1 files changed, 212 insertions, 3 deletions

diff --git a/drivers/usb/serial/opticon.c b/drivers/usb/serial/opticon.c
index cea326f1f105..839583dc8b6a 100644
--- a/drivers/usb/serial/opticon.c
+++ b/drivers/usb/serial/opticon.c
@@ -1,8 +1,8 @@
 /*
  * Opticon USB barcode to serial driver
  *
- * Copyright (C) 2008 Greg Kroah-Hartman <gregkh@suse.de>
- * Copyright (C) 2008 Novell Inc.
+ * Copyright (C) 2008 - 2009 Greg Kroah-Hartman <gregkh@suse.de>
+ * Copyright (C) 2008 - 2009 Novell Inc.
  *
  *      This program is free software; you can redistribute it and/or
  *      modify it under the terms of the GNU General Public License version
@@ -14,6 +14,7 @@
 #include <linux/tty.h>
 #include <linux/tty_driver.h>
 #include <linux/tty_flip.h>
+#include <linux/serial.h>
 #include <linux/module.h>
 #include <linux/usb.h>
 #include <linux/usb/serial.h>
@@ -40,8 +41,12 @@ struct opticon_private {
         bool throttled;
         bool actually_throttled;
         bool rts;
+        int outstanding_urbs;
 };
 
+/* max number of write urbs in flight */
+#define URB_UPPER_LIMIT 4
+
 static void opticon_bulk_callback(struct urb *urb)
 {
         struct opticon_private *priv = urb->context;
@@ -106,7 +111,6 @@ static void opticon_bulk_callback(struct urb *urb)
                                         priv->rts = false;
                                 else
                                         priv->rts = true;
-                                /* FIXME change the RTS level */
                         } else {
                         dev_dbg(&priv->udev->dev,
                                 "Unknown data packet received from the device:"
@@ -188,6 +192,120 @@ static void opticon_close(struct tty_struct *tty, struct usb_serial_port *port,
         usb_kill_urb(priv->bulk_read_urb);
 }
 
+static void opticon_write_bulk_callback(struct urb *urb)
+{
+        struct opticon_private *priv = urb->context;
+        int status = urb->status;
+        unsigned long flags;
+
+        /* free up the transfer buffer, as usb_free_urb() does not do this */
+        kfree(urb->transfer_buffer);
+
+        if (status)
+                dbg("%s - nonzero write bulk status received: %d",
+                    __func__, status);
+
+        spin_lock_irqsave(&priv->lock, flags);
+        --priv->outstanding_urbs;
+        spin_unlock_irqrestore(&priv->lock, flags);
+
+        usb_serial_port_softint(priv->port);
+}
+
+static int opticon_write(struct tty_struct *tty, struct usb_serial_port *port,
+                         const unsigned char *buf, int count)
+{
+        struct opticon_private *priv = usb_get_serial_data(port->serial);
+        struct usb_serial *serial = port->serial;
+        struct urb *urb;
+        unsigned char *buffer;
+        unsigned long flags;
+        int status;
+
+        dbg("%s - port %d", __func__, port->number);
+
+        spin_lock_irqsave(&priv->lock, flags);
+        if (priv->outstanding_urbs > URB_UPPER_LIMIT) {
+                spin_unlock_irqrestore(&priv->lock, flags);
+                dbg("%s - write limit hit\n", __func__);
+                return 0;
+        }
+        priv->outstanding_urbs++;
+        spin_unlock_irqrestore(&priv->lock, flags);
+
+        buffer = kmalloc(count, GFP_ATOMIC);
+        if (!buffer) {
+                dev_err(&port->dev, "out of memory\n");
+                count = -ENOMEM;
+                goto error_no_buffer;
+        }
+
+        urb = usb_alloc_urb(0, GFP_ATOMIC);
+        if (!urb) {
+                dev_err(&port->dev, "no more free urbs\n");
+                count = -ENOMEM;
+                goto error_no_urb;
+        }
+
+        memcpy(buffer, buf, count);
+
+        usb_serial_debug_data(debug, &port->dev, __func__, count, buffer);
+
+        usb_fill_bulk_urb(urb, serial->dev,
+                          usb_sndbulkpipe(serial->dev,
+                                          port->bulk_out_endpointAddress),
+                          buffer, count, opticon_write_bulk_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",
+                                                        __func__, status);
+                count = status;
+                goto error;
+        }
+
+        /* we are done with this urb, so let the host driver
+         * really free it when it is finished with it */
+        usb_free_urb(urb);
+
+        return count;
+error:
+        usb_free_urb(urb);
+error_no_urb:
+        kfree(buffer);
+error_no_buffer:
+        spin_lock_irqsave(&priv->lock, flags);
+        --priv->outstanding_urbs;
+        spin_unlock_irqrestore(&priv->lock, flags);
+        return count;
+}
+
+static int opticon_write_room(struct tty_struct *tty)
+{
+        struct usb_serial_port *port = tty->driver_data;
+        struct opticon_private *priv = usb_get_serial_data(port->serial);
+        unsigned long flags;
+
+        dbg("%s - port %d", __func__, port->number);
+
+        /*
+         * We really can take almost anything the user throws at us
+         * but let's pick a nice big number to tell the tty
+         * layer that we have lots of free space, unless we don't.
+         */
+        spin_lock_irqsave(&priv->lock, flags);
+        if (priv->outstanding_urbs > URB_UPPER_LIMIT * 2 / 3) {
+                spin_unlock_irqrestore(&priv->lock, flags);
+                dbg("%s - write limit hit\n", __func__);
+                return 0;
+        }
+        spin_unlock_irqrestore(&priv->lock, flags);
+
+        return 2048;
+}
+
 static void opticon_throttle(struct tty_struct *tty)
 {
         struct usb_serial_port *port = tty->driver_data;
@@ -223,6 +341,67 @@ static void opticon_unthrottle(struct tty_struct *tty)
                                                         __func__, result);
 }
 
+static int opticon_tiocmget(struct tty_struct *tty, struct file *file)
+{
+        struct usb_serial_port *port = tty->driver_data;
+        struct opticon_private *priv = usb_get_serial_data(port->serial);
+        unsigned long flags;
+        int result = 0;
+
+        dbg("%s - port %d", __func__, port->number);
+
+        spin_lock_irqsave(&priv->lock, flags);
+        if (priv->rts)
+                result = TIOCM_RTS;
+        spin_unlock_irqrestore(&priv->lock, flags);
+
+        dbg("%s - %x", __func__, result);
+        return result;
+}
+
+static int get_serial_info(struct opticon_private *priv,
+                           struct serial_struct __user *serial)
+{
+        struct serial_struct tmp;
+
+        if (!serial)
+                return -EFAULT;
+
+        memset(&tmp, 0x00, sizeof(tmp));
+
+        /* fake emulate a 16550 uart to make userspace code happy */
+        tmp.type                = PORT_16550A;
+        tmp.line                = priv->serial->minor;
+        tmp.port                = 0;
+        tmp.irq                 = 0;
+        tmp.flags               = ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ;
+        tmp.xmit_fifo_size      = 1024;
+        tmp.baud_base           = 9600;
+        tmp.close_delay         = 5*HZ;
+        tmp.closing_wait        = 30*HZ;
+
+        if (copy_to_user(serial, &tmp, sizeof(*serial)))
+                return -EFAULT;
+        return 0;
+}
+
+static int opticon_ioctl(struct tty_struct *tty, struct file *file,
+                         unsigned int cmd, unsigned long arg)
+{
+        struct usb_serial_port *port = tty->driver_data;
+        struct opticon_private *priv = usb_get_serial_data(port->serial);
+
+        dbg("%s - port %d, cmd = 0x%x", __func__, port->number, cmd);
+
+        switch (cmd) {
+        case TIOCGSERIAL:
+                return get_serial_info(priv,
+                                       (struct serial_struct __user *)arg);
+        }
+
+        return -ENOIOCTLCMD;
+}
+
 static int opticon_startup(struct usb_serial *serial)
 {
         struct opticon_private *priv;
@@ -306,11 +485,37 @@ static void opticon_shutdown(struct usb_serial *serial)
         usb_set_serial_data(serial, NULL);
 }
 
+static int opticon_suspend(struct usb_interface *intf, pm_message_t message)
+{
+        struct usb_serial *serial = usb_get_intfdata(intf);
+        struct opticon_private *priv = usb_get_serial_data(serial);
+
+        usb_kill_urb(priv->bulk_read_urb);
+        return 0;
+}
+
+static int opticon_resume(struct usb_interface *intf)
+{
+        struct usb_serial *serial = usb_get_intfdata(intf);
+        struct opticon_private *priv = usb_get_serial_data(serial);
+        struct usb_serial_port *port = serial->port[0];
+        int result;
+
+        mutex_lock(&port->mutex);
+        if (port->port.count)
+                result = usb_submit_urb(priv->bulk_read_urb, GFP_NOIO);
+        else
+                result = 0;
+        mutex_unlock(&port->mutex);
+        return result;
+}
 
 static struct usb_driver opticon_driver = {
         .name =         "opticon",
         .probe =        usb_serial_probe,
         .disconnect =   usb_serial_disconnect,
+        .suspend =      opticon_suspend,
+        .resume =       opticon_resume,
         .id_table =     id_table,
         .no_dynamic_id =        1,
 };
@@ -326,9 +531,13 @@ static struct usb_serial_driver opticon_device = {
         .attach =               opticon_startup,
         .open =                 opticon_open,
         .close =                opticon_close,
+        .write =                opticon_write,
+        .write_room =           opticon_write_room,
         .shutdown =             opticon_shutdown,
         .throttle =             opticon_throttle,
         .unthrottle =           opticon_unthrottle,
+        .ioctl =                opticon_ioctl,
+        .tiocmget =             opticon_tiocmget,
 };
 
 static int __init opticon_init(void)