// SPDX-License-Identifier: GPL-2.0+
/*
* KLSI KL5KUSB105 chip RS232 converter driver
*
* Copyright (C) 2010 Johan Hovold <[email protected]>
* Copyright (C) 2001 Utz-Uwe Haus <[email protected]>
*
* All information about the device was acquired using SniffUSB ans snoopUSB
* on Windows98.
* It was written out of frustration with the PalmConnect USB Serial adapter
* sold by Palm Inc.
* Neither Palm, nor their contractor (MCCI) or their supplier (KLSI) provided
* information that was not already available.
*
* It seems that KLSI bought some silicon-design information from ScanLogic,
* whose SL11R processor is at the core of the KL5KUSB chipset from KLSI.
* KLSI has firmware available for their devices; it is probable that the
* firmware differs from that used by KLSI in their products. If you have an
* original KLSI device and can provide some information on it, I would be
* most interested in adding support for it here. If you have any information
* on the protocol used (or find errors in my reverse-engineered stuff), please
* let me know.
*
* The code was only tested with a PalmConnect USB adapter; if you
* are adventurous, try it with any KLSI-based device and let me know how it
* breaks so that I can fix it!
*/
/* TODO:
* check modem line signals
* implement handshaking or decide that we do not support it
*/
#include <linux/kernel.h>
#include <linux/errno.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/uaccess.h>
#include <linux/unaligned.h>
#include <linux/usb.h>
#include <linux/usb/serial.h>
#include "kl5kusb105.h"
#define DRIVER_AUTHOR "Utz-Uwe Haus <[email protected]>, Johan Hovold <[email protected]>"
#define DRIVER_DESC "KLSI KL5KUSB105 chipset USB->Serial Converter driver"
/*
* Function prototypes
*/
static int klsi_105_port_probe(struct usb_serial_port *port);
static void klsi_105_port_remove(struct usb_serial_port *port);
static int klsi_105_open(struct tty_struct *tty, struct usb_serial_port *port);
static void klsi_105_close(struct usb_serial_port *port);
static void klsi_105_set_termios(struct tty_struct *tty,
struct usb_serial_port *port,
const struct ktermios *old_termios);
static int klsi_105_tiocmget(struct tty_struct *tty);
static void klsi_105_process_read_urb(struct urb *urb);
static int klsi_105_prepare_write_buffer(struct usb_serial_port *port,
void *dest, size_t size);
/*
* All of the device info needed for the KLSI converters.
*/
static const struct usb_device_id id_table[] = {
{ USB_DEVICE(PALMCONNECT_VID, PALMCONNECT_PID) },
{ } /* Terminating entry */
};
MODULE_DEVICE_TABLE(usb, id_table);
static struct usb_serial_driver kl5kusb105d_device = {
.driver = {
.name = "kl5kusb105d",
},
.description = "KL5KUSB105D / PalmConnect",
.id_table = id_table,
.num_ports = 1,
.bulk_out_size = 64,
.open = klsi_105_open,
.close = klsi_105_close,
.set_termios = klsi_105_set_termios,
.tiocmget = klsi_105_tiocmget,
.port_probe = klsi_105_port_probe,
.port_remove = klsi_105_port_remove,
.throttle = usb_serial_generic_throttle,
.unthrottle = usb_serial_generic_unthrottle,
.process_read_urb = klsi_105_process_read_urb,
.prepare_write_buffer = klsi_105_prepare_write_buffer,
};
static struct usb_serial_driver * const serial_drivers[] = {
&kl5kusb105d_device, NULL
};
struct klsi_105_port_settings {
u8 pktlen; /* always 5, it seems */
u8 baudrate;
u8 databits;
u8 unknown1;
u8 unknown2;
};
struct klsi_105_private {
struct klsi_105_port_settings cfg;
unsigned long line_state; /* modem line settings */
spinlock_t lock;
};
/*
* Handle vendor specific USB requests
*/
#define KLSI_TIMEOUT 5000 /* default urb timeout */
static int klsi_105_chg_port_settings(struct usb_serial_port *port,
struct klsi_105_port_settings *settings)
{
int rc;
rc = usb_control_msg_send(port->serial->dev,
0,
KL5KUSB105A_SIO_SET_DATA,
USB_TYPE_VENDOR | USB_DIR_OUT |
USB_RECIP_INTERFACE,
0, /* value */
0, /* index */
settings,
sizeof(struct klsi_105_port_settings),
KLSI_TIMEOUT,
GFP_KERNEL);
if (rc)
dev_err(&port->dev,
"Change port settings failed (error = %d)\n", rc);
dev_dbg(&port->dev,
"pktlen %u, baudrate 0x%02x, databits %u, u1 %u, u2 %u\n",
settings->pktlen, settings->baudrate, settings->databits,
settings->unknown1, settings->unknown2);
return rc;
}
/*
* Read line control via vendor command and return result through
* the state pointer.
*/
static int klsi_105_get_line_state(struct usb_serial_port *port,
unsigned long *state)
{
u16 status;
int rc;
rc = usb_control_msg_recv(port->serial->dev, 0,
KL5KUSB105A_SIO_POLL,
USB_TYPE_VENDOR | USB_DIR_IN,
0, /* value */
0, /* index */
&status, sizeof(status),
10000,
GFP_KERNEL);
if (rc) {
dev_err(&port->dev, "reading line status failed: %d\n", rc);
return rc;
}
le16_to_cpus(&status);
dev_dbg(&port->dev, "read status %04x\n", status);
*state = ((status & KL5KUSB105A_DSR) ? TIOCM_DSR : 0) |
((status & KL5KUSB105A_CTS) ? TIOCM_CTS : 0);
return 0;
}
/*
* Driver's tty interface functions
*/
static int klsi_105_port_probe(struct usb_serial_port *port)
{
struct klsi_105_private *priv;
priv = kmalloc(sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
/* set initial values for control structures */
priv->cfg.pktlen = 5;
priv->cfg.baudrate = kl5kusb105a_sio_b9600;
priv->cfg.databits = kl5kusb105a_dtb_8;
priv->cfg.unknown1 = 0;
priv->cfg.unknown2 = 1;
priv->line_state = 0;
spin_lock_init(&priv->lock);
usb_set_serial_port_data(port, priv);
return 0;
}
static void klsi_105_port_remove(struct usb_serial_port *port)
{
struct klsi_105_private *priv;
priv = usb_get_serial_port_data(port);
kfree(priv);
}
static int klsi_105_open(struct tty_struct *tty, struct usb_serial_port *port)
{
struct klsi_105_private *priv = usb_get_serial_port_data(port);
int retval = 0;
int rc;
unsigned long line_state;
struct klsi_105_port_settings cfg;
unsigned long flags;
/* Do a defined restart:
* Set up sane default baud rate and send the 'READ_ON'
* vendor command.
* FIXME: set modem line control (how?)
* Then read the modem line control and store values in
* priv->line_state.
*/
cfg.pktlen = 5;
cfg.baudrate = kl5kusb105a_sio_b9600;
cfg.databits = kl5kusb105a_dtb_8;
cfg.unknown1 = 0;
cfg.unknown2 = 1;
klsi_105_chg_port_settings(port, &cfg);
spin_lock_irqsave(&priv->lock, flags);
priv->cfg.pktlen = cfg.pktlen;
priv->cfg.baudrate = cfg.baudrate;
priv->cfg.databits = cfg.databits;
priv->cfg.unknown1 = cfg.unknown1;
priv->cfg.unknown2 = cfg.unknown2;
spin_unlock_irqrestore(&priv->lock, flags);
/* READ_ON and urb submission */
rc = usb_serial_generic_open(tty, port);
if (rc)
return rc;
rc = usb_control_msg(port->serial->dev,
usb_sndctrlpipe(port->serial->dev, 0),
KL5KUSB105A_SIO_CONFIGURE,
USB_TYPE_VENDOR|USB_DIR_OUT|USB_RECIP_INTERFACE,
KL5KUSB105A_SIO_CONFIGURE_READ_ON,
0, /* index */
NULL,
0,
KLSI_TIMEOUT);
if (rc < 0) {
dev_err(&port->dev, "Enabling read failed (error = %d)\n", rc);
retval = rc;
goto err_generic_close;
} else
dev_dbg(&port->dev, "%s - enabled reading\n", __func__);
rc = klsi_105_get_line_state(port, &line_state);
if (rc < 0) {
retval = rc;
goto err_disable_read;
}
spin_lock_irqsave(&priv->lock, flags);
priv->line_state = line_state;
spin_unlock_irqrestore(&priv->lock, flags);
dev_dbg(&port->dev, "%s - read line state 0x%lx\n", __func__,
line_state);
return 0;
err_disable_read:
usb_control_msg(port->serial->dev,
usb_sndctrlpipe(port->serial->dev, 0),
KL5KUSB105A_SIO_CONFIGURE,
USB_TYPE_VENDOR | USB_DIR_OUT,
KL5KUSB105A_SIO_CONFIGURE_READ_OFF,
0, /* index */
NULL, 0,
KLSI_TIMEOUT);
err_generic_close:
usb_serial_generic_close(port);
return retval;
}
static void klsi_105_close(struct usb_serial_port *port)
{
int rc;
/* send READ_OFF */
rc = usb_control_msg(port->serial->dev,
usb_sndctrlpipe(port->serial->dev, 0),
KL5KUSB105A_SIO_CONFIGURE,
USB_TYPE_VENDOR | USB_DIR_OUT,
KL5KUSB105A_SIO_CONFIGURE_READ_OFF,
0, /* index */
NULL, 0,
KLSI_TIMEOUT);
if (rc < 0)
dev_err(&port->dev, "failed to disable read: %d\n", rc);
/* shutdown our bulk reads and writes */
usb_serial_generic_close(port);
}
/* We need to write a complete 64-byte data block and encode the
* number actually sent in the first double-byte, LSB-order. That
* leaves at most 62 bytes of payload.
*/
#define KLSI_HDR_LEN 2
static int klsi_105_prepare_write_buffer(struct usb_serial_port *port,
void *dest, size_t size)
{
unsigned char *buf = dest;
int count;
count = kfifo_out_locked(&port->write_fifo, buf + KLSI_HDR_LEN, size,
&port->lock);
put_unaligned_le16(count, buf);
return count + KLSI_HDR_LEN;
}
/* The data received is preceded by a length double-byte in LSB-first order.
*/
static void klsi_105_process_read_urb(struct urb *urb)
{
struct usb_serial_port *port = urb->context;
unsigned char *data = urb->transfer_buffer;
unsigned len;
/* empty urbs seem to happen, we ignore them */
if (!urb->actual_length)
return;
if (urb->actual_length <= KLSI_HDR_LEN) {
dev_dbg(&port->dev, "%s - malformed packet\n", __func__);
return;
}
len = get_unaligned_le16(data);
if (len > urb->actual_length - KLSI_HDR_LEN) {
dev_dbg(&port->dev, "%s - packet length mismatch\n", __func__);
len = urb->actual_length - KLSI_HDR_LEN;
}
tty_insert_flip_string(&port->port, data + KLSI_HDR_LEN, len);
tty_flip_buffer_push(&port->port);
}
static void klsi_105_set_termios(struct tty_struct *tty,
struct usb_serial_port *port,
const struct ktermios *old_termios)
{
struct klsi_105_private *priv = usb_get_serial_port_data(port);
struct device *dev = &port->dev;
unsigned int iflag = tty->termios.c_iflag;
unsigned int old_iflag = old_termios->c_iflag;
unsigned int cflag = tty->termios.c_cflag;
unsigned int old_cflag = old_termios->c_cflag;
struct klsi_105_port_settings *cfg;
unsigned long flags;
speed_t baud;
cfg = kmalloc(sizeof(*cfg), GFP_KERNEL);
if (!cfg)
return;
/* lock while we are modifying the settings */
spin_lock_irqsave(&priv->lock, flags);
/*
* Update baud rate
*/
baud = tty_get_baud_rate(tty);
switch (baud) {
case 0: /* handled below */
break;
case 1200:
priv->cfg.baudrate = kl5kusb105a_sio_b1200;
break;
case 2400:
priv->cfg.baudrate = kl5kusb105a_sio_b2400;
break;
case 4800:
priv->cfg.baudrate = kl5kusb105a_sio_b4800;
break;
case 9600:
priv->cfg.baudrate = kl5kusb105a_sio_b9600;
break;
case 19200:
priv->cfg.baudrate = kl5kusb105a_sio_b19200;
break;
case 38400:
priv->cfg.baudrate = kl5kusb105a_sio_b38400;
break;
case 57600:
priv->cfg.baudrate = kl5kusb105a_sio_b57600;
break;
case 115200:
priv->cfg.baudrate = kl5kusb105a_sio_b115200;
break;
default:
dev_dbg(dev, "unsupported baudrate, using 9600\n");
priv->cfg.baudrate = kl5kusb105a_sio_b9600;
baud = 9600;
break;
}
/*
* FIXME: implement B0 handling
*
* Maybe this should be simulated by sending read disable and read
* enable messages?
*/
tty_encode_baud_rate(tty, baud, baud);
if ((cflag & CSIZE) != (old_cflag & CSIZE)) {
/* set the number of data bits */
switch (cflag & CSIZE) {
case CS5:
dev_dbg(dev, "%s - 5 bits/byte not supported\n", __func__);
spin_unlock_irqrestore(&priv->lock, flags);
goto err;
case CS6:
dev_dbg(dev, "%s - 6 bits/byte not supported\n", __func__);
spin_unlock_irqrestore(&priv->lock, flags);
goto err;
case CS7:
priv->cfg.databits = kl5kusb105a_dtb_7;
break;
case CS8:
priv->cfg.databits = kl5kusb105a_dtb_8;
break;
default:
dev_err(dev, "CSIZE was not CS5-CS8, using default of 8\n");
priv->cfg.databits = kl5kusb105a_dtb_8;
break;
}
}
/*
* Update line control register (LCR)
*/
if ((cflag & (PARENB|PARODD)) != (old_cflag & (PARENB|PARODD))
|| (cflag & CSTOPB) != (old_cflag & CSTOPB)) {
/* Not currently supported */
tty->termios.c_cflag &= ~(PARENB|PARODD|CSTOPB);
}
/*
* Set flow control: well, I do not really now how to handle DTR/RTS.
* Just do what we have seen with SniffUSB on Win98.
*/
if ((iflag & IXOFF) != (old_iflag & IXOFF)
|| (iflag & IXON) != (old_iflag & IXON)
|| (cflag & CRTSCTS) != (old_cflag & CRTSCTS)) {
/* Not currently supported */
tty->termios.c_cflag &= ~CRTSCTS;
}
memcpy(cfg, &priv->cfg, sizeof(*cfg));
spin_unlock_irqrestore(&priv->lock, flags);
/* now commit changes to device */
klsi_105_chg_port_settings(port, cfg);
err:
kfree(cfg);
}
static int klsi_105_tiocmget(struct tty_struct *tty)
{
struct usb_serial_port *port = tty->driver_data;
struct klsi_105_private *priv = usb_get_serial_port_data(port);
unsigned long flags;
int rc;
unsigned long line_state;
rc = klsi_105_get_line_state(port, &line_state);
if (rc < 0) {
dev_err(&port->dev,
"Reading line control failed (error = %d)\n", rc);
/* better return value? EAGAIN? */
return rc;
}
spin_lock_irqsave(&priv->lock, flags);
priv->line_state = line_state;
spin_unlock_irqrestore(&priv->lock, flags);
dev_dbg(&port->dev, "%s - read line state 0x%lx\n", __func__, line_state);
return (int)line_state;
}
module_usb_serial_driver(serial_drivers, id_table);
MODULE_AUTHOR(DRIVER_AUTHOR);
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL");
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