1// SPDX-License-Identifier: GPL-2.0+ 2// 3// max14577.c - mfd core driver for the Maxim 14577/77836 4// 5// Copyright (C) 2014 Samsung Electronics 6// Chanwoo Choi <cw00.choi@samsung.com> 7// Krzysztof Kozlowski <krzk@kernel.org> 8// 9// This driver is based on max8997.c 10 11#include <linux/err.h> 12#include <linux/module.h> 13#include <linux/interrupt.h> 14#include <linux/of_device.h> 15#include <linux/mfd/core.h> 16#include <linux/mfd/max14577.h> 17#include <linux/mfd/max14577-private.h> 18 19/* 20 * Table of valid charger currents for different Maxim chipsets. 21 * It is placed here because it is used by both charger and regulator driver. 22 */ 23const struct maxim_charger_current maxim_charger_currents[] = { 24 [MAXIM_DEVICE_TYPE_UNKNOWN] = { 0, 0, 0, 0 }, 25 [MAXIM_DEVICE_TYPE_MAX14577] = { 26 .min = MAX14577_CHARGER_CURRENT_LIMIT_MIN, 27 .high_start = MAX14577_CHARGER_CURRENT_LIMIT_HIGH_START, 28 .high_step = MAX14577_CHARGER_CURRENT_LIMIT_HIGH_STEP, 29 .max = MAX14577_CHARGER_CURRENT_LIMIT_MAX, 30 }, 31 [MAXIM_DEVICE_TYPE_MAX77836] = { 32 .min = MAX77836_CHARGER_CURRENT_LIMIT_MIN, 33 .high_start = MAX77836_CHARGER_CURRENT_LIMIT_HIGH_START, 34 .high_step = MAX77836_CHARGER_CURRENT_LIMIT_HIGH_STEP, 35 .max = MAX77836_CHARGER_CURRENT_LIMIT_MAX, 36 }, 37}; 38EXPORT_SYMBOL_GPL(maxim_charger_currents); 39 40/* 41 * maxim_charger_calc_reg_current - Calculate register value for current 42 * @limits: constraints for charger, matching the MBCICHWRC register 43 * @min_ua: minimal requested current, micro Amps 44 * @max_ua: maximum requested current, micro Amps 45 * @dst: destination to store calculated register value 46 * 47 * Calculates the value of MBCICHWRC (Fast Battery Charge Current) register 48 * for given current and stores it under pointed 'dst'. The stored value 49 * combines low bit (MBCICHWRCL) and high bits (MBCICHWRCH). It is also 50 * properly shifted. 51 * 52 * The calculated register value matches the current which: 53 * - is always between <limits.min, limits.max>; 54 * - is always less or equal to max_ua; 55 * - is the highest possible value; 56 * - may be lower than min_ua. 57 * 58 * On success returns 0. On error returns -EINVAL (requested min/max current 59 * is outside of given charger limits) and 'dst' is not set. 60 */ 61int maxim_charger_calc_reg_current(const struct maxim_charger_current *limits, 62 unsigned int min_ua, unsigned int max_ua, u8 *dst) 63{ 64 unsigned int current_bits; 65 66 if (min_ua > max_ua) 67 return -EINVAL; 68 69 if (min_ua > limits->max || max_ua < limits->min) 70 return -EINVAL; 71 72 if (max_ua < limits->high_start) { 73 /* 74 * Less than high_start, so set the minimal current 75 * (turn Low Bit off, 0 as high bits). 76 */ 77 *dst = 0x0; 78 return 0; 79 } 80 81 /* max_ua is in range: <high_start, infinite>, cut it to limits.max */ 82 max_ua = min(limits->max, max_ua); 83 max_ua -= limits->high_start; 84 /* 85 * There is no risk of overflow 'max_ua' here because: 86 * - max_ua >= limits.high_start 87 * - BUILD_BUG checks that 'limits' are: max >= high_start + high_step 88 */ 89 current_bits = max_ua / limits->high_step; 90 91 /* Turn Low Bit on (use range <limits.high_start, limits.max>) ... */ 92 *dst = 0x1 << CHGCTRL4_MBCICHWRCL_SHIFT; 93 /* and set proper High Bits */ 94 *dst |= current_bits << CHGCTRL4_MBCICHWRCH_SHIFT; 95 96 return 0; 97} 98EXPORT_SYMBOL_GPL(maxim_charger_calc_reg_current); 99 100static const struct mfd_cell max14577_devs[] = { 101 { 102 .name = "max14577-muic", 103 .of_compatible = "maxim,max14577-muic", 104 }, 105 { 106 .name = "max14577-regulator", 107 .of_compatible = "maxim,max14577-regulator", 108 }, 109 { 110 .name = "max14577-charger", 111 .of_compatible = "maxim,max14577-charger", 112 }, 113}; 114 115static const struct mfd_cell max77836_devs[] = { 116 { 117 .name = "max77836-muic", 118 .of_compatible = "maxim,max77836-muic", 119 }, 120 { 121 .name = "max77836-regulator", 122 .of_compatible = "maxim,max77836-regulator", 123 }, 124 { 125 .name = "max77836-charger", 126 .of_compatible = "maxim,max77836-charger", 127 }, 128 { 129 .name = "max77836-battery", 130 .of_compatible = "maxim,max77836-battery", 131 }, 132}; 133 134static const struct of_device_id max14577_dt_match[] = { 135 { 136 .compatible = "maxim,max14577", 137 .data = (void *)MAXIM_DEVICE_TYPE_MAX14577, 138 }, 139 { 140 .compatible = "maxim,max77836", 141 .data = (void *)MAXIM_DEVICE_TYPE_MAX77836, 142 }, 143 {}, 144}; 145 146static bool max14577_muic_volatile_reg(struct device *dev, unsigned int reg) 147{ 148 switch (reg) { 149 case MAX14577_REG_INT1 ... MAX14577_REG_STATUS3: 150 return true; 151 default: 152 break; 153 } 154 return false; 155} 156 157static bool max77836_muic_volatile_reg(struct device *dev, unsigned int reg) 158{ 159 /* Any max14577 volatile registers are also max77836 volatile. */ 160 if (max14577_muic_volatile_reg(dev, reg)) 161 return true; 162 163 switch (reg) { 164 case MAX77836_FG_REG_VCELL_MSB ... MAX77836_FG_REG_SOC_LSB: 165 case MAX77836_FG_REG_CRATE_MSB ... MAX77836_FG_REG_CRATE_LSB: 166 case MAX77836_FG_REG_STATUS_H ... MAX77836_FG_REG_STATUS_L: 167 case MAX77836_PMIC_REG_INTSRC: 168 case MAX77836_PMIC_REG_TOPSYS_INT: 169 case MAX77836_PMIC_REG_TOPSYS_STAT: 170 return true; 171 default: 172 break; 173 } 174 return false; 175} 176 177static const struct regmap_config max14577_muic_regmap_config = { 178 .reg_bits = 8, 179 .val_bits = 8, 180 .volatile_reg = max14577_muic_volatile_reg, 181 .max_register = MAX14577_REG_END, 182}; 183 184static const struct regmap_config max77836_pmic_regmap_config = { 185 .reg_bits = 8, 186 .val_bits = 8, 187 .volatile_reg = max77836_muic_volatile_reg, 188 .max_register = MAX77836_PMIC_REG_END, 189}; 190 191static const struct regmap_irq max14577_irqs[] = { 192 /* INT1 interrupts */ 193 { .reg_offset = 0, .mask = MAX14577_INT1_ADC_MASK, }, 194 { .reg_offset = 0, .mask = MAX14577_INT1_ADCLOW_MASK, }, 195 { .reg_offset = 0, .mask = MAX14577_INT1_ADCERR_MASK, }, 196 /* INT2 interrupts */ 197 { .reg_offset = 1, .mask = MAX14577_INT2_CHGTYP_MASK, }, 198 { .reg_offset = 1, .mask = MAX14577_INT2_CHGDETRUN_MASK, }, 199 { .reg_offset = 1, .mask = MAX14577_INT2_DCDTMR_MASK, }, 200 { .reg_offset = 1, .mask = MAX14577_INT2_DBCHG_MASK, }, 201 { .reg_offset = 1, .mask = MAX14577_INT2_VBVOLT_MASK, }, 202 /* INT3 interrupts */ 203 { .reg_offset = 2, .mask = MAX14577_INT3_EOC_MASK, }, 204 { .reg_offset = 2, .mask = MAX14577_INT3_CGMBC_MASK, }, 205 { .reg_offset = 2, .mask = MAX14577_INT3_OVP_MASK, }, 206 { .reg_offset = 2, .mask = MAX14577_INT3_MBCCHGERR_MASK, }, 207}; 208 209static const struct regmap_irq_chip max14577_irq_chip = { 210 .name = "max14577", 211 .status_base = MAX14577_REG_INT1, 212 .unmask_base = MAX14577_REG_INTMASK1, 213 .num_regs = 3, 214 .irqs = max14577_irqs, 215 .num_irqs = ARRAY_SIZE(max14577_irqs), 216}; 217 218static const struct regmap_irq max77836_muic_irqs[] = { 219 /* INT1 interrupts */ 220 { .reg_offset = 0, .mask = MAX14577_INT1_ADC_MASK, }, 221 { .reg_offset = 0, .mask = MAX14577_INT1_ADCLOW_MASK, }, 222 { .reg_offset = 0, .mask = MAX14577_INT1_ADCERR_MASK, }, 223 { .reg_offset = 0, .mask = MAX77836_INT1_ADC1K_MASK, }, 224 /* INT2 interrupts */ 225 { .reg_offset = 1, .mask = MAX14577_INT2_CHGTYP_MASK, }, 226 { .reg_offset = 1, .mask = MAX14577_INT2_CHGDETRUN_MASK, }, 227 { .reg_offset = 1, .mask = MAX14577_INT2_DCDTMR_MASK, }, 228 { .reg_offset = 1, .mask = MAX14577_INT2_DBCHG_MASK, }, 229 { .reg_offset = 1, .mask = MAX14577_INT2_VBVOLT_MASK, }, 230 { .reg_offset = 1, .mask = MAX77836_INT2_VIDRM_MASK, }, 231 /* INT3 interrupts */ 232 { .reg_offset = 2, .mask = MAX14577_INT3_EOC_MASK, }, 233 { .reg_offset = 2, .mask = MAX14577_INT3_CGMBC_MASK, }, 234 { .reg_offset = 2, .mask = MAX14577_INT3_OVP_MASK, }, 235 { .reg_offset = 2, .mask = MAX14577_INT3_MBCCHGERR_MASK, }, 236}; 237 238static const struct regmap_irq_chip max77836_muic_irq_chip = { 239 .name = "max77836-muic", 240 .status_base = MAX14577_REG_INT1, 241 .unmask_base = MAX14577_REG_INTMASK1, 242 .num_regs = 3, 243 .irqs = max77836_muic_irqs, 244 .num_irqs = ARRAY_SIZE(max77836_muic_irqs), 245}; 246 247static const struct regmap_irq max77836_pmic_irqs[] = { 248 { .reg_offset = 0, .mask = MAX77836_TOPSYS_INT_T120C_MASK, }, 249 { .reg_offset = 0, .mask = MAX77836_TOPSYS_INT_T140C_MASK, }, 250}; 251 252static const struct regmap_irq_chip max77836_pmic_irq_chip = { 253 .name = "max77836-pmic", 254 .status_base = MAX77836_PMIC_REG_TOPSYS_INT, 255 .mask_base = MAX77836_PMIC_REG_TOPSYS_INT_MASK, 256 .num_regs = 1, 257 .irqs = max77836_pmic_irqs, 258 .num_irqs = ARRAY_SIZE(max77836_pmic_irqs), 259}; 260 261static void max14577_print_dev_type(struct max14577 *max14577) 262{ 263 u8 reg_data, vendor_id, device_id; 264 int ret; 265 266 ret = max14577_read_reg(max14577->regmap, MAX14577_REG_DEVICEID, 267 ®_data); 268 if (ret) { 269 dev_err(max14577->dev, 270 "Failed to read DEVICEID register: %d\n", ret); 271 return; 272 } 273 274 vendor_id = ((reg_data & DEVID_VENDORID_MASK) >> 275 DEVID_VENDORID_SHIFT); 276 device_id = ((reg_data & DEVID_DEVICEID_MASK) >> 277 DEVID_DEVICEID_SHIFT); 278 279 dev_info(max14577->dev, "Device type: %u (ID: 0x%x, vendor: 0x%x)\n", 280 max14577->dev_type, device_id, vendor_id); 281} 282 283/* 284 * Max77836 specific initialization code for driver probe. 285 * Adds new I2C dummy device, regmap and regmap IRQ chip. 286 * Unmasks Interrupt Source register. 287 * 288 * On success returns 0. 289 * On failure returns errno and reverts any changes done so far (e.g. remove 290 * I2C dummy device), except masking the INT SRC register. 291 */ 292static int max77836_init(struct max14577 *max14577) 293{ 294 int ret; 295 u8 intsrc_mask; 296 297 max14577->i2c_pmic = i2c_new_dummy_device(max14577->i2c->adapter, 298 I2C_ADDR_PMIC); 299 if (IS_ERR(max14577->i2c_pmic)) { 300 dev_err(max14577->dev, "Failed to register PMIC I2C device\n"); 301 return PTR_ERR(max14577->i2c_pmic); 302 } 303 i2c_set_clientdata(max14577->i2c_pmic, max14577); 304 305 max14577->regmap_pmic = devm_regmap_init_i2c(max14577->i2c_pmic, 306 &max77836_pmic_regmap_config); 307 if (IS_ERR(max14577->regmap_pmic)) { 308 ret = PTR_ERR(max14577->regmap_pmic); 309 dev_err(max14577->dev, "Failed to allocate PMIC register map: %d\n", 310 ret); 311 goto err; 312 } 313 314 /* Un-mask MAX77836 Interrupt Source register */ 315 ret = max14577_read_reg(max14577->regmap_pmic, 316 MAX77836_PMIC_REG_INTSRC_MASK, &intsrc_mask); 317 if (ret < 0) { 318 dev_err(max14577->dev, "Failed to read PMIC register\n"); 319 goto err; 320 } 321 322 intsrc_mask &= ~(MAX77836_INTSRC_MASK_TOP_INT_MASK); 323 intsrc_mask &= ~(MAX77836_INTSRC_MASK_MUIC_CHG_INT_MASK); 324 ret = max14577_write_reg(max14577->regmap_pmic, 325 MAX77836_PMIC_REG_INTSRC_MASK, intsrc_mask); 326 if (ret < 0) { 327 dev_err(max14577->dev, "Failed to write PMIC register\n"); 328 goto err; 329 } 330 331 ret = regmap_add_irq_chip(max14577->regmap_pmic, max14577->irq, 332 IRQF_ONESHOT | IRQF_SHARED, 333 0, &max77836_pmic_irq_chip, 334 &max14577->irq_data_pmic); 335 if (ret != 0) { 336 dev_err(max14577->dev, "Failed to request PMIC IRQ %d: %d\n", 337 max14577->irq, ret); 338 goto err; 339 } 340 341 return 0; 342 343err: 344 i2c_unregister_device(max14577->i2c_pmic); 345 346 return ret; 347} 348 349/* 350 * Max77836 specific de-initialization code for driver remove. 351 */ 352static void max77836_remove(struct max14577 *max14577) 353{ 354 regmap_del_irq_chip(max14577->irq, max14577->irq_data_pmic); 355 i2c_unregister_device(max14577->i2c_pmic); 356} 357 358static int max14577_i2c_probe(struct i2c_client *i2c) 359{ 360 const struct i2c_device_id *id = i2c_client_get_device_id(i2c); 361 struct max14577 *max14577; 362 struct max14577_platform_data *pdata = dev_get_platdata(&i2c->dev); 363 struct device_node *np = i2c->dev.of_node; 364 int ret = 0; 365 const struct regmap_irq_chip *irq_chip; 366 const struct mfd_cell *mfd_devs; 367 unsigned int mfd_devs_size; 368 int irq_flags; 369 370 if (np) { 371 pdata = devm_kzalloc(&i2c->dev, sizeof(*pdata), GFP_KERNEL); 372 if (!pdata) 373 return -ENOMEM; 374 i2c->dev.platform_data = pdata; 375 } 376 377 if (!pdata) { 378 dev_err(&i2c->dev, "No platform data found.\n"); 379 return -EINVAL; 380 } 381 382 max14577 = devm_kzalloc(&i2c->dev, sizeof(*max14577), GFP_KERNEL); 383 if (!max14577) 384 return -ENOMEM; 385 386 i2c_set_clientdata(i2c, max14577); 387 max14577->dev = &i2c->dev; 388 max14577->i2c = i2c; 389 max14577->irq = i2c->irq; 390 391 max14577->regmap = devm_regmap_init_i2c(i2c, 392 &max14577_muic_regmap_config); 393 if (IS_ERR(max14577->regmap)) { 394 ret = PTR_ERR(max14577->regmap); 395 dev_err(max14577->dev, "Failed to allocate register map: %d\n", 396 ret); 397 return ret; 398 } 399 400 if (np) { 401 const struct of_device_id *of_id; 402 403 of_id = of_match_device(max14577_dt_match, &i2c->dev); 404 if (of_id) 405 max14577->dev_type = (uintptr_t)of_id->data; 406 } else { 407 max14577->dev_type = id->driver_data; 408 } 409 410 max14577_print_dev_type(max14577); 411 412 switch (max14577->dev_type) { 413 case MAXIM_DEVICE_TYPE_MAX77836: 414 irq_chip = &max77836_muic_irq_chip; 415 mfd_devs = max77836_devs; 416 mfd_devs_size = ARRAY_SIZE(max77836_devs); 417 irq_flags = IRQF_ONESHOT | IRQF_SHARED; 418 break; 419 case MAXIM_DEVICE_TYPE_MAX14577: 420 default: 421 irq_chip = &max14577_irq_chip; 422 mfd_devs = max14577_devs; 423 mfd_devs_size = ARRAY_SIZE(max14577_devs); 424 irq_flags = IRQF_ONESHOT; 425 break; 426 } 427 428 ret = regmap_add_irq_chip(max14577->regmap, max14577->irq, 429 irq_flags, 0, irq_chip, 430 &max14577->irq_data); 431 if (ret != 0) { 432 dev_err(&i2c->dev, "Failed to request IRQ %d: %d\n", 433 max14577->irq, ret); 434 return ret; 435 } 436 437 /* Max77836 specific initialization code (additional regmap) */ 438 if (max14577->dev_type == MAXIM_DEVICE_TYPE_MAX77836) { 439 ret = max77836_init(max14577); 440 if (ret < 0) 441 goto err_max77836; 442 } 443 444 ret = mfd_add_devices(max14577->dev, -1, mfd_devs, 445 mfd_devs_size, NULL, 0, NULL); 446 if (ret < 0) 447 goto err_mfd; 448 449 device_init_wakeup(max14577->dev, 1); 450 451 return 0; 452 453err_mfd: 454 if (max14577->dev_type == MAXIM_DEVICE_TYPE_MAX77836) 455 max77836_remove(max14577); 456err_max77836: 457 regmap_del_irq_chip(max14577->irq, max14577->irq_data); 458 459 return ret; 460} 461 462static void max14577_i2c_remove(struct i2c_client *i2c) 463{ 464 struct max14577 *max14577 = i2c_get_clientdata(i2c); 465 466 mfd_remove_devices(max14577->dev); 467 regmap_del_irq_chip(max14577->irq, max14577->irq_data); 468 if (max14577->dev_type == MAXIM_DEVICE_TYPE_MAX77836) 469 max77836_remove(max14577); 470} 471 472static const struct i2c_device_id max14577_i2c_id[] = { 473 { "max14577", MAXIM_DEVICE_TYPE_MAX14577, }, 474 { "max77836", MAXIM_DEVICE_TYPE_MAX77836, }, 475 { } 476}; 477MODULE_DEVICE_TABLE(i2c, max14577_i2c_id); 478 479static int max14577_suspend(struct device *dev) 480{ 481 struct i2c_client *i2c = to_i2c_client(dev); 482 struct max14577 *max14577 = i2c_get_clientdata(i2c); 483 484 if (device_may_wakeup(dev)) 485 enable_irq_wake(max14577->irq); 486 /* 487 * MUIC IRQ must be disabled during suspend because if it happens 488 * while suspended it will be handled before resuming I2C. 489 * 490 * When device is woken up from suspend (e.g. by ADC change), 491 * an interrupt occurs before resuming I2C bus controller. 492 * Interrupt handler tries to read registers but this read 493 * will fail because I2C is still suspended. 494 */ 495 disable_irq(max14577->irq); 496 497 return 0; 498} 499 500static int max14577_resume(struct device *dev) 501{ 502 struct i2c_client *i2c = to_i2c_client(dev); 503 struct max14577 *max14577 = i2c_get_clientdata(i2c); 504 505 if (device_may_wakeup(dev)) 506 disable_irq_wake(max14577->irq); 507 enable_irq(max14577->irq); 508 509 return 0; 510} 511 512static DEFINE_SIMPLE_DEV_PM_OPS(max14577_pm, max14577_suspend, max14577_resume); 513 514static struct i2c_driver max14577_i2c_driver = { 515 .driver = { 516 .name = "max14577", 517 .pm = pm_sleep_ptr(&max14577_pm), 518 .of_match_table = max14577_dt_match, 519 }, 520 .probe = max14577_i2c_probe, 521 .remove = max14577_i2c_remove, 522 .id_table = max14577_i2c_id, 523}; 524 525static int __init max14577_i2c_init(void) 526{ 527 BUILD_BUG_ON(ARRAY_SIZE(max14577_i2c_id) != MAXIM_DEVICE_TYPE_NUM); 528 BUILD_BUG_ON(ARRAY_SIZE(max14577_dt_match) != MAXIM_DEVICE_TYPE_NUM); 529 530 /* Valid charger current values must be provided for each chipset */ 531 BUILD_BUG_ON(ARRAY_SIZE(maxim_charger_currents) != MAXIM_DEVICE_TYPE_NUM); 532 533 /* Check for valid values for charger */ 534 BUILD_BUG_ON(MAX14577_CHARGER_CURRENT_LIMIT_HIGH_START + 535 MAX14577_CHARGER_CURRENT_LIMIT_HIGH_STEP * 0xf != 536 MAX14577_CHARGER_CURRENT_LIMIT_MAX); 537 BUILD_BUG_ON(MAX14577_CHARGER_CURRENT_LIMIT_HIGH_STEP == 0); 538 539 BUILD_BUG_ON(MAX77836_CHARGER_CURRENT_LIMIT_HIGH_START + 540 MAX77836_CHARGER_CURRENT_LIMIT_HIGH_STEP * 0xf != 541 MAX77836_CHARGER_CURRENT_LIMIT_MAX); 542 BUILD_BUG_ON(MAX77836_CHARGER_CURRENT_LIMIT_HIGH_STEP == 0); 543 544 return i2c_add_driver(&max14577_i2c_driver); 545} 546module_init(max14577_i2c_init); 547 548static void __exit max14577_i2c_exit(void) 549{ 550 i2c_del_driver(&max14577_i2c_driver); 551} 552module_exit(max14577_i2c_exit); 553 554MODULE_AUTHOR("Chanwoo Choi <cw00.choi@samsung.com>, Krzysztof Kozlowski <krzk@kernel.org>"); 555MODULE_DESCRIPTION("Maxim 14577/77836 multi-function core driver"); 556MODULE_LICENSE("GPL"); 557