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hwmon: (ntc_thermistor) fix iio raw to microvolts conversion
[people/ms/linux.git] / drivers / hwmon / ntc_thermistor.c
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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>
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29#include <linux/of.h>
30#include <linux/of_device.h>
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31
32#include <linux/platform_data/ntc_thermistor.h>
33
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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
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39#include <linux/hwmon.h>
40#include <linux/hwmon-sysfs.h>
c08860ff 41#include <linux/thermal.h>
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42
43struct ntc_compensation {
088ce2ac 44 int temp_c;
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45 unsigned int ohm;
46};
47
ead82d67 48/* Order matters, ntc_match references the entries by index */
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49static 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 },
ed67f087 55 { "b57330v2103", TYPE_B57330V2103},
887ee434 56 { "ncp03wf104", TYPE_NCPXXWF104 },
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57 { },
58};
59
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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 */
4626dcff 66static const struct ntc_compensation ncpXXwb473[] = {
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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 },
f22aaaa7 101};
4626dcff 102static const struct ntc_compensation ncpXXwl333[] = {
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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 },
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137};
138
887ee434
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139static 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
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176/*
177 * The following compensation table is from the specification of EPCOS NTC
178 * Thermistors Datasheet
179 */
180static 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
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217struct 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];
c08860ff 224 struct thermal_zone_device *tz;
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225};
226
59cf4243 227#if defined(CONFIG_OF) && IS_ENABLED(CONFIG_IIO)
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228static int ntc_adc_iio_read(struct ntc_thermistor_platform_data *pdata)
229{
230 struct iio_channel *channel = pdata->chan;
0315253b 231 int raw, uv, ret;
9e8269de 232
0315253b 233 ret = iio_read_channel_raw(channel, &raw);
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234 if (ret < 0) {
235 pr_err("read channel() error: %d\n", ret);
236 return ret;
237 }
238
0315253b
CL
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 }
9e8269de 244
0315253b 245 return uv;
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246}
247
248static const struct of_device_id ntc_match[] = {
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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] },
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259 { .compatible = "epcos,b57330v2103",
260 .data = &ntc_thermistor_id[5]},
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261 { .compatible = "murata,ncp03wf104",
262 .data = &ntc_thermistor_id[6] },
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263
264 /* Usage of vendor name "ntc" is deprecated */
9e8269de 265 { .compatible = "ntc,ncp15wb473",
ead82d67 266 .data = &ntc_thermistor_id[0] },
9e8269de 267 { .compatible = "ntc,ncp18wb473",
ead82d67 268 .data = &ntc_thermistor_id[1] },
9e8269de 269 { .compatible = "ntc,ncp21wb473",
ead82d67 270 .data = &ntc_thermistor_id[2] },
9e8269de 271 { .compatible = "ntc,ncp03wb473",
ead82d67 272 .data = &ntc_thermistor_id[3] },
9e8269de 273 { .compatible = "ntc,ncp15wl333",
ead82d67 274 .data = &ntc_thermistor_id[4] },
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275 { },
276};
277MODULE_DEVICE_TABLE(of, ntc_match);
278
279static struct ntc_thermistor_platform_data *
280ntc_thermistor_parse_dt(struct platform_device *pdev)
281{
282 struct iio_channel *chan;
adba6575 283 enum iio_chan_type type;
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284 struct device_node *np = pdev->dev.of_node;
285 struct ntc_thermistor_platform_data *pdata;
adba6575 286 int ret;
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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
adba6575
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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
088ce2ac 306 if (of_property_read_u32(np, "pullup-uv", &pdata->pullup_uv))
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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;
088ce2ac 319 pdata->read_uv = ntc_adc_iio_read;
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320
321 return pdata;
322}
323static 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
329static struct ntc_thermistor_platform_data *
330ntc_thermistor_parse_dt(struct platform_device *pdev)
331{
332 return NULL;
333}
334
59cf4243
JD
335#define ntc_match NULL
336
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337static void ntc_iio_channel_release(struct ntc_thermistor_platform_data *pdata)
338{ }
339#endif
340
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341static 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
088ce2ac 350static int get_ohm_of_thermistor(struct ntc_data *data, unsigned int uv)
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351{
352 struct ntc_thermistor_platform_data *pdata = data->pdata;
088ce2ac
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353 u64 mv = uv / 1000;
354 u64 pmv = pdata->pullup_uv / 1000;
355 u64 n, puo, pdo;
356 puo = pdata->pullup_ohm;
357 pdo = pdata->pulldown_ohm;
f22aaaa7 358
088ce2ac 359 if (mv == 0) {
f22aaaa7 360 if (pdata->connect == NTC_CONNECTED_POSITIVE)
dbe43a62 361 return INT_MAX;
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362 return 0;
363 }
088ce2ac 364 if (mv >= pmv)
f22aaaa7 365 return (pdata->connect == NTC_CONNECTED_POSITIVE) ?
dbe43a62 366 0 : INT_MAX;
f22aaaa7 367
088ce2ac
GR
368 if (pdata->connect == NTC_CONNECTED_POSITIVE && puo == 0)
369 n = div64_u64_safe(pdo * (pmv - mv), mv);
370 else if (pdata->connect == NTC_CONNECTED_GROUND && pdo == 0)
371 n = div64_u64_safe(puo * mv, pmv - mv);
f22aaaa7 372 else if (pdata->connect == NTC_CONNECTED_POSITIVE)
088ce2ac
GR
373 n = div64_u64_safe(pdo * puo * (pmv - mv),
374 puo * mv - pdo * (pmv - mv));
f22aaaa7 375 else
088ce2ac 376 n = div64_u64_safe(pdo * puo * mv, pdo * (pmv - mv) - puo * mv);
f22aaaa7 377
088ce2ac
GR
378 if (n > INT_MAX)
379 n = INT_MAX;
380 return n;
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381}
382
dbe43a62
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383static void lookup_comp(struct ntc_data *data, unsigned int ohm,
384 int *i_low, int *i_high)
f22aaaa7 385{
dbe43a62
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386 int start, end, mid;
387
388 /*
389 * Handle special cases: Resistance is higher than or equal to
390 * resistance in first table entry, or resistance is lower or equal
391 * to resistance in last table entry.
392 * In these cases, return i_low == i_high, either pointing to the
393 * beginning or to the end of the table depending on the condition.
394 */
395 if (ohm >= data->comp[0].ohm) {
396 *i_low = 0;
397 *i_high = 0;
398 return;
399 }
400 if (ohm <= data->comp[data->n_comp - 1].ohm) {
401 *i_low = data->n_comp - 1;
402 *i_high = data->n_comp - 1;
403 return;
404 }
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405
406 /* Do a binary search on compensation table */
407 start = 0;
408 end = data->n_comp;
dbe43a62 409 while (start < end) {
f22aaaa7 410 mid = start + (end - start) / 2;
dbe43a62
GR
411 /*
412 * start <= mid < end
413 * data->comp[start].ohm > ohm >= data->comp[end].ohm
414 *
415 * We could check for "ohm == data->comp[mid].ohm" here, but
416 * that is a quite unlikely condition, and we would have to
417 * check again after updating start. Check it at the end instead
418 * for simplicity.
419 */
420 if (ohm >= data->comp[mid].ohm) {
f22aaaa7 421 end = mid;
f22aaaa7 422 } else {
dbe43a62
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423 start = mid + 1;
424 /*
425 * ohm >= data->comp[start].ohm might be true here,
426 * since we set start to mid + 1. In that case, we are
427 * done. We could keep going, but the condition is quite
428 * likely to occur, so it is worth checking for it.
429 */
430 if (ohm >= data->comp[start].ohm)
431 end = start;
f22aaaa7 432 }
dbe43a62
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433 /*
434 * start <= end
435 * data->comp[start].ohm >= ohm >= data->comp[end].ohm
436 */
f22aaaa7 437 }
dbe43a62
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438 /*
439 * start == end
440 * ohm >= data->comp[end].ohm
441 */
442 *i_low = end;
443 if (ohm == data->comp[end].ohm)
444 *i_high = end;
445 else
446 *i_high = end - 1;
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447}
448
088ce2ac 449static int get_temp_mc(struct ntc_data *data, unsigned int ohm)
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450{
451 int low, high;
dbe43a62 452 int temp;
f22aaaa7 453
dbe43a62
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454 lookup_comp(data, ohm, &low, &high);
455 if (low == high) {
f22aaaa7 456 /* Unable to use linear approximation */
088ce2ac 457 temp = data->comp[low].temp_c * 1000;
f22aaaa7 458 } else {
088ce2ac
GR
459 temp = data->comp[low].temp_c * 1000 +
460 ((data->comp[high].temp_c - data->comp[low].temp_c) *
f22aaaa7
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461 1000 * ((int)ohm - (int)data->comp[low].ohm)) /
462 ((int)data->comp[high].ohm - (int)data->comp[low].ohm);
463 }
dbe43a62 464 return temp;
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465}
466
dbe43a62 467static int ntc_thermistor_get_ohm(struct ntc_data *data)
f22aaaa7 468{
088ce2ac 469 int read_uv;
f22aaaa7 470
dbe43a62
GR
471 if (data->pdata->read_ohm)
472 return data->pdata->read_ohm();
f22aaaa7 473
088ce2ac
GR
474 if (data->pdata->read_uv) {
475 read_uv = data->pdata->read_uv(data->pdata);
476 if (read_uv < 0)
477 return read_uv;
478 return get_ohm_of_thermistor(data, read_uv);
f22aaaa7 479 }
dbe43a62 480 return -EINVAL;
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481}
482
c08860ff
JL
483static int ntc_read_temp(void *dev, long *temp)
484{
485 struct ntc_data *data = dev_get_drvdata(dev);
486 int ohm;
487
488 ohm = ntc_thermistor_get_ohm(data);
489 if (ohm < 0)
490 return ohm;
491
492 *temp = get_temp_mc(data, ohm);
493
494 return 0;
495}
496
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497static ssize_t ntc_show_name(struct device *dev,
498 struct device_attribute *attr, char *buf)
499{
500 struct ntc_data *data = dev_get_drvdata(dev);
501
502 return sprintf(buf, "%s\n", data->name);
503}
504
505static ssize_t ntc_show_type(struct device *dev,
506 struct device_attribute *attr, char *buf)
507{
508 return sprintf(buf, "4\n");
509}
510
511static ssize_t ntc_show_temp(struct device *dev,
512 struct device_attribute *attr, char *buf)
513{
514 struct ntc_data *data = dev_get_drvdata(dev);
dbe43a62
GR
515 int ohm;
516
517 ohm = ntc_thermistor_get_ohm(data);
518 if (ohm < 0)
519 return ohm;
f22aaaa7 520
088ce2ac 521 return sprintf(buf, "%d\n", get_temp_mc(data, ohm));
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522}
523
524static SENSOR_DEVICE_ATTR(temp1_type, S_IRUGO, ntc_show_type, NULL, 0);
525static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, ntc_show_temp, NULL, 0);
526static DEVICE_ATTR(name, S_IRUGO, ntc_show_name, NULL);
527
528static struct attribute *ntc_attributes[] = {
529 &dev_attr_name.attr,
530 &sensor_dev_attr_temp1_type.dev_attr.attr,
531 &sensor_dev_attr_temp1_input.dev_attr.attr,
532 NULL,
533};
534
535static const struct attribute_group ntc_attr_group = {
536 .attrs = ntc_attributes,
537};
538
2251aef6
EV
539static const struct thermal_zone_of_device_ops ntc_of_thermal_ops = {
540 .get_temp = ntc_read_temp,
541};
542
6c931ae1 543static int ntc_thermistor_probe(struct platform_device *pdev)
f22aaaa7 544{
9e8269de
NKC
545 const struct of_device_id *of_id =
546 of_match_device(of_match_ptr(ntc_match), &pdev->dev);
547 const struct platform_device_id *pdev_id;
548 struct ntc_thermistor_platform_data *pdata;
f22aaaa7 549 struct ntc_data *data;
9e8269de
NKC
550 int ret;
551
552 pdata = ntc_thermistor_parse_dt(pdev);
553 if (IS_ERR(pdata))
554 return PTR_ERR(pdata);
555 else if (pdata == NULL)
a8b3a3a5 556 pdata = dev_get_platdata(&pdev->dev);
f22aaaa7
DK
557
558 if (!pdata) {
559 dev_err(&pdev->dev, "No platform init data supplied.\n");
560 return -ENODEV;
561 }
562
563 /* Either one of the two is required. */
088ce2ac 564 if (!pdata->read_uv && !pdata->read_ohm) {
a7871def 565 dev_err(&pdev->dev,
088ce2ac 566 "Both read_uv and read_ohm missing. Need either one of the two.\n");
f22aaaa7
DK
567 return -EINVAL;
568 }
569
088ce2ac 570 if (pdata->read_uv && pdata->read_ohm) {
a7871def 571 dev_warn(&pdev->dev,
088ce2ac
GR
572 "Only one of read_uv and read_ohm is needed; ignoring read_uv.\n");
573 pdata->read_uv = NULL;
f22aaaa7
DK
574 }
575
088ce2ac 576 if (pdata->read_uv && (pdata->pullup_uv == 0 ||
f22aaaa7
DK
577 (pdata->pullup_ohm == 0 && pdata->connect ==
578 NTC_CONNECTED_GROUND) ||
579 (pdata->pulldown_ohm == 0 && pdata->connect ==
580 NTC_CONNECTED_POSITIVE) ||
581 (pdata->connect != NTC_CONNECTED_POSITIVE &&
582 pdata->connect != NTC_CONNECTED_GROUND))) {
a7871def 583 dev_err(&pdev->dev,
088ce2ac 584 "Required data to use read_uv not supplied.\n");
f22aaaa7
DK
585 return -EINVAL;
586 }
587
41141e64 588 data = devm_kzalloc(&pdev->dev, sizeof(struct ntc_data), GFP_KERNEL);
f22aaaa7
DK
589 if (!data)
590 return -ENOMEM;
591
9e8269de
NKC
592 pdev_id = of_id ? of_id->data : platform_get_device_id(pdev);
593
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DK
594 data->dev = &pdev->dev;
595 data->pdata = pdata;
9e8269de 596 strlcpy(data->name, pdev_id->name, sizeof(data->name));
f22aaaa7 597
9e8269de 598 switch (pdev_id->driver_data) {
f22aaaa7
DK
599 case TYPE_NCPXXWB473:
600 data->comp = ncpXXwb473;
601 data->n_comp = ARRAY_SIZE(ncpXXwb473);
602 break;
603 case TYPE_NCPXXWL333:
604 data->comp = ncpXXwl333;
605 data->n_comp = ARRAY_SIZE(ncpXXwl333);
606 break;
ed67f087
JP
607 case TYPE_B57330V2103:
608 data->comp = b57330v2103;
609 data->n_comp = ARRAY_SIZE(b57330v2103);
610 break;
887ee434
BS
611 case TYPE_NCPXXWF104:
612 data->comp = ncpXXwf104;
613 data->n_comp = ARRAY_SIZE(ncpXXwf104);
614 break;
f22aaaa7
DK
615 default:
616 dev_err(&pdev->dev, "Unknown device type: %lu(%s)\n",
9e8269de 617 pdev_id->driver_data, pdev_id->name);
41141e64 618 return -EINVAL;
f22aaaa7
DK
619 }
620
621 platform_set_drvdata(pdev, data);
622
623 ret = sysfs_create_group(&data->dev->kobj, &ntc_attr_group);
624 if (ret) {
625 dev_err(data->dev, "unable to create sysfs files\n");
41141e64 626 return ret;
f22aaaa7
DK
627 }
628
629 data->hwmon_dev = hwmon_device_register(data->dev);
425d2476 630 if (IS_ERR(data->hwmon_dev)) {
f22aaaa7 631 dev_err(data->dev, "unable to register as hwmon device.\n");
425d2476 632 ret = PTR_ERR(data->hwmon_dev);
f22aaaa7
DK
633 goto err_after_sysfs;
634 }
635
9e8269de 636 dev_info(&pdev->dev, "Thermistor type: %s successfully probed.\n",
93a88ef3 637 pdev_id->name);
9e8269de 638
c08860ff 639 data->tz = thermal_zone_of_sensor_register(data->dev, 0, data->dev,
2251aef6 640 &ntc_of_thermal_ops);
c08860ff
JL
641 if (IS_ERR(data->tz)) {
642 dev_dbg(&pdev->dev, "Failed to register to thermal fw.\n");
643 data->tz = NULL;
644 }
645
f22aaaa7
DK
646 return 0;
647err_after_sysfs:
648 sysfs_remove_group(&data->dev->kobj, &ntc_attr_group);
9e8269de 649 ntc_iio_channel_release(pdata);
f22aaaa7
DK
650 return ret;
651}
652
281dfd0b 653static int ntc_thermistor_remove(struct platform_device *pdev)
f22aaaa7
DK
654{
655 struct ntc_data *data = platform_get_drvdata(pdev);
9e8269de 656 struct ntc_thermistor_platform_data *pdata = data->pdata;
f22aaaa7
DK
657
658 hwmon_device_unregister(data->hwmon_dev);
659 sysfs_remove_group(&data->dev->kobj, &ntc_attr_group);
9e8269de 660 ntc_iio_channel_release(pdata);
f22aaaa7 661
c08860ff
JL
662 thermal_zone_of_sensor_unregister(data->dev, data->tz);
663
f22aaaa7
DK
664 return 0;
665}
666
f22aaaa7
DK
667static struct platform_driver ntc_thermistor_driver = {
668 .driver = {
669 .name = "ntc-thermistor",
9e8269de 670 .of_match_table = of_match_ptr(ntc_match),
f22aaaa7
DK
671 },
672 .probe = ntc_thermistor_probe,
9e5e9b7a 673 .remove = ntc_thermistor_remove,
f22aaaa7
DK
674 .id_table = ntc_thermistor_id,
675};
676
25a236a5 677module_platform_driver(ntc_thermistor_driver);
f22aaaa7 678
ed67f087 679MODULE_DESCRIPTION("NTC Thermistor Driver");
f22aaaa7
DK
680MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
681MODULE_LICENSE("GPL");
682MODULE_ALIAS("platform:ntc-thermistor");