Restartable sequences: self-tests
[deliverable/linux.git] / drivers / hwmon / ntc_thermistor.c
CommitLineData
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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 },
54ce3a0d 57 { "ncp15xh103", TYPE_NCPXXXH103 },
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58 { },
59};
60
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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 */
4626dcff 67static const struct ntc_compensation ncpXXwb473[] = {
088ce2ac
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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 },
f22aaaa7 102};
4626dcff 103static const struct ntc_compensation ncpXXwl333[] = {
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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 },
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138};
139
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140static 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
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177static 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
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214/*
215 * The following compensation table is from the specification of EPCOS NTC
216 * Thermistors Datasheet
217 */
218static 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
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255struct 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};
263
59cf4243 264#if defined(CONFIG_OF) && IS_ENABLED(CONFIG_IIO)
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265static int ntc_adc_iio_read(struct ntc_thermistor_platform_data *pdata)
266{
267 struct iio_channel *channel = pdata->chan;
0315253b 268 int raw, uv, ret;
9e8269de 269
0315253b 270 ret = iio_read_channel_raw(channel, &raw);
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271 if (ret < 0) {
272 pr_err("read channel() error: %d\n", ret);
273 return ret;
274 }
275
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276 ret = iio_convert_raw_to_processed(channel, raw, &uv, 1000);
277 if (ret < 0) {
278 /* Assume 12 bit ADC with vref at pullup_uv */
279 uv = (pdata->pullup_uv * (s64)raw) >> 12;
280 }
9e8269de 281
0315253b 282 return uv;
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283}
284
285static const struct of_device_id ntc_match[] = {
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286 { .compatible = "murata,ncp15wb473",
287 .data = &ntc_thermistor_id[0] },
288 { .compatible = "murata,ncp18wb473",
289 .data = &ntc_thermistor_id[1] },
290 { .compatible = "murata,ncp21wb473",
291 .data = &ntc_thermistor_id[2] },
292 { .compatible = "murata,ncp03wb473",
293 .data = &ntc_thermistor_id[3] },
294 { .compatible = "murata,ncp15wl333",
295 .data = &ntc_thermistor_id[4] },
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296 { .compatible = "epcos,b57330v2103",
297 .data = &ntc_thermistor_id[5]},
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298 { .compatible = "murata,ncp03wf104",
299 .data = &ntc_thermistor_id[6] },
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300 { .compatible = "murata,ncp15xh103",
301 .data = &ntc_thermistor_id[7] },
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302
303 /* Usage of vendor name "ntc" is deprecated */
9e8269de 304 { .compatible = "ntc,ncp15wb473",
ead82d67 305 .data = &ntc_thermistor_id[0] },
9e8269de 306 { .compatible = "ntc,ncp18wb473",
ead82d67 307 .data = &ntc_thermistor_id[1] },
9e8269de 308 { .compatible = "ntc,ncp21wb473",
ead82d67 309 .data = &ntc_thermistor_id[2] },
9e8269de 310 { .compatible = "ntc,ncp03wb473",
ead82d67 311 .data = &ntc_thermistor_id[3] },
9e8269de 312 { .compatible = "ntc,ncp15wl333",
ead82d67 313 .data = &ntc_thermistor_id[4] },
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314 { },
315};
316MODULE_DEVICE_TABLE(of, ntc_match);
317
318static struct ntc_thermistor_platform_data *
319ntc_thermistor_parse_dt(struct platform_device *pdev)
320{
321 struct iio_channel *chan;
adba6575 322 enum iio_chan_type type;
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323 struct device_node *np = pdev->dev.of_node;
324 struct ntc_thermistor_platform_data *pdata;
adba6575 325 int ret;
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326
327 if (!np)
328 return NULL;
329
330 pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
331 if (!pdata)
332 return ERR_PTR(-ENOMEM);
333
334 chan = iio_channel_get(&pdev->dev, NULL);
335 if (IS_ERR(chan))
336 return ERR_CAST(chan);
337
adba6575
CL
338 ret = iio_get_channel_type(chan, &type);
339 if (ret < 0)
340 return ERR_PTR(ret);
341
342 if (type != IIO_VOLTAGE)
343 return ERR_PTR(-EINVAL);
344
088ce2ac 345 if (of_property_read_u32(np, "pullup-uv", &pdata->pullup_uv))
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346 return ERR_PTR(-ENODEV);
347 if (of_property_read_u32(np, "pullup-ohm", &pdata->pullup_ohm))
348 return ERR_PTR(-ENODEV);
349 if (of_property_read_u32(np, "pulldown-ohm", &pdata->pulldown_ohm))
350 return ERR_PTR(-ENODEV);
351
352 if (of_find_property(np, "connected-positive", NULL))
353 pdata->connect = NTC_CONNECTED_POSITIVE;
354 else /* status change should be possible if not always on. */
355 pdata->connect = NTC_CONNECTED_GROUND;
356
357 pdata->chan = chan;
088ce2ac 358 pdata->read_uv = ntc_adc_iio_read;
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359
360 return pdata;
361}
362static void ntc_iio_channel_release(struct ntc_thermistor_platform_data *pdata)
363{
364 if (pdata->chan)
365 iio_channel_release(pdata->chan);
366}
367#else
368static struct ntc_thermistor_platform_data *
369ntc_thermistor_parse_dt(struct platform_device *pdev)
370{
371 return NULL;
372}
373
59cf4243
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374#define ntc_match NULL
375
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376static void ntc_iio_channel_release(struct ntc_thermistor_platform_data *pdata)
377{ }
378#endif
379
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380static inline u64 div64_u64_safe(u64 dividend, u64 divisor)
381{
382 if (divisor == 0 && dividend == 0)
383 return 0;
384 if (divisor == 0)
385 return UINT_MAX;
386 return div64_u64(dividend, divisor);
387}
388
088ce2ac 389static int get_ohm_of_thermistor(struct ntc_data *data, unsigned int uv)
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390{
391 struct ntc_thermistor_platform_data *pdata = data->pdata;
f6725ae2 392 u32 puv = pdata->pullup_uv;
088ce2ac
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393 u64 n, puo, pdo;
394 puo = pdata->pullup_ohm;
395 pdo = pdata->pulldown_ohm;
f22aaaa7 396
f6725ae2
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397 if (uv == 0)
398 return (pdata->connect == NTC_CONNECTED_POSITIVE) ?
399 INT_MAX : 0;
400 if (uv >= puv)
f22aaaa7 401 return (pdata->connect == NTC_CONNECTED_POSITIVE) ?
dbe43a62 402 0 : INT_MAX;
f22aaaa7 403
088ce2ac 404 if (pdata->connect == NTC_CONNECTED_POSITIVE && puo == 0)
f6725ae2 405 n = div_u64(pdo * (puv - uv), uv);
088ce2ac 406 else if (pdata->connect == NTC_CONNECTED_GROUND && pdo == 0)
f6725ae2 407 n = div_u64(puo * uv, puv - uv);
f22aaaa7 408 else if (pdata->connect == NTC_CONNECTED_POSITIVE)
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CL
409 n = div64_u64_safe(pdo * puo * (puv - uv),
410 puo * uv - pdo * (puv - uv));
f22aaaa7 411 else
f6725ae2 412 n = div64_u64_safe(pdo * puo * uv, pdo * (puv - uv) - puo * uv);
f22aaaa7 413
088ce2ac
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414 if (n > INT_MAX)
415 n = INT_MAX;
416 return n;
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417}
418
dbe43a62
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419static void lookup_comp(struct ntc_data *data, unsigned int ohm,
420 int *i_low, int *i_high)
f22aaaa7 421{
dbe43a62
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422 int start, end, mid;
423
424 /*
425 * Handle special cases: Resistance is higher than or equal to
426 * resistance in first table entry, or resistance is lower or equal
427 * to resistance in last table entry.
428 * In these cases, return i_low == i_high, either pointing to the
429 * beginning or to the end of the table depending on the condition.
430 */
431 if (ohm >= data->comp[0].ohm) {
432 *i_low = 0;
433 *i_high = 0;
434 return;
435 }
436 if (ohm <= data->comp[data->n_comp - 1].ohm) {
437 *i_low = data->n_comp - 1;
438 *i_high = data->n_comp - 1;
439 return;
440 }
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441
442 /* Do a binary search on compensation table */
443 start = 0;
444 end = data->n_comp;
dbe43a62 445 while (start < end) {
f22aaaa7 446 mid = start + (end - start) / 2;
dbe43a62
GR
447 /*
448 * start <= mid < end
449 * data->comp[start].ohm > ohm >= data->comp[end].ohm
450 *
451 * We could check for "ohm == data->comp[mid].ohm" here, but
452 * that is a quite unlikely condition, and we would have to
453 * check again after updating start. Check it at the end instead
454 * for simplicity.
455 */
456 if (ohm >= data->comp[mid].ohm) {
f22aaaa7 457 end = mid;
f22aaaa7 458 } else {
dbe43a62
GR
459 start = mid + 1;
460 /*
461 * ohm >= data->comp[start].ohm might be true here,
462 * since we set start to mid + 1. In that case, we are
463 * done. We could keep going, but the condition is quite
464 * likely to occur, so it is worth checking for it.
465 */
466 if (ohm >= data->comp[start].ohm)
467 end = start;
f22aaaa7 468 }
dbe43a62
GR
469 /*
470 * start <= end
471 * data->comp[start].ohm >= ohm >= data->comp[end].ohm
472 */
f22aaaa7 473 }
dbe43a62
GR
474 /*
475 * start == end
476 * ohm >= data->comp[end].ohm
477 */
478 *i_low = end;
479 if (ohm == data->comp[end].ohm)
480 *i_high = end;
481 else
482 *i_high = end - 1;
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483}
484
088ce2ac 485static int get_temp_mc(struct ntc_data *data, unsigned int ohm)
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486{
487 int low, high;
dbe43a62 488 int temp;
f22aaaa7 489
dbe43a62
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490 lookup_comp(data, ohm, &low, &high);
491 if (low == high) {
f22aaaa7 492 /* Unable to use linear approximation */
088ce2ac 493 temp = data->comp[low].temp_c * 1000;
f22aaaa7 494 } else {
088ce2ac
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495 temp = data->comp[low].temp_c * 1000 +
496 ((data->comp[high].temp_c - data->comp[low].temp_c) *
f22aaaa7
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497 1000 * ((int)ohm - (int)data->comp[low].ohm)) /
498 ((int)data->comp[high].ohm - (int)data->comp[low].ohm);
499 }
dbe43a62 500 return temp;
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501}
502
dbe43a62 503static int ntc_thermistor_get_ohm(struct ntc_data *data)
f22aaaa7 504{
088ce2ac 505 int read_uv;
f22aaaa7 506
dbe43a62
GR
507 if (data->pdata->read_ohm)
508 return data->pdata->read_ohm();
f22aaaa7 509
088ce2ac
GR
510 if (data->pdata->read_uv) {
511 read_uv = data->pdata->read_uv(data->pdata);
512 if (read_uv < 0)
513 return read_uv;
514 return get_ohm_of_thermistor(data, read_uv);
f22aaaa7 515 }
dbe43a62 516 return -EINVAL;
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517}
518
17e8351a 519static int ntc_read_temp(void *dev, int *temp)
c08860ff
JL
520{
521 struct ntc_data *data = dev_get_drvdata(dev);
522 int ohm;
523
524 ohm = ntc_thermistor_get_ohm(data);
525 if (ohm < 0)
526 return ohm;
527
528 *temp = get_temp_mc(data, ohm);
529
530 return 0;
531}
532
f22aaaa7
DK
533static ssize_t ntc_show_name(struct device *dev,
534 struct device_attribute *attr, char *buf)
535{
536 struct ntc_data *data = dev_get_drvdata(dev);
537
538 return sprintf(buf, "%s\n", data->name);
539}
540
541static ssize_t ntc_show_type(struct device *dev,
542 struct device_attribute *attr, char *buf)
543{
544 return sprintf(buf, "4\n");
545}
546
547static ssize_t ntc_show_temp(struct device *dev,
548 struct device_attribute *attr, char *buf)
549{
550 struct ntc_data *data = dev_get_drvdata(dev);
dbe43a62
GR
551 int ohm;
552
553 ohm = ntc_thermistor_get_ohm(data);
554 if (ohm < 0)
555 return ohm;
f22aaaa7 556
088ce2ac 557 return sprintf(buf, "%d\n", get_temp_mc(data, ohm));
f22aaaa7
DK
558}
559
560static SENSOR_DEVICE_ATTR(temp1_type, S_IRUGO, ntc_show_type, NULL, 0);
561static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, ntc_show_temp, NULL, 0);
562static DEVICE_ATTR(name, S_IRUGO, ntc_show_name, NULL);
563
564static struct attribute *ntc_attributes[] = {
565 &dev_attr_name.attr,
566 &sensor_dev_attr_temp1_type.dev_attr.attr,
567 &sensor_dev_attr_temp1_input.dev_attr.attr,
568 NULL,
569};
570
571static const struct attribute_group ntc_attr_group = {
572 .attrs = ntc_attributes,
573};
574
2251aef6
EV
575static const struct thermal_zone_of_device_ops ntc_of_thermal_ops = {
576 .get_temp = ntc_read_temp,
577};
578
6c931ae1 579static int ntc_thermistor_probe(struct platform_device *pdev)
f22aaaa7 580{
0e058bc3 581 struct thermal_zone_device *tz;
9e8269de
NKC
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;
f22aaaa7 586 struct ntc_data *data;
9e8269de
NKC
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)
a8b3a3a5 593 pdata = dev_get_platdata(&pdev->dev);
f22aaaa7
DK
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. */
088ce2ac 601 if (!pdata->read_uv && !pdata->read_ohm) {
a7871def 602 dev_err(&pdev->dev,
088ce2ac 603 "Both read_uv and read_ohm missing. Need either one of the two.\n");
f22aaaa7
DK
604 return -EINVAL;
605 }
606
088ce2ac 607 if (pdata->read_uv && pdata->read_ohm) {
a7871def 608 dev_warn(&pdev->dev,
088ce2ac
GR
609 "Only one of read_uv and read_ohm is needed; ignoring read_uv.\n");
610 pdata->read_uv = NULL;
f22aaaa7
DK
611 }
612
088ce2ac 613 if (pdata->read_uv && (pdata->pullup_uv == 0 ||
f22aaaa7
DK
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))) {
a7871def 620 dev_err(&pdev->dev,
088ce2ac 621 "Required data to use read_uv not supplied.\n");
f22aaaa7
DK
622 return -EINVAL;
623 }
624
41141e64 625 data = devm_kzalloc(&pdev->dev, sizeof(struct ntc_data), GFP_KERNEL);
f22aaaa7
DK
626 if (!data)
627 return -ENOMEM;
628
9e8269de
NKC
629 pdev_id = of_id ? of_id->data : platform_get_device_id(pdev);
630
f22aaaa7
DK
631 data->dev = &pdev->dev;
632 data->pdata = pdata;
9e8269de 633 strlcpy(data->name, pdev_id->name, sizeof(data->name));
f22aaaa7 634
9e8269de 635 switch (pdev_id->driver_data) {
f22aaaa7
DK
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;
ed67f087
JP
644 case TYPE_B57330V2103:
645 data->comp = b57330v2103;
646 data->n_comp = ARRAY_SIZE(b57330v2103);
647 break;
887ee434
BS
648 case TYPE_NCPXXWF104:
649 data->comp = ncpXXwf104;
650 data->n_comp = ARRAY_SIZE(ncpXXwf104);
651 break;
54ce3a0d
JM
652 case TYPE_NCPXXXH103:
653 data->comp = ncpXXxh103;
654 data->n_comp = ARRAY_SIZE(ncpXXxh103);
655 break;
f22aaaa7
DK
656 default:
657 dev_err(&pdev->dev, "Unknown device type: %lu(%s)\n",
9e8269de 658 pdev_id->driver_data, pdev_id->name);
41141e64 659 return -EINVAL;
f22aaaa7
DK
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");
41141e64 667 return ret;
f22aaaa7
DK
668 }
669
670 data->hwmon_dev = hwmon_device_register(data->dev);
425d2476 671 if (IS_ERR(data->hwmon_dev)) {
f22aaaa7 672 dev_err(data->dev, "unable to register as hwmon device.\n");
425d2476 673 ret = PTR_ERR(data->hwmon_dev);
f22aaaa7
DK
674 goto err_after_sysfs;
675 }
676
9e8269de 677 dev_info(&pdev->dev, "Thermistor type: %s successfully probed.\n",
93a88ef3 678 pdev_id->name);
9e8269de 679
0e058bc3
EV
680 tz = devm_thermal_zone_of_sensor_register(data->dev, 0, data->dev,
681 &ntc_of_thermal_ops);
682 if (IS_ERR(tz))
c08860ff 683 dev_dbg(&pdev->dev, "Failed to register to thermal fw.\n");
c08860ff 684
f22aaaa7
DK
685 return 0;
686err_after_sysfs:
687 sysfs_remove_group(&data->dev->kobj, &ntc_attr_group);
9e8269de 688 ntc_iio_channel_release(pdata);
f22aaaa7
DK
689 return ret;
690}
691
281dfd0b 692static int ntc_thermistor_remove(struct platform_device *pdev)
f22aaaa7
DK
693{
694 struct ntc_data *data = platform_get_drvdata(pdev);
9e8269de 695 struct ntc_thermistor_platform_data *pdata = data->pdata;
f22aaaa7
DK
696
697 hwmon_device_unregister(data->hwmon_dev);
698 sysfs_remove_group(&data->dev->kobj, &ntc_attr_group);
9e8269de 699 ntc_iio_channel_release(pdata);
f22aaaa7 700
f22aaaa7
DK
701 return 0;
702}
703
f22aaaa7
DK
704static struct platform_driver ntc_thermistor_driver = {
705 .driver = {
706 .name = "ntc-thermistor",
9e8269de 707 .of_match_table = of_match_ptr(ntc_match),
f22aaaa7
DK
708 },
709 .probe = ntc_thermistor_probe,
9e5e9b7a 710 .remove = ntc_thermistor_remove,
f22aaaa7
DK
711 .id_table = ntc_thermistor_id,
712};
713
25a236a5 714module_platform_driver(ntc_thermistor_driver);
f22aaaa7 715
ed67f087 716MODULE_DESCRIPTION("NTC Thermistor Driver");
f22aaaa7
DK
717MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
718MODULE_LICENSE("GPL");
719MODULE_ALIAS("platform:ntc-thermistor");
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