Add mcu::HWC service (#373)

libctru/include/3ds.h

@@ -65,6 +65,7 @@ extern "C" {
 #include <3ds/services/srvpm.h>
 #include <3ds/services/loader.h>
 #include <3ds/services/y2r.h>
+#include <3ds/services/mcuhwc.h>
 #include <3ds/services/hb.h>
 
 #include <3ds/gpu/gx.h>
@@ -77,8 +78,9 @@ extern "C" {
 
 #include <3ds/applets/swkbd.h>
 #include <3ds/applets/error.h>
+
 #include <3ds/applets/miiselector.h>
-  
+
 #include <3ds/sdmc.h>
 #include <3ds/romfs.h>
 #include <3ds/font.h>

libctru/include/3ds/services/mcuhwc.h

@@ -0,0 +1,45 @@
+/**
+ * @file mcuHwc.h
+ * @brief mcuHwc service.
+ */
+#pragma once
+
+/// Initializes mcuHwc.
+Result mcuHwcInit(void);
+
+/// Exits mcuHwc.
+void mcuHwcExit(void);
+
+/**
+ * @brief Reads data from a mcuHwc Register
+ * @param reg Register number. See https://www.3dbrew.org/wiki/I2C_Registers#Device_3 for more info
+ * @param data Pointer to write the data to.
+ * @param size Size of data to be read
+ */
+Result mcuHwcReadRegister(u8 reg, void *data, u32 size);
+
+/**
+ * @brief Writes data to a mcuHwc Register
+ * @param reg Register number. See https://www.3dbrew.org/wiki/I2C_Registers#Device_3 for more info
+ * @param data Pointer to write the data to.
+ * @param size Size of data to be written
+ */
+Result mcuHwcWriteRegister(u8 reg, const void *data, u32 size);
+
+/**
+ * @brief Gets the battery voltage
+ * @param voltage Pointer to write the battery voltage to.
+ */
+Result mcuHwcGetBatteryVoltage(u8 *voltage);
+
+/**
+ * @brief Gets the battery level
+ * @param level Pointer to write the current battery level to.
+ */
+Result mcuHwcGetBatteryLevel(u8 *level);
+
+/**
+ * @brief Gets the sound slider level
+ * @param level Pointer to write the slider level to.
+ */
+Result mcuHwcGetSoundSliderLevel(u8 *level);

libctru/source/services/mcuhwc.c

@@ -0,0 +1,93 @@
+#include <3ds.h>
+#include <3ds/services/mcuhwc.h>
+
+static Handle mcuHwcHandle;
+static int mcuHwcRefCount;
+
+Result mcuHwcInit(void)
+{
+	if (AtomicPostIncrement(&mcuHwcRefCount)) return 0;
+	Result res = srvGetServiceHandle(&mcuHwcHandle, "mcu::HWC");
+	if (R_FAILED(res)) AtomicDecrement(&mcuHwcRefCount);
+	return res;
+}
+
+void mcuHwcExit(void)
+{
+	if (AtomicDecrement(&mcuHwcRefCount)) return;
+	svcCloseHandle(mcuHwcHandle);
+}
+
+Result mcuHwcReadRegister(u8 reg, void* data, u32 size)
+{
+	Result ret = 0;
+	u32 *cmdbuf = getThreadCommandBuffer();
+
+	cmdbuf[0] = IPC_MakeHeader(0x1,2,2); // 0x10082
+	cmdbuf[1] = reg;
+	cmdbuf[2] = size;
+	cmdbuf[3] = IPC_Desc_Buffer (size, IPC_BUFFER_W);
+	cmdbuf[4] = (u32)data;
+
+	if(R_FAILED(ret = svcSendSyncRequest(mcuHwcHandle)))return ret;
+
+	return (Result)cmdbuf[1];
+}
+
+Result mcuHwcWriteRegister(u8 reg, const void *data, u32 size)
+{
+	Result ret = 0;
+	u32 *cmdbuf = getThreadCommandBuffer();
+
+	cmdbuf[0] = IPC_MakeHeader(0x2,2,2); // 0x20082
+	cmdbuf[1] = reg;
+	cmdbuf[2] = size;
+	cmdbuf[3] = IPC_Desc_Buffer (size, IPC_BUFFER_R);
+	cmdbuf[4] = (u32)data;
+
+	if(R_FAILED(ret = svcSendSyncRequest(mcuHwcHandle)))return ret;
+
+	return (Result)cmdbuf[1];
+}
+
+Result mcuHwcGetBatteryVoltage(u8 *voltage)
+{
+	Result ret = 0;
+	u32 *cmdbuf = getThreadCommandBuffer();
+
+	cmdbuf[0] = IPC_MakeHeader(0x4,0,0); // 0x40000
+
+	if(R_FAILED(ret = svcSendSyncRequest(mcuHwcHandle)))return ret;
+
+	*voltage = cmdbuf[2];
+
+	return (Result)cmdbuf[1];
+}
+
+Result mcuHwcGetBatteryLevel(u8 *level)
+{
+	Result ret = 0;
+	u32 *cmdbuf = getThreadCommandBuffer();
+
+	cmdbuf[0] = IPC_MakeHeader(0x5,0,0); // 0x50000
+
+	if(R_FAILED(ret = svcSendSyncRequest(mcuHwcHandle)))return ret;
+
+	*level = cmdbuf[2];
+
+	return (Result)cmdbuf[1];
+}
+
+Result mcuHwcGetSoundSliderLevel(u8 *level)
+{
+	Result ret = 0;
+	u32 *cmdbuf = getThreadCommandBuffer();
+
+	cmdbuf[0] = IPC_MakeHeader(0xB,0,0); // 0xB0000
+
+	if(R_FAILED(ret = svcSendSyncRequest(mcuHwcHandle)))return ret;
+
+	*level = cmdbuf[2];
+
+	return (Result)cmdbuf[1];
+}