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Date: Tue, 11 Oct 2016 11:06:36 +0800
From: Lu Baolu <baolu.lu@...ux.intel.com>
To: Baolin Wang <baolin.wang@...aro.org>, balbi@...nel.org,
gregkh@...uxfoundation.org, sre@...nel.org, dbaryshkov@...il.com,
dwmw2@...radead.org
Cc: robh@...nel.org, jun.li@....com, m.szyprowski@...sung.com,
ruslan.bilovol@...il.com, peter.chen@...escale.com,
stern@...land.harvard.edu, r.baldyga@...sung.com,
grygorii.strashko@...com, yoshihiro.shimoda.uh@...esas.com,
lee.jones@...aro.org, broonie@...nel.org, john.stultz@...aro.org,
ckeepax@...nsource.wolfsonmicro.com,
patches@...nsource.wolfsonmicro.com, linux-pm@...r.kernel.org,
linux-usb@...r.kernel.org,
device-mainlining@...ts.linuxfoundation.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH v17 3/4] usb: gadget: Integrate with the usb gadget
supporting for usb charger
Hi,
On 10/10/2016 02:22 PM, Baolin Wang wrote:
> When the usb gadget supporting for usb charger is ready, the usb charger
> can implement the usb_charger_plug_by_gadget() function, usb_charger_exit()
> function and dev_to_uchger() function by getting 'struct usb_charger' from
> 'struct gadget'.
>
> Signed-off-by: Baolin Wang <baolin.wang@...aro.org>
> Reviewed-by: Li Jun <jun.li@....com>
> Tested-by: Li Jun <jun.li@....com>
> ---
> drivers/usb/gadget/udc/charger.c | 97 +++++++++++++++++++++++++++++++++++++-
> 1 file changed, 95 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/usb/gadget/udc/charger.c b/drivers/usb/gadget/udc/charger.c
> index 16dc477..691cd75 100644
> --- a/drivers/usb/gadget/udc/charger.c
> +++ b/drivers/usb/gadget/udc/charger.c
> @@ -38,7 +38,9 @@ static DEFINE_MUTEX(charger_lock);
>
> static struct usb_charger *dev_to_uchger(struct device *dev)
> {
> - return NULL;
> + struct usb_gadget *gadget = container_of(dev, struct usb_gadget, dev);
> +
> + return gadget->charger;
> }
>
> /*
> @@ -308,6 +310,18 @@ static int __usb_charger_set_cur_limit_by_type(struct usb_charger *uchger,
> int usb_charger_set_cur_limit_by_gadget(struct usb_gadget *gadget,
> unsigned int cur_limit)
> {
> + struct usb_charger *uchger = gadget->charger;
> + int ret;
> +
> + if (!uchger)
> + return -EINVAL;
> +
> + ret = __usb_charger_set_cur_limit_by_type(uchger, uchger->type,
> + cur_limit);
> + if (ret)
> + return ret;
> +
> + schedule_work(&uchger->work);
> return 0;
> }
> EXPORT_SYMBOL_GPL(usb_charger_set_cur_limit_by_gadget);
> @@ -625,11 +639,67 @@ static int usb_charger_plug_by_extcon(struct notifier_block *nb,
> int usb_charger_plug_by_gadget(struct usb_gadget *gadget,
> unsigned long state)
> {
> + struct usb_charger *uchger = gadget->charger;
> + enum usb_charger_state uchger_state;
> +
> + if (WARN(!uchger, "charger can not be NULL"))
> + return -EINVAL;
> +
> + /*
> + * Report event to power to setting the current limitation
> + * for this usb charger when one usb charger state is changed
> + * with detecting by usb gadget state.
> + */
> + if (uchger->old_gadget_state != state) {
> + uchger->old_gadget_state = state;
> +
> + if (state >= USB_STATE_ATTACHED) {
> + uchger_state = USB_CHARGER_PRESENT;
> + } else if (state == USB_STATE_NOTATTACHED) {
> + mutex_lock(&uchger->lock);
> +
> + /*
> + * Need check the charger type to make sure the usb
> + * cable is removed, in case it just changes the usb
> + * function with configfs.
> + */
> + uchger->type = __usb_charger_get_type(uchger);
> + if (uchger->type != UNKNOWN_TYPE) {
> + mutex_unlock(&uchger->lock);
> + return 0;
> + }
> +
> + mutex_unlock(&uchger->lock);
> + uchger_state = USB_CHARGER_REMOVE;
> + } else {
> + uchger_state = USB_CHARGER_DEFAULT;
> + }
> +
> + usb_charger_notify_state(uchger, uchger_state);
> + }
> +
> return 0;
> }
> EXPORT_SYMBOL_GPL(usb_charger_plug_by_gadget);
>
> /*
> + * usb_charger_unregister() - Unregister a usb charger.
> + * @uchger - the usb charger to be unregistered.
> + */
> +static int usb_charger_unregister(struct usb_charger *uchger)
> +{
> + ida_simple_remove(&usb_charger_ida, uchger->id);
> + sysfs_remove_groups(&uchger->gadget->dev.kobj, usb_charger_groups);
> +
> + mutex_lock(&charger_lock);
> + list_del(&uchger->list);
> + mutex_unlock(&charger_lock);
> +
> + kfree(uchger);
Any reasons you want to put kfree() here? You allocated the memory
in usb_charger_init(). Isn't usb_charger_exit() a better place?
Best regards,
Lu Baolu
> + return 0;
> +}
> +
> +/*
> * usb_charger_register() - Register a new usb charger.
> * @uchger - the new usb charger instance.
> */
> @@ -740,6 +810,7 @@ int usb_charger_init(struct usb_gadget *ugadget)
> }
>
> uchger->gadget = ugadget;
> + ugadget->charger = uchger;
> uchger->old_gadget_state = USB_STATE_NOTATTACHED;
>
> /* Register a new usb charger */
> @@ -777,7 +848,29 @@ fail_extcon:
>
> int usb_charger_exit(struct usb_gadget *ugadget)
> {
> - return 0;
> + struct usb_charger *uchger = ugadget->charger;
> +
> + if (!uchger)
> + return -EINVAL;
> +
> + ugadget->charger = NULL;
> + extcon_unregister_notifier(uchger->extcon_dev,
> + EXTCON_USB,
> + &uchger->extcon_nb.nb);
> + extcon_unregister_notifier(uchger->extcon_dev,
> + EXTCON_CHG_USB_SDP,
> + &uchger->extcon_type_nb.nb);
> + extcon_unregister_notifier(uchger->extcon_dev,
> + EXTCON_CHG_USB_CDP,
> + &uchger->extcon_type_nb.nb);
> + extcon_unregister_notifier(uchger->extcon_dev,
> + EXTCON_CHG_USB_DCP,
> + &uchger->extcon_type_nb.nb);
> + extcon_unregister_notifier(uchger->extcon_dev,
> + EXTCON_CHG_USB_ACA,
> + &uchger->extcon_type_nb.nb);
> +
> + return usb_charger_unregister(uchger);
> }
>
> MODULE_AUTHOR("Baolin Wang <baolin.wang@...aro.org>");
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