From d1606dfb98e59221332704c05f5908d9116456ab Mon Sep 17 00:00:00 2001 From: Li Jun Date: Thu, 9 Jul 2015 15:18:47 +0800 Subject: [PATCH] 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 Reviewed-by: Roger Quadros Signed-off-by: Felipe Balbi --- 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 34e12fc52c23..0fafa7a1b6f6 100644 --- a/drivers/usb/gadget/config.c +++ b/drivers/usb/gadget/config.c @@ -20,6 +20,7 @@ #include #include #include +#include /** * 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 fffceafb6b8c..cea0511a1bc9 100644 --- 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 */ -- 2.20.1