#
obj-$(CONFIG_IIO) += industrialio.o
-industrialio-y := industrialio-core.o
+industrialio-y := industrialio-core.o industrialio-event.o
industrialio-$(CONFIG_IIO_BUFFER) += industrialio-buffer.o
industrialio-$(CONFIG_IIO_TRIGGER) += industrialio-trigger.o
#endif
+int iio_device_register_eventset(struct iio_dev *indio_dev);
+void iio_device_unregister_eventset(struct iio_dev *indio_dev);
+int iio_event_getfd(struct iio_dev *indio_dev);
+
#endif
return NULL;
}
-/**
- * struct iio_detected_event_list - list element for events that have occurred
- * @list: linked list header
- * @ev: the event itself
- */
-struct iio_detected_event_list {
- struct list_head list;
- struct iio_event_data ev;
-};
-
-/**
- * struct iio_event_interface - chrdev interface for an event line
- * @wait: wait queue to allow blocking reads of events
- * @event_list_lock: mutex to protect the list of detected events
- * @det_events: list of detected events
- * @max_events: maximum number of events before new ones are dropped
- * @current_events: number of events in detected list
- * @dev_attr_list: list of event interface sysfs attribute
- * @flags: file operations related flags including busy flag.
- * @group: event interface sysfs attribute group
- */
-struct iio_event_interface {
- wait_queue_head_t wait;
- struct mutex event_list_lock;
- struct list_head det_events;
- int max_events;
- int current_events;
- struct list_head dev_attr_list;
- unsigned long flags;
- struct attribute_group group;
-};
-
-int iio_push_event(struct iio_dev *indio_dev, u64 ev_code, s64 timestamp)
-{
- struct iio_event_interface *ev_int = indio_dev->event_interface;
- struct iio_detected_event_list *ev;
- int ret = 0;
-
- /* Does anyone care? */
- mutex_lock(&ev_int->event_list_lock);
- if (test_bit(IIO_BUSY_BIT_POS, &ev_int->flags)) {
- if (ev_int->current_events == ev_int->max_events) {
- mutex_unlock(&ev_int->event_list_lock);
- return 0;
- }
- ev = kmalloc(sizeof(*ev), GFP_KERNEL);
- if (ev == NULL) {
- ret = -ENOMEM;
- mutex_unlock(&ev_int->event_list_lock);
- goto error_ret;
- }
- ev->ev.id = ev_code;
- ev->ev.timestamp = timestamp;
-
- list_add_tail(&ev->list, &ev_int->det_events);
- ev_int->current_events++;
- mutex_unlock(&ev_int->event_list_lock);
- wake_up_interruptible(&ev_int->wait);
- } else
- mutex_unlock(&ev_int->event_list_lock);
-
-error_ret:
- return ret;
-}
-EXPORT_SYMBOL(iio_push_event);
-
/* This turns up an awful lot */
ssize_t iio_read_const_attr(struct device *dev,
struct device_attribute *attr,
}
EXPORT_SYMBOL(iio_read_const_attr);
-static ssize_t iio_event_chrdev_read(struct file *filep,
- char __user *buf,
- size_t count,
- loff_t *f_ps)
-{
- struct iio_event_interface *ev_int = filep->private_data;
- struct iio_detected_event_list *el;
- size_t len = sizeof(el->ev);
- int ret;
-
- if (count < len)
- return -EINVAL;
-
- mutex_lock(&ev_int->event_list_lock);
- if (list_empty(&ev_int->det_events)) {
- if (filep->f_flags & O_NONBLOCK) {
- ret = -EAGAIN;
- goto error_mutex_unlock;
- }
- mutex_unlock(&ev_int->event_list_lock);
- /* Blocking on device; waiting for something to be there */
- ret = wait_event_interruptible(ev_int->wait,
- !list_empty(&ev_int
- ->det_events));
- if (ret)
- goto error_ret;
- /* Single access device so no one else can get the data */
- mutex_lock(&ev_int->event_list_lock);
- }
-
- el = list_first_entry(&ev_int->det_events,
- struct iio_detected_event_list,
- list);
- if (copy_to_user(buf, &(el->ev), len)) {
- ret = -EFAULT;
- goto error_mutex_unlock;
- }
- list_del(&el->list);
- ev_int->current_events--;
- mutex_unlock(&ev_int->event_list_lock);
- kfree(el);
-
- return len;
-
-error_mutex_unlock:
- mutex_unlock(&ev_int->event_list_lock);
-error_ret:
-
- return ret;
-}
-
-static int iio_event_chrdev_release(struct inode *inode, struct file *filep)
-{
- struct iio_event_interface *ev_int = filep->private_data;
- struct iio_detected_event_list *el, *t;
-
- mutex_lock(&ev_int->event_list_lock);
- clear_bit(IIO_BUSY_BIT_POS, &ev_int->flags);
- /*
- * In order to maintain a clean state for reopening,
- * clear out any awaiting events. The mask will prevent
- * any new __iio_push_event calls running.
- */
- list_for_each_entry_safe(el, t, &ev_int->det_events, list) {
- list_del(&el->list);
- kfree(el);
- }
- ev_int->current_events = 0;
- mutex_unlock(&ev_int->event_list_lock);
-
- return 0;
-}
-
-static const struct file_operations iio_event_chrdev_fileops = {
- .read = iio_event_chrdev_read,
- .release = iio_event_chrdev_release,
- .owner = THIS_MODULE,
- .llseek = noop_llseek,
-};
-
-static int iio_event_getfd(struct iio_dev *indio_dev)
-{
- struct iio_event_interface *ev_int = indio_dev->event_interface;
- int fd;
-
- if (ev_int == NULL)
- return -ENODEV;
-
- mutex_lock(&ev_int->event_list_lock);
- if (test_and_set_bit(IIO_BUSY_BIT_POS, &ev_int->flags)) {
- mutex_unlock(&ev_int->event_list_lock);
- return -EBUSY;
- }
- mutex_unlock(&ev_int->event_list_lock);
- fd = anon_inode_getfd("iio:event",
- &iio_event_chrdev_fileops, ev_int, O_RDONLY);
- if (fd < 0) {
- mutex_lock(&ev_int->event_list_lock);
- clear_bit(IIO_BUSY_BIT_POS, &ev_int->flags);
- mutex_unlock(&ev_int->event_list_lock);
- }
- return fd;
-}
-
static int __init iio_init(void)
{
int ret;
kfree(indio_dev->chan_attr_group.attrs);
}
-static const char * const iio_ev_type_text[] = {
- [IIO_EV_TYPE_THRESH] = "thresh",
- [IIO_EV_TYPE_MAG] = "mag",
- [IIO_EV_TYPE_ROC] = "roc",
- [IIO_EV_TYPE_THRESH_ADAPTIVE] = "thresh_adaptive",
- [IIO_EV_TYPE_MAG_ADAPTIVE] = "mag_adaptive",
-};
-
-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;
- bool val;
-
- ret = strtobool(buf, &val);
- if (ret < 0)
- return ret;
-
- ret = indio_dev->info->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->info->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->info->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;
-
- if (!indio_dev->info->write_event_value)
- return -EINVAL;
-
- ret = strict_strtoul(buf, 10, &val);
- if (ret)
- return ret;
-
- ret = indio_dev->info->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 *indio_dev,
- struct iio_chan_spec const *chan)
-{
- int ret = 0, i, attrcount = 0;
- u64 mask = 0;
- 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_DIR_MAX],
- iio_ev_dir_text[i%IIO_EV_DIR_MAX]);
- if (postfix == NULL) {
- ret = -ENOMEM;
- goto error_ret;
- }
- if (chan->modified)
- mask = IIO_MOD_EVENT_CODE(chan->type, 0, chan->channel,
- i/IIO_EV_DIR_MAX,
- i%IIO_EV_DIR_MAX);
- else if (chan->differential)
- mask = IIO_EVENT_CODE(chan->type,
- 0, 0,
- i%IIO_EV_DIR_MAX,
- i/IIO_EV_DIR_MAX,
- 0,
- chan->channel,
- chan->channel2);
- else
- mask = IIO_UNMOD_EVENT_CODE(chan->type,
- chan->channel,
- i/IIO_EV_DIR_MAX,
- i%IIO_EV_DIR_MAX);
-
- ret = __iio_add_chan_devattr(postfix,
- chan,
- &iio_ev_state_show,
- iio_ev_state_store,
- mask,
- 0,
- &indio_dev->dev,
- &indio_dev->event_interface->
- dev_attr_list);
- kfree(postfix);
- if (ret)
- goto error_ret;
- attrcount++;
- postfix = kasprintf(GFP_KERNEL, "%s_%s_value",
- iio_ev_type_text[i/IIO_EV_DIR_MAX],
- iio_ev_dir_text[i%IIO_EV_DIR_MAX]);
- if (postfix == NULL) {
- ret = -ENOMEM;
- goto error_ret;
- }
- ret = __iio_add_chan_devattr(postfix, chan,
- iio_ev_value_show,
- iio_ev_value_store,
- mask,
- 0,
- &indio_dev->dev,
- &indio_dev->event_interface->
- dev_attr_list);
- kfree(postfix);
- if (ret)
- goto error_ret;
- attrcount++;
- }
- ret = attrcount;
-error_ret:
- return ret;
-}
-
-static inline void __iio_remove_event_config_attrs(struct iio_dev *indio_dev)
-{
- struct iio_dev_attr *p, *n;
- list_for_each_entry_safe(p, n,
- &indio_dev->event_interface->
- dev_attr_list, l) {
- kfree(p->dev_attr.attr.name);
- kfree(p);
- }
-}
-
-static inline int __iio_add_event_config_attrs(struct iio_dev *indio_dev)
-{
- int j, ret, attrcount = 0;
-
- INIT_LIST_HEAD(&indio_dev->event_interface->dev_attr_list);
- /* Dynically created from the channels array */
- for (j = 0; j < indio_dev->num_channels; j++) {
- ret = iio_device_add_event_sysfs(indio_dev,
- &indio_dev->channels[j]);
- if (ret < 0)
- goto error_clear_attrs;
- attrcount += ret;
- }
- return attrcount;
-
-error_clear_attrs:
- __iio_remove_event_config_attrs(indio_dev);
-
- return ret;
-}
-
-static bool iio_check_for_dynamic_events(struct iio_dev *indio_dev)
-{
- int j;
-
- for (j = 0; j < indio_dev->num_channels; j++)
- if (indio_dev->channels[j].event_mask != 0)
- return true;
- return false;
-}
-
-static void iio_setup_ev_int(struct iio_event_interface *ev_int)
-{
- 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);
- init_waitqueue_head(&ev_int->wait);
-}
-
-static const char *iio_event_group_name = "events";
-static int iio_device_register_eventset(struct iio_dev *indio_dev)
-{
- struct iio_dev_attr *p;
- int ret = 0, attrcount_orig = 0, attrcount, attrn;
- struct attribute **attr;
-
- if (!(indio_dev->info->event_attrs ||
- iio_check_for_dynamic_events(indio_dev)))
- return 0;
-
- indio_dev->event_interface =
- kzalloc(sizeof(struct iio_event_interface), GFP_KERNEL);
- if (indio_dev->event_interface == NULL) {
- ret = -ENOMEM;
- goto error_ret;
- }
-
- iio_setup_ev_int(indio_dev->event_interface);
- if (indio_dev->info->event_attrs != NULL) {
- attr = indio_dev->info->event_attrs->attrs;
- while (*attr++ != NULL)
- attrcount_orig++;
- }
- attrcount = attrcount_orig;
- if (indio_dev->channels) {
- ret = __iio_add_event_config_attrs(indio_dev);
- if (ret < 0)
- goto error_free_setup_event_lines;
- attrcount += ret;
- }
-
- indio_dev->event_interface->group.name = iio_event_group_name;
- indio_dev->event_interface->group.attrs = kcalloc(attrcount + 1,
- sizeof(indio_dev->event_interface->group.attrs[0]),
- GFP_KERNEL);
- if (indio_dev->event_interface->group.attrs == NULL) {
- ret = -ENOMEM;
- goto error_free_setup_event_lines;
- }
- if (indio_dev->info->event_attrs)
- memcpy(indio_dev->event_interface->group.attrs,
- indio_dev->info->event_attrs->attrs,
- sizeof(indio_dev->event_interface->group.attrs[0])
- *attrcount_orig);
- attrn = attrcount_orig;
- /* Add all elements from the list. */
- list_for_each_entry(p,
- &indio_dev->event_interface->dev_attr_list,
- l)
- indio_dev->event_interface->group.attrs[attrn++] =
- &p->dev_attr.attr;
- indio_dev->groups[indio_dev->groupcounter++] =
- &indio_dev->event_interface->group;
-
- return 0;
-
-error_free_setup_event_lines:
- __iio_remove_event_config_attrs(indio_dev);
- kfree(indio_dev->event_interface);
-error_ret:
-
- return ret;
-}
-
-static void iio_device_unregister_eventset(struct iio_dev *indio_dev)
-{
- if (indio_dev->event_interface == NULL)
- return;
- __iio_remove_event_config_attrs(indio_dev);
- kfree(indio_dev->event_interface->group.attrs);
- kfree(indio_dev->event_interface);
-}
-
static void iio_dev_release(struct device *device)
{
struct iio_dev *indio_dev = container_of(device, struct iio_dev, dev);
--- /dev/null
+/* Industrial I/O event handling
+ *
+ * Copyright (c) 2008 Jonathan Cameron
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published by
+ * the Free Software Foundation.
+ *
+ * Based on elements of hwmon and input subsystems.
+ */
+
+#include <linux/anon_inodes.h>
+#include <linux/device.h>
+#include <linux/fs.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/sched.h>
+#include <linux/slab.h>
+#include <linux/uaccess.h>
+#include <linux/wait.h>
+#include "iio.h"
+#include "iio_core.h"
+#include "sysfs.h"
+#include "events.h"
+
+/**
+ * struct iio_detected_event_list - list element for events that have occurred
+ * @list: linked list header
+ * @ev: the event itself
+ */
+struct iio_detected_event_list {
+ struct list_head list;
+ struct iio_event_data ev;
+};
+
+/**
+ * struct iio_event_interface - chrdev interface for an event line
+ * @wait: wait queue to allow blocking reads of events
+ * @event_list_lock: mutex to protect the list of detected events
+ * @det_events: list of detected events
+ * @max_events: maximum number of events before new ones are dropped
+ * @current_events: number of events in detected list
+ * @dev_attr_list: list of event interface sysfs attribute
+ * @flags: file operations related flags including busy flag.
+ * @group: event interface sysfs attribute group
+ */
+struct iio_event_interface {
+ wait_queue_head_t wait;
+ struct mutex event_list_lock;
+ struct list_head det_events;
+ int max_events;
+ int current_events;
+ struct list_head dev_attr_list;
+ unsigned long flags;
+ struct attribute_group group;
+};
+
+int iio_push_event(struct iio_dev *indio_dev, u64 ev_code, s64 timestamp)
+{
+ struct iio_event_interface *ev_int = indio_dev->event_interface;
+ struct iio_detected_event_list *ev;
+ int ret = 0;
+
+ /* Does anyone care? */
+ mutex_lock(&ev_int->event_list_lock);
+ if (test_bit(IIO_BUSY_BIT_POS, &ev_int->flags)) {
+ if (ev_int->current_events == ev_int->max_events) {
+ mutex_unlock(&ev_int->event_list_lock);
+ return 0;
+ }
+ ev = kmalloc(sizeof(*ev), GFP_KERNEL);
+ if (ev == NULL) {
+ ret = -ENOMEM;
+ mutex_unlock(&ev_int->event_list_lock);
+ goto error_ret;
+ }
+ ev->ev.id = ev_code;
+ ev->ev.timestamp = timestamp;
+
+ list_add_tail(&ev->list, &ev_int->det_events);
+ ev_int->current_events++;
+ mutex_unlock(&ev_int->event_list_lock);
+ wake_up_interruptible(&ev_int->wait);
+ } else
+ mutex_unlock(&ev_int->event_list_lock);
+
+error_ret:
+ return ret;
+}
+EXPORT_SYMBOL(iio_push_event);
+
+static ssize_t iio_event_chrdev_read(struct file *filep,
+ char __user *buf,
+ size_t count,
+ loff_t *f_ps)
+{
+ struct iio_event_interface *ev_int = filep->private_data;
+ struct iio_detected_event_list *el;
+ size_t len = sizeof(el->ev);
+ int ret;
+
+ if (count < len)
+ return -EINVAL;
+
+ mutex_lock(&ev_int->event_list_lock);
+ if (list_empty(&ev_int->det_events)) {
+ if (filep->f_flags & O_NONBLOCK) {
+ ret = -EAGAIN;
+ goto error_mutex_unlock;
+ }
+ mutex_unlock(&ev_int->event_list_lock);
+ /* Blocking on device; waiting for something to be there */
+ ret = wait_event_interruptible(ev_int->wait,
+ !list_empty(&ev_int
+ ->det_events));
+ if (ret)
+ goto error_ret;
+ /* Single access device so no one else can get the data */
+ mutex_lock(&ev_int->event_list_lock);
+ }
+
+ el = list_first_entry(&ev_int->det_events,
+ struct iio_detected_event_list,
+ list);
+ if (copy_to_user(buf, &(el->ev), len)) {
+ ret = -EFAULT;
+ goto error_mutex_unlock;
+ }
+ list_del(&el->list);
+ ev_int->current_events--;
+ mutex_unlock(&ev_int->event_list_lock);
+ kfree(el);
+
+ return len;
+
+error_mutex_unlock:
+ mutex_unlock(&ev_int->event_list_lock);
+error_ret:
+
+ return ret;
+}
+
+static int iio_event_chrdev_release(struct inode *inode, struct file *filep)
+{
+ struct iio_event_interface *ev_int = filep->private_data;
+ struct iio_detected_event_list *el, *t;
+
+ mutex_lock(&ev_int->event_list_lock);
+ clear_bit(IIO_BUSY_BIT_POS, &ev_int->flags);
+ /*
+ * In order to maintain a clean state for reopening,
+ * clear out any awaiting events. The mask will prevent
+ * any new __iio_push_event calls running.
+ */
+ list_for_each_entry_safe(el, t, &ev_int->det_events, list) {
+ list_del(&el->list);
+ kfree(el);
+ }
+ ev_int->current_events = 0;
+ mutex_unlock(&ev_int->event_list_lock);
+
+ return 0;
+}
+
+static const struct file_operations iio_event_chrdev_fileops = {
+ .read = iio_event_chrdev_read,
+ .release = iio_event_chrdev_release,
+ .owner = THIS_MODULE,
+ .llseek = noop_llseek,
+};
+
+int iio_event_getfd(struct iio_dev *indio_dev)
+{
+ struct iio_event_interface *ev_int = indio_dev->event_interface;
+ int fd;
+
+ if (ev_int == NULL)
+ return -ENODEV;
+
+ mutex_lock(&ev_int->event_list_lock);
+ if (test_and_set_bit(IIO_BUSY_BIT_POS, &ev_int->flags)) {
+ mutex_unlock(&ev_int->event_list_lock);
+ return -EBUSY;
+ }
+ mutex_unlock(&ev_int->event_list_lock);
+ fd = anon_inode_getfd("iio:event",
+ &iio_event_chrdev_fileops, ev_int, O_RDONLY);
+ if (fd < 0) {
+ mutex_lock(&ev_int->event_list_lock);
+ clear_bit(IIO_BUSY_BIT_POS, &ev_int->flags);
+ mutex_unlock(&ev_int->event_list_lock);
+ }
+ return fd;
+}
+
+static const char * const iio_ev_type_text[] = {
+ [IIO_EV_TYPE_THRESH] = "thresh",
+ [IIO_EV_TYPE_MAG] = "mag",
+ [IIO_EV_TYPE_ROC] = "roc",
+ [IIO_EV_TYPE_THRESH_ADAPTIVE] = "thresh_adaptive",
+ [IIO_EV_TYPE_MAG_ADAPTIVE] = "mag_adaptive",
+};
+
+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;
+ bool val;
+
+ ret = strtobool(buf, &val);
+ if (ret < 0)
+ return ret;
+
+ ret = indio_dev->info->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->info->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->info->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;
+
+ if (!indio_dev->info->write_event_value)
+ return -EINVAL;
+
+ ret = strict_strtoul(buf, 10, &val);
+ if (ret)
+ return ret;
+
+ ret = indio_dev->info->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 *indio_dev,
+ struct iio_chan_spec const *chan)
+{
+ int ret = 0, i, attrcount = 0;
+ u64 mask = 0;
+ 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_DIR_MAX],
+ iio_ev_dir_text[i%IIO_EV_DIR_MAX]);
+ if (postfix == NULL) {
+ ret = -ENOMEM;
+ goto error_ret;
+ }
+ if (chan->modified)
+ mask = IIO_MOD_EVENT_CODE(chan->type, 0, chan->channel,
+ i/IIO_EV_DIR_MAX,
+ i%IIO_EV_DIR_MAX);
+ else if (chan->differential)
+ mask = IIO_EVENT_CODE(chan->type,
+ 0, 0,
+ i%IIO_EV_DIR_MAX,
+ i/IIO_EV_DIR_MAX,
+ 0,
+ chan->channel,
+ chan->channel2);
+ else
+ mask = IIO_UNMOD_EVENT_CODE(chan->type,
+ chan->channel,
+ i/IIO_EV_DIR_MAX,
+ i%IIO_EV_DIR_MAX);
+
+ ret = __iio_add_chan_devattr(postfix,
+ chan,
+ &iio_ev_state_show,
+ iio_ev_state_store,
+ mask,
+ 0,
+ &indio_dev->dev,
+ &indio_dev->event_interface->
+ dev_attr_list);
+ kfree(postfix);
+ if (ret)
+ goto error_ret;
+ attrcount++;
+ postfix = kasprintf(GFP_KERNEL, "%s_%s_value",
+ iio_ev_type_text[i/IIO_EV_DIR_MAX],
+ iio_ev_dir_text[i%IIO_EV_DIR_MAX]);
+ if (postfix == NULL) {
+ ret = -ENOMEM;
+ goto error_ret;
+ }
+ ret = __iio_add_chan_devattr(postfix, chan,
+ iio_ev_value_show,
+ iio_ev_value_store,
+ mask,
+ 0,
+ &indio_dev->dev,
+ &indio_dev->event_interface->
+ dev_attr_list);
+ kfree(postfix);
+ if (ret)
+ goto error_ret;
+ attrcount++;
+ }
+ ret = attrcount;
+error_ret:
+ return ret;
+}
+
+static inline void __iio_remove_event_config_attrs(struct iio_dev *indio_dev)
+{
+ struct iio_dev_attr *p, *n;
+ list_for_each_entry_safe(p, n,
+ &indio_dev->event_interface->
+ dev_attr_list, l) {
+ kfree(p->dev_attr.attr.name);
+ kfree(p);
+ }
+}
+
+static inline int __iio_add_event_config_attrs(struct iio_dev *indio_dev)
+{
+ int j, ret, attrcount = 0;
+
+ INIT_LIST_HEAD(&indio_dev->event_interface->dev_attr_list);
+ /* Dynically created from the channels array */
+ for (j = 0; j < indio_dev->num_channels; j++) {
+ ret = iio_device_add_event_sysfs(indio_dev,
+ &indio_dev->channels[j]);
+ if (ret < 0)
+ goto error_clear_attrs;
+ attrcount += ret;
+ }
+ return attrcount;
+
+error_clear_attrs:
+ __iio_remove_event_config_attrs(indio_dev);
+
+ return ret;
+}
+
+static bool iio_check_for_dynamic_events(struct iio_dev *indio_dev)
+{
+ int j;
+
+ for (j = 0; j < indio_dev->num_channels; j++)
+ if (indio_dev->channels[j].event_mask != 0)
+ return true;
+ return false;
+}
+
+static void iio_setup_ev_int(struct iio_event_interface *ev_int)
+{
+ 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);
+ init_waitqueue_head(&ev_int->wait);
+}
+
+static const char *iio_event_group_name = "events";
+int iio_device_register_eventset(struct iio_dev *indio_dev)
+{
+ struct iio_dev_attr *p;
+ int ret = 0, attrcount_orig = 0, attrcount, attrn;
+ struct attribute **attr;
+
+ if (!(indio_dev->info->event_attrs ||
+ iio_check_for_dynamic_events(indio_dev)))
+ return 0;
+
+ indio_dev->event_interface =
+ kzalloc(sizeof(struct iio_event_interface), GFP_KERNEL);
+ if (indio_dev->event_interface == NULL) {
+ ret = -ENOMEM;
+ goto error_ret;
+ }
+
+ iio_setup_ev_int(indio_dev->event_interface);
+ if (indio_dev->info->event_attrs != NULL) {
+ attr = indio_dev->info->event_attrs->attrs;
+ while (*attr++ != NULL)
+ attrcount_orig++;
+ }
+ attrcount = attrcount_orig;
+ if (indio_dev->channels) {
+ ret = __iio_add_event_config_attrs(indio_dev);
+ if (ret < 0)
+ goto error_free_setup_event_lines;
+ attrcount += ret;
+ }
+
+ indio_dev->event_interface->group.name = iio_event_group_name;
+ indio_dev->event_interface->group.attrs = kcalloc(attrcount + 1,
+ sizeof(indio_dev->event_interface->group.attrs[0]),
+ GFP_KERNEL);
+ if (indio_dev->event_interface->group.attrs == NULL) {
+ ret = -ENOMEM;
+ goto error_free_setup_event_lines;
+ }
+ if (indio_dev->info->event_attrs)
+ memcpy(indio_dev->event_interface->group.attrs,
+ indio_dev->info->event_attrs->attrs,
+ sizeof(indio_dev->event_interface->group.attrs[0])
+ *attrcount_orig);
+ attrn = attrcount_orig;
+ /* Add all elements from the list. */
+ list_for_each_entry(p,
+ &indio_dev->event_interface->dev_attr_list,
+ l)
+ indio_dev->event_interface->group.attrs[attrn++] =
+ &p->dev_attr.attr;
+ indio_dev->groups[indio_dev->groupcounter++] =
+ &indio_dev->event_interface->group;
+
+ return 0;
+
+error_free_setup_event_lines:
+ __iio_remove_event_config_attrs(indio_dev);
+ kfree(indio_dev->event_interface);
+error_ret:
+
+ return ret;
+}
+
+void iio_device_unregister_eventset(struct iio_dev *indio_dev)
+{
+ if (indio_dev->event_interface == NULL)
+ return;
+ __iio_remove_event_config_attrs(indio_dev);
+ kfree(indio_dev->event_interface->group.attrs);
+ kfree(indio_dev->event_interface);
+}
projects / kernel / kernel-generic.git / commitdiff