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1711 lines
46 KiB
1711 lines
46 KiB
// SPDX-License-Identifier: GPL-2.0 |
|
/* |
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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 <[email protected]> |
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*/ |
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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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|
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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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|
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#include "trace.h" |
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|
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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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* @started: the UDC's started state. True if the UDC had started. |
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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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bool started; |
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}; |
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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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|
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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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|
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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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|
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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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/** |
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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 host".) |
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* |
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* This routine must be called in process context. |
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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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|
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if (ep->enabled) |
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goto out; |
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|
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/* UDC drivers can't handle endpoints with maxpacket size 0 */ |
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if (usb_endpoint_maxp(ep->desc) == 0) { |
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/* |
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* We should log an error message here, but we can't call |
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* dev_err() because there's no way to find the gadget |
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* given only ep. |
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*/ |
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ret = -EINVAL; |
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goto out; |
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} |
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|
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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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|
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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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/** |
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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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* This routine must be called in process context. |
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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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|
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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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/** |
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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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|
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req = ep->ops->alloc_request(ep, gfp_flags); |
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|
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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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/** |
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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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trace_usb_ep_free_request(ep, req, 0); |
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ep->ops->free_request(ep, req); |
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} |
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EXPORT_SYMBOL_GPL(usb_ep_free_request); |
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|
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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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* Note that @req's ->complete() callback must never be called from |
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* within usb_ep_queue() as that can create deadlock situations. |
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* |
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* This routine may be called in interrupt context. |
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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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* If and only if @req is successfully queued (the return value is zero), |
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* @req->complete() will be called exactly once, when the Gadget core and |
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* UDC are finished with the request. When the completion function is called, |
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* control of the request is returned to the device driver which submitted it. |
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* The completion handler may then immediately free or reuse @req. |
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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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|
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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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/** |
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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 |
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* eventually its completion routine is called (with status -ECONNRESET); |
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* else a negative error code is returned. This routine is asynchronous, |
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* that is, it may return before the completion routine runs. |
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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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* This routine may be called in interrupt context. |
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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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|
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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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* This routine may be called in interrupt context. |
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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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|
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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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|
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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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/** |
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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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* This routine may be called in interrupt context. |
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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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|
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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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|
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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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/** |
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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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* This routine may be called in interrupt context. |
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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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|
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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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|
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trace_usb_ep_set_wedge(ep, ret); |
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|
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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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/** |
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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 routine may be called in interrupt context. |
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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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* This routine may be called in interrupt context. |
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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); |
|
|
|
trace_usb_ep_fifo_flush(ep, 0); |
|
} |
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EXPORT_SYMBOL_GPL(usb_ep_fifo_flush); |
|
|
|
/* ------------------------------------------------------------------------- */ |
|
|
|
/** |
|
* usb_gadget_frame_number - returns the current frame number |
|
* @gadget: controller that reports the frame number |
|
* |
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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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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); |
|
|
|
/** |
|
* usb_gadget_wakeup - tries to wake up the host connected to this gadget |
|
* @gadget: controller used to wake up the host |
|
* |
|
* Returns zero on success, else negative error code if the hardware |
|
* doesn't support such attempts, or its support has not been enabled |
|
* by the usb host. Drivers must return device descriptors that report |
|
* their ability to support this, or hosts won't enable it. |
|
* |
|
* 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 |
|
* remote wakeup even when hosts don't explicitly enable it. |
|
*/ |
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int usb_gadget_wakeup(struct usb_gadget *gadget) |
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{ |
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int ret = 0; |
|
|
|
if (!gadget->ops->wakeup) { |
|
ret = -EOPNOTSUPP; |
|
goto out; |
|
} |
|
|
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ret = gadget->ops->wakeup(gadget); |
|
|
|
out: |
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trace_usb_gadget_wakeup(gadget, ret); |
|
|
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return ret; |
|
} |
|
EXPORT_SYMBOL_GPL(usb_gadget_wakeup); |
|
|
|
/** |
|
* usb_gadget_set_selfpowered - sets the device selfpowered feature. |
|
* @gadget:the device being declared as self-powered |
|
* |
|
* this affects the device status reported by the hardware driver |
|
* to reflect that it now has a local power supply. |
|
* |
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* returns zero on success, else negative errno. |
|
*/ |
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int usb_gadget_set_selfpowered(struct usb_gadget *gadget) |
|
{ |
|
int ret = 0; |
|
|
|
if (!gadget->ops->set_selfpowered) { |
|
ret = -EOPNOTSUPP; |
|
goto out; |
|
} |
|
|
|
ret = gadget->ops->set_selfpowered(gadget, 1); |
|
|
|
out: |
|
trace_usb_gadget_set_selfpowered(gadget, ret); |
|
|
|
return ret; |
|
} |
|
EXPORT_SYMBOL_GPL(usb_gadget_set_selfpowered); |
|
|
|
/** |
|
* usb_gadget_clear_selfpowered - clear the device selfpowered feature. |
|
* @gadget:the device being declared as bus-powered |
|
* |
|
* this affects the device status reported by the hardware driver. |
|
* some hardware may not support bus-powered operation, in which |
|
* case this feature's value can never change. |
|
* |
|
* 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). |
|
* |
|
* 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. |
|
* |
|
* Following a successful disconnect, invoke the ->disconnect() callback |
|
* for the current gadget driver so that UDC drivers don't need to. |
|
* |
|
* 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->connected) |
|
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; |
|
gadget->udc->driver->disconnect(gadget); |
|
} |
|
|
|
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 |
|
* @ep: the endpoint to be used with with the request |
|
* @req: the request being given back |
|
* |
|
* 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_mult(desc) > 1) |
|
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) |
|
{ |
|
int ret; |
|
|
|
if (udc->started) { |
|
dev_err(&udc->dev, "UDC had already started\n"); |
|
return -EBUSY; |
|
} |
|
|
|
ret = udc->gadget->ops->udc_start(udc->gadget, udc->driver); |
|
if (!ret) |
|
udc->started = true; |
|
|
|
return ret; |
|
} |
|
|
|
/** |
|
* usb_gadget_udc_stop - tells usb device controller we don't need it anymore |
|
* @udc: The UDC to be stopped |
|
* |
|
* 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) |
|
{ |
|
if (!udc->started) { |
|
dev_err(&udc->dev, "UDC had already stopped\n"); |
|
return; |
|
} |
|
|
|
udc->gadget->ops->udc_stop(udc->gadget); |
|
udc->started = false; |
|
} |
|
|
|
/** |
|
* 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) |
|
{ |
|
struct usb_gadget *gadget = udc->gadget; |
|
enum usb_device_speed s; |
|
|
|
if (speed == USB_SPEED_UNKNOWN) |
|
s = gadget->max_speed; |
|
else |
|
s = min(speed, gadget->max_speed); |
|
|
|
if (s == USB_SPEED_SUPER_PLUS && gadget->ops->udc_set_ssp_rate) |
|
gadget->ops->udc_set_ssp_rate(gadget, gadget->max_ssp_rate); |
|
else if (gadget->ops->udc_set_speed) |
|
gadget->ops->udc_set_speed(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_init(&driver->pending); |
|
break; |
|
} |
|
|
|
return ret; |
|
} |
|
|
|
/** |
|
* usb_initialize_gadget - initialize a gadget and its embedded struct device |
|
* @parent: the parent device to this udc. Usually the controller driver's |
|
* device. |
|
* @gadget: the gadget to be initialized. |
|
* @release: a gadget release function. |
|
* |
|
* Returns zero on success, negative errno otherwise. |
|
* Calls the gadget release function in the latter case. |
|
*/ |
|
void usb_initialize_gadget(struct device *parent, struct usb_gadget *gadget, |
|
void (*release)(struct device *dev)) |
|
{ |
|
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); |
|
} |
|
EXPORT_SYMBOL_GPL(usb_initialize_gadget); |
|
|
|
/** |
|
* usb_add_gadget - adds a new gadget to the udc class driver list |
|
* @gadget: the gadget to be added to the list. |
|
* |
|
* Returns zero on success, negative errno otherwise. |
|
* Does not do a final usb_put_gadget() if an error occurs. |
|
*/ |
|
int usb_add_gadget(struct usb_gadget *gadget) |
|
{ |
|
struct usb_udc *udc; |
|
int ret = -ENOMEM; |
|
|
|
udc = kzalloc(sizeof(*udc), GFP_KERNEL); |
|
if (!udc) |
|
goto error; |
|
|
|
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 = gadget->dev.parent; |
|
ret = dev_set_name(&udc->dev, "%s", |
|
kobject_name(&gadget->dev.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; |
|
|
|
udc->started = false; |
|
|
|
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: |
|
flush_work(&gadget->work); |
|
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); |
|
|
|
error: |
|
return ret; |
|
} |
|
EXPORT_SYMBOL_GPL(usb_add_gadget); |
|
|
|
/** |
|
* 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)) |
|
{ |
|
int ret; |
|
|
|
usb_initialize_gadget(parent, gadget, release); |
|
ret = usb_add_gadget(gadget); |
|
if (ret) |
|
usb_put_gadget(gadget); |
|
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); |
|
if (udc->gadget->irq) |
|
synchronize_irq(udc->gadget->irq); |
|
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 - deletes @udc from udc_list |
|
* @gadget: the gadget to be removed. |
|
* |
|
* This will call usb_gadget_unregister_driver() if |
|
* the @udc is still busy. |
|
* It will not do a final usb_put_gadget(). |
|
*/ |
|
void usb_del_gadget(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_del(&gadget->dev); |
|
} |
|
EXPORT_SYMBOL_GPL(usb_del_gadget); |
|
|
|
/** |
|
* usb_del_gadget_udc - deletes @udc from udc_list |
|
* @gadget: the gadget to be removed. |
|
* |
|
* Calls usb_del_gadget() and does a final usb_put_gadget(). |
|
*/ |
|
void usb_del_gadget_udc(struct usb_gadget *gadget) |
|
{ |
|
usb_del_gadget(gadget); |
|
usb_put_gadget(gadget); |
|
} |
|
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); |
|
if (ret) |
|
pr_warn("udc-core: couldn't find an available UDC or it's busy\n"); |
|
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 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_WO(srp); |
|
|
|
static ssize_t soft_connect_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); |
|
ssize_t ret; |
|
|
|
mutex_lock(&udc_lock); |
|
if (!udc->driver) { |
|
dev_err(dev, "soft-connect without a gadget driver\n"); |
|
ret = -EOPNOTSUPP; |
|
goto out; |
|
} |
|
|
|
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); |
|
usb_gadget_udc_stop(udc); |
|
} else { |
|
dev_err(dev, "unsupported command '%s'\n", buf); |
|
ret = -EINVAL; |
|
goto out; |
|
} |
|
|
|
ret = n; |
|
out: |
|
mutex_unlock(&udc_lock); |
|
return ret; |
|
} |
|
static DEVICE_ATTR_WO(soft_connect); |
|
|
|
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 scnprintf(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 scnprintf(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 <[email protected]>"); |
|
MODULE_LICENSE("GPL v2");
|
|
|