/*      $NetBSD: udsbr.c,v 1.32 2023/05/10 00:12:36 riastradh Exp $     */

/*
* Copyright (c) 2002 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Lennart Augustsson ([email protected]).
*
* 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.
*/

/*
* Driver for the D-Link DSB-R100 FM radio.
* I apologize for the magic hex constants, but this is what happens
* when you have to reverse engineer the driver.
* Parts of the code borrowed from Linux and parts from Warner Losh's
* FreeBSD driver.
*/

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: udsbr.c,v 1.32 2023/05/10 00:12:36 riastradh Exp $");

#ifdef _KERNEL_OPT
#include "opt_usb.h"
#endif

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/device.h>

#include <sys/radioio.h>
#include <dev/radio_if.h>

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

#include <dev/usb/usbdevs.h>

#ifdef UDSBR_DEBUG
#define DPRINTF(x)      if (udsbrdebug) printf x
#define DPRINTFN(n,x)   if (udsbrdebug>(n)) printf x
int     udsbrdebug = 0;
#else
#define DPRINTF(x)
#define DPRINTFN(n,x)
#endif

#define UDSBR_CONFIG_NO         1

Static  int     udsbr_get_info(void *, struct radio_info *);
Static  int     udsbr_set_info(void *, struct radio_info *);

static const struct radio_hw_if udsbr_hw_if = {
       NULL, /* open */
       NULL, /* close */
       udsbr_get_info,
       udsbr_set_info,
       NULL
};

struct udsbr_softc {
       device_t                sc_dev;
       struct usbd_device *    sc_udev;

       char                    sc_mute;
       char                    sc_vol;
       uint32_t                sc_freq;

       device_t                sc_child;

       char                    sc_dying;
};

Static  int     udsbr_req(struct udsbr_softc *, int, int,
                         int);
Static  void    udsbr_start(struct udsbr_softc *);
Static  void    udsbr_stop(struct udsbr_softc *);
Static  void    udsbr_setfreq(struct udsbr_softc *, int);
Static  int     udsbr_status(struct udsbr_softc *);

static int udsbr_match(device_t, cfdata_t, void *);
static void udsbr_attach(device_t, device_t, void *);
static void udsbr_childdet(device_t, device_t);
static int udsbr_detach(device_t, int);
static int udsbr_activate(device_t, enum devact);

CFATTACH_DECL2_NEW(udsbr, sizeof(struct udsbr_softc), udsbr_match,
   udsbr_attach, udsbr_detach, udsbr_activate, NULL, udsbr_childdet);

static int
udsbr_match(device_t parent, cfdata_t match, void *aux)
{
       struct usb_attach_arg *uaa = aux;

       DPRINTFN(50,("udsbr_match\n"));

       if (uaa->uaa_vendor != USB_VENDOR_CYPRESS ||
           uaa->uaa_product != USB_PRODUCT_CYPRESS_FMRADIO)
               return UMATCH_NONE;
       return UMATCH_VENDOR_PRODUCT;
}

static void
udsbr_attach(device_t parent, device_t self, void *aux)
{
       struct udsbr_softc *sc = device_private(self);
       struct usb_attach_arg *uaa = aux;
       struct usbd_device *    dev = uaa->uaa_device;
       char                    *devinfop;
       usbd_status             err;

       DPRINTFN(10,("udsbr_attach: sc=%p\n", sc));

       sc->sc_dev = self;

       aprint_naive("\n");
       aprint_normal("\n");

       devinfop = usbd_devinfo_alloc(dev, 0);
       aprint_normal_dev(self, "%s\n", devinfop);
       usbd_devinfo_free(devinfop);

       err = usbd_set_config_no(dev, UDSBR_CONFIG_NO, 1);
       if (err) {
               aprint_error_dev(self, "failed to set configuration"
                   ", err=%s\n", usbd_errstr(err));
               return;
       }

       sc->sc_udev = dev;

       DPRINTFN(10, ("udsbr_attach: %p\n", sc->sc_udev));

       usbd_add_drv_event(USB_EVENT_DRIVER_ATTACH, sc->sc_udev, sc->sc_dev);

       sc->sc_child = radio_attach_mi(&udsbr_hw_if, sc, sc->sc_dev);

       return;
}

static void
udsbr_childdet(device_t self, device_t child)
{
}

static int
udsbr_detach(device_t self, int flags)
{
       struct udsbr_softc *sc = device_private(self);
       int error;

       error = config_detach_children(self, flags);
       if (error)
               return error;

       if (sc->sc_udev != NULL)
               usbd_add_drv_event(USB_EVENT_DRIVER_DETACH, sc->sc_udev,
                   sc->sc_dev);

       return 0;
}

static int
udsbr_activate(device_t self, enum devact act)
{
       struct udsbr_softc *sc = device_private(self);

       switch (act) {
       case DVACT_DEACTIVATE:
               sc->sc_dying = 1;
               return 0;
       default:
               return EOPNOTSUPP;
       }
}

int
udsbr_req(struct udsbr_softc *sc, int ureq, int value, int index)
{
       usb_device_request_t req;
       usbd_status err;
       u_char data;

       DPRINTFN(1,("udsbr_req: ureq=0x%02x value=0x%04x index=0x%04x\n",
                   ureq, value, index));
       req.bmRequestType = UT_READ_VENDOR_DEVICE;
       req.bRequest = ureq;
       USETW(req.wValue, value);
       USETW(req.wIndex, index);
       USETW(req.wLength, 1);
       err = usbd_do_request(sc->sc_udev, &req, &data);
       if (err) {
               aprint_error_dev(sc->sc_dev, "request failed err=%d\n", err);
       }
       return !(data & 1);
}

void
udsbr_start(struct udsbr_softc *sc)
{
       (void)udsbr_req(sc, 0x00, 0x0000, 0x00c7);
       (void)udsbr_req(sc, 0x02, 0x0001, 0x0000);
}

void
udsbr_stop(struct udsbr_softc *sc)
{
       (void)udsbr_req(sc, 0x00, 0x0016, 0x001c);
       (void)udsbr_req(sc, 0x02, 0x0000, 0x0000);
}

void
udsbr_setfreq(struct udsbr_softc *sc, int freq)
{
       DPRINTF(("udsbr_setfreq: setfreq=%d\n", freq));
       /*
        * Freq now is in Hz.  We need to convert it to the frequency
        * that the radio wants.  This frequency is 10.7MHz above
        * the actual frequency.  We then need to convert to
        * units of 12.5kHz.  We add one to the IFM to make rounding
        * easier.
        */
       freq = (freq * 1000 + 10700001) / 12500;
       (void)udsbr_req(sc, 0x01, (freq >> 8) & 0xff, freq & 0xff);
       (void)udsbr_req(sc, 0x00, 0x0096, 0x00b7);
       usbd_delay_ms(sc->sc_udev, 240); /* wait for signal to settle */
}

int
udsbr_status(struct udsbr_softc *sc)
{
       return udsbr_req(sc, 0x00, 0x0000, 0x0024);
}


int
udsbr_get_info(void *v, struct radio_info *ri)
{
       struct udsbr_softc *sc = v;

       ri->mute = sc->sc_mute;
       ri->volume = sc->sc_vol ? 255 : 0;
       ri->caps = RADIO_CAPS_DETECT_STEREO;
       ri->rfreq = 0;
       ri->lock = 0;
       ri->freq = sc->sc_freq;
       ri->info = udsbr_status(sc) ? RADIO_INFO_STEREO : 0;

       return 0;
}

int
udsbr_set_info(void *v, struct radio_info *ri)
{
       struct udsbr_softc *sc = v;

       sc->sc_mute = ri->mute != 0;
       sc->sc_vol = ri->volume != 0;
       sc->sc_freq = ri->freq;
       udsbr_setfreq(sc, sc->sc_freq);

       if (sc->sc_mute || sc->sc_vol == 0)
               udsbr_stop(sc);
       else
               udsbr_start(sc);

       return 0;
}

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