Merge tag 'staging-3.11-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging

Pull staging tree update from Greg KH:
 "Here's the large staging tree merge for 3.11-rc1

  Huge thing here is the Lustre client code.  Unfortunatly, due to it
  not building properly on a wide variety of different architectures
  (this was production code???), it is currently disabled from the build
  so as to not annoy people.

  Other than Lustre, there are loads of comedi patches, working to clean
  up that subsystem, iio updates and new drivers, and a load of cleanups
  from the OPW applicants in their quest to get a summer internship.

  All of these have been in the linux-next releases for a while (hence
  the Lustre code being disabled)"

Fixed up trivial conflict in drivers/staging/serqt_usb2/serqt_usb2.c due
to independent renamings in the staging driver cleanup and the USB
tree..

* tag 'staging-3.11-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging: (868 commits)
  Revert "Revert "Revert "staging/lustre: drop CONFIG_BROKEN dependency"""
  staging: rtl8192u: fix line length in r819xU_phy.h
  staging: rtl8192u: rename variables in r819xU_phy.h
  staging: rtl8192u: fix comments in r819xU_phy.h
  staging: rtl8192u: fix whitespace in r819xU_phy.h
  staging: rtl8192u: fix newlines in r819xU_phy.c
  staging: comedi: unioxx5: use comedi_alloc_spriv()
  staging: comedi: unioxx5: fix unioxx5_detach()
  silicom: checkpatch: errors caused by macros
  Staging: silicom: remove the board_t typedef in bpctl_mod.c
  Staging: silicom: capitalize labels in the bp_media_type enum
  Staging: silicom: remove bp_media_type enum typedef
  staging: rtl8192u: replace msleep(1) with usleep_range() in r819xU_phy.c
  staging: rtl8192u: rename dwRegRead and rtStatus in r819xU_phy.c
  staging: rtl8192u: replace __FUNCTION__ in r819xU_phy.c
  staging: rtl8192u: limit line size in r819xU_phy.c
  zram: allow request end to coincide with disksize
  staging: drm/imx: use generic irq chip unused field to block out invalid irqs
  staging: drm/imx: use generic irqchip
  staging: drm/imx: ipu-dmfc: use defines for ipu channel numbers
  ...

1 files changed, 227 insertions, 0 deletions

diff --git a/drivers/iio/trigger/iio-trig-sysfs.c b/drivers/iio/trigger/iio-trig-sysfs.c
new file mode 100644
index 000000000000..effcd0ac98d8
--- /dev/null
+++ b/drivers/iio/trigger/iio-trig-sysfs.c
@@ -0,0 +1,227 @@
+/*
+ * Copyright 2011 Analog Devices Inc.
+ *
+ * Licensed under the GPL-2.
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/list.h>
+#include <linux/irq_work.h>
+
+#include <linux/iio/iio.h>
+#include <linux/iio/trigger.h>
+
+struct iio_sysfs_trig {
+	struct iio_trigger *trig;
+	struct irq_work work;
+	int id;
+	struct list_head l;
+};
+
+static LIST_HEAD(iio_sysfs_trig_list);
+static DEFINE_MUTEX(iio_syfs_trig_list_mut);
+
+static int iio_sysfs_trigger_probe(int id);
+static ssize_t iio_sysfs_trig_add(struct device *dev,
+				  struct device_attribute *attr,
+				  const char *buf,
+				  size_t len)
+{
+	int ret;
+	unsigned long input;
+
+	ret = kstrtoul(buf, 10, &input);
+	if (ret)
+		return ret;
+	ret = iio_sysfs_trigger_probe(input);
+	if (ret)
+		return ret;
+	return len;
+}
+static DEVICE_ATTR(add_trigger, S_IWUSR, NULL, &iio_sysfs_trig_add);
+
+static int iio_sysfs_trigger_remove(int id);
+static ssize_t iio_sysfs_trig_remove(struct device *dev,
+				     struct device_attribute *attr,
+				     const char *buf,
+				     size_t len)
+{
+	int ret;
+	unsigned long input;
+
+	ret = kstrtoul(buf, 10, &input);
+	if (ret)
+		return ret;
+	ret = iio_sysfs_trigger_remove(input);
+	if (ret)
+		return ret;
+	return len;
+}
+
+static DEVICE_ATTR(remove_trigger, S_IWUSR, NULL, &iio_sysfs_trig_remove);
+
+static struct attribute *iio_sysfs_trig_attrs[] = {
+	&dev_attr_add_trigger.attr,
+	&dev_attr_remove_trigger.attr,
+	NULL,
+};
+
+static const struct attribute_group iio_sysfs_trig_group = {
+	.attrs = iio_sysfs_trig_attrs,
+};
+
+static const struct attribute_group *iio_sysfs_trig_groups[] = {
+	&iio_sysfs_trig_group,
+	NULL
+};
+
+
+/* Nothing to actually do upon release */
+static void iio_trigger_sysfs_release(struct device *dev)
+{
+}
+
+static struct device iio_sysfs_trig_dev = {
+	.bus = &iio_bus_type,
+	.groups = iio_sysfs_trig_groups,
+	.release = &iio_trigger_sysfs_release,
+};
+
+static void iio_sysfs_trigger_work(struct irq_work *work)
+{
+	struct iio_sysfs_trig *trig = container_of(work, struct iio_sysfs_trig,
+							work);
+
+	iio_trigger_poll(trig->trig, 0);
+}
+
+static ssize_t iio_sysfs_trigger_poll(struct device *dev,
+		struct device_attribute *attr, const char *buf, size_t count)
+{
+	struct iio_trigger *trig = to_iio_trigger(dev);
+	struct iio_sysfs_trig *sysfs_trig = iio_trigger_get_drvdata(trig);
+
+	irq_work_queue(&sysfs_trig->work);
+
+	return count;
+}
+
+static DEVICE_ATTR(trigger_now, S_IWUSR, NULL, iio_sysfs_trigger_poll);
+
+static struct attribute *iio_sysfs_trigger_attrs[] = {
+	&dev_attr_trigger_now.attr,
+	NULL,
+};
+
+static const struct attribute_group iio_sysfs_trigger_attr_group = {
+	.attrs = iio_sysfs_trigger_attrs,
+};
+
+static const struct attribute_group *iio_sysfs_trigger_attr_groups[] = {
+	&iio_sysfs_trigger_attr_group,
+	NULL
+};
+
+static const struct iio_trigger_ops iio_sysfs_trigger_ops = {
+	.owner = THIS_MODULE,
+};
+
+static int iio_sysfs_trigger_probe(int id)
+{
+	struct iio_sysfs_trig *t;
+	int ret;
+	bool foundit = false;
+	mutex_lock(&iio_syfs_trig_list_mut);
+	list_for_each_entry(t, &iio_sysfs_trig_list, l)
+		if (id == t->id) {
+			foundit = true;
+			break;
+		}
+	if (foundit) {
+		ret = -EINVAL;
+		goto out1;
+	}
+	t = kmalloc(sizeof(*t), GFP_KERNEL);
+	if (t == NULL) {
+		ret = -ENOMEM;
+		goto out1;
+	}
+	t->id = id;
+	t->trig = iio_trigger_alloc("sysfstrig%d", id);
+	if (!t->trig) {
+		ret = -ENOMEM;
+		goto free_t;
+	}
+
+	t->trig->dev.groups = iio_sysfs_trigger_attr_groups;
+	t->trig->ops = &iio_sysfs_trigger_ops;
+	t->trig->dev.parent = &iio_sysfs_trig_dev;
+	iio_trigger_set_drvdata(t->trig, t);
+
+	init_irq_work(&t->work, iio_sysfs_trigger_work);
+
+	ret = iio_trigger_register(t->trig);
+	if (ret)
+		goto out2;
+	list_add(&t->l, &iio_sysfs_trig_list);
+	__module_get(THIS_MODULE);
+	mutex_unlock(&iio_syfs_trig_list_mut);
+	return 0;
+
+out2:
+	iio_trigger_put(t->trig);
+free_t:
+	kfree(t);
+out1:
+	mutex_unlock(&iio_syfs_trig_list_mut);
+	return ret;
+}
+
+static int iio_sysfs_trigger_remove(int id)
+{
+	bool foundit = false;
+	struct iio_sysfs_trig *t;
+	mutex_lock(&iio_syfs_trig_list_mut);
+	list_for_each_entry(t, &iio_sysfs_trig_list, l)
+		if (id == t->id) {
+			foundit = true;
+			break;
+		}
+	if (!foundit) {
+		mutex_unlock(&iio_syfs_trig_list_mut);
+		return -EINVAL;
+	}
+
+	iio_trigger_unregister(t->trig);
+	iio_trigger_free(t->trig);
+
+	list_del(&t->l);
+	kfree(t);
+	module_put(THIS_MODULE);
+	mutex_unlock(&iio_syfs_trig_list_mut);
+	return 0;
+}
+
+
+static int __init iio_sysfs_trig_init(void)
+{
+	device_initialize(&iio_sysfs_trig_dev);
+	dev_set_name(&iio_sysfs_trig_dev, "iio_sysfs_trigger");
+	return device_add(&iio_sysfs_trig_dev);
+}
+module_init(iio_sysfs_trig_init);
+
+static void __exit iio_sysfs_trig_exit(void)
+{
+	device_unregister(&iio_sysfs_trig_dev);
+}
+module_exit(iio_sysfs_trig_exit);
+
+MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
+MODULE_DESCRIPTION("Sysfs based trigger for the iio subsystem");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:iio-trig-sysfs");