linux-kernel - [PATCH 1/2] uio: add support for ioctls

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Message-Id: <1443652138-31782-2-git-send-email-stephen@networkplumber.org>
Date:	Wed, 30 Sep 2015 15:28:57 -0700
From:	Stephen Hemminger <stephen@...workplumber.org>
To:	hjk@...sjkoch.de, gregkh@...ux-foundation.org
Cc:	linux-kernel@...r.kernel.org, dev@...k.org,
	Stephen Hemminger <stephen@...workplumber.org>
Subject: [PATCH 1/2] uio: add support for ioctls

Allow UIO device driver to provide ioctl interface.
This allow additional API's for UIO.

Signed-off-by: Stephen Hemminger <stephen@...workplumber.org>
---
 drivers/uio/uio.c          | 15 +++++++++++++++
 include/linux/uio_driver.h |  3 +++
 2 files changed, 18 insertions(+)

diff --git a/drivers/uio/uio.c b/drivers/uio/uio.c
index 8196581..5ab32ab 100644
--- a/drivers/uio/uio.c
+++ b/drivers/uio/uio.c
@@ -576,6 +576,20 @@ static ssize_t uio_write(struct file *filep, const char __user *buf,
 	return retval ? retval : sizeof(s32);
 }
 
+static long uio_ioctl(struct file *filep, unsigned int cmd, unsigned long arg)
+{
+	struct uio_listener *listener = filep->private_data;
+	struct uio_device *idev = listener->dev;
+
+	if (!idev->info)
+		return -EIO;
+
+	if (!idev->info->ioctl)
+		return -ENOTTY;
+
+	return idev->info->ioctl(idev->info, cmd, arg);
+}
+
 static int uio_find_mem_index(struct vm_area_struct *vma)
 {
 	struct uio_device *idev = vma->vm_private_data;
@@ -712,6 +726,7 @@ static const struct file_operations uio_fops = {
 	.write		= uio_write,
 	.mmap		= uio_mmap,
 	.poll		= uio_poll,
+	.unlocked_ioctl	= uio_ioctl,
 	.fasync		= uio_fasync,
 	.llseek		= noop_llseek,
 };
diff --git a/include/linux/uio_driver.h b/include/linux/uio_driver.h
index 32c0e83..10d7833 100644
--- a/include/linux/uio_driver.h
+++ b/include/linux/uio_driver.h
@@ -89,6 +89,7 @@ struct uio_device {
  * @mmap:		mmap operation for this uio device
  * @open:		open operation for this uio device
  * @release:		release operation for this uio device
+ * @ioctl:		ioctl handler
  * @irqcontrol:		disable/enable irqs when 0/1 is written to /dev/uioX
  */
 struct uio_info {
@@ -105,6 +106,8 @@ struct uio_info {
 	int (*open)(struct uio_info *info, struct inode *inode);
 	int (*release)(struct uio_info *info, struct inode *inode);
 	int (*irqcontrol)(struct uio_info *info, s32 irq_on);
+	int (*ioctl)(struct uio_info *info, unsigned int cmd,
+		     unsigned long arg);
 };
 
 extern int __must_check
-- 
2.1.4

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