[PATCH 2/4] platform/x86: thinkpad_acpi: Support for trackpoint doubletap

[Mark Pearson]

Lenovo trackpoints are adding the ability to generate a doubletap event.
This handles the doubletap event and sends the KEY_DOUBLECLICK event to
userspace.

Signed-off-by: Mark Pearson <mpearson-lenovo@xxxxxxxxx>
Signed-off-by: Vishnu Sankar <vsankar@xxxxxxxxxx>
---
 drivers/platform/x86/thinkpad_acpi.c | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/drivers/platform/x86/thinkpad_acpi.c b/drivers/platform/x86/thinkpad_acpi.c
index 82429e59999d..2bbb32c898e9 100644
--- a/drivers/platform/x86/thinkpad_acpi.c
+++ b/drivers/platform/x86/thinkpad_acpi.c
@@ -232,6 +232,7 @@ enum tpacpi_hkey_event_t {
 
 	/* Misc */
 	TP_HKEY_EV_RFKILL_CHANGED	= 0x7000, /* rfkill switch changed */
+	TP_HKEY_EV_TRACKPOINT_DOUBLETAP = 0x8036, /* doubletap on Trackpoint*/
 };
 
 /****************************************************************************
@@ -4081,6 +4082,22 @@ static void hotkey_notify(struct ibm_struct *ibm, u32 event)
 				break;
 			}
 			fallthrough;	/* to default */
+		case 8:
+			/* 0x8036: Trackpoint doubletaps */
+			if (hkey == TP_HKEY_EV_TRACKPOINT_DOUBLETAP) {
+				send_acpi_ev = true;
+				ignore_acpi_ev = false;
+				known_ev = true;
+				/* Send to user space */
+				mutex_lock(&tpacpi_inputdev_send_mutex);
+				input_report_key(tpacpi_inputdev, KEY_DOUBLECLICK, 1);
+				input_sync(tpacpi_inputdev);
+				input_report_key(tpacpi_inputdev, KEY_DOUBLECLICK, 0);
+				input_sync(tpacpi_inputdev);
+				mutex_unlock(&tpacpi_inputdev_send_mutex);
+				break;
+			}
+			fallthrough;	/* to default */
 		default:
 			known_ev = false;
 		}
-- 
2.44.0