Introduce CONFIG_SUSPEND for suspend-to-Ram and standby

Introduce CONFIG_SUSPEND representing the ability to enter system sleep
states, such as the ACPI S3 state, and allow the user to choose SUSPEND
and HIBERNATION independently of each other.

Make HOTPLUG_CPU be selected automatically if SUSPEND or HIBERNATION has
been chosen and the kernel is intended for SMP systems.

Also, introduce CONFIG_PM_SLEEP which is automatically selected if
CONFIG_SUSPEND or CONFIG_HIBERNATION is set and use it to select the
code needed for both suspend and hibernation.

The top-level power management headers and the ACPI code related to
suspend and hibernation are modified to use the new definitions (the
changes in drivers/acpi/sleep/main.c are, mostly, moving code to reduce
the number of ifdefs).

There are many other files in which CONFIG_PM can be replaced with
CONFIG_PM_SLEEP or even with CONFIG_SUSPEND, but they can be updated in
the future.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

4 files changed, 58 insertions, 50 deletions

diff --git a/drivers/acpi/sleep/Makefile b/drivers/acpi/sleep/Makefile
index 01a993a1d086..2bec897ab1eb 100644
--- a/drivers/acpi/sleep/Makefile
+++ b/drivers/acpi/sleep/Makefile
@@ -1,5 +1,5 @@
 obj-y                                   := poweroff.o wakeup.o
-obj-y                                   += main.o
+obj-$(CONFIG_PM_SLEEP)                  += main.o
 obj-$(CONFIG_X86)                       += proc.o
 
 EXTRA_CFLAGS += $(ACPI_CFLAGS)
diff --git a/drivers/acpi/sleep/main.c b/drivers/acpi/sleep/main.c
index b4e94c893c81..e8cff5dd4cbc 100644
--- a/drivers/acpi/sleep/main.c
+++ b/drivers/acpi/sleep/main.c
@@ -21,6 +21,9 @@
 
 u8 sleep_states[ACPI_S_STATE_COUNT];
 
+static u32 acpi_target_sleep_state = ACPI_STATE_S0;
+
+#ifdef CONFIG_SUSPEND
 static struct pm_ops acpi_pm_ops;
 
 extern void do_suspend_lowlevel(void);
@@ -34,11 +37,6 @@ static u32 acpi_suspend_states[] = {
 
 static int init_8259A_after_S1;
 
-extern int acpi_sleep_prepare(u32 acpi_state);
-extern void acpi_power_off(void);
-
-static u32 acpi_target_sleep_state = ACPI_STATE_S0;
-
 /**
  *      acpi_pm_set_target - Set the target system sleep state to the state
  *              associated with given @pm_state, if supported.
@@ -163,21 +161,6 @@ static int acpi_pm_finish(suspend_state_t pm_state)
         return 0;
 }
 
-int acpi_suspend(u32 acpi_state)
-{
-        suspend_state_t states[] = {
-                [1] = PM_SUSPEND_STANDBY,
-                [3] = PM_SUSPEND_MEM,
-                [5] = PM_SUSPEND_MAX
-        };
-
-        if (acpi_state < 6 && states[acpi_state])
-                return pm_suspend(states[acpi_state]);
-        if (acpi_state == 4)
-                return hibernate();
-        return -EINVAL;
-}
-
 static int acpi_pm_state_valid(suspend_state_t pm_state)
 {
         u32 acpi_state;
@@ -202,6 +185,27 @@ static struct pm_ops acpi_pm_ops = {
         .finish = acpi_pm_finish,
 };
 
+/*
+ * Toshiba fails to preserve interrupts over S1, reinitialization
+ * of 8259 is needed after S1 resume.
+ */
+static int __init init_ints_after_s1(struct dmi_system_id *d)
+{
+        printk(KERN_WARNING "%s with broken S1 detected.\n", d->ident);
+        init_8259A_after_S1 = 1;
+        return 0;
+}
+
+static struct dmi_system_id __initdata acpisleep_dmi_table[] = {
+        {
+         .callback = init_ints_after_s1,
+         .ident = "Toshiba Satellite 4030cdt",
+         .matches = {DMI_MATCH(DMI_PRODUCT_NAME, "S4030CDT/4.3"),},
+         },
+        {},
+};
+#endif /* CONFIG_SUSPEND */
+
 #ifdef CONFIG_HIBERNATION
 static int acpi_hibernation_prepare(void)
 {
@@ -256,6 +260,21 @@ static struct hibernation_ops acpi_hibernation_ops = {
 };
 #endif                          /* CONFIG_HIBERNATION */
 
+int acpi_suspend(u32 acpi_state)
+{
+        suspend_state_t states[] = {
+                [1] = PM_SUSPEND_STANDBY,
+                [3] = PM_SUSPEND_MEM,
+                [5] = PM_SUSPEND_MAX
+        };
+
+        if (acpi_state < 6 && states[acpi_state])
+                return pm_suspend(states[acpi_state]);
+        if (acpi_state == 4)
+                return hibernate();
+        return -EINVAL;
+}
+
 /**
  *      acpi_pm_device_sleep_state - return preferred power state of ACPI device
  *              in the system sleep state given by %acpi_target_sleep_state
@@ -331,39 +350,22 @@ int acpi_pm_device_sleep_state(struct device *dev, int wake, int *d_min_p)
         return d_max;
 }
 
-/*
- * Toshiba fails to preserve interrupts over S1, reinitialization
- * of 8259 is needed after S1 resume.
- */
-static int __init init_ints_after_s1(struct dmi_system_id *d)
-{
-        printk(KERN_WARNING "%s with broken S1 detected.\n", d->ident);
-        init_8259A_after_S1 = 1;
-        return 0;
-}
-
-static struct dmi_system_id __initdata acpisleep_dmi_table[] = {
-        {
-         .callback = init_ints_after_s1,
-         .ident = "Toshiba Satellite 4030cdt",
-         .matches = {DMI_MATCH(DMI_PRODUCT_NAME, "S4030CDT/4.3"),},
-         },
-        {},
-};
-
 int __init acpi_sleep_init(void)
 {
+        acpi_status status;
+        u8 type_a, type_b;
+#ifdef CONFIG_SUSPEND
         int i = 0;
 
         dmi_check_system(acpisleep_dmi_table);
+#endif
 
         if (acpi_disabled)
                 return 0;
 
+#ifdef CONFIG_SUSPEND
         printk(KERN_INFO PREFIX "(supports");
-        for (i = 0; i < ACPI_S_STATE_COUNT; i++) {
-                acpi_status status;
-                u8 type_a, type_b;
+        for (i = ACPI_STATE_S0; i < ACPI_STATE_S4; i++) {
                 status = acpi_get_sleep_type_data(i, &type_a, &type_b);
                 if (ACPI_SUCCESS(status)) {
                         sleep_states[i] = 1;
@@ -373,10 +375,14 @@ int __init acpi_sleep_init(void)
         printk(")\n");
 
         pm_set_ops(&acpi_pm_ops);
+#endif
 
 #ifdef CONFIG_HIBERNATION
-        if (sleep_states[ACPI_STATE_S4])
+        status = acpi_get_sleep_type_data(ACPI_STATE_S4, &type_a, &type_b);
+        if (ACPI_SUCCESS(status)) {
                 hibernation_set_ops(&acpi_hibernation_ops);
+                sleep_states[ACPI_STATE_S4] = 1;
+        }
 #else
         sleep_states[ACPI_STATE_S4] = 0;
 #endif
diff --git a/drivers/acpi/sleep/proc.c b/drivers/acpi/sleep/proc.c
index 1b7bbb5ba623..5dfe8b789633 100644
--- a/drivers/acpi/sleep/proc.c
+++ b/drivers/acpi/sleep/proc.c
@@ -23,7 +23,7 @@
  */
 
 ACPI_MODULE_NAME("sleep")
-#ifdef  CONFIG_ACPI_PROCFS
+#ifdef  CONFIG_ACPI_PROCFS_SLEEP
 static int acpi_system_sleep_seq_show(struct seq_file *seq, void *offset)
 {
         int i;
@@ -76,7 +76,7 @@ acpi_system_write_sleep(struct file *file,
       Done:
         return error ? error : count;
 }
-#endif                          /* CONFIG_ACPI_PROCFS */
+#endif                          /* CONFIG_ACPI_PROCFS_SLEEP */
 
 #if defined(CONFIG_RTC_DRV_CMOS) || defined(CONFIG_RTC_DRV_CMOS_MODULE)
 /* use /sys/class/rtc/rtcX/wakealarm instead; it's not ACPI-specific */
@@ -471,7 +471,7 @@ static const struct file_operations acpi_system_wakeup_device_fops = {
         .release = single_release,
 };
 
-#ifdef  CONFIG_ACPI_PROCFS
+#ifdef  CONFIG_ACPI_PROCFS_SLEEP
 static const struct file_operations acpi_system_sleep_fops = {
         .open = acpi_system_sleep_open_fs,
         .read = seq_read,
@@ -479,7 +479,7 @@ static const struct file_operations acpi_system_sleep_fops = {
         .llseek = seq_lseek,
         .release = single_release,
 };
-#endif                          /* CONFIG_ACPI_PROCFS */
+#endif                          /* CONFIG_ACPI_PROCFS_SLEEP */
 
 #ifdef  HAVE_ACPI_LEGACY_ALARM
 static const struct file_operations acpi_system_alarm_fops = {
@@ -506,7 +506,7 @@ static int __init acpi_sleep_proc_init(void)
         if (acpi_disabled)
                 return 0;
 
-#ifdef  CONFIG_ACPI_PROCFS
+#ifdef  CONFIG_ACPI_PROCFS_SLEEP
         /* 'sleep' [R/W] */
         entry =
             create_proc_entry("sleep", S_IFREG | S_IRUGO | S_IWUSR,
diff --git a/drivers/acpi/sleep/sleep.h b/drivers/acpi/sleep/sleep.h
index f3e70397a7d6..ff1f8504f497 100644
--- a/drivers/acpi/sleep/sleep.h
+++ b/drivers/acpi/sleep/sleep.h
@@ -6,3 +6,5 @@ extern void acpi_enable_wakeup_device_prep(u8 sleep_state);
 extern void acpi_enable_wakeup_device(u8 sleep_state);
 extern void acpi_disable_wakeup_device(u8 sleep_state);
 extern void acpi_gpe_sleep_prepare(u32 sleep_state);
+
+extern int acpi_sleep_prepare(u32 acpi_state);