From 4c98cfef2efa6b6662ac28c4f0069964bbd9fdf9 Mon Sep 17 00:00:00 2001
From: Takashi Iwai <tiwai@suse.de>
Date: Tue, 29 Nov 2005 09:09:32 +0100
Subject: [ALSA] PATCH] Add PM support to PnP drivers

Add suspend/resume callback to pnp_driver and pnp_card_driver.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
---
 drivers/pnp/card.c   | 25 +++++++++++++++++++++++++
 drivers/pnp/driver.c | 20 ++++++++++++++++++++
 include/linux/pnp.h  |  5 +++++
 3 files changed, 50 insertions(+)

diff --git a/drivers/pnp/card.c b/drivers/pnp/card.c
index bd7c966ea2d7..0ecbe4edbec1 100644
--- a/drivers/pnp/card.c
+++ b/drivers/pnp/card.c
@@ -69,6 +69,7 @@ static int card_probe(struct pnp_card * card, struct pnp_card_driver * drv)
 			return 0;
 		clink->card = card;
 		clink->driver = drv;
+		clink->pm_state = PMSG_ON;
 		if (drv->probe) {
 			if (drv->probe(clink, id)>=0)
 				return 1;
@@ -333,6 +334,28 @@ void pnp_release_card_device(struct pnp_dev * dev)
 	up_write(&dev->dev.bus->subsys.rwsem);
 }
 
+/*
+ * suspend/resume callbacks
+ */
+static int card_suspend(struct pnp_dev *dev, pm_message_t state)
+{
+	struct pnp_card_link *link = dev->card_link;
+	if (link->pm_state.event == state.event)
+		return 0;
+	link->pm_state = state;
+	return link->driver->suspend(link, state);
+}
+
+static int card_resume(struct pnp_dev *dev)
+{
+	struct pnp_card_link *link = dev->card_link;
+	if (link->pm_state.event == PM_EVENT_ON)
+		return 0;
+	link->pm_state = PMSG_ON;
+	link->driver->resume(link);
+	return 0;
+}
+
 /**
  * pnp_register_card_driver - registers a PnP card driver with the PnP Layer
  * @drv: pointer to the driver to register
@@ -348,6 +371,8 @@ int pnp_register_card_driver(struct pnp_card_driver * drv)
 	drv->link.flags = drv->flags;
 	drv->link.probe = NULL;
 	drv->link.remove = &card_remove_first;
+	drv->link.suspend = drv->suspend ? card_suspend : NULL;
+	drv->link.resume = drv->resume ? card_resume : NULL;
 
 	spin_lock(&pnp_lock);
 	list_add_tail(&drv->global_list, &pnp_card_drivers);
diff --git a/drivers/pnp/driver.c b/drivers/pnp/driver.c
index d3ccce706ab4..ea2cb9a8b21d 100644
--- a/drivers/pnp/driver.c
+++ b/drivers/pnp/driver.c
@@ -146,10 +146,30 @@ static int pnp_bus_match(struct device *dev, struct device_driver *drv)
 	return 1;
 }
 
+static int pnp_bus_suspend(struct device *dev, pm_message_t state)
+{
+	struct pnp_dev * pnp_dev = to_pnp_dev(dev);
+	struct pnp_driver * pnp_drv = pnp_dev->driver;
+
+	if (pnp_drv && pnp_drv->suspend)
+		return pnp_drv->suspend(pnp_dev, state);
+	return 0;
+}
+
+static void pnp_bus_resume(struct device *dev)
+{
+	struct pnp_dev * pnp_dev = to_pnp_dev(dev);
+	struct pnp_driver * pnp_drv = pnp_dev->driver;
+
+	if (pnp_drv && pnp_drv->resume)
+		pnp_drv->resume(pnp_dev);
+}
 
 struct bus_type pnp_bus_type = {
 	.name	= "pnp",
 	.match	= pnp_bus_match,
+	.suspend = pnp_bus_suspend,
+	.resume = pnp_bus_resume,
 };
 
 
diff --git a/include/linux/pnp.h b/include/linux/pnp.h
index 584d57cb393a..472319fcf631 100644
--- a/include/linux/pnp.h
+++ b/include/linux/pnp.h
@@ -162,6 +162,7 @@ struct pnp_card_link {
 	struct pnp_card * card;
 	struct pnp_card_driver * driver;
 	void * driver_data;
+	pm_message_t pm_state;
 };
 
 static inline void *pnp_get_card_drvdata (struct pnp_card_link *pcard)
@@ -294,6 +295,8 @@ struct pnp_driver {
 	unsigned int flags;
 	int  (*probe)  (struct pnp_dev *dev, const struct pnp_device_id *dev_id);
 	void (*remove) (struct pnp_dev *dev);
+	int  (*suspend) (struct pnp_dev *dev, pm_message_t state);
+	int  (*resume) (struct pnp_dev *dev);
 	struct device_driver driver;
 };
 
@@ -306,6 +309,8 @@ struct pnp_card_driver {
 	unsigned int flags;
 	int  (*probe)  (struct pnp_card_link *card, const struct pnp_card_device_id *card_id);
 	void (*remove) (struct pnp_card_link *card);
+	int  (*suspend) (struct pnp_card_link *card, pm_message_t state);
+	int  (*resume) (struct pnp_card_link *card);
 	struct pnp_driver link;
 };
 
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