das08_cs.c revision 1ac71e5a35eebee60cdcf15b3980bd94498f037b 
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
117/*
118   The attach() and detach() entry points are used to create and destroy
119   "instances" of the driver, where each instance represents everything
120   needed to manage one actual PCMCIA card.
121*/
122
123static int das08_pcmcia_attach(struct pcmcia_device *);
124static void das08_pcmcia_detach(struct pcmcia_device *);
125
126/*
127   You'll also need to prototype all the functions that will actually
128   be used to talk to your device.  See 'memory_cs' for a good example
129   of a fully self-sufficient driver; the other drivers rely more or
130   less on other parts of the kernel.
131*/
132
133struct local_info_t {
134	struct pcmcia_device *link;
135	int stop;
136	struct bus_operations *bus;
137};
138
139/*======================================================================
140
141    das08_pcmcia_attach() creates an "instance" of the driver, allocating
142    local data structures for one device.  The device is registered
143    with Card Services.
144
145    The dev_link structure is initialized, but we don't actually
146    configure the card at this point -- we wait until we receive a
147    card insertion event.
148
149======================================================================*/
150
151static int das08_pcmcia_attach(struct pcmcia_device *link)
152{
153	struct local_info_t *local;
154
155	dev_dbg(&link->dev, "das08_pcmcia_attach()\n");
156
157	/* Allocate space for private device-specific data */
158	local = kzalloc(sizeof(struct local_info_t), GFP_KERNEL);
159	if (!local)
160		return -ENOMEM;
161	local->link = link;
162	link->priv = local;
163
164	cur_dev = link;
165
166	das08_pcmcia_config(link);
167
168	return 0;
169}				/* das08_pcmcia_attach */
170
171/*======================================================================
172
173    This deletes a driver "instance".  The device is de-registered
174    with Card Services.  If it has been released, all local data
175    structures are freed.  Otherwise, the structures will be freed
176    when the device is released.
177
178======================================================================*/
179
180static void das08_pcmcia_detach(struct pcmcia_device *link)
181{
182
183	dev_dbg(&link->dev, "das08_pcmcia_detach\n");
184
185	((struct local_info_t *)link->priv)->stop = 1;
186	das08_pcmcia_release(link);
187
188	/* This points to the parent struct local_info_t struct */
189	kfree(link->priv);
190
191}				/* das08_pcmcia_detach */
192
193
194static int das08_pcmcia_config_loop(struct pcmcia_device *p_dev,
195				cistpl_cftable_entry_t *cfg,
196				cistpl_cftable_entry_t *dflt,
197				unsigned int vcc,
198				void *priv_data)
199{
200	if (cfg->index == 0)
201		return -ENODEV;
202
203	/* Do we need to allocate an interrupt? */
204	p_dev->config_flags |= CONF_ENABLE_IRQ;
205
206	/* IO window settings */
207	p_dev->resource[0]->end = p_dev->resource[1]->end = 0;
208	if ((cfg->io.nwin > 0) || (dflt->io.nwin > 0)) {
209		cistpl_io_t *io = (cfg->io.nwin) ? &cfg->io : &dflt->io;
210		p_dev->io_lines = io->flags & CISTPL_IO_LINES_MASK;
211		p_dev->resource[0]->flags &= ~IO_DATA_PATH_WIDTH;
212		p_dev->resource[0]->flags |=
213			pcmcia_io_cfg_data_width(io->flags);
214		p_dev->resource[0]->start = io->win[0].base;
215		p_dev->resource[0]->end = io->win[0].len;
216		if (io->nwin > 1) {
217			p_dev->resource[1]->flags = p_dev->resource[0]->flags;
218			p_dev->resource[1]->start = io->win[1].base;
219			p_dev->resource[1]->end = io->win[1].len;
220		}
221		/* This reserves IO space but doesn't actually enable it */
222		return pcmcia_request_io(p_dev);
223	}
224	return 0;
225}
226
227
228/*======================================================================
229
230    das08_pcmcia_config() is scheduled to run after a CARD_INSERTION event
231    is received, to configure the PCMCIA socket, and to make the
232    device available to the system.
233
234======================================================================*/
235
236static void das08_pcmcia_config(struct pcmcia_device *link)
237{
238	int ret;
239
240	dev_dbg(&link->dev, "das08_pcmcia_config\n");
241
242	ret = pcmcia_loop_config(link, das08_pcmcia_config_loop, NULL);
243	if (ret) {
244		dev_warn(&link->dev, "no configuration found\n");
245		goto failed;
246	}
247
248	if (!link->irq)
249		goto failed;
250
251	/*
252	   This actually configures the PCMCIA socket -- setting up
253	   the I/O windows and the interrupt mapping, and putting the
254	   card and host interface into "Memory and IO" mode.
255	 */
256	ret = pcmcia_enable_device(link);
257	if (ret)
258		goto failed;
259
260	/* Finally, report what we've done */
261	dev_info(&link->dev, "index 0x%02x", link->config_index);
262	printk(", irq %u", link->irq);
263	if (link->resource[0])
264		printk(", io %pR", link->resource[0]);
265	if (link->resource[1])
266		printk(" & %pR", link->resource[1]);
267	printk("\n");
268
269	return;
270
271failed:
272	das08_pcmcia_release(link);
273
274}				/* das08_pcmcia_config */
275
276/*======================================================================
277
278    After a card is removed, das08_pcmcia_release() will unregister the
279    device, and release the PCMCIA configuration.  If the device is
280    still open, this will be postponed until it is closed.
281
282======================================================================*/
283
284static void das08_pcmcia_release(struct pcmcia_device *link)
285{
286	dev_dbg(&link->dev, "das08_pcmcia_release\n");
287	pcmcia_disable_device(link);
288}				/* das08_pcmcia_release */
289
290/*======================================================================
291
292    The card status event handler.  Mostly, this schedules other
293    stuff to run after an event is received.
294
295    When a CARD_REMOVAL event is received, we immediately set a
296    private flag to block future accesses to this device.  All the
297    functions that actually access the device should check this flag
298    to make sure the card is still present.
299
300======================================================================*/
301
302static int das08_pcmcia_suspend(struct pcmcia_device *link)
303{
304	struct local_info_t *local = link->priv;
305	/* Mark the device as stopped, to block IO until later */
306	local->stop = 1;
307
308	return 0;
309}				/* das08_pcmcia_suspend */
310
311static int das08_pcmcia_resume(struct pcmcia_device *link)
312{
313	struct local_info_t *local = link->priv;
314
315	local->stop = 0;
316	return 0;
317}				/* das08_pcmcia_resume */
318
319/*====================================================================*/
320
321static struct pcmcia_device_id das08_cs_id_table[] = {
322	PCMCIA_DEVICE_MANF_CARD(0x01c5, 0x4001),
323	PCMCIA_DEVICE_NULL
324};
325
326MODULE_DEVICE_TABLE(pcmcia, das08_cs_id_table);
327MODULE_AUTHOR("David A. Schleef <ds@schleef.org>, "
328	      "Frank Mori Hess <fmhess@users.sourceforge.net>");
329MODULE_DESCRIPTION("Comedi driver for ComputerBoards DAS-08 PCMCIA boards");
330MODULE_LICENSE("GPL");
331
332struct pcmcia_driver das08_cs_driver = {
333	.probe = das08_pcmcia_attach,
334	.remove = das08_pcmcia_detach,
335	.suspend = das08_pcmcia_suspend,
336	.resume = das08_pcmcia_resume,
337	.id_table = das08_cs_id_table,
338	.owner = THIS_MODULE,
339	.drv = {
340		.name = "pcm-das08",
341		},
342};
343
344static int __init init_das08_pcmcia_cs(void)
345{
346	pcmcia_register_driver(&das08_cs_driver);
347	return 0;
348}
349
350static void __exit exit_das08_pcmcia_cs(void)
351{
352	pr_debug("das08_pcmcia_cs: unloading\n");
353	pcmcia_unregister_driver(&das08_cs_driver);
354}
355
356static int __init das08_cs_init_module(void)
357{
358	int ret;
359
360	ret = init_das08_pcmcia_cs();
361	if (ret < 0)
362		return ret;
363
364	return comedi_driver_register(&driver_das08_cs);
365}
366
367static void __exit das08_cs_exit_module(void)
368{
369	exit_das08_pcmcia_cs();
370	comedi_driver_unregister(&driver_das08_cs);
371}
372
373module_init(das08_cs_init_module);
374module_exit(das08_cs_exit_module);
375