/*
Option Card (PCMCIA to) USB to Serial Driver
Copyright (C) 2005 Matthias Urlichs <smurf@smurf.noris.de>
This driver is free software; you can redistribute it and/or modify
it under the terms of Version 2 of the GNU General Public License as
published by the Free Software Foundation.
Portions copied from the Keyspan driver by Hugh Blemings <hugh@blemings.org>
History:
2005-05-19 v0.1 Initial version, based on incomplete docs
and analysis of misbehavior of the standard driver
2005-05-20 v0.2 Extended the input buffer to avoid losing
random 64-byte chunks of data
2005-05-21 v0.3 implemented chars_in_buffer()
turned on low_latency
simplified the code somewhat
*/
#define DRIVER_VERSION "v0.3"
#define DRIVER_AUTHOR "Matthias Urlichs <smurf@smurf.noris.de>"
#define DRIVER_DESC "Option Card (PC-Card to) USB to Serial Driver"
#include <linux/config.h>
#include <linux/kernel.h>
#include <linux/jiffies.h>
#include <linux/errno.h>
#include <linux/tty.h>
#include <linux/tty_flip.h>
#include <linux/module.h>
#include <linux/usb.h>
#include "usb-serial.h"
/* Function prototypes */
static int option_open (struct usb_serial_port *port, struct file *filp);
static void option_close (struct usb_serial_port *port, struct file *filp);
static int option_startup (struct usb_serial *serial);
static void option_shutdown (struct usb_serial *serial);
static void option_rx_throttle (struct usb_serial_port *port);
static void option_rx_unthrottle (struct usb_serial_port *port);
static int option_write_room (struct usb_serial_port *port);
static void option_instat_callback(struct urb *urb, struct pt_regs *regs);
static int option_write (struct usb_serial_port *port,
const unsigned char *buf, int count);
static int option_chars_in_buffer (struct usb_serial_port *port);
static int option_ioctl (struct usb_serial_port *port, struct file *file,
unsigned int cmd, unsigned long arg);
static void option_set_termios (struct usb_serial_port *port,
struct termios *old);
static void option_break_ctl (struct usb_serial_port *port, int break_state);
static int option_tiocmget (struct usb_serial_port *port, struct file *file);
static int option_tiocmset (struct usb_serial_port *port, struct file *file,
unsigned int set, unsigned int clear);
static int option_send_setup (struct usb_serial_port *port);
/* Vendor and product IDs */
#define OPTION_VENDOR_ID 0x0AF0
#define OPTION_PRODUCT_OLD 0x5000
#define OPTION_PRODUCT_WLAN 0x6000
static struct usb_device_id option_ids[] = {
{ USB_DEVICE(OPTION_VENDOR_ID, OPTION_PRODUCT_OLD) },
{ USB_DEVICE(OPTION_VENDOR_ID, OPTION_PRODUCT_WLAN) },
{ } /* Terminating entry */
};
MODULE_DEVICE_TABLE(usb, option_ids);
static struct usb_driver option_driver = {
.owner = THIS_MODULE,
.name = "option",
.probe = usb_serial_probe,
.disconnect = usb_serial_disconnect,
.id_table = option_ids,
};
/* The card has three separate interfaces, wich the serial driver
* recognizes separately, thus num_port=1.
*/
static struct usb_serial_device_type option_3port_device = {
.owner = THIS_MODULE,
.name = "Option 3-port card",
.short_name = "option",
.id_table = option_ids,
.num_interrupt_in = NUM_DONT_CARE,
.num_bulk_in = NUM_DONT_CARE,
.num_bulk_out = NUM_DONT_CARE,
.num_ports = 1, /* 3 */
.open = option_open,
.close = option_close,
.write = option_write,
.write_room = option_write_room,
.chars_in_buffer = option_chars_in_buffer,
.throttle = option_rx_throttle,
.unthrottle = option_rx_unthrottle,
.ioctl = option_ioctl,
.set_termios = option_set_termios,
.break_ctl = option_break_ctl,
.tiocmget = option_tiocmget,
.tiocmset = option_tiocmset,
.attach = option_startup,
.shutdown = option_shutdown,
.read_int_callback = option_instat_callback,
};
static int debug;
/* per port private data */
#define N_IN_URB 4
#define N_OUT_URB 1
#define IN_BUFLEN 1024
#define OUT_BUFLEN 1024
struct option_port_private {
/* Input endpoints and buffer for this port */
struct urb *in_urbs[N_IN_URB];
char in_buffer[N_IN_URB][IN_BUFLEN];
/* Output endpoints and buffer for this port */
struct urb *out_urbs[N_OUT_URB];
char out_buffer[N_OUT_URB][OUT_BUFLEN];
/* Settings for the port */
int rts_state; /* Handshaking pins (outputs) */
int dtr_state;
int cts_state; /* Handshaking pins (inputs) */
int dsr_state;
int dcd_state;
int ri_state;
// int break_on;
unsigned long tx_start_time[N_OUT_URB];
};
/* Functions used by new usb-serial code. */
static int __init
option_init (void)
{
int retval;
retval = usb_serial_register(&option_3port_device);
if (retval)
goto failed_3port_device_register;
retval = usb_register(&option_driver);
if (retval)
goto failed_driver_register;
info(DRIVER_DESC ": " DRIVER_VERSION);
return 0;
failed_driver_register:
usb_serial_deregister (&option_3port_device);
failed_3port_device_register:
return retval;
}
static void __exit
option_exit (void)
{
usb_deregister (&option_driver);
usb_serial_deregister (&option_3port_device);
}
module_init(option_init);
module_exit(option_exit);
static void
option_rx_throttle (struct usb_serial_port *port)
{
dbg("%s", __FUNCTION__);
}
static void
option_rx_unthrottle (struct usb_serial_port *port)
{
dbg("%s", __FUNCTION__);
}
static void
option_break_ctl (struct usb_serial_port *port, int break_state)
{
/* Unfortunately, I don't know how to send a break */
dbg("%s", __FUNCTION__);
}
static void
option_set_termios (struct usb_serial_port *port,
struct termios *old_termios)
{
dbg("%s", __FUNCTION__);
option_send_setup(port);
}
static int
option_tiocmget(struct usb_serial_port *port, struct file *file)
{
unsigned int value;
struct option_port_private *portdata;
portdata = usb_get_serial_port_data(port);
value = ((portdata->rts_state) ? TIOCM_RTS : 0) |
((portdata->dtr_state) ? TIOCM_DTR : 0) |
((portdata->cts_state) ? TIOCM_CTS : 0) |
((portdata->dsr_state) ? TIOCM_DSR : 0) |
((portdata->dcd_state) ? TIOCM_CAR : 0) |
((portdata->ri_state) ? TIOCM_RNG : 0);
return value;
}
static int
option_tiocmset (struct usb_serial_port *port, struct file *file,
unsigned int set, unsigned int clear)
{
struct option_port_private *portdata;
portdata = usb_get_serial_port_data(port);
if (set & TIOCM_RTS)
portdata->rts_state = 1;
if (set & TIOCM_DTR)
portdata->dtr_state = 1;
if (clear & TIOCM_RTS)
portdata->rts_state = 0;
if (clear & TIOCM_DTR)
portdata->dtr_state = 0;
return option_send_setup(port);
}
static int
option_ioctl (struct usb_serial_port *port, struct file *file,
unsigned int cmd, unsigned long arg)
{
return -ENOIOCTLCMD;
}
/* Write */
static int
option_write(struct usb_serial_port *port,
const unsigned char *buf, int count)
{
struct option_port_private *portdata;
int i;
int left, todo;
struct urb *this_urb = NULL; /* spurious */
int err;
portdata = usb_get_serial_port_data(port);
dbg("%s: write (%d chars)", __FUNCTION__, count);
#if 0
spin_lock(&port->lock);
if (port->write_urb_busy) {
spin_unlock(&port->lock);
dbg("%s: already writing", __FUNCTION__);
return 0;
}
port->write_urb_busy = 1;
spin_unlock(&port->lock);
#endif
i = 0;
left = count;
while (left>0) {
todo = left;
if (todo > OUT_BUFLEN)
todo = OUT_BUFLEN;
for (;i < N_OUT_URB; i++) {
/* Check we have a valid urb/endpoint before we use it... */
this_urb = portdata->out_urbs[i];
if (this_urb->status != -EINPROGRESS)
break;
if (this_urb->transfer_flags & URB_ASYNC_UNLINK)
continue;
if (time_before(jiffies, portdata->tx_start_time[i] + 10 * HZ))
continue;
this_urb->transfer_flags |= URB_ASYNC_UNLINK;
usb_unlink_urb(this_urb);
}
if (i == N_OUT_URB) {
/* no bulk out free! */
dbg("%s: no output urb -- left %d", __FUNCTION__,count-left);
#if 0
port->write_urb_busy = 0;
#endif
return count-left;
}
dbg("%s: endpoint %d buf %d", __FUNCTION__, usb_pipeendpoint(this_urb->pipe), i);
memcpy (this_urb->transfer_buffer, buf, todo);
/* send the data out the bulk port */
this_urb->transfer_buffer_length = todo;
this_urb->transfer_flags &= ~URB_ASYNC_UNLINK;
this_urb->dev = port->serial->dev;
err = usb_submit_urb(this_urb, GFP_ATOMIC);
if (err) {
dbg("usb_submit_urb %p (write bulk) failed (%d,, has %d)", this_urb, err, this_urb->status);
continue;
}
portdata->tx_start_time[i] = jiffies;
buf += todo;
left -= todo;
}
count -= left;
#if 0
port->write_urb_busy = 0;
#endif
dbg("%s: wrote (did %d)", __FUNCTION__, count);
return count;
}
static void
option_indat_callback (struct urb *urb, struct pt_regs *regs)
{
int i, err;
int endpoint;
struct usb_serial_port *port;
struct tty_struct *tty;
unsigned char *data = urb->transfer_buffer;
dbg("%s: %p", __FUNCTION__, urb);
endpoint = usb_pipeendpoint(urb->pipe);
port = (struct usb_serial_port *) urb->context;
if (urb->status) {
dbg("%s: nonzero status: %d on endpoint %02x.",
__FUNCTION__, urb->status, endpoint);
} else {
tty = port->tty;
if (urb->actual_length) {
for (i = 0; i < urb->actual_length ; ++i) {
if (tty->flip.count >= TTY_FLIPBUF_SIZE)
tty_flip_buffer_push(tty);
tty_insert_flip_char(tty, data[i], 0);
}
tty_flip_buffer_push(tty);
} else {
dbg("%s: empty read urb received", __FUNCTION__);
}
/* Resubmit urb so we continue receiving */
if (port->open_count && urb->status != -ESHUTDOWN) {
err = usb_submit_urb(urb, GFP_ATOMIC);
if (err)
printk(KERN_ERR "%s: resubmit read urb failed. (%d)", __FUNCTION__, err);
}
}
return;
}
static void
option_outdat_callback (struct urb *urb, struct pt_regs *regs)
{
struct usb_serial_port *port;
dbg("%s", __FUNCTION__);
port = (struct usb_serial_port *) urb->context;
if (port->open_count)
schedule_work(&port->work);
}
static void
option_instat_callback (struct urb *urb, struct pt_regs *regs)
{
int err;
struct usb_serial_port *port = (struct usb_serial_port *) urb->context;
struct option_port_private *portdata = usb_get_serial_port_data(port);
struct usb_serial *serial = port->serial;
dbg("%s", __FUNCTION__);
dbg("%s: urb %p port %p has data %p", __FUNCTION__,urb,port,portdata);
if (urb->status == 0) {
struct usb_ctrlrequest *req_pkt =
(struct usb_ctrlrequest *)urb->transfer_buffer;
if (!req_pkt) {
dbg("%s: NULL req_pkt\n", __FUNCTION__);
return;
}
if ((req_pkt->bRequestType == 0xA1) && (req_pkt->bRequest == 0x20)) {
int old_dcd_state;
unsigned char signals = *((unsigned char *)
urb->transfer_buffer + sizeof(struct usb_ctrlrequest));
dbg("%s: signal x%x", __FUNCTION__, signals);
old_dcd_state = portdata->dcd_state;
portdata->cts_state = 1;
portdata->dcd_state = ((signals & 0x01) ? 1 : 0);
portdata->dsr_state = ((signals & 0x02) ? 1 : 0);
portdata->ri_state = ((signals & 0x08) ? 1 : 0);
if (port->tty && !C_CLOCAL(port->tty)
&& old_dcd_state && !portdata->dcd_state) {
tty_hangup(port->tty);
}
} else
dbg("%s: type %x req %x", __FUNCTION__, req_pkt->bRequestType,req_pkt->bRequest);
} else
dbg("%s: error %d", __FUNCTION__, urb->status);
/* Resubmit urb so we continue receiving IRQ data */
if (urb->status != -ESHUTDOWN) {
urb->dev = serial->dev;
err = usb_submit_urb(urb, GFP_ATOMIC);
if (err)
dbg("%s: resubmit intr urb failed. (%d)", __FUNCTION__, err);
}
}
static int
option_write_room (struct usb_serial_port *port)
{
struct option_port_private *portdata;
int i;
int data_len = 0;
struct urb *this_urb;
portdata = usb_get_serial_port_data(port);
for (i=0; i < N_OUT_URB; i++)
this_urb = portdata->out_urbs[i];
if (this_urb && this_urb->status != -EINPROGRESS)
data_len += OUT_BUFLEN;
dbg("%s: %d", __FUNCTION__, data_len);
return data_len;
}
static int
option_chars_in_buffer (struct usb_serial_port *port)
{
struct option_port_private *portdata;
int i;
int data_len = 0;
struct urb *this_urb;
portdata = usb_get_serial_port_data(port);
for (i=0; i < N_OUT_URB; i++)
this_urb = portdata->out_urbs[i];
if (this_urb && this_urb->status == -EINPROGRESS)
data_len += this_urb->transfer_buffer_length;
dbg("%s: %d", __FUNCTION__, data_len);
return data_len;
}
static int
option_open (struct usb_serial_port *port, struct file *filp)
{
struct option_port_private *portdata;
struct usb_serial *serial = port->serial;
int i, err;
struct urb *urb;
portdata = usb_get_serial_port_data(port);
dbg("%s", __FUNCTION__);
/* Set some sane defaults */
portdata->rts_state = 1;
portdata->dtr_state = 1;
/* Reset low level data toggle and start reading from endpoints */
for (i = 0; i < N_IN_URB; i++) {
urb = portdata->in_urbs[i];
if (! urb)
continue;
if (urb->dev != serial->dev) {
dbg("%s: dev %p != %p", __FUNCTION__, urb->dev, serial->dev);
continue;
}
/* make sure endpoint data toggle is synchronized with the device */
usb_clear_halt(urb->dev, urb->pipe);
err = usb_submit_urb(urb, GFP_KERNEL);
if (err) {
dbg("%s: submit urb %d failed (%d) %d", __FUNCTION__, i, err,
urb->transfer_buffer_length);
}
}
/* Reset low level data toggle on out endpoints */
for (i = 0; i < N_OUT_URB; i++) {
urb = portdata->out_urbs[i];
if (! urb)
continue;
urb->dev = serial->dev;
/* usb_settoggle(urb->dev, usb_pipeendpoint(urb->pipe), usb_pipeout(urb->pipe), 0); */
}
port->tty->low_latency = 1;
option_send_setup(port);
return (0);
}
static inline void
stop_urb(struct urb *urb)
{
if (urb && urb->status == -EINPROGRESS) {
urb->transfer_flags &= ~URB_ASYNC_UNLINK;
usb_kill_urb(urb);
}
}
static void
option_close(struct usb_serial_port *port, struct file *filp)
{
int i;
struct usb_serial *serial = port->serial;
struct option_port_private *portdata;
dbg("%s", __FUNCTION__);
portdata = usb_get_serial_port_data(port);
portdata->rts_state = 0;
portdata->dtr_state = 0;
if (serial->dev) {
option_send_setup(port);
/* Stop reading/writing urbs */
for (i = 0; i < N_IN_URB; i++)
stop_urb(portdata->in_urbs[i]);
for (i = 0; i < N_OUT_URB; i++)
stop_urb(portdata->out_urbs[i]);
}
port->tty = NULL;
}
/* Helper functions used by option_setup_urbs */
static struct urb *
option_setup_urb (struct usb_serial *serial, int endpoint,
int dir, void *ctx, char *buf, int len,
void (*callback)(struct urb *, struct pt_regs *regs))
{
struct urb *urb;
if (endpoint == -1)
return NULL; /* endpoint not needed */
urb = usb_alloc_urb(0, GFP_KERNEL); /* No ISO */
if (urb == NULL) {
dbg("%s: alloc for endpoint %d failed.", __FUNCTION__, endpoint);
return NULL;
}
/* Fill URB using supplied data. */
usb_fill_bulk_urb(urb, serial->dev,
usb_sndbulkpipe(serial->dev, endpoint) | dir,
buf, len, callback, ctx);
return urb;
}
/* Setup urbs */
static void
option_setup_urbs(struct usb_serial *serial)
{
int j;
struct usb_serial_port *port;
struct option_port_private *portdata;
dbg("%s", __FUNCTION__);
port = serial->port[0];
portdata = usb_get_serial_port_data(port);
/* Do indat endpoints first */
for (j = 0; j <= N_IN_URB; ++j) {
portdata->in_urbs[j] = option_setup_urb (serial,
port->bulk_in_endpointAddress, USB_DIR_IN, port,
portdata->in_buffer[j], IN_BUFLEN, option_indat_callback);
}
/* outdat endpoints */
for (j = 0; j <= N_OUT_URB; ++j) {
portdata->out_urbs[j] = option_setup_urb (serial,
port->bulk_out_endpointAddress, USB_DIR_OUT, port,
portdata->out_buffer[j], OUT_BUFLEN, option_outdat_callback);
}
}
static int
option_send_setup(struct usb_serial_port *port)
{
struct usb_serial *serial = port->serial;
struct option_port_private *portdata;
dbg("%s", __FUNCTION__);
portdata = usb_get_serial_port_data(port);
if (port->tty) {
int val = 0;
if (portdata->dtr_state)
val |= 0x01;
if (portdata->rts_state)
val |= 0x02;
return usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
0x22,0x21,val,0,NULL,0,USB_CTRL_SET_TIMEOUT);
}
return 0;
}
static int
option_startup (struct usb_serial *serial)
{
int i, err;
struct usb_serial_port *port;
struct option_port_private *portdata;
dbg("%s", __FUNCTION__);
/* Now setup per port private data */
for (i = 0; i < serial->num_ports; i++) {
port = serial->port[i];
portdata = kmalloc(sizeof(struct option_port_private), GFP_KERNEL);
if (!portdata) {
dbg("%s: kmalloc for option_port_private (%d) failed!.", __FUNCTION__, i);
return (1);
}
memset(portdata, 0, sizeof(struct option_port_private));
usb_set_serial_port_data(port, portdata);
if (! port->interrupt_in_urb)
continue;
err = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
if (err)
dbg("%s: submit irq_in urb failed %d", __FUNCTION__, err);
}
option_setup_urbs(serial);
return (0);
}
static void
option_shutdown (struct usb_serial *serial)
{
int i, j;
struct usb_serial_port *port;
struct option_port_private *portdata;
dbg("%s", __FUNCTION__);
/* Stop reading/writing urbs */
for (i = 0; i < serial->num_ports; ++i) {
port = serial->port[i];
portdata = usb_get_serial_port_data(port);
for (j = 0; j < N_IN_URB; j++)
stop_urb(portdata->in_urbs[j]);
for (j = 0; j < N_OUT_URB; j++)
stop_urb(portdata->out_urbs[j]);
}
/* Now free them */
for (i = 0; i < serial->num_ports; ++i) {
port = serial->port[i];
portdata = usb_get_serial_port_data(port);
for (j = 0; j < N_IN_URB; j++) {
if (portdata->in_urbs[j]) {
usb_free_urb(portdata->in_urbs[j]);
portdata->in_urbs[j] = NULL;
}
}
for (j = 0; j < N_OUT_URB; j++) {
if (portdata->out_urbs[j]) {
usb_free_urb(portdata->out_urbs[j]);
portdata->out_urbs[j] = NULL;
}
}
}
/* Now free per port private data */
for (i = 0; i < serial->num_ports; i++) {
port = serial->port[i];
kfree(usb_get_serial_port_data(port));
}
}
MODULE_AUTHOR(DRIVER_AUTHOR);
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_VERSION(DRIVER_VERSION);
MODULE_LICENSE("GPL");
module_param(debug, bool, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(debug, "Debug messages");
