From: Rafael J. Wysocki <rjw@xxxxxxx>
PCI ACPI: Introduce can_wakeup platform callback
Introduce function acpi_bus_can_wakeup() allowing other (dependent)
subsystems to check if ACPI is able to enable the system wake-up
capability of given device.
Introduce callback .can_wakeup() in struct pci_platform_pm_ops and
for the ACPI 'driver' make it use acpi_bus_can_wakeup().
Signed-off-by: Rafael J. Wysocki <rjw@xxxxxxx>
---
drivers/acpi/bus.c | 11 +++++++++++
drivers/pci/pci-acpi.c | 8 ++++++++
drivers/pci/pci.c | 11 ++++++++---
drivers/pci/pci.h | 4 ++++
include/acpi/acpi_bus.h | 1 +
5 files changed, 32 insertions(+), 3 deletions(-)
Index: linux-next/drivers/pci/pci.h
===================================================================
--- linux-next.orig/drivers/pci/pci.h
+++ linux-next/drivers/pci/pci.h
@@ -17,6 +17,9 @@ extern void pci_cleanup_rom(struct pci_d
* platform; to be used during system-wide transitions from a
* sleeping state to the working state and vice versa
*
+ * @can_wakeup - returns 'true' if given device is capable of waking up the
+ * system from a sleeping state
+ *
* @sleep_wake - enables/disables the system wake up capability of given device
*
* If given platform is generally capable of power managing PCI devices, all of
@@ -26,6 +29,7 @@ struct pci_platform_pm_ops {
bool (*is_manageable)(struct pci_dev *dev);
int (*set_state)(struct pci_dev *dev, pci_power_t state);
pci_power_t (*choose_state)(struct pci_dev *dev);
+ bool (*can_wakeup)(struct pci_dev *dev);
int (*sleep_wake)(struct pci_dev *dev, bool enable);
};
Index: linux-next/drivers/pci/pci.c
===================================================================
--- linux-next.orig/drivers/pci/pci.c
+++ linux-next/drivers/pci/pci.c
@@ -381,7 +381,7 @@ static struct pci_platform_pm_ops *pci_p
int pci_set_platform_pm(struct pci_platform_pm_ops *ops)
{
if (!ops->is_manageable || !ops->set_state || !ops->choose_state
- || !ops->sleep_wake)
+ || !ops->sleep_wake || !ops->can_wakeup)
return -EINVAL;
pci_platform_pm = ops;
return 0;
@@ -404,6 +404,11 @@ static inline pci_power_t platform_pci_c
pci_platform_pm->choose_state(dev) : PCI_POWER_ERROR;
}
+static inline bool platform_pci_can_wakeup(struct pci_dev *dev)
+{
+ return pci_platform_pm ? pci_platform_pm->can_wakeup(dev) : false;
+}
+
static inline int platform_pci_sleep_wake(struct pci_dev *dev, bool enable)
{
return pci_platform_pm ?
@@ -1068,7 +1073,7 @@ int pci_enable_wake(struct pci_dev *dev,
u16 value = 0;
bool platform_done = false;
- if (enable && platform_pci_power_manageable(dev)) {
+ if (enable && platform_pci_can_wakeup(dev)) {
/* Allow the platform to handle the device */
int err = platform_pci_sleep_wake(dev, true);
if (!err)
@@ -1121,7 +1126,7 @@ int pci_enable_wake(struct pci_dev *dev,
pci_write_config_word(dev, pm + PCI_PM_CTRL, value);
Platform_disable:
- if (!enable && platform_pci_power_manageable(dev)) {
+ if (!enable && platform_pci_can_wakeup(dev)) {
/* Allow the platform to finalize the operation */
int err = platform_pci_sleep_wake(dev, false);
if (err && !value)
Index: linux-next/drivers/acpi/bus.c
===================================================================
--- linux-next.orig/drivers/acpi/bus.c
+++ linux-next/drivers/acpi/bus.c
@@ -306,6 +306,17 @@ bool acpi_bus_power_manageable(acpi_hand
EXPORT_SYMBOL(acpi_bus_power_manageable);
+bool acpi_bus_can_wakeup(acpi_handle handle)
+{
+ struct acpi_device *device;
+ int result;
+
+ result = acpi_bus_get_device(handle, &device);
+ return result ? false : device->wakeup.flags.valid;
+}
+
+EXPORT_SYMBOL(acpi_bus_can_wakeup);
+
/* --------------------------------------------------------------------------
Event Management
-------------------------------------------------------------------------- */
Index: linux-next/drivers/pci/pci-acpi.c
===================================================================
--- linux-next.orig/drivers/pci/pci-acpi.c
+++ linux-next/drivers/pci/pci-acpi.c
@@ -299,6 +299,13 @@ static int acpi_pci_set_power_state(stru
return error;
}
+static bool acpi_pci_can_wakeup(struct pci_dev *dev)
+{
+ acpi_handle handle = DEVICE_ACPI_HANDLE(&dev->dev);
+
+ return handle ? acpi_bus_can_wakeup(handle) : false;
+}
+
static int acpi_pci_sleep_wake(struct pci_dev *dev, bool enable)
{
int error = acpi_pm_device_sleep_wake(&dev->dev, enable);
@@ -313,6 +320,7 @@ static struct pci_platform_pm_ops acpi_p
.is_manageable = acpi_pci_power_manageable,
.set_state = acpi_pci_set_power_state,
.choose_state = acpi_pci_choose_state,
+ .can_wakeup = acpi_pci_can_wakeup,
.sleep_wake = acpi_pci_sleep_wake,
};
Index: linux-next/include/acpi/acpi_bus.h
===================================================================
--- linux-next.orig/include/acpi/acpi_bus.h
+++ linux-next/include/acpi/acpi_bus.h
@@ -337,6 +337,7 @@ int acpi_bus_get_status(struct acpi_devi
int acpi_bus_get_power(acpi_handle handle, int *state);
int acpi_bus_set_power(acpi_handle handle, int state);
bool acpi_bus_power_manageable(acpi_handle handle);
+bool acpi_bus_can_wakeup(acpi_handle handle);
#ifdef CONFIG_ACPI_PROC_EVENT
int acpi_bus_generate_proc_event(struct acpi_device *device, u8 type, int data);
int acpi_bus_generate_proc_event4(const char *class, const char *bid, u8 type,
--
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