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