toaruos/kernel/fs/serialdev.c

/* Serial device */
#include <system.h>
#include <fs.h>

uint32_t read_serial(fs_node_t *node, uint32_t offset, uint32_t size, uint8_t *buffer);
uint32_t write_serial(fs_node_t *node, uint32_t offset, uint32_t size, uint8_t *buffer);
void open_serial(fs_node_t *node, uint8_t read, uint8_t write);
void close_serial(fs_node_t *node);

uint32_t read_serial(fs_node_t *node, uint32_t offset, uint32_t size, uint8_t *buffer) {
	if (size < 1) {
		return 0;
	}
	memset(buffer, 0x00, 1);
	uint32_t collected = 0;
	while (collected < size) {
		if (serial_rcvd(node->inode) == 0)
			return collected;
		buffer[collected] = serial_recv(node->inode);
		collected++;
	}
	return collected;
}

uint32_t write_serial(fs_node_t *node, uint32_t offset, uint32_t size, uint8_t *buffer) {
	uint32_t sent = 0;
	while (sent < size) {
		serial_send(node->inode, buffer[sent]);
		sent++;
	}
	return size;
}

void open_serial(fs_node_t * node, uint8_t read, uint8_t write) {
	return;
}

void close_serial(fs_node_t * node) {
	return;
}

fs_node_t * serial_device_create(int device) {
	fs_node_t * fnode = malloc(sizeof(fs_node_t));
	fnode->inode = device;
	strcpy(fnode->name, "serial");
	fnode->uid = 0;
	fnode->gid = 0;
	fnode->flags = 0;
	fnode->read    = read_serial;
	fnode->write   = write_serial;
	fnode->open    = open_serial;
	fnode->close   = close_serial;
	fnode->readdir = NULL;
	fnode->finddir = NULL;
	return fnode;
}