151 lines
4.7 KiB
C
151 lines
4.7 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* comedi_usb.c
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* Comedi USB driver specific functions.
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*
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* COMEDI - Linux Control and Measurement Device Interface
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* Copyright (C) 1997-2000 David A. Schleef <ds@schleef.org>
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*/
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#include <linux/module.h>
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#include <linux/comedi/comedi_usb.h>
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/**
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* comedi_to_usb_interface() - Return USB interface attached to COMEDI device
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* @dev: COMEDI device.
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*
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* Assuming @dev->hw_dev is non-%NULL, it is assumed to be pointing to a
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* a &struct device embedded in a &struct usb_interface.
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*
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* Return: Attached USB interface if @dev->hw_dev is non-%NULL.
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* Return %NULL if @dev->hw_dev is %NULL.
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*/
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struct usb_interface *comedi_to_usb_interface(struct comedi_device *dev)
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{
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return dev->hw_dev ? to_usb_interface(dev->hw_dev) : NULL;
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}
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EXPORT_SYMBOL_GPL(comedi_to_usb_interface);
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/**
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* comedi_to_usb_dev() - Return USB device attached to COMEDI device
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* @dev: COMEDI device.
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*
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* Assuming @dev->hw_dev is non-%NULL, it is assumed to be pointing to a
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* a &struct device embedded in a &struct usb_interface.
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*
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* Return: USB device to which the USB interface belongs if @dev->hw_dev is
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* non-%NULL. Return %NULL if @dev->hw_dev is %NULL.
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*/
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struct usb_device *comedi_to_usb_dev(struct comedi_device *dev)
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{
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struct usb_interface *intf = comedi_to_usb_interface(dev);
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return intf ? interface_to_usbdev(intf) : NULL;
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}
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EXPORT_SYMBOL_GPL(comedi_to_usb_dev);
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/**
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* comedi_usb_auto_config() - Configure/probe a USB COMEDI driver
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* @intf: USB interface.
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* @driver: Registered COMEDI driver.
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* @context: Driver specific data, passed to comedi_auto_config().
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*
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* Typically called from the usb_driver (*probe) function. Auto-configure a
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* COMEDI device, using a pointer to the &struct device embedded in *@intf as
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* the hardware device. The @context value gets passed through to @driver's
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* "auto_attach" handler. The "auto_attach" handler may call
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* comedi_to_usb_interface() on the passed in COMEDI device to recover @intf.
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*
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* Return: The result of calling comedi_auto_config() (%0 on success, or
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* a negative error number on failure).
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*/
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int comedi_usb_auto_config(struct usb_interface *intf,
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struct comedi_driver *driver,
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unsigned long context)
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{
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return comedi_auto_config(&intf->dev, driver, context);
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}
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EXPORT_SYMBOL_GPL(comedi_usb_auto_config);
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/**
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* comedi_usb_auto_unconfig() - Unconfigure/disconnect a USB COMEDI device
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* @intf: USB interface.
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*
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* Typically called from the usb_driver (*disconnect) function.
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* Auto-unconfigure a COMEDI device attached to this USB interface, using a
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* pointer to the &struct device embedded in *@intf as the hardware device.
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* The COMEDI driver's "detach" handler will be called during unconfiguration
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* of the COMEDI device.
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*
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* Note that the COMEDI device may have already been unconfigured using the
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* %COMEDI_DEVCONFIG ioctl, in which case this attempt to unconfigure it
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* again should be ignored.
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*/
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void comedi_usb_auto_unconfig(struct usb_interface *intf)
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{
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comedi_auto_unconfig(&intf->dev);
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}
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EXPORT_SYMBOL_GPL(comedi_usb_auto_unconfig);
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/**
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* comedi_usb_driver_register() - Register a USB COMEDI driver
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* @comedi_driver: COMEDI driver to be registered.
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* @usb_driver: USB driver to be registered.
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*
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* This function is called from the module_init() of USB COMEDI driver modules
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* to register the COMEDI driver and the USB driver. Do not call it directly,
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* use the module_comedi_usb_driver() helper macro instead.
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*
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* Return: %0 on success, or a negative error number on failure.
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*/
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int comedi_usb_driver_register(struct comedi_driver *comedi_driver,
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struct usb_driver *usb_driver)
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{
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int ret;
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ret = comedi_driver_register(comedi_driver);
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if (ret < 0)
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return ret;
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ret = usb_register(usb_driver);
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if (ret < 0) {
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comedi_driver_unregister(comedi_driver);
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return ret;
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}
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return 0;
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}
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EXPORT_SYMBOL_GPL(comedi_usb_driver_register);
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/**
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* comedi_usb_driver_unregister() - Unregister a USB COMEDI driver
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* @comedi_driver: COMEDI driver to be registered.
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* @usb_driver: USB driver to be registered.
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*
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* This function is called from the module_exit() of USB COMEDI driver modules
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* to unregister the USB driver and the COMEDI driver. Do not call it
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* directly, use the module_comedi_usb_driver() helper macro instead.
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*/
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void comedi_usb_driver_unregister(struct comedi_driver *comedi_driver,
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struct usb_driver *usb_driver)
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{
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usb_deregister(usb_driver);
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comedi_driver_unregister(comedi_driver);
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}
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EXPORT_SYMBOL_GPL(comedi_usb_driver_unregister);
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static int __init comedi_usb_init(void)
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{
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return 0;
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}
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module_init(comedi_usb_init);
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static void __exit comedi_usb_exit(void)
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{
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}
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module_exit(comedi_usb_exit);
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MODULE_AUTHOR("https://www.comedi.org");
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MODULE_DESCRIPTION("Comedi USB interface module");
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MODULE_LICENSE("GPL");
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