1583 lines
43 KiB
C
1583 lines
43 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/**
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* udc.c - Core UDC Framework
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*
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* Copyright (C) 2010 Texas Instruments
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* Author: Felipe Balbi <balbi@ti.com>
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/device.h>
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#include <linux/list.h>
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#include <linux/err.h>
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#include <linux/dma-mapping.h>
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#include <linux/sched/task_stack.h>
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#include <linux/workqueue.h>
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#include <linux/usb/ch9.h>
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#include <linux/usb/gadget.h>
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#include <linux/usb.h>
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#include "trace.h"
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/**
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* struct usb_udc - describes one usb device controller
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* @driver - the gadget driver pointer. For use by the class code
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* @dev - the child device to the actual controller
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* @gadget - the gadget. For use by the class code
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* @list - for use by the udc class driver
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* @vbus - for udcs who care about vbus status, this value is real vbus status;
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* for udcs who do not care about vbus status, this value is always true
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*
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* This represents the internal data structure which is used by the UDC-class
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* to hold information about udc driver and gadget together.
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*/
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struct usb_udc {
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struct usb_gadget_driver *driver;
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struct usb_gadget *gadget;
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struct device dev;
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struct list_head list;
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bool vbus;
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};
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static struct class *udc_class;
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static LIST_HEAD(udc_list);
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static LIST_HEAD(gadget_driver_pending_list);
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static DEFINE_MUTEX(udc_lock);
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static int udc_bind_to_driver(struct usb_udc *udc,
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struct usb_gadget_driver *driver);
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/* ------------------------------------------------------------------------- */
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/**
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* usb_ep_set_maxpacket_limit - set maximum packet size limit for endpoint
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* @ep:the endpoint being configured
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* @maxpacket_limit:value of maximum packet size limit
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*
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* This function should be used only in UDC drivers to initialize endpoint
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* (usually in probe function).
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*/
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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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ep->maxpacket_limit = maxpacket_limit;
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ep->maxpacket = maxpacket_limit;
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trace_usb_ep_set_maxpacket_limit(ep, 0);
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}
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EXPORT_SYMBOL_GPL(usb_ep_set_maxpacket_limit);
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/**
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* usb_ep_enable - configure endpoint, making it usable
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* @ep:the endpoint being configured. may not be the endpoint named "ep0".
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* drivers discover endpoints through the ep_list of a usb_gadget.
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*
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* When configurations are set, or when interface settings change, the driver
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* will enable or disable the relevant endpoints. while it is enabled, an
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* endpoint may be used for i/o until the driver receives a disconnect() from
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* the host or until the endpoint is disabled.
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*
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* the ep0 implementation (which calls this routine) must ensure that the
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* hardware capabilities of each endpoint match the descriptor provided
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* for it. for example, an endpoint named "ep2in-bulk" would be usable
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* for interrupt transfers as well as bulk, but it likely couldn't be used
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* for iso transfers or for endpoint 14. some endpoints are fully
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* configurable, with more generic names like "ep-a". (remember that for
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* USB, "in" means "towards the USB master".)
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*
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* returns zero, or a negative error code.
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*/
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int usb_ep_enable(struct usb_ep *ep)
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{
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int ret = 0;
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if (ep->enabled)
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goto out;
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ret = ep->ops->enable(ep, ep->desc);
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if (ret)
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goto out;
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ep->enabled = true;
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out:
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trace_usb_ep_enable(ep, ret);
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return ret;
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}
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EXPORT_SYMBOL_GPL(usb_ep_enable);
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/**
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* usb_ep_disable - endpoint is no longer usable
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* @ep:the endpoint being unconfigured. may not be the endpoint named "ep0".
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*
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* no other task may be using this endpoint when this is called.
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* any pending and uncompleted requests will complete with status
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* indicating disconnect (-ESHUTDOWN) before this call returns.
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* gadget drivers must call usb_ep_enable() again before queueing
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* requests to the endpoint.
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*
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* returns zero, or a negative error code.
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*/
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int usb_ep_disable(struct usb_ep *ep)
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{
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int ret = 0;
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if (!ep->enabled)
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goto out;
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ret = ep->ops->disable(ep);
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if (ret)
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goto out;
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ep->enabled = false;
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out:
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trace_usb_ep_disable(ep, ret);
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return ret;
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}
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EXPORT_SYMBOL_GPL(usb_ep_disable);
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/**
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* usb_ep_alloc_request - allocate a request object to use with this endpoint
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* @ep:the endpoint to be used with with the request
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* @gfp_flags:GFP_* flags to use
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*
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* Request objects must be allocated with this call, since they normally
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* need controller-specific setup and may even need endpoint-specific
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* resources such as allocation of DMA descriptors.
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* Requests may be submitted with usb_ep_queue(), and receive a single
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* completion callback. Free requests with usb_ep_free_request(), when
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* they are no longer needed.
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*
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* Returns the request, or null if one could not be allocated.
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*/
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struct usb_request *usb_ep_alloc_request(struct usb_ep *ep,
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gfp_t gfp_flags)
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{
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struct usb_request *req = NULL;
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req = ep->ops->alloc_request(ep, gfp_flags);
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trace_usb_ep_alloc_request(ep, req, req ? 0 : -ENOMEM);
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return req;
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}
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EXPORT_SYMBOL_GPL(usb_ep_alloc_request);
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/**
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* usb_ep_free_request - frees a request object
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* @ep:the endpoint associated with the request
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* @req:the request being freed
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*
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* Reverses the effect of usb_ep_alloc_request().
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* Caller guarantees the request is not queued, and that it will
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* no longer be requeued (or otherwise used).
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*/
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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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ep->ops->free_request(ep, req);
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trace_usb_ep_free_request(ep, req, 0);
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}
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EXPORT_SYMBOL_GPL(usb_ep_free_request);
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/**
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* usb_ep_queue - queues (submits) an I/O request to an endpoint.
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* @ep:the endpoint associated with the request
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* @req:the request being submitted
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* @gfp_flags: GFP_* flags to use in case the lower level driver couldn't
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* pre-allocate all necessary memory with the request.
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*
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* This tells the device controller to perform the specified request through
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* that endpoint (reading or writing a buffer). When the request completes,
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* including being canceled by usb_ep_dequeue(), the request's completion
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* routine is called to return the request to the driver. Any endpoint
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* (except control endpoints like ep0) may have more than one transfer
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* request queued; they complete in FIFO order. Once a gadget driver
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* submits a request, that request may not be examined or modified until it
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* is given back to that driver through the completion callback.
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*
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* Each request is turned into one or more packets. The controller driver
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* never merges adjacent requests into the same packet. OUT transfers
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* will sometimes use data that's already buffered in the hardware.
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* Drivers can rely on the fact that the first byte of the request's buffer
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* always corresponds to the first byte of some USB packet, for both
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* IN and OUT transfers.
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*
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* Bulk endpoints can queue any amount of data; the transfer is packetized
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* automatically. The last packet will be short if the request doesn't fill it
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* out completely. Zero length packets (ZLPs) should be avoided in portable
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* protocols since not all usb hardware can successfully handle zero length
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* packets. (ZLPs may be explicitly written, and may be implicitly written if
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* the request 'zero' flag is set.) Bulk endpoints may also be used
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* for interrupt transfers; but the reverse is not true, and some endpoints
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* won't support every interrupt transfer. (Such as 768 byte packets.)
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*
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* Interrupt-only endpoints are less functional than bulk endpoints, for
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* example by not supporting queueing or not handling buffers that are
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* larger than the endpoint's maxpacket size. They may also treat data
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* toggle differently.
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*
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* Control endpoints ... after getting a setup() callback, the driver queues
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* one response (even if it would be zero length). That enables the
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* status ack, after transferring data as specified in the response. Setup
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* functions may return negative error codes to generate protocol stalls.
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* (Note that some USB device controllers disallow protocol stall responses
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* in some cases.) When control responses are deferred (the response is
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* written after the setup callback returns), then usb_ep_set_halt() may be
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* used on ep0 to trigger protocol stalls. Depending on the controller,
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* it may not be possible to trigger a status-stage protocol stall when the
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* data stage is over, that is, from within the response's completion
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* routine.
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*
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* For periodic endpoints, like interrupt or isochronous ones, the usb host
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* arranges to poll once per interval, and the gadget driver usually will
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* have queued some data to transfer at that time.
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*
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* Returns zero, or a negative error code. Endpoints that are not enabled
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* report errors; errors will also be
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* reported when the usb peripheral is disconnected.
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*/
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int usb_ep_queue(struct usb_ep *ep,
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struct usb_request *req, gfp_t gfp_flags)
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{
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int ret = 0;
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if (WARN_ON_ONCE(!ep->enabled && ep->address)) {
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ret = -ESHUTDOWN;
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goto out;
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}
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ret = ep->ops->queue(ep, req, gfp_flags);
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out:
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trace_usb_ep_queue(ep, req, ret);
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return ret;
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}
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EXPORT_SYMBOL_GPL(usb_ep_queue);
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/**
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* usb_ep_dequeue - dequeues (cancels, unlinks) an I/O request from an endpoint
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* @ep:the endpoint associated with the request
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* @req:the request being canceled
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*
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* If the request is still active on the endpoint, it is dequeued and its
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* completion routine is called (with status -ECONNRESET); else a negative
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* error code is returned. This is guaranteed to happen before the call to
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* usb_ep_dequeue() returns.
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*
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* Note that some hardware can't clear out write fifos (to unlink the request
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* at the head of the queue) except as part of disconnecting from usb. Such
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* restrictions prevent drivers from supporting configuration changes,
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* even to configuration zero (a "chapter 9" requirement).
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*/
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int usb_ep_dequeue(struct usb_ep *ep, struct usb_request *req)
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{
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int ret;
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ret = ep->ops->dequeue(ep, req);
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trace_usb_ep_dequeue(ep, req, ret);
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return ret;
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}
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EXPORT_SYMBOL_GPL(usb_ep_dequeue);
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/**
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* usb_ep_set_halt - sets the endpoint halt feature.
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* @ep: the non-isochronous endpoint being stalled
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*
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* Use this to stall an endpoint, perhaps as an error report.
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* Except for control endpoints,
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* the endpoint stays halted (will not stream any data) until the host
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* clears this feature; drivers may need to empty the endpoint's request
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* queue first, to make sure no inappropriate transfers happen.
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*
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* Note that while an endpoint CLEAR_FEATURE will be invisible to the
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* gadget driver, a SET_INTERFACE will not be. To reset endpoints for the
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* current altsetting, see usb_ep_clear_halt(). When switching altsettings,
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* it's simplest to use usb_ep_enable() or usb_ep_disable() for the endpoints.
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*
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* Returns zero, or a negative error code. On success, this call sets
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* underlying hardware state that blocks data transfers.
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* Attempts to halt IN endpoints will fail (returning -EAGAIN) if any
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* transfer requests are still queued, or if the controller hardware
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* (usually a FIFO) still holds bytes that the host hasn't collected.
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*/
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int usb_ep_set_halt(struct usb_ep *ep)
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{
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int ret;
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ret = ep->ops->set_halt(ep, 1);
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trace_usb_ep_set_halt(ep, ret);
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return ret;
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}
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EXPORT_SYMBOL_GPL(usb_ep_set_halt);
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/**
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* usb_ep_clear_halt - clears endpoint halt, and resets toggle
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* @ep:the bulk or interrupt endpoint being reset
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*
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* Use this when responding to the standard usb "set interface" request,
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* for endpoints that aren't reconfigured, after clearing any other state
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* in the endpoint's i/o queue.
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*
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* Returns zero, or a negative error code. On success, this call clears
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* the underlying hardware state reflecting endpoint halt and data toggle.
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* Note that some hardware can't support this request (like pxa2xx_udc),
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* and accordingly can't correctly implement interface altsettings.
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*/
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int usb_ep_clear_halt(struct usb_ep *ep)
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{
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int ret;
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ret = ep->ops->set_halt(ep, 0);
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trace_usb_ep_clear_halt(ep, ret);
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return ret;
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}
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EXPORT_SYMBOL_GPL(usb_ep_clear_halt);
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/**
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* usb_ep_set_wedge - sets the halt feature and ignores clear requests
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* @ep: the endpoint being wedged
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*
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* Use this to stall an endpoint and ignore CLEAR_FEATURE(HALT_ENDPOINT)
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* requests. If the gadget driver clears the halt status, it will
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* automatically unwedge the endpoint.
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*
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* Returns zero on success, else negative errno.
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*/
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int usb_ep_set_wedge(struct usb_ep *ep)
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{
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int ret;
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if (ep->ops->set_wedge)
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ret = ep->ops->set_wedge(ep);
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else
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ret = ep->ops->set_halt(ep, 1);
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trace_usb_ep_set_wedge(ep, ret);
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return ret;
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}
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EXPORT_SYMBOL_GPL(usb_ep_set_wedge);
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/**
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* usb_ep_fifo_status - returns number of bytes in fifo, or error
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* @ep: the endpoint whose fifo status is being checked.
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*
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* FIFO endpoints may have "unclaimed data" in them in certain cases,
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* such as after aborted transfers. Hosts may not have collected all
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* the IN data written by the gadget driver (and reported by a request
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* completion). The gadget driver may not have collected all the data
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* written OUT to it by the host. Drivers that need precise handling for
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* fault reporting or recovery may need to use this call.
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*
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* This returns the number of such bytes in the fifo, or a negative
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* errno if the endpoint doesn't use a FIFO or doesn't support such
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* precise handling.
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*/
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int usb_ep_fifo_status(struct usb_ep *ep)
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{
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int ret;
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if (ep->ops->fifo_status)
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ret = ep->ops->fifo_status(ep);
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else
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ret = -EOPNOTSUPP;
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trace_usb_ep_fifo_status(ep, ret);
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return ret;
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}
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EXPORT_SYMBOL_GPL(usb_ep_fifo_status);
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/**
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* usb_ep_fifo_flush - flushes contents of a fifo
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* @ep: the endpoint whose fifo is being flushed.
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*
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* This call may be used to flush the "unclaimed data" that may exist in
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* an endpoint fifo after abnormal transaction terminations. The call
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* must never be used except when endpoint is not being used for any
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* protocol translation.
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*/
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void usb_ep_fifo_flush(struct usb_ep *ep)
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{
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if (ep->ops->fifo_flush)
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ep->ops->fifo_flush(ep);
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trace_usb_ep_fifo_flush(ep, 0);
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}
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EXPORT_SYMBOL_GPL(usb_ep_fifo_flush);
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/* ------------------------------------------------------------------------- */
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/**
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* usb_gadget_frame_number - returns the current frame number
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* @gadget: controller that reports the frame number
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*
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* Returns the usb frame number, normally eleven bits from a SOF packet,
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* or negative errno if this device doesn't support this capability.
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*/
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int usb_gadget_frame_number(struct usb_gadget *gadget)
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{
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int ret;
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ret = gadget->ops->get_frame(gadget);
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trace_usb_gadget_frame_number(gadget, ret);
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return ret;
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}
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EXPORT_SYMBOL_GPL(usb_gadget_frame_number);
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|
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/**
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* usb_gadget_wakeup - tries to wake up the host connected to this gadget
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* @gadget: controller used to wake up the host
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*
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* Returns zero on success, else negative error code if the hardware
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* doesn't support such attempts, or its support has not been enabled
|
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* by the usb host. Drivers must return device descriptors that report
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* their ability to support this, or hosts won't enable it.
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*
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* This may also try to use SRP to wake the host and start enumeration,
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* even if OTG isn't otherwise in use. OTG devices may also start
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* remote wakeup even when hosts don't explicitly enable it.
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*/
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int usb_gadget_wakeup(struct usb_gadget *gadget)
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{
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int ret = 0;
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if (!gadget->ops->wakeup) {
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ret = -EOPNOTSUPP;
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goto out;
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}
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ret = gadget->ops->wakeup(gadget);
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out:
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trace_usb_gadget_wakeup(gadget, ret);
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return ret;
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}
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EXPORT_SYMBOL_GPL(usb_gadget_wakeup);
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|
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/**
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* usb_gadget_set_selfpowered - sets the device selfpowered feature.
|
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* @gadget:the device being declared as self-powered
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*
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* this affects the device status reported by the hardware driver
|
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* to reflect that it now has a local power supply.
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*
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* returns zero on success, else negative errno.
|
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*/
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int usb_gadget_set_selfpowered(struct usb_gadget *gadget)
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{
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int ret = 0;
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|
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if (!gadget->ops->set_selfpowered) {
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ret = -EOPNOTSUPP;
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goto out;
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}
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|
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ret = gadget->ops->set_selfpowered(gadget, 1);
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out:
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trace_usb_gadget_set_selfpowered(gadget, ret);
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return ret;
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}
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EXPORT_SYMBOL_GPL(usb_gadget_set_selfpowered);
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|
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/**
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* usb_gadget_clear_selfpowered - clear the device selfpowered feature.
|
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* @gadget:the device being declared as bus-powered
|
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*
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* this affects the device status reported by the hardware driver.
|
|
* some hardware may not support bus-powered operation, in which
|
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* case this feature's value can never change.
|
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*
|
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* returns zero on success, else negative errno.
|
|
*/
|
|
int usb_gadget_clear_selfpowered(struct usb_gadget *gadget)
|
|
{
|
|
int ret = 0;
|
|
|
|
if (!gadget->ops->set_selfpowered) {
|
|
ret = -EOPNOTSUPP;
|
|
goto out;
|
|
}
|
|
|
|
ret = gadget->ops->set_selfpowered(gadget, 0);
|
|
|
|
out:
|
|
trace_usb_gadget_clear_selfpowered(gadget, ret);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(usb_gadget_clear_selfpowered);
|
|
|
|
/**
|
|
* usb_gadget_vbus_connect - Notify controller that VBUS is powered
|
|
* @gadget:The device which now has VBUS power.
|
|
* Context: can sleep
|
|
*
|
|
* This call is used by a driver for an external transceiver (or GPIO)
|
|
* that detects a VBUS power session starting. Common responses include
|
|
* resuming the controller, activating the D+ (or D-) pullup to let the
|
|
* host detect that a USB device is attached, and starting to draw power
|
|
* (8mA or possibly more, especially after SET_CONFIGURATION).
|
|
*
|
|
* Returns zero on success, else negative errno.
|
|
*/
|
|
int usb_gadget_vbus_connect(struct usb_gadget *gadget)
|
|
{
|
|
int ret = 0;
|
|
|
|
if (!gadget->ops->vbus_session) {
|
|
ret = -EOPNOTSUPP;
|
|
goto out;
|
|
}
|
|
|
|
ret = gadget->ops->vbus_session(gadget, 1);
|
|
|
|
out:
|
|
trace_usb_gadget_vbus_connect(gadget, ret);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(usb_gadget_vbus_connect);
|
|
|
|
/**
|
|
* usb_gadget_vbus_draw - constrain controller's VBUS power usage
|
|
* @gadget:The device whose VBUS usage is being described
|
|
* @mA:How much current to draw, in milliAmperes. This should be twice
|
|
* the value listed in the configuration descriptor bMaxPower field.
|
|
*
|
|
* This call is used by gadget drivers during SET_CONFIGURATION calls,
|
|
* reporting how much power the device may consume. For example, this
|
|
* could affect how quickly batteries are recharged.
|
|
*
|
|
* Returns zero on success, else negative errno.
|
|
*/
|
|
int usb_gadget_vbus_draw(struct usb_gadget *gadget, unsigned mA)
|
|
{
|
|
int ret = 0;
|
|
|
|
if (!gadget->ops->vbus_draw) {
|
|
ret = -EOPNOTSUPP;
|
|
goto out;
|
|
}
|
|
|
|
ret = gadget->ops->vbus_draw(gadget, mA);
|
|
if (!ret)
|
|
gadget->mA = mA;
|
|
|
|
out:
|
|
trace_usb_gadget_vbus_draw(gadget, ret);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(usb_gadget_vbus_draw);
|
|
|
|
/**
|
|
* usb_gadget_vbus_disconnect - notify controller about VBUS session end
|
|
* @gadget:the device whose VBUS supply is being described
|
|
* Context: can sleep
|
|
*
|
|
* This call is used by a driver for an external transceiver (or GPIO)
|
|
* that detects a VBUS power session ending. Common responses include
|
|
* reversing everything done in usb_gadget_vbus_connect().
|
|
*
|
|
* Returns zero on success, else negative errno.
|
|
*/
|
|
int usb_gadget_vbus_disconnect(struct usb_gadget *gadget)
|
|
{
|
|
int ret = 0;
|
|
|
|
if (!gadget->ops->vbus_session) {
|
|
ret = -EOPNOTSUPP;
|
|
goto out;
|
|
}
|
|
|
|
ret = gadget->ops->vbus_session(gadget, 0);
|
|
|
|
out:
|
|
trace_usb_gadget_vbus_disconnect(gadget, ret);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(usb_gadget_vbus_disconnect);
|
|
|
|
/**
|
|
* usb_gadget_connect - software-controlled connect to USB host
|
|
* @gadget:the peripheral being connected
|
|
*
|
|
* Enables the D+ (or potentially D-) pullup. The host will start
|
|
* enumerating this gadget when the pullup is active and a VBUS session
|
|
* is active (the link is powered). This pullup is always enabled unless
|
|
* usb_gadget_disconnect() has been used to disable it.
|
|
*
|
|
* Returns zero on success, else negative errno.
|
|
*/
|
|
int usb_gadget_connect(struct usb_gadget *gadget)
|
|
{
|
|
int ret = 0;
|
|
|
|
if (!gadget->ops->pullup) {
|
|
ret = -EOPNOTSUPP;
|
|
goto out;
|
|
}
|
|
|
|
if (gadget->deactivated) {
|
|
/*
|
|
* If gadget is deactivated we only save new state.
|
|
* Gadget will be connected automatically after activation.
|
|
*/
|
|
gadget->connected = true;
|
|
goto out;
|
|
}
|
|
|
|
ret = gadget->ops->pullup(gadget, 1);
|
|
if (!ret)
|
|
gadget->connected = 1;
|
|
|
|
out:
|
|
trace_usb_gadget_connect(gadget, ret);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(usb_gadget_connect);
|
|
|
|
/**
|
|
* usb_gadget_disconnect - software-controlled disconnect from USB host
|
|
* @gadget:the peripheral being disconnected
|
|
*
|
|
* Disables the D+ (or potentially D-) pullup, which the host may see
|
|
* as a disconnect (when a VBUS session is active). Not all systems
|
|
* support software pullup controls.
|
|
*
|
|
* Returns zero on success, else negative errno.
|
|
*/
|
|
int usb_gadget_disconnect(struct usb_gadget *gadget)
|
|
{
|
|
int ret = 0;
|
|
|
|
if (!gadget->ops->pullup) {
|
|
ret = -EOPNOTSUPP;
|
|
goto out;
|
|
}
|
|
|
|
if (gadget->deactivated) {
|
|
/*
|
|
* If gadget is deactivated we only save new state.
|
|
* Gadget will stay disconnected after activation.
|
|
*/
|
|
gadget->connected = false;
|
|
goto out;
|
|
}
|
|
|
|
ret = gadget->ops->pullup(gadget, 0);
|
|
if (!ret)
|
|
gadget->connected = 0;
|
|
|
|
out:
|
|
trace_usb_gadget_disconnect(gadget, ret);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(usb_gadget_disconnect);
|
|
|
|
/**
|
|
* usb_gadget_deactivate - deactivate function which is not ready to work
|
|
* @gadget: the peripheral being deactivated
|
|
*
|
|
* This routine may be used during the gadget driver bind() call to prevent
|
|
* the peripheral from ever being visible to the USB host, unless later
|
|
* usb_gadget_activate() is called. For example, user mode components may
|
|
* need to be activated before the system can talk to hosts.
|
|
*
|
|
* Returns zero on success, else negative errno.
|
|
*/
|
|
int usb_gadget_deactivate(struct usb_gadget *gadget)
|
|
{
|
|
int ret = 0;
|
|
|
|
if (gadget->deactivated)
|
|
goto out;
|
|
|
|
if (gadget->connected) {
|
|
ret = usb_gadget_disconnect(gadget);
|
|
if (ret)
|
|
goto out;
|
|
|
|
/*
|
|
* If gadget was being connected before deactivation, we want
|
|
* to reconnect it in usb_gadget_activate().
|
|
*/
|
|
gadget->connected = true;
|
|
}
|
|
gadget->deactivated = true;
|
|
|
|
out:
|
|
trace_usb_gadget_deactivate(gadget, ret);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(usb_gadget_deactivate);
|
|
|
|
/**
|
|
* usb_gadget_activate - activate function which is not ready to work
|
|
* @gadget: the peripheral being activated
|
|
*
|
|
* This routine activates gadget which was previously deactivated with
|
|
* usb_gadget_deactivate() call. It calls usb_gadget_connect() if needed.
|
|
*
|
|
* Returns zero on success, else negative errno.
|
|
*/
|
|
int usb_gadget_activate(struct usb_gadget *gadget)
|
|
{
|
|
int ret = 0;
|
|
|
|
if (!gadget->deactivated)
|
|
goto out;
|
|
|
|
gadget->deactivated = false;
|
|
|
|
/*
|
|
* If gadget has been connected before deactivation, or became connected
|
|
* while it was being deactivated, we call usb_gadget_connect().
|
|
*/
|
|
if (gadget->connected)
|
|
ret = usb_gadget_connect(gadget);
|
|
|
|
out:
|
|
trace_usb_gadget_activate(gadget, ret);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(usb_gadget_activate);
|
|
|
|
/* ------------------------------------------------------------------------- */
|
|
|
|
#ifdef CONFIG_HAS_DMA
|
|
|
|
int usb_gadget_map_request_by_dev(struct device *dev,
|
|
struct usb_request *req, int is_in)
|
|
{
|
|
if (req->length == 0)
|
|
return 0;
|
|
|
|
if (req->num_sgs) {
|
|
int mapped;
|
|
|
|
mapped = dma_map_sg(dev, req->sg, req->num_sgs,
|
|
is_in ? DMA_TO_DEVICE : DMA_FROM_DEVICE);
|
|
if (mapped == 0) {
|
|
dev_err(dev, "failed to map SGs\n");
|
|
return -EFAULT;
|
|
}
|
|
|
|
req->num_mapped_sgs = mapped;
|
|
} else {
|
|
if (is_vmalloc_addr(req->buf)) {
|
|
dev_err(dev, "buffer is not dma capable\n");
|
|
return -EFAULT;
|
|
} else if (object_is_on_stack(req->buf)) {
|
|
dev_err(dev, "buffer is on stack\n");
|
|
return -EFAULT;
|
|
}
|
|
|
|
req->dma = dma_map_single(dev, req->buf, req->length,
|
|
is_in ? DMA_TO_DEVICE : DMA_FROM_DEVICE);
|
|
|
|
if (dma_mapping_error(dev, req->dma)) {
|
|
dev_err(dev, "failed to map buffer\n");
|
|
return -EFAULT;
|
|
}
|
|
|
|
req->dma_mapped = 1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(usb_gadget_map_request_by_dev);
|
|
|
|
int usb_gadget_map_request(struct usb_gadget *gadget,
|
|
struct usb_request *req, int is_in)
|
|
{
|
|
return usb_gadget_map_request_by_dev(gadget->dev.parent, req, is_in);
|
|
}
|
|
EXPORT_SYMBOL_GPL(usb_gadget_map_request);
|
|
|
|
void usb_gadget_unmap_request_by_dev(struct device *dev,
|
|
struct usb_request *req, int is_in)
|
|
{
|
|
if (req->length == 0)
|
|
return;
|
|
|
|
if (req->num_mapped_sgs) {
|
|
dma_unmap_sg(dev, req->sg, req->num_sgs,
|
|
is_in ? DMA_TO_DEVICE : DMA_FROM_DEVICE);
|
|
|
|
req->num_mapped_sgs = 0;
|
|
} else if (req->dma_mapped) {
|
|
dma_unmap_single(dev, req->dma, req->length,
|
|
is_in ? DMA_TO_DEVICE : DMA_FROM_DEVICE);
|
|
req->dma_mapped = 0;
|
|
}
|
|
}
|
|
EXPORT_SYMBOL_GPL(usb_gadget_unmap_request_by_dev);
|
|
|
|
void usb_gadget_unmap_request(struct usb_gadget *gadget,
|
|
struct usb_request *req, int is_in)
|
|
{
|
|
usb_gadget_unmap_request_by_dev(gadget->dev.parent, req, is_in);
|
|
}
|
|
EXPORT_SYMBOL_GPL(usb_gadget_unmap_request);
|
|
|
|
#endif /* CONFIG_HAS_DMA */
|
|
|
|
/* ------------------------------------------------------------------------- */
|
|
|
|
/**
|
|
* usb_gadget_giveback_request - give the request back to the gadget layer
|
|
* Context: in_interrupt()
|
|
*
|
|
* This is called by device controller drivers in order to return the
|
|
* completed request back to the gadget layer.
|
|
*/
|
|
void usb_gadget_giveback_request(struct usb_ep *ep,
|
|
struct usb_request *req)
|
|
{
|
|
if (likely(req->status == 0))
|
|
usb_led_activity(USB_LED_EVENT_GADGET);
|
|
|
|
trace_usb_gadget_giveback_request(ep, req, 0);
|
|
|
|
req->complete(ep, req);
|
|
}
|
|
EXPORT_SYMBOL_GPL(usb_gadget_giveback_request);
|
|
|
|
/* ------------------------------------------------------------------------- */
|
|
|
|
/**
|
|
* gadget_find_ep_by_name - returns ep whose name is the same as sting passed
|
|
* in second parameter or NULL if searched endpoint not found
|
|
* @g: controller to check for quirk
|
|
* @name: name of searched endpoint
|
|
*/
|
|
struct usb_ep *gadget_find_ep_by_name(struct usb_gadget *g, const char *name)
|
|
{
|
|
struct usb_ep *ep;
|
|
|
|
gadget_for_each_ep(ep, g) {
|
|
if (!strcmp(ep->name, name))
|
|
return ep;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
EXPORT_SYMBOL_GPL(gadget_find_ep_by_name);
|
|
|
|
/* ------------------------------------------------------------------------- */
|
|
|
|
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)
|
|
{
|
|
u8 type;
|
|
u16 max;
|
|
int num_req_streams = 0;
|
|
|
|
/* endpoint already claimed? */
|
|
if (ep->claimed)
|
|
return 0;
|
|
|
|
type = usb_endpoint_type(desc);
|
|
max = usb_endpoint_maxp(desc);
|
|
|
|
if (usb_endpoint_dir_in(desc) && !ep->caps.dir_in)
|
|
return 0;
|
|
if (usb_endpoint_dir_out(desc) && !ep->caps.dir_out)
|
|
return 0;
|
|
|
|
if (max > ep->maxpacket_limit)
|
|
return 0;
|
|
|
|
/* "high bandwidth" works only at high speed */
|
|
if (!gadget_is_dualspeed(gadget) && usb_endpoint_maxp(desc) & (3<<11))
|
|
return 0;
|
|
|
|
switch (type) {
|
|
case USB_ENDPOINT_XFER_CONTROL:
|
|
/* only support ep0 for portable CONTROL traffic */
|
|
return 0;
|
|
case USB_ENDPOINT_XFER_ISOC:
|
|
if (!ep->caps.type_iso)
|
|
return 0;
|
|
/* ISO: limit 1023 bytes full speed, 1024 high/super speed */
|
|
if (!gadget_is_dualspeed(gadget) && max > 1023)
|
|
return 0;
|
|
break;
|
|
case USB_ENDPOINT_XFER_BULK:
|
|
if (!ep->caps.type_bulk)
|
|
return 0;
|
|
if (ep_comp && gadget_is_superspeed(gadget)) {
|
|
/* Get the number of required streams from the
|
|
* EP companion descriptor and see if the EP
|
|
* matches it
|
|
*/
|
|
num_req_streams = ep_comp->bmAttributes & 0x1f;
|
|
if (num_req_streams > ep->max_streams)
|
|
return 0;
|
|
}
|
|
break;
|
|
case USB_ENDPOINT_XFER_INT:
|
|
/* Bulk endpoints handle interrupt transfers,
|
|
* except the toggle-quirky iso-synch kind
|
|
*/
|
|
if (!ep->caps.type_int && !ep->caps.type_bulk)
|
|
return 0;
|
|
/* INT: limit 64 bytes full speed, 1024 high/super speed */
|
|
if (!gadget_is_dualspeed(gadget) && max > 64)
|
|
return 0;
|
|
break;
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
EXPORT_SYMBOL_GPL(usb_gadget_ep_match_desc);
|
|
|
|
/* ------------------------------------------------------------------------- */
|
|
|
|
static void usb_gadget_state_work(struct work_struct *work)
|
|
{
|
|
struct usb_gadget *gadget = work_to_gadget(work);
|
|
struct usb_udc *udc = gadget->udc;
|
|
|
|
if (udc)
|
|
sysfs_notify(&udc->dev.kobj, NULL, "state");
|
|
}
|
|
|
|
void usb_gadget_set_state(struct usb_gadget *gadget,
|
|
enum usb_device_state state)
|
|
{
|
|
gadget->state = state;
|
|
schedule_work(&gadget->work);
|
|
}
|
|
EXPORT_SYMBOL_GPL(usb_gadget_set_state);
|
|
|
|
/* ------------------------------------------------------------------------- */
|
|
|
|
static void usb_udc_connect_control(struct usb_udc *udc)
|
|
{
|
|
if (udc->vbus)
|
|
usb_gadget_connect(udc->gadget);
|
|
else
|
|
usb_gadget_disconnect(udc->gadget);
|
|
}
|
|
|
|
/**
|
|
* usb_udc_vbus_handler - updates the udc core vbus status, and try to
|
|
* connect or disconnect gadget
|
|
* @gadget: The gadget which vbus change occurs
|
|
* @status: The vbus status
|
|
*
|
|
* The udc driver calls it when it wants to connect or disconnect gadget
|
|
* according to vbus status.
|
|
*/
|
|
void usb_udc_vbus_handler(struct usb_gadget *gadget, bool status)
|
|
{
|
|
struct usb_udc *udc = gadget->udc;
|
|
|
|
if (udc) {
|
|
udc->vbus = status;
|
|
usb_udc_connect_control(udc);
|
|
}
|
|
}
|
|
EXPORT_SYMBOL_GPL(usb_udc_vbus_handler);
|
|
|
|
/**
|
|
* usb_gadget_udc_reset - notifies the udc core that bus reset occurs
|
|
* @gadget: The gadget which bus reset occurs
|
|
* @driver: The gadget driver we want to notify
|
|
*
|
|
* If the udc driver has bus reset handler, it needs to call this when the bus
|
|
* reset occurs, it notifies the gadget driver that the bus reset occurs as
|
|
* well as updates gadget state.
|
|
*/
|
|
void usb_gadget_udc_reset(struct usb_gadget *gadget,
|
|
struct usb_gadget_driver *driver)
|
|
{
|
|
driver->reset(gadget);
|
|
usb_gadget_set_state(gadget, USB_STATE_DEFAULT);
|
|
}
|
|
EXPORT_SYMBOL_GPL(usb_gadget_udc_reset);
|
|
|
|
/**
|
|
* usb_gadget_udc_start - tells usb device controller to start up
|
|
* @udc: The UDC to be started
|
|
*
|
|
* This call is issued by the UDC Class driver when it's about
|
|
* to register a gadget driver to the device controller, before
|
|
* calling gadget driver's bind() method.
|
|
*
|
|
* It allows the controller to be powered off until strictly
|
|
* necessary to have it powered on.
|
|
*
|
|
* Returns zero on success, else negative errno.
|
|
*/
|
|
static inline int usb_gadget_udc_start(struct usb_udc *udc)
|
|
{
|
|
return udc->gadget->ops->udc_start(udc->gadget, udc->driver);
|
|
}
|
|
|
|
/**
|
|
* usb_gadget_udc_stop - tells usb device controller we don't need it anymore
|
|
* @gadget: The device we want to stop activity
|
|
* @driver: The driver to unbind from @gadget
|
|
*
|
|
* This call is issued by the UDC Class driver after calling
|
|
* gadget driver's unbind() method.
|
|
*
|
|
* The details are implementation specific, but it can go as
|
|
* far as powering off UDC completely and disable its data
|
|
* line pullups.
|
|
*/
|
|
static inline void usb_gadget_udc_stop(struct usb_udc *udc)
|
|
{
|
|
udc->gadget->ops->udc_stop(udc->gadget);
|
|
}
|
|
|
|
/**
|
|
* usb_gadget_udc_set_speed - tells usb device controller speed supported by
|
|
* current driver
|
|
* @udc: The device we want to set maximum speed
|
|
* @speed: The maximum speed to allowed to run
|
|
*
|
|
* This call is issued by the UDC Class driver before calling
|
|
* usb_gadget_udc_start() in order to make sure that we don't try to
|
|
* connect on speeds the gadget driver doesn't support.
|
|
*/
|
|
static inline void usb_gadget_udc_set_speed(struct usb_udc *udc,
|
|
enum usb_device_speed speed)
|
|
{
|
|
if (udc->gadget->ops->udc_set_speed) {
|
|
enum usb_device_speed s;
|
|
|
|
s = min(speed, udc->gadget->max_speed);
|
|
udc->gadget->ops->udc_set_speed(udc->gadget, s);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* usb_udc_release - release the usb_udc struct
|
|
* @dev: the dev member within usb_udc
|
|
*
|
|
* This is called by driver's core in order to free memory once the last
|
|
* reference is released.
|
|
*/
|
|
static void usb_udc_release(struct device *dev)
|
|
{
|
|
struct usb_udc *udc;
|
|
|
|
udc = container_of(dev, struct usb_udc, dev);
|
|
dev_dbg(dev, "releasing '%s'\n", dev_name(dev));
|
|
kfree(udc);
|
|
}
|
|
|
|
static const struct attribute_group *usb_udc_attr_groups[];
|
|
|
|
static void usb_udc_nop_release(struct device *dev)
|
|
{
|
|
dev_vdbg(dev, "%s\n", __func__);
|
|
}
|
|
|
|
/* should be called with udc_lock held */
|
|
static int check_pending_gadget_drivers(struct usb_udc *udc)
|
|
{
|
|
struct usb_gadget_driver *driver;
|
|
int ret = 0;
|
|
|
|
list_for_each_entry(driver, &gadget_driver_pending_list, pending)
|
|
if (!driver->udc_name || strcmp(driver->udc_name,
|
|
dev_name(&udc->dev)) == 0) {
|
|
ret = udc_bind_to_driver(udc, driver);
|
|
if (ret != -EPROBE_DEFER)
|
|
list_del(&driver->pending);
|
|
break;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* usb_add_gadget_udc_release - adds a new gadget to the udc class driver list
|
|
* @parent: the parent device to this udc. Usually the controller driver's
|
|
* device.
|
|
* @gadget: the gadget to be added to the list.
|
|
* @release: a gadget release function.
|
|
*
|
|
* Returns zero on success, negative errno otherwise.
|
|
* Calls the gadget release function in the latter case.
|
|
*/
|
|
int usb_add_gadget_udc_release(struct device *parent, struct usb_gadget *gadget,
|
|
void (*release)(struct device *dev))
|
|
{
|
|
struct usb_udc *udc;
|
|
int ret = -ENOMEM;
|
|
|
|
dev_set_name(&gadget->dev, "gadget");
|
|
INIT_WORK(&gadget->work, usb_gadget_state_work);
|
|
gadget->dev.parent = parent;
|
|
|
|
if (release)
|
|
gadget->dev.release = release;
|
|
else
|
|
gadget->dev.release = usb_udc_nop_release;
|
|
|
|
device_initialize(&gadget->dev);
|
|
|
|
udc = kzalloc(sizeof(*udc), GFP_KERNEL);
|
|
if (!udc)
|
|
goto err_put_gadget;
|
|
|
|
device_initialize(&udc->dev);
|
|
udc->dev.release = usb_udc_release;
|
|
udc->dev.class = udc_class;
|
|
udc->dev.groups = usb_udc_attr_groups;
|
|
udc->dev.parent = parent;
|
|
ret = dev_set_name(&udc->dev, "%s", kobject_name(&parent->kobj));
|
|
if (ret)
|
|
goto err_put_udc;
|
|
|
|
ret = device_add(&gadget->dev);
|
|
if (ret)
|
|
goto err_put_udc;
|
|
|
|
udc->gadget = gadget;
|
|
gadget->udc = udc;
|
|
|
|
mutex_lock(&udc_lock);
|
|
list_add_tail(&udc->list, &udc_list);
|
|
|
|
ret = device_add(&udc->dev);
|
|
if (ret)
|
|
goto err_unlist_udc;
|
|
|
|
usb_gadget_set_state(gadget, USB_STATE_NOTATTACHED);
|
|
udc->vbus = true;
|
|
|
|
/* pick up one of pending gadget drivers */
|
|
ret = check_pending_gadget_drivers(udc);
|
|
if (ret)
|
|
goto err_del_udc;
|
|
|
|
mutex_unlock(&udc_lock);
|
|
|
|
return 0;
|
|
|
|
err_del_udc:
|
|
device_del(&udc->dev);
|
|
|
|
err_unlist_udc:
|
|
list_del(&udc->list);
|
|
mutex_unlock(&udc_lock);
|
|
|
|
device_del(&gadget->dev);
|
|
|
|
err_put_udc:
|
|
put_device(&udc->dev);
|
|
|
|
err_put_gadget:
|
|
put_device(&gadget->dev);
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(usb_add_gadget_udc_release);
|
|
|
|
/**
|
|
* usb_get_gadget_udc_name - get the name of the first UDC controller
|
|
* This functions returns the name of the first UDC controller in the system.
|
|
* Please note that this interface is usefull only for legacy drivers which
|
|
* assume that there is only one UDC controller in the system and they need to
|
|
* get its name before initialization. There is no guarantee that the UDC
|
|
* of the returned name will be still available, when gadget driver registers
|
|
* itself.
|
|
*
|
|
* Returns pointer to string with UDC controller name on success, NULL
|
|
* otherwise. Caller should kfree() returned string.
|
|
*/
|
|
char *usb_get_gadget_udc_name(void)
|
|
{
|
|
struct usb_udc *udc;
|
|
char *name = NULL;
|
|
|
|
/* For now we take the first available UDC */
|
|
mutex_lock(&udc_lock);
|
|
list_for_each_entry(udc, &udc_list, list) {
|
|
if (!udc->driver) {
|
|
name = kstrdup(udc->gadget->name, GFP_KERNEL);
|
|
break;
|
|
}
|
|
}
|
|
mutex_unlock(&udc_lock);
|
|
return name;
|
|
}
|
|
EXPORT_SYMBOL_GPL(usb_get_gadget_udc_name);
|
|
|
|
/**
|
|
* usb_add_gadget_udc - adds a new gadget to the udc class driver list
|
|
* @parent: the parent device to this udc. Usually the controller
|
|
* driver's device.
|
|
* @gadget: the gadget to be added to the list
|
|
*
|
|
* Returns zero on success, negative errno otherwise.
|
|
*/
|
|
int usb_add_gadget_udc(struct device *parent, struct usb_gadget *gadget)
|
|
{
|
|
return usb_add_gadget_udc_release(parent, gadget, NULL);
|
|
}
|
|
EXPORT_SYMBOL_GPL(usb_add_gadget_udc);
|
|
|
|
static void usb_gadget_remove_driver(struct usb_udc *udc)
|
|
{
|
|
dev_dbg(&udc->dev, "unregistering UDC driver [%s]\n",
|
|
udc->driver->function);
|
|
|
|
kobject_uevent(&udc->dev.kobj, KOBJ_CHANGE);
|
|
|
|
usb_gadget_disconnect(udc->gadget);
|
|
udc->driver->disconnect(udc->gadget);
|
|
udc->driver->unbind(udc->gadget);
|
|
usb_gadget_udc_stop(udc);
|
|
|
|
udc->driver = NULL;
|
|
udc->dev.driver = NULL;
|
|
udc->gadget->dev.driver = NULL;
|
|
}
|
|
|
|
/**
|
|
* usb_del_gadget_udc - deletes @udc from udc_list
|
|
* @gadget: the gadget to be removed.
|
|
*
|
|
* This, will call usb_gadget_unregister_driver() if
|
|
* the @udc is still busy.
|
|
*/
|
|
void usb_del_gadget_udc(struct usb_gadget *gadget)
|
|
{
|
|
struct usb_udc *udc = gadget->udc;
|
|
|
|
if (!udc)
|
|
return;
|
|
|
|
dev_vdbg(gadget->dev.parent, "unregistering gadget\n");
|
|
|
|
mutex_lock(&udc_lock);
|
|
list_del(&udc->list);
|
|
|
|
if (udc->driver) {
|
|
struct usb_gadget_driver *driver = udc->driver;
|
|
|
|
usb_gadget_remove_driver(udc);
|
|
list_add(&driver->pending, &gadget_driver_pending_list);
|
|
}
|
|
mutex_unlock(&udc_lock);
|
|
|
|
kobject_uevent(&udc->dev.kobj, KOBJ_REMOVE);
|
|
flush_work(&gadget->work);
|
|
device_unregister(&udc->dev);
|
|
device_unregister(&gadget->dev);
|
|
memset(&gadget->dev, 0x00, sizeof(gadget->dev));
|
|
}
|
|
EXPORT_SYMBOL_GPL(usb_del_gadget_udc);
|
|
|
|
/* ------------------------------------------------------------------------- */
|
|
|
|
static int udc_bind_to_driver(struct usb_udc *udc, struct usb_gadget_driver *driver)
|
|
{
|
|
int ret;
|
|
|
|
dev_dbg(&udc->dev, "registering UDC driver [%s]\n",
|
|
driver->function);
|
|
|
|
udc->driver = driver;
|
|
udc->dev.driver = &driver->driver;
|
|
udc->gadget->dev.driver = &driver->driver;
|
|
|
|
usb_gadget_udc_set_speed(udc, driver->max_speed);
|
|
|
|
ret = driver->bind(udc->gadget, driver);
|
|
if (ret)
|
|
goto err1;
|
|
ret = usb_gadget_udc_start(udc);
|
|
if (ret) {
|
|
driver->unbind(udc->gadget);
|
|
goto err1;
|
|
}
|
|
usb_udc_connect_control(udc);
|
|
|
|
kobject_uevent(&udc->dev.kobj, KOBJ_CHANGE);
|
|
return 0;
|
|
err1:
|
|
if (ret != -EISNAM)
|
|
dev_err(&udc->dev, "failed to start %s: %d\n",
|
|
udc->driver->function, ret);
|
|
udc->driver = NULL;
|
|
udc->dev.driver = NULL;
|
|
udc->gadget->dev.driver = NULL;
|
|
return ret;
|
|
}
|
|
|
|
int usb_gadget_probe_driver(struct usb_gadget_driver *driver)
|
|
{
|
|
struct usb_udc *udc = NULL;
|
|
int ret = -ENODEV;
|
|
|
|
if (!driver || !driver->bind || !driver->setup)
|
|
return -EINVAL;
|
|
|
|
mutex_lock(&udc_lock);
|
|
if (driver->udc_name) {
|
|
list_for_each_entry(udc, &udc_list, list) {
|
|
ret = strcmp(driver->udc_name, dev_name(&udc->dev));
|
|
if (!ret)
|
|
break;
|
|
}
|
|
if (ret)
|
|
ret = -ENODEV;
|
|
else if (udc->driver)
|
|
ret = -EBUSY;
|
|
else
|
|
goto found;
|
|
} else {
|
|
list_for_each_entry(udc, &udc_list, list) {
|
|
/* For now we take the first one */
|
|
if (!udc->driver)
|
|
goto found;
|
|
}
|
|
}
|
|
|
|
if (!driver->match_existing_only) {
|
|
list_add_tail(&driver->pending, &gadget_driver_pending_list);
|
|
pr_info("udc-core: couldn't find an available UDC - added [%s] to list of pending drivers\n",
|
|
driver->function);
|
|
ret = 0;
|
|
}
|
|
|
|
mutex_unlock(&udc_lock);
|
|
return ret;
|
|
found:
|
|
ret = udc_bind_to_driver(udc, driver);
|
|
mutex_unlock(&udc_lock);
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(usb_gadget_probe_driver);
|
|
|
|
int usb_gadget_unregister_driver(struct usb_gadget_driver *driver)
|
|
{
|
|
struct usb_udc *udc = NULL;
|
|
int ret = -ENODEV;
|
|
|
|
if (!driver || !driver->unbind)
|
|
return -EINVAL;
|
|
|
|
mutex_lock(&udc_lock);
|
|
list_for_each_entry(udc, &udc_list, list) {
|
|
if (udc->driver == driver) {
|
|
usb_gadget_remove_driver(udc);
|
|
usb_gadget_set_state(udc->gadget,
|
|
USB_STATE_NOTATTACHED);
|
|
|
|
/* Maybe there is someone waiting for this UDC? */
|
|
check_pending_gadget_drivers(udc);
|
|
/*
|
|
* For now we ignore bind errors as probably it's
|
|
* not a valid reason to fail other's gadget unbind
|
|
*/
|
|
ret = 0;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (ret) {
|
|
list_del(&driver->pending);
|
|
ret = 0;
|
|
}
|
|
mutex_unlock(&udc_lock);
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(usb_gadget_unregister_driver);
|
|
|
|
/* ------------------------------------------------------------------------- */
|
|
|
|
static ssize_t usb_udc_srp_store(struct device *dev,
|
|
struct device_attribute *attr, const char *buf, size_t n)
|
|
{
|
|
struct usb_udc *udc = container_of(dev, struct usb_udc, dev);
|
|
|
|
if (sysfs_streq(buf, "1"))
|
|
usb_gadget_wakeup(udc->gadget);
|
|
|
|
return n;
|
|
}
|
|
static DEVICE_ATTR(srp, S_IWUSR, NULL, usb_udc_srp_store);
|
|
|
|
static ssize_t usb_udc_softconn_store(struct device *dev,
|
|
struct device_attribute *attr, const char *buf, size_t n)
|
|
{
|
|
struct usb_udc *udc = container_of(dev, struct usb_udc, dev);
|
|
|
|
if (!udc->driver) {
|
|
dev_err(dev, "soft-connect without a gadget driver\n");
|
|
return -EOPNOTSUPP;
|
|
}
|
|
|
|
if (sysfs_streq(buf, "connect")) {
|
|
usb_gadget_udc_start(udc);
|
|
usb_gadget_connect(udc->gadget);
|
|
} else if (sysfs_streq(buf, "disconnect")) {
|
|
usb_gadget_disconnect(udc->gadget);
|
|
udc->driver->disconnect(udc->gadget);
|
|
usb_gadget_udc_stop(udc);
|
|
} else {
|
|
dev_err(dev, "unsupported command '%s'\n", buf);
|
|
return -EINVAL;
|
|
}
|
|
|
|
return n;
|
|
}
|
|
static DEVICE_ATTR(soft_connect, S_IWUSR, NULL, usb_udc_softconn_store);
|
|
|
|
static ssize_t state_show(struct device *dev, struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct usb_udc *udc = container_of(dev, struct usb_udc, dev);
|
|
struct usb_gadget *gadget = udc->gadget;
|
|
|
|
return sprintf(buf, "%s\n", usb_state_string(gadget->state));
|
|
}
|
|
static DEVICE_ATTR_RO(state);
|
|
|
|
static ssize_t function_show(struct device *dev, struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct usb_udc *udc = container_of(dev, struct usb_udc, dev);
|
|
struct usb_gadget_driver *drv = udc->driver;
|
|
|
|
if (!drv || !drv->function)
|
|
return 0;
|
|
return scnprintf(buf, PAGE_SIZE, "%s\n", drv->function);
|
|
}
|
|
static DEVICE_ATTR_RO(function);
|
|
|
|
#define USB_UDC_SPEED_ATTR(name, param) \
|
|
ssize_t name##_show(struct device *dev, \
|
|
struct device_attribute *attr, char *buf) \
|
|
{ \
|
|
struct usb_udc *udc = container_of(dev, struct usb_udc, dev); \
|
|
return snprintf(buf, PAGE_SIZE, "%s\n", \
|
|
usb_speed_string(udc->gadget->param)); \
|
|
} \
|
|
static DEVICE_ATTR_RO(name)
|
|
|
|
static USB_UDC_SPEED_ATTR(current_speed, speed);
|
|
static USB_UDC_SPEED_ATTR(maximum_speed, max_speed);
|
|
|
|
#define USB_UDC_ATTR(name) \
|
|
ssize_t name##_show(struct device *dev, \
|
|
struct device_attribute *attr, char *buf) \
|
|
{ \
|
|
struct usb_udc *udc = container_of(dev, struct usb_udc, dev); \
|
|
struct usb_gadget *gadget = udc->gadget; \
|
|
\
|
|
return snprintf(buf, PAGE_SIZE, "%d\n", gadget->name); \
|
|
} \
|
|
static DEVICE_ATTR_RO(name)
|
|
|
|
static USB_UDC_ATTR(is_otg);
|
|
static USB_UDC_ATTR(is_a_peripheral);
|
|
static USB_UDC_ATTR(b_hnp_enable);
|
|
static USB_UDC_ATTR(a_hnp_support);
|
|
static USB_UDC_ATTR(a_alt_hnp_support);
|
|
static USB_UDC_ATTR(is_selfpowered);
|
|
|
|
static struct attribute *usb_udc_attrs[] = {
|
|
&dev_attr_srp.attr,
|
|
&dev_attr_soft_connect.attr,
|
|
&dev_attr_state.attr,
|
|
&dev_attr_function.attr,
|
|
&dev_attr_current_speed.attr,
|
|
&dev_attr_maximum_speed.attr,
|
|
|
|
&dev_attr_is_otg.attr,
|
|
&dev_attr_is_a_peripheral.attr,
|
|
&dev_attr_b_hnp_enable.attr,
|
|
&dev_attr_a_hnp_support.attr,
|
|
&dev_attr_a_alt_hnp_support.attr,
|
|
&dev_attr_is_selfpowered.attr,
|
|
NULL,
|
|
};
|
|
|
|
static const struct attribute_group usb_udc_attr_group = {
|
|
.attrs = usb_udc_attrs,
|
|
};
|
|
|
|
static const struct attribute_group *usb_udc_attr_groups[] = {
|
|
&usb_udc_attr_group,
|
|
NULL,
|
|
};
|
|
|
|
static int usb_udc_uevent(struct device *dev, struct kobj_uevent_env *env)
|
|
{
|
|
struct usb_udc *udc = container_of(dev, struct usb_udc, dev);
|
|
int ret;
|
|
|
|
ret = add_uevent_var(env, "USB_UDC_NAME=%s", udc->gadget->name);
|
|
if (ret) {
|
|
dev_err(dev, "failed to add uevent USB_UDC_NAME\n");
|
|
return ret;
|
|
}
|
|
|
|
if (udc->driver) {
|
|
ret = add_uevent_var(env, "USB_UDC_DRIVER=%s",
|
|
udc->driver->function);
|
|
if (ret) {
|
|
dev_err(dev, "failed to add uevent USB_UDC_DRIVER\n");
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int __init usb_udc_init(void)
|
|
{
|
|
udc_class = class_create(THIS_MODULE, "udc");
|
|
if (IS_ERR(udc_class)) {
|
|
pr_err("failed to create udc class --> %ld\n",
|
|
PTR_ERR(udc_class));
|
|
return PTR_ERR(udc_class);
|
|
}
|
|
|
|
udc_class->dev_uevent = usb_udc_uevent;
|
|
return 0;
|
|
}
|
|
subsys_initcall(usb_udc_init);
|
|
|
|
static void __exit usb_udc_exit(void)
|
|
{
|
|
class_destroy(udc_class);
|
|
}
|
|
module_exit(usb_udc_exit);
|
|
|
|
MODULE_DESCRIPTION("UDC Framework");
|
|
MODULE_AUTHOR("Felipe Balbi <balbi@ti.com>");
|
|
MODULE_LICENSE("GPL v2");
|