From: Bastian Stender <bst@pengutronix.de>
To: barebox@lists.infradead.org
Cc: Bastian Stender <bst@pengutronix.de>
Subject: [PATCH 2/4] console: expose consoles in devfs
Date: Fri, 24 Feb 2017 15:24:59 +0100 [thread overview]
Message-ID: <20170224142501.2679-3-bst@pengutronix.de> (raw)
In-Reply-To: <20170224142501.2679-1-bst@pengutronix.de>
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>
---
common/console.c | 52 ++++++++++++++++++++++++++++++++++++++++++++++++++++
include/console.h | 3 +++
2 files changed, 55 insertions(+)
diff --git a/common/console.c b/common/console.c
index 43890b3da8..dcd67afe20 100644
--- a/common/console.c
+++ b/common/console.c
@@ -243,6 +243,39 @@ 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 priv->open(priv);
+}
+
+static int fops_close(struct cdev *dev)
+{
+ struct console_device *priv = dev->priv;
+
+ return priv->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;
@@ -295,6 +328,25 @@ 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 53f6e47fcc..d9fa05c2ce 100644
--- a/include/console.h
+++ b/include/console.h
@@ -59,6 +59,9 @@ 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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next prev parent reply other threads:[~2017-02-24 14:25 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-02-24 14:24 [PATCH 0/4] Prepare consoles, add fb flush and Solomon SSD1307 OLED controller support Bastian Stender
2017-02-24 14:24 ` [PATCH 1/4] console: replace set_active by open/close Bastian Stender
2017-02-27 9:54 ` Sascha Hauer
2017-02-27 15:56 ` [PATCH v2] " Bastian Stender
2017-02-28 7:41 ` Sascha Hauer
2017-02-24 14:24 ` Bastian Stender [this message]
2017-02-27 9:55 ` [PATCH 2/4] console: expose consoles in devfs Sascha Hauer
2017-02-27 16:01 ` [PATCH v2] " Bastian Stender
2017-02-28 7:50 ` Sascha Hauer
2017-02-24 14:25 ` [PATCH 3/4] fb: introduce flush for virtual framebuffer Bastian Stender
2017-02-24 14:25 ` [PATCH 4/4] video: add support for Solomon SSD1307 OLED controller family Bastian Stender
2017-02-24 16:10 ` Bastian Stender
2017-02-27 10:08 ` Sascha Hauer
2017-02-27 15:45 ` Bastian Stender
2017-02-28 7:57 ` Sascha Hauer
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