diff options
Diffstat (limited to 'drivers/ata/libata-zpodd.c')
| -rw-r--r-- | drivers/ata/libata-zpodd.c | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/drivers/ata/libata-zpodd.c b/drivers/ata/libata-zpodd.c index 27eed2f09a8a..9a0d90d09d81 100644 --- a/drivers/ata/libata-zpodd.c +++ b/drivers/ata/libata-zpodd.c @@ -1,5 +1,7 @@ #include <linux/libata.h> #include <linux/cdrom.h> +#include <linux/pm_runtime.h> +#include <scsi/scsi_device.h> #include "libata.h" @@ -12,6 +14,10 @@ enum odd_mech_type { struct zpodd { enum odd_mech_type mech_type; /* init during probe, RO afterwards */ struct ata_device *dev; + + /* The following fields are synchronized by PM core. */ + bool from_notify; /* resumed as a result of + * acpi wake notification */ }; /* Per the spec, only slot type and drawer type ODD can be supported */ @@ -68,6 +74,32 @@ static bool odd_can_poweroff(struct ata_device *ata_dev) return acpi_device_can_poweroff(acpi_dev); } +static void zpodd_wake_dev(acpi_handle handle, u32 event, void *context) +{ + struct ata_device *ata_dev = context; + struct zpodd *zpodd = ata_dev->zpodd; + struct device *dev = &ata_dev->sdev->sdev_gendev; + + if (event == ACPI_NOTIFY_DEVICE_WAKE && ata_dev && + pm_runtime_suspended(dev)) { + zpodd->from_notify = true; + pm_runtime_resume(dev); + } +} + +static void ata_acpi_add_pm_notifier(struct ata_device *dev) +{ + acpi_handle handle = ata_dev_acpi_handle(dev); + acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY, + zpodd_wake_dev, dev); +} + +static void ata_acpi_remove_pm_notifier(struct ata_device *dev) +{ + acpi_handle handle = DEVICE_ACPI_HANDLE(&dev->sdev->sdev_gendev); + acpi_remove_notify_handler(handle, ACPI_SYSTEM_NOTIFY, zpodd_wake_dev); +} + void zpodd_init(struct ata_device *dev) { enum odd_mech_type mech_type; @@ -89,12 +121,14 @@ void zpodd_init(struct ata_device *dev) zpodd->mech_type = mech_type; + ata_acpi_add_pm_notifier(dev); zpodd->dev = dev; dev->zpodd = zpodd; } void zpodd_exit(struct ata_device *dev) { + ata_acpi_remove_pm_notifier(dev); kfree(dev->zpodd); dev->zpodd = NULL; } |