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[S390] pm: monwriter power management callbacks.
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Signed-off-by: Gerald Schaefer <[email protected]>
Signed-off-by: Martin Schwidefsky <[email protected]>
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gerald-schaefer authored and Martin Schwidefsky committed Jun 16, 2009
1 parent 0399790 commit fb78140
Showing 1 changed file with 92 additions and 6 deletions.
98 changes: 92 additions & 6 deletions drivers/s390/char/monwriter.c
Original file line number Diff line number Diff line change
@@ -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 <[email protected]>
*/
@@ -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);

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