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/*
* Copyright (c) 2013-2016 NVIDIA Corporation. 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 as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* 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.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#include <linux/slab.h>
#include <linux/syscalls.h>
#include <linux/list.h>
#include <linux/completion.h>
#include <linux/workqueue.h>
#include <linux/bitops.h>
#include <linux/uaccess.h>
#include <linux/dma-mapping.h>
#include "ote_protocol.h"
/* SS operation timeout in milliseconds */
#define SS_OP_TIME_OUT 5000
static DECLARE_COMPLETION(req_ready);
static DECLARE_COMPLETION(req_complete);
static void tlk_ss_reset(void)
{
/* reset completion vars to default state */
init_completion(&req_ready);
init_completion(&req_complete);
}
int te_handle_ss_ioctl(struct file *file, unsigned int ioctl_num,
unsigned long ioctl_param)
{
int ss_cmd;
if (ioctl_num != TE_IOCTL_SS_CMD)
return -EINVAL;
if (copy_from_user(&ss_cmd, (void __user *)ioctl_param,
sizeof(ss_cmd))) {
pr_err("%s: copy from user space failed\n", __func__);
return -EFAULT;
}
switch (ss_cmd) {
case TE_IOCTL_SS_CMD_GET_NEW_REQ:
/* wait for a new request */
if (wait_for_completion_interruptible(&req_ready))
return -ENODATA;
break;
case TE_IOCTL_SS_CMD_REQ_COMPLETE:
/* signal the producer */
complete(&req_complete);
break;
default:
pr_err("%s: unknown ss_cmd 0x%x\n", __func__, ss_cmd);
return -EINVAL;
}
return 0;
}
int tlk_ss_op(void)
{
/* signal consumer */
complete(&req_ready);
/* wait for the consumer's signal */
if (!wait_for_completion_timeout(&req_complete,
msecs_to_jiffies(SS_OP_TIME_OUT))) {
/* daemon didn't respond */
tlk_ss_reset();
return OTE_ERROR_CANCEL;
}
return OTE_SUCCESS;
}
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