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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/kernel.h>
#include <linux/module.h>
#include <linux/types.h>
#include <linux/delay.h>
#include <linux/slab.h>
#include <linux/wait.h>
#include <linux/sched.h>
#include <linux/mfd/wcd9xxx/core-resource.h>
static enum wcd9xxx_intf_status wcd9xxx_intf = -1;
int wcd9xxx_core_irq_init(
struct wcd9xxx_core_resource *wcd9xxx_core_res)
{
int ret = 0;
if (wcd9xxx_core_res->irq != 1) {
ret = wcd9xxx_irq_init(wcd9xxx_core_res);
if (ret)
pr_err("IRQ initialization failed\n");
}
return ret;
}
EXPORT_SYMBOL(wcd9xxx_core_irq_init);
int wcd9xxx_initialize_irq(
struct wcd9xxx_core_resource *wcd9xxx_core_res,
unsigned int irq,
unsigned int irq_base)
{
wcd9xxx_core_res->irq = irq;
wcd9xxx_core_res->irq_base = irq_base;
return 0;
}
EXPORT_SYMBOL(wcd9xxx_initialize_irq);
int wcd9xxx_core_res_init(
struct wcd9xxx_core_resource *wcd9xxx_core_res,
int num_irqs, int num_irq_regs,
int (*codec_read)(struct wcd9xxx_core_resource*, unsigned short),
int (*codec_write)(struct wcd9xxx_core_resource*, unsigned short, u8),
int (*codec_bulk_read) (struct wcd9xxx_core_resource*, unsigned short,
int, u8*),
int (*codec_bulk_write) (struct wcd9xxx_core_resource*, unsigned short,
int, u8*))
{
mutex_init(&wcd9xxx_core_res->pm_lock);
wcd9xxx_core_res->wlock_holders = 0;
wcd9xxx_core_res->pm_state = WCD9XXX_PM_SLEEPABLE;
init_waitqueue_head(&wcd9xxx_core_res->pm_wq);
pm_qos_add_request(&wcd9xxx_core_res->pm_qos_req,
PM_QOS_CPU_DMA_LATENCY,
PM_QOS_DEFAULT_VALUE);
wcd9xxx_core_res->codec_reg_read = codec_read;
wcd9xxx_core_res->codec_reg_write = codec_write;
wcd9xxx_core_res->codec_bulk_read = codec_bulk_read;
wcd9xxx_core_res->codec_bulk_write = codec_bulk_write;
wcd9xxx_core_res->num_irqs = num_irqs;
wcd9xxx_core_res->num_irq_regs = num_irq_regs;
pr_info("%s: num_irqs = %d, num_irq_regs = %d\n",
__func__, wcd9xxx_core_res->num_irqs,
wcd9xxx_core_res->num_irq_regs);
return 0;
}
EXPORT_SYMBOL(wcd9xxx_core_res_init);
void wcd9xxx_core_res_deinit(struct wcd9xxx_core_resource *wcd9xxx_core_res)
{
pm_qos_remove_request(&wcd9xxx_core_res->pm_qos_req);
mutex_destroy(&wcd9xxx_core_res->pm_lock);
wcd9xxx_core_res->codec_reg_read = NULL;
wcd9xxx_core_res->codec_reg_write = NULL;
wcd9xxx_core_res->codec_bulk_read = NULL;
}
EXPORT_SYMBOL(wcd9xxx_core_res_deinit);
enum wcd9xxx_pm_state wcd9xxx_pm_cmpxchg(
struct wcd9xxx_core_resource *wcd9xxx_core_res,
enum wcd9xxx_pm_state o,
enum wcd9xxx_pm_state n)
{
enum wcd9xxx_pm_state old;
mutex_lock(&wcd9xxx_core_res->pm_lock);
old = wcd9xxx_core_res->pm_state;
if (old == o)
wcd9xxx_core_res->pm_state = n;
mutex_unlock(&wcd9xxx_core_res->pm_lock);
return old;
}
EXPORT_SYMBOL(wcd9xxx_pm_cmpxchg);
int wcd9xxx_core_res_suspend(
struct wcd9xxx_core_resource *wcd9xxx_core_res,
pm_message_t pmesg)
{
int ret = 0;
pr_debug("%s: enter\n", __func__);
/*
* pm_qos_update_request() can be called after this suspend chain call
* started. thus suspend can be called while lock is being held
*/
mutex_lock(&wcd9xxx_core_res->pm_lock);
if (wcd9xxx_core_res->pm_state == WCD9XXX_PM_SLEEPABLE) {
pr_debug("%s: suspending system, state %d, wlock %d\n",
__func__, wcd9xxx_core_res->pm_state,
wcd9xxx_core_res->wlock_holders);
wcd9xxx_core_res->pm_state = WCD9XXX_PM_ASLEEP;
} else if (wcd9xxx_core_res->pm_state == WCD9XXX_PM_AWAKE) {
/*
* unlock to wait for pm_state == WCD9XXX_PM_SLEEPABLE
* then set to WCD9XXX_PM_ASLEEP
*/
pr_debug("%s: waiting to suspend system, state %d, wlock %d\n",
__func__, wcd9xxx_core_res->pm_state,
wcd9xxx_core_res->wlock_holders);
mutex_unlock(&wcd9xxx_core_res->pm_lock);
if (!(wait_event_timeout(wcd9xxx_core_res->pm_wq,
wcd9xxx_pm_cmpxchg(wcd9xxx_core_res,
WCD9XXX_PM_SLEEPABLE,
WCD9XXX_PM_ASLEEP) ==
WCD9XXX_PM_SLEEPABLE,
HZ))) {
pr_debug("%s: suspend failed state %d, wlock %d\n",
__func__, wcd9xxx_core_res->pm_state,
wcd9xxx_core_res->wlock_holders);
ret = -EBUSY;
} else {
pr_debug("%s: done, state %d, wlock %d\n", __func__,
wcd9xxx_core_res->pm_state,
wcd9xxx_core_res->wlock_holders);
}
mutex_lock(&wcd9xxx_core_res->pm_lock);
} else if (wcd9xxx_core_res->pm_state == WCD9XXX_PM_ASLEEP) {
pr_warn("%s: system is already suspended, state %d, wlock %dn",
__func__, wcd9xxx_core_res->pm_state,
wcd9xxx_core_res->wlock_holders);
}
mutex_unlock(&wcd9xxx_core_res->pm_lock);
return ret;
}
EXPORT_SYMBOL(wcd9xxx_core_res_suspend);
int wcd9xxx_core_res_resume(
struct wcd9xxx_core_resource *wcd9xxx_core_res)
{
int ret = 0;
pr_debug("%s: enter\n", __func__);
mutex_lock(&wcd9xxx_core_res->pm_lock);
if (wcd9xxx_core_res->pm_state == WCD9XXX_PM_ASLEEP) {
pr_debug("%s: resuming system, state %d, wlock %d\n", __func__,
wcd9xxx_core_res->pm_state,
wcd9xxx_core_res->wlock_holders);
wcd9xxx_core_res->pm_state = WCD9XXX_PM_SLEEPABLE;
} else {
pr_warn("%s: system is already awake, state %d wlock %d\n",
__func__, wcd9xxx_core_res->pm_state,
wcd9xxx_core_res->wlock_holders);
}
mutex_unlock(&wcd9xxx_core_res->pm_lock);
wake_up_all(&wcd9xxx_core_res->pm_wq);
return ret;
}
EXPORT_SYMBOL(wcd9xxx_core_res_resume);
enum wcd9xxx_intf_status wcd9xxx_get_intf_type(void)
{
return wcd9xxx_intf;
}
EXPORT_SYMBOL(wcd9xxx_get_intf_type);
void wcd9xxx_set_intf_type(enum wcd9xxx_intf_status intf_status)
{
wcd9xxx_intf = intf_status;
}
EXPORT_SYMBOL(wcd9xxx_set_intf_type);
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