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linux-next/drivers/usb/serial/ark3116.c
Alan Cox 95da310e66 usb_serial: API all change 
USB serial likes to use port->tty back pointers for the real work it does and
to do so without any actual locking. Unfortunately when you consider hangup
events, hangup/parallel reopen or even worse hangup followed by parallel close
events the tty->port and port->tty pointers are not guaranteed to be the same
as port->tty is the active tty while tty->port is the port the tty may or
may not still be attached to.

So rework the entire API to pass the tty struct. For console cases we need
to pass both for now. This shows up multiple drivers that immediately crash
with USB console some of which have been fixed in the process.

Longer term we need a proper tty as console abstraction

Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-07-22 13:03:22 -07:00

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/*
* Copyright (C) 2006
* Simon Schulz (ark3116_driver <at> auctionant.de)
*
* ark3116
* - implements a driver for the arkmicro ark3116 chipset (vendor=0x6547,
* productid=0x0232) (used in a datacable called KQ-U8A)
*
* - based on code by krisfx -> thanks !!
* (see http://www.linuxquestions.org/questions/showthread.php?p=2184457#post2184457)
*
* - based on logs created by usbsnoopy
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*/
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/tty.h>
#include <linux/module.h>
#include <linux/usb.h>
#include <linux/usb/serial.h>
#include <linux/serial.h>
#include <linux/uaccess.h>
static int debug;
static struct usb_device_id id_table [] = {
{ USB_DEVICE(0x6547, 0x0232) },
{ },
};
MODULE_DEVICE_TABLE(usb, id_table);
struct ark3116_private {
spinlock_t lock;
u8 termios_initialized;
};
static inline void ARK3116_SND(struct usb_serial *serial, int seq,
__u8 request, __u8 requesttype,
__u16 value, __u16 index)
{
int result;
result = usb_control_msg(serial->dev,
usb_sndctrlpipe(serial->dev, 0),
request, requesttype, value, index,
NULL, 0x00, 1000);
dbg("%03d > ok", seq);
}
static inline void ARK3116_RCV(struct usb_serial *serial, int seq,
__u8 request, __u8 requesttype,
__u16 value, __u16 index, __u8 expected,
char *buf)
{
int result;
result = usb_control_msg(serial->dev,
usb_rcvctrlpipe(serial->dev, 0),
request, requesttype, value, index,
buf, 0x0000001, 1000);
if (result)
dbg("%03d < %d bytes [0x%02X]", seq, result,
((unsigned char *)buf)[0]);
else
dbg("%03d < 0 bytes", seq);
}
static inline void ARK3116_RCV_QUIET(struct usb_serial *serial,
__u8 request, __u8 requesttype,
__u16 value, __u16 index, char *buf)
{
usb_control_msg(serial->dev,
usb_rcvctrlpipe(serial->dev, 0),
request, requesttype, value, index,
buf, 0x0000001, 1000);
}
static int ark3116_attach(struct usb_serial *serial)
{
char *buf;
struct ark3116_private *priv;
int i;
for (i = 0; i < serial->num_ports; ++i) {
priv = kzalloc(sizeof(struct ark3116_private), GFP_KERNEL);
if (!priv)
goto cleanup;
spin_lock_init(&priv->lock);
usb_set_serial_port_data(serial->port[i], priv);
}
buf = kmalloc(1, GFP_KERNEL);
if (!buf) {
dbg("error kmalloc -> out of mem?");
goto cleanup;
}
/* 3 */
ARK3116_SND(serial, 3, 0xFE, 0x40, 0x0008, 0x0002);
ARK3116_SND(serial, 4, 0xFE, 0x40, 0x0008, 0x0001);
ARK3116_SND(serial, 5, 0xFE, 0x40, 0x0000, 0x0008);
ARK3116_SND(serial, 6, 0xFE, 0x40, 0x0000, 0x000B);
/* <-- seq7 */
ARK3116_RCV(serial, 7, 0xFE, 0xC0, 0x0000, 0x0003, 0x00, buf);
ARK3116_SND(serial, 8, 0xFE, 0x40, 0x0080, 0x0003);
ARK3116_SND(serial, 9, 0xFE, 0x40, 0x001A, 0x0000);
ARK3116_SND(serial, 10, 0xFE, 0x40, 0x0000, 0x0001);
ARK3116_SND(serial, 11, 0xFE, 0x40, 0x0000, 0x0003);
/* <-- seq12 */
ARK3116_RCV(serial, 12, 0xFE, 0xC0, 0x0000, 0x0004, 0x00, buf);
ARK3116_SND(serial, 13, 0xFE, 0x40, 0x0000, 0x0004);
/* 14 */
ARK3116_RCV(serial, 14, 0xFE, 0xC0, 0x0000, 0x0004, 0x00, buf);
ARK3116_SND(serial, 15, 0xFE, 0x40, 0x0000, 0x0004);
/* 16 */
ARK3116_RCV(serial, 16, 0xFE, 0xC0, 0x0000, 0x0004, 0x00, buf);
/* --> seq17 */
ARK3116_SND(serial, 17, 0xFE, 0x40, 0x0001, 0x0004);
/* <-- seq18 */
ARK3116_RCV(serial, 18, 0xFE, 0xC0, 0x0000, 0x0004, 0x01, buf);
/* --> seq19 */
ARK3116_SND(serial, 19, 0xFE, 0x40, 0x0003, 0x0004);
/* <-- seq20 */
/* seems like serial port status info (RTS, CTS, ...) */
/* returns modem control line status?! */
ARK3116_RCV(serial, 20, 0xFE, 0xC0, 0x0000, 0x0006, 0xFF, buf);
/* set 9600 baud & do some init?! */
ARK3116_SND(serial, 147, 0xFE, 0x40, 0x0083, 0x0003);
ARK3116_SND(serial, 148, 0xFE, 0x40, 0x0038, 0x0000);
ARK3116_SND(serial, 149, 0xFE, 0x40, 0x0001, 0x0001);
ARK3116_SND(serial, 150, 0xFE, 0x40, 0x0003, 0x0003);
ARK3116_RCV(serial, 151, 0xFE, 0xC0, 0x0000, 0x0004, 0x03, buf);
ARK3116_SND(serial, 152, 0xFE, 0x40, 0x0000, 0x0003);
ARK3116_RCV(serial, 153, 0xFE, 0xC0, 0x0000, 0x0003, 0x00, buf);
ARK3116_SND(serial, 154, 0xFE, 0x40, 0x0003, 0x0003);
kfree(buf);
return 0;
cleanup:
for (--i; i >= 0; --i) {
kfree(usb_get_serial_port_data(serial->port[i]));
usb_set_serial_port_data(serial->port[i], NULL);
}
return -ENOMEM;
}
static void ark3116_set_termios(struct tty_struct *tty,
struct usb_serial_port *port,
struct ktermios *old_termios)
{
struct usb_serial *serial = port->serial;
struct ark3116_private *priv = usb_get_serial_port_data(port);
struct ktermios *termios = tty->termios;
unsigned int cflag = termios->c_cflag;
unsigned long flags;
int baud;
int ark3116_baud;
char *buf;
char config;
config = 0;
dbg("%s - port %d", __func__, port->number);
spin_lock_irqsave(&priv->lock, flags);
if (!priv->termios_initialized) {
*termios = tty_std_termios;
termios->c_cflag = B9600 | CS8
| CREAD | HUPCL | CLOCAL;
termios->c_ispeed = 9600;
termios->c_ospeed = 9600;
priv->termios_initialized = 1;
}
spin_unlock_irqrestore(&priv->lock, flags);
cflag = termios->c_cflag;
termios->c_cflag &= ~(CMSPAR|CRTSCTS);
buf = kmalloc(1, GFP_KERNEL);
if (!buf) {
dbg("error kmalloc");
*termios = *old_termios;
return;
}
/* set data bit count (8/7/6/5) */
if (cflag & CSIZE) {
switch (cflag & CSIZE) {
case CS5:
config |= 0x00;
dbg("setting CS5");
break;
case CS6:
config |= 0x01;
dbg("setting CS6");
break;
case CS7:
config |= 0x02;
dbg("setting CS7");
break;
default:
dbg("CSIZE was set but not CS5-CS8, using CS8!");
/* fall through */
case CS8:
config |= 0x03;
dbg("setting CS8");
break;
}
}
/* set parity (NONE/EVEN/ODD) */
if (cflag & PARENB) {
if (cflag & PARODD) {
config |= 0x08;
dbg("setting parity to ODD");
} else {
config |= 0x18;
dbg("setting parity to EVEN");
}
} else {
dbg("setting parity to NONE");
}
/* set stop bit (1/2) */
if (cflag & CSTOPB) {
config |= 0x04;
dbg("setting 2 stop bits");
} else {
dbg("setting 1 stop bit");
}
/* set baudrate */
baud = tty_get_baud_rate(tty);
switch (baud) {
case 75:
case 150:
case 300:
case 600:
case 1200:
case 1800:
case 2400:
case 4800:
case 9600:
case 19200:
case 38400:
case 57600:
case 115200:
case 230400:
case 460800:
/* Report the resulting rate back to the caller */
tty_encode_baud_rate(tty, baud, baud);
break;
/* set 9600 as default (if given baudrate is invalid for example) */
default:
tty_encode_baud_rate(tty, 9600, 9600);
case 0:
baud = 9600;
}
/*
* found by try'n'error, be careful, maybe there are other options
* for multiplicator etc! (3.5 for example)
*/
if (baud == 460800)
/* strange, for 460800 the formula is wrong
* if using round() then 9600baud is wrong) */
ark3116_baud = 7;
else
ark3116_baud = 3000000 / baud;
/* ? */
ARK3116_RCV(serial, 0, 0xFE, 0xC0, 0x0000, 0x0003, 0x03, buf);
/* offset = buf[0]; */
/* offset = 0x03; */
/* dbg("using 0x%04X as target for 0x0003:", 0x0080 + offset); */
/* set baudrate */
dbg("setting baudrate to %d (->reg=%d)", baud, ark3116_baud);
ARK3116_SND(serial, 147, 0xFE, 0x40, 0x0083, 0x0003);
ARK3116_SND(serial, 148, 0xFE, 0x40,
(ark3116_baud & 0x00FF), 0x0000);
ARK3116_SND(serial, 149, 0xFE, 0x40,
(ark3116_baud & 0xFF00) >> 8, 0x0001);
ARK3116_SND(serial, 150, 0xFE, 0x40, 0x0003, 0x0003);
/* ? */
ARK3116_RCV(serial, 151, 0xFE, 0xC0, 0x0000, 0x0004, 0x03, buf);
ARK3116_SND(serial, 152, 0xFE, 0x40, 0x0000, 0x0003);
/* set data bit count, stop bit count & parity: */
dbg("updating bit count, stop bit or parity (cfg=0x%02X)", config);
ARK3116_RCV(serial, 153, 0xFE, 0xC0, 0x0000, 0x0003, 0x00, buf);
ARK3116_SND(serial, 154, 0xFE, 0x40, config, 0x0003);
if (cflag & CRTSCTS)
dbg("CRTSCTS not supported by chipset?!");
/* TEST ARK3116_SND(154, 0xFE, 0x40, 0xFFFF, 0x0006); */
kfree(buf);
return;
}
static int ark3116_open(struct tty_struct *tty, struct usb_serial_port *port,
struct file *filp)
{
struct ktermios tmp_termios;
struct usb_serial *serial = port->serial;
char *buf;
int result = 0;
dbg("%s - port %d", __func__, port->number);
buf = kmalloc(1, GFP_KERNEL);
if (!buf) {
dbg("error kmalloc -> out of mem?");
return -ENOMEM;
}
result = usb_serial_generic_open(tty, port, filp);
if (result)
goto err_out;
/* open */
ARK3116_RCV(serial, 111, 0xFE, 0xC0, 0x0000, 0x0003, 0x02, buf);
ARK3116_SND(serial, 112, 0xFE, 0x40, 0x0082, 0x0003);
ARK3116_SND(serial, 113, 0xFE, 0x40, 0x001A, 0x0000);
ARK3116_SND(serial, 114, 0xFE, 0x40, 0x0000, 0x0001);
ARK3116_SND(serial, 115, 0xFE, 0x40, 0x0002, 0x0003);
ARK3116_RCV(serial, 116, 0xFE, 0xC0, 0x0000, 0x0004, 0x03, buf);
ARK3116_SND(serial, 117, 0xFE, 0x40, 0x0002, 0x0004);
ARK3116_RCV(serial, 118, 0xFE, 0xC0, 0x0000, 0x0004, 0x02, buf);
ARK3116_SND(serial, 119, 0xFE, 0x40, 0x0000, 0x0004);
ARK3116_RCV(serial, 120, 0xFE, 0xC0, 0x0000, 0x0004, 0x00, buf);
ARK3116_SND(serial, 121, 0xFE, 0x40, 0x0001, 0x0004);
ARK3116_RCV(serial, 122, 0xFE, 0xC0, 0x0000, 0x0004, 0x01, buf);
ARK3116_SND(serial, 123, 0xFE, 0x40, 0x0003, 0x0004);
/* returns different values (control lines?!) */
ARK3116_RCV(serial, 124, 0xFE, 0xC0, 0x0000, 0x0006, 0xFF, buf);
/* initialise termios */
if (tty)
ark3116_set_termios(tty, port, &tmp_termios);
err_out:
kfree(buf);
return result;
}
static int ark3116_ioctl(struct tty_struct *tty, struct file *file,
unsigned int cmd, unsigned long arg)
{
struct usb_serial_port *port = tty->driver_data;
struct serial_struct serstruct;
void __user *user_arg = (void __user *)arg;
switch (cmd) {
case TIOCGSERIAL:
/* XXX: Some of these values are probably wrong. */
memset(&serstruct, 0, sizeof(serstruct));
serstruct.type = PORT_16654;
serstruct.line = port->serial->minor;
serstruct.port = port->number;
serstruct.custom_divisor = 0;
serstruct.baud_base = 460800;
if (copy_to_user(user_arg, &serstruct, sizeof(serstruct)))
return -EFAULT;
return 0;
case TIOCSSERIAL:
if (copy_from_user(&serstruct, user_arg, sizeof(serstruct)))
return -EFAULT;
return 0;
default:
dbg("%s cmd 0x%04x not supported", __func__, cmd);
break;
}
return -ENOIOCTLCMD;
}
static int ark3116_tiocmget(struct tty_struct *tty, struct file *file)
{
struct usb_serial_port *port = tty->driver_data;
struct usb_serial *serial = port->serial;
char *buf;
char temp;
/* seems like serial port status info (RTS, CTS, ...) is stored
* in reg(?) 0x0006
* pcb connection point 11 = GND -> sets bit4 of response
* pcb connection point 7 = GND -> sets bit6 of response
*/
buf = kmalloc(1, GFP_KERNEL);
if (!buf) {
dbg("error kmalloc");
return -ENOMEM;
}
/* read register */
ARK3116_RCV_QUIET(serial, 0xFE, 0xC0, 0x0000, 0x0006, buf);
temp = buf[0];
kfree(buf);
/* i do not really know if bit4=CTS and bit6=DSR... just a
* quick guess!
*/
return (temp & (1<<4) ? TIOCM_CTS : 0)
| (temp & (1<<6) ? TIOCM_DSR : 0);
}
static struct usb_driver ark3116_driver = {
.name = "ark3116",
.probe = usb_serial_probe,
.disconnect = usb_serial_disconnect,
.id_table = id_table,
.no_dynamic_id = 1,
};
static struct usb_serial_driver ark3116_device = {
.driver = {
.owner = THIS_MODULE,
.name = "ark3116",
},
.id_table = id_table,
.usb_driver = &ark3116_driver,
.num_ports = 1,
.attach = ark3116_attach,
.set_termios = ark3116_set_termios,
.ioctl = ark3116_ioctl,
.tiocmget = ark3116_tiocmget,
.open = ark3116_open,
};
static int __init ark3116_init(void)
{
int retval;
retval = usb_serial_register(&ark3116_device);
if (retval)
return retval;
retval = usb_register(&ark3116_driver);
if (retval)
usb_serial_deregister(&ark3116_device);
return retval;
}
static void __exit ark3116_exit(void)
{
usb_deregister(&ark3116_driver);
usb_serial_deregister(&ark3116_device);
}
module_init(ark3116_init);
module_exit(ark3116_exit);
MODULE_LICENSE("GPL");
module_param(debug, bool, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(debug, "Debug enabled or not");
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