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kernel-fxtec-pro1x/drivers/usb/serial/kl5kusb105.c
Oliver Neukum 6383251545 USB: serial: fix assumption that throttle/unthrottle cannot sleep 
many serial subdrivers are clearly written as if throttle/unthrottle
cannot sleep. This leads to unneeded atomic submissions. This
patch converts affected drivers in a way to makes very clear that
throttle/unthrottle can sleep. Thus future misdesigns can be avoided
and efficiency and reliability improved.

This removes any such assumption using GFP_KERNEL and spin_lock_irq()

Signed-off-by: Oliver Neukum <oliver@neukum.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2009-10-09 13:52:09 -07:00

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27 KiB
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/*
* KLSI KL5KUSB105 chip RS232 converter driver
*
* Copyright (C) 2001 Utz-Uwe Haus <haus@uuhaus.de>
*
* 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.
*
* 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
*/
/* History:
* 0.3a - implemented pools of write URBs
* 0.3 - alpha version for public testing
* 0.2 - TIOCMGET works, so autopilot(1) can be used!
* 0.1 - can be used to do pilot-xfer -p /dev/ttyUSB0 -l
*
* The driver skeleton is mainly based on mct_u232.c and various other
* pieces of code shamelessly copied from the drivers/usb/serial/ directory.
*/
#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/uaccess.h>
#include <asm/unaligned.h>
#include <linux/usb.h>
#include <linux/usb/serial.h>
#include "kl5kusb105.h"
static int debug;
/*
* Version Information
*/
#define DRIVER_VERSION "v0.3a"
#define DRIVER_AUTHOR "Utz-Uwe Haus <haus@uuhaus.de>"
#define DRIVER_DESC "KLSI KL5KUSB105 chipset USB->Serial Converter driver"
/*
* Function prototypes
*/
static int klsi_105_startup(struct usb_serial *serial);
static void klsi_105_disconnect(struct usb_serial *serial);
static void klsi_105_release(struct usb_serial *serial);
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 int klsi_105_write(struct tty_struct *tty,
struct usb_serial_port *port, const unsigned char *buf, int count);
static void klsi_105_write_bulk_callback(struct urb *urb);
static int klsi_105_chars_in_buffer(struct tty_struct *tty);
static int klsi_105_write_room(struct tty_struct *tty);
static void klsi_105_read_bulk_callback(struct urb *urb);
static void klsi_105_set_termios(struct tty_struct *tty,
struct usb_serial_port *port, struct ktermios *old);
static void klsi_105_throttle(struct tty_struct *tty);
static void klsi_105_unthrottle(struct tty_struct *tty);
static int klsi_105_tiocmget(struct tty_struct *tty, struct file *file);
static int klsi_105_tiocmset(struct tty_struct *tty, struct file *file,
unsigned int set, unsigned int clear);
/*
* All of the device info needed for the KLSI converters.
*/
static struct usb_device_id id_table [] = {
{ USB_DEVICE(PALMCONNECT_VID, PALMCONNECT_PID) },
{ USB_DEVICE(KLSI_VID, KLSI_KL5KUSB105D_PID) },
{ } /* Terminating entry */
};
MODULE_DEVICE_TABLE(usb, id_table);
static struct usb_driver kl5kusb105d_driver = {
.name = "kl5kusb105d",
.probe = usb_serial_probe,
.disconnect = usb_serial_disconnect,
.id_table = id_table,
.no_dynamic_id = 1,
};
static struct usb_serial_driver kl5kusb105d_device = {
.driver = {
.owner = THIS_MODULE,
.name = "kl5kusb105d",
},
.description = "KL5KUSB105D / PalmConnect",
.usb_driver = &kl5kusb105d_driver,
.id_table = id_table,
.num_ports = 1,
.open = klsi_105_open,
.close = klsi_105_close,
.write = klsi_105_write,
.write_bulk_callback = klsi_105_write_bulk_callback,
.chars_in_buffer = klsi_105_chars_in_buffer,
.write_room = klsi_105_write_room,
.read_bulk_callback = klsi_105_read_bulk_callback,
.set_termios = klsi_105_set_termios,
/*.break_ctl = klsi_105_break_ctl,*/
.tiocmget = klsi_105_tiocmget,
.tiocmset = klsi_105_tiocmset,
.attach = klsi_105_startup,
.disconnect = klsi_105_disconnect,
.release = klsi_105_release,
.throttle = klsi_105_throttle,
.unthrottle = klsi_105_unthrottle,
};
struct klsi_105_port_settings {
__u8 pktlen; /* always 5, it seems */
__u8 baudrate;
__u8 databits;
__u8 unknown1;
__u8 unknown2;
} __attribute__ ((packed));
/* we implement a pool of NUM_URBS urbs per usb_serial */
#define NUM_URBS 1
#define URB_TRANSFER_BUFFER_SIZE 64
struct klsi_105_private {
struct klsi_105_port_settings cfg;
struct ktermios termios;
unsigned long line_state; /* modem line settings */
/* write pool */
struct urb *write_urb_pool[NUM_URBS];
spinlock_t lock;
unsigned long bytes_in;
unsigned long bytes_out;
};
/*
* 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_info(&port->serial->dev->dev,
"%d byte block, baudrate %x, databits %d, u1 %d, u2 %d\n",
settings->pktlen, settings->baudrate, settings->databits,
settings->unknown1, settings->unknown2);
return rc;
} /* klsi_105_chg_port_settings */
/* 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[KLSI_STATUSBUF_LEN] = { -1, -1};
__u16 status;
dev_info(&port->serial->dev->dev, "sending SIO Poll request\n");
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 < 0)
dev_err(&port->dev, "Reading line status failed (error = %d)\n",
rc);
else {
status = get_unaligned_le16(status_buf);
dev_info(&port->serial->dev->dev, "read status %x %x",
status_buf[0], status_buf[1]);
*line_state_p = klsi_105_status2linestate(status);
}
return rc;
}
/*
* Driver's tty interface functions
*/
static int klsi_105_startup(struct usb_serial *serial)
{
struct klsi_105_private *priv;
int i, j;
/* check if we support the product id (see keyspan.c)
* FIXME
*/
/* allocate the private data structure */
for (i = 0; i < serial->num_ports; i++) {
priv = kmalloc(sizeof(struct klsi_105_private),
GFP_KERNEL);
if (!priv) {
dbg("%skmalloc for klsi_105_private failed.", __func__);
i--;
goto err_cleanup;
}
/* 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;
priv->bytes_in = 0;
priv->bytes_out = 0;
usb_set_serial_port_data(serial->port[i], priv);
spin_lock_init(&priv->lock);
for (j = 0; j < NUM_URBS; j++) {
struct urb *urb = usb_alloc_urb(0, GFP_KERNEL);
priv->write_urb_pool[j] = urb;
if (urb == NULL) {
dev_err(&serial->dev->dev, "No more urbs???\n");
goto err_cleanup;
}
urb->transfer_buffer =
kmalloc(URB_TRANSFER_BUFFER_SIZE, GFP_KERNEL);
if (!urb->transfer_buffer) {
dev_err(&serial->dev->dev,
"%s - out of memory for urb buffers.\n",
__func__);
goto err_cleanup;
}
}
/* priv->termios is left uninitalized until port opening */
init_waitqueue_head(&serial->port[i]->write_wait);
}
return 0;
err_cleanup:
for (; i >= 0; i--) {
priv = usb_get_serial_port_data(serial->port[i]);
for (j = 0; j < NUM_URBS; j++) {
if (priv->write_urb_pool[j]) {
kfree(priv->write_urb_pool[j]->transfer_buffer);
usb_free_urb(priv->write_urb_pool[j]);
}
}
usb_set_serial_port_data(serial->port[i], NULL);
}
return -ENOMEM;
} /* klsi_105_startup */
static void klsi_105_disconnect(struct usb_serial *serial)
{
int i;
dbg("%s", __func__);
/* stop reads and writes on all ports */
for (i = 0; i < serial->num_ports; ++i) {
struct klsi_105_private *priv =
usb_get_serial_port_data(serial->port[i]);
if (priv) {
/* kill our write urb pool */
int j;
struct urb **write_urbs = priv->write_urb_pool;
for (j = 0; j < NUM_URBS; j++) {
if (write_urbs[j]) {
usb_kill_urb(write_urbs[j]);
usb_free_urb(write_urbs[j]);
}
}
}
}
} /* klsi_105_disconnect */
static void klsi_105_release(struct usb_serial *serial)
{
int i;
dbg("%s", __func__);
for (i = 0; i < serial->num_ports; ++i) {
struct klsi_105_private *priv =
usb_get_serial_port_data(serial->port[i]);
kfree(priv);
}
} /* klsi_105_release */
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;
int i;
unsigned long line_state;
struct klsi_105_port_settings cfg;
unsigned long flags;
dbg("%s port %d", __func__, port->number);
/* 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);
/* set up termios structure */
spin_lock_irqsave(&priv->lock, flags);
priv->termios.c_iflag = tty->termios->c_iflag;
priv->termios.c_oflag = tty->termios->c_oflag;
priv->termios.c_cflag = tty->termios->c_cflag;
priv->termios.c_lflag = tty->termios->c_lflag;
for (i = 0; i < NCCS; i++)
priv->termios.c_cc[i] = tty->termios->c_cc[i];
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 */
usb_fill_bulk_urb(port->read_urb, port->serial->dev,
usb_rcvbulkpipe(port->serial->dev,
port->bulk_in_endpointAddress),
port->read_urb->transfer_buffer,
port->read_urb->transfer_buffer_length,
klsi_105_read_bulk_callback,
port);
rc = usb_submit_urb(port->read_urb, GFP_KERNEL);
if (rc) {
dev_err(&port->dev, "%s - failed submitting read urb, "
"error %d\n", __func__, rc);
retval = rc;
goto exit;
}
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;
} else
dbg("%s - enabled reading", __func__);
rc = klsi_105_get_line_state(port, &line_state);
if (rc >= 0) {
spin_lock_irqsave(&priv->lock, flags);
priv->line_state = line_state;
spin_unlock_irqrestore(&priv->lock, flags);
dbg("%s - read line state 0x%lx", __func__, line_state);
retval = 0;
} else
retval = rc;
exit:
return retval;
} /* klsi_105_open */
static void klsi_105_close(struct usb_serial_port *port)
{
struct klsi_105_private *priv = usb_get_serial_port_data(port);
int rc;
dbg("%s port %d", __func__, port->number);
mutex_lock(&port->serial->disc_mutex);
if (!port->serial->disconnected) {
/* 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,
"Disabling read failed (error = %d)\n", rc);
}
mutex_unlock(&port->serial->disc_mutex);
/* shutdown our bulk reads and writes */
usb_kill_urb(port->write_urb);
usb_kill_urb(port->read_urb);
/* unlink our write pool */
/* FIXME */
/* wgg - do I need this? I think so. */
usb_kill_urb(port->interrupt_in_urb);
dev_info(&port->serial->dev->dev,
"port stats: %ld bytes in, %ld bytes out\n",
priv->bytes_in, priv->bytes_out);
} /* klsi_105_close */
/* 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_105_DATA_OFFSET 2 /* in the bulk urb data block */
static int klsi_105_write(struct tty_struct *tty,
struct usb_serial_port *port, const unsigned char *buf, int count)
{
struct klsi_105_private *priv = usb_get_serial_port_data(port);
int result, size;
int bytes_sent = 0;
dbg("%s - port %d", __func__, port->number);
while (count > 0) {
/* try to find a free urb (write 0 bytes if none) */
struct urb *urb = NULL;
unsigned long flags;
int i;
/* since the pool is per-port we might not need
the spin lock !? */
spin_lock_irqsave(&priv->lock, flags);
for (i = 0; i < NUM_URBS; i++) {
if (priv->write_urb_pool[i]->status != -EINPROGRESS) {
urb = priv->write_urb_pool[i];
dbg("%s - using pool URB %d", __func__, i);
break;
}
}
spin_unlock_irqrestore(&priv->lock, flags);
if (urb == NULL) {
dbg("%s - no more free urbs", __func__);
goto exit;
}
if (urb->transfer_buffer == NULL) {
urb->transfer_buffer =
kmalloc(URB_TRANSFER_BUFFER_SIZE, GFP_ATOMIC);
if (urb->transfer_buffer == NULL) {
dev_err(&port->dev,
"%s - no more kernel memory...\n",
__func__);
goto exit;
}
}
size = min(count, port->bulk_out_size - KLSI_105_DATA_OFFSET);
size = min(size, URB_TRANSFER_BUFFER_SIZE -
KLSI_105_DATA_OFFSET);
memcpy(urb->transfer_buffer + KLSI_105_DATA_OFFSET, buf, size);
/* write payload size into transfer buffer */
((__u8 *)urb->transfer_buffer)[0] = (__u8) (size & 0xFF);
((__u8 *)urb->transfer_buffer)[1] = (__u8) ((size & 0xFF00)>>8);
/* set up our urb */
usb_fill_bulk_urb(urb, port->serial->dev,
usb_sndbulkpipe(port->serial->dev,
port->bulk_out_endpointAddress),
urb->transfer_buffer,
URB_TRANSFER_BUFFER_SIZE,
klsi_105_write_bulk_callback,
port);
/* send the data out the bulk port */
result = usb_submit_urb(urb, GFP_ATOMIC);
if (result) {
dev_err(&port->dev,
"%s - failed submitting write urb, error %d\n",
__func__, result);
goto exit;
}
buf += size;
bytes_sent += size;
count -= size;
}
exit:
/* lockless, but it's for debug info only... */
priv->bytes_out += bytes_sent;
return bytes_sent; /* that's how much we wrote */
} /* klsi_105_write */
static void klsi_105_write_bulk_callback(struct urb *urb)
{
struct usb_serial_port *port = urb->context;
int status = urb->status;
dbg("%s - port %d", __func__, port->number);
if (status) {
dbg("%s - nonzero write bulk status received: %d", __func__,
status);
return;
}
usb_serial_port_softint(port);
} /* klsi_105_write_bulk_completion_callback */
/* return number of characters currently in the writing process */
static int klsi_105_chars_in_buffer(struct tty_struct *tty)
{
struct usb_serial_port *port = tty->driver_data;
int chars = 0;
int i;
unsigned long flags;
struct klsi_105_private *priv = usb_get_serial_port_data(port);
spin_lock_irqsave(&priv->lock, flags);
for (i = 0; i < NUM_URBS; ++i) {
if (priv->write_urb_pool[i]->status == -EINPROGRESS)
chars += URB_TRANSFER_BUFFER_SIZE;
}
spin_unlock_irqrestore(&priv->lock, flags);
dbg("%s - returns %d", __func__, chars);
return chars;
}
static int klsi_105_write_room(struct tty_struct *tty)
{
struct usb_serial_port *port = tty->driver_data;
unsigned long flags;
int i;
int room = 0;
struct klsi_105_private *priv = usb_get_serial_port_data(port);
spin_lock_irqsave(&priv->lock, flags);
for (i = 0; i < NUM_URBS; ++i) {
if (priv->write_urb_pool[i]->status != -EINPROGRESS)
room += URB_TRANSFER_BUFFER_SIZE;
}
spin_unlock_irqrestore(&priv->lock, flags);
dbg("%s - returns %d", __func__, room);
return room;
}
static void klsi_105_read_bulk_callback(struct urb *urb)
{
struct usb_serial_port *port = urb->context;
struct klsi_105_private *priv = usb_get_serial_port_data(port);
struct tty_struct *tty;
unsigned char *data = urb->transfer_buffer;
int rc;
int status = urb->status;
dbg("%s - port %d", __func__, port->number);
/* The urb might have been killed. */
if (status) {
dbg("%s - nonzero read bulk status received: %d", __func__,
status);
return;
}
/* The data received is again preceded by a length double-byte in LSB-
* first order (see klsi_105_write() )
*/
if (urb->actual_length == 0) {
/* empty urbs seem to happen, we ignore them */
/* dbg("%s - emtpy URB", __func__); */
;
} else if (urb->actual_length <= 2) {
dbg("%s - size %d URB not understood", __func__,
urb->actual_length);
usb_serial_debug_data(debug, &port->dev, __func__,
urb->actual_length, data);
} else {
int bytes_sent = ((__u8 *) data)[0] +
((unsigned int) ((__u8 *) data)[1] << 8);
tty = tty_port_tty_get(&port->port);
/* we should immediately resubmit the URB, before attempting
* to pass the data on to the tty layer. But that needs locking
* against re-entry an then mixed-up data because of
* intermixed tty_flip_buffer_push()s
* FIXME
*/
usb_serial_debug_data(debug, &port->dev, __func__,
urb->actual_length, data);
if (bytes_sent + 2 > urb->actual_length) {
dbg("%s - trying to read more data than available"
" (%d vs. %d)", __func__,
bytes_sent+2, urb->actual_length);
/* cap at implied limit */
bytes_sent = urb->actual_length - 2;
}
tty_buffer_request_room(tty, bytes_sent);
tty_insert_flip_string(tty, data + 2, bytes_sent);
tty_flip_buffer_push(tty);
tty_kref_put(tty);
/* again lockless, but debug info only */
priv->bytes_in += bytes_sent;
}
/* Continue trying to always read */
usb_fill_bulk_urb(port->read_urb, port->serial->dev,
usb_rcvbulkpipe(port->serial->dev,
port->bulk_in_endpointAddress),
port->read_urb->transfer_buffer,
port->read_urb->transfer_buffer_length,
klsi_105_read_bulk_callback,
port);
rc = usb_submit_urb(port->read_urb, GFP_ATOMIC);
if (rc)
dev_err(&port->dev,
"%s - failed resubmitting read urb, error %d\n",
__func__, rc);
} /* klsi_105_read_bulk_callback */
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);
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;
/* lock while we are modifying the settings */
spin_lock_irqsave(&priv->lock, flags);
/*
* Update baud rate
*/
baud = tty_get_baud_rate(tty);
if ((cflag & CBAUD) != (old_cflag & CBAUD)) {
/* reassert DTR and (maybe) RTS on transition from B0 */
if ((old_cflag & CBAUD) == B0) {
dbg("%s: baud was B0", __func__);
#if 0
priv->control_state |= TIOCM_DTR;
/* don't set RTS if using hardware flow control */
if (!(old_cflag & CRTSCTS))
priv->control_state |= TIOCM_RTS;
mct_u232_set_modem_ctrl(serial, priv->control_state);
#endif
}
}
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:
dbg("KLSI USB->Serial converter:"
" unsupported baudrate request, using default of 9600");
priv->cfg.baudrate = kl5kusb105a_sio_b9600;
baud = 9600;
break;
}
if ((cflag & CBAUD) == B0) {
dbg("%s: baud is B0", __func__);
/* Drop RTS and DTR */
/* maybe this should be simulated by sending read
* disable and read enable messages?
*/
;
#if 0
priv->control_state &= ~(TIOCM_DTR | TIOCM_RTS);
mct_u232_set_modem_ctrl(serial, priv->control_state);
#endif
}
tty_encode_baud_rate(tty, baud, baud);
if ((cflag & CSIZE) != (old_cflag & CSIZE)) {
/* set the number of data bits */
switch (cflag & CSIZE) {
case CS5:
dbg("%s - 5 bits/byte not supported", __func__);
spin_unlock_irqrestore(&priv->lock, flags);
return ;
case CS6:
dbg("%s - 6 bits/byte not supported", __func__);
spin_unlock_irqrestore(&priv->lock, flags);
return ;
case CS7:
priv->cfg.databits = kl5kusb105a_dtb_7;
break;
case CS8:
priv->cfg.databits = kl5kusb105a_dtb_8;
break;
default:
dev_err(&port->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);
#if 0
priv->last_lcr = 0;
/* set the parity */
if (cflag & PARENB)
priv->last_lcr |= (cflag & PARODD) ?
MCT_U232_PARITY_ODD : MCT_U232_PARITY_EVEN;
else
priv->last_lcr |= MCT_U232_PARITY_NONE;
/* set the number of stop bits */
priv->last_lcr |= (cflag & CSTOPB) ?
MCT_U232_STOP_BITS_2 : MCT_U232_STOP_BITS_1;
mct_u232_set_line_ctrl(serial, priv->last_lcr);
#endif
;
}
/*
* 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;
/* Drop DTR/RTS if no flow control otherwise assert */
#if 0
if ((iflag & IXOFF) || (iflag & IXON) || (cflag & CRTSCTS))
priv->control_state |= TIOCM_DTR | TIOCM_RTS;
else
priv->control_state &= ~(TIOCM_DTR | TIOCM_RTS);
mct_u232_set_modem_ctrl(serial, priv->control_state);
#endif
;
}
memcpy(&cfg, &priv->cfg, sizeof(cfg));
spin_unlock_irqrestore(&priv->lock, flags);
/* now commit changes to device */
klsi_105_chg_port_settings(port, &cfg);
} /* klsi_105_set_termios */
#if 0
static void mct_u232_break_ctl(struct tty_struct *tty, int break_state)
{
struct usb_serial_port *port = tty->driver_data;
struct usb_serial *serial = port->serial;
struct mct_u232_private *priv =
(struct mct_u232_private *)port->private;
unsigned char lcr = priv->last_lcr;
dbg("%sstate=%d", __func__, break_state);
/* LOCKING */
if (break_state)
lcr |= MCT_U232_SET_BREAK;
mct_u232_set_line_ctrl(serial, lcr);
} /* mct_u232_break_ctl */
#endif
static int klsi_105_tiocmget(struct tty_struct *tty, struct file *file)
{
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;
dbg("%s - request, just guessing", __func__);
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);
dbg("%s - read line state 0x%lx", __func__, line_state);
return (int)line_state;
}
static int klsi_105_tiocmset(struct tty_struct *tty, struct file *file,
unsigned int set, unsigned int clear)
{
int retval = -EINVAL;
dbg("%s", __func__);
/* if this ever gets implemented, it should be done something like this:
struct usb_serial *serial = port->serial;
struct klsi_105_private *priv = usb_get_serial_port_data(port);
unsigned long flags;
int control;
spin_lock_irqsave (&priv->lock, flags);
if (set & TIOCM_RTS)
priv->control_state |= TIOCM_RTS;
if (set & TIOCM_DTR)
priv->control_state |= TIOCM_DTR;
if (clear & TIOCM_RTS)
priv->control_state &= ~TIOCM_RTS;
if (clear & TIOCM_DTR)
priv->control_state &= ~TIOCM_DTR;
control = priv->control_state;
spin_unlock_irqrestore (&priv->lock, flags);
retval = mct_u232_set_modem_ctrl(serial, control);
*/
return retval;
}
static void klsi_105_throttle(struct tty_struct *tty)
{
struct usb_serial_port *port = tty->driver_data;
dbg("%s - port %d", __func__, port->number);
usb_kill_urb(port->read_urb);
}
static void klsi_105_unthrottle(struct tty_struct *tty)
{
struct usb_serial_port *port = tty->driver_data;
int result;
dbg("%s - port %d", __func__, port->number);
port->read_urb->dev = port->serial->dev;
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);
}
static int __init klsi_105_init(void)
{
int retval;
retval = usb_serial_register(&kl5kusb105d_device);
if (retval)
goto failed_usb_serial_register;
retval = usb_register(&kl5kusb105d_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(&kl5kusb105d_device);
failed_usb_serial_register:
return retval;
}
static void __exit klsi_105_exit(void)
{
usb_deregister(&kl5kusb105d_driver);
usb_serial_deregister(&kl5kusb105d_device);
}
module_init(klsi_105_init);
module_exit(klsi_105_exit);
MODULE_AUTHOR(DRIVER_AUTHOR);
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL");
module_param(debug, bool, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(debug, "enable extensive debugging messages");
/* vim: set sts=8 ts=8 sw=8: */
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