1238 lines
29 KiB
C
1238 lines
29 KiB
C
/* 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/sched.h>
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#include <linux/wait.h>
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#include <linux/cdev.h>
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#include <linux/slab.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_IDA(iio_ida);
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/* IDR to allocate character device minor numbers */
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static DEFINE_IDA(iio_chrdev_ida);
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/* Lock used to protect both of the above */
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static DEFINE_SPINLOCK(iio_ida_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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struct bus_type iio_bus_type = {
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.name = "iio",
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};
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EXPORT_SYMBOL(iio_bus_type);
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static const char * const iio_chan_type_name_spec_shared[] = {
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[IIO_TIMESTAMP] = "timestamp",
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[IIO_ACCEL] = "accel",
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[IIO_IN] = "in",
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[IIO_CURRENT] = "current",
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[IIO_POWER] = "power",
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[IIO_IN_DIFF] = "in-in",
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[IIO_GYRO] = "gyro",
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[IIO_TEMP] = "temp",
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[IIO_MAGN] = "magn",
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[IIO_INCLI] = "incli",
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[IIO_ROT] = "rot",
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[IIO_INTENSITY] = "intensity",
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[IIO_LIGHT] = "illuminance",
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[IIO_ANGL] = "angl",
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};
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static const char * const iio_chan_type_name_spec_complex[] = {
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[IIO_IN_DIFF] = "in%d-in%d",
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};
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static const char * const iio_modifier_names_light[] = {
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[IIO_MOD_LIGHT_BOTH] = "both",
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[IIO_MOD_LIGHT_IR] = "ir",
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};
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static const char * const iio_modifier_names_axial[] = {
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[IIO_MOD_X] = "x",
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[IIO_MOD_Y] = "y",
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[IIO_MOD_Z] = "z",
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};
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/* relies on pairs of these shared then separate */
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static const char * const iio_chan_info_postfix[] = {
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[IIO_CHAN_INFO_SCALE_SHARED/2] = "scale",
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[IIO_CHAN_INFO_OFFSET_SHARED/2] = "offset",
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[IIO_CHAN_INFO_CALIBSCALE_SHARED/2] = "calibscale",
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[IIO_CHAN_INFO_CALIBBIAS_SHARED/2] = "calibbias",
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[IIO_CHAN_INFO_PEAK_SHARED/2] = "peak_raw",
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[IIO_CHAN_INFO_PEAK_SCALE_SHARED/2] = "peak_scale",
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};
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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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struct iio_event_interface *ev_int
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= &dev_info->event_interfaces[ev_line];
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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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mutex_unlock(&ev_int->event_list_lock);
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return 0;
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}
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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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mutex_unlock(&ev_int->event_list_lock);
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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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list_add_tail(&ev->list, &ev_int->det_events);
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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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/* 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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static ssize_t iio_event_chrdev_read(struct file *filep,
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char __user *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)) {
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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));
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if (ret)
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goto error_ret;
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/* Single access device so no one 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,
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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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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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static 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) {
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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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static 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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.llseek = noop_llseek,
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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 = {
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.release = iio_event_dev_release,
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};
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int iio_device_get_chrdev_minor(void)
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{
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int ret, val;
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ida_again:
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if (unlikely(ida_pre_get(&iio_chrdev_ida, GFP_KERNEL) == 0))
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return -ENOMEM;
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spin_lock(&iio_ida_lock);
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ret = ida_get_new(&iio_chrdev_ida, &val);
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spin_unlock(&iio_ida_lock);
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if (unlikely(ret == -EAGAIN))
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goto ida_again;
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else if (unlikely(ret))
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return ret;
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if (val > IIO_DEV_MAX)
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return -ENOMEM;
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return val;
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}
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void iio_device_free_chrdev_minor(int val)
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{
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spin_lock(&iio_ida_lock);
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ida_remove(&iio_chrdev_ida, val);
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spin_unlock(&iio_ida_lock);
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}
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static int iio_setup_ev_int(struct iio_event_interface *ev_int,
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const char *name,
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struct module *owner,
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struct device *dev)
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{
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int ret, minor;
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ev_int->dev.bus = &iio_bus_type;
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ev_int->dev.parent = dev;
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ev_int->dev.type = &iio_event_type;
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device_initialize(&ev_int->dev);
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minor = iio_device_get_chrdev_minor();
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if (minor < 0) {
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ret = minor;
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goto error_device_put;
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}
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ev_int->dev.devt = MKDEV(MAJOR(iio_devt), minor);
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dev_set_name(&ev_int->dev, "%s", name);
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ret = device_add(&ev_int->dev);
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if (ret)
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goto error_free_minor;
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cdev_init(&ev_int->handler.chrdev, &iio_event_chrdev_fileops);
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ev_int->handler.chrdev.owner = owner;
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mutex_init(&ev_int->event_list_lock);
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/* discussion point - make this variable? */
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ev_int->max_events = 10;
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ev_int->current_events = 0;
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INIT_LIST_HEAD(&ev_int->det_events);
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init_waitqueue_head(&ev_int->wait);
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ev_int->handler.private = ev_int;
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ev_int->handler.flags = 0;
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ret = cdev_add(&ev_int->handler.chrdev, ev_int->dev.devt, 1);
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if (ret)
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goto error_unreg_device;
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return 0;
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error_unreg_device:
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device_unregister(&ev_int->dev);
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error_free_minor:
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iio_device_free_chrdev_minor(minor);
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error_device_put:
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put_device(&ev_int->dev);
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return ret;
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}
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static void iio_free_ev_int(struct iio_event_interface *ev_int)
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{
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device_unregister(&ev_int->dev);
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put_device(&ev_int->dev);
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}
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static int __init iio_dev_init(void)
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{
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int err;
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err = alloc_chrdev_region(&iio_devt, 0, IIO_DEV_MAX, "iio");
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if (err < 0)
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printk(KERN_ERR "%s: failed to allocate char dev region\n",
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__FILE__);
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return err;
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}
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static void __exit iio_dev_exit(void)
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{
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if (iio_devt)
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unregister_chrdev_region(iio_devt, IIO_DEV_MAX);
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}
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static int __init iio_init(void)
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{
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int ret;
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/* Register sysfs bus */
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ret = bus_register(&iio_bus_type);
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if (ret < 0) {
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printk(KERN_ERR
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"%s could not register bus type\n",
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__FILE__);
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goto error_nothing;
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}
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ret = iio_dev_init();
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if (ret < 0)
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goto error_unregister_bus_type;
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return 0;
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error_unregister_bus_type:
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bus_unregister(&iio_bus_type);
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error_nothing:
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return ret;
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}
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static void __exit iio_exit(void)
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{
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iio_dev_exit();
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bus_unregister(&iio_bus_type);
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}
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static ssize_t iio_read_channel_info(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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struct iio_dev *indio_dev = dev_get_drvdata(dev);
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struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
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int val, val2;
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int ret = indio_dev->read_raw(indio_dev, this_attr->c,
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&val, &val2, this_attr->address);
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if (ret < 0)
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return ret;
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if (ret == IIO_VAL_INT)
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return sprintf(buf, "%d\n", val);
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else if (ret == IIO_VAL_INT_PLUS_MICRO) {
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if (val2 < 0)
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return sprintf(buf, "-%d.%06u\n", val, -val2);
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else
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return sprintf(buf, "%d.%06u\n", val, val2);
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} else
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return 0;
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}
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static ssize_t iio_write_channel_info(struct device *dev,
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struct device_attribute *attr,
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const char *buf,
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size_t len)
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{
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struct iio_dev *indio_dev = dev_get_drvdata(dev);
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struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
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int ret, integer = 0, micro = 0, micro_mult = 100000;
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bool integer_part = true, negative = false;
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|
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/* Assumes decimal - precision based on number of digits */
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if (!indio_dev->write_raw)
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return -EINVAL;
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if (buf[0] == '-') {
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negative = true;
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buf++;
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}
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while (*buf) {
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if ('0' <= *buf && *buf <= '9') {
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if (integer_part)
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integer = integer*10 + *buf - '0';
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else {
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micro += micro_mult*(*buf - '0');
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if (micro_mult == 1)
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break;
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micro_mult /= 10;
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}
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} else if (*buf == '\n') {
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if (*(buf + 1) == '\0')
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break;
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else
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return -EINVAL;
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} else if (*buf == '.') {
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integer_part = false;
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} else {
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return -EINVAL;
|
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}
|
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buf++;
|
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}
|
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if (negative) {
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if (integer)
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integer = -integer;
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else
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micro = -micro;
|
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}
|
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|
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ret = indio_dev->write_raw(indio_dev, this_attr->c,
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integer, micro, this_attr->address);
|
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if (ret)
|
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return ret;
|
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|
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return len;
|
|
}
|
|
|
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static int __iio_build_postfix(struct iio_chan_spec const *chan,
|
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bool generic,
|
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const char *postfix,
|
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char **result)
|
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{
|
|
char *all_post;
|
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/* 3 options - generic, extend_name, modified - if generic, extend_name
|
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* and modified cannot apply.*/
|
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|
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if (generic || (!chan->modified && !chan->extend_name)) {
|
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all_post = kasprintf(GFP_KERNEL, "%s", postfix);
|
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} else if (chan->modified) {
|
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const char *intermediate;
|
|
switch (chan->type) {
|
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case IIO_INTENSITY:
|
|
intermediate
|
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= iio_modifier_names_light[chan->channel2];
|
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break;
|
|
case IIO_ACCEL:
|
|
case IIO_GYRO:
|
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case IIO_MAGN:
|
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case IIO_INCLI:
|
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case IIO_ROT:
|
|
case IIO_ANGL:
|
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intermediate
|
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= iio_modifier_names_axial[chan->channel2];
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break;
|
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default:
|
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return -EINVAL;
|
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}
|
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if (chan->extend_name)
|
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all_post = kasprintf(GFP_KERNEL, "%s_%s_%s",
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intermediate,
|
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chan->extend_name,
|
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postfix);
|
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else
|
|
all_post = kasprintf(GFP_KERNEL, "%s_%s",
|
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intermediate,
|
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postfix);
|
|
} else
|
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all_post = kasprintf(GFP_KERNEL, "%s_%s", chan->extend_name,
|
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postfix);
|
|
if (all_post == NULL)
|
|
return -ENOMEM;
|
|
*result = all_post;
|
|
return 0;
|
|
}
|
|
|
|
int __iio_device_attr_init(struct device_attribute *dev_attr,
|
|
const char *postfix,
|
|
struct iio_chan_spec const *chan,
|
|
ssize_t (*readfunc)(struct device *dev,
|
|
struct device_attribute *attr,
|
|
char *buf),
|
|
ssize_t (*writefunc)(struct device *dev,
|
|
struct device_attribute *attr,
|
|
const char *buf,
|
|
size_t len),
|
|
bool generic)
|
|
{
|
|
int ret;
|
|
char *name_format, *full_postfix;
|
|
sysfs_attr_init(&dev_attr->attr);
|
|
ret = __iio_build_postfix(chan, generic, postfix, &full_postfix);
|
|
if (ret)
|
|
goto error_ret;
|
|
|
|
/* Special case for types that uses both channel numbers in naming */
|
|
if (chan->type == IIO_IN_DIFF && !generic)
|
|
name_format
|
|
= kasprintf(GFP_KERNEL, "%s_%s",
|
|
iio_chan_type_name_spec_complex[chan->type],
|
|
full_postfix);
|
|
else if (generic || !chan->indexed)
|
|
name_format
|
|
= kasprintf(GFP_KERNEL, "%s_%s",
|
|
iio_chan_type_name_spec_shared[chan->type],
|
|
full_postfix);
|
|
else
|
|
name_format
|
|
= kasprintf(GFP_KERNEL, "%s%d_%s",
|
|
iio_chan_type_name_spec_shared[chan->type],
|
|
chan->channel,
|
|
full_postfix);
|
|
|
|
if (name_format == NULL) {
|
|
ret = -ENOMEM;
|
|
goto error_free_full_postfix;
|
|
}
|
|
dev_attr->attr.name = kasprintf(GFP_KERNEL,
|
|
name_format,
|
|
chan->channel,
|
|
chan->channel2);
|
|
if (dev_attr->attr.name == NULL) {
|
|
ret = -ENOMEM;
|
|
goto error_free_name_format;
|
|
}
|
|
|
|
if (readfunc) {
|
|
dev_attr->attr.mode |= S_IRUGO;
|
|
dev_attr->show = readfunc;
|
|
}
|
|
|
|
if (writefunc) {
|
|
dev_attr->attr.mode |= S_IWUSR;
|
|
dev_attr->store = writefunc;
|
|
}
|
|
kfree(name_format);
|
|
kfree(full_postfix);
|
|
|
|
return 0;
|
|
|
|
error_free_name_format:
|
|
kfree(name_format);
|
|
error_free_full_postfix:
|
|
kfree(full_postfix);
|
|
error_ret:
|
|
return ret;
|
|
}
|
|
|
|
void __iio_device_attr_deinit(struct device_attribute *dev_attr)
|
|
{
|
|
kfree(dev_attr->attr.name);
|
|
}
|
|
|
|
int __iio_add_chan_devattr(const char *postfix,
|
|
const char *group,
|
|
struct iio_chan_spec const *chan,
|
|
ssize_t (*readfunc)(struct device *dev,
|
|
struct device_attribute *attr,
|
|
char *buf),
|
|
ssize_t (*writefunc)(struct device *dev,
|
|
struct device_attribute *attr,
|
|
const char *buf,
|
|
size_t len),
|
|
int mask,
|
|
bool generic,
|
|
struct device *dev,
|
|
struct list_head *attr_list)
|
|
{
|
|
int ret;
|
|
struct iio_dev_attr *iio_attr, *t;
|
|
|
|
iio_attr = kzalloc(sizeof *iio_attr, GFP_KERNEL);
|
|
if (iio_attr == NULL) {
|
|
ret = -ENOMEM;
|
|
goto error_ret;
|
|
}
|
|
ret = __iio_device_attr_init(&iio_attr->dev_attr,
|
|
postfix, chan,
|
|
readfunc, writefunc, generic);
|
|
if (ret)
|
|
goto error_iio_dev_attr_free;
|
|
iio_attr->c = chan;
|
|
iio_attr->address = mask;
|
|
list_for_each_entry(t, attr_list, l)
|
|
if (strcmp(t->dev_attr.attr.name,
|
|
iio_attr->dev_attr.attr.name) == 0) {
|
|
if (!generic)
|
|
dev_err(dev, "tried to double register : %s\n",
|
|
t->dev_attr.attr.name);
|
|
ret = -EBUSY;
|
|
goto error_device_attr_deinit;
|
|
}
|
|
|
|
ret = sysfs_add_file_to_group(&dev->kobj,
|
|
&iio_attr->dev_attr.attr, group);
|
|
if (ret < 0)
|
|
goto error_device_attr_deinit;
|
|
|
|
list_add(&iio_attr->l, attr_list);
|
|
|
|
return 0;
|
|
|
|
error_device_attr_deinit:
|
|
__iio_device_attr_deinit(&iio_attr->dev_attr);
|
|
error_iio_dev_attr_free:
|
|
kfree(iio_attr);
|
|
error_ret:
|
|
return ret;
|
|
}
|
|
|
|
static int iio_device_add_channel_sysfs(struct iio_dev *dev_info,
|
|
struct iio_chan_spec const *chan)
|
|
{
|
|
int ret, i;
|
|
|
|
|
|
if (chan->channel < 0)
|
|
return 0;
|
|
if (chan->processed_val)
|
|
ret = __iio_add_chan_devattr("input", NULL, chan,
|
|
&iio_read_channel_info,
|
|
NULL,
|
|
0,
|
|
0,
|
|
&dev_info->dev,
|
|
&dev_info->channel_attr_list);
|
|
else
|
|
ret = __iio_add_chan_devattr("raw", NULL, chan,
|
|
&iio_read_channel_info,
|
|
NULL,
|
|
0,
|
|
0,
|
|
&dev_info->dev,
|
|
&dev_info->channel_attr_list);
|
|
if (ret)
|
|
goto error_ret;
|
|
|
|
for_each_set_bit(i, &chan->info_mask, sizeof(long)*8) {
|
|
ret = __iio_add_chan_devattr(iio_chan_info_postfix[i/2],
|
|
NULL, chan,
|
|
&iio_read_channel_info,
|
|
&iio_write_channel_info,
|
|
(1 << i),
|
|
!(i%2),
|
|
&dev_info->dev,
|
|
&dev_info->channel_attr_list);
|
|
if (ret == -EBUSY && (i%2 == 0)) {
|
|
ret = 0;
|
|
continue;
|
|
}
|
|
if (ret < 0)
|
|
goto error_ret;
|
|
}
|
|
error_ret:
|
|
return ret;
|
|
}
|
|
|
|
static void iio_device_remove_and_free_read_attr(struct iio_dev *dev_info,
|
|
struct iio_dev_attr *p)
|
|
{
|
|
sysfs_remove_file_from_group(&dev_info->dev.kobj,
|
|
&p->dev_attr.attr, NULL);
|
|
kfree(p->dev_attr.attr.name);
|
|
kfree(p);
|
|
}
|
|
|
|
static ssize_t iio_show_dev_name(struct device *dev,
|
|
struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct iio_dev *indio_dev = dev_get_drvdata(dev);
|
|
return sprintf(buf, "%s\n", indio_dev->name);
|
|
}
|
|
|
|
static DEVICE_ATTR(name, S_IRUGO, iio_show_dev_name, NULL);
|
|
|
|
static int iio_device_register_sysfs(struct iio_dev *dev_info)
|
|
{
|
|
int i, ret = 0;
|
|
struct iio_dev_attr *p, *n;
|
|
|
|
if (dev_info->attrs) {
|
|
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;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* New channel registration method - relies on the fact a group does
|
|
* not need to be initialized if it is name is NULL.
|
|
*/
|
|
INIT_LIST_HEAD(&dev_info->channel_attr_list);
|
|
if (dev_info->channels)
|
|
for (i = 0; i < dev_info->num_channels; i++) {
|
|
ret = iio_device_add_channel_sysfs(dev_info,
|
|
&dev_info
|
|
->channels[i]);
|
|
if (ret < 0)
|
|
goto error_clear_attrs;
|
|
}
|
|
if (dev_info->name) {
|
|
ret = sysfs_add_file_to_group(&dev_info->dev.kobj,
|
|
&dev_attr_name.attr,
|
|
NULL);
|
|
if (ret)
|
|
goto error_clear_attrs;
|
|
}
|
|
return 0;
|
|
|
|
error_clear_attrs:
|
|
list_for_each_entry_safe(p, n,
|
|
&dev_info->channel_attr_list, l) {
|
|
list_del(&p->l);
|
|
iio_device_remove_and_free_read_attr(dev_info, p);
|
|
}
|
|
if (dev_info->attrs)
|
|
sysfs_remove_group(&dev_info->dev.kobj, dev_info->attrs);
|
|
error_ret:
|
|
return ret;
|
|
|
|
}
|
|
|
|
static void iio_device_unregister_sysfs(struct iio_dev *dev_info)
|
|
{
|
|
|
|
struct iio_dev_attr *p, *n;
|
|
if (dev_info->name)
|
|
sysfs_remove_file_from_group(&dev_info->dev.kobj,
|
|
&dev_attr_name.attr,
|
|
NULL);
|
|
list_for_each_entry_safe(p, n, &dev_info->channel_attr_list, l) {
|
|
list_del(&p->l);
|
|
iio_device_remove_and_free_read_attr(dev_info, p);
|
|
}
|
|
|
|
if (dev_info->attrs)
|
|
sysfs_remove_group(&dev_info->dev.kobj, dev_info->attrs);
|
|
}
|
|
|
|
/* Return a negative errno on failure */
|
|
int iio_get_new_ida_val(struct ida *this_ida)
|
|
{
|
|
int ret;
|
|
int val;
|
|
|
|
ida_again:
|
|
if (unlikely(ida_pre_get(this_ida, GFP_KERNEL) == 0))
|
|
return -ENOMEM;
|
|
|
|
spin_lock(&iio_ida_lock);
|
|
ret = ida_get_new(this_ida, &val);
|
|
spin_unlock(&iio_ida_lock);
|
|
if (unlikely(ret == -EAGAIN))
|
|
goto ida_again;
|
|
else if (unlikely(ret))
|
|
return ret;
|
|
|
|
return val;
|
|
}
|
|
EXPORT_SYMBOL(iio_get_new_ida_val);
|
|
|
|
void iio_free_ida_val(struct ida *this_ida, int id)
|
|
{
|
|
spin_lock(&iio_ida_lock);
|
|
ida_remove(this_ida, id);
|
|
spin_unlock(&iio_ida_lock);
|
|
}
|
|
EXPORT_SYMBOL(iio_free_ida_val);
|
|
|
|
static int iio_device_register_id(struct iio_dev *dev_info,
|
|
struct ida *this_ida)
|
|
{
|
|
dev_info->id = iio_get_new_ida_val(&iio_ida);
|
|
if (dev_info->id < 0)
|
|
return dev_info->id;
|
|
return 0;
|
|
}
|
|
|
|
static void iio_device_unregister_id(struct iio_dev *dev_info)
|
|
{
|
|
iio_free_ida_val(&iio_ida, dev_info->id);
|
|
}
|
|
|
|
static const char * const iio_ev_type_text[] = {
|
|
[IIO_EV_TYPE_THRESH] = "thresh",
|
|
[IIO_EV_TYPE_MAG] = "mag",
|
|
[IIO_EV_TYPE_ROC] = "roc"
|
|
};
|
|
|
|
static const char * const iio_ev_dir_text[] = {
|
|
[IIO_EV_DIR_EITHER] = "either",
|
|
[IIO_EV_DIR_RISING] = "rising",
|
|
[IIO_EV_DIR_FALLING] = "falling"
|
|
};
|
|
|
|
static ssize_t iio_ev_state_store(struct device *dev,
|
|
struct device_attribute *attr,
|
|
const char *buf,
|
|
size_t len)
|
|
{
|
|
struct iio_dev *indio_dev = dev_get_drvdata(dev);
|
|
struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
|
|
int ret;
|
|
unsigned long val;
|
|
ret = strict_strtoul(buf, 10, &val);
|
|
if (ret || val < 0 || val > 1)
|
|
return -EINVAL;
|
|
|
|
ret = indio_dev->write_event_config(indio_dev, this_attr->address,
|
|
val);
|
|
return (ret < 0) ? ret : len;
|
|
}
|
|
|
|
static ssize_t iio_ev_state_show(struct device *dev,
|
|
struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct iio_dev *indio_dev = dev_get_drvdata(dev);
|
|
struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
|
|
int val = indio_dev->read_event_config(indio_dev, this_attr->address);
|
|
|
|
if (val < 0)
|
|
return val;
|
|
else
|
|
return sprintf(buf, "%d\n", val);
|
|
}
|
|
|
|
static ssize_t iio_ev_value_show(struct device *dev,
|
|
struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct iio_dev *indio_dev = dev_get_drvdata(dev);
|
|
struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
|
|
int val, ret;
|
|
|
|
ret = indio_dev->read_event_value(indio_dev,
|
|
this_attr->address, &val);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
return sprintf(buf, "%d\n", val);
|
|
}
|
|
|
|
static ssize_t iio_ev_value_store(struct device *dev,
|
|
struct device_attribute *attr,
|
|
const char *buf,
|
|
size_t len)
|
|
{
|
|
struct iio_dev *indio_dev = dev_get_drvdata(dev);
|
|
struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
|
|
unsigned long val;
|
|
int ret;
|
|
|
|
ret = strict_strtoul(buf, 10, &val);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = indio_dev->write_event_value(indio_dev, this_attr->address,
|
|
val);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
return len;
|
|
}
|
|
|
|
static int iio_device_add_event_sysfs(struct iio_dev *dev_info,
|
|
struct iio_chan_spec const *chan)
|
|
{
|
|
|
|
int ret = 0, i, mask;
|
|
char *postfix;
|
|
if (!chan->event_mask)
|
|
return 0;
|
|
|
|
for_each_set_bit(i, &chan->event_mask, sizeof(chan->event_mask)*8) {
|
|
postfix = kasprintf(GFP_KERNEL, "%s_%s_en",
|
|
iio_ev_type_text[i/IIO_EV_TYPE_MAX],
|
|
iio_ev_dir_text[i%IIO_EV_TYPE_MAX]);
|
|
if (postfix == NULL) {
|
|
ret = -ENOMEM;
|
|
goto error_ret;
|
|
}
|
|
switch (chan->type) {
|
|
/* Switch this to a table at some point */
|
|
case IIO_IN:
|
|
mask = IIO_UNMOD_EVENT_CODE(chan->type, chan->channel,
|
|
i/IIO_EV_TYPE_MAX,
|
|
i%IIO_EV_TYPE_MAX);
|
|
break;
|
|
case IIO_ACCEL:
|
|
mask = IIO_MOD_EVENT_CODE(chan->type, 0, chan->channel,
|
|
i/IIO_EV_TYPE_MAX,
|
|
i%IIO_EV_TYPE_MAX);
|
|
break;
|
|
case IIO_IN_DIFF:
|
|
mask = IIO_MOD_EVENT_CODE(chan->type, chan->channel,
|
|
chan->channel2,
|
|
i/IIO_EV_TYPE_MAX,
|
|
i%IIO_EV_TYPE_MAX);
|
|
break;
|
|
default:
|
|
printk(KERN_INFO "currently unhandled type of event\n");
|
|
}
|
|
ret = __iio_add_chan_devattr(postfix,
|
|
NULL,
|
|
chan,
|
|
&iio_ev_state_show,
|
|
iio_ev_state_store,
|
|
mask,
|
|
/*HACK. - limits us to one
|
|
event interface - fix by
|
|
extending the bitmask - but
|
|
how far*/
|
|
0,
|
|
&dev_info->event_interfaces[0]
|
|
.dev,
|
|
&dev_info->event_interfaces[0].
|
|
dev_attr_list);
|
|
kfree(postfix);
|
|
if (ret)
|
|
goto error_ret;
|
|
|
|
postfix = kasprintf(GFP_KERNEL, "%s_%s_value",
|
|
iio_ev_type_text[i/IIO_EV_TYPE_MAX],
|
|
iio_ev_dir_text[i%IIO_EV_TYPE_MAX]);
|
|
if (postfix == NULL) {
|
|
ret = -ENOMEM;
|
|
goto error_ret;
|
|
}
|
|
ret = __iio_add_chan_devattr(postfix, NULL, chan,
|
|
iio_ev_value_show,
|
|
iio_ev_value_store,
|
|
mask,
|
|
0,
|
|
&dev_info->event_interfaces[0]
|
|
.dev,
|
|
&dev_info->event_interfaces[0]
|
|
.dev_attr_list);
|
|
kfree(postfix);
|
|
if (ret)
|
|
goto error_ret;
|
|
|
|
}
|
|
|
|
error_ret:
|
|
return ret;
|
|
}
|
|
|
|
static inline void __iio_remove_all_event_sysfs(struct iio_dev *dev_info,
|
|
const char *groupname,
|
|
int num)
|
|
{
|
|
struct iio_dev_attr *p, *n;
|
|
list_for_each_entry_safe(p, n,
|
|
&dev_info->event_interfaces[num].
|
|
dev_attr_list, l) {
|
|
sysfs_remove_file_from_group(&dev_info
|
|
->event_interfaces[num].dev.kobj,
|
|
&p->dev_attr.attr,
|
|
groupname);
|
|
kfree(p->dev_attr.attr.name);
|
|
kfree(p);
|
|
}
|
|
}
|
|
|
|
static inline int __iio_add_event_config_attrs(struct iio_dev *dev_info, int i)
|
|
{
|
|
int j;
|
|
int ret;
|
|
INIT_LIST_HEAD(&dev_info->event_interfaces[0].dev_attr_list);
|
|
/* Dynically created from the channels array */
|
|
if (dev_info->channels) {
|
|
for (j = 0; j < dev_info->num_channels; j++) {
|
|
ret = iio_device_add_event_sysfs(dev_info,
|
|
&dev_info
|
|
->channels[j]);
|
|
if (ret)
|
|
goto error_clear_attrs;
|
|
}
|
|
}
|
|
return 0;
|
|
|
|
error_clear_attrs:
|
|
__iio_remove_all_event_sysfs(dev_info, NULL, i);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static inline int __iio_remove_event_config_attrs(struct iio_dev *dev_info,
|
|
int i)
|
|
{
|
|
__iio_remove_all_event_sysfs(dev_info, NULL, i);
|
|
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;
|
|
}
|
|
|
|
for (i = 0; i < dev_info->num_interrupt_lines; i++) {
|
|
snprintf(dev_info->event_interfaces[i]._name, 20,
|
|
"%s:event%d",
|
|
dev_name(&dev_info->dev),
|
|
i);
|
|
|
|
ret = iio_setup_ev_int(&dev_info->event_interfaces[i],
|
|
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");
|
|
goto error_free_setup_ev_ints;
|
|
}
|
|
|
|
dev_set_drvdata(&dev_info->event_interfaces[i].dev,
|
|
(void *)dev_info);
|
|
|
|
if (dev_info->event_attrs != NULL)
|
|
ret = sysfs_create_group(&dev_info
|
|
->event_interfaces[i]
|
|
.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++)
|
|
if (dev_info->event_attrs != NULL)
|
|
sysfs_remove_group(&dev_info
|
|
->event_interfaces[j].dev.kobj,
|
|
&dev_info->event_attrs[j]);
|
|
error_free_setup_ev_ints:
|
|
for (j = 0; j < i; j++)
|
|
iio_free_ev_int(&dev_info->event_interfaces[j]);
|
|
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++) {
|
|
__iio_remove_event_config_attrs(dev_info, i);
|
|
if (dev_info->event_attrs != NULL)
|
|
sysfs_remove_group(&dev_info
|
|
->event_interfaces[i].dev.kobj,
|
|
&dev_info->event_attrs[i]);
|
|
}
|
|
|
|
for (i = 0; i < dev_info->num_interrupt_lines; i++)
|
|
iio_free_ev_int(&dev_info->event_interfaces[i]);
|
|
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(int sizeof_priv)
|
|
{
|
|
struct iio_dev *dev;
|
|
size_t alloc_size;
|
|
|
|
alloc_size = sizeof(struct iio_dev);
|
|
if (sizeof_priv) {
|
|
alloc_size = ALIGN(alloc_size, IIO_ALIGN);
|
|
alloc_size += sizeof_priv;
|
|
}
|
|
/* ensure 32-byte alignment of whole construct ? */
|
|
alloc_size += IIO_ALIGN - 1;
|
|
|
|
dev = kzalloc(alloc_size, GFP_KERNEL);
|
|
|
|
if (dev) {
|
|
dev->dev.type = &iio_dev_type;
|
|
dev->dev.bus = &iio_bus_type;
|
|
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_ida);
|
|
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_ida;
|
|
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_ida:
|
|
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");
|