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Commit | Line | Data |
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847ec80b JC |
1 | /* The industrial I/O core |
2 | * | |
3 | * Copyright (c) 2008 Jonathan Cameron | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify it | |
6 | * under the terms of the GNU General Public License version 2 as published by | |
7 | * the Free Software Foundation. | |
8 | * | |
9 | * Based on elements of hwmon and input subsystems. | |
10 | */ | |
11 | ||
12 | #include <linux/kernel.h> | |
13 | #include <linux/module.h> | |
14 | #include <linux/idr.h> | |
15 | #include <linux/kdev_t.h> | |
16 | #include <linux/err.h> | |
17 | #include <linux/device.h> | |
18 | #include <linux/fs.h> | |
19 | #include <linux/interrupt.h> | |
20 | #include <linux/poll.h> | |
ffc18afa | 21 | #include <linux/sched.h> |
4439c935 | 22 | #include <linux/wait.h> |
847ec80b | 23 | #include <linux/cdev.h> |
5a0e3ad6 | 24 | #include <linux/slab.h> |
847ec80b JC |
25 | #include "iio.h" |
26 | #include "trigger_consumer.h" | |
27 | ||
28 | #define IIO_ID_PREFIX "device" | |
29 | #define IIO_ID_FORMAT IIO_ID_PREFIX "%d" | |
30 | ||
31 | /* IDR to assign each registered device a unique id*/ | |
32 | static DEFINE_IDR(iio_idr); | |
847ec80b JC |
33 | /* IDR to allocate character device minor numbers */ |
34 | static DEFINE_IDR(iio_chrdev_idr); | |
35 | /* Lock used to protect both of the above */ | |
36 | static DEFINE_SPINLOCK(iio_idr_lock); | |
37 | ||
38 | dev_t iio_devt; | |
39 | EXPORT_SYMBOL(iio_devt); | |
40 | ||
41 | #define IIO_DEV_MAX 256 | |
5aaaeba8 | 42 | struct bus_type iio_bus_type = { |
847ec80b | 43 | .name = "iio", |
847ec80b | 44 | }; |
5aaaeba8 | 45 | EXPORT_SYMBOL(iio_bus_type); |
847ec80b JC |
46 | |
47 | void __iio_change_event(struct iio_detected_event_list *ev, | |
48 | int ev_code, | |
49 | s64 timestamp) | |
50 | { | |
51 | ev->ev.id = ev_code; | |
52 | ev->ev.timestamp = timestamp; | |
53 | } | |
54 | EXPORT_SYMBOL(__iio_change_event); | |
55 | ||
56 | /* Used both in the interrupt line put events and the ring buffer ones */ | |
57 | ||
58 | /* Note that in it's current form someone has to be listening before events | |
59 | * are queued. Hence a client MUST open the chrdev before the ring buffer is | |
60 | * switched on. | |
61 | */ | |
62 | int __iio_push_event(struct iio_event_interface *ev_int, | |
63 | int ev_code, | |
64 | s64 timestamp, | |
65 | struct iio_shared_ev_pointer * | |
66 | shared_pointer_p) | |
67 | { | |
68 | struct iio_detected_event_list *ev; | |
69 | int ret = 0; | |
70 | ||
71 | /* Does anyone care? */ | |
72 | mutex_lock(&ev_int->event_list_lock); | |
73 | if (test_bit(IIO_BUSY_BIT_POS, &ev_int->handler.flags)) { | |
75c80753 JC |
74 | if (ev_int->current_events == ev_int->max_events) { |
75 | mutex_unlock(&ev_int->event_list_lock); | |
847ec80b | 76 | return 0; |
75c80753 | 77 | } |
847ec80b JC |
78 | ev = kmalloc(sizeof(*ev), GFP_KERNEL); |
79 | if (ev == NULL) { | |
80 | ret = -ENOMEM; | |
75c80753 | 81 | mutex_unlock(&ev_int->event_list_lock); |
847ec80b JC |
82 | goto error_ret; |
83 | } | |
84 | ev->ev.id = ev_code; | |
85 | ev->ev.timestamp = timestamp; | |
86 | ev->shared_pointer = shared_pointer_p; | |
87 | if (ev->shared_pointer) | |
88 | shared_pointer_p->ev_p = ev; | |
89 | ||
90 | list_add_tail(&ev->list, &ev_int->det_events.list); | |
91 | ev_int->current_events++; | |
92 | mutex_unlock(&ev_int->event_list_lock); | |
93 | wake_up_interruptible(&ev_int->wait); | |
94 | } else | |
95 | mutex_unlock(&ev_int->event_list_lock); | |
96 | ||
97 | error_ret: | |
98 | return ret; | |
99 | } | |
100 | EXPORT_SYMBOL(__iio_push_event); | |
101 | ||
102 | int iio_push_event(struct iio_dev *dev_info, | |
103 | int ev_line, | |
104 | int ev_code, | |
105 | s64 timestamp) | |
106 | { | |
107 | return __iio_push_event(&dev_info->event_interfaces[ev_line], | |
108 | ev_code, timestamp, NULL); | |
109 | } | |
110 | EXPORT_SYMBOL(iio_push_event); | |
111 | ||
112 | /* Generic interrupt line interrupt handler */ | |
77712e5f | 113 | static irqreturn_t iio_interrupt_handler(int irq, void *_int_info) |
847ec80b JC |
114 | { |
115 | struct iio_interrupt *int_info = _int_info; | |
116 | struct iio_dev *dev_info = int_info->dev_info; | |
117 | struct iio_event_handler_list *p; | |
118 | s64 time_ns; | |
119 | unsigned long flags; | |
120 | ||
121 | spin_lock_irqsave(&int_info->ev_list_lock, flags); | |
122 | if (list_empty(&int_info->ev_list)) { | |
123 | spin_unlock_irqrestore(&int_info->ev_list_lock, flags); | |
124 | return IRQ_NONE; | |
125 | } | |
126 | ||
127 | time_ns = iio_get_time_ns(); | |
128 | /* detect single element list*/ | |
129 | if (list_is_singular(&int_info->ev_list)) { | |
130 | disable_irq_nosync(irq); | |
131 | p = list_first_entry(&int_info->ev_list, | |
132 | struct iio_event_handler_list, | |
133 | list); | |
134 | /* single event handler - maybe shared */ | |
135 | p->handler(dev_info, 1, time_ns, !(p->refcount > 1)); | |
136 | } else | |
137 | list_for_each_entry(p, &int_info->ev_list, list) { | |
138 | disable_irq_nosync(irq); | |
139 | p->handler(dev_info, 1, time_ns, 0); | |
140 | } | |
141 | spin_unlock_irqrestore(&int_info->ev_list_lock, flags); | |
142 | ||
143 | return IRQ_HANDLED; | |
144 | } | |
145 | ||
146 | static struct iio_interrupt *iio_allocate_interrupt(void) | |
147 | { | |
148 | struct iio_interrupt *i = kmalloc(sizeof *i, GFP_KERNEL); | |
149 | if (i) { | |
150 | spin_lock_init(&i->ev_list_lock); | |
151 | INIT_LIST_HEAD(&i->ev_list); | |
152 | } | |
153 | return i; | |
154 | } | |
155 | ||
156 | /* Confirming the validity of supplied irq is left to drivers.*/ | |
157 | int iio_register_interrupt_line(unsigned int irq, | |
158 | struct iio_dev *dev_info, | |
159 | int line_number, | |
160 | unsigned long type, | |
161 | const char *name) | |
162 | { | |
163 | int ret; | |
164 | ||
165 | dev_info->interrupts[line_number] = iio_allocate_interrupt(); | |
166 | if (dev_info->interrupts[line_number] == NULL) { | |
167 | ret = -ENOMEM; | |
168 | goto error_ret; | |
169 | } | |
170 | dev_info->interrupts[line_number]->line_number = line_number; | |
171 | dev_info->interrupts[line_number]->irq = irq; | |
172 | dev_info->interrupts[line_number]->dev_info = dev_info; | |
173 | ||
174 | /* Possibly only request on demand? | |
175 | * Can see this may complicate the handling of interrupts. | |
176 | * However, with this approach we might end up handling lots of | |
177 | * events no-one cares about.*/ | |
178 | ret = request_irq(irq, | |
179 | &iio_interrupt_handler, | |
180 | type, | |
181 | name, | |
182 | dev_info->interrupts[line_number]); | |
183 | ||
184 | error_ret: | |
185 | return ret; | |
186 | } | |
187 | EXPORT_SYMBOL(iio_register_interrupt_line); | |
188 | ||
189 | /* This turns up an awful lot */ | |
190 | ssize_t iio_read_const_attr(struct device *dev, | |
191 | struct device_attribute *attr, | |
192 | char *buf) | |
193 | { | |
194 | return sprintf(buf, "%s\n", to_iio_const_attr(attr)->string); | |
195 | } | |
196 | EXPORT_SYMBOL(iio_read_const_attr); | |
197 | ||
198 | /* Before this runs the interrupt generator must have been disabled */ | |
199 | void iio_unregister_interrupt_line(struct iio_dev *dev_info, int line_number) | |
200 | { | |
201 | /* make sure the interrupt handlers are all done */ | |
202 | flush_scheduled_work(); | |
203 | free_irq(dev_info->interrupts[line_number]->irq, | |
204 | dev_info->interrupts[line_number]); | |
205 | kfree(dev_info->interrupts[line_number]); | |
206 | } | |
207 | EXPORT_SYMBOL(iio_unregister_interrupt_line); | |
208 | ||
209 | /* Reference counted add and remove */ | |
210 | void iio_add_event_to_list(struct iio_event_handler_list *el, | |
211 | struct list_head *head) | |
212 | { | |
213 | unsigned long flags; | |
214 | struct iio_interrupt *inter = to_iio_interrupt(head); | |
215 | ||
216 | /* take mutex to protect this element */ | |
217 | mutex_lock(&el->exist_lock); | |
218 | if (el->refcount == 0) { | |
219 | /* Take the event list spin lock */ | |
220 | spin_lock_irqsave(&inter->ev_list_lock, flags); | |
221 | list_add(&el->list, head); | |
222 | spin_unlock_irqrestore(&inter->ev_list_lock, flags); | |
223 | } | |
224 | el->refcount++; | |
225 | mutex_unlock(&el->exist_lock); | |
226 | } | |
227 | EXPORT_SYMBOL(iio_add_event_to_list); | |
228 | ||
229 | void iio_remove_event_from_list(struct iio_event_handler_list *el, | |
230 | struct list_head *head) | |
231 | { | |
232 | unsigned long flags; | |
233 | struct iio_interrupt *inter = to_iio_interrupt(head); | |
234 | ||
235 | mutex_lock(&el->exist_lock); | |
236 | el->refcount--; | |
237 | if (el->refcount == 0) { | |
238 | /* Take the event list spin lock */ | |
239 | spin_lock_irqsave(&inter->ev_list_lock, flags); | |
240 | list_del_init(&el->list); | |
241 | spin_unlock_irqrestore(&inter->ev_list_lock, flags); | |
242 | } | |
243 | mutex_unlock(&el->exist_lock); | |
244 | } | |
245 | EXPORT_SYMBOL(iio_remove_event_from_list); | |
246 | ||
77712e5f MB |
247 | static ssize_t iio_event_chrdev_read(struct file *filep, |
248 | char __user *buf, | |
249 | size_t count, | |
250 | loff_t *f_ps) | |
847ec80b JC |
251 | { |
252 | struct iio_event_interface *ev_int = filep->private_data; | |
253 | struct iio_detected_event_list *el; | |
254 | int ret; | |
255 | size_t len; | |
256 | ||
257 | mutex_lock(&ev_int->event_list_lock); | |
258 | if (list_empty(&ev_int->det_events.list)) { | |
259 | if (filep->f_flags & O_NONBLOCK) { | |
260 | ret = -EAGAIN; | |
261 | goto error_mutex_unlock; | |
262 | } | |
263 | mutex_unlock(&ev_int->event_list_lock); | |
264 | /* Blocking on device; waiting for something to be there */ | |
265 | ret = wait_event_interruptible(ev_int->wait, | |
266 | !list_empty(&ev_int | |
267 | ->det_events.list)); | |
268 | if (ret) | |
269 | goto error_ret; | |
270 | /* Single access device so noone else can get the data */ | |
271 | mutex_lock(&ev_int->event_list_lock); | |
272 | } | |
273 | ||
274 | el = list_first_entry(&ev_int->det_events.list, | |
275 | struct iio_detected_event_list, | |
276 | list); | |
277 | len = sizeof el->ev; | |
278 | if (copy_to_user(buf, &(el->ev), len)) { | |
279 | ret = -EFAULT; | |
280 | goto error_mutex_unlock; | |
281 | } | |
282 | list_del(&el->list); | |
283 | ev_int->current_events--; | |
284 | mutex_unlock(&ev_int->event_list_lock); | |
285 | /* | |
286 | * Possible concurency issue if an update of this event is on its way | |
75b16013 JC |
287 | * through. May lead to new event being removed whilst the reported |
288 | * event was the unescalated event. In typical use case this is not a | |
289 | * problem as userspace will say read half the buffer due to a 50% | |
290 | * full event which would make the correct 100% full incorrect anyway. | |
847ec80b | 291 | */ |
75b16013 JC |
292 | if (el->shared_pointer) { |
293 | spin_lock(&el->shared_pointer->lock); | |
847ec80b | 294 | (el->shared_pointer->ev_p) = NULL; |
75b16013 JC |
295 | spin_unlock(&el->shared_pointer->lock); |
296 | } | |
847ec80b JC |
297 | kfree(el); |
298 | ||
299 | return len; | |
300 | ||
301 | error_mutex_unlock: | |
302 | mutex_unlock(&ev_int->event_list_lock); | |
303 | error_ret: | |
304 | ||
305 | return ret; | |
306 | } | |
307 | ||
77712e5f | 308 | static int iio_event_chrdev_release(struct inode *inode, struct file *filep) |
847ec80b JC |
309 | { |
310 | struct iio_handler *hand = iio_cdev_to_handler(inode->i_cdev); | |
311 | struct iio_event_interface *ev_int = hand->private; | |
312 | struct iio_detected_event_list *el, *t; | |
313 | ||
314 | mutex_lock(&ev_int->event_list_lock); | |
315 | clear_bit(IIO_BUSY_BIT_POS, &ev_int->handler.flags); | |
316 | /* | |
317 | * In order to maintain a clean state for reopening, | |
318 | * clear out any awaiting events. The mask will prevent | |
319 | * any new __iio_push_event calls running. | |
320 | */ | |
321 | list_for_each_entry_safe(el, t, &ev_int->det_events.list, list) { | |
322 | list_del(&el->list); | |
323 | kfree(el); | |
324 | } | |
325 | mutex_unlock(&ev_int->event_list_lock); | |
326 | ||
327 | return 0; | |
328 | } | |
329 | ||
77712e5f | 330 | static int iio_event_chrdev_open(struct inode *inode, struct file *filep) |
847ec80b JC |
331 | { |
332 | struct iio_handler *hand = iio_cdev_to_handler(inode->i_cdev); | |
333 | struct iio_event_interface *ev_int = hand->private; | |
334 | ||
335 | mutex_lock(&ev_int->event_list_lock); | |
336 | if (test_and_set_bit(IIO_BUSY_BIT_POS, &hand->flags)) { | |
337 | fops_put(filep->f_op); | |
338 | mutex_unlock(&ev_int->event_list_lock); | |
339 | return -EBUSY; | |
340 | } | |
341 | filep->private_data = hand->private; | |
342 | mutex_unlock(&ev_int->event_list_lock); | |
343 | ||
344 | return 0; | |
345 | } | |
346 | ||
347 | static const struct file_operations iio_event_chrdev_fileops = { | |
348 | .read = iio_event_chrdev_read, | |
349 | .release = iio_event_chrdev_release, | |
350 | .open = iio_event_chrdev_open, | |
351 | .owner = THIS_MODULE, | |
6038f373 | 352 | .llseek = noop_llseek, |
847ec80b JC |
353 | }; |
354 | ||
355 | static void iio_event_dev_release(struct device *dev) | |
356 | { | |
357 | struct iio_event_interface *ev_int | |
358 | = container_of(dev, struct iio_event_interface, dev); | |
359 | cdev_del(&ev_int->handler.chrdev); | |
360 | iio_device_free_chrdev_minor(MINOR(dev->devt)); | |
361 | }; | |
362 | ||
363 | static struct device_type iio_event_type = { | |
364 | .release = iio_event_dev_release, | |
365 | }; | |
366 | ||
367 | int iio_device_get_chrdev_minor(void) | |
368 | { | |
369 | int ret, val; | |
370 | ||
371 | idr_again: | |
372 | if (unlikely(idr_pre_get(&iio_chrdev_idr, GFP_KERNEL) == 0)) | |
373 | return -ENOMEM; | |
374 | spin_lock(&iio_idr_lock); | |
375 | ret = idr_get_new(&iio_chrdev_idr, NULL, &val); | |
376 | spin_unlock(&iio_idr_lock); | |
377 | if (unlikely(ret == -EAGAIN)) | |
378 | goto idr_again; | |
379 | else if (unlikely(ret)) | |
380 | return ret; | |
381 | if (val > IIO_DEV_MAX) | |
382 | return -ENOMEM; | |
383 | return val; | |
384 | } | |
385 | ||
386 | void iio_device_free_chrdev_minor(int val) | |
387 | { | |
388 | spin_lock(&iio_idr_lock); | |
389 | idr_remove(&iio_chrdev_idr, val); | |
390 | spin_unlock(&iio_idr_lock); | |
391 | } | |
392 | ||
393 | int iio_setup_ev_int(struct iio_event_interface *ev_int, | |
394 | const char *name, | |
395 | struct module *owner, | |
396 | struct device *dev) | |
397 | { | |
398 | int ret, minor; | |
399 | ||
5aaaeba8 | 400 | ev_int->dev.bus = &iio_bus_type; |
847ec80b JC |
401 | ev_int->dev.parent = dev; |
402 | ev_int->dev.type = &iio_event_type; | |
403 | device_initialize(&ev_int->dev); | |
404 | ||
405 | minor = iio_device_get_chrdev_minor(); | |
406 | if (minor < 0) { | |
407 | ret = minor; | |
408 | goto error_device_put; | |
409 | } | |
410 | ev_int->dev.devt = MKDEV(MAJOR(iio_devt), minor); | |
411 | dev_set_name(&ev_int->dev, "%s", name); | |
412 | ||
413 | ret = device_add(&ev_int->dev); | |
414 | if (ret) | |
415 | goto error_free_minor; | |
416 | ||
417 | cdev_init(&ev_int->handler.chrdev, &iio_event_chrdev_fileops); | |
418 | ev_int->handler.chrdev.owner = owner; | |
419 | ||
420 | mutex_init(&ev_int->event_list_lock); | |
421 | /* discussion point - make this variable? */ | |
422 | ev_int->max_events = 10; | |
423 | ev_int->current_events = 0; | |
424 | INIT_LIST_HEAD(&ev_int->det_events.list); | |
425 | init_waitqueue_head(&ev_int->wait); | |
426 | ev_int->handler.private = ev_int; | |
427 | ev_int->handler.flags = 0; | |
428 | ||
429 | ret = cdev_add(&ev_int->handler.chrdev, ev_int->dev.devt, 1); | |
430 | if (ret) | |
431 | goto error_unreg_device; | |
432 | ||
433 | return 0; | |
434 | ||
435 | error_unreg_device: | |
436 | device_unregister(&ev_int->dev); | |
437 | error_free_minor: | |
438 | iio_device_free_chrdev_minor(minor); | |
439 | error_device_put: | |
440 | put_device(&ev_int->dev); | |
441 | ||
442 | return ret; | |
443 | } | |
444 | ||
445 | void iio_free_ev_int(struct iio_event_interface *ev_int) | |
446 | { | |
447 | device_unregister(&ev_int->dev); | |
448 | put_device(&ev_int->dev); | |
449 | } | |
450 | ||
451 | static int __init iio_dev_init(void) | |
452 | { | |
453 | int err; | |
454 | ||
455 | err = alloc_chrdev_region(&iio_devt, 0, IIO_DEV_MAX, "iio"); | |
456 | if (err < 0) | |
457 | printk(KERN_ERR "%s: failed to allocate char dev region\n", | |
458 | __FILE__); | |
459 | ||
460 | return err; | |
461 | } | |
462 | ||
463 | static void __exit iio_dev_exit(void) | |
464 | { | |
465 | if (iio_devt) | |
466 | unregister_chrdev_region(iio_devt, IIO_DEV_MAX); | |
467 | } | |
468 | ||
469 | static int __init iio_init(void) | |
470 | { | |
471 | int ret; | |
472 | ||
5aaaeba8 JC |
473 | /* Register sysfs bus */ |
474 | ret = bus_register(&iio_bus_type); | |
847ec80b JC |
475 | if (ret < 0) { |
476 | printk(KERN_ERR | |
5aaaeba8 | 477 | "%s could not register bus type\n", |
847ec80b JC |
478 | __FILE__); |
479 | goto error_nothing; | |
480 | } | |
481 | ||
482 | ret = iio_dev_init(); | |
483 | if (ret < 0) | |
5aaaeba8 | 484 | goto error_unregister_bus_type; |
847ec80b JC |
485 | |
486 | return 0; | |
487 | ||
5aaaeba8 JC |
488 | error_unregister_bus_type: |
489 | bus_unregister(&iio_bus_type); | |
847ec80b JC |
490 | error_nothing: |
491 | return ret; | |
492 | } | |
493 | ||
494 | static void __exit iio_exit(void) | |
495 | { | |
496 | iio_dev_exit(); | |
5aaaeba8 | 497 | bus_unregister(&iio_bus_type); |
847ec80b JC |
498 | } |
499 | ||
500 | static int iio_device_register_sysfs(struct iio_dev *dev_info) | |
501 | { | |
502 | int ret = 0; | |
503 | ||
504 | ret = sysfs_create_group(&dev_info->dev.kobj, dev_info->attrs); | |
505 | if (ret) { | |
506 | dev_err(dev_info->dev.parent, | |
507 | "Failed to register sysfs hooks\n"); | |
508 | goto error_ret; | |
509 | } | |
510 | ||
511 | if (dev_info->scan_el_attrs) { | |
512 | ret = sysfs_create_group(&dev_info->dev.kobj, | |
513 | dev_info->scan_el_attrs); | |
514 | if (ret) | |
515 | dev_err(&dev_info->dev, | |
516 | "Failed to add sysfs scan els\n"); | |
517 | } | |
518 | ||
519 | error_ret: | |
520 | return ret; | |
521 | } | |
522 | ||
523 | static void iio_device_unregister_sysfs(struct iio_dev *dev_info) | |
524 | { | |
525 | if (dev_info->scan_el_attrs) | |
526 | sysfs_remove_group(&dev_info->dev.kobj, | |
527 | dev_info->scan_el_attrs); | |
528 | ||
529 | sysfs_remove_group(&dev_info->dev.kobj, dev_info->attrs); | |
530 | } | |
531 | ||
f3cdc285 | 532 | /* Return a negative errno on failure */ |
847ec80b JC |
533 | int iio_get_new_idr_val(struct idr *this_idr) |
534 | { | |
535 | int ret; | |
536 | int val; | |
537 | ||
538 | idr_again: | |
539 | if (unlikely(idr_pre_get(this_idr, GFP_KERNEL) == 0)) | |
540 | return -ENOMEM; | |
541 | ||
542 | spin_lock(&iio_idr_lock); | |
543 | ret = idr_get_new(this_idr, NULL, &val); | |
544 | spin_unlock(&iio_idr_lock); | |
545 | if (unlikely(ret == -EAGAIN)) | |
546 | goto idr_again; | |
547 | else if (unlikely(ret)) | |
548 | return ret; | |
549 | ||
550 | return val; | |
551 | } | |
552 | EXPORT_SYMBOL(iio_get_new_idr_val); | |
553 | ||
554 | void iio_free_idr_val(struct idr *this_idr, int id) | |
555 | { | |
556 | spin_lock(&iio_idr_lock); | |
557 | idr_remove(this_idr, id); | |
558 | spin_unlock(&iio_idr_lock); | |
559 | } | |
560 | EXPORT_SYMBOL(iio_free_idr_val); | |
561 | ||
562 | static int iio_device_register_id(struct iio_dev *dev_info, | |
563 | struct idr *this_idr) | |
564 | { | |
565 | ||
566 | dev_info->id = iio_get_new_idr_val(&iio_idr); | |
567 | if (dev_info->id < 0) | |
568 | return dev_info->id; | |
569 | return 0; | |
570 | } | |
571 | ||
572 | static void iio_device_unregister_id(struct iio_dev *dev_info) | |
573 | { | |
574 | iio_free_idr_val(&iio_idr, dev_info->id); | |
575 | } | |
576 | ||
577 | static inline int __iio_add_event_config_attrs(struct iio_dev *dev_info, int i) | |
578 | { | |
579 | int ret; | |
580 | /*p for adding, q for removing */ | |
581 | struct attribute **attrp, **attrq; | |
582 | ||
583 | if (dev_info->event_conf_attrs && dev_info->event_conf_attrs[i].attrs) { | |
584 | attrp = dev_info->event_conf_attrs[i].attrs; | |
585 | while (*attrp) { | |
586 | ret = sysfs_add_file_to_group(&dev_info->dev.kobj, | |
587 | *attrp, | |
588 | dev_info | |
589 | ->event_attrs[i].name); | |
590 | if (ret) | |
591 | goto error_ret; | |
592 | attrp++; | |
593 | } | |
594 | } | |
595 | return 0; | |
596 | ||
597 | error_ret: | |
598 | attrq = dev_info->event_conf_attrs[i].attrs; | |
599 | while (attrq != attrp) { | |
600 | sysfs_remove_file_from_group(&dev_info->dev.kobj, | |
601 | *attrq, | |
602 | dev_info->event_attrs[i].name); | |
603 | attrq++; | |
604 | } | |
605 | ||
606 | return ret; | |
607 | } | |
608 | ||
609 | static inline int __iio_remove_event_config_attrs(struct iio_dev *dev_info, | |
610 | int i) | |
611 | { | |
612 | struct attribute **attrq; | |
613 | ||
614 | if (dev_info->event_conf_attrs | |
615 | && dev_info->event_conf_attrs[i].attrs) { | |
616 | attrq = dev_info->event_conf_attrs[i].attrs; | |
617 | while (*attrq) { | |
618 | sysfs_remove_file_from_group(&dev_info->dev.kobj, | |
619 | *attrq, | |
620 | dev_info | |
621 | ->event_attrs[i].name); | |
622 | attrq++; | |
623 | } | |
624 | } | |
625 | ||
626 | return 0; | |
627 | } | |
628 | ||
629 | static int iio_device_register_eventset(struct iio_dev *dev_info) | |
630 | { | |
631 | int ret = 0, i, j; | |
632 | ||
633 | if (dev_info->num_interrupt_lines == 0) | |
634 | return 0; | |
635 | ||
636 | dev_info->event_interfaces = | |
637 | kzalloc(sizeof(struct iio_event_interface) | |
638 | *dev_info->num_interrupt_lines, | |
639 | GFP_KERNEL); | |
640 | if (dev_info->event_interfaces == NULL) { | |
641 | ret = -ENOMEM; | |
642 | goto error_ret; | |
643 | } | |
644 | ||
645 | dev_info->interrupts = kzalloc(sizeof(struct iio_interrupt *) | |
646 | *dev_info->num_interrupt_lines, | |
647 | GFP_KERNEL); | |
648 | if (dev_info->interrupts == NULL) { | |
649 | ret = -ENOMEM; | |
650 | goto error_free_event_interfaces; | |
651 | } | |
652 | ||
653 | for (i = 0; i < dev_info->num_interrupt_lines; i++) { | |
654 | dev_info->event_interfaces[i].owner = dev_info->driver_module; | |
847ec80b JC |
655 | |
656 | snprintf(dev_info->event_interfaces[i]._name, 20, | |
ba5c6fba JC |
657 | "%s:event%d", |
658 | dev_name(&dev_info->dev), | |
3d550fba | 659 | i); |
847ec80b JC |
660 | |
661 | ret = iio_setup_ev_int(&dev_info->event_interfaces[i], | |
662 | (const char *)(dev_info | |
663 | ->event_interfaces[i] | |
664 | ._name), | |
665 | dev_info->driver_module, | |
666 | &dev_info->dev); | |
667 | if (ret) { | |
668 | dev_err(&dev_info->dev, | |
669 | "Could not get chrdev interface\n"); | |
847ec80b JC |
670 | goto error_free_setup_ev_ints; |
671 | } | |
847ec80b | 672 | |
5cba220b JC |
673 | dev_set_drvdata(&dev_info->event_interfaces[i].dev, |
674 | (void *)dev_info); | |
675 | ret = sysfs_create_group(&dev_info | |
676 | ->event_interfaces[i] | |
677 | .dev.kobj, | |
678 | &dev_info->event_attrs[i]); | |
679 | ||
847ec80b JC |
680 | if (ret) { |
681 | dev_err(&dev_info->dev, | |
682 | "Failed to register sysfs for event attrs"); | |
683 | goto error_remove_sysfs_interfaces; | |
684 | } | |
685 | } | |
686 | ||
687 | for (i = 0; i < dev_info->num_interrupt_lines; i++) { | |
688 | ret = __iio_add_event_config_attrs(dev_info, i); | |
689 | if (ret) | |
690 | goto error_unregister_config_attrs; | |
691 | } | |
692 | ||
693 | return 0; | |
694 | ||
695 | error_unregister_config_attrs: | |
696 | for (j = 0; j < i; j++) | |
697 | __iio_remove_event_config_attrs(dev_info, i); | |
698 | i = dev_info->num_interrupt_lines - 1; | |
699 | error_remove_sysfs_interfaces: | |
700 | for (j = 0; j < i; j++) | |
5cba220b JC |
701 | sysfs_remove_group(&dev_info |
702 | ->event_interfaces[j].dev.kobj, | |
847ec80b | 703 | &dev_info->event_attrs[j]); |
847ec80b | 704 | error_free_setup_ev_ints: |
3d550fba | 705 | for (j = 0; j < i; j++) |
847ec80b | 706 | iio_free_ev_int(&dev_info->event_interfaces[j]); |
847ec80b JC |
707 | kfree(dev_info->interrupts); |
708 | error_free_event_interfaces: | |
709 | kfree(dev_info->event_interfaces); | |
710 | error_ret: | |
711 | ||
712 | return ret; | |
713 | } | |
714 | ||
715 | static void iio_device_unregister_eventset(struct iio_dev *dev_info) | |
716 | { | |
717 | int i; | |
718 | ||
719 | if (dev_info->num_interrupt_lines == 0) | |
720 | return; | |
721 | for (i = 0; i < dev_info->num_interrupt_lines; i++) | |
5cba220b JC |
722 | sysfs_remove_group(&dev_info |
723 | ->event_interfaces[i].dev.kobj, | |
847ec80b JC |
724 | &dev_info->event_attrs[i]); |
725 | ||
3d550fba | 726 | for (i = 0; i < dev_info->num_interrupt_lines; i++) |
847ec80b | 727 | iio_free_ev_int(&dev_info->event_interfaces[i]); |
847ec80b JC |
728 | kfree(dev_info->interrupts); |
729 | kfree(dev_info->event_interfaces); | |
730 | } | |
731 | ||
732 | static void iio_dev_release(struct device *device) | |
733 | { | |
734 | struct iio_dev *dev = to_iio_dev(device); | |
735 | ||
736 | iio_put(); | |
737 | kfree(dev); | |
738 | } | |
739 | ||
740 | static struct device_type iio_dev_type = { | |
741 | .name = "iio_device", | |
742 | .release = iio_dev_release, | |
743 | }; | |
744 | ||
745 | struct iio_dev *iio_allocate_device(void) | |
746 | { | |
747 | struct iio_dev *dev = kzalloc(sizeof *dev, GFP_KERNEL); | |
748 | ||
749 | if (dev) { | |
750 | dev->dev.type = &iio_dev_type; | |
5aaaeba8 | 751 | dev->dev.bus = &iio_bus_type; |
847ec80b JC |
752 | device_initialize(&dev->dev); |
753 | dev_set_drvdata(&dev->dev, (void *)dev); | |
754 | mutex_init(&dev->mlock); | |
755 | iio_get(); | |
756 | } | |
757 | ||
758 | return dev; | |
759 | } | |
760 | EXPORT_SYMBOL(iio_allocate_device); | |
761 | ||
762 | void iio_free_device(struct iio_dev *dev) | |
763 | { | |
764 | if (dev) | |
765 | iio_put_device(dev); | |
766 | } | |
767 | EXPORT_SYMBOL(iio_free_device); | |
768 | ||
769 | int iio_device_register(struct iio_dev *dev_info) | |
770 | { | |
771 | int ret; | |
772 | ||
773 | ret = iio_device_register_id(dev_info, &iio_idr); | |
774 | if (ret) { | |
775 | dev_err(&dev_info->dev, "Failed to get id\n"); | |
776 | goto error_ret; | |
777 | } | |
778 | dev_set_name(&dev_info->dev, "device%d", dev_info->id); | |
779 | ||
780 | ret = device_add(&dev_info->dev); | |
781 | if (ret) | |
782 | goto error_free_idr; | |
783 | ret = iio_device_register_sysfs(dev_info); | |
784 | if (ret) { | |
785 | dev_err(dev_info->dev.parent, | |
786 | "Failed to register sysfs interfaces\n"); | |
787 | goto error_del_device; | |
788 | } | |
789 | ret = iio_device_register_eventset(dev_info); | |
790 | if (ret) { | |
791 | dev_err(dev_info->dev.parent, | |
c849d253 | 792 | "Failed to register event set\n"); |
847ec80b JC |
793 | goto error_free_sysfs; |
794 | } | |
795 | if (dev_info->modes & INDIO_RING_TRIGGERED) | |
796 | iio_device_register_trigger_consumer(dev_info); | |
797 | ||
798 | return 0; | |
799 | ||
800 | error_free_sysfs: | |
801 | iio_device_unregister_sysfs(dev_info); | |
802 | error_del_device: | |
803 | device_del(&dev_info->dev); | |
804 | error_free_idr: | |
805 | iio_device_unregister_id(dev_info); | |
806 | error_ret: | |
807 | return ret; | |
808 | } | |
809 | EXPORT_SYMBOL(iio_device_register); | |
810 | ||
811 | void iio_device_unregister(struct iio_dev *dev_info) | |
812 | { | |
813 | if (dev_info->modes & INDIO_RING_TRIGGERED) | |
814 | iio_device_unregister_trigger_consumer(dev_info); | |
815 | iio_device_unregister_eventset(dev_info); | |
816 | iio_device_unregister_sysfs(dev_info); | |
817 | iio_device_unregister_id(dev_info); | |
818 | device_unregister(&dev_info->dev); | |
819 | } | |
820 | EXPORT_SYMBOL(iio_device_unregister); | |
821 | ||
822 | void iio_put(void) | |
823 | { | |
824 | module_put(THIS_MODULE); | |
825 | } | |
826 | ||
827 | void iio_get(void) | |
828 | { | |
829 | __module_get(THIS_MODULE); | |
830 | } | |
831 | ||
832 | subsys_initcall(iio_init); | |
833 | module_exit(iio_exit); | |
834 | ||
835 | MODULE_AUTHOR("Jonathan Cameron <jic23@cam.ac.uk>"); | |
836 | MODULE_DESCRIPTION("Industrial I/O core"); | |
837 | MODULE_LICENSE("GPL"); |