drivers/hwmon/chipcap2.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * cc2.c - Support for the Amphenol ChipCap 2 relative humidity, temperature sensor
   4  *
   5  * Part numbers supported:
   6  * CC2D23, CC2D23S, CC2D25, CC2D25S, CC2D33, CC2D33S, CC2D35, CC2D35S
   7  *
   8  * Author: Javier Carrasco <[email protected]>
   9  *
  10  * Datasheet and application notes:
  11  * https://www.amphenol-sensors.com/en/telaire/humidity/527-humidity-sensors/3095-chipcap-2
  12  */
  13
  14 #include <linux/bitfield.h>
  15 #include <linux/bits.h>
  16 #include <linux/completion.h>
  17 #include <linux/delay.h>
  18 #include <linux/hwmon.h>
  19 #include <linux/i2c.h>
  20 #include <linux/interrupt.h>
  21 #include <linux/irq.h>
  22 #include <linux/module.h>
  23 #include <linux/regulator/consumer.h>
  24
  25 #define CC2_START_CM                    0xA0
  26 #define CC2_START_NOM                   0x80
  27 #define CC2_R_ALARM_H_ON                0x18
  28 #define CC2_R_ALARM_H_OFF               0x19
  29 #define CC2_R_ALARM_L_ON                0x1A
  30 #define CC2_R_ALARM_L_OFF               0x1B
  31 #define CC2_RW_OFFSET                   0x40
  32 #define CC2_W_ALARM_H_ON                (CC2_R_ALARM_H_ON + CC2_RW_OFFSET)
  33 #define CC2_W_ALARM_H_OFF               (CC2_R_ALARM_H_OFF + CC2_RW_OFFSET)
  34 #define CC2_W_ALARM_L_ON                (CC2_R_ALARM_L_ON + CC2_RW_OFFSET)
  35 #define CC2_W_ALARM_L_OFF               (CC2_R_ALARM_L_OFF + CC2_RW_OFFSET)
  36
  37 #define CC2_STATUS_FIELD                GENMASK(7, 6)
  38 #define CC2_STATUS_VALID_DATA           0x00
  39 #define CC2_STATUS_STALE_DATA           0x01
  40 #define CC2_STATUS_CMD_MODE             0x02
  41
  42 #define CC2_RESPONSE_FIELD              GENMASK(1, 0)
  43 #define CC2_RESPONSE_BUSY               0x00
  44 #define CC2_RESPONSE_ACK                0x01
  45 #define CC2_RESPONSE_NACK               0x02
  46
  47 #define CC2_ERR_CORR_EEPROM             BIT(2)
  48 #define CC2_ERR_UNCORR_EEPROM           BIT(3)
  49 #define CC2_ERR_RAM_PARITY              BIT(4)
  50 #define CC2_ERR_CONFIG_LOAD             BIT(5)
  51
  52 #define CC2_EEPROM_SIZE                 10
  53 #define CC2_EEPROM_DATA_LEN             3
  54 #define CC2_MEASUREMENT_DATA_LEN        4
  55
  56 #define CC2_RH_DATA_FIELD               GENMASK(13, 0)
  57
  58 /* ensure clean off -> on transitions */
  59 #define CC2_POWER_CYCLE_MS              80
  60
  61 #define CC2_STARTUP_TO_DATA_MS          55
  62 #define CC2_RESP_START_CM_US            100
  63 #define CC2_RESP_EEPROM_R_US            100
  64 #define CC2_RESP_EEPROM_W_MS            12
  65 #define CC2_STARTUP_TIME_US             1250
  66
  67 #define CC2_RH_MAX                      (100 * 1000U)
  68
  69 #define CC2_CM_RETRIES                  5
  70
  71 struct cc2_rh_alarm_info {
  72         bool low_alarm;
  73         bool high_alarm;
  74         bool low_alarm_visible;
  75         bool high_alarm_visible;
  76 };
  77
  78 struct cc2_data {
  79         struct cc2_rh_alarm_info rh_alarm;
  80         struct completion complete;
  81         struct device *hwmon;
  82         struct i2c_client *client;
  83         struct mutex dev_access_lock; /* device access lock */
  84         struct regulator *regulator;
  85         const char *name;
  86         int irq_ready;
  87         int irq_low;
  88         int irq_high;
  89         bool process_irqs;
  90 };
  91
  92 enum cc2_chan_addr {
  93         CC2_CHAN_TEMP = 0,
  94         CC2_CHAN_HUMIDITY,
  95 };
  96
  97 /* %RH as a per cent mille from a register value */
  98 static long cc2_rh_convert(u16 data)
  99 {
 100         unsigned long tmp = (data & CC2_RH_DATA_FIELD) * CC2_RH_MAX;
 101
 102         return tmp / ((1 << 14) - 1);
 103 }
 104
 105 /* convert %RH to a register value */
 106 static u16 cc2_rh_to_reg(long data)
 107 {
 108         return data * ((1 << 14) - 1) / CC2_RH_MAX;
 109 }
 110
 111 /* temperature in milli degrees celsius from a register value */
 112 static long cc2_temp_convert(u16 data)
 113 {
 114         unsigned long tmp = ((data >> 2) * 165 * 1000U) / ((1 << 14) - 1);
 115
 116         return tmp - 40 * 1000U;
 117 }
 118
 119 static int cc2_enable(struct cc2_data *data)
 120 {
 121         int ret;
 122
 123         /* exclusive regulator, check in case a disable failed */
 124         if (regulator_is_enabled(data->regulator))
 125                 return 0;
 126
 127         /* clear any pending completion */
 128         try_wait_for_completion(&data->complete);
 129
 130         ret = regulator_enable(data->regulator);
 131         if (ret < 0)
 132                 return ret;
 133
 134         usleep_range(CC2_STARTUP_TIME_US, CC2_STARTUP_TIME_US + 125);
 135
 136         data->process_irqs = true;
 137
 138         return 0;
 139 }
 140
 141 static void cc2_disable(struct cc2_data *data)
 142 {
 143         int err;
 144
 145         /* ignore alarms triggered by voltage toggling when powering up */
 146         data->process_irqs = false;
 147
 148         /* exclusive regulator, check in case an enable failed */
 149         if (regulator_is_enabled(data->regulator)) {
 150                 err = regulator_disable(data->regulator);
 151                 if (err)
 152                         dev_dbg(&data->client->dev, "Failed to disable device");
 153         }
 154 }
 155
 156 static int cc2_cmd_response_diagnostic(struct device *dev, u8 status)
 157 {
 158         int resp;
 159
 160         if (FIELD_GET(CC2_STATUS_FIELD, status) != CC2_STATUS_CMD_MODE) {
 161                 dev_dbg(dev, "Command sent out of command window\n");
 162                 return -ETIMEDOUT;
 163         }
 164
 165         resp = FIELD_GET(CC2_RESPONSE_FIELD, status);
 166         switch (resp) {
 167         case CC2_RESPONSE_ACK:
 168                 return 0;
 169         case CC2_RESPONSE_BUSY:
 170                 return -EBUSY;
 171         case CC2_RESPONSE_NACK:
 172                 if (resp & CC2_ERR_CORR_EEPROM)
 173                         dev_dbg(dev, "Command failed: corrected EEPROM\n");
 174                 if (resp & CC2_ERR_UNCORR_EEPROM)
 175                         dev_dbg(dev, "Command failed: uncorrected EEPROM\n");
 176                 if (resp & CC2_ERR_RAM_PARITY)
 177                         dev_dbg(dev, "Command failed: RAM parity\n");
 178                 if (resp & CC2_ERR_RAM_PARITY)
 179                         dev_dbg(dev, "Command failed: configuration error\n");
 180                 return -ENODATA;
 181         default:
 182                 dev_dbg(dev, "Unknown command reply\n");
 183                 return -EINVAL;
 184         }
 185 }
 186
 187 static int cc2_read_command_status(struct i2c_client *client)
 188 {
 189         u8 status;
 190         int ret;
 191
 192         ret = i2c_master_recv(client, &status, 1);
 193         if (ret != 1) {
 194                 ret = ret < 0 ? ret : -EIO;
 195                 return ret;
 196         }
 197
 198         return cc2_cmd_response_diagnostic(&client->dev, status);
 199 }
 200
 201 /*
 202  * The command mode is only accessible after sending the START_CM command in the
 203  * first 10 ms after power-up. Only in case the command window is missed,
 204  * CC2_CM_RETRIES retries are attempted before giving up and returning an error.
 205  */
 206 static int cc2_command_mode_start(struct cc2_data *data)
 207 {
 208         unsigned long timeout;
 209         int i, ret;
 210
 211         for (i = 0; i < CC2_CM_RETRIES; i++) {
 212                 ret = cc2_enable(data);
 213                 if (ret < 0)
 214                         return ret;
 215
 216                 ret = i2c_smbus_write_word_data(data->client, CC2_START_CM, 0);
 217                 if (ret < 0)
 218                         return ret;
 219
 220                 if (data->irq_ready > 0) {
 221                         timeout = usecs_to_jiffies(2 * CC2_RESP_START_CM_US);
 222                         ret = wait_for_completion_timeout(&data->complete,
 223                                                           timeout);
 224                         if (!ret)
 225                                 return -ETIMEDOUT;
 226                 } else {
 227                         usleep_range(CC2_RESP_START_CM_US,
 228                                      2 * CC2_RESP_START_CM_US);
 229                 }
 230                 ret = cc2_read_command_status(data->client);
 231                 if (ret != -ETIMEDOUT || i == CC2_CM_RETRIES)
 232                         break;
 233
 234                 /* command window missed, prepare for a retry */
 235                 cc2_disable(data);
 236                 msleep(CC2_POWER_CYCLE_MS);
 237         }
 238
 239         return ret;
 240 }
 241
 242 /* Sending a Start_NOM command finishes the command mode immediately with no
 243  * reply and the device enters normal operation mode
 244  */
 245 static int cc2_command_mode_finish(struct cc2_data *data)
 246 {
 247         int ret;
 248
 249         ret = i2c_smbus_write_word_data(data->client, CC2_START_NOM, 0);
 250         if (ret < 0)
 251                 return ret;
 252
 253         return 0;
 254 }
 255
 256 static int cc2_write_reg(struct cc2_data *data, u8 reg, u16 val)
 257 {
 258         unsigned long timeout;
 259         int ret;
 260
 261         ret = cc2_command_mode_start(data);
 262         if (ret < 0)
 263                 goto disable;
 264
 265         cpu_to_be16s(&val);
 266         ret = i2c_smbus_write_word_data(data->client, reg, val);
 267         if (ret < 0)
 268                 goto disable;
 269
 270         if (data->irq_ready > 0) {
 271                 timeout = msecs_to_jiffies(2 * CC2_RESP_EEPROM_W_MS);
 272                 ret = wait_for_completion_timeout(&data->complete, timeout);
 273                 if (!ret) {
 274                         ret = -ETIMEDOUT;
 275                         goto disable;
 276                 }
 277         } else {
 278                 msleep(CC2_RESP_EEPROM_W_MS);
 279         }
 280
 281         ret = cc2_read_command_status(data->client);
 282
 283 disable:
 284         cc2_disable(data);
 285
 286         return ret;
 287 }
 288
 289 static int cc2_read_reg(struct cc2_data *data, u8 reg, u16 *val)
 290 {
 291         u8 buf[CC2_EEPROM_DATA_LEN];
 292         unsigned long timeout;
 293         int ret;
 294
 295         ret = cc2_command_mode_start(data);
 296         if (ret < 0)
 297                 return ret;
 298
 299         ret = i2c_smbus_write_word_data(data->client, reg, 0);
 300         if (ret < 0)
 301                 return ret;
 302
 303         if (data->irq_ready > 0) {
 304                 timeout = usecs_to_jiffies(2 * CC2_RESP_EEPROM_R_US);
 305                 ret = wait_for_completion_timeout(&data->complete, timeout);
 306                 if (!ret)
 307                         return -ETIMEDOUT;
 308
 309         } else {
 310                 usleep_range(CC2_RESP_EEPROM_R_US, CC2_RESP_EEPROM_R_US + 10);
 311         }
 312         ret = i2c_master_recv(data->client, buf, CC2_EEPROM_DATA_LEN);
 313         if (ret != CC2_EEPROM_DATA_LEN)
 314                 return ret < 0 ? ret : -EIO;
 315
 316         *val = be16_to_cpup((__be16 *)&buf[1]);
 317
 318         return cc2_read_command_status(data->client);
 319 }
 320
 321 static int cc2_get_reg_val(struct cc2_data *data, u8 reg, long *val)
 322 {
 323         u16 reg_val;
 324         int ret;
 325
 326         ret = cc2_read_reg(data, reg, &reg_val);
 327         if (!ret)
 328                 *val = cc2_rh_convert(reg_val);
 329
 330         cc2_disable(data);
 331
 332         return ret;
 333 }
 334
 335 static int cc2_data_fetch(struct i2c_client *client,
 336                           enum hwmon_sensor_types type, long *val)
 337 {
 338         u8 data[CC2_MEASUREMENT_DATA_LEN];
 339         u8 status;
 340         int ret;
 341
 342         ret = i2c_master_recv(client, data, CC2_MEASUREMENT_DATA_LEN);
 343         if (ret != CC2_MEASUREMENT_DATA_LEN) {
 344                 ret = ret < 0 ? ret : -EIO;
 345                 return ret;
 346         }
 347         status = FIELD_GET(CC2_STATUS_FIELD, data[0]);
 348         if (status == CC2_STATUS_STALE_DATA)
 349                 return -EBUSY;
 350
 351         if (status != CC2_STATUS_VALID_DATA)
 352                 return -EIO;
 353
 354         switch (type) {
 355         case hwmon_humidity:
 356                 *val = cc2_rh_convert(be16_to_cpup((__be16 *)&data[0]));
 357                 break;
 358         case hwmon_temp:
 359                 *val = cc2_temp_convert(be16_to_cpup((__be16 *)&data[2]));
 360                 break;
 361         default:
 362                 return -EINVAL;
 363         }
 364
 365         return 0;
 366 }
 367
 368 static int cc2_read_measurement(struct cc2_data *data,
 369                                 enum hwmon_sensor_types type, long *val)
 370 {
 371         unsigned long timeout;
 372         int ret;
 373
 374         if (data->irq_ready > 0) {
 375                 timeout = msecs_to_jiffies(CC2_STARTUP_TO_DATA_MS * 2);
 376                 ret = wait_for_completion_timeout(&data->complete, timeout);
 377                 if (!ret)
 378                         return -ETIMEDOUT;
 379
 380         } else {
 381                 msleep(CC2_STARTUP_TO_DATA_MS);
 382         }
 383
 384         ret = cc2_data_fetch(data->client, type, val);
 385
 386         return ret;
 387 }
 388
 389 /*
 390  * A measurement requires enabling the device, waiting for the automatic
 391  * measurement to finish, reading the measurement data and disabling the device
 392  * again.
 393  */
 394 static int cc2_measurement(struct cc2_data *data, enum hwmon_sensor_types type,
 395                            long *val)
 396 {
 397         int ret;
 398
 399         ret = cc2_enable(data);
 400         if (ret)
 401                 return ret;
 402
 403         ret = cc2_read_measurement(data, type, val);
 404
 405         cc2_disable(data);
 406
 407         return ret;
 408 }
 409
 410 /*
 411  * In order to check alarm status, the corresponding ALARM_OFF (hysteresis)
 412  * register must be read and a new measurement must be carried out to trigger
 413  * the alarm signals. Given that the device carries out a measurement after
 414  * exiting the command mode, there is no need to force two power-up sequences.
 415  * Instead, a NOM command is sent and the device is disabled after the
 416  * measurement is read.
 417  */
 418 static int cc2_read_hyst_and_measure(struct cc2_data *data, u8 reg,
 419                                      long *hyst, long *measurement)
 420 {
 421         u16 reg_val;
 422         int ret;
 423
 424         ret = cc2_read_reg(data, reg, &reg_val);
 425         if (ret)
 426                 goto disable;
 427
 428         *hyst = cc2_rh_convert(reg_val);
 429
 430         ret = cc2_command_mode_finish(data);
 431         if (ret)
 432                 goto disable;
 433
 434         ret = cc2_read_measurement(data, hwmon_humidity, measurement);
 435
 436 disable:
 437         cc2_disable(data);
 438
 439         return ret;
 440 }
 441
 442 static umode_t cc2_is_visible(const void *data, enum hwmon_sensor_types type,
 443                               u32 attr, int channel)
 444 {
 445         const struct cc2_data *cc2 = data;
 446
 447         switch (type) {
 448         case hwmon_humidity:
 449                 switch (attr) {
 450                 case hwmon_humidity_input:
 451                         return 0444;
 452                 case hwmon_humidity_min_alarm:
 453                         return cc2->rh_alarm.low_alarm_visible ? 0444 : 0;
 454                 case hwmon_humidity_max_alarm:
 455                         return cc2->rh_alarm.high_alarm_visible ? 0444 : 0;
 456                 case hwmon_humidity_min:
 457                 case hwmon_humidity_min_hyst:
 458                         return cc2->rh_alarm.low_alarm_visible ? 0644 : 0;
 459                 case hwmon_humidity_max:
 460                 case hwmon_humidity_max_hyst:
 461                         return cc2->rh_alarm.high_alarm_visible ? 0644 : 0;
 462                 default:
 463                         return 0;
 464                 }
 465         case hwmon_temp:
 466                 switch (attr) {
 467                 case hwmon_temp_input:
 468                         return 0444;
 469                 default:
 470                         return 0;
 471                 }
 472         default:
 473                 break;
 474         }
 475
 476         return 0;
 477 }
 478
 479 static irqreturn_t cc2_ready_interrupt(int irq, void *data)
 480 {
 481         struct cc2_data *cc2 = data;
 482
 483         if (cc2->process_irqs)
 484                 complete(&cc2->complete);
 485
 486         return IRQ_HANDLED;
 487 }
 488
 489 static irqreturn_t cc2_low_interrupt(int irq, void *data)
 490 {
 491         struct cc2_data *cc2 = data;
 492
 493         if (cc2->process_irqs) {
 494                 hwmon_notify_event(cc2->hwmon, hwmon_humidity,
 495                                    hwmon_humidity_min_alarm, CC2_CHAN_HUMIDITY);
 496                 cc2->rh_alarm.low_alarm = true;
 497         }
 498
 499         return IRQ_HANDLED;
 500 }
 501
 502 static irqreturn_t cc2_high_interrupt(int irq, void *data)
 503 {
 504         struct cc2_data *cc2 = data;
 505
 506         if (cc2->process_irqs) {
 507                 hwmon_notify_event(cc2->hwmon, hwmon_humidity,
 508                                    hwmon_humidity_max_alarm, CC2_CHAN_HUMIDITY);
 509                 cc2->rh_alarm.high_alarm = true;
 510         }
 511
 512         return IRQ_HANDLED;
 513 }
 514
 515 static int cc2_humidity_min_alarm_status(struct cc2_data *data, long *val)
 516 {
 517         long measurement, min_hyst;
 518         int ret;
 519
 520         ret = cc2_read_hyst_and_measure(data, CC2_R_ALARM_L_OFF, &min_hyst,
 521                                         &measurement);
 522         if (ret < 0)
 523                 return ret;
 524
 525         if (data->rh_alarm.low_alarm) {
 526                 *val = (measurement < min_hyst) ? 1 : 0;
 527                 data->rh_alarm.low_alarm = *val;
 528         } else {
 529                 *val = 0;
 530         }
 531
 532         return 0;
 533 }
 534
 535 static int cc2_humidity_max_alarm_status(struct cc2_data *data, long *val)
 536 {
 537         long measurement, max_hyst;
 538         int ret;
 539
 540         ret = cc2_read_hyst_and_measure(data, CC2_R_ALARM_H_OFF, &max_hyst,
 541                                         &measurement);
 542         if (ret < 0)
 543                 return ret;
 544
 545         if (data->rh_alarm.high_alarm) {
 546                 *val = (measurement > max_hyst) ? 1 : 0;
 547                 data->rh_alarm.high_alarm = *val;
 548         } else {
 549                 *val = 0;
 550         }
 551
 552         return 0;
 553 }
 554
 555 static int cc2_read(struct device *dev, enum hwmon_sensor_types type, u32 attr,
 556                     int channel, long *val)
 557 {
 558         struct cc2_data *data = dev_get_drvdata(dev);
 559         int ret = 0;
 560
 561         mutex_lock(&data->dev_access_lock);
 562
 563         switch (type) {
 564         case hwmon_temp:
 565                 ret = cc2_measurement(data, type, val);
 566                 break;
 567         case hwmon_humidity:
 568                 switch (attr) {
 569                 case hwmon_humidity_input:
 570                         ret = cc2_measurement(data, type, val);
 571                         break;
 572                 case hwmon_humidity_min:
 573                         ret = cc2_get_reg_val(data, CC2_R_ALARM_L_ON, val);
 574                         break;
 575                 case hwmon_humidity_min_hyst:
 576                         ret = cc2_get_reg_val(data, CC2_R_ALARM_L_OFF, val);
 577                         break;
 578                 case hwmon_humidity_max:
 579                         ret = cc2_get_reg_val(data, CC2_R_ALARM_H_ON, val);
 580                         break;
 581                 case hwmon_humidity_max_hyst:
 582                         ret = cc2_get_reg_val(data, CC2_R_ALARM_H_OFF, val);
 583                         break;
 584                 case hwmon_humidity_min_alarm:
 585                         ret = cc2_humidity_min_alarm_status(data, val);
 586                         break;
 587                 case hwmon_humidity_max_alarm:
 588                         ret = cc2_humidity_max_alarm_status(data, val);
 589                         break;
 590                 default:
 591                         ret = -EOPNOTSUPP;
 592                 }
 593                 break;
 594         default:
 595                 ret = -EOPNOTSUPP;
 596         }
 597
 598         mutex_unlock(&data->dev_access_lock);
 599
 600         return ret;
 601 }
 602
 603 static int cc2_write(struct device *dev, enum hwmon_sensor_types type, u32 attr,
 604                      int channel, long val)
 605 {
 606         struct cc2_data *data = dev_get_drvdata(dev);
 607         int ret;
 608         u16 arg;
 609         u8 cmd;
 610
 611         if (type != hwmon_humidity)
 612                 return -EOPNOTSUPP;
 613
 614         if (val < 0 || val > CC2_RH_MAX)
 615                 return -EINVAL;
 616
 617         mutex_lock(&data->dev_access_lock);
 618
 619         switch (attr) {
 620         case hwmon_humidity_min:
 621                 cmd = CC2_W_ALARM_L_ON;
 622                 arg = cc2_rh_to_reg(val);
 623                 ret = cc2_write_reg(data, cmd, arg);
 624                 break;
 625
 626         case hwmon_humidity_min_hyst:
 627                 cmd = CC2_W_ALARM_L_OFF;
 628                 arg = cc2_rh_to_reg(val);
 629                 ret = cc2_write_reg(data, cmd, arg);
 630                 break;
 631
 632         case hwmon_humidity_max:
 633                 cmd = CC2_W_ALARM_H_ON;
 634                 arg = cc2_rh_to_reg(val);
 635                 ret = cc2_write_reg(data, cmd, arg);
 636                 break;
 637
 638         case hwmon_humidity_max_hyst:
 639                 cmd = CC2_W_ALARM_H_OFF;
 640                 arg = cc2_rh_to_reg(val);
 641                 ret = cc2_write_reg(data, cmd, arg);
 642                 break;
 643
 644         default:
 645                 ret = -EOPNOTSUPP;
 646                 break;
 647         }
 648
 649         mutex_unlock(&data->dev_access_lock);
 650
 651         return ret;
 652 }
 653
 654 static int cc2_request_ready_irq(struct cc2_data *data, struct device *dev)
 655 {
 656         int ret = 0;
 657
 658         data->irq_ready = fwnode_irq_get_byname(dev_fwnode(dev), "ready");
 659         if (data->irq_ready > 0) {
 660                 init_completion(&data->complete);
 661                 ret = devm_request_threaded_irq(dev, data->irq_ready, NULL,
 662                                                 cc2_ready_interrupt,
 663                                                 IRQF_ONESHOT |
 664                                                 IRQF_TRIGGER_RISING,
 665                                                 dev_name(dev), data);
 666         }
 667
 668         return ret;
 669 }
 670
 671 static int cc2_request_alarm_irqs(struct cc2_data *data, struct device *dev)
 672 {
 673         int ret = 0;
 674
 675         data->irq_low = fwnode_irq_get_byname(dev_fwnode(dev), "low");
 676         if (data->irq_low > 0) {
 677                 ret = devm_request_threaded_irq(dev, data->irq_low, NULL,
 678                                                 cc2_low_interrupt,
 679                                                 IRQF_ONESHOT |
 680                                                 IRQF_TRIGGER_RISING,
 681                                                 dev_name(dev), data);
 682                 if (ret)
 683                         return ret;
 684
 685                 data->rh_alarm.low_alarm_visible = true;
 686         }
 687
 688         data->irq_high = fwnode_irq_get_byname(dev_fwnode(dev), "high");
 689         if (data->irq_high > 0) {
 690                 ret = devm_request_threaded_irq(dev, data->irq_high, NULL,
 691                                                 cc2_high_interrupt,
 692                                                 IRQF_ONESHOT |
 693                                                 IRQF_TRIGGER_RISING,
 694                                                 dev_name(dev), data);
 695                 if (ret)
 696                         return ret;
 697
 698                 data->rh_alarm.high_alarm_visible = true;
 699         }
 700
 701         return ret;
 702 }
 703
 704 static const struct hwmon_channel_info *cc2_info[] = {
 705         HWMON_CHANNEL_INFO(temp, HWMON_T_INPUT),
 706         HWMON_CHANNEL_INFO(humidity, HWMON_H_INPUT | HWMON_H_MIN | HWMON_H_MAX |
 707                            HWMON_H_MIN_HYST | HWMON_H_MAX_HYST |
 708                            HWMON_H_MIN_ALARM | HWMON_H_MAX_ALARM),
 709         NULL
 710 };
 711
 712 static const struct hwmon_ops cc2_hwmon_ops = {
 713         .is_visible = cc2_is_visible,
 714         .read = cc2_read,
 715         .write = cc2_write,
 716 };
 717
 718 static const struct hwmon_chip_info cc2_chip_info = {
 719         .ops = &cc2_hwmon_ops,
 720         .info = cc2_info,
 721 };
 722
 723 static int cc2_probe(struct i2c_client *client)
 724 {
 725         struct cc2_data *data;
 726         struct device *dev = &client->dev;
 727         int ret;
 728
 729         if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C))
 730                 return -EOPNOTSUPP;
 731
 732         data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
 733         if (!data)
 734                 return -ENOMEM;
 735
 736         i2c_set_clientdata(client, data);
 737
 738         mutex_init(&data->dev_access_lock);
 739
 740         data->client = client;
 741
 742         data->regulator = devm_regulator_get_exclusive(dev, "vdd");
 743         if (IS_ERR(data->regulator)) {
 744                 dev_err_probe(dev, PTR_ERR(data->regulator),
 745                               "Failed to get regulator\n");
 746                 return PTR_ERR(data->regulator);
 747         }
 748
 749         ret = cc2_request_ready_irq(data, dev);
 750         if (ret) {
 751                 dev_err_probe(dev, ret, "Failed to request ready irq\n");
 752                 return ret;
 753         }
 754
 755         ret = cc2_request_alarm_irqs(data, dev);
 756         if (ret) {
 757                 dev_err_probe(dev, ret, "Failed to request alarm irqs\n");
 758                 goto disable;
 759         }
 760
 761         data->hwmon = devm_hwmon_device_register_with_info(dev, client->name,
 762                                                            data, &cc2_chip_info,
 763                                                            NULL);
 764         if (IS_ERR(data->hwmon)) {
 765                 dev_err_probe(dev, PTR_ERR(data->hwmon),
 766                               "Failed to register hwmon device\n");
 767                 ret = PTR_ERR(data->hwmon);
 768         }
 769
 770 disable:
 771         cc2_disable(data);
 772
 773         return ret;
 774 }
 775
 776 static void cc2_remove(struct i2c_client *client)
 777 {
 778         struct cc2_data *data = i2c_get_clientdata(client);
 779
 780         cc2_disable(data);
 781 }
 782
 783 static const struct i2c_device_id cc2_id[] = {
 784         { "cc2d23" },
 785         { "cc2d23s" },
 786         { "cc2d25" },
 787         { "cc2d25s" },
 788         { "cc2d33" },
 789         { "cc2d33s" },
 790         { "cc2d35" },
 791         { "cc2d35s" },
 792         { }
 793 };
 794 MODULE_DEVICE_TABLE(i2c, cc2_id);
 795
 796 static const struct of_device_id cc2_of_match[] = {
 797         { .compatible = "amphenol,cc2d23" },
 798         { .compatible = "amphenol,cc2d23s" },
 799         { .compatible = "amphenol,cc2d25" },
 800         { .compatible = "amphenol,cc2d25s" },
 801         { .compatible = "amphenol,cc2d33" },
 802         { .compatible = "amphenol,cc2d33s" },
 803         { .compatible = "amphenol,cc2d35" },
 804         { .compatible = "amphenol,cc2d35s" },
 805         { },
 806 };
 807 MODULE_DEVICE_TABLE(of, cc2_of_match);
 808
 809 static struct i2c_driver cc2_driver = {
 810         .driver = {
 811                 .name   = "cc2d23",
 812                 .of_match_table = cc2_of_match,
 813         },
 814         .probe          = cc2_probe,
 815         .remove         = cc2_remove,
 816         .id_table = cc2_id,
 817 };
 818 module_i2c_driver(cc2_driver);
 819
 820 MODULE_AUTHOR("Javier Carrasco <[email protected]>");
 821 MODULE_DESCRIPTION("Amphenol ChipCap 2 humidity and temperature sensor driver");
 822 MODULE_LICENSE("GPL");