diff options
Diffstat (limited to 'drivers/staging/iio/industrialio-core.c')
| -rw-r--r-- | drivers/staging/iio/industrialio-core.c | 851 |
1 files changed, 851 insertions, 0 deletions
diff --git a/drivers/staging/iio/industrialio-core.c b/drivers/staging/iio/industrialio-core.c new file mode 100644 index 000000000000..660a9c1a1f3f --- /dev/null +++ b/drivers/staging/iio/industrialio-core.c @@ -0,0 +1,851 @@ +/* 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/cdev.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_nodename(struct device *dev) +{ + return kasprintf(GFP_KERNEL, "iio/%s", dev_name(dev)); +} + +struct class iio_class = { + .name = "iio", + .nodename = iio_nodename, +}; +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) + return 0; + ev = kmalloc(sizeof(*ev), GFP_KERNEL); + if (ev == NULL) { + ret = -ENOMEM; + 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 */ +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); + +ssize_t iio_event_chrdev_read(struct file *filep, + char *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 even 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. + */ + spin_lock(&el->shared_pointer->lock); + if (el->shared_pointer) + (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; +} + +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; +} + +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); +} + +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) + 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"); |