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Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6
[deliverable/linux.git] / drivers / pcmcia / pcmcia_ioctl.c
1 /*
2 * pcmcia_ioctl.c -- ioctl interface for cardmgr and cardctl
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2 as
6 * published by the Free Software Foundation.
7 *
8 * The initial developer of the original code is David A. Hinds
9 * <dahinds@users.sourceforge.net>. Portions created by David A. Hinds
10 * are Copyright (C) 1999 David A. Hinds. All Rights Reserved.
11 *
12 * (C) 1999 David A. Hinds
13 * (C) 2003 - 2004 Dominik Brodowski
14 */
15
16 /*
17 * This file will go away soon.
18 */
19
20
21 #include <linux/kernel.h>
22 #include <linux/module.h>
23 #include <linux/init.h>
24 #include <linux/major.h>
25 #include <linux/errno.h>
26 #include <linux/ioctl.h>
27 #include <linux/proc_fs.h>
28 #include <linux/poll.h>
29 #include <linux/pci.h>
30 #include <linux/workqueue.h>
31
32 #define IN_CARD_SERVICES
33 #include <pcmcia/cs_types.h>
34 #include <pcmcia/cs.h>
35 #include <pcmcia/cistpl.h>
36 #include <pcmcia/ds.h>
37 #include <pcmcia/ss.h>
38
39 #include "cs_internal.h"
40 #include "ds_internal.h"
41
42 static int major_dev = -1;
43
44
45 /* Device user information */
46 #define MAX_EVENTS 32
47 #define USER_MAGIC 0x7ea4
48 #define CHECK_USER(u) \
49 (((u) == NULL) || ((u)->user_magic != USER_MAGIC))
50
51 typedef struct user_info_t {
52 u_int user_magic;
53 int event_head, event_tail;
54 event_t event[MAX_EVENTS];
55 struct user_info_t *next;
56 struct pcmcia_socket *socket;
57 } user_info_t;
58
59
60 #ifdef DEBUG
61 extern int ds_pc_debug;
62 #define cs_socket_name(skt) ((skt)->dev.class_id)
63
64 #define ds_dbg(lvl, fmt, arg...) do { \
65 if (ds_pc_debug >= lvl) \
66 printk(KERN_DEBUG "ds: " fmt , ## arg); \
67 } while (0)
68 #else
69 #define ds_dbg(lvl, fmt, arg...) do { } while (0)
70 #endif
71
72 static struct pcmcia_device *get_pcmcia_device(struct pcmcia_socket *s,
73 unsigned int function)
74 {
75 struct pcmcia_device *p_dev = NULL;
76 unsigned long flags;
77
78 spin_lock_irqsave(&pcmcia_dev_list_lock, flags);
79 list_for_each_entry(p_dev, &s->devices_list, socket_device_list) {
80 if (p_dev->func == function) {
81 spin_unlock_irqrestore(&pcmcia_dev_list_lock, flags);
82 return pcmcia_get_dev(p_dev);
83 }
84 }
85 spin_unlock_irqrestore(&pcmcia_dev_list_lock, flags);
86 return NULL;
87 }
88
89 /* backwards-compatible accessing of driver --- by name! */
90
91 static struct pcmcia_driver *get_pcmcia_driver(dev_info_t *dev_info)
92 {
93 struct device_driver *drv;
94 struct pcmcia_driver *p_drv;
95
96 drv = driver_find((char *) dev_info, &pcmcia_bus_type);
97 if (!drv)
98 return NULL;
99
100 p_drv = container_of(drv, struct pcmcia_driver, drv);
101
102 return (p_drv);
103 }
104
105
106 #ifdef CONFIG_PROC_FS
107 static struct proc_dir_entry *proc_pccard = NULL;
108
109 static int proc_read_drivers_callback(struct device_driver *driver, void *d)
110 {
111 char **p = d;
112 struct pcmcia_driver *p_drv = container_of(driver,
113 struct pcmcia_driver, drv);
114
115 *p += sprintf(*p, "%-24.24s 1 %d\n", p_drv->drv.name,
116 #ifdef CONFIG_MODULE_UNLOAD
117 (p_drv->owner) ? module_refcount(p_drv->owner) : 1
118 #else
119 1
120 #endif
121 );
122 d = (void *) p;
123
124 return 0;
125 }
126
127 static int proc_read_drivers(char *buf, char **start, off_t pos,
128 int count, int *eof, void *data)
129 {
130 char *p = buf;
131 int rc;
132
133 rc = bus_for_each_drv(&pcmcia_bus_type, NULL,
134 (void *) &p, proc_read_drivers_callback);
135 if (rc < 0)
136 return rc;
137
138 return (p - buf);
139 }
140 #endif
141
142 /*======================================================================
143
144 These manage a ring buffer of events pending for one user process
145
146 ======================================================================*/
147
148
149 static int queue_empty(user_info_t *user)
150 {
151 return (user->event_head == user->event_tail);
152 }
153
154 static event_t get_queued_event(user_info_t *user)
155 {
156 user->event_tail = (user->event_tail+1) % MAX_EVENTS;
157 return user->event[user->event_tail];
158 }
159
160 static void queue_event(user_info_t *user, event_t event)
161 {
162 user->event_head = (user->event_head+1) % MAX_EVENTS;
163 if (user->event_head == user->event_tail)
164 user->event_tail = (user->event_tail+1) % MAX_EVENTS;
165 user->event[user->event_head] = event;
166 }
167
168 void handle_event(struct pcmcia_socket *s, event_t event)
169 {
170 user_info_t *user;
171 for (user = s->user; user; user = user->next)
172 queue_event(user, event);
173 wake_up_interruptible(&s->queue);
174 }
175
176
177 /*======================================================================
178
179 bind_request() and bind_device() are merged by now. Register_client()
180 is called right at the end of bind_request(), during the driver's
181 ->attach() call. Individual descriptions:
182
183 bind_request() connects a socket to a particular client driver.
184 It looks up the specified device ID in the list of registered
185 drivers, binds it to the socket, and tries to create an instance
186 of the device. unbind_request() deletes a driver instance.
187
188 Bind_device() associates a device driver with a particular socket.
189 It is normally called by Driver Services after it has identified
190 a newly inserted card. An instance of that driver will then be
191 eligible to register as a client of this socket.
192
193 Register_client() uses the dev_info_t handle to match the
194 caller with a socket. The driver must have already been bound
195 to a socket with bind_device() -- in fact, bind_device()
196 allocates the client structure that will be used.
197
198 ======================================================================*/
199
200 static int bind_request(struct pcmcia_socket *s, bind_info_t *bind_info)
201 {
202 struct pcmcia_driver *p_drv;
203 struct pcmcia_device *p_dev;
204 int ret = 0;
205 unsigned long flags;
206
207 s = pcmcia_get_socket(s);
208 if (!s)
209 return -EINVAL;
210
211 ds_dbg(2, "bind_request(%d, '%s')\n", s->sock,
212 (char *)bind_info->dev_info);
213
214 p_drv = get_pcmcia_driver(&bind_info->dev_info);
215 if (!p_drv) {
216 ret = -EINVAL;
217 goto err_put;
218 }
219
220 if (!try_module_get(p_drv->owner)) {
221 ret = -EINVAL;
222 goto err_put_driver;
223 }
224
225 spin_lock_irqsave(&pcmcia_dev_list_lock, flags);
226 list_for_each_entry(p_dev, &s->devices_list, socket_device_list) {
227 if (p_dev->func == bind_info->function) {
228 if ((p_dev->dev.driver == &p_drv->drv)) {
229 if (p_dev->cardmgr) {
230 /* if there's already a device
231 * registered, and it was registered
232 * by userspace before, we need to
233 * return the "instance". */
234 spin_unlock_irqrestore(&pcmcia_dev_list_lock, flags);
235 bind_info->instance = p_dev;
236 ret = -EBUSY;
237 goto err_put_module;
238 } else {
239 /* the correct driver managed to bind
240 * itself magically to the correct
241 * device. */
242 spin_unlock_irqrestore(&pcmcia_dev_list_lock, flags);
243 p_dev->cardmgr = p_drv;
244 ret = 0;
245 goto err_put_module;
246 }
247 } else if (!p_dev->dev.driver) {
248 /* there's already a device available where
249 * no device has been bound to yet. So we don't
250 * need to register a device! */
251 spin_unlock_irqrestore(&pcmcia_dev_list_lock, flags);
252 goto rescan;
253 }
254 }
255 }
256 spin_unlock_irqrestore(&pcmcia_dev_list_lock, flags);
257
258 p_dev = pcmcia_device_add(s, bind_info->function);
259 if (!p_dev) {
260 ret = -EIO;
261 goto err_put_module;
262 }
263
264 rescan:
265 p_dev->cardmgr = p_drv;
266
267 /* if a driver is already running, we can abort */
268 if (p_dev->dev.driver)
269 goto err_put_module;
270
271 /*
272 * Prevent this racing with a card insertion.
273 */
274 mutex_lock(&s->skt_mutex);
275 ret = bus_rescan_devices(&pcmcia_bus_type);
276 mutex_unlock(&s->skt_mutex);
277 if (ret)
278 goto err_put_module;
279
280 /* check whether the driver indeed matched. I don't care if this
281 * is racy or not, because it can only happen on cardmgr access
282 * paths...
283 */
284 if (!(p_dev->dev.driver == &p_drv->drv))
285 p_dev->cardmgr = NULL;
286
287 err_put_module:
288 module_put(p_drv->owner);
289 err_put_driver:
290 put_driver(&p_drv->drv);
291 err_put:
292 pcmcia_put_socket(s);
293
294 return (ret);
295 } /* bind_request */
296
297 #ifdef CONFIG_CARDBUS
298
299 static struct pci_bus *pcmcia_lookup_bus(struct pcmcia_socket *s)
300 {
301 if (!s || !(s->state & SOCKET_CARDBUS))
302 return NULL;
303
304 return s->cb_dev->subordinate;
305 }
306 #endif
307
308 static int get_device_info(struct pcmcia_socket *s, bind_info_t *bind_info, int first)
309 {
310 dev_node_t *node;
311 struct pcmcia_device *p_dev;
312 struct pcmcia_driver *p_drv;
313 unsigned long flags;
314 int ret = 0;
315
316 #ifdef CONFIG_CARDBUS
317 /*
318 * Some unbelievably ugly code to associate the PCI cardbus
319 * device and its driver with the PCMCIA "bind" information.
320 */
321 {
322 struct pci_bus *bus;
323
324 bus = pcmcia_lookup_bus(s);
325 if (bus) {
326 struct list_head *list;
327 struct pci_dev *dev = NULL;
328
329 list = bus->devices.next;
330 while (list != &bus->devices) {
331 struct pci_dev *pdev = pci_dev_b(list);
332 list = list->next;
333
334 if (first) {
335 dev = pdev;
336 break;
337 }
338
339 /* Try to handle "next" here some way? */
340 }
341 if (dev && dev->driver) {
342 strlcpy(bind_info->name, dev->driver->name, DEV_NAME_LEN);
343 bind_info->major = 0;
344 bind_info->minor = 0;
345 bind_info->next = NULL;
346 return 0;
347 }
348 }
349 }
350 #endif
351
352 spin_lock_irqsave(&pcmcia_dev_list_lock, flags);
353 list_for_each_entry(p_dev, &s->devices_list, socket_device_list) {
354 if (p_dev->func == bind_info->function) {
355 p_dev = pcmcia_get_dev(p_dev);
356 if (!p_dev)
357 continue;
358 goto found;
359 }
360 }
361 spin_unlock_irqrestore(&pcmcia_dev_list_lock, flags);
362 return -ENODEV;
363
364 found:
365 spin_unlock_irqrestore(&pcmcia_dev_list_lock, flags);
366
367 p_drv = to_pcmcia_drv(p_dev->dev.driver);
368 if (p_drv && !p_dev->_locked) {
369 ret = -EAGAIN;
370 goto err_put;
371 }
372
373 if (first)
374 node = p_dev->dev_node;
375 else
376 for (node = p_dev->dev_node; node; node = node->next)
377 if (node == bind_info->next)
378 break;
379 if (!node) {
380 ret = -ENODEV;
381 goto err_put;
382 }
383
384 strlcpy(bind_info->name, node->dev_name, DEV_NAME_LEN);
385 bind_info->major = node->major;
386 bind_info->minor = node->minor;
387 bind_info->next = node->next;
388
389 err_put:
390 pcmcia_put_dev(p_dev);
391 return (ret);
392 } /* get_device_info */
393
394
395 static int ds_open(struct inode *inode, struct file *file)
396 {
397 socket_t i = iminor(inode);
398 struct pcmcia_socket *s;
399 user_info_t *user;
400 static int warning_printed = 0;
401
402 ds_dbg(0, "ds_open(socket %d)\n", i);
403
404 s = pcmcia_get_socket_by_nr(i);
405 if (!s)
406 return -ENODEV;
407 s = pcmcia_get_socket(s);
408 if (!s)
409 return -ENODEV;
410
411 if ((file->f_flags & O_ACCMODE) != O_RDONLY) {
412 if (s->pcmcia_state.busy) {
413 pcmcia_put_socket(s);
414 return -EBUSY;
415 }
416 else
417 s->pcmcia_state.busy = 1;
418 }
419
420 user = kmalloc(sizeof(user_info_t), GFP_KERNEL);
421 if (!user) {
422 pcmcia_put_socket(s);
423 return -ENOMEM;
424 }
425 user->event_tail = user->event_head = 0;
426 user->next = s->user;
427 user->user_magic = USER_MAGIC;
428 user->socket = s;
429 s->user = user;
430 file->private_data = user;
431
432 if (!warning_printed) {
433 printk(KERN_INFO "pcmcia: Detected deprecated PCMCIA ioctl "
434 "usage from process: %s.\n", current->comm);
435 printk(KERN_INFO "pcmcia: This interface will soon be removed from "
436 "the kernel; please expect breakage unless you upgrade "
437 "to new tools.\n");
438 printk(KERN_INFO "pcmcia: see http://www.kernel.org/pub/linux/"
439 "utils/kernel/pcmcia/pcmcia.html for details.\n");
440 warning_printed = 1;
441 }
442
443 if (s->pcmcia_state.present)
444 queue_event(user, CS_EVENT_CARD_INSERTION);
445 return 0;
446 } /* ds_open */
447
448 /*====================================================================*/
449
450 static int ds_release(struct inode *inode, struct file *file)
451 {
452 struct pcmcia_socket *s;
453 user_info_t *user, **link;
454
455 ds_dbg(0, "ds_release(socket %d)\n", iminor(inode));
456
457 user = file->private_data;
458 if (CHECK_USER(user))
459 goto out;
460
461 s = user->socket;
462
463 /* Unlink user data structure */
464 if ((file->f_flags & O_ACCMODE) != O_RDONLY) {
465 s->pcmcia_state.busy = 0;
466 }
467 file->private_data = NULL;
468 for (link = &s->user; *link; link = &(*link)->next)
469 if (*link == user) break;
470 if (link == NULL)
471 goto out;
472 *link = user->next;
473 user->user_magic = 0;
474 kfree(user);
475 pcmcia_put_socket(s);
476 out:
477 return 0;
478 } /* ds_release */
479
480 /*====================================================================*/
481
482 static ssize_t ds_read(struct file *file, char __user *buf,
483 size_t count, loff_t *ppos)
484 {
485 struct pcmcia_socket *s;
486 user_info_t *user;
487 int ret;
488
489 ds_dbg(2, "ds_read(socket %d)\n", iminor(file->f_dentry->d_inode));
490
491 if (count < 4)
492 return -EINVAL;
493
494 user = file->private_data;
495 if (CHECK_USER(user))
496 return -EIO;
497
498 s = user->socket;
499 if (s->pcmcia_state.dead)
500 return -EIO;
501
502 ret = wait_event_interruptible(s->queue, !queue_empty(user));
503 if (ret == 0)
504 ret = put_user(get_queued_event(user), (int __user *)buf) ? -EFAULT : 4;
505
506 return ret;
507 } /* ds_read */
508
509 /*====================================================================*/
510
511 static ssize_t ds_write(struct file *file, const char __user *buf,
512 size_t count, loff_t *ppos)
513 {
514 ds_dbg(2, "ds_write(socket %d)\n", iminor(file->f_dentry->d_inode));
515
516 if (count != 4)
517 return -EINVAL;
518 if ((file->f_flags & O_ACCMODE) == O_RDONLY)
519 return -EBADF;
520
521 return -EIO;
522 } /* ds_write */
523
524 /*====================================================================*/
525
526 /* No kernel lock - fine */
527 static u_int ds_poll(struct file *file, poll_table *wait)
528 {
529 struct pcmcia_socket *s;
530 user_info_t *user;
531
532 ds_dbg(2, "ds_poll(socket %d)\n", iminor(file->f_dentry->d_inode));
533
534 user = file->private_data;
535 if (CHECK_USER(user))
536 return POLLERR;
537 s = user->socket;
538 /*
539 * We don't check for a dead socket here since that
540 * will send cardmgr into an endless spin.
541 */
542 poll_wait(file, &s->queue, wait);
543 if (!queue_empty(user))
544 return POLLIN | POLLRDNORM;
545 return 0;
546 } /* ds_poll */
547
548 /*====================================================================*/
549
550 extern int pcmcia_adjust_resource_info(adjust_t *adj);
551
552 static int ds_ioctl(struct inode * inode, struct file * file,
553 u_int cmd, u_long arg)
554 {
555 struct pcmcia_socket *s;
556 void __user *uarg = (char __user *)arg;
557 u_int size;
558 int ret, err;
559 ds_ioctl_arg_t *buf;
560 user_info_t *user;
561
562 ds_dbg(2, "ds_ioctl(socket %d, %#x, %#lx)\n", iminor(inode), cmd, arg);
563
564 user = file->private_data;
565 if (CHECK_USER(user))
566 return -EIO;
567
568 s = user->socket;
569 if (s->pcmcia_state.dead)
570 return -EIO;
571
572 size = (cmd & IOCSIZE_MASK) >> IOCSIZE_SHIFT;
573 if (size > sizeof(ds_ioctl_arg_t)) return -EINVAL;
574
575 /* Permission check */
576 if (!(cmd & IOC_OUT) && !capable(CAP_SYS_ADMIN))
577 return -EPERM;
578
579 if (cmd & IOC_IN) {
580 if (!access_ok(VERIFY_READ, uarg, size)) {
581 ds_dbg(3, "ds_ioctl(): verify_read = %d\n", -EFAULT);
582 return -EFAULT;
583 }
584 }
585 if (cmd & IOC_OUT) {
586 if (!access_ok(VERIFY_WRITE, uarg, size)) {
587 ds_dbg(3, "ds_ioctl(): verify_write = %d\n", -EFAULT);
588 return -EFAULT;
589 }
590 }
591 buf = kmalloc(sizeof(ds_ioctl_arg_t), GFP_KERNEL);
592 if (!buf)
593 return -ENOMEM;
594
595 err = ret = 0;
596
597 if (cmd & IOC_IN) __copy_from_user((char *)buf, uarg, size);
598
599 switch (cmd) {
600 case DS_ADJUST_RESOURCE_INFO:
601 ret = pcmcia_adjust_resource_info(&buf->adjust);
602 break;
603 case DS_GET_CONFIGURATION_INFO:
604 if (buf->config.Function &&
605 (buf->config.Function >= s->functions))
606 ret = CS_BAD_ARGS;
607 else {
608 struct pcmcia_device *p_dev = get_pcmcia_device(s, buf->config.Function);
609 ret = pccard_get_configuration_info(s, p_dev, &buf->config);
610 pcmcia_put_dev(p_dev);
611 }
612 break;
613 case DS_GET_FIRST_TUPLE:
614 mutex_lock(&s->skt_mutex);
615 pcmcia_validate_mem(s);
616 mutex_unlock(&s->skt_mutex);
617 ret = pccard_get_first_tuple(s, BIND_FN_ALL, &buf->tuple);
618 break;
619 case DS_GET_NEXT_TUPLE:
620 ret = pccard_get_next_tuple(s, BIND_FN_ALL, &buf->tuple);
621 break;
622 case DS_GET_TUPLE_DATA:
623 buf->tuple.TupleData = buf->tuple_parse.data;
624 buf->tuple.TupleDataMax = sizeof(buf->tuple_parse.data);
625 ret = pccard_get_tuple_data(s, &buf->tuple);
626 break;
627 case DS_PARSE_TUPLE:
628 buf->tuple.TupleData = buf->tuple_parse.data;
629 ret = pccard_parse_tuple(&buf->tuple, &buf->tuple_parse.parse);
630 break;
631 case DS_RESET_CARD:
632 ret = pccard_reset_card(s);
633 break;
634 case DS_GET_STATUS:
635 if (buf->status.Function &&
636 (buf->status.Function >= s->functions))
637 ret = CS_BAD_ARGS;
638 else {
639 struct pcmcia_device *p_dev = get_pcmcia_device(s, buf->status.Function);
640 ret = pccard_get_status(s, p_dev, &buf->status);
641 pcmcia_put_dev(p_dev);
642 }
643 break;
644 case DS_VALIDATE_CIS:
645 mutex_lock(&s->skt_mutex);
646 pcmcia_validate_mem(s);
647 mutex_unlock(&s->skt_mutex);
648 ret = pccard_validate_cis(s, BIND_FN_ALL, &buf->cisinfo);
649 break;
650 case DS_SUSPEND_CARD:
651 ret = pcmcia_suspend_card(s);
652 break;
653 case DS_RESUME_CARD:
654 ret = pcmcia_resume_card(s);
655 break;
656 case DS_EJECT_CARD:
657 err = pcmcia_eject_card(s);
658 break;
659 case DS_INSERT_CARD:
660 err = pcmcia_insert_card(s);
661 break;
662 case DS_ACCESS_CONFIGURATION_REGISTER:
663 if ((buf->conf_reg.Action == CS_WRITE) && !capable(CAP_SYS_ADMIN)) {
664 err = -EPERM;
665 goto free_out;
666 }
667
668 ret = CS_BAD_ARGS;
669
670 if (!(buf->conf_reg.Function &&
671 (buf->conf_reg.Function >= s->functions))) {
672 struct pcmcia_device *p_dev = get_pcmcia_device(s, buf->conf_reg.Function);
673 if (p_dev) {
674 ret = pcmcia_access_configuration_register(p_dev, &buf->conf_reg);
675 pcmcia_put_dev(p_dev);
676 }
677 }
678 break;
679 case DS_GET_FIRST_REGION:
680 case DS_GET_NEXT_REGION:
681 case DS_BIND_MTD:
682 if (!capable(CAP_SYS_ADMIN)) {
683 err = -EPERM;
684 goto free_out;
685 } else {
686 static int printed = 0;
687 if (!printed) {
688 printk(KERN_WARNING "2.6. kernels use pcmciamtd instead of memory_cs.c and do not require special\n");
689 printk(KERN_WARNING "MTD handling any more.\n");
690 printed++;
691 }
692 }
693 err = -EINVAL;
694 goto free_out;
695 break;
696 case DS_GET_FIRST_WINDOW:
697 ret = pcmcia_get_window(s, &buf->win_info.handle, 0,
698 &buf->win_info.window);
699 break;
700 case DS_GET_NEXT_WINDOW:
701 ret = pcmcia_get_window(s, &buf->win_info.handle,
702 buf->win_info.handle->index + 1, &buf->win_info.window);
703 break;
704 case DS_GET_MEM_PAGE:
705 ret = pcmcia_get_mem_page(buf->win_info.handle,
706 &buf->win_info.map);
707 break;
708 case DS_REPLACE_CIS:
709 ret = pcmcia_replace_cis(s, &buf->cisdump);
710 break;
711 case DS_BIND_REQUEST:
712 if (!capable(CAP_SYS_ADMIN)) {
713 err = -EPERM;
714 goto free_out;
715 }
716 err = bind_request(s, &buf->bind_info);
717 break;
718 case DS_GET_DEVICE_INFO:
719 err = get_device_info(s, &buf->bind_info, 1);
720 break;
721 case DS_GET_NEXT_DEVICE:
722 err = get_device_info(s, &buf->bind_info, 0);
723 break;
724 case DS_UNBIND_REQUEST:
725 err = 0;
726 break;
727 default:
728 err = -EINVAL;
729 }
730
731 if ((err == 0) && (ret != CS_SUCCESS)) {
732 ds_dbg(2, "ds_ioctl: ret = %d\n", ret);
733 switch (ret) {
734 case CS_BAD_SOCKET: case CS_NO_CARD:
735 err = -ENODEV; break;
736 case CS_BAD_ARGS: case CS_BAD_ATTRIBUTE: case CS_BAD_IRQ:
737 case CS_BAD_TUPLE:
738 err = -EINVAL; break;
739 case CS_IN_USE:
740 err = -EBUSY; break;
741 case CS_OUT_OF_RESOURCE:
742 err = -ENOSPC; break;
743 case CS_NO_MORE_ITEMS:
744 err = -ENODATA; break;
745 case CS_UNSUPPORTED_FUNCTION:
746 err = -ENOSYS; break;
747 default:
748 err = -EIO; break;
749 }
750 }
751
752 if (cmd & IOC_OUT) {
753 if (__copy_to_user(uarg, (char *)buf, size))
754 err = -EFAULT;
755 }
756
757 free_out:
758 kfree(buf);
759 return err;
760 } /* ds_ioctl */
761
762 /*====================================================================*/
763
764 static struct file_operations ds_fops = {
765 .owner = THIS_MODULE,
766 .open = ds_open,
767 .release = ds_release,
768 .ioctl = ds_ioctl,
769 .read = ds_read,
770 .write = ds_write,
771 .poll = ds_poll,
772 };
773
774 void __init pcmcia_setup_ioctl(void) {
775 int i;
776
777 /* Set up character device for user mode clients */
778 i = register_chrdev(0, "pcmcia", &ds_fops);
779 if (i < 0)
780 printk(KERN_NOTICE "unable to find a free device # for "
781 "Driver Services (error=%d)\n", i);
782 else
783 major_dev = i;
784
785 #ifdef CONFIG_PROC_FS
786 proc_pccard = proc_mkdir("pccard", proc_bus);
787 if (proc_pccard)
788 create_proc_read_entry("drivers",0,proc_pccard,proc_read_drivers,NULL);
789 #endif
790 }
791
792
793 void __exit pcmcia_cleanup_ioctl(void) {
794 #ifdef CONFIG_PROC_FS
795 if (proc_pccard) {
796 remove_proc_entry("drivers", proc_pccard);
797 remove_proc_entry("pccard", proc_bus);
798 }
799 #endif
800 if (major_dev != -1)
801 unregister_chrdev(major_dev, "pcmcia");
802 }
Linux kernel - Deliverables
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