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/*
* 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>
#include <linux/version.h>
#if LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 20)
#include <linux/usb/ch9.h>
#else
#include <linux/usb_ch9.h>
#endif
struct usb_host_context;
struct usb_endpoint_descriptor;
struct usb_descriptor_iter {
unsigned char* config;
unsigned char* config_end;
unsigned char* curr_desc;
};
struct usb_request
{
struct usb_device *dev;
void* buffer;
int buffer_length;
int actual_length;
int max_packet_size;
void *private_data; /* struct usbdevfs_urb* */
int endpoint;
void *client_data; /* free for use by client */
};
/* Callback for notification when new USB devices are attached.
* Return true to exit from usb_host_run.
*/
typedef int (* usb_device_added_cb)(const char *dev_name, void *client_data);
/* Callback for notification when USB devices are removed.
* Return true to exit from usb_host_run.
*/
typedef int (* usb_device_removed_cb)(const char *dev_name, void *client_data);
/* Callback indicating that initial device discovery is done.
* Return true to exit from usb_host_run.
*/
typedef int (* usb_discovery_done_cb)(void *client_data);
/* Call this to initialize the USB host library. */
struct usb_host_context *usb_host_init(void);
/* Call this to cleanup the USB host library. */
void usb_host_cleanup(struct usb_host_context *context);
/* Call this to monitor the USB bus for new and removed devices.
* This is intended to be called from a dedicated thread,
* as it will not return until one of the callbacks returns true.
* 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.
* discovery_done_cb is called after the initial discovery of already
* connected devices is complete.
*/
void usb_host_run(struct usb_host_context *context,
usb_device_added_cb added_cb,
usb_device_removed_cb removed_cb,
usb_discovery_done_cb discovery_done_cb,
void *client_data);
/* 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);
/* Creates a usb_device object for already open USB device */
struct usb_device *usb_device_new(const char *dev_name, int fd);
/* Returns the file descriptor for the usb_device */
int usb_device_get_fd(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 a unique ID for the device.
*Currently this is generated from the dev_name path.
*/
int usb_device_get_unique_id(struct usb_device *device);
/* Returns a unique ID for the device name.
* Currently this is generated from the device path.
*/
int usb_device_get_unique_id_from_name(const char* name);
/* Returns the device name for the unique ID.
* Call free() to deallocate the returned string */
char* usb_device_get_name_from_unique_id(int id);
/* 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);
const struct usb_device_descriptor* usb_device_get_device_descriptor(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);
/* Requests the kernel to connect or disconnect its driver for the specified interface.
* This can be used to ask the kernel to disconnect its driver for a device
* so usb_device_claim_interface can claim it instead.
*/
int usb_device_connect_kernel_driver(struct usb_device *device,
unsigned int interface, int connect);
/* Sends a control message to the specified device on endpoint zero */
int usb_device_control_transfer(struct usb_device *device,
int requestType,
int request,
int value,
int index,
void* buffer,
int length,
unsigned int timeout);
/* Reads or writes on a bulk endpoint.
* Returns number of bytes transferred, or negative value for error.
*/
int usb_device_bulk_transfer(struct usb_device *device,
int endpoint,
void* buffer,
int length,
unsigned int timeout);
/* Creates a new usb_request. */
struct usb_request *usb_request_new(struct usb_device *dev,
const struct usb_endpoint_descriptor *ep_desc);
/* Releases all resources associated with the request */
void usb_request_free(struct usb_request *req);
/* Submits a read or write request on the specified device */
int usb_request_queue(struct usb_request *req);
/* Waits for the results of a previous usb_request_queue operation.
* Returns a usb_request, or NULL for error.
*/
struct usb_request *usb_request_wait(struct usb_device *dev);
/* Cancels a pending usb_request_queue() operation. */
int usb_request_cancel(struct usb_request *req);
#ifdef __cplusplus
}
#endif
#endif /* __USB_HOST_H */
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