+++ /dev/null
-From 48e1af2bdd11204f11b3770a6c8d3eee64aee2e8 Mon Sep 17 00:00:00 2001
-From: =?utf-8?q?Arve=20Hj=C3=B8nnev=C3=A5g?= <arve@android.com>
-Date: Thu, 9 Oct 2008 21:01:46 -0700
-Subject: [PATCH 069/134] PM: Add user-space wake lock api.
-
-This adds /sys/power/wake_lock and /sys/power/wake_unlock.
-Writing a string to wake_lock creates a wake lock the
-first time is sees a string and locks it. Optionally, the
-string can be followed by a timeout.
-To unlock the wake lock, write the same string to wake_unlock.
----
- kernel/power/Kconfig | 10 ++
- kernel/power/Makefile | 1 +
- kernel/power/main.c | 9 ++
- kernel/power/power.h | 11 ++
- kernel/power/userwakelock.c | 218 +++++++++++++++++++++++++++++++++++++++++++
- 5 files changed, 249 insertions(+), 0 deletions(-)
- create mode 100644 kernel/power/userwakelock.c
-
---- a/kernel/power/Kconfig
-+++ b/kernel/power/Kconfig
-@@ -138,6 +138,16 @@ config WAKELOCK_STAT
- ---help---
- Report wake lock stats in /proc/wakelocks
-
-+config USER_WAKELOCK
-+ bool "Userspace wake locks"
-+ depends on WAKELOCK
-+ default y
-+ ---help---
-+ User-space wake lock api. Write "lockname" or "lockname timeout"
-+ to /sys/power/wake_lock lock and if needed create a wake lock.
-+ Write "lockname" to /sys/power/wake_unlock to unlock a user wake
-+ lock.
-+
- config EARLYSUSPEND
- bool "Early suspend"
- depends on WAKELOCK
---- a/kernel/power/Makefile
-+++ b/kernel/power/Makefile
-@@ -7,6 +7,7 @@ obj-$(CONFIG_PM) += main.o
- obj-$(CONFIG_PM_SLEEP) += console.o
- obj-$(CONFIG_FREEZER) += process.o
- obj-$(CONFIG_WAKELOCK) += wakelock.o
-+obj-$(CONFIG_USER_WAKELOCK) += userwakelock.o
- obj-$(CONFIG_EARLYSUSPEND) += earlysuspend.o
- obj-$(CONFIG_HIBERNATION) += swsusp.o disk.o snapshot.o swap.o user.o
-
---- a/kernel/power/main.c
-+++ b/kernel/power/main.c
-@@ -595,6 +595,11 @@ pm_trace_store(struct kobject *kobj, str
- power_attr(pm_trace);
- #endif /* CONFIG_PM_TRACE */
-
-+#ifdef CONFIG_USER_WAKELOCK
-+power_attr(wake_lock);
-+power_attr(wake_unlock);
-+#endif
-+
- static struct attribute * g[] = {
- &state_attr.attr,
- #ifdef CONFIG_PM_TRACE
-@@ -603,6 +608,10 @@ static struct attribute * g[] = {
- #if defined(CONFIG_PM_SLEEP) && defined(CONFIG_PM_DEBUG)
- &pm_test_attr.attr,
- #endif
-+#ifdef CONFIG_USER_WAKELOCK
-+ &wake_lock_attr.attr,
-+ &wake_unlock_attr.attr,
-+#endif
- NULL,
- };
-
---- a/kernel/power/power.h
-+++ b/kernel/power/power.h
-@@ -231,6 +231,17 @@ extern struct wake_lock main_wake_lock;
- extern suspend_state_t requested_suspend_state;
- #endif
-
-+#ifdef CONFIG_USER_WAKELOCK
-+ssize_t wake_lock_show(struct kobject *kobj, struct kobj_attribute *attr,
-+ char *buf);
-+ssize_t wake_lock_store(struct kobject *kobj, struct kobj_attribute *attr,
-+ const char *buf, size_t n);
-+ssize_t wake_unlock_show(struct kobject *kobj, struct kobj_attribute *attr,
-+ char *buf);
-+ssize_t wake_unlock_store(struct kobject *kobj, struct kobj_attribute *attr,
-+ const char *buf, size_t n);
-+#endif
-+
- #ifdef CONFIG_EARLYSUSPEND
- /* kernel/power/earlysuspend.c */
- void request_suspend_state(suspend_state_t state);
---- /dev/null
-+++ b/kernel/power/userwakelock.c
-@@ -0,0 +1,218 @@
-+/* kernel/power/userwakelock.c
-+ *
-+ * Copyright (C) 2005-2008 Google, Inc.
-+ *
-+ * This software is licensed under the terms of the GNU General Public
-+ * License version 2, as published by the Free Software Foundation, and
-+ * may be copied, distributed, and modified under those terms.
-+ *
-+ * This program is distributed in the hope that it will be useful,
-+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
-+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-+ * GNU General Public License for more details.
-+ *
-+ */
-+
-+#include <linux/ctype.h>
-+#include <linux/module.h>
-+#include <linux/wakelock.h>
-+
-+#include "power.h"
-+
-+enum {
-+ DEBUG_FAILURE = BIT(0),
-+ DEBUG_ERROR = BIT(1),
-+ DEBUG_NEW = BIT(2),
-+ DEBUG_ACCESS = BIT(3),
-+ DEBUG_LOOKUP = BIT(4),
-+};
-+static int debug_mask = DEBUG_FAILURE;
-+module_param_named(debug_mask, debug_mask, int, S_IRUGO | S_IWUSR | S_IWGRP);
-+
-+static DEFINE_MUTEX(tree_lock);
-+
-+struct user_wake_lock {
-+ struct rb_node node;
-+ struct wake_lock wake_lock;
-+ char name[0];
-+};
-+struct rb_root user_wake_locks;
-+
-+static struct user_wake_lock *lookup_wake_lock_name(
-+ const char *buf, int allocate, long *timeoutptr)
-+{
-+ struct rb_node **p = &user_wake_locks.rb_node;
-+ struct rb_node *parent = NULL;
-+ struct user_wake_lock *l;
-+ int diff;
-+ u64 timeout;
-+ int name_len;
-+ const char *arg;
-+
-+ /* Find length of lock name and start of optional timeout string */
-+ arg = buf;
-+ while (*arg && !isspace(*arg))
-+ arg++;
-+ name_len = arg - buf;
-+ if (!name_len)
-+ goto bad_arg;
-+ while (isspace(*arg))
-+ arg++;
-+
-+ /* Process timeout string */
-+ if (timeoutptr && *arg) {
-+ timeout = simple_strtoull(arg, (char **)&arg, 0);
-+ while (isspace(*arg))
-+ arg++;
-+ if (*arg)
-+ goto bad_arg;
-+ /* convert timeout from nanoseconds to jiffies > 0 */
-+ timeout += (NSEC_PER_SEC / HZ) - 1;
-+ do_div(timeout, (NSEC_PER_SEC / HZ));
-+ if (timeout <= 0)
-+ timeout = 1;
-+ *timeoutptr = timeout;
-+ } else if (*arg)
-+ goto bad_arg;
-+ else if (timeoutptr)
-+ *timeoutptr = 0;
-+
-+ /* Lookup wake lock in rbtree */
-+ while (*p) {
-+ parent = *p;
-+ l = rb_entry(parent, struct user_wake_lock, node);
-+ diff = strncmp(buf, l->name, name_len);
-+ if (!diff && l->name[name_len])
-+ diff = -1;
-+ if (debug_mask & DEBUG_ERROR)
-+ pr_info("lookup_wake_lock_name: compare %.*s %s %d\n",
-+ name_len, buf, l->name, diff);
-+
-+ if (diff < 0)
-+ p = &(*p)->rb_left;
-+ else if (diff > 0)
-+ p = &(*p)->rb_right;
-+ else
-+ return l;
-+ }
-+
-+ /* Allocate and add new wakelock to rbtree */
-+ if (!allocate) {
-+ if (debug_mask & DEBUG_ERROR)
-+ pr_info("lookup_wake_lock_name: %.*s not found\n",
-+ name_len, buf);
-+ return ERR_PTR(-EINVAL);
-+ }
-+ l = kzalloc(sizeof(*l) + name_len + 1, GFP_KERNEL);
-+ if (l == NULL) {
-+ if (debug_mask & DEBUG_FAILURE)
-+ pr_err("lookup_wake_lock_name: failed to allocate "
-+ "memory for %.*s\n", name_len, buf);
-+ return ERR_PTR(-ENOMEM);
-+ }
-+ memcpy(l->name, buf, name_len);
-+ if (debug_mask & DEBUG_NEW)
-+ pr_info("lookup_wake_lock_name: new wake lock %s\n", l->name);
-+ wake_lock_init(&l->wake_lock, WAKE_LOCK_SUSPEND, l->name);
-+ rb_link_node(&l->node, parent, p);
-+ rb_insert_color(&l->node, &user_wake_locks);
-+ return l;
-+
-+bad_arg:
-+ if (debug_mask & DEBUG_ERROR)
-+ pr_info("lookup_wake_lock_name: wake lock, %.*s, bad arg, %s\n",
-+ name_len, buf, arg);
-+ return ERR_PTR(-EINVAL);
-+}
-+
-+ssize_t wake_lock_show(
-+ struct kobject *kobj, struct kobj_attribute *attr, char *buf)
-+{
-+ char *s = buf;
-+ char *end = buf + PAGE_SIZE;
-+ struct rb_node *n;
-+ struct user_wake_lock *l;
-+
-+ mutex_lock(&tree_lock);
-+
-+ for (n = rb_first(&user_wake_locks); n != NULL; n = rb_next(n)) {
-+ l = rb_entry(n, struct user_wake_lock, node);
-+ if (wake_lock_active(&l->wake_lock))
-+ s += scnprintf(s, end - s, "%s ", l->name);
-+ }
-+ s += scnprintf(s, end - s, "\n");
-+
-+ mutex_unlock(&tree_lock);
-+ return (s - buf);
-+}
-+
-+ssize_t wake_lock_store(
-+ struct kobject *kobj, struct kobj_attribute *attr,
-+ const char *buf, size_t n)
-+{
-+ long timeout;
-+ struct user_wake_lock *l;
-+
-+ mutex_lock(&tree_lock);
-+ l = lookup_wake_lock_name(buf, 1, &timeout);
-+ if (IS_ERR(l)) {
-+ n = PTR_ERR(l);
-+ goto bad_name;
-+ }
-+
-+ if (debug_mask & DEBUG_ACCESS)
-+ pr_info("wake_lock_store: %s, timeout %ld\n", l->name, timeout);
-+
-+ if (timeout)
-+ wake_lock_timeout(&l->wake_lock, timeout);
-+ else
-+ wake_lock(&l->wake_lock);
-+bad_name:
-+ mutex_unlock(&tree_lock);
-+ return n;
-+}
-+
-+
-+ssize_t wake_unlock_show(
-+ struct kobject *kobj, struct kobj_attribute *attr, char *buf)
-+{
-+ char *s = buf;
-+ char *end = buf + PAGE_SIZE;
-+ struct rb_node *n;
-+ struct user_wake_lock *l;
-+
-+ mutex_lock(&tree_lock);
-+
-+ for (n = rb_first(&user_wake_locks); n != NULL; n = rb_next(n)) {
-+ l = rb_entry(n, struct user_wake_lock, node);
-+ if (!wake_lock_active(&l->wake_lock))
-+ s += scnprintf(s, end - s, "%s ", l->name);
-+ }
-+ s += scnprintf(s, end - s, "\n");
-+
-+ mutex_unlock(&tree_lock);
-+ return (s - buf);
-+}
-+
-+ssize_t wake_unlock_store(
-+ struct kobject *kobj, struct kobj_attribute *attr,
-+ const char *buf, size_t n)
-+{
-+ struct user_wake_lock *l;
-+
-+ mutex_lock(&tree_lock);
-+ l = lookup_wake_lock_name(buf, 0, NULL);
-+ if (IS_ERR(l)) {
-+ n = PTR_ERR(l);
-+ goto not_found;
-+ }
-+
-+ if (debug_mask & DEBUG_ACCESS)
-+ pr_info("wake_unlock_store: %s\n", l->name);
-+
-+ wake_unlock(&l->wake_lock);
-+not_found:
-+ mutex_unlock(&tree_lock);
-+ return n;
-+}
-+
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