mfd: Support software initiated shutdown of WM831x PMICs

In systems where there is no hardware signal from the processor to the
PMIC to initiate the final power off sequence we must initiate the
shutdown with a register write to the PMIC. Support such systems in the
driver. Since this may prevent a full shutdown of the system platform
data is used to enable the feature.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

1 files changed, 8 insertions, 0 deletions

diff --git a/drivers/mfd/wm831x-i2c.c b/drivers/mfd/wm831x-i2c.c
index 3ec6085d5fc0..ac8da1d439da 100644
--- a/drivers/mfd/wm831x-i2c.c
+++ b/drivers/mfd/wm831x-i2c.c
@@ -65,6 +65,13 @@ static int wm831x_i2c_suspend(struct device *dev)
         return wm831x_device_suspend(wm831x);
 }
 
+static void wm831x_i2c_shutdown(struct i2c_client *i2c)
+{
+        struct wm831x *wm831x = i2c_get_clientdata(i2c);
+
+        wm831x_device_shutdown(wm831x);
+}
+
 static const struct i2c_device_id wm831x_i2c_id[] = {
         { "wm8310", WM8310 },
         { "wm8311", WM8311 },
@@ -89,6 +96,7 @@ static struct i2c_driver wm831x_i2c_driver = {
         },
         .probe = wm831x_i2c_probe,
         .remove = wm831x_i2c_remove,
+        .shutdown = wm831x_i2c_shutdown,
         .id_table = wm831x_i2c_id,
 };