boot: Implement DetectBootReason

stratosphere/boot/source/boot_rtc_driver.cpp

@@ -0,0 +1,41 @@
+/*
+ * Copyright (c) 2018-2019 Atmosphère-NX
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope 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 <switch.h>
+#include <stratosphere.hpp>
+#include "boot_functions.hpp"
+#include "boot_rtc_driver.hpp"
+
+Result RtcDriver::ReadRtcRegister(u8 *out, u8 address) {
+    const u8 update_addr = 0x04;
+    const u8 update_val = 0x10;
+    Result rc = Boot::WriteI2cRegister(this->i2c_session, &update_val, sizeof(update_val), &update_addr, sizeof(update_addr));
+    if (R_FAILED(rc)) {
+        return rc;
+    }
+    svcSleepThread(16'000'000ul);
+    return Boot::ReadI2cRegister(this->i2c_session, out, sizeof(*out), &address, sizeof(address));
+}
+
+Result RtcDriver::GetRtcIntr(u8 *out) {
+    const u8 addr = 0x00;
+    return Boot::ReadI2cRegister(this->i2c_session, out, sizeof(*out), &addr, sizeof(addr));
+}
+
+Result RtcDriver::GetRtcIntrM(u8 *out) {
+    const u8 addr = 0x01;
+    return this->ReadRtcRegister(out, addr);
+}