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path: root/drivers/usb/serial/opticon.c
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Diffstat (limited to 'drivers/usb/serial/opticon.c')
-rw-r--r--drivers/usb/serial/opticon.c215
1 files changed, 212 insertions, 3 deletions
diff --git a/drivers/usb/serial/opticon.c b/drivers/usb/serial/opticon.c
index cea326f..839583d 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)
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