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> | |
5a0e3ad6 | 20 | #include <linux/slab.h> |
beafc54c HK |
21 | #include <linux/mm.h> |
22 | #include <linux/idr.h> | |
d43c36dc | 23 | #include <linux/sched.h> |
beafc54c HK |
24 | #include <linux/string.h> |
25 | #include <linux/kobject.h> | |
91960a46 | 26 | #include <linux/cdev.h> |
beafc54c HK |
27 | #include <linux/uio_driver.h> |
28 | ||
91960a46 | 29 | #define UIO_MAX_DEVICES (1U << MINORBITS) |
beafc54c HK |
30 | |
31 | struct uio_device { | |
32 | struct module *owner; | |
33 | struct device *dev; | |
34 | int minor; | |
35 | atomic_t event; | |
36 | struct fasync_struct *async_queue; | |
37 | wait_queue_head_t wait; | |
38 | int vma_count; | |
39 | struct uio_info *info; | |
81e7c6a6 | 40 | struct kobject *map_dir; |
e70c412e | 41 | struct kobject *portio_dir; |
beafc54c HK |
42 | }; |
43 | ||
44 | static int uio_major; | |
91960a46 | 45 | static struct cdev *uio_cdev; |
beafc54c | 46 | static DEFINE_IDR(uio_idr); |
4f014691 | 47 | static const struct file_operations uio_fops; |
beafc54c HK |
48 | |
49 | /* UIO class infrastructure */ | |
3d4f9d76 | 50 | static struct class *uio_class; |
beafc54c | 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); | |
70a9156b | 234 | return sprintf(buf, "%s\n", idev->info->name); |
beafc54c HK |
235 | } |
236 | static DEVICE_ATTR(name, S_IRUGO, show_name, NULL); | |
237 | ||
238 | static ssize_t show_version(struct device *dev, | |
239 | struct device_attribute *attr, char *buf) | |
240 | { | |
241 | struct uio_device *idev = dev_get_drvdata(dev); | |
70a9156b | 242 | return sprintf(buf, "%s\n", idev->info->version); |
beafc54c HK |
243 | } |
244 | static DEVICE_ATTR(version, S_IRUGO, show_version, NULL); | |
245 | ||
246 | static ssize_t show_event(struct device *dev, | |
247 | struct device_attribute *attr, char *buf) | |
248 | { | |
249 | struct uio_device *idev = dev_get_drvdata(dev); | |
70a9156b | 250 | return sprintf(buf, "%u\n", (unsigned int)atomic_read(&idev->event)); |
beafc54c HK |
251 | } |
252 | static DEVICE_ATTR(event, S_IRUGO, show_event, NULL); | |
253 | ||
254 | static struct attribute *uio_attrs[] = { | |
255 | &dev_attr_name.attr, | |
256 | &dev_attr_version.attr, | |
257 | &dev_attr_event.attr, | |
258 | NULL, | |
259 | }; | |
260 | ||
261 | static struct attribute_group uio_attr_grp = { | |
262 | .attrs = uio_attrs, | |
263 | }; | |
264 | ||
265 | /* | |
266 | * device functions | |
267 | */ | |
268 | static int uio_dev_add_attributes(struct uio_device *idev) | |
269 | { | |
270 | int ret; | |
e70c412e | 271 | int mi, pi; |
beafc54c | 272 | int map_found = 0; |
e70c412e | 273 | int portio_found = 0; |
beafc54c | 274 | struct uio_mem *mem; |
81e7c6a6 | 275 | struct uio_map *map; |
e70c412e HK |
276 | struct uio_port *port; |
277 | struct uio_portio *portio; | |
beafc54c HK |
278 | |
279 | ret = sysfs_create_group(&idev->dev->kobj, &uio_attr_grp); | |
280 | if (ret) | |
281 | goto err_group; | |
282 | ||
283 | for (mi = 0; mi < MAX_UIO_MAPS; mi++) { | |
284 | mem = &idev->info->mem[mi]; | |
285 | if (mem->size == 0) | |
286 | break; | |
287 | if (!map_found) { | |
288 | map_found = 1; | |
81e7c6a6 GKH |
289 | idev->map_dir = kobject_create_and_add("maps", |
290 | &idev->dev->kobj); | |
291 | if (!idev->map_dir) | |
e70c412e | 292 | goto err_map; |
beafc54c | 293 | } |
81e7c6a6 GKH |
294 | map = kzalloc(sizeof(*map), GFP_KERNEL); |
295 | if (!map) | |
e70c412e | 296 | goto err_map; |
f9cb074b | 297 | kobject_init(&map->kobj, &map_attr_type); |
81e7c6a6 GKH |
298 | map->mem = mem; |
299 | mem->map = map; | |
b2d6db58 | 300 | ret = kobject_add(&map->kobj, idev->map_dir, "map%d", mi); |
81e7c6a6 | 301 | if (ret) |
e70c412e | 302 | goto err_map; |
81e7c6a6 | 303 | ret = kobject_uevent(&map->kobj, KOBJ_ADD); |
beafc54c | 304 | if (ret) |
e70c412e HK |
305 | goto err_map; |
306 | } | |
307 | ||
308 | for (pi = 0; pi < MAX_UIO_PORT_REGIONS; pi++) { | |
309 | port = &idev->info->port[pi]; | |
310 | if (port->size == 0) | |
311 | break; | |
312 | if (!portio_found) { | |
313 | portio_found = 1; | |
314 | idev->portio_dir = kobject_create_and_add("portio", | |
315 | &idev->dev->kobj); | |
316 | if (!idev->portio_dir) | |
317 | goto err_portio; | |
318 | } | |
319 | portio = kzalloc(sizeof(*portio), GFP_KERNEL); | |
320 | if (!portio) | |
321 | goto err_portio; | |
322 | kobject_init(&portio->kobj, &portio_attr_type); | |
323 | portio->port = port; | |
324 | port->portio = portio; | |
325 | ret = kobject_add(&portio->kobj, idev->portio_dir, | |
326 | "port%d", pi); | |
327 | if (ret) | |
328 | goto err_portio; | |
329 | ret = kobject_uevent(&portio->kobj, KOBJ_ADD); | |
330 | if (ret) | |
331 | goto err_portio; | |
beafc54c HK |
332 | } |
333 | ||
334 | return 0; | |
335 | ||
e70c412e HK |
336 | err_portio: |
337 | for (pi--; pi >= 0; pi--) { | |
338 | port = &idev->info->port[pi]; | |
339 | portio = port->portio; | |
340 | kobject_put(&portio->kobj); | |
341 | } | |
342 | kobject_put(idev->portio_dir); | |
343 | err_map: | |
beafc54c HK |
344 | for (mi--; mi>=0; mi--) { |
345 | mem = &idev->info->mem[mi]; | |
81e7c6a6 | 346 | map = mem->map; |
c10997f6 | 347 | kobject_put(&map->kobj); |
beafc54c | 348 | } |
c10997f6 | 349 | kobject_put(idev->map_dir); |
beafc54c HK |
350 | sysfs_remove_group(&idev->dev->kobj, &uio_attr_grp); |
351 | err_group: | |
352 | dev_err(idev->dev, "error creating sysfs files (%d)\n", ret); | |
353 | return ret; | |
354 | } | |
355 | ||
356 | static void uio_dev_del_attributes(struct uio_device *idev) | |
357 | { | |
e70c412e | 358 | int i; |
beafc54c | 359 | struct uio_mem *mem; |
e70c412e HK |
360 | struct uio_port *port; |
361 | ||
362 | for (i = 0; i < MAX_UIO_MAPS; i++) { | |
363 | mem = &idev->info->mem[i]; | |
beafc54c HK |
364 | if (mem->size == 0) |
365 | break; | |
c10997f6 | 366 | kobject_put(&mem->map->kobj); |
beafc54c | 367 | } |
c10997f6 | 368 | kobject_put(idev->map_dir); |
e70c412e HK |
369 | |
370 | for (i = 0; i < MAX_UIO_PORT_REGIONS; i++) { | |
371 | port = &idev->info->port[i]; | |
372 | if (port->size == 0) | |
373 | break; | |
374 | kobject_put(&port->portio->kobj); | |
375 | } | |
376 | kobject_put(idev->portio_dir); | |
377 | ||
beafc54c HK |
378 | sysfs_remove_group(&idev->dev->kobj, &uio_attr_grp); |
379 | } | |
380 | ||
381 | static int uio_get_minor(struct uio_device *idev) | |
382 | { | |
beafc54c HK |
383 | int retval = -ENOMEM; |
384 | int id; | |
385 | ||
386 | mutex_lock(&minor_lock); | |
387 | if (idr_pre_get(&uio_idr, GFP_KERNEL) == 0) | |
388 | goto exit; | |
389 | ||
390 | retval = idr_get_new(&uio_idr, idev, &id); | |
391 | if (retval < 0) { | |
392 | if (retval == -EAGAIN) | |
393 | retval = -ENOMEM; | |
394 | goto exit; | |
395 | } | |
396 | idev->minor = id & MAX_ID_MASK; | |
397 | exit: | |
398 | mutex_unlock(&minor_lock); | |
399 | return retval; | |
400 | } | |
401 | ||
402 | static void uio_free_minor(struct uio_device *idev) | |
403 | { | |
0d4a7bc1 | 404 | mutex_lock(&minor_lock); |
beafc54c | 405 | idr_remove(&uio_idr, idev->minor); |
0d4a7bc1 | 406 | mutex_unlock(&minor_lock); |
beafc54c HK |
407 | } |
408 | ||
409 | /** | |
410 | * uio_event_notify - trigger an interrupt event | |
411 | * @info: UIO device capabilities | |
412 | */ | |
413 | void uio_event_notify(struct uio_info *info) | |
414 | { | |
415 | struct uio_device *idev = info->uio_dev; | |
416 | ||
417 | atomic_inc(&idev->event); | |
418 | wake_up_interruptible(&idev->wait); | |
419 | kill_fasync(&idev->async_queue, SIGIO, POLL_IN); | |
420 | } | |
421 | EXPORT_SYMBOL_GPL(uio_event_notify); | |
422 | ||
423 | /** | |
424 | * uio_interrupt - hardware interrupt handler | |
425 | * @irq: IRQ number, can be UIO_IRQ_CYCLIC for cyclic timer | |
426 | * @dev_id: Pointer to the devices uio_device structure | |
427 | */ | |
428 | static irqreturn_t uio_interrupt(int irq, void *dev_id) | |
429 | { | |
430 | struct uio_device *idev = (struct uio_device *)dev_id; | |
431 | irqreturn_t ret = idev->info->handler(irq, idev->info); | |
432 | ||
433 | if (ret == IRQ_HANDLED) | |
434 | uio_event_notify(idev->info); | |
435 | ||
436 | return ret; | |
437 | } | |
438 | ||
439 | struct uio_listener { | |
440 | struct uio_device *dev; | |
441 | s32 event_count; | |
442 | }; | |
443 | ||
444 | static int uio_open(struct inode *inode, struct file *filep) | |
445 | { | |
446 | struct uio_device *idev; | |
447 | struct uio_listener *listener; | |
448 | int ret = 0; | |
449 | ||
0d4a7bc1 | 450 | mutex_lock(&minor_lock); |
beafc54c | 451 | idev = idr_find(&uio_idr, iminor(inode)); |
0d4a7bc1 | 452 | mutex_unlock(&minor_lock); |
fbc8a81d JC |
453 | if (!idev) { |
454 | ret = -ENODEV; | |
455 | goto out; | |
456 | } | |
beafc54c | 457 | |
fbc8a81d JC |
458 | if (!try_module_get(idev->owner)) { |
459 | ret = -ENODEV; | |
460 | goto out; | |
461 | } | |
610ad506 | 462 | |
beafc54c | 463 | listener = kmalloc(sizeof(*listener), GFP_KERNEL); |
610ad506 UKK |
464 | if (!listener) { |
465 | ret = -ENOMEM; | |
466 | goto err_alloc_listener; | |
467 | } | |
beafc54c HK |
468 | |
469 | listener->dev = idev; | |
470 | listener->event_count = atomic_read(&idev->event); | |
471 | filep->private_data = listener; | |
472 | ||
473 | if (idev->info->open) { | |
beafc54c | 474 | ret = idev->info->open(idev->info, inode); |
610ad506 UKK |
475 | if (ret) |
476 | goto err_infoopen; | |
beafc54c | 477 | } |
610ad506 UKK |
478 | return 0; |
479 | ||
480 | err_infoopen: | |
610ad506 | 481 | kfree(listener); |
610ad506 | 482 | |
0d4a7bc1 | 483 | err_alloc_listener: |
610ad506 | 484 | module_put(idev->owner); |
beafc54c | 485 | |
fbc8a81d | 486 | out: |
beafc54c HK |
487 | return ret; |
488 | } | |
489 | ||
490 | static int uio_fasync(int fd, struct file *filep, int on) | |
491 | { | |
492 | struct uio_listener *listener = filep->private_data; | |
493 | struct uio_device *idev = listener->dev; | |
494 | ||
495 | return fasync_helper(fd, filep, on, &idev->async_queue); | |
496 | } | |
497 | ||
498 | static int uio_release(struct inode *inode, struct file *filep) | |
499 | { | |
500 | int ret = 0; | |
501 | struct uio_listener *listener = filep->private_data; | |
502 | struct uio_device *idev = listener->dev; | |
503 | ||
610ad506 | 504 | if (idev->info->release) |
beafc54c | 505 | ret = idev->info->release(idev->info, inode); |
610ad506 UKK |
506 | |
507 | module_put(idev->owner); | |
beafc54c HK |
508 | kfree(listener); |
509 | return ret; | |
510 | } | |
511 | ||
512 | static unsigned int uio_poll(struct file *filep, poll_table *wait) | |
513 | { | |
514 | struct uio_listener *listener = filep->private_data; | |
515 | struct uio_device *idev = listener->dev; | |
516 | ||
6427a765 | 517 | if (!idev->info->irq) |
beafc54c HK |
518 | return -EIO; |
519 | ||
520 | poll_wait(filep, &idev->wait, wait); | |
521 | if (listener->event_count != atomic_read(&idev->event)) | |
522 | return POLLIN | POLLRDNORM; | |
523 | return 0; | |
524 | } | |
525 | ||
526 | static ssize_t uio_read(struct file *filep, char __user *buf, | |
527 | size_t count, loff_t *ppos) | |
528 | { | |
529 | struct uio_listener *listener = filep->private_data; | |
530 | struct uio_device *idev = listener->dev; | |
531 | DECLARE_WAITQUEUE(wait, current); | |
532 | ssize_t retval; | |
533 | s32 event_count; | |
534 | ||
6427a765 | 535 | if (!idev->info->irq) |
beafc54c HK |
536 | return -EIO; |
537 | ||
538 | if (count != sizeof(s32)) | |
539 | return -EINVAL; | |
540 | ||
541 | add_wait_queue(&idev->wait, &wait); | |
542 | ||
543 | do { | |
544 | set_current_state(TASK_INTERRUPTIBLE); | |
545 | ||
546 | event_count = atomic_read(&idev->event); | |
547 | if (event_count != listener->event_count) { | |
548 | if (copy_to_user(buf, &event_count, count)) | |
549 | retval = -EFAULT; | |
550 | else { | |
551 | listener->event_count = event_count; | |
552 | retval = count; | |
553 | } | |
554 | break; | |
555 | } | |
556 | ||
557 | if (filep->f_flags & O_NONBLOCK) { | |
558 | retval = -EAGAIN; | |
559 | break; | |
560 | } | |
561 | ||
562 | if (signal_pending(current)) { | |
563 | retval = -ERESTARTSYS; | |
564 | break; | |
565 | } | |
566 | schedule(); | |
567 | } while (1); | |
568 | ||
569 | __set_current_state(TASK_RUNNING); | |
570 | remove_wait_queue(&idev->wait, &wait); | |
571 | ||
572 | return retval; | |
573 | } | |
574 | ||
328a14e7 HK |
575 | static ssize_t uio_write(struct file *filep, const char __user *buf, |
576 | size_t count, loff_t *ppos) | |
577 | { | |
578 | struct uio_listener *listener = filep->private_data; | |
579 | struct uio_device *idev = listener->dev; | |
580 | ssize_t retval; | |
581 | s32 irq_on; | |
582 | ||
6427a765 | 583 | if (!idev->info->irq) |
328a14e7 HK |
584 | return -EIO; |
585 | ||
586 | if (count != sizeof(s32)) | |
587 | return -EINVAL; | |
588 | ||
589 | if (!idev->info->irqcontrol) | |
590 | return -ENOSYS; | |
591 | ||
592 | if (copy_from_user(&irq_on, buf, count)) | |
593 | return -EFAULT; | |
594 | ||
595 | retval = idev->info->irqcontrol(idev->info, irq_on); | |
596 | ||
597 | return retval ? retval : sizeof(s32); | |
598 | } | |
599 | ||
beafc54c HK |
600 | static int uio_find_mem_index(struct vm_area_struct *vma) |
601 | { | |
602 | int mi; | |
603 | struct uio_device *idev = vma->vm_private_data; | |
604 | ||
605 | for (mi = 0; mi < MAX_UIO_MAPS; mi++) { | |
606 | if (idev->info->mem[mi].size == 0) | |
607 | return -1; | |
608 | if (vma->vm_pgoff == mi) | |
609 | return mi; | |
610 | } | |
611 | return -1; | |
612 | } | |
613 | ||
614 | static void uio_vma_open(struct vm_area_struct *vma) | |
615 | { | |
616 | struct uio_device *idev = vma->vm_private_data; | |
617 | idev->vma_count++; | |
618 | } | |
619 | ||
620 | static void uio_vma_close(struct vm_area_struct *vma) | |
621 | { | |
622 | struct uio_device *idev = vma->vm_private_data; | |
623 | idev->vma_count--; | |
624 | } | |
625 | ||
a18b630d | 626 | static int uio_vma_fault(struct vm_area_struct *vma, struct vm_fault *vmf) |
beafc54c HK |
627 | { |
628 | struct uio_device *idev = vma->vm_private_data; | |
a18b630d | 629 | struct page *page; |
02683ffd | 630 | unsigned long offset; |
beafc54c HK |
631 | |
632 | int mi = uio_find_mem_index(vma); | |
633 | if (mi < 0) | |
a18b630d | 634 | return VM_FAULT_SIGBUS; |
beafc54c | 635 | |
02683ffd AH |
636 | /* |
637 | * We need to subtract mi because userspace uses offset = N*PAGE_SIZE | |
638 | * to use mem[N]. | |
639 | */ | |
640 | offset = (vmf->pgoff - mi) << PAGE_SHIFT; | |
641 | ||
beafc54c | 642 | if (idev->info->mem[mi].memtype == UIO_MEM_LOGICAL) |
02683ffd | 643 | page = virt_to_page(idev->info->mem[mi].addr + offset); |
beafc54c | 644 | else |
02683ffd AH |
645 | page = vmalloc_to_page((void *)idev->info->mem[mi].addr |
646 | + offset); | |
beafc54c | 647 | get_page(page); |
a18b630d NP |
648 | vmf->page = page; |
649 | return 0; | |
beafc54c HK |
650 | } |
651 | ||
f0f37e2f | 652 | static const struct vm_operations_struct uio_vm_ops = { |
beafc54c HK |
653 | .open = uio_vma_open, |
654 | .close = uio_vma_close, | |
a18b630d | 655 | .fault = uio_vma_fault, |
beafc54c HK |
656 | }; |
657 | ||
658 | static int uio_mmap_physical(struct vm_area_struct *vma) | |
659 | { | |
660 | struct uio_device *idev = vma->vm_private_data; | |
661 | int mi = uio_find_mem_index(vma); | |
662 | if (mi < 0) | |
663 | return -EINVAL; | |
664 | ||
665 | vma->vm_flags |= VM_IO | VM_RESERVED; | |
c9698d6b JSC |
666 | |
667 | vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); | |
beafc54c HK |
668 | |
669 | return remap_pfn_range(vma, | |
670 | vma->vm_start, | |
671 | idev->info->mem[mi].addr >> PAGE_SHIFT, | |
672 | vma->vm_end - vma->vm_start, | |
673 | vma->vm_page_prot); | |
674 | } | |
675 | ||
676 | static int uio_mmap_logical(struct vm_area_struct *vma) | |
677 | { | |
678 | vma->vm_flags |= VM_RESERVED; | |
679 | vma->vm_ops = &uio_vm_ops; | |
680 | uio_vma_open(vma); | |
681 | return 0; | |
682 | } | |
683 | ||
684 | static int uio_mmap(struct file *filep, struct vm_area_struct *vma) | |
685 | { | |
686 | struct uio_listener *listener = filep->private_data; | |
687 | struct uio_device *idev = listener->dev; | |
688 | int mi; | |
689 | unsigned long requested_pages, actual_pages; | |
690 | int ret = 0; | |
691 | ||
692 | if (vma->vm_end < vma->vm_start) | |
693 | return -EINVAL; | |
694 | ||
695 | vma->vm_private_data = idev; | |
696 | ||
697 | mi = uio_find_mem_index(vma); | |
698 | if (mi < 0) | |
699 | return -EINVAL; | |
700 | ||
701 | requested_pages = (vma->vm_end - vma->vm_start) >> PAGE_SHIFT; | |
6da2d377 IA |
702 | actual_pages = ((idev->info->mem[mi].addr & ~PAGE_MASK) |
703 | + idev->info->mem[mi].size + PAGE_SIZE -1) >> PAGE_SHIFT; | |
beafc54c HK |
704 | if (requested_pages > actual_pages) |
705 | return -EINVAL; | |
706 | ||
707 | if (idev->info->mmap) { | |
beafc54c | 708 | ret = idev->info->mmap(idev->info, vma); |
beafc54c HK |
709 | return ret; |
710 | } | |
711 | ||
712 | switch (idev->info->mem[mi].memtype) { | |
713 | case UIO_MEM_PHYS: | |
714 | return uio_mmap_physical(vma); | |
715 | case UIO_MEM_LOGICAL: | |
716 | case UIO_MEM_VIRTUAL: | |
717 | return uio_mmap_logical(vma); | |
718 | default: | |
719 | return -EINVAL; | |
720 | } | |
721 | } | |
722 | ||
4f014691 | 723 | static const struct file_operations uio_fops = { |
beafc54c HK |
724 | .owner = THIS_MODULE, |
725 | .open = uio_open, | |
726 | .release = uio_release, | |
727 | .read = uio_read, | |
328a14e7 | 728 | .write = uio_write, |
beafc54c HK |
729 | .mmap = uio_mmap, |
730 | .poll = uio_poll, | |
731 | .fasync = uio_fasync, | |
732 | }; | |
733 | ||
734 | static int uio_major_init(void) | |
735 | { | |
91960a46 EB |
736 | static const char name[] = "uio"; |
737 | struct cdev *cdev = NULL; | |
738 | dev_t uio_dev = 0; | |
739 | int result; | |
740 | ||
741 | result = alloc_chrdev_region(&uio_dev, 0, UIO_MAX_DEVICES, name); | |
742 | if (result) | |
743 | goto out; | |
744 | ||
745 | result = -ENOMEM; | |
746 | cdev = cdev_alloc(); | |
747 | if (!cdev) | |
748 | goto out_unregister; | |
749 | ||
750 | cdev->owner = THIS_MODULE; | |
751 | cdev->ops = &uio_fops; | |
752 | kobject_set_name(&cdev->kobj, "%s", name); | |
753 | ||
754 | result = cdev_add(cdev, uio_dev, UIO_MAX_DEVICES); | |
755 | if (result) | |
756 | goto out_put; | |
757 | ||
758 | uio_major = MAJOR(uio_dev); | |
759 | uio_cdev = cdev; | |
760 | result = 0; | |
761 | out: | |
762 | return result; | |
763 | out_put: | |
764 | kobject_put(&cdev->kobj); | |
765 | out_unregister: | |
766 | unregister_chrdev_region(uio_dev, UIO_MAX_DEVICES); | |
767 | goto out; | |
beafc54c HK |
768 | } |
769 | ||
770 | static void uio_major_cleanup(void) | |
771 | { | |
91960a46 EB |
772 | unregister_chrdev_region(MKDEV(uio_major, 0), UIO_MAX_DEVICES); |
773 | cdev_del(uio_cdev); | |
beafc54c HK |
774 | } |
775 | ||
776 | static int init_uio_class(void) | |
777 | { | |
3d4f9d76 EB |
778 | struct class *class; |
779 | int ret; | |
beafc54c HK |
780 | |
781 | /* This is the first time in here, set everything up properly */ | |
782 | ret = uio_major_init(); | |
783 | if (ret) | |
784 | goto exit; | |
785 | ||
3d4f9d76 EB |
786 | class = class_create(THIS_MODULE, "uio"); |
787 | if (IS_ERR(class)) { | |
788 | ret = IS_ERR(class); | |
beafc54c HK |
789 | printk(KERN_ERR "class_create failed for uio\n"); |
790 | goto err_class_create; | |
791 | } | |
3d4f9d76 | 792 | uio_class = class; |
beafc54c HK |
793 | return 0; |
794 | ||
795 | err_class_create: | |
beafc54c HK |
796 | uio_major_cleanup(); |
797 | exit: | |
798 | return ret; | |
799 | } | |
800 | ||
3d4f9d76 | 801 | static void release_uio_class(void) |
beafc54c HK |
802 | { |
803 | /* Ok, we cheat as we know we only have one uio_class */ | |
3d4f9d76 | 804 | class_destroy(uio_class); |
beafc54c | 805 | uio_class = NULL; |
3d4f9d76 | 806 | uio_major_cleanup(); |
beafc54c HK |
807 | } |
808 | ||
809 | /** | |
810 | * uio_register_device - register a new userspace IO device | |
811 | * @owner: module that creates the new device | |
812 | * @parent: parent device | |
813 | * @info: UIO device capabilities | |
814 | * | |
815 | * returns zero on success or a negative error code. | |
816 | */ | |
817 | int __uio_register_device(struct module *owner, | |
818 | struct device *parent, | |
819 | struct uio_info *info) | |
820 | { | |
821 | struct uio_device *idev; | |
822 | int ret = 0; | |
823 | ||
824 | if (!parent || !info || !info->name || !info->version) | |
825 | return -EINVAL; | |
826 | ||
827 | info->uio_dev = NULL; | |
828 | ||
beafc54c HK |
829 | idev = kzalloc(sizeof(*idev), GFP_KERNEL); |
830 | if (!idev) { | |
831 | ret = -ENOMEM; | |
832 | goto err_kzalloc; | |
833 | } | |
834 | ||
835 | idev->owner = owner; | |
836 | idev->info = info; | |
837 | init_waitqueue_head(&idev->wait); | |
838 | atomic_set(&idev->event, 0); | |
839 | ||
840 | ret = uio_get_minor(idev); | |
841 | if (ret) | |
842 | goto err_get_minor; | |
843 | ||
3d4f9d76 | 844 | idev->dev = device_create(uio_class, parent, |
a9b12619 GKH |
845 | MKDEV(uio_major, idev->minor), idev, |
846 | "uio%d", idev->minor); | |
beafc54c HK |
847 | if (IS_ERR(idev->dev)) { |
848 | printk(KERN_ERR "UIO: device register failed\n"); | |
849 | ret = PTR_ERR(idev->dev); | |
850 | goto err_device_create; | |
851 | } | |
beafc54c HK |
852 | |
853 | ret = uio_dev_add_attributes(idev); | |
854 | if (ret) | |
855 | goto err_uio_dev_add_attributes; | |
856 | ||
857 | info->uio_dev = idev; | |
858 | ||
6427a765 EB |
859 | if (info->irq && (info->irq != UIO_IRQ_CUSTOM)) { |
860 | ret = request_irq(info->irq, uio_interrupt, | |
861 | info->irq_flags, info->name, idev); | |
beafc54c HK |
862 | if (ret) |
863 | goto err_request_irq; | |
864 | } | |
865 | ||
866 | return 0; | |
867 | ||
868 | err_request_irq: | |
869 | uio_dev_del_attributes(idev); | |
870 | err_uio_dev_add_attributes: | |
3d4f9d76 | 871 | device_destroy(uio_class, MKDEV(uio_major, idev->minor)); |
beafc54c HK |
872 | err_device_create: |
873 | uio_free_minor(idev); | |
874 | err_get_minor: | |
875 | kfree(idev); | |
876 | err_kzalloc: | |
beafc54c HK |
877 | return ret; |
878 | } | |
879 | EXPORT_SYMBOL_GPL(__uio_register_device); | |
880 | ||
881 | /** | |
882 | * uio_unregister_device - unregister a industrial IO device | |
883 | * @info: UIO device capabilities | |
884 | * | |
885 | */ | |
886 | void uio_unregister_device(struct uio_info *info) | |
887 | { | |
888 | struct uio_device *idev; | |
889 | ||
890 | if (!info || !info->uio_dev) | |
891 | return; | |
892 | ||
893 | idev = info->uio_dev; | |
894 | ||
895 | uio_free_minor(idev); | |
896 | ||
6427a765 | 897 | if (info->irq && (info->irq != UIO_IRQ_CUSTOM)) |
beafc54c HK |
898 | free_irq(info->irq, idev); |
899 | ||
900 | uio_dev_del_attributes(idev); | |
901 | ||
3d4f9d76 | 902 | device_destroy(uio_class, MKDEV(uio_major, idev->minor)); |
beafc54c | 903 | kfree(idev); |
beafc54c HK |
904 | |
905 | return; | |
906 | } | |
907 | EXPORT_SYMBOL_GPL(uio_unregister_device); | |
908 | ||
909 | static int __init uio_init(void) | |
910 | { | |
3d4f9d76 | 911 | return init_uio_class(); |
beafc54c HK |
912 | } |
913 | ||
914 | static void __exit uio_exit(void) | |
915 | { | |
3d4f9d76 | 916 | release_uio_class(); |
beafc54c HK |
917 | } |
918 | ||
919 | module_init(uio_init) | |
920 | module_exit(uio_exit) | |
921 | MODULE_LICENSE("GPL v2"); |