drivers/thermal/qcom/qcom-spmi-temp-alarm.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (c) 2011-2015, 2017, 2020, The Linux Foundation. All rights reserved.
   4  */
   5
   6 #include <linux/bitops.h>
   7 #include <linux/delay.h>
   8 #include <linux/err.h>
   9 #include <linux/iio/consumer.h>
  10 #include <linux/interrupt.h>
  11 #include <linux/module.h>
  12 #include <linux/of.h>
  13 #include <linux/platform_device.h>
  14 #include <linux/regmap.h>
  15 #include <linux/thermal.h>
  16
  17 #include "../thermal_hwmon.h"
  18
  19 #define QPNP_TM_REG_DIG_MAJOR           0x01
  20 #define QPNP_TM_REG_TYPE                0x04
  21 #define QPNP_TM_REG_SUBTYPE             0x05
  22 #define QPNP_TM_REG_STATUS              0x08
  23 #define QPNP_TM_REG_SHUTDOWN_CTRL1      0x40
  24 #define QPNP_TM_REG_ALARM_CTRL          0x46
  25
  26 #define QPNP_TM_TYPE                    0x09
  27 #define QPNP_TM_SUBTYPE_GEN1            0x08
  28 #define QPNP_TM_SUBTYPE_GEN2            0x09
  29
  30 #define STATUS_GEN1_STAGE_MASK          GENMASK(1, 0)
  31 #define STATUS_GEN2_STATE_MASK          GENMASK(6, 4)
  32 #define STATUS_GEN2_STATE_SHIFT         4
  33
  34 #define SHUTDOWN_CTRL1_OVERRIDE_S2      BIT(6)
  35 #define SHUTDOWN_CTRL1_THRESHOLD_MASK   GENMASK(1, 0)
  36
  37 #define SHUTDOWN_CTRL1_RATE_25HZ        BIT(3)
  38
  39 #define ALARM_CTRL_FORCE_ENABLE         BIT(7)
  40
  41 #define THRESH_COUNT                    4
  42 #define STAGE_COUNT                     3
  43
  44 /* Over-temperature trip point values in mC */
  45 static const long temp_map_gen1[THRESH_COUNT][STAGE_COUNT] = {
  46         { 105000, 125000, 145000 },
  47         { 110000, 130000, 150000 },
  48         { 115000, 135000, 155000 },
  49         { 120000, 140000, 160000 },
  50 };
  51
  52 static const long temp_map_gen2_v1[THRESH_COUNT][STAGE_COUNT] = {
  53         {  90000, 110000, 140000 },
  54         {  95000, 115000, 145000 },
  55         { 100000, 120000, 150000 },
  56         { 105000, 125000, 155000 },
  57 };
  58
  59 #define TEMP_THRESH_STEP                5000 /* Threshold step: 5 C */
  60
  61 #define THRESH_MIN                      0
  62 #define THRESH_MAX                      3
  63
  64 #define TEMP_STAGE_HYSTERESIS           2000
  65
  66 /* Temperature in Milli Celsius reported during stage 0 if no ADC is present */
  67 #define DEFAULT_TEMP                    37000
  68
  69 struct qpnp_tm_chip {
  70         struct regmap                   *map;
  71         struct device                   *dev;
  72         struct thermal_zone_device      *tz_dev;
  73         unsigned int                    subtype;
  74         long                            temp;
  75         unsigned int                    thresh;
  76         unsigned int                    stage;
  77         unsigned int                    base;
  78         /* protects .thresh, .stage and chip registers */
  79         struct mutex                    lock;
  80         bool                            initialized;
  81
  82         struct iio_channel              *adc;
  83         const long                      (*temp_map)[THRESH_COUNT][STAGE_COUNT];
  84 };
  85
  86 /* This array maps from GEN2 alarm state to GEN1 alarm stage */
  87 static const unsigned int alarm_state_map[8] = {0, 1, 1, 2, 2, 3, 3, 3};
  88
  89 static int qpnp_tm_read(struct qpnp_tm_chip *chip, u16 addr, u8 *data)
  90 {
  91         unsigned int val;
  92         int ret;
  93
  94         ret = regmap_read(chip->map, chip->base + addr, &val);
  95         if (ret < 0)
  96                 return ret;
  97
  98         *data = val;
  99         return 0;
 100 }
 101
 102 static int qpnp_tm_write(struct qpnp_tm_chip *chip, u16 addr, u8 data)
 103 {
 104         return regmap_write(chip->map, chip->base + addr, data);
 105 }
 106
 107 /**
 108  * qpnp_tm_decode_temp() - return temperature in mC corresponding to the
 109  *              specified over-temperature stage
 110  * @chip:               Pointer to the qpnp_tm chip
 111  * @stage:              Over-temperature stage
 112  *
 113  * Return: temperature in mC
 114  */
 115 static long qpnp_tm_decode_temp(struct qpnp_tm_chip *chip, unsigned int stage)
 116 {
 117         if (!chip->temp_map || chip->thresh >= THRESH_COUNT || stage == 0 ||
 118             stage > STAGE_COUNT)
 119                 return 0;
 120
 121         return (*chip->temp_map)[chip->thresh][stage - 1];
 122 }
 123
 124 /**
 125  * qpnp_tm_get_temp_stage() - return over-temperature stage
 126  * @chip:               Pointer to the qpnp_tm chip
 127  *
 128  * Return: stage (GEN1) or state (GEN2) on success, or errno on failure.
 129  */
 130 static int qpnp_tm_get_temp_stage(struct qpnp_tm_chip *chip)
 131 {
 132         int ret;
 133         u8 reg = 0;
 134
 135         ret = qpnp_tm_read(chip, QPNP_TM_REG_STATUS, &reg);
 136         if (ret < 0)
 137                 return ret;
 138
 139         if (chip->subtype == QPNP_TM_SUBTYPE_GEN1)
 140                 ret = reg & STATUS_GEN1_STAGE_MASK;
 141         else
 142                 ret = (reg & STATUS_GEN2_STATE_MASK) >> STATUS_GEN2_STATE_SHIFT;
 143
 144         return ret;
 145 }
 146
 147 /*
 148  * This function updates the internal temp value based on the
 149  * current thermal stage and threshold as well as the previous stage
 150  */
 151 static int qpnp_tm_update_temp_no_adc(struct qpnp_tm_chip *chip)
 152 {
 153         unsigned int stage, stage_new, stage_old;
 154         int ret;
 155
 156         WARN_ON(!mutex_is_locked(&chip->lock));
 157
 158         ret = qpnp_tm_get_temp_stage(chip);
 159         if (ret < 0)
 160                 return ret;
 161         stage = ret;
 162
 163         if (chip->subtype == QPNP_TM_SUBTYPE_GEN1) {
 164                 stage_new = stage;
 165                 stage_old = chip->stage;
 166         } else {
 167                 stage_new = alarm_state_map[stage];
 168                 stage_old = alarm_state_map[chip->stage];
 169         }
 170
 171         if (stage_new > stage_old) {
 172                 /* increasing stage, use lower bound */
 173                 chip->temp = qpnp_tm_decode_temp(chip, stage_new)
 174                                 + TEMP_STAGE_HYSTERESIS;
 175         } else if (stage_new < stage_old) {
 176                 /* decreasing stage, use upper bound */
 177                 chip->temp = qpnp_tm_decode_temp(chip, stage_new + 1)
 178                                 - TEMP_STAGE_HYSTERESIS;
 179         }
 180
 181         chip->stage = stage;
 182
 183         return 0;
 184 }
 185
 186 static int qpnp_tm_get_temp(struct thermal_zone_device *tz, int *temp)
 187 {
 188         struct qpnp_tm_chip *chip = thermal_zone_device_priv(tz);
 189         int ret, mili_celsius;
 190
 191         if (!temp)
 192                 return -EINVAL;
 193
 194         if (!chip->initialized) {
 195                 *temp = DEFAULT_TEMP;
 196                 return 0;
 197         }
 198
 199         if (!chip->adc) {
 200                 mutex_lock(&chip->lock);
 201                 ret = qpnp_tm_update_temp_no_adc(chip);
 202                 mutex_unlock(&chip->lock);
 203                 if (ret < 0)
 204                         return ret;
 205         } else {
 206                 ret = iio_read_channel_processed(chip->adc, &mili_celsius);
 207                 if (ret < 0)
 208                         return ret;
 209
 210                 chip->temp = mili_celsius;
 211         }
 212
 213         *temp = chip->temp;
 214
 215         return 0;
 216 }
 217
 218 static int qpnp_tm_update_critical_trip_temp(struct qpnp_tm_chip *chip,
 219                                              int temp)
 220 {
 221         long stage2_threshold_min = (*chip->temp_map)[THRESH_MIN][1];
 222         long stage2_threshold_max = (*chip->temp_map)[THRESH_MAX][1];
 223         bool disable_s2_shutdown = false;
 224         u8 reg;
 225
 226         WARN_ON(!mutex_is_locked(&chip->lock));
 227
 228         /*
 229          * Default: S2 and S3 shutdown enabled, thresholds at
 230          * lowest threshold set, monitoring at 25Hz
 231          */
 232         reg = SHUTDOWN_CTRL1_RATE_25HZ;
 233
 234         if (temp == THERMAL_TEMP_INVALID ||
 235             temp < stage2_threshold_min) {
 236                 chip->thresh = THRESH_MIN;
 237                 goto skip;
 238         }
 239
 240         if (temp <= stage2_threshold_max) {
 241                 chip->thresh = THRESH_MAX -
 242                         ((stage2_threshold_max - temp) /
 243                          TEMP_THRESH_STEP);
 244                 disable_s2_shutdown = true;
 245         } else {
 246                 chip->thresh = THRESH_MAX;
 247
 248                 if (chip->adc)
 249                         disable_s2_shutdown = true;
 250                 else
 251                         dev_warn(chip->dev,
 252                                  "No ADC is configured and critical temperature %d mC is above the maximum stage 2 threshold of %ld mC! Configuring stage 2 shutdown at %ld mC.\n",
 253                                  temp, stage2_threshold_max, stage2_threshold_max);
 254         }
 255
 256 skip:
 257         reg |= chip->thresh;
 258         if (disable_s2_shutdown)
 259                 reg |= SHUTDOWN_CTRL1_OVERRIDE_S2;
 260
 261         return qpnp_tm_write(chip, QPNP_TM_REG_SHUTDOWN_CTRL1, reg);
 262 }
 263
 264 static int qpnp_tm_set_trip_temp(struct thermal_zone_device *tz,
 265                                  const struct thermal_trip *trip, int temp)
 266 {
 267         struct qpnp_tm_chip *chip = thermal_zone_device_priv(tz);
 268         int ret;
 269
 270         if (trip->type != THERMAL_TRIP_CRITICAL)
 271                 return 0;
 272
 273         mutex_lock(&chip->lock);
 274         ret = qpnp_tm_update_critical_trip_temp(chip, temp);
 275         mutex_unlock(&chip->lock);
 276
 277         return ret;
 278 }
 279
 280 static const struct thermal_zone_device_ops qpnp_tm_sensor_ops = {
 281         .get_temp = qpnp_tm_get_temp,
 282         .set_trip_temp = qpnp_tm_set_trip_temp,
 283 };
 284
 285 static irqreturn_t qpnp_tm_isr(int irq, void *data)
 286 {
 287         struct qpnp_tm_chip *chip = data;
 288
 289         thermal_zone_device_update(chip->tz_dev, THERMAL_EVENT_UNSPECIFIED);
 290
 291         return IRQ_HANDLED;
 292 }
 293
 294 /*
 295  * This function initializes the internal temp value based on only the
 296  * current thermal stage and threshold. Setup threshold control and
 297  * disable shutdown override.
 298  */
 299 static int qpnp_tm_init(struct qpnp_tm_chip *chip)
 300 {
 301         unsigned int stage;
 302         int ret;
 303         u8 reg = 0;
 304         int crit_temp;
 305
 306         mutex_lock(&chip->lock);
 307
 308         ret = qpnp_tm_read(chip, QPNP_TM_REG_SHUTDOWN_CTRL1, &reg);
 309         if (ret < 0)
 310                 goto out;
 311
 312         chip->thresh = reg & SHUTDOWN_CTRL1_THRESHOLD_MASK;
 313         chip->temp = DEFAULT_TEMP;
 314
 315         ret = qpnp_tm_get_temp_stage(chip);
 316         if (ret < 0)
 317                 goto out;
 318         chip->stage = ret;
 319
 320         stage = chip->subtype == QPNP_TM_SUBTYPE_GEN1
 321                 ? chip->stage : alarm_state_map[chip->stage];
 322
 323         if (stage)
 324                 chip->temp = qpnp_tm_decode_temp(chip, stage);
 325
 326         mutex_unlock(&chip->lock);
 327
 328         ret = thermal_zone_get_crit_temp(chip->tz_dev, &crit_temp);
 329         if (ret)
 330                 crit_temp = THERMAL_TEMP_INVALID;
 331
 332         mutex_lock(&chip->lock);
 333
 334         ret = qpnp_tm_update_critical_trip_temp(chip, crit_temp);
 335         if (ret < 0)
 336                 goto out;
 337
 338         /* Enable the thermal alarm PMIC module in always-on mode. */
 339         reg = ALARM_CTRL_FORCE_ENABLE;
 340         ret = qpnp_tm_write(chip, QPNP_TM_REG_ALARM_CTRL, reg);
 341
 342         chip->initialized = true;
 343
 344 out:
 345         mutex_unlock(&chip->lock);
 346         return ret;
 347 }
 348
 349 static int qpnp_tm_probe(struct platform_device *pdev)
 350 {
 351         struct qpnp_tm_chip *chip;
 352         struct device_node *node;
 353         u8 type, subtype, dig_major;
 354         u32 res;
 355         int ret, irq;
 356
 357         node = pdev->dev.of_node;
 358
 359         chip = devm_kzalloc(&pdev->dev, sizeof(*chip), GFP_KERNEL);
 360         if (!chip)
 361                 return -ENOMEM;
 362
 363         dev_set_drvdata(&pdev->dev, chip);
 364         chip->dev = &pdev->dev;
 365
 366         mutex_init(&chip->lock);
 367
 368         chip->map = dev_get_regmap(pdev->dev.parent, NULL);
 369         if (!chip->map)
 370                 return -ENXIO;
 371
 372         ret = of_property_read_u32(node, "reg", &res);
 373         if (ret < 0)
 374                 return ret;
 375
 376         irq = platform_get_irq(pdev, 0);
 377         if (irq < 0)
 378                 return irq;
 379
 380         /* ADC based measurements are optional */
 381         chip->adc = devm_iio_channel_get(&pdev->dev, "thermal");
 382         if (IS_ERR(chip->adc)) {
 383                 ret = PTR_ERR(chip->adc);
 384                 chip->adc = NULL;
 385                 if (ret == -EPROBE_DEFER)
 386                         return ret;
 387         }
 388
 389         chip->base = res;
 390
 391         ret = qpnp_tm_read(chip, QPNP_TM_REG_TYPE, &type);
 392         if (ret < 0)
 393                 return dev_err_probe(&pdev->dev, ret,
 394                                      "could not read type\n");
 395
 396         ret = qpnp_tm_read(chip, QPNP_TM_REG_SUBTYPE, &subtype);
 397         if (ret < 0)
 398                 return dev_err_probe(&pdev->dev, ret,
 399                                      "could not read subtype\n");
 400
 401         ret = qpnp_tm_read(chip, QPNP_TM_REG_DIG_MAJOR, &dig_major);
 402         if (ret < 0)
 403                 return dev_err_probe(&pdev->dev, ret,
 404                                      "could not read dig_major\n");
 405
 406         if (type != QPNP_TM_TYPE || (subtype != QPNP_TM_SUBTYPE_GEN1
 407                                      && subtype != QPNP_TM_SUBTYPE_GEN2)) {
 408                 dev_err(&pdev->dev, "invalid type 0x%02x or subtype 0x%02x\n",
 409                         type, subtype);
 410                 return -ENODEV;
 411         }
 412
 413         chip->subtype = subtype;
 414         if (subtype == QPNP_TM_SUBTYPE_GEN2 && dig_major >= 1)
 415                 chip->temp_map = &temp_map_gen2_v1;
 416         else
 417                 chip->temp_map = &temp_map_gen1;
 418
 419         /*
 420          * Register the sensor before initializing the hardware to be able to
 421          * read the trip points. get_temp() returns the default temperature
 422          * before the hardware initialization is completed.
 423          */
 424         chip->tz_dev = devm_thermal_of_zone_register(
 425                 &pdev->dev, 0, chip, &qpnp_tm_sensor_ops);
 426         if (IS_ERR(chip->tz_dev))
 427                 return dev_err_probe(&pdev->dev, PTR_ERR(chip->tz_dev),
 428                                      "failed to register sensor\n");
 429
 430         ret = qpnp_tm_init(chip);
 431         if (ret < 0)
 432                 return dev_err_probe(&pdev->dev, ret, "init failed\n");
 433
 434         devm_thermal_add_hwmon_sysfs(&pdev->dev, chip->tz_dev);
 435
 436         ret = devm_request_threaded_irq(&pdev->dev, irq, NULL, qpnp_tm_isr,
 437                                         IRQF_ONESHOT, node->name, chip);
 438         if (ret < 0)
 439                 return ret;
 440
 441         thermal_zone_device_update(chip->tz_dev, THERMAL_EVENT_UNSPECIFIED);
 442
 443         return 0;
 444 }
 445
 446 static const struct of_device_id qpnp_tm_match_table[] = {
 447         { .compatible = "qcom,spmi-temp-alarm" },
 448         { }
 449 };
 450 MODULE_DEVICE_TABLE(of, qpnp_tm_match_table);
 451
 452 static struct platform_driver qpnp_tm_driver = {
 453         .driver = {
 454                 .name = "spmi-temp-alarm",
 455                 .of_match_table = qpnp_tm_match_table,
 456         },
 457         .probe  = qpnp_tm_probe,
 458 };
 459 module_platform_driver(qpnp_tm_driver);
 460
 461 MODULE_ALIAS("platform:spmi-temp-alarm");
 462 MODULE_DESCRIPTION("QPNP PMIC Temperature Alarm driver");
 463 MODULE_LICENSE("GPL v2");