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 35a980e046SJonathan Cameron */ 36a980e046SJonathan Cameron struct iio_event_interface { 37a980e046SJonathan Cameron wait_queue_head_t wait; 38a980e046SJonathan Cameron DECLARE_KFIFO(det_events, struct iio_event_data, 16); 39a980e046SJonathan Cameron 40a980e046SJonathan Cameron struct list_head dev_attr_list; 41a980e046SJonathan Cameron unsigned long flags; 42a980e046SJonathan Cameron struct attribute_group group; 43b91accafSLars-Peter Clausen struct mutex read_lock; 44a980e046SJonathan Cameron }; 45a980e046SJonathan Cameron 46a7e57dceSSachin Kamat /** 47a7e57dceSSachin Kamat * iio_push_event() - try to add event to the list for userspace reading 48a7e57dceSSachin Kamat * @indio_dev: IIO device structure 49a7e57dceSSachin Kamat * @ev_code: What event 50a7e57dceSSachin Kamat * @timestamp: When the event occurred 51b91accafSLars-Peter Clausen * 52b91accafSLars-Peter Clausen * Note: The caller must make sure that this function is not running 53b91accafSLars-Peter Clausen * concurrently for the same indio_dev more than once. 54a7e57dceSSachin Kamat **/ 55a980e046SJonathan Cameron int iio_push_event(struct iio_dev *indio_dev, u64 ev_code, s64 timestamp) 56a980e046SJonathan Cameron { 57a980e046SJonathan Cameron struct iio_event_interface *ev_int = indio_dev->event_interface; 58a980e046SJonathan Cameron struct iio_event_data ev; 59a980e046SJonathan Cameron int copied; 60a980e046SJonathan Cameron 61a980e046SJonathan Cameron /* Does anyone care? */ 62a980e046SJonathan Cameron if (test_bit(IIO_BUSY_BIT_POS, &ev_int->flags)) { 63a980e046SJonathan Cameron 64a980e046SJonathan Cameron ev.id = ev_code; 65a980e046SJonathan Cameron ev.timestamp = timestamp; 66a980e046SJonathan Cameron 67498d319bSStefani Seibold copied = kfifo_put(&ev_int->det_events, ev); 68a980e046SJonathan Cameron if (copied != 0) 69b91accafSLars-Peter Clausen wake_up_poll(&ev_int->wait, POLLIN); 70a980e046SJonathan Cameron } 71a980e046SJonathan Cameron 72a980e046SJonathan Cameron return 0; 73a980e046SJonathan Cameron } 74a980e046SJonathan Cameron EXPORT_SYMBOL(iio_push_event); 75a980e046SJonathan Cameron 76a980e046SJonathan Cameron /** 77a980e046SJonathan Cameron * iio_event_poll() - poll the event queue to find out if it has data 78a980e046SJonathan Cameron */ 79a980e046SJonathan Cameron static unsigned int iio_event_poll(struct file *filep, 80a980e046SJonathan Cameron struct poll_table_struct *wait) 81a980e046SJonathan Cameron { 82cadc2125SLars-Peter Clausen struct iio_dev *indio_dev = filep->private_data; 83cadc2125SLars-Peter Clausen struct iio_event_interface *ev_int = indio_dev->event_interface; 84a980e046SJonathan Cameron unsigned int events = 0; 85a980e046SJonathan Cameron 86f18e7a06SLars-Peter Clausen if (!indio_dev->info) 87f18e7a06SLars-Peter Clausen return -ENODEV; 88f18e7a06SLars-Peter Clausen 89a980e046SJonathan Cameron poll_wait(filep, &ev_int->wait, wait); 90a980e046SJonathan Cameron 91a980e046SJonathan Cameron if (!kfifo_is_empty(&ev_int->det_events)) 92a980e046SJonathan Cameron events = POLLIN | POLLRDNORM; 93a980e046SJonathan Cameron 94a980e046SJonathan Cameron return events; 95a980e046SJonathan Cameron } 96a980e046SJonathan Cameron 97a980e046SJonathan Cameron static ssize_t iio_event_chrdev_read(struct file *filep, 98a980e046SJonathan Cameron char __user *buf, 99a980e046SJonathan Cameron size_t count, 100a980e046SJonathan Cameron loff_t *f_ps) 101a980e046SJonathan Cameron { 102cadc2125SLars-Peter Clausen struct iio_dev *indio_dev = filep->private_data; 103cadc2125SLars-Peter Clausen struct iio_event_interface *ev_int = indio_dev->event_interface; 104a980e046SJonathan Cameron unsigned int copied; 105a980e046SJonathan Cameron int ret; 106a980e046SJonathan Cameron 107f18e7a06SLars-Peter Clausen if (!indio_dev->info) 108f18e7a06SLars-Peter Clausen return -ENODEV; 109f18e7a06SLars-Peter Clausen 110a980e046SJonathan Cameron if (count < sizeof(struct iio_event_data)) 111a980e046SJonathan Cameron return -EINVAL; 112a980e046SJonathan Cameron 113b91accafSLars-Peter Clausen do { 114a980e046SJonathan Cameron if (kfifo_is_empty(&ev_int->det_events)) { 115b91accafSLars-Peter Clausen if (filep->f_flags & O_NONBLOCK) 116b91accafSLars-Peter Clausen return -EAGAIN; 117b91accafSLars-Peter Clausen 118b91accafSLars-Peter Clausen ret = wait_event_interruptible(ev_int->wait, 119d2f0a48fSLars-Peter Clausen !kfifo_is_empty(&ev_int->det_events) || 120d2f0a48fSLars-Peter Clausen indio_dev->info == NULL); 121a980e046SJonathan Cameron if (ret) 122b91accafSLars-Peter Clausen return ret; 123b91accafSLars-Peter Clausen if (indio_dev->info == NULL) 124b91accafSLars-Peter Clausen return -ENODEV; 125a980e046SJonathan Cameron } 126a980e046SJonathan Cameron 127b91accafSLars-Peter Clausen if (mutex_lock_interruptible(&ev_int->read_lock)) 128b91accafSLars-Peter Clausen return -ERESTARTSYS; 129a980e046SJonathan Cameron ret = kfifo_to_user(&ev_int->det_events, buf, count, &copied); 130b91accafSLars-Peter Clausen mutex_unlock(&ev_int->read_lock); 131a980e046SJonathan Cameron 132b91accafSLars-Peter Clausen if (ret) 133b91accafSLars-Peter Clausen return ret; 134a980e046SJonathan Cameron 135b91accafSLars-Peter Clausen /* 136b91accafSLars-Peter Clausen * If we couldn't read anything from the fifo (a different 137b91accafSLars-Peter Clausen * thread might have been faster) we either return -EAGAIN if 138b91accafSLars-Peter Clausen * the file descriptor is non-blocking, otherwise we go back to 139b91accafSLars-Peter Clausen * sleep and wait for more data to arrive. 140b91accafSLars-Peter Clausen */ 141b91accafSLars-Peter Clausen if (copied == 0 && (filep->f_flags & O_NONBLOCK)) 142b91accafSLars-Peter Clausen return -EAGAIN; 143b91accafSLars-Peter Clausen 144b91accafSLars-Peter Clausen } while (copied == 0); 145b91accafSLars-Peter Clausen 146b91accafSLars-Peter Clausen return copied; 147a980e046SJonathan Cameron } 148a980e046SJonathan Cameron 149a980e046SJonathan Cameron static int iio_event_chrdev_release(struct inode *inode, struct file *filep) 150a980e046SJonathan Cameron { 151cadc2125SLars-Peter Clausen struct iio_dev *indio_dev = filep->private_data; 152cadc2125SLars-Peter Clausen struct iio_event_interface *ev_int = indio_dev->event_interface; 153a980e046SJonathan Cameron 154b91accafSLars-Peter Clausen clear_bit(IIO_BUSY_BIT_POS, &ev_int->flags); 155a980e046SJonathan Cameron 156cadc2125SLars-Peter Clausen iio_device_put(indio_dev); 157cadc2125SLars-Peter Clausen 158a980e046SJonathan Cameron return 0; 159a980e046SJonathan Cameron } 160a980e046SJonathan Cameron 161a980e046SJonathan Cameron static const struct file_operations iio_event_chrdev_fileops = { 162a980e046SJonathan Cameron .read = iio_event_chrdev_read, 163a980e046SJonathan Cameron .poll = iio_event_poll, 164a980e046SJonathan Cameron .release = iio_event_chrdev_release, 165a980e046SJonathan Cameron .owner = THIS_MODULE, 166a980e046SJonathan Cameron .llseek = noop_llseek, 167a980e046SJonathan Cameron }; 168a980e046SJonathan Cameron 169a980e046SJonathan Cameron int iio_event_getfd(struct iio_dev *indio_dev) 170a980e046SJonathan Cameron { 171a980e046SJonathan Cameron struct iio_event_interface *ev_int = indio_dev->event_interface; 172a980e046SJonathan Cameron int fd; 173a980e046SJonathan Cameron 174a980e046SJonathan Cameron if (ev_int == NULL) 175a980e046SJonathan Cameron return -ENODEV; 176a980e046SJonathan Cameron 177b91accafSLars-Peter Clausen if (test_and_set_bit(IIO_BUSY_BIT_POS, &ev_int->flags)) 178a980e046SJonathan Cameron return -EBUSY; 179b91accafSLars-Peter Clausen 180cadc2125SLars-Peter Clausen iio_device_get(indio_dev); 181cadc2125SLars-Peter Clausen 182cadc2125SLars-Peter Clausen fd = anon_inode_getfd("iio:event", &iio_event_chrdev_fileops, 183e2aad1d5SGreg Kroah-Hartman indio_dev, O_RDONLY | O_CLOEXEC); 184a980e046SJonathan Cameron if (fd < 0) { 185b91accafSLars-Peter Clausen clear_bit(IIO_BUSY_BIT_POS, &ev_int->flags); 186cadc2125SLars-Peter Clausen iio_device_put(indio_dev); 187b91accafSLars-Peter Clausen } else { 188b91accafSLars-Peter Clausen kfifo_reset_out(&ev_int->det_events); 189a980e046SJonathan Cameron } 190b91accafSLars-Peter Clausen 191a980e046SJonathan Cameron return fd; 192a980e046SJonathan Cameron } 193a980e046SJonathan Cameron 194a980e046SJonathan Cameron static const char * const iio_ev_type_text[] = { 195a980e046SJonathan Cameron [IIO_EV_TYPE_THRESH] = "thresh", 196a980e046SJonathan Cameron [IIO_EV_TYPE_MAG] = "mag", 197a980e046SJonathan Cameron [IIO_EV_TYPE_ROC] = "roc", 198a980e046SJonathan Cameron [IIO_EV_TYPE_THRESH_ADAPTIVE] = "thresh_adaptive", 199a980e046SJonathan Cameron [IIO_EV_TYPE_MAG_ADAPTIVE] = "mag_adaptive", 200a980e046SJonathan Cameron }; 201a980e046SJonathan Cameron 202a980e046SJonathan Cameron static const char * const iio_ev_dir_text[] = { 203a980e046SJonathan Cameron [IIO_EV_DIR_EITHER] = "either", 204a980e046SJonathan Cameron [IIO_EV_DIR_RISING] = "rising", 205a980e046SJonathan Cameron [IIO_EV_DIR_FALLING] = "falling" 206a980e046SJonathan Cameron }; 207a980e046SJonathan Cameron 208b4e3ac0aSLars-Peter Clausen static const char * const iio_ev_info_text[] = { 209b4e3ac0aSLars-Peter Clausen [IIO_EV_INFO_ENABLE] = "en", 210b4e3ac0aSLars-Peter Clausen [IIO_EV_INFO_VALUE] = "value", 211ec6670aeSLars-Peter Clausen [IIO_EV_INFO_HYSTERESIS] = "hysteresis", 212b4e3ac0aSLars-Peter Clausen }; 213b4e3ac0aSLars-Peter Clausen 214b4e3ac0aSLars-Peter Clausen static enum iio_event_direction iio_ev_attr_dir(struct iio_dev_attr *attr) 215b4e3ac0aSLars-Peter Clausen { 216b4e3ac0aSLars-Peter Clausen return attr->c->event_spec[attr->address & 0xffff].dir; 217b4e3ac0aSLars-Peter Clausen } 218b4e3ac0aSLars-Peter Clausen 219b4e3ac0aSLars-Peter Clausen static enum iio_event_type iio_ev_attr_type(struct iio_dev_attr *attr) 220b4e3ac0aSLars-Peter Clausen { 221b4e3ac0aSLars-Peter Clausen return attr->c->event_spec[attr->address & 0xffff].type; 222b4e3ac0aSLars-Peter Clausen } 223b4e3ac0aSLars-Peter Clausen 224b4e3ac0aSLars-Peter Clausen static enum iio_event_info iio_ev_attr_info(struct iio_dev_attr *attr) 225b4e3ac0aSLars-Peter Clausen { 226b4e3ac0aSLars-Peter Clausen return (attr->address >> 16) & 0xffff; 227b4e3ac0aSLars-Peter Clausen } 228b4e3ac0aSLars-Peter Clausen 229a980e046SJonathan Cameron static ssize_t iio_ev_state_store(struct device *dev, 230a980e046SJonathan Cameron struct device_attribute *attr, 231a980e046SJonathan Cameron const char *buf, 232a980e046SJonathan Cameron size_t len) 233a980e046SJonathan Cameron { 234e53f5ac5SLars-Peter Clausen struct iio_dev *indio_dev = dev_to_iio_dev(dev); 235a980e046SJonathan Cameron struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); 236a980e046SJonathan Cameron int ret; 237a980e046SJonathan Cameron bool val; 238a980e046SJonathan Cameron 239a980e046SJonathan Cameron ret = strtobool(buf, &val); 240a980e046SJonathan Cameron if (ret < 0) 241a980e046SJonathan Cameron return ret; 242a980e046SJonathan Cameron 243a980e046SJonathan Cameron ret = indio_dev->info->write_event_config(indio_dev, 244b4e3ac0aSLars-Peter Clausen this_attr->c, iio_ev_attr_type(this_attr), 245b4e3ac0aSLars-Peter Clausen iio_ev_attr_dir(this_attr), val); 246b4e3ac0aSLars-Peter Clausen 247a980e046SJonathan Cameron return (ret < 0) ? ret : len; 248a980e046SJonathan Cameron } 249a980e046SJonathan Cameron 250a980e046SJonathan Cameron static ssize_t iio_ev_state_show(struct device *dev, 251a980e046SJonathan Cameron struct device_attribute *attr, 252a980e046SJonathan Cameron char *buf) 253a980e046SJonathan Cameron { 254e53f5ac5SLars-Peter Clausen struct iio_dev *indio_dev = dev_to_iio_dev(dev); 255a980e046SJonathan Cameron struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); 256b4e3ac0aSLars-Peter Clausen int val; 257a980e046SJonathan Cameron 258b4e3ac0aSLars-Peter Clausen val = indio_dev->info->read_event_config(indio_dev, 259b4e3ac0aSLars-Peter Clausen this_attr->c, iio_ev_attr_type(this_attr), 260b4e3ac0aSLars-Peter Clausen iio_ev_attr_dir(this_attr)); 261a980e046SJonathan Cameron if (val < 0) 262a980e046SJonathan Cameron return val; 263a980e046SJonathan Cameron else 264a980e046SJonathan Cameron return sprintf(buf, "%d\n", val); 265a980e046SJonathan Cameron } 266a980e046SJonathan Cameron 267a980e046SJonathan Cameron static ssize_t iio_ev_value_show(struct device *dev, 268a980e046SJonathan Cameron struct device_attribute *attr, 269a980e046SJonathan Cameron char *buf) 270a980e046SJonathan Cameron { 271e53f5ac5SLars-Peter Clausen struct iio_dev *indio_dev = dev_to_iio_dev(dev); 272a980e046SJonathan Cameron struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); 2739fbfb4b3SSrinivas Pandruvada int val, val2, val_arr[2]; 274b4e3ac0aSLars-Peter Clausen int ret; 275a980e046SJonathan Cameron 276a980e046SJonathan Cameron ret = indio_dev->info->read_event_value(indio_dev, 277b4e3ac0aSLars-Peter Clausen this_attr->c, iio_ev_attr_type(this_attr), 278b4e3ac0aSLars-Peter Clausen iio_ev_attr_dir(this_attr), iio_ev_attr_info(this_attr), 279b4e3ac0aSLars-Peter Clausen &val, &val2); 280b4e3ac0aSLars-Peter Clausen if (ret < 0) 281b4e3ac0aSLars-Peter Clausen return ret; 2829fbfb4b3SSrinivas Pandruvada val_arr[0] = val; 2839fbfb4b3SSrinivas Pandruvada val_arr[1] = val2; 2849fbfb4b3SSrinivas Pandruvada return iio_format_value(buf, ret, 2, val_arr); 285b4e3ac0aSLars-Peter Clausen } 286a980e046SJonathan Cameron 287a980e046SJonathan Cameron static ssize_t iio_ev_value_store(struct device *dev, 288a980e046SJonathan Cameron struct device_attribute *attr, 289a980e046SJonathan Cameron const char *buf, 290a980e046SJonathan Cameron size_t len) 291a980e046SJonathan Cameron { 292e53f5ac5SLars-Peter Clausen struct iio_dev *indio_dev = dev_to_iio_dev(dev); 293a980e046SJonathan Cameron struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); 294b4e3ac0aSLars-Peter Clausen int val, val2; 295a980e046SJonathan Cameron int ret; 296a980e046SJonathan Cameron 297cb955852SLars-Peter Clausen if (!indio_dev->info->write_event_value) 298a980e046SJonathan Cameron return -EINVAL; 299a980e046SJonathan Cameron 300b4e3ac0aSLars-Peter Clausen ret = iio_str_to_fixpoint(buf, 100000, &val, &val2); 301b4e3ac0aSLars-Peter Clausen if (ret) 302b4e3ac0aSLars-Peter Clausen return ret; 303cb955852SLars-Peter Clausen ret = indio_dev->info->write_event_value(indio_dev, 304b4e3ac0aSLars-Peter Clausen this_attr->c, iio_ev_attr_type(this_attr), 305b4e3ac0aSLars-Peter Clausen iio_ev_attr_dir(this_attr), iio_ev_attr_info(this_attr), 306b4e3ac0aSLars-Peter Clausen val, val2); 307a980e046SJonathan Cameron if (ret < 0) 308a980e046SJonathan Cameron return ret; 309a980e046SJonathan Cameron 310a980e046SJonathan Cameron return len; 311a980e046SJonathan Cameron } 312a980e046SJonathan Cameron 313b4e3ac0aSLars-Peter Clausen static int iio_device_add_event(struct iio_dev *indio_dev, 314b4e3ac0aSLars-Peter Clausen const struct iio_chan_spec *chan, unsigned int spec_index, 315b4e3ac0aSLars-Peter Clausen enum iio_event_type type, enum iio_event_direction dir, 316b4e3ac0aSLars-Peter Clausen enum iio_shared_by shared_by, const unsigned long *mask) 317b4e3ac0aSLars-Peter Clausen { 318b4e3ac0aSLars-Peter Clausen ssize_t (*show)(struct device *, struct device_attribute *, char *); 319b4e3ac0aSLars-Peter Clausen ssize_t (*store)(struct device *, struct device_attribute *, 320b4e3ac0aSLars-Peter Clausen const char *, size_t); 321b4e3ac0aSLars-Peter Clausen unsigned int attrcount = 0; 322b4e3ac0aSLars-Peter Clausen unsigned int i; 323b4e3ac0aSLars-Peter Clausen char *postfix; 324b4e3ac0aSLars-Peter Clausen int ret; 325b4e3ac0aSLars-Peter Clausen 326ef4b4856SJonathan Cameron for_each_set_bit(i, mask, sizeof(*mask)*8) { 327ef4b4856SJonathan Cameron if (i >= ARRAY_SIZE(iio_ev_info_text)) 328ef4b4856SJonathan Cameron return -EINVAL; 329b4e3ac0aSLars-Peter Clausen postfix = kasprintf(GFP_KERNEL, "%s_%s_%s", 330b4e3ac0aSLars-Peter Clausen iio_ev_type_text[type], iio_ev_dir_text[dir], 331b4e3ac0aSLars-Peter Clausen iio_ev_info_text[i]); 332b4e3ac0aSLars-Peter Clausen if (postfix == NULL) 333b4e3ac0aSLars-Peter Clausen return -ENOMEM; 334b4e3ac0aSLars-Peter Clausen 335b4e3ac0aSLars-Peter Clausen if (i == IIO_EV_INFO_ENABLE) { 336b4e3ac0aSLars-Peter Clausen show = iio_ev_state_show; 337b4e3ac0aSLars-Peter Clausen store = iio_ev_state_store; 338b4e3ac0aSLars-Peter Clausen } else { 339b4e3ac0aSLars-Peter Clausen show = iio_ev_value_show; 340b4e3ac0aSLars-Peter Clausen store = iio_ev_value_store; 341b4e3ac0aSLars-Peter Clausen } 342b4e3ac0aSLars-Peter Clausen 343b4e3ac0aSLars-Peter Clausen ret = __iio_add_chan_devattr(postfix, chan, show, store, 344b4e3ac0aSLars-Peter Clausen (i << 16) | spec_index, shared_by, &indio_dev->dev, 345b4e3ac0aSLars-Peter Clausen &indio_dev->event_interface->dev_attr_list); 346b4e3ac0aSLars-Peter Clausen kfree(postfix); 347b4e3ac0aSLars-Peter Clausen 348b4e3ac0aSLars-Peter Clausen if (ret) 349b4e3ac0aSLars-Peter Clausen return ret; 350b4e3ac0aSLars-Peter Clausen 351b4e3ac0aSLars-Peter Clausen attrcount++; 352b4e3ac0aSLars-Peter Clausen } 353b4e3ac0aSLars-Peter Clausen 354b4e3ac0aSLars-Peter Clausen return attrcount; 355b4e3ac0aSLars-Peter Clausen } 356b4e3ac0aSLars-Peter Clausen 357cb955852SLars-Peter Clausen static int iio_device_add_event_sysfs(struct iio_dev *indio_dev, 358b4e3ac0aSLars-Peter Clausen struct iio_chan_spec const *chan) 359b4e3ac0aSLars-Peter Clausen { 360b4e3ac0aSLars-Peter Clausen int ret = 0, i, attrcount = 0; 361b4e3ac0aSLars-Peter Clausen enum iio_event_direction dir; 362b4e3ac0aSLars-Peter Clausen enum iio_event_type type; 363b4e3ac0aSLars-Peter Clausen 364b4e3ac0aSLars-Peter Clausen for (i = 0; i < chan->num_event_specs; i++) { 365b4e3ac0aSLars-Peter Clausen type = chan->event_spec[i].type; 366b4e3ac0aSLars-Peter Clausen dir = chan->event_spec[i].dir; 367b4e3ac0aSLars-Peter Clausen 368b4e3ac0aSLars-Peter Clausen ret = iio_device_add_event(indio_dev, chan, i, type, dir, 369b4e3ac0aSLars-Peter Clausen IIO_SEPARATE, &chan->event_spec[i].mask_separate); 370b4e3ac0aSLars-Peter Clausen if (ret < 0) 37192825ff9SHartmut Knaack return ret; 372b4e3ac0aSLars-Peter Clausen attrcount += ret; 373b4e3ac0aSLars-Peter Clausen 374b4e3ac0aSLars-Peter Clausen ret = iio_device_add_event(indio_dev, chan, i, type, dir, 375b4e3ac0aSLars-Peter Clausen IIO_SHARED_BY_TYPE, 376b4e3ac0aSLars-Peter Clausen &chan->event_spec[i].mask_shared_by_type); 377b4e3ac0aSLars-Peter Clausen if (ret < 0) 37892825ff9SHartmut Knaack return ret; 379b4e3ac0aSLars-Peter Clausen attrcount += ret; 380b4e3ac0aSLars-Peter Clausen 381b4e3ac0aSLars-Peter Clausen ret = iio_device_add_event(indio_dev, chan, i, type, dir, 382b4e3ac0aSLars-Peter Clausen IIO_SHARED_BY_DIR, 383b4e3ac0aSLars-Peter Clausen &chan->event_spec[i].mask_shared_by_dir); 384b4e3ac0aSLars-Peter Clausen if (ret < 0) 38592825ff9SHartmut Knaack return ret; 386b4e3ac0aSLars-Peter Clausen attrcount += ret; 387b4e3ac0aSLars-Peter Clausen 388b4e3ac0aSLars-Peter Clausen ret = iio_device_add_event(indio_dev, chan, i, type, dir, 389b4e3ac0aSLars-Peter Clausen IIO_SHARED_BY_ALL, 390b4e3ac0aSLars-Peter Clausen &chan->event_spec[i].mask_shared_by_all); 391b4e3ac0aSLars-Peter Clausen if (ret < 0) 39292825ff9SHartmut Knaack return ret; 393b4e3ac0aSLars-Peter Clausen attrcount += ret; 394b4e3ac0aSLars-Peter Clausen } 395b4e3ac0aSLars-Peter Clausen ret = attrcount; 396b4e3ac0aSLars-Peter Clausen return ret; 397b4e3ac0aSLars-Peter Clausen } 398b4e3ac0aSLars-Peter Clausen 399a980e046SJonathan Cameron static inline int __iio_add_event_config_attrs(struct iio_dev *indio_dev) 400a980e046SJonathan Cameron { 401a980e046SJonathan Cameron int j, ret, attrcount = 0; 402a980e046SJonathan Cameron 403a980e046SJonathan Cameron /* Dynically created from the channels array */ 404a980e046SJonathan Cameron for (j = 0; j < indio_dev->num_channels; j++) { 405a980e046SJonathan Cameron ret = iio_device_add_event_sysfs(indio_dev, 406a980e046SJonathan Cameron &indio_dev->channels[j]); 407a980e046SJonathan Cameron if (ret < 0) 408e3db9ef6SJulia Lawall return ret; 409a980e046SJonathan Cameron attrcount += ret; 410a980e046SJonathan Cameron } 411a980e046SJonathan Cameron return attrcount; 412a980e046SJonathan Cameron } 413a980e046SJonathan Cameron 414a980e046SJonathan Cameron static bool iio_check_for_dynamic_events(struct iio_dev *indio_dev) 415a980e046SJonathan Cameron { 416a980e046SJonathan Cameron int j; 417a980e046SJonathan Cameron 418b4e3ac0aSLars-Peter Clausen for (j = 0; j < indio_dev->num_channels; j++) { 419b4e3ac0aSLars-Peter Clausen if (indio_dev->channels[j].num_event_specs != 0) 420b4e3ac0aSLars-Peter Clausen return true; 421b4e3ac0aSLars-Peter Clausen } 422a980e046SJonathan Cameron return false; 423a980e046SJonathan Cameron } 424a980e046SJonathan Cameron 425a980e046SJonathan Cameron static void iio_setup_ev_int(struct iio_event_interface *ev_int) 426a980e046SJonathan Cameron { 427a980e046SJonathan Cameron INIT_KFIFO(ev_int->det_events); 428a980e046SJonathan Cameron init_waitqueue_head(&ev_int->wait); 429b91accafSLars-Peter Clausen mutex_init(&ev_int->read_lock); 430a980e046SJonathan Cameron } 431a980e046SJonathan Cameron 432a980e046SJonathan Cameron static const char *iio_event_group_name = "events"; 433a980e046SJonathan Cameron int iio_device_register_eventset(struct iio_dev *indio_dev) 434a980e046SJonathan Cameron { 435a980e046SJonathan Cameron struct iio_dev_attr *p; 436a980e046SJonathan Cameron int ret = 0, attrcount_orig = 0, attrcount, attrn; 437a980e046SJonathan Cameron struct attribute **attr; 438a980e046SJonathan Cameron 439a980e046SJonathan Cameron if (!(indio_dev->info->event_attrs || 440a980e046SJonathan Cameron iio_check_for_dynamic_events(indio_dev))) 441a980e046SJonathan Cameron return 0; 442a980e046SJonathan Cameron 443a980e046SJonathan Cameron indio_dev->event_interface = 444a980e046SJonathan Cameron kzalloc(sizeof(struct iio_event_interface), GFP_KERNEL); 44592825ff9SHartmut Knaack if (indio_dev->event_interface == NULL) 44692825ff9SHartmut Knaack return -ENOMEM; 447a980e046SJonathan Cameron 44846b24311SSascha Hauer INIT_LIST_HEAD(&indio_dev->event_interface->dev_attr_list); 44946b24311SSascha Hauer 450a980e046SJonathan Cameron iio_setup_ev_int(indio_dev->event_interface); 451a980e046SJonathan Cameron if (indio_dev->info->event_attrs != NULL) { 452a980e046SJonathan Cameron attr = indio_dev->info->event_attrs->attrs; 453a980e046SJonathan Cameron while (*attr++ != NULL) 454a980e046SJonathan Cameron attrcount_orig++; 455a980e046SJonathan Cameron } 456a980e046SJonathan Cameron attrcount = attrcount_orig; 457a980e046SJonathan Cameron if (indio_dev->channels) { 458a980e046SJonathan Cameron ret = __iio_add_event_config_attrs(indio_dev); 459a980e046SJonathan Cameron if (ret < 0) 460a980e046SJonathan Cameron goto error_free_setup_event_lines; 461a980e046SJonathan Cameron attrcount += ret; 462a980e046SJonathan Cameron } 463a980e046SJonathan Cameron 464a980e046SJonathan Cameron indio_dev->event_interface->group.name = iio_event_group_name; 465a980e046SJonathan Cameron indio_dev->event_interface->group.attrs = kcalloc(attrcount + 1, 466a980e046SJonathan Cameron sizeof(indio_dev->event_interface->group.attrs[0]), 467a980e046SJonathan Cameron GFP_KERNEL); 468a980e046SJonathan Cameron if (indio_dev->event_interface->group.attrs == NULL) { 469a980e046SJonathan Cameron ret = -ENOMEM; 470a980e046SJonathan Cameron goto error_free_setup_event_lines; 471a980e046SJonathan Cameron } 472a980e046SJonathan Cameron if (indio_dev->info->event_attrs) 473a980e046SJonathan Cameron memcpy(indio_dev->event_interface->group.attrs, 474a980e046SJonathan Cameron indio_dev->info->event_attrs->attrs, 475a980e046SJonathan Cameron sizeof(indio_dev->event_interface->group.attrs[0]) 476a980e046SJonathan Cameron *attrcount_orig); 477a980e046SJonathan Cameron attrn = attrcount_orig; 478a980e046SJonathan Cameron /* Add all elements from the list. */ 479a980e046SJonathan Cameron list_for_each_entry(p, 480a980e046SJonathan Cameron &indio_dev->event_interface->dev_attr_list, 481a980e046SJonathan Cameron l) 482a980e046SJonathan Cameron indio_dev->event_interface->group.attrs[attrn++] = 483a980e046SJonathan Cameron &p->dev_attr.attr; 484a980e046SJonathan Cameron indio_dev->groups[indio_dev->groupcounter++] = 485a980e046SJonathan Cameron &indio_dev->event_interface->group; 486a980e046SJonathan Cameron 487a980e046SJonathan Cameron return 0; 488a980e046SJonathan Cameron 489a980e046SJonathan Cameron error_free_setup_event_lines: 49084088ebdSLars-Peter Clausen iio_free_chan_devattr_list(&indio_dev->event_interface->dev_attr_list); 491a980e046SJonathan Cameron kfree(indio_dev->event_interface); 492a980e046SJonathan Cameron return ret; 493a980e046SJonathan Cameron } 494a980e046SJonathan Cameron 495d2f0a48fSLars-Peter Clausen /** 496d2f0a48fSLars-Peter Clausen * iio_device_wakeup_eventset - Wakes up the event waitqueue 497d2f0a48fSLars-Peter Clausen * @indio_dev: The IIO device 498d2f0a48fSLars-Peter Clausen * 499d2f0a48fSLars-Peter Clausen * Wakes up the event waitqueue used for poll() and blocking read(). 500d2f0a48fSLars-Peter Clausen * Should usually be called when the device is unregistered. 501d2f0a48fSLars-Peter Clausen */ 502d2f0a48fSLars-Peter Clausen void iio_device_wakeup_eventset(struct iio_dev *indio_dev) 503d2f0a48fSLars-Peter Clausen { 504d2f0a48fSLars-Peter Clausen if (indio_dev->event_interface == NULL) 505d2f0a48fSLars-Peter Clausen return; 506d2f0a48fSLars-Peter Clausen wake_up(&indio_dev->event_interface->wait); 507d2f0a48fSLars-Peter Clausen } 508d2f0a48fSLars-Peter Clausen 509a980e046SJonathan Cameron void iio_device_unregister_eventset(struct iio_dev *indio_dev) 510a980e046SJonathan Cameron { 511a980e046SJonathan Cameron if (indio_dev->event_interface == NULL) 512a980e046SJonathan Cameron return; 51384088ebdSLars-Peter Clausen iio_free_chan_devattr_list(&indio_dev->event_interface->dev_attr_list); 514a980e046SJonathan Cameron kfree(indio_dev->event_interface->group.attrs); 515a980e046SJonathan Cameron kfree(indio_dev->event_interface); 516a980e046SJonathan Cameron } 517