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2023-12-11 d2ccde1c8e90d38cee87a1b0309ad2827f3fd30d 
 kernel/drivers/platform/x86/wmi.c
....@@ -1,3 +1,4 @@
1
+// SPDX-License-Identifier: GPL-2.0-or-later
12 /*
23  *  ACPI-WMI mapping driver
34  *
....@@ -11,24 +12,6 @@
1112  *  WMI bus infrastructure by Andrew Lutomirski and Darren Hart:
1213  *    Copyright (C) 2015 Andrew Lutomirski
1314  *    Copyright (C) 2017 VMware, Inc. All Rights Reserved.
14
- *
15
- * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
16
- *
17
- *  This program is free software; you can redistribute it and/or modify
18
- *  it under the terms of the GNU General Public License as published by
19
- *  the Free Software Foundation; either version 2 of the License, or (at
20
- *  your option) any later version.
21
- *
22
- *  This program is distributed in the hope that it will be useful, but
23
- *  WITHOUT ANY WARRANTY; without even the implied warranty of
24
- *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
25
- *  General Public License for more details.
26
- *
27
- *  You should have received a copy of the GNU General Public License along
28
- *  with this program; if not, write to the Free Software Foundation, Inc.,
29
- *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
30
- *
31
- * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
3215  */
3316 
3417 #define pr_fmt(fmt)	KBUILD_MODNAME ": " fmt
....@@ -46,6 +29,7 @@
4629 #include <linux/uaccess.h>
4730 #include <linux/uuid.h>
4831 #include <linux/wmi.h>
32
+#include <linux/fs.h>
4933 #include <uapi/linux/wmi.h>
5034 
5135 ACPI_MODULE_NAME("wmi");
....@@ -127,11 +111,11 @@
127111 
128112 static bool find_guid(const char *guid_string, struct wmi_block **out)
129113 {
130
-	uuid_le guid_input;
114
+	guid_t guid_input;
131115 	struct wmi_block *wblock;
132116 	struct guid_block *block;
133117 
134
-	if (uuid_le_to_bin(guid_string, &guid_input))
118
+	if (guid_parse(guid_string, &guid_input))
135119 		return false;
136120 
137121 	list_for_each_entry(wblock, &wmi_block_list, list) {
....@@ -144,6 +128,28 @@
144128 		}
145129 	}
146130 	return false;
131
+}
132
+
133
+static const void *find_guid_context(struct wmi_block *wblock,
134
+				      struct wmi_driver *wdriver)
135
+{
136
+	const struct wmi_device_id *id;
137
+	guid_t guid_input;
138
+
139
+	if (wblock == NULL || wdriver == NULL)
140
+		return NULL;
141
+	if (wdriver->id_table == NULL)
142
+		return NULL;
143
+
144
+	id = wdriver->id_table;
145
+	while (*id->guid_string) {
146
+		if (guid_parse(id->guid_string, &guid_input))
147
+			continue;
148
+		if (!memcmp(wblock->gblock.guid, &guid_input, 16))
149
+			return id->context;
150
+		id++;
151
+	}
152
+	return NULL;
147153 }
148154 
149155 static int get_subobj_info(acpi_handle handle, const char *pathname,
....@@ -196,7 +202,7 @@
196202 /**
197203  * set_required_buffer_size - Sets the buffer size needed for performing IOCTL
198204  * @wdev: A wmi bus device from a driver
199
- * @instance: Instance index
205
+ * @length: Required buffer size
200206  *
201207  * Allocates memory needed for buffer, stores the buffer size in that memory
202208  */
....@@ -216,8 +222,8 @@
216222  * @guid_string: 36 char string of the form fa50ff2b-f2e8-45de-83fa-65417f2f49ba
217223  * @instance: Instance index
218224  * @method_id: Method ID to call
219
- * &in: Buffer containing input for the method call
220
- * &out: Empty buffer to return the method results
225
+ * @in: Buffer containing input for the method call
226
+ * @out: Empty buffer to return the method results
221227  *
222228  * Call an ACPI-WMI method
223229  */
....@@ -238,8 +244,8 @@
238244  * @wdev: A wmi bus device from a driver
239245  * @instance: Instance index
240246  * @method_id: Method ID to call
241
- * &in: Buffer containing input for the method call
242
- * &out: Empty buffer to return the method results
247
+ * @in: Buffer containing input for the method call
248
+ * @out: Empty buffer to return the method results
243249  *
244250  * Call an ACPI-WMI method
245251  */
....@@ -335,9 +341,7 @@
335341 		 * expensive, but have no corresponding WCxx method. So we
336342 		 * should not fail if this happens.
337343 		 */
338
-		if (acpi_has_method(handle, wc_method))
339
-			wc_status = acpi_execute_simple_method(handle,
340
-								wc_method, 1);
344
+		wc_status = acpi_execute_simple_method(handle, wc_method, 1);
341345 	}
342346 
343347 	strcpy(method, "WQ");
....@@ -367,7 +371,7 @@
367371  * wmi_query_block - Return contents of a WMI block (deprecated)
368372  * @guid_string: 36 char string of the form fa50ff2b-f2e8-45de-83fa-65417f2f49ba
369373  * @instance: Instance index
370
- * &out: Empty buffer to return the contents of the data block to
374
+ * @out: Empty buffer to return the contents of the data block to
371375  *
372376  * Return the contents of an ACPI-WMI data block to a buffer
373377  */
....@@ -402,7 +406,7 @@
402406  * wmi_set_block - Write to a WMI block
403407  * @guid_string: 36 char string of the form fa50ff2b-f2e8-45de-83fa-65417f2f49ba
404408  * @instance: Instance index
405
- * &in: Buffer containing new values for the data block
409
+ * @in: Buffer containing new values for the data block
406410  *
407411  * Write the contents of the input buffer to an ACPI-WMI data block
408412  */
....@@ -513,6 +517,7 @@
513517 
514518 /**
515519  * wmi_install_notify_handler - Register handler for WMI events
520
+ * @guid: 36 char string of the form fa50ff2b-f2e8-45de-83fa-65417f2f49ba
516521  * @handler: Function to handle notifications
517522  * @data: Data to be returned to handler when event is fired
518523  *
....@@ -523,12 +528,12 @@
523528 {
524529 	struct wmi_block *block;
525530 	acpi_status status = AE_NOT_EXIST;
526
-	uuid_le guid_input;
531
+	guid_t guid_input;
527532 
528533 	if (!guid || !handler)
529534 		return AE_BAD_PARAMETER;
530535 
531
-	if (uuid_le_to_bin(guid, &guid_input))
536
+	if (guid_parse(guid, &guid_input))
532537 		return AE_BAD_PARAMETER;
533538 
534539 	list_for_each_entry(block, &wmi_block_list, list) {
....@@ -555,6 +560,7 @@
555560 
556561 /**
557562  * wmi_uninstall_notify_handler - Unregister handler for WMI events
563
+ * @guid: 36 char string of the form fa50ff2b-f2e8-45de-83fa-65417f2f49ba
558564  *
559565  * Unregister handler for events sent to the ACPI-WMI mapper device.
560566  */
....@@ -562,12 +568,12 @@
562568 {
563569 	struct wmi_block *block;
564570 	acpi_status status = AE_NOT_EXIST;
565
-	uuid_le guid_input;
571
+	guid_t guid_input;
566572 
567573 	if (!guid)
568574 		return AE_BAD_PARAMETER;
569575 
570
-	if (uuid_le_to_bin(guid, &guid_input))
576
+	if (guid_parse(guid, &guid_input))
571577 		return AE_BAD_PARAMETER;
572578 
573579 	list_for_each_entry(block, &wmi_block_list, list) {
....@@ -641,6 +647,25 @@
641647 	return find_guid(guid_string, NULL);
642648 }
643649 EXPORT_SYMBOL_GPL(wmi_has_guid);
650
+
651
+/**
652
+ * wmi_get_acpi_device_uid() - Get _UID name of ACPI device that defines GUID
653
+ * @guid_string: 36 char string of the form fa50ff2b-f2e8-45de-83fa-65417f2f49ba
654
+ *
655
+ * Find the _UID of ACPI device associated with this WMI GUID.
656
+ *
657
+ * Return: The ACPI _UID field value or NULL if the WMI GUID was not found
658
+ */
659
+char *wmi_get_acpi_device_uid(const char *guid_string)
660
+{
661
+	struct wmi_block *wblock = NULL;
662
+
663
+	if (!find_guid(guid_string, &wblock))
664
+		return NULL;
665
+
666
+	return acpi_device_uid(wblock->acpi_device);
667
+}
668
+EXPORT_SYMBOL_GPL(wmi_get_acpi_device_uid);
644669 
645670 static struct wmi_block *dev_to_wblock(struct device *dev)
646671 {
....@@ -778,10 +803,10 @@
778803 	if (id == NULL)
779804 		return 0;
780805 
781
-	while (id->guid_string) {
782
-		uuid_le driver_guid;
806
+	while (*id->guid_string) {
807
+		guid_t driver_guid;
783808 
784
-		if (WARN_ON(uuid_le_to_bin(id->guid_string, &driver_guid)))
809
+		if (WARN_ON(guid_parse(id->guid_string, &driver_guid)))
785810 			continue;
786811 		if (!memcmp(&driver_guid, wblock->gblock.guid, 16))
787812 			return 1;
....@@ -896,7 +921,7 @@
896921 	.read		= wmi_char_read,
897922 	.open		= wmi_char_open,
898923 	.unlocked_ioctl	= wmi_ioctl,
899
-	.compat_ioctl	= wmi_ioctl,
924
+	.compat_ioctl	= compat_ptr_ioctl,
900925 };
901926 
902927 static int wmi_dev_probe(struct device *dev)
....@@ -911,7 +936,8 @@
911936 		dev_warn(dev, "failed to enable device -- probing anyway\n");
912937 
913938 	if (wdriver->probe) {
914
-		ret = wdriver->probe(dev_to_wdev(dev));
939
+		ret = wdriver->probe(dev_to_wdev(dev),
940
+				find_guid_context(wblock, wdriver));
915941 		if (ret != 0)
916942 			goto probe_failure;
917943 	}
....@@ -997,19 +1023,19 @@
9971023 	.remove = wmi_dev_remove,
9981024 };
9991025 
1000
-static struct device_type wmi_type_event = {
1026
+static const struct device_type wmi_type_event = {
10011027 	.name = "event",
10021028 	.groups = wmi_event_groups,
10031029 	.release = wmi_dev_release,
10041030 };
10051031 
1006
-static struct device_type wmi_type_method = {
1032
+static const struct device_type wmi_type_method = {
10071033 	.name = "method",
10081034 	.groups = wmi_method_groups,
10091035 	.release = wmi_dev_release,
10101036 };
10111037 
1012
-static struct device_type wmi_type_data = {
1038
+static const struct device_type wmi_type_data = {
10131039 	.name = "data",
10141040 	.groups = wmi_data_groups,
10151041 	.release = wmi_dev_release,
....@@ -1099,8 +1125,7 @@
10991125 	}
11001126 }
11011127 
1102
-static bool guid_already_parsed(struct acpi_device *device,
1103
-				const u8 *guid)
1128
+static bool guid_already_parsed(struct acpi_device *device, const u8 *guid)
11041129 {
11051130 	struct wmi_block *wblock;
11061131 
....@@ -1310,10 +1335,8 @@
13101335 		wblock->handler(event, wblock->handler_data);
13111336 	}
13121337 
1313
-	if (debug_event) {
1314
-		pr_info("DEBUG Event GUID: %pUL\n",
1315
-			wblock->gblock.guid);
1316
-	}
1338
+	if (debug_event)
1339
+		pr_info("DEBUG Event GUID: %pUL\n", wblock->gblock.guid);
13171340 
13181341 	acpi_bus_generate_netlink_event(
13191342 		wblock->acpi_device->pnp.device_class,