PM: Rework struct platform_suspend_ops

There is no reason why the .prepare() and .finish() methods in 'struct
platform_suspend_ops' should take any arguments, since architectures don't use
these methods' argument in any practically meaningful way (ie.  either the
target system sleep state is conveyed to the platform by .set_target(), or
there is only one suspend state supported and it is indicated to the PM core
by .valid(), or .prepare() and .finish() aren't defined at all).   There also
is no reason why .finish() should return any result.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Acked-by: Pavel Machek <pavel@ucw.cz>
Cc: Len Brown <lenb@kernel.org>
Cc: Greg KH <greg@kroah.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

5 files changed, 35 insertions, 101 deletions

diff --git a/arch/arm/mach-omap1/pm.c b/arch/arm/mach-omap1/pm.c
index 8db38dd247a4..3bf01e28df33 100644
--- a/arch/arm/mach-omap1/pm.c
+++ b/arch/arm/mach-omap1/pm.c
@@ -599,27 +599,15 @@ static void (*saved_idle)(void) = NULL;
 
 /*
  *      omap_pm_prepare - Do preliminary suspend work.
- *      @state:         suspend state we're entering.
  *
  */
-static int omap_pm_prepare(suspend_state_t state)
+static int omap_pm_prepare(void)
 {
-        int error = 0;
-
         /* We cannot sleep in idle until we have resumed */
         saved_idle = pm_idle;
         pm_idle = NULL;
 
-        switch (state)
-        {
-        case PM_SUSPEND_STANDBY:
-        case PM_SUSPEND_MEM:
-                break;
-        default:
-                return -EINVAL;
-        }
-
-        return error;
+        return 0;
 }
 
 
@@ -647,16 +635,14 @@ static int omap_pm_enter(suspend_state_t state)
 
 /**
  *      omap_pm_finish - Finish up suspend sequence.
- *      @state:         State we're coming out of.
  *
  *      This is called after we wake back up (or if entering the sleep state
  *      failed).
  */
 
-static int omap_pm_finish(suspend_state_t state)
+static void omap_pm_finish(void)
 {
         pm_idle = saved_idle;
-        return 0;
 }
 
 
diff --git a/arch/arm/mach-omap2/pm.c b/arch/arm/mach-omap2/pm.c
index 9aaa7a2633e8..baf7d82b458b 100644
--- a/arch/arm/mach-omap2/pm.c
+++ b/arch/arm/mach-omap2/pm.c
@@ -70,25 +70,12 @@ void omap2_pm_idle(void)
         local_irq_enable();
 }
 
-static int omap2_pm_prepare(suspend_state_t state)
+static int omap2_pm_prepare(void)
 {
-        int error = 0;
-
         /* We cannot sleep in idle until we have resumed */
         saved_idle = pm_idle;
         pm_idle = NULL;
-
-        switch (state)
-        {
-        case PM_SUSPEND_STANDBY:
-        case PM_SUSPEND_MEM:
-                break;
-
-        default:
-                return -EINVAL;
-        }
-
-        return error;
+        return 0;
 }
 
 #define INT0_WAKE_MASK  (OMAP_IRQ_BIT(INT_24XX_GPIO_BANK1) |    \
@@ -356,10 +343,9 @@ static int omap2_pm_enter(suspend_state_t state)
         return ret;
 }
 
-static int omap2_pm_finish(suspend_state_t state)
+static void omap2_pm_finish(void)
 {
         pm_idle = saved_idle;
-        return 0;
 }
 
 static struct platform_suspend_ops omap_pm_ops = {
diff --git a/arch/blackfin/mach-common/pm.c b/arch/blackfin/mach-common/pm.c
index 6901891905cc..dac51fb06f22 100644
--- a/arch/blackfin/mach-common/pm.c
+++ b/arch/blackfin/mach-common/pm.c
@@ -89,28 +89,15 @@ void bfin_pm_suspend_standby_enter(void)
 #endif                          /* CONFIG_PM_WAKEUP_GPIO_BY_SIC_IWR */
 }
 
-
 /*
- *      bfin_pm_prepare - Do preliminary suspend work.
- *      @state:         suspend state we're entering.
+ *      bfin_pm_valid - Tell the PM core that we only support the standby sleep
+ *                      state
+ *      @state:         suspend state we're checking.
  *
  */
-static int bfin_pm_prepare(suspend_state_t state)
+static int bfin_pm_valid(suspend_state_t state)
 {
-        int error = 0;
-
-        switch (state) {
-        case PM_SUSPEND_STANDBY:
-                break;
-
-        case PM_SUSPEND_MEM:
-                return -ENOTSUPP;
-
-        default:
-                return -EINVAL;
-        }
-
-        return error;
+        return (state == PM_SUSPEND_STANDBY);
 }
 
 /*
@@ -135,38 +122,8 @@ static int bfin_pm_enter(suspend_state_t state)
         return 0;
 }
 
-/*
- *      bfin_pm_finish - Finish up suspend sequence.
- *      @state:         State we're coming out of.
- *
- *      This is called after we wake back up (or if entering the sleep state
- *      failed).
- */
-static int bfin_pm_finish(suspend_state_t state)
-{
-        switch (state) {
-        case PM_SUSPEND_STANDBY:
-                break;
-
-        case PM_SUSPEND_MEM:
-                return -ENOTSUPP;
-
-        default:
-                return -EINVAL;
-        }
-
-        return 0;
-}
-
-static int bfin_pm_valid(suspend_state_t state)
-{
-        return (state == PM_SUSPEND_STANDBY);
-}
-
 struct platform_suspend_ops bfin_pm_ops = {
-        .prepare = bfin_pm_prepare,
         .enter = bfin_pm_enter,
-        .finish = bfin_pm_finish,
         .valid  = bfin_pm_valid,
 };
 
diff --git a/arch/powerpc/platforms/52xx/lite5200_pm.c b/arch/powerpc/platforms/52xx/lite5200_pm.c
index f26afcd41757..ffa14aff5248 100644
--- a/arch/powerpc/platforms/52xx/lite5200_pm.c
+++ b/arch/powerpc/platforms/52xx/lite5200_pm.c
@@ -1,5 +1,5 @@
 #include <linux/init.h>
-#include <linux/pm.h>
+#include <linux/suspend.h>
 #include <asm/io.h>
 #include <asm/time.h>
 #include <asm/mpc52xx.h>
@@ -18,6 +18,8 @@ static void __iomem *sram;
 static const int sram_size = 0x4000;    /* 16 kBytes */
 static void __iomem *mbar;
 
+static suspend_state_t lite5200_pm_target_state;
+
 static int lite5200_pm_valid(suspend_state_t state)
 {
         switch (state) {
@@ -29,13 +31,22 @@ static int lite5200_pm_valid(suspend_state_t state)
         }
 }
 
-static int lite5200_pm_prepare(suspend_state_t state)
+static int lite5200_pm_set_target(suspend_state_t state)
+{
+        if (lite5200_pm_valid(state)) {
+                lite5200_pm_target_state = state;
+                return 0;
+        }
+        return -EINVAL;
+}
+
+static int lite5200_pm_prepare(void)
 {
         /* deep sleep? let mpc52xx code handle that */
-        if (state == PM_SUSPEND_STANDBY)
-                return mpc52xx_pm_prepare(state);
+        if (lite5200_pm_target_state == PM_SUSPEND_STANDBY)
+                return mpc52xx_pm_prepare();
 
-        if (state != PM_SUSPEND_MEM)
+        if (lite5200_pm_target_state != PM_SUSPEND_MEM)
                 return -EINVAL;
 
         /* map registers */
@@ -190,17 +201,16 @@ static int lite5200_pm_enter(suspend_state_t state)
         return 0;
 }
 
-static int lite5200_pm_finish(suspend_state_t state)
+static void lite5200_pm_finish(void)
 {
         /* deep sleep? let mpc52xx code handle that */
-        if (state == PM_SUSPEND_STANDBY) {
-                return mpc52xx_pm_finish(state);
-        }
-        return 0;
+        if (lite5200_pm_target_state == PM_SUSPEND_STANDBY)
+                mpc52xx_pm_finish();
 }
 
-static struct pm_ops lite5200_pm_ops = {
+static struct platform_suspend_ops lite5200_pm_ops = {
         .valid          = lite5200_pm_valid,
+        .set_target     = lite5200_pm_set_target,
         .prepare        = lite5200_pm_prepare,
         .enter          = lite5200_pm_enter,
         .finish         = lite5200_pm_finish,
@@ -208,6 +218,6 @@ static struct pm_ops lite5200_pm_ops = {
 
 int __init lite5200_pm_init(void)
 {
-        pm_set_ops(&lite5200_pm_ops);
+        suspend_set_ops(&lite5200_pm_ops);
         return 0;
 }
diff --git a/arch/powerpc/platforms/52xx/mpc52xx_pm.c b/arch/powerpc/platforms/52xx/mpc52xx_pm.c
index 44fb064c7a16..7ffa7babf254 100644
--- a/arch/powerpc/platforms/52xx/mpc52xx_pm.c
+++ b/arch/powerpc/platforms/52xx/mpc52xx_pm.c
@@ -57,11 +57,8 @@ int mpc52xx_set_wakeup_gpio(u8 pin, u8 level)
         return 0;
 }
 
-int mpc52xx_pm_prepare(suspend_state_t state)
+int mpc52xx_pm_prepare(void)
 {
-        if (state != PM_SUSPEND_STANDBY)
-                return -EINVAL;
-
         /* map the whole register space */
         mbar = mpc52xx_find_and_map("mpc5200");
         if (!mbar) {
@@ -166,15 +163,13 @@ int mpc52xx_pm_enter(suspend_state_t state)
         return 0;
 }
 
-int mpc52xx_pm_finish(suspend_state_t state)
+void mpc52xx_pm_finish(void)
 {
         /* call board resume code */
         if (mpc52xx_suspend.board_resume_finish)
                 mpc52xx_suspend.board_resume_finish(mbar);
 
         iounmap(mbar);
-
-        return 0;
 }
 
 static struct platform_suspend_ops mpc52xx_pm_ops = {