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 */
comedi_to_pcmcia_dev(struct comedi_device * dev)30 struct pcmcia_device *comedi_to_pcmcia_dev(struct comedi_device *dev)
31 {
32 return dev->hw_dev ? to_pcmcia_dev(dev->hw_dev) : NULL;
33 }
34 EXPORT_SYMBOL_GPL(comedi_to_pcmcia_dev);
35
comedi_pcmcia_conf_check(struct pcmcia_device * link,void * priv_data)36 static 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 */
comedi_pcmcia_enable(struct comedi_device * dev,int (* conf_check)(struct pcmcia_device *,void *))54 int 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 }
72 EXPORT_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 */
comedi_pcmcia_disable(struct comedi_device * dev)78 void 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 }
85 EXPORT_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 */
comedi_pcmcia_auto_config(struct pcmcia_device * link,struct comedi_driver * driver)94 int comedi_pcmcia_auto_config(struct pcmcia_device *link,
95 struct comedi_driver *driver)
96 {
97 return comedi_auto_config(&link->dev, driver, 0);
98 }
99 EXPORT_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 */
comedi_pcmcia_auto_unconfig(struct pcmcia_device * link)107 void comedi_pcmcia_auto_unconfig(struct pcmcia_device *link)
108 {
109 comedi_auto_unconfig(&link->dev);
110 }
111 EXPORT_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 */
comedi_pcmcia_driver_register(struct comedi_driver * comedi_driver,struct pcmcia_driver * pcmcia_driver)122 int 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 }
139 EXPORT_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 */
comedi_pcmcia_driver_unregister(struct comedi_driver * comedi_driver,struct pcmcia_driver * pcmcia_driver)150 void 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 }
156 EXPORT_SYMBOL_GPL(comedi_pcmcia_driver_unregister);
157