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usb-vhci-hcd.c
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usb-vhci-hcd.c
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/*
* usb-vhci-hcd.c -- VHCI USB host controller driver.
*
* Copyright (C) 2007-2008 Conemis AG Karlsruhe Germany
* Copyright (C) 2007-2010 Michael Singer <michael@a-singer.de>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
//#define DEBUG
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/delay.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/mutex.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/timer.h>
#include <linux/wait.h>
#include <linux/list.h>
#include <linux/platform_device.h>
#include <linux/usb.h>
#include <linux/fs.h>
#include <linux/device.h>
#include <asm/atomic.h>
#include <asm/bitops.h>
#include <asm/uaccess.h>
#include "usb-vhci-hcd.h"
#define DRIVER_NAME "usb_vhci_hcd"
#define DRIVER_DESC "USB Virtual Host Controller Interface"
#define DRIVER_VERSION USB_VHCI_HCD_VERSION " (" USB_VHCI_HCD_DATE ")"
#ifdef vhci_printk
# undef vhci_printk
#endif
#define vhci_printk(level, fmt, args...) \
printk(level DRIVER_NAME ": " fmt, ## args)
#ifdef vhci_dbg
# undef vhci_dbg
#endif
#ifdef DEBUG
# warning DEBUG is defined
# define vhci_dbg(fmt, args...) \
if(debug_output) vhci_printk(KERN_DEBUG, fmt, ## args)
#else
# define vhci_dbg(fmt, args...) do {} while(0)
#endif
#ifdef trace_function
# undef trace_function
#endif
#ifdef DEBUG
# define trace_function(dev) \
if(debug_output) dev_dbg((dev), "%s%s\n", \
in_interrupt() ? "IN_INTERRUPT: " : "", __FUNCTION__)
#else
# define trace_function(dev) do {} while(0)
#endif
static const char driver_name[] = DRIVER_NAME;
static const char driver_desc[] = DRIVER_DESC;
#ifdef DEBUG
static unsigned int debug_output = 0;
#endif
MODULE_DESCRIPTION(DRIVER_DESC " driver");
MODULE_AUTHOR("Michael Singer <michael@a-singer.de>");
MODULE_LICENSE("GPL");
static inline const char *vhci_dev_name(struct device *dev)
{
#ifdef OLD_DEV_BUS_ID
return dev->bus_id;
#else
return dev_name(dev);
#endif
}
const char *usb_vhci_dev_name(struct usb_vhci_device *vdev)
{
struct platform_device *pdev;
struct usb_vhci_hcd *vhc;
vhc = vhcidev_to_vhcihcd(vdev);
if(likely(vhc))
{
pdev = vhcidev_to_pdev(vdev);
return vhci_dev_name(&pdev->dev);
}
return "<unknown>";
}
EXPORT_SYMBOL_GPL(usb_vhci_dev_name);
int usb_vhci_dev_id(struct usb_vhci_device *vdev)
{
return vhcidev_to_pdev(vdev)->id;
}
EXPORT_SYMBOL_GPL(usb_vhci_dev_id);
int usb_vhci_dev_busnum(struct usb_vhci_device *vdev)
{
return vhcidev_to_usbhcd(vdev)->self.busnum;
}
EXPORT_SYMBOL_GPL(usb_vhci_dev_busnum);
void usb_vhci_maybe_set_status(struct usb_vhci_urb_priv *urbp, int status)
{
#ifdef OLD_GIVEBACK_MECH
struct urb *const urb = urbp->urb;
unsigned long flags;
spin_lock_irqsave(&urb->lock, flags);
if(urb->status == -EINPROGRESS)
urb->status = status;
spin_unlock_irqrestore(&urb->lock, flags);
#else
(void)atomic_cmpxchg(&urbp->status, -EINPROGRESS, status);
#endif
}
EXPORT_SYMBOL_GPL(usb_vhci_maybe_set_status);
#ifdef DEBUG
#include "usb-vhci-dump-urb.c"
#else
static inline void dump_urb(struct urb *urb) {/* do nothing */}
#endif
// caller has vhc->lock
// first port is port# 1 (not 0)
static void vhci_port_update(struct usb_vhci_hcd *vhc, u8 port)
{
struct usb_vhci_device *vdev = vhcihcd_to_vhcidev(vhc);
vhc->port_update |= 1 << port;
vdev->ifc->wakeup(vdev);
}
// gives the urb back to its original owner/creator.
// caller owns vhc->lock and has irq disabled.
void usb_vhci_urb_giveback(struct usb_vhci_hcd *vhc, struct usb_vhci_urb_priv *urbp)
{
struct device *dev;
struct usb_hcd *hcd;
struct urb *const urb = urbp->urb;
struct usb_device *const udev = urb->dev;
#ifndef OLD_GIVEBACK_MECH
int status;
#endif
hcd = vhcihcd_to_usbhcd(vhc);
dev = vhcihcd_to_dev(vhc);
trace_function(dev);
#ifndef OLD_GIVEBACK_MECH
status = atomic_read(&urbp->status);
#endif
urb->hcpriv = NULL;
list_del(&urbp->urbp_list);
#ifndef OLD_GIVEBACK_MECH
usb_hcd_unlink_urb_from_ep(hcd, urb);
#endif
spin_unlock(&vhc->lock);
kfree(urbp);
dump_urb(urb);
#ifdef OLD_GIVEBACK_MECH
usb_hcd_giveback_urb(hcd, urb);
#else
# ifdef DEBUG
if(debug_output) vhci_printk(KERN_DEBUG, "usb_vhci_urb_giveback: status=%d(%s)\n", status, get_status_str(status));
# endif
usb_hcd_giveback_urb(hcd, urb, status);
#endif
usb_put_dev(udev);
spin_lock(&vhc->lock);
}
EXPORT_SYMBOL_GPL(usb_vhci_urb_giveback);
#ifdef OLD_GIVEBACK_MECH
static int vhci_urb_enqueue(struct usb_hcd *hcd, struct usb_host_endpoint *ep, struct urb *urb, gfp_t mem_flags)
#else
static int vhci_urb_enqueue(struct usb_hcd *hcd, struct urb *urb, gfp_t mem_flags)
#endif
{
struct usb_vhci_hcd *vhc;
struct device *dev;
struct usb_vhci_urb_priv *urbp;
struct usb_vhci_device *vdev;
unsigned long flags;
#ifndef OLD_GIVEBACK_MECH
int retval;
#endif
vhc = usbhcd_to_vhcihcd(hcd);
dev = vhcihcd_to_dev(vhc);
vdev = vhcihcd_to_vhcidev(vhc);
trace_function(dev);
if(unlikely(!urb->transfer_buffer && urb->transfer_buffer_length))
return -EINVAL;
urbp = kzalloc(sizeof *urbp, mem_flags);
if(unlikely(!urbp))
return -ENOMEM;
urbp->urb = urb;
atomic_set(&urbp->status, urb->status);
vhci_dbg("vhci_urb_enqueue: urb->status = %d(%s)",urb->status,get_status_str(urb->status));
spin_lock_irqsave(&vhc->lock, flags);
#ifndef OLD_GIVEBACK_MECH
retval = usb_hcd_link_urb_to_ep(hcd, urb);
if(unlikely(retval))
{
kfree(urbp);
spin_unlock_irqrestore(&vhc->lock, flags);
return retval;
}
#endif
usb_get_dev(urb->dev);
list_add_tail(&urbp->urbp_list, &vhc->urbp_list_inbox);
urb->hcpriv = urbp;
spin_unlock_irqrestore(&vhc->lock, flags);
vdev->ifc->wakeup(vdev);
return 0;
}
#ifdef OLD_GIVEBACK_MECH
static int vhci_urb_dequeue(struct usb_hcd *hcd, struct urb *urb)
#else
static int vhci_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status)
#endif
{
struct usb_vhci_hcd *vhc;
struct device *dev;
struct usb_vhci_device *vdev;
unsigned long flags;
struct usb_vhci_urb_priv *entry, *urbp = NULL;
#ifndef OLD_GIVEBACK_MECH
int retval;
#endif
vhc = usbhcd_to_vhcihcd(hcd);
dev = vhcihcd_to_dev(vhc);
vdev = vhcihcd_to_vhcidev(vhc);
trace_function(dev);
spin_lock_irqsave(&vhc->lock, flags);
#ifndef OLD_GIVEBACK_MECH
retval = usb_hcd_check_unlink_urb(hcd, urb, status);
if(retval)
{
spin_unlock_irqrestore(&vhc->lock, flags);
return retval;
}
#endif
// search the queue of unprocessed urbs (inbox)
list_for_each_entry(entry, &vhc->urbp_list_inbox, urbp_list)
{
if(entry->urb == urb)
{
urbp = entry;
break;
}
}
// if found in inbox
if(urbp)
usb_vhci_urb_giveback(vhc, urbp);
else // if not found...
{
// ...then check if the urb is on a vacation through user space
list_for_each_entry(entry, &vhc->urbp_list_fetched, urbp_list)
{
if(entry->urb == urb)
{
// move it into the cancel list
list_move_tail(&entry->urbp_list, &vhc->urbp_list_cancel);
vdev->ifc->wakeup(vdev);
break;
}
}
}
spin_unlock_irqrestore(&vhc->lock, flags);
return 0;
}
/*
static void vhci_timer(unsigned long _vhc)
{
struct usb_vhci_hcd *vhc = (struct usb_vhci_hcd *)_vhc;
}
*/
static int vhci_hub_status(struct usb_hcd *hcd, char *buf)
{
struct usb_vhci_hcd *vhc;
struct device *dev;
unsigned long flags;
u8 port;
int changed = 0;
int idx, rel_bit, abs_bit;
vhc = usbhcd_to_vhcihcd(hcd);
dev = vhcihcd_to_dev(vhc);
trace_function(dev);
memset(buf, 0, 1 + vhc->port_count / 8);
spin_lock_irqsave(&vhc->lock, flags);
if(!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags))
{
spin_unlock_irqrestore(&vhc->lock, flags);
return 0;
}
for(port = 0; port < vhc->port_count; port++)
{
if(vhc->ports[port].port_change)
{
abs_bit = port + 1;
idx = abs_bit / (sizeof *buf * 8);
rel_bit = abs_bit % (sizeof *buf * 8);
buf[idx] |= (1 << rel_bit);
changed = 1;
}
#ifdef DEBUG
if(debug_output) dev_dbg(dev, "port %d status 0x%04x has changes at 0x%04x\n", (int)(port + 1), (int)vhc->ports[port].port_status, (int)vhc->ports[port].port_change);
#endif
}
if(vhc->rh_state == USB_VHCI_RH_SUSPENDED && changed)
usb_hcd_resume_root_hub(hcd);
spin_unlock_irqrestore(&vhc->lock, flags);
return changed;
}
// caller has vhc->lock
// called in vhci_hub_control only
static inline void hub_descriptor(const struct usb_vhci_hcd *vhc, char *buf, u16 len)
{
struct usb_hub_descriptor desc;
int portArrLen = vhc->port_count / 8 + 1; // length of one port bit-array in bytes
u16 l = USB_DT_HUB_NONVAR_SIZE + 2 * portArrLen; // length of our hub descriptor
memset(&desc, 0, USB_DT_HUB_NONVAR_SIZE);
if(likely(len > USB_DT_HUB_NONVAR_SIZE))
{
if(unlikely(len < l)) l = len;
if(likely(l > USB_DT_HUB_NONVAR_SIZE))
{
memset(buf + USB_DT_HUB_NONVAR_SIZE, 0, l - USB_DT_HUB_NONVAR_SIZE);
if(likely(l > USB_DT_HUB_NONVAR_SIZE + portArrLen))
memset(buf + USB_DT_HUB_NONVAR_SIZE + portArrLen, 0xff, l - (USB_DT_HUB_NONVAR_SIZE + portArrLen));
}
}
else l = len;
desc.bDescLength = l;
desc.bDescriptorType = 0x29;
desc.bNbrPorts = vhc->port_count;
desc.wHubCharacteristics = __constant_cpu_to_le16(0x0009); // Per port power and overcurrent
memcpy(buf, &desc, l);
}
static int vhci_hub_control(struct usb_hcd *hcd,
u16 typeReq,
u16 wValue,
u16 wIndex,
char *buf,
u16 wLength)
{
struct usb_vhci_hcd *vhc;
struct device *dev;
int retval = 0;
unsigned long flags;
u16 *ps, *pc;
u8 *pf;
u8 port, has_changes = 0;
vhc = usbhcd_to_vhcihcd(hcd);
dev = vhcihcd_to_dev(vhc);
trace_function(dev);
if(unlikely(!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags)))
return -ETIMEDOUT;
spin_lock_irqsave(&vhc->lock, flags);
switch(typeReq)
{
case ClearHubFeature:
case SetHubFeature:
#ifdef DEBUG
if(debug_output) dev_dbg(dev, "%s: %sHubFeature [wValue=0x%04x]\n", __FUNCTION__, (typeReq == ClearHubFeature) ? "Clear" : "Set", (int)wValue);
#endif
if(unlikely(wIndex || wLength || (wValue != C_HUB_LOCAL_POWER && wValue != C_HUB_OVER_CURRENT)))
goto err;
break;
case ClearPortFeature:
#ifdef DEBUG
if(debug_output) dev_dbg(dev, "%s: ClearPortFeature [wValue=0x%04x, wIndex=%d]\n", __FUNCTION__, (int)wValue, (int)wIndex);
#endif
if(unlikely(!wIndex || wIndex > vhc->port_count || wLength))
goto err;
ps = &vhc->ports[wIndex - 1].port_status;
pc = &vhc->ports[wIndex - 1].port_change;
pf = &vhc->ports[wIndex - 1].port_flags;
switch(wValue)
{
case USB_PORT_FEAT_SUSPEND:
// (see USB 2.0 spec section 11.5 and 11.24.2.7.1.3)
if(*ps & USB_PORT_STAT_SUSPEND)
{
#ifdef DEBUG
if(debug_output) dev_dbg(dev, "Port %d resuming\n", (int)wIndex);
#endif
*pf |= USB_VHCI_PORT_STAT_FLAG_RESUMING;
vhci_port_update(vhc, wIndex);
}
break;
case USB_PORT_FEAT_POWER:
// (see USB 2.0 spec section 11.11 and 11.24.2.7.1.6)
if(*ps & USB_PORT_STAT_POWER)
{
#ifdef DEBUG
if(debug_output) dev_dbg(dev, "Port %d power-off\n", (int)wIndex);
#endif
// clear all status bits except overcurrent (see USB 2.0 spec section 11.24.2.7.1)
*ps &= USB_PORT_STAT_OVERCURRENT;
// clear all change bits except overcurrent (see USB 2.0 spec section 11.24.2.7.2)
*pc &= USB_PORT_STAT_C_OVERCURRENT;
// clear resuming flag
*pf &= ~USB_VHCI_PORT_STAT_FLAG_RESUMING;
vhci_port_update(vhc, wIndex);
}
break;
case USB_PORT_FEAT_ENABLE:
// (see USB 2.0 spec section 11.5.1.4 and 11.24.2.7.{1,2}.2)
if(*ps & USB_PORT_STAT_ENABLE)
{
#ifdef DEBUG
if(debug_output) dev_dbg(dev, "Port %d disabled\n", (int)wIndex);
#endif
// clear enable and suspend bits (see section 11.24.2.7.1.{2,3})
*ps &= ~(USB_PORT_STAT_ENABLE | USB_PORT_STAT_SUSPEND);
// i'm not quite sure if the suspend change bit should be cleared too (see section 11.24.2.7.2.{2,3})
*pc &= ~(USB_PORT_STAT_C_ENABLE | USB_PORT_STAT_C_SUSPEND);
// clear resuming flag
*pf &= ~USB_VHCI_PORT_STAT_FLAG_RESUMING;
// TODO: maybe we should clear the low/high speed bits here (section 11.24.2.7.1.{7,8})
vhci_port_update(vhc, wIndex);
}
break;
case USB_PORT_FEAT_CONNECTION:
case USB_PORT_FEAT_OVER_CURRENT:
case USB_PORT_FEAT_RESET:
case USB_PORT_FEAT_LOWSPEED:
case USB_PORT_FEAT_HIGHSPEED:
case USB_PORT_FEAT_INDICATOR:
break; // no-op
case USB_PORT_FEAT_C_CONNECTION:
case USB_PORT_FEAT_C_ENABLE:
case USB_PORT_FEAT_C_SUSPEND:
case USB_PORT_FEAT_C_OVER_CURRENT:
case USB_PORT_FEAT_C_RESET:
if(*pc & (1 << (wValue - 16)))
{
*pc &= ~(1 << (wValue - 16));
vhci_port_update(vhc, wIndex);
}
break;
//case USB_PORT_FEAT_TEST:
default:
goto err;
}
break;
case GetHubDescriptor:
#ifdef DEBUG
if(debug_output) dev_dbg(dev, "%s: GetHubDescriptor [wValue=0x%04x, wLength=%d]\n", __FUNCTION__, (int)wValue, (int)wLength);
#endif
if(unlikely(wIndex))
goto err;
hub_descriptor(vhc, buf, wLength);
break;
case GetHubStatus:
#ifdef DEBUG
if(debug_output) dev_dbg(dev, "%s: GetHubStatus\n", __FUNCTION__);
#endif
if(unlikely(wValue || wIndex || wLength != 4))
goto err;
buf[0] = buf[1] = buf[2] = buf[3] = 0;
break;
case GetPortStatus:
#ifdef DEBUG
if(debug_output) dev_dbg(dev, "%s: GetPortStatus [wIndex=%d]\n", __FUNCTION__, (int)wIndex);
#endif
if(unlikely(wValue || !wIndex || wIndex > vhc->port_count || wLength != 4))
goto err;
#ifdef DEBUG
if(debug_output) dev_dbg(dev, "%s: ==> [port_status=0x%04x] [port_change=0x%04x]\n", __FUNCTION__, (int)vhc->ports[wIndex - 1].port_status, (int)vhc->ports[wIndex - 1].port_change);
#endif
buf[0] = (u8)vhc->ports[wIndex - 1].port_status;
buf[1] = (u8)(vhc->ports[wIndex - 1].port_status >> 8);
buf[2] = (u8)vhc->ports[wIndex - 1].port_change;
buf[3] = (u8)(vhc->ports[wIndex - 1].port_change >> 8);
break;
case SetPortFeature:
#ifdef DEBUG
if(debug_output) dev_dbg(dev, "%s: SetPortFeature [wValue=0x%04x, wIndex=%d]\n", __FUNCTION__, (int)wValue, (int)wIndex);
#endif
if(unlikely(!wIndex || wIndex > vhc->port_count || wLength))
goto err;
ps = &vhc->ports[wIndex - 1].port_status;
pc = &vhc->ports[wIndex - 1].port_change;
pf = &vhc->ports[wIndex - 1].port_flags;
switch(wValue)
{
case USB_PORT_FEAT_SUSPEND:
// USB 2.0 spec section 11.24.2.7.1.3:
// "This bit can be set only if the port’s PORT_ENABLE bit is set and the hub receives
// a SetPortFeature(PORT_SUSPEND) request."
// The spec also says that the suspend bit has to be cleared whenever the enable bit is cleared.
// (see also section 11.5)
if((*ps & USB_PORT_STAT_ENABLE) && !(*ps & USB_PORT_STAT_SUSPEND))
{
#ifdef DEBUG
if(debug_output) dev_dbg(dev, "Port %d suspended\n", (int)wIndex);
#endif
*ps |= USB_PORT_STAT_SUSPEND;
vhci_port_update(vhc, wIndex);
}
break;
case USB_PORT_FEAT_POWER:
// (see USB 2.0 spec section 11.11 and 11.24.2.7.1.6)
if(!(*ps & USB_PORT_STAT_POWER))
{
#ifdef DEBUG
if(debug_output) dev_dbg(dev, "Port %d power-on\n", (int)wIndex);
#endif
*ps |= USB_PORT_STAT_POWER;
vhci_port_update(vhc, wIndex);
}
break;
case USB_PORT_FEAT_RESET:
// (see USB 2.0 spec section 11.24.2.7.1.5)
// initiate reset only if there is a device plugged into the port and if there isn't already a reset pending
if((*ps & USB_PORT_STAT_CONNECTION) && !(*ps & USB_PORT_STAT_RESET))
{
#ifdef DEBUG
if(debug_output) dev_dbg(dev, "Port %d resetting\n", (int)wIndex);
#endif
// keep the state of these bits and clear all others
*ps &= USB_PORT_STAT_POWER
| USB_PORT_STAT_CONNECTION
| USB_PORT_STAT_LOW_SPEED
| USB_PORT_STAT_HIGH_SPEED
| USB_PORT_STAT_OVERCURRENT;
*ps |= USB_PORT_STAT_RESET; // reset initiated
// clear resuming flag
*pf &= ~USB_VHCI_PORT_STAT_FLAG_RESUMING;
vhci_port_update(vhc, wIndex);
}
#ifdef DEBUG
else if(debug_output) dev_dbg(dev, "Port %d reset not possible because of port_state=%04x\n", (int)wIndex, (int)*ps);
#endif
break;
case USB_PORT_FEAT_CONNECTION:
case USB_PORT_FEAT_OVER_CURRENT:
case USB_PORT_FEAT_LOWSPEED:
case USB_PORT_FEAT_HIGHSPEED:
case USB_PORT_FEAT_INDICATOR:
break; // no-op
case USB_PORT_FEAT_C_CONNECTION:
case USB_PORT_FEAT_C_ENABLE:
case USB_PORT_FEAT_C_SUSPEND:
case USB_PORT_FEAT_C_OVER_CURRENT:
case USB_PORT_FEAT_C_RESET:
if(!(*pc & (1 << (wValue - 16))))
{
*pc |= 1 << (wValue - 16);
vhci_port_update(vhc, wIndex);
}
break;
//case USB_PORT_FEAT_ENABLE: // port can't be enabled without reseting (USB 2.0 spec section 11.24.2.7.1.2)
//case USB_PORT_FEAT_TEST:
default:
goto err;
}
break;
default:
#ifdef DEBUG
if(debug_output) dev_dbg(dev, "%s: +++UNHANDLED_REQUEST+++ [req=0x%04x, v=0x%04x, i=0x%04x, l=%d]\n", __FUNCTION__, (int)typeReq, (int)wValue, (int)wIndex, (int)wLength);
#endif
err:
#ifdef DEBUG
if(debug_output) dev_dbg(dev, "%s: STALL\n", __FUNCTION__);
#endif
// "protocol stall" on error
retval = -EPIPE;
}
for(port = 0; port < vhc->port_count; port++)
if(vhc->ports[port].port_change)
has_changes = 1;
spin_unlock_irqrestore(&vhc->lock, flags);
if(has_changes)
usb_hcd_poll_rh_status(hcd);
return retval;
}
static int vhci_bus_suspend(struct usb_hcd *hcd)
{
struct usb_vhci_hcd *vhc;
struct device *dev;
unsigned long flags;
u8 port;
vhc = usbhcd_to_vhcihcd(hcd);
dev = vhcihcd_to_dev(vhc);
trace_function(dev);
spin_lock_irqsave(&vhc->lock, flags);
// suspend ports
for(port = 0; port < vhc->port_count; port++)
{
if((vhc->ports[port].port_status & USB_PORT_STAT_ENABLE) &&
!(vhc->ports[port].port_status & USB_PORT_STAT_SUSPEND))
{
dev_dbg(dev, "Port %d suspended\n", (int)port + 1);
vhc->ports[port].port_status |= USB_PORT_STAT_SUSPEND;
vhc->ports[port].port_flags &= ~USB_VHCI_PORT_STAT_FLAG_RESUMING;
vhci_port_update(vhc, port + 1);
}
}
// TODO: somehow we have to suppress the resuming of ports while the bus is suspended
vhc->rh_state = USB_VHCI_RH_SUSPENDED;
hcd->state = HC_STATE_SUSPENDED;
spin_unlock_irqrestore(&vhc->lock, flags);
return 0;
}
static int vhci_bus_resume(struct usb_hcd *hcd)
{
struct usb_vhci_hcd *vhc;
struct device *dev;
int rc = 0;
unsigned long flags;
vhc = usbhcd_to_vhcihcd(hcd);
dev = vhcihcd_to_dev(vhc);
trace_function(dev);
spin_lock_irqsave(&vhc->lock, flags);
if(unlikely(!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags)))
{
dev_warn(&hcd->self.root_hub->dev, "HC isn't running! You have to resume the host controller device before you resume the root hub.\n");
rc = -ENODEV;
}
else
{
vhc->rh_state = USB_VHCI_RH_RUNNING;
//set_link_state(vhc);
hcd->state = HC_STATE_RUNNING;
}
spin_unlock_irqrestore(&vhc->lock, flags);
return rc;
}
static inline ssize_t show_urb(char *buf, size_t size, struct urb *urb)
{
int ep = usb_pipeendpoint(urb->pipe);
return snprintf(buf, size,
"urb/%p %s ep%d%s%s len %d/%d\n",
urb,
({
char *s;
switch(urb->dev->speed)
{
case USB_SPEED_LOW: s = "ls"; break;
case USB_SPEED_FULL: s = "fs"; break;
case USB_SPEED_HIGH: s = "hs"; break;
default: s = "?"; break;
};
s;
}),
ep, ep ? (usb_pipein(urb->pipe) ? "in" : "out") : "",
({
char *s;
switch(usb_pipetype(urb->pipe))
{
case PIPE_CONTROL: s = ""; break;
case PIPE_BULK: s = "-bulk"; break;
case PIPE_INTERRUPT: s = "-int"; break;
default: s = "-iso"; break;
};
s;
}),
urb->actual_length, urb->transfer_buffer_length);
}
static ssize_t show_urbs(struct device *dev, struct device_attribute *attr, char *buf);
static DEVICE_ATTR(urbs_inbox, S_IRUSR, show_urbs, NULL);
static DEVICE_ATTR(urbs_fetched, S_IRUSR, show_urbs, NULL);
static DEVICE_ATTR(urbs_cancel, S_IRUSR, show_urbs, NULL);
static DEVICE_ATTR(urbs_canceling, S_IRUSR, show_urbs, NULL);
static ssize_t show_urbs(struct device *dev, struct device_attribute *attr, char *buf)
{
struct usb_vhci_hcd *vhc;
struct platform_device *pdev;
struct usb_vhci_urb_priv *urbp;
size_t size = 0;
unsigned long flags;
struct list_head *list;
pdev = to_platform_device(dev);
vhc = pdev_to_vhcihcd(pdev);
trace_function(dev);
if(attr == &dev_attr_urbs_inbox)
list = &vhc->urbp_list_inbox;
else if(attr == &dev_attr_urbs_fetched)
list = &vhc->urbp_list_fetched;
else if(attr == &dev_attr_urbs_cancel)
list = &vhc->urbp_list_cancel;
else if(attr == &dev_attr_urbs_canceling)
list = &vhc->urbp_list_canceling;
else
{
dev_err(dev, "unreachable code reached... wtf?\n");
return -EINVAL;
}
spin_lock_irqsave(&vhc->lock, flags);
list_for_each_entry(urbp, list, urbp_list)
{
size_t temp;
temp = PAGE_SIZE - size;
if(unlikely(temp <= 0)) break;
temp = show_urb(buf, temp, urbp->urb);
buf += temp;
size += temp;
}
spin_unlock_irqrestore(&vhc->lock, flags);
return size;
}
static int vhci_start(struct usb_hcd *hcd)
{
struct usb_vhci_hcd *vhc;
int retval;
struct usb_vhci_port *ports;
struct usb_vhci_device *vdev;
struct device *dev;
dev = usbhcd_to_dev(hcd);
trace_function(dev);
vhc = usbhcd_to_vhcihcd(hcd);
vdev = vhcihcd_to_vhcidev(vhc);
ports = kzalloc(vdev->port_count * sizeof(struct usb_vhci_port), GFP_KERNEL);
if(unlikely(ports == NULL)) return -ENOMEM;
spin_lock_init(&vhc->lock);
//init_timer(&vhc->timer);
//vhc->timer.function = vhci_timer;
//vhc->timer.data = (unsigned long)vhc;
vhc->ports = ports;
vhc->port_count = vdev->port_count;
vhc->port_update = 0;
atomic_set(&vhc->frame_num, 0);
INIT_LIST_HEAD(&vhc->urbp_list_inbox);
INIT_LIST_HEAD(&vhc->urbp_list_fetched);
INIT_LIST_HEAD(&vhc->urbp_list_cancel);
INIT_LIST_HEAD(&vhc->urbp_list_canceling);
vhc->rh_state = USB_VHCI_RH_RUNNING;
hcd->power_budget = 500; // NOTE: practically we have unlimited power because this is a virtual device with... err... virtual power!
hcd->state = HC_STATE_RUNNING;
hcd->uses_new_polling = 1;
#ifndef NO_HAS_TT_FLAG
hcd->has_tt = 1;
#endif
retval = device_create_file(dev, &dev_attr_urbs_inbox);
if(unlikely(retval != 0)) goto kfree_port_arr;
retval = device_create_file(dev, &dev_attr_urbs_fetched);
if(unlikely(retval != 0)) goto rem_file_inbox;
retval = device_create_file(dev, &dev_attr_urbs_cancel);
if(unlikely(retval != 0)) goto rem_file_fetched;
retval = device_create_file(dev, &dev_attr_urbs_canceling);
if(unlikely(retval != 0)) goto rem_file_cancel;
return 0;
rem_file_cancel:
device_remove_file(dev, &dev_attr_urbs_cancel);
rem_file_fetched:
device_remove_file(dev, &dev_attr_urbs_fetched);
rem_file_inbox:
device_remove_file(dev, &dev_attr_urbs_inbox);
kfree_port_arr:
kfree(ports);
vhc->ports = NULL;
vhc->port_count = 0;
return retval;
}
static void vhci_stop(struct usb_hcd *hcd)
{
struct usb_vhci_hcd *vhc;
struct device *dev;
dev = usbhcd_to_dev(hcd);
trace_function(dev);
vhc = usbhcd_to_vhcihcd(hcd);
device_remove_file(dev, &dev_attr_urbs_canceling);
device_remove_file(dev, &dev_attr_urbs_cancel);
device_remove_file(dev, &dev_attr_urbs_fetched);
device_remove_file(dev, &dev_attr_urbs_inbox);
if(likely(vhc->ports))
{
kfree(vhc->ports);
vhc->ports = NULL;
vhc->port_count = 0;
}
vhc->rh_state = USB_VHCI_RH_RESET;
dev_info(dev, "stopped\n");
}
static int vhci_get_frame(struct usb_hcd *hcd)
{
struct usb_vhci_hcd *vhc;
vhc = usbhcd_to_vhcihcd(hcd);
trace_function(usbhcd_to_dev(hcd));
return atomic_read(&vhc->frame_num);
}
static const struct hc_driver vhci_hcd = {
.description = driver_name,
.product_desc = "VHCI Host Controller",
.hcd_priv_size = sizeof(struct usb_vhci_hcd),
.flags = HCD_USB2,
.start = vhci_start,
.stop = vhci_stop,
.urb_enqueue = vhci_urb_enqueue,
.urb_dequeue = vhci_urb_dequeue,
.get_frame_number = vhci_get_frame,
.hub_status_data = vhci_hub_status,
.hub_control = vhci_hub_control,
.bus_suspend = vhci_bus_suspend,
.bus_resume = vhci_bus_resume
};
static int vhci_hcd_probe(struct platform_device *pdev)
{
struct usb_hcd *hcd;
struct usb_vhci_device *vdev;
int retval;
vdev = pdev_to_vhcidev(pdev);
#ifdef DEBUG
if(debug_output) dev_dbg(&pdev->dev, "%s\n", __FUNCTION__);
#endif
dev_info(&pdev->dev, DRIVER_DESC " -- Version " DRIVER_VERSION "\n");
dev_info(&pdev->dev, "--> Backend: %s\n", vdev->ifc->ifc_desc);
hcd = usb_create_hcd(&vhci_hcd, &pdev->dev, vhci_dev_name(&pdev->dev));
if(unlikely(!hcd)) return -ENOMEM;
vdev->vhc = usbhcd_to_vhcihcd(hcd);
retval = usb_add_hcd(hcd, 0, 0); // calls vhci_start
if(unlikely(retval)) usb_put_hcd(hcd);
return retval;
}
static int vhci_hcd_remove(struct platform_device *pdev)
{
unsigned long flags;
struct usb_hcd *hcd;
struct usb_vhci_hcd *vhc;
struct usb_vhci_urb_priv *urbp;
struct usb_vhci_device *vdev;
vdev = pdev_to_vhcidev(pdev);
vhc = vhcidev_to_vhcihcd(vdev);
hcd = vhcidev_to_usbhcd(vdev);
trace_function(vhcihcd_to_dev(vhc));
spin_lock_irqsave(&vhc->lock, flags);
while(!list_empty(&vhc->urbp_list_inbox))
{
urbp = list_entry(vhc->urbp_list_inbox.next, struct usb_vhci_urb_priv, urbp_list);
usb_vhci_maybe_set_status(urbp, -ESHUTDOWN);
usb_vhci_urb_giveback(vhc, urbp);
}
while(!list_empty(&vhc->urbp_list_fetched))
{
urbp = list_entry(vhc->urbp_list_fetched.next, struct usb_vhci_urb_priv, urbp_list);
usb_vhci_maybe_set_status(urbp, -ESHUTDOWN);
usb_vhci_urb_giveback(vhc, urbp);
}
while(!list_empty(&vhc->urbp_list_cancel))
{
urbp = list_entry(vhc->urbp_list_cancel.next, struct usb_vhci_urb_priv, urbp_list);
usb_vhci_maybe_set_status(urbp, -ESHUTDOWN);
usb_vhci_urb_giveback(vhc, urbp);
}
while(!list_empty(&vhc->urbp_list_canceling))
{
urbp = list_entry(vhc->urbp_list_canceling.next, struct usb_vhci_urb_priv, urbp_list);
usb_vhci_maybe_set_status(urbp, -ESHUTDOWN);
usb_vhci_urb_giveback(vhc, urbp);
}
spin_unlock_irqrestore(&vhc->lock, flags);
usb_remove_hcd(hcd); // calls vhci_stop
usb_put_hcd(hcd);
vdev->vhc = NULL;
if(vdev->ifc->destroy)
{
vhci_dbg("call ifc->destroy\n");
vdev->ifc->destroy(vhcidev_to_ifc(vdev));
}
return 0;
}
static int vhci_hcd_suspend(struct platform_device *pdev, pm_message_t state)
{
struct usb_hcd *hcd;
struct usb_vhci_hcd *vhc;
int rc = 0;
vhc = pdev_to_vhcihcd(pdev);
hcd = vhcihcd_to_usbhcd(vhc);
trace_function(vhcihcd_to_dev(vhc));
if(unlikely(vhc->rh_state == USB_VHCI_RH_RUNNING))
{