path: root/include/linux/libps2.h
diff options
authorDmitry Torokhov <dmitry.torokhov@gmail.com>2018-01-17 12:00:24 -0800
committerDmitry Torokhov <dmitry.torokhov@gmail.com>2018-02-02 16:50:28 -0800
commit29acc42e8e10a4721757af9ed8aec569d30ce39b (patch)
treeec5af27e25a76eae0f376029f93755032f253711 /include/linux/libps2.h
parentInput: libps2 - support retransmission of command data (diff)
Input: libps2 - relax command byte ACK handling
When we probe PS/2 devices we first issue "Get ID" command and only if we receive what we consider a valid keyboard or mouse ID we disable the device and continue with protocol detection. That means that the device may be transmitting motion or keystroke data, while we expect ACK response. Instead of signaling failure if we see anything but ACK/NAK let's ignore "garbage" response until we see ACK for the command byte (first byte). The checks for subsequent ACKs of command parameters will continue be strict. Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Diffstat (limited to 'include/linux/libps2.h')
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/libps2.h b/include/linux/libps2.h
index 3c69cd796f48..5f18fe02ae37 100644
--- a/include/linux/libps2.h
+++ b/include/linux/libps2.h
@@ -31,6 +31,7 @@
#define PS2_FLAG_CMD1 BIT(2) /* Waiting for the first byte of command response */
#define PS2_FLAG_WAITID BIT(3) /* Command executing is GET ID */
#define PS2_FLAG_NAK BIT(4) /* Last transmission was NAKed */
+#define PS2_FLAG_ACK_CMD BIT(5) /* Waiting to ACK the command (first) byte */
struct ps2dev {
struct serio *serio;