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/module.h>
20 #include <linux/kernel.h>
21
22 #include "comedi_pcmcia.h"
23
24 /**
25 * comedi_to_pcmcia_dev() - comedi_device pointer to pcmcia_device pointer.
26 * @dev: comedi_device struct
27 */
comedi_to_pcmcia_dev(struct comedi_device * dev)28 struct pcmcia_device *comedi_to_pcmcia_dev(struct comedi_device *dev)
29 {
30 return dev->hw_dev ? to_pcmcia_dev(dev->hw_dev) : NULL;
31 }
32 EXPORT_SYMBOL_GPL(comedi_to_pcmcia_dev);
33
comedi_pcmcia_conf_check(struct pcmcia_device * link,void * priv_data)34 static int comedi_pcmcia_conf_check(struct pcmcia_device *link,
35 void *priv_data)
36 {
37 if (link->config_index == 0)
38 return -EINVAL;
39
40 return pcmcia_request_io(link);
41 }
42
43 /**
44 * comedi_pcmcia_enable() - Request the regions and enable the PCMCIA device.
45 * @dev: comedi_device struct
46 * @conf_check: optional callback to check the pcmcia_device configuration
47 *
48 * The comedi PCMCIA driver needs to set the link->config_flags, as
49 * appropriate for that driver, before calling this function in order
50 * to allow pcmcia_loop_config() to do its internal autoconfiguration.
51 */
comedi_pcmcia_enable(struct comedi_device * dev,int (* conf_check)(struct pcmcia_device *,void *))52 int comedi_pcmcia_enable(struct comedi_device *dev,
53 int (*conf_check)(struct pcmcia_device *, void *))
54 {
55 struct pcmcia_device *link = comedi_to_pcmcia_dev(dev);
56 int ret;
57
58 if (!link)
59 return -ENODEV;
60
61 if (!conf_check)
62 conf_check = comedi_pcmcia_conf_check;
63
64 ret = pcmcia_loop_config(link, conf_check, NULL);
65 if (ret)
66 return ret;
67
68 return pcmcia_enable_device(link);
69 }
70 EXPORT_SYMBOL_GPL(comedi_pcmcia_enable);
71
72 /**
73 * comedi_pcmcia_disable() - Disable the PCMCIA device and release the regions.
74 * @dev: comedi_device struct
75 */
comedi_pcmcia_disable(struct comedi_device * dev)76 void comedi_pcmcia_disable(struct comedi_device *dev)
77 {
78 struct pcmcia_device *link = comedi_to_pcmcia_dev(dev);
79
80 if (link)
81 pcmcia_disable_device(link);
82 }
83 EXPORT_SYMBOL_GPL(comedi_pcmcia_disable);
84
85 /**
86 * comedi_pcmcia_auto_config() - Configure/probe a comedi PCMCIA driver.
87 * @link: pcmcia_device struct
88 * @driver: comedi_driver struct
89 *
90 * Typically called from the pcmcia_driver (*probe) function.
91 */
comedi_pcmcia_auto_config(struct pcmcia_device * link,struct comedi_driver * driver)92 int comedi_pcmcia_auto_config(struct pcmcia_device *link,
93 struct comedi_driver *driver)
94 {
95 return comedi_auto_config(&link->dev, driver, 0);
96 }
97 EXPORT_SYMBOL_GPL(comedi_pcmcia_auto_config);
98
99 /**
100 * comedi_pcmcia_auto_unconfig() - Unconfigure/remove a comedi PCMCIA driver.
101 * @link: pcmcia_device struct
102 *
103 * Typically called from the pcmcia_driver (*remove) function.
104 */
comedi_pcmcia_auto_unconfig(struct pcmcia_device * link)105 void comedi_pcmcia_auto_unconfig(struct pcmcia_device *link)
106 {
107 comedi_auto_unconfig(&link->dev);
108 }
109 EXPORT_SYMBOL_GPL(comedi_pcmcia_auto_unconfig);
110
111 /**
112 * comedi_pcmcia_driver_register() - Register a comedi PCMCIA driver.
113 * @comedi_driver: comedi_driver struct
114 * @pcmcia_driver: pcmcia_driver struct
115 *
116 * This function is used for the module_init() of comedi USB drivers.
117 * Do not call it directly, use the module_comedi_pcmcia_driver() helper
118 * macro instead.
119 */
comedi_pcmcia_driver_register(struct comedi_driver * comedi_driver,struct pcmcia_driver * pcmcia_driver)120 int comedi_pcmcia_driver_register(struct comedi_driver *comedi_driver,
121 struct pcmcia_driver *pcmcia_driver)
122 {
123 int ret;
124
125 ret = comedi_driver_register(comedi_driver);
126 if (ret < 0)
127 return ret;
128
129 ret = pcmcia_register_driver(pcmcia_driver);
130 if (ret < 0) {
131 comedi_driver_unregister(comedi_driver);
132 return ret;
133 }
134
135 return 0;
136 }
137 EXPORT_SYMBOL_GPL(comedi_pcmcia_driver_register);
138
139 /**
140 * comedi_pcmcia_driver_unregister() - Unregister a comedi PCMCIA driver.
141 * @comedi_driver: comedi_driver struct
142 * @pcmcia_driver: pcmcia_driver struct
143 *
144 * This function is used for the module_exit() of comedi PCMCIA drivers.
145 * Do not call it directly, use the module_comedi_pcmcia_driver() helper
146 * macro instead.
147 */
comedi_pcmcia_driver_unregister(struct comedi_driver * comedi_driver,struct pcmcia_driver * pcmcia_driver)148 void comedi_pcmcia_driver_unregister(struct comedi_driver *comedi_driver,
149 struct pcmcia_driver *pcmcia_driver)
150 {
151 pcmcia_unregister_driver(pcmcia_driver);
152 comedi_driver_unregister(comedi_driver);
153 }
154 EXPORT_SYMBOL_GPL(comedi_pcmcia_driver_unregister);
155
comedi_pcmcia_init(void)156 static int __init comedi_pcmcia_init(void)
157 {
158 return 0;
159 }
160 module_init(comedi_pcmcia_init);
161
comedi_pcmcia_exit(void)162 static void __exit comedi_pcmcia_exit(void)
163 {
164 }
165 module_exit(comedi_pcmcia_exit);
166
167 MODULE_AUTHOR("http://www.comedi.org");
168 MODULE_DESCRIPTION("Comedi PCMCIA interface module");
169 MODULE_LICENSE("GPL");
170