inline int check_range(struct max8925_regulator_info *info, 43 int min_uV, int max_uV) 44 { 45 if (min_uV < info->min_uV || min_uV > info->max_uV) 46 return -EINVAL; 47 48 return 0; 49 } 50 51 static int max8925_list_voltage(struct regulator_dev *rdev, unsigned index) 52 { 53 struct max8925_regulator_info *info = rdev_get_drvdata(rdev); 54 return info->min_uV + index * info->step_uV; 55 } 56 57 static int max8925_set_voltage(struct regulator_dev *rdev, 58 int min_uV, int max_uV, unsigned int *selector) 59 { 60 struct max8925_regulator_info *info = rdev_get_drvdata(rdev); 61 unsigned char data, mask; 62 63 if (check_range(info, min_uV, max_uV)) { 64 dev_err(info->chip->dev, "invalid voltage range (%d, %d) uV\n", 65 min_uV, max_uV); 66 return -EINVAL; 67 } 68 data = (min_uV - info->min_uV + info->step_uV - 1) / info->step_uV; 69 *selector = data; 70 data <<= info->vol_shift; 71 mask = ((1 << info->vol_nbits) - 1) << info->vol_shift; 72 73 return max8925_set_bits(info->i2c, info->vol_reg, mask, data); 74 } 75 76 static int max8925_get_voltage(struct regulator_dev *rdev) 77 { 78 struct max8925_regulator_info *info = rdev_get_drvdata(rdev); 79 unsigned char data, mask; 80 int ret; 81 82 ret = max8925_reg_read(info->i2c, info->vol_reg); 83 if (ret < 0) 84 return ret; 85 mask = ((1 << info->vol_nbits) - 1) << info->vol_shift; 86 data = (ret & mask) >> info->vol_shift; 87 88 return max8925_list_voltage(rdev, data); 89 } 90 91 static int max8925_enable(struct regulator_dev *rdev) 92 { 93 struct max8925_regulator_info *info = rdev_get_drvdata(rdev); 94 95 return max8925_set_bits(info->i2c, info->enable_reg, 96 1 << info->enable_bit, 97 1 << info->enable_bit); 98 } 99 100 static int max8925_disable(struct regulator_dev *rdev) 101 { 102 struct max8925_regulator_info *info = rdev_get_drvdata(rdev); 103 104 return max8925_set_bits(info->i2c, info->enable_reg, 105 1 << info->enable_bit, 0); 106 } 107 108 static int max8925_is_enabled(struct regulator_dev *rdev) 109 { 110 struct max8925_regulator_info *info = rdev_get_drvdata(rdev); 111 int ret; 112 113 ret = max8925_reg_read(info->i2c, info->enable_reg); 114 if (ret < 0) 115 return ret; 116 117 return ret & (1 << info->enable_bit); 118 } 119 120 static int max8925_set_dvm_voltage(struct regulator_dev *rdev, int uV) 121 { 122 struct max8925_regulator_info *info = rdev_get_drvdata(rdev); 123 unsigned char data, mask; 124 125 if (uV < SD1_DVM_VMIN || uV > SD1_DVM_VMAX) 126 return -EINVAL; 127 128 data = (uV - SD1_DVM_VMIN + SD1_DVM_STEP - 1) / SD1_DVM_STEP; 129 data <<= SD1_DVM_SHIFT; 130 mask = 3 << SD1_DVM_SHIFT; 131 132 return max8925_set_bits(info->i2c, info->enable_reg, mask, data); 133 } 134 135 static int max8925_set_dvm_enable(struct regulator_dev *rdev) 136 { 137 struct max8925_regulator_info *info = rdev_get_drvdata(rdev); 138 139 return max8925_set_bits(info->i2c, info->vol_reg, 1 << SD1_DVM_EN, 140 1 << SD1_DVM_EN); 141 } 142 143 static int max8925_set_dvm_disable(struct regulator_dev *rdev) 144 { 145 struct max8925_regulator_info *info = rdev_get_drvdata(rdev); 146 147 return max8925_set_bits(info->i2c, info->vol_reg, 1 << SD1_DVM_EN, 0); 148 } 149 150 static struct regulator_ops max8925_regulator_sdv_ops = { 151 .set_voltage = max8925_set_voltage, 152 .get_voltage = max8925_get_voltage, 153 .enable = max8925_enable, 154 .disable = max8925_disable, 155 .is_enabled = max8925_is_enabled, 156 .set_suspend_voltage = max8925_set_dvm_voltage, 157 .set_suspend_enable = max8925_set_dvm_enable, 158 .set_suspend_disable = max8925_set_dvm_disable, 159 }; 160 161 static struct regulator_ops max8925_regulator_ldo_ops = { 162 .set_voltage = max8925_set_voltage, 163 .get_voltage = max8925_get_voltage, 164 .enable = max8925_enable, 165 .disable = max8925_disable, 166 .is_enabled = max8925_is_enabled, 167 }; 168 169 #define MAX8925_SDV(_id, min, max, step) \ 170 { \ 171 .desc = { \ 172 .name = "SDV" #_id, \ 173 .ops = &max8925_regulator_sdv_ops, \ 174 .type = REGULATOR_VOLTAGE, \ 175 .id = MAX8925_ID_SD##_id, \ 176 .owner = THIS_MODULE, \ 177 }, \ 178 .min_uV = min * 1000, \ 179 .max_uV = max * 1000, \ 180 .step_uV = step * 1000, \ 181 .vol_reg = MAX8925_SDV##_id, \ 182 .vol_shift = 0, \ 183 .vol_nbits = 6, \ 184 .enable_reg = MAX8925_SDCTL##_id, \ 185 .enable_bit = 0, \ 186 } 187 188 #define MAX8925_LDO(_id, min, max, step) \ 189 { \ 190 .desc = { \ 191 .name = "LDO" #_id, \ 192 .ops = &max8925_regulator_ldo_ops, \ 193 .type = REGULATOR_VOLTAGE, \ 194 .id = MAX8925_ID_LDO##_id, \ 195 .owner = THIS_MODULE, \ 196 }, \ 197 .min_uV = min * 1000, \ 198 .max_uV = max * 1000, \ 199 .step_uV = step * 1000, \ 200 .vol_reg = MAX8925_LDOVOUT##_id, \ 201 .vol_shift = 0, \ 202 .vol_nbits = 6, \ 203 .enable_reg = MAX8925_LDOCTL##_id, \ 204 .enable_bit = 0, \ 205 } 206 207 static struct max8925_regulator_info max8925_regulator_info[] = { 208 MAX8925_SDV(1, 637.5, 1425, 12.5), 209 MAX8925_SDV(2, 650, 2225, 25), 210 MAX8925_SDV(3, 750, 3900, 50), 211 212 MAX8925_LDO(1, 750, 3900, 50), 213 MAX8925_LDO(2, 650, 2250, 25), 214 MAX8925_LDO(3, 650, 2250, 25), 215 MAX8925_LDO(4, 750, 3900, 50), 216 MAX8925_LDO(5, 750, 3900, 50), 217 MAX8925_LDO(6, 750, 3900, 50), 218 MAX8925_LDO(7, 750, 3900, 50), 219 MAX8925_LDO(8, 750, 3900, 50), 220 MAX8925_LDO(9, 750, 3900, 50), 221 MAX8925_LDO(10, 750, 3900, 50), 222 MAX8925_LDO(11, 750, 3900, 50), 223 MAX8925_LDO(12, 750, 3900, 50), 224 MAX8925_LDO(13, 750, 3900, 50), 225 MAX8925_LDO(14, 750, 3900, 50), 226 MAX8925_LDO(15, 750, 3900, 50), 227 MAX8925_LDO(16, 750, 3900, 50), 228 MAX8925_LDO(17, 650, 2250, 25), 229 MAX8925_LDO(18, 650, 2250, 25), 230 MAX8925_LDO(19, 750, 3900, 50), 231 MAX8925_LDO(20, 750, 3900, 50), 232 }; 233 234 static struct max8925_regulator_info * __devinit find_regulator_info(int id) 235 { 236 struct max8925_regulator_info *ri; 237 int i; 238 239 for (i = 0; i < ARRAY_SIZE(max8925_regulator_info); i++) { 240 ri = &max8925_regulator_info[i]; 241 if (ri->desc.id == id) 242 return ri; 243 } 244 return NULL; 245 } 246 247 static int __devinit max8925_regulator_probe(struct platform_device *pdev) 248 { 249 struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent); 250 struct max8925_platform_data *pdata = chip->dev->platform_data; 251 struct max8925_regulator_info *ri; 252 struct regulator_dev *rdev; 253 254 ri = find_regulator_info(pdev->id); 255 if (ri == NULL) { 256 dev_err(&pdev->dev, "invalid regulator ID specified\n"); 257 return -EINVAL; 258 } 259 ri->i2c = chip->i2c; 260 ri->chip = chip; 261 262 rdev = regulator_register(&ri->desc, &pdev->dev, 263 pdata->regulator[pdev->id], ri); 264 if (IS_ERR(rdev)) { 265 dev_err(&pdev->dev, "failed to register regulator %s\n", 266 ri->desc.name); 267 return PTR_ERR(rdev); 268 } 269 270 platform_set_drvdata(pdev, rdev); 271 return 0; 272 } 273 274 static int __devexit max8925_regulator_remove(struct platform_device *pdev) 275 { 276 struct regulator_dev *rdev = platform_get_drvdata(pdev); 277 278 platform_set_drvdata(pdev, NULL); 279 regulator_unregister(rdev); 280 281 return 0; 282 } 283 284 static struct platform_driver max8925_regulator_driver = { 285 .driver = { 286 .name = "max8925-regulator", 287 .owner = THIS_MODULE, 288 }, 289 .probe = max8925_regulator_probe, 290 .remove = __devexit_p(max8925_regulator_remove), 291 }; 292 293 static int __init max8925_regulator_init(void) 294 { 295 return platform_driver_register(&max8925_regulator_driver); 296 } 297 subsys_initcall(max8925_regulator_init); 298 299 static void __exit max8925_regulator_exit(void) 300 { 301 platform_driver_unregister(&max8925_regulator_driver); 302 } 303 module_exit(max8925_regulator_exit); 304 305 MODULE_LICENSE("GPL"); 306 MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>"); 307 MODULE_DESCRIPTION("Regulator Driver for Maxim 8925 PMIC"); 308 MODULE_ALIAS("platform:max8925-regulator"); 309 310