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> | |
318af55d | 6 | * Copyright(C) 2006, Hans J. Koch <hjk@hansjkoch.de> |
beafc54c HK |
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 | 30 | |
beafc54c | 31 | static int uio_major; |
91960a46 | 32 | static struct cdev *uio_cdev; |
beafc54c | 33 | static DEFINE_IDR(uio_idr); |
4f014691 | 34 | static const struct file_operations uio_fops; |
beafc54c | 35 | |
0d4a7bc1 JC |
36 | /* Protect idr accesses */ |
37 | static DEFINE_MUTEX(minor_lock); | |
38 | ||
beafc54c HK |
39 | /* |
40 | * attributes | |
41 | */ | |
42 | ||
81e7c6a6 GKH |
43 | struct uio_map { |
44 | struct kobject kobj; | |
45 | struct uio_mem *mem; | |
beafc54c | 46 | }; |
81e7c6a6 | 47 | #define to_map(map) container_of(map, struct uio_map, kobj) |
beafc54c | 48 | |
82057791 HK |
49 | static ssize_t map_name_show(struct uio_mem *mem, char *buf) |
50 | { | |
51 | if (unlikely(!mem->name)) | |
52 | mem->name = ""; | |
53 | ||
54 | return sprintf(buf, "%s\n", mem->name); | |
55 | } | |
56 | ||
4f808bcd | 57 | static ssize_t map_addr_show(struct uio_mem *mem, char *buf) |
beafc54c | 58 | { |
e0f1147c | 59 | return sprintf(buf, "%pa\n", &mem->addr); |
4f808bcd | 60 | } |
beafc54c | 61 | |
4f808bcd BP |
62 | static ssize_t map_size_show(struct uio_mem *mem, char *buf) |
63 | { | |
e0f1147c | 64 | return sprintf(buf, "%pa\n", &mem->size); |
beafc54c HK |
65 | } |
66 | ||
e2b39df1 HK |
67 | static ssize_t map_offset_show(struct uio_mem *mem, char *buf) |
68 | { | |
27a90700 | 69 | return sprintf(buf, "0x%llx\n", (unsigned long long)mem->addr & ~PAGE_MASK); |
e2b39df1 HK |
70 | } |
71 | ||
e70c412e | 72 | struct map_sysfs_entry { |
4f808bcd BP |
73 | struct attribute attr; |
74 | ssize_t (*show)(struct uio_mem *, char *); | |
75 | ssize_t (*store)(struct uio_mem *, const char *, size_t); | |
76 | }; | |
77 | ||
82057791 HK |
78 | static struct map_sysfs_entry name_attribute = |
79 | __ATTR(name, S_IRUGO, map_name_show, NULL); | |
e70c412e | 80 | static struct map_sysfs_entry addr_attribute = |
4f808bcd | 81 | __ATTR(addr, S_IRUGO, map_addr_show, NULL); |
e70c412e | 82 | static struct map_sysfs_entry size_attribute = |
4f808bcd | 83 | __ATTR(size, S_IRUGO, map_size_show, NULL); |
e70c412e | 84 | static struct map_sysfs_entry offset_attribute = |
e2b39df1 | 85 | __ATTR(offset, S_IRUGO, map_offset_show, NULL); |
beafc54c | 86 | |
81e7c6a6 | 87 | static struct attribute *attrs[] = { |
82057791 | 88 | &name_attribute.attr, |
4f808bcd | 89 | &addr_attribute.attr, |
81e7c6a6 | 90 | &size_attribute.attr, |
e2b39df1 | 91 | &offset_attribute.attr, |
81e7c6a6 | 92 | NULL, /* need to NULL terminate the list of attributes */ |
beafc54c HK |
93 | }; |
94 | ||
81e7c6a6 GKH |
95 | static void map_release(struct kobject *kobj) |
96 | { | |
97 | struct uio_map *map = to_map(kobj); | |
98 | kfree(map); | |
99 | } | |
100 | ||
4f808bcd BP |
101 | static ssize_t map_type_show(struct kobject *kobj, struct attribute *attr, |
102 | char *buf) | |
103 | { | |
104 | struct uio_map *map = to_map(kobj); | |
105 | struct uio_mem *mem = map->mem; | |
e70c412e | 106 | struct map_sysfs_entry *entry; |
4f808bcd | 107 | |
e70c412e | 108 | entry = container_of(attr, struct map_sysfs_entry, attr); |
4f808bcd BP |
109 | |
110 | if (!entry->show) | |
111 | return -EIO; | |
112 | ||
113 | return entry->show(mem, buf); | |
114 | } | |
115 | ||
52cf25d0 | 116 | static const struct sysfs_ops map_sysfs_ops = { |
4f808bcd BP |
117 | .show = map_type_show, |
118 | }; | |
119 | ||
beafc54c | 120 | static struct kobj_type map_attr_type = { |
81e7c6a6 | 121 | .release = map_release, |
e70c412e | 122 | .sysfs_ops = &map_sysfs_ops, |
81e7c6a6 | 123 | .default_attrs = attrs, |
beafc54c HK |
124 | }; |
125 | ||
e70c412e HK |
126 | struct uio_portio { |
127 | struct kobject kobj; | |
128 | struct uio_port *port; | |
129 | }; | |
130 | #define to_portio(portio) container_of(portio, struct uio_portio, kobj) | |
131 | ||
82057791 HK |
132 | static ssize_t portio_name_show(struct uio_port *port, char *buf) |
133 | { | |
134 | if (unlikely(!port->name)) | |
135 | port->name = ""; | |
136 | ||
137 | return sprintf(buf, "%s\n", port->name); | |
138 | } | |
139 | ||
e70c412e HK |
140 | static ssize_t portio_start_show(struct uio_port *port, char *buf) |
141 | { | |
142 | return sprintf(buf, "0x%lx\n", port->start); | |
143 | } | |
144 | ||
145 | static ssize_t portio_size_show(struct uio_port *port, char *buf) | |
146 | { | |
147 | return sprintf(buf, "0x%lx\n", port->size); | |
148 | } | |
149 | ||
150 | static ssize_t portio_porttype_show(struct uio_port *port, char *buf) | |
151 | { | |
152 | const char *porttypes[] = {"none", "x86", "gpio", "other"}; | |
153 | ||
154 | if ((port->porttype < 0) || (port->porttype > UIO_PORT_OTHER)) | |
155 | return -EINVAL; | |
156 | ||
157 | return sprintf(buf, "port_%s\n", porttypes[port->porttype]); | |
158 | } | |
159 | ||
160 | struct portio_sysfs_entry { | |
161 | struct attribute attr; | |
162 | ssize_t (*show)(struct uio_port *, char *); | |
163 | ssize_t (*store)(struct uio_port *, const char *, size_t); | |
164 | }; | |
165 | ||
82057791 HK |
166 | static struct portio_sysfs_entry portio_name_attribute = |
167 | __ATTR(name, S_IRUGO, portio_name_show, NULL); | |
e70c412e HK |
168 | static struct portio_sysfs_entry portio_start_attribute = |
169 | __ATTR(start, S_IRUGO, portio_start_show, NULL); | |
170 | static struct portio_sysfs_entry portio_size_attribute = | |
171 | __ATTR(size, S_IRUGO, portio_size_show, NULL); | |
172 | static struct portio_sysfs_entry portio_porttype_attribute = | |
173 | __ATTR(porttype, S_IRUGO, portio_porttype_show, NULL); | |
174 | ||
175 | static struct attribute *portio_attrs[] = { | |
82057791 | 176 | &portio_name_attribute.attr, |
e70c412e HK |
177 | &portio_start_attribute.attr, |
178 | &portio_size_attribute.attr, | |
179 | &portio_porttype_attribute.attr, | |
180 | NULL, | |
181 | }; | |
182 | ||
183 | static void portio_release(struct kobject *kobj) | |
184 | { | |
185 | struct uio_portio *portio = to_portio(kobj); | |
186 | kfree(portio); | |
187 | } | |
188 | ||
189 | static ssize_t portio_type_show(struct kobject *kobj, struct attribute *attr, | |
190 | char *buf) | |
191 | { | |
192 | struct uio_portio *portio = to_portio(kobj); | |
193 | struct uio_port *port = portio->port; | |
194 | struct portio_sysfs_entry *entry; | |
195 | ||
196 | entry = container_of(attr, struct portio_sysfs_entry, attr); | |
197 | ||
198 | if (!entry->show) | |
199 | return -EIO; | |
200 | ||
201 | return entry->show(port, buf); | |
202 | } | |
203 | ||
52cf25d0 | 204 | static const struct sysfs_ops portio_sysfs_ops = { |
e70c412e HK |
205 | .show = portio_type_show, |
206 | }; | |
207 | ||
208 | static struct kobj_type portio_attr_type = { | |
209 | .release = portio_release, | |
210 | .sysfs_ops = &portio_sysfs_ops, | |
211 | .default_attrs = portio_attrs, | |
212 | }; | |
213 | ||
c9dce927 | 214 | static ssize_t name_show(struct device *dev, |
beafc54c HK |
215 | struct device_attribute *attr, char *buf) |
216 | { | |
217 | struct uio_device *idev = dev_get_drvdata(dev); | |
70a9156b | 218 | return sprintf(buf, "%s\n", idev->info->name); |
beafc54c | 219 | } |
c9dce927 | 220 | static DEVICE_ATTR_RO(name); |
beafc54c | 221 | |
c9dce927 | 222 | static ssize_t version_show(struct device *dev, |
beafc54c HK |
223 | struct device_attribute *attr, char *buf) |
224 | { | |
225 | struct uio_device *idev = dev_get_drvdata(dev); | |
70a9156b | 226 | return sprintf(buf, "%s\n", idev->info->version); |
beafc54c | 227 | } |
c9dce927 | 228 | static DEVICE_ATTR_RO(version); |
beafc54c | 229 | |
c9dce927 | 230 | static ssize_t event_show(struct device *dev, |
beafc54c HK |
231 | struct device_attribute *attr, char *buf) |
232 | { | |
233 | struct uio_device *idev = dev_get_drvdata(dev); | |
70a9156b | 234 | return sprintf(buf, "%u\n", (unsigned int)atomic_read(&idev->event)); |
beafc54c | 235 | } |
c9dce927 | 236 | static DEVICE_ATTR_RO(event); |
beafc54c | 237 | |
c9dce927 GKH |
238 | static struct attribute *uio_attrs[] = { |
239 | &dev_attr_name.attr, | |
240 | &dev_attr_version.attr, | |
241 | &dev_attr_event.attr, | |
242 | NULL, | |
beafc54c | 243 | }; |
c9dce927 | 244 | ATTRIBUTE_GROUPS(uio); |
beafc54c | 245 | |
c66fdab6 EB |
246 | /* UIO class infrastructure */ |
247 | static struct class uio_class = { | |
248 | .name = "uio", | |
c9dce927 | 249 | .dev_groups = uio_groups, |
beafc54c HK |
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 | 265 | |
beafc54c HK |
266 | for (mi = 0; mi < MAX_UIO_MAPS; mi++) { |
267 | mem = &idev->info->mem[mi]; | |
268 | if (mem->size == 0) | |
269 | break; | |
270 | if (!map_found) { | |
271 | map_found = 1; | |
81e7c6a6 GKH |
272 | idev->map_dir = kobject_create_and_add("maps", |
273 | &idev->dev->kobj); | |
274 | if (!idev->map_dir) | |
e70c412e | 275 | goto err_map; |
beafc54c | 276 | } |
81e7c6a6 GKH |
277 | map = kzalloc(sizeof(*map), GFP_KERNEL); |
278 | if (!map) | |
75f0aef6 | 279 | goto err_map_kobj; |
f9cb074b | 280 | kobject_init(&map->kobj, &map_attr_type); |
81e7c6a6 GKH |
281 | map->mem = mem; |
282 | mem->map = map; | |
b2d6db58 | 283 | ret = kobject_add(&map->kobj, idev->map_dir, "map%d", mi); |
81e7c6a6 | 284 | if (ret) |
75f0aef6 | 285 | goto err_map_kobj; |
81e7c6a6 | 286 | ret = kobject_uevent(&map->kobj, KOBJ_ADD); |
beafc54c | 287 | if (ret) |
e70c412e HK |
288 | goto err_map; |
289 | } | |
290 | ||
291 | for (pi = 0; pi < MAX_UIO_PORT_REGIONS; pi++) { | |
292 | port = &idev->info->port[pi]; | |
293 | if (port->size == 0) | |
294 | break; | |
295 | if (!portio_found) { | |
296 | portio_found = 1; | |
297 | idev->portio_dir = kobject_create_and_add("portio", | |
298 | &idev->dev->kobj); | |
299 | if (!idev->portio_dir) | |
300 | goto err_portio; | |
301 | } | |
302 | portio = kzalloc(sizeof(*portio), GFP_KERNEL); | |
303 | if (!portio) | |
75f0aef6 | 304 | goto err_portio_kobj; |
e70c412e HK |
305 | kobject_init(&portio->kobj, &portio_attr_type); |
306 | portio->port = port; | |
307 | port->portio = portio; | |
308 | ret = kobject_add(&portio->kobj, idev->portio_dir, | |
309 | "port%d", pi); | |
310 | if (ret) | |
75f0aef6 | 311 | goto err_portio_kobj; |
e70c412e HK |
312 | ret = kobject_uevent(&portio->kobj, KOBJ_ADD); |
313 | if (ret) | |
314 | goto err_portio; | |
beafc54c HK |
315 | } |
316 | ||
317 | return 0; | |
318 | ||
e70c412e | 319 | err_portio: |
75f0aef6 CD |
320 | pi--; |
321 | err_portio_kobj: | |
322 | for (; pi >= 0; pi--) { | |
e70c412e HK |
323 | port = &idev->info->port[pi]; |
324 | portio = port->portio; | |
325 | kobject_put(&portio->kobj); | |
326 | } | |
327 | kobject_put(idev->portio_dir); | |
328 | err_map: | |
75f0aef6 CD |
329 | mi--; |
330 | err_map_kobj: | |
331 | for (; mi >= 0; mi--) { | |
beafc54c | 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 | dev_err(idev->dev, "error creating sysfs files (%d)\n", ret); |
338 | return ret; | |
339 | } | |
340 | ||
341 | static void uio_dev_del_attributes(struct uio_device *idev) | |
342 | { | |
e70c412e | 343 | int i; |
beafc54c | 344 | struct uio_mem *mem; |
e70c412e HK |
345 | struct uio_port *port; |
346 | ||
347 | for (i = 0; i < MAX_UIO_MAPS; i++) { | |
348 | mem = &idev->info->mem[i]; | |
beafc54c HK |
349 | if (mem->size == 0) |
350 | break; | |
c10997f6 | 351 | kobject_put(&mem->map->kobj); |
beafc54c | 352 | } |
c10997f6 | 353 | kobject_put(idev->map_dir); |
e70c412e HK |
354 | |
355 | for (i = 0; i < MAX_UIO_PORT_REGIONS; i++) { | |
356 | port = &idev->info->port[i]; | |
357 | if (port->size == 0) | |
358 | break; | |
359 | kobject_put(&port->portio->kobj); | |
360 | } | |
361 | kobject_put(idev->portio_dir); | |
beafc54c HK |
362 | } |
363 | ||
364 | static int uio_get_minor(struct uio_device *idev) | |
365 | { | |
beafc54c | 366 | int retval = -ENOMEM; |
beafc54c HK |
367 | |
368 | mutex_lock(&minor_lock); | |
6d770931 TH |
369 | retval = idr_alloc(&uio_idr, idev, 0, UIO_MAX_DEVICES, GFP_KERNEL); |
370 | if (retval >= 0) { | |
371 | idev->minor = retval; | |
5ed0505c | 372 | retval = 0; |
6d770931 | 373 | } else if (retval == -ENOSPC) { |
c6edc42f HD |
374 | dev_err(idev->dev, "too many uio devices\n"); |
375 | retval = -EINVAL; | |
c6edc42f | 376 | } |
beafc54c HK |
377 | mutex_unlock(&minor_lock); |
378 | return retval; | |
379 | } | |
380 | ||
381 | static void uio_free_minor(struct uio_device *idev) | |
382 | { | |
0d4a7bc1 | 383 | mutex_lock(&minor_lock); |
beafc54c | 384 | idr_remove(&uio_idr, idev->minor); |
0d4a7bc1 | 385 | mutex_unlock(&minor_lock); |
beafc54c HK |
386 | } |
387 | ||
388 | /** | |
389 | * uio_event_notify - trigger an interrupt event | |
390 | * @info: UIO device capabilities | |
391 | */ | |
392 | void uio_event_notify(struct uio_info *info) | |
393 | { | |
394 | struct uio_device *idev = info->uio_dev; | |
395 | ||
396 | atomic_inc(&idev->event); | |
397 | wake_up_interruptible(&idev->wait); | |
398 | kill_fasync(&idev->async_queue, SIGIO, POLL_IN); | |
399 | } | |
400 | EXPORT_SYMBOL_GPL(uio_event_notify); | |
401 | ||
402 | /** | |
403 | * uio_interrupt - hardware interrupt handler | |
404 | * @irq: IRQ number, can be UIO_IRQ_CYCLIC for cyclic timer | |
405 | * @dev_id: Pointer to the devices uio_device structure | |
406 | */ | |
407 | static irqreturn_t uio_interrupt(int irq, void *dev_id) | |
408 | { | |
409 | struct uio_device *idev = (struct uio_device *)dev_id; | |
410 | irqreturn_t ret = idev->info->handler(irq, idev->info); | |
411 | ||
412 | if (ret == IRQ_HANDLED) | |
413 | uio_event_notify(idev->info); | |
414 | ||
415 | return ret; | |
416 | } | |
417 | ||
418 | struct uio_listener { | |
419 | struct uio_device *dev; | |
420 | s32 event_count; | |
421 | }; | |
422 | ||
423 | static int uio_open(struct inode *inode, struct file *filep) | |
424 | { | |
425 | struct uio_device *idev; | |
426 | struct uio_listener *listener; | |
427 | int ret = 0; | |
428 | ||
0d4a7bc1 | 429 | mutex_lock(&minor_lock); |
beafc54c | 430 | idev = idr_find(&uio_idr, iminor(inode)); |
0d4a7bc1 | 431 | mutex_unlock(&minor_lock); |
fbc8a81d JC |
432 | if (!idev) { |
433 | ret = -ENODEV; | |
434 | goto out; | |
435 | } | |
beafc54c | 436 | |
fbc8a81d JC |
437 | if (!try_module_get(idev->owner)) { |
438 | ret = -ENODEV; | |
439 | goto out; | |
440 | } | |
610ad506 | 441 | |
beafc54c | 442 | listener = kmalloc(sizeof(*listener), GFP_KERNEL); |
610ad506 UKK |
443 | if (!listener) { |
444 | ret = -ENOMEM; | |
445 | goto err_alloc_listener; | |
446 | } | |
beafc54c HK |
447 | |
448 | listener->dev = idev; | |
449 | listener->event_count = atomic_read(&idev->event); | |
450 | filep->private_data = listener; | |
451 | ||
452 | if (idev->info->open) { | |
beafc54c | 453 | ret = idev->info->open(idev->info, inode); |
610ad506 UKK |
454 | if (ret) |
455 | goto err_infoopen; | |
beafc54c | 456 | } |
610ad506 UKK |
457 | return 0; |
458 | ||
459 | err_infoopen: | |
610ad506 | 460 | kfree(listener); |
610ad506 | 461 | |
0d4a7bc1 | 462 | err_alloc_listener: |
610ad506 | 463 | module_put(idev->owner); |
beafc54c | 464 | |
fbc8a81d | 465 | out: |
beafc54c HK |
466 | return ret; |
467 | } | |
468 | ||
469 | static int uio_fasync(int fd, struct file *filep, int on) | |
470 | { | |
471 | struct uio_listener *listener = filep->private_data; | |
472 | struct uio_device *idev = listener->dev; | |
473 | ||
474 | return fasync_helper(fd, filep, on, &idev->async_queue); | |
475 | } | |
476 | ||
477 | static int uio_release(struct inode *inode, struct file *filep) | |
478 | { | |
479 | int ret = 0; | |
480 | struct uio_listener *listener = filep->private_data; | |
481 | struct uio_device *idev = listener->dev; | |
482 | ||
610ad506 | 483 | if (idev->info->release) |
beafc54c | 484 | ret = idev->info->release(idev->info, inode); |
610ad506 UKK |
485 | |
486 | module_put(idev->owner); | |
beafc54c HK |
487 | kfree(listener); |
488 | return ret; | |
489 | } | |
490 | ||
491 | static unsigned int uio_poll(struct file *filep, poll_table *wait) | |
492 | { | |
493 | struct uio_listener *listener = filep->private_data; | |
494 | struct uio_device *idev = listener->dev; | |
495 | ||
6427a765 | 496 | if (!idev->info->irq) |
beafc54c HK |
497 | return -EIO; |
498 | ||
499 | poll_wait(filep, &idev->wait, wait); | |
500 | if (listener->event_count != atomic_read(&idev->event)) | |
501 | return POLLIN | POLLRDNORM; | |
502 | return 0; | |
503 | } | |
504 | ||
505 | static ssize_t uio_read(struct file *filep, char __user *buf, | |
506 | size_t count, loff_t *ppos) | |
507 | { | |
508 | struct uio_listener *listener = filep->private_data; | |
509 | struct uio_device *idev = listener->dev; | |
510 | DECLARE_WAITQUEUE(wait, current); | |
511 | ssize_t retval; | |
512 | s32 event_count; | |
513 | ||
6427a765 | 514 | if (!idev->info->irq) |
beafc54c HK |
515 | return -EIO; |
516 | ||
517 | if (count != sizeof(s32)) | |
518 | return -EINVAL; | |
519 | ||
520 | add_wait_queue(&idev->wait, &wait); | |
521 | ||
522 | do { | |
523 | set_current_state(TASK_INTERRUPTIBLE); | |
524 | ||
525 | event_count = atomic_read(&idev->event); | |
526 | if (event_count != listener->event_count) { | |
527 | if (copy_to_user(buf, &event_count, count)) | |
528 | retval = -EFAULT; | |
529 | else { | |
530 | listener->event_count = event_count; | |
531 | retval = count; | |
532 | } | |
533 | break; | |
534 | } | |
535 | ||
536 | if (filep->f_flags & O_NONBLOCK) { | |
537 | retval = -EAGAIN; | |
538 | break; | |
539 | } | |
540 | ||
541 | if (signal_pending(current)) { | |
542 | retval = -ERESTARTSYS; | |
543 | break; | |
544 | } | |
545 | schedule(); | |
546 | } while (1); | |
547 | ||
548 | __set_current_state(TASK_RUNNING); | |
549 | remove_wait_queue(&idev->wait, &wait); | |
550 | ||
551 | return retval; | |
552 | } | |
553 | ||
328a14e7 HK |
554 | static ssize_t uio_write(struct file *filep, const char __user *buf, |
555 | size_t count, loff_t *ppos) | |
556 | { | |
557 | struct uio_listener *listener = filep->private_data; | |
558 | struct uio_device *idev = listener->dev; | |
559 | ssize_t retval; | |
560 | s32 irq_on; | |
561 | ||
6427a765 | 562 | if (!idev->info->irq) |
328a14e7 HK |
563 | return -EIO; |
564 | ||
565 | if (count != sizeof(s32)) | |
566 | return -EINVAL; | |
567 | ||
568 | if (!idev->info->irqcontrol) | |
569 | return -ENOSYS; | |
570 | ||
571 | if (copy_from_user(&irq_on, buf, count)) | |
572 | return -EFAULT; | |
573 | ||
574 | retval = idev->info->irqcontrol(idev->info, irq_on); | |
575 | ||
576 | return retval ? retval : sizeof(s32); | |
577 | } | |
578 | ||
beafc54c HK |
579 | static int uio_find_mem_index(struct vm_area_struct *vma) |
580 | { | |
beafc54c HK |
581 | struct uio_device *idev = vma->vm_private_data; |
582 | ||
f0c554fd HD |
583 | if (vma->vm_pgoff < MAX_UIO_MAPS) { |
584 | if (idev->info->mem[vma->vm_pgoff].size == 0) | |
beafc54c | 585 | return -1; |
f0c554fd | 586 | return (int)vma->vm_pgoff; |
beafc54c HK |
587 | } |
588 | return -1; | |
589 | } | |
590 | ||
a18b630d | 591 | static int uio_vma_fault(struct vm_area_struct *vma, struct vm_fault *vmf) |
beafc54c HK |
592 | { |
593 | struct uio_device *idev = vma->vm_private_data; | |
a18b630d | 594 | struct page *page; |
02683ffd | 595 | unsigned long offset; |
e6418fcc | 596 | void *addr; |
beafc54c HK |
597 | |
598 | int mi = uio_find_mem_index(vma); | |
599 | if (mi < 0) | |
a18b630d | 600 | return VM_FAULT_SIGBUS; |
beafc54c | 601 | |
02683ffd AH |
602 | /* |
603 | * We need to subtract mi because userspace uses offset = N*PAGE_SIZE | |
604 | * to use mem[N]. | |
605 | */ | |
606 | offset = (vmf->pgoff - mi) << PAGE_SHIFT; | |
607 | ||
e6418fcc | 608 | addr = (void *)(unsigned long)idev->info->mem[mi].addr + offset; |
beafc54c | 609 | if (idev->info->mem[mi].memtype == UIO_MEM_LOGICAL) |
e6418fcc | 610 | page = virt_to_page(addr); |
beafc54c | 611 | else |
e6418fcc | 612 | page = vmalloc_to_page(addr); |
beafc54c | 613 | get_page(page); |
a18b630d NP |
614 | vmf->page = page; |
615 | return 0; | |
beafc54c HK |
616 | } |
617 | ||
7294151d | 618 | static const struct vm_operations_struct uio_logical_vm_ops = { |
a18b630d | 619 | .fault = uio_vma_fault, |
beafc54c HK |
620 | }; |
621 | ||
7294151d UKK |
622 | static int uio_mmap_logical(struct vm_area_struct *vma) |
623 | { | |
624 | vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; | |
625 | vma->vm_ops = &uio_logical_vm_ops; | |
7294151d UKK |
626 | return 0; |
627 | } | |
628 | ||
629 | static const struct vm_operations_struct uio_physical_vm_ops = { | |
630 | #ifdef CONFIG_HAVE_IOREMAP_PROT | |
631 | .access = generic_access_phys, | |
632 | #endif | |
633 | }; | |
634 | ||
beafc54c HK |
635 | static int uio_mmap_physical(struct vm_area_struct *vma) |
636 | { | |
637 | struct uio_device *idev = vma->vm_private_data; | |
638 | int mi = uio_find_mem_index(vma); | |
7314e613 | 639 | struct uio_mem *mem; |
beafc54c HK |
640 | if (mi < 0) |
641 | return -EINVAL; | |
7314e613 | 642 | mem = idev->info->mem + mi; |
beafc54c | 643 | |
b6550287 LT |
644 | if (mem->addr & ~PAGE_MASK) |
645 | return -ENODEV; | |
b29f680c | 646 | if (vma->vm_end - vma->vm_start > mem->size) |
7314e613 | 647 | return -EINVAL; |
7294151d | 648 | |
7314e613 | 649 | vma->vm_ops = &uio_physical_vm_ops; |
c9698d6b | 650 | vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); |
beafc54c | 651 | |
7314e613 LT |
652 | /* |
653 | * We cannot use the vm_iomap_memory() helper here, | |
654 | * because vma->vm_pgoff is the map index we looked | |
655 | * up above in uio_find_mem_index(), rather than an | |
656 | * actual page offset into the mmap. | |
657 | * | |
658 | * So we just do the physical mmap without a page | |
659 | * offset. | |
660 | */ | |
beafc54c HK |
661 | return remap_pfn_range(vma, |
662 | vma->vm_start, | |
7314e613 | 663 | mem->addr >> PAGE_SHIFT, |
beafc54c HK |
664 | vma->vm_end - vma->vm_start, |
665 | vma->vm_page_prot); | |
666 | } | |
667 | ||
beafc54c HK |
668 | static int uio_mmap(struct file *filep, struct vm_area_struct *vma) |
669 | { | |
670 | struct uio_listener *listener = filep->private_data; | |
671 | struct uio_device *idev = listener->dev; | |
672 | int mi; | |
673 | unsigned long requested_pages, actual_pages; | |
674 | int ret = 0; | |
675 | ||
676 | if (vma->vm_end < vma->vm_start) | |
677 | return -EINVAL; | |
678 | ||
679 | vma->vm_private_data = idev; | |
680 | ||
681 | mi = uio_find_mem_index(vma); | |
682 | if (mi < 0) | |
683 | return -EINVAL; | |
684 | ||
52c2dad9 | 685 | requested_pages = vma_pages(vma); |
6da2d377 IA |
686 | actual_pages = ((idev->info->mem[mi].addr & ~PAGE_MASK) |
687 | + idev->info->mem[mi].size + PAGE_SIZE -1) >> PAGE_SHIFT; | |
beafc54c HK |
688 | if (requested_pages > actual_pages) |
689 | return -EINVAL; | |
690 | ||
691 | if (idev->info->mmap) { | |
beafc54c | 692 | ret = idev->info->mmap(idev->info, vma); |
beafc54c HK |
693 | return ret; |
694 | } | |
695 | ||
696 | switch (idev->info->mem[mi].memtype) { | |
697 | case UIO_MEM_PHYS: | |
698 | return uio_mmap_physical(vma); | |
699 | case UIO_MEM_LOGICAL: | |
700 | case UIO_MEM_VIRTUAL: | |
701 | return uio_mmap_logical(vma); | |
702 | default: | |
703 | return -EINVAL; | |
704 | } | |
705 | } | |
706 | ||
4f014691 | 707 | static const struct file_operations uio_fops = { |
beafc54c HK |
708 | .owner = THIS_MODULE, |
709 | .open = uio_open, | |
710 | .release = uio_release, | |
711 | .read = uio_read, | |
328a14e7 | 712 | .write = uio_write, |
beafc54c HK |
713 | .mmap = uio_mmap, |
714 | .poll = uio_poll, | |
715 | .fasync = uio_fasync, | |
6038f373 | 716 | .llseek = noop_llseek, |
beafc54c HK |
717 | }; |
718 | ||
719 | static int uio_major_init(void) | |
720 | { | |
91960a46 EB |
721 | static const char name[] = "uio"; |
722 | struct cdev *cdev = NULL; | |
723 | dev_t uio_dev = 0; | |
724 | int result; | |
725 | ||
726 | result = alloc_chrdev_region(&uio_dev, 0, UIO_MAX_DEVICES, name); | |
727 | if (result) | |
728 | goto out; | |
729 | ||
730 | result = -ENOMEM; | |
731 | cdev = cdev_alloc(); | |
732 | if (!cdev) | |
733 | goto out_unregister; | |
734 | ||
735 | cdev->owner = THIS_MODULE; | |
736 | cdev->ops = &uio_fops; | |
737 | kobject_set_name(&cdev->kobj, "%s", name); | |
738 | ||
739 | result = cdev_add(cdev, uio_dev, UIO_MAX_DEVICES); | |
740 | if (result) | |
741 | goto out_put; | |
742 | ||
743 | uio_major = MAJOR(uio_dev); | |
744 | uio_cdev = cdev; | |
d80df1ce | 745 | return 0; |
91960a46 EB |
746 | out_put: |
747 | kobject_put(&cdev->kobj); | |
748 | out_unregister: | |
749 | unregister_chrdev_region(uio_dev, UIO_MAX_DEVICES); | |
d80df1ce WG |
750 | out: |
751 | return result; | |
beafc54c HK |
752 | } |
753 | ||
754 | static void uio_major_cleanup(void) | |
755 | { | |
91960a46 EB |
756 | unregister_chrdev_region(MKDEV(uio_major, 0), UIO_MAX_DEVICES); |
757 | cdev_del(uio_cdev); | |
beafc54c HK |
758 | } |
759 | ||
760 | static int init_uio_class(void) | |
761 | { | |
3d4f9d76 | 762 | int ret; |
beafc54c HK |
763 | |
764 | /* This is the first time in here, set everything up properly */ | |
765 | ret = uio_major_init(); | |
766 | if (ret) | |
767 | goto exit; | |
768 | ||
c66fdab6 EB |
769 | ret = class_register(&uio_class); |
770 | if (ret) { | |
771 | printk(KERN_ERR "class_register failed for uio\n"); | |
772 | goto err_class_register; | |
beafc54c HK |
773 | } |
774 | return 0; | |
775 | ||
c66fdab6 | 776 | err_class_register: |
beafc54c HK |
777 | uio_major_cleanup(); |
778 | exit: | |
779 | return ret; | |
780 | } | |
781 | ||
3d4f9d76 | 782 | static void release_uio_class(void) |
beafc54c | 783 | { |
c66fdab6 | 784 | class_unregister(&uio_class); |
beafc54c | 785 | uio_major_cleanup(); |
beafc54c HK |
786 | } |
787 | ||
788 | /** | |
789 | * uio_register_device - register a new userspace IO device | |
790 | * @owner: module that creates the new device | |
791 | * @parent: parent device | |
792 | * @info: UIO device capabilities | |
793 | * | |
794 | * returns zero on success or a negative error code. | |
795 | */ | |
796 | int __uio_register_device(struct module *owner, | |
797 | struct device *parent, | |
798 | struct uio_info *info) | |
799 | { | |
800 | struct uio_device *idev; | |
801 | int ret = 0; | |
802 | ||
803 | if (!parent || !info || !info->name || !info->version) | |
804 | return -EINVAL; | |
805 | ||
806 | info->uio_dev = NULL; | |
807 | ||
e6789cd3 | 808 | idev = devm_kzalloc(parent, sizeof(*idev), GFP_KERNEL); |
beafc54c | 809 | if (!idev) { |
e6789cd3 | 810 | return -ENOMEM; |
beafc54c HK |
811 | } |
812 | ||
813 | idev->owner = owner; | |
814 | idev->info = info; | |
815 | init_waitqueue_head(&idev->wait); | |
816 | atomic_set(&idev->event, 0); | |
817 | ||
818 | ret = uio_get_minor(idev); | |
819 | if (ret) | |
e6789cd3 | 820 | return ret; |
beafc54c | 821 | |
c66fdab6 | 822 | idev->dev = device_create(&uio_class, parent, |
a9b12619 GKH |
823 | MKDEV(uio_major, idev->minor), idev, |
824 | "uio%d", idev->minor); | |
beafc54c HK |
825 | if (IS_ERR(idev->dev)) { |
826 | printk(KERN_ERR "UIO: device register failed\n"); | |
827 | ret = PTR_ERR(idev->dev); | |
828 | goto err_device_create; | |
829 | } | |
beafc54c HK |
830 | |
831 | ret = uio_dev_add_attributes(idev); | |
832 | if (ret) | |
833 | goto err_uio_dev_add_attributes; | |
834 | ||
835 | info->uio_dev = idev; | |
836 | ||
6427a765 | 837 | if (info->irq && (info->irq != UIO_IRQ_CUSTOM)) { |
632fefaf | 838 | ret = devm_request_irq(idev->dev, info->irq, uio_interrupt, |
6427a765 | 839 | info->irq_flags, info->name, idev); |
beafc54c HK |
840 | if (ret) |
841 | goto err_request_irq; | |
842 | } | |
843 | ||
844 | return 0; | |
845 | ||
846 | err_request_irq: | |
847 | uio_dev_del_attributes(idev); | |
848 | err_uio_dev_add_attributes: | |
c66fdab6 | 849 | device_destroy(&uio_class, MKDEV(uio_major, idev->minor)); |
beafc54c HK |
850 | err_device_create: |
851 | uio_free_minor(idev); | |
beafc54c HK |
852 | return ret; |
853 | } | |
854 | EXPORT_SYMBOL_GPL(__uio_register_device); | |
855 | ||
856 | /** | |
857 | * uio_unregister_device - unregister a industrial IO device | |
858 | * @info: UIO device capabilities | |
859 | * | |
860 | */ | |
861 | void uio_unregister_device(struct uio_info *info) | |
862 | { | |
863 | struct uio_device *idev; | |
864 | ||
865 | if (!info || !info->uio_dev) | |
866 | return; | |
867 | ||
868 | idev = info->uio_dev; | |
869 | ||
870 | uio_free_minor(idev); | |
871 | ||
beafc54c HK |
872 | uio_dev_del_attributes(idev); |
873 | ||
c66fdab6 | 874 | device_destroy(&uio_class, MKDEV(uio_major, idev->minor)); |
beafc54c HK |
875 | |
876 | return; | |
877 | } | |
878 | EXPORT_SYMBOL_GPL(uio_unregister_device); | |
879 | ||
880 | static int __init uio_init(void) | |
881 | { | |
3d4f9d76 | 882 | return init_uio_class(); |
beafc54c HK |
883 | } |
884 | ||
885 | static void __exit uio_exit(void) | |
886 | { | |
3d4f9d76 | 887 | release_uio_class(); |
beafc54c HK |
888 | } |
889 | ||
890 | module_init(uio_init) | |
891 | module_exit(uio_exit) | |
892 | MODULE_LICENSE("GPL v2"); |