On Mar 10 2017 or thereabouts, Dmitry Torokhov wrote:
> i2c bus has 2 different types of device belonging to the same bus and
> bus notifiers use device type to distinguish between adapters and clients.
> Previously we only had i2c_adapter_type exported, which made code wanting
> to work with i2c_client devices test for type not equal to adapter type.
> This unfortunately is not safe if we ever add another type to the bus,
> so let's export i2c_client_type as well.
>
> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@xxxxxxxxx>
> ---
Acked-by: Benjamin Tissoires <benjamin.tissoires@xxxxxxxxxx>
> drivers/i2c/i2c-core.c | 4 ++--
> include/linux/i2c.h | 1 +
> 2 files changed, 3 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/i2c/i2c-core.c b/drivers/i2c/i2c-core.c
> index 34a5115484dd..446e341e9508 100644
> --- a/drivers/i2c/i2c-core.c
> +++ b/drivers/i2c/i2c-core.c
> @@ -74,7 +74,6 @@
> static DEFINE_MUTEX(core_lock);
> static DEFINE_IDR(i2c_adapter_idr);
>
> -static struct device_type i2c_client_type;
> static int i2c_detect(struct i2c_adapter *adapter, struct i2c_driver *driver);
>
> static struct static_key i2c_trace_msg = STATIC_KEY_INIT_FALSE;
> @@ -1096,11 +1095,12 @@ struct bus_type i2c_bus_type = {
> };
> EXPORT_SYMBOL_GPL(i2c_bus_type);
>
> -static struct device_type i2c_client_type = {
> +struct device_type i2c_client_type = {
> .groups = i2c_dev_groups,
> .uevent = i2c_device_uevent,
> .release = i2c_client_dev_release,
> };
> +EXPORT_SYMBOL_GPL(i2c_client_type);
>
>
> /**
> diff --git a/include/linux/i2c.h b/include/linux/i2c.h
> index 2cc3988d127b..89ca5e56b433 100644
> --- a/include/linux/i2c.h
> +++ b/include/linux/i2c.h
> @@ -37,6 +37,7 @@
>
> extern struct bus_type i2c_bus_type;
> extern struct device_type i2c_adapter_type;
> +extern struct device_type i2c_client_type;
>
> /* --- General options ------------------------------------------------ */
>
> --
> 2.12.0.246.ga2ecc84866-goog
>
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