usb: gadget: add usb otg descriptor allocate and init interface

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@freescale.com>
Reviewed-by: Roger Quadros <rogerq@ti.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>

diff --git a/drivers/usb/gadget/config.c b/drivers/usb/gadget/config.c
index 34e12fc..0fafa7a 100644 (file)
--- 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) {
+               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 fffceaf..cea0511 100644 (file)
--- a/include/linux/usb/gadget.h
+++ b/include/linux/usb/gadget.h
@@ -1092,6 +1092,10 @@ 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 */