1 #include <linux/kernel.h>
3 #include <linux/jiffies.h>
4 #include <linux/blkdev.h>
6 DECLARE_WAIT_QUEUE_HEAD(ide_park_wq);
8 static void issue_park_cmd(ide_drive_t *drive, unsigned long timeout)
10 ide_hwgroup_t *hwgroup = drive->hwif->hwgroup;
11 struct request_queue *q = drive->queue;
16 spin_lock_irq(&hwgroup->lock);
17 if (drive->dev_flags & IDE_DFLAG_PARKED) {
18 int reset_timer = time_before(timeout, drive->sleep);
20 drive->sleep = timeout;
21 wake_up_all(&ide_park_wq);
22 if (reset_timer && hwgroup->sleeping &&
23 del_timer(&hwgroup->timer)) {
24 hwgroup->sleeping = 0;
26 blk_start_queueing(q);
28 spin_unlock_irq(&hwgroup->lock);
31 spin_unlock_irq(&hwgroup->lock);
33 rq = blk_get_request(q, READ, __GFP_WAIT);
34 rq->cmd[0] = REQ_PARK_HEADS;
36 rq->cmd_type = REQ_TYPE_SPECIAL;
37 rq->special = &timeout;
38 rc = blk_execute_rq(q, NULL, rq, 1);
44 * Make sure that *some* command is sent to the drive after the
45 * timeout has expired, so power management will be reenabled.
47 rq = blk_get_request(q, READ, GFP_NOWAIT);
51 rq->cmd[0] = REQ_UNPARK_HEADS;
53 rq->cmd_type = REQ_TYPE_SPECIAL;
54 elv_add_request(q, rq, ELEVATOR_INSERT_FRONT, 1);
60 ssize_t ide_park_show(struct device *dev, struct device_attribute *attr,
63 ide_drive_t *drive = to_ide_device(dev);
64 ide_hwgroup_t *hwgroup = drive->hwif->hwgroup;
68 if (drive->dev_flags & IDE_DFLAG_NO_UNLOAD)
71 spin_lock_irq(&hwgroup->lock);
73 if (drive->dev_flags & IDE_DFLAG_PARKED &&
74 time_after(drive->sleep, now))
75 msecs = jiffies_to_msecs(drive->sleep - now);
78 spin_unlock_irq(&hwgroup->lock);
80 return snprintf(buf, 20, "%u\n", msecs);
83 ssize_t ide_park_store(struct device *dev, struct device_attribute *attr,
84 const char *buf, size_t len)
86 #define MAX_PARK_TIMEOUT 30000
87 ide_drive_t *drive = to_ide_device(dev);
91 rc = strict_strtol(buf, 10, &input);
94 if (input > MAX_PARK_TIMEOUT) {
95 input = MAX_PARK_TIMEOUT;
99 mutex_lock(&ide_setting_mtx);
101 if (drive->dev_flags & IDE_DFLAG_NO_UNLOAD)
103 else if (input || drive->dev_flags & IDE_DFLAG_PARKED)
104 issue_park_cmd(drive, msecs_to_jiffies(input));
106 if (drive->media == ide_disk)
109 drive->dev_flags &= ~IDE_DFLAG_NO_UNLOAD;
112 drive->dev_flags |= IDE_DFLAG_NO_UNLOAD;
118 mutex_unlock(&ide_setting_mtx);
120 return rc ? rc : len;