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 */ 23 const 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 }; 38 EXPORT_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 */ 61 int 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 } 98 EXPORT_SYMBOL_GPL(maxim_charger_calc_reg_current); 99 100 static 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 }; 114 115 static 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 }; 133 134 static 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 }; 145 146 static 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 } 156 157 static 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 } 176 177 static 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 }; 183 184 static 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 }; 190 191 static 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 }; 208 209 static const struct regmap_irq_chip max14577_irq_chip = { 210 .name = "max14577", 211 .status_base = MAX14577_REG_INT1, 212 .mask_base = MAX14577_REG_INTMASK1, 213 .mask_invert = true, 214 .num_regs = 3, 215 .irqs = max14577_irqs, 216 .num_irqs = ARRAY_SIZE(max14577_irqs), 217 }; 218 219 static const struct regmap_irq max77836_muic_irqs[] = { 220 /* INT1 interrupts */ 221 { .reg_offset = 0, .mask = MAX14577_INT1_ADC_MASK, }, 222 { .reg_offset = 0, .mask = MAX14577_INT1_ADCLOW_MASK, }, 223 { .reg_offset = 0, .mask = MAX14577_INT1_ADCERR_MASK, }, 224 { .reg_offset = 0, .mask = MAX77836_INT1_ADC1K_MASK, }, 225 /* INT2 interrupts */ 226 { .reg_offset = 1, .mask = MAX14577_INT2_CHGTYP_MASK, }, 227 { .reg_offset = 1, .mask = MAX14577_INT2_CHGDETRUN_MASK, }, 228 { .reg_offset = 1, .mask = MAX14577_INT2_DCDTMR_MASK, }, 229 { .reg_offset = 1, .mask = MAX14577_INT2_DBCHG_MASK, }, 230 { .reg_offset = 1, .mask = MAX14577_INT2_VBVOLT_MASK, }, 231 { .reg_offset = 1, .mask = MAX77836_INT2_VIDRM_MASK, }, 232 /* INT3 interrupts */ 233 { .reg_offset = 2, .mask = MAX14577_INT3_EOC_MASK, }, 234 { .reg_offset = 2, .mask = MAX14577_INT3_CGMBC_MASK, }, 235 { .reg_offset = 2, .mask = MAX14577_INT3_OVP_MASK, }, 236 { .reg_offset = 2, .mask = MAX14577_INT3_MBCCHGERR_MASK, }, 237 }; 238 239 static const struct regmap_irq_chip max77836_muic_irq_chip = { 240 .name = "max77836-muic", 241 .status_base = MAX14577_REG_INT1, 242 .mask_base = MAX14577_REG_INTMASK1, 243 .mask_invert = true, 244 .num_regs = 3, 245 .irqs = max77836_muic_irqs, 246 .num_irqs = ARRAY_SIZE(max77836_muic_irqs), 247 }; 248 249 static const struct regmap_irq max77836_pmic_irqs[] = { 250 { .reg_offset = 0, .mask = MAX77836_TOPSYS_INT_T120C_MASK, }, 251 { .reg_offset = 0, .mask = MAX77836_TOPSYS_INT_T140C_MASK, }, 252 }; 253 254 static const struct regmap_irq_chip max77836_pmic_irq_chip = { 255 .name = "max77836-pmic", 256 .status_base = MAX77836_PMIC_REG_TOPSYS_INT, 257 .mask_base = MAX77836_PMIC_REG_TOPSYS_INT_MASK, 258 .mask_invert = false, 259 .num_regs = 1, 260 .irqs = max77836_pmic_irqs, 261 .num_irqs = ARRAY_SIZE(max77836_pmic_irqs), 262 }; 263 264 static void max14577_print_dev_type(struct max14577 *max14577) 265 { 266 u8 reg_data, vendor_id, device_id; 267 int ret; 268 269 ret = max14577_read_reg(max14577->regmap, MAX14577_REG_DEVICEID, 270 ®_data); 271 if (ret) { 272 dev_err(max14577->dev, 273 "Failed to read DEVICEID register: %d\n", ret); 274 return; 275 } 276 277 vendor_id = ((reg_data & DEVID_VENDORID_MASK) >> 278 DEVID_VENDORID_SHIFT); 279 device_id = ((reg_data & DEVID_DEVICEID_MASK) >> 280 DEVID_DEVICEID_SHIFT); 281 282 dev_info(max14577->dev, "Device type: %u (ID: 0x%x, vendor: 0x%x)\n", 283 max14577->dev_type, device_id, vendor_id); 284 } 285 286 /* 287 * Max77836 specific initialization code for driver probe. 288 * Adds new I2C dummy device, regmap and regmap IRQ chip. 289 * Unmasks Interrupt Source register. 290 * 291 * On success returns 0. 292 * On failure returns errno and reverts any changes done so far (e.g. remove 293 * I2C dummy device), except masking the INT SRC register. 294 */ 295 static int max77836_init(struct max14577 *max14577) 296 { 297 int ret; 298 u8 intsrc_mask; 299 300 max14577->i2c_pmic = i2c_new_dummy_device(max14577->i2c->adapter, 301 I2C_ADDR_PMIC); 302 if (IS_ERR(max14577->i2c_pmic)) { 303 dev_err(max14577->dev, "Failed to register PMIC I2C device\n"); 304 return PTR_ERR(max14577->i2c_pmic); 305 } 306 i2c_set_clientdata(max14577->i2c_pmic, max14577); 307 308 max14577->regmap_pmic = devm_regmap_init_i2c(max14577->i2c_pmic, 309 &max77836_pmic_regmap_config); 310 if (IS_ERR(max14577->regmap_pmic)) { 311 ret = PTR_ERR(max14577->regmap_pmic); 312 dev_err(max14577->dev, "Failed to allocate PMIC register map: %d\n", 313 ret); 314 goto err; 315 } 316 317 /* Un-mask MAX77836 Interrupt Source register */ 318 ret = max14577_read_reg(max14577->regmap_pmic, 319 MAX77836_PMIC_REG_INTSRC_MASK, &intsrc_mask); 320 if (ret < 0) { 321 dev_err(max14577->dev, "Failed to read PMIC register\n"); 322 goto err; 323 } 324 325 intsrc_mask &= ~(MAX77836_INTSRC_MASK_TOP_INT_MASK); 326 intsrc_mask &= ~(MAX77836_INTSRC_MASK_MUIC_CHG_INT_MASK); 327 ret = max14577_write_reg(max14577->regmap_pmic, 328 MAX77836_PMIC_REG_INTSRC_MASK, intsrc_mask); 329 if (ret < 0) { 330 dev_err(max14577->dev, "Failed to write PMIC register\n"); 331 goto err; 332 } 333 334 ret = regmap_add_irq_chip(max14577->regmap_pmic, max14577->irq, 335 IRQF_ONESHOT | IRQF_SHARED, 336 0, &max77836_pmic_irq_chip, 337 &max14577->irq_data_pmic); 338 if (ret != 0) { 339 dev_err(max14577->dev, "Failed to request PMIC IRQ %d: %d\n", 340 max14577->irq, ret); 341 goto err; 342 } 343 344 return 0; 345 346 err: 347 i2c_unregister_device(max14577->i2c_pmic); 348 349 return ret; 350 } 351 352 /* 353 * Max77836 specific de-initialization code for driver remove. 354 */ 355 static void max77836_remove(struct max14577 *max14577) 356 { 357 regmap_del_irq_chip(max14577->irq, max14577->irq_data_pmic); 358 i2c_unregister_device(max14577->i2c_pmic); 359 } 360 361 static int max14577_i2c_probe(struct i2c_client *i2c, 362 const struct i2c_device_id *id) 363 { 364 struct max14577 *max14577; 365 struct max14577_platform_data *pdata = dev_get_platdata(&i2c->dev); 366 struct device_node *np = i2c->dev.of_node; 367 int ret = 0; 368 const struct regmap_irq_chip *irq_chip; 369 const struct mfd_cell *mfd_devs; 370 unsigned int mfd_devs_size; 371 int irq_flags; 372 373 if (np) { 374 pdata = devm_kzalloc(&i2c->dev, sizeof(*pdata), GFP_KERNEL); 375 if (!pdata) 376 return -ENOMEM; 377 i2c->dev.platform_data = pdata; 378 } 379 380 if (!pdata) { 381 dev_err(&i2c->dev, "No platform data found.\n"); 382 return -EINVAL; 383 } 384 385 max14577 = devm_kzalloc(&i2c->dev, sizeof(*max14577), GFP_KERNEL); 386 if (!max14577) 387 return -ENOMEM; 388 389 i2c_set_clientdata(i2c, max14577); 390 max14577->dev = &i2c->dev; 391 max14577->i2c = i2c; 392 max14577->irq = i2c->irq; 393 394 max14577->regmap = devm_regmap_init_i2c(i2c, 395 &max14577_muic_regmap_config); 396 if (IS_ERR(max14577->regmap)) { 397 ret = PTR_ERR(max14577->regmap); 398 dev_err(max14577->dev, "Failed to allocate register map: %d\n", 399 ret); 400 return ret; 401 } 402 403 if (np) { 404 const struct of_device_id *of_id; 405 406 of_id = of_match_device(max14577_dt_match, &i2c->dev); 407 if (of_id) 408 max14577->dev_type = 409 (enum maxim_device_type)of_id->data; 410 } else { 411 max14577->dev_type = id->driver_data; 412 } 413 414 max14577_print_dev_type(max14577); 415 416 switch (max14577->dev_type) { 417 case MAXIM_DEVICE_TYPE_MAX77836: 418 irq_chip = &max77836_muic_irq_chip; 419 mfd_devs = max77836_devs; 420 mfd_devs_size = ARRAY_SIZE(max77836_devs); 421 irq_flags = IRQF_ONESHOT | IRQF_SHARED; 422 break; 423 case MAXIM_DEVICE_TYPE_MAX14577: 424 default: 425 irq_chip = &max14577_irq_chip; 426 mfd_devs = max14577_devs; 427 mfd_devs_size = ARRAY_SIZE(max14577_devs); 428 irq_flags = IRQF_ONESHOT; 429 break; 430 } 431 432 ret = regmap_add_irq_chip(max14577->regmap, max14577->irq, 433 irq_flags, 0, irq_chip, 434 &max14577->irq_data); 435 if (ret != 0) { 436 dev_err(&i2c->dev, "Failed to request IRQ %d: %d\n", 437 max14577->irq, ret); 438 return ret; 439 } 440 441 /* Max77836 specific initialization code (additional regmap) */ 442 if (max14577->dev_type == MAXIM_DEVICE_TYPE_MAX77836) { 443 ret = max77836_init(max14577); 444 if (ret < 0) 445 goto err_max77836; 446 } 447 448 ret = mfd_add_devices(max14577->dev, -1, mfd_devs, 449 mfd_devs_size, NULL, 0, NULL); 450 if (ret < 0) 451 goto err_mfd; 452 453 device_init_wakeup(max14577->dev, 1); 454 455 return 0; 456 457 err_mfd: 458 if (max14577->dev_type == MAXIM_DEVICE_TYPE_MAX77836) 459 max77836_remove(max14577); 460 err_max77836: 461 regmap_del_irq_chip(max14577->irq, max14577->irq_data); 462 463 return ret; 464 } 465 466 static int max14577_i2c_remove(struct i2c_client *i2c) 467 { 468 struct max14577 *max14577 = i2c_get_clientdata(i2c); 469 470 mfd_remove_devices(max14577->dev); 471 regmap_del_irq_chip(max14577->irq, max14577->irq_data); 472 if (max14577->dev_type == MAXIM_DEVICE_TYPE_MAX77836) 473 max77836_remove(max14577); 474 475 return 0; 476 } 477 478 static const struct i2c_device_id max14577_i2c_id[] = { 479 { "max14577", MAXIM_DEVICE_TYPE_MAX14577, }, 480 { "max77836", MAXIM_DEVICE_TYPE_MAX77836, }, 481 { } 482 }; 483 MODULE_DEVICE_TABLE(i2c, max14577_i2c_id); 484 485 #ifdef CONFIG_PM_SLEEP 486 static int max14577_suspend(struct device *dev) 487 { 488 struct i2c_client *i2c = to_i2c_client(dev); 489 struct max14577 *max14577 = i2c_get_clientdata(i2c); 490 491 if (device_may_wakeup(dev)) 492 enable_irq_wake(max14577->irq); 493 /* 494 * MUIC IRQ must be disabled during suspend because if it happens 495 * while suspended it will be handled before resuming I2C. 496 * 497 * When device is woken up from suspend (e.g. by ADC change), 498 * an interrupt occurs before resuming I2C bus controller. 499 * Interrupt handler tries to read registers but this read 500 * will fail because I2C is still suspended. 501 */ 502 disable_irq(max14577->irq); 503 504 return 0; 505 } 506 507 static int max14577_resume(struct device *dev) 508 { 509 struct i2c_client *i2c = to_i2c_client(dev); 510 struct max14577 *max14577 = i2c_get_clientdata(i2c); 511 512 if (device_may_wakeup(dev)) 513 disable_irq_wake(max14577->irq); 514 enable_irq(max14577->irq); 515 516 return 0; 517 } 518 #endif /* CONFIG_PM_SLEEP */ 519 520 static SIMPLE_DEV_PM_OPS(max14577_pm, max14577_suspend, max14577_resume); 521 522 static struct i2c_driver max14577_i2c_driver = { 523 .driver = { 524 .name = "max14577", 525 .pm = &max14577_pm, 526 .of_match_table = max14577_dt_match, 527 }, 528 .probe = max14577_i2c_probe, 529 .remove = max14577_i2c_remove, 530 .id_table = max14577_i2c_id, 531 }; 532 533 static int __init max14577_i2c_init(void) 534 { 535 BUILD_BUG_ON(ARRAY_SIZE(max14577_i2c_id) != MAXIM_DEVICE_TYPE_NUM); 536 BUILD_BUG_ON(ARRAY_SIZE(max14577_dt_match) != MAXIM_DEVICE_TYPE_NUM); 537 538 /* Valid charger current values must be provided for each chipset */ 539 BUILD_BUG_ON(ARRAY_SIZE(maxim_charger_currents) != MAXIM_DEVICE_TYPE_NUM); 540 541 /* Check for valid values for charger */ 542 BUILD_BUG_ON(MAX14577_CHARGER_CURRENT_LIMIT_HIGH_START + 543 MAX14577_CHARGER_CURRENT_LIMIT_HIGH_STEP * 0xf != 544 MAX14577_CHARGER_CURRENT_LIMIT_MAX); 545 BUILD_BUG_ON(MAX14577_CHARGER_CURRENT_LIMIT_HIGH_STEP == 0); 546 547 BUILD_BUG_ON(MAX77836_CHARGER_CURRENT_LIMIT_HIGH_START + 548 MAX77836_CHARGER_CURRENT_LIMIT_HIGH_STEP * 0xf != 549 MAX77836_CHARGER_CURRENT_LIMIT_MAX); 550 BUILD_BUG_ON(MAX77836_CHARGER_CURRENT_LIMIT_HIGH_STEP == 0); 551 552 return i2c_add_driver(&max14577_i2c_driver); 553 } 554 module_init(max14577_i2c_init); 555 556 static void __exit max14577_i2c_exit(void) 557 { 558 i2c_del_driver(&max14577_i2c_driver); 559 } 560 module_exit(max14577_i2c_exit); 561 562 MODULE_AUTHOR("Chanwoo Choi <cw00.choi@samsung.com>, Krzysztof Kozlowski <krzk@kernel.org>"); 563 MODULE_DESCRIPTION("Maxim 14577/77836 multi-function core driver"); 564 MODULE_LICENSE("GPL"); 565