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Code Issues Releases Activity

Manage USB transfer session using a background thread.

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This commit is contained in:
Pablo Curiel 2020-05-13 10:09:51 -04:00
parent a3790dd0d6
commit 1ebc106b79
3 changed files with 135 additions and 78 deletions
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15
source/main.c
View file

@ -366,7 +366,7 @@ int main(int argc, char *argv[])
consolePrint("lrOpenLocationResolver succeeded\n");
rc = lrLrResolveProgramPath(&resolver, (u64)0x01007EF00011E000, path); // ACNH 0x01006F8002326000 | Smash 0x01006A800016E000 | Dark Souls 0x01004AB00A260000 | BotW 0x01007EF00011E000
rc = lrLrResolveProgramPath(&resolver, (u64)0x01004AB00A260000, path); // ACNH 0x01006F8002326000 | Smash 0x01006A800016E000 | Dark Souls 0x01004AB00A260000 | BotW 0x01007EF00011E000
if (R_FAILED(rc))
{
consolePrint("lrLrResolveProgramPath failed\n");
@ -423,16 +423,13 @@ int main(int argc, char *argv[])
shared_data.data_written = 0;
romfsGetTotalDataSize(&romfs_ctx, &(shared_data.total_size));
consolePrint("waiting for usb connection... ");
consolePrint("waiting for usb connection...\n");
if (!usbStartSession())
while(appletMainLoop())
{
consolePrint("failed\n");
goto out2;
if (usbIsReady()) break;
}
consolePrint("success\n");
consolePrint("creating threads\n");
thrd_create(&read_thread, read_thread_func, &shared_data);
thrd_create(&write_thread, write_thread_func, &shared_data);
@ -510,10 +507,6 @@ int main(int argc, char *argv[])
goto out2;
}
consolePrint("ending usb session... ");
usbEndSession();
consolePrint("done\n");
consolePrint("process completed in %lu seconds\n", start);

186
source/usb.c
View file

@ -20,6 +20,7 @@
#include <stdlib.h>
#include <malloc.h>
#include <time.h>
#include <threads.h>
#include "usb.h"
#include "utils.h"
@ -28,8 +29,6 @@
#define USB_CMD_HEADER_MAGIC 0x4E584454 /* "NXDT" */
#define USB_SESSION_START_TIMEOUT 10 /* 10 seconds */
#define USB_TRANSFER_ALIGNMENT 0x1000 /* 4 KiB */
#define USB_TRANSFER_TIMEOUT 5 /* 5 seconds */
@ -45,7 +44,7 @@ typedef struct {
typedef enum {
UsbCommandType_StartSession = 0,
UsbCommandType_SendFileProperties = 1,
UsbCommandType_SendNspHeader = 2, /* Needs to be implemented */
UsbCommandType_SendNspHeader = 2, ///< Needs to be implemented.
UsbCommandType_EndSession = 3
} UsbCommandType;
@ -73,15 +72,15 @@ typedef struct {
} UsbCommandSendFileProperties;
typedef enum {
/* Expected response code */
/// Expected response code.
UsbStatusType_Success = 0,
/* Internal usage */
/// Internal usage.
UsbStatusType_InvalidCommandSize = 1,
UsbStatusType_WriteCommandFailed = 2,
UsbStatusType_ReadStatusFailed = 3,
/* These can be returned by the host device */
/// These can be returned by the host device.
UsbStatusType_InvalidMagicWord = 4,
UsbStatusType_UnsupportedCommand = 5,
UsbStatusType_UnsupportedAbiVersion = 6,
@ -97,18 +96,26 @@ typedef struct {
/* Global variables. */
static bool g_usbDeviceInterfaceInitialized = false;
static usbDeviceInterface g_usbDeviceInterface = {0};
static RwLock g_usbDeviceLock = {0};
static usbDeviceInterface g_usbDeviceInterface = {0};
static bool g_usbDeviceInterfaceInitialized = false;
static bool g_usbSessionStarted = false;
static Event *g_usbStateChangeEvent = NULL;
static thrd_t g_usbDetectionThread;
static UEvent g_usbDetectionThreadExitEvent = {0};
static bool g_usbDetectionThreadCreated = false, g_usbHostAvailable = false, g_usbSessionStarted = false;
static u8 *g_usbTransferBuffer = NULL;
static u64 g_usbTransferRemainingSize = 0;
/* Function prototypes. */
static bool _usbStartSession(void);
static bool usbCreateDetectionThread(void);
static void usbDestroyDetectionThread(void);
static int usbDetectionThreadFunc(void *arg);
static bool usbStartSession(void);
static void usbEndSession(void);
NX_INLINE void usbPrepareCommandHeader(u32 cmd, u32 cmd_block_size);
static u32 usbSendCommand(size_t cmd_size);
@ -152,6 +159,20 @@ bool usbInitialize(void)
goto exit;
}
/* Retrieve USB state change kernel event */
g_usbStateChangeEvent = usbDsGetStateChangeEvent();
if (!g_usbStateChangeEvent)
{
LOGFILE("Failed to retrieve USB state change kernel event!");
goto exit;
}
/* Create usermode exit event */
ueventCreate(&g_usbDetectionThreadExitEvent, true);
/* Create USB detection thread */
if (!(g_usbDetectionThreadCreated = usbCreateDetectionThread())) goto exit;
ret = true;
exit:
@ -164,6 +185,16 @@ void usbExit(void)
{
rwlockWriteLock(&g_usbDeviceLock);
/* Destroy USB detection thread */
if (g_usbDetectionThreadCreated)
{
usbDestroyDetectionThread();
g_usbDetectionThreadCreated = false;
}
/* Clear USB state change kernel event */
g_usbStateChangeEvent = NULL;
/* Close USB device interface */
usbCloseComms();
@ -183,38 +214,13 @@ void *usbAllocatePageAlignedBuffer(size_t size)
return memalign(USB_TRANSFER_ALIGNMENT, size);
}
bool usbStartSession(void)
bool usbIsReady(void)
{
rwlockWriteLock(&g_usbDeviceLock);
rwlockWriteLock(&(g_usbDeviceInterface.lock));
bool ret = g_usbSessionStarted;
if (ret) goto exit;
time_t start = time(NULL);
time_t now = start;
while((now - start) < USB_SESSION_START_TIMEOUT)
{
if (usbIsHostAvailable())
{
/* Once the console has been connected to a host device, there's no need to keep running this loop */
/* usbTransferData() implements its own timeout */
ret = _usbStartSession();
break;
}
/* Continuously running usbDsGetState() can potentially hang up the system, so let's add a small sleep */
utilsSleep(1);
now = time(NULL);
}
if (ret) g_usbSessionStarted = true;
exit:
bool ret = (g_usbHostAvailable && g_usbSessionStarted);
rwlockWriteUnlock(&(g_usbDeviceInterface.lock));
rwlockWriteUnlock(&g_usbDeviceLock);
return ret;
}
@ -229,7 +235,7 @@ bool usbSendFileProperties(u64 file_size, const char *filename)
u32 status = UsbStatusType_Success;
u32 filename_length = 0;
if (!g_usbTransferBuffer || !g_usbDeviceInterfaceInitialized || !g_usbDeviceInterface.initialized || !g_usbSessionStarted || g_usbTransferRemainingSize > 0 || !filename || \
if (!g_usbTransferBuffer || !g_usbDeviceInterfaceInitialized || !g_usbDeviceInterface.initialized || !g_usbHostAvailable || !g_usbSessionStarted || g_usbTransferRemainingSize > 0 || !filename || \
!(filename_length = (u32)strlen(filename)) || filename_length >= FS_MAX_PATH)
{
LOGFILE("Invalid parameters!");
@ -272,8 +278,8 @@ bool usbSendFileData(void *data, u64 data_size)
void *buf = NULL;
UsbStatus *cmd_status = NULL;
if (!g_usbTransferBuffer || !g_usbDeviceInterfaceInitialized || !g_usbDeviceInterface.initialized || !g_usbSessionStarted || !g_usbTransferRemainingSize || !data || !data_size || \
data_size > USB_TRANSFER_BUFFER_SIZE || data_size > g_usbTransferRemainingSize)
if (!g_usbTransferBuffer || !g_usbDeviceInterfaceInitialized || !g_usbDeviceInterface.initialized || !g_usbHostAvailable || !g_usbSessionStarted || !g_usbTransferRemainingSize || !data || \
!data_size || data_size > USB_TRANSFER_BUFFER_SIZE || data_size > g_usbTransferRemainingSize)
{
LOGFILE("Invalid parameters!");
goto exit;
@ -329,29 +335,78 @@ exit:
return ret;
}
void usbEndSession(void)
static bool usbCreateDetectionThread(void)
{
rwlockWriteLock(&g_usbDeviceLock);
rwlockWriteLock(&(g_usbDeviceInterface.lock));
if (!g_usbTransferBuffer || !g_usbDeviceInterfaceInitialized || !g_usbDeviceInterface.initialized || !g_usbSessionStarted)
if (thrd_create(&g_usbDetectionThread, usbDetectionThreadFunc, NULL) != thrd_success)
{
LOGFILE("Invalid parameters!");
goto exit;
LOGFILE("Failed to create USB detection thread!");
return false;
}
usbPrepareCommandHeader(UsbCommandType_EndSession, 0);
if (!usbWrite(g_usbTransferBuffer, sizeof(UsbCommandHeader))) LOGFILE("Failed to send EndSession command!");
g_usbSessionStarted = false;
exit:
rwlockWriteUnlock(&(g_usbDeviceInterface.lock));
rwlockWriteUnlock(&g_usbDeviceLock);
return true;
}
static bool _usbStartSession(void)
static void usbDestroyDetectionThread(void)
{
/* Signal the exit event to terminate the USB detection thread */
ueventSignal(&g_usbDetectionThreadExitEvent);
/* Wait for the USB detection thread to exit */
thrd_join(g_usbDetectionThread, NULL);
}
static int usbDetectionThreadFunc(void *arg)
{
(void)arg;
Result rc = 0;
int idx = 0;
bool prev_status = false;
Waiter usb_event_waiter = waiterForEvent(g_usbStateChangeEvent);
Waiter exit_event_waiter = waiterForUEvent(&g_usbDetectionThreadExitEvent);
while(true)
{
/* Wait until an event is triggered */
rc = waitMulti(&idx, -1, usb_event_waiter, exit_event_waiter);
if (R_FAILED(rc)) continue;
/* Exit event triggered */
if (idx == 1) break;
/* Retrieve current USB connection status */
/* Only proceed if we're dealing with a status change */
rwlockWriteLock(&g_usbDeviceLock);
rwlockWriteLock(&(g_usbDeviceInterface.lock));
g_usbHostAvailable = usbIsHostAvailable();
g_usbTransferRemainingSize = 0;
if (!prev_status && g_usbHostAvailable)
{
/* Start a USB session */
/* This will essentially hang this thread and all other threads that call USB-related functions until a session is established */
g_usbSessionStarted = usbStartSession();
} else {
/* Update USB session flag */
g_usbSessionStarted = false;
}
prev_status = g_usbHostAvailable;
rwlockWriteUnlock(&(g_usbDeviceInterface.lock));
rwlockWriteUnlock(&g_usbDeviceLock);
}
/* Close USB session if needed */
if (g_usbHostAvailable && g_usbSessionStarted) usbEndSession();
g_usbHostAvailable = g_usbSessionStarted = false;
return 0;
}
static bool usbStartSession(void)
{
UsbCommandStartSession *cmd_block = NULL;
size_t cmd_size = 0;
@ -381,6 +436,19 @@ static bool _usbStartSession(void)
return (status == UsbStatusType_Success);
}
static void usbEndSession(void)
{
if (!g_usbTransferBuffer || !g_usbDeviceInterfaceInitialized || !g_usbDeviceInterface.initialized || !g_usbHostAvailable || !g_usbSessionStarted)
{
LOGFILE("Invalid parameters!");
return;
}
usbPrepareCommandHeader(UsbCommandType_EndSession, 0);
if (!usbWrite(g_usbTransferBuffer, sizeof(UsbCommandHeader))) LOGFILE("Failed to send EndSession command!");
}
NX_INLINE void usbPrepareCommandHeader(u32 cmd, u32 cmd_block_size)
{
if (cmd > UsbCommandType_EndSession) return;
@ -903,9 +971,7 @@ NX_INLINE bool usbIsHostAvailable(void)
{
u32 state = 0;
Result rc = usbDsGetState(&state);
bool ret = (R_SUCCEEDED(rc) && state == 5);
if (!ret) g_usbSessionStarted = false;
return ret;
return (R_SUCCEEDED(rc) && state == 5);
}
NX_INLINE bool usbRead(void *buf, u64 size)

12
source/usb.h
View file

@ -32,18 +32,16 @@ void usbExit(void);
/// Returns a pointer to a heap-allocated, page-aligned memory buffer that's suitable for USB transfers.
void *usbAllocatePageAlignedBuffer(size_t size);
/// Starts a data transfer session with the connected host device. Returns true if the host device replies with valid data within a certain time span.
/// This should be called before usbSendFileProperties().
bool usbStartSession(void);
/// Used to check if the console has been connected to an USB host device and if a valid USB session has been established.
/// Bear in mind this call will block the calling thread if the console is connected to an USB host device but no USB session has been established.
/// If the console is disconnected during this block, the function will return false.
bool usbIsReady(void);
/// Sends file properties to the host device before starting a file data transfer. Must be called before usbSendFileData(), and after usbStartSession().
/// Sends file properties to the host device before starting a file data transfer. Must be called before usbSendFileData().
bool usbSendFileProperties(u64 file_size, const char *filename);
/// Performs a file data transfer. Must be continuously called after usbSendFileProperties() until all file data has been transferred.
/// Data chunk size must not exceed USB_TRANSFER_BUFFER_SIZE.
bool usbSendFileData(void *data, u64 data_size);
/// Ends a previously started data transfer session with the connected host device.
void usbEndSession(void);
#endif /* __USB_H__ */