Commit | Line | Data |
---|---|---|
beafc54c HK |
1 | /* |
2 | * drivers/uio/uio.c | |
3 | * | |
4 | * Copyright(C) 2005, Benedikt Spranger <b.spranger@linutronix.de> | |
5 | * Copyright(C) 2005, Thomas Gleixner <tglx@linutronix.de> | |
6 | * Copyright(C) 2006, Hans J. Koch <hjk@linutronix.de> | |
7 | * Copyright(C) 2006, Greg Kroah-Hartman <greg@kroah.com> | |
8 | * | |
9 | * Userspace IO | |
10 | * | |
11 | * Base Functions | |
12 | * | |
13 | * Licensed under the GPLv2 only. | |
14 | */ | |
15 | ||
16 | #include <linux/module.h> | |
17 | #include <linux/init.h> | |
18 | #include <linux/poll.h> | |
19 | #include <linux/device.h> | |
20 | #include <linux/mm.h> | |
21 | #include <linux/idr.h> | |
22 | #include <linux/string.h> | |
23 | #include <linux/kobject.h> | |
24 | #include <linux/uio_driver.h> | |
25 | ||
26 | #define UIO_MAX_DEVICES 255 | |
27 | ||
28 | struct uio_device { | |
29 | struct module *owner; | |
30 | struct device *dev; | |
31 | int minor; | |
32 | atomic_t event; | |
33 | struct fasync_struct *async_queue; | |
34 | wait_queue_head_t wait; | |
35 | int vma_count; | |
36 | struct uio_info *info; | |
81e7c6a6 | 37 | struct kobject *map_dir; |
e70c412e | 38 | struct kobject *portio_dir; |
beafc54c HK |
39 | }; |
40 | ||
41 | static int uio_major; | |
42 | static DEFINE_IDR(uio_idr); | |
4f014691 | 43 | static const struct file_operations uio_fops; |
beafc54c HK |
44 | |
45 | /* UIO class infrastructure */ | |
46 | static struct uio_class { | |
47 | struct kref kref; | |
48 | struct class *class; | |
49 | } *uio_class; | |
50 | ||
0d4a7bc1 JC |
51 | /* Protect idr accesses */ |
52 | static DEFINE_MUTEX(minor_lock); | |
53 | ||
beafc54c HK |
54 | /* |
55 | * attributes | |
56 | */ | |
57 | ||
81e7c6a6 GKH |
58 | struct uio_map { |
59 | struct kobject kobj; | |
60 | struct uio_mem *mem; | |
beafc54c | 61 | }; |
81e7c6a6 | 62 | #define to_map(map) container_of(map, struct uio_map, kobj) |
beafc54c | 63 | |
4f808bcd | 64 | static ssize_t map_addr_show(struct uio_mem *mem, char *buf) |
beafc54c | 65 | { |
4f808bcd BP |
66 | return sprintf(buf, "0x%lx\n", mem->addr); |
67 | } | |
beafc54c | 68 | |
4f808bcd BP |
69 | static ssize_t map_size_show(struct uio_mem *mem, char *buf) |
70 | { | |
71 | return sprintf(buf, "0x%lx\n", mem->size); | |
beafc54c HK |
72 | } |
73 | ||
e2b39df1 HK |
74 | static ssize_t map_offset_show(struct uio_mem *mem, char *buf) |
75 | { | |
76 | return sprintf(buf, "0x%lx\n", mem->addr & ~PAGE_MASK); | |
77 | } | |
78 | ||
e70c412e | 79 | struct map_sysfs_entry { |
4f808bcd BP |
80 | struct attribute attr; |
81 | ssize_t (*show)(struct uio_mem *, char *); | |
82 | ssize_t (*store)(struct uio_mem *, const char *, size_t); | |
83 | }; | |
84 | ||
e70c412e | 85 | static struct map_sysfs_entry addr_attribute = |
4f808bcd | 86 | __ATTR(addr, S_IRUGO, map_addr_show, NULL); |
e70c412e | 87 | static struct map_sysfs_entry size_attribute = |
4f808bcd | 88 | __ATTR(size, S_IRUGO, map_size_show, NULL); |
e70c412e | 89 | static struct map_sysfs_entry offset_attribute = |
e2b39df1 | 90 | __ATTR(offset, S_IRUGO, map_offset_show, NULL); |
beafc54c | 91 | |
81e7c6a6 | 92 | static struct attribute *attrs[] = { |
4f808bcd | 93 | &addr_attribute.attr, |
81e7c6a6 | 94 | &size_attribute.attr, |
e2b39df1 | 95 | &offset_attribute.attr, |
81e7c6a6 | 96 | NULL, /* need to NULL terminate the list of attributes */ |
beafc54c HK |
97 | }; |
98 | ||
81e7c6a6 GKH |
99 | static void map_release(struct kobject *kobj) |
100 | { | |
101 | struct uio_map *map = to_map(kobj); | |
102 | kfree(map); | |
103 | } | |
104 | ||
4f808bcd BP |
105 | static ssize_t map_type_show(struct kobject *kobj, struct attribute *attr, |
106 | char *buf) | |
107 | { | |
108 | struct uio_map *map = to_map(kobj); | |
109 | struct uio_mem *mem = map->mem; | |
e70c412e | 110 | struct map_sysfs_entry *entry; |
4f808bcd | 111 | |
e70c412e | 112 | entry = container_of(attr, struct map_sysfs_entry, attr); |
4f808bcd BP |
113 | |
114 | if (!entry->show) | |
115 | return -EIO; | |
116 | ||
117 | return entry->show(mem, buf); | |
118 | } | |
119 | ||
e70c412e | 120 | static struct sysfs_ops map_sysfs_ops = { |
4f808bcd BP |
121 | .show = map_type_show, |
122 | }; | |
123 | ||
beafc54c | 124 | static struct kobj_type map_attr_type = { |
81e7c6a6 | 125 | .release = map_release, |
e70c412e | 126 | .sysfs_ops = &map_sysfs_ops, |
81e7c6a6 | 127 | .default_attrs = attrs, |
beafc54c HK |
128 | }; |
129 | ||
e70c412e HK |
130 | struct uio_portio { |
131 | struct kobject kobj; | |
132 | struct uio_port *port; | |
133 | }; | |
134 | #define to_portio(portio) container_of(portio, struct uio_portio, kobj) | |
135 | ||
136 | static ssize_t portio_start_show(struct uio_port *port, char *buf) | |
137 | { | |
138 | return sprintf(buf, "0x%lx\n", port->start); | |
139 | } | |
140 | ||
141 | static ssize_t portio_size_show(struct uio_port *port, char *buf) | |
142 | { | |
143 | return sprintf(buf, "0x%lx\n", port->size); | |
144 | } | |
145 | ||
146 | static ssize_t portio_porttype_show(struct uio_port *port, char *buf) | |
147 | { | |
148 | const char *porttypes[] = {"none", "x86", "gpio", "other"}; | |
149 | ||
150 | if ((port->porttype < 0) || (port->porttype > UIO_PORT_OTHER)) | |
151 | return -EINVAL; | |
152 | ||
153 | return sprintf(buf, "port_%s\n", porttypes[port->porttype]); | |
154 | } | |
155 | ||
156 | struct portio_sysfs_entry { | |
157 | struct attribute attr; | |
158 | ssize_t (*show)(struct uio_port *, char *); | |
159 | ssize_t (*store)(struct uio_port *, const char *, size_t); | |
160 | }; | |
161 | ||
162 | static struct portio_sysfs_entry portio_start_attribute = | |
163 | __ATTR(start, S_IRUGO, portio_start_show, NULL); | |
164 | static struct portio_sysfs_entry portio_size_attribute = | |
165 | __ATTR(size, S_IRUGO, portio_size_show, NULL); | |
166 | static struct portio_sysfs_entry portio_porttype_attribute = | |
167 | __ATTR(porttype, S_IRUGO, portio_porttype_show, NULL); | |
168 | ||
169 | static struct attribute *portio_attrs[] = { | |
170 | &portio_start_attribute.attr, | |
171 | &portio_size_attribute.attr, | |
172 | &portio_porttype_attribute.attr, | |
173 | NULL, | |
174 | }; | |
175 | ||
176 | static void portio_release(struct kobject *kobj) | |
177 | { | |
178 | struct uio_portio *portio = to_portio(kobj); | |
179 | kfree(portio); | |
180 | } | |
181 | ||
182 | static ssize_t portio_type_show(struct kobject *kobj, struct attribute *attr, | |
183 | char *buf) | |
184 | { | |
185 | struct uio_portio *portio = to_portio(kobj); | |
186 | struct uio_port *port = portio->port; | |
187 | struct portio_sysfs_entry *entry; | |
188 | ||
189 | entry = container_of(attr, struct portio_sysfs_entry, attr); | |
190 | ||
191 | if (!entry->show) | |
192 | return -EIO; | |
193 | ||
194 | return entry->show(port, buf); | |
195 | } | |
196 | ||
197 | static struct sysfs_ops portio_sysfs_ops = { | |
198 | .show = portio_type_show, | |
199 | }; | |
200 | ||
201 | static struct kobj_type portio_attr_type = { | |
202 | .release = portio_release, | |
203 | .sysfs_ops = &portio_sysfs_ops, | |
204 | .default_attrs = portio_attrs, | |
205 | }; | |
206 | ||
beafc54c HK |
207 | static ssize_t show_name(struct device *dev, |
208 | struct device_attribute *attr, char *buf) | |
209 | { | |
210 | struct uio_device *idev = dev_get_drvdata(dev); | |
211 | if (idev) | |
212 | return sprintf(buf, "%s\n", idev->info->name); | |
213 | else | |
214 | return -ENODEV; | |
215 | } | |
216 | static DEVICE_ATTR(name, S_IRUGO, show_name, NULL); | |
217 | ||
218 | static ssize_t show_version(struct device *dev, | |
219 | struct device_attribute *attr, char *buf) | |
220 | { | |
221 | struct uio_device *idev = dev_get_drvdata(dev); | |
222 | if (idev) | |
223 | return sprintf(buf, "%s\n", idev->info->version); | |
224 | else | |
225 | return -ENODEV; | |
226 | } | |
227 | static DEVICE_ATTR(version, S_IRUGO, show_version, NULL); | |
228 | ||
229 | static ssize_t show_event(struct device *dev, | |
230 | struct device_attribute *attr, char *buf) | |
231 | { | |
232 | struct uio_device *idev = dev_get_drvdata(dev); | |
233 | if (idev) | |
234 | return sprintf(buf, "%u\n", | |
235 | (unsigned int)atomic_read(&idev->event)); | |
236 | else | |
237 | return -ENODEV; | |
238 | } | |
239 | static DEVICE_ATTR(event, S_IRUGO, show_event, NULL); | |
240 | ||
241 | static struct attribute *uio_attrs[] = { | |
242 | &dev_attr_name.attr, | |
243 | &dev_attr_version.attr, | |
244 | &dev_attr_event.attr, | |
245 | NULL, | |
246 | }; | |
247 | ||
248 | static struct attribute_group uio_attr_grp = { | |
249 | .attrs = uio_attrs, | |
250 | }; | |
251 | ||
252 | /* | |
253 | * device functions | |
254 | */ | |
255 | static int uio_dev_add_attributes(struct uio_device *idev) | |
256 | { | |
257 | int ret; | |
e70c412e | 258 | int mi, pi; |
beafc54c | 259 | int map_found = 0; |
e70c412e | 260 | int portio_found = 0; |
beafc54c | 261 | struct uio_mem *mem; |
81e7c6a6 | 262 | struct uio_map *map; |
e70c412e HK |
263 | struct uio_port *port; |
264 | struct uio_portio *portio; | |
beafc54c HK |
265 | |
266 | ret = sysfs_create_group(&idev->dev->kobj, &uio_attr_grp); | |
267 | if (ret) | |
268 | goto err_group; | |
269 | ||
270 | for (mi = 0; mi < MAX_UIO_MAPS; mi++) { | |
271 | mem = &idev->info->mem[mi]; | |
272 | if (mem->size == 0) | |
273 | break; | |
274 | if (!map_found) { | |
275 | map_found = 1; | |
81e7c6a6 GKH |
276 | idev->map_dir = kobject_create_and_add("maps", |
277 | &idev->dev->kobj); | |
278 | if (!idev->map_dir) | |
e70c412e | 279 | goto err_map; |
beafc54c | 280 | } |
81e7c6a6 GKH |
281 | map = kzalloc(sizeof(*map), GFP_KERNEL); |
282 | if (!map) | |
e70c412e | 283 | goto err_map; |
f9cb074b | 284 | kobject_init(&map->kobj, &map_attr_type); |
81e7c6a6 GKH |
285 | map->mem = mem; |
286 | mem->map = map; | |
b2d6db58 | 287 | ret = kobject_add(&map->kobj, idev->map_dir, "map%d", mi); |
81e7c6a6 | 288 | if (ret) |
e70c412e | 289 | goto err_map; |
81e7c6a6 | 290 | ret = kobject_uevent(&map->kobj, KOBJ_ADD); |
beafc54c | 291 | if (ret) |
e70c412e HK |
292 | goto err_map; |
293 | } | |
294 | ||
295 | for (pi = 0; pi < MAX_UIO_PORT_REGIONS; pi++) { | |
296 | port = &idev->info->port[pi]; | |
297 | if (port->size == 0) | |
298 | break; | |
299 | if (!portio_found) { | |
300 | portio_found = 1; | |
301 | idev->portio_dir = kobject_create_and_add("portio", | |
302 | &idev->dev->kobj); | |
303 | if (!idev->portio_dir) | |
304 | goto err_portio; | |
305 | } | |
306 | portio = kzalloc(sizeof(*portio), GFP_KERNEL); | |
307 | if (!portio) | |
308 | goto err_portio; | |
309 | kobject_init(&portio->kobj, &portio_attr_type); | |
310 | portio->port = port; | |
311 | port->portio = portio; | |
312 | ret = kobject_add(&portio->kobj, idev->portio_dir, | |
313 | "port%d", pi); | |
314 | if (ret) | |
315 | goto err_portio; | |
316 | ret = kobject_uevent(&portio->kobj, KOBJ_ADD); | |
317 | if (ret) | |
318 | goto err_portio; | |
beafc54c HK |
319 | } |
320 | ||
321 | return 0; | |
322 | ||
e70c412e HK |
323 | err_portio: |
324 | for (pi--; pi >= 0; pi--) { | |
325 | port = &idev->info->port[pi]; | |
326 | portio = port->portio; | |
327 | kobject_put(&portio->kobj); | |
328 | } | |
329 | kobject_put(idev->portio_dir); | |
330 | err_map: | |
beafc54c HK |
331 | for (mi--; mi>=0; mi--) { |
332 | mem = &idev->info->mem[mi]; | |
81e7c6a6 | 333 | map = mem->map; |
c10997f6 | 334 | kobject_put(&map->kobj); |
beafc54c | 335 | } |
c10997f6 | 336 | kobject_put(idev->map_dir); |
beafc54c HK |
337 | sysfs_remove_group(&idev->dev->kobj, &uio_attr_grp); |
338 | err_group: | |
339 | dev_err(idev->dev, "error creating sysfs files (%d)\n", ret); | |
340 | return ret; | |
341 | } | |
342 | ||
343 | static void uio_dev_del_attributes(struct uio_device *idev) | |
344 | { | |
e70c412e | 345 | int i; |
beafc54c | 346 | struct uio_mem *mem; |
e70c412e HK |
347 | struct uio_port *port; |
348 | ||
349 | for (i = 0; i < MAX_UIO_MAPS; i++) { | |
350 | mem = &idev->info->mem[i]; | |
beafc54c HK |
351 | if (mem->size == 0) |
352 | break; | |
c10997f6 | 353 | kobject_put(&mem->map->kobj); |
beafc54c | 354 | } |
c10997f6 | 355 | kobject_put(idev->map_dir); |
e70c412e HK |
356 | |
357 | for (i = 0; i < MAX_UIO_PORT_REGIONS; i++) { | |
358 | port = &idev->info->port[i]; | |
359 | if (port->size == 0) | |
360 | break; | |
361 | kobject_put(&port->portio->kobj); | |
362 | } | |
363 | kobject_put(idev->portio_dir); | |
364 | ||
beafc54c HK |
365 | sysfs_remove_group(&idev->dev->kobj, &uio_attr_grp); |
366 | } | |
367 | ||
368 | static int uio_get_minor(struct uio_device *idev) | |
369 | { | |
beafc54c HK |
370 | int retval = -ENOMEM; |
371 | int id; | |
372 | ||
373 | mutex_lock(&minor_lock); | |
374 | if (idr_pre_get(&uio_idr, GFP_KERNEL) == 0) | |
375 | goto exit; | |
376 | ||
377 | retval = idr_get_new(&uio_idr, idev, &id); | |
378 | if (retval < 0) { | |
379 | if (retval == -EAGAIN) | |
380 | retval = -ENOMEM; | |
381 | goto exit; | |
382 | } | |
383 | idev->minor = id & MAX_ID_MASK; | |
384 | exit: | |
385 | mutex_unlock(&minor_lock); | |
386 | return retval; | |
387 | } | |
388 | ||
389 | static void uio_free_minor(struct uio_device *idev) | |
390 | { | |
0d4a7bc1 | 391 | mutex_lock(&minor_lock); |
beafc54c | 392 | idr_remove(&uio_idr, idev->minor); |
0d4a7bc1 | 393 | mutex_unlock(&minor_lock); |
beafc54c HK |
394 | } |
395 | ||
396 | /** | |
397 | * uio_event_notify - trigger an interrupt event | |
398 | * @info: UIO device capabilities | |
399 | */ | |
400 | void uio_event_notify(struct uio_info *info) | |
401 | { | |
402 | struct uio_device *idev = info->uio_dev; | |
403 | ||
404 | atomic_inc(&idev->event); | |
405 | wake_up_interruptible(&idev->wait); | |
406 | kill_fasync(&idev->async_queue, SIGIO, POLL_IN); | |
407 | } | |
408 | EXPORT_SYMBOL_GPL(uio_event_notify); | |
409 | ||
410 | /** | |
411 | * uio_interrupt - hardware interrupt handler | |
412 | * @irq: IRQ number, can be UIO_IRQ_CYCLIC for cyclic timer | |
413 | * @dev_id: Pointer to the devices uio_device structure | |
414 | */ | |
415 | static irqreturn_t uio_interrupt(int irq, void *dev_id) | |
416 | { | |
417 | struct uio_device *idev = (struct uio_device *)dev_id; | |
418 | irqreturn_t ret = idev->info->handler(irq, idev->info); | |
419 | ||
420 | if (ret == IRQ_HANDLED) | |
421 | uio_event_notify(idev->info); | |
422 | ||
423 | return ret; | |
424 | } | |
425 | ||
426 | struct uio_listener { | |
427 | struct uio_device *dev; | |
428 | s32 event_count; | |
429 | }; | |
430 | ||
431 | static int uio_open(struct inode *inode, struct file *filep) | |
432 | { | |
433 | struct uio_device *idev; | |
434 | struct uio_listener *listener; | |
435 | int ret = 0; | |
436 | ||
0d4a7bc1 | 437 | mutex_lock(&minor_lock); |
beafc54c | 438 | idev = idr_find(&uio_idr, iminor(inode)); |
0d4a7bc1 | 439 | mutex_unlock(&minor_lock); |
fbc8a81d JC |
440 | if (!idev) { |
441 | ret = -ENODEV; | |
442 | goto out; | |
443 | } | |
beafc54c | 444 | |
fbc8a81d JC |
445 | if (!try_module_get(idev->owner)) { |
446 | ret = -ENODEV; | |
447 | goto out; | |
448 | } | |
610ad506 | 449 | |
beafc54c | 450 | listener = kmalloc(sizeof(*listener), GFP_KERNEL); |
610ad506 UKK |
451 | if (!listener) { |
452 | ret = -ENOMEM; | |
453 | goto err_alloc_listener; | |
454 | } | |
beafc54c HK |
455 | |
456 | listener->dev = idev; | |
457 | listener->event_count = atomic_read(&idev->event); | |
458 | filep->private_data = listener; | |
459 | ||
460 | if (idev->info->open) { | |
beafc54c | 461 | ret = idev->info->open(idev->info, inode); |
610ad506 UKK |
462 | if (ret) |
463 | goto err_infoopen; | |
beafc54c | 464 | } |
610ad506 UKK |
465 | return 0; |
466 | ||
467 | err_infoopen: | |
610ad506 | 468 | kfree(listener); |
610ad506 | 469 | |
0d4a7bc1 | 470 | err_alloc_listener: |
610ad506 | 471 | module_put(idev->owner); |
beafc54c | 472 | |
fbc8a81d | 473 | out: |
beafc54c HK |
474 | return ret; |
475 | } | |
476 | ||
477 | static int uio_fasync(int fd, struct file *filep, int on) | |
478 | { | |
479 | struct uio_listener *listener = filep->private_data; | |
480 | struct uio_device *idev = listener->dev; | |
481 | ||
482 | return fasync_helper(fd, filep, on, &idev->async_queue); | |
483 | } | |
484 | ||
485 | static int uio_release(struct inode *inode, struct file *filep) | |
486 | { | |
487 | int ret = 0; | |
488 | struct uio_listener *listener = filep->private_data; | |
489 | struct uio_device *idev = listener->dev; | |
490 | ||
610ad506 | 491 | if (idev->info->release) |
beafc54c | 492 | ret = idev->info->release(idev->info, inode); |
610ad506 UKK |
493 | |
494 | module_put(idev->owner); | |
beafc54c HK |
495 | kfree(listener); |
496 | return ret; | |
497 | } | |
498 | ||
499 | static unsigned int uio_poll(struct file *filep, poll_table *wait) | |
500 | { | |
501 | struct uio_listener *listener = filep->private_data; | |
502 | struct uio_device *idev = listener->dev; | |
503 | ||
504 | if (idev->info->irq == UIO_IRQ_NONE) | |
505 | return -EIO; | |
506 | ||
507 | poll_wait(filep, &idev->wait, wait); | |
508 | if (listener->event_count != atomic_read(&idev->event)) | |
509 | return POLLIN | POLLRDNORM; | |
510 | return 0; | |
511 | } | |
512 | ||
513 | static ssize_t uio_read(struct file *filep, char __user *buf, | |
514 | size_t count, loff_t *ppos) | |
515 | { | |
516 | struct uio_listener *listener = filep->private_data; | |
517 | struct uio_device *idev = listener->dev; | |
518 | DECLARE_WAITQUEUE(wait, current); | |
519 | ssize_t retval; | |
520 | s32 event_count; | |
521 | ||
522 | if (idev->info->irq == UIO_IRQ_NONE) | |
523 | return -EIO; | |
524 | ||
525 | if (count != sizeof(s32)) | |
526 | return -EINVAL; | |
527 | ||
528 | add_wait_queue(&idev->wait, &wait); | |
529 | ||
530 | do { | |
531 | set_current_state(TASK_INTERRUPTIBLE); | |
532 | ||
533 | event_count = atomic_read(&idev->event); | |
534 | if (event_count != listener->event_count) { | |
535 | if (copy_to_user(buf, &event_count, count)) | |
536 | retval = -EFAULT; | |
537 | else { | |
538 | listener->event_count = event_count; | |
539 | retval = count; | |
540 | } | |
541 | break; | |
542 | } | |
543 | ||
544 | if (filep->f_flags & O_NONBLOCK) { | |
545 | retval = -EAGAIN; | |
546 | break; | |
547 | } | |
548 | ||
549 | if (signal_pending(current)) { | |
550 | retval = -ERESTARTSYS; | |
551 | break; | |
552 | } | |
553 | schedule(); | |
554 | } while (1); | |
555 | ||
556 | __set_current_state(TASK_RUNNING); | |
557 | remove_wait_queue(&idev->wait, &wait); | |
558 | ||
559 | return retval; | |
560 | } | |
561 | ||
328a14e7 HK |
562 | static ssize_t uio_write(struct file *filep, const char __user *buf, |
563 | size_t count, loff_t *ppos) | |
564 | { | |
565 | struct uio_listener *listener = filep->private_data; | |
566 | struct uio_device *idev = listener->dev; | |
567 | ssize_t retval; | |
568 | s32 irq_on; | |
569 | ||
570 | if (idev->info->irq == UIO_IRQ_NONE) | |
571 | return -EIO; | |
572 | ||
573 | if (count != sizeof(s32)) | |
574 | return -EINVAL; | |
575 | ||
576 | if (!idev->info->irqcontrol) | |
577 | return -ENOSYS; | |
578 | ||
579 | if (copy_from_user(&irq_on, buf, count)) | |
580 | return -EFAULT; | |
581 | ||
582 | retval = idev->info->irqcontrol(idev->info, irq_on); | |
583 | ||
584 | return retval ? retval : sizeof(s32); | |
585 | } | |
586 | ||
beafc54c HK |
587 | static int uio_find_mem_index(struct vm_area_struct *vma) |
588 | { | |
589 | int mi; | |
590 | struct uio_device *idev = vma->vm_private_data; | |
591 | ||
592 | for (mi = 0; mi < MAX_UIO_MAPS; mi++) { | |
593 | if (idev->info->mem[mi].size == 0) | |
594 | return -1; | |
595 | if (vma->vm_pgoff == mi) | |
596 | return mi; | |
597 | } | |
598 | return -1; | |
599 | } | |
600 | ||
601 | static void uio_vma_open(struct vm_area_struct *vma) | |
602 | { | |
603 | struct uio_device *idev = vma->vm_private_data; | |
604 | idev->vma_count++; | |
605 | } | |
606 | ||
607 | static void uio_vma_close(struct vm_area_struct *vma) | |
608 | { | |
609 | struct uio_device *idev = vma->vm_private_data; | |
610 | idev->vma_count--; | |
611 | } | |
612 | ||
a18b630d | 613 | static int uio_vma_fault(struct vm_area_struct *vma, struct vm_fault *vmf) |
beafc54c HK |
614 | { |
615 | struct uio_device *idev = vma->vm_private_data; | |
a18b630d | 616 | struct page *page; |
02683ffd | 617 | unsigned long offset; |
beafc54c HK |
618 | |
619 | int mi = uio_find_mem_index(vma); | |
620 | if (mi < 0) | |
a18b630d | 621 | return VM_FAULT_SIGBUS; |
beafc54c | 622 | |
02683ffd AH |
623 | /* |
624 | * We need to subtract mi because userspace uses offset = N*PAGE_SIZE | |
625 | * to use mem[N]. | |
626 | */ | |
627 | offset = (vmf->pgoff - mi) << PAGE_SHIFT; | |
628 | ||
beafc54c | 629 | if (idev->info->mem[mi].memtype == UIO_MEM_LOGICAL) |
02683ffd | 630 | page = virt_to_page(idev->info->mem[mi].addr + offset); |
beafc54c | 631 | else |
02683ffd AH |
632 | page = vmalloc_to_page((void *)idev->info->mem[mi].addr |
633 | + offset); | |
beafc54c | 634 | get_page(page); |
a18b630d NP |
635 | vmf->page = page; |
636 | return 0; | |
beafc54c HK |
637 | } |
638 | ||
639 | static struct vm_operations_struct uio_vm_ops = { | |
640 | .open = uio_vma_open, | |
641 | .close = uio_vma_close, | |
a18b630d | 642 | .fault = uio_vma_fault, |
beafc54c HK |
643 | }; |
644 | ||
645 | static int uio_mmap_physical(struct vm_area_struct *vma) | |
646 | { | |
647 | struct uio_device *idev = vma->vm_private_data; | |
648 | int mi = uio_find_mem_index(vma); | |
649 | if (mi < 0) | |
650 | return -EINVAL; | |
651 | ||
652 | vma->vm_flags |= VM_IO | VM_RESERVED; | |
c9698d6b JSC |
653 | |
654 | vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); | |
beafc54c HK |
655 | |
656 | return remap_pfn_range(vma, | |
657 | vma->vm_start, | |
658 | idev->info->mem[mi].addr >> PAGE_SHIFT, | |
659 | vma->vm_end - vma->vm_start, | |
660 | vma->vm_page_prot); | |
661 | } | |
662 | ||
663 | static int uio_mmap_logical(struct vm_area_struct *vma) | |
664 | { | |
665 | vma->vm_flags |= VM_RESERVED; | |
666 | vma->vm_ops = &uio_vm_ops; | |
667 | uio_vma_open(vma); | |
668 | return 0; | |
669 | } | |
670 | ||
671 | static int uio_mmap(struct file *filep, struct vm_area_struct *vma) | |
672 | { | |
673 | struct uio_listener *listener = filep->private_data; | |
674 | struct uio_device *idev = listener->dev; | |
675 | int mi; | |
676 | unsigned long requested_pages, actual_pages; | |
677 | int ret = 0; | |
678 | ||
679 | if (vma->vm_end < vma->vm_start) | |
680 | return -EINVAL; | |
681 | ||
682 | vma->vm_private_data = idev; | |
683 | ||
684 | mi = uio_find_mem_index(vma); | |
685 | if (mi < 0) | |
686 | return -EINVAL; | |
687 | ||
688 | requested_pages = (vma->vm_end - vma->vm_start) >> PAGE_SHIFT; | |
689 | actual_pages = (idev->info->mem[mi].size + PAGE_SIZE -1) >> PAGE_SHIFT; | |
690 | if (requested_pages > actual_pages) | |
691 | return -EINVAL; | |
692 | ||
693 | if (idev->info->mmap) { | |
beafc54c | 694 | ret = idev->info->mmap(idev->info, vma); |
beafc54c HK |
695 | return ret; |
696 | } | |
697 | ||
698 | switch (idev->info->mem[mi].memtype) { | |
699 | case UIO_MEM_PHYS: | |
700 | return uio_mmap_physical(vma); | |
701 | case UIO_MEM_LOGICAL: | |
702 | case UIO_MEM_VIRTUAL: | |
703 | return uio_mmap_logical(vma); | |
704 | default: | |
705 | return -EINVAL; | |
706 | } | |
707 | } | |
708 | ||
4f014691 | 709 | static const struct file_operations uio_fops = { |
beafc54c HK |
710 | .owner = THIS_MODULE, |
711 | .open = uio_open, | |
712 | .release = uio_release, | |
713 | .read = uio_read, | |
328a14e7 | 714 | .write = uio_write, |
beafc54c HK |
715 | .mmap = uio_mmap, |
716 | .poll = uio_poll, | |
717 | .fasync = uio_fasync, | |
718 | }; | |
719 | ||
720 | static int uio_major_init(void) | |
721 | { | |
722 | uio_major = register_chrdev(0, "uio", &uio_fops); | |
723 | if (uio_major < 0) | |
724 | return uio_major; | |
725 | return 0; | |
726 | } | |
727 | ||
728 | static void uio_major_cleanup(void) | |
729 | { | |
730 | unregister_chrdev(uio_major, "uio"); | |
731 | } | |
732 | ||
733 | static int init_uio_class(void) | |
734 | { | |
735 | int ret = 0; | |
736 | ||
737 | if (uio_class != NULL) { | |
738 | kref_get(&uio_class->kref); | |
739 | goto exit; | |
740 | } | |
741 | ||
742 | /* This is the first time in here, set everything up properly */ | |
743 | ret = uio_major_init(); | |
744 | if (ret) | |
745 | goto exit; | |
746 | ||
747 | uio_class = kzalloc(sizeof(*uio_class), GFP_KERNEL); | |
748 | if (!uio_class) { | |
749 | ret = -ENOMEM; | |
750 | goto err_kzalloc; | |
751 | } | |
752 | ||
753 | kref_init(&uio_class->kref); | |
754 | uio_class->class = class_create(THIS_MODULE, "uio"); | |
755 | if (IS_ERR(uio_class->class)) { | |
756 | ret = IS_ERR(uio_class->class); | |
757 | printk(KERN_ERR "class_create failed for uio\n"); | |
758 | goto err_class_create; | |
759 | } | |
760 | return 0; | |
761 | ||
762 | err_class_create: | |
763 | kfree(uio_class); | |
764 | uio_class = NULL; | |
765 | err_kzalloc: | |
766 | uio_major_cleanup(); | |
767 | exit: | |
768 | return ret; | |
769 | } | |
770 | ||
771 | static void release_uio_class(struct kref *kref) | |
772 | { | |
773 | /* Ok, we cheat as we know we only have one uio_class */ | |
774 | class_destroy(uio_class->class); | |
775 | kfree(uio_class); | |
776 | uio_major_cleanup(); | |
777 | uio_class = NULL; | |
778 | } | |
779 | ||
780 | static void uio_class_destroy(void) | |
781 | { | |
782 | if (uio_class) | |
783 | kref_put(&uio_class->kref, release_uio_class); | |
784 | } | |
785 | ||
786 | /** | |
787 | * uio_register_device - register a new userspace IO device | |
788 | * @owner: module that creates the new device | |
789 | * @parent: parent device | |
790 | * @info: UIO device capabilities | |
791 | * | |
792 | * returns zero on success or a negative error code. | |
793 | */ | |
794 | int __uio_register_device(struct module *owner, | |
795 | struct device *parent, | |
796 | struct uio_info *info) | |
797 | { | |
798 | struct uio_device *idev; | |
799 | int ret = 0; | |
800 | ||
801 | if (!parent || !info || !info->name || !info->version) | |
802 | return -EINVAL; | |
803 | ||
804 | info->uio_dev = NULL; | |
805 | ||
806 | ret = init_uio_class(); | |
807 | if (ret) | |
808 | return ret; | |
809 | ||
810 | idev = kzalloc(sizeof(*idev), GFP_KERNEL); | |
811 | if (!idev) { | |
812 | ret = -ENOMEM; | |
813 | goto err_kzalloc; | |
814 | } | |
815 | ||
816 | idev->owner = owner; | |
817 | idev->info = info; | |
818 | init_waitqueue_head(&idev->wait); | |
819 | atomic_set(&idev->event, 0); | |
820 | ||
821 | ret = uio_get_minor(idev); | |
822 | if (ret) | |
823 | goto err_get_minor; | |
824 | ||
a9b12619 GKH |
825 | idev->dev = device_create(uio_class->class, parent, |
826 | MKDEV(uio_major, idev->minor), idev, | |
827 | "uio%d", idev->minor); | |
beafc54c HK |
828 | if (IS_ERR(idev->dev)) { |
829 | printk(KERN_ERR "UIO: device register failed\n"); | |
830 | ret = PTR_ERR(idev->dev); | |
831 | goto err_device_create; | |
832 | } | |
beafc54c HK |
833 | |
834 | ret = uio_dev_add_attributes(idev); | |
835 | if (ret) | |
836 | goto err_uio_dev_add_attributes; | |
837 | ||
838 | info->uio_dev = idev; | |
839 | ||
840 | if (idev->info->irq >= 0) { | |
841 | ret = request_irq(idev->info->irq, uio_interrupt, | |
842 | idev->info->irq_flags, idev->info->name, idev); | |
843 | if (ret) | |
844 | goto err_request_irq; | |
845 | } | |
846 | ||
847 | return 0; | |
848 | ||
849 | err_request_irq: | |
850 | uio_dev_del_attributes(idev); | |
851 | err_uio_dev_add_attributes: | |
852 | device_destroy(uio_class->class, MKDEV(uio_major, idev->minor)); | |
853 | err_device_create: | |
854 | uio_free_minor(idev); | |
855 | err_get_minor: | |
856 | kfree(idev); | |
857 | err_kzalloc: | |
858 | uio_class_destroy(); | |
859 | return ret; | |
860 | } | |
861 | EXPORT_SYMBOL_GPL(__uio_register_device); | |
862 | ||
863 | /** | |
864 | * uio_unregister_device - unregister a industrial IO device | |
865 | * @info: UIO device capabilities | |
866 | * | |
867 | */ | |
868 | void uio_unregister_device(struct uio_info *info) | |
869 | { | |
870 | struct uio_device *idev; | |
871 | ||
872 | if (!info || !info->uio_dev) | |
873 | return; | |
874 | ||
875 | idev = info->uio_dev; | |
876 | ||
877 | uio_free_minor(idev); | |
878 | ||
879 | if (info->irq >= 0) | |
880 | free_irq(info->irq, idev); | |
881 | ||
882 | uio_dev_del_attributes(idev); | |
883 | ||
884 | dev_set_drvdata(idev->dev, NULL); | |
885 | device_destroy(uio_class->class, MKDEV(uio_major, idev->minor)); | |
886 | kfree(idev); | |
887 | uio_class_destroy(); | |
888 | ||
889 | return; | |
890 | } | |
891 | EXPORT_SYMBOL_GPL(uio_unregister_device); | |
892 | ||
893 | static int __init uio_init(void) | |
894 | { | |
895 | return 0; | |
896 | } | |
897 | ||
898 | static void __exit uio_exit(void) | |
899 | { | |
900 | } | |
901 | ||
902 | module_init(uio_init) | |
903 | module_exit(uio_exit) | |
904 | MODULE_LICENSE("GPL v2"); |