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114 lines
2.4 KiB
C
114 lines
2.4 KiB
C
/* See the end of this file for copyright, license, and warranty information. */
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#include <ardix/atomic.h>
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#include <ardix/device.h>
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#include <ardix/mutex.h>
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#include <ardix/ringbuf.h>
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#include <ardix/sched.h>
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#include <ardix/serial.h>
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#include <arch/serial.h>
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#include <config.h>
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#include <stddef.h>
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static ssize_t serial_device_read(void *dest, struct device *dev, size_t len, off_t offset)
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{
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ssize_t ret;
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struct serial_device *serial_dev = container_of(dev, struct serial_device, device);
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ret = mutex_trylock(&dev->lock);
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if (ret == 0) {
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ret = serial_read(dest, serial_dev, len);
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mutex_unlock(&dev->lock);
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}
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return ret;
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}
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static ssize_t serial_device_write(struct device *dev, const void *src, size_t len, off_t offset)
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{
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ssize_t ret;
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struct serial_device *serial_dev = container_of(dev, struct serial_device, device);
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ret = mutex_trylock(&dev->lock);
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if (ret == 0) {
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ret = serial_write(serial_dev, src, len);
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mutex_unlock(&dev->lock);
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}
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return ret;
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}
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int serial_init(struct serial_device *dev, long int baud)
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{
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int err = -1;
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if (dev->id < 0)
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return -1; /* invalid dev */
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dev->device.read = serial_device_read;
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dev->device.write = serial_device_write;
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err = device_init(&dev->device);
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if (err)
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goto err_device_init;
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dev->baud = baud;
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dev->rx = ringbuf_create(CONFIG_SERIAL_BUFSZ);
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if (dev->rx == NULL)
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goto err_ringbuf_create;
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err = arch_serial_init(dev);
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if (err)
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goto err_arch_serial_init;
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goto out;
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err_arch_serial_init:
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ringbuf_destroy(dev->rx);
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err_ringbuf_create:
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device_put(&dev->device);
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err_device_init:
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out:
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return err;
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}
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void serial_exit(struct serial_device *dev)
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{
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arch_serial_exit(dev);
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ringbuf_destroy(dev->rx);
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dev->id = -1;
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}
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ssize_t serial_read(void *dest, struct serial_device *dev, size_t len)
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{
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ssize_t ret;
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ret = (ssize_t)ringbuf_read(dest, dev->rx, len);
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return ret;
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}
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ssize_t serial_write(struct serial_device *dev, const void *data, size_t len)
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{
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ssize_t ret;
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ret = arch_serial_write(dev, data, len);
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return ret;
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}
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/*
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* This file is part of Ardix.
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* Copyright (c) 2020, 2021 Felix Kopp <owo@fef.moe>.
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*
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* Ardix is non-violent software: you may only use, redistribute,
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* and/or modify it under the terms of the CNPLv6+ as found in
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* the LICENSE file in the source code root directory or at
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* <https://git.pixie.town/thufie/CNPL>.
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*
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* Ardix comes with ABSOLUTELY NO WARRANTY, to the extent
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* permitted by applicable law. See the CNPLv6+ for details.
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*/
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