/*      $NetBSD: adb_bus.c,v 1.14 2025/06/16 07:51:16 macallan Exp $ */

/*-
* Copyright (c) 2006 Michael Lorenz
* 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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>
__KERNEL_RCSID(0, "$NetBSD: adb_bus.c,v 1.14 2025/06/16 07:51:16 macallan Exp $");

#include <sys/param.h>
#include <sys/device.h>
#include <sys/condvar.h>

#include <machine/autoconf.h>
#include <dev/adb/adbvar.h>

#include "adbdebug.h"

#ifdef ADB_DEBUG
#define DPRINTF printf
#else
#define DPRINTF while (0) printf
#endif

static int nadb_match(device_t, cfdata_t, void *);
static void nadb_attach(device_t, device_t, void *);

struct nadb_softc {
       device_t sc_dev;
       struct adb_bus_accessops *sc_ops;
       uint32_t sc_msg;
       kcondvar_t sc_event;
       kmutex_t sc_interlock;
       struct adb_device sc_devtable[16];
       int sc_free;    /* highest free address */
       int sc_len;     /* length of received message */
       uint8_t sc_data[16];
};

CFATTACH_DECL_NEW(nadb, sizeof(struct nadb_softc),
   nadb_match, nadb_attach, NULL, NULL);

static void nadb_init(device_t);
static void nadb_handler(void *, int, uint8_t *);
static void nadb_send_sync(void *, int, int, uint8_t *);
static int nadb_register(struct nadb_softc *, int, int, int);
static void nadb_remove(struct nadb_softc *, int);
static int nadb_devprint(void *, const char *);

static int
nadb_match(device_t parent, cfdata_t cf, void *aux)
{

       return 1;
}

static void
nadb_attach(device_t parent, device_t self, void *aux)
{
       struct nadb_softc *sc = device_private(self);
       struct adb_bus_accessops *ops = aux;

       sc->sc_dev = self;
       sc->sc_ops = ops;
       sc->sc_ops->set_handler(sc->sc_ops->cookie, nadb_handler, sc);

       mutex_init(&sc->sc_interlock, MUTEX_DEFAULT, IPL_NONE);
       cv_init(&sc->sc_event, "adbbus");

       config_interrupts(self, nadb_init);
}

static void
nadb_init(device_t dev)
{
       struct nadb_softc *sc = device_private(dev);
       struct adb_attach_args aaa;
       int i, last_moved_up, devmask = 0;
       uint8_t cmd[2];

       sc->sc_free = 15;
       for (i = 0; i < 16; i++) {
               sc->sc_devtable[i].original_addr = 0;
               sc->sc_devtable[i].current_addr = 0;
               sc->sc_devtable[i].handler_id = 0;
               sc->sc_devtable[i].cookie = NULL;
               sc->sc_devtable[i].handler = NULL;
       }

       /* bus reset (?) */
       nadb_send_sync(sc, 0, 0, NULL);
       delay(200000);

       /*
        * scan only addresses 1 - 7
        * if something responds move it to >7 and see if something else is
        * there. If not move the previous one back.
        * XXX we don't check for collisions if we use up all addresses >7
        */
       for (i = 1; i < 8; i++) {
               DPRINTF("\n%d: ", i);
               last_moved_up = 0;
               nadb_send_sync(sc, ADBTALK(i, 3), 0, NULL);
               /* found something? */
               while (sc->sc_len > 2) {
                       /* something answered, so move it up */

                       DPRINTF("Found a device on address %d\n", i);
                       cmd[0] = sc->sc_free | 0x60;
                       cmd[1] = 0xfe;
                       nadb_send_sync(sc, ADBLISTEN(i, 3), 2, cmd);

                       /* see if it really moved */
                       nadb_send_sync(sc, ADBTALK(sc->sc_free, 3), 0, NULL);
                       if (sc->sc_len > 2) {
                               /* ok */
                               DPRINTF("moved it to %d\n", sc->sc_free);
                               nadb_register(sc, sc->sc_free, i, sc->sc_data[3]);
                               last_moved_up = sc->sc_free;
                               sc->sc_free--;
                       }
                       /* see if something else is there */
                       nadb_send_sync(sc, ADBTALK(i, 3), 0, NULL);
               }
               if (last_moved_up != 0) {
                       /* move last one back to original address */
                       cmd[0] = i | 0x60;
                       cmd[1] = 0xfe;
                       nadb_send_sync(sc, ADBLISTEN(last_moved_up, 3), 2, cmd);

                       nadb_send_sync(sc, ADBTALK(i, 3), 0, NULL);
                       if (sc->sc_len > 2) {
                               DPRINTF("moved %d back to %d\n", last_moved_up, i);
                               nadb_remove(sc, last_moved_up);
                               nadb_register(sc, i, i, sc->sc_data[3]);
                               sc->sc_free = last_moved_up;
                       }
               }
       }

       /* now attach the buggers we've found */
       aaa.ops = sc->sc_ops;
       for (i = 0; i < 16; i++) {
               if (sc->sc_devtable[i].current_addr != 0) {
                       DPRINTF("dev: %d %d %02x\n",
                           sc->sc_devtable[i].current_addr,
                           sc->sc_devtable[i].original_addr,
                           sc->sc_devtable[i].handler_id);
                       aaa.dev = &sc->sc_devtable[i];
                       if (config_found(sc->sc_dev, &aaa, nadb_devprint,
                                        CFARGS_NONE)) {
                               devmask |= (1 << i);
                       } else {
                               aprint_normal(" not configured\n");
                       }
               }
       }
       /* now enable autopolling */
       DPRINTF("devmask: %04x\n", devmask);
       sc->sc_ops->autopoll(sc->sc_ops->cookie, devmask);
}

int
nadb_print(void *aux, const char *what)
{
       aprint_normal(": Apple Desktop Bus\n");
       return 0;
}

static int
nadb_devprint(void *aux, const char *what)
{
       struct adb_attach_args *aaa = aux;

       if (what == NULL)
               return 0;

       switch(aaa->dev->original_addr) {
               case ADBADDR_KBD:
                       aprint_normal("%s: ADB Keyboard", what);
                       break;
               case ADBADDR_MS:
                       aprint_normal("%s: ADB relative pointing device", what);
                       break;
               default:
                       aprint_normal("%s: something from address %d:%02x",
                           what,
                           aaa->dev->original_addr,
                           aaa->dev->handler_id);
                       break;
       }
       return 0;
}

static void
nadb_handler(void *cookie, int len, uint8_t *data)
{
       struct nadb_softc *sc = cookie;
       struct adb_device *dev;
       int addr;

#ifdef ADB_DEBUG
       int i;
       printf("adb:");
       for (i = 0; i < len; i++) {
               printf(" %02x", data[i]);
       }
       printf("\n");
#endif

       addr = data[1] >> 4;
       dev  = &sc->sc_devtable[addr];
       if ((dev->current_addr != 0) && (dev->handler != NULL)) {

               dev->handler(dev->cookie, len, data);
       } else {
               sc->sc_msg = 1;
               sc->sc_len = len;
               memcpy(sc->sc_data, data, len);
               cv_signal(&sc->sc_event);
       }
}

static void
nadb_send_sync(void *cookie, int command, int len, uint8_t *data)
{
       struct nadb_softc *sc = cookie;

       sc->sc_msg = 0;
       mutex_enter(&sc->sc_interlock);
       sc->sc_ops->send(sc->sc_ops->cookie, 0, command, len, data);
       while (sc->sc_msg == 0) {
               cv_timedwait(&sc->sc_event, &sc->sc_interlock, hz);
       }
       mutex_exit(&sc->sc_interlock);
}

static int
nadb_register(struct nadb_softc *sc, int current, int orig, int handler)
{
       struct adb_device *dev;

       if ((current > 0) && (current < 16)) {
               dev = &sc->sc_devtable[current];
               if (dev->current_addr != 0)
                       /* in use! */
                       return -1;
               dev->current_addr = current;
               dev->original_addr = orig;
               dev->handler_id = handler;
               return 0;
       }
       return -1;
}

static void
nadb_remove(struct nadb_softc *sc, int addr)
{

       if ((addr > 0) && (addr < 16)) {
               sc->sc_devtable[addr].current_addr = 0;
               sc->sc_devtable[addr].original_addr = 0;
               sc->sc_devtable[addr].handler_id = 0;
       }
}

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