From: Martin Jansen <martin.jansen@xxxxxxxxxxx>
Add support for RTS and CTS line status
Signed-off-by: Martin Jansen <martin.jansen@xxxxxxxxxxx>
---
--- linux-2.6.37.1/drivers/usb/serial/opticon.c.orig 2011-02-24
04:24:09.678554999 -0800
+++ linux-2.6.37.1/drivers/usb/serial/opticon.c 2011-02-24
05:35:13.859088028 -0800
@@ -1,6 +1,7 @@
/*
* Opticon USB barcode to serial driver
*
+ * Copyright (C) 2011 Martin Jansen <martin.jansen@xxxxxxxxxxx>
* Copyright (C) 2008 - 2009 Greg Kroah-Hartman <gregkh@xxxxxxx>
* Copyright (C) 2008 - 2009 Novell Inc.
*
@@ -21,6 +22,16 @@
#include <linux/usb/serial.h>
#include <linux/uaccess.h>
+#define CONTROL_RTS 0x02
+#define RESEND_CTS_STATE 0x03
+
+/* max number of write urbs in flight */
+#define URB_UPPER_LIMIT 8
+
+/* This driver works for the Opticon 1D barcode reader
+ * an examples of 1D barcode types are EAN, UPC, Code39, IATA etc.. */
+#define DRIVER_DESC "Opticon USB barcode to serial driver (1D)"
+
static int debug;
static const struct usb_device_id id_table[] = {
@@ -42,13 +53,13 @@ struct opticon_private {
bool throttled;
bool actually_throttled;
bool rts;
+ bool cts;
int outstanding_urbs;
};
-/* max number of write urbs in flight */
-#define URB_UPPER_LIMIT 4
-static void opticon_bulk_callback(struct urb *urb)
+
+static void opticon_read_bulk_callback(struct urb *urb)
{
struct opticon_private *priv = urb->context;
unsigned char *data = urb->transfer_buffer;
@@ -57,6 +68,7 @@ static void opticon_bulk_callback(struct
struct tty_struct *tty;
int result;
int data_length;
+ unsigned long flags;
dbg("%s - port %d", __func__, port->number);
@@ -87,10 +99,10 @@ static void opticon_bulk_callback(struct
* Data from the device comes with a 2 byte header:
*
* <0x00><0x00>data...
- * This is real data to be sent to the tty layer
+ * This is real data to be sent to the tty layer
* <0x00><0x01)level
- * This is a RTS level change, the third byte is the RTS
- * value (0 for low, 1 for high).
+ * This is a CTS level change, the third byte is the CTS
+ * value (0 for low, 1 for high).
*/
if ((data[0] == 0x00) && (data[1] == 0x00)) {
/* real data, send it to the tty layer */
@@ -103,10 +115,13 @@ static void opticon_bulk_callback(struct
}
} else {
if ((data[0] == 0x00) && (data[1] == 0x01)) {
+ spin_lock_irqsave(&priv->lock, flags);
+ /* CTS status infomation package */
if (data[2] == 0x00)
- priv->rts = false;
+ priv->cts = false;
else
- priv->rts = true;
+ priv->cts = true;
+ spin_unlock_irqrestore(&priv->lock, flags);
} else {
dev_dbg(&priv->udev->dev,
"Unknown data packet received from the device:"
@@ -129,7 +144,7 @@ exit:
usb_rcvbulkpipe(priv->udev,
priv->bulk_address),
priv->bulk_in_buffer, priv->buffer_size,
- opticon_bulk_callback, priv);
+ opticon_read_bulk_callback, priv);
result = usb_submit_urb(priv->bulk_read_urb, GFP_ATOMIC);
if (result)
dev_err(&port->dev,
@@ -140,6 +155,24 @@ exit:
spin_unlock(&priv->lock);
}
+static int send_control_msg(struct usb_serial_port *port, u8 requesttype,
+ u8 val)
+{
+ struct usb_serial *serial = port->serial;
+ int retval;
+ u8 buffer[2];
+
+ buffer[0] = val;
+ /* Send the message to the vendor control endpoint
+ * of the connected device */
+ retval = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
+ requesttype,
+ USB_DIR_OUT|USB_TYPE_VENDOR|USB_RECIP_INTERFACE,
+ 0, 0, buffer, 1, 0);
+
+ return retval;
+}
+
static int opticon_open(struct tty_struct *tty, struct usb_serial_port
*port)
{
struct opticon_private *priv = usb_get_serial_data(port->serial);
@@ -152,19 +185,30 @@ static int opticon_open(struct tty_struc
priv->throttled = false;
priv->actually_throttled = false;
priv->port = port;
+ priv->rts = false;
spin_unlock_irqrestore(&priv->lock, flags);
- /* Start reading from the device */
+ /* Clear RTS line */
+ send_control_msg(port, CONTROL_RTS, 0);
+
+ /* Setup the read URB and start reading from the device */
usb_fill_bulk_urb(priv->bulk_read_urb, priv->udev,
usb_rcvbulkpipe(priv->udev,
priv->bulk_address),
priv->bulk_in_buffer, priv->buffer_size,
- opticon_bulk_callback, priv);
+ opticon_read_bulk_callback, priv);
+
+ /* clear the halt status of the enpoint */
+ usb_clear_halt(priv->udev, priv->bulk_read_urb->pipe);
+
result = usb_submit_urb(priv->bulk_read_urb, GFP_KERNEL);
if (result)
dev_err(&port->dev,
"%s - failed resubmitting read urb, error %d\n",
__func__, result);
+ /* Request CTS line state, sometimes during opening the current
+ * CTS state can be missed. */
+ send_control_msg(port, RESEND_CTS_STATE, 1);
return result;
}
@@ -178,7 +222,7 @@ static void opticon_close(struct usb_ser
usb_kill_urb(priv->bulk_read_urb);
}
-static void opticon_write_bulk_callback(struct urb *urb)
+static void opticon_write_control_callback(struct urb *urb)
{
struct opticon_private *priv = urb->context;
int status = urb->status;
@@ -210,6 +254,7 @@ static int opticon_write(struct tty_stru
unsigned char *buffer;
unsigned long flags;
int status;
+ struct usb_ctrlrequest *dr;
dbg("%s - port %d", __func__, port->number);
@@ -226,6 +271,7 @@ static int opticon_write(struct tty_stru
if (!buffer) {
dev_err(&port->dev, "out of memory\n");
count = -ENOMEM;
+
goto error_no_buffer;
}
@@ -240,35 +286,28 @@ static int opticon_write(struct tty_stru
usb_serial_debug_data(debug, &port->dev, __func__, count, buffer);
- if (port->bulk_out_endpointAddress) {
- usb_fill_bulk_urb(urb, serial->dev,
- usb_sndbulkpipe(serial->dev,
- port->bulk_out_endpointAddress),
- buffer, count, opticon_write_bulk_callback, priv);
- } else {
- struct usb_ctrlrequest *dr;
+ /* The conncected devices do not have a bulk write endpoint,
+ * to transmit data to de barcode device the control endpoint is used */
+ dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_NOIO);
+ if (!dr)
+ return -ENOMEM;
- dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_NOIO);
- if (!dr)
- return -ENOMEM;
-
- dr->bRequestType = USB_TYPE_VENDOR | USB_RECIP_INTERFACE | USB_DIR_OUT;
- dr->bRequest = 0x01;
- dr->wValue = 0;
- dr->wIndex = 0;
- dr->wLength = cpu_to_le16(count);
-
- usb_fill_control_urb(urb, serial->dev,
- usb_sndctrlpipe(serial->dev, 0),
- (unsigned char *)dr, buffer, count,
- opticon_write_bulk_callback, priv);
- }
+ dr->bRequestType = USB_TYPE_VENDOR | USB_RECIP_INTERFACE | USB_DIR_OUT;
+ dr->bRequest = 0x01;
+ dr->wValue = 0;
+ dr->wIndex = 0;
+ dr->wLength = cpu_to_le16(count);
+
+ usb_fill_control_urb(urb, serial->dev,
+ usb_sndctrlpipe(serial->dev, 0),
+ (unsigned char *)dr, buffer, count,
+ opticon_write_control_callback, priv);
/* send it down the pipe */
status = usb_submit_urb(urb, GFP_ATOMIC);
if (status) {
dev_err(&port->dev,
- "%s - usb_submit_urb(write bulk) failed with status = %d\n",
+ "%s - usb_submit_urb(write endpoint) failed status = %d\n",
__func__, status);
count = status;
goto error;
@@ -360,16 +399,49 @@ static int opticon_tiocmget(struct tty_s
int result = 0;
dbg("%s - port %d", __func__, port->number);
+ if (!usb_get_intfdata(port->serial->interface))
+ return -ENODEV;
spin_lock_irqsave(&priv->lock, flags);
if (priv->rts)
- result = TIOCM_RTS;
+ result |= TIOCM_RTS;
+ if (priv->cts)
+ result |= TIOCM_CTS;
spin_unlock_irqrestore(&priv->lock, flags);
dbg("%s - %x", __func__, result);
return result;
}
+static int opticon_tiocmset(struct tty_struct *tty, struct file *file,
+ unsigned int set, unsigned int clear)
+{
+ struct usb_serial_port *port = tty->driver_data;
+ struct opticon_private *priv = usb_get_serial_data(port->serial);
+ unsigned long flags;
+ bool rts;
+ bool changed = false;
+
+ if (!usb_get_intfdata(port->serial->interface))
+ return -ENODEV;
+ /* We only support RTS so we only handle that */
+ spin_lock_irqsave(&priv->lock, flags);
+
+ rts = priv->rts;
+ if (set & TIOCM_RTS)
+ priv->rts = true;
+ if (clear & TIOCM_RTS)
+ priv->rts = false;
+ changed = rts ^ priv->rts;
+ spin_unlock_irqrestore(&priv->lock, flags);
+
+ if (!changed)
+ return 0;
+
+ /* Send the new RTS state to the connected device */
+ return send_control_msg(port, CONTROL_RTS, !rts);
+}
+
static int get_serial_info(struct opticon_private *priv,
struct serial_struct __user *serial)
{
@@ -431,6 +503,7 @@ static int opticon_startup(struct usb_se
priv->serial = serial;
priv->port = serial->port[0];
priv->udev = serial->dev;
+ priv->outstanding_urbs = 0; /* Init the outstanding urbs */
/* find our bulk endpoint */
intf = serial->interface->altsetting;
@@ -456,13 +529,6 @@ static int opticon_startup(struct usb_se
priv->bulk_address = endpoint->bEndpointAddress;
- /* set up our bulk urb */
- usb_fill_bulk_urb(priv->bulk_read_urb, priv->udev,
- usb_rcvbulkpipe(priv->udev,
- endpoint->bEndpointAddress),
- priv->bulk_in_buffer, priv->buffer_size,
- opticon_bulk_callback, priv);
-
bulk_in_found = true;
break;
}
@@ -558,6 +624,7 @@ static struct usb_serial_driver opticon_
.unthrottle = opticon_unthrottle,
.ioctl = opticon_ioctl,
.tiocmget = opticon_tiocmget,
+ .tiocmset = opticon_tiocmset,
};
static int __init opticon_init(void)
@@ -581,6 +648,7 @@ static void __exit opticon_exit(void)
module_init(opticon_init);
module_exit(opticon_exit);
+MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL");
module_param(debug, bool, S_IRUGO | S_IWUSR);
--
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