mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-09-05 02:19:51 +00:00
![Uwe Kleine-König](/assets/img/avatar_default.png)
All usb_serial drivers return 0 in their remove callbacks and driver core ignores the value returned by usb_serial_device_remove(). So change the remove callback to return void and return 0 unconditionally in usb_serial_device_remove(). Signed-off-by: Uwe Kleine-König <uwe@kleine-koenig.org> Link: https://lore.kernel.org/r/20210208143149.963644-2-uwe@kleine-koenig.org Signed-off-by: Johan Hovold <johan@kernel.org>
541 lines
14 KiB
C
541 lines
14 KiB
C
// SPDX-License-Identifier: GPL-2.0+
|
|
/*
|
|
* KLSI KL5KUSB105 chip RS232 converter driver
|
|
*
|
|
* Copyright (C) 2010 Johan Hovold <jhovold@gmail.com>
|
|
* Copyright (C) 2001 Utz-Uwe Haus <haus@uuhaus.de>
|
|
*
|
|
* 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 <asm/unaligned.h>
|
|
#include <linux/usb.h>
|
|
#include <linux/usb/serial.h>
|
|
#include "kl5kusb105.h"
|
|
|
|
#define DRIVER_AUTHOR "Utz-Uwe Haus <haus@uuhaus.de>, Johan Hovold <jhovold@gmail.com>"
|
|
#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, struct ktermios *old);
|
|
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 = {
|
|
.owner = THIS_MODULE,
|
|
.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(port->serial->dev,
|
|
usb_sndctrlpipe(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);
|
|
if (rc < 0)
|
|
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;
|
|
}
|
|
|
|
/* translate a 16-bit status value from the device to linux's TIO bits */
|
|
static unsigned long klsi_105_status2linestate(const __u16 status)
|
|
{
|
|
unsigned long res = 0;
|
|
|
|
res = ((status & KL5KUSB105A_DSR) ? TIOCM_DSR : 0)
|
|
| ((status & KL5KUSB105A_CTS) ? TIOCM_CTS : 0)
|
|
;
|
|
|
|
return res;
|
|
}
|
|
|
|
/*
|
|
* Read line control via vendor command and return result through
|
|
* *line_state_p
|
|
*/
|
|
/* It seems that the status buffer has always only 2 bytes length */
|
|
#define KLSI_STATUSBUF_LEN 2
|
|
static int klsi_105_get_line_state(struct usb_serial_port *port,
|
|
unsigned long *line_state_p)
|
|
{
|
|
int rc;
|
|
u8 *status_buf;
|
|
__u16 status;
|
|
|
|
status_buf = kmalloc(KLSI_STATUSBUF_LEN, GFP_KERNEL);
|
|
if (!status_buf)
|
|
return -ENOMEM;
|
|
|
|
status_buf[0] = 0xff;
|
|
status_buf[1] = 0xff;
|
|
rc = usb_control_msg(port->serial->dev,
|
|
usb_rcvctrlpipe(port->serial->dev, 0),
|
|
KL5KUSB105A_SIO_POLL,
|
|
USB_TYPE_VENDOR | USB_DIR_IN,
|
|
0, /* value */
|
|
0, /* index */
|
|
status_buf, KLSI_STATUSBUF_LEN,
|
|
10000
|
|
);
|
|
if (rc != KLSI_STATUSBUF_LEN) {
|
|
dev_err(&port->dev, "reading line status failed: %d\n", rc);
|
|
if (rc >= 0)
|
|
rc = -EIO;
|
|
} else {
|
|
status = get_unaligned_le16(status_buf);
|
|
|
|
dev_dbg(&port->dev, "read status %02x %02x\n",
|
|
status_buf[0], status_buf[1]);
|
|
|
|
*line_state_p = klsi_105_status2linestate(status);
|
|
}
|
|
|
|
kfree(status_buf);
|
|
return rc;
|
|
}
|
|
|
|
|
|
/*
|
|
* 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 = kmalloc(sizeof(*cfg), GFP_KERNEL);
|
|
if (!cfg)
|
|
return -ENOMEM;
|
|
|
|
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);
|
|
|
|
kfree(cfg);
|
|
|
|
/* 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,
|
|
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");
|