/* $NetBSD: auvitek_dtv.c,v 1.10 2022/03/13 12:49:36 riastradh 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.
*
* 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.
*/

/*
* Auvitek AU0828 USB controller (Digital TV function)
*/

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: auvitek_dtv.c,v 1.10 2022/03/13 12:49:36 riastradh Exp $");

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/device.h>
#include <sys/conf.h>
#include <sys/kmem.h>
#include <sys/bus.h>

#include <dev/usb/usb.h>
#include <dev/usb/usbdi.h>
#include <dev/usb/usbdivar.h>
#include <dev/usb/usbdi_util.h>
#include <dev/usb/usbdevs.h>

#include <dev/dtv/dtvif.h>

#include <dev/usb/auvitekreg.h>
#include <dev/usb/auvitekvar.h>

static void             auvitek_dtv_get_devinfo(void *,
                           struct dvb_frontend_info *);
static int              auvitek_dtv_open(void *, int);
static void             auvitek_dtv_close(void *);
static int              auvitek_dtv_set_tuner(void *,
                           const struct dvb_frontend_parameters *);
static fe_status_t      auvitek_dtv_get_status(void *);
static uint16_t         auvitek_dtv_get_signal_strength(void *);
static uint16_t         auvitek_dtv_get_snr(void *);
static int              auvitek_dtv_start_transfer(void *,
                           void (*)(void *, const struct dtv_payload *),
                           void *);
static int              auvitek_dtv_stop_transfer(void *);

static int              auvitek_dtv_init_pipes(struct auvitek_softc *);
static int              auvitek_dtv_abort_pipes(struct auvitek_softc *);
static int              auvitek_dtv_close_pipes(struct auvitek_softc *);

static int              auvitek_dtv_bulk_start(struct auvitek_softc *);
static int              auvitek_dtv_bulk_start1(struct auvitek_bulk_xfer *);
static void             auvitek_dtv_bulk_cb(struct usbd_xfer *, void *,
                           usbd_status);

static const struct dtv_hw_if auvitek_dtv_if = {
       .get_devinfo = auvitek_dtv_get_devinfo,
       .open = auvitek_dtv_open,
       .close = auvitek_dtv_close,
       .set_tuner = auvitek_dtv_set_tuner,
       .get_status = auvitek_dtv_get_status,
       .get_signal_strength = auvitek_dtv_get_signal_strength,
       .get_snr = auvitek_dtv_get_snr,
       .start_transfer = auvitek_dtv_start_transfer,
       .stop_transfer = auvitek_dtv_stop_transfer,
};

int
auvitek_dtv_attach(struct auvitek_softc *sc)
{

       auvitek_dtv_rescan(sc, NULL, NULL);

       return sc->sc_dtvdev != NULL;
}

int
auvitek_dtv_detach(struct auvitek_softc *sc, int flags)
{

       return 0;
}

void
auvitek_dtv_rescan(struct auvitek_softc *sc, const char *ifattr,
   const int *locs)
{
       struct dtv_attach_args daa;

       daa.hw = &auvitek_dtv_if;
       daa.priv = sc;

       if (ifattr_match(ifattr, "dtvbus") && sc->sc_dtvdev == NULL)
               sc->sc_dtvdev = config_found(sc->sc_dev, &daa, dtv_print,
                   CFARGS(.iattr = "dtvbus"));
}

void
auvitek_dtv_childdet(struct auvitek_softc *sc, device_t child)
{
       if (sc->sc_dtvdev == child)
               sc->sc_dtvdev = NULL;
}

static void
auvitek_dtv_get_devinfo(void *priv, struct dvb_frontend_info *info)
{
       struct auvitek_softc *sc = priv;

       memset(info, 0, sizeof(*info));
       strlcpy(info->name, sc->sc_descr, sizeof(info->name));
       info->type = FE_ATSC;
       info->frequency_min = 54000000;
       info->frequency_max = 858000000;
       info->frequency_stepsize = 62500;
       info->caps = FE_CAN_QAM_64 | FE_CAN_QAM_256 | FE_CAN_8VSB;
}

static int
auvitek_dtv_open(void *priv, int flags)
{
       struct auvitek_softc *sc = priv;

       if (sc->sc_dying)
               return EIO;

       auvitek_attach_tuner(sc->sc_dev);
       if (sc->sc_xc5k == NULL)
               return ENXIO;

       int err = auvitek_dtv_init_pipes(sc);
       if (err)
               return err;

       for (size_t i = 0; i < AUVITEK_NBULK_XFERS; i++) {
               sc->sc_ab.ab_bx[i].bx_sc = sc;
               err = usbd_create_xfer(sc->sc_ab.ab_pipe,
                   AUVITEK_BULK_BUFLEN, 0, 0, &sc->sc_ab.ab_bx[i].bx_xfer);
               if (err) {
                       aprint_error_dev(sc->sc_dev,
                           "couldn't allocate xfer\n");
                       sc->sc_dying = 1;
                       return err;
               }
               sc->sc_ab.ab_bx[i].bx_buffer = usbd_get_buffer(
                   sc->sc_ab.ab_bx[i].bx_xfer);
       }


       return 0;
}

static void
auvitek_dtv_close(void *priv)
{
       struct auvitek_softc *sc = priv;

       auvitek_dtv_stop_transfer(sc);
       auvitek_dtv_abort_pipes(sc);

       for (size_t i = 0; i < AUVITEK_NBULK_XFERS; i++) {
               if (sc->sc_ab.ab_bx[i].bx_xfer)
                       usbd_destroy_xfer(sc->sc_ab.ab_bx[i].bx_xfer);
       }

       auvitek_dtv_close_pipes(sc);

       sc->sc_dtvsubmitcb = NULL;
       sc->sc_dtvsubmitarg = NULL;
}

static int
auvitek_dtv_set_tuner(void *priv, const struct dvb_frontend_parameters *params)
{
       struct auvitek_softc *sc = priv;
       int error;

       error = au8522_set_modulation(sc->sc_au8522, params->u.vsb.modulation);
       if (error)
               return error;

       delay(100000);

       au8522_set_gate(sc->sc_au8522, true);
       error = xc5k_tune_dtv(sc->sc_xc5k, params);
       au8522_set_gate(sc->sc_au8522, false);

       return error;
}

fe_status_t
auvitek_dtv_get_status(void *priv)
{
       struct auvitek_softc *sc = priv;

       return au8522_get_dtv_status(sc->sc_au8522);
}

uint16_t
auvitek_dtv_get_signal_strength(void *priv)
{
       return auvitek_dtv_get_snr(priv);
}

uint16_t
auvitek_dtv_get_snr(void *priv)
{
       struct auvitek_softc *sc = priv;

       return au8522_get_snr(sc->sc_au8522);
}

static int
auvitek_dtv_start_transfer(void *priv,
   void (*cb)(void *, const struct dtv_payload *), void *arg)
{
       struct auvitek_softc *sc = priv;
       int s;

       if (sc->sc_ab.ab_running) {
               return 0;
       }

       sc->sc_dtvsubmitcb = cb;
       sc->sc_dtvsubmitarg = arg;

       auvitek_write_1(sc, 0x608, 0x90);
       auvitek_write_1(sc, 0x609, 0x72);
       auvitek_write_1(sc, 0x60a, 0x71);
       auvitek_write_1(sc, 0x60b, 0x01);

       sc->sc_ab.ab_running = true;

       s = splusb();
       auvitek_dtv_bulk_start(sc);
       splx(s);

       return 0;
}

static int
auvitek_dtv_stop_transfer(void *priv)
{
       struct auvitek_softc *sc = priv;

       sc->sc_ab.ab_running = false;

       auvitek_write_1(sc, 0x608, 0x00);
       auvitek_write_1(sc, 0x609, 0x00);
       auvitek_write_1(sc, 0x60a, 0x00);
       auvitek_write_1(sc, 0x60b, 0x00);

       return 0;
}

static int
auvitek_dtv_init_pipes(struct auvitek_softc *sc)
{
       usbd_status err;

       KERNEL_LOCK(1, curlwp);
       err = usbd_open_pipe(sc->sc_bulk_iface, sc->sc_ab.ab_endpt,
           USBD_EXCLUSIVE_USE|USBD_MPSAFE, &sc->sc_ab.ab_pipe);
       KERNEL_UNLOCK_ONE(curlwp);

       if (err) {
               aprint_error_dev(sc->sc_dev, "couldn't open bulk-in pipe: %s\n",
                   usbd_errstr(err));
               return ENOMEM;
       }

       return 0;
}

static int
auvitek_dtv_abort_pipes(struct auvitek_softc *sc)
{
       if (sc->sc_ab.ab_pipe != NULL) {
               KERNEL_LOCK(1, curlwp);
               usbd_abort_pipe(sc->sc_ab.ab_pipe);
               KERNEL_UNLOCK_ONE(curlwp);
       }

       return 0;
}

static int
auvitek_dtv_close_pipes(struct auvitek_softc *sc)
{
       if (sc->sc_ab.ab_pipe != NULL) {
               KERNEL_LOCK(1, curlwp);
               usbd_close_pipe(sc->sc_ab.ab_pipe);
               KERNEL_UNLOCK_ONE(curlwp);
               sc->sc_ab.ab_pipe = NULL;
       }

       return 0;
}

static void
auvitek_dtv_bulk_cb(struct usbd_xfer *xfer, void *priv,
   usbd_status status)
{
       struct auvitek_bulk_xfer *bx = priv;
       struct auvitek_softc *sc = bx->bx_sc;
       struct auvitek_bulk *ab = &sc->sc_ab;
       struct dtv_payload payload;
       uint32_t xferlen;

       if (ab->ab_running == false || sc->sc_dtvsubmitcb == NULL)
               return;

       usbd_get_xfer_status(xfer, NULL, NULL, &xferlen, NULL);

       //printf("%s: status=%d xferlen=%u\n", __func__, status, xferlen);

       if (status != USBD_NORMAL_COMPLETION) {
               printf("%s: USB error (%s)\n", __func__, usbd_errstr(status));
               if (status == USBD_STALLED) {
                       usbd_clear_endpoint_stall_async(ab->ab_pipe);
                       goto next;
               }
               if (status == USBD_SHORT_XFER) {
                       goto next;
               }
               return;
       }

       if (xferlen == 0) {
               printf("%s: 0-length xfer\n", __func__);
               goto next;
       }

       payload.data = bx->bx_buffer;
       payload.size = xferlen;
       sc->sc_dtvsubmitcb(sc->sc_dtvsubmitarg, &payload);

next:
       auvitek_dtv_bulk_start1(bx);
}

static int
auvitek_dtv_bulk_start(struct auvitek_softc *sc)
{
       int i, error;

       for (i = 0; i < AUVITEK_NBULK_XFERS; i++) {
               error = auvitek_dtv_bulk_start1(&sc->sc_ab.ab_bx[i]);
               if (error)
                       return error;
       }

       return 0;
}

static int
auvitek_dtv_bulk_start1(struct auvitek_bulk_xfer *bx)
{
       struct auvitek_softc *sc = bx->bx_sc;
       usbd_status err;

       usbd_setup_xfer(bx->bx_xfer, bx, bx->bx_buffer, AUVITEK_BULK_BUFLEN,
           0 /* USBD_SHORT_XFER_OK */, 100 /* USBD_NO_TIMEOUT */,
           auvitek_dtv_bulk_cb);

       KERNEL_LOCK(1, curlwp);
       err = usbd_transfer(bx->bx_xfer);
       KERNEL_UNLOCK_ONE(curlwp);

       if (err != USBD_IN_PROGRESS) {
               aprint_error_dev(sc->sc_dev, "USB error: %s\n",
                   usbd_errstr(err));
               return ENODEV;
       }

       return 0;
}

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