linux-kernel - [PATCH] HID: usbhid: hid-pidff: fix initialisation for devices that pre-play effects

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Date: Sat, 24 Feb 2024 13:00:56 +0100
From: Jules Noirant <jules.noirant@...nge.fr>
To: 
Cc: jikos@...nel.org,
	Jules Noirant <jules.noirant@...nge.fr>,
	Benjamin Tissoires <benjamin.tissoires@...hat.com>,
	linux-usb@...r.kernel.org,
	linux-input@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] HID: usbhid: hid-pidff: fix initialisation for devices that pre-play effects

Some PID compliant devices play effects outside of the usb drivers when you
power them, for example an autocenter spring. These effects are thus
re-triggered when you reset the device through the driver init sequence,
preventing other effects to be played in some cases.

This fix makes sure all the effects currently played are stopped after
resetting the device. More specifically, it brings compatibility to the
Brunner CLS-P joystick and potentially more of their products.

Signed-off-by: Jules Noirant <jules.noirant@...nge.fr>
---
 drivers/hid/usbhid/hid-pidff.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/drivers/hid/usbhid/hid-pidff.c b/drivers/hid/usbhid/hid-pidff.c
index 3b4ee21cd..aade18f9e 100644
--- a/drivers/hid/usbhid/hid-pidff.c
+++ b/drivers/hid/usbhid/hid-pidff.c
@@ -109,8 +109,9 @@ static const u8 pidff_pool[] = { 0x80, 0x83, 0xa9 };
 /* Special field key tables used to put special field keys into arrays */
 
 #define PID_ENABLE_ACTUATORS	0
-#define PID_RESET		1
-static const u8 pidff_device_control[] = { 0x97, 0x9a };
+#define PID_STOP_ALL_EFFECTS	1
+#define PID_RESET		2
+static const u8 pidff_device_control[] = { 0x97, 0x99, 0x9a };
 
 #define PID_CONSTANT	0
 #define PID_RAMP	1
@@ -1157,6 +1158,10 @@ static void pidff_reset(struct pidff_device *pidff)
 	hid_hw_request(hid, pidff->reports[PID_DEVICE_CONTROL], HID_REQ_SET_REPORT);
 	hid_hw_wait(hid);
 
+	pidff->device_control->value[0] = pidff->control_id[PID_STOP_ALL_EFFECTS];
+	hid_hw_request(hid, pidff->reports[PID_DEVICE_CONTROL], HID_REQ_SET_REPORT);
+	hid_hw_wait(hid);
+
 	pidff->device_control->value[0] =
 		pidff->control_id[PID_ENABLE_ACTUATORS];
 	hid_hw_request(hid, pidff->reports[PID_DEVICE_CONTROL], HID_REQ_SET_REPORT);
-- 
2.40.1