linux/drivers/usb/gadget/f_loopback.c
David Brownell ab943a2e12 USB: gadget: gadget zero uses new suspend/resume hooks
Use the new device-level suspend/resume hooks for Gadget Zero;
always enable them with the OTG test mode; and support remote
wakeup on both configurations even in non-OTG mode.

This ensures that both configurations can pass the USBCV remote
wakeup tests when the OTG test mode is enabled.  This changes
behavior by adding autoresume support to the loopback config
even in non-OTG mode; the test failure was that it didn't work
in OTG mode.

Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2009-03-24 16:20:45 -07:00

386 lines
10 KiB
C

/*
* f_loopback.c - USB peripheral loopback configuration driver
*
* Copyright (C) 2003-2008 David Brownell
* Copyright (C) 2008 by Nokia Corporation
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/* #define VERBOSE_DEBUG */
#include <linux/kernel.h>
#include <linux/utsname.h>
#include <linux/device.h>
#include "g_zero.h"
#include "gadget_chips.h"
/*
* LOOPBACK FUNCTION ... a testing vehicle for USB peripherals,
*
* This takes messages of various sizes written OUT to a device, and loops
* them back so they can be read IN from it. It has been used by certain
* test applications. It supports limited testing of data queueing logic.
*
*
* This is currently packaged as a configuration driver, which can't be
* combined with other functions to make composite devices. However, it
* can be combined with other independent configurations.
*/
struct f_loopback {
struct usb_function function;
struct usb_ep *in_ep;
struct usb_ep *out_ep;
};
static inline struct f_loopback *func_to_loop(struct usb_function *f)
{
return container_of(f, struct f_loopback, function);
}
static unsigned qlen = 32;
module_param(qlen, uint, 0);
MODULE_PARM_DESC(qlenn, "depth of loopback queue");
/*-------------------------------------------------------------------------*/
static struct usb_interface_descriptor loopback_intf = {
.bLength = sizeof loopback_intf,
.bDescriptorType = USB_DT_INTERFACE,
.bNumEndpoints = 2,
.bInterfaceClass = USB_CLASS_VENDOR_SPEC,
/* .iInterface = DYNAMIC */
};
/* full speed support: */
static struct usb_endpoint_descriptor fs_loop_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_loop_sink_desc = {
.bLength = USB_DT_ENDPOINT_SIZE,
.bDescriptorType = USB_DT_ENDPOINT,
.bEndpointAddress = USB_DIR_OUT,
.bmAttributes = USB_ENDPOINT_XFER_BULK,
};
static struct usb_descriptor_header *fs_loopback_descs[] = {
(struct usb_descriptor_header *) &loopback_intf,
(struct usb_descriptor_header *) &fs_loop_sink_desc,
(struct usb_descriptor_header *) &fs_loop_source_desc,
NULL,
};
/* high speed support: */
static struct usb_endpoint_descriptor hs_loop_source_desc = {
.bLength = USB_DT_ENDPOINT_SIZE,
.bDescriptorType = USB_DT_ENDPOINT,
.bmAttributes = USB_ENDPOINT_XFER_BULK,
.wMaxPacketSize = cpu_to_le16(512),
};
static struct usb_endpoint_descriptor hs_loop_sink_desc = {
.bLength = USB_DT_ENDPOINT_SIZE,
.bDescriptorType = USB_DT_ENDPOINT,
.bmAttributes = USB_ENDPOINT_XFER_BULK,
.wMaxPacketSize = cpu_to_le16(512),
};
static struct usb_descriptor_header *hs_loopback_descs[] = {
(struct usb_descriptor_header *) &loopback_intf,
(struct usb_descriptor_header *) &hs_loop_source_desc,
(struct usb_descriptor_header *) &hs_loop_sink_desc,
NULL,
};
/* function-specific strings: */
static struct usb_string strings_loopback[] = {
[0].s = "loop input to output",
{ } /* end of list */
};
static struct usb_gadget_strings stringtab_loop = {
.language = 0x0409, /* en-us */
.strings = strings_loopback,
};
static struct usb_gadget_strings *loopback_strings[] = {
&stringtab_loop,
NULL,
};
/*-------------------------------------------------------------------------*/
static int __init
loopback_bind(struct usb_configuration *c, struct usb_function *f)
{
struct usb_composite_dev *cdev = c->cdev;
struct f_loopback *loop = func_to_loop(f);
int id;
/* allocate interface ID(s) */
id = usb_interface_id(c, f);
if (id < 0)
return id;
loopback_intf.bInterfaceNumber = id;
/* allocate endpoints */
loop->in_ep = usb_ep_autoconfig(cdev->gadget, &fs_loop_source_desc);
if (!loop->in_ep) {
autoconf_fail:
ERROR(cdev, "%s: can't autoconfigure on %s\n",
f->name, cdev->gadget->name);
return -ENODEV;
}
loop->in_ep->driver_data = cdev; /* claim */
loop->out_ep = usb_ep_autoconfig(cdev->gadget, &fs_loop_sink_desc);
if (!loop->out_ep)
goto autoconf_fail;
loop->out_ep->driver_data = cdev; /* claim */
/* support high speed hardware */
if (gadget_is_dualspeed(c->cdev->gadget)) {
hs_loop_source_desc.bEndpointAddress =
fs_loop_source_desc.bEndpointAddress;
hs_loop_sink_desc.bEndpointAddress =
fs_loop_sink_desc.bEndpointAddress;
f->hs_descriptors = hs_loopback_descs;
}
DBG(cdev, "%s speed %s: IN/%s, OUT/%s\n",
gadget_is_dualspeed(c->cdev->gadget) ? "dual" : "full",
f->name, loop->in_ep->name, loop->out_ep->name);
return 0;
}
static void
loopback_unbind(struct usb_configuration *c, struct usb_function *f)
{
kfree(func_to_loop(f));
}
static void loopback_complete(struct usb_ep *ep, struct usb_request *req)
{
struct f_loopback *loop = ep->driver_data;
struct usb_composite_dev *cdev = loop->function.config->cdev;
int status = req->status;
switch (status) {
case 0: /* normal completion? */
if (ep == loop->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(loop->in_ep, req, GFP_ATOMIC);
if (status == 0)
return;
/* "should never get here" */
ERROR(cdev, "can't loop %s to %s: %d\n",
ep->name, loop->in_ep->name,
status);
}
/* queue the buffer for some later OUT packet */
req->length = buflen;
status = usb_ep_queue(loop->out_ep, req, GFP_ATOMIC);
if (status == 0)
return;
/* "should never get here" */
/* FALLTHROUGH */
default:
ERROR(cdev, "%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 void disable_loopback(struct f_loopback *loop)
{
struct usb_composite_dev *cdev;
cdev = loop->function.config->cdev;
disable_endpoints(cdev, loop->in_ep, loop->out_ep);
VDBG(cdev, "%s disabled\n", loop->function.name);
}
static int
enable_loopback(struct usb_composite_dev *cdev, struct f_loopback *loop)
{
int result = 0;
const struct usb_endpoint_descriptor *src, *sink;
struct usb_ep *ep;
struct usb_request *req;
unsigned i;
src = ep_choose(cdev->gadget,
&hs_loop_source_desc, &fs_loop_source_desc);
sink = ep_choose(cdev->gadget,
&hs_loop_sink_desc, &fs_loop_sink_desc);
/* one endpoint writes data back IN to the host */
ep = loop->in_ep;
result = usb_ep_enable(ep, src);
if (result < 0)
return result;
ep->driver_data = loop;
/* one endpoint just reads OUT packets */
ep = loop->out_ep;
result = usb_ep_enable(ep, sink);
if (result < 0) {
fail0:
ep = loop->in_ep;
usb_ep_disable(ep);
ep->driver_data = NULL;
return result;
}
ep->driver_data = loop;
/* 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.
*/
for (i = 0; i < qlen && result == 0; i++) {
req = alloc_ep_req(ep);
if (req) {
req->complete = loopback_complete;
result = usb_ep_queue(ep, req, GFP_ATOMIC);
if (result)
ERROR(cdev, "%s queue req --> %d\n",
ep->name, result);
} else {
usb_ep_disable(ep);
ep->driver_data = NULL;
result = -ENOMEM;
goto fail0;
}
}
DBG(cdev, "%s enabled\n", loop->function.name);
return result;
}
static int loopback_set_alt(struct usb_function *f,
unsigned intf, unsigned alt)
{
struct f_loopback *loop = func_to_loop(f);
struct usb_composite_dev *cdev = f->config->cdev;
/* we know alt is zero */
if (loop->in_ep->driver_data)
disable_loopback(loop);
return enable_loopback(cdev, loop);
}
static void loopback_disable(struct usb_function *f)
{
struct f_loopback *loop = func_to_loop(f);
disable_loopback(loop);
}
/*-------------------------------------------------------------------------*/
static int __init loopback_bind_config(struct usb_configuration *c)
{
struct f_loopback *loop;
int status;
loop = kzalloc(sizeof *loop, GFP_KERNEL);
if (!loop)
return -ENOMEM;
loop->function.name = "loopback";
loop->function.descriptors = fs_loopback_descs;
loop->function.bind = loopback_bind;
loop->function.unbind = loopback_unbind;
loop->function.set_alt = loopback_set_alt;
loop->function.disable = loopback_disable;
status = usb_add_function(c, &loop->function);
if (status)
kfree(loop);
return status;
}
static struct usb_configuration loopback_driver = {
.label = "loopback",
.strings = loopback_strings,
.bind = loopback_bind_config,
.bConfigurationValue = 2,
.bmAttributes = USB_CONFIG_ATT_SELFPOWER,
/* .iConfiguration = DYNAMIC */
};
/**
* loopback_add - add a loopback testing configuration to a device
* @cdev: the device to support the loopback configuration
*/
int __init loopback_add(struct usb_composite_dev *cdev, bool autoresume)
{
int id;
/* allocate string ID(s) */
id = usb_string_id(cdev);
if (id < 0)
return id;
strings_loopback[0].id = id;
loopback_intf.iInterface = id;
loopback_driver.iConfiguration = id;
/* support autoresume for remote wakeup testing */
if (autoresume)
sourcesink_driver.bmAttributes |= USB_CONFIG_ATT_WAKEUP;
/* support OTG systems */
if (gadget_is_otg(cdev->gadget)) {
loopback_driver.descriptors = otg_desc;
loopback_driver.bmAttributes |= USB_CONFIG_ATT_WAKEUP;
}
return usb_add_config(cdev, &loopback_driver);
}