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Commit e5606230 authored by Frank Praznik's avatar Frank Praznik Committed by Jiri Kosina
Browse files

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



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: default avatarFrank Praznik <frank.praznik@oh.rr.com>
Signed-off-by: default avatarJiri Kosina <jkosina@suse.cz>
parent d902f472

drivers/hid/hid-sony.c

+54 −0
Original line number Diff line number Diff line
@@ -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;