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Subject[PATCH v2 1/2] Input: xpad - support some quirky Xbox One pads
Date
There are several quirky Xbox One pads that depend on initialization
packets that the Microsoft pads don't require. To deal with these,
I've added a mechanism for issuing device-specific initialization
packets using a VID/PID-based quirks list.

For the initial set of init quirks, I have added quirk handling from
Valve's Steam Link xpad driver[0] and the 360Controller project[1] for
macOS to enable some new pads to work properly.

This should enable full functionality on the following quirky pads:
0x0e6f:0x0165 - Titanfall 2 gamepad (previously fully non-functional)
0x0f0d:0x0067 - Hori Horipad (analog sticks previously non-functional)
0x24c6:0x541a - PowerA Xbox One pad (previously fully non-functional)
0x24c6:0x542a - PowerA Xbox One pad (previously fully non-functional)
0x24c6:0x543a - PowerA Xbox One pad (previously fully non-functional)

[0]: https://github.com/ValveSoftware/steamlink-sdk/blob/master/kernel/drivers/input/joystick/xpad.c
[1]: https://github.com/360Controller/360Controller

Signed-off-by: Cameron Gutman <aicommander@gmail.com>
---
v2:
- Fixed up the commit message which had some lines incorrectly copied
from the previous submission.
- Added more details as the previous commit message was a bit sparse.

---
drivers/input/joystick/xpad.c | 114 +++++++++++++++++++++++++++++++++++++-----
1 file changed, 101 insertions(+), 13 deletions(-)

diff --git a/drivers/input/joystick/xpad.c b/drivers/input/joystick/xpad.c
index 155fcb3..efb798a 100644
--- a/drivers/input/joystick/xpad.c
+++ b/drivers/input/joystick/xpad.c
@@ -337,6 +337,64 @@ static struct usb_device_id xpad_table[] = {

MODULE_DEVICE_TABLE(usb, xpad_table);

+struct xboxone_init_packet {
+ u16 idVendor;
+ u16 idProduct;
+ const u8 *data;
+ u8 len;
+};
+
+#define XBOXONE_INIT_PKT(_vid, _pid, _data) \
+ { \
+ .idVendor = (_vid), \
+ .idProduct = (_pid), \
+ .data = (_data), \
+ .len = ARRAY_SIZE(_data), \
+ }
+
+
+/*
+ * This packet is required for all Xbox One pads with 2015
+ * or later firmware installed (or present from the factory).
+ */
+static const u8 xboxone_fw2015_init[] = {
+ 0x05, 0x20, 0x00, 0x01, 0x00
+};
+
+ /*
+ * This packet is required for the Titanfall 2 Xbox One pads
+ * (0x0e6f:0x0165) to finish initialization and for Hori pads
+ * (0x0f0d:0x0067) to make the analog sticks work.
+ */
+static const u8 xboxone_hori_init[] = {
+ 0x01, 0x20, 0x00, 0x09, 0x00, 0x04, 0x20, 0x3a,
+ 0x00, 0x00, 0x00, 0x80, 0x00
+};
+
+/*
+ * A rumble packet is required for some PowerA pads to start
+ * sending input reports. One of those pads is (0x24c6:0x543a).
+ */
+static const u8 xboxone_zerorumble_init[] = {
+ 0x09, 0x00, 0x00, 0x09, 0x00, 0x0F, 0x00, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x00
+};
+
+/*
+ * This specifies the selection of init packets that a gamepad
+ * will be sent on init *and* the order in which they will be
+ * sent. The correct sequence number will be added when the
+ * packet is going to be sent.
+ */
+static const struct xboxone_init_packet xboxone_init_packets[] = {
+ XBOXONE_INIT_PKT(0x0e6f, 0x0165, xboxone_hori_init),
+ XBOXONE_INIT_PKT(0x0f0d, 0x0067, xboxone_hori_init),
+ XBOXONE_INIT_PKT(0x0000, 0x0000, xboxone_fw2015_init),
+ XBOXONE_INIT_PKT(0x24c6, 0x541a, xboxone_zerorumble_init),
+ XBOXONE_INIT_PKT(0x24c6, 0x542a, xboxone_zerorumble_init),
+ XBOXONE_INIT_PKT(0x24c6, 0x543a, xboxone_zerorumble_init),
+};
+
struct xpad_output_packet {
u8 data[XPAD_PKT_LEN];
u8 len;
@@ -373,6 +431,7 @@ struct usb_xpad {

struct xpad_output_packet out_packets[XPAD_NUM_OUT_PACKETS];
int last_out_packet;
+ int init_seq;

#if defined(CONFIG_JOYSTICK_XPAD_LEDS)
struct xpad_led *led;
@@ -748,11 +807,47 @@ static void xpad_irq_in(struct urb *urb)
}

/* Callers must hold xpad->odata_lock spinlock */
+static bool xpad_prepare_next_init_packet(struct usb_xpad *xpad)
+{
+ const struct xboxone_init_packet *init_packet;
+
+ if (xpad->xtype != XTYPE_XBOXONE)
+ return false;
+
+ /* Perform initialization sequence for Xbox One pads that require it */
+ while (xpad->init_seq < ARRAY_SIZE(xboxone_init_packets)) {
+ init_packet = &xboxone_init_packets[xpad->init_seq++];
+
+ if (init_packet->idVendor != 0 &&
+ init_packet->idVendor != xpad->dev->id.vendor)
+ continue;
+
+ if (init_packet->idProduct != 0 &&
+ init_packet->idProduct != xpad->dev->id.product)
+ continue;
+
+ /* This packet applies to our device, so prepare to send it */
+ memcpy(xpad->odata, init_packet->data, init_packet->len);
+ xpad->irq_out->transfer_buffer_length = init_packet->len;
+
+ /* Update packet with current sequence number */
+ xpad->odata[2] = xpad->odata_serial++;
+ return true;
+ }
+
+ return false;
+}
+
+/* Callers must hold xpad->odata_lock spinlock */
static bool xpad_prepare_next_out_packet(struct usb_xpad *xpad)
{
struct xpad_output_packet *pkt, *packet = NULL;
int i;

+ /* We may have init packets to send before we can send user commands */
+ if (xpad_prepare_next_init_packet(xpad))
+ return true;
+
for (i = 0; i < XPAD_NUM_OUT_PACKETS; i++) {
if (++xpad->last_out_packet >= XPAD_NUM_OUT_PACKETS)
xpad->last_out_packet = 0;
@@ -938,24 +1033,17 @@ static int xpad_inquiry_pad_presence(struct usb_xpad *xpad)

static int xpad_start_xbox_one(struct usb_xpad *xpad)
{
- struct xpad_output_packet *packet =
- &xpad->out_packets[XPAD_OUT_CMD_IDX];
unsigned long flags;
int retval;

spin_lock_irqsave(&xpad->odata_lock, flags);

- /* Xbox one controller needs to be initialized. */
- packet->data[0] = 0x05;
- packet->data[1] = 0x20;
- packet->data[2] = xpad->odata_serial++; /* packet serial */
- packet->data[3] = 0x01; /* rumble bit enable? */
- packet->data[4] = 0x00;
- packet->len = 5;
- packet->pending = true;
-
- /* Reset the sequence so we send out start packet first */
- xpad->last_out_packet = -1;
+ /*
+ * Begin the init sequence by attempting to send a packet.
+ * We will cycle through the init packet sequence before
+ * sending any packets from the output ring.
+ */
+ xpad->init_seq = 0;
retval = xpad_try_sending_next_out_packet(xpad);

spin_unlock_irqrestore(&xpad->odata_lock, flags);
--
2.9.3
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