1. 根目录:
2. drivers
3. staging
4. comedi
5. comedi_pci.c

/*
 * comedi_pci.c
 * Comedi PCI driver specific functions.
 *
 * COMEDI - Linux Control and Measurement Device Interface
 * Copyright (C) 1997-2000 David A. Schleef <ds@schleef.org>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 */

#include <linux/pci.h>

#include "comedidev.h"

/**
 * comedi_to_pci_dev() - comedi_device pointer to pci_dev pointer.
 * @dev: comedi_device struct
 */
struct pci_dev *comedi_to_pci_dev(struct comedi_device *dev)
{
	return dev->hw_dev ? to_pci_dev(dev->hw_dev) : NULL;
}
EXPORT_SYMBOL_GPL(comedi_to_pci_dev);

/**
 * comedi_pci_enable() - Enable the PCI device and request the regions.
 * @dev: comedi_device struct
 */
int comedi_pci_enable(struct comedi_device *dev)
{
	struct pci_dev *pcidev = comedi_to_pci_dev(dev);
	int rc;

	if (!pcidev)
		return -ENODEV;

	rc = pci_enable_device(pcidev);
	if (rc < 0)
		return rc;

	rc = pci_request_regions(pcidev, dev->board_name);
	if (rc < 0)
		pci_disable_device(pcidev);
	else
		dev->ioenabled = true;

	return rc;
}
EXPORT_SYMBOL_GPL(comedi_pci_enable);

/**
 * comedi_pci_disable() - Release the regions and disable the PCI device.
 * @dev: comedi_device struct
 */
void comedi_pci_disable(struct comedi_device *dev)
{
	struct pci_dev *pcidev = comedi_to_pci_dev(dev);

	if (pcidev && dev->ioenabled) {
		pci_release_regions(pcidev);
		pci_disable_device(pcidev);
	}
	dev->ioenabled = false;
}
EXPORT_SYMBOL_GPL(comedi_pci_disable);

/**
 * 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()
 *
 * Typically called from the pci_driver (*probe) function.
 */
int comedi_pci_auto_config(struct pci_dev *pcidev,
			   struct comedi_driver *driver,
			   unsigned long context)
{
	return comedi_auto_config(&pcidev->dev, driver, context);
}
EXPORT_SYMBOL_GPL(comedi_pci_auto_config);

/**
 * comedi_pci_auto_unconfig() - Unconfigure/remove a comedi PCI driver.
 * @pcidev: pci_dev struct
 *
 * Typically called from the pci_driver (*remove) function.
 */
void comedi_pci_auto_unconfig(struct pci_dev *pcidev)
{
	comedi_auto_unconfig(&pcidev->dev);
}
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
 *
 * 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.
 */
int comedi_pci_driver_register(struct comedi_driver *comedi_driver,
			       struct pci_driver *pci_driver)
{
	int ret;

	ret = comedi_driver_register(comedi_driver);
	if (ret < 0)
		return ret;

	ret = pci_register_driver(pci_driver);
	if (ret < 0) {
		comedi_driver_unregister(comedi_driver);
		return ret;
	}

	return 0;
}
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
 *
 * 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.
 */
void comedi_pci_driver_unregister(struct comedi_driver *comedi_driver,
				  struct pci_driver *pci_driver)
{
	pci_unregister_driver(pci_driver);
	comedi_driver_unregister(comedi_driver);
}
EXPORT_SYMBOL_GPL(comedi_pci_driver_unregister);