2 comedi/drivers/das08_cs.c
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>
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.
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.
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.
23 *****************************************************************
28 Description: DAS-08 PCMCIA boards
29 Author: Warren Jasper, ds, Frank Hess
30 Devices: [ComputerBoards] PCM-DAS08 (pcm-das08)
33 This is the PCMCIA-specific support split off from the
36 Options (for pcm-das08):
39 Command support does not exist, but could be added for this board.
42 #include "../comedidev.h"
44 #include <linux/delay.h>
45 #include <linux/pci.h>
46 #include <linux/slab.h>
51 #include <pcmcia/cs.h>
52 #include <pcmcia/cistpl.h>
53 #include <pcmcia/ds.h>
55 static struct pcmcia_device *cur_dev;
57 #define thisboard ((const struct das08_board_struct *)dev->board_ptr)
59 static int das08_cs_attach(struct comedi_device *dev,
60 struct comedi_devconfig *it);
62 static struct comedi_driver driver_das08_cs = {
63 .driver_name = "das08_cs",
64 .module = THIS_MODULE,
65 .attach = das08_cs_attach,
66 .detach = das08_common_detach,
67 .board_name = &das08_cs_boards[0].name,
68 .num_names = ARRAY_SIZE(das08_cs_boards),
69 .offset = sizeof(struct das08_board_struct),
72 static int das08_cs_attach(struct comedi_device *dev,
73 struct comedi_devconfig *it)
77 struct pcmcia_device *link = cur_dev; /* XXX hack */
79 ret = alloc_private(dev, sizeof(struct das08_private_struct));
83 printk("comedi%d: das08_cs: ", dev->minor);
84 /* deal with a pci board */
86 if (thisboard->bustype == pcmcia) {
88 printk(" no pcmcia cards found\n");
91 iobase = link->resource[0]->start;
93 printk(" bug! board does not have PCMCIA bustype\n");
99 return das08_common_attach(dev, iobase);
102 /*======================================================================
104 The following pcmcia code for the pcm-das08 is adapted from the
105 dummy_cs.c driver of the Linux PCMCIA Card Services package.
107 The initial developer of the original code is David A. Hinds
108 <dahinds@users.sourceforge.net>. Portions created by David A. Hinds
109 are Copyright (C) 1999 David A. Hinds. All Rights Reserved.
111 ======================================================================*/
113 static void das08_pcmcia_config(struct pcmcia_device *link);
114 static void das08_pcmcia_release(struct pcmcia_device *link);
115 static int das08_pcmcia_suspend(struct pcmcia_device *p_dev);
116 static int das08_pcmcia_resume(struct pcmcia_device *p_dev);
119 The attach() and detach() entry points are used to create and destroy
120 "instances" of the driver, where each instance represents everything
121 needed to manage one actual PCMCIA card.
124 static int das08_pcmcia_attach(struct pcmcia_device *);
125 static void das08_pcmcia_detach(struct pcmcia_device *);
128 You'll also need to prototype all the functions that will actually
129 be used to talk to your device. See 'memory_cs' for a good example
130 of a fully self-sufficient driver; the other drivers rely more or
131 less on other parts of the kernel.
135 The dev_info variable is the "key" that is used to match up this
136 device driver with appropriate cards, through the card configuration
140 static const dev_info_t dev_info = "pcm-das08";
142 struct local_info_t {
143 struct pcmcia_device *link;
145 struct bus_operations *bus;
148 /*======================================================================
150 das08_pcmcia_attach() creates an "instance" of the driver, allocating
151 local data structures for one device. The device is registered
154 The dev_link structure is initialized, but we don't actually
155 configure the card at this point -- we wait until we receive a
156 card insertion event.
158 ======================================================================*/
160 static int das08_pcmcia_attach(struct pcmcia_device *link)
162 struct local_info_t *local;
164 dev_dbg(&link->dev, "das08_pcmcia_attach()\n");
166 /* Allocate space for private device-specific data */
167 local = kzalloc(sizeof(struct local_info_t), GFP_KERNEL);
174 General socket configuration defaults can go here. In this
175 client, we assume very little, and rely on the CIS for almost
176 everything. In most clients, many details (i.e., number, sizes,
177 and attributes of IO windows) are fixed by the nature of the
178 device, and can be hard-wired here.
180 link->conf.Attributes = 0;
181 link->conf.IntType = INT_MEMORY_AND_IO;
185 das08_pcmcia_config(link);
188 } /* das08_pcmcia_attach */
190 /*======================================================================
192 This deletes a driver "instance". The device is de-registered
193 with Card Services. If it has been released, all local data
194 structures are freed. Otherwise, the structures will be freed
195 when the device is released.
197 ======================================================================*/
199 static void das08_pcmcia_detach(struct pcmcia_device *link)
202 dev_dbg(&link->dev, "das08_pcmcia_detach\n");
204 ((struct local_info_t *)link->priv)->stop = 1;
205 das08_pcmcia_release(link);
207 /* This points to the parent struct local_info_t struct */
211 } /* das08_pcmcia_detach */
214 static int das08_pcmcia_config_loop(struct pcmcia_device *p_dev,
215 cistpl_cftable_entry_t *cfg,
216 cistpl_cftable_entry_t *dflt,
223 /* Do we need to allocate an interrupt? */
224 p_dev->conf.Attributes |= CONF_ENABLE_IRQ;
226 /* IO window settings */
227 p_dev->resource[0]->end = p_dev->resource[1]->end = 0;
228 if ((cfg->io.nwin > 0) || (dflt->io.nwin > 0)) {
229 cistpl_io_t *io = (cfg->io.nwin) ? &cfg->io : &dflt->io;
230 p_dev->io_lines = io->flags & CISTPL_IO_LINES_MASK;
231 p_dev->resource[0]->flags &= ~IO_DATA_PATH_WIDTH;
232 p_dev->resource[0]->flags |=
233 pcmcia_io_cfg_data_width(io->flags);
234 p_dev->io.IOAddrLines = io->flags & CISTPL_IO_LINES_MASK;
235 p_dev->resource[0]->start = io->win[0].base;
236 p_dev->resource[0]->end = io->win[0].len;
238 p_dev->resource[1]->flags = p_dev->resource[0]->flags;
239 p_dev->resource[1]->start = io->win[1].base;
240 p_dev->resource[1]->end = io->win[1].len;
242 /* This reserves IO space but doesn't actually enable it */
243 return pcmcia_request_io(p_dev);
249 /*======================================================================
251 das08_pcmcia_config() is scheduled to run after a CARD_INSERTION event
252 is received, to configure the PCMCIA socket, and to make the
253 device available to the system.
255 ======================================================================*/
257 static void das08_pcmcia_config(struct pcmcia_device *link)
261 dev_dbg(&link->dev, "das08_pcmcia_config\n");
263 ret = pcmcia_loop_config(link, das08_pcmcia_config_loop, NULL);
265 dev_warn(&link->dev, "no configuration found\n");
273 This actually configures the PCMCIA socket -- setting up
274 the I/O windows and the interrupt mapping, and putting the
275 card and host interface into "Memory and IO" mode.
277 ret = pcmcia_request_configuration(link, &link->conf);
281 /* Finally, report what we've done */
282 dev_info(&link->dev, "index 0x%02x", link->conf.ConfigIndex);
283 if (link->conf.Attributes & CONF_ENABLE_IRQ)
284 printk(", irq %u", link->irq);
285 if (link->resource[0])
286 printk(", io %pR", link->resource[0]);
287 if (link->resource[1])
288 printk(" & %pR", link->resource[1]);
294 das08_pcmcia_release(link);
296 } /* das08_pcmcia_config */
298 /*======================================================================
300 After a card is removed, das08_pcmcia_release() will unregister the
301 device, and release the PCMCIA configuration. If the device is
302 still open, this will be postponed until it is closed.
304 ======================================================================*/
306 static void das08_pcmcia_release(struct pcmcia_device *link)
308 dev_dbg(&link->dev, "das08_pcmcia_release\n");
309 pcmcia_disable_device(link);
310 } /* das08_pcmcia_release */
312 /*======================================================================
314 The card status event handler. Mostly, this schedules other
315 stuff to run after an event is received.
317 When a CARD_REMOVAL event is received, we immediately set a
318 private flag to block future accesses to this device. All the
319 functions that actually access the device should check this flag
320 to make sure the card is still present.
322 ======================================================================*/
324 static int das08_pcmcia_suspend(struct pcmcia_device *link)
326 struct local_info_t *local = link->priv;
327 /* Mark the device as stopped, to block IO until later */
331 } /* das08_pcmcia_suspend */
333 static int das08_pcmcia_resume(struct pcmcia_device *link)
335 struct local_info_t *local = link->priv;
339 } /* das08_pcmcia_resume */
341 /*====================================================================*/
343 static struct pcmcia_device_id das08_cs_id_table[] = {
344 PCMCIA_DEVICE_MANF_CARD(0x01c5, 0x4001),
348 MODULE_DEVICE_TABLE(pcmcia, das08_cs_id_table);
349 MODULE_AUTHOR("David A. Schleef <ds@schleef.org>, "
350 "Frank Mori Hess <fmhess@users.sourceforge.net>");
351 MODULE_DESCRIPTION("Comedi driver for ComputerBoards DAS-08 PCMCIA boards");
352 MODULE_LICENSE("GPL");
354 struct pcmcia_driver das08_cs_driver = {
355 .probe = das08_pcmcia_attach,
356 .remove = das08_pcmcia_detach,
357 .suspend = das08_pcmcia_suspend,
358 .resume = das08_pcmcia_resume,
359 .id_table = das08_cs_id_table,
360 .owner = THIS_MODULE,
366 static int __init init_das08_pcmcia_cs(void)
368 pcmcia_register_driver(&das08_cs_driver);
372 static void __exit exit_das08_pcmcia_cs(void)
374 pr_debug("das08_pcmcia_cs: unloading\n");
375 pcmcia_unregister_driver(&das08_cs_driver);
378 static int __init das08_cs_init_module(void)
382 ret = init_das08_pcmcia_cs();
386 return comedi_driver_register(&driver_das08_cs);
389 static void __exit das08_cs_exit_module(void)
391 exit_das08_pcmcia_cs();
392 comedi_driver_unregister(&driver_das08_cs);
395 module_init(das08_cs_init_module);
396 module_exit(das08_cs_exit_module);