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// Copyright 2023 Moritz Plattner (@ebastler), Alex Havermale (@haversnail)
// SPDX-License-Identifier: GPL-2.0-or-later
#include "quantum.h"
#include "transactions.h"
#include <stdio.h>
#include "print.h"
#include "split_util.h"
#include "usbpd.h"
typedef struct _kb_state_t {
usbpd_allowance_t allowance;
} kb_state_t;
kb_state_t kb_state;
const char* usbpd_str(usbpd_allowance_t allowance) {
switch (allowance) {
case USBPD_500MA:
return "500mA";
case USBPD_1500MA:
return "1500mA";
case USBPD_3000MA:
return "3000mA";
default:
dprintf("Encountered unknown allowance enum value: %d\n", allowance);
return "UNKNOWN";
}
}
void kb_state_slave_handler(uint8_t m2s_size, const void* m2s_buffer, uint8_t s2m_size, void* s2m_buffer) {
if (m2s_size == sizeof(kb_state_t)) {
memcpy(&kb_state, m2s_buffer, sizeof(kb_state_t));
} else {
dprintf("Unexpected response in slave handler\n"); // TODO: add split debug logging
}
}
void keyboard_pre_init_kb(void) {
// Disable the PD peripheral in pre-init because its pins are being used in the matrix:
PWR->CR3 |= PWR_CR3_UCPD_DBDIS;
// Call the corresponding _user() function (see https://docs.qmk.fm/#/custom_quantum_functions)
keyboard_pre_init_user();
}
void keyboard_post_init_kb(void) {
// Register keyboard state transaction:
transaction_register_rpc(RPC_ID_KB_STATE, kb_state_slave_handler);
// Set default state values:
kb_state.allowance = USBPD_500MA;
// If the keyboard is master,
if (is_keyboard_master()) {
// Turn on power to the split half and to underglow LEDs:
gpio_set_pin_output(PSW_PIN);
gpio_write_pin_high(PSW_PIN);
// Enable inputs used for current negotiation:
gpio_set_pin_input_high(USBPD_1_PIN);
gpio_set_pin_input_high(USBPD_2_PIN);
// Not needed in this mode (always high-Z with pull-up on PCB if port controller is sink)
gpio_set_pin_input_high(ID_PIN);
} else {
// Prepare output to enable power for USB output after negotiation:
gpio_set_pin_output(PSW_PIN);
// Switch the USB MUXes between hub and ports:
gpio_set_pin_output(USBSW_PIN);
gpio_write_pin_high(USBSW_PIN);
// Enable outputs used for current negotiation and default to 500mA:
gpio_set_pin_output(USBPD_1_PIN);
gpio_write_pin_high(USBPD_1_PIN);
gpio_set_pin_output(USBPD_2_PIN);
gpio_write_pin_high(USBPD_2_PIN);
// Use ID pin to check if client is detected (if low: USB source port powered):
gpio_set_pin_input_high(ID_PIN);
// Indicate that the hub is either self-powered or bus-powered based on whether the bus-power mode flag is enabled
// (configurable for users who would rather always have their device connect, regardless of whether they meet the specs):
gpio_set_pin_output(BUS_B_PIN);
if (DISABLE_BUS_POWER_MODE == TRUE) {
gpio_write_pin_high(BUS_B_PIN);
} else {
gpio_write_pin_low(BUS_B_PIN);
}
}
// Call the corresponding _user() function (see https://docs.qmk.fm/#/custom_quantum_functions)
keyboard_post_init_user();
}
void housekeeping_task_kb(void) {
// Update any shared kb state to send to slave:
static uint32_t last_usbpd_allowance_check_time = 0;
if (timer_elapsed32(last_usbpd_allowance_check_time) > USBPD_ALLOWANCE_CHECK_INTERVAL) {
// On master side: check USBPD_1_PIN and USBPD_2_PIN to determine current negotiated with host
// (Can't use the usbpd_get_allowance() function, as this uses this uses the native CC PD interface
// of the G series MCU, while we're using dedicated port controllers instead):
if (is_keyboard_master()) {
usbpd_allowance_t allowance;
if (gpio_read_pin(USBPD_1_PIN)) {
allowance = USBPD_500MA;
} else if (gpio_read_pin(USBPD_2_PIN)) {
allowance = USBPD_1500MA;
} else {
allowance = USBPD_3000MA;
}
if (kb_state.allowance != allowance) {
printf("Host negotiated current: %s -> %s\n", usbpd_str(kb_state.allowance), usbpd_str(allowance));
kb_state.allowance = allowance;
}
} else {
// On peripheral side - If ID_PIN is low: USB client negotiated 5V successfully -> enable power routing
// Check if PSW_PIN is not already high to avoid wasting time
if (!gpio_read_pin(ID_PIN) && !gpio_read_pin(PSW_PIN)) {
gpio_write_pin_high(PSW_PIN);
dprintf("USB downstream device connected\n"); // TODO: add split debug logging
} else if (gpio_read_pin(ID_PIN) && gpio_read_pin(PSW_PIN)) {
gpio_write_pin_low(PSW_PIN);
dprintf("USB downstream device disconnected\n"); // TODO: add split debug logging
}
};
last_usbpd_allowance_check_time = timer_read32();
};
// Sync state from master to slave:
if (is_keyboard_master() && is_transport_connected()) {
bool needs_sync = false;
static uint32_t last_kb_state_sync_time;
static kb_state_t last_kb_state;
// Check if the state values are different:
if (memcmp(&kb_state, &last_kb_state, sizeof(kb_state_t))) {
needs_sync = true;
memcpy(&last_kb_state, &kb_state, sizeof(kb_state_t));
}
// Sync state every so often regardless:
if (timer_elapsed32(last_kb_state_sync_time) > KB_STATE_SYNC_INTERVAL) {
needs_sync = true;
}
if (needs_sync) {
bool did_sync = transaction_rpc_send(RPC_ID_KB_STATE, sizeof(kb_state_t), &kb_state);
if (did_sync) {
dprintf("Synced to slave\n");
last_kb_state_sync_time = timer_read32();
} else {
dprintf("Failed to sync state\n");
}
}
}
// Update the USBPD output pins on slave half whenever allowance has changed:
if (!is_keyboard_master()) {
static usbpd_allowance_t last_allowance;
if (last_allowance != kb_state.allowance) {
last_allowance = kb_state.allowance;
printf("Setting USB-PD output to %s (%s-powered)\n", usbpd_str(kb_state.allowance), kb_state.allowance == USBPD_500MA ? "bus" : "self"); // TODO: add split debug logging
switch (kb_state.allowance) {
default:
case USBPD_500MA:
// Set USBPD output to 500 mA:
gpio_write_pin_high(USBPD_1_PIN);
gpio_write_pin_high(USBPD_2_PIN);
if (DISABLE_BUS_POWER_MODE == TRUE) {
// Indicate hub is self-powered and devices can try to connect or fast charge:
gpio_write_pin_high(BUS_B_PIN);
} else {
// Indicate hub is bus-powered and devices should not try to connect or fast charge:
gpio_write_pin_low(BUS_B_PIN);
}
break;
case USBPD_1500MA:
// Set USBPD output to 500 mA:
gpio_write_pin_high(USBPD_1_PIN);
gpio_write_pin_high(USBPD_2_PIN);
// Indicate hub is self-powered and devices can try to connect or fast charge:
gpio_write_pin_high(BUS_B_PIN);
break;
case USBPD_3000MA:
// Set USBPD output to 1500 mA:
gpio_write_pin_low(USBPD_1_PIN);
gpio_write_pin_high(USBPD_2_PIN);
// Indicate hub is self-powered and devices can try to connect or fast charge:
gpio_write_pin_high(BUS_B_PIN);
break;
}
}
}
}
#ifdef RGB_MATRIX_ENABLE
bool rgb_matrix_indicators_kb(void) {
if (!rgb_matrix_indicators_user()) {
return false;
}
if (host_keyboard_led_state().caps_lock) {
rgb_matrix_set_color(CAPS_LOCK_LED_INDEX, INDICATOR_MAX_BRIGHTNESS, INDICATOR_MAX_BRIGHTNESS, INDICATOR_MAX_BRIGHTNESS);
} else {
rgb_matrix_set_color(CAPS_LOCK_LED_INDEX, 0, 0, 0);
}
return true;
}
#endif
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