2 * ntc_thermistor.c - NTC Thermistors
4 * Copyright (C) 2010 Samsung Electronics
5 * MyungJoo Ham <myungjoo.ham@samsung.com>
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.
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.
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
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>
30 #include <linux/of_device.h>
32 #include <linux/platform_data/ntc_thermistor.h>
34 #include <linux/iio/iio.h>
35 #include <linux/iio/machine.h>
36 #include <linux/iio/driver.h>
37 #include <linux/iio/consumer.h>
39 #include <linux/hwmon.h>
40 #include <linux/hwmon-sysfs.h>
41 #include <linux/thermal.h>
43 struct ntc_compensation
{
48 /* Order matters, ntc_match references the entries by index */
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
},
55 { "b57330v2103", TYPE_B57330V2103
},
56 { "ncp03wf104", TYPE_NCPXXWF104
},
57 { "ncp15xh103", TYPE_NCPXXXH103
},
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
67 static const struct ntc_compensation ncpXXwb473
[] = {
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 },
103 static const struct ntc_compensation ncpXXwl333
[] = {
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 },
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 },
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 },
215 * The following compensation table is from the specification of EPCOS NTC
216 * Thermistors Datasheet
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 },
256 struct device
*hwmon_dev
;
257 struct ntc_thermistor_platform_data
*pdata
;
258 const struct ntc_compensation
*comp
;
261 char name
[PLATFORM_NAME_SIZE
];
262 struct thermal_zone_device
*tz
;
265 #if defined(CONFIG_OF) && IS_ENABLED(CONFIG_IIO)
266 static int ntc_adc_iio_read(struct ntc_thermistor_platform_data
*pdata
)
268 struct iio_channel
*channel
= pdata
->chan
;
271 ret
= iio_read_channel_raw(channel
, &raw
);
273 pr_err("read channel() error: %d\n", ret
);
277 ret
= iio_convert_raw_to_processed(channel
, raw
, &uv
, 1000);
279 /* Assume 12 bit ADC with vref at pullup_uv */
280 uv
= (pdata
->pullup_uv
* (s64
)raw
) >> 12;
286 static const struct of_device_id ntc_match
[] = {
287 { .compatible
= "murata,ncp15wb473",
288 .data
= &ntc_thermistor_id
[0] },
289 { .compatible
= "murata,ncp18wb473",
290 .data
= &ntc_thermistor_id
[1] },
291 { .compatible
= "murata,ncp21wb473",
292 .data
= &ntc_thermistor_id
[2] },
293 { .compatible
= "murata,ncp03wb473",
294 .data
= &ntc_thermistor_id
[3] },
295 { .compatible
= "murata,ncp15wl333",
296 .data
= &ntc_thermistor_id
[4] },
297 { .compatible
= "epcos,b57330v2103",
298 .data
= &ntc_thermistor_id
[5]},
299 { .compatible
= "murata,ncp03wf104",
300 .data
= &ntc_thermistor_id
[6] },
301 { .compatible
= "murata,ncp15xh103",
302 .data
= &ntc_thermistor_id
[7] },
304 /* Usage of vendor name "ntc" is deprecated */
305 { .compatible
= "ntc,ncp15wb473",
306 .data
= &ntc_thermistor_id
[0] },
307 { .compatible
= "ntc,ncp18wb473",
308 .data
= &ntc_thermistor_id
[1] },
309 { .compatible
= "ntc,ncp21wb473",
310 .data
= &ntc_thermistor_id
[2] },
311 { .compatible
= "ntc,ncp03wb473",
312 .data
= &ntc_thermistor_id
[3] },
313 { .compatible
= "ntc,ncp15wl333",
314 .data
= &ntc_thermistor_id
[4] },
317 MODULE_DEVICE_TABLE(of
, ntc_match
);
319 static struct ntc_thermistor_platform_data
*
320 ntc_thermistor_parse_dt(struct platform_device
*pdev
)
322 struct iio_channel
*chan
;
323 enum iio_chan_type type
;
324 struct device_node
*np
= pdev
->dev
.of_node
;
325 struct ntc_thermistor_platform_data
*pdata
;
331 pdata
= devm_kzalloc(&pdev
->dev
, sizeof(*pdata
), GFP_KERNEL
);
333 return ERR_PTR(-ENOMEM
);
335 chan
= iio_channel_get(&pdev
->dev
, NULL
);
337 return ERR_CAST(chan
);
339 ret
= iio_get_channel_type(chan
, &type
);
343 if (type
!= IIO_VOLTAGE
)
344 return ERR_PTR(-EINVAL
);
346 if (of_property_read_u32(np
, "pullup-uv", &pdata
->pullup_uv
))
347 return ERR_PTR(-ENODEV
);
348 if (of_property_read_u32(np
, "pullup-ohm", &pdata
->pullup_ohm
))
349 return ERR_PTR(-ENODEV
);
350 if (of_property_read_u32(np
, "pulldown-ohm", &pdata
->pulldown_ohm
))
351 return ERR_PTR(-ENODEV
);
353 if (of_find_property(np
, "connected-positive", NULL
))
354 pdata
->connect
= NTC_CONNECTED_POSITIVE
;
355 else /* status change should be possible if not always on. */
356 pdata
->connect
= NTC_CONNECTED_GROUND
;
359 pdata
->read_uv
= ntc_adc_iio_read
;
363 static void ntc_iio_channel_release(struct ntc_thermistor_platform_data
*pdata
)
366 iio_channel_release(pdata
->chan
);
369 static struct ntc_thermistor_platform_data
*
370 ntc_thermistor_parse_dt(struct platform_device
*pdev
)
375 #define ntc_match NULL
377 static void ntc_iio_channel_release(struct ntc_thermistor_platform_data
*pdata
)
381 static inline u64
div64_u64_safe(u64 dividend
, u64 divisor
)
383 if (divisor
== 0 && dividend
== 0)
387 return div64_u64(dividend
, divisor
);
390 static int get_ohm_of_thermistor(struct ntc_data
*data
, unsigned int uv
)
392 struct ntc_thermistor_platform_data
*pdata
= data
->pdata
;
393 u32 puv
= pdata
->pullup_uv
;
395 puo
= pdata
->pullup_ohm
;
396 pdo
= pdata
->pulldown_ohm
;
399 return (pdata
->connect
== NTC_CONNECTED_POSITIVE
) ?
402 return (pdata
->connect
== NTC_CONNECTED_POSITIVE
) ?
405 if (pdata
->connect
== NTC_CONNECTED_POSITIVE
&& puo
== 0)
406 n
= div_u64(pdo
* (puv
- uv
), uv
);
407 else if (pdata
->connect
== NTC_CONNECTED_GROUND
&& pdo
== 0)
408 n
= div_u64(puo
* uv
, puv
- uv
);
409 else if (pdata
->connect
== NTC_CONNECTED_POSITIVE
)
410 n
= div64_u64_safe(pdo
* puo
* (puv
- uv
),
411 puo
* uv
- pdo
* (puv
- uv
));
413 n
= div64_u64_safe(pdo
* puo
* uv
, pdo
* (puv
- uv
) - puo
* uv
);
420 static void lookup_comp(struct ntc_data
*data
, unsigned int ohm
,
421 int *i_low
, int *i_high
)
426 * Handle special cases: Resistance is higher than or equal to
427 * resistance in first table entry, or resistance is lower or equal
428 * to resistance in last table entry.
429 * In these cases, return i_low == i_high, either pointing to the
430 * beginning or to the end of the table depending on the condition.
432 if (ohm
>= data
->comp
[0].ohm
) {
437 if (ohm
<= data
->comp
[data
->n_comp
- 1].ohm
) {
438 *i_low
= data
->n_comp
- 1;
439 *i_high
= data
->n_comp
- 1;
443 /* Do a binary search on compensation table */
446 while (start
< end
) {
447 mid
= start
+ (end
- start
) / 2;
450 * data->comp[start].ohm > ohm >= data->comp[end].ohm
452 * We could check for "ohm == data->comp[mid].ohm" here, but
453 * that is a quite unlikely condition, and we would have to
454 * check again after updating start. Check it at the end instead
457 if (ohm
>= data
->comp
[mid
].ohm
) {
462 * ohm >= data->comp[start].ohm might be true here,
463 * since we set start to mid + 1. In that case, we are
464 * done. We could keep going, but the condition is quite
465 * likely to occur, so it is worth checking for it.
467 if (ohm
>= data
->comp
[start
].ohm
)
472 * data->comp[start].ohm >= ohm >= data->comp[end].ohm
477 * ohm >= data->comp[end].ohm
480 if (ohm
== data
->comp
[end
].ohm
)
486 static int get_temp_mc(struct ntc_data
*data
, unsigned int ohm
)
491 lookup_comp(data
, ohm
, &low
, &high
);
493 /* Unable to use linear approximation */
494 temp
= data
->comp
[low
].temp_c
* 1000;
496 temp
= data
->comp
[low
].temp_c
* 1000 +
497 ((data
->comp
[high
].temp_c
- data
->comp
[low
].temp_c
) *
498 1000 * ((int)ohm
- (int)data
->comp
[low
].ohm
)) /
499 ((int)data
->comp
[high
].ohm
- (int)data
->comp
[low
].ohm
);
504 static int ntc_thermistor_get_ohm(struct ntc_data
*data
)
508 if (data
->pdata
->read_ohm
)
509 return data
->pdata
->read_ohm();
511 if (data
->pdata
->read_uv
) {
512 read_uv
= data
->pdata
->read_uv(data
->pdata
);
515 return get_ohm_of_thermistor(data
, read_uv
);
520 static int ntc_read_temp(void *dev
, int *temp
)
522 struct ntc_data
*data
= dev_get_drvdata(dev
);
525 ohm
= ntc_thermistor_get_ohm(data
);
529 *temp
= get_temp_mc(data
, ohm
);
534 static ssize_t
ntc_show_name(struct device
*dev
,
535 struct device_attribute
*attr
, char *buf
)
537 struct ntc_data
*data
= dev_get_drvdata(dev
);
539 return sprintf(buf
, "%s\n", data
->name
);
542 static ssize_t
ntc_show_type(struct device
*dev
,
543 struct device_attribute
*attr
, char *buf
)
545 return sprintf(buf
, "4\n");
548 static ssize_t
ntc_show_temp(struct device
*dev
,
549 struct device_attribute
*attr
, char *buf
)
551 struct ntc_data
*data
= dev_get_drvdata(dev
);
554 ohm
= ntc_thermistor_get_ohm(data
);
558 return sprintf(buf
, "%d\n", get_temp_mc(data
, ohm
));
561 static SENSOR_DEVICE_ATTR(temp1_type
, S_IRUGO
, ntc_show_type
, NULL
, 0);
562 static SENSOR_DEVICE_ATTR(temp1_input
, S_IRUGO
, ntc_show_temp
, NULL
, 0);
563 static DEVICE_ATTR(name
, S_IRUGO
, ntc_show_name
, NULL
);
565 static struct attribute
*ntc_attributes
[] = {
567 &sensor_dev_attr_temp1_type
.dev_attr
.attr
,
568 &sensor_dev_attr_temp1_input
.dev_attr
.attr
,
572 static const struct attribute_group ntc_attr_group
= {
573 .attrs
= ntc_attributes
,
576 static const struct thermal_zone_of_device_ops ntc_of_thermal_ops
= {
577 .get_temp
= ntc_read_temp
,
580 static int ntc_thermistor_probe(struct platform_device
*pdev
)
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
;
586 struct ntc_data
*data
;
589 pdata
= ntc_thermistor_parse_dt(pdev
);
591 return PTR_ERR(pdata
);
592 else if (pdata
== NULL
)
593 pdata
= dev_get_platdata(&pdev
->dev
);
596 dev_err(&pdev
->dev
, "No platform init data supplied.\n");
600 /* Either one of the two is required. */
601 if (!pdata
->read_uv
&& !pdata
->read_ohm
) {
603 "Both read_uv and read_ohm missing. Need either one of the two.\n");
607 if (pdata
->read_uv
&& pdata
->read_ohm
) {
609 "Only one of read_uv and read_ohm is needed; ignoring read_uv.\n");
610 pdata
->read_uv
= NULL
;
613 if (pdata
->read_uv
&& (pdata
->pullup_uv
== 0 ||
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
))) {
621 "Required data to use read_uv not supplied.\n");
625 data
= devm_kzalloc(&pdev
->dev
, sizeof(struct ntc_data
), GFP_KERNEL
);
629 pdev_id
= of_id
? of_id
->data
: platform_get_device_id(pdev
);
631 data
->dev
= &pdev
->dev
;
633 strlcpy(data
->name
, pdev_id
->name
, sizeof(data
->name
));
635 switch (pdev_id
->driver_data
) {
636 case TYPE_NCPXXWB473
:
637 data
->comp
= ncpXXwb473
;
638 data
->n_comp
= ARRAY_SIZE(ncpXXwb473
);
640 case TYPE_NCPXXWL333
:
641 data
->comp
= ncpXXwl333
;
642 data
->n_comp
= ARRAY_SIZE(ncpXXwl333
);
644 case TYPE_B57330V2103
:
645 data
->comp
= b57330v2103
;
646 data
->n_comp
= ARRAY_SIZE(b57330v2103
);
648 case TYPE_NCPXXWF104
:
649 data
->comp
= ncpXXwf104
;
650 data
->n_comp
= ARRAY_SIZE(ncpXXwf104
);
652 case TYPE_NCPXXXH103
:
653 data
->comp
= ncpXXxh103
;
654 data
->n_comp
= ARRAY_SIZE(ncpXXxh103
);
657 dev_err(&pdev
->dev
, "Unknown device type: %lu(%s)\n",
658 pdev_id
->driver_data
, pdev_id
->name
);
662 platform_set_drvdata(pdev
, data
);
664 ret
= sysfs_create_group(&data
->dev
->kobj
, &ntc_attr_group
);
666 dev_err(data
->dev
, "unable to create sysfs files\n");
670 data
->hwmon_dev
= hwmon_device_register(data
->dev
);
671 if (IS_ERR(data
->hwmon_dev
)) {
672 dev_err(data
->dev
, "unable to register as hwmon device.\n");
673 ret
= PTR_ERR(data
->hwmon_dev
);
674 goto err_after_sysfs
;
677 dev_info(&pdev
->dev
, "Thermistor type: %s successfully probed.\n",
680 data
->tz
= thermal_zone_of_sensor_register(data
->dev
, 0, data
->dev
,
681 &ntc_of_thermal_ops
);
682 if (IS_ERR(data
->tz
)) {
683 dev_dbg(&pdev
->dev
, "Failed to register to thermal fw.\n");
689 sysfs_remove_group(&data
->dev
->kobj
, &ntc_attr_group
);
690 ntc_iio_channel_release(pdata
);
694 static int ntc_thermistor_remove(struct platform_device
*pdev
)
696 struct ntc_data
*data
= platform_get_drvdata(pdev
);
697 struct ntc_thermistor_platform_data
*pdata
= data
->pdata
;
699 hwmon_device_unregister(data
->hwmon_dev
);
700 sysfs_remove_group(&data
->dev
->kobj
, &ntc_attr_group
);
701 ntc_iio_channel_release(pdata
);
703 thermal_zone_of_sensor_unregister(data
->dev
, data
->tz
);
708 static struct platform_driver ntc_thermistor_driver
= {
710 .name
= "ntc-thermistor",
711 .of_match_table
= of_match_ptr(ntc_match
),
713 .probe
= ntc_thermistor_probe
,
714 .remove
= ntc_thermistor_remove
,
715 .id_table
= ntc_thermistor_id
,
718 module_platform_driver(ntc_thermistor_driver
);
720 MODULE_DESCRIPTION("NTC Thermistor Driver");
721 MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
722 MODULE_LICENSE("GPL");
723 MODULE_ALIAS("platform:ntc-thermistor");