[go: nahoru, domu]
1/*
2 * comedi_pcmcia.c
3 * Comedi PCMCIA driver specific functions.
4 *
5 * COMEDI - Linux Control and Measurement Device Interface
6 * Copyright (C) 1997-2000 David A. Schleef <ds@schleef.org>
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16 * GNU General Public License for more details.
17 */
18
19#include <linux/kernel.h>
20
21#include <pcmcia/cistpl.h>
22#include <pcmcia/ds.h>
23
24#include "comedidev.h"
25
26/**
27 * comedi_to_pcmcia_dev() - comedi_device pointer to pcmcia_device pointer.
28 * @dev: comedi_device struct
29 */
30struct pcmcia_device *comedi_to_pcmcia_dev(struct comedi_device *dev)
31{
32	return dev->hw_dev ? to_pcmcia_dev(dev->hw_dev) : NULL;
33}
34EXPORT_SYMBOL_GPL(comedi_to_pcmcia_dev);
35
36static int comedi_pcmcia_conf_check(struct pcmcia_device *link,
37				    void *priv_data)
38{
39	if (link->config_index == 0)
40		return -EINVAL;
41
42	return pcmcia_request_io(link);
43}
44
45/**
46 * comedi_pcmcia_enable() - Request the regions and enable the PCMCIA device.
47 * @dev: comedi_device struct
48 * @conf_check: optional callback to check the pcmcia_device configuration
49 *
50 * The comedi PCMCIA driver needs to set the link->config_flags, as
51 * appropriate for that driver, before calling this function in order
52 * to allow pcmcia_loop_config() to do its internal autoconfiguration.
53 */
54int comedi_pcmcia_enable(struct comedi_device *dev,
55			 int (*conf_check)(struct pcmcia_device *, void *))
56{
57	struct pcmcia_device *link = comedi_to_pcmcia_dev(dev);
58	int ret;
59
60	if (!link)
61		return -ENODEV;
62
63	if (!conf_check)
64		conf_check = comedi_pcmcia_conf_check;
65
66	ret = pcmcia_loop_config(link, conf_check, NULL);
67	if (ret)
68		return ret;
69
70	return pcmcia_enable_device(link);
71}
72EXPORT_SYMBOL_GPL(comedi_pcmcia_enable);
73
74/**
75 * comedi_pcmcia_disable() - Disable the PCMCIA device and release the regions.
76 * @dev: comedi_device struct
77 */
78void comedi_pcmcia_disable(struct comedi_device *dev)
79{
80	struct pcmcia_device *link = comedi_to_pcmcia_dev(dev);
81
82	if (link)
83		pcmcia_disable_device(link);
84}
85EXPORT_SYMBOL_GPL(comedi_pcmcia_disable);
86
87/**
88 * comedi_pcmcia_auto_config() - Configure/probe a comedi PCMCIA driver.
89 * @link: pcmcia_device struct
90 * @driver: comedi_driver struct
91 *
92 * Typically called from the pcmcia_driver (*probe) function.
93 */
94int comedi_pcmcia_auto_config(struct pcmcia_device *link,
95			      struct comedi_driver *driver)
96{
97	return comedi_auto_config(&link->dev, driver, 0);
98}
99EXPORT_SYMBOL_GPL(comedi_pcmcia_auto_config);
100
101/**
102 * comedi_pcmcia_auto_unconfig() - Unconfigure/remove a comedi PCMCIA driver.
103 * @link: pcmcia_device struct
104 *
105 * Typically called from the pcmcia_driver (*remove) function.
106 */
107void comedi_pcmcia_auto_unconfig(struct pcmcia_device *link)
108{
109	comedi_auto_unconfig(&link->dev);
110}
111EXPORT_SYMBOL_GPL(comedi_pcmcia_auto_unconfig);
112
113/**
114 * comedi_pcmcia_driver_register() - Register a comedi PCMCIA driver.
115 * @comedi_driver: comedi_driver struct
116 * @pcmcia_driver: pcmcia_driver struct
117 *
118 * This function is used for the module_init() of comedi USB drivers.
119 * Do not call it directly, use the module_comedi_pcmcia_driver() helper
120 * macro instead.
121 */
122int comedi_pcmcia_driver_register(struct comedi_driver *comedi_driver,
123				  struct pcmcia_driver *pcmcia_driver)
124{
125	int ret;
126
127	ret = comedi_driver_register(comedi_driver);
128	if (ret < 0)
129		return ret;
130
131	ret = pcmcia_register_driver(pcmcia_driver);
132	if (ret < 0) {
133		comedi_driver_unregister(comedi_driver);
134		return ret;
135	}
136
137	return 0;
138}
139EXPORT_SYMBOL_GPL(comedi_pcmcia_driver_register);
140
141/**
142 * comedi_pcmcia_driver_unregister() - Unregister a comedi PCMCIA driver.
143 * @comedi_driver: comedi_driver struct
144 * @pcmcia_driver: pcmcia_driver struct
145 *
146 * This function is used for the module_exit() of comedi PCMCIA drivers.
147 * Do not call it directly, use the module_comedi_pcmcia_driver() helper
148 * macro instead.
149 */
150void comedi_pcmcia_driver_unregister(struct comedi_driver *comedi_driver,
151				     struct pcmcia_driver *pcmcia_driver)
152{
153	pcmcia_unregister_driver(pcmcia_driver);
154	comedi_driver_unregister(comedi_driver);
155}
156EXPORT_SYMBOL_GPL(comedi_pcmcia_driver_unregister);
157