On Fri, Aug 14, 2015 at 05:47:44PM +0800, Baolin Wang wrote:
> The usb charger framework is based on usb gadget, and each usb gadget
> can be one usb charger to set the current limitation.
> 
> This patch adds a notifier mechanism for usb charger to report to usb
> charger when the usb gadget state is changed.
> 
> Also we introduce a callback 'get_charger_type' which will implemented
> by user for usb gadget operations to get the usb charger type.
> 
> Signed-off-by: Baolin Wang <baolin.w...@linaro.org>
> ---
>  drivers/usb/gadget/udc/udc-core.c |   38 
> +++++++++++++++++++++++++++++++++++++
>  include/linux/usb/gadget.h        |   20 +++++++++++++++++++
>  2 files changed, 58 insertions(+)
> 
> diff --git a/drivers/usb/gadget/udc/udc-core.c 
> b/drivers/usb/gadget/udc/udc-core.c
> index f660afb..47b231c 100644
> --- a/drivers/usb/gadget/udc/udc-core.c
> +++ b/drivers/usb/gadget/udc/udc-core.c
> @@ -28,6 +28,7 @@
>  #include <linux/usb/ch9.h>
>  #include <linux/usb/gadget.h>
>  #include <linux/usb.h>
> +#include <linux/usb/usb_charger.h>
>  
>  /**
>   * struct usb_udc - describes one usb device controller
> @@ -129,6 +130,32 @@ 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 +253,10 @@ 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 +395,8 @@ 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
> @@ -405,6 +438,10 @@ int usb_add_gadget_udc_release(struct device *parent, 
> struct usb_gadget *gadget,
>  
>       mutex_unlock(&udc_lock);
>  
> +     ret = usb_charger_init(gadget);
> +     if (ret)
> +             goto err4;
> +

If the charger's initialization fails, you may need to
call device_del(&udc->dev).

Peter

>       return 0;
>  
>  err4:
> @@ -481,6 +518,7 @@ void usb_del_gadget_udc(struct usb_gadget *gadget)
>       kobject_uevent(&udc->dev.kobj, KOBJ_REMOVE);
>       flush_work(&gadget->work);
>       device_unregister(&udc->dev);
> +     usb_charger_exit(gadget);
>       device_unregister(&gadget->dev);
>  }
>  EXPORT_SYMBOL_GPL(usb_del_gadget_udc);
> diff --git a/include/linux/usb/gadget.h b/include/linux/usb/gadget.h
> index c14a69b..78cc862 100644
> --- a/include/linux/usb/gadget.h
> +++ b/include/linux/usb/gadget.h
> @@ -537,6 +537,7 @@ struct usb_gadget_ops {
>       struct usb_ep *(*match_ep)(struct usb_gadget *,
>                       struct usb_endpoint_descriptor *,
>                       struct usb_ss_ep_comp_descriptor *);
> +     enum usb_charger_type   (*get_charger_type)(struct usb_gadget *);
>  };
>  
>  /**
> @@ -609,6 +610,9 @@ struct usb_gadget {
>       unsigned                        out_epnum;
>       unsigned                        in_epnum;
>       struct usb_otg_caps             *otg_caps;
> +     struct raw_notifier_head        nh;
> +     struct usb_charger              *uchger;
> +     struct mutex                    lock;
>  
>       unsigned                        sg_supported:1;
>       unsigned                        is_otg:1;
> @@ -1183,6 +1187,22 @@ 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
> + */
> +int usb_gadget_register_notify(struct usb_gadget *gadget,
> +                            struct notifier_block *nb);
> +
> +/*-------------------------------------------------------------------------*/
> +
> +
> +/* Unregister a notifiee from the usb gadget */
> +int usb_gadget_unregister_notify(struct usb_gadget *gadget,
> +                              struct notifier_block *nb);
> +
> +/*-------------------------------------------------------------------------*/
> +
>  /* utility to set gadget state properly */
>  
>  extern void usb_gadget_set_state(struct usb_gadget *gadget,
> -- 
> 1.7.9.5
> 

-- 

Best Regards,
Peter Chen
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