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freebsd-skq/sys/arm/broadcom/bcm2835/bcm2835_ft5406.c
gonzo 2a81c79b2c Add multitouch support for RPi's FT5406 
- Add multitouch support (protocol B)
- Report physical size of the screen
- Switch from using busy loop to callbacks
- Enable callbacks only when there is active listener on /dev/input/eventX

Submitted by:	Vladimir Kondratiev <wulf@cicgroup.ru>
2016-10-08 18:19:52 +00:00

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/*-
* 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("$FreeBSD$");
#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 <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
#define SCREEN_WIDTH_MM 155
#define SCREEN_HEIGHT_MM 86
#define SCREEN_RES_X (SCREEN_WIDTH / SCREEN_WIDTH_MM)
#define SCREEN_RES_Y (SCREEN_HEIGHT / SCREEN_HEIGHT_MM)
#define MAX_TOUCH_ID (10 - 1)
struct ft5406ts_softc {
device_t sc_dev;
struct mtx sc_mtx;
int sc_tick;
struct callout sc_callout;
/* 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;
uint8_t sc_window[FT5406_WINDOW_SIZE];
};
static evdev_open_t ft5406ts_ev_open;
static evdev_close_t ft5406ts_ev_close;
static const struct evdev_methods ft5406ts_evdev_methods = {
.ev_open = &ft5406ts_ev_open,
.ev_close = &ft5406ts_ev_close,
};
static void
ft5406ts_callout(void *data)
{
struct ft5406ts_softc *sc = (struct ft5406ts_softc *)data;
int points;
int id, i, x, y;
FT5406_LOCK_ASSERT(sc);
memcpy(sc->sc_window, sc->touch_buf, FT5406_WINDOW_SIZE);
sc->touch_buf[FT5406_NUM_POINTS] = NO_POINTS;
points = GET_NUM_POINTS(sc->sc_window);
/*
* No update from VC - do nothing.
*/
if (points == NO_POINTS)
goto out;
for (i = 0; i < points; i++) {
id = GET_TOUCH_ID(sc->sc_window, i);
x = GET_X(sc->sc_window, i);
y = GET_Y(sc->sc_window, i);
if (id > MAX_TOUCH_ID) {
device_printf(sc->sc_dev, "bad touch id: %d", id);
continue;
}
evdev_push_event(sc->sc_evdev, EV_ABS, ABS_MT_SLOT, id);
evdev_push_event(sc->sc_evdev, EV_ABS, ABS_MT_TRACKING_ID, id);
evdev_push_event(sc->sc_evdev, EV_ABS, ABS_MT_POSITION_X, x);
evdev_push_event(sc->sc_evdev, EV_ABS, ABS_MT_POSITION_Y, y);
}
evdev_sync(sc->sc_evdev);
out:
callout_reset(&sc->sc_callout, sc->sc_tick, ft5406ts_callout, sc);
}
static void
ft5406ts_ev_close(struct evdev_dev *evdev, void *data)
{
struct ft5406ts_softc *sc = (struct ft5406ts_softc *)data;
FT5406_LOCK_ASSERT(sc);
callout_stop(&sc->sc_callout);
}
static int
ft5406ts_ev_open(struct evdev_dev *evdev, void *data)
{
struct ft5406ts_softc *sc = (struct ft5406ts_softc *)data;
FT5406_LOCK_ASSERT(sc);
callout_reset(&sc->sc_callout, sc->sc_tick, ft5406ts_callout, sc);
return (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);
/* 60Hz */
sc->sc_tick = hz * 17 / 1000;
if (sc->sc_tick == 0)
sc->sc_tick = 1;
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_HOST, 0, 0, 0);
evdev_set_methods(sc->sc_evdev, sc, &ft5406ts_evdev_methods);
evdev_set_flag(sc->sc_evdev, EVDEV_FLAG_MT_STCOMPAT);
evdev_set_flag(sc->sc_evdev, EVDEV_FLAG_MT_AUTOREL);
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_abs(sc->sc_evdev, ABS_MT_SLOT, 0, 0,
MAX_TOUCH_ID, 0, 0, 0);
evdev_support_abs(sc->sc_evdev, ABS_MT_TRACKING_ID, 0, -1,
MAX_TOUCH_ID, 0, 0, 0);
evdev_support_abs(sc->sc_evdev, ABS_MT_POSITION_X, 0, 0,
SCREEN_WIDTH, 0, 0, SCREEN_RES_X);
evdev_support_abs(sc->sc_evdev, ABS_MT_POSITION_Y, 0, 0,
SCREEN_HEIGHT, 0, 0, SCREEN_RES_Y);
err = evdev_register_mtx(sc->sc_evdev, &sc->sc_mtx);
if (err) {
evdev_free(sc->sc_evdev);
sc->sc_evdev = NULL; /* Avoid double free */
return;
}
sc->touch_buf[FT5406_NUM_POINTS] = NO_POINTS;
callout_init_mtx(&sc->sc_callout, &sc->sc_mtx, 0);
}
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;
FT5406_LOCK_INIT(sc);
if (config_intrhook_establish(&sc->sc_init_hook) != 0) {
device_printf(dev, "config_intrhook_establish failed\n");
FT5406_LOCK_DESTROY(sc);
return (ENOMEM);
}
return (0);
}
static int
ft5406ts_detach(device_t dev)
{
struct ft5406ts_softc *sc;
sc = device_get_softc(dev);
evdev_free(sc->sc_evdev);
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);
MODULE_DEPEND(ft5406ts, evdev, 1, 1, 1);
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