220 lines
7.5 KiB
C
220 lines
7.5 KiB
C
/* Copyright 2022 Ruslan Sayfutdinov (@KapJI)
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "os_detection.h"
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#include <string.h>
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#include "timer.h"
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#ifdef OS_DETECTION_KEYBOARD_RESET
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# include "quantum.h"
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#endif
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#ifdef OS_DETECTION_DEBUG_ENABLE
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# include "eeconfig.h"
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# include "eeprom.h"
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# include "print.h"
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# define STORED_USB_SETUPS 50
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# define EEPROM_USER_OFFSET (uint8_t*)EECONFIG_SIZE
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static uint16_t usb_setups[STORED_USB_SETUPS];
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#endif
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#ifndef OS_DETECTION_DEBOUNCE
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# define OS_DETECTION_DEBOUNCE 250
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#endif
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// 2s should always be more than enough (otherwise, you may have other issues)
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#if OS_DETECTION_DEBOUNCE > 2000
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# undef OS_DETECTION_DEBOUNCE
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# define OS_DETECTION_DEBOUNCE 2000
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#endif
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struct setups_data_t {
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uint8_t count;
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uint8_t cnt_02;
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uint8_t cnt_04;
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uint8_t cnt_ff;
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uint16_t last_wlength;
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};
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struct setups_data_t setups_data = {
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.count = 0,
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.cnt_02 = 0,
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.cnt_04 = 0,
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.cnt_ff = 0,
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};
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static volatile os_variant_t detected_os = OS_UNSURE;
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static volatile os_variant_t reported_os = OS_UNSURE;
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// we need to be able to report OS_UNSURE if that is the stable result of the guesses
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static volatile bool first_report = true;
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// to react on USB state changes
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static volatile struct usb_device_state current_usb_device_state = {.configure_state = USB_DEVICE_STATE_NO_INIT};
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static volatile struct usb_device_state maxprev_usb_device_state = {.configure_state = USB_DEVICE_STATE_NO_INIT};
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// the OS detection might be unstable for a while, "debounce" it
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static volatile bool debouncing = false;
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static volatile fast_timer_t last_time = 0;
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bool process_detected_host_os_modules(os_variant_t os);
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void os_detection_task(void) {
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#ifdef OS_DETECTION_KEYBOARD_RESET
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// resetting the keyboard on the USB device state change callback results in instability, so delegate that to this task
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// only take action if it's been stable at least once, to avoid issues with some KVMs
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if (current_usb_device_state.configure_state <= USB_DEVICE_STATE_INIT && maxprev_usb_device_state.configure_state >= USB_DEVICE_STATE_CONFIGURED) {
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if (debouncing && timer_elapsed_fast(last_time) >= OS_DETECTION_DEBOUNCE) {
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soft_reset_keyboard();
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}
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return;
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}
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#endif
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#ifdef OS_DETECTION_SINGLE_REPORT
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if (!first_report) {
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return;
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}
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#endif
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if (current_usb_device_state.configure_state == USB_DEVICE_STATE_CONFIGURED) {
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// debouncing goes for both the detected OS as well as the USB state
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if (debouncing && timer_elapsed_fast(last_time) >= OS_DETECTION_DEBOUNCE) {
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debouncing = false;
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last_time = 0;
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if (detected_os != reported_os || first_report) {
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first_report = false;
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reported_os = detected_os;
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process_detected_host_os_modules(detected_os);
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process_detected_host_os_kb(detected_os);
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}
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}
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}
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}
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__attribute__((weak)) bool process_detected_host_os_modules(os_variant_t os) {
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return true;
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}
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__attribute__((weak)) bool process_detected_host_os_kb(os_variant_t detected_os) {
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return process_detected_host_os_user(detected_os);
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}
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__attribute__((weak)) bool process_detected_host_os_user(os_variant_t detected_os) {
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return true;
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}
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// Some collected sequences of wLength can be found in tests.
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void process_wlength(const uint16_t w_length) {
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#ifdef OS_DETECTION_DEBUG_ENABLE
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usb_setups[setups_data.count] = w_length;
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#endif
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setups_data.count++;
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setups_data.last_wlength = w_length;
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if (w_length == 0x2) {
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setups_data.cnt_02++;
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} else if (w_length == 0x4) {
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setups_data.cnt_04++;
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} else if (w_length == 0xFF) {
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setups_data.cnt_ff++;
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}
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// now try to make a guess
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os_variant_t guessed = OS_UNSURE;
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if (setups_data.count >= 3) {
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if (setups_data.cnt_ff >= 2 && setups_data.cnt_04 >= 1) {
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guessed = OS_WINDOWS;
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} else if (setups_data.count == setups_data.cnt_ff) {
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// Linux has 3 packets with 0xFF.
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guessed = OS_LINUX;
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} else if (setups_data.count >= 5 && setups_data.last_wlength == 0xFF && setups_data.cnt_ff >= 1 && setups_data.cnt_02 >= 2) {
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guessed = OS_MACOS;
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} else if (setups_data.count == 4 && setups_data.cnt_ff == 0 && setups_data.cnt_02 == 2) {
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// iOS and iPadOS don't have the last 0xFF packet.
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guessed = OS_IOS;
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} else if (setups_data.cnt_ff == 0 && setups_data.cnt_02 == 3 && setups_data.cnt_04 == 1) {
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// This is actually PS5.
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guessed = OS_LINUX;
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} else if (setups_data.cnt_ff >= 1 && setups_data.cnt_02 == 0 && setups_data.cnt_04 == 0) {
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// This is actually Quest 2 or Nintendo Switch.
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guessed = OS_LINUX;
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}
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}
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// only replace the guessed value if not unsure
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if (guessed != OS_UNSURE) {
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detected_os = guessed;
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}
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// whatever the result, debounce
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last_time = timer_read_fast();
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debouncing = true;
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}
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os_variant_t detected_host_os(void) {
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return detected_os;
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}
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void erase_wlength_data(void) {
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memset(&setups_data, 0, sizeof(setups_data));
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detected_os = OS_UNSURE;
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reported_os = OS_UNSURE;
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current_usb_device_state.configure_state = USB_DEVICE_STATE_NO_INIT;
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maxprev_usb_device_state.configure_state = USB_DEVICE_STATE_NO_INIT;
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debouncing = false;
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last_time = 0;
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first_report = true;
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}
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void os_detection_notify_usb_device_state_change(struct usb_device_state usb_device_state) {
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// treat this like any other source of instability
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if (maxprev_usb_device_state.configure_state < current_usb_device_state.configure_state) {
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maxprev_usb_device_state.configure_state = current_usb_device_state.configure_state;
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}
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current_usb_device_state = usb_device_state;
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last_time = timer_read_fast();
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debouncing = true;
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}
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#if defined(SPLIT_KEYBOARD) && defined(SPLIT_DETECTED_OS_ENABLE)
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void slave_update_detected_host_os(os_variant_t os) {
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detected_os = os;
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last_time = timer_read_fast();
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debouncing = true;
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}
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#endif
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#ifdef OS_DETECTION_DEBUG_ENABLE
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void print_stored_setups(void) {
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# ifdef CONSOLE_ENABLE
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uint8_t cnt = eeprom_read_byte(EEPROM_USER_OFFSET);
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for (uint16_t i = 0; i < cnt; ++i) {
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uint16_t* addr = (uint16_t*)EEPROM_USER_OFFSET + i * sizeof(uint16_t) + sizeof(uint8_t);
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xprintf("i: %d, wLength: 0x%02X\n", i, eeprom_read_word(addr));
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}
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# endif
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}
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void store_setups_in_eeprom(void) {
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eeprom_update_byte(EEPROM_USER_OFFSET, setups_data.count);
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for (uint16_t i = 0; i < setups_data.count; ++i) {
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uint16_t* addr = (uint16_t*)EEPROM_USER_OFFSET + i * sizeof(uint16_t) + sizeof(uint8_t);
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eeprom_update_word(addr, usb_setups[i]);
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}
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}
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#endif // OS_DETECTION_DEBUG_ENABLE
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