125 lines
2.3 KiB
C
125 lines
2.3 KiB
C
#include <common.h>
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#include <driver.h>
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#include <init.h>
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#include <malloc.h>
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#include <fs.h>
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#include <command.h>
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#include <errno.h>
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#include <linux/stat.h>
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static int devfs_read(struct device_d *_dev, FILE *f, void *buf, size_t size)
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{
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struct device_d *dev = f->inode;
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return dev->driver->read(dev, buf, size, f->pos, f->flags);
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}
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static int devfs_write(struct device_d *_dev, FILE *f, const void *buf, size_t size)
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{
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struct device_d *dev = f->inode;
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return dev->driver->write(dev, buf, size, f->pos, f->flags);
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}
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static int devfs_open(struct device_d *_dev, FILE *file, const char *filename)
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{
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struct device_d *dev = get_device_by_id(filename + 1);
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if (!dev)
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return -ENOENT;
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file->size = dev->size;
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file->inode = dev;
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return 0;
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}
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static int devfs_close(struct device_d *dev, FILE *f)
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{
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return 0;
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}
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struct dir* devfs_opendir(struct device_d *dev, const char *pathname)
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{
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struct dir *dir;
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dir = malloc(sizeof(struct dir));
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if (!dir)
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return NULL;
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dir->priv = get_first_device();
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return dir;
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}
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struct dirent* devfs_readdir(struct device_d *_dev, struct dir *dir)
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{
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struct device_d *dev = dir->priv;
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while (dev && (!strlen(dev->id) || !dev->driver))
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dev = dev->next;
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if (dev) {
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strcpy(dir->d.name, dev->id);
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dir->priv = dev->next;
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return &dir->d;
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}
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return NULL;
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}
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int devfs_closedir(struct device_d *dev, struct dir *dir)
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{
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free(dir);
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return 0;
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}
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int devfs_stat(struct device_d *_dev, const char *filename, struct stat *s)
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{
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struct device_d *dev;
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dev = get_device_by_id(filename + 1);
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if (!dev)
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return -ENOENT;
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if (!dev->driver)
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return -ENXIO;
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s->st_mode = S_IFCHR;
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s->st_size = dev->size;
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if (dev->driver->write)
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s->st_mode |= S_IWUSR;
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if (dev->driver->read)
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s->st_mode |= S_IRUSR;
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return 0;
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}
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int devfs_probe(struct device_d *dev)
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{
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return 0;
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}
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static struct fs_driver_d devfs_driver = {
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.type = FS_TYPE_DEVFS,
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.read = devfs_read,
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.write = devfs_write,
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.open = devfs_open,
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.close = devfs_close,
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.opendir = devfs_opendir,
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.readdir = devfs_readdir,
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.closedir = devfs_closedir,
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.stat = devfs_stat,
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.flags = FS_DRIVER_NO_DEV,
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.drv = {
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.type = DEVICE_TYPE_FS,
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.probe = devfs_probe,
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.name = "devfs",
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.type_data = &devfs_driver,
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}
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};
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int devfs_init(void)
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{
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return register_driver(&devfs_driver.drv);
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}
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device_initcall(devfs_init);
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