[PATCH v6 33/48] staging: nvec: Register with kernel power-off handler

[Guenter Roeck]

Register with kernel power-off handler instead of setting pm_power_off
directly. Register with default priority since we don't know any better.

Cc: Julian Andres Klode <jak@xxxxxxxxxxxxx>
Cc: Marc Dietrich <marvin24@xxxxxx>
Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Acked-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Acked-by: Marc Dietrich <marvin24@xxxxxx>
Signed-off-by: Guenter Roeck <linux@xxxxxxxxxxxx>
---
v6:
- This patch: No change.
  Global: Replaced priority defines with enum.
v5:
- Rebase to v3.18-rc3
v4:
- Do not use notifiers but internal functions and data structures to manage
  the list of power-off handlers. Drop unused parameters from callbacks, and
  make the power-off function type void
v3:
- Replace poweroff in all newly introduced variables and in text
  with power_off or power-off as appropriate
- Replace POWEROFF_PRIORITY_xxx with POWER_OFF_PRIORITY_xxx
v2:
- Use define to specify poweroff handler priority
- Use dev_warn instead of dev_err

 drivers/staging/nvec/nvec.c | 21 ++++++++++++---------
 drivers/staging/nvec/nvec.h |  2 ++
 2 files changed, 14 insertions(+), 9 deletions(-)

diff --git a/drivers/staging/nvec/nvec.c b/drivers/staging/nvec/nvec.c
index a93208a..acf2ea6 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 +758,14 @@ static void nvec_disable_i2c_slave(struct nvec_chip *nvec)
 }
 #endif
 
-static void nvec_power_off(void)
+static void nvec_power_off(struct power_off_handler_block *this)
 {
+	struct nvec_chip *nvec = container_of(this, struct nvec_chip,
+					      power_off_hb);
 	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);
 }
 
 /*
@@ -878,8 +879,11 @@ 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->power_off_hb.handler = nvec_power_off;
+	nvec->power_off_hb.priority = POWER_OFF_PRIORITY_DEFAULT;
+	ret = register_power_off_handler(&nvec->power_off_hb);
+	if (ret)
+		dev_warn(nvec->dev, "Failed to register power-off handler\n");
 
 	/* Get Firmware Version */
 	msg = nvec_write_sync(nvec, get_firmware_version, 2);
@@ -914,13 +918,12 @@ static int tegra_nvec_remove(struct platform_device *pdev)
 {
 	struct nvec_chip *nvec = platform_get_drvdata(pdev);
 
+	unregister_power_off_handler(&nvec->power_off_hb);
 	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..d4145da 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 power_off_handler_block power_off_hb;
 };
 
 extern int nvec_write_async(struct nvec_chip *nvec, const unsigned char *data,
-- 
1.9.1

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