/* * 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 #include #if LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 20) #include #else #include #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 get the inotify file descriptor. */ int usb_host_get_fd(struct usb_host_context *context); /* Call this to initialize the usb host context. */ int usb_host_load(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); /* Call this to read and handle occuring usb event. */ int usb_host_read_event(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 */