/*
* AirPrime CDMA Wireless Serial USB driver
*
* Copyright (C) 2005-2006 Greg Kroah-Hartman <gregkh@suse.de>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License version
* 2 as published by the Free Software Foundation.
*/
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/tty.h>
#include <linux/tty_flip.h>
#include <linux/module.h>
#include <linux/usb.h>
#include <linux/usb/serial.h>
static struct usb_device_id id_table [] = {
{ USB_DEVICE(0x0c88, 0x17da) }, /* Kyocera Wireless KPC650/Passport */
{ USB_DEVICE(0x1410, 0x1110) }, /* Novatel Wireless Merlin CDMA */
{ USB_DEVICE(0x1410, 0x1100) }, /* ExpressCard34 Qualcomm 3G CDMA */
{ },
};
MODULE_DEVICE_TABLE(usb, id_table);
#define URB_TRANSFER_BUFFER_SIZE 4096
#define NUM_READ_URBS 4
#define NUM_WRITE_URBS 4
#define NUM_BULK_EPS 3
#define MAX_BULK_EPS 6
/* if overridden by the user, then use their value for the size of the
* read and write urbs, and the number of endpoints */
static int buffer_size = URB_TRANSFER_BUFFER_SIZE;
static int endpoints = NUM_BULK_EPS;
static int debug;
struct airprime_private {
spinlock_t lock;
int outstanding_urbs;
int throttled;
struct urb *read_urbp[NUM_READ_URBS];
};
static void airprime_read_bulk_callback(struct urb *urb)
{
struct usb_serial_port *port = urb->context;
unsigned char *data = urb->transfer_buffer;
struct tty_struct *tty;
int result;
dbg("%s - port %d", __FUNCTION__, port->number);
if (urb->status) {
dbg("%s - nonzero read bulk status received: %d",
__FUNCTION__, urb->status);
/* something happened, so free up the memory for this urb */
if (urb->transfer_buffer) {
kfree (urb->transfer_buffer);
urb->transfer_buffer = NULL;
}
return;
}
usb_serial_debug_data(debug, &port->dev, __FUNCTION__, urb->actual_length, data);
tty = port->tty;
if (tty && urb->actual_length) {
tty_insert_flip_string (tty, data, urb->actual_length);
tty_flip_buffer_push (tty);
}
result = usb_submit_urb (urb, GFP_ATOMIC);
if (result)
dev_err(&port->dev, "%s - failed resubmitting read urb, error %d\n",
__FUNCTION__, result);
return;
}
static void airprime_write_bulk_callback(struct urb *urb)
{
struct usb_serial_port *port = urb->context;
struct airprime_private *priv = usb_get_serial_port_data(port);
unsigned long flags;
dbg("%s - port %d", __FUNCTION__, port->number);
/* free up the transfer buffer, as usb_free_urb() does not do this */
kfree (urb->transfer_buffer);
if (urb->status)
dbg("%s - nonzero write bulk status received: %d",
__FUNCTION__, urb->status);
spin_lock_irqsave(&priv->lock, flags);
--priv->outstanding_urbs;
spin_unlock_irqrestore(&priv->lock, flags);
usb_serial_port_softint(port);
}
static int airprime_open(struct usb_serial_port *port, struct file *filp)
{
struct airprime_private *priv = usb_get_serial_port_data(port);
struct usb_serial *serial = port->serial;
struct urb *urb;
char *buffer = NULL;
int i;
int result = 0;
dbg("%s - port %d", __FUNCTION__, port->number);
/* initialize our private data structure if it isn't already created */
if (!priv) {
priv = kzalloc(sizeof(*priv), GFP_KERNEL);
if (!priv) {
result = -ENOMEM;
goto out;
}
spin_lock_init(&priv->lock);
usb_set_serial_port_data(port, priv);
}
for (i = 0; i < NUM_READ_URBS; ++i) {
buffer = kmalloc(buffer_size, GFP_KERNEL);
if (!buffer) {
dev_err(&port->dev, "%s - out of memory.\n",
__FUNCTION__);
result = -ENOMEM;
goto errout;
}
urb = usb_alloc_urb(0, GFP_KERNEL);
if (!urb) {
kfree(buffer);
dev_err(&port->dev, "%s - no more urbs?\n",
__FUNCTION__);
result = -ENOMEM;
goto errout;
}
usb_fill_bulk_urb(urb, serial->dev,
usb_rcvbulkpipe(serial->dev,
port->bulk_out_endpointAddress),
buffer, buffer_size,
airprime_read_bulk_callback, port);
result = usb_submit_urb(urb, GFP_KERNEL);
if (result) {
dev_err(&port->dev,
"%s - failed submitting read urb %d for port %d, error %d\n",
__FUNCTION__, i, port->number, result);
goto errout;
}
/* remember this urb so we can kill it when the port is closed */
priv->read_urbp[i] = urb;
}
goto out;
errout:
/* some error happened, cancel any submitted urbs and clean up anything that
got allocated successfully */
for ( ; i >= 0; --i) {
urb = priv->read_urbp[i];
if (urb) {
/* This urb was submitted successfully. So we have to
cancel it.
Unlinking the urb will invoke read_bulk_callback()
with an error status, so its transfer buffer will
be freed there */
if (usb_unlink_urb (urb) != -EINPROGRESS) {
/* comments in drivers/usb/core/urb.c say this
can only happen if the urb was never submitted,
or has completed already.
Either way we may have to free the transfer
buffer here. */
if (urb->transfer_buffer) {
kfree (urb->transfer_buffer);
urb->transfer_buffer = NULL;
}
}
usb_free_urb (urb);
}
}
out:
return result;
}
static void airprime_close(struct usb_serial_port *port, struct file * filp)
{
struct airprime_private *priv = usb_get_serial_port_data(port);
int i;
dbg("%s - port %d", __FUNCTION__, port->number);
/* killing the urb will invoke read_bulk_callback() with an error status,
so the transfer buffer will be freed there */
for (i = 0; i < NUM_READ_URBS; ++i) {
usb_kill_urb (priv->read_urbp[i]);
usb_free_urb (priv->read_urbp[i]);
}
/* free up private structure */
kfree (priv);
usb_set_serial_port_data(port, NULL);
}
static int airprime_write(struct usb_serial_port *port,
const unsigned char *buf, int count)
{
struct airprime_private *priv = usb_get_serial_port_data(port);
struct usb_serial *serial = port->serial;
struct urb *urb;
unsigned char *buffer;
unsigned long flags;
int status;
dbg("%s - port %d", __FUNCTION__, port->number);
spin_lock_irqsave(&priv->lock, flags);
if (priv->outstanding_urbs > NUM_WRITE_URBS) {
spin_unlock_irqrestore(&priv->lock, flags);
dbg("%s - write limit hit\n", __FUNCTION__);
return 0;
}
spin_unlock_irqrestore(&priv->lock, flags);
buffer = kmalloc(count, GFP_ATOMIC);
if (!buffer) {
dev_err(&port->dev, "out of memory\n");
return -ENOMEM;
}
urb = usb_alloc_urb(0, GFP_ATOMIC);
if (!urb) {
dev_err(&port->dev, "no more free urbs\n");
kfree (buffer);
return -ENOMEM;
}
memcpy (buffer, buf, count);
usb_serial_debug_data(debug, &port->dev, __FUNCTION__, count, buffer);
usb_fill_bulk_urb(urb, serial->dev,
usb_sndbulkpipe(serial->dev,
port->bulk_out_endpointAddress),
buffer, count,
airprime_write_bulk_callback, port);
/* 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",
__FUNCTION__, status);
count = status;
kfree (buffer);
} else {
spin_lock_irqsave(&priv->lock, flags);
++priv->outstanding_urbs;
spin_unlock_irqrestore(&priv->lock, flags);
}
/* 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;
}
static struct usb_driver airprime_driver = {
.name = "airprime",
.probe = usb_serial_probe,
.disconnect = usb_serial_disconnect,
.id_table = id_table,
.no_dynamic_id = 1,
};
static struct usb_serial_driver airprime_device = {
.driver = {
.owner = THIS_MODULE,
.name = "airprime",
},
.id_table = id_table,
.num_interrupt_in = NUM_DONT_CARE,
.num_bulk_in = NUM_DONT_CARE,
.num_bulk_out = NUM_DONT_CARE,
.open = airprime_open,
.close = airprime_close,
.write = airprime_write,
};
static int __init airprime_init(void)
{
int retval;
airprime_device.num_ports =
(endpoints > 0 && endpoints <= MAX_BULK_EPS) ? endpoints : NUM_BULK_EPS;
retval = usb_serial_register(&airprime_device);
if (retval)
return retval;
retval = usb_register(&airprime_driver);
if (retval)
usb_serial_deregister(&airprime_device);
return retval;
}
static void __exit airprime_exit(void)
{
dbg("%s", __FUNCTION__);
usb_deregister(&airprime_driver);
usb_serial_deregister(&airprime_device);
}
module_init(airprime_init);
module_exit(airprime_exit);
MODULE_LICENSE("GPL");
module_param(debug, bool, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(debug, "Debug enabled");
module_param(buffer_size, int, 0);
MODULE_PARM_DESC(buffer_size, "Size of the transfer buffers in bytes (default 4096)");
module_param(endpoints, int, 0);
MODULE_PARM_DESC(endpoints, "Number of bulk EPs to configure (default 3)");
