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f22aaaa7 DK |
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> | |
9e8269de NKC |
29 | #include <linux/of.h> |
30 | #include <linux/of_device.h> | |
f22aaaa7 DK |
31 | |
32 | #include <linux/platform_data/ntc_thermistor.h> | |
33 | ||
9e8269de NKC |
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 | ||
f22aaaa7 DK |
39 | #include <linux/hwmon.h> |
40 | #include <linux/hwmon-sysfs.h> | |
c08860ff | 41 | #include <linux/thermal.h> |
f22aaaa7 DK |
42 | |
43 | struct ntc_compensation { | |
088ce2ac | 44 | int temp_c; |
f22aaaa7 DK |
45 | unsigned int ohm; |
46 | }; | |
47 | ||
ead82d67 | 48 | /* Order matters, ntc_match references the entries by index */ |
9e8269de NKC |
49 | static const struct platform_device_id ntc_thermistor_id[] = { |
50 | { "ncp15wb473", TYPE_NCPXXWB473 }, | |
51 | { "ncp18wb473", TYPE_NCPXXWB473 }, | |
52 | { "ncp21wb473", TYPE_NCPXXWB473 }, | |
53 | { "ncp03wb473", TYPE_NCPXXWB473 }, | |
54 | { "ncp15wl333", TYPE_NCPXXWL333 }, | |
ed67f087 | 55 | { "b57330v2103", TYPE_B57330V2103}, |
887ee434 | 56 | { "ncp03wf104", TYPE_NCPXXWF104 }, |
54ce3a0d | 57 | { "ncp15xh103", TYPE_NCPXXXH103 }, |
9e8269de NKC |
58 | { }, |
59 | }; | |
60 | ||
f22aaaa7 DK |
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 | 67 | static const struct ntc_compensation ncpXXwb473[] = { |
088ce2ac GR |
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 | 103 | static const struct ntc_compensation ncpXXwl333[] = { |
088ce2ac GR |
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 }, | |
f22aaaa7 DK |
138 | }; |
139 | ||
887ee434 BS |
140 | static const struct ntc_compensation ncpXXwf104[] = { |
141 | { .temp_c = -40, .ohm = 4397119 }, | |
142 | { .temp_c = -35, .ohm = 3088599 }, | |
143 | { .temp_c = -30, .ohm = 2197225 }, | |
144 | { .temp_c = -25, .ohm = 1581881 }, | |
145 | { .temp_c = -20, .ohm = 1151037 }, | |
146 | { .temp_c = -15, .ohm = 846579 }, | |
147 | { .temp_c = -10, .ohm = 628988 }, | |
148 | { .temp_c = -5, .ohm = 471632 }, | |
149 | { .temp_c = 0, .ohm = 357012 }, | |
150 | { .temp_c = 5, .ohm = 272500 }, | |
151 | { .temp_c = 10, .ohm = 209710 }, | |
152 | { .temp_c = 15, .ohm = 162651 }, | |
153 | { .temp_c = 20, .ohm = 127080 }, | |
154 | { .temp_c = 25, .ohm = 100000 }, | |
155 | { .temp_c = 30, .ohm = 79222 }, | |
156 | { .temp_c = 35, .ohm = 63167 }, | |
157 | { .temp_c = 40, .ohm = 50677 }, | |
158 | { .temp_c = 45, .ohm = 40904 }, | |
159 | { .temp_c = 50, .ohm = 33195 }, | |
160 | { .temp_c = 55, .ohm = 27091 }, | |
161 | { .temp_c = 60, .ohm = 22224 }, | |
162 | { .temp_c = 65, .ohm = 18323 }, | |
163 | { .temp_c = 70, .ohm = 15184 }, | |
164 | { .temp_c = 75, .ohm = 12635 }, | |
165 | { .temp_c = 80, .ohm = 10566 }, | |
166 | { .temp_c = 85, .ohm = 8873 }, | |
167 | { .temp_c = 90, .ohm = 7481 }, | |
168 | { .temp_c = 95, .ohm = 6337 }, | |
169 | { .temp_c = 100, .ohm = 5384 }, | |
170 | { .temp_c = 105, .ohm = 4594 }, | |
171 | { .temp_c = 110, .ohm = 3934 }, | |
172 | { .temp_c = 115, .ohm = 3380 }, | |
173 | { .temp_c = 120, .ohm = 2916 }, | |
174 | { .temp_c = 125, .ohm = 2522 }, | |
175 | }; | |
176 | ||
54ce3a0d JM |
177 | static const struct ntc_compensation ncpXXxh103[] = { |
178 | { .temp_c = -40, .ohm = 247565 }, | |
179 | { .temp_c = -35, .ohm = 181742 }, | |
180 | { .temp_c = -30, .ohm = 135128 }, | |
181 | { .temp_c = -25, .ohm = 101678 }, | |
182 | { .temp_c = -20, .ohm = 77373 }, | |
183 | { .temp_c = -15, .ohm = 59504 }, | |
184 | { .temp_c = -10, .ohm = 46222 }, | |
185 | { .temp_c = -5, .ohm = 36244 }, | |
186 | { .temp_c = 0, .ohm = 28674 }, | |
187 | { .temp_c = 5, .ohm = 22878 }, | |
188 | { .temp_c = 10, .ohm = 18399 }, | |
189 | { .temp_c = 15, .ohm = 14910 }, | |
190 | { .temp_c = 20, .ohm = 12169 }, | |
191 | { .temp_c = 25, .ohm = 10000 }, | |
192 | { .temp_c = 30, .ohm = 8271 }, | |
193 | { .temp_c = 35, .ohm = 6883 }, | |
194 | { .temp_c = 40, .ohm = 5762 }, | |
195 | { .temp_c = 45, .ohm = 4851 }, | |
196 | { .temp_c = 50, .ohm = 4105 }, | |
197 | { .temp_c = 55, .ohm = 3492 }, | |
198 | { .temp_c = 60, .ohm = 2985 }, | |
199 | { .temp_c = 65, .ohm = 2563 }, | |
200 | { .temp_c = 70, .ohm = 2211 }, | |
201 | { .temp_c = 75, .ohm = 1915 }, | |
202 | { .temp_c = 80, .ohm = 1666 }, | |
203 | { .temp_c = 85, .ohm = 1454 }, | |
204 | { .temp_c = 90, .ohm = 1275 }, | |
205 | { .temp_c = 95, .ohm = 1121 }, | |
206 | { .temp_c = 100, .ohm = 990 }, | |
207 | { .temp_c = 105, .ohm = 876 }, | |
208 | { .temp_c = 110, .ohm = 779 }, | |
209 | { .temp_c = 115, .ohm = 694 }, | |
210 | { .temp_c = 120, .ohm = 620 }, | |
211 | { .temp_c = 125, .ohm = 556 }, | |
212 | }; | |
213 | ||
ed67f087 JP |
214 | /* |
215 | * The following compensation table is from the specification of EPCOS NTC | |
216 | * Thermistors Datasheet | |
217 | */ | |
218 | static const struct ntc_compensation b57330v2103[] = { | |
219 | { .temp_c = -40, .ohm = 190030 }, | |
220 | { .temp_c = -35, .ohm = 145360 }, | |
221 | { .temp_c = -30, .ohm = 112060 }, | |
222 | { .temp_c = -25, .ohm = 87041 }, | |
223 | { .temp_c = -20, .ohm = 68104 }, | |
224 | { .temp_c = -15, .ohm = 53665 }, | |
225 | { .temp_c = -10, .ohm = 42576 }, | |
226 | { .temp_c = -5, .ohm = 34001 }, | |
227 | { .temp_c = 0, .ohm = 27326 }, | |
228 | { .temp_c = 5, .ohm = 22096 }, | |
229 | { .temp_c = 10, .ohm = 17973 }, | |
230 | { .temp_c = 15, .ohm = 14703 }, | |
231 | { .temp_c = 20, .ohm = 12090 }, | |
232 | { .temp_c = 25, .ohm = 10000 }, | |
233 | { .temp_c = 30, .ohm = 8311 }, | |
234 | { .temp_c = 35, .ohm = 6941 }, | |
235 | { .temp_c = 40, .ohm = 5825 }, | |
236 | { .temp_c = 45, .ohm = 4911 }, | |
237 | { .temp_c = 50, .ohm = 4158 }, | |
238 | { .temp_c = 55, .ohm = 3536 }, | |
239 | { .temp_c = 60, .ohm = 3019 }, | |
240 | { .temp_c = 65, .ohm = 2588 }, | |
241 | { .temp_c = 70, .ohm = 2227 }, | |
242 | { .temp_c = 75, .ohm = 1924 }, | |
243 | { .temp_c = 80, .ohm = 1668 }, | |
244 | { .temp_c = 85, .ohm = 1451 }, | |
245 | { .temp_c = 90, .ohm = 1266 }, | |
246 | { .temp_c = 95, .ohm = 1108 }, | |
247 | { .temp_c = 100, .ohm = 973 }, | |
248 | { .temp_c = 105, .ohm = 857 }, | |
249 | { .temp_c = 110, .ohm = 757 }, | |
250 | { .temp_c = 115, .ohm = 671 }, | |
251 | { .temp_c = 120, .ohm = 596 }, | |
252 | { .temp_c = 125, .ohm = 531 }, | |
253 | }; | |
254 | ||
f22aaaa7 DK |
255 | struct ntc_data { |
256 | struct device *hwmon_dev; | |
257 | struct ntc_thermistor_platform_data *pdata; | |
258 | const struct ntc_compensation *comp; | |
259 | struct device *dev; | |
260 | int n_comp; | |
261 | char name[PLATFORM_NAME_SIZE]; | |
262 | }; | |
263 | ||
59cf4243 | 264 | #if defined(CONFIG_OF) && IS_ENABLED(CONFIG_IIO) |
9e8269de NKC |
265 | static 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); |
9e8269de NKC |
271 | if (ret < 0) { |
272 | pr_err("read channel() error: %d\n", ret); | |
273 | return ret; | |
274 | } | |
275 | ||
0315253b CL |
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; |
9e8269de NKC |
283 | } |
284 | ||
285 | static const struct of_device_id ntc_match[] = { | |
8b6f5e0f NKC |
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] }, | |
ed67f087 JP |
296 | { .compatible = "epcos,b57330v2103", |
297 | .data = &ntc_thermistor_id[5]}, | |
887ee434 BS |
298 | { .compatible = "murata,ncp03wf104", |
299 | .data = &ntc_thermistor_id[6] }, | |
54ce3a0d JM |
300 | { .compatible = "murata,ncp15xh103", |
301 | .data = &ntc_thermistor_id[7] }, | |
8b6f5e0f NKC |
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] }, |
9e8269de NKC |
314 | { }, |
315 | }; | |
316 | MODULE_DEVICE_TABLE(of, ntc_match); | |
317 | ||
318 | static struct ntc_thermistor_platform_data * | |
319 | ntc_thermistor_parse_dt(struct platform_device *pdev) | |
320 | { | |
321 | struct iio_channel *chan; | |
adba6575 | 322 | enum iio_chan_type type; |
9e8269de NKC |
323 | struct device_node *np = pdev->dev.of_node; |
324 | struct ntc_thermistor_platform_data *pdata; | |
adba6575 | 325 | int ret; |
9e8269de NKC |
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)) |
9e8269de NKC |
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; |
9e8269de NKC |
359 | |
360 | return pdata; | |
361 | } | |
362 | static 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 | |
368 | static struct ntc_thermistor_platform_data * | |
369 | ntc_thermistor_parse_dt(struct platform_device *pdev) | |
370 | { | |
371 | return NULL; | |
372 | } | |
373 | ||
59cf4243 JD |
374 | #define ntc_match NULL |
375 | ||
9e8269de NKC |
376 | static void ntc_iio_channel_release(struct ntc_thermistor_platform_data *pdata) |
377 | { } | |
378 | #endif | |
379 | ||
f22aaaa7 DK |
380 | static 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 | 389 | static int get_ohm_of_thermistor(struct ntc_data *data, unsigned int uv) |
f22aaaa7 DK |
390 | { |
391 | struct ntc_thermistor_platform_data *pdata = data->pdata; | |
f6725ae2 | 392 | u32 puv = pdata->pullup_uv; |
088ce2ac GR |
393 | u64 n, puo, pdo; |
394 | puo = pdata->pullup_ohm; | |
395 | pdo = pdata->pulldown_ohm; | |
f22aaaa7 | 396 | |
f6725ae2 CL |
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) |
f6725ae2 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 GR |
414 | if (n > INT_MAX) |
415 | n = INT_MAX; | |
416 | return n; | |
f22aaaa7 DK |
417 | } |
418 | ||
dbe43a62 GR |
419 | static void lookup_comp(struct ntc_data *data, unsigned int ohm, |
420 | int *i_low, int *i_high) | |
f22aaaa7 | 421 | { |
dbe43a62 GR |
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 | } | |
f22aaaa7 DK |
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; | |
f22aaaa7 DK |
483 | } |
484 | ||
088ce2ac | 485 | static int get_temp_mc(struct ntc_data *data, unsigned int ohm) |
f22aaaa7 DK |
486 | { |
487 | int low, high; | |
dbe43a62 | 488 | int temp; |
f22aaaa7 | 489 | |
dbe43a62 GR |
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 GR |
495 | temp = data->comp[low].temp_c * 1000 + |
496 | ((data->comp[high].temp_c - data->comp[low].temp_c) * | |
f22aaaa7 DK |
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; |
f22aaaa7 DK |
501 | } |
502 | ||
dbe43a62 | 503 | static 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; |
f22aaaa7 DK |
517 | } |
518 | ||
17e8351a | 519 | static 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 |
533 | static 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 | ||
541 | static ssize_t ntc_show_type(struct device *dev, | |
542 | struct device_attribute *attr, char *buf) | |
543 | { | |
544 | return sprintf(buf, "4\n"); | |
545 | } | |
546 | ||
547 | static 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 | ||
560 | static SENSOR_DEVICE_ATTR(temp1_type, S_IRUGO, ntc_show_type, NULL, 0); | |
561 | static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, ntc_show_temp, NULL, 0); | |
562 | static DEVICE_ATTR(name, S_IRUGO, ntc_show_name, NULL); | |
563 | ||
564 | static 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 | ||
571 | static const struct attribute_group ntc_attr_group = { | |
572 | .attrs = ntc_attributes, | |
573 | }; | |
574 | ||
2251aef6 EV |
575 | static const struct thermal_zone_of_device_ops ntc_of_thermal_ops = { |
576 | .get_temp = ntc_read_temp, | |
577 | }; | |
578 | ||
6c931ae1 | 579 | static 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; |
686 | err_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 | 692 | static 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 |
704 | static 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 | 714 | module_platform_driver(ntc_thermistor_driver); |
f22aaaa7 | 715 | |
ed67f087 | 716 | MODULE_DESCRIPTION("NTC Thermistor Driver"); |
f22aaaa7 DK |
717 | MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>"); |
718 | MODULE_LICENSE("GPL"); | |
719 | MODULE_ALIAS("platform:ntc-thermistor"); |