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define platform wakeup hook, use in pci_enable_wake()

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This defines a platform hook to enable/disable a device as a wakeup event
source.  It's initially for use with ACPI, but more generally it could be used
whenever enable_irq_wake()/disable_irq_wake() don't suffice.

The hook is called -- if available -- inside pci_enable_wake(); and the
semantics of that call are enhanced so that support for PCI PME# is no longer
needed.  It can now work for devices with "legacy PCI PM", when platform
support allows it.  (That support would use some board-specific signal for for
the same purpose as PME#.)

[akpm@linux-foundation.org: Make it compile with CONFIG_PM=n]
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Zhang Rui <rui.zhang@intel.com>
Cc: Len Brown <lenb@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
David Brownell
2007-04-26 00:12:06 -07:00
committed by Greg Kroah-Hartman
parent 057f6c019f
commit 075c177152
3 changed files with 63 additions and 17 deletions
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58
drivers/pci/pci.c
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@@ -13,6 +13,7 @@
#include <linux/delay.h>
#include <linux/init.h>
#include <linux/pci.h>
#include <linux/pm.h>
#include <linux/module.h>
#include <linux/spinlock.h>
#include <linux/string.h>
@@ -891,31 +892,48 @@ pci_disable_device(struct pci_dev *dev)
}
/**
* pci_enable_wake - enable device to generate PME# when suspended
* @dev: - PCI device to operate on
* @state: - Current state of device.
* @enable: - Flag to enable or disable generation
*
* Set the bits in the device's PM Capabilities to generate PME# when
* the system is suspended.
* pci_enable_wake - enable PCI device as wakeup event source
* @dev: PCI device affected
* @state: PCI state from which device will issue wakeup events
* @enable: True to enable event generation; false to disable
*
* -EIO is returned if device doesn't have PM Capabilities.
* -EINVAL is returned if device supports it, but can't generate wake events.
* 0 if operation is successful.
*
* This enables the device as a wakeup event source, or disables it.
* When such events involves platform-specific hooks, those hooks are
* called automatically by this routine.
*
* Devices with legacy power management (no standard PCI PM capabilities)
* always require such platform hooks. Depending on the platform, devices
* supporting the standard PCI PME# signal may require such platform hooks;
* they always update bits in config space to allow PME# generation.
*
* -EIO is returned if the device can't ever be a wakeup event source.
* -EINVAL is returned if the device can't generate wakeup events from
* the specified PCI state. Returns zero if the operation is successful.
*/
int pci_enable_wake(struct pci_dev *dev, pci_power_t state, int enable)
{
int pm;
int status;
u16 value;
/* Note that drivers should verify device_may_wakeup(&dev->dev)
* before calling this function. Platform code should report
* errors when drivers try to enable wakeup on devices that
* can't issue wakeups, or on which wakeups were disabled by
* userspace updating the /sys/devices.../power/wakeup file.
*/
status = call_platform_enable_wakeup(&dev->dev, enable);
/* find PCI PM capability in list */
pm = pci_find_capability(dev, PCI_CAP_ID_PM);
/* If device doesn't support PM Capabilities, but request is to disable
* wake events, it's a nop; otherwise fail */
if (!pm)
return enable ? -EIO : 0;
/* If device doesn't support PM Capabilities, but caller wants to
* disable wake events, it's a NOP. Otherwise fail unless the
* platform hooks handled this legacy device already.
*/
if (!pm)
return enable ? status : 0;
/* Check device's ability to generate PME# */
pci_read_config_word(dev,pm+PCI_PM_PMC,&value);
@@ -924,8 +942,14 @@ int pci_enable_wake(struct pci_dev *dev, pci_power_t state, int enable)
value >>= ffs(PCI_PM_CAP_PME_MASK) - 1; /* First bit of mask */
/* Check if it can generate PME# from requested state. */
if (!value || !(value & (1 << state)))
if (!value || !(value & (1 << state))) {
/* if it can't, revert what the platform hook changed,
* always reporting the base "EINVAL, can't PME#" error
*/
if (enable)
call_platform_enable_wakeup(&dev->dev, 0);
return enable ? -EINVAL : 0;
}
pci_read_config_word(dev, pm + PCI_PM_CTRL, &value);
@@ -936,7 +960,7 @@ int pci_enable_wake(struct pci_dev *dev, pci_power_t state, int enable)
value &= ~PCI_PM_CTRL_PME_ENABLE;
pci_write_config_word(dev, pm + PCI_PM_CTRL, value);
return 0;
}