drivers/staging/comedi/drivers/das08_cs.c

   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 /*
  27 Driver: das08_cs
  28 Description: DAS-08 PCMCIA boards
  29 Author: Warren Jasper, ds, Frank Hess
  30 Devices: [ComputerBoards] PCM-DAS08 (pcm-das08)
  31 Status: works
  32
  33 This is the PCMCIA-specific support split off from the
  34 das08 driver.
  35
  36 Options (for pcm-das08):
  37         NONE
  38
  39 Command 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
  54 static struct pcmcia_device *cur_dev;
  55
  56 #define thisboard ((const struct das08_board_struct *)dev->board_ptr)
  57
  58 static int das08_cs_attach(struct comedi_device *dev,
  59                            struct comedi_devconfig *it);
  60
  61 static 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
  71 static 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
 112 static void das08_pcmcia_config(struct pcmcia_device *link);
 113 static void das08_pcmcia_release(struct pcmcia_device *link);
 114 static int das08_pcmcia_suspend(struct pcmcia_device *p_dev);
 115 static 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
 123 static int das08_pcmcia_attach(struct pcmcia_device *);
 124 static 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
 133 struct 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
 151 static 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
 180 static 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
 194 static int das08_pcmcia_config_loop(struct pcmcia_device *p_dev,
 195                                 void *priv_data)
 196 {
 197         if (p_dev->config_index == 0)
 198                 return -EINVAL;
 199
 200         return pcmcia_request_io(p_dev);
 201 }
 202
 203
 204 /*======================================================================
 205
 206     das08_pcmcia_config() is scheduled to run after a CARD_INSERTION event
 207     is received, to configure the PCMCIA socket, and to make the
 208     device available to the system.
 209
 210 ======================================================================*/
 211
 212 static void das08_pcmcia_config(struct pcmcia_device *link)
 213 {
 214         int ret;
 215
 216         dev_dbg(&link->dev, "das08_pcmcia_config\n");
 217
 218         link->config_flags |= CONF_ENABLE_IRQ | CONF_AUTO_SET_IO;
 219
 220         ret = pcmcia_loop_config(link, das08_pcmcia_config_loop, NULL);
 221         if (ret) {
 222                 dev_warn(&link->dev, "no configuration found\n");
 223                 goto failed;
 224         }
 225
 226         if (!link->irq)
 227                 goto failed;
 228
 229         /*
 230            This actually configures the PCMCIA socket -- setting up
 231            the I/O windows and the interrupt mapping, and putting the
 232            card and host interface into "Memory and IO" mode.
 233          */
 234         ret = pcmcia_enable_device(link);
 235         if (ret)
 236                 goto failed;
 237
 238         return;
 239
 240 failed:
 241         das08_pcmcia_release(link);
 242
 243 }                               /* das08_pcmcia_config */
 244
 245 /*======================================================================
 246
 247     After a card is removed, das08_pcmcia_release() will unregister the
 248     device, and release the PCMCIA configuration.  If the device is
 249     still open, this will be postponed until it is closed.
 250
 251 ======================================================================*/
 252
 253 static void das08_pcmcia_release(struct pcmcia_device *link)
 254 {
 255         dev_dbg(&link->dev, "das08_pcmcia_release\n");
 256         pcmcia_disable_device(link);
 257 }                               /* das08_pcmcia_release */
 258
 259 /*======================================================================
 260
 261     The card status event handler.  Mostly, this schedules other
 262     stuff to run after an event is received.
 263
 264     When a CARD_REMOVAL event is received, we immediately set a
 265     private flag to block future accesses to this device.  All the
 266     functions that actually access the device should check this flag
 267     to make sure the card is still present.
 268
 269 ======================================================================*/
 270
 271 static int das08_pcmcia_suspend(struct pcmcia_device *link)
 272 {
 273         struct local_info_t *local = link->priv;
 274         /* Mark the device as stopped, to block IO until later */
 275         local->stop = 1;
 276
 277         return 0;
 278 }                               /* das08_pcmcia_suspend */
 279
 280 static int das08_pcmcia_resume(struct pcmcia_device *link)
 281 {
 282         struct local_info_t *local = link->priv;
 283
 284         local->stop = 0;
 285         return 0;
 286 }                               /* das08_pcmcia_resume */
 287
 288 /*====================================================================*/
 289
 290 static struct pcmcia_device_id das08_cs_id_table[] = {
 291         PCMCIA_DEVICE_MANF_CARD(0x01c5, 0x4001),
 292         PCMCIA_DEVICE_NULL
 293 };
 294
 295 MODULE_DEVICE_TABLE(pcmcia, das08_cs_id_table);
 296 MODULE_AUTHOR("David A. Schleef <ds@schleef.org>, "
 297               "Frank Mori Hess <fmhess@users.sourceforge.net>");
 298 MODULE_DESCRIPTION("Comedi driver for ComputerBoards DAS-08 PCMCIA boards");
 299 MODULE_LICENSE("GPL");
 300
 301 struct pcmcia_driver das08_cs_driver = {
 302         .probe = das08_pcmcia_attach,
 303         .remove = das08_pcmcia_detach,
 304         .suspend = das08_pcmcia_suspend,
 305         .resume = das08_pcmcia_resume,
 306         .id_table = das08_cs_id_table,
 307         .owner = THIS_MODULE,
 308         .name = "pcm-das08",
 309 };
 310
 311 static int __init init_das08_pcmcia_cs(void)
 312 {
 313         pcmcia_register_driver(&das08_cs_driver);
 314         return 0;
 315 }
 316
 317 static void __exit exit_das08_pcmcia_cs(void)
 318 {
 319         pr_debug("das08_pcmcia_cs: unloading\n");
 320         pcmcia_unregister_driver(&das08_cs_driver);
 321 }
 322
 323 static int __init das08_cs_init_module(void)
 324 {
 325         int ret;
 326
 327         ret = init_das08_pcmcia_cs();
 328         if (ret < 0)
 329                 return ret;
 330
 331         return comedi_driver_register(&driver_das08_cs);
 332 }
 333
 334 static void __exit das08_cs_exit_module(void)
 335 {
 336         exit_das08_pcmcia_cs();
 337         comedi_driver_unregister(&driver_das08_cs);
 338 }
 339
 340 module_init(das08_cs_init_module);
 341 module_exit(das08_cs_exit_module);