209 lines
6.6 KiB
C
209 lines
6.6 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* comedi_pcmcia.c
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* Comedi PCMCIA 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/kernel.h>
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#include <linux/comedi/comedi_pcmcia.h>
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/**
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* comedi_to_pcmcia_dev() - Return PCMCIA 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 pcmcia_device.
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*
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* Return: Attached PCMCIA 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 pcmcia_device *comedi_to_pcmcia_dev(struct comedi_device *dev)
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{
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return dev->hw_dev ? to_pcmcia_dev(dev->hw_dev) : NULL;
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}
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EXPORT_SYMBOL_GPL(comedi_to_pcmcia_dev);
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static int comedi_pcmcia_conf_check(struct pcmcia_device *link,
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void *priv_data)
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{
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if (link->config_index == 0)
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return -EINVAL;
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return pcmcia_request_io(link);
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}
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/**
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* comedi_pcmcia_enable() - Request the regions and enable the PCMCIA device
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* @dev: COMEDI device.
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* @conf_check: Optional callback to check each configuration option of the
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* PCMCIA device and request I/O regions.
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*
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* Assuming @dev->hw_dev is non-%NULL, it is assumed to be pointing to a a
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* &struct device embedded in a &struct pcmcia_device. The comedi PCMCIA
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* driver needs to set the 'config_flags' member in the &struct pcmcia_device,
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* as appropriate for that driver, before calling this function in order to
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* allow pcmcia_loop_config() to do its internal autoconfiguration.
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*
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* If @conf_check is %NULL it is set to a default function. If is
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* passed to pcmcia_loop_config() and should return %0 if the configuration
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* is valid and I/O regions requested successfully, otherwise it should return
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* a negative error value. The default function returns -%EINVAL if the
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* 'config_index' member is %0, otherwise it calls pcmcia_request_io() and
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* returns the result.
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*
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* If the above configuration check passes, pcmcia_enable_device() is called
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* to set up and activate the PCMCIA device.
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*
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* If this function returns an error, comedi_pcmcia_disable() should be called
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* to release requested resources.
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*
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* Return:
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* 0 on success,
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* -%ENODEV id @dev->hw_dev is %NULL,
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* a negative error number from pcmcia_loop_config() if it fails,
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* or a negative error number from pcmcia_enable_device() if it fails.
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*/
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int comedi_pcmcia_enable(struct comedi_device *dev,
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int (*conf_check)(struct pcmcia_device *p_dev,
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void *priv_data))
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{
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struct pcmcia_device *link = comedi_to_pcmcia_dev(dev);
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int ret;
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if (!link)
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return -ENODEV;
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if (!conf_check)
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conf_check = comedi_pcmcia_conf_check;
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ret = pcmcia_loop_config(link, conf_check, NULL);
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if (ret)
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return ret;
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return pcmcia_enable_device(link);
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}
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EXPORT_SYMBOL_GPL(comedi_pcmcia_enable);
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/**
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* comedi_pcmcia_disable() - Disable the PCMCIA device and release 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 pcmcia_device. Call
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* pcmcia_disable_device() to disable and clean up the PCMCIA device.
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*/
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void comedi_pcmcia_disable(struct comedi_device *dev)
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{
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struct pcmcia_device *link = comedi_to_pcmcia_dev(dev);
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if (link)
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pcmcia_disable_device(link);
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}
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EXPORT_SYMBOL_GPL(comedi_pcmcia_disable);
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/**
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* comedi_pcmcia_auto_config() - Configure/probe a PCMCIA COMEDI device
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* @link: PCMCIA device.
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* @driver: Registered COMEDI driver.
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*
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* Typically called from the pcmcia_driver (*probe) function. Auto-configure
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* a COMEDI device, using a pointer to the &struct device embedded in *@link
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* as the hardware device. The @driver's "auto_attach" handler may call
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* comedi_to_pcmcia_dev() on the passed in COMEDI device to recover @link.
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*
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* Return: The result of calling comedi_auto_config() (0 on success, or a
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* negative error number on failure).
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*/
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int comedi_pcmcia_auto_config(struct pcmcia_device *link,
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struct comedi_driver *driver)
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{
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return comedi_auto_config(&link->dev, driver, 0);
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}
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EXPORT_SYMBOL_GPL(comedi_pcmcia_auto_config);
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/**
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* comedi_pcmcia_auto_unconfig() - Unconfigure/remove a PCMCIA COMEDI device
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* @link: PCMCIA device.
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*
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* Typically called from the pcmcia_driver (*remove) function.
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* Auto-unconfigure a COMEDI device attached to this PCMCIA device, using a
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* pointer to the &struct device embedded in *@link as the hardware device.
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* The COMEDI driver's "detach" handler will be called during unconfiguration
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* of the 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_pcmcia_auto_unconfig(struct pcmcia_device *link)
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{
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comedi_auto_unconfig(&link->dev);
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}
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EXPORT_SYMBOL_GPL(comedi_pcmcia_auto_unconfig);
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/**
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* comedi_pcmcia_driver_register() - Register a PCMCIA COMEDI driver
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* @comedi_driver: COMEDI driver to be registered.
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* @pcmcia_driver: PCMCIA driver to be registered.
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*
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* This function is used for the module_init() of PCMCIA COMEDI driver modules
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* to register the COMEDI driver and the PCMCIA driver. Do not call it
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* directly, use the module_comedi_pcmcia_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_pcmcia_driver_register(struct comedi_driver *comedi_driver,
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struct pcmcia_driver *pcmcia_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 = pcmcia_register_driver(pcmcia_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_pcmcia_driver_register);
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/**
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* comedi_pcmcia_driver_unregister() - Unregister a PCMCIA COMEDI driver
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* @comedi_driver: COMEDI driver to be registered.
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* @pcmcia_driver: PCMCIA driver to be registered.
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*
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* This function is called from the module_exit() of PCMCIA COMEDI driver
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* modules to unregister the PCMCIA driver and the COMEDI driver. Do not call
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* it directly, use the module_comedi_pcmcia_driver() helper macro instead.
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*/
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void comedi_pcmcia_driver_unregister(struct comedi_driver *comedi_driver,
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struct pcmcia_driver *pcmcia_driver)
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{
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pcmcia_unregister_driver(pcmcia_driver);
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comedi_driver_unregister(comedi_driver);
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}
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EXPORT_SYMBOL_GPL(comedi_pcmcia_driver_unregister);
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static int __init comedi_pcmcia_init(void)
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{
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return 0;
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}
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module_init(comedi_pcmcia_init);
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static void __exit comedi_pcmcia_exit(void)
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{
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}
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module_exit(comedi_pcmcia_exit);
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MODULE_AUTHOR("https://www.comedi.org");
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MODULE_DESCRIPTION("Comedi PCMCIA interface module");
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MODULE_LICENSE("GPL");
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