599 lines
14 KiB
C
599 lines
14 KiB
C
|
// SPDX-License-Identifier: GPL-2.0+
|
||
|
|
/*
|
||
|
|
* f_loopback.c - USB peripheral loopback configuration driver
|
||
|
|
*
|
||
|
|
* Copyright (C) 2003-2008 David Brownell
|
||
|
|
* Copyright (C) 2008 by Nokia Corporation
|
||
|
|
*/
|
||
|
|
|
||
|
|
/* #define VERBOSE_DEBUG */
|
||
|
|
|
||
|
|
#include <linux/slab.h>
|
||
|
|
#include <linux/kernel.h>
|
||
|
|
#include <linux/device.h>
|
||
|
|
#include <linux/module.h>
|
||
|
|
#include <linux/err.h>
|
||
|
|
#include <linux/usb/composite.h>
|
||
|
|
|
||
|
|
#include "g_zero.h"
|
||
|
|
#include "u_f.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.
|
||
|
|
*/
|
||
|
|
struct f_loopback {
|
||
|
|
struct usb_function function;
|
||
|
|
|
||
|
|
struct usb_ep *in_ep;
|
||
|
|
struct usb_ep *out_ep;
|
||
|
|
|
||
|
|
unsigned qlen;
|
||
|
|
unsigned buflen;
|
||
|
|
};
|
||
|
|
|
||
|
|
static inline struct f_loopback *func_to_loop(struct usb_function *f)
|
||
|
|
{
|
||
|
|
return container_of(f, struct f_loopback, function);
|
||
|
|
}
|
||
|
|
|
||
|
|
/*-------------------------------------------------------------------------*/
|
||
|
|
|
||
|
|
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,
|
||
|
|
};
|
||
|
|
|
||
|
|
/* super speed support: */
|
||
|
|
|
||
|
|
static struct usb_endpoint_descriptor ss_loop_source_desc = {
|
||
|
|
.bLength = USB_DT_ENDPOINT_SIZE,
|
||
|
|
.bDescriptorType = USB_DT_ENDPOINT,
|
||
|
|
|
||
|
|
.bmAttributes = USB_ENDPOINT_XFER_BULK,
|
||
|
|
.wMaxPacketSize = cpu_to_le16(1024),
|
||
|
|
};
|
||
|
|
|
||
|
|
static struct usb_ss_ep_comp_descriptor ss_loop_source_comp_desc = {
|
||
|
|
.bLength = USB_DT_SS_EP_COMP_SIZE,
|
||
|
|
.bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
|
||
|
|
.bMaxBurst = 0,
|
||
|
|
.bmAttributes = 0,
|
||
|
|
.wBytesPerInterval = 0,
|
||
|
|
};
|
||
|
|
|
||
|
|
static struct usb_endpoint_descriptor ss_loop_sink_desc = {
|
||
|
|
.bLength = USB_DT_ENDPOINT_SIZE,
|
||
|
|
.bDescriptorType = USB_DT_ENDPOINT,
|
||
|
|
|
||
|
|
.bmAttributes = USB_ENDPOINT_XFER_BULK,
|
||
|
|
.wMaxPacketSize = cpu_to_le16(1024),
|
||
|
|
};
|
||
|
|
|
||
|
|
static struct usb_ss_ep_comp_descriptor ss_loop_sink_comp_desc = {
|
||
|
|
.bLength = USB_DT_SS_EP_COMP_SIZE,
|
||
|
|
.bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
|
||
|
|
.bMaxBurst = 0,
|
||
|
|
.bmAttributes = 0,
|
||
|
|
.wBytesPerInterval = 0,
|
||
|
|
};
|
||
|
|
|
||
|
|
static struct usb_descriptor_header *ss_loopback_descs[] = {
|
||
|
|
(struct usb_descriptor_header *) &loopback_intf,
|
||
|
|
(struct usb_descriptor_header *) &ss_loop_source_desc,
|
||
|
|
(struct usb_descriptor_header *) &ss_loop_source_comp_desc,
|
||
|
|
(struct usb_descriptor_header *) &ss_loop_sink_desc,
|
||
|
|
(struct usb_descriptor_header *) &ss_loop_sink_comp_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 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;
|
||
|
|
int ret;
|
||
|
|
|
||
|
|
/* allocate interface ID(s) */
|
||
|
|
id = usb_interface_id(c, f);
|
||
|
|
if (id < 0)
|
||
|
|
return id;
|
||
|
|
loopback_intf.bInterfaceNumber = id;
|
||
|
|
|
||
|
|
id = usb_string_id(cdev);
|
||
|
|
if (id < 0)
|
||
|
|
return id;
|
||
|
|
strings_loopback[0].id = id;
|
||
|
|
loopback_intf.iInterface = 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->out_ep = usb_ep_autoconfig(cdev->gadget, &fs_loop_sink_desc);
|
||
|
|
if (!loop->out_ep)
|
||
|
|
goto autoconf_fail;
|
||
|
|
|
||
|
|
/* support high speed hardware */
|
||
|
|
hs_loop_source_desc.bEndpointAddress =
|
||
|
|
fs_loop_source_desc.bEndpointAddress;
|
||
|
|
hs_loop_sink_desc.bEndpointAddress = fs_loop_sink_desc.bEndpointAddress;
|
||
|
|
|
||
|
|
/* support super speed hardware */
|
||
|
|
ss_loop_source_desc.bEndpointAddress =
|
||
|
|
fs_loop_source_desc.bEndpointAddress;
|
||
|
|
ss_loop_sink_desc.bEndpointAddress = fs_loop_sink_desc.bEndpointAddress;
|
||
|
|
|
||
|
|
ret = usb_assign_descriptors(f, fs_loopback_descs, hs_loopback_descs,
|
||
|
|
ss_loopback_descs, ss_loopback_descs);
|
||
|
|
if (ret)
|
||
|
|
return ret;
|
||
|
|
|
||
|
|
DBG(cdev, "%s speed %s: IN/%s, OUT/%s\n",
|
||
|
|
(gadget_is_superspeed(c->cdev->gadget) ? "super" :
|
||
|
|
(gadget_is_dualspeed(c->cdev->gadget) ? "dual" : "full")),
|
||
|
|
f->name, loop->in_ep->name, loop->out_ep->name);
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static void lb_free_func(struct usb_function *f)
|
||
|
|
{
|
||
|
|
struct f_lb_opts *opts;
|
||
|
|
|
||
|
|
opts = container_of(f->fi, struct f_lb_opts, func_inst);
|
||
|
|
|
||
|
|
mutex_lock(&opts->lock);
|
||
|
|
opts->refcnt--;
|
||
|
|
mutex_unlock(&opts->lock);
|
||
|
|
|
||
|
|
usb_free_all_descriptors(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) {
|
||
|
|
/*
|
||
|
|
* We received some data from the host so let's
|
||
|
|
* queue it so host can read the from our in ep
|
||
|
|
*/
|
||
|
|
struct usb_request *in_req = req->context;
|
||
|
|
|
||
|
|
in_req->zero = (req->actual < req->length);
|
||
|
|
in_req->length = req->actual;
|
||
|
|
ep = loop->in_ep;
|
||
|
|
req = in_req;
|
||
|
|
} else {
|
||
|
|
/*
|
||
|
|
* We have just looped back a bunch of data
|
||
|
|
* to host. Now let's wait for some more data.
|
||
|
|
*/
|
||
|
|
req = req->context;
|
||
|
|
ep = loop->out_ep;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* queue the buffer back to host or for next bunch of data */
|
||
|
|
status = usb_ep_queue(ep, req, GFP_ATOMIC);
|
||
|
|
if (status == 0) {
|
||
|
|
return;
|
||
|
|
} else {
|
||
|
|
ERROR(cdev, "Unable to loop back buffer to %s: %d\n",
|
||
|
|
ep->name, status);
|
||
|
|
goto free_req;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* "should never get here" */
|
||
|
|
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_req:
|
||
|
|
usb_ep_free_request(ep == loop->in_ep ?
|
||
|
|
loop->out_ep : loop->in_ep,
|
||
|
|
req->context);
|
||
|
|
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, NULL, NULL);
|
||
|
|
VDBG(cdev, "%s disabled\n", loop->function.name);
|
||
|
|
}
|
||
|
|
|
||
|
|
static inline struct usb_request *lb_alloc_ep_req(struct usb_ep *ep, int len)
|
||
|
|
{
|
||
|
|
return alloc_ep_req(ep, len);
|
||
|
|
}
|
||
|
|
|
||
|
|
static int alloc_requests(struct usb_composite_dev *cdev,
|
||
|
|
struct f_loopback *loop)
|
||
|
|
{
|
||
|
|
struct usb_request *in_req, *out_req;
|
||
|
|
int i;
|
||
|
|
int result = 0;
|
||
|
|
|
||
|
|
/*
|
||
|
|
* allocate a bunch of read buffers and queue them all at once.
|
||
|
|
* we buffer at most 'qlen' transfers; We allocate buffers only
|
||
|
|
* for out transfer and reuse them in IN transfers to implement
|
||
|
|
* our loopback functionality
|
||
|
|
*/
|
||
|
|
for (i = 0; i < loop->qlen && result == 0; i++) {
|
||
|
|
result = -ENOMEM;
|
||
|
|
|
||
|
|
in_req = usb_ep_alloc_request(loop->in_ep, GFP_ATOMIC);
|
||
|
|
if (!in_req)
|
||
|
|
goto fail;
|
||
|
|
|
||
|
|
out_req = lb_alloc_ep_req(loop->out_ep, loop->buflen);
|
||
|
|
if (!out_req)
|
||
|
|
goto fail_in;
|
||
|
|
|
||
|
|
in_req->complete = loopback_complete;
|
||
|
|
out_req->complete = loopback_complete;
|
||
|
|
|
||
|
|
in_req->buf = out_req->buf;
|
||
|
|
/* length will be set in complete routine */
|
||
|
|
in_req->context = out_req;
|
||
|
|
out_req->context = in_req;
|
||
|
|
|
||
|
|
result = usb_ep_queue(loop->out_ep, out_req, GFP_ATOMIC);
|
||
|
|
if (result) {
|
||
|
|
ERROR(cdev, "%s queue req --> %d\n",
|
||
|
|
loop->out_ep->name, result);
|
||
|
|
goto fail_out;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
fail_out:
|
||
|
|
free_ep_req(loop->out_ep, out_req);
|
||
|
|
fail_in:
|
||
|
|
usb_ep_free_request(loop->in_ep, in_req);
|
||
|
|
fail:
|
||
|
|
return result;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int enable_endpoint(struct usb_composite_dev *cdev,
|
||
|
|
struct f_loopback *loop, struct usb_ep *ep)
|
||
|
|
{
|
||
|
|
int result;
|
||
|
|
|
||
|
|
result = config_ep_by_speed(cdev->gadget, &(loop->function), ep);
|
||
|
|
if (result)
|
||
|
|
goto out;
|
||
|
|
|
||
|
|
result = usb_ep_enable(ep);
|
||
|
|
if (result < 0)
|
||
|
|
goto out;
|
||
|
|
ep->driver_data = loop;
|
||
|
|
result = 0;
|
||
|
|
|
||
|
|
out:
|
||
|
|
return result;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int
|
||
|
|
enable_loopback(struct usb_composite_dev *cdev, struct f_loopback *loop)
|
||
|
|
{
|
||
|
|
int result = 0;
|
||
|
|
|
||
|
|
result = enable_endpoint(cdev, loop, loop->in_ep);
|
||
|
|
if (result)
|
||
|
|
goto out;
|
||
|
|
|
||
|
|
result = enable_endpoint(cdev, loop, loop->out_ep);
|
||
|
|
if (result)
|
||
|
|
goto disable_in;
|
||
|
|
|
||
|
|
result = alloc_requests(cdev, loop);
|
||
|
|
if (result)
|
||
|
|
goto disable_out;
|
||
|
|
|
||
|
|
DBG(cdev, "%s enabled\n", loop->function.name);
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
disable_out:
|
||
|
|
usb_ep_disable(loop->out_ep);
|
||
|
|
disable_in:
|
||
|
|
usb_ep_disable(loop->in_ep);
|
||
|
|
out:
|
||
|
|
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 */
|
||
|
|
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 struct usb_function *loopback_alloc(struct usb_function_instance *fi)
|
||
|
|
{
|
||
|
|
struct f_loopback *loop;
|
||
|
|
struct f_lb_opts *lb_opts;
|
||
|
|
|
||
|
|
loop = kzalloc(sizeof *loop, GFP_KERNEL);
|
||
|
|
if (!loop)
|
||
|
|
return ERR_PTR(-ENOMEM);
|
||
|
|
|
||
|
|
lb_opts = container_of(fi, struct f_lb_opts, func_inst);
|
||
|
|
|
||
|
|
mutex_lock(&lb_opts->lock);
|
||
|
|
lb_opts->refcnt++;
|
||
|
|
mutex_unlock(&lb_opts->lock);
|
||
|
|
|
||
|
|
loop->buflen = lb_opts->bulk_buflen;
|
||
|
|
loop->qlen = lb_opts->qlen;
|
||
|
|
if (!loop->qlen)
|
||
|
|
loop->qlen = 32;
|
||
|
|
|
||
|
|
loop->function.name = "loopback";
|
||
|
|
loop->function.bind = loopback_bind;
|
||
|
|
loop->function.set_alt = loopback_set_alt;
|
||
|
|
loop->function.disable = loopback_disable;
|
||
|
|
loop->function.strings = loopback_strings;
|
||
|
|
|
||
|
|
loop->function.free_func = lb_free_func;
|
||
|
|
|
||
|
|
return &loop->function;
|
||
|
|
}
|
||
|
|
|
||
|
|
static inline struct f_lb_opts *to_f_lb_opts(struct config_item *item)
|
||
|
|
{
|
||
|
|
return container_of(to_config_group(item), struct f_lb_opts,
|
||
|
|
func_inst.group);
|
||
|
|
}
|
||
|
|
|
||
|
|
static void lb_attr_release(struct config_item *item)
|
||
|
|
{
|
||
|
|
struct f_lb_opts *lb_opts = to_f_lb_opts(item);
|
||
|
|
|
||
|
|
usb_put_function_instance(&lb_opts->func_inst);
|
||
|
|
}
|
||
|
|
|
||
|
|
static struct configfs_item_operations lb_item_ops = {
|
||
|
|
.release = lb_attr_release,
|
||
|
|
};
|
||
|
|
|
||
|
|
static ssize_t f_lb_opts_qlen_show(struct config_item *item, char *page)
|
||
|
|
{
|
||
|
|
struct f_lb_opts *opts = to_f_lb_opts(item);
|
||
|
|
int result;
|
||
|
|
|
||
|
|
mutex_lock(&opts->lock);
|
||
|
|
result = sprintf(page, "%d\n", opts->qlen);
|
||
|
|
mutex_unlock(&opts->lock);
|
||
|
|
|
||
|
|
return result;
|
||
|
|
}
|
||
|
|
|
||
|
|
static ssize_t f_lb_opts_qlen_store(struct config_item *item,
|
||
|
|
const char *page, size_t len)
|
||
|
|
{
|
||
|
|
struct f_lb_opts *opts = to_f_lb_opts(item);
|
||
|
|
int ret;
|
||
|
|
u32 num;
|
||
|
|
|
||
|
|
mutex_lock(&opts->lock);
|
||
|
|
if (opts->refcnt) {
|
||
|
|
ret = -EBUSY;
|
||
|
|
goto end;
|
||
|
|
}
|
||
|
|
|
||
|
|
ret = kstrtou32(page, 0, &num);
|
||
|
|
if (ret)
|
||
|
|
goto end;
|
||
|
|
|
||
|
|
opts->qlen = num;
|
||
|
|
ret = len;
|
||
|
|
end:
|
||
|
|
mutex_unlock(&opts->lock);
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
CONFIGFS_ATTR(f_lb_opts_, qlen);
|
||
|
|
|
||
|
|
static ssize_t f_lb_opts_bulk_buflen_show(struct config_item *item, char *page)
|
||
|
|
{
|
||
|
|
struct f_lb_opts *opts = to_f_lb_opts(item);
|
||
|
|
int result;
|
||
|
|
|
||
|
|
mutex_lock(&opts->lock);
|
||
|
|
result = sprintf(page, "%d\n", opts->bulk_buflen);
|
||
|
|
mutex_unlock(&opts->lock);
|
||
|
|
|
||
|
|
return result;
|
||
|
|
}
|
||
|
|
|
||
|
|
static ssize_t f_lb_opts_bulk_buflen_store(struct config_item *item,
|
||
|
|
const char *page, size_t len)
|
||
|
|
{
|
||
|
|
struct f_lb_opts *opts = to_f_lb_opts(item);
|
||
|
|
int ret;
|
||
|
|
u32 num;
|
||
|
|
|
||
|
|
mutex_lock(&opts->lock);
|
||
|
|
if (opts->refcnt) {
|
||
|
|
ret = -EBUSY;
|
||
|
|
goto end;
|
||
|
|
}
|
||
|
|
|
||
|
|
ret = kstrtou32(page, 0, &num);
|
||
|
|
if (ret)
|
||
|
|
goto end;
|
||
|
|
|
||
|
|
opts->bulk_buflen = num;
|
||
|
|
ret = len;
|
||
|
|
end:
|
||
|
|
mutex_unlock(&opts->lock);
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
CONFIGFS_ATTR(f_lb_opts_, bulk_buflen);
|
||
|
|
|
||
|
|
static struct configfs_attribute *lb_attrs[] = {
|
||
|
|
&f_lb_opts_attr_qlen,
|
||
|
|
&f_lb_opts_attr_bulk_buflen,
|
||
|
|
NULL,
|
||
|
|
};
|
||
|
|
|
||
|
|
static const struct config_item_type lb_func_type = {
|
||
|
|
.ct_item_ops = &lb_item_ops,
|
||
|
|
.ct_attrs = lb_attrs,
|
||
|
|
.ct_owner = THIS_MODULE,
|
||
|
|
};
|
||
|
|
|
||
|
|
static void lb_free_instance(struct usb_function_instance *fi)
|
||
|
|
{
|
||
|
|
struct f_lb_opts *lb_opts;
|
||
|
|
|
||
|
|
lb_opts = container_of(fi, struct f_lb_opts, func_inst);
|
||
|
|
kfree(lb_opts);
|
||
|
|
}
|
||
|
|
|
||
|
|
static struct usb_function_instance *loopback_alloc_instance(void)
|
||
|
|
{
|
||
|
|
struct f_lb_opts *lb_opts;
|
||
|
|
|
||
|
|
lb_opts = kzalloc(sizeof(*lb_opts), GFP_KERNEL);
|
||
|
|
if (!lb_opts)
|
||
|
|
return ERR_PTR(-ENOMEM);
|
||
|
|
mutex_init(&lb_opts->lock);
|
||
|
|
lb_opts->func_inst.free_func_inst = lb_free_instance;
|
||
|
|
lb_opts->bulk_buflen = GZERO_BULK_BUFLEN;
|
||
|
|
lb_opts->qlen = GZERO_QLEN;
|
||
|
|
|
||
|
|
config_group_init_type_name(&lb_opts->func_inst.group, "",
|
||
|
|
&lb_func_type);
|
||
|
|
|
||
|
|
return &lb_opts->func_inst;
|
||
|
|
}
|
||
|
|
DECLARE_USB_FUNCTION(Loopback, loopback_alloc_instance, loopback_alloc);
|
||
|
|
|
||
|
|
int __init lb_modinit(void)
|
||
|
|
{
|
||
|
|
return usb_function_register(&Loopbackusb_func);
|
||
|
|
}
|
||
|
|
|
||
|
|
void __exit lb_modexit(void)
|
||
|
|
{
|
||
|
|
usb_function_unregister(&Loopbackusb_func);
|
||
|
|
}
|
||
|
|
|
||
|
|
MODULE_LICENSE("GPL");
|