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-spi.c b/drivers/mfd/wm831x-spi.c
index 5ea60cd860fc..8d6a9a969dbc 100644
--- a/drivers/mfd/wm831x-spi.c
+++ b/drivers/mfd/wm831x-spi.c
@@ -68,6 +68,13 @@ static int wm831x_spi_suspend(struct device *dev)
         return wm831x_device_suspend(wm831x);
 }
 
+static void wm831x_spi_shutdown(struct spi_device *spi)
+{
+        struct wm831x *wm831x = dev_get_drvdata(&spi->dev);
+
+        wm831x_device_shutdown(wm831x);
+}
+
 static const struct dev_pm_ops wm831x_spi_pm = {
         .freeze = wm831x_spi_suspend,
         .suspend = wm831x_spi_suspend,
@@ -95,6 +102,7 @@ static struct spi_driver wm831x_spi_driver = {
         .id_table       = wm831x_spi_ids,
         .probe          = wm831x_spi_probe,
         .remove         = __devexit_p(wm831x_spi_remove),
+        .shutdown       = wm831x_spi_shutdown,
 };
 
 static int __init wm831x_spi_init(void)