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console: expose consoles in devfs 

This enables displaying text on e.g. a framebuffer console by issueing

	echo -o /dev/fbconsole0 abc123

Signed-off-by: Bastian Stender <bst@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
This commit is contained in:
Bastian Stender 2017-02-28 15:31:25 +01:00 committed by Sascha Hauer
parent 1233570798
commit b4f55fcf35
2 changed files with 56 additions and 0 deletions
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53
common/console.c
View File

@ -272,6 +272,40 @@ static int __console_puts(struct console_device *cdev, const char *s)
return n;
}
static int fops_open(struct cdev *cdev, unsigned long flags)
{
struct console_device *priv = cdev->priv;
return console_open(priv);
}
static int fops_close(struct cdev *dev)
{
struct console_device *priv = dev->priv;
return console_close(priv);
}
static int fops_flush(struct cdev *dev)
{
struct console_device *priv = dev->priv;
if (priv->flush)
priv->flush(priv);
return 0;
}
static int fops_write(struct cdev* dev, const void* buf, size_t count,
loff_t offset, ulong flags)
{
struct console_device *priv = dev->priv;
priv->puts(priv, buf);
return 0;
}
int console_register(struct console_device *newcdev)
{
struct device_d *dev = &newcdev->class_dev;
@ -326,6 +360,25 @@ int console_register(struct console_device *newcdev)
console_set_active(newcdev, CONSOLE_STDIN |
CONSOLE_STDOUT | CONSOLE_STDERR);
/* expose console as device in fs */
newcdev->devfs.name = basprintf("%s%d", newcdev->class_dev.name,
newcdev->class_dev.id);
newcdev->devfs.priv = newcdev;
newcdev->devfs.dev = dev;
newcdev->devfs.ops = &newcdev->fops;
newcdev->devfs.flags = DEVFS_IS_CHARACTER_DEV;
newcdev->fops.open = fops_open;
newcdev->fops.close = fops_close;
newcdev->fops.flush = fops_flush;
newcdev->fops.write = fops_write;
ret = devfs_create(&newcdev->devfs);
if (ret) {
pr_err("device creation failed with %s\n", strerror(-ret));
return ret;
}
return 0;
}
EXPORT_SYMBOL(console_register);

3
include/console.h
View File

@ -61,6 +61,9 @@ struct console_device {
unsigned int baudrate_param;
const char *linux_console_name;
struct cdev devfs;
struct file_operations fops;
};
int console_register(struct console_device *cdev);