| /* |
| * 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/module.h> |
| #include <linux/interrupt.h> |
| |
| #include "comedi_pci.h" |
| |
| /** |
| * 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. |
| * |
| * Return: Attached PCI device if @dev->hw_dev is non-%NULL. |
| * Return %NULL if @dev->hw_dev is %NULL. |
| */ |
| 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. |
| * |
| * 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. |
| * |
| * Return: |
| * 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) |
| { |
| 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. |
| * |
| * 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) |
| { |
| 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_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) |
| { |
| struct pci_dev *pcidev = comedi_to_pci_dev(dev); |
| |
| if (!pcidev || !dev->ioenabled) |
| return; |
| |
| if (dev->irq) { |
| free_irq(dev->irq, dev); |
| dev->irq = 0; |
| } |
| if (dev->mmio) { |
| iounmap(dev->mmio); |
| dev->mmio = NULL; |
| } |
| comedi_pci_disable(dev); |
| } |
| EXPORT_SYMBOL_GPL(comedi_pci_detach); |
| |
| /** |
| * 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. 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. |
| * |
| * Return: 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, |
| 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 PCI COMEDI device |
| * @pcidev: PCI device. |
| * |
| * 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) |
| { |
| comedi_auto_unconfig(&pcidev->dev); |
| } |
| EXPORT_SYMBOL_GPL(comedi_pci_auto_unconfig); |
| |
| /** |
| * 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 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. |
| * |
| * Return: 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) |
| { |
| 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 PCI COMEDI driver |
| * @comedi_driver: COMEDI driver to be unregistered. |
| * @pci_driver: PCI driver to be unregistered. |
| * |
| * 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) |
| { |
| pci_unregister_driver(pci_driver); |
| comedi_driver_unregister(comedi_driver); |
| } |
| EXPORT_SYMBOL_GPL(comedi_pci_driver_unregister); |
| |
| static int __init comedi_pci_init(void) |
| { |
| return 0; |
| } |
| module_init(comedi_pci_init); |
| |
| static void __exit comedi_pci_exit(void) |
| { |
| } |
| module_exit(comedi_pci_exit); |
| |
| MODULE_AUTHOR("http://www.comedi.org"); |
| MODULE_DESCRIPTION("Comedi PCI interface module"); |
| MODULE_LICENSE("GPL"); |