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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