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 (file)
--- 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 @@ int ab8500_sysctrl_write(u16 reg, u8 mask, u8 value)
 
 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;
 }
 

diff --git a/include/linux/mfd/abx500/ab8500.h b/include/linux/mfd/abx500/ab8500.h
index 1cb5698..6119b2f 100644 (file)
--- a/include/linux/mfd/abx500/ab8500.h
+++ b/include/linux/mfd/abx500/ab8500.h
@@ -274,6 +274,7 @@ struct ab8500_codec_platform_data;
 /**
  * struct ab8500_platform_data - AB8500 platform data
  * @irq_base: start of AB8500 IRQs, AB8500_NR_IRQS will be used
+ * @pm_power_off: Should machine pm power off hook be registered or not
  * @init: board-specific initialization after detection of ab8500
  * @num_regulator_reg_init: number of regulator init registers
  * @regulator_reg_init: regulator init registers
@@ -282,6 +283,7 @@ struct ab8500_codec_platform_data;
  */
 struct ab8500_platform_data {
        int irq_base;
+       bool pm_power_off;
        void (*init) (struct ab8500 *);
        int num_regulator_reg_init;
        struct ab8500_regulator_reg_init *regulator_reg_init;