1 /* 2 * max8973-regulator.c -- Maxim max8973A 3 * 4 * Regulator driver for MAXIM 8973A DC-DC step-down switching regulator. 5 * 6 * Copyright (c) 2012, NVIDIA Corporation. 7 * 8 * Author: Laxman Dewangan <ldewangan@nvidia.com> 9 * 10 * This program is free software; you can redistribute it and/or 11 * modify it under the terms of the GNU General Public License as 12 * published by the Free Software Foundation version 2. 13 * 14 * This program is distributed "as is" WITHOUT ANY WARRANTY of any kind, 15 * whether express or implied; without even the implied warranty of 16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 17 * General Public License for more details. 18 * 19 * You should have received a copy of the GNU General Public License 20 * along with this program; if not, write to the Free Software 21 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 22 * 02111-1307, USA 23 */ 24 25 #include <linux/kernel.h> 26 #include <linux/module.h> 27 #include <linux/init.h> 28 #include <linux/err.h> 29 #include <linux/of.h> 30 #include <linux/of_device.h> 31 #include <linux/platform_device.h> 32 #include <linux/regulator/driver.h> 33 #include <linux/regulator/machine.h> 34 #include <linux/regulator/max8973-regulator.h> 35 #include <linux/regulator/of_regulator.h> 36 #include <linux/gpio.h> 37 #include <linux/gpio/consumer.h> 38 #include <linux/of_gpio.h> 39 #include <linux/i2c.h> 40 #include <linux/slab.h> 41 #include <linux/regmap.h> 42 #include <linux/thermal.h> 43 #include <linux/irq.h> 44 #include <linux/interrupt.h> 45 46 /* Register definitions */ 47 #define MAX8973_VOUT 0x0 48 #define MAX8973_VOUT_DVS 0x1 49 #define MAX8973_CONTROL1 0x2 50 #define MAX8973_CONTROL2 0x3 51 #define MAX8973_CHIPID1 0x4 52 #define MAX8973_CHIPID2 0x5 53 54 #define MAX8973_MAX_VOUT_REG 2 55 56 /* MAX8973_VOUT */ 57 #define MAX8973_VOUT_ENABLE BIT(7) 58 #define MAX8973_VOUT_MASK 0x7F 59 60 /* MAX8973_VOUT_DVS */ 61 #define MAX8973_DVS_VOUT_MASK 0x7F 62 63 /* MAX8973_CONTROL1 */ 64 #define MAX8973_SNS_ENABLE BIT(7) 65 #define MAX8973_FPWM_EN_M BIT(6) 66 #define MAX8973_NFSR_ENABLE BIT(5) 67 #define MAX8973_AD_ENABLE BIT(4) 68 #define MAX8973_BIAS_ENABLE BIT(3) 69 #define MAX8973_FREQSHIFT_9PER BIT(2) 70 71 #define MAX8973_RAMP_12mV_PER_US 0x0 72 #define MAX8973_RAMP_25mV_PER_US 0x1 73 #define MAX8973_RAMP_50mV_PER_US 0x2 74 #define MAX8973_RAMP_200mV_PER_US 0x3 75 #define MAX8973_RAMP_MASK 0x3 76 77 /* MAX8973_CONTROL2 */ 78 #define MAX8973_WDTMR_ENABLE BIT(6) 79 #define MAX8973_DISCH_ENBABLE BIT(5) 80 #define MAX8973_FT_ENABLE BIT(4) 81 #define MAX77621_T_JUNCTION_120 BIT(7) 82 83 #define MAX8973_CKKADV_TRIP_MASK 0xC 84 #define MAX8973_CKKADV_TRIP_DISABLE 0xC 85 #define MAX8973_CKKADV_TRIP_75mV_PER_US 0x0 86 #define MAX8973_CKKADV_TRIP_150mV_PER_US 0x4 87 #define MAX8973_CKKADV_TRIP_75mV_PER_US_HIST_DIS 0x8 88 #define MAX8973_CONTROL_CLKADV_TRIP_MASK 0x00030000 89 90 #define MAX8973_INDUCTOR_MIN_30_PER 0x0 91 #define MAX8973_INDUCTOR_NOMINAL 0x1 92 #define MAX8973_INDUCTOR_PLUS_30_PER 0x2 93 #define MAX8973_INDUCTOR_PLUS_60_PER 0x3 94 #define MAX8973_CONTROL_INDUCTOR_VALUE_MASK 0x00300000 95 96 #define MAX8973_MIN_VOLATGE 606250 97 #define MAX8973_MAX_VOLATGE 1400000 98 #define MAX8973_VOLATGE_STEP 6250 99 #define MAX8973_BUCK_N_VOLTAGE 0x80 100 101 #define MAX77621_CHIPID_TJINT_S BIT(0) 102 103 #define MAX77621_NORMAL_OPERATING_TEMP 100000 104 #define MAX77621_TJINT_WARNING_TEMP_120 120000 105 #define MAX77621_TJINT_WARNING_TEMP_140 140000 106 107 enum device_id { 108 MAX8973, 109 MAX77621 110 }; 111 112 /* Maxim 8973 chip information */ 113 struct max8973_chip { 114 struct device *dev; 115 struct regulator_desc desc; 116 struct regmap *regmap; 117 bool enable_external_control; 118 int dvs_gpio; 119 int lru_index[MAX8973_MAX_VOUT_REG]; 120 int curr_vout_val[MAX8973_MAX_VOUT_REG]; 121 int curr_vout_reg; 122 int curr_gpio_val; 123 struct regulator_ops ops; 124 enum device_id id; 125 int junction_temp_warning; 126 int irq; 127 struct thermal_zone_device *tz_device; 128 }; 129 130 /* 131 * find_voltage_set_register: Find new voltage configuration register (VOUT). 132 * The finding of the new VOUT register will be based on the LRU mechanism. 133 * Each VOUT register will have different voltage configured . This 134 * Function will look if any of the VOUT register have requested voltage set 135 * or not. 136 * - If it is already there then it will make that register as most 137 * recently used and return as found so that caller need not to set 138 * the VOUT register but need to set the proper gpios to select this 139 * VOUT register. 140 * - If requested voltage is not found then it will use the least 141 * recently mechanism to get new VOUT register for new configuration 142 * and will return not_found so that caller need to set new VOUT 143 * register and then gpios (both). 144 */ 145 static bool find_voltage_set_register(struct max8973_chip *tps, 146 int req_vsel, int *vout_reg, int *gpio_val) 147 { 148 int i; 149 bool found = false; 150 int new_vout_reg = tps->lru_index[MAX8973_MAX_VOUT_REG - 1]; 151 int found_index = MAX8973_MAX_VOUT_REG - 1; 152 153 for (i = 0; i < MAX8973_MAX_VOUT_REG; ++i) { 154 if (tps->curr_vout_val[tps->lru_index[i]] == req_vsel) { 155 new_vout_reg = tps->lru_index[i]; 156 found_index = i; 157 found = true; 158 goto update_lru_index; 159 } 160 } 161 162 update_lru_index: 163 for (i = found_index; i > 0; i--) 164 tps->lru_index[i] = tps->lru_index[i - 1]; 165 166 tps->lru_index[0] = new_vout_reg; 167 *gpio_val = new_vout_reg; 168 *vout_reg = MAX8973_VOUT + new_vout_reg; 169 return found; 170 } 171 172 static int max8973_dcdc_get_voltage_sel(struct regulator_dev *rdev) 173 { 174 struct max8973_chip *max = rdev_get_drvdata(rdev); 175 unsigned int data; 176 int ret; 177 178 ret = regmap_read(max->regmap, max->curr_vout_reg, &data); 179 if (ret < 0) { 180 dev_err(max->dev, "register %d read failed, err = %d\n", 181 max->curr_vout_reg, ret); 182 return ret; 183 } 184 return data & MAX8973_VOUT_MASK; 185 } 186 187 static int max8973_dcdc_set_voltage_sel(struct regulator_dev *rdev, 188 unsigned vsel) 189 { 190 struct max8973_chip *max = rdev_get_drvdata(rdev); 191 int ret; 192 bool found = false; 193 int vout_reg = max->curr_vout_reg; 194 int gpio_val = max->curr_gpio_val; 195 196 /* 197 * If gpios are available to select the VOUT register then least 198 * recently used register for new configuration. 199 */ 200 if (gpio_is_valid(max->dvs_gpio)) 201 found = find_voltage_set_register(max, vsel, 202 &vout_reg, &gpio_val); 203 204 if (!found) { 205 ret = regmap_update_bits(max->regmap, vout_reg, 206 MAX8973_VOUT_MASK, vsel); 207 if (ret < 0) { 208 dev_err(max->dev, "register %d update failed, err %d\n", 209 vout_reg, ret); 210 return ret; 211 } 212 max->curr_vout_reg = vout_reg; 213 max->curr_vout_val[gpio_val] = vsel; 214 } 215 216 /* Select proper VOUT register vio gpios */ 217 if (gpio_is_valid(max->dvs_gpio)) { 218 gpio_set_value_cansleep(max->dvs_gpio, gpio_val & 0x1); 219 max->curr_gpio_val = gpio_val; 220 } 221 return 0; 222 } 223 224 static int max8973_dcdc_set_mode(struct regulator_dev *rdev, unsigned int mode) 225 { 226 struct max8973_chip *max = rdev_get_drvdata(rdev); 227 int ret; 228 int pwm; 229 230 /* Enable force PWM mode in FAST mode only. */ 231 switch (mode) { 232 case REGULATOR_MODE_FAST: 233 pwm = MAX8973_FPWM_EN_M; 234 break; 235 236 case REGULATOR_MODE_NORMAL: 237 pwm = 0; 238 break; 239 240 default: 241 return -EINVAL; 242 } 243 244 ret = regmap_update_bits(max->regmap, MAX8973_CONTROL1, 245 MAX8973_FPWM_EN_M, pwm); 246 if (ret < 0) 247 dev_err(max->dev, "register %d update failed, err %d\n", 248 MAX8973_CONTROL1, ret); 249 return ret; 250 } 251 252 static unsigned int max8973_dcdc_get_mode(struct regulator_dev *rdev) 253 { 254 struct max8973_chip *max = rdev_get_drvdata(rdev); 255 unsigned int data; 256 int ret; 257 258 ret = regmap_read(max->regmap, MAX8973_CONTROL1, &data); 259 if (ret < 0) { 260 dev_err(max->dev, "register %d read failed, err %d\n", 261 MAX8973_CONTROL1, ret); 262 return ret; 263 } 264 return (data & MAX8973_FPWM_EN_M) ? 265 REGULATOR_MODE_FAST : REGULATOR_MODE_NORMAL; 266 } 267 268 static int max8973_set_current_limit(struct regulator_dev *rdev, 269 int min_ua, int max_ua) 270 { 271 struct max8973_chip *max = rdev_get_drvdata(rdev); 272 unsigned int val; 273 int ret; 274 275 if (max_ua <= 9000000) 276 val = MAX8973_CKKADV_TRIP_75mV_PER_US; 277 else if (max_ua <= 12000000) 278 val = MAX8973_CKKADV_TRIP_150mV_PER_US; 279 else 280 val = MAX8973_CKKADV_TRIP_DISABLE; 281 282 ret = regmap_update_bits(max->regmap, MAX8973_CONTROL2, 283 MAX8973_CKKADV_TRIP_MASK, val); 284 if (ret < 0) { 285 dev_err(max->dev, "register %d update failed: %d\n", 286 MAX8973_CONTROL2, ret); 287 return ret; 288 } 289 return 0; 290 } 291 292 static int max8973_get_current_limit(struct regulator_dev *rdev) 293 { 294 struct max8973_chip *max = rdev_get_drvdata(rdev); 295 unsigned int control2; 296 int ret; 297 298 ret = regmap_read(max->regmap, MAX8973_CONTROL2, &control2); 299 if (ret < 0) { 300 dev_err(max->dev, "register %d read failed: %d\n", 301 MAX8973_CONTROL2, ret); 302 return ret; 303 } 304 switch (control2 & MAX8973_CKKADV_TRIP_MASK) { 305 case MAX8973_CKKADV_TRIP_DISABLE: 306 return 15000000; 307 case MAX8973_CKKADV_TRIP_150mV_PER_US: 308 return 12000000; 309 case MAX8973_CKKADV_TRIP_75mV_PER_US: 310 return 9000000; 311 default: 312 break; 313 } 314 return 9000000; 315 } 316 317 static const unsigned int max8973_buck_ramp_table[] = { 318 12000, 25000, 50000, 200000 319 }; 320 321 static const struct regulator_ops max8973_dcdc_ops = { 322 .get_voltage_sel = max8973_dcdc_get_voltage_sel, 323 .set_voltage_sel = max8973_dcdc_set_voltage_sel, 324 .list_voltage = regulator_list_voltage_linear, 325 .set_mode = max8973_dcdc_set_mode, 326 .get_mode = max8973_dcdc_get_mode, 327 .set_voltage_time_sel = regulator_set_voltage_time_sel, 328 .set_ramp_delay = regulator_set_ramp_delay_regmap, 329 }; 330 331 static int max8973_init_dcdc(struct max8973_chip *max, 332 struct max8973_regulator_platform_data *pdata) 333 { 334 int ret; 335 uint8_t control1 = 0; 336 uint8_t control2 = 0; 337 unsigned int data; 338 339 ret = regmap_read(max->regmap, MAX8973_CONTROL1, &data); 340 if (ret < 0) { 341 dev_err(max->dev, "register %d read failed, err = %d", 342 MAX8973_CONTROL1, ret); 343 return ret; 344 } 345 control1 = data & MAX8973_RAMP_MASK; 346 switch (control1) { 347 case MAX8973_RAMP_12mV_PER_US: 348 max->desc.ramp_delay = 12000; 349 break; 350 case MAX8973_RAMP_25mV_PER_US: 351 max->desc.ramp_delay = 25000; 352 break; 353 case MAX8973_RAMP_50mV_PER_US: 354 max->desc.ramp_delay = 50000; 355 break; 356 case MAX8973_RAMP_200mV_PER_US: 357 max->desc.ramp_delay = 200000; 358 break; 359 } 360 361 if (pdata->control_flags & MAX8973_CONTROL_REMOTE_SENSE_ENABLE) 362 control1 |= MAX8973_SNS_ENABLE; 363 364 if (!(pdata->control_flags & MAX8973_CONTROL_FALLING_SLEW_RATE_ENABLE)) 365 control1 |= MAX8973_NFSR_ENABLE; 366 367 if (pdata->control_flags & MAX8973_CONTROL_OUTPUT_ACTIVE_DISCH_ENABLE) 368 control1 |= MAX8973_AD_ENABLE; 369 370 if (pdata->control_flags & MAX8973_CONTROL_BIAS_ENABLE) { 371 control1 |= MAX8973_BIAS_ENABLE; 372 max->desc.enable_time = 20; 373 } else { 374 max->desc.enable_time = 240; 375 } 376 377 if (pdata->control_flags & MAX8973_CONTROL_FREQ_SHIFT_9PER_ENABLE) 378 control1 |= MAX8973_FREQSHIFT_9PER; 379 380 if ((pdata->junction_temp_warning == MAX77621_TJINT_WARNING_TEMP_120) && 381 (max->id == MAX77621)) 382 control2 |= MAX77621_T_JUNCTION_120; 383 384 if (!(pdata->control_flags & MAX8973_CONTROL_PULL_DOWN_ENABLE)) 385 control2 |= MAX8973_DISCH_ENBABLE; 386 387 /* Clock advance trip configuration */ 388 switch (pdata->control_flags & MAX8973_CONTROL_CLKADV_TRIP_MASK) { 389 case MAX8973_CONTROL_CLKADV_TRIP_DISABLED: 390 control2 |= MAX8973_CKKADV_TRIP_DISABLE; 391 break; 392 393 case MAX8973_CONTROL_CLKADV_TRIP_75mV_PER_US: 394 control2 |= MAX8973_CKKADV_TRIP_75mV_PER_US; 395 break; 396 397 case MAX8973_CONTROL_CLKADV_TRIP_150mV_PER_US: 398 control2 |= MAX8973_CKKADV_TRIP_150mV_PER_US; 399 break; 400 401 case MAX8973_CONTROL_CLKADV_TRIP_75mV_PER_US_HIST_DIS: 402 control2 |= MAX8973_CKKADV_TRIP_75mV_PER_US_HIST_DIS; 403 break; 404 } 405 406 /* Configure inductor value */ 407 switch (pdata->control_flags & MAX8973_CONTROL_INDUCTOR_VALUE_MASK) { 408 case MAX8973_CONTROL_INDUCTOR_VALUE_NOMINAL: 409 control2 |= MAX8973_INDUCTOR_NOMINAL; 410 break; 411 412 case MAX8973_CONTROL_INDUCTOR_VALUE_MINUS_30_PER: 413 control2 |= MAX8973_INDUCTOR_MIN_30_PER; 414 break; 415 416 case MAX8973_CONTROL_INDUCTOR_VALUE_PLUS_30_PER: 417 control2 |= MAX8973_INDUCTOR_PLUS_30_PER; 418 break; 419 420 case MAX8973_CONTROL_INDUCTOR_VALUE_PLUS_60_PER: 421 control2 |= MAX8973_INDUCTOR_PLUS_60_PER; 422 break; 423 } 424 425 ret = regmap_write(max->regmap, MAX8973_CONTROL1, control1); 426 if (ret < 0) { 427 dev_err(max->dev, "register %d write failed, err = %d", 428 MAX8973_CONTROL1, ret); 429 return ret; 430 } 431 432 ret = regmap_write(max->regmap, MAX8973_CONTROL2, control2); 433 if (ret < 0) { 434 dev_err(max->dev, "register %d write failed, err = %d", 435 MAX8973_CONTROL2, ret); 436 return ret; 437 } 438 439 /* If external control is enabled then disable EN bit */ 440 if (max->enable_external_control && (max->id == MAX8973)) { 441 ret = regmap_update_bits(max->regmap, MAX8973_VOUT, 442 MAX8973_VOUT_ENABLE, 0); 443 if (ret < 0) 444 dev_err(max->dev, "register %d update failed, err = %d", 445 MAX8973_VOUT, ret); 446 } 447 return ret; 448 } 449 450 static int max8973_thermal_read_temp(void *data, int *temp) 451 { 452 struct max8973_chip *mchip = data; 453 unsigned int val; 454 int ret; 455 456 ret = regmap_read(mchip->regmap, MAX8973_CHIPID1, &val); 457 if (ret < 0) { 458 dev_err(mchip->dev, "Failed to read register CHIPID1, %d", ret); 459 return ret; 460 } 461 462 /* +1 degC to trigger cool device */ 463 if (val & MAX77621_CHIPID_TJINT_S) 464 *temp = mchip->junction_temp_warning + 1000; 465 else 466 *temp = MAX77621_NORMAL_OPERATING_TEMP; 467 468 return 0; 469 } 470 471 static irqreturn_t max8973_thermal_irq(int irq, void *data) 472 { 473 struct max8973_chip *mchip = data; 474 475 thermal_zone_device_update(mchip->tz_device, 476 THERMAL_EVENT_UNSPECIFIED); 477 478 return IRQ_HANDLED; 479 } 480 481 static const struct thermal_zone_of_device_ops max77621_tz_ops = { 482 .get_temp = max8973_thermal_read_temp, 483 }; 484 485 static int max8973_thermal_init(struct max8973_chip *mchip) 486 { 487 struct thermal_zone_device *tzd; 488 struct irq_data *irq_data; 489 unsigned long irq_flags = 0; 490 int ret; 491 492 if (mchip->id != MAX77621) 493 return 0; 494 495 tzd = devm_thermal_zone_of_sensor_register(mchip->dev, 0, mchip, 496 &max77621_tz_ops); 497 if (IS_ERR(tzd)) { 498 ret = PTR_ERR(tzd); 499 dev_err(mchip->dev, "Failed to register thermal sensor: %d\n", 500 ret); 501 return ret; 502 } 503 504 if (mchip->irq <= 0) 505 return 0; 506 507 irq_data = irq_get_irq_data(mchip->irq); 508 if (irq_data) 509 irq_flags = irqd_get_trigger_type(irq_data); 510 511 ret = devm_request_threaded_irq(mchip->dev, mchip->irq, NULL, 512 max8973_thermal_irq, 513 IRQF_ONESHOT | IRQF_SHARED | irq_flags, 514 dev_name(mchip->dev), mchip); 515 if (ret < 0) { 516 dev_err(mchip->dev, "Failed to request irq %d, %d\n", 517 mchip->irq, ret); 518 return ret; 519 } 520 521 return 0; 522 } 523 524 static const struct regmap_config max8973_regmap_config = { 525 .reg_bits = 8, 526 .val_bits = 8, 527 .max_register = MAX8973_CHIPID2, 528 .cache_type = REGCACHE_RBTREE, 529 }; 530 531 static struct max8973_regulator_platform_data *max8973_parse_dt( 532 struct device *dev) 533 { 534 struct max8973_regulator_platform_data *pdata; 535 struct device_node *np = dev->of_node; 536 int ret; 537 u32 pval; 538 bool etr_enable; 539 bool etr_sensitivity_high; 540 541 pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL); 542 if (!pdata) 543 return NULL; 544 545 pdata->enable_ext_control = of_property_read_bool(np, 546 "maxim,externally-enable"); 547 pdata->dvs_gpio = of_get_named_gpio(np, "maxim,dvs-gpio", 0); 548 549 ret = of_property_read_u32(np, "maxim,dvs-default-state", &pval); 550 if (!ret) 551 pdata->dvs_def_state = pval; 552 553 if (of_property_read_bool(np, "maxim,enable-remote-sense")) 554 pdata->control_flags |= MAX8973_CONTROL_REMOTE_SENSE_ENABLE; 555 556 if (of_property_read_bool(np, "maxim,enable-falling-slew-rate")) 557 pdata->control_flags |= 558 MAX8973_CONTROL_FALLING_SLEW_RATE_ENABLE; 559 560 if (of_property_read_bool(np, "maxim,enable-active-discharge")) 561 pdata->control_flags |= 562 MAX8973_CONTROL_OUTPUT_ACTIVE_DISCH_ENABLE; 563 564 if (of_property_read_bool(np, "maxim,enable-frequency-shift")) 565 pdata->control_flags |= MAX8973_CONTROL_FREQ_SHIFT_9PER_ENABLE; 566 567 if (of_property_read_bool(np, "maxim,enable-bias-control")) 568 pdata->control_flags |= MAX8973_CONTROL_BIAS_ENABLE; 569 570 etr_enable = of_property_read_bool(np, "maxim,enable-etr"); 571 etr_sensitivity_high = of_property_read_bool(np, 572 "maxim,enable-high-etr-sensitivity"); 573 if (etr_sensitivity_high) 574 etr_enable = true; 575 576 if (etr_enable) { 577 if (etr_sensitivity_high) 578 pdata->control_flags |= 579 MAX8973_CONTROL_CLKADV_TRIP_75mV_PER_US; 580 else 581 pdata->control_flags |= 582 MAX8973_CONTROL_CLKADV_TRIP_150mV_PER_US; 583 } else { 584 pdata->control_flags |= MAX8973_CONTROL_CLKADV_TRIP_DISABLED; 585 } 586 587 pdata->junction_temp_warning = MAX77621_TJINT_WARNING_TEMP_140; 588 ret = of_property_read_u32(np, "junction-warn-millicelsius", &pval); 589 if (!ret && (pval <= MAX77621_TJINT_WARNING_TEMP_120)) 590 pdata->junction_temp_warning = MAX77621_TJINT_WARNING_TEMP_120; 591 592 return pdata; 593 } 594 595 static const struct of_device_id of_max8973_match_tbl[] = { 596 { .compatible = "maxim,max8973", .data = (void *)MAX8973, }, 597 { .compatible = "maxim,max77621", .data = (void *)MAX77621, }, 598 { }, 599 }; 600 MODULE_DEVICE_TABLE(of, of_max8973_match_tbl); 601 602 static int max8973_probe(struct i2c_client *client, 603 const struct i2c_device_id *id) 604 { 605 struct max8973_regulator_platform_data *pdata; 606 struct regulator_init_data *ridata; 607 struct regulator_config config = { }; 608 struct regulator_dev *rdev; 609 struct max8973_chip *max; 610 bool pdata_from_dt = false; 611 unsigned int chip_id; 612 struct gpio_desc *gpiod; 613 enum gpiod_flags gflags; 614 int ret; 615 616 pdata = dev_get_platdata(&client->dev); 617 618 if (!pdata && client->dev.of_node) { 619 pdata = max8973_parse_dt(&client->dev); 620 pdata_from_dt = true; 621 } 622 623 if (!pdata) { 624 dev_err(&client->dev, "No Platform data"); 625 return -EIO; 626 } 627 628 if (pdata->dvs_gpio == -EPROBE_DEFER) 629 return -EPROBE_DEFER; 630 631 max = devm_kzalloc(&client->dev, sizeof(*max), GFP_KERNEL); 632 if (!max) 633 return -ENOMEM; 634 635 max->regmap = devm_regmap_init_i2c(client, &max8973_regmap_config); 636 if (IS_ERR(max->regmap)) { 637 ret = PTR_ERR(max->regmap); 638 dev_err(&client->dev, "regmap init failed, err %d\n", ret); 639 return ret; 640 } 641 642 if (client->dev.of_node) { 643 const struct of_device_id *match; 644 645 match = of_match_device(of_match_ptr(of_max8973_match_tbl), 646 &client->dev); 647 if (!match) 648 return -ENODATA; 649 max->id = (u32)((uintptr_t)match->data); 650 } else { 651 max->id = id->driver_data; 652 } 653 654 ret = regmap_read(max->regmap, MAX8973_CHIPID1, &chip_id); 655 if (ret < 0) { 656 dev_err(&client->dev, "register CHIPID1 read failed, %d", ret); 657 return ret; 658 } 659 660 dev_info(&client->dev, "CHIP-ID OTP: 0x%02x ID_M: 0x%02x\n", 661 (chip_id >> 4) & 0xF, (chip_id >> 1) & 0x7); 662 663 i2c_set_clientdata(client, max); 664 max->ops = max8973_dcdc_ops; 665 max->dev = &client->dev; 666 max->desc.name = id->name; 667 max->desc.id = 0; 668 max->desc.ops = &max->ops; 669 max->desc.type = REGULATOR_VOLTAGE; 670 max->desc.owner = THIS_MODULE; 671 max->desc.min_uV = MAX8973_MIN_VOLATGE; 672 max->desc.uV_step = MAX8973_VOLATGE_STEP; 673 max->desc.n_voltages = MAX8973_BUCK_N_VOLTAGE; 674 max->desc.ramp_reg = MAX8973_CONTROL1; 675 max->desc.ramp_mask = MAX8973_RAMP_MASK; 676 max->desc.ramp_delay_table = max8973_buck_ramp_table; 677 max->desc.n_ramp_values = ARRAY_SIZE(max8973_buck_ramp_table); 678 679 max->dvs_gpio = (pdata->dvs_gpio) ? pdata->dvs_gpio : -EINVAL; 680 max->enable_external_control = pdata->enable_ext_control; 681 max->curr_gpio_val = pdata->dvs_def_state; 682 max->curr_vout_reg = MAX8973_VOUT + pdata->dvs_def_state; 683 max->junction_temp_warning = pdata->junction_temp_warning; 684 685 max->lru_index[0] = max->curr_vout_reg; 686 687 if (gpio_is_valid(max->dvs_gpio)) { 688 int gpio_flags; 689 int i; 690 691 gpio_flags = (pdata->dvs_def_state) ? 692 GPIOF_OUT_INIT_HIGH : GPIOF_OUT_INIT_LOW; 693 ret = devm_gpio_request_one(&client->dev, max->dvs_gpio, 694 gpio_flags, "max8973-dvs"); 695 if (ret) { 696 dev_err(&client->dev, 697 "gpio_request for gpio %d failed, err = %d\n", 698 max->dvs_gpio, ret); 699 return ret; 700 } 701 702 /* 703 * Initialize the lru index with vout_reg id 704 * The index 0 will be most recently used and 705 * set with the max->curr_vout_reg */ 706 for (i = 0; i < MAX8973_MAX_VOUT_REG; ++i) 707 max->lru_index[i] = i; 708 max->lru_index[0] = max->curr_vout_reg; 709 max->lru_index[max->curr_vout_reg] = 0; 710 } else { 711 /* 712 * If there is no DVS GPIO, the VOUT register 713 * address is fixed. 714 */ 715 max->ops.set_voltage_sel = regulator_set_voltage_sel_regmap; 716 max->ops.get_voltage_sel = regulator_get_voltage_sel_regmap; 717 max->desc.vsel_reg = max->curr_vout_reg; 718 max->desc.vsel_mask = MAX8973_VOUT_MASK; 719 } 720 721 if (pdata_from_dt) 722 pdata->reg_init_data = of_get_regulator_init_data(&client->dev, 723 client->dev.of_node, &max->desc); 724 725 ridata = pdata->reg_init_data; 726 switch (max->id) { 727 case MAX8973: 728 if (!pdata->enable_ext_control) { 729 max->desc.enable_reg = MAX8973_VOUT; 730 max->desc.enable_mask = MAX8973_VOUT_ENABLE; 731 max->ops.enable = regulator_enable_regmap; 732 max->ops.disable = regulator_disable_regmap; 733 max->ops.is_enabled = regulator_is_enabled_regmap; 734 break; 735 } 736 737 if (ridata && (ridata->constraints.always_on || 738 ridata->constraints.boot_on)) 739 gflags = GPIOD_OUT_HIGH; 740 else 741 gflags = GPIOD_OUT_LOW; 742 gflags |= GPIOD_FLAGS_BIT_NONEXCLUSIVE; 743 gpiod = devm_gpiod_get_optional(&client->dev, 744 "maxim,enable", 745 gflags); 746 if (IS_ERR(gpiod)) 747 return PTR_ERR(gpiod); 748 if (gpiod) { 749 config.ena_gpiod = gpiod; 750 max->enable_external_control = true; 751 } 752 753 break; 754 755 case MAX77621: 756 /* 757 * We do not let the core switch this regulator on/off, 758 * we just leave it on. 759 */ 760 gpiod = devm_gpiod_get_optional(&client->dev, 761 "maxim,enable", 762 GPIOD_OUT_HIGH); 763 if (IS_ERR(gpiod)) 764 return PTR_ERR(gpiod); 765 if (gpiod) 766 max->enable_external_control = true; 767 768 max->desc.enable_reg = MAX8973_VOUT; 769 max->desc.enable_mask = MAX8973_VOUT_ENABLE; 770 max->ops.enable = regulator_enable_regmap; 771 max->ops.disable = regulator_disable_regmap; 772 max->ops.is_enabled = regulator_is_enabled_regmap; 773 max->ops.set_current_limit = max8973_set_current_limit; 774 max->ops.get_current_limit = max8973_get_current_limit; 775 break; 776 default: 777 break; 778 } 779 780 ret = max8973_init_dcdc(max, pdata); 781 if (ret < 0) { 782 dev_err(max->dev, "Max8973 Init failed, err = %d\n", ret); 783 return ret; 784 } 785 786 config.dev = &client->dev; 787 config.init_data = pdata->reg_init_data; 788 config.driver_data = max; 789 config.of_node = client->dev.of_node; 790 config.regmap = max->regmap; 791 792 /* 793 * Register the regulators 794 * Turn the GPIO descriptor over to the regulator core for 795 * lifecycle management if we pass an ena_gpiod. 796 */ 797 if (config.ena_gpiod) 798 devm_gpiod_unhinge(&client->dev, config.ena_gpiod); 799 rdev = devm_regulator_register(&client->dev, &max->desc, &config); 800 if (IS_ERR(rdev)) { 801 ret = PTR_ERR(rdev); 802 dev_err(max->dev, "regulator register failed, err %d\n", ret); 803 return ret; 804 } 805 806 max8973_thermal_init(max); 807 return 0; 808 } 809 810 static const struct i2c_device_id max8973_id[] = { 811 {.name = "max8973", .driver_data = MAX8973}, 812 {.name = "max77621", .driver_data = MAX77621}, 813 {}, 814 }; 815 MODULE_DEVICE_TABLE(i2c, max8973_id); 816 817 static struct i2c_driver max8973_i2c_driver = { 818 .driver = { 819 .name = "max8973", 820 .of_match_table = of_max8973_match_tbl, 821 }, 822 .probe = max8973_probe, 823 .id_table = max8973_id, 824 }; 825 826 static int __init max8973_init(void) 827 { 828 return i2c_add_driver(&max8973_i2c_driver); 829 } 830 subsys_initcall(max8973_init); 831 832 static void __exit max8973_cleanup(void) 833 { 834 i2c_del_driver(&max8973_i2c_driver); 835 } 836 module_exit(max8973_cleanup); 837 838 MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>"); 839 MODULE_DESCRIPTION("MAX8973 voltage regulator driver"); 840 MODULE_LICENSE("GPL v2"); 841