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Jonathan Cameron1637db42009-08-18 18:06:26 +01001/* The industrial I/O core, trigger handling functions
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
10#include <linux/kernel.h>
Jonathan Cameron1637db42009-08-18 18:06:26 +010011#include <linux/idr.h>
12#include <linux/err.h>
13#include <linux/device.h>
14#include <linux/interrupt.h>
15#include <linux/list.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090016#include <linux/slab.h>
Jonathan Cameron1637db42009-08-18 18:06:26 +010017
Jonathan Cameron06458e22012-04-25 15:54:58 +010018#include <linux/iio/iio.h>
19#include <linux/iio/trigger.h>
Jonathan Camerondf9c1c42011-08-12 17:56:03 +010020#include "iio_core.h"
Jonathan Cameron6aea1c32011-08-24 17:28:38 +010021#include "iio_core_trigger.h"
Jonathan Cameron06458e22012-04-25 15:54:58 +010022#include <linux/iio/trigger_consumer.h>
Jonathan Cameron1637db42009-08-18 18:06:26 +010023
24/* RFC - Question of approach
25 * Make the common case (single sensor single trigger)
26 * simple by starting trigger capture from when first sensors
27 * is added.
28 *
29 * Complex simultaneous start requires use of 'hold' functionality
30 * of the trigger. (not implemented)
31 *
32 * Any other suggestions?
33 */
34
Jonathan Cameron47c24fd2011-08-30 12:41:07 +010035static DEFINE_IDA(iio_trigger_ida);
Jonathan Cameron1637db42009-08-18 18:06:26 +010036
37/* Single list of all available triggers */
38static LIST_HEAD(iio_trigger_list);
39static DEFINE_MUTEX(iio_trigger_list_lock);
40
41/**
Jonathan Cameron59c85e82011-05-18 14:42:22 +010042 * iio_trigger_read_name() - retrieve useful identifying name
43 **/
44static ssize_t iio_trigger_read_name(struct device *dev,
45 struct device_attribute *attr,
46 char *buf)
47{
Lars-Peter Clausen971ff1d2012-06-21 19:11:00 +020048 struct iio_trigger *trig = to_iio_trigger(dev);
Jonathan Cameron59c85e82011-05-18 14:42:22 +010049 return sprintf(buf, "%s\n", trig->name);
50}
51
52static DEVICE_ATTR(name, S_IRUGO, iio_trigger_read_name, NULL);
53
Lars-Peter Clausen6d459aa2012-07-05 10:57:06 +020054static struct attribute *iio_trig_dev_attrs[] = {
55 &dev_attr_name.attr,
56 NULL,
57};
Axel Linf59c2572013-12-02 02:57:00 +000058ATTRIBUTE_GROUPS(iio_trig_dev);
Jonathan Cameron1637db42009-08-18 18:06:26 +010059
Jonathan Cameron1637db42009-08-18 18:06:26 +010060int iio_trigger_register(struct iio_trigger *trig_info)
61{
62 int ret;
63
Jonathan Cameron47c24fd2011-08-30 12:41:07 +010064 trig_info->id = ida_simple_get(&iio_trigger_ida, 0, 0, GFP_KERNEL);
Hartmut Knaack92825ff2014-02-16 11:53:00 +000065 if (trig_info->id < 0)
66 return trig_info->id;
67
Jonathan Cameron1637db42009-08-18 18:06:26 +010068 /* Set the name used for the sysfs directory etc */
69 dev_set_name(&trig_info->dev, "trigger%ld",
70 (unsigned long) trig_info->id);
71
72 ret = device_add(&trig_info->dev);
73 if (ret)
74 goto error_unregister_id;
75
Jonathan Cameron1637db42009-08-18 18:06:26 +010076 /* Add to list of available triggers held by the IIO core */
77 mutex_lock(&iio_trigger_list_lock);
78 list_add_tail(&trig_info->list, &iio_trigger_list);
79 mutex_unlock(&iio_trigger_list_lock);
80
81 return 0;
82
Jonathan Cameron1637db42009-08-18 18:06:26 +010083error_unregister_id:
Jonathan Cameron47c24fd2011-08-30 12:41:07 +010084 ida_simple_remove(&iio_trigger_ida, trig_info->id);
Jonathan Cameron1637db42009-08-18 18:06:26 +010085 return ret;
86}
87EXPORT_SYMBOL(iio_trigger_register);
88
89void iio_trigger_unregister(struct iio_trigger *trig_info)
90{
Jonathan Cameron1637db42009-08-18 18:06:26 +010091 mutex_lock(&iio_trigger_list_lock);
Jonathan Cameron582e5482011-04-15 18:55:54 +010092 list_del(&trig_info->list);
Jonathan Cameron1637db42009-08-18 18:06:26 +010093 mutex_unlock(&iio_trigger_list_lock);
94
Jonathan Cameron47c24fd2011-08-30 12:41:07 +010095 ida_simple_remove(&iio_trigger_ida, trig_info->id);
Jonathan Cameron1637db42009-08-18 18:06:26 +010096 /* Possible issue in here */
Jonathan Cameron8bade402013-06-22 12:00:04 +010097 device_del(&trig_info->dev);
Jonathan Cameron1637db42009-08-18 18:06:26 +010098}
99EXPORT_SYMBOL(iio_trigger_unregister);
100
Jonathan Cameronf6517f22011-04-15 18:55:53 +0100101static struct iio_trigger *iio_trigger_find_by_name(const char *name,
102 size_t len)
Jonathan Cameron1637db42009-08-18 18:06:26 +0100103{
Jonathan Cameronf6517f22011-04-15 18:55:53 +0100104 struct iio_trigger *trig = NULL, *iter;
Michael Hennerich7c327852010-04-26 10:49:10 +0200105
Jonathan Cameron1637db42009-08-18 18:06:26 +0100106 mutex_lock(&iio_trigger_list_lock);
Jonathan Cameronf6517f22011-04-15 18:55:53 +0100107 list_for_each_entry(iter, &iio_trigger_list, list)
108 if (sysfs_streq(iter->name, name)) {
109 trig = iter;
Jonathan Cameron1637db42009-08-18 18:06:26 +0100110 break;
111 }
Jonathan Cameron1637db42009-08-18 18:06:26 +0100112 mutex_unlock(&iio_trigger_list_lock);
113
Jonathan Cameronf6517f22011-04-15 18:55:53 +0100114 return trig;
Jonathan Cameron5f874042010-05-04 22:20:54 +0100115}
Jonathan Cameron1637db42009-08-18 18:06:26 +0100116
Jonathan Cameron7b2c33b2010-07-11 16:39:11 +0100117void iio_trigger_poll(struct iio_trigger *trig, s64 time)
Jonathan Cameron1637db42009-08-18 18:06:26 +0100118{
Jonathan Camerond96d1332011-05-18 14:41:18 +0100119 int i;
Lars-Peter Clausena1a8e1d2013-07-16 15:28:00 +0100120
121 if (!atomic_read(&trig->use_count)) {
122 atomic_set(&trig->use_count, CONFIG_IIO_CONSUMERS_PER_TRIGGER);
123
124 for (i = 0; i < CONFIG_IIO_CONSUMERS_PER_TRIGGER; i++) {
125 if (trig->subirqs[i].enabled)
Jonathan Camerond96d1332011-05-18 14:41:18 +0100126 generic_handle_irq(trig->subirq_base + i);
Lars-Peter Clausena1a8e1d2013-07-16 15:28:00 +0100127 else
128 iio_trigger_notify_done(trig);
129 }
130 }
Jonathan Cameron1637db42009-08-18 18:06:26 +0100131}
132EXPORT_SYMBOL(iio_trigger_poll);
133
Jonathan Cameron8384d952011-05-18 14:41:21 +0100134irqreturn_t iio_trigger_generic_data_rdy_poll(int irq, void *private)
135{
136 iio_trigger_poll(private, iio_get_time_ns());
137 return IRQ_HANDLED;
138}
139EXPORT_SYMBOL(iio_trigger_generic_data_rdy_poll);
140
Jonathan Cameron1f785682011-05-18 14:42:11 +0100141void iio_trigger_poll_chained(struct iio_trigger *trig, s64 time)
142{
143 int i;
Lars-Peter Clausena1a8e1d2013-07-16 15:28:00 +0100144
145 if (!atomic_read(&trig->use_count)) {
146 atomic_set(&trig->use_count, CONFIG_IIO_CONSUMERS_PER_TRIGGER);
147
148 for (i = 0; i < CONFIG_IIO_CONSUMERS_PER_TRIGGER; i++) {
149 if (trig->subirqs[i].enabled)
Jonathan Cameron1f785682011-05-18 14:42:11 +0100150 handle_nested_irq(trig->subirq_base + i);
Lars-Peter Clausena1a8e1d2013-07-16 15:28:00 +0100151 else
152 iio_trigger_notify_done(trig);
153 }
154 }
Jonathan Cameron1f785682011-05-18 14:42:11 +0100155}
156EXPORT_SYMBOL(iio_trigger_poll_chained);
157
Jonathan Cameron1637db42009-08-18 18:06:26 +0100158void iio_trigger_notify_done(struct iio_trigger *trig)
159{
Lars-Peter Clausena1a8e1d2013-07-16 15:28:00 +0100160 if (atomic_dec_and_test(&trig->use_count) && trig->ops &&
161 trig->ops->try_reenable)
Jonathan Camerone69616b2011-10-26 17:27:39 +0100162 if (trig->ops->try_reenable(trig))
Peter Meerwald860c9c52013-02-04 11:36:00 +0000163 /* Missed an interrupt so launch new poll now */
Jonathan Cameron7b2c33b2010-07-11 16:39:11 +0100164 iio_trigger_poll(trig, 0);
Jonathan Cameron1637db42009-08-18 18:06:26 +0100165}
166EXPORT_SYMBOL(iio_trigger_notify_done);
167
Jonathan Cameron1637db42009-08-18 18:06:26 +0100168/* Trigger Consumer related functions */
Jonathan Cameron208b8132011-08-24 17:28:41 +0100169static int iio_trigger_get_irq(struct iio_trigger *trig)
170{
171 int ret;
172 mutex_lock(&trig->pool_lock);
173 ret = bitmap_find_free_region(trig->pool,
174 CONFIG_IIO_CONSUMERS_PER_TRIGGER,
175 ilog2(1));
176 mutex_unlock(&trig->pool_lock);
177 if (ret >= 0)
178 ret += trig->subirq_base;
179
180 return ret;
181}
182
183static void iio_trigger_put_irq(struct iio_trigger *trig, int irq)
184{
185 mutex_lock(&trig->pool_lock);
186 clear_bit(irq - trig->subirq_base, trig->pool);
187 mutex_unlock(&trig->pool_lock);
188}
Jonathan Cameron1637db42009-08-18 18:06:26 +0100189
190/* Complexity in here. With certain triggers (datardy) an acknowledgement
191 * may be needed if the pollfuncs do not include the data read for the
192 * triggering device.
193 * This is not currently handled. Alternative of not enabling trigger unless
194 * the relevant function is in there may be the best option.
195 */
Peter Meerwald860c9c52013-02-04 11:36:00 +0000196/* Worth protecting against double additions? */
Jonathan Cameron208b8132011-08-24 17:28:41 +0100197static int iio_trigger_attach_poll_func(struct iio_trigger *trig,
198 struct iio_poll_func *pf)
Jonathan Cameron1637db42009-08-18 18:06:26 +0100199{
200 int ret = 0;
Jonathan Cameron51c060a2011-05-18 14:41:42 +0100201 bool notinuse
202 = bitmap_empty(trig->pool, CONFIG_IIO_CONSUMERS_PER_TRIGGER);
Jonathan Cameron1637db42009-08-18 18:06:26 +0100203
Peter Meerwald860c9c52013-02-04 11:36:00 +0000204 /* Prevent the module from being removed whilst attached to a trigger */
Jonathan Cameronf60c4a02011-08-24 17:28:37 +0100205 __module_get(pf->indio_dev->info->driver_module);
Jonathan Cameron51c060a2011-05-18 14:41:42 +0100206 pf->irq = iio_trigger_get_irq(trig);
207 ret = request_threaded_irq(pf->irq, pf->h, pf->thread,
208 pf->type, pf->name,
209 pf);
Jonathan Cameron5dd72ec2011-10-26 17:27:41 +0100210 if (ret < 0) {
211 module_put(pf->indio_dev->info->driver_module);
212 return ret;
213 }
214
215 if (trig->ops && trig->ops->set_trigger_state && notinuse) {
Jonathan Camerond29f73d2011-08-12 17:08:38 +0100216 ret = trig->ops->set_trigger_state(trig, true);
Jonathan Cameron5dd72ec2011-10-26 17:27:41 +0100217 if (ret < 0)
218 module_put(pf->indio_dev->info->driver_module);
219 }
Jonathan Camerond96d1332011-05-18 14:41:18 +0100220
Jonathan Cameron1637db42009-08-18 18:06:26 +0100221 return ret;
222}
Jonathan Cameron1637db42009-08-18 18:06:26 +0100223
Peter Meerwald034bd7b2012-07-02 23:43:47 +0200224static int iio_trigger_detach_poll_func(struct iio_trigger *trig,
Jonathan Cameron208b8132011-08-24 17:28:41 +0100225 struct iio_poll_func *pf)
Jonathan Cameron1637db42009-08-18 18:06:26 +0100226{
Jonathan Cameron51c060a2011-05-18 14:41:42 +0100227 int ret = 0;
228 bool no_other_users
229 = (bitmap_weight(trig->pool,
230 CONFIG_IIO_CONSUMERS_PER_TRIGGER)
231 == 1);
Jonathan Camerond29f73d2011-08-12 17:08:38 +0100232 if (trig->ops && trig->ops->set_trigger_state && no_other_users) {
233 ret = trig->ops->set_trigger_state(trig, false);
Jonathan Cameron51c060a2011-05-18 14:41:42 +0100234 if (ret)
Hartmut Knaack92825ff2014-02-16 11:53:00 +0000235 return ret;
Jonathan Cameron1637db42009-08-18 18:06:26 +0100236 }
Jonathan Cameron51c060a2011-05-18 14:41:42 +0100237 iio_trigger_put_irq(trig, pf->irq);
238 free_irq(pf->irq, pf);
Jonathan Cameronf60c4a02011-08-24 17:28:37 +0100239 module_put(pf->indio_dev->info->driver_module);
Jonathan Cameron1637db42009-08-18 18:06:26 +0100240
Jonathan Cameron1637db42009-08-18 18:06:26 +0100241 return ret;
242}
Jonathan Cameron1637db42009-08-18 18:06:26 +0100243
Jonathan Camerond96d1332011-05-18 14:41:18 +0100244irqreturn_t iio_pollfunc_store_time(int irq, void *p)
245{
246 struct iio_poll_func *pf = p;
247 pf->timestamp = iio_get_time_ns();
248 return IRQ_WAKE_THREAD;
249}
250EXPORT_SYMBOL(iio_pollfunc_store_time);
251
Jonathan Cameron21b185f2011-05-18 14:42:32 +0100252struct iio_poll_func
253*iio_alloc_pollfunc(irqreturn_t (*h)(int irq, void *p),
254 irqreturn_t (*thread)(int irq, void *p),
255 int type,
Jonathan Camerone65bc6a2011-08-24 17:28:36 +0100256 struct iio_dev *indio_dev,
Jonathan Cameron21b185f2011-05-18 14:42:32 +0100257 const char *fmt,
258 ...)
259{
260 va_list vargs;
261 struct iio_poll_func *pf;
262
263 pf = kmalloc(sizeof *pf, GFP_KERNEL);
264 if (pf == NULL)
265 return NULL;
266 va_start(vargs, fmt);
267 pf->name = kvasprintf(GFP_KERNEL, fmt, vargs);
268 va_end(vargs);
269 if (pf->name == NULL) {
270 kfree(pf);
271 return NULL;
272 }
273 pf->h = h;
274 pf->thread = thread;
275 pf->type = type;
Jonathan Camerone65bc6a2011-08-24 17:28:36 +0100276 pf->indio_dev = indio_dev;
Jonathan Cameron21b185f2011-05-18 14:42:32 +0100277
278 return pf;
279}
280EXPORT_SYMBOL_GPL(iio_alloc_pollfunc);
281
282void iio_dealloc_pollfunc(struct iio_poll_func *pf)
283{
284 kfree(pf->name);
285 kfree(pf);
286}
287EXPORT_SYMBOL_GPL(iio_dealloc_pollfunc);
288
Jonathan Cameron1637db42009-08-18 18:06:26 +0100289/**
Peter Meerwald860c9c52013-02-04 11:36:00 +0000290 * iio_trigger_read_current() - trigger consumer sysfs query current trigger
Jonathan Cameron1637db42009-08-18 18:06:26 +0100291 *
292 * For trigger consumers the current_trigger interface allows the trigger
293 * used by the device to be queried.
294 **/
295static ssize_t iio_trigger_read_current(struct device *dev,
296 struct device_attribute *attr,
297 char *buf)
298{
Lars-Peter Clausene53f5ac2012-05-12 15:39:33 +0200299 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
Jonathan Cameroncb6c89a2011-08-24 17:28:40 +0100300
Jonathan Cameronf8c6f4e2011-10-06 17:14:35 +0100301 if (indio_dev->trig)
302 return sprintf(buf, "%s\n", indio_dev->trig->name);
Jonathan Cameroncb6c89a2011-08-24 17:28:40 +0100303 return 0;
Jonathan Cameron1637db42009-08-18 18:06:26 +0100304}
305
306/**
Peter Meerwald860c9c52013-02-04 11:36:00 +0000307 * iio_trigger_write_current() - trigger consumer sysfs set current trigger
Jonathan Cameron1637db42009-08-18 18:06:26 +0100308 *
309 * For trigger consumers the current_trigger interface allows the trigger
Peter Meerwald17666ef2013-11-12 21:49:00 +0000310 * used for this device to be specified at run time based on the trigger's
Jonathan Cameron1637db42009-08-18 18:06:26 +0100311 * name.
312 **/
313static ssize_t iio_trigger_write_current(struct device *dev,
314 struct device_attribute *attr,
315 const char *buf,
316 size_t len)
317{
Lars-Peter Clausene53f5ac2012-05-12 15:39:33 +0200318 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
Jonathan Cameronf8c6f4e2011-10-06 17:14:35 +0100319 struct iio_trigger *oldtrig = indio_dev->trig;
Michael Hennerich43a43602011-06-27 13:07:09 +0100320 struct iio_trigger *trig;
321 int ret;
322
Jonathan Cameronf8c6f4e2011-10-06 17:14:35 +0100323 mutex_lock(&indio_dev->mlock);
324 if (indio_dev->currentmode == INDIO_BUFFER_TRIGGERED) {
325 mutex_unlock(&indio_dev->mlock);
Jonathan Cameron1637db42009-08-18 18:06:26 +0100326 return -EBUSY;
327 }
Jonathan Cameronf8c6f4e2011-10-06 17:14:35 +0100328 mutex_unlock(&indio_dev->mlock);
Jonathan Cameron1637db42009-08-18 18:06:26 +0100329
Michael Hennerich43a43602011-06-27 13:07:09 +0100330 trig = iio_trigger_find_by_name(buf, len);
Jonathan Cameron5dd72ec2011-10-26 17:27:41 +0100331 if (oldtrig == trig)
332 return len;
Michael Hennerich43a43602011-06-27 13:07:09 +0100333
Jonathan Cameronf8c6f4e2011-10-06 17:14:35 +0100334 if (trig && indio_dev->info->validate_trigger) {
335 ret = indio_dev->info->validate_trigger(indio_dev, trig);
Michael Hennerich43a43602011-06-27 13:07:09 +0100336 if (ret)
337 return ret;
338 }
339
Jonathan Camerond29f73d2011-08-12 17:08:38 +0100340 if (trig && trig->ops && trig->ops->validate_device) {
Jonathan Cameronf8c6f4e2011-10-06 17:14:35 +0100341 ret = trig->ops->validate_device(trig, indio_dev);
Michael Hennerich43a43602011-06-27 13:07:09 +0100342 if (ret)
343 return ret;
344 }
345
Jonathan Cameronf8c6f4e2011-10-06 17:14:35 +0100346 indio_dev->trig = trig;
Michael Hennerich43a43602011-06-27 13:07:09 +0100347
Peter Meerwalda35e1fd2013-11-12 21:49:00 +0000348 if (oldtrig)
Lars-Peter Clausen7cbb7532012-04-26 13:35:01 +0200349 iio_trigger_put(oldtrig);
Jonathan Cameronf8c6f4e2011-10-06 17:14:35 +0100350 if (indio_dev->trig)
Lars-Peter Clausen7cbb7532012-04-26 13:35:01 +0200351 iio_trigger_get(indio_dev->trig);
Jonathan Cameron1637db42009-08-18 18:06:26 +0100352
353 return len;
354}
355
Greg Kroah-Hartman74112d32010-05-04 22:34:00 -0700356static DEVICE_ATTR(current_trigger, S_IRUGO | S_IWUSR,
357 iio_trigger_read_current,
358 iio_trigger_write_current);
Jonathan Cameron1637db42009-08-18 18:06:26 +0100359
360static struct attribute *iio_trigger_consumer_attrs[] = {
361 &dev_attr_current_trigger.attr,
362 NULL,
363};
364
365static const struct attribute_group iio_trigger_consumer_attr_group = {
366 .name = "trigger",
367 .attrs = iio_trigger_consumer_attrs,
368};
369
370static void iio_trig_release(struct device *device)
371{
372 struct iio_trigger *trig = to_iio_trigger(device);
Jonathan Camerond96d1332011-05-18 14:41:18 +0100373 int i;
374
375 if (trig->subirq_base) {
376 for (i = 0; i < CONFIG_IIO_CONSUMERS_PER_TRIGGER; i++) {
377 irq_modify_status(trig->subirq_base + i,
378 IRQ_NOAUTOEN,
379 IRQ_NOREQUEST | IRQ_NOPROBE);
380 irq_set_chip(trig->subirq_base + i,
381 NULL);
382 irq_set_handler(trig->subirq_base + i,
383 NULL);
384 }
385
386 irq_free_descs(trig->subirq_base,
387 CONFIG_IIO_CONSUMERS_PER_TRIGGER);
388 }
Jonathan Cameron59c85e82011-05-18 14:42:22 +0100389 kfree(trig->name);
Jonathan Cameron1637db42009-08-18 18:06:26 +0100390 kfree(trig);
Jonathan Cameron1637db42009-08-18 18:06:26 +0100391}
392
393static struct device_type iio_trig_type = {
394 .release = iio_trig_release,
Axel Linf59c2572013-12-02 02:57:00 +0000395 .groups = iio_trig_dev_groups,
Jonathan Cameron1637db42009-08-18 18:06:26 +0100396};
397
Jonathan Camerond96d1332011-05-18 14:41:18 +0100398static void iio_trig_subirqmask(struct irq_data *d)
399{
400 struct irq_chip *chip = irq_data_get_irq_chip(d);
401 struct iio_trigger *trig
402 = container_of(chip,
403 struct iio_trigger, subirq_chip);
404 trig->subirqs[d->irq - trig->subirq_base].enabled = false;
405}
406
407static void iio_trig_subirqunmask(struct irq_data *d)
408{
409 struct irq_chip *chip = irq_data_get_irq_chip(d);
410 struct iio_trigger *trig
411 = container_of(chip,
412 struct iio_trigger, subirq_chip);
413 trig->subirqs[d->irq - trig->subirq_base].enabled = true;
414}
415
Jacek Anaszewskid5363212013-08-16 14:11:00 +0100416static struct iio_trigger *viio_trigger_alloc(const char *fmt, va_list vargs)
Jonathan Cameron1637db42009-08-18 18:06:26 +0100417{
418 struct iio_trigger *trig;
419 trig = kzalloc(sizeof *trig, GFP_KERNEL);
420 if (trig) {
Jonathan Camerond96d1332011-05-18 14:41:18 +0100421 int i;
Jonathan Cameron1637db42009-08-18 18:06:26 +0100422 trig->dev.type = &iio_trig_type;
Jonathan Cameron5aaaeba2010-05-04 14:43:00 +0100423 trig->dev.bus = &iio_bus_type;
Jonathan Cameron1637db42009-08-18 18:06:26 +0100424 device_initialize(&trig->dev);
Jonathan Camerond96d1332011-05-18 14:41:18 +0100425
Jonathan Cameron59c85e82011-05-18 14:42:22 +0100426 mutex_init(&trig->pool_lock);
427 trig->subirq_base
428 = irq_alloc_descs(-1, 0,
429 CONFIG_IIO_CONSUMERS_PER_TRIGGER,
430 0);
431 if (trig->subirq_base < 0) {
432 kfree(trig);
433 return NULL;
434 }
Jacek Anaszewskid5363212013-08-16 14:11:00 +0100435
Jonathan Cameron59c85e82011-05-18 14:42:22 +0100436 trig->name = kvasprintf(GFP_KERNEL, fmt, vargs);
Jonathan Cameron59c85e82011-05-18 14:42:22 +0100437 if (trig->name == NULL) {
438 irq_free_descs(trig->subirq_base,
439 CONFIG_IIO_CONSUMERS_PER_TRIGGER);
440 kfree(trig);
441 return NULL;
442 }
443 trig->subirq_chip.name = trig->name;
444 trig->subirq_chip.irq_mask = &iio_trig_subirqmask;
445 trig->subirq_chip.irq_unmask = &iio_trig_subirqunmask;
446 for (i = 0; i < CONFIG_IIO_CONSUMERS_PER_TRIGGER; i++) {
447 irq_set_chip(trig->subirq_base + i,
448 &trig->subirq_chip);
449 irq_set_handler(trig->subirq_base + i,
450 &handle_simple_irq);
451 irq_modify_status(trig->subirq_base + i,
452 IRQ_NOREQUEST | IRQ_NOAUTOEN,
453 IRQ_NOPROBE);
Jonathan Camerond96d1332011-05-18 14:41:18 +0100454 }
Jonathan Cameron5f9c0352011-08-24 17:28:33 +0100455 get_device(&trig->dev);
Jonathan Cameron1637db42009-08-18 18:06:26 +0100456 }
Jacek Anaszewskid5363212013-08-16 14:11:00 +0100457
458 return trig;
459}
460
461struct iio_trigger *iio_trigger_alloc(const char *fmt, ...)
462{
463 struct iio_trigger *trig;
464 va_list vargs;
465
466 va_start(vargs, fmt);
467 trig = viio_trigger_alloc(fmt, vargs);
468 va_end(vargs);
469
Jonathan Cameron1637db42009-08-18 18:06:26 +0100470 return trig;
471}
Lars-Peter Clausen7cbb7532012-04-26 13:35:01 +0200472EXPORT_SYMBOL(iio_trigger_alloc);
Jonathan Cameron1637db42009-08-18 18:06:26 +0100473
Lars-Peter Clausen7cbb7532012-04-26 13:35:01 +0200474void iio_trigger_free(struct iio_trigger *trig)
Jonathan Cameron1637db42009-08-18 18:06:26 +0100475{
476 if (trig)
477 put_device(&trig->dev);
478}
Lars-Peter Clausen7cbb7532012-04-26 13:35:01 +0200479EXPORT_SYMBOL(iio_trigger_free);
Jonathan Cameron1637db42009-08-18 18:06:26 +0100480
Jacek Anaszewskid5363212013-08-16 14:11:00 +0100481static void devm_iio_trigger_release(struct device *dev, void *res)
482{
483 iio_trigger_free(*(struct iio_trigger **)res);
484}
485
486static int devm_iio_trigger_match(struct device *dev, void *res, void *data)
487{
488 struct iio_trigger **r = res;
489
490 if (!r || !*r) {
491 WARN_ON(!r || !*r);
492 return 0;
493 }
494
495 return *r == data;
496}
497
Sachin Kamata7e57dc2013-10-29 11:39:00 +0000498/**
499 * devm_iio_trigger_alloc - Resource-managed iio_trigger_alloc()
500 * @dev: Device to allocate iio_trigger for
501 * @fmt: trigger name format. If it includes format
502 * specifiers, the additional arguments following
503 * format are formatted and inserted in the resulting
504 * string replacing their respective specifiers.
505 *
506 * Managed iio_trigger_alloc. iio_trigger allocated with this function is
507 * automatically freed on driver detach.
508 *
509 * If an iio_trigger allocated with this function needs to be freed separately,
510 * devm_iio_trigger_free() must be used.
511 *
512 * RETURNS:
513 * Pointer to allocated iio_trigger on success, NULL on failure.
514 */
Jacek Anaszewskid5363212013-08-16 14:11:00 +0100515struct iio_trigger *devm_iio_trigger_alloc(struct device *dev,
516 const char *fmt, ...)
517{
518 struct iio_trigger **ptr, *trig;
519 va_list vargs;
520
521 ptr = devres_alloc(devm_iio_trigger_release, sizeof(*ptr),
522 GFP_KERNEL);
523 if (!ptr)
524 return NULL;
525
526 /* use raw alloc_dr for kmalloc caller tracing */
527 va_start(vargs, fmt);
528 trig = viio_trigger_alloc(fmt, vargs);
529 va_end(vargs);
530 if (trig) {
531 *ptr = trig;
532 devres_add(dev, ptr);
533 } else {
534 devres_free(ptr);
535 }
536
537 return trig;
538}
539EXPORT_SYMBOL_GPL(devm_iio_trigger_alloc);
540
Sachin Kamata7e57dc2013-10-29 11:39:00 +0000541/**
542 * devm_iio_trigger_free - Resource-managed iio_trigger_free()
543 * @dev: Device this iio_dev belongs to
544 * @iio_trig: the iio_trigger associated with the device
545 *
546 * Free iio_trigger allocated with devm_iio_trigger_alloc().
547 */
Jacek Anaszewskid5363212013-08-16 14:11:00 +0100548void devm_iio_trigger_free(struct device *dev, struct iio_trigger *iio_trig)
549{
550 int rc;
551
552 rc = devres_release(dev, devm_iio_trigger_release,
553 devm_iio_trigger_match, iio_trig);
554 WARN_ON(rc);
555}
556EXPORT_SYMBOL_GPL(devm_iio_trigger_free);
557
Jonathan Cameron67be8e32011-10-26 17:27:38 +0100558void iio_device_register_trigger_consumer(struct iio_dev *indio_dev)
Jonathan Cameron1637db42009-08-18 18:06:26 +0100559{
Jonathan Cameronf8c6f4e2011-10-06 17:14:35 +0100560 indio_dev->groups[indio_dev->groupcounter++] =
Jonathan Cameron26d25ae2011-09-02 17:14:40 +0100561 &iio_trigger_consumer_attr_group;
Jonathan Cameron1637db42009-08-18 18:06:26 +0100562}
Jonathan Cameron1637db42009-08-18 18:06:26 +0100563
Jonathan Cameronf8c6f4e2011-10-06 17:14:35 +0100564void iio_device_unregister_trigger_consumer(struct iio_dev *indio_dev)
Jonathan Cameron1637db42009-08-18 18:06:26 +0100565{
Peter Meerwald860c9c52013-02-04 11:36:00 +0000566 /* Clean up an associated but not attached trigger reference */
Jonathan Cameronf8c6f4e2011-10-06 17:14:35 +0100567 if (indio_dev->trig)
Lars-Peter Clausen7cbb7532012-04-26 13:35:01 +0200568 iio_trigger_put(indio_dev->trig);
Jonathan Cameron1637db42009-08-18 18:06:26 +0100569}
Jonathan Cameron1637db42009-08-18 18:06:26 +0100570
Jonathan Cameron3b99fb72011-09-21 11:15:53 +0100571int iio_triggered_buffer_postenable(struct iio_dev *indio_dev)
Jonathan Cameronc3db00c2010-07-11 16:39:10 +0100572{
Jonathan Cameron67be8e32011-10-26 17:27:38 +0100573 return iio_trigger_attach_poll_func(indio_dev->trig,
574 indio_dev->pollfunc);
Jonathan Cameronc3db00c2010-07-11 16:39:10 +0100575}
Jonathan Cameron3b99fb72011-09-21 11:15:53 +0100576EXPORT_SYMBOL(iio_triggered_buffer_postenable);
Jonathan Cameronc3db00c2010-07-11 16:39:10 +0100577
Jonathan Cameron3b99fb72011-09-21 11:15:53 +0100578int iio_triggered_buffer_predisable(struct iio_dev *indio_dev)
Jonathan Cameronc3db00c2010-07-11 16:39:10 +0100579{
Peter Meerwald034bd7b2012-07-02 23:43:47 +0200580 return iio_trigger_detach_poll_func(indio_dev->trig,
Jonathan Cameron67be8e32011-10-26 17:27:38 +0100581 indio_dev->pollfunc);
Jonathan Cameronc3db00c2010-07-11 16:39:10 +0100582}
Jonathan Cameron3b99fb72011-09-21 11:15:53 +0100583EXPORT_SYMBOL(iio_triggered_buffer_predisable);