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/*
* HID++ 2.0 protocol details.
*
* Copyright (C) 2014 Peter Wu <peter@lekensteyn.nl>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <assert.h>
#include <stddef.h>
#include <stdint.h>
#include <stdlib.h>
#include "debug.h"
#include "hidpp.h"
#include "hidpp10.h"
#include "hidpp20.h"
int hidpp20_get_features_count(int fd, uint8_t device_index,
const FeatureInfo *ifeatureset,
uint8_t *count)
{
int r;
HidppMessage req = {
.report_id = HIDPP_SHORT,
.device_index = device_index,
.feature_index = ifeatureset->feature_index,
.func = HIDPP20_FUNC(0),
};
r = hidpp10_request(fd, &req, NULL, NULL);
if (r == 0) {
*count = req.params[0];
} else {
trace_log("[ix=%02x] IFeatureSet.GetCount failed with %#x\n",
device_index, r);
}
return r;
}
int hidpp20_get_feature(int fd, uint8_t device_index,
const FeatureInfo *ifeatureset,
uint8_t feature_index, FeatureInfo *fi)
{
int r;
HidppMessage req = {
.report_id = HIDPP_SHORT,
.device_index = device_index,
.feature_index = ifeatureset->feature_index,
.func = HIDPP20_FUNC(1), /* GetFeatureId */
.params = { feature_index }
};
assert(device_index >= 1 && device_index <= MAX_DEVICES);
r = hidpp10_request(fd, &req, NULL, NULL);
if (r == 0) {
fi->feature_index = feature_index;
fi->feature_id = (req.params[0] << 8) | req.params[1];
fi->feature_type = req.params[2];
} else {
trace_log("[ix=%02x] failed to get feature %i, error=%i\n",
device_index, feature_index, r);
}
return r;
}
int hidpp20_get_feature_by_id(int fd, uint8_t device_index, uint16_t feature_id,
FeatureInfo *fi)
{
int r;
HidppMessage req = {
.report_id = HIDPP_SHORT,
.device_index = device_index,
.feature_index = 0x00, /* IRoot */
.func = HIDPP20_FUNC(0), /* GetFeature */
.params = { feature_id >> 8, (uint8_t) feature_id }
};
assert(device_index >= 1 && device_index <= MAX_DEVICES);
r = hidpp10_request(fd, &req, NULL, NULL);
if (r == 0) {
fi->feature_index = req.params[0];
fi->feature_id = feature_id;
fi->feature_type = req.params[1];
} else {
trace_log("[ix=%02x] failed to get feature id %#06x, error=%i\n",
device_index, feature_id, r);
}
return r;
}
FeatureInfo *hidpp20_get_features(int fd, uint8_t device_index, unsigned *count)
{
int r, i;
FeatureInfo fi;
FeatureInfo *infos;
uint8_t count_nonroot; /* features count not including root feature */
assert(device_index >= 1 && device_index <= MAX_DEVICES);
*count = 0;
r = hidpp20_get_version(fd, device_index);
if (r < 0x0200) {
trace_log("[ix=%02x] HID++ 2.0 required for features, got %#4x\n",
device_index, r);
return NULL;
}
r = hidpp20_get_feature_by_id(fd, device_index, 0x0001, &fi);
if (r) {
trace_log("[ix=%02x] FeatureSet not found, error=%#x\n",
device_index, r);
return NULL;
}
r = hidpp20_get_features_count(fd, device_index, &fi, &count_nonroot);
if (r)
return NULL;
infos = calloc(*count, sizeof(FeatureInfo));
/* infos[0] is the Root feature which has index=0, id=0, type=0 */
for (i = 1; i <= count_nonroot; i++) {
r = hidpp20_get_feature(fd, device_index, &fi, i, &infos[i]);
if (r) {
trace_log("[ix=%02x] feature %i not found, error=%#x\n",
device_index, i, r);
free(infos);
return NULL;
}
}
/* maybe qsort(infos); here? */
*count = count_nonroot + 1;
return infos;
}
uint16_t hidpp20_get_version(int fd, uint8_t device_index)
{
int r;
uint16_t ver = 0;
const uint8_t pingData = 0x14;
HidppMessage req = {
.report_id = HIDPP_SHORT,
.device_index = device_index,
.feature_index = 0x00, /* IRoot */
.func = HIDPP20_FUNC(1),
.params = { 0, 0, pingData }
};
assert(device_index >= 1 && device_index <= MAX_DEVICES);
r = hidpp10_request(fd, &req, NULL, NULL);
if (r == 0 && req.params[2] == pingData) {
ver = (req.params[0] << 8) | req.params[1];
} else if (r == HIDPP_ERR_INVALID_SUBID) {
ver = 0x0100;
} else {
trace_log("[ix=%02x] HID++ version unavailable, error=%i\n",
device_index, r);
}
return ver;
}
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