1/* 2 * Regulator driver for National Semiconductors LP3971 PMIC chip 3 * 4 * Copyright (C) 2009 Samsung Electronics 5 * Author: Marek Szyprowski <m.szyprowski@samsung.com> 6 * 7 * Based on wm8350.c 8 * 9 * This program is free software; you can redistribute it and/or modify 10 * it under the terms of the GNU General Public License version 2 as 11 * published by the Free Software Foundation. 12 * 13 */ 14 15#include <linux/bug.h> 16#include <linux/err.h> 17#include <linux/i2c.h> 18#include <linux/kernel.h> 19#include <linux/regulator/driver.h> 20#include <linux/regulator/lp3971.h> 21#include <linux/slab.h> 22 23struct lp3971 { 24 struct device *dev; 25 struct mutex io_lock; 26 struct i2c_client *i2c; 27 int num_regulators; 28 struct regulator_dev **rdev; 29}; 30 31static u8 lp3971_reg_read(struct lp3971 *lp3971, u8 reg); 32static int lp3971_set_bits(struct lp3971 *lp3971, u8 reg, u16 mask, u16 val); 33 34#define LP3971_SYS_CONTROL1_REG 0x07 35 36/* System control register 1 initial value, 37 bits 4 and 5 are EPROM programmable */ 38#define SYS_CONTROL1_INIT_VAL 0x40 39#define SYS_CONTROL1_INIT_MASK 0xCF 40 41#define LP3971_BUCK_VOL_ENABLE_REG 0x10 42#define LP3971_BUCK_VOL_CHANGE_REG 0x20 43 44/* Voltage control registers shift: 45 LP3971_BUCK1 -> 0 46 LP3971_BUCK2 -> 4 47 LP3971_BUCK3 -> 6 48*/ 49#define BUCK_VOL_CHANGE_SHIFT(x) (((!!x) << 2) | (x & ~0x01)) 50#define BUCK_VOL_CHANGE_FLAG_GO 0x01 51#define BUCK_VOL_CHANGE_FLAG_TARGET 0x02 52#define BUCK_VOL_CHANGE_FLAG_MASK 0x03 53 54#define LP3971_BUCK1_BASE 0x23 55#define LP3971_BUCK2_BASE 0x29 56#define LP3971_BUCK3_BASE 0x32 57 58static const int buck_base_addr[] = { 59 LP3971_BUCK1_BASE, 60 LP3971_BUCK2_BASE, 61 LP3971_BUCK3_BASE, 62}; 63 64#define LP3971_BUCK_TARGET_VOL1_REG(x) (buck_base_addr[x]) 65#define LP3971_BUCK_TARGET_VOL2_REG(x) (buck_base_addr[x]+1) 66 67static const int buck_voltage_map[] = { 68 0, 800, 850, 900, 950, 1000, 1050, 1100, 69 1150, 1200, 1250, 1300, 1350, 1400, 1450, 1500, 70 1550, 1600, 1650, 1700, 1800, 1900, 2500, 2800, 71 3000, 3300, 72}; 73 74#define BUCK_TARGET_VOL_MASK 0x3f 75#define BUCK_TARGET_VOL_MIN_IDX 0x01 76#define BUCK_TARGET_VOL_MAX_IDX 0x19 77 78#define LP3971_BUCK_RAMP_REG(x) (buck_base_addr[x]+2) 79 80#define LP3971_LDO_ENABLE_REG 0x12 81#define LP3971_LDO_VOL_CONTR_BASE 0x39 82 83/* Voltage control registers: 84 LP3971_LDO1 -> LP3971_LDO_VOL_CONTR_BASE + 0 85 LP3971_LDO2 -> LP3971_LDO_VOL_CONTR_BASE + 0 86 LP3971_LDO3 -> LP3971_LDO_VOL_CONTR_BASE + 1 87 LP3971_LDO4 -> LP3971_LDO_VOL_CONTR_BASE + 1 88 LP3971_LDO5 -> LP3971_LDO_VOL_CONTR_BASE + 2 89*/ 90#define LP3971_LDO_VOL_CONTR_REG(x) (LP3971_LDO_VOL_CONTR_BASE + (x >> 1)) 91 92/* Voltage control registers shift: 93 LP3971_LDO1 -> 0, LP3971_LDO2 -> 4 94 LP3971_LDO3 -> 0, LP3971_LDO4 -> 4 95 LP3971_LDO5 -> 0 96*/ 97#define LDO_VOL_CONTR_SHIFT(x) ((x & 1) << 2) 98#define LDO_VOL_CONTR_MASK 0x0f 99 100static const int ldo45_voltage_map[] = { 101 1000, 1050, 1100, 1150, 1200, 1250, 1300, 1350, 102 1400, 1500, 1800, 1900, 2500, 2800, 3000, 3300, 103}; 104 105static const int ldo123_voltage_map[] = { 106 1800, 1900, 2000, 2100, 2200, 2300, 2400, 2500, 107 2600, 2700, 2800, 2900, 3000, 3100, 3200, 3300, 108}; 109 110static const int *ldo_voltage_map[] = { 111 ldo123_voltage_map, /* LDO1 */ 112 ldo123_voltage_map, /* LDO2 */ 113 ldo123_voltage_map, /* LDO3 */ 114 ldo45_voltage_map, /* LDO4 */ 115 ldo45_voltage_map, /* LDO5 */ 116}; 117 118#define LDO_VOL_VALUE_MAP(x) (ldo_voltage_map[(x - LP3971_LDO1)]) 119 120#define LDO_VOL_MIN_IDX 0x00 121#define LDO_VOL_MAX_IDX 0x0f 122 123static int lp3971_ldo_list_voltage(struct regulator_dev *dev, unsigned index) 124{ 125 int ldo = rdev_get_id(dev) - LP3971_LDO1; 126 return 1000 * LDO_VOL_VALUE_MAP(ldo)[index]; 127} 128 129static int lp3971_ldo_is_enabled(struct regulator_dev *dev) 130{ 131 struct lp3971 *lp3971 = rdev_get_drvdata(dev); 132 int ldo = rdev_get_id(dev) - LP3971_LDO1; 133 u16 mask = 1 << (1 + ldo); 134 u16 val; 135 136 val = lp3971_reg_read(lp3971, LP3971_LDO_ENABLE_REG); 137 return (val & mask) != 0; 138} 139 140static int lp3971_ldo_enable(struct regulator_dev *dev) 141{ 142 struct lp3971 *lp3971 = rdev_get_drvdata(dev); 143 int ldo = rdev_get_id(dev) - LP3971_LDO1; 144 u16 mask = 1 << (1 + ldo); 145 146 return lp3971_set_bits(lp3971, LP3971_LDO_ENABLE_REG, mask, mask); 147} 148 149static int lp3971_ldo_disable(struct regulator_dev *dev) 150{ 151 struct lp3971 *lp3971 = rdev_get_drvdata(dev); 152 int ldo = rdev_get_id(dev) - LP3971_LDO1; 153 u16 mask = 1 << (1 + ldo); 154 155 return lp3971_set_bits(lp3971, LP3971_LDO_ENABLE_REG, mask, 0); 156} 157 158static int lp3971_ldo_get_voltage(struct regulator_dev *dev) 159{ 160 struct lp3971 *lp3971 = rdev_get_drvdata(dev); 161 int ldo = rdev_get_id(dev) - LP3971_LDO1; 162 u16 val, reg; 163 164 reg = lp3971_reg_read(lp3971, LP3971_LDO_VOL_CONTR_REG(ldo)); 165 val = (reg >> LDO_VOL_CONTR_SHIFT(ldo)) & LDO_VOL_CONTR_MASK; 166 167 return 1000 * LDO_VOL_VALUE_MAP(ldo)[val]; 168} 169 170static int lp3971_ldo_set_voltage(struct regulator_dev *dev, 171 int min_uV, int max_uV) 172{ 173 struct lp3971 *lp3971 = rdev_get_drvdata(dev); 174 int ldo = rdev_get_id(dev) - LP3971_LDO1; 175 int min_vol = min_uV / 1000, max_vol = max_uV / 1000; 176 const int *vol_map = LDO_VOL_VALUE_MAP(ldo); 177 u16 val; 178 179 if (min_vol < vol_map[LDO_VOL_MIN_IDX] || 180 min_vol > vol_map[LDO_VOL_MAX_IDX]) 181 return -EINVAL; 182 183 for (val = LDO_VOL_MIN_IDX; val <= LDO_VOL_MAX_IDX; val++) 184 if (vol_map[val] >= min_vol) 185 break; 186 187 if (val > LDO_VOL_MAX_IDX || vol_map[val] > max_vol) 188 return -EINVAL; 189 190 return lp3971_set_bits(lp3971, LP3971_LDO_VOL_CONTR_REG(ldo), 191 LDO_VOL_CONTR_MASK << LDO_VOL_CONTR_SHIFT(ldo), 192 val << LDO_VOL_CONTR_SHIFT(ldo)); 193} 194 195static struct regulator_ops lp3971_ldo_ops = { 196 .list_voltage = lp3971_ldo_list_voltage, 197 .is_enabled = lp3971_ldo_is_enabled, 198 .enable = lp3971_ldo_enable, 199 .disable = lp3971_ldo_disable, 200 .get_voltage = lp3971_ldo_get_voltage, 201 .set_voltage = lp3971_ldo_set_voltage, 202}; 203 204static int lp3971_dcdc_list_voltage(struct regulator_dev *dev, unsigned index) 205{ 206 return 1000 * buck_voltage_map[index]; 207} 208 209static int lp3971_dcdc_is_enabled(struct regulator_dev *dev) 210{ 211 struct lp3971 *lp3971 = rdev_get_drvdata(dev); 212 int buck = rdev_get_id(dev) - LP3971_DCDC1; 213 u16 mask = 1 << (buck * 2); 214 u16 val; 215 216 val = lp3971_reg_read(lp3971, LP3971_BUCK_VOL_ENABLE_REG); 217 return (val & mask) != 0; 218} 219 220static int lp3971_dcdc_enable(struct regulator_dev *dev) 221{ 222 struct lp3971 *lp3971 = rdev_get_drvdata(dev); 223 int buck = rdev_get_id(dev) - LP3971_DCDC1; 224 u16 mask = 1 << (buck * 2); 225 226 return lp3971_set_bits(lp3971, LP3971_BUCK_VOL_ENABLE_REG, mask, mask); 227} 228 229static int lp3971_dcdc_disable(struct regulator_dev *dev) 230{ 231 struct lp3971 *lp3971 = rdev_get_drvdata(dev); 232 int buck = rdev_get_id(dev) - LP3971_DCDC1; 233 u16 mask = 1 << (buck * 2); 234 235 return lp3971_set_bits(lp3971, LP3971_BUCK_VOL_ENABLE_REG, mask, 0); 236} 237 238static int lp3971_dcdc_get_voltage(struct regulator_dev *dev) 239{ 240 struct lp3971 *lp3971 = rdev_get_drvdata(dev); 241 int buck = rdev_get_id(dev) - LP3971_DCDC1; 242 u16 reg; 243 int val; 244 245 reg = lp3971_reg_read(lp3971, LP3971_BUCK_TARGET_VOL1_REG(buck)); 246 reg &= BUCK_TARGET_VOL_MASK; 247 248 if (reg <= BUCK_TARGET_VOL_MAX_IDX) 249 val = 1000 * buck_voltage_map[reg]; 250 else { 251 val = 0; 252 dev_warn(&dev->dev, "chip reported incorrect voltage value.\n"); 253 } 254 255 return val; 256} 257 258static int lp3971_dcdc_set_voltage(struct regulator_dev *dev, 259 int min_uV, int max_uV) 260{ 261 struct lp3971 *lp3971 = rdev_get_drvdata(dev); 262 int buck = rdev_get_id(dev) - LP3971_DCDC1; 263 int min_vol = min_uV / 1000, max_vol = max_uV / 1000; 264 const int *vol_map = buck_voltage_map; 265 u16 val; 266 int ret; 267 268 if (min_vol < vol_map[BUCK_TARGET_VOL_MIN_IDX] || 269 min_vol > vol_map[BUCK_TARGET_VOL_MAX_IDX]) 270 return -EINVAL; 271 272 for (val = BUCK_TARGET_VOL_MIN_IDX; val <= BUCK_TARGET_VOL_MAX_IDX; 273 val++) 274 if (vol_map[val] >= min_vol) 275 break; 276 277 if (val > BUCK_TARGET_VOL_MAX_IDX || vol_map[val] > max_vol) 278 return -EINVAL; 279 280 ret = lp3971_set_bits(lp3971, LP3971_BUCK_TARGET_VOL1_REG(buck), 281 BUCK_TARGET_VOL_MASK, val); 282 if (ret) 283 return ret; 284 285 ret = lp3971_set_bits(lp3971, LP3971_BUCK_VOL_CHANGE_REG, 286 BUCK_VOL_CHANGE_FLAG_MASK << BUCK_VOL_CHANGE_SHIFT(buck), 287 BUCK_VOL_CHANGE_FLAG_GO << BUCK_VOL_CHANGE_SHIFT(buck)); 288 if (ret) 289 return ret; 290 291 return lp3971_set_bits(lp3971, LP3971_BUCK_VOL_CHANGE_REG, 292 BUCK_VOL_CHANGE_FLAG_MASK << BUCK_VOL_CHANGE_SHIFT(buck), 293 0 << BUCK_VOL_CHANGE_SHIFT(buck)); 294} 295 296static struct regulator_ops lp3971_dcdc_ops = { 297 .list_voltage = lp3971_dcdc_list_voltage, 298 .is_enabled = lp3971_dcdc_is_enabled, 299 .enable = lp3971_dcdc_enable, 300 .disable = lp3971_dcdc_disable, 301 .get_voltage = lp3971_dcdc_get_voltage, 302 .set_voltage = lp3971_dcdc_set_voltage, 303}; 304 305static struct regulator_desc regulators[] = { 306 { 307 .name = "LDO1", 308 .id = LP3971_LDO1, 309 .ops = &lp3971_ldo_ops, 310 .n_voltages = ARRAY_SIZE(ldo123_voltage_map), 311 .type = REGULATOR_VOLTAGE, 312 .owner = THIS_MODULE, 313 }, 314 { 315 .name = "LDO2", 316 .id = LP3971_LDO2, 317 .ops = &lp3971_ldo_ops, 318 .n_voltages = ARRAY_SIZE(ldo123_voltage_map), 319 .type = REGULATOR_VOLTAGE, 320 .owner = THIS_MODULE, 321 }, 322 { 323 .name = "LDO3", 324 .id = LP3971_LDO3, 325 .ops = &lp3971_ldo_ops, 326 .n_voltages = ARRAY_SIZE(ldo123_voltage_map), 327 .type = REGULATOR_VOLTAGE, 328 .owner = THIS_MODULE, 329 }, 330 { 331 .name = "LDO4", 332 .id = LP3971_LDO4, 333 .ops = &lp3971_ldo_ops, 334 .n_voltages = ARRAY_SIZE(ldo45_voltage_map), 335 .type = REGULATOR_VOLTAGE, 336 .owner = THIS_MODULE, 337 }, 338 { 339 .name = "LDO5", 340 .id = LP3971_LDO5, 341 .ops = &lp3971_ldo_ops, 342 .n_voltages = ARRAY_SIZE(ldo45_voltage_map), 343 .type = REGULATOR_VOLTAGE, 344 .owner = THIS_MODULE, 345 }, 346 { 347 .name = "DCDC1", 348 .id = LP3971_DCDC1, 349 .ops = &lp3971_dcdc_ops, 350 .n_voltages = ARRAY_SIZE(buck_voltage_map), 351 .type = REGULATOR_VOLTAGE, 352 .owner = THIS_MODULE, 353 }, 354 { 355 .name = "DCDC2", 356 .id = LP3971_DCDC2, 357 .ops = &lp3971_dcdc_ops, 358 .n_voltages = ARRAY_SIZE(buck_voltage_map), 359 .type = REGULATOR_VOLTAGE, 360 .owner = THIS_MODULE, 361 }, 362 { 363 .name = "DCDC3", 364 .id = LP3971_DCDC3, 365 .ops = &lp3971_dcdc_ops, 366 .n_voltages = ARRAY_SIZE(buck_voltage_map), 367 .type = REGULATOR_VOLTAGE, 368 .owner = THIS_MODULE, 369 }, 370}; 371 372static int lp3971_i2c_read(struct i2c_client *i2c, char reg, int count, 373 u16 *dest) 374{ 375 int ret; 376 377 if (count != 1) 378 return -EIO; 379 ret = i2c_smbus_read_byte_data(i2c, reg); 380 if (ret < 0) 381 return -EIO; 382 383 *dest = ret; 384 return 0; 385} 386 387static int lp3971_i2c_write(struct i2c_client *i2c, char reg, int count, 388 const u16 *src) 389{ 390 if (count != 1) 391 return -EIO; 392 return i2c_smbus_write_byte_data(i2c, reg, *src); 393} 394 395static u8 lp3971_reg_read(struct lp3971 *lp3971, u8 reg) 396{ 397 u16 val = 0; 398 399 mutex_lock(&lp3971->io_lock); 400 401 lp3971_i2c_read(lp3971->i2c, reg, 1, &val); 402 403 dev_dbg(lp3971->dev, "reg read 0x%02x -> 0x%02x\n", (int)reg, 404 (unsigned)val&0xff); 405 406 mutex_unlock(&lp3971->io_lock); 407 408 return val & 0xff; 409} 410 411static int lp3971_set_bits(struct lp3971 *lp3971, u8 reg, u16 mask, u16 val) 412{ 413 u16 tmp; 414 int ret; 415 416 mutex_lock(&lp3971->io_lock); 417 418 ret = lp3971_i2c_read(lp3971->i2c, reg, 1, &tmp); 419 tmp = (tmp & ~mask) | val; 420 if (ret == 0) { 421 ret = lp3971_i2c_write(lp3971->i2c, reg, 1, &tmp); 422 dev_dbg(lp3971->dev, "reg write 0x%02x -> 0x%02x\n", (int)reg, 423 (unsigned)val&0xff); 424 } 425 mutex_unlock(&lp3971->io_lock); 426 427 return ret; 428} 429 430static int __devinit setup_regulators(struct lp3971 *lp3971, 431 struct lp3971_platform_data *pdata) 432{ 433 int i, err; 434 435 lp3971->num_regulators = pdata->num_regulators; 436 lp3971->rdev = kcalloc(pdata->num_regulators, 437 sizeof(struct regulator_dev *), GFP_KERNEL); 438 if (!lp3971->rdev) { 439 err = -ENOMEM; 440 goto err_nomem; 441 } 442 443 /* Instantiate the regulators */ 444 for (i = 0; i < pdata->num_regulators; i++) { 445 struct lp3971_regulator_subdev *reg = &pdata->regulators[i]; 446 lp3971->rdev[i] = regulator_register(®ulators[reg->id], 447 lp3971->dev, reg->initdata, lp3971); 448 449 if (IS_ERR(lp3971->rdev[i])) { 450 err = PTR_ERR(lp3971->rdev[i]); 451 dev_err(lp3971->dev, "regulator init failed: %d\n", 452 err); 453 goto error; 454 } 455 } 456 457 return 0; 458 459error: 460 while (--i >= 0) 461 regulator_unregister(lp3971->rdev[i]); 462 kfree(lp3971->rdev); 463 lp3971->rdev = NULL; 464err_nomem: 465 return err; 466} 467 468static int __devinit lp3971_i2c_probe(struct i2c_client *i2c, 469 const struct i2c_device_id *id) 470{ 471 struct lp3971 *lp3971; 472 struct lp3971_platform_data *pdata = i2c->dev.platform_data; 473 int ret; 474 u16 val; 475 476 if (!pdata) { 477 dev_dbg(&i2c->dev, "No platform init data supplied\n"); 478 return -ENODEV; 479 } 480 481 lp3971 = kzalloc(sizeof(struct lp3971), GFP_KERNEL); 482 if (lp3971 == NULL) 483 return -ENOMEM; 484 485 lp3971->i2c = i2c; 486 lp3971->dev = &i2c->dev; 487 488 mutex_init(&lp3971->io_lock); 489 490 /* Detect LP3971 */ 491 ret = lp3971_i2c_read(i2c, LP3971_SYS_CONTROL1_REG, 1, &val); 492 if (ret == 0 && (val & SYS_CONTROL1_INIT_MASK) != SYS_CONTROL1_INIT_VAL) 493 ret = -ENODEV; 494 if (ret < 0) { 495 dev_err(&i2c->dev, "failed to detect device\n"); 496 goto err_detect; 497 } 498 499 ret = setup_regulators(lp3971, pdata); 500 if (ret < 0) 501 goto err_detect; 502 503 i2c_set_clientdata(i2c, lp3971); 504 return 0; 505 506err_detect: 507 kfree(lp3971); 508 return ret; 509} 510 511static int __devexit lp3971_i2c_remove(struct i2c_client *i2c) 512{ 513 struct lp3971 *lp3971 = i2c_get_clientdata(i2c); 514 int i; 515 516 for (i = 0; i < lp3971->num_regulators; i++) 517 regulator_unregister(lp3971->rdev[i]); 518 519 kfree(lp3971->rdev); 520 kfree(lp3971); 521 522 return 0; 523} 524 525static const struct i2c_device_id lp3971_i2c_id[] = { 526 { "lp3971", 0 }, 527 { } 528}; 529MODULE_DEVICE_TABLE(i2c, lp3971_i2c_id); 530 531static struct i2c_driver lp3971_i2c_driver = { 532 .driver = { 533 .name = "LP3971", 534 .owner = THIS_MODULE, 535 }, 536 .probe = lp3971_i2c_probe, 537 .remove = __devexit_p(lp3971_i2c_remove), 538 .id_table = lp3971_i2c_id, 539}; 540 541static int __init lp3971_module_init(void) 542{ 543 int ret; 544 545 ret = i2c_add_driver(&lp3971_i2c_driver); 546 if (ret != 0) 547 pr_err("Failed to register I2C driver: %d\n", ret); 548 549 return ret; 550} 551module_init(lp3971_module_init); 552 553static void __exit lp3971_module_exit(void) 554{ 555 i2c_del_driver(&lp3971_i2c_driver); 556} 557module_exit(lp3971_module_exit); 558 559MODULE_LICENSE("GPL"); 560MODULE_AUTHOR("Marek Szyprowski <m.szyprowski@samsung.com>"); 561MODULE_DESCRIPTION("LP3971 PMIC driver"); 562