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 #include <linux/of.h> 21 #include <linux/regulator/of_regulator.h> 22 23 #define SD1_DVM_VMIN 850000 24 #define SD1_DVM_VMAX 1000000 25 #define SD1_DVM_STEP 50000 26 #define SD1_DVM_SHIFT 5 /* SDCTL1 bit5 */ 27 #define SD1_DVM_EN 6 /* SDV1 bit 6 */ 28 29 /* bit definitions in LDO control registers */ 30 #define LDO_SEQ_I2C 0x7 /* Power U/D by i2c */ 31 #define LDO_SEQ_MASK 0x7 /* Power U/D sequence mask */ 32 #define LDO_SEQ_SHIFT 2 /* Power U/D sequence offset */ 33 #define LDO_I2C_EN 0x1 /* Enable by i2c */ 34 #define LDO_I2C_EN_MASK 0x1 /* Enable mask by i2c */ 35 #define LDO_I2C_EN_SHIFT 0 /* Enable offset by i2c */ 36 37 struct max8925_regulator_info { 38 struct regulator_desc desc; 39 struct regulator_dev *regulator; 40 struct i2c_client *i2c; 41 struct max8925_chip *chip; 42 43 int vol_reg; 44 int enable_reg; 45 }; 46 47 static int max8925_set_voltage_sel(struct regulator_dev *rdev, 48 unsigned int selector) 49 { 50 struct max8925_regulator_info *info = rdev_get_drvdata(rdev); 51 unsigned char mask = rdev->desc->n_voltages - 1; 52 53 return max8925_set_bits(info->i2c, info->vol_reg, mask, selector); 54 } 55 56 static int max8925_get_voltage_sel(struct regulator_dev *rdev) 57 { 58 struct max8925_regulator_info *info = rdev_get_drvdata(rdev); 59 unsigned char data, mask; 60 int ret; 61 62 ret = max8925_reg_read(info->i2c, info->vol_reg); 63 if (ret < 0) 64 return ret; 65 mask = rdev->desc->n_voltages - 1; 66 data = ret & mask; 67 68 return data; 69 } 70 71 static int max8925_enable(struct regulator_dev *rdev) 72 { 73 struct max8925_regulator_info *info = rdev_get_drvdata(rdev); 74 75 return max8925_set_bits(info->i2c, info->enable_reg, 76 LDO_SEQ_MASK << LDO_SEQ_SHIFT | 77 LDO_I2C_EN_MASK << LDO_I2C_EN_SHIFT, 78 LDO_SEQ_I2C << LDO_SEQ_SHIFT | 79 LDO_I2C_EN << LDO_I2C_EN_SHIFT); 80 } 81 82 static int max8925_disable(struct regulator_dev *rdev) 83 { 84 struct max8925_regulator_info *info = rdev_get_drvdata(rdev); 85 86 return max8925_set_bits(info->i2c, info->enable_reg, 87 LDO_SEQ_MASK << LDO_SEQ_SHIFT | 88 LDO_I2C_EN_MASK << LDO_I2C_EN_SHIFT, 89 LDO_SEQ_I2C << LDO_SEQ_SHIFT); 90 } 91 92 static int max8925_is_enabled(struct regulator_dev *rdev) 93 { 94 struct max8925_regulator_info *info = rdev_get_drvdata(rdev); 95 int ldo_seq, ret; 96 97 ret = max8925_reg_read(info->i2c, info->enable_reg); 98 if (ret < 0) 99 return ret; 100 ldo_seq = (ret >> LDO_SEQ_SHIFT) & LDO_SEQ_MASK; 101 if (ldo_seq != LDO_SEQ_I2C) 102 return 1; 103 else 104 return ret & (LDO_I2C_EN_MASK << LDO_I2C_EN_SHIFT); 105 } 106 107 static int max8925_set_dvm_voltage(struct regulator_dev *rdev, int uV) 108 { 109 struct max8925_regulator_info *info = rdev_get_drvdata(rdev); 110 unsigned char data, mask; 111 112 if (uV < SD1_DVM_VMIN || uV > SD1_DVM_VMAX) 113 return -EINVAL; 114 115 data = DIV_ROUND_UP(uV - SD1_DVM_VMIN, SD1_DVM_STEP); 116 data <<= SD1_DVM_SHIFT; 117 mask = 3 << SD1_DVM_SHIFT; 118 119 return max8925_set_bits(info->i2c, info->enable_reg, mask, data); 120 } 121 122 static int max8925_set_dvm_enable(struct regulator_dev *rdev) 123 { 124 struct max8925_regulator_info *info = rdev_get_drvdata(rdev); 125 126 return max8925_set_bits(info->i2c, info->vol_reg, 1 << SD1_DVM_EN, 127 1 << SD1_DVM_EN); 128 } 129 130 static int max8925_set_dvm_disable(struct regulator_dev *rdev) 131 { 132 struct max8925_regulator_info *info = rdev_get_drvdata(rdev); 133 134 return max8925_set_bits(info->i2c, info->vol_reg, 1 << SD1_DVM_EN, 0); 135 } 136 137 static struct regulator_ops max8925_regulator_sdv_ops = { 138 .map_voltage = regulator_map_voltage_linear, 139 .list_voltage = regulator_list_voltage_linear, 140 .set_voltage_sel = max8925_set_voltage_sel, 141 .get_voltage_sel = max8925_get_voltage_sel, 142 .enable = max8925_enable, 143 .disable = max8925_disable, 144 .is_enabled = max8925_is_enabled, 145 .set_suspend_voltage = max8925_set_dvm_voltage, 146 .set_suspend_enable = max8925_set_dvm_enable, 147 .set_suspend_disable = max8925_set_dvm_disable, 148 }; 149 150 static struct regulator_ops max8925_regulator_ldo_ops = { 151 .map_voltage = regulator_map_voltage_linear, 152 .list_voltage = regulator_list_voltage_linear, 153 .set_voltage_sel = max8925_set_voltage_sel, 154 .get_voltage_sel = max8925_get_voltage_sel, 155 .enable = max8925_enable, 156 .disable = max8925_disable, 157 .is_enabled = max8925_is_enabled, 158 }; 159 160 #define MAX8925_SDV(_id, min, max, step) \ 161 { \ 162 .desc = { \ 163 .name = "SDV" #_id, \ 164 .ops = &max8925_regulator_sdv_ops, \ 165 .type = REGULATOR_VOLTAGE, \ 166 .id = MAX8925_ID_SD##_id, \ 167 .owner = THIS_MODULE, \ 168 .n_voltages = 64, \ 169 .min_uV = min * 1000, \ 170 .uV_step = step * 1000, \ 171 }, \ 172 .vol_reg = MAX8925_SDV##_id, \ 173 .enable_reg = MAX8925_SDCTL##_id, \ 174 } 175 176 #define MAX8925_LDO(_id, min, max, step) \ 177 { \ 178 .desc = { \ 179 .name = "LDO" #_id, \ 180 .ops = &max8925_regulator_ldo_ops, \ 181 .type = REGULATOR_VOLTAGE, \ 182 .id = MAX8925_ID_LDO##_id, \ 183 .owner = THIS_MODULE, \ 184 .n_voltages = 64, \ 185 .min_uV = min * 1000, \ 186 .uV_step = step * 1000, \ 187 }, \ 188 .vol_reg = MAX8925_LDOVOUT##_id, \ 189 .enable_reg = MAX8925_LDOCTL##_id, \ 190 } 191 192 #ifdef CONFIG_OF 193 static struct of_regulator_match max8925_regulator_matches[] = { 194 { .name = "SDV1",}, 195 { .name = "SDV2",}, 196 { .name = "SDV3",}, 197 { .name = "LDO1",}, 198 { .name = "LDO2",}, 199 { .name = "LDO3",}, 200 { .name = "LDO4",}, 201 { .name = "LDO5",}, 202 { .name = "LDO6",}, 203 { .name = "LDO7",}, 204 { .name = "LDO8",}, 205 { .name = "LDO9",}, 206 { .name = "LDO10",}, 207 { .name = "LDO11",}, 208 { .name = "LDO12",}, 209 { .name = "LDO13",}, 210 { .name = "LDO14",}, 211 { .name = "LDO15",}, 212 { .name = "LDO16",}, 213 { .name = "LDO17",}, 214 { .name = "LDO18",}, 215 { .name = "LDO19",}, 216 { .name = "LDO20",}, 217 }; 218 #endif 219 220 static struct max8925_regulator_info max8925_regulator_info[] = { 221 MAX8925_SDV(1, 637.5, 1425, 12.5), 222 MAX8925_SDV(2, 650, 2225, 25), 223 MAX8925_SDV(3, 750, 3900, 50), 224 225 MAX8925_LDO(1, 750, 3900, 50), 226 MAX8925_LDO(2, 650, 2250, 25), 227 MAX8925_LDO(3, 650, 2250, 25), 228 MAX8925_LDO(4, 750, 3900, 50), 229 MAX8925_LDO(5, 750, 3900, 50), 230 MAX8925_LDO(6, 750, 3900, 50), 231 MAX8925_LDO(7, 750, 3900, 50), 232 MAX8925_LDO(8, 750, 3900, 50), 233 MAX8925_LDO(9, 750, 3900, 50), 234 MAX8925_LDO(10, 750, 3900, 50), 235 MAX8925_LDO(11, 750, 3900, 50), 236 MAX8925_LDO(12, 750, 3900, 50), 237 MAX8925_LDO(13, 750, 3900, 50), 238 MAX8925_LDO(14, 750, 3900, 50), 239 MAX8925_LDO(15, 750, 3900, 50), 240 MAX8925_LDO(16, 750, 3900, 50), 241 MAX8925_LDO(17, 650, 2250, 25), 242 MAX8925_LDO(18, 650, 2250, 25), 243 MAX8925_LDO(19, 750, 3900, 50), 244 MAX8925_LDO(20, 750, 3900, 50), 245 }; 246 247 #ifdef CONFIG_OF 248 static int max8925_regulator_dt_init(struct platform_device *pdev, 249 struct regulator_config *config, 250 int ridx) 251 { 252 struct device_node *nproot, *np; 253 int rcount; 254 nproot = of_node_get(pdev->dev.parent->of_node); 255 if (!nproot) 256 return -ENODEV; 257 np = of_find_node_by_name(nproot, "regulators"); 258 if (!np) { 259 dev_err(&pdev->dev, "failed to find regulators node\n"); 260 return -ENODEV; 261 } 262 263 rcount = of_regulator_match(&pdev->dev, np, 264 &max8925_regulator_matches[ridx], 1); 265 of_node_put(np); 266 if (rcount < 0) 267 return -ENODEV; 268 config->init_data = max8925_regulator_matches[ridx].init_data; 269 config->of_node = max8925_regulator_matches[ridx].of_node; 270 271 return 0; 272 } 273 #else 274 #define max8925_regulator_dt_init(x, y, z) (-1) 275 #endif 276 277 static int max8925_regulator_probe(struct platform_device *pdev) 278 { 279 struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent); 280 struct regulator_init_data *pdata = dev_get_platdata(&pdev->dev); 281 struct regulator_config config = { }; 282 struct max8925_regulator_info *ri; 283 struct resource *res; 284 struct regulator_dev *rdev; 285 int i, regulator_idx; 286 287 res = platform_get_resource(pdev, IORESOURCE_REG, 0); 288 if (!res) { 289 dev_err(&pdev->dev, "No REG resource!\n"); 290 return -EINVAL; 291 } 292 for (i = 0; i < ARRAY_SIZE(max8925_regulator_info); i++) { 293 ri = &max8925_regulator_info[i]; 294 if (ri->vol_reg == res->start) { 295 regulator_idx = i; 296 break; 297 } 298 } 299 300 if (i == ARRAY_SIZE(max8925_regulator_info)) { 301 dev_err(&pdev->dev, "Failed to find regulator %llu\n", 302 (unsigned long long)res->start); 303 return -EINVAL; 304 } 305 ri->i2c = chip->i2c; 306 ri->chip = chip; 307 308 config.dev = &pdev->dev; 309 config.driver_data = ri; 310 311 if (max8925_regulator_dt_init(pdev, &config, regulator_idx)) 312 if (pdata) 313 config.init_data = pdata; 314 315 rdev = devm_regulator_register(&pdev->dev, &ri->desc, &config); 316 if (IS_ERR(rdev)) { 317 dev_err(&pdev->dev, "failed to register regulator %s\n", 318 ri->desc.name); 319 return PTR_ERR(rdev); 320 } 321 322 platform_set_drvdata(pdev, rdev); 323 return 0; 324 } 325 326 static struct platform_driver max8925_regulator_driver = { 327 .driver = { 328 .name = "max8925-regulator", 329 .owner = THIS_MODULE, 330 }, 331 .probe = max8925_regulator_probe, 332 }; 333 334 static int __init max8925_regulator_init(void) 335 { 336 return platform_driver_register(&max8925_regulator_driver); 337 } 338 subsys_initcall(max8925_regulator_init); 339 340 static void __exit max8925_regulator_exit(void) 341 { 342 platform_driver_unregister(&max8925_regulator_driver); 343 } 344 module_exit(max8925_regulator_exit); 345 346 MODULE_LICENSE("GPL"); 347 MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>"); 348 MODULE_DESCRIPTION("Regulator Driver for Maxim 8925 PMIC"); 349 MODULE_ALIAS("platform:max8925-regulator"); 350