1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Regulator driver for National Semiconductors LP3971 PMIC chip 4 * 5 * Copyright (C) 2009 Samsung Electronics 6 * Author: Marek Szyprowski <m.szyprowski@samsung.com> 7 * 8 * Based on wm8350.c 9 */ 10 11 #include <linux/bug.h> 12 #include <linux/err.h> 13 #include <linux/i2c.h> 14 #include <linux/kernel.h> 15 #include <linux/module.h> 16 #include <linux/regulator/driver.h> 17 #include <linux/regulator/lp3971.h> 18 #include <linux/slab.h> 19 20 struct lp3971 { 21 struct device *dev; 22 struct mutex io_lock; 23 struct i2c_client *i2c; 24 }; 25 26 static u8 lp3971_reg_read(struct lp3971 *lp3971, u8 reg); 27 static int lp3971_set_bits(struct lp3971 *lp3971, u8 reg, u16 mask, u16 val); 28 29 #define LP3971_SYS_CONTROL1_REG 0x07 30 31 /* System control register 1 initial value, 32 bits 4 and 5 are EPROM programmable */ 33 #define SYS_CONTROL1_INIT_VAL 0x40 34 #define SYS_CONTROL1_INIT_MASK 0xCF 35 36 #define LP3971_BUCK_VOL_ENABLE_REG 0x10 37 #define LP3971_BUCK_VOL_CHANGE_REG 0x20 38 39 /* Voltage control registers shift: 40 LP3971_BUCK1 -> 0 41 LP3971_BUCK2 -> 4 42 LP3971_BUCK3 -> 6 43 */ 44 #define BUCK_VOL_CHANGE_SHIFT(x) (((!!x) << 2) | (x & ~0x01)) 45 #define BUCK_VOL_CHANGE_FLAG_GO 0x01 46 #define BUCK_VOL_CHANGE_FLAG_TARGET 0x02 47 #define BUCK_VOL_CHANGE_FLAG_MASK 0x03 48 49 #define LP3971_BUCK1_BASE 0x23 50 #define LP3971_BUCK2_BASE 0x29 51 #define LP3971_BUCK3_BASE 0x32 52 53 static const int buck_base_addr[] = { 54 LP3971_BUCK1_BASE, 55 LP3971_BUCK2_BASE, 56 LP3971_BUCK3_BASE, 57 }; 58 59 #define LP3971_BUCK_TARGET_VOL1_REG(x) (buck_base_addr[x]) 60 #define LP3971_BUCK_TARGET_VOL2_REG(x) (buck_base_addr[x]+1) 61 62 static const unsigned int buck_voltage_map[] = { 63 0, 800000, 850000, 900000, 950000, 1000000, 1050000, 1100000, 64 1150000, 1200000, 1250000, 1300000, 1350000, 1400000, 1450000, 1500000, 65 1550000, 1600000, 1650000, 1700000, 1800000, 1900000, 2500000, 2800000, 66 3000000, 3300000, 67 }; 68 69 #define BUCK_TARGET_VOL_MASK 0x3f 70 71 #define LP3971_BUCK_RAMP_REG(x) (buck_base_addr[x]+2) 72 73 #define LP3971_LDO_ENABLE_REG 0x12 74 #define LP3971_LDO_VOL_CONTR_BASE 0x39 75 76 /* Voltage control registers: 77 LP3971_LDO1 -> LP3971_LDO_VOL_CONTR_BASE + 0 78 LP3971_LDO2 -> LP3971_LDO_VOL_CONTR_BASE + 0 79 LP3971_LDO3 -> LP3971_LDO_VOL_CONTR_BASE + 1 80 LP3971_LDO4 -> LP3971_LDO_VOL_CONTR_BASE + 1 81 LP3971_LDO5 -> LP3971_LDO_VOL_CONTR_BASE + 2 82 */ 83 #define LP3971_LDO_VOL_CONTR_REG(x) (LP3971_LDO_VOL_CONTR_BASE + (x >> 1)) 84 85 /* Voltage control registers shift: 86 LP3971_LDO1 -> 0, LP3971_LDO2 -> 4 87 LP3971_LDO3 -> 0, LP3971_LDO4 -> 4 88 LP3971_LDO5 -> 0 89 */ 90 #define LDO_VOL_CONTR_SHIFT(x) ((x & 1) << 2) 91 #define LDO_VOL_CONTR_MASK 0x0f 92 93 static const unsigned int ldo45_voltage_map[] = { 94 1000000, 1050000, 1100000, 1150000, 1200000, 1250000, 1300000, 1350000, 95 1400000, 1500000, 1800000, 1900000, 2500000, 2800000, 3000000, 3300000, 96 }; 97 98 static const unsigned int ldo123_voltage_map[] = { 99 1800000, 1900000, 2000000, 2100000, 2200000, 2300000, 2400000, 2500000, 100 2600000, 2700000, 2800000, 2900000, 3000000, 3100000, 3200000, 3300000, 101 }; 102 103 #define LDO_VOL_MIN_IDX 0x00 104 #define LDO_VOL_MAX_IDX 0x0f 105 106 static int lp3971_ldo_is_enabled(struct regulator_dev *dev) 107 { 108 struct lp3971 *lp3971 = rdev_get_drvdata(dev); 109 int ldo = rdev_get_id(dev) - LP3971_LDO1; 110 u16 mask = 1 << (1 + ldo); 111 u16 val; 112 113 val = lp3971_reg_read(lp3971, LP3971_LDO_ENABLE_REG); 114 return (val & mask) != 0; 115 } 116 117 static int lp3971_ldo_enable(struct regulator_dev *dev) 118 { 119 struct lp3971 *lp3971 = rdev_get_drvdata(dev); 120 int ldo = rdev_get_id(dev) - LP3971_LDO1; 121 u16 mask = 1 << (1 + ldo); 122 123 return lp3971_set_bits(lp3971, LP3971_LDO_ENABLE_REG, mask, mask); 124 } 125 126 static int lp3971_ldo_disable(struct regulator_dev *dev) 127 { 128 struct lp3971 *lp3971 = rdev_get_drvdata(dev); 129 int ldo = rdev_get_id(dev) - LP3971_LDO1; 130 u16 mask = 1 << (1 + ldo); 131 132 return lp3971_set_bits(lp3971, LP3971_LDO_ENABLE_REG, mask, 0); 133 } 134 135 static int lp3971_ldo_get_voltage_sel(struct regulator_dev *dev) 136 { 137 struct lp3971 *lp3971 = rdev_get_drvdata(dev); 138 int ldo = rdev_get_id(dev) - LP3971_LDO1; 139 u16 val, reg; 140 141 reg = lp3971_reg_read(lp3971, LP3971_LDO_VOL_CONTR_REG(ldo)); 142 val = (reg >> LDO_VOL_CONTR_SHIFT(ldo)) & LDO_VOL_CONTR_MASK; 143 144 return val; 145 } 146 147 static int lp3971_ldo_set_voltage_sel(struct regulator_dev *dev, 148 unsigned int selector) 149 { 150 struct lp3971 *lp3971 = rdev_get_drvdata(dev); 151 int ldo = rdev_get_id(dev) - LP3971_LDO1; 152 153 return lp3971_set_bits(lp3971, LP3971_LDO_VOL_CONTR_REG(ldo), 154 LDO_VOL_CONTR_MASK << LDO_VOL_CONTR_SHIFT(ldo), 155 selector << LDO_VOL_CONTR_SHIFT(ldo)); 156 } 157 158 static const struct regulator_ops lp3971_ldo_ops = { 159 .list_voltage = regulator_list_voltage_table, 160 .map_voltage = regulator_map_voltage_ascend, 161 .is_enabled = lp3971_ldo_is_enabled, 162 .enable = lp3971_ldo_enable, 163 .disable = lp3971_ldo_disable, 164 .get_voltage_sel = lp3971_ldo_get_voltage_sel, 165 .set_voltage_sel = lp3971_ldo_set_voltage_sel, 166 }; 167 168 static int lp3971_dcdc_is_enabled(struct regulator_dev *dev) 169 { 170 struct lp3971 *lp3971 = rdev_get_drvdata(dev); 171 int buck = rdev_get_id(dev) - LP3971_DCDC1; 172 u16 mask = 1 << (buck * 2); 173 u16 val; 174 175 val = lp3971_reg_read(lp3971, LP3971_BUCK_VOL_ENABLE_REG); 176 return (val & mask) != 0; 177 } 178 179 static int lp3971_dcdc_enable(struct regulator_dev *dev) 180 { 181 struct lp3971 *lp3971 = rdev_get_drvdata(dev); 182 int buck = rdev_get_id(dev) - LP3971_DCDC1; 183 u16 mask = 1 << (buck * 2); 184 185 return lp3971_set_bits(lp3971, LP3971_BUCK_VOL_ENABLE_REG, mask, mask); 186 } 187 188 static int lp3971_dcdc_disable(struct regulator_dev *dev) 189 { 190 struct lp3971 *lp3971 = rdev_get_drvdata(dev); 191 int buck = rdev_get_id(dev) - LP3971_DCDC1; 192 u16 mask = 1 << (buck * 2); 193 194 return lp3971_set_bits(lp3971, LP3971_BUCK_VOL_ENABLE_REG, mask, 0); 195 } 196 197 static int lp3971_dcdc_get_voltage_sel(struct regulator_dev *dev) 198 { 199 struct lp3971 *lp3971 = rdev_get_drvdata(dev); 200 int buck = rdev_get_id(dev) - LP3971_DCDC1; 201 u16 reg; 202 203 reg = lp3971_reg_read(lp3971, LP3971_BUCK_TARGET_VOL1_REG(buck)); 204 reg &= BUCK_TARGET_VOL_MASK; 205 206 return reg; 207 } 208 209 static int lp3971_dcdc_set_voltage_sel(struct regulator_dev *dev, 210 unsigned int selector) 211 { 212 struct lp3971 *lp3971 = rdev_get_drvdata(dev); 213 int buck = rdev_get_id(dev) - LP3971_DCDC1; 214 int ret; 215 216 ret = lp3971_set_bits(lp3971, LP3971_BUCK_TARGET_VOL1_REG(buck), 217 BUCK_TARGET_VOL_MASK, selector); 218 if (ret) 219 return ret; 220 221 ret = lp3971_set_bits(lp3971, LP3971_BUCK_VOL_CHANGE_REG, 222 BUCK_VOL_CHANGE_FLAG_MASK << BUCK_VOL_CHANGE_SHIFT(buck), 223 BUCK_VOL_CHANGE_FLAG_GO << BUCK_VOL_CHANGE_SHIFT(buck)); 224 if (ret) 225 return ret; 226 227 return lp3971_set_bits(lp3971, LP3971_BUCK_VOL_CHANGE_REG, 228 BUCK_VOL_CHANGE_FLAG_MASK << BUCK_VOL_CHANGE_SHIFT(buck), 229 0 << BUCK_VOL_CHANGE_SHIFT(buck)); 230 } 231 232 static const struct regulator_ops lp3971_dcdc_ops = { 233 .list_voltage = regulator_list_voltage_table, 234 .map_voltage = regulator_map_voltage_ascend, 235 .is_enabled = lp3971_dcdc_is_enabled, 236 .enable = lp3971_dcdc_enable, 237 .disable = lp3971_dcdc_disable, 238 .get_voltage_sel = lp3971_dcdc_get_voltage_sel, 239 .set_voltage_sel = lp3971_dcdc_set_voltage_sel, 240 }; 241 242 static const struct regulator_desc regulators[] = { 243 { 244 .name = "LDO1", 245 .id = LP3971_LDO1, 246 .ops = &lp3971_ldo_ops, 247 .n_voltages = ARRAY_SIZE(ldo123_voltage_map), 248 .volt_table = ldo123_voltage_map, 249 .type = REGULATOR_VOLTAGE, 250 .owner = THIS_MODULE, 251 }, 252 { 253 .name = "LDO2", 254 .id = LP3971_LDO2, 255 .ops = &lp3971_ldo_ops, 256 .n_voltages = ARRAY_SIZE(ldo123_voltage_map), 257 .volt_table = ldo123_voltage_map, 258 .type = REGULATOR_VOLTAGE, 259 .owner = THIS_MODULE, 260 }, 261 { 262 .name = "LDO3", 263 .id = LP3971_LDO3, 264 .ops = &lp3971_ldo_ops, 265 .n_voltages = ARRAY_SIZE(ldo123_voltage_map), 266 .volt_table = ldo123_voltage_map, 267 .type = REGULATOR_VOLTAGE, 268 .owner = THIS_MODULE, 269 }, 270 { 271 .name = "LDO4", 272 .id = LP3971_LDO4, 273 .ops = &lp3971_ldo_ops, 274 .n_voltages = ARRAY_SIZE(ldo45_voltage_map), 275 .volt_table = ldo45_voltage_map, 276 .type = REGULATOR_VOLTAGE, 277 .owner = THIS_MODULE, 278 }, 279 { 280 .name = "LDO5", 281 .id = LP3971_LDO5, 282 .ops = &lp3971_ldo_ops, 283 .n_voltages = ARRAY_SIZE(ldo45_voltage_map), 284 .volt_table = ldo45_voltage_map, 285 .type = REGULATOR_VOLTAGE, 286 .owner = THIS_MODULE, 287 }, 288 { 289 .name = "DCDC1", 290 .id = LP3971_DCDC1, 291 .ops = &lp3971_dcdc_ops, 292 .n_voltages = ARRAY_SIZE(buck_voltage_map), 293 .volt_table = buck_voltage_map, 294 .type = REGULATOR_VOLTAGE, 295 .owner = THIS_MODULE, 296 }, 297 { 298 .name = "DCDC2", 299 .id = LP3971_DCDC2, 300 .ops = &lp3971_dcdc_ops, 301 .n_voltages = ARRAY_SIZE(buck_voltage_map), 302 .volt_table = buck_voltage_map, 303 .type = REGULATOR_VOLTAGE, 304 .owner = THIS_MODULE, 305 }, 306 { 307 .name = "DCDC3", 308 .id = LP3971_DCDC3, 309 .ops = &lp3971_dcdc_ops, 310 .n_voltages = ARRAY_SIZE(buck_voltage_map), 311 .volt_table = buck_voltage_map, 312 .type = REGULATOR_VOLTAGE, 313 .owner = THIS_MODULE, 314 }, 315 }; 316 317 static int lp3971_i2c_read(struct i2c_client *i2c, char reg, int count, 318 u16 *dest) 319 { 320 int ret; 321 322 if (count != 1) 323 return -EIO; 324 ret = i2c_smbus_read_byte_data(i2c, reg); 325 if (ret < 0) 326 return ret; 327 328 *dest = ret; 329 return 0; 330 } 331 332 static int lp3971_i2c_write(struct i2c_client *i2c, char reg, int count, 333 const u16 *src) 334 { 335 if (count != 1) 336 return -EIO; 337 return i2c_smbus_write_byte_data(i2c, reg, *src); 338 } 339 340 static u8 lp3971_reg_read(struct lp3971 *lp3971, u8 reg) 341 { 342 u16 val = 0; 343 344 mutex_lock(&lp3971->io_lock); 345 346 lp3971_i2c_read(lp3971->i2c, reg, 1, &val); 347 348 dev_dbg(lp3971->dev, "reg read 0x%02x -> 0x%02x\n", (int)reg, 349 (unsigned)val&0xff); 350 351 mutex_unlock(&lp3971->io_lock); 352 353 return val & 0xff; 354 } 355 356 static int lp3971_set_bits(struct lp3971 *lp3971, u8 reg, u16 mask, u16 val) 357 { 358 u16 tmp; 359 int ret; 360 361 mutex_lock(&lp3971->io_lock); 362 363 ret = lp3971_i2c_read(lp3971->i2c, reg, 1, &tmp); 364 if (ret == 0) { 365 tmp = (tmp & ~mask) | val; 366 ret = lp3971_i2c_write(lp3971->i2c, reg, 1, &tmp); 367 dev_dbg(lp3971->dev, "reg write 0x%02x -> 0x%02x\n", (int)reg, 368 (unsigned)val&0xff); 369 } 370 mutex_unlock(&lp3971->io_lock); 371 372 return ret; 373 } 374 375 static int setup_regulators(struct lp3971 *lp3971, 376 struct lp3971_platform_data *pdata) 377 { 378 int i, err; 379 380 /* Instantiate the regulators */ 381 for (i = 0; i < pdata->num_regulators; i++) { 382 struct regulator_config config = { }; 383 struct lp3971_regulator_subdev *reg = &pdata->regulators[i]; 384 struct regulator_dev *rdev; 385 386 config.dev = lp3971->dev; 387 config.init_data = reg->initdata; 388 config.driver_data = lp3971; 389 390 rdev = devm_regulator_register(lp3971->dev, 391 ®ulators[reg->id], &config); 392 if (IS_ERR(rdev)) { 393 err = PTR_ERR(rdev); 394 dev_err(lp3971->dev, "regulator init failed: %d\n", 395 err); 396 return err; 397 } 398 } 399 400 return 0; 401 } 402 403 static int lp3971_i2c_probe(struct i2c_client *i2c) 404 { 405 struct lp3971 *lp3971; 406 struct lp3971_platform_data *pdata = dev_get_platdata(&i2c->dev); 407 int ret; 408 u16 val; 409 410 if (!pdata) { 411 dev_dbg(&i2c->dev, "No platform init data supplied\n"); 412 return -ENODEV; 413 } 414 415 lp3971 = devm_kzalloc(&i2c->dev, sizeof(struct lp3971), GFP_KERNEL); 416 if (lp3971 == NULL) 417 return -ENOMEM; 418 419 lp3971->i2c = i2c; 420 lp3971->dev = &i2c->dev; 421 422 mutex_init(&lp3971->io_lock); 423 424 /* Detect LP3971 */ 425 ret = lp3971_i2c_read(i2c, LP3971_SYS_CONTROL1_REG, 1, &val); 426 if (ret == 0 && (val & SYS_CONTROL1_INIT_MASK) != SYS_CONTROL1_INIT_VAL) 427 ret = -ENODEV; 428 if (ret < 0) { 429 dev_err(&i2c->dev, "failed to detect device\n"); 430 return ret; 431 } 432 433 ret = setup_regulators(lp3971, pdata); 434 if (ret < 0) 435 return ret; 436 437 i2c_set_clientdata(i2c, lp3971); 438 return 0; 439 } 440 441 static const struct i2c_device_id lp3971_i2c_id[] = { 442 { "lp3971", 0 }, 443 { } 444 }; 445 MODULE_DEVICE_TABLE(i2c, lp3971_i2c_id); 446 447 static struct i2c_driver lp3971_i2c_driver = { 448 .driver = { 449 .name = "LP3971", 450 .probe_type = PROBE_PREFER_ASYNCHRONOUS, 451 }, 452 .probe = lp3971_i2c_probe, 453 .id_table = lp3971_i2c_id, 454 }; 455 456 module_i2c_driver(lp3971_i2c_driver); 457 458 MODULE_LICENSE("GPL"); 459 MODULE_AUTHOR("Marek Szyprowski <m.szyprowski@samsung.com>"); 460 MODULE_DESCRIPTION("LP3971 PMIC driver"); 461