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authorFilip Alac <filipalac@gmail.com>2018-03-21 19:28:25 +0300
committerJiri Kosina <jkosina@suse.cz>2018-03-23 16:48:37 +0300
commit2ddc8e2d2b5902b376fee51585c8eed72b8836e7 (patch)
treeb1b77a503fb105b998b5999ea21c9af10aba24ed
parentc17a7476e4c41884d82e3675c25ceae982c07a63 (diff)
downloadlinux-2ddc8e2d2b5902b376fee51585c8eed72b8836e7.tar.xz
HID: usbhid: extend the polling interval configuration to keyboards
For mouse and joystick devices user can change the polling interval via usbhid.mousepoll and usbhid.jspoll. Implement the same thing for keyboards, so user can reduce(or increase) input latency this way. This has been tested with a Cooler Master Devastator with kbpoll=32, resulting in delay between events of 32 ms(values were taken from evtest). Signed-off-by: Filip Alac <filipalac@gmail.com> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
-rw-r--r--Documentation/admin-guide/kernel-parameters.txt3
-rw-r--r--drivers/hid/usbhid/hid-core.c12
2 files changed, 14 insertions, 1 deletions
diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
index b98048b56ada..e0d825206681 100644
--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -4352,6 +4352,9 @@
usbhid.jspoll=
[USBHID] The interval which joysticks are to be polled at.
+ usbhid.kbpoll=
+ [USBHID] The interval which keyboards are to be polled at.
+
usb-storage.delay_use=
[UMS] The delay in seconds before a new device is
scanned for Logical Units (default 1).
diff --git a/drivers/hid/usbhid/hid-core.c b/drivers/hid/usbhid/hid-core.c
index 77c50cdfff97..af0e0d061b15 100644
--- a/drivers/hid/usbhid/hid-core.c
+++ b/drivers/hid/usbhid/hid-core.c
@@ -56,6 +56,10 @@ static unsigned int hid_jspoll_interval;
module_param_named(jspoll, hid_jspoll_interval, uint, 0644);
MODULE_PARM_DESC(jspoll, "Polling interval of joysticks");
+static unsigned int hid_kbpoll_interval;
+module_param_named(kbpoll, hid_kbpoll_interval, uint, 0644);
+MODULE_PARM_DESC(kbpoll, "Polling interval of keyboards");
+
static unsigned int ignoreled;
module_param_named(ignoreled, ignoreled, uint, 0644);
MODULE_PARM_DESC(ignoreled, "Autosuspend with active leds");
@@ -1094,7 +1098,9 @@ static int usbhid_start(struct hid_device *hid)
hid->name, endpoint->bInterval, interval);
}
- /* Change the polling interval of mice and joysticks. */
+ /* Change the polling interval of mice, joysticks
+ * and keyboards.
+ */
switch (hid->collection->usage) {
case HID_GD_MOUSE:
if (hid_mousepoll_interval > 0)
@@ -1104,6 +1110,10 @@ static int usbhid_start(struct hid_device *hid)
if (hid_jspoll_interval > 0)
interval = hid_jspoll_interval;
break;
+ case HID_GD_KEYBOARD:
+ if (hid_kbpoll_interval > 0)
+ interval = hid_kbpoll_interval;
+ break;
}
ret = -ENOMEM;