// SPDX-License-Identifier: GPL-2.0+
/*
* zero.c -- Gadget Zero, for USB development
*
* Copyright (C) 2003-2008 David Brownell
* Copyright (C) 2008 by Nokia Corporation
*/
/*
* 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 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 infrastructure 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/slab.h>
#include <linux/device.h>
#include <linux/module.h>
#include <linux/err.h>
#include <linux/usb/composite.h>
#include "g_zero.h"
/*-------------------------------------------------------------------------*/
USB_GADGET_COMPOSITE_OPTIONS();
#define DRIVER_VERSION "Cinco de Mayo 2008"
static const char longname[] = "Gadget Zero";
/*
* 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 bool loopdefault = 0;
module_param(loopdefault, bool, S_IRUGO|S_IWUSR);
static struct usb_zero_options gzero_options = {
.isoc_interval = GZERO_ISOC_INTERVAL,
.isoc_maxpacket = GZERO_ISOC_MAXPACKET,
.bulk_buflen = GZERO_BULK_BUFLEN,
.qlen = GZERO_QLEN,
.ss_bulk_qlen = GZERO_SS_BULK_QLEN,
.ss_iso_qlen = GZERO_SS_ISO_QLEN,
};
/*-------------------------------------------------------------------------*/
/* 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.
*/
static unsigned autoresume = DEFAULT_AUTORESUME;
module_param(autoresume, uint, S_IRUGO);
MODULE_PARM_DESC(autoresume, "zero, or seconds before remote wakeup");
/* Maximum Autoresume time */
static unsigned max_autoresume;
module_param(max_autoresume, uint, S_IRUGO);
MODULE_PARM_DESC(max_autoresume, "maximum seconds before remote wakeup");
/* Interval between two remote wakeups */
static unsigned autoresume_interval_ms;
module_param(autoresume_interval_ms, uint, S_IRUGO);
MODULE_PARM_DESC(autoresume_interval_ms,
"milliseconds to increase successive wakeup delays");
static unsigned autoresume_step_ms;
/*-------------------------------------------------------------------------*/
static struct usb_device_descriptor device_desc = {
.bLength = sizeof device_desc,
.bDescriptorType = USB_DT_DEVICE,
/* .bcdUSB = DYNAMIC */
.bDeviceClass = USB_CLASS_VENDOR_SPEC,
.idVendor = cpu_to_le16(DRIVER_VENDOR_NUM),
.idProduct = cpu_to_le16(DRIVER_PRODUCT_NUM),
.bNumConfigurations = 2,
};
static const struct usb_descriptor_header *otg_desc[2];
/* string IDs are assigned dynamically */
/* default serial number takes at least two packets */
static char serial[] = "0123456789.0123456789.0123456789";
#define USB_GZERO_SS_DESC (USB_GADGET_FIRST_AVAIL_IDX + 0)
#define USB_GZERO_LB_DESC (USB_GADGET_FIRST_AVAIL_IDX + 1)
static struct usb_string strings_dev[] = {
[USB_GADGET_MANUFACTURER_IDX].s = "",
[USB_GADGET_PRODUCT_IDX].s = longname,
[USB_GADGET_SERIAL_IDX].s = serial,
[USB_GZERO_SS_DESC].s = "source and sink data",
[USB_GZERO_LB_DESC].s = "loop input to output",
{ } /* 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,
};
/*-------------------------------------------------------------------------*/
static struct timer_list autoresume_timer;
static struct usb_composite_dev *autoresume_cdev;
static void zero_autoresume(struct timer_list *unused)
{
struct usb_composite_dev *cdev = autoresume_cdev;
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) {
if (max_autoresume &&
(autoresume_step_ms > max_autoresume * 1000))
autoresume_step_ms = autoresume * 1000;
mod_timer(&autoresume_timer, jiffies +
msecs_to_jiffies(autoresume_step_ms));
DBG(cdev, "suspend, wakeup in %d milliseconds\n",
autoresume_step_ms);
autoresume_step_ms += autoresume_interval_ms;
} 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 struct usb_configuration loopback_driver = {
.label = "loopback",
.bConfigurationValue = 2,
.bmAttributes = USB_CONFIG_ATT_SELFPOWER,
/* .iConfiguration = DYNAMIC */
};
static struct usb_function *func_ss;
static struct usb_function_instance *func_inst_ss;
static int ss_config_setup(struct usb_configuration *c,
const struct usb_ctrlrequest *ctrl)
{
switch (ctrl->bRequest) {
case 0x5b:
case 0x5c:
return func_ss->setup(func_ss, ctrl);
default:
return -EOPNOTSUPP;
}
}
static struct usb_configuration sourcesink_driver = {
.label = "source/sink",
.setup = ss_config_setup,
.bConfigurationValue = 3,
.bmAttributes = USB_CONFIG_ATT_SELFPOWER,
/* .iConfiguration = DYNAMIC */
};
module_param_named(buflen, gzero_options.bulk_buflen, uint, 0);
module_param_named(pattern, gzero_options.pattern, uint, S_IRUGO|S_IWUSR);
MODULE_PARM_DESC(pattern, "0 = all zeroes, 1 = mod63, 2 = none");
module_param_named(isoc_interval, gzero_options.isoc_interval, uint,
S_IRUGO|S_IWUSR);
MODULE_PARM_DESC(isoc_interval, "1 - 16");
module_param_named(isoc_maxpacket, gzero_options.isoc_maxpacket, uint,
S_IRUGO|S_IWUSR);
MODULE_PARM_DESC(isoc_maxpacket, "0 - 1023 (fs), 0 - 1024 (hs/ss)");
module_param_named(isoc_mult, gzero_options.isoc_mult, uint, S_IRUGO|S_IWUSR);
MODULE_PARM_DESC(isoc_mult, "0 - 2 (hs/ss only)");
module_param_named(isoc_maxburst, gzero_options.isoc_maxburst, uint,
S_IRUGO|S_IWUSR);
MODULE_PARM_DESC(isoc_maxburst, "0 - 15 (ss only)");
static struct usb_function *func_lb;
static struct usb_function_instance *func_inst_lb;
module_param_named(qlen, gzero_options.qlen, uint, S_IRUGO|S_IWUSR);
MODULE_PARM_DESC(qlen, "depth of loopback queue");
module_param_named(ss_bulk_qlen, gzero_options.ss_bulk_qlen, uint,
S_IRUGO|S_IWUSR);
MODULE_PARM_DESC(bulk_qlen, "depth of sourcesink queue for bulk transfer");
module_param_named(ss_iso_qlen, gzero_options.ss_iso_qlen, uint,
S_IRUGO|S_IWUSR);
MODULE_PARM_DESC(iso_qlen, "depth of sourcesink queue for iso transfer");
static int zero_bind(struct usb_composite_dev *cdev)
{
struct f_ss_opts *ss_opts;
struct f_lb_opts *lb_opts;
int status;
/* Allocate string descriptor numbers ... note that string
* contents can be overridden by the composite_dev glue.
*/
status = usb_string_ids_tab(cdev, strings_dev);
if (status < 0)
return status;
device_desc.iManufacturer = strings_dev[USB_GADGET_MANUFACTURER_IDX].id;
device_desc.iProduct = strings_dev[USB_GADGET_PRODUCT_IDX].id;
device_desc.iSerialNumber = strings_dev[USB_GADGET_SERIAL_IDX].id;
autoresume_cdev = cdev;
timer_setup(&autoresume_timer, zero_autoresume, 0);
func_inst_ss = usb_get_function_instance("SourceSink");
if (IS_ERR(func_inst_ss))
return PTR_ERR(func_inst_ss);
ss_opts = container_of(func_inst_ss, struct f_ss_opts, func_inst);
ss_opts->pattern = gzero_options.pattern;
ss_opts->isoc_interval = gzero_options.isoc_interval;
ss_opts->isoc_maxpacket = gzero_options.isoc_maxpacket;
ss_opts->isoc_mult = gzero_options.isoc_mult;
ss_opts->isoc_maxburst = gzero_options.isoc_maxburst;
ss_opts->bulk_buflen = gzero_options.bulk_buflen;
ss_opts->bulk_qlen = gzero_options.ss_bulk_qlen;
ss_opts->iso_qlen = gzero_options.ss_iso_qlen;
func_ss = usb_get_function(func_inst_ss);
if (IS_ERR(func_ss)) {
status = PTR_ERR(func_ss);
goto err_put_func_inst_ss;
}
func_inst_lb = usb_get_function_instance("Loopback");
if (IS_ERR(func_inst_lb)) {
status = PTR_ERR(func_inst_lb);
goto err_put_func_ss;
}
lb_opts = container_of(func_inst_lb, struct f_lb_opts, func_inst);
lb_opts->bulk_buflen = gzero_options.bulk_buflen;
lb_opts->qlen = gzero_options.qlen;
func_lb = usb_get_function(func_inst_lb);
if (IS_ERR(func_lb)) {
status = PTR_ERR(func_lb);
goto err_put_func_inst_lb;
}
sourcesink_driver.iConfiguration = strings_dev[USB_GZERO_SS_DESC].id;
loopback_driver.iConfiguration = strings_dev[USB_GZERO_LB_DESC].id;
/* support autoresume for remote wakeup testing */
sourcesink_driver.bmAttributes &= ~USB_CONFIG_ATT_WAKEUP;
loopback_driver.bmAttributes &= ~USB_CONFIG_ATT_WAKEUP;
sourcesink_driver.descriptors = NULL;
loopback_driver.descriptors = NULL;
if (autoresume) {
sourcesink_driver.bmAttributes |= USB_CONFIG_ATT_WAKEUP;
loopback_driver.bmAttributes |= USB_CONFIG_ATT_WAKEUP;
autoresume_step_ms = autoresume * 1000;
}
/* support OTG systems */
if (gadget_is_otg(cdev->gadget)) {
if (!otg_desc[0]) {
struct usb_descriptor_header *usb_desc;
usb_desc = usb_otg_descriptor_alloc(cdev->gadget);
if (!usb_desc) {
status = -ENOMEM;
goto err_conf_flb;
}
usb_otg_descriptor_init(cdev->gadget, usb_desc);
otg_desc[0] = usb_desc;
otg_desc[1] = NULL;
}
sourcesink_driver.descriptors = otg_desc;
sourcesink_driver.bmAttributes |= USB_CONFIG_ATT_WAKEUP;
loopback_driver.descriptors = otg_desc;
loopback_driver.bmAttributes |= USB_CONFIG_ATT_WAKEUP;
}
/* Register primary, then secondary configuration. Note that
* SH3 only allows one config...
*/
if (loopdefault) {
usb_add_config_only(cdev, &loopback_driver);
usb_add_config_only(cdev, &sourcesink_driver);
} else {
usb_add_config_only(cdev, &sourcesink_driver);
usb_add_config_only(cdev, &loopback_driver);
}
status = usb_add_function(&sourcesink_driver, func_ss);
if (status)
goto err_free_otg_desc;
usb_ep_autoconfig_reset(cdev->gadget);
status = usb_add_function(&loopback_driver, func_lb);
if (status)
goto err_free_otg_desc;
usb_ep_autoconfig_reset(cdev->gadget);
usb_composite_overwrite_options(cdev, &coverwrite);
INFO(cdev, "%s, version: " DRIVER_VERSION "\n", longname);
return 0;
err_free_otg_desc:
kfree(otg_desc[0]);
otg_desc[0] = NULL;
err_conf_flb:
usb_put_function(func_lb);
func_lb = NULL;
err_put_func_inst_lb:
usb_put_function_instance(func_inst_lb);
func_inst_lb = NULL;
err_put_func_ss:
usb_put_function(func_ss);
func_ss = NULL;
err_put_func_inst_ss:
usb_put_function_instance(func_inst_ss);
func_inst_ss = NULL;
return status;
}
static int zero_unbind(struct usb_composite_dev *cdev)
{
del_timer_sync(&autoresume_timer);
if (!IS_ERR_OR_NULL(func_ss))
usb_put_function(func_ss);
usb_put_function_instance(func_inst_ss);
if (!IS_ERR_OR_NULL(func_lb))
usb_put_function(func_lb);
usb_put_function_instance(func_inst_lb);
kfree(otg_desc[0]);
otg_desc[0] = NULL;
return 0;
}
static struct usb_composite_driver zero_driver = {
.name = "zero",
.dev = &device_desc,
.strings = dev_strings,
.max_speed = USB_SPEED_SUPER,
.bind = zero_bind,
.unbind = zero_unbind,
.suspend = zero_suspend,
.resume = zero_resume,
};
module_usb_composite_driver(zero_driver);
MODULE_AUTHOR("David Brownell");
MODULE_DESCRIPTION("Gadget Zero, for USB development");
MODULE_LICENSE("GPL");
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