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Commit | Line | Data |
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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> | |
d43c36dc | 22 | #include <linux/sched.h> |
beafc54c HK |
23 | #include <linux/string.h> |
24 | #include <linux/kobject.h> | |
25 | #include <linux/uio_driver.h> | |
26 | ||
27 | #define UIO_MAX_DEVICES 255 | |
28 | ||
29 | struct uio_device { | |
30 | struct module *owner; | |
31 | struct device *dev; | |
32 | int minor; | |
33 | atomic_t event; | |
34 | struct fasync_struct *async_queue; | |
35 | wait_queue_head_t wait; | |
36 | int vma_count; | |
37 | struct uio_info *info; | |
81e7c6a6 | 38 | struct kobject *map_dir; |
e70c412e | 39 | struct kobject *portio_dir; |
beafc54c HK |
40 | }; |
41 | ||
42 | static int uio_major; | |
43 | static DEFINE_IDR(uio_idr); | |
4f014691 | 44 | static const struct file_operations uio_fops; |
beafc54c HK |
45 | |
46 | /* UIO class infrastructure */ | |
47 | static struct uio_class { | |
48 | struct kref kref; | |
49 | struct class *class; | |
50 | } *uio_class; | |
51 | ||
0d4a7bc1 JC |
52 | /* Protect idr accesses */ |
53 | static DEFINE_MUTEX(minor_lock); | |
54 | ||
beafc54c HK |
55 | /* |
56 | * attributes | |
57 | */ | |
58 | ||
81e7c6a6 GKH |
59 | struct uio_map { |
60 | struct kobject kobj; | |
61 | struct uio_mem *mem; | |
beafc54c | 62 | }; |
81e7c6a6 | 63 | #define to_map(map) container_of(map, struct uio_map, kobj) |
beafc54c | 64 | |
82057791 HK |
65 | static ssize_t map_name_show(struct uio_mem *mem, char *buf) |
66 | { | |
67 | if (unlikely(!mem->name)) | |
68 | mem->name = ""; | |
69 | ||
70 | return sprintf(buf, "%s\n", mem->name); | |
71 | } | |
72 | ||
4f808bcd | 73 | static ssize_t map_addr_show(struct uio_mem *mem, char *buf) |
beafc54c | 74 | { |
4f808bcd BP |
75 | return sprintf(buf, "0x%lx\n", mem->addr); |
76 | } | |
beafc54c | 77 | |
4f808bcd BP |
78 | static ssize_t map_size_show(struct uio_mem *mem, char *buf) |
79 | { | |
80 | return sprintf(buf, "0x%lx\n", mem->size); | |
beafc54c HK |
81 | } |
82 | ||
e2b39df1 HK |
83 | static ssize_t map_offset_show(struct uio_mem *mem, char *buf) |
84 | { | |
85 | return sprintf(buf, "0x%lx\n", mem->addr & ~PAGE_MASK); | |
86 | } | |
87 | ||
e70c412e | 88 | struct map_sysfs_entry { |
4f808bcd BP |
89 | struct attribute attr; |
90 | ssize_t (*show)(struct uio_mem *, char *); | |
91 | ssize_t (*store)(struct uio_mem *, const char *, size_t); | |
92 | }; | |
93 | ||
82057791 HK |
94 | static struct map_sysfs_entry name_attribute = |
95 | __ATTR(name, S_IRUGO, map_name_show, NULL); | |
e70c412e | 96 | static struct map_sysfs_entry addr_attribute = |
4f808bcd | 97 | __ATTR(addr, S_IRUGO, map_addr_show, NULL); |
e70c412e | 98 | static struct map_sysfs_entry size_attribute = |
4f808bcd | 99 | __ATTR(size, S_IRUGO, map_size_show, NULL); |
e70c412e | 100 | static struct map_sysfs_entry offset_attribute = |
e2b39df1 | 101 | __ATTR(offset, S_IRUGO, map_offset_show, NULL); |
beafc54c | 102 | |
81e7c6a6 | 103 | static struct attribute *attrs[] = { |
82057791 | 104 | &name_attribute.attr, |
4f808bcd | 105 | &addr_attribute.attr, |
81e7c6a6 | 106 | &size_attribute.attr, |
e2b39df1 | 107 | &offset_attribute.attr, |
81e7c6a6 | 108 | NULL, /* need to NULL terminate the list of attributes */ |
beafc54c HK |
109 | }; |
110 | ||
81e7c6a6 GKH |
111 | static void map_release(struct kobject *kobj) |
112 | { | |
113 | struct uio_map *map = to_map(kobj); | |
114 | kfree(map); | |
115 | } | |
116 | ||
4f808bcd BP |
117 | static ssize_t map_type_show(struct kobject *kobj, struct attribute *attr, |
118 | char *buf) | |
119 | { | |
120 | struct uio_map *map = to_map(kobj); | |
121 | struct uio_mem *mem = map->mem; | |
e70c412e | 122 | struct map_sysfs_entry *entry; |
4f808bcd | 123 | |
e70c412e | 124 | entry = container_of(attr, struct map_sysfs_entry, attr); |
4f808bcd BP |
125 | |
126 | if (!entry->show) | |
127 | return -EIO; | |
128 | ||
129 | return entry->show(mem, buf); | |
130 | } | |
131 | ||
52cf25d0 | 132 | static const struct sysfs_ops map_sysfs_ops = { |
4f808bcd BP |
133 | .show = map_type_show, |
134 | }; | |
135 | ||
beafc54c | 136 | static struct kobj_type map_attr_type = { |
81e7c6a6 | 137 | .release = map_release, |
e70c412e | 138 | .sysfs_ops = &map_sysfs_ops, |
81e7c6a6 | 139 | .default_attrs = attrs, |
beafc54c HK |
140 | }; |
141 | ||
e70c412e HK |
142 | struct uio_portio { |
143 | struct kobject kobj; | |
144 | struct uio_port *port; | |
145 | }; | |
146 | #define to_portio(portio) container_of(portio, struct uio_portio, kobj) | |
147 | ||
82057791 HK |
148 | static ssize_t portio_name_show(struct uio_port *port, char *buf) |
149 | { | |
150 | if (unlikely(!port->name)) | |
151 | port->name = ""; | |
152 | ||
153 | return sprintf(buf, "%s\n", port->name); | |
154 | } | |
155 | ||
e70c412e HK |
156 | static ssize_t portio_start_show(struct uio_port *port, char *buf) |
157 | { | |
158 | return sprintf(buf, "0x%lx\n", port->start); | |
159 | } | |
160 | ||
161 | static ssize_t portio_size_show(struct uio_port *port, char *buf) | |
162 | { | |
163 | return sprintf(buf, "0x%lx\n", port->size); | |
164 | } | |
165 | ||
166 | static ssize_t portio_porttype_show(struct uio_port *port, char *buf) | |
167 | { | |
168 | const char *porttypes[] = {"none", "x86", "gpio", "other"}; | |
169 | ||
170 | if ((port->porttype < 0) || (port->porttype > UIO_PORT_OTHER)) | |
171 | return -EINVAL; | |
172 | ||
173 | return sprintf(buf, "port_%s\n", porttypes[port->porttype]); | |
174 | } | |
175 | ||
176 | struct portio_sysfs_entry { | |
177 | struct attribute attr; | |
178 | ssize_t (*show)(struct uio_port *, char *); | |
179 | ssize_t (*store)(struct uio_port *, const char *, size_t); | |
180 | }; | |
181 | ||
82057791 HK |
182 | static struct portio_sysfs_entry portio_name_attribute = |
183 | __ATTR(name, S_IRUGO, portio_name_show, NULL); | |
e70c412e HK |
184 | static struct portio_sysfs_entry portio_start_attribute = |
185 | __ATTR(start, S_IRUGO, portio_start_show, NULL); | |
186 | static struct portio_sysfs_entry portio_size_attribute = | |
187 | __ATTR(size, S_IRUGO, portio_size_show, NULL); | |
188 | static struct portio_sysfs_entry portio_porttype_attribute = | |
189 | __ATTR(porttype, S_IRUGO, portio_porttype_show, NULL); | |
190 | ||
191 | static struct attribute *portio_attrs[] = { | |
82057791 | 192 | &portio_name_attribute.attr, |
e70c412e HK |
193 | &portio_start_attribute.attr, |
194 | &portio_size_attribute.attr, | |
195 | &portio_porttype_attribute.attr, | |
196 | NULL, | |
197 | }; | |
198 | ||
199 | static void portio_release(struct kobject *kobj) | |
200 | { | |
201 | struct uio_portio *portio = to_portio(kobj); | |
202 | kfree(portio); | |
203 | } | |
204 | ||
205 | static ssize_t portio_type_show(struct kobject *kobj, struct attribute *attr, | |
206 | char *buf) | |
207 | { | |
208 | struct uio_portio *portio = to_portio(kobj); | |
209 | struct uio_port *port = portio->port; | |
210 | struct portio_sysfs_entry *entry; | |
211 | ||
212 | entry = container_of(attr, struct portio_sysfs_entry, attr); | |
213 | ||
214 | if (!entry->show) | |
215 | return -EIO; | |
216 | ||
217 | return entry->show(port, buf); | |
218 | } | |
219 | ||
52cf25d0 | 220 | static const struct sysfs_ops portio_sysfs_ops = { |
e70c412e HK |
221 | .show = portio_type_show, |
222 | }; | |
223 | ||
224 | static struct kobj_type portio_attr_type = { | |
225 | .release = portio_release, | |
226 | .sysfs_ops = &portio_sysfs_ops, | |
227 | .default_attrs = portio_attrs, | |
228 | }; | |
229 | ||
beafc54c HK |
230 | static ssize_t show_name(struct device *dev, |
231 | struct device_attribute *attr, char *buf) | |
232 | { | |
233 | struct uio_device *idev = dev_get_drvdata(dev); | |
234 | if (idev) | |
235 | return sprintf(buf, "%s\n", idev->info->name); | |
236 | else | |
237 | return -ENODEV; | |
238 | } | |
239 | static DEVICE_ATTR(name, S_IRUGO, show_name, NULL); | |
240 | ||
241 | static ssize_t show_version(struct device *dev, | |
242 | struct device_attribute *attr, char *buf) | |
243 | { | |
244 | struct uio_device *idev = dev_get_drvdata(dev); | |
245 | if (idev) | |
246 | return sprintf(buf, "%s\n", idev->info->version); | |
247 | else | |
248 | return -ENODEV; | |
249 | } | |
250 | static DEVICE_ATTR(version, S_IRUGO, show_version, NULL); | |
251 | ||
252 | static ssize_t show_event(struct device *dev, | |
253 | struct device_attribute *attr, char *buf) | |
254 | { | |
255 | struct uio_device *idev = dev_get_drvdata(dev); | |
256 | if (idev) | |
257 | return sprintf(buf, "%u\n", | |
258 | (unsigned int)atomic_read(&idev->event)); | |
259 | else | |
260 | return -ENODEV; | |
261 | } | |
262 | static DEVICE_ATTR(event, S_IRUGO, show_event, NULL); | |
263 | ||
264 | static struct attribute *uio_attrs[] = { | |
265 | &dev_attr_name.attr, | |
266 | &dev_attr_version.attr, | |
267 | &dev_attr_event.attr, | |
268 | NULL, | |
269 | }; | |
270 | ||
271 | static struct attribute_group uio_attr_grp = { | |
272 | .attrs = uio_attrs, | |
273 | }; | |
274 | ||
275 | /* | |
276 | * device functions | |
277 | */ | |
278 | static int uio_dev_add_attributes(struct uio_device *idev) | |
279 | { | |
280 | int ret; | |
e70c412e | 281 | int mi, pi; |
beafc54c | 282 | int map_found = 0; |
e70c412e | 283 | int portio_found = 0; |
beafc54c | 284 | struct uio_mem *mem; |
81e7c6a6 | 285 | struct uio_map *map; |
e70c412e HK |
286 | struct uio_port *port; |
287 | struct uio_portio *portio; | |
beafc54c HK |
288 | |
289 | ret = sysfs_create_group(&idev->dev->kobj, &uio_attr_grp); | |
290 | if (ret) | |
291 | goto err_group; | |
292 | ||
293 | for (mi = 0; mi < MAX_UIO_MAPS; mi++) { | |
294 | mem = &idev->info->mem[mi]; | |
295 | if (mem->size == 0) | |
296 | break; | |
297 | if (!map_found) { | |
298 | map_found = 1; | |
81e7c6a6 GKH |
299 | idev->map_dir = kobject_create_and_add("maps", |
300 | &idev->dev->kobj); | |
301 | if (!idev->map_dir) | |
e70c412e | 302 | goto err_map; |
beafc54c | 303 | } |
81e7c6a6 GKH |
304 | map = kzalloc(sizeof(*map), GFP_KERNEL); |
305 | if (!map) | |
e70c412e | 306 | goto err_map; |
f9cb074b | 307 | kobject_init(&map->kobj, &map_attr_type); |
81e7c6a6 GKH |
308 | map->mem = mem; |
309 | mem->map = map; | |
b2d6db58 | 310 | ret = kobject_add(&map->kobj, idev->map_dir, "map%d", mi); |
81e7c6a6 | 311 | if (ret) |
e70c412e | 312 | goto err_map; |
81e7c6a6 | 313 | ret = kobject_uevent(&map->kobj, KOBJ_ADD); |
beafc54c | 314 | if (ret) |
e70c412e HK |
315 | goto err_map; |
316 | } | |
317 | ||
318 | for (pi = 0; pi < MAX_UIO_PORT_REGIONS; pi++) { | |
319 | port = &idev->info->port[pi]; | |
320 | if (port->size == 0) | |
321 | break; | |
322 | if (!portio_found) { | |
323 | portio_found = 1; | |
324 | idev->portio_dir = kobject_create_and_add("portio", | |
325 | &idev->dev->kobj); | |
326 | if (!idev->portio_dir) | |
327 | goto err_portio; | |
328 | } | |
329 | portio = kzalloc(sizeof(*portio), GFP_KERNEL); | |
330 | if (!portio) | |
331 | goto err_portio; | |
332 | kobject_init(&portio->kobj, &portio_attr_type); | |
333 | portio->port = port; | |
334 | port->portio = portio; | |
335 | ret = kobject_add(&portio->kobj, idev->portio_dir, | |
336 | "port%d", pi); | |
337 | if (ret) | |
338 | goto err_portio; | |
339 | ret = kobject_uevent(&portio->kobj, KOBJ_ADD); | |
340 | if (ret) | |
341 | goto err_portio; | |
beafc54c HK |
342 | } |
343 | ||
344 | return 0; | |
345 | ||
e70c412e HK |
346 | err_portio: |
347 | for (pi--; pi >= 0; pi--) { | |
348 | port = &idev->info->port[pi]; | |
349 | portio = port->portio; | |
350 | kobject_put(&portio->kobj); | |
351 | } | |
352 | kobject_put(idev->portio_dir); | |
353 | err_map: | |
beafc54c HK |
354 | for (mi--; mi>=0; mi--) { |
355 | mem = &idev->info->mem[mi]; | |
81e7c6a6 | 356 | map = mem->map; |
c10997f6 | 357 | kobject_put(&map->kobj); |
beafc54c | 358 | } |
c10997f6 | 359 | kobject_put(idev->map_dir); |
beafc54c HK |
360 | sysfs_remove_group(&idev->dev->kobj, &uio_attr_grp); |
361 | err_group: | |
362 | dev_err(idev->dev, "error creating sysfs files (%d)\n", ret); | |
363 | return ret; | |
364 | } | |
365 | ||
366 | static void uio_dev_del_attributes(struct uio_device *idev) | |
367 | { | |
e70c412e | 368 | int i; |
beafc54c | 369 | struct uio_mem *mem; |
e70c412e HK |
370 | struct uio_port *port; |
371 | ||
372 | for (i = 0; i < MAX_UIO_MAPS; i++) { | |
373 | mem = &idev->info->mem[i]; | |
beafc54c HK |
374 | if (mem->size == 0) |
375 | break; | |
c10997f6 | 376 | kobject_put(&mem->map->kobj); |
beafc54c | 377 | } |
c10997f6 | 378 | kobject_put(idev->map_dir); |
e70c412e HK |
379 | |
380 | for (i = 0; i < MAX_UIO_PORT_REGIONS; i++) { | |
381 | port = &idev->info->port[i]; | |
382 | if (port->size == 0) | |
383 | break; | |
384 | kobject_put(&port->portio->kobj); | |
385 | } | |
386 | kobject_put(idev->portio_dir); | |
387 | ||
beafc54c HK |
388 | sysfs_remove_group(&idev->dev->kobj, &uio_attr_grp); |
389 | } | |
390 | ||
391 | static int uio_get_minor(struct uio_device *idev) | |
392 | { | |
beafc54c HK |
393 | int retval = -ENOMEM; |
394 | int id; | |
395 | ||
396 | mutex_lock(&minor_lock); | |
397 | if (idr_pre_get(&uio_idr, GFP_KERNEL) == 0) | |
398 | goto exit; | |
399 | ||
400 | retval = idr_get_new(&uio_idr, idev, &id); | |
401 | if (retval < 0) { | |
402 | if (retval == -EAGAIN) | |
403 | retval = -ENOMEM; | |
404 | goto exit; | |
405 | } | |
406 | idev->minor = id & MAX_ID_MASK; | |
407 | exit: | |
408 | mutex_unlock(&minor_lock); | |
409 | return retval; | |
410 | } | |
411 | ||
412 | static void uio_free_minor(struct uio_device *idev) | |
413 | { | |
0d4a7bc1 | 414 | mutex_lock(&minor_lock); |
beafc54c | 415 | idr_remove(&uio_idr, idev->minor); |
0d4a7bc1 | 416 | mutex_unlock(&minor_lock); |
beafc54c HK |
417 | } |
418 | ||
419 | /** | |
420 | * uio_event_notify - trigger an interrupt event | |
421 | * @info: UIO device capabilities | |
422 | */ | |
423 | void uio_event_notify(struct uio_info *info) | |
424 | { | |
425 | struct uio_device *idev = info->uio_dev; | |
426 | ||
427 | atomic_inc(&idev->event); | |
428 | wake_up_interruptible(&idev->wait); | |
429 | kill_fasync(&idev->async_queue, SIGIO, POLL_IN); | |
430 | } | |
431 | EXPORT_SYMBOL_GPL(uio_event_notify); | |
432 | ||
433 | /** | |
434 | * uio_interrupt - hardware interrupt handler | |
435 | * @irq: IRQ number, can be UIO_IRQ_CYCLIC for cyclic timer | |
436 | * @dev_id: Pointer to the devices uio_device structure | |
437 | */ | |
438 | static irqreturn_t uio_interrupt(int irq, void *dev_id) | |
439 | { | |
440 | struct uio_device *idev = (struct uio_device *)dev_id; | |
441 | irqreturn_t ret = idev->info->handler(irq, idev->info); | |
442 | ||
443 | if (ret == IRQ_HANDLED) | |
444 | uio_event_notify(idev->info); | |
445 | ||
446 | return ret; | |
447 | } | |
448 | ||
449 | struct uio_listener { | |
450 | struct uio_device *dev; | |
451 | s32 event_count; | |
452 | }; | |
453 | ||
454 | static int uio_open(struct inode *inode, struct file *filep) | |
455 | { | |
456 | struct uio_device *idev; | |
457 | struct uio_listener *listener; | |
458 | int ret = 0; | |
459 | ||
0d4a7bc1 | 460 | mutex_lock(&minor_lock); |
beafc54c | 461 | idev = idr_find(&uio_idr, iminor(inode)); |
0d4a7bc1 | 462 | mutex_unlock(&minor_lock); |
fbc8a81d JC |
463 | if (!idev) { |
464 | ret = -ENODEV; | |
465 | goto out; | |
466 | } | |
beafc54c | 467 | |
fbc8a81d JC |
468 | if (!try_module_get(idev->owner)) { |
469 | ret = -ENODEV; | |
470 | goto out; | |
471 | } | |
610ad506 | 472 | |
beafc54c | 473 | listener = kmalloc(sizeof(*listener), GFP_KERNEL); |
610ad506 UKK |
474 | if (!listener) { |
475 | ret = -ENOMEM; | |
476 | goto err_alloc_listener; | |
477 | } | |
beafc54c HK |
478 | |
479 | listener->dev = idev; | |
480 | listener->event_count = atomic_read(&idev->event); | |
481 | filep->private_data = listener; | |
482 | ||
483 | if (idev->info->open) { | |
beafc54c | 484 | ret = idev->info->open(idev->info, inode); |
610ad506 UKK |
485 | if (ret) |
486 | goto err_infoopen; | |
beafc54c | 487 | } |
610ad506 UKK |
488 | return 0; |
489 | ||
490 | err_infoopen: | |
610ad506 | 491 | kfree(listener); |
610ad506 | 492 | |
0d4a7bc1 | 493 | err_alloc_listener: |
610ad506 | 494 | module_put(idev->owner); |
beafc54c | 495 | |
fbc8a81d | 496 | out: |
beafc54c HK |
497 | return ret; |
498 | } | |
499 | ||
500 | static int uio_fasync(int fd, struct file *filep, int on) | |
501 | { | |
502 | struct uio_listener *listener = filep->private_data; | |
503 | struct uio_device *idev = listener->dev; | |
504 | ||
505 | return fasync_helper(fd, filep, on, &idev->async_queue); | |
506 | } | |
507 | ||
508 | static int uio_release(struct inode *inode, struct file *filep) | |
509 | { | |
510 | int ret = 0; | |
511 | struct uio_listener *listener = filep->private_data; | |
512 | struct uio_device *idev = listener->dev; | |
513 | ||
610ad506 | 514 | if (idev->info->release) |
beafc54c | 515 | ret = idev->info->release(idev->info, inode); |
610ad506 UKK |
516 | |
517 | module_put(idev->owner); | |
beafc54c HK |
518 | kfree(listener); |
519 | return ret; | |
520 | } | |
521 | ||
522 | static unsigned int uio_poll(struct file *filep, poll_table *wait) | |
523 | { | |
524 | struct uio_listener *listener = filep->private_data; | |
525 | struct uio_device *idev = listener->dev; | |
526 | ||
527 | if (idev->info->irq == UIO_IRQ_NONE) | |
528 | return -EIO; | |
529 | ||
530 | poll_wait(filep, &idev->wait, wait); | |
531 | if (listener->event_count != atomic_read(&idev->event)) | |
532 | return POLLIN | POLLRDNORM; | |
533 | return 0; | |
534 | } | |
535 | ||
536 | static ssize_t uio_read(struct file *filep, char __user *buf, | |
537 | size_t count, loff_t *ppos) | |
538 | { | |
539 | struct uio_listener *listener = filep->private_data; | |
540 | struct uio_device *idev = listener->dev; | |
541 | DECLARE_WAITQUEUE(wait, current); | |
542 | ssize_t retval; | |
543 | s32 event_count; | |
544 | ||
545 | if (idev->info->irq == UIO_IRQ_NONE) | |
546 | return -EIO; | |
547 | ||
548 | if (count != sizeof(s32)) | |
549 | return -EINVAL; | |
550 | ||
551 | add_wait_queue(&idev->wait, &wait); | |
552 | ||
553 | do { | |
554 | set_current_state(TASK_INTERRUPTIBLE); | |
555 | ||
556 | event_count = atomic_read(&idev->event); | |
557 | if (event_count != listener->event_count) { | |
558 | if (copy_to_user(buf, &event_count, count)) | |
559 | retval = -EFAULT; | |
560 | else { | |
561 | listener->event_count = event_count; | |
562 | retval = count; | |
563 | } | |
564 | break; | |
565 | } | |
566 | ||
567 | if (filep->f_flags & O_NONBLOCK) { | |
568 | retval = -EAGAIN; | |
569 | break; | |
570 | } | |
571 | ||
572 | if (signal_pending(current)) { | |
573 | retval = -ERESTARTSYS; | |
574 | break; | |
575 | } | |
576 | schedule(); | |
577 | } while (1); | |
578 | ||
579 | __set_current_state(TASK_RUNNING); | |
580 | remove_wait_queue(&idev->wait, &wait); | |
581 | ||
582 | return retval; | |
583 | } | |
584 | ||
328a14e7 HK |
585 | static ssize_t uio_write(struct file *filep, const char __user *buf, |
586 | size_t count, loff_t *ppos) | |
587 | { | |
588 | struct uio_listener *listener = filep->private_data; | |
589 | struct uio_device *idev = listener->dev; | |
590 | ssize_t retval; | |
591 | s32 irq_on; | |
592 | ||
593 | if (idev->info->irq == UIO_IRQ_NONE) | |
594 | return -EIO; | |
595 | ||
596 | if (count != sizeof(s32)) | |
597 | return -EINVAL; | |
598 | ||
599 | if (!idev->info->irqcontrol) | |
600 | return -ENOSYS; | |
601 | ||
602 | if (copy_from_user(&irq_on, buf, count)) | |
603 | return -EFAULT; | |
604 | ||
605 | retval = idev->info->irqcontrol(idev->info, irq_on); | |
606 | ||
607 | return retval ? retval : sizeof(s32); | |
608 | } | |
609 | ||
beafc54c HK |
610 | static int uio_find_mem_index(struct vm_area_struct *vma) |
611 | { | |
612 | int mi; | |
613 | struct uio_device *idev = vma->vm_private_data; | |
614 | ||
615 | for (mi = 0; mi < MAX_UIO_MAPS; mi++) { | |
616 | if (idev->info->mem[mi].size == 0) | |
617 | return -1; | |
618 | if (vma->vm_pgoff == mi) | |
619 | return mi; | |
620 | } | |
621 | return -1; | |
622 | } | |
623 | ||
624 | static void uio_vma_open(struct vm_area_struct *vma) | |
625 | { | |
626 | struct uio_device *idev = vma->vm_private_data; | |
627 | idev->vma_count++; | |
628 | } | |
629 | ||
630 | static void uio_vma_close(struct vm_area_struct *vma) | |
631 | { | |
632 | struct uio_device *idev = vma->vm_private_data; | |
633 | idev->vma_count--; | |
634 | } | |
635 | ||
a18b630d | 636 | static int uio_vma_fault(struct vm_area_struct *vma, struct vm_fault *vmf) |
beafc54c HK |
637 | { |
638 | struct uio_device *idev = vma->vm_private_data; | |
a18b630d | 639 | struct page *page; |
02683ffd | 640 | unsigned long offset; |
beafc54c HK |
641 | |
642 | int mi = uio_find_mem_index(vma); | |
643 | if (mi < 0) | |
a18b630d | 644 | return VM_FAULT_SIGBUS; |
beafc54c | 645 | |
02683ffd AH |
646 | /* |
647 | * We need to subtract mi because userspace uses offset = N*PAGE_SIZE | |
648 | * to use mem[N]. | |
649 | */ | |
650 | offset = (vmf->pgoff - mi) << PAGE_SHIFT; | |
651 | ||
beafc54c | 652 | if (idev->info->mem[mi].memtype == UIO_MEM_LOGICAL) |
02683ffd | 653 | page = virt_to_page(idev->info->mem[mi].addr + offset); |
beafc54c | 654 | else |
02683ffd AH |
655 | page = vmalloc_to_page((void *)idev->info->mem[mi].addr |
656 | + offset); | |
beafc54c | 657 | get_page(page); |
a18b630d NP |
658 | vmf->page = page; |
659 | return 0; | |
beafc54c HK |
660 | } |
661 | ||
f0f37e2f | 662 | static const struct vm_operations_struct uio_vm_ops = { |
beafc54c HK |
663 | .open = uio_vma_open, |
664 | .close = uio_vma_close, | |
a18b630d | 665 | .fault = uio_vma_fault, |
beafc54c HK |
666 | }; |
667 | ||
668 | static int uio_mmap_physical(struct vm_area_struct *vma) | |
669 | { | |
670 | struct uio_device *idev = vma->vm_private_data; | |
671 | int mi = uio_find_mem_index(vma); | |
672 | if (mi < 0) | |
673 | return -EINVAL; | |
674 | ||
675 | vma->vm_flags |= VM_IO | VM_RESERVED; | |
c9698d6b JSC |
676 | |
677 | vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); | |
beafc54c HK |
678 | |
679 | return remap_pfn_range(vma, | |
680 | vma->vm_start, | |
681 | idev->info->mem[mi].addr >> PAGE_SHIFT, | |
682 | vma->vm_end - vma->vm_start, | |
683 | vma->vm_page_prot); | |
684 | } | |
685 | ||
686 | static int uio_mmap_logical(struct vm_area_struct *vma) | |
687 | { | |
688 | vma->vm_flags |= VM_RESERVED; | |
689 | vma->vm_ops = &uio_vm_ops; | |
690 | uio_vma_open(vma); | |
691 | return 0; | |
692 | } | |
693 | ||
694 | static int uio_mmap(struct file *filep, struct vm_area_struct *vma) | |
695 | { | |
696 | struct uio_listener *listener = filep->private_data; | |
697 | struct uio_device *idev = listener->dev; | |
698 | int mi; | |
699 | unsigned long requested_pages, actual_pages; | |
700 | int ret = 0; | |
701 | ||
702 | if (vma->vm_end < vma->vm_start) | |
703 | return -EINVAL; | |
704 | ||
705 | vma->vm_private_data = idev; | |
706 | ||
707 | mi = uio_find_mem_index(vma); | |
708 | if (mi < 0) | |
709 | return -EINVAL; | |
710 | ||
711 | requested_pages = (vma->vm_end - vma->vm_start) >> PAGE_SHIFT; | |
6da2d377 IA |
712 | actual_pages = ((idev->info->mem[mi].addr & ~PAGE_MASK) |
713 | + idev->info->mem[mi].size + PAGE_SIZE -1) >> PAGE_SHIFT; | |
beafc54c HK |
714 | if (requested_pages > actual_pages) |
715 | return -EINVAL; | |
716 | ||
717 | if (idev->info->mmap) { | |
beafc54c | 718 | ret = idev->info->mmap(idev->info, vma); |
beafc54c HK |
719 | return ret; |
720 | } | |
721 | ||
722 | switch (idev->info->mem[mi].memtype) { | |
723 | case UIO_MEM_PHYS: | |
724 | return uio_mmap_physical(vma); | |
725 | case UIO_MEM_LOGICAL: | |
726 | case UIO_MEM_VIRTUAL: | |
727 | return uio_mmap_logical(vma); | |
728 | default: | |
729 | return -EINVAL; | |
730 | } | |
731 | } | |
732 | ||
4f014691 | 733 | static const struct file_operations uio_fops = { |
beafc54c HK |
734 | .owner = THIS_MODULE, |
735 | .open = uio_open, | |
736 | .release = uio_release, | |
737 | .read = uio_read, | |
328a14e7 | 738 | .write = uio_write, |
beafc54c HK |
739 | .mmap = uio_mmap, |
740 | .poll = uio_poll, | |
741 | .fasync = uio_fasync, | |
742 | }; | |
743 | ||
744 | static int uio_major_init(void) | |
745 | { | |
746 | uio_major = register_chrdev(0, "uio", &uio_fops); | |
747 | if (uio_major < 0) | |
748 | return uio_major; | |
749 | return 0; | |
750 | } | |
751 | ||
752 | static void uio_major_cleanup(void) | |
753 | { | |
754 | unregister_chrdev(uio_major, "uio"); | |
755 | } | |
756 | ||
757 | static int init_uio_class(void) | |
758 | { | |
759 | int ret = 0; | |
760 | ||
761 | if (uio_class != NULL) { | |
762 | kref_get(&uio_class->kref); | |
763 | goto exit; | |
764 | } | |
765 | ||
766 | /* This is the first time in here, set everything up properly */ | |
767 | ret = uio_major_init(); | |
768 | if (ret) | |
769 | goto exit; | |
770 | ||
771 | uio_class = kzalloc(sizeof(*uio_class), GFP_KERNEL); | |
772 | if (!uio_class) { | |
773 | ret = -ENOMEM; | |
774 | goto err_kzalloc; | |
775 | } | |
776 | ||
777 | kref_init(&uio_class->kref); | |
778 | uio_class->class = class_create(THIS_MODULE, "uio"); | |
779 | if (IS_ERR(uio_class->class)) { | |
780 | ret = IS_ERR(uio_class->class); | |
781 | printk(KERN_ERR "class_create failed for uio\n"); | |
782 | goto err_class_create; | |
783 | } | |
784 | return 0; | |
785 | ||
786 | err_class_create: | |
787 | kfree(uio_class); | |
788 | uio_class = NULL; | |
789 | err_kzalloc: | |
790 | uio_major_cleanup(); | |
791 | exit: | |
792 | return ret; | |
793 | } | |
794 | ||
795 | static void release_uio_class(struct kref *kref) | |
796 | { | |
797 | /* Ok, we cheat as we know we only have one uio_class */ | |
798 | class_destroy(uio_class->class); | |
799 | kfree(uio_class); | |
800 | uio_major_cleanup(); | |
801 | uio_class = NULL; | |
802 | } | |
803 | ||
804 | static void uio_class_destroy(void) | |
805 | { | |
806 | if (uio_class) | |
807 | kref_put(&uio_class->kref, release_uio_class); | |
808 | } | |
809 | ||
810 | /** | |
811 | * uio_register_device - register a new userspace IO device | |
812 | * @owner: module that creates the new device | |
813 | * @parent: parent device | |
814 | * @info: UIO device capabilities | |
815 | * | |
816 | * returns zero on success or a negative error code. | |
817 | */ | |
818 | int __uio_register_device(struct module *owner, | |
819 | struct device *parent, | |
820 | struct uio_info *info) | |
821 | { | |
822 | struct uio_device *idev; | |
823 | int ret = 0; | |
824 | ||
825 | if (!parent || !info || !info->name || !info->version) | |
826 | return -EINVAL; | |
827 | ||
828 | info->uio_dev = NULL; | |
829 | ||
830 | ret = init_uio_class(); | |
831 | if (ret) | |
832 | return ret; | |
833 | ||
834 | idev = kzalloc(sizeof(*idev), GFP_KERNEL); | |
835 | if (!idev) { | |
836 | ret = -ENOMEM; | |
837 | goto err_kzalloc; | |
838 | } | |
839 | ||
840 | idev->owner = owner; | |
841 | idev->info = info; | |
842 | init_waitqueue_head(&idev->wait); | |
843 | atomic_set(&idev->event, 0); | |
844 | ||
845 | ret = uio_get_minor(idev); | |
846 | if (ret) | |
847 | goto err_get_minor; | |
848 | ||
a9b12619 GKH |
849 | idev->dev = device_create(uio_class->class, parent, |
850 | MKDEV(uio_major, idev->minor), idev, | |
851 | "uio%d", idev->minor); | |
beafc54c HK |
852 | if (IS_ERR(idev->dev)) { |
853 | printk(KERN_ERR "UIO: device register failed\n"); | |
854 | ret = PTR_ERR(idev->dev); | |
855 | goto err_device_create; | |
856 | } | |
beafc54c HK |
857 | |
858 | ret = uio_dev_add_attributes(idev); | |
859 | if (ret) | |
860 | goto err_uio_dev_add_attributes; | |
861 | ||
862 | info->uio_dev = idev; | |
863 | ||
864 | if (idev->info->irq >= 0) { | |
865 | ret = request_irq(idev->info->irq, uio_interrupt, | |
866 | idev->info->irq_flags, idev->info->name, idev); | |
867 | if (ret) | |
868 | goto err_request_irq; | |
869 | } | |
870 | ||
871 | return 0; | |
872 | ||
873 | err_request_irq: | |
874 | uio_dev_del_attributes(idev); | |
875 | err_uio_dev_add_attributes: | |
876 | device_destroy(uio_class->class, MKDEV(uio_major, idev->minor)); | |
877 | err_device_create: | |
878 | uio_free_minor(idev); | |
879 | err_get_minor: | |
880 | kfree(idev); | |
881 | err_kzalloc: | |
882 | uio_class_destroy(); | |
883 | return ret; | |
884 | } | |
885 | EXPORT_SYMBOL_GPL(__uio_register_device); | |
886 | ||
887 | /** | |
888 | * uio_unregister_device - unregister a industrial IO device | |
889 | * @info: UIO device capabilities | |
890 | * | |
891 | */ | |
892 | void uio_unregister_device(struct uio_info *info) | |
893 | { | |
894 | struct uio_device *idev; | |
895 | ||
896 | if (!info || !info->uio_dev) | |
897 | return; | |
898 | ||
899 | idev = info->uio_dev; | |
900 | ||
901 | uio_free_minor(idev); | |
902 | ||
903 | if (info->irq >= 0) | |
904 | free_irq(info->irq, idev); | |
905 | ||
906 | uio_dev_del_attributes(idev); | |
907 | ||
908 | dev_set_drvdata(idev->dev, NULL); | |
909 | device_destroy(uio_class->class, MKDEV(uio_major, idev->minor)); | |
910 | kfree(idev); | |
911 | uio_class_destroy(); | |
912 | ||
913 | return; | |
914 | } | |
915 | EXPORT_SYMBOL_GPL(uio_unregister_device); | |
916 | ||
917 | static int __init uio_init(void) | |
918 | { | |
919 | return 0; | |
920 | } | |
921 | ||
922 | static void __exit uio_exit(void) | |
923 | { | |
924 | } | |
925 | ||
926 | module_init(uio_init) | |
927 | module_exit(uio_exit) | |
928 | MODULE_LICENSE("GPL v2"); |