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diff --git a/drivers/hid/hid-input.c b/drivers/hid/hid-input.c
index 9d80635a91eb..8c8a7483261f 100644
--- a/drivers/hid/hid-input.c
+++ b/drivers/hid/hid-input.c
@@ -14,6 +14,7 @@
*/
#include <linux/module.h>
+#include <linux/moduleparam.h>
#include <linux/slab.h>
#include <linux/kernel.h>
@@ -1505,6 +1506,87 @@ static void hid_report_set_tool(struct hid_report *report, struct input_dev *inp
report->tool = new_tool;
}
+struct fastmouse_state {
+ int division;
+ long x, y;
+ int rise, run;
+};
+static struct fastmouse_state fastmouse = {
+ .division = 1,
+ .x = 0,
+ .y = 0,
+ .rise = 0,
+ .run = INT_MAX,
+};
+
+static int set_division(const char *val, const struct kernel_param *kp) {
+ const int ret = kstrtoint(val, 0, &fastmouse.division);
+ if (ret != 0 || fastmouse.division <= 0) {
+ return -EINVAL;
+ }
+ return ret;
+}
+static const struct kernel_param_ops division_ops = {
+ .set = set_division,
+ .get = param_get_int,
+};
+module_param_cb(division, &division_ops, &fastmouse.division, 0664);
+MODULE_PARM_DESC(division, "Mouse movement division amount (default: 1)");
+
+static int set_rise(const char *val, const struct kernel_param *kp) {
+ const int ret = kstrtoint(val, 0, &fastmouse.rise);
+ if (ret != 0) {
+ return -EINVAL;
+ }
+ return ret;
+}
+static const struct kernel_param_ops rise_ops = {
+ .set = set_rise,
+ .get = param_get_int,
+};
+module_param_cb(rise, &rise_ops, &fastmouse.rise, 0664);
+MODULE_PARM_DESC(rise, "Mouse movement rise amount (default: 0)");
+
+static int set_run(const char *val, const struct kernel_param *kp) {
+ const int ret = kstrtoint(val, 0, &fastmouse.run);
+ if (ret != 0) {
+ return -EINVAL;
+ }
+ return ret;
+}
+static const struct kernel_param_ops run_ops = {
+ .set = set_run,
+ .get = param_get_int,
+};
+module_param_cb(run, &run_ops, &fastmouse.run, 0664);
+MODULE_PARM_DESC(run, "Mouse movement run amount (default: INT_MAX)");
+
+static void fastmouse_handle_motion(const long in_x, const long in_y) {
+ const long rise = fastmouse.rise / fastmouse.division;
+ const long run = fastmouse.run / fastmouse.division;
+ fastmouse.x += in_x * run - in_y * rise;
+ fastmouse.y += in_x * rise + in_y * run;
+}
+
+static void input_event_fastmouse(struct input_dev *input, const unsigned int type, const unsigned int code, __s32 value) {
+ const long in_x = (code == REL_X) * value;
+ const long in_y = (code == REL_Y) * value;
+
+ fastmouse_handle_motion(in_x, in_y);
+
+ const long emit_x = fastmouse.x / INT_MAX;
+ if (emit_x != 0) {
+ input_event(input, type, REL_X, emit_x);
+ }
+ const long emit_y = fastmouse.y / INT_MAX;
+ if (emit_y != 0) {
+ input_event(input, type, REL_Y, emit_y);
+ }
+
+ fastmouse.x %= INT_MAX;
+ fastmouse.y %= INT_MAX;
+}
+
void hidinput_hid_event(struct hid_device *hid, struct hid_field *field, struct hid_usage *usage, __s32 value)
{
struct input_dev *input;
@@ -1713,7 +1795,12 @@ void hidinput_hid_event(struct hid_device *hid, struct hid_field *field, struct
(!test_bit(usage->code, input->key)) == value)
input_event(input, EV_MSC, MSC_SCAN, usage->hid);
- input_event(input, usage->type, usage->code, value);
+ if (hid->type == HID_TYPE_USBMOUSE && usage->type == EV_REL) {
+ input_event_fastmouse(input, usage->type, usage->code, value);
+ } else {
+ input_event(input, usage->type, usage->code, value);
+ }
+
if ((field->flags & HID_MAIN_ITEM_RELATIVE) &&
usage->type == EV_KEY && value) {
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