USB: add poll to gadgetfs's endpoint zero
Add poll() support to gadgetfs ep0 Signed-off-by: Milan Svoboda <msvoboda@ra.rockwell.com> Signed-off-by: David Brownell <dbrownell@users.sourceforge.net> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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@ -32,6 +32,7 @@
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#include <linux/compiler.h>
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#include <asm/uaccess.h>
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#include <linux/slab.h>
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#include <linux/poll.h>
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#include <linux/device.h>
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#include <linux/moduleparam.h>
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@ -1235,6 +1236,35 @@ dev_release (struct inode *inode, struct file *fd)
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return 0;
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}
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static unsigned int
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ep0_poll (struct file *fd, poll_table *wait)
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{
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struct dev_data *dev = fd->private_data;
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int mask = 0;
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poll_wait(fd, &dev->wait, wait);
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spin_lock_irq (&dev->lock);
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/* report fd mode change before acting on it */
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if (dev->setup_abort) {
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dev->setup_abort = 0;
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mask = POLLHUP;
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goto out;
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}
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if (dev->state == STATE_SETUP) {
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if (dev->setup_in || dev->setup_can_stall)
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mask = POLLOUT;
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} else {
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if (dev->ev_next != 0)
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mask = POLLIN;
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}
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out:
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spin_unlock_irq(&dev->lock);
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return mask;
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}
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static int dev_ioctl (struct inode *inode, struct file *fd,
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unsigned code, unsigned long value)
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{
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@ -1254,7 +1284,7 @@ static const struct file_operations ep0_io_operations = {
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.read = ep0_read,
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.write = ep0_write,
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.fasync = ep0_fasync,
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// .poll = ep0_poll,
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.poll = ep0_poll,
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.ioctl = dev_ioctl,
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.release = dev_release,
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};
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