linux-kernel - [PATCH v2] platform/x86: intel-vbtn: Report switch events when event wakes device

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Message-Id: <20190520224124.153005-1-mathewk@chromium.org>
Date:   Mon, 20 May 2019 16:41:24 -0600
From:   Mathew King <mathewk@...omium.org>
To:     linux-kernel@...r.kernel.org
Cc:     Mathew King <mathewk@...omium.org>,
        AceLan Kao <acelan.kao@...onical.com>,
        Andy Shevchenko <andy@...radead.org>,
        Darren Hart <dvhart@...radead.org>,
        platform-driver-x86@...r.kernel.org,
        Jett Rink <jettrink@...omium.org>, Mario.Limonciello@...l.com
Subject: [PATCH v2] platform/x86: intel-vbtn: Report switch events when event wakes device

When a switch event, such as tablet mode/laptop mode or docked/undocked,
wakes a device make sure that the value of the swich is reported.
Without when a device is put in tablet mode from laptop mode when it is
suspended or vice versa the device will wake up but mode will be
incorrect.

Tested by suspending a device in laptop mode and putting it in tablet
mode, the device resumes and is in tablet mode. When suspending the
device in tablet mode and putting it in laptop mode the device resumes
and is in laptop mode.

Signed-off-by: Mathew King <mathewk@...omium.org>

---
Changes in v2:
  - Added comment explaining why switch events are reported
  - Format so that checkpatch is happy
---
 drivers/platform/x86/intel-vbtn.c | 16 ++++++++++++++--
 1 file changed, 14 insertions(+), 2 deletions(-)

diff --git a/drivers/platform/x86/intel-vbtn.c b/drivers/platform/x86/intel-vbtn.c
index 06cd7e818ed5..a0d0cecff55f 100644
--- a/drivers/platform/x86/intel-vbtn.c
+++ b/drivers/platform/x86/intel-vbtn.c
@@ -76,12 +76,24 @@ static void notify_handler(acpi_handle handle, u32 event, void *context)
 	struct platform_device *device = context;
 	struct intel_vbtn_priv *priv = dev_get_drvdata(&device->dev);
 	unsigned int val = !(event & 1); /* Even=press, Odd=release */
-	const struct key_entry *ke_rel;
+	const struct key_entry *ke, *ke_rel;
 	bool autorelease;
 
 	if (priv->wakeup_mode) {
-		if (sparse_keymap_entry_from_scancode(priv->input_dev, event)) {
+		ke = sparse_keymap_entry_from_scancode(priv->input_dev, event);
+		if (ke) {
 			pm_wakeup_hard_event(&device->dev);
+
+			/*
+			 * Switch events like tablet mode will wake the device
+			 * and report the new switch position to the input
+			 * subsystem.
+			 */
+			if (ke->type == KE_SW)
+				sparse_keymap_report_event(priv->input_dev,
+							   event,
+							   val,
+							   0);
 			return;
 		}
 		goto out_unknown;
-- 
2.21.0.1020.gf2820cf01a-goog