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930 lines
35 KiB
930 lines
35 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* <linux/usb/gadget.h> |
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* |
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* We call the USB code inside a Linux-based peripheral device a "gadget" |
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* driver, except for the hardware-specific bus glue. One USB host can |
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* talk to many USB gadgets, but the gadgets are only able to communicate |
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* to one host. |
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* |
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* |
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* (C) Copyright 2002-2004 by David Brownell |
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* All Rights Reserved. |
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* |
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* This software is licensed under the GNU GPL version 2. |
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*/ |
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#ifndef __LINUX_USB_GADGET_H |
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#define __LINUX_USB_GADGET_H |
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#include <linux/device.h> |
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#include <linux/errno.h> |
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#include <linux/init.h> |
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#include <linux/list.h> |
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#include <linux/slab.h> |
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#include <linux/scatterlist.h> |
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#include <linux/types.h> |
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#include <linux/workqueue.h> |
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#include <linux/usb/ch9.h> |
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#define UDC_TRACE_STR_MAX 512 |
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struct usb_ep; |
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/** |
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* struct usb_request - describes one i/o request |
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* @buf: Buffer used for data. Always provide this; some controllers |
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* only use PIO, or don't use DMA for some endpoints. |
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* @dma: DMA address corresponding to 'buf'. If you don't set this |
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* field, and the usb controller needs one, it is responsible |
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* for mapping and unmapping the buffer. |
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* @sg: a scatterlist for SG-capable controllers. |
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* @num_sgs: number of SG entries |
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* @num_mapped_sgs: number of SG entries mapped to DMA (internal) |
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* @length: Length of that data |
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* @stream_id: The stream id, when USB3.0 bulk streams are being used |
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* @is_last: Indicates if this is the last request of a stream_id before |
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* switching to a different stream (required for DWC3 controllers). |
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* @no_interrupt: If true, hints that no completion irq is needed. |
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* Helpful sometimes with deep request queues that are handled |
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* directly by DMA controllers. |
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* @zero: If true, when writing data, makes the last packet be "short" |
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* by adding a zero length packet as needed; |
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* @short_not_ok: When reading data, makes short packets be |
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* treated as errors (queue stops advancing till cleanup). |
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* @dma_mapped: Indicates if request has been mapped to DMA (internal) |
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* @complete: Function called when request completes, so this request and |
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* its buffer may be re-used. The function will always be called with |
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* interrupts disabled, and it must not sleep. |
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* Reads terminate with a short packet, or when the buffer fills, |
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* whichever comes first. When writes terminate, some data bytes |
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* will usually still be in flight (often in a hardware fifo). |
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* Errors (for reads or writes) stop the queue from advancing |
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* until the completion function returns, so that any transfers |
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* invalidated by the error may first be dequeued. |
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* @context: For use by the completion callback |
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* @list: For use by the gadget driver. |
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* @frame_number: Reports the interval number in (micro)frame in which the |
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* isochronous transfer was transmitted or received. |
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* @status: Reports completion code, zero or a negative errno. |
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* Normally, faults block the transfer queue from advancing until |
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* the completion callback returns. |
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* Code "-ESHUTDOWN" indicates completion caused by device disconnect, |
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* or when the driver disabled the endpoint. |
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* @actual: Reports bytes transferred to/from the buffer. For reads (OUT |
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* transfers) this may be less than the requested length. If the |
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* short_not_ok flag is set, short reads are treated as errors |
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* even when status otherwise indicates successful completion. |
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* Note that for writes (IN transfers) some data bytes may still |
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* reside in a device-side FIFO when the request is reported as |
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* complete. |
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* |
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* These are allocated/freed through the endpoint they're used with. The |
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* hardware's driver can add extra per-request data to the memory it returns, |
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* which often avoids separate memory allocations (potential failures), |
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* later when the request is queued. |
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* |
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* Request flags affect request handling, such as whether a zero length |
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* packet is written (the "zero" flag), whether a short read should be |
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* treated as an error (blocking request queue advance, the "short_not_ok" |
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* flag), or hinting that an interrupt is not required (the "no_interrupt" |
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* flag, for use with deep request queues). |
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* |
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* Bulk endpoints can use any size buffers, and can also be used for interrupt |
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* transfers. interrupt-only endpoints can be much less functional. |
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* |
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* NOTE: this is analogous to 'struct urb' on the host side, except that |
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* it's thinner and promotes more pre-allocation. |
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*/ |
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struct usb_request { |
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void *buf; |
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unsigned length; |
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dma_addr_t dma; |
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struct scatterlist *sg; |
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unsigned num_sgs; |
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unsigned num_mapped_sgs; |
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unsigned stream_id:16; |
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unsigned is_last:1; |
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unsigned no_interrupt:1; |
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unsigned zero:1; |
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unsigned short_not_ok:1; |
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unsigned dma_mapped:1; |
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void (*complete)(struct usb_ep *ep, |
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struct usb_request *req); |
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void *context; |
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struct list_head list; |
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unsigned frame_number; /* ISO ONLY */ |
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int status; |
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unsigned actual; |
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}; |
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/*-------------------------------------------------------------------------*/ |
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/* endpoint-specific parts of the api to the usb controller hardware. |
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* unlike the urb model, (de)multiplexing layers are not required. |
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* (so this api could slash overhead if used on the host side...) |
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* |
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* note that device side usb controllers commonly differ in how many |
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* endpoints they support, as well as their capabilities. |
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*/ |
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struct usb_ep_ops { |
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int (*enable) (struct usb_ep *ep, |
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const struct usb_endpoint_descriptor *desc); |
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int (*disable) (struct usb_ep *ep); |
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void (*dispose) (struct usb_ep *ep); |
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struct usb_request *(*alloc_request) (struct usb_ep *ep, |
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gfp_t gfp_flags); |
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void (*free_request) (struct usb_ep *ep, struct usb_request *req); |
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int (*queue) (struct usb_ep *ep, struct usb_request *req, |
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gfp_t gfp_flags); |
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int (*dequeue) (struct usb_ep *ep, struct usb_request *req); |
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int (*set_halt) (struct usb_ep *ep, int value); |
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int (*set_wedge) (struct usb_ep *ep); |
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int (*fifo_status) (struct usb_ep *ep); |
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void (*fifo_flush) (struct usb_ep *ep); |
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}; |
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/** |
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* struct usb_ep_caps - endpoint capabilities description |
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* @type_control:Endpoint supports control type (reserved for ep0). |
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* @type_iso:Endpoint supports isochronous transfers. |
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* @type_bulk:Endpoint supports bulk transfers. |
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* @type_int:Endpoint supports interrupt transfers. |
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* @dir_in:Endpoint supports IN direction. |
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* @dir_out:Endpoint supports OUT direction. |
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*/ |
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struct usb_ep_caps { |
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unsigned type_control:1; |
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unsigned type_iso:1; |
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unsigned type_bulk:1; |
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unsigned type_int:1; |
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unsigned dir_in:1; |
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unsigned dir_out:1; |
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}; |
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#define USB_EP_CAPS_TYPE_CONTROL 0x01 |
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#define USB_EP_CAPS_TYPE_ISO 0x02 |
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#define USB_EP_CAPS_TYPE_BULK 0x04 |
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#define USB_EP_CAPS_TYPE_INT 0x08 |
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#define USB_EP_CAPS_TYPE_ALL \ |
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(USB_EP_CAPS_TYPE_ISO | USB_EP_CAPS_TYPE_BULK | USB_EP_CAPS_TYPE_INT) |
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#define USB_EP_CAPS_DIR_IN 0x01 |
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#define USB_EP_CAPS_DIR_OUT 0x02 |
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#define USB_EP_CAPS_DIR_ALL (USB_EP_CAPS_DIR_IN | USB_EP_CAPS_DIR_OUT) |
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#define USB_EP_CAPS(_type, _dir) \ |
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{ \ |
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.type_control = !!(_type & USB_EP_CAPS_TYPE_CONTROL), \ |
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.type_iso = !!(_type & USB_EP_CAPS_TYPE_ISO), \ |
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.type_bulk = !!(_type & USB_EP_CAPS_TYPE_BULK), \ |
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.type_int = !!(_type & USB_EP_CAPS_TYPE_INT), \ |
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.dir_in = !!(_dir & USB_EP_CAPS_DIR_IN), \ |
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.dir_out = !!(_dir & USB_EP_CAPS_DIR_OUT), \ |
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} |
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/** |
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* struct usb_ep - device side representation of USB endpoint |
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* @name:identifier for the endpoint, such as "ep-a" or "ep9in-bulk" |
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* @ops: Function pointers used to access hardware-specific operations. |
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* @ep_list:the gadget's ep_list holds all of its endpoints |
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* @caps:The structure describing types and directions supported by endoint. |
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* @enabled: The current endpoint enabled/disabled state. |
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* @claimed: True if this endpoint is claimed by a function. |
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* @maxpacket:The maximum packet size used on this endpoint. The initial |
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* value can sometimes be reduced (hardware allowing), according to |
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* the endpoint descriptor used to configure the endpoint. |
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* @maxpacket_limit:The maximum packet size value which can be handled by this |
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* endpoint. It's set once by UDC driver when endpoint is initialized, and |
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* should not be changed. Should not be confused with maxpacket. |
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* @max_streams: The maximum number of streams supported |
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* by this EP (0 - 16, actual number is 2^n) |
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* @mult: multiplier, 'mult' value for SS Isoc EPs |
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* @maxburst: the maximum number of bursts supported by this EP (for usb3) |
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* @driver_data:for use by the gadget driver. |
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* @address: used to identify the endpoint when finding descriptor that |
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* matches connection speed |
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* @desc: endpoint descriptor. This pointer is set before the endpoint is |
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* enabled and remains valid until the endpoint is disabled. |
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* @comp_desc: In case of SuperSpeed support, this is the endpoint companion |
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* descriptor that is used to configure the endpoint |
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* |
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* the bus controller driver lists all the general purpose endpoints in |
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* gadget->ep_list. the control endpoint (gadget->ep0) is not in that list, |
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* and is accessed only in response to a driver setup() callback. |
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*/ |
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struct usb_ep { |
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void *driver_data; |
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const char *name; |
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const struct usb_ep_ops *ops; |
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struct list_head ep_list; |
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struct usb_ep_caps caps; |
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bool claimed; |
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bool enabled; |
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unsigned maxpacket:16; |
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unsigned maxpacket_limit:16; |
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unsigned max_streams:16; |
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unsigned mult:2; |
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unsigned maxburst:5; |
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u8 address; |
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const struct usb_endpoint_descriptor *desc; |
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const struct usb_ss_ep_comp_descriptor *comp_desc; |
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}; |
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/*-------------------------------------------------------------------------*/ |
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#if IS_ENABLED(CONFIG_USB_GADGET) |
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void usb_ep_set_maxpacket_limit(struct usb_ep *ep, unsigned maxpacket_limit); |
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int usb_ep_enable(struct usb_ep *ep); |
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int usb_ep_disable(struct usb_ep *ep); |
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struct usb_request *usb_ep_alloc_request(struct usb_ep *ep, gfp_t gfp_flags); |
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void usb_ep_free_request(struct usb_ep *ep, struct usb_request *req); |
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int usb_ep_queue(struct usb_ep *ep, struct usb_request *req, gfp_t gfp_flags); |
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int usb_ep_dequeue(struct usb_ep *ep, struct usb_request *req); |
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int usb_ep_set_halt(struct usb_ep *ep); |
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int usb_ep_clear_halt(struct usb_ep *ep); |
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int usb_ep_set_wedge(struct usb_ep *ep); |
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int usb_ep_fifo_status(struct usb_ep *ep); |
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void usb_ep_fifo_flush(struct usb_ep *ep); |
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#else |
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static inline void usb_ep_set_maxpacket_limit(struct usb_ep *ep, |
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unsigned maxpacket_limit) |
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{ } |
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static inline int usb_ep_enable(struct usb_ep *ep) |
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{ return 0; } |
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static inline int usb_ep_disable(struct usb_ep *ep) |
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{ return 0; } |
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static inline struct usb_request *usb_ep_alloc_request(struct usb_ep *ep, |
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gfp_t gfp_flags) |
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{ return NULL; } |
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static inline void usb_ep_free_request(struct usb_ep *ep, |
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struct usb_request *req) |
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{ } |
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static inline int usb_ep_queue(struct usb_ep *ep, struct usb_request *req, |
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gfp_t gfp_flags) |
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{ return 0; } |
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static inline int usb_ep_dequeue(struct usb_ep *ep, struct usb_request *req) |
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{ return 0; } |
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static inline int usb_ep_set_halt(struct usb_ep *ep) |
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{ return 0; } |
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static inline int usb_ep_clear_halt(struct usb_ep *ep) |
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{ return 0; } |
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static inline int usb_ep_set_wedge(struct usb_ep *ep) |
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{ return 0; } |
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static inline int usb_ep_fifo_status(struct usb_ep *ep) |
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{ return 0; } |
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static inline void usb_ep_fifo_flush(struct usb_ep *ep) |
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{ } |
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#endif /* USB_GADGET */ |
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/*-------------------------------------------------------------------------*/ |
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struct usb_dcd_config_params { |
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__u8 bU1devExitLat; /* U1 Device exit Latency */ |
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#define USB_DEFAULT_U1_DEV_EXIT_LAT 0x01 /* Less then 1 microsec */ |
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__le16 bU2DevExitLat; /* U2 Device exit Latency */ |
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#define USB_DEFAULT_U2_DEV_EXIT_LAT 0x1F4 /* Less then 500 microsec */ |
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__u8 besl_baseline; /* Recommended baseline BESL (0-15) */ |
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__u8 besl_deep; /* Recommended deep BESL (0-15) */ |
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#define USB_DEFAULT_BESL_UNSPECIFIED 0xFF /* No recommended value */ |
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}; |
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struct usb_gadget; |
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struct usb_gadget_driver; |
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struct usb_udc; |
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/* the rest of the api to the controller hardware: device operations, |
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* which don't involve endpoints (or i/o). |
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*/ |
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struct usb_gadget_ops { |
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int (*get_frame)(struct usb_gadget *); |
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int (*wakeup)(struct usb_gadget *); |
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int (*set_selfpowered) (struct usb_gadget *, int is_selfpowered); |
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int (*vbus_session) (struct usb_gadget *, int is_active); |
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int (*vbus_draw) (struct usb_gadget *, unsigned mA); |
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int (*pullup) (struct usb_gadget *, int is_on); |
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int (*ioctl)(struct usb_gadget *, |
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unsigned code, unsigned long param); |
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void (*get_config_params)(struct usb_gadget *, |
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struct usb_dcd_config_params *); |
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int (*udc_start)(struct usb_gadget *, |
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struct usb_gadget_driver *); |
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int (*udc_stop)(struct usb_gadget *); |
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void (*udc_set_speed)(struct usb_gadget *, enum usb_device_speed); |
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void (*udc_set_ssp_rate)(struct usb_gadget *gadget, |
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enum usb_ssp_rate rate); |
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struct usb_ep *(*match_ep)(struct usb_gadget *, |
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struct usb_endpoint_descriptor *, |
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struct usb_ss_ep_comp_descriptor *); |
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}; |
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/** |
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* struct usb_gadget - represents a usb device |
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* @work: (internal use) Workqueue to be used for sysfs_notify() |
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* @udc: struct usb_udc pointer for this gadget |
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* @ops: Function pointers used to access hardware-specific operations. |
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* @ep0: Endpoint zero, used when reading or writing responses to |
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* driver setup() requests |
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* @ep_list: List of other endpoints supported by the device. |
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* @speed: Speed of current connection to USB host. |
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* @max_speed: Maximal speed the UDC can handle. UDC must support this |
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* and all slower speeds. |
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* @ssp_rate: Current connected SuperSpeed Plus signaling rate and lane count. |
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* @max_ssp_rate: Maximum SuperSpeed Plus signaling rate and lane count the UDC |
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* can handle. The UDC must support this and all slower speeds and lower |
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* number of lanes. |
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* @state: the state we are now (attached, suspended, configured, etc) |
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* @name: Identifies the controller hardware type. Used in diagnostics |
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* and sometimes configuration. |
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* @dev: Driver model state for this abstract device. |
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* @isoch_delay: value from Set Isoch Delay request. Only valid on SS/SSP |
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* @out_epnum: last used out ep number |
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* @in_epnum: last used in ep number |
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* @mA: last set mA value |
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* @otg_caps: OTG capabilities of this gadget. |
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* @sg_supported: true if we can handle scatter-gather |
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* @is_otg: True if the USB device port uses a Mini-AB jack, so that the |
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* gadget driver must provide a USB OTG descriptor. |
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* @is_a_peripheral: False unless is_otg, the "A" end of a USB cable |
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* is in the Mini-AB jack, and HNP has been used to switch roles |
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* so that the "A" device currently acts as A-Peripheral, not A-Host. |
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* @a_hnp_support: OTG device feature flag, indicating that the A-Host |
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* supports HNP at this port. |
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* @a_alt_hnp_support: OTG device feature flag, indicating that the A-Host |
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* only supports HNP on a different root port. |
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* @b_hnp_enable: OTG device feature flag, indicating that the A-Host |
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* enabled HNP support. |
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* @hnp_polling_support: OTG device feature flag, indicating if the OTG device |
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* in peripheral mode can support HNP polling. |
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* @host_request_flag: OTG device feature flag, indicating if A-Peripheral |
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* or B-Peripheral wants to take host role. |
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* @quirk_ep_out_aligned_size: epout requires buffer size to be aligned to |
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* MaxPacketSize. |
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* @quirk_altset_not_supp: UDC controller doesn't support alt settings. |
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* @quirk_stall_not_supp: UDC controller doesn't support stalling. |
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* @quirk_zlp_not_supp: UDC controller doesn't support ZLP. |
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* @quirk_avoids_skb_reserve: udc/platform wants to avoid skb_reserve() in |
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* u_ether.c to improve performance. |
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* @is_selfpowered: if the gadget is self-powered. |
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* @deactivated: True if gadget is deactivated - in deactivated state it cannot |
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* be connected. |
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* @connected: True if gadget is connected. |
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* @lpm_capable: If the gadget max_speed is FULL or HIGH, this flag |
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* indicates that it supports LPM as per the LPM ECN & errata. |
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* @irq: the interrupt number for device controller. |
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* |
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* Gadgets have a mostly-portable "gadget driver" implementing device |
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* functions, handling all usb configurations and interfaces. Gadget |
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* drivers talk to hardware-specific code indirectly, through ops vectors. |
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* That insulates the gadget driver from hardware details, and packages |
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* the hardware endpoints through generic i/o queues. The "usb_gadget" |
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* and "usb_ep" interfaces provide that insulation from the hardware. |
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* |
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* Except for the driver data, all fields in this structure are |
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* read-only to the gadget driver. That driver data is part of the |
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* "driver model" infrastructure in 2.6 (and later) kernels, and for |
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* earlier systems is grouped in a similar structure that's not known |
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* to the rest of the kernel. |
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* |
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* Values of the three OTG device feature flags are updated before the |
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* setup() call corresponding to USB_REQ_SET_CONFIGURATION, and before |
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* driver suspend() calls. They are valid only when is_otg, and when the |
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* device is acting as a B-Peripheral (so is_a_peripheral is false). |
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*/ |
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struct usb_gadget { |
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struct work_struct work; |
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struct usb_udc *udc; |
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/* readonly to gadget driver */ |
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const struct usb_gadget_ops *ops; |
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struct usb_ep *ep0; |
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struct list_head ep_list; /* of usb_ep */ |
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enum usb_device_speed speed; |
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enum usb_device_speed max_speed; |
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/* USB SuperSpeed Plus only */ |
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enum usb_ssp_rate ssp_rate; |
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enum usb_ssp_rate max_ssp_rate; |
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enum usb_device_state state; |
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const char *name; |
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struct device dev; |
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unsigned isoch_delay; |
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unsigned out_epnum; |
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unsigned in_epnum; |
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unsigned mA; |
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struct usb_otg_caps *otg_caps; |
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unsigned sg_supported:1; |
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unsigned is_otg:1; |
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unsigned is_a_peripheral:1; |
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unsigned b_hnp_enable:1; |
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unsigned a_hnp_support:1; |
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unsigned a_alt_hnp_support:1; |
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unsigned hnp_polling_support:1; |
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unsigned host_request_flag:1; |
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unsigned quirk_ep_out_aligned_size:1; |
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unsigned quirk_altset_not_supp:1; |
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unsigned quirk_stall_not_supp:1; |
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unsigned quirk_zlp_not_supp:1; |
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unsigned quirk_avoids_skb_reserve:1; |
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unsigned is_selfpowered:1; |
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unsigned deactivated:1; |
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unsigned connected:1; |
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unsigned lpm_capable:1; |
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int irq; |
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}; |
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#define work_to_gadget(w) (container_of((w), struct usb_gadget, work)) |
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|
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/* Interface to the device model */ |
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static inline void set_gadget_data(struct usb_gadget *gadget, void *data) |
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{ dev_set_drvdata(&gadget->dev, data); } |
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static inline void *get_gadget_data(struct usb_gadget *gadget) |
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{ return dev_get_drvdata(&gadget->dev); } |
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static inline struct usb_gadget *dev_to_usb_gadget(struct device *dev) |
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{ |
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return container_of(dev, struct usb_gadget, dev); |
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} |
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static inline struct usb_gadget *usb_get_gadget(struct usb_gadget *gadget) |
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{ |
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get_device(&gadget->dev); |
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return gadget; |
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} |
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static inline void usb_put_gadget(struct usb_gadget *gadget) |
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{ |
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put_device(&gadget->dev); |
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} |
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extern void usb_initialize_gadget(struct device *parent, |
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struct usb_gadget *gadget, void (*release)(struct device *dev)); |
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extern int usb_add_gadget(struct usb_gadget *gadget); |
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extern void usb_del_gadget(struct usb_gadget *gadget); |
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|
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/* Legacy device-model interface */ |
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extern int usb_add_gadget_udc_release(struct device *parent, |
|
struct usb_gadget *gadget, void (*release)(struct device *dev)); |
|
extern int usb_add_gadget_udc(struct device *parent, struct usb_gadget *gadget); |
|
extern void usb_del_gadget_udc(struct usb_gadget *gadget); |
|
extern char *usb_get_gadget_udc_name(void); |
|
|
|
/* iterates the non-control endpoints; 'tmp' is a struct usb_ep pointer */ |
|
#define gadget_for_each_ep(tmp, gadget) \ |
|
list_for_each_entry(tmp, &(gadget)->ep_list, ep_list) |
|
|
|
/** |
|
* usb_ep_align - returns @len aligned to ep's maxpacketsize. |
|
* @ep: the endpoint whose maxpacketsize is used to align @len |
|
* @len: buffer size's length to align to @ep's maxpacketsize |
|
* |
|
* This helper is used to align buffer's size to an ep's maxpacketsize. |
|
*/ |
|
static inline size_t usb_ep_align(struct usb_ep *ep, size_t len) |
|
{ |
|
int max_packet_size = (size_t)usb_endpoint_maxp(ep->desc) & 0x7ff; |
|
|
|
return round_up(len, max_packet_size); |
|
} |
|
|
|
/** |
|
* usb_ep_align_maybe - returns @len aligned to ep's maxpacketsize if gadget |
|
* requires quirk_ep_out_aligned_size, otherwise returns len. |
|
* @g: controller to check for quirk |
|
* @ep: the endpoint whose maxpacketsize is used to align @len |
|
* @len: buffer size's length to align to @ep's maxpacketsize |
|
* |
|
* This helper is used in case it's required for any reason to check and maybe |
|
* align buffer's size to an ep's maxpacketsize. |
|
*/ |
|
static inline size_t |
|
usb_ep_align_maybe(struct usb_gadget *g, struct usb_ep *ep, size_t len) |
|
{ |
|
return g->quirk_ep_out_aligned_size ? usb_ep_align(ep, len) : len; |
|
} |
|
|
|
/** |
|
* gadget_is_altset_supported - return true iff the hardware supports |
|
* altsettings |
|
* @g: controller to check for quirk |
|
*/ |
|
static inline int gadget_is_altset_supported(struct usb_gadget *g) |
|
{ |
|
return !g->quirk_altset_not_supp; |
|
} |
|
|
|
/** |
|
* gadget_is_stall_supported - return true iff the hardware supports stalling |
|
* @g: controller to check for quirk |
|
*/ |
|
static inline int gadget_is_stall_supported(struct usb_gadget *g) |
|
{ |
|
return !g->quirk_stall_not_supp; |
|
} |
|
|
|
/** |
|
* gadget_is_zlp_supported - return true iff the hardware supports zlp |
|
* @g: controller to check for quirk |
|
*/ |
|
static inline int gadget_is_zlp_supported(struct usb_gadget *g) |
|
{ |
|
return !g->quirk_zlp_not_supp; |
|
} |
|
|
|
/** |
|
* gadget_avoids_skb_reserve - return true iff the hardware would like to avoid |
|
* skb_reserve to improve performance. |
|
* @g: controller to check for quirk |
|
*/ |
|
static inline int gadget_avoids_skb_reserve(struct usb_gadget *g) |
|
{ |
|
return g->quirk_avoids_skb_reserve; |
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} |
|
|
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/** |
|
* gadget_is_dualspeed - return true iff the hardware handles high speed |
|
* @g: controller that might support both high and full speeds |
|
*/ |
|
static inline int gadget_is_dualspeed(struct usb_gadget *g) |
|
{ |
|
return g->max_speed >= USB_SPEED_HIGH; |
|
} |
|
|
|
/** |
|
* 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; |
|
} |
|
|
|
/** |
|
* gadget_is_superspeed_plus() - return true if the hardware handles |
|
* superspeed plus |
|
* @g: controller that might support superspeed plus |
|
*/ |
|
static inline int gadget_is_superspeed_plus(struct usb_gadget *g) |
|
{ |
|
return g->max_speed >= USB_SPEED_SUPER_PLUS; |
|
} |
|
|
|
/** |
|
* gadget_is_otg - return true iff the hardware is OTG-ready |
|
* @g: controller that might have a Mini-AB connector |
|
* |
|
* This is a runtime test, since kernels with a USB-OTG stack sometimes |
|
* run on boards which only have a Mini-B (or Mini-A) connector. |
|
*/ |
|
static inline int gadget_is_otg(struct usb_gadget *g) |
|
{ |
|
#ifdef CONFIG_USB_OTG |
|
return g->is_otg; |
|
#else |
|
return 0; |
|
#endif |
|
} |
|
|
|
/*-------------------------------------------------------------------------*/ |
|
|
|
#if IS_ENABLED(CONFIG_USB_GADGET) |
|
int usb_gadget_frame_number(struct usb_gadget *gadget); |
|
int usb_gadget_wakeup(struct usb_gadget *gadget); |
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int usb_gadget_set_selfpowered(struct usb_gadget *gadget); |
|
int usb_gadget_clear_selfpowered(struct usb_gadget *gadget); |
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int usb_gadget_vbus_connect(struct usb_gadget *gadget); |
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int usb_gadget_vbus_draw(struct usb_gadget *gadget, unsigned mA); |
|
int usb_gadget_vbus_disconnect(struct usb_gadget *gadget); |
|
int usb_gadget_connect(struct usb_gadget *gadget); |
|
int usb_gadget_disconnect(struct usb_gadget *gadget); |
|
int usb_gadget_deactivate(struct usb_gadget *gadget); |
|
int usb_gadget_activate(struct usb_gadget *gadget); |
|
#else |
|
static inline int usb_gadget_frame_number(struct usb_gadget *gadget) |
|
{ return 0; } |
|
static inline int usb_gadget_wakeup(struct usb_gadget *gadget) |
|
{ return 0; } |
|
static inline int usb_gadget_set_selfpowered(struct usb_gadget *gadget) |
|
{ return 0; } |
|
static inline int usb_gadget_clear_selfpowered(struct usb_gadget *gadget) |
|
{ return 0; } |
|
static inline int usb_gadget_vbus_connect(struct usb_gadget *gadget) |
|
{ return 0; } |
|
static inline int usb_gadget_vbus_draw(struct usb_gadget *gadget, unsigned mA) |
|
{ return 0; } |
|
static inline int usb_gadget_vbus_disconnect(struct usb_gadget *gadget) |
|
{ return 0; } |
|
static inline int usb_gadget_connect(struct usb_gadget *gadget) |
|
{ return 0; } |
|
static inline int usb_gadget_disconnect(struct usb_gadget *gadget) |
|
{ return 0; } |
|
static inline int usb_gadget_deactivate(struct usb_gadget *gadget) |
|
{ return 0; } |
|
static inline int usb_gadget_activate(struct usb_gadget *gadget) |
|
{ return 0; } |
|
#endif /* CONFIG_USB_GADGET */ |
|
|
|
/*-------------------------------------------------------------------------*/ |
|
|
|
/** |
|
* struct usb_gadget_driver - driver for usb gadget devices |
|
* @function: String describing the gadget's function |
|
* @max_speed: Highest speed the driver handles. |
|
* @setup: Invoked for ep0 control requests that aren't handled by |
|
* the hardware level driver. Most calls must be handled by |
|
* the gadget driver, including descriptor and configuration |
|
* management. The 16 bit members of the setup data are in |
|
* USB byte order. Called in_interrupt; this may not sleep. Driver |
|
* queues a response to ep0, or returns negative to stall. |
|
* @disconnect: Invoked after all transfers have been stopped, |
|
* when the host is disconnected. May be called in_interrupt; this |
|
* may not sleep. Some devices can't detect disconnect, so this might |
|
* not be called except as part of controller shutdown. |
|
* @bind: the driver's bind callback |
|
* @unbind: Invoked when the driver is unbound from a gadget, |
|
* usually from rmmod (after a disconnect is reported). |
|
* Called in a context that permits sleeping. |
|
* @suspend: Invoked on USB suspend. May be called in_interrupt. |
|
* @resume: Invoked on USB resume. May be called in_interrupt. |
|
* @reset: Invoked on USB bus reset. It is mandatory for all gadget drivers |
|
* and should be called in_interrupt. |
|
* @driver: Driver model state for this driver. |
|
* @udc_name: A name of UDC this driver should be bound to. If udc_name is NULL, |
|
* this driver will be bound to any available UDC. |
|
* @pending: UDC core private data used for deferred probe of this driver. |
|
* @match_existing_only: If udc is not found, return an error and don't add this |
|
* gadget driver to list of pending driver |
|
* |
|
* Devices are disabled till a gadget driver successfully bind()s, which |
|
* means the driver will handle setup() requests needed to enumerate (and |
|
* meet "chapter 9" requirements) then do some useful work. |
|
* |
|
* If gadget->is_otg is true, the gadget driver must provide an OTG |
|
* descriptor during enumeration, or else fail the bind() call. In such |
|
* cases, no USB traffic may flow until both bind() returns without |
|
* having called usb_gadget_disconnect(), and the USB host stack has |
|
* initialized. |
|
* |
|
* Drivers use hardware-specific knowledge to configure the usb hardware. |
|
* endpoint addressing is only one of several hardware characteristics that |
|
* are in descriptors the ep0 implementation returns from setup() calls. |
|
* |
|
* Except for ep0 implementation, most driver code shouldn't need change to |
|
* run on top of different usb controllers. It'll use endpoints set up by |
|
* that ep0 implementation. |
|
* |
|
* The usb controller driver handles a few standard usb requests. Those |
|
* include set_address, and feature flags for devices, interfaces, and |
|
* endpoints (the get_status, set_feature, and clear_feature requests). |
|
* |
|
* Accordingly, the driver's setup() callback must always implement all |
|
* get_descriptor requests, returning at least a device descriptor and |
|
* a configuration descriptor. Drivers must make sure the endpoint |
|
* descriptors match any hardware constraints. Some hardware also constrains |
|
* other descriptors. (The pxa250 allows only configurations 1, 2, or 3). |
|
* |
|
* The driver's setup() callback must also implement set_configuration, |
|
* and should also implement set_interface, get_configuration, and |
|
* get_interface. Setting a configuration (or interface) is where |
|
* endpoints should be activated or (config 0) shut down. |
|
* |
|
* (Note that only the default control endpoint is supported. Neither |
|
* hosts nor devices generally support control traffic except to ep0.) |
|
* |
|
* Most devices will ignore USB suspend/resume operations, and so will |
|
* not provide those callbacks. However, some may need to change modes |
|
* when the host is not longer directing those activities. For example, |
|
* local controls (buttons, dials, etc) may need to be re-enabled since |
|
* the (remote) host can't do that any longer; or an error state might |
|
* be cleared, to make the device behave identically whether or not |
|
* power is maintained. |
|
*/ |
|
struct usb_gadget_driver { |
|
char *function; |
|
enum usb_device_speed max_speed; |
|
int (*bind)(struct usb_gadget *gadget, |
|
struct usb_gadget_driver *driver); |
|
void (*unbind)(struct usb_gadget *); |
|
int (*setup)(struct usb_gadget *, |
|
const struct usb_ctrlrequest *); |
|
void (*disconnect)(struct usb_gadget *); |
|
void (*suspend)(struct usb_gadget *); |
|
void (*resume)(struct usb_gadget *); |
|
void (*reset)(struct usb_gadget *); |
|
|
|
/* FIXME support safe rmmod */ |
|
struct device_driver driver; |
|
|
|
char *udc_name; |
|
struct list_head pending; |
|
unsigned match_existing_only:1; |
|
}; |
|
|
|
|
|
|
|
/*-------------------------------------------------------------------------*/ |
|
|
|
/* driver modules register and unregister, as usual. |
|
* these calls must be made in a context that can sleep. |
|
* |
|
* these will usually be implemented directly by the hardware-dependent |
|
* usb bus interface driver, which will only support a single driver. |
|
*/ |
|
|
|
/** |
|
* usb_gadget_probe_driver - probe a gadget driver |
|
* @driver: the driver being registered |
|
* Context: can sleep |
|
* |
|
* Call this in your gadget driver's module initialization function, |
|
* to tell the underlying usb controller driver about your driver. |
|
* The @bind() function will be called to bind it to a gadget before this |
|
* registration call returns. It's expected that the @bind() function will |
|
* be in init sections. |
|
*/ |
|
int usb_gadget_probe_driver(struct usb_gadget_driver *driver); |
|
|
|
/** |
|
* usb_gadget_unregister_driver - unregister a gadget driver |
|
* @driver:the driver being unregistered |
|
* Context: can sleep |
|
* |
|
* Call this in your gadget driver's module cleanup function, |
|
* to tell the underlying usb controller that your driver is |
|
* going away. If the controller is connected to a USB host, |
|
* it will first disconnect(). The driver is also requested |
|
* to unbind() and clean up any device state, before this procedure |
|
* finally returns. It's expected that the unbind() functions |
|
* will be in exit sections, so may not be linked in some kernels. |
|
*/ |
|
int usb_gadget_unregister_driver(struct usb_gadget_driver *driver); |
|
|
|
/*-------------------------------------------------------------------------*/ |
|
|
|
/* utility to simplify dealing with string descriptors */ |
|
|
|
/** |
|
* struct usb_string - wraps a C string and its USB id |
|
* @id:the (nonzero) ID for this string |
|
* @s:the string, in UTF-8 encoding |
|
* |
|
* If you're using usb_gadget_get_string(), use this to wrap a string |
|
* together with its ID. |
|
*/ |
|
struct usb_string { |
|
u8 id; |
|
const char *s; |
|
}; |
|
|
|
/** |
|
* struct usb_gadget_strings - a set of USB strings in a given language |
|
* @language:identifies the strings' language (0x0409 for en-us) |
|
* @strings:array of strings with their ids |
|
* |
|
* If you're using usb_gadget_get_string(), use this to wrap all the |
|
* strings for a given language. |
|
*/ |
|
struct usb_gadget_strings { |
|
u16 language; /* 0x0409 for en-us */ |
|
struct usb_string *strings; |
|
}; |
|
|
|
struct usb_gadget_string_container { |
|
struct list_head list; |
|
u8 *stash[]; |
|
}; |
|
|
|
/* put descriptor for string with that id into buf (buflen >= 256) */ |
|
int usb_gadget_get_string(const struct usb_gadget_strings *table, int id, u8 *buf); |
|
|
|
/* check if the given language identifier is valid */ |
|
bool usb_validate_langid(u16 langid); |
|
|
|
/*-------------------------------------------------------------------------*/ |
|
|
|
/* utility to simplify managing config descriptors */ |
|
|
|
/* write vector of descriptors into buffer */ |
|
int usb_descriptor_fillbuf(void *, unsigned, |
|
const struct usb_descriptor_header **); |
|
|
|
/* build config descriptor from single descriptor vector */ |
|
int usb_gadget_config_buf(const struct usb_config_descriptor *config, |
|
void *buf, unsigned buflen, const struct usb_descriptor_header **desc); |
|
|
|
/* copy a NULL-terminated vector of descriptors */ |
|
struct usb_descriptor_header **usb_copy_descriptors( |
|
struct usb_descriptor_header **); |
|
|
|
/** |
|
* usb_free_descriptors - free descriptors returned by usb_copy_descriptors() |
|
* @v: vector of descriptors |
|
*/ |
|
static inline void usb_free_descriptors(struct usb_descriptor_header **v) |
|
{ |
|
kfree(v); |
|
} |
|
|
|
struct usb_function; |
|
int usb_assign_descriptors(struct usb_function *f, |
|
struct usb_descriptor_header **fs, |
|
struct usb_descriptor_header **hs, |
|
struct usb_descriptor_header **ss, |
|
struct usb_descriptor_header **ssp); |
|
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 */ |
|
|
|
#ifdef CONFIG_HAS_DMA |
|
extern int usb_gadget_map_request_by_dev(struct device *dev, |
|
struct usb_request *req, int is_in); |
|
extern int usb_gadget_map_request(struct usb_gadget *gadget, |
|
struct usb_request *req, int is_in); |
|
|
|
extern void usb_gadget_unmap_request_by_dev(struct device *dev, |
|
struct usb_request *req, int is_in); |
|
extern void usb_gadget_unmap_request(struct usb_gadget *gadget, |
|
struct usb_request *req, int is_in); |
|
#else /* !CONFIG_HAS_DMA */ |
|
static inline int usb_gadget_map_request_by_dev(struct device *dev, |
|
struct usb_request *req, int is_in) { return -ENOSYS; } |
|
static inline int usb_gadget_map_request(struct usb_gadget *gadget, |
|
struct usb_request *req, int is_in) { return -ENOSYS; } |
|
|
|
static inline void usb_gadget_unmap_request_by_dev(struct device *dev, |
|
struct usb_request *req, int is_in) { } |
|
static inline void usb_gadget_unmap_request(struct usb_gadget *gadget, |
|
struct usb_request *req, int is_in) { } |
|
#endif /* !CONFIG_HAS_DMA */ |
|
|
|
/*-------------------------------------------------------------------------*/ |
|
|
|
/* utility to set gadget state properly */ |
|
|
|
extern void usb_gadget_set_state(struct usb_gadget *gadget, |
|
enum usb_device_state state); |
|
|
|
/*-------------------------------------------------------------------------*/ |
|
|
|
/* utility to tell udc core that the bus reset occurs */ |
|
extern void usb_gadget_udc_reset(struct usb_gadget *gadget, |
|
struct usb_gadget_driver *driver); |
|
|
|
/*-------------------------------------------------------------------------*/ |
|
|
|
/* utility to give requests back to the gadget layer */ |
|
|
|
extern void usb_gadget_giveback_request(struct usb_ep *ep, |
|
struct usb_request *req); |
|
|
|
/*-------------------------------------------------------------------------*/ |
|
|
|
/* utility to find endpoint by name */ |
|
|
|
extern struct usb_ep *gadget_find_ep_by_name(struct usb_gadget *g, |
|
const char *name); |
|
|
|
/*-------------------------------------------------------------------------*/ |
|
|
|
/* utility to check if endpoint caps match descriptor needs */ |
|
|
|
extern int usb_gadget_ep_match_desc(struct usb_gadget *gadget, |
|
struct usb_ep *ep, struct usb_endpoint_descriptor *desc, |
|
struct usb_ss_ep_comp_descriptor *ep_comp); |
|
|
|
/*-------------------------------------------------------------------------*/ |
|
|
|
/* utility to update vbus status for udc core, it may be scheduled */ |
|
extern void usb_udc_vbus_handler(struct usb_gadget *gadget, bool status); |
|
|
|
/*-------------------------------------------------------------------------*/ |
|
|
|
/* utility wrapping a simple endpoint selection policy */ |
|
|
|
extern struct usb_ep *usb_ep_autoconfig(struct usb_gadget *, |
|
struct usb_endpoint_descriptor *); |
|
|
|
|
|
extern struct usb_ep *usb_ep_autoconfig_ss(struct usb_gadget *, |
|
struct usb_endpoint_descriptor *, |
|
struct usb_ss_ep_comp_descriptor *); |
|
|
|
extern void usb_ep_autoconfig_release(struct usb_ep *); |
|
|
|
extern void usb_ep_autoconfig_reset(struct usb_gadget *); |
|
|
|
#endif /* __LINUX_USB_GADGET_H */
|
|
|