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2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c 
 kernel/drivers/acpi/button.c
....@@ -1,22 +1,9 @@
1
+// SPDX-License-Identifier: GPL-2.0-or-later
12 /*
23  *  button.c - ACPI Button Driver
34  *
45  *  Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
56  *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
6
- *
7
- * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
8
- *
9
- *  This program is free software; you can redistribute it and/or modify
10
- *  it under the terms of the GNU General Public License as published by
11
- *  the Free Software Foundation; either version 2 of the License, or (at
12
- *  your option) any later version.
13
- *
14
- *  This program is distributed in the hope that it will be useful, but
15
- *  WITHOUT ANY WARRANTY; without even the implied warranty of
16
- *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
17
- *  General Public License for more details.
18
- *
19
- * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
207  */
218 
229 #define pr_fmt(fmt) "ACPI: button: " fmt
....@@ -37,29 +24,35 @@
3724 #define PREFIX "ACPI: "
3825 
3926 #define ACPI_BUTTON_CLASS		"button"
40
-#define ACPI_BUTTON_FILE_INFO		"info"
4127 #define ACPI_BUTTON_FILE_STATE		"state"
4228 #define ACPI_BUTTON_TYPE_UNKNOWN	0x00
4329 #define ACPI_BUTTON_NOTIFY_STATUS	0x80
4430 
4531 #define ACPI_BUTTON_SUBCLASS_POWER	"power"
46
-#define ACPI_BUTTON_HID_POWER		"PNP0C0C"
4732 #define ACPI_BUTTON_DEVICE_NAME_POWER	"Power Button"
4833 #define ACPI_BUTTON_TYPE_POWER		0x01
4934 
5035 #define ACPI_BUTTON_SUBCLASS_SLEEP	"sleep"
51
-#define ACPI_BUTTON_HID_SLEEP		"PNP0C0E"
5236 #define ACPI_BUTTON_DEVICE_NAME_SLEEP	"Sleep Button"
5337 #define ACPI_BUTTON_TYPE_SLEEP		0x03
5438 
5539 #define ACPI_BUTTON_SUBCLASS_LID	"lid"
56
-#define ACPI_BUTTON_HID_LID		"PNP0C0D"
5740 #define ACPI_BUTTON_DEVICE_NAME_LID	"Lid Switch"
5841 #define ACPI_BUTTON_TYPE_LID		0x05
5942 
60
-#define ACPI_BUTTON_LID_INIT_IGNORE	0x00
61
-#define ACPI_BUTTON_LID_INIT_OPEN	0x01
62
-#define ACPI_BUTTON_LID_INIT_METHOD	0x02
43
+enum {
44
+	ACPI_BUTTON_LID_INIT_IGNORE,
45
+	ACPI_BUTTON_LID_INIT_OPEN,
46
+	ACPI_BUTTON_LID_INIT_METHOD,
47
+	ACPI_BUTTON_LID_INIT_DISABLED,
48
+};
49
+
50
+static const char * const lid_init_state_str[] = {
51
+	[ACPI_BUTTON_LID_INIT_IGNORE]		= "ignore",
52
+	[ACPI_BUTTON_LID_INIT_OPEN]		= "open",
53
+	[ACPI_BUTTON_LID_INIT_METHOD]		= "method",
54
+	[ACPI_BUTTON_LID_INIT_DISABLED]		= "disabled",
55
+};
6356 
6457 #define _COMPONENT		ACPI_BUTTON_COMPONENT
6558 ACPI_MODULE_NAME("button");
....@@ -78,18 +71,25 @@
7871 };
7972 MODULE_DEVICE_TABLE(acpi, button_device_ids);
8073 
81
-/*
82
- * Some devices which don't even have a lid in anyway have a broken _LID
83
- * method (e.g. pointing to a floating gpio pin) causing spurious LID events.
84
- */
85
-static const struct dmi_system_id lid_blacklst[] = {
74
+/* Please keep this list sorted alphabetically by vendor and model */
75
+static const struct dmi_system_id dmi_lid_quirks[] = {
8676 	{
87
-		/* GP-electronic T701 */
77
+		/* GP-electronic T701, _LID method points to a floating GPIO */
8878 		.matches = {
8979 			DMI_MATCH(DMI_SYS_VENDOR, "Insyde"),
9080 			DMI_MATCH(DMI_PRODUCT_NAME, "T701"),
9181 			DMI_MATCH(DMI_BIOS_VERSION, "BYT70A.YNCHENG.WIN.007"),
9282 		},
83
+		.driver_data = (void *)(long)ACPI_BUTTON_LID_INIT_DISABLED,
84
+	},
85
+	{
86
+		/* Nextbook Ares 8A tablet, _LID device always reports lid closed */
87
+		.matches = {
88
+			DMI_MATCH(DMI_SYS_VENDOR, "Insyde"),
89
+			DMI_MATCH(DMI_PRODUCT_NAME, "CherryTrail"),
90
+			DMI_MATCH(DMI_BIOS_VERSION, "M882"),
91
+		},
92
+		.driver_data = (void *)(long)ACPI_BUTTON_LID_INIT_DISABLED,
9393 	},
9494 	{
9595 		/*
....@@ -163,9 +163,8 @@
163163 	bool lid_state_initialized;
164164 };
165165 
166
-static BLOCKING_NOTIFIER_HEAD(acpi_lid_notifier);
167166 static struct acpi_device *lid_device;
168
-static u8 lid_init_state = ACPI_BUTTON_LID_INIT_METHOD;
167
+static long lid_init_state = -1;
169168 
170169 static unsigned long lid_report_interval __read_mostly = 500;
171170 module_param(lid_report_interval, ulong, 0644);
....@@ -193,7 +192,6 @@
193192 static int acpi_lid_notify_state(struct acpi_device *device, int state)
194193 {
195194 	struct acpi_button *button = acpi_driver_data(device);
196
-	int ret;
197195 	ktime_t next_report;
198196 	bool do_update;
199197 
....@@ -270,18 +268,7 @@
270268 		button->last_time = ktime_get();
271269 	}
272270 
273
-	ret = blocking_notifier_call_chain(&acpi_lid_notifier, state, device);
274
-	if (ret == NOTIFY_DONE)
275
-		ret = blocking_notifier_call_chain(&acpi_lid_notifier, state,
276
-						   device);
277
-	if (ret == NOTIFY_DONE || ret == NOTIFY_OK) {
278
-		/*
279
-		 * It is also regarded as success if the notifier_chain
280
-		 * returns NOTIFY_OK or NOTIFY_DONE.
281
-		 */
282
-		ret = 0;
283
-	}
284
-	return ret;
271
+	return 0;
285272 }
286273 
287274 static int __maybe_unused acpi_button_state_seq_show(struct seq_file *seq,
....@@ -378,18 +365,6 @@
378365 /* --------------------------------------------------------------------------
379366                                 Driver Interface
380367    -------------------------------------------------------------------------- */
381
-int acpi_lid_notifier_register(struct notifier_block *nb)
382
-{
383
-	return blocking_notifier_chain_register(&acpi_lid_notifier, nb);
384
-}
385
-EXPORT_SYMBOL(acpi_lid_notifier_register);
386
-
387
-int acpi_lid_notifier_unregister(struct notifier_block *nb)
388
-{
389
-	return blocking_notifier_chain_unregister(&acpi_lid_notifier, nb);
390
-}
391
-EXPORT_SYMBOL(acpi_lid_notifier_unregister);
392
-
393368 int acpi_lid_open(void)
394369 {
395370 	if (!lid_device)
....@@ -441,7 +416,7 @@
441416 	switch (event) {
442417 	case ACPI_FIXED_HARDWARE_EVENT:
443418 		event = ACPI_BUTTON_NOTIFY_STATUS;
444
-		/* fall through */
419
+		fallthrough;
445420 	case ACPI_BUTTON_NOTIFY_STATUS:
446421 		input = button->input;
447422 		if (button->type == ACPI_BUTTON_TYPE_LID) {
....@@ -519,7 +494,8 @@
519494 	char *name, *class;
520495 	int error;
521496 
522
-	if (!strcmp(hid, ACPI_BUTTON_HID_LID) && dmi_check_system(lid_blacklst))
497
+	if (!strcmp(hid, ACPI_BUTTON_HID_LID) &&
498
+	     lid_init_state == ACPI_BUTTON_LID_INIT_DISABLED)
523499 		return -ENODEV;
524500 
525501 	button = kzalloc(sizeof(struct acpi_button), GFP_KERNEL);
....@@ -625,36 +601,30 @@
625601 static int param_set_lid_init_state(const char *val,
626602 				    const struct kernel_param *kp)
627603 {
628
-	int result = 0;
604
+	int i;
629605 
630
-	if (!strncmp(val, "open", sizeof("open") - 1)) {
631
-		lid_init_state = ACPI_BUTTON_LID_INIT_OPEN;
632
-		pr_info("Notify initial lid state as open\n");
633
-	} else if (!strncmp(val, "method", sizeof("method") - 1)) {
634
-		lid_init_state = ACPI_BUTTON_LID_INIT_METHOD;
635
-		pr_info("Notify initial lid state with _LID return value\n");
636
-	} else if (!strncmp(val, "ignore", sizeof("ignore") - 1)) {
637
-		lid_init_state = ACPI_BUTTON_LID_INIT_IGNORE;
638
-		pr_info("Do not notify initial lid state\n");
639
-	} else
640
-		result = -EINVAL;
641
-	return result;
606
+	i = sysfs_match_string(lid_init_state_str, val);
607
+	if (i < 0)
608
+		return i;
609
+
610
+	lid_init_state = i;
611
+	pr_info("Initial lid state set to '%s'\n", lid_init_state_str[i]);
612
+	return 0;
642613 }
643614 
644
-static int param_get_lid_init_state(char *buffer,
645
-				    const struct kernel_param *kp)
615
+static int param_get_lid_init_state(char *buf, const struct kernel_param *kp)
646616 {
647
-	switch (lid_init_state) {
648
-	case ACPI_BUTTON_LID_INIT_OPEN:
649
-		return sprintf(buffer, "open");
650
-	case ACPI_BUTTON_LID_INIT_METHOD:
651
-		return sprintf(buffer, "method");
652
-	case ACPI_BUTTON_LID_INIT_IGNORE:
653
-		return sprintf(buffer, "ignore");
654
-	default:
655
-		return sprintf(buffer, "invalid");
656
-	}
657
-	return 0;
617
+	int i, c = 0;
618
+
619
+	for (i = 0; i < ARRAY_SIZE(lid_init_state_str); i++)
620
+		if (i == lid_init_state)
621
+			c += sprintf(buf + c, "[%s] ", lid_init_state_str[i]);
622
+		else
623
+			c += sprintf(buf + c, "%s ", lid_init_state_str[i]);
624
+
625
+	buf[c - 1] = '\n'; /* Replace the final space with a newline */
626
+
627
+	return c;
658628 }
659629 
660630 module_param_call(lid_init_state,
....@@ -664,6 +634,16 @@
664634 
665635 static int acpi_button_register_driver(struct acpi_driver *driver)
666636 {
637
+	const struct dmi_system_id *dmi_id;
638
+
639
+	if (lid_init_state == -1) {
640
+		dmi_id = dmi_first_match(dmi_lid_quirks);
641
+		if (dmi_id)
642
+			lid_init_state = (long)dmi_id->driver_data;
643
+		else
644
+			lid_init_state = ACPI_BUTTON_LID_INIT_METHOD;
645
+	}
646
+
667647 	/*
668648 	 * Modules such as nouveau.ko and i915.ko have a link time dependency
669649 	 * on acpi_lid_open(), and would therefore not be loadable on ACPI