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authorMark Brown <broonie@opensource.wolfsonmicro.com>2011-09-15 18:54:53 +0200
committerMark Brown <broonie@opensource.wolfsonmicro.com>2011-09-20 13:02:09 +0100
commit523d9cfbb2094e095ff08a01c4eac10cc7d287c3 (patch)
treed1cd9bc2434332e2e79170d6c21d443f2ce5c3ff /drivers/mfd/wm831x-core.c
parent92afb286d744511f51a05f8acb6c111d05737617 (diff)
downloadop-kernel-dev-523d9cfbb2094e095ff08a01c4eac10cc7d287c3.zip
op-kernel-dev-523d9cfbb2094e095ff08a01c4eac10cc7d287c3.tar.gz
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>
Diffstat (limited to 'drivers/mfd/wm831x-core.c')
-rw-r--r--drivers/mfd/wm831x-core.c11
1 files changed, 11 insertions, 0 deletions
diff --git a/drivers/mfd/wm831x-core.c b/drivers/mfd/wm831x-core.c
index 9338f8d..e758c89 100644
--- a/drivers/mfd/wm831x-core.c
+++ b/drivers/mfd/wm831x-core.c
@@ -25,6 +25,7 @@
#include <linux/mfd/wm831x/irq.h>
#include <linux/mfd/wm831x/auxadc.h>
#include <linux/mfd/wm831x/otp.h>
+#include <linux/mfd/wm831x/pmu.h>
#include <linux/mfd/wm831x/regulator.h>
/* Current settings - values are 2*2^(reg_val/4) microamps. These are
@@ -1621,6 +1622,7 @@ int wm831x_device_init(struct wm831x *wm831x, unsigned long id, int irq)
mutex_init(&wm831x->io_lock);
mutex_init(&wm831x->key_lock);
dev_set_drvdata(wm831x->dev, wm831x);
+ wm831x->soft_shutdown = pdata->soft_shutdown;
ret = wm831x_reg_read(wm831x, WM831X_PARENT_ID);
if (ret < 0) {
@@ -1922,6 +1924,15 @@ int wm831x_device_suspend(struct wm831x *wm831x)
return 0;
}
+void wm831x_device_shutdown(struct wm831x *wm831x)
+{
+ if (wm831x->soft_shutdown) {
+ dev_info(wm831x->dev, "Initiating shutdown...\n");
+ wm831x_set_bits(wm831x, WM831X_POWER_STATE, WM831X_CHIP_ON, 0);
+ }
+}
+EXPORT_SYMBOL_GPL(wm831x_device_shutdown);
+
MODULE_DESCRIPTION("Core support for the WM831X AudioPlus PMIC");
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Mark Brown");
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