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// Code for handling standard USB hubs.
//
// Copyright (C) 2010 Kevin O'Connor <kevin@koconnor.net>
//
// This file may be distributed under the terms of the GNU LGPLv3 license.
#include "util.h" // dprintf
#include "config.h" // CONFIG_USB_HUB
#include "usb-hub.h" // struct usb_hub_descriptor
#include "usb.h" // struct usb_s
static int
get_hub_desc(struct usb_pipe *pipe, struct usb_hub_descriptor *desc)
{
struct usb_ctrlrequest req;
req.bRequestType = USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_DEVICE;
req.bRequest = USB_REQ_GET_DESCRIPTOR;
req.wValue = USB_DT_HUB<<8;
req.wIndex = 0;
req.wLength = sizeof(*desc);
return send_default_control(pipe, &req, desc);
}
static int
set_port_feature(struct usbhub_s *hub, int port, int feature)
{
struct usb_ctrlrequest req;
req.bRequestType = USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_OTHER;
req.bRequest = USB_REQ_SET_FEATURE;
req.wValue = feature;
req.wIndex = port + 1;
req.wLength = 0;
mutex_lock(&hub->lock);
int ret = send_default_control(hub->usbdev->defpipe, &req, NULL);
mutex_unlock(&hub->lock);
return ret;
}
static int
clear_port_feature(struct usbhub_s *hub, int port, int feature)
{
struct usb_ctrlrequest req;
req.bRequestType = USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_OTHER;
req.bRequest = USB_REQ_CLEAR_FEATURE;
req.wValue = feature;
req.wIndex = port + 1;
req.wLength = 0;
mutex_lock(&hub->lock);
int ret = send_default_control(hub->usbdev->defpipe, &req, NULL);
mutex_unlock(&hub->lock);
return ret;
}
static int
get_port_status(struct usbhub_s *hub, int port, struct usb_port_status *sts)
{
struct usb_ctrlrequest req;
req.bRequestType = USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_OTHER;
req.bRequest = USB_REQ_GET_STATUS;
req.wValue = 0;
req.wIndex = port + 1;
req.wLength = sizeof(*sts);
mutex_lock(&hub->lock);
int ret = send_default_control(hub->usbdev->defpipe, &req, sts);
mutex_unlock(&hub->lock);
return ret;
}
// Check if device attached to port
static int
usb_hub_detect(struct usbhub_s *hub, u32 port)
{
// Turn on power to port.
int ret = set_port_feature(hub, port, USB_PORT_FEAT_POWER);
if (ret)
goto fail;
// Wait for port power to stabilize.
msleep(hub->powerwait);
// Check periodically for a device connect.
struct usb_port_status sts;
u64 end = calc_future_tsc(USB_TIME_SIGATT);
for (;;) {
ret = get_port_status(hub, port, &sts);
if (ret)
goto fail;
if (sts.wPortStatus & USB_PORT_STAT_CONNECTION)
// Device connected.
break;
if (check_tsc(end))
// No device found.
return -1;
msleep(5);
}
// XXX - wait USB_TIME_ATTDB time?
return 0;
fail:
dprintf(1, "Failure on hub port %d detect\n", port);
return -1;
}
// Disable port
static void
usb_hub_disconnect(struct usbhub_s *hub, u32 port)
{
int ret = clear_port_feature(hub, port, USB_PORT_FEAT_ENABLE);
if (ret)
dprintf(1, "Failure on hub port %d disconnect\n", port);
}
// Reset device on port
static int
usb_hub_reset(struct usbhub_s *hub, u32 port)
{
int ret = set_port_feature(hub, port, USB_PORT_FEAT_RESET);
if (ret)
goto fail;
// Wait for reset to complete.
struct usb_port_status sts;
u64 end = calc_future_tsc(USB_TIME_DRST * 2);
for (;;) {
ret = get_port_status(hub, port, &sts);
if (ret)
goto fail;
if (!(sts.wPortStatus & USB_PORT_STAT_RESET))
break;
if (check_tsc(end)) {
warn_timeout();
goto fail;
}
msleep(5);
}
// Reset complete.
if (!(sts.wPortStatus & USB_PORT_STAT_CONNECTION))
// Device no longer present
return -1;
return ((sts.wPortStatus & USB_PORT_STAT_SPEED_MASK)
>> USB_PORT_STAT_SPEED_SHIFT);
fail:
dprintf(1, "Failure on hub port %d reset\n", port);
usb_hub_disconnect(hub, port);
return -1;
}
static struct usbhub_op_s HubOp = {
.detect = usb_hub_detect,
.reset = usb_hub_reset,
.disconnect = usb_hub_disconnect,
};
// Configure a usb hub and then find devices connected to it.
int
usb_hub_setup(struct usbdevice_s *usbdev)
{
ASSERT32FLAT();
if (!CONFIG_USB_HUB)
return -1;
struct usb_hub_descriptor desc;
int ret = get_hub_desc(usbdev->defpipe, &desc);
if (ret)
return ret;
struct usbhub_s hub;
memset(&hub, 0, sizeof(hub));
hub.usbdev = usbdev;
hub.cntl = usbdev->defpipe->cntl;
hub.powerwait = desc.bPwrOn2PwrGood * 2;
hub.portcount = desc.bNbrPorts;
hub.op = &HubOp;
usb_enumerate(&hub);
dprintf(1, "Initialized USB HUB (%d ports used)\n", hub.devcount);
if (hub.devcount)
return 0;
return -1;
}
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