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HID: wiimote: Parse nunchuck data

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The Nintendo Nunchuck extension reports accelerometer values, one analog stick
and two buttons. See inline comments for data layout.
We report all data to userspace through extension input device.

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 14:12:08 +01:00 committed by Jiri Kosina
parent b17b57a5d0
commit a53535014b
1 changed files with 104 additions and 1 deletions
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105
drivers/hid/hid-wiimote-ext.c
View file

@ -36,6 +36,17 @@ enum wiiext_type {
WIIEXT_NUNCHUCK, /* Nintendo nunchuck controller */
};
enum wiiext_keys {
WIIEXT_KEY_C,
WIIEXT_KEY_Z,
WIIEXT_KEY_COUNT
};
static __u16 wiiext_keymap[] = {
BTN_C, /* WIIEXT_KEY_C */
BTN_Z, /* WIIEXT_KEY_Z */
};
/* diable all extensions */
static void ext_disable(struct wiimote_ext *ext)
{
@ -272,6 +283,82 @@ static void handler_motionp(struct wiimote_ext *ext, const __u8 *payload)
static void handler_nunchuck(struct wiimote_ext *ext, const __u8 *payload)
{
__s16 x, y, z, bx, by;
/* Byte | 8 7 | 6 5 | 4 3 | 2 | 1 |
* -----+----------+---------+---------+----+-----+
* 1 | Button X <7:0> |
* 2 | Button Y <7:0> |
* -----+----------+---------+---------+----+-----+
* 3 | Speed X <9:2> |
* 4 | Speed Y <9:2> |
* 5 | Speed Z <9:2> |
* -----+----------+---------+---------+----+-----+
* 6 | Z <1:0> | Y <1:0> | X <1:0> | BC | BZ |
* -----+----------+---------+---------+----+-----+
* Button X/Y is the analog stick. Speed X, Y and Z are the
* accelerometer data in the same format as the wiimote's accelerometer.
* The 6th byte contains the LSBs of the accelerometer data.
* BC and BZ are the C and Z buttons: 0 means pressed
*
* If reported interleaved with motionp, then the layout changes. The
* 5th and 6th byte changes to:
* -----+-----------------------------------+-----+
* 5 | Speed Z <9:3> | EXT |
* -----+--------+-----+-----+----+----+----+-----+
* 6 |Z <2:1> |Y <1>|X <1>| BC | BZ | 0 | 0 |
* -----+--------+-----+-----+----+----+----+-----+
* All three accelerometer values lose their LSB. The other data is
* still available but slightly moved.
*
* Center data for button values is 128. Center value for accelerometer
* values it 512 / 0x200
*/
bx = payload[0];
by = payload[1];
bx -= 128;
by -= 128;
x = payload[2] << 2;
y = payload[3] << 2;
z = payload[4] << 2;
if (ext->motionp) {
x |= (payload[5] >> 3) & 0x02;
y |= (payload[5] >> 4) & 0x02;
z &= ~0x4;
z |= (payload[5] >> 5) & 0x06;
} else {
x |= (payload[5] >> 2) & 0x03;
y |= (payload[5] >> 4) & 0x03;
z |= (payload[5] >> 6) & 0x03;
}
x -= 0x200;
y -= 0x200;
z -= 0x200;
input_report_abs(ext->input, ABS_HAT0X, bx);
input_report_abs(ext->input, ABS_HAT0Y, by);
input_report_abs(ext->input, ABS_RX, x);
input_report_abs(ext->input, ABS_RY, y);
input_report_abs(ext->input, ABS_RZ, z);
if (ext->motionp) {
input_report_key(ext->input,
wiiext_keymap[WIIEXT_KEY_Z], !!(payload[5] & 0x04));
input_report_key(ext->input,
wiiext_keymap[WIIEXT_KEY_C], !!(payload[5] & 0x08));
} else {
input_report_key(ext->input,
wiiext_keymap[WIIEXT_KEY_Z], !!(payload[5] & 0x01));
input_report_key(ext->input,
wiiext_keymap[WIIEXT_KEY_C], !!(payload[5] & 0x02));
}
input_sync(ext->input);
}
static void handler_classic(struct wiimote_ext *ext, const __u8 *payload)
@ -383,7 +470,7 @@ int wiiext_init(struct wiimote_data *wdata)
{
struct wiimote_ext *ext;
unsigned long flags;
int ret;
int ret, i;
ext = kzalloc(sizeof(*ext), GFP_KERNEL);
if (!ext)
@ -408,6 +495,22 @@ int wiiext_init(struct wiimote_data *wdata)
ext->input->id.version = wdata->hdev->version;
ext->input->name = WIIMOTE_NAME " Extension";
set_bit(EV_KEY, ext->input->evbit);
for (i = 0; i < WIIEXT_KEY_COUNT; ++i)
set_bit(wiiext_keymap[i], ext->input->keybit);
set_bit(EV_ABS, ext->input->evbit);
set_bit(ABS_HAT0X, ext->input->absbit);
set_bit(ABS_HAT0Y, ext->input->absbit);
input_set_abs_params(ext->input, ABS_HAT0X, -120, 120, 2, 4);
input_set_abs_params(ext->input, ABS_HAT0Y, -120, 120, 2, 4);
set_bit(ABS_RX, ext->input->absbit);
set_bit(ABS_RY, ext->input->absbit);
set_bit(ABS_RZ, ext->input->absbit);
input_set_abs_params(ext->input, ABS_RX, -500, 500, 2, 4);
input_set_abs_params(ext->input, ABS_RY, -500, 500, 2, 4);
input_set_abs_params(ext->input, ABS_RZ, -500, 500, 2, 4);
ret = input_register_device(ext->input);
if (ret) {
input_free_device(ext->input);