From: Tobias Jakobi Date: Sat, 25 Feb 2017 19:27:27 +0000 (+0100) Subject: HID: usbhid: extend polling interval configuration to joysticks X-Git-Tag: archive/raspbian/4.9.51-1+rpi1~5^2~259 X-Git-Url: https://dgit.raspbian.org/?a=commitdiff_plain;h=9eee7d539df10f73cfe26bb4c9efaaa46bef0ea3;p=linux-4.9.git HID: usbhid: extend polling interval configuration to joysticks 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 Acked-by: Benjamin Tissoires Signed-off-by: Jiri Kosina --- diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt index cbe09c71fceb..e056c592419c 100644 --- a/Documentation/kernel-parameters.txt +++ b/Documentation/kernel-parameters.txt @@ -4285,6 +4285,9 @@ bytes respectively. Such letter suffixes can also be entirely omitted. 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). diff --git a/drivers/hid/usbhid/hid-core.c b/drivers/hid/usbhid/hid-core.c index ae83af649a60..f7a692f9e50c 100644 --- a/drivers/hid/usbhid/hid-core.c +++ b/drivers/hid/usbhid/hid-core.c @@ -53,6 +53,10 @@ 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"); @@ -1082,9 +1086,17 @@ 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)) {