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linux/drivers/usb/serial/cp2101.c

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/*
* Silicon Laboratories CP2101/CP2102 USB to RS232 serial adaptor driver
*
* Copyright (C) 2005 Craig Shelley (craig@microtron.org.uk)
*
* 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.
*
*/
#include <linux/config.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/slab.h>
#include <linux/tty.h>
#include <linux/tty_flip.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/usb.h>
#include <asm/uaccess.h>
#include "usb-serial.h"
/*
* Version Information
*/
#define DRIVER_VERSION "v0.03"
#define DRIVER_DESC "Silicon Labs CP2101/CP2102 RS232 serial adaptor driver"
/*
* Function Prototypes
*/
static int cp2101_open(struct usb_serial_port*, struct file*);
static void cp2101_cleanup(struct usb_serial_port*);
static void cp2101_close(struct usb_serial_port*, struct file*);
static void cp2101_get_termios(struct usb_serial_port*);
static void cp2101_set_termios(struct usb_serial_port*, struct termios*);
static void cp2101_break_ctl(struct usb_serial_port*, int);
static int cp2101_startup (struct usb_serial *);
static void cp2101_shutdown(struct usb_serial*);
static int debug;
static struct usb_device_id id_table [] = {
{USB_DEVICE(0x10c4, 0xea60) }, /*Silicon labs factory default*/
{USB_DEVICE(0x10ab, 0x10c5) }, /*Siemens MC60 Cable*/
{ } /* Terminating Entry*/
};
MODULE_DEVICE_TABLE (usb, id_table);
static struct usb_driver cp2101_driver = {
.owner = THIS_MODULE,
.name = "CP2101",
.probe = usb_serial_probe,
.disconnect = usb_serial_disconnect,
.id_table = id_table,
};
static struct usb_serial_device_type cp2101_device = {
.owner = THIS_MODULE,
.name = "CP2101",
.id_table = id_table,
.num_interrupt_in = 0,
.num_bulk_in = 0,
.num_bulk_out = 0,
.num_ports = 1,
.open = cp2101_open,
.close = cp2101_close,
.break_ctl = cp2101_break_ctl,
.set_termios = cp2101_set_termios,
.attach = cp2101_startup,
.shutdown = cp2101_shutdown,
};
/*Config request types*/
#define REQTYPE_HOST_TO_DEVICE 0x41
#define REQTYPE_DEVICE_TO_HOST 0xc1
/*Config SET requests. To GET, add 1 to the request number*/
#define CP2101_UART 0x00 /*Enable / Disable*/
#define CP2101_BAUDRATE 0x01 /*(BAUD_RATE_GEN_FREQ / baudrate)*/
#define CP2101_BITS 0x03 /*0x(0)(data bits)(parity)(stop bits)*/
#define CP2101_BREAK 0x05 /*On / Off*/
#define CP2101_DTRRTS 0x07 /*101 / 202 ???*/
#define CP2101_CONFIG_16 0x13 /*16 bytes of config data ???*/
#define CP2101_CONFIG_6 0x19 /*6 bytes of config data ???*/
/*CP2101_UART*/
#define UART_ENABLE 0x0001
#define UART_DISABLE 0x0000
/*CP2101_BAUDRATE*/
#define BAUD_RATE_GEN_FREQ 0x384000
/*CP2101_BITS*/
#define BITS_DATA_MASK 0X0f00
#define BITS_DATA_6 0X0600
#define BITS_DATA_7 0X0700
#define BITS_DATA_8 0X0800
#define BITS_DATA_9 0X0900
#define BITS_PARITY_MASK 0x00f0
#define BITS_PARITY_NONE 0x0000
#define BITS_PARITY_ODD 0x0010
#define BITS_PARITY_EVEN 0x0020
#define BITS_PARITY_MARK 0x0030
#define BITS_PARITY_SPACE 0x0040
#define BITS_STOP_MASK 0x000f
#define BITS_STOP_1 0x0000
#define BITS_STOP_1_5 0x0001
#define BITS_STOP_2 0x0002
#define BREAK_ON 0x0000
#define BREAK_OFF 0x0001
static int cp2101_get_config(struct usb_serial_port* port, u8 request)
{
struct usb_serial *serial = port->serial;
unsigned char buf[4];
unsigned int value;
int result, i;
/*For get requests, the request number must be incremented*/
request++;
/*Issue the request, attempting to read 4 bytes*/
result = usb_control_msg (serial->dev,usb_rcvctrlpipe (serial->dev, 0),
request, REQTYPE_DEVICE_TO_HOST, 0x0000,
0, buf, 4, 300);
if (result < 0) {
dev_err(&port->dev, "%s - Unable to send config request, "
"request=0x%x result=%d\n",
__FUNCTION__, request, result);
return result;
}
/*Assemble each byte read into an integer value*/
value = 0;
for (i=0; i<4 && i<result; i++)
value |= (buf[i] << (i * 8));
dbg( " %s - request=0x%x result=%d value=0x%x",
__FUNCTION__, request, result, value);
return value;
}
static int cp2101_set_config(struct usb_serial_port* port, u8 request, u16 value)
{
struct usb_serial *serial = port->serial;
int result;
result = usb_control_msg (serial->dev, usb_sndctrlpipe(serial->dev, 0),
request, REQTYPE_HOST_TO_DEVICE, value,
0, NULL, 0, 300);
if (result <0) {
dev_err(&port->dev, "%s - Unable to send config request, "
"request=0x%x value=0x%x result=%d\n",
__FUNCTION__, request, value, result);
return result;
}
dbg(" %s - request=0x%x value=0x%x result=%d",
__FUNCTION__, request, value, result);
return 0;
}
static int cp2101_open (struct usb_serial_port *port, struct file *filp)
{
struct usb_serial *serial = port->serial;
int result;
dbg("%s - port %d", __FUNCTION__, port->number);
if (cp2101_set_config(port, CP2101_UART, UART_ENABLE)) {
dev_err(&port->dev, "%s - Unable to enable UART\n",
__FUNCTION__);
return -EPROTO;
}
/* 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,
serial->type->read_bulk_callback,
port);
result = usb_submit_urb(port->read_urb, GFP_KERNEL);
if (result) {
dev_err(&port->dev, "%s - failed resubmitting read urb, "
"error %d\n", __FUNCTION__, result);
return result;
}
/*Configure the termios structure*/
cp2101_get_termios(port);
return 0;
}
static void cp2101_cleanup (struct usb_serial_port *port)
{
struct usb_serial *serial = port->serial;
dbg("%s - port %d", __FUNCTION__, port->number);
if (serial->dev) {
/* shutdown any bulk reads that might be going on */
if (serial->num_bulk_out)
usb_kill_urb(port->write_urb);
if (serial->num_bulk_in)
usb_kill_urb(port->read_urb);
}
}
static void cp2101_close (struct usb_serial_port *port, struct file * filp)
{
dbg("%s - port %d", __FUNCTION__, port->number);
/* shutdown our urbs */
dbg("%s - shutting down urbs", __FUNCTION__);
usb_kill_urb(port->write_urb);
usb_kill_urb(port->read_urb);
cp2101_set_config(port, CP2101_UART, UART_DISABLE);
}
/* cp2101_get_termios*/
/* Reads the baud rate, data bits, parity and stop bits from the device*/
/* Corrects any unsupported values*/
/* Configures the termios structure to reflect the state of the device*/
static void cp2101_get_termios (struct usb_serial_port *port)
{
unsigned int cflag;
int baud;
int bits;
dbg("%s - port %d", __FUNCTION__, port->number);
if ((!port->tty) || (!port->tty->termios)) {
dbg("%s - no tty structures", __FUNCTION__);
return;
}
cflag = port->tty->termios->c_cflag;
baud = cp2101_get_config(port, CP2101_BAUDRATE);
/*Convert to baudrate*/
if (baud)
baud = BAUD_RATE_GEN_FREQ / baud;
dbg("%s - baud rate = %d", __FUNCTION__, baud);
cflag &= ~CBAUD;
switch (baud) {
/* The baud rates which are commented out below
* appear to be supported by the device
* but are non-standard
*/
case 600: cflag |= B600; break;
case 1200: cflag |= B1200; break;
case 1800: cflag |= B1800; break;
case 2400: cflag |= B2400; break;
case 4800: cflag |= B4800; break;
/*case 7200: cflag |= B7200; break;*/
case 9600: cflag |= B9600; break;
/*case 14400: cflag |= B14400; break;*/
case 19200: cflag |= B19200; break;
/*case 28800: cflag |= B28800; break;*/
case 38400: cflag |= B38400; break;
/*case 55854: cflag |= B55054; break;*/
case 57600: cflag |= B57600; break;
case 115200: cflag |= B115200; break;
/*case 127117: cflag |= B127117; break;*/
case 230400: cflag |= B230400; break;
case 460800: cflag |= B460800; break;
case 921600: cflag |= B921600; break;
/*case 3686400: cflag |= B3686400; break;*/
default:
dbg("%s - Baud rate is not supported, "
"using 9600 baud", __FUNCTION__);
cflag |= B9600;
cp2101_set_config(port, CP2101_BAUDRATE,
(BAUD_RATE_GEN_FREQ/9600));
break;
}
bits = cp2101_get_config(port, CP2101_BITS);
cflag &= ~CSIZE;
switch(bits & BITS_DATA_MASK) {
case BITS_DATA_6:
dbg("%s - data bits = 6", __FUNCTION__);
cflag |= CS6;
break;
case BITS_DATA_7:
dbg("%s - data bits = 7", __FUNCTION__);
cflag |= CS7;
break;
case BITS_DATA_8:
dbg("%s - data bits = 8", __FUNCTION__);
cflag |= CS8;
break;
case BITS_DATA_9:
dbg("%s - data bits = 9 (not supported, "
"using 8 data bits)", __FUNCTION__);
cflag |= CS8;
bits &= ~BITS_DATA_MASK;
bits |= BITS_DATA_8;
cp2101_set_config(port, CP2101_BITS, bits);
break;
default:
dbg("%s - Unknown number of data bits, "
"using 8", __FUNCTION__);
cflag |= CS8;
bits &= ~BITS_DATA_MASK;
bits |= BITS_DATA_8;
cp2101_set_config(port, CP2101_BITS, bits);
break;
}
switch(bits & BITS_PARITY_MASK) {
case BITS_PARITY_NONE:
dbg("%s - parity = NONE", __FUNCTION__);
cflag &= ~PARENB;
break;
case BITS_PARITY_ODD:
dbg("%s - parity = ODD", __FUNCTION__);
cflag |= (PARENB|PARODD);
break;
case BITS_PARITY_EVEN:
dbg("%s - parity = EVEN", __FUNCTION__);
cflag &= ~PARODD;
cflag |= PARENB;
break;
case BITS_PARITY_MARK:
dbg("%s - parity = MARK (not supported, "
"disabling parity)", __FUNCTION__);
cflag &= ~PARENB;
bits &= ~BITS_PARITY_MASK;
cp2101_set_config(port, CP2101_BITS, bits);
break;
case BITS_PARITY_SPACE:
dbg("%s - parity = SPACE (not supported, "
"disabling parity)", __FUNCTION__);
cflag &= ~PARENB;
bits &= ~BITS_PARITY_MASK;
cp2101_set_config(port, CP2101_BITS, bits);
break;
default:
dbg("%s - Unknown parity mode, "
"disabling parity", __FUNCTION__);
cflag &= ~PARENB;
bits &= ~BITS_PARITY_MASK;
cp2101_set_config(port, CP2101_BITS, bits);
break;
}
cflag &= ~CSTOPB;
switch(bits & BITS_STOP_MASK) {
case BITS_STOP_1:
dbg("%s - stop bits = 1", __FUNCTION__);
break;
case BITS_STOP_1_5:
dbg("%s - stop bits = 1.5 (not supported, "
"using 1 stop bit", __FUNCTION__);
bits &= ~BITS_STOP_MASK;
cp2101_set_config(port, CP2101_BITS, bits);
break;
case BITS_STOP_2:
dbg("%s - stop bits = 2", __FUNCTION__);
cflag |= CSTOPB;
break;
default:
dbg("%s - Unknown number of stop bits, "
"using 1 stop bit", __FUNCTION__);
bits &= ~BITS_STOP_MASK;
cp2101_set_config(port, CP2101_BITS, bits);
break;
}
port->tty->termios->c_cflag = cflag;
}
static void cp2101_set_termios (struct usb_serial_port *port,
struct termios *old_termios)
{
unsigned int cflag, old_cflag=0;
int baud=0;
int bits;
dbg("%s - port %d", __FUNCTION__, port->number);
if ((!port->tty) || (!port->tty->termios)) {
dbg("%s - no tty structures", __FUNCTION__);
return;
}
cflag = port->tty->termios->c_cflag;
/* check that they really want us to change something */
if (old_termios) {
if ((cflag == old_termios->c_cflag) &&
(RELEVANT_IFLAG(port->tty->termios->c_iflag)
== RELEVANT_IFLAG(old_termios->c_iflag))) {
dbg("%s - nothing to change...", __FUNCTION__);
return;
}
old_cflag = old_termios->c_cflag;
}
/* If the baud rate is to be updated*/
if ((cflag & CBAUD) != (old_cflag & CBAUD)) {
switch (cflag & CBAUD) {
/* The baud rates which are commented out below
* appear to be supported by the device
* but are non-standard
*/
case B0: baud = 0; break;
case B600: baud = 600; break;
case B1200: baud = 1200; break;
case B1800: baud = 1800; break;
case B2400: baud = 2400; break;
case B4800: baud = 4800; break;
/*case B7200: baud = 7200; break;*/
case B9600: baud = 9600; break;
/*ase B14400: baud = 14400; break;*/
case B19200: baud = 19200; break;
/*case B28800: baud = 28800; break;*/
case B38400: baud = 38400; break;
/*case B55854: baud = 55054; break;*/
case B57600: baud = 57600; break;
case B115200: baud = 115200; break;
/*case B127117: baud = 127117; break;*/
case B230400: baud = 230400; break;
case B460800: baud = 460800; break;
case B921600: baud = 921600; break;
/*case B3686400: baud = 3686400; break;*/
default:
dev_err(&port->dev, "cp2101 driver does not "
"support the baudrate requested\n");
break;
}
if (baud) {
dbg("%s - Setting baud rate to %d baud", __FUNCTION__,
baud);
if (cp2101_set_config(port, CP2101_BAUDRATE,
(BAUD_RATE_GEN_FREQ / baud)))
dev_err(&port->dev, "Baud rate requested not "
"supported by device\n");
}
}
/*If the number of data bits is to be updated*/
if ((cflag & CSIZE) != (old_cflag & CSIZE)) {
bits = cp2101_get_config(port, CP2101_BITS);
bits &= ~BITS_DATA_MASK;
switch (cflag & CSIZE) {
case CS6:
bits |= BITS_DATA_6;
dbg("%s - data bits = 6", __FUNCTION__);
break;
case CS7:
bits |= BITS_DATA_7;
dbg("%s - data bits = 7", __FUNCTION__);
break;
case CS8:
bits |= BITS_DATA_8;
dbg("%s - data bits = 8", __FUNCTION__);
break;
/*case CS9:
bits |= BITS_DATA_9;
dbg("%s - data bits = 9", __FUNCTION__);
break;*/
default:
dev_err(&port->dev, "cp2101 driver does not "
"support the number of bits requested,"
" using 8 bit mode\n");
bits |= BITS_DATA_8;
break;
}
if (cp2101_set_config(port, CP2101_BITS, bits))
dev_err(&port->dev, "Number of data bits requested "
"not supported by device\n");
}
if ((cflag & (PARENB|PARODD)) != (old_cflag & (PARENB|PARODD))) {
bits = cp2101_get_config(port, CP2101_BITS);
bits &= ~BITS_PARITY_MASK;
if (cflag & PARENB) {
if (cflag & PARODD) {
bits |= BITS_PARITY_ODD;
dbg("%s - parity = ODD", __FUNCTION__);
} else {
bits |= BITS_PARITY_EVEN;
dbg("%s - parity = EVEN", __FUNCTION__);
}
}
if (cp2101_set_config(port, CP2101_BITS, bits))
dev_err(&port->dev, "Parity mode not supported "
"by device\n");
}
if ((cflag & CSTOPB) != (old_cflag & CSTOPB)) {
bits = cp2101_get_config(port, CP2101_BITS);
bits &= ~BITS_STOP_MASK;
if (cflag & CSTOPB) {
bits |= BITS_STOP_2;
dbg("%s - stop bits = 2", __FUNCTION__);
} else {
bits |= BITS_STOP_1;
dbg("%s - stop bits = 1", __FUNCTION__);
}
if (cp2101_set_config(port, CP2101_BITS, bits))
dev_err(&port->dev, "Number of stop bits requested "
"not supported by device\n");
}
}
static void cp2101_break_ctl (struct usb_serial_port *port, int break_state)
{
u16 state;
dbg("%s - port %d", __FUNCTION__, port->number);
if (break_state == 0)
state = BREAK_OFF;
else
state = BREAK_ON;
dbg("%s - turning break %s", __FUNCTION__,
state==BREAK_OFF ? "off" : "on");
cp2101_set_config(port, CP2101_BREAK, state);
}
static int cp2101_startup (struct usb_serial *serial)
{
/*CP2101 buffers behave strangely unless device is reset*/
usb_reset_device(serial->dev);
return 0;
}
static void cp2101_shutdown (struct usb_serial *serial)
{
int i;
dbg("%s", __FUNCTION__);
/* stop reads and writes on all ports */
for (i=0; i < serial->num_ports; ++i) {
cp2101_cleanup(serial->port[i]);
}
}
static int __init cp2101_init (void)
{
int retval;
retval = usb_serial_register(&cp2101_device);
if (retval)
return retval; /*Failed to register*/
retval = usb_register(&cp2101_driver);
if (retval) {
/*Failed to register*/
usb_serial_deregister(&cp2101_device);
return retval;
}
/*Success*/
info(DRIVER_DESC " " DRIVER_VERSION);
return 0;
}
static void __exit cp2101_exit (void)
{
usb_deregister (&cp2101_driver);
usb_serial_deregister (&cp2101_device);
}
module_init(cp2101_init);
module_exit(cp2101_exit);
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_VERSION(DRIVER_VERSION);
MODULE_LICENSE("GPL");
module_param(debug, bool, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(debug, "Enable verbose debugging messages");
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