linux/drivers/usb/gadget/zero.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

364 lines
9.9 KiB
C

/*
* zero.c -- Gadget Zero, for USB development
*
* 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
*/
/*
* 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.
* Some hardware details are visible, 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.
*
* 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).
*
* Why is *this* driver using two configurations, rather than setting up
* two interfaces with different functions? To help verify that multiple
* configuration infrastucture is working correctly; also, so that it can
* work with low capability USB controllers without four bulk endpoints.
*/
/*
* driver assumes self-powered hardware, and
* has no way for users to trigger remote wakeup.
*/
/* #define VERBOSE_DEBUG */
#include <linux/kernel.h>
#include <linux/utsname.h>
#include <linux/device.h>
#include "g_zero.h"
#include "gadget_chips.h"
/*-------------------------------------------------------------------------*/
/*
* Kbuild is not very cooperative with respect to linking separately
* compiled library objects into one module. So for now we won't use
* separate compilation ... ensuring init/exit sections work to shrink
* the runtime footprint, and giving us at least some parts of what
* a "gcc --combine ... part1.c part2.c part3.c ... " build would.
*/
#include "composite.c"
#include "usbstring.c"
#include "config.c"
#include "epautoconf.c"
#include "f_sourcesink.c"
#include "f_loopback.c"
/*-------------------------------------------------------------------------*/
#define DRIVER_VERSION "Cinco de Mayo 2008"
static const char longname[] = "Gadget Zero";
unsigned buflen = 4096;
module_param(buflen, 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 original 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" */
#define DEFAULT_AUTORESUME 0
#else
#define DRIVER_VENDOR_NUM 0x1a0a /* OTG test device IDs */
#define DRIVER_PRODUCT_NUM 0xbadd
#define DEFAULT_AUTORESUME 5
#endif
/* If the optional "autoresume" mode is enabled, it provides good
* functional coverage for the "USBCV" test harness from USB-IF.
* It's always set if OTG mode is enabled.
*/
unsigned autoresume = DEFAULT_AUTORESUME;
module_param(autoresume, uint, S_IRUGO);
MODULE_PARM_DESC(autoresume, "zero, or seconds before remote wakeup");
/*-------------------------------------------------------------------------*/
static struct usb_device_descriptor device_desc = {
.bLength = sizeof device_desc,
.bDescriptorType = USB_DT_DEVICE,
.bcdUSB = cpu_to_le16(0x0200),
.bDeviceClass = USB_CLASS_VENDOR_SPEC,
.idVendor = cpu_to_le16(DRIVER_VENDOR_NUM),
.idProduct = cpu_to_le16(DRIVER_PRODUCT_NUM),
.bNumConfigurations = 2,
};
#ifdef CONFIG_USB_OTG
static struct usb_otg_descriptor otg_descriptor = {
.bLength = sizeof otg_descriptor,
.bDescriptorType = USB_DT_OTG,
/* REVISIT SRP-only hardware is possible, although
* it would not be called "OTG" ...
*/
.bmAttributes = USB_OTG_SRP | USB_OTG_HNP,
};
const struct usb_descriptor_header *otg_desc[] = {
(struct usb_descriptor_header *) &otg_descriptor,
NULL,
};
#endif
/* string IDs are assigned dynamically */
#define STRING_MANUFACTURER_IDX 0
#define STRING_PRODUCT_IDX 1
#define STRING_SERIAL_IDX 2
static char manufacturer[50];
/* default serial number takes at least two packets */
static char serial[] = "0123456789.0123456789.0123456789";
static struct usb_string strings_dev[] = {
[STRING_MANUFACTURER_IDX].s = manufacturer,
[STRING_PRODUCT_IDX].s = longname,
[STRING_SERIAL_IDX].s = serial,
{ } /* end of list */
};
static struct usb_gadget_strings stringtab_dev = {
.language = 0x0409, /* en-us */
.strings = strings_dev,
};
static struct usb_gadget_strings *dev_strings[] = {
&stringtab_dev,
NULL,
};
/*-------------------------------------------------------------------------*/
struct usb_request *alloc_ep_req(struct usb_ep *ep)
{
struct usb_request *req;
req = usb_ep_alloc_request(ep, GFP_ATOMIC);
if (req) {
req->length = buflen;
req->buf = kmalloc(buflen, GFP_ATOMIC);
if (!req->buf) {
usb_ep_free_request(ep, req);
req = NULL;
}
}
return req;
}
void free_ep_req(struct usb_ep *ep, struct usb_request *req)
{
kfree(req->buf);
usb_ep_free_request(ep, req);
}
static void disable_ep(struct usb_composite_dev *cdev, struct usb_ep *ep)
{
int value;
if (ep->driver_data) {
value = usb_ep_disable(ep);
if (value < 0)
DBG(cdev, "disable %s --> %d\n",
ep->name, value);
ep->driver_data = NULL;
}
}
void disable_endpoints(struct usb_composite_dev *cdev,
struct usb_ep *in, struct usb_ep *out)
{
disable_ep(cdev, in);
disable_ep(cdev, out);
}
/*-------------------------------------------------------------------------*/
static struct timer_list autoresume_timer;
static void zero_autoresume(unsigned long _c)
{
struct usb_composite_dev *cdev = (void *)_c;
struct usb_gadget *g = cdev->gadget;
/* unconfigured devices can't issue wakeups */
if (!cdev->config)
return;
/* Normally the host would be woken up for something
* more significant than just a timer firing; likely
* because of some direct user request.
*/
if (g->speed != USB_SPEED_UNKNOWN) {
int status = usb_gadget_wakeup(g);
INFO(cdev, "%s --> %d\n", __func__, status);
}
}
static void zero_suspend(struct usb_composite_dev *cdev)
{
if (cdev->gadget->speed == USB_SPEED_UNKNOWN)
return;
if (autoresume) {
mod_timer(&autoresume_timer, jiffies + (HZ * autoresume));
DBG(cdev, "suspend, wakeup in %d seconds\n", autoresume);
} else
DBG(cdev, "%s\n", __func__);
}
static void zero_resume(struct usb_composite_dev *cdev)
{
DBG(cdev, "%s\n", __func__);
del_timer(&autoresume_timer);
}
/*-------------------------------------------------------------------------*/
static int __init zero_bind(struct usb_composite_dev *cdev)
{
int gcnum;
struct usb_gadget *gadget = cdev->gadget;
int id;
/* Allocate string descriptor numbers ... note that string
* contents can be overridden by the composite_dev glue.
*/
id = usb_string_id(cdev);
if (id < 0)
return id;
strings_dev[STRING_MANUFACTURER_IDX].id = id;
device_desc.iManufacturer = id;
id = usb_string_id(cdev);
if (id < 0)
return id;
strings_dev[STRING_PRODUCT_IDX].id = id;
device_desc.iProduct = id;
id = usb_string_id(cdev);
if (id < 0)
return id;
strings_dev[STRING_SERIAL_IDX].id = id;
device_desc.iSerialNumber = id;
setup_timer(&autoresume_timer, zero_autoresume, (unsigned long) cdev);
/* Register primary, then secondary configuration. Note that
* SH3 only allows one config...
*/
if (loopdefault) {
loopback_add(cdev, autoresume != 0);
if (!gadget_is_sh(gadget))
sourcesink_add(cdev, autoresume != 0);
} else {
sourcesink_add(cdev, autoresume != 0);
if (!gadget_is_sh(gadget))
loopback_add(cdev, autoresume != 0);
}
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 just warn about unrcognized controllers -- don't panic.
*
* things like configuration and altsetting numbering
* can need hardware-specific attention though.
*/
pr_warning("%s: controller '%s' not recognized\n",
longname, gadget->name);
device_desc.bcdDevice = cpu_to_le16(0x9999);
}
INFO(cdev, "%s, version: " DRIVER_VERSION "\n", longname);
snprintf(manufacturer, sizeof manufacturer, "%s %s with %s",
init_utsname()->sysname, init_utsname()->release,
gadget->name);
return 0;
}
static int zero_unbind(struct usb_composite_dev *cdev)
{
del_timer_sync(&autoresume_timer);
return 0;
}
static struct usb_composite_driver zero_driver = {
.name = "zero",
.dev = &device_desc,
.strings = dev_strings,
.bind = zero_bind,
.unbind = zero_unbind,
.suspend = zero_suspend,
.resume = zero_resume,
};
MODULE_AUTHOR("David Brownell");
MODULE_LICENSE("GPL");
static int __init init(void)
{
return usb_composite_register(&zero_driver);
}
module_init(init);
static void __exit cleanup(void)
{
usb_composite_unregister(&zero_driver);
}
module_exit(cleanup);