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/* Copyright (c) 2013-2014, The Linux Foundation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 and
* only version 2 as published by the Free Software Foundation.
*
* 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/jiffies.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/timer.h>
#include <linux/unistd.h>
#include <linux/workqueue.h>
#include <linux/ipa.h>
#include "ipa_i.h"
/**
* struct ipa_rm_it_private - IPA RM Inactivity Timer private
* data
* @initied: indicates if instance was initialized
* @lock - spinlock for mutual exclusion
* @resource_name - resource name
* @work: delayed work object for running delayed releas
* function
* @release_in_prog: boolean flag indicates if release resource
* is scheduled for happen in the future.
* @jiffies: number of jiffies for timeout
*
* WWAN private - holds all relevant info about WWAN driver
*/
struct ipa_rm_it_private {
bool initied;
enum ipa_rm_resource_name resource_name;
spinlock_t lock;
struct delayed_work work;
bool release_in_prog;
unsigned long jiffies;
};
static struct ipa_rm_it_private ipa_rm_it_handles[IPA_RM_RESOURCE_MAX];
/**
* ipa_rm_inactivity_timer_func() - called when timer expired in
* the context of the shared workqueue. Checks internally is
* release_in_prog flag is set and calls to
* ipa_rm_release_resource(). release_in_prog is cleared when
* calling to ipa_rm_inactivity_timer_request_resource(). In
* this situation this function shall not call to
* ipa_rm_release_resource() since the resource needs to remain
* up
*
* @work: work object provided by the work queue
*
* Return codes:
* None
*/
static void ipa_rm_inactivity_timer_func(struct work_struct *work)
{
struct ipa_rm_it_private *me = container_of(to_delayed_work(work),
struct ipa_rm_it_private,
work);
unsigned long flags;
IPADBG("%s: timer expired for resource %d!\n", __func__,
me->resource_name);
/* check that release still need to be performed */
spin_lock_irqsave(
&ipa_rm_it_handles[me->resource_name].lock, flags);
if (ipa_rm_it_handles[me->resource_name].release_in_prog) {
IPADBG("%s: calling release_resource on resource %d!\n",
__func__, me->resource_name);
ipa_rm_release_resource(me->resource_name);
ipa_rm_it_handles[me->resource_name].release_in_prog = false;
}
spin_unlock_irqrestore(
&ipa_rm_it_handles[me->resource_name].lock, flags);
}
/**
* ipa_rm_inactivity_timer_init() - Init function for IPA RM
* inactivity timer. This function shall be called prior calling
* any other API of IPA RM inactivity timer.
*
* @resource_name: Resource name. @see ipa_rm.h
* @msecs: time in miliseccond, that IPA RM inactivity timer
* shall wait prior calling to ipa_rm_release_resource().
*
* Return codes:
* 0: success
* -EINVAL: invalid parameters
*/
int ipa_rm_inactivity_timer_init(enum ipa_rm_resource_name resource_name,
unsigned long msecs)
{
IPADBG("%s: resource %d\n", __func__, resource_name);
if (resource_name < 0 ||
resource_name >= IPA_RM_RESOURCE_MAX) {
IPAERR("%s: Invalid parameter\n", __func__);
return -EINVAL;
}
if (ipa_rm_it_handles[resource_name].initied) {
IPAERR("%s: resource %d already inited\n",
__func__, resource_name);
return -EINVAL;
}
spin_lock_init(&ipa_rm_it_handles[resource_name].lock);
ipa_rm_it_handles[resource_name].resource_name = resource_name;
ipa_rm_it_handles[resource_name].jiffies = msecs_to_jiffies(msecs);
ipa_rm_it_handles[resource_name].release_in_prog = false;
INIT_DELAYED_WORK(&ipa_rm_it_handles[resource_name].work,
ipa_rm_inactivity_timer_func);
ipa_rm_it_handles[resource_name].initied = 1;
return 0;
}
EXPORT_SYMBOL(ipa_rm_inactivity_timer_init);
/**
* ipa_rm_inactivity_timer_destroy() - De-Init function for IPA
* RM inactivity timer.
*
* @resource_name: Resource name. @see ipa_rm.h
*
* Return codes:
* 0: success
* -EINVAL: invalid parameters
*/
int ipa_rm_inactivity_timer_destroy(enum ipa_rm_resource_name resource_name)
{
IPADBG("%s: resource %d\n", __func__, resource_name);
if (resource_name < 0 ||
resource_name >= IPA_RM_RESOURCE_MAX) {
IPAERR("%s: Invalid parameter\n", __func__);
return -EINVAL;
}
if (!ipa_rm_it_handles[resource_name].initied) {
IPAERR("%s: resource %d already inited\n",
__func__, resource_name);
return -EINVAL;
}
cancel_delayed_work_sync(&ipa_rm_it_handles[resource_name].work);
memset(&ipa_rm_it_handles[resource_name], 0,
sizeof(struct ipa_rm_it_private));
return 0;
}
EXPORT_SYMBOL(ipa_rm_inactivity_timer_destroy);
/**
* ipa_rm_inactivity_timer_request_resource() - Same as
* ipa_rm_request_resource(), with a difference that calling to
* this function will also cancel the inactivity timer, if
* ipa_rm_inactivity_timer_release_resource() was called earlier.
*
* @resource_name: Resource name. @see ipa_rm.h
*
* Return codes:
* 0: success
* -EINVAL: invalid parameters
*/
int ipa_rm_inactivity_timer_request_resource(
enum ipa_rm_resource_name resource_name)
{
int ret;
unsigned long flags;
IPADBG("%s: resource %d\n", __func__, resource_name);
if (resource_name < 0 ||
resource_name >= IPA_RM_RESOURCE_MAX) {
IPAERR("%s: Invalid parameter\n", __func__);
return -EINVAL;
}
if (!ipa_rm_it_handles[resource_name].initied) {
IPAERR("%s: Not initialized\n", __func__);
return -EINVAL;
}
spin_lock_irqsave(&ipa_rm_it_handles[resource_name].lock, flags);
cancel_delayed_work(&ipa_rm_it_handles[resource_name].work);
ipa_rm_it_handles[resource_name].release_in_prog = false;
spin_unlock_irqrestore(&ipa_rm_it_handles[resource_name].lock, flags);
ret = ipa_rm_request_resource(resource_name);
IPADBG("%s: resource %d: returning %d\n", __func__, resource_name, ret);
return ret;
}
EXPORT_SYMBOL(ipa_rm_inactivity_timer_request_resource);
/**
* ipa_rm_inactivity_timer_release_resource() - Sets the
* inactivity timer to the timeout set by
* ipa_rm_inactivity_timer_init(). When the timeout expires, IPA
* RM inactivity timer will call to ipa_rm_release_resource().
* If a call to ipa_rm_inactivity_timer_request_resource() was
* made BEFORE the timout has expired, rge timer will be
* cancelled.
*
* @resource_name: Resource name. @see ipa_rm.h
*
* Return codes:
* 0: success
* -EINVAL: invalid parameters
*/
int ipa_rm_inactivity_timer_release_resource(
enum ipa_rm_resource_name resource_name)
{
unsigned long flags;
IPADBG("%s: resource %d\n", __func__, resource_name);
if (resource_name < 0 ||
resource_name >= IPA_RM_RESOURCE_MAX) {
IPAERR("%s: Invalid parameter\n", __func__);
return -EINVAL;
}
if (!ipa_rm_it_handles[resource_name].initied) {
IPAERR("%s: Not initialized\n", __func__);
return -EINVAL;
}
spin_lock_irqsave(&ipa_rm_it_handles[resource_name].lock, flags);
if (ipa_rm_it_handles[resource_name].release_in_prog) {
IPADBG("%s: Timer already set, not scheduling again %d\n",
__func__, resource_name);
spin_unlock_irqrestore(
&ipa_rm_it_handles[resource_name].lock, flags);
return 0;
}
ipa_rm_it_handles[resource_name].release_in_prog = true;
spin_unlock_irqrestore(&ipa_rm_it_handles[resource_name].lock, flags);
IPADBG("%s: setting delayed work\n", __func__);
schedule_delayed_work(&ipa_rm_it_handles[resource_name].work,
ipa_rm_it_handles[resource_name].jiffies);
return 0;
}
EXPORT_SYMBOL(ipa_rm_inactivity_timer_release_resource);
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