1 /* 2 * max8973-regulator.c -- Maxim max8973 3 * 4 * Regulator driver for MAXIM 8973 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/of_gpio.h> 38 #include <linux/i2c.h> 39 #include <linux/slab.h> 40 #include <linux/regmap.h> 41 #include <linux/thermal.h> 42 #include <linux/irq.h> 43 #include <linux/interrupt.h> 44 45 /* Register definitions */ 46 #define MAX8973_VOUT 0x0 47 #define MAX8973_VOUT_DVS 0x1 48 #define MAX8973_CONTROL1 0x2 49 #define MAX8973_CONTROL2 0x3 50 #define MAX8973_CHIPID1 0x4 51 #define MAX8973_CHIPID2 0x5 52 53 #define MAX8973_MAX_VOUT_REG 2 54 55 /* MAX8973_VOUT */ 56 #define MAX8973_VOUT_ENABLE BIT(7) 57 #define MAX8973_VOUT_MASK 0x7F 58 59 /* MAX8973_VOUT_DVS */ 60 #define MAX8973_DVS_VOUT_MASK 0x7F 61 62 /* MAX8973_CONTROL1 */ 63 #define MAX8973_SNS_ENABLE BIT(7) 64 #define MAX8973_FPWM_EN_M BIT(6) 65 #define MAX8973_NFSR_ENABLE BIT(5) 66 #define MAX8973_AD_ENABLE BIT(4) 67 #define MAX8973_BIAS_ENABLE BIT(3) 68 #define MAX8973_FREQSHIFT_9PER BIT(2) 69 70 #define MAX8973_RAMP_12mV_PER_US 0x0 71 #define MAX8973_RAMP_25mV_PER_US 0x1 72 #define MAX8973_RAMP_50mV_PER_US 0x2 73 #define MAX8973_RAMP_200mV_PER_US 0x3 74 #define MAX8973_RAMP_MASK 0x3 75 76 /* MAX8973_CONTROL2 */ 77 #define MAX8973_WDTMR_ENABLE BIT(6) 78 #define MAX8973_DISCH_ENBABLE BIT(5) 79 #define MAX8973_FT_ENABLE BIT(4) 80 #define MAX77621_T_JUNCTION_120 BIT(7) 81 82 #define MAX8973_CKKADV_TRIP_MASK 0xC 83 #define MAX8973_CKKADV_TRIP_DISABLE 0xC 84 #define MAX8973_CKKADV_TRIP_75mV_PER_US 0x0 85 #define MAX8973_CKKADV_TRIP_150mV_PER_US 0x4 86 #define MAX8973_CKKADV_TRIP_75mV_PER_US_HIST_DIS 0x8 87 #define MAX8973_CONTROL_CLKADV_TRIP_MASK 0x00030000 88 89 #define MAX8973_INDUCTOR_MIN_30_PER 0x0 90 #define MAX8973_INDUCTOR_NOMINAL 0x1 91 #define MAX8973_INDUCTOR_PLUS_30_PER 0x2 92 #define MAX8973_INDUCTOR_PLUS_60_PER 0x3 93 #define MAX8973_CONTROL_INDUCTOR_VALUE_MASK 0x00300000 94 95 #define MAX8973_MIN_VOLATGE 606250 96 #define MAX8973_MAX_VOLATGE 1400000 97 #define MAX8973_VOLATGE_STEP 6250 98 #define MAX8973_BUCK_N_VOLTAGE 0x80 99 100 #define MAX77621_CHIPID_TJINT_S BIT(0) 101 102 #define MAX77621_NORMAL_OPERATING_TEMP 100000 103 #define MAX77621_TJINT_WARNING_TEMP_120 120000 104 #define MAX77621_TJINT_WARNING_TEMP_140 140000 105 106 enum device_id { 107 MAX8973, 108 MAX77621 109 }; 110 111 /* Maxim 8973 chip information */ 112 struct max8973_chip { 113 struct device *dev; 114 struct regulator_desc desc; 115 struct regmap *regmap; 116 bool enable_external_control; 117 int enable_gpio; 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_ramp_delay(struct regulator_dev *rdev, 269 int ramp_delay) 270 { 271 struct max8973_chip *max = rdev_get_drvdata(rdev); 272 unsigned int control; 273 int ret; 274 275 /* Set ramp delay */ 276 if (ramp_delay <= 12000) 277 control = MAX8973_RAMP_12mV_PER_US; 278 else if (ramp_delay <= 25000) 279 control = MAX8973_RAMP_25mV_PER_US; 280 else if (ramp_delay <= 50000) 281 control = MAX8973_RAMP_50mV_PER_US; 282 else if (ramp_delay <= 200000) 283 control = MAX8973_RAMP_200mV_PER_US; 284 else 285 return -EINVAL; 286 287 ret = regmap_update_bits(max->regmap, MAX8973_CONTROL1, 288 MAX8973_RAMP_MASK, control); 289 if (ret < 0) 290 dev_err(max->dev, "register %d update failed, %d", 291 MAX8973_CONTROL1, ret); 292 return ret; 293 } 294 295 static int max8973_set_current_limit(struct regulator_dev *rdev, 296 int min_ua, int max_ua) 297 { 298 struct max8973_chip *max = rdev_get_drvdata(rdev); 299 unsigned int val; 300 int ret; 301 302 if (max_ua <= 9000000) 303 val = MAX8973_CKKADV_TRIP_75mV_PER_US; 304 else if (max_ua <= 12000000) 305 val = MAX8973_CKKADV_TRIP_150mV_PER_US; 306 else 307 val = MAX8973_CKKADV_TRIP_DISABLE; 308 309 ret = regmap_update_bits(max->regmap, MAX8973_CONTROL2, 310 MAX8973_CKKADV_TRIP_MASK, val); 311 if (ret < 0) { 312 dev_err(max->dev, "register %d update failed: %d\n", 313 MAX8973_CONTROL2, ret); 314 return ret; 315 } 316 return 0; 317 } 318 319 static int max8973_get_current_limit(struct regulator_dev *rdev) 320 { 321 struct max8973_chip *max = rdev_get_drvdata(rdev); 322 unsigned int control2; 323 int ret; 324 325 ret = regmap_read(max->regmap, MAX8973_CONTROL2, &control2); 326 if (ret < 0) { 327 dev_err(max->dev, "register %d read failed: %d\n", 328 MAX8973_CONTROL2, ret); 329 return ret; 330 } 331 switch (control2 & MAX8973_CKKADV_TRIP_MASK) { 332 case MAX8973_CKKADV_TRIP_DISABLE: 333 return 15000000; 334 case MAX8973_CKKADV_TRIP_150mV_PER_US: 335 return 12000000; 336 case MAX8973_CKKADV_TRIP_75mV_PER_US: 337 return 9000000; 338 default: 339 break; 340 } 341 return 9000000; 342 } 343 344 static const struct regulator_ops max8973_dcdc_ops = { 345 .get_voltage_sel = max8973_dcdc_get_voltage_sel, 346 .set_voltage_sel = max8973_dcdc_set_voltage_sel, 347 .list_voltage = regulator_list_voltage_linear, 348 .set_mode = max8973_dcdc_set_mode, 349 .get_mode = max8973_dcdc_get_mode, 350 .set_voltage_time_sel = regulator_set_voltage_time_sel, 351 .set_ramp_delay = max8973_set_ramp_delay, 352 }; 353 354 static int max8973_init_dcdc(struct max8973_chip *max, 355 struct max8973_regulator_platform_data *pdata) 356 { 357 int ret; 358 uint8_t control1 = 0; 359 uint8_t control2 = 0; 360 unsigned int data; 361 362 ret = regmap_read(max->regmap, MAX8973_CONTROL1, &data); 363 if (ret < 0) { 364 dev_err(max->dev, "register %d read failed, err = %d", 365 MAX8973_CONTROL1, ret); 366 return ret; 367 } 368 control1 = data & MAX8973_RAMP_MASK; 369 switch (control1) { 370 case MAX8973_RAMP_12mV_PER_US: 371 max->desc.ramp_delay = 12000; 372 break; 373 case MAX8973_RAMP_25mV_PER_US: 374 max->desc.ramp_delay = 25000; 375 break; 376 case MAX8973_RAMP_50mV_PER_US: 377 max->desc.ramp_delay = 50000; 378 break; 379 case MAX8973_RAMP_200mV_PER_US: 380 max->desc.ramp_delay = 200000; 381 break; 382 } 383 384 if (pdata->control_flags & MAX8973_CONTROL_REMOTE_SENSE_ENABLE) 385 control1 |= MAX8973_SNS_ENABLE; 386 387 if (!(pdata->control_flags & MAX8973_CONTROL_FALLING_SLEW_RATE_ENABLE)) 388 control1 |= MAX8973_NFSR_ENABLE; 389 390 if (pdata->control_flags & MAX8973_CONTROL_OUTPUT_ACTIVE_DISCH_ENABLE) 391 control1 |= MAX8973_AD_ENABLE; 392 393 if (pdata->control_flags & MAX8973_CONTROL_BIAS_ENABLE) { 394 control1 |= MAX8973_BIAS_ENABLE; 395 max->desc.enable_time = 20; 396 } else { 397 max->desc.enable_time = 240; 398 } 399 400 if (pdata->control_flags & MAX8973_CONTROL_FREQ_SHIFT_9PER_ENABLE) 401 control1 |= MAX8973_FREQSHIFT_9PER; 402 403 if ((pdata->junction_temp_warning == MAX77621_TJINT_WARNING_TEMP_120) && 404 (max->id == MAX77621)) 405 control2 |= MAX77621_T_JUNCTION_120; 406 407 if (!(pdata->control_flags & MAX8973_CONTROL_PULL_DOWN_ENABLE)) 408 control2 |= MAX8973_DISCH_ENBABLE; 409 410 /* Clock advance trip configuration */ 411 switch (pdata->control_flags & MAX8973_CONTROL_CLKADV_TRIP_MASK) { 412 case MAX8973_CONTROL_CLKADV_TRIP_DISABLED: 413 control2 |= MAX8973_CKKADV_TRIP_DISABLE; 414 break; 415 416 case MAX8973_CONTROL_CLKADV_TRIP_75mV_PER_US: 417 control2 |= MAX8973_CKKADV_TRIP_75mV_PER_US; 418 break; 419 420 case MAX8973_CONTROL_CLKADV_TRIP_150mV_PER_US: 421 control2 |= MAX8973_CKKADV_TRIP_150mV_PER_US; 422 break; 423 424 case MAX8973_CONTROL_CLKADV_TRIP_75mV_PER_US_HIST_DIS: 425 control2 |= MAX8973_CKKADV_TRIP_75mV_PER_US_HIST_DIS; 426 break; 427 } 428 429 /* Configure inductor value */ 430 switch (pdata->control_flags & MAX8973_CONTROL_INDUCTOR_VALUE_MASK) { 431 case MAX8973_CONTROL_INDUCTOR_VALUE_NOMINAL: 432 control2 |= MAX8973_INDUCTOR_NOMINAL; 433 break; 434 435 case MAX8973_CONTROL_INDUCTOR_VALUE_MINUS_30_PER: 436 control2 |= MAX8973_INDUCTOR_MIN_30_PER; 437 break; 438 439 case MAX8973_CONTROL_INDUCTOR_VALUE_PLUS_30_PER: 440 control2 |= MAX8973_INDUCTOR_PLUS_30_PER; 441 break; 442 443 case MAX8973_CONTROL_INDUCTOR_VALUE_PLUS_60_PER: 444 control2 |= MAX8973_INDUCTOR_PLUS_60_PER; 445 break; 446 } 447 448 ret = regmap_write(max->regmap, MAX8973_CONTROL1, control1); 449 if (ret < 0) { 450 dev_err(max->dev, "register %d write failed, err = %d", 451 MAX8973_CONTROL1, ret); 452 return ret; 453 } 454 455 ret = regmap_write(max->regmap, MAX8973_CONTROL2, control2); 456 if (ret < 0) { 457 dev_err(max->dev, "register %d write failed, err = %d", 458 MAX8973_CONTROL2, ret); 459 return ret; 460 } 461 462 /* If external control is enabled then disable EN bit */ 463 if (max->enable_external_control && (max->id == MAX8973)) { 464 ret = regmap_update_bits(max->regmap, MAX8973_VOUT, 465 MAX8973_VOUT_ENABLE, 0); 466 if (ret < 0) 467 dev_err(max->dev, "register %d update failed, err = %d", 468 MAX8973_VOUT, ret); 469 } 470 return ret; 471 } 472 473 static int max8973_thermal_read_temp(void *data, int *temp) 474 { 475 struct max8973_chip *mchip = data; 476 unsigned int val; 477 int ret; 478 479 ret = regmap_read(mchip->regmap, MAX8973_CHIPID1, &val); 480 if (ret < 0) { 481 dev_err(mchip->dev, "Failed to read register CHIPID1, %d", ret); 482 return ret; 483 } 484 485 /* +1 degC to trigger cool devive */ 486 if (val & MAX77621_CHIPID_TJINT_S) 487 *temp = mchip->junction_temp_warning + 1000; 488 else 489 *temp = MAX77621_NORMAL_OPERATING_TEMP; 490 491 return 0; 492 } 493 494 static irqreturn_t max8973_thermal_irq(int irq, void *data) 495 { 496 struct max8973_chip *mchip = data; 497 498 thermal_zone_device_update(mchip->tz_device, 499 THERMAL_EVENT_UNSPECIFIED); 500 501 return IRQ_HANDLED; 502 } 503 504 static const struct thermal_zone_of_device_ops max77621_tz_ops = { 505 .get_temp = max8973_thermal_read_temp, 506 }; 507 508 static int max8973_thermal_init(struct max8973_chip *mchip) 509 { 510 struct thermal_zone_device *tzd; 511 struct irq_data *irq_data; 512 unsigned long irq_flags = 0; 513 int ret; 514 515 if (mchip->id != MAX77621) 516 return 0; 517 518 tzd = devm_thermal_zone_of_sensor_register(mchip->dev, 0, mchip, 519 &max77621_tz_ops); 520 if (IS_ERR(tzd)) { 521 ret = PTR_ERR(tzd); 522 dev_err(mchip->dev, "Failed to register thermal sensor: %d\n", 523 ret); 524 return ret; 525 } 526 527 if (mchip->irq <= 0) 528 return 0; 529 530 irq_data = irq_get_irq_data(mchip->irq); 531 if (irq_data) 532 irq_flags = irqd_get_trigger_type(irq_data); 533 534 ret = devm_request_threaded_irq(mchip->dev, mchip->irq, NULL, 535 max8973_thermal_irq, 536 IRQF_ONESHOT | IRQF_SHARED | irq_flags, 537 dev_name(mchip->dev), mchip); 538 if (ret < 0) { 539 dev_err(mchip->dev, "Failed to request irq %d, %d\n", 540 mchip->irq, ret); 541 return ret; 542 } 543 544 return 0; 545 } 546 547 static const struct regmap_config max8973_regmap_config = { 548 .reg_bits = 8, 549 .val_bits = 8, 550 .max_register = MAX8973_CHIPID2, 551 .cache_type = REGCACHE_RBTREE, 552 }; 553 554 static struct max8973_regulator_platform_data *max8973_parse_dt( 555 struct device *dev) 556 { 557 struct max8973_regulator_platform_data *pdata; 558 struct device_node *np = dev->of_node; 559 int ret; 560 u32 pval; 561 bool etr_enable; 562 bool etr_sensitivity_high; 563 564 pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL); 565 if (!pdata) 566 return NULL; 567 568 pdata->enable_ext_control = of_property_read_bool(np, 569 "maxim,externally-enable"); 570 pdata->enable_gpio = of_get_named_gpio(np, "maxim,enable-gpio", 0); 571 pdata->dvs_gpio = of_get_named_gpio(np, "maxim,dvs-gpio", 0); 572 573 ret = of_property_read_u32(np, "maxim,dvs-default-state", &pval); 574 if (!ret) 575 pdata->dvs_def_state = pval; 576 577 if (of_property_read_bool(np, "maxim,enable-remote-sense")) 578 pdata->control_flags |= MAX8973_CONTROL_REMOTE_SENSE_ENABLE; 579 580 if (of_property_read_bool(np, "maxim,enable-falling-slew-rate")) 581 pdata->control_flags |= 582 MAX8973_CONTROL_FALLING_SLEW_RATE_ENABLE; 583 584 if (of_property_read_bool(np, "maxim,enable-active-discharge")) 585 pdata->control_flags |= 586 MAX8973_CONTROL_OUTPUT_ACTIVE_DISCH_ENABLE; 587 588 if (of_property_read_bool(np, "maxim,enable-frequency-shift")) 589 pdata->control_flags |= MAX8973_CONTROL_FREQ_SHIFT_9PER_ENABLE; 590 591 if (of_property_read_bool(np, "maxim,enable-bias-control")) 592 pdata->control_flags |= MAX8973_CONTROL_BIAS_ENABLE; 593 594 etr_enable = of_property_read_bool(np, "maxim,enable-etr"); 595 etr_sensitivity_high = of_property_read_bool(np, 596 "maxim,enable-high-etr-sensitivity"); 597 if (etr_sensitivity_high) 598 etr_enable = true; 599 600 if (etr_enable) { 601 if (etr_sensitivity_high) 602 pdata->control_flags |= 603 MAX8973_CONTROL_CLKADV_TRIP_75mV_PER_US; 604 else 605 pdata->control_flags |= 606 MAX8973_CONTROL_CLKADV_TRIP_150mV_PER_US; 607 } else { 608 pdata->control_flags |= MAX8973_CONTROL_CLKADV_TRIP_DISABLED; 609 } 610 611 pdata->junction_temp_warning = MAX77621_TJINT_WARNING_TEMP_140; 612 ret = of_property_read_u32(np, "junction-warn-millicelsius", &pval); 613 if (!ret && (pval <= MAX77621_TJINT_WARNING_TEMP_120)) 614 pdata->junction_temp_warning = MAX77621_TJINT_WARNING_TEMP_120; 615 616 return pdata; 617 } 618 619 static const struct of_device_id of_max8973_match_tbl[] = { 620 { .compatible = "maxim,max8973", .data = (void *)MAX8973, }, 621 { .compatible = "maxim,max77621", .data = (void *)MAX77621, }, 622 { }, 623 }; 624 MODULE_DEVICE_TABLE(of, of_max8973_match_tbl); 625 626 static int max8973_probe(struct i2c_client *client, 627 const struct i2c_device_id *id) 628 { 629 struct max8973_regulator_platform_data *pdata; 630 struct regulator_init_data *ridata; 631 struct regulator_config config = { }; 632 struct regulator_dev *rdev; 633 struct max8973_chip *max; 634 bool pdata_from_dt = false; 635 unsigned int chip_id; 636 int ret; 637 638 pdata = dev_get_platdata(&client->dev); 639 640 if (!pdata && client->dev.of_node) { 641 pdata = max8973_parse_dt(&client->dev); 642 pdata_from_dt = true; 643 } 644 645 if (!pdata) { 646 dev_err(&client->dev, "No Platform data"); 647 return -EIO; 648 } 649 650 if ((pdata->dvs_gpio == -EPROBE_DEFER) || 651 (pdata->enable_gpio == -EPROBE_DEFER)) 652 return -EPROBE_DEFER; 653 654 max = devm_kzalloc(&client->dev, sizeof(*max), GFP_KERNEL); 655 if (!max) 656 return -ENOMEM; 657 658 max->regmap = devm_regmap_init_i2c(client, &max8973_regmap_config); 659 if (IS_ERR(max->regmap)) { 660 ret = PTR_ERR(max->regmap); 661 dev_err(&client->dev, "regmap init failed, err %d\n", ret); 662 return ret; 663 } 664 665 if (client->dev.of_node) { 666 const struct of_device_id *match; 667 668 match = of_match_device(of_match_ptr(of_max8973_match_tbl), 669 &client->dev); 670 if (!match) 671 return -ENODATA; 672 max->id = (u32)((uintptr_t)match->data); 673 } else { 674 max->id = id->driver_data; 675 } 676 677 ret = regmap_read(max->regmap, MAX8973_CHIPID1, &chip_id); 678 if (ret < 0) { 679 dev_err(&client->dev, "register CHIPID1 read failed, %d", ret); 680 return ret; 681 } 682 683 dev_info(&client->dev, "CHIP-ID OTP: 0x%02x ID_M: 0x%02x\n", 684 (chip_id >> 4) & 0xF, (chip_id >> 1) & 0x7); 685 686 i2c_set_clientdata(client, max); 687 max->ops = max8973_dcdc_ops; 688 max->dev = &client->dev; 689 max->desc.name = id->name; 690 max->desc.id = 0; 691 max->desc.ops = &max->ops; 692 max->desc.type = REGULATOR_VOLTAGE; 693 max->desc.owner = THIS_MODULE; 694 max->desc.min_uV = MAX8973_MIN_VOLATGE; 695 max->desc.uV_step = MAX8973_VOLATGE_STEP; 696 max->desc.n_voltages = MAX8973_BUCK_N_VOLTAGE; 697 698 max->dvs_gpio = (pdata->dvs_gpio) ? pdata->dvs_gpio : -EINVAL; 699 max->enable_gpio = (pdata->enable_gpio) ? pdata->enable_gpio : -EINVAL; 700 max->enable_external_control = pdata->enable_ext_control; 701 max->curr_gpio_val = pdata->dvs_def_state; 702 max->curr_vout_reg = MAX8973_VOUT + pdata->dvs_def_state; 703 max->junction_temp_warning = pdata->junction_temp_warning; 704 705 if (gpio_is_valid(max->enable_gpio)) 706 max->enable_external_control = true; 707 708 max->lru_index[0] = max->curr_vout_reg; 709 710 if (gpio_is_valid(max->dvs_gpio)) { 711 int gpio_flags; 712 int i; 713 714 gpio_flags = (pdata->dvs_def_state) ? 715 GPIOF_OUT_INIT_HIGH : GPIOF_OUT_INIT_LOW; 716 ret = devm_gpio_request_one(&client->dev, max->dvs_gpio, 717 gpio_flags, "max8973-dvs"); 718 if (ret) { 719 dev_err(&client->dev, 720 "gpio_request for gpio %d failed, err = %d\n", 721 max->dvs_gpio, ret); 722 return ret; 723 } 724 725 /* 726 * Initialize the lru index with vout_reg id 727 * The index 0 will be most recently used and 728 * set with the max->curr_vout_reg */ 729 for (i = 0; i < MAX8973_MAX_VOUT_REG; ++i) 730 max->lru_index[i] = i; 731 max->lru_index[0] = max->curr_vout_reg; 732 max->lru_index[max->curr_vout_reg] = 0; 733 } else { 734 /* 735 * If there is no DVS GPIO, the VOUT register 736 * address is fixed. 737 */ 738 max->ops.set_voltage_sel = regulator_set_voltage_sel_regmap; 739 max->ops.get_voltage_sel = regulator_get_voltage_sel_regmap; 740 max->desc.vsel_reg = max->curr_vout_reg; 741 max->desc.vsel_mask = MAX8973_VOUT_MASK; 742 } 743 744 if (pdata_from_dt) 745 pdata->reg_init_data = of_get_regulator_init_data(&client->dev, 746 client->dev.of_node, &max->desc); 747 748 ridata = pdata->reg_init_data; 749 switch (max->id) { 750 case MAX8973: 751 if (!pdata->enable_ext_control) { 752 max->desc.enable_reg = MAX8973_VOUT; 753 max->desc.enable_mask = MAX8973_VOUT_ENABLE; 754 max->ops.enable = regulator_enable_regmap; 755 max->ops.disable = regulator_disable_regmap; 756 max->ops.is_enabled = regulator_is_enabled_regmap; 757 break; 758 } 759 760 if (gpio_is_valid(max->enable_gpio)) { 761 config.ena_gpio_flags = GPIOF_OUT_INIT_LOW; 762 if (ridata && (ridata->constraints.always_on || 763 ridata->constraints.boot_on)) 764 config.ena_gpio_flags = GPIOF_OUT_INIT_HIGH; 765 config.ena_gpio = max->enable_gpio; 766 } 767 break; 768 769 case MAX77621: 770 if (gpio_is_valid(max->enable_gpio)) { 771 ret = devm_gpio_request_one(&client->dev, 772 max->enable_gpio, GPIOF_OUT_INIT_HIGH, 773 "max8973-en-gpio"); 774 if (ret) { 775 dev_err(&client->dev, 776 "gpio_request for gpio %d failed: %d\n", 777 max->enable_gpio, ret); 778 return ret; 779 } 780 } 781 782 max->desc.enable_reg = MAX8973_VOUT; 783 max->desc.enable_mask = MAX8973_VOUT_ENABLE; 784 max->ops.enable = regulator_enable_regmap; 785 max->ops.disable = regulator_disable_regmap; 786 max->ops.is_enabled = regulator_is_enabled_regmap; 787 max->ops.set_current_limit = max8973_set_current_limit; 788 max->ops.get_current_limit = max8973_get_current_limit; 789 break; 790 default: 791 break; 792 } 793 794 ret = max8973_init_dcdc(max, pdata); 795 if (ret < 0) { 796 dev_err(max->dev, "Max8973 Init failed, err = %d\n", ret); 797 return ret; 798 } 799 800 config.dev = &client->dev; 801 config.init_data = pdata->reg_init_data; 802 config.driver_data = max; 803 config.of_node = client->dev.of_node; 804 config.regmap = max->regmap; 805 806 /* Register the regulators */ 807 rdev = devm_regulator_register(&client->dev, &max->desc, &config); 808 if (IS_ERR(rdev)) { 809 ret = PTR_ERR(rdev); 810 dev_err(max->dev, "regulator register failed, err %d\n", ret); 811 return ret; 812 } 813 814 max8973_thermal_init(max); 815 return 0; 816 } 817 818 static const struct i2c_device_id max8973_id[] = { 819 {.name = "max8973", .driver_data = MAX8973}, 820 {.name = "max77621", .driver_data = MAX77621}, 821 {}, 822 }; 823 MODULE_DEVICE_TABLE(i2c, max8973_id); 824 825 static struct i2c_driver max8973_i2c_driver = { 826 .driver = { 827 .name = "max8973", 828 .of_match_table = of_max8973_match_tbl, 829 }, 830 .probe = max8973_probe, 831 .id_table = max8973_id, 832 }; 833 834 static int __init max8973_init(void) 835 { 836 return i2c_add_driver(&max8973_i2c_driver); 837 } 838 subsys_initcall(max8973_init); 839 840 static void __exit max8973_cleanup(void) 841 { 842 i2c_del_driver(&max8973_i2c_driver); 843 } 844 module_exit(max8973_cleanup); 845 846 MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>"); 847 MODULE_DESCRIPTION("MAX8973 voltage regulator driver"); 848 MODULE_LICENSE("GPL v2"); 849