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227 lines
6.7 KiB
227 lines
6.7 KiB
// 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 <[email protected]> |
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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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