das08_cs.c revision 2202a5a7490a9de282846ea8d4a56d0249e09033 
1/*
2    comedi/drivers/das08_cs.c
3    DAS08 driver
4
5    COMEDI - Linux Control and Measurement Device Interface
6    Copyright (C) 2000 David A. Schleef <ds@schleef.org>
7    Copyright (C) 2001,2002,2003 Frank Mori Hess <fmhess@users.sourceforge.net>
8
9    This program is free software; you can redistribute it and/or modify
10    it under the terms of the GNU General Public License as published by
11    the Free Software Foundation; either version 2 of the License, or
12    (at your option) any later version.
13
14    This program is distributed in the hope that it will be useful,
15    but WITHOUT ANY WARRANTY; without even the implied warranty of
16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
17    GNU General Public License for more details.
18
19    You should have received a copy of the GNU General Public License
20    along with this program; if not, write to the Free Software
21    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
22
23*****************************************************************
24
25*/
26/*
27Driver: das08_cs
28Description: DAS-08 PCMCIA boards
29Author: Warren Jasper, ds, Frank Hess
30Devices: [ComputerBoards] PCM-DAS08 (pcm-das08)
31Status: works
32
33This is the PCMCIA-specific support split off from the
34das08 driver.
35
36Options (for pcm-das08):
37	NONE
38
39Command support does not exist, but could be added for this board.
40*/
41
42#include "../comedidev.h"
43
44#include <linux/delay.h>
45#include <linux/pci.h>
46#include <linux/slab.h>
47
48#include "das08.h"
49
50/* pcmcia includes */
51#include <pcmcia/cistpl.h>
52#include <pcmcia/ds.h>
53
54static struct pcmcia_device *cur_dev;
55
56#define thisboard ((const struct das08_board_struct *)dev->board_ptr)
57
58static int das08_cs_attach(struct comedi_device *dev,
59			   struct comedi_devconfig *it);
60
61static struct comedi_driver driver_das08_cs = {
62	.driver_name = "das08_cs",
63	.module = THIS_MODULE,
64	.attach = das08_cs_attach,
65	.detach = das08_common_detach,
66	.board_name = &das08_cs_boards[0].name,
67	.num_names = ARRAY_SIZE(das08_cs_boards),
68	.offset = sizeof(struct das08_board_struct),
69};
70
71static int das08_cs_attach(struct comedi_device *dev,
72			   struct comedi_devconfig *it)
73{
74	int ret;
75	unsigned long iobase;
76	struct pcmcia_device *link = cur_dev;	/*  XXX hack */
77
78	ret = alloc_private(dev, sizeof(struct das08_private_struct));
79	if (ret < 0)
80		return ret;
81
82	printk("comedi%d: das08_cs: ", dev->minor);
83	/*  deal with a pci board */
84
85	if (thisboard->bustype == pcmcia) {
86		if (link == NULL) {
87			printk(" no pcmcia cards found\n");
88			return -EIO;
89		}
90		iobase = link->resource[0]->start;
91	} else {
92		printk(" bug! board does not have PCMCIA bustype\n");
93		return -EINVAL;
94	}
95
96	printk("\n");
97
98	return das08_common_attach(dev, iobase);
99}
100
101/*======================================================================
102
103    The following pcmcia code for the pcm-das08 is adapted from the
104    dummy_cs.c driver of the Linux PCMCIA Card Services package.
105
106    The initial developer of the original code is David A. Hinds
107    <dahinds@users.sourceforge.net>.  Portions created by David A. Hinds
108    are Copyright (C) 1999 David A. Hinds.  All Rights Reserved.
109
110======================================================================*/
111
112static void das08_pcmcia_config(struct pcmcia_device *link);
113static void das08_pcmcia_release(struct pcmcia_device *link);
114static int das08_pcmcia_suspend(struct pcmcia_device *p_dev);
115static int das08_pcmcia_resume(struct pcmcia_device *p_dev);
116
117static int das08_pcmcia_attach(struct pcmcia_device *);
118static void das08_pcmcia_detach(struct pcmcia_device *);
119
120struct local_info_t {
121	struct pcmcia_device *link;
122	int stop;
123	struct bus_operations *bus;
124};
125
126static int das08_pcmcia_attach(struct pcmcia_device *link)
127{
128	struct local_info_t *local;
129
130	dev_dbg(&link->dev, "das08_pcmcia_attach()\n");
131
132	/* Allocate space for private device-specific data */
133	local = kzalloc(sizeof(struct local_info_t), GFP_KERNEL);
134	if (!local)
135		return -ENOMEM;
136	local->link = link;
137	link->priv = local;
138
139	cur_dev = link;
140
141	das08_pcmcia_config(link);
142
143	return 0;
144}				/* das08_pcmcia_attach */
145
146static void das08_pcmcia_detach(struct pcmcia_device *link)
147{
148
149	dev_dbg(&link->dev, "das08_pcmcia_detach\n");
150
151	((struct local_info_t *)link->priv)->stop = 1;
152	das08_pcmcia_release(link);
153
154	/* This points to the parent struct local_info_t struct */
155	kfree(link->priv);
156
157}				/* das08_pcmcia_detach */
158
159
160static int das08_pcmcia_config_loop(struct pcmcia_device *p_dev,
161				void *priv_data)
162{
163	if (p_dev->config_index == 0)
164		return -EINVAL;
165
166	return pcmcia_request_io(p_dev);
167}
168
169static void das08_pcmcia_config(struct pcmcia_device *link)
170{
171	int ret;
172
173	dev_dbg(&link->dev, "das08_pcmcia_config\n");
174
175	link->config_flags |= CONF_ENABLE_IRQ | CONF_AUTO_SET_IO;
176
177	ret = pcmcia_loop_config(link, das08_pcmcia_config_loop, NULL);
178	if (ret) {
179		dev_warn(&link->dev, "no configuration found\n");
180		goto failed;
181	}
182
183	if (!link->irq)
184		goto failed;
185
186	ret = pcmcia_enable_device(link);
187	if (ret)
188		goto failed;
189
190	return;
191
192failed:
193	das08_pcmcia_release(link);
194
195}				/* das08_pcmcia_config */
196
197static void das08_pcmcia_release(struct pcmcia_device *link)
198{
199	dev_dbg(&link->dev, "das08_pcmcia_release\n");
200	pcmcia_disable_device(link);
201}				/* das08_pcmcia_release */
202
203static int das08_pcmcia_suspend(struct pcmcia_device *link)
204{
205	struct local_info_t *local = link->priv;
206	/* Mark the device as stopped, to block IO until later */
207	local->stop = 1;
208
209	return 0;
210}				/* das08_pcmcia_suspend */
211
212static int das08_pcmcia_resume(struct pcmcia_device *link)
213{
214	struct local_info_t *local = link->priv;
215
216	local->stop = 0;
217	return 0;
218}				/* das08_pcmcia_resume */
219
220/*====================================================================*/
221
222static const struct pcmcia_device_id das08_cs_id_table[] = {
223	PCMCIA_DEVICE_MANF_CARD(0x01c5, 0x4001),
224	PCMCIA_DEVICE_NULL
225};
226
227MODULE_DEVICE_TABLE(pcmcia, das08_cs_id_table);
228MODULE_AUTHOR("David A. Schleef <ds@schleef.org>, "
229	      "Frank Mori Hess <fmhess@users.sourceforge.net>");
230MODULE_DESCRIPTION("Comedi driver for ComputerBoards DAS-08 PCMCIA boards");
231MODULE_LICENSE("GPL");
232
233struct pcmcia_driver das08_cs_driver = {
234	.probe = das08_pcmcia_attach,
235	.remove = das08_pcmcia_detach,
236	.suspend = das08_pcmcia_suspend,
237	.resume = das08_pcmcia_resume,
238	.id_table = das08_cs_id_table,
239	.owner = THIS_MODULE,
240	.name = "pcm-das08",
241};
242
243static int __init init_das08_pcmcia_cs(void)
244{
245	pcmcia_register_driver(&das08_cs_driver);
246	return 0;
247}
248
249static void __exit exit_das08_pcmcia_cs(void)
250{
251	pr_debug("das08_pcmcia_cs: unloading\n");
252	pcmcia_unregister_driver(&das08_cs_driver);
253}
254
255static int __init das08_cs_init_module(void)
256{
257	int ret;
258
259	ret = init_das08_pcmcia_cs();
260	if (ret < 0)
261		return ret;
262
263	return comedi_driver_register(&driver_das08_cs);
264}
265
266static void __exit das08_cs_exit_module(void)
267{
268	exit_das08_pcmcia_cs();
269	comedi_driver_unregister(&driver_das08_cs);
270}
271
272module_init(das08_cs_init_module);
273module_exit(das08_cs_exit_module);
274