das08_cs.c revision 00990e7ce0b0e596fe41d9c64d6933ea70084003
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 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 212static 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 /* Finally, report what we've done */ 239 dev_info(&link->dev, "index 0x%02x", link->config_index); 240 printk(", irq %u", link->irq); 241 if (link->resource[0]) 242 printk(", io %pR", link->resource[0]); 243 if (link->resource[1]) 244 printk(" & %pR", link->resource[1]); 245 printk("\n"); 246 247 return; 248 249failed: 250 das08_pcmcia_release(link); 251 252} /* das08_pcmcia_config */ 253 254/*====================================================================== 255 256 After a card is removed, das08_pcmcia_release() will unregister the 257 device, and release the PCMCIA configuration. If the device is 258 still open, this will be postponed until it is closed. 259 260======================================================================*/ 261 262static void das08_pcmcia_release(struct pcmcia_device *link) 263{ 264 dev_dbg(&link->dev, "das08_pcmcia_release\n"); 265 pcmcia_disable_device(link); 266} /* das08_pcmcia_release */ 267 268/*====================================================================== 269 270 The card status event handler. Mostly, this schedules other 271 stuff to run after an event is received. 272 273 When a CARD_REMOVAL event is received, we immediately set a 274 private flag to block future accesses to this device. All the 275 functions that actually access the device should check this flag 276 to make sure the card is still present. 277 278======================================================================*/ 279 280static int das08_pcmcia_suspend(struct pcmcia_device *link) 281{ 282 struct local_info_t *local = link->priv; 283 /* Mark the device as stopped, to block IO until later */ 284 local->stop = 1; 285 286 return 0; 287} /* das08_pcmcia_suspend */ 288 289static int das08_pcmcia_resume(struct pcmcia_device *link) 290{ 291 struct local_info_t *local = link->priv; 292 293 local->stop = 0; 294 return 0; 295} /* das08_pcmcia_resume */ 296 297/*====================================================================*/ 298 299static struct pcmcia_device_id das08_cs_id_table[] = { 300 PCMCIA_DEVICE_MANF_CARD(0x01c5, 0x4001), 301 PCMCIA_DEVICE_NULL 302}; 303 304MODULE_DEVICE_TABLE(pcmcia, das08_cs_id_table); 305MODULE_AUTHOR("David A. Schleef <ds@schleef.org>, " 306 "Frank Mori Hess <fmhess@users.sourceforge.net>"); 307MODULE_DESCRIPTION("Comedi driver for ComputerBoards DAS-08 PCMCIA boards"); 308MODULE_LICENSE("GPL"); 309 310struct pcmcia_driver das08_cs_driver = { 311 .probe = das08_pcmcia_attach, 312 .remove = das08_pcmcia_detach, 313 .suspend = das08_pcmcia_suspend, 314 .resume = das08_pcmcia_resume, 315 .id_table = das08_cs_id_table, 316 .owner = THIS_MODULE, 317 .drv = { 318 .name = "pcm-das08", 319 }, 320}; 321 322static int __init init_das08_pcmcia_cs(void) 323{ 324 pcmcia_register_driver(&das08_cs_driver); 325 return 0; 326} 327 328static void __exit exit_das08_pcmcia_cs(void) 329{ 330 pr_debug("das08_pcmcia_cs: unloading\n"); 331 pcmcia_unregister_driver(&das08_cs_driver); 332} 333 334static int __init das08_cs_init_module(void) 335{ 336 int ret; 337 338 ret = init_das08_pcmcia_cs(); 339 if (ret < 0) 340 return ret; 341 342 return comedi_driver_register(&driver_das08_cs); 343} 344 345static void __exit das08_cs_exit_module(void) 346{ 347 exit_das08_pcmcia_cs(); 348 comedi_driver_unregister(&driver_das08_cs); 349} 350 351module_init(das08_cs_init_module); 352module_exit(das08_cs_exit_module); 353