[Xen-devel] [PATCH 09/44] mfd: palmas: Register with kernel poweroff handler

[Guenter Roeck <linux@xxxxxxxxxxxx>]

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.

Cc: Samuel Ortiz <sameo@xxxxxxxxxxxxxxx>
Cc: Lee Jones <lee.jones@xxxxxxxxxx>
Signed-off-by: Guenter Roeck <linux@xxxxxxxxxxxx>
---
 drivers/mfd/palmas.c       | 30 +++++++++++++++++-------------
 include/linux/mfd/palmas.h |  3 +++
 2 files changed, 20 insertions(+), 13 deletions(-)

diff --git a/drivers/mfd/palmas.c b/drivers/mfd/palmas.c
index 28cb048..4d78847 100644
--- a/drivers/mfd/palmas.c
+++ b/drivers/mfd/palmas.c
@@ -19,6 +19,7 @@
 #include <linux/i2c.h>
 #include <linux/interrupt.h>
 #include <linux/irq.h>
+#include <linux/pm.h>
 #include <linux/regmap.h>
 #include <linux/err.h>
 #include <linux/mfd/core.h>
@@ -425,20 +426,18 @@ static void palmas_dt_to_pdata(struct i2c_client *i2c,
                        "ti,system-power-controller");
 }
 
-static struct palmas *palmas_dev;
-static void palmas_power_off(void)
+static int palmas_power_off(struct notifier_block *this, unsigned long unused1,
+                           void *unused2)
 {
+       struct palmas *palmas = container_of(this, struct palmas, poweroff_nb);
        unsigned int addr;
        int ret, slave;
 
-       if (!palmas_dev)
-               return;
-
        slave = PALMAS_BASE_TO_SLAVE(PALMAS_PMU_CONTROL_BASE);
        addr = PALMAS_BASE_TO_REG(PALMAS_PMU_CONTROL_BASE, PALMAS_DEV_CTRL);
 
        ret = regmap_update_bits(
-                       palmas_dev->regmap[slave],
+                       palmas->regmap[slave],
                        addr,
                        PALMAS_DEV_CTRL_DEV_ON,
                        0);
@@ -446,6 +445,8 @@ static void palmas_power_off(void)
        if (ret)
                pr_err("%s: Unable to write to DEV_CTRL_DEV_ON: %d\n",
                                __func__, ret);
+
+       return NOTIFY_DONE;
 }
 
 static unsigned int palmas_features = PALMAS_PMIC_FEATURE_SMPS10_BOOST;
@@ -668,9 +669,15 @@ no_irq:
                ret = of_platform_populate(node, NULL, NULL, &i2c->dev);
                if (ret < 0) {
                        goto err_irq;
-               } else if (pdata->pm_off && !pm_power_off) {
-                       palmas_dev = palmas;
-                       pm_power_off = palmas_power_off;
+               } else if (pdata->pm_off) {
+                       palmas->poweroff_nb.notifier_call = palmas_power_off;
+                       palmas->poweroff_nb.priority = 64;
+                       ret = register_poweroff_handler(&palmas->poweroff_nb);
+                       if (ret) {
+                               dev_err(palmas->dev,
+                                       "Failed to register poweroff handler");
+                               ret = 0;
+                       }
                }
        }
 
@@ -698,10 +705,7 @@ static int palmas_i2c_remove(struct i2c_client *i2c)
                        i2c_unregister_device(palmas->i2c_clients[i]);
        }
 
-       if (palmas == palmas_dev) {
-               pm_power_off = NULL;
-               palmas_dev = NULL;
-       }
+       unregister_poweroff_handler(&palmas->poweroff_nb);
 
        return 0;
 }
diff --git a/include/linux/mfd/palmas.h b/include/linux/mfd/palmas.h
index fb0390a..4715057 100644
--- a/include/linux/mfd/palmas.h
+++ b/include/linux/mfd/palmas.h
@@ -18,6 +18,7 @@
 
 #include <linux/usb/otg.h>
 #include <linux/leds.h>
+#include <linux/notifier.h>
 #include <linux/regmap.h>
 #include <linux/regulator/driver.h>
 #include <linux/extcon.h>
@@ -68,6 +69,8 @@ struct palmas {
        struct i2c_client *i2c_clients[PALMAS_NUM_CLIENTS];
        struct regmap *regmap[PALMAS_NUM_CLIENTS];
 
+       struct notifier_block poweroff_nb;
+
        /* Stored chip id */
        int id;
 
-- 
1.9.1


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