drivers/thermal/hisi_thermal.c

   1 /*
   2  * Hisilicon thermal sensor driver
   3  *
   4  * Copyright (c) 2014-2015 Hisilicon Limited.
   5  * Copyright (c) 2014-2015 Linaro Limited.
   6  *
   7  * Xinwei Kong <kong.kongxinwei@hisilicon.com>
   8  * Leo Yan <leo.yan@linaro.org>
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License version 2 as
  12  * published by the Free Software Foundation.
  13  *
  14  * This program is distributed "as is" WITHOUT ANY WARRANTY of any
  15  * kind, whether express or implied; without even the implied warranty
  16  * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  17  * GNU General Public License for more details.
  18  */
  19
  20 #include <linux/cpufreq.h>
  21 #include <linux/delay.h>
  22 #include <linux/interrupt.h>
  23 #include <linux/module.h>
  24 #include <linux/platform_device.h>
  25 #include <linux/io.h>
  26 #include <linux/of_device.h>
  27
  28 #include "thermal_core.h"
  29
  30 #define HI6220_TEMP0_LAG                        (0x0)
  31 #define HI6220_TEMP0_TH                         (0x4)
  32 #define HI6220_TEMP0_RST_TH                     (0x8)
  33 #define HI6220_TEMP0_CFG                        (0xC)
  34 #define HI6220_TEMP0_CFG_SS_MSK                 (0xF000)
  35 #define HI6220_TEMP0_CFG_HDAK_MSK               (0x30)
  36 #define HI6220_TEMP0_EN                         (0x10)
  37 #define HI6220_TEMP0_INT_EN                     (0x14)
  38 #define HI6220_TEMP0_INT_CLR                    (0x18)
  39 #define HI6220_TEMP0_RST_MSK                    (0x1C)
  40 #define HI6220_TEMP0_VALUE                      (0x28)
  41
  42 #define HI3660_OFFSET(chan)             ((chan) * 0x40)
  43 #define HI3660_TEMP(chan)               (HI3660_OFFSET(chan) + 0x1C)
  44 #define HI3660_TH(chan)                 (HI3660_OFFSET(chan) + 0x20)
  45 #define HI3660_LAG(chan)                (HI3660_OFFSET(chan) + 0x28)
  46 #define HI3660_INT_EN(chan)             (HI3660_OFFSET(chan) + 0x2C)
  47 #define HI3660_INT_CLR(chan)            (HI3660_OFFSET(chan) + 0x30)
  48
  49 #define HI6220_TEMP_BASE                        (-60000)
  50 #define HI6220_TEMP_RESET                       (100000)
  51 #define HI6220_TEMP_STEP                        (785)
  52 #define HI6220_TEMP_LAG                         (3500)
  53
  54 #define HI3660_TEMP_BASE                (-63780)
  55 #define HI3660_TEMP_STEP                (205)
  56 #define HI3660_TEMP_LAG                 (4000)
  57
  58 #define HI6220_CLUSTER0_SENSOR          2
  59 #define HI6220_CLUSTER1_SENSOR          1
  60
  61 #define HI3660_LITTLE_SENSOR            0
  62 #define HI3660_BIG_SENSOR               1
  63 #define HI3660_G3D_SENSOR               2
  64 #define HI3660_MODEM_SENSOR             3
  65
  66 struct hisi_thermal_data;
  67
  68 struct hisi_thermal_sensor {
  69         struct hisi_thermal_data *data;
  70         struct thermal_zone_device *tzd;
  71         const char *irq_name;
  72         uint32_t id;
  73         uint32_t thres_temp;
  74 };
  75
  76 struct hisi_thermal_ops {
  77         int (*get_temp)(struct hisi_thermal_sensor *sensor);
  78         int (*enable_sensor)(struct hisi_thermal_sensor *sensor);
  79         int (*disable_sensor)(struct hisi_thermal_sensor *sensor);
  80         int (*irq_handler)(struct hisi_thermal_sensor *sensor);
  81         int (*probe)(struct hisi_thermal_data *data);
  82 };
  83
  84 struct hisi_thermal_data {
  85         const struct hisi_thermal_ops *ops;
  86         struct hisi_thermal_sensor *sensor;
  87         struct platform_device *pdev;
  88         struct clk *clk;
  89         void __iomem *regs;
  90         int nr_sensors;
  91 };
  92
  93 /*
  94  * The temperature computation on the tsensor is as follow:
  95  *      Unit: millidegree Celsius
  96  *      Step: 200/255 (0.7843)
  97  *      Temperature base: -60°C
  98  *
  99  * The register is programmed in temperature steps, every step is 785
 100  * millidegree and begins at -60 000 m°C
 101  *
 102  * The temperature from the steps:
 103  *
 104  *      Temp = TempBase + (steps x 785)
 105  *
 106  * and the steps from the temperature:
 107  *
 108  *      steps = (Temp - TempBase) / 785
 109  *
 110  */
 111 static inline int hi6220_thermal_step_to_temp(int step)
 112 {
 113         return HI6220_TEMP_BASE + (step * HI6220_TEMP_STEP);
 114 }
 115
 116 static inline int hi6220_thermal_temp_to_step(int temp)
 117 {
 118         return DIV_ROUND_UP(temp - HI6220_TEMP_BASE, HI6220_TEMP_STEP);
 119 }
 120
 121 /*
 122  * for Hi3660,
 123  *      Step: 189/922 (0.205)
 124  *      Temperature base: -63.780°C
 125  *
 126  * The register is programmed in temperature steps, every step is 205
 127  * millidegree and begins at -63 780 m°C
 128  */
 129 static inline int hi3660_thermal_step_to_temp(int step)
 130 {
 131         return HI3660_TEMP_BASE + step * HI3660_TEMP_STEP;
 132 }
 133
 134 static inline int hi3660_thermal_temp_to_step(int temp)
 135 {
 136         return DIV_ROUND_UP(temp - HI3660_TEMP_BASE, HI3660_TEMP_STEP);
 137 }
 138
 139 /*
 140  * The lag register contains 5 bits encoding the temperature in steps.
 141  *
 142  * Each time the temperature crosses the threshold boundary, an
 143  * interrupt is raised. It could be when the temperature is going
 144  * above the threshold or below. However, if the temperature is
 145  * fluctuating around this value due to the load, we can receive
 146  * several interrupts which may not desired.
 147  *
 148  * We can setup a temperature representing the delta between the
 149  * threshold and the current temperature when the temperature is
 150  * decreasing.
 151  *
 152  * For instance: the lag register is 5°C, the threshold is 65°C, when
 153  * the temperature reaches 65°C an interrupt is raised and when the
 154  * temperature decrease to 65°C - 5°C another interrupt is raised.
 155  *
 156  * A very short lag can lead to an interrupt storm, a long lag
 157  * increase the latency to react to the temperature changes.  In our
 158  * case, that is not really a problem as we are polling the
 159  * temperature.
 160  *
 161  * [0:4] : lag register
 162  *
 163  * The temperature is coded in steps, cf. HI6220_TEMP_STEP.
 164  *
 165  * Min : 0x00 :  0.0 °C
 166  * Max : 0x1F : 24.3 °C
 167  *
 168  * The 'value' parameter is in milliCelsius.
 169  */
 170 static inline void hi6220_thermal_set_lag(void __iomem *addr, int value)
 171 {
 172         writel(DIV_ROUND_UP(value, HI6220_TEMP_STEP) & 0x1F,
 173                         addr + HI6220_TEMP0_LAG);
 174 }
 175
 176 static inline void hi6220_thermal_alarm_clear(void __iomem *addr, int value)
 177 {
 178         writel(value, addr + HI6220_TEMP0_INT_CLR);
 179 }
 180
 181 static inline void hi6220_thermal_alarm_enable(void __iomem *addr, int value)
 182 {
 183         writel(value, addr + HI6220_TEMP0_INT_EN);
 184 }
 185
 186 static inline void hi6220_thermal_alarm_set(void __iomem *addr, int temp)
 187 {
 188         writel(hi6220_thermal_temp_to_step(temp) | 0x0FFFFFF00,
 189                addr + HI6220_TEMP0_TH);
 190 }
 191
 192 static inline void hi6220_thermal_reset_set(void __iomem *addr, int temp)
 193 {
 194         writel(hi6220_thermal_temp_to_step(temp), addr + HI6220_TEMP0_RST_TH);
 195 }
 196
 197 static inline void hi6220_thermal_reset_enable(void __iomem *addr, int value)
 198 {
 199         writel(value, addr + HI6220_TEMP0_RST_MSK);
 200 }
 201
 202 static inline void hi6220_thermal_enable(void __iomem *addr, int value)
 203 {
 204         writel(value, addr + HI6220_TEMP0_EN);
 205 }
 206
 207 static inline int hi6220_thermal_get_temperature(void __iomem *addr)
 208 {
 209         return hi6220_thermal_step_to_temp(readl(addr + HI6220_TEMP0_VALUE));
 210 }
 211
 212 /*
 213  * [0:6] lag register
 214  *
 215  * The temperature is coded in steps, cf. HI3660_TEMP_STEP.
 216  *
 217  * Min : 0x00 :  0.0 °C
 218  * Max : 0x7F : 26.0 °C
 219  *
 220  */
 221 static inline void hi3660_thermal_set_lag(void __iomem *addr,
 222                                           int id, int value)
 223 {
 224         writel(DIV_ROUND_UP(value, HI3660_TEMP_STEP) & 0x7F,
 225                         addr + HI3660_LAG(id));
 226 }
 227
 228 static inline void hi3660_thermal_alarm_clear(void __iomem *addr,
 229                                               int id, int value)
 230 {
 231         writel(value, addr + HI3660_INT_CLR(id));
 232 }
 233
 234 static inline void hi3660_thermal_alarm_enable(void __iomem *addr,
 235                                                int id, int value)
 236 {
 237         writel(value, addr + HI3660_INT_EN(id));
 238 }
 239
 240 static inline void hi3660_thermal_alarm_set(void __iomem *addr,
 241                                             int id, int value)
 242 {
 243         writel(value, addr + HI3660_TH(id));
 244 }
 245
 246 static inline int hi3660_thermal_get_temperature(void __iomem *addr, int id)
 247 {
 248         return hi3660_thermal_step_to_temp(readl(addr + HI3660_TEMP(id)));
 249 }
 250
 251 /*
 252  * Temperature configuration register - Sensor selection
 253  *
 254  * Bits [19:12]
 255  *
 256  * 0x0: local sensor (default)
 257  * 0x1: remote sensor 1 (ACPU cluster 1)
 258  * 0x2: remote sensor 2 (ACPU cluster 0)
 259  * 0x3: remote sensor 3 (G3D)
 260  */
 261 static inline void hi6220_thermal_sensor_select(void __iomem *addr, int sensor)
 262 {
 263         writel((readl(addr + HI6220_TEMP0_CFG) & ~HI6220_TEMP0_CFG_SS_MSK) |
 264                (sensor << 12), addr + HI6220_TEMP0_CFG);
 265 }
 266
 267 /*
 268  * Temperature configuration register - Hdak conversion polling interval
 269  *
 270  * Bits [5:4]
 271  *
 272  * 0x0 :   0.768 ms
 273  * 0x1 :   6.144 ms
 274  * 0x2 :  49.152 ms
 275  * 0x3 : 393.216 ms
 276  */
 277 static inline void hi6220_thermal_hdak_set(void __iomem *addr, int value)
 278 {
 279         writel((readl(addr + HI6220_TEMP0_CFG) & ~HI6220_TEMP0_CFG_HDAK_MSK) |
 280                (value << 4), addr + HI6220_TEMP0_CFG);
 281 }
 282
 283 static int hi6220_thermal_irq_handler(struct hisi_thermal_sensor *sensor)
 284 {
 285         struct hisi_thermal_data *data = sensor->data;
 286
 287         hi6220_thermal_alarm_clear(data->regs, 1);
 288         return 0;
 289 }
 290
 291 static int hi3660_thermal_irq_handler(struct hisi_thermal_sensor *sensor)
 292 {
 293         struct hisi_thermal_data *data = sensor->data;
 294
 295         hi3660_thermal_alarm_clear(data->regs, sensor->id, 1);
 296         return 0;
 297 }
 298
 299 static int hi6220_thermal_get_temp(struct hisi_thermal_sensor *sensor)
 300 {
 301         struct hisi_thermal_data *data = sensor->data;
 302
 303         return hi6220_thermal_get_temperature(data->regs);
 304 }
 305
 306 static int hi3660_thermal_get_temp(struct hisi_thermal_sensor *sensor)
 307 {
 308         struct hisi_thermal_data *data = sensor->data;
 309
 310         return hi3660_thermal_get_temperature(data->regs, sensor->id);
 311 }
 312
 313 static int hi6220_thermal_disable_sensor(struct hisi_thermal_sensor *sensor)
 314 {
 315         struct hisi_thermal_data *data = sensor->data;
 316
 317         /* disable sensor module */
 318         hi6220_thermal_enable(data->regs, 0);
 319         hi6220_thermal_alarm_enable(data->regs, 0);
 320         hi6220_thermal_reset_enable(data->regs, 0);
 321
 322         clk_disable_unprepare(data->clk);
 323
 324         return 0;
 325 }
 326
 327 static int hi3660_thermal_disable_sensor(struct hisi_thermal_sensor *sensor)
 328 {
 329         struct hisi_thermal_data *data = sensor->data;
 330
 331         /* disable sensor module */
 332         hi3660_thermal_alarm_enable(data->regs, sensor->id, 0);
 333         return 0;
 334 }
 335
 336 static int hi6220_thermal_enable_sensor(struct hisi_thermal_sensor *sensor)
 337 {
 338         struct hisi_thermal_data *data = sensor->data;
 339         int ret;
 340
 341         /* enable clock for tsensor */
 342         ret = clk_prepare_enable(data->clk);
 343         if (ret)
 344                 return ret;
 345
 346         /* disable module firstly */
 347         hi6220_thermal_reset_enable(data->regs, 0);
 348         hi6220_thermal_enable(data->regs, 0);
 349
 350         /* select sensor id */
 351         hi6220_thermal_sensor_select(data->regs, sensor->id);
 352
 353         /* setting the hdak time */
 354         hi6220_thermal_hdak_set(data->regs, 0);
 355
 356         /* setting lag value between current temp and the threshold */
 357         hi6220_thermal_set_lag(data->regs, HI6220_TEMP_LAG);
 358
 359         /* enable for interrupt */
 360         hi6220_thermal_alarm_set(data->regs, sensor->thres_temp);
 361
 362         hi6220_thermal_reset_set(data->regs, HI6220_TEMP_RESET);
 363
 364         /* enable module */
 365         hi6220_thermal_reset_enable(data->regs, 1);
 366         hi6220_thermal_enable(data->regs, 1);
 367
 368         hi6220_thermal_alarm_clear(data->regs, 0);
 369         hi6220_thermal_alarm_enable(data->regs, 1);
 370
 371         return 0;
 372 }
 373
 374 static int hi3660_thermal_enable_sensor(struct hisi_thermal_sensor *sensor)
 375 {
 376         unsigned int value;
 377         struct hisi_thermal_data *data = sensor->data;
 378
 379         /* disable interrupt */
 380         hi3660_thermal_alarm_enable(data->regs, sensor->id, 0);
 381
 382         /* setting lag value between current temp and the threshold */
 383         hi3660_thermal_set_lag(data->regs, sensor->id, HI3660_TEMP_LAG);
 384
 385         /* set interrupt threshold */
 386         value = hi3660_thermal_temp_to_step(sensor->thres_temp);
 387         hi3660_thermal_alarm_set(data->regs, sensor->id, value);
 388
 389         /* enable interrupt */
 390         hi3660_thermal_alarm_clear(data->regs, sensor->id, 1);
 391         hi3660_thermal_alarm_enable(data->regs, sensor->id, 1);
 392
 393         return 0;
 394 }
 395
 396 static int hi6220_thermal_probe(struct hisi_thermal_data *data)
 397 {
 398         struct platform_device *pdev = data->pdev;
 399         struct device *dev = &pdev->dev;
 400         int ret;
 401
 402         data->clk = devm_clk_get(dev, "thermal_clk");
 403         if (IS_ERR(data->clk)) {
 404                 ret = PTR_ERR(data->clk);
 405                 if (ret != -EPROBE_DEFER)
 406                         dev_err(dev, "failed to get thermal clk: %d\n", ret);
 407                 return ret;
 408         }
 409
 410         data->sensor = devm_kzalloc(dev, sizeof(*data->sensor), GFP_KERNEL);
 411         if (!data->sensor)
 412                 return -ENOMEM;
 413
 414         data->sensor[0].id = HI6220_CLUSTER0_SENSOR;
 415         data->sensor[0].irq_name = "tsensor_intr";
 416         data->sensor[0].data = data;
 417         data->nr_sensors = 1;
 418
 419         return 0;
 420 }
 421
 422 static int hi3660_thermal_probe(struct hisi_thermal_data *data)
 423 {
 424         struct platform_device *pdev = data->pdev;
 425         struct device *dev = &pdev->dev;
 426
 427         data->nr_sensors = 1;
 428
 429         data->sensor = devm_kzalloc(dev, sizeof(*data->sensor) *
 430                                     data->nr_sensors, GFP_KERNEL);
 431         if (!data->sensor)
 432                 return -ENOMEM;
 433
 434         data->sensor[0].id = HI3660_BIG_SENSOR;
 435         data->sensor[0].irq_name = "tsensor_a73";
 436         data->sensor[0].data = data;
 437
 438         data->sensor[1].id = HI3660_LITTLE_SENSOR;
 439         data->sensor[1].irq_name = "tsensor_a53";
 440         data->sensor[1].data = data;
 441
 442         return 0;
 443 }
 444
 445 static int hisi_thermal_get_temp(void *__data, int *temp)
 446 {
 447         struct hisi_thermal_sensor *sensor = __data;
 448         struct hisi_thermal_data *data = sensor->data;
 449
 450         *temp = data->ops->get_temp(sensor);
 451
 452         dev_dbg(&data->pdev->dev, "tzd=%p, id=%d, temp=%d, thres=%d\n",
 453                 sensor->tzd, sensor->id, *temp, sensor->thres_temp);
 454
 455         return 0;
 456 }
 457
 458 static const struct thermal_zone_of_device_ops hisi_of_thermal_ops = {
 459         .get_temp = hisi_thermal_get_temp,
 460 };
 461
 462 static irqreturn_t hisi_thermal_alarm_irq_thread(int irq, void *dev)
 463 {
 464         struct hisi_thermal_sensor *sensor = dev;
 465         struct hisi_thermal_data *data = sensor->data;
 466         int temp = 0;
 467
 468         data->ops->irq_handler(sensor);
 469
 470         hisi_thermal_get_temp(sensor, &temp);
 471
 472         if (temp >= sensor->thres_temp) {
 473                 dev_crit(&data->pdev->dev,
 474                          "sensor <%d> THERMAL ALARM: %d > %d\n",
 475                          sensor->id, temp, sensor->thres_temp);
 476
 477                 thermal_zone_device_update(sensor->tzd,
 478                                            THERMAL_EVENT_UNSPECIFIED);
 479
 480         } else {
 481                 dev_crit(&data->pdev->dev,
 482                          "sensor <%d> THERMAL ALARM stopped: %d < %d\n",
 483                          sensor->id, temp, sensor->thres_temp);
 484         }
 485
 486         return IRQ_HANDLED;
 487 }
 488
 489 static int hisi_thermal_register_sensor(struct platform_device *pdev,
 490                                         struct hisi_thermal_sensor *sensor)
 491 {
 492         int ret, i;
 493         const struct thermal_trip *trip;
 494
 495         sensor->tzd = devm_thermal_zone_of_sensor_register(&pdev->dev,
 496                                                            sensor->id, sensor,
 497                                                            &hisi_of_thermal_ops);
 498         if (IS_ERR(sensor->tzd)) {
 499                 ret = PTR_ERR(sensor->tzd);
 500                 sensor->tzd = NULL;
 501                 dev_err(&pdev->dev, "failed to register sensor id %d: %d\n",
 502                         sensor->id, ret);
 503                 return ret;
 504         }
 505
 506         trip = of_thermal_get_trip_points(sensor->tzd);
 507
 508         for (i = 0; i < of_thermal_get_ntrips(sensor->tzd); i++) {
 509                 if (trip[i].type == THERMAL_TRIP_PASSIVE) {
 510                         sensor->thres_temp = trip[i].temperature;
 511                         break;
 512                 }
 513         }
 514
 515         return 0;
 516 }
 517
 518 static const struct hisi_thermal_ops hi6220_ops = {
 519         .get_temp       = hi6220_thermal_get_temp,
 520         .enable_sensor  = hi6220_thermal_enable_sensor,
 521         .disable_sensor = hi6220_thermal_disable_sensor,
 522         .irq_handler    = hi6220_thermal_irq_handler,
 523         .probe          = hi6220_thermal_probe,
 524 };
 525
 526 static const struct hisi_thermal_ops hi3660_ops = {
 527         .get_temp       = hi3660_thermal_get_temp,
 528         .enable_sensor  = hi3660_thermal_enable_sensor,
 529         .disable_sensor = hi3660_thermal_disable_sensor,
 530         .irq_handler    = hi3660_thermal_irq_handler,
 531         .probe          = hi3660_thermal_probe,
 532 };
 533
 534 static const struct of_device_id of_hisi_thermal_match[] = {
 535         {
 536                 .compatible = "hisilicon,tsensor",
 537                 .data = &hi6220_ops,
 538         },
 539         {
 540                 .compatible = "hisilicon,hi3660-tsensor",
 541                 .data = &hi3660_ops,
 542         },
 543         { /* end */ }
 544 };
 545 MODULE_DEVICE_TABLE(of, of_hisi_thermal_match);
 546
 547 static void hisi_thermal_toggle_sensor(struct hisi_thermal_sensor *sensor,
 548                                        bool on)
 549 {
 550         struct thermal_zone_device *tzd = sensor->tzd;
 551
 552         if (on)
 553                 thermal_zone_device_enable(tzd);
 554         else
 555                 thermal_zone_device_disable(tzd);
 556 }
 557
 558 static int hisi_thermal_probe(struct platform_device *pdev)
 559 {
 560         struct hisi_thermal_data *data;
 561         struct device *dev = &pdev->dev;
 562         struct resource *res;
 563         int i, ret;
 564
 565         data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
 566         if (!data)
 567                 return -ENOMEM;
 568
 569         data->pdev = pdev;
 570         platform_set_drvdata(pdev, data);
 571         data->ops = of_device_get_match_data(dev);
 572
 573         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 574         data->regs = devm_ioremap_resource(dev, res);
 575         if (IS_ERR(data->regs)) {
 576                 dev_err(dev, "failed to get io address\n");
 577                 return PTR_ERR(data->regs);
 578         }
 579
 580         ret = data->ops->probe(data);
 581         if (ret)
 582                 return ret;
 583
 584         for (i = 0; i < data->nr_sensors; i++) {
 585                 struct hisi_thermal_sensor *sensor = &data->sensor[i];
 586
 587                 ret = hisi_thermal_register_sensor(pdev, sensor);
 588                 if (ret) {
 589                         dev_err(dev, "failed to register thermal sensor: %d\n",
 590                                 ret);
 591                         return ret;
 592                 }
 593
 594                 ret = platform_get_irq(pdev, 0);
 595                 if (ret < 0)
 596                         return ret;
 597
 598                 ret = devm_request_threaded_irq(dev, ret, NULL,
 599                                                 hisi_thermal_alarm_irq_thread,
 600                                                 IRQF_ONESHOT, sensor->irq_name,
 601                                                 sensor);
 602                 if (ret < 0) {
 603                         dev_err(dev, "Failed to request alarm irq: %d\n", ret);
 604                         return ret;
 605                 }
 606
 607                 ret = data->ops->enable_sensor(sensor);
 608                 if (ret) {
 609                         dev_err(dev, "Failed to setup the sensor: %d\n", ret);
 610                         return ret;
 611                 }
 612
 613                 hisi_thermal_toggle_sensor(sensor, true);
 614         }
 615
 616         return 0;
 617 }
 618
 619 static int hisi_thermal_remove(struct platform_device *pdev)
 620 {
 621         struct hisi_thermal_data *data = platform_get_drvdata(pdev);
 622         int i;
 623
 624         for (i = 0; i < data->nr_sensors; i++) {
 625                 struct hisi_thermal_sensor *sensor = &data->sensor[i];
 626
 627                 hisi_thermal_toggle_sensor(sensor, false);
 628                 data->ops->disable_sensor(sensor);
 629         }
 630
 631         return 0;
 632 }
 633
 634 #ifdef CONFIG_PM_SLEEP
 635 static int hisi_thermal_suspend(struct device *dev)
 636 {
 637         struct hisi_thermal_data *data = dev_get_drvdata(dev);
 638         int i;
 639
 640         for (i = 0; i < data->nr_sensors; i++)
 641                 data->ops->disable_sensor(&data->sensor[i]);
 642
 643         return 0;
 644 }
 645
 646 static int hisi_thermal_resume(struct device *dev)
 647 {
 648         struct hisi_thermal_data *data = dev_get_drvdata(dev);
 649         int i, ret = 0;
 650
 651         for (i = 0; i < data->nr_sensors; i++)
 652                 ret |= data->ops->enable_sensor(&data->sensor[i]);
 653
 654         return ret;
 655 }
 656 #endif
 657
 658 static SIMPLE_DEV_PM_OPS(hisi_thermal_pm_ops,
 659                          hisi_thermal_suspend, hisi_thermal_resume);
 660
 661 static struct platform_driver hisi_thermal_driver = {
 662         .driver = {
 663                 .name           = "hisi_thermal",
 664                 .pm             = &hisi_thermal_pm_ops,
 665                 .of_match_table = of_hisi_thermal_match,
 666         },
 667         .probe  = hisi_thermal_probe,
 668         .remove = hisi_thermal_remove,
 669 };
 670
 671 module_platform_driver(hisi_thermal_driver);
 672
 673 MODULE_AUTHOR("Xinwei Kong <kong.kongxinwei@hisilicon.com>");
 674 MODULE_AUTHOR("Leo Yan <leo.yan@linaro.org>");
 675 MODULE_DESCRIPTION("Hisilicon thermal driver");
 676 MODULE_LICENSE("GPL v2");