/*	$NetBSD: uark.c,v 1.18 2021/08/07 16:19:17 thorpej Exp $	*/
/*	$OpenBSD: uark.c,v 1.13 2009/10/13 19:33:17 pirofti Exp $	*/

/*
 * Copyright (c) 2006 Jonathan Gray <jsg@openbsd.org>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: uark.c,v 1.18 2021/08/07 16:19:17 thorpej Exp $");

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

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

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

#include <dev/usb/ucomvar.h>

#ifdef UARK_DEBUG
#define DPRINTFN(n, x)  do { if (uarkdebug > (n)) printf x; } while (0)
int	uarkebug = 0;
#else
#define DPRINTFN(n, x)
#endif
#define DPRINTF(x) DPRINTFN(0, x)

#define UARKBUFSZ		256
#define UARK_CONFIG_NO	0
#define UARK_IFACE_NO		0

#define UARK_SET_DATA_BITS(x)	(x - 5)

#define UARK_PARITY_NONE	0x00
#define UARK_PARITY_ODD		0x08
#define UARK_PARITY_EVEN	0x18

#define UARK_STOP_BITS_1	0x00
#define UARK_STOP_BITS_2	0x04

#define UARK_BAUD_REF		3000000

#define UARK_WRITE		0x40
#define UARK_READ		0xc0

#define UARK_REQUEST		0xfe

struct uark_softc {
	device_t		sc_dev;
	struct usbd_device *	sc_udev;
	struct usbd_interface *	sc_iface;
	device_t		sc_subdev;

	u_char			sc_msr;
	u_char			sc_lsr;

	bool			sc_dying;
};

static void	uark_get_status(void *, int portno, u_char *lsr, u_char *msr);
static void	uark_set(void *, int, int, int);
static int	uark_param(void *, int, struct termios *);
static int	uark_open(void *, int);
static void	uark_break(void *, int, int);
static int	uark_cmd(struct uark_softc *, uint16_t, uint16_t);

static const struct ucom_methods uark_methods = {
	.ucom_get_status = uark_get_status,
	.ucom_set = uark_set,
	.ucom_param = uark_param,
	.ucom_open = uark_open,
};

static const struct usb_devno uark_devs[] = {
	{ USB_VENDOR_ARKMICROCHIPS, USB_PRODUCT_ARKMICROCHIPS_USBSERIAL },
};

static int	uark_match(device_t, cfdata_t, void *);
static void	uark_attach(device_t, device_t, void *);
static int	uark_detach(device_t, int);

CFATTACH_DECL_NEW(uark, sizeof(struct uark_softc), uark_match, uark_attach,
    uark_detach, NULL);

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

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

static void
uark_attach(device_t parent, device_t self, void *aux)
{
	struct uark_softc *sc = device_private(self);
	struct usb_attach_arg *uaa = aux;
	struct usbd_device *dev = uaa->uaa_device;
	char *devinfop;
	struct ucom_attach_args ucaa;
	usb_interface_descriptor_t *id;
	usb_endpoint_descriptor_t *ed;
	usbd_status error;
	int i;

	memset(&ucaa, 0, sizeof(ucaa));
	sc->sc_dev = self;

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

	sc->sc_udev = dev;
	sc->sc_dying = false;

	if (usbd_set_config_index(sc->sc_udev, UARK_CONFIG_NO, 1) != 0) {
		aprint_error_dev(self, "could not set configuration no\n");
		sc->sc_dying = true;
		return;
	}

	/* get the first interface handle */
	error = usbd_device2interface_handle(sc->sc_udev, UARK_IFACE_NO,
	    &sc->sc_iface);
	if (error != 0) {
		aprint_error_dev(self, "could not get interface handle\n");
		sc->sc_dying = true;
		return;
	}

	id = usbd_get_interface_descriptor(sc->sc_iface);

	ucaa.ucaa_bulkin = ucaa.ucaa_bulkout = -1;
	for (i = 0; i < id->bNumEndpoints; i++) {
		ed = usbd_interface2endpoint_descriptor(sc->sc_iface, i);
		if (ed == NULL) {
			aprint_error_dev(self,
			    "no endpoint descriptor found for %d\n", i);
			sc->sc_dying = true;
			return;
		}

		if (UE_GET_DIR(ed->bEndpointAddress) == UE_DIR_IN &&
		    UE_GET_XFERTYPE(ed->bmAttributes) == UE_BULK)
			ucaa.ucaa_bulkin = ed->bEndpointAddress;
		else if (UE_GET_DIR(ed->bEndpointAddress) == UE_DIR_OUT &&
		    UE_GET_XFERTYPE(ed->bmAttributes) == UE_BULK)
			ucaa.ucaa_bulkout = ed->bEndpointAddress;
	}

	if (ucaa.ucaa_bulkin == -1 || ucaa.ucaa_bulkout == -1) {
		aprint_error_dev(self, "missing endpoint\n");
		sc->sc_dying = true;
		return;
	}

	ucaa.ucaa_ibufsize = UARKBUFSZ;
	ucaa.ucaa_obufsize = UARKBUFSZ;
	ucaa.ucaa_ibufsizepad = UARKBUFSZ;
	ucaa.ucaa_opkthdrlen = 0;
	ucaa.ucaa_device = sc->sc_udev;
	ucaa.ucaa_iface = sc->sc_iface;
	ucaa.ucaa_methods = &uark_methods;
	ucaa.ucaa_arg = sc;
	ucaa.ucaa_info = NULL;

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

	sc->sc_subdev = config_found(self, &ucaa, ucomprint,
	    CFARGS(.submatch = ucomsubmatch));

	return;
}

static int
uark_detach(device_t self, int flags)
{
	struct uark_softc *sc = device_private(self);
	int rv = 0;

	sc->sc_dying = true;

	if (sc->sc_subdev != NULL) {
		rv = config_detach(sc->sc_subdev, flags);
		sc->sc_subdev = NULL;
	}

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

	return rv;
}

static void
uark_set(void *vsc, int portno, int reg, int onoff)
{
	struct uark_softc *sc = vsc;

	if (sc->sc_dying)
		return;

	switch (reg) {
	case UCOM_SET_BREAK:
		uark_break(sc, portno, onoff);
		return;
	case UCOM_SET_DTR:
	case UCOM_SET_RTS:
	default:
		return;
	}
}

static int
uark_param(void *vsc, int portno, struct termios *t)
{
	struct uark_softc *sc = (struct uark_softc *)vsc;
	int data;

	if (sc->sc_dying)
		return EIO;

	switch (t->c_ospeed) {
	case 300:
	case 600:
	case 1200:
	case 1800:
	case 2400:
	case 4800:
	case 9600:
	case 19200:
	case 38400:
	case 57600:
	case 115200:
		uark_cmd(sc, 3, 0x83);
		uark_cmd(sc, 0, (UARK_BAUD_REF / t->c_ospeed) & 0xFF);
		uark_cmd(sc, 1, (UARK_BAUD_REF / t->c_ospeed) >> 8);
		uark_cmd(sc, 3, 0x03);
		break;
	default:
		return EINVAL;
	}

	if (ISSET(t->c_cflag, CSTOPB))
		data = UARK_STOP_BITS_2;
	else
		data = UARK_STOP_BITS_1;

	if (ISSET(t->c_cflag, PARENB)) {
		if (ISSET(t->c_cflag, PARODD))
			data |= UARK_PARITY_ODD;
		else
			data |= UARK_PARITY_EVEN;
	} else
		data |= UARK_PARITY_NONE;

	switch (ISSET(t->c_cflag, CSIZE)) {
	case CS5:
		data |= UARK_SET_DATA_BITS(5);
		break;
	case CS6:
		data |= UARK_SET_DATA_BITS(6);
		break;
	case CS7:
		data |= UARK_SET_DATA_BITS(7);
		break;
	case CS8:
		data |= UARK_SET_DATA_BITS(8);
		break;
	}

	uark_cmd(sc, 3, 0x00);
	uark_cmd(sc, 3, data);

#if 0
	/* XXX flow control */
	if (ISSET(t->c_cflag, CRTSCTS)) {
		/*  rts/cts flow ctl */
	} else if (ISSET(t->c_iflag, IXON|IXOFF)) {
		/*  xon/xoff flow ctl */
	} else {
		/* disable flow ctl */
	}
#endif

	return 0;
}

static int
uark_open(void *arg, int portno)
{
	struct uark_softc *sc = arg;

	if (sc->sc_dying)
		return EIO;

	return 0;
}

static void
uark_get_status(void *vsc, int portno, u_char *lsr, u_char *msr)
{
	struct uark_softc *sc = vsc;

	if (sc->sc_dying)
		return;

	*msr = sc->sc_msr;
	*lsr = sc->sc_lsr;
}

static void
uark_break(void *vsc, int portno, int onoff)
{
#if 0
	struct uark_softc *sc = vsc;

	if (sc->sc_dying)
		return;

#ifdef UARK_DEBUG
	aprint_normal_dev(sc->sc_dev, "break %s!\n", onoff ? "on" : "off");
#endif

	if (onoff)
		/* break on */
		uark_cmd(sc, 4, 0x01);
	else
		uark_cmd(sc, 4, 0x00);
#endif
}

static int
uark_cmd(struct uark_softc *sc, uint16_t index, uint16_t value)
{
	usb_device_request_t req;
	usbd_status err;

	req.bmRequestType = UARK_WRITE;
	req.bRequest = UARK_REQUEST;
	USETW(req.wValue, value);
	USETW(req.wIndex, index);
	USETW(req.wLength, 0);
	err = usbd_do_request(sc->sc_udev, &req, NULL);

	if (err)
		return EIO;

	return 0;
}