1 | // SPDX-License-Identifier: GPL-2.0+ |
2 | /* |
3 | * VMEbus User access driver |
4 | * |
5 | * Author: Martyn Welch <martyn.welch@ge.com> |
6 | * Copyright 2008 GE Intelligent Platforms Embedded Systems, Inc. |
7 | * |
8 | * Based on work by: |
9 | * Tom Armistead and Ajit Prem |
10 | * Copyright 2004 Motorola Inc. |
11 | */ |
12 | |
13 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
14 | |
15 | #include <linux/refcount.h> |
16 | #include <linux/cdev.h> |
17 | #include <linux/delay.h> |
18 | #include <linux/device.h> |
19 | #include <linux/dma-mapping.h> |
20 | #include <linux/errno.h> |
21 | #include <linux/init.h> |
22 | #include <linux/ioctl.h> |
23 | #include <linux/kernel.h> |
24 | #include <linux/mm.h> |
25 | #include <linux/module.h> |
26 | #include <linux/pagemap.h> |
27 | #include <linux/pci.h> |
28 | #include <linux/mutex.h> |
29 | #include <linux/slab.h> |
30 | #include <linux/spinlock.h> |
31 | #include <linux/syscalls.h> |
32 | #include <linux/types.h> |
33 | |
34 | #include <linux/io.h> |
35 | #include <linux/uaccess.h> |
36 | |
37 | #include "vme.h" |
38 | #include "vme_user.h" |
39 | |
40 | #define DRIVER_NAME "vme_user" |
41 | |
42 | static int bus[VME_USER_BUS_MAX]; |
43 | static unsigned int bus_num; |
44 | |
45 | /* Currently Documentation/admin-guide/devices.rst defines the |
46 | * following for VME: |
47 | * |
48 | * 221 char VME bus |
49 | * 0 = /dev/bus/vme/m0 First master image |
50 | * 1 = /dev/bus/vme/m1 Second master image |
51 | * 2 = /dev/bus/vme/m2 Third master image |
52 | * 3 = /dev/bus/vme/m3 Fourth master image |
53 | * 4 = /dev/bus/vme/s0 First slave image |
54 | * 5 = /dev/bus/vme/s1 Second slave image |
55 | * 6 = /dev/bus/vme/s2 Third slave image |
56 | * 7 = /dev/bus/vme/s3 Fourth slave image |
57 | * 8 = /dev/bus/vme/ctl Control |
58 | * |
59 | * It is expected that all VME bus drivers will use the |
60 | * same interface. For interface documentation see |
61 | * http://www.vmelinux.org/. |
62 | * |
63 | * However the VME driver at http://www.vmelinux.org/ is rather old and doesn't |
64 | * even support the tsi148 chipset (which has 8 master and 8 slave windows). |
65 | * We'll run with this for now as far as possible, however it probably makes |
66 | * sense to get rid of the old mappings and just do everything dynamically. |
67 | * |
68 | * So for now, we'll restrict the driver to providing 4 masters and 4 slaves as |
69 | * defined above and try to support at least some of the interface from |
70 | * http://www.vmelinux.org/ as an alternative the driver can be written |
71 | * providing a saner interface later. |
72 | * |
73 | * The vmelinux.org driver never supported slave images, the devices reserved |
74 | * for slaves were repurposed to support all 8 master images on the UniverseII! |
75 | * We shall support 4 masters and 4 slaves with this driver. |
76 | */ |
77 | #define VME_MAJOR 221 /* VME Major Device Number */ |
78 | #define VME_DEVS 9 /* Number of dev entries */ |
79 | |
80 | #define MASTER_MINOR 0 |
81 | #define MASTER_MAX 3 |
82 | #define SLAVE_MINOR 4 |
83 | #define SLAVE_MAX 7 |
84 | #define CONTROL_MINOR 8 |
85 | |
86 | #define PCI_BUF_SIZE 0x20000 /* Size of one slave image buffer */ |
87 | |
88 | /* |
89 | * Structure to handle image related parameters. |
90 | */ |
91 | struct image_desc { |
92 | void *kern_buf; /* Buffer address in kernel space */ |
93 | dma_addr_t pci_buf; /* Buffer address in PCI address space */ |
94 | unsigned long long size_buf; /* Buffer size */ |
95 | struct mutex mutex; /* Mutex for locking image */ |
96 | struct device *device; /* Sysfs device */ |
97 | struct vme_resource *resource; /* VME resource */ |
98 | int mmap_count; /* Number of current mmap's */ |
99 | }; |
100 | |
101 | static struct image_desc image[VME_DEVS]; |
102 | |
103 | static struct cdev *vme_user_cdev; /* Character device */ |
104 | static struct vme_dev *vme_user_bridge; /* Pointer to user device */ |
105 | |
106 | static const struct class vme_user_sysfs_class = { |
107 | .name = DRIVER_NAME, |
108 | }; |
109 | static const int type[VME_DEVS] = { MASTER_MINOR, MASTER_MINOR, |
110 | MASTER_MINOR, MASTER_MINOR, |
111 | SLAVE_MINOR, SLAVE_MINOR, |
112 | SLAVE_MINOR, SLAVE_MINOR, |
113 | CONTROL_MINOR |
114 | }; |
115 | |
116 | struct vme_user_vma_priv { |
117 | unsigned int minor; |
118 | refcount_t refcnt; |
119 | }; |
120 | |
121 | static ssize_t resource_to_user(int minor, char __user *buf, size_t count, |
122 | loff_t *ppos) |
123 | { |
124 | ssize_t copied = 0; |
125 | |
126 | if (count > image[minor].size_buf) |
127 | count = image[minor].size_buf; |
128 | |
129 | copied = vme_master_read(image[minor].resource, image[minor].kern_buf, |
130 | count, *ppos); |
131 | if (copied < 0) |
132 | return (int)copied; |
133 | |
134 | if (copy_to_user(to: buf, from: image[minor].kern_buf, n: (unsigned long)copied)) |
135 | return -EFAULT; |
136 | |
137 | return copied; |
138 | } |
139 | |
140 | static ssize_t resource_from_user(unsigned int minor, const char __user *buf, |
141 | size_t count, loff_t *ppos) |
142 | { |
143 | if (count > image[minor].size_buf) |
144 | count = image[minor].size_buf; |
145 | |
146 | if (copy_from_user(to: image[minor].kern_buf, from: buf, n: (unsigned long)count)) |
147 | return -EFAULT; |
148 | |
149 | return vme_master_write(image[minor].resource, image[minor].kern_buf, |
150 | count, *ppos); |
151 | } |
152 | |
153 | static ssize_t buffer_to_user(unsigned int minor, char __user *buf, |
154 | size_t count, loff_t *ppos) |
155 | { |
156 | void *image_ptr; |
157 | |
158 | image_ptr = image[minor].kern_buf + *ppos; |
159 | if (copy_to_user(to: buf, from: image_ptr, n: (unsigned long)count)) |
160 | return -EFAULT; |
161 | |
162 | return count; |
163 | } |
164 | |
165 | static ssize_t buffer_from_user(unsigned int minor, const char __user *buf, |
166 | size_t count, loff_t *ppos) |
167 | { |
168 | void *image_ptr; |
169 | |
170 | image_ptr = image[minor].kern_buf + *ppos; |
171 | if (copy_from_user(to: image_ptr, from: buf, n: (unsigned long)count)) |
172 | return -EFAULT; |
173 | |
174 | return count; |
175 | } |
176 | |
177 | static ssize_t vme_user_read(struct file *file, char __user *buf, size_t count, |
178 | loff_t *ppos) |
179 | { |
180 | unsigned int minor = iminor(inode: file_inode(f: file)); |
181 | ssize_t retval; |
182 | size_t image_size; |
183 | |
184 | if (minor == CONTROL_MINOR) |
185 | return 0; |
186 | |
187 | mutex_lock(&image[minor].mutex); |
188 | |
189 | /* XXX Do we *really* want this helper - we can use vme_*_get ? */ |
190 | image_size = vme_get_size(image[minor].resource); |
191 | |
192 | /* Ensure we are starting at a valid location */ |
193 | if ((*ppos < 0) || (*ppos > (image_size - 1))) { |
194 | mutex_unlock(lock: &image[minor].mutex); |
195 | return 0; |
196 | } |
197 | |
198 | /* Ensure not reading past end of the image */ |
199 | if (*ppos + count > image_size) |
200 | count = image_size - *ppos; |
201 | |
202 | switch (type[minor]) { |
203 | case MASTER_MINOR: |
204 | retval = resource_to_user(minor, buf, count, ppos); |
205 | break; |
206 | case SLAVE_MINOR: |
207 | retval = buffer_to_user(minor, buf, count, ppos); |
208 | break; |
209 | default: |
210 | retval = -EINVAL; |
211 | } |
212 | |
213 | mutex_unlock(lock: &image[minor].mutex); |
214 | if (retval > 0) |
215 | *ppos += retval; |
216 | |
217 | return retval; |
218 | } |
219 | |
220 | static ssize_t vme_user_write(struct file *file, const char __user *buf, |
221 | size_t count, loff_t *ppos) |
222 | { |
223 | unsigned int minor = iminor(inode: file_inode(f: file)); |
224 | ssize_t retval; |
225 | size_t image_size; |
226 | |
227 | if (minor == CONTROL_MINOR) |
228 | return 0; |
229 | |
230 | mutex_lock(&image[minor].mutex); |
231 | |
232 | image_size = vme_get_size(image[minor].resource); |
233 | |
234 | /* Ensure we are starting at a valid location */ |
235 | if ((*ppos < 0) || (*ppos > (image_size - 1))) { |
236 | mutex_unlock(lock: &image[minor].mutex); |
237 | return 0; |
238 | } |
239 | |
240 | /* Ensure not reading past end of the image */ |
241 | if (*ppos + count > image_size) |
242 | count = image_size - *ppos; |
243 | |
244 | switch (type[minor]) { |
245 | case MASTER_MINOR: |
246 | retval = resource_from_user(minor, buf, count, ppos); |
247 | break; |
248 | case SLAVE_MINOR: |
249 | retval = buffer_from_user(minor, buf, count, ppos); |
250 | break; |
251 | default: |
252 | retval = -EINVAL; |
253 | } |
254 | |
255 | mutex_unlock(lock: &image[minor].mutex); |
256 | |
257 | if (retval > 0) |
258 | *ppos += retval; |
259 | |
260 | return retval; |
261 | } |
262 | |
263 | static loff_t vme_user_llseek(struct file *file, loff_t off, int whence) |
264 | { |
265 | unsigned int minor = iminor(inode: file_inode(f: file)); |
266 | size_t image_size; |
267 | loff_t res; |
268 | |
269 | switch (type[minor]) { |
270 | case MASTER_MINOR: |
271 | case SLAVE_MINOR: |
272 | mutex_lock(&image[minor].mutex); |
273 | image_size = vme_get_size(image[minor].resource); |
274 | res = fixed_size_llseek(file, offset: off, whence, size: image_size); |
275 | mutex_unlock(lock: &image[minor].mutex); |
276 | return res; |
277 | } |
278 | |
279 | return -EINVAL; |
280 | } |
281 | |
282 | /* |
283 | * The ioctls provided by the old VME access method (the one at vmelinux.org) |
284 | * are most certainly wrong as the effectively push the registers layout |
285 | * through to user space. Given that the VME core can handle multiple bridges, |
286 | * with different register layouts this is most certainly not the way to go. |
287 | * |
288 | * We aren't using the structures defined in the Motorola driver either - these |
289 | * are also quite low level, however we should use the definitions that have |
290 | * already been defined. |
291 | */ |
292 | static int vme_user_ioctl(struct inode *inode, struct file *file, |
293 | unsigned int cmd, unsigned long arg) |
294 | { |
295 | struct vme_master master; |
296 | struct vme_slave slave; |
297 | struct vme_irq_id irq_req; |
298 | unsigned long copied; |
299 | unsigned int minor = iminor(inode); |
300 | int retval; |
301 | dma_addr_t pci_addr; |
302 | void __user *argp = (void __user *)arg; |
303 | |
304 | switch (type[minor]) { |
305 | case CONTROL_MINOR: |
306 | switch (cmd) { |
307 | case VME_IRQ_GEN: |
308 | copied = copy_from_user(to: &irq_req, from: argp, |
309 | n: sizeof(irq_req)); |
310 | if (copied) { |
311 | pr_warn("Partial copy from userspace\n" ); |
312 | return -EFAULT; |
313 | } |
314 | |
315 | return vme_irq_generate(vme_user_bridge, |
316 | irq_req.level, |
317 | irq_req.statid); |
318 | } |
319 | break; |
320 | case MASTER_MINOR: |
321 | switch (cmd) { |
322 | case VME_GET_MASTER: |
323 | memset(&master, 0, sizeof(master)); |
324 | |
325 | /* XXX We do not want to push aspace, cycle and width |
326 | * to userspace as they are |
327 | */ |
328 | retval = vme_master_get(image[minor].resource, |
329 | &master.enable, |
330 | &master.vme_addr, |
331 | &master.size, &master.aspace, |
332 | &master.cycle, &master.dwidth); |
333 | |
334 | copied = copy_to_user(to: argp, from: &master, |
335 | n: sizeof(master)); |
336 | if (copied) { |
337 | pr_warn("Partial copy to userspace\n" ); |
338 | return -EFAULT; |
339 | } |
340 | |
341 | return retval; |
342 | |
343 | case VME_SET_MASTER: |
344 | |
345 | if (image[minor].mmap_count != 0) { |
346 | pr_warn("Can't adjust mapped window\n" ); |
347 | return -EPERM; |
348 | } |
349 | |
350 | copied = copy_from_user(to: &master, from: argp, n: sizeof(master)); |
351 | if (copied) { |
352 | pr_warn("Partial copy from userspace\n" ); |
353 | return -EFAULT; |
354 | } |
355 | |
356 | /* XXX We do not want to push aspace, cycle and width |
357 | * to userspace as they are |
358 | */ |
359 | return vme_master_set(image[minor].resource, |
360 | master.enable, master.vme_addr, master.size, |
361 | master.aspace, master.cycle, master.dwidth); |
362 | |
363 | break; |
364 | } |
365 | break; |
366 | case SLAVE_MINOR: |
367 | switch (cmd) { |
368 | case VME_GET_SLAVE: |
369 | memset(&slave, 0, sizeof(slave)); |
370 | |
371 | /* XXX We do not want to push aspace, cycle and width |
372 | * to userspace as they are |
373 | */ |
374 | retval = vme_slave_get(image[minor].resource, |
375 | &slave.enable, &slave.vme_addr, |
376 | &slave.size, &pci_addr, |
377 | &slave.aspace, &slave.cycle); |
378 | |
379 | copied = copy_to_user(to: argp, from: &slave, |
380 | n: sizeof(slave)); |
381 | if (copied) { |
382 | pr_warn("Partial copy to userspace\n" ); |
383 | return -EFAULT; |
384 | } |
385 | |
386 | return retval; |
387 | |
388 | case VME_SET_SLAVE: |
389 | |
390 | copied = copy_from_user(to: &slave, from: argp, n: sizeof(slave)); |
391 | if (copied) { |
392 | pr_warn("Partial copy from userspace\n" ); |
393 | return -EFAULT; |
394 | } |
395 | |
396 | /* XXX We do not want to push aspace, cycle and width |
397 | * to userspace as they are |
398 | */ |
399 | return vme_slave_set(image[minor].resource, |
400 | slave.enable, slave.vme_addr, slave.size, |
401 | image[minor].pci_buf, slave.aspace, |
402 | slave.cycle); |
403 | |
404 | break; |
405 | } |
406 | break; |
407 | } |
408 | |
409 | return -EINVAL; |
410 | } |
411 | |
412 | static long |
413 | vme_user_unlocked_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
414 | { |
415 | int ret; |
416 | struct inode *inode = file_inode(f: file); |
417 | unsigned int minor = iminor(inode); |
418 | |
419 | mutex_lock(&image[minor].mutex); |
420 | ret = vme_user_ioctl(inode, file, cmd, arg); |
421 | mutex_unlock(lock: &image[minor].mutex); |
422 | |
423 | return ret; |
424 | } |
425 | |
426 | static void vme_user_vm_open(struct vm_area_struct *vma) |
427 | { |
428 | struct vme_user_vma_priv *vma_priv = vma->vm_private_data; |
429 | |
430 | refcount_inc(r: &vma_priv->refcnt); |
431 | } |
432 | |
433 | static void vme_user_vm_close(struct vm_area_struct *vma) |
434 | { |
435 | struct vme_user_vma_priv *vma_priv = vma->vm_private_data; |
436 | unsigned int minor = vma_priv->minor; |
437 | |
438 | if (!refcount_dec_and_test(r: &vma_priv->refcnt)) |
439 | return; |
440 | |
441 | mutex_lock(&image[minor].mutex); |
442 | image[minor].mmap_count--; |
443 | mutex_unlock(lock: &image[minor].mutex); |
444 | |
445 | kfree(objp: vma_priv); |
446 | } |
447 | |
448 | static const struct vm_operations_struct vme_user_vm_ops = { |
449 | .open = vme_user_vm_open, |
450 | .close = vme_user_vm_close, |
451 | }; |
452 | |
453 | static int vme_user_master_mmap(unsigned int minor, struct vm_area_struct *vma) |
454 | { |
455 | int err; |
456 | struct vme_user_vma_priv *vma_priv; |
457 | |
458 | mutex_lock(&image[minor].mutex); |
459 | |
460 | err = vme_master_mmap(resource: image[minor].resource, vma); |
461 | if (err) { |
462 | mutex_unlock(lock: &image[minor].mutex); |
463 | return err; |
464 | } |
465 | |
466 | vma_priv = kmalloc(size: sizeof(*vma_priv), GFP_KERNEL); |
467 | if (!vma_priv) { |
468 | mutex_unlock(lock: &image[minor].mutex); |
469 | return -ENOMEM; |
470 | } |
471 | |
472 | vma_priv->minor = minor; |
473 | refcount_set(r: &vma_priv->refcnt, n: 1); |
474 | vma->vm_ops = &vme_user_vm_ops; |
475 | vma->vm_private_data = vma_priv; |
476 | |
477 | image[minor].mmap_count++; |
478 | |
479 | mutex_unlock(lock: &image[minor].mutex); |
480 | |
481 | return 0; |
482 | } |
483 | |
484 | static int vme_user_mmap(struct file *file, struct vm_area_struct *vma) |
485 | { |
486 | unsigned int minor = iminor(inode: file_inode(f: file)); |
487 | |
488 | if (type[minor] == MASTER_MINOR) |
489 | return vme_user_master_mmap(minor, vma); |
490 | |
491 | return -ENODEV; |
492 | } |
493 | |
494 | static const struct file_operations vme_user_fops = { |
495 | .read = vme_user_read, |
496 | .write = vme_user_write, |
497 | .llseek = vme_user_llseek, |
498 | .unlocked_ioctl = vme_user_unlocked_ioctl, |
499 | .compat_ioctl = compat_ptr_ioctl, |
500 | .mmap = vme_user_mmap, |
501 | }; |
502 | |
503 | static int vme_user_match(struct vme_dev *vdev) |
504 | { |
505 | int i; |
506 | |
507 | int cur_bus = vme_bus_num(vdev); |
508 | int cur_slot = vme_slot_num(vdev); |
509 | |
510 | for (i = 0; i < bus_num; i++) |
511 | if ((cur_bus == bus[i]) && (cur_slot == vdev->num)) |
512 | return 1; |
513 | |
514 | return 0; |
515 | } |
516 | |
517 | /* |
518 | * In this simple access driver, the old behaviour is being preserved as much |
519 | * as practical. We will therefore reserve the buffers and request the images |
520 | * here so that we don't have to do it later. |
521 | */ |
522 | static int vme_user_probe(struct vme_dev *vdev) |
523 | { |
524 | int i, err; |
525 | char *name; |
526 | |
527 | /* Save pointer to the bridge device */ |
528 | if (vme_user_bridge) { |
529 | dev_err(&vdev->dev, "Driver can only be loaded for 1 device\n" ); |
530 | err = -EINVAL; |
531 | goto err_dev; |
532 | } |
533 | vme_user_bridge = vdev; |
534 | |
535 | /* Initialise descriptors */ |
536 | for (i = 0; i < VME_DEVS; i++) { |
537 | image[i].kern_buf = NULL; |
538 | image[i].pci_buf = 0; |
539 | mutex_init(&image[i].mutex); |
540 | image[i].device = NULL; |
541 | image[i].resource = NULL; |
542 | } |
543 | |
544 | /* Assign major and minor numbers for the driver */ |
545 | err = register_chrdev_region(MKDEV(VME_MAJOR, 0), VME_DEVS, DRIVER_NAME); |
546 | if (err) { |
547 | dev_warn(&vdev->dev, "Error getting Major Number %d for driver.\n" , |
548 | VME_MAJOR); |
549 | goto err_region; |
550 | } |
551 | |
552 | /* Register the driver as a char device */ |
553 | vme_user_cdev = cdev_alloc(); |
554 | if (!vme_user_cdev) { |
555 | err = -ENOMEM; |
556 | goto err_char; |
557 | } |
558 | vme_user_cdev->ops = &vme_user_fops; |
559 | vme_user_cdev->owner = THIS_MODULE; |
560 | err = cdev_add(vme_user_cdev, MKDEV(VME_MAJOR, 0), VME_DEVS); |
561 | if (err) |
562 | goto err_class; |
563 | |
564 | /* Request slave resources and allocate buffers (128kB wide) */ |
565 | for (i = SLAVE_MINOR; i < (SLAVE_MAX + 1); i++) { |
566 | /* XXX Need to properly request attributes */ |
567 | /* For ca91cx42 bridge there are only two slave windows |
568 | * supporting A16 addressing, so we request A24 supported |
569 | * by all windows. |
570 | */ |
571 | image[i].resource = vme_slave_request(vme_user_bridge, |
572 | VME_A24, VME_SCT); |
573 | if (!image[i].resource) { |
574 | dev_warn(&vdev->dev, |
575 | "Unable to allocate slave resource\n" ); |
576 | err = -ENOMEM; |
577 | goto err_slave; |
578 | } |
579 | image[i].size_buf = PCI_BUF_SIZE; |
580 | image[i].kern_buf = vme_alloc_consistent(image[i].resource, |
581 | image[i].size_buf, |
582 | &image[i].pci_buf); |
583 | if (!image[i].kern_buf) { |
584 | dev_warn(&vdev->dev, |
585 | "Unable to allocate memory for buffer\n" ); |
586 | image[i].pci_buf = 0; |
587 | vme_slave_free(image[i].resource); |
588 | err = -ENOMEM; |
589 | goto err_slave; |
590 | } |
591 | } |
592 | |
593 | /* |
594 | * Request master resources allocate page sized buffers for small |
595 | * reads and writes |
596 | */ |
597 | for (i = MASTER_MINOR; i < (MASTER_MAX + 1); i++) { |
598 | /* XXX Need to properly request attributes */ |
599 | image[i].resource = vme_master_request(vme_user_bridge, |
600 | VME_A32, VME_SCT, |
601 | VME_D32); |
602 | if (!image[i].resource) { |
603 | dev_warn(&vdev->dev, |
604 | "Unable to allocate master resource\n" ); |
605 | err = -ENOMEM; |
606 | goto err_master; |
607 | } |
608 | image[i].size_buf = PCI_BUF_SIZE; |
609 | image[i].kern_buf = kmalloc(size: image[i].size_buf, GFP_KERNEL); |
610 | if (!image[i].kern_buf) { |
611 | err = -ENOMEM; |
612 | vme_master_free(image[i].resource); |
613 | goto err_master; |
614 | } |
615 | } |
616 | |
617 | /* Create sysfs entries - on udev systems this creates the dev files */ |
618 | err = class_register(class: &vme_user_sysfs_class); |
619 | if (err) { |
620 | dev_err(&vdev->dev, "Error creating vme_user class.\n" ); |
621 | goto err_master; |
622 | } |
623 | |
624 | /* Add sysfs Entries */ |
625 | for (i = 0; i < VME_DEVS; i++) { |
626 | int num; |
627 | |
628 | switch (type[i]) { |
629 | case MASTER_MINOR: |
630 | name = "bus/vme/m%d" ; |
631 | break; |
632 | case CONTROL_MINOR: |
633 | name = "bus/vme/ctl" ; |
634 | break; |
635 | case SLAVE_MINOR: |
636 | name = "bus/vme/s%d" ; |
637 | break; |
638 | default: |
639 | err = -EINVAL; |
640 | goto err_sysfs; |
641 | } |
642 | |
643 | num = (type[i] == SLAVE_MINOR) ? i - (MASTER_MAX + 1) : i; |
644 | image[i].device = device_create(cls: &vme_user_sysfs_class, NULL, |
645 | MKDEV(VME_MAJOR, i), NULL, |
646 | fmt: name, num); |
647 | if (IS_ERR(ptr: image[i].device)) { |
648 | dev_info(&vdev->dev, "Error creating sysfs device\n" ); |
649 | err = PTR_ERR(ptr: image[i].device); |
650 | goto err_sysfs; |
651 | } |
652 | } |
653 | |
654 | return 0; |
655 | |
656 | err_sysfs: |
657 | while (i > 0) { |
658 | i--; |
659 | device_destroy(cls: &vme_user_sysfs_class, MKDEV(VME_MAJOR, i)); |
660 | } |
661 | class_unregister(class: &vme_user_sysfs_class); |
662 | |
663 | /* Ensure counter set correctly to unalloc all master windows */ |
664 | i = MASTER_MAX + 1; |
665 | err_master: |
666 | while (i > MASTER_MINOR) { |
667 | i--; |
668 | kfree(objp: image[i].kern_buf); |
669 | vme_master_free(image[i].resource); |
670 | } |
671 | |
672 | /* |
673 | * Ensure counter set correctly to unalloc all slave windows and buffers |
674 | */ |
675 | i = SLAVE_MAX + 1; |
676 | err_slave: |
677 | while (i > SLAVE_MINOR) { |
678 | i--; |
679 | vme_free_consistent(image[i].resource, image[i].size_buf, |
680 | image[i].kern_buf, image[i].pci_buf); |
681 | vme_slave_free(image[i].resource); |
682 | } |
683 | err_class: |
684 | cdev_del(vme_user_cdev); |
685 | err_char: |
686 | unregister_chrdev_region(MKDEV(VME_MAJOR, 0), VME_DEVS); |
687 | err_region: |
688 | err_dev: |
689 | return err; |
690 | } |
691 | |
692 | static void vme_user_remove(struct vme_dev *dev) |
693 | { |
694 | int i; |
695 | |
696 | /* Remove sysfs Entries */ |
697 | for (i = 0; i < VME_DEVS; i++) { |
698 | mutex_destroy(lock: &image[i].mutex); |
699 | device_destroy(cls: &vme_user_sysfs_class, MKDEV(VME_MAJOR, i)); |
700 | } |
701 | class_unregister(class: &vme_user_sysfs_class); |
702 | |
703 | for (i = MASTER_MINOR; i < (MASTER_MAX + 1); i++) { |
704 | kfree(objp: image[i].kern_buf); |
705 | vme_master_free(image[i].resource); |
706 | } |
707 | |
708 | for (i = SLAVE_MINOR; i < (SLAVE_MAX + 1); i++) { |
709 | vme_slave_set(image[i].resource, 0, 0, 0, 0, VME_A32, 0); |
710 | vme_free_consistent(image[i].resource, image[i].size_buf, |
711 | image[i].kern_buf, image[i].pci_buf); |
712 | vme_slave_free(image[i].resource); |
713 | } |
714 | |
715 | /* Unregister device driver */ |
716 | cdev_del(vme_user_cdev); |
717 | |
718 | /* Unregister the major and minor device numbers */ |
719 | unregister_chrdev_region(MKDEV(VME_MAJOR, 0), VME_DEVS); |
720 | } |
721 | |
722 | static struct vme_driver vme_user_driver = { |
723 | .name = DRIVER_NAME, |
724 | .match = vme_user_match, |
725 | .probe = vme_user_probe, |
726 | .remove = vme_user_remove, |
727 | }; |
728 | |
729 | static int __init vme_user_init(void) |
730 | { |
731 | int retval = 0; |
732 | |
733 | pr_info("VME User Space Access Driver\n" ); |
734 | |
735 | if (bus_num == 0) { |
736 | pr_err("No cards, skipping registration\n" ); |
737 | retval = -ENODEV; |
738 | goto err_nocard; |
739 | } |
740 | |
741 | /* Let's start by supporting one bus, we can support more than one |
742 | * in future revisions if that ever becomes necessary. |
743 | */ |
744 | if (bus_num > VME_USER_BUS_MAX) { |
745 | pr_err("Driver only able to handle %d buses\n" , |
746 | VME_USER_BUS_MAX); |
747 | bus_num = VME_USER_BUS_MAX; |
748 | } |
749 | |
750 | /* |
751 | * Here we just register the maximum number of devices we can and |
752 | * leave vme_user_match() to allow only 1 to go through to probe(). |
753 | * This way, if we later want to allow multiple user access devices, |
754 | * we just change the code in vme_user_match(). |
755 | */ |
756 | retval = vme_register_driver(&vme_user_driver, VME_MAX_SLOTS); |
757 | if (retval) |
758 | goto err_reg; |
759 | |
760 | return retval; |
761 | |
762 | err_reg: |
763 | err_nocard: |
764 | return retval; |
765 | } |
766 | |
767 | static void __exit vme_user_exit(void) |
768 | { |
769 | vme_unregister_driver(&vme_user_driver); |
770 | } |
771 | |
772 | MODULE_PARM_DESC(bus, "Enumeration of VMEbus to which the driver is connected" ); |
773 | module_param_array(bus, int, &bus_num, 0000); |
774 | |
775 | MODULE_DESCRIPTION("VME User Space Access Driver" ); |
776 | MODULE_AUTHOR("Martyn Welch <martyn.welch@ge.com>" ); |
777 | MODULE_LICENSE("GPL" ); |
778 | |
779 | module_init(vme_user_init); |
780 | module_exit(vme_user_exit); |
781 | |