linux-kernel - [PATCH 29/44] staging: nvec: Register with kernel poweroff handler

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Date:	Mon,  6 Oct 2014 22:28:31 -0700
From:	Guenter Roeck <linux@...ck-us.net>
To:	linux-kernel@...r.kernel.org
Cc:	adi-buildroot-devel@...ts.sourceforge.net,
	devel@...verdev.osuosl.org, devicetree@...r.kernel.org,
	lguest@...ts.ozlabs.org, linux-acpi@...r.kernel.org,
	linux-alpha@...r.kernel.org, linux-am33-list@...hat.com,
	linux-cris-kernel@...s.com, linux-efi@...r.kernel.org,
	linux-hexagon@...r.kernel.org, linux-m32r-ja@...linux-m32r.org,
	linuxppc-dev@...ts.ozlabs.org, linux-s390@...r.kernel.org,
	linux-tegra@...r.kernel.org, linux-xtensa@...ux-xtensa.org,
	openipmi-developer@...ts.sourceforge.net,
	user-mode-linux-devel@...ts.sourceforge.net,
	linux-arm-kernel@...ts.infradead.org, linux-c6x-dev@...ux-c6x.org,
	linux-ia64@...r.kernel.org, linux-m68k@...ts.linux-m68k.org,
	linux-metag@...r.kernel.org, linux-mips@...ux-mips.org,
	linux-parisc@...r.kernel.org, linux-pm@...r.kernel.org,
	linux-sh@...r.kernel.org, xen-devel@...ts.xenproject.org,
	Guenter Roeck <linux@...ck-us.net>,
	Julian Andres Klode <jak@...-linux.org>,
	Marc Dietrich <marvin24@....de>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: [PATCH 29/44] staging: nvec: Register with kernel poweroff handler

Register with kernel poweroff handler instead of setting pm_power_off
directly. Register with default priority value of 128 since we don't know
any better.

Cc: Julian Andres Klode <jak@...-linux.org>
Cc: Marc Dietrich <marvin24@....de>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Signed-off-by: Guenter Roeck <linux@...ck-us.net>
---
 drivers/staging/nvec/nvec.c | 24 +++++++++++++++---------
 drivers/staging/nvec/nvec.h |  2 ++
 2 files changed, 17 insertions(+), 9 deletions(-)

diff --git a/drivers/staging/nvec/nvec.c b/drivers/staging/nvec/nvec.c
index a93208a..33d406c 100644
--- a/drivers/staging/nvec/nvec.c
+++ b/drivers/staging/nvec/nvec.c
@@ -33,6 +33,7 @@
 #include <linux/mfd/core.h>
 #include <linux/mutex.h>
 #include <linux/notifier.h>
+#include <linux/pm.h>
 #include <linux/slab.h>
 #include <linux/spinlock.h>
 #include <linux/workqueue.h>
@@ -80,8 +81,6 @@ enum nvec_sleep_subcmds {
 #define LID_SWITCH BIT(1)
 #define PWR_BUTTON BIT(15)
 
-static struct nvec_chip *nvec_power_handle;
-
 static const struct mfd_cell nvec_devices[] = {
 	{
 		.name = "nvec-kbd",
@@ -759,12 +758,17 @@ static void nvec_disable_i2c_slave(struct nvec_chip *nvec)
 }
 #endif
 
-static void nvec_power_off(void)
+static int nvec_power_off(struct notifier_block *this, unsigned long unused1,
+			  void *unused2)
 {
+	struct nvec_chip *nvec = container_of(this, struct nvec_chip,
+					      poweroff_nb);
 	char ap_pwr_down[] = { NVEC_SLEEP, AP_PWR_DOWN };
 
-	nvec_toggle_global_events(nvec_power_handle, false);
-	nvec_write_async(nvec_power_handle, ap_pwr_down, 2);
+	nvec_toggle_global_events(nvec, false);
+	nvec_write_async(nvec, ap_pwr_down, 2);
+
+	return NOTIFY_DONE;
 }
 
 /*
@@ -878,8 +882,11 @@ static int tegra_nvec_probe(struct platform_device *pdev)
 	nvec->nvec_status_notifier.notifier_call = nvec_status_notifier;
 	nvec_register_notifier(nvec, &nvec->nvec_status_notifier, 0);
 
-	nvec_power_handle = nvec;
-	pm_power_off = nvec_power_off;
+	nvec->poweroff_nb.notifier_call = nvec_power_off;
+	nvec->poweroff_nb.priority = 128;
+	ret = register_poweroff_handler(&nvec->poweroff_nb);
+	if (ret)
+		dev_err(nvec->dev, "Failed to register poweroff handler\n");
 
 	/* Get Firmware Version */
 	msg = nvec_write_sync(nvec, get_firmware_version, 2);
@@ -914,13 +921,12 @@ static int tegra_nvec_remove(struct platform_device *pdev)
 {
 	struct nvec_chip *nvec = platform_get_drvdata(pdev);
 
+	unregister_poweroff_handler(&nvec->poweroff_nb);
 	nvec_toggle_global_events(nvec, false);
 	mfd_remove_devices(nvec->dev);
 	nvec_unregister_notifier(nvec, &nvec->nvec_status_notifier);
 	cancel_work_sync(&nvec->rx_work);
 	cancel_work_sync(&nvec->tx_work);
-	/* FIXME: needs check wether nvec is responsible for power off */
-	pm_power_off = NULL;
 
 	return 0;
 }
diff --git a/drivers/staging/nvec/nvec.h b/drivers/staging/nvec/nvec.h
index e271375..e5ee2af 100644
--- a/drivers/staging/nvec/nvec.h
+++ b/drivers/staging/nvec/nvec.h
@@ -163,6 +163,8 @@ struct nvec_chip {
 	struct nvec_msg *last_sync_msg;
 
 	int state;
+
+	struct notifier_block poweroff_nb;
 };
 
 extern int nvec_write_async(struct nvec_chip *nvec, const unsigned char *data,
-- 
1.9.1

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