das08_cs.c revision 2e9b981a7c63ee8278df6823f8389d69dad1a499
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 return; 239 240failed: 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 253static 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 271static 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 280static 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 290static struct pcmcia_device_id das08_cs_id_table[] = { 291 PCMCIA_DEVICE_MANF_CARD(0x01c5, 0x4001), 292 PCMCIA_DEVICE_NULL 293}; 294 295MODULE_DEVICE_TABLE(pcmcia, das08_cs_id_table); 296MODULE_AUTHOR("David A. Schleef <ds@schleef.org>, " 297 "Frank Mori Hess <fmhess@users.sourceforge.net>"); 298MODULE_DESCRIPTION("Comedi driver for ComputerBoards DAS-08 PCMCIA boards"); 299MODULE_LICENSE("GPL"); 300 301struct 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 311static int __init init_das08_pcmcia_cs(void) 312{ 313 pcmcia_register_driver(&das08_cs_driver); 314 return 0; 315} 316 317static 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 323static 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 334static void __exit das08_cs_exit_module(void) 335{ 336 exit_das08_pcmcia_cs(); 337 comedi_driver_unregister(&driver_das08_cs); 338} 339 340module_init(das08_cs_init_module); 341module_exit(das08_cs_exit_module); 342