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/* Copyright 2022 Ruslan Sayfutdinov (@KapJI)
*
* 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 2 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 "os_detection.h"
#include <string.h>
#ifdef OS_DETECTION_DEBUG_ENABLE
# include "eeconfig.h"
# include "eeprom.h"
# include "print.h"
# define STORED_USB_SETUPS 50
# define EEPROM_USER_OFFSET (uint8_t*)EECONFIG_SIZE
uint16_t usb_setups[STORED_USB_SETUPS];
#endif
#ifdef OS_DETECTION_ENABLE
struct setups_data_t {
uint8_t count;
uint8_t cnt_02;
uint8_t cnt_04;
uint8_t cnt_ff;
uint16_t last_wlength;
os_variant_t detected_os;
};
struct setups_data_t setups_data = {
.count = 0,
.cnt_02 = 0,
.cnt_04 = 0,
.cnt_ff = 0,
.detected_os = OS_UNSURE,
};
// Some collected sequences of wLength can be found in tests.
void make_guess(void) {
if (setups_data.count < 3) {
return;
}
if (setups_data.cnt_ff >= 2 && setups_data.cnt_04 >= 1) {
setups_data.detected_os = OS_WINDOWS;
return;
}
if (setups_data.count == setups_data.cnt_ff) {
// Linux has 3 packets with 0xFF.
setups_data.detected_os = OS_LINUX;
return;
}
if (setups_data.count == 5 && setups_data.last_wlength == 0xFF && setups_data.cnt_ff == 1 && setups_data.cnt_02 == 2) {
setups_data.detected_os = OS_MACOS;
return;
}
if (setups_data.count == 4 && setups_data.cnt_ff == 0 && setups_data.cnt_02 == 2) {
// iOS and iPadOS don't have the last 0xFF packet.
setups_data.detected_os = OS_IOS;
return;
}
if (setups_data.cnt_ff == 0 && setups_data.cnt_02 == 3 && setups_data.cnt_04 == 1) {
// This is actually PS5.
setups_data.detected_os = OS_LINUX;
return;
}
if (setups_data.cnt_ff >= 1 && setups_data.cnt_02 == 0 && setups_data.cnt_04 == 0) {
// This is actually Quest 2 or Nintendo Switch.
setups_data.detected_os = OS_LINUX;
return;
}
}
void process_wlength(const uint16_t w_length) {
# ifdef OS_DETECTION_DEBUG_ENABLE
usb_setups[setups_data.count] = w_length;
# endif
setups_data.count++;
setups_data.last_wlength = w_length;
if (w_length == 0x2) {
setups_data.cnt_02++;
} else if (w_length == 0x4) {
setups_data.cnt_04++;
} else if (w_length == 0xFF) {
setups_data.cnt_ff++;
}
make_guess();
}
os_variant_t detected_host_os(void) {
return setups_data.detected_os;
}
void erase_wlength_data(void) {
memset(&setups_data, 0, sizeof(setups_data));
}
#endif // OS_DETECTION_ENABLE
#ifdef OS_DETECTION_DEBUG_ENABLE
void print_stored_setups(void) {
# ifdef CONSOLE_ENABLE
uint8_t cnt = eeprom_read_byte(EEPROM_USER_OFFSET);
for (uint16_t i = 0; i < cnt; ++i) {
uint16_t* addr = (uint16_t*)EEPROM_USER_OFFSET + i * sizeof(uint16_t) + sizeof(uint8_t);
xprintf("i: %d, wLength: 0x%02X\n", i, eeprom_read_word(addr));
}
# endif
}
void store_setups_in_eeprom(void) {
eeprom_update_byte(EEPROM_USER_OFFSET, setups_data.count);
for (uint16_t i = 0; i < setups_data.count; ++i) {
uint16_t* addr = (uint16_t*)EEPROM_USER_OFFSET + i * sizeof(uint16_t) + sizeof(uint8_t);
eeprom_update_word(addr, usb_setups[i]);
}
}
#endif // OS_DETECTION_DEBUG_ENABLE
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