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SubjectRe: [PATCH 3/6] IIO:CORE add global list of registered IIO devices.
On 10/18/2011 05:29 PM, Jonathan Cameron wrote:
> Needed for inkernel interfaces.
>

The bus_type structure keeps a list of all devices registered on that bus, so
you should be able to use bus_for_each_dev and bus_find_device for iterating
over the iio devices.

> Signed-off-by: Jonathan Cameron <jic23@cam.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;



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