linux-kernel - [PATCH 3/6] IIO:CORE add global list of registered IIO devices.

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Message-Id: <1318951776-19393-4-git-send-email-jic23@cam.ac.uk>
Date:	Tue, 18 Oct 2011 16:29:33 +0100
From:	Jonathan Cameron <jic23@....ac.uk>
To:	linux-kernel@...r.kernel.org, linux-iio@...r.kernel.org
Cc:	linus.ml.walleij@...il.com, zdevai@...il.com,
	linux@....linux.org.uk, arnd@...db.de,
	broonie@...nsource.wolfsonmicro.com, gregkh@...e.de,
	Jonathan Cameron <jic23@....ac.uk>
Subject: [PATCH 3/6] IIO:CORE add global list of registered IIO devices.

Needed for inkernel interfaces.

Signed-off-by: Jonathan Cameron <jic23@....ac.uk>
---
 drivers/iio/iio.c       |    9 +++++++++
 include/linux/iio/iio.h |    1 +
 2 files changed, 10 insertions(+), 0 deletions(-)

diff --git a/drivers/iio/iio.c b/drivers/iio/iio.c
index 9e6acc1..246a093 100644
--- a/drivers/iio/iio.c
+++ b/drivers/iio/iio.c
@@ -15,6 +15,9 @@
 #include <linux/iio/iio.h>
 #include <linux/iio/sysfs.h>
 
+static DEFINE_MUTEX(iio_device_list_lock);
+static LIST_HEAD(iio_device_list);
+
 static DEFINE_IDA(iio_ida);
 
 static struct bus_type iio_bus_type = {
@@ -91,6 +94,9 @@ static void iio_dev_release(struct device *device)
 {
 	struct iio_dev *indio_dev = container_of(device, struct iio_dev, dev);
 	iio_device_unregister_sysfs(indio_dev);
+	mutex_lock(&iio_device_list_lock);
+	list_del(&indio_dev->dev_list_entry);
+	mutex_unlock(&iio_device_list_lock);
 }
 
 static struct device_type iio_dev_type = {
@@ -559,6 +565,9 @@ int iio_device_register(struct iio_dev *indio_dev)
 	if (ret)
 		goto error_free_sysfs;
 
+	mutex_lock(&iio_device_list_lock);
+	list_add(&indio_dev->dev_list_entry, &iio_device_list);
+	mutex_unlock(&iio_device_list_lock);
 	return 0;
 
 error_free_sysfs:
diff --git a/include/linux/iio/iio.h b/include/linux/iio/iio.h
index beedc5c..f14e7dc 100644
--- a/include/linux/iio/iio.h
+++ b/include/linux/iio/iio.h
@@ -192,6 +192,7 @@ struct iio_info {
  * @info:		[DRIVER] callbacks and constant info from driver
  * @groups:		[INTERN] attribute groups
  * @groupcounter:	[INTERN] index of next attribute group
+ * @dev_list_entry:	[INTERN] entry in global list of iio devices
  **/
 struct iio_dev {
 	int				id;
-- 
1.7.7

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