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3bc544d9f3
image_conf, make_scripts_riscv - Delete trailing spaces. Change tabs to 4 space multiples.
.c and .h get tabs expanded to four spaces for consistency, traliing whitespace whacked.
Makefiles do NOT get tabs changed.
144 lines
3.4 KiB
C
144 lines
3.4 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_i2c.h"
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#include "hal/soc/soc.h"
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#include "vfs_err.h"
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/* i2c driver struct */
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const struct file_ops i2c_ops =
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{
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.open = vfs_i2c_open,
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.close = vfs_i2c_close,
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.read = vfs_i2c_read,
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.write = vfs_i2c_write
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};
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int vfs_i2c_open(inode_t *inode, file_t *fp)
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{
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int ret = -1; /* return value */
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i2c_dev_t *i2c_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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i2c_dev = (i2c_dev_t *)(fp->node->i_arg);
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/* init i2c device. */
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ret = hal_i2c_init(i2c_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_i2c_close(file_t *fp)
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{
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int ret = -1; /* return value */
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i2c_dev_t *i2c_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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i2c_dev = (i2c_dev_t *)(fp->node->i_arg);
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if (i2c_dev != NULL) {
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/* turns off hardware. */
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ret = hal_i2c_finalize(i2c_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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ssize_t vfs_i2c_read(file_t *fp, void *buf, size_t nbytes)
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{
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int ret = -1; /* return value */
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i2c_dev_t *i2c_dev = NULL; /* device pointer */
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uint16_t dev_addr = 0; /* dev address */
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/* check empty pointer. */
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if ((fp != NULL) && (fp->node != NULL)) {
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/* get the device pointer. */
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i2c_dev = (i2c_dev_t *)(fp->node->i_arg);
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/* get the device address. */
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dev_addr = i2c_dev->config.dev_addr;
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if (dev_addr != NULL) {
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/* get data from i2c. */
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ret = hal_i2c_master_recv(i2c_dev, dev_addr, (uint8_t *)buf, nbytes, HAL_WAIT_FOREVER);
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/* If the data is read correctly, the return
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value is set to read bytes. */
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if (ret == 0) {
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ret = nbytes;
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}
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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 = -EINVAL;
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}
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return ret;
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}
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ssize_t vfs_i2c_write(file_t *fp, const void *buf, size_t nbytes)
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{
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int ret = -1; /* return value */
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i2c_dev_t *i2c_dev = NULL; /* device pointer */
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uint16_t dev_addr = 0; /* dev address */
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/* check empty pointer. */
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if ((fp != NULL) && (fp->node != NULL)) {
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/* get the device pointer. */
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i2c_dev = (i2c_dev_t *)(fp->node->i_arg);
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/* get the device address. */
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dev_addr = i2c_dev->config.dev_addr;
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if (dev_addr != NULL) {
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/* send data from i2c. */
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ret = hal_i2c_master_send(i2c_dev, dev_addr, (const uint8_t *)buf, nbytes, HAL_WAIT_FOREVER);
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/* If the data is sent successfully, set the return
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value to nbytes. */
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if (ret == 0) {
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ret = nbytes;
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}
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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 = -EINVAL;
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}
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return ret;
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}
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