| 1 | |
| 2 | |
| 3 | * comedi_usb.c
|
| 4 | * Comedi USB driver specific functions.
|
| 5 | *
|
| 6 | * COMEDI - Linux Control and Measurement Device Interface
|
| 7 | * Copyright (C) 1997-2000 David A. Schleef <[email protected]>
|
| 8 |
|
| 9 |
|
| 10 | #include <linux/module.h>
|
| 11 | #include <linux/comedi/comedi_usb.h>
|
| 12 |
|
| 13 | |
| 14 | * comedi_to_usb_interface() - Return USB interface attached to COMEDI device
|
| 15 | * @dev: COMEDI device.
|
| 16 | *
|
| 17 | * Assuming @dev->hw_dev is non-%NULL, it is assumed to be pointing to a
|
| 18 | * a &struct device embedded in a &struct usb_interface.
|
| 19 | *
|
| 20 | * Return: Attached USB interface if @dev->hw_dev is non-%NULL.
|
| 21 | * Return %NULL if @dev->hw_dev is %NULL.
|
| 22 |
|
| 23 | struct usb_interface *comedi_to_usb_interface(struct comedi_device *dev)
|
| 24 | {
|
| 25 | return dev->hw_dev ? to_usb_interface(dev->hw_dev) : NULL;
|
| 26 | }
|
| 27 | EXPORT_SYMBOL_GPL(comedi_to_usb_interface);
|
| 28 |
|
| 29 | |
| 30 | * comedi_to_usb_dev() - Return USB device attached to COMEDI device
|
| 31 | * @dev: COMEDI device.
|
| 32 | *
|
| 33 | * Assuming @dev->hw_dev is non-%NULL, it is assumed to be pointing to a
|
| 34 | * a &struct device embedded in a &struct usb_interface.
|
| 35 | *
|
| 36 | * Return: USB device to which the USB interface belongs if @dev->hw_dev is
|
| 37 | * non-%NULL. Return %NULL if @dev->hw_dev is %NULL.
|
| 38 |
|
| 39 | struct usb_device *comedi_to_usb_dev(struct comedi_device *dev)
|
| 40 | {
|
| 41 | struct usb_interface *intf = comedi_to_usb_interface(dev);
|
| 42 |
|
| 43 | return intf ? interface_to_usbdev(intf) : NULL;
|
| 44 | }
|
| 45 | EXPORT_SYMBOL_GPL(comedi_to_usb_dev);
|
| 46 |
|
| 47 | |
| 48 | * comedi_usb_auto_config() - Configure/probe a USB COMEDI driver
|
| 49 | * @intf: USB interface.
|
| 50 | * @driver: Registered COMEDI driver.
|
| 51 | * @context: Driver specific data, passed to comedi_auto_config().
|
| 52 | *
|
| 53 | * Typically called from the usb_driver (*probe) function. Auto-configure a
|
| 54 | * COMEDI device, using a pointer to the &struct device embedded in *@intf as
|
| 55 | * the hardware device. The @context value gets passed through to @driver's
|
| 56 | * "auto_attach" handler. The "auto_attach" handler may call
|
| 57 | * comedi_to_usb_interface() on the passed in COMEDI device to recover @intf.
|
| 58 | *
|
| 59 | * Return: The result of calling comedi_auto_config() (%0 on success, or
|
| 60 | * a negative error number on failure).
|
| 61 |
|
| 62 | int comedi_usb_auto_config(struct usb_interface *intf,
|
| 63 | struct comedi_driver *driver,
|
| 64 | unsigned long context)
|
| 65 | {
|
| 66 | return comedi_auto_config(&intf->dev, driver, context);
|
| 67 | }
|
| 68 | EXPORT_SYMBOL_GPL(comedi_usb_auto_config);
|
| 69 |
|
| 70 | |
| 71 | * comedi_usb_auto_unconfig() - Unconfigure/disconnect a USB COMEDI device
|
| 72 | * @intf: USB interface.
|
| 73 | *
|
| 74 | * Typically called from the usb_driver (*disconnect) function.
|
| 75 | * Auto-unconfigure a COMEDI device attached to this USB interface, using a
|
| 76 | * pointer to the &struct device embedded in *@intf as the hardware device.
|
| 77 | * The COMEDI driver's "detach" handler will be called during unconfiguration
|
| 78 | * of the COMEDI device.
|
| 79 | *
|
| 80 | * Note that the COMEDI device may have already been unconfigured using the
|
| 81 | * %COMEDI_DEVCONFIG ioctl, in which case this attempt to unconfigure it
|
| 82 | * again should be ignored.
|
| 83 |
|
| 84 | void comedi_usb_auto_unconfig(struct usb_interface *intf)
|
| 85 | {
|
| 86 | comedi_auto_unconfig(&intf->dev);
|
| 87 | }
|
| 88 | EXPORT_SYMBOL_GPL(comedi_usb_auto_unconfig);
|
| 89 |
|
| 90 | |
| 91 | * comedi_usb_driver_register() - Register a USB COMEDI driver
|
| 92 | * @comedi_driver: COMEDI driver to be registered.
|
| 93 | * @usb_driver: USB driver to be registered.
|
| 94 | *
|
| 95 | * This function is called from the module_init() of USB COMEDI driver modules
|
| 96 | * to register the COMEDI driver and the USB driver. Do not call it directly,
|
| 97 | * use the module_comedi_usb_driver() helper macro instead.
|
| 98 | *
|
| 99 | * Return: %0 on success, or a negative error number on failure.
|
| 100 |
|
| 101 | int comedi_usb_driver_register(struct comedi_driver *comedi_driver,
|
| 102 | struct usb_driver *usb_driver)
|
| 103 | {
|
| 104 | int ret;
|
| 105 |
|
| 106 | ret = comedi_driver_register(comedi_driver);
|
| 107 | if (ret < 0)
|
| 108 | return ret;
|
| 109 |
|
| 110 | ret = usb_register(usb_driver);
|
| 111 | if (ret < 0) {
|
| 112 | comedi_driver_unregister(comedi_driver);
|
| 113 | return ret;
|
| 114 | }
|
| 115 |
|
| 116 | return 0;
|
| 117 | }
|
| 118 | EXPORT_SYMBOL_GPL(comedi_usb_driver_register);
|
| 119 |
|
| 120 | |
| 121 | * comedi_usb_driver_unregister() - Unregister a USB COMEDI driver
|
| 122 | * @comedi_driver: COMEDI driver to be registered.
|
| 123 | * @usb_driver: USB driver to be registered.
|
| 124 | *
|
| 125 | * This function is called from the module_exit() of USB COMEDI driver modules
|
| 126 | * to unregister the USB driver and the COMEDI driver. Do not call it
|
| 127 | * directly, use the module_comedi_usb_driver() helper macro instead.
|
| 128 |
|
| 129 | void comedi_usb_driver_unregister(struct comedi_driver *comedi_driver,
|
| 130 | struct usb_driver *usb_driver)
|
| 131 | {
|
| 132 | usb_deregister(usb_driver);
|
| 133 | comedi_driver_unregister(comedi_driver);
|
| 134 | }
|
| 135 | EXPORT_SYMBOL_GPL(comedi_usb_driver_unregister);
|
| 136 |
|
| 137 | MODULE_AUTHOR("https://www.comedi.org");
|
| 138 | MODULE_DESCRIPTION("Comedi USB interface module");
|
| 139 | MODULE_LICENSE("GPL");
|