This function is needed by some bluetooth drivers
Signed-off-by: Hauke Mehrtens <hauke@xxxxxxxxxx>
---
compat/compat-2.6.28.c | 128 +++++++++++++++++++++++++++++++++++++++++
include/linux/compat-2.6.28.h | 6 ++
2 files changed, 134 insertions(+), 0 deletions(-)
diff --git a/compat/compat-2.6.28.c b/compat/compat-2.6.28.c
index 115bd23..bfb645a 100644
--- a/compat/compat-2.6.28.c
+++ b/compat/compat-2.6.28.c
@@ -13,6 +13,8 @@
#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,28))
#include <linux/usb.h>
+#include <linux/tty.h>
+#include <asm/poll.h>
/* 2.6.28 compat code goes here */
@@ -370,4 +372,130 @@ void skb_add_rx_frag(struct sk_buff *skb, int i, struct page *page, int off,
}
EXPORT_SYMBOL(skb_add_rx_frag);
+void tty_write_unlock(struct tty_struct *tty)
+{
+ mutex_unlock(&tty->atomic_write_lock);
+ wake_up_interruptible_poll(&tty->write_wait, POLLOUT);
+}
+
+int tty_write_lock(struct tty_struct *tty, int ndelay)
+{
+ if (!mutex_trylock(&tty->atomic_write_lock)) {
+ if (ndelay)
+ return -EAGAIN;
+ if (mutex_lock_interruptible(&tty->atomic_write_lock))
+ return -ERESTARTSYS;
+ }
+ return 0;
+}
+
+/**
+ * send_prio_char - send priority character
+ *
+ * Send a high priority character to the tty even if stopped
+ *
+ * Locking: none for xchar method, write ordering for write method.
+ */
+
+static int send_prio_char(struct tty_struct *tty, char ch)
+{
+ int was_stopped = tty->stopped;
+
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,26))
+ if (tty->ops->send_xchar) {
+ tty->ops->send_xchar(tty, ch);
+#else
+ if (tty->driver->send_xchar) {
+ tty->driver->send_xchar(tty, ch);
+#endif
+ return 0;
+ }
+
+ if (tty_write_lock(tty, 0) < 0)
+ return -ERESTARTSYS;
+
+ if (was_stopped)
+ start_tty(tty);
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,26))
+ tty->ops->write(tty, &ch, 1);
+#else
+ tty->driver->write(tty, &ch, 1);
+#endif
+ if (was_stopped)
+ stop_tty(tty);
+ tty_write_unlock(tty);
+ return 0;
+}
+
+int n_tty_ioctl_helper(struct tty_struct *tty, struct file *file,
+ unsigned int cmd, unsigned long arg)
+{
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,26))
+ unsigned long flags;
+#endif
+ int retval;
+
+ switch (cmd) {
+ case TCXONC:
+ retval = tty_check_change(tty);
+ if (retval)
+ return retval;
+ switch (arg) {
+ case TCOOFF:
+ if (!tty->flow_stopped) {
+ tty->flow_stopped = 1;
+ stop_tty(tty);
+ }
+ break;
+ case TCOON:
+ if (tty->flow_stopped) {
+ tty->flow_stopped = 0;
+ start_tty(tty);
+ }
+ break;
+ case TCIOFF:
+ if (STOP_CHAR(tty) != __DISABLED_CHAR)
+ return send_prio_char(tty, STOP_CHAR(tty));
+ break;
+ case TCION:
+ if (START_CHAR(tty) != __DISABLED_CHAR)
+ return send_prio_char(tty, START_CHAR(tty));
+ break;
+ default:
+ return -EINVAL;
+ }
+ return 0;
+ case TCFLSH:
+ return tty_perform_flush(tty, arg);
+ case TIOCPKT:
+ {
+ int pktmode;
+
+ if (tty->driver->type != TTY_DRIVER_TYPE_PTY ||
+ tty->driver->subtype != PTY_TYPE_MASTER)
+ return -ENOTTY;
+ if (get_user(pktmode, (int __user *) arg))
+ return -EFAULT;
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,26))
+ spin_lock_irqsave(&tty->ctrl_lock, flags);
+#endif
+ if (pktmode) {
+ if (!tty->packet) {
+ tty->packet = 1;
+ tty->link->ctrl_status = 0;
+ }
+ } else
+ tty->packet = 0;
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,26))
+ spin_unlock_irqrestore(&tty->ctrl_lock, flags);
+#endif
+ return 0;
+ }
+ default:
+ /* Try the mode commands */
+ return tty_mode_ioctl(tty, file, cmd, arg);
+ }
+}
+EXPORT_SYMBOL(n_tty_ioctl_helper);
+
#endif /* LINUX_VERSION_CODE < KERNEL_VERSION(2,6,28) */
diff --git a/include/linux/compat-2.6.28.h b/include/linux/compat-2.6.28.h
index 7160548..649fbbc 100644
--- a/include/linux/compat-2.6.28.h
+++ b/include/linux/compat-2.6.28.h
@@ -230,6 +230,12 @@ unsigned long round_jiffies_up(unsigned long j);
extern void skb_add_rx_frag(struct sk_buff *skb, int i, struct page *page,
int off, int size);
+#define wake_up_interruptible_poll(x, m) \
+ __wake_up(x, TASK_INTERRUPTIBLE, 1, (void *) (m))
+
+extern int n_tty_ioctl_helper(struct tty_struct *tty, struct file *file,
+ unsigned int cmd, unsigned long arg);
+
#endif /* (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,28)) */
#endif /* LINUX_26_28_COMPAT_H */
--
1.7.0.4
--
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