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2024-02-20 ea08eeccae9297f7aabd2ef7f0c2517ac4549acc 
 kernel/drivers/acpi/acpi_video.c
....@@ -1,23 +1,10 @@
1
+// SPDX-License-Identifier: GPL-2.0-or-later
12 /*
23  *  video.c - ACPI Video Driver
34  *
45  *  Copyright (C) 2004 Luming Yu <luming.yu@intel.com>
56  *  Copyright (C) 2004 Bruno Ducrot <ducrot@poupinou.org>
67  *  Copyright (C) 2006 Thomas Tuttle <linux-kernel@ttuttle.net>
7
- *
8
- * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
9
- *
10
- *  This program is free software; you can redistribute it and/or modify
11
- *  it under the terms of the GNU General Public License as published by
12
- *  the Free Software Foundation; either version 2 of the License, or (at
13
- *  your option) any later version.
14
- *
15
- *  This program is distributed in the hope that it will be useful, but
16
- *  WITHOUT ANY WARRANTY; without even the implied warranty of
17
- *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
18
- *  General Public License for more details.
19
- *
20
- * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
218  */
229 
2310 #include <linux/kernel.h>
....@@ -511,6 +498,22 @@
511498 		DMI_MATCH(DMI_PRODUCT_NAME, "SATELLITE R830"),
512499 		},
513500 	},
501
+	{
502
+	 .callback = video_disable_backlight_sysfs_if,
503
+	 .ident = "Toshiba Satellite Z830",
504
+	 .matches = {
505
+		DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
506
+		DMI_MATCH(DMI_PRODUCT_NAME, "SATELLITE Z830"),
507
+		},
508
+	},
509
+	{
510
+	 .callback = video_disable_backlight_sysfs_if,
511
+	 .ident = "Toshiba Portege Z830",
512
+	 .matches = {
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+		DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
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+		DMI_MATCH(DMI_PRODUCT_NAME, "PORTEGE Z830"),
515
+		},
516
+	},
514517 	/*
515518 	 * Some machine's _DOD IDs don't have bit 31(Device ID Scheme) set
516519 	 * but the IDs actually follow the Device ID Scheme.
....@@ -600,7 +603,7 @@
600603 				ACPI_VIDEO_FIRST_LEVEL - 1 - bqc_value;
601604 
602605 		level = device->brightness->levels[bqc_value +
603
-		                                   ACPI_VIDEO_FIRST_LEVEL];
606
+						   ACPI_VIDEO_FIRST_LEVEL];
604607 	} else {
605608 		level = bqc_value;
606609 	}
....@@ -721,9 +724,13 @@
721724  *			event notify code.
722725  *	lcd_flag	:
723726  *		0.	The system BIOS should automatically control the brightness level
724
- *			of the LCD when the power changes from AC to DC
727
+ *			of the LCD when:
728
+ *			- the power changes from AC to DC (ACPI appendix B)
729
+ *			- a brightness hotkey gets pressed (implied by Win7/8 backlight docs)
725730  *		1.	The system BIOS should NOT automatically control the brightness
726
- *			level of the LCD when the power changes from AC to DC.
731
+ *			level of the LCD when:
732
+ *			- the power changes from AC to DC (ACPI appendix B)
733
+ *			- a brightness hotkey gets pressed (implied by Win7/8 backlight docs)
727734  *  Return Value:
728735  *		-EINVAL	wrong arg.
729736  */
....@@ -961,7 +968,7 @@
961968 	int i, max_level = 0;
962969 	unsigned long long level, level_old;
963970 	struct acpi_video_device_brightness *br = NULL;
964
-	int result = -EINVAL;
971
+	int result;
965972 
966973 	result = acpi_video_get_levels(device->dev, &br, &max_level);
967974 	if (result)
....@@ -1008,8 +1015,8 @@
10081015 		goto out_free_levels;
10091016 
10101017 	ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1011
-	                  "found %d brightness levels\n",
1012
-	                  br->count - ACPI_VIDEO_FIRST_LEVEL));
1018
+			  "found %d brightness levels\n",
1019
+			  br->count - ACPI_VIDEO_FIRST_LEVEL));
10131020 	return 0;
10141021 
10151022 out_free_levels:
....@@ -2205,7 +2212,7 @@
22052212 	if (register_count) {
22062213 		/*
22072214 		 * if the function of acpi_video_register is already called,
2208
-		 * don't register the acpi_vide_bus again and return no error.
2215
+		 * don't register the acpi_video_bus again and return no error.
22092216 		 */
22102217 		goto leave;
22112218 	}