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HID: usbhid: extend polling interval configuration to joysticks

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For mouse devices we can currently change the polling interval
via usbhid.mousepoll. Implement the same thing for joysticks, so
users can reduce input latency this way.

This has been tested with a Logitech RumblePad 2 with jspoll=2,
resulting in a polling rate of 500Hz (verified with evhz).

Signed-off-by: Tobias Jakobi <tjakobi@math.uni-bielefeld.de>
Acked-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
This commit is contained in:
Tobias Jakobi 2017-02-25 20:27:27 +01:00 committed by Jiri Kosina
parent 81bbef23db
commit 933bfe4d27
2 changed files with 18 additions and 3 deletions
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3
Documentation/admin-guide/kernel-parameters.txt
View file

@ -4085,6 +4085,9 @@
usbhid.mousepoll=
[USBHID] The interval which mice are to be polled at.
usbhid.jspoll=
[USBHID] The interval which joysticks 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).

18
drivers/hid/usbhid/hid-core.c
View file

@ -52,6 +52,10 @@ static unsigned int hid_mousepoll_interval;
module_param_named(mousepoll, hid_mousepoll_interval, uint, 0644);
MODULE_PARM_DESC(mousepoll, "Polling interval of mice");
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 ignoreled;
module_param_named(ignoreled, ignoreled, uint, 0644);
MODULE_PARM_DESC(ignoreled, "Autosuspend with active leds");
@ -1081,9 +1085,17 @@ static int usbhid_start(struct hid_device *hid)
hid->name, endpoint->bInterval, interval);
}
/* Change the polling interval of mice. */
if (hid->collection->usage == HID_GD_MOUSE && hid_mousepoll_interval > 0)
interval = hid_mousepoll_interval;
/* Change the polling interval of mice and joysticks. */
switch (hid->collection->usage) {
case HID_GD_MOUSE:
if (hid_mousepoll_interval > 0)
interval = hid_mousepoll_interval;
break;
case HID_GD_JOYSTICK:
if (hid_jspoll_interval > 0)
interval = hid_jspoll_interval;
break;
}
ret = -ENOMEM;
if (usb_endpoint_dir_in(endpoint)) {