#include <linux/libata.h>
#include <linux/cdrom.h>
#include <linux/pm_runtime.h>
#include <linux/module.h>
#include <linux/pm_qos.h>
#include <scsi/scsi_device.h>
#include "libata.h"
static int zpodd_poweroff_delay = 30; /* 30 seconds for power off delay */
module_param(zpodd_poweroff_delay, int, 0644);
MODULE_PARM_DESC(zpodd_poweroff_delay, "Poweroff delay for ZPODD in seconds");
enum odd_mech_type {
ODD_MECH_TYPE_SLOT,
ODD_MECH_TYPE_DRAWER,
ODD_MECH_TYPE_UNSUPPORTED,
};
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 */
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,
};
ata_tf_init(dev, &tf);
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)
{
char buf[16];
unsigned int ret;
struct rm_feature_desc *desc = (void *)(buf + 8);
struct ata_taskfile tf;
char cdb[] = { GPCMD_GET_CONFIGURATION,
2, /* only 1 feature descriptor requested */
0, 3, /* 3, removable medium feature */
0, 0, 0,/* reserved */
0, sizeof(buf),
0, 0, 0,
};
ata_tf_init(dev, &tf);
tf.flags = ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
tf.command = ATA_CMD_PACKET;
tf.protocol = ATAPI_PROT_PIO;
tf.lbam = sizeof(buf);
ret = ata_exec_internal(dev, &tf, cdb, DMA_FROM_DEVICE,
buf, sizeof(buf), 0);
if (ret)
return ODD_MECH_TYPE_UNSUPPORTED;
if (be16_to_cpu(desc->feature_code) != 3)
return ODD_MECH_TYPE_UNSUPPORTED;
if (desc->mech_type == 0 && desc->load == 0 && desc->eject == 1)
return ODD_MECH_TYPE_SLOT;
else if (desc->mech_type == 1 && desc->load == 0 && desc->eject == 1)
return ODD_MECH_TYPE_DRAWER;
else
return ODD_MECH_TYPE_UNSUPPORTED;
}
/* Test if ODD is zero power ready by sense code */
static bool zpready(struct ata_device *dev)
{
u8 sense_key, *sense_buf;
unsigned int ret, asc, ascq, add_len;
struct zpodd *zpodd = dev->zpodd;
ret = atapi_eh_tur(dev, &sense_key);
if (!ret || sense_key != NOT_READY)
return false;
sense_buf = dev->link->ap->sector_buf;
ret = atapi_eh_request_sense(dev, sense_buf, sense_key);
if (ret)
return false;
/* sense valid */
if ((sense_buf[0] & 0x7f) != 0x70)
return false;
add_len = sense_buf[7];
/* has asc and ascq */
if (add_len < 6)
return false;
asc = sense_buf[12];
ascq = sense_buf[13];
if (zpodd->mech_type == ODD_MECH_TYPE_SLOT)
/* no media inside */
return asc == 0x3a;
else
/* no media inside and door closed */
return asc == 0x3a && ascq == 0x01;
}
/*
* Update the zpodd->zp_ready field. This field will only be set
* if the ODD has stayed in ZP ready state for zpodd_poweroff_delay
* time, and will be used to decide if power off is allowed. If it
* is set, it will be cleared during resume from powered off state.
*/
void zpodd_on_suspend(struct ata_device *dev)
{
struct zpodd *zpodd = dev->zpodd;
unsigned long expires;
if (!zpready(dev)) {
zpodd->zp_sampled = false;
zpodd->zp_ready = false;
return;
}
if (!zpodd->zp_sampled) {
zpodd->zp_sampled = true;
zpodd->last_ready = jiffies;
return;
}
expires = zpodd->last_ready +
msecs_to_jiffies(zpodd_poweroff_delay * 1000);
if (time_before(jiffies, expires))
return;
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.
*
* Also, media poll needs to be silenced, so that it doesn't bring the ODD
* back to full power state every few seconds.
*/
void zpodd_enable_run_wake(struct ata_device *dev)
{
struct zpodd *zpodd = dev->zpodd;
sdev_disable_disk_events(dev->sdev);
zpodd->powered_off = true;
device_set_run_wake(&dev->tdev, true);
acpi_pm_device_run_wake(&dev->tdev, 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->tdev, false);
device_set_run_wake(&dev->tdev, 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;
sdev_enable_disk_events(dev->sdev);
}
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 && 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 = ata_dev_acpi_handle(dev);
acpi_remove_notify_handler(handle, ACPI_SYSTEM_NOTIFY, zpodd_wake_dev);
}
void zpodd_init(struct ata_device *dev)
{
struct acpi_device *adev = ACPI_COMPANION(&dev->tdev);
enum odd_mech_type mech_type;
struct zpodd *zpodd;
if (dev->zpodd || !adev || !acpi_device_can_poweroff(adev))
return;
mech_type = zpodd_get_mech_type(dev);
if (mech_type == ODD_MECH_TYPE_UNSUPPORTED)
return;
zpodd = kzalloc(sizeof(struct zpodd), GFP_KERNEL);
if (!zpodd)
return;
zpodd->mech_type = mech_type;
ata_acpi_add_pm_notifier(dev);
zpodd->dev = dev;
dev->zpodd = zpodd;
dev_pm_qos_expose_flags(&dev->tdev, 0);
}
void zpodd_exit(struct ata_device *dev)
{
ata_acpi_remove_pm_notifier(dev);
kfree(dev->zpodd);
dev->zpodd = NULL;
}
