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drivers/ata/libata-zpodd.c
7.11 KB
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#include <linux/libata.h> #include <linux/cdrom.h> |
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#include <linux/pm_runtime.h> |
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#include <linux/module.h> |
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#include <linux/pm_qos.h> |
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#include <scsi/scsi_device.h> |
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#include "libata.h" |
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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"); |
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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; |
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/* The following fields are synchronized by PM core. */ bool from_notify; /* resumed as a result of * acpi wake notification */ |
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bool zp_ready; /* ZP ready state */ unsigned long last_ready; /* last ZP ready timestamp */ bool zp_sampled; /* ZP ready state sampled */ |
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bool powered_off; /* ODD is powered off * during suspend */ |
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}; |
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static int eject_tray(struct ata_device *dev) { |
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struct ata_taskfile tf; |
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const char cdb[] = { GPCMD_START_STOP_UNIT, 0, 0, 0, 0x02, /* LoEj */ 0, 0, 0, 0, 0, 0, 0, }; |
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ata_tf_init(dev, &tf); |
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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); } |
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/* 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); |
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struct ata_taskfile tf; |
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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, }; |
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ata_tf_init(dev, &tf); |
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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; } |
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/* 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; |
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zpodd->zp_ready = false; |
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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; } |
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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. |
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* * Also, media poll needs to be silenced, so that it doesn't bring the ODD * back to full power state every few seconds. |
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*/ void zpodd_enable_run_wake(struct ata_device *dev) { struct zpodd *zpodd = dev->zpodd; |
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sdev_disable_disk_events(dev->sdev); |
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zpodd->powered_off = true; |
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device_set_run_wake(&dev->tdev, true); acpi_pm_device_run_wake(&dev->tdev, true); |
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} /* 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) { |
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acpi_pm_device_run_wake(&dev->tdev, false); device_set_run_wake(&dev->tdev, false); |
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} } /* * 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; |
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sdev_enable_disk_events(dev->sdev); |
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} |
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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; |
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if (event == ACPI_NOTIFY_DEVICE_WAKE && pm_runtime_suspended(dev)) { |
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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) { |
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acpi_handle handle = ata_dev_acpi_handle(dev); |
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acpi_remove_notify_handler(handle, ACPI_SYSTEM_NOTIFY, zpodd_wake_dev); } |
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void zpodd_init(struct ata_device *dev) { |
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struct acpi_device *adev = ACPI_COMPANION(&dev->tdev); |
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enum odd_mech_type mech_type; struct zpodd *zpodd; |
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if (dev->zpodd || !adev || !acpi_device_can_poweroff(adev)) |
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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; |
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ata_acpi_add_pm_notifier(dev); |
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zpodd->dev = dev; dev->zpodd = zpodd; |
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dev_pm_qos_expose_flags(&dev->tdev, 0); |
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} void zpodd_exit(struct ata_device *dev) { |
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ata_acpi_remove_pm_notifier(dev); |
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kfree(dev->zpodd); dev->zpodd = NULL; } |