abituguru: Add suspend/resume support

This patch contains rudimentary suspend / resume support for the uguru,
this protects the uguru and the driver against suspend / resume cycles,
so there is no reason to unload the driver in your suspend / resume
scripts.

Only include suspend / resume functions when CONFIG_PM is set.

Signed-off-by: Hans de Goede <j.w.r.degoede@hhs.nl>
Signed-off-by: Jean Delvare <khali@linux-fr.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/hwmon/abituguru.c b/drivers/hwmon/abituguru.c
index 35ad1b0327268dac11cf8a3f465a884aef0f42a2..e5cb0fdab9b15d8529274531a8879a31dd2cb0a0 100644 (file)
--- a/drivers/hwmon/abituguru.c
+++ b/drivers/hwmon/abituguru.c
@@ -1354,13 +1354,39 @@ LEAVE_UPDATE:
                return NULL;
 }
 
+#ifdef CONFIG_PM
+static int abituguru_suspend(struct platform_device *pdev, pm_message_t state)
+{
+       struct abituguru_data *data = platform_get_drvdata(pdev);
+       /* make sure all communications with the uguru are done and no new
+          ones are started */
+       mutex_lock(&data->update_lock);
+       return 0;
+}
+
+static int abituguru_resume(struct platform_device *pdev)
+{
+       struct abituguru_data *data = platform_get_drvdata(pdev);
+       /* See if the uGuru is still ready */
+       if (inb_p(data->addr + ABIT_UGURU_DATA) != ABIT_UGURU_STATUS_INPUT)
+               data->uguru_ready = 0;
+       mutex_unlock(&data->update_lock);
+       return 0;
+}
+#else
+#define abituguru_suspend      NULL
+#define abituguru_resume       NULL
+#endif /* CONFIG_PM */
+
 static struct platform_driver abituguru_driver = {
        .driver = {
                .owner  = THIS_MODULE,
                .name   = ABIT_UGURU_NAME,
        },
-       .probe  = abituguru_probe,
-       .remove = __devexit_p(abituguru_remove),
+       .probe          = abituguru_probe,
+       .remove         = __devexit_p(abituguru_remove),
+       .suspend        = abituguru_suspend,
+       .resume         = abituguru_resume,
 };
 
 static int __init abituguru_detect(void)