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 device *hwmon_dev; 257 struct ntc_thermistor_platform_data *pdata; 258 const struct ntc_compensation *comp; 259 struct device *dev; 260 int n_comp; 261 char name[PLATFORM_NAME_SIZE]; 262 struct thermal_zone_device *tz; 263 }; 264 265 #if defined(CONFIG_OF) && IS_ENABLED(CONFIG_IIO) 266 static int ntc_adc_iio_read(struct ntc_thermistor_platform_data *pdata) 267 { 268 struct iio_channel *channel = pdata->chan; 269 int raw, uv, ret; 270 271 ret = iio_read_channel_raw(channel, &raw); 272 if (ret < 0) { 273 pr_err("read channel() error: %d\n", ret); 274 return ret; 275 } 276 277 ret = iio_convert_raw_to_processed(channel, raw, &uv, 1000); 278 if (ret < 0) { 279 /* Assume 12 bit ADC with vref at pullup_uv */ 280 uv = (pdata->pullup_uv * (s64)raw) >> 12; 281 } 282 283 return uv; 284 } 285 286 static const struct of_device_id ntc_match[] = { 287 { .compatible = "murata,ncp15wb473", 288 .data = &ntc_thermistor_id[0] }, 289 { .compatible = "murata,ncp18wb473", 290 .data = &ntc_thermistor_id[1] }, 291 { .compatible = "murata,ncp21wb473", 292 .data = &ntc_thermistor_id[2] }, 293 { .compatible = "murata,ncp03wb473", 294 .data = &ntc_thermistor_id[3] }, 295 { .compatible = "murata,ncp15wl333", 296 .data = &ntc_thermistor_id[4] }, 297 { .compatible = "epcos,b57330v2103", 298 .data = &ntc_thermistor_id[5]}, 299 { .compatible = "murata,ncp03wf104", 300 .data = &ntc_thermistor_id[6] }, 301 { .compatible = "murata,ncp15xh103", 302 .data = &ntc_thermistor_id[7] }, 303 304 /* Usage of vendor name "ntc" is deprecated */ 305 { .compatible = "ntc,ncp15wb473", 306 .data = &ntc_thermistor_id[0] }, 307 { .compatible = "ntc,ncp18wb473", 308 .data = &ntc_thermistor_id[1] }, 309 { .compatible = "ntc,ncp21wb473", 310 .data = &ntc_thermistor_id[2] }, 311 { .compatible = "ntc,ncp03wb473", 312 .data = &ntc_thermistor_id[3] }, 313 { .compatible = "ntc,ncp15wl333", 314 .data = &ntc_thermistor_id[4] }, 315 { }, 316 }; 317 MODULE_DEVICE_TABLE(of, ntc_match); 318 319 static struct ntc_thermistor_platform_data * 320 ntc_thermistor_parse_dt(struct platform_device *pdev) 321 { 322 struct iio_channel *chan; 323 enum iio_chan_type type; 324 struct device_node *np = pdev->dev.of_node; 325 struct ntc_thermistor_platform_data *pdata; 326 int ret; 327 328 if (!np) 329 return NULL; 330 331 pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL); 332 if (!pdata) 333 return ERR_PTR(-ENOMEM); 334 335 chan = iio_channel_get(&pdev->dev, NULL); 336 if (IS_ERR(chan)) 337 return ERR_CAST(chan); 338 339 ret = iio_get_channel_type(chan, &type); 340 if (ret < 0) 341 return ERR_PTR(ret); 342 343 if (type != IIO_VOLTAGE) 344 return ERR_PTR(-EINVAL); 345 346 if (of_property_read_u32(np, "pullup-uv", &pdata->pullup_uv)) 347 return ERR_PTR(-ENODEV); 348 if (of_property_read_u32(np, "pullup-ohm", &pdata->pullup_ohm)) 349 return ERR_PTR(-ENODEV); 350 if (of_property_read_u32(np, "pulldown-ohm", &pdata->pulldown_ohm)) 351 return ERR_PTR(-ENODEV); 352 353 if (of_find_property(np, "connected-positive", NULL)) 354 pdata->connect = NTC_CONNECTED_POSITIVE; 355 else /* status change should be possible if not always on. */ 356 pdata->connect = NTC_CONNECTED_GROUND; 357 358 pdata->chan = chan; 359 pdata->read_uv = ntc_adc_iio_read; 360 361 return pdata; 362 } 363 static void ntc_iio_channel_release(struct ntc_thermistor_platform_data *pdata) 364 { 365 if (pdata->chan) 366 iio_channel_release(pdata->chan); 367 } 368 #else 369 static struct ntc_thermistor_platform_data * 370 ntc_thermistor_parse_dt(struct platform_device *pdev) 371 { 372 return NULL; 373 } 374 375 #define ntc_match NULL 376 377 static void ntc_iio_channel_release(struct ntc_thermistor_platform_data *pdata) 378 { } 379 #endif 380 381 static inline u64 div64_u64_safe(u64 dividend, u64 divisor) 382 { 383 if (divisor == 0 && dividend == 0) 384 return 0; 385 if (divisor == 0) 386 return UINT_MAX; 387 return div64_u64(dividend, divisor); 388 } 389 390 static int get_ohm_of_thermistor(struct ntc_data *data, unsigned int uv) 391 { 392 struct ntc_thermistor_platform_data *pdata = data->pdata; 393 u32 puv = pdata->pullup_uv; 394 u64 n, puo, pdo; 395 puo = pdata->pullup_ohm; 396 pdo = pdata->pulldown_ohm; 397 398 if (uv == 0) 399 return (pdata->connect == NTC_CONNECTED_POSITIVE) ? 400 INT_MAX : 0; 401 if (uv >= puv) 402 return (pdata->connect == NTC_CONNECTED_POSITIVE) ? 403 0 : INT_MAX; 404 405 if (pdata->connect == NTC_CONNECTED_POSITIVE && puo == 0) 406 n = div_u64(pdo * (puv - uv), uv); 407 else if (pdata->connect == NTC_CONNECTED_GROUND && pdo == 0) 408 n = div_u64(puo * uv, puv - uv); 409 else if (pdata->connect == NTC_CONNECTED_POSITIVE) 410 n = div64_u64_safe(pdo * puo * (puv - uv), 411 puo * uv - pdo * (puv - uv)); 412 else 413 n = div64_u64_safe(pdo * puo * uv, pdo * (puv - uv) - puo * uv); 414 415 if (n > INT_MAX) 416 n = INT_MAX; 417 return n; 418 } 419 420 static void lookup_comp(struct ntc_data *data, unsigned int ohm, 421 int *i_low, int *i_high) 422 { 423 int start, end, mid; 424 425 /* 426 * Handle special cases: Resistance is higher than or equal to 427 * resistance in first table entry, or resistance is lower or equal 428 * to resistance in last table entry. 429 * In these cases, return i_low == i_high, either pointing to the 430 * beginning or to the end of the table depending on the condition. 431 */ 432 if (ohm >= data->comp[0].ohm) { 433 *i_low = 0; 434 *i_high = 0; 435 return; 436 } 437 if (ohm <= data->comp[data->n_comp - 1].ohm) { 438 *i_low = data->n_comp - 1; 439 *i_high = data->n_comp - 1; 440 return; 441 } 442 443 /* Do a binary search on compensation table */ 444 start = 0; 445 end = data->n_comp; 446 while (start < end) { 447 mid = start + (end - start) / 2; 448 /* 449 * start <= mid < end 450 * data->comp[start].ohm > ohm >= data->comp[end].ohm 451 * 452 * We could check for "ohm == data->comp[mid].ohm" here, but 453 * that is a quite unlikely condition, and we would have to 454 * check again after updating start. Check it at the end instead 455 * for simplicity. 456 */ 457 if (ohm >= data->comp[mid].ohm) { 458 end = mid; 459 } else { 460 start = mid + 1; 461 /* 462 * ohm >= data->comp[start].ohm might be true here, 463 * since we set start to mid + 1. In that case, we are 464 * done. We could keep going, but the condition is quite 465 * likely to occur, so it is worth checking for it. 466 */ 467 if (ohm >= data->comp[start].ohm) 468 end = start; 469 } 470 /* 471 * start <= end 472 * data->comp[start].ohm >= ohm >= data->comp[end].ohm 473 */ 474 } 475 /* 476 * start == end 477 * ohm >= data->comp[end].ohm 478 */ 479 *i_low = end; 480 if (ohm == data->comp[end].ohm) 481 *i_high = end; 482 else 483 *i_high = end - 1; 484 } 485 486 static int get_temp_mc(struct ntc_data *data, unsigned int ohm) 487 { 488 int low, high; 489 int temp; 490 491 lookup_comp(data, ohm, &low, &high); 492 if (low == high) { 493 /* Unable to use linear approximation */ 494 temp = data->comp[low].temp_c * 1000; 495 } else { 496 temp = data->comp[low].temp_c * 1000 + 497 ((data->comp[high].temp_c - data->comp[low].temp_c) * 498 1000 * ((int)ohm - (int)data->comp[low].ohm)) / 499 ((int)data->comp[high].ohm - (int)data->comp[low].ohm); 500 } 501 return temp; 502 } 503 504 static int ntc_thermistor_get_ohm(struct ntc_data *data) 505 { 506 int read_uv; 507 508 if (data->pdata->read_ohm) 509 return data->pdata->read_ohm(); 510 511 if (data->pdata->read_uv) { 512 read_uv = data->pdata->read_uv(data->pdata); 513 if (read_uv < 0) 514 return read_uv; 515 return get_ohm_of_thermistor(data, read_uv); 516 } 517 return -EINVAL; 518 } 519 520 static int ntc_read_temp(void *dev, int *temp) 521 { 522 struct ntc_data *data = dev_get_drvdata(dev); 523 int ohm; 524 525 ohm = ntc_thermistor_get_ohm(data); 526 if (ohm < 0) 527 return ohm; 528 529 *temp = get_temp_mc(data, ohm); 530 531 return 0; 532 } 533 534 static ssize_t ntc_show_name(struct device *dev, 535 struct device_attribute *attr, char *buf) 536 { 537 struct ntc_data *data = dev_get_drvdata(dev); 538 539 return sprintf(buf, "%s\n", data->name); 540 } 541 542 static ssize_t ntc_show_type(struct device *dev, 543 struct device_attribute *attr, char *buf) 544 { 545 return sprintf(buf, "4\n"); 546 } 547 548 static ssize_t ntc_show_temp(struct device *dev, 549 struct device_attribute *attr, char *buf) 550 { 551 struct ntc_data *data = dev_get_drvdata(dev); 552 int ohm; 553 554 ohm = ntc_thermistor_get_ohm(data); 555 if (ohm < 0) 556 return ohm; 557 558 return sprintf(buf, "%d\n", get_temp_mc(data, ohm)); 559 } 560 561 static SENSOR_DEVICE_ATTR(temp1_type, S_IRUGO, ntc_show_type, NULL, 0); 562 static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, ntc_show_temp, NULL, 0); 563 static DEVICE_ATTR(name, S_IRUGO, ntc_show_name, NULL); 564 565 static struct attribute *ntc_attributes[] = { 566 &dev_attr_name.attr, 567 &sensor_dev_attr_temp1_type.dev_attr.attr, 568 &sensor_dev_attr_temp1_input.dev_attr.attr, 569 NULL, 570 }; 571 572 static const struct attribute_group ntc_attr_group = { 573 .attrs = ntc_attributes, 574 }; 575 576 static const struct thermal_zone_of_device_ops ntc_of_thermal_ops = { 577 .get_temp = ntc_read_temp, 578 }; 579 580 static int ntc_thermistor_probe(struct platform_device *pdev) 581 { 582 const struct of_device_id *of_id = 583 of_match_device(of_match_ptr(ntc_match), &pdev->dev); 584 const struct platform_device_id *pdev_id; 585 struct ntc_thermistor_platform_data *pdata; 586 struct ntc_data *data; 587 int ret; 588 589 pdata = ntc_thermistor_parse_dt(pdev); 590 if (IS_ERR(pdata)) 591 return PTR_ERR(pdata); 592 else if (pdata == NULL) 593 pdata = dev_get_platdata(&pdev->dev); 594 595 if (!pdata) { 596 dev_err(&pdev->dev, "No platform init data supplied.\n"); 597 return -ENODEV; 598 } 599 600 /* Either one of the two is required. */ 601 if (!pdata->read_uv && !pdata->read_ohm) { 602 dev_err(&pdev->dev, 603 "Both read_uv and read_ohm missing. Need either one of the two.\n"); 604 return -EINVAL; 605 } 606 607 if (pdata->read_uv && pdata->read_ohm) { 608 dev_warn(&pdev->dev, 609 "Only one of read_uv and read_ohm is needed; ignoring read_uv.\n"); 610 pdata->read_uv = NULL; 611 } 612 613 if (pdata->read_uv && (pdata->pullup_uv == 0 || 614 (pdata->pullup_ohm == 0 && pdata->connect == 615 NTC_CONNECTED_GROUND) || 616 (pdata->pulldown_ohm == 0 && pdata->connect == 617 NTC_CONNECTED_POSITIVE) || 618 (pdata->connect != NTC_CONNECTED_POSITIVE && 619 pdata->connect != NTC_CONNECTED_GROUND))) { 620 dev_err(&pdev->dev, 621 "Required data to use read_uv not supplied.\n"); 622 return -EINVAL; 623 } 624 625 data = devm_kzalloc(&pdev->dev, sizeof(struct ntc_data), GFP_KERNEL); 626 if (!data) 627 return -ENOMEM; 628 629 pdev_id = of_id ? of_id->data : platform_get_device_id(pdev); 630 631 data->dev = &pdev->dev; 632 data->pdata = pdata; 633 strlcpy(data->name, pdev_id->name, sizeof(data->name)); 634 635 switch (pdev_id->driver_data) { 636 case TYPE_NCPXXWB473: 637 data->comp = ncpXXwb473; 638 data->n_comp = ARRAY_SIZE(ncpXXwb473); 639 break; 640 case TYPE_NCPXXWL333: 641 data->comp = ncpXXwl333; 642 data->n_comp = ARRAY_SIZE(ncpXXwl333); 643 break; 644 case TYPE_B57330V2103: 645 data->comp = b57330v2103; 646 data->n_comp = ARRAY_SIZE(b57330v2103); 647 break; 648 case TYPE_NCPXXWF104: 649 data->comp = ncpXXwf104; 650 data->n_comp = ARRAY_SIZE(ncpXXwf104); 651 break; 652 case TYPE_NCPXXXH103: 653 data->comp = ncpXXxh103; 654 data->n_comp = ARRAY_SIZE(ncpXXxh103); 655 break; 656 default: 657 dev_err(&pdev->dev, "Unknown device type: %lu(%s)\n", 658 pdev_id->driver_data, pdev_id->name); 659 return -EINVAL; 660 } 661 662 platform_set_drvdata(pdev, data); 663 664 ret = sysfs_create_group(&data->dev->kobj, &ntc_attr_group); 665 if (ret) { 666 dev_err(data->dev, "unable to create sysfs files\n"); 667 return ret; 668 } 669 670 data->hwmon_dev = hwmon_device_register(data->dev); 671 if (IS_ERR(data->hwmon_dev)) { 672 dev_err(data->dev, "unable to register as hwmon device.\n"); 673 ret = PTR_ERR(data->hwmon_dev); 674 goto err_after_sysfs; 675 } 676 677 dev_info(&pdev->dev, "Thermistor type: %s successfully probed.\n", 678 pdev_id->name); 679 680 data->tz = thermal_zone_of_sensor_register(data->dev, 0, data->dev, 681 &ntc_of_thermal_ops); 682 if (IS_ERR(data->tz)) { 683 dev_dbg(&pdev->dev, "Failed to register to thermal fw.\n"); 684 data->tz = NULL; 685 } 686 687 return 0; 688 err_after_sysfs: 689 sysfs_remove_group(&data->dev->kobj, &ntc_attr_group); 690 ntc_iio_channel_release(pdata); 691 return ret; 692 } 693 694 static int ntc_thermistor_remove(struct platform_device *pdev) 695 { 696 struct ntc_data *data = platform_get_drvdata(pdev); 697 struct ntc_thermistor_platform_data *pdata = data->pdata; 698 699 hwmon_device_unregister(data->hwmon_dev); 700 sysfs_remove_group(&data->dev->kobj, &ntc_attr_group); 701 ntc_iio_channel_release(pdata); 702 703 thermal_zone_of_sensor_unregister(data->dev, data->tz); 704 705 return 0; 706 } 707 708 static struct platform_driver ntc_thermistor_driver = { 709 .driver = { 710 .name = "ntc-thermistor", 711 .of_match_table = of_match_ptr(ntc_match), 712 }, 713 .probe = ntc_thermistor_probe, 714 .remove = ntc_thermistor_remove, 715 .id_table = ntc_thermistor_id, 716 }; 717 718 module_platform_driver(ntc_thermistor_driver); 719 720 MODULE_DESCRIPTION("NTC Thermistor Driver"); 721 MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>"); 722 MODULE_LICENSE("GPL"); 723 MODULE_ALIAS("platform:ntc-thermistor"); 724