1 /* 2 * ntc_thermistor.c - NTC Thermistors 3 * 4 * Copyright (C) 2010 Samsung Electronics 5 * MyungJoo Ham <myungjoo.ham@samsung.com> 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License as published by 9 * the Free Software Foundation; either version 2 of the License, or 10 * (at your option) any later version. 11 * 12 * This program is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 * GNU General Public License for more details. 16 * 17 * You should have received a copy of the GNU General Public License 18 * along with this program; if not, write to the Free Software 19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 20 * 21 */ 22 23 #include <linux/slab.h> 24 #include <linux/module.h> 25 #include <linux/pm_runtime.h> 26 #include <linux/math64.h> 27 #include <linux/platform_device.h> 28 #include <linux/err.h> 29 #include <linux/of.h> 30 #include <linux/of_device.h> 31 32 #include <linux/platform_data/ntc_thermistor.h> 33 34 #include <linux/iio/iio.h> 35 #include <linux/iio/machine.h> 36 #include <linux/iio/driver.h> 37 #include <linux/iio/consumer.h> 38 39 #include <linux/hwmon.h> 40 #include <linux/hwmon-sysfs.h> 41 #include <linux/thermal.h> 42 43 struct ntc_compensation { 44 int temp_c; 45 unsigned int ohm; 46 }; 47 48 /* Order matters, ntc_match references the entries by index */ 49 static const struct platform_device_id ntc_thermistor_id[] = { 50 { "ncp15wb473", TYPE_NCPXXWB473 }, 51 { "ncp18wb473", TYPE_NCPXXWB473 }, 52 { "ncp21wb473", TYPE_NCPXXWB473 }, 53 { "ncp03wb473", TYPE_NCPXXWB473 }, 54 { "ncp15wl333", TYPE_NCPXXWL333 }, 55 { "b57330v2103", TYPE_B57330V2103}, 56 { "ncp03wf104", TYPE_NCPXXWF104 }, 57 { }, 58 }; 59 60 /* 61 * A compensation table should be sorted by the values of .ohm 62 * in descending order. 63 * The following compensation tables are from the specification of Murata NTC 64 * Thermistors Datasheet 65 */ 66 static const struct ntc_compensation ncpXXwb473[] = { 67 { .temp_c = -40, .ohm = 1747920 }, 68 { .temp_c = -35, .ohm = 1245428 }, 69 { .temp_c = -30, .ohm = 898485 }, 70 { .temp_c = -25, .ohm = 655802 }, 71 { .temp_c = -20, .ohm = 483954 }, 72 { .temp_c = -15, .ohm = 360850 }, 73 { .temp_c = -10, .ohm = 271697 }, 74 { .temp_c = -5, .ohm = 206463 }, 75 { .temp_c = 0, .ohm = 158214 }, 76 { .temp_c = 5, .ohm = 122259 }, 77 { .temp_c = 10, .ohm = 95227 }, 78 { .temp_c = 15, .ohm = 74730 }, 79 { .temp_c = 20, .ohm = 59065 }, 80 { .temp_c = 25, .ohm = 47000 }, 81 { .temp_c = 30, .ohm = 37643 }, 82 { .temp_c = 35, .ohm = 30334 }, 83 { .temp_c = 40, .ohm = 24591 }, 84 { .temp_c = 45, .ohm = 20048 }, 85 { .temp_c = 50, .ohm = 16433 }, 86 { .temp_c = 55, .ohm = 13539 }, 87 { .temp_c = 60, .ohm = 11209 }, 88 { .temp_c = 65, .ohm = 9328 }, 89 { .temp_c = 70, .ohm = 7798 }, 90 { .temp_c = 75, .ohm = 6544 }, 91 { .temp_c = 80, .ohm = 5518 }, 92 { .temp_c = 85, .ohm = 4674 }, 93 { .temp_c = 90, .ohm = 3972 }, 94 { .temp_c = 95, .ohm = 3388 }, 95 { .temp_c = 100, .ohm = 2902 }, 96 { .temp_c = 105, .ohm = 2494 }, 97 { .temp_c = 110, .ohm = 2150 }, 98 { .temp_c = 115, .ohm = 1860 }, 99 { .temp_c = 120, .ohm = 1615 }, 100 { .temp_c = 125, .ohm = 1406 }, 101 }; 102 static const struct ntc_compensation ncpXXwl333[] = { 103 { .temp_c = -40, .ohm = 1610154 }, 104 { .temp_c = -35, .ohm = 1130850 }, 105 { .temp_c = -30, .ohm = 802609 }, 106 { .temp_c = -25, .ohm = 575385 }, 107 { .temp_c = -20, .ohm = 416464 }, 108 { .temp_c = -15, .ohm = 304219 }, 109 { .temp_c = -10, .ohm = 224193 }, 110 { .temp_c = -5, .ohm = 166623 }, 111 { .temp_c = 0, .ohm = 124850 }, 112 { .temp_c = 5, .ohm = 94287 }, 113 { .temp_c = 10, .ohm = 71747 }, 114 { .temp_c = 15, .ohm = 54996 }, 115 { .temp_c = 20, .ohm = 42455 }, 116 { .temp_c = 25, .ohm = 33000 }, 117 { .temp_c = 30, .ohm = 25822 }, 118 { .temp_c = 35, .ohm = 20335 }, 119 { .temp_c = 40, .ohm = 16115 }, 120 { .temp_c = 45, .ohm = 12849 }, 121 { .temp_c = 50, .ohm = 10306 }, 122 { .temp_c = 55, .ohm = 8314 }, 123 { .temp_c = 60, .ohm = 6746 }, 124 { .temp_c = 65, .ohm = 5503 }, 125 { .temp_c = 70, .ohm = 4513 }, 126 { .temp_c = 75, .ohm = 3721 }, 127 { .temp_c = 80, .ohm = 3084 }, 128 { .temp_c = 85, .ohm = 2569 }, 129 { .temp_c = 90, .ohm = 2151 }, 130 { .temp_c = 95, .ohm = 1809 }, 131 { .temp_c = 100, .ohm = 1529 }, 132 { .temp_c = 105, .ohm = 1299 }, 133 { .temp_c = 110, .ohm = 1108 }, 134 { .temp_c = 115, .ohm = 949 }, 135 { .temp_c = 120, .ohm = 817 }, 136 { .temp_c = 125, .ohm = 707 }, 137 }; 138 139 static const struct ntc_compensation ncpXXwf104[] = { 140 { .temp_c = -40, .ohm = 4397119 }, 141 { .temp_c = -35, .ohm = 3088599 }, 142 { .temp_c = -30, .ohm = 2197225 }, 143 { .temp_c = -25, .ohm = 1581881 }, 144 { .temp_c = -20, .ohm = 1151037 }, 145 { .temp_c = -15, .ohm = 846579 }, 146 { .temp_c = -10, .ohm = 628988 }, 147 { .temp_c = -5, .ohm = 471632 }, 148 { .temp_c = 0, .ohm = 357012 }, 149 { .temp_c = 5, .ohm = 272500 }, 150 { .temp_c = 10, .ohm = 209710 }, 151 { .temp_c = 15, .ohm = 162651 }, 152 { .temp_c = 20, .ohm = 127080 }, 153 { .temp_c = 25, .ohm = 100000 }, 154 { .temp_c = 30, .ohm = 79222 }, 155 { .temp_c = 35, .ohm = 63167 }, 156 { .temp_c = 40, .ohm = 50677 }, 157 { .temp_c = 45, .ohm = 40904 }, 158 { .temp_c = 50, .ohm = 33195 }, 159 { .temp_c = 55, .ohm = 27091 }, 160 { .temp_c = 60, .ohm = 22224 }, 161 { .temp_c = 65, .ohm = 18323 }, 162 { .temp_c = 70, .ohm = 15184 }, 163 { .temp_c = 75, .ohm = 12635 }, 164 { .temp_c = 80, .ohm = 10566 }, 165 { .temp_c = 85, .ohm = 8873 }, 166 { .temp_c = 90, .ohm = 7481 }, 167 { .temp_c = 95, .ohm = 6337 }, 168 { .temp_c = 100, .ohm = 5384 }, 169 { .temp_c = 105, .ohm = 4594 }, 170 { .temp_c = 110, .ohm = 3934 }, 171 { .temp_c = 115, .ohm = 3380 }, 172 { .temp_c = 120, .ohm = 2916 }, 173 { .temp_c = 125, .ohm = 2522 }, 174 }; 175 176 /* 177 * The following compensation table is from the specification of EPCOS NTC 178 * Thermistors Datasheet 179 */ 180 static const struct ntc_compensation b57330v2103[] = { 181 { .temp_c = -40, .ohm = 190030 }, 182 { .temp_c = -35, .ohm = 145360 }, 183 { .temp_c = -30, .ohm = 112060 }, 184 { .temp_c = -25, .ohm = 87041 }, 185 { .temp_c = -20, .ohm = 68104 }, 186 { .temp_c = -15, .ohm = 53665 }, 187 { .temp_c = -10, .ohm = 42576 }, 188 { .temp_c = -5, .ohm = 34001 }, 189 { .temp_c = 0, .ohm = 27326 }, 190 { .temp_c = 5, .ohm = 22096 }, 191 { .temp_c = 10, .ohm = 17973 }, 192 { .temp_c = 15, .ohm = 14703 }, 193 { .temp_c = 20, .ohm = 12090 }, 194 { .temp_c = 25, .ohm = 10000 }, 195 { .temp_c = 30, .ohm = 8311 }, 196 { .temp_c = 35, .ohm = 6941 }, 197 { .temp_c = 40, .ohm = 5825 }, 198 { .temp_c = 45, .ohm = 4911 }, 199 { .temp_c = 50, .ohm = 4158 }, 200 { .temp_c = 55, .ohm = 3536 }, 201 { .temp_c = 60, .ohm = 3019 }, 202 { .temp_c = 65, .ohm = 2588 }, 203 { .temp_c = 70, .ohm = 2227 }, 204 { .temp_c = 75, .ohm = 1924 }, 205 { .temp_c = 80, .ohm = 1668 }, 206 { .temp_c = 85, .ohm = 1451 }, 207 { .temp_c = 90, .ohm = 1266 }, 208 { .temp_c = 95, .ohm = 1108 }, 209 { .temp_c = 100, .ohm = 973 }, 210 { .temp_c = 105, .ohm = 857 }, 211 { .temp_c = 110, .ohm = 757 }, 212 { .temp_c = 115, .ohm = 671 }, 213 { .temp_c = 120, .ohm = 596 }, 214 { .temp_c = 125, .ohm = 531 }, 215 }; 216 217 struct ntc_data { 218 struct device *hwmon_dev; 219 struct ntc_thermistor_platform_data *pdata; 220 const struct ntc_compensation *comp; 221 struct device *dev; 222 int n_comp; 223 char name[PLATFORM_NAME_SIZE]; 224 struct thermal_zone_device *tz; 225 }; 226 227 #if defined(CONFIG_OF) && IS_ENABLED(CONFIG_IIO) 228 static int ntc_adc_iio_read(struct ntc_thermistor_platform_data *pdata) 229 { 230 struct iio_channel *channel = pdata->chan; 231 int raw, uv, ret; 232 233 ret = iio_read_channel_raw(channel, &raw); 234 if (ret < 0) { 235 pr_err("read channel() error: %d\n", ret); 236 return ret; 237 } 238 239 ret = iio_convert_raw_to_processed(channel, raw, &uv, 1000); 240 if (ret < 0) { 241 /* Assume 12 bit ADC with vref at pullup_uv */ 242 uv = (pdata->pullup_uv * (s64)raw) >> 12; 243 } 244 245 return uv; 246 } 247 248 static const struct of_device_id ntc_match[] = { 249 { .compatible = "murata,ncp15wb473", 250 .data = &ntc_thermistor_id[0] }, 251 { .compatible = "murata,ncp18wb473", 252 .data = &ntc_thermistor_id[1] }, 253 { .compatible = "murata,ncp21wb473", 254 .data = &ntc_thermistor_id[2] }, 255 { .compatible = "murata,ncp03wb473", 256 .data = &ntc_thermistor_id[3] }, 257 { .compatible = "murata,ncp15wl333", 258 .data = &ntc_thermistor_id[4] }, 259 { .compatible = "epcos,b57330v2103", 260 .data = &ntc_thermistor_id[5]}, 261 { .compatible = "murata,ncp03wf104", 262 .data = &ntc_thermistor_id[6] }, 263 264 /* Usage of vendor name "ntc" is deprecated */ 265 { .compatible = "ntc,ncp15wb473", 266 .data = &ntc_thermistor_id[0] }, 267 { .compatible = "ntc,ncp18wb473", 268 .data = &ntc_thermistor_id[1] }, 269 { .compatible = "ntc,ncp21wb473", 270 .data = &ntc_thermistor_id[2] }, 271 { .compatible = "ntc,ncp03wb473", 272 .data = &ntc_thermistor_id[3] }, 273 { .compatible = "ntc,ncp15wl333", 274 .data = &ntc_thermistor_id[4] }, 275 { }, 276 }; 277 MODULE_DEVICE_TABLE(of, ntc_match); 278 279 static struct ntc_thermistor_platform_data * 280 ntc_thermistor_parse_dt(struct platform_device *pdev) 281 { 282 struct iio_channel *chan; 283 enum iio_chan_type type; 284 struct device_node *np = pdev->dev.of_node; 285 struct ntc_thermistor_platform_data *pdata; 286 int ret; 287 288 if (!np) 289 return NULL; 290 291 pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL); 292 if (!pdata) 293 return ERR_PTR(-ENOMEM); 294 295 chan = iio_channel_get(&pdev->dev, NULL); 296 if (IS_ERR(chan)) 297 return ERR_CAST(chan); 298 299 ret = iio_get_channel_type(chan, &type); 300 if (ret < 0) 301 return ERR_PTR(ret); 302 303 if (type != IIO_VOLTAGE) 304 return ERR_PTR(-EINVAL); 305 306 if (of_property_read_u32(np, "pullup-uv", &pdata->pullup_uv)) 307 return ERR_PTR(-ENODEV); 308 if (of_property_read_u32(np, "pullup-ohm", &pdata->pullup_ohm)) 309 return ERR_PTR(-ENODEV); 310 if (of_property_read_u32(np, "pulldown-ohm", &pdata->pulldown_ohm)) 311 return ERR_PTR(-ENODEV); 312 313 if (of_find_property(np, "connected-positive", NULL)) 314 pdata->connect = NTC_CONNECTED_POSITIVE; 315 else /* status change should be possible if not always on. */ 316 pdata->connect = NTC_CONNECTED_GROUND; 317 318 pdata->chan = chan; 319 pdata->read_uv = ntc_adc_iio_read; 320 321 return pdata; 322 } 323 static void ntc_iio_channel_release(struct ntc_thermistor_platform_data *pdata) 324 { 325 if (pdata->chan) 326 iio_channel_release(pdata->chan); 327 } 328 #else 329 static struct ntc_thermistor_platform_data * 330 ntc_thermistor_parse_dt(struct platform_device *pdev) 331 { 332 return NULL; 333 } 334 335 #define ntc_match NULL 336 337 static void ntc_iio_channel_release(struct ntc_thermistor_platform_data *pdata) 338 { } 339 #endif 340 341 static inline u64 div64_u64_safe(u64 dividend, u64 divisor) 342 { 343 if (divisor == 0 && dividend == 0) 344 return 0; 345 if (divisor == 0) 346 return UINT_MAX; 347 return div64_u64(dividend, divisor); 348 } 349 350 static int get_ohm_of_thermistor(struct ntc_data *data, unsigned int uv) 351 { 352 struct ntc_thermistor_platform_data *pdata = data->pdata; 353 u32 puv = pdata->pullup_uv; 354 u64 n, puo, pdo; 355 puo = pdata->pullup_ohm; 356 pdo = pdata->pulldown_ohm; 357 358 if (uv == 0) 359 return (pdata->connect == NTC_CONNECTED_POSITIVE) ? 360 INT_MAX : 0; 361 if (uv >= puv) 362 return (pdata->connect == NTC_CONNECTED_POSITIVE) ? 363 0 : INT_MAX; 364 365 if (pdata->connect == NTC_CONNECTED_POSITIVE && puo == 0) 366 n = div_u64(pdo * (puv - uv), uv); 367 else if (pdata->connect == NTC_CONNECTED_GROUND && pdo == 0) 368 n = div_u64(puo * uv, puv - uv); 369 else if (pdata->connect == NTC_CONNECTED_POSITIVE) 370 n = div64_u64_safe(pdo * puo * (puv - uv), 371 puo * uv - pdo * (puv - uv)); 372 else 373 n = div64_u64_safe(pdo * puo * uv, pdo * (puv - uv) - puo * uv); 374 375 if (n > INT_MAX) 376 n = INT_MAX; 377 return n; 378 } 379 380 static void lookup_comp(struct ntc_data *data, unsigned int ohm, 381 int *i_low, int *i_high) 382 { 383 int start, end, mid; 384 385 /* 386 * Handle special cases: Resistance is higher than or equal to 387 * resistance in first table entry, or resistance is lower or equal 388 * to resistance in last table entry. 389 * In these cases, return i_low == i_high, either pointing to the 390 * beginning or to the end of the table depending on the condition. 391 */ 392 if (ohm >= data->comp[0].ohm) { 393 *i_low = 0; 394 *i_high = 0; 395 return; 396 } 397 if (ohm <= data->comp[data->n_comp - 1].ohm) { 398 *i_low = data->n_comp - 1; 399 *i_high = data->n_comp - 1; 400 return; 401 } 402 403 /* Do a binary search on compensation table */ 404 start = 0; 405 end = data->n_comp; 406 while (start < end) { 407 mid = start + (end - start) / 2; 408 /* 409 * start <= mid < end 410 * data->comp[start].ohm > ohm >= data->comp[end].ohm 411 * 412 * We could check for "ohm == data->comp[mid].ohm" here, but 413 * that is a quite unlikely condition, and we would have to 414 * check again after updating start. Check it at the end instead 415 * for simplicity. 416 */ 417 if (ohm >= data->comp[mid].ohm) { 418 end = mid; 419 } else { 420 start = mid + 1; 421 /* 422 * ohm >= data->comp[start].ohm might be true here, 423 * since we set start to mid + 1. In that case, we are 424 * done. We could keep going, but the condition is quite 425 * likely to occur, so it is worth checking for it. 426 */ 427 if (ohm >= data->comp[start].ohm) 428 end = start; 429 } 430 /* 431 * start <= end 432 * data->comp[start].ohm >= ohm >= data->comp[end].ohm 433 */ 434 } 435 /* 436 * start == end 437 * ohm >= data->comp[end].ohm 438 */ 439 *i_low = end; 440 if (ohm == data->comp[end].ohm) 441 *i_high = end; 442 else 443 *i_high = end - 1; 444 } 445 446 static int get_temp_mc(struct ntc_data *data, unsigned int ohm) 447 { 448 int low, high; 449 int temp; 450 451 lookup_comp(data, ohm, &low, &high); 452 if (low == high) { 453 /* Unable to use linear approximation */ 454 temp = data->comp[low].temp_c * 1000; 455 } else { 456 temp = data->comp[low].temp_c * 1000 + 457 ((data->comp[high].temp_c - data->comp[low].temp_c) * 458 1000 * ((int)ohm - (int)data->comp[low].ohm)) / 459 ((int)data->comp[high].ohm - (int)data->comp[low].ohm); 460 } 461 return temp; 462 } 463 464 static int ntc_thermistor_get_ohm(struct ntc_data *data) 465 { 466 int read_uv; 467 468 if (data->pdata->read_ohm) 469 return data->pdata->read_ohm(); 470 471 if (data->pdata->read_uv) { 472 read_uv = data->pdata->read_uv(data->pdata); 473 if (read_uv < 0) 474 return read_uv; 475 return get_ohm_of_thermistor(data, read_uv); 476 } 477 return -EINVAL; 478 } 479 480 static int ntc_read_temp(void *dev, int *temp) 481 { 482 struct ntc_data *data = dev_get_drvdata(dev); 483 int ohm; 484 485 ohm = ntc_thermistor_get_ohm(data); 486 if (ohm < 0) 487 return ohm; 488 489 *temp = get_temp_mc(data, ohm); 490 491 return 0; 492 } 493 494 static ssize_t ntc_show_name(struct device *dev, 495 struct device_attribute *attr, char *buf) 496 { 497 struct ntc_data *data = dev_get_drvdata(dev); 498 499 return sprintf(buf, "%s\n", data->name); 500 } 501 502 static ssize_t ntc_show_type(struct device *dev, 503 struct device_attribute *attr, char *buf) 504 { 505 return sprintf(buf, "4\n"); 506 } 507 508 static ssize_t ntc_show_temp(struct device *dev, 509 struct device_attribute *attr, char *buf) 510 { 511 struct ntc_data *data = dev_get_drvdata(dev); 512 int ohm; 513 514 ohm = ntc_thermistor_get_ohm(data); 515 if (ohm < 0) 516 return ohm; 517 518 return sprintf(buf, "%d\n", get_temp_mc(data, ohm)); 519 } 520 521 static SENSOR_DEVICE_ATTR(temp1_type, S_IRUGO, ntc_show_type, NULL, 0); 522 static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, ntc_show_temp, NULL, 0); 523 static DEVICE_ATTR(name, S_IRUGO, ntc_show_name, NULL); 524 525 static struct attribute *ntc_attributes[] = { 526 &dev_attr_name.attr, 527 &sensor_dev_attr_temp1_type.dev_attr.attr, 528 &sensor_dev_attr_temp1_input.dev_attr.attr, 529 NULL, 530 }; 531 532 static const struct attribute_group ntc_attr_group = { 533 .attrs = ntc_attributes, 534 }; 535 536 static const struct thermal_zone_of_device_ops ntc_of_thermal_ops = { 537 .get_temp = ntc_read_temp, 538 }; 539 540 static int ntc_thermistor_probe(struct platform_device *pdev) 541 { 542 const struct of_device_id *of_id = 543 of_match_device(of_match_ptr(ntc_match), &pdev->dev); 544 const struct platform_device_id *pdev_id; 545 struct ntc_thermistor_platform_data *pdata; 546 struct ntc_data *data; 547 int ret; 548 549 pdata = ntc_thermistor_parse_dt(pdev); 550 if (IS_ERR(pdata)) 551 return PTR_ERR(pdata); 552 else if (pdata == NULL) 553 pdata = dev_get_platdata(&pdev->dev); 554 555 if (!pdata) { 556 dev_err(&pdev->dev, "No platform init data supplied.\n"); 557 return -ENODEV; 558 } 559 560 /* Either one of the two is required. */ 561 if (!pdata->read_uv && !pdata->read_ohm) { 562 dev_err(&pdev->dev, 563 "Both read_uv and read_ohm missing. Need either one of the two.\n"); 564 return -EINVAL; 565 } 566 567 if (pdata->read_uv && pdata->read_ohm) { 568 dev_warn(&pdev->dev, 569 "Only one of read_uv and read_ohm is needed; ignoring read_uv.\n"); 570 pdata->read_uv = NULL; 571 } 572 573 if (pdata->read_uv && (pdata->pullup_uv == 0 || 574 (pdata->pullup_ohm == 0 && pdata->connect == 575 NTC_CONNECTED_GROUND) || 576 (pdata->pulldown_ohm == 0 && pdata->connect == 577 NTC_CONNECTED_POSITIVE) || 578 (pdata->connect != NTC_CONNECTED_POSITIVE && 579 pdata->connect != NTC_CONNECTED_GROUND))) { 580 dev_err(&pdev->dev, 581 "Required data to use read_uv not supplied.\n"); 582 return -EINVAL; 583 } 584 585 data = devm_kzalloc(&pdev->dev, sizeof(struct ntc_data), GFP_KERNEL); 586 if (!data) 587 return -ENOMEM; 588 589 pdev_id = of_id ? of_id->data : platform_get_device_id(pdev); 590 591 data->dev = &pdev->dev; 592 data->pdata = pdata; 593 strlcpy(data->name, pdev_id->name, sizeof(data->name)); 594 595 switch (pdev_id->driver_data) { 596 case TYPE_NCPXXWB473: 597 data->comp = ncpXXwb473; 598 data->n_comp = ARRAY_SIZE(ncpXXwb473); 599 break; 600 case TYPE_NCPXXWL333: 601 data->comp = ncpXXwl333; 602 data->n_comp = ARRAY_SIZE(ncpXXwl333); 603 break; 604 case TYPE_B57330V2103: 605 data->comp = b57330v2103; 606 data->n_comp = ARRAY_SIZE(b57330v2103); 607 break; 608 case TYPE_NCPXXWF104: 609 data->comp = ncpXXwf104; 610 data->n_comp = ARRAY_SIZE(ncpXXwf104); 611 break; 612 default: 613 dev_err(&pdev->dev, "Unknown device type: %lu(%s)\n", 614 pdev_id->driver_data, pdev_id->name); 615 return -EINVAL; 616 } 617 618 platform_set_drvdata(pdev, data); 619 620 ret = sysfs_create_group(&data->dev->kobj, &ntc_attr_group); 621 if (ret) { 622 dev_err(data->dev, "unable to create sysfs files\n"); 623 return ret; 624 } 625 626 data->hwmon_dev = hwmon_device_register(data->dev); 627 if (IS_ERR(data->hwmon_dev)) { 628 dev_err(data->dev, "unable to register as hwmon device.\n"); 629 ret = PTR_ERR(data->hwmon_dev); 630 goto err_after_sysfs; 631 } 632 633 dev_info(&pdev->dev, "Thermistor type: %s successfully probed.\n", 634 pdev_id->name); 635 636 data->tz = thermal_zone_of_sensor_register(data->dev, 0, data->dev, 637 &ntc_of_thermal_ops); 638 if (IS_ERR(data->tz)) { 639 dev_dbg(&pdev->dev, "Failed to register to thermal fw.\n"); 640 data->tz = NULL; 641 } 642 643 return 0; 644 err_after_sysfs: 645 sysfs_remove_group(&data->dev->kobj, &ntc_attr_group); 646 ntc_iio_channel_release(pdata); 647 return ret; 648 } 649 650 static int ntc_thermistor_remove(struct platform_device *pdev) 651 { 652 struct ntc_data *data = platform_get_drvdata(pdev); 653 struct ntc_thermistor_platform_data *pdata = data->pdata; 654 655 hwmon_device_unregister(data->hwmon_dev); 656 sysfs_remove_group(&data->dev->kobj, &ntc_attr_group); 657 ntc_iio_channel_release(pdata); 658 659 thermal_zone_of_sensor_unregister(data->dev, data->tz); 660 661 return 0; 662 } 663 664 static struct platform_driver ntc_thermistor_driver = { 665 .driver = { 666 .name = "ntc-thermistor", 667 .of_match_table = of_match_ptr(ntc_match), 668 }, 669 .probe = ntc_thermistor_probe, 670 .remove = ntc_thermistor_remove, 671 .id_table = ntc_thermistor_id, 672 }; 673 674 module_platform_driver(ntc_thermistor_driver); 675 676 MODULE_DESCRIPTION("NTC Thermistor Driver"); 677 MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>"); 678 MODULE_LICENSE("GPL"); 679 MODULE_ALIAS("platform:ntc-thermistor"); 680