Re: [PATCH v3 09/22] usb: gadget: add usb_otg_descriptor_add interface to init usb_otg_descriptor

[Roger Quadros <rogerq-l0cyMroinI0@public.gmane.org>]

On Tue, 16 Jun 2015 14:51:59 +0800
Li Jun <jun.li-KZfg59tc24xl57MIdRCFDg@public.gmane.org> wrote:

> Allocate usb_otg_descriptor and initialize it according to gadget otg
> options, if none of options is not set, keep bmAttributes setting as
> current gadget drivers, with this new interface, usb_otg_descriptor can
> include bcdOTG if OTG 2.0 or later, and otg features can be decided by
> the combination of usb hardware property and driver config.
> 
> Signed-off-by: Li Jun <jun.li-KZfg59tc24xl57MIdRCFDg@public.gmane.org>
> ---
>  drivers/usb/gadget/config.c | 39 +++++++++++++++++++++++++++++++++++++++
>  include/linux/usb/gadget.h  |  2 ++
>  2 files changed, 41 insertions(+)
> 
> diff --git a/drivers/usb/gadget/config.c b/drivers/usb/gadget/config.c
> index 34e12fc..9ebc052 100644
> --- a/drivers/usb/gadget/config.c
> +++ b/drivers/usb/gadget/config.c
> @@ -195,3 +195,42 @@ void usb_free_all_descriptors(struct usb_function *f)
>  	usb_free_descriptors(f->ss_descriptors);
>  }
>  EXPORT_SYMBOL_GPL(usb_free_all_descriptors);
> +
> +int usb_otg_descriptor_init(struct usb_gadget *gadget,
> +		struct usb_descriptor_header *otg_desc)
> +{
> +	struct usb_otg_descriptor *otg1x_desc;
> +	struct usb_otg20_descriptor *otg20_desc;
> +	u8 otg_attributes = 0;
> +
> +	if (!otg_desc)
> +		return -EINVAL;
> +
> +	if (gadget->adp_support || gadget->hnp_support ||
> +					gadget->srp_support) {
> +		if (gadget->adp_support)
> +			otg_attributes |= USB_OTG_ADP;
> +		if (gadget->hnp_support)
> +			otg_attributes |= USB_OTG_HNP;
> +		if (gadget->srp_support)
> +			otg_attributes |= USB_OTG_SRP;
> +	} else {
> +		otg_attributes = USB_OTG_SRP | USB_OTG_HNP;
> +	}

Didn't we agree that if otg_rev is not set then only we will use the legacy
method?

> +
> +	if (gadget->otg_rev >= 0x0200) {
> +		otg20_desc = (struct usb_otg20_descriptor *)otg_desc;
> +		otg20_desc->bLength = sizeof(struct usb_otg20_descriptor);
> +		otg20_desc->bDescriptorType = USB_DT_OTG;
> +		otg20_desc->bmAttributes = otg_attributes;
> +		otg20_desc->bcdOTG = cpu_to_le16(gadget->otg_rev);
> +	} else {
> +		otg1x_desc = (struct usb_otg_descriptor *)otg_desc;
> +		otg1x_desc->bLength = sizeof(struct usb_otg_descriptor);
> +		otg1x_desc->bDescriptorType = USB_DT_OTG;
> +		otg1x_desc->bmAttributes = otg_attributes;
> +	}
> +
> +	return 0;
> +}
> +EXPORT_SYMBOL_GPL(usb_otg_descriptor_init);
> diff --git a/include/linux/usb/gadget.h b/include/linux/usb/gadget.h
> index 814cb70..b77730e 100644
> --- a/include/linux/usb/gadget.h
> +++ b/include/linux/usb/gadget.h
> @@ -1013,6 +1013,8 @@ int usb_assign_descriptors(struct usb_function *f,
>  		struct usb_descriptor_header **ss);
>  void usb_free_all_descriptors(struct usb_function *f);
>  
> +int usb_otg_descriptor_init(struct usb_gadget *gadget,
> +		struct usb_descriptor_header *otg_desc);
>  /*-------------------------------------------------------------------------*/
>  
>  /* utility to simplify map/unmap of usb_requests to/from DMA */

cheers,
-roger
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