Re: [PATCH] Input: xpad - fix rumble on Xbox One controllers with 2015 firmware

It looks like SteamOS has always used this rumble packet for Xbox One per [0].
Commit 0604949ce3b9a59c ("Input: xpad - add rumble support for Xbox One
controller") implemented a different rumble packet than Valve did in
their fork. Pierre-Loup A. Griffais pushed some of their changes upstream in
commit 2a6d7527b35cf987 ("Input: xpad - update Xbox One Force Feedback
Support") but seemed to have missed these differences in the packet format.


[0]: https://github.com/ValveSoftware/steamos_kernel/commit/f5f73eb889cac32cbabfc40362fe5635a2255836

On 05/31/2016 05:32 PM, Dmitry Torokhov wrote:

Hi Cameron,

On Tue, May 31, 2016 at 05:19:51PM -0500, Cameron Gutman wrote:

quoted

Xbox One controllers that shipped with or were upgraded to the 2015
firmware discard the current rumble packets we send. This patch changes
the Xbox One rumble packet to a form that the newer firmware will accept.

But what do we do with the older devices?

Thanks.

quoted

It is based on changes made to support newer Xbox One controllers in
the SteamOS brewmaster-4.1 kernel branch.

Signed-off-by: Cameron Gutman <redacted>
---
 drivers/input/joystick/xpad.c | 16 ++++++++--------
 1 file changed, 8 insertions(+), 8 deletions(-)

diff --git a/drivers/input/joystick/xpad.c b/drivers/input/joystick/xpad.c
index 804dbcc..923c572 100644
--- a/drivers/input/joystick/xpad.c
+++ b/drivers/input/joystick/xpad.c

@@ -1031,17 +1031,17 @@ static int xpad_play_effect(struct input_dev *dev, void *data, struct ff_effect
 
 	case XTYPE_XBOXONE:
 		packet->data[0] = 0x09; /* activate rumble */
-		packet->data[1] = 0x08;
+		packet->data[1] = 0x00;
 		packet->data[2] = xpad->odata_serial++;
-		packet->data[3] = 0x08; /* continuous effect */
-		packet->data[4] = 0x00; /* simple rumble mode */
-		packet->data[5] = 0x03; /* L and R actuator only */
-		packet->data[6] = 0x00; /* TODO: LT actuator */
-		packet->data[7] = 0x00; /* TODO: RT actuator */
+		packet->data[3] = 0x09;
+		packet->data[4] = 0x00;
+		packet->data[5] = 0x0F;
+		packet->data[6] = 0x00;
+		packet->data[7] = 0x00;
 		packet->data[8] = strong / 512;	/* left actuator */
 		packet->data[9] = weak / 512;	/* right actuator */
-		packet->data[10] = 0x80;	/* length of pulse */
-		packet->data[11] = 0x00;	/* stop period of pulse */
+		packet->data[10] = 0xFF;
+		packet->data[11] = 0x00;
 		packet->data[12] = 0x00;
 		packet->len = 13;
 		packet->pending = true;

-- 
2.7.4