HID: uhid: implement write() on uhid devices
Similar to read() you can only write() a single event with one call to an uhid device. To write multiple events use writev() which is supported by uhid. We currently always return -EOPNOTSUPP but other events will be added in later patches. Signed-off-by: David Herrmann <dh.herrmann@googlemail.com> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
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@ -30,6 +30,7 @@
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struct uhid_device {
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struct uhid_device {
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struct mutex devlock;
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struct mutex devlock;
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struct hid_device *hid;
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struct hid_device *hid;
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struct uhid_event input_buf;
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wait_queue_head_t waitq;
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wait_queue_head_t waitq;
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spinlock_t qlock;
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spinlock_t qlock;
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@ -156,7 +157,35 @@ try_again:
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static ssize_t uhid_char_write(struct file *file, const char __user *buffer,
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static ssize_t uhid_char_write(struct file *file, const char __user *buffer,
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size_t count, loff_t *ppos)
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size_t count, loff_t *ppos)
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{
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{
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return 0;
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struct uhid_device *uhid = file->private_data;
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int ret;
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size_t len;
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/* we need at least the "type" member of uhid_event */
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if (count < sizeof(__u32))
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return -EINVAL;
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ret = mutex_lock_interruptible(&uhid->devlock);
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if (ret)
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return ret;
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memset(&uhid->input_buf, 0, sizeof(uhid->input_buf));
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len = min(count, sizeof(uhid->input_buf));
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if (copy_from_user(&uhid->input_buf, buffer, len)) {
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ret = -EFAULT;
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goto unlock;
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}
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switch (uhid->input_buf.type) {
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default:
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ret = -EOPNOTSUPP;
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}
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unlock:
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mutex_unlock(&uhid->devlock);
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/* return "count" not "len" to not confuse the caller */
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return ret ? ret : count;
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}
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}
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static unsigned int uhid_char_poll(struct file *file, poll_table *wait)
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static unsigned int uhid_char_poll(struct file *file, poll_table *wait)
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