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Subject[patch 35/38] pm: monwriter power management callbacks.
From: Gerald Schaefer <gerald.schaefer@de.ibm.com>

Signed-off-by: Gerald Schaefer <gerald.schaefer@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
---
drivers/s390/char/monwriter.c | 98 +++++++++++++++++++++++++++++++++++++++---
1 file changed, 92 insertions(+), 6 deletions(-)
Index: linux-2.6/drivers/s390/char/monwriter.c
===================================================================
--- linux-2.6.orig/drivers/s390/char/monwriter.c
+++ linux-2.6/drivers/s390/char/monwriter.c
@@ -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 *i
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 *
kfree(entry->data);
kfree(entry);
}
+ list_del(&monpriv->priv_list);
kfree(monpriv);
return 0;
}
@@ -281,20 +285,102 @@ static struct miscdevice mon_dev = {
};

/*
+ * 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);
--
blue skies,
Martin.

"Reality continues to ruin my life." - Calvin.



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