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HID: wiimote: Parse motion+ data 

Motion+ reports rotation gyro data which we report to userspace as ABS_RX/Y/Z
values. The device reports them either in fast or slow mode. We adjust the
values to get a linear scale so userspace does not need to know about slow and
fast mode.

The motion+ also reports whether an extension is connected to it. We keep track
of this value and reinitialize the extensions if an extension is plugged or
unplugged.

Signed-off-by: David Herrmann <dh.herrmann@googlemail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
This commit is contained in:
David Herrmann 2011-11-17 14:12:07 +01:00 committed by Jiri Kosina
parent 0b6815d75d
commit b17b57a5d0
1 changed files with 70 additions and 0 deletions
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70
drivers/hid/hid-wiimote-ext.c
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@ -25,6 +25,7 @@ struct wiimote_ext {
atomic_t opened;
atomic_t mp_opened;
bool plugged;
bool mp_plugged;
bool motionp;
__u8 ext_type;
};
@ -182,6 +183,10 @@ void wiiext_event(struct wiimote_data *wdata, bool plugged)
return;
wdata->ext->plugged = plugged;
if (!plugged)
wdata->ext->mp_plugged = false;
/*
* We need to call wiiext_schedule(wdata->ext) here, however, the
* extension initialization logic is not fully understood and so
@ -206,6 +211,63 @@ bool wiiext_active(struct wiimote_data *wdata)
static void handler_motionp(struct wiimote_ext *ext, const __u8 *payload)
{
__s32 x, y, z;
bool plugged;
/* | 8 7 6 5 4 3 | 2 | 1 |
* -----+------------------------------+-----+-----+
* 1 | Yaw Speed <7:0> |
* 2 | Roll Speed <7:0> |
* 3 | Pitch Speed <7:0> |
* -----+------------------------------+-----+-----+
* 4 | Yaw Speed <13:8> | Yaw |Pitch|
* -----+------------------------------+-----+-----+
* 5 | Roll Speed <13:8> |Roll | Ext |
* -----+------------------------------+-----+-----+
* 6 | Pitch Speed <13:8> | 1 | 0 |
* -----+------------------------------+-----+-----+
* The single bits Yaw, Roll, Pitch in the lower right corner specify
* whether the wiimote is rotating fast (0) or slow (1). Speed for slow
* roation is 440 deg/s and for fast rotation 2000 deg/s. To get a
* linear scale we multiply by 2000/440 = ~4.5454 which is 18 for fast
* and 9 for slow.
* If the wiimote is not rotating the sensor reports 2^13 = 8192.
* Ext specifies whether an extension is connected to the motionp.
*/
x = payload[0];
y = payload[1];
z = payload[2];
x |= (((__u16)payload[3]) << 6) & 0xff00;
y |= (((__u16)payload[4]) << 6) & 0xff00;
z |= (((__u16)payload[5]) << 6) & 0xff00;
x -= 8192;
y -= 8192;
z -= 8192;
if (!(payload[3] & 0x02))
x *= 18;
else
x *= 9;
if (!(payload[4] & 0x02))
y *= 18;
else
y *= 9;
if (!(payload[3] & 0x01))
z *= 18;
else
z *= 9;
input_report_abs(ext->mp_input, ABS_RX, x);
input_report_abs(ext->mp_input, ABS_RY, y);
input_report_abs(ext->mp_input, ABS_RZ, z);
input_sync(ext->mp_input);
plugged = payload[5] & 0x01;
if (plugged != ext->mp_plugged)
ext->mp_plugged = plugged;
}
static void handler_nunchuck(struct wiimote_ext *ext, const __u8 *payload)
@ -368,6 +430,14 @@ int wiiext_init(struct wiimote_data *wdata)
ext->mp_input->id.version = wdata->hdev->version;
ext->mp_input->name = WIIMOTE_NAME " Motion+";
set_bit(EV_ABS, ext->mp_input->evbit);
set_bit(ABS_RX, ext->mp_input->absbit);
set_bit(ABS_RY, ext->mp_input->absbit);
set_bit(ABS_RZ, ext->mp_input->absbit);
input_set_abs_params(ext->mp_input, ABS_RX, -160000, 160000, 4, 8);
input_set_abs_params(ext->mp_input, ABS_RY, -160000, 160000, 4, 8);
input_set_abs_params(ext->mp_input, ABS_RZ, -160000, 160000, 4, 8);
ret = input_register_device(ext->mp_input);
if (ret) {
input_free_device(ext->mp_input);