ChangeSet 1.1504.2.4, 2003/12/05 10:58:30-08:00, [EMAIL PROTECTED]
[PATCH] USB: add TIOCMIWAIT support to pl2303 driver
drivers/usb/serial/pl2303.c | 43 +++++++++++++++++++++++++++++++++++++++++++
1 files changed, 43 insertions(+)
diff -Nru a/drivers/usb/serial/pl2303.c b/drivers/usb/serial/pl2303.c
--- a/drivers/usb/serial/pl2303.c Mon Dec 29 14:26:47 2003
+++ b/drivers/usb/serial/pl2303.c Mon Dec 29 14:26:47 2003
@@ -169,6 +169,7 @@
struct pl2303_private {
spinlock_t lock;
+ wait_queue_head_t delta_msr_wait;
u8 line_control;
u8 line_status;
u8 termios_initialized;
@@ -186,6 +187,7 @@
return -ENOMEM;
memset (priv, 0x00, sizeof (struct pl2303_private));
spin_lock_init(&priv->lock);
+ init_waitqueue_head(&priv->delta_msr_wait);
usb_set_serial_port_data(serial->port[i], priv);
}
return 0;
@@ -556,11 +558,51 @@
return result;
}
+static int wait_modem_info(struct usb_serial_port *port, unsigned int arg)
+{
+ struct pl2303_private *priv = usb_get_serial_port_data(port);
+ unsigned long flags;
+ unsigned int prevstatus;
+ unsigned int status;
+ unsigned int changed;
+
+ spin_lock_irqsave (&priv->lock, flags);
+ prevstatus = priv->line_status;
+ spin_unlock_irqrestore (&priv->lock, flags);
+
+ while (1) {
+ interruptible_sleep_on(&priv->delta_msr_wait);
+ /* see if a signal did it */
+ if (signal_pending(current))
+ return -ERESTARTSYS;
+
+ spin_lock_irqsave (&priv->lock, flags);
+ status = priv->line_status;
+ spin_unlock_irqrestore (&priv->lock, flags);
+
+ changed=prevstatus^status;
+
+ if (((arg & TIOCM_RNG) && (changed & UART_RING)) ||
+ ((arg & TIOCM_DSR) && (changed & UART_DSR)) ||
+ ((arg & TIOCM_CD) && (changed & UART_DCD)) ||
+ ((arg & TIOCM_CTS) && (changed & UART_CTS)) ) {
+ return 0;
+ }
+ prevstatus = status;
+ }
+ /* NOTREACHED */
+ return 0;
+}
+
static int pl2303_ioctl (struct usb_serial_port *port, struct file *file, unsigned
int cmd, unsigned long arg)
{
dbg("%s (%d) cmd = 0x%04x", __FUNCTION__, port->number, cmd);
switch (cmd) {
+ case TIOCMIWAIT:
+ dbg("%s (%d) TIOCMIWAIT", __FUNCTION__, port->number);
+ return wait_modem_info(port, arg);
+
default:
dbg("%s not supported = 0x%04x", __FUNCTION__, cmd);
break;
@@ -703,6 +745,7 @@
spin_lock_irqsave(&priv->lock, flags);
status = priv->line_status;
spin_unlock_irqrestore(&priv->lock, flags);
+ wake_up_interruptible (&priv->delta_msr_wait);
/* break takes precedence over parity, */
/* which takes precedence over framing errors */
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