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linux/drivers/usb/gadget/zero.c
David Brownell a353678d31 [PATCH] USB: gadget section fixups 
Recent section changes broke gadget builds on some platforms.  This patch
is the best fix that's available until better section markings exist:

 - There's a lot of cleanup code that gets used in both init and exit paths;
   stop marking it as "__exit".

   (Best fix for this would be an "__init_or_exit" section marking, putting
   the cleanup in __init when __exit sections get discarded else in __exit.)

 - Stop marking the use-once probe routines as "__init" since references
   to those routines are not allowed from driver structures.  They're now
   marked "__devinit", which in practice is a net lose.

   (Best fix for this is likely to separate such use-once probe routines
   from the driver structure ... but in general, all busses that aren't
   hotpluggable will be forced to waste memory for all probe-only code.)

In general these broken section rules waste an average of two to four kBytes
per driver of code bloat ... because none of the relevant code can ever be
reused after module initialization.

Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2006-07-12 16:03:24 -07:00

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/*
* zero.c -- Gadget Zero, for USB development
*
* Copyright (C) 2003-2004 David Brownell
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions, and the following disclaimer,
* without modification.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The names of the above-listed copyright holders may not be used
* to endorse or promote products derived from this software without
* specific prior written permission.
*
* ALTERNATIVELY, this software may be distributed under the terms of the
* GNU General Public License ("GPL") as published by the Free Software
* Foundation, either version 2 of that License or (at your option) any
* later version.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
* IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/*
* Gadget Zero only needs two bulk endpoints, and is an example of how you
* can write a hardware-agnostic gadget driver running inside a USB device.
*
* Hardware details are visible (see CONFIG_USB_ZERO_* below) but don't
* affect most of the driver.
*
* Use it with the Linux host/master side "usbtest" driver to get a basic
* functional test of your device-side usb stack, or with "usb-skeleton".
*
* It supports two similar configurations. One sinks whatever the usb host
* writes, and in return sources zeroes. The other loops whatever the host
* writes back, so the host can read it. Module options include:
*
* buflen=N default N=4096, buffer size used
* qlen=N default N=32, how many buffers in the loopback queue
* loopdefault default false, list loopback config first
*
* Many drivers will only have one configuration, letting them be much
* simpler if they also don't support high speed operation (like this
* driver does).
*/
#define DEBUG 1
// #define VERBOSE
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/delay.h>
#include <linux/ioport.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/smp_lock.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/timer.h>
#include <linux/list.h>
#include <linux/interrupt.h>
#include <linux/utsname.h>
#include <linux/device.h>
#include <linux/moduleparam.h>
#include <asm/byteorder.h>
#include <asm/io.h>
#include <asm/irq.h>
#include <asm/system.h>
#include <asm/unaligned.h>
#include <linux/usb_ch9.h>
#include <linux/usb_gadget.h>
#include "gadget_chips.h"
/*-------------------------------------------------------------------------*/
#define DRIVER_VERSION "St Patrick's Day 2004"
static const char shortname [] = "zero";
static const char longname [] = "Gadget Zero";
static const char source_sink [] = "source and sink data";
static const char loopback [] = "loop input to output";
/*-------------------------------------------------------------------------*/
/*
* driver assumes self-powered hardware, and
* has no way for users to trigger remote wakeup.
*
* this version autoconfigures as much as possible,
* which is reasonable for most "bulk-only" drivers.
*/
static const char *EP_IN_NAME; /* source */
static const char *EP_OUT_NAME; /* sink */
/*-------------------------------------------------------------------------*/
/* big enough to hold our biggest descriptor */
#define USB_BUFSIZ 256
struct zero_dev {
spinlock_t lock;
struct usb_gadget *gadget;
struct usb_request *req; /* for control responses */
/* when configured, we have one of two configs:
* - source data (in to host) and sink it (out from host)
* - or loop it back (out from host back in to host)
*/
u8 config;
struct usb_ep *in_ep, *out_ep;
/* autoresume timer */
struct timer_list resume;
};
#define xprintk(d,level,fmt,args...) \
dev_printk(level , &(d)->gadget->dev , fmt , ## args)
#ifdef DEBUG
#define DBG(dev,fmt,args...) \
xprintk(dev , KERN_DEBUG , fmt , ## args)
#else
#define DBG(dev,fmt,args...) \
do { } while (0)
#endif /* DEBUG */
#ifdef VERBOSE
#define VDBG DBG
#else
#define VDBG(dev,fmt,args...) \
do { } while (0)
#endif /* VERBOSE */
#define ERROR(dev,fmt,args...) \
xprintk(dev , KERN_ERR , fmt , ## args)
#define WARN(dev,fmt,args...) \
xprintk(dev , KERN_WARNING , fmt , ## args)
#define INFO(dev,fmt,args...) \
xprintk(dev , KERN_INFO , fmt , ## args)
/*-------------------------------------------------------------------------*/
static unsigned buflen = 4096;
static unsigned qlen = 32;
static unsigned pattern = 0;
module_param (buflen, uint, S_IRUGO);
module_param (qlen, uint, S_IRUGO);
module_param (pattern, uint, S_IRUGO|S_IWUSR);
/*
* if it's nonzero, autoresume says how many seconds to wait
* before trying to wake up the host after suspend.
*/
static unsigned autoresume = 0;
module_param (autoresume, uint, 0);
/*
* Normally the "loopback" configuration is second (index 1) so
* it's not the default. Here's where to change that order, to
* work better with hosts where config changes are problematic.
* Or controllers (like superh) that only support one config.
*/
static int loopdefault = 0;
module_param (loopdefault, bool, S_IRUGO|S_IWUSR);
/*-------------------------------------------------------------------------*/
/* Thanks to NetChip Technologies for donating this product ID.
*
* DO NOT REUSE THESE IDs with a protocol-incompatible driver!! Ever!!
* Instead: allocate your own, using normal USB-IF procedures.
*/
#ifndef CONFIG_USB_ZERO_HNPTEST
#define DRIVER_VENDOR_NUM 0x0525 /* NetChip */
#define DRIVER_PRODUCT_NUM 0xa4a0 /* Linux-USB "Gadget Zero" */
#else
#define DRIVER_VENDOR_NUM 0x1a0a /* OTG test device IDs */
#define DRIVER_PRODUCT_NUM 0xbadd
#endif
/*-------------------------------------------------------------------------*/
/*
* DESCRIPTORS ... most are static, but strings and (full)
* configuration descriptors are built on demand.
*/
#define STRING_MANUFACTURER 25
#define STRING_PRODUCT 42
#define STRING_SERIAL 101
#define STRING_SOURCE_SINK 250
#define STRING_LOOPBACK 251
/*
* This device advertises two configurations; these numbers work
* on a pxa250 as well as more flexible hardware.
*/
#define CONFIG_SOURCE_SINK 3
#define CONFIG_LOOPBACK 2
static struct usb_device_descriptor
device_desc = {
.bLength = sizeof device_desc,
.bDescriptorType = USB_DT_DEVICE,
.bcdUSB = __constant_cpu_to_le16 (0x0200),
.bDeviceClass = USB_CLASS_VENDOR_SPEC,
.idVendor = __constant_cpu_to_le16 (DRIVER_VENDOR_NUM),
.idProduct = __constant_cpu_to_le16 (DRIVER_PRODUCT_NUM),
.iManufacturer = STRING_MANUFACTURER,
.iProduct = STRING_PRODUCT,
.iSerialNumber = STRING_SERIAL,
.bNumConfigurations = 2,
};
static struct usb_config_descriptor
source_sink_config = {
.bLength = sizeof source_sink_config,
.bDescriptorType = USB_DT_CONFIG,
/* compute wTotalLength on the fly */
.bNumInterfaces = 1,
.bConfigurationValue = CONFIG_SOURCE_SINK,
.iConfiguration = STRING_SOURCE_SINK,
.bmAttributes = USB_CONFIG_ATT_ONE | USB_CONFIG_ATT_SELFPOWER,
.bMaxPower = 1, /* self-powered */
};
static struct usb_config_descriptor
loopback_config = {
.bLength = sizeof loopback_config,
.bDescriptorType = USB_DT_CONFIG,
/* compute wTotalLength on the fly */
.bNumInterfaces = 1,
.bConfigurationValue = CONFIG_LOOPBACK,
.iConfiguration = STRING_LOOPBACK,
.bmAttributes = USB_CONFIG_ATT_ONE | USB_CONFIG_ATT_SELFPOWER,
.bMaxPower = 1, /* self-powered */
};
static struct usb_otg_descriptor
otg_descriptor = {
.bLength = sizeof otg_descriptor,
.bDescriptorType = USB_DT_OTG,
.bmAttributes = USB_OTG_SRP,
};
/* one interface in each configuration */
static const struct usb_interface_descriptor
source_sink_intf = {
.bLength = sizeof source_sink_intf,
.bDescriptorType = USB_DT_INTERFACE,
.bNumEndpoints = 2,
.bInterfaceClass = USB_CLASS_VENDOR_SPEC,
.iInterface = STRING_SOURCE_SINK,
};
static const struct usb_interface_descriptor
loopback_intf = {
.bLength = sizeof loopback_intf,
.bDescriptorType = USB_DT_INTERFACE,
.bNumEndpoints = 2,
.bInterfaceClass = USB_CLASS_VENDOR_SPEC,
.iInterface = STRING_LOOPBACK,
};
/* two full speed bulk endpoints; their use is config-dependent */
static struct usb_endpoint_descriptor
fs_source_desc = {
.bLength = USB_DT_ENDPOINT_SIZE,
.bDescriptorType = USB_DT_ENDPOINT,
.bEndpointAddress = USB_DIR_IN,
.bmAttributes = USB_ENDPOINT_XFER_BULK,
};
static struct usb_endpoint_descriptor
fs_sink_desc = {
.bLength = USB_DT_ENDPOINT_SIZE,
.bDescriptorType = USB_DT_ENDPOINT,
.bEndpointAddress = USB_DIR_OUT,
.bmAttributes = USB_ENDPOINT_XFER_BULK,
};
static const struct usb_descriptor_header *fs_source_sink_function [] = {
(struct usb_descriptor_header *) &otg_descriptor,
(struct usb_descriptor_header *) &source_sink_intf,
(struct usb_descriptor_header *) &fs_sink_desc,
(struct usb_descriptor_header *) &fs_source_desc,
NULL,
};
static const struct usb_descriptor_header *fs_loopback_function [] = {
(struct usb_descriptor_header *) &otg_descriptor,
(struct usb_descriptor_header *) &loopback_intf,
(struct usb_descriptor_header *) &fs_sink_desc,
(struct usb_descriptor_header *) &fs_source_desc,
NULL,
};
#ifdef CONFIG_USB_GADGET_DUALSPEED
/*
* usb 2.0 devices need to expose both high speed and full speed
* descriptors, unless they only run at full speed.
*
* that means alternate endpoint descriptors (bigger packets)
* and a "device qualifier" ... plus more construction options
* for the config descriptor.
*/
static struct usb_endpoint_descriptor
hs_source_desc = {
.bLength = USB_DT_ENDPOINT_SIZE,
.bDescriptorType = USB_DT_ENDPOINT,
.bmAttributes = USB_ENDPOINT_XFER_BULK,
.wMaxPacketSize = __constant_cpu_to_le16 (512),
};
static struct usb_endpoint_descriptor
hs_sink_desc = {
.bLength = USB_DT_ENDPOINT_SIZE,
.bDescriptorType = USB_DT_ENDPOINT,
.bmAttributes = USB_ENDPOINT_XFER_BULK,
.wMaxPacketSize = __constant_cpu_to_le16 (512),
};
static struct usb_qualifier_descriptor
dev_qualifier = {
.bLength = sizeof dev_qualifier,
.bDescriptorType = USB_DT_DEVICE_QUALIFIER,
.bcdUSB = __constant_cpu_to_le16 (0x0200),
.bDeviceClass = USB_CLASS_VENDOR_SPEC,
.bNumConfigurations = 2,
};
static const struct usb_descriptor_header *hs_source_sink_function [] = {
(struct usb_descriptor_header *) &otg_descriptor,
(struct usb_descriptor_header *) &source_sink_intf,
(struct usb_descriptor_header *) &hs_source_desc,
(struct usb_descriptor_header *) &hs_sink_desc,
NULL,
};
static const struct usb_descriptor_header *hs_loopback_function [] = {
(struct usb_descriptor_header *) &otg_descriptor,
(struct usb_descriptor_header *) &loopback_intf,
(struct usb_descriptor_header *) &hs_source_desc,
(struct usb_descriptor_header *) &hs_sink_desc,
NULL,
};
/* maxpacket and other transfer characteristics vary by speed. */
#define ep_desc(g,hs,fs) (((g)->speed==USB_SPEED_HIGH)?(hs):(fs))
#else
/* if there's no high speed support, maxpacket doesn't change. */
#define ep_desc(g,hs,fs) fs
#endif /* !CONFIG_USB_GADGET_DUALSPEED */
static char manufacturer [50];
static char serial [40];
/* static strings, in UTF-8 */
static struct usb_string strings [] = {
{ STRING_MANUFACTURER, manufacturer, },
{ STRING_PRODUCT, longname, },
{ STRING_SERIAL, serial, },
{ STRING_LOOPBACK, loopback, },
{ STRING_SOURCE_SINK, source_sink, },
{ } /* end of list */
};
static struct usb_gadget_strings stringtab = {
.language = 0x0409, /* en-us */
.strings = strings,
};
/*
* config descriptors are also handcrafted. these must agree with code
* that sets configurations, and with code managing interfaces and their
* altsettings. other complexity may come from:
*
* - high speed support, including "other speed config" rules
* - multiple configurations
* - interfaces with alternate settings
* - embedded class or vendor-specific descriptors
*
* this handles high speed, and has a second config that could as easily
* have been an alternate interface setting (on most hardware).
*
* NOTE: to demonstrate (and test) more USB capabilities, this driver
* should include an altsetting to test interrupt transfers, including
* high bandwidth modes at high speed. (Maybe work like Intel's test
* device?)
*/
static int
config_buf (struct usb_gadget *gadget,
u8 *buf, u8 type, unsigned index)
{
int is_source_sink;
int len;
const struct usb_descriptor_header **function;
#ifdef CONFIG_USB_GADGET_DUALSPEED
int hs = (gadget->speed == USB_SPEED_HIGH);
#endif
/* two configurations will always be index 0 and index 1 */
if (index > 1)
return -EINVAL;
is_source_sink = loopdefault ? (index == 1) : (index == 0);
#ifdef CONFIG_USB_GADGET_DUALSPEED
if (type == USB_DT_OTHER_SPEED_CONFIG)
hs = !hs;
if (hs)
function = is_source_sink
? hs_source_sink_function
: hs_loopback_function;
else
#endif
function = is_source_sink
? fs_source_sink_function
: fs_loopback_function;
/* for now, don't advertise srp-only devices */
if (!gadget->is_otg)
function++;
len = usb_gadget_config_buf (is_source_sink
? &source_sink_config
: &loopback_config,
buf, USB_BUFSIZ, function);
if (len < 0)
return len;
((struct usb_config_descriptor *) buf)->bDescriptorType = type;
return len;
}
/*-------------------------------------------------------------------------*/
static struct usb_request *
alloc_ep_req (struct usb_ep *ep, unsigned length)
{
struct usb_request *req;
req = usb_ep_alloc_request (ep, GFP_ATOMIC);
if (req) {
req->length = length;
req->buf = usb_ep_alloc_buffer (ep, length,
&req->dma, GFP_ATOMIC);
if (!req->buf) {
usb_ep_free_request (ep, req);
req = NULL;
}
}
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);
usb_ep_free_request (ep, req);
}
/*-------------------------------------------------------------------------*/
/* 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",
system_utsname.sysname, system_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);
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