1 /* 2 * max14577.c - mfd core driver for the Maxim 14577/77836 3 * 4 * Copyright (C) 2014 Samsung Electronics 5 * Chanwoo Choi <cw00.choi@samsung.com> 6 * Krzysztof Kozlowski <krzk@kernel.org> 7 * 8 * This program is free software; you can redistribute it and/or modify 9 * it under the terms of the GNU General Public License as published by 10 * the Free Software Foundation; either version 2 of the License, or 11 * (at your option) any later version. 12 * 13 * This program is distributed in the hope that it will be useful, 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 * GNU General Public License for more details. 17 * 18 * This driver is based on max8997.c 19 */ 20 21 #include <linux/err.h> 22 #include <linux/module.h> 23 #include <linux/interrupt.h> 24 #include <linux/of_device.h> 25 #include <linux/mfd/core.h> 26 #include <linux/mfd/max14577.h> 27 #include <linux/mfd/max14577-private.h> 28 29 /* 30 * Table of valid charger currents for different Maxim chipsets. 31 * It is placed here because it is used by both charger and regulator driver. 32 */ 33 const struct maxim_charger_current maxim_charger_currents[] = { 34 [MAXIM_DEVICE_TYPE_UNKNOWN] = { 0, 0, 0, 0 }, 35 [MAXIM_DEVICE_TYPE_MAX14577] = { 36 .min = MAX14577_CHARGER_CURRENT_LIMIT_MIN, 37 .high_start = MAX14577_CHARGER_CURRENT_LIMIT_HIGH_START, 38 .high_step = MAX14577_CHARGER_CURRENT_LIMIT_HIGH_STEP, 39 .max = MAX14577_CHARGER_CURRENT_LIMIT_MAX, 40 }, 41 [MAXIM_DEVICE_TYPE_MAX77836] = { 42 .min = MAX77836_CHARGER_CURRENT_LIMIT_MIN, 43 .high_start = MAX77836_CHARGER_CURRENT_LIMIT_HIGH_START, 44 .high_step = MAX77836_CHARGER_CURRENT_LIMIT_HIGH_STEP, 45 .max = MAX77836_CHARGER_CURRENT_LIMIT_MAX, 46 }, 47 }; 48 EXPORT_SYMBOL_GPL(maxim_charger_currents); 49 50 /* 51 * maxim_charger_calc_reg_current - Calculate register value for current 52 * @limits: constraints for charger, matching the MBCICHWRC register 53 * @min_ua: minimal requested current, micro Amps 54 * @max_ua: maximum requested current, micro Amps 55 * @dst: destination to store calculated register value 56 * 57 * Calculates the value of MBCICHWRC (Fast Battery Charge Current) register 58 * for given current and stores it under pointed 'dst'. The stored value 59 * combines low bit (MBCICHWRCL) and high bits (MBCICHWRCH). It is also 60 * properly shifted. 61 * 62 * The calculated register value matches the current which: 63 * - is always between <limits.min, limits.max>; 64 * - is always less or equal to max_ua; 65 * - is the highest possible value; 66 * - may be lower than min_ua. 67 * 68 * On success returns 0. On error returns -EINVAL (requested min/max current 69 * is outside of given charger limits) and 'dst' is not set. 70 */ 71 int maxim_charger_calc_reg_current(const struct maxim_charger_current *limits, 72 unsigned int min_ua, unsigned int max_ua, u8 *dst) 73 { 74 unsigned int current_bits = 0xf; 75 76 if (min_ua > max_ua) 77 return -EINVAL; 78 79 if (min_ua > limits->max || max_ua < limits->min) 80 return -EINVAL; 81 82 if (max_ua < limits->high_start) { 83 /* 84 * Less than high_start, so set the minimal current 85 * (turn Low Bit off, 0 as high bits). 86 */ 87 *dst = 0x0; 88 return 0; 89 } 90 91 /* max_ua is in range: <high_start, infinite>, cut it to limits.max */ 92 max_ua = min(limits->max, max_ua); 93 max_ua -= limits->high_start; 94 /* 95 * There is no risk of overflow 'max_ua' here because: 96 * - max_ua >= limits.high_start 97 * - BUILD_BUG checks that 'limits' are: max >= high_start + high_step 98 */ 99 current_bits = max_ua / limits->high_step; 100 101 /* Turn Low Bit on (use range <limits.high_start, limits.max>) ... */ 102 *dst = 0x1 << CHGCTRL4_MBCICHWRCL_SHIFT; 103 /* and set proper High Bits */ 104 *dst |= current_bits << CHGCTRL4_MBCICHWRCH_SHIFT; 105 106 return 0; 107 } 108 EXPORT_SYMBOL_GPL(maxim_charger_calc_reg_current); 109 110 static const struct mfd_cell max14577_devs[] = { 111 { 112 .name = "max14577-muic", 113 .of_compatible = "maxim,max14577-muic", 114 }, 115 { 116 .name = "max14577-regulator", 117 .of_compatible = "maxim,max14577-regulator", 118 }, 119 { 120 .name = "max14577-charger", 121 .of_compatible = "maxim,max14577-charger", 122 }, 123 }; 124 125 static const struct mfd_cell max77836_devs[] = { 126 { 127 .name = "max77836-muic", 128 .of_compatible = "maxim,max77836-muic", 129 }, 130 { 131 .name = "max77836-regulator", 132 .of_compatible = "maxim,max77836-regulator", 133 }, 134 { 135 .name = "max77836-charger", 136 .of_compatible = "maxim,max77836-charger", 137 }, 138 { 139 .name = "max77836-battery", 140 .of_compatible = "maxim,max77836-battery", 141 }, 142 }; 143 144 static const struct of_device_id max14577_dt_match[] = { 145 { 146 .compatible = "maxim,max14577", 147 .data = (void *)MAXIM_DEVICE_TYPE_MAX14577, 148 }, 149 { 150 .compatible = "maxim,max77836", 151 .data = (void *)MAXIM_DEVICE_TYPE_MAX77836, 152 }, 153 {}, 154 }; 155 156 static bool max14577_muic_volatile_reg(struct device *dev, unsigned int reg) 157 { 158 switch (reg) { 159 case MAX14577_REG_INT1 ... MAX14577_REG_STATUS3: 160 return true; 161 default: 162 break; 163 } 164 return false; 165 } 166 167 static bool max77836_muic_volatile_reg(struct device *dev, unsigned int reg) 168 { 169 /* Any max14577 volatile registers are also max77836 volatile. */ 170 if (max14577_muic_volatile_reg(dev, reg)) 171 return true; 172 173 switch (reg) { 174 case MAX77836_FG_REG_VCELL_MSB ... MAX77836_FG_REG_SOC_LSB: 175 case MAX77836_FG_REG_CRATE_MSB ... MAX77836_FG_REG_CRATE_LSB: 176 case MAX77836_FG_REG_STATUS_H ... MAX77836_FG_REG_STATUS_L: 177 case MAX77836_PMIC_REG_INTSRC: 178 case MAX77836_PMIC_REG_TOPSYS_INT: 179 case MAX77836_PMIC_REG_TOPSYS_STAT: 180 return true; 181 default: 182 break; 183 } 184 return false; 185 } 186 187 static const struct regmap_config max14577_muic_regmap_config = { 188 .reg_bits = 8, 189 .val_bits = 8, 190 .volatile_reg = max14577_muic_volatile_reg, 191 .max_register = MAX14577_REG_END, 192 }; 193 194 static const struct regmap_config max77836_pmic_regmap_config = { 195 .reg_bits = 8, 196 .val_bits = 8, 197 .volatile_reg = max77836_muic_volatile_reg, 198 .max_register = MAX77836_PMIC_REG_END, 199 }; 200 201 static const struct regmap_irq max14577_irqs[] = { 202 /* INT1 interrupts */ 203 { .reg_offset = 0, .mask = MAX14577_INT1_ADC_MASK, }, 204 { .reg_offset = 0, .mask = MAX14577_INT1_ADCLOW_MASK, }, 205 { .reg_offset = 0, .mask = MAX14577_INT1_ADCERR_MASK, }, 206 /* INT2 interrupts */ 207 { .reg_offset = 1, .mask = MAX14577_INT2_CHGTYP_MASK, }, 208 { .reg_offset = 1, .mask = MAX14577_INT2_CHGDETRUN_MASK, }, 209 { .reg_offset = 1, .mask = MAX14577_INT2_DCDTMR_MASK, }, 210 { .reg_offset = 1, .mask = MAX14577_INT2_DBCHG_MASK, }, 211 { .reg_offset = 1, .mask = MAX14577_INT2_VBVOLT_MASK, }, 212 /* INT3 interrupts */ 213 { .reg_offset = 2, .mask = MAX14577_INT3_EOC_MASK, }, 214 { .reg_offset = 2, .mask = MAX14577_INT3_CGMBC_MASK, }, 215 { .reg_offset = 2, .mask = MAX14577_INT3_OVP_MASK, }, 216 { .reg_offset = 2, .mask = MAX14577_INT3_MBCCHGERR_MASK, }, 217 }; 218 219 static const struct regmap_irq_chip max14577_irq_chip = { 220 .name = "max14577", 221 .status_base = MAX14577_REG_INT1, 222 .mask_base = MAX14577_REG_INTMASK1, 223 .mask_invert = true, 224 .num_regs = 3, 225 .irqs = max14577_irqs, 226 .num_irqs = ARRAY_SIZE(max14577_irqs), 227 }; 228 229 static const struct regmap_irq max77836_muic_irqs[] = { 230 /* INT1 interrupts */ 231 { .reg_offset = 0, .mask = MAX14577_INT1_ADC_MASK, }, 232 { .reg_offset = 0, .mask = MAX14577_INT1_ADCLOW_MASK, }, 233 { .reg_offset = 0, .mask = MAX14577_INT1_ADCERR_MASK, }, 234 { .reg_offset = 0, .mask = MAX77836_INT1_ADC1K_MASK, }, 235 /* INT2 interrupts */ 236 { .reg_offset = 1, .mask = MAX14577_INT2_CHGTYP_MASK, }, 237 { .reg_offset = 1, .mask = MAX14577_INT2_CHGDETRUN_MASK, }, 238 { .reg_offset = 1, .mask = MAX14577_INT2_DCDTMR_MASK, }, 239 { .reg_offset = 1, .mask = MAX14577_INT2_DBCHG_MASK, }, 240 { .reg_offset = 1, .mask = MAX14577_INT2_VBVOLT_MASK, }, 241 { .reg_offset = 1, .mask = MAX77836_INT2_VIDRM_MASK, }, 242 /* INT3 interrupts */ 243 { .reg_offset = 2, .mask = MAX14577_INT3_EOC_MASK, }, 244 { .reg_offset = 2, .mask = MAX14577_INT3_CGMBC_MASK, }, 245 { .reg_offset = 2, .mask = MAX14577_INT3_OVP_MASK, }, 246 { .reg_offset = 2, .mask = MAX14577_INT3_MBCCHGERR_MASK, }, 247 }; 248 249 static const struct regmap_irq_chip max77836_muic_irq_chip = { 250 .name = "max77836-muic", 251 .status_base = MAX14577_REG_INT1, 252 .mask_base = MAX14577_REG_INTMASK1, 253 .mask_invert = true, 254 .num_regs = 3, 255 .irqs = max77836_muic_irqs, 256 .num_irqs = ARRAY_SIZE(max77836_muic_irqs), 257 }; 258 259 static const struct regmap_irq max77836_pmic_irqs[] = { 260 { .reg_offset = 0, .mask = MAX77836_TOPSYS_INT_T120C_MASK, }, 261 { .reg_offset = 0, .mask = MAX77836_TOPSYS_INT_T140C_MASK, }, 262 }; 263 264 static const struct regmap_irq_chip max77836_pmic_irq_chip = { 265 .name = "max77836-pmic", 266 .status_base = MAX77836_PMIC_REG_TOPSYS_INT, 267 .mask_base = MAX77836_PMIC_REG_TOPSYS_INT_MASK, 268 .mask_invert = false, 269 .num_regs = 1, 270 .irqs = max77836_pmic_irqs, 271 .num_irqs = ARRAY_SIZE(max77836_pmic_irqs), 272 }; 273 274 static void max14577_print_dev_type(struct max14577 *max14577) 275 { 276 u8 reg_data, vendor_id, device_id; 277 int ret; 278 279 ret = max14577_read_reg(max14577->regmap, MAX14577_REG_DEVICEID, 280 ®_data); 281 if (ret) { 282 dev_err(max14577->dev, 283 "Failed to read DEVICEID register: %d\n", ret); 284 return; 285 } 286 287 vendor_id = ((reg_data & DEVID_VENDORID_MASK) >> 288 DEVID_VENDORID_SHIFT); 289 device_id = ((reg_data & DEVID_DEVICEID_MASK) >> 290 DEVID_DEVICEID_SHIFT); 291 292 dev_info(max14577->dev, "Device type: %u (ID: 0x%x, vendor: 0x%x)\n", 293 max14577->dev_type, device_id, vendor_id); 294 } 295 296 /* 297 * Max77836 specific initialization code for driver probe. 298 * Adds new I2C dummy device, regmap and regmap IRQ chip. 299 * Unmasks Interrupt Source register. 300 * 301 * On success returns 0. 302 * On failure returns errno and reverts any changes done so far (e.g. remove 303 * I2C dummy device), except masking the INT SRC register. 304 */ 305 static int max77836_init(struct max14577 *max14577) 306 { 307 int ret; 308 u8 intsrc_mask; 309 310 max14577->i2c_pmic = i2c_new_dummy(max14577->i2c->adapter, 311 I2C_ADDR_PMIC); 312 if (!max14577->i2c_pmic) { 313 dev_err(max14577->dev, "Failed to register PMIC I2C device\n"); 314 return -ENODEV; 315 } 316 i2c_set_clientdata(max14577->i2c_pmic, max14577); 317 318 max14577->regmap_pmic = devm_regmap_init_i2c(max14577->i2c_pmic, 319 &max77836_pmic_regmap_config); 320 if (IS_ERR(max14577->regmap_pmic)) { 321 ret = PTR_ERR(max14577->regmap_pmic); 322 dev_err(max14577->dev, "Failed to allocate PMIC register map: %d\n", 323 ret); 324 goto err; 325 } 326 327 /* Un-mask MAX77836 Interrupt Source register */ 328 ret = max14577_read_reg(max14577->regmap_pmic, 329 MAX77836_PMIC_REG_INTSRC_MASK, &intsrc_mask); 330 if (ret < 0) { 331 dev_err(max14577->dev, "Failed to read PMIC register\n"); 332 goto err; 333 } 334 335 intsrc_mask &= ~(MAX77836_INTSRC_MASK_TOP_INT_MASK); 336 intsrc_mask &= ~(MAX77836_INTSRC_MASK_MUIC_CHG_INT_MASK); 337 ret = max14577_write_reg(max14577->regmap_pmic, 338 MAX77836_PMIC_REG_INTSRC_MASK, intsrc_mask); 339 if (ret < 0) { 340 dev_err(max14577->dev, "Failed to write PMIC register\n"); 341 goto err; 342 } 343 344 ret = regmap_add_irq_chip(max14577->regmap_pmic, max14577->irq, 345 IRQF_TRIGGER_FALLING | IRQF_ONESHOT | IRQF_SHARED, 346 0, &max77836_pmic_irq_chip, 347 &max14577->irq_data_pmic); 348 if (ret != 0) { 349 dev_err(max14577->dev, "Failed to request PMIC IRQ %d: %d\n", 350 max14577->irq, ret); 351 goto err; 352 } 353 354 return 0; 355 356 err: 357 i2c_unregister_device(max14577->i2c_pmic); 358 359 return ret; 360 } 361 362 /* 363 * Max77836 specific de-initialization code for driver remove. 364 */ 365 static void max77836_remove(struct max14577 *max14577) 366 { 367 regmap_del_irq_chip(max14577->irq, max14577->irq_data_pmic); 368 i2c_unregister_device(max14577->i2c_pmic); 369 } 370 371 static int max14577_i2c_probe(struct i2c_client *i2c, 372 const struct i2c_device_id *id) 373 { 374 struct max14577 *max14577; 375 struct max14577_platform_data *pdata = dev_get_platdata(&i2c->dev); 376 struct device_node *np = i2c->dev.of_node; 377 int ret = 0; 378 const struct regmap_irq_chip *irq_chip; 379 const struct mfd_cell *mfd_devs; 380 unsigned int mfd_devs_size; 381 int irq_flags; 382 383 if (np) { 384 pdata = devm_kzalloc(&i2c->dev, sizeof(*pdata), GFP_KERNEL); 385 if (!pdata) 386 return -ENOMEM; 387 i2c->dev.platform_data = pdata; 388 } 389 390 if (!pdata) { 391 dev_err(&i2c->dev, "No platform data found.\n"); 392 return -EINVAL; 393 } 394 395 max14577 = devm_kzalloc(&i2c->dev, sizeof(*max14577), GFP_KERNEL); 396 if (!max14577) 397 return -ENOMEM; 398 399 i2c_set_clientdata(i2c, max14577); 400 max14577->dev = &i2c->dev; 401 max14577->i2c = i2c; 402 max14577->irq = i2c->irq; 403 404 max14577->regmap = devm_regmap_init_i2c(i2c, 405 &max14577_muic_regmap_config); 406 if (IS_ERR(max14577->regmap)) { 407 ret = PTR_ERR(max14577->regmap); 408 dev_err(max14577->dev, "Failed to allocate register map: %d\n", 409 ret); 410 return ret; 411 } 412 413 if (np) { 414 const struct of_device_id *of_id; 415 416 of_id = of_match_device(max14577_dt_match, &i2c->dev); 417 if (of_id) 418 max14577->dev_type = 419 (enum maxim_device_type)of_id->data; 420 } else { 421 max14577->dev_type = id->driver_data; 422 } 423 424 max14577_print_dev_type(max14577); 425 426 switch (max14577->dev_type) { 427 case MAXIM_DEVICE_TYPE_MAX77836: 428 irq_chip = &max77836_muic_irq_chip; 429 mfd_devs = max77836_devs; 430 mfd_devs_size = ARRAY_SIZE(max77836_devs); 431 irq_flags = IRQF_TRIGGER_FALLING | IRQF_ONESHOT | IRQF_SHARED; 432 break; 433 case MAXIM_DEVICE_TYPE_MAX14577: 434 default: 435 irq_chip = &max14577_irq_chip; 436 mfd_devs = max14577_devs; 437 mfd_devs_size = ARRAY_SIZE(max14577_devs); 438 irq_flags = IRQF_TRIGGER_FALLING | IRQF_ONESHOT; 439 break; 440 } 441 442 ret = regmap_add_irq_chip(max14577->regmap, max14577->irq, 443 irq_flags, 0, irq_chip, 444 &max14577->irq_data); 445 if (ret != 0) { 446 dev_err(&i2c->dev, "Failed to request IRQ %d: %d\n", 447 max14577->irq, ret); 448 return ret; 449 } 450 451 /* Max77836 specific initialization code (additional regmap) */ 452 if (max14577->dev_type == MAXIM_DEVICE_TYPE_MAX77836) { 453 ret = max77836_init(max14577); 454 if (ret < 0) 455 goto err_max77836; 456 } 457 458 ret = mfd_add_devices(max14577->dev, -1, mfd_devs, 459 mfd_devs_size, NULL, 0, NULL); 460 if (ret < 0) 461 goto err_mfd; 462 463 device_init_wakeup(max14577->dev, 1); 464 465 return 0; 466 467 err_mfd: 468 if (max14577->dev_type == MAXIM_DEVICE_TYPE_MAX77836) 469 max77836_remove(max14577); 470 err_max77836: 471 regmap_del_irq_chip(max14577->irq, max14577->irq_data); 472 473 return ret; 474 } 475 476 static int max14577_i2c_remove(struct i2c_client *i2c) 477 { 478 struct max14577 *max14577 = i2c_get_clientdata(i2c); 479 480 mfd_remove_devices(max14577->dev); 481 regmap_del_irq_chip(max14577->irq, max14577->irq_data); 482 if (max14577->dev_type == MAXIM_DEVICE_TYPE_MAX77836) 483 max77836_remove(max14577); 484 485 return 0; 486 } 487 488 static const struct i2c_device_id max14577_i2c_id[] = { 489 { "max14577", MAXIM_DEVICE_TYPE_MAX14577, }, 490 { "max77836", MAXIM_DEVICE_TYPE_MAX77836, }, 491 { } 492 }; 493 MODULE_DEVICE_TABLE(i2c, max14577_i2c_id); 494 495 #ifdef CONFIG_PM_SLEEP 496 static int max14577_suspend(struct device *dev) 497 { 498 struct i2c_client *i2c = to_i2c_client(dev); 499 struct max14577 *max14577 = i2c_get_clientdata(i2c); 500 501 if (device_may_wakeup(dev)) 502 enable_irq_wake(max14577->irq); 503 /* 504 * MUIC IRQ must be disabled during suspend because if it happens 505 * while suspended it will be handled before resuming I2C. 506 * 507 * When device is woken up from suspend (e.g. by ADC change), 508 * an interrupt occurs before resuming I2C bus controller. 509 * Interrupt handler tries to read registers but this read 510 * will fail because I2C is still suspended. 511 */ 512 disable_irq(max14577->irq); 513 514 return 0; 515 } 516 517 static int max14577_resume(struct device *dev) 518 { 519 struct i2c_client *i2c = to_i2c_client(dev); 520 struct max14577 *max14577 = i2c_get_clientdata(i2c); 521 522 if (device_may_wakeup(dev)) 523 disable_irq_wake(max14577->irq); 524 enable_irq(max14577->irq); 525 526 return 0; 527 } 528 #endif /* CONFIG_PM_SLEEP */ 529 530 static SIMPLE_DEV_PM_OPS(max14577_pm, max14577_suspend, max14577_resume); 531 532 static struct i2c_driver max14577_i2c_driver = { 533 .driver = { 534 .name = "max14577", 535 .pm = &max14577_pm, 536 .of_match_table = max14577_dt_match, 537 }, 538 .probe = max14577_i2c_probe, 539 .remove = max14577_i2c_remove, 540 .id_table = max14577_i2c_id, 541 }; 542 543 static int __init max14577_i2c_init(void) 544 { 545 BUILD_BUG_ON(ARRAY_SIZE(max14577_i2c_id) != MAXIM_DEVICE_TYPE_NUM); 546 BUILD_BUG_ON(ARRAY_SIZE(max14577_dt_match) != MAXIM_DEVICE_TYPE_NUM); 547 548 /* Valid charger current values must be provided for each chipset */ 549 BUILD_BUG_ON(ARRAY_SIZE(maxim_charger_currents) != MAXIM_DEVICE_TYPE_NUM); 550 551 /* Check for valid values for charger */ 552 BUILD_BUG_ON(MAX14577_CHARGER_CURRENT_LIMIT_HIGH_START + 553 MAX14577_CHARGER_CURRENT_LIMIT_HIGH_STEP * 0xf != 554 MAX14577_CHARGER_CURRENT_LIMIT_MAX); 555 BUILD_BUG_ON(MAX14577_CHARGER_CURRENT_LIMIT_HIGH_STEP == 0); 556 557 BUILD_BUG_ON(MAX77836_CHARGER_CURRENT_LIMIT_HIGH_START + 558 MAX77836_CHARGER_CURRENT_LIMIT_HIGH_STEP * 0xf != 559 MAX77836_CHARGER_CURRENT_LIMIT_MAX); 560 BUILD_BUG_ON(MAX77836_CHARGER_CURRENT_LIMIT_HIGH_STEP == 0); 561 562 return i2c_add_driver(&max14577_i2c_driver); 563 } 564 module_init(max14577_i2c_init); 565 566 static void __exit max14577_i2c_exit(void) 567 { 568 i2c_del_driver(&max14577_i2c_driver); 569 } 570 module_exit(max14577_i2c_exit); 571 572 MODULE_AUTHOR("Chanwoo Choi <cw00.choi@samsung.com>, Krzysztof Kozlowski <krzk@kernel.org>"); 573 MODULE_DESCRIPTION("Maxim 14577/77836 multi-function core driver"); 574 MODULE_LICENSE("GPL"); 575