xref: /freebsd-11-stable/sys/arm/broadcom/bcm2835/bcm2835_ft5406.c

/*-
 * Copyright (C) 2016 Oleksandr Tymoshenko <gonzo@freebsd.org>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 */

#include <sys/cdefs.h>
__FBSDID("$FreeBSD: stable/11/sys/arm/broadcom/bcm2835/bcm2835_ft5406.c 307767 2016-10-22 02:37:59Z gonzo $");

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/bus.h>
#include <sys/cpu.h>
#include <sys/kernel.h>
#include <sys/lock.h>
#include <sys/malloc.h>
#include <sys/module.h>
#include <sys/mutex.h>
#include <sys/condvar.h>
#include <sys/sysctl.h>
#include <sys/selinfo.h>
#include <sys/poll.h>
#include <sys/uio.h>
#include <sys/conf.h>
#include <sys/kthread.h>

#include <vm/vm.h>
#include <vm/pmap.h>

#include <dev/fdt/fdt_common.h>
#include <dev/ofw/ofw_bus.h>
#include <dev/ofw/ofw_bus_subr.h>

#include <dev/evdev/input.h>
#include <dev/evdev/evdev.h>

#include <machine/bus.h>
#include <machine/cpu.h>
#include <machine/intr.h>

#include <arm/broadcom/bcm2835/bcm2835_mbox.h>
#include <arm/broadcom/bcm2835/bcm2835_mbox_prop.h>
#include <arm/broadcom/bcm2835/bcm2835_vcbus.h>

#include "mbox_if.h"

#ifdef DEBUG
#define DPRINTF(fmt, ...) do {			\
	printf("%s:%u: ", __func__, __LINE__);	\
	printf(fmt, ##__VA_ARGS__);		\
} while (0)
#else
#define DPRINTF(fmt, ...)
#endif

#define	FT5406_LOCK(_sc)		\
	mtx_lock(&(_sc)->sc_mtx)
#define	FT5406_UNLOCK(_sc)		\
	mtx_unlock(&(_sc)->sc_mtx)
#define	FT5406_LOCK_INIT(_sc)	\
	mtx_init(&_sc->sc_mtx, device_get_nameunit(_sc->sc_dev), \
	    "ft5406", MTX_DEF)
#define	FT5406_LOCK_DESTROY(_sc)	\
	mtx_destroy(&_sc->sc_mtx);
#define	FT5406_LOCK_ASSERT(_sc)	\
	mtx_assert(&(_sc)->sc_mtx, MA_OWNED)

#define	FT5406_DEVICE_MODE	0
#define	FT5406_GESTURE_ID	1
#define	FT5406_NUM_POINTS	2
#define	FT5406_POINT_XH(n)	(0 + 3 + (n)*6)
#define	FT5406_POINT_XL(n)	(1 + 3 + (n)*6)
#define	FT5406_POINT_YH(n)	(2 + 3 + (n)*6)
#define	FT5406_POINT_YL(n)	(3 + 3 + (n)*6)
#define	FT5406_WINDOW_SIZE	64

#define	GET_NUM_POINTS(buf)	(buf[FT5406_NUM_POINTS])
#define	GET_X(buf, n)		(((buf[FT5406_POINT_XH(n)] & 0xf) << 8) | \
				    (buf[FT5406_POINT_XL(n)]))
#define	GET_Y(buf, n)		(((buf[FT5406_POINT_YH(n)] & 0xf) << 8) | \
				    (buf[FT5406_POINT_YL(n)]))
#define	GET_TOUCH_ID(buf, n)	((buf[FT5406_POINT_YH(n)] >> 4) & 0xf)

#define	NO_POINTS	99
#define	SCREEN_WIDTH	800
#define	SCREEN_HEIGHT	480

struct ft5406ts_softc {
	device_t		sc_dev;
	struct mtx		sc_mtx;
	struct proc		*sc_worker;

	/* mbox buffer (mapped to KVA) */
	uint8_t			*touch_buf;

	/* initial hook for waiting mbox intr */
	struct intr_config_hook	sc_init_hook;

	struct evdev_dev	*sc_evdev;
	int			sc_detaching;
};

static void
ft5406ts_worker(void *data)
{
	struct ft5406ts_softc *sc = (struct ft5406ts_softc *)data;
	int points;
	int id, new_x, new_y, i, new_pen_down, updated;
	int x, y, pen_down;
	uint8_t window[FT5406_WINDOW_SIZE];
	int tick;

	/* 60Hz */
	tick = hz*17/1000;
	if (tick == 0)
		tick = 1;

	x = y = -1;
	pen_down = 0;

	FT5406_LOCK(sc);
	while(1) {
		msleep(sc, &sc->sc_mtx, PCATCH | PZERO, "ft5406ts", tick);

		if (sc->sc_detaching)
			break;

		memcpy(window, sc->touch_buf, sizeof(window));
		sc->touch_buf[FT5406_NUM_POINTS] = NO_POINTS;

		points = GET_NUM_POINTS(window);
		/*
		 * No update from VC - do nothing
		 */
		if (points == NO_POINTS)
			continue;

		/* No points and pen is already up */
		if ((points == 0) && !pen_down)
			continue;

		new_pen_down = 0;
		for (i = 0; i < points; i++) {
			id = GET_TOUCH_ID(window, 0);
			/* For now consider only touch 0 */
			if (id != 0)
				continue;
			new_pen_down = 1;
			new_x = GET_X(window, 0);
			new_y = GET_Y(window, 0);
		}

		updated = 0;

		if (new_x != x) {
			x = new_x;
			updated = 1;
		}

		if (new_y != y) {
			y = new_y;
			updated = 1;
		}

		if (new_pen_down != pen_down) {
			pen_down = new_pen_down;
			updated = 1;
		}

		if (updated) {
			evdev_push_event(sc->sc_evdev, EV_ABS, ABS_X, x);
			evdev_push_event(sc->sc_evdev, EV_ABS, ABS_Y, y);
			evdev_push_event(sc->sc_evdev, EV_KEY, BTN_TOUCH, pen_down);
			evdev_sync(sc->sc_evdev);
		}
	}
	FT5406_UNLOCK(sc);

	kproc_exit(0);
}

static void
ft5406ts_init(void *arg)
{
	struct ft5406ts_softc *sc = arg;
	struct bcm2835_mbox_tag_touchbuf msg;
	uint32_t touchbuf;
	int err;

	/* release this hook (continue boot) */
	config_intrhook_disestablish(&sc->sc_init_hook);

	memset(&msg, 0, sizeof(msg));
	msg.hdr.buf_size = sizeof(msg);
	msg.hdr.code = BCM2835_MBOX_CODE_REQ;
	msg.tag_hdr.tag = BCM2835_MBOX_TAG_GET_TOUCHBUF;
	msg.tag_hdr.val_buf_size = sizeof(msg.body);
	msg.tag_hdr.val_len = sizeof(msg.body);
	msg.end_tag = 0;

	/* call mailbox property */
	err = bcm2835_mbox_property(&msg, sizeof(msg));
	if (err) {
		device_printf(sc->sc_dev, "failed to get touchbuf address\n");
		return;
	}

	if (msg.body.resp.address == 0) {
		device_printf(sc->sc_dev, "touchscreen not detected\n");
		return;
	}

	touchbuf = VCBUS_TO_PHYS(msg.body.resp.address);
	sc->touch_buf = (uint8_t*)pmap_mapdev(touchbuf, FT5406_WINDOW_SIZE);

	sc->sc_evdev = evdev_alloc();
	evdev_set_name(sc->sc_evdev, device_get_desc(sc->sc_dev));
	evdev_set_phys(sc->sc_evdev, device_get_nameunit(sc->sc_dev));
	evdev_set_id(sc->sc_evdev, BUS_VIRTUAL, 0, 0, 0);
	evdev_support_prop(sc->sc_evdev, INPUT_PROP_DIRECT);
	evdev_support_event(sc->sc_evdev, EV_SYN);
	evdev_support_event(sc->sc_evdev, EV_ABS);
	evdev_support_event(sc->sc_evdev, EV_KEY);

	evdev_support_abs(sc->sc_evdev, ABS_X, 0, 0,
	    SCREEN_WIDTH, 0, 0, 0);
	evdev_support_abs(sc->sc_evdev, ABS_Y, 0, 0,
	    SCREEN_HEIGHT, 0, 0, 0);

	evdev_support_key(sc->sc_evdev, BTN_TOUCH);

	err = evdev_register(sc->sc_evdev);
	if (err) {
		evdev_free(sc->sc_evdev);
		return;
	}

	sc->touch_buf[FT5406_NUM_POINTS] = NO_POINTS;
	if (kproc_create(ft5406ts_worker, (void*)sc, &sc->sc_worker, 0, 0,
	    "ft5406ts_worker") != 0) {
		printf("failed to create ft5406ts_worker\n");
	}
}

static int
ft5406ts_probe(device_t dev)
{

	if (!ofw_bus_is_compatible(dev, "rpi,rpi-ft5406"))
		return (ENXIO);

	device_set_desc(dev, "FT5406 touchscreen (VC memory interface)");

	return (BUS_PROBE_DEFAULT);
}

static int
ft5406ts_attach(device_t dev)
{
	struct ft5406ts_softc *sc;

	/* set self dev */
	sc = device_get_softc(dev);
	sc->sc_dev = dev;

	/* register callback for using mbox when interrupts are enabled */
	sc->sc_init_hook.ich_func = ft5406ts_init;
	sc->sc_init_hook.ich_arg = sc;

	if (config_intrhook_establish(&sc->sc_init_hook) != 0) {
		device_printf(dev, "config_intrhook_establish failed\n");
		return (ENOMEM);
	}

	FT5406_LOCK_INIT(sc);

	return (0);
}

static int
ft5406ts_detach(device_t dev)
{
	struct ft5406ts_softc *sc;

	sc = device_get_softc(dev);

	FT5406_LOCK(sc);
	if (sc->sc_worker)
		sc->sc_detaching = 1;

	if (sc->sc_evdev)
		evdev_free(sc->sc_evdev);
	FT5406_UNLOCK(sc);

	FT5406_LOCK_DESTROY(sc);

	return (0);
}

static device_method_t ft5406ts_methods[] = {
	/* Device interface */
	DEVMETHOD(device_probe,		ft5406ts_probe),
	DEVMETHOD(device_attach,	ft5406ts_attach),
	DEVMETHOD(device_detach,	ft5406ts_detach),

	DEVMETHOD_END
};

static devclass_t ft5406ts_devclass;
static driver_t ft5406ts_driver = {
	"ft5406ts",
	ft5406ts_methods,
	sizeof(struct ft5406ts_softc),
};

DRIVER_MODULE(ft5406ts, ofwbus, ft5406ts_driver, ft5406ts_devclass, 0, 0);