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Date: Mon, 17 Aug 2015 08:40:10 +0800
From: Peter Chen <peter.chen@...escale.com>
To: Baolin Wang <baolin.wang@...aro.org>
CC: <balbi@...com>, <broonie@...nel.org>, <linus.walleij@...aro.org>,
<linux-kernel@...r.kernel.org>, <gregkh@...uxfoundation.org>,
<sojka@...ica.cz>, <stern@...land.harvard.edu>,
<r.baldyga@...sung.com>, <yoshihiro.shimoda.uh@...esas.com>,
<linux-usb@...r.kernel.org>,
<device-mainlining@...ts.linuxfoundation.org>, <sre@...nel.org>,
<dbaryshkov@...il.com>, <dwmw2@...radead.org>,
<sameo@...ux.intel.com>, <lee.jones@...aro.org>,
<patches@...nsource.wolfsonmicro.com>, <linux-pm@...r.kernel.org>
Subject: Re: [PATCH v2 1/3] gadget: Support for the usb charger framework
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.wang@...aro.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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