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ACPI: acpi_pci_set_power_state() cleanups

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Minor cleanups to acpi_pci_set_power_state():  use the ACPI and PCI
state symbols to make clear that a mapping is being done between PCI
and ACPI states, instead of using magic numbers.  For paranoia's sake,
report any errors.  Save five bytes (x86_64) too.

Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Len Brown <len.brown@intel.com>
This commit is contained in:
David Brownell 2008-02-22 21:41:51 -08:00 committed by Len Brown
parent 39273b58a4
commit 583c377f1d
1 changed files with 16 additions and 8 deletions
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24
drivers/pci/pci-acpi.c
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@ -272,21 +272,29 @@ static int acpi_pci_set_power_state(struct pci_dev *dev, pci_power_t state)
{
acpi_handle handle = DEVICE_ACPI_HANDLE(&dev->dev);
acpi_handle tmp;
static int state_conv[] = {
[0] = 0,
[1] = 1,
[2] = 2,
[3] = 3,
[4] = 3
static const u8 state_conv[] = {
[PCI_D0] = ACPI_STATE_D0,
[PCI_D1] = ACPI_STATE_D1,
[PCI_D2] = ACPI_STATE_D2,
[PCI_D3hot] = ACPI_STATE_D3,
[PCI_D3cold] = ACPI_STATE_D3
};
int acpi_state = state_conv[(int __force) state];
if (!handle)
return -ENODEV;
/* If the ACPI device has _EJ0, ignore the device */
if (ACPI_SUCCESS(acpi_get_handle(handle, "_EJ0", &tmp)))
return 0;
return acpi_bus_set_power(handle, acpi_state);
switch (state) {
case PCI_D0:
case PCI_D1:
case PCI_D2:
case PCI_D3hot:
case PCI_D3cold:
return acpi_bus_set_power(handle, state_conv[state]);
}
return -EINVAL;
}