244 lines
8.6 KiB
C
244 lines
8.6 KiB
C
/*
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* Copyright (C) 2010 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef __USB_HOST_H
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#define __USB_HOST_H
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include <stdint.h>
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#include <linux/version.h>
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#if LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 20)
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#include <linux/usb/ch9.h>
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#else
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#include <linux/usb_ch9.h>
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#endif
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struct usb_host_context;
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struct usb_endpoint_descriptor;
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struct usb_descriptor_iter {
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unsigned char* config;
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unsigned char* config_end;
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unsigned char* curr_desc;
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};
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struct usb_request
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{
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struct usb_device *dev;
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void* buffer;
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int buffer_length;
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int actual_length;
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int max_packet_size;
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void *private_data; /* struct usbdevfs_urb* */
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int endpoint;
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void *client_data; /* free for use by client */
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};
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/* Callback for notification when new USB devices are attached.
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* Return true to exit from usb_host_run.
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*/
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typedef int (* usb_device_added_cb)(const char *dev_name, void *client_data);
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/* Callback for notification when USB devices are removed.
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* Return true to exit from usb_host_run.
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*/
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typedef int (* usb_device_removed_cb)(const char *dev_name, void *client_data);
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/* Callback indicating that initial device discovery is done.
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* Return true to exit from usb_host_run.
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*/
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typedef int (* usb_discovery_done_cb)(void *client_data);
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/* Call this to initialize the USB host library. */
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struct usb_host_context *usb_host_init(void);
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/* Call this to cleanup the USB host library. */
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void usb_host_cleanup(struct usb_host_context *context);
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/* Call this to get the inotify file descriptor. */
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int usb_host_get_fd(struct usb_host_context *context);
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/* Call this to initialize the usb host context. */
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int usb_host_load(struct usb_host_context *context,
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usb_device_added_cb added_cb,
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usb_device_removed_cb removed_cb,
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usb_discovery_done_cb discovery_done_cb,
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void *client_data);
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/* Call this to read and handle occuring usb event. */
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int usb_host_read_event(struct usb_host_context *context);
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/* Call this to monitor the USB bus for new and removed devices.
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* This is intended to be called from a dedicated thread,
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* as it will not return until one of the callbacks returns true.
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* added_cb will be called immediately for each existing USB device,
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* and subsequently each time a new device is added.
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* removed_cb is called when USB devices are removed from the bus.
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* discovery_done_cb is called after the initial discovery of already
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* connected devices is complete.
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*/
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void usb_host_run(struct usb_host_context *context,
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usb_device_added_cb added_cb,
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usb_device_removed_cb removed_cb,
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usb_discovery_done_cb discovery_done_cb,
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void *client_data);
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/* Creates a usb_device object for a USB device */
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struct usb_device *usb_device_open(const char *dev_name);
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/* Releases all resources associated with the USB device */
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void usb_device_close(struct usb_device *device);
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/* Creates a usb_device object for already open USB device */
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struct usb_device *usb_device_new(const char *dev_name, int fd);
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/* Returns the file descriptor for the usb_device */
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int usb_device_get_fd(struct usb_device *device);
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/* Returns the name for the USB device, which is the same as
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* the dev_name passed to usb_device_open()
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*/
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const char* usb_device_get_name(struct usb_device *device);
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/* Returns a unique ID for the device.
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*Currently this is generated from the dev_name path.
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*/
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int usb_device_get_unique_id(struct usb_device *device);
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/* Returns a unique ID for the device name.
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* Currently this is generated from the device path.
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*/
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int usb_device_get_unique_id_from_name(const char* name);
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/* Returns the device name for the unique ID.
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* Call free() to deallocate the returned string */
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char* usb_device_get_name_from_unique_id(int id);
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/* Returns the USB vendor ID from the device descriptor for the USB device */
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uint16_t usb_device_get_vendor_id(struct usb_device *device);
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/* Returns the USB product ID from the device descriptor for the USB device */
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uint16_t usb_device_get_product_id(struct usb_device *device);
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const struct usb_device_descriptor* usb_device_get_device_descriptor(struct usb_device *device);
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/* Returns a USB descriptor string for the given string ID.
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* Used to implement usb_device_get_manufacturer_name,
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* usb_device_get_product_name and usb_device_get_serial.
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* Call free() to free the result when you are done with it.
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*/
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char* usb_device_get_string(struct usb_device *device, int id);
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/* Returns the manufacturer name for the USB device.
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* Call free() to free the result when you are done with it.
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*/
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char* usb_device_get_manufacturer_name(struct usb_device *device);
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/* Returns the product name for the USB device.
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* Call free() to free the result when you are done with it.
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*/
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char* usb_device_get_product_name(struct usb_device *device);
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/* Returns the version number for the USB device.
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*/
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int usb_device_get_version(struct usb_device *device);
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/* Returns the USB serial number for the USB device.
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* Call free() to free the result when you are done with it.
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*/
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char* usb_device_get_serial(struct usb_device *device);
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/* Returns true if we have write access to the USB device,
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* and false if we only have access to the USB device configuration.
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*/
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int usb_device_is_writeable(struct usb_device *device);
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/* Initializes a usb_descriptor_iter, which can be used to iterate through all
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* the USB descriptors for a USB device.
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*/
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void usb_descriptor_iter_init(struct usb_device *device, struct usb_descriptor_iter *iter);
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/* Returns the next USB descriptor for a device, or NULL if we have reached the
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* end of the list.
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*/
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struct usb_descriptor_header *usb_descriptor_iter_next(struct usb_descriptor_iter *iter);
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/* Claims the specified interface of a USB device */
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int usb_device_claim_interface(struct usb_device *device, unsigned int interface);
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/* Releases the specified interface of a USB device */
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int usb_device_release_interface(struct usb_device *device, unsigned int interface);
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/* Requests the kernel to connect or disconnect its driver for the specified interface.
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* This can be used to ask the kernel to disconnect its driver for a device
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* so usb_device_claim_interface can claim it instead.
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*/
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int usb_device_connect_kernel_driver(struct usb_device *device,
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unsigned int interface, int connect);
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/* Sets the current configuration for the device to the specified configuration */
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int usb_device_set_configuration(struct usb_device *device, int configuration);
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/* Sets the specified interface of a USB device */
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int usb_device_set_interface(struct usb_device *device, unsigned int interface,
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unsigned int alt_setting);
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/* Sends a control message to the specified device on endpoint zero */
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int usb_device_control_transfer(struct usb_device *device,
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int requestType,
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int request,
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int value,
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int index,
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void* buffer,
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int length,
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unsigned int timeout);
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/* Reads or writes on a bulk endpoint.
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* Returns number of bytes transferred, or negative value for error.
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*/
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int usb_device_bulk_transfer(struct usb_device *device,
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int endpoint,
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void* buffer,
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int length,
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unsigned int timeout);
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/* Creates a new usb_request. */
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struct usb_request *usb_request_new(struct usb_device *dev,
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const struct usb_endpoint_descriptor *ep_desc);
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/* Releases all resources associated with the request */
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void usb_request_free(struct usb_request *req);
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/* Submits a read or write request on the specified device */
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int usb_request_queue(struct usb_request *req);
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/* Waits for the results of a previous usb_request_queue operation.
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* Returns a usb_request, or NULL for error.
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*/
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struct usb_request *usb_request_wait(struct usb_device *dev);
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/* Cancels a pending usb_request_queue() operation. */
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int usb_request_cancel(struct usb_request *req);
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#ifdef __cplusplus
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}
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#endif
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#endif /* __USB_HOST_H */
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