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| author | Shaohua Li <shaohua.li@intel.com> | 2007-11-02 09:32:38 +0800 |
|---|---|---|
| committer | Jeff Garzik <jeff@garzik.org> | 2008-01-23 05:24:09 -0500 |
| commit | bd3adca52bc43b72c75db3e4c7809d47923b154c (patch) | |
| tree | ec42456926e50a4b0adf916ac1c5f39f76e057f8 /drivers/ata/libata-acpi.c | |
| parent | ae8d4ee7ff429136c8b482c3b38ed994c021d3fc (diff) | |
| download | lwn-bd3adca52bc43b72c75db3e4c7809d47923b154c.tar.gz lwn-bd3adca52bc43b72c75db3e4c7809d47923b154c.zip | |
libata-acpi: add ACPI _PSx method
ACPI spec (ver 3.0a, p289) requires IDE power on/off executes ACPI _PSx
methods. As recently most PATA drivers use libata, this patch adds _PSx
method support in libata. ACPI spec doesn't mention if SATA requires the
same _PSx method.
Signed-off-by: Shaohua Li <shaohua.li@intel.com>
Acked-by: Len Brown <len.brown@intel.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
Diffstat (limited to 'drivers/ata/libata-acpi.c')
| -rw-r--r-- | drivers/ata/libata-acpi.c | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/drivers/ata/libata-acpi.c b/drivers/ata/libata-acpi.c index 7bf4befd96bc..ebc4dfcf2f19 100644 --- a/drivers/ata/libata-acpi.c +++ b/drivers/ata/libata-acpi.c @@ -776,6 +776,36 @@ void ata_acpi_on_resume(struct ata_port *ap) } /** + * ata_acpi_set_state - set the port power state + * @ap: target ATA port + * @state: state, on/off + * + * This function executes the _PS0/_PS3 ACPI method to set the power state. + * ACPI spec requires _PS0 when IDE power on and _PS3 when power off + */ +void ata_acpi_set_state(struct ata_port *ap, pm_message_t state) +{ + struct ata_device *dev; + + if (!ap->acpi_handle || (ap->flags & ATA_FLAG_ACPI_SATA)) + return; + + /* channel first and then drives for power on and vica versa + for power off */ + if (state.event == PM_EVENT_ON) + acpi_bus_set_power(ap->acpi_handle, ACPI_STATE_D0); + + ata_link_for_each_dev(dev, &ap->link) { + if (dev->acpi_handle && ata_dev_enabled(dev)) + acpi_bus_set_power(dev->acpi_handle, + state.event == PM_EVENT_ON ? + ACPI_STATE_D0 : ACPI_STATE_D3); + } + if (state.event != PM_EVENT_ON) + acpi_bus_set_power(ap->acpi_handle, ACPI_STATE_D3); +} + +/** * ata_acpi_on_devcfg - ATA ACPI hook called on device donfiguration * @dev: target ATA device * |