mirror of
https://github.com/pine64/bl_iot_sdk.git
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103 lines
2.2 KiB
C
103 lines
2.2 KiB
C
/*
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* Copyright (C) 2015-2017 Alibaba Group Holding Limited
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*/
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#include "device/vfs_wdg.h"
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#include "hal/soc/soc.h"
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#include "vfs_err.h"
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/* wdg driver struct */
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const struct file_ops wdg_ops =
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{
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.open = vfs_wdg_open,
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.close = vfs_wdg_close,
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.ioctl = vfs_wdg_ioctl
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};
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int vfs_wdg_open(inode_t *inode, file_t *fp)
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{
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int ret = -1; /* return value */
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wdg_dev_t *wdg_dev = NULL; /* device pointer */
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/* check empty pointer. */
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if ((fp != NULL) && (fp->node != NULL)) {
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/* Initialize if the device is first opened. */
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if (fp->node->refs == 1) {
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/* get the device pointer. */
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wdg_dev = (wdg_dev_t *)(fp->node->i_arg);
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/* init wdg device. */
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ret = hal_wdg_init(wdg_dev);
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} else {
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ret = VFS_SUCCESS;
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}
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} else {
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ret = -EINVAL;
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}
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return ret;
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}
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int vfs_wdg_close(file_t *fp)
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{
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int ret = -1; /* return value */
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wdg_dev_t *wdg_dev = NULL; /* device pointer */
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/* check empty pointer. */
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if ((fp != NULL) && (fp->node != NULL)) {
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/* close device if the device is last closed. */
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if (fp->node->refs == 1) {
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/* get the device pointer. */
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wdg_dev = (wdg_dev_t *)(fp->node->i_arg);
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if (wdg_dev != NULL) {
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/* turns off hardware. */
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ret = hal_wdg_finalize(wdg_dev);
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} else {
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ret = -EINVAL;
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}
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} else {
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ret = VFS_SUCCESS;
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}
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} else {
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ret = -EINVAL;
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}
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return ret;
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}
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int vfs_wdg_ioctl(file_t *fp, int cmd, unsigned long arg)
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{
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int ret = -1; /* return value */
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wdg_dev_t *wdg_dev = NULL; /* device pointer */
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/* check empty pointer. */
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if ((fp == NULL) || (fp->node == NULL)) {
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return -EINVAL;
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}
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/* get the device pointer. */
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wdg_dev = (wdg_dev_t *)(fp->node->i_arg);
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if (wdg_dev == NULL) {
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return -EINVAL;
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}
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switch(cmd) {
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case IOCTL_WDG_RELOAD:
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hal_wdg_reload(wdg_dev);
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ret = VFS_SUCCESS;
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break;
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default:
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ret = -EINVAL;
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break;
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}
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return ret;
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}
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