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[PATCH] usb_interface power state

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This updates the handling of power state for USB interfaces.

  - Formalizes an existing invariant:  interface "power state" is a boolean:
    ON when I/O is allowed, and FREEZE otherwise.  It does so by defining
    some inlined helpers, then using them.

  - Adds a useful invariant:  the only interfaces marked active are those
    bound to non-suspended drivers.  Later patches build on this invariant.

  - Simplifies the interface driver API (and removes some error paths) by
    removing the requirement that they record power state changes during
    suspend and resume callbacks.  Now usbcore does that.

A few drivers were simplified to address that last change.

Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

 drivers/usb/core/hub.c       |   33 +++++++++------------
 drivers/usb/core/message.c   |    1
 drivers/usb/core/usb.c       |   65 +++++++++++++++++++++++++++++++++----------
 drivers/usb/core/usb.h       |   18 +++++++++++
 drivers/usb/input/hid-core.c |    2 -
 drivers/usb/misc/usbtest.c   |   10 ------
 drivers/usb/net/pegasus.c    |    2 -
 drivers/usb/net/usbnet.c     |    2 -
 8 files changed, 85 insertions(+), 48 deletions(-)
This commit is contained in:
David Brownell
2005-09-13 19:56:33 -07:00
committed by Greg Kroah-Hartman
parent 7586269c0b
commit db69087437
8 changed files with 85 additions and 48 deletions
Download Patch File Download Diff File Expand all files Collapse all files

33
drivers/usb/core/hub.c
View File

@@ -1624,7 +1624,7 @@ static int __usb_suspend_device (struct usb_device *udev, int port1,
struct usb_driver *driver;
intf = udev->actconfig->interface[i];
if (state.event <= intf->dev.power.power_state.event)
if (!is_active(intf))
continue;
if (!intf->dev.driver)
continue;
@@ -1632,11 +1632,12 @@ static int __usb_suspend_device (struct usb_device *udev, int port1,
if (driver->suspend) {
status = driver->suspend(intf, state);
if (intf->dev.power.power_state.event != state.event
|| status)
if (status == 0)
mark_quiesced(intf);
else
dev_err(&intf->dev,
"suspend %d fail, code %d\n",
state.event, status);
"suspend error %d\n",
status);
}
/* only drivers with suspend() can ever resume();
@@ -1787,7 +1788,7 @@ static int finish_port_resume(struct usb_device *udev)
struct usb_driver *driver;
intf = udev->actconfig->interface[i];
if (intf->dev.power.power_state.event == PM_EVENT_ON)
if (is_active(intf))
continue;
if (!intf->dev.driver) {
/* FIXME maybe force to alt 0 */
@@ -1800,12 +1801,14 @@ static int finish_port_resume(struct usb_device *udev)
continue;
/* can we do better than just logging errors? */
mark_active(intf);
status = driver->resume(intf);
if (intf->dev.power.power_state.event != PM_EVENT_ON
|| status)
if (status < 0) {
mark_quiesced(intf);
dev_dbg(&intf->dev,
"resume fail, state %d code %d\n",
intf->dev.power.power_state.event, status);
"resume error %d\n",
status);
}
}
status = 0;
@@ -1952,7 +1955,7 @@ static int remote_wakeup(struct usb_device *udev)
return status;
}
static int hub_suspend(struct usb_interface *intf, pm_message_t state)
static int hub_suspend(struct usb_interface *intf, pm_message_t msg)
{
struct usb_hub *hub = usb_get_intfdata (intf);
struct usb_device *hdev = hub->hdev;
@@ -1970,14 +1973,13 @@ static int hub_suspend(struct usb_interface *intf, pm_message_t state)
if (!udev)
continue;
down(&udev->serialize);
status = __usb_suspend_device(udev, port1, state);
status = __usb_suspend_device(udev, port1, msg);
up(&udev->serialize);
if (status < 0)
dev_dbg(&intf->dev, "suspend port %d --> %d\n",
port1, status);
}
intf->dev.power.power_state = state;
return 0;
}
@@ -1988,9 +1990,6 @@ static int hub_resume(struct usb_interface *intf)
unsigned port1;
int status;
if (intf->dev.power.power_state.event == PM_EVENT_ON)
return 0;
for (port1 = 1; port1 <= hdev->maxchild; port1++) {
struct usb_device *udev;
u16 portstat, portchange;
@@ -2024,8 +2023,6 @@ static int hub_resume(struct usb_interface *intf)
}
up(&udev->serialize);
}
intf->dev.power.power_state = PMSG_ON;
hub->resume_root_hub = 0;
hub_activate(hub);
return 0;