das08_cs.c revision 90abdc3b973229bae98dd96649d9f7106cc177a4
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/cs.h> 52#include <pcmcia/cistpl.h> 53#include <pcmcia/ds.h> 54 55static struct pcmcia_device *cur_dev; 56 57#define thisboard ((const struct das08_board_struct *)dev->board_ptr) 58 59static int das08_cs_attach(struct comedi_device *dev, 60 struct comedi_devconfig *it); 61 62static 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), 70}; 71 72static int das08_cs_attach(struct comedi_device *dev, 73 struct comedi_devconfig *it) 74{ 75 int ret; 76 unsigned long iobase; 77 struct pcmcia_device *link = cur_dev; /* XXX hack */ 78 79 ret = alloc_private(dev, sizeof(struct das08_private_struct)); 80 if (ret < 0) 81 return ret; 82 83 printk("comedi%d: das08_cs: ", dev->minor); 84 /* deal with a pci board */ 85 86 if (thisboard->bustype == pcmcia) { 87 if (link == NULL) { 88 printk(" no pcmcia cards found\n"); 89 return -EIO; 90 } 91 iobase = link->resource[0]->start; 92 } else { 93 printk(" bug! board does not have PCMCIA bustype\n"); 94 return -EINVAL; 95 } 96 97 printk("\n"); 98 99 return das08_common_attach(dev, iobase); 100} 101 102/*====================================================================== 103 104 The following pcmcia code for the pcm-das08 is adapted from the 105 dummy_cs.c driver of the Linux PCMCIA Card Services package. 106 107 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. 110 111======================================================================*/ 112 113static void das08_pcmcia_config(struct pcmcia_device *link); 114static void das08_pcmcia_release(struct pcmcia_device *link); 115static int das08_pcmcia_suspend(struct pcmcia_device *p_dev); 116static int das08_pcmcia_resume(struct pcmcia_device *p_dev); 117 118/* 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. 122*/ 123 124static int das08_pcmcia_attach(struct pcmcia_device *); 125static void das08_pcmcia_detach(struct pcmcia_device *); 126 127/* 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. 132*/ 133 134/* 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 137 database. 138*/ 139 140static const dev_info_t dev_info = "pcm-das08"; 141 142struct local_info_t { 143 struct pcmcia_device *link; 144 int stop; 145 struct bus_operations *bus; 146}; 147 148/*====================================================================== 149 150 das08_pcmcia_attach() creates an "instance" of the driver, allocating 151 local data structures for one device. The device is registered 152 with Card Services. 153 154 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. 157 158======================================================================*/ 159 160static int das08_pcmcia_attach(struct pcmcia_device *link) 161{ 162 struct local_info_t *local; 163 164 dev_dbg(&link->dev, "das08_pcmcia_attach()\n"); 165 166 /* Allocate space for private device-specific data */ 167 local = kzalloc(sizeof(struct local_info_t), GFP_KERNEL); 168 if (!local) 169 return -ENOMEM; 170 local->link = link; 171 link->priv = local; 172 173 /* 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. 179 */ 180 link->conf.Attributes = 0; 181 link->conf.IntType = INT_MEMORY_AND_IO; 182 183 cur_dev = link; 184 185 das08_pcmcia_config(link); 186 187 return 0; 188} /* das08_pcmcia_attach */ 189 190/*====================================================================== 191 192 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. 196 197======================================================================*/ 198 199static void das08_pcmcia_detach(struct pcmcia_device *link) 200{ 201 202 dev_dbg(&link->dev, "das08_pcmcia_detach\n"); 203 204 ((struct local_info_t *)link->priv)->stop = 1; 205 das08_pcmcia_release(link); 206 207 /* This points to the parent struct local_info_t struct */ 208 if (link->priv) 209 kfree(link->priv); 210 211} /* das08_pcmcia_detach */ 212 213 214static int das08_pcmcia_config_loop(struct pcmcia_device *p_dev, 215 cistpl_cftable_entry_t *cfg, 216 cistpl_cftable_entry_t *dflt, 217 unsigned int vcc, 218 void *priv_data) 219{ 220 if (cfg->index == 0) 221 return -ENODEV; 222 223 /* Do we need to allocate an interrupt? */ 224 p_dev->conf.Attributes |= CONF_ENABLE_IRQ; 225 226 /* 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; 237 if (io->nwin > 1) { 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; 241 } 242 /* This reserves IO space but doesn't actually enable it */ 243 return pcmcia_request_io(p_dev); 244 } 245 return 0; 246} 247 248 249/*====================================================================== 250 251 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. 254 255======================================================================*/ 256 257static void das08_pcmcia_config(struct pcmcia_device *link) 258{ 259 int ret; 260 261 dev_dbg(&link->dev, "das08_pcmcia_config\n"); 262 263 ret = pcmcia_loop_config(link, das08_pcmcia_config_loop, NULL); 264 if (ret) { 265 dev_warn(&link->dev, "no configuration found\n"); 266 goto failed; 267 } 268 269 if (!link->irq) 270 goto failed; 271 272 /* 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. 276 */ 277 ret = pcmcia_request_configuration(link, &link->conf); 278 if (ret) 279 goto failed; 280 281 /* 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]); 289 printk("\n"); 290 291 return; 292 293failed: 294 das08_pcmcia_release(link); 295 296} /* das08_pcmcia_config */ 297 298/*====================================================================== 299 300 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. 303 304======================================================================*/ 305 306static void das08_pcmcia_release(struct pcmcia_device *link) 307{ 308 dev_dbg(&link->dev, "das08_pcmcia_release\n"); 309 pcmcia_disable_device(link); 310} /* das08_pcmcia_release */ 311 312/*====================================================================== 313 314 The card status event handler. Mostly, this schedules other 315 stuff to run after an event is received. 316 317 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. 321 322======================================================================*/ 323 324static int das08_pcmcia_suspend(struct pcmcia_device *link) 325{ 326 struct local_info_t *local = link->priv; 327 /* Mark the device as stopped, to block IO until later */ 328 local->stop = 1; 329 330 return 0; 331} /* das08_pcmcia_suspend */ 332 333static int das08_pcmcia_resume(struct pcmcia_device *link) 334{ 335 struct local_info_t *local = link->priv; 336 337 local->stop = 0; 338 return 0; 339} /* das08_pcmcia_resume */ 340 341/*====================================================================*/ 342 343static struct pcmcia_device_id das08_cs_id_table[] = { 344 PCMCIA_DEVICE_MANF_CARD(0x01c5, 0x4001), 345 PCMCIA_DEVICE_NULL 346}; 347 348MODULE_DEVICE_TABLE(pcmcia, das08_cs_id_table); 349MODULE_AUTHOR("David A. Schleef <ds@schleef.org>, " 350 "Frank Mori Hess <fmhess@users.sourceforge.net>"); 351MODULE_DESCRIPTION("Comedi driver for ComputerBoards DAS-08 PCMCIA boards"); 352MODULE_LICENSE("GPL"); 353 354struct 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, 361 .drv = { 362 .name = dev_info, 363 }, 364}; 365 366static int __init init_das08_pcmcia_cs(void) 367{ 368 pcmcia_register_driver(&das08_cs_driver); 369 return 0; 370} 371 372static void __exit exit_das08_pcmcia_cs(void) 373{ 374 pr_debug("das08_pcmcia_cs: unloading\n"); 375 pcmcia_unregister_driver(&das08_cs_driver); 376} 377 378static int __init das08_cs_init_module(void) 379{ 380 int ret; 381 382 ret = init_das08_pcmcia_cs(); 383 if (ret < 0) 384 return ret; 385 386 return comedi_driver_register(&driver_das08_cs); 387} 388 389static void __exit das08_cs_exit_module(void) 390{ 391 exit_das08_pcmcia_cs(); 392 comedi_driver_unregister(&driver_das08_cs); 393} 394 395module_init(das08_cs_init_module); 396module_exit(das08_cs_exit_module); 397