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authorAaron Lu <aaron.lu@intel.com>2013-01-15 17:21:01 +0800
committerJeff Garzik <jgarzik@redhat.com>2013-01-21 15:41:56 -0500
commit213342053db58eabdaddff9c036c2b81ca63c443 (patch)
treee6c8b474717496289a5cbc3674e639f4814f784a /drivers/ata/libata-zpodd.c
parent3dc67440d99b2c718ef5f1eb1424a9066ffa3fb9 (diff)
libata: handle power transition of ODD
When ata port is runtime suspended, it will check if the ODD attched to it is a zero power(ZP) capable ODD and if the ZP capable ODD is in zero power ready state. And if this is not the case, the highest acpi state will be limited to ACPI_STATE_D3_HOT to avoid powering off the ODD. And if the ODD can be powered off, runtime wake capability needs to be enabled and powered_off flag will be set to let resume code knows that the ODD was in powered off state. And on resume, before it is powered on, if it was powered off during suspend, runtime wake capability needs to be disabled. After it is recovered, the ODD is considered functional, post power on processing like eject tray if the ODD is drawer type is done, and several ZPODD related fields will also be reset. Signed-off-by: Aaron Lu <aaron.lu@intel.com> Acked-by: Tejun Heo <tj@kernel.org> Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
Diffstat (limited to 'drivers/ata/libata-zpodd.c')
-rw-r--r--drivers/ata/libata-zpodd.c83
1 files changed, 83 insertions, 0 deletions
diff --git a/drivers/ata/libata-zpodd.c b/drivers/ata/libata-zpodd.c
index 71dd48c94f2c..1f5d52ae3974 100644
--- a/drivers/ata/libata-zpodd.c
+++ b/drivers/ata/libata-zpodd.c
@@ -26,8 +26,26 @@ struct zpodd {
bool zp_ready; /* ZP ready state */
unsigned long last_ready; /* last ZP ready timestamp */
bool zp_sampled; /* ZP ready state sampled */
+ bool powered_off; /* ODD is powered off
+ * during suspend */
};
+static int eject_tray(struct ata_device *dev)
+{
+ struct ata_taskfile tf = {};
+ const char cdb[] = { GPCMD_START_STOP_UNIT,
+ 0, 0, 0,
+ 0x02, /* LoEj */
+ 0, 0, 0, 0, 0, 0, 0,
+ };
+
+ tf.flags = ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
+ tf.command = ATA_CMD_PACKET;
+ tf.protocol = ATAPI_PROT_NODATA;
+
+ return ata_exec_internal(dev, &tf, cdb, DMA_NONE, NULL, 0, 0);
+}
+
/* Per the spec, only slot type and drawer type ODD can be supported */
static enum odd_mech_type zpodd_get_mech_type(struct ata_device *dev)
{
@@ -149,6 +167,71 @@ void zpodd_on_suspend(struct ata_device *dev)
zpodd->zp_ready = true;
}
+bool zpodd_zpready(struct ata_device *dev)
+{
+ struct zpodd *zpodd = dev->zpodd;
+ return zpodd->zp_ready;
+}
+
+/*
+ * Enable runtime wake capability through ACPI and set the powered_off flag,
+ * this flag will be used during resume to decide what operations are needed
+ * to take.
+ */
+void zpodd_enable_run_wake(struct ata_device *dev)
+{
+ struct zpodd *zpodd = dev->zpodd;
+
+ zpodd->powered_off = true;
+ device_set_run_wake(&dev->sdev->sdev_gendev, true);
+ acpi_pm_device_run_wake(&dev->sdev->sdev_gendev, true);
+}
+
+/* Disable runtime wake capability if it is enabled */
+void zpodd_disable_run_wake(struct ata_device *dev)
+{
+ struct zpodd *zpodd = dev->zpodd;
+
+ if (zpodd->powered_off) {
+ acpi_pm_device_run_wake(&dev->sdev->sdev_gendev, false);
+ device_set_run_wake(&dev->sdev->sdev_gendev, false);
+ }
+}
+
+/*
+ * Post power on processing after the ODD has been recovered. If the
+ * ODD wasn't powered off during suspend, it doesn't do anything.
+ *
+ * For drawer type ODD, if it is powered on due to user pressed the
+ * eject button, the tray needs to be ejected. This can only be done
+ * after the ODD has been recovered, i.e. link is initialized and
+ * device is able to process NON_DATA PIO command, as eject needs to
+ * send command for the ODD to process.
+ *
+ * The from_notify flag set in wake notification handler function
+ * zpodd_wake_dev represents if power on is due to user's action.
+ *
+ * For both types of ODD, several fields need to be reset.
+ */
+void zpodd_post_poweron(struct ata_device *dev)
+{
+ struct zpodd *zpodd = dev->zpodd;
+
+ if (!zpodd->powered_off)
+ return;
+
+ zpodd->powered_off = false;
+
+ if (zpodd->from_notify) {
+ zpodd->from_notify = false;
+ if (zpodd->mech_type == ODD_MECH_TYPE_DRAWER)
+ eject_tray(dev);
+ }
+
+ zpodd->zp_sampled = false;
+ zpodd->zp_ready = false;
+}
+
static void zpodd_wake_dev(acpi_handle handle, u32 event, void *context)
{
struct ata_device *ata_dev = context;