710 lines · c
1// SPDX-License-Identifier: GPL-2.0-or-later2/*3 * ntc_thermistor.c - NTC Thermistors4 *5 * Copyright (C) 2010 Samsung Electronics6 * MyungJoo Ham <myungjoo.ham@samsung.com>7 */8 9#include <linux/slab.h>10#include <linux/module.h>11#include <linux/math64.h>12#include <linux/mod_devicetable.h>13#include <linux/platform_device.h>14#include <linux/property.h>15#include <linux/err.h>16#include <linux/fixp-arith.h>17#include <linux/iio/consumer.h>18#include <linux/hwmon.h>19 20enum ntc_thermistor_type {21 TYPE_B57330V2103,22 TYPE_B57891S0103,23 TYPE_NCPXXWB473,24 TYPE_NCPXXWF104,25 TYPE_NCPXXWL333,26 TYPE_NCPXXXH103,27};28 29struct ntc_compensation {30 int temp_c;31 unsigned int ohm;32};33 34/*35 * Used as index in a zero-terminated array, holes not allowed so36 * that NTC_LAST is the first empty array entry.37 */38enum {39 NTC_B57330V2103,40 NTC_B57891S0103,41 NTC_NCP03WB473,42 NTC_NCP03WF104,43 NTC_NCP15WB473,44 NTC_NCP15WL333,45 NTC_NCP15XH103,46 NTC_NCP18WB473,47 NTC_NCP21WB473,48 NTC_SSG1404001221,49 NTC_LAST,50};51 52static const struct platform_device_id ntc_thermistor_id[] = {53 [NTC_B57330V2103] = { "b57330v2103", TYPE_B57330V2103 },54 [NTC_B57891S0103] = { "b57891s0103", TYPE_B57891S0103 },55 [NTC_NCP03WB473] = { "ncp03wb473", TYPE_NCPXXWB473 },56 [NTC_NCP03WF104] = { "ncp03wf104", TYPE_NCPXXWF104 },57 [NTC_NCP15WB473] = { "ncp15wb473", TYPE_NCPXXWB473 },58 [NTC_NCP15WL333] = { "ncp15wl333", TYPE_NCPXXWL333 },59 [NTC_NCP15XH103] = { "ncp15xh103", TYPE_NCPXXXH103 },60 [NTC_NCP18WB473] = { "ncp18wb473", TYPE_NCPXXWB473 },61 [NTC_NCP21WB473] = { "ncp21wb473", TYPE_NCPXXWB473 },62 [NTC_SSG1404001221] = { "ssg1404_001221", TYPE_NCPXXWB473 },63 [NTC_LAST] = { },64};65MODULE_DEVICE_TABLE(platform, ntc_thermistor_id);66 67/*68 * A compensation table should be sorted by the values of .ohm69 * in descending order.70 * The following compensation tables are from the specification of Murata NTC71 * Thermistors Datasheet72 */73static const struct ntc_compensation ncpXXwb473[] = {74 { .temp_c = -40, .ohm = 1747920 },75 { .temp_c = -35, .ohm = 1245428 },76 { .temp_c = -30, .ohm = 898485 },77 { .temp_c = -25, .ohm = 655802 },78 { .temp_c = -20, .ohm = 483954 },79 { .temp_c = -15, .ohm = 360850 },80 { .temp_c = -10, .ohm = 271697 },81 { .temp_c = -5, .ohm = 206463 },82 { .temp_c = 0, .ohm = 158214 },83 { .temp_c = 5, .ohm = 122259 },84 { .temp_c = 10, .ohm = 95227 },85 { .temp_c = 15, .ohm = 74730 },86 { .temp_c = 20, .ohm = 59065 },87 { .temp_c = 25, .ohm = 47000 },88 { .temp_c = 30, .ohm = 37643 },89 { .temp_c = 35, .ohm = 30334 },90 { .temp_c = 40, .ohm = 24591 },91 { .temp_c = 45, .ohm = 20048 },92 { .temp_c = 50, .ohm = 16433 },93 { .temp_c = 55, .ohm = 13539 },94 { .temp_c = 60, .ohm = 11209 },95 { .temp_c = 65, .ohm = 9328 },96 { .temp_c = 70, .ohm = 7798 },97 { .temp_c = 75, .ohm = 6544 },98 { .temp_c = 80, .ohm = 5518 },99 { .temp_c = 85, .ohm = 4674 },100 { .temp_c = 90, .ohm = 3972 },101 { .temp_c = 95, .ohm = 3388 },102 { .temp_c = 100, .ohm = 2902 },103 { .temp_c = 105, .ohm = 2494 },104 { .temp_c = 110, .ohm = 2150 },105 { .temp_c = 115, .ohm = 1860 },106 { .temp_c = 120, .ohm = 1615 },107 { .temp_c = 125, .ohm = 1406 },108};109static const struct ntc_compensation ncpXXwl333[] = {110 { .temp_c = -40, .ohm = 1610154 },111 { .temp_c = -35, .ohm = 1130850 },112 { .temp_c = -30, .ohm = 802609 },113 { .temp_c = -25, .ohm = 575385 },114 { .temp_c = -20, .ohm = 416464 },115 { .temp_c = -15, .ohm = 304219 },116 { .temp_c = -10, .ohm = 224193 },117 { .temp_c = -5, .ohm = 166623 },118 { .temp_c = 0, .ohm = 124850 },119 { .temp_c = 5, .ohm = 94287 },120 { .temp_c = 10, .ohm = 71747 },121 { .temp_c = 15, .ohm = 54996 },122 { .temp_c = 20, .ohm = 42455 },123 { .temp_c = 25, .ohm = 33000 },124 { .temp_c = 30, .ohm = 25822 },125 { .temp_c = 35, .ohm = 20335 },126 { .temp_c = 40, .ohm = 16115 },127 { .temp_c = 45, .ohm = 12849 },128 { .temp_c = 50, .ohm = 10306 },129 { .temp_c = 55, .ohm = 8314 },130 { .temp_c = 60, .ohm = 6746 },131 { .temp_c = 65, .ohm = 5503 },132 { .temp_c = 70, .ohm = 4513 },133 { .temp_c = 75, .ohm = 3721 },134 { .temp_c = 80, .ohm = 3084 },135 { .temp_c = 85, .ohm = 2569 },136 { .temp_c = 90, .ohm = 2151 },137 { .temp_c = 95, .ohm = 1809 },138 { .temp_c = 100, .ohm = 1529 },139 { .temp_c = 105, .ohm = 1299 },140 { .temp_c = 110, .ohm = 1108 },141 { .temp_c = 115, .ohm = 949 },142 { .temp_c = 120, .ohm = 817 },143 { .temp_c = 125, .ohm = 707 },144};145 146static const struct ntc_compensation ncpXXwf104[] = {147 { .temp_c = -40, .ohm = 4397119 },148 { .temp_c = -35, .ohm = 3088599 },149 { .temp_c = -30, .ohm = 2197225 },150 { .temp_c = -25, .ohm = 1581881 },151 { .temp_c = -20, .ohm = 1151037 },152 { .temp_c = -15, .ohm = 846579 },153 { .temp_c = -10, .ohm = 628988 },154 { .temp_c = -5, .ohm = 471632 },155 { .temp_c = 0, .ohm = 357012 },156 { .temp_c = 5, .ohm = 272500 },157 { .temp_c = 10, .ohm = 209710 },158 { .temp_c = 15, .ohm = 162651 },159 { .temp_c = 20, .ohm = 127080 },160 { .temp_c = 25, .ohm = 100000 },161 { .temp_c = 30, .ohm = 79222 },162 { .temp_c = 35, .ohm = 63167 },163 { .temp_c = 40, .ohm = 50677 },164 { .temp_c = 45, .ohm = 40904 },165 { .temp_c = 50, .ohm = 33195 },166 { .temp_c = 55, .ohm = 27091 },167 { .temp_c = 60, .ohm = 22224 },168 { .temp_c = 65, .ohm = 18323 },169 { .temp_c = 70, .ohm = 15184 },170 { .temp_c = 75, .ohm = 12635 },171 { .temp_c = 80, .ohm = 10566 },172 { .temp_c = 85, .ohm = 8873 },173 { .temp_c = 90, .ohm = 7481 },174 { .temp_c = 95, .ohm = 6337 },175 { .temp_c = 100, .ohm = 5384 },176 { .temp_c = 105, .ohm = 4594 },177 { .temp_c = 110, .ohm = 3934 },178 { .temp_c = 115, .ohm = 3380 },179 { .temp_c = 120, .ohm = 2916 },180 { .temp_c = 125, .ohm = 2522 },181};182 183static const struct ntc_compensation ncpXXxh103[] = {184 { .temp_c = -40, .ohm = 247565 },185 { .temp_c = -35, .ohm = 181742 },186 { .temp_c = -30, .ohm = 135128 },187 { .temp_c = -25, .ohm = 101678 },188 { .temp_c = -20, .ohm = 77373 },189 { .temp_c = -15, .ohm = 59504 },190 { .temp_c = -10, .ohm = 46222 },191 { .temp_c = -5, .ohm = 36244 },192 { .temp_c = 0, .ohm = 28674 },193 { .temp_c = 5, .ohm = 22878 },194 { .temp_c = 10, .ohm = 18399 },195 { .temp_c = 15, .ohm = 14910 },196 { .temp_c = 20, .ohm = 12169 },197 { .temp_c = 25, .ohm = 10000 },198 { .temp_c = 30, .ohm = 8271 },199 { .temp_c = 35, .ohm = 6883 },200 { .temp_c = 40, .ohm = 5762 },201 { .temp_c = 45, .ohm = 4851 },202 { .temp_c = 50, .ohm = 4105 },203 { .temp_c = 55, .ohm = 3492 },204 { .temp_c = 60, .ohm = 2985 },205 { .temp_c = 65, .ohm = 2563 },206 { .temp_c = 70, .ohm = 2211 },207 { .temp_c = 75, .ohm = 1915 },208 { .temp_c = 80, .ohm = 1666 },209 { .temp_c = 85, .ohm = 1454 },210 { .temp_c = 90, .ohm = 1275 },211 { .temp_c = 95, .ohm = 1121 },212 { .temp_c = 100, .ohm = 990 },213 { .temp_c = 105, .ohm = 876 },214 { .temp_c = 110, .ohm = 779 },215 { .temp_c = 115, .ohm = 694 },216 { .temp_c = 120, .ohm = 620 },217 { .temp_c = 125, .ohm = 556 },218};219 220/*221 * The following compensation tables are from the specifications in EPCOS NTC222 * Thermistors Datasheets223 */224static const struct ntc_compensation b57330v2103[] = {225 { .temp_c = -40, .ohm = 190030 },226 { .temp_c = -35, .ohm = 145360 },227 { .temp_c = -30, .ohm = 112060 },228 { .temp_c = -25, .ohm = 87041 },229 { .temp_c = -20, .ohm = 68104 },230 { .temp_c = -15, .ohm = 53665 },231 { .temp_c = -10, .ohm = 42576 },232 { .temp_c = -5, .ohm = 34001 },233 { .temp_c = 0, .ohm = 27326 },234 { .temp_c = 5, .ohm = 22096 },235 { .temp_c = 10, .ohm = 17973 },236 { .temp_c = 15, .ohm = 14703 },237 { .temp_c = 20, .ohm = 12090 },238 { .temp_c = 25, .ohm = 10000 },239 { .temp_c = 30, .ohm = 8311 },240 { .temp_c = 35, .ohm = 6941 },241 { .temp_c = 40, .ohm = 5825 },242 { .temp_c = 45, .ohm = 4911 },243 { .temp_c = 50, .ohm = 4158 },244 { .temp_c = 55, .ohm = 3536 },245 { .temp_c = 60, .ohm = 3019 },246 { .temp_c = 65, .ohm = 2588 },247 { .temp_c = 70, .ohm = 2227 },248 { .temp_c = 75, .ohm = 1924 },249 { .temp_c = 80, .ohm = 1668 },250 { .temp_c = 85, .ohm = 1451 },251 { .temp_c = 90, .ohm = 1266 },252 { .temp_c = 95, .ohm = 1108 },253 { .temp_c = 100, .ohm = 973 },254 { .temp_c = 105, .ohm = 857 },255 { .temp_c = 110, .ohm = 757 },256 { .temp_c = 115, .ohm = 671 },257 { .temp_c = 120, .ohm = 596 },258 { .temp_c = 125, .ohm = 531 },259};260 261static const struct ntc_compensation b57891s0103[] = {262 { .temp_c = -55.0, .ohm = 878900 },263 { .temp_c = -50.0, .ohm = 617590 },264 { .temp_c = -45.0, .ohm = 439340 },265 { .temp_c = -40.0, .ohm = 316180 },266 { .temp_c = -35.0, .ohm = 230060 },267 { .temp_c = -30.0, .ohm = 169150 },268 { .temp_c = -25.0, .ohm = 125550 },269 { .temp_c = -20.0, .ohm = 94143 },270 { .temp_c = -15.0, .ohm = 71172 },271 { .temp_c = -10.0, .ohm = 54308 },272 { .temp_c = -5.0, .ohm = 41505 },273 { .temp_c = 0.0, .ohm = 32014 },274 { .temp_c = 5.0, .ohm = 25011 },275 { .temp_c = 10.0, .ohm = 19691 },276 { .temp_c = 15.0, .ohm = 15618 },277 { .temp_c = 20.0, .ohm = 12474 },278 { .temp_c = 25.0, .ohm = 10000 },279 { .temp_c = 30.0, .ohm = 8080 },280 { .temp_c = 35.0, .ohm = 6569 },281 { .temp_c = 40.0, .ohm = 5372 },282 { .temp_c = 45.0, .ohm = 4424 },283 { .temp_c = 50.0, .ohm = 3661 },284 { .temp_c = 55.0, .ohm = 3039 },285 { .temp_c = 60.0, .ohm = 2536 },286 { .temp_c = 65.0, .ohm = 2128 },287 { .temp_c = 70.0, .ohm = 1794 },288 { .temp_c = 75.0, .ohm = 1518 },289 { .temp_c = 80.0, .ohm = 1290 },290 { .temp_c = 85.0, .ohm = 1100 },291 { .temp_c = 90.0, .ohm = 942 },292 { .temp_c = 95.0, .ohm = 809 },293 { .temp_c = 100.0, .ohm = 697 },294 { .temp_c = 105.0, .ohm = 604 },295 { .temp_c = 110.0, .ohm = 525 },296 { .temp_c = 115.0, .ohm = 457 },297 { .temp_c = 120.0, .ohm = 400 },298 { .temp_c = 125.0, .ohm = 351 },299 { .temp_c = 130.0, .ohm = 308 },300 { .temp_c = 135.0, .ohm = 272 },301 { .temp_c = 140.0, .ohm = 240 },302 { .temp_c = 145.0, .ohm = 213 },303 { .temp_c = 150.0, .ohm = 189 },304 { .temp_c = 155.0, .ohm = 168 },305};306 307struct ntc_type {308 const struct ntc_compensation *comp;309 int n_comp;310};311 312#define NTC_TYPE(ntc, compensation) \313[(ntc)] = { .comp = (compensation), .n_comp = ARRAY_SIZE(compensation) }314 315static const struct ntc_type ntc_type[] = {316 NTC_TYPE(TYPE_B57330V2103, b57330v2103),317 NTC_TYPE(TYPE_B57891S0103, b57891s0103),318 NTC_TYPE(TYPE_NCPXXWB473, ncpXXwb473),319 NTC_TYPE(TYPE_NCPXXWF104, ncpXXwf104),320 NTC_TYPE(TYPE_NCPXXWL333, ncpXXwl333),321 NTC_TYPE(TYPE_NCPXXXH103, ncpXXxh103),322};323 324/*325 * pullup_uV, pullup_ohm, pulldown_ohm, and connect are required.326 *327 * How to setup pullup_ohm, pulldown_ohm, and connect is328 * described at Documentation/hwmon/ntc_thermistor.rst329 *330 * pullup/down_ohm: 0 for infinite / not-connected331 *332 * chan: iio_channel pointer to communicate with the ADC which the333 * thermistor is using for conversion of the analog values.334 */335struct ntc_data {336 const struct ntc_compensation *comp;337 int n_comp;338 unsigned int pullup_uv;339 unsigned int pullup_ohm;340 unsigned int pulldown_ohm;341 enum { NTC_CONNECTED_POSITIVE, NTC_CONNECTED_GROUND } connect;342 struct iio_channel *chan;343};344 345static int ntc_adc_iio_read(struct ntc_data *data)346{347 struct iio_channel *channel = data->chan;348 int uv, ret;349 350 ret = iio_read_channel_processed_scale(channel, &uv, 1000);351 if (ret < 0) {352 int raw;353 354 /*355 * This fallback uses a raw read and then356 * assumes the ADC is 12 bits, scaling with357 * a factor 1000 to get to microvolts.358 */359 ret = iio_read_channel_raw(channel, &raw);360 if (ret < 0) {361 pr_err("read channel() error: %d\n", ret);362 return ret;363 }364 ret = iio_convert_raw_to_processed(channel, raw, &uv, 1000);365 if (ret < 0) {366 /* Assume 12 bit ADC with vref at pullup_uv */367 uv = (data->pullup_uv * (s64)raw) >> 12;368 }369 }370 371 return uv;372}373 374static inline u64 div64_u64_safe(u64 dividend, u64 divisor)375{376 if (divisor == 0 && dividend == 0)377 return 0;378 if (divisor == 0)379 return UINT_MAX;380 return div64_u64(dividend, divisor);381}382 383static int get_ohm_of_thermistor(struct ntc_data *data, unsigned int uv)384{385 u32 puv = data->pullup_uv;386 u64 n, puo, pdo;387 puo = data->pullup_ohm;388 pdo = data->pulldown_ohm;389 390 if (uv == 0)391 return (data->connect == NTC_CONNECTED_POSITIVE) ?392 INT_MAX : 0;393 if (uv >= puv)394 return (data->connect == NTC_CONNECTED_POSITIVE) ?395 0 : INT_MAX;396 397 if (data->connect == NTC_CONNECTED_POSITIVE && puo == 0)398 n = div_u64(pdo * (puv - uv), uv);399 else if (data->connect == NTC_CONNECTED_GROUND && pdo == 0)400 n = div_u64(puo * uv, puv - uv);401 else if (data->connect == NTC_CONNECTED_POSITIVE)402 n = div64_u64_safe(pdo * puo * (puv - uv),403 puo * uv - pdo * (puv - uv));404 else405 n = div64_u64_safe(pdo * puo * uv, pdo * (puv - uv) - puo * uv);406 407 if (n > INT_MAX)408 n = INT_MAX;409 return n;410}411 412static void lookup_comp(struct ntc_data *data, unsigned int ohm,413 int *i_low, int *i_high)414{415 int start, end, mid;416 417 /*418 * Handle special cases: Resistance is higher than or equal to419 * resistance in first table entry, or resistance is lower or equal420 * to resistance in last table entry.421 * In these cases, return i_low == i_high, either pointing to the422 * beginning or to the end of the table depending on the condition.423 */424 if (ohm >= data->comp[0].ohm) {425 *i_low = 0;426 *i_high = 0;427 return;428 }429 if (ohm <= data->comp[data->n_comp - 1].ohm) {430 *i_low = data->n_comp - 1;431 *i_high = data->n_comp - 1;432 return;433 }434 435 /* Do a binary search on compensation table */436 start = 0;437 end = data->n_comp;438 while (start < end) {439 mid = start + (end - start) / 2;440 /*441 * start <= mid < end442 * data->comp[start].ohm > ohm >= data->comp[end].ohm443 *444 * We could check for "ohm == data->comp[mid].ohm" here, but445 * that is a quite unlikely condition, and we would have to446 * check again after updating start. Check it at the end instead447 * for simplicity.448 */449 if (ohm >= data->comp[mid].ohm) {450 end = mid;451 } else {452 start = mid + 1;453 /*454 * ohm >= data->comp[start].ohm might be true here,455 * since we set start to mid + 1. In that case, we are456 * done. We could keep going, but the condition is quite457 * likely to occur, so it is worth checking for it.458 */459 if (ohm >= data->comp[start].ohm)460 end = start;461 }462 /*463 * start <= end464 * data->comp[start].ohm >= ohm >= data->comp[end].ohm465 */466 }467 /*468 * start == end469 * ohm >= data->comp[end].ohm470 */471 *i_low = end;472 if (ohm == data->comp[end].ohm)473 *i_high = end;474 else475 *i_high = end - 1;476}477 478static int get_temp_mc(struct ntc_data *data, unsigned int ohm)479{480 int low, high;481 int temp;482 483 lookup_comp(data, ohm, &low, &high);484 /*485 * First multiplying the table temperatures with 1000 to get to486 * millicentigrades (which is what we want) and then interpolating487 * will give the best precision.488 */489 temp = fixp_linear_interpolate(data->comp[low].ohm,490 data->comp[low].temp_c * 1000,491 data->comp[high].ohm,492 data->comp[high].temp_c * 1000,493 ohm);494 return temp;495}496 497static int ntc_thermistor_get_ohm(struct ntc_data *data)498{499 int read_uv;500 501 read_uv = ntc_adc_iio_read(data);502 if (read_uv < 0)503 return read_uv;504 return get_ohm_of_thermistor(data, read_uv);505}506 507static int ntc_read(struct device *dev, enum hwmon_sensor_types type,508 u32 attr, int channel, long *val)509{510 struct ntc_data *data = dev_get_drvdata(dev);511 int ohm;512 513 switch (type) {514 case hwmon_temp:515 switch (attr) {516 case hwmon_temp_input:517 ohm = ntc_thermistor_get_ohm(data);518 if (ohm < 0)519 return ohm;520 *val = get_temp_mc(data, ohm);521 return 0;522 case hwmon_temp_type:523 *val = 4;524 return 0;525 default:526 break;527 }528 break;529 default:530 break;531 }532 return -EINVAL;533}534 535static umode_t ntc_is_visible(const void *data, enum hwmon_sensor_types type,536 u32 attr, int channel)537{538 if (type == hwmon_temp) {539 switch (attr) {540 case hwmon_temp_input:541 case hwmon_temp_type:542 return 0444;543 default:544 break;545 }546 }547 return 0;548}549 550static const struct hwmon_channel_info * const ntc_info[] = {551 HWMON_CHANNEL_INFO(chip, HWMON_C_REGISTER_TZ),552 HWMON_CHANNEL_INFO(temp, HWMON_T_INPUT | HWMON_T_TYPE),553 NULL554};555 556static const struct hwmon_ops ntc_hwmon_ops = {557 .is_visible = ntc_is_visible,558 .read = ntc_read,559};560 561static const struct hwmon_chip_info ntc_chip_info = {562 .ops = &ntc_hwmon_ops,563 .info = ntc_info,564};565 566static int ntc_thermistor_parse_props(struct device *dev,567 struct ntc_data *data)568{569 struct iio_channel *chan;570 enum iio_chan_type type;571 int ret;572 573 chan = devm_iio_channel_get(dev, NULL);574 if (IS_ERR(chan))575 return PTR_ERR(chan);576 577 ret = iio_get_channel_type(chan, &type);578 if (ret < 0)579 return ret;580 581 if (type != IIO_VOLTAGE)582 return -EINVAL;583 584 ret = device_property_read_u32(dev, "pullup-uv", &data->pullup_uv);585 if (ret)586 return dev_err_probe(dev, ret, "pullup-uv not specified\n");587 588 ret = device_property_read_u32(dev, "pullup-ohm", &data->pullup_ohm);589 if (ret)590 return dev_err_probe(dev, ret, "pullup-ohm not specified\n");591 592 ret = device_property_read_u32(dev, "pulldown-ohm", &data->pulldown_ohm);593 if (ret)594 return dev_err_probe(dev, ret, "pulldown-ohm not specified\n");595 596 if (device_property_read_bool(dev, "connected-positive"))597 data->connect = NTC_CONNECTED_POSITIVE;598 else /* status change should be possible if not always on. */599 data->connect = NTC_CONNECTED_GROUND;600 601 data->chan = chan;602 603 return 0;604}605 606static int ntc_thermistor_probe(struct platform_device *pdev)607{608 struct device *dev = &pdev->dev;609 const struct platform_device_id *pdev_id;610 struct device *hwmon_dev;611 struct ntc_data *data;612 int ret;613 614 data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);615 if (!data)616 return -ENOMEM;617 618 ret = ntc_thermistor_parse_props(dev, data);619 if (ret)620 return ret;621 622 if (data->pullup_uv == 0 ||623 (data->pullup_ohm == 0 && data->connect ==624 NTC_CONNECTED_GROUND) ||625 (data->pulldown_ohm == 0 && data->connect ==626 NTC_CONNECTED_POSITIVE) ||627 (data->connect != NTC_CONNECTED_POSITIVE &&628 data->connect != NTC_CONNECTED_GROUND)) {629 dev_err(dev, "Required data to use NTC driver not supplied.\n");630 return -EINVAL;631 }632 633 pdev_id = device_get_match_data(dev);634 635 if (pdev_id->driver_data >= ARRAY_SIZE(ntc_type)) {636 dev_err(dev, "Unknown device type: %lu(%s)\n",637 pdev_id->driver_data, pdev_id->name);638 return -EINVAL;639 }640 641 data->comp = ntc_type[pdev_id->driver_data].comp;642 data->n_comp = ntc_type[pdev_id->driver_data].n_comp;643 644 hwmon_dev = devm_hwmon_device_register_with_info(dev, pdev_id->name,645 data, &ntc_chip_info,646 NULL);647 if (IS_ERR(hwmon_dev)) {648 dev_err(dev, "unable to register as hwmon device.\n");649 return PTR_ERR(hwmon_dev);650 }651 652 dev_info(dev, "Thermistor type: %s successfully probed.\n",653 pdev_id->name);654 655 return 0;656}657 658static const struct of_device_id ntc_match[] = {659 { .compatible = "epcos,b57330v2103",660 .data = &ntc_thermistor_id[NTC_B57330V2103]},661 { .compatible = "epcos,b57891s0103",662 .data = &ntc_thermistor_id[NTC_B57891S0103] },663 { .compatible = "murata,ncp03wb473",664 .data = &ntc_thermistor_id[NTC_NCP03WB473] },665 { .compatible = "murata,ncp03wf104",666 .data = &ntc_thermistor_id[NTC_NCP03WF104] },667 { .compatible = "murata,ncp15wb473",668 .data = &ntc_thermistor_id[NTC_NCP15WB473] },669 { .compatible = "murata,ncp15wl333",670 .data = &ntc_thermistor_id[NTC_NCP15WL333] },671 { .compatible = "murata,ncp15xh103",672 .data = &ntc_thermistor_id[NTC_NCP15XH103] },673 { .compatible = "murata,ncp18wb473",674 .data = &ntc_thermistor_id[NTC_NCP18WB473] },675 { .compatible = "murata,ncp21wb473",676 .data = &ntc_thermistor_id[NTC_NCP21WB473] },677 { .compatible = "samsung,1404-001221",678 .data = &ntc_thermistor_id[NTC_SSG1404001221] },679 680 /* Usage of vendor name "ntc" is deprecated */681 { .compatible = "ntc,ncp03wb473",682 .data = &ntc_thermistor_id[NTC_NCP03WB473] },683 { .compatible = "ntc,ncp15wb473",684 .data = &ntc_thermistor_id[NTC_NCP15WB473] },685 { .compatible = "ntc,ncp15wl333",686 .data = &ntc_thermistor_id[NTC_NCP15WL333] },687 { .compatible = "ntc,ncp18wb473",688 .data = &ntc_thermistor_id[NTC_NCP18WB473] },689 { .compatible = "ntc,ncp21wb473",690 .data = &ntc_thermistor_id[NTC_NCP21WB473] },691 { },692};693MODULE_DEVICE_TABLE(of, ntc_match);694 695static struct platform_driver ntc_thermistor_driver = {696 .driver = {697 .name = "ntc-thermistor",698 .of_match_table = ntc_match,699 },700 .probe = ntc_thermistor_probe,701 .id_table = ntc_thermistor_id,702};703 704module_platform_driver(ntc_thermistor_driver);705 706MODULE_DESCRIPTION("NTC Thermistor Driver");707MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");708MODULE_LICENSE("GPL");709MODULE_ALIAS("platform:ntc-thermistor");710