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staging: comedi: comedi_usb.c: improve function documentation

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Expand the descriptions of the functions and document the return values.

Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Reviewed-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Ian Abbott 2015-09-30 17:37:13 +01:00 committed by Greg Kroah-Hartman
parent 127a0cf9b0
commit ddf837ea95
1 changed files with 52 additions and 23 deletions
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75
drivers/staging/comedi/comedi_usb.c
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@ -21,8 +21,14 @@
#include "comedi_usb.h"
/**
* comedi_to_usb_interface() - comedi_device pointer to usb_interface pointer.
* @dev: comedi_device struct
* comedi_to_usb_interface() - Return USB interface attached to COMEDI device
* @dev: COMEDI device.
*
* Assuming @dev->hw_dev is non-%NULL, it is assumed to be pointing to a
* a &struct device embedded in a &struct usb_interface.
*
* Return: Attached USB interface if @dev->hw_dev is non-%NULL.
* Return %NULL if @dev->hw_dev is %NULL.
*/
struct usb_interface *comedi_to_usb_interface(struct comedi_device *dev)
{
@ -31,8 +37,14 @@ struct usb_interface *comedi_to_usb_interface(struct comedi_device *dev)
EXPORT_SYMBOL_GPL(comedi_to_usb_interface);
/**
* comedi_to_usb_dev() - comedi_device pointer to usb_device pointer.
* @dev: comedi_device struct
* comedi_to_usb_dev() - Return USB device attached to COMEDI device
* @dev: COMEDI device.
*
* Assuming @dev->hw_dev is non-%NULL, it is assumed to be pointing to a
* a &struct device embedded in a &struct usb_interface.
*
* Return: USB device to which the USB interface belongs if @dev->hw_dev is
* non-%NULL. Return %NULL if @dev->hw_dev is %NULL.
*/
struct usb_device *comedi_to_usb_dev(struct comedi_device *dev)
{
@ -43,12 +55,19 @@ struct usb_device *comedi_to_usb_dev(struct comedi_device *dev)
EXPORT_SYMBOL_GPL(comedi_to_usb_dev);
/**
* comedi_usb_auto_config() - Configure/probe a comedi USB driver.
* @intf: usb_interface struct
* @driver: comedi_driver struct
* @context: driver specific data, passed to comedi_auto_config()
* comedi_usb_auto_config() - Configure/probe a USB COMEDI driver
* @intf: USB interface.
* @driver: Registered COMEDI driver.
* @context: Driver specific data, passed to comedi_auto_config().
*
* Typically called from the usb_driver (*probe) function.
* Typically called from the usb_driver (*probe) function. Auto-configure a
* COMEDI device, using a pointer to the &struct device embedded in *@intf as
* the hardware device. The @context value gets passed through to @driver's
* "auto_attach" handler. The "auto_attach" handler may call
* comedi_to_usb_interface() on the passed in COMEDI device to recover @intf.
*
* Return: The result of calling comedi_auto_config() (%0 on success, or
* a negative error number on failure).
*/
int comedi_usb_auto_config(struct usb_interface *intf,
struct comedi_driver *driver,
@ -59,10 +78,18 @@ int comedi_usb_auto_config(struct usb_interface *intf,
EXPORT_SYMBOL_GPL(comedi_usb_auto_config);
/**
* comedi_pci_auto_unconfig() - Unconfigure/disconnect a comedi USB driver.
* @intf: usb_interface struct
* comedi_usb_auto_unconfig() - Unconfigure/disconnect a USB COMEDI device
* @intf: USB interface.
*
* Typically called from the usb_driver (*disconnect) function.
* Auto-unconfigure a COMEDI device attached to this USB interface, using a
* pointer to the &struct device embedded in *@intf as the hardware device.
* The COMEDI driver's "detach" handler will be called during unconfiguration
* of the COMEDI device.
*
* Note that the COMEDI device may have already been unconfigured using the
* %COMEDI_DEVCONFIG ioctl, in which case this attempt to unconfigure it
* again should be ignored.
*/
void comedi_usb_auto_unconfig(struct usb_interface *intf)
{
@ -71,13 +98,15 @@ void comedi_usb_auto_unconfig(struct usb_interface *intf)
EXPORT_SYMBOL_GPL(comedi_usb_auto_unconfig);
/**
* comedi_usb_driver_register() - Register a comedi USB driver.
* @comedi_driver: comedi_driver struct
* @usb_driver: usb_driver struct
* comedi_usb_driver_register() - Register a USB COMEDI driver
* @comedi_driver: COMEDI driver to be registered.
* @usb_driver: USB driver to be registered.
*
* This function is used for the module_init() of comedi USB drivers.
* Do not call it directly, use the module_comedi_usb_driver() helper
* macro instead.
* This function is called from the module_init() of USB COMEDI driver modules
* to register the COMEDI driver and the USB driver. Do not call it directly,
* use the module_comedi_usb_driver() helper macro instead.
*
* Return: %0 on success, or a negative error number on failure.
*/
int comedi_usb_driver_register(struct comedi_driver *comedi_driver,
struct usb_driver *usb_driver)
@ -99,13 +128,13 @@ int comedi_usb_driver_register(struct comedi_driver *comedi_driver,
EXPORT_SYMBOL_GPL(comedi_usb_driver_register);
/**
* comedi_usb_driver_unregister() - Unregister a comedi USB driver.
* @comedi_driver: comedi_driver struct
* @usb_driver: usb_driver struct
* comedi_usb_driver_unregister() - Unregister a USB COMEDI driver
* @comedi_driver: COMEDI driver to be registered.
* @usb_driver: USB driver to be registered.
*
* This function is used for the module_exit() of comedi USB drivers.
* Do not call it directly, use the module_comedi_usb_driver() helper
* macro instead.
* This function is called from the module_exit() of USB COMEDI driver modules
* to unregister the USB driver and the COMEDI driver. Do not call it
* directly, use the module_comedi_usb_driver() helper macro instead.
*/
void comedi_usb_driver_unregister(struct comedi_driver *comedi_driver,
struct usb_driver *usb_driver)