power: pm2301-charger: use __maybe_unused to hide pm functions

The pm2301 charger driver uses nested #ifdefs to check for both
CONFIG_PM and CONFIG_PM_SLEEP in an attempt to hide its
suspend and runtime-pm operations when they are unused, but
it does not hide the clear_lpn_pin() function in the same
way, so we get a build warning when everything is
disabled:

drivers/power/pm2301_charger.c:123:13: error: 'clear_lpn_pin' defined but not used [-Werror=unused-function]

This removes all the #ifdef and instead uses __maybe_unused
annotations to let the compiler know it can silently drop
the function definition.

For the PM2XXX_PM_OPS, we can use an IS_ENABLED() check
to avoid defining the structure when CONFIG_PM is not set without
the #ifdef.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Sebastian Reichel <sre@kernel.org>

diff --git a/drivers/power/pm2301_charger.c b/drivers/power/pm2301_charger.c
index 8f9bd1d0eeb62ff18c69cda8878a671d6d0ab180..fb62ed3fc38c446041ded70e7da2c014e3f60cae 100644 (file)
--- a/drivers/power/pm2301_charger.c
+++ b/drivers/power/pm2301_charger.c
@@ -911,11 +911,7 @@ static struct pm2xxx_irq pm2xxx_charger_irq[] = {
        {"PM2XXX_IRQ_INT", pm2xxx_irq_int},
 };
 
-#ifdef CONFIG_PM
-
-#ifdef CONFIG_PM_SLEEP
-
-static int pm2xxx_wall_charger_resume(struct device *dev)
+static int __maybe_unused pm2xxx_wall_charger_resume(struct device *dev)
 {
        struct i2c_client *i2c_client = to_i2c_client(dev);
        struct pm2xxx_charger *pm2;
@@ -931,7 +927,7 @@ static int pm2xxx_wall_charger_resume(struct device *dev)
        return 0;
 }
 
-static int pm2xxx_wall_charger_suspend(struct device *dev)
+static int __maybe_unused pm2xxx_wall_charger_suspend(struct device *dev)
 {
        struct i2c_client *i2c_client = to_i2c_client(dev);
        struct pm2xxx_charger *pm2;
@@ -949,9 +945,7 @@ static int pm2xxx_wall_charger_suspend(struct device *dev)
        return 0;
 }
 
-#endif
-
-static int  pm2xxx_runtime_suspend(struct device *dev)
+static int __maybe_unused pm2xxx_runtime_suspend(struct device *dev)
 {
        struct i2c_client *pm2xxx_i2c_client = to_i2c_client(dev);
        struct pm2xxx_charger *pm2;
@@ -962,7 +956,7 @@ static int  pm2xxx_runtime_suspend(struct device *dev)
        return 0;
 }
 
-static int  pm2xxx_runtime_resume(struct device *dev)
+static int __maybe_unused pm2xxx_runtime_resume(struct device *dev)
 {
        struct i2c_client *pm2xxx_i2c_client = to_i2c_client(dev);
        struct pm2xxx_charger *pm2;
@@ -975,15 +969,11 @@ static int  pm2xxx_runtime_resume(struct device *dev)
        return 0;
 }
 
-static const struct dev_pm_ops pm2xxx_pm_ops = {
+static const struct dev_pm_ops pm2xxx_pm_ops __maybe_unused = {
        SET_SYSTEM_SLEEP_PM_OPS(pm2xxx_wall_charger_suspend,
                pm2xxx_wall_charger_resume)
        SET_RUNTIME_PM_OPS(pm2xxx_runtime_suspend, pm2xxx_runtime_resume, NULL)
 };
-#define  PM2XXX_PM_OPS (&pm2xxx_pm_ops)
-#else
-#define  PM2XXX_PM_OPS  NULL
-#endif
 
 static int pm2xxx_wall_charger_probe(struct i2c_client *i2c_client,
                const struct i2c_device_id *id)
@@ -1244,7 +1234,7 @@ static struct i2c_driver pm2xxx_charger_driver = {
        .remove = pm2xxx_wall_charger_remove,
        .driver = {
                .name = "pm2xxx-wall_charger",
-               .pm = PM2XXX_PM_OPS,
+               .pm = IS_ENABLED(CONFIG_PM) ? &pm2xxx_pm_ops : NULL,
        },
        .id_table = pm2xxx_id,
 };