#include <linux/resume-trace.h>
#include <linux/freezer.h>
#include <linux/vmstat.h>
+#include <linux/syscalls.h>
#include "power.h"
-/*This is just an arbitrary number */
-#define FREE_PAGE_NUMBER (100)
-
DEFINE_MUTEX(pm_mutex);
-struct pm_ops *pm_ops;
+unsigned int pm_flags;
+EXPORT_SYMBOL(pm_flags);
+
+#ifdef CONFIG_PM_SLEEP
+
+/* Routines for PM-transition notifications */
+
+static BLOCKING_NOTIFIER_HEAD(pm_chain_head);
+
+int register_pm_notifier(struct notifier_block *nb)
+{
+ return blocking_notifier_chain_register(&pm_chain_head, nb);
+}
+EXPORT_SYMBOL_GPL(register_pm_notifier);
+
+int unregister_pm_notifier(struct notifier_block *nb)
+{
+ return blocking_notifier_chain_unregister(&pm_chain_head, nb);
+}
+EXPORT_SYMBOL_GPL(unregister_pm_notifier);
+
+int pm_notifier_call_chain(unsigned long val)
+{
+ return (blocking_notifier_call_chain(&pm_chain_head, val, NULL)
+ == NOTIFY_BAD) ? -EINVAL : 0;
+}
+
+#ifdef CONFIG_PM_DEBUG
+int pm_test_level = TEST_NONE;
+
+static int suspend_test(int level)
+{
+ if (pm_test_level == level) {
+ printk(KERN_INFO "suspend debug: Waiting for 5 seconds.\n");
+ mdelay(5000);
+ return 1;
+ }
+ return 0;
+}
+
+static const char * const pm_tests[__TEST_AFTER_LAST] = {
+ [TEST_NONE] = "none",
+ [TEST_CORE] = "core",
+ [TEST_CPUS] = "processors",
+ [TEST_PLATFORM] = "platform",
+ [TEST_DEVICES] = "devices",
+ [TEST_FREEZER] = "freezer",
+};
+
+static ssize_t pm_test_show(struct kobject *kobj, struct kobj_attribute *attr,
+ char *buf)
+{
+ char *s = buf;
+ int level;
+
+ for (level = TEST_FIRST; level <= TEST_MAX; level++)
+ if (pm_tests[level]) {
+ if (level == pm_test_level)
+ s += sprintf(s, "[%s] ", pm_tests[level]);
+ else
+ s += sprintf(s, "%s ", pm_tests[level]);
+ }
+
+ if (s != buf)
+ /* convert the last space to a newline */
+ *(s-1) = '\n';
+
+ return (s - buf);
+}
+
+static ssize_t pm_test_store(struct kobject *kobj, struct kobj_attribute *attr,
+ const char *buf, size_t n)
+{
+ const char * const *s;
+ int level;
+ char *p;
+ int len;
+ int error = -EINVAL;
+
+ p = memchr(buf, '\n', n);
+ len = p ? p - buf : n;
+
+ mutex_lock(&pm_mutex);
+
+ level = TEST_FIRST;
+ for (s = &pm_tests[level]; level <= TEST_MAX; s++, level++)
+ if (*s && len == strlen(*s) && !strncmp(buf, *s, len)) {
+ pm_test_level = level;
+ error = 0;
+ break;
+ }
+
+ mutex_unlock(&pm_mutex);
+
+ return error ? error : n;
+}
+
+power_attr(pm_test);
+#else /* !CONFIG_PM_DEBUG */
+static inline int suspend_test(int level) { return 0; }
+#endif /* !CONFIG_PM_DEBUG */
+
+#endif /* CONFIG_PM_SLEEP */
+
+#ifdef CONFIG_SUSPEND
+
+/* This is just an arbitrary number */
+#define FREE_PAGE_NUMBER (100)
+
+static struct platform_suspend_ops *suspend_ops;
/**
- * pm_set_ops - Set the global power method table.
+ * suspend_set_ops - Set the global suspend method table.
* @ops: Pointer to ops structure.
*/
-void pm_set_ops(struct pm_ops * ops)
+void suspend_set_ops(struct platform_suspend_ops *ops)
{
mutex_lock(&pm_mutex);
- pm_ops = ops;
+ suspend_ops = ops;
mutex_unlock(&pm_mutex);
}
/**
- * pm_valid_only_mem - generic memory-only valid callback
+ * suspend_valid_only_mem - generic memory-only valid callback
*
- * pm_ops drivers that implement mem suspend only and only need
+ * Platform drivers that implement mem suspend only and only need
* to check for that in their .valid callback can use this instead
* of rolling their own .valid callback.
*/
-int pm_valid_only_mem(suspend_state_t state)
+int suspend_valid_only_mem(suspend_state_t state)
{
return state == PM_SUSPEND_MEM;
}
-
-static inline void pm_finish(suspend_state_t state)
-{
- if (pm_ops->finish)
- pm_ops->finish(state);
-}
-
/**
* suspend_prepare - Do prep work before entering low-power state.
- * @state: State we're entering.
*
- * This is common code that is called for each state that we're
- * entering. Allocate a console, stop all processes, then make sure
- * the platform can enter the requested state.
+ * This is common code that is called for each state that we're entering.
+ * Run suspend notifiers, allocate a console and stop all processes.
*/
-
-static int suspend_prepare(suspend_state_t state)
+static int suspend_prepare(void)
{
int error;
unsigned int free_pages;
- if (!pm_ops || !pm_ops->enter)
+ if (!suspend_ops || !suspend_ops->enter)
return -EPERM;
pm_prepare_console();
- if (freeze_processes()) {
+ error = pm_notifier_call_chain(PM_SUSPEND_PREPARE);
+ if (error)
+ goto Finish;
+
+ if (suspend_freeze_processes()) {
error = -EAGAIN;
goto Thaw;
}
- if ((free_pages = global_page_state(NR_FREE_PAGES))
- < FREE_PAGE_NUMBER) {
+ free_pages = global_page_state(NR_FREE_PAGES);
+ if (free_pages < FREE_PAGE_NUMBER) {
pr_debug("PM: free some memory\n");
shrink_all_memory(FREE_PAGE_NUMBER - free_pages);
if (nr_free_pages() < FREE_PAGE_NUMBER) {
error = -ENOMEM;
printk(KERN_ERR "PM: No enough memory\n");
- goto Thaw;
}
}
-
- if (pm_ops->set_target) {
- error = pm_ops->set_target(state);
- if (error)
- goto Thaw;
- }
- suspend_console();
- error = device_suspend(PMSG_SUSPEND);
- if (error) {
- printk(KERN_ERR "Some devices failed to suspend\n");
- goto Resume_console;
- }
- if (pm_ops->prepare) {
- if ((error = pm_ops->prepare(state)))
- goto Resume_devices;
- }
-
- error = disable_nonboot_cpus();
if (!error)
return 0;
- enable_nonboot_cpus();
- pm_finish(state);
- Resume_devices:
- device_resume();
- Resume_console:
- resume_console();
Thaw:
- thaw_processes();
+ suspend_thaw_processes();
+ Finish:
+ pm_notifier_call_chain(PM_POST_SUSPEND);
pm_restore_console();
return error;
}
local_irq_enable();
}
-int suspend_enter(suspend_state_t state)
+/**
+ * suspend_enter - enter the desired system sleep state.
+ * @state: state to enter
+ *
+ * This function should be called after devices have been suspended.
+ */
+static int suspend_enter(suspend_state_t state)
{
int error = 0;
+ device_pm_lock();
arch_suspend_disable_irqs();
BUG_ON(!irqs_disabled());
if ((error = device_power_down(PMSG_SUSPEND))) {
- printk(KERN_ERR "Some devices failed to power down\n");
+ printk(KERN_ERR "PM: Some devices failed to power down\n");
goto Done;
}
- error = pm_ops->enter(state);
- device_power_up();
+
+ if (!suspend_test(TEST_CORE))
+ error = suspend_ops->enter(state);
+
+ device_power_up(PMSG_RESUME);
Done:
arch_suspend_enable_irqs();
BUG_ON(irqs_disabled());
+ device_pm_unlock();
return error;
}
+/**
+ * suspend_devices_and_enter - suspend devices and enter the desired system
+ * sleep state.
+ * @state: state to enter
+ */
+int suspend_devices_and_enter(suspend_state_t state)
+{
+ int error;
+
+ if (!suspend_ops)
+ return -ENOSYS;
+
+ if (suspend_ops->begin) {
+ error = suspend_ops->begin(state);
+ if (error)
+ goto Close;
+ }
+ suspend_console();
+ error = device_suspend(PMSG_SUSPEND);
+ if (error) {
+ printk(KERN_ERR "PM: Some devices failed to suspend\n");
+ goto Recover_platform;
+ }
+
+ if (suspend_test(TEST_DEVICES))
+ goto Recover_platform;
+
+ if (suspend_ops->prepare) {
+ error = suspend_ops->prepare();
+ if (error)
+ goto Resume_devices;
+ }
+
+ if (suspend_test(TEST_PLATFORM))
+ goto Finish;
+
+ error = disable_nonboot_cpus();
+ if (!error && !suspend_test(TEST_CPUS))
+ suspend_enter(state);
+
+ enable_nonboot_cpus();
+ Finish:
+ if (suspend_ops->finish)
+ suspend_ops->finish();
+ Resume_devices:
+ device_resume(PMSG_RESUME);
+ resume_console();
+ Close:
+ if (suspend_ops->end)
+ suspend_ops->end();
+ return error;
+
+ Recover_platform:
+ if (suspend_ops->recover)
+ suspend_ops->recover();
+ goto Resume_devices;
+}
/**
* suspend_finish - Do final work before exiting suspend sequence.
- * @state: State we're coming out of.
*
* Call platform code to clean up, restart processes, and free the
* console that we've allocated. This is not called for suspend-to-disk.
*/
-
-static void suspend_finish(suspend_state_t state)
+static void suspend_finish(void)
{
- enable_nonboot_cpus();
- pm_finish(state);
- device_resume();
- resume_console();
- thaw_processes();
+ suspend_thaw_processes();
+ pm_notifier_call_chain(PM_POST_SUSPEND);
pm_restore_console();
}
/* All states need lowlevel support and need to be valid
* to the lowlevel implementation, no valid callback
* implies that none are valid. */
- if (!pm_ops || !pm_ops->valid || !pm_ops->valid(state))
+ if (!suspend_ops || !suspend_ops->valid || !suspend_ops->valid(state))
return 0;
return 1;
}
* Then, do the setup for suspend, enter the state, and cleaup (after
* we've woken up).
*/
-
static int enter_state(suspend_state_t state)
{
int error;
if (!valid_state(state))
return -ENODEV;
+
if (!mutex_trylock(&pm_mutex))
return -EBUSY;
+ printk(KERN_INFO "PM: Syncing filesystems ... ");
+ sys_sync();
+ printk("done.\n");
+
pr_debug("PM: Preparing system for %s sleep\n", pm_states[state]);
- if ((error = suspend_prepare(state)))
+ error = suspend_prepare();
+ if (error)
goto Unlock;
+ if (suspend_test(TEST_FREEZER))
+ goto Finish;
+
pr_debug("PM: Entering %s sleep\n", pm_states[state]);
- error = suspend_enter(state);
+ error = suspend_devices_and_enter(state);
+ Finish:
pr_debug("PM: Finishing wakeup.\n");
- suspend_finish(state);
+ suspend_finish();
Unlock:
mutex_unlock(&pm_mutex);
return error;
EXPORT_SYMBOL(pm_suspend);
-decl_subsys(power,NULL,NULL);
+#endif /* CONFIG_SUSPEND */
+struct kobject *power_kobj;
/**
* state - control system power state.
* proper enumerated value, and initiates a suspend transition.
*/
-static ssize_t state_show(struct kset *kset, char *buf)
+static ssize_t state_show(struct kobject *kobj, struct kobj_attribute *attr,
+ char *buf)
{
+ char *s = buf;
+#ifdef CONFIG_SUSPEND
int i;
- char * s = buf;
for (i = 0; i < PM_SUSPEND_MAX; i++) {
if (pm_states[i] && valid_state(i))
s += sprintf(s,"%s ", pm_states[i]);
}
-#ifdef CONFIG_SOFTWARE_SUSPEND
+#endif
+#ifdef CONFIG_HIBERNATION
s += sprintf(s, "%s\n", "disk");
#else
if (s != buf)
return (s - buf);
}
-static ssize_t state_store(struct kset *kset, const char *buf, size_t n)
+static ssize_t state_store(struct kobject *kobj, struct kobj_attribute *attr,
+ const char *buf, size_t n)
{
+#ifdef CONFIG_SUSPEND
suspend_state_t state = PM_SUSPEND_STANDBY;
const char * const *s;
+#endif
char *p;
- int error;
int len;
+ int error = -EINVAL;
p = memchr(buf, '\n', n);
len = p ? p - buf : n;
/* First, check if we are requested to hibernate */
if (len == 4 && !strncmp(buf, "disk", len)) {
error = hibernate();
- return error ? error : n;
+ goto Exit;
}
+#ifdef CONFIG_SUSPEND
for (s = &pm_states[state]; state < PM_SUSPEND_MAX; s++, state++) {
if (*s && len == strlen(*s) && !strncmp(buf, *s, len))
break;
}
if (state < PM_SUSPEND_MAX && *s)
error = enter_state(state);
- else
- error = -EINVAL;
+#endif
+
+ Exit:
return error ? error : n;
}
#ifdef CONFIG_PM_TRACE
int pm_trace_enabled;
-static ssize_t pm_trace_show(struct kset *kset, char *buf)
+static ssize_t pm_trace_show(struct kobject *kobj, struct kobj_attribute *attr,
+ char *buf)
{
return sprintf(buf, "%d\n", pm_trace_enabled);
}
static ssize_t
-pm_trace_store(struct kset *kset, const char *buf, size_t n)
+pm_trace_store(struct kobject *kobj, struct kobj_attribute *attr,
+ const char *buf, size_t n)
{
int val;
}
power_attr(pm_trace);
+#endif /* CONFIG_PM_TRACE */
static struct attribute * g[] = {
&state_attr.attr,
+#ifdef CONFIG_PM_TRACE
&pm_trace_attr.attr,
+#endif
+#if defined(CONFIG_PM_SLEEP) && defined(CONFIG_PM_DEBUG)
+ &pm_test_attr.attr,
+#endif
NULL,
};
-#else
-static struct attribute * g[] = {
- &state_attr.attr,
- NULL,
-};
-#endif /* CONFIG_PM_TRACE */
static struct attribute_group attr_group = {
.attrs = g,
static int __init pm_init(void)
{
- int error = subsystem_register(&power_subsys);
- if (!error)
- error = sysfs_create_group(&power_subsys.kobj,&attr_group);
- return error;
+ power_kobj = kobject_create_and_add("power", NULL);
+ if (!power_kobj)
+ return -ENOMEM;
+ return sysfs_create_group(power_kobj, &attr_group);
}
core_initcall(pm_init);
projects / linux-2.6-omap-h63xx.git / blobdiff