linux-kernel - [PATCH] Driver core: add suspend() and resume() to struct device

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Message-Id: <200704030108.40947.dtor@insightbb.com>
Date:	Tue, 3 Apr 2007 01:08:40 -0400
From:	Dmitry Torokhov <dtor@...ightbb.com>
To:	Greg KH <gregkh@...e.de>
Cc:	Kay Sievers <kay.sievers@...y.org>, linux-kernel@...r.kernel.org
Subject: [PATCH] Driver core: add suspend() and resume() to struct device_type

Hi Greg,

Here is another patch extending struct device_type. I need it to
implement generic suspend/resume routines for input devices.
As you may remember input core devices and interface devices are
mixed in the same class and because suspend/resume only applies
to core devices so I can't define these methods on class level. 

-- 
Dmitry

Driver core: add suspend() and resume() to struct device_type

In cases when there are devices of different types in the same class
we can't use class's implementation of suspend and resume methods and
we need to add them to struct device_type instead.

Also fix error handling in resume code (we should not try to call
class's resume method iof bus's resume method for the device failed.

Signed-off-by: Dmitry Torokhov <dtor@...l.ru>
---

 drivers/base/power/resume.c  |   13 ++++++++++++-
 drivers/base/power/suspend.c |   12 ++++++++++++
 include/linux/device.h       |    2 ++
 3 files changed, 26 insertions(+), 1 deletion(-)

Index: work/drivers/base/power/resume.c
===================================================================
--- work.orig/drivers/base/power/resume.c
+++ work/drivers/base/power/resume.c
@@ -26,7 +26,9 @@ int resume_device(struct device * dev)
 
 	TRACE_DEVICE(dev);
 	TRACE_RESUME(0);
+
 	down(&dev->sem);
+
 	if (dev->power.pm_parent
 			&& dev->power.pm_parent->power.power_state.event) {
 		dev_err(dev, "PM: resume from %d, parent %s still %d\n",
@@ -34,15 +36,24 @@ int resume_device(struct device * dev)
 			dev->power.pm_parent->bus_id,
 			dev->power.pm_parent->power.power_state.event);
 	}
+
 	if (dev->bus && dev->bus->resume) {
 		dev_dbg(dev,"resuming\n");
 		error = dev->bus->resume(dev);
 	}
-	if (dev->class && dev->class->resume) {
+
+	if (!error && dev->type && dev->type->resume) {
+		dev_dbg(dev,"resuming\n");
+		error = dev->type->resume(dev);
+	}
+
+	if (!error && dev->class && dev->class->resume) {
 		dev_dbg(dev,"class resume\n");
 		error = dev->class->resume(dev);
 	}
+
 	up(&dev->sem);
+
 	TRACE_RESUME(error);
 	return error;
 }
Index: work/drivers/base/power/suspend.c
===================================================================
--- work.orig/drivers/base/power/suspend.c
+++ work/drivers/base/power/suspend.c
@@ -78,6 +78,18 @@ int suspend_device(struct device * dev, 
 		suspend_report_result(dev->class->suspend, error);
 	}
 
+	if (!error && dev->type && dev->type->suspend && !dev->power.power_state.event) {
+		dev_dbg(dev, "%s%s\n",
+			suspend_verb(state.event),
+			((state.event == PM_EVENT_SUSPEND)
+					&& device_may_wakeup(dev))
+				? ", may wakeup"
+				: ""
+			);
+		error = dev->type->suspend(dev, state);
+		suspend_report_result(dev->type->suspend, error);
+	}
+
 	if (!error && dev->bus && dev->bus->suspend && !dev->power.power_state.event) {
 		dev_dbg(dev, "%s%s\n",
 			suspend_verb(state.event),
Index: work/include/linux/device.h
===================================================================
--- work.orig/include/linux/device.h
+++ work/include/linux/device.h
@@ -332,6 +332,8 @@ struct device_type {
 	int (*uevent)(struct device *dev, char **envp, int num_envp,
 		      char *buffer, int buffer_size);
 	void (*release)(struct device *dev);
+	int (*suspend)(struct device * dev, pm_message_t state);
+	int (*resume)(struct device * dev);
 };
 
 /* interface for exporting device attributes */
-
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