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 47a7e57dceSSachin Kamat /** 48a7e57dceSSachin Kamat * iio_push_event() - try to add event to the list for userspace reading 49a7e57dceSSachin Kamat * @indio_dev: IIO device structure 50a7e57dceSSachin Kamat * @ev_code: What event 51a7e57dceSSachin Kamat * @timestamp: When the event occurred 52b91accafSLars-Peter Clausen * 53b91accafSLars-Peter Clausen * Note: The caller must make sure that this function is not running 54b91accafSLars-Peter Clausen * concurrently for the same indio_dev more than once. 55a7e57dceSSachin Kamat **/ 56a980e046SJonathan Cameron int iio_push_event(struct iio_dev *indio_dev, u64 ev_code, s64 timestamp) 57a980e046SJonathan Cameron { 58a980e046SJonathan Cameron struct iio_event_interface *ev_int = indio_dev->event_interface; 59a980e046SJonathan Cameron struct iio_event_data ev; 60a980e046SJonathan Cameron int copied; 61a980e046SJonathan Cameron 62a980e046SJonathan Cameron /* Does anyone care? */ 63a980e046SJonathan Cameron if (test_bit(IIO_BUSY_BIT_POS, &ev_int->flags)) { 64a980e046SJonathan Cameron 65a980e046SJonathan Cameron ev.id = ev_code; 66a980e046SJonathan Cameron ev.timestamp = timestamp; 67a980e046SJonathan Cameron 68498d319bSStefani Seibold copied = kfifo_put(&ev_int->det_events, ev); 69a980e046SJonathan Cameron if (copied != 0) 70b91accafSLars-Peter Clausen wake_up_poll(&ev_int->wait, POLLIN); 71a980e046SJonathan Cameron } 72a980e046SJonathan Cameron 73a980e046SJonathan Cameron return 0; 74a980e046SJonathan Cameron } 75a980e046SJonathan Cameron EXPORT_SYMBOL(iio_push_event); 76a980e046SJonathan Cameron 77a980e046SJonathan Cameron /** 78a980e046SJonathan Cameron * iio_event_poll() - poll the event queue to find out if it has data 79a316c01dSCristina Opriceana * @filep: File structure pointer to identify the device 80a316c01dSCristina Opriceana * @wait: Poll table pointer to add the wait queue on 81a316c01dSCristina Opriceana * 82a316c01dSCristina Opriceana * Return: (POLLIN | POLLRDNORM) if data is available for reading 83a316c01dSCristina Opriceana * or a negative error code on failure 84a980e046SJonathan Cameron */ 85a980e046SJonathan Cameron static unsigned int iio_event_poll(struct file *filep, 86a980e046SJonathan Cameron struct poll_table_struct *wait) 87a980e046SJonathan Cameron { 88cadc2125SLars-Peter Clausen struct iio_dev *indio_dev = filep->private_data; 89cadc2125SLars-Peter Clausen struct iio_event_interface *ev_int = indio_dev->event_interface; 90a980e046SJonathan Cameron unsigned int events = 0; 91a980e046SJonathan Cameron 92f18e7a06SLars-Peter Clausen if (!indio_dev->info) 93*41d903c0SCristina Opriceana return events; 94f18e7a06SLars-Peter Clausen 95a980e046SJonathan Cameron poll_wait(filep, &ev_int->wait, wait); 96a980e046SJonathan Cameron 97a980e046SJonathan Cameron if (!kfifo_is_empty(&ev_int->det_events)) 98a980e046SJonathan Cameron events = POLLIN | POLLRDNORM; 99a980e046SJonathan Cameron 100a980e046SJonathan Cameron return events; 101a980e046SJonathan Cameron } 102a980e046SJonathan Cameron 103a980e046SJonathan Cameron static ssize_t iio_event_chrdev_read(struct file *filep, 104a980e046SJonathan Cameron char __user *buf, 105a980e046SJonathan Cameron size_t count, 106a980e046SJonathan Cameron loff_t *f_ps) 107a980e046SJonathan Cameron { 108cadc2125SLars-Peter Clausen struct iio_dev *indio_dev = filep->private_data; 109cadc2125SLars-Peter Clausen struct iio_event_interface *ev_int = indio_dev->event_interface; 110a980e046SJonathan Cameron unsigned int copied; 111a980e046SJonathan Cameron int ret; 112a980e046SJonathan Cameron 113f18e7a06SLars-Peter Clausen if (!indio_dev->info) 114f18e7a06SLars-Peter Clausen return -ENODEV; 115f18e7a06SLars-Peter Clausen 116a980e046SJonathan Cameron if (count < sizeof(struct iio_event_data)) 117a980e046SJonathan Cameron return -EINVAL; 118a980e046SJonathan Cameron 119b91accafSLars-Peter Clausen do { 120a980e046SJonathan Cameron if (kfifo_is_empty(&ev_int->det_events)) { 121b91accafSLars-Peter Clausen if (filep->f_flags & O_NONBLOCK) 122b91accafSLars-Peter Clausen return -EAGAIN; 123b91accafSLars-Peter Clausen 124b91accafSLars-Peter Clausen ret = wait_event_interruptible(ev_int->wait, 125d2f0a48fSLars-Peter Clausen !kfifo_is_empty(&ev_int->det_events) || 126d2f0a48fSLars-Peter Clausen indio_dev->info == NULL); 127a980e046SJonathan Cameron if (ret) 128b91accafSLars-Peter Clausen return ret; 129b91accafSLars-Peter Clausen if (indio_dev->info == NULL) 130b91accafSLars-Peter Clausen return -ENODEV; 131a980e046SJonathan Cameron } 132a980e046SJonathan Cameron 133b91accafSLars-Peter Clausen if (mutex_lock_interruptible(&ev_int->read_lock)) 134b91accafSLars-Peter Clausen return -ERESTARTSYS; 135a980e046SJonathan Cameron ret = kfifo_to_user(&ev_int->det_events, buf, count, &copied); 136b91accafSLars-Peter Clausen mutex_unlock(&ev_int->read_lock); 137a980e046SJonathan Cameron 138b91accafSLars-Peter Clausen if (ret) 139b91accafSLars-Peter Clausen return ret; 140a980e046SJonathan Cameron 141b91accafSLars-Peter Clausen /* 142b91accafSLars-Peter Clausen * If we couldn't read anything from the fifo (a different 143b91accafSLars-Peter Clausen * thread might have been faster) we either return -EAGAIN if 144b91accafSLars-Peter Clausen * the file descriptor is non-blocking, otherwise we go back to 145b91accafSLars-Peter Clausen * sleep and wait for more data to arrive. 146b91accafSLars-Peter Clausen */ 147b91accafSLars-Peter Clausen if (copied == 0 && (filep->f_flags & O_NONBLOCK)) 148b91accafSLars-Peter Clausen return -EAGAIN; 149b91accafSLars-Peter Clausen 150b91accafSLars-Peter Clausen } while (copied == 0); 151b91accafSLars-Peter Clausen 152b91accafSLars-Peter Clausen return copied; 153a980e046SJonathan Cameron } 154a980e046SJonathan Cameron 155a980e046SJonathan Cameron static int iio_event_chrdev_release(struct inode *inode, struct file *filep) 156a980e046SJonathan Cameron { 157cadc2125SLars-Peter Clausen struct iio_dev *indio_dev = filep->private_data; 158cadc2125SLars-Peter Clausen struct iio_event_interface *ev_int = indio_dev->event_interface; 159a980e046SJonathan Cameron 160b91accafSLars-Peter Clausen clear_bit(IIO_BUSY_BIT_POS, &ev_int->flags); 161a980e046SJonathan Cameron 162cadc2125SLars-Peter Clausen iio_device_put(indio_dev); 163cadc2125SLars-Peter Clausen 164a980e046SJonathan Cameron return 0; 165a980e046SJonathan Cameron } 166a980e046SJonathan Cameron 167a980e046SJonathan Cameron static const struct file_operations iio_event_chrdev_fileops = { 168a980e046SJonathan Cameron .read = iio_event_chrdev_read, 169a980e046SJonathan Cameron .poll = iio_event_poll, 170a980e046SJonathan Cameron .release = iio_event_chrdev_release, 171a980e046SJonathan Cameron .owner = THIS_MODULE, 172a980e046SJonathan Cameron .llseek = noop_llseek, 173a980e046SJonathan Cameron }; 174a980e046SJonathan Cameron 175a980e046SJonathan Cameron int iio_event_getfd(struct iio_dev *indio_dev) 176a980e046SJonathan Cameron { 177a980e046SJonathan Cameron struct iio_event_interface *ev_int = indio_dev->event_interface; 178a980e046SJonathan Cameron int fd; 179a980e046SJonathan Cameron 180a980e046SJonathan Cameron if (ev_int == NULL) 181a980e046SJonathan Cameron return -ENODEV; 182a980e046SJonathan Cameron 183b91accafSLars-Peter Clausen if (test_and_set_bit(IIO_BUSY_BIT_POS, &ev_int->flags)) 184a980e046SJonathan Cameron return -EBUSY; 185b91accafSLars-Peter Clausen 186cadc2125SLars-Peter Clausen iio_device_get(indio_dev); 187cadc2125SLars-Peter Clausen 188cadc2125SLars-Peter Clausen fd = anon_inode_getfd("iio:event", &iio_event_chrdev_fileops, 189e2aad1d5SGreg Kroah-Hartman indio_dev, O_RDONLY | O_CLOEXEC); 190a980e046SJonathan Cameron if (fd < 0) { 191b91accafSLars-Peter Clausen clear_bit(IIO_BUSY_BIT_POS, &ev_int->flags); 192cadc2125SLars-Peter Clausen iio_device_put(indio_dev); 193b91accafSLars-Peter Clausen } else { 194b91accafSLars-Peter Clausen kfifo_reset_out(&ev_int->det_events); 195a980e046SJonathan Cameron } 196b91accafSLars-Peter Clausen 197a980e046SJonathan Cameron return fd; 198a980e046SJonathan Cameron } 199a980e046SJonathan Cameron 200a980e046SJonathan Cameron static const char * const iio_ev_type_text[] = { 201a980e046SJonathan Cameron [IIO_EV_TYPE_THRESH] = "thresh", 202a980e046SJonathan Cameron [IIO_EV_TYPE_MAG] = "mag", 203a980e046SJonathan Cameron [IIO_EV_TYPE_ROC] = "roc", 204a980e046SJonathan Cameron [IIO_EV_TYPE_THRESH_ADAPTIVE] = "thresh_adaptive", 205a980e046SJonathan Cameron [IIO_EV_TYPE_MAG_ADAPTIVE] = "mag_adaptive", 20627be8423SIrina Tirdea [IIO_EV_TYPE_CHANGE] = "change", 207a980e046SJonathan Cameron }; 208a980e046SJonathan Cameron 209a980e046SJonathan Cameron static const char * const iio_ev_dir_text[] = { 210a980e046SJonathan Cameron [IIO_EV_DIR_EITHER] = "either", 211a980e046SJonathan Cameron [IIO_EV_DIR_RISING] = "rising", 212a980e046SJonathan Cameron [IIO_EV_DIR_FALLING] = "falling" 213a980e046SJonathan Cameron }; 214a980e046SJonathan Cameron 215b4e3ac0aSLars-Peter Clausen static const char * const iio_ev_info_text[] = { 216b4e3ac0aSLars-Peter Clausen [IIO_EV_INFO_ENABLE] = "en", 217b4e3ac0aSLars-Peter Clausen [IIO_EV_INFO_VALUE] = "value", 218ec6670aeSLars-Peter Clausen [IIO_EV_INFO_HYSTERESIS] = "hysteresis", 21977a533c7SSrinivas Pandruvada [IIO_EV_INFO_PERIOD] = "period", 2203f7f642bSMartin Fuzzey [IIO_EV_INFO_HIGH_PASS_FILTER_3DB] = "high_pass_filter_3db", 2213f7f642bSMartin Fuzzey [IIO_EV_INFO_LOW_PASS_FILTER_3DB] = "low_pass_filter_3db", 222b4e3ac0aSLars-Peter Clausen }; 223b4e3ac0aSLars-Peter Clausen 224b4e3ac0aSLars-Peter Clausen static enum iio_event_direction iio_ev_attr_dir(struct iio_dev_attr *attr) 225b4e3ac0aSLars-Peter Clausen { 226b4e3ac0aSLars-Peter Clausen return attr->c->event_spec[attr->address & 0xffff].dir; 227b4e3ac0aSLars-Peter Clausen } 228b4e3ac0aSLars-Peter Clausen 229b4e3ac0aSLars-Peter Clausen static enum iio_event_type iio_ev_attr_type(struct iio_dev_attr *attr) 230b4e3ac0aSLars-Peter Clausen { 231b4e3ac0aSLars-Peter Clausen return attr->c->event_spec[attr->address & 0xffff].type; 232b4e3ac0aSLars-Peter Clausen } 233b4e3ac0aSLars-Peter Clausen 234b4e3ac0aSLars-Peter Clausen static enum iio_event_info iio_ev_attr_info(struct iio_dev_attr *attr) 235b4e3ac0aSLars-Peter Clausen { 236b4e3ac0aSLars-Peter Clausen return (attr->address >> 16) & 0xffff; 237b4e3ac0aSLars-Peter Clausen } 238b4e3ac0aSLars-Peter Clausen 239a980e046SJonathan Cameron static ssize_t iio_ev_state_store(struct device *dev, 240a980e046SJonathan Cameron struct device_attribute *attr, 241a980e046SJonathan Cameron const char *buf, 242a980e046SJonathan Cameron size_t len) 243a980e046SJonathan Cameron { 244e53f5ac5SLars-Peter Clausen struct iio_dev *indio_dev = dev_to_iio_dev(dev); 245a980e046SJonathan Cameron struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); 246a980e046SJonathan Cameron int ret; 247a980e046SJonathan Cameron bool val; 248a980e046SJonathan Cameron 249a980e046SJonathan Cameron ret = strtobool(buf, &val); 250a980e046SJonathan Cameron if (ret < 0) 251a980e046SJonathan Cameron return ret; 252a980e046SJonathan Cameron 253a980e046SJonathan Cameron ret = indio_dev->info->write_event_config(indio_dev, 254b4e3ac0aSLars-Peter Clausen this_attr->c, iio_ev_attr_type(this_attr), 255b4e3ac0aSLars-Peter Clausen iio_ev_attr_dir(this_attr), val); 256b4e3ac0aSLars-Peter Clausen 257a980e046SJonathan Cameron return (ret < 0) ? ret : len; 258a980e046SJonathan Cameron } 259a980e046SJonathan Cameron 260a980e046SJonathan Cameron static ssize_t iio_ev_state_show(struct device *dev, 261a980e046SJonathan Cameron struct device_attribute *attr, 262a980e046SJonathan Cameron char *buf) 263a980e046SJonathan Cameron { 264e53f5ac5SLars-Peter Clausen struct iio_dev *indio_dev = dev_to_iio_dev(dev); 265a980e046SJonathan Cameron struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); 266b4e3ac0aSLars-Peter Clausen int val; 267a980e046SJonathan Cameron 268b4e3ac0aSLars-Peter Clausen val = indio_dev->info->read_event_config(indio_dev, 269b4e3ac0aSLars-Peter Clausen this_attr->c, iio_ev_attr_type(this_attr), 270b4e3ac0aSLars-Peter Clausen iio_ev_attr_dir(this_attr)); 271a980e046SJonathan Cameron if (val < 0) 272a980e046SJonathan Cameron return val; 273a980e046SJonathan Cameron else 274a980e046SJonathan Cameron return sprintf(buf, "%d\n", val); 275a980e046SJonathan Cameron } 276a980e046SJonathan Cameron 277a980e046SJonathan Cameron static ssize_t iio_ev_value_show(struct device *dev, 278a980e046SJonathan Cameron struct device_attribute *attr, 279a980e046SJonathan Cameron char *buf) 280a980e046SJonathan Cameron { 281e53f5ac5SLars-Peter Clausen struct iio_dev *indio_dev = dev_to_iio_dev(dev); 282a980e046SJonathan Cameron struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); 2839fbfb4b3SSrinivas Pandruvada int val, val2, val_arr[2]; 284b4e3ac0aSLars-Peter Clausen int ret; 285a980e046SJonathan Cameron 286a980e046SJonathan Cameron ret = indio_dev->info->read_event_value(indio_dev, 287b4e3ac0aSLars-Peter Clausen this_attr->c, iio_ev_attr_type(this_attr), 288b4e3ac0aSLars-Peter Clausen iio_ev_attr_dir(this_attr), iio_ev_attr_info(this_attr), 289b4e3ac0aSLars-Peter Clausen &val, &val2); 290b4e3ac0aSLars-Peter Clausen if (ret < 0) 291b4e3ac0aSLars-Peter Clausen return ret; 2929fbfb4b3SSrinivas Pandruvada val_arr[0] = val; 2939fbfb4b3SSrinivas Pandruvada val_arr[1] = val2; 2949fbfb4b3SSrinivas Pandruvada return iio_format_value(buf, ret, 2, val_arr); 295b4e3ac0aSLars-Peter Clausen } 296a980e046SJonathan Cameron 297a980e046SJonathan Cameron static ssize_t iio_ev_value_store(struct device *dev, 298a980e046SJonathan Cameron struct device_attribute *attr, 299a980e046SJonathan Cameron const char *buf, 300a980e046SJonathan Cameron size_t len) 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); 304b4e3ac0aSLars-Peter Clausen int val, val2; 305a980e046SJonathan Cameron int ret; 306a980e046SJonathan Cameron 307cb955852SLars-Peter Clausen if (!indio_dev->info->write_event_value) 308a980e046SJonathan Cameron return -EINVAL; 309a980e046SJonathan Cameron 310b4e3ac0aSLars-Peter Clausen ret = iio_str_to_fixpoint(buf, 100000, &val, &val2); 311b4e3ac0aSLars-Peter Clausen if (ret) 312b4e3ac0aSLars-Peter Clausen return ret; 313cb955852SLars-Peter Clausen ret = indio_dev->info->write_event_value(indio_dev, 314b4e3ac0aSLars-Peter Clausen this_attr->c, iio_ev_attr_type(this_attr), 315b4e3ac0aSLars-Peter Clausen iio_ev_attr_dir(this_attr), iio_ev_attr_info(this_attr), 316b4e3ac0aSLars-Peter Clausen val, val2); 317a980e046SJonathan Cameron if (ret < 0) 318a980e046SJonathan Cameron return ret; 319a980e046SJonathan Cameron 320a980e046SJonathan Cameron return len; 321a980e046SJonathan Cameron } 322a980e046SJonathan Cameron 323b4e3ac0aSLars-Peter Clausen static int iio_device_add_event(struct iio_dev *indio_dev, 324b4e3ac0aSLars-Peter Clausen const struct iio_chan_spec *chan, unsigned int spec_index, 325b4e3ac0aSLars-Peter Clausen enum iio_event_type type, enum iio_event_direction dir, 326b4e3ac0aSLars-Peter Clausen enum iio_shared_by shared_by, const unsigned long *mask) 327b4e3ac0aSLars-Peter Clausen { 328b4e3ac0aSLars-Peter Clausen ssize_t (*show)(struct device *, struct device_attribute *, char *); 329b4e3ac0aSLars-Peter Clausen ssize_t (*store)(struct device *, struct device_attribute *, 330b4e3ac0aSLars-Peter Clausen const char *, size_t); 331b4e3ac0aSLars-Peter Clausen unsigned int attrcount = 0; 332b4e3ac0aSLars-Peter Clausen unsigned int i; 333b4e3ac0aSLars-Peter Clausen char *postfix; 334b4e3ac0aSLars-Peter Clausen int ret; 335b4e3ac0aSLars-Peter Clausen 336ef4b4856SJonathan Cameron for_each_set_bit(i, mask, sizeof(*mask)*8) { 337ef4b4856SJonathan Cameron if (i >= ARRAY_SIZE(iio_ev_info_text)) 338ef4b4856SJonathan Cameron return -EINVAL; 3391843c2f3SIrina Tirdea if (dir != IIO_EV_DIR_NONE) 340b4e3ac0aSLars-Peter Clausen postfix = kasprintf(GFP_KERNEL, "%s_%s_%s", 3411843c2f3SIrina Tirdea iio_ev_type_text[type], 3421843c2f3SIrina Tirdea iio_ev_dir_text[dir], 3431843c2f3SIrina Tirdea iio_ev_info_text[i]); 3441843c2f3SIrina Tirdea else 3451843c2f3SIrina Tirdea postfix = kasprintf(GFP_KERNEL, "%s_%s", 3461843c2f3SIrina Tirdea iio_ev_type_text[type], 347b4e3ac0aSLars-Peter Clausen iio_ev_info_text[i]); 348b4e3ac0aSLars-Peter Clausen if (postfix == NULL) 349b4e3ac0aSLars-Peter Clausen return -ENOMEM; 350b4e3ac0aSLars-Peter Clausen 351b4e3ac0aSLars-Peter Clausen if (i == IIO_EV_INFO_ENABLE) { 352b4e3ac0aSLars-Peter Clausen show = iio_ev_state_show; 353b4e3ac0aSLars-Peter Clausen store = iio_ev_state_store; 354b4e3ac0aSLars-Peter Clausen } else { 355b4e3ac0aSLars-Peter Clausen show = iio_ev_value_show; 356b4e3ac0aSLars-Peter Clausen store = iio_ev_value_store; 357b4e3ac0aSLars-Peter Clausen } 358b4e3ac0aSLars-Peter Clausen 359b4e3ac0aSLars-Peter Clausen ret = __iio_add_chan_devattr(postfix, chan, show, store, 360b4e3ac0aSLars-Peter Clausen (i << 16) | spec_index, shared_by, &indio_dev->dev, 361b4e3ac0aSLars-Peter Clausen &indio_dev->event_interface->dev_attr_list); 362b4e3ac0aSLars-Peter Clausen kfree(postfix); 363b4e3ac0aSLars-Peter Clausen 36478b33216SSrinivas Pandruvada if ((ret == -EBUSY) && (shared_by != IIO_SEPARATE)) 36578b33216SSrinivas Pandruvada continue; 36678b33216SSrinivas Pandruvada 367b4e3ac0aSLars-Peter Clausen if (ret) 368b4e3ac0aSLars-Peter Clausen return ret; 369b4e3ac0aSLars-Peter Clausen 370b4e3ac0aSLars-Peter Clausen attrcount++; 371b4e3ac0aSLars-Peter Clausen } 372b4e3ac0aSLars-Peter Clausen 373b4e3ac0aSLars-Peter Clausen return attrcount; 374b4e3ac0aSLars-Peter Clausen } 375b4e3ac0aSLars-Peter Clausen 376cb955852SLars-Peter Clausen static int iio_device_add_event_sysfs(struct iio_dev *indio_dev, 377b4e3ac0aSLars-Peter Clausen struct iio_chan_spec const *chan) 378b4e3ac0aSLars-Peter Clausen { 379b4e3ac0aSLars-Peter Clausen int ret = 0, i, attrcount = 0; 380b4e3ac0aSLars-Peter Clausen enum iio_event_direction dir; 381b4e3ac0aSLars-Peter Clausen enum iio_event_type type; 382b4e3ac0aSLars-Peter Clausen 383b4e3ac0aSLars-Peter Clausen for (i = 0; i < chan->num_event_specs; i++) { 384b4e3ac0aSLars-Peter Clausen type = chan->event_spec[i].type; 385b4e3ac0aSLars-Peter Clausen dir = chan->event_spec[i].dir; 386b4e3ac0aSLars-Peter Clausen 387b4e3ac0aSLars-Peter Clausen ret = iio_device_add_event(indio_dev, chan, i, type, dir, 388b4e3ac0aSLars-Peter Clausen IIO_SEPARATE, &chan->event_spec[i].mask_separate); 389b4e3ac0aSLars-Peter Clausen if (ret < 0) 39092825ff9SHartmut Knaack return ret; 391b4e3ac0aSLars-Peter Clausen attrcount += ret; 392b4e3ac0aSLars-Peter Clausen 393b4e3ac0aSLars-Peter Clausen ret = iio_device_add_event(indio_dev, chan, i, type, dir, 394b4e3ac0aSLars-Peter Clausen IIO_SHARED_BY_TYPE, 395b4e3ac0aSLars-Peter Clausen &chan->event_spec[i].mask_shared_by_type); 396b4e3ac0aSLars-Peter Clausen if (ret < 0) 39792825ff9SHartmut Knaack return ret; 398b4e3ac0aSLars-Peter Clausen attrcount += ret; 399b4e3ac0aSLars-Peter Clausen 400b4e3ac0aSLars-Peter Clausen ret = iio_device_add_event(indio_dev, chan, i, type, dir, 401b4e3ac0aSLars-Peter Clausen IIO_SHARED_BY_DIR, 402b4e3ac0aSLars-Peter Clausen &chan->event_spec[i].mask_shared_by_dir); 403b4e3ac0aSLars-Peter Clausen if (ret < 0) 40492825ff9SHartmut Knaack return ret; 405b4e3ac0aSLars-Peter Clausen attrcount += ret; 406b4e3ac0aSLars-Peter Clausen 407b4e3ac0aSLars-Peter Clausen ret = iio_device_add_event(indio_dev, chan, i, type, dir, 408b4e3ac0aSLars-Peter Clausen IIO_SHARED_BY_ALL, 409b4e3ac0aSLars-Peter Clausen &chan->event_spec[i].mask_shared_by_all); 410b4e3ac0aSLars-Peter Clausen if (ret < 0) 41192825ff9SHartmut Knaack return ret; 412b4e3ac0aSLars-Peter Clausen attrcount += ret; 413b4e3ac0aSLars-Peter Clausen } 414b4e3ac0aSLars-Peter Clausen ret = attrcount; 415b4e3ac0aSLars-Peter Clausen return ret; 416b4e3ac0aSLars-Peter Clausen } 417b4e3ac0aSLars-Peter Clausen 418a980e046SJonathan Cameron static inline int __iio_add_event_config_attrs(struct iio_dev *indio_dev) 419a980e046SJonathan Cameron { 420a980e046SJonathan Cameron int j, ret, attrcount = 0; 421a980e046SJonathan Cameron 4222179aabeSRoberta Dobrescu /* Dynamically created from the channels array */ 423a980e046SJonathan Cameron for (j = 0; j < indio_dev->num_channels; j++) { 424a980e046SJonathan Cameron ret = iio_device_add_event_sysfs(indio_dev, 425a980e046SJonathan Cameron &indio_dev->channels[j]); 426a980e046SJonathan Cameron if (ret < 0) 427e3db9ef6SJulia Lawall return ret; 428a980e046SJonathan Cameron attrcount += ret; 429a980e046SJonathan Cameron } 430a980e046SJonathan Cameron return attrcount; 431a980e046SJonathan Cameron } 432a980e046SJonathan Cameron 433a980e046SJonathan Cameron static bool iio_check_for_dynamic_events(struct iio_dev *indio_dev) 434a980e046SJonathan Cameron { 435a980e046SJonathan Cameron int j; 436a980e046SJonathan Cameron 437b4e3ac0aSLars-Peter Clausen for (j = 0; j < indio_dev->num_channels; j++) { 438b4e3ac0aSLars-Peter Clausen if (indio_dev->channels[j].num_event_specs != 0) 439b4e3ac0aSLars-Peter Clausen return true; 440b4e3ac0aSLars-Peter Clausen } 441a980e046SJonathan Cameron return false; 442a980e046SJonathan Cameron } 443a980e046SJonathan Cameron 444a980e046SJonathan Cameron static void iio_setup_ev_int(struct iio_event_interface *ev_int) 445a980e046SJonathan Cameron { 446a980e046SJonathan Cameron INIT_KFIFO(ev_int->det_events); 447a980e046SJonathan Cameron init_waitqueue_head(&ev_int->wait); 448b91accafSLars-Peter Clausen mutex_init(&ev_int->read_lock); 449a980e046SJonathan Cameron } 450a980e046SJonathan Cameron 451a980e046SJonathan Cameron static const char *iio_event_group_name = "events"; 452a980e046SJonathan Cameron int iio_device_register_eventset(struct iio_dev *indio_dev) 453a980e046SJonathan Cameron { 454a980e046SJonathan Cameron struct iio_dev_attr *p; 455a980e046SJonathan Cameron int ret = 0, attrcount_orig = 0, attrcount, attrn; 456a980e046SJonathan Cameron struct attribute **attr; 457a980e046SJonathan Cameron 458a980e046SJonathan Cameron if (!(indio_dev->info->event_attrs || 459a980e046SJonathan Cameron iio_check_for_dynamic_events(indio_dev))) 460a980e046SJonathan Cameron return 0; 461a980e046SJonathan Cameron 462a980e046SJonathan Cameron indio_dev->event_interface = 463a980e046SJonathan Cameron kzalloc(sizeof(struct iio_event_interface), GFP_KERNEL); 46492825ff9SHartmut Knaack if (indio_dev->event_interface == NULL) 46592825ff9SHartmut Knaack return -ENOMEM; 466a980e046SJonathan Cameron 46746b24311SSascha Hauer INIT_LIST_HEAD(&indio_dev->event_interface->dev_attr_list); 46846b24311SSascha Hauer 469a980e046SJonathan Cameron iio_setup_ev_int(indio_dev->event_interface); 470a980e046SJonathan Cameron if (indio_dev->info->event_attrs != NULL) { 471a980e046SJonathan Cameron attr = indio_dev->info->event_attrs->attrs; 472a980e046SJonathan Cameron while (*attr++ != NULL) 473a980e046SJonathan Cameron attrcount_orig++; 474a980e046SJonathan Cameron } 475a980e046SJonathan Cameron attrcount = attrcount_orig; 476a980e046SJonathan Cameron if (indio_dev->channels) { 477a980e046SJonathan Cameron ret = __iio_add_event_config_attrs(indio_dev); 478a980e046SJonathan Cameron if (ret < 0) 479a980e046SJonathan Cameron goto error_free_setup_event_lines; 480a980e046SJonathan Cameron attrcount += ret; 481a980e046SJonathan Cameron } 482a980e046SJonathan Cameron 483a980e046SJonathan Cameron indio_dev->event_interface->group.name = iio_event_group_name; 484a980e046SJonathan Cameron indio_dev->event_interface->group.attrs = kcalloc(attrcount + 1, 485a980e046SJonathan Cameron sizeof(indio_dev->event_interface->group.attrs[0]), 486a980e046SJonathan Cameron GFP_KERNEL); 487a980e046SJonathan Cameron if (indio_dev->event_interface->group.attrs == NULL) { 488a980e046SJonathan Cameron ret = -ENOMEM; 489a980e046SJonathan Cameron goto error_free_setup_event_lines; 490a980e046SJonathan Cameron } 491a980e046SJonathan Cameron if (indio_dev->info->event_attrs) 492a980e046SJonathan Cameron memcpy(indio_dev->event_interface->group.attrs, 493a980e046SJonathan Cameron indio_dev->info->event_attrs->attrs, 494a980e046SJonathan Cameron sizeof(indio_dev->event_interface->group.attrs[0]) 495a980e046SJonathan Cameron *attrcount_orig); 496a980e046SJonathan Cameron attrn = attrcount_orig; 497a980e046SJonathan Cameron /* Add all elements from the list. */ 498a980e046SJonathan Cameron list_for_each_entry(p, 499a980e046SJonathan Cameron &indio_dev->event_interface->dev_attr_list, 500a980e046SJonathan Cameron l) 501a980e046SJonathan Cameron indio_dev->event_interface->group.attrs[attrn++] = 502a980e046SJonathan Cameron &p->dev_attr.attr; 503a980e046SJonathan Cameron indio_dev->groups[indio_dev->groupcounter++] = 504a980e046SJonathan Cameron &indio_dev->event_interface->group; 505a980e046SJonathan Cameron 506a980e046SJonathan Cameron return 0; 507a980e046SJonathan Cameron 508a980e046SJonathan Cameron error_free_setup_event_lines: 50984088ebdSLars-Peter Clausen iio_free_chan_devattr_list(&indio_dev->event_interface->dev_attr_list); 510a980e046SJonathan Cameron kfree(indio_dev->event_interface); 511c1b03ab5SMartin Fuzzey indio_dev->event_interface = NULL; 512a980e046SJonathan Cameron return ret; 513a980e046SJonathan Cameron } 514a980e046SJonathan Cameron 515d2f0a48fSLars-Peter Clausen /** 516d2f0a48fSLars-Peter Clausen * iio_device_wakeup_eventset - Wakes up the event waitqueue 517d2f0a48fSLars-Peter Clausen * @indio_dev: The IIO device 518d2f0a48fSLars-Peter Clausen * 519d2f0a48fSLars-Peter Clausen * Wakes up the event waitqueue used for poll() and blocking read(). 520d2f0a48fSLars-Peter Clausen * Should usually be called when the device is unregistered. 521d2f0a48fSLars-Peter Clausen */ 522d2f0a48fSLars-Peter Clausen void iio_device_wakeup_eventset(struct iio_dev *indio_dev) 523d2f0a48fSLars-Peter Clausen { 524d2f0a48fSLars-Peter Clausen if (indio_dev->event_interface == NULL) 525d2f0a48fSLars-Peter Clausen return; 526d2f0a48fSLars-Peter Clausen wake_up(&indio_dev->event_interface->wait); 527d2f0a48fSLars-Peter Clausen } 528d2f0a48fSLars-Peter Clausen 529a980e046SJonathan Cameron void iio_device_unregister_eventset(struct iio_dev *indio_dev) 530a980e046SJonathan Cameron { 531a980e046SJonathan Cameron if (indio_dev->event_interface == NULL) 532a980e046SJonathan Cameron return; 53384088ebdSLars-Peter Clausen iio_free_chan_devattr_list(&indio_dev->event_interface->dev_attr_list); 534a980e046SJonathan Cameron kfree(indio_dev->event_interface->group.attrs); 535a980e046SJonathan Cameron kfree(indio_dev->event_interface); 536a980e046SJonathan Cameron } 537