linux-kernel - [PATCH 18/44] mfd: twl4030-power: Register with kernel poweroff handler

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Date:	Mon,  6 Oct 2014 22:28:20 -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>,
	Samuel Ortiz <sameo@...ux.intel.com>,
	Lee Jones <lee.jones@...aro.org>
Subject: [PATCH 18/44] mfd: twl4030-power: Register with kernel poweroff handler

Register with kernel poweroff handler instead of setting pm_power_off
directly. Register with a low priority value of 64 to reflect that
the original code only sets pm_power_off if it was not already set.

Make twl4030_power_off static as it is only called from the twl4030-power
driver.

Cc: Samuel Ortiz <sameo@...ux.intel.com>
Cc: Lee Jones <lee.jones@...aro.org>
Signed-off-by: Guenter Roeck <linux@...ck-us.net>
---
 drivers/mfd/twl4030-power.c | 25 +++++++++++++++++++++----
 include/linux/i2c/twl.h     |  1 -
 2 files changed, 21 insertions(+), 5 deletions(-)

diff --git a/drivers/mfd/twl4030-power.c b/drivers/mfd/twl4030-power.c
index 4d3ff37..bd6b830 100644
--- a/drivers/mfd/twl4030-power.c
+++ b/drivers/mfd/twl4030-power.c
@@ -25,9 +25,10 @@
  */
 
 #include <linux/module.h>
-#include <linux/pm.h>
+#include <linux/notifier.h>
 #include <linux/i2c/twl.h>
 #include <linux/platform_device.h>
+#include <linux/pm.h>
 #include <linux/of.h>
 #include <linux/of_device.h>
 
@@ -611,7 +612,8 @@ twl4030_power_configure_resources(const struct twl4030_power_data *pdata)
  * After a successful execution, TWL shuts down the power to the SoC
  * and all peripherals connected to it.
  */
-void twl4030_power_off(void)
+static int twl4030_power_off(struct notifier_block *this, unsigned long unused1,
+			     void *unused2)
 {
 	int err;
 
@@ -619,8 +621,15 @@ void twl4030_power_off(void)
 			       TWL4030_PM_MASTER_P1_SW_EVENTS);
 	if (err)
 		pr_err("TWL4030 Unable to power off\n");
+
+	return NOTIFY_DONE;
 }
 
+static struct notifier_block twl4030_poweroff_nb = {
+	.notifier_call = twl4030_power_off,
+	.priority = 64,
+};
+
 static bool twl4030_power_use_poweroff(const struct twl4030_power_data *pdata,
 					struct device_node *node)
 {
@@ -836,7 +845,7 @@ static int twl4030_power_probe(struct platform_device *pdev)
 	}
 
 	/* Board has to be wired properly to use this feature */
-	if (twl4030_power_use_poweroff(pdata, node) && !pm_power_off) {
+	if (twl4030_power_use_poweroff(pdata, node)) {
 		/* Default for SEQ_OFFSYNC is set, lets ensure this */
 		err = twl_i2c_read_u8(TWL_MODULE_PM_MASTER, &val,
 				      TWL4030_PM_MASTER_CFG_P123_TRANSITION);
@@ -853,7 +862,13 @@ static int twl4030_power_probe(struct platform_device *pdev)
 			}
 		}
 
-		pm_power_off = twl4030_power_off;
+		err = register_poweroff_handler(&twl4030_poweroff_nb);
+		if (err) {
+			dev_err(&pdev->dev,
+				"Failed to register poweroff handler\n");
+			/* Not a fatal error */
+			err = 0;
+		}
 	}
 
 relock:
@@ -869,6 +884,8 @@ relock:
 
 static int twl4030_power_remove(struct platform_device *pdev)
 {
+	unregister_poweroff_handler(&twl4030_poweroff_nb);
+
 	return 0;
 }
 
diff --git a/include/linux/i2c/twl.h b/include/linux/i2c/twl.h
index 8cfb50f..f8544f1 100644
--- a/include/linux/i2c/twl.h
+++ b/include/linux/i2c/twl.h
@@ -680,7 +680,6 @@ struct twl4030_power_data {
 };
 
 extern int twl4030_remove_script(u8 flags);
-extern void twl4030_power_off(void);
 
 struct twl4030_codec_data {
 	unsigned int digimic_delay; /* in ms */
-- 
1.9.1

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