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 { "ncp15xh103", TYPE_NCPXXXH103 }, 58 { }, 59 }; 60 61 /* 62 * A compensation table should be sorted by the values of .ohm 63 * in descending order. 64 * The following compensation tables are from the specification of Murata NTC 65 * Thermistors Datasheet 66 */ 67 static const struct ntc_compensation ncpXXwb473[] = { 68 { .temp_c = -40, .ohm = 1747920 }, 69 { .temp_c = -35, .ohm = 1245428 }, 70 { .temp_c = -30, .ohm = 898485 }, 71 { .temp_c = -25, .ohm = 655802 }, 72 { .temp_c = -20, .ohm = 483954 }, 73 { .temp_c = -15, .ohm = 360850 }, 74 { .temp_c = -10, .ohm = 271697 }, 75 { .temp_c = -5, .ohm = 206463 }, 76 { .temp_c = 0, .ohm = 158214 }, 77 { .temp_c = 5, .ohm = 122259 }, 78 { .temp_c = 10, .ohm = 95227 }, 79 { .temp_c = 15, .ohm = 74730 }, 80 { .temp_c = 20, .ohm = 59065 }, 81 { .temp_c = 25, .ohm = 47000 }, 82 { .temp_c = 30, .ohm = 37643 }, 83 { .temp_c = 35, .ohm = 30334 }, 84 { .temp_c = 40, .ohm = 24591 }, 85 { .temp_c = 45, .ohm = 20048 }, 86 { .temp_c = 50, .ohm = 16433 }, 87 { .temp_c = 55, .ohm = 13539 }, 88 { .temp_c = 60, .ohm = 11209 }, 89 { .temp_c = 65, .ohm = 9328 }, 90 { .temp_c = 70, .ohm = 7798 }, 91 { .temp_c = 75, .ohm = 6544 }, 92 { .temp_c = 80, .ohm = 5518 }, 93 { .temp_c = 85, .ohm = 4674 }, 94 { .temp_c = 90, .ohm = 3972 }, 95 { .temp_c = 95, .ohm = 3388 }, 96 { .temp_c = 100, .ohm = 2902 }, 97 { .temp_c = 105, .ohm = 2494 }, 98 { .temp_c = 110, .ohm = 2150 }, 99 { .temp_c = 115, .ohm = 1860 }, 100 { .temp_c = 120, .ohm = 1615 }, 101 { .temp_c = 125, .ohm = 1406 }, 102 }; 103 static const struct ntc_compensation ncpXXwl333[] = { 104 { .temp_c = -40, .ohm = 1610154 }, 105 { .temp_c = -35, .ohm = 1130850 }, 106 { .temp_c = -30, .ohm = 802609 }, 107 { .temp_c = -25, .ohm = 575385 }, 108 { .temp_c = -20, .ohm = 416464 }, 109 { .temp_c = -15, .ohm = 304219 }, 110 { .temp_c = -10, .ohm = 224193 }, 111 { .temp_c = -5, .ohm = 166623 }, 112 { .temp_c = 0, .ohm = 124850 }, 113 { .temp_c = 5, .ohm = 94287 }, 114 { .temp_c = 10, .ohm = 71747 }, 115 { .temp_c = 15, .ohm = 54996 }, 116 { .temp_c = 20, .ohm = 42455 }, 117 { .temp_c = 25, .ohm = 33000 }, 118 { .temp_c = 30, .ohm = 25822 }, 119 { .temp_c = 35, .ohm = 20335 }, 120 { .temp_c = 40, .ohm = 16115 }, 121 { .temp_c = 45, .ohm = 12849 }, 122 { .temp_c = 50, .ohm = 10306 }, 123 { .temp_c = 55, .ohm = 8314 }, 124 { .temp_c = 60, .ohm = 6746 }, 125 { .temp_c = 65, .ohm = 5503 }, 126 { .temp_c = 70, .ohm = 4513 }, 127 { .temp_c = 75, .ohm = 3721 }, 128 { .temp_c = 80, .ohm = 3084 }, 129 { .temp_c = 85, .ohm = 2569 }, 130 { .temp_c = 90, .ohm = 2151 }, 131 { .temp_c = 95, .ohm = 1809 }, 132 { .temp_c = 100, .ohm = 1529 }, 133 { .temp_c = 105, .ohm = 1299 }, 134 { .temp_c = 110, .ohm = 1108 }, 135 { .temp_c = 115, .ohm = 949 }, 136 { .temp_c = 120, .ohm = 817 }, 137 { .temp_c = 125, .ohm = 707 }, 138 }; 139 140 static const struct ntc_compensation ncpXXwf104[] = { 141 { .temp_c = -40, .ohm = 4397119 }, 142 { .temp_c = -35, .ohm = 3088599 }, 143 { .temp_c = -30, .ohm = 2197225 }, 144 { .temp_c = -25, .ohm = 1581881 }, 145 { .temp_c = -20, .ohm = 1151037 }, 146 { .temp_c = -15, .ohm = 846579 }, 147 { .temp_c = -10, .ohm = 628988 }, 148 { .temp_c = -5, .ohm = 471632 }, 149 { .temp_c = 0, .ohm = 357012 }, 150 { .temp_c = 5, .ohm = 272500 }, 151 { .temp_c = 10, .ohm = 209710 }, 152 { .temp_c = 15, .ohm = 162651 }, 153 { .temp_c = 20, .ohm = 127080 }, 154 { .temp_c = 25, .ohm = 100000 }, 155 { .temp_c = 30, .ohm = 79222 }, 156 { .temp_c = 35, .ohm = 63167 }, 157 { .temp_c = 40, .ohm = 50677 }, 158 { .temp_c = 45, .ohm = 40904 }, 159 { .temp_c = 50, .ohm = 33195 }, 160 { .temp_c = 55, .ohm = 27091 }, 161 { .temp_c = 60, .ohm = 22224 }, 162 { .temp_c = 65, .ohm = 18323 }, 163 { .temp_c = 70, .ohm = 15184 }, 164 { .temp_c = 75, .ohm = 12635 }, 165 { .temp_c = 80, .ohm = 10566 }, 166 { .temp_c = 85, .ohm = 8873 }, 167 { .temp_c = 90, .ohm = 7481 }, 168 { .temp_c = 95, .ohm = 6337 }, 169 { .temp_c = 100, .ohm = 5384 }, 170 { .temp_c = 105, .ohm = 4594 }, 171 { .temp_c = 110, .ohm = 3934 }, 172 { .temp_c = 115, .ohm = 3380 }, 173 { .temp_c = 120, .ohm = 2916 }, 174 { .temp_c = 125, .ohm = 2522 }, 175 }; 176 177 static const struct ntc_compensation ncpXXxh103[] = { 178 { .temp_c = -40, .ohm = 247565 }, 179 { .temp_c = -35, .ohm = 181742 }, 180 { .temp_c = -30, .ohm = 135128 }, 181 { .temp_c = -25, .ohm = 101678 }, 182 { .temp_c = -20, .ohm = 77373 }, 183 { .temp_c = -15, .ohm = 59504 }, 184 { .temp_c = -10, .ohm = 46222 }, 185 { .temp_c = -5, .ohm = 36244 }, 186 { .temp_c = 0, .ohm = 28674 }, 187 { .temp_c = 5, .ohm = 22878 }, 188 { .temp_c = 10, .ohm = 18399 }, 189 { .temp_c = 15, .ohm = 14910 }, 190 { .temp_c = 20, .ohm = 12169 }, 191 { .temp_c = 25, .ohm = 10000 }, 192 { .temp_c = 30, .ohm = 8271 }, 193 { .temp_c = 35, .ohm = 6883 }, 194 { .temp_c = 40, .ohm = 5762 }, 195 { .temp_c = 45, .ohm = 4851 }, 196 { .temp_c = 50, .ohm = 4105 }, 197 { .temp_c = 55, .ohm = 3492 }, 198 { .temp_c = 60, .ohm = 2985 }, 199 { .temp_c = 65, .ohm = 2563 }, 200 { .temp_c = 70, .ohm = 2211 }, 201 { .temp_c = 75, .ohm = 1915 }, 202 { .temp_c = 80, .ohm = 1666 }, 203 { .temp_c = 85, .ohm = 1454 }, 204 { .temp_c = 90, .ohm = 1275 }, 205 { .temp_c = 95, .ohm = 1121 }, 206 { .temp_c = 100, .ohm = 990 }, 207 { .temp_c = 105, .ohm = 876 }, 208 { .temp_c = 110, .ohm = 779 }, 209 { .temp_c = 115, .ohm = 694 }, 210 { .temp_c = 120, .ohm = 620 }, 211 { .temp_c = 125, .ohm = 556 }, 212 }; 213 214 /* 215 * The following compensation table is from the specification of EPCOS NTC 216 * Thermistors Datasheet 217 */ 218 static const struct ntc_compensation b57330v2103[] = { 219 { .temp_c = -40, .ohm = 190030 }, 220 { .temp_c = -35, .ohm = 145360 }, 221 { .temp_c = -30, .ohm = 112060 }, 222 { .temp_c = -25, .ohm = 87041 }, 223 { .temp_c = -20, .ohm = 68104 }, 224 { .temp_c = -15, .ohm = 53665 }, 225 { .temp_c = -10, .ohm = 42576 }, 226 { .temp_c = -5, .ohm = 34001 }, 227 { .temp_c = 0, .ohm = 27326 }, 228 { .temp_c = 5, .ohm = 22096 }, 229 { .temp_c = 10, .ohm = 17973 }, 230 { .temp_c = 15, .ohm = 14703 }, 231 { .temp_c = 20, .ohm = 12090 }, 232 { .temp_c = 25, .ohm = 10000 }, 233 { .temp_c = 30, .ohm = 8311 }, 234 { .temp_c = 35, .ohm = 6941 }, 235 { .temp_c = 40, .ohm = 5825 }, 236 { .temp_c = 45, .ohm = 4911 }, 237 { .temp_c = 50, .ohm = 4158 }, 238 { .temp_c = 55, .ohm = 3536 }, 239 { .temp_c = 60, .ohm = 3019 }, 240 { .temp_c = 65, .ohm = 2588 }, 241 { .temp_c = 70, .ohm = 2227 }, 242 { .temp_c = 75, .ohm = 1924 }, 243 { .temp_c = 80, .ohm = 1668 }, 244 { .temp_c = 85, .ohm = 1451 }, 245 { .temp_c = 90, .ohm = 1266 }, 246 { .temp_c = 95, .ohm = 1108 }, 247 { .temp_c = 100, .ohm = 973 }, 248 { .temp_c = 105, .ohm = 857 }, 249 { .temp_c = 110, .ohm = 757 }, 250 { .temp_c = 115, .ohm = 671 }, 251 { .temp_c = 120, .ohm = 596 }, 252 { .temp_c = 125, .ohm = 531 }, 253 }; 254 255 struct ntc_data { 256 struct ntc_thermistor_platform_data *pdata; 257 const struct ntc_compensation *comp; 258 int n_comp; 259 }; 260 261 #if defined(CONFIG_OF) && IS_ENABLED(CONFIG_IIO) 262 static int ntc_adc_iio_read(struct ntc_thermistor_platform_data *pdata) 263 { 264 struct iio_channel *channel = pdata->chan; 265 int raw, uv, ret; 266 267 ret = iio_read_channel_raw(channel, &raw); 268 if (ret < 0) { 269 pr_err("read channel() error: %d\n", ret); 270 return ret; 271 } 272 273 ret = iio_convert_raw_to_processed(channel, raw, &uv, 1000); 274 if (ret < 0) { 275 /* Assume 12 bit ADC with vref at pullup_uv */ 276 uv = (pdata->pullup_uv * (s64)raw) >> 12; 277 } 278 279 return uv; 280 } 281 282 static const struct of_device_id ntc_match[] = { 283 { .compatible = "murata,ncp15wb473", 284 .data = &ntc_thermistor_id[0] }, 285 { .compatible = "murata,ncp18wb473", 286 .data = &ntc_thermistor_id[1] }, 287 { .compatible = "murata,ncp21wb473", 288 .data = &ntc_thermistor_id[2] }, 289 { .compatible = "murata,ncp03wb473", 290 .data = &ntc_thermistor_id[3] }, 291 { .compatible = "murata,ncp15wl333", 292 .data = &ntc_thermistor_id[4] }, 293 { .compatible = "epcos,b57330v2103", 294 .data = &ntc_thermistor_id[5]}, 295 { .compatible = "murata,ncp03wf104", 296 .data = &ntc_thermistor_id[6] }, 297 { .compatible = "murata,ncp15xh103", 298 .data = &ntc_thermistor_id[7] }, 299 300 /* Usage of vendor name "ntc" is deprecated */ 301 { .compatible = "ntc,ncp15wb473", 302 .data = &ntc_thermistor_id[0] }, 303 { .compatible = "ntc,ncp18wb473", 304 .data = &ntc_thermistor_id[1] }, 305 { .compatible = "ntc,ncp21wb473", 306 .data = &ntc_thermistor_id[2] }, 307 { .compatible = "ntc,ncp03wb473", 308 .data = &ntc_thermistor_id[3] }, 309 { .compatible = "ntc,ncp15wl333", 310 .data = &ntc_thermistor_id[4] }, 311 { }, 312 }; 313 MODULE_DEVICE_TABLE(of, ntc_match); 314 315 static struct ntc_thermistor_platform_data * 316 ntc_thermistor_parse_dt(struct device *dev) 317 { 318 struct iio_channel *chan; 319 enum iio_chan_type type; 320 struct device_node *np = dev->of_node; 321 struct ntc_thermistor_platform_data *pdata; 322 int ret; 323 324 if (!np) 325 return NULL; 326 327 pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL); 328 if (!pdata) 329 return ERR_PTR(-ENOMEM); 330 331 chan = devm_iio_channel_get(dev, NULL); 332 if (IS_ERR(chan)) 333 return ERR_CAST(chan); 334 335 ret = iio_get_channel_type(chan, &type); 336 if (ret < 0) 337 return ERR_PTR(ret); 338 339 if (type != IIO_VOLTAGE) 340 return ERR_PTR(-EINVAL); 341 342 if (of_property_read_u32(np, "pullup-uv", &pdata->pullup_uv)) 343 return ERR_PTR(-ENODEV); 344 if (of_property_read_u32(np, "pullup-ohm", &pdata->pullup_ohm)) 345 return ERR_PTR(-ENODEV); 346 if (of_property_read_u32(np, "pulldown-ohm", &pdata->pulldown_ohm)) 347 return ERR_PTR(-ENODEV); 348 349 if (of_find_property(np, "connected-positive", NULL)) 350 pdata->connect = NTC_CONNECTED_POSITIVE; 351 else /* status change should be possible if not always on. */ 352 pdata->connect = NTC_CONNECTED_GROUND; 353 354 pdata->chan = chan; 355 pdata->read_uv = ntc_adc_iio_read; 356 357 return pdata; 358 } 359 #else 360 static struct ntc_thermistor_platform_data * 361 ntc_thermistor_parse_dt(struct device *dev) 362 { 363 return NULL; 364 } 365 366 #define ntc_match NULL 367 368 #endif 369 370 static inline u64 div64_u64_safe(u64 dividend, u64 divisor) 371 { 372 if (divisor == 0 && dividend == 0) 373 return 0; 374 if (divisor == 0) 375 return UINT_MAX; 376 return div64_u64(dividend, divisor); 377 } 378 379 static int get_ohm_of_thermistor(struct ntc_data *data, unsigned int uv) 380 { 381 struct ntc_thermistor_platform_data *pdata = data->pdata; 382 u32 puv = pdata->pullup_uv; 383 u64 n, puo, pdo; 384 puo = pdata->pullup_ohm; 385 pdo = pdata->pulldown_ohm; 386 387 if (uv == 0) 388 return (pdata->connect == NTC_CONNECTED_POSITIVE) ? 389 INT_MAX : 0; 390 if (uv >= puv) 391 return (pdata->connect == NTC_CONNECTED_POSITIVE) ? 392 0 : INT_MAX; 393 394 if (pdata->connect == NTC_CONNECTED_POSITIVE && puo == 0) 395 n = div_u64(pdo * (puv - uv), uv); 396 else if (pdata->connect == NTC_CONNECTED_GROUND && pdo == 0) 397 n = div_u64(puo * uv, puv - uv); 398 else if (pdata->connect == NTC_CONNECTED_POSITIVE) 399 n = div64_u64_safe(pdo * puo * (puv - uv), 400 puo * uv - pdo * (puv - uv)); 401 else 402 n = div64_u64_safe(pdo * puo * uv, pdo * (puv - uv) - puo * uv); 403 404 if (n > INT_MAX) 405 n = INT_MAX; 406 return n; 407 } 408 409 static void lookup_comp(struct ntc_data *data, unsigned int ohm, 410 int *i_low, int *i_high) 411 { 412 int start, end, mid; 413 414 /* 415 * Handle special cases: Resistance is higher than or equal to 416 * resistance in first table entry, or resistance is lower or equal 417 * to resistance in last table entry. 418 * In these cases, return i_low == i_high, either pointing to the 419 * beginning or to the end of the table depending on the condition. 420 */ 421 if (ohm >= data->comp[0].ohm) { 422 *i_low = 0; 423 *i_high = 0; 424 return; 425 } 426 if (ohm <= data->comp[data->n_comp - 1].ohm) { 427 *i_low = data->n_comp - 1; 428 *i_high = data->n_comp - 1; 429 return; 430 } 431 432 /* Do a binary search on compensation table */ 433 start = 0; 434 end = data->n_comp; 435 while (start < end) { 436 mid = start + (end - start) / 2; 437 /* 438 * start <= mid < end 439 * data->comp[start].ohm > ohm >= data->comp[end].ohm 440 * 441 * We could check for "ohm == data->comp[mid].ohm" here, but 442 * that is a quite unlikely condition, and we would have to 443 * check again after updating start. Check it at the end instead 444 * for simplicity. 445 */ 446 if (ohm >= data->comp[mid].ohm) { 447 end = mid; 448 } else { 449 start = mid + 1; 450 /* 451 * ohm >= data->comp[start].ohm might be true here, 452 * since we set start to mid + 1. In that case, we are 453 * done. We could keep going, but the condition is quite 454 * likely to occur, so it is worth checking for it. 455 */ 456 if (ohm >= data->comp[start].ohm) 457 end = start; 458 } 459 /* 460 * start <= end 461 * data->comp[start].ohm >= ohm >= data->comp[end].ohm 462 */ 463 } 464 /* 465 * start == end 466 * ohm >= data->comp[end].ohm 467 */ 468 *i_low = end; 469 if (ohm == data->comp[end].ohm) 470 *i_high = end; 471 else 472 *i_high = end - 1; 473 } 474 475 static int get_temp_mc(struct ntc_data *data, unsigned int ohm) 476 { 477 int low, high; 478 int temp; 479 480 lookup_comp(data, ohm, &low, &high); 481 if (low == high) { 482 /* Unable to use linear approximation */ 483 temp = data->comp[low].temp_c * 1000; 484 } else { 485 temp = data->comp[low].temp_c * 1000 + 486 ((data->comp[high].temp_c - data->comp[low].temp_c) * 487 1000 * ((int)ohm - (int)data->comp[low].ohm)) / 488 ((int)data->comp[high].ohm - (int)data->comp[low].ohm); 489 } 490 return temp; 491 } 492 493 static int ntc_thermistor_get_ohm(struct ntc_data *data) 494 { 495 int read_uv; 496 497 if (data->pdata->read_ohm) 498 return data->pdata->read_ohm(); 499 500 if (data->pdata->read_uv) { 501 read_uv = data->pdata->read_uv(data->pdata); 502 if (read_uv < 0) 503 return read_uv; 504 return get_ohm_of_thermistor(data, read_uv); 505 } 506 return -EINVAL; 507 } 508 509 static int ntc_read_temp(void *data, int *temp) 510 { 511 int ohm; 512 513 ohm = ntc_thermistor_get_ohm(data); 514 if (ohm < 0) 515 return ohm; 516 517 *temp = get_temp_mc(data, ohm); 518 519 return 0; 520 } 521 522 static ssize_t ntc_show_type(struct device *dev, 523 struct device_attribute *attr, char *buf) 524 { 525 return sprintf(buf, "4\n"); 526 } 527 528 static ssize_t ntc_show_temp(struct device *dev, 529 struct device_attribute *attr, char *buf) 530 { 531 struct ntc_data *data = dev_get_drvdata(dev); 532 int ohm; 533 534 ohm = ntc_thermistor_get_ohm(data); 535 if (ohm < 0) 536 return ohm; 537 538 return sprintf(buf, "%d\n", get_temp_mc(data, ohm)); 539 } 540 541 static SENSOR_DEVICE_ATTR(temp1_type, S_IRUGO, ntc_show_type, NULL, 0); 542 static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, ntc_show_temp, NULL, 0); 543 544 static struct attribute *ntc_attrs[] = { 545 &sensor_dev_attr_temp1_type.dev_attr.attr, 546 &sensor_dev_attr_temp1_input.dev_attr.attr, 547 NULL, 548 }; 549 ATTRIBUTE_GROUPS(ntc); 550 551 static const struct thermal_zone_of_device_ops ntc_of_thermal_ops = { 552 .get_temp = ntc_read_temp, 553 }; 554 555 static int ntc_thermistor_probe(struct platform_device *pdev) 556 { 557 struct thermal_zone_device *tz; 558 struct device *dev = &pdev->dev; 559 const struct of_device_id *of_id = 560 of_match_device(of_match_ptr(ntc_match), dev); 561 const struct platform_device_id *pdev_id; 562 struct ntc_thermistor_platform_data *pdata; 563 struct device *hwmon_dev; 564 struct ntc_data *data; 565 566 pdata = ntc_thermistor_parse_dt(dev); 567 if (IS_ERR(pdata)) 568 return PTR_ERR(pdata); 569 else if (pdata == NULL) 570 pdata = dev_get_platdata(dev); 571 572 if (!pdata) { 573 dev_err(dev, "No platform init data supplied.\n"); 574 return -ENODEV; 575 } 576 577 /* Either one of the two is required. */ 578 if (!pdata->read_uv && !pdata->read_ohm) { 579 dev_err(dev, 580 "Both read_uv and read_ohm missing. Need either one of the two.\n"); 581 return -EINVAL; 582 } 583 584 if (pdata->read_uv && pdata->read_ohm) { 585 dev_warn(dev, 586 "Only one of read_uv and read_ohm is needed; ignoring read_uv.\n"); 587 pdata->read_uv = NULL; 588 } 589 590 if (pdata->read_uv && (pdata->pullup_uv == 0 || 591 (pdata->pullup_ohm == 0 && pdata->connect == 592 NTC_CONNECTED_GROUND) || 593 (pdata->pulldown_ohm == 0 && pdata->connect == 594 NTC_CONNECTED_POSITIVE) || 595 (pdata->connect != NTC_CONNECTED_POSITIVE && 596 pdata->connect != NTC_CONNECTED_GROUND))) { 597 dev_err(dev, "Required data to use read_uv not supplied.\n"); 598 return -EINVAL; 599 } 600 601 data = devm_kzalloc(dev, sizeof(struct ntc_data), GFP_KERNEL); 602 if (!data) 603 return -ENOMEM; 604 605 pdev_id = of_id ? of_id->data : platform_get_device_id(pdev); 606 607 data->pdata = pdata; 608 609 switch (pdev_id->driver_data) { 610 case TYPE_NCPXXWB473: 611 data->comp = ncpXXwb473; 612 data->n_comp = ARRAY_SIZE(ncpXXwb473); 613 break; 614 case TYPE_NCPXXWL333: 615 data->comp = ncpXXwl333; 616 data->n_comp = ARRAY_SIZE(ncpXXwl333); 617 break; 618 case TYPE_B57330V2103: 619 data->comp = b57330v2103; 620 data->n_comp = ARRAY_SIZE(b57330v2103); 621 break; 622 case TYPE_NCPXXWF104: 623 data->comp = ncpXXwf104; 624 data->n_comp = ARRAY_SIZE(ncpXXwf104); 625 break; 626 case TYPE_NCPXXXH103: 627 data->comp = ncpXXxh103; 628 data->n_comp = ARRAY_SIZE(ncpXXxh103); 629 break; 630 default: 631 dev_err(dev, "Unknown device type: %lu(%s)\n", 632 pdev_id->driver_data, pdev_id->name); 633 return -EINVAL; 634 } 635 636 hwmon_dev = devm_hwmon_device_register_with_groups(dev, pdev_id->name, 637 data, ntc_groups); 638 if (IS_ERR(hwmon_dev)) { 639 dev_err(dev, "unable to register as hwmon device.\n"); 640 return PTR_ERR(hwmon_dev); 641 } 642 643 dev_info(dev, "Thermistor type: %s successfully probed.\n", 644 pdev_id->name); 645 646 tz = devm_thermal_zone_of_sensor_register(dev, 0, data, 647 &ntc_of_thermal_ops); 648 if (IS_ERR(tz)) 649 dev_dbg(dev, "Failed to register to thermal fw.\n"); 650 651 return 0; 652 } 653 654 static struct platform_driver ntc_thermistor_driver = { 655 .driver = { 656 .name = "ntc-thermistor", 657 .of_match_table = of_match_ptr(ntc_match), 658 }, 659 .probe = ntc_thermistor_probe, 660 .id_table = ntc_thermistor_id, 661 }; 662 663 module_platform_driver(ntc_thermistor_driver); 664 665 MODULE_DESCRIPTION("NTC Thermistor Driver"); 666 MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>"); 667 MODULE_LICENSE("GPL"); 668 MODULE_ALIAS("platform:ntc-thermistor"); 669