On Wed, 17 Jun 2015 13:43:42 +0800
Li Jun <jun.li@xxxxxxxxxxxxx> wrote:
> Allocate usb otg descriptor and initialize it according to gadget's otg
> capabilities, if usb_otg_caps is not set, keep settings as current gadget
> drivers. With this 2 new interfaces, gadget can use usb_otg_descriptor
> for OTG 1.x, and usb_otg20_descriptor for OTG 2.0 or above, 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 | 56 +++++++++++++++++++++++++++++++++++++++++++++
> include/linux/usb/gadget.h | 4 ++++
> 2 files changed, 60 insertions(+)
>
> diff --git a/drivers/usb/gadget/config.c b/drivers/usb/gadget/config.c
> index 34e12fc..0fafa7a 100644
> --- a/drivers/usb/gadget/config.c
> +++ b/drivers/usb/gadget/config.c
> @@ -20,6 +20,7 @@
> #include <linux/usb/ch9.h>
> #include <linux/usb/gadget.h>
> #include <linux/usb/composite.h>
> +#include <linux/usb/otg.h>
>
> /**
> * usb_descriptor_fillbuf - fill buffer with descriptors
> @@ -195,3 +196,58 @@ void usb_free_all_descriptors(struct usb_function *f)
> usb_free_descriptors(f->ss_descriptors);
> }
> EXPORT_SYMBOL_GPL(usb_free_all_descriptors);
> +
> +struct usb_descriptor_header *usb_otg_descriptor_alloc(
> + struct usb_gadget *gadget)
> +{
> + struct usb_descriptor_header *otg_desc;
> + unsigned length = 0;
> +
> + if (gadget->otg_caps && (gadget->otg_caps->otg_rev >= 0x0200))
> + length = sizeof(struct usb_otg20_descriptor);
> + else
> + length = sizeof(struct usb_otg_descriptor);
> +
> + otg_desc = kzalloc(length, GFP_KERNEL);
> + return otg_desc;
> +}
> +EXPORT_SYMBOL_GPL(usb_otg_descriptor_alloc);
> +
> +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;
> + struct usb_otg_caps *otg_caps = gadget->otg_caps;
> + u8 otg_attributes = 0;
> +
> + if (!otg_desc)
> + return -EINVAL;
> +
> + if (otg_caps && otg_caps->otg_rev) {
OK now I see why usb_gadget->otg_caps needs to be a pointer. :)
> + if (otg_caps->hnp_support)
> + otg_attributes |= USB_OTG_HNP;
> + if (otg_caps->srp_support)
> + otg_attributes |= USB_OTG_SRP;
> + if (otg_caps->adp_support && (otg_caps->otg_rev >= 0x0200))
> + otg_attributes |= USB_OTG_ADP;
> + } else {
> + otg_attributes = USB_OTG_SRP | USB_OTG_HNP;
> + }
> +
> + if (otg_caps && (otg_caps->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(otg_caps->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 6b39087..5f65bd2 100644
> --- a/include/linux/usb/gadget.h
> +++ b/include/linux/usb/gadget.h
> @@ -1004,6 +1004,10 @@ int usb_assign_descriptors(struct usb_function *f,
> struct usb_descriptor_header **ss);
> void usb_free_all_descriptors(struct usb_function *f);
>
> +struct usb_descriptor_header *usb_otg_descriptor_alloc(
> + struct usb_gadget *gadget);
> +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 */
Reviewed-by: Roger Quadros <rogerq@xxxxxx>
cheers,
-roger
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