| /* The industrial I/O core |
| * |
| * Copyright (c) 2008 Jonathan Cameron |
| * |
| * This program is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 as published by |
| * the Free Software Foundation. |
| * |
| * Based on elements of hwmon and input subsystems. |
| */ |
| |
| #include <linux/kernel.h> |
| #include <linux/module.h> |
| #include <linux/idr.h> |
| #include <linux/kdev_t.h> |
| #include <linux/err.h> |
| #include <linux/device.h> |
| #include <linux/fs.h> |
| #include <linux/interrupt.h> |
| #include <linux/poll.h> |
| #include <linux/sched.h> |
| #include <linux/wait.h> |
| #include <linux/cdev.h> |
| #include <linux/slab.h> |
| #include "iio.h" |
| #include "trigger_consumer.h" |
| |
| #define IIO_ID_PREFIX "device" |
| #define IIO_ID_FORMAT IIO_ID_PREFIX "%d" |
| |
| /* IDR to assign each registered device a unique id*/ |
| static DEFINE_IDR(iio_idr); |
| |
| /* IDR for general event identifiers */ |
| static DEFINE_IDR(iio_event_idr); |
| /* IDR to allocate character device minor numbers */ |
| static DEFINE_IDR(iio_chrdev_idr); |
| /* Lock used to protect both of the above */ |
| static DEFINE_SPINLOCK(iio_idr_lock); |
| |
| dev_t iio_devt; |
| EXPORT_SYMBOL(iio_devt); |
| |
| #define IIO_DEV_MAX 256 |
| static char *iio_devnode(struct device *dev, mode_t *mode) |
| { |
| return kasprintf(GFP_KERNEL, "iio/%s", dev_name(dev)); |
| } |
| |
| struct class iio_class = { |
| .name = "iio", |
| .devnode = iio_devnode, |
| }; |
| EXPORT_SYMBOL(iio_class); |
| |
| void __iio_change_event(struct iio_detected_event_list *ev, |
| int ev_code, |
| s64 timestamp) |
| { |
| ev->ev.id = ev_code; |
| ev->ev.timestamp = timestamp; |
| } |
| EXPORT_SYMBOL(__iio_change_event); |
| |
| /* Used both in the interrupt line put events and the ring buffer ones */ |
| |
| /* Note that in it's current form someone has to be listening before events |
| * are queued. Hence a client MUST open the chrdev before the ring buffer is |
| * switched on. |
| */ |
| int __iio_push_event(struct iio_event_interface *ev_int, |
| int ev_code, |
| s64 timestamp, |
| struct iio_shared_ev_pointer * |
| shared_pointer_p) |
| { |
| struct iio_detected_event_list *ev; |
| int ret = 0; |
| |
| /* Does anyone care? */ |
| mutex_lock(&ev_int->event_list_lock); |
| if (test_bit(IIO_BUSY_BIT_POS, &ev_int->handler.flags)) { |
| if (ev_int->current_events == ev_int->max_events) { |
| mutex_unlock(&ev_int->event_list_lock); |
| return 0; |
| } |
| ev = kmalloc(sizeof(*ev), GFP_KERNEL); |
| if (ev == NULL) { |
| ret = -ENOMEM; |
| mutex_unlock(&ev_int->event_list_lock); |
| goto error_ret; |
| } |
| ev->ev.id = ev_code; |
| ev->ev.timestamp = timestamp; |
| ev->shared_pointer = shared_pointer_p; |
| if (ev->shared_pointer) |
| shared_pointer_p->ev_p = ev; |
| |
| list_add_tail(&ev->list, &ev_int->det_events.list); |
| ev_int->current_events++; |
| mutex_unlock(&ev_int->event_list_lock); |
| wake_up_interruptible(&ev_int->wait); |
| } else |
| mutex_unlock(&ev_int->event_list_lock); |
| |
| error_ret: |
| return ret; |
| } |
| EXPORT_SYMBOL(__iio_push_event); |
| |
| int iio_push_event(struct iio_dev *dev_info, |
| int ev_line, |
| int ev_code, |
| s64 timestamp) |
| { |
| return __iio_push_event(&dev_info->event_interfaces[ev_line], |
| ev_code, timestamp, NULL); |
| } |
| EXPORT_SYMBOL(iio_push_event); |
| |
| /* Generic interrupt line interrupt handler */ |
| static irqreturn_t iio_interrupt_handler(int irq, void *_int_info) |
| { |
| struct iio_interrupt *int_info = _int_info; |
| struct iio_dev *dev_info = int_info->dev_info; |
| struct iio_event_handler_list *p; |
| s64 time_ns; |
| unsigned long flags; |
| |
| spin_lock_irqsave(&int_info->ev_list_lock, flags); |
| if (list_empty(&int_info->ev_list)) { |
| spin_unlock_irqrestore(&int_info->ev_list_lock, flags); |
| return IRQ_NONE; |
| } |
| |
| time_ns = iio_get_time_ns(); |
| /* detect single element list*/ |
| if (list_is_singular(&int_info->ev_list)) { |
| disable_irq_nosync(irq); |
| p = list_first_entry(&int_info->ev_list, |
| struct iio_event_handler_list, |
| list); |
| /* single event handler - maybe shared */ |
| p->handler(dev_info, 1, time_ns, !(p->refcount > 1)); |
| } else |
| list_for_each_entry(p, &int_info->ev_list, list) { |
| disable_irq_nosync(irq); |
| p->handler(dev_info, 1, time_ns, 0); |
| } |
| spin_unlock_irqrestore(&int_info->ev_list_lock, flags); |
| |
| return IRQ_HANDLED; |
| } |
| |
| static struct iio_interrupt *iio_allocate_interrupt(void) |
| { |
| struct iio_interrupt *i = kmalloc(sizeof *i, GFP_KERNEL); |
| if (i) { |
| spin_lock_init(&i->ev_list_lock); |
| INIT_LIST_HEAD(&i->ev_list); |
| } |
| return i; |
| } |
| |
| /* Confirming the validity of supplied irq is left to drivers.*/ |
| int iio_register_interrupt_line(unsigned int irq, |
| struct iio_dev *dev_info, |
| int line_number, |
| unsigned long type, |
| const char *name) |
| { |
| int ret; |
| |
| dev_info->interrupts[line_number] = iio_allocate_interrupt(); |
| if (dev_info->interrupts[line_number] == NULL) { |
| ret = -ENOMEM; |
| goto error_ret; |
| } |
| dev_info->interrupts[line_number]->line_number = line_number; |
| dev_info->interrupts[line_number]->irq = irq; |
| dev_info->interrupts[line_number]->dev_info = dev_info; |
| |
| /* Possibly only request on demand? |
| * Can see this may complicate the handling of interrupts. |
| * However, with this approach we might end up handling lots of |
| * events no-one cares about.*/ |
| ret = request_irq(irq, |
| &iio_interrupt_handler, |
| type, |
| name, |
| dev_info->interrupts[line_number]); |
| |
| error_ret: |
| return ret; |
| } |
| EXPORT_SYMBOL(iio_register_interrupt_line); |
| |
| /* This turns up an awful lot */ |
| ssize_t iio_read_const_attr(struct device *dev, |
| struct device_attribute *attr, |
| char *buf) |
| { |
| return sprintf(buf, "%s\n", to_iio_const_attr(attr)->string); |
| } |
| EXPORT_SYMBOL(iio_read_const_attr); |
| |
| /* Before this runs the interrupt generator must have been disabled */ |
| void iio_unregister_interrupt_line(struct iio_dev *dev_info, int line_number) |
| { |
| /* make sure the interrupt handlers are all done */ |
| flush_scheduled_work(); |
| free_irq(dev_info->interrupts[line_number]->irq, |
| dev_info->interrupts[line_number]); |
| kfree(dev_info->interrupts[line_number]); |
| } |
| EXPORT_SYMBOL(iio_unregister_interrupt_line); |
| |
| /* Reference counted add and remove */ |
| void iio_add_event_to_list(struct iio_event_handler_list *el, |
| struct list_head *head) |
| { |
| unsigned long flags; |
| struct iio_interrupt *inter = to_iio_interrupt(head); |
| |
| /* take mutex to protect this element */ |
| mutex_lock(&el->exist_lock); |
| if (el->refcount == 0) { |
| /* Take the event list spin lock */ |
| spin_lock_irqsave(&inter->ev_list_lock, flags); |
| list_add(&el->list, head); |
| spin_unlock_irqrestore(&inter->ev_list_lock, flags); |
| } |
| el->refcount++; |
| mutex_unlock(&el->exist_lock); |
| } |
| EXPORT_SYMBOL(iio_add_event_to_list); |
| |
| void iio_remove_event_from_list(struct iio_event_handler_list *el, |
| struct list_head *head) |
| { |
| unsigned long flags; |
| struct iio_interrupt *inter = to_iio_interrupt(head); |
| |
| mutex_lock(&el->exist_lock); |
| el->refcount--; |
| if (el->refcount == 0) { |
| /* Take the event list spin lock */ |
| spin_lock_irqsave(&inter->ev_list_lock, flags); |
| list_del_init(&el->list); |
| spin_unlock_irqrestore(&inter->ev_list_lock, flags); |
| } |
| mutex_unlock(&el->exist_lock); |
| } |
| EXPORT_SYMBOL(iio_remove_event_from_list); |
| |
| static ssize_t iio_event_chrdev_read(struct file *filep, |
| char __user *buf, |
| size_t count, |
| loff_t *f_ps) |
| { |
| struct iio_event_interface *ev_int = filep->private_data; |
| struct iio_detected_event_list *el; |
| int ret; |
| size_t len; |
| |
| mutex_lock(&ev_int->event_list_lock); |
| if (list_empty(&ev_int->det_events.list)) { |
| if (filep->f_flags & O_NONBLOCK) { |
| ret = -EAGAIN; |
| goto error_mutex_unlock; |
| } |
| mutex_unlock(&ev_int->event_list_lock); |
| /* Blocking on device; waiting for something to be there */ |
| ret = wait_event_interruptible(ev_int->wait, |
| !list_empty(&ev_int |
| ->det_events.list)); |
| if (ret) |
| goto error_ret; |
| /* Single access device so noone else can get the data */ |
| mutex_lock(&ev_int->event_list_lock); |
| } |
| |
| el = list_first_entry(&ev_int->det_events.list, |
| struct iio_detected_event_list, |
| list); |
| len = sizeof el->ev; |
| if (copy_to_user(buf, &(el->ev), len)) { |
| ret = -EFAULT; |
| goto error_mutex_unlock; |
| } |
| list_del(&el->list); |
| ev_int->current_events--; |
| mutex_unlock(&ev_int->event_list_lock); |
| /* |
| * Possible concurency issue if an update of this event is on its way |
| * through. May lead to new event being removed whilst the reported |
| * event was the unescalated event. In typical use case this is not a |
| * problem as userspace will say read half the buffer due to a 50% |
| * full event which would make the correct 100% full incorrect anyway. |
| */ |
| if (el->shared_pointer) { |
| spin_lock(&el->shared_pointer->lock); |
| (el->shared_pointer->ev_p) = NULL; |
| spin_unlock(&el->shared_pointer->lock); |
| } |
| kfree(el); |
| |
| return len; |
| |
| error_mutex_unlock: |
| mutex_unlock(&ev_int->event_list_lock); |
| error_ret: |
| |
| return ret; |
| } |
| |
| static int iio_event_chrdev_release(struct inode *inode, struct file *filep) |
| { |
| struct iio_handler *hand = iio_cdev_to_handler(inode->i_cdev); |
| struct iio_event_interface *ev_int = hand->private; |
| struct iio_detected_event_list *el, *t; |
| |
| mutex_lock(&ev_int->event_list_lock); |
| clear_bit(IIO_BUSY_BIT_POS, &ev_int->handler.flags); |
| /* |
| * In order to maintain a clean state for reopening, |
| * clear out any awaiting events. The mask will prevent |
| * any new __iio_push_event calls running. |
| */ |
| list_for_each_entry_safe(el, t, &ev_int->det_events.list, list) { |
| list_del(&el->list); |
| kfree(el); |
| } |
| mutex_unlock(&ev_int->event_list_lock); |
| |
| return 0; |
| } |
| |
| static int iio_event_chrdev_open(struct inode *inode, struct file *filep) |
| { |
| struct iio_handler *hand = iio_cdev_to_handler(inode->i_cdev); |
| struct iio_event_interface *ev_int = hand->private; |
| |
| mutex_lock(&ev_int->event_list_lock); |
| if (test_and_set_bit(IIO_BUSY_BIT_POS, &hand->flags)) { |
| fops_put(filep->f_op); |
| mutex_unlock(&ev_int->event_list_lock); |
| return -EBUSY; |
| } |
| filep->private_data = hand->private; |
| mutex_unlock(&ev_int->event_list_lock); |
| |
| return 0; |
| } |
| |
| static const struct file_operations iio_event_chrdev_fileops = { |
| .read = iio_event_chrdev_read, |
| .release = iio_event_chrdev_release, |
| .open = iio_event_chrdev_open, |
| .owner = THIS_MODULE, |
| }; |
| |
| static void iio_event_dev_release(struct device *dev) |
| { |
| struct iio_event_interface *ev_int |
| = container_of(dev, struct iio_event_interface, dev); |
| cdev_del(&ev_int->handler.chrdev); |
| iio_device_free_chrdev_minor(MINOR(dev->devt)); |
| }; |
| |
| static struct device_type iio_event_type = { |
| .release = iio_event_dev_release, |
| }; |
| |
| int iio_device_get_chrdev_minor(void) |
| { |
| int ret, val; |
| |
| idr_again: |
| if (unlikely(idr_pre_get(&iio_chrdev_idr, GFP_KERNEL) == 0)) |
| return -ENOMEM; |
| spin_lock(&iio_idr_lock); |
| ret = idr_get_new(&iio_chrdev_idr, NULL, &val); |
| spin_unlock(&iio_idr_lock); |
| if (unlikely(ret == -EAGAIN)) |
| goto idr_again; |
| else if (unlikely(ret)) |
| return ret; |
| if (val > IIO_DEV_MAX) |
| return -ENOMEM; |
| return val; |
| } |
| |
| void iio_device_free_chrdev_minor(int val) |
| { |
| spin_lock(&iio_idr_lock); |
| idr_remove(&iio_chrdev_idr, val); |
| spin_unlock(&iio_idr_lock); |
| } |
| |
| int iio_setup_ev_int(struct iio_event_interface *ev_int, |
| const char *name, |
| struct module *owner, |
| struct device *dev) |
| { |
| int ret, minor; |
| |
| ev_int->dev.class = &iio_class; |
| ev_int->dev.parent = dev; |
| ev_int->dev.type = &iio_event_type; |
| device_initialize(&ev_int->dev); |
| |
| minor = iio_device_get_chrdev_minor(); |
| if (minor < 0) { |
| ret = minor; |
| goto error_device_put; |
| } |
| ev_int->dev.devt = MKDEV(MAJOR(iio_devt), minor); |
| dev_set_name(&ev_int->dev, "%s", name); |
| |
| ret = device_add(&ev_int->dev); |
| if (ret) |
| goto error_free_minor; |
| |
| cdev_init(&ev_int->handler.chrdev, &iio_event_chrdev_fileops); |
| ev_int->handler.chrdev.owner = owner; |
| |
| mutex_init(&ev_int->event_list_lock); |
| /* discussion point - make this variable? */ |
| ev_int->max_events = 10; |
| ev_int->current_events = 0; |
| INIT_LIST_HEAD(&ev_int->det_events.list); |
| init_waitqueue_head(&ev_int->wait); |
| ev_int->handler.private = ev_int; |
| ev_int->handler.flags = 0; |
| |
| ret = cdev_add(&ev_int->handler.chrdev, ev_int->dev.devt, 1); |
| if (ret) |
| goto error_unreg_device; |
| |
| return 0; |
| |
| error_unreg_device: |
| device_unregister(&ev_int->dev); |
| error_free_minor: |
| iio_device_free_chrdev_minor(minor); |
| error_device_put: |
| put_device(&ev_int->dev); |
| |
| return ret; |
| } |
| |
| void iio_free_ev_int(struct iio_event_interface *ev_int) |
| { |
| device_unregister(&ev_int->dev); |
| put_device(&ev_int->dev); |
| } |
| |
| static int __init iio_dev_init(void) |
| { |
| int err; |
| |
| err = alloc_chrdev_region(&iio_devt, 0, IIO_DEV_MAX, "iio"); |
| if (err < 0) |
| printk(KERN_ERR "%s: failed to allocate char dev region\n", |
| __FILE__); |
| |
| return err; |
| } |
| |
| static void __exit iio_dev_exit(void) |
| { |
| if (iio_devt) |
| unregister_chrdev_region(iio_devt, IIO_DEV_MAX); |
| } |
| |
| static int __init iio_init(void) |
| { |
| int ret; |
| |
| /* Create sysfs class */ |
| ret = class_register(&iio_class); |
| if (ret < 0) { |
| printk(KERN_ERR |
| "%s could not create sysfs class\n", |
| __FILE__); |
| goto error_nothing; |
| } |
| |
| ret = iio_dev_init(); |
| if (ret < 0) |
| goto error_unregister_class; |
| |
| return 0; |
| |
| error_unregister_class: |
| class_unregister(&iio_class); |
| error_nothing: |
| return ret; |
| } |
| |
| static void __exit iio_exit(void) |
| { |
| iio_dev_exit(); |
| class_unregister(&iio_class); |
| } |
| |
| static int iio_device_register_sysfs(struct iio_dev *dev_info) |
| { |
| int ret = 0; |
| |
| ret = sysfs_create_group(&dev_info->dev.kobj, dev_info->attrs); |
| if (ret) { |
| dev_err(dev_info->dev.parent, |
| "Failed to register sysfs hooks\n"); |
| goto error_ret; |
| } |
| |
| if (dev_info->scan_el_attrs) { |
| ret = sysfs_create_group(&dev_info->dev.kobj, |
| dev_info->scan_el_attrs); |
| if (ret) |
| dev_err(&dev_info->dev, |
| "Failed to add sysfs scan els\n"); |
| } |
| |
| error_ret: |
| return ret; |
| } |
| |
| static void iio_device_unregister_sysfs(struct iio_dev *dev_info) |
| { |
| if (dev_info->scan_el_attrs) |
| sysfs_remove_group(&dev_info->dev.kobj, |
| dev_info->scan_el_attrs); |
| |
| sysfs_remove_group(&dev_info->dev.kobj, dev_info->attrs); |
| } |
| |
| /* This function return negative value if fails. */ |
| int iio_get_new_idr_val(struct idr *this_idr) |
| { |
| int ret; |
| int val; |
| |
| idr_again: |
| if (unlikely(idr_pre_get(this_idr, GFP_KERNEL) == 0)) |
| return -ENOMEM; |
| |
| spin_lock(&iio_idr_lock); |
| ret = idr_get_new(this_idr, NULL, &val); |
| spin_unlock(&iio_idr_lock); |
| if (unlikely(ret == -EAGAIN)) |
| goto idr_again; |
| else if (unlikely(ret)) |
| return ret; |
| |
| return val; |
| } |
| EXPORT_SYMBOL(iio_get_new_idr_val); |
| |
| void iio_free_idr_val(struct idr *this_idr, int id) |
| { |
| spin_lock(&iio_idr_lock); |
| idr_remove(this_idr, id); |
| spin_unlock(&iio_idr_lock); |
| } |
| EXPORT_SYMBOL(iio_free_idr_val); |
| |
| static int iio_device_register_id(struct iio_dev *dev_info, |
| struct idr *this_idr) |
| { |
| |
| dev_info->id = iio_get_new_idr_val(&iio_idr); |
| if (dev_info->id < 0) |
| return dev_info->id; |
| return 0; |
| } |
| |
| static void iio_device_unregister_id(struct iio_dev *dev_info) |
| { |
| iio_free_idr_val(&iio_idr, dev_info->id); |
| } |
| |
| static inline int __iio_add_event_config_attrs(struct iio_dev *dev_info, int i) |
| { |
| int ret; |
| /*p for adding, q for removing */ |
| struct attribute **attrp, **attrq; |
| |
| if (dev_info->event_conf_attrs && dev_info->event_conf_attrs[i].attrs) { |
| attrp = dev_info->event_conf_attrs[i].attrs; |
| while (*attrp) { |
| ret = sysfs_add_file_to_group(&dev_info->dev.kobj, |
| *attrp, |
| dev_info |
| ->event_attrs[i].name); |
| if (ret) |
| goto error_ret; |
| attrp++; |
| } |
| } |
| return 0; |
| |
| error_ret: |
| attrq = dev_info->event_conf_attrs[i].attrs; |
| while (attrq != attrp) { |
| sysfs_remove_file_from_group(&dev_info->dev.kobj, |
| *attrq, |
| dev_info->event_attrs[i].name); |
| attrq++; |
| } |
| |
| return ret; |
| } |
| |
| static inline int __iio_remove_event_config_attrs(struct iio_dev *dev_info, |
| int i) |
| { |
| struct attribute **attrq; |
| |
| if (dev_info->event_conf_attrs |
| && dev_info->event_conf_attrs[i].attrs) { |
| attrq = dev_info->event_conf_attrs[i].attrs; |
| while (*attrq) { |
| sysfs_remove_file_from_group(&dev_info->dev.kobj, |
| *attrq, |
| dev_info |
| ->event_attrs[i].name); |
| attrq++; |
| } |
| } |
| |
| return 0; |
| } |
| |
| static int iio_device_register_eventset(struct iio_dev *dev_info) |
| { |
| int ret = 0, i, j; |
| |
| if (dev_info->num_interrupt_lines == 0) |
| return 0; |
| |
| dev_info->event_interfaces = |
| kzalloc(sizeof(struct iio_event_interface) |
| *dev_info->num_interrupt_lines, |
| GFP_KERNEL); |
| if (dev_info->event_interfaces == NULL) { |
| ret = -ENOMEM; |
| goto error_ret; |
| } |
| |
| dev_info->interrupts = kzalloc(sizeof(struct iio_interrupt *) |
| *dev_info->num_interrupt_lines, |
| GFP_KERNEL); |
| if (dev_info->interrupts == NULL) { |
| ret = -ENOMEM; |
| goto error_free_event_interfaces; |
| } |
| |
| for (i = 0; i < dev_info->num_interrupt_lines; i++) { |
| dev_info->event_interfaces[i].owner = dev_info->driver_module; |
| ret = iio_get_new_idr_val(&iio_event_idr); |
| if (ret < 0) |
| goto error_free_setup_ev_ints; |
| else |
| dev_info->event_interfaces[i].id = ret; |
| |
| snprintf(dev_info->event_interfaces[i]._name, 20, |
| "event_line%d", |
| dev_info->event_interfaces[i].id); |
| |
| ret = iio_setup_ev_int(&dev_info->event_interfaces[i], |
| (const char *)(dev_info |
| ->event_interfaces[i] |
| ._name), |
| dev_info->driver_module, |
| &dev_info->dev); |
| if (ret) { |
| dev_err(&dev_info->dev, |
| "Could not get chrdev interface\n"); |
| iio_free_idr_val(&iio_event_idr, |
| dev_info->event_interfaces[i].id); |
| goto error_free_setup_ev_ints; |
| } |
| } |
| |
| for (i = 0; i < dev_info->num_interrupt_lines; i++) { |
| snprintf(dev_info->event_interfaces[i]._attrname, 20, |
| "event_line%d_sources", i); |
| dev_info->event_attrs[i].name |
| = (const char *) |
| (dev_info->event_interfaces[i]._attrname); |
| ret = sysfs_create_group(&dev_info->dev.kobj, |
| &dev_info->event_attrs[i]); |
| if (ret) { |
| dev_err(&dev_info->dev, |
| "Failed to register sysfs for event attrs"); |
| goto error_remove_sysfs_interfaces; |
| } |
| } |
| |
| for (i = 0; i < dev_info->num_interrupt_lines; i++) { |
| ret = __iio_add_event_config_attrs(dev_info, i); |
| if (ret) |
| goto error_unregister_config_attrs; |
| } |
| |
| return 0; |
| |
| error_unregister_config_attrs: |
| for (j = 0; j < i; j++) |
| __iio_remove_event_config_attrs(dev_info, i); |
| i = dev_info->num_interrupt_lines - 1; |
| error_remove_sysfs_interfaces: |
| for (j = 0; j < i; j++) |
| sysfs_remove_group(&dev_info->dev.kobj, |
| &dev_info->event_attrs[j]); |
| i = dev_info->num_interrupt_lines - 1; |
| error_free_setup_ev_ints: |
| for (j = 0; j < i; j++) { |
| iio_free_idr_val(&iio_event_idr, |
| dev_info->event_interfaces[i].id); |
| iio_free_ev_int(&dev_info->event_interfaces[j]); |
| } |
| kfree(dev_info->interrupts); |
| error_free_event_interfaces: |
| kfree(dev_info->event_interfaces); |
| error_ret: |
| |
| return ret; |
| } |
| |
| static void iio_device_unregister_eventset(struct iio_dev *dev_info) |
| { |
| int i; |
| |
| if (dev_info->num_interrupt_lines == 0) |
| return; |
| for (i = 0; i < dev_info->num_interrupt_lines; i++) |
| sysfs_remove_group(&dev_info->dev.kobj, |
| &dev_info->event_attrs[i]); |
| |
| for (i = 0; i < dev_info->num_interrupt_lines; i++) { |
| iio_free_idr_val(&iio_event_idr, |
| dev_info->event_interfaces[i].id); |
| iio_free_ev_int(&dev_info->event_interfaces[i]); |
| } |
| kfree(dev_info->interrupts); |
| kfree(dev_info->event_interfaces); |
| } |
| |
| static void iio_dev_release(struct device *device) |
| { |
| struct iio_dev *dev = to_iio_dev(device); |
| |
| iio_put(); |
| kfree(dev); |
| } |
| |
| static struct device_type iio_dev_type = { |
| .name = "iio_device", |
| .release = iio_dev_release, |
| }; |
| |
| struct iio_dev *iio_allocate_device(void) |
| { |
| struct iio_dev *dev = kzalloc(sizeof *dev, GFP_KERNEL); |
| |
| if (dev) { |
| dev->dev.type = &iio_dev_type; |
| dev->dev.class = &iio_class; |
| device_initialize(&dev->dev); |
| dev_set_drvdata(&dev->dev, (void *)dev); |
| mutex_init(&dev->mlock); |
| iio_get(); |
| } |
| |
| return dev; |
| } |
| EXPORT_SYMBOL(iio_allocate_device); |
| |
| void iio_free_device(struct iio_dev *dev) |
| { |
| if (dev) |
| iio_put_device(dev); |
| } |
| EXPORT_SYMBOL(iio_free_device); |
| |
| int iio_device_register(struct iio_dev *dev_info) |
| { |
| int ret; |
| |
| ret = iio_device_register_id(dev_info, &iio_idr); |
| if (ret) { |
| dev_err(&dev_info->dev, "Failed to get id\n"); |
| goto error_ret; |
| } |
| dev_set_name(&dev_info->dev, "device%d", dev_info->id); |
| |
| ret = device_add(&dev_info->dev); |
| if (ret) |
| goto error_free_idr; |
| ret = iio_device_register_sysfs(dev_info); |
| if (ret) { |
| dev_err(dev_info->dev.parent, |
| "Failed to register sysfs interfaces\n"); |
| goto error_del_device; |
| } |
| ret = iio_device_register_eventset(dev_info); |
| if (ret) { |
| dev_err(dev_info->dev.parent, |
| "Failed to register event set \n"); |
| goto error_free_sysfs; |
| } |
| if (dev_info->modes & INDIO_RING_TRIGGERED) |
| iio_device_register_trigger_consumer(dev_info); |
| |
| return 0; |
| |
| error_free_sysfs: |
| iio_device_unregister_sysfs(dev_info); |
| error_del_device: |
| device_del(&dev_info->dev); |
| error_free_idr: |
| iio_device_unregister_id(dev_info); |
| error_ret: |
| return ret; |
| } |
| EXPORT_SYMBOL(iio_device_register); |
| |
| void iio_device_unregister(struct iio_dev *dev_info) |
| { |
| if (dev_info->modes & INDIO_RING_TRIGGERED) |
| iio_device_unregister_trigger_consumer(dev_info); |
| iio_device_unregister_eventset(dev_info); |
| iio_device_unregister_sysfs(dev_info); |
| iio_device_unregister_id(dev_info); |
| device_unregister(&dev_info->dev); |
| } |
| EXPORT_SYMBOL(iio_device_unregister); |
| |
| void iio_put(void) |
| { |
| module_put(THIS_MODULE); |
| } |
| |
| void iio_get(void) |
| { |
| __module_get(THIS_MODULE); |
| } |
| |
| subsys_initcall(iio_init); |
| module_exit(iio_exit); |
| |
| MODULE_AUTHOR("Jonathan Cameron <jic23@cam.ac.uk>"); |
| MODULE_DESCRIPTION("Industrial I/O core"); |
| MODULE_LICENSE("GPL"); |