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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 "debug.h"
#include "hidpp.h"
#include "hidpp10.h"
#include "hidpp20.h"
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_id = 0x00,
.func = 0x14,
.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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