/* $XFree86$ */
/*
 * Copyright 2002-2003 Red Hat Inc., Durham, North Carolina.
 *
 * All Rights Reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining
 * a copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation on the rights to use, copy, modify, merge,
 * publish, distribute, sublicense, and/or sell copies of the Software,
 * and to permit persons to whom the Software is furnished to do so,
 * subject to the following conditions:
 *
 * The above copyright notice and this permission notice (including the
 * next paragraph) shall be included in all copies or substantial
 * portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NON-INFRINGEMENT.  IN NO EVENT SHALL RED HAT AND/OR THEIR SUPPLIERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

/*
 * Authors:
 *   Rickard E. (Rik) Faith <faith@redhat.com>
 *
 */

/** \file
 *
 * Routines that are common between #usb-keyboard.c, #usb-mouse.c, and
 * #usb-other.c */

#ifdef HAVE_DMX_CONFIG_H
#include <dmx-config.h>
#endif

#include "usb-private.h"

#define USB_COMMON_DEBUG 1

/*****************************************************************************/
/* Define some macros to make it easier to move this file to another
 * part of the Xserver tree.  All calls to the dmx* layer are #defined
 * here for the .c file.  The .h file will also have to be edited. */
#include "usb-mouse.h"

#define GETPRIV       myPrivate *priv                                         \
                      = ((DMXLocalInputInfoPtr)(pDev->devicePrivate))->private

#define GETNAME       ((DMXLocalInputInfoPtr)(pDevice->public.devicePrivate)) \
                      ->name

#define LOG0(f)       dmxLog(dmxDebug,f)
#define LOG1(f,a)     dmxLog(dmxDebug,f,a)
#define LOG2(f,a,b)   dmxLog(dmxDebug,f,a,b)
#define LOG3(f,a,b,c) dmxLog(dmxDebug,f,a,b,c)
#define LOG1INPUT(p,f,a)         dmxLogInput(p->dmxInput,f,a)
#define LOG3INPUT(p,f,a,b,c)     dmxLogInput(p->dmxInput,f,a,b,c)
#define LOG5INPUT(p,f,a,b,c,d,e) dmxLogInput(p->dmxInput,f,a,b,c,d,e)
#define FATAL0(f)     dmxLog(dmxFatal,f)
#define FATAL1(f,a)   dmxLog(dmxFatal,f,a)
#define FATAL2(f,a,b) dmxLog(dmxFatal,f,a,b)
#define MOTIONPROC    dmxMotionProcPtr
#define ENQUEUEPROC   dmxEnqueueProcPtr
#define CHECKPROC     dmxCheckSpecialProcPtr
#define BLOCK         DMXBlockType

/* End of interface definitions. */
/*****************************************************************************/


/** Read an event from the \a pDev device.  If the event is a motion
 * event, enqueue it with the \a motion function.  Otherwise, enqueue
 * the event with the \a enqueue function.  The \a block type is passed
 * to the functions so that they may block SIGIO handling as appropriate
 * to the caller of this function.
 *
 * Since USB devices return EV_KEY events for buttons and keys, \a
 * minButton is used to decide if a Button or Key event should be
 * queued.*/
void usbRead(DevicePtr pDev,
             MOTIONPROC motion,
             ENQUEUEPROC enqueue,
             int minButton,
             BLOCK block)
{
    GETPRIV;
    struct input_event raw;
    int                v[DMX_MAX_AXES];
    int                axis;

#define PRESS(b)                                         \
    do {                                                 \
        enqueue(pDev, ButtonPress, 0, 0, NULL, block);   \
    } while (0)

#define RELEASE(b)                                       \
    do {                                                 \
        enqueue(pDev, ButtonRelease, 0, 0, NULL, block); \
    } while (0)

    while (read(priv->fd, &raw, sizeof(raw)) > 0) {
#if USB_COMMON_DEBUG > 1
        LOG3("USB: type = %d, code = 0x%02x, value = %d\n",
             raw.type, raw.code, raw.value);
#endif
        switch (raw.type) {
        case EV_KEY:
                                /* raw.value = 1 for first, 2 for repeat */
            if (raw.code > minButton) {
                if (raw.value) PRESS((raw.code & 0x0f) + 1);
                else           RELEASE((raw.code & 0x0f) + 1);
            } else {
                enqueue(pDev, raw.value ? KeyPress : KeyRelease,
                        0, 0, NULL, block);
            }
            break;
        case EV_REL:
            switch (raw.code) {
            case REL_X:
                v[0] = -raw.value;
                v[1] = 0;
                motion(pDev, v, 0, 2, DMX_RELATIVE, block);
                break;
            case REL_Y:
                v[0] = 0;
                v[1] = -raw.value;
                motion(pDev, v, 0, 2, DMX_RELATIVE, block);
                break;
            case REL_WHEEL:
                if ((int)raw.value > 0) {
                    PRESS(4);
                    RELEASE(4);
                } else if ((int)raw.value < 0) {
                    PRESS(5);
                    RELEASE(5);
                }
                break;
            default:
                memset(v, 0, sizeof(v));
                axis = priv->relmap[raw.code];
                v[axis] = raw.value;
                motion(pDev, v, axis, 1, DMX_RELATIVE, block);
            }
            break;
        case EV_ABS:
            memset(v, 0, sizeof(v));
            axis = priv->absmap[raw.code];
            v[axis] = raw.value;
            motion(pDev, v, axis, 1, DMX_ABSOLUTE, block);
            break;
        }
    }
}

#define test_bit(bit)  (priv->mask[(bit)/8] & (1 << ((bit)%8)))
#define test_bits(bit) (bits[(bit)/8] & (1 << ((bit)%8)))

static void usbPrint(myPrivate *priv,
                     const char *filename, const char *devname, int fd)
{
    int           j, k;
    DeviceIntPtr  pDevice = priv->pDevice;
    unsigned char bits[KEY_MAX/8 + 1]; /* RATS: Use ok assuming that
                                        * KEY_MAX is greater than
                                        * REL_MAX, ABS_MAX, SND_MAX, and
                                        * LED_MAX. */

    LOG3INPUT(priv, "%s (%s) using %s\n", pDevice->name, GETNAME, filename);
    LOG1INPUT(priv, "    %s\n", devname);
    for (j = 0; j < EV_MAX; j++) {
        if (test_bit(j)) {
            const char *type  = "unknown";
            char       extra[256]; /* FIXME: may cause buffer overflow */
            extra[0] = '\0';
            switch(j) {
            case EV_KEY: type = "keys/buttons"; break;
            case EV_REL: type = "relative";
                memset(bits, 0, sizeof(bits));
                ioctl(priv->fd, EVIOCGBIT(EV_REL, sizeof(bits)), bits);
                for (k = 0; k < REL_MAX; k++) {
                    if (test_bits(k)) switch (k) {
                    case REL_X:      strcat(extra, " X");      break;
                    case REL_Y:      strcat(extra, " Y");      break;
                    case REL_Z:      strcat(extra, " Z");      break;
                    case REL_HWHEEL: strcat(extra, " HWheel"); break;
                    case REL_DIAL:   strcat(extra, " Dial");   break;
                    case REL_WHEEL:  strcat(extra, " Wheel");  break;
                    case REL_MISC:   strcat(extra, " Misc");   break;
                    }
                }
                break;
            case EV_ABS: type = "absolute";
                memset(bits, 0, sizeof(bits));
                ioctl(priv->fd, EVIOCGBIT(EV_ABS, sizeof(bits)), bits);
                for (k = 0; k < ABS_MAX; k++) {
                    if (test_bits(k)) switch (k) {
                    case ABS_X:        strcat(extra," X");       break;
                    case ABS_Y:        strcat(extra," Y");       break;
                    case ABS_Z:        strcat(extra," Z");       break;
                    case ABS_RX:       strcat(extra," RX");      break;
                    case ABS_RY:       strcat(extra," RY");      break;
                    case ABS_RZ:       strcat(extra," RZ");      break;
                    case ABS_THROTTLE: strcat(extra," Throttle");break;
                    case ABS_RUDDER:   strcat(extra," Rudder");  break;
                    case ABS_WHEEL:    strcat(extra," Wheel");   break;
                    case ABS_GAS:      strcat(extra," Gas");     break;
                    case ABS_BRAKE:    strcat(extra," Break");   break;
                    case ABS_HAT0X:    strcat(extra," Hat0X");   break;
                    case ABS_HAT0Y:    strcat(extra," Hat0Y");   break;
                    case ABS_HAT1X:    strcat(extra," Hat1X");   break;
                    case ABS_HAT1Y:    strcat(extra," Hat1Y");   break;
                    case ABS_HAT2X:    strcat(extra," Hat2X");   break;
                    case ABS_HAT2Y:    strcat(extra," Hat2Y");   break;
                    case ABS_HAT3X:    strcat(extra," Hat3X");   break;
                    case ABS_HAT3Y:    strcat(extra," Hat3Y");   break;
                    case ABS_PRESSURE: strcat(extra," Pressure");break;
                    case ABS_DISTANCE: strcat(extra," Distance");break;
                    case ABS_TILT_X:   strcat(extra," TiltX");   break;
                    case ABS_TILT_Y:   strcat(extra," TiltY");   break;
                    case ABS_MISC:     strcat(extra," Misc");    break;
                    }
                }
                break;
            case EV_MSC: type = "reserved";     break;
            case EV_LED: type = "leds";
                memset(bits, 0, sizeof(bits));
                ioctl(priv->fd, EVIOCGBIT(EV_LED, sizeof(bits)), bits);
                for (k = 0; k < LED_MAX; k++) {
                    if (test_bits(k)) switch (k) {
                    case LED_NUML:    strcat(extra," NumLock");  break;
                    case LED_CAPSL:   strcat(extra," CapsLock"); break;
                    case LED_SCROLLL: strcat(extra," ScrlLock"); break;
                    case LED_COMPOSE: strcat(extra," Compose");  break;
                    case LED_KANA:    strcat(extra," Kana");     break;
                    case LED_SLEEP:   strcat(extra," Sleep");    break;
                    case LED_SUSPEND: strcat(extra," Suspend");  break;
                    case LED_MUTE:    strcat(extra," Mute");     break;
                    case LED_MISC:    strcat(extra," Misc");     break;
                    }
                }
                break;
            case EV_SND: type = "sound";
                memset(bits, 0, sizeof(bits));
                ioctl(priv->fd, EVIOCGBIT(EV_SND, sizeof(bits)), bits);
                for (k = 0; k < SND_MAX; k++) {
                    if (test_bits(k)) switch (k) {
                    case SND_CLICK:   strcat(extra," Click");    break;
                    case SND_BELL:    strcat(extra," Bell");     break;
                    }
                }
                break;
            case EV_REP: type = "repeat";       break;
            case EV_FF:  type = "feedback";     break;
            }
            LOG5INPUT(priv, "    Feature 0x%02x = %s%s%s%s\n", j, type,
                      extra[0] ? " [" : "",
                      extra[0] ? extra+1 : "",
                      extra[0] ? "]" : "");
        }
    }
}

/** Initialized \a pDev as a \a usbMouse, \a usbKeyboard, or \a usbOther
device. */ 
void usbInit(DevicePtr pDev, usbType type)
{
    GETPRIV;
    char          name[64];            /* RATS: Only used in XmuSnprintf */
    int           i, j, k;
    char          buf[256] = { 0, };   /* RATS: Use ok */
    int           version;
    unsigned char bits[KEY_MAX/8 + 1]; /* RATS: Use ok assuming that
                                        * KEY_MAX is greater than
                                        * REL_MAX, ABS_MAX, SND_MAX, and
                                        * LED_MAX. */

    if (priv->fd >=0) return;

    for (i = 0; i < 32; i++) {
        XmuSnprintf(name, sizeof(name), "/dev/input/event%d", i);
        if ((priv->fd = open(name, O_RDWR | O_NONBLOCK, 0)) >= 0) {
            ioctl(priv->fd, EVIOCGVERSION, &version);
            ioctl(priv->fd, EVIOCGNAME(sizeof(buf)), buf);
            memset(priv->mask, 0, sizeof(priv->mask));
            ioctl(priv->fd, EVIOCGBIT(0, sizeof(priv->mask)), priv->mask);

            for (j = 0; j < EV_MAX; j++) {
                if (test_bit(j)) {
                    switch(j) {
                    case EV_REL:
                        memset(bits, 0, sizeof(bits));
                        ioctl(priv->fd, EVIOCGBIT(EV_REL, sizeof(bits)), bits);
                        for (k = 0; k < REL_MAX; k++) {
                            if (test_bits(k)) {
                                if (k == REL_X)      priv->relmap[k] = 0;
                                else if (k == REL_Y) priv->relmap[k] = 1;
                                else priv->relmap[k] = 2 + priv->numAbs;
                                ++priv->numRel;
                            }
                        }
                        break;
                    case EV_ABS:
                        memset(bits, 0, sizeof(bits));
                        ioctl(priv->fd, EVIOCGBIT(EV_ABS, sizeof(bits)), bits);
                        for (k = 0; k < ABS_MAX; k++) {
                            if (test_bits(k)) {
                                priv->absmap[k] = priv->numAbs;
                                ++priv->numAbs;
                            }
                        }
                        break;
                    case EV_LED:
                        memset(bits, 0, sizeof(bits));
                        ioctl(priv->fd, EVIOCGBIT(EV_LED, sizeof(bits)), bits);
                        for (k = 0; k < LED_MAX; k++) {
                            if (test_bits(k)) ++priv->numLeds;
                        }
                        break;
                    }
                }
            }
            switch (type) {
            case usbMouse:
                if (test_bit(EV_REL) && test_bit(EV_KEY))
                    goto found;
                break;
            case usbKeyboard:
                if (test_bit(EV_KEY) && test_bit(EV_LED) && !test_bit(EV_ABS))
                    goto found;
                break;
            case usbOther:
                if (!(test_bit(EV_REL) && test_bit(EV_KEY))
                    && !(test_bit(EV_KEY) && test_bit(EV_LED)
                         && !test_bit(EV_ABS)))
                    goto found;
                break;
            }
            close(priv->fd);
            priv->fd = -1;
        }
    }
    if (priv->fd < 0)
        FATAL1("usbInit: Cannot open /dev/input/event* port (%s)\n"
               "         If you have not done so, you may need to:\n"
               "           rmmod mousedev; rmmod keybdev\n"
               "           modprobe evdev\n",
               strerror(errno));
  found:
    usbPrint(priv, name, buf, priv->fd);
}

/** Turn \a pDev off (i.e., stop taking input from \a pDev). */
void usbOff(DevicePtr pDev)
{
    GETPRIV;

    if (priv->fd >= 0) close(priv->fd);
    priv->fd = -1;
}

/** Create a private structure for use within this file. */
pointer usbCreatePrivate(DeviceIntPtr pDevice)
{
    myPrivate *priv = xalloc(sizeof(*priv));
    memset(priv, 0, sizeof(*priv));
    priv->fd        = -1;
    priv->pDevice   = pDevice;
    return priv;
}

/** Destroy a private structure. */
void usbDestroyPrivate(pointer priv)
{
    if (priv) xfree(priv);
}
