2009-08-18 19:06:19 +02:00
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/* The industrial I/O core
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*
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* Copyright (c) 2008 Jonathan Cameron
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published by
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* the Free Software Foundation.
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*
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* Based on elements of hwmon and input subsystems.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/idr.h>
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#include <linux/kdev_t.h>
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#include <linux/err.h>
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#include <linux/device.h>
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#include <linux/fs.h>
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#include <linux/interrupt.h>
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#include <linux/poll.h>
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#include <linux/cdev.h>
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#include "iio.h"
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#include "trigger_consumer.h"
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#define IIO_ID_PREFIX "device"
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#define IIO_ID_FORMAT IIO_ID_PREFIX "%d"
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/* IDR to assign each registered device a unique id*/
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static DEFINE_IDR(iio_idr);
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/* IDR for general event identifiers */
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static DEFINE_IDR(iio_event_idr);
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/* IDR to allocate character device minor numbers */
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static DEFINE_IDR(iio_chrdev_idr);
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/* Lock used to protect both of the above */
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static DEFINE_SPINLOCK(iio_idr_lock);
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dev_t iio_devt;
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EXPORT_SYMBOL(iio_devt);
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#define IIO_DEV_MAX 256
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2009-09-21 08:56:58 +02:00
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static char *iio_devnode(struct device *dev, mode_t *mode)
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2009-08-18 19:06:19 +02:00
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{
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return kasprintf(GFP_KERNEL, "iio/%s", dev_name(dev));
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}
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struct class iio_class = {
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.name = "iio",
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2009-09-21 08:56:58 +02:00
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.devnode = iio_devnode,
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2009-08-18 19:06:19 +02:00
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};
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EXPORT_SYMBOL(iio_class);
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void __iio_change_event(struct iio_detected_event_list *ev,
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int ev_code,
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s64 timestamp)
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{
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ev->ev.id = ev_code;
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ev->ev.timestamp = timestamp;
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}
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EXPORT_SYMBOL(__iio_change_event);
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/* Used both in the interrupt line put events and the ring buffer ones */
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/* Note that in it's current form someone has to be listening before events
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* are queued. Hence a client MUST open the chrdev before the ring buffer is
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* switched on.
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*/
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int __iio_push_event(struct iio_event_interface *ev_int,
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int ev_code,
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s64 timestamp,
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struct iio_shared_ev_pointer *
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shared_pointer_p)
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{
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struct iio_detected_event_list *ev;
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int ret = 0;
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/* Does anyone care? */
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mutex_lock(&ev_int->event_list_lock);
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if (test_bit(IIO_BUSY_BIT_POS, &ev_int->handler.flags)) {
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if (ev_int->current_events == ev_int->max_events)
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return 0;
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ev = kmalloc(sizeof(*ev), GFP_KERNEL);
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if (ev == NULL) {
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ret = -ENOMEM;
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goto error_ret;
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}
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ev->ev.id = ev_code;
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ev->ev.timestamp = timestamp;
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ev->shared_pointer = shared_pointer_p;
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if (ev->shared_pointer)
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shared_pointer_p->ev_p = ev;
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list_add_tail(&ev->list, &ev_int->det_events.list);
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ev_int->current_events++;
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mutex_unlock(&ev_int->event_list_lock);
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wake_up_interruptible(&ev_int->wait);
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} else
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mutex_unlock(&ev_int->event_list_lock);
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error_ret:
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return ret;
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}
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EXPORT_SYMBOL(__iio_push_event);
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int iio_push_event(struct iio_dev *dev_info,
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int ev_line,
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int ev_code,
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s64 timestamp)
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{
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return __iio_push_event(&dev_info->event_interfaces[ev_line],
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ev_code, timestamp, NULL);
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}
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EXPORT_SYMBOL(iio_push_event);
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/* Generic interrupt line interrupt handler */
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irqreturn_t iio_interrupt_handler(int irq, void *_int_info)
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{
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struct iio_interrupt *int_info = _int_info;
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struct iio_dev *dev_info = int_info->dev_info;
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struct iio_event_handler_list *p;
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s64 time_ns;
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unsigned long flags;
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spin_lock_irqsave(&int_info->ev_list_lock, flags);
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if (list_empty(&int_info->ev_list)) {
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spin_unlock_irqrestore(&int_info->ev_list_lock, flags);
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return IRQ_NONE;
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}
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time_ns = iio_get_time_ns();
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/* detect single element list*/
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if (list_is_singular(&int_info->ev_list)) {
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disable_irq_nosync(irq);
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p = list_first_entry(&int_info->ev_list,
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struct iio_event_handler_list,
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list);
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/* single event handler - maybe shared */
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p->handler(dev_info, 1, time_ns, !(p->refcount > 1));
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} else
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list_for_each_entry(p, &int_info->ev_list, list) {
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disable_irq_nosync(irq);
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p->handler(dev_info, 1, time_ns, 0);
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}
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spin_unlock_irqrestore(&int_info->ev_list_lock, flags);
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return IRQ_HANDLED;
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}
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static struct iio_interrupt *iio_allocate_interrupt(void)
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{
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struct iio_interrupt *i = kmalloc(sizeof *i, GFP_KERNEL);
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if (i) {
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spin_lock_init(&i->ev_list_lock);
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INIT_LIST_HEAD(&i->ev_list);
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}
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return i;
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}
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/* Confirming the validity of supplied irq is left to drivers.*/
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int iio_register_interrupt_line(unsigned int irq,
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struct iio_dev *dev_info,
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int line_number,
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unsigned long type,
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const char *name)
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{
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int ret;
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dev_info->interrupts[line_number] = iio_allocate_interrupt();
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if (dev_info->interrupts[line_number] == NULL) {
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ret = -ENOMEM;
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goto error_ret;
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}
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dev_info->interrupts[line_number]->line_number = line_number;
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dev_info->interrupts[line_number]->irq = irq;
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dev_info->interrupts[line_number]->dev_info = dev_info;
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/* Possibly only request on demand?
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* Can see this may complicate the handling of interrupts.
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* However, with this approach we might end up handling lots of
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* events no-one cares about.*/
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ret = request_irq(irq,
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&iio_interrupt_handler,
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type,
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name,
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dev_info->interrupts[line_number]);
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error_ret:
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return ret;
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}
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EXPORT_SYMBOL(iio_register_interrupt_line);
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/* This turns up an awful lot */
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ssize_t iio_read_const_attr(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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return sprintf(buf, "%s\n", to_iio_const_attr(attr)->string);
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}
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EXPORT_SYMBOL(iio_read_const_attr);
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/* Before this runs the interrupt generator must have been disabled */
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void iio_unregister_interrupt_line(struct iio_dev *dev_info, int line_number)
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{
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/* make sure the interrupt handlers are all done */
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flush_scheduled_work();
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free_irq(dev_info->interrupts[line_number]->irq,
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dev_info->interrupts[line_number]);
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kfree(dev_info->interrupts[line_number]);
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}
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EXPORT_SYMBOL(iio_unregister_interrupt_line);
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/* Reference counted add and remove */
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void iio_add_event_to_list(struct iio_event_handler_list *el,
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struct list_head *head)
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{
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unsigned long flags;
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struct iio_interrupt *inter = to_iio_interrupt(head);
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/* take mutex to protect this element */
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mutex_lock(&el->exist_lock);
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if (el->refcount == 0) {
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/* Take the event list spin lock */
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spin_lock_irqsave(&inter->ev_list_lock, flags);
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list_add(&el->list, head);
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spin_unlock_irqrestore(&inter->ev_list_lock, flags);
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}
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el->refcount++;
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mutex_unlock(&el->exist_lock);
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}
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EXPORT_SYMBOL(iio_add_event_to_list);
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void iio_remove_event_from_list(struct iio_event_handler_list *el,
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struct list_head *head)
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{
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unsigned long flags;
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struct iio_interrupt *inter = to_iio_interrupt(head);
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mutex_lock(&el->exist_lock);
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el->refcount--;
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if (el->refcount == 0) {
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/* Take the event list spin lock */
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spin_lock_irqsave(&inter->ev_list_lock, flags);
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list_del_init(&el->list);
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spin_unlock_irqrestore(&inter->ev_list_lock, flags);
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}
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mutex_unlock(&el->exist_lock);
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}
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EXPORT_SYMBOL(iio_remove_event_from_list);
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ssize_t iio_event_chrdev_read(struct file *filep,
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char *buf,
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size_t count,
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loff_t *f_ps)
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{
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struct iio_event_interface *ev_int = filep->private_data;
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struct iio_detected_event_list *el;
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int ret;
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size_t len;
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mutex_lock(&ev_int->event_list_lock);
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if (list_empty(&ev_int->det_events.list)) {
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if (filep->f_flags & O_NONBLOCK) {
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ret = -EAGAIN;
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goto error_mutex_unlock;
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}
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mutex_unlock(&ev_int->event_list_lock);
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/* Blocking on device; waiting for something to be there */
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ret = wait_event_interruptible(ev_int->wait,
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!list_empty(&ev_int
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->det_events.list));
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if (ret)
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goto error_ret;
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/* Single access device so noone else can get the data */
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mutex_lock(&ev_int->event_list_lock);
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}
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el = list_first_entry(&ev_int->det_events.list,
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struct iio_detected_event_list,
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list);
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len = sizeof el->ev;
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if (copy_to_user(buf, &(el->ev), len)) {
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ret = -EFAULT;
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goto error_mutex_unlock;
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}
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list_del(&el->list);
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ev_int->current_events--;
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mutex_unlock(&ev_int->event_list_lock);
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/*
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* Possible concurency issue if an update of this event is on its way
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* through. May lead to new even being removed whilst the reported event
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* was the unescalated event. In typical use case this is not a problem
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* as userspace will say read half the buffer due to a 50% full event
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* which would make the correct 100% full incorrect anyway.
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*/
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spin_lock(&el->shared_pointer->lock);
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if (el->shared_pointer)
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(el->shared_pointer->ev_p) = NULL;
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spin_unlock(&el->shared_pointer->lock);
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kfree(el);
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return len;
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error_mutex_unlock:
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mutex_unlock(&ev_int->event_list_lock);
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error_ret:
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return ret;
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}
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int iio_event_chrdev_release(struct inode *inode, struct file *filep)
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{
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struct iio_handler *hand = iio_cdev_to_handler(inode->i_cdev);
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struct iio_event_interface *ev_int = hand->private;
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struct iio_detected_event_list *el, *t;
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mutex_lock(&ev_int->event_list_lock);
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clear_bit(IIO_BUSY_BIT_POS, &ev_int->handler.flags);
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/*
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* In order to maintain a clean state for reopening,
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* clear out any awaiting events. The mask will prevent
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* any new __iio_push_event calls running.
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*/
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list_for_each_entry_safe(el, t, &ev_int->det_events.list, list) {
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list_del(&el->list);
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kfree(el);
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}
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mutex_unlock(&ev_int->event_list_lock);
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return 0;
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}
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int iio_event_chrdev_open(struct inode *inode, struct file *filep)
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{
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struct iio_handler *hand = iio_cdev_to_handler(inode->i_cdev);
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struct iio_event_interface *ev_int = hand->private;
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mutex_lock(&ev_int->event_list_lock);
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if (test_and_set_bit(IIO_BUSY_BIT_POS, &hand->flags)) {
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fops_put(filep->f_op);
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mutex_unlock(&ev_int->event_list_lock);
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return -EBUSY;
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}
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filep->private_data = hand->private;
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mutex_unlock(&ev_int->event_list_lock);
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return 0;
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}
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static const struct file_operations iio_event_chrdev_fileops = {
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.read = iio_event_chrdev_read,
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.release = iio_event_chrdev_release,
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.open = iio_event_chrdev_open,
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.owner = THIS_MODULE,
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};
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static void iio_event_dev_release(struct device *dev)
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{
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struct iio_event_interface *ev_int
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= container_of(dev, struct iio_event_interface, dev);
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cdev_del(&ev_int->handler.chrdev);
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iio_device_free_chrdev_minor(MINOR(dev->devt));
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};
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|
|
|
|
|
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");
|