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GUI: Fix Tomato RAF theme for all builds. Compilation typo.
[tomato.git] / release / src-rt-6.x.4708 / linux / linux-2.6.36 / drivers / staging / vme / devices / vme_user.c
blob4fbc7d202412229dc5bd5586873e990fb693abd5
1 /*
2 * VMEbus User access driver
3 *
4 * Author: Martyn Welch <martyn.welch@ge.com>
5 * Copyright 2008 GE Intelligent Platforms Embedded Systems, Inc.
6 *
7 * Based on work by:
8 * Tom Armistead and Ajit Prem
9 * Copyright 2004 Motorola Inc.
10 *
11 *
12 * This program is free software; you can redistribute it and/or modify it
13 * under the terms of the GNU General Public License as published by the
14 * Free Software Foundation; either version 2 of the License, or (at your
15 * option) any later version.
16 */
17
18 #include <linux/cdev.h>
19 #include <linux/delay.h>
20 #include <linux/device.h>
21 #include <linux/dma-mapping.h>
22 #include <linux/errno.h>
23 #include <linux/init.h>
24 #include <linux/ioctl.h>
25 #include <linux/kernel.h>
26 #include <linux/mm.h>
27 #include <linux/module.h>
28 #include <linux/pagemap.h>
29 #include <linux/pci.h>
30 #include <linux/semaphore.h>
31 #include <linux/slab.h>
32 #include <linux/spinlock.h>
33 #include <linux/syscalls.h>
34 #include <linux/mutex.h>
35 #include <linux/types.h>
36
37 #include <linux/io.h>
38 #include <linux/uaccess.h>
39
40 #include "../vme.h"
41 #include "vme_user.h"
42
43 static DEFINE_MUTEX(vme_user_mutex);
44 static char driver_name[] = "vme_user";
45
46 static int bus[USER_BUS_MAX];
47 static int bus_num;
48
49 /* Currently Documentation/devices.txt defines the following for VME:
50 *
51 * 221 char VME bus
52 * 0 = /dev/bus/vme/m0 First master image
53 * 1 = /dev/bus/vme/m1 Second master image
54 * 2 = /dev/bus/vme/m2 Third master image
55 * 3 = /dev/bus/vme/m3 Fourth master image
56 * 4 = /dev/bus/vme/s0 First slave image
57 * 5 = /dev/bus/vme/s1 Second slave image
58 * 6 = /dev/bus/vme/s2 Third slave image
59 * 7 = /dev/bus/vme/s3 Fourth slave image
60 * 8 = /dev/bus/vme/ctl Control
61 *
62 * It is expected that all VME bus drivers will use the
63 * same interface. For interface documentation see
64 * http://www.vmelinux.org/.
65 *
66 * However the VME driver at http://www.vmelinux.org/ is rather old and doesn't
67 * even support the tsi148 chipset (which has 8 master and 8 slave windows).
68 * We'll run with this or now as far as possible, however it probably makes
69 * sense to get rid of the old mappings and just do everything dynamically.
70 *
71 * So for now, we'll restrict the driver to providing 4 masters and 4 slaves as
72 * defined above and try to support at least some of the interface from
73 * http://www.vmelinux.org/ as an alternative drive can be written providing a
74 * saner interface later.
75 *
76 * The vmelinux.org driver never supported slave images, the devices reserved
77 * for slaves were repurposed to support all 8 master images on the UniverseII!
78 * We shall support 4 masters and 4 slaves with this driver.
79 */
80 #define VME_MAJOR 221 /* VME Major Device Number */
81 #define VME_DEVS 9 /* Number of dev entries */
82
83 #define MASTER_MINOR 0
84 #define MASTER_MAX 3
85 #define SLAVE_MINOR 4
86 #define SLAVE_MAX 7
87 #define CONTROL_MINOR 8
88
89 #define PCI_BUF_SIZE 0x20000 /* Size of one slave image buffer */
90
91 /*
92 * Structure to handle image related parameters.
93 */
94 typedef struct {
95 void __iomem *kern_buf; /* Buffer address in kernel space */
96 dma_addr_t pci_buf; /* Buffer address in PCI address space */
97 unsigned long long size_buf; /* Buffer size */
98 struct semaphore sem; /* Semaphore for locking image */
99 struct device *device; /* Sysfs device */
100 struct vme_resource *resource; /* VME resource */
101 int users; /* Number of current users */
102 } image_desc_t;
103 static image_desc_t image[VME_DEVS];
104
105 typedef struct {
106 unsigned long reads;
107 unsigned long writes;
108 unsigned long ioctls;
109 unsigned long irqs;
110 unsigned long berrs;
111 unsigned long dmaErrors;
112 unsigned long timeouts;
113 unsigned long external;
114 } driver_stats_t;
115 static driver_stats_t statistics;
116
117 struct cdev *vme_user_cdev; /* Character device */
118 struct class *vme_user_sysfs_class; /* Sysfs class */
119 struct device *vme_user_bridge; /* Pointer to the bridge device */
120
121
122 static const int type[VME_DEVS] = { MASTER_MINOR, MASTER_MINOR,
123 MASTER_MINOR, MASTER_MINOR,
124 SLAVE_MINOR, SLAVE_MINOR,
125 SLAVE_MINOR, SLAVE_MINOR,
126 CONTROL_MINOR
127 };
128
129
130 static int vme_user_open(struct inode *, struct file *);
131 static int vme_user_release(struct inode *, struct file *);
132 static ssize_t vme_user_read(struct file *, char *, size_t, loff_t *);
133 static ssize_t vme_user_write(struct file *, const char *, size_t, loff_t *);
134 static loff_t vme_user_llseek(struct file *, loff_t, int);
135 static long vme_user_unlocked_ioctl(struct file *, unsigned int, unsigned long);
136
137 static int __init vme_user_probe(struct device *, int, int);
138 static int __exit vme_user_remove(struct device *, int, int);
139
140 static struct file_operations vme_user_fops = {
141 .open = vme_user_open,
142 .release = vme_user_release,
143 .read = vme_user_read,
144 .write = vme_user_write,
145 .llseek = vme_user_llseek,
146 .unlocked_ioctl = vme_user_unlocked_ioctl,
147 };
148
149
150 /*
151 * Reset all the statistic counters
152 */
153 static void reset_counters(void)
154 {
155 statistics.reads = 0;
156 statistics.writes = 0;
157 statistics.ioctls = 0;
158 statistics.irqs = 0;
159 statistics.berrs = 0;
160 statistics.dmaErrors = 0;
161 statistics.timeouts = 0;
162 }
163
164 static int vme_user_open(struct inode *inode, struct file *file)
165 {
166 int err;
167 unsigned int minor = MINOR(inode->i_rdev);
168
169 down(&image[minor].sem);
170 /* Only allow device to be opened if a resource is allocated */
171 if (image[minor].resource == NULL) {
172 printk(KERN_ERR "No resources allocated for device\n");
173 err = -EINVAL;
174 goto err_res;
175 }
176
177 /* Increment user count */
178 image[minor].users++;
179
180 up(&image[minor].sem);
181
182 return 0;
183
184 err_res:
185 up(&image[minor].sem);
186
187 return err;
188 }
189
190 static int vme_user_release(struct inode *inode, struct file *file)
191 {
192 unsigned int minor = MINOR(inode->i_rdev);
193
194 down(&image[minor].sem);
195
196 /* Decrement user count */
197 image[minor].users--;
198
199 up(&image[minor].sem);
200
201 return 0;
202 }
203
204 /*
205 * We are going ot alloc a page during init per window for small transfers.
206 * Small transfers will go VME -> buffer -> user space. Larger (more than a
207 * page) transfers will lock the user space buffer into memory and then
208 * transfer the data directly into the user space buffers.
209 */
210 static ssize_t resource_to_user(int minor, char __user *buf, size_t count,
211 loff_t *ppos)
212 {
213 ssize_t retval;
214 ssize_t copied = 0;
215
216 if (count <= image[minor].size_buf) {
217 /* We copy to kernel buffer */
218 copied = vme_master_read(image[minor].resource,
219 image[minor].kern_buf, count, *ppos);
220 if (copied < 0)
221 return (int)copied;
222
223 retval = __copy_to_user(buf, image[minor].kern_buf,
224 (unsigned long)copied);
225 if (retval != 0) {
226 copied = (copied - retval);
227 printk(KERN_INFO "User copy failed\n");
228 return -EINVAL;
229 }
230
231 } else {
232 printk(KERN_INFO "Currently don't support large transfers\n");
233 /* Map in pages from userspace */
234
235 /* Call vme_master_read to do the transfer */
236 return -EINVAL;
237 }
238
239 return copied;
240 }
241
242 /*
243 * We are going ot alloc a page during init per window for small transfers.
244 * Small transfers will go user space -> buffer -> VME. Larger (more than a
245 * page) transfers will lock the user space buffer into memory and then
246 * transfer the data directly from the user space buffers out to VME.
247 */
248 static ssize_t resource_from_user(unsigned int minor, const char *buf,
249 size_t count, loff_t *ppos)
250 {
251 ssize_t retval;
252 ssize_t copied = 0;
253
254 if (count <= image[minor].size_buf) {
255 retval = __copy_from_user(image[minor].kern_buf, buf,
256 (unsigned long)count);
257 if (retval != 0)
258 copied = (copied - retval);
259 else
260 copied = count;
261
262 copied = vme_master_write(image[minor].resource,
263 image[minor].kern_buf, copied, *ppos);
264 } else {
265 printk(KERN_INFO "Currently don't support large transfers\n");
266 /* Map in pages from userspace */
267
268 /* Call vme_master_write to do the transfer */
269 return -EINVAL;
270 }
271
272 return copied;
273 }
274
275 static ssize_t buffer_to_user(unsigned int minor, char __user *buf,
276 size_t count, loff_t *ppos)
277 {
278 void __iomem *image_ptr;
279 ssize_t retval;
280
281 image_ptr = image[minor].kern_buf + *ppos;
282
283 retval = __copy_to_user(buf, image_ptr, (unsigned long)count);
284 if (retval != 0) {
285 retval = (count - retval);
286 printk(KERN_WARNING "Partial copy to userspace\n");
287 } else
288 retval = count;
289
290 /* Return number of bytes successfully read */
291 return retval;
292 }
293
294 static ssize_t buffer_from_user(unsigned int minor, const char *buf,
295 size_t count, loff_t *ppos)
296 {
297 void __iomem *image_ptr;
298 size_t retval;
299
300 image_ptr = image[minor].kern_buf + *ppos;
301
302 retval = __copy_from_user(image_ptr, buf, (unsigned long)count);
303 if (retval != 0) {
304 retval = (count - retval);
305 printk(KERN_WARNING "Partial copy to userspace\n");
306 } else
307 retval = count;
308
309 /* Return number of bytes successfully read */
310 return retval;
311 }
312
313 static ssize_t vme_user_read(struct file *file, char *buf, size_t count,
314 loff_t *ppos)
315 {
316 unsigned int minor = MINOR(file->f_dentry->d_inode->i_rdev);
317 ssize_t retval;
318 size_t image_size;
319 size_t okcount;
320
321 down(&image[minor].sem);
322
323 image_size = vme_get_size(image[minor].resource);
324
325 /* Ensure we are starting at a valid location */
326 if ((*ppos < 0) || (*ppos > (image_size - 1))) {
327 up(&image[minor].sem);
328 return 0;
329 }
330
331 /* Ensure not reading past end of the image */
332 if (*ppos + count > image_size)
333 okcount = image_size - *ppos;
334 else
335 okcount = count;
336
337 switch (type[minor]) {
338 case MASTER_MINOR:
339 retval = resource_to_user(minor, buf, okcount, ppos);
340 break;
341 case SLAVE_MINOR:
342 retval = buffer_to_user(minor, buf, okcount, ppos);
343 break;
344 default:
345 retval = -EINVAL;
346 }
347
348 up(&image[minor].sem);
349
350 if (retval > 0)
351 *ppos += retval;
352
353 return retval;
354 }
355
356 static ssize_t vme_user_write(struct file *file, const char *buf, size_t count,
357 loff_t *ppos)
358 {
359 unsigned int minor = MINOR(file->f_dentry->d_inode->i_rdev);
360 ssize_t retval;
361 size_t image_size;
362 size_t okcount;
363
364 down(&image[minor].sem);
365
366 image_size = vme_get_size(image[minor].resource);
367
368 /* Ensure we are starting at a valid location */
369 if ((*ppos < 0) || (*ppos > (image_size - 1))) {
370 up(&image[minor].sem);
371 return 0;
372 }
373
374 /* Ensure not reading past end of the image */
375 if (*ppos + count > image_size)
376 okcount = image_size - *ppos;
377 else
378 okcount = count;
379
380 switch (type[minor]) {
381 case MASTER_MINOR:
382 retval = resource_from_user(minor, buf, okcount, ppos);
383 break;
384 case SLAVE_MINOR:
385 retval = buffer_from_user(minor, buf, okcount, ppos);
386 break;
387 default:
388 retval = -EINVAL;
389 }
390
391 up(&image[minor].sem);
392
393 if (retval > 0)
394 *ppos += retval;
395
396 return retval;
397 }
398
399 static loff_t vme_user_llseek(struct file *file, loff_t off, int whence)
400 {
401 loff_t absolute = -1;
402 unsigned int minor = MINOR(file->f_dentry->d_inode->i_rdev);
403 size_t image_size;
404
405 down(&image[minor].sem);
406 image_size = vme_get_size(image[minor].resource);
407
408 switch (whence) {
409 case SEEK_SET:
410 absolute = off;
411 break;
412 case SEEK_CUR:
413 absolute = file->f_pos + off;
414 break;
415 case SEEK_END:
416 absolute = image_size + off;
417 break;
418 default:
419 up(&image[minor].sem);
420 return -EINVAL;
421 break;
422 }
423
424 if ((absolute < 0) || (absolute >= image_size)) {
425 up(&image[minor].sem);
426 return -EINVAL;
427 }
428
429 file->f_pos = absolute;
430
431 up(&image[minor].sem);
432
433 return absolute;
434 }
435
436 /*
437 * The ioctls provided by the old VME access method (the one at vmelinux.org)
438 * are most certainly wrong as the effectively push the registers layout
439 * through to user space. Given that the VME core can handle multiple bridges,
440 * with different register layouts this is most certainly not the way to go.
441 *
442 * We aren't using the structures defined in the Motorola driver either - these
443 * are also quite low level, however we should use the definitions that have
444 * already been defined.
445 */
446 static int vme_user_ioctl(struct inode *inode, struct file *file,
447 unsigned int cmd, unsigned long arg)
448 {
449 struct vme_master master;
450 struct vme_slave slave;
451 unsigned long copied;
452 unsigned int minor = MINOR(inode->i_rdev);
453 int retval;
454 dma_addr_t pci_addr;
455
456 statistics.ioctls++;
457
458 switch (type[minor]) {
459 case CONTROL_MINOR:
460 break;
461 case MASTER_MINOR:
462 switch (cmd) {
463 case VME_GET_MASTER:
464 memset(&master, 0, sizeof(struct vme_master));
465
466 retval = vme_master_get(image[minor].resource,
467 &(master.enable), &(master.vme_addr),
468 &(master.size), &(master.aspace),
469 &(master.cycle), &(master.dwidth));
470
471 copied = copy_to_user((char *)arg, &master,
472 sizeof(struct vme_master));
473 if (copied != 0) {
474 printk(KERN_WARNING "Partial copy to "
475 "userspace\n");
476 return -EFAULT;
477 }
478
479 return retval;
480 break;
481
482 case VME_SET_MASTER:
483
484 copied = copy_from_user(&master, (char *)arg,
485 sizeof(master));
486 if (copied != 0) {
487 printk(KERN_WARNING "Partial copy from "
488 "userspace\n");
489 return -EFAULT;
490 }
491
492 return vme_master_set(image[minor].resource,
493 master.enable, master.vme_addr, master.size,
494 master.aspace, master.cycle, master.dwidth);
495
496 break;
497 }
498 break;
499 case SLAVE_MINOR:
500 switch (cmd) {
501 case VME_GET_SLAVE:
502 memset(&slave, 0, sizeof(struct vme_slave));
503
504 retval = vme_slave_get(image[minor].resource,
505 &(slave.enable), &(slave.vme_addr),
506 &(slave.size), &pci_addr, &(slave.aspace),
507 &(slave.cycle));
508
509 copied = copy_to_user((char *)arg, &slave,
510 sizeof(struct vme_slave));
511 if (copied != 0) {
512 printk(KERN_WARNING "Partial copy to "
513 "userspace\n");
514 return -EFAULT;
515 }
516
517 return retval;
518 break;
519
520 case VME_SET_SLAVE:
521
522 copied = copy_from_user(&slave, (char *)arg,
523 sizeof(slave));
524 if (copied != 0) {
525 printk(KERN_WARNING "Partial copy from "
526 "userspace\n");
527 return -EFAULT;
528 }
529
530 return vme_slave_set(image[minor].resource,
531 slave.enable, slave.vme_addr, slave.size,
532 image[minor].pci_buf, slave.aspace,
533 slave.cycle);
534
535 break;
536 }
537 break;
538 }
539
540 return -EINVAL;
541 }
542
543 static long
544 vme_user_unlocked_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
545 {
546 int ret;
547
548 mutex_lock(&vme_user_mutex);
549 ret = vme_user_ioctl(file->f_path.dentry->d_inode, file, cmd, arg);
550 mutex_unlock(&vme_user_mutex);
551
552 return ret;
553 }
554
555
556 /*
557 * Unallocate a previously allocated buffer
558 */
559 static void buf_unalloc(int num)
560 {
561 if (image[num].kern_buf) {
562 #ifdef VME_DEBUG
563 printk(KERN_DEBUG "UniverseII:Releasing buffer at %p\n",
564 image[num].pci_buf);
565 #endif
566
567 vme_free_consistent(image[num].resource, image[num].size_buf,
568 image[num].kern_buf, image[num].pci_buf);
569
570 image[num].kern_buf = NULL;
571 image[num].pci_buf = 0;
572 image[num].size_buf = 0;
573
574 #ifdef VME_DEBUG
575 } else {
576 printk(KERN_DEBUG "UniverseII: Buffer not allocated\n");
577 #endif
578 }
579 }
580
581 static struct vme_driver vme_user_driver = {
582 .name = driver_name,
583 .probe = vme_user_probe,
584 .remove = vme_user_remove,
585 };
586
587
588 static int __init vme_user_init(void)
589 {
590 int retval = 0;
591 int i;
592 struct vme_device_id *ids;
593
594 printk(KERN_INFO "VME User Space Access Driver\n");
595
596 if (bus_num == 0) {
597 printk(KERN_ERR "%s: No cards, skipping registration\n",
598 driver_name);
599 goto err_nocard;
600 }
601
602 /* Let's start by supporting one bus, we can support more than one
603 * in future revisions if that ever becomes necessary.
604 */
605 if (bus_num > USER_BUS_MAX) {
606 printk(KERN_ERR "%s: Driver only able to handle %d buses\n",
607 driver_name, USER_BUS_MAX);
608 bus_num = USER_BUS_MAX;
609 }
610
611
612 /* Dynamically create the bind table based on module parameters */
613 ids = kmalloc(sizeof(struct vme_device_id) * (bus_num + 1), GFP_KERNEL);
614 if (ids == NULL) {
615 printk(KERN_ERR "%s: Unable to allocate ID table\n",
616 driver_name);
617 goto err_id;
618 }
619
620 memset(ids, 0, (sizeof(struct vme_device_id) * (bus_num + 1)));
621
622 for (i = 0; i < bus_num; i++) {
623 ids[i].bus = bus[i];
624 /*
625 * We register the driver against the slot occupied by *this*
626 * card, since it's really a low level way of controlling
627 * the VME bridge
628 */
629 ids[i].slot = VME_SLOT_CURRENT;
630 }
631
632 vme_user_driver.bind_table = ids;
633
634 retval = vme_register_driver(&vme_user_driver);
635 if (retval != 0)
636 goto err_reg;
637
638 return retval;
639
640 vme_unregister_driver(&vme_user_driver);
641 err_reg:
642 kfree(ids);
643 err_id:
644 err_nocard:
645 return retval;
646 }
647
648 /*
649 * In this simple access driver, the old behaviour is being preserved as much
650 * as practical. We will therefore reserve the buffers and request the images
651 * here so that we don't have to do it later.
652 */
653 static int __init vme_user_probe(struct device *dev, int cur_bus, int cur_slot)
654 {
655 int i, err;
656 char name[12];
657
658 /* Save pointer to the bridge device */
659 if (vme_user_bridge != NULL) {
660 printk(KERN_ERR "%s: Driver can only be loaded for 1 device\n",
661 driver_name);
662 err = -EINVAL;
663 goto err_dev;
664 }
665 vme_user_bridge = dev;
666
667 /* Initialise descriptors */
668 for (i = 0; i < VME_DEVS; i++) {
669 image[i].kern_buf = NULL;
670 image[i].pci_buf = 0;
671 init_MUTEX(&(image[i].sem));
672 image[i].device = NULL;
673 image[i].resource = NULL;
674 image[i].users = 0;
675 }
676
677 /* Initialise statistics counters */
678 reset_counters();
679
680 /* Assign major and minor numbers for the driver */
681 err = register_chrdev_region(MKDEV(VME_MAJOR, 0), VME_DEVS,
682 driver_name);
683 if (err) {
684 printk(KERN_WARNING "%s: Error getting Major Number %d for "
685 "driver.\n", driver_name, VME_MAJOR);
686 goto err_region;
687 }
688
689 /* Register the driver as a char device */
690 vme_user_cdev = cdev_alloc();
691 vme_user_cdev->ops = &vme_user_fops;
692 vme_user_cdev->owner = THIS_MODULE;
693 err = cdev_add(vme_user_cdev, MKDEV(VME_MAJOR, 0), VME_DEVS);
694 if (err) {
695 printk(KERN_WARNING "%s: cdev_all failed\n", driver_name);
696 goto err_char;
697 }
698
699 /* Request slave resources and allocate buffers (128kB wide) */
700 for (i = SLAVE_MINOR; i < (SLAVE_MAX + 1); i++) {
701 /* For ca91cx42 bridge there are only two slave windows
702 * supporting A16 addressing, so we request A24 supported
703 * by all windows.
704 */
705 image[i].resource = vme_slave_request(vme_user_bridge,
706 VME_A24, VME_SCT);
707 if (image[i].resource == NULL) {
708 printk(KERN_WARNING "Unable to allocate slave "
709 "resource\n");
710 goto err_slave;
711 }
712 image[i].size_buf = PCI_BUF_SIZE;
713 image[i].kern_buf = vme_alloc_consistent(image[i].resource,
714 image[i].size_buf, &(image[i].pci_buf));
715 if (image[i].kern_buf == NULL) {
716 printk(KERN_WARNING "Unable to allocate memory for "
717 "buffer\n");
718 image[i].pci_buf = 0;
719 vme_slave_free(image[i].resource);
720 err = -ENOMEM;
721 goto err_slave;
722 }
723 }
724
725 /*
726 * Request master resources allocate page sized buffers for small
727 * reads and writes
728 */
729 for (i = MASTER_MINOR; i < (MASTER_MAX + 1); i++) {
730 image[i].resource = vme_master_request(vme_user_bridge,
731 VME_A32, VME_SCT, VME_D32);
732 if (image[i].resource == NULL) {
733 printk(KERN_WARNING "Unable to allocate master "
734 "resource\n");
735 goto err_master;
736 }
737 image[i].size_buf = PCI_BUF_SIZE;
738 image[i].kern_buf = kmalloc(image[i].size_buf, GFP_KERNEL);
739 if (image[i].kern_buf == NULL) {
740 printk(KERN_WARNING "Unable to allocate memory for "
741 "master window buffers\n");
742 err = -ENOMEM;
743 goto err_master_buf;
744 }
745 }
746
747 /* Create sysfs entries - on udev systems this creates the dev files */
748 vme_user_sysfs_class = class_create(THIS_MODULE, driver_name);
749 if (IS_ERR(vme_user_sysfs_class)) {
750 printk(KERN_ERR "Error creating vme_user class.\n");
751 err = PTR_ERR(vme_user_sysfs_class);
752 goto err_class;
753 }
754
755 /* Add sysfs Entries */
756 for (i = 0; i < VME_DEVS; i++) {
757 switch (type[i]) {
758 case MASTER_MINOR:
759 sprintf(name, "bus/vme/m%%d");
760 break;
761 case CONTROL_MINOR:
762 sprintf(name, "bus/vme/ctl");
763 break;
764 case SLAVE_MINOR:
765 sprintf(name, "bus/vme/s%%d");
766 break;
767 default:
768 err = -EINVAL;
769 goto err_sysfs;
770 break;
771 }
772
773 image[i].device =
774 device_create(vme_user_sysfs_class, NULL,
775 MKDEV(VME_MAJOR, i), NULL, name,
776 (type[i] == SLAVE_MINOR) ? i - (MASTER_MAX + 1) : i);
777 if (IS_ERR(image[i].device)) {
778 printk(KERN_INFO "%s: Error creating sysfs device\n",
779 driver_name);
780 err = PTR_ERR(image[i].device);
781 goto err_sysfs;
782 }
783 }
784
785 return 0;
786
787 /* Ensure counter set correcty to destroy all sysfs devices */
788 i = VME_DEVS;
789 err_sysfs:
790 while (i > 0) {
791 i--;
792 device_destroy(vme_user_sysfs_class, MKDEV(VME_MAJOR, i));
793 }
794 class_destroy(vme_user_sysfs_class);
795
796 /* Ensure counter set correcty to unalloc all master windows */
797 i = MASTER_MAX + 1;
798 err_master_buf:
799 for (i = MASTER_MINOR; i < (MASTER_MAX + 1); i++)
800 kfree(image[i].kern_buf);
801 err_master:
802 while (i > MASTER_MINOR) {
803 i--;
804 vme_master_free(image[i].resource);
805 }
806
807 /*
808 * Ensure counter set correcty to unalloc all slave windows and buffers
809 */
810 i = SLAVE_MAX + 1;
811 err_slave:
812 while (i > SLAVE_MINOR) {
813 i--;
814 vme_slave_free(image[i].resource);
815 buf_unalloc(i);
816 }
817 err_class:
818 cdev_del(vme_user_cdev);
819 err_char:
820 unregister_chrdev_region(MKDEV(VME_MAJOR, 0), VME_DEVS);
821 err_region:
822 err_dev:
823 return err;
824 }
825
826 static int __exit vme_user_remove(struct device *dev, int cur_bus, int cur_slot)
827 {
828 int i;
829
830 /* Remove sysfs Entries */
831 for (i = 0; i < VME_DEVS; i++)
832 device_destroy(vme_user_sysfs_class, MKDEV(VME_MAJOR, i));
833 class_destroy(vme_user_sysfs_class);
834
835 for (i = MASTER_MINOR; i < (MASTER_MAX + 1); i++)
836 kfree(image[i].kern_buf);
837
838 for (i = SLAVE_MINOR; i < (SLAVE_MAX + 1); i++) {
839 vme_slave_set(image[i].resource, 0, 0, 0, 0, VME_A32, 0);
840 vme_slave_free(image[i].resource);
841 buf_unalloc(i);
842 }
843
844 /* Unregister device driver */
845 cdev_del(vme_user_cdev);
846
847 /* Unregiser the major and minor device numbers */
848 unregister_chrdev_region(MKDEV(VME_MAJOR, 0), VME_DEVS);
849
850 return 0;
851 }
852
853 static void __exit vme_user_exit(void)
854 {
855 vme_unregister_driver(&vme_user_driver);
856
857 kfree(vme_user_driver.bind_table);
858 }
859
860
861 MODULE_PARM_DESC(bus, "Enumeration of VMEbus to which the driver is connected");
862 module_param_array(bus, int, &bus_num, 0);
863
864 MODULE_DESCRIPTION("VME User Space Access Driver");
865 MODULE_AUTHOR("Martyn Welch <martyn.welch@ge.com");
866 MODULE_LICENSE("GPL");
867
868 module_init(vme_user_init);
869 module_exit(vme_user_exit);
Tomato firmware and modifications.