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1326 lines
35 KiB
1326 lines
35 KiB
/*
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* zero.c -- Gadget Zero, for USB development
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*
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* Copyright (C) 2003-2004 David Brownell
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions, and the following disclaimer,
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* without modification.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The names of the above-listed copyright holders may not be used
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* to endorse or promote products derived from this software without
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* specific prior written permission.
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*
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* ALTERNATIVELY, this software may be distributed under the terms of the
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* GNU General Public License ("GPL") as published by the Free Software
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* Foundation, either version 2 of that License or (at your option) any
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* later version.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
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* IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* Gadget Zero only needs two bulk endpoints, and is an example of how you
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* can write a hardware-agnostic gadget driver running inside a USB device.
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*
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* Hardware details are visible (see CONFIG_USB_ZERO_* below) but don't
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* affect most of the driver.
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*
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* Use it with the Linux host/master side "usbtest" driver to get a basic
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* functional test of your device-side usb stack, or with "usb-skeleton".
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*
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* It supports two similar configurations. One sinks whatever the usb host
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* writes, and in return sources zeroes. The other loops whatever the host
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* writes back, so the host can read it. Module options include:
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*
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* buflen=N default N=4096, buffer size used
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* qlen=N default N=32, how many buffers in the loopback queue
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* loopdefault default false, list loopback config first
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*
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* Many drivers will only have one configuration, letting them be much
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* simpler if they also don't support high speed operation (like this
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* driver does).
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*/
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#define DEBUG 1
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// #define VERBOSE
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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/sched.h>
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#include <linux/slab.h>
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#include <linux/smp_lock.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/utsname.h>
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#include <linux/device.h>
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#include <linux/moduleparam.h>
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#include <asm/byteorder.h>
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#include <asm/io.h>
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#include <asm/irq.h>
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#include <asm/system.h>
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#include <asm/unaligned.h>
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#include <linux/usb_ch9.h>
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#include <linux/usb_gadget.h>
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#include "gadget_chips.h"
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/*-------------------------------------------------------------------------*/
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#define DRIVER_VERSION "St Patrick's Day 2004"
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static const char shortname [] = "zero";
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static const char longname [] = "Gadget Zero";
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static const char source_sink [] = "source and sink data";
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static const char loopback [] = "loop input to output";
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/*-------------------------------------------------------------------------*/
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/*
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* driver assumes self-powered hardware, and
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* has no way for users to trigger remote wakeup.
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*
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* this version autoconfigures as much as possible,
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* which is reasonable for most "bulk-only" drivers.
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*/
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static const char *EP_IN_NAME; /* source */
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static const char *EP_OUT_NAME; /* sink */
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/*-------------------------------------------------------------------------*/
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/* big enough to hold our biggest descriptor */
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#define USB_BUFSIZ 256
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struct zero_dev {
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spinlock_t lock;
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struct usb_gadget *gadget;
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struct usb_request *req; /* for control responses */
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/* when configured, we have one of two configs:
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* - source data (in to host) and sink it (out from host)
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* - or loop it back (out from host back in to host)
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*/
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u8 config;
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struct usb_ep *in_ep, *out_ep;
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/* autoresume timer */
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struct timer_list resume;
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};
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#define xprintk(d,level,fmt,args...) \
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dev_printk(level , &(d)->gadget->dev , fmt , ## args)
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#ifdef DEBUG
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#define DBG(dev,fmt,args...) \
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xprintk(dev , KERN_DEBUG , fmt , ## args)
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#else
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#define DBG(dev,fmt,args...) \
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do { } while (0)
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#endif /* DEBUG */
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#ifdef VERBOSE
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#define VDBG DBG
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#else
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#define VDBG(dev,fmt,args...) \
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do { } while (0)
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#endif /* VERBOSE */
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#define ERROR(dev,fmt,args...) \
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xprintk(dev , KERN_ERR , fmt , ## args)
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#define WARN(dev,fmt,args...) \
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xprintk(dev , KERN_WARNING , fmt , ## args)
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#define INFO(dev,fmt,args...) \
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xprintk(dev , KERN_INFO , fmt , ## args)
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/*-------------------------------------------------------------------------*/
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static unsigned buflen = 4096;
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static unsigned qlen = 32;
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static unsigned pattern = 0;
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module_param (buflen, uint, S_IRUGO);
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module_param (qlen, uint, S_IRUGO);
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module_param (pattern, uint, S_IRUGO|S_IWUSR);
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/*
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* if it's nonzero, autoresume says how many seconds to wait
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* before trying to wake up the host after suspend.
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*/
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static unsigned autoresume = 0;
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module_param (autoresume, uint, 0);
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/*
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* Normally the "loopback" configuration is second (index 1) so
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* it's not the default. Here's where to change that order, to
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* work better with hosts where config changes are problematic.
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* Or controllers (like superh) that only support one config.
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*/
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static int loopdefault = 0;
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module_param (loopdefault, bool, S_IRUGO|S_IWUSR);
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/*-------------------------------------------------------------------------*/
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/* Thanks to NetChip Technologies for donating this product ID.
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*
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* DO NOT REUSE THESE IDs with a protocol-incompatible driver!! Ever!!
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* Instead: allocate your own, using normal USB-IF procedures.
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*/
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#ifndef CONFIG_USB_ZERO_HNPTEST
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#define DRIVER_VENDOR_NUM 0x0525 /* NetChip */
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#define DRIVER_PRODUCT_NUM 0xa4a0 /* Linux-USB "Gadget Zero" */
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#else
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#define DRIVER_VENDOR_NUM 0x1a0a /* OTG test device IDs */
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#define DRIVER_PRODUCT_NUM 0xbadd
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#endif
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/*-------------------------------------------------------------------------*/
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/*
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* DESCRIPTORS ... most are static, but strings and (full)
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* configuration descriptors are built on demand.
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*/
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#define STRING_MANUFACTURER 25
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#define STRING_PRODUCT 42
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#define STRING_SERIAL 101
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#define STRING_SOURCE_SINK 250
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#define STRING_LOOPBACK 251
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/*
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* This device advertises two configurations; these numbers work
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* on a pxa250 as well as more flexible hardware.
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*/
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#define CONFIG_SOURCE_SINK 3
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#define CONFIG_LOOPBACK 2
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static struct usb_device_descriptor
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device_desc = {
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.bLength = sizeof device_desc,
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.bDescriptorType = USB_DT_DEVICE,
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.bcdUSB = __constant_cpu_to_le16 (0x0200),
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.bDeviceClass = USB_CLASS_VENDOR_SPEC,
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.idVendor = __constant_cpu_to_le16 (DRIVER_VENDOR_NUM),
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.idProduct = __constant_cpu_to_le16 (DRIVER_PRODUCT_NUM),
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.iManufacturer = STRING_MANUFACTURER,
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.iProduct = STRING_PRODUCT,
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.iSerialNumber = STRING_SERIAL,
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.bNumConfigurations = 2,
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};
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static struct usb_config_descriptor
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source_sink_config = {
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.bLength = sizeof source_sink_config,
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.bDescriptorType = USB_DT_CONFIG,
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/* compute wTotalLength on the fly */
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.bNumInterfaces = 1,
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.bConfigurationValue = CONFIG_SOURCE_SINK,
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.iConfiguration = STRING_SOURCE_SINK,
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.bmAttributes = USB_CONFIG_ATT_ONE | USB_CONFIG_ATT_SELFPOWER,
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.bMaxPower = 1, /* self-powered */
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};
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static struct usb_config_descriptor
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loopback_config = {
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.bLength = sizeof loopback_config,
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.bDescriptorType = USB_DT_CONFIG,
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/* compute wTotalLength on the fly */
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.bNumInterfaces = 1,
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.bConfigurationValue = CONFIG_LOOPBACK,
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.iConfiguration = STRING_LOOPBACK,
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.bmAttributes = USB_CONFIG_ATT_ONE | USB_CONFIG_ATT_SELFPOWER,
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.bMaxPower = 1, /* self-powered */
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};
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static struct usb_otg_descriptor
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otg_descriptor = {
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.bLength = sizeof otg_descriptor,
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.bDescriptorType = USB_DT_OTG,
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.bmAttributes = USB_OTG_SRP,
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};
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/* one interface in each configuration */
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static const struct usb_interface_descriptor
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source_sink_intf = {
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.bLength = sizeof source_sink_intf,
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.bDescriptorType = USB_DT_INTERFACE,
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.bNumEndpoints = 2,
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.bInterfaceClass = USB_CLASS_VENDOR_SPEC,
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.iInterface = STRING_SOURCE_SINK,
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};
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static const struct usb_interface_descriptor
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loopback_intf = {
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.bLength = sizeof loopback_intf,
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.bDescriptorType = USB_DT_INTERFACE,
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.bNumEndpoints = 2,
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.bInterfaceClass = USB_CLASS_VENDOR_SPEC,
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.iInterface = STRING_LOOPBACK,
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};
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/* two full speed bulk endpoints; their use is config-dependent */
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static struct usb_endpoint_descriptor
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fs_source_desc = {
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.bLength = USB_DT_ENDPOINT_SIZE,
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.bDescriptorType = USB_DT_ENDPOINT,
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.bEndpointAddress = USB_DIR_IN,
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.bmAttributes = USB_ENDPOINT_XFER_BULK,
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};
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static struct usb_endpoint_descriptor
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fs_sink_desc = {
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.bLength = USB_DT_ENDPOINT_SIZE,
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.bDescriptorType = USB_DT_ENDPOINT,
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.bEndpointAddress = USB_DIR_OUT,
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.bmAttributes = USB_ENDPOINT_XFER_BULK,
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};
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static const struct usb_descriptor_header *fs_source_sink_function [] = {
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(struct usb_descriptor_header *) &otg_descriptor,
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(struct usb_descriptor_header *) &source_sink_intf,
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(struct usb_descriptor_header *) &fs_sink_desc,
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(struct usb_descriptor_header *) &fs_source_desc,
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NULL,
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};
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static const struct usb_descriptor_header *fs_loopback_function [] = {
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(struct usb_descriptor_header *) &otg_descriptor,
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(struct usb_descriptor_header *) &loopback_intf,
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(struct usb_descriptor_header *) &fs_sink_desc,
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(struct usb_descriptor_header *) &fs_source_desc,
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NULL,
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};
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#ifdef CONFIG_USB_GADGET_DUALSPEED
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/*
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* usb 2.0 devices need to expose both high speed and full speed
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* descriptors, unless they only run at full speed.
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*
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* that means alternate endpoint descriptors (bigger packets)
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* and a "device qualifier" ... plus more construction options
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* for the config descriptor.
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*/
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static struct usb_endpoint_descriptor
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hs_source_desc = {
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.bLength = USB_DT_ENDPOINT_SIZE,
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.bDescriptorType = USB_DT_ENDPOINT,
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.bmAttributes = USB_ENDPOINT_XFER_BULK,
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.wMaxPacketSize = __constant_cpu_to_le16 (512),
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};
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static struct usb_endpoint_descriptor
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hs_sink_desc = {
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.bLength = USB_DT_ENDPOINT_SIZE,
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.bDescriptorType = USB_DT_ENDPOINT,
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.bmAttributes = USB_ENDPOINT_XFER_BULK,
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.wMaxPacketSize = __constant_cpu_to_le16 (512),
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};
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static struct usb_qualifier_descriptor
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dev_qualifier = {
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.bLength = sizeof dev_qualifier,
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.bDescriptorType = USB_DT_DEVICE_QUALIFIER,
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.bcdUSB = __constant_cpu_to_le16 (0x0200),
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.bDeviceClass = USB_CLASS_VENDOR_SPEC,
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.bNumConfigurations = 2,
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};
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static const struct usb_descriptor_header *hs_source_sink_function [] = {
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(struct usb_descriptor_header *) &otg_descriptor,
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(struct usb_descriptor_header *) &source_sink_intf,
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(struct usb_descriptor_header *) &hs_source_desc,
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(struct usb_descriptor_header *) &hs_sink_desc,
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NULL,
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};
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static const struct usb_descriptor_header *hs_loopback_function [] = {
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(struct usb_descriptor_header *) &otg_descriptor,
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(struct usb_descriptor_header *) &loopback_intf,
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(struct usb_descriptor_header *) &hs_source_desc,
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(struct usb_descriptor_header *) &hs_sink_desc,
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NULL,
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};
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/* maxpacket and other transfer characteristics vary by speed. */
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#define ep_desc(g,hs,fs) (((g)->speed==USB_SPEED_HIGH)?(hs):(fs))
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#else
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/* if there's no high speed support, maxpacket doesn't change. */
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#define ep_desc(g,hs,fs) fs
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#endif /* !CONFIG_USB_GADGET_DUALSPEED */
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static char manufacturer [50];
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static char serial [40];
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/* static strings, in UTF-8 */
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static struct usb_string strings [] = {
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{ STRING_MANUFACTURER, manufacturer, },
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{ STRING_PRODUCT, longname, },
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{ STRING_SERIAL, serial, },
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{ STRING_LOOPBACK, loopback, },
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{ STRING_SOURCE_SINK, source_sink, },
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{ } /* end of list */
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};
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static struct usb_gadget_strings stringtab = {
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.language = 0x0409, /* en-us */
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.strings = strings,
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};
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|
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/*
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* config descriptors are also handcrafted. these must agree with code
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* that sets configurations, and with code managing interfaces and their
|
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* altsettings. other complexity may come from:
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*
|
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* - high speed support, including "other speed config" rules
|
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* - multiple configurations
|
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* - interfaces with alternate settings
|
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* - embedded class or vendor-specific descriptors
|
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*
|
|
* this handles high speed, and has a second config that could as easily
|
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* have been an alternate interface setting (on most hardware).
|
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*
|
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* NOTE: to demonstrate (and test) more USB capabilities, this driver
|
|
* should include an altsetting to test interrupt transfers, including
|
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* high bandwidth modes at high speed. (Maybe work like Intel's test
|
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* device?)
|
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*/
|
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static int
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config_buf (struct usb_gadget *gadget,
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u8 *buf, u8 type, unsigned index)
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{
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int is_source_sink;
|
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int len;
|
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const struct usb_descriptor_header **function;
|
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#ifdef CONFIG_USB_GADGET_DUALSPEED
|
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int hs = (gadget->speed == USB_SPEED_HIGH);
|
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#endif
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|
|
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/* two configurations will always be index 0 and index 1 */
|
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if (index > 1)
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return -EINVAL;
|
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is_source_sink = loopdefault ? (index == 1) : (index == 0);
|
|
|
|
#ifdef CONFIG_USB_GADGET_DUALSPEED
|
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if (type == USB_DT_OTHER_SPEED_CONFIG)
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hs = !hs;
|
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if (hs)
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function = is_source_sink
|
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? hs_source_sink_function
|
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: hs_loopback_function;
|
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else
|
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#endif
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function = is_source_sink
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? fs_source_sink_function
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: fs_loopback_function;
|
|
|
|
/* for now, don't advertise srp-only devices */
|
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if (!gadget->is_otg)
|
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function++;
|
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|
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len = usb_gadget_config_buf (is_source_sink
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? &source_sink_config
|
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: &loopback_config,
|
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buf, USB_BUFSIZ, function);
|
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if (len < 0)
|
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return len;
|
|
((struct usb_config_descriptor *) buf)->bDescriptorType = type;
|
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return len;
|
|
}
|
|
|
|
/*-------------------------------------------------------------------------*/
|
|
|
|
static struct usb_request *
|
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alloc_ep_req (struct usb_ep *ep, unsigned length)
|
|
{
|
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struct usb_request *req;
|
|
|
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req = usb_ep_alloc_request (ep, GFP_ATOMIC);
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if (req) {
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req->length = length;
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req->buf = usb_ep_alloc_buffer (ep, length,
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&req->dma, GFP_ATOMIC);
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if (!req->buf) {
|
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usb_ep_free_request (ep, req);
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req = NULL;
|
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}
|
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}
|
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return req;
|
|
}
|
|
|
|
static void free_ep_req (struct usb_ep *ep, struct usb_request *req)
|
|
{
|
|
if (req->buf)
|
|
usb_ep_free_buffer (ep, req->buf, req->dma, req->length);
|
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usb_ep_free_request (ep, req);
|
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}
|
|
|
|
/*-------------------------------------------------------------------------*/
|
|
|
|
/* optionally require specific source/sink data patterns */
|
|
|
|
static int
|
|
check_read_data (
|
|
struct zero_dev *dev,
|
|
struct usb_ep *ep,
|
|
struct usb_request *req
|
|
)
|
|
{
|
|
unsigned i;
|
|
u8 *buf = req->buf;
|
|
|
|
for (i = 0; i < req->actual; i++, buf++) {
|
|
switch (pattern) {
|
|
/* all-zeroes has no synchronization issues */
|
|
case 0:
|
|
if (*buf == 0)
|
|
continue;
|
|
break;
|
|
/* mod63 stays in sync with short-terminated transfers,
|
|
* or otherwise when host and gadget agree on how large
|
|
* each usb transfer request should be. resync is done
|
|
* with set_interface or set_config.
|
|
*/
|
|
case 1:
|
|
if (*buf == (u8)(i % 63))
|
|
continue;
|
|
break;
|
|
}
|
|
ERROR (dev, "bad OUT byte, buf [%d] = %d\n", i, *buf);
|
|
usb_ep_set_halt (ep);
|
|
return -EINVAL;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static void
|
|
reinit_write_data (
|
|
struct zero_dev *dev,
|
|
struct usb_ep *ep,
|
|
struct usb_request *req
|
|
)
|
|
{
|
|
unsigned i;
|
|
u8 *buf = req->buf;
|
|
|
|
switch (pattern) {
|
|
case 0:
|
|
memset (req->buf, 0, req->length);
|
|
break;
|
|
case 1:
|
|
for (i = 0; i < req->length; i++)
|
|
*buf++ = (u8) (i % 63);
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* if there is only one request in the queue, there'll always be an
|
|
* irq delay between end of one request and start of the next.
|
|
* that prevents using hardware dma queues.
|
|
*/
|
|
static void source_sink_complete (struct usb_ep *ep, struct usb_request *req)
|
|
{
|
|
struct zero_dev *dev = ep->driver_data;
|
|
int status = req->status;
|
|
|
|
switch (status) {
|
|
|
|
case 0: /* normal completion? */
|
|
if (ep == dev->out_ep) {
|
|
check_read_data (dev, ep, req);
|
|
memset (req->buf, 0x55, req->length);
|
|
} else
|
|
reinit_write_data (dev, ep, req);
|
|
break;
|
|
|
|
/* this endpoint is normally active while we're configured */
|
|
case -ECONNABORTED: /* hardware forced ep reset */
|
|
case -ECONNRESET: /* request dequeued */
|
|
case -ESHUTDOWN: /* disconnect from host */
|
|
VDBG (dev, "%s gone (%d), %d/%d\n", ep->name, status,
|
|
req->actual, req->length);
|
|
if (ep == dev->out_ep)
|
|
check_read_data (dev, ep, req);
|
|
free_ep_req (ep, req);
|
|
return;
|
|
|
|
case -EOVERFLOW: /* buffer overrun on read means that
|
|
* we didn't provide a big enough
|
|
* buffer.
|
|
*/
|
|
default:
|
|
#if 1
|
|
DBG (dev, "%s complete --> %d, %d/%d\n", ep->name,
|
|
status, req->actual, req->length);
|
|
#endif
|
|
case -EREMOTEIO: /* short read */
|
|
break;
|
|
}
|
|
|
|
status = usb_ep_queue (ep, req, GFP_ATOMIC);
|
|
if (status) {
|
|
ERROR (dev, "kill %s: resubmit %d bytes --> %d\n",
|
|
ep->name, req->length, status);
|
|
usb_ep_set_halt (ep);
|
|
/* FIXME recover later ... somehow */
|
|
}
|
|
}
|
|
|
|
static struct usb_request *
|
|
source_sink_start_ep (struct usb_ep *ep, gfp_t gfp_flags)
|
|
{
|
|
struct usb_request *req;
|
|
int status;
|
|
|
|
req = alloc_ep_req (ep, buflen);
|
|
if (!req)
|
|
return NULL;
|
|
|
|
memset (req->buf, 0, req->length);
|
|
req->complete = source_sink_complete;
|
|
|
|
if (strcmp (ep->name, EP_IN_NAME) == 0)
|
|
reinit_write_data (ep->driver_data, ep, req);
|
|
else
|
|
memset (req->buf, 0x55, req->length);
|
|
|
|
status = usb_ep_queue (ep, req, gfp_flags);
|
|
if (status) {
|
|
struct zero_dev *dev = ep->driver_data;
|
|
|
|
ERROR (dev, "start %s --> %d\n", ep->name, status);
|
|
free_ep_req (ep, req);
|
|
req = NULL;
|
|
}
|
|
|
|
return req;
|
|
}
|
|
|
|
static int
|
|
set_source_sink_config (struct zero_dev *dev, gfp_t gfp_flags)
|
|
{
|
|
int result = 0;
|
|
struct usb_ep *ep;
|
|
struct usb_gadget *gadget = dev->gadget;
|
|
|
|
gadget_for_each_ep (ep, gadget) {
|
|
const struct usb_endpoint_descriptor *d;
|
|
|
|
/* one endpoint writes (sources) zeroes in (to the host) */
|
|
if (strcmp (ep->name, EP_IN_NAME) == 0) {
|
|
d = ep_desc (gadget, &hs_source_desc, &fs_source_desc);
|
|
result = usb_ep_enable (ep, d);
|
|
if (result == 0) {
|
|
ep->driver_data = dev;
|
|
if (source_sink_start_ep (ep, gfp_flags) != 0) {
|
|
dev->in_ep = ep;
|
|
continue;
|
|
}
|
|
usb_ep_disable (ep);
|
|
result = -EIO;
|
|
}
|
|
|
|
/* one endpoint reads (sinks) anything out (from the host) */
|
|
} else if (strcmp (ep->name, EP_OUT_NAME) == 0) {
|
|
d = ep_desc (gadget, &hs_sink_desc, &fs_sink_desc);
|
|
result = usb_ep_enable (ep, d);
|
|
if (result == 0) {
|
|
ep->driver_data = dev;
|
|
if (source_sink_start_ep (ep, gfp_flags) != 0) {
|
|
dev->out_ep = ep;
|
|
continue;
|
|
}
|
|
usb_ep_disable (ep);
|
|
result = -EIO;
|
|
}
|
|
|
|
/* ignore any other endpoints */
|
|
} else
|
|
continue;
|
|
|
|
/* stop on error */
|
|
ERROR (dev, "can't start %s, result %d\n", ep->name, result);
|
|
break;
|
|
}
|
|
if (result == 0)
|
|
DBG (dev, "buflen %d\n", buflen);
|
|
|
|
/* caller is responsible for cleanup on error */
|
|
return result;
|
|
}
|
|
|
|
/*-------------------------------------------------------------------------*/
|
|
|
|
static void loopback_complete (struct usb_ep *ep, struct usb_request *req)
|
|
{
|
|
struct zero_dev *dev = ep->driver_data;
|
|
int status = req->status;
|
|
|
|
switch (status) {
|
|
|
|
case 0: /* normal completion? */
|
|
if (ep == dev->out_ep) {
|
|
/* loop this OUT packet back IN to the host */
|
|
req->zero = (req->actual < req->length);
|
|
req->length = req->actual;
|
|
status = usb_ep_queue (dev->in_ep, req, GFP_ATOMIC);
|
|
if (status == 0)
|
|
return;
|
|
|
|
/* "should never get here" */
|
|
ERROR (dev, "can't loop %s to %s: %d\n",
|
|
ep->name, dev->in_ep->name,
|
|
status);
|
|
}
|
|
|
|
/* queue the buffer for some later OUT packet */
|
|
req->length = buflen;
|
|
status = usb_ep_queue (dev->out_ep, req, GFP_ATOMIC);
|
|
if (status == 0)
|
|
return;
|
|
|
|
/* "should never get here" */
|
|
/* FALLTHROUGH */
|
|
|
|
default:
|
|
ERROR (dev, "%s loop complete --> %d, %d/%d\n", ep->name,
|
|
status, req->actual, req->length);
|
|
/* FALLTHROUGH */
|
|
|
|
/* NOTE: since this driver doesn't maintain an explicit record
|
|
* of requests it submitted (just maintains qlen count), we
|
|
* rely on the hardware driver to clean up on disconnect or
|
|
* endpoint disable.
|
|
*/
|
|
case -ECONNABORTED: /* hardware forced ep reset */
|
|
case -ECONNRESET: /* request dequeued */
|
|
case -ESHUTDOWN: /* disconnect from host */
|
|
free_ep_req (ep, req);
|
|
return;
|
|
}
|
|
}
|
|
|
|
static int
|
|
set_loopback_config (struct zero_dev *dev, gfp_t gfp_flags)
|
|
{
|
|
int result = 0;
|
|
struct usb_ep *ep;
|
|
struct usb_gadget *gadget = dev->gadget;
|
|
|
|
gadget_for_each_ep (ep, gadget) {
|
|
const struct usb_endpoint_descriptor *d;
|
|
|
|
/* one endpoint writes data back IN to the host */
|
|
if (strcmp (ep->name, EP_IN_NAME) == 0) {
|
|
d = ep_desc (gadget, &hs_source_desc, &fs_source_desc);
|
|
result = usb_ep_enable (ep, d);
|
|
if (result == 0) {
|
|
ep->driver_data = dev;
|
|
dev->in_ep = ep;
|
|
continue;
|
|
}
|
|
|
|
/* one endpoint just reads OUT packets */
|
|
} else if (strcmp (ep->name, EP_OUT_NAME) == 0) {
|
|
d = ep_desc (gadget, &hs_sink_desc, &fs_sink_desc);
|
|
result = usb_ep_enable (ep, d);
|
|
if (result == 0) {
|
|
ep->driver_data = dev;
|
|
dev->out_ep = ep;
|
|
continue;
|
|
}
|
|
|
|
/* ignore any other endpoints */
|
|
} else
|
|
continue;
|
|
|
|
/* stop on error */
|
|
ERROR (dev, "can't enable %s, result %d\n", ep->name, result);
|
|
break;
|
|
}
|
|
|
|
/* allocate a bunch of read buffers and queue them all at once.
|
|
* we buffer at most 'qlen' transfers; fewer if any need more
|
|
* than 'buflen' bytes each.
|
|
*/
|
|
if (result == 0) {
|
|
struct usb_request *req;
|
|
unsigned i;
|
|
|
|
ep = dev->out_ep;
|
|
for (i = 0; i < qlen && result == 0; i++) {
|
|
req = alloc_ep_req (ep, buflen);
|
|
if (req) {
|
|
req->complete = loopback_complete;
|
|
result = usb_ep_queue (ep, req, GFP_ATOMIC);
|
|
if (result)
|
|
DBG (dev, "%s queue req --> %d\n",
|
|
ep->name, result);
|
|
} else
|
|
result = -ENOMEM;
|
|
}
|
|
}
|
|
if (result == 0)
|
|
DBG (dev, "qlen %d, buflen %d\n", qlen, buflen);
|
|
|
|
/* caller is responsible for cleanup on error */
|
|
return result;
|
|
}
|
|
|
|
/*-------------------------------------------------------------------------*/
|
|
|
|
static void zero_reset_config (struct zero_dev *dev)
|
|
{
|
|
if (dev->config == 0)
|
|
return;
|
|
|
|
DBG (dev, "reset config\n");
|
|
|
|
/* just disable endpoints, forcing completion of pending i/o.
|
|
* all our completion handlers free their requests in this case.
|
|
*/
|
|
if (dev->in_ep) {
|
|
usb_ep_disable (dev->in_ep);
|
|
dev->in_ep = NULL;
|
|
}
|
|
if (dev->out_ep) {
|
|
usb_ep_disable (dev->out_ep);
|
|
dev->out_ep = NULL;
|
|
}
|
|
dev->config = 0;
|
|
del_timer (&dev->resume);
|
|
}
|
|
|
|
/* change our operational config. this code must agree with the code
|
|
* that returns config descriptors, and altsetting code.
|
|
*
|
|
* it's also responsible for power management interactions. some
|
|
* configurations might not work with our current power sources.
|
|
*
|
|
* note that some device controller hardware will constrain what this
|
|
* code can do, perhaps by disallowing more than one configuration or
|
|
* by limiting configuration choices (like the pxa2xx).
|
|
*/
|
|
static int
|
|
zero_set_config (struct zero_dev *dev, unsigned number, gfp_t gfp_flags)
|
|
{
|
|
int result = 0;
|
|
struct usb_gadget *gadget = dev->gadget;
|
|
|
|
if (number == dev->config)
|
|
return 0;
|
|
|
|
if (gadget_is_sa1100 (gadget) && dev->config) {
|
|
/* tx fifo is full, but we can't clear it...*/
|
|
INFO (dev, "can't change configurations\n");
|
|
return -ESPIPE;
|
|
}
|
|
zero_reset_config (dev);
|
|
|
|
switch (number) {
|
|
case CONFIG_SOURCE_SINK:
|
|
result = set_source_sink_config (dev, gfp_flags);
|
|
break;
|
|
case CONFIG_LOOPBACK:
|
|
result = set_loopback_config (dev, gfp_flags);
|
|
break;
|
|
default:
|
|
result = -EINVAL;
|
|
/* FALL THROUGH */
|
|
case 0:
|
|
return result;
|
|
}
|
|
|
|
if (!result && (!dev->in_ep || !dev->out_ep))
|
|
result = -ENODEV;
|
|
if (result)
|
|
zero_reset_config (dev);
|
|
else {
|
|
char *speed;
|
|
|
|
switch (gadget->speed) {
|
|
case USB_SPEED_LOW: speed = "low"; break;
|
|
case USB_SPEED_FULL: speed = "full"; break;
|
|
case USB_SPEED_HIGH: speed = "high"; break;
|
|
default: speed = "?"; break;
|
|
}
|
|
|
|
dev->config = number;
|
|
INFO (dev, "%s speed config #%d: %s\n", speed, number,
|
|
(number == CONFIG_SOURCE_SINK)
|
|
? source_sink : loopback);
|
|
}
|
|
return result;
|
|
}
|
|
|
|
/*-------------------------------------------------------------------------*/
|
|
|
|
static void zero_setup_complete (struct usb_ep *ep, struct usb_request *req)
|
|
{
|
|
if (req->status || req->actual != req->length)
|
|
DBG ((struct zero_dev *) ep->driver_data,
|
|
"setup complete --> %d, %d/%d\n",
|
|
req->status, req->actual, req->length);
|
|
}
|
|
|
|
/*
|
|
* The setup() callback implements all the ep0 functionality that's
|
|
* not handled lower down, in hardware or the hardware driver (like
|
|
* device and endpoint feature flags, and their status). It's all
|
|
* housekeeping for the gadget function we're implementing. Most of
|
|
* the work is in config-specific setup.
|
|
*/
|
|
static int
|
|
zero_setup (struct usb_gadget *gadget, const struct usb_ctrlrequest *ctrl)
|
|
{
|
|
struct zero_dev *dev = get_gadget_data (gadget);
|
|
struct usb_request *req = dev->req;
|
|
int value = -EOPNOTSUPP;
|
|
u16 w_index = le16_to_cpu(ctrl->wIndex);
|
|
u16 w_value = le16_to_cpu(ctrl->wValue);
|
|
u16 w_length = le16_to_cpu(ctrl->wLength);
|
|
|
|
/* usually this stores reply data in the pre-allocated ep0 buffer,
|
|
* but config change events will reconfigure hardware.
|
|
*/
|
|
req->zero = 0;
|
|
switch (ctrl->bRequest) {
|
|
|
|
case USB_REQ_GET_DESCRIPTOR:
|
|
if (ctrl->bRequestType != USB_DIR_IN)
|
|
goto unknown;
|
|
switch (w_value >> 8) {
|
|
|
|
case USB_DT_DEVICE:
|
|
value = min (w_length, (u16) sizeof device_desc);
|
|
memcpy (req->buf, &device_desc, value);
|
|
break;
|
|
#ifdef CONFIG_USB_GADGET_DUALSPEED
|
|
case USB_DT_DEVICE_QUALIFIER:
|
|
if (!gadget->is_dualspeed)
|
|
break;
|
|
value = min (w_length, (u16) sizeof dev_qualifier);
|
|
memcpy (req->buf, &dev_qualifier, value);
|
|
break;
|
|
|
|
case USB_DT_OTHER_SPEED_CONFIG:
|
|
if (!gadget->is_dualspeed)
|
|
break;
|
|
// FALLTHROUGH
|
|
#endif /* CONFIG_USB_GADGET_DUALSPEED */
|
|
case USB_DT_CONFIG:
|
|
value = config_buf (gadget, req->buf,
|
|
w_value >> 8,
|
|
w_value & 0xff);
|
|
if (value >= 0)
|
|
value = min (w_length, (u16) value);
|
|
break;
|
|
|
|
case USB_DT_STRING:
|
|
/* wIndex == language code.
|
|
* this driver only handles one language, you can
|
|
* add string tables for other languages, using
|
|
* any UTF-8 characters
|
|
*/
|
|
value = usb_gadget_get_string (&stringtab,
|
|
w_value & 0xff, req->buf);
|
|
if (value >= 0)
|
|
value = min (w_length, (u16) value);
|
|
break;
|
|
}
|
|
break;
|
|
|
|
/* currently two configs, two speeds */
|
|
case USB_REQ_SET_CONFIGURATION:
|
|
if (ctrl->bRequestType != 0)
|
|
goto unknown;
|
|
if (gadget->a_hnp_support)
|
|
DBG (dev, "HNP available\n");
|
|
else if (gadget->a_alt_hnp_support)
|
|
DBG (dev, "HNP needs a different root port\n");
|
|
else
|
|
VDBG (dev, "HNP inactive\n");
|
|
spin_lock (&dev->lock);
|
|
value = zero_set_config (dev, w_value, GFP_ATOMIC);
|
|
spin_unlock (&dev->lock);
|
|
break;
|
|
case USB_REQ_GET_CONFIGURATION:
|
|
if (ctrl->bRequestType != USB_DIR_IN)
|
|
goto unknown;
|
|
*(u8 *)req->buf = dev->config;
|
|
value = min (w_length, (u16) 1);
|
|
break;
|
|
|
|
/* until we add altsetting support, or other interfaces,
|
|
* only 0/0 are possible. pxa2xx only supports 0/0 (poorly)
|
|
* and already killed pending endpoint I/O.
|
|
*/
|
|
case USB_REQ_SET_INTERFACE:
|
|
if (ctrl->bRequestType != USB_RECIP_INTERFACE)
|
|
goto unknown;
|
|
spin_lock (&dev->lock);
|
|
if (dev->config && w_index == 0 && w_value == 0) {
|
|
u8 config = dev->config;
|
|
|
|
/* resets interface configuration, forgets about
|
|
* previous transaction state (queued bufs, etc)
|
|
* and re-inits endpoint state (toggle etc)
|
|
* no response queued, just zero status == success.
|
|
* if we had more than one interface we couldn't
|
|
* use this "reset the config" shortcut.
|
|
*/
|
|
zero_reset_config (dev);
|
|
zero_set_config (dev, config, GFP_ATOMIC);
|
|
value = 0;
|
|
}
|
|
spin_unlock (&dev->lock);
|
|
break;
|
|
case USB_REQ_GET_INTERFACE:
|
|
if (ctrl->bRequestType != (USB_DIR_IN|USB_RECIP_INTERFACE))
|
|
goto unknown;
|
|
if (!dev->config)
|
|
break;
|
|
if (w_index != 0) {
|
|
value = -EDOM;
|
|
break;
|
|
}
|
|
*(u8 *)req->buf = 0;
|
|
value = min (w_length, (u16) 1);
|
|
break;
|
|
|
|
/*
|
|
* These are the same vendor-specific requests supported by
|
|
* Intel's USB 2.0 compliance test devices. We exceed that
|
|
* device spec by allowing multiple-packet requests.
|
|
*/
|
|
case 0x5b: /* control WRITE test -- fill the buffer */
|
|
if (ctrl->bRequestType != (USB_DIR_OUT|USB_TYPE_VENDOR))
|
|
goto unknown;
|
|
if (w_value || w_index)
|
|
break;
|
|
/* just read that many bytes into the buffer */
|
|
if (w_length > USB_BUFSIZ)
|
|
break;
|
|
value = w_length;
|
|
break;
|
|
case 0x5c: /* control READ test -- return the buffer */
|
|
if (ctrl->bRequestType != (USB_DIR_IN|USB_TYPE_VENDOR))
|
|
goto unknown;
|
|
if (w_value || w_index)
|
|
break;
|
|
/* expect those bytes are still in the buffer; send back */
|
|
if (w_length > USB_BUFSIZ
|
|
|| w_length != req->length)
|
|
break;
|
|
value = w_length;
|
|
break;
|
|
|
|
default:
|
|
unknown:
|
|
VDBG (dev,
|
|
"unknown control req%02x.%02x v%04x i%04x l%d\n",
|
|
ctrl->bRequestType, ctrl->bRequest,
|
|
w_value, w_index, w_length);
|
|
}
|
|
|
|
/* respond with data transfer before status phase? */
|
|
if (value >= 0) {
|
|
req->length = value;
|
|
req->zero = value < w_length;
|
|
value = usb_ep_queue (gadget->ep0, req, GFP_ATOMIC);
|
|
if (value < 0) {
|
|
DBG (dev, "ep_queue --> %d\n", value);
|
|
req->status = 0;
|
|
zero_setup_complete (gadget->ep0, req);
|
|
}
|
|
}
|
|
|
|
/* device either stalls (value < 0) or reports success */
|
|
return value;
|
|
}
|
|
|
|
static void
|
|
zero_disconnect (struct usb_gadget *gadget)
|
|
{
|
|
struct zero_dev *dev = get_gadget_data (gadget);
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave (&dev->lock, flags);
|
|
zero_reset_config (dev);
|
|
|
|
/* a more significant application might have some non-usb
|
|
* activities to quiesce here, saving resources like power
|
|
* or pushing the notification up a network stack.
|
|
*/
|
|
spin_unlock_irqrestore (&dev->lock, flags);
|
|
|
|
/* next we may get setup() calls to enumerate new connections;
|
|
* or an unbind() during shutdown (including removing module).
|
|
*/
|
|
}
|
|
|
|
static void
|
|
zero_autoresume (unsigned long _dev)
|
|
{
|
|
struct zero_dev *dev = (struct zero_dev *) _dev;
|
|
int status;
|
|
|
|
/* normally the host would be woken up for something
|
|
* more significant than just a timer firing...
|
|
*/
|
|
if (dev->gadget->speed != USB_SPEED_UNKNOWN) {
|
|
status = usb_gadget_wakeup (dev->gadget);
|
|
DBG (dev, "wakeup --> %d\n", status);
|
|
}
|
|
}
|
|
|
|
/*-------------------------------------------------------------------------*/
|
|
|
|
static void /* __init_or_exit */
|
|
zero_unbind (struct usb_gadget *gadget)
|
|
{
|
|
struct zero_dev *dev = get_gadget_data (gadget);
|
|
|
|
DBG (dev, "unbind\n");
|
|
|
|
/* we've already been disconnected ... no i/o is active */
|
|
if (dev->req) {
|
|
dev->req->length = USB_BUFSIZ;
|
|
free_ep_req (gadget->ep0, dev->req);
|
|
}
|
|
del_timer_sync (&dev->resume);
|
|
kfree (dev);
|
|
set_gadget_data (gadget, NULL);
|
|
}
|
|
|
|
static int __init
|
|
zero_bind (struct usb_gadget *gadget)
|
|
{
|
|
struct zero_dev *dev;
|
|
struct usb_ep *ep;
|
|
int gcnum;
|
|
|
|
/* FIXME this can't yet work right with SH ... it has only
|
|
* one configuration, numbered one.
|
|
*/
|
|
if (gadget_is_sh(gadget))
|
|
return -ENODEV;
|
|
|
|
/* Bulk-only drivers like this one SHOULD be able to
|
|
* autoconfigure on any sane usb controller driver,
|
|
* but there may also be important quirks to address.
|
|
*/
|
|
usb_ep_autoconfig_reset (gadget);
|
|
ep = usb_ep_autoconfig (gadget, &fs_source_desc);
|
|
if (!ep) {
|
|
autoconf_fail:
|
|
printk (KERN_ERR "%s: can't autoconfigure on %s\n",
|
|
shortname, gadget->name);
|
|
return -ENODEV;
|
|
}
|
|
EP_IN_NAME = ep->name;
|
|
ep->driver_data = ep; /* claim */
|
|
|
|
ep = usb_ep_autoconfig (gadget, &fs_sink_desc);
|
|
if (!ep)
|
|
goto autoconf_fail;
|
|
EP_OUT_NAME = ep->name;
|
|
ep->driver_data = ep; /* claim */
|
|
|
|
gcnum = usb_gadget_controller_number (gadget);
|
|
if (gcnum >= 0)
|
|
device_desc.bcdDevice = cpu_to_le16 (0x0200 + gcnum);
|
|
else {
|
|
/* gadget zero is so simple (for now, no altsettings) that
|
|
* it SHOULD NOT have problems with bulk-capable hardware.
|
|
* so warn about unrcognized controllers, don't panic.
|
|
*
|
|
* things like configuration and altsetting numbering
|
|
* can need hardware-specific attention though.
|
|
*/
|
|
printk (KERN_WARNING "%s: controller '%s' not recognized\n",
|
|
shortname, gadget->name);
|
|
device_desc.bcdDevice = __constant_cpu_to_le16 (0x9999);
|
|
}
|
|
|
|
|
|
/* ok, we made sense of the hardware ... */
|
|
dev = kzalloc(sizeof(*dev), SLAB_KERNEL);
|
|
if (!dev)
|
|
return -ENOMEM;
|
|
spin_lock_init (&dev->lock);
|
|
dev->gadget = gadget;
|
|
set_gadget_data (gadget, dev);
|
|
|
|
/* preallocate control response and buffer */
|
|
dev->req = usb_ep_alloc_request (gadget->ep0, GFP_KERNEL);
|
|
if (!dev->req)
|
|
goto enomem;
|
|
dev->req->buf = usb_ep_alloc_buffer (gadget->ep0, USB_BUFSIZ,
|
|
&dev->req->dma, GFP_KERNEL);
|
|
if (!dev->req->buf)
|
|
goto enomem;
|
|
|
|
dev->req->complete = zero_setup_complete;
|
|
|
|
device_desc.bMaxPacketSize0 = gadget->ep0->maxpacket;
|
|
|
|
#ifdef CONFIG_USB_GADGET_DUALSPEED
|
|
/* assume ep0 uses the same value for both speeds ... */
|
|
dev_qualifier.bMaxPacketSize0 = device_desc.bMaxPacketSize0;
|
|
|
|
/* and that all endpoints are dual-speed */
|
|
hs_source_desc.bEndpointAddress = fs_source_desc.bEndpointAddress;
|
|
hs_sink_desc.bEndpointAddress = fs_sink_desc.bEndpointAddress;
|
|
#endif
|
|
|
|
if (gadget->is_otg) {
|
|
otg_descriptor.bmAttributes |= USB_OTG_HNP,
|
|
source_sink_config.bmAttributes |= USB_CONFIG_ATT_WAKEUP;
|
|
loopback_config.bmAttributes |= USB_CONFIG_ATT_WAKEUP;
|
|
}
|
|
|
|
usb_gadget_set_selfpowered (gadget);
|
|
|
|
init_timer (&dev->resume);
|
|
dev->resume.function = zero_autoresume;
|
|
dev->resume.data = (unsigned long) dev;
|
|
if (autoresume) {
|
|
source_sink_config.bmAttributes |= USB_CONFIG_ATT_WAKEUP;
|
|
loopback_config.bmAttributes |= USB_CONFIG_ATT_WAKEUP;
|
|
}
|
|
|
|
gadget->ep0->driver_data = dev;
|
|
|
|
INFO (dev, "%s, version: " DRIVER_VERSION "\n", longname);
|
|
INFO (dev, "using %s, OUT %s IN %s\n", gadget->name,
|
|
EP_OUT_NAME, EP_IN_NAME);
|
|
|
|
snprintf (manufacturer, sizeof manufacturer, "%s %s with %s",
|
|
init_utsname()->sysname, init_utsname()->release,
|
|
gadget->name);
|
|
|
|
return 0;
|
|
|
|
enomem:
|
|
zero_unbind (gadget);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
/*-------------------------------------------------------------------------*/
|
|
|
|
static void
|
|
zero_suspend (struct usb_gadget *gadget)
|
|
{
|
|
struct zero_dev *dev = get_gadget_data (gadget);
|
|
|
|
if (gadget->speed == USB_SPEED_UNKNOWN)
|
|
return;
|
|
|
|
if (autoresume) {
|
|
mod_timer (&dev->resume, jiffies + (HZ * autoresume));
|
|
DBG (dev, "suspend, wakeup in %d seconds\n", autoresume);
|
|
} else
|
|
DBG (dev, "suspend\n");
|
|
}
|
|
|
|
static void
|
|
zero_resume (struct usb_gadget *gadget)
|
|
{
|
|
struct zero_dev *dev = get_gadget_data (gadget);
|
|
|
|
DBG (dev, "resume\n");
|
|
del_timer (&dev->resume);
|
|
}
|
|
|
|
|
|
/*-------------------------------------------------------------------------*/
|
|
|
|
static struct usb_gadget_driver zero_driver = {
|
|
#ifdef CONFIG_USB_GADGET_DUALSPEED
|
|
.speed = USB_SPEED_HIGH,
|
|
#else
|
|
.speed = USB_SPEED_FULL,
|
|
#endif
|
|
.function = (char *) longname,
|
|
.bind = zero_bind,
|
|
.unbind = __exit_p(zero_unbind),
|
|
|
|
.setup = zero_setup,
|
|
.disconnect = zero_disconnect,
|
|
|
|
.suspend = zero_suspend,
|
|
.resume = zero_resume,
|
|
|
|
.driver = {
|
|
.name = (char *) shortname,
|
|
.owner = THIS_MODULE,
|
|
},
|
|
};
|
|
|
|
MODULE_AUTHOR ("David Brownell");
|
|
MODULE_LICENSE ("Dual BSD/GPL");
|
|
|
|
|
|
static int __init init (void)
|
|
{
|
|
/* a real value would likely come through some id prom
|
|
* or module option. this one takes at least two packets.
|
|
*/
|
|
strlcpy (serial, "0123456789.0123456789.0123456789", sizeof serial);
|
|
|
|
return usb_gadget_register_driver (&zero_driver);
|
|
}
|
|
module_init (init);
|
|
|
|
static void __exit cleanup (void)
|
|
{
|
|
usb_gadget_unregister_driver (&zero_driver);
|
|
}
|
|
module_exit (cleanup);
|
|
|
|
|