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