/* 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 "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)
                        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");