#include <acpi/acpi_bus.h>
#include <linux/pci-acpi.h>
+#include "pci.h"
static u32 ctrlset_buf[3] = {0, 0, 0};
static u32 global_ctrlsets = 0;
}
EXPORT_SYMBOL(pci_osc_control_set);
+/*
+ * _SxD returns the D-state with the highest power
+ * (lowest D-state number) supported in the S-state "x".
+ *
+ * If the devices does not have a _PRW
+ * (Power Resources for Wake) supporting system wakeup from "x"
+ * then the OS is free to choose a lower power (higher number
+ * D-state) than the return value from _SxD.
+ *
+ * But if _PRW is enabled at S-state "x", the OS
+ * must not choose a power lower than _SxD --
+ * unless the device has an _SxW method specifying
+ * the lowest power (highest D-state number) the device
+ * may enter while still able to wake the system.
+ *
+ * ie. depending on global OS policy:
+ *
+ * if (_PRW at S-state x)
+ * choose from highest power _SxD to lowest power _SxW
+ * else // no _PRW at S-state x
+ * choose highest power _SxD or any lower power
+ *
+ * currently we simply return _SxD, if present.
+ */
+
+static int acpi_pci_choose_state(struct pci_dev *pdev, pm_message_t state)
+{
+ /* TBD */
+
+ return -ENODEV;
+}
+
+static int acpi_pci_set_power_state(struct pci_dev *dev, pci_power_t state)
+{
+ acpi_handle handle = DEVICE_ACPI_HANDLE(&dev->dev);
+ static int state_conv[] = {
+ [0] = 0,
+ [1] = 1,
+ [2] = 2,
+ [3] = 3,
+ [4] = 3
+ };
+ int acpi_state = state_conv[(int __force) state];
+
+ if (!handle)
+ return -ENODEV;
+ return acpi_bus_set_power(handle, acpi_state);
+}
+
+
/* ACPI bus type */
static int pci_acpi_find_device(struct device *dev, acpi_handle *handle)
{
ret = register_acpi_bus_type(&pci_acpi_bus);
if (ret)
return 0;
+ platform_pci_choose_state = acpi_pci_choose_state;
+ platform_pci_set_power_state = acpi_pci_set_power_state;
return 0;
}
arch_initcall(pci_acpi_init);