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2024-05-14 bedbef8ad3e75a304af6361af235302bcc61d06b 
 kernel/drivers/hwmon/hwmon.c
....@@ -1,13 +1,10 @@
1
+// SPDX-License-Identifier: GPL-2.0-only
12 /*
23  * hwmon.c - part of lm_sensors, Linux kernel modules for hardware monitoring
34  *
45  * This file defines the sysfs class "hwmon", for use by sensors drivers.
56  *
67  * Copyright (C) 2005 Mark M. Hoffman <mhoffman@lightlink.com>
7
- *
8
- * This program is free software; you can redistribute it and/or modify
9
- * it under the terms of the GNU General Public License as published by
10
- * the Free Software Foundation; version 2 of the License.
118  */
129 
1310 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
....@@ -18,11 +15,15 @@
1815 #include <linux/gfp.h>
1916 #include <linux/hwmon.h>
2017 #include <linux/idr.h>
18
+#include <linux/list.h>
2119 #include <linux/module.h>
2220 #include <linux/pci.h>
2321 #include <linux/slab.h>
2422 #include <linux/string.h>
2523 #include <linux/thermal.h>
24
+
25
+#define CREATE_TRACE_POINTS
26
+#include <trace/events/hwmon.h>
2627 
2728 #define HWMON_ID_PREFIX "hwmon"
2829 #define HWMON_ID_FORMAT HWMON_ID_PREFIX "%d"
....@@ -31,7 +32,7 @@
3132 	const char *name;
3233 	struct device dev;
3334 	const struct hwmon_chip_info *chip;
34
-
35
+	struct list_head tzdata;
3536 	struct attribute_group group;
3637 	const struct attribute_group **groups;
3738 };
....@@ -55,12 +56,12 @@
5556 
5657 /*
5758  * Thermal zone information
58
- * In addition to the reference to the hwmon device,
59
- * also provides the sensor index.
6059  */
6160 struct hwmon_thermal_data {
61
+	struct list_head node;		/* hwmon tzdata list entry */
6262 	struct device *dev;		/* Reference to hwmon device */
6363 	int index;			/* sensor index */
64
+	struct thermal_zone_device *tzd;/* thermal zone device */
6465 };
6566 
6667 static ssize_t
....@@ -134,9 +135,7 @@
134135  * The complex conditional is necessary to avoid a cyclic dependency
135136  * between hwmon and thermal_sys modules.
136137  */
137
-#if IS_REACHABLE(CONFIG_THERMAL) && defined(CONFIG_THERMAL_OF) && \
138
-	(!defined(CONFIG_THERMAL_HWMON) || \
139
-	 !(defined(MODULE) && IS_MODULE(CONFIG_THERMAL)))
138
+#ifdef CONFIG_THERMAL_OF
140139 static int hwmon_thermal_get_temp(void *data, int *temp)
141140 {
142141 	struct hwmon_thermal_data *tdata = data;
....@@ -158,10 +157,17 @@
158157 	.get_temp = hwmon_thermal_get_temp,
159158 };
160159 
160
+static void hwmon_thermal_remove_sensor(void *data)
161
+{
162
+	list_del(data);
163
+}
164
+
161165 static int hwmon_thermal_add_sensor(struct device *dev, int index)
162166 {
167
+	struct hwmon_device *hwdev = to_hwmon_device(dev);
163168 	struct hwmon_thermal_data *tdata;
164169 	struct thermal_zone_device *tzd;
170
+	int err;
165171 
166172 	tdata = devm_kzalloc(dev, sizeof(*tdata), GFP_KERNEL);
167173 	if (!tdata)
....@@ -172,21 +178,85 @@
172178 
173179 	tzd = devm_thermal_zone_of_sensor_register(dev, index, tdata,
174180 						   &hwmon_thermal_ops);
175
-	/*
176
-	 * If CONFIG_THERMAL_OF is disabled, this returns -ENODEV,
177
-	 * so ignore that error but forward any other error.
178
-	 */
179
-	if (IS_ERR(tzd) && (PTR_ERR(tzd) != -ENODEV))
180
-		return PTR_ERR(tzd);
181
+	if (IS_ERR(tzd)) {
182
+		if (PTR_ERR(tzd) != -ENODEV)
183
+			return PTR_ERR(tzd);
184
+		dev_info(dev, "temp%d_input not attached to any thermal zone\n",
185
+			 index + 1);
186
+		devm_kfree(dev, tdata);
187
+		return 0;
188
+	}
189
+
190
+	err = devm_add_action(dev, hwmon_thermal_remove_sensor, &tdata->node);
191
+	if (err)
192
+		return err;
193
+
194
+	tdata->tzd = tzd;
195
+	list_add(&tdata->node, &hwdev->tzdata);
181196 
182197 	return 0;
183198 }
199
+
200
+static int hwmon_thermal_register_sensors(struct device *dev)
201
+{
202
+	struct hwmon_device *hwdev = to_hwmon_device(dev);
203
+	const struct hwmon_chip_info *chip = hwdev->chip;
204
+	const struct hwmon_channel_info **info = chip->info;
205
+	void *drvdata = dev_get_drvdata(dev);
206
+	int i;
207
+
208
+	for (i = 1; info[i]; i++) {
209
+		int j;
210
+
211
+		if (info[i]->type != hwmon_temp)
212
+			continue;
213
+
214
+		for (j = 0; info[i]->config[j]; j++) {
215
+			int err;
216
+
217
+			if (!(info[i]->config[j] & HWMON_T_INPUT) ||
218
+			    !chip->ops->is_visible(drvdata, hwmon_temp,
219
+						   hwmon_temp_input, j))
220
+				continue;
221
+
222
+			err = hwmon_thermal_add_sensor(dev, j);
223
+			if (err)
224
+				return err;
225
+		}
226
+	}
227
+
228
+	return 0;
229
+}
230
+
231
+static void hwmon_thermal_notify(struct device *dev, int index)
232
+{
233
+	struct hwmon_device *hwdev = to_hwmon_device(dev);
234
+	struct hwmon_thermal_data *tzdata;
235
+
236
+	list_for_each_entry(tzdata, &hwdev->tzdata, node) {
237
+		if (tzdata->index == index) {
238
+			thermal_zone_device_update(tzdata->tzd,
239
+						   THERMAL_EVENT_UNSPECIFIED);
240
+		}
241
+	}
242
+}
243
+
184244 #else
185
-static int hwmon_thermal_add_sensor(struct device *dev, int index)
245
+static int hwmon_thermal_register_sensors(struct device *dev)
186246 {
187247 	return 0;
188248 }
249
+
250
+static void hwmon_thermal_notify(struct device *dev, int index) { }
251
+
189252 #endif /* IS_REACHABLE(CONFIG_THERMAL) && ... */
253
+
254
+static int hwmon_attr_base(enum hwmon_sensor_types type)
255
+{
256
+	if (type == hwmon_in || type == hwmon_intrusion)
257
+		return 0;
258
+	return 1;
259
+}
190260 
191261 /* sysfs attribute management */
192262 
....@@ -202,6 +272,9 @@
202272 	if (ret < 0)
203273 		return ret;
204274 
275
+	trace_hwmon_attr_show(hattr->index + hwmon_attr_base(hattr->type),
276
+			      hattr->name, val);
277
+
205278 	return sprintf(buf, "%ld\n", val);
206279 }
207280 
....@@ -210,6 +283,7 @@
210283 				      char *buf)
211284 {
212285 	struct hwmon_device_attribute *hattr = to_hwmon_attr(devattr);
286
+	enum hwmon_sensor_types type = hattr->type;
213287 	const char *s;
214288 	int ret;
215289 
....@@ -217,6 +291,9 @@
217291 				      hattr->index, &s);
218292 	if (ret < 0)
219293 		return ret;
294
+
295
+	trace_hwmon_attr_show_string(hattr->index + hwmon_attr_base(type),
296
+				     hattr->name, s);
220297 
221298 	return sprintf(buf, "%s\n", s);
222299 }
....@@ -238,14 +315,10 @@
238315 	if (ret < 0)
239316 		return ret;
240317 
241
-	return count;
242
-}
318
+	trace_hwmon_attr_store(hattr->index + hwmon_attr_base(hattr->type),
319
+			       hattr->name, val);
243320 
244
-static int hwmon_attr_base(enum hwmon_sensor_types type)
245
-{
246
-	if (type == hwmon_in)
247
-		return 0;
248
-	return 1;
321
+	return count;
249322 }
250323 
251324 static bool is_string_attr(enum hwmon_sensor_types type, u32 attr)
....@@ -270,7 +343,7 @@
270343 	struct device_attribute *dattr;
271344 	struct attribute *a;
272345 	umode_t mode;
273
-	char *name;
346
+	const char *name;
274347 	bool is_string = is_string_attr(type, attr);
275348 
276349 	/* The attribute is invisible if there is no template string */
....@@ -281,10 +354,10 @@
281354 	if (!mode)
282355 		return ERR_PTR(-ENOENT);
283356 
284
-	if ((mode & S_IRUGO) && ((is_string && !ops->read_string) ||
357
+	if ((mode & 0444) && ((is_string && !ops->read_string) ||
285358 				 (!is_string && !ops->read)))
286359 		return ERR_PTR(-EINVAL);
287
-	if ((mode & S_IWUGO) && !ops->write)
360
+	if ((mode & 0222) && !ops->write)
288361 		return ERR_PTR(-EINVAL);
289362 
290363 	hattr = kzalloc(sizeof(*hattr), GFP_KERNEL);
....@@ -292,7 +365,7 @@
292365 		return ERR_PTR(-ENOMEM);
293366 
294367 	if (type == hwmon_chip) {
295
-		name = (char *)template;
368
+		name = template;
296369 	} else {
297370 		scnprintf(hattr->name, sizeof(hattr->name), template,
298371 			  index + hwmon_attr_base(type));
....@@ -327,9 +400,15 @@
327400 	[hwmon_chip_power_reset_history] = "power_reset_history",
328401 	[hwmon_chip_update_interval] = "update_interval",
329402 	[hwmon_chip_alarms] = "alarms",
403
+	[hwmon_chip_samples] = "samples",
404
+	[hwmon_chip_curr_samples] = "curr_samples",
405
+	[hwmon_chip_in_samples] = "in_samples",
406
+	[hwmon_chip_power_samples] = "power_samples",
407
+	[hwmon_chip_temp_samples] = "temp_samples",
330408 };
331409 
332410 static const char * const hwmon_temp_attr_templates[] = {
411
+	[hwmon_temp_enable] = "temp%d_enable",
333412 	[hwmon_temp_input] = "temp%d_input",
334413 	[hwmon_temp_type] = "temp%d_type",
335414 	[hwmon_temp_lcrit] = "temp%d_lcrit",
....@@ -354,9 +433,12 @@
354433 	[hwmon_temp_lowest] = "temp%d_lowest",
355434 	[hwmon_temp_highest] = "temp%d_highest",
356435 	[hwmon_temp_reset_history] = "temp%d_reset_history",
436
+	[hwmon_temp_rated_min] = "temp%d_rated_min",
437
+	[hwmon_temp_rated_max] = "temp%d_rated_max",
357438 };
358439 
359440 static const char * const hwmon_in_attr_templates[] = {
441
+	[hwmon_in_enable] = "in%d_enable",
360442 	[hwmon_in_input] = "in%d_input",
361443 	[hwmon_in_min] = "in%d_min",
362444 	[hwmon_in_max] = "in%d_max",
....@@ -372,9 +454,12 @@
372454 	[hwmon_in_max_alarm] = "in%d_max_alarm",
373455 	[hwmon_in_lcrit_alarm] = "in%d_lcrit_alarm",
374456 	[hwmon_in_crit_alarm] = "in%d_crit_alarm",
457
+	[hwmon_in_rated_min] = "in%d_rated_min",
458
+	[hwmon_in_rated_max] = "in%d_rated_max",
375459 };
376460 
377461 static const char * const hwmon_curr_attr_templates[] = {
462
+	[hwmon_curr_enable] = "curr%d_enable",
378463 	[hwmon_curr_input] = "curr%d_input",
379464 	[hwmon_curr_min] = "curr%d_min",
380465 	[hwmon_curr_max] = "curr%d_max",
....@@ -390,9 +475,12 @@
390475 	[hwmon_curr_max_alarm] = "curr%d_max_alarm",
391476 	[hwmon_curr_lcrit_alarm] = "curr%d_lcrit_alarm",
392477 	[hwmon_curr_crit_alarm] = "curr%d_crit_alarm",
478
+	[hwmon_curr_rated_min] = "curr%d_rated_min",
479
+	[hwmon_curr_rated_max] = "curr%d_rated_max",
393480 };
394481 
395482 static const char * const hwmon_power_attr_templates[] = {
483
+	[hwmon_power_enable] = "power%d_enable",
396484 	[hwmon_power_average] = "power%d_average",
397485 	[hwmon_power_average_interval] = "power%d_average_interval",
398486 	[hwmon_power_average_interval_max] = "power%d_interval_max",
....@@ -421,14 +509,18 @@
421509 	[hwmon_power_max_alarm] = "power%d_max_alarm",
422510 	[hwmon_power_lcrit_alarm] = "power%d_lcrit_alarm",
423511 	[hwmon_power_crit_alarm] = "power%d_crit_alarm",
512
+	[hwmon_power_rated_min] = "power%d_rated_min",
513
+	[hwmon_power_rated_max] = "power%d_rated_max",
424514 };
425515 
426516 static const char * const hwmon_energy_attr_templates[] = {
517
+	[hwmon_energy_enable] = "energy%d_enable",
427518 	[hwmon_energy_input] = "energy%d_input",
428519 	[hwmon_energy_label] = "energy%d_label",
429520 };
430521 
431522 static const char * const hwmon_humidity_attr_templates[] = {
523
+	[hwmon_humidity_enable] = "humidity%d_enable",
432524 	[hwmon_humidity_input] = "humidity%d_input",
433525 	[hwmon_humidity_label] = "humidity%d_label",
434526 	[hwmon_humidity_min] = "humidity%d_min",
....@@ -437,9 +529,12 @@
437529 	[hwmon_humidity_max_hyst] = "humidity%d_max_hyst",
438530 	[hwmon_humidity_alarm] = "humidity%d_alarm",
439531 	[hwmon_humidity_fault] = "humidity%d_fault",
532
+	[hwmon_humidity_rated_min] = "humidity%d_rated_min",
533
+	[hwmon_humidity_rated_max] = "humidity%d_rated_max",
440534 };
441535 
442536 static const char * const hwmon_fan_attr_templates[] = {
537
+	[hwmon_fan_enable] = "fan%d_enable",
443538 	[hwmon_fan_input] = "fan%d_input",
444539 	[hwmon_fan_label] = "fan%d_label",
445540 	[hwmon_fan_min] = "fan%d_min",
....@@ -460,6 +555,11 @@
460555 	[hwmon_pwm_freq] = "pwm%d_freq",
461556 };
462557 
558
+static const char * const hwmon_intrusion_attr_templates[] = {
559
+	[hwmon_intrusion_alarm] = "intrusion%d_alarm",
560
+	[hwmon_intrusion_beep]  = "intrusion%d_beep",
561
+};
562
+
463563 static const char * const *__templates[] = {
464564 	[hwmon_chip] = hwmon_chip_attrs,
465565 	[hwmon_temp] = hwmon_temp_attr_templates,
....@@ -470,6 +570,7 @@
470570 	[hwmon_humidity] = hwmon_humidity_attr_templates,
471571 	[hwmon_fan] = hwmon_fan_attr_templates,
472572 	[hwmon_pwm] = hwmon_pwm_attr_templates,
573
+	[hwmon_intrusion] = hwmon_intrusion_attr_templates,
473574 };
474575 
475576 static const int __templates_size[] = {
....@@ -482,7 +583,37 @@
482583 	[hwmon_humidity] = ARRAY_SIZE(hwmon_humidity_attr_templates),
483584 	[hwmon_fan] = ARRAY_SIZE(hwmon_fan_attr_templates),
484585 	[hwmon_pwm] = ARRAY_SIZE(hwmon_pwm_attr_templates),
586
+	[hwmon_intrusion] = ARRAY_SIZE(hwmon_intrusion_attr_templates),
485587 };
588
+
589
+int hwmon_notify_event(struct device *dev, enum hwmon_sensor_types type,
590
+		       u32 attr, int channel)
591
+{
592
+	char sattr[MAX_SYSFS_ATTR_NAME_LENGTH];
593
+	const char * const *templates;
594
+	const char *template;
595
+	int base;
596
+
597
+	if (type >= ARRAY_SIZE(__templates))
598
+		return -EINVAL;
599
+	if (attr >= __templates_size[type])
600
+		return -EINVAL;
601
+
602
+	templates = __templates[type];
603
+	template = templates[attr];
604
+
605
+	base = hwmon_attr_base(type);
606
+
607
+	scnprintf(sattr, MAX_SYSFS_ATTR_NAME_LENGTH, template, base + channel);
608
+	sysfs_notify(&dev->kobj, NULL, sattr);
609
+	kobject_uevent(&dev->kobj, KOBJ_CHANGE);
610
+
611
+	if (type == hwmon_temp)
612
+		hwmon_thermal_notify(dev, channel);
613
+
614
+	return 0;
615
+}
616
+EXPORT_SYMBOL_GPL(hwmon_notify_event);
486617 
487618 static int hwmon_num_channel_attrs(const struct hwmon_channel_info *info)
488619 {
....@@ -569,7 +700,8 @@
569700 {
570701 	struct hwmon_device *hwdev;
571702 	struct device *hdev;
572
-	int i, j, err, id;
703
+	struct device *tdev = dev;
704
+	int i, err, id;
573705 
574706 	/* Complain about invalid characters in hwmon name attribute */
575707 	if (name && (!strlen(name) || strpbrk(name, "-* \t\n")))
....@@ -626,7 +758,9 @@
626758 	hwdev->name = name;
627759 	hdev->class = &hwmon_class;
628760 	hdev->parent = dev;
629
-	hdev->of_node = dev ? dev->of_node : NULL;
761
+	while (tdev && !tdev->of_node)
762
+		tdev = tdev->parent;
763
+	hdev->of_node = tdev ? tdev->of_node : NULL;
630764 	hwdev->chip = chip;
631765 	dev_set_drvdata(hdev, drvdata);
632766 	dev_set_name(hdev, HWMON_ID_FORMAT, id);
....@@ -636,27 +770,19 @@
636770 		goto ida_remove;
637771 	}
638772 
639
-	if (dev && dev->of_node && chip && chip->ops->read &&
773
+	INIT_LIST_HEAD(&hwdev->tzdata);
774
+
775
+	if (hdev->of_node && chip && chip->ops->read &&
640776 	    chip->info[0]->type == hwmon_chip &&
641777 	    (chip->info[0]->config[0] & HWMON_C_REGISTER_TZ)) {
642
-		const struct hwmon_channel_info **info = chip->info;
643
-
644
-		for (i = 1; info[i]; i++) {
645
-			if (info[i]->type != hwmon_temp)
646
-				continue;
647
-
648
-			for (j = 0; info[i]->config[j]; j++) {
649
-				if (!chip->ops->is_visible(drvdata, hwmon_temp,
650
-							   hwmon_temp_input, j))
651
-					continue;
652
-				if (info[i]->config[j] & HWMON_T_INPUT) {
653
-					err = hwmon_thermal_add_sensor(hdev, j);
654
-					if (err) {
655
-						device_unregister(hdev);
656
-						goto ida_remove;
657
-					}
658
-				}
659
-			}
778
+		err = hwmon_thermal_register_sensors(hdev);
779
+		if (err) {
780
+			device_unregister(hdev);
781
+			/*
782
+			 * Don't worry about hwdev; hwmon_dev_release(), called
783
+			 * from device_unregister(), will free it.
784
+			 */
785
+			goto ida_remove;
660786 		}
661787 	}
662788