usb gadget zero: split out loopback config
This splits the gadget zero "loopback" configuration into a standalone "configuration driver", building on the composite gadget framework code. It doesn't yet pull the original code out of gadget zero or update how that driver is built. Signed-off-by: David Brownell <dbrownell@users.sourceforge.net> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
David Brownell
Greg Kroah-Hartman
parent
a400cadc07
commit
e5760fdac8
381
drivers/usb/gadget/f_loopback.c
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381
drivers/usb/gadget/f_loopback.c
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@ -0,0 +1,381 @@
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/*
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* f_loopback.c - USB peripheral loopback configuration driver
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*
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* Copyright (C) 2003-2008 David Brownell
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* Copyright (C) 2008 by Nokia Corporation
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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/* #define VERBOSE_DEBUG */
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#include <linux/kernel.h>
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#include <linux/utsname.h>
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#include <linux/device.h>
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#include "g_zero.h"
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#include "gadget_chips.h"
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/*
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* LOOPBACK FUNCTION ... a testing vehicle for USB peripherals,
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*
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* This takes messages of various sizes written OUT to a device, and loops
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* them back so they can be read IN from it. It has been used by certain
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* test applications. It supports limited testing of data queueing logic.
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*
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*
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* This is currently packaged as a configuration driver, which can't be
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* combined with other functions to make composite devices. However, it
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* can be combined with other independent configurations.
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*/
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struct f_loopback {
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struct usb_function function;
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struct usb_ep *in_ep;
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struct usb_ep *out_ep;
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};
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static inline struct f_loopback *func_to_loop(struct usb_function *f)
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{
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return container_of(f, struct f_loopback, function);
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}
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static unsigned qlen = 32;
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module_param(qlen, uint, 0);
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MODULE_PARM_DESC(qlenn, "depth of loopback queue");
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/*-------------------------------------------------------------------------*/
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static struct usb_interface_descriptor loopback_intf = {
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.bLength = sizeof loopback_intf,
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.bDescriptorType = USB_DT_INTERFACE,
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.bNumEndpoints = 2,
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.bInterfaceClass = USB_CLASS_VENDOR_SPEC,
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/* .iInterface = DYNAMIC */
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};
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/* full speed support: */
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static struct usb_endpoint_descriptor fs_source_desc = {
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.bLength = USB_DT_ENDPOINT_SIZE,
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.bDescriptorType = USB_DT_ENDPOINT,
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.bEndpointAddress = USB_DIR_IN,
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.bmAttributes = USB_ENDPOINT_XFER_BULK,
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};
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static struct usb_endpoint_descriptor fs_sink_desc = {
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.bLength = USB_DT_ENDPOINT_SIZE,
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.bDescriptorType = USB_DT_ENDPOINT,
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.bEndpointAddress = USB_DIR_OUT,
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.bmAttributes = USB_ENDPOINT_XFER_BULK,
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};
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static struct usb_descriptor_header *fs_loopback_descs[] = {
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(struct usb_descriptor_header *) &loopback_intf,
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(struct usb_descriptor_header *) &fs_sink_desc,
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(struct usb_descriptor_header *) &fs_source_desc,
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NULL,
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};
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/* high speed support: */
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static struct usb_endpoint_descriptor hs_source_desc = {
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.bLength = USB_DT_ENDPOINT_SIZE,
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.bDescriptorType = USB_DT_ENDPOINT,
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.bmAttributes = USB_ENDPOINT_XFER_BULK,
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.wMaxPacketSize = __constant_cpu_to_le16(512),
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};
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static struct usb_endpoint_descriptor hs_sink_desc = {
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.bLength = USB_DT_ENDPOINT_SIZE,
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.bDescriptorType = USB_DT_ENDPOINT,
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.bmAttributes = USB_ENDPOINT_XFER_BULK,
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.wMaxPacketSize = __constant_cpu_to_le16(512),
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};
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static struct usb_descriptor_header *hs_loopback_descs[] = {
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(struct usb_descriptor_header *) &loopback_intf,
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(struct usb_descriptor_header *) &hs_source_desc,
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(struct usb_descriptor_header *) &hs_sink_desc,
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NULL,
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};
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/* function-specific strings: */
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static struct usb_string strings_loopback[] = {
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[0].s = "loop input to output",
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{ } /* end of list */
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};
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static struct usb_gadget_strings stringtab_loop = {
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.language = 0x0409, /* en-us */
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.strings = strings_loopback,
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};
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static struct usb_gadget_strings *loopback_strings[] = {
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&stringtab_loop,
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NULL,
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};
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/*-------------------------------------------------------------------------*/
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static int __init
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loopback_bind(struct usb_configuration *c, struct usb_function *f)
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{
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struct usb_composite_dev *cdev = c->cdev;
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struct f_loopback *loop = func_to_loop(f);
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int id;
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/* allocate interface ID(s) */
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id = usb_interface_id(c, f);
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if (id < 0)
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return id;
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loopback_intf.bInterfaceNumber = id;
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/* allocate endpoints */
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loop->in_ep = usb_ep_autoconfig(cdev->gadget, &fs_source_desc);
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if (!loop->in_ep) {
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autoconf_fail:
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ERROR(cdev, "%s: can't autoconfigure on %s\n",
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f->name, cdev->gadget->name);
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return -ENODEV;
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}
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loop->in_ep->driver_data = cdev; /* claim */
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loop->out_ep = usb_ep_autoconfig(cdev->gadget, &fs_sink_desc);
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if (!loop->out_ep)
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goto autoconf_fail;
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loop->out_ep->driver_data = cdev; /* claim */
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/* support high speed hardware */
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if (gadget_is_dualspeed(c->cdev->gadget)) {
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hs_source_desc.bEndpointAddress =
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fs_source_desc.bEndpointAddress;
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hs_sink_desc.bEndpointAddress =
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fs_sink_desc.bEndpointAddress;
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f->hs_descriptors = hs_loopback_descs;
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}
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DBG(cdev, "%s speed %s: IN/%s, OUT/%s\n",
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gadget_is_dualspeed(c->cdev->gadget) ? "dual" : "full",
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f->name, loop->in_ep->name, loop->out_ep->name);
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return 0;
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}
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static void
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loopback_unbind(struct usb_configuration *c, struct usb_function *f)
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{
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kfree(func_to_loop(f));
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}
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static void loopback_complete(struct usb_ep *ep, struct usb_request *req)
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{
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struct f_loopback *loop = ep->driver_data;
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struct usb_composite_dev *cdev = loop->function.config->cdev;
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int status = req->status;
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switch (status) {
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case 0: /* normal completion? */
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if (ep == loop->out_ep) {
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/* loop this OUT packet back IN to the host */
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req->zero = (req->actual < req->length);
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req->length = req->actual;
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status = usb_ep_queue(loop->in_ep, req, GFP_ATOMIC);
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if (status == 0)
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return;
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/* "should never get here" */
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ERROR(cdev, "can't loop %s to %s: %d\n",
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ep->name, loop->in_ep->name,
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status);
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}
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/* queue the buffer for some later OUT packet */
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req->length = buflen;
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status = usb_ep_queue(loop->out_ep, req, GFP_ATOMIC);
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if (status == 0)
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return;
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/* "should never get here" */
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/* FALLTHROUGH */
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default:
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ERROR(cdev, "%s loop complete --> %d, %d/%d\n", ep->name,
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status, req->actual, req->length);
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/* FALLTHROUGH */
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/* NOTE: since this driver doesn't maintain an explicit record
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* of requests it submitted (just maintains qlen count), we
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* rely on the hardware driver to clean up on disconnect or
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* endpoint disable.
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*/
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case -ECONNABORTED: /* hardware forced ep reset */
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case -ECONNRESET: /* request dequeued */
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case -ESHUTDOWN: /* disconnect from host */
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free_ep_req(ep, req);
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return;
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}
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}
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static void disable_loopback(struct f_loopback *loop)
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{
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struct usb_composite_dev *cdev;
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cdev = loop->function.config->cdev;
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disable_endpoints(cdev, loop->in_ep, loop->out_ep);
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VDBG(cdev, "%s disabled\n", loop->function.name);
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}
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static int
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enable_loopback(struct usb_composite_dev *cdev, struct f_loopback *loop)
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{
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int result = 0;
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const struct usb_endpoint_descriptor *src, *sink;
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struct usb_ep *ep;
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struct usb_request *req;
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unsigned i;
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src = ep_choose(cdev->gadget, &hs_source_desc, &fs_source_desc);
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sink = ep_choose(cdev->gadget, &hs_sink_desc, &fs_sink_desc);
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/* one endpoint writes data back IN to the host */
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ep = loop->in_ep;
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result = usb_ep_enable(ep, src);
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if (result < 0)
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return result;
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ep->driver_data = loop;
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/* one endpoint just reads OUT packets */
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ep = loop->out_ep;
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result = usb_ep_enable(ep, sink);
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if (result < 0) {
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fail0:
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ep = loop->in_ep;
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usb_ep_disable(ep);
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ep->driver_data = NULL;
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return result;
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}
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ep->driver_data = loop;
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/* allocate a bunch of read buffers and queue them all at once.
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* we buffer at most 'qlen' transfers; fewer if any need more
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* than 'buflen' bytes each.
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*/
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for (i = 0; i < qlen && result == 0; i++) {
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req = alloc_ep_req(ep);
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if (req) {
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req->complete = loopback_complete;
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result = usb_ep_queue(ep, req, GFP_ATOMIC);
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if (result)
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ERROR(cdev, "%s queue req --> %d\n",
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ep->name, result);
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} else {
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usb_ep_disable(ep);
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ep->driver_data = NULL;
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result = -ENOMEM;
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goto fail0;
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}
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}
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DBG(cdev, "%s enabled\n", loop->function.name);
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return result;
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}
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static int loopback_set_alt(struct usb_function *f,
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unsigned intf, unsigned alt)
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{
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struct f_loopback *loop = func_to_loop(f);
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struct usb_composite_dev *cdev = f->config->cdev;
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/* we know alt is zero */
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if (loop->in_ep->driver_data)
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disable_loopback(loop);
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return enable_loopback(cdev, loop);
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}
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static void loopback_disable(struct usb_function *f)
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{
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struct f_loopback *loop = func_to_loop(f);
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disable_loopback(loop);
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}
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/*-------------------------------------------------------------------------*/
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static int __init loopback_bind_config(struct usb_configuration *c)
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{
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struct f_loopback *loop;
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int status;
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loop = kzalloc(sizeof *loop, GFP_KERNEL);
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if (!loop)
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return -ENOMEM;
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loop->function.name = "loopback";
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loop->function.descriptors = fs_loopback_descs;
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loop->function.bind = loopback_bind;
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loop->function.unbind = loopback_unbind;
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loop->function.set_alt = loopback_set_alt;
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loop->function.disable = loopback_disable;
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status = usb_add_function(c, &loop->function);
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if (status)
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kfree(loop);
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return status;
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}
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static struct usb_configuration loopback_driver = {
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.label = "loopback",
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.strings = loopback_strings,
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.bind = loopback_bind_config,
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.bConfigurationValue = 2,
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.bmAttributes = USB_CONFIG_ATT_SELFPOWER,
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.bMaxPower = 1, /* 2 mA, minimal */
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/* .iConfiguration = DYNAMIC */
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};
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/**
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* loopback_add - add a loopback testing configuration to a device
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* @cdev: the device to support the loopback configuration
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*/
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int __init loopback_add(struct usb_composite_dev *cdev)
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{
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int id;
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/* allocate string ID(s) */
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id = usb_string_id(cdev);
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if (id < 0)
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return id;
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strings_loopback[0].id = id;
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loopback_intf.iInterface = id;
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loopback_driver.iConfiguration = id;
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/* support OTG systems */
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if (gadget_is_otg(cdev->gadget)) {
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loopback_driver.descriptors = otg_desc;
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loopback_driver.bmAttributes |= USB_CONFIG_ATT_WAKEUP;
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}
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return usb_add_config(cdev, &loopback_driver);
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}
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@ -9,6 +9,7 @@
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#include <linux/usb/composite.h>
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/* global state */
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extern unsigned buflen;
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extern const struct usb_descriptor_header *otg_desc[];
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/* common utilities */
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@ -19,5 +20,6 @@ void disable_endpoints(struct usb_composite_dev *cdev,
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/* configuration-specific linkup */
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int sourcesink_add(struct usb_composite_dev *cdev);
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int loopback_add(struct usb_composite_dev *cdev);
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#endif /* __G_ZERO_H */
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