1a980e046SJonathan Cameron /* Industrial I/O event handling 2a980e046SJonathan Cameron * 3a980e046SJonathan Cameron * Copyright (c) 2008 Jonathan Cameron 4a980e046SJonathan Cameron * 5a980e046SJonathan Cameron * This program is free software; you can redistribute it and/or modify it 6a980e046SJonathan Cameron * under the terms of the GNU General Public License version 2 as published by 7a980e046SJonathan Cameron * the Free Software Foundation. 8a980e046SJonathan Cameron * 9a980e046SJonathan Cameron * Based on elements of hwmon and input subsystems. 10a980e046SJonathan Cameron */ 11a980e046SJonathan Cameron 12a980e046SJonathan Cameron #include <linux/anon_inodes.h> 13a980e046SJonathan Cameron #include <linux/device.h> 14a980e046SJonathan Cameron #include <linux/fs.h> 15a980e046SJonathan Cameron #include <linux/kernel.h> 16a980e046SJonathan Cameron #include <linux/kfifo.h> 17a980e046SJonathan Cameron #include <linux/module.h> 18a980e046SJonathan Cameron #include <linux/poll.h> 19a980e046SJonathan Cameron #include <linux/sched.h> 20a980e046SJonathan Cameron #include <linux/slab.h> 21a980e046SJonathan Cameron #include <linux/uaccess.h> 22a980e046SJonathan Cameron #include <linux/wait.h> 23a980e046SJonathan Cameron #include <linux/iio/iio.h> 24a980e046SJonathan Cameron #include "iio_core.h" 25a980e046SJonathan Cameron #include <linux/iio/sysfs.h> 26a980e046SJonathan Cameron #include <linux/iio/events.h> 27a980e046SJonathan Cameron 28a980e046SJonathan Cameron /** 29a980e046SJonathan Cameron * struct iio_event_interface - chrdev interface for an event line 30a980e046SJonathan Cameron * @wait: wait queue to allow blocking reads of events 31a980e046SJonathan Cameron * @det_events: list of detected events 32a980e046SJonathan Cameron * @dev_attr_list: list of event interface sysfs attribute 33a980e046SJonathan Cameron * @flags: file operations related flags including busy flag. 34a980e046SJonathan Cameron * @group: event interface sysfs attribute group 35a316c01dSCristina Opriceana * @read_lock: lock to protect kfifo read operations 36a980e046SJonathan Cameron */ 37a980e046SJonathan Cameron struct iio_event_interface { 38a980e046SJonathan Cameron wait_queue_head_t wait; 39a980e046SJonathan Cameron DECLARE_KFIFO(det_events, struct iio_event_data, 16); 40a980e046SJonathan Cameron 41a980e046SJonathan Cameron struct list_head dev_attr_list; 42a980e046SJonathan Cameron unsigned long flags; 43a980e046SJonathan Cameron struct attribute_group group; 44b91accafSLars-Peter Clausen struct mutex read_lock; 45a980e046SJonathan Cameron }; 46a980e046SJonathan Cameron 47bc2b7dabSGregor Boirie bool iio_event_enabled(const struct iio_event_interface *ev_int) 48bc2b7dabSGregor Boirie { 49bc2b7dabSGregor Boirie return !!test_bit(IIO_BUSY_BIT_POS, &ev_int->flags); 50bc2b7dabSGregor Boirie } 51bc2b7dabSGregor Boirie 52a7e57dceSSachin Kamat /** 53a7e57dceSSachin Kamat * iio_push_event() - try to add event to the list for userspace reading 54a7e57dceSSachin Kamat * @indio_dev: IIO device structure 55a7e57dceSSachin Kamat * @ev_code: What event 56a7e57dceSSachin Kamat * @timestamp: When the event occurred 57b91accafSLars-Peter Clausen * 58b91accafSLars-Peter Clausen * Note: The caller must make sure that this function is not running 59b91accafSLars-Peter Clausen * concurrently for the same indio_dev more than once. 604b1a9380SLars-Peter Clausen * 614b1a9380SLars-Peter Clausen * This function may be safely used as soon as a valid reference to iio_dev has 624b1a9380SLars-Peter Clausen * been obtained via iio_device_alloc(), but any events that are submitted 634b1a9380SLars-Peter Clausen * before iio_device_register() has successfully completed will be silently 644b1a9380SLars-Peter Clausen * discarded. 65a7e57dceSSachin Kamat **/ 66a980e046SJonathan Cameron int iio_push_event(struct iio_dev *indio_dev, u64 ev_code, s64 timestamp) 67a980e046SJonathan Cameron { 68a980e046SJonathan Cameron struct iio_event_interface *ev_int = indio_dev->event_interface; 69a980e046SJonathan Cameron struct iio_event_data ev; 70a980e046SJonathan Cameron int copied; 71a980e046SJonathan Cameron 724b1a9380SLars-Peter Clausen if (!ev_int) 734b1a9380SLars-Peter Clausen return 0; 744b1a9380SLars-Peter Clausen 75a980e046SJonathan Cameron /* Does anyone care? */ 76bc2b7dabSGregor Boirie if (iio_event_enabled(ev_int)) { 77a980e046SJonathan Cameron 78a980e046SJonathan Cameron ev.id = ev_code; 79a980e046SJonathan Cameron ev.timestamp = timestamp; 80a980e046SJonathan Cameron 81498d319bSStefani Seibold copied = kfifo_put(&ev_int->det_events, ev); 82a980e046SJonathan Cameron if (copied != 0) 83b91accafSLars-Peter Clausen wake_up_poll(&ev_int->wait, POLLIN); 84a980e046SJonathan Cameron } 85a980e046SJonathan Cameron 86a980e046SJonathan Cameron return 0; 87a980e046SJonathan Cameron } 88a980e046SJonathan Cameron EXPORT_SYMBOL(iio_push_event); 89a980e046SJonathan Cameron 90a980e046SJonathan Cameron /** 91a980e046SJonathan Cameron * iio_event_poll() - poll the event queue to find out if it has data 92a316c01dSCristina Opriceana * @filep: File structure pointer to identify the device 93a316c01dSCristina Opriceana * @wait: Poll table pointer to add the wait queue on 94a316c01dSCristina Opriceana * 95a316c01dSCristina Opriceana * Return: (POLLIN | POLLRDNORM) if data is available for reading 96a316c01dSCristina Opriceana * or a negative error code on failure 97a980e046SJonathan Cameron */ 98afc9a42bSAl Viro static __poll_t iio_event_poll(struct file *filep, 99a980e046SJonathan Cameron struct poll_table_struct *wait) 100a980e046SJonathan Cameron { 101cadc2125SLars-Peter Clausen struct iio_dev *indio_dev = filep->private_data; 102cadc2125SLars-Peter Clausen struct iio_event_interface *ev_int = indio_dev->event_interface; 103afc9a42bSAl Viro __poll_t events = 0; 104a980e046SJonathan Cameron 105f18e7a06SLars-Peter Clausen if (!indio_dev->info) 10641d903c0SCristina Opriceana return events; 107f18e7a06SLars-Peter Clausen 108a980e046SJonathan Cameron poll_wait(filep, &ev_int->wait, wait); 109a980e046SJonathan Cameron 110a980e046SJonathan Cameron if (!kfifo_is_empty(&ev_int->det_events)) 111a980e046SJonathan Cameron events = POLLIN | POLLRDNORM; 112a980e046SJonathan Cameron 113a980e046SJonathan Cameron return events; 114a980e046SJonathan Cameron } 115a980e046SJonathan Cameron 116a980e046SJonathan Cameron static ssize_t iio_event_chrdev_read(struct file *filep, 117a980e046SJonathan Cameron char __user *buf, 118a980e046SJonathan Cameron size_t count, 119a980e046SJonathan Cameron loff_t *f_ps) 120a980e046SJonathan Cameron { 121cadc2125SLars-Peter Clausen struct iio_dev *indio_dev = filep->private_data; 122cadc2125SLars-Peter Clausen struct iio_event_interface *ev_int = indio_dev->event_interface; 123a980e046SJonathan Cameron unsigned int copied; 124a980e046SJonathan Cameron int ret; 125a980e046SJonathan Cameron 126f18e7a06SLars-Peter Clausen if (!indio_dev->info) 127f18e7a06SLars-Peter Clausen return -ENODEV; 128f18e7a06SLars-Peter Clausen 129a980e046SJonathan Cameron if (count < sizeof(struct iio_event_data)) 130a980e046SJonathan Cameron return -EINVAL; 131a980e046SJonathan Cameron 132b91accafSLars-Peter Clausen do { 133a980e046SJonathan Cameron if (kfifo_is_empty(&ev_int->det_events)) { 134b91accafSLars-Peter Clausen if (filep->f_flags & O_NONBLOCK) 135b91accafSLars-Peter Clausen return -EAGAIN; 136b91accafSLars-Peter Clausen 137b91accafSLars-Peter Clausen ret = wait_event_interruptible(ev_int->wait, 138d2f0a48fSLars-Peter Clausen !kfifo_is_empty(&ev_int->det_events) || 139d2f0a48fSLars-Peter Clausen indio_dev->info == NULL); 140a980e046SJonathan Cameron if (ret) 141b91accafSLars-Peter Clausen return ret; 142b91accafSLars-Peter Clausen if (indio_dev->info == NULL) 143b91accafSLars-Peter Clausen return -ENODEV; 144a980e046SJonathan Cameron } 145a980e046SJonathan Cameron 146b91accafSLars-Peter Clausen if (mutex_lock_interruptible(&ev_int->read_lock)) 147b91accafSLars-Peter Clausen return -ERESTARTSYS; 148a980e046SJonathan Cameron ret = kfifo_to_user(&ev_int->det_events, buf, count, &copied); 149b91accafSLars-Peter Clausen mutex_unlock(&ev_int->read_lock); 150a980e046SJonathan Cameron 151b91accafSLars-Peter Clausen if (ret) 152b91accafSLars-Peter Clausen return ret; 153a980e046SJonathan Cameron 154b91accafSLars-Peter Clausen /* 155b91accafSLars-Peter Clausen * If we couldn't read anything from the fifo (a different 156b91accafSLars-Peter Clausen * thread might have been faster) we either return -EAGAIN if 157b91accafSLars-Peter Clausen * the file descriptor is non-blocking, otherwise we go back to 158b91accafSLars-Peter Clausen * sleep and wait for more data to arrive. 159b91accafSLars-Peter Clausen */ 160b91accafSLars-Peter Clausen if (copied == 0 && (filep->f_flags & O_NONBLOCK)) 161b91accafSLars-Peter Clausen return -EAGAIN; 162b91accafSLars-Peter Clausen 163b91accafSLars-Peter Clausen } while (copied == 0); 164b91accafSLars-Peter Clausen 165b91accafSLars-Peter Clausen return copied; 166a980e046SJonathan Cameron } 167a980e046SJonathan Cameron 168a980e046SJonathan Cameron static int iio_event_chrdev_release(struct inode *inode, struct file *filep) 169a980e046SJonathan Cameron { 170cadc2125SLars-Peter Clausen struct iio_dev *indio_dev = filep->private_data; 171cadc2125SLars-Peter Clausen struct iio_event_interface *ev_int = indio_dev->event_interface; 172a980e046SJonathan Cameron 173b91accafSLars-Peter Clausen clear_bit(IIO_BUSY_BIT_POS, &ev_int->flags); 174a980e046SJonathan Cameron 175cadc2125SLars-Peter Clausen iio_device_put(indio_dev); 176cadc2125SLars-Peter Clausen 177a980e046SJonathan Cameron return 0; 178a980e046SJonathan Cameron } 179a980e046SJonathan Cameron 180a980e046SJonathan Cameron static const struct file_operations iio_event_chrdev_fileops = { 181a980e046SJonathan Cameron .read = iio_event_chrdev_read, 182a980e046SJonathan Cameron .poll = iio_event_poll, 183a980e046SJonathan Cameron .release = iio_event_chrdev_release, 184a980e046SJonathan Cameron .owner = THIS_MODULE, 185a980e046SJonathan Cameron .llseek = noop_llseek, 186a980e046SJonathan Cameron }; 187a980e046SJonathan Cameron 188a980e046SJonathan Cameron int iio_event_getfd(struct iio_dev *indio_dev) 189a980e046SJonathan Cameron { 190a980e046SJonathan Cameron struct iio_event_interface *ev_int = indio_dev->event_interface; 191a980e046SJonathan Cameron int fd; 192a980e046SJonathan Cameron 193a980e046SJonathan Cameron if (ev_int == NULL) 194a980e046SJonathan Cameron return -ENODEV; 195a980e046SJonathan Cameron 196bc2b7dabSGregor Boirie fd = mutex_lock_interruptible(&indio_dev->mlock); 197bc2b7dabSGregor Boirie if (fd) 198bc2b7dabSGregor Boirie return fd; 199bc2b7dabSGregor Boirie 200bc2b7dabSGregor Boirie if (test_and_set_bit(IIO_BUSY_BIT_POS, &ev_int->flags)) { 201bc2b7dabSGregor Boirie fd = -EBUSY; 202bc2b7dabSGregor Boirie goto unlock; 203bc2b7dabSGregor Boirie } 204b91accafSLars-Peter Clausen 205cadc2125SLars-Peter Clausen iio_device_get(indio_dev); 206cadc2125SLars-Peter Clausen 207cadc2125SLars-Peter Clausen fd = anon_inode_getfd("iio:event", &iio_event_chrdev_fileops, 208e2aad1d5SGreg Kroah-Hartman indio_dev, O_RDONLY | O_CLOEXEC); 209a980e046SJonathan Cameron if (fd < 0) { 210b91accafSLars-Peter Clausen clear_bit(IIO_BUSY_BIT_POS, &ev_int->flags); 211cadc2125SLars-Peter Clausen iio_device_put(indio_dev); 212b91accafSLars-Peter Clausen } else { 213b91accafSLars-Peter Clausen kfifo_reset_out(&ev_int->det_events); 214a980e046SJonathan Cameron } 215b91accafSLars-Peter Clausen 216bc2b7dabSGregor Boirie unlock: 217bc2b7dabSGregor Boirie mutex_unlock(&indio_dev->mlock); 218a980e046SJonathan Cameron return fd; 219a980e046SJonathan Cameron } 220a980e046SJonathan Cameron 221a980e046SJonathan Cameron static const char * const iio_ev_type_text[] = { 222a980e046SJonathan Cameron [IIO_EV_TYPE_THRESH] = "thresh", 223a980e046SJonathan Cameron [IIO_EV_TYPE_MAG] = "mag", 224a980e046SJonathan Cameron [IIO_EV_TYPE_ROC] = "roc", 225a980e046SJonathan Cameron [IIO_EV_TYPE_THRESH_ADAPTIVE] = "thresh_adaptive", 226a980e046SJonathan Cameron [IIO_EV_TYPE_MAG_ADAPTIVE] = "mag_adaptive", 22727be8423SIrina Tirdea [IIO_EV_TYPE_CHANGE] = "change", 228a980e046SJonathan Cameron }; 229a980e046SJonathan Cameron 230a980e046SJonathan Cameron static const char * const iio_ev_dir_text[] = { 231a980e046SJonathan Cameron [IIO_EV_DIR_EITHER] = "either", 232a980e046SJonathan Cameron [IIO_EV_DIR_RISING] = "rising", 233a980e046SJonathan Cameron [IIO_EV_DIR_FALLING] = "falling" 234a980e046SJonathan Cameron }; 235a980e046SJonathan Cameron 236b4e3ac0aSLars-Peter Clausen static const char * const iio_ev_info_text[] = { 237b4e3ac0aSLars-Peter Clausen [IIO_EV_INFO_ENABLE] = "en", 238b4e3ac0aSLars-Peter Clausen [IIO_EV_INFO_VALUE] = "value", 239ec6670aeSLars-Peter Clausen [IIO_EV_INFO_HYSTERESIS] = "hysteresis", 24077a533c7SSrinivas Pandruvada [IIO_EV_INFO_PERIOD] = "period", 2413f7f642bSMartin Fuzzey [IIO_EV_INFO_HIGH_PASS_FILTER_3DB] = "high_pass_filter_3db", 2423f7f642bSMartin Fuzzey [IIO_EV_INFO_LOW_PASS_FILTER_3DB] = "low_pass_filter_3db", 243b4e3ac0aSLars-Peter Clausen }; 244b4e3ac0aSLars-Peter Clausen 245b4e3ac0aSLars-Peter Clausen static enum iio_event_direction iio_ev_attr_dir(struct iio_dev_attr *attr) 246b4e3ac0aSLars-Peter Clausen { 247b4e3ac0aSLars-Peter Clausen return attr->c->event_spec[attr->address & 0xffff].dir; 248b4e3ac0aSLars-Peter Clausen } 249b4e3ac0aSLars-Peter Clausen 250b4e3ac0aSLars-Peter Clausen static enum iio_event_type iio_ev_attr_type(struct iio_dev_attr *attr) 251b4e3ac0aSLars-Peter Clausen { 252b4e3ac0aSLars-Peter Clausen return attr->c->event_spec[attr->address & 0xffff].type; 253b4e3ac0aSLars-Peter Clausen } 254b4e3ac0aSLars-Peter Clausen 255b4e3ac0aSLars-Peter Clausen static enum iio_event_info iio_ev_attr_info(struct iio_dev_attr *attr) 256b4e3ac0aSLars-Peter Clausen { 257b4e3ac0aSLars-Peter Clausen return (attr->address >> 16) & 0xffff; 258b4e3ac0aSLars-Peter Clausen } 259b4e3ac0aSLars-Peter Clausen 260a980e046SJonathan Cameron static ssize_t iio_ev_state_store(struct device *dev, 261a980e046SJonathan Cameron struct device_attribute *attr, 262a980e046SJonathan Cameron const char *buf, 263a980e046SJonathan Cameron size_t len) 264a980e046SJonathan Cameron { 265e53f5ac5SLars-Peter Clausen struct iio_dev *indio_dev = dev_to_iio_dev(dev); 266a980e046SJonathan Cameron struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); 267a980e046SJonathan Cameron int ret; 268a980e046SJonathan Cameron bool val; 269a980e046SJonathan Cameron 270a980e046SJonathan Cameron ret = strtobool(buf, &val); 271a980e046SJonathan Cameron if (ret < 0) 272a980e046SJonathan Cameron return ret; 273a980e046SJonathan Cameron 274a980e046SJonathan Cameron ret = indio_dev->info->write_event_config(indio_dev, 275b4e3ac0aSLars-Peter Clausen this_attr->c, iio_ev_attr_type(this_attr), 276b4e3ac0aSLars-Peter Clausen iio_ev_attr_dir(this_attr), val); 277b4e3ac0aSLars-Peter Clausen 278a980e046SJonathan Cameron return (ret < 0) ? ret : len; 279a980e046SJonathan Cameron } 280a980e046SJonathan Cameron 281a980e046SJonathan Cameron static ssize_t iio_ev_state_show(struct device *dev, 282a980e046SJonathan Cameron struct device_attribute *attr, 283a980e046SJonathan Cameron char *buf) 284a980e046SJonathan Cameron { 285e53f5ac5SLars-Peter Clausen struct iio_dev *indio_dev = dev_to_iio_dev(dev); 286a980e046SJonathan Cameron struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); 287b4e3ac0aSLars-Peter Clausen int val; 288a980e046SJonathan Cameron 289b4e3ac0aSLars-Peter Clausen val = indio_dev->info->read_event_config(indio_dev, 290b4e3ac0aSLars-Peter Clausen this_attr->c, iio_ev_attr_type(this_attr), 291b4e3ac0aSLars-Peter Clausen iio_ev_attr_dir(this_attr)); 292a980e046SJonathan Cameron if (val < 0) 293a980e046SJonathan Cameron return val; 294a980e046SJonathan Cameron else 295a980e046SJonathan Cameron return sprintf(buf, "%d\n", val); 296a980e046SJonathan Cameron } 297a980e046SJonathan Cameron 298a980e046SJonathan Cameron static ssize_t iio_ev_value_show(struct device *dev, 299a980e046SJonathan Cameron struct device_attribute *attr, 300a980e046SJonathan Cameron char *buf) 301a980e046SJonathan Cameron { 302e53f5ac5SLars-Peter Clausen struct iio_dev *indio_dev = dev_to_iio_dev(dev); 303a980e046SJonathan Cameron struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); 3049fbfb4b3SSrinivas Pandruvada int val, val2, val_arr[2]; 305b4e3ac0aSLars-Peter Clausen int ret; 306a980e046SJonathan Cameron 307a980e046SJonathan Cameron ret = indio_dev->info->read_event_value(indio_dev, 308b4e3ac0aSLars-Peter Clausen this_attr->c, iio_ev_attr_type(this_attr), 309b4e3ac0aSLars-Peter Clausen iio_ev_attr_dir(this_attr), iio_ev_attr_info(this_attr), 310b4e3ac0aSLars-Peter Clausen &val, &val2); 311b4e3ac0aSLars-Peter Clausen if (ret < 0) 312b4e3ac0aSLars-Peter Clausen return ret; 3139fbfb4b3SSrinivas Pandruvada val_arr[0] = val; 3149fbfb4b3SSrinivas Pandruvada val_arr[1] = val2; 3159fbfb4b3SSrinivas Pandruvada return iio_format_value(buf, ret, 2, val_arr); 316b4e3ac0aSLars-Peter Clausen } 317a980e046SJonathan Cameron 318a980e046SJonathan Cameron static ssize_t iio_ev_value_store(struct device *dev, 319a980e046SJonathan Cameron struct device_attribute *attr, 320a980e046SJonathan Cameron const char *buf, 321a980e046SJonathan Cameron size_t len) 322a980e046SJonathan Cameron { 323e53f5ac5SLars-Peter Clausen struct iio_dev *indio_dev = dev_to_iio_dev(dev); 324a980e046SJonathan Cameron struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); 325b4e3ac0aSLars-Peter Clausen int val, val2; 326a980e046SJonathan Cameron int ret; 327a980e046SJonathan Cameron 328cb955852SLars-Peter Clausen if (!indio_dev->info->write_event_value) 329a980e046SJonathan Cameron return -EINVAL; 330a980e046SJonathan Cameron 331b4e3ac0aSLars-Peter Clausen ret = iio_str_to_fixpoint(buf, 100000, &val, &val2); 332b4e3ac0aSLars-Peter Clausen if (ret) 333b4e3ac0aSLars-Peter Clausen return ret; 334cb955852SLars-Peter Clausen ret = indio_dev->info->write_event_value(indio_dev, 335b4e3ac0aSLars-Peter Clausen this_attr->c, iio_ev_attr_type(this_attr), 336b4e3ac0aSLars-Peter Clausen iio_ev_attr_dir(this_attr), iio_ev_attr_info(this_attr), 337b4e3ac0aSLars-Peter Clausen val, val2); 338a980e046SJonathan Cameron if (ret < 0) 339a980e046SJonathan Cameron return ret; 340a980e046SJonathan Cameron 341a980e046SJonathan Cameron return len; 342a980e046SJonathan Cameron } 343a980e046SJonathan Cameron 344b4e3ac0aSLars-Peter Clausen static int iio_device_add_event(struct iio_dev *indio_dev, 345b4e3ac0aSLars-Peter Clausen const struct iio_chan_spec *chan, unsigned int spec_index, 346b4e3ac0aSLars-Peter Clausen enum iio_event_type type, enum iio_event_direction dir, 347b4e3ac0aSLars-Peter Clausen enum iio_shared_by shared_by, const unsigned long *mask) 348b4e3ac0aSLars-Peter Clausen { 349b4e3ac0aSLars-Peter Clausen ssize_t (*show)(struct device *, struct device_attribute *, char *); 350b4e3ac0aSLars-Peter Clausen ssize_t (*store)(struct device *, struct device_attribute *, 351b4e3ac0aSLars-Peter Clausen const char *, size_t); 352b4e3ac0aSLars-Peter Clausen unsigned int attrcount = 0; 353b4e3ac0aSLars-Peter Clausen unsigned int i; 354b4e3ac0aSLars-Peter Clausen char *postfix; 355b4e3ac0aSLars-Peter Clausen int ret; 356b4e3ac0aSLars-Peter Clausen 357ef4b4856SJonathan Cameron for_each_set_bit(i, mask, sizeof(*mask)*8) { 358ef4b4856SJonathan Cameron if (i >= ARRAY_SIZE(iio_ev_info_text)) 359ef4b4856SJonathan Cameron return -EINVAL; 3601843c2f3SIrina Tirdea if (dir != IIO_EV_DIR_NONE) 361b4e3ac0aSLars-Peter Clausen postfix = kasprintf(GFP_KERNEL, "%s_%s_%s", 3621843c2f3SIrina Tirdea iio_ev_type_text[type], 3631843c2f3SIrina Tirdea iio_ev_dir_text[dir], 3641843c2f3SIrina Tirdea iio_ev_info_text[i]); 3651843c2f3SIrina Tirdea else 3661843c2f3SIrina Tirdea postfix = kasprintf(GFP_KERNEL, "%s_%s", 3671843c2f3SIrina Tirdea iio_ev_type_text[type], 368b4e3ac0aSLars-Peter Clausen iio_ev_info_text[i]); 369b4e3ac0aSLars-Peter Clausen if (postfix == NULL) 370b4e3ac0aSLars-Peter Clausen return -ENOMEM; 371b4e3ac0aSLars-Peter Clausen 372b4e3ac0aSLars-Peter Clausen if (i == IIO_EV_INFO_ENABLE) { 373b4e3ac0aSLars-Peter Clausen show = iio_ev_state_show; 374b4e3ac0aSLars-Peter Clausen store = iio_ev_state_store; 375b4e3ac0aSLars-Peter Clausen } else { 376b4e3ac0aSLars-Peter Clausen show = iio_ev_value_show; 377b4e3ac0aSLars-Peter Clausen store = iio_ev_value_store; 378b4e3ac0aSLars-Peter Clausen } 379b4e3ac0aSLars-Peter Clausen 380b4e3ac0aSLars-Peter Clausen ret = __iio_add_chan_devattr(postfix, chan, show, store, 381b4e3ac0aSLars-Peter Clausen (i << 16) | spec_index, shared_by, &indio_dev->dev, 382b4e3ac0aSLars-Peter Clausen &indio_dev->event_interface->dev_attr_list); 383b4e3ac0aSLars-Peter Clausen kfree(postfix); 384b4e3ac0aSLars-Peter Clausen 38578b33216SSrinivas Pandruvada if ((ret == -EBUSY) && (shared_by != IIO_SEPARATE)) 38678b33216SSrinivas Pandruvada continue; 38778b33216SSrinivas Pandruvada 388b4e3ac0aSLars-Peter Clausen if (ret) 389b4e3ac0aSLars-Peter Clausen return ret; 390b4e3ac0aSLars-Peter Clausen 391b4e3ac0aSLars-Peter Clausen attrcount++; 392b4e3ac0aSLars-Peter Clausen } 393b4e3ac0aSLars-Peter Clausen 394b4e3ac0aSLars-Peter Clausen return attrcount; 395b4e3ac0aSLars-Peter Clausen } 396b4e3ac0aSLars-Peter Clausen 397cb955852SLars-Peter Clausen static int iio_device_add_event_sysfs(struct iio_dev *indio_dev, 398b4e3ac0aSLars-Peter Clausen struct iio_chan_spec const *chan) 399b4e3ac0aSLars-Peter Clausen { 400b4e3ac0aSLars-Peter Clausen int ret = 0, i, attrcount = 0; 401b4e3ac0aSLars-Peter Clausen enum iio_event_direction dir; 402b4e3ac0aSLars-Peter Clausen enum iio_event_type type; 403b4e3ac0aSLars-Peter Clausen 404b4e3ac0aSLars-Peter Clausen for (i = 0; i < chan->num_event_specs; i++) { 405b4e3ac0aSLars-Peter Clausen type = chan->event_spec[i].type; 406b4e3ac0aSLars-Peter Clausen dir = chan->event_spec[i].dir; 407b4e3ac0aSLars-Peter Clausen 408b4e3ac0aSLars-Peter Clausen ret = iio_device_add_event(indio_dev, chan, i, type, dir, 409b4e3ac0aSLars-Peter Clausen IIO_SEPARATE, &chan->event_spec[i].mask_separate); 410b4e3ac0aSLars-Peter Clausen if (ret < 0) 41192825ff9SHartmut Knaack return ret; 412b4e3ac0aSLars-Peter Clausen attrcount += ret; 413b4e3ac0aSLars-Peter Clausen 414b4e3ac0aSLars-Peter Clausen ret = iio_device_add_event(indio_dev, chan, i, type, dir, 415b4e3ac0aSLars-Peter Clausen IIO_SHARED_BY_TYPE, 416b4e3ac0aSLars-Peter Clausen &chan->event_spec[i].mask_shared_by_type); 417b4e3ac0aSLars-Peter Clausen if (ret < 0) 41892825ff9SHartmut Knaack return ret; 419b4e3ac0aSLars-Peter Clausen attrcount += ret; 420b4e3ac0aSLars-Peter Clausen 421b4e3ac0aSLars-Peter Clausen ret = iio_device_add_event(indio_dev, chan, i, type, dir, 422b4e3ac0aSLars-Peter Clausen IIO_SHARED_BY_DIR, 423b4e3ac0aSLars-Peter Clausen &chan->event_spec[i].mask_shared_by_dir); 424b4e3ac0aSLars-Peter Clausen if (ret < 0) 42592825ff9SHartmut Knaack return ret; 426b4e3ac0aSLars-Peter Clausen attrcount += ret; 427b4e3ac0aSLars-Peter Clausen 428b4e3ac0aSLars-Peter Clausen ret = iio_device_add_event(indio_dev, chan, i, type, dir, 429b4e3ac0aSLars-Peter Clausen IIO_SHARED_BY_ALL, 430b4e3ac0aSLars-Peter Clausen &chan->event_spec[i].mask_shared_by_all); 431b4e3ac0aSLars-Peter Clausen if (ret < 0) 43292825ff9SHartmut Knaack return ret; 433b4e3ac0aSLars-Peter Clausen attrcount += ret; 434b4e3ac0aSLars-Peter Clausen } 435b4e3ac0aSLars-Peter Clausen ret = attrcount; 436b4e3ac0aSLars-Peter Clausen return ret; 437b4e3ac0aSLars-Peter Clausen } 438b4e3ac0aSLars-Peter Clausen 439a980e046SJonathan Cameron static inline int __iio_add_event_config_attrs(struct iio_dev *indio_dev) 440a980e046SJonathan Cameron { 441a980e046SJonathan Cameron int j, ret, attrcount = 0; 442a980e046SJonathan Cameron 4432179aabeSRoberta Dobrescu /* Dynamically created from the channels array */ 444a980e046SJonathan Cameron for (j = 0; j < indio_dev->num_channels; j++) { 445a980e046SJonathan Cameron ret = iio_device_add_event_sysfs(indio_dev, 446a980e046SJonathan Cameron &indio_dev->channels[j]); 447a980e046SJonathan Cameron if (ret < 0) 448e3db9ef6SJulia Lawall return ret; 449a980e046SJonathan Cameron attrcount += ret; 450a980e046SJonathan Cameron } 451a980e046SJonathan Cameron return attrcount; 452a980e046SJonathan Cameron } 453a980e046SJonathan Cameron 454a980e046SJonathan Cameron static bool iio_check_for_dynamic_events(struct iio_dev *indio_dev) 455a980e046SJonathan Cameron { 456a980e046SJonathan Cameron int j; 457a980e046SJonathan Cameron 458b4e3ac0aSLars-Peter Clausen for (j = 0; j < indio_dev->num_channels; j++) { 459b4e3ac0aSLars-Peter Clausen if (indio_dev->channels[j].num_event_specs != 0) 460b4e3ac0aSLars-Peter Clausen return true; 461b4e3ac0aSLars-Peter Clausen } 462a980e046SJonathan Cameron return false; 463a980e046SJonathan Cameron } 464a980e046SJonathan Cameron 465a980e046SJonathan Cameron static void iio_setup_ev_int(struct iio_event_interface *ev_int) 466a980e046SJonathan Cameron { 467a980e046SJonathan Cameron INIT_KFIFO(ev_int->det_events); 468a980e046SJonathan Cameron init_waitqueue_head(&ev_int->wait); 469b91accafSLars-Peter Clausen mutex_init(&ev_int->read_lock); 470a980e046SJonathan Cameron } 471a980e046SJonathan Cameron 472a980e046SJonathan Cameron static const char *iio_event_group_name = "events"; 473a980e046SJonathan Cameron int iio_device_register_eventset(struct iio_dev *indio_dev) 474a980e046SJonathan Cameron { 475a980e046SJonathan Cameron struct iio_dev_attr *p; 476a980e046SJonathan Cameron int ret = 0, attrcount_orig = 0, attrcount, attrn; 477a980e046SJonathan Cameron struct attribute **attr; 478a980e046SJonathan Cameron 479a980e046SJonathan Cameron if (!(indio_dev->info->event_attrs || 480a980e046SJonathan Cameron iio_check_for_dynamic_events(indio_dev))) 481a980e046SJonathan Cameron return 0; 482a980e046SJonathan Cameron 483a980e046SJonathan Cameron indio_dev->event_interface = 484a980e046SJonathan Cameron kzalloc(sizeof(struct iio_event_interface), GFP_KERNEL); 48592825ff9SHartmut Knaack if (indio_dev->event_interface == NULL) 48692825ff9SHartmut Knaack return -ENOMEM; 487a980e046SJonathan Cameron 48846b24311SSascha Hauer INIT_LIST_HEAD(&indio_dev->event_interface->dev_attr_list); 48946b24311SSascha Hauer 490a980e046SJonathan Cameron iio_setup_ev_int(indio_dev->event_interface); 491a980e046SJonathan Cameron if (indio_dev->info->event_attrs != NULL) { 492a980e046SJonathan Cameron attr = indio_dev->info->event_attrs->attrs; 493a980e046SJonathan Cameron while (*attr++ != NULL) 494a980e046SJonathan Cameron attrcount_orig++; 495a980e046SJonathan Cameron } 496a980e046SJonathan Cameron attrcount = attrcount_orig; 497a980e046SJonathan Cameron if (indio_dev->channels) { 498a980e046SJonathan Cameron ret = __iio_add_event_config_attrs(indio_dev); 499a980e046SJonathan Cameron if (ret < 0) 500a980e046SJonathan Cameron goto error_free_setup_event_lines; 501a980e046SJonathan Cameron attrcount += ret; 502a980e046SJonathan Cameron } 503a980e046SJonathan Cameron 504a980e046SJonathan Cameron indio_dev->event_interface->group.name = iio_event_group_name; 505a980e046SJonathan Cameron indio_dev->event_interface->group.attrs = kcalloc(attrcount + 1, 506a980e046SJonathan Cameron sizeof(indio_dev->event_interface->group.attrs[0]), 507a980e046SJonathan Cameron GFP_KERNEL); 508a980e046SJonathan Cameron if (indio_dev->event_interface->group.attrs == NULL) { 509a980e046SJonathan Cameron ret = -ENOMEM; 510a980e046SJonathan Cameron goto error_free_setup_event_lines; 511a980e046SJonathan Cameron } 512a980e046SJonathan Cameron if (indio_dev->info->event_attrs) 513a980e046SJonathan Cameron memcpy(indio_dev->event_interface->group.attrs, 514a980e046SJonathan Cameron indio_dev->info->event_attrs->attrs, 515a980e046SJonathan Cameron sizeof(indio_dev->event_interface->group.attrs[0]) 516a980e046SJonathan Cameron *attrcount_orig); 517a980e046SJonathan Cameron attrn = attrcount_orig; 518a980e046SJonathan Cameron /* Add all elements from the list. */ 519a980e046SJonathan Cameron list_for_each_entry(p, 520a980e046SJonathan Cameron &indio_dev->event_interface->dev_attr_list, 521a980e046SJonathan Cameron l) 522a980e046SJonathan Cameron indio_dev->event_interface->group.attrs[attrn++] = 523a980e046SJonathan Cameron &p->dev_attr.attr; 524a980e046SJonathan Cameron indio_dev->groups[indio_dev->groupcounter++] = 525a980e046SJonathan Cameron &indio_dev->event_interface->group; 526a980e046SJonathan Cameron 527a980e046SJonathan Cameron return 0; 528a980e046SJonathan Cameron 529a980e046SJonathan Cameron error_free_setup_event_lines: 53084088ebdSLars-Peter Clausen iio_free_chan_devattr_list(&indio_dev->event_interface->dev_attr_list); 531a980e046SJonathan Cameron kfree(indio_dev->event_interface); 532c1b03ab5SMartin Fuzzey indio_dev->event_interface = NULL; 533a980e046SJonathan Cameron return ret; 534a980e046SJonathan Cameron } 535a980e046SJonathan Cameron 536d2f0a48fSLars-Peter Clausen /** 537d2f0a48fSLars-Peter Clausen * iio_device_wakeup_eventset - Wakes up the event waitqueue 538d2f0a48fSLars-Peter Clausen * @indio_dev: The IIO device 539d2f0a48fSLars-Peter Clausen * 540d2f0a48fSLars-Peter Clausen * Wakes up the event waitqueue used for poll() and blocking read(). 541d2f0a48fSLars-Peter Clausen * Should usually be called when the device is unregistered. 542d2f0a48fSLars-Peter Clausen */ 543d2f0a48fSLars-Peter Clausen void iio_device_wakeup_eventset(struct iio_dev *indio_dev) 544d2f0a48fSLars-Peter Clausen { 545d2f0a48fSLars-Peter Clausen if (indio_dev->event_interface == NULL) 546d2f0a48fSLars-Peter Clausen return; 547d2f0a48fSLars-Peter Clausen wake_up(&indio_dev->event_interface->wait); 548d2f0a48fSLars-Peter Clausen } 549d2f0a48fSLars-Peter Clausen 550a980e046SJonathan Cameron void iio_device_unregister_eventset(struct iio_dev *indio_dev) 551a980e046SJonathan Cameron { 552a980e046SJonathan Cameron if (indio_dev->event_interface == NULL) 553a980e046SJonathan Cameron return; 55484088ebdSLars-Peter Clausen iio_free_chan_devattr_list(&indio_dev->event_interface->dev_attr_list); 555a980e046SJonathan Cameron kfree(indio_dev->event_interface->group.attrs); 556a980e046SJonathan Cameron kfree(indio_dev->event_interface); 557a980e046SJonathan Cameron } 558