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path: root/drivers/usb/host/uhci-hub.c
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Diffstat (limited to 'drivers/usb/host/uhci-hub.c')
-rw-r--r--drivers/usb/host/uhci-hub.c83
1 files changed, 79 insertions, 4 deletions
diff --git a/drivers/usb/host/uhci-hub.c b/drivers/usb/host/uhci-hub.c
index 4c45ba8390f..4eace2b19dd 100644
--- a/drivers/usb/host/uhci-hub.c
+++ b/drivers/usb/host/uhci-hub.c
@@ -33,9 +33,24 @@ static __u8 root_hub_hub_des[] =
/* status change bits: nonzero writes will clear */
#define RWC_BITS (USBPORTSC_OCC | USBPORTSC_PEC | USBPORTSC_CSC)
-static int uhci_hub_status_data(struct usb_hcd *hcd, char *buf)
+/* A port that either is connected or has a changed-bit set will prevent
+ * us from AUTO_STOPPING.
+ */
+static int any_ports_active(struct uhci_hcd *uhci)
+{
+ int port;
+
+ for (port = 0; port < uhci->rh_numports; ++port) {
+ if ((inw(uhci->io_addr + USBPORTSC1 + port * 2) &
+ (USBPORTSC_CCS | RWC_BITS)) ||
+ test_bit(port, &uhci->port_c_suspend))
+ return 1;
+ }
+ return 0;
+}
+
+static inline int get_hub_status_data(struct uhci_hcd *uhci, char *buf)
{
- struct uhci_hcd *uhci = hcd_to_uhci(hcd);
int port;
*buf = 0;
@@ -44,8 +59,6 @@ static int uhci_hub_status_data(struct usb_hcd *hcd, char *buf)
test_bit(port, &uhci->port_c_suspend))
*buf |= (1 << (port + 1));
}
- if (*buf && uhci->state == UHCI_SUSPENDED)
- uhci->resume_detect = 1;
return !!*buf;
}
@@ -115,6 +128,11 @@ static void uhci_check_ports(struct uhci_hcd *uhci)
set_bit(port, &uhci->resuming_ports);
uhci->ports_timeout = jiffies +
msecs_to_jiffies(20);
+
+ /* Make sure we see the port again
+ * after the resuming period is over. */
+ mod_timer(&uhci_to_hcd(uhci)->rh_timer,
+ uhci->ports_timeout);
} else if (time_after_eq(jiffies,
uhci->ports_timeout)) {
uhci_finish_suspend(uhci, port, port_addr);
@@ -123,6 +141,60 @@ static void uhci_check_ports(struct uhci_hcd *uhci)
}
}
+static int uhci_hub_status_data(struct usb_hcd *hcd, char *buf)
+{
+ struct uhci_hcd *uhci = hcd_to_uhci(hcd);
+ unsigned long flags;
+ int status;
+
+ spin_lock_irqsave(&uhci->lock, flags);
+ if (uhci->hc_inaccessible) {
+ status = 0;
+ goto done;
+ }
+
+ uhci_check_ports(uhci);
+ status = get_hub_status_data(uhci, buf);
+
+ switch (uhci->rh_state) {
+ case UHCI_RH_SUSPENDING:
+ case UHCI_RH_SUSPENDED:
+ /* if port change, ask to be resumed */
+ if (status)
+ usb_hcd_resume_root_hub(hcd);
+ break;
+
+ case UHCI_RH_AUTO_STOPPED:
+ /* if port change, auto start */
+ if (status)
+ wakeup_rh(uhci);
+ break;
+
+ case UHCI_RH_RUNNING:
+ /* are any devices attached? */
+ if (!any_ports_active(uhci)) {
+ uhci->rh_state = UHCI_RH_RUNNING_NODEVS;
+ uhci->auto_stop_time = jiffies + HZ;
+ }
+ break;
+
+ case UHCI_RH_RUNNING_NODEVS:
+ /* auto-stop if nothing connected for 1 second */
+ if (any_ports_active(uhci))
+ uhci->rh_state = UHCI_RH_RUNNING;
+ else if (time_after_eq(jiffies, uhci->auto_stop_time))
+ suspend_rh(uhci, UHCI_RH_AUTO_STOPPED);
+ break;
+
+ default:
+ break;
+ }
+
+done:
+ spin_unlock_irqrestore(&uhci->lock, flags);
+ return status;
+}
+
/* size of returned buffer is part of USB spec */
static int uhci_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
u16 wIndex, char *buf, u16 wLength)
@@ -134,6 +206,9 @@ static int uhci_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
u16 wPortChange, wPortStatus;
unsigned long flags;
+ if (uhci->hc_inaccessible)
+ return -ETIMEDOUT;
+
spin_lock_irqsave(&uhci->lock, flags);
switch (typeReq) {