[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>
diff --git a/drivers/pnp/card.c b/drivers/pnp/card.c
index bd7c966..0ecbe4e 100644
--- a/drivers/pnp/card.c
+++ b/drivers/pnp/card.c
@@ -69,6 +69,7 @@
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 @@
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 @@
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);