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staging: comedi: comedi_pci.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 2015-09-23 19:35:56 +01:00 committed by Greg Kroah-Hartman
parent 5e2ec8f9f3
commit 7a064fd13f
1 changed files with 80 additions and 28 deletions
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108
drivers/staging/comedi/comedi_pci.c
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@ -22,8 +22,14 @@
#include "comedi_pci.h"
/**
* comedi_to_pci_dev() - comedi_device pointer to pci_dev pointer.
* @dev: comedi_device struct
* comedi_to_pci_dev() - Return PCI 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 pci_dev.
*
* Returns: Attached PCI device if @dev->hw_dev is non-%NULL.
* Returns %NULL if @dev->hw_dev is %NULL.
*/
struct pci_dev *comedi_to_pci_dev(struct comedi_device *dev)
{
@ -32,8 +38,22 @@ struct pci_dev *comedi_to_pci_dev(struct comedi_device *dev)
EXPORT_SYMBOL_GPL(comedi_to_pci_dev);
/**
* comedi_pci_enable() - Enable the PCI device and request the regions.
* @dev: comedi_device struct
* comedi_pci_enable() - Enable the PCI device and request the regions
* @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 pci_dev. Enable the PCI device
* and request its regions. Set @dev->ioenabled to %true if successful,
* otherwise undo what was done.
*
* Calls to comedi_pci_enable() and comedi_pci_disable() cannot be nested.
*
* Returns:
* 0 on success,
* -%ENODEV if @dev->hw_dev is %NULL,
* -%EBUSY if regions busy,
* or some negative error number if failed to enable PCI device.
*
*/
int comedi_pci_enable(struct comedi_device *dev)
{
@ -58,8 +78,13 @@ int comedi_pci_enable(struct comedi_device *dev)
EXPORT_SYMBOL_GPL(comedi_pci_enable);
/**
* comedi_pci_disable() - Release the regions and disable the PCI device.
* @dev: comedi_device struct
* comedi_pci_disable() - Release the regions and disable the PCI 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 pci_dev. If the earlier call
* to comedi_pci_enable() was successful, release the PCI device's regions
* and disable it. Reset @dev->ioenabled back to %false.
*/
void comedi_pci_disable(struct comedi_device *dev)
{
@ -74,8 +99,18 @@ void comedi_pci_disable(struct comedi_device *dev)
EXPORT_SYMBOL_GPL(comedi_pci_disable);
/**
* comedi_pci_detach() - A generic (*detach) function for PCI drivers.
* @dev: comedi_device struct
* comedi_pci_detach() - A generic "detach" handler for PCI COMEDI drivers
* @dev: COMEDI device.
*
* COMEDI drivers for PCI devices that need no special clean-up of private data
* and have no ioremapped regions other than that pointed to by @dev->mmio may
* use this function as its "detach" handler called by the COMEDI core when a
* COMEDI device is being detached from the low-level driver. It may be also
* called from a more specific "detach" handler that does additional clean-up.
*
* Free the IRQ if @dev->irq is non-zero, iounmap @dev->mmio if it is
* non-%NULL, and call comedi_pci_disable() to release the PCI device's regions
* and disable it.
*/
void comedi_pci_detach(struct comedi_device *dev)
{
@ -97,12 +132,19 @@ void comedi_pci_detach(struct comedi_device *dev)
EXPORT_SYMBOL_GPL(comedi_pci_detach);
/**
* comedi_pci_auto_config() - Configure/probe a comedi PCI driver.
* @pcidev: pci_dev struct
* @driver: comedi_driver struct
* @context: driver specific data, passed to comedi_auto_config()
* comedi_pci_auto_config() - Configure/probe a PCI COMEDI device
* @pcidev: PCI device.
* @driver: Registered COMEDI driver.
* @context: Driver specific data, passed to comedi_auto_config().
*
* Typically called from the pci_driver (*probe) function.
* Typically called from the pci_driver (*probe) function. Auto-configure
* a COMEDI device, using the &struct device embedded in *@pcidev as the
* hardware device. The @context value gets passed through to @driver's
* "auto_attach" handler. The "auto_attach" handler may call
* comedi_to_pci_dev() on the passed in COMEDI device to recover @pcidev.
*
* Returns: The result of calling comedi_auto_config() (0 on success, or
* a negative error number on failure).
*/
int comedi_pci_auto_config(struct pci_dev *pcidev,
struct comedi_driver *driver,
@ -113,10 +155,18 @@ int comedi_pci_auto_config(struct pci_dev *pcidev,
EXPORT_SYMBOL_GPL(comedi_pci_auto_config);
/**
* comedi_pci_auto_unconfig() - Unconfigure/remove a comedi PCI driver.
* @pcidev: pci_dev struct
* comedi_pci_auto_unconfig() - Unconfigure/remove a PCI COMEDI device
* @pcidev: PCI device.
*
* Typically called from the pci_driver (*remove) function.
* Typically called from the pci_driver (*remove) function. Auto-unconfigure
* a COMEDI device attached to this PCI device, using a pointer to the
* &struct device embedded in *@pcidev 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_pci_auto_unconfig(struct pci_dev *pcidev)
{
@ -125,13 +175,15 @@ void comedi_pci_auto_unconfig(struct pci_dev *pcidev)
EXPORT_SYMBOL_GPL(comedi_pci_auto_unconfig);
/**
* comedi_pci_driver_register() - Register a comedi PCI driver.
* @comedi_driver: comedi_driver struct
* @pci_driver: pci_driver struct
* comedi_pci_driver_register() - Register a PCI COMEDI driver
* @comedi_driver: COMEDI driver to be registered.
* @pci_driver: PCI driver to be registered.
*
* This function is used for the module_init() of comedi PCI drivers.
* Do not call it directly, use the module_comedi_pci_driver() helper
* macro instead.
* This function is called from the module_init() of PCI COMEDI driver modules
* to register the COMEDI driver and the PCI driver. Do not call it directly,
* use the module_comedi_pci_driver() helper macro instead.
*
* Returns: 0 on success, or a negative error number on failure.
*/
int comedi_pci_driver_register(struct comedi_driver *comedi_driver,
struct pci_driver *pci_driver)
@ -153,13 +205,13 @@ int comedi_pci_driver_register(struct comedi_driver *comedi_driver,
EXPORT_SYMBOL_GPL(comedi_pci_driver_register);
/**
* comedi_pci_driver_unregister() - Unregister a comedi PCI driver.
* @comedi_driver: comedi_driver struct
* @pci_driver: pci_driver struct
* comedi_pci_driver_unregister() - Unregister a PCI COMEDI driver
* @comedi_driver: COMEDI driver to be unregistered.
* @pci_driver: PCI driver to be unregistered.
*
* This function is used for the module_exit() of comedi PCI drivers.
* Do not call it directly, use the module_comedi_pci_driver() helper
* macro instead.
* This function is called from the module_exit() of PCI COMEDI driver modules
* to unregister the PCI driver and the COMEDI driver. Do not call it
* directly, use the module_comedi_pci_driver() helper macro instead.
*/
void comedi_pci_driver_unregister(struct comedi_driver *comedi_driver,
struct pci_driver *pci_driver)