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f_sourcesink.c
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f_sourcesink.c
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// SPDX-License-Identifier: GPL-2.0+
/*
* f_sourcesink.c - USB peripheral source/sink 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/usb/composite.h>
#include <linux/err.h>
#include "g_zero.h"
#include "u_f.h"
/*
* SOURCE/SINK FUNCTION ... a primary testing vehicle for USB peripheral
* controller drivers.
*
* This just sinks bulk packets OUT to the peripheral and sources them IN
* to the host, optionally with specific data patterns for integrity tests.
* As such it supports basic functionality and load tests.
*
* In terms of control messaging, this supports all the standard requests
* plus two that support control-OUT tests. If the optional "autoresume"
* mode is enabled, it provides good functional coverage for the "USBCV"
* test harness from USB-IF.
*/
struct f_sourcesink {
struct usb_function function;
struct usb_ep *in_ep;
struct usb_ep *out_ep;
struct usb_ep *iso_in_ep;
struct usb_ep *iso_out_ep;
int cur_alt;
unsigned pattern;
unsigned isoc_interval;
unsigned isoc_maxpacket;
unsigned isoc_mult;
unsigned isoc_maxburst;
unsigned buflen;
unsigned bulk_qlen;
unsigned iso_qlen;
};
static inline struct f_sourcesink *func_to_ss(struct usb_function *f)
{
return container_of(f, struct f_sourcesink, function);
}
/*-------------------------------------------------------------------------*/
static struct usb_interface_descriptor source_sink_intf_alt0 = {
.bLength = USB_DT_INTERFACE_SIZE,
.bDescriptorType = USB_DT_INTERFACE,
.bAlternateSetting = 0,
.bNumEndpoints = 2,
.bInterfaceClass = USB_CLASS_VENDOR_SPEC,
/* .iInterface = DYNAMIC */
};
static struct usb_interface_descriptor source_sink_intf_alt1 = {
.bLength = USB_DT_INTERFACE_SIZE,
.bDescriptorType = USB_DT_INTERFACE,
.bAlternateSetting = 1,
.bNumEndpoints = 4,
.bInterfaceClass = USB_CLASS_VENDOR_SPEC,
/* .iInterface = DYNAMIC */
};
/* full speed support: */
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 struct usb_endpoint_descriptor fs_iso_source_desc = {
.bLength = USB_DT_ENDPOINT_SIZE,
.bDescriptorType = USB_DT_ENDPOINT,
.bEndpointAddress = USB_DIR_IN,
.bmAttributes = USB_ENDPOINT_XFER_ISOC,
.wMaxPacketSize = cpu_to_le16(1023),
.bInterval = 4,
};
static struct usb_endpoint_descriptor fs_iso_sink_desc = {
.bLength = USB_DT_ENDPOINT_SIZE,
.bDescriptorType = USB_DT_ENDPOINT,
.bEndpointAddress = USB_DIR_OUT,
.bmAttributes = USB_ENDPOINT_XFER_ISOC,
.wMaxPacketSize = cpu_to_le16(1023),
.bInterval = 4,
};
static struct usb_descriptor_header *fs_source_sink_descs[] = {
(struct usb_descriptor_header *) &source_sink_intf_alt0,
(struct usb_descriptor_header *) &fs_sink_desc,
(struct usb_descriptor_header *) &fs_source_desc,
(struct usb_descriptor_header *) &source_sink_intf_alt1,
#define FS_ALT_IFC_1_OFFSET 3
(struct usb_descriptor_header *) &fs_sink_desc,
(struct usb_descriptor_header *) &fs_source_desc,
(struct usb_descriptor_header *) &fs_iso_sink_desc,
(struct usb_descriptor_header *) &fs_iso_source_desc,
NULL,
};
/* high speed support: */
static struct usb_endpoint_descriptor hs_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_sink_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_iso_source_desc = {
.bLength = USB_DT_ENDPOINT_SIZE,
.bDescriptorType = USB_DT_ENDPOINT,
.bmAttributes = USB_ENDPOINT_XFER_ISOC,
.wMaxPacketSize = cpu_to_le16(1024),
.bInterval = 4,
};
static struct usb_endpoint_descriptor hs_iso_sink_desc = {
.bLength = USB_DT_ENDPOINT_SIZE,
.bDescriptorType = USB_DT_ENDPOINT,
.bmAttributes = USB_ENDPOINT_XFER_ISOC,
.wMaxPacketSize = cpu_to_le16(1024),
.bInterval = 4,
};
static struct usb_descriptor_header *hs_source_sink_descs[] = {
(struct usb_descriptor_header *) &source_sink_intf_alt0,
(struct usb_descriptor_header *) &hs_source_desc,
(struct usb_descriptor_header *) &hs_sink_desc,
(struct usb_descriptor_header *) &source_sink_intf_alt1,
#define HS_ALT_IFC_1_OFFSET 3
(struct usb_descriptor_header *) &hs_source_desc,
(struct usb_descriptor_header *) &hs_sink_desc,
(struct usb_descriptor_header *) &hs_iso_source_desc,
(struct usb_descriptor_header *) &hs_iso_sink_desc,
NULL,
};
/* super speed support: */
static struct usb_endpoint_descriptor ss_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_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_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_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_endpoint_descriptor ss_iso_source_desc = {
.bLength = USB_DT_ENDPOINT_SIZE,
.bDescriptorType = USB_DT_ENDPOINT,
.bmAttributes = USB_ENDPOINT_XFER_ISOC,
.wMaxPacketSize = cpu_to_le16(1024),
.bInterval = 4,
};
static struct usb_ss_ep_comp_descriptor ss_iso_source_comp_desc = {
.bLength = USB_DT_SS_EP_COMP_SIZE,
.bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
.bMaxBurst = 0,
.bmAttributes = 0,
.wBytesPerInterval = cpu_to_le16(1024),
};
static struct usb_endpoint_descriptor ss_iso_sink_desc = {
.bLength = USB_DT_ENDPOINT_SIZE,
.bDescriptorType = USB_DT_ENDPOINT,
.bmAttributes = USB_ENDPOINT_XFER_ISOC,
.wMaxPacketSize = cpu_to_le16(1024),
.bInterval = 4,
};
static struct usb_ss_ep_comp_descriptor ss_iso_sink_comp_desc = {
.bLength = USB_DT_SS_EP_COMP_SIZE,
.bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
.bMaxBurst = 0,
.bmAttributes = 0,
.wBytesPerInterval = cpu_to_le16(1024),
};
static struct usb_descriptor_header *ss_source_sink_descs[] = {
(struct usb_descriptor_header *) &source_sink_intf_alt0,
(struct usb_descriptor_header *) &ss_source_desc,
(struct usb_descriptor_header *) &ss_source_comp_desc,
(struct usb_descriptor_header *) &ss_sink_desc,
(struct usb_descriptor_header *) &ss_sink_comp_desc,
(struct usb_descriptor_header *) &source_sink_intf_alt1,
#define SS_ALT_IFC_1_OFFSET 5
(struct usb_descriptor_header *) &ss_source_desc,
(struct usb_descriptor_header *) &ss_source_comp_desc,
(struct usb_descriptor_header *) &ss_sink_desc,
(struct usb_descriptor_header *) &ss_sink_comp_desc,
(struct usb_descriptor_header *) &ss_iso_source_desc,
(struct usb_descriptor_header *) &ss_iso_source_comp_desc,
(struct usb_descriptor_header *) &ss_iso_sink_desc,
(struct usb_descriptor_header *) &ss_iso_sink_comp_desc,
NULL,
};
/* function-specific strings: */
static struct usb_string strings_sourcesink[] = {
[0].s = "source and sink data",
{ } /* end of list */
};
static struct usb_gadget_strings stringtab_sourcesink = {
.language = 0x0409, /* en-us */
.strings = strings_sourcesink,
};
static struct usb_gadget_strings *sourcesink_strings[] = {
&stringtab_sourcesink,
NULL,
};
/*-------------------------------------------------------------------------*/
static inline struct usb_request *ss_alloc_ep_req(struct usb_ep *ep, int len)
{
return alloc_ep_req(ep, len);
}
static void disable_ep(struct usb_composite_dev *cdev, struct usb_ep *ep)
{
int value;
value = usb_ep_disable(ep);
if (value < 0)
DBG(cdev, "disable %s --> %d\n", ep->name, value);
}
void disable_endpoints(struct usb_composite_dev *cdev,
struct usb_ep *in, struct usb_ep *out,
struct usb_ep *iso_in, struct usb_ep *iso_out)
{
disable_ep(cdev, in);
disable_ep(cdev, out);
if (iso_in)
disable_ep(cdev, iso_in);
if (iso_out)
disable_ep(cdev, iso_out);
}
static int
sourcesink_bind(struct usb_configuration *c, struct usb_function *f)
{
struct usb_composite_dev *cdev = c->cdev;
struct f_sourcesink *ss = func_to_ss(f);
int id;
int ret;
/* allocate interface ID(s) */
id = usb_interface_id(c, f);
if (id < 0)
return id;
source_sink_intf_alt0.bInterfaceNumber = id;
source_sink_intf_alt1.bInterfaceNumber = id;
/* allocate bulk endpoints */
ss->in_ep = usb_ep_autoconfig(cdev->gadget, &fs_source_desc);
if (!ss->in_ep) {
autoconf_fail:
ERROR(cdev, "%s: can't autoconfigure on %s\n",
f->name, cdev->gadget->name);
return -ENODEV;
}
ss->out_ep = usb_ep_autoconfig(cdev->gadget, &fs_sink_desc);
if (!ss->out_ep)
goto autoconf_fail;
/* sanity check the isoc module parameters */
if (ss->isoc_interval < 1)
ss->isoc_interval = 1;
if (ss->isoc_interval > 16)
ss->isoc_interval = 16;
if (ss->isoc_mult > 2)
ss->isoc_mult = 2;
if (ss->isoc_maxburst > 15)
ss->isoc_maxburst = 15;
/* fill in the FS isoc descriptors from the module parameters */
fs_iso_source_desc.wMaxPacketSize = ss->isoc_maxpacket > 1023 ?
1023 : ss->isoc_maxpacket;
fs_iso_source_desc.bInterval = ss->isoc_interval;
fs_iso_sink_desc.wMaxPacketSize = ss->isoc_maxpacket > 1023 ?
1023 : ss->isoc_maxpacket;
fs_iso_sink_desc.bInterval = ss->isoc_interval;
/* allocate iso endpoints */
ss->iso_in_ep = usb_ep_autoconfig(cdev->gadget, &fs_iso_source_desc);
if (!ss->iso_in_ep)
goto no_iso;
ss->iso_out_ep = usb_ep_autoconfig(cdev->gadget, &fs_iso_sink_desc);
if (!ss->iso_out_ep) {
usb_ep_autoconfig_release(ss->iso_in_ep);
ss->iso_in_ep = NULL;
no_iso:
/*
* We still want to work even if the UDC doesn't have isoc
* endpoints, so null out the alt interface that contains
* them and continue.
*/
fs_source_sink_descs[FS_ALT_IFC_1_OFFSET] = NULL;
hs_source_sink_descs[HS_ALT_IFC_1_OFFSET] = NULL;
ss_source_sink_descs[SS_ALT_IFC_1_OFFSET] = NULL;
}
if (ss->isoc_maxpacket > 1024)
ss->isoc_maxpacket = 1024;
/* support high speed hardware */
hs_source_desc.bEndpointAddress = fs_source_desc.bEndpointAddress;
hs_sink_desc.bEndpointAddress = fs_sink_desc.bEndpointAddress;
/*
* Fill in the HS isoc descriptors from the module parameters.
* We assume that the user knows what they are doing and won't
* give parameters that their UDC doesn't support.
*/
hs_iso_source_desc.wMaxPacketSize = ss->isoc_maxpacket;
hs_iso_source_desc.wMaxPacketSize |= ss->isoc_mult << 11;
hs_iso_source_desc.bInterval = ss->isoc_interval;
hs_iso_source_desc.bEndpointAddress =
fs_iso_source_desc.bEndpointAddress;
hs_iso_sink_desc.wMaxPacketSize = ss->isoc_maxpacket;
hs_iso_sink_desc.wMaxPacketSize |= ss->isoc_mult << 11;
hs_iso_sink_desc.bInterval = ss->isoc_interval;
hs_iso_sink_desc.bEndpointAddress = fs_iso_sink_desc.bEndpointAddress;
/* support super speed hardware */
ss_source_desc.bEndpointAddress =
fs_source_desc.bEndpointAddress;
ss_sink_desc.bEndpointAddress =
fs_sink_desc.bEndpointAddress;
/*
* Fill in the SS isoc descriptors from the module parameters.
* We assume that the user knows what they are doing and won't
* give parameters that their UDC doesn't support.
*/
ss_iso_source_desc.wMaxPacketSize = ss->isoc_maxpacket;
ss_iso_source_desc.bInterval = ss->isoc_interval;
ss_iso_source_comp_desc.bmAttributes = ss->isoc_mult;
ss_iso_source_comp_desc.bMaxBurst = ss->isoc_maxburst;
ss_iso_source_comp_desc.wBytesPerInterval = ss->isoc_maxpacket *
(ss->isoc_mult + 1) * (ss->isoc_maxburst + 1);
ss_iso_source_desc.bEndpointAddress =
fs_iso_source_desc.bEndpointAddress;
ss_iso_sink_desc.wMaxPacketSize = ss->isoc_maxpacket;
ss_iso_sink_desc.bInterval = ss->isoc_interval;
ss_iso_sink_comp_desc.bmAttributes = ss->isoc_mult;
ss_iso_sink_comp_desc.bMaxBurst = ss->isoc_maxburst;
ss_iso_sink_comp_desc.wBytesPerInterval = ss->isoc_maxpacket *
(ss->isoc_mult + 1) * (ss->isoc_maxburst + 1);
ss_iso_sink_desc.bEndpointAddress = fs_iso_sink_desc.bEndpointAddress;
ret = usb_assign_descriptors(f, fs_source_sink_descs,
hs_source_sink_descs, ss_source_sink_descs,
ss_source_sink_descs);
if (ret)
return ret;
DBG(cdev, "%s speed %s: IN/%s, OUT/%s, ISO-IN/%s, ISO-OUT/%s\n",
(gadget_is_superspeed(c->cdev->gadget) ? "super" :
(gadget_is_dualspeed(c->cdev->gadget) ? "dual" : "full")),
f->name, ss->in_ep->name, ss->out_ep->name,
ss->iso_in_ep ? ss->iso_in_ep->name : "<none>",
ss->iso_out_ep ? ss->iso_out_ep->name : "<none>");
return 0;
}
static void
sourcesink_free_func(struct usb_function *f)
{
struct f_ss_opts *opts;
opts = container_of(f->fi, struct f_ss_opts, func_inst);
mutex_lock(&opts->lock);
opts->refcnt--;
mutex_unlock(&opts->lock);
usb_free_all_descriptors(f);
kfree(func_to_ss(f));
}
/* optionally require specific source/sink data patterns */
static int check_read_data(struct f_sourcesink *ss, struct usb_request *req)
{
unsigned i;
u8 *buf = req->buf;
struct usb_composite_dev *cdev = ss->function.config->cdev;
int max_packet_size = le16_to_cpu(ss->out_ep->desc->wMaxPacketSize);
if (ss->pattern == 2)
return 0;
for (i = 0; i < req->actual; i++, buf++) {
switch (ss->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. (We *WANT* it to
* get quickly out of sync if controllers or their drivers
* stutter for any reason, including buffer duplication...)
*/
case 1:
if (*buf == (u8)((i % max_packet_size) % 63))
continue;
break;
}
ERROR(cdev, "bad OUT byte, buf[%d] = %d\n", i, *buf);
usb_ep_set_halt(ss->out_ep);
return -EINVAL;
}
return 0;
}
static void reinit_write_data(struct usb_ep *ep, struct usb_request *req)
{
unsigned i;
u8 *buf = req->buf;
int max_packet_size = le16_to_cpu(ep->desc->wMaxPacketSize);
struct f_sourcesink *ss = ep->driver_data;
switch (ss->pattern) {
case 0:
memset(req->buf, 0, req->length);
break;
case 1:
for (i = 0; i < req->length; i++)
*buf++ = (u8) ((i % max_packet_size) % 63);
break;
case 2:
break;
}
}
static void source_sink_complete(struct usb_ep *ep, struct usb_request *req)
{
struct usb_composite_dev *cdev;
struct f_sourcesink *ss = ep->driver_data;
int status = req->status;
/* driver_data will be null if ep has been disabled */
if (!ss)
return;
cdev = ss->function.config->cdev;
switch (status) {
case 0: /* normal completion? */
if (ep == ss->out_ep) {
check_read_data(ss, req);
if (ss->pattern != 2)
memset(req->buf, 0x55, req->length);
}
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(cdev, "%s gone (%d), %d/%d\n", ep->name, status,
req->actual, req->length);
if (ep == ss->out_ep)
check_read_data(ss, 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(cdev, "%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(cdev, "kill %s: resubmit %d bytes --> %d\n",
ep->name, req->length, status);
usb_ep_set_halt(ep);
/* FIXME recover later ... somehow */
}
}
static int source_sink_start_ep(struct f_sourcesink *ss, bool is_in,
bool is_iso, int speed)
{
struct usb_ep *ep;
struct usb_request *req;
int i, size, qlen, status = 0;
if (is_iso) {
switch (speed) {
case USB_SPEED_SUPER:
size = ss->isoc_maxpacket *
(ss->isoc_mult + 1) *
(ss->isoc_maxburst + 1);
break;
case USB_SPEED_HIGH:
size = ss->isoc_maxpacket * (ss->isoc_mult + 1);
break;
default:
size = ss->isoc_maxpacket > 1023 ?
1023 : ss->isoc_maxpacket;
break;
}
ep = is_in ? ss->iso_in_ep : ss->iso_out_ep;
qlen = ss->iso_qlen;
} else {
ep = is_in ? ss->in_ep : ss->out_ep;
qlen = ss->bulk_qlen;
size = ss->buflen;
}
for (i = 0; i < qlen; i++) {
req = ss_alloc_ep_req(ep, size);
if (!req)
return -ENOMEM;
req->complete = source_sink_complete;
if (is_in)
reinit_write_data(ep, req);
else if (ss->pattern != 2)
memset(req->buf, 0x55, req->length);
status = usb_ep_queue(ep, req, GFP_ATOMIC);
if (status) {
struct usb_composite_dev *cdev;
cdev = ss->function.config->cdev;
ERROR(cdev, "start %s%s %s --> %d\n",
is_iso ? "ISO-" : "", is_in ? "IN" : "OUT",
ep->name, status);
free_ep_req(ep, req);
return status;
}
}
return status;
}
static void disable_source_sink(struct f_sourcesink *ss)
{
struct usb_composite_dev *cdev;
cdev = ss->function.config->cdev;
disable_endpoints(cdev, ss->in_ep, ss->out_ep, ss->iso_in_ep,
ss->iso_out_ep);
VDBG(cdev, "%s disabled\n", ss->function.name);
}
static int
enable_source_sink(struct usb_composite_dev *cdev, struct f_sourcesink *ss,
int alt)
{
int result = 0;
int speed = cdev->gadget->speed;
struct usb_ep *ep;
/* one bulk endpoint writes (sources) zeroes IN (to the host) */
ep = ss->in_ep;
result = config_ep_by_speed(cdev->gadget, &(ss->function), ep);
if (result)
return result;
result = usb_ep_enable(ep);
if (result < 0)
return result;
ep->driver_data = ss;
result = source_sink_start_ep(ss, true, false, speed);
if (result < 0) {
fail:
ep = ss->in_ep;
usb_ep_disable(ep);
return result;
}
/* one bulk endpoint reads (sinks) anything OUT (from the host) */
ep = ss->out_ep;
result = config_ep_by_speed(cdev->gadget, &(ss->function), ep);
if (result)
goto fail;
result = usb_ep_enable(ep);
if (result < 0)
goto fail;
ep->driver_data = ss;
result = source_sink_start_ep(ss, false, false, speed);
if (result < 0) {
fail2:
ep = ss->out_ep;
usb_ep_disable(ep);
goto fail;
}
if (alt == 0)
goto out;
/* one iso endpoint writes (sources) zeroes IN (to the host) */
ep = ss->iso_in_ep;
if (ep) {
result = config_ep_by_speed(cdev->gadget, &(ss->function), ep);
if (result)
goto fail2;
result = usb_ep_enable(ep);
if (result < 0)
goto fail2;
ep->driver_data = ss;
result = source_sink_start_ep(ss, true, true, speed);
if (result < 0) {
fail3:
ep = ss->iso_in_ep;
if (ep)
usb_ep_disable(ep);
goto fail2;
}
}
/* one iso endpoint reads (sinks) anything OUT (from the host) */
ep = ss->iso_out_ep;
if (ep) {
result = config_ep_by_speed(cdev->gadget, &(ss->function), ep);
if (result)
goto fail3;
result = usb_ep_enable(ep);
if (result < 0)
goto fail3;
ep->driver_data = ss;
result = source_sink_start_ep(ss, false, true, speed);
if (result < 0) {
usb_ep_disable(ep);
goto fail3;
}
}
out:
ss->cur_alt = alt;
DBG(cdev, "%s enabled, alt intf %d\n", ss->function.name, alt);
return result;
}
static int sourcesink_set_alt(struct usb_function *f,
unsigned intf, unsigned alt)
{
struct f_sourcesink *ss = func_to_ss(f);
struct usb_composite_dev *cdev = f->config->cdev;
disable_source_sink(ss);
return enable_source_sink(cdev, ss, alt);
}
static int sourcesink_get_alt(struct usb_function *f, unsigned intf)
{
struct f_sourcesink *ss = func_to_ss(f);
return ss->cur_alt;
}
static void sourcesink_disable(struct usb_function *f)
{
struct f_sourcesink *ss = func_to_ss(f);
disable_source_sink(ss);
}
/*-------------------------------------------------------------------------*/
static int sourcesink_setup(struct usb_function *f,
const struct usb_ctrlrequest *ctrl)
{
struct usb_configuration *c = f->config;
struct usb_request *req = c->cdev->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);
req->length = USB_COMP_EP0_BUFSIZ;
/* composite driver infrastructure handles everything except
* the two control test requests.
*/
switch (ctrl->bRequest) {
/*
* 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.
*
* NOTE: the Control-OUT data stays in req->buf ... better
* would be copying it into a scratch buffer, so that other
* requests may safely intervene.
*/
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 > req->length)
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 > req->length)
break;
value = w_length;
break;
default:
unknown:
VDBG(c->cdev,
"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 or status phase? */
if (value >= 0) {
VDBG(c->cdev, "source/sink req%02x.%02x v%04x i%04x l%d\n",
ctrl->bRequestType, ctrl->bRequest,
w_value, w_index, w_length);
req->zero = 0;
req->length = value;
value = usb_ep_queue(c->cdev->gadget->ep0, req, GFP_ATOMIC);
if (value < 0)
ERROR(c->cdev, "source/sink response, err %d\n",
value);
}
/* device either stalls (value < 0) or reports success */
return value;
}
static struct usb_function *source_sink_alloc_func(
struct usb_function_instance *fi)
{
struct f_sourcesink *ss;
struct f_ss_opts *ss_opts;
ss = kzalloc(sizeof(*ss), GFP_KERNEL);
if (!ss)
return ERR_PTR(-ENOMEM);
ss_opts = container_of(fi, struct f_ss_opts, func_inst);
mutex_lock(&ss_opts->lock);
ss_opts->refcnt++;
mutex_unlock(&ss_opts->lock);
ss->pattern = ss_opts->pattern;
ss->isoc_interval = ss_opts->isoc_interval;
ss->isoc_maxpacket = ss_opts->isoc_maxpacket;
ss->isoc_mult = ss_opts->isoc_mult;
ss->isoc_maxburst = ss_opts->isoc_maxburst;
ss->buflen = ss_opts->bulk_buflen;
ss->bulk_qlen = ss_opts->bulk_qlen;
ss->iso_qlen = ss_opts->iso_qlen;
ss->function.name = "source/sink";
ss->function.bind = sourcesink_bind;
ss->function.set_alt = sourcesink_set_alt;
ss->function.get_alt = sourcesink_get_alt;
ss->function.disable = sourcesink_disable;
ss->function.setup = sourcesink_setup;
ss->function.strings = sourcesink_strings;
ss->function.free_func = sourcesink_free_func;
return &ss->function;
}
static inline struct f_ss_opts *to_f_ss_opts(struct config_item *item)
{
return container_of(to_config_group(item), struct f_ss_opts,
func_inst.group);
}
static void ss_attr_release(struct config_item *item)
{
struct f_ss_opts *ss_opts = to_f_ss_opts(item);
usb_put_function_instance(&ss_opts->func_inst);
}
static struct configfs_item_operations ss_item_ops = {
.release = ss_attr_release,
};
static ssize_t f_ss_opts_pattern_show(struct config_item *item, char *page)
{
struct f_ss_opts *opts = to_f_ss_opts(item);
int result;
mutex_lock(&opts->lock);
result = sprintf(page, "%u\n", opts->pattern);
mutex_unlock(&opts->lock);
return result;
}
static ssize_t f_ss_opts_pattern_store(struct config_item *item,
const char *page, size_t len)
{
struct f_ss_opts *opts = to_f_ss_opts(item);
int ret;
u8 num;
mutex_lock(&opts->lock);
if (opts->refcnt) {
ret = -EBUSY;
goto end;
}
ret = kstrtou8(page, 0, &num);
if (ret)
goto end;
if (num != 0 && num != 1 && num != 2) {
ret = -EINVAL;
goto end;
}
opts->pattern = num;
ret = len;
end:
mutex_unlock(&opts->lock);
return ret;
}
CONFIGFS_ATTR(f_ss_opts_, pattern);
static ssize_t f_ss_opts_isoc_interval_show(struct config_item *item, char *page)
{
struct f_ss_opts *opts = to_f_ss_opts(item);
int result;
mutex_lock(&opts->lock);
result = sprintf(page, "%u\n", opts->isoc_interval);
mutex_unlock(&opts->lock);
return result;
}
static ssize_t f_ss_opts_isoc_interval_store(struct config_item *item,
const char *page, size_t len)
{
struct f_ss_opts *opts = to_f_ss_opts(item);
int ret;
u8 num;
mutex_lock(&opts->lock);
if (opts->refcnt) {
ret = -EBUSY;
goto end;
}
ret = kstrtou8(page, 0, &num);
if (ret)
goto end;
if (num > 16) {
ret = -EINVAL;
goto end;
}
opts->isoc_interval = num;
ret = len;
end:
mutex_unlock(&opts->lock);
return ret;
}
CONFIGFS_ATTR(f_ss_opts_, isoc_interval);
static ssize_t f_ss_opts_isoc_maxpacket_show(struct config_item *item, char *page)
{
struct f_ss_opts *opts = to_f_ss_opts(item);
int result;
mutex_lock(&opts->lock);
result = sprintf(page, "%u\n", opts->isoc_maxpacket);
mutex_unlock(&opts->lock);
return result;
}
static ssize_t f_ss_opts_isoc_maxpacket_store(struct config_item *item,
const char *page, size_t len)
{
struct f_ss_opts *opts = to_f_ss_opts(item);
int ret;
u16 num;
mutex_lock(&opts->lock);
if (opts->refcnt) {
ret = -EBUSY;
goto end;
}
ret = kstrtou16(page, 0, &num);