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Subject[PATCH v2 1/3] uio: add ioctl support
Date
Signed-off-by: Vlad Zolotarov <vladz@cloudius-systems.com>
---
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..714b0e5 100644
--- a/drivers/uio/uio.c
+++ b/drivers/uio/uio.c
@@ -704,6 +704,20 @@ static int uio_mmap(struct file *filep, struct vm_area_struct *vma)
}
}

+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 const struct file_operations uio_fops = {
.owner = THIS_MODULE,
.open = uio_open,
@@ -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
--
2.1.0


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