*
*/
-#include <linux/module.h>
-#include <linux/suspend.h>
#include <linux/kobject.h>
#include <linux/string.h>
-#include <linux/delay.h>
-#include <linux/errno.h>
-#include <linux/init.h>
-#include <linux/pm.h>
-#include <linux/console.h>
-#include <linux/cpu.h>
#include <linux/resume-trace.h>
-#include <linux/freezer.h>
-#include <linux/vmstat.h>
+#include <linux/workqueue.h>
#include "power.h"
-/*This is just an arbitrary number */
-#define FREE_PAGE_NUMBER (100)
-
DEFINE_MUTEX(pm_mutex);
-struct pm_ops *pm_ops;
-suspend_disk_method_t pm_disk_mode = PM_DISK_SHUTDOWN;
-
-/**
- * pm_set_ops - Set the global power method table.
- * @ops: Pointer to ops structure.
- */
-
-void pm_set_ops(struct pm_ops * ops)
-{
- mutex_lock(&pm_mutex);
- pm_ops = ops;
- if (ops && ops->pm_disk_mode != PM_DISK_INVALID) {
- pm_disk_mode = ops->pm_disk_mode;
- } else
- pm_disk_mode = PM_DISK_SHUTDOWN;
- mutex_unlock(&pm_mutex);
-}
-
-/**
- * pm_valid_only_mem - generic memory-only valid callback
- *
- * pm_ops 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)
-{
- 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.
- */
-
-static int suspend_prepare(suspend_state_t state)
-{
- int error;
- unsigned int free_pages;
-
- if (!pm_ops || !pm_ops->enter)
- return -EPERM;
+unsigned int pm_flags;
+EXPORT_SYMBOL(pm_flags);
- pm_prepare_console();
+#ifdef CONFIG_PM_SLEEP
- if (freeze_processes()) {
- error = -EAGAIN;
- goto Thaw;
- }
+/* Routines for PM-transition notifications */
- if ((free_pages = global_page_state(NR_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;
- }
- }
+static BLOCKING_NOTIFIER_HEAD(pm_chain_head);
- if (pm_ops->prepare) {
- if ((error = pm_ops->prepare(state)))
- goto Thaw;
- }
-
- suspend_console();
- error = device_suspend(PMSG_SUSPEND);
- if (error) {
- printk(KERN_ERR "Some devices failed to suspend\n");
- goto Resume_devices;
- }
- error = disable_nonboot_cpus();
- if (!error)
- return 0;
-
- enable_nonboot_cpus();
- Resume_devices:
- pm_finish(state);
- device_resume();
- resume_console();
- Thaw:
- thaw_processes();
- pm_restore_console();
- return error;
-}
-
-/* default implementation */
-void __attribute__ ((weak)) arch_suspend_disable_irqs(void)
+int register_pm_notifier(struct notifier_block *nb)
{
- local_irq_disable();
+ return blocking_notifier_chain_register(&pm_chain_head, nb);
}
+EXPORT_SYMBOL_GPL(register_pm_notifier);
-/* default implementation */
-void __attribute__ ((weak)) arch_suspend_enable_irqs(void)
+int unregister_pm_notifier(struct notifier_block *nb)
{
- local_irq_enable();
+ return blocking_notifier_chain_unregister(&pm_chain_head, nb);
}
+EXPORT_SYMBOL_GPL(unregister_pm_notifier);
-int suspend_enter(suspend_state_t state)
+int pm_notifier_call_chain(unsigned long val)
{
- int error = 0;
-
- 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");
- goto Done;
- }
- error = pm_ops->enter(state);
- device_power_up();
- Done:
- arch_suspend_enable_irqs();
- BUG_ON(irqs_disabled());
- return error;
+ return (blocking_notifier_call_chain(&pm_chain_head, val, NULL)
+ == NOTIFY_BAD) ? -EINVAL : 0;
}
+#ifdef CONFIG_PM_DEBUG
+int pm_test_level = TEST_NONE;
-/**
- * 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 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 void suspend_finish(suspend_state_t state)
+static ssize_t pm_test_show(struct kobject *kobj, struct kobj_attribute *attr,
+ char *buf)
{
- enable_nonboot_cpus();
- pm_finish(state);
- device_resume();
- resume_console();
- thaw_processes();
- pm_restore_console();
-}
-
+ 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';
-static const char * const pm_states[PM_SUSPEND_MAX] = {
- [PM_SUSPEND_STANDBY] = "standby",
- [PM_SUSPEND_MEM] = "mem",
-#ifdef CONFIG_SOFTWARE_SUSPEND
- [PM_SUSPEND_DISK] = "disk",
-#endif
-};
-
-static inline int valid_state(suspend_state_t state)
-{
- /* Suspend-to-disk does not really need low-level support.
- * It can work with reboot if needed. */
- if (state == PM_SUSPEND_DISK)
- return 1;
-
- /* all other 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))
- return 0;
- return 1;
+ return (s - buf);
}
-
-/**
- * enter_state - Do common work of entering low-power state.
- * @state: pm_state structure for state we're entering.
- *
- * Make sure we're the only ones trying to enter a sleep state. Fail
- * if someone has beat us to it, since we don't want anything weird to
- * happen when we wake up.
- * Then, do the setup for suspend, enter the state, and cleaup (after
- * we've woken up).
- */
-
-static int enter_state(suspend_state_t state)
+static ssize_t pm_test_store(struct kobject *kobj, struct kobj_attribute *attr,
+ const char *buf, size_t n)
{
- int error;
-
- if (!valid_state(state))
- return -ENODEV;
- if (!mutex_trylock(&pm_mutex))
- return -EBUSY;
+ const char * const *s;
+ int level;
+ char *p;
+ int len;
+ int error = -EINVAL;
- if (state == PM_SUSPEND_DISK) {
- error = pm_suspend_disk();
- goto Unlock;
- }
+ p = memchr(buf, '\n', n);
+ len = p ? p - buf : n;
- pr_debug("PM: Preparing system for %s sleep\n", pm_states[state]);
- if ((error = suspend_prepare(state)))
- goto Unlock;
+ mutex_lock(&pm_mutex);
- pr_debug("PM: Entering %s sleep\n", pm_states[state]);
- error = suspend_enter(state);
+ 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;
+ }
- pr_debug("PM: Finishing wakeup.\n");
- suspend_finish(state);
- Unlock:
mutex_unlock(&pm_mutex);
- return error;
-}
-#ifdef CONFIG_SOFTWARE_SUSPEND
-/*
- * This is main interface to the outside world. It needs to be
- * called from process context.
- */
-int software_suspend(void)
-{
- return enter_state(PM_SUSPEND_DISK);
-}
-#endif
-
-
-/**
- * pm_suspend - Externally visible function for suspending system.
- * @state: Enumarted value of state to enter.
- *
- * Determine whether or not value is within range, get state
- * structure, and enter (above).
- */
-
-int pm_suspend(suspend_state_t state)
-{
- if (state > PM_SUSPEND_ON && state <= PM_SUSPEND_MAX)
- return enter_state(state);
- return -EINVAL;
+ return error ? error : n;
}
-EXPORT_SYMBOL(pm_suspend);
+power_attr(pm_test);
+#endif /* CONFIG_PM_DEBUG */
-decl_subsys(power,NULL,NULL);
+#endif /* CONFIG_PM_SLEEP */
+struct kobject *power_kobj;
/**
* state - control system power state.
* store() accepts one of those strings, translates it into the
* 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]);
}
- s += sprintf(s,"\n");
+#endif
+#ifdef CONFIG_HIBERNATION
+ s += sprintf(s, "%s\n", "disk");
+#else
+ if (s != buf)
+ /* convert the last space to a newline */
+ *(s-1) = '\n';
+#endif
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();
+ goto Exit;
+ }
+
+#ifdef CONFIG_SUSPEND
for (s = &pm_states[state]; state < PM_SUSPEND_MAX; s++, state++) {
- if (*s && !strncmp(buf, *s, len))
+ 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,
};
+#ifdef CONFIG_PM_RUNTIME
+struct workqueue_struct *pm_wq;
+EXPORT_SYMBOL_GPL(pm_wq);
+
+static int __init pm_start_workqueue(void)
+{
+ pm_wq = create_freezeable_workqueue("pm");
+
+ return pm_wq ? 0 : -ENOMEM;
+}
+#else
+static inline int pm_start_workqueue(void) { return 0; }
+#endif
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;
+ int error = pm_start_workqueue();
+ if (error)
+ 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);
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff