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video: pxa3xx-gcu: provide an empty .open call

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This is necessary in order to make the core set file->private_data to
miscdev in use. We need that information later to dereference the
container of the device, so we can get access to our private struct from
other callbacks.

Signed-off-by: Daniel Mack <zonque@gmail.com>
Acked-by: Haojian Zhuang <haojian.zhuang@gmail.com>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
This commit is contained in:
Daniel Mack 2014-03-05 17:12:48 +01:00 committed by Tomi Valkeinen
parent 9e4f9675be
commit 3437b2b83f
1 changed files with 10 additions and 0 deletions
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10
drivers/video/pxa3xx-gcu.c
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@ -373,6 +373,15 @@ static inline struct pxa3xx_gcu_priv *to_pxa3xx_gcu_priv(struct file *file)
return container_of(dev, struct pxa3xx_gcu_priv, misc_dev);
}
/*
* provide an empty .open callback, so the core sets file->private_data
* for us.
*/
static int pxa3xx_gcu_open(struct inode *inode, struct file *file)
{
return 0;
}
static ssize_t
pxa3xx_gcu_write(struct file *file, const char *buff,
size_t count, loff_t *offp)
@ -571,6 +580,7 @@ pxa3xx_gcu_free_buffers(struct device *dev,
static const struct file_operations pxa3xx_gcu_miscdev_fops = {
.owner = THIS_MODULE,
.open = pxa3xx_gcu_open,
.write = pxa3xx_gcu_write,
.unlocked_ioctl = pxa3xx_gcu_ioctl,
.mmap = pxa3xx_gcu_mmap,