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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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