[PATCH v2] console: expose consoles in devfs

[Bastian Stender]

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

        echo -o /dev/fbconsole0 abc123

Signed-off-by: Bastian Stender <b...@pengutronix.de>
---
 common/console.c  | 52 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 include/console.h |  3 +++
 2 files changed, 55 insertions(+)

diff --git a/common/console.c b/common/console.c
index 3ff32b8327..bde4c08414 100644
--- a/common/console.c
+++ b/common/console.c
@@ -259,6 +259,39 @@ 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;
+
+       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;
@@ -311,6 +344,25 @@ 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);
diff --git a/include/console.h b/include/console.h
index 85e15cad67..68edc3aaf1 100644
--- a/include/console.h
+++ b/include/console.h
@@ -63,6 +63,9 @@ 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);
-- 
2.11.0


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