228 lines
6.7 KiB
C
228 lines
6.7 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* comedi_pci.c
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* Comedi PCI driver specific functions.
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*
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* COMEDI - Linux Control and Measurement Device Interface
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* Copyright (C) 1997-2000 David A. Schleef <ds@schleef.org>
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*/
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#include <linux/module.h>
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#include <linux/interrupt.h>
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#include <linux/comedi/comedi_pci.h>
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/**
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* comedi_to_pci_dev() - Return PCI device attached to COMEDI device
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* @dev: COMEDI device.
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*
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* Assuming @dev->hw_dev is non-%NULL, it is assumed to be pointing to a
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* a &struct device embedded in a &struct pci_dev.
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*
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* Return: Attached PCI device if @dev->hw_dev is non-%NULL.
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* Return %NULL if @dev->hw_dev is %NULL.
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*/
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struct pci_dev *comedi_to_pci_dev(struct comedi_device *dev)
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{
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return dev->hw_dev ? to_pci_dev(dev->hw_dev) : NULL;
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}
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EXPORT_SYMBOL_GPL(comedi_to_pci_dev);
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/**
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* comedi_pci_enable() - Enable the PCI device and request the regions
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* @dev: COMEDI device.
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*
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* Assuming @dev->hw_dev is non-%NULL, it is assumed to be pointing to a
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* a &struct device embedded in a &struct pci_dev. Enable the PCI device
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* and request its regions. Set @dev->ioenabled to %true if successful,
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* otherwise undo what was done.
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*
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* Calls to comedi_pci_enable() and comedi_pci_disable() cannot be nested.
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*
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* Return:
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* 0 on success,
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* -%ENODEV if @dev->hw_dev is %NULL,
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* -%EBUSY if regions busy,
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* or some negative error number if failed to enable PCI device.
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*
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*/
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int comedi_pci_enable(struct comedi_device *dev)
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{
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struct pci_dev *pcidev = comedi_to_pci_dev(dev);
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int rc;
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if (!pcidev)
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return -ENODEV;
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rc = pci_enable_device(pcidev);
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if (rc < 0)
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return rc;
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rc = pci_request_regions(pcidev, dev->board_name);
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if (rc < 0)
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pci_disable_device(pcidev);
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else
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dev->ioenabled = true;
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return rc;
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}
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EXPORT_SYMBOL_GPL(comedi_pci_enable);
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/**
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* comedi_pci_disable() - Release the regions and disable the PCI device
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* @dev: COMEDI device.
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*
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* Assuming @dev->hw_dev is non-%NULL, it is assumed to be pointing to a
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* a &struct device embedded in a &struct pci_dev. If the earlier call
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* to comedi_pci_enable() was successful, release the PCI device's regions
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* and disable it. Reset @dev->ioenabled back to %false.
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*/
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void comedi_pci_disable(struct comedi_device *dev)
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{
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struct pci_dev *pcidev = comedi_to_pci_dev(dev);
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if (pcidev && dev->ioenabled) {
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pci_release_regions(pcidev);
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pci_disable_device(pcidev);
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}
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dev->ioenabled = false;
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}
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EXPORT_SYMBOL_GPL(comedi_pci_disable);
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/**
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* comedi_pci_detach() - A generic "detach" handler for PCI COMEDI drivers
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* @dev: COMEDI device.
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*
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* COMEDI drivers for PCI devices that need no special clean-up of private data
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* and have no ioremapped regions other than that pointed to by @dev->mmio may
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* use this function as its "detach" handler called by the COMEDI core when a
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* COMEDI device is being detached from the low-level driver. It may be also
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* called from a more specific "detach" handler that does additional clean-up.
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*
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* Free the IRQ if @dev->irq is non-zero, iounmap @dev->mmio if it is
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* non-%NULL, and call comedi_pci_disable() to release the PCI device's regions
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* and disable it.
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*/
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void comedi_pci_detach(struct comedi_device *dev)
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{
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struct pci_dev *pcidev = comedi_to_pci_dev(dev);
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if (!pcidev || !dev->ioenabled)
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return;
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if (dev->irq) {
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free_irq(dev->irq, dev);
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dev->irq = 0;
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}
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if (dev->mmio) {
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iounmap(dev->mmio);
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dev->mmio = NULL;
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}
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comedi_pci_disable(dev);
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}
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EXPORT_SYMBOL_GPL(comedi_pci_detach);
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/**
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* comedi_pci_auto_config() - Configure/probe a PCI COMEDI device
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* @pcidev: PCI device.
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* @driver: Registered COMEDI driver.
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* @context: Driver specific data, passed to comedi_auto_config().
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*
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* Typically called from the pci_driver (*probe) function. Auto-configure
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* a COMEDI device, using the &struct device embedded in *@pcidev as the
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* hardware device. The @context value gets passed through to @driver's
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* "auto_attach" handler. The "auto_attach" handler may call
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* comedi_to_pci_dev() on the passed in COMEDI device to recover @pcidev.
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*
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* Return: The result of calling comedi_auto_config() (0 on success, or
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* a negative error number on failure).
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*/
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int comedi_pci_auto_config(struct pci_dev *pcidev,
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struct comedi_driver *driver,
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unsigned long context)
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{
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return comedi_auto_config(&pcidev->dev, driver, context);
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}
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EXPORT_SYMBOL_GPL(comedi_pci_auto_config);
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/**
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* comedi_pci_auto_unconfig() - Unconfigure/remove a PCI COMEDI device
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* @pcidev: PCI device.
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*
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* Typically called from the pci_driver (*remove) function. Auto-unconfigure
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* a COMEDI device attached to this PCI device, using a pointer to the
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* &struct device embedded in *@pcidev as the hardware device. The COMEDI
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* driver's "detach" handler will be called during unconfiguration of the
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* COMEDI device.
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*
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* Note that the COMEDI device may have already been unconfigured using the
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* %COMEDI_DEVCONFIG ioctl, in which case this attempt to unconfigure it
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* again should be ignored.
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*/
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void comedi_pci_auto_unconfig(struct pci_dev *pcidev)
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{
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comedi_auto_unconfig(&pcidev->dev);
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}
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EXPORT_SYMBOL_GPL(comedi_pci_auto_unconfig);
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/**
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* comedi_pci_driver_register() - Register a PCI COMEDI driver
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* @comedi_driver: COMEDI driver to be registered.
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* @pci_driver: PCI driver to be registered.
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*
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* This function is called from the module_init() of PCI COMEDI driver modules
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* to register the COMEDI driver and the PCI driver. Do not call it directly,
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* use the module_comedi_pci_driver() helper macro instead.
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*
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* Return: 0 on success, or a negative error number on failure.
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*/
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int comedi_pci_driver_register(struct comedi_driver *comedi_driver,
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struct pci_driver *pci_driver)
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{
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int ret;
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ret = comedi_driver_register(comedi_driver);
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if (ret < 0)
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return ret;
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ret = pci_register_driver(pci_driver);
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if (ret < 0) {
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comedi_driver_unregister(comedi_driver);
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return ret;
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}
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return 0;
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}
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EXPORT_SYMBOL_GPL(comedi_pci_driver_register);
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/**
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* comedi_pci_driver_unregister() - Unregister a PCI COMEDI driver
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* @comedi_driver: COMEDI driver to be unregistered.
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* @pci_driver: PCI driver to be unregistered.
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*
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* This function is called from the module_exit() of PCI COMEDI driver modules
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* to unregister the PCI driver and the COMEDI driver. Do not call it
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* directly, use the module_comedi_pci_driver() helper macro instead.
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*/
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void comedi_pci_driver_unregister(struct comedi_driver *comedi_driver,
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struct pci_driver *pci_driver)
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{
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pci_unregister_driver(pci_driver);
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comedi_driver_unregister(comedi_driver);
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}
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EXPORT_SYMBOL_GPL(comedi_pci_driver_unregister);
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static int __init comedi_pci_init(void)
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{
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return 0;
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}
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module_init(comedi_pci_init);
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static void __exit comedi_pci_exit(void)
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{
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}
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module_exit(comedi_pci_exit);
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MODULE_AUTHOR("https://www.comedi.org");
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MODULE_DESCRIPTION("Comedi PCI interface module");
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MODULE_LICENSE("GPL");
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