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/*****************************************************************************
(c) Cambridge Silicon Radio Limited 2010
All rights reserved and confidential information of CSR
Refer to LICENSE.txt included with this source for details
on the license terms.
*****************************************************************************/
#include <linux/kernel.h>
#include <linux/version.h>
#include <linux/kthread.h>
#include <linux/module.h>
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 34)
#include <linux/slab.h>
#endif
#if LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 19)
#include <linux/freezer.h>
#endif
#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 27)
#include <asm/semaphore.h>
#else
#include <linux/semaphore.h>
#endif
#include <linux/bitops.h>
#include "csr_framework_ext.h"
#include "csr_panic.h"
/*----------------------------------------------------------------------------*
* NAME
* CsrMutexCreate
*
* DESCRIPTION
* Create a mutex and return a handle to the created mutex.
*
* RETURNS
* Possible values:
* CSR_RESULT_SUCCESS in case of success
* CSR_FE_RESULT_NO_MORE_MUTEXES in case of out of mutex resources
* CSR_FE_RESULT_INVALID_POINTER in case the mutexHandle pointer is invalid
*
*----------------------------------------------------------------------------*/
CsrResult CsrMutexCreate(CsrMutexHandle *mutexHandle)
{
if (mutexHandle == NULL)
{
return CSR_FE_RESULT_INVALID_POINTER;
}
sema_init(mutexHandle, 1);
return CSR_RESULT_SUCCESS;
}
/*----------------------------------------------------------------------------*
* NAME
* CsrMutexDestroy
*
* DESCRIPTION
* Destroy the previously created mutex.
*
* RETURNS
* void
*
*----------------------------------------------------------------------------*/
void CsrMutexDestroy(CsrMutexHandle *mutexHandle)
{
}
/*----------------------------------------------------------------------------*
* NAME
* CsrMutexLock
*
* DESCRIPTION
* Lock the mutex refered to by the provided handle.
*
* RETURNS
* Possible values:
* CSR_RESULT_SUCCESS in case of success
* CSR_FE_RESULT_INVALID_HANDLE in case the mutexHandle is invalid
*
*----------------------------------------------------------------------------*/
CsrResult CsrMutexLock(CsrMutexHandle *mutexHandle)
{
if (mutexHandle == NULL)
{
return CSR_FE_RESULT_INVALID_POINTER;
}
if (down_interruptible(mutexHandle))
{
CsrPanic(CSR_TECH_FW, CSR_PANIC_FW_UNEXPECTED_VALUE, "CsrMutexLock Failed");
return CSR_FE_RESULT_INVALID_POINTER;
}
return CSR_RESULT_SUCCESS;
}
/*----------------------------------------------------------------------------*
* NAME
* CsrMutexUnlock
*
* DESCRIPTION
* Unlock the mutex refered to by the provided handle.
*
* RETURNS
* Possible values:
* CSR_RESULT_SUCCESS in case of success
* CSR_FE_RESULT_INVALID_HANDLE in case the mutexHandle is invalid
*
*----------------------------------------------------------------------------*/
CsrResult CsrMutexUnlock(CsrMutexHandle *mutexHandle)
{
if (mutexHandle == NULL)
{
return CSR_FE_RESULT_INVALID_POINTER;
}
up(mutexHandle);
return CSR_RESULT_SUCCESS;
}
/*----------------------------------------------------------------------------*
* NAME
* CsrThreadSleep
*
* DESCRIPTION
* Sleep for a given period.
*
* RETURNS
* void
*
*----------------------------------------------------------------------------*/
void CsrThreadSleep(u16 sleepTimeInMs)
{
unsigned long t;
/* Convert t in ms to jiffies and round up */
t = ((sleepTimeInMs * HZ) + 999) / 1000;
schedule_timeout_uninterruptible(t);
}
EXPORT_SYMBOL_GPL(CsrThreadSleep);
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