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usb: composite: add BOS descriptor support to composite framework

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To add usb-3.0 support to peripheral device add BOS & SS capability
descriptors to gadget composite framework.

Signed-off-by: T Karthik Reddy <t.karthik.reddy@xilinx.com>
Signed-off-by: Siva Durga Prasad Paladugu <siva.durga.paladugu@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Reviewed-by: Roger Quadros <rogerq@ti.com>
This commit is contained in:
T Karthik Reddy 2019-10-14 14:52:50 +02:00 committed by Marek Vasut
parent d80effb184
commit f69257baa8
3 changed files with 67 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

61
drivers/usb/gadget/composite.c
View File

@ -688,6 +688,57 @@ static void composite_setup_complete(struct usb_ep *ep, struct usb_request *req)
req->status, req->actual, req->length);
}
static int bos_desc(struct usb_composite_dev *cdev)
{
struct usb_ext_cap_descriptor *usb_ext;
struct usb_bos_descriptor *bos = cdev->req->buf;
bos->bLength = USB_DT_BOS_SIZE;
bos->bDescriptorType = USB_DT_BOS;
bos->wTotalLength = cpu_to_le16(USB_DT_BOS_SIZE);
bos->bNumDeviceCaps = 0;
/*
* A SuperSpeed device shall include the USB2.0 extension descriptor
* and shall support LPM when operating in USB2.0 HS mode.
*/
usb_ext = cdev->req->buf + le16_to_cpu(bos->wTotalLength);
bos->bNumDeviceCaps++;
le16_add_cpu(&bos->wTotalLength, USB_DT_USB_EXT_CAP_SIZE);
usb_ext->bLength = USB_DT_USB_EXT_CAP_SIZE;
usb_ext->bDescriptorType = USB_DT_DEVICE_CAPABILITY;
usb_ext->bDevCapabilityType = USB_CAP_TYPE_EXT;
usb_ext->bmAttributes =
cpu_to_le32(USB_LPM_SUPPORT | USB_BESL_SUPPORT);
/*
* The Superspeed USB Capability descriptor shall be implemented
* by all SuperSpeed devices.
*/
if (gadget_is_superspeed(cdev->gadget)) {
struct usb_ss_cap_descriptor *ss_cap;
ss_cap = cdev->req->buf + le16_to_cpu(bos->wTotalLength);
bos->bNumDeviceCaps++;
le16_add_cpu(&bos->wTotalLength, USB_DT_USB_SS_CAP_SIZE);
ss_cap->bLength = USB_DT_USB_SS_CAP_SIZE;
ss_cap->bDescriptorType = USB_DT_DEVICE_CAPABILITY;
ss_cap->bDevCapabilityType = USB_SS_CAP_TYPE;
ss_cap->bmAttributes = 0; /* LTM is not supported yet */
ss_cap->wSpeedSupported =
cpu_to_le16(USB_LOW_SPEED_OPERATION |
USB_FULL_SPEED_OPERATION |
USB_HIGH_SPEED_OPERATION |
USB_5GBPS_OPERATION);
ss_cap->bFunctionalitySupport = USB_LOW_SPEED_OPERATION;
ss_cap->bU1devExitLat = USB_DEFAULT_U1_DEV_EXIT_LAT;
ss_cap->bU2DevExitLat =
cpu_to_le16(USB_DEFAULT_U2_DEV_EXIT_LAT);
}
return le16_to_cpu(bos->wTotalLength);
}
/*
* The setup() callback implements all the ep0 functionality that's
* not handled lower down, in hardware or the hardware driver(like
@ -776,12 +827,10 @@ composite_setup(struct usb_gadget *gadget, const struct usb_ctrlrequest *ctrl)
value = min(w_length, (u16) value);
break;
case USB_DT_BOS:
/*
* The USB compliance test (USB 2.0 Command Verifier)
* issues this request. We should not run into the
* default path here. But return for now until
* the superspeed support is added.
*/
if (gadget_is_superspeed(cdev->gadget))
value = bos_desc(cdev);
if (value >= 0)
value = min(w_length, (u16)value);
break;
default:
goto unknown;

3
include/linux/usb/ch9.h
View File

@ -878,6 +878,9 @@ struct usb_ss_cap_descriptor { /* Link Power Management */
__le16 bU2DevExitLat;
} __attribute__((packed));
#define USB_DEFAULT_U1_DEV_EXIT_LAT 0x01 /* Less then 1 microsec */
#define USB_DEFAULT_U2_DEV_EXIT_LAT 0x01F4 /* Less then 500 microsec */
#define USB_DT_USB_SS_CAP_SIZE 10
/*

9
include/linux/usb/gadget.h
View File

@ -591,6 +591,15 @@ static inline int gadget_is_otg(struct usb_gadget *g)
#endif
}
/**
* gadget_is_superspeed() - return true if the hardware handles superspeed
* @g: controller that might support superspeed
*/
static inline int gadget_is_superspeed(struct usb_gadget *g)
{
return g->max_speed >= USB_SPEED_SUPER;
}
/**
* usb_gadget_frame_number - returns the current frame number
* @gadget: controller that reports the frame number