// SPDX-License-Identifier: GPL-2.0+ /* * comedi_pcmcia.c * Comedi PCMCIA driver specific functions. * * COMEDI - Linux Control and Measurement Device Interface * Copyright (C) 1997-2000 David A. Schleef */ #include #include #include "comedi_pcmcia.h" /** * comedi_to_pcmcia_dev() - Return PCMCIA 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 pcmcia_device. * * Return: Attached PCMCIA device if @dev->hw_dev is non-%NULL. * Return %NULL if @dev->hw_dev is %NULL. */ struct pcmcia_device *comedi_to_pcmcia_dev(struct comedi_device *dev) { return dev->hw_dev ? to_pcmcia_dev(dev->hw_dev) : NULL; } EXPORT_SYMBOL_GPL(comedi_to_pcmcia_dev); static int comedi_pcmcia_conf_check(struct pcmcia_device *link, void *priv_data) { if (link->config_index == 0) return -EINVAL; return pcmcia_request_io(link); } /** * comedi_pcmcia_enable() - Request the regions and enable the PCMCIA device * @dev: COMEDI device. * @conf_check: Optional callback to check each configuration option of the * PCMCIA device and request I/O regions. * * Assuming @dev->hw_dev is non-%NULL, it is assumed to be pointing to a a * &struct device embedded in a &struct pcmcia_device. The comedi PCMCIA * driver needs to set the 'config_flags' member in the &struct pcmcia_device, * as appropriate for that driver, before calling this function in order to * allow pcmcia_loop_config() to do its internal autoconfiguration. * * If @conf_check is %NULL it is set to a default function. If is * passed to pcmcia_loop_config() and should return %0 if the configuration * is valid and I/O regions requested successfully, otherwise it should return * a negative error value. The default function returns -%EINVAL if the * 'config_index' member is %0, otherwise it calls pcmcia_request_io() and * returns the result. * * If the above configuration check passes, pcmcia_enable_device() is called * to set up and activate the PCMCIA device. * * If this function returns an error, comedi_pcmcia_disable() should be called * to release requested resources. * * Return: * 0 on success, * -%ENODEV id @dev->hw_dev is %NULL, * a negative error number from pcmcia_loop_config() if it fails, * or a negative error number from pcmcia_enable_device() if it fails. */ int comedi_pcmcia_enable(struct comedi_device *dev, int (*conf_check)(struct pcmcia_device *p_dev, void *priv_data)) { struct pcmcia_device *link = comedi_to_pcmcia_dev(dev); int ret; if (!link) return -ENODEV; if (!conf_check) conf_check = comedi_pcmcia_conf_check; ret = pcmcia_loop_config(link, conf_check, NULL); if (ret) return ret; return pcmcia_enable_device(link); } EXPORT_SYMBOL_GPL(comedi_pcmcia_enable); /** * comedi_pcmcia_disable() - Disable the PCMCIA device and release 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 pcmcia_device. Call * pcmcia_disable_device() to disable and clean up the PCMCIA device. */ void comedi_pcmcia_disable(struct comedi_device *dev) { struct pcmcia_device *link = comedi_to_pcmcia_dev(dev); if (link) pcmcia_disable_device(link); } EXPORT_SYMBOL_GPL(comedi_pcmcia_disable); /** * comedi_pcmcia_auto_config() - Configure/probe a PCMCIA COMEDI device * @link: PCMCIA device. * @driver: Registered COMEDI driver. * * Typically called from the pcmcia_driver (*probe) function. Auto-configure * a COMEDI device, using a pointer to the &struct device embedded in *@link * as the hardware device. The @driver's "auto_attach" handler may call * comedi_to_pcmcia_dev() on the passed in COMEDI device to recover @link. * * Return: The result of calling comedi_auto_config() (0 on success, or a * negative error number on failure). */ int comedi_pcmcia_auto_config(struct pcmcia_device *link, struct comedi_driver *driver) { return comedi_auto_config(&link->dev, driver, 0); } EXPORT_SYMBOL_GPL(comedi_pcmcia_auto_config); /** * comedi_pcmcia_auto_unconfig() - Unconfigure/remove a PCMCIA COMEDI device * @link: PCMCIA device. * * Typically called from the pcmcia_driver (*remove) function. * Auto-unconfigure a COMEDI device attached to this PCMCIA device, using a * pointer to the &struct device embedded in *@link 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_pcmcia_auto_unconfig(struct pcmcia_device *link) { comedi_auto_unconfig(&link->dev); } EXPORT_SYMBOL_GPL(comedi_pcmcia_auto_unconfig); /** * comedi_pcmcia_driver_register() - Register a PCMCIA COMEDI driver * @comedi_driver: COMEDI driver to be registered. * @pcmcia_driver: PCMCIA driver to be registered. * * This function is used for the module_init() of PCMCIA COMEDI driver modules * to register the COMEDI driver and the PCMCIA driver. Do not call it * directly, use the module_comedi_pcmcia_driver() helper macro instead. * * Return: 0 on success, or a negative error number on failure. */ int comedi_pcmcia_driver_register(struct comedi_driver *comedi_driver, struct pcmcia_driver *pcmcia_driver) { int ret; ret = comedi_driver_register(comedi_driver); if (ret < 0) return ret; ret = pcmcia_register_driver(pcmcia_driver); if (ret < 0) { comedi_driver_unregister(comedi_driver); return ret; } return 0; } EXPORT_SYMBOL_GPL(comedi_pcmcia_driver_register); /** * comedi_pcmcia_driver_unregister() - Unregister a PCMCIA COMEDI driver * @comedi_driver: COMEDI driver to be registered. * @pcmcia_driver: PCMCIA driver to be registered. * * This function is called from the module_exit() of PCMCIA COMEDI driver * modules to unregister the PCMCIA driver and the COMEDI driver. Do not call * it directly, use the module_comedi_pcmcia_driver() helper macro instead. */ void comedi_pcmcia_driver_unregister(struct comedi_driver *comedi_driver, struct pcmcia_driver *pcmcia_driver) { pcmcia_unregister_driver(pcmcia_driver); comedi_driver_unregister(comedi_driver); } EXPORT_SYMBOL_GPL(comedi_pcmcia_driver_unregister); static int __init comedi_pcmcia_init(void) { return 0; } module_init(comedi_pcmcia_init); static void __exit comedi_pcmcia_exit(void) { } module_exit(comedi_pcmcia_exit); MODULE_AUTHOR("https://www.comedi.org"); MODULE_DESCRIPTION("Comedi PCMCIA interface module"); MODULE_LICENSE("GPL");