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| -rw-r--r-- | android.cpp | 79 |
1 files changed, 79 insertions, 0 deletions
diff --git a/android.cpp b/android.cpp index 0b4aadb27..4e2b2b1d3 100644 --- a/android.cpp +++ b/android.cpp @@ -8,6 +8,10 @@ #include <QtAndroidExtras/QtAndroidExtras> #include <QtAndroidExtras/QAndroidJniObject> +#include <QtAndroid> + +#define FTDI_VID 0x0403 +#define USB_SERVICE "usb" extern "C" { @@ -51,6 +55,81 @@ int enumerate_devices(device_callback_t callback, void *userdata, int dc_type) return -1; } +/** + * Get the file descriptor of first available ftdi device attached to usb in android. + * This is needed for dc_device_open on android. + * + * return + * -1 : No Usb Device is attached. + * -2 : No ftdi device found. + * -3 : No permission for using the device + * -4 : Error while opening the device. + * +ve num : Successfully extracted file descriptor is returned. + * */ +int get_usb_fd() +{ + int i; + jint fd, vendorid, productid; + QAndroidJniObject usbName, usbDevice; + + // Get the current main activity of the application. + QAndroidJniObject activity = QtAndroid::androidActivity(); + + QAndroidJniObject usb_service = QAndroidJniObject::fromString(USB_SERVICE); + + // Get UsbManager from activity + QAndroidJniObject usbManager = activity.callObjectMethod("getSystemService", "(Ljava/lang/String;)Ljava/lang/Object;", usb_service.object()); + + // Get a HashMap<Name, UsbDevice> of all USB devices attached to Android + QAndroidJniObject deviceMap = usbManager.callObjectMethod("getDeviceList", "()Ljava/util/HashMap;"); + jint num_devices = deviceMap.callMethod<jint>("size", "()I"); + if (num_devices == 0) { + // No USB device is attached. + return -1; + } + + // Iterate over all the devices and find the first available FTDI device. + QAndroidJniObject keySet = deviceMap.callObjectMethod("keySet", "()Ljava/util/Set;"); + QAndroidJniObject iterator = keySet.callObjectMethod("iterator", "()Ljava/util/Iterator;"); + + for (i = 0; i < num_devices; i++) { + usbName = iterator.callObjectMethod("next", "()Ljava/lang/Object;"); + usbDevice = deviceMap.callObjectMethod ("get", "(Ljava/lang/Object;)Ljava/lang/Object;", usbName.object()); + vendorid = usbDevice.callMethod<jint>("getVendorId", "()I"); + productid = usbDevice.callMethod<jint>("getProductId", "()I"); + if(vendorid == FTDI_VID) // Found a FTDI device. Break. + break; + } + if (i == num_devices) { + // No ftdi device found. + return -2; + } + + jboolean hasPermission = usbManager.callMethod<jboolean>("hasPermission", "(Landroid/hardware/usb/UsbDevice;)Z", usbDevice.object()); + if (!hasPermission) { + // You do not have permission to use the usbDevice. + // Please remove and reinsert the USB device. + // Could also give an dialogbox asking for permission. + return -3; + } + + // An FTDI device is present and we also have permission to use the device. + // Open the device and get its file descriptor. + QAndroidJniObject usbDeviceConnection = usbManager.callObjectMethod("openDevice", "(Landroid/hardware/usb/UsbDevice;)Landroid/hardware/usb/UsbDeviceConnection;", usbDevice.object()); + if (usbDeviceConnection.object() == NULL) { + // Some error occurred while opening the device. Exit. + return -4; + } + + // Finally get the required file descriptor. + fd = usbDeviceConnection.callMethod<jint>("getFileDescriptor", "()I"); + if (fd == -1) { + // The device is not opened. Some error. + return -4; + } + return fd; +} + /* NOP wrappers to comform with windows.c */ int subsurface_rename(const char *path, const char *newpath) { |