On Mon, 8 Jun 2015 23:02:04 +0800
Li Jun <jun.li@xxxxxxxxxxxxx> 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@xxxxxxxxxxxxx>
> ---
> drivers/usb/gadget/config.c | 37 +++++++++++++++++++++++++++++++++++++
> include/linux/usb/gadget.h | 1 +
> 2 files changed, 38 insertions(+)
>
> diff --git a/drivers/usb/gadget/config.c b/drivers/usb/gadget/config.c
> index 34e12fc..a86e079 100644
> --- a/drivers/usb/gadget/config.c
> +++ b/drivers/usb/gadget/config.c
> @@ -195,3 +195,40 @@ void usb_free_all_descriptors(struct usb_function *f)
> usb_free_descriptors(f->ss_descriptors);
> }
> EXPORT_SYMBOL_GPL(usb_free_all_descriptors);
> +
> +struct usb_otg_descriptor *usb_otg_descriptor_add(struct usb_gadget *gadget)
> +{
> + struct usb_otg_descriptor *otg_desc;
> + unsigned otg_desc_length;
> +
> + if (gadget->otg_rev >= 0x0200)
> + otg_desc_length = sizeof(*otg_desc) + sizeof(struct bcdOTG);
> + else
> + otg_desc_length = sizeof(*otg_desc);
> +
> + otg_desc = (struct usb_otg_descriptor *)kzalloc(otg_desc_length,
> + GFP_KERNEL);
You are allocating memory here and expecting users will free it.
I suggest that you pass pointer to otg_desc as function argument and leave it upto
the caller to allocate/deallocate memory for it.
Most likely users will be a static allocation like they do now and it is a
lot simpler.
> + if (!otg_desc)
> + return otg_desc;
> +
> + otg_desc->bLength = otg_desc_length;
> + otg_desc->bDescriptorType = USB_DT_OTG;
> +
> + if (gadget->adp_support || gadget->hnp_support ||
> + gadget->srp_support) {
> + if (gadget->adp_support)
> + otg_desc->bmAttributes |= USB_OTG_ADP;
> + if (gadget->hnp_support)
> + otg_desc->bmAttributes |= USB_OTG_HNP;
> + if (gadget->srp_support)
> + otg_desc->bmAttributes |= USB_OTG_SRP;
> + } else {
> + otg_desc->bmAttributes = USB_OTG_SRP | USB_OTG_HNP;
> + }
> +
> + if (gadget->otg_rev >= 0x0200)
> + otg_desc->otg_rev[0].bcdOTG = cpu_to_le16(gadget->otg_rev);
> +
> + return otg_desc;
> +}
> +EXPORT_SYMBOL_GPL(usb_otg_descriptor_add);
> diff --git a/include/linux/usb/gadget.h b/include/linux/usb/gadget.h
> index 2f4f39c..e210466 100644
> --- a/include/linux/usb/gadget.h
> +++ b/include/linux/usb/gadget.h
> @@ -1013,6 +1013,7 @@ int usb_assign_descriptors(struct usb_function *f,
> struct usb_descriptor_header **ss);
> void usb_free_all_descriptors(struct usb_function *f);
>
> +struct usb_otg_descriptor *usb_otg_descriptor_add(struct usb_gadget *gadget);
> /*-------------------------------------------------------------------------*/
>
> /* utility to simplify map/unmap of usb_requests to/from DMA */
cheers,
-roger
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