PM / Sleep: Add user space interface for manipulating wakeup sources, v3
[linux-2.6.git] / kernel / power / main.c
index 7b5db6a..54ec071 100644 (file)
@@ -3,23 +3,23 @@
  *
  * Copyright (c) 2003 Patrick Mochel
  * Copyright (c) 2003 Open Source Development Lab
- * 
+ *
  * This file is released under the GPLv2
  *
  */
 
+#include <linux/export.h>
 #include <linux/kobject.h>
 #include <linux/string.h>
 #include <linux/resume-trace.h>
 #include <linux/workqueue.h>
+#include <linux/debugfs.h>
+#include <linux/seq_file.h>
 
 #include "power.h"
 
 DEFINE_MUTEX(pm_mutex);
 
-unsigned int pm_flags;
-EXPORT_SYMBOL(pm_flags);
-
 #ifdef CONFIG_PM_SLEEP
 
 /* Routines for PM-transition notifications */
@@ -40,8 +40,9 @@ 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;
+       int ret = blocking_notifier_call_chain(&pm_chain_head, val, NULL);
+
+       return notifier_to_errno(ret);
 }
 
 /* If set, devices may be suspended and resumed asynchronously. */
@@ -115,7 +116,7 @@ static ssize_t pm_test_store(struct kobject *kobj, struct kobj_attribute *attr,
        p = memchr(buf, '\n', n);
        len = p ? p - buf : n;
 
-       mutex_lock(&pm_mutex);
+       lock_system_sleep();
 
        level = TEST_FIRST;
        for (s = &pm_tests[level]; level <= TEST_MAX; s++, level++)
@@ -125,7 +126,7 @@ static ssize_t pm_test_store(struct kobject *kobj, struct kobj_attribute *attr,
                        break;
                }
 
-       mutex_unlock(&pm_mutex);
+       unlock_system_sleep();
 
        return error ? error : n;
 }
@@ -133,6 +134,105 @@ static ssize_t pm_test_store(struct kobject *kobj, struct kobj_attribute *attr,
 power_attr(pm_test);
 #endif /* CONFIG_PM_DEBUG */
 
+#ifdef CONFIG_DEBUG_FS
+static char *suspend_step_name(enum suspend_stat_step step)
+{
+       switch (step) {
+       case SUSPEND_FREEZE:
+               return "freeze";
+       case SUSPEND_PREPARE:
+               return "prepare";
+       case SUSPEND_SUSPEND:
+               return "suspend";
+       case SUSPEND_SUSPEND_NOIRQ:
+               return "suspend_noirq";
+       case SUSPEND_RESUME_NOIRQ:
+               return "resume_noirq";
+       case SUSPEND_RESUME:
+               return "resume";
+       default:
+               return "";
+       }
+}
+
+static int suspend_stats_show(struct seq_file *s, void *unused)
+{
+       int i, index, last_dev, last_errno, last_step;
+
+       last_dev = suspend_stats.last_failed_dev + REC_FAILED_NUM - 1;
+       last_dev %= REC_FAILED_NUM;
+       last_errno = suspend_stats.last_failed_errno + REC_FAILED_NUM - 1;
+       last_errno %= REC_FAILED_NUM;
+       last_step = suspend_stats.last_failed_step + REC_FAILED_NUM - 1;
+       last_step %= REC_FAILED_NUM;
+       seq_printf(s, "%s: %d\n%s: %d\n%s: %d\n%s: %d\n%s: %d\n"
+                       "%s: %d\n%s: %d\n%s: %d\n%s: %d\n%s: %d\n",
+                       "success", suspend_stats.success,
+                       "fail", suspend_stats.fail,
+                       "failed_freeze", suspend_stats.failed_freeze,
+                       "failed_prepare", suspend_stats.failed_prepare,
+                       "failed_suspend", suspend_stats.failed_suspend,
+                       "failed_suspend_late",
+                               suspend_stats.failed_suspend_late,
+                       "failed_suspend_noirq",
+                               suspend_stats.failed_suspend_noirq,
+                       "failed_resume", suspend_stats.failed_resume,
+                       "failed_resume_early",
+                               suspend_stats.failed_resume_early,
+                       "failed_resume_noirq",
+                               suspend_stats.failed_resume_noirq);
+       seq_printf(s,   "failures:\n  last_failed_dev:\t%-s\n",
+                       suspend_stats.failed_devs[last_dev]);
+       for (i = 1; i < REC_FAILED_NUM; i++) {
+               index = last_dev + REC_FAILED_NUM - i;
+               index %= REC_FAILED_NUM;
+               seq_printf(s, "\t\t\t%-s\n",
+                       suspend_stats.failed_devs[index]);
+       }
+       seq_printf(s,   "  last_failed_errno:\t%-d\n",
+                       suspend_stats.errno[last_errno]);
+       for (i = 1; i < REC_FAILED_NUM; i++) {
+               index = last_errno + REC_FAILED_NUM - i;
+               index %= REC_FAILED_NUM;
+               seq_printf(s, "\t\t\t%-d\n",
+                       suspend_stats.errno[index]);
+       }
+       seq_printf(s,   "  last_failed_step:\t%-s\n",
+                       suspend_step_name(
+                               suspend_stats.failed_steps[last_step]));
+       for (i = 1; i < REC_FAILED_NUM; i++) {
+               index = last_step + REC_FAILED_NUM - i;
+               index %= REC_FAILED_NUM;
+               seq_printf(s, "\t\t\t%-s\n",
+                       suspend_step_name(
+                               suspend_stats.failed_steps[index]));
+       }
+
+       return 0;
+}
+
+static int suspend_stats_open(struct inode *inode, struct file *file)
+{
+       return single_open(file, suspend_stats_show, NULL);
+}
+
+static const struct file_operations suspend_stats_operations = {
+       .open           = suspend_stats_open,
+       .read           = seq_read,
+       .llseek         = seq_lseek,
+       .release        = single_release,
+};
+
+static int __init pm_debugfs_init(void)
+{
+       debugfs_create_file("suspend_stats", S_IFREG | S_IRUGO,
+                       NULL, NULL, &suspend_stats_operations);
+       return 0;
+}
+
+late_initcall(pm_debugfs_init);
+#endif /* CONFIG_DEBUG_FS */
+
 #endif /* CONFIG_PM_SLEEP */
 
 struct kobject *power_kobj;
@@ -144,7 +244,7 @@ struct kobject *power_kobj;
  *     'standby' (Power-On Suspend), 'mem' (Suspend-to-RAM), and
  *     'disk' (Suspend-to-Disk).
  *
- *     store() accepts one of those strings, translates it into the 
+ *     store() accepts one of those strings, translates it into the
  *     proper enumerated value, and initiates a suspend transition.
  */
 static ssize_t state_show(struct kobject *kobj, struct kobj_attribute *attr,
@@ -169,8 +269,7 @@ static ssize_t state_show(struct kobject *kobj, struct kobj_attribute *attr,
        return (s - buf);
 }
 
-static ssize_t state_store(struct kobject *kobj, struct kobj_attribute *attr,
-                          const char *buf, size_t n)
+static suspend_state_t decode_state(const char *buf, size_t n)
 {
 #ifdef CONFIG_SUSPEND
        suspend_state_t state = PM_SUSPEND_STANDBY;
@@ -178,27 +277,48 @@ static ssize_t state_store(struct kobject *kobj, struct kobj_attribute *attr,
 #endif
        char *p;
        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;
-       }
+       /* Check hibernation first. */
+       if (len == 4 && !strncmp(buf, "disk", len))
+               return PM_SUSPEND_MAX;
 
 #ifdef CONFIG_SUSPEND
-       for (s = &pm_states[state]; state < PM_SUSPEND_MAX; s++, state++) {
+       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);
+                       return state;
 #endif
 
- Exit:
+       return PM_SUSPEND_ON;
+}
+
+static ssize_t state_store(struct kobject *kobj, struct kobj_attribute *attr,
+                          const char *buf, size_t n)
+{
+       suspend_state_t state;
+       int error;
+
+       error = pm_autosleep_lock();
+       if (error)
+               return error;
+
+       if (pm_autosleep_state() > PM_SUSPEND_ON) {
+               error = -EBUSY;
+               goto out;
+       }
+
+       state = decode_state(buf, n);
+       if (state < PM_SUSPEND_MAX)
+               error = pm_suspend(state);
+       else if (state == PM_SUSPEND_MAX)
+               error = hibernate();
+       else
+               error = -EINVAL;
+
+ out:
+       pm_autosleep_unlock();
        return error ? error : n;
 }
 
@@ -227,7 +347,7 @@ power_attr(state);
  * writing to 'state'.  It first should read from 'wakeup_count' and store
  * the read value.  Then, after carrying out its own preparations for the system
  * transition to a sleep state, it should write the stored value to
- * 'wakeup_count'.  If that fails, at least one wakeup event has occured since
+ * 'wakeup_count'.  If that fails, at least one wakeup event has occurred since
  * 'wakeup_count' was read and 'state' should not be written to.  Otherwise, it
  * is allowed to write to 'state', but the transition will be aborted if there
  * are any wakeup events detected after 'wakeup_count' was written to.
@@ -239,7 +359,8 @@ static ssize_t wakeup_count_show(struct kobject *kobj,
 {
        unsigned int val;
 
-       return pm_get_wakeup_count(&val) ? sprintf(buf, "%u\n", val) : -EINTR;
+       return pm_get_wakeup_count(&val, true) ?
+               sprintf(buf, "%u\n", val) : -EINTR;
 }
 
 static ssize_t wakeup_count_store(struct kobject *kobj,
@@ -247,15 +368,106 @@ static ssize_t wakeup_count_store(struct kobject *kobj,
                                const char *buf, size_t n)
 {
        unsigned int val;
+       int error;
+
+       error = pm_autosleep_lock();
+       if (error)
+               return error;
 
+       if (pm_autosleep_state() > PM_SUSPEND_ON) {
+               error = -EBUSY;
+               goto out;
+       }
+
+       error = -EINVAL;
        if (sscanf(buf, "%u", &val) == 1) {
                if (pm_save_wakeup_count(val))
-                       return n;
+                       error = n;
        }
-       return -EINVAL;
+
+ out:
+       pm_autosleep_unlock();
+       return error;
 }
 
 power_attr(wakeup_count);
+
+#ifdef CONFIG_PM_AUTOSLEEP
+static ssize_t autosleep_show(struct kobject *kobj,
+                             struct kobj_attribute *attr,
+                             char *buf)
+{
+       suspend_state_t state = pm_autosleep_state();
+
+       if (state == PM_SUSPEND_ON)
+               return sprintf(buf, "off\n");
+
+#ifdef CONFIG_SUSPEND
+       if (state < PM_SUSPEND_MAX)
+               return sprintf(buf, "%s\n", valid_state(state) ?
+                                               pm_states[state] : "error");
+#endif
+#ifdef CONFIG_HIBERNATION
+       return sprintf(buf, "disk\n");
+#else
+       return sprintf(buf, "error");
+#endif
+}
+
+static ssize_t autosleep_store(struct kobject *kobj,
+                              struct kobj_attribute *attr,
+                              const char *buf, size_t n)
+{
+       suspend_state_t state = decode_state(buf, n);
+       int error;
+
+       if (state == PM_SUSPEND_ON
+           && !(strncmp(buf, "off", 3) && strncmp(buf, "off\n", 4)))
+               return -EINVAL;
+
+       error = pm_autosleep_set_state(state);
+       return error ? error : n;
+}
+
+power_attr(autosleep);
+#endif /* CONFIG_PM_AUTOSLEEP */
+
+#ifdef CONFIG_PM_WAKELOCKS
+static ssize_t wake_lock_show(struct kobject *kobj,
+                             struct kobj_attribute *attr,
+                             char *buf)
+{
+       return pm_show_wakelocks(buf, true);
+}
+
+static ssize_t wake_lock_store(struct kobject *kobj,
+                              struct kobj_attribute *attr,
+                              const char *buf, size_t n)
+{
+       int error = pm_wake_lock(buf);
+       return error ? error : n;
+}
+
+power_attr(wake_lock);
+
+static ssize_t wake_unlock_show(struct kobject *kobj,
+                               struct kobj_attribute *attr,
+                               char *buf)
+{
+       return pm_show_wakelocks(buf, false);
+}
+
+static ssize_t wake_unlock_store(struct kobject *kobj,
+                                struct kobj_attribute *attr,
+                                const char *buf, size_t n)
+{
+       int error = pm_wake_unlock(buf);
+       return error ? error : n;
+}
+
+power_attr(wake_unlock);
+
+#endif /* CONFIG_PM_WAKELOCKS */
 #endif /* CONFIG_PM_SLEEP */
 
 #ifdef CONFIG_PM_TRACE
@@ -309,6 +521,13 @@ static struct attribute * g[] = {
 #ifdef CONFIG_PM_SLEEP
        &pm_async_attr.attr,
        &wakeup_count_attr.attr,
+#ifdef CONFIG_PM_AUTOSLEEP
+       &autosleep_attr.attr,
+#endif
+#ifdef CONFIG_PM_WAKELOCKS
+       &wake_lock_attr.attr,
+       &wake_unlock_attr.attr,
+#endif
 #ifdef CONFIG_PM_DEBUG
        &pm_test_attr.attr,
 #endif
@@ -326,7 +545,7 @@ EXPORT_SYMBOL_GPL(pm_wq);
 
 static int __init pm_start_workqueue(void)
 {
-       pm_wq = alloc_workqueue("pm", WQ_FREEZEABLE, 0);
+       pm_wq = alloc_workqueue("pm", WQ_FREEZABLE, 0);
 
        return pm_wq ? 0 : -ENOMEM;
 }
@@ -340,10 +559,14 @@ static int __init pm_init(void)
        if (error)
                return error;
        hibernate_image_size_init();
+       hibernate_reserved_size_init();
        power_kobj = kobject_create_and_add("power", NULL);
        if (!power_kobj)
                return -ENOMEM;
-       return sysfs_create_group(power_kobj, &attr_group);
+       error = sysfs_create_group(power_kobj, &attr_group);
+       if (error)
+               return error;
+       return pm_autosleep_init();
 }
 
 core_initcall(pm_init);