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[S390] pm: monwriter power management callbacks.

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Signed-off-by: Gerald Schaefer <gerald.schaefer@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Gerald Schaefer 2009-06-16 10:30:49 +02:00 committed by Martin Schwidefsky
parent 0399790498
commit fb78140ced
1 changed files with 92 additions and 6 deletions
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98
drivers/s390/char/monwriter.c
View file

@ -1,9 +1,7 @@
/*
* drivers/s390/char/monwriter.c
*
* Character device driver for writing z/VM *MONITOR service records.
*
* Copyright (C) IBM Corp. 2006
* Copyright IBM Corp. 2006, 2009
*
* Author(s): Melissa Howland <Melissa.Howland@us.ibm.com>
*/
@ -22,6 +20,7 @@
#include <linux/ctype.h>
#include <linux/poll.h>
#include <linux/mutex.h>
#include <linux/platform_device.h>
#include <asm/uaccess.h>
#include <asm/ebcdic.h>
#include <asm/io.h>
@ -40,7 +39,10 @@ struct mon_buf {
char *data;
};
static LIST_HEAD(mon_priv_list);
struct mon_private {
struct list_head priv_list;
struct list_head list;
struct monwrite_hdr hdr;
size_t hdr_to_read;
@ -188,6 +190,7 @@ static int monwrite_open(struct inode *inode, struct file *filp)
monpriv->hdr_to_read = sizeof(monpriv->hdr);
mutex_init(&monpriv->thread_mutex);
filp->private_data = monpriv;
list_add_tail(&monpriv->priv_list, &mon_priv_list);
unlock_kernel();
return nonseekable_open(inode, filp);
}
@ -206,6 +209,7 @@ static int monwrite_close(struct inode *inode, struct file *filp)
kfree(entry->data);
kfree(entry);
}
list_del(&monpriv->priv_list);
kfree(monpriv);
return 0;
}
@ -280,21 +284,103 @@ static struct miscdevice mon_dev = {
.minor = MISC_DYNAMIC_MINOR,
};
/*
* suspend/resume
*/
static int monwriter_freeze(struct device *dev)
{
struct mon_private *monpriv;
struct mon_buf *monbuf;
list_for_each_entry(monpriv, &mon_priv_list, priv_list) {
list_for_each_entry(monbuf, &monpriv->list, list) {
if (monbuf->hdr.mon_function != MONWRITE_GEN_EVENT)
monwrite_diag(&monbuf->hdr, monbuf->data,
APPLDATA_STOP_REC);
}
}
return 0;
}
static int monwriter_restore(struct device *dev)
{
struct mon_private *monpriv;
struct mon_buf *monbuf;
list_for_each_entry(monpriv, &mon_priv_list, priv_list) {
list_for_each_entry(monbuf, &monpriv->list, list) {
if (monbuf->hdr.mon_function == MONWRITE_START_INTERVAL)
monwrite_diag(&monbuf->hdr, monbuf->data,
APPLDATA_START_INTERVAL_REC);
if (monbuf->hdr.mon_function == MONWRITE_START_CONFIG)
monwrite_diag(&monbuf->hdr, monbuf->data,
APPLDATA_START_CONFIG_REC);
}
}
return 0;
}
static int monwriter_thaw(struct device *dev)
{
return monwriter_restore(dev);
}
static struct dev_pm_ops monwriter_pm_ops = {
.freeze = monwriter_freeze,
.thaw = monwriter_thaw,
.restore = monwriter_restore,
};
static struct platform_driver monwriter_pdrv = {
.driver = {
.name = "monwriter",
.owner = THIS_MODULE,
.pm = &monwriter_pm_ops,
},
};
static struct platform_device *monwriter_pdev;
/*
* module init/exit
*/
static int __init mon_init(void)
{
if (MACHINE_IS_VM)
return misc_register(&mon_dev);
else
int rc;
if (!MACHINE_IS_VM)
return -ENODEV;
rc = platform_driver_register(&monwriter_pdrv);
if (rc)
return rc;
monwriter_pdev = platform_device_register_simple("monwriter", -1, NULL,
0);
if (IS_ERR(monwriter_pdev)) {
rc = PTR_ERR(monwriter_pdev);
goto out_driver;
}
rc = misc_register(&mon_dev);
if (rc)
goto out_device;
return 0;
out_device:
platform_device_unregister(monwriter_pdev);
out_driver:
platform_driver_unregister(&monwriter_pdrv);
return rc;
}
static void __exit mon_exit(void)
{
WARN_ON(misc_deregister(&mon_dev) != 0);
platform_device_unregister(monwriter_pdev);
platform_driver_unregister(&monwriter_pdrv);
}
module_init(mon_init);