diff options
| -rw-r--r-- | drivers/usb/gadget/f_fs.c | 42 |
1 files changed, 42 insertions, 0 deletions
diff --git a/drivers/usb/gadget/f_fs.c b/drivers/usb/gadget/f_fs.c index b65a5029dee..20321631f0f 100644 --- a/drivers/usb/gadget/f_fs.c +++ b/drivers/usb/gadget/f_fs.c @@ -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, }; |