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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> | |
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; | |
beafc54c | 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; | |
91960a46 | 44 | static struct cdev *uio_cdev; |
beafc54c | 45 | static DEFINE_IDR(uio_idr); |
4f014691 | 46 | static const struct file_operations uio_fops; |
beafc54c | 47 | |
0d4a7bc1 JC |
48 | /* Protect idr accesses */ |
49 | static DEFINE_MUTEX(minor_lock); | |
50 | ||
beafc54c HK |
51 | /* |
52 | * attributes | |
53 | */ | |
54 | ||
81e7c6a6 GKH |
55 | struct uio_map { |
56 | struct kobject kobj; | |
57 | struct uio_mem *mem; | |
beafc54c | 58 | }; |
81e7c6a6 | 59 | #define to_map(map) container_of(map, struct uio_map, kobj) |
beafc54c | 60 | |
82057791 HK |
61 | static ssize_t map_name_show(struct uio_mem *mem, char *buf) |
62 | { | |
63 | if (unlikely(!mem->name)) | |
64 | mem->name = ""; | |
65 | ||
66 | return sprintf(buf, "%s\n", mem->name); | |
67 | } | |
68 | ||
4f808bcd | 69 | static ssize_t map_addr_show(struct uio_mem *mem, char *buf) |
beafc54c | 70 | { |
27a90700 | 71 | return sprintf(buf, "0x%llx\n", (unsigned long long)mem->addr); |
4f808bcd | 72 | } |
beafc54c | 73 | |
4f808bcd BP |
74 | static ssize_t map_size_show(struct uio_mem *mem, char *buf) |
75 | { | |
76 | return sprintf(buf, "0x%lx\n", mem->size); | |
beafc54c HK |
77 | } |
78 | ||
e2b39df1 HK |
79 | static ssize_t map_offset_show(struct uio_mem *mem, char *buf) |
80 | { | |
27a90700 | 81 | return sprintf(buf, "0x%llx\n", (unsigned long long)mem->addr & ~PAGE_MASK); |
e2b39df1 HK |
82 | } |
83 | ||
e70c412e | 84 | struct map_sysfs_entry { |
4f808bcd BP |
85 | struct attribute attr; |
86 | ssize_t (*show)(struct uio_mem *, char *); | |
87 | ssize_t (*store)(struct uio_mem *, const char *, size_t); | |
88 | }; | |
89 | ||
82057791 HK |
90 | static struct map_sysfs_entry name_attribute = |
91 | __ATTR(name, S_IRUGO, map_name_show, NULL); | |
e70c412e | 92 | static struct map_sysfs_entry addr_attribute = |
4f808bcd | 93 | __ATTR(addr, S_IRUGO, map_addr_show, NULL); |
e70c412e | 94 | static struct map_sysfs_entry size_attribute = |
4f808bcd | 95 | __ATTR(size, S_IRUGO, map_size_show, NULL); |
e70c412e | 96 | static struct map_sysfs_entry offset_attribute = |
e2b39df1 | 97 | __ATTR(offset, S_IRUGO, map_offset_show, NULL); |
beafc54c | 98 | |
81e7c6a6 | 99 | static struct attribute *attrs[] = { |
82057791 | 100 | &name_attribute.attr, |
4f808bcd | 101 | &addr_attribute.attr, |
81e7c6a6 | 102 | &size_attribute.attr, |
e2b39df1 | 103 | &offset_attribute.attr, |
81e7c6a6 | 104 | NULL, /* need to NULL terminate the list of attributes */ |
beafc54c HK |
105 | }; |
106 | ||
81e7c6a6 GKH |
107 | static void map_release(struct kobject *kobj) |
108 | { | |
109 | struct uio_map *map = to_map(kobj); | |
110 | kfree(map); | |
111 | } | |
112 | ||
4f808bcd BP |
113 | static ssize_t map_type_show(struct kobject *kobj, struct attribute *attr, |
114 | char *buf) | |
115 | { | |
116 | struct uio_map *map = to_map(kobj); | |
117 | struct uio_mem *mem = map->mem; | |
e70c412e | 118 | struct map_sysfs_entry *entry; |
4f808bcd | 119 | |
e70c412e | 120 | entry = container_of(attr, struct map_sysfs_entry, attr); |
4f808bcd BP |
121 | |
122 | if (!entry->show) | |
123 | return -EIO; | |
124 | ||
125 | return entry->show(mem, buf); | |
126 | } | |
127 | ||
52cf25d0 | 128 | static const struct sysfs_ops map_sysfs_ops = { |
4f808bcd BP |
129 | .show = map_type_show, |
130 | }; | |
131 | ||
beafc54c | 132 | static struct kobj_type map_attr_type = { |
81e7c6a6 | 133 | .release = map_release, |
e70c412e | 134 | .sysfs_ops = &map_sysfs_ops, |
81e7c6a6 | 135 | .default_attrs = attrs, |
beafc54c HK |
136 | }; |
137 | ||
e70c412e HK |
138 | struct uio_portio { |
139 | struct kobject kobj; | |
140 | struct uio_port *port; | |
141 | }; | |
142 | #define to_portio(portio) container_of(portio, struct uio_portio, kobj) | |
143 | ||
82057791 HK |
144 | static ssize_t portio_name_show(struct uio_port *port, char *buf) |
145 | { | |
146 | if (unlikely(!port->name)) | |
147 | port->name = ""; | |
148 | ||
149 | return sprintf(buf, "%s\n", port->name); | |
150 | } | |
151 | ||
e70c412e HK |
152 | static ssize_t portio_start_show(struct uio_port *port, char *buf) |
153 | { | |
154 | return sprintf(buf, "0x%lx\n", port->start); | |
155 | } | |
156 | ||
157 | static ssize_t portio_size_show(struct uio_port *port, char *buf) | |
158 | { | |
159 | return sprintf(buf, "0x%lx\n", port->size); | |
160 | } | |
161 | ||
162 | static ssize_t portio_porttype_show(struct uio_port *port, char *buf) | |
163 | { | |
164 | const char *porttypes[] = {"none", "x86", "gpio", "other"}; | |
165 | ||
166 | if ((port->porttype < 0) || (port->porttype > UIO_PORT_OTHER)) | |
167 | return -EINVAL; | |
168 | ||
169 | return sprintf(buf, "port_%s\n", porttypes[port->porttype]); | |
170 | } | |
171 | ||
172 | struct portio_sysfs_entry { | |
173 | struct attribute attr; | |
174 | ssize_t (*show)(struct uio_port *, char *); | |
175 | ssize_t (*store)(struct uio_port *, const char *, size_t); | |
176 | }; | |
177 | ||
82057791 HK |
178 | static struct portio_sysfs_entry portio_name_attribute = |
179 | __ATTR(name, S_IRUGO, portio_name_show, NULL); | |
e70c412e HK |
180 | static struct portio_sysfs_entry portio_start_attribute = |
181 | __ATTR(start, S_IRUGO, portio_start_show, NULL); | |
182 | static struct portio_sysfs_entry portio_size_attribute = | |
183 | __ATTR(size, S_IRUGO, portio_size_show, NULL); | |
184 | static struct portio_sysfs_entry portio_porttype_attribute = | |
185 | __ATTR(porttype, S_IRUGO, portio_porttype_show, NULL); | |
186 | ||
187 | static struct attribute *portio_attrs[] = { | |
82057791 | 188 | &portio_name_attribute.attr, |
e70c412e HK |
189 | &portio_start_attribute.attr, |
190 | &portio_size_attribute.attr, | |
191 | &portio_porttype_attribute.attr, | |
192 | NULL, | |
193 | }; | |
194 | ||
195 | static void portio_release(struct kobject *kobj) | |
196 | { | |
197 | struct uio_portio *portio = to_portio(kobj); | |
198 | kfree(portio); | |
199 | } | |
200 | ||
201 | static ssize_t portio_type_show(struct kobject *kobj, struct attribute *attr, | |
202 | char *buf) | |
203 | { | |
204 | struct uio_portio *portio = to_portio(kobj); | |
205 | struct uio_port *port = portio->port; | |
206 | struct portio_sysfs_entry *entry; | |
207 | ||
208 | entry = container_of(attr, struct portio_sysfs_entry, attr); | |
209 | ||
210 | if (!entry->show) | |
211 | return -EIO; | |
212 | ||
213 | return entry->show(port, buf); | |
214 | } | |
215 | ||
52cf25d0 | 216 | static const struct sysfs_ops portio_sysfs_ops = { |
e70c412e HK |
217 | .show = portio_type_show, |
218 | }; | |
219 | ||
220 | static struct kobj_type portio_attr_type = { | |
221 | .release = portio_release, | |
222 | .sysfs_ops = &portio_sysfs_ops, | |
223 | .default_attrs = portio_attrs, | |
224 | }; | |
225 | ||
c9dce927 | 226 | static ssize_t name_show(struct device *dev, |
beafc54c HK |
227 | struct device_attribute *attr, char *buf) |
228 | { | |
229 | struct uio_device *idev = dev_get_drvdata(dev); | |
70a9156b | 230 | return sprintf(buf, "%s\n", idev->info->name); |
beafc54c | 231 | } |
c9dce927 | 232 | static DEVICE_ATTR_RO(name); |
beafc54c | 233 | |
c9dce927 | 234 | static ssize_t version_show(struct device *dev, |
beafc54c HK |
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 | } |
c9dce927 | 240 | static DEVICE_ATTR_RO(version); |
beafc54c | 241 | |
c9dce927 | 242 | static ssize_t event_show(struct device *dev, |
beafc54c HK |
243 | struct device_attribute *attr, char *buf) |
244 | { | |
245 | struct uio_device *idev = dev_get_drvdata(dev); | |
70a9156b | 246 | return sprintf(buf, "%u\n", (unsigned int)atomic_read(&idev->event)); |
beafc54c | 247 | } |
c9dce927 | 248 | static DEVICE_ATTR_RO(event); |
beafc54c | 249 | |
c9dce927 GKH |
250 | static struct attribute *uio_attrs[] = { |
251 | &dev_attr_name.attr, | |
252 | &dev_attr_version.attr, | |
253 | &dev_attr_event.attr, | |
254 | NULL, | |
beafc54c | 255 | }; |
c9dce927 | 256 | ATTRIBUTE_GROUPS(uio); |
beafc54c | 257 | |
c66fdab6 EB |
258 | /* UIO class infrastructure */ |
259 | static struct class uio_class = { | |
260 | .name = "uio", | |
c9dce927 | 261 | .dev_groups = uio_groups, |
beafc54c HK |
262 | }; |
263 | ||
264 | /* | |
265 | * device functions | |
266 | */ | |
267 | static int uio_dev_add_attributes(struct uio_device *idev) | |
268 | { | |
269 | int ret; | |
e70c412e | 270 | int mi, pi; |
beafc54c | 271 | int map_found = 0; |
e70c412e | 272 | int portio_found = 0; |
beafc54c | 273 | struct uio_mem *mem; |
81e7c6a6 | 274 | struct uio_map *map; |
e70c412e HK |
275 | struct uio_port *port; |
276 | struct uio_portio *portio; | |
beafc54c | 277 | |
beafc54c HK |
278 | for (mi = 0; mi < MAX_UIO_MAPS; mi++) { |
279 | mem = &idev->info->mem[mi]; | |
280 | if (mem->size == 0) | |
281 | break; | |
282 | if (!map_found) { | |
283 | map_found = 1; | |
81e7c6a6 GKH |
284 | idev->map_dir = kobject_create_and_add("maps", |
285 | &idev->dev->kobj); | |
286 | if (!idev->map_dir) | |
e70c412e | 287 | goto err_map; |
beafc54c | 288 | } |
81e7c6a6 GKH |
289 | map = kzalloc(sizeof(*map), GFP_KERNEL); |
290 | if (!map) | |
e70c412e | 291 | goto err_map; |
f9cb074b | 292 | kobject_init(&map->kobj, &map_attr_type); |
81e7c6a6 GKH |
293 | map->mem = mem; |
294 | mem->map = map; | |
b2d6db58 | 295 | ret = kobject_add(&map->kobj, idev->map_dir, "map%d", mi); |
81e7c6a6 | 296 | if (ret) |
e70c412e | 297 | goto err_map; |
81e7c6a6 | 298 | ret = kobject_uevent(&map->kobj, KOBJ_ADD); |
beafc54c | 299 | if (ret) |
e70c412e HK |
300 | goto err_map; |
301 | } | |
302 | ||
303 | for (pi = 0; pi < MAX_UIO_PORT_REGIONS; pi++) { | |
304 | port = &idev->info->port[pi]; | |
305 | if (port->size == 0) | |
306 | break; | |
307 | if (!portio_found) { | |
308 | portio_found = 1; | |
309 | idev->portio_dir = kobject_create_and_add("portio", | |
310 | &idev->dev->kobj); | |
311 | if (!idev->portio_dir) | |
312 | goto err_portio; | |
313 | } | |
314 | portio = kzalloc(sizeof(*portio), GFP_KERNEL); | |
315 | if (!portio) | |
316 | goto err_portio; | |
317 | kobject_init(&portio->kobj, &portio_attr_type); | |
318 | portio->port = port; | |
319 | port->portio = portio; | |
320 | ret = kobject_add(&portio->kobj, idev->portio_dir, | |
321 | "port%d", pi); | |
322 | if (ret) | |
323 | goto err_portio; | |
324 | ret = kobject_uevent(&portio->kobj, KOBJ_ADD); | |
325 | if (ret) | |
326 | goto err_portio; | |
beafc54c HK |
327 | } |
328 | ||
329 | return 0; | |
330 | ||
e70c412e HK |
331 | err_portio: |
332 | for (pi--; pi >= 0; pi--) { | |
333 | port = &idev->info->port[pi]; | |
334 | portio = port->portio; | |
335 | kobject_put(&portio->kobj); | |
336 | } | |
337 | kobject_put(idev->portio_dir); | |
338 | err_map: | |
beafc54c HK |
339 | for (mi--; mi>=0; mi--) { |
340 | mem = &idev->info->mem[mi]; | |
81e7c6a6 | 341 | map = mem->map; |
c10997f6 | 342 | kobject_put(&map->kobj); |
beafc54c | 343 | } |
c10997f6 | 344 | kobject_put(idev->map_dir); |
beafc54c HK |
345 | dev_err(idev->dev, "error creating sysfs files (%d)\n", ret); |
346 | return ret; | |
347 | } | |
348 | ||
349 | static void uio_dev_del_attributes(struct uio_device *idev) | |
350 | { | |
e70c412e | 351 | int i; |
beafc54c | 352 | struct uio_mem *mem; |
e70c412e HK |
353 | struct uio_port *port; |
354 | ||
355 | for (i = 0; i < MAX_UIO_MAPS; i++) { | |
356 | mem = &idev->info->mem[i]; | |
beafc54c HK |
357 | if (mem->size == 0) |
358 | break; | |
c10997f6 | 359 | kobject_put(&mem->map->kobj); |
beafc54c | 360 | } |
c10997f6 | 361 | kobject_put(idev->map_dir); |
e70c412e HK |
362 | |
363 | for (i = 0; i < MAX_UIO_PORT_REGIONS; i++) { | |
364 | port = &idev->info->port[i]; | |
365 | if (port->size == 0) | |
366 | break; | |
367 | kobject_put(&port->portio->kobj); | |
368 | } | |
369 | kobject_put(idev->portio_dir); | |
beafc54c HK |
370 | } |
371 | ||
372 | static int uio_get_minor(struct uio_device *idev) | |
373 | { | |
beafc54c | 374 | int retval = -ENOMEM; |
beafc54c HK |
375 | |
376 | mutex_lock(&minor_lock); | |
6d770931 TH |
377 | retval = idr_alloc(&uio_idr, idev, 0, UIO_MAX_DEVICES, GFP_KERNEL); |
378 | if (retval >= 0) { | |
379 | idev->minor = retval; | |
5ed0505c | 380 | retval = 0; |
6d770931 | 381 | } else if (retval == -ENOSPC) { |
c6edc42f HD |
382 | dev_err(idev->dev, "too many uio devices\n"); |
383 | retval = -EINVAL; | |
c6edc42f | 384 | } |
beafc54c HK |
385 | mutex_unlock(&minor_lock); |
386 | return retval; | |
387 | } | |
388 | ||
389 | static void uio_free_minor(struct uio_device *idev) | |
390 | { | |
0d4a7bc1 | 391 | mutex_lock(&minor_lock); |
beafc54c | 392 | idr_remove(&uio_idr, idev->minor); |
0d4a7bc1 | 393 | mutex_unlock(&minor_lock); |
beafc54c HK |
394 | } |
395 | ||
396 | /** | |
397 | * uio_event_notify - trigger an interrupt event | |
398 | * @info: UIO device capabilities | |
399 | */ | |
400 | void uio_event_notify(struct uio_info *info) | |
401 | { | |
402 | struct uio_device *idev = info->uio_dev; | |
403 | ||
404 | atomic_inc(&idev->event); | |
405 | wake_up_interruptible(&idev->wait); | |
406 | kill_fasync(&idev->async_queue, SIGIO, POLL_IN); | |
407 | } | |
408 | EXPORT_SYMBOL_GPL(uio_event_notify); | |
409 | ||
410 | /** | |
411 | * uio_interrupt - hardware interrupt handler | |
412 | * @irq: IRQ number, can be UIO_IRQ_CYCLIC for cyclic timer | |
413 | * @dev_id: Pointer to the devices uio_device structure | |
414 | */ | |
415 | static irqreturn_t uio_interrupt(int irq, void *dev_id) | |
416 | { | |
417 | struct uio_device *idev = (struct uio_device *)dev_id; | |
418 | irqreturn_t ret = idev->info->handler(irq, idev->info); | |
419 | ||
420 | if (ret == IRQ_HANDLED) | |
421 | uio_event_notify(idev->info); | |
422 | ||
423 | return ret; | |
424 | } | |
425 | ||
426 | struct uio_listener { | |
427 | struct uio_device *dev; | |
428 | s32 event_count; | |
429 | }; | |
430 | ||
431 | static int uio_open(struct inode *inode, struct file *filep) | |
432 | { | |
433 | struct uio_device *idev; | |
434 | struct uio_listener *listener; | |
435 | int ret = 0; | |
436 | ||
0d4a7bc1 | 437 | mutex_lock(&minor_lock); |
beafc54c | 438 | idev = idr_find(&uio_idr, iminor(inode)); |
0d4a7bc1 | 439 | mutex_unlock(&minor_lock); |
fbc8a81d JC |
440 | if (!idev) { |
441 | ret = -ENODEV; | |
442 | goto out; | |
443 | } | |
beafc54c | 444 | |
fbc8a81d JC |
445 | if (!try_module_get(idev->owner)) { |
446 | ret = -ENODEV; | |
447 | goto out; | |
448 | } | |
610ad506 | 449 | |
beafc54c | 450 | listener = kmalloc(sizeof(*listener), GFP_KERNEL); |
610ad506 UKK |
451 | if (!listener) { |
452 | ret = -ENOMEM; | |
453 | goto err_alloc_listener; | |
454 | } | |
beafc54c HK |
455 | |
456 | listener->dev = idev; | |
457 | listener->event_count = atomic_read(&idev->event); | |
458 | filep->private_data = listener; | |
459 | ||
460 | if (idev->info->open) { | |
beafc54c | 461 | ret = idev->info->open(idev->info, inode); |
610ad506 UKK |
462 | if (ret) |
463 | goto err_infoopen; | |
beafc54c | 464 | } |
610ad506 UKK |
465 | return 0; |
466 | ||
467 | err_infoopen: | |
610ad506 | 468 | kfree(listener); |
610ad506 | 469 | |
0d4a7bc1 | 470 | err_alloc_listener: |
610ad506 | 471 | module_put(idev->owner); |
beafc54c | 472 | |
fbc8a81d | 473 | out: |
beafc54c HK |
474 | return ret; |
475 | } | |
476 | ||
477 | static int uio_fasync(int fd, struct file *filep, int on) | |
478 | { | |
479 | struct uio_listener *listener = filep->private_data; | |
480 | struct uio_device *idev = listener->dev; | |
481 | ||
482 | return fasync_helper(fd, filep, on, &idev->async_queue); | |
483 | } | |
484 | ||
485 | static int uio_release(struct inode *inode, struct file *filep) | |
486 | { | |
487 | int ret = 0; | |
488 | struct uio_listener *listener = filep->private_data; | |
489 | struct uio_device *idev = listener->dev; | |
490 | ||
610ad506 | 491 | if (idev->info->release) |
beafc54c | 492 | ret = idev->info->release(idev->info, inode); |
610ad506 UKK |
493 | |
494 | module_put(idev->owner); | |
beafc54c HK |
495 | kfree(listener); |
496 | return ret; | |
497 | } | |
498 | ||
499 | static unsigned int uio_poll(struct file *filep, poll_table *wait) | |
500 | { | |
501 | struct uio_listener *listener = filep->private_data; | |
502 | struct uio_device *idev = listener->dev; | |
503 | ||
6427a765 | 504 | if (!idev->info->irq) |
beafc54c HK |
505 | return -EIO; |
506 | ||
507 | poll_wait(filep, &idev->wait, wait); | |
508 | if (listener->event_count != atomic_read(&idev->event)) | |
509 | return POLLIN | POLLRDNORM; | |
510 | return 0; | |
511 | } | |
512 | ||
513 | static ssize_t uio_read(struct file *filep, char __user *buf, | |
514 | size_t count, loff_t *ppos) | |
515 | { | |
516 | struct uio_listener *listener = filep->private_data; | |
517 | struct uio_device *idev = listener->dev; | |
518 | DECLARE_WAITQUEUE(wait, current); | |
519 | ssize_t retval; | |
520 | s32 event_count; | |
521 | ||
6427a765 | 522 | if (!idev->info->irq) |
beafc54c HK |
523 | return -EIO; |
524 | ||
525 | if (count != sizeof(s32)) | |
526 | return -EINVAL; | |
527 | ||
528 | add_wait_queue(&idev->wait, &wait); | |
529 | ||
530 | do { | |
531 | set_current_state(TASK_INTERRUPTIBLE); | |
532 | ||
533 | event_count = atomic_read(&idev->event); | |
534 | if (event_count != listener->event_count) { | |
535 | if (copy_to_user(buf, &event_count, count)) | |
536 | retval = -EFAULT; | |
537 | else { | |
538 | listener->event_count = event_count; | |
539 | retval = count; | |
540 | } | |
541 | break; | |
542 | } | |
543 | ||
544 | if (filep->f_flags & O_NONBLOCK) { | |
545 | retval = -EAGAIN; | |
546 | break; | |
547 | } | |
548 | ||
549 | if (signal_pending(current)) { | |
550 | retval = -ERESTARTSYS; | |
551 | break; | |
552 | } | |
553 | schedule(); | |
554 | } while (1); | |
555 | ||
556 | __set_current_state(TASK_RUNNING); | |
557 | remove_wait_queue(&idev->wait, &wait); | |
558 | ||
559 | return retval; | |
560 | } | |
561 | ||
328a14e7 HK |
562 | static ssize_t uio_write(struct file *filep, const char __user *buf, |
563 | size_t count, loff_t *ppos) | |
564 | { | |
565 | struct uio_listener *listener = filep->private_data; | |
566 | struct uio_device *idev = listener->dev; | |
567 | ssize_t retval; | |
568 | s32 irq_on; | |
569 | ||
6427a765 | 570 | if (!idev->info->irq) |
328a14e7 HK |
571 | return -EIO; |
572 | ||
573 | if (count != sizeof(s32)) | |
574 | return -EINVAL; | |
575 | ||
576 | if (!idev->info->irqcontrol) | |
577 | return -ENOSYS; | |
578 | ||
579 | if (copy_from_user(&irq_on, buf, count)) | |
580 | return -EFAULT; | |
581 | ||
582 | retval = idev->info->irqcontrol(idev->info, irq_on); | |
583 | ||
584 | return retval ? retval : sizeof(s32); | |
585 | } | |
586 | ||
beafc54c HK |
587 | static int uio_find_mem_index(struct vm_area_struct *vma) |
588 | { | |
beafc54c HK |
589 | struct uio_device *idev = vma->vm_private_data; |
590 | ||
f0c554fd HD |
591 | if (vma->vm_pgoff < MAX_UIO_MAPS) { |
592 | if (idev->info->mem[vma->vm_pgoff].size == 0) | |
beafc54c | 593 | return -1; |
f0c554fd | 594 | return (int)vma->vm_pgoff; |
beafc54c HK |
595 | } |
596 | return -1; | |
597 | } | |
598 | ||
a18b630d | 599 | static int uio_vma_fault(struct vm_area_struct *vma, struct vm_fault *vmf) |
beafc54c HK |
600 | { |
601 | struct uio_device *idev = vma->vm_private_data; | |
a18b630d | 602 | struct page *page; |
02683ffd | 603 | unsigned long offset; |
beafc54c HK |
604 | |
605 | int mi = uio_find_mem_index(vma); | |
606 | if (mi < 0) | |
a18b630d | 607 | return VM_FAULT_SIGBUS; |
beafc54c | 608 | |
02683ffd AH |
609 | /* |
610 | * We need to subtract mi because userspace uses offset = N*PAGE_SIZE | |
611 | * to use mem[N]. | |
612 | */ | |
613 | offset = (vmf->pgoff - mi) << PAGE_SHIFT; | |
614 | ||
beafc54c | 615 | if (idev->info->mem[mi].memtype == UIO_MEM_LOGICAL) |
02683ffd | 616 | page = virt_to_page(idev->info->mem[mi].addr + offset); |
beafc54c | 617 | else |
27a90700 | 618 | page = vmalloc_to_page((void *)(unsigned long)idev->info->mem[mi].addr + offset); |
beafc54c | 619 | get_page(page); |
a18b630d NP |
620 | vmf->page = page; |
621 | return 0; | |
beafc54c HK |
622 | } |
623 | ||
7294151d | 624 | static const struct vm_operations_struct uio_logical_vm_ops = { |
a18b630d | 625 | .fault = uio_vma_fault, |
beafc54c HK |
626 | }; |
627 | ||
7294151d UKK |
628 | static int uio_mmap_logical(struct vm_area_struct *vma) |
629 | { | |
630 | vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; | |
631 | vma->vm_ops = &uio_logical_vm_ops; | |
7294151d UKK |
632 | return 0; |
633 | } | |
634 | ||
635 | static const struct vm_operations_struct uio_physical_vm_ops = { | |
636 | #ifdef CONFIG_HAVE_IOREMAP_PROT | |
637 | .access = generic_access_phys, | |
638 | #endif | |
639 | }; | |
640 | ||
beafc54c HK |
641 | static int uio_mmap_physical(struct vm_area_struct *vma) |
642 | { | |
643 | struct uio_device *idev = vma->vm_private_data; | |
644 | int mi = uio_find_mem_index(vma); | |
645 | if (mi < 0) | |
646 | return -EINVAL; | |
647 | ||
7294151d UKK |
648 | vma->vm_ops = &uio_physical_vm_ops; |
649 | ||
c9698d6b | 650 | vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); |
beafc54c HK |
651 | |
652 | return remap_pfn_range(vma, | |
653 | vma->vm_start, | |
654 | idev->info->mem[mi].addr >> PAGE_SHIFT, | |
655 | vma->vm_end - vma->vm_start, | |
656 | vma->vm_page_prot); | |
657 | } | |
658 | ||
beafc54c HK |
659 | static int uio_mmap(struct file *filep, struct vm_area_struct *vma) |
660 | { | |
661 | struct uio_listener *listener = filep->private_data; | |
662 | struct uio_device *idev = listener->dev; | |
663 | int mi; | |
664 | unsigned long requested_pages, actual_pages; | |
665 | int ret = 0; | |
666 | ||
667 | if (vma->vm_end < vma->vm_start) | |
668 | return -EINVAL; | |
669 | ||
670 | vma->vm_private_data = idev; | |
671 | ||
672 | mi = uio_find_mem_index(vma); | |
673 | if (mi < 0) | |
674 | return -EINVAL; | |
675 | ||
52c2dad9 | 676 | requested_pages = vma_pages(vma); |
6da2d377 IA |
677 | actual_pages = ((idev->info->mem[mi].addr & ~PAGE_MASK) |
678 | + idev->info->mem[mi].size + PAGE_SIZE -1) >> PAGE_SHIFT; | |
beafc54c HK |
679 | if (requested_pages > actual_pages) |
680 | return -EINVAL; | |
681 | ||
682 | if (idev->info->mmap) { | |
beafc54c | 683 | ret = idev->info->mmap(idev->info, vma); |
beafc54c HK |
684 | return ret; |
685 | } | |
686 | ||
687 | switch (idev->info->mem[mi].memtype) { | |
688 | case UIO_MEM_PHYS: | |
689 | return uio_mmap_physical(vma); | |
690 | case UIO_MEM_LOGICAL: | |
691 | case UIO_MEM_VIRTUAL: | |
692 | return uio_mmap_logical(vma); | |
693 | default: | |
694 | return -EINVAL; | |
695 | } | |
696 | } | |
697 | ||
4f014691 | 698 | static const struct file_operations uio_fops = { |
beafc54c HK |
699 | .owner = THIS_MODULE, |
700 | .open = uio_open, | |
701 | .release = uio_release, | |
702 | .read = uio_read, | |
328a14e7 | 703 | .write = uio_write, |
beafc54c HK |
704 | .mmap = uio_mmap, |
705 | .poll = uio_poll, | |
706 | .fasync = uio_fasync, | |
6038f373 | 707 | .llseek = noop_llseek, |
beafc54c HK |
708 | }; |
709 | ||
710 | static int uio_major_init(void) | |
711 | { | |
91960a46 EB |
712 | static const char name[] = "uio"; |
713 | struct cdev *cdev = NULL; | |
714 | dev_t uio_dev = 0; | |
715 | int result; | |
716 | ||
717 | result = alloc_chrdev_region(&uio_dev, 0, UIO_MAX_DEVICES, name); | |
718 | if (result) | |
719 | goto out; | |
720 | ||
721 | result = -ENOMEM; | |
722 | cdev = cdev_alloc(); | |
723 | if (!cdev) | |
724 | goto out_unregister; | |
725 | ||
726 | cdev->owner = THIS_MODULE; | |
727 | cdev->ops = &uio_fops; | |
728 | kobject_set_name(&cdev->kobj, "%s", name); | |
729 | ||
730 | result = cdev_add(cdev, uio_dev, UIO_MAX_DEVICES); | |
731 | if (result) | |
732 | goto out_put; | |
733 | ||
734 | uio_major = MAJOR(uio_dev); | |
735 | uio_cdev = cdev; | |
d80df1ce | 736 | return 0; |
91960a46 EB |
737 | out_put: |
738 | kobject_put(&cdev->kobj); | |
739 | out_unregister: | |
740 | unregister_chrdev_region(uio_dev, UIO_MAX_DEVICES); | |
d80df1ce WG |
741 | out: |
742 | return result; | |
beafc54c HK |
743 | } |
744 | ||
745 | static void uio_major_cleanup(void) | |
746 | { | |
91960a46 EB |
747 | unregister_chrdev_region(MKDEV(uio_major, 0), UIO_MAX_DEVICES); |
748 | cdev_del(uio_cdev); | |
beafc54c HK |
749 | } |
750 | ||
751 | static int init_uio_class(void) | |
752 | { | |
3d4f9d76 | 753 | int ret; |
beafc54c HK |
754 | |
755 | /* This is the first time in here, set everything up properly */ | |
756 | ret = uio_major_init(); | |
757 | if (ret) | |
758 | goto exit; | |
759 | ||
c66fdab6 EB |
760 | ret = class_register(&uio_class); |
761 | if (ret) { | |
762 | printk(KERN_ERR "class_register failed for uio\n"); | |
763 | goto err_class_register; | |
beafc54c HK |
764 | } |
765 | return 0; | |
766 | ||
c66fdab6 | 767 | err_class_register: |
beafc54c HK |
768 | uio_major_cleanup(); |
769 | exit: | |
770 | return ret; | |
771 | } | |
772 | ||
3d4f9d76 | 773 | static void release_uio_class(void) |
beafc54c | 774 | { |
c66fdab6 | 775 | class_unregister(&uio_class); |
beafc54c | 776 | uio_major_cleanup(); |
beafc54c HK |
777 | } |
778 | ||
779 | /** | |
780 | * uio_register_device - register a new userspace IO device | |
781 | * @owner: module that creates the new device | |
782 | * @parent: parent device | |
783 | * @info: UIO device capabilities | |
784 | * | |
785 | * returns zero on success or a negative error code. | |
786 | */ | |
787 | int __uio_register_device(struct module *owner, | |
788 | struct device *parent, | |
789 | struct uio_info *info) | |
790 | { | |
791 | struct uio_device *idev; | |
792 | int ret = 0; | |
793 | ||
794 | if (!parent || !info || !info->name || !info->version) | |
795 | return -EINVAL; | |
796 | ||
797 | info->uio_dev = NULL; | |
798 | ||
e6789cd3 | 799 | idev = devm_kzalloc(parent, sizeof(*idev), GFP_KERNEL); |
beafc54c | 800 | if (!idev) { |
e6789cd3 | 801 | return -ENOMEM; |
beafc54c HK |
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) | |
e6789cd3 | 811 | return ret; |
beafc54c | 812 | |
c66fdab6 | 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 | 828 | if (info->irq && (info->irq != UIO_IRQ_CUSTOM)) { |
e6789cd3 | 829 | ret = devm_request_irq(parent, info->irq, uio_interrupt, |
6427a765 | 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: | |
c66fdab6 | 840 | device_destroy(&uio_class, MKDEV(uio_major, idev->minor)); |
beafc54c HK |
841 | err_device_create: |
842 | uio_free_minor(idev); | |
beafc54c HK |
843 | return ret; |
844 | } | |
845 | EXPORT_SYMBOL_GPL(__uio_register_device); | |
846 | ||
847 | /** | |
848 | * uio_unregister_device - unregister a industrial IO device | |
849 | * @info: UIO device capabilities | |
850 | * | |
851 | */ | |
852 | void uio_unregister_device(struct uio_info *info) | |
853 | { | |
854 | struct uio_device *idev; | |
855 | ||
856 | if (!info || !info->uio_dev) | |
857 | return; | |
858 | ||
859 | idev = info->uio_dev; | |
860 | ||
861 | uio_free_minor(idev); | |
862 | ||
beafc54c HK |
863 | uio_dev_del_attributes(idev); |
864 | ||
c66fdab6 | 865 | device_destroy(&uio_class, MKDEV(uio_major, idev->minor)); |
beafc54c HK |
866 | |
867 | return; | |
868 | } | |
869 | EXPORT_SYMBOL_GPL(uio_unregister_device); | |
870 | ||
871 | static int __init uio_init(void) | |
872 | { | |
3d4f9d76 | 873 | return init_uio_class(); |
beafc54c HK |
874 | } |
875 | ||
876 | static void __exit uio_exit(void) | |
877 | { | |
3d4f9d76 | 878 | release_uio_class(); |
beafc54c HK |
879 | } |
880 | ||
881 | module_init(uio_init) | |
882 | module_exit(uio_exit) | |
883 | MODULE_LICENSE("GPL v2"); |