USB: Driver for CH341 USB-serial adaptor
This patch implements a USB serial port driver for the Winchiphead CH341 USB-RS232 Converter. This chip also implements an IEEE 1284 parallel port, I2C and SPI, but that is not supported by the driver. Signed-off-by: Frank A Kingswood <frank@kingswood-consulting.co.uk> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Frank A Kingswood
Greg Kroah-Hartman
parent
4ac0718e83
commit
6ce7610478
4 changed files with 374 additions and 0 deletions
|
|
@ -428,6 +428,17 @@ Options supported:
|
|||
See http://www.uuhaus.de/linux/palmconnect.html for up-to-date
|
||||
information on this driver.
|
||||
|
||||
Winchiphead CH341 Driver
|
||||
|
||||
This driver is for the Winchiphead CH341 USB-RS232 Converter. This chip
|
||||
also implements an IEEE 1284 parallel port, I2C and SPI, but that is not
|
||||
supported by the driver. The protocol was analyzed from the behaviour
|
||||
of the Windows driver, no datasheet is available at present.
|
||||
The manufacturer's website: http://www.winchiphead.com/.
|
||||
For any questions or problems with this driver, please contact
|
||||
frank@kingswood-consulting.co.uk.
|
||||
|
||||
|
||||
Generic Serial driver
|
||||
|
||||
If your device is not one of the above listed devices, compatible with
|
||||
|
|
|
|||
|
|
@ -92,6 +92,16 @@ config USB_SERIAL_BELKIN
|
|||
To compile this driver as a module, choose M here: the
|
||||
module will be called belkin_sa.
|
||||
|
||||
config USB_SERIAL_CH341
|
||||
tristate "USB Winchiphead CH341 Single Port Serial Driver"
|
||||
depends on USB_SERIAL
|
||||
help
|
||||
Say Y here if you want to use a Winchiphead CH341 single port
|
||||
USB to serial adapter.
|
||||
|
||||
To compile this driver as a module, choose M here: the
|
||||
module will be called ch341.
|
||||
|
||||
config USB_SERIAL_WHITEHEAT
|
||||
tristate "USB ConnectTech WhiteHEAT Serial Driver"
|
||||
depends on USB_SERIAL
|
||||
|
|
|
|||
|
|
@ -15,6 +15,7 @@ obj-$(CONFIG_USB_SERIAL_AIRCABLE) += aircable.o
|
|||
obj-$(CONFIG_USB_SERIAL_AIRPRIME) += airprime.o
|
||||
obj-$(CONFIG_USB_SERIAL_ARK3116) += ark3116.o
|
||||
obj-$(CONFIG_USB_SERIAL_BELKIN) += belkin_sa.o
|
||||
obj-$(CONFIG_USB_SERIAL_CH341) += ch341.o
|
||||
obj-$(CONFIG_USB_SERIAL_CP2101) += cp2101.o
|
||||
obj-$(CONFIG_USB_SERIAL_CYBERJACK) += cyberjack.o
|
||||
obj-$(CONFIG_USB_SERIAL_CYPRESS_M8) += cypress_m8.o
|
||||
|
|
|
|||
352
drivers/usb/serial/ch341.c
Normal file
352
drivers/usb/serial/ch341.c
Normal file
|
|
@ -0,0 +1,352 @@
|
|||
/*
|
||||
* Copyright 2007, Frank A Kingswood <frank@kingswood-consulting.co.uk>
|
||||
*
|
||||
* ch341.c implements a serial port driver for the Winchiphead CH341.
|
||||
*
|
||||
* The CH341 device can be used to implement an RS232 asynchronous
|
||||
* serial port, an IEEE-1284 parallel printer port or a memory-like
|
||||
* interface. In all cases the CH341 supports an I2C interface as well.
|
||||
* This driver only supports the asynchronous serial interface.
|
||||
*
|
||||
* 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/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>
|
||||
|
||||
#define DEFAULT_BAUD_RATE 2400
|
||||
#define DEFAULT_TIMEOUT 1000
|
||||
|
||||
static int debug;
|
||||
|
||||
static struct usb_device_id id_table [] = {
|
||||
{ USB_DEVICE(0x4348, 0x5523) },
|
||||
{ },
|
||||
};
|
||||
MODULE_DEVICE_TABLE(usb, id_table);
|
||||
|
||||
struct ch341_private {
|
||||
unsigned baud_rate;
|
||||
u8 dtr;
|
||||
u8 rts;
|
||||
};
|
||||
|
||||
static int ch341_control_out(struct usb_device *dev, u8 request,
|
||||
u16 value, u16 index)
|
||||
{
|
||||
int r;
|
||||
dbg("ch341_control_out(%02x,%02x,%04x,%04x)", USB_DIR_OUT|0x40,
|
||||
(int)request, (int)value, (int)index);
|
||||
|
||||
r = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), request,
|
||||
USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_OUT,
|
||||
value, index, NULL, 0, DEFAULT_TIMEOUT);
|
||||
|
||||
return r;
|
||||
}
|
||||
|
||||
static int ch341_control_in(struct usb_device *dev,
|
||||
u8 request, u16 value, u16 index,
|
||||
char *buf, unsigned bufsize)
|
||||
{
|
||||
int r;
|
||||
dbg("ch341_control_in(%02x,%02x,%04x,%04x,%p,%u)", USB_DIR_IN|0x40,
|
||||
(int)request, (int)value, (int)index, buf, (int)bufsize);
|
||||
|
||||
r = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), request,
|
||||
USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN,
|
||||
value, index, buf, bufsize, DEFAULT_TIMEOUT);
|
||||
return r;
|
||||
}
|
||||
|
||||
int ch341_set_baudrate(struct usb_device *dev, struct ch341_private *priv)
|
||||
{
|
||||
short a, b;
|
||||
int r;
|
||||
|
||||
dbg("ch341_set_baudrate(%d)", priv->baud_rate);
|
||||
switch (priv->baud_rate) {
|
||||
case 2400:
|
||||
a = 0xd901;
|
||||
b = 0x0038;
|
||||
break;
|
||||
case 4800:
|
||||
a = 0x6402;
|
||||
b = 0x001f;
|
||||
break;
|
||||
case 9600:
|
||||
a = 0xb202;
|
||||
b = 0x0013;
|
||||
break;
|
||||
case 19200:
|
||||
a = 0xd902;
|
||||
b = 0x000d;
|
||||
break;
|
||||
case 38400:
|
||||
a = 0x6403;
|
||||
b = 0x000a;
|
||||
break;
|
||||
case 115200:
|
||||
a = 0xcc03;
|
||||
b = 0x0008;
|
||||
break;
|
||||
default:
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
r = ch341_control_out(dev, 0x9a, 0x1312, a);
|
||||
if (!r)
|
||||
r = ch341_control_out(dev, 0x9a, 0x0f2c, b);
|
||||
|
||||
return r;
|
||||
}
|
||||
|
||||
int ch341_set_handshake(struct usb_device *dev, struct ch341_private *priv)
|
||||
{
|
||||
dbg("ch341_set_handshake(%d,%d)", priv->dtr, priv->rts);
|
||||
return ch341_control_out(dev, 0xa4,
|
||||
~((priv->dtr?1<<5:0)|(priv->rts?1<<6:0)), 0);
|
||||
}
|
||||
|
||||
int ch341_get_status(struct usb_device *dev)
|
||||
{
|
||||
char *buffer;
|
||||
int r;
|
||||
const unsigned size = 8;
|
||||
|
||||
dbg("ch341_get_status()");
|
||||
|
||||
buffer = kmalloc(size, GFP_KERNEL);
|
||||
if (!buffer)
|
||||
return -ENOMEM;
|
||||
|
||||
r = ch341_control_in(dev, 0x95, 0x0706, 0, buffer, size);
|
||||
if ( r < 0)
|
||||
goto out;
|
||||
|
||||
/* Not having the datasheet for the CH341, we ignore the bytes returned
|
||||
* from the device. Return error if the device did not respond in time.
|
||||
*/
|
||||
r = 0;
|
||||
|
||||
out: kfree(buffer);
|
||||
return r;
|
||||
}
|
||||
|
||||
/* -------------------------------------------------------------------------- */
|
||||
|
||||
int ch341_configure(struct usb_device *dev, struct ch341_private *priv)
|
||||
{
|
||||
char *buffer;
|
||||
int r;
|
||||
const unsigned size = 8;
|
||||
|
||||
dbg("ch341_configure()");
|
||||
|
||||
buffer = kmalloc(size, GFP_KERNEL);
|
||||
if (!buffer)
|
||||
return -ENOMEM;
|
||||
|
||||
/* expect two bytes 0x27 0x00 */
|
||||
r = ch341_control_in(dev, 0x5f, 0, 0, buffer, size);
|
||||
if (r < 0)
|
||||
goto out;
|
||||
|
||||
r = ch341_control_out(dev, 0xa1, 0, 0);
|
||||
if (r < 0)
|
||||
goto out;
|
||||
|
||||
r = ch341_set_baudrate(dev, priv);
|
||||
if (r < 0)
|
||||
goto out;
|
||||
|
||||
/* expect two bytes 0x56 0x00 */
|
||||
r = ch341_control_in(dev, 0x95, 0x2518, 0, buffer, size);
|
||||
if (r < 0)
|
||||
goto out;
|
||||
|
||||
r = ch341_control_out(dev, 0x9a, 0x2518, 0x0050);
|
||||
if (r < 0)
|
||||
goto out;
|
||||
|
||||
/* expect 0xff 0xee */
|
||||
r = ch341_get_status(dev);
|
||||
if (r < 0)
|
||||
goto out;
|
||||
|
||||
r = ch341_control_out(dev, 0xa1, 0x501f, 0xd90a);
|
||||
if (r < 0)
|
||||
goto out;
|
||||
|
||||
r = ch341_set_baudrate(dev, priv);
|
||||
if (r < 0)
|
||||
goto out;
|
||||
|
||||
r = ch341_set_handshake(dev, priv);
|
||||
if (r < 0)
|
||||
goto out;
|
||||
|
||||
/* expect 0x9f 0xee */
|
||||
r = ch341_get_status(dev);
|
||||
|
||||
out: kfree(buffer);
|
||||
return r;
|
||||
}
|
||||
|
||||
/* allocate private data */
|
||||
static int ch341_attach(struct usb_serial *serial)
|
||||
{
|
||||
struct ch341_private *priv;
|
||||
int r;
|
||||
|
||||
dbg("ch341_attach()");
|
||||
|
||||
/* private data */
|
||||
priv = kzalloc(sizeof(struct ch341_private), GFP_KERNEL);
|
||||
if (!priv)
|
||||
return -ENOMEM;
|
||||
|
||||
priv->baud_rate = DEFAULT_BAUD_RATE;
|
||||
priv->dtr = 1;
|
||||
priv->rts = 1;
|
||||
|
||||
r = ch341_configure(serial->dev, priv);
|
||||
if (r < 0)
|
||||
goto error;
|
||||
|
||||
usb_set_serial_port_data(serial->port[0], priv);
|
||||
return 0;
|
||||
|
||||
error: kfree(priv);
|
||||
return r;
|
||||
}
|
||||
|
||||
/* open this device, set default parameters */
|
||||
static int ch341_open(struct usb_serial_port *port, struct file *filp)
|
||||
{
|
||||
struct usb_serial *serial = port->serial;
|
||||
struct ch341_private *priv = usb_get_serial_port_data(serial->port[0]);
|
||||
int r;
|
||||
|
||||
dbg("ch341_open()");
|
||||
|
||||
priv->baud_rate = DEFAULT_BAUD_RATE;
|
||||
priv->dtr = 1;
|
||||
priv->rts = 1;
|
||||
|
||||
r = ch341_configure(serial->dev, priv);
|
||||
if (r)
|
||||
goto out;
|
||||
|
||||
r = ch341_set_handshake(serial->dev, priv);
|
||||
if (r)
|
||||
goto out;
|
||||
|
||||
r = ch341_set_baudrate(serial->dev, priv);
|
||||
if (r)
|
||||
goto out;
|
||||
|
||||
r = usb_serial_generic_open(port, filp);
|
||||
|
||||
out: return r;
|
||||
}
|
||||
|
||||
/* Old_termios contains the original termios settings and
|
||||
* tty->termios contains the new setting to be used.
|
||||
*/
|
||||
static void ch341_set_termios(struct usb_serial_port *port,
|
||||
struct ktermios *old_termios)
|
||||
{
|
||||
struct ch341_private *priv = usb_get_serial_port_data(port);
|
||||
struct tty_struct *tty = port->tty;
|
||||
unsigned baud_rate;
|
||||
|
||||
dbg("ch341_set_termios()");
|
||||
|
||||
if (!tty || !tty->termios)
|
||||
return;
|
||||
|
||||
baud_rate = tty_get_baud_rate(tty);
|
||||
|
||||
switch (baud_rate) {
|
||||
case 2400:
|
||||
case 4800:
|
||||
case 9600:
|
||||
case 19200:
|
||||
case 38400:
|
||||
case 115200:
|
||||
priv->baud_rate = baud_rate;
|
||||
break;
|
||||
default:
|
||||
dbg("Rate %d not supported, using %d",
|
||||
baud_rate, DEFAULT_BAUD_RATE);
|
||||
priv->baud_rate = DEFAULT_BAUD_RATE;
|
||||
}
|
||||
|
||||
ch341_set_baudrate(port->serial->dev, priv);
|
||||
|
||||
/* Unimplemented:
|
||||
* (cflag & CSIZE) : data bits [5, 8]
|
||||
* (cflag & PARENB) : parity {NONE, EVEN, ODD}
|
||||
* (cflag & CSTOPB) : stop bits [1, 2]
|
||||
*/
|
||||
}
|
||||
|
||||
static struct usb_driver ch341_driver = {
|
||||
.name = "ch341",
|
||||
.probe = usb_serial_probe,
|
||||
.disconnect = usb_serial_disconnect,
|
||||
.id_table = id_table,
|
||||
.no_dynamic_id = 1,
|
||||
};
|
||||
|
||||
static struct usb_serial_driver ch341_device = {
|
||||
.driver = {
|
||||
.owner = THIS_MODULE,
|
||||
.name = "ch341-uart",
|
||||
},
|
||||
.id_table = id_table,
|
||||
.usb_driver = &ch341_driver,
|
||||
.num_interrupt_in = NUM_DONT_CARE,
|
||||
.num_bulk_in = 1,
|
||||
.num_bulk_out = 1,
|
||||
.num_ports = 1,
|
||||
.open = ch341_open,
|
||||
.set_termios = ch341_set_termios,
|
||||
.attach = ch341_attach,
|
||||
};
|
||||
|
||||
static int __init ch341_init(void)
|
||||
{
|
||||
int retval;
|
||||
|
||||
retval = usb_serial_register(&ch341_device);
|
||||
if (retval)
|
||||
return retval;
|
||||
retval = usb_register(&ch341_driver);
|
||||
if (retval)
|
||||
usb_serial_deregister(&ch341_device);
|
||||
return retval;
|
||||
}
|
||||
|
||||
static void __exit ch341_exit(void)
|
||||
{
|
||||
usb_deregister(&ch341_driver);
|
||||
usb_serial_deregister(&ch341_device);
|
||||
}
|
||||
|
||||
module_init(ch341_init);
|
||||
module_exit(ch341_exit);
|
||||
MODULE_LICENSE("GPL");
|
||||
|
||||
module_param(debug, bool, S_IRUGO | S_IWUSR);
|
||||
MODULE_PARM_DESC(debug, "Debug enabled or not");
|
||||
|
||||
/* EOF ch341.c */
|
||||
Loading…
Reference in a new issue