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/*
* This file is part of the libpayload project.
*
* Copyright (C) 2013 secunet Security Networks AG
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
//#define USB_DEBUG
#include <stdlib.h>
#include <usb/usb.h>
#include "generic_hub.h"
void
generic_hub_destroy(usbdev_t *const dev)
{
generic_hub_t *const hub = GEN_HUB(dev);
if (!hub)
return;
/* First, detach all devices behind this hub */
int port;
for (port = 1; port <= hub->num_ports; ++port) {
if (hub->ports[port] >= 0) {
usb_debug("generic_hub: Detachment at port %d\n", port);
usb_detach_device(dev->controller, hub->ports[port]);
hub->ports[port] = NO_DEV;
}
}
/* Disable all ports */
if (hub->ops->disable_port) {
for (port = 1; port <= hub->num_ports; ++port)
hub->ops->disable_port(dev, port);
}
free(hub->ports);
free(hub);
}
static int
generic_hub_debounce(usbdev_t *const dev, const int port)
{
generic_hub_t *const hub = GEN_HUB(dev);
const int step_ms = 1; /* linux uses 25ms, we're busy anyway */
const int at_least_ms = 100; /* 100ms as in usb20 spec 9.1.2 */
const int timeout_ms = 1500; /* linux uses this value */
int total_ms = 0;
int stable_ms = 0;
while (stable_ms < at_least_ms && total_ms < timeout_ms) {
mdelay(step_ms);
const int changed = hub->ops->port_status_changed(dev, port);
const int connected = hub->ops->port_connected(dev, port);
if (changed < 0 || connected < 0)
return -1;
if (!changed && connected) {
stable_ms += step_ms;
} else {
usb_debug("generic_hub: Unstable connection at %d\n",
port);
stable_ms = 0;
}
total_ms += step_ms;
}
if (total_ms >= timeout_ms)
usb_debug("generic_hub: Debouncing timed out at %d\n", port);
return 0; /* ignore timeouts, try to always go on */
}
int
generic_hub_wait_for_port(usbdev_t *const dev, const int port,
const int wait_for,
int (*const port_op)(usbdev_t *, int),
int timeout_steps, const int step_us)
{
int state;
do {
state = port_op(dev, port);
if (state < 0)
return -1;
else if (!!state == wait_for)
return timeout_steps;
udelay(step_us);
--timeout_steps;
} while (timeout_steps);
return 0;
}
int
generic_hub_resetport(usbdev_t *const dev, const int port)
{
generic_hub_t *const hub = GEN_HUB(dev);
if (hub->ops->start_port_reset(dev, port) < 0)
return -1;
/* wait for 10ms (usb20 spec 11.5.1.5: reset should take 10 to 20ms) */
mdelay(10);
/* now wait 12ms for the hub to finish the reset */
const int ret = generic_hub_wait_for_port(
/* time out after 120 * 100us = 12ms */
dev, port, 0, hub->ops->port_in_reset, 120, 100);
if (ret < 0)
return -1;
else if (!ret)
usb_debug("generic_hub: Reset timed out at port %d\n", port);
return 0; /* ignore timeouts, try to always go on */
}
static int
generic_hub_detach_dev(usbdev_t *const dev, const int port)
{
generic_hub_t *const hub = GEN_HUB(dev);
usb_detach_device(dev->controller, hub->ports[port]);
hub->ports[port] = NO_DEV;
return 0;
}
static int
generic_hub_attach_dev(usbdev_t *const dev, const int port)
{
generic_hub_t *const hub = GEN_HUB(dev);
if (generic_hub_debounce(dev, port) < 0)
return -1;
if (hub->ops->reset_port) {
if (hub->ops->reset_port(dev, port) < 0)
return -1;
if (!hub->ops->port_connected(dev, port)) {
usb_debug(
"generic_hub: Port %d disconnected after "
"reset. Possibly upgraded, rescan required.\n",
port);
return 0;
}
/* after reset the port will be enabled automatically */
const int ret = generic_hub_wait_for_port(
/* time out after 1,000 * 10us = 10ms */
dev, port, 1, hub->ops->port_enabled, 1000, 10);
if (ret < 0)
return -1;
else if (!ret)
usb_debug("generic_hub: Port %d still "
"disabled after 10ms\n", port);
}
const usb_speed speed = hub->ops->port_speed(dev, port);
if (speed >= 0) {
usb_debug("generic_hub: Success at port %d\n", port);
if (hub->ops->reset_port)
mdelay(10); /* Reset recovery time
(usb20 spec 7.1.7.5) */
hub->ports[port] = usb_attach_device(
dev->controller, dev->address, port, speed);
}
return 0;
}
int
generic_hub_scanport(usbdev_t *const dev, const int port)
{
generic_hub_t *const hub = GEN_HUB(dev);
if (hub->ports[port] >= 0) {
usb_debug("generic_hub: Detachment at port %d\n", port);
const int ret = generic_hub_detach_dev(dev, port);
if (ret < 0)
return ret;
}
if (hub->ops->port_connected(dev, port)) {
usb_debug("generic_hub: Attachment at port %d\n", port);
return generic_hub_attach_dev(dev, port);
}
return 0;
}
static void
generic_hub_poll(usbdev_t *const dev)
{
generic_hub_t *const hub = GEN_HUB(dev);
if (!hub)
return;
if (!(dev->quirks & USB_QUIRK_HUB_NO_USBSTS_PCD) &&
hub->ops->hub_status_changed &&
hub->ops->hub_status_changed(dev) != 1) {
return;
}
int port;
for (port = 1; port <= hub->num_ports; ++port) {
const int ret = hub->ops->port_status_changed(dev, port);
if (ret < 0) {
return;
} else if (ret == 1) {
usb_debug("generic_hub: Port change at %d\n", port);
if (generic_hub_scanport(dev, port) < 0)
return;
}
}
}
int
generic_hub_init(usbdev_t *const dev, const int num_ports,
const generic_hub_ops_t *const ops)
{
int port;
dev->destroy = generic_hub_destroy;
dev->poll = generic_hub_poll;
dev->data = malloc(sizeof(generic_hub_t));
if (!dev->data) {
usb_debug("generic_hub: ERROR: Out of memory\n");
return -1;
}
generic_hub_t *const hub = GEN_HUB(dev);
hub->num_ports = num_ports;
hub->ports = malloc(sizeof(*hub->ports) * (num_ports + 1));
hub->ops = ops;
if (!hub->ports) {
usb_debug("generic_hub: ERROR: Out of memory\n");
free(dev->data);
dev->data = NULL;
return -1;
}
for (port = 1; port <= num_ports; ++port)
hub->ports[port] = NO_DEV;
/* Enable all ports */
if (ops->enable_port) {
for (port = 1; port <= num_ports; ++port)
ops->enable_port(dev, port);
/* wait once for all ports */
mdelay(20);
}
return 0;
}
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