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authorChase Douglas <chase.douglas@canonical.com>2010-06-21 05:32:30 +0400
committerJiri Kosina <jkosina@suse.cz>2010-06-24 12:49:39 +0400
commit0b778e76c1e7ccf49f8980b594e72f984095fd26 (patch)
tree54b14fb5a51c63c83dc332990cf3d34988837d34 /drivers/hid/hid-magicmouse.c
parent8d93efb27ab8927ffc7a357f1b2d10039de50ed4 (diff)
downloadlinux-0b778e76c1e7ccf49f8980b594e72f984095fd26.tar.xz
HID: magicmouse: add param for scroll speed
The new scroll_speed param takes an integer value from 0 to 63, where 0 is slowest and 63 is fastest. The default of 32 remains the same. This parameter also affects scroll acceleration linearly. A second part of this change is a tightly coupled modification to the scroll acceleration. Previously, scroll acceleration could be reset without lifting the scroll finger. This is rather unintuitive and hard to control in the case where a user wants faster scrolling, but wants to hold the scroll touch for longer than a moment. Note that scroll acceleration levels are now 1-7, where 7 is slowest. In the previous implementation, there were 8 levels defined, but it was impossible to start at the slowest level. In order to keep the default scroll speed unchanged, only 7 levels are used now. Signed-off-by: Chase Douglas <chase.douglas@canonical.com> Acked-by: Michael Poole <mdpoole@troilus.org> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Diffstat (limited to 'drivers/hid/hid-magicmouse.c')
-rw-r--r--drivers/hid/hid-magicmouse.c43
1 files changed, 28 insertions, 15 deletions
diff --git a/drivers/hid/hid-magicmouse.c b/drivers/hid/hid-magicmouse.c
index f44aaf21e1e2..fe0c760d7e6e 100644
--- a/drivers/hid/hid-magicmouse.c
+++ b/drivers/hid/hid-magicmouse.c
@@ -30,6 +30,17 @@ static bool emulate_scroll_wheel = true;
module_param(emulate_scroll_wheel, bool, 0644);
MODULE_PARM_DESC(emulate_scroll_wheel, "Emulate a scroll wheel");
+static unsigned int scroll_speed = 32;
+static int param_set_scroll_speed(const char *val, struct kernel_param *kp) {
+ unsigned long speed;
+ if (!val || strict_strtoul(val, 0, &speed) || speed > 63)
+ return -EINVAL;
+ scroll_speed = speed;
+ return 0;
+}
+module_param_call(scroll_speed, param_set_scroll_speed, param_get_uint, &scroll_speed, 0644);
+MODULE_PARM_DESC(scroll_speed, "Scroll speed, value from 0 (slow) to 63 (fast)");
+
static bool scroll_acceleration = false;
module_param(scroll_acceleration, bool, 0644);
MODULE_PARM_DESC(scroll_acceleration, "Accelerate sequential scroll events");
@@ -54,6 +65,8 @@ MODULE_PARM_DESC(report_undeciphered, "Report undeciphered multi-touch state fie
#define TOUCH_STATE_START 0x30
#define TOUCH_STATE_DRAG 0x40
+#define SCROLL_ACCEL_DEFAULT 7
+
/**
* struct magicmouse_sc - Tracks Magic Mouse-specific data.
* @input: Input device through which we report events.
@@ -145,7 +158,7 @@ static void magicmouse_emit_buttons(struct magicmouse_sc *msc, int state)
input_report_key(msc->input, BTN_RIGHT, state & 2);
if (state != last_state)
- msc->scroll_accel = 0;
+ msc->scroll_accel = SCROLL_ACCEL_DEFAULT;
}
static void magicmouse_emit_touch(struct magicmouse_sc *msc, int raw_id, u8 *tdata)
@@ -167,30 +180,28 @@ static void magicmouse_emit_touch(struct magicmouse_sc *msc, int raw_id, u8 *tda
* vertical touch motions.
*/
if (emulate_scroll_wheel) {
- static const int accel_profile[] = {
- 256, 228, 192, 160, 128, 96, 64, 32,
- };
unsigned long now = jiffies;
int step = msc->touches[id].scroll_y - y;
- /* Reset acceleration after half a second. */
- if (time_after(now, msc->scroll_jiffies + HZ / 2))
- msc->scroll_accel = 0;
-
/* Calculate and apply the scroll motion. */
switch (tdata[7] & TOUCH_STATE_MASK) {
case TOUCH_STATE_START:
msc->touches[id].scroll_y = y;
- if (scroll_acceleration)
- msc->scroll_accel = min_t(int,
- msc->scroll_accel + 1,
- ARRAY_SIZE(accel_profile) - 1);
+
+ /* Reset acceleration after half a second. */
+ if (scroll_acceleration && time_before(now,
+ msc->scroll_jiffies + HZ / 2))
+ msc->scroll_accel = max_t(int,
+ msc->scroll_accel - 1, 1);
+ else
+ msc->scroll_accel = SCROLL_ACCEL_DEFAULT;
+
break;
case TOUCH_STATE_DRAG:
- step = step / accel_profile[msc->scroll_accel];
+ step /= (64 - (int)scroll_speed) * msc->scroll_accel;
if (step != 0) {
- msc->touches[id].scroll_y -=
- step * accel_profile[msc->scroll_accel];
+ msc->touches[id].scroll_y -= step *
+ (64 - scroll_speed) * msc->scroll_accel;
msc->scroll_jiffies = now;
input_report_rel(input, REL_WHEEL, step);
}
@@ -351,6 +362,8 @@ static int magicmouse_probe(struct hid_device *hdev,
return -ENOMEM;
}
+ msc->scroll_accel = SCROLL_ACCEL_DEFAULT;
+
msc->quirks = id->driver_data;
hid_set_drvdata(hdev, msc);