1 files changed, 87 insertions, 0 deletions
diff --git a/host/usb.c b/host/usb.c
new file mode 100644
index 0000000..1d3aaf4
--- /dev/null
+++ b/host/usb.c
@@ -0,0 +1,87 @@
+#include <stdlib.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <errno.h>
+#include <usb.h>
+#include <sys/ioctl.h>
+#include "usb.h"
+#include <linux/usbdevice_fs.h>
+
+#define MAX_READ_WRITE	4096
+
+#define USB_ERROR_STR(ret, x, args...)	return ret
+
+static int usb_get_fd(usb_dev_handle *uh)
+{
+	return *((int *)uh);
+}
+
+int __usb_bulk_write(usb_dev_handle *dev, int ep, char *bytes, int length,
+		     int timeout)
+{
+	struct usbdevfs_bulktransfer bulk;
+	int ret, sent = 0;
+
+	/* Ensure the endpoint address is correct */
+	ep &= ~USB_ENDPOINT_IN;
+
+	do {
+		bulk.ep = ep;
+		bulk.len = length - sent;
+		if (bulk.len > MAX_READ_WRITE)
+			bulk.len = MAX_READ_WRITE;
+		bulk.timeout = timeout;
+		bulk.data = (unsigned char *)bytes + sent;
+
+		ret = ioctl(usb_get_fd(dev), USBDEVFS_BULK, &bulk);
+		if (ret < 0)
+			USB_ERROR_STR(ret,
+				      "error writing to bulk endpoint %d: %s",
+				      ep, strerror(errno));
+
+		sent += ret;
+	} while (ret > 0 && sent < length);
+
+	return sent;
+}
+
+int __usb_bulk_read(usb_dev_handle *dev, int ep, char *bytes, int size,
+		    int timeout)
+{
+	struct usbdevfs_bulktransfer bulk;
+	int ret, retrieved = 0, requested;
+
+	/* Ensure the endpoint address is correct */
+	ep |= USB_ENDPOINT_IN;
+
+	do {
+		bulk.ep = ep;
+		requested = size - retrieved;
+		if (requested > MAX_READ_WRITE)
+			requested = MAX_READ_WRITE;
+		bulk.len = requested;
+		bulk.timeout = timeout;
+		bulk.data = (unsigned char *)bytes + retrieved;
+
+		ret = ioctl(usb_get_fd(dev), USBDEVFS_BULK, &bulk);
+		if (ret < 0)
+			USB_ERROR_STR(ret,
+				      "error reading from bulk endpoint 0x%x: %s",
+				      ep, strerror(errno));
+
+		retrieved += ret;
+	} while (ret > 0 && retrieved < size && ret == requested);
+
+	return retrieved;
+}
+
+int __usb_reattach_kernel_driver_np(usb_dev_handle *dev, int interface)
+{
+	struct usbdevfs_ioctl command;
+
+	command.ifno = interface;
+	command.ioctl_code = USBDEVFS_CONNECT;
+	command.data = NULL;
+
+	return ioctl(usb_get_fd(dev), USBDEVFS_IOCTL, &command);
+}