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vme: don't open-code fixed_size_llseek()
[deliverable/linux.git] / drivers / staging / vme / devices / vme_user.c
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 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
19
20 #include <linux/cdev.h>
21 #include <linux/delay.h>
22 #include <linux/device.h>
23 #include <linux/dma-mapping.h>
24 #include <linux/errno.h>
25 #include <linux/init.h>
26 #include <linux/ioctl.h>
27 #include <linux/kernel.h>
28 #include <linux/mm.h>
29 #include <linux/module.h>
30 #include <linux/pagemap.h>
31 #include <linux/pci.h>
32 #include <linux/mutex.h>
33 #include <linux/slab.h>
34 #include <linux/spinlock.h>
35 #include <linux/syscalls.h>
36 #include <linux/types.h>
37
38 #include <linux/io.h>
39 #include <linux/uaccess.h>
40 #include <linux/vme.h>
41
42 #include "vme_user.h"
43
44 static DEFINE_MUTEX(vme_user_mutex);
45 static const char driver_name[] = "vme_user";
46
47 static int bus[VME_USER_BUS_MAX];
48 static unsigned int bus_num;
49
50 /* Currently Documentation/devices.txt defines the following for VME:
51 *
52 * 221 char VME bus
53 * 0 = /dev/bus/vme/m0 First master image
54 * 1 = /dev/bus/vme/m1 Second master image
55 * 2 = /dev/bus/vme/m2 Third master image
56 * 3 = /dev/bus/vme/m3 Fourth master image
57 * 4 = /dev/bus/vme/s0 First slave image
58 * 5 = /dev/bus/vme/s1 Second slave image
59 * 6 = /dev/bus/vme/s2 Third slave image
60 * 7 = /dev/bus/vme/s3 Fourth slave image
61 * 8 = /dev/bus/vme/ctl Control
62 *
63 * It is expected that all VME bus drivers will use the
64 * same interface. For interface documentation see
65 * http://www.vmelinux.org/.
66 *
67 * However the VME driver at http://www.vmelinux.org/ is rather old and doesn't
68 * even support the tsi148 chipset (which has 8 master and 8 slave windows).
69 * We'll run with this for now as far as possible, however it probably makes
70 * sense to get rid of the old mappings and just do everything dynamically.
71 *
72 * So for now, we'll restrict the driver to providing 4 masters and 4 slaves as
73 * defined above and try to support at least some of the interface from
74 * http://www.vmelinux.org/ as an alternative the driver can be written
75 * providing a saner interface later.
76 *
77 * The vmelinux.org driver never supported slave images, the devices reserved
78 * for slaves were repurposed to support all 8 master images on the UniverseII!
79 * We shall support 4 masters and 4 slaves with this driver.
80 */
81 #define VME_MAJOR 221 /* VME Major Device Number */
82 #define VME_DEVS 9 /* Number of dev entries */
83
84 #define MASTER_MINOR 0
85 #define MASTER_MAX 3
86 #define SLAVE_MINOR 4
87 #define SLAVE_MAX 7
88 #define CONTROL_MINOR 8
89
90 #define PCI_BUF_SIZE 0x20000 /* Size of one slave image buffer */
91
92 /*
93 * Structure to handle image related parameters.
94 */
95 struct image_desc {
96 void *kern_buf; /* Buffer address in kernel space */
97 dma_addr_t pci_buf; /* Buffer address in PCI address space */
98 unsigned long long size_buf; /* Buffer size */
99 struct mutex mutex; /* Mutex for locking image */
100 struct device *device; /* Sysfs device */
101 struct vme_resource *resource; /* VME resource */
102 int users; /* Number of current users */
103 };
104 static struct image_desc image[VME_DEVS];
105
106 struct driver_stats {
107 unsigned long reads;
108 unsigned long writes;
109 unsigned long ioctls;
110 unsigned long irqs;
111 unsigned long berrs;
112 unsigned long dmaerrors;
113 unsigned long timeouts;
114 unsigned long external;
115 };
116 static struct driver_stats statistics;
117
118 static struct cdev *vme_user_cdev; /* Character device */
119 static struct class *vme_user_sysfs_class; /* Sysfs class */
120 static struct vme_dev *vme_user_bridge; /* Pointer to user device */
121
122
123 static const int type[VME_DEVS] = { MASTER_MINOR, MASTER_MINOR,
124 MASTER_MINOR, MASTER_MINOR,
125 SLAVE_MINOR, SLAVE_MINOR,
126 SLAVE_MINOR, SLAVE_MINOR,
127 CONTROL_MINOR
128 };
129
130
131 static int vme_user_open(struct inode *, struct file *);
132 static int vme_user_release(struct inode *, struct file *);
133 static ssize_t vme_user_read(struct file *, char __user *, size_t, loff_t *);
134 static ssize_t vme_user_write(struct file *, const char __user *, size_t,
135 loff_t *);
136 static loff_t vme_user_llseek(struct file *, loff_t, int);
137 static long vme_user_unlocked_ioctl(struct file *, unsigned int, unsigned long);
138
139 static int vme_user_match(struct vme_dev *);
140 static int vme_user_probe(struct vme_dev *);
141 static int vme_user_remove(struct vme_dev *);
142
143 static const struct file_operations vme_user_fops = {
144 .open = vme_user_open,
145 .release = vme_user_release,
146 .read = vme_user_read,
147 .write = vme_user_write,
148 .llseek = vme_user_llseek,
149 .unlocked_ioctl = vme_user_unlocked_ioctl,
150 .compat_ioctl = vme_user_unlocked_ioctl,
151 };
152
153
154 /*
155 * Reset all the statistic counters
156 */
157 static void reset_counters(void)
158 {
159 statistics.reads = 0;
160 statistics.writes = 0;
161 statistics.ioctls = 0;
162 statistics.irqs = 0;
163 statistics.berrs = 0;
164 statistics.dmaerrors = 0;
165 statistics.timeouts = 0;
166 }
167
168 static int vme_user_open(struct inode *inode, struct file *file)
169 {
170 int err;
171 unsigned int minor = MINOR(inode->i_rdev);
172
173 mutex_lock(&image[minor].mutex);
174 /* Allow device to be opened if a resource is needed and allocated. */
175 if (minor < CONTROL_MINOR && image[minor].resource == NULL) {
176 pr_err("No resources allocated for device\n");
177 err = -EINVAL;
178 goto err_res;
179 }
180
181 /* Increment user count */
182 image[minor].users++;
183
184 mutex_unlock(&image[minor].mutex);
185
186 return 0;
187
188 err_res:
189 mutex_unlock(&image[minor].mutex);
190
191 return err;
192 }
193
194 static int vme_user_release(struct inode *inode, struct file *file)
195 {
196 unsigned int minor = MINOR(inode->i_rdev);
197
198 mutex_lock(&image[minor].mutex);
199
200 /* Decrement user count */
201 image[minor].users--;
202
203 mutex_unlock(&image[minor].mutex);
204
205 return 0;
206 }
207
208 /*
209 * We are going ot alloc a page during init per window for small transfers.
210 * Small transfers will go VME -> buffer -> user space. Larger (more than a
211 * page) transfers will lock the user space buffer into memory and then
212 * transfer the data directly into the user space buffers.
213 */
214 static ssize_t resource_to_user(int minor, char __user *buf, size_t count,
215 loff_t *ppos)
216 {
217 ssize_t retval;
218 ssize_t copied = 0;
219
220 if (count <= image[minor].size_buf) {
221 /* We copy to kernel buffer */
222 copied = vme_master_read(image[minor].resource,
223 image[minor].kern_buf, count, *ppos);
224 if (copied < 0)
225 return (int)copied;
226
227 retval = __copy_to_user(buf, image[minor].kern_buf,
228 (unsigned long)copied);
229 if (retval != 0) {
230 copied = (copied - retval);
231 pr_info("User copy failed\n");
232 return -EINVAL;
233 }
234
235 } else {
236 /* XXX Need to write this */
237 pr_info("Currently don't support large transfers\n");
238 /* Map in pages from userspace */
239
240 /* Call vme_master_read to do the transfer */
241 return -EINVAL;
242 }
243
244 return copied;
245 }
246
247 /*
248 * We are going to alloc a page during init per window for small transfers.
249 * Small transfers will go user space -> buffer -> VME. Larger (more than a
250 * page) transfers will lock the user space buffer into memory and then
251 * transfer the data directly from the user space buffers out to VME.
252 */
253 static ssize_t resource_from_user(unsigned int minor, const char __user *buf,
254 size_t count, loff_t *ppos)
255 {
256 ssize_t retval;
257 ssize_t copied = 0;
258
259 if (count <= image[minor].size_buf) {
260 retval = __copy_from_user(image[minor].kern_buf, buf,
261 (unsigned long)count);
262 if (retval != 0)
263 copied = (copied - retval);
264 else
265 copied = count;
266
267 copied = vme_master_write(image[minor].resource,
268 image[minor].kern_buf, copied, *ppos);
269 } else {
270 /* XXX Need to write this */
271 pr_info("Currently don't support large transfers\n");
272 /* Map in pages from userspace */
273
274 /* Call vme_master_write to do the transfer */
275 return -EINVAL;
276 }
277
278 return copied;
279 }
280
281 static ssize_t buffer_to_user(unsigned int minor, char __user *buf,
282 size_t count, loff_t *ppos)
283 {
284 void *image_ptr;
285 ssize_t retval;
286
287 image_ptr = image[minor].kern_buf + *ppos;
288
289 retval = __copy_to_user(buf, image_ptr, (unsigned long)count);
290 if (retval != 0) {
291 retval = (count - retval);
292 pr_warn("Partial copy to userspace\n");
293 } else
294 retval = count;
295
296 /* Return number of bytes successfully read */
297 return retval;
298 }
299
300 static ssize_t buffer_from_user(unsigned int minor, const char __user *buf,
301 size_t count, loff_t *ppos)
302 {
303 void *image_ptr;
304 size_t retval;
305
306 image_ptr = image[minor].kern_buf + *ppos;
307
308 retval = __copy_from_user(image_ptr, buf, (unsigned long)count);
309 if (retval != 0) {
310 retval = (count - retval);
311 pr_warn("Partial copy to userspace\n");
312 } else
313 retval = count;
314
315 /* Return number of bytes successfully read */
316 return retval;
317 }
318
319 static ssize_t vme_user_read(struct file *file, char __user *buf, size_t count,
320 loff_t *ppos)
321 {
322 unsigned int minor = MINOR(file_inode(file)->i_rdev);
323 ssize_t retval;
324 size_t image_size;
325 size_t okcount;
326
327 if (minor == CONTROL_MINOR)
328 return 0;
329
330 mutex_lock(&image[minor].mutex);
331
332 /* XXX Do we *really* want this helper - we can use vme_*_get ? */
333 image_size = vme_get_size(image[minor].resource);
334
335 /* Ensure we are starting at a valid location */
336 if ((*ppos < 0) || (*ppos > (image_size - 1))) {
337 mutex_unlock(&image[minor].mutex);
338 return 0;
339 }
340
341 /* Ensure not reading past end of the image */
342 if (*ppos + count > image_size)
343 okcount = image_size - *ppos;
344 else
345 okcount = count;
346
347 switch (type[minor]) {
348 case MASTER_MINOR:
349 retval = resource_to_user(minor, buf, okcount, ppos);
350 break;
351 case SLAVE_MINOR:
352 retval = buffer_to_user(minor, buf, okcount, ppos);
353 break;
354 default:
355 retval = -EINVAL;
356 }
357
358 mutex_unlock(&image[minor].mutex);
359 if (retval > 0)
360 *ppos += retval;
361
362 return retval;
363 }
364
365 static ssize_t vme_user_write(struct file *file, const char __user *buf,
366 size_t count, loff_t *ppos)
367 {
368 unsigned int minor = MINOR(file_inode(file)->i_rdev);
369 ssize_t retval;
370 size_t image_size;
371 size_t okcount;
372
373 if (minor == CONTROL_MINOR)
374 return 0;
375
376 mutex_lock(&image[minor].mutex);
377
378 image_size = vme_get_size(image[minor].resource);
379
380 /* Ensure we are starting at a valid location */
381 if ((*ppos < 0) || (*ppos > (image_size - 1))) {
382 mutex_unlock(&image[minor].mutex);
383 return 0;
384 }
385
386 /* Ensure not reading past end of the image */
387 if (*ppos + count > image_size)
388 okcount = image_size - *ppos;
389 else
390 okcount = count;
391
392 switch (type[minor]) {
393 case MASTER_MINOR:
394 retval = resource_from_user(minor, buf, okcount, ppos);
395 break;
396 case SLAVE_MINOR:
397 retval = buffer_from_user(minor, buf, okcount, ppos);
398 break;
399 default:
400 retval = -EINVAL;
401 }
402
403 mutex_unlock(&image[minor].mutex);
404
405 if (retval > 0)
406 *ppos += retval;
407
408 return retval;
409 }
410
411 static loff_t vme_user_llseek(struct file *file, loff_t off, int whence)
412 {
413 unsigned int minor = MINOR(file_inode(file)->i_rdev);
414 size_t image_size;
415 loff_t res;
416
417 if (minor == CONTROL_MINOR)
418 return -EINVAL;
419
420 mutex_lock(&image[minor].mutex);
421 image_size = vme_get_size(image[minor].resource);
422 res = fixed_size_llseek(file, off, whence, image_size);
423 mutex_unlock(&image[minor].mutex);
424
425 return res;
426 }
427
428 /*
429 * The ioctls provided by the old VME access method (the one at vmelinux.org)
430 * are most certainly wrong as the effectively push the registers layout
431 * through to user space. Given that the VME core can handle multiple bridges,
432 * with different register layouts this is most certainly not the way to go.
433 *
434 * We aren't using the structures defined in the Motorola driver either - these
435 * are also quite low level, however we should use the definitions that have
436 * already been defined.
437 */
438 static int vme_user_ioctl(struct inode *inode, struct file *file,
439 unsigned int cmd, unsigned long arg)
440 {
441 struct vme_master master;
442 struct vme_slave slave;
443 struct vme_irq_id irq_req;
444 unsigned long copied;
445 unsigned int minor = MINOR(inode->i_rdev);
446 int retval;
447 dma_addr_t pci_addr;
448 void __user *argp = (void __user *)arg;
449
450 statistics.ioctls++;
451
452 switch (type[minor]) {
453 case CONTROL_MINOR:
454 switch (cmd) {
455 case VME_IRQ_GEN:
456 copied = copy_from_user(&irq_req, argp,
457 sizeof(struct vme_irq_id));
458 if (copied != 0) {
459 pr_warn("Partial copy from userspace\n");
460 return -EFAULT;
461 }
462
463 retval = vme_irq_generate(vme_user_bridge,
464 irq_req.level,
465 irq_req.statid);
466
467 return retval;
468 }
469 break;
470 case MASTER_MINOR:
471 switch (cmd) {
472 case VME_GET_MASTER:
473 memset(&master, 0, sizeof(struct vme_master));
474
475 /* XXX We do not want to push aspace, cycle and width
476 * to userspace as they are
477 */
478 retval = vme_master_get(image[minor].resource,
479 &master.enable, &master.vme_addr,
480 &master.size, &master.aspace,
481 &master.cycle, &master.dwidth);
482
483 copied = copy_to_user(argp, &master,
484 sizeof(struct vme_master));
485 if (copied != 0) {
486 pr_warn("Partial copy to userspace\n");
487 return -EFAULT;
488 }
489
490 return retval;
491
492 case VME_SET_MASTER:
493
494 copied = copy_from_user(&master, argp, sizeof(master));
495 if (copied != 0) {
496 pr_warn("Partial copy from userspace\n");
497 return -EFAULT;
498 }
499
500 /* XXX We do not want to push aspace, cycle and width
501 * to userspace as they are
502 */
503 return vme_master_set(image[minor].resource,
504 master.enable, master.vme_addr, master.size,
505 master.aspace, master.cycle, master.dwidth);
506
507 break;
508 }
509 break;
510 case SLAVE_MINOR:
511 switch (cmd) {
512 case VME_GET_SLAVE:
513 memset(&slave, 0, sizeof(struct vme_slave));
514
515 /* XXX We do not want to push aspace, cycle and width
516 * to userspace as they are
517 */
518 retval = vme_slave_get(image[minor].resource,
519 &slave.enable, &slave.vme_addr,
520 &slave.size, &pci_addr, &slave.aspace,
521 &slave.cycle);
522
523 copied = copy_to_user(argp, &slave,
524 sizeof(struct vme_slave));
525 if (copied != 0) {
526 pr_warn("Partial copy to userspace\n");
527 return -EFAULT;
528 }
529
530 return retval;
531
532 case VME_SET_SLAVE:
533
534 copied = copy_from_user(&slave, argp, sizeof(slave));
535 if (copied != 0) {
536 pr_warn("Partial copy from userspace\n");
537 return -EFAULT;
538 }
539
540 /* XXX We do not want to push aspace, cycle and width
541 * to userspace as they are
542 */
543 return vme_slave_set(image[minor].resource,
544 slave.enable, slave.vme_addr, slave.size,
545 image[minor].pci_buf, slave.aspace,
546 slave.cycle);
547
548 break;
549 }
550 break;
551 }
552
553 return -EINVAL;
554 }
555
556 static long
557 vme_user_unlocked_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
558 {
559 int ret;
560
561 mutex_lock(&vme_user_mutex);
562 ret = vme_user_ioctl(file_inode(file), file, cmd, arg);
563 mutex_unlock(&vme_user_mutex);
564
565 return ret;
566 }
567
568
569 /*
570 * Unallocate a previously allocated buffer
571 */
572 static void buf_unalloc(int num)
573 {
574 if (image[num].kern_buf) {
575 #ifdef VME_DEBUG
576 pr_debug("UniverseII:Releasing buffer at %p\n",
577 image[num].pci_buf);
578 #endif
579
580 vme_free_consistent(image[num].resource, image[num].size_buf,
581 image[num].kern_buf, image[num].pci_buf);
582
583 image[num].kern_buf = NULL;
584 image[num].pci_buf = 0;
585 image[num].size_buf = 0;
586
587 #ifdef VME_DEBUG
588 } else {
589 pr_debug("UniverseII: Buffer not allocated\n");
590 #endif
591 }
592 }
593
594 static struct vme_driver vme_user_driver = {
595 .name = driver_name,
596 .match = vme_user_match,
597 .probe = vme_user_probe,
598 .remove = vme_user_remove,
599 };
600
601
602 static int __init vme_user_init(void)
603 {
604 int retval = 0;
605
606 pr_info("VME User Space Access Driver\n");
607
608 if (bus_num == 0) {
609 pr_err("No cards, skipping registration\n");
610 retval = -ENODEV;
611 goto err_nocard;
612 }
613
614 /* Let's start by supporting one bus, we can support more than one
615 * in future revisions if that ever becomes necessary.
616 */
617 if (bus_num > VME_USER_BUS_MAX) {
618 pr_err("Driver only able to handle %d buses\n",
619 VME_USER_BUS_MAX);
620 bus_num = VME_USER_BUS_MAX;
621 }
622
623 /*
624 * Here we just register the maximum number of devices we can and
625 * leave vme_user_match() to allow only 1 to go through to probe().
626 * This way, if we later want to allow multiple user access devices,
627 * we just change the code in vme_user_match().
628 */
629 retval = vme_register_driver(&vme_user_driver, VME_MAX_SLOTS);
630 if (retval != 0)
631 goto err_reg;
632
633 return retval;
634
635 err_reg:
636 err_nocard:
637 return retval;
638 }
639
640 static int vme_user_match(struct vme_dev *vdev)
641 {
642 int i;
643
644 int cur_bus = vme_bus_num(vdev);
645 int cur_slot = vme_slot_num(vdev);
646
647 for (i = 0; i < bus_num; i++)
648 if ((cur_bus == bus[i]) && (cur_slot == vdev->num))
649 return 1;
650
651 return 0;
652 }
653
654 /*
655 * In this simple access driver, the old behaviour is being preserved as much
656 * as practical. We will therefore reserve the buffers and request the images
657 * here so that we don't have to do it later.
658 */
659 static int vme_user_probe(struct vme_dev *vdev)
660 {
661 int i, err;
662 char *name;
663
664 /* Save pointer to the bridge device */
665 if (vme_user_bridge != NULL) {
666 dev_err(&vdev->dev, "Driver can only be loaded for 1 device\n");
667 err = -EINVAL;
668 goto err_dev;
669 }
670 vme_user_bridge = vdev;
671
672 /* Initialise descriptors */
673 for (i = 0; i < VME_DEVS; i++) {
674 image[i].kern_buf = NULL;
675 image[i].pci_buf = 0;
676 mutex_init(&image[i].mutex);
677 image[i].device = NULL;
678 image[i].resource = NULL;
679 image[i].users = 0;
680 }
681
682 /* Initialise statistics counters */
683 reset_counters();
684
685 /* Assign major and minor numbers for the driver */
686 err = register_chrdev_region(MKDEV(VME_MAJOR, 0), VME_DEVS,
687 driver_name);
688 if (err) {
689 dev_warn(&vdev->dev, "Error getting Major Number %d for driver.\n",
690 VME_MAJOR);
691 goto err_region;
692 }
693
694 /* Register the driver as a char device */
695 vme_user_cdev = cdev_alloc();
696 if (!vme_user_cdev) {
697 err = -ENOMEM;
698 goto err_char;
699 }
700 vme_user_cdev->ops = &vme_user_fops;
701 vme_user_cdev->owner = THIS_MODULE;
702 err = cdev_add(vme_user_cdev, MKDEV(VME_MAJOR, 0), VME_DEVS);
703 if (err) {
704 dev_warn(&vdev->dev, "cdev_all failed\n");
705 goto err_char;
706 }
707
708 /* Request slave resources and allocate buffers (128kB wide) */
709 for (i = SLAVE_MINOR; i < (SLAVE_MAX + 1); i++) {
710 /* XXX Need to properly request attributes */
711 /* For ca91cx42 bridge there are only two slave windows
712 * supporting A16 addressing, so we request A24 supported
713 * by all windows.
714 */
715 image[i].resource = vme_slave_request(vme_user_bridge,
716 VME_A24, VME_SCT);
717 if (image[i].resource == NULL) {
718 dev_warn(&vdev->dev,
719 "Unable to allocate slave resource\n");
720 err = -ENOMEM;
721 goto err_slave;
722 }
723 image[i].size_buf = PCI_BUF_SIZE;
724 image[i].kern_buf = vme_alloc_consistent(image[i].resource,
725 image[i].size_buf, &image[i].pci_buf);
726 if (image[i].kern_buf == NULL) {
727 dev_warn(&vdev->dev,
728 "Unable to allocate memory for buffer\n");
729 image[i].pci_buf = 0;
730 vme_slave_free(image[i].resource);
731 err = -ENOMEM;
732 goto err_slave;
733 }
734 }
735
736 /*
737 * Request master resources allocate page sized buffers for small
738 * reads and writes
739 */
740 for (i = MASTER_MINOR; i < (MASTER_MAX + 1); i++) {
741 /* XXX Need to properly request attributes */
742 image[i].resource = vme_master_request(vme_user_bridge,
743 VME_A32, VME_SCT, VME_D32);
744 if (image[i].resource == NULL) {
745 dev_warn(&vdev->dev,
746 "Unable to allocate master resource\n");
747 err = -ENOMEM;
748 goto err_master;
749 }
750 image[i].size_buf = PCI_BUF_SIZE;
751 image[i].kern_buf = kmalloc(image[i].size_buf, GFP_KERNEL);
752 if (image[i].kern_buf == NULL) {
753 err = -ENOMEM;
754 vme_master_free(image[i].resource);
755 goto err_master;
756 }
757 }
758
759 /* Create sysfs entries - on udev systems this creates the dev files */
760 vme_user_sysfs_class = class_create(THIS_MODULE, driver_name);
761 if (IS_ERR(vme_user_sysfs_class)) {
762 dev_err(&vdev->dev, "Error creating vme_user class.\n");
763 err = PTR_ERR(vme_user_sysfs_class);
764 goto err_class;
765 }
766
767 /* Add sysfs Entries */
768 for (i = 0; i < VME_DEVS; i++) {
769 int num;
770
771 switch (type[i]) {
772 case MASTER_MINOR:
773 name = "bus/vme/m%d";
774 break;
775 case CONTROL_MINOR:
776 name = "bus/vme/ctl";
777 break;
778 case SLAVE_MINOR:
779 name = "bus/vme/s%d";
780 break;
781 default:
782 err = -EINVAL;
783 goto err_sysfs;
784 }
785
786 num = (type[i] == SLAVE_MINOR) ? i - (MASTER_MAX + 1) : i;
787 image[i].device = device_create(vme_user_sysfs_class, NULL,
788 MKDEV(VME_MAJOR, i), NULL, name, num);
789 if (IS_ERR(image[i].device)) {
790 dev_info(&vdev->dev, "Error creating sysfs device\n");
791 err = PTR_ERR(image[i].device);
792 goto err_sysfs;
793 }
794 }
795
796 return 0;
797
798 err_sysfs:
799 while (i > 0) {
800 i--;
801 device_destroy(vme_user_sysfs_class, MKDEV(VME_MAJOR, i));
802 }
803 class_destroy(vme_user_sysfs_class);
804
805 /* Ensure counter set correcty to unalloc all master windows */
806 i = MASTER_MAX + 1;
807 err_master:
808 while (i > MASTER_MINOR) {
809 i--;
810 kfree(image[i].kern_buf);
811 vme_master_free(image[i].resource);
812 }
813
814 /*
815 * Ensure counter set correcty to unalloc all slave windows and buffers
816 */
817 i = SLAVE_MAX + 1;
818 err_slave:
819 while (i > SLAVE_MINOR) {
820 i--;
821 buf_unalloc(i);
822 vme_slave_free(image[i].resource);
823 }
824 err_class:
825 cdev_del(vme_user_cdev);
826 err_char:
827 unregister_chrdev_region(MKDEV(VME_MAJOR, 0), VME_DEVS);
828 err_region:
829 err_dev:
830 return err;
831 }
832
833 static int vme_user_remove(struct vme_dev *dev)
834 {
835 int i;
836
837 /* Remove sysfs Entries */
838 for (i = 0; i < VME_DEVS; i++) {
839 mutex_destroy(&image[i].mutex);
840 device_destroy(vme_user_sysfs_class, MKDEV(VME_MAJOR, i));
841 }
842 class_destroy(vme_user_sysfs_class);
843
844 for (i = MASTER_MINOR; i < (MASTER_MAX + 1); i++) {
845 kfree(image[i].kern_buf);
846 vme_master_free(image[i].resource);
847 }
848
849 for (i = SLAVE_MINOR; i < (SLAVE_MAX + 1); i++) {
850 vme_slave_set(image[i].resource, 0, 0, 0, 0, VME_A32, 0);
851 buf_unalloc(i);
852 vme_slave_free(image[i].resource);
853 }
854
855 /* Unregister device driver */
856 cdev_del(vme_user_cdev);
857
858 /* Unregiser the major and minor device numbers */
859 unregister_chrdev_region(MKDEV(VME_MAJOR, 0), VME_DEVS);
860
861 return 0;
862 }
863
864 static void __exit vme_user_exit(void)
865 {
866 vme_unregister_driver(&vme_user_driver);
867 }
868
869
870 MODULE_PARM_DESC(bus, "Enumeration of VMEbus to which the driver is connected");
871 module_param_array(bus, int, &bus_num, 0);
872
873 MODULE_DESCRIPTION("VME User Space Access Driver");
874 MODULE_AUTHOR("Martyn Welch <martyn.welch@ge.com");
875 MODULE_LICENSE("GPL");
876
877 module_init(vme_user_init);
878 module_exit(vme_user_exit);
Linux kernel - Deliverables
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