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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> | |
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> | |
26 | #include <linux/uio_driver.h> | |
27 | ||
28 | #define UIO_MAX_DEVICES 255 | |
29 | ||
30 | struct uio_device { | |
31 | struct module *owner; | |
32 | struct device *dev; | |
33 | int minor; | |
34 | atomic_t event; | |
35 | struct fasync_struct *async_queue; | |
36 | wait_queue_head_t wait; | |
37 | int vma_count; | |
38 | struct uio_info *info; | |
81e7c6a6 | 39 | struct kobject *map_dir; |
e70c412e | 40 | struct kobject *portio_dir; |
beafc54c HK |
41 | }; |
42 | ||
43 | static int uio_major; | |
44 | static DEFINE_IDR(uio_idr); | |
4f014691 | 45 | static const struct file_operations uio_fops; |
beafc54c HK |
46 | |
47 | /* UIO class infrastructure */ | |
3d4f9d76 | 48 | static struct class *uio_class; |
beafc54c | 49 | |
0d4a7bc1 JC |
50 | /* Protect idr accesses */ |
51 | static DEFINE_MUTEX(minor_lock); | |
52 | ||
beafc54c HK |
53 | /* |
54 | * attributes | |
55 | */ | |
56 | ||
81e7c6a6 GKH |
57 | struct uio_map { |
58 | struct kobject kobj; | |
59 | struct uio_mem *mem; | |
beafc54c | 60 | }; |
81e7c6a6 | 61 | #define to_map(map) container_of(map, struct uio_map, kobj) |
beafc54c | 62 | |
82057791 HK |
63 | static ssize_t map_name_show(struct uio_mem *mem, char *buf) |
64 | { | |
65 | if (unlikely(!mem->name)) | |
66 | mem->name = ""; | |
67 | ||
68 | return sprintf(buf, "%s\n", mem->name); | |
69 | } | |
70 | ||
4f808bcd | 71 | static ssize_t map_addr_show(struct uio_mem *mem, char *buf) |
beafc54c | 72 | { |
4f808bcd BP |
73 | return sprintf(buf, "0x%lx\n", mem->addr); |
74 | } | |
beafc54c | 75 | |
4f808bcd BP |
76 | static ssize_t map_size_show(struct uio_mem *mem, char *buf) |
77 | { | |
78 | return sprintf(buf, "0x%lx\n", mem->size); | |
beafc54c HK |
79 | } |
80 | ||
e2b39df1 HK |
81 | static ssize_t map_offset_show(struct uio_mem *mem, char *buf) |
82 | { | |
83 | return sprintf(buf, "0x%lx\n", mem->addr & ~PAGE_MASK); | |
84 | } | |
85 | ||
e70c412e | 86 | struct map_sysfs_entry { |
4f808bcd BP |
87 | struct attribute attr; |
88 | ssize_t (*show)(struct uio_mem *, char *); | |
89 | ssize_t (*store)(struct uio_mem *, const char *, size_t); | |
90 | }; | |
91 | ||
82057791 HK |
92 | static struct map_sysfs_entry name_attribute = |
93 | __ATTR(name, S_IRUGO, map_name_show, NULL); | |
e70c412e | 94 | static struct map_sysfs_entry addr_attribute = |
4f808bcd | 95 | __ATTR(addr, S_IRUGO, map_addr_show, NULL); |
e70c412e | 96 | static struct map_sysfs_entry size_attribute = |
4f808bcd | 97 | __ATTR(size, S_IRUGO, map_size_show, NULL); |
e70c412e | 98 | static struct map_sysfs_entry offset_attribute = |
e2b39df1 | 99 | __ATTR(offset, S_IRUGO, map_offset_show, NULL); |
beafc54c | 100 | |
81e7c6a6 | 101 | static struct attribute *attrs[] = { |
82057791 | 102 | &name_attribute.attr, |
4f808bcd | 103 | &addr_attribute.attr, |
81e7c6a6 | 104 | &size_attribute.attr, |
e2b39df1 | 105 | &offset_attribute.attr, |
81e7c6a6 | 106 | NULL, /* need to NULL terminate the list of attributes */ |
beafc54c HK |
107 | }; |
108 | ||
81e7c6a6 GKH |
109 | static void map_release(struct kobject *kobj) |
110 | { | |
111 | struct uio_map *map = to_map(kobj); | |
112 | kfree(map); | |
113 | } | |
114 | ||
4f808bcd BP |
115 | static ssize_t map_type_show(struct kobject *kobj, struct attribute *attr, |
116 | char *buf) | |
117 | { | |
118 | struct uio_map *map = to_map(kobj); | |
119 | struct uio_mem *mem = map->mem; | |
e70c412e | 120 | struct map_sysfs_entry *entry; |
4f808bcd | 121 | |
e70c412e | 122 | entry = container_of(attr, struct map_sysfs_entry, attr); |
4f808bcd BP |
123 | |
124 | if (!entry->show) | |
125 | return -EIO; | |
126 | ||
127 | return entry->show(mem, buf); | |
128 | } | |
129 | ||
52cf25d0 | 130 | static const struct sysfs_ops map_sysfs_ops = { |
4f808bcd BP |
131 | .show = map_type_show, |
132 | }; | |
133 | ||
beafc54c | 134 | static struct kobj_type map_attr_type = { |
81e7c6a6 | 135 | .release = map_release, |
e70c412e | 136 | .sysfs_ops = &map_sysfs_ops, |
81e7c6a6 | 137 | .default_attrs = attrs, |
beafc54c HK |
138 | }; |
139 | ||
e70c412e HK |
140 | struct uio_portio { |
141 | struct kobject kobj; | |
142 | struct uio_port *port; | |
143 | }; | |
144 | #define to_portio(portio) container_of(portio, struct uio_portio, kobj) | |
145 | ||
82057791 HK |
146 | static ssize_t portio_name_show(struct uio_port *port, char *buf) |
147 | { | |
148 | if (unlikely(!port->name)) | |
149 | port->name = ""; | |
150 | ||
151 | return sprintf(buf, "%s\n", port->name); | |
152 | } | |
153 | ||
e70c412e HK |
154 | static ssize_t portio_start_show(struct uio_port *port, char *buf) |
155 | { | |
156 | return sprintf(buf, "0x%lx\n", port->start); | |
157 | } | |
158 | ||
159 | static ssize_t portio_size_show(struct uio_port *port, char *buf) | |
160 | { | |
161 | return sprintf(buf, "0x%lx\n", port->size); | |
162 | } | |
163 | ||
164 | static ssize_t portio_porttype_show(struct uio_port *port, char *buf) | |
165 | { | |
166 | const char *porttypes[] = {"none", "x86", "gpio", "other"}; | |
167 | ||
168 | if ((port->porttype < 0) || (port->porttype > UIO_PORT_OTHER)) | |
169 | return -EINVAL; | |
170 | ||
171 | return sprintf(buf, "port_%s\n", porttypes[port->porttype]); | |
172 | } | |
173 | ||
174 | struct portio_sysfs_entry { | |
175 | struct attribute attr; | |
176 | ssize_t (*show)(struct uio_port *, char *); | |
177 | ssize_t (*store)(struct uio_port *, const char *, size_t); | |
178 | }; | |
179 | ||
82057791 HK |
180 | static struct portio_sysfs_entry portio_name_attribute = |
181 | __ATTR(name, S_IRUGO, portio_name_show, NULL); | |
e70c412e HK |
182 | static struct portio_sysfs_entry portio_start_attribute = |
183 | __ATTR(start, S_IRUGO, portio_start_show, NULL); | |
184 | static struct portio_sysfs_entry portio_size_attribute = | |
185 | __ATTR(size, S_IRUGO, portio_size_show, NULL); | |
186 | static struct portio_sysfs_entry portio_porttype_attribute = | |
187 | __ATTR(porttype, S_IRUGO, portio_porttype_show, NULL); | |
188 | ||
189 | static struct attribute *portio_attrs[] = { | |
82057791 | 190 | &portio_name_attribute.attr, |
e70c412e HK |
191 | &portio_start_attribute.attr, |
192 | &portio_size_attribute.attr, | |
193 | &portio_porttype_attribute.attr, | |
194 | NULL, | |
195 | }; | |
196 | ||
197 | static void portio_release(struct kobject *kobj) | |
198 | { | |
199 | struct uio_portio *portio = to_portio(kobj); | |
200 | kfree(portio); | |
201 | } | |
202 | ||
203 | static ssize_t portio_type_show(struct kobject *kobj, struct attribute *attr, | |
204 | char *buf) | |
205 | { | |
206 | struct uio_portio *portio = to_portio(kobj); | |
207 | struct uio_port *port = portio->port; | |
208 | struct portio_sysfs_entry *entry; | |
209 | ||
210 | entry = container_of(attr, struct portio_sysfs_entry, attr); | |
211 | ||
212 | if (!entry->show) | |
213 | return -EIO; | |
214 | ||
215 | return entry->show(port, buf); | |
216 | } | |
217 | ||
52cf25d0 | 218 | static const struct sysfs_ops portio_sysfs_ops = { |
e70c412e HK |
219 | .show = portio_type_show, |
220 | }; | |
221 | ||
222 | static struct kobj_type portio_attr_type = { | |
223 | .release = portio_release, | |
224 | .sysfs_ops = &portio_sysfs_ops, | |
225 | .default_attrs = portio_attrs, | |
226 | }; | |
227 | ||
beafc54c HK |
228 | static ssize_t show_name(struct device *dev, |
229 | struct device_attribute *attr, char *buf) | |
230 | { | |
231 | struct uio_device *idev = dev_get_drvdata(dev); | |
70a9156b | 232 | return sprintf(buf, "%s\n", idev->info->name); |
beafc54c HK |
233 | } |
234 | static DEVICE_ATTR(name, S_IRUGO, show_name, NULL); | |
235 | ||
236 | static ssize_t show_version(struct device *dev, | |
237 | struct device_attribute *attr, char *buf) | |
238 | { | |
239 | struct uio_device *idev = dev_get_drvdata(dev); | |
70a9156b | 240 | return sprintf(buf, "%s\n", idev->info->version); |
beafc54c HK |
241 | } |
242 | static DEVICE_ATTR(version, S_IRUGO, show_version, NULL); | |
243 | ||
244 | static ssize_t show_event(struct device *dev, | |
245 | struct device_attribute *attr, char *buf) | |
246 | { | |
247 | struct uio_device *idev = dev_get_drvdata(dev); | |
70a9156b | 248 | return sprintf(buf, "%u\n", (unsigned int)atomic_read(&idev->event)); |
beafc54c HK |
249 | } |
250 | static DEVICE_ATTR(event, S_IRUGO, show_event, NULL); | |
251 | ||
252 | static struct attribute *uio_attrs[] = { | |
253 | &dev_attr_name.attr, | |
254 | &dev_attr_version.attr, | |
255 | &dev_attr_event.attr, | |
256 | NULL, | |
257 | }; | |
258 | ||
259 | static struct attribute_group uio_attr_grp = { | |
260 | .attrs = uio_attrs, | |
261 | }; | |
262 | ||
263 | /* | |
264 | * device functions | |
265 | */ | |
266 | static int uio_dev_add_attributes(struct uio_device *idev) | |
267 | { | |
268 | int ret; | |
e70c412e | 269 | int mi, pi; |
beafc54c | 270 | int map_found = 0; |
e70c412e | 271 | int portio_found = 0; |
beafc54c | 272 | struct uio_mem *mem; |
81e7c6a6 | 273 | struct uio_map *map; |
e70c412e HK |
274 | struct uio_port *port; |
275 | struct uio_portio *portio; | |
beafc54c HK |
276 | |
277 | ret = sysfs_create_group(&idev->dev->kobj, &uio_attr_grp); | |
278 | if (ret) | |
279 | goto err_group; | |
280 | ||
281 | for (mi = 0; mi < MAX_UIO_MAPS; mi++) { | |
282 | mem = &idev->info->mem[mi]; | |
283 | if (mem->size == 0) | |
284 | break; | |
285 | if (!map_found) { | |
286 | map_found = 1; | |
81e7c6a6 GKH |
287 | idev->map_dir = kobject_create_and_add("maps", |
288 | &idev->dev->kobj); | |
289 | if (!idev->map_dir) | |
e70c412e | 290 | goto err_map; |
beafc54c | 291 | } |
81e7c6a6 GKH |
292 | map = kzalloc(sizeof(*map), GFP_KERNEL); |
293 | if (!map) | |
e70c412e | 294 | goto err_map; |
f9cb074b | 295 | kobject_init(&map->kobj, &map_attr_type); |
81e7c6a6 GKH |
296 | map->mem = mem; |
297 | mem->map = map; | |
b2d6db58 | 298 | ret = kobject_add(&map->kobj, idev->map_dir, "map%d", mi); |
81e7c6a6 | 299 | if (ret) |
e70c412e | 300 | goto err_map; |
81e7c6a6 | 301 | ret = kobject_uevent(&map->kobj, KOBJ_ADD); |
beafc54c | 302 | if (ret) |
e70c412e HK |
303 | goto err_map; |
304 | } | |
305 | ||
306 | for (pi = 0; pi < MAX_UIO_PORT_REGIONS; pi++) { | |
307 | port = &idev->info->port[pi]; | |
308 | if (port->size == 0) | |
309 | break; | |
310 | if (!portio_found) { | |
311 | portio_found = 1; | |
312 | idev->portio_dir = kobject_create_and_add("portio", | |
313 | &idev->dev->kobj); | |
314 | if (!idev->portio_dir) | |
315 | goto err_portio; | |
316 | } | |
317 | portio = kzalloc(sizeof(*portio), GFP_KERNEL); | |
318 | if (!portio) | |
319 | goto err_portio; | |
320 | kobject_init(&portio->kobj, &portio_attr_type); | |
321 | portio->port = port; | |
322 | port->portio = portio; | |
323 | ret = kobject_add(&portio->kobj, idev->portio_dir, | |
324 | "port%d", pi); | |
325 | if (ret) | |
326 | goto err_portio; | |
327 | ret = kobject_uevent(&portio->kobj, KOBJ_ADD); | |
328 | if (ret) | |
329 | goto err_portio; | |
beafc54c HK |
330 | } |
331 | ||
332 | return 0; | |
333 | ||
e70c412e HK |
334 | err_portio: |
335 | for (pi--; pi >= 0; pi--) { | |
336 | port = &idev->info->port[pi]; | |
337 | portio = port->portio; | |
338 | kobject_put(&portio->kobj); | |
339 | } | |
340 | kobject_put(idev->portio_dir); | |
341 | err_map: | |
beafc54c HK |
342 | for (mi--; mi>=0; mi--) { |
343 | mem = &idev->info->mem[mi]; | |
81e7c6a6 | 344 | map = mem->map; |
c10997f6 | 345 | kobject_put(&map->kobj); |
beafc54c | 346 | } |
c10997f6 | 347 | kobject_put(idev->map_dir); |
beafc54c HK |
348 | sysfs_remove_group(&idev->dev->kobj, &uio_attr_grp); |
349 | err_group: | |
350 | dev_err(idev->dev, "error creating sysfs files (%d)\n", ret); | |
351 | return ret; | |
352 | } | |
353 | ||
354 | static void uio_dev_del_attributes(struct uio_device *idev) | |
355 | { | |
e70c412e | 356 | int i; |
beafc54c | 357 | struct uio_mem *mem; |
e70c412e HK |
358 | struct uio_port *port; |
359 | ||
360 | for (i = 0; i < MAX_UIO_MAPS; i++) { | |
361 | mem = &idev->info->mem[i]; | |
beafc54c HK |
362 | if (mem->size == 0) |
363 | break; | |
c10997f6 | 364 | kobject_put(&mem->map->kobj); |
beafc54c | 365 | } |
c10997f6 | 366 | kobject_put(idev->map_dir); |
e70c412e HK |
367 | |
368 | for (i = 0; i < MAX_UIO_PORT_REGIONS; i++) { | |
369 | port = &idev->info->port[i]; | |
370 | if (port->size == 0) | |
371 | break; | |
372 | kobject_put(&port->portio->kobj); | |
373 | } | |
374 | kobject_put(idev->portio_dir); | |
375 | ||
beafc54c HK |
376 | sysfs_remove_group(&idev->dev->kobj, &uio_attr_grp); |
377 | } | |
378 | ||
379 | static int uio_get_minor(struct uio_device *idev) | |
380 | { | |
beafc54c HK |
381 | int retval = -ENOMEM; |
382 | int id; | |
383 | ||
384 | mutex_lock(&minor_lock); | |
385 | if (idr_pre_get(&uio_idr, GFP_KERNEL) == 0) | |
386 | goto exit; | |
387 | ||
388 | retval = idr_get_new(&uio_idr, idev, &id); | |
389 | if (retval < 0) { | |
390 | if (retval == -EAGAIN) | |
391 | retval = -ENOMEM; | |
392 | goto exit; | |
393 | } | |
394 | idev->minor = id & MAX_ID_MASK; | |
395 | exit: | |
396 | mutex_unlock(&minor_lock); | |
397 | return retval; | |
398 | } | |
399 | ||
400 | static void uio_free_minor(struct uio_device *idev) | |
401 | { | |
0d4a7bc1 | 402 | mutex_lock(&minor_lock); |
beafc54c | 403 | idr_remove(&uio_idr, idev->minor); |
0d4a7bc1 | 404 | mutex_unlock(&minor_lock); |
beafc54c HK |
405 | } |
406 | ||
407 | /** | |
408 | * uio_event_notify - trigger an interrupt event | |
409 | * @info: UIO device capabilities | |
410 | */ | |
411 | void uio_event_notify(struct uio_info *info) | |
412 | { | |
413 | struct uio_device *idev = info->uio_dev; | |
414 | ||
415 | atomic_inc(&idev->event); | |
416 | wake_up_interruptible(&idev->wait); | |
417 | kill_fasync(&idev->async_queue, SIGIO, POLL_IN); | |
418 | } | |
419 | EXPORT_SYMBOL_GPL(uio_event_notify); | |
420 | ||
421 | /** | |
422 | * uio_interrupt - hardware interrupt handler | |
423 | * @irq: IRQ number, can be UIO_IRQ_CYCLIC for cyclic timer | |
424 | * @dev_id: Pointer to the devices uio_device structure | |
425 | */ | |
426 | static irqreturn_t uio_interrupt(int irq, void *dev_id) | |
427 | { | |
428 | struct uio_device *idev = (struct uio_device *)dev_id; | |
429 | irqreturn_t ret = idev->info->handler(irq, idev->info); | |
430 | ||
431 | if (ret == IRQ_HANDLED) | |
432 | uio_event_notify(idev->info); | |
433 | ||
434 | return ret; | |
435 | } | |
436 | ||
437 | struct uio_listener { | |
438 | struct uio_device *dev; | |
439 | s32 event_count; | |
440 | }; | |
441 | ||
442 | static int uio_open(struct inode *inode, struct file *filep) | |
443 | { | |
444 | struct uio_device *idev; | |
445 | struct uio_listener *listener; | |
446 | int ret = 0; | |
447 | ||
0d4a7bc1 | 448 | mutex_lock(&minor_lock); |
beafc54c | 449 | idev = idr_find(&uio_idr, iminor(inode)); |
0d4a7bc1 | 450 | mutex_unlock(&minor_lock); |
fbc8a81d JC |
451 | if (!idev) { |
452 | ret = -ENODEV; | |
453 | goto out; | |
454 | } | |
beafc54c | 455 | |
fbc8a81d JC |
456 | if (!try_module_get(idev->owner)) { |
457 | ret = -ENODEV; | |
458 | goto out; | |
459 | } | |
610ad506 | 460 | |
beafc54c | 461 | listener = kmalloc(sizeof(*listener), GFP_KERNEL); |
610ad506 UKK |
462 | if (!listener) { |
463 | ret = -ENOMEM; | |
464 | goto err_alloc_listener; | |
465 | } | |
beafc54c HK |
466 | |
467 | listener->dev = idev; | |
468 | listener->event_count = atomic_read(&idev->event); | |
469 | filep->private_data = listener; | |
470 | ||
471 | if (idev->info->open) { | |
beafc54c | 472 | ret = idev->info->open(idev->info, inode); |
610ad506 UKK |
473 | if (ret) |
474 | goto err_infoopen; | |
beafc54c | 475 | } |
610ad506 UKK |
476 | return 0; |
477 | ||
478 | err_infoopen: | |
610ad506 | 479 | kfree(listener); |
610ad506 | 480 | |
0d4a7bc1 | 481 | err_alloc_listener: |
610ad506 | 482 | module_put(idev->owner); |
beafc54c | 483 | |
fbc8a81d | 484 | out: |
beafc54c HK |
485 | return ret; |
486 | } | |
487 | ||
488 | static int uio_fasync(int fd, struct file *filep, int on) | |
489 | { | |
490 | struct uio_listener *listener = filep->private_data; | |
491 | struct uio_device *idev = listener->dev; | |
492 | ||
493 | return fasync_helper(fd, filep, on, &idev->async_queue); | |
494 | } | |
495 | ||
496 | static int uio_release(struct inode *inode, struct file *filep) | |
497 | { | |
498 | int ret = 0; | |
499 | struct uio_listener *listener = filep->private_data; | |
500 | struct uio_device *idev = listener->dev; | |
501 | ||
610ad506 | 502 | if (idev->info->release) |
beafc54c | 503 | ret = idev->info->release(idev->info, inode); |
610ad506 UKK |
504 | |
505 | module_put(idev->owner); | |
beafc54c HK |
506 | kfree(listener); |
507 | return ret; | |
508 | } | |
509 | ||
510 | static unsigned int uio_poll(struct file *filep, poll_table *wait) | |
511 | { | |
512 | struct uio_listener *listener = filep->private_data; | |
513 | struct uio_device *idev = listener->dev; | |
514 | ||
6427a765 | 515 | if (!idev->info->irq) |
beafc54c HK |
516 | return -EIO; |
517 | ||
518 | poll_wait(filep, &idev->wait, wait); | |
519 | if (listener->event_count != atomic_read(&idev->event)) | |
520 | return POLLIN | POLLRDNORM; | |
521 | return 0; | |
522 | } | |
523 | ||
524 | static ssize_t uio_read(struct file *filep, char __user *buf, | |
525 | size_t count, loff_t *ppos) | |
526 | { | |
527 | struct uio_listener *listener = filep->private_data; | |
528 | struct uio_device *idev = listener->dev; | |
529 | DECLARE_WAITQUEUE(wait, current); | |
530 | ssize_t retval; | |
531 | s32 event_count; | |
532 | ||
6427a765 | 533 | if (!idev->info->irq) |
beafc54c HK |
534 | return -EIO; |
535 | ||
536 | if (count != sizeof(s32)) | |
537 | return -EINVAL; | |
538 | ||
539 | add_wait_queue(&idev->wait, &wait); | |
540 | ||
541 | do { | |
542 | set_current_state(TASK_INTERRUPTIBLE); | |
543 | ||
544 | event_count = atomic_read(&idev->event); | |
545 | if (event_count != listener->event_count) { | |
546 | if (copy_to_user(buf, &event_count, count)) | |
547 | retval = -EFAULT; | |
548 | else { | |
549 | listener->event_count = event_count; | |
550 | retval = count; | |
551 | } | |
552 | break; | |
553 | } | |
554 | ||
555 | if (filep->f_flags & O_NONBLOCK) { | |
556 | retval = -EAGAIN; | |
557 | break; | |
558 | } | |
559 | ||
560 | if (signal_pending(current)) { | |
561 | retval = -ERESTARTSYS; | |
562 | break; | |
563 | } | |
564 | schedule(); | |
565 | } while (1); | |
566 | ||
567 | __set_current_state(TASK_RUNNING); | |
568 | remove_wait_queue(&idev->wait, &wait); | |
569 | ||
570 | return retval; | |
571 | } | |
572 | ||
328a14e7 HK |
573 | static ssize_t uio_write(struct file *filep, const char __user *buf, |
574 | size_t count, loff_t *ppos) | |
575 | { | |
576 | struct uio_listener *listener = filep->private_data; | |
577 | struct uio_device *idev = listener->dev; | |
578 | ssize_t retval; | |
579 | s32 irq_on; | |
580 | ||
6427a765 | 581 | if (!idev->info->irq) |
328a14e7 HK |
582 | return -EIO; |
583 | ||
584 | if (count != sizeof(s32)) | |
585 | return -EINVAL; | |
586 | ||
587 | if (!idev->info->irqcontrol) | |
588 | return -ENOSYS; | |
589 | ||
590 | if (copy_from_user(&irq_on, buf, count)) | |
591 | return -EFAULT; | |
592 | ||
593 | retval = idev->info->irqcontrol(idev->info, irq_on); | |
594 | ||
595 | return retval ? retval : sizeof(s32); | |
596 | } | |
597 | ||
beafc54c HK |
598 | static int uio_find_mem_index(struct vm_area_struct *vma) |
599 | { | |
600 | int mi; | |
601 | struct uio_device *idev = vma->vm_private_data; | |
602 | ||
603 | for (mi = 0; mi < MAX_UIO_MAPS; mi++) { | |
604 | if (idev->info->mem[mi].size == 0) | |
605 | return -1; | |
606 | if (vma->vm_pgoff == mi) | |
607 | return mi; | |
608 | } | |
609 | return -1; | |
610 | } | |
611 | ||
612 | static void uio_vma_open(struct vm_area_struct *vma) | |
613 | { | |
614 | struct uio_device *idev = vma->vm_private_data; | |
615 | idev->vma_count++; | |
616 | } | |
617 | ||
618 | static void uio_vma_close(struct vm_area_struct *vma) | |
619 | { | |
620 | struct uio_device *idev = vma->vm_private_data; | |
621 | idev->vma_count--; | |
622 | } | |
623 | ||
a18b630d | 624 | static int uio_vma_fault(struct vm_area_struct *vma, struct vm_fault *vmf) |
beafc54c HK |
625 | { |
626 | struct uio_device *idev = vma->vm_private_data; | |
a18b630d | 627 | struct page *page; |
02683ffd | 628 | unsigned long offset; |
beafc54c HK |
629 | |
630 | int mi = uio_find_mem_index(vma); | |
631 | if (mi < 0) | |
a18b630d | 632 | return VM_FAULT_SIGBUS; |
beafc54c | 633 | |
02683ffd AH |
634 | /* |
635 | * We need to subtract mi because userspace uses offset = N*PAGE_SIZE | |
636 | * to use mem[N]. | |
637 | */ | |
638 | offset = (vmf->pgoff - mi) << PAGE_SHIFT; | |
639 | ||
beafc54c | 640 | if (idev->info->mem[mi].memtype == UIO_MEM_LOGICAL) |
02683ffd | 641 | page = virt_to_page(idev->info->mem[mi].addr + offset); |
beafc54c | 642 | else |
02683ffd AH |
643 | page = vmalloc_to_page((void *)idev->info->mem[mi].addr |
644 | + offset); | |
beafc54c | 645 | get_page(page); |
a18b630d NP |
646 | vmf->page = page; |
647 | return 0; | |
beafc54c HK |
648 | } |
649 | ||
f0f37e2f | 650 | static const struct vm_operations_struct uio_vm_ops = { |
beafc54c HK |
651 | .open = uio_vma_open, |
652 | .close = uio_vma_close, | |
a18b630d | 653 | .fault = uio_vma_fault, |
beafc54c HK |
654 | }; |
655 | ||
656 | static int uio_mmap_physical(struct vm_area_struct *vma) | |
657 | { | |
658 | struct uio_device *idev = vma->vm_private_data; | |
659 | int mi = uio_find_mem_index(vma); | |
660 | if (mi < 0) | |
661 | return -EINVAL; | |
662 | ||
663 | vma->vm_flags |= VM_IO | VM_RESERVED; | |
c9698d6b JSC |
664 | |
665 | vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); | |
beafc54c HK |
666 | |
667 | return remap_pfn_range(vma, | |
668 | vma->vm_start, | |
669 | idev->info->mem[mi].addr >> PAGE_SHIFT, | |
670 | vma->vm_end - vma->vm_start, | |
671 | vma->vm_page_prot); | |
672 | } | |
673 | ||
674 | static int uio_mmap_logical(struct vm_area_struct *vma) | |
675 | { | |
676 | vma->vm_flags |= VM_RESERVED; | |
677 | vma->vm_ops = &uio_vm_ops; | |
678 | uio_vma_open(vma); | |
679 | return 0; | |
680 | } | |
681 | ||
682 | static int uio_mmap(struct file *filep, struct vm_area_struct *vma) | |
683 | { | |
684 | struct uio_listener *listener = filep->private_data; | |
685 | struct uio_device *idev = listener->dev; | |
686 | int mi; | |
687 | unsigned long requested_pages, actual_pages; | |
688 | int ret = 0; | |
689 | ||
690 | if (vma->vm_end < vma->vm_start) | |
691 | return -EINVAL; | |
692 | ||
693 | vma->vm_private_data = idev; | |
694 | ||
695 | mi = uio_find_mem_index(vma); | |
696 | if (mi < 0) | |
697 | return -EINVAL; | |
698 | ||
699 | requested_pages = (vma->vm_end - vma->vm_start) >> PAGE_SHIFT; | |
6da2d377 IA |
700 | actual_pages = ((idev->info->mem[mi].addr & ~PAGE_MASK) |
701 | + idev->info->mem[mi].size + PAGE_SIZE -1) >> PAGE_SHIFT; | |
beafc54c HK |
702 | if (requested_pages > actual_pages) |
703 | return -EINVAL; | |
704 | ||
705 | if (idev->info->mmap) { | |
beafc54c | 706 | ret = idev->info->mmap(idev->info, vma); |
beafc54c HK |
707 | return ret; |
708 | } | |
709 | ||
710 | switch (idev->info->mem[mi].memtype) { | |
711 | case UIO_MEM_PHYS: | |
712 | return uio_mmap_physical(vma); | |
713 | case UIO_MEM_LOGICAL: | |
714 | case UIO_MEM_VIRTUAL: | |
715 | return uio_mmap_logical(vma); | |
716 | default: | |
717 | return -EINVAL; | |
718 | } | |
719 | } | |
720 | ||
4f014691 | 721 | static const struct file_operations uio_fops = { |
beafc54c HK |
722 | .owner = THIS_MODULE, |
723 | .open = uio_open, | |
724 | .release = uio_release, | |
725 | .read = uio_read, | |
328a14e7 | 726 | .write = uio_write, |
beafc54c HK |
727 | .mmap = uio_mmap, |
728 | .poll = uio_poll, | |
729 | .fasync = uio_fasync, | |
730 | }; | |
731 | ||
732 | static int uio_major_init(void) | |
733 | { | |
734 | uio_major = register_chrdev(0, "uio", &uio_fops); | |
735 | if (uio_major < 0) | |
736 | return uio_major; | |
737 | return 0; | |
738 | } | |
739 | ||
740 | static void uio_major_cleanup(void) | |
741 | { | |
742 | unregister_chrdev(uio_major, "uio"); | |
743 | } | |
744 | ||
745 | static int init_uio_class(void) | |
746 | { | |
3d4f9d76 EB |
747 | struct class *class; |
748 | int ret; | |
beafc54c HK |
749 | |
750 | /* This is the first time in here, set everything up properly */ | |
751 | ret = uio_major_init(); | |
752 | if (ret) | |
753 | goto exit; | |
754 | ||
3d4f9d76 EB |
755 | class = class_create(THIS_MODULE, "uio"); |
756 | if (IS_ERR(class)) { | |
757 | ret = IS_ERR(class); | |
beafc54c HK |
758 | printk(KERN_ERR "class_create failed for uio\n"); |
759 | goto err_class_create; | |
760 | } | |
3d4f9d76 | 761 | uio_class = class; |
beafc54c HK |
762 | return 0; |
763 | ||
764 | err_class_create: | |
beafc54c HK |
765 | uio_major_cleanup(); |
766 | exit: | |
767 | return ret; | |
768 | } | |
769 | ||
3d4f9d76 | 770 | static void release_uio_class(void) |
beafc54c HK |
771 | { |
772 | /* Ok, we cheat as we know we only have one uio_class */ | |
3d4f9d76 | 773 | class_destroy(uio_class); |
beafc54c | 774 | uio_class = NULL; |
3d4f9d76 | 775 | uio_major_cleanup(); |
beafc54c HK |
776 | } |
777 | ||
778 | /** | |
779 | * uio_register_device - register a new userspace IO device | |
780 | * @owner: module that creates the new device | |
781 | * @parent: parent device | |
782 | * @info: UIO device capabilities | |
783 | * | |
784 | * returns zero on success or a negative error code. | |
785 | */ | |
786 | int __uio_register_device(struct module *owner, | |
787 | struct device *parent, | |
788 | struct uio_info *info) | |
789 | { | |
790 | struct uio_device *idev; | |
791 | int ret = 0; | |
792 | ||
793 | if (!parent || !info || !info->name || !info->version) | |
794 | return -EINVAL; | |
795 | ||
796 | info->uio_dev = NULL; | |
797 | ||
beafc54c HK |
798 | idev = kzalloc(sizeof(*idev), GFP_KERNEL); |
799 | if (!idev) { | |
800 | ret = -ENOMEM; | |
801 | goto err_kzalloc; | |
802 | } | |
803 | ||
804 | idev->owner = owner; | |
805 | idev->info = info; | |
806 | init_waitqueue_head(&idev->wait); | |
807 | atomic_set(&idev->event, 0); | |
808 | ||
809 | ret = uio_get_minor(idev); | |
810 | if (ret) | |
811 | goto err_get_minor; | |
812 | ||
3d4f9d76 | 813 | idev->dev = device_create(uio_class, parent, |
a9b12619 GKH |
814 | MKDEV(uio_major, idev->minor), idev, |
815 | "uio%d", idev->minor); | |
beafc54c HK |
816 | if (IS_ERR(idev->dev)) { |
817 | printk(KERN_ERR "UIO: device register failed\n"); | |
818 | ret = PTR_ERR(idev->dev); | |
819 | goto err_device_create; | |
820 | } | |
beafc54c HK |
821 | |
822 | ret = uio_dev_add_attributes(idev); | |
823 | if (ret) | |
824 | goto err_uio_dev_add_attributes; | |
825 | ||
826 | info->uio_dev = idev; | |
827 | ||
6427a765 EB |
828 | if (info->irq && (info->irq != UIO_IRQ_CUSTOM)) { |
829 | ret = request_irq(info->irq, uio_interrupt, | |
830 | info->irq_flags, info->name, idev); | |
beafc54c HK |
831 | if (ret) |
832 | goto err_request_irq; | |
833 | } | |
834 | ||
835 | return 0; | |
836 | ||
837 | err_request_irq: | |
838 | uio_dev_del_attributes(idev); | |
839 | err_uio_dev_add_attributes: | |
3d4f9d76 | 840 | device_destroy(uio_class, MKDEV(uio_major, idev->minor)); |
beafc54c HK |
841 | err_device_create: |
842 | uio_free_minor(idev); | |
843 | err_get_minor: | |
844 | kfree(idev); | |
845 | err_kzalloc: | |
beafc54c HK |
846 | return ret; |
847 | } | |
848 | EXPORT_SYMBOL_GPL(__uio_register_device); | |
849 | ||
850 | /** | |
851 | * uio_unregister_device - unregister a industrial IO device | |
852 | * @info: UIO device capabilities | |
853 | * | |
854 | */ | |
855 | void uio_unregister_device(struct uio_info *info) | |
856 | { | |
857 | struct uio_device *idev; | |
858 | ||
859 | if (!info || !info->uio_dev) | |
860 | return; | |
861 | ||
862 | idev = info->uio_dev; | |
863 | ||
864 | uio_free_minor(idev); | |
865 | ||
6427a765 | 866 | if (info->irq && (info->irq != UIO_IRQ_CUSTOM)) |
beafc54c HK |
867 | free_irq(info->irq, idev); |
868 | ||
869 | uio_dev_del_attributes(idev); | |
870 | ||
3d4f9d76 | 871 | device_destroy(uio_class, MKDEV(uio_major, idev->minor)); |
beafc54c | 872 | kfree(idev); |
beafc54c HK |
873 | |
874 | return; | |
875 | } | |
876 | EXPORT_SYMBOL_GPL(uio_unregister_device); | |
877 | ||
878 | static int __init uio_init(void) | |
879 | { | |
3d4f9d76 | 880 | return init_uio_class(); |
beafc54c HK |
881 | } |
882 | ||
883 | static void __exit uio_exit(void) | |
884 | { | |
3d4f9d76 | 885 | release_uio_class(); |
beafc54c HK |
886 | } |
887 | ||
888 | module_init(uio_init) | |
889 | module_exit(uio_exit) | |
890 | MODULE_LICENSE("GPL v2"); |