1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * tmp007.c - Support for TI TMP007 IR thermopile sensor with integrated math engine 4 * 5 * Copyright (c) 2017 Manivannan Sadhasivam <manivannanece23@gmail.com> 6 * 7 * Driver for the Texas Instruments I2C 16-bit IR thermopile sensor 8 * 9 * (7-bit I2C slave address (0x40 - 0x47), changeable via ADR pins) 10 * 11 * Note: 12 * 1. This driver assumes that the sensor has been calibrated beforehand 13 * 2. Limit threshold events are enabled at the start 14 * 3. Operating mode: INT 15 */ 16 17 #include <linux/err.h> 18 #include <linux/i2c.h> 19 #include <linux/delay.h> 20 #include <linux/module.h> 21 #include <linux/pm.h> 22 #include <linux/bitops.h> 23 #include <linux/of.h> 24 #include <linux/irq.h> 25 #include <linux/interrupt.h> 26 27 #include <linux/iio/iio.h> 28 #include <linux/iio/sysfs.h> 29 #include <linux/iio/events.h> 30 31 #define TMP007_TDIE 0x01 32 #define TMP007_CONFIG 0x02 33 #define TMP007_TOBJECT 0x03 34 #define TMP007_STATUS 0x04 35 #define TMP007_STATUS_MASK 0x05 36 #define TMP007_TOBJ_HIGH_LIMIT 0x06 37 #define TMP007_TOBJ_LOW_LIMIT 0x07 38 #define TMP007_TDIE_HIGH_LIMIT 0x08 39 #define TMP007_TDIE_LOW_LIMIT 0x09 40 #define TMP007_MANUFACTURER_ID 0x1e 41 #define TMP007_DEVICE_ID 0x1f 42 43 #define TMP007_CONFIG_CONV_EN BIT(12) 44 #define TMP007_CONFIG_TC_EN BIT(6) 45 #define TMP007_CONFIG_CR_MASK GENMASK(11, 9) 46 #define TMP007_CONFIG_ALERT_EN BIT(8) 47 #define TMP007_CONFIG_CR_SHIFT 9 48 49 /* Status register flags */ 50 #define TMP007_STATUS_ALERT BIT(15) 51 #define TMP007_STATUS_CONV_READY BIT(14) 52 #define TMP007_STATUS_OHF BIT(13) 53 #define TMP007_STATUS_OLF BIT(12) 54 #define TMP007_STATUS_LHF BIT(11) 55 #define TMP007_STATUS_LLF BIT(10) 56 #define TMP007_STATUS_DATA_VALID BIT(9) 57 58 #define TMP007_MANUFACTURER_MAGIC 0x5449 59 #define TMP007_DEVICE_MAGIC 0x0078 60 61 #define TMP007_TEMP_SHIFT 2 62 63 struct tmp007_data { 64 struct i2c_client *client; 65 struct mutex lock; 66 u16 config; 67 u16 status_mask; 68 }; 69 70 static const int tmp007_avgs[5][2] = { {4, 0}, {2, 0}, {1, 0}, 71 {0, 500000}, {0, 250000} }; 72 73 static int tmp007_read_temperature(struct tmp007_data *data, u8 reg) 74 { 75 s32 ret; 76 int tries = 50; 77 78 while (tries-- > 0) { 79 ret = i2c_smbus_read_word_swapped(data->client, 80 TMP007_STATUS); 81 if (ret < 0) 82 return ret; 83 if ((ret & TMP007_STATUS_CONV_READY) && 84 !(ret & TMP007_STATUS_DATA_VALID)) 85 break; 86 msleep(100); 87 } 88 89 if (tries < 0) 90 return -EIO; 91 92 return i2c_smbus_read_word_swapped(data->client, reg); 93 } 94 95 static int tmp007_powerdown(struct tmp007_data *data) 96 { 97 return i2c_smbus_write_word_swapped(data->client, TMP007_CONFIG, 98 data->config & ~TMP007_CONFIG_CONV_EN); 99 } 100 101 static int tmp007_read_raw(struct iio_dev *indio_dev, 102 struct iio_chan_spec const *channel, int *val, 103 int *val2, long mask) 104 { 105 struct tmp007_data *data = iio_priv(indio_dev); 106 s32 ret; 107 int conv_rate; 108 109 switch (mask) { 110 case IIO_CHAN_INFO_RAW: 111 switch (channel->channel2) { 112 case IIO_MOD_TEMP_AMBIENT: /* LSB: 0.03125 degree Celsius */ 113 ret = i2c_smbus_read_word_swapped(data->client, TMP007_TDIE); 114 if (ret < 0) 115 return ret; 116 break; 117 case IIO_MOD_TEMP_OBJECT: 118 ret = tmp007_read_temperature(data, TMP007_TOBJECT); 119 if (ret < 0) 120 return ret; 121 break; 122 default: 123 return -EINVAL; 124 } 125 126 *val = sign_extend32(ret, 15) >> TMP007_TEMP_SHIFT; 127 128 return IIO_VAL_INT; 129 case IIO_CHAN_INFO_SCALE: 130 *val = 31; 131 *val2 = 250000; 132 133 return IIO_VAL_INT_PLUS_MICRO; 134 case IIO_CHAN_INFO_SAMP_FREQ: 135 conv_rate = (data->config & TMP007_CONFIG_CR_MASK) 136 >> TMP007_CONFIG_CR_SHIFT; 137 *val = tmp007_avgs[conv_rate][0]; 138 *val2 = tmp007_avgs[conv_rate][1]; 139 140 return IIO_VAL_INT_PLUS_MICRO; 141 default: 142 return -EINVAL; 143 } 144 } 145 146 static int tmp007_write_raw(struct iio_dev *indio_dev, 147 struct iio_chan_spec const *channel, int val, 148 int val2, long mask) 149 { 150 struct tmp007_data *data = iio_priv(indio_dev); 151 int i; 152 u16 tmp; 153 154 if (mask == IIO_CHAN_INFO_SAMP_FREQ) { 155 for (i = 0; i < ARRAY_SIZE(tmp007_avgs); i++) { 156 if ((val == tmp007_avgs[i][0]) && 157 (val2 == tmp007_avgs[i][1])) { 158 tmp = data->config & ~TMP007_CONFIG_CR_MASK; 159 tmp |= (i << TMP007_CONFIG_CR_SHIFT); 160 161 return i2c_smbus_write_word_swapped(data->client, 162 TMP007_CONFIG, 163 data->config = tmp); 164 } 165 } 166 } 167 168 return -EINVAL; 169 } 170 171 static irqreturn_t tmp007_interrupt_handler(int irq, void *private) 172 { 173 struct iio_dev *indio_dev = private; 174 struct tmp007_data *data = iio_priv(indio_dev); 175 int ret; 176 177 ret = i2c_smbus_read_word_swapped(data->client, TMP007_STATUS); 178 if ((ret < 0) || !(ret & (TMP007_STATUS_OHF | TMP007_STATUS_OLF | 179 TMP007_STATUS_LHF | TMP007_STATUS_LLF))) 180 return IRQ_NONE; 181 182 if (ret & TMP007_STATUS_OHF) 183 iio_push_event(indio_dev, 184 IIO_MOD_EVENT_CODE(IIO_TEMP, 0, 185 IIO_MOD_TEMP_OBJECT, 186 IIO_EV_TYPE_THRESH, 187 IIO_EV_DIR_RISING), 188 iio_get_time_ns(indio_dev)); 189 190 if (ret & TMP007_STATUS_OLF) 191 iio_push_event(indio_dev, 192 IIO_MOD_EVENT_CODE(IIO_TEMP, 0, 193 IIO_MOD_TEMP_OBJECT, 194 IIO_EV_TYPE_THRESH, 195 IIO_EV_DIR_FALLING), 196 iio_get_time_ns(indio_dev)); 197 198 if (ret & TMP007_STATUS_LHF) 199 iio_push_event(indio_dev, 200 IIO_MOD_EVENT_CODE(IIO_TEMP, 0, 201 IIO_MOD_TEMP_AMBIENT, 202 IIO_EV_TYPE_THRESH, 203 IIO_EV_DIR_RISING), 204 iio_get_time_ns(indio_dev)); 205 206 if (ret & TMP007_STATUS_LLF) 207 iio_push_event(indio_dev, 208 IIO_MOD_EVENT_CODE(IIO_TEMP, 0, 209 IIO_MOD_TEMP_AMBIENT, 210 IIO_EV_TYPE_THRESH, 211 IIO_EV_DIR_FALLING), 212 iio_get_time_ns(indio_dev)); 213 214 return IRQ_HANDLED; 215 } 216 217 static int tmp007_write_event_config(struct iio_dev *indio_dev, 218 const struct iio_chan_spec *chan, enum iio_event_type type, 219 enum iio_event_direction dir, int state) 220 { 221 struct tmp007_data *data = iio_priv(indio_dev); 222 unsigned int status_mask; 223 int ret; 224 225 switch (chan->channel2) { 226 case IIO_MOD_TEMP_AMBIENT: 227 if (dir == IIO_EV_DIR_RISING) 228 status_mask = TMP007_STATUS_LHF; 229 else 230 status_mask = TMP007_STATUS_LLF; 231 break; 232 case IIO_MOD_TEMP_OBJECT: 233 if (dir == IIO_EV_DIR_RISING) 234 status_mask = TMP007_STATUS_OHF; 235 else 236 status_mask = TMP007_STATUS_OLF; 237 break; 238 default: 239 return -EINVAL; 240 } 241 242 mutex_lock(&data->lock); 243 ret = i2c_smbus_read_word_swapped(data->client, TMP007_STATUS_MASK); 244 mutex_unlock(&data->lock); 245 if (ret < 0) 246 return ret; 247 248 if (state) 249 ret |= status_mask; 250 else 251 ret &= ~status_mask; 252 253 return i2c_smbus_write_word_swapped(data->client, TMP007_STATUS_MASK, 254 data->status_mask = ret); 255 } 256 257 static int tmp007_read_event_config(struct iio_dev *indio_dev, 258 const struct iio_chan_spec *chan, enum iio_event_type type, 259 enum iio_event_direction dir) 260 { 261 struct tmp007_data *data = iio_priv(indio_dev); 262 unsigned int mask; 263 264 switch (chan->channel2) { 265 case IIO_MOD_TEMP_AMBIENT: 266 if (dir == IIO_EV_DIR_RISING) 267 mask = TMP007_STATUS_LHF; 268 else 269 mask = TMP007_STATUS_LLF; 270 break; 271 case IIO_MOD_TEMP_OBJECT: 272 if (dir == IIO_EV_DIR_RISING) 273 mask = TMP007_STATUS_OHF; 274 else 275 mask = TMP007_STATUS_OLF; 276 break; 277 default: 278 return -EINVAL; 279 } 280 281 return !!(data->status_mask & mask); 282 } 283 284 static int tmp007_read_thresh(struct iio_dev *indio_dev, 285 const struct iio_chan_spec *chan, enum iio_event_type type, 286 enum iio_event_direction dir, enum iio_event_info info, 287 int *val, int *val2) 288 { 289 struct tmp007_data *data = iio_priv(indio_dev); 290 int ret; 291 u8 reg; 292 293 switch (chan->channel2) { 294 case IIO_MOD_TEMP_AMBIENT: /* LSB: 0.5 degree Celsius */ 295 if (dir == IIO_EV_DIR_RISING) 296 reg = TMP007_TDIE_HIGH_LIMIT; 297 else 298 reg = TMP007_TDIE_LOW_LIMIT; 299 break; 300 case IIO_MOD_TEMP_OBJECT: 301 if (dir == IIO_EV_DIR_RISING) 302 reg = TMP007_TOBJ_HIGH_LIMIT; 303 else 304 reg = TMP007_TOBJ_LOW_LIMIT; 305 break; 306 default: 307 return -EINVAL; 308 } 309 310 ret = i2c_smbus_read_word_swapped(data->client, reg); 311 if (ret < 0) 312 return ret; 313 314 /* Shift length 7 bits = 6(15:6) + 1(0.5 LSB) */ 315 *val = sign_extend32(ret, 15) >> 7; 316 317 return IIO_VAL_INT; 318 } 319 320 static int tmp007_write_thresh(struct iio_dev *indio_dev, 321 const struct iio_chan_spec *chan, enum iio_event_type type, 322 enum iio_event_direction dir, enum iio_event_info info, 323 int val, int val2) 324 { 325 struct tmp007_data *data = iio_priv(indio_dev); 326 u8 reg; 327 328 switch (chan->channel2) { 329 case IIO_MOD_TEMP_AMBIENT: 330 if (dir == IIO_EV_DIR_RISING) 331 reg = TMP007_TDIE_HIGH_LIMIT; 332 else 333 reg = TMP007_TDIE_LOW_LIMIT; 334 break; 335 case IIO_MOD_TEMP_OBJECT: 336 if (dir == IIO_EV_DIR_RISING) 337 reg = TMP007_TOBJ_HIGH_LIMIT; 338 else 339 reg = TMP007_TOBJ_LOW_LIMIT; 340 break; 341 default: 342 return -EINVAL; 343 } 344 345 /* Full scale threshold value is +/- 256 degree Celsius */ 346 if (val < -256 || val > 255) 347 return -EINVAL; 348 349 /* Shift length 7 bits = 6(15:6) + 1(0.5 LSB) */ 350 return i2c_smbus_write_word_swapped(data->client, reg, (val << 7)); 351 } 352 353 static IIO_CONST_ATTR(sampling_frequency_available, "4 2 1 0.5 0.25"); 354 355 static struct attribute *tmp007_attributes[] = { 356 &iio_const_attr_sampling_frequency_available.dev_attr.attr, 357 NULL 358 }; 359 360 static const struct attribute_group tmp007_attribute_group = { 361 .attrs = tmp007_attributes, 362 }; 363 364 static const struct iio_event_spec tmp007_obj_event[] = { 365 { 366 .type = IIO_EV_TYPE_THRESH, 367 .dir = IIO_EV_DIR_RISING, 368 .mask_separate = BIT(IIO_EV_INFO_VALUE) | 369 BIT(IIO_EV_INFO_ENABLE), 370 }, 371 { 372 .type = IIO_EV_TYPE_THRESH, 373 .dir = IIO_EV_DIR_FALLING, 374 .mask_separate = BIT(IIO_EV_INFO_VALUE) | 375 BIT(IIO_EV_INFO_ENABLE), 376 }, 377 }; 378 379 static const struct iio_event_spec tmp007_die_event[] = { 380 { 381 .type = IIO_EV_TYPE_THRESH, 382 .dir = IIO_EV_DIR_RISING, 383 .mask_separate = BIT(IIO_EV_INFO_VALUE) | 384 BIT(IIO_EV_INFO_ENABLE), 385 }, 386 { 387 .type = IIO_EV_TYPE_THRESH, 388 .dir = IIO_EV_DIR_FALLING, 389 .mask_separate = BIT(IIO_EV_INFO_VALUE) | 390 BIT(IIO_EV_INFO_ENABLE), 391 }, 392 }; 393 394 static const struct iio_chan_spec tmp007_channels[] = { 395 { 396 .type = IIO_TEMP, 397 .modified = 1, 398 .channel2 = IIO_MOD_TEMP_AMBIENT, 399 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | 400 BIT(IIO_CHAN_INFO_SCALE), 401 .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ), 402 .event_spec = tmp007_die_event, 403 .num_event_specs = ARRAY_SIZE(tmp007_die_event), 404 }, 405 { 406 .type = IIO_TEMP, 407 .modified = 1, 408 .channel2 = IIO_MOD_TEMP_OBJECT, 409 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | 410 BIT(IIO_CHAN_INFO_SCALE), 411 .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ), 412 .event_spec = tmp007_obj_event, 413 .num_event_specs = ARRAY_SIZE(tmp007_obj_event), 414 } 415 }; 416 417 static const struct iio_info tmp007_info = { 418 .read_raw = tmp007_read_raw, 419 .write_raw = tmp007_write_raw, 420 .read_event_config = tmp007_read_event_config, 421 .write_event_config = tmp007_write_event_config, 422 .read_event_value = tmp007_read_thresh, 423 .write_event_value = tmp007_write_thresh, 424 .attrs = &tmp007_attribute_group, 425 }; 426 427 static bool tmp007_identify(struct i2c_client *client) 428 { 429 int manf_id, dev_id; 430 431 manf_id = i2c_smbus_read_word_swapped(client, TMP007_MANUFACTURER_ID); 432 if (manf_id < 0) 433 return false; 434 435 dev_id = i2c_smbus_read_word_swapped(client, TMP007_DEVICE_ID); 436 if (dev_id < 0) 437 return false; 438 439 return (manf_id == TMP007_MANUFACTURER_MAGIC && dev_id == TMP007_DEVICE_MAGIC); 440 } 441 442 static int tmp007_probe(struct i2c_client *client, 443 const struct i2c_device_id *tmp007_id) 444 { 445 struct tmp007_data *data; 446 struct iio_dev *indio_dev; 447 int ret; 448 449 if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_WORD_DATA)) 450 return -EOPNOTSUPP; 451 452 if (!tmp007_identify(client)) { 453 dev_err(&client->dev, "TMP007 not found\n"); 454 return -ENODEV; 455 } 456 457 indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data)); 458 if (!indio_dev) 459 return -ENOMEM; 460 461 data = iio_priv(indio_dev); 462 i2c_set_clientdata(client, indio_dev); 463 data->client = client; 464 mutex_init(&data->lock); 465 466 indio_dev->dev.parent = &client->dev; 467 indio_dev->name = "tmp007"; 468 indio_dev->modes = INDIO_DIRECT_MODE; 469 indio_dev->info = &tmp007_info; 470 471 indio_dev->channels = tmp007_channels; 472 indio_dev->num_channels = ARRAY_SIZE(tmp007_channels); 473 474 /* 475 * Set Configuration register: 476 * 1. Conversion ON 477 * 2. ALERT enable 478 * 3. Transient correction enable 479 */ 480 481 ret = i2c_smbus_read_word_swapped(data->client, TMP007_CONFIG); 482 if (ret < 0) 483 return ret; 484 485 data->config = ret; 486 data->config |= (TMP007_CONFIG_CONV_EN | TMP007_CONFIG_ALERT_EN | TMP007_CONFIG_TC_EN); 487 488 ret = i2c_smbus_write_word_swapped(data->client, TMP007_CONFIG, 489 data->config); 490 if (ret < 0) 491 return ret; 492 493 /* 494 * Only the following flags can activate ALERT pin. Data conversion/validity flags 495 * flags can still be polled for getting temperature data 496 * 497 * Set Status Mask register: 498 * 1. Object temperature high limit enable 499 * 2. Object temperature low limit enable 500 * 3. TDIE temperature high limit enable 501 * 4. TDIE temperature low limit enable 502 */ 503 504 ret = i2c_smbus_read_word_swapped(data->client, TMP007_STATUS_MASK); 505 if (ret < 0) 506 goto error_powerdown; 507 508 data->status_mask = ret; 509 data->status_mask |= (TMP007_STATUS_OHF | TMP007_STATUS_OLF 510 | TMP007_STATUS_LHF | TMP007_STATUS_LLF); 511 512 ret = i2c_smbus_write_word_swapped(data->client, TMP007_STATUS_MASK, data->status_mask); 513 if (ret < 0) 514 goto error_powerdown; 515 516 if (client->irq) { 517 ret = devm_request_threaded_irq(&client->dev, client->irq, 518 NULL, tmp007_interrupt_handler, 519 IRQF_TRIGGER_FALLING | IRQF_ONESHOT, 520 tmp007_id->name, indio_dev); 521 if (ret) { 522 dev_err(&client->dev, "irq request error %d\n", -ret); 523 goto error_powerdown; 524 } 525 } 526 527 return iio_device_register(indio_dev); 528 529 error_powerdown: 530 tmp007_powerdown(data); 531 532 return ret; 533 } 534 535 static int tmp007_remove(struct i2c_client *client) 536 { 537 struct iio_dev *indio_dev = i2c_get_clientdata(client); 538 struct tmp007_data *data = iio_priv(indio_dev); 539 540 iio_device_unregister(indio_dev); 541 tmp007_powerdown(data); 542 543 return 0; 544 } 545 546 #ifdef CONFIG_PM_SLEEP 547 static int tmp007_suspend(struct device *dev) 548 { 549 struct tmp007_data *data = iio_priv(i2c_get_clientdata( 550 to_i2c_client(dev))); 551 552 return tmp007_powerdown(data); 553 } 554 555 static int tmp007_resume(struct device *dev) 556 { 557 struct tmp007_data *data = iio_priv(i2c_get_clientdata( 558 to_i2c_client(dev))); 559 560 return i2c_smbus_write_word_swapped(data->client, TMP007_CONFIG, 561 data->config | TMP007_CONFIG_CONV_EN); 562 } 563 #endif 564 565 static SIMPLE_DEV_PM_OPS(tmp007_pm_ops, tmp007_suspend, tmp007_resume); 566 567 static const struct of_device_id tmp007_of_match[] = { 568 { .compatible = "ti,tmp007", }, 569 { }, 570 }; 571 MODULE_DEVICE_TABLE(of, tmp007_of_match); 572 573 static const struct i2c_device_id tmp007_id[] = { 574 { "tmp007", 0 }, 575 { } 576 }; 577 MODULE_DEVICE_TABLE(i2c, tmp007_id); 578 579 static struct i2c_driver tmp007_driver = { 580 .driver = { 581 .name = "tmp007", 582 .of_match_table = of_match_ptr(tmp007_of_match), 583 .pm = &tmp007_pm_ops, 584 }, 585 .probe = tmp007_probe, 586 .remove = tmp007_remove, 587 .id_table = tmp007_id, 588 }; 589 module_i2c_driver(tmp007_driver); 590 591 MODULE_AUTHOR("Manivannan Sadhasivam <manivannanece23@gmail.com>"); 592 MODULE_DESCRIPTION("TI TMP007 IR thermopile sensor driver"); 593 MODULE_LICENSE("GPL"); 594