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

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Date:	Tue, 18 Oct 2011 20:25:26 +0200
From:	Lars-Peter Clausen <lars@...afoo.de>
To:	Jonathan Cameron <jic23@....ac.uk>
CC:	linux-kernel@...r.kernel.org, linux-iio@...r.kernel.org,
	linus.ml.walleij@...il.com, zdevai@...il.com,
	linux@....linux.org.uk, arnd@...db.de,
	broonie@...nsource.wolfsonmicro.com, gregkh@...e.de
Subject: Re: [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@....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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