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Subject[RFC PATCH 6/6] libata: add ZPODD support
Date
ZPODD(Zero Power Optical Disk Drive) is a new feature in
SATA 3.1 specification. It provides a way to power off unused CDROM.

CDROM is powered off by executing ACPI power resource's _OFF method.

When CDROM is powered off(D3Cold state), inserting disk will trigger a
wakeup event(GPE). GPE AML handler notifies the associated device. Then
CDROM is resumed in the notify handler.

Signed-off-by: Lin Ming <ming.m.lin@intel.com>
---
drivers/ata/libata-acpi.c | 64 +++++++++++++++++++++++++++++++++++++-------
drivers/scsi/sr.c | 39 +++++++++++++++++++++++++++
drivers/scsi/sr.h | 3 ++
3 files changed, 95 insertions(+), 11 deletions(-)
diff --git a/drivers/ata/libata-acpi.c b/drivers/ata/libata-acpi.c
index b03e468..acbb85e 100644
--- a/drivers/ata/libata-acpi.c
+++ b/drivers/ata/libata-acpi.c
@@ -16,6 +16,7 @@
#include <linux/libata.h>
#include <linux/pci.h>
#include <linux/slab.h>
+#include <linux/pm_runtime.h>
#include <scsi/scsi_device.h>
#include "libata.h"

@@ -841,23 +842,45 @@ void ata_acpi_on_resume(struct ata_port *ap)
void ata_acpi_set_state(struct ata_port *ap, pm_message_t state)
{
struct ata_device *dev;
-
- if (!ata_ap_acpi_handle(ap) || (ap->flags & ATA_FLAG_ACPI_SATA))
- return;
+ acpi_handle handle;
+ int acpi_state;

/* channel first and then drives for power on and vica versa
for power off */
- if (state.event == PM_EVENT_ON)
- acpi_bus_set_power(ata_ap_acpi_handle(ap), ACPI_STATE_D0);
+ handle = ata_ap_acpi_handle(ap);
+ if (handle && state.event == PM_EVENT_ON)
+ acpi_bus_set_power(handle, ACPI_STATE_D0);

ata_for_each_dev(dev, &ap->link, ENABLED) {
- if (ata_dev_acpi_handle(dev))
- acpi_bus_set_power(ata_dev_acpi_handle(dev),
- state.event == PM_EVENT_ON ?
- ACPI_STATE_D0 : ACPI_STATE_D3);
+ handle = ata_dev_acpi_handle(dev);
+ if (!handle)
+ continue;
+
+ if (state.event != PM_EVENT_ON) {
+ acpi_state = acpi_pm_device_sleep_state(
+ &dev->sdev->sdev_gendev, NULL);
+ if (acpi_state > 0) {
+ if (acpi_state == ACPI_STATE_D3_COLD &&
+ !pm_runtime_can_power_off(
+ &dev->sdev->sdev_gendev))
+ acpi_state = ACPI_STATE_D3;
+
+ acpi_bus_set_power(handle, acpi_state);
+ }
+ if (ap->tdev.power.request == RPM_REQ_SUSPEND);
+ acpi_pm_device_run_wake(
+ &dev->sdev->sdev_gendev, true);
+ } else {
+ if (ap->tdev.power.request == RPM_REQ_RESUME);
+ acpi_pm_device_run_wake(
+ &dev->sdev->sdev_gendev, false);
+ acpi_bus_set_power(handle, ACPI_STATE_D0);
+ }
}
- if (state.event != PM_EVENT_ON)
- acpi_bus_set_power(ata_ap_acpi_handle(ap), ACPI_STATE_D3);
+
+ handle = ata_ap_acpi_handle(ap);
+ if (handle && state.event != PM_EVENT_ON)
+ acpi_bus_set_power(handle, ACPI_STATE_D3);
}

/**
@@ -1007,6 +1030,14 @@ static int ata_acpi_bind_host(struct device *dev, int host, acpi_handle *handle)
return 0;
}

+static void ata_acpi_wake_dev(acpi_handle handle, u32 event, void *context)
+{
+ struct ata_device *ata_dev = context;
+
+ if (event == ACPI_NOTIFY_DEVICE_WAKE && ata_dev)
+ scsi_autopm_get_device(ata_dev->sdev);
+}
+
static int ata_acpi_bind_device(struct device *dev, int channel, int id,
acpi_handle *handle)
{
@@ -1014,6 +1045,8 @@ static int ata_acpi_bind_device(struct device *dev, int channel, int id,
struct Scsi_Host *shost = dev_to_shost(host);
struct ata_port *ap = ata_shost_to_port(shost);
struct ata_device *ata_dev;
+ struct acpi_device *acpi_dev;
+ acpi_status status;

if (ap->flags & ATA_FLAG_ACPI_SATA)
ata_dev = &ap->link.device[channel];
@@ -1028,6 +1061,15 @@ static int ata_acpi_bind_device(struct device *dev, int channel, int id,
if (!is_registered_hotplug_dock_device(&ata_acpi_dev_dock_ops))
register_hotplug_dock_device(*handle, &ata_acpi_dev_dock_ops, ata_dev);

+ status = acpi_bus_get_device(*handle, &acpi_dev);
+ if (ACPI_SUCCESS(status) && acpi_dev->wakeup.flags.run_wake) {
+ acpi_install_notify_handler(*handle, ACPI_SYSTEM_NOTIFY,
+ ata_acpi_wake_dev, ata_dev);
+ device_set_run_wake(dev, true);
+
+ acpi_power_resource_register_device(dev, *handle);
+ }
+
return 0;
}

diff --git a/drivers/scsi/sr.c b/drivers/scsi/sr.c
index 5fc97d2..bf4eace 100644
--- a/drivers/scsi/sr.c
+++ b/drivers/scsi/sr.c
@@ -45,6 +45,7 @@
#include <linux/blkdev.h>
#include <linux/mutex.h>
#include <linux/slab.h>
+#include <linux/pm_runtime.h>
#include <asm/uaccess.h>

#include <scsi/scsi.h>
@@ -80,12 +81,38 @@ static int sr_probe(struct device *);
static int sr_remove(struct device *);
static int sr_done(struct scsi_cmnd *);

+static int sr_suspend(struct device *dev)
+{
+ struct scsi_cd *cd;
+
+ cd = dev_get_drvdata(dev);
+ if (cd->zpodd)
+ pm_runtime_enable_power_off(dev);
+
+ return 0;
+}
+
+static int sr_resume(struct device *dev)
+{
+ struct scsi_cd *cd;
+
+ cd = dev_get_drvdata(dev);
+ if (cd->zpodd) {
+ pm_runtime_disable_power_off(dev);
+ cd->zpodd_event = 0;
+ }
+
+ return 0;
+}
+
static struct scsi_driver sr_template = {
.owner = THIS_MODULE,
.gendrv = {
.name = "sr",
.probe = sr_probe,
.remove = sr_remove,
+ .suspend = sr_suspend,
+ .resume = sr_resume,
},
.done = sr_done,
};
@@ -216,6 +243,10 @@ static unsigned int sr_check_events(struct cdrom_device_info *cdi,
unsigned int events;
int ret;

+ /* Not necessary to check events if enter ZPODD state */
+ if (cd->zpodd && pm_runtime_suspended(&cd->device->sdev_gendev))
+ return 0;
+
/* no changer support */
if (CDSL_CURRENT != slot)
return 0;
@@ -260,6 +291,11 @@ static unsigned int sr_check_events(struct cdrom_device_info *cdi,
cd->media_present = scsi_status_is_good(ret) ||
(scsi_sense_valid(&sshdr) && sshdr.asc != 0x3a);

+ if (!cd->media_present && cd->zpodd && !cd->zpodd_event) {
+ scsi_autopm_put_device(cd->device);
+ cd->zpodd_event = 1;
+ }
+
if (last_present != cd->media_present)
cd->device->changed = 1;

@@ -716,6 +752,9 @@ static int sr_probe(struct device *dev)
disk->flags |= GENHD_FL_REMOVABLE;
add_disk(disk);

+ if (device_run_wake(dev))
+ cd->zpodd = 1;
+
sdev_printk(KERN_DEBUG, sdev,
"Attached scsi CD-ROM %s\n", cd->cdi.name);
return 0;
diff --git a/drivers/scsi/sr.h b/drivers/scsi/sr.h
index 37c8f6b..39b3d8c 100644
--- a/drivers/scsi/sr.h
+++ b/drivers/scsi/sr.h
@@ -42,6 +42,9 @@ typedef struct scsi_cd {
unsigned readcd_cdda:1; /* reading audio data using READ_CD */
unsigned media_present:1; /* media is present */

+ unsigned zpodd:1; /* is ZPODD supported */
+ unsigned zpodd_event:1;
+
/* GET_EVENT spurious event handling, blk layer guarantees exclusion */
int tur_mismatch; /* nr of get_event TUR mismatches */
bool tur_changed:1; /* changed according to TUR */
--
1.7.2.5


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