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