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 23 struct 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 31 static u8 lp3971_reg_read(struct lp3971 *lp3971, u8 reg); 32 static 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 58 static 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 67 static 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 99 100 static const int ldo45_voltage_map[] = { 101 1000, 1050, 1100, 1150, 1200, 1250, 1300, 1350, 102 1400, 1500, 1800, 1900, 2500, 2800, 3000, 3300, 103 }; 104 105 static const int ldo123_voltage_map[] = { 106 1800, 1900, 2000, 2100, 2200, 2300, 2400, 2500, 107 2600, 2700, 2800, 2900, 3000, 3100, 3200, 3300, 108 }; 109 110 static 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 122 123 static 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 } 128 129 static 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 } 139 140 static 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 } 148 149 static 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 } 157 158 static 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 } 169 170 static 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 } 194 195 static 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 }; 203 204 static int lp3971_dcdc_list_voltage(struct regulator_dev *dev, unsigned index) 205 { 206 return 1000 * buck_voltage_map[index]; 207 } 208 209 static 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 } 219 220 static 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 } 228 229 static 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 } 237 238 static 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 } 257 258 static 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 } 295 296 static 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 }; 304 305 static 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 }; 371 372 static 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 || count != 1) 381 return -EIO; 382 383 *dest = ret; 384 return 0; 385 } 386 387 static int lp3971_i2c_write(struct i2c_client *i2c, char reg, int count, 388 const u16 *src) 389 { 390 int ret; 391 392 if (count != 1) 393 return -EIO; 394 ret = i2c_smbus_write_byte_data(i2c, reg, *src); 395 if (ret >= 0) 396 return 0; 397 398 return ret; 399 } 400 401 static u8 lp3971_reg_read(struct lp3971 *lp3971, u8 reg) 402 { 403 u16 val = 0; 404 405 mutex_lock(&lp3971->io_lock); 406 407 lp3971_i2c_read(lp3971->i2c, reg, 1, &val); 408 409 dev_dbg(lp3971->dev, "reg read 0x%02x -> 0x%02x\n", (int)reg, 410 (unsigned)val&0xff); 411 412 mutex_unlock(&lp3971->io_lock); 413 414 return val & 0xff; 415 } 416 417 static int lp3971_set_bits(struct lp3971 *lp3971, u8 reg, u16 mask, u16 val) 418 { 419 u16 tmp; 420 int ret; 421 422 mutex_lock(&lp3971->io_lock); 423 424 ret = lp3971_i2c_read(lp3971->i2c, reg, 1, &tmp); 425 tmp = (tmp & ~mask) | val; 426 if (ret == 0) { 427 ret = lp3971_i2c_write(lp3971->i2c, reg, 1, &tmp); 428 dev_dbg(lp3971->dev, "reg write 0x%02x -> 0x%02x\n", (int)reg, 429 (unsigned)val&0xff); 430 } 431 mutex_unlock(&lp3971->io_lock); 432 433 return ret; 434 } 435 436 static int __devinit setup_regulators(struct lp3971 *lp3971, 437 struct lp3971_platform_data *pdata) 438 { 439 int i, err; 440 441 lp3971->num_regulators = pdata->num_regulators; 442 lp3971->rdev = kcalloc(pdata->num_regulators, 443 sizeof(struct regulator_dev *), GFP_KERNEL); 444 if (!lp3971->rdev) { 445 err = -ENOMEM; 446 goto err_nomem; 447 } 448 449 /* Instantiate the regulators */ 450 for (i = 0; i < pdata->num_regulators; i++) { 451 struct lp3971_regulator_subdev *reg = &pdata->regulators[i]; 452 lp3971->rdev[i] = regulator_register(®ulators[reg->id], 453 lp3971->dev, reg->initdata, lp3971); 454 455 if (IS_ERR(lp3971->rdev[i])) { 456 err = PTR_ERR(lp3971->rdev[i]); 457 dev_err(lp3971->dev, "regulator init failed: %d\n", 458 err); 459 goto error; 460 } 461 } 462 463 return 0; 464 465 error: 466 while (--i >= 0) 467 regulator_unregister(lp3971->rdev[i]); 468 kfree(lp3971->rdev); 469 lp3971->rdev = NULL; 470 err_nomem: 471 return err; 472 } 473 474 static int __devinit lp3971_i2c_probe(struct i2c_client *i2c, 475 const struct i2c_device_id *id) 476 { 477 struct lp3971 *lp3971; 478 struct lp3971_platform_data *pdata = i2c->dev.platform_data; 479 int ret; 480 u16 val; 481 482 if (!pdata) { 483 dev_dbg(&i2c->dev, "No platform init data supplied\n"); 484 return -ENODEV; 485 } 486 487 lp3971 = kzalloc(sizeof(struct lp3971), GFP_KERNEL); 488 if (lp3971 == NULL) 489 return -ENOMEM; 490 491 lp3971->i2c = i2c; 492 lp3971->dev = &i2c->dev; 493 494 mutex_init(&lp3971->io_lock); 495 496 /* Detect LP3971 */ 497 ret = lp3971_i2c_read(i2c, LP3971_SYS_CONTROL1_REG, 1, &val); 498 if (ret == 0 && (val & SYS_CONTROL1_INIT_MASK) != SYS_CONTROL1_INIT_VAL) 499 ret = -ENODEV; 500 if (ret < 0) { 501 dev_err(&i2c->dev, "failed to detect device\n"); 502 goto err_detect; 503 } 504 505 ret = setup_regulators(lp3971, pdata); 506 if (ret < 0) 507 goto err_detect; 508 509 i2c_set_clientdata(i2c, lp3971); 510 return 0; 511 512 err_detect: 513 kfree(lp3971); 514 return ret; 515 } 516 517 static int __devexit lp3971_i2c_remove(struct i2c_client *i2c) 518 { 519 struct lp3971 *lp3971 = i2c_get_clientdata(i2c); 520 int i; 521 522 for (i = 0; i < lp3971->num_regulators; i++) 523 regulator_unregister(lp3971->rdev[i]); 524 525 kfree(lp3971->rdev); 526 kfree(lp3971); 527 528 return 0; 529 } 530 531 static const struct i2c_device_id lp3971_i2c_id[] = { 532 { "lp3971", 0 }, 533 { } 534 }; 535 MODULE_DEVICE_TABLE(i2c, lp3971_i2c_id); 536 537 static struct i2c_driver lp3971_i2c_driver = { 538 .driver = { 539 .name = "LP3971", 540 .owner = THIS_MODULE, 541 }, 542 .probe = lp3971_i2c_probe, 543 .remove = __devexit_p(lp3971_i2c_remove), 544 .id_table = lp3971_i2c_id, 545 }; 546 547 static int __init lp3971_module_init(void) 548 { 549 int ret; 550 551 ret = i2c_add_driver(&lp3971_i2c_driver); 552 if (ret != 0) 553 pr_err("Failed to register I2C driver: %d\n", ret); 554 555 return ret; 556 } 557 module_init(lp3971_module_init); 558 559 static void __exit lp3971_module_exit(void) 560 { 561 i2c_del_driver(&lp3971_i2c_driver); 562 } 563 module_exit(lp3971_module_exit); 564 565 MODULE_LICENSE("GPL"); 566 MODULE_AUTHOR("Marek Szyprowski <m.szyprowski@samsung.com>"); 567 MODULE_DESCRIPTION("LP3971 PMIC driver"); 568