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2899 lines
72 KiB
2899 lines
72 KiB
// SPDX-License-Identifier: GPL-2.0+ |
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/* |
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* dummy_hcd.c -- Dummy/Loopback USB host and device emulator driver. |
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* |
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* Maintainer: Alan Stern <[email protected]> |
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* |
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* Copyright (C) 2003 David Brownell |
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* Copyright (C) 2003-2005 Alan Stern |
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*/ |
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/* |
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* This exposes a device side "USB gadget" API, driven by requests to a |
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* Linux-USB host controller driver. USB traffic is simulated; there's |
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* no need for USB hardware. Use this with two other drivers: |
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* |
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* - Gadget driver, responding to requests (device); |
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* - Host-side device driver, as already familiar in Linux. |
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* |
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* Having this all in one kernel can help some stages of development, |
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* bypassing some hardware (and driver) issues. UML could help too. |
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* |
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* Note: The emulation does not include isochronous transfers! |
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*/ |
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#include <linux/module.h> |
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#include <linux/kernel.h> |
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#include <linux/delay.h> |
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#include <linux/ioport.h> |
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#include <linux/slab.h> |
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#include <linux/errno.h> |
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#include <linux/init.h> |
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#include <linux/timer.h> |
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#include <linux/list.h> |
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#include <linux/interrupt.h> |
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#include <linux/platform_device.h> |
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#include <linux/usb.h> |
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#include <linux/usb/gadget.h> |
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#include <linux/usb/hcd.h> |
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#include <linux/scatterlist.h> |
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#include <asm/byteorder.h> |
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#include <linux/io.h> |
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#include <asm/irq.h> |
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#include <asm/unaligned.h> |
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#define DRIVER_DESC "USB Host+Gadget Emulator" |
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#define DRIVER_VERSION "02 May 2005" |
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#define POWER_BUDGET 500 /* in mA; use 8 for low-power port testing */ |
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#define POWER_BUDGET_3 900 /* in mA */ |
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static const char driver_name[] = "dummy_hcd"; |
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static const char driver_desc[] = "USB Host+Gadget Emulator"; |
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static const char gadget_name[] = "dummy_udc"; |
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MODULE_DESCRIPTION(DRIVER_DESC); |
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MODULE_AUTHOR("David Brownell"); |
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MODULE_LICENSE("GPL"); |
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struct dummy_hcd_module_parameters { |
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bool is_super_speed; |
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bool is_high_speed; |
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unsigned int num; |
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}; |
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static struct dummy_hcd_module_parameters mod_data = { |
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.is_super_speed = false, |
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.is_high_speed = true, |
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.num = 1, |
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}; |
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module_param_named(is_super_speed, mod_data.is_super_speed, bool, S_IRUGO); |
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MODULE_PARM_DESC(is_super_speed, "true to simulate SuperSpeed connection"); |
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module_param_named(is_high_speed, mod_data.is_high_speed, bool, S_IRUGO); |
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MODULE_PARM_DESC(is_high_speed, "true to simulate HighSpeed connection"); |
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module_param_named(num, mod_data.num, uint, S_IRUGO); |
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MODULE_PARM_DESC(num, "number of emulated controllers"); |
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/*-------------------------------------------------------------------------*/ |
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|
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/* gadget side driver data structres */ |
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struct dummy_ep { |
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struct list_head queue; |
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unsigned long last_io; /* jiffies timestamp */ |
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struct usb_gadget *gadget; |
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const struct usb_endpoint_descriptor *desc; |
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struct usb_ep ep; |
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unsigned halted:1; |
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unsigned wedged:1; |
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unsigned already_seen:1; |
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unsigned setup_stage:1; |
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unsigned stream_en:1; |
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}; |
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struct dummy_request { |
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struct list_head queue; /* ep's requests */ |
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struct usb_request req; |
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}; |
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static inline struct dummy_ep *usb_ep_to_dummy_ep(struct usb_ep *_ep) |
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{ |
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return container_of(_ep, struct dummy_ep, ep); |
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} |
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static inline struct dummy_request *usb_request_to_dummy_request |
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(struct usb_request *_req) |
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{ |
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return container_of(_req, struct dummy_request, req); |
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} |
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/*-------------------------------------------------------------------------*/ |
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/* |
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* Every device has ep0 for control requests, plus up to 30 more endpoints, |
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* in one of two types: |
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* |
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* - Configurable: direction (in/out), type (bulk, iso, etc), and endpoint |
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* number can be changed. Names like "ep-a" are used for this type. |
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* |
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* - Fixed Function: in other cases. some characteristics may be mutable; |
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* that'd be hardware-specific. Names like "ep12out-bulk" are used. |
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* |
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* Gadget drivers are responsible for not setting up conflicting endpoint |
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* configurations, illegal or unsupported packet lengths, and so on. |
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*/ |
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static const char ep0name[] = "ep0"; |
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static const struct { |
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const char *name; |
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const struct usb_ep_caps caps; |
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} ep_info[] = { |
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#define EP_INFO(_name, _caps) \ |
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{ \ |
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.name = _name, \ |
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.caps = _caps, \ |
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} |
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/* we don't provide isochronous endpoints since we don't support them */ |
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#define TYPE_BULK_OR_INT (USB_EP_CAPS_TYPE_BULK | USB_EP_CAPS_TYPE_INT) |
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/* everyone has ep0 */ |
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EP_INFO(ep0name, |
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USB_EP_CAPS(USB_EP_CAPS_TYPE_CONTROL, USB_EP_CAPS_DIR_ALL)), |
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/* act like a pxa250: fifteen fixed function endpoints */ |
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EP_INFO("ep1in-bulk", |
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USB_EP_CAPS(USB_EP_CAPS_TYPE_BULK, USB_EP_CAPS_DIR_IN)), |
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EP_INFO("ep2out-bulk", |
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USB_EP_CAPS(USB_EP_CAPS_TYPE_BULK, USB_EP_CAPS_DIR_OUT)), |
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/* |
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EP_INFO("ep3in-iso", |
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USB_EP_CAPS(USB_EP_CAPS_TYPE_ISO, USB_EP_CAPS_DIR_IN)), |
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EP_INFO("ep4out-iso", |
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USB_EP_CAPS(USB_EP_CAPS_TYPE_ISO, USB_EP_CAPS_DIR_OUT)), |
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*/ |
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EP_INFO("ep5in-int", |
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USB_EP_CAPS(USB_EP_CAPS_TYPE_INT, USB_EP_CAPS_DIR_IN)), |
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EP_INFO("ep6in-bulk", |
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USB_EP_CAPS(USB_EP_CAPS_TYPE_BULK, USB_EP_CAPS_DIR_IN)), |
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EP_INFO("ep7out-bulk", |
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USB_EP_CAPS(USB_EP_CAPS_TYPE_BULK, USB_EP_CAPS_DIR_OUT)), |
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/* |
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EP_INFO("ep8in-iso", |
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USB_EP_CAPS(USB_EP_CAPS_TYPE_ISO, USB_EP_CAPS_DIR_IN)), |
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EP_INFO("ep9out-iso", |
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USB_EP_CAPS(USB_EP_CAPS_TYPE_ISO, USB_EP_CAPS_DIR_OUT)), |
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*/ |
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EP_INFO("ep10in-int", |
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USB_EP_CAPS(USB_EP_CAPS_TYPE_INT, USB_EP_CAPS_DIR_IN)), |
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EP_INFO("ep11in-bulk", |
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USB_EP_CAPS(USB_EP_CAPS_TYPE_BULK, USB_EP_CAPS_DIR_IN)), |
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EP_INFO("ep12out-bulk", |
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USB_EP_CAPS(USB_EP_CAPS_TYPE_BULK, USB_EP_CAPS_DIR_OUT)), |
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/* |
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EP_INFO("ep13in-iso", |
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USB_EP_CAPS(USB_EP_CAPS_TYPE_ISO, USB_EP_CAPS_DIR_IN)), |
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EP_INFO("ep14out-iso", |
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USB_EP_CAPS(USB_EP_CAPS_TYPE_ISO, USB_EP_CAPS_DIR_OUT)), |
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*/ |
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EP_INFO("ep15in-int", |
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USB_EP_CAPS(USB_EP_CAPS_TYPE_INT, USB_EP_CAPS_DIR_IN)), |
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|
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/* or like sa1100: two fixed function endpoints */ |
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EP_INFO("ep1out-bulk", |
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USB_EP_CAPS(USB_EP_CAPS_TYPE_BULK, USB_EP_CAPS_DIR_OUT)), |
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EP_INFO("ep2in-bulk", |
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USB_EP_CAPS(USB_EP_CAPS_TYPE_BULK, USB_EP_CAPS_DIR_IN)), |
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/* and now some generic EPs so we have enough in multi config */ |
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EP_INFO("ep-aout", |
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USB_EP_CAPS(TYPE_BULK_OR_INT, USB_EP_CAPS_DIR_OUT)), |
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EP_INFO("ep-bin", |
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USB_EP_CAPS(TYPE_BULK_OR_INT, USB_EP_CAPS_DIR_IN)), |
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EP_INFO("ep-cout", |
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USB_EP_CAPS(TYPE_BULK_OR_INT, USB_EP_CAPS_DIR_OUT)), |
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EP_INFO("ep-dout", |
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USB_EP_CAPS(TYPE_BULK_OR_INT, USB_EP_CAPS_DIR_OUT)), |
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EP_INFO("ep-ein", |
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USB_EP_CAPS(TYPE_BULK_OR_INT, USB_EP_CAPS_DIR_IN)), |
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EP_INFO("ep-fout", |
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USB_EP_CAPS(TYPE_BULK_OR_INT, USB_EP_CAPS_DIR_OUT)), |
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EP_INFO("ep-gin", |
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USB_EP_CAPS(TYPE_BULK_OR_INT, USB_EP_CAPS_DIR_IN)), |
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EP_INFO("ep-hout", |
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USB_EP_CAPS(TYPE_BULK_OR_INT, USB_EP_CAPS_DIR_OUT)), |
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EP_INFO("ep-iout", |
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USB_EP_CAPS(TYPE_BULK_OR_INT, USB_EP_CAPS_DIR_OUT)), |
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EP_INFO("ep-jin", |
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USB_EP_CAPS(TYPE_BULK_OR_INT, USB_EP_CAPS_DIR_IN)), |
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EP_INFO("ep-kout", |
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USB_EP_CAPS(TYPE_BULK_OR_INT, USB_EP_CAPS_DIR_OUT)), |
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EP_INFO("ep-lin", |
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USB_EP_CAPS(TYPE_BULK_OR_INT, USB_EP_CAPS_DIR_IN)), |
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EP_INFO("ep-mout", |
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USB_EP_CAPS(TYPE_BULK_OR_INT, USB_EP_CAPS_DIR_OUT)), |
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#undef EP_INFO |
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}; |
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#define DUMMY_ENDPOINTS ARRAY_SIZE(ep_info) |
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/*-------------------------------------------------------------------------*/ |
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#define FIFO_SIZE 64 |
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struct urbp { |
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struct urb *urb; |
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struct list_head urbp_list; |
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struct sg_mapping_iter miter; |
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u32 miter_started; |
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}; |
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enum dummy_rh_state { |
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DUMMY_RH_RESET, |
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DUMMY_RH_SUSPENDED, |
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DUMMY_RH_RUNNING |
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}; |
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struct dummy_hcd { |
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struct dummy *dum; |
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enum dummy_rh_state rh_state; |
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struct timer_list timer; |
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u32 port_status; |
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u32 old_status; |
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unsigned long re_timeout; |
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struct usb_device *udev; |
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struct list_head urbp_list; |
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struct urbp *next_frame_urbp; |
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u32 stream_en_ep; |
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u8 num_stream[30 / 2]; |
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unsigned active:1; |
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unsigned old_active:1; |
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unsigned resuming:1; |
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}; |
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struct dummy { |
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spinlock_t lock; |
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/* |
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* DEVICE/GADGET side support |
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*/ |
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struct dummy_ep ep[DUMMY_ENDPOINTS]; |
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int address; |
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int callback_usage; |
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struct usb_gadget gadget; |
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struct usb_gadget_driver *driver; |
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struct dummy_request fifo_req; |
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u8 fifo_buf[FIFO_SIZE]; |
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u16 devstatus; |
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unsigned ints_enabled:1; |
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unsigned udc_suspended:1; |
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unsigned pullup:1; |
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/* |
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* HOST side support |
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*/ |
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struct dummy_hcd *hs_hcd; |
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struct dummy_hcd *ss_hcd; |
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}; |
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static inline struct dummy_hcd *hcd_to_dummy_hcd(struct usb_hcd *hcd) |
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{ |
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return (struct dummy_hcd *) (hcd->hcd_priv); |
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} |
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static inline struct usb_hcd *dummy_hcd_to_hcd(struct dummy_hcd *dum) |
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{ |
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return container_of((void *) dum, struct usb_hcd, hcd_priv); |
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} |
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static inline struct device *dummy_dev(struct dummy_hcd *dum) |
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{ |
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return dummy_hcd_to_hcd(dum)->self.controller; |
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} |
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static inline struct device *udc_dev(struct dummy *dum) |
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{ |
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return dum->gadget.dev.parent; |
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} |
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static inline struct dummy *ep_to_dummy(struct dummy_ep *ep) |
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{ |
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return container_of(ep->gadget, struct dummy, gadget); |
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} |
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static inline struct dummy_hcd *gadget_to_dummy_hcd(struct usb_gadget *gadget) |
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{ |
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struct dummy *dum = container_of(gadget, struct dummy, gadget); |
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if (dum->gadget.speed == USB_SPEED_SUPER) |
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return dum->ss_hcd; |
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else |
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return dum->hs_hcd; |
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} |
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static inline struct dummy *gadget_dev_to_dummy(struct device *dev) |
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{ |
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return container_of(dev, struct dummy, gadget.dev); |
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} |
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/*-------------------------------------------------------------------------*/ |
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/* DEVICE/GADGET SIDE UTILITY ROUTINES */ |
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/* called with spinlock held */ |
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static void nuke(struct dummy *dum, struct dummy_ep *ep) |
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{ |
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while (!list_empty(&ep->queue)) { |
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struct dummy_request *req; |
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req = list_entry(ep->queue.next, struct dummy_request, queue); |
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list_del_init(&req->queue); |
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req->req.status = -ESHUTDOWN; |
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spin_unlock(&dum->lock); |
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usb_gadget_giveback_request(&ep->ep, &req->req); |
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spin_lock(&dum->lock); |
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} |
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} |
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/* caller must hold lock */ |
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static void stop_activity(struct dummy *dum) |
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{ |
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int i; |
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/* prevent any more requests */ |
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dum->address = 0; |
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/* The timer is left running so that outstanding URBs can fail */ |
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/* nuke any pending requests first, so driver i/o is quiesced */ |
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for (i = 0; i < DUMMY_ENDPOINTS; ++i) |
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nuke(dum, &dum->ep[i]); |
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|
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/* driver now does any non-usb quiescing necessary */ |
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} |
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/** |
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* set_link_state_by_speed() - Sets the current state of the link according to |
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* the hcd speed |
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* @dum_hcd: pointer to the dummy_hcd structure to update the link state for |
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* |
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* This function updates the port_status according to the link state and the |
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* speed of the hcd. |
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*/ |
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static void set_link_state_by_speed(struct dummy_hcd *dum_hcd) |
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{ |
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struct dummy *dum = dum_hcd->dum; |
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if (dummy_hcd_to_hcd(dum_hcd)->speed == HCD_USB3) { |
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if ((dum_hcd->port_status & USB_SS_PORT_STAT_POWER) == 0) { |
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dum_hcd->port_status = 0; |
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} else if (!dum->pullup || dum->udc_suspended) { |
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/* UDC suspend must cause a disconnect */ |
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dum_hcd->port_status &= ~(USB_PORT_STAT_CONNECTION | |
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USB_PORT_STAT_ENABLE); |
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if ((dum_hcd->old_status & |
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USB_PORT_STAT_CONNECTION) != 0) |
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dum_hcd->port_status |= |
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(USB_PORT_STAT_C_CONNECTION << 16); |
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} else { |
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/* device is connected and not suspended */ |
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dum_hcd->port_status |= (USB_PORT_STAT_CONNECTION | |
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USB_PORT_STAT_SPEED_5GBPS) ; |
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if ((dum_hcd->old_status & |
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USB_PORT_STAT_CONNECTION) == 0) |
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dum_hcd->port_status |= |
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(USB_PORT_STAT_C_CONNECTION << 16); |
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if ((dum_hcd->port_status & USB_PORT_STAT_ENABLE) && |
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(dum_hcd->port_status & |
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USB_PORT_STAT_LINK_STATE) == USB_SS_PORT_LS_U0 && |
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dum_hcd->rh_state != DUMMY_RH_SUSPENDED) |
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dum_hcd->active = 1; |
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} |
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} else { |
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if ((dum_hcd->port_status & USB_PORT_STAT_POWER) == 0) { |
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dum_hcd->port_status = 0; |
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} else if (!dum->pullup || dum->udc_suspended) { |
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/* UDC suspend must cause a disconnect */ |
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dum_hcd->port_status &= ~(USB_PORT_STAT_CONNECTION | |
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USB_PORT_STAT_ENABLE | |
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USB_PORT_STAT_LOW_SPEED | |
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USB_PORT_STAT_HIGH_SPEED | |
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USB_PORT_STAT_SUSPEND); |
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if ((dum_hcd->old_status & |
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USB_PORT_STAT_CONNECTION) != 0) |
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dum_hcd->port_status |= |
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(USB_PORT_STAT_C_CONNECTION << 16); |
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} else { |
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dum_hcd->port_status |= USB_PORT_STAT_CONNECTION; |
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if ((dum_hcd->old_status & |
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USB_PORT_STAT_CONNECTION) == 0) |
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dum_hcd->port_status |= |
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(USB_PORT_STAT_C_CONNECTION << 16); |
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if ((dum_hcd->port_status & USB_PORT_STAT_ENABLE) == 0) |
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dum_hcd->port_status &= ~USB_PORT_STAT_SUSPEND; |
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else if ((dum_hcd->port_status & |
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USB_PORT_STAT_SUSPEND) == 0 && |
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dum_hcd->rh_state != DUMMY_RH_SUSPENDED) |
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dum_hcd->active = 1; |
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} |
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} |
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} |
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|
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/* caller must hold lock */ |
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static void set_link_state(struct dummy_hcd *dum_hcd) |
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__must_hold(&dum->lock) |
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{ |
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struct dummy *dum = dum_hcd->dum; |
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unsigned int power_bit; |
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|
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dum_hcd->active = 0; |
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if (dum->pullup) |
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if ((dummy_hcd_to_hcd(dum_hcd)->speed == HCD_USB3 && |
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dum->gadget.speed != USB_SPEED_SUPER) || |
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(dummy_hcd_to_hcd(dum_hcd)->speed != HCD_USB3 && |
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dum->gadget.speed == USB_SPEED_SUPER)) |
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return; |
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|
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set_link_state_by_speed(dum_hcd); |
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power_bit = (dummy_hcd_to_hcd(dum_hcd)->speed == HCD_USB3 ? |
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USB_SS_PORT_STAT_POWER : USB_PORT_STAT_POWER); |
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|
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if ((dum_hcd->port_status & USB_PORT_STAT_ENABLE) == 0 || |
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dum_hcd->active) |
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dum_hcd->resuming = 0; |
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|
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/* Currently !connected or in reset */ |
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if ((dum_hcd->port_status & power_bit) == 0 || |
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(dum_hcd->port_status & USB_PORT_STAT_RESET) != 0) { |
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unsigned int disconnect = power_bit & |
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dum_hcd->old_status & (~dum_hcd->port_status); |
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unsigned int reset = USB_PORT_STAT_RESET & |
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(~dum_hcd->old_status) & dum_hcd->port_status; |
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|
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/* Report reset and disconnect events to the driver */ |
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if (dum->ints_enabled && (disconnect || reset)) { |
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stop_activity(dum); |
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++dum->callback_usage; |
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spin_unlock(&dum->lock); |
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if (reset) |
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usb_gadget_udc_reset(&dum->gadget, dum->driver); |
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else |
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dum->driver->disconnect(&dum->gadget); |
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spin_lock(&dum->lock); |
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--dum->callback_usage; |
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} |
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} else if (dum_hcd->active != dum_hcd->old_active && |
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dum->ints_enabled) { |
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++dum->callback_usage; |
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spin_unlock(&dum->lock); |
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if (dum_hcd->old_active && dum->driver->suspend) |
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dum->driver->suspend(&dum->gadget); |
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else if (!dum_hcd->old_active && dum->driver->resume) |
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dum->driver->resume(&dum->gadget); |
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spin_lock(&dum->lock); |
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--dum->callback_usage; |
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} |
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|
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dum_hcd->old_status = dum_hcd->port_status; |
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dum_hcd->old_active = dum_hcd->active; |
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} |
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|
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/*-------------------------------------------------------------------------*/ |
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|
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/* DEVICE/GADGET SIDE DRIVER |
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* |
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* This only tracks gadget state. All the work is done when the host |
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* side tries some (emulated) i/o operation. Real device controller |
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* drivers would do real i/o using dma, fifos, irqs, timers, etc. |
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*/ |
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|
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#define is_enabled(dum) \ |
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(dum->port_status & USB_PORT_STAT_ENABLE) |
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|
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static int dummy_enable(struct usb_ep *_ep, |
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const struct usb_endpoint_descriptor *desc) |
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{ |
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struct dummy *dum; |
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struct dummy_hcd *dum_hcd; |
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struct dummy_ep *ep; |
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unsigned max; |
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int retval; |
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|
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ep = usb_ep_to_dummy_ep(_ep); |
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if (!_ep || !desc || ep->desc || _ep->name == ep0name |
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|| desc->bDescriptorType != USB_DT_ENDPOINT) |
|
return -EINVAL; |
|
dum = ep_to_dummy(ep); |
|
if (!dum->driver) |
|
return -ESHUTDOWN; |
|
|
|
dum_hcd = gadget_to_dummy_hcd(&dum->gadget); |
|
if (!is_enabled(dum_hcd)) |
|
return -ESHUTDOWN; |
|
|
|
/* |
|
* For HS/FS devices only bits 0..10 of the wMaxPacketSize represent the |
|
* maximum packet size. |
|
* For SS devices the wMaxPacketSize is limited by 1024. |
|
*/ |
|
max = usb_endpoint_maxp(desc); |
|
|
|
/* drivers must not request bad settings, since lower levels |
|
* (hardware or its drivers) may not check. some endpoints |
|
* can't do iso, many have maxpacket limitations, etc. |
|
* |
|
* since this "hardware" driver is here to help debugging, we |
|
* have some extra sanity checks. (there could be more though, |
|
* especially for "ep9out" style fixed function ones.) |
|
*/ |
|
retval = -EINVAL; |
|
switch (usb_endpoint_type(desc)) { |
|
case USB_ENDPOINT_XFER_BULK: |
|
if (strstr(ep->ep.name, "-iso") |
|
|| strstr(ep->ep.name, "-int")) { |
|
goto done; |
|
} |
|
switch (dum->gadget.speed) { |
|
case USB_SPEED_SUPER: |
|
if (max == 1024) |
|
break; |
|
goto done; |
|
case USB_SPEED_HIGH: |
|
if (max == 512) |
|
break; |
|
goto done; |
|
case USB_SPEED_FULL: |
|
if (max == 8 || max == 16 || max == 32 || max == 64) |
|
/* we'll fake any legal size */ |
|
break; |
|
/* save a return statement */ |
|
fallthrough; |
|
default: |
|
goto done; |
|
} |
|
break; |
|
case USB_ENDPOINT_XFER_INT: |
|
if (strstr(ep->ep.name, "-iso")) /* bulk is ok */ |
|
goto done; |
|
/* real hardware might not handle all packet sizes */ |
|
switch (dum->gadget.speed) { |
|
case USB_SPEED_SUPER: |
|
case USB_SPEED_HIGH: |
|
if (max <= 1024) |
|
break; |
|
/* save a return statement */ |
|
fallthrough; |
|
case USB_SPEED_FULL: |
|
if (max <= 64) |
|
break; |
|
/* save a return statement */ |
|
fallthrough; |
|
default: |
|
if (max <= 8) |
|
break; |
|
goto done; |
|
} |
|
break; |
|
case USB_ENDPOINT_XFER_ISOC: |
|
if (strstr(ep->ep.name, "-bulk") |
|
|| strstr(ep->ep.name, "-int")) |
|
goto done; |
|
/* real hardware might not handle all packet sizes */ |
|
switch (dum->gadget.speed) { |
|
case USB_SPEED_SUPER: |
|
case USB_SPEED_HIGH: |
|
if (max <= 1024) |
|
break; |
|
/* save a return statement */ |
|
fallthrough; |
|
case USB_SPEED_FULL: |
|
if (max <= 1023) |
|
break; |
|
/* save a return statement */ |
|
fallthrough; |
|
default: |
|
goto done; |
|
} |
|
break; |
|
default: |
|
/* few chips support control except on ep0 */ |
|
goto done; |
|
} |
|
|
|
_ep->maxpacket = max; |
|
if (usb_ss_max_streams(_ep->comp_desc)) { |
|
if (!usb_endpoint_xfer_bulk(desc)) { |
|
dev_err(udc_dev(dum), "Can't enable stream support on " |
|
"non-bulk ep %s\n", _ep->name); |
|
return -EINVAL; |
|
} |
|
ep->stream_en = 1; |
|
} |
|
ep->desc = desc; |
|
|
|
dev_dbg(udc_dev(dum), "enabled %s (ep%d%s-%s) maxpacket %d stream %s\n", |
|
_ep->name, |
|
desc->bEndpointAddress & 0x0f, |
|
(desc->bEndpointAddress & USB_DIR_IN) ? "in" : "out", |
|
usb_ep_type_string(usb_endpoint_type(desc)), |
|
max, ep->stream_en ? "enabled" : "disabled"); |
|
|
|
/* at this point real hardware should be NAKing transfers |
|
* to that endpoint, until a buffer is queued to it. |
|
*/ |
|
ep->halted = ep->wedged = 0; |
|
retval = 0; |
|
done: |
|
return retval; |
|
} |
|
|
|
static int dummy_disable(struct usb_ep *_ep) |
|
{ |
|
struct dummy_ep *ep; |
|
struct dummy *dum; |
|
unsigned long flags; |
|
|
|
ep = usb_ep_to_dummy_ep(_ep); |
|
if (!_ep || !ep->desc || _ep->name == ep0name) |
|
return -EINVAL; |
|
dum = ep_to_dummy(ep); |
|
|
|
spin_lock_irqsave(&dum->lock, flags); |
|
ep->desc = NULL; |
|
ep->stream_en = 0; |
|
nuke(dum, ep); |
|
spin_unlock_irqrestore(&dum->lock, flags); |
|
|
|
dev_dbg(udc_dev(dum), "disabled %s\n", _ep->name); |
|
return 0; |
|
} |
|
|
|
static struct usb_request *dummy_alloc_request(struct usb_ep *_ep, |
|
gfp_t mem_flags) |
|
{ |
|
struct dummy_request *req; |
|
|
|
if (!_ep) |
|
return NULL; |
|
|
|
req = kzalloc(sizeof(*req), mem_flags); |
|
if (!req) |
|
return NULL; |
|
INIT_LIST_HEAD(&req->queue); |
|
return &req->req; |
|
} |
|
|
|
static void dummy_free_request(struct usb_ep *_ep, struct usb_request *_req) |
|
{ |
|
struct dummy_request *req; |
|
|
|
if (!_ep || !_req) { |
|
WARN_ON(1); |
|
return; |
|
} |
|
|
|
req = usb_request_to_dummy_request(_req); |
|
WARN_ON(!list_empty(&req->queue)); |
|
kfree(req); |
|
} |
|
|
|
static void fifo_complete(struct usb_ep *ep, struct usb_request *req) |
|
{ |
|
} |
|
|
|
static int dummy_queue(struct usb_ep *_ep, struct usb_request *_req, |
|
gfp_t mem_flags) |
|
{ |
|
struct dummy_ep *ep; |
|
struct dummy_request *req; |
|
struct dummy *dum; |
|
struct dummy_hcd *dum_hcd; |
|
unsigned long flags; |
|
|
|
req = usb_request_to_dummy_request(_req); |
|
if (!_req || !list_empty(&req->queue) || !_req->complete) |
|
return -EINVAL; |
|
|
|
ep = usb_ep_to_dummy_ep(_ep); |
|
if (!_ep || (!ep->desc && _ep->name != ep0name)) |
|
return -EINVAL; |
|
|
|
dum = ep_to_dummy(ep); |
|
dum_hcd = gadget_to_dummy_hcd(&dum->gadget); |
|
if (!dum->driver || !is_enabled(dum_hcd)) |
|
return -ESHUTDOWN; |
|
|
|
#if 0 |
|
dev_dbg(udc_dev(dum), "ep %p queue req %p to %s, len %d buf %p\n", |
|
ep, _req, _ep->name, _req->length, _req->buf); |
|
#endif |
|
_req->status = -EINPROGRESS; |
|
_req->actual = 0; |
|
spin_lock_irqsave(&dum->lock, flags); |
|
|
|
/* implement an emulated single-request FIFO */ |
|
if (ep->desc && (ep->desc->bEndpointAddress & USB_DIR_IN) && |
|
list_empty(&dum->fifo_req.queue) && |
|
list_empty(&ep->queue) && |
|
_req->length <= FIFO_SIZE) { |
|
req = &dum->fifo_req; |
|
req->req = *_req; |
|
req->req.buf = dum->fifo_buf; |
|
memcpy(dum->fifo_buf, _req->buf, _req->length); |
|
req->req.context = dum; |
|
req->req.complete = fifo_complete; |
|
|
|
list_add_tail(&req->queue, &ep->queue); |
|
spin_unlock(&dum->lock); |
|
_req->actual = _req->length; |
|
_req->status = 0; |
|
usb_gadget_giveback_request(_ep, _req); |
|
spin_lock(&dum->lock); |
|
} else |
|
list_add_tail(&req->queue, &ep->queue); |
|
spin_unlock_irqrestore(&dum->lock, flags); |
|
|
|
/* real hardware would likely enable transfers here, in case |
|
* it'd been left NAKing. |
|
*/ |
|
return 0; |
|
} |
|
|
|
static int dummy_dequeue(struct usb_ep *_ep, struct usb_request *_req) |
|
{ |
|
struct dummy_ep *ep; |
|
struct dummy *dum; |
|
int retval = -EINVAL; |
|
unsigned long flags; |
|
struct dummy_request *req = NULL; |
|
|
|
if (!_ep || !_req) |
|
return retval; |
|
ep = usb_ep_to_dummy_ep(_ep); |
|
dum = ep_to_dummy(ep); |
|
|
|
if (!dum->driver) |
|
return -ESHUTDOWN; |
|
|
|
local_irq_save(flags); |
|
spin_lock(&dum->lock); |
|
list_for_each_entry(req, &ep->queue, queue) { |
|
if (&req->req == _req) { |
|
list_del_init(&req->queue); |
|
_req->status = -ECONNRESET; |
|
retval = 0; |
|
break; |
|
} |
|
} |
|
spin_unlock(&dum->lock); |
|
|
|
if (retval == 0) { |
|
dev_dbg(udc_dev(dum), |
|
"dequeued req %p from %s, len %d buf %p\n", |
|
req, _ep->name, _req->length, _req->buf); |
|
usb_gadget_giveback_request(_ep, _req); |
|
} |
|
local_irq_restore(flags); |
|
return retval; |
|
} |
|
|
|
static int |
|
dummy_set_halt_and_wedge(struct usb_ep *_ep, int value, int wedged) |
|
{ |
|
struct dummy_ep *ep; |
|
struct dummy *dum; |
|
|
|
if (!_ep) |
|
return -EINVAL; |
|
ep = usb_ep_to_dummy_ep(_ep); |
|
dum = ep_to_dummy(ep); |
|
if (!dum->driver) |
|
return -ESHUTDOWN; |
|
if (!value) |
|
ep->halted = ep->wedged = 0; |
|
else if (ep->desc && (ep->desc->bEndpointAddress & USB_DIR_IN) && |
|
!list_empty(&ep->queue)) |
|
return -EAGAIN; |
|
else { |
|
ep->halted = 1; |
|
if (wedged) |
|
ep->wedged = 1; |
|
} |
|
/* FIXME clear emulated data toggle too */ |
|
return 0; |
|
} |
|
|
|
static int |
|
dummy_set_halt(struct usb_ep *_ep, int value) |
|
{ |
|
return dummy_set_halt_and_wedge(_ep, value, 0); |
|
} |
|
|
|
static int dummy_set_wedge(struct usb_ep *_ep) |
|
{ |
|
if (!_ep || _ep->name == ep0name) |
|
return -EINVAL; |
|
return dummy_set_halt_and_wedge(_ep, 1, 1); |
|
} |
|
|
|
static const struct usb_ep_ops dummy_ep_ops = { |
|
.enable = dummy_enable, |
|
.disable = dummy_disable, |
|
|
|
.alloc_request = dummy_alloc_request, |
|
.free_request = dummy_free_request, |
|
|
|
.queue = dummy_queue, |
|
.dequeue = dummy_dequeue, |
|
|
|
.set_halt = dummy_set_halt, |
|
.set_wedge = dummy_set_wedge, |
|
}; |
|
|
|
/*-------------------------------------------------------------------------*/ |
|
|
|
/* there are both host and device side versions of this call ... */ |
|
static int dummy_g_get_frame(struct usb_gadget *_gadget) |
|
{ |
|
struct timespec64 ts64; |
|
|
|
ktime_get_ts64(&ts64); |
|
return ts64.tv_nsec / NSEC_PER_MSEC; |
|
} |
|
|
|
static int dummy_wakeup(struct usb_gadget *_gadget) |
|
{ |
|
struct dummy_hcd *dum_hcd; |
|
|
|
dum_hcd = gadget_to_dummy_hcd(_gadget); |
|
if (!(dum_hcd->dum->devstatus & ((1 << USB_DEVICE_B_HNP_ENABLE) |
|
| (1 << USB_DEVICE_REMOTE_WAKEUP)))) |
|
return -EINVAL; |
|
if ((dum_hcd->port_status & USB_PORT_STAT_CONNECTION) == 0) |
|
return -ENOLINK; |
|
if ((dum_hcd->port_status & USB_PORT_STAT_SUSPEND) == 0 && |
|
dum_hcd->rh_state != DUMMY_RH_SUSPENDED) |
|
return -EIO; |
|
|
|
/* FIXME: What if the root hub is suspended but the port isn't? */ |
|
|
|
/* hub notices our request, issues downstream resume, etc */ |
|
dum_hcd->resuming = 1; |
|
dum_hcd->re_timeout = jiffies + msecs_to_jiffies(20); |
|
mod_timer(&dummy_hcd_to_hcd(dum_hcd)->rh_timer, dum_hcd->re_timeout); |
|
return 0; |
|
} |
|
|
|
static int dummy_set_selfpowered(struct usb_gadget *_gadget, int value) |
|
{ |
|
struct dummy *dum; |
|
|
|
_gadget->is_selfpowered = (value != 0); |
|
dum = gadget_to_dummy_hcd(_gadget)->dum; |
|
if (value) |
|
dum->devstatus |= (1 << USB_DEVICE_SELF_POWERED); |
|
else |
|
dum->devstatus &= ~(1 << USB_DEVICE_SELF_POWERED); |
|
return 0; |
|
} |
|
|
|
static void dummy_udc_update_ep0(struct dummy *dum) |
|
{ |
|
if (dum->gadget.speed == USB_SPEED_SUPER) |
|
dum->ep[0].ep.maxpacket = 9; |
|
else |
|
dum->ep[0].ep.maxpacket = 64; |
|
} |
|
|
|
static int dummy_pullup(struct usb_gadget *_gadget, int value) |
|
{ |
|
struct dummy_hcd *dum_hcd; |
|
struct dummy *dum; |
|
unsigned long flags; |
|
|
|
dum = gadget_dev_to_dummy(&_gadget->dev); |
|
dum_hcd = gadget_to_dummy_hcd(_gadget); |
|
|
|
spin_lock_irqsave(&dum->lock, flags); |
|
dum->pullup = (value != 0); |
|
set_link_state(dum_hcd); |
|
if (value == 0) { |
|
/* |
|
* Emulate synchronize_irq(): wait for callbacks to finish. |
|
* This seems to be the best place to emulate the call to |
|
* synchronize_irq() that's in usb_gadget_remove_driver(). |
|
* Doing it in dummy_udc_stop() would be too late since it |
|
* is called after the unbind callback and unbind shouldn't |
|
* be invoked until all the other callbacks are finished. |
|
*/ |
|
while (dum->callback_usage > 0) { |
|
spin_unlock_irqrestore(&dum->lock, flags); |
|
usleep_range(1000, 2000); |
|
spin_lock_irqsave(&dum->lock, flags); |
|
} |
|
} |
|
spin_unlock_irqrestore(&dum->lock, flags); |
|
|
|
usb_hcd_poll_rh_status(dummy_hcd_to_hcd(dum_hcd)); |
|
return 0; |
|
} |
|
|
|
static void dummy_udc_set_speed(struct usb_gadget *_gadget, |
|
enum usb_device_speed speed) |
|
{ |
|
struct dummy *dum; |
|
|
|
dum = gadget_dev_to_dummy(&_gadget->dev); |
|
dum->gadget.speed = speed; |
|
dummy_udc_update_ep0(dum); |
|
} |
|
|
|
static int dummy_udc_start(struct usb_gadget *g, |
|
struct usb_gadget_driver *driver); |
|
static int dummy_udc_stop(struct usb_gadget *g); |
|
|
|
static const struct usb_gadget_ops dummy_ops = { |
|
.get_frame = dummy_g_get_frame, |
|
.wakeup = dummy_wakeup, |
|
.set_selfpowered = dummy_set_selfpowered, |
|
.pullup = dummy_pullup, |
|
.udc_start = dummy_udc_start, |
|
.udc_stop = dummy_udc_stop, |
|
.udc_set_speed = dummy_udc_set_speed, |
|
}; |
|
|
|
/*-------------------------------------------------------------------------*/ |
|
|
|
/* "function" sysfs attribute */ |
|
static ssize_t function_show(struct device *dev, struct device_attribute *attr, |
|
char *buf) |
|
{ |
|
struct dummy *dum = gadget_dev_to_dummy(dev); |
|
|
|
if (!dum->driver || !dum->driver->function) |
|
return 0; |
|
return scnprintf(buf, PAGE_SIZE, "%s\n", dum->driver->function); |
|
} |
|
static DEVICE_ATTR_RO(function); |
|
|
|
/*-------------------------------------------------------------------------*/ |
|
|
|
/* |
|
* Driver registration/unregistration. |
|
* |
|
* This is basically hardware-specific; there's usually only one real USB |
|
* device (not host) controller since that's how USB devices are intended |
|
* to work. So most implementations of these api calls will rely on the |
|
* fact that only one driver will ever bind to the hardware. But curious |
|
* hardware can be built with discrete components, so the gadget API doesn't |
|
* require that assumption. |
|
* |
|
* For this emulator, it might be convenient to create a usb device |
|
* for each driver that registers: just add to a big root hub. |
|
*/ |
|
|
|
static int dummy_udc_start(struct usb_gadget *g, |
|
struct usb_gadget_driver *driver) |
|
{ |
|
struct dummy_hcd *dum_hcd = gadget_to_dummy_hcd(g); |
|
struct dummy *dum = dum_hcd->dum; |
|
|
|
switch (g->speed) { |
|
/* All the speeds we support */ |
|
case USB_SPEED_LOW: |
|
case USB_SPEED_FULL: |
|
case USB_SPEED_HIGH: |
|
case USB_SPEED_SUPER: |
|
break; |
|
default: |
|
dev_err(dummy_dev(dum_hcd), "Unsupported driver max speed %d\n", |
|
driver->max_speed); |
|
return -EINVAL; |
|
} |
|
|
|
/* |
|
* DEVICE side init ... the layer above hardware, which |
|
* can't enumerate without help from the driver we're binding. |
|
*/ |
|
|
|
spin_lock_irq(&dum->lock); |
|
dum->devstatus = 0; |
|
dum->driver = driver; |
|
dum->ints_enabled = 1; |
|
spin_unlock_irq(&dum->lock); |
|
|
|
return 0; |
|
} |
|
|
|
static int dummy_udc_stop(struct usb_gadget *g) |
|
{ |
|
struct dummy_hcd *dum_hcd = gadget_to_dummy_hcd(g); |
|
struct dummy *dum = dum_hcd->dum; |
|
|
|
spin_lock_irq(&dum->lock); |
|
dum->ints_enabled = 0; |
|
stop_activity(dum); |
|
dum->driver = NULL; |
|
spin_unlock_irq(&dum->lock); |
|
|
|
return 0; |
|
} |
|
|
|
#undef is_enabled |
|
|
|
/* The gadget structure is stored inside the hcd structure and will be |
|
* released along with it. */ |
|
static void init_dummy_udc_hw(struct dummy *dum) |
|
{ |
|
int i; |
|
|
|
INIT_LIST_HEAD(&dum->gadget.ep_list); |
|
for (i = 0; i < DUMMY_ENDPOINTS; i++) { |
|
struct dummy_ep *ep = &dum->ep[i]; |
|
|
|
if (!ep_info[i].name) |
|
break; |
|
ep->ep.name = ep_info[i].name; |
|
ep->ep.caps = ep_info[i].caps; |
|
ep->ep.ops = &dummy_ep_ops; |
|
list_add_tail(&ep->ep.ep_list, &dum->gadget.ep_list); |
|
ep->halted = ep->wedged = ep->already_seen = |
|
ep->setup_stage = 0; |
|
usb_ep_set_maxpacket_limit(&ep->ep, ~0); |
|
ep->ep.max_streams = 16; |
|
ep->last_io = jiffies; |
|
ep->gadget = &dum->gadget; |
|
ep->desc = NULL; |
|
INIT_LIST_HEAD(&ep->queue); |
|
} |
|
|
|
dum->gadget.ep0 = &dum->ep[0].ep; |
|
list_del_init(&dum->ep[0].ep.ep_list); |
|
INIT_LIST_HEAD(&dum->fifo_req.queue); |
|
|
|
#ifdef CONFIG_USB_OTG |
|
dum->gadget.is_otg = 1; |
|
#endif |
|
} |
|
|
|
static int dummy_udc_probe(struct platform_device *pdev) |
|
{ |
|
struct dummy *dum; |
|
int rc; |
|
|
|
dum = *((void **)dev_get_platdata(&pdev->dev)); |
|
/* Clear usb_gadget region for new registration to udc-core */ |
|
memzero_explicit(&dum->gadget, sizeof(struct usb_gadget)); |
|
dum->gadget.name = gadget_name; |
|
dum->gadget.ops = &dummy_ops; |
|
if (mod_data.is_super_speed) |
|
dum->gadget.max_speed = USB_SPEED_SUPER; |
|
else if (mod_data.is_high_speed) |
|
dum->gadget.max_speed = USB_SPEED_HIGH; |
|
else |
|
dum->gadget.max_speed = USB_SPEED_FULL; |
|
|
|
dum->gadget.dev.parent = &pdev->dev; |
|
init_dummy_udc_hw(dum); |
|
|
|
rc = usb_add_gadget_udc(&pdev->dev, &dum->gadget); |
|
if (rc < 0) |
|
goto err_udc; |
|
|
|
rc = device_create_file(&dum->gadget.dev, &dev_attr_function); |
|
if (rc < 0) |
|
goto err_dev; |
|
platform_set_drvdata(pdev, dum); |
|
return rc; |
|
|
|
err_dev: |
|
usb_del_gadget_udc(&dum->gadget); |
|
err_udc: |
|
return rc; |
|
} |
|
|
|
static int dummy_udc_remove(struct platform_device *pdev) |
|
{ |
|
struct dummy *dum = platform_get_drvdata(pdev); |
|
|
|
device_remove_file(&dum->gadget.dev, &dev_attr_function); |
|
usb_del_gadget_udc(&dum->gadget); |
|
return 0; |
|
} |
|
|
|
static void dummy_udc_pm(struct dummy *dum, struct dummy_hcd *dum_hcd, |
|
int suspend) |
|
{ |
|
spin_lock_irq(&dum->lock); |
|
dum->udc_suspended = suspend; |
|
set_link_state(dum_hcd); |
|
spin_unlock_irq(&dum->lock); |
|
} |
|
|
|
static int dummy_udc_suspend(struct platform_device *pdev, pm_message_t state) |
|
{ |
|
struct dummy *dum = platform_get_drvdata(pdev); |
|
struct dummy_hcd *dum_hcd = gadget_to_dummy_hcd(&dum->gadget); |
|
|
|
dev_dbg(&pdev->dev, "%s\n", __func__); |
|
dummy_udc_pm(dum, dum_hcd, 1); |
|
usb_hcd_poll_rh_status(dummy_hcd_to_hcd(dum_hcd)); |
|
return 0; |
|
} |
|
|
|
static int dummy_udc_resume(struct platform_device *pdev) |
|
{ |
|
struct dummy *dum = platform_get_drvdata(pdev); |
|
struct dummy_hcd *dum_hcd = gadget_to_dummy_hcd(&dum->gadget); |
|
|
|
dev_dbg(&pdev->dev, "%s\n", __func__); |
|
dummy_udc_pm(dum, dum_hcd, 0); |
|
usb_hcd_poll_rh_status(dummy_hcd_to_hcd(dum_hcd)); |
|
return 0; |
|
} |
|
|
|
static struct platform_driver dummy_udc_driver = { |
|
.probe = dummy_udc_probe, |
|
.remove = dummy_udc_remove, |
|
.suspend = dummy_udc_suspend, |
|
.resume = dummy_udc_resume, |
|
.driver = { |
|
.name = gadget_name, |
|
}, |
|
}; |
|
|
|
/*-------------------------------------------------------------------------*/ |
|
|
|
static unsigned int dummy_get_ep_idx(const struct usb_endpoint_descriptor *desc) |
|
{ |
|
unsigned int index; |
|
|
|
index = usb_endpoint_num(desc) << 1; |
|
if (usb_endpoint_dir_in(desc)) |
|
index |= 1; |
|
return index; |
|
} |
|
|
|
/* HOST SIDE DRIVER |
|
* |
|
* this uses the hcd framework to hook up to host side drivers. |
|
* its root hub will only have one device, otherwise it acts like |
|
* a normal host controller. |
|
* |
|
* when urbs are queued, they're just stuck on a list that we |
|
* scan in a timer callback. that callback connects writes from |
|
* the host with reads from the device, and so on, based on the |
|
* usb 2.0 rules. |
|
*/ |
|
|
|
static int dummy_ep_stream_en(struct dummy_hcd *dum_hcd, struct urb *urb) |
|
{ |
|
const struct usb_endpoint_descriptor *desc = &urb->ep->desc; |
|
u32 index; |
|
|
|
if (!usb_endpoint_xfer_bulk(desc)) |
|
return 0; |
|
|
|
index = dummy_get_ep_idx(desc); |
|
return (1 << index) & dum_hcd->stream_en_ep; |
|
} |
|
|
|
/* |
|
* The max stream number is saved as a nibble so for the 30 possible endpoints |
|
* we only 15 bytes of memory. Therefore we are limited to max 16 streams (0 |
|
* means we use only 1 stream). The maximum according to the spec is 16bit so |
|
* if the 16 stream limit is about to go, the array size should be incremented |
|
* to 30 elements of type u16. |
|
*/ |
|
static int get_max_streams_for_pipe(struct dummy_hcd *dum_hcd, |
|
unsigned int pipe) |
|
{ |
|
int max_streams; |
|
|
|
max_streams = dum_hcd->num_stream[usb_pipeendpoint(pipe)]; |
|
if (usb_pipeout(pipe)) |
|
max_streams >>= 4; |
|
else |
|
max_streams &= 0xf; |
|
max_streams++; |
|
return max_streams; |
|
} |
|
|
|
static void set_max_streams_for_pipe(struct dummy_hcd *dum_hcd, |
|
unsigned int pipe, unsigned int streams) |
|
{ |
|
int max_streams; |
|
|
|
streams--; |
|
max_streams = dum_hcd->num_stream[usb_pipeendpoint(pipe)]; |
|
if (usb_pipeout(pipe)) { |
|
streams <<= 4; |
|
max_streams &= 0xf; |
|
} else { |
|
max_streams &= 0xf0; |
|
} |
|
max_streams |= streams; |
|
dum_hcd->num_stream[usb_pipeendpoint(pipe)] = max_streams; |
|
} |
|
|
|
static int dummy_validate_stream(struct dummy_hcd *dum_hcd, struct urb *urb) |
|
{ |
|
unsigned int max_streams; |
|
int enabled; |
|
|
|
enabled = dummy_ep_stream_en(dum_hcd, urb); |
|
if (!urb->stream_id) { |
|
if (enabled) |
|
return -EINVAL; |
|
return 0; |
|
} |
|
if (!enabled) |
|
return -EINVAL; |
|
|
|
max_streams = get_max_streams_for_pipe(dum_hcd, |
|
usb_pipeendpoint(urb->pipe)); |
|
if (urb->stream_id > max_streams) { |
|
dev_err(dummy_dev(dum_hcd), "Stream id %d is out of range.\n", |
|
urb->stream_id); |
|
BUG(); |
|
return -EINVAL; |
|
} |
|
return 0; |
|
} |
|
|
|
static int dummy_urb_enqueue( |
|
struct usb_hcd *hcd, |
|
struct urb *urb, |
|
gfp_t mem_flags |
|
) { |
|
struct dummy_hcd *dum_hcd; |
|
struct urbp *urbp; |
|
unsigned long flags; |
|
int rc; |
|
|
|
urbp = kmalloc(sizeof *urbp, mem_flags); |
|
if (!urbp) |
|
return -ENOMEM; |
|
urbp->urb = urb; |
|
urbp->miter_started = 0; |
|
|
|
dum_hcd = hcd_to_dummy_hcd(hcd); |
|
spin_lock_irqsave(&dum_hcd->dum->lock, flags); |
|
|
|
rc = dummy_validate_stream(dum_hcd, urb); |
|
if (rc) { |
|
kfree(urbp); |
|
goto done; |
|
} |
|
|
|
rc = usb_hcd_link_urb_to_ep(hcd, urb); |
|
if (rc) { |
|
kfree(urbp); |
|
goto done; |
|
} |
|
|
|
if (!dum_hcd->udev) { |
|
dum_hcd->udev = urb->dev; |
|
usb_get_dev(dum_hcd->udev); |
|
} else if (unlikely(dum_hcd->udev != urb->dev)) |
|
dev_err(dummy_dev(dum_hcd), "usb_device address has changed!\n"); |
|
|
|
list_add_tail(&urbp->urbp_list, &dum_hcd->urbp_list); |
|
urb->hcpriv = urbp; |
|
if (!dum_hcd->next_frame_urbp) |
|
dum_hcd->next_frame_urbp = urbp; |
|
if (usb_pipetype(urb->pipe) == PIPE_CONTROL) |
|
urb->error_count = 1; /* mark as a new urb */ |
|
|
|
/* kick the scheduler, it'll do the rest */ |
|
if (!timer_pending(&dum_hcd->timer)) |
|
mod_timer(&dum_hcd->timer, jiffies + 1); |
|
|
|
done: |
|
spin_unlock_irqrestore(&dum_hcd->dum->lock, flags); |
|
return rc; |
|
} |
|
|
|
static int dummy_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status) |
|
{ |
|
struct dummy_hcd *dum_hcd; |
|
unsigned long flags; |
|
int rc; |
|
|
|
/* giveback happens automatically in timer callback, |
|
* so make sure the callback happens */ |
|
dum_hcd = hcd_to_dummy_hcd(hcd); |
|
spin_lock_irqsave(&dum_hcd->dum->lock, flags); |
|
|
|
rc = usb_hcd_check_unlink_urb(hcd, urb, status); |
|
if (!rc && dum_hcd->rh_state != DUMMY_RH_RUNNING && |
|
!list_empty(&dum_hcd->urbp_list)) |
|
mod_timer(&dum_hcd->timer, jiffies); |
|
|
|
spin_unlock_irqrestore(&dum_hcd->dum->lock, flags); |
|
return rc; |
|
} |
|
|
|
static int dummy_perform_transfer(struct urb *urb, struct dummy_request *req, |
|
u32 len) |
|
{ |
|
void *ubuf, *rbuf; |
|
struct urbp *urbp = urb->hcpriv; |
|
int to_host; |
|
struct sg_mapping_iter *miter = &urbp->miter; |
|
u32 trans = 0; |
|
u32 this_sg; |
|
bool next_sg; |
|
|
|
to_host = usb_urb_dir_in(urb); |
|
rbuf = req->req.buf + req->req.actual; |
|
|
|
if (!urb->num_sgs) { |
|
ubuf = urb->transfer_buffer + urb->actual_length; |
|
if (to_host) |
|
memcpy(ubuf, rbuf, len); |
|
else |
|
memcpy(rbuf, ubuf, len); |
|
return len; |
|
} |
|
|
|
if (!urbp->miter_started) { |
|
u32 flags = SG_MITER_ATOMIC; |
|
|
|
if (to_host) |
|
flags |= SG_MITER_TO_SG; |
|
else |
|
flags |= SG_MITER_FROM_SG; |
|
|
|
sg_miter_start(miter, urb->sg, urb->num_sgs, flags); |
|
urbp->miter_started = 1; |
|
} |
|
next_sg = sg_miter_next(miter); |
|
if (next_sg == false) { |
|
WARN_ON_ONCE(1); |
|
return -EINVAL; |
|
} |
|
do { |
|
ubuf = miter->addr; |
|
this_sg = min_t(u32, len, miter->length); |
|
miter->consumed = this_sg; |
|
trans += this_sg; |
|
|
|
if (to_host) |
|
memcpy(ubuf, rbuf, this_sg); |
|
else |
|
memcpy(rbuf, ubuf, this_sg); |
|
len -= this_sg; |
|
|
|
if (!len) |
|
break; |
|
next_sg = sg_miter_next(miter); |
|
if (next_sg == false) { |
|
WARN_ON_ONCE(1); |
|
return -EINVAL; |
|
} |
|
|
|
rbuf += this_sg; |
|
} while (1); |
|
|
|
sg_miter_stop(miter); |
|
return trans; |
|
} |
|
|
|
/* transfer up to a frame's worth; caller must own lock */ |
|
static int transfer(struct dummy_hcd *dum_hcd, struct urb *urb, |
|
struct dummy_ep *ep, int limit, int *status) |
|
{ |
|
struct dummy *dum = dum_hcd->dum; |
|
struct dummy_request *req; |
|
int sent = 0; |
|
|
|
top: |
|
/* if there's no request queued, the device is NAKing; return */ |
|
list_for_each_entry(req, &ep->queue, queue) { |
|
unsigned host_len, dev_len, len; |
|
int is_short, to_host; |
|
int rescan = 0; |
|
|
|
if (dummy_ep_stream_en(dum_hcd, urb)) { |
|
if ((urb->stream_id != req->req.stream_id)) |
|
continue; |
|
} |
|
|
|
/* 1..N packets of ep->ep.maxpacket each ... the last one |
|
* may be short (including zero length). |
|
* |
|
* writer can send a zlp explicitly (length 0) or implicitly |
|
* (length mod maxpacket zero, and 'zero' flag); they always |
|
* terminate reads. |
|
*/ |
|
host_len = urb->transfer_buffer_length - urb->actual_length; |
|
dev_len = req->req.length - req->req.actual; |
|
len = min(host_len, dev_len); |
|
|
|
/* FIXME update emulated data toggle too */ |
|
|
|
to_host = usb_urb_dir_in(urb); |
|
if (unlikely(len == 0)) |
|
is_short = 1; |
|
else { |
|
/* not enough bandwidth left? */ |
|
if (limit < ep->ep.maxpacket && limit < len) |
|
break; |
|
len = min_t(unsigned, len, limit); |
|
if (len == 0) |
|
break; |
|
|
|
/* send multiple of maxpacket first, then remainder */ |
|
if (len >= ep->ep.maxpacket) { |
|
is_short = 0; |
|
if (len % ep->ep.maxpacket) |
|
rescan = 1; |
|
len -= len % ep->ep.maxpacket; |
|
} else { |
|
is_short = 1; |
|
} |
|
|
|
len = dummy_perform_transfer(urb, req, len); |
|
|
|
ep->last_io = jiffies; |
|
if ((int)len < 0) { |
|
req->req.status = len; |
|
} else { |
|
limit -= len; |
|
sent += len; |
|
urb->actual_length += len; |
|
req->req.actual += len; |
|
} |
|
} |
|
|
|
/* short packets terminate, maybe with overflow/underflow. |
|
* it's only really an error to write too much. |
|
* |
|
* partially filling a buffer optionally blocks queue advances |
|
* (so completion handlers can clean up the queue) but we don't |
|
* need to emulate such data-in-flight. |
|
*/ |
|
if (is_short) { |
|
if (host_len == dev_len) { |
|
req->req.status = 0; |
|
*status = 0; |
|
} else if (to_host) { |
|
req->req.status = 0; |
|
if (dev_len > host_len) |
|
*status = -EOVERFLOW; |
|
else |
|
*status = 0; |
|
} else { |
|
*status = 0; |
|
if (host_len > dev_len) |
|
req->req.status = -EOVERFLOW; |
|
else |
|
req->req.status = 0; |
|
} |
|
|
|
/* |
|
* many requests terminate without a short packet. |
|
* send a zlp if demanded by flags. |
|
*/ |
|
} else { |
|
if (req->req.length == req->req.actual) { |
|
if (req->req.zero && to_host) |
|
rescan = 1; |
|
else |
|
req->req.status = 0; |
|
} |
|
if (urb->transfer_buffer_length == urb->actual_length) { |
|
if (urb->transfer_flags & URB_ZERO_PACKET && |
|
!to_host) |
|
rescan = 1; |
|
else |
|
*status = 0; |
|
} |
|
} |
|
|
|
/* device side completion --> continuable */ |
|
if (req->req.status != -EINPROGRESS) { |
|
list_del_init(&req->queue); |
|
|
|
spin_unlock(&dum->lock); |
|
usb_gadget_giveback_request(&ep->ep, &req->req); |
|
spin_lock(&dum->lock); |
|
|
|
/* requests might have been unlinked... */ |
|
rescan = 1; |
|
} |
|
|
|
/* host side completion --> terminate */ |
|
if (*status != -EINPROGRESS) |
|
break; |
|
|
|
/* rescan to continue with any other queued i/o */ |
|
if (rescan) |
|
goto top; |
|
} |
|
return sent; |
|
} |
|
|
|
static int periodic_bytes(struct dummy *dum, struct dummy_ep *ep) |
|
{ |
|
int limit = ep->ep.maxpacket; |
|
|
|
if (dum->gadget.speed == USB_SPEED_HIGH) { |
|
int tmp; |
|
|
|
/* high bandwidth mode */ |
|
tmp = usb_endpoint_maxp_mult(ep->desc); |
|
tmp *= 8 /* applies to entire frame */; |
|
limit += limit * tmp; |
|
} |
|
if (dum->gadget.speed == USB_SPEED_SUPER) { |
|
switch (usb_endpoint_type(ep->desc)) { |
|
case USB_ENDPOINT_XFER_ISOC: |
|
/* Sec. 4.4.8.2 USB3.0 Spec */ |
|
limit = 3 * 16 * 1024 * 8; |
|
break; |
|
case USB_ENDPOINT_XFER_INT: |
|
/* Sec. 4.4.7.2 USB3.0 Spec */ |
|
limit = 3 * 1024 * 8; |
|
break; |
|
case USB_ENDPOINT_XFER_BULK: |
|
default: |
|
break; |
|
} |
|
} |
|
return limit; |
|
} |
|
|
|
#define is_active(dum_hcd) ((dum_hcd->port_status & \ |
|
(USB_PORT_STAT_CONNECTION | USB_PORT_STAT_ENABLE | \ |
|
USB_PORT_STAT_SUSPEND)) \ |
|
== (USB_PORT_STAT_CONNECTION | USB_PORT_STAT_ENABLE)) |
|
|
|
static struct dummy_ep *find_endpoint(struct dummy *dum, u8 address) |
|
{ |
|
int i; |
|
|
|
if (!is_active((dum->gadget.speed == USB_SPEED_SUPER ? |
|
dum->ss_hcd : dum->hs_hcd))) |
|
return NULL; |
|
if (!dum->ints_enabled) |
|
return NULL; |
|
if ((address & ~USB_DIR_IN) == 0) |
|
return &dum->ep[0]; |
|
for (i = 1; i < DUMMY_ENDPOINTS; i++) { |
|
struct dummy_ep *ep = &dum->ep[i]; |
|
|
|
if (!ep->desc) |
|
continue; |
|
if (ep->desc->bEndpointAddress == address) |
|
return ep; |
|
} |
|
return NULL; |
|
} |
|
|
|
#undef is_active |
|
|
|
#define Dev_Request (USB_TYPE_STANDARD | USB_RECIP_DEVICE) |
|
#define Dev_InRequest (Dev_Request | USB_DIR_IN) |
|
#define Intf_Request (USB_TYPE_STANDARD | USB_RECIP_INTERFACE) |
|
#define Intf_InRequest (Intf_Request | USB_DIR_IN) |
|
#define Ep_Request (USB_TYPE_STANDARD | USB_RECIP_ENDPOINT) |
|
#define Ep_InRequest (Ep_Request | USB_DIR_IN) |
|
|
|
|
|
/** |
|
* handle_control_request() - handles all control transfers |
|
* @dum_hcd: pointer to dummy (the_controller) |
|
* @urb: the urb request to handle |
|
* @setup: pointer to the setup data for a USB device control |
|
* request |
|
* @status: pointer to request handling status |
|
* |
|
* Return 0 - if the request was handled |
|
* 1 - if the request wasn't handles |
|
* error code on error |
|
*/ |
|
static int handle_control_request(struct dummy_hcd *dum_hcd, struct urb *urb, |
|
struct usb_ctrlrequest *setup, |
|
int *status) |
|
{ |
|
struct dummy_ep *ep2; |
|
struct dummy *dum = dum_hcd->dum; |
|
int ret_val = 1; |
|
unsigned w_index; |
|
unsigned w_value; |
|
|
|
w_index = le16_to_cpu(setup->wIndex); |
|
w_value = le16_to_cpu(setup->wValue); |
|
switch (setup->bRequest) { |
|
case USB_REQ_SET_ADDRESS: |
|
if (setup->bRequestType != Dev_Request) |
|
break; |
|
dum->address = w_value; |
|
*status = 0; |
|
dev_dbg(udc_dev(dum), "set_address = %d\n", |
|
w_value); |
|
ret_val = 0; |
|
break; |
|
case USB_REQ_SET_FEATURE: |
|
if (setup->bRequestType == Dev_Request) { |
|
ret_val = 0; |
|
switch (w_value) { |
|
case USB_DEVICE_REMOTE_WAKEUP: |
|
break; |
|
case USB_DEVICE_B_HNP_ENABLE: |
|
dum->gadget.b_hnp_enable = 1; |
|
break; |
|
case USB_DEVICE_A_HNP_SUPPORT: |
|
dum->gadget.a_hnp_support = 1; |
|
break; |
|
case USB_DEVICE_A_ALT_HNP_SUPPORT: |
|
dum->gadget.a_alt_hnp_support = 1; |
|
break; |
|
case USB_DEVICE_U1_ENABLE: |
|
if (dummy_hcd_to_hcd(dum_hcd)->speed == |
|
HCD_USB3) |
|
w_value = USB_DEV_STAT_U1_ENABLED; |
|
else |
|
ret_val = -EOPNOTSUPP; |
|
break; |
|
case USB_DEVICE_U2_ENABLE: |
|
if (dummy_hcd_to_hcd(dum_hcd)->speed == |
|
HCD_USB3) |
|
w_value = USB_DEV_STAT_U2_ENABLED; |
|
else |
|
ret_val = -EOPNOTSUPP; |
|
break; |
|
case USB_DEVICE_LTM_ENABLE: |
|
if (dummy_hcd_to_hcd(dum_hcd)->speed == |
|
HCD_USB3) |
|
w_value = USB_DEV_STAT_LTM_ENABLED; |
|
else |
|
ret_val = -EOPNOTSUPP; |
|
break; |
|
default: |
|
ret_val = -EOPNOTSUPP; |
|
} |
|
if (ret_val == 0) { |
|
dum->devstatus |= (1 << w_value); |
|
*status = 0; |
|
} |
|
} else if (setup->bRequestType == Ep_Request) { |
|
/* endpoint halt */ |
|
ep2 = find_endpoint(dum, w_index); |
|
if (!ep2 || ep2->ep.name == ep0name) { |
|
ret_val = -EOPNOTSUPP; |
|
break; |
|
} |
|
ep2->halted = 1; |
|
ret_val = 0; |
|
*status = 0; |
|
} |
|
break; |
|
case USB_REQ_CLEAR_FEATURE: |
|
if (setup->bRequestType == Dev_Request) { |
|
ret_val = 0; |
|
switch (w_value) { |
|
case USB_DEVICE_REMOTE_WAKEUP: |
|
w_value = USB_DEVICE_REMOTE_WAKEUP; |
|
break; |
|
case USB_DEVICE_U1_ENABLE: |
|
if (dummy_hcd_to_hcd(dum_hcd)->speed == |
|
HCD_USB3) |
|
w_value = USB_DEV_STAT_U1_ENABLED; |
|
else |
|
ret_val = -EOPNOTSUPP; |
|
break; |
|
case USB_DEVICE_U2_ENABLE: |
|
if (dummy_hcd_to_hcd(dum_hcd)->speed == |
|
HCD_USB3) |
|
w_value = USB_DEV_STAT_U2_ENABLED; |
|
else |
|
ret_val = -EOPNOTSUPP; |
|
break; |
|
case USB_DEVICE_LTM_ENABLE: |
|
if (dummy_hcd_to_hcd(dum_hcd)->speed == |
|
HCD_USB3) |
|
w_value = USB_DEV_STAT_LTM_ENABLED; |
|
else |
|
ret_val = -EOPNOTSUPP; |
|
break; |
|
default: |
|
ret_val = -EOPNOTSUPP; |
|
break; |
|
} |
|
if (ret_val == 0) { |
|
dum->devstatus &= ~(1 << w_value); |
|
*status = 0; |
|
} |
|
} else if (setup->bRequestType == Ep_Request) { |
|
/* endpoint halt */ |
|
ep2 = find_endpoint(dum, w_index); |
|
if (!ep2) { |
|
ret_val = -EOPNOTSUPP; |
|
break; |
|
} |
|
if (!ep2->wedged) |
|
ep2->halted = 0; |
|
ret_val = 0; |
|
*status = 0; |
|
} |
|
break; |
|
case USB_REQ_GET_STATUS: |
|
if (setup->bRequestType == Dev_InRequest |
|
|| setup->bRequestType == Intf_InRequest |
|
|| setup->bRequestType == Ep_InRequest) { |
|
char *buf; |
|
/* |
|
* device: remote wakeup, selfpowered |
|
* interface: nothing |
|
* endpoint: halt |
|
*/ |
|
buf = (char *)urb->transfer_buffer; |
|
if (urb->transfer_buffer_length > 0) { |
|
if (setup->bRequestType == Ep_InRequest) { |
|
ep2 = find_endpoint(dum, w_index); |
|
if (!ep2) { |
|
ret_val = -EOPNOTSUPP; |
|
break; |
|
} |
|
buf[0] = ep2->halted; |
|
} else if (setup->bRequestType == |
|
Dev_InRequest) { |
|
buf[0] = (u8)dum->devstatus; |
|
} else |
|
buf[0] = 0; |
|
} |
|
if (urb->transfer_buffer_length > 1) |
|
buf[1] = 0; |
|
urb->actual_length = min_t(u32, 2, |
|
urb->transfer_buffer_length); |
|
ret_val = 0; |
|
*status = 0; |
|
} |
|
break; |
|
} |
|
return ret_val; |
|
} |
|
|
|
/* |
|
* Drive both sides of the transfers; looks like irq handlers to both |
|
* drivers except that the callbacks are invoked from soft interrupt |
|
* context. |
|
*/ |
|
static void dummy_timer(struct timer_list *t) |
|
{ |
|
struct dummy_hcd *dum_hcd = from_timer(dum_hcd, t, timer); |
|
struct dummy *dum = dum_hcd->dum; |
|
struct urbp *urbp, *tmp; |
|
unsigned long flags; |
|
int limit, total; |
|
int i; |
|
|
|
/* simplistic model for one frame's bandwidth */ |
|
/* FIXME: account for transaction and packet overhead */ |
|
switch (dum->gadget.speed) { |
|
case USB_SPEED_LOW: |
|
total = 8/*bytes*/ * 12/*packets*/; |
|
break; |
|
case USB_SPEED_FULL: |
|
total = 64/*bytes*/ * 19/*packets*/; |
|
break; |
|
case USB_SPEED_HIGH: |
|
total = 512/*bytes*/ * 13/*packets*/ * 8/*uframes*/; |
|
break; |
|
case USB_SPEED_SUPER: |
|
/* Bus speed is 500000 bytes/ms, so use a little less */ |
|
total = 490000; |
|
break; |
|
default: /* Can't happen */ |
|
dev_err(dummy_dev(dum_hcd), "bogus device speed\n"); |
|
total = 0; |
|
break; |
|
} |
|
|
|
/* FIXME if HZ != 1000 this will probably misbehave ... */ |
|
|
|
/* look at each urb queued by the host side driver */ |
|
spin_lock_irqsave(&dum->lock, flags); |
|
|
|
if (!dum_hcd->udev) { |
|
dev_err(dummy_dev(dum_hcd), |
|
"timer fired with no URBs pending?\n"); |
|
spin_unlock_irqrestore(&dum->lock, flags); |
|
return; |
|
} |
|
dum_hcd->next_frame_urbp = NULL; |
|
|
|
for (i = 0; i < DUMMY_ENDPOINTS; i++) { |
|
if (!ep_info[i].name) |
|
break; |
|
dum->ep[i].already_seen = 0; |
|
} |
|
|
|
restart: |
|
list_for_each_entry_safe(urbp, tmp, &dum_hcd->urbp_list, urbp_list) { |
|
struct urb *urb; |
|
struct dummy_request *req; |
|
u8 address; |
|
struct dummy_ep *ep = NULL; |
|
int status = -EINPROGRESS; |
|
|
|
/* stop when we reach URBs queued after the timer interrupt */ |
|
if (urbp == dum_hcd->next_frame_urbp) |
|
break; |
|
|
|
urb = urbp->urb; |
|
if (urb->unlinked) |
|
goto return_urb; |
|
else if (dum_hcd->rh_state != DUMMY_RH_RUNNING) |
|
continue; |
|
|
|
/* Used up this frame's bandwidth? */ |
|
if (total <= 0) |
|
continue; |
|
|
|
/* find the gadget's ep for this request (if configured) */ |
|
address = usb_pipeendpoint (urb->pipe); |
|
if (usb_urb_dir_in(urb)) |
|
address |= USB_DIR_IN; |
|
ep = find_endpoint(dum, address); |
|
if (!ep) { |
|
/* set_configuration() disagreement */ |
|
dev_dbg(dummy_dev(dum_hcd), |
|
"no ep configured for urb %p\n", |
|
urb); |
|
status = -EPROTO; |
|
goto return_urb; |
|
} |
|
|
|
if (ep->already_seen) |
|
continue; |
|
ep->already_seen = 1; |
|
if (ep == &dum->ep[0] && urb->error_count) { |
|
ep->setup_stage = 1; /* a new urb */ |
|
urb->error_count = 0; |
|
} |
|
if (ep->halted && !ep->setup_stage) { |
|
/* NOTE: must not be iso! */ |
|
dev_dbg(dummy_dev(dum_hcd), "ep %s halted, urb %p\n", |
|
ep->ep.name, urb); |
|
status = -EPIPE; |
|
goto return_urb; |
|
} |
|
/* FIXME make sure both ends agree on maxpacket */ |
|
|
|
/* handle control requests */ |
|
if (ep == &dum->ep[0] && ep->setup_stage) { |
|
struct usb_ctrlrequest setup; |
|
int value = 1; |
|
|
|
setup = *(struct usb_ctrlrequest *) urb->setup_packet; |
|
/* paranoia, in case of stale queued data */ |
|
list_for_each_entry(req, &ep->queue, queue) { |
|
list_del_init(&req->queue); |
|
req->req.status = -EOVERFLOW; |
|
dev_dbg(udc_dev(dum), "stale req = %p\n", |
|
req); |
|
|
|
spin_unlock(&dum->lock); |
|
usb_gadget_giveback_request(&ep->ep, &req->req); |
|
spin_lock(&dum->lock); |
|
ep->already_seen = 0; |
|
goto restart; |
|
} |
|
|
|
/* gadget driver never sees set_address or operations |
|
* on standard feature flags. some hardware doesn't |
|
* even expose them. |
|
*/ |
|
ep->last_io = jiffies; |
|
ep->setup_stage = 0; |
|
ep->halted = 0; |
|
|
|
value = handle_control_request(dum_hcd, urb, &setup, |
|
&status); |
|
|
|
/* gadget driver handles all other requests. block |
|
* until setup() returns; no reentrancy issues etc. |
|
*/ |
|
if (value > 0) { |
|
++dum->callback_usage; |
|
spin_unlock(&dum->lock); |
|
value = dum->driver->setup(&dum->gadget, |
|
&setup); |
|
spin_lock(&dum->lock); |
|
--dum->callback_usage; |
|
|
|
if (value >= 0) { |
|
/* no delays (max 64KB data stage) */ |
|
limit = 64*1024; |
|
goto treat_control_like_bulk; |
|
} |
|
/* error, see below */ |
|
} |
|
|
|
if (value < 0) { |
|
if (value != -EOPNOTSUPP) |
|
dev_dbg(udc_dev(dum), |
|
"setup --> %d\n", |
|
value); |
|
status = -EPIPE; |
|
urb->actual_length = 0; |
|
} |
|
|
|
goto return_urb; |
|
} |
|
|
|
/* non-control requests */ |
|
limit = total; |
|
switch (usb_pipetype(urb->pipe)) { |
|
case PIPE_ISOCHRONOUS: |
|
/* |
|
* We don't support isochronous. But if we did, |
|
* here are some of the issues we'd have to face: |
|
* |
|
* Is it urb->interval since the last xfer? |
|
* Use urb->iso_frame_desc[i]. |
|
* Complete whether or not ep has requests queued. |
|
* Report random errors, to debug drivers. |
|
*/ |
|
limit = max(limit, periodic_bytes(dum, ep)); |
|
status = -EINVAL; /* fail all xfers */ |
|
break; |
|
|
|
case PIPE_INTERRUPT: |
|
/* FIXME is it urb->interval since the last xfer? |
|
* this almost certainly polls too fast. |
|
*/ |
|
limit = max(limit, periodic_bytes(dum, ep)); |
|
fallthrough; |
|
|
|
default: |
|
treat_control_like_bulk: |
|
ep->last_io = jiffies; |
|
total -= transfer(dum_hcd, urb, ep, limit, &status); |
|
break; |
|
} |
|
|
|
/* incomplete transfer? */ |
|
if (status == -EINPROGRESS) |
|
continue; |
|
|
|
return_urb: |
|
list_del(&urbp->urbp_list); |
|
kfree(urbp); |
|
if (ep) |
|
ep->already_seen = ep->setup_stage = 0; |
|
|
|
usb_hcd_unlink_urb_from_ep(dummy_hcd_to_hcd(dum_hcd), urb); |
|
spin_unlock(&dum->lock); |
|
usb_hcd_giveback_urb(dummy_hcd_to_hcd(dum_hcd), urb, status); |
|
spin_lock(&dum->lock); |
|
|
|
goto restart; |
|
} |
|
|
|
if (list_empty(&dum_hcd->urbp_list)) { |
|
usb_put_dev(dum_hcd->udev); |
|
dum_hcd->udev = NULL; |
|
} else if (dum_hcd->rh_state == DUMMY_RH_RUNNING) { |
|
/* want a 1 msec delay here */ |
|
mod_timer(&dum_hcd->timer, jiffies + msecs_to_jiffies(1)); |
|
} |
|
|
|
spin_unlock_irqrestore(&dum->lock, flags); |
|
} |
|
|
|
/*-------------------------------------------------------------------------*/ |
|
|
|
#define PORT_C_MASK \ |
|
((USB_PORT_STAT_C_CONNECTION \ |
|
| USB_PORT_STAT_C_ENABLE \ |
|
| USB_PORT_STAT_C_SUSPEND \ |
|
| USB_PORT_STAT_C_OVERCURRENT \ |
|
| USB_PORT_STAT_C_RESET) << 16) |
|
|
|
static int dummy_hub_status(struct usb_hcd *hcd, char *buf) |
|
{ |
|
struct dummy_hcd *dum_hcd; |
|
unsigned long flags; |
|
int retval = 0; |
|
|
|
dum_hcd = hcd_to_dummy_hcd(hcd); |
|
|
|
spin_lock_irqsave(&dum_hcd->dum->lock, flags); |
|
if (!HCD_HW_ACCESSIBLE(hcd)) |
|
goto done; |
|
|
|
if (dum_hcd->resuming && time_after_eq(jiffies, dum_hcd->re_timeout)) { |
|
dum_hcd->port_status |= (USB_PORT_STAT_C_SUSPEND << 16); |
|
dum_hcd->port_status &= ~USB_PORT_STAT_SUSPEND; |
|
set_link_state(dum_hcd); |
|
} |
|
|
|
if ((dum_hcd->port_status & PORT_C_MASK) != 0) { |
|
*buf = (1 << 1); |
|
dev_dbg(dummy_dev(dum_hcd), "port status 0x%08x has changes\n", |
|
dum_hcd->port_status); |
|
retval = 1; |
|
if (dum_hcd->rh_state == DUMMY_RH_SUSPENDED) |
|
usb_hcd_resume_root_hub(hcd); |
|
} |
|
done: |
|
spin_unlock_irqrestore(&dum_hcd->dum->lock, flags); |
|
return retval; |
|
} |
|
|
|
/* usb 3.0 root hub device descriptor */ |
|
static struct { |
|
struct usb_bos_descriptor bos; |
|
struct usb_ss_cap_descriptor ss_cap; |
|
} __packed usb3_bos_desc = { |
|
|
|
.bos = { |
|
.bLength = USB_DT_BOS_SIZE, |
|
.bDescriptorType = USB_DT_BOS, |
|
.wTotalLength = cpu_to_le16(sizeof(usb3_bos_desc)), |
|
.bNumDeviceCaps = 1, |
|
}, |
|
.ss_cap = { |
|
.bLength = USB_DT_USB_SS_CAP_SIZE, |
|
.bDescriptorType = USB_DT_DEVICE_CAPABILITY, |
|
.bDevCapabilityType = USB_SS_CAP_TYPE, |
|
.wSpeedSupported = cpu_to_le16(USB_5GBPS_OPERATION), |
|
.bFunctionalitySupport = ilog2(USB_5GBPS_OPERATION), |
|
}, |
|
}; |
|
|
|
static inline void |
|
ss_hub_descriptor(struct usb_hub_descriptor *desc) |
|
{ |
|
memset(desc, 0, sizeof *desc); |
|
desc->bDescriptorType = USB_DT_SS_HUB; |
|
desc->bDescLength = 12; |
|
desc->wHubCharacteristics = cpu_to_le16( |
|
HUB_CHAR_INDV_PORT_LPSM | |
|
HUB_CHAR_COMMON_OCPM); |
|
desc->bNbrPorts = 1; |
|
desc->u.ss.bHubHdrDecLat = 0x04; /* Worst case: 0.4 micro sec*/ |
|
desc->u.ss.DeviceRemovable = 0; |
|
} |
|
|
|
static inline void hub_descriptor(struct usb_hub_descriptor *desc) |
|
{ |
|
memset(desc, 0, sizeof *desc); |
|
desc->bDescriptorType = USB_DT_HUB; |
|
desc->bDescLength = 9; |
|
desc->wHubCharacteristics = cpu_to_le16( |
|
HUB_CHAR_INDV_PORT_LPSM | |
|
HUB_CHAR_COMMON_OCPM); |
|
desc->bNbrPorts = 1; |
|
desc->u.hs.DeviceRemovable[0] = 0; |
|
desc->u.hs.DeviceRemovable[1] = 0xff; /* PortPwrCtrlMask */ |
|
} |
|
|
|
static int dummy_hub_control( |
|
struct usb_hcd *hcd, |
|
u16 typeReq, |
|
u16 wValue, |
|
u16 wIndex, |
|
char *buf, |
|
u16 wLength |
|
) { |
|
struct dummy_hcd *dum_hcd; |
|
int retval = 0; |
|
unsigned long flags; |
|
|
|
if (!HCD_HW_ACCESSIBLE(hcd)) |
|
return -ETIMEDOUT; |
|
|
|
dum_hcd = hcd_to_dummy_hcd(hcd); |
|
|
|
spin_lock_irqsave(&dum_hcd->dum->lock, flags); |
|
switch (typeReq) { |
|
case ClearHubFeature: |
|
break; |
|
case ClearPortFeature: |
|
switch (wValue) { |
|
case USB_PORT_FEAT_SUSPEND: |
|
if (hcd->speed == HCD_USB3) { |
|
dev_dbg(dummy_dev(dum_hcd), |
|
"USB_PORT_FEAT_SUSPEND req not " |
|
"supported for USB 3.0 roothub\n"); |
|
goto error; |
|
} |
|
if (dum_hcd->port_status & USB_PORT_STAT_SUSPEND) { |
|
/* 20msec resume signaling */ |
|
dum_hcd->resuming = 1; |
|
dum_hcd->re_timeout = jiffies + |
|
msecs_to_jiffies(20); |
|
} |
|
break; |
|
case USB_PORT_FEAT_POWER: |
|
dev_dbg(dummy_dev(dum_hcd), "power-off\n"); |
|
if (hcd->speed == HCD_USB3) |
|
dum_hcd->port_status &= ~USB_SS_PORT_STAT_POWER; |
|
else |
|
dum_hcd->port_status &= ~USB_PORT_STAT_POWER; |
|
set_link_state(dum_hcd); |
|
break; |
|
case USB_PORT_FEAT_ENABLE: |
|
case USB_PORT_FEAT_C_ENABLE: |
|
case USB_PORT_FEAT_C_SUSPEND: |
|
/* Not allowed for USB-3 */ |
|
if (hcd->speed == HCD_USB3) |
|
goto error; |
|
fallthrough; |
|
case USB_PORT_FEAT_C_CONNECTION: |
|
case USB_PORT_FEAT_C_RESET: |
|
dum_hcd->port_status &= ~(1 << wValue); |
|
set_link_state(dum_hcd); |
|
break; |
|
default: |
|
/* Disallow INDICATOR and C_OVER_CURRENT */ |
|
goto error; |
|
} |
|
break; |
|
case GetHubDescriptor: |
|
if (hcd->speed == HCD_USB3 && |
|
(wLength < USB_DT_SS_HUB_SIZE || |
|
wValue != (USB_DT_SS_HUB << 8))) { |
|
dev_dbg(dummy_dev(dum_hcd), |
|
"Wrong hub descriptor type for " |
|
"USB 3.0 roothub.\n"); |
|
goto error; |
|
} |
|
if (hcd->speed == HCD_USB3) |
|
ss_hub_descriptor((struct usb_hub_descriptor *) buf); |
|
else |
|
hub_descriptor((struct usb_hub_descriptor *) buf); |
|
break; |
|
|
|
case DeviceRequest | USB_REQ_GET_DESCRIPTOR: |
|
if (hcd->speed != HCD_USB3) |
|
goto error; |
|
|
|
if ((wValue >> 8) != USB_DT_BOS) |
|
goto error; |
|
|
|
memcpy(buf, &usb3_bos_desc, sizeof(usb3_bos_desc)); |
|
retval = sizeof(usb3_bos_desc); |
|
break; |
|
|
|
case GetHubStatus: |
|
*(__le32 *) buf = cpu_to_le32(0); |
|
break; |
|
case GetPortStatus: |
|
if (wIndex != 1) |
|
retval = -EPIPE; |
|
|
|
/* whoever resets or resumes must GetPortStatus to |
|
* complete it!! |
|
*/ |
|
if (dum_hcd->resuming && |
|
time_after_eq(jiffies, dum_hcd->re_timeout)) { |
|
dum_hcd->port_status |= (USB_PORT_STAT_C_SUSPEND << 16); |
|
dum_hcd->port_status &= ~USB_PORT_STAT_SUSPEND; |
|
} |
|
if ((dum_hcd->port_status & USB_PORT_STAT_RESET) != 0 && |
|
time_after_eq(jiffies, dum_hcd->re_timeout)) { |
|
dum_hcd->port_status |= (USB_PORT_STAT_C_RESET << 16); |
|
dum_hcd->port_status &= ~USB_PORT_STAT_RESET; |
|
if (dum_hcd->dum->pullup) { |
|
dum_hcd->port_status |= USB_PORT_STAT_ENABLE; |
|
|
|
if (hcd->speed < HCD_USB3) { |
|
switch (dum_hcd->dum->gadget.speed) { |
|
case USB_SPEED_HIGH: |
|
dum_hcd->port_status |= |
|
USB_PORT_STAT_HIGH_SPEED; |
|
break; |
|
case USB_SPEED_LOW: |
|
dum_hcd->dum->gadget.ep0-> |
|
maxpacket = 8; |
|
dum_hcd->port_status |= |
|
USB_PORT_STAT_LOW_SPEED; |
|
break; |
|
default: |
|
break; |
|
} |
|
} |
|
} |
|
} |
|
set_link_state(dum_hcd); |
|
((__le16 *) buf)[0] = cpu_to_le16(dum_hcd->port_status); |
|
((__le16 *) buf)[1] = cpu_to_le16(dum_hcd->port_status >> 16); |
|
break; |
|
case SetHubFeature: |
|
retval = -EPIPE; |
|
break; |
|
case SetPortFeature: |
|
switch (wValue) { |
|
case USB_PORT_FEAT_LINK_STATE: |
|
if (hcd->speed != HCD_USB3) { |
|
dev_dbg(dummy_dev(dum_hcd), |
|
"USB_PORT_FEAT_LINK_STATE req not " |
|
"supported for USB 2.0 roothub\n"); |
|
goto error; |
|
} |
|
/* |
|
* Since this is dummy we don't have an actual link so |
|
* there is nothing to do for the SET_LINK_STATE cmd |
|
*/ |
|
break; |
|
case USB_PORT_FEAT_U1_TIMEOUT: |
|
case USB_PORT_FEAT_U2_TIMEOUT: |
|
/* TODO: add suspend/resume support! */ |
|
if (hcd->speed != HCD_USB3) { |
|
dev_dbg(dummy_dev(dum_hcd), |
|
"USB_PORT_FEAT_U1/2_TIMEOUT req not " |
|
"supported for USB 2.0 roothub\n"); |
|
goto error; |
|
} |
|
break; |
|
case USB_PORT_FEAT_SUSPEND: |
|
/* Applicable only for USB2.0 hub */ |
|
if (hcd->speed == HCD_USB3) { |
|
dev_dbg(dummy_dev(dum_hcd), |
|
"USB_PORT_FEAT_SUSPEND req not " |
|
"supported for USB 3.0 roothub\n"); |
|
goto error; |
|
} |
|
if (dum_hcd->active) { |
|
dum_hcd->port_status |= USB_PORT_STAT_SUSPEND; |
|
|
|
/* HNP would happen here; for now we |
|
* assume b_bus_req is always true. |
|
*/ |
|
set_link_state(dum_hcd); |
|
if (((1 << USB_DEVICE_B_HNP_ENABLE) |
|
& dum_hcd->dum->devstatus) != 0) |
|
dev_dbg(dummy_dev(dum_hcd), |
|
"no HNP yet!\n"); |
|
} |
|
break; |
|
case USB_PORT_FEAT_POWER: |
|
if (hcd->speed == HCD_USB3) |
|
dum_hcd->port_status |= USB_SS_PORT_STAT_POWER; |
|
else |
|
dum_hcd->port_status |= USB_PORT_STAT_POWER; |
|
set_link_state(dum_hcd); |
|
break; |
|
case USB_PORT_FEAT_BH_PORT_RESET: |
|
/* Applicable only for USB3.0 hub */ |
|
if (hcd->speed != HCD_USB3) { |
|
dev_dbg(dummy_dev(dum_hcd), |
|
"USB_PORT_FEAT_BH_PORT_RESET req not " |
|
"supported for USB 2.0 roothub\n"); |
|
goto error; |
|
} |
|
fallthrough; |
|
case USB_PORT_FEAT_RESET: |
|
if (!(dum_hcd->port_status & USB_PORT_STAT_CONNECTION)) |
|
break; |
|
/* if it's already enabled, disable */ |
|
if (hcd->speed == HCD_USB3) { |
|
dum_hcd->port_status = |
|
(USB_SS_PORT_STAT_POWER | |
|
USB_PORT_STAT_CONNECTION | |
|
USB_PORT_STAT_RESET); |
|
} else { |
|
dum_hcd->port_status &= ~(USB_PORT_STAT_ENABLE |
|
| USB_PORT_STAT_LOW_SPEED |
|
| USB_PORT_STAT_HIGH_SPEED); |
|
dum_hcd->port_status |= USB_PORT_STAT_RESET; |
|
} |
|
/* |
|
* We want to reset device status. All but the |
|
* Self powered feature |
|
*/ |
|
dum_hcd->dum->devstatus &= |
|
(1 << USB_DEVICE_SELF_POWERED); |
|
/* |
|
* FIXME USB3.0: what is the correct reset signaling |
|
* interval? Is it still 50msec as for HS? |
|
*/ |
|
dum_hcd->re_timeout = jiffies + msecs_to_jiffies(50); |
|
set_link_state(dum_hcd); |
|
break; |
|
case USB_PORT_FEAT_C_CONNECTION: |
|
case USB_PORT_FEAT_C_RESET: |
|
case USB_PORT_FEAT_C_ENABLE: |
|
case USB_PORT_FEAT_C_SUSPEND: |
|
/* Not allowed for USB-3, and ignored for USB-2 */ |
|
if (hcd->speed == HCD_USB3) |
|
goto error; |
|
break; |
|
default: |
|
/* Disallow TEST, INDICATOR, and C_OVER_CURRENT */ |
|
goto error; |
|
} |
|
break; |
|
case GetPortErrorCount: |
|
if (hcd->speed != HCD_USB3) { |
|
dev_dbg(dummy_dev(dum_hcd), |
|
"GetPortErrorCount req not " |
|
"supported for USB 2.0 roothub\n"); |
|
goto error; |
|
} |
|
/* We'll always return 0 since this is a dummy hub */ |
|
*(__le32 *) buf = cpu_to_le32(0); |
|
break; |
|
case SetHubDepth: |
|
if (hcd->speed != HCD_USB3) { |
|
dev_dbg(dummy_dev(dum_hcd), |
|
"SetHubDepth req not supported for " |
|
"USB 2.0 roothub\n"); |
|
goto error; |
|
} |
|
break; |
|
default: |
|
dev_dbg(dummy_dev(dum_hcd), |
|
"hub control req%04x v%04x i%04x l%d\n", |
|
typeReq, wValue, wIndex, wLength); |
|
error: |
|
/* "protocol stall" on error */ |
|
retval = -EPIPE; |
|
} |
|
spin_unlock_irqrestore(&dum_hcd->dum->lock, flags); |
|
|
|
if ((dum_hcd->port_status & PORT_C_MASK) != 0) |
|
usb_hcd_poll_rh_status(hcd); |
|
return retval; |
|
} |
|
|
|
static int dummy_bus_suspend(struct usb_hcd *hcd) |
|
{ |
|
struct dummy_hcd *dum_hcd = hcd_to_dummy_hcd(hcd); |
|
|
|
dev_dbg(&hcd->self.root_hub->dev, "%s\n", __func__); |
|
|
|
spin_lock_irq(&dum_hcd->dum->lock); |
|
dum_hcd->rh_state = DUMMY_RH_SUSPENDED; |
|
set_link_state(dum_hcd); |
|
hcd->state = HC_STATE_SUSPENDED; |
|
spin_unlock_irq(&dum_hcd->dum->lock); |
|
return 0; |
|
} |
|
|
|
static int dummy_bus_resume(struct usb_hcd *hcd) |
|
{ |
|
struct dummy_hcd *dum_hcd = hcd_to_dummy_hcd(hcd); |
|
int rc = 0; |
|
|
|
dev_dbg(&hcd->self.root_hub->dev, "%s\n", __func__); |
|
|
|
spin_lock_irq(&dum_hcd->dum->lock); |
|
if (!HCD_HW_ACCESSIBLE(hcd)) { |
|
rc = -ESHUTDOWN; |
|
} else { |
|
dum_hcd->rh_state = DUMMY_RH_RUNNING; |
|
set_link_state(dum_hcd); |
|
if (!list_empty(&dum_hcd->urbp_list)) |
|
mod_timer(&dum_hcd->timer, jiffies); |
|
hcd->state = HC_STATE_RUNNING; |
|
} |
|
spin_unlock_irq(&dum_hcd->dum->lock); |
|
return rc; |
|
} |
|
|
|
/*-------------------------------------------------------------------------*/ |
|
|
|
static inline ssize_t show_urb(char *buf, size_t size, struct urb *urb) |
|
{ |
|
int ep = usb_pipeendpoint(urb->pipe); |
|
|
|
return scnprintf(buf, size, |
|
"urb/%p %s ep%d%s%s len %d/%d\n", |
|
urb, |
|
({ char *s; |
|
switch (urb->dev->speed) { |
|
case USB_SPEED_LOW: |
|
s = "ls"; |
|
break; |
|
case USB_SPEED_FULL: |
|
s = "fs"; |
|
break; |
|
case USB_SPEED_HIGH: |
|
s = "hs"; |
|
break; |
|
case USB_SPEED_SUPER: |
|
s = "ss"; |
|
break; |
|
default: |
|
s = "?"; |
|
break; |
|
} s; }), |
|
ep, ep ? (usb_urb_dir_in(urb) ? "in" : "out") : "", |
|
({ char *s; \ |
|
switch (usb_pipetype(urb->pipe)) { \ |
|
case PIPE_CONTROL: \ |
|
s = ""; \ |
|
break; \ |
|
case PIPE_BULK: \ |
|
s = "-bulk"; \ |
|
break; \ |
|
case PIPE_INTERRUPT: \ |
|
s = "-int"; \ |
|
break; \ |
|
default: \ |
|
s = "-iso"; \ |
|
break; \ |
|
} s; }), |
|
urb->actual_length, urb->transfer_buffer_length); |
|
} |
|
|
|
static ssize_t urbs_show(struct device *dev, struct device_attribute *attr, |
|
char *buf) |
|
{ |
|
struct usb_hcd *hcd = dev_get_drvdata(dev); |
|
struct dummy_hcd *dum_hcd = hcd_to_dummy_hcd(hcd); |
|
struct urbp *urbp; |
|
size_t size = 0; |
|
unsigned long flags; |
|
|
|
spin_lock_irqsave(&dum_hcd->dum->lock, flags); |
|
list_for_each_entry(urbp, &dum_hcd->urbp_list, urbp_list) { |
|
size_t temp; |
|
|
|
temp = show_urb(buf, PAGE_SIZE - size, urbp->urb); |
|
buf += temp; |
|
size += temp; |
|
} |
|
spin_unlock_irqrestore(&dum_hcd->dum->lock, flags); |
|
|
|
return size; |
|
} |
|
static DEVICE_ATTR_RO(urbs); |
|
|
|
static int dummy_start_ss(struct dummy_hcd *dum_hcd) |
|
{ |
|
timer_setup(&dum_hcd->timer, dummy_timer, 0); |
|
dum_hcd->rh_state = DUMMY_RH_RUNNING; |
|
dum_hcd->stream_en_ep = 0; |
|
INIT_LIST_HEAD(&dum_hcd->urbp_list); |
|
dummy_hcd_to_hcd(dum_hcd)->power_budget = POWER_BUDGET_3; |
|
dummy_hcd_to_hcd(dum_hcd)->state = HC_STATE_RUNNING; |
|
dummy_hcd_to_hcd(dum_hcd)->uses_new_polling = 1; |
|
#ifdef CONFIG_USB_OTG |
|
dummy_hcd_to_hcd(dum_hcd)->self.otg_port = 1; |
|
#endif |
|
return 0; |
|
|
|
/* FIXME 'urbs' should be a per-device thing, maybe in usbcore */ |
|
return device_create_file(dummy_dev(dum_hcd), &dev_attr_urbs); |
|
} |
|
|
|
static int dummy_start(struct usb_hcd *hcd) |
|
{ |
|
struct dummy_hcd *dum_hcd = hcd_to_dummy_hcd(hcd); |
|
|
|
/* |
|
* HOST side init ... we emulate a root hub that'll only ever |
|
* talk to one device (the gadget side). Also appears in sysfs, |
|
* just like more familiar pci-based HCDs. |
|
*/ |
|
if (!usb_hcd_is_primary_hcd(hcd)) |
|
return dummy_start_ss(dum_hcd); |
|
|
|
spin_lock_init(&dum_hcd->dum->lock); |
|
timer_setup(&dum_hcd->timer, dummy_timer, 0); |
|
dum_hcd->rh_state = DUMMY_RH_RUNNING; |
|
|
|
INIT_LIST_HEAD(&dum_hcd->urbp_list); |
|
|
|
hcd->power_budget = POWER_BUDGET; |
|
hcd->state = HC_STATE_RUNNING; |
|
hcd->uses_new_polling = 1; |
|
|
|
#ifdef CONFIG_USB_OTG |
|
hcd->self.otg_port = 1; |
|
#endif |
|
|
|
/* FIXME 'urbs' should be a per-device thing, maybe in usbcore */ |
|
return device_create_file(dummy_dev(dum_hcd), &dev_attr_urbs); |
|
} |
|
|
|
static void dummy_stop(struct usb_hcd *hcd) |
|
{ |
|
device_remove_file(dummy_dev(hcd_to_dummy_hcd(hcd)), &dev_attr_urbs); |
|
dev_info(dummy_dev(hcd_to_dummy_hcd(hcd)), "stopped\n"); |
|
} |
|
|
|
/*-------------------------------------------------------------------------*/ |
|
|
|
static int dummy_h_get_frame(struct usb_hcd *hcd) |
|
{ |
|
return dummy_g_get_frame(NULL); |
|
} |
|
|
|
static int dummy_setup(struct usb_hcd *hcd) |
|
{ |
|
struct dummy *dum; |
|
|
|
dum = *((void **)dev_get_platdata(hcd->self.controller)); |
|
hcd->self.sg_tablesize = ~0; |
|
if (usb_hcd_is_primary_hcd(hcd)) { |
|
dum->hs_hcd = hcd_to_dummy_hcd(hcd); |
|
dum->hs_hcd->dum = dum; |
|
/* |
|
* Mark the first roothub as being USB 2.0. |
|
* The USB 3.0 roothub will be registered later by |
|
* dummy_hcd_probe() |
|
*/ |
|
hcd->speed = HCD_USB2; |
|
hcd->self.root_hub->speed = USB_SPEED_HIGH; |
|
} else { |
|
dum->ss_hcd = hcd_to_dummy_hcd(hcd); |
|
dum->ss_hcd->dum = dum; |
|
hcd->speed = HCD_USB3; |
|
hcd->self.root_hub->speed = USB_SPEED_SUPER; |
|
} |
|
return 0; |
|
} |
|
|
|
/* Change a group of bulk endpoints to support multiple stream IDs */ |
|
static int dummy_alloc_streams(struct usb_hcd *hcd, struct usb_device *udev, |
|
struct usb_host_endpoint **eps, unsigned int num_eps, |
|
unsigned int num_streams, gfp_t mem_flags) |
|
{ |
|
struct dummy_hcd *dum_hcd = hcd_to_dummy_hcd(hcd); |
|
unsigned long flags; |
|
int max_stream; |
|
int ret_streams = num_streams; |
|
unsigned int index; |
|
unsigned int i; |
|
|
|
if (!num_eps) |
|
return -EINVAL; |
|
|
|
spin_lock_irqsave(&dum_hcd->dum->lock, flags); |
|
for (i = 0; i < num_eps; i++) { |
|
index = dummy_get_ep_idx(&eps[i]->desc); |
|
if ((1 << index) & dum_hcd->stream_en_ep) { |
|
ret_streams = -EINVAL; |
|
goto out; |
|
} |
|
max_stream = usb_ss_max_streams(&eps[i]->ss_ep_comp); |
|
if (!max_stream) { |
|
ret_streams = -EINVAL; |
|
goto out; |
|
} |
|
if (max_stream < ret_streams) { |
|
dev_dbg(dummy_dev(dum_hcd), "Ep 0x%x only supports %u " |
|
"stream IDs.\n", |
|
eps[i]->desc.bEndpointAddress, |
|
max_stream); |
|
ret_streams = max_stream; |
|
} |
|
} |
|
|
|
for (i = 0; i < num_eps; i++) { |
|
index = dummy_get_ep_idx(&eps[i]->desc); |
|
dum_hcd->stream_en_ep |= 1 << index; |
|
set_max_streams_for_pipe(dum_hcd, |
|
usb_endpoint_num(&eps[i]->desc), ret_streams); |
|
} |
|
out: |
|
spin_unlock_irqrestore(&dum_hcd->dum->lock, flags); |
|
return ret_streams; |
|
} |
|
|
|
/* Reverts a group of bulk endpoints back to not using stream IDs. */ |
|
static int dummy_free_streams(struct usb_hcd *hcd, struct usb_device *udev, |
|
struct usb_host_endpoint **eps, unsigned int num_eps, |
|
gfp_t mem_flags) |
|
{ |
|
struct dummy_hcd *dum_hcd = hcd_to_dummy_hcd(hcd); |
|
unsigned long flags; |
|
int ret; |
|
unsigned int index; |
|
unsigned int i; |
|
|
|
spin_lock_irqsave(&dum_hcd->dum->lock, flags); |
|
for (i = 0; i < num_eps; i++) { |
|
index = dummy_get_ep_idx(&eps[i]->desc); |
|
if (!((1 << index) & dum_hcd->stream_en_ep)) { |
|
ret = -EINVAL; |
|
goto out; |
|
} |
|
} |
|
|
|
for (i = 0; i < num_eps; i++) { |
|
index = dummy_get_ep_idx(&eps[i]->desc); |
|
dum_hcd->stream_en_ep &= ~(1 << index); |
|
set_max_streams_for_pipe(dum_hcd, |
|
usb_endpoint_num(&eps[i]->desc), 0); |
|
} |
|
ret = 0; |
|
out: |
|
spin_unlock_irqrestore(&dum_hcd->dum->lock, flags); |
|
return ret; |
|
} |
|
|
|
static struct hc_driver dummy_hcd = { |
|
.description = (char *) driver_name, |
|
.product_desc = "Dummy host controller", |
|
.hcd_priv_size = sizeof(struct dummy_hcd), |
|
|
|
.reset = dummy_setup, |
|
.start = dummy_start, |
|
.stop = dummy_stop, |
|
|
|
.urb_enqueue = dummy_urb_enqueue, |
|
.urb_dequeue = dummy_urb_dequeue, |
|
|
|
.get_frame_number = dummy_h_get_frame, |
|
|
|
.hub_status_data = dummy_hub_status, |
|
.hub_control = dummy_hub_control, |
|
.bus_suspend = dummy_bus_suspend, |
|
.bus_resume = dummy_bus_resume, |
|
|
|
.alloc_streams = dummy_alloc_streams, |
|
.free_streams = dummy_free_streams, |
|
}; |
|
|
|
static int dummy_hcd_probe(struct platform_device *pdev) |
|
{ |
|
struct dummy *dum; |
|
struct usb_hcd *hs_hcd; |
|
struct usb_hcd *ss_hcd; |
|
int retval; |
|
|
|
dev_info(&pdev->dev, "%s, driver " DRIVER_VERSION "\n", driver_desc); |
|
dum = *((void **)dev_get_platdata(&pdev->dev)); |
|
|
|
if (mod_data.is_super_speed) |
|
dummy_hcd.flags = HCD_USB3 | HCD_SHARED; |
|
else if (mod_data.is_high_speed) |
|
dummy_hcd.flags = HCD_USB2; |
|
else |
|
dummy_hcd.flags = HCD_USB11; |
|
hs_hcd = usb_create_hcd(&dummy_hcd, &pdev->dev, dev_name(&pdev->dev)); |
|
if (!hs_hcd) |
|
return -ENOMEM; |
|
hs_hcd->has_tt = 1; |
|
|
|
retval = usb_add_hcd(hs_hcd, 0, 0); |
|
if (retval) |
|
goto put_usb2_hcd; |
|
|
|
if (mod_data.is_super_speed) { |
|
ss_hcd = usb_create_shared_hcd(&dummy_hcd, &pdev->dev, |
|
dev_name(&pdev->dev), hs_hcd); |
|
if (!ss_hcd) { |
|
retval = -ENOMEM; |
|
goto dealloc_usb2_hcd; |
|
} |
|
|
|
retval = usb_add_hcd(ss_hcd, 0, 0); |
|
if (retval) |
|
goto put_usb3_hcd; |
|
} |
|
return 0; |
|
|
|
put_usb3_hcd: |
|
usb_put_hcd(ss_hcd); |
|
dealloc_usb2_hcd: |
|
usb_remove_hcd(hs_hcd); |
|
put_usb2_hcd: |
|
usb_put_hcd(hs_hcd); |
|
dum->hs_hcd = dum->ss_hcd = NULL; |
|
return retval; |
|
} |
|
|
|
static int dummy_hcd_remove(struct platform_device *pdev) |
|
{ |
|
struct dummy *dum; |
|
|
|
dum = hcd_to_dummy_hcd(platform_get_drvdata(pdev))->dum; |
|
|
|
if (dum->ss_hcd) { |
|
usb_remove_hcd(dummy_hcd_to_hcd(dum->ss_hcd)); |
|
usb_put_hcd(dummy_hcd_to_hcd(dum->ss_hcd)); |
|
} |
|
|
|
usb_remove_hcd(dummy_hcd_to_hcd(dum->hs_hcd)); |
|
usb_put_hcd(dummy_hcd_to_hcd(dum->hs_hcd)); |
|
|
|
dum->hs_hcd = NULL; |
|
dum->ss_hcd = NULL; |
|
|
|
return 0; |
|
} |
|
|
|
static int dummy_hcd_suspend(struct platform_device *pdev, pm_message_t state) |
|
{ |
|
struct usb_hcd *hcd; |
|
struct dummy_hcd *dum_hcd; |
|
int rc = 0; |
|
|
|
dev_dbg(&pdev->dev, "%s\n", __func__); |
|
|
|
hcd = platform_get_drvdata(pdev); |
|
dum_hcd = hcd_to_dummy_hcd(hcd); |
|
if (dum_hcd->rh_state == DUMMY_RH_RUNNING) { |
|
dev_warn(&pdev->dev, "Root hub isn't suspended!\n"); |
|
rc = -EBUSY; |
|
} else |
|
clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags); |
|
return rc; |
|
} |
|
|
|
static int dummy_hcd_resume(struct platform_device *pdev) |
|
{ |
|
struct usb_hcd *hcd; |
|
|
|
dev_dbg(&pdev->dev, "%s\n", __func__); |
|
|
|
hcd = platform_get_drvdata(pdev); |
|
set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags); |
|
usb_hcd_poll_rh_status(hcd); |
|
return 0; |
|
} |
|
|
|
static struct platform_driver dummy_hcd_driver = { |
|
.probe = dummy_hcd_probe, |
|
.remove = dummy_hcd_remove, |
|
.suspend = dummy_hcd_suspend, |
|
.resume = dummy_hcd_resume, |
|
.driver = { |
|
.name = driver_name, |
|
}, |
|
}; |
|
|
|
/*-------------------------------------------------------------------------*/ |
|
#define MAX_NUM_UDC 32 |
|
static struct platform_device *the_udc_pdev[MAX_NUM_UDC]; |
|
static struct platform_device *the_hcd_pdev[MAX_NUM_UDC]; |
|
|
|
static int __init init(void) |
|
{ |
|
int retval = -ENOMEM; |
|
int i; |
|
struct dummy *dum[MAX_NUM_UDC] = {}; |
|
|
|
if (usb_disabled()) |
|
return -ENODEV; |
|
|
|
if (!mod_data.is_high_speed && mod_data.is_super_speed) |
|
return -EINVAL; |
|
|
|
if (mod_data.num < 1 || mod_data.num > MAX_NUM_UDC) { |
|
pr_err("Number of emulated UDC must be in range of 1...%d\n", |
|
MAX_NUM_UDC); |
|
return -EINVAL; |
|
} |
|
|
|
for (i = 0; i < mod_data.num; i++) { |
|
the_hcd_pdev[i] = platform_device_alloc(driver_name, i); |
|
if (!the_hcd_pdev[i]) { |
|
i--; |
|
while (i >= 0) |
|
platform_device_put(the_hcd_pdev[i--]); |
|
return retval; |
|
} |
|
} |
|
for (i = 0; i < mod_data.num; i++) { |
|
the_udc_pdev[i] = platform_device_alloc(gadget_name, i); |
|
if (!the_udc_pdev[i]) { |
|
i--; |
|
while (i >= 0) |
|
platform_device_put(the_udc_pdev[i--]); |
|
goto err_alloc_udc; |
|
} |
|
} |
|
for (i = 0; i < mod_data.num; i++) { |
|
dum[i] = kzalloc(sizeof(struct dummy), GFP_KERNEL); |
|
if (!dum[i]) { |
|
retval = -ENOMEM; |
|
goto err_add_pdata; |
|
} |
|
retval = platform_device_add_data(the_hcd_pdev[i], &dum[i], |
|
sizeof(void *)); |
|
if (retval) |
|
goto err_add_pdata; |
|
retval = platform_device_add_data(the_udc_pdev[i], &dum[i], |
|
sizeof(void *)); |
|
if (retval) |
|
goto err_add_pdata; |
|
} |
|
|
|
retval = platform_driver_register(&dummy_hcd_driver); |
|
if (retval < 0) |
|
goto err_add_pdata; |
|
retval = platform_driver_register(&dummy_udc_driver); |
|
if (retval < 0) |
|
goto err_register_udc_driver; |
|
|
|
for (i = 0; i < mod_data.num; i++) { |
|
retval = platform_device_add(the_hcd_pdev[i]); |
|
if (retval < 0) { |
|
i--; |
|
while (i >= 0) |
|
platform_device_del(the_hcd_pdev[i--]); |
|
goto err_add_hcd; |
|
} |
|
} |
|
for (i = 0; i < mod_data.num; i++) { |
|
if (!dum[i]->hs_hcd || |
|
(!dum[i]->ss_hcd && mod_data.is_super_speed)) { |
|
/* |
|
* The hcd was added successfully but its probe |
|
* function failed for some reason. |
|
*/ |
|
retval = -EINVAL; |
|
goto err_add_udc; |
|
} |
|
} |
|
|
|
for (i = 0; i < mod_data.num; i++) { |
|
retval = platform_device_add(the_udc_pdev[i]); |
|
if (retval < 0) { |
|
i--; |
|
while (i >= 0) |
|
platform_device_del(the_udc_pdev[i--]); |
|
goto err_add_udc; |
|
} |
|
} |
|
|
|
for (i = 0; i < mod_data.num; i++) { |
|
if (!platform_get_drvdata(the_udc_pdev[i])) { |
|
/* |
|
* The udc was added successfully but its probe |
|
* function failed for some reason. |
|
*/ |
|
retval = -EINVAL; |
|
goto err_probe_udc; |
|
} |
|
} |
|
return retval; |
|
|
|
err_probe_udc: |
|
for (i = 0; i < mod_data.num; i++) |
|
platform_device_del(the_udc_pdev[i]); |
|
err_add_udc: |
|
for (i = 0; i < mod_data.num; i++) |
|
platform_device_del(the_hcd_pdev[i]); |
|
err_add_hcd: |
|
platform_driver_unregister(&dummy_udc_driver); |
|
err_register_udc_driver: |
|
platform_driver_unregister(&dummy_hcd_driver); |
|
err_add_pdata: |
|
for (i = 0; i < mod_data.num; i++) |
|
kfree(dum[i]); |
|
for (i = 0; i < mod_data.num; i++) |
|
platform_device_put(the_udc_pdev[i]); |
|
err_alloc_udc: |
|
for (i = 0; i < mod_data.num; i++) |
|
platform_device_put(the_hcd_pdev[i]); |
|
return retval; |
|
} |
|
module_init(init); |
|
|
|
static void __exit cleanup(void) |
|
{ |
|
int i; |
|
|
|
for (i = 0; i < mod_data.num; i++) { |
|
struct dummy *dum; |
|
|
|
dum = *((void **)dev_get_platdata(&the_udc_pdev[i]->dev)); |
|
|
|
platform_device_unregister(the_udc_pdev[i]); |
|
platform_device_unregister(the_hcd_pdev[i]); |
|
kfree(dum); |
|
} |
|
platform_driver_unregister(&dummy_udc_driver); |
|
platform_driver_unregister(&dummy_hcd_driver); |
|
} |
|
module_exit(cleanup);
|
|
|