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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 }, |
9e8269de NKC |
57 | { }, |
58 | }; | |
59 | ||
f22aaaa7 DK |
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 | 66 | static const struct ntc_compensation ncpXXwb473[] = { |
088ce2ac GR |
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 | 102 | static const struct ntc_compensation ncpXXwl333[] = { |
088ce2ac GR |
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 }, | |
f22aaaa7 DK |
137 | }; |
138 | ||
887ee434 BS |
139 | static 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 | ||
ed67f087 JP |
176 | /* |
177 | * The following compensation table is from the specification of EPCOS NTC | |
178 | * Thermistors Datasheet | |
179 | */ | |
180 | static 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 | ||
f22aaaa7 DK |
217 | struct 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; |
f22aaaa7 DK |
225 | }; |
226 | ||
59cf4243 | 227 | #if defined(CONFIG_OF) && IS_ENABLED(CONFIG_IIO) |
9e8269de NKC |
228 | static int ntc_adc_iio_read(struct ntc_thermistor_platform_data *pdata) |
229 | { | |
230 | struct iio_channel *channel = pdata->chan; | |
d3d89c46 | 231 | s64 result; |
9e8269de NKC |
232 | int val, ret; |
233 | ||
234 | ret = iio_read_channel_raw(channel, &val); | |
235 | if (ret < 0) { | |
236 | pr_err("read channel() error: %d\n", ret); | |
237 | return ret; | |
238 | } | |
239 | ||
240 | /* unit: mV */ | |
d3d89c46 | 241 | result = pdata->pullup_uv * (s64) val; |
9e8269de NKC |
242 | result >>= 12; |
243 | ||
d3d89c46 | 244 | return (int)result; |
9e8269de NKC |
245 | } |
246 | ||
247 | static const struct of_device_id ntc_match[] = { | |
8b6f5e0f NKC |
248 | { .compatible = "murata,ncp15wb473", |
249 | .data = &ntc_thermistor_id[0] }, | |
250 | { .compatible = "murata,ncp18wb473", | |
251 | .data = &ntc_thermistor_id[1] }, | |
252 | { .compatible = "murata,ncp21wb473", | |
253 | .data = &ntc_thermistor_id[2] }, | |
254 | { .compatible = "murata,ncp03wb473", | |
255 | .data = &ntc_thermistor_id[3] }, | |
256 | { .compatible = "murata,ncp15wl333", | |
257 | .data = &ntc_thermistor_id[4] }, | |
ed67f087 JP |
258 | { .compatible = "epcos,b57330v2103", |
259 | .data = &ntc_thermistor_id[5]}, | |
887ee434 BS |
260 | { .compatible = "murata,ncp03wf104", |
261 | .data = &ntc_thermistor_id[6] }, | |
8b6f5e0f NKC |
262 | |
263 | /* Usage of vendor name "ntc" is deprecated */ | |
9e8269de | 264 | { .compatible = "ntc,ncp15wb473", |
ead82d67 | 265 | .data = &ntc_thermistor_id[0] }, |
9e8269de | 266 | { .compatible = "ntc,ncp18wb473", |
ead82d67 | 267 | .data = &ntc_thermistor_id[1] }, |
9e8269de | 268 | { .compatible = "ntc,ncp21wb473", |
ead82d67 | 269 | .data = &ntc_thermistor_id[2] }, |
9e8269de | 270 | { .compatible = "ntc,ncp03wb473", |
ead82d67 | 271 | .data = &ntc_thermistor_id[3] }, |
9e8269de | 272 | { .compatible = "ntc,ncp15wl333", |
ead82d67 | 273 | .data = &ntc_thermistor_id[4] }, |
9e8269de NKC |
274 | { }, |
275 | }; | |
276 | MODULE_DEVICE_TABLE(of, ntc_match); | |
277 | ||
278 | static struct ntc_thermistor_platform_data * | |
279 | ntc_thermistor_parse_dt(struct platform_device *pdev) | |
280 | { | |
281 | struct iio_channel *chan; | |
adba6575 | 282 | enum iio_chan_type type; |
9e8269de NKC |
283 | struct device_node *np = pdev->dev.of_node; |
284 | struct ntc_thermistor_platform_data *pdata; | |
adba6575 | 285 | int ret; |
9e8269de NKC |
286 | |
287 | if (!np) | |
288 | return NULL; | |
289 | ||
290 | pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL); | |
291 | if (!pdata) | |
292 | return ERR_PTR(-ENOMEM); | |
293 | ||
294 | chan = iio_channel_get(&pdev->dev, NULL); | |
295 | if (IS_ERR(chan)) | |
296 | return ERR_CAST(chan); | |
297 | ||
adba6575 CL |
298 | ret = iio_get_channel_type(chan, &type); |
299 | if (ret < 0) | |
300 | return ERR_PTR(ret); | |
301 | ||
302 | if (type != IIO_VOLTAGE) | |
303 | return ERR_PTR(-EINVAL); | |
304 | ||
088ce2ac | 305 | if (of_property_read_u32(np, "pullup-uv", &pdata->pullup_uv)) |
9e8269de NKC |
306 | return ERR_PTR(-ENODEV); |
307 | if (of_property_read_u32(np, "pullup-ohm", &pdata->pullup_ohm)) | |
308 | return ERR_PTR(-ENODEV); | |
309 | if (of_property_read_u32(np, "pulldown-ohm", &pdata->pulldown_ohm)) | |
310 | return ERR_PTR(-ENODEV); | |
311 | ||
312 | if (of_find_property(np, "connected-positive", NULL)) | |
313 | pdata->connect = NTC_CONNECTED_POSITIVE; | |
314 | else /* status change should be possible if not always on. */ | |
315 | pdata->connect = NTC_CONNECTED_GROUND; | |
316 | ||
317 | pdata->chan = chan; | |
088ce2ac | 318 | pdata->read_uv = ntc_adc_iio_read; |
9e8269de NKC |
319 | |
320 | return pdata; | |
321 | } | |
322 | static void ntc_iio_channel_release(struct ntc_thermistor_platform_data *pdata) | |
323 | { | |
324 | if (pdata->chan) | |
325 | iio_channel_release(pdata->chan); | |
326 | } | |
327 | #else | |
328 | static struct ntc_thermistor_platform_data * | |
329 | ntc_thermistor_parse_dt(struct platform_device *pdev) | |
330 | { | |
331 | return NULL; | |
332 | } | |
333 | ||
59cf4243 JD |
334 | #define ntc_match NULL |
335 | ||
9e8269de NKC |
336 | static void ntc_iio_channel_release(struct ntc_thermistor_platform_data *pdata) |
337 | { } | |
338 | #endif | |
339 | ||
f22aaaa7 DK |
340 | static inline u64 div64_u64_safe(u64 dividend, u64 divisor) |
341 | { | |
342 | if (divisor == 0 && dividend == 0) | |
343 | return 0; | |
344 | if (divisor == 0) | |
345 | return UINT_MAX; | |
346 | return div64_u64(dividend, divisor); | |
347 | } | |
348 | ||
088ce2ac | 349 | static int get_ohm_of_thermistor(struct ntc_data *data, unsigned int uv) |
f22aaaa7 DK |
350 | { |
351 | struct ntc_thermistor_platform_data *pdata = data->pdata; | |
088ce2ac GR |
352 | u64 mv = uv / 1000; |
353 | u64 pmv = pdata->pullup_uv / 1000; | |
354 | u64 n, puo, pdo; | |
355 | puo = pdata->pullup_ohm; | |
356 | pdo = pdata->pulldown_ohm; | |
f22aaaa7 | 357 | |
088ce2ac | 358 | if (mv == 0) { |
f22aaaa7 | 359 | if (pdata->connect == NTC_CONNECTED_POSITIVE) |
dbe43a62 | 360 | return INT_MAX; |
f22aaaa7 DK |
361 | return 0; |
362 | } | |
088ce2ac | 363 | if (mv >= pmv) |
f22aaaa7 | 364 | return (pdata->connect == NTC_CONNECTED_POSITIVE) ? |
dbe43a62 | 365 | 0 : INT_MAX; |
f22aaaa7 | 366 | |
088ce2ac GR |
367 | if (pdata->connect == NTC_CONNECTED_POSITIVE && puo == 0) |
368 | n = div64_u64_safe(pdo * (pmv - mv), mv); | |
369 | else if (pdata->connect == NTC_CONNECTED_GROUND && pdo == 0) | |
370 | n = div64_u64_safe(puo * mv, pmv - mv); | |
f22aaaa7 | 371 | else if (pdata->connect == NTC_CONNECTED_POSITIVE) |
088ce2ac GR |
372 | n = div64_u64_safe(pdo * puo * (pmv - mv), |
373 | puo * mv - pdo * (pmv - mv)); | |
f22aaaa7 | 374 | else |
088ce2ac | 375 | n = div64_u64_safe(pdo * puo * mv, pdo * (pmv - mv) - puo * mv); |
f22aaaa7 | 376 | |
088ce2ac GR |
377 | if (n > INT_MAX) |
378 | n = INT_MAX; | |
379 | return n; | |
f22aaaa7 DK |
380 | } |
381 | ||
dbe43a62 GR |
382 | static void lookup_comp(struct ntc_data *data, unsigned int ohm, |
383 | int *i_low, int *i_high) | |
f22aaaa7 | 384 | { |
dbe43a62 GR |
385 | int start, end, mid; |
386 | ||
387 | /* | |
388 | * Handle special cases: Resistance is higher than or equal to | |
389 | * resistance in first table entry, or resistance is lower or equal | |
390 | * to resistance in last table entry. | |
391 | * In these cases, return i_low == i_high, either pointing to the | |
392 | * beginning or to the end of the table depending on the condition. | |
393 | */ | |
394 | if (ohm >= data->comp[0].ohm) { | |
395 | *i_low = 0; | |
396 | *i_high = 0; | |
397 | return; | |
398 | } | |
399 | if (ohm <= data->comp[data->n_comp - 1].ohm) { | |
400 | *i_low = data->n_comp - 1; | |
401 | *i_high = data->n_comp - 1; | |
402 | return; | |
403 | } | |
f22aaaa7 DK |
404 | |
405 | /* Do a binary search on compensation table */ | |
406 | start = 0; | |
407 | end = data->n_comp; | |
dbe43a62 | 408 | while (start < end) { |
f22aaaa7 | 409 | mid = start + (end - start) / 2; |
dbe43a62 GR |
410 | /* |
411 | * start <= mid < end | |
412 | * data->comp[start].ohm > ohm >= data->comp[end].ohm | |
413 | * | |
414 | * We could check for "ohm == data->comp[mid].ohm" here, but | |
415 | * that is a quite unlikely condition, and we would have to | |
416 | * check again after updating start. Check it at the end instead | |
417 | * for simplicity. | |
418 | */ | |
419 | if (ohm >= data->comp[mid].ohm) { | |
f22aaaa7 | 420 | end = mid; |
f22aaaa7 | 421 | } else { |
dbe43a62 GR |
422 | start = mid + 1; |
423 | /* | |
424 | * ohm >= data->comp[start].ohm might be true here, | |
425 | * since we set start to mid + 1. In that case, we are | |
426 | * done. We could keep going, but the condition is quite | |
427 | * likely to occur, so it is worth checking for it. | |
428 | */ | |
429 | if (ohm >= data->comp[start].ohm) | |
430 | end = start; | |
f22aaaa7 | 431 | } |
dbe43a62 GR |
432 | /* |
433 | * start <= end | |
434 | * data->comp[start].ohm >= ohm >= data->comp[end].ohm | |
435 | */ | |
f22aaaa7 | 436 | } |
dbe43a62 GR |
437 | /* |
438 | * start == end | |
439 | * ohm >= data->comp[end].ohm | |
440 | */ | |
441 | *i_low = end; | |
442 | if (ohm == data->comp[end].ohm) | |
443 | *i_high = end; | |
444 | else | |
445 | *i_high = end - 1; | |
f22aaaa7 DK |
446 | } |
447 | ||
088ce2ac | 448 | static int get_temp_mc(struct ntc_data *data, unsigned int ohm) |
f22aaaa7 DK |
449 | { |
450 | int low, high; | |
dbe43a62 | 451 | int temp; |
f22aaaa7 | 452 | |
dbe43a62 GR |
453 | lookup_comp(data, ohm, &low, &high); |
454 | if (low == high) { | |
f22aaaa7 | 455 | /* Unable to use linear approximation */ |
088ce2ac | 456 | temp = data->comp[low].temp_c * 1000; |
f22aaaa7 | 457 | } else { |
088ce2ac GR |
458 | temp = data->comp[low].temp_c * 1000 + |
459 | ((data->comp[high].temp_c - data->comp[low].temp_c) * | |
f22aaaa7 DK |
460 | 1000 * ((int)ohm - (int)data->comp[low].ohm)) / |
461 | ((int)data->comp[high].ohm - (int)data->comp[low].ohm); | |
462 | } | |
dbe43a62 | 463 | return temp; |
f22aaaa7 DK |
464 | } |
465 | ||
dbe43a62 | 466 | static int ntc_thermistor_get_ohm(struct ntc_data *data) |
f22aaaa7 | 467 | { |
088ce2ac | 468 | int read_uv; |
f22aaaa7 | 469 | |
dbe43a62 GR |
470 | if (data->pdata->read_ohm) |
471 | return data->pdata->read_ohm(); | |
f22aaaa7 | 472 | |
088ce2ac GR |
473 | if (data->pdata->read_uv) { |
474 | read_uv = data->pdata->read_uv(data->pdata); | |
475 | if (read_uv < 0) | |
476 | return read_uv; | |
477 | return get_ohm_of_thermistor(data, read_uv); | |
f22aaaa7 | 478 | } |
dbe43a62 | 479 | return -EINVAL; |
f22aaaa7 DK |
480 | } |
481 | ||
c08860ff JL |
482 | static int ntc_read_temp(void *dev, long *temp) |
483 | { | |
484 | struct ntc_data *data = dev_get_drvdata(dev); | |
485 | int ohm; | |
486 | ||
487 | ohm = ntc_thermistor_get_ohm(data); | |
488 | if (ohm < 0) | |
489 | return ohm; | |
490 | ||
491 | *temp = get_temp_mc(data, ohm); | |
492 | ||
493 | return 0; | |
494 | } | |
495 | ||
f22aaaa7 DK |
496 | static ssize_t ntc_show_name(struct device *dev, |
497 | struct device_attribute *attr, char *buf) | |
498 | { | |
499 | struct ntc_data *data = dev_get_drvdata(dev); | |
500 | ||
501 | return sprintf(buf, "%s\n", data->name); | |
502 | } | |
503 | ||
504 | static ssize_t ntc_show_type(struct device *dev, | |
505 | struct device_attribute *attr, char *buf) | |
506 | { | |
507 | return sprintf(buf, "4\n"); | |
508 | } | |
509 | ||
510 | static ssize_t ntc_show_temp(struct device *dev, | |
511 | struct device_attribute *attr, char *buf) | |
512 | { | |
513 | struct ntc_data *data = dev_get_drvdata(dev); | |
dbe43a62 GR |
514 | int ohm; |
515 | ||
516 | ohm = ntc_thermistor_get_ohm(data); | |
517 | if (ohm < 0) | |
518 | return ohm; | |
f22aaaa7 | 519 | |
088ce2ac | 520 | return sprintf(buf, "%d\n", get_temp_mc(data, ohm)); |
f22aaaa7 DK |
521 | } |
522 | ||
523 | static SENSOR_DEVICE_ATTR(temp1_type, S_IRUGO, ntc_show_type, NULL, 0); | |
524 | static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, ntc_show_temp, NULL, 0); | |
525 | static DEVICE_ATTR(name, S_IRUGO, ntc_show_name, NULL); | |
526 | ||
527 | static struct attribute *ntc_attributes[] = { | |
528 | &dev_attr_name.attr, | |
529 | &sensor_dev_attr_temp1_type.dev_attr.attr, | |
530 | &sensor_dev_attr_temp1_input.dev_attr.attr, | |
531 | NULL, | |
532 | }; | |
533 | ||
534 | static const struct attribute_group ntc_attr_group = { | |
535 | .attrs = ntc_attributes, | |
536 | }; | |
537 | ||
2251aef6 EV |
538 | static const struct thermal_zone_of_device_ops ntc_of_thermal_ops = { |
539 | .get_temp = ntc_read_temp, | |
540 | }; | |
541 | ||
6c931ae1 | 542 | static int ntc_thermistor_probe(struct platform_device *pdev) |
f22aaaa7 | 543 | { |
9e8269de NKC |
544 | const struct of_device_id *of_id = |
545 | of_match_device(of_match_ptr(ntc_match), &pdev->dev); | |
546 | const struct platform_device_id *pdev_id; | |
547 | struct ntc_thermistor_platform_data *pdata; | |
f22aaaa7 | 548 | struct ntc_data *data; |
9e8269de NKC |
549 | int ret; |
550 | ||
551 | pdata = ntc_thermistor_parse_dt(pdev); | |
552 | if (IS_ERR(pdata)) | |
553 | return PTR_ERR(pdata); | |
554 | else if (pdata == NULL) | |
a8b3a3a5 | 555 | pdata = dev_get_platdata(&pdev->dev); |
f22aaaa7 DK |
556 | |
557 | if (!pdata) { | |
558 | dev_err(&pdev->dev, "No platform init data supplied.\n"); | |
559 | return -ENODEV; | |
560 | } | |
561 | ||
562 | /* Either one of the two is required. */ | |
088ce2ac | 563 | if (!pdata->read_uv && !pdata->read_ohm) { |
a7871def | 564 | dev_err(&pdev->dev, |
088ce2ac | 565 | "Both read_uv and read_ohm missing. Need either one of the two.\n"); |
f22aaaa7 DK |
566 | return -EINVAL; |
567 | } | |
568 | ||
088ce2ac | 569 | if (pdata->read_uv && pdata->read_ohm) { |
a7871def | 570 | dev_warn(&pdev->dev, |
088ce2ac GR |
571 | "Only one of read_uv and read_ohm is needed; ignoring read_uv.\n"); |
572 | pdata->read_uv = NULL; | |
f22aaaa7 DK |
573 | } |
574 | ||
088ce2ac | 575 | if (pdata->read_uv && (pdata->pullup_uv == 0 || |
f22aaaa7 DK |
576 | (pdata->pullup_ohm == 0 && pdata->connect == |
577 | NTC_CONNECTED_GROUND) || | |
578 | (pdata->pulldown_ohm == 0 && pdata->connect == | |
579 | NTC_CONNECTED_POSITIVE) || | |
580 | (pdata->connect != NTC_CONNECTED_POSITIVE && | |
581 | pdata->connect != NTC_CONNECTED_GROUND))) { | |
a7871def | 582 | dev_err(&pdev->dev, |
088ce2ac | 583 | "Required data to use read_uv not supplied.\n"); |
f22aaaa7 DK |
584 | return -EINVAL; |
585 | } | |
586 | ||
41141e64 | 587 | data = devm_kzalloc(&pdev->dev, sizeof(struct ntc_data), GFP_KERNEL); |
f22aaaa7 DK |
588 | if (!data) |
589 | return -ENOMEM; | |
590 | ||
9e8269de NKC |
591 | pdev_id = of_id ? of_id->data : platform_get_device_id(pdev); |
592 | ||
f22aaaa7 DK |
593 | data->dev = &pdev->dev; |
594 | data->pdata = pdata; | |
9e8269de | 595 | strlcpy(data->name, pdev_id->name, sizeof(data->name)); |
f22aaaa7 | 596 | |
9e8269de | 597 | switch (pdev_id->driver_data) { |
f22aaaa7 DK |
598 | case TYPE_NCPXXWB473: |
599 | data->comp = ncpXXwb473; | |
600 | data->n_comp = ARRAY_SIZE(ncpXXwb473); | |
601 | break; | |
602 | case TYPE_NCPXXWL333: | |
603 | data->comp = ncpXXwl333; | |
604 | data->n_comp = ARRAY_SIZE(ncpXXwl333); | |
605 | break; | |
ed67f087 JP |
606 | case TYPE_B57330V2103: |
607 | data->comp = b57330v2103; | |
608 | data->n_comp = ARRAY_SIZE(b57330v2103); | |
609 | break; | |
887ee434 BS |
610 | case TYPE_NCPXXWF104: |
611 | data->comp = ncpXXwf104; | |
612 | data->n_comp = ARRAY_SIZE(ncpXXwf104); | |
613 | break; | |
f22aaaa7 DK |
614 | default: |
615 | dev_err(&pdev->dev, "Unknown device type: %lu(%s)\n", | |
9e8269de | 616 | pdev_id->driver_data, pdev_id->name); |
41141e64 | 617 | return -EINVAL; |
f22aaaa7 DK |
618 | } |
619 | ||
620 | platform_set_drvdata(pdev, data); | |
621 | ||
622 | ret = sysfs_create_group(&data->dev->kobj, &ntc_attr_group); | |
623 | if (ret) { | |
624 | dev_err(data->dev, "unable to create sysfs files\n"); | |
41141e64 | 625 | return ret; |
f22aaaa7 DK |
626 | } |
627 | ||
628 | data->hwmon_dev = hwmon_device_register(data->dev); | |
425d2476 | 629 | if (IS_ERR(data->hwmon_dev)) { |
f22aaaa7 | 630 | dev_err(data->dev, "unable to register as hwmon device.\n"); |
425d2476 | 631 | ret = PTR_ERR(data->hwmon_dev); |
f22aaaa7 DK |
632 | goto err_after_sysfs; |
633 | } | |
634 | ||
9e8269de | 635 | dev_info(&pdev->dev, "Thermistor type: %s successfully probed.\n", |
93a88ef3 | 636 | pdev_id->name); |
9e8269de | 637 | |
c08860ff | 638 | data->tz = thermal_zone_of_sensor_register(data->dev, 0, data->dev, |
2251aef6 | 639 | &ntc_of_thermal_ops); |
c08860ff JL |
640 | if (IS_ERR(data->tz)) { |
641 | dev_dbg(&pdev->dev, "Failed to register to thermal fw.\n"); | |
642 | data->tz = NULL; | |
643 | } | |
644 | ||
f22aaaa7 DK |
645 | return 0; |
646 | err_after_sysfs: | |
647 | sysfs_remove_group(&data->dev->kobj, &ntc_attr_group); | |
9e8269de | 648 | ntc_iio_channel_release(pdata); |
f22aaaa7 DK |
649 | return ret; |
650 | } | |
651 | ||
281dfd0b | 652 | static int ntc_thermistor_remove(struct platform_device *pdev) |
f22aaaa7 DK |
653 | { |
654 | struct ntc_data *data = platform_get_drvdata(pdev); | |
9e8269de | 655 | struct ntc_thermistor_platform_data *pdata = data->pdata; |
f22aaaa7 DK |
656 | |
657 | hwmon_device_unregister(data->hwmon_dev); | |
658 | sysfs_remove_group(&data->dev->kobj, &ntc_attr_group); | |
9e8269de | 659 | ntc_iio_channel_release(pdata); |
f22aaaa7 | 660 | |
c08860ff JL |
661 | thermal_zone_of_sensor_unregister(data->dev, data->tz); |
662 | ||
f22aaaa7 DK |
663 | return 0; |
664 | } | |
665 | ||
f22aaaa7 DK |
666 | static struct platform_driver ntc_thermistor_driver = { |
667 | .driver = { | |
668 | .name = "ntc-thermistor", | |
9e8269de | 669 | .of_match_table = of_match_ptr(ntc_match), |
f22aaaa7 DK |
670 | }, |
671 | .probe = ntc_thermistor_probe, | |
9e5e9b7a | 672 | .remove = ntc_thermistor_remove, |
f22aaaa7 DK |
673 | .id_table = ntc_thermistor_id, |
674 | }; | |
675 | ||
25a236a5 | 676 | module_platform_driver(ntc_thermistor_driver); |
f22aaaa7 | 677 | |
ed67f087 | 678 | MODULE_DESCRIPTION("NTC Thermistor Driver"); |
f22aaaa7 DK |
679 | MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>"); |
680 | MODULE_LICENSE("GPL"); | |
681 | MODULE_ALIAS("platform:ntc-thermistor"); |