335 lines
8.8 KiB
C
335 lines
8.8 KiB
C
/*-
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* Copyright (C) 2016 Oleksandr Tymoshenko <gonzo@freebsd.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/bus.h>
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#include <sys/cpu.h>
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#include <sys/kernel.h>
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#include <sys/lock.h>
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#include <sys/malloc.h>
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#include <sys/module.h>
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#include <sys/mutex.h>
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#include <sys/condvar.h>
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#include <sys/sysctl.h>
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#include <sys/selinfo.h>
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#include <sys/poll.h>
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#include <sys/uio.h>
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#include <sys/conf.h>
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#include <vm/vm.h>
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#include <vm/pmap.h>
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#include <dev/ofw/ofw_bus.h>
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#include <dev/ofw/ofw_bus_subr.h>
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#include <dev/evdev/input.h>
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#include <dev/evdev/evdev.h>
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#include <machine/bus.h>
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#include <machine/cpu.h>
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#include <machine/intr.h>
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#include <arm/broadcom/bcm2835/bcm2835_mbox.h>
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#include <arm/broadcom/bcm2835/bcm2835_mbox_prop.h>
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#include <arm/broadcom/bcm2835/bcm2835_vcbus.h>
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#include "mbox_if.h"
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#ifdef DEBUG
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#define DPRINTF(fmt, ...) do { \
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printf("%s:%u: ", __func__, __LINE__); \
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printf(fmt, ##__VA_ARGS__); \
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} while (0)
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#else
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#define DPRINTF(fmt, ...)
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#endif
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#define FT5406_LOCK(_sc) \
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mtx_lock(&(_sc)->sc_mtx)
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#define FT5406_UNLOCK(_sc) \
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mtx_unlock(&(_sc)->sc_mtx)
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#define FT5406_LOCK_INIT(_sc) \
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mtx_init(&_sc->sc_mtx, device_get_nameunit(_sc->sc_dev), \
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"ft5406", MTX_DEF)
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#define FT5406_LOCK_DESTROY(_sc) \
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mtx_destroy(&_sc->sc_mtx);
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#define FT5406_LOCK_ASSERT(_sc) \
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mtx_assert(&(_sc)->sc_mtx, MA_OWNED)
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#define FT5406_DEVICE_MODE 0
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#define FT5406_GESTURE_ID 1
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#define FT5406_NUM_POINTS 2
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#define FT5406_POINT_XH(n) (0 + 3 + (n)*6)
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#define FT5406_POINT_XL(n) (1 + 3 + (n)*6)
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#define FT5406_POINT_YH(n) (2 + 3 + (n)*6)
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#define FT5406_POINT_YL(n) (3 + 3 + (n)*6)
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#define FT5406_WINDOW_SIZE 64
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#define GET_NUM_POINTS(buf) (buf[FT5406_NUM_POINTS])
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#define GET_X(buf, n) (((buf[FT5406_POINT_XH(n)] & 0xf) << 8) | \
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(buf[FT5406_POINT_XL(n)]))
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#define GET_Y(buf, n) (((buf[FT5406_POINT_YH(n)] & 0xf) << 8) | \
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(buf[FT5406_POINT_YL(n)]))
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#define GET_TOUCH_ID(buf, n) ((buf[FT5406_POINT_YH(n)] >> 4) & 0xf)
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#define NO_POINTS 99
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#define SCREEN_WIDTH 800
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#define SCREEN_HEIGHT 480
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#define SCREEN_WIDTH_MM 155
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#define SCREEN_HEIGHT_MM 86
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#define SCREEN_RES_X (SCREEN_WIDTH / SCREEN_WIDTH_MM)
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#define SCREEN_RES_Y (SCREEN_HEIGHT / SCREEN_HEIGHT_MM)
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#define MAX_TOUCH_ID (10 - 1)
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struct ft5406ts_softc {
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device_t sc_dev;
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struct mtx sc_mtx;
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int sc_tick;
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struct callout sc_callout;
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/* mbox buffer (mapped to KVA) */
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uint8_t *touch_buf;
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/* initial hook for waiting mbox intr */
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struct intr_config_hook sc_init_hook;
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struct evdev_dev *sc_evdev;
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uint8_t sc_window[FT5406_WINDOW_SIZE];
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};
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static evdev_open_t ft5406ts_ev_open;
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static evdev_close_t ft5406ts_ev_close;
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static const struct evdev_methods ft5406ts_evdev_methods = {
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.ev_open = &ft5406ts_ev_open,
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.ev_close = &ft5406ts_ev_close,
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};
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static void
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ft5406ts_callout(void *data)
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{
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struct ft5406ts_softc *sc = (struct ft5406ts_softc *)data;
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int points;
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int id, i, x, y;
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FT5406_LOCK_ASSERT(sc);
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memcpy(sc->sc_window, sc->touch_buf, FT5406_WINDOW_SIZE);
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sc->touch_buf[FT5406_NUM_POINTS] = NO_POINTS;
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points = GET_NUM_POINTS(sc->sc_window);
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/*
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* No update from VC - do nothing.
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*/
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if (points == NO_POINTS)
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goto out;
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for (i = 0; i < points; i++) {
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id = GET_TOUCH_ID(sc->sc_window, i);
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x = GET_X(sc->sc_window, i);
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y = GET_Y(sc->sc_window, i);
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if (id > MAX_TOUCH_ID) {
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device_printf(sc->sc_dev, "bad touch id: %d", id);
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continue;
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}
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evdev_push_event(sc->sc_evdev, EV_ABS, ABS_MT_SLOT, id);
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evdev_push_event(sc->sc_evdev, EV_ABS, ABS_MT_TRACKING_ID, id);
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evdev_push_event(sc->sc_evdev, EV_ABS, ABS_MT_POSITION_X, x);
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evdev_push_event(sc->sc_evdev, EV_ABS, ABS_MT_POSITION_Y, y);
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}
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evdev_sync(sc->sc_evdev);
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out:
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callout_reset(&sc->sc_callout, sc->sc_tick, ft5406ts_callout, sc);
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}
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static void
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ft5406ts_ev_close(struct evdev_dev *evdev, void *data)
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{
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struct ft5406ts_softc *sc = (struct ft5406ts_softc *)data;
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FT5406_LOCK_ASSERT(sc);
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callout_stop(&sc->sc_callout);
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}
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static int
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ft5406ts_ev_open(struct evdev_dev *evdev, void *data)
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{
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struct ft5406ts_softc *sc = (struct ft5406ts_softc *)data;
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FT5406_LOCK_ASSERT(sc);
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callout_reset(&sc->sc_callout, sc->sc_tick, ft5406ts_callout, sc);
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return (0);
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}
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static void
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ft5406ts_init(void *arg)
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{
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struct ft5406ts_softc *sc = arg;
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struct bcm2835_mbox_tag_touchbuf msg;
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uint32_t touchbuf;
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int err;
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/* release this hook (continue boot) */
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config_intrhook_disestablish(&sc->sc_init_hook);
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memset(&msg, 0, sizeof(msg));
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msg.hdr.buf_size = sizeof(msg);
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msg.hdr.code = BCM2835_MBOX_CODE_REQ;
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msg.tag_hdr.tag = BCM2835_MBOX_TAG_GET_TOUCHBUF;
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msg.tag_hdr.val_buf_size = sizeof(msg.body);
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msg.tag_hdr.val_len = sizeof(msg.body);
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msg.end_tag = 0;
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/* call mailbox property */
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err = bcm2835_mbox_property(&msg, sizeof(msg));
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if (err) {
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device_printf(sc->sc_dev, "failed to get touchbuf address\n");
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return;
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}
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if (msg.body.resp.address == 0) {
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device_printf(sc->sc_dev, "touchscreen not detected\n");
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return;
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}
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touchbuf = VCBUS_TO_PHYS(msg.body.resp.address);
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sc->touch_buf = (uint8_t*)pmap_mapdev(touchbuf, FT5406_WINDOW_SIZE);
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/* 60Hz */
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sc->sc_tick = hz * 17 / 1000;
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if (sc->sc_tick == 0)
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sc->sc_tick = 1;
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sc->sc_evdev = evdev_alloc();
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evdev_set_name(sc->sc_evdev, device_get_desc(sc->sc_dev));
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evdev_set_phys(sc->sc_evdev, device_get_nameunit(sc->sc_dev));
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evdev_set_id(sc->sc_evdev, BUS_HOST, 0, 0, 0);
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evdev_set_methods(sc->sc_evdev, sc, &ft5406ts_evdev_methods);
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evdev_set_flag(sc->sc_evdev, EVDEV_FLAG_MT_STCOMPAT);
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evdev_set_flag(sc->sc_evdev, EVDEV_FLAG_MT_AUTOREL);
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evdev_support_prop(sc->sc_evdev, INPUT_PROP_DIRECT);
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evdev_support_event(sc->sc_evdev, EV_SYN);
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evdev_support_event(sc->sc_evdev, EV_ABS);
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evdev_support_abs(sc->sc_evdev, ABS_MT_SLOT, 0, 0,
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MAX_TOUCH_ID, 0, 0, 0);
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evdev_support_abs(sc->sc_evdev, ABS_MT_TRACKING_ID, 0, -1,
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MAX_TOUCH_ID, 0, 0, 0);
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evdev_support_abs(sc->sc_evdev, ABS_MT_POSITION_X, 0, 0,
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SCREEN_WIDTH, 0, 0, SCREEN_RES_X);
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evdev_support_abs(sc->sc_evdev, ABS_MT_POSITION_Y, 0, 0,
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SCREEN_HEIGHT, 0, 0, SCREEN_RES_Y);
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err = evdev_register_mtx(sc->sc_evdev, &sc->sc_mtx);
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if (err) {
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evdev_free(sc->sc_evdev);
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sc->sc_evdev = NULL; /* Avoid double free */
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return;
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}
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sc->touch_buf[FT5406_NUM_POINTS] = NO_POINTS;
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callout_init_mtx(&sc->sc_callout, &sc->sc_mtx, 0);
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}
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static int
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ft5406ts_probe(device_t dev)
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{
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if (!ofw_bus_is_compatible(dev, "rpi,rpi-ft5406"))
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return (ENXIO);
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device_set_desc(dev, "FT5406 touchscreen (VC memory interface)");
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return (BUS_PROBE_DEFAULT);
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}
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static int
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ft5406ts_attach(device_t dev)
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{
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struct ft5406ts_softc *sc;
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/* set self dev */
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sc = device_get_softc(dev);
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sc->sc_dev = dev;
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/* register callback for using mbox when interrupts are enabled */
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sc->sc_init_hook.ich_func = ft5406ts_init;
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sc->sc_init_hook.ich_arg = sc;
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FT5406_LOCK_INIT(sc);
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if (config_intrhook_establish(&sc->sc_init_hook) != 0) {
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device_printf(dev, "config_intrhook_establish failed\n");
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FT5406_LOCK_DESTROY(sc);
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return (ENOMEM);
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}
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return (0);
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}
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static int
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ft5406ts_detach(device_t dev)
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{
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struct ft5406ts_softc *sc;
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sc = device_get_softc(dev);
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evdev_free(sc->sc_evdev);
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FT5406_LOCK_DESTROY(sc);
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return (0);
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}
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static device_method_t ft5406ts_methods[] = {
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/* Device interface */
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DEVMETHOD(device_probe, ft5406ts_probe),
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DEVMETHOD(device_attach, ft5406ts_attach),
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DEVMETHOD(device_detach, ft5406ts_detach),
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DEVMETHOD_END
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};
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static devclass_t ft5406ts_devclass;
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static driver_t ft5406ts_driver = {
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"ft5406ts",
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ft5406ts_methods,
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sizeof(struct ft5406ts_softc),
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};
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DRIVER_MODULE(ft5406ts, ofwbus, ft5406ts_driver, ft5406ts_devclass, 0, 0);
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MODULE_DEPEND(ft5406ts, evdev, 1, 1, 1);
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