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HID: sony: add output events for the multi-touch pad on the Dualshock 4

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Add output events for the multi-touch pad on the Dualshock 4.

The touchpad has a resolution of 1920x940 and is capable of 2 simultaneous
touches. A 'Type B' stateful slot protocol is implemented as defined in
Documentation/input/multi-touch-protocol.txt

Applications can use the touchpad data by processing the ABS_MT_SLOT,
ABS_MT_TRACKING_ID, ABS_MT_POSITION_X and ABS_MT_POSITION_Y events.

Signed-off-by: Frank Praznik <frank.praznik@oh.rr.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
This commit is contained in:
Frank Praznik 2014-01-27 10:17:37 -05:00 committed by Jiri Kosina
parent d902f4724c
commit e560623050
1 changed files with 54 additions and 0 deletions
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54
drivers/hid/hid-sony.c
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@ -32,6 +32,7 @@
#include <linux/leds.h>
#include <linux/power_supply.h>
#include <linux/spinlock.h>
#include <linux/input/mt.h>
#include "hid-ids.h"
@ -643,7 +644,11 @@ static void sixaxis_parse_report(struct sony_sc *sc, __u8 *rd, int size)
static void dualshock4_parse_report(struct sony_sc *sc, __u8 *rd, int size)
{
struct hid_input *hidinput = list_entry(sc->hdev->inputs.next,
struct hid_input, list);
struct input_dev *input_dev = hidinput->input;
unsigned long flags;
int n, offset = 35;
__u8 cable_state, battery_capacity, battery_charging;
/* The lower 4 bits of byte 30 contain the battery level
@ -669,6 +674,28 @@ static void dualshock4_parse_report(struct sony_sc *sc, __u8 *rd, int size)
sc->battery_capacity = battery_capacity;
sc->battery_charging = battery_charging;
spin_unlock_irqrestore(&sc->lock, flags);
/* The Dualshock 4 multi-touch trackpad data starts at offset 35 on USB.
* The first 7 bits of the first byte is a counter and bit 8 is a touch
* indicator that is 0 when pressed and 1 when not pressed.
* The next 3 bytes are two 12 bit touch coordinates, X and Y.
* The data for the second touch is in the same format and immediatly
* follows the data for the first.
*/
for (n = 0; n < 2; n++) {
__u16 x, y;
x = rd[offset+1] | ((rd[offset+2] & 0xF) << 8);
y = ((rd[offset+2] & 0xF0) >> 4) | (rd[offset+3] << 4);
input_mt_slot(input_dev, n);
input_mt_report_slot_state(input_dev, MT_TOOL_FINGER,
!(rd[offset] >> 7));
input_report_abs(input_dev, ABS_MT_POSITION_X, x);
input_report_abs(input_dev, ABS_MT_POSITION_Y, y);
offset += 4;
}
}
static int sony_raw_event(struct hid_device *hdev, struct hid_report *report,
@ -1200,6 +1227,26 @@ static int sony_set_output_report(struct sony_sc *sc, int req_id, int req_size)
return -EINVAL;
}
static int sony_register_touchpad(struct sony_sc *sc, int touch_count,
int w, int h)
{
struct hid_input *hidinput = list_entry(sc->hdev->inputs.next,
struct hid_input, list);
struct input_dev *input_dev = hidinput->input;
int ret;
ret = input_mt_init_slots(input_dev, touch_count, 0);
if (ret < 0) {
hid_err(sc->hdev, "Unable to initialize multi-touch slots\n");
return ret;
}
input_set_abs_params(input_dev, ABS_MT_POSITION_X, 0, w, 0, 0);
input_set_abs_params(input_dev, ABS_MT_POSITION_Y, 0, h, 0, 0);
return 0;
}
static int sony_probe(struct hid_device *hdev, const struct hid_device_id *id)
{
int ret;
@ -1249,6 +1296,13 @@ static int sony_probe(struct hid_device *hdev, const struct hid_device_id *id)
if (ret < 0)
goto err_stop;
/* The Dualshock 4 touchpad supports 2 touches and has a
* resolution of 1920x940.
*/
ret = sony_register_touchpad(sc, 2, 1920, 940);
if (ret < 0)
goto err_stop;
INIT_WORK(&sc->state_worker, dualshock4_state_worker);
} else {
ret = 0;