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/*
* 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;
};
/* define a HID++ 2.0 feature with given name */
#define HIDPP20_FEATURE(name) \
int name(LHidDevice *hd, Hidpp20Msg *msg, uint8_t fn, uint8_t *params)
static HIDPP20_FEATURE(feat_featureset)
{
const HidppFeature *feat;
switch (fn) {
case 0: /* GetCount */
params[0] = hd->info.features_count;
return 1;
case 1: /* featureID, featureType = GetFeatureId(featureIndex) */
if (params[0] > hd->info.features_count) {
return -HIDPP20_ERR_CODE_OUTOFRANGE;
}
feat = &hd->info.features[params[0]];
params[0] = feat->id >> 8;
params[1] = (uint8_t) feat->id;
params[2] = feat->type;
return 3;
default:
return -HIDPP20_ERR_CODE_INVALID_FUNCTION_ID;
}
}
/* root feature not included! */
static const HidppFeature features_m525[] = {
{ 0x0001, 0, feat_featureset },
};
void hidpp20_init_features(LHidDevice *hd) {
switch (hd->info.wireless_pid) {
case 0x4013:
hd->info.features = features_m525;
hd->info.features_count = ARRAY_SIZE(features_m525);
break;
}
}
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;
}
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