/* $NetBSD: dtv_device.c,v 1.14 2022/03/31 19:30:15 pgoyette Exp $ */

/*-
* Copyright (c) 2011 Jared D. McNeill <[email protected]>
* 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.
* 3. All advertising materials mentioning features or use of this software
*    must display the following acknowledgement:
*        This product includes software developed by Jared D. McNeill.
* 4. Neither the name of The NetBSD Foundation nor the names of its
*    contributors may be used to endorse or promote products derived
*    from this software without specific prior written permission.
*
* 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: dtv_device.c,v 1.14 2022/03/31 19:30:15 pgoyette Exp $");

#include <sys/param.h>
#include <sys/types.h>
#include <sys/atomic.h>
#include <sys/conf.h>
#include <sys/device.h>
#include <sys/module.h>
#include <sys/poll.h>
#include <sys/select.h>

#include <dev/dtv/dtvvar.h>

#include "ioconf.h"

MODULE(MODULE_CLASS_DRIVER, dtv, NULL);

static dev_type_open(dtvopen);
static dev_type_close(dtvclose);
static dev_type_read(dtvread);
static dev_type_ioctl(dtvioctl);
static dev_type_poll(dtvpoll);

const struct cdevsw dtv_cdevsw = {
       .d_open = dtvopen,
       .d_close = dtvclose,
       .d_read = dtvread,
       .d_write = nowrite,
       .d_ioctl = dtvioctl,
       .d_stop = nostop,
       .d_tty = notty,
       .d_poll = dtvpoll,
       .d_mmap = nommap,
       .d_kqfilter = nokqfilter,
       .d_discard = nodiscard,
       .d_flag = D_OTHER | D_MPSAFE,
};

static int      dtv_match(device_t, cfdata_t, void *);
static void     dtv_attach(device_t, device_t, void *);
static int      dtv_detach(device_t, int);

CFATTACH_DECL_NEW(dtv,
   sizeof(struct dtv_softc),
   dtv_match,
   dtv_attach,
   dtv_detach,
   NULL
);

static int
dtv_match(device_t parent, cfdata_t cfdata, void *aa)
{
       return 1;
}

static void
dtv_attach(device_t parent, device_t self, void *aa)
{
       struct dtv_attach_args *daa = aa;
       struct dtv_softc *sc = device_private(self);
       struct dtv_stream *ds = &sc->sc_stream;
       struct dvb_frontend_info info;

       sc->sc_dev = self;
       sc->sc_hw = daa->hw;
       sc->sc_priv = daa->priv;
       sc->sc_open = 0;
       mutex_init(&sc->sc_lock, MUTEX_DEFAULT, IPL_NONE);

       ds->ds_nbufs = 0;
       ds->ds_buf = NULL;
       SIMPLEQ_INIT(&ds->ds_ingress);
       SIMPLEQ_INIT(&ds->ds_egress);
       mutex_init(&ds->ds_egress_lock, MUTEX_DEFAULT, IPL_SCHED);
       mutex_init(&ds->ds_ingress_lock, MUTEX_DEFAULT, IPL_SCHED);
       cv_init(&ds->ds_sample_cv, "dtv");
       selinit(&ds->ds_sel);
       dtv_scatter_buf_init(&ds->ds_data);
       if (dtv_buffer_realloc(sc, DTV_DEFAULT_BUFSIZE) != 0) {
               aprint_error(": no memory\n");
               sc->sc_dying = true;
               return;
       }

       mutex_init(&sc->sc_demux_lock, MUTEX_DEFAULT, IPL_SCHED);
       TAILQ_INIT(&sc->sc_demux_list);
       sc->sc_demux_runcnt = 0;

       dtv_device_get_devinfo(sc, &info);

       aprint_naive("\n");
       aprint_normal(": %s", info.name);
       switch (info.type) {
       case FE_QPSK:
               aprint_normal(" [QPSK]");
               break;
       case FE_QAM:
               aprint_normal(" [QAM]");
               break;
       case FE_OFDM:
               aprint_normal(" [OFDM]");
               break;
       case FE_ATSC:
               aprint_normal(" [ATSC]");
               break;
       }
       aprint_normal("\n");
}

static int
dtv_detach(device_t self, int flags)
{
       struct dtv_softc *sc = device_private(self);
       struct dtv_stream *ds = &sc->sc_stream;

       cv_destroy(&ds->ds_sample_cv);
       mutex_destroy(&ds->ds_ingress_lock);
       mutex_destroy(&ds->ds_egress_lock);
       seldestroy(&ds->ds_sel);
       dtv_buffer_realloc(sc, 0);
       dtv_scatter_buf_destroy(&ds->ds_data);

       mutex_destroy(&sc->sc_demux_lock);
       mutex_destroy(&sc->sc_lock);

       return 0;
}

#ifdef _MODULE
#include "ioconf.c"
#endif

static int
dtv_modcmd(modcmd_t cmd, void *arg)
{
#ifdef _MODULE
       int error, bmaj = -1, cmaj = -1;
#endif

       switch (cmd) {
       case MODULE_CMD_INIT:
#ifdef _MODULE
               error = devsw_attach("dtv", NULL, &bmaj, &dtv_cdevsw, &cmaj);
               if (error)
                       return error;

               error = config_init_component(cfdriver_ioconf_dtv,
                   cfattach_ioconf_dtv, cfdata_ioconf_dtv);
               if (error)
                       devsw_detach(NULL, &dtv_cdevsw);
               return error;
#else
               return 0;
#endif
       case MODULE_CMD_FINI:
#ifdef _MODULE
               error = config_fini_component(cfdriver_ioconf_dtv,
                   cfattach_ioconf_dtv, cfdata_ioconf_dtv);
               if (error == 0)
                       devsw_detach(NULL, &dtv_cdevsw);

               return error;
#else
               return 0;
#endif
       default:
               return ENOTTY;
       }
}

static int
dtvopen(dev_t dev, int flags, int mode, lwp_t *l)
{
       struct dtv_softc *sc;
       struct dtv_ts *ts;
       int error;

       if ((sc = device_lookup_private(&dtv_cd, DTVUNIT(dev))) == NULL)
               return ENXIO;
       if (sc->sc_dying == true)
               return ENODEV;
       ts = &sc->sc_ts;

       mutex_enter(&sc->sc_lock);
       if (sc->sc_open == 0) {
               error = dtv_device_open(sc, flags);
               if (error)
                       return error;
               sc->sc_bufsize = DTV_DEFAULT_BUFSIZE;
               sc->sc_bufsize_chg = true;
               memset(ts->ts_pidfilter, 0, sizeof(ts->ts_pidfilter));
       }
       ++sc->sc_open;
       mutex_exit(&sc->sc_lock);

       if (ISDTVDEMUX(dev))
               return dtv_demux_open(sc, flags, mode, l);

       return 0;
}

static int
dtvclose(dev_t dev, int flags, int mode, lwp_t *l)
{
       struct dtv_softc *sc;

       if ((sc = device_lookup_private(&dtv_cd, DTVUNIT(dev))) == NULL)
               return ENXIO;

       dtv_common_close(sc);

       return 0;
}

static int
dtvread(dev_t dev, struct uio *uio, int flags)
{
       struct dtv_softc *sc;

       if ((sc = device_lookup_private(&dtv_cd, DTVUNIT(dev))) == NULL)
               return ENXIO;

       if (ISDTVDVR(dev))
               return dtv_buffer_read(sc, uio, flags);

       return ENXIO;
}

static int
dtvioctl(dev_t dev, u_long cmd, void *ptr, int flags, lwp_t *l)
{
       struct dtv_softc *sc;

       if ((sc = device_lookup_private(&dtv_cd, DTVUNIT(dev))) == NULL)
               return ENXIO;

       if (ISDTVFRONTEND(dev)) {
               return dtv_frontend_ioctl(sc, cmd, ptr, flags);
       }

       return EINVAL;
}

static int
dtvpoll(dev_t dev, int events, lwp_t *l)
{
       struct dtv_softc *sc;

       if ((sc = device_lookup_private(&dtv_cd, DTVUNIT(dev))) == NULL)
               return POLLERR;

       if (ISDTVFRONTEND(dev)) {
               return POLLPRI|POLLIN; /* XXX event */
       } else if (ISDTVDVR(dev)) {
               return dtv_buffer_poll(sc, events, l);
       }

       return POLLERR;
}

void
dtv_common_close(struct dtv_softc *sc)
{
       mutex_enter(&sc->sc_lock);
       KASSERT(sc->sc_open > 0);
       --sc->sc_open;
       if (sc->sc_open == 0) {
               dtv_device_close(sc);
               dtv_buffer_destroy(sc);
       }
       mutex_exit(&sc->sc_lock);
}

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