mfd: ab8500-sysctrl: Provide a platform specific pm_power_off() call-back
The kernel allows us to specify a function call-back which will be
invoked when a system power-off request has been received. Here we
provide one which is to be used when shutting down AB8500 based
platforms.
Signed-off-by: Lee Jones <lee.jones@linaro.org>
diff --git a/drivers/mfd/ab8500-sysctrl.c b/drivers/mfd/ab8500-sysctrl.c
index 8a33b2c..888e066 100644
--- a/drivers/mfd/ab8500-sysctrl.c
+++ b/drivers/mfd/ab8500-sysctrl.c
@@ -7,12 +7,29 @@
#include <linux/err.h>
#include <linux/module.h>
#include <linux/platform_device.h>
+#include <linux/pm.h>
+#include <linux/signal.h>
#include <linux/mfd/abx500.h>
#include <linux/mfd/abx500/ab8500.h>
#include <linux/mfd/abx500/ab8500-sysctrl.h>
static struct device *sysctrl_dev;
+void ab8500_power_off(void)
+{
+ sigset_t old;
+ sigset_t all;
+
+ sigfillset(&all);
+
+ if (!sigprocmask(SIG_BLOCK, &all, &old)) {
+ (void)ab8500_sysctrl_set(AB8500_STW4500CTRL1,
+ AB8500_STW4500CTRL1_SWOFF |
+ AB8500_STW4500CTRL1_SWRESET4500N);
+ (void)sigprocmask(SIG_SETMASK, &old, NULL);
+ }
+}
+
static inline bool valid_bank(u8 bank)
{
return ((bank == AB8500_SYS_CTRL1_BLOCK) ||
@@ -51,7 +68,12 @@
static int ab8500_sysctrl_probe(struct platform_device *pdev)
{
+ struct ab8500_platform_data *plat;
+
sysctrl_dev = &pdev->dev;
+ plat = dev_get_platdata(pdev->dev.parent);
+ if (plat->pm_power_off)
+ pm_power_off = ab8500_power_off;
return 0;
}