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8
9#include <linux/slab.h>
10#include <linux/module.h>
11#include <linux/math64.h>
12#include <linux/platform_device.h>
13#include <linux/err.h>
14#include <linux/of.h>
15#include <linux/of_device.h>
16#include <linux/fixp-arith.h>
17
18#include <linux/platform_data/ntc_thermistor.h>
19
20#include <linux/iio/consumer.h>
21
22#include <linux/hwmon.h>
23
24struct ntc_compensation {
25 int temp_c;
26 unsigned int ohm;
27};
28
29
30
31
32
33enum {
34 NTC_B57330V2103,
35 NTC_B57891S0103,
36 NTC_NCP03WB473,
37 NTC_NCP03WF104,
38 NTC_NCP15WB473,
39 NTC_NCP15WL333,
40 NTC_NCP15XH103,
41 NTC_NCP18WB473,
42 NTC_NCP21WB473,
43 NTC_LAST,
44};
45
46static const struct platform_device_id ntc_thermistor_id[] = {
47 [NTC_B57330V2103] = { "b57330v2103", TYPE_B57330V2103 },
48 [NTC_B57891S0103] = { "b57891s0103", TYPE_B57891S0103 },
49 [NTC_NCP03WB473] = { "ncp03wb473", TYPE_NCPXXWB473 },
50 [NTC_NCP03WF104] = { "ncp03wf104", TYPE_NCPXXWF104 },
51 [NTC_NCP15WB473] = { "ncp15wb473", TYPE_NCPXXWB473 },
52 [NTC_NCP15WL333] = { "ncp15wl333", TYPE_NCPXXWL333 },
53 [NTC_NCP15XH103] = { "ncp15xh103", TYPE_NCPXXXH103 },
54 [NTC_NCP18WB473] = { "ncp18wb473", TYPE_NCPXXWB473 },
55 [NTC_NCP21WB473] = { "ncp21wb473", TYPE_NCPXXWB473 },
56 [NTC_LAST] = { },
57};
58
59
60
61
62
63
64
65static const struct ntc_compensation ncpXXwb473[] = {
66 { .temp_c = -40, .ohm = 1747920 },
67 { .temp_c = -35, .ohm = 1245428 },
68 { .temp_c = -30, .ohm = 898485 },
69 { .temp_c = -25, .ohm = 655802 },
70 { .temp_c = -20, .ohm = 483954 },
71 { .temp_c = -15, .ohm = 360850 },
72 { .temp_c = -10, .ohm = 271697 },
73 { .temp_c = -5, .ohm = 206463 },
74 { .temp_c = 0, .ohm = 158214 },
75 { .temp_c = 5, .ohm = 122259 },
76 { .temp_c = 10, .ohm = 95227 },
77 { .temp_c = 15, .ohm = 74730 },
78 { .temp_c = 20, .ohm = 59065 },
79 { .temp_c = 25, .ohm = 47000 },
80 { .temp_c = 30, .ohm = 37643 },
81 { .temp_c = 35, .ohm = 30334 },
82 { .temp_c = 40, .ohm = 24591 },
83 { .temp_c = 45, .ohm = 20048 },
84 { .temp_c = 50, .ohm = 16433 },
85 { .temp_c = 55, .ohm = 13539 },
86 { .temp_c = 60, .ohm = 11209 },
87 { .temp_c = 65, .ohm = 9328 },
88 { .temp_c = 70, .ohm = 7798 },
89 { .temp_c = 75, .ohm = 6544 },
90 { .temp_c = 80, .ohm = 5518 },
91 { .temp_c = 85, .ohm = 4674 },
92 { .temp_c = 90, .ohm = 3972 },
93 { .temp_c = 95, .ohm = 3388 },
94 { .temp_c = 100, .ohm = 2902 },
95 { .temp_c = 105, .ohm = 2494 },
96 { .temp_c = 110, .ohm = 2150 },
97 { .temp_c = 115, .ohm = 1860 },
98 { .temp_c = 120, .ohm = 1615 },
99 { .temp_c = 125, .ohm = 1406 },
100};
101static const struct ntc_compensation ncpXXwl333[] = {
102 { .temp_c = -40, .ohm = 1610154 },
103 { .temp_c = -35, .ohm = 1130850 },
104 { .temp_c = -30, .ohm = 802609 },
105 { .temp_c = -25, .ohm = 575385 },
106 { .temp_c = -20, .ohm = 416464 },
107 { .temp_c = -15, .ohm = 304219 },
108 { .temp_c = -10, .ohm = 224193 },
109 { .temp_c = -5, .ohm = 166623 },
110 { .temp_c = 0, .ohm = 124850 },
111 { .temp_c = 5, .ohm = 94287 },
112 { .temp_c = 10, .ohm = 71747 },
113 { .temp_c = 15, .ohm = 54996 },
114 { .temp_c = 20, .ohm = 42455 },
115 { .temp_c = 25, .ohm = 33000 },
116 { .temp_c = 30, .ohm = 25822 },
117 { .temp_c = 35, .ohm = 20335 },
118 { .temp_c = 40, .ohm = 16115 },
119 { .temp_c = 45, .ohm = 12849 },
120 { .temp_c = 50, .ohm = 10306 },
121 { .temp_c = 55, .ohm = 8314 },
122 { .temp_c = 60, .ohm = 6746 },
123 { .temp_c = 65, .ohm = 5503 },
124 { .temp_c = 70, .ohm = 4513 },
125 { .temp_c = 75, .ohm = 3721 },
126 { .temp_c = 80, .ohm = 3084 },
127 { .temp_c = 85, .ohm = 2569 },
128 { .temp_c = 90, .ohm = 2151 },
129 { .temp_c = 95, .ohm = 1809 },
130 { .temp_c = 100, .ohm = 1529 },
131 { .temp_c = 105, .ohm = 1299 },
132 { .temp_c = 110, .ohm = 1108 },
133 { .temp_c = 115, .ohm = 949 },
134 { .temp_c = 120, .ohm = 817 },
135 { .temp_c = 125, .ohm = 707 },
136};
137
138static const struct ntc_compensation ncpXXwf104[] = {
139 { .temp_c = -40, .ohm = 4397119 },
140 { .temp_c = -35, .ohm = 3088599 },
141 { .temp_c = -30, .ohm = 2197225 },
142 { .temp_c = -25, .ohm = 1581881 },
143 { .temp_c = -20, .ohm = 1151037 },
144 { .temp_c = -15, .ohm = 846579 },
145 { .temp_c = -10, .ohm = 628988 },
146 { .temp_c = -5, .ohm = 471632 },
147 { .temp_c = 0, .ohm = 357012 },
148 { .temp_c = 5, .ohm = 272500 },
149 { .temp_c = 10, .ohm = 209710 },
150 { .temp_c = 15, .ohm = 162651 },
151 { .temp_c = 20, .ohm = 127080 },
152 { .temp_c = 25, .ohm = 100000 },
153 { .temp_c = 30, .ohm = 79222 },
154 { .temp_c = 35, .ohm = 63167 },
155 { .temp_c = 40, .ohm = 50677 },
156 { .temp_c = 45, .ohm = 40904 },
157 { .temp_c = 50, .ohm = 33195 },
158 { .temp_c = 55, .ohm = 27091 },
159 { .temp_c = 60, .ohm = 22224 },
160 { .temp_c = 65, .ohm = 18323 },
161 { .temp_c = 70, .ohm = 15184 },
162 { .temp_c = 75, .ohm = 12635 },
163 { .temp_c = 80, .ohm = 10566 },
164 { .temp_c = 85, .ohm = 8873 },
165 { .temp_c = 90, .ohm = 7481 },
166 { .temp_c = 95, .ohm = 6337 },
167 { .temp_c = 100, .ohm = 5384 },
168 { .temp_c = 105, .ohm = 4594 },
169 { .temp_c = 110, .ohm = 3934 },
170 { .temp_c = 115, .ohm = 3380 },
171 { .temp_c = 120, .ohm = 2916 },
172 { .temp_c = 125, .ohm = 2522 },
173};
174
175static const struct ntc_compensation ncpXXxh103[] = {
176 { .temp_c = -40, .ohm = 247565 },
177 { .temp_c = -35, .ohm = 181742 },
178 { .temp_c = -30, .ohm = 135128 },
179 { .temp_c = -25, .ohm = 101678 },
180 { .temp_c = -20, .ohm = 77373 },
181 { .temp_c = -15, .ohm = 59504 },
182 { .temp_c = -10, .ohm = 46222 },
183 { .temp_c = -5, .ohm = 36244 },
184 { .temp_c = 0, .ohm = 28674 },
185 { .temp_c = 5, .ohm = 22878 },
186 { .temp_c = 10, .ohm = 18399 },
187 { .temp_c = 15, .ohm = 14910 },
188 { .temp_c = 20, .ohm = 12169 },
189 { .temp_c = 25, .ohm = 10000 },
190 { .temp_c = 30, .ohm = 8271 },
191 { .temp_c = 35, .ohm = 6883 },
192 { .temp_c = 40, .ohm = 5762 },
193 { .temp_c = 45, .ohm = 4851 },
194 { .temp_c = 50, .ohm = 4105 },
195 { .temp_c = 55, .ohm = 3492 },
196 { .temp_c = 60, .ohm = 2985 },
197 { .temp_c = 65, .ohm = 2563 },
198 { .temp_c = 70, .ohm = 2211 },
199 { .temp_c = 75, .ohm = 1915 },
200 { .temp_c = 80, .ohm = 1666 },
201 { .temp_c = 85, .ohm = 1454 },
202 { .temp_c = 90, .ohm = 1275 },
203 { .temp_c = 95, .ohm = 1121 },
204 { .temp_c = 100, .ohm = 990 },
205 { .temp_c = 105, .ohm = 876 },
206 { .temp_c = 110, .ohm = 779 },
207 { .temp_c = 115, .ohm = 694 },
208 { .temp_c = 120, .ohm = 620 },
209 { .temp_c = 125, .ohm = 556 },
210};
211
212
213
214
215
216static const struct ntc_compensation b57330v2103[] = {
217 { .temp_c = -40, .ohm = 190030 },
218 { .temp_c = -35, .ohm = 145360 },
219 { .temp_c = -30, .ohm = 112060 },
220 { .temp_c = -25, .ohm = 87041 },
221 { .temp_c = -20, .ohm = 68104 },
222 { .temp_c = -15, .ohm = 53665 },
223 { .temp_c = -10, .ohm = 42576 },
224 { .temp_c = -5, .ohm = 34001 },
225 { .temp_c = 0, .ohm = 27326 },
226 { .temp_c = 5, .ohm = 22096 },
227 { .temp_c = 10, .ohm = 17973 },
228 { .temp_c = 15, .ohm = 14703 },
229 { .temp_c = 20, .ohm = 12090 },
230 { .temp_c = 25, .ohm = 10000 },
231 { .temp_c = 30, .ohm = 8311 },
232 { .temp_c = 35, .ohm = 6941 },
233 { .temp_c = 40, .ohm = 5825 },
234 { .temp_c = 45, .ohm = 4911 },
235 { .temp_c = 50, .ohm = 4158 },
236 { .temp_c = 55, .ohm = 3536 },
237 { .temp_c = 60, .ohm = 3019 },
238 { .temp_c = 65, .ohm = 2588 },
239 { .temp_c = 70, .ohm = 2227 },
240 { .temp_c = 75, .ohm = 1924 },
241 { .temp_c = 80, .ohm = 1668 },
242 { .temp_c = 85, .ohm = 1451 },
243 { .temp_c = 90, .ohm = 1266 },
244 { .temp_c = 95, .ohm = 1108 },
245 { .temp_c = 100, .ohm = 973 },
246 { .temp_c = 105, .ohm = 857 },
247 { .temp_c = 110, .ohm = 757 },
248 { .temp_c = 115, .ohm = 671 },
249 { .temp_c = 120, .ohm = 596 },
250 { .temp_c = 125, .ohm = 531 },
251};
252
253static const struct ntc_compensation b57891s0103[] = {
254 { .temp_c = -55.0, .ohm = 878900 },
255 { .temp_c = -50.0, .ohm = 617590 },
256 { .temp_c = -45.0, .ohm = 439340 },
257 { .temp_c = -40.0, .ohm = 316180 },
258 { .temp_c = -35.0, .ohm = 230060 },
259 { .temp_c = -30.0, .ohm = 169150 },
260 { .temp_c = -25.0, .ohm = 125550 },
261 { .temp_c = -20.0, .ohm = 94143 },
262 { .temp_c = -15.0, .ohm = 71172 },
263 { .temp_c = -10.0, .ohm = 54308 },
264 { .temp_c = -5.0, .ohm = 41505 },
265 { .temp_c = 0.0, .ohm = 32014 },
266 { .temp_c = 5.0, .ohm = 25011 },
267 { .temp_c = 10.0, .ohm = 19691 },
268 { .temp_c = 15.0, .ohm = 15618 },
269 { .temp_c = 20.0, .ohm = 12474 },
270 { .temp_c = 25.0, .ohm = 10000 },
271 { .temp_c = 30.0, .ohm = 8080 },
272 { .temp_c = 35.0, .ohm = 6569 },
273 { .temp_c = 40.0, .ohm = 5372 },
274 { .temp_c = 45.0, .ohm = 4424 },
275 { .temp_c = 50.0, .ohm = 3661 },
276 { .temp_c = 55.0, .ohm = 3039 },
277 { .temp_c = 60.0, .ohm = 2536 },
278 { .temp_c = 65.0, .ohm = 2128 },
279 { .temp_c = 70.0, .ohm = 1794 },
280 { .temp_c = 75.0, .ohm = 1518 },
281 { .temp_c = 80.0, .ohm = 1290 },
282 { .temp_c = 85.0, .ohm = 1100 },
283 { .temp_c = 90.0, .ohm = 942 },
284 { .temp_c = 95.0, .ohm = 809 },
285 { .temp_c = 100.0, .ohm = 697 },
286 { .temp_c = 105.0, .ohm = 604 },
287 { .temp_c = 110.0, .ohm = 525 },
288 { .temp_c = 115.0, .ohm = 457 },
289 { .temp_c = 120.0, .ohm = 400 },
290 { .temp_c = 125.0, .ohm = 351 },
291 { .temp_c = 130.0, .ohm = 308 },
292 { .temp_c = 135.0, .ohm = 272 },
293 { .temp_c = 140.0, .ohm = 240 },
294 { .temp_c = 145.0, .ohm = 213 },
295 { .temp_c = 150.0, .ohm = 189 },
296 { .temp_c = 155.0, .ohm = 168 },
297};
298
299struct ntc_type {
300 const struct ntc_compensation *comp;
301 int n_comp;
302};
303
304#define NTC_TYPE(ntc, compensation) \
305[(ntc)] = { .comp = (compensation), .n_comp = ARRAY_SIZE(compensation) }
306
307static const struct ntc_type ntc_type[] = {
308 NTC_TYPE(TYPE_B57330V2103, b57330v2103),
309 NTC_TYPE(TYPE_B57891S0103, b57891s0103),
310 NTC_TYPE(TYPE_NCPXXWB473, ncpXXwb473),
311 NTC_TYPE(TYPE_NCPXXWF104, ncpXXwf104),
312 NTC_TYPE(TYPE_NCPXXWL333, ncpXXwl333),
313 NTC_TYPE(TYPE_NCPXXXH103, ncpXXxh103),
314};
315
316struct ntc_data {
317 struct ntc_thermistor_platform_data *pdata;
318 const struct ntc_compensation *comp;
319 int n_comp;
320};
321
322#if defined(CONFIG_OF) && IS_ENABLED(CONFIG_IIO)
323static int ntc_adc_iio_read(struct ntc_thermistor_platform_data *pdata)
324{
325 struct iio_channel *channel = pdata->chan;
326 int uv, ret;
327
328 ret = iio_read_channel_processed_scale(channel, &uv, 1000);
329 if (ret < 0) {
330 int raw;
331
332
333
334
335
336
337 ret = iio_read_channel_raw(channel, &raw);
338 if (ret < 0) {
339 pr_err("read channel() error: %d\n", ret);
340 return ret;
341 }
342 ret = iio_convert_raw_to_processed(channel, raw, &uv, 1000);
343 if (ret < 0) {
344
345 uv = (pdata->pullup_uv * (s64)raw) >> 12;
346 }
347 }
348
349 return uv;
350}
351
352static const struct of_device_id ntc_match[] = {
353 { .compatible = "epcos,b57330v2103",
354 .data = &ntc_thermistor_id[NTC_B57330V2103]},
355 { .compatible = "epcos,b57891s0103",
356 .data = &ntc_thermistor_id[NTC_B57891S0103] },
357 { .compatible = "murata,ncp03wb473",
358 .data = &ntc_thermistor_id[NTC_NCP03WB473] },
359 { .compatible = "murata,ncp03wf104",
360 .data = &ntc_thermistor_id[NTC_NCP03WF104] },
361 { .compatible = "murata,ncp15wb473",
362 .data = &ntc_thermistor_id[NTC_NCP15WB473] },
363 { .compatible = "murata,ncp15wl333",
364 .data = &ntc_thermistor_id[NTC_NCP15WL333] },
365 { .compatible = "murata,ncp15xh103",
366 .data = &ntc_thermistor_id[NTC_NCP15XH103] },
367 { .compatible = "murata,ncp18wb473",
368 .data = &ntc_thermistor_id[NTC_NCP18WB473] },
369 { .compatible = "murata,ncp21wb473",
370 .data = &ntc_thermistor_id[NTC_NCP21WB473] },
371
372
373 { .compatible = "ntc,ncp03wb473",
374 .data = &ntc_thermistor_id[NTC_NCP03WB473] },
375 { .compatible = "ntc,ncp15wb473",
376 .data = &ntc_thermistor_id[NTC_NCP15WB473] },
377 { .compatible = "ntc,ncp15wl333",
378 .data = &ntc_thermistor_id[NTC_NCP15WL333] },
379 { .compatible = "ntc,ncp18wb473",
380 .data = &ntc_thermistor_id[NTC_NCP18WB473] },
381 { .compatible = "ntc,ncp21wb473",
382 .data = &ntc_thermistor_id[NTC_NCP21WB473] },
383 { },
384};
385MODULE_DEVICE_TABLE(of, ntc_match);
386
387static struct ntc_thermistor_platform_data *
388ntc_thermistor_parse_dt(struct device *dev)
389{
390 struct iio_channel *chan;
391 enum iio_chan_type type;
392 struct device_node *np = dev->of_node;
393 struct ntc_thermistor_platform_data *pdata;
394 int ret;
395
396 if (!np)
397 return NULL;
398
399 pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
400 if (!pdata)
401 return ERR_PTR(-ENOMEM);
402
403 chan = devm_iio_channel_get(dev, NULL);
404 if (IS_ERR(chan))
405 return ERR_CAST(chan);
406
407 ret = iio_get_channel_type(chan, &type);
408 if (ret < 0)
409 return ERR_PTR(ret);
410
411 if (type != IIO_VOLTAGE)
412 return ERR_PTR(-EINVAL);
413
414 if (of_property_read_u32(np, "pullup-uv", &pdata->pullup_uv))
415 return ERR_PTR(-ENODEV);
416 if (of_property_read_u32(np, "pullup-ohm", &pdata->pullup_ohm))
417 return ERR_PTR(-ENODEV);
418 if (of_property_read_u32(np, "pulldown-ohm", &pdata->pulldown_ohm))
419 return ERR_PTR(-ENODEV);
420
421 if (of_find_property(np, "connected-positive", NULL))
422 pdata->connect = NTC_CONNECTED_POSITIVE;
423 else
424 pdata->connect = NTC_CONNECTED_GROUND;
425
426 pdata->chan = chan;
427 pdata->read_uv = ntc_adc_iio_read;
428
429 return pdata;
430}
431#else
432static struct ntc_thermistor_platform_data *
433ntc_thermistor_parse_dt(struct device *dev)
434{
435 return NULL;
436}
437
438#define ntc_match NULL
439
440#endif
441
442static inline u64 div64_u64_safe(u64 dividend, u64 divisor)
443{
444 if (divisor == 0 && dividend == 0)
445 return 0;
446 if (divisor == 0)
447 return UINT_MAX;
448 return div64_u64(dividend, divisor);
449}
450
451static int get_ohm_of_thermistor(struct ntc_data *data, unsigned int uv)
452{
453 struct ntc_thermistor_platform_data *pdata = data->pdata;
454 u32 puv = pdata->pullup_uv;
455 u64 n, puo, pdo;
456 puo = pdata->pullup_ohm;
457 pdo = pdata->pulldown_ohm;
458
459 if (uv == 0)
460 return (pdata->connect == NTC_CONNECTED_POSITIVE) ?
461 INT_MAX : 0;
462 if (uv >= puv)
463 return (pdata->connect == NTC_CONNECTED_POSITIVE) ?
464 0 : INT_MAX;
465
466 if (pdata->connect == NTC_CONNECTED_POSITIVE && puo == 0)
467 n = div_u64(pdo * (puv - uv), uv);
468 else if (pdata->connect == NTC_CONNECTED_GROUND && pdo == 0)
469 n = div_u64(puo * uv, puv - uv);
470 else if (pdata->connect == NTC_CONNECTED_POSITIVE)
471 n = div64_u64_safe(pdo * puo * (puv - uv),
472 puo * uv - pdo * (puv - uv));
473 else
474 n = div64_u64_safe(pdo * puo * uv, pdo * (puv - uv) - puo * uv);
475
476 if (n > INT_MAX)
477 n = INT_MAX;
478 return n;
479}
480
481static void lookup_comp(struct ntc_data *data, unsigned int ohm,
482 int *i_low, int *i_high)
483{
484 int start, end, mid;
485
486
487
488
489
490
491
492
493 if (ohm >= data->comp[0].ohm) {
494 *i_low = 0;
495 *i_high = 0;
496 return;
497 }
498 if (ohm <= data->comp[data->n_comp - 1].ohm) {
499 *i_low = data->n_comp - 1;
500 *i_high = data->n_comp - 1;
501 return;
502 }
503
504
505 start = 0;
506 end = data->n_comp;
507 while (start < end) {
508 mid = start + (end - start) / 2;
509
510
511
512
513
514
515
516
517
518 if (ohm >= data->comp[mid].ohm) {
519 end = mid;
520 } else {
521 start = mid + 1;
522
523
524
525
526
527
528 if (ohm >= data->comp[start].ohm)
529 end = start;
530 }
531
532
533
534
535 }
536
537
538
539
540 *i_low = end;
541 if (ohm == data->comp[end].ohm)
542 *i_high = end;
543 else
544 *i_high = end - 1;
545}
546
547static int get_temp_mc(struct ntc_data *data, unsigned int ohm)
548{
549 int low, high;
550 int temp;
551
552 lookup_comp(data, ohm, &low, &high);
553
554
555
556
557
558 temp = fixp_linear_interpolate(data->comp[low].ohm,
559 data->comp[low].temp_c * 1000,
560 data->comp[high].ohm,
561 data->comp[high].temp_c * 1000,
562 ohm);
563 return temp;
564}
565
566static int ntc_thermistor_get_ohm(struct ntc_data *data)
567{
568 int read_uv;
569
570 if (data->pdata->read_ohm)
571 return data->pdata->read_ohm();
572
573 if (data->pdata->read_uv) {
574 read_uv = data->pdata->read_uv(data->pdata);
575 if (read_uv < 0)
576 return read_uv;
577 return get_ohm_of_thermistor(data, read_uv);
578 }
579 return -EINVAL;
580}
581
582static int ntc_read(struct device *dev, enum hwmon_sensor_types type,
583 u32 attr, int channel, long *val)
584{
585 struct ntc_data *data = dev_get_drvdata(dev);
586 int ohm;
587
588 switch (type) {
589 case hwmon_temp:
590 switch (attr) {
591 case hwmon_temp_input:
592 ohm = ntc_thermistor_get_ohm(data);
593 if (ohm < 0)
594 return ohm;
595 *val = get_temp_mc(data, ohm);
596 return 0;
597 case hwmon_temp_type:
598 *val = 4;
599 return 0;
600 default:
601 break;
602 }
603 break;
604 default:
605 break;
606 }
607 return -EINVAL;
608}
609
610static umode_t ntc_is_visible(const void *data, enum hwmon_sensor_types type,
611 u32 attr, int channel)
612{
613 if (type == hwmon_temp) {
614 switch (attr) {
615 case hwmon_temp_input:
616 case hwmon_temp_type:
617 return 0444;
618 default:
619 break;
620 }
621 }
622 return 0;
623}
624
625static const struct hwmon_channel_info *ntc_info[] = {
626 HWMON_CHANNEL_INFO(chip, HWMON_C_REGISTER_TZ),
627 HWMON_CHANNEL_INFO(temp, HWMON_T_INPUT | HWMON_T_TYPE),
628 NULL
629};
630
631static const struct hwmon_ops ntc_hwmon_ops = {
632 .is_visible = ntc_is_visible,
633 .read = ntc_read,
634};
635
636static const struct hwmon_chip_info ntc_chip_info = {
637 .ops = &ntc_hwmon_ops,
638 .info = ntc_info,
639};
640
641static int ntc_thermistor_probe(struct platform_device *pdev)
642{
643 struct device *dev = &pdev->dev;
644 const struct of_device_id *of_id =
645 of_match_device(of_match_ptr(ntc_match), dev);
646 const struct platform_device_id *pdev_id;
647 struct ntc_thermistor_platform_data *pdata;
648 struct device *hwmon_dev;
649 struct ntc_data *data;
650
651 pdata = ntc_thermistor_parse_dt(dev);
652 if (IS_ERR(pdata))
653 return PTR_ERR(pdata);
654 else if (pdata == NULL)
655 pdata = dev_get_platdata(dev);
656
657 if (!pdata) {
658 dev_err(dev, "No platform init data supplied.\n");
659 return -ENODEV;
660 }
661
662
663 if (!pdata->read_uv && !pdata->read_ohm) {
664 dev_err(dev,
665 "Both read_uv and read_ohm missing. Need either one of the two.\n");
666 return -EINVAL;
667 }
668
669 if (pdata->read_uv && pdata->read_ohm) {
670 dev_warn(dev,
671 "Only one of read_uv and read_ohm is needed; ignoring read_uv.\n");
672 pdata->read_uv = NULL;
673 }
674
675 if (pdata->read_uv && (pdata->pullup_uv == 0 ||
676 (pdata->pullup_ohm == 0 && pdata->connect ==
677 NTC_CONNECTED_GROUND) ||
678 (pdata->pulldown_ohm == 0 && pdata->connect ==
679 NTC_CONNECTED_POSITIVE) ||
680 (pdata->connect != NTC_CONNECTED_POSITIVE &&
681 pdata->connect != NTC_CONNECTED_GROUND))) {
682 dev_err(dev, "Required data to use read_uv not supplied.\n");
683 return -EINVAL;
684 }
685
686 data = devm_kzalloc(dev, sizeof(struct ntc_data), GFP_KERNEL);
687 if (!data)
688 return -ENOMEM;
689
690 pdev_id = of_id ? of_id->data : platform_get_device_id(pdev);
691
692 data->pdata = pdata;
693
694 if (pdev_id->driver_data >= ARRAY_SIZE(ntc_type)) {
695 dev_err(dev, "Unknown device type: %lu(%s)\n",
696 pdev_id->driver_data, pdev_id->name);
697 return -EINVAL;
698 }
699
700 data->comp = ntc_type[pdev_id->driver_data].comp;
701 data->n_comp = ntc_type[pdev_id->driver_data].n_comp;
702
703 hwmon_dev = devm_hwmon_device_register_with_info(dev, pdev_id->name,
704 data, &ntc_chip_info,
705 NULL);
706 if (IS_ERR(hwmon_dev)) {
707 dev_err(dev, "unable to register as hwmon device.\n");
708 return PTR_ERR(hwmon_dev);
709 }
710
711 dev_info(dev, "Thermistor type: %s successfully probed.\n",
712 pdev_id->name);
713
714 return 0;
715}
716
717static struct platform_driver ntc_thermistor_driver = {
718 .driver = {
719 .name = "ntc-thermistor",
720 .of_match_table = of_match_ptr(ntc_match),
721 },
722 .probe = ntc_thermistor_probe,
723 .id_table = ntc_thermistor_id,
724};
725
726module_platform_driver(ntc_thermistor_driver);
727
728MODULE_DESCRIPTION("NTC Thermistor Driver");
729MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
730MODULE_LICENSE("GPL");
731MODULE_ALIAS("platform:ntc-thermistor");
732
