linux/drivers/usb/serial/omninet.c
Alan Cox 335f8514f2 tty: Bring the usb tty port structure into more use
This allows us to clean stuff up, but is probably also going to cause
some app breakage with buggy apps as we now implement proper POSIX behaviour
for USB ports matching all the other ports. This does also mean other apps
that break on USB will now work properly.

Signed-off-by: Alan Cox <alan@lxorguk.ukuu.org.uk>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2009-06-11 08:50:56 -07:00

394 lines
10 KiB
C

/*
* USB ZyXEL omni.net LCD PLUS driver
*
* 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.
*
* See Documentation/usb/usb-serial.txt for more information on using this
* driver
*
* Please report both successes and troubles to the author at omninet@kroah.com
*
* (05/30/2001) gkh
* switched from using spinlock to a semaphore, which fixes lots of
* problems.
*
* (04/08/2001) gb
* Identify version on module load.
*
* (11/01/2000) Adam J. Richter
* usb_device_id table support
*
* (10/05/2000) gkh
* Fixed bug with urb->dev not being set properly, now that the usb
* core needs it.
*
* (08/28/2000) gkh
* Added locks for SMP safeness.
* Fixed MOD_INC and MOD_DEC logic and the ability to open a port more
* than once.
* Fixed potential race in omninet_write_bulk_callback
*
* (07/19/2000) gkh
* Added module_init and module_exit functions to handle the fact that this
* driver is a loadable module now.
*
*/
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/tty.h>
#include <linux/tty_driver.h>
#include <linux/tty_flip.h>
#include <linux/module.h>
#include <linux/spinlock.h>
#include <linux/uaccess.h>
#include <linux/usb.h>
#include <linux/usb/serial.h>
static int debug;
/*
* Version Information
*/
#define DRIVER_VERSION "v1.1"
#define DRIVER_AUTHOR "Alessandro Zummo"
#define DRIVER_DESC "USB ZyXEL omni.net LCD PLUS Driver"
#define ZYXEL_VENDOR_ID 0x0586
#define ZYXEL_OMNINET_ID 0x1000
/* This one seems to be a re-branded ZyXEL device */
#define BT_IGNITIONPRO_ID 0x2000
/* function prototypes */
static int omninet_open(struct tty_struct *tty, struct usb_serial_port *port,
struct file *filp);
static void omninet_close(struct usb_serial_port *port);
static void omninet_read_bulk_callback(struct urb *urb);
static void omninet_write_bulk_callback(struct urb *urb);
static int omninet_write(struct tty_struct *tty, struct usb_serial_port *port,
const unsigned char *buf, int count);
static int omninet_write_room(struct tty_struct *tty);
static void omninet_shutdown(struct usb_serial *serial);
static int omninet_attach(struct usb_serial *serial);
static struct usb_device_id id_table[] = {
{ USB_DEVICE(ZYXEL_VENDOR_ID, ZYXEL_OMNINET_ID) },
{ USB_DEVICE(ZYXEL_VENDOR_ID, BT_IGNITIONPRO_ID) },
{ } /* Terminating entry */
};
MODULE_DEVICE_TABLE(usb, id_table);
static struct usb_driver omninet_driver = {
.name = "omninet",
.probe = usb_serial_probe,
.disconnect = usb_serial_disconnect,
.id_table = id_table,
.no_dynamic_id = 1,
};
static struct usb_serial_driver zyxel_omninet_device = {
.driver = {
.owner = THIS_MODULE,
.name = "omninet",
},
.description = "ZyXEL - omni.net lcd plus usb",
.usb_driver = &omninet_driver,
.id_table = id_table,
.num_ports = 1,
.attach = omninet_attach,
.open = omninet_open,
.close = omninet_close,
.write = omninet_write,
.write_room = omninet_write_room,
.read_bulk_callback = omninet_read_bulk_callback,
.write_bulk_callback = omninet_write_bulk_callback,
.shutdown = omninet_shutdown,
};
/* The protocol.
*
* The omni.net always exchange 64 bytes of data with the host. The first
* four bytes are the control header, you can see it in the above structure.
*
* oh_seq is a sequence number. Don't know if/how it's used.
* oh_len is the length of the data bytes in the packet.
* oh_xxx Bit-mapped, related to handshaking and status info.
* I normally set it to 0x03 in trasmitted frames.
* 7: Active when the TA is in a CONNECTed state.
* 6: unknown
* 5: handshaking, unknown
* 4: handshaking, unknown
* 3: unknown, usually 0
* 2: unknown, usually 0
* 1: handshaking, unknown, usually set to 1 in trasmitted frames
* 0: handshaking, unknown, usually set to 1 in trasmitted frames
* oh_pad Probably a pad byte.
*
* After the header you will find data bytes if oh_len was greater than zero.
*
*/
struct omninet_header {
__u8 oh_seq;
__u8 oh_len;
__u8 oh_xxx;
__u8 oh_pad;
};
struct omninet_data {
__u8 od_outseq; /* Sequence number for bulk_out URBs */
};
static int omninet_attach(struct usb_serial *serial)
{
struct omninet_data *od;
struct usb_serial_port *port = serial->port[0];
od = kmalloc(sizeof(struct omninet_data), GFP_KERNEL);
if (!od) {
dev_err(&port->dev, "%s- kmalloc(%Zd) failed.\n",
__func__, sizeof(struct omninet_data));
return -ENOMEM;
}
usb_set_serial_port_data(port, od);
return 0;
}
static int omninet_open(struct tty_struct *tty,
struct usb_serial_port *port, struct file *filp)
{
struct usb_serial *serial = port->serial;
struct usb_serial_port *wport;
int result = 0;
dbg("%s - port %d", __func__, port->number);
wport = serial->port[1];
tty_port_tty_set(&wport->port, tty);
/* Start reading from the device */
usb_fill_bulk_urb(port->read_urb, serial->dev,
usb_rcvbulkpipe(serial->dev,
port->bulk_in_endpointAddress),
port->read_urb->transfer_buffer,
port->read_urb->transfer_buffer_length,
omninet_read_bulk_callback, port);
result = usb_submit_urb(port->read_urb, GFP_KERNEL);
if (result)
dev_err(&port->dev,
"%s - failed submitting read urb, error %d\n",
__func__, result);
return result;
}
static void omninet_close(struct usb_serial_port *port)
{
dbg("%s - port %d", __func__, port->number);
usb_kill_urb(port->read_urb);
}
#define OMNINET_DATAOFFSET 0x04
#define OMNINET_HEADERLEN sizeof(struct omninet_header)
#define OMNINET_BULKOUTSIZE (64 - OMNINET_HEADERLEN)
static void omninet_read_bulk_callback(struct urb *urb)
{
struct usb_serial_port *port = urb->context;
unsigned char *data = urb->transfer_buffer;
struct omninet_header *header = (struct omninet_header *) &data[0];
int status = urb->status;
int result;
int i;
dbg("%s - port %d", __func__, port->number);
if (status) {
dbg("%s - nonzero read bulk status received: %d",
__func__, status);
return;
}
if (debug && header->oh_xxx != 0x30) {
if (urb->actual_length) {
printk(KERN_DEBUG __FILE__
": omninet_read %d: ", header->oh_len);
for (i = 0; i < (header->oh_len +
OMNINET_HEADERLEN); i++)
printk("%.2x ", data[i]);
printk("\n");
}
}
if (urb->actual_length && header->oh_len) {
struct tty_struct *tty = tty_port_tty_get(&port->port);
tty_insert_flip_string(tty, data + OMNINET_DATAOFFSET,
header->oh_len);
tty_flip_buffer_push(tty);
tty_kref_put(tty);
}
/* Continue trying to always read */
usb_fill_bulk_urb(urb, port->serial->dev,
usb_rcvbulkpipe(port->serial->dev,
port->bulk_in_endpointAddress),
urb->transfer_buffer, urb->transfer_buffer_length,
omninet_read_bulk_callback, port);
result = usb_submit_urb(urb, GFP_ATOMIC);
if (result)
dev_err(&port->dev,
"%s - failed resubmitting read urb, error %d\n",
__func__, result);
return;
}
static int omninet_write(struct tty_struct *tty, struct usb_serial_port *port,
const unsigned char *buf, int count)
{
struct usb_serial *serial = port->serial;
struct usb_serial_port *wport = serial->port[1];
struct omninet_data *od = usb_get_serial_port_data(port);
struct omninet_header *header = (struct omninet_header *)
wport->write_urb->transfer_buffer;
int result;
dbg("%s - port %d", __func__, port->number);
if (count == 0) {
dbg("%s - write request of 0 bytes", __func__);
return 0;
}
spin_lock_bh(&wport->lock);
if (wport->write_urb_busy) {
spin_unlock_bh(&wport->lock);
dbg("%s - already writing", __func__);
return 0;
}
wport->write_urb_busy = 1;
spin_unlock_bh(&wport->lock);
count = (count > OMNINET_BULKOUTSIZE) ? OMNINET_BULKOUTSIZE : count;
memcpy(wport->write_urb->transfer_buffer + OMNINET_DATAOFFSET,
buf, count);
usb_serial_debug_data(debug, &port->dev, __func__, count,
wport->write_urb->transfer_buffer);
header->oh_seq = od->od_outseq++;
header->oh_len = count;
header->oh_xxx = 0x03;
header->oh_pad = 0x00;
/* send the data out the bulk port, always 64 bytes */
wport->write_urb->transfer_buffer_length = 64;
wport->write_urb->dev = serial->dev;
result = usb_submit_urb(wport->write_urb, GFP_ATOMIC);
if (result) {
wport->write_urb_busy = 0;
dev_err(&port->dev,
"%s - failed submitting write urb, error %d\n",
__func__, result);
} else
result = count;
return result;
}
static int omninet_write_room(struct tty_struct *tty)
{
struct usb_serial_port *port = tty->driver_data;
struct usb_serial *serial = port->serial;
struct usb_serial_port *wport = serial->port[1];
int room = 0; /* Default: no room */
/* FIXME: no consistent locking for write_urb_busy */
if (wport->write_urb_busy)
room = wport->bulk_out_size - OMNINET_HEADERLEN;
dbg("%s - returns %d", __func__, room);
return room;
}
static void omninet_write_bulk_callback(struct urb *urb)
{
/* struct omninet_header *header = (struct omninet_header *)
urb->transfer_buffer; */
struct usb_serial_port *port = urb->context;
int status = urb->status;
dbg("%s - port %0x\n", __func__, port->number);
port->write_urb_busy = 0;
if (status) {
dbg("%s - nonzero write bulk status received: %d",
__func__, status);
return;
}
usb_serial_port_softint(port);
}
static void omninet_shutdown(struct usb_serial *serial)
{
struct usb_serial_port *wport = serial->port[1];
struct usb_serial_port *port = serial->port[0];
dbg("%s", __func__);
usb_kill_urb(wport->write_urb);
kfree(usb_get_serial_port_data(port));
}
static int __init omninet_init(void)
{
int retval;
retval = usb_serial_register(&zyxel_omninet_device);
if (retval)
goto failed_usb_serial_register;
retval = usb_register(&omninet_driver);
if (retval)
goto failed_usb_register;
printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":"
DRIVER_DESC "\n");
return 0;
failed_usb_register:
usb_serial_deregister(&zyxel_omninet_device);
failed_usb_serial_register:
return retval;
}
static void __exit omninet_exit(void)
{
usb_deregister(&omninet_driver);
usb_serial_deregister(&zyxel_omninet_device);
}
module_init(omninet_init);
module_exit(omninet_exit);
MODULE_AUTHOR(DRIVER_AUTHOR);
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL");
module_param(debug, bool, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(debug, "Debug enabled or not");