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/module.h> 13 #include <linux/init.h> 14 #include <linux/err.h> 15 #include <linux/i2c.h> 16 #include <linux/platform_device.h> 17 #include <linux/regulator/driver.h> 18 #include <linux/regulator/machine.h> 19 #include <linux/mfd/max8925.h> 20 21 #define SD1_DVM_VMIN 850000 22 #define SD1_DVM_VMAX 1000000 23 #define SD1_DVM_STEP 50000 24 #define SD1_DVM_SHIFT 5 /* SDCTL1 bit5 */ 25 #define SD1_DVM_EN 6 /* SDV1 bit 6 */ 26 27 /* bit definitions in SD & LDO control registers */ 28 #define OUT_ENABLE 0x1f /* Power U/D sequence as I2C */ 29 #define OUT_DISABLE 0x1e /* Power U/D sequence as I2C */ 30 31 struct max8925_regulator_info { 32 struct regulator_desc desc; 33 struct regulator_dev *regulator; 34 struct i2c_client *i2c; 35 struct max8925_chip *chip; 36 37 int min_uV; 38 int max_uV; 39 int step_uV; 40 int vol_reg; 41 int vol_shift; 42 int vol_nbits; 43 int enable_bit; 44 int enable_reg; 45 }; 46 47 static inline int check_range(struct max8925_regulator_info *info, 48 int min_uV, int max_uV) 49 { 50 if (min_uV < info->min_uV || min_uV > info->max_uV) 51 return -EINVAL; 52 53 return 0; 54 } 55 56 static int max8925_list_voltage(struct regulator_dev *rdev, unsigned index) 57 { 58 struct max8925_regulator_info *info = rdev_get_drvdata(rdev); 59 return info->min_uV + index * info->step_uV; 60 } 61 62 static int max8925_set_voltage(struct regulator_dev *rdev, 63 int min_uV, int max_uV, unsigned int *selector) 64 { 65 struct max8925_regulator_info *info = rdev_get_drvdata(rdev); 66 unsigned char data, mask; 67 68 if (check_range(info, min_uV, max_uV)) { 69 dev_err(info->chip->dev, "invalid voltage range (%d, %d) uV\n", 70 min_uV, max_uV); 71 return -EINVAL; 72 } 73 data = (min_uV - info->min_uV + info->step_uV - 1) / info->step_uV; 74 *selector = data; 75 data <<= info->vol_shift; 76 mask = ((1 << info->vol_nbits) - 1) << info->vol_shift; 77 78 return max8925_set_bits(info->i2c, info->vol_reg, mask, data); 79 } 80 81 static int max8925_get_voltage(struct regulator_dev *rdev) 82 { 83 struct max8925_regulator_info *info = rdev_get_drvdata(rdev); 84 unsigned char data, mask; 85 int ret; 86 87 ret = max8925_reg_read(info->i2c, info->vol_reg); 88 if (ret < 0) 89 return ret; 90 mask = ((1 << info->vol_nbits) - 1) << info->vol_shift; 91 data = (ret & mask) >> info->vol_shift; 92 93 return max8925_list_voltage(rdev, data); 94 } 95 96 static int max8925_enable(struct regulator_dev *rdev) 97 { 98 struct max8925_regulator_info *info = rdev_get_drvdata(rdev); 99 100 return max8925_set_bits(info->i2c, info->enable_reg, 101 OUT_ENABLE << info->enable_bit, 102 OUT_ENABLE << info->enable_bit); 103 } 104 105 static int max8925_disable(struct regulator_dev *rdev) 106 { 107 struct max8925_regulator_info *info = rdev_get_drvdata(rdev); 108 109 return max8925_set_bits(info->i2c, info->enable_reg, 110 OUT_ENABLE << info->enable_bit, 111 OUT_DISABLE << info->enable_bit); 112 } 113 114 static int max8925_is_enabled(struct regulator_dev *rdev) 115 { 116 struct max8925_regulator_info *info = rdev_get_drvdata(rdev); 117 int ret; 118 119 ret = max8925_reg_read(info->i2c, info->enable_reg); 120 if (ret < 0) 121 return ret; 122 123 return ret & (1 << info->enable_bit); 124 } 125 126 static int max8925_set_dvm_voltage(struct regulator_dev *rdev, int uV) 127 { 128 struct max8925_regulator_info *info = rdev_get_drvdata(rdev); 129 unsigned char data, mask; 130 131 if (uV < SD1_DVM_VMIN || uV > SD1_DVM_VMAX) 132 return -EINVAL; 133 134 data = (uV - SD1_DVM_VMIN + SD1_DVM_STEP - 1) / SD1_DVM_STEP; 135 data <<= SD1_DVM_SHIFT; 136 mask = 3 << SD1_DVM_SHIFT; 137 138 return max8925_set_bits(info->i2c, info->enable_reg, mask, data); 139 } 140 141 static int max8925_set_dvm_enable(struct regulator_dev *rdev) 142 { 143 struct max8925_regulator_info *info = rdev_get_drvdata(rdev); 144 145 return max8925_set_bits(info->i2c, info->vol_reg, 1 << SD1_DVM_EN, 146 1 << SD1_DVM_EN); 147 } 148 149 static int max8925_set_dvm_disable(struct regulator_dev *rdev) 150 { 151 struct max8925_regulator_info *info = rdev_get_drvdata(rdev); 152 153 return max8925_set_bits(info->i2c, info->vol_reg, 1 << SD1_DVM_EN, 0); 154 } 155 156 static struct regulator_ops max8925_regulator_sdv_ops = { 157 .set_voltage = max8925_set_voltage, 158 .get_voltage = max8925_get_voltage, 159 .enable = max8925_enable, 160 .disable = max8925_disable, 161 .is_enabled = max8925_is_enabled, 162 .set_suspend_voltage = max8925_set_dvm_voltage, 163 .set_suspend_enable = max8925_set_dvm_enable, 164 .set_suspend_disable = max8925_set_dvm_disable, 165 }; 166 167 static struct regulator_ops max8925_regulator_ldo_ops = { 168 .set_voltage = max8925_set_voltage, 169 .get_voltage = max8925_get_voltage, 170 .enable = max8925_enable, 171 .disable = max8925_disable, 172 .is_enabled = max8925_is_enabled, 173 }; 174 175 #define MAX8925_SDV(_id, min, max, step) \ 176 { \ 177 .desc = { \ 178 .name = "SDV" #_id, \ 179 .ops = &max8925_regulator_sdv_ops, \ 180 .type = REGULATOR_VOLTAGE, \ 181 .id = MAX8925_ID_SD##_id, \ 182 .owner = THIS_MODULE, \ 183 }, \ 184 .min_uV = min * 1000, \ 185 .max_uV = max * 1000, \ 186 .step_uV = step * 1000, \ 187 .vol_reg = MAX8925_SDV##_id, \ 188 .vol_shift = 0, \ 189 .vol_nbits = 6, \ 190 .enable_reg = MAX8925_SDCTL##_id, \ 191 .enable_bit = 0, \ 192 } 193 194 #define MAX8925_LDO(_id, min, max, step) \ 195 { \ 196 .desc = { \ 197 .name = "LDO" #_id, \ 198 .ops = &max8925_regulator_ldo_ops, \ 199 .type = REGULATOR_VOLTAGE, \ 200 .id = MAX8925_ID_LDO##_id, \ 201 .owner = THIS_MODULE, \ 202 }, \ 203 .min_uV = min * 1000, \ 204 .max_uV = max * 1000, \ 205 .step_uV = step * 1000, \ 206 .vol_reg = MAX8925_LDOVOUT##_id, \ 207 .vol_shift = 0, \ 208 .vol_nbits = 6, \ 209 .enable_reg = MAX8925_LDOCTL##_id, \ 210 .enable_bit = 0, \ 211 } 212 213 static struct max8925_regulator_info max8925_regulator_info[] = { 214 MAX8925_SDV(1, 637.5, 1425, 12.5), 215 MAX8925_SDV(2, 650, 2225, 25), 216 MAX8925_SDV(3, 750, 3900, 50), 217 218 MAX8925_LDO(1, 750, 3900, 50), 219 MAX8925_LDO(2, 650, 2250, 25), 220 MAX8925_LDO(3, 650, 2250, 25), 221 MAX8925_LDO(4, 750, 3900, 50), 222 MAX8925_LDO(5, 750, 3900, 50), 223 MAX8925_LDO(6, 750, 3900, 50), 224 MAX8925_LDO(7, 750, 3900, 50), 225 MAX8925_LDO(8, 750, 3900, 50), 226 MAX8925_LDO(9, 750, 3900, 50), 227 MAX8925_LDO(10, 750, 3900, 50), 228 MAX8925_LDO(11, 750, 3900, 50), 229 MAX8925_LDO(12, 750, 3900, 50), 230 MAX8925_LDO(13, 750, 3900, 50), 231 MAX8925_LDO(14, 750, 3900, 50), 232 MAX8925_LDO(15, 750, 3900, 50), 233 MAX8925_LDO(16, 750, 3900, 50), 234 MAX8925_LDO(17, 650, 2250, 25), 235 MAX8925_LDO(18, 650, 2250, 25), 236 MAX8925_LDO(19, 750, 3900, 50), 237 MAX8925_LDO(20, 750, 3900, 50), 238 }; 239 240 static struct max8925_regulator_info * __devinit find_regulator_info(int id) 241 { 242 struct max8925_regulator_info *ri; 243 int i; 244 245 for (i = 0; i < ARRAY_SIZE(max8925_regulator_info); i++) { 246 ri = &max8925_regulator_info[i]; 247 if (ri->desc.id == id) 248 return ri; 249 } 250 return NULL; 251 } 252 253 static int __devinit max8925_regulator_probe(struct platform_device *pdev) 254 { 255 struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent); 256 struct max8925_platform_data *pdata = chip->dev->platform_data; 257 struct max8925_regulator_info *ri; 258 struct regulator_dev *rdev; 259 260 ri = find_regulator_info(pdev->id); 261 if (ri == NULL) { 262 dev_err(&pdev->dev, "invalid regulator ID specified\n"); 263 return -EINVAL; 264 } 265 ri->i2c = chip->i2c; 266 ri->chip = chip; 267 268 rdev = regulator_register(&ri->desc, &pdev->dev, 269 pdata->regulator[pdev->id], ri); 270 if (IS_ERR(rdev)) { 271 dev_err(&pdev->dev, "failed to register regulator %s\n", 272 ri->desc.name); 273 return PTR_ERR(rdev); 274 } 275 276 platform_set_drvdata(pdev, rdev); 277 return 0; 278 } 279 280 static int __devexit max8925_regulator_remove(struct platform_device *pdev) 281 { 282 struct regulator_dev *rdev = platform_get_drvdata(pdev); 283 284 platform_set_drvdata(pdev, NULL); 285 regulator_unregister(rdev); 286 287 return 0; 288 } 289 290 static struct platform_driver max8925_regulator_driver = { 291 .driver = { 292 .name = "max8925-regulator", 293 .owner = THIS_MODULE, 294 }, 295 .probe = max8925_regulator_probe, 296 .remove = __devexit_p(max8925_regulator_remove), 297 }; 298 299 static int __init max8925_regulator_init(void) 300 { 301 return platform_driver_register(&max8925_regulator_driver); 302 } 303 subsys_initcall(max8925_regulator_init); 304 305 static void __exit max8925_regulator_exit(void) 306 { 307 platform_driver_unregister(&max8925_regulator_driver); 308 } 309 module_exit(max8925_regulator_exit); 310 311 MODULE_LICENSE("GPL"); 312 MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>"); 313 MODULE_DESCRIPTION("Regulator Driver for Maxim 8925 PMIC"); 314 MODULE_ALIAS("platform:max8925-regulator"); 315 316