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2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c 
 kernel/drivers/hwmon/ntc_thermistor.c
....@@ -1,23 +1,9 @@
1
+// SPDX-License-Identifier: GPL-2.0-or-later
12 /*
23  * ntc_thermistor.c - NTC Thermistors
34  *
45  *  Copyright (C) 2010 Samsung Electronics
56  *  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
- *
217  */
228 
239 #include <linux/slab.h>
....@@ -37,25 +23,40 @@
3723 #include <linux/iio/consumer.h>
3824 
3925 #include <linux/hwmon.h>
40
-#include <linux/hwmon-sysfs.h>
41
-#include <linux/thermal.h>
4226 
4327 struct ntc_compensation {
4428 	int		temp_c;
4529 	unsigned int	ohm;
4630 };
4731 
48
-/* Order matters, ntc_match references the entries by index */
32
+/*
33
+ * Used as index in a zero-terminated array, holes not allowed so
34
+ * that NTC_LAST is the first empty array entry.
35
+ */
36
+enum {
37
+	NTC_B57330V2103,
38
+	NTC_B57891S0103,
39
+	NTC_NCP03WB473,
40
+	NTC_NCP03WF104,
41
+	NTC_NCP15WB473,
42
+	NTC_NCP15WL333,
43
+	NTC_NCP15XH103,
44
+	NTC_NCP18WB473,
45
+	NTC_NCP21WB473,
46
+	NTC_LAST,
47
+};
48
+
4949 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 },
58
-	{ },
50
+	[NTC_B57330V2103]     = { "b57330v2103",     TYPE_B57330V2103 },
51
+	[NTC_B57891S0103]     = { "b57891s0103",     TYPE_B57891S0103 },
52
+	[NTC_NCP03WB473]      = { "ncp03wb473",      TYPE_NCPXXWB473 },
53
+	[NTC_NCP03WF104]      = { "ncp03wf104",      TYPE_NCPXXWF104 },
54
+	[NTC_NCP15WB473]      = { "ncp15wb473",      TYPE_NCPXXWB473 },
55
+	[NTC_NCP15WL333]      = { "ncp15wl333",      TYPE_NCPXXWL333 },
56
+	[NTC_NCP15XH103]      = { "ncp15xh103",      TYPE_NCPXXXH103 },
57
+	[NTC_NCP18WB473]      = { "ncp18wb473",      TYPE_NCPXXWB473 },
58
+	[NTC_NCP21WB473]      = { "ncp21wb473",      TYPE_NCPXXWB473 },
59
+	[NTC_LAST]            = { },
5960 };
6061 
6162 /*
....@@ -212,8 +213,8 @@
212213 };
213214 
214215 /*
215
- * The following compensation table is from the specification of EPCOS NTC
216
- * Thermistors Datasheet
216
+ * The following compensation tables are from the specifications in EPCOS NTC
217
+ * Thermistors Datasheets
217218  */
218219 static const struct ntc_compensation b57330v2103[] = {
219220 	{ .temp_c	= -40, .ohm	= 190030 },
....@@ -252,6 +253,69 @@
252253 	{ .temp_c	= 125, .ohm	= 531 },
253254 };
254255 
256
+static const struct ntc_compensation b57891s0103[] = {
257
+	{ .temp_c	= -55.0, .ohm	= 878900 },
258
+	{ .temp_c	= -50.0, .ohm	= 617590 },
259
+	{ .temp_c	= -45.0, .ohm	= 439340 },
260
+	{ .temp_c	= -40.0, .ohm	= 316180 },
261
+	{ .temp_c	= -35.0, .ohm	= 230060 },
262
+	{ .temp_c	= -30.0, .ohm	= 169150 },
263
+	{ .temp_c	= -25.0, .ohm	= 125550 },
264
+	{ .temp_c	= -20.0, .ohm	= 94143 },
265
+	{ .temp_c	= -15.0, .ohm	= 71172 },
266
+	{ .temp_c	= -10.0, .ohm	= 54308 },
267
+	{ .temp_c	= -5.0, .ohm	= 41505 },
268
+	{ .temp_c	= 0.0, .ohm	= 32014 },
269
+	{ .temp_c	= 5.0, .ohm	= 25011 },
270
+	{ .temp_c	= 10.0, .ohm	= 19691 },
271
+	{ .temp_c	= 15.0, .ohm	= 15618 },
272
+	{ .temp_c	= 20.0, .ohm	= 12474 },
273
+	{ .temp_c	= 25.0, .ohm	= 10000 },
274
+	{ .temp_c	= 30.0, .ohm	= 8080 },
275
+	{ .temp_c	= 35.0, .ohm	= 6569 },
276
+	{ .temp_c	= 40.0, .ohm	= 5372 },
277
+	{ .temp_c	= 45.0, .ohm	= 4424 },
278
+	{ .temp_c	= 50.0, .ohm	= 3661 },
279
+	{ .temp_c	= 55.0, .ohm	= 3039 },
280
+	{ .temp_c	= 60.0, .ohm	= 2536 },
281
+	{ .temp_c	= 65.0, .ohm	= 2128 },
282
+	{ .temp_c	= 70.0, .ohm	= 1794 },
283
+	{ .temp_c	= 75.0, .ohm	= 1518 },
284
+	{ .temp_c	= 80.0, .ohm	= 1290 },
285
+	{ .temp_c	= 85.0, .ohm	= 1100 },
286
+	{ .temp_c	= 90.0, .ohm	= 942 },
287
+	{ .temp_c	= 95.0, .ohm	= 809 },
288
+	{ .temp_c	= 100.0, .ohm	= 697 },
289
+	{ .temp_c	= 105.0, .ohm	= 604 },
290
+	{ .temp_c	= 110.0, .ohm	= 525 },
291
+	{ .temp_c	= 115.0, .ohm	= 457 },
292
+	{ .temp_c	= 120.0, .ohm	= 400 },
293
+	{ .temp_c	= 125.0, .ohm	= 351 },
294
+	{ .temp_c	= 130.0, .ohm	= 308 },
295
+	{ .temp_c	= 135.0, .ohm	= 272 },
296
+	{ .temp_c	= 140.0, .ohm	= 240 },
297
+	{ .temp_c	= 145.0, .ohm	= 213 },
298
+	{ .temp_c	= 150.0, .ohm	= 189 },
299
+	{ .temp_c	= 155.0, .ohm	= 168 },
300
+};
301
+
302
+struct ntc_type {
303
+	const struct ntc_compensation *comp;
304
+	int n_comp;
305
+};
306
+
307
+#define NTC_TYPE(ntc, compensation) \
308
+[(ntc)] = { .comp = (compensation), .n_comp = ARRAY_SIZE(compensation) }
309
+
310
+static const struct ntc_type ntc_type[] = {
311
+	NTC_TYPE(TYPE_B57330V2103, b57330v2103),
312
+	NTC_TYPE(TYPE_B57891S0103, b57891s0103),
313
+	NTC_TYPE(TYPE_NCPXXWB473,  ncpXXwb473),
314
+	NTC_TYPE(TYPE_NCPXXWF104,  ncpXXwf104),
315
+	NTC_TYPE(TYPE_NCPXXWL333,  ncpXXwl333),
316
+	NTC_TYPE(TYPE_NCPXXXH103,  ncpXXxh103),
317
+};
318
+
255319 struct ntc_data {
256320 	struct ntc_thermistor_platform_data *pdata;
257321 	const struct ntc_compensation *comp;
....@@ -280,34 +344,36 @@
280344 }
281345 
282346 static const struct of_device_id ntc_match[] = {
283
-	{ .compatible = "murata,ncp15wb473",
284
-		.data = &ntc_thermistor_id[0] },
285
-	{ .compatible = "murata,ncp18wb473",
286
-		.data = &ntc_thermistor_id[1] },
287
-	{ .compatible = "murata,ncp21wb473",
288
-		.data = &ntc_thermistor_id[2] },
289
-	{ .compatible = "murata,ncp03wb473",
290
-		.data = &ntc_thermistor_id[3] },
291
-	{ .compatible = "murata,ncp15wl333",
292
-		.data = &ntc_thermistor_id[4] },
293347 	{ .compatible = "epcos,b57330v2103",
294
-		.data = &ntc_thermistor_id[5]},
348
+		.data = &ntc_thermistor_id[NTC_B57330V2103]},
349
+	{ .compatible = "epcos,b57891s0103",
350
+		.data = &ntc_thermistor_id[NTC_B57891S0103] },
351
+	{ .compatible = "murata,ncp03wb473",
352
+		.data = &ntc_thermistor_id[NTC_NCP03WB473] },
295353 	{ .compatible = "murata,ncp03wf104",
296
-		.data = &ntc_thermistor_id[6] },
354
+		.data = &ntc_thermistor_id[NTC_NCP03WF104] },
355
+	{ .compatible = "murata,ncp15wb473",
356
+		.data = &ntc_thermistor_id[NTC_NCP15WB473] },
357
+	{ .compatible = "murata,ncp15wl333",
358
+		.data = &ntc_thermistor_id[NTC_NCP15WL333] },
297359 	{ .compatible = "murata,ncp15xh103",
298
-		.data = &ntc_thermistor_id[7] },
360
+		.data = &ntc_thermistor_id[NTC_NCP15XH103] },
361
+	{ .compatible = "murata,ncp18wb473",
362
+		.data = &ntc_thermistor_id[NTC_NCP18WB473] },
363
+	{ .compatible = "murata,ncp21wb473",
364
+		.data = &ntc_thermistor_id[NTC_NCP21WB473] },
299365 
300366 	/* Usage of vendor name "ntc" is deprecated */
301
-	{ .compatible = "ntc,ncp15wb473",
302
-		.data = &ntc_thermistor_id[0] },
303
-	{ .compatible = "ntc,ncp18wb473",
304
-		.data = &ntc_thermistor_id[1] },
305
-	{ .compatible = "ntc,ncp21wb473",
306
-		.data = &ntc_thermistor_id[2] },
307367 	{ .compatible = "ntc,ncp03wb473",
308
-		.data = &ntc_thermistor_id[3] },
368
+		.data = &ntc_thermistor_id[NTC_NCP03WB473] },
369
+	{ .compatible = "ntc,ncp15wb473",
370
+		.data = &ntc_thermistor_id[NTC_NCP15WB473] },
309371 	{ .compatible = "ntc,ncp15wl333",
310
-		.data = &ntc_thermistor_id[4] },
372
+		.data = &ntc_thermistor_id[NTC_NCP15WL333] },
373
+	{ .compatible = "ntc,ncp18wb473",
374
+		.data = &ntc_thermistor_id[NTC_NCP18WB473] },
375
+	{ .compatible = "ntc,ncp21wb473",
376
+		.data = &ntc_thermistor_id[NTC_NCP21WB473] },
311377 	{ },
312378 };
313379 MODULE_DEVICE_TABLE(of, ntc_match);
....@@ -506,55 +572,67 @@
506572 	return -EINVAL;
507573 }
508574 
509
-static int ntc_read_temp(void *data, int *temp)
510
-{
511
-	int ohm;
512
-
513
-	ohm = ntc_thermistor_get_ohm(data);
514
-	if (ohm < 0)
515
-		return ohm;
516
-
517
-	*temp = get_temp_mc(data, ohm);
518
-
519
-	return 0;
520
-}
521
-
522
-static ssize_t ntc_show_type(struct device *dev,
523
-		struct device_attribute *attr, char *buf)
524
-{
525
-	return sprintf(buf, "4\n");
526
-}
527
-
528
-static ssize_t ntc_show_temp(struct device *dev,
529
-		struct device_attribute *attr, char *buf)
575
+static int ntc_read(struct device *dev, enum hwmon_sensor_types type,
576
+		    u32 attr, int channel, long *val)
530577 {
531578 	struct ntc_data *data = dev_get_drvdata(dev);
532579 	int ohm;
533580 
534
-	ohm = ntc_thermistor_get_ohm(data);
535
-	if (ohm < 0)
536
-		return ohm;
537
-
538
-	return sprintf(buf, "%d\n", get_temp_mc(data, ohm));
581
+	switch (type) {
582
+	case hwmon_temp:
583
+		switch (attr) {
584
+		case hwmon_temp_input:
585
+			ohm = ntc_thermistor_get_ohm(data);
586
+			if (ohm < 0)
587
+				return ohm;
588
+			*val = get_temp_mc(data, ohm);
589
+			return 0;
590
+		case hwmon_temp_type:
591
+			*val = 4;
592
+			return 0;
593
+		default:
594
+			break;
595
+		}
596
+		break;
597
+	default:
598
+		break;
599
+	}
600
+	return -EINVAL;
539601 }
540602 
541
-static SENSOR_DEVICE_ATTR(temp1_type, S_IRUGO, ntc_show_type, NULL, 0);
542
-static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, ntc_show_temp, NULL, 0);
603
+static umode_t ntc_is_visible(const void *data, enum hwmon_sensor_types type,
604
+			      u32 attr, int channel)
605
+{
606
+	if (type == hwmon_temp) {
607
+		switch (attr) {
608
+		case hwmon_temp_input:
609
+		case hwmon_temp_type:
610
+			return 0444;
611
+		default:
612
+			break;
613
+		}
614
+	}
615
+	return 0;
616
+}
543617 
544
-static struct attribute *ntc_attrs[] = {
545
-	&sensor_dev_attr_temp1_type.dev_attr.attr,
546
-	&sensor_dev_attr_temp1_input.dev_attr.attr,
547
-	NULL,
618
+static const struct hwmon_channel_info *ntc_info[] = {
619
+	HWMON_CHANNEL_INFO(chip, HWMON_C_REGISTER_TZ),
620
+	HWMON_CHANNEL_INFO(temp, HWMON_T_INPUT | HWMON_T_TYPE),
621
+	NULL
548622 };
549
-ATTRIBUTE_GROUPS(ntc);
550623 
551
-static const struct thermal_zone_of_device_ops ntc_of_thermal_ops = {
552
-	.get_temp = ntc_read_temp,
624
+static const struct hwmon_ops ntc_hwmon_ops = {
625
+	.is_visible = ntc_is_visible,
626
+	.read = ntc_read,
627
+};
628
+
629
+static const struct hwmon_chip_info ntc_chip_info = {
630
+	.ops = &ntc_hwmon_ops,
631
+	.info = ntc_info,
553632 };
554633 
555634 static int ntc_thermistor_probe(struct platform_device *pdev)
556635 {
557
-	struct thermal_zone_device *tz;
558636 	struct device *dev = &pdev->dev;
559637 	const struct of_device_id *of_id =
560638 			of_match_device(of_match_ptr(ntc_match), dev);
....@@ -606,35 +684,18 @@
606684 
607685 	data->pdata = pdata;
608686 
609
-	switch (pdev_id->driver_data) {
610
-	case TYPE_NCPXXWB473:
611
-		data->comp = ncpXXwb473;
612
-		data->n_comp = ARRAY_SIZE(ncpXXwb473);
613
-		break;
614
-	case TYPE_NCPXXWL333:
615
-		data->comp = ncpXXwl333;
616
-		data->n_comp = ARRAY_SIZE(ncpXXwl333);
617
-		break;
618
-	case TYPE_B57330V2103:
619
-		data->comp = b57330v2103;
620
-		data->n_comp = ARRAY_SIZE(b57330v2103);
621
-		break;
622
-	case TYPE_NCPXXWF104:
623
-		data->comp = ncpXXwf104;
624
-		data->n_comp = ARRAY_SIZE(ncpXXwf104);
625
-		break;
626
-	case TYPE_NCPXXXH103:
627
-		data->comp = ncpXXxh103;
628
-		data->n_comp = ARRAY_SIZE(ncpXXxh103);
629
-		break;
630
-	default:
687
+	if (pdev_id->driver_data >= ARRAY_SIZE(ntc_type)) {
631688 		dev_err(dev, "Unknown device type: %lu(%s)\n",
632689 				pdev_id->driver_data, pdev_id->name);
633690 		return -EINVAL;
634691 	}
635692 
636
-	hwmon_dev = devm_hwmon_device_register_with_groups(dev, pdev_id->name,
637
-							   data, ntc_groups);
693
+	data->comp   = ntc_type[pdev_id->driver_data].comp;
694
+	data->n_comp = ntc_type[pdev_id->driver_data].n_comp;
695
+
696
+	hwmon_dev = devm_hwmon_device_register_with_info(dev, pdev_id->name,
697
+							 data, &ntc_chip_info,
698
+							 NULL);
638699 	if (IS_ERR(hwmon_dev)) {
639700 		dev_err(dev, "unable to register as hwmon device.\n");
640701 		return PTR_ERR(hwmon_dev);
....@@ -642,11 +703,6 @@
642703 
643704 	dev_info(dev, "Thermistor type: %s successfully probed.\n",
644705 		 pdev_id->name);
645
-
646
-	tz = devm_thermal_zone_of_sensor_register(dev, 0, data,
647
-						  &ntc_of_thermal_ops);
648
-	if (IS_ERR(tz))
649
-		dev_dbg(dev, "Failed to register to thermal fw.\n");
650706 
651707 	return 0;
652708 }