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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> | |
41 | ||
42 | struct ntc_compensation { | |
088ce2ac | 43 | int temp_c; |
f22aaaa7 DK |
44 | unsigned int ohm; |
45 | }; | |
46 | ||
9e8269de NKC |
47 | static const struct platform_device_id ntc_thermistor_id[] = { |
48 | { "ncp15wb473", TYPE_NCPXXWB473 }, | |
49 | { "ncp18wb473", TYPE_NCPXXWB473 }, | |
50 | { "ncp21wb473", TYPE_NCPXXWB473 }, | |
51 | { "ncp03wb473", TYPE_NCPXXWB473 }, | |
52 | { "ncp15wl333", TYPE_NCPXXWL333 }, | |
53 | { }, | |
54 | }; | |
55 | ||
f22aaaa7 DK |
56 | /* |
57 | * A compensation table should be sorted by the values of .ohm | |
58 | * in descending order. | |
59 | * The following compensation tables are from the specification of Murata NTC | |
60 | * Thermistors Datasheet | |
61 | */ | |
4626dcff | 62 | static const struct ntc_compensation ncpXXwb473[] = { |
088ce2ac GR |
63 | { .temp_c = -40, .ohm = 1747920 }, |
64 | { .temp_c = -35, .ohm = 1245428 }, | |
65 | { .temp_c = -30, .ohm = 898485 }, | |
66 | { .temp_c = -25, .ohm = 655802 }, | |
67 | { .temp_c = -20, .ohm = 483954 }, | |
68 | { .temp_c = -15, .ohm = 360850 }, | |
69 | { .temp_c = -10, .ohm = 271697 }, | |
70 | { .temp_c = -5, .ohm = 206463 }, | |
71 | { .temp_c = 0, .ohm = 158214 }, | |
72 | { .temp_c = 5, .ohm = 122259 }, | |
73 | { .temp_c = 10, .ohm = 95227 }, | |
74 | { .temp_c = 15, .ohm = 74730 }, | |
75 | { .temp_c = 20, .ohm = 59065 }, | |
76 | { .temp_c = 25, .ohm = 47000 }, | |
77 | { .temp_c = 30, .ohm = 37643 }, | |
78 | { .temp_c = 35, .ohm = 30334 }, | |
79 | { .temp_c = 40, .ohm = 24591 }, | |
80 | { .temp_c = 45, .ohm = 20048 }, | |
81 | { .temp_c = 50, .ohm = 16433 }, | |
82 | { .temp_c = 55, .ohm = 13539 }, | |
83 | { .temp_c = 60, .ohm = 11209 }, | |
84 | { .temp_c = 65, .ohm = 9328 }, | |
85 | { .temp_c = 70, .ohm = 7798 }, | |
86 | { .temp_c = 75, .ohm = 6544 }, | |
87 | { .temp_c = 80, .ohm = 5518 }, | |
88 | { .temp_c = 85, .ohm = 4674 }, | |
89 | { .temp_c = 90, .ohm = 3972 }, | |
90 | { .temp_c = 95, .ohm = 3388 }, | |
91 | { .temp_c = 100, .ohm = 2902 }, | |
92 | { .temp_c = 105, .ohm = 2494 }, | |
93 | { .temp_c = 110, .ohm = 2150 }, | |
94 | { .temp_c = 115, .ohm = 1860 }, | |
95 | { .temp_c = 120, .ohm = 1615 }, | |
96 | { .temp_c = 125, .ohm = 1406 }, | |
f22aaaa7 | 97 | }; |
4626dcff | 98 | static const struct ntc_compensation ncpXXwl333[] = { |
088ce2ac GR |
99 | { .temp_c = -40, .ohm = 1610154 }, |
100 | { .temp_c = -35, .ohm = 1130850 }, | |
101 | { .temp_c = -30, .ohm = 802609 }, | |
102 | { .temp_c = -25, .ohm = 575385 }, | |
103 | { .temp_c = -20, .ohm = 416464 }, | |
104 | { .temp_c = -15, .ohm = 304219 }, | |
105 | { .temp_c = -10, .ohm = 224193 }, | |
106 | { .temp_c = -5, .ohm = 166623 }, | |
107 | { .temp_c = 0, .ohm = 124850 }, | |
108 | { .temp_c = 5, .ohm = 94287 }, | |
109 | { .temp_c = 10, .ohm = 71747 }, | |
110 | { .temp_c = 15, .ohm = 54996 }, | |
111 | { .temp_c = 20, .ohm = 42455 }, | |
112 | { .temp_c = 25, .ohm = 33000 }, | |
113 | { .temp_c = 30, .ohm = 25822 }, | |
114 | { .temp_c = 35, .ohm = 20335 }, | |
115 | { .temp_c = 40, .ohm = 16115 }, | |
116 | { .temp_c = 45, .ohm = 12849 }, | |
117 | { .temp_c = 50, .ohm = 10306 }, | |
118 | { .temp_c = 55, .ohm = 8314 }, | |
119 | { .temp_c = 60, .ohm = 6746 }, | |
120 | { .temp_c = 65, .ohm = 5503 }, | |
121 | { .temp_c = 70, .ohm = 4513 }, | |
122 | { .temp_c = 75, .ohm = 3721 }, | |
123 | { .temp_c = 80, .ohm = 3084 }, | |
124 | { .temp_c = 85, .ohm = 2569 }, | |
125 | { .temp_c = 90, .ohm = 2151 }, | |
126 | { .temp_c = 95, .ohm = 1809 }, | |
127 | { .temp_c = 100, .ohm = 1529 }, | |
128 | { .temp_c = 105, .ohm = 1299 }, | |
129 | { .temp_c = 110, .ohm = 1108 }, | |
130 | { .temp_c = 115, .ohm = 949 }, | |
131 | { .temp_c = 120, .ohm = 817 }, | |
132 | { .temp_c = 125, .ohm = 707 }, | |
f22aaaa7 DK |
133 | }; |
134 | ||
135 | struct ntc_data { | |
136 | struct device *hwmon_dev; | |
137 | struct ntc_thermistor_platform_data *pdata; | |
138 | const struct ntc_compensation *comp; | |
139 | struct device *dev; | |
140 | int n_comp; | |
141 | char name[PLATFORM_NAME_SIZE]; | |
142 | }; | |
143 | ||
9e8269de NKC |
144 | #ifdef CONFIG_OF |
145 | static int ntc_adc_iio_read(struct ntc_thermistor_platform_data *pdata) | |
146 | { | |
147 | struct iio_channel *channel = pdata->chan; | |
148 | unsigned int result; | |
149 | int val, ret; | |
150 | ||
151 | ret = iio_read_channel_raw(channel, &val); | |
152 | if (ret < 0) { | |
153 | pr_err("read channel() error: %d\n", ret); | |
154 | return ret; | |
155 | } | |
156 | ||
157 | /* unit: mV */ | |
088ce2ac | 158 | result = pdata->pullup_uv * val; |
9e8269de NKC |
159 | result >>= 12; |
160 | ||
161 | return result; | |
162 | } | |
163 | ||
164 | static const struct of_device_id ntc_match[] = { | |
165 | { .compatible = "ntc,ncp15wb473", | |
166 | .data = &ntc_thermistor_id[TYPE_NCPXXWB473] }, | |
167 | { .compatible = "ntc,ncp18wb473", | |
168 | .data = &ntc_thermistor_id[TYPE_NCPXXWB473] }, | |
169 | { .compatible = "ntc,ncp21wb473", | |
170 | .data = &ntc_thermistor_id[TYPE_NCPXXWB473] }, | |
171 | { .compatible = "ntc,ncp03wb473", | |
172 | .data = &ntc_thermistor_id[TYPE_NCPXXWB473] }, | |
173 | { .compatible = "ntc,ncp15wl333", | |
174 | .data = &ntc_thermistor_id[TYPE_NCPXXWL333] }, | |
175 | { }, | |
176 | }; | |
177 | MODULE_DEVICE_TABLE(of, ntc_match); | |
178 | ||
179 | static struct ntc_thermistor_platform_data * | |
180 | ntc_thermistor_parse_dt(struct platform_device *pdev) | |
181 | { | |
182 | struct iio_channel *chan; | |
183 | struct device_node *np = pdev->dev.of_node; | |
184 | struct ntc_thermistor_platform_data *pdata; | |
185 | ||
186 | if (!np) | |
187 | return NULL; | |
188 | ||
189 | pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL); | |
190 | if (!pdata) | |
191 | return ERR_PTR(-ENOMEM); | |
192 | ||
193 | chan = iio_channel_get(&pdev->dev, NULL); | |
194 | if (IS_ERR(chan)) | |
195 | return ERR_CAST(chan); | |
196 | ||
088ce2ac | 197 | if (of_property_read_u32(np, "pullup-uv", &pdata->pullup_uv)) |
9e8269de NKC |
198 | return ERR_PTR(-ENODEV); |
199 | if (of_property_read_u32(np, "pullup-ohm", &pdata->pullup_ohm)) | |
200 | return ERR_PTR(-ENODEV); | |
201 | if (of_property_read_u32(np, "pulldown-ohm", &pdata->pulldown_ohm)) | |
202 | return ERR_PTR(-ENODEV); | |
203 | ||
204 | if (of_find_property(np, "connected-positive", NULL)) | |
205 | pdata->connect = NTC_CONNECTED_POSITIVE; | |
206 | else /* status change should be possible if not always on. */ | |
207 | pdata->connect = NTC_CONNECTED_GROUND; | |
208 | ||
209 | pdata->chan = chan; | |
088ce2ac | 210 | pdata->read_uv = ntc_adc_iio_read; |
9e8269de NKC |
211 | |
212 | return pdata; | |
213 | } | |
214 | static void ntc_iio_channel_release(struct ntc_thermistor_platform_data *pdata) | |
215 | { | |
216 | if (pdata->chan) | |
217 | iio_channel_release(pdata->chan); | |
218 | } | |
219 | #else | |
220 | static struct ntc_thermistor_platform_data * | |
221 | ntc_thermistor_parse_dt(struct platform_device *pdev) | |
222 | { | |
223 | return NULL; | |
224 | } | |
225 | ||
226 | static void ntc_iio_channel_release(struct ntc_thermistor_platform_data *pdata) | |
227 | { } | |
228 | #endif | |
229 | ||
f22aaaa7 DK |
230 | static inline u64 div64_u64_safe(u64 dividend, u64 divisor) |
231 | { | |
232 | if (divisor == 0 && dividend == 0) | |
233 | return 0; | |
234 | if (divisor == 0) | |
235 | return UINT_MAX; | |
236 | return div64_u64(dividend, divisor); | |
237 | } | |
238 | ||
088ce2ac | 239 | static int get_ohm_of_thermistor(struct ntc_data *data, unsigned int uv) |
f22aaaa7 DK |
240 | { |
241 | struct ntc_thermistor_platform_data *pdata = data->pdata; | |
088ce2ac GR |
242 | u64 mv = uv / 1000; |
243 | u64 pmv = pdata->pullup_uv / 1000; | |
244 | u64 n, puo, pdo; | |
245 | puo = pdata->pullup_ohm; | |
246 | pdo = pdata->pulldown_ohm; | |
f22aaaa7 | 247 | |
088ce2ac | 248 | if (mv == 0) { |
f22aaaa7 | 249 | if (pdata->connect == NTC_CONNECTED_POSITIVE) |
dbe43a62 | 250 | return INT_MAX; |
f22aaaa7 DK |
251 | return 0; |
252 | } | |
088ce2ac | 253 | if (mv >= pmv) |
f22aaaa7 | 254 | return (pdata->connect == NTC_CONNECTED_POSITIVE) ? |
dbe43a62 | 255 | 0 : INT_MAX; |
f22aaaa7 | 256 | |
088ce2ac GR |
257 | if (pdata->connect == NTC_CONNECTED_POSITIVE && puo == 0) |
258 | n = div64_u64_safe(pdo * (pmv - mv), mv); | |
259 | else if (pdata->connect == NTC_CONNECTED_GROUND && pdo == 0) | |
260 | n = div64_u64_safe(puo * mv, pmv - mv); | |
f22aaaa7 | 261 | else if (pdata->connect == NTC_CONNECTED_POSITIVE) |
088ce2ac GR |
262 | n = div64_u64_safe(pdo * puo * (pmv - mv), |
263 | puo * mv - pdo * (pmv - mv)); | |
f22aaaa7 | 264 | else |
088ce2ac | 265 | n = div64_u64_safe(pdo * puo * mv, pdo * (pmv - mv) - puo * mv); |
f22aaaa7 | 266 | |
088ce2ac GR |
267 | if (n > INT_MAX) |
268 | n = INT_MAX; | |
269 | return n; | |
f22aaaa7 DK |
270 | } |
271 | ||
dbe43a62 GR |
272 | static void lookup_comp(struct ntc_data *data, unsigned int ohm, |
273 | int *i_low, int *i_high) | |
f22aaaa7 | 274 | { |
dbe43a62 GR |
275 | int start, end, mid; |
276 | ||
277 | /* | |
278 | * Handle special cases: Resistance is higher than or equal to | |
279 | * resistance in first table entry, or resistance is lower or equal | |
280 | * to resistance in last table entry. | |
281 | * In these cases, return i_low == i_high, either pointing to the | |
282 | * beginning or to the end of the table depending on the condition. | |
283 | */ | |
284 | if (ohm >= data->comp[0].ohm) { | |
285 | *i_low = 0; | |
286 | *i_high = 0; | |
287 | return; | |
288 | } | |
289 | if (ohm <= data->comp[data->n_comp - 1].ohm) { | |
290 | *i_low = data->n_comp - 1; | |
291 | *i_high = data->n_comp - 1; | |
292 | return; | |
293 | } | |
f22aaaa7 DK |
294 | |
295 | /* Do a binary search on compensation table */ | |
296 | start = 0; | |
297 | end = data->n_comp; | |
dbe43a62 | 298 | while (start < end) { |
f22aaaa7 | 299 | mid = start + (end - start) / 2; |
dbe43a62 GR |
300 | /* |
301 | * start <= mid < end | |
302 | * data->comp[start].ohm > ohm >= data->comp[end].ohm | |
303 | * | |
304 | * We could check for "ohm == data->comp[mid].ohm" here, but | |
305 | * that is a quite unlikely condition, and we would have to | |
306 | * check again after updating start. Check it at the end instead | |
307 | * for simplicity. | |
308 | */ | |
309 | if (ohm >= data->comp[mid].ohm) { | |
f22aaaa7 | 310 | end = mid; |
f22aaaa7 | 311 | } else { |
dbe43a62 GR |
312 | start = mid + 1; |
313 | /* | |
314 | * ohm >= data->comp[start].ohm might be true here, | |
315 | * since we set start to mid + 1. In that case, we are | |
316 | * done. We could keep going, but the condition is quite | |
317 | * likely to occur, so it is worth checking for it. | |
318 | */ | |
319 | if (ohm >= data->comp[start].ohm) | |
320 | end = start; | |
f22aaaa7 | 321 | } |
dbe43a62 GR |
322 | /* |
323 | * start <= end | |
324 | * data->comp[start].ohm >= ohm >= data->comp[end].ohm | |
325 | */ | |
f22aaaa7 | 326 | } |
dbe43a62 GR |
327 | /* |
328 | * start == end | |
329 | * ohm >= data->comp[end].ohm | |
330 | */ | |
331 | *i_low = end; | |
332 | if (ohm == data->comp[end].ohm) | |
333 | *i_high = end; | |
334 | else | |
335 | *i_high = end - 1; | |
f22aaaa7 DK |
336 | } |
337 | ||
088ce2ac | 338 | static int get_temp_mc(struct ntc_data *data, unsigned int ohm) |
f22aaaa7 DK |
339 | { |
340 | int low, high; | |
dbe43a62 | 341 | int temp; |
f22aaaa7 | 342 | |
dbe43a62 GR |
343 | lookup_comp(data, ohm, &low, &high); |
344 | if (low == high) { | |
f22aaaa7 | 345 | /* Unable to use linear approximation */ |
088ce2ac | 346 | temp = data->comp[low].temp_c * 1000; |
f22aaaa7 | 347 | } else { |
088ce2ac GR |
348 | temp = data->comp[low].temp_c * 1000 + |
349 | ((data->comp[high].temp_c - data->comp[low].temp_c) * | |
f22aaaa7 DK |
350 | 1000 * ((int)ohm - (int)data->comp[low].ohm)) / |
351 | ((int)data->comp[high].ohm - (int)data->comp[low].ohm); | |
352 | } | |
dbe43a62 | 353 | return temp; |
f22aaaa7 DK |
354 | } |
355 | ||
dbe43a62 | 356 | static int ntc_thermistor_get_ohm(struct ntc_data *data) |
f22aaaa7 | 357 | { |
088ce2ac | 358 | int read_uv; |
f22aaaa7 | 359 | |
dbe43a62 GR |
360 | if (data->pdata->read_ohm) |
361 | return data->pdata->read_ohm(); | |
f22aaaa7 | 362 | |
088ce2ac GR |
363 | if (data->pdata->read_uv) { |
364 | read_uv = data->pdata->read_uv(data->pdata); | |
365 | if (read_uv < 0) | |
366 | return read_uv; | |
367 | return get_ohm_of_thermistor(data, read_uv); | |
f22aaaa7 | 368 | } |
dbe43a62 | 369 | return -EINVAL; |
f22aaaa7 DK |
370 | } |
371 | ||
372 | static ssize_t ntc_show_name(struct device *dev, | |
373 | struct device_attribute *attr, char *buf) | |
374 | { | |
375 | struct ntc_data *data = dev_get_drvdata(dev); | |
376 | ||
377 | return sprintf(buf, "%s\n", data->name); | |
378 | } | |
379 | ||
380 | static ssize_t ntc_show_type(struct device *dev, | |
381 | struct device_attribute *attr, char *buf) | |
382 | { | |
383 | return sprintf(buf, "4\n"); | |
384 | } | |
385 | ||
386 | static ssize_t ntc_show_temp(struct device *dev, | |
387 | struct device_attribute *attr, char *buf) | |
388 | { | |
389 | struct ntc_data *data = dev_get_drvdata(dev); | |
dbe43a62 GR |
390 | int ohm; |
391 | ||
392 | ohm = ntc_thermistor_get_ohm(data); | |
393 | if (ohm < 0) | |
394 | return ohm; | |
f22aaaa7 | 395 | |
088ce2ac | 396 | return sprintf(buf, "%d\n", get_temp_mc(data, ohm)); |
f22aaaa7 DK |
397 | } |
398 | ||
399 | static SENSOR_DEVICE_ATTR(temp1_type, S_IRUGO, ntc_show_type, NULL, 0); | |
400 | static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, ntc_show_temp, NULL, 0); | |
401 | static DEVICE_ATTR(name, S_IRUGO, ntc_show_name, NULL); | |
402 | ||
403 | static struct attribute *ntc_attributes[] = { | |
404 | &dev_attr_name.attr, | |
405 | &sensor_dev_attr_temp1_type.dev_attr.attr, | |
406 | &sensor_dev_attr_temp1_input.dev_attr.attr, | |
407 | NULL, | |
408 | }; | |
409 | ||
410 | static const struct attribute_group ntc_attr_group = { | |
411 | .attrs = ntc_attributes, | |
412 | }; | |
413 | ||
6c931ae1 | 414 | static int ntc_thermistor_probe(struct platform_device *pdev) |
f22aaaa7 | 415 | { |
9e8269de NKC |
416 | const struct of_device_id *of_id = |
417 | of_match_device(of_match_ptr(ntc_match), &pdev->dev); | |
418 | const struct platform_device_id *pdev_id; | |
419 | struct ntc_thermistor_platform_data *pdata; | |
f22aaaa7 | 420 | struct ntc_data *data; |
9e8269de NKC |
421 | int ret; |
422 | ||
423 | pdata = ntc_thermistor_parse_dt(pdev); | |
424 | if (IS_ERR(pdata)) | |
425 | return PTR_ERR(pdata); | |
426 | else if (pdata == NULL) | |
a8b3a3a5 | 427 | pdata = dev_get_platdata(&pdev->dev); |
f22aaaa7 DK |
428 | |
429 | if (!pdata) { | |
430 | dev_err(&pdev->dev, "No platform init data supplied.\n"); | |
431 | return -ENODEV; | |
432 | } | |
433 | ||
434 | /* Either one of the two is required. */ | |
088ce2ac | 435 | if (!pdata->read_uv && !pdata->read_ohm) { |
a7871def | 436 | dev_err(&pdev->dev, |
088ce2ac | 437 | "Both read_uv and read_ohm missing. Need either one of the two.\n"); |
f22aaaa7 DK |
438 | return -EINVAL; |
439 | } | |
440 | ||
088ce2ac | 441 | if (pdata->read_uv && pdata->read_ohm) { |
a7871def | 442 | dev_warn(&pdev->dev, |
088ce2ac GR |
443 | "Only one of read_uv and read_ohm is needed; ignoring read_uv.\n"); |
444 | pdata->read_uv = NULL; | |
f22aaaa7 DK |
445 | } |
446 | ||
088ce2ac | 447 | if (pdata->read_uv && (pdata->pullup_uv == 0 || |
f22aaaa7 DK |
448 | (pdata->pullup_ohm == 0 && pdata->connect == |
449 | NTC_CONNECTED_GROUND) || | |
450 | (pdata->pulldown_ohm == 0 && pdata->connect == | |
451 | NTC_CONNECTED_POSITIVE) || | |
452 | (pdata->connect != NTC_CONNECTED_POSITIVE && | |
453 | pdata->connect != NTC_CONNECTED_GROUND))) { | |
a7871def | 454 | dev_err(&pdev->dev, |
088ce2ac | 455 | "Required data to use read_uv not supplied.\n"); |
f22aaaa7 DK |
456 | return -EINVAL; |
457 | } | |
458 | ||
41141e64 | 459 | data = devm_kzalloc(&pdev->dev, sizeof(struct ntc_data), GFP_KERNEL); |
f22aaaa7 DK |
460 | if (!data) |
461 | return -ENOMEM; | |
462 | ||
9e8269de NKC |
463 | pdev_id = of_id ? of_id->data : platform_get_device_id(pdev); |
464 | ||
f22aaaa7 DK |
465 | data->dev = &pdev->dev; |
466 | data->pdata = pdata; | |
9e8269de | 467 | strlcpy(data->name, pdev_id->name, sizeof(data->name)); |
f22aaaa7 | 468 | |
9e8269de | 469 | switch (pdev_id->driver_data) { |
f22aaaa7 DK |
470 | case TYPE_NCPXXWB473: |
471 | data->comp = ncpXXwb473; | |
472 | data->n_comp = ARRAY_SIZE(ncpXXwb473); | |
473 | break; | |
474 | case TYPE_NCPXXWL333: | |
475 | data->comp = ncpXXwl333; | |
476 | data->n_comp = ARRAY_SIZE(ncpXXwl333); | |
477 | break; | |
478 | default: | |
479 | dev_err(&pdev->dev, "Unknown device type: %lu(%s)\n", | |
9e8269de | 480 | pdev_id->driver_data, pdev_id->name); |
41141e64 | 481 | return -EINVAL; |
f22aaaa7 DK |
482 | } |
483 | ||
484 | platform_set_drvdata(pdev, data); | |
485 | ||
486 | ret = sysfs_create_group(&data->dev->kobj, &ntc_attr_group); | |
487 | if (ret) { | |
488 | dev_err(data->dev, "unable to create sysfs files\n"); | |
41141e64 | 489 | return ret; |
f22aaaa7 DK |
490 | } |
491 | ||
492 | data->hwmon_dev = hwmon_device_register(data->dev); | |
425d2476 | 493 | if (IS_ERR(data->hwmon_dev)) { |
f22aaaa7 | 494 | dev_err(data->dev, "unable to register as hwmon device.\n"); |
425d2476 | 495 | ret = PTR_ERR(data->hwmon_dev); |
f22aaaa7 DK |
496 | goto err_after_sysfs; |
497 | } | |
498 | ||
9e8269de NKC |
499 | dev_info(&pdev->dev, "Thermistor type: %s successfully probed.\n", |
500 | pdev->name); | |
501 | ||
f22aaaa7 DK |
502 | return 0; |
503 | err_after_sysfs: | |
504 | sysfs_remove_group(&data->dev->kobj, &ntc_attr_group); | |
9e8269de | 505 | ntc_iio_channel_release(pdata); |
f22aaaa7 DK |
506 | return ret; |
507 | } | |
508 | ||
281dfd0b | 509 | static int ntc_thermistor_remove(struct platform_device *pdev) |
f22aaaa7 DK |
510 | { |
511 | struct ntc_data *data = platform_get_drvdata(pdev); | |
9e8269de | 512 | struct ntc_thermistor_platform_data *pdata = data->pdata; |
f22aaaa7 DK |
513 | |
514 | hwmon_device_unregister(data->hwmon_dev); | |
515 | sysfs_remove_group(&data->dev->kobj, &ntc_attr_group); | |
9e8269de | 516 | ntc_iio_channel_release(pdata); |
f22aaaa7 | 517 | |
f22aaaa7 DK |
518 | return 0; |
519 | } | |
520 | ||
f22aaaa7 DK |
521 | static struct platform_driver ntc_thermistor_driver = { |
522 | .driver = { | |
523 | .name = "ntc-thermistor", | |
524 | .owner = THIS_MODULE, | |
9e8269de | 525 | .of_match_table = of_match_ptr(ntc_match), |
f22aaaa7 DK |
526 | }, |
527 | .probe = ntc_thermistor_probe, | |
9e5e9b7a | 528 | .remove = ntc_thermistor_remove, |
f22aaaa7 DK |
529 | .id_table = ntc_thermistor_id, |
530 | }; | |
531 | ||
25a236a5 | 532 | module_platform_driver(ntc_thermistor_driver); |
f22aaaa7 DK |
533 | |
534 | MODULE_DESCRIPTION("NTC Thermistor Driver"); | |
535 | MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>"); | |
536 | MODULE_LICENSE("GPL"); | |
537 | MODULE_ALIAS("platform:ntc-thermistor"); |