option.c

linux-2.6.15.6

/*
  Option Card (PCMCIA to) USB to Serial Driver

  Copyright (C) 2005  Matthias Urlichs <[e-mail]>

  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 <[e-mail]>

  History:

  2005-05-19  v0.1   Initial version, based on incomplete docs
                     and analysis of misbehavior with 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
  2005-05-24  v0.4   option_write() sometimes deadlocked under heavy load
                     removed some dead code
                     added sponsor notice
                     coding style clean-up
  2005-06-20  v0.4.1 add missing braces :-/
                     killed end-of-line whitespace
  2005-07-15  v0.4.2 rename WLAN product to FUSION, add FUSION2
  2005-09-10  v0.4.3 added HUAWEI E600 card and Audiovox AirCard
  2005-09-20  v0.4.4 increased recv buffer size: the card sometimes
                     wants to send >2000 bytes.

  Work sponsored by: Sigos GmbH, Germany <[e-mail]>

*/

#define DRIVER_VERSION "v0.4"
#define DRIVER_AUTHOR "Matthias Urlichs <[e-mail]>"
#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 HUAWEI_VENDOR_ID			0x12D1
#define AUDIOVOX_VENDOR_ID			0x0F3D

#define OPTION_PRODUCT_OLD		0x5000
#define OPTION_PRODUCT_FUSION	0x6000
#define OPTION_PRODUCT_FUSION2	0x6300
#define HUAWEI_PRODUCT_E600     0x1001
#define AUDIOVOX_PRODUCT_AIRCARD 0x0112

static struct usb_device_id option_ids[] = {
	{ USB_DEVICE(OPTION_VENDOR_ID, OPTION_PRODUCT_OLD) },
	{ USB_DEVICE(OPTION_VENDOR_ID, OPTION_PRODUCT_FUSION) },
	{ USB_DEVICE(OPTION_VENDOR_ID, OPTION_PRODUCT_FUSION2) },
	{ USB_DEVICE(HUAWEI_VENDOR_ID, HUAWEI_PRODUCT_E600) },
	{ USB_DEVICE(AUDIOVOX_VENDOR_ID, AUDIOVOX_PRODUCT_AIRCARD) },
	{ } /* 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_driver option_3port_device = {
	.driver = {
		.owner =	THIS_MODULE,
		.name =		"option",
	},
	.description       = "Option 3G data card",
	.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, but the card reports its ports separately */
	.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,
};

#ifdef CONFIG_USB_DEBUG
static int debug;
#else
#define debug 0
#endif

/* per port private data */

#define N_IN_URB 4
#define N_OUT_URB 1
#define IN_BUFLEN 4096
#define OUT_BUFLEN 128

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;

	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);

	i = 0;
	left = count;
	for (i=0; left > 0 && i < N_OUT_URB; i++) {
		todo = left;
		if (todo > OUT_BUFLEN)
			todo = OUT_BUFLEN;

		this_urb = portdata->out_urbs[i];
		if (this_urb->status == -EINPROGRESS) {
			if (time_before(jiffies,
					portdata->tx_start_time[i] + 10 * HZ))
				continue;
			usb_unlink_urb(this_urb);
			continue;
		}
		if (this_urb->status != 0)
			dbg("usb_write %p failed (err=%d)",
				this_urb, this_urb->status);

		dbg("%s: endpoint %d buf %d", __FUNCTION__,
			usb_pipeendpoint(this_urb->pipe), i);

		/* send the data */
		memcpy (this_urb->transfer_buffer, buf, todo);
		this_urb->transfer_buffer_length = todo;

		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;
	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);
		}