1 files changed, 26 insertions, 0 deletions

diff --git a/drivers/uio/uio.c b/drivers/uio/uio.c
index 5a7ca2e6094d..3a6934bf7131 100644
--- a/drivers/uio/uio.c
+++ b/drivers/uio/uio.c
@@ -427,6 +427,31 @@ static ssize_t uio_read(struct file *filep, char __user *buf,
         return retval;
 }
 
+static ssize_t uio_write(struct file *filep, const char __user *buf,
+                        size_t count, loff_t *ppos)
+{
+        struct uio_listener *listener = filep->private_data;
+        struct uio_device *idev = listener->dev;
+        ssize_t retval;
+        s32 irq_on;
+
+        if (idev->info->irq == UIO_IRQ_NONE)
+                return -EIO;
+
+        if (count != sizeof(s32))
+                return -EINVAL;
+
+        if (!idev->info->irqcontrol)
+                return -ENOSYS;
+
+        if (copy_from_user(&irq_on, buf, count))
+                return -EFAULT;
+
+        retval = idev->info->irqcontrol(idev->info, irq_on);
+
+        return retval ? retval : sizeof(s32);
+}
+
 static int uio_find_mem_index(struct vm_area_struct *vma)
 {
         int mi;
@@ -546,6 +571,7 @@ static const struct file_operations uio_fops = {
         .open           = uio_open,
         .release        = uio_release,
         .read           = uio_read,
+        .write          = uio_write,
         .mmap           = uio_mmap,
         .poll           = uio_poll,
         .fasync         = uio_fasync,