| /* |
| * comedi_pcmcia.c |
| * Comedi PCMCIA 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/kernel.h> |
| |
| #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 *, void *)) |
| { |
| 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("http://www.comedi.org"); |
| MODULE_DESCRIPTION("Comedi PCMCIA interface module"); |
| MODULE_LICENSE("GPL"); |