On 16/05/16 12:23, Peter Chen wrote:
> On Mon, May 16, 2016 at 11:26:57AM +0300, Roger Quadros wrote:
>> Hi,
>>
>> On 16/05/16 10:02, Peter Chen wrote:
>>> On Fri, May 13, 2016 at 01:03:27PM +0300, Roger Quadros wrote:
>>>> +
>>>> +static int usb_gadget_connect_control(struct usb_gadget *gadget, bool
>>>> connect)
>>>> +{
>>>> + struct usb_udc *udc;
>>>> +
>>>> + mutex_lock(&udc_lock);
>>>> + udc = usb_gadget_to_udc(gadget);
>>>> + if (!udc) {
>>>> + dev_err(gadget->dev.parent, "%s: gadget not registered.\n",
>>>> + __func__);
>>>> + mutex_unlock(&udc_lock);
>>>> + return -EINVAL;
>>>> + }
>>>> +
>>>> + if (connect) {
>>>> + if (!gadget->connected)
>>>> + usb_gadget_connect(udc->gadget);
>>>> + } else {
>>>> + if (gadget->connected) {
>>>> + usb_gadget_disconnect(udc->gadget);
>>>> + udc->driver->disconnect(udc->gadget);
>>>> + }
>>>> + }
>>>> +
>>>> + mutex_unlock(&udc_lock);
>>>> +
>>>> + return 0;
>>>> +}
>>>> +
>>>
>>> Since this is called for vbus interrupt, why not using
>>> usb_udc_vbus_handler directly, and call udc->driver->disconnect
>>> at usb_gadget_stop.
>>
>> We can't assume that this is always called for vbus interrupt so
>> I decided not to call usb_udc_vbus_handler.
>>
>> udc->vbus is really pointless for us. We keep vbus states in our
>> state machine and leave udc->vbus as ture always.
>>
>> Why do you want to move udc->driver->disconnect() to stop?
>> If USB controller disconnected from bus then the gadget driver
>> must be notified about the disconnect immediately. The controller
>> may or may not be stopped by the core.
>>
>
> Then, would you give some comments when this API will be used?
> I was assumed it is only used for drd state machine.
drd_state machine didn't even need this API in the first place :).
You guys wanted me to separate out start/stop and connect/disconnect for full
OTG case.
Won't full OTG state machine want to use this API? If not what would it use?
cheers,
-roger
>
>>>
>>>> return 0;
>>>> @@ -660,9 +830,15 @@ static ssize_t usb_udc_softconn_store(struct device
>>>> *dev,
>>>> return -EOPNOTSUPP;
>>>> }
>>>>
>>>> + /* In OTG mode we don't support softconnect, but b_bus_req */
>>>> + if (udc->gadget->otg_dev) {
>>>> + dev_err(dev, "soft-connect not supported in OTG mode\n");
>>>> + return -EOPNOTSUPP;
>>>> + }
>>>> +
>>>
>>> The soft-connect can be supported at dual-role mode currently, we can
>>> use b_bus_req entry once it is implemented later.
>>
>> Soft-connect should be done via sysfs handling within the OTG core.
>> This can be added later. I don't want anything outside the OTG core
>> to handle soft-connect behaviour as it will be hard to keep things
>> in sync.
>>
>> I can update the comment to something like this.
>>
>> /* In OTG/dual-role mode, soft-connect should be handled by OTG core */
>
> Ok, let's Felipe decide it.
>
>>
>>>
>>>> if (sysfs_streq(buf, "connect")) {
>>>> usb_gadget_udc_start(udc);
>>>> - usb_gadget_connect(udc->gadget);
>>>> + usb_udc_connect_control(udc);
>>>
>>> This line seems to be not related with this patch.
>>>
>> Right. I'll remove it.
>>
>> cheers,
>> -roger
>
--
To unsubscribe from this list: send the line "unsubscribe linux-usb" in
the body of a message to majord...@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
