/*
 * Logitech Unifying receiver emulation (HID++ 2.0 features).
 *
 * Copyright (c) 2014 Peter Wu <peter@lekensteyn.nl>
 *
 * 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 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 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 NONINFRINGEMENT. IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS 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.
 */
#include "hw/hw.h"
#include "ui/console.h"
#include "hw/usb.h"
#include "dump.h"
#include "hw/input/hid.h"
#include "hw/usb/hid-logitech-dj.h"

/* hd - subject device; msg - input/output msg; fn - Function ID; params -
 * function parameters (in/out).
 * If the return value is negative, an error report must be returned. If 0, then
 * no output report must be generated. Higher values signify the number of
 * parameters that must not be cleared when outputting a response */
typedef int (*hidpp_feature_cb_t)(LHidDevice *hd, Hidpp20Msg *msg,
                                  uint8_t fn, uint8_t *params);
struct HidppFeature {
    uint16_t id;
#define HIDPP20_FEAT_TYPE_OBSOLETE  (1 << 7)
#define HIDPP20_FEAT_TYPE_HIDDEN    (1 << 6)
#define HIDPP20_FEAT_TYPE_INTERNAL  (1 << 5)
    uint8_t type;
    hidpp_feature_cb_t callback;
};

void hidpp20_init_features(LHidDevice *hd) {
    switch (hd->info.wireless_pid) {
    }
}

int hidpp20_feature_call(LHidDevice *hd, Hidpp20Msg *func)
{
    uint8_t fn = func->func >> 4;
    const HidppFeature *feat;
    int r;

    if (func->feat_index > hd->info.features_count) {
        return -HIDPP20_ERR_CODE_INVALID_FEATURE_INDEX;
    }

    assert(hd->info.features != NULL);

    feat = &hd->info.features[func->feat_index - 1];
    r = feat->callback(hd, func, fn, func->params);
    if (r > 0) {
        // r are the parameters that must be kept, the others are cleared.
        assert(r <= sizeof(func->params));
        memset(func->params + r, 0, sizeof(func->params) - r);
    }

    return r;
}