/*      $NetBSD: if_upl.c,v 1.77 2022/03/03 05:56:28 riastradh Exp $    */

/*
* Copyright (c) 2000 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Lennart Augustsson ([email protected]) at
* Carlstedt Research & Technology.
*
* 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.
*/

/*
* Prolific PL2301/PL2302 driver
*/

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: if_upl.c,v 1.77 2022/03/03 05:56:28 riastradh Exp $");

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

#include <sys/param.h>

#include <dev/usb/usbnet.h>

#include <net/if_types.h>

#ifdef INET
#include <netinet/in.h>
#include <netinet/in_var.h>
#include <netinet/if_inarp.h>
#endif

/*
* 7  6  5  4  3  2  1  0
* tx rx 1  0
* 1110 0000 rxdata
* 1010 0000 idle
* 0010 0000 tx over
* 0110      tx over + rxd
*/

#define UPL_RXDATA              0x40
#define UPL_TXOK                0x80

#define UPL_CONFIG_NO           1
#define UPL_IFACE_IDX           0

/***/

#define UPL_INTR_INTERVAL       20

#define UPL_BUFSZ               1024

#define UPL_RX_LIST_CNT         1
#define UPL_TX_LIST_CNT         1

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

/*
* Various supported device vendors/products.
*/
static const struct usb_devno sc_devs[] = {
       { USB_VENDOR_PROLIFIC, USB_PRODUCT_PROLIFIC_PL2301 },
       { USB_VENDOR_PROLIFIC, USB_PRODUCT_PROLIFIC_PL2302 },
       { USB_VENDOR_PROLIFIC, USB_PRODUCT_PROLIFIC_PL25A1 },
       { USB_VENDOR_BELKIN, USB_PRODUCT_BELKIN_F5U258 },
       { USB_VENDOR_NI, USB_PRODUCT_NI_HTOH_7825 }
};

static int      upl_match(device_t, cfdata_t, void *);
static void     upl_attach(device_t, device_t, void *);

CFATTACH_DECL_NEW(upl, sizeof(struct usbnet), upl_match, upl_attach,
   usbnet_detach, usbnet_activate);

#if 0
static void upl_uno_intr(struct usbnet *, usbd_status);
#endif
static void upl_uno_rx_loop(struct usbnet *, struct usbnet_chain *, uint32_t);
static unsigned upl_uno_tx_prepare(struct usbnet *, struct mbuf *,
                              struct usbnet_chain *);
static int upl_uno_ioctl(struct ifnet *, u_long, void *);

static const struct usbnet_ops upl_ops = {
       .uno_tx_prepare = upl_uno_tx_prepare,
       .uno_rx_loop = upl_uno_rx_loop,
       .uno_ioctl = upl_uno_ioctl,
#if 0
       .uno_intr = upl_uno_intr,
#endif
};

static int upl_output(struct ifnet *, struct mbuf *, const struct sockaddr *,
                     const struct rtentry *);
static void upl_input(struct ifnet *, struct mbuf *);

/*
* Probe for a Prolific chip.
*/
static int
upl_match(device_t parent, cfdata_t match, void *aux)
{
       struct usb_attach_arg *uaa = aux;

       return usb_lookup(sc_devs, uaa->uaa_vendor, uaa->uaa_product) != NULL ?
               UMATCH_VENDOR_PRODUCT : UMATCH_NONE;
}

static void
upl_attach(device_t parent, device_t self, void *aux)
{
       struct usbnet * const   un = device_private(self);
       struct usb_attach_arg   *uaa = aux;
       char                    *devinfop;
       struct usbd_device *    dev = uaa->uaa_device;
       usbd_status             err;
       usb_interface_descriptor_t      *id;
       usb_endpoint_descriptor_t       *ed;
       int                     i;

       DPRINTFN(5,(" : upl_attach: un=%p, dev=%p", un, dev));

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

       un->un_dev = self;
       un->un_udev = dev;
       un->un_sc = un;
       un->un_ops = &upl_ops;
       un->un_rx_xfer_flags = USBD_SHORT_XFER_OK;
       un->un_tx_xfer_flags = USBD_FORCE_SHORT_XFER;
       un->un_rx_list_cnt = UPL_RX_LIST_CNT;
       un->un_tx_list_cnt = UPL_TX_LIST_CNT;
       un->un_rx_bufsz = UPL_BUFSZ;
       un->un_tx_bufsz = UPL_BUFSZ;

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

       err = usbd_device2interface_handle(dev, UPL_IFACE_IDX, &un->un_iface);
       if (err) {
               aprint_error_dev(self, "getting interface handle failed\n");
               return;
       }

       id = usbd_get_interface_descriptor(un->un_iface);

       /* Find endpoints. */
       for (i = 0; i < id->bNumEndpoints; i++) {
               ed = usbd_interface2endpoint_descriptor(un->un_iface, i);
               if (ed == NULL) {
                       aprint_error_dev(self, "couldn't get ep %d\n", i);
                       return;
               }
               if (UE_GET_DIR(ed->bEndpointAddress) == UE_DIR_IN &&
                   UE_GET_XFERTYPE(ed->bmAttributes) == UE_BULK) {
                       un->un_ed[USBNET_ENDPT_RX] = ed->bEndpointAddress;
               } else if (UE_GET_DIR(ed->bEndpointAddress) == UE_DIR_OUT &&
                          UE_GET_XFERTYPE(ed->bmAttributes) == UE_BULK) {
                       un->un_ed[USBNET_ENDPT_TX] = ed->bEndpointAddress;
               }
       }

       if (un->un_ed[USBNET_ENDPT_RX] == 0 || un->un_ed[USBNET_ENDPT_TX] == 0 /*||
           un->un_ed[USBNET_ENDPT_INTR] == 0*/) {
               aprint_error_dev(self, "missing endpoint\n");
               return;
       }

       usbnet_attach(un);

       /* Initialize interface info.*/
       struct ifnet *ifp = usbnet_ifp(un);
       ifp->if_mtu = UPL_BUFSZ;
       ifp->if_type = IFT_OTHER;
       ifp->if_addrlen = 0;
       ifp->if_hdrlen = 0;
       ifp->if_output = upl_output;
       ifp->_if_input = upl_input;
       ifp->if_baudrate = 12000000;
       ifp->if_dlt = DLT_RAW;

       usbnet_attach_ifp(un, IFF_POINTOPOINT | IFF_NOARP | IFF_SIMPLEX,
           0, NULL);
}

static void
upl_uno_rx_loop(struct usbnet * un, struct usbnet_chain *c, uint32_t total_len)
{

       DPRINTFN(9,("%s: %s: enter length=%d\n",
                   device_xname(un->un_dev), __func__, total_len));

       usbnet_input(un, c->unc_buf, total_len);
}

static unsigned
upl_uno_tx_prepare(struct usbnet *un, struct mbuf *m, struct usbnet_chain *c)
{
       int     total_len;

       if ((unsigned)m->m_pkthdr.len > un->un_tx_bufsz)
               return 0;

       m_copydata(m, 0, m->m_pkthdr.len, c->unc_buf);
       total_len = m->m_pkthdr.len;

       DPRINTFN(10,("%s: %s: total_len=%d\n",
                    device_xname(un->un_dev), __func__, total_len));

       return total_len;
}

static int
upl_uno_ioctl(struct ifnet *ifp, u_long cmd, void *data)
{
       if (cmd == SIOCSIFMTU) {
               struct ifreq *ifr = data;

               if (ifr->ifr_mtu > UPL_BUFSZ)
                       return EINVAL;
       }
       return 0;
}

static int
upl_output(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *dst,
   const struct rtentry *rt0)
{
       struct usbnet * const un __unused = ifp->if_softc;

       DPRINTFN(10,("%s: %s: enter\n", device_xname(un->un_dev), __func__));

       /* If the queueing discipline needs packet classification, do it now. */
       IFQ_CLASSIFY(&ifp->if_snd, m, dst->sa_family);

       /*
        * Queue message on interface, and start output if interface
        * not yet active.
        */
       return if_transmit_lock(ifp, m);
}

static void
upl_input(struct ifnet *ifp, struct mbuf *m)
{
#ifdef INET
       size_t pktlen = m->m_len;
       int s;

       s = splnet();
       if (__predict_false(!pktq_enqueue(ip_pktq, m, 0))) {
               if_statinc(ifp, if_iqdrops);
               m_freem(m);
       } else {
               if_statadd2(ifp, if_ipackets, 1, if_ibytes, pktlen);
       }
       splx(s);
#endif
}

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

USBNET_MODULE(upl)

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