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 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 | 48 | |
0d4a7bc1 JC |
49 | /* Protect idr accesses */ |
50 | static DEFINE_MUTEX(minor_lock); | |
51 | ||
beafc54c HK |
52 | /* |
53 | * attributes | |
54 | */ | |
55 | ||
81e7c6a6 GKH |
56 | struct uio_map { |
57 | struct kobject kobj; | |
58 | struct uio_mem *mem; | |
beafc54c | 59 | }; |
81e7c6a6 | 60 | #define to_map(map) container_of(map, struct uio_map, kobj) |
beafc54c | 61 | |
82057791 HK |
62 | static ssize_t map_name_show(struct uio_mem *mem, char *buf) |
63 | { | |
64 | if (unlikely(!mem->name)) | |
65 | mem->name = ""; | |
66 | ||
67 | return sprintf(buf, "%s\n", mem->name); | |
68 | } | |
69 | ||
4f808bcd | 70 | static ssize_t map_addr_show(struct uio_mem *mem, char *buf) |
beafc54c | 71 | { |
27a90700 | 72 | return sprintf(buf, "0x%llx\n", (unsigned long long)mem->addr); |
4f808bcd | 73 | } |
beafc54c | 74 | |
4f808bcd BP |
75 | static ssize_t map_size_show(struct uio_mem *mem, char *buf) |
76 | { | |
77 | return sprintf(buf, "0x%lx\n", mem->size); | |
beafc54c HK |
78 | } |
79 | ||
e2b39df1 HK |
80 | static ssize_t map_offset_show(struct uio_mem *mem, char *buf) |
81 | { | |
27a90700 | 82 | return sprintf(buf, "0x%llx\n", (unsigned long long)mem->addr & ~PAGE_MASK); |
e2b39df1 HK |
83 | } |
84 | ||
e70c412e | 85 | struct map_sysfs_entry { |
4f808bcd BP |
86 | struct attribute attr; |
87 | ssize_t (*show)(struct uio_mem *, char *); | |
88 | ssize_t (*store)(struct uio_mem *, const char *, size_t); | |
89 | }; | |
90 | ||
82057791 HK |
91 | static struct map_sysfs_entry name_attribute = |
92 | __ATTR(name, S_IRUGO, map_name_show, NULL); | |
e70c412e | 93 | static struct map_sysfs_entry addr_attribute = |
4f808bcd | 94 | __ATTR(addr, S_IRUGO, map_addr_show, NULL); |
e70c412e | 95 | static struct map_sysfs_entry size_attribute = |
4f808bcd | 96 | __ATTR(size, S_IRUGO, map_size_show, NULL); |
e70c412e | 97 | static struct map_sysfs_entry offset_attribute = |
e2b39df1 | 98 | __ATTR(offset, S_IRUGO, map_offset_show, NULL); |
beafc54c | 99 | |
81e7c6a6 | 100 | static struct attribute *attrs[] = { |
82057791 | 101 | &name_attribute.attr, |
4f808bcd | 102 | &addr_attribute.attr, |
81e7c6a6 | 103 | &size_attribute.attr, |
e2b39df1 | 104 | &offset_attribute.attr, |
81e7c6a6 | 105 | NULL, /* need to NULL terminate the list of attributes */ |
beafc54c HK |
106 | }; |
107 | ||
81e7c6a6 GKH |
108 | static void map_release(struct kobject *kobj) |
109 | { | |
110 | struct uio_map *map = to_map(kobj); | |
111 | kfree(map); | |
112 | } | |
113 | ||
4f808bcd BP |
114 | static ssize_t map_type_show(struct kobject *kobj, struct attribute *attr, |
115 | char *buf) | |
116 | { | |
117 | struct uio_map *map = to_map(kobj); | |
118 | struct uio_mem *mem = map->mem; | |
e70c412e | 119 | struct map_sysfs_entry *entry; |
4f808bcd | 120 | |
e70c412e | 121 | entry = container_of(attr, struct map_sysfs_entry, attr); |
4f808bcd BP |
122 | |
123 | if (!entry->show) | |
124 | return -EIO; | |
125 | ||
126 | return entry->show(mem, buf); | |
127 | } | |
128 | ||
52cf25d0 | 129 | static const struct sysfs_ops map_sysfs_ops = { |
4f808bcd BP |
130 | .show = map_type_show, |
131 | }; | |
132 | ||
beafc54c | 133 | static struct kobj_type map_attr_type = { |
81e7c6a6 | 134 | .release = map_release, |
e70c412e | 135 | .sysfs_ops = &map_sysfs_ops, |
81e7c6a6 | 136 | .default_attrs = attrs, |
beafc54c HK |
137 | }; |
138 | ||
e70c412e HK |
139 | struct uio_portio { |
140 | struct kobject kobj; | |
141 | struct uio_port *port; | |
142 | }; | |
143 | #define to_portio(portio) container_of(portio, struct uio_portio, kobj) | |
144 | ||
82057791 HK |
145 | static ssize_t portio_name_show(struct uio_port *port, char *buf) |
146 | { | |
147 | if (unlikely(!port->name)) | |
148 | port->name = ""; | |
149 | ||
150 | return sprintf(buf, "%s\n", port->name); | |
151 | } | |
152 | ||
e70c412e HK |
153 | static ssize_t portio_start_show(struct uio_port *port, char *buf) |
154 | { | |
155 | return sprintf(buf, "0x%lx\n", port->start); | |
156 | } | |
157 | ||
158 | static ssize_t portio_size_show(struct uio_port *port, char *buf) | |
159 | { | |
160 | return sprintf(buf, "0x%lx\n", port->size); | |
161 | } | |
162 | ||
163 | static ssize_t portio_porttype_show(struct uio_port *port, char *buf) | |
164 | { | |
165 | const char *porttypes[] = {"none", "x86", "gpio", "other"}; | |
166 | ||
167 | if ((port->porttype < 0) || (port->porttype > UIO_PORT_OTHER)) | |
168 | return -EINVAL; | |
169 | ||
170 | return sprintf(buf, "port_%s\n", porttypes[port->porttype]); | |
171 | } | |
172 | ||
173 | struct portio_sysfs_entry { | |
174 | struct attribute attr; | |
175 | ssize_t (*show)(struct uio_port *, char *); | |
176 | ssize_t (*store)(struct uio_port *, const char *, size_t); | |
177 | }; | |
178 | ||
82057791 HK |
179 | static struct portio_sysfs_entry portio_name_attribute = |
180 | __ATTR(name, S_IRUGO, portio_name_show, NULL); | |
e70c412e HK |
181 | static struct portio_sysfs_entry portio_start_attribute = |
182 | __ATTR(start, S_IRUGO, portio_start_show, NULL); | |
183 | static struct portio_sysfs_entry portio_size_attribute = | |
184 | __ATTR(size, S_IRUGO, portio_size_show, NULL); | |
185 | static struct portio_sysfs_entry portio_porttype_attribute = | |
186 | __ATTR(porttype, S_IRUGO, portio_porttype_show, NULL); | |
187 | ||
188 | static struct attribute *portio_attrs[] = { | |
82057791 | 189 | &portio_name_attribute.attr, |
e70c412e HK |
190 | &portio_start_attribute.attr, |
191 | &portio_size_attribute.attr, | |
192 | &portio_porttype_attribute.attr, | |
193 | NULL, | |
194 | }; | |
195 | ||
196 | static void portio_release(struct kobject *kobj) | |
197 | { | |
198 | struct uio_portio *portio = to_portio(kobj); | |
199 | kfree(portio); | |
200 | } | |
201 | ||
202 | static ssize_t portio_type_show(struct kobject *kobj, struct attribute *attr, | |
203 | char *buf) | |
204 | { | |
205 | struct uio_portio *portio = to_portio(kobj); | |
206 | struct uio_port *port = portio->port; | |
207 | struct portio_sysfs_entry *entry; | |
208 | ||
209 | entry = container_of(attr, struct portio_sysfs_entry, attr); | |
210 | ||
211 | if (!entry->show) | |
212 | return -EIO; | |
213 | ||
214 | return entry->show(port, buf); | |
215 | } | |
216 | ||
52cf25d0 | 217 | static const struct sysfs_ops portio_sysfs_ops = { |
e70c412e HK |
218 | .show = portio_type_show, |
219 | }; | |
220 | ||
221 | static struct kobj_type portio_attr_type = { | |
222 | .release = portio_release, | |
223 | .sysfs_ops = &portio_sysfs_ops, | |
224 | .default_attrs = portio_attrs, | |
225 | }; | |
226 | ||
beafc54c HK |
227 | static ssize_t show_name(struct device *dev, |
228 | struct device_attribute *attr, char *buf) | |
229 | { | |
230 | struct uio_device *idev = dev_get_drvdata(dev); | |
70a9156b | 231 | return sprintf(buf, "%s\n", idev->info->name); |
beafc54c | 232 | } |
beafc54c HK |
233 | |
234 | static ssize_t show_version(struct device *dev, | |
235 | struct device_attribute *attr, char *buf) | |
236 | { | |
237 | struct uio_device *idev = dev_get_drvdata(dev); | |
70a9156b | 238 | return sprintf(buf, "%s\n", idev->info->version); |
beafc54c | 239 | } |
beafc54c HK |
240 | |
241 | static ssize_t show_event(struct device *dev, | |
242 | struct device_attribute *attr, char *buf) | |
243 | { | |
244 | struct uio_device *idev = dev_get_drvdata(dev); | |
70a9156b | 245 | return sprintf(buf, "%u\n", (unsigned int)atomic_read(&idev->event)); |
beafc54c | 246 | } |
beafc54c | 247 | |
c66fdab6 EB |
248 | static struct device_attribute uio_class_attributes[] = { |
249 | __ATTR(name, S_IRUGO, show_name, NULL), | |
250 | __ATTR(version, S_IRUGO, show_version, NULL), | |
251 | __ATTR(event, S_IRUGO, show_event, NULL), | |
252 | {} | |
beafc54c HK |
253 | }; |
254 | ||
c66fdab6 EB |
255 | /* UIO class infrastructure */ |
256 | static struct class uio_class = { | |
257 | .name = "uio", | |
258 | .dev_attrs = uio_class_attributes, | |
beafc54c HK |
259 | }; |
260 | ||
261 | /* | |
262 | * device functions | |
263 | */ | |
264 | static int uio_dev_add_attributes(struct uio_device *idev) | |
265 | { | |
266 | int ret; | |
e70c412e | 267 | int mi, pi; |
beafc54c | 268 | int map_found = 0; |
e70c412e | 269 | int portio_found = 0; |
beafc54c | 270 | struct uio_mem *mem; |
81e7c6a6 | 271 | struct uio_map *map; |
e70c412e HK |
272 | struct uio_port *port; |
273 | struct uio_portio *portio; | |
beafc54c | 274 | |
beafc54c HK |
275 | for (mi = 0; mi < MAX_UIO_MAPS; mi++) { |
276 | mem = &idev->info->mem[mi]; | |
277 | if (mem->size == 0) | |
278 | break; | |
279 | if (!map_found) { | |
280 | map_found = 1; | |
81e7c6a6 GKH |
281 | idev->map_dir = kobject_create_and_add("maps", |
282 | &idev->dev->kobj); | |
283 | if (!idev->map_dir) | |
e70c412e | 284 | goto err_map; |
beafc54c | 285 | } |
81e7c6a6 GKH |
286 | map = kzalloc(sizeof(*map), GFP_KERNEL); |
287 | if (!map) | |
e70c412e | 288 | goto err_map; |
f9cb074b | 289 | kobject_init(&map->kobj, &map_attr_type); |
81e7c6a6 GKH |
290 | map->mem = mem; |
291 | mem->map = map; | |
b2d6db58 | 292 | ret = kobject_add(&map->kobj, idev->map_dir, "map%d", mi); |
81e7c6a6 | 293 | if (ret) |
e70c412e | 294 | goto err_map; |
81e7c6a6 | 295 | ret = kobject_uevent(&map->kobj, KOBJ_ADD); |
beafc54c | 296 | if (ret) |
e70c412e HK |
297 | goto err_map; |
298 | } | |
299 | ||
300 | for (pi = 0; pi < MAX_UIO_PORT_REGIONS; pi++) { | |
301 | port = &idev->info->port[pi]; | |
302 | if (port->size == 0) | |
303 | break; | |
304 | if (!portio_found) { | |
305 | portio_found = 1; | |
306 | idev->portio_dir = kobject_create_and_add("portio", | |
307 | &idev->dev->kobj); | |
308 | if (!idev->portio_dir) | |
309 | goto err_portio; | |
310 | } | |
311 | portio = kzalloc(sizeof(*portio), GFP_KERNEL); | |
312 | if (!portio) | |
313 | goto err_portio; | |
314 | kobject_init(&portio->kobj, &portio_attr_type); | |
315 | portio->port = port; | |
316 | port->portio = portio; | |
317 | ret = kobject_add(&portio->kobj, idev->portio_dir, | |
318 | "port%d", pi); | |
319 | if (ret) | |
320 | goto err_portio; | |
321 | ret = kobject_uevent(&portio->kobj, KOBJ_ADD); | |
322 | if (ret) | |
323 | goto err_portio; | |
beafc54c HK |
324 | } |
325 | ||
326 | return 0; | |
327 | ||
e70c412e HK |
328 | err_portio: |
329 | for (pi--; pi >= 0; pi--) { | |
330 | port = &idev->info->port[pi]; | |
331 | portio = port->portio; | |
332 | kobject_put(&portio->kobj); | |
333 | } | |
334 | kobject_put(idev->portio_dir); | |
335 | err_map: | |
beafc54c HK |
336 | for (mi--; mi>=0; mi--) { |
337 | mem = &idev->info->mem[mi]; | |
81e7c6a6 | 338 | map = mem->map; |
c10997f6 | 339 | kobject_put(&map->kobj); |
beafc54c | 340 | } |
c10997f6 | 341 | kobject_put(idev->map_dir); |
beafc54c HK |
342 | dev_err(idev->dev, "error creating sysfs files (%d)\n", ret); |
343 | return ret; | |
344 | } | |
345 | ||
346 | static void uio_dev_del_attributes(struct uio_device *idev) | |
347 | { | |
e70c412e | 348 | int i; |
beafc54c | 349 | struct uio_mem *mem; |
e70c412e HK |
350 | struct uio_port *port; |
351 | ||
352 | for (i = 0; i < MAX_UIO_MAPS; i++) { | |
353 | mem = &idev->info->mem[i]; | |
beafc54c HK |
354 | if (mem->size == 0) |
355 | break; | |
c10997f6 | 356 | kobject_put(&mem->map->kobj); |
beafc54c | 357 | } |
c10997f6 | 358 | kobject_put(idev->map_dir); |
e70c412e HK |
359 | |
360 | for (i = 0; i < MAX_UIO_PORT_REGIONS; i++) { | |
361 | port = &idev->info->port[i]; | |
362 | if (port->size == 0) | |
363 | break; | |
364 | kobject_put(&port->portio->kobj); | |
365 | } | |
366 | kobject_put(idev->portio_dir); | |
beafc54c HK |
367 | } |
368 | ||
369 | static int uio_get_minor(struct uio_device *idev) | |
370 | { | |
beafc54c | 371 | int retval = -ENOMEM; |
beafc54c HK |
372 | |
373 | mutex_lock(&minor_lock); | |
6d770931 TH |
374 | retval = idr_alloc(&uio_idr, idev, 0, UIO_MAX_DEVICES, GFP_KERNEL); |
375 | if (retval >= 0) { | |
376 | idev->minor = retval; | |
5ed0505c | 377 | retval = 0; |
6d770931 | 378 | } else if (retval == -ENOSPC) { |
c6edc42f HD |
379 | dev_err(idev->dev, "too many uio devices\n"); |
380 | retval = -EINVAL; | |
c6edc42f | 381 | } |
beafc54c HK |
382 | mutex_unlock(&minor_lock); |
383 | return retval; | |
384 | } | |
385 | ||
386 | static void uio_free_minor(struct uio_device *idev) | |
387 | { | |
0d4a7bc1 | 388 | mutex_lock(&minor_lock); |
beafc54c | 389 | idr_remove(&uio_idr, idev->minor); |
0d4a7bc1 | 390 | mutex_unlock(&minor_lock); |
beafc54c HK |
391 | } |
392 | ||
393 | /** | |
394 | * uio_event_notify - trigger an interrupt event | |
395 | * @info: UIO device capabilities | |
396 | */ | |
397 | void uio_event_notify(struct uio_info *info) | |
398 | { | |
399 | struct uio_device *idev = info->uio_dev; | |
400 | ||
401 | atomic_inc(&idev->event); | |
402 | wake_up_interruptible(&idev->wait); | |
403 | kill_fasync(&idev->async_queue, SIGIO, POLL_IN); | |
404 | } | |
405 | EXPORT_SYMBOL_GPL(uio_event_notify); | |
406 | ||
407 | /** | |
408 | * uio_interrupt - hardware interrupt handler | |
409 | * @irq: IRQ number, can be UIO_IRQ_CYCLIC for cyclic timer | |
410 | * @dev_id: Pointer to the devices uio_device structure | |
411 | */ | |
412 | static irqreturn_t uio_interrupt(int irq, void *dev_id) | |
413 | { | |
414 | struct uio_device *idev = (struct uio_device *)dev_id; | |
415 | irqreturn_t ret = idev->info->handler(irq, idev->info); | |
416 | ||
417 | if (ret == IRQ_HANDLED) | |
418 | uio_event_notify(idev->info); | |
419 | ||
420 | return ret; | |
421 | } | |
422 | ||
423 | struct uio_listener { | |
424 | struct uio_device *dev; | |
425 | s32 event_count; | |
426 | }; | |
427 | ||
428 | static int uio_open(struct inode *inode, struct file *filep) | |
429 | { | |
430 | struct uio_device *idev; | |
431 | struct uio_listener *listener; | |
432 | int ret = 0; | |
433 | ||
0d4a7bc1 | 434 | mutex_lock(&minor_lock); |
beafc54c | 435 | idev = idr_find(&uio_idr, iminor(inode)); |
0d4a7bc1 | 436 | mutex_unlock(&minor_lock); |
fbc8a81d JC |
437 | if (!idev) { |
438 | ret = -ENODEV; | |
439 | goto out; | |
440 | } | |
beafc54c | 441 | |
fbc8a81d JC |
442 | if (!try_module_get(idev->owner)) { |
443 | ret = -ENODEV; | |
444 | goto out; | |
445 | } | |
610ad506 | 446 | |
beafc54c | 447 | listener = kmalloc(sizeof(*listener), GFP_KERNEL); |
610ad506 UKK |
448 | if (!listener) { |
449 | ret = -ENOMEM; | |
450 | goto err_alloc_listener; | |
451 | } | |
beafc54c HK |
452 | |
453 | listener->dev = idev; | |
454 | listener->event_count = atomic_read(&idev->event); | |
455 | filep->private_data = listener; | |
456 | ||
457 | if (idev->info->open) { | |
beafc54c | 458 | ret = idev->info->open(idev->info, inode); |
610ad506 UKK |
459 | if (ret) |
460 | goto err_infoopen; | |
beafc54c | 461 | } |
610ad506 UKK |
462 | return 0; |
463 | ||
464 | err_infoopen: | |
610ad506 | 465 | kfree(listener); |
610ad506 | 466 | |
0d4a7bc1 | 467 | err_alloc_listener: |
610ad506 | 468 | module_put(idev->owner); |
beafc54c | 469 | |
fbc8a81d | 470 | out: |
beafc54c HK |
471 | return ret; |
472 | } | |
473 | ||
474 | static int uio_fasync(int fd, struct file *filep, int on) | |
475 | { | |
476 | struct uio_listener *listener = filep->private_data; | |
477 | struct uio_device *idev = listener->dev; | |
478 | ||
479 | return fasync_helper(fd, filep, on, &idev->async_queue); | |
480 | } | |
481 | ||
482 | static int uio_release(struct inode *inode, struct file *filep) | |
483 | { | |
484 | int ret = 0; | |
485 | struct uio_listener *listener = filep->private_data; | |
486 | struct uio_device *idev = listener->dev; | |
487 | ||
610ad506 | 488 | if (idev->info->release) |
beafc54c | 489 | ret = idev->info->release(idev->info, inode); |
610ad506 UKK |
490 | |
491 | module_put(idev->owner); | |
beafc54c HK |
492 | kfree(listener); |
493 | return ret; | |
494 | } | |
495 | ||
496 | static unsigned int uio_poll(struct file *filep, poll_table *wait) | |
497 | { | |
498 | struct uio_listener *listener = filep->private_data; | |
499 | struct uio_device *idev = listener->dev; | |
500 | ||
6427a765 | 501 | if (!idev->info->irq) |
beafc54c HK |
502 | return -EIO; |
503 | ||
504 | poll_wait(filep, &idev->wait, wait); | |
505 | if (listener->event_count != atomic_read(&idev->event)) | |
506 | return POLLIN | POLLRDNORM; | |
507 | return 0; | |
508 | } | |
509 | ||
510 | static ssize_t uio_read(struct file *filep, char __user *buf, | |
511 | size_t count, loff_t *ppos) | |
512 | { | |
513 | struct uio_listener *listener = filep->private_data; | |
514 | struct uio_device *idev = listener->dev; | |
515 | DECLARE_WAITQUEUE(wait, current); | |
516 | ssize_t retval; | |
517 | s32 event_count; | |
518 | ||
6427a765 | 519 | if (!idev->info->irq) |
beafc54c HK |
520 | return -EIO; |
521 | ||
522 | if (count != sizeof(s32)) | |
523 | return -EINVAL; | |
524 | ||
525 | add_wait_queue(&idev->wait, &wait); | |
526 | ||
527 | do { | |
528 | set_current_state(TASK_INTERRUPTIBLE); | |
529 | ||
530 | event_count = atomic_read(&idev->event); | |
531 | if (event_count != listener->event_count) { | |
532 | if (copy_to_user(buf, &event_count, count)) | |
533 | retval = -EFAULT; | |
534 | else { | |
535 | listener->event_count = event_count; | |
536 | retval = count; | |
537 | } | |
538 | break; | |
539 | } | |
540 | ||
541 | if (filep->f_flags & O_NONBLOCK) { | |
542 | retval = -EAGAIN; | |
543 | break; | |
544 | } | |
545 | ||
546 | if (signal_pending(current)) { | |
547 | retval = -ERESTARTSYS; | |
548 | break; | |
549 | } | |
550 | schedule(); | |
551 | } while (1); | |
552 | ||
553 | __set_current_state(TASK_RUNNING); | |
554 | remove_wait_queue(&idev->wait, &wait); | |
555 | ||
556 | return retval; | |
557 | } | |
558 | ||
328a14e7 HK |
559 | static ssize_t uio_write(struct file *filep, const char __user *buf, |
560 | size_t count, loff_t *ppos) | |
561 | { | |
562 | struct uio_listener *listener = filep->private_data; | |
563 | struct uio_device *idev = listener->dev; | |
564 | ssize_t retval; | |
565 | s32 irq_on; | |
566 | ||
6427a765 | 567 | if (!idev->info->irq) |
328a14e7 HK |
568 | return -EIO; |
569 | ||
570 | if (count != sizeof(s32)) | |
571 | return -EINVAL; | |
572 | ||
573 | if (!idev->info->irqcontrol) | |
574 | return -ENOSYS; | |
575 | ||
576 | if (copy_from_user(&irq_on, buf, count)) | |
577 | return -EFAULT; | |
578 | ||
579 | retval = idev->info->irqcontrol(idev->info, irq_on); | |
580 | ||
581 | return retval ? retval : sizeof(s32); | |
582 | } | |
583 | ||
beafc54c HK |
584 | static int uio_find_mem_index(struct vm_area_struct *vma) |
585 | { | |
beafc54c HK |
586 | struct uio_device *idev = vma->vm_private_data; |
587 | ||
f0c554fd HD |
588 | if (vma->vm_pgoff < MAX_UIO_MAPS) { |
589 | if (idev->info->mem[vma->vm_pgoff].size == 0) | |
beafc54c | 590 | return -1; |
f0c554fd | 591 | return (int)vma->vm_pgoff; |
beafc54c HK |
592 | } |
593 | return -1; | |
594 | } | |
595 | ||
596 | static void uio_vma_open(struct vm_area_struct *vma) | |
597 | { | |
598 | struct uio_device *idev = vma->vm_private_data; | |
599 | idev->vma_count++; | |
600 | } | |
601 | ||
602 | static void uio_vma_close(struct vm_area_struct *vma) | |
603 | { | |
604 | struct uio_device *idev = vma->vm_private_data; | |
605 | idev->vma_count--; | |
606 | } | |
607 | ||
a18b630d | 608 | static int uio_vma_fault(struct vm_area_struct *vma, struct vm_fault *vmf) |
beafc54c HK |
609 | { |
610 | struct uio_device *idev = vma->vm_private_data; | |
a18b630d | 611 | struct page *page; |
02683ffd | 612 | unsigned long offset; |
beafc54c HK |
613 | |
614 | int mi = uio_find_mem_index(vma); | |
615 | if (mi < 0) | |
a18b630d | 616 | return VM_FAULT_SIGBUS; |
beafc54c | 617 | |
02683ffd AH |
618 | /* |
619 | * We need to subtract mi because userspace uses offset = N*PAGE_SIZE | |
620 | * to use mem[N]. | |
621 | */ | |
622 | offset = (vmf->pgoff - mi) << PAGE_SHIFT; | |
623 | ||
beafc54c | 624 | if (idev->info->mem[mi].memtype == UIO_MEM_LOGICAL) |
02683ffd | 625 | page = virt_to_page(idev->info->mem[mi].addr + offset); |
beafc54c | 626 | else |
27a90700 | 627 | page = vmalloc_to_page((void *)(unsigned long)idev->info->mem[mi].addr + offset); |
beafc54c | 628 | get_page(page); |
a18b630d NP |
629 | vmf->page = page; |
630 | return 0; | |
beafc54c HK |
631 | } |
632 | ||
f0f37e2f | 633 | static const struct vm_operations_struct uio_vm_ops = { |
beafc54c HK |
634 | .open = uio_vma_open, |
635 | .close = uio_vma_close, | |
a18b630d | 636 | .fault = uio_vma_fault, |
beafc54c HK |
637 | }; |
638 | ||
639 | static int uio_mmap_physical(struct vm_area_struct *vma) | |
640 | { | |
641 | struct uio_device *idev = vma->vm_private_data; | |
642 | int mi = uio_find_mem_index(vma); | |
643 | if (mi < 0) | |
644 | return -EINVAL; | |
645 | ||
c9698d6b | 646 | vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); |
beafc54c HK |
647 | |
648 | return remap_pfn_range(vma, | |
649 | vma->vm_start, | |
650 | idev->info->mem[mi].addr >> PAGE_SHIFT, | |
651 | vma->vm_end - vma->vm_start, | |
652 | vma->vm_page_prot); | |
653 | } | |
654 | ||
655 | static int uio_mmap_logical(struct vm_area_struct *vma) | |
656 | { | |
314e51b9 | 657 | vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; |
beafc54c HK |
658 | vma->vm_ops = &uio_vm_ops; |
659 | uio_vma_open(vma); | |
660 | return 0; | |
661 | } | |
662 | ||
663 | static int uio_mmap(struct file *filep, struct vm_area_struct *vma) | |
664 | { | |
665 | struct uio_listener *listener = filep->private_data; | |
666 | struct uio_device *idev = listener->dev; | |
667 | int mi; | |
668 | unsigned long requested_pages, actual_pages; | |
669 | int ret = 0; | |
670 | ||
671 | if (vma->vm_end < vma->vm_start) | |
672 | return -EINVAL; | |
673 | ||
674 | vma->vm_private_data = idev; | |
675 | ||
676 | mi = uio_find_mem_index(vma); | |
677 | if (mi < 0) | |
678 | return -EINVAL; | |
679 | ||
52c2dad9 | 680 | requested_pages = vma_pages(vma); |
6da2d377 IA |
681 | actual_pages = ((idev->info->mem[mi].addr & ~PAGE_MASK) |
682 | + idev->info->mem[mi].size + PAGE_SIZE -1) >> PAGE_SHIFT; | |
beafc54c HK |
683 | if (requested_pages > actual_pages) |
684 | return -EINVAL; | |
685 | ||
686 | if (idev->info->mmap) { | |
beafc54c | 687 | ret = idev->info->mmap(idev->info, vma); |
beafc54c HK |
688 | return ret; |
689 | } | |
690 | ||
691 | switch (idev->info->mem[mi].memtype) { | |
692 | case UIO_MEM_PHYS: | |
693 | return uio_mmap_physical(vma); | |
694 | case UIO_MEM_LOGICAL: | |
695 | case UIO_MEM_VIRTUAL: | |
696 | return uio_mmap_logical(vma); | |
697 | default: | |
698 | return -EINVAL; | |
699 | } | |
700 | } | |
701 | ||
4f014691 | 702 | static const struct file_operations uio_fops = { |
beafc54c HK |
703 | .owner = THIS_MODULE, |
704 | .open = uio_open, | |
705 | .release = uio_release, | |
706 | .read = uio_read, | |
328a14e7 | 707 | .write = uio_write, |
beafc54c HK |
708 | .mmap = uio_mmap, |
709 | .poll = uio_poll, | |
710 | .fasync = uio_fasync, | |
6038f373 | 711 | .llseek = noop_llseek, |
beafc54c HK |
712 | }; |
713 | ||
714 | static int uio_major_init(void) | |
715 | { | |
91960a46 EB |
716 | static const char name[] = "uio"; |
717 | struct cdev *cdev = NULL; | |
718 | dev_t uio_dev = 0; | |
719 | int result; | |
720 | ||
721 | result = alloc_chrdev_region(&uio_dev, 0, UIO_MAX_DEVICES, name); | |
722 | if (result) | |
723 | goto out; | |
724 | ||
725 | result = -ENOMEM; | |
726 | cdev = cdev_alloc(); | |
727 | if (!cdev) | |
728 | goto out_unregister; | |
729 | ||
730 | cdev->owner = THIS_MODULE; | |
731 | cdev->ops = &uio_fops; | |
732 | kobject_set_name(&cdev->kobj, "%s", name); | |
733 | ||
734 | result = cdev_add(cdev, uio_dev, UIO_MAX_DEVICES); | |
735 | if (result) | |
736 | goto out_put; | |
737 | ||
738 | uio_major = MAJOR(uio_dev); | |
739 | uio_cdev = cdev; | |
d80df1ce | 740 | return 0; |
91960a46 EB |
741 | out_put: |
742 | kobject_put(&cdev->kobj); | |
743 | out_unregister: | |
744 | unregister_chrdev_region(uio_dev, UIO_MAX_DEVICES); | |
d80df1ce WG |
745 | out: |
746 | return result; | |
beafc54c HK |
747 | } |
748 | ||
749 | static void uio_major_cleanup(void) | |
750 | { | |
91960a46 EB |
751 | unregister_chrdev_region(MKDEV(uio_major, 0), UIO_MAX_DEVICES); |
752 | cdev_del(uio_cdev); | |
beafc54c HK |
753 | } |
754 | ||
755 | static int init_uio_class(void) | |
756 | { | |
3d4f9d76 | 757 | int ret; |
beafc54c HK |
758 | |
759 | /* This is the first time in here, set everything up properly */ | |
760 | ret = uio_major_init(); | |
761 | if (ret) | |
762 | goto exit; | |
763 | ||
c66fdab6 EB |
764 | ret = class_register(&uio_class); |
765 | if (ret) { | |
766 | printk(KERN_ERR "class_register failed for uio\n"); | |
767 | goto err_class_register; | |
beafc54c HK |
768 | } |
769 | return 0; | |
770 | ||
c66fdab6 | 771 | err_class_register: |
beafc54c HK |
772 | uio_major_cleanup(); |
773 | exit: | |
774 | return ret; | |
775 | } | |
776 | ||
3d4f9d76 | 777 | static void release_uio_class(void) |
beafc54c | 778 | { |
c66fdab6 | 779 | class_unregister(&uio_class); |
beafc54c | 780 | uio_major_cleanup(); |
beafc54c HK |
781 | } |
782 | ||
783 | /** | |
784 | * uio_register_device - register a new userspace IO device | |
785 | * @owner: module that creates the new device | |
786 | * @parent: parent device | |
787 | * @info: UIO device capabilities | |
788 | * | |
789 | * returns zero on success or a negative error code. | |
790 | */ | |
791 | int __uio_register_device(struct module *owner, | |
792 | struct device *parent, | |
793 | struct uio_info *info) | |
794 | { | |
795 | struct uio_device *idev; | |
796 | int ret = 0; | |
797 | ||
798 | if (!parent || !info || !info->name || !info->version) | |
799 | return -EINVAL; | |
800 | ||
801 | info->uio_dev = NULL; | |
802 | ||
beafc54c HK |
803 | idev = kzalloc(sizeof(*idev), GFP_KERNEL); |
804 | if (!idev) { | |
805 | ret = -ENOMEM; | |
806 | goto err_kzalloc; | |
807 | } | |
808 | ||
809 | idev->owner = owner; | |
810 | idev->info = info; | |
811 | init_waitqueue_head(&idev->wait); | |
812 | atomic_set(&idev->event, 0); | |
813 | ||
814 | ret = uio_get_minor(idev); | |
815 | if (ret) | |
816 | goto err_get_minor; | |
817 | ||
c66fdab6 | 818 | idev->dev = device_create(&uio_class, parent, |
a9b12619 GKH |
819 | MKDEV(uio_major, idev->minor), idev, |
820 | "uio%d", idev->minor); | |
beafc54c HK |
821 | if (IS_ERR(idev->dev)) { |
822 | printk(KERN_ERR "UIO: device register failed\n"); | |
823 | ret = PTR_ERR(idev->dev); | |
824 | goto err_device_create; | |
825 | } | |
beafc54c HK |
826 | |
827 | ret = uio_dev_add_attributes(idev); | |
828 | if (ret) | |
829 | goto err_uio_dev_add_attributes; | |
830 | ||
831 | info->uio_dev = idev; | |
832 | ||
6427a765 EB |
833 | if (info->irq && (info->irq != UIO_IRQ_CUSTOM)) { |
834 | ret = request_irq(info->irq, uio_interrupt, | |
835 | info->irq_flags, info->name, idev); | |
beafc54c HK |
836 | if (ret) |
837 | goto err_request_irq; | |
838 | } | |
839 | ||
840 | return 0; | |
841 | ||
842 | err_request_irq: | |
843 | uio_dev_del_attributes(idev); | |
844 | err_uio_dev_add_attributes: | |
c66fdab6 | 845 | device_destroy(&uio_class, MKDEV(uio_major, idev->minor)); |
beafc54c HK |
846 | err_device_create: |
847 | uio_free_minor(idev); | |
848 | err_get_minor: | |
849 | kfree(idev); | |
850 | err_kzalloc: | |
beafc54c HK |
851 | return ret; |
852 | } | |
853 | EXPORT_SYMBOL_GPL(__uio_register_device); | |
854 | ||
855 | /** | |
856 | * uio_unregister_device - unregister a industrial IO device | |
857 | * @info: UIO device capabilities | |
858 | * | |
859 | */ | |
860 | void uio_unregister_device(struct uio_info *info) | |
861 | { | |
862 | struct uio_device *idev; | |
863 | ||
864 | if (!info || !info->uio_dev) | |
865 | return; | |
866 | ||
867 | idev = info->uio_dev; | |
868 | ||
869 | uio_free_minor(idev); | |
870 | ||
6427a765 | 871 | if (info->irq && (info->irq != UIO_IRQ_CUSTOM)) |
beafc54c HK |
872 | free_irq(info->irq, idev); |
873 | ||
874 | uio_dev_del_attributes(idev); | |
875 | ||
c66fdab6 | 876 | device_destroy(&uio_class, MKDEV(uio_major, idev->minor)); |
beafc54c | 877 | kfree(idev); |
beafc54c HK |
878 | |
879 | return; | |
880 | } | |
881 | EXPORT_SYMBOL_GPL(uio_unregister_device); | |
882 | ||
883 | static int __init uio_init(void) | |
884 | { | |
3d4f9d76 | 885 | return init_uio_class(); |
beafc54c HK |
886 | } |
887 | ||
888 | static void __exit uio_exit(void) | |
889 | { | |
3d4f9d76 | 890 | release_uio_class(); |
beafc54c HK |
891 | } |
892 | ||
893 | module_init(uio_init) | |
894 | module_exit(uio_exit) | |
895 | MODULE_LICENSE("GPL v2"); |