1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Tegra30 SoC Thermal Sensor driver 4 * 5 * Based on downstream HWMON driver from NVIDIA. 6 * Copyright (C) 2011 NVIDIA Corporation 7 * 8 * Author: Dmitry Osipenko <digetx@gmail.com> 9 * Copyright (C) 2021 GRATE-DRIVER project 10 */ 11 12 #include <linux/bitfield.h> 13 #include <linux/clk.h> 14 #include <linux/delay.h> 15 #include <linux/errno.h> 16 #include <linux/interrupt.h> 17 #include <linux/io.h> 18 #include <linux/iopoll.h> 19 #include <linux/math.h> 20 #include <linux/module.h> 21 #include <linux/of_device.h> 22 #include <linux/platform_device.h> 23 #include <linux/pm.h> 24 #include <linux/reset.h> 25 #include <linux/slab.h> 26 #include <linux/thermal.h> 27 #include <linux/types.h> 28 29 #include <soc/tegra/fuse.h> 30 31 #include "../thermal_hwmon.h" 32 33 #define TSENSOR_SENSOR0_CONFIG0 0x0 34 #define TSENSOR_SENSOR0_CONFIG0_SENSOR_STOP BIT(0) 35 #define TSENSOR_SENSOR0_CONFIG0_HW_FREQ_DIV_EN BIT(1) 36 #define TSENSOR_SENSOR0_CONFIG0_THERMAL_RST_EN BIT(2) 37 #define TSENSOR_SENSOR0_CONFIG0_DVFS_EN BIT(3) 38 #define TSENSOR_SENSOR0_CONFIG0_INTR_OVERFLOW_EN BIT(4) 39 #define TSENSOR_SENSOR0_CONFIG0_INTR_HW_FREQ_DIV_EN BIT(5) 40 #define TSENSOR_SENSOR0_CONFIG0_INTR_THERMAL_RST_EN BIT(6) 41 #define TSENSOR_SENSOR0_CONFIG0_M GENMASK(23, 8) 42 #define TSENSOR_SENSOR0_CONFIG0_N GENMASK(31, 24) 43 44 #define TSENSOR_SENSOR0_CONFIG1 0x8 45 #define TSENSOR_SENSOR0_CONFIG1_TH1 GENMASK(15, 0) 46 #define TSENSOR_SENSOR0_CONFIG1_TH2 GENMASK(31, 16) 47 48 #define TSENSOR_SENSOR0_CONFIG2 0xc 49 #define TSENSOR_SENSOR0_CONFIG2_TH3 GENMASK(15, 0) 50 51 #define TSENSOR_SENSOR0_STATUS0 0x18 52 #define TSENSOR_SENSOR0_STATUS0_STATE GENMASK(2, 0) 53 #define TSENSOR_SENSOR0_STATUS0_INTR BIT(8) 54 #define TSENSOR_SENSOR0_STATUS0_CURRENT_VALID BIT(9) 55 56 #define TSENSOR_SENSOR0_TS_STATUS1 0x1c 57 #define TSENSOR_SENSOR0_TS_STATUS1_CURRENT_COUNT GENMASK(31, 16) 58 59 #define TEGRA30_FUSE_TEST_PROG_VER 0x28 60 61 #define TEGRA30_FUSE_TSENSOR_CALIB 0x98 62 #define TEGRA30_FUSE_TSENSOR_CALIB_LOW GENMASK(15, 0) 63 #define TEGRA30_FUSE_TSENSOR_CALIB_HIGH GENMASK(31, 16) 64 65 #define TEGRA30_FUSE_SPARE_BIT 0x144 66 67 struct tegra_tsensor; 68 69 struct tegra_tsensor_calibration_data { 70 int a, b, m, n, p, r; 71 }; 72 73 struct tegra_tsensor_channel { 74 void __iomem *regs; 75 unsigned int id; 76 struct tegra_tsensor *ts; 77 struct thermal_zone_device *tzd; 78 }; 79 80 struct tegra_tsensor { 81 void __iomem *regs; 82 bool swap_channels; 83 struct clk *clk; 84 struct device *dev; 85 struct reset_control *rst; 86 struct tegra_tsensor_channel ch[2]; 87 struct tegra_tsensor_calibration_data calib; 88 }; 89 90 static int tegra_tsensor_hw_enable(const struct tegra_tsensor *ts) 91 { 92 u32 val; 93 int err; 94 95 err = reset_control_assert(ts->rst); 96 if (err) { 97 dev_err(ts->dev, "failed to assert hardware reset: %d\n", err); 98 return err; 99 } 100 101 err = clk_prepare_enable(ts->clk); 102 if (err) { 103 dev_err(ts->dev, "failed to enable clock: %d\n", err); 104 return err; 105 } 106 107 fsleep(1000); 108 109 err = reset_control_deassert(ts->rst); 110 if (err) { 111 dev_err(ts->dev, "failed to deassert hardware reset: %d\n", err); 112 goto disable_clk; 113 } 114 115 /* 116 * Sensors are enabled after reset by default, but not gauging 117 * until clock counter is programmed. 118 * 119 * M: number of reference clock pulses after which every 120 * temperature / voltage measurement is made 121 * 122 * N: number of reference clock counts for which the counter runs 123 */ 124 val = FIELD_PREP(TSENSOR_SENSOR0_CONFIG0_M, 12500); 125 val |= FIELD_PREP(TSENSOR_SENSOR0_CONFIG0_N, 255); 126 127 /* apply the same configuration to both channels */ 128 writel_relaxed(val, ts->regs + 0x40 + TSENSOR_SENSOR0_CONFIG0); 129 writel_relaxed(val, ts->regs + 0x80 + TSENSOR_SENSOR0_CONFIG0); 130 131 return 0; 132 133 disable_clk: 134 clk_disable_unprepare(ts->clk); 135 136 return err; 137 } 138 139 static int tegra_tsensor_hw_disable(const struct tegra_tsensor *ts) 140 { 141 int err; 142 143 err = reset_control_assert(ts->rst); 144 if (err) { 145 dev_err(ts->dev, "failed to assert hardware reset: %d\n", err); 146 return err; 147 } 148 149 clk_disable_unprepare(ts->clk); 150 151 return 0; 152 } 153 154 static void devm_tegra_tsensor_hw_disable(void *data) 155 { 156 const struct tegra_tsensor *ts = data; 157 158 tegra_tsensor_hw_disable(ts); 159 } 160 161 static int tegra_tsensor_get_temp(struct thermal_zone_device *tz, int *temp) 162 { 163 const struct tegra_tsensor_channel *tsc = thermal_zone_device_priv(tz); 164 const struct tegra_tsensor *ts = tsc->ts; 165 int err, c1, c2, c3, c4, counter; 166 u32 val; 167 168 /* 169 * Counter will be invalid if hardware is misprogrammed or not enough 170 * time passed since the time when sensor was enabled. 171 */ 172 err = readl_relaxed_poll_timeout(tsc->regs + TSENSOR_SENSOR0_STATUS0, val, 173 val & TSENSOR_SENSOR0_STATUS0_CURRENT_VALID, 174 21 * USEC_PER_MSEC, 175 21 * USEC_PER_MSEC * 50); 176 if (err) { 177 dev_err_once(ts->dev, "ch%u: counter invalid\n", tsc->id); 178 return err; 179 } 180 181 val = readl_relaxed(tsc->regs + TSENSOR_SENSOR0_TS_STATUS1); 182 counter = FIELD_GET(TSENSOR_SENSOR0_TS_STATUS1_CURRENT_COUNT, val); 183 184 /* 185 * This shouldn't happen with a valid counter status, nevertheless 186 * lets verify the value since it's in a separate (from status) 187 * register. 188 */ 189 if (counter == 0xffff) { 190 dev_err_once(ts->dev, "ch%u: counter overflow\n", tsc->id); 191 return -EINVAL; 192 } 193 194 /* 195 * temperature = a * counter + b 196 * temperature = m * (temperature ^ 2) + n * temperature + p 197 */ 198 c1 = DIV_ROUND_CLOSEST(ts->calib.a * counter + ts->calib.b, 1000000); 199 c1 = c1 ?: 1; 200 c2 = DIV_ROUND_CLOSEST(ts->calib.p, c1); 201 c3 = c1 * ts->calib.m; 202 c4 = ts->calib.n; 203 204 *temp = DIV_ROUND_CLOSEST(c1 * (c2 + c3 + c4), 1000); 205 206 return 0; 207 } 208 209 static int tegra_tsensor_temp_to_counter(const struct tegra_tsensor *ts, int temp) 210 { 211 int c1, c2; 212 213 c1 = DIV_ROUND_CLOSEST(ts->calib.p - temp * 1000, ts->calib.m); 214 c2 = -ts->calib.r - int_sqrt(ts->calib.r * ts->calib.r - c1); 215 216 return DIV_ROUND_CLOSEST(c2 * 1000000 - ts->calib.b, ts->calib.a); 217 } 218 219 static int tegra_tsensor_set_trips(struct thermal_zone_device *tz, int low, int high) 220 { 221 const struct tegra_tsensor_channel *tsc = thermal_zone_device_priv(tz); 222 const struct tegra_tsensor *ts = tsc->ts; 223 u32 val; 224 225 /* 226 * TSENSOR doesn't trigger interrupt on the "low" temperature breach, 227 * hence bail out if high temperature is unspecified. 228 */ 229 if (high == INT_MAX) 230 return 0; 231 232 val = readl_relaxed(tsc->regs + TSENSOR_SENSOR0_CONFIG1); 233 val &= ~TSENSOR_SENSOR0_CONFIG1_TH1; 234 235 high = tegra_tsensor_temp_to_counter(ts, high); 236 val |= FIELD_PREP(TSENSOR_SENSOR0_CONFIG1_TH1, high); 237 writel_relaxed(val, tsc->regs + TSENSOR_SENSOR0_CONFIG1); 238 239 return 0; 240 } 241 242 static const struct thermal_zone_device_ops ops = { 243 .get_temp = tegra_tsensor_get_temp, 244 .set_trips = tegra_tsensor_set_trips, 245 }; 246 247 static bool 248 tegra_tsensor_handle_channel_interrupt(const struct tegra_tsensor *ts, 249 unsigned int id) 250 { 251 const struct tegra_tsensor_channel *tsc = &ts->ch[id]; 252 u32 val; 253 254 val = readl_relaxed(tsc->regs + TSENSOR_SENSOR0_STATUS0); 255 writel_relaxed(val, tsc->regs + TSENSOR_SENSOR0_STATUS0); 256 257 if (FIELD_GET(TSENSOR_SENSOR0_STATUS0_STATE, val) == 5) 258 dev_err_ratelimited(ts->dev, "ch%u: counter overflowed\n", id); 259 260 if (!FIELD_GET(TSENSOR_SENSOR0_STATUS0_INTR, val)) 261 return false; 262 263 thermal_zone_device_update(tsc->tzd, THERMAL_EVENT_UNSPECIFIED); 264 265 return true; 266 } 267 268 static irqreturn_t tegra_tsensor_isr(int irq, void *data) 269 { 270 const struct tegra_tsensor *ts = data; 271 bool handled = false; 272 unsigned int i; 273 274 for (i = 0; i < ARRAY_SIZE(ts->ch); i++) 275 handled |= tegra_tsensor_handle_channel_interrupt(ts, i); 276 277 return handled ? IRQ_HANDLED : IRQ_NONE; 278 } 279 280 static int tegra_tsensor_disable_hw_channel(const struct tegra_tsensor *ts, 281 unsigned int id) 282 { 283 const struct tegra_tsensor_channel *tsc = &ts->ch[id]; 284 struct thermal_zone_device *tzd = tsc->tzd; 285 u32 val; 286 int err; 287 288 if (!tzd) 289 goto stop_channel; 290 291 err = thermal_zone_device_disable(tzd); 292 if (err) { 293 dev_err(ts->dev, "ch%u: failed to disable zone: %d\n", id, err); 294 return err; 295 } 296 297 stop_channel: 298 /* stop channel gracefully */ 299 val = readl_relaxed(tsc->regs + TSENSOR_SENSOR0_CONFIG0); 300 val |= FIELD_PREP(TSENSOR_SENSOR0_CONFIG0_SENSOR_STOP, 1); 301 writel_relaxed(val, tsc->regs + TSENSOR_SENSOR0_CONFIG0); 302 303 return 0; 304 } 305 306 static void tegra_tsensor_get_hw_channel_trips(struct thermal_zone_device *tzd, 307 int *hot_trip, int *crit_trip) 308 { 309 unsigned int i; 310 311 /* 312 * 90C is the maximal critical temperature of all Tegra30 SoC variants, 313 * use it for the default trip if unspecified in a device-tree. 314 */ 315 *hot_trip = 85000; 316 *crit_trip = 90000; 317 318 for (i = 0; i < thermal_zone_get_num_trips(tzd); i++) { 319 320 struct thermal_trip trip; 321 322 thermal_zone_get_trip(tzd, i, &trip); 323 324 if (trip.type == THERMAL_TRIP_HOT) 325 *hot_trip = trip.temperature; 326 327 if (trip.type == THERMAL_TRIP_CRITICAL) 328 *crit_trip = trip.temperature; 329 } 330 331 /* clamp hardware trips to the calibration limits */ 332 *hot_trip = clamp(*hot_trip, 25000, 90000); 333 334 /* 335 * Kernel will perform a normal system shut down if it will 336 * see that critical temperature is breached, hence set the 337 * hardware limit by 5C higher in order to allow system to 338 * shut down gracefully before sending signal to the Power 339 * Management controller. 340 */ 341 *crit_trip = clamp(*crit_trip + 5000, 25000, 90000); 342 } 343 344 static int tegra_tsensor_enable_hw_channel(const struct tegra_tsensor *ts, 345 unsigned int id) 346 { 347 const struct tegra_tsensor_channel *tsc = &ts->ch[id]; 348 struct thermal_zone_device *tzd = tsc->tzd; 349 int err, hot_trip = 0, crit_trip = 0; 350 u32 val; 351 352 if (!tzd) { 353 val = readl_relaxed(tsc->regs + TSENSOR_SENSOR0_CONFIG0); 354 val &= ~TSENSOR_SENSOR0_CONFIG0_SENSOR_STOP; 355 writel_relaxed(val, tsc->regs + TSENSOR_SENSOR0_CONFIG0); 356 357 return 0; 358 } 359 360 tegra_tsensor_get_hw_channel_trips(tzd, &hot_trip, &crit_trip); 361 362 dev_info_once(ts->dev, "ch%u: PMC emergency shutdown trip set to %dC\n", 363 id, DIV_ROUND_CLOSEST(crit_trip, 1000)); 364 365 hot_trip = tegra_tsensor_temp_to_counter(ts, hot_trip); 366 crit_trip = tegra_tsensor_temp_to_counter(ts, crit_trip); 367 368 /* program LEVEL2 counter threshold */ 369 val = readl_relaxed(tsc->regs + TSENSOR_SENSOR0_CONFIG1); 370 val &= ~TSENSOR_SENSOR0_CONFIG1_TH2; 371 val |= FIELD_PREP(TSENSOR_SENSOR0_CONFIG1_TH2, hot_trip); 372 writel_relaxed(val, tsc->regs + TSENSOR_SENSOR0_CONFIG1); 373 374 /* program LEVEL3 counter threshold */ 375 val = readl_relaxed(tsc->regs + TSENSOR_SENSOR0_CONFIG2); 376 val &= ~TSENSOR_SENSOR0_CONFIG2_TH3; 377 val |= FIELD_PREP(TSENSOR_SENSOR0_CONFIG2_TH3, crit_trip); 378 writel_relaxed(val, tsc->regs + TSENSOR_SENSOR0_CONFIG2); 379 380 /* 381 * Enable sensor, emergency shutdown, interrupts for level 1/2/3 382 * breaches and counter overflow condition. 383 * 384 * Disable DIV2 throttle for now since we need to figure out how 385 * to integrate it properly with the thermal framework. 386 * 387 * Thermal levels supported by hardware: 388 * 389 * Level 0 = cold 390 * Level 1 = passive cooling (cpufreq DVFS) 391 * Level 2 = passive cooling assisted by hardware (DIV2) 392 * Level 3 = emergency shutdown assisted by hardware (PMC) 393 */ 394 val = readl_relaxed(tsc->regs + TSENSOR_SENSOR0_CONFIG0); 395 val &= ~TSENSOR_SENSOR0_CONFIG0_SENSOR_STOP; 396 val |= FIELD_PREP(TSENSOR_SENSOR0_CONFIG0_DVFS_EN, 1); 397 val |= FIELD_PREP(TSENSOR_SENSOR0_CONFIG0_HW_FREQ_DIV_EN, 0); 398 val |= FIELD_PREP(TSENSOR_SENSOR0_CONFIG0_THERMAL_RST_EN, 1); 399 val |= FIELD_PREP(TSENSOR_SENSOR0_CONFIG0_INTR_OVERFLOW_EN, 1); 400 val |= FIELD_PREP(TSENSOR_SENSOR0_CONFIG0_INTR_HW_FREQ_DIV_EN, 1); 401 val |= FIELD_PREP(TSENSOR_SENSOR0_CONFIG0_INTR_THERMAL_RST_EN, 1); 402 writel_relaxed(val, tsc->regs + TSENSOR_SENSOR0_CONFIG0); 403 404 err = thermal_zone_device_enable(tzd); 405 if (err) { 406 dev_err(ts->dev, "ch%u: failed to enable zone: %d\n", id, err); 407 return err; 408 } 409 410 return 0; 411 } 412 413 static bool tegra_tsensor_fuse_read_spare(unsigned int spare) 414 { 415 u32 val = 0; 416 417 tegra_fuse_readl(TEGRA30_FUSE_SPARE_BIT + spare * 4, &val); 418 419 return !!val; 420 } 421 422 static int tegra_tsensor_nvmem_setup(struct tegra_tsensor *ts) 423 { 424 u32 i, ate_ver = 0, cal = 0, t1_25C = 0, t2_90C = 0; 425 int err, c1_25C, c2_90C; 426 427 err = tegra_fuse_readl(TEGRA30_FUSE_TEST_PROG_VER, &ate_ver); 428 if (err) { 429 dev_err_probe(ts->dev, err, "failed to get ATE version\n"); 430 return err; 431 } 432 433 if (ate_ver < 8) { 434 dev_info(ts->dev, "unsupported ATE version: %u\n", ate_ver); 435 return -ENODEV; 436 } 437 438 /* 439 * We have two TSENSOR channels in a two different spots on SoC. 440 * Second channel provides more accurate data on older SoC versions, 441 * use it as a primary channel. 442 */ 443 if (ate_ver <= 21) { 444 dev_info_once(ts->dev, 445 "older ATE version detected, channels remapped\n"); 446 ts->swap_channels = true; 447 } 448 449 err = tegra_fuse_readl(TEGRA30_FUSE_TSENSOR_CALIB, &cal); 450 if (err) { 451 dev_err(ts->dev, "failed to get calibration data: %d\n", err); 452 return err; 453 } 454 455 /* get calibrated counter values for 25C/90C thresholds */ 456 c1_25C = FIELD_GET(TEGRA30_FUSE_TSENSOR_CALIB_LOW, cal); 457 c2_90C = FIELD_GET(TEGRA30_FUSE_TSENSOR_CALIB_HIGH, cal); 458 459 /* and calibrated temperatures corresponding to the counter values */ 460 for (i = 0; i < 7; i++) { 461 t1_25C |= tegra_tsensor_fuse_read_spare(14 + i) << i; 462 t1_25C |= tegra_tsensor_fuse_read_spare(21 + i) << i; 463 464 t2_90C |= tegra_tsensor_fuse_read_spare(0 + i) << i; 465 t2_90C |= tegra_tsensor_fuse_read_spare(7 + i) << i; 466 } 467 468 if (c2_90C - c1_25C <= t2_90C - t1_25C) { 469 dev_err(ts->dev, "invalid calibration data: %d %d %u %u\n", 470 c2_90C, c1_25C, t2_90C, t1_25C); 471 return -EINVAL; 472 } 473 474 /* all calibration coefficients are premultiplied by 1000000 */ 475 476 ts->calib.a = DIV_ROUND_CLOSEST((t2_90C - t1_25C) * 1000000, 477 (c2_90C - c1_25C)); 478 479 ts->calib.b = t1_25C * 1000000 - ts->calib.a * c1_25C; 480 481 if (tegra_sku_info.revision == TEGRA_REVISION_A01) { 482 ts->calib.m = -2775; 483 ts->calib.n = 1338811; 484 ts->calib.p = -7300000; 485 } else { 486 ts->calib.m = -3512; 487 ts->calib.n = 1528943; 488 ts->calib.p = -11100000; 489 } 490 491 /* except the coefficient of a reduced quadratic equation */ 492 ts->calib.r = DIV_ROUND_CLOSEST(ts->calib.n, ts->calib.m * 2); 493 494 dev_info_once(ts->dev, 495 "calibration: %d %d %u %u ATE ver: %u SoC rev: %u\n", 496 c2_90C, c1_25C, t2_90C, t1_25C, ate_ver, 497 tegra_sku_info.revision); 498 499 return 0; 500 } 501 502 static int tegra_tsensor_register_channel(struct tegra_tsensor *ts, 503 unsigned int id) 504 { 505 struct tegra_tsensor_channel *tsc = &ts->ch[id]; 506 unsigned int hw_id = ts->swap_channels ? !id : id; 507 508 tsc->ts = ts; 509 tsc->id = id; 510 tsc->regs = ts->regs + 0x40 * (hw_id + 1); 511 512 tsc->tzd = devm_thermal_of_zone_register(ts->dev, id, tsc, &ops); 513 if (IS_ERR(tsc->tzd)) { 514 if (PTR_ERR(tsc->tzd) != -ENODEV) 515 return dev_err_probe(ts->dev, PTR_ERR(tsc->tzd), 516 "failed to register thermal zone\n"); 517 518 /* 519 * It's okay if sensor isn't assigned to any thermal zone 520 * in a device-tree. 521 */ 522 tsc->tzd = NULL; 523 return 0; 524 } 525 526 if (devm_thermal_add_hwmon_sysfs(ts->dev, tsc->tzd)) 527 dev_warn(ts->dev, "failed to add hwmon sysfs attributes\n"); 528 529 return 0; 530 } 531 532 static int tegra_tsensor_probe(struct platform_device *pdev) 533 { 534 struct tegra_tsensor *ts; 535 unsigned int i; 536 int err, irq; 537 538 ts = devm_kzalloc(&pdev->dev, sizeof(*ts), GFP_KERNEL); 539 if (!ts) 540 return -ENOMEM; 541 542 irq = platform_get_irq(pdev, 0); 543 if (irq < 0) 544 return irq; 545 546 ts->dev = &pdev->dev; 547 platform_set_drvdata(pdev, ts); 548 549 ts->regs = devm_platform_ioremap_resource(pdev, 0); 550 if (IS_ERR(ts->regs)) 551 return PTR_ERR(ts->regs); 552 553 ts->clk = devm_clk_get(&pdev->dev, NULL); 554 if (IS_ERR(ts->clk)) 555 return dev_err_probe(&pdev->dev, PTR_ERR(ts->clk), 556 "failed to get clock\n"); 557 558 ts->rst = devm_reset_control_get_exclusive(&pdev->dev, NULL); 559 if (IS_ERR(ts->rst)) 560 return dev_err_probe(&pdev->dev, PTR_ERR(ts->rst), 561 "failed to get reset control\n"); 562 563 err = tegra_tsensor_nvmem_setup(ts); 564 if (err) 565 return err; 566 567 err = tegra_tsensor_hw_enable(ts); 568 if (err) 569 return err; 570 571 err = devm_add_action_or_reset(&pdev->dev, 572 devm_tegra_tsensor_hw_disable, 573 ts); 574 if (err) 575 return err; 576 577 for (i = 0; i < ARRAY_SIZE(ts->ch); i++) { 578 err = tegra_tsensor_register_channel(ts, i); 579 if (err) 580 return err; 581 } 582 583 /* 584 * Enable the channels before setting the interrupt so 585 * set_trips() can not be called while we are setting up the 586 * register TSENSOR_SENSOR0_CONFIG1. With this we close a 587 * potential race window where we are setting up the TH2 and 588 * the temperature hits TH1 resulting to an update of the 589 * TSENSOR_SENSOR0_CONFIG1 register in the ISR. 590 */ 591 for (i = 0; i < ARRAY_SIZE(ts->ch); i++) { 592 err = tegra_tsensor_enable_hw_channel(ts, i); 593 if (err) 594 return err; 595 } 596 597 err = devm_request_threaded_irq(&pdev->dev, irq, NULL, 598 tegra_tsensor_isr, IRQF_ONESHOT, 599 "tegra_tsensor", ts); 600 if (err) 601 return dev_err_probe(&pdev->dev, err, 602 "failed to request interrupt\n"); 603 604 return 0; 605 } 606 607 static int __maybe_unused tegra_tsensor_suspend(struct device *dev) 608 { 609 struct tegra_tsensor *ts = dev_get_drvdata(dev); 610 unsigned int i; 611 int err; 612 613 for (i = 0; i < ARRAY_SIZE(ts->ch); i++) { 614 err = tegra_tsensor_disable_hw_channel(ts, i); 615 if (err) 616 goto enable_channel; 617 } 618 619 err = tegra_tsensor_hw_disable(ts); 620 if (err) 621 goto enable_channel; 622 623 return 0; 624 625 enable_channel: 626 while (i--) 627 tegra_tsensor_enable_hw_channel(ts, i); 628 629 return err; 630 } 631 632 static int __maybe_unused tegra_tsensor_resume(struct device *dev) 633 { 634 struct tegra_tsensor *ts = dev_get_drvdata(dev); 635 unsigned int i; 636 int err; 637 638 err = tegra_tsensor_hw_enable(ts); 639 if (err) 640 return err; 641 642 for (i = 0; i < ARRAY_SIZE(ts->ch); i++) { 643 err = tegra_tsensor_enable_hw_channel(ts, i); 644 if (err) 645 return err; 646 } 647 648 return 0; 649 } 650 651 static const struct dev_pm_ops tegra_tsensor_pm_ops = { 652 SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(tegra_tsensor_suspend, 653 tegra_tsensor_resume) 654 }; 655 656 static const struct of_device_id tegra_tsensor_of_match[] = { 657 { .compatible = "nvidia,tegra30-tsensor", }, 658 {}, 659 }; 660 MODULE_DEVICE_TABLE(of, tegra_tsensor_of_match); 661 662 static struct platform_driver tegra_tsensor_driver = { 663 .probe = tegra_tsensor_probe, 664 .driver = { 665 .name = "tegra30-tsensor", 666 .of_match_table = tegra_tsensor_of_match, 667 .pm = &tegra_tsensor_pm_ops, 668 }, 669 }; 670 module_platform_driver(tegra_tsensor_driver); 671 672 MODULE_DESCRIPTION("NVIDIA Tegra30 Thermal Sensor driver"); 673 MODULE_AUTHOR("Dmitry Osipenko <digetx@gmail.com>"); 674 MODULE_LICENSE("GPL"); 675