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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, Hans de Goede <hdegoede@redhat.com>,
        Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
        Sasha Levin <sashal@kernel.org>,
        Stefan Seyfried <seife+kernel@b1-systems.com>,
        Kenneth Chan <kenneth.t.chan@gmail.com>
Subject: [PATCH 5.15 93/98] platform/x86: panasonic-laptop: dont report duplicate brightness key-presses
Date:   Tue,  5 Jul 2022 13:58:51 +0200
Message-Id: <20220705115620.207967081@linuxfoundation.org>
In-Reply-To: <20220705115617.568350164@linuxfoundation.org>
References: <20220705115617.568350164@linuxfoundation.org>
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From: Hans de Goede <hdegoede@redhat.com>

[ Upstream commit 1f2c9de83a50447a2d7166f6273ab0c0e97cd68e ]

The brightness key-presses might also get reported by the ACPI video bus,
check for this and in this case don't report the presses to avoid reporting
2 presses for a single key-press.

Fixes: ed83c9171829 ("platform/x86: panasonic-laptop: Resolve hotkey double trigger bug")
Reported-and-tested-by: Stefan Seyfried <seife+kernel@b1-systems.com>
Reported-and-tested-by: Kenneth Chan <kenneth.t.chan@gmail.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20220624112340.10130-6-hdegoede@redhat.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/platform/x86/Kconfig            | 1 +
 drivers/platform/x86/panasonic-laptop.c | 8 ++++++++
 2 files changed, 9 insertions(+)

diff --git a/drivers/platform/x86/Kconfig b/drivers/platform/x86/Kconfig
index e21ea3d23e6f..50a5c4f3cefd 100644
--- a/drivers/platform/x86/Kconfig
+++ b/drivers/platform/x86/Kconfig
@@ -871,6 +871,7 @@ config PANASONIC_LAPTOP
 	tristate "Panasonic Laptop Extras"
 	depends on INPUT && ACPI
 	depends on BACKLIGHT_CLASS_DEVICE
+	depends on ACPI_VIDEO=n || ACPI_VIDEO
 	select INPUT_SPARSEKMAP
 	help
 	  This driver adds support for access to backlight control and hotkeys
diff --git a/drivers/platform/x86/panasonic-laptop.c b/drivers/platform/x86/panasonic-laptop.c
index cd3c23593eee..65ca863ffb9f 100644
--- a/drivers/platform/x86/panasonic-laptop.c
+++ b/drivers/platform/x86/panasonic-laptop.c
@@ -132,6 +132,7 @@
 #include <linux/slab.h>
 #include <linux/types.h>
 #include <linux/uaccess.h>
+#include <acpi/video.h>
 
 MODULE_AUTHOR("Hiroshi Miura <miura@da-cha.org>");
 MODULE_AUTHOR("David Bronaugh <dbronaugh@linuxboxen.org>");
@@ -783,6 +784,13 @@ static void acpi_pcc_generate_keyinput(struct pcc_acpi *pcc)
 					key, 0x80, false);
 	}
 
+	/*
+	 * Don't report brightness key-presses if they are also reported
+	 * by the ACPI video bus.
+	 */
+	if ((key == 1 || key == 2) && acpi_video_handles_brightness_key_presses())
+		return;
+
 	if (!sparse_keymap_report_event(hotk_input_dev, key, updown, false))
 		pr_err("Unknown hotkey event: 0x%04llx\n", result);
 }
-- 
2.35.1