On Fri, Nov 06, 2015 at 07:35:10PM +0800, Baolin Wang wrote:
> The usb charger framework is based on usb gadget. The usb charger
> need to be notified the state changing of usb gadget to confirm the
> usb charger state.
>
> Thus this patch adds a notifier mechanism for usb gadget to report a
> event to usb charger when the usb gadget state is changed.
I thought we said we did not want another notifier chain in the previous
versions of this patch?
>
> Signed-off-by: Baolin Wang <baolin.w...@linaro.org>
> ---
> drivers/usb/gadget/udc/udc-core.c | 32 ++++++++++++++++++++++++++++++++
> include/linux/usb/gadget.h | 18 ++++++++++++++++++
> 2 files changed, 50 insertions(+)
>
> diff --git a/drivers/usb/gadget/udc/udc-core.c
> b/drivers/usb/gadget/udc/udc-core.c
> index f660afb..4238fc3 100644
> --- a/drivers/usb/gadget/udc/udc-core.c
> +++ b/drivers/usb/gadget/udc/udc-core.c
> @@ -129,6 +129,32 @@ void usb_gadget_giveback_request(struct usb_ep *ep,
> }
> EXPORT_SYMBOL_GPL(usb_gadget_giveback_request);
>
> +int usb_gadget_register_notify(struct usb_gadget *gadget,
> + struct notifier_block *nb)
> +{
> + int ret;
> +
> + mutex_lock(&gadget->lock);
> + ret = raw_notifier_chain_register(&gadget->nh, nb);
> + mutex_unlock(&gadget->lock);
> +
> + return ret;
> +}
> +EXPORT_SYMBOL_GPL(usb_gadget_register_notify);
> +
> +int usb_gadget_unregister_notify(struct usb_gadget *gadget,
> + struct notifier_block *nb)
> +{
> + int ret;
> +
> + mutex_lock(&gadget->lock);
> + ret = raw_notifier_chain_unregister(&gadget->nh, nb);
> + mutex_unlock(&gadget->lock);
> +
> + return ret;
> +}
> +EXPORT_SYMBOL_GPL(usb_gadget_unregister_notify);
> +
> /* -------------------------------------------------------------------------
> */
>
> /**
> @@ -226,6 +252,10 @@ static void usb_gadget_state_work(struct work_struct
> *work)
> struct usb_gadget *gadget = work_to_gadget(work);
> struct usb_udc *udc = gadget->udc;
>
> + mutex_lock(&gadget->lock);
> + raw_notifier_call_chain(&gadget->nh, gadget->state, gadget);
> + mutex_unlock(&gadget->lock);
> +
> if (udc)
> sysfs_notify(&udc->dev.kobj, NULL, "state");
> }
> @@ -364,6 +394,8 @@ int usb_add_gadget_udc_release(struct device *parent,
> struct usb_gadget *gadget,
>
> dev_set_name(&gadget->dev, "gadget");
> INIT_WORK(&gadget->work, usb_gadget_state_work);
> + RAW_INIT_NOTIFIER_HEAD(&gadget->nh);
> + mutex_init(&gadget->lock);
> gadget->dev.parent = parent;
>
> #ifdef CONFIG_HAS_DMA
> diff --git a/include/linux/usb/gadget.h b/include/linux/usb/gadget.h
> index c14a69b..755e8bc 100644
> --- a/include/linux/usb/gadget.h
> +++ b/include/linux/usb/gadget.h
> @@ -609,6 +609,8 @@ struct usb_gadget {
> unsigned out_epnum;
> unsigned in_epnum;
> struct usb_otg_caps *otg_caps;
> + struct raw_notifier_head nh;
> + struct mutex lock;
You have to document what this lock protects.
>
> unsigned sg_supported:1;
> unsigned is_otg:1;
> @@ -1183,6 +1185,22 @@ extern void usb_gadget_unmap_request(struct usb_gadget
> *gadget,
>
> /*-------------------------------------------------------------------------*/
>
> +/**
> + * Register a notifiee to get notified by any attach status changes from
> + * the usb gadget
> + */
kerneldoc does not belong in a .h file.
And the kbuild system found lots of problems with this series, please
fix those at the very least :(
thanks,
greg k-h
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