usb: gadget: f_fs: add poll for endpoint 0 (23de91e9) · Commits · 戴 / test

drivers/usb/gadget/f_fs.c

+42 −0

Original line number	Diff line number	Diff line
		@@ -28,6 +28,8 @@
		#include <linux/usb/composite.h>
		#include <linux/usb/functionfs.h>

		#include <linux/poll.h>

		#include "u_fs.h"
		#include "configfs.h"

		@@ -570,6 +572,45 @@ static long ffs_ep0_ioctl(struct file *file, unsigned code, unsigned long value)
		return ret;
		}

		static unsigned int ffs_ep0_poll(struct file file, poll_table wait)
		{
		struct ffs_data *ffs = file->private_data;
		unsigned int mask = POLLWRNORM;
		int ret;

		poll_wait(file, &ffs->ev.waitq, wait);

		ret = ffs_mutex_lock(&ffs->mutex, file->f_flags & O_NONBLOCK);
		if (unlikely(ret < 0))
		return mask;

		switch (ffs->state) {
		case FFS_READ_DESCRIPTORS:
		case FFS_READ_STRINGS:
		mask \|= POLLOUT;
		break;

		case FFS_ACTIVE:
		switch (ffs->setup_state) {
		case FFS_NO_SETUP:
		if (ffs->ev.count)
		mask \|= POLLIN;
		break;

		case FFS_SETUP_PENDING:
		case FFS_SETUP_CANCELLED:
		mask \|= (POLLIN \| POLLOUT);
		break;
		}
		case FFS_CLOSING:
		break;
		}

		mutex_unlock(&ffs->mutex);

		return mask;
		}

		static const struct file_operations ffs_ep0_operations = {
		.llseek = no_llseek,

		@@ -578,6 +619,7 @@ static const struct file_operations ffs_ep0_operations = {
		.read = ffs_ep0_read,
		.release = ffs_ep0_release,
		.unlocked_ioctl = ffs_ep0_ioctl,
		.poll = ffs_ep0_poll,
		};