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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>
This commit is contained in:
Chase Douglas 2010-06-20 21:32:30 -04:00 committed by Jiri Kosina
parent 8d93efb27a
commit 0b778e76c1
1 changed files with 28 additions and 15 deletions
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43
drivers/hid/hid-magicmouse.c
View File

@ -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);