linux-kernel - [PATCH v3 2/2] intel-hid: add alternative method to enable switches

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Date:   Fri,  4 Dec 2020 17:02:35 +0100
From:   Elia Devito <eliadevito@...il.com>
To:     unlisted-recipients:; (no To-header on input)
Cc:     Elia Devito <eliadevito@...il.com>,
        Alex Hung <alex.hung@...onical.com>,
        Hans de Goede <hdegoede@...hat.com>,
        Mark Gross <mgross@...ux.intel.com>,
        platform-driver-x86@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v3 2/2] intel-hid: add alternative method to enable switches

From: Elia Devito <eliadevito@...il.com>

Some convertible have unreliable VGBS return, in these cases we enable
support when receiving the first event.

Signed-off-by: Elia Devito <eliadevito@...il.com>
---
 drivers/platform/x86/intel-hid.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/drivers/platform/x86/intel-hid.c b/drivers/platform/x86/intel-hid.c
index d2f892665ec6..054bc37da2cf 100644
--- a/drivers/platform/x86/intel-hid.c
+++ b/drivers/platform/x86/intel-hid.c
@@ -423,6 +423,19 @@ static void notify_handler(acpi_handle handle, u32 event, void *context)
 	struct platform_device *device = context;
 	struct intel_hid_priv *priv = dev_get_drvdata(&device->dev);
 	unsigned long long ev_index;
+	int err;
+
+	/*
+	 * Some convertible have unreliable VGBS return which could cause incorrect
+	 * SW_TABLET_MODE report, in these cases we enable support when receiving
+	 * the first event instead of during driver setup.
+	 */
+	if (!priv->switches && (event == 0xcc || event == 0xcd)) {
+		dev_info(&device->dev, "switch event received, enable switches supports\n");
+		err = intel_hid_switches_setup(device);
+		if (err)
+			pr_err("Failed to setup Intel HID switches\n");
+	}
 
 	if (priv->wakeup_mode) {
 		/*
-- 
2.28.0