das08_cs.c revision d539047c7bb3d462b4b505accbb3cc31dce87801
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 47#include "das08.h" 48 49/* pcmcia includes */ 50#include <pcmcia/cs_types.h> 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->io.BasePort1; 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 dev_node_t node; 145 int stop; 146 struct bus_operations *bus; 147}; 148 149/*====================================================================== 150 151 das08_pcmcia_attach() creates an "instance" of the driver, allocating 152 local data structures for one device. The device is registered 153 with Card Services. 154 155 The dev_link structure is initialized, but we don't actually 156 configure the card at this point -- we wait until we receive a 157 card insertion event. 158 159======================================================================*/ 160 161static int das08_pcmcia_attach(struct pcmcia_device *link) 162{ 163 struct local_info_t *local; 164 165 dev_dbg(&link->dev, "das08_pcmcia_attach()\n"); 166 167 /* Allocate space for private device-specific data */ 168 local = kzalloc(sizeof(struct local_info_t), GFP_KERNEL); 169 if (!local) 170 return -ENOMEM; 171 local->link = link; 172 link->priv = local; 173 174 /* Interrupt setup */ 175 link->irq.Attributes = IRQ_TYPE_EXCLUSIVE; 176 link->irq.Handler = NULL; 177 178 /* 179 General socket configuration defaults can go here. In this 180 client, we assume very little, and rely on the CIS for almost 181 everything. In most clients, many details (i.e., number, sizes, 182 and attributes of IO windows) are fixed by the nature of the 183 device, and can be hard-wired here. 184 */ 185 link->conf.Attributes = 0; 186 link->conf.IntType = INT_MEMORY_AND_IO; 187 188 cur_dev = link; 189 190 das08_pcmcia_config(link); 191 192 return 0; 193} /* das08_pcmcia_attach */ 194 195/*====================================================================== 196 197 This deletes a driver "instance". The device is de-registered 198 with Card Services. If it has been released, all local data 199 structures are freed. Otherwise, the structures will be freed 200 when the device is released. 201 202======================================================================*/ 203 204static void das08_pcmcia_detach(struct pcmcia_device *link) 205{ 206 207 dev_dbg(&link->dev, "das08_pcmcia_detach\n"); 208 209 if (link->dev_node) { 210 ((struct local_info_t *)link->priv)->stop = 1; 211 das08_pcmcia_release(link); 212 } 213 214 /* This points to the parent struct local_info_t struct */ 215 if (link->priv) 216 kfree(link->priv); 217 218} /* das08_pcmcia_detach */ 219 220 221static int das08_pcmcia_config_loop(struct pcmcia_device *p_dev, 222 cistpl_cftable_entry_t *cfg, 223 cistpl_cftable_entry_t *dflt, 224 unsigned int vcc, 225 void *priv_data) 226{ 227 if (cfg->index == 0) 228 return -ENODEV; 229 230 /* Do we need to allocate an interrupt? */ 231 if (cfg->irq.IRQInfo1 || dflt->irq.IRQInfo1) 232 p_dev->conf.Attributes |= CONF_ENABLE_IRQ; 233 234 /* IO window settings */ 235 p_dev->io.NumPorts1 = p_dev->io.NumPorts2 = 0; 236 if ((cfg->io.nwin > 0) || (dflt->io.nwin > 0)) { 237 cistpl_io_t *io = (cfg->io.nwin) ? &cfg->io : &dflt->io; 238 p_dev->io.Attributes1 = IO_DATA_PATH_WIDTH_AUTO; 239 if (!(io->flags & CISTPL_IO_8BIT)) 240 p_dev->io.Attributes1 = IO_DATA_PATH_WIDTH_16; 241 if (!(io->flags & CISTPL_IO_16BIT)) 242 p_dev->io.Attributes1 = IO_DATA_PATH_WIDTH_8; 243 p_dev->io.IOAddrLines = io->flags & CISTPL_IO_LINES_MASK; 244 p_dev->io.BasePort1 = io->win[0].base; 245 p_dev->io.NumPorts1 = io->win[0].len; 246 if (io->nwin > 1) { 247 p_dev->io.Attributes2 = p_dev->io.Attributes1; 248 p_dev->io.BasePort2 = io->win[1].base; 249 p_dev->io.NumPorts2 = io->win[1].len; 250 } 251 /* This reserves IO space but doesn't actually enable it */ 252 return pcmcia_request_io(p_dev, &p_dev->io); 253 } 254 return 0; 255} 256 257 258/*====================================================================== 259 260 das08_pcmcia_config() is scheduled to run after a CARD_INSERTION event 261 is received, to configure the PCMCIA socket, and to make the 262 device available to the system. 263 264======================================================================*/ 265 266static void das08_pcmcia_config(struct pcmcia_device *link) 267{ 268 struct local_info_t *dev = link->priv; 269 int ret; 270 271 dev_dbg(&link->dev, "das08_pcmcia_config\n"); 272 273 ret = pcmcia_loop_config(link, das08_pcmcia_config_loop, NULL); 274 if (ret) { 275 dev_warn(&link->dev, "no configuration found\n"); 276 goto failed; 277 } 278 279 if (link->conf.Attributes & CONF_ENABLE_IRQ) { 280 ret = pcmcia_request_irq(link, &link->irq); 281 if (ret) 282 goto failed; 283 } 284 285 /* 286 This actually configures the PCMCIA socket -- setting up 287 the I/O windows and the interrupt mapping, and putting the 288 card and host interface into "Memory and IO" mode. 289 */ 290 ret = pcmcia_request_configuration(link, &link->conf); 291 if (ret) 292 goto failed; 293 294 /* 295 At this point, the dev_node_t structure(s) need to be 296 initialized and arranged in a linked list at link->dev. 297 */ 298 sprintf(dev->node.dev_name, "pcm-das08"); 299 dev->node.major = dev->node.minor = 0; 300 link->dev_node = &dev->node; 301 302 /* Finally, report what we've done */ 303 printk(KERN_INFO "%s: index 0x%02x", 304 dev->node.dev_name, link->conf.ConfigIndex); 305 if (link->conf.Attributes & CONF_ENABLE_IRQ) 306 printk(", irq %u", link->irq.AssignedIRQ); 307 if (link->io.NumPorts1) 308 printk(", io 0x%04x-0x%04x", link->io.BasePort1, 309 link->io.BasePort1 + link->io.NumPorts1 - 1); 310 if (link->io.NumPorts2) 311 printk(" & 0x%04x-0x%04x", link->io.BasePort2, 312 link->io.BasePort2 + link->io.NumPorts2 - 1); 313 printk("\n"); 314 315 return; 316 317failed: 318 das08_pcmcia_release(link); 319 320} /* das08_pcmcia_config */ 321 322/*====================================================================== 323 324 After a card is removed, das08_pcmcia_release() will unregister the 325 device, and release the PCMCIA configuration. If the device is 326 still open, this will be postponed until it is closed. 327 328======================================================================*/ 329 330static void das08_pcmcia_release(struct pcmcia_device *link) 331{ 332 dev_dbg(&link->dev, "das08_pcmcia_release\n"); 333 pcmcia_disable_device(link); 334} /* das08_pcmcia_release */ 335 336/*====================================================================== 337 338 The card status event handler. Mostly, this schedules other 339 stuff to run after an event is received. 340 341 When a CARD_REMOVAL event is received, we immediately set a 342 private flag to block future accesses to this device. All the 343 functions that actually access the device should check this flag 344 to make sure the card is still present. 345 346======================================================================*/ 347 348static int das08_pcmcia_suspend(struct pcmcia_device *link) 349{ 350 struct local_info_t *local = link->priv; 351 /* Mark the device as stopped, to block IO until later */ 352 local->stop = 1; 353 354 return 0; 355} /* das08_pcmcia_suspend */ 356 357static int das08_pcmcia_resume(struct pcmcia_device *link) 358{ 359 struct local_info_t *local = link->priv; 360 361 local->stop = 0; 362 return 0; 363} /* das08_pcmcia_resume */ 364 365/*====================================================================*/ 366 367static struct pcmcia_device_id das08_cs_id_table[] = { 368 PCMCIA_DEVICE_MANF_CARD(0x01c5, 0x4001), 369 PCMCIA_DEVICE_NULL 370}; 371 372MODULE_DEVICE_TABLE(pcmcia, das08_cs_id_table); 373 374struct pcmcia_driver das08_cs_driver = { 375 .probe = das08_pcmcia_attach, 376 .remove = das08_pcmcia_detach, 377 .suspend = das08_pcmcia_suspend, 378 .resume = das08_pcmcia_resume, 379 .id_table = das08_cs_id_table, 380 .owner = THIS_MODULE, 381 .drv = { 382 .name = dev_info, 383 }, 384}; 385 386static int __init init_das08_pcmcia_cs(void) 387{ 388 pcmcia_register_driver(&das08_cs_driver); 389 return 0; 390} 391 392static void __exit exit_das08_pcmcia_cs(void) 393{ 394 pr_debug("das08_pcmcia_cs: unloading\n"); 395 pcmcia_unregister_driver(&das08_cs_driver); 396} 397 398static int __init das08_cs_init_module(void) 399{ 400 int ret; 401 402 ret = init_das08_pcmcia_cs(); 403 if (ret < 0) 404 return ret; 405 406 return comedi_driver_register(&driver_das08_cs); 407} 408 409static void __exit das08_cs_exit_module(void) 410{ 411 exit_das08_pcmcia_cs(); 412 comedi_driver_unregister(&driver_das08_cs); 413} 414 415MODULE_LICENSE("GPL"); 416module_init(das08_cs_init_module); 417module_exit(das08_cs_exit_module); 418