1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Copyright (C) STMicroelectronics 2018 - All Rights Reserved 4 * Author: David Hernandez Sanchez <david.hernandezsanchez@st.com> for 5 * STMicroelectronics. 6 */ 7 8 #include <linux/clk.h> 9 #include <linux/clk-provider.h> 10 #include <linux/delay.h> 11 #include <linux/err.h> 12 #include <linux/interrupt.h> 13 #include <linux/io.h> 14 #include <linux/iopoll.h> 15 #include <linux/module.h> 16 #include <linux/of.h> 17 #include <linux/of_address.h> 18 #include <linux/of_device.h> 19 #include <linux/platform_device.h> 20 #include <linux/thermal.h> 21 22 #include "../thermal_core.h" 23 #include "../thermal_hwmon.h" 24 25 /* DTS register offsets */ 26 #define DTS_CFGR1_OFFSET 0x0 27 #define DTS_T0VALR1_OFFSET 0x8 28 #define DTS_RAMPVALR_OFFSET 0X10 29 #define DTS_ITR1_OFFSET 0x14 30 #define DTS_DR_OFFSET 0x1C 31 #define DTS_SR_OFFSET 0x20 32 #define DTS_ITENR_OFFSET 0x24 33 #define DTS_CIFR_OFFSET 0x28 34 35 /* DTS_CFGR1 register mask definitions */ 36 #define HSREF_CLK_DIV_MASK GENMASK(30, 24) 37 #define TS1_SMP_TIME_MASK GENMASK(19, 16) 38 #define TS1_INTRIG_SEL_MASK GENMASK(11, 8) 39 40 /* DTS_T0VALR1 register mask definitions */ 41 #define TS1_T0_MASK GENMASK(17, 16) 42 #define TS1_FMT0_MASK GENMASK(15, 0) 43 44 /* DTS_RAMPVALR register mask definitions */ 45 #define TS1_RAMP_COEFF_MASK GENMASK(15, 0) 46 47 /* DTS_ITR1 register mask definitions */ 48 #define TS1_HITTHD_MASK GENMASK(31, 16) 49 #define TS1_LITTHD_MASK GENMASK(15, 0) 50 51 /* DTS_DR register mask definitions */ 52 #define TS1_MFREQ_MASK GENMASK(15, 0) 53 54 /* Less significant bit position definitions */ 55 #define TS1_T0_POS 16 56 #define TS1_SMP_TIME_POS 16 57 #define TS1_HITTHD_POS 16 58 #define HSREF_CLK_DIV_POS 24 59 60 /* DTS_CFGR1 bit definitions */ 61 #define TS1_EN BIT(0) 62 #define TS1_START BIT(4) 63 #define REFCLK_SEL BIT(20) 64 #define REFCLK_LSE REFCLK_SEL 65 #define Q_MEAS_OPT BIT(21) 66 #define CALIBRATION_CONTROL Q_MEAS_OPT 67 68 /* DTS_SR bit definitions */ 69 #define TS_RDY BIT(15) 70 /* Bit definitions below are common for DTS_SR, DTS_ITENR and DTS_CIFR */ 71 #define HIGH_THRESHOLD BIT(2) 72 #define LOW_THRESHOLD BIT(1) 73 74 /* Constants */ 75 #define ADJUST 100 76 #define ONE_MHZ 1000000 77 #define POLL_TIMEOUT 5000 78 #define STARTUP_TIME 40 79 #define TS1_T0_VAL0 30 80 #define TS1_T0_VAL1 130 81 #define NO_HW_TRIG 0 82 83 /* The Thermal Framework expects millidegrees */ 84 #define mcelsius(temp) ((temp) * 1000) 85 86 /* The Sensor expects oC degrees */ 87 #define celsius(temp) ((temp) / 1000) 88 89 struct stm_thermal_sensor { 90 struct device *dev; 91 struct thermal_zone_device *th_dev; 92 enum thermal_device_mode mode; 93 struct clk *clk; 94 int high_temp; 95 int low_temp; 96 int temp_critical; 97 int temp_passive; 98 unsigned int low_temp_enabled; 99 int num_trips; 100 int irq; 101 unsigned int irq_enabled; 102 void __iomem *base; 103 int t0, fmt0, ramp_coeff; 104 }; 105 106 static irqreturn_t stm_thermal_alarm_irq(int irq, void *sdata) 107 { 108 struct stm_thermal_sensor *sensor = sdata; 109 110 disable_irq_nosync(irq); 111 sensor->irq_enabled = false; 112 113 return IRQ_WAKE_THREAD; 114 } 115 116 static irqreturn_t stm_thermal_alarm_irq_thread(int irq, void *sdata) 117 { 118 u32 value; 119 struct stm_thermal_sensor *sensor = sdata; 120 121 /* read IT reason in SR and clear flags */ 122 value = readl_relaxed(sensor->base + DTS_SR_OFFSET); 123 124 if ((value & LOW_THRESHOLD) == LOW_THRESHOLD) 125 writel_relaxed(LOW_THRESHOLD, sensor->base + DTS_CIFR_OFFSET); 126 127 if ((value & HIGH_THRESHOLD) == HIGH_THRESHOLD) 128 writel_relaxed(HIGH_THRESHOLD, sensor->base + DTS_CIFR_OFFSET); 129 130 thermal_zone_device_update(sensor->th_dev, THERMAL_EVENT_UNSPECIFIED); 131 132 return IRQ_HANDLED; 133 } 134 135 static int stm_sensor_power_on(struct stm_thermal_sensor *sensor) 136 { 137 int ret; 138 u32 value; 139 140 /* Enable sensor */ 141 value = readl_relaxed(sensor->base + DTS_CFGR1_OFFSET); 142 value |= TS1_EN; 143 writel_relaxed(value, sensor->base + DTS_CFGR1_OFFSET); 144 145 /* 146 * The DTS block can be enabled by setting TSx_EN bit in 147 * DTS_CFGRx register. It requires a startup time of 148 * 40μs. Use 5 ms as arbitrary timeout. 149 */ 150 ret = readl_poll_timeout(sensor->base + DTS_SR_OFFSET, 151 value, (value & TS_RDY), 152 STARTUP_TIME, POLL_TIMEOUT); 153 if (ret) 154 return ret; 155 156 /* Start continuous measuring */ 157 value = readl_relaxed(sensor->base + 158 DTS_CFGR1_OFFSET); 159 value |= TS1_START; 160 writel_relaxed(value, sensor->base + 161 DTS_CFGR1_OFFSET); 162 163 return 0; 164 } 165 166 static int stm_sensor_power_off(struct stm_thermal_sensor *sensor) 167 { 168 u32 value; 169 170 /* Stop measuring */ 171 value = readl_relaxed(sensor->base + DTS_CFGR1_OFFSET); 172 value &= ~TS1_START; 173 writel_relaxed(value, sensor->base + DTS_CFGR1_OFFSET); 174 175 /* Ensure stop is taken into account */ 176 usleep_range(STARTUP_TIME, POLL_TIMEOUT); 177 178 /* Disable sensor */ 179 value = readl_relaxed(sensor->base + DTS_CFGR1_OFFSET); 180 value &= ~TS1_EN; 181 writel_relaxed(value, sensor->base + DTS_CFGR1_OFFSET); 182 183 /* Ensure disable is taken into account */ 184 return readl_poll_timeout(sensor->base + DTS_SR_OFFSET, value, 185 !(value & TS_RDY), 186 STARTUP_TIME, POLL_TIMEOUT); 187 } 188 189 static int stm_thermal_calibration(struct stm_thermal_sensor *sensor) 190 { 191 u32 value, clk_freq; 192 u32 prescaler; 193 194 /* Figure out prescaler value for PCLK during calibration */ 195 clk_freq = clk_get_rate(sensor->clk); 196 if (!clk_freq) 197 return -EINVAL; 198 199 prescaler = 0; 200 clk_freq /= ONE_MHZ; 201 if (clk_freq) { 202 while (prescaler <= clk_freq) 203 prescaler++; 204 } 205 206 value = readl_relaxed(sensor->base + DTS_CFGR1_OFFSET); 207 208 /* Clear prescaler */ 209 value &= ~HSREF_CLK_DIV_MASK; 210 211 /* Set prescaler. pclk_freq/prescaler < 1MHz */ 212 value |= (prescaler << HSREF_CLK_DIV_POS); 213 214 /* Select PCLK as reference clock */ 215 value &= ~REFCLK_SEL; 216 217 /* Set maximal sampling time for better precision */ 218 value |= TS1_SMP_TIME_MASK; 219 220 /* Measure with calibration */ 221 value &= ~CALIBRATION_CONTROL; 222 223 /* select trigger */ 224 value &= ~TS1_INTRIG_SEL_MASK; 225 value |= NO_HW_TRIG; 226 227 writel_relaxed(value, sensor->base + DTS_CFGR1_OFFSET); 228 229 return 0; 230 } 231 232 /* Fill in DTS structure with factory sensor values */ 233 static int stm_thermal_read_factory_settings(struct stm_thermal_sensor *sensor) 234 { 235 /* Retrieve engineering calibration temperature */ 236 sensor->t0 = readl_relaxed(sensor->base + DTS_T0VALR1_OFFSET) & 237 TS1_T0_MASK; 238 if (!sensor->t0) 239 sensor->t0 = TS1_T0_VAL0; 240 else 241 sensor->t0 = TS1_T0_VAL1; 242 243 /* Retrieve fmt0 and put it on Hz */ 244 sensor->fmt0 = ADJUST * (readl_relaxed(sensor->base + 245 DTS_T0VALR1_OFFSET) & TS1_FMT0_MASK); 246 247 /* Retrieve ramp coefficient */ 248 sensor->ramp_coeff = readl_relaxed(sensor->base + DTS_RAMPVALR_OFFSET) & 249 TS1_RAMP_COEFF_MASK; 250 251 if (!sensor->fmt0 || !sensor->ramp_coeff) { 252 dev_err(sensor->dev, "%s: wrong setting\n", __func__); 253 return -EINVAL; 254 } 255 256 dev_dbg(sensor->dev, "%s: T0 = %doC, FMT0 = %dHz, RAMP_COEFF = %dHz/oC", 257 __func__, sensor->t0, sensor->fmt0, sensor->ramp_coeff); 258 259 return 0; 260 } 261 262 static int stm_thermal_calculate_threshold(struct stm_thermal_sensor *sensor, 263 int temp, u32 *th) 264 { 265 int freqM; 266 u32 sampling_time; 267 268 /* Retrieve the number of periods to sample */ 269 sampling_time = (readl_relaxed(sensor->base + DTS_CFGR1_OFFSET) & 270 TS1_SMP_TIME_MASK) >> TS1_SMP_TIME_POS; 271 272 /* Figure out the CLK_PTAT frequency for a given temperature */ 273 freqM = ((temp - sensor->t0) * sensor->ramp_coeff) 274 + sensor->fmt0; 275 276 dev_dbg(sensor->dev, "%s: freqM for threshold = %d Hz", 277 __func__, freqM); 278 279 /* Figure out the threshold sample number */ 280 *th = clk_get_rate(sensor->clk); 281 if (!*th) 282 return -EINVAL; 283 284 *th = *th / freqM; 285 286 *th *= sampling_time; 287 288 return 0; 289 } 290 291 static int stm_thermal_set_threshold(struct stm_thermal_sensor *sensor) 292 { 293 u32 value, th; 294 int ret; 295 296 value = readl_relaxed(sensor->base + DTS_ITR1_OFFSET); 297 298 /* Erase threshold content */ 299 value &= ~(TS1_LITTHD_MASK | TS1_HITTHD_MASK); 300 301 /* Retrieve the sample threshold number th for a given temperature */ 302 ret = stm_thermal_calculate_threshold(sensor, sensor->high_temp, &th); 303 if (ret) 304 return ret; 305 306 value |= th & TS1_LITTHD_MASK; 307 308 if (sensor->low_temp_enabled) { 309 /* Retrieve the sample threshold */ 310 ret = stm_thermal_calculate_threshold(sensor, sensor->low_temp, 311 &th); 312 if (ret) 313 return ret; 314 315 value |= (TS1_HITTHD_MASK & (th << TS1_HITTHD_POS)); 316 } 317 318 /* Write value on the Low interrupt threshold */ 319 writel_relaxed(value, sensor->base + DTS_ITR1_OFFSET); 320 321 return 0; 322 } 323 324 /* Disable temperature interrupt */ 325 static int stm_disable_irq(struct stm_thermal_sensor *sensor) 326 { 327 u32 value; 328 329 /* Disable IT generation for low and high thresholds */ 330 value = readl_relaxed(sensor->base + DTS_ITENR_OFFSET); 331 writel_relaxed(value & ~(LOW_THRESHOLD | HIGH_THRESHOLD), 332 sensor->base + DTS_ITENR_OFFSET); 333 334 dev_dbg(sensor->dev, "%s: IT disabled on sensor side", __func__); 335 336 return 0; 337 } 338 339 /* Enable temperature interrupt */ 340 static int stm_enable_irq(struct stm_thermal_sensor *sensor) 341 { 342 u32 value; 343 344 /* 345 * Code below enables High temperature threshold using a low threshold 346 * sampling value 347 */ 348 349 /* Make sure LOW_THRESHOLD IT is clear before enabling */ 350 writel_relaxed(LOW_THRESHOLD, sensor->base + DTS_CIFR_OFFSET); 351 352 /* Enable IT generation for low threshold */ 353 value = readl_relaxed(sensor->base + DTS_ITENR_OFFSET); 354 value |= LOW_THRESHOLD; 355 356 /* Enable the low temperature threshold if needed */ 357 if (sensor->low_temp_enabled) { 358 /* Make sure HIGH_THRESHOLD IT is clear before enabling */ 359 writel_relaxed(HIGH_THRESHOLD, sensor->base + DTS_CIFR_OFFSET); 360 361 /* Enable IT generation for high threshold */ 362 value |= HIGH_THRESHOLD; 363 } 364 365 /* Enable thresholds */ 366 writel_relaxed(value, sensor->base + DTS_ITENR_OFFSET); 367 368 dev_dbg(sensor->dev, "%s: IT enabled on sensor side", __func__); 369 370 return 0; 371 } 372 373 static int stm_thermal_update_threshold(struct stm_thermal_sensor *sensor) 374 { 375 int ret; 376 377 sensor->mode = THERMAL_DEVICE_DISABLED; 378 379 ret = stm_sensor_power_off(sensor); 380 if (ret) 381 return ret; 382 383 ret = stm_disable_irq(sensor); 384 if (ret) 385 return ret; 386 387 ret = stm_thermal_set_threshold(sensor); 388 if (ret) 389 return ret; 390 391 ret = stm_enable_irq(sensor); 392 if (ret) 393 return ret; 394 395 ret = stm_sensor_power_on(sensor); 396 if (ret) 397 return ret; 398 399 sensor->mode = THERMAL_DEVICE_ENABLED; 400 401 return 0; 402 } 403 404 /* Callback to get temperature from HW */ 405 static int stm_thermal_get_temp(void *data, int *temp) 406 { 407 struct stm_thermal_sensor *sensor = data; 408 u32 sampling_time; 409 int freqM, ret; 410 411 if (sensor->mode != THERMAL_DEVICE_ENABLED) 412 return -EAGAIN; 413 414 /* Retrieve the number of samples */ 415 ret = readl_poll_timeout(sensor->base + DTS_DR_OFFSET, freqM, 416 (freqM & TS1_MFREQ_MASK), STARTUP_TIME, 417 POLL_TIMEOUT); 418 419 if (ret) 420 return ret; 421 422 if (!freqM) 423 return -ENODATA; 424 425 /* Retrieve the number of periods sampled */ 426 sampling_time = (readl_relaxed(sensor->base + DTS_CFGR1_OFFSET) & 427 TS1_SMP_TIME_MASK) >> TS1_SMP_TIME_POS; 428 429 /* Figure out the number of samples per period */ 430 freqM /= sampling_time; 431 432 /* Figure out the CLK_PTAT frequency */ 433 freqM = clk_get_rate(sensor->clk) / freqM; 434 if (!freqM) 435 return -EINVAL; 436 437 dev_dbg(sensor->dev, "%s: freqM=%d\n", __func__, freqM); 438 439 /* Figure out the temperature in mili celsius */ 440 *temp = mcelsius(sensor->t0 + ((freqM - sensor->fmt0) / 441 sensor->ramp_coeff)); 442 443 dev_dbg(sensor->dev, "%s: temperature = %d millicelsius", 444 __func__, *temp); 445 446 /* Update thresholds */ 447 if (sensor->num_trips > 1) { 448 /* Update alarm threshold value to next higher trip point */ 449 if (sensor->high_temp == sensor->temp_passive && 450 celsius(*temp) >= sensor->temp_passive) { 451 sensor->high_temp = sensor->temp_critical; 452 sensor->low_temp = sensor->temp_passive; 453 sensor->low_temp_enabled = true; 454 ret = stm_thermal_update_threshold(sensor); 455 if (ret) 456 return ret; 457 } 458 459 if (sensor->high_temp == sensor->temp_critical && 460 celsius(*temp) < sensor->temp_passive) { 461 sensor->high_temp = sensor->temp_passive; 462 sensor->low_temp_enabled = false; 463 ret = stm_thermal_update_threshold(sensor); 464 if (ret) 465 return ret; 466 } 467 468 /* 469 * Re-enable alarm IRQ if temperature below critical 470 * temperature 471 */ 472 if (!sensor->irq_enabled && 473 (celsius(*temp) < sensor->temp_critical)) { 474 sensor->irq_enabled = true; 475 enable_irq(sensor->irq); 476 } 477 } 478 479 return 0; 480 } 481 482 /* Registers DTS irq to be visible by GIC */ 483 static int stm_register_irq(struct stm_thermal_sensor *sensor) 484 { 485 struct device *dev = sensor->dev; 486 struct platform_device *pdev = to_platform_device(dev); 487 int ret; 488 489 sensor->irq = platform_get_irq(pdev, 0); 490 if (sensor->irq < 0) { 491 dev_err(dev, "%s: Unable to find IRQ\n", __func__); 492 return sensor->irq; 493 } 494 495 ret = devm_request_threaded_irq(dev, sensor->irq, 496 stm_thermal_alarm_irq, 497 stm_thermal_alarm_irq_thread, 498 IRQF_ONESHOT, 499 dev->driver->name, sensor); 500 if (ret) { 501 dev_err(dev, "%s: Failed to register IRQ %d\n", __func__, 502 sensor->irq); 503 return ret; 504 } 505 506 sensor->irq_enabled = true; 507 508 dev_dbg(dev, "%s: thermal IRQ registered", __func__); 509 510 return 0; 511 } 512 513 static int stm_thermal_sensor_off(struct stm_thermal_sensor *sensor) 514 { 515 int ret; 516 517 ret = stm_sensor_power_off(sensor); 518 if (ret) 519 return ret; 520 521 clk_disable_unprepare(sensor->clk); 522 523 return 0; 524 } 525 526 static int stm_thermal_prepare(struct stm_thermal_sensor *sensor) 527 { 528 int ret; 529 struct device *dev = sensor->dev; 530 531 ret = clk_prepare_enable(sensor->clk); 532 if (ret) 533 return ret; 534 535 ret = stm_thermal_read_factory_settings(sensor); 536 if (ret) 537 goto thermal_unprepare; 538 539 ret = stm_thermal_calibration(sensor); 540 if (ret) 541 goto thermal_unprepare; 542 543 /* Set threshold(s) for IRQ */ 544 ret = stm_thermal_set_threshold(sensor); 545 if (ret) 546 goto thermal_unprepare; 547 548 ret = stm_enable_irq(sensor); 549 if (ret) 550 goto thermal_unprepare; 551 552 ret = stm_sensor_power_on(sensor); 553 if (ret) { 554 dev_err(dev, "%s: failed to power on sensor\n", __func__); 555 goto irq_disable; 556 } 557 558 return 0; 559 560 irq_disable: 561 stm_disable_irq(sensor); 562 563 thermal_unprepare: 564 clk_disable_unprepare(sensor->clk); 565 566 return ret; 567 } 568 569 #ifdef CONFIG_PM_SLEEP 570 static int stm_thermal_suspend(struct device *dev) 571 { 572 int ret; 573 struct stm_thermal_sensor *sensor = dev_get_drvdata(dev); 574 575 ret = stm_thermal_sensor_off(sensor); 576 if (ret) 577 return ret; 578 579 sensor->mode = THERMAL_DEVICE_DISABLED; 580 581 return 0; 582 } 583 584 static int stm_thermal_resume(struct device *dev) 585 { 586 int ret; 587 struct stm_thermal_sensor *sensor = dev_get_drvdata(dev); 588 589 ret = stm_thermal_prepare(sensor); 590 if (ret) 591 return ret; 592 593 sensor->mode = THERMAL_DEVICE_ENABLED; 594 595 return 0; 596 } 597 #endif /* CONFIG_PM_SLEEP */ 598 599 SIMPLE_DEV_PM_OPS(stm_thermal_pm_ops, stm_thermal_suspend, stm_thermal_resume); 600 601 static const struct thermal_zone_of_device_ops stm_tz_ops = { 602 .get_temp = stm_thermal_get_temp, 603 }; 604 605 static const struct of_device_id stm_thermal_of_match[] = { 606 { .compatible = "st,stm32-thermal"}, 607 { /* sentinel */ } 608 }; 609 MODULE_DEVICE_TABLE(of, stm_thermal_of_match); 610 611 static int stm_thermal_probe(struct platform_device *pdev) 612 { 613 struct stm_thermal_sensor *sensor; 614 struct resource *res; 615 const struct thermal_trip *trip; 616 void __iomem *base; 617 int ret, i; 618 619 if (!pdev->dev.of_node) { 620 dev_err(&pdev->dev, "%s: device tree node not found\n", 621 __func__); 622 return -EINVAL; 623 } 624 625 sensor = devm_kzalloc(&pdev->dev, sizeof(*sensor), GFP_KERNEL); 626 if (!sensor) 627 return -ENOMEM; 628 629 platform_set_drvdata(pdev, sensor); 630 631 sensor->dev = &pdev->dev; 632 633 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 634 base = devm_ioremap_resource(&pdev->dev, res); 635 if (IS_ERR(base)) 636 return PTR_ERR(base); 637 638 /* Populate sensor */ 639 sensor->base = base; 640 641 sensor->clk = devm_clk_get(&pdev->dev, "pclk"); 642 if (IS_ERR(sensor->clk)) { 643 dev_err(&pdev->dev, "%s: failed to fetch PCLK clock\n", 644 __func__); 645 return PTR_ERR(sensor->clk); 646 } 647 648 /* Register IRQ into GIC */ 649 ret = stm_register_irq(sensor); 650 if (ret) 651 return ret; 652 653 sensor->th_dev = devm_thermal_zone_of_sensor_register(&pdev->dev, 0, 654 sensor, 655 &stm_tz_ops); 656 657 if (IS_ERR(sensor->th_dev)) { 658 dev_err(&pdev->dev, "%s: thermal zone sensor registering KO\n", 659 __func__); 660 ret = PTR_ERR(sensor->th_dev); 661 return ret; 662 } 663 664 if (!sensor->th_dev->ops->get_crit_temp) { 665 /* Critical point must be provided */ 666 ret = -EINVAL; 667 goto err_tz; 668 } 669 670 ret = sensor->th_dev->ops->get_crit_temp(sensor->th_dev, 671 &sensor->temp_critical); 672 if (ret) { 673 dev_err(&pdev->dev, 674 "Not able to read critical_temp: %d\n", ret); 675 goto err_tz; 676 } 677 678 sensor->temp_critical = celsius(sensor->temp_critical); 679 680 /* Set thresholds for IRQ */ 681 sensor->high_temp = sensor->temp_critical; 682 683 trip = of_thermal_get_trip_points(sensor->th_dev); 684 sensor->num_trips = of_thermal_get_ntrips(sensor->th_dev); 685 686 /* Find out passive temperature if it exists */ 687 for (i = (sensor->num_trips - 1); i >= 0; i--) { 688 if (trip[i].type == THERMAL_TRIP_PASSIVE) { 689 sensor->temp_passive = celsius(trip[i].temperature); 690 /* Update high temperature threshold */ 691 sensor->high_temp = sensor->temp_passive; 692 } 693 } 694 695 /* 696 * Ensure low_temp_enabled flag is disabled. 697 * By disabling low_temp_enabled, low threshold IT will not be 698 * configured neither enabled because it is not needed as high 699 * threshold is set on the lowest temperature trip point after 700 * probe. 701 */ 702 sensor->low_temp_enabled = false; 703 704 /* Configure and enable HW sensor */ 705 ret = stm_thermal_prepare(sensor); 706 if (ret) { 707 dev_err(&pdev->dev, 708 "Not able to enable sensor: %d\n", ret); 709 goto err_tz; 710 } 711 712 /* 713 * Thermal_zone doesn't enable hwmon as default, 714 * enable it here 715 */ 716 sensor->th_dev->tzp->no_hwmon = false; 717 ret = thermal_add_hwmon_sysfs(sensor->th_dev); 718 if (ret) 719 goto err_tz; 720 721 sensor->mode = THERMAL_DEVICE_ENABLED; 722 723 dev_info(&pdev->dev, "%s: Driver initialized successfully\n", 724 __func__); 725 726 return 0; 727 728 err_tz: 729 thermal_zone_of_sensor_unregister(&pdev->dev, sensor->th_dev); 730 return ret; 731 } 732 733 static int stm_thermal_remove(struct platform_device *pdev) 734 { 735 struct stm_thermal_sensor *sensor = platform_get_drvdata(pdev); 736 737 stm_thermal_sensor_off(sensor); 738 thermal_remove_hwmon_sysfs(sensor->th_dev); 739 thermal_zone_of_sensor_unregister(&pdev->dev, sensor->th_dev); 740 741 return 0; 742 } 743 744 static struct platform_driver stm_thermal_driver = { 745 .driver = { 746 .name = "stm_thermal", 747 .pm = &stm_thermal_pm_ops, 748 .of_match_table = stm_thermal_of_match, 749 }, 750 .probe = stm_thermal_probe, 751 .remove = stm_thermal_remove, 752 }; 753 module_platform_driver(stm_thermal_driver); 754 755 MODULE_DESCRIPTION("STMicroelectronics STM32 Thermal Sensor Driver"); 756 MODULE_AUTHOR("David Hernandez Sanchez <david.hernandezsanchez@st.com>"); 757 MODULE_LICENSE("GPL v2"); 758 MODULE_ALIAS("platform:stm_thermal"); 759