libusbhost: new library for Linux USB host support.
Supports access to Linux usbdevfs on both device and Linux host.
Change-Id: Ie88a5193be3ee715792b10b34b3da32ffc4ca57b
Signed-off-by: Mike Lockwood <lockwood@android.com>
diff --git a/include/usbhost/usbhost.h b/include/usbhost/usbhost.h
new file mode 100644
index 0000000..29b6ea3
--- /dev/null
+++ b/include/usbhost/usbhost.h
@@ -0,0 +1,140 @@
+/*
+ * Copyright (C) 2010 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef __USB_HOST_H
+#define __USB_HOST_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <stdint.h>
+
+struct usb_endpoint_descriptor;
+
+struct usb_descriptor_iter {
+ unsigned char* config;
+ unsigned char* config_end;
+ unsigned char* curr_desc;
+};
+
+/* callback for notification when new USB devices are attached */
+typedef void (* usb_device_added_cb)(const char *dev_name);
+
+/* callback for notification when USB devices are removed */
+typedef void (* usb_device_removed_cb)(const char *dev_name);
+
+/* Call this to start monitoring the USB bus.
+ * added_cb will be called immediately for each existing USB device,
+ * and subsequently each time a new device is added.
+ * removed_cb is called when USB devices are removed from the bus.
+ */
+int usb_host_init(usb_device_added_cb added_cb, usb_device_removed_cb removed_cb);
+
+/* Creates a usb_device object for a USB device */
+struct usb_device *usb_device_open(const char *dev_name);
+
+/* Releases all resources associated with the USB device */
+void usb_device_close(struct usb_device *device);
+
+/* Returns the name for the USB device, which is the same as
+ * the dev_name passed to usb_device_open()
+ */
+const char* usb_device_get_name(struct usb_device *device);
+
+/* Returns the USB vendor ID from the device descriptor for the USB device */
+uint16_t usb_device_get_vendor_id(struct usb_device *device);
+
+/* Returns the USB product ID from the device descriptor for the USB device */
+uint16_t usb_device_get_product_id(struct usb_device *device);
+
+/* Returns a USB descriptor string for the given string ID.
+ * Used to implement usb_device_get_manufacturer_name,
+ * usb_device_get_product_name and usb_device_get_serial.
+ * Call free() to free the result when you are done with it.
+ */
+char* usb_device_get_string(struct usb_device *device, int id);
+
+/* Returns the manufacturer name for the USB device.
+ * Call free() to free the result when you are done with it.
+ */
+char* usb_device_get_manufacturer_name(struct usb_device *device);
+
+/* Returns the product name for the USB device.
+ * Call free() to free the result when you are done with it.
+ */
+char* usb_device_get_product_name(struct usb_device *device);
+
+/* Returns the USB serial number for the USB device.
+ * Call free() to free the result when you are done with it.
+ */
+char* usb_device_get_serial(struct usb_device *device);
+
+/* Returns true if we have write access to the USB device,
+ * and false if we only have access to the USB device configuration.
+ */
+int usb_device_is_writeable(struct usb_device *device);
+
+/* Initializes a usb_descriptor_iter, which can be used to iterate through all
+ * the USB descriptors for a USB device.
+ */
+void usb_descriptor_iter_init(struct usb_device *device, struct usb_descriptor_iter *iter);
+
+/* Returns the next USB descriptor for a device, or NULL if we have reached the
+ * end of the list.
+ */
+struct usb_descriptor_header *usb_descriptor_iter_next(struct usb_descriptor_iter *iter);
+
+/* Claims the specified interface of a USB device */
+int usb_device_claim_interface(struct usb_device *device, unsigned int interface);
+
+/* Releases the specified interface of a USB device */
+int usb_device_release_interface(struct usb_device *device, unsigned int interface);
+
+
+/* Creates a new usb_endpoint for the specified endpoint of a USB device.
+ * This can be used to read or write data across the endpoint.
+ */
+struct usb_endpoint *usb_endpoint_open(struct usb_device *dev,
+ const struct usb_endpoint_descriptor *desc);
+
+/* Releases all resources associated with the endpoint */
+void usb_endpoint_close(struct usb_endpoint *ep);
+
+/* Begins a read or write operation on the specified endpoint */
+int usb_endpoint_queue(struct usb_endpoint *ep, void *data, int len);
+
+ /* Waits for the results of a previous usb_endpoint_queue operation on the
+ * specified endpoint. Returns number of bytes transferred, or a negative
+ * value for error.
+ */
+int usb_endpoint_wait(struct usb_device *device, int *out_ep_num);
+
+/* Cancels a pending usb_endpoint_queue() operation on an endpoint. */
+int usb_endpoint_cancel(struct usb_endpoint *ep);
+
+/* Returns the endpoint address for the given endpoint */
+int usb_endpoint_number(struct usb_endpoint *ep);
+
+/* Returns the maximum packet size for the given endpoint.
+ * For bulk endpoints this should be 512 for highspeed or 64 for fullspeed.
+ */
+int usb_endpoint_max_packet(struct usb_endpoint *ep);
+
+#ifdef __cplusplus
+}
+#endif
+#endif /* __USB_HOST_H */