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 <tjakobi@math.uni-bielefeld.de>
Acked-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

2 files changed, 18 insertions, 3 deletions

diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
index 635d11135090..14ffef04113c 100644
--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -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).
diff --git a/drivers/hid/usbhid/hid-core.c b/drivers/hid/usbhid/hid-core.c
index 961bc6fdd2d9..b06fee1b8e47 100644
--- a/drivers/hid/usbhid/hid-core.c
+++ b/drivers/hid/usbhid/hid-core.c
@@ -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)) {