[PATCH v5 20/48] mfd: rn5t618: Register power-off handler with kernel power-off handler

Guenter Roeck
2014-11-06T16:59:43Z

directly. Register with low priority to reflect that the original code
only sets pm_power_off if it was not already set.

Cc: Beniamino Galvani <b.galvani@gmail.com>
Acked-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
---
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:
- New patch

drivers/mfd/rn5t618.c | 28 ++++++++++++----------------
include/linux/mfd/rn5t618.h | 2 ++
2 files changed, 14 insertions(+), 16 deletions(-)

diff --git a/drivers/mfd/rn5t618.c b/drivers/mfd/rn5t618.c
index 6668571..1492025 100644
--- a/drivers/mfd/rn5t618.c
+++ b/drivers/mfd/rn5t618.c
@@ -15,6 +15,7 @@
#include <linux/mfd/core.h>
#include <linux/mfd/rn5t618.h>
#include <linux/module.h>
+#include <linux/pm.h>
#include <linux/regmap.h>

static const struct mfd_cell rn5t618_cells[] = {
@@ -47,15 +48,16 @@ static const struct regmap_config rn5t618_regmap_config = {
.cache_type = REGCACHE_RBTREE,
};

-static struct rn5t618 *rn5t618_pm_power_off;
-
-static void rn5t618_power_off(void)
+static void rn5t618_power_off(struct power_off_handler_block *this)
{
+ struct rn5t618 *rn5t618 = container_of(this, struct rn5t618,
+ power_off_hb);
+
/* disable automatic repower-on */
- regmap_update_bits(rn5t618_pm_power_off->regmap, RN5T618_REPCNT,
+ regmap_update_bits(rn5t618->regmap, RN5T618_REPCNT,
RN5T618_REPCNT_REPWRON, 0);
/* start power-off sequence */
- regmap_update_bits(rn5t618_pm_power_off->regmap, RN5T618_SLPCNT,
+ regmap_update_bits(rn5t618->regmap, RN5T618_SLPCNT,
RN5T618_SLPCNT_SWPWROFF, RN5T618_SLPCNT_SWPWROFF);
}

@@ -85,23 +87,17 @@ static int rn5t618_i2c_probe(struct i2c_client *i2c,
return ret;
}

- if (!pm_power_off) {
- rn5t618_pm_power_off = priv;
- pm_power_off = rn5t618_power_off;
- }
+ priv->power_off_hb.handler = rn5t618_power_off;
+ priv->power_off_hb.priority = POWER_OFF_PRIORITY_LOW;
+ ret = devm_register_power_off_handler(&i2c->dev, &priv->power_off_hb);
+ if (ret)
+ dev_warn(&i2c->dev, "Failed to register power-off handler\n");

return 0;
}

static int rn5t618_i2c_remove(struct i2c_client *i2c)
{
- struct rn5t618 *priv = i2c_get_clientdata(i2c);
-
- if (priv == rn5t618_pm_power_off) {
- rn5t618_pm_power_off = NULL;
- pm_power_off = NULL;
- }
-
mfd_remove_devices(&i2c->dev);
return 0;
}
diff --git a/include/linux/mfd/rn5t618.h b/include/linux/mfd/rn5t618.h
index c72d534..87e34b3 100644
--- a/include/linux/mfd/rn5t618.h
+++ b/include/linux/mfd/rn5t618.h
@@ -14,6 +14,7 @@
#ifndef __LINUX_MFD_RN5T618_H
#define __LINUX_MFD_RN5T618_H

+#include <linux/pm.h>
#include <linux/regmap.h>

#define RN5T618_LSIVER 0x00
@@ -223,6 +224,7 @@ enum {

struct rn5t618 {
struct regmap *regmap;
+ struct power_off_handler_block power_off_hb;
};

#endif /* __LINUX_MFD_RN5T618_H */
--
1.9.1