1 files changed, 675 insertions, 268 deletions

diff --git a/drivers/staging/iio/industrialio-core.c b/drivers/staging/iio/industrialio-core.c
index 1795ee1e8207..94d3bfaa061d 100644
--- a/drivers/staging/iio/industrialio-core.c
+++ b/drivers/staging/iio/industrialio-core.c
@@ -16,7 +16,6 @@
 #include <linux/err.h>
 #include <linux/device.h>
 #include <linux/fs.h>
-#include <linux/interrupt.h>
 #include <linux/poll.h>
 #include <linux/sched.h>
 #include <linux/wait.h>
@@ -44,27 +43,55 @@ struct bus_type iio_bus_type = {
 };
 EXPORT_SYMBOL(iio_bus_type);
 
-void __iio_change_event(struct iio_detected_event_list *ev,
-			int ev_code,
-			s64 timestamp)
-{
-	ev->ev.id = ev_code;
-	ev->ev.timestamp = timestamp;
-}
-EXPORT_SYMBOL(__iio_change_event);
+static const char * const iio_chan_type_name_spec_shared[] = {
+	[IIO_TIMESTAMP] = "timestamp",
+	[IIO_ACCEL] = "accel",
+	[IIO_IN] = "in",
+	[IIO_CURRENT] = "current",
+	[IIO_POWER] = "power",
+	[IIO_IN_DIFF] = "in-in",
+	[IIO_GYRO] = "gyro",
+	[IIO_TEMP] = "temp",
+	[IIO_MAGN] = "magn",
+	[IIO_INCLI] = "incli",
+	[IIO_ROT] = "rot",
+	[IIO_INTENSITY] = "intensity",
+	[IIO_LIGHT] = "illuminance",
+	[IIO_ANGL] = "angl",
+};
+
+static const char * const iio_chan_type_name_spec_complex[] = {
+	[IIO_IN_DIFF] = "in%d-in%d",
+};
 
-/* Used both in the interrupt line put events and the ring buffer ones */
+static const char * const iio_modifier_names_light[] = {
+	[IIO_MOD_LIGHT_BOTH] = "both",
+	[IIO_MOD_LIGHT_IR] = "ir",
+};
 
-/* Note that in it's current form someone has to be listening before events
- * are queued. Hence a client MUST open the chrdev before the ring buffer is
- * switched on.
- */
-int __iio_push_event(struct iio_event_interface *ev_int,
-		     int ev_code,
-		     s64 timestamp,
-		     struct iio_shared_ev_pointer *
-		     shared_pointer_p)
+static const char * const iio_modifier_names_axial[] = {
+	[IIO_MOD_X] = "x",
+	[IIO_MOD_Y] = "y",
+	[IIO_MOD_Z] = "z",
+};
+
+/* relies on pairs of these shared then separate */
+static const char * const iio_chan_info_postfix[] = {
+	[IIO_CHAN_INFO_SCALE_SHARED/2] = "scale",
+	[IIO_CHAN_INFO_OFFSET_SHARED/2] = "offset",
+	[IIO_CHAN_INFO_CALIBSCALE_SHARED/2] = "calibscale",
+	[IIO_CHAN_INFO_CALIBBIAS_SHARED/2] = "calibbias",
+	[IIO_CHAN_INFO_PEAK_SHARED/2] = "peak_raw",
+	[IIO_CHAN_INFO_PEAK_SCALE_SHARED/2] = "peak_scale",
+};
+
+int iio_push_event(struct iio_dev *dev_info,
+		   int ev_line,
+		   int ev_code,
+		   s64 timestamp)
 {
+	struct iio_event_interface *ev_int
+		= &dev_info->event_interfaces[ev_line];
 	struct iio_detected_event_list *ev;
 	int ret = 0;
 
@@ -83,11 +110,8 @@ int __iio_push_event(struct iio_event_interface *ev_int,
 		}
 		ev->ev.id = ev_code;
 		ev->ev.timestamp = timestamp;
-		ev->shared_pointer = shared_pointer_p;
-		if (ev->shared_pointer)
-			shared_pointer_p->ev_p = ev;
 
-		list_add_tail(&ev->list, &ev_int->det_events.list);
+		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);
@@ -97,85 +121,8 @@ int __iio_push_event(struct iio_event_interface *ev_int,
 error_ret:
 	return ret;
 }
-EXPORT_SYMBOL(__iio_push_event);
-
-int iio_push_event(struct iio_dev *dev_info,
-		   int ev_line,
-		   int ev_code,
-		   s64 timestamp)
-{
-	return __iio_push_event(&dev_info->event_interfaces[ev_line],
-				ev_code, timestamp, NULL);
-}
 EXPORT_SYMBOL(iio_push_event);
 
-/* Generic interrupt line interrupt handler */
-static irqreturn_t iio_interrupt_handler(int irq, void *_int_info)
-{
-	struct iio_interrupt *int_info = _int_info;
-	struct iio_dev *dev_info = int_info->dev_info;
-	struct iio_event_handler_list *p;
-	s64 time_ns;
-	unsigned long flags;
-
-	spin_lock_irqsave(&int_info->ev_list_lock, flags);
-	if (list_empty(&int_info->ev_list)) {
-		spin_unlock_irqrestore(&int_info->ev_list_lock, flags);
-		return IRQ_NONE;
-	}
-
-	time_ns = iio_get_time_ns();
-	list_for_each_entry(p, &int_info->ev_list, list) {
-		disable_irq_nosync(irq);
-		p->handler(dev_info, 1, time_ns, !(p->refcount > 1));
-	}
-	spin_unlock_irqrestore(&int_info->ev_list_lock, flags);
-
-	return IRQ_HANDLED;
-}
-
-static struct iio_interrupt *iio_allocate_interrupt(void)
-{
-	struct iio_interrupt *i = kmalloc(sizeof *i, GFP_KERNEL);
-	if (i) {
-		spin_lock_init(&i->ev_list_lock);
-		INIT_LIST_HEAD(&i->ev_list);
-	}
-	return i;
-}
-
-/* Confirming the validity of supplied irq is left to drivers.*/
-int iio_register_interrupt_line(unsigned int irq,
-				struct iio_dev *dev_info,
-				int line_number,
-				unsigned long type,
-				const char *name)
-{
-	int ret;
-
-	dev_info->interrupts[line_number] = iio_allocate_interrupt();
-	if (dev_info->interrupts[line_number] == NULL) {
-		ret = -ENOMEM;
-		goto error_ret;
-	}
-	dev_info->interrupts[line_number]->line_number = line_number;
-	dev_info->interrupts[line_number]->irq = irq;
-	dev_info->interrupts[line_number]->dev_info = dev_info;
-
-	/* Possibly only request on demand?
-	 * Can see this may complicate the handling of interrupts.
-	 * However, with this approach we might end up handling lots of
-	 * events no-one cares about.*/
-	ret = request_irq(irq,
-			  &iio_interrupt_handler,
-			  type,
-			  name,
-			  dev_info->interrupts[line_number]);
-
-error_ret:
-	return ret;
-}
-EXPORT_SYMBOL(iio_register_interrupt_line);
 
 /* This turns up an awful lot */
 ssize_t iio_read_const_attr(struct device *dev,
@@ -186,54 +133,6 @@ ssize_t iio_read_const_attr(struct device *dev,
 }
 EXPORT_SYMBOL(iio_read_const_attr);
 
-/* Before this runs the interrupt generator must have been disabled */
-void iio_unregister_interrupt_line(struct iio_dev *dev_info, int line_number)
-{
-	/* make sure the interrupt handlers are all done */
-	flush_scheduled_work();
-	free_irq(dev_info->interrupts[line_number]->irq,
-		 dev_info->interrupts[line_number]);
-	kfree(dev_info->interrupts[line_number]);
-}
-EXPORT_SYMBOL(iio_unregister_interrupt_line);
-
-/* Reference counted add and remove */
-void iio_add_event_to_list(struct iio_event_handler_list *el,
-			  struct list_head *head)
-{
-	unsigned long flags;
-	struct iio_interrupt *inter = to_iio_interrupt(head);
-
-	/* take mutex to protect this element */
-	mutex_lock(&el->exist_lock);
-	if (el->refcount == 0) {
-		/* Take the event list spin lock */
-		spin_lock_irqsave(&inter->ev_list_lock, flags);
-		list_add(&el->list, head);
-		spin_unlock_irqrestore(&inter->ev_list_lock, flags);
-	}
-	el->refcount++;
-	mutex_unlock(&el->exist_lock);
-}
-EXPORT_SYMBOL(iio_add_event_to_list);
-
-void iio_remove_event_from_list(struct iio_event_handler_list *el,
-			       struct list_head *head)
-{
-	unsigned long flags;
-	struct iio_interrupt *inter = to_iio_interrupt(head);
-
-	mutex_lock(&el->exist_lock);
-	el->refcount--;
-	if (el->refcount == 0) {
-		/* Take the event list spin lock */
-		spin_lock_irqsave(&inter->ev_list_lock, flags);
-		list_del_init(&el->list);
-		spin_unlock_irqrestore(&inter->ev_list_lock, flags);
-	}
-	mutex_unlock(&el->exist_lock);
-}
-EXPORT_SYMBOL(iio_remove_event_from_list);
 
 static ssize_t iio_event_chrdev_read(struct file *filep,
 				     char __user *buf,
@@ -246,7 +145,7 @@ static ssize_t iio_event_chrdev_read(struct file *filep,
 	size_t len;
 
 	mutex_lock(&ev_int->event_list_lock);
-	if (list_empty(&ev_int->det_events.list)) {
+	if (list_empty(&ev_int->det_events)) {
 		if (filep->f_flags & O_NONBLOCK) {
 			ret = -EAGAIN;
 			goto error_mutex_unlock;
@@ -255,14 +154,14 @@ static ssize_t iio_event_chrdev_read(struct file *filep,
 		/* Blocking on device; waiting for something to be there */
 		ret = wait_event_interruptible(ev_int->wait,
 					       !list_empty(&ev_int
-							   ->det_events.list));
+							   ->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.list,
+	el = list_first_entry(&ev_int->det_events,
 			      struct iio_detected_event_list,
 			      list);
 	len = sizeof el->ev;
@@ -273,18 +172,6 @@ static ssize_t iio_event_chrdev_read(struct file *filep,
 	list_del(&el->list);
 	ev_int->current_events--;
 	mutex_unlock(&ev_int->event_list_lock);
-	/*
-	 * Possible concurency issue if an update of this event is on its way
-	 * through. May lead to new event being removed whilst the reported
-	 * event was the unescalated event. In typical use case this is not a
-	 * problem as userspace will say read half the buffer due to a 50%
-	 * full event which would make the correct 100% full incorrect anyway.
-	 */
-	if (el->shared_pointer) {
-		spin_lock(&el->shared_pointer->lock);
-		(el->shared_pointer->ev_p) = NULL;
-		spin_unlock(&el->shared_pointer->lock);
-	}
 	kfree(el);
 
 	return len;
@@ -309,7 +196,7 @@ static int iio_event_chrdev_release(struct inode *inode, struct file *filep)
 	 * clear out any awaiting events. The mask will prevent
 	 * any new __iio_push_event calls running.
 	 */
-	list_for_each_entry_safe(el, t, &ev_int->det_events.list, list) {
+	list_for_each_entry_safe(el, t, &ev_int->det_events, list) {
 		list_del(&el->list);
 		kfree(el);
 	}
@@ -381,10 +268,11 @@ void iio_device_free_chrdev_minor(int val)
 	spin_unlock(&iio_ida_lock);
 }
 
-int iio_setup_ev_int(struct iio_event_interface *ev_int,
-		     const char *name,
-		     struct module *owner,
-		     struct device *dev)
+static int iio_setup_ev_int(struct iio_event_interface *ev_int,
+			    const char *dev_name,
+			    int index,
+			    struct module *owner,
+			    struct device *dev)
 {
 	int ret, minor;
 
@@ -399,7 +287,7 @@ int iio_setup_ev_int(struct iio_event_interface *ev_int,
 		goto error_device_put;
 	}
 	ev_int->dev.devt = MKDEV(MAJOR(iio_devt), minor);
-	dev_set_name(&ev_int->dev, "%s", name);
+	dev_set_name(&ev_int->dev, "%s:event%d", dev_name, index);
 
 	ret = device_add(&ev_int->dev);
 	if (ret)
@@ -412,7 +300,7 @@ int iio_setup_ev_int(struct iio_event_interface *ev_int,
 	/* discussion point - make this variable? */
 	ev_int->max_events = 10;
 	ev_int->current_events = 0;
-	INIT_LIST_HEAD(&ev_int->det_events.list);
+	INIT_LIST_HEAD(&ev_int->det_events);
 	init_waitqueue_head(&ev_int->wait);
 	ev_int->handler.private = ev_int;
 	ev_int->handler.flags = 0;
@@ -433,7 +321,7 @@ error_device_put:
 	return ret;
 }
 
-void iio_free_ev_int(struct iio_event_interface *ev_int)
+static void iio_free_ev_int(struct iio_event_interface *ev_int)
 {
 	device_unregister(&ev_int->dev);
 	put_device(&ev_int->dev);
@@ -488,24 +376,397 @@ static void __exit iio_exit(void)
 	bus_unregister(&iio_bus_type);
 }
 
-static int iio_device_register_sysfs(struct iio_dev *dev_info)
+static ssize_t iio_read_channel_info(struct device *dev,
+				     struct device_attribute *attr,
+				     char *buf)
 {
-	int ret = 0;
+	struct iio_dev *indio_dev = dev_get_drvdata(dev);
+	struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
+	int val, val2;
+	int ret = indio_dev->info->read_raw(indio_dev, this_attr->c,
+					    &val, &val2, this_attr->address);
 
-	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");
+	if (ret < 0)
+		return ret;
+
+	if (ret == IIO_VAL_INT)
+		return sprintf(buf, "%d\n", val);
+	else if (ret == IIO_VAL_INT_PLUS_MICRO) {
+		if (val2 < 0)
+			return sprintf(buf, "-%d.%06u\n", val, -val2);
+		else
+			return sprintf(buf, "%d.%06u\n", val, val2);
+	} else
+		return 0;
+}
+
+static ssize_t iio_write_channel_info(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, integer = 0, micro = 0, micro_mult = 100000;
+	bool integer_part = true, negative = false;
+
+	/* Assumes decimal - precision based on number of digits */
+	if (!indio_dev->info->write_raw)
+		return -EINVAL;
+	if (buf[0] == '-') {
+		negative = true;
+		buf++;
+	}
+	while (*buf) {
+		if ('0' <= *buf && *buf <= '9') {
+			if (integer_part)
+				integer = integer*10 + *buf - '0';
+			else {
+				micro += micro_mult*(*buf - '0');
+				if (micro_mult == 1)
+					break;
+				micro_mult /= 10;
+			}
+		} else if (*buf == '\n') {
+			if (*(buf + 1) == '\0')
+				break;
+			else
+				return -EINVAL;
+		} else if (*buf == '.') {
+			integer_part = false;
+		} else {
+			return -EINVAL;
+		}
+		buf++;
+	}
+	if (negative) {
+		if (integer)
+			integer = -integer;
+		else
+			micro = -micro;
+	}
+
+	ret = indio_dev->info->write_raw(indio_dev, this_attr->c,
+					 integer, micro, this_attr->address);
+	if (ret)
+		return ret;
+
+	return len;
+}
+
+static int __iio_build_postfix(struct iio_chan_spec const *chan,
+			       bool generic,
+			       const char *postfix,
+			       char **result)
+{
+	char *all_post;
+	/* 3 options - generic, extend_name, modified - if generic, extend_name
+	* and modified cannot apply.*/
+
+	if (generic || (!chan->modified && !chan->extend_name)) {
+		all_post = kasprintf(GFP_KERNEL, "%s", postfix);
+	} else if (chan->modified) {
+		const char *intermediate;
+		switch (chan->type) {
+		case IIO_INTENSITY:
+			intermediate
+				= iio_modifier_names_light[chan->channel2];
+			break;
+		case IIO_ACCEL:
+		case IIO_GYRO:
+		case IIO_MAGN:
+		case IIO_INCLI:
+		case IIO_ROT:
+		case IIO_ANGL:
+			intermediate
+				= iio_modifier_names_axial[chan->channel2];
+			break;
+		default:
+			return -EINVAL;
+		}
+		if (chan->extend_name)
+			all_post = kasprintf(GFP_KERNEL, "%s_%s_%s",
+					     intermediate,
+					     chan->extend_name,
+					     postfix);
+		else
+			all_post = kasprintf(GFP_KERNEL, "%s_%s",
+					     intermediate,
+					     postfix);
+	} else
+		all_post = kasprintf(GFP_KERNEL, "%s_%s", chan->extend_name,
+				     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->info->attrs) {
+		ret = sysfs_create_group(&dev_info->dev.kobj,
+					 dev_info->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->info->attrs)
+		sysfs_remove_group(&dev_info->dev.kobj, dev_info->info->attrs);
 error_ret:
 	return ret;
+
 }
 
 static void iio_device_unregister_sysfs(struct iio_dev *dev_info)
 {
-	sysfs_remove_group(&dev_info->dev.kobj, dev_info->attrs);
+
+	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->info->attrs)
+		sysfs_remove_group(&dev_info->dev.kobj, dev_info->info->attrs);
 }
 
 /* Return a negative errno on failure */
@@ -538,48 +799,209 @@ void iio_free_ida_val(struct ida *this_ida, int id)
 }
 EXPORT_SYMBOL(iio_free_ida_val);
 
-static int iio_device_register_id(struct iio_dev *dev_info,
-				  struct ida *this_ida)
+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)
 {
-	dev_info->id = iio_get_new_ida_val(&iio_ida);
-	if (dev_info->id < 0)
-		return dev_info->id;
-	return 0;
+	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 void iio_device_unregister_id(struct iio_dev *dev_info)
+static ssize_t iio_ev_state_show(struct device *dev,
+				 struct device_attribute *attr,
+				 char *buf)
 {
-	iio_free_ida_val(&iio_ida, dev_info->id);
+	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;
+
+	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 *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;
-	/*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);
+	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_ret;
-			attrp++;
+				goto error_clear_attrs;
 		}
 	}
 	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++;
-	}
+error_clear_attrs:
+	__iio_remove_all_event_sysfs(dev_info, NULL, i);
 
 	return ret;
 }
@@ -587,20 +1009,7 @@ error_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++;
-		}
-	}
-
+	__iio_remove_all_event_sysfs(dev_info, NULL, i);
 	return 0;
 }
 
@@ -608,39 +1017,23 @@ static int iio_device_register_eventset(struct iio_dev *dev_info)
 {
 	int ret = 0, i, j;
 
-	if (dev_info->num_interrupt_lines == 0)
+	if (dev_info->info->num_interrupt_lines == 0)
 		return 0;
 
 	dev_info->event_interfaces =
 		kzalloc(sizeof(struct iio_event_interface)
-			*dev_info->num_interrupt_lines,
+			*dev_info->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;
-
-		snprintf(dev_info->event_interfaces[i]._name, 20,
-			 "%s:event%d",
-			 dev_name(&dev_info->dev),
-			 i);
-
+	for (i = 0; i < dev_info->info->num_interrupt_lines; i++) {
 		ret = iio_setup_ev_int(&dev_info->event_interfaces[i],
-				       (const char *)(dev_info
-						      ->event_interfaces[i]
-						      ._name),
-				       dev_info->driver_module,
+				       dev_name(&dev_info->dev),
+				       i,
+				       dev_info->info->driver_module,
 				       &dev_info->dev);
 		if (ret) {
 			dev_err(&dev_info->dev,
@@ -650,10 +1043,13 @@ static int iio_device_register_eventset(struct iio_dev *dev_info)
 
 		dev_set_drvdata(&dev_info->event_interfaces[i].dev,
 				(void *)dev_info);
-		ret = sysfs_create_group(&dev_info
-					->event_interfaces[i]
-					.dev.kobj,
-					&dev_info->event_attrs[i]);
+
+		if (dev_info->info->event_attrs != NULL)
+			ret = sysfs_create_group(&dev_info
+						 ->event_interfaces[i]
+						 .dev.kobj,
+						 &dev_info->info
+						 ->event_attrs[i]);
 
 		if (ret) {
 			dev_err(&dev_info->dev,
@@ -662,7 +1058,7 @@ static int iio_device_register_eventset(struct iio_dev *dev_info)
 		}
 	}
 
-	for (i = 0; i < dev_info->num_interrupt_lines; i++) {
+	for (i = 0; i < dev_info->info->num_interrupt_lines; i++) {
 		ret = __iio_add_event_config_attrs(dev_info, i);
 		if (ret)
 			goto error_unregister_config_attrs;
@@ -673,17 +1069,16 @@ static int iio_device_register_eventset(struct iio_dev *dev_info)
 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;
+	i = dev_info->info->num_interrupt_lines - 1;
 error_remove_sysfs_interfaces:
 	for (j = 0; j < i; j++)
-		sysfs_remove_group(&dev_info
+		if (dev_info->info->event_attrs != NULL)
+			sysfs_remove_group(&dev_info
 				   ->event_interfaces[j].dev.kobj,
-				   &dev_info->event_attrs[j]);
+				   &dev_info->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->interrupts);
-error_free_event_interfaces:
 	kfree(dev_info->event_interfaces);
 error_ret:
 
@@ -694,25 +1089,25 @@ static void iio_device_unregister_eventset(struct iio_dev *dev_info)
 {
 	int i;
 
-	if (dev_info->num_interrupt_lines == 0)
+	if (dev_info->info->num_interrupt_lines == 0)
 		return;
-	for (i = 0; i < dev_info->num_interrupt_lines; i++)
-		sysfs_remove_group(&dev_info
-				   ->event_interfaces[i].dev.kobj,
-				   &dev_info->event_attrs[i]);
+	for (i = 0; i < dev_info->info->num_interrupt_lines; i++) {
+		__iio_remove_event_config_attrs(dev_info, i);
+		if (dev_info->info->event_attrs != NULL)
+			sysfs_remove_group(&dev_info
+					   ->event_interfaces[i].dev.kobj,
+					   &dev_info->info->event_attrs[i]);
+	}
 
-	for (i = 0; i < dev_info->num_interrupt_lines; i++)
+	for (i = 0; i < dev_info->info->num_interrupt_lines; i++)
 		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);
+	kfree(to_iio_dev(device));
 }
 
 static struct device_type iio_dev_type = {
@@ -720,9 +1115,20 @@ static struct device_type iio_dev_type = {
 	.release = iio_dev_release,
 };
 
-struct iio_dev *iio_allocate_device(void)
+struct iio_dev *iio_allocate_device(int sizeof_priv)
 {
-	struct iio_dev *dev = kzalloc(sizeof *dev, GFP_KERNEL);
+	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;
@@ -748,8 +1154,9 @@ int iio_device_register(struct iio_dev *dev_info)
 {
 	int ret;
 
-	ret = iio_device_register_id(dev_info, &iio_ida);
-	if (ret) {
+	dev_info->id = iio_get_new_ida_val(&iio_ida);
+	if (dev_info->id < 0) {
+		ret = dev_info->id;
 		dev_err(&dev_info->dev, "Failed to get id\n");
 		goto error_ret;
 	}
@@ -780,7 +1187,7 @@ error_free_sysfs:
 error_del_device:
 	device_del(&dev_info->dev);
 error_free_ida:
-	iio_device_unregister_id(dev_info);
+	iio_free_ida_val(&iio_ida, dev_info->id);
 error_ret:
 	return ret;
 }
@@ -792,7 +1199,7 @@ void iio_device_unregister(struct iio_dev *dev_info)
 		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);
+	iio_free_ida_val(&iio_ida, dev_info->id);
 	device_unregister(&dev_info->dev);
 }
 EXPORT_SYMBOL(iio_device_unregister);