forked from Minki/linux
USB: usb-serial ch341: support for DTR/RTS/CTS
Fixup of Werner Cornelius patch to the ch341 USB-serial driver, which adds:
- support all baudrates, not just a hard-coded set
- support for controlling DTR, RTS and CTS
Features still missing:
- character length other than 8 bits
- parity settings
- break control
I adapted his patch for the new usb_serial API introduced in 2.6.25-git8 by
Alan Cox on 22 July 2008. Non-compliance to the new API was a reason for
refusing a similar patch from Tollef Fog Heen.
Usage example by Tollef Fog Heen :
TEMPer USB thermometer <http://err.no/src/TEMPer.c>
Signed-off-by: Werner Cornelius <Werner.Cornelius@cornelius-consult.de>
Signed-off-by: Boris Hajduk <boris@hajduk.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Werner Cornelius
Greg Kroah-Hartman
parent
bcbbbfc169
commit
664d5df92e
@ -1,5 +1,7 @@
|
||||
/*
|
||||
* Copyright 2007, Frank A Kingswood <frank@kingswood-consulting.co.uk>
|
||||
* Copyright 2007, Werner Cornelius <werner@cornelius-consult.de>
|
||||
* Copyright 2009, Boris Hajduk <boris@hajduk.org>
|
||||
*
|
||||
* ch341.c implements a serial port driver for the Winchiphead CH341.
|
||||
*
|
||||
@ -21,9 +23,39 @@
|
||||
#include <linux/usb/serial.h>
|
||||
#include <linux/serial.h>
|
||||
|
||||
#define DEFAULT_BAUD_RATE 2400
|
||||
#define DEFAULT_BAUD_RATE 9600
|
||||
#define DEFAULT_TIMEOUT 1000
|
||||
|
||||
/* flags for IO-Bits */
|
||||
#define CH341_BIT_RTS (1 << 6)
|
||||
#define CH341_BIT_DTR (1 << 5)
|
||||
|
||||
/******************************/
|
||||
/* interrupt pipe definitions */
|
||||
/******************************/
|
||||
/* always 4 interrupt bytes */
|
||||
/* first irq byte normally 0x08 */
|
||||
/* second irq byte base 0x7d + below */
|
||||
/* third irq byte base 0x94 + below */
|
||||
/* fourth irq byte normally 0xee */
|
||||
|
||||
/* second interrupt byte */
|
||||
#define CH341_MULT_STAT 0x04 /* multiple status since last interrupt event */
|
||||
|
||||
/* status returned in third interrupt answer byte, inverted in data
|
||||
from irq */
|
||||
#define CH341_BIT_CTS 0x01
|
||||
#define CH341_BIT_DSR 0x02
|
||||
#define CH341_BIT_RI 0x04
|
||||
#define CH341_BIT_DCD 0x08
|
||||
#define CH341_BITS_MODEM_STAT 0x0f /* all bits */
|
||||
|
||||
/*******************************/
|
||||
/* baudrate calculation factor */
|
||||
/*******************************/
|
||||
#define CH341_BAUDBASE_FACTOR 1532620800
|
||||
#define CH341_BAUDBASE_DIVMAX 3
|
||||
|
||||
static int debug;
|
||||
|
||||
static struct usb_device_id id_table [] = {
|
||||
@ -34,9 +66,12 @@ static struct usb_device_id id_table [] = {
|
||||
MODULE_DEVICE_TABLE(usb, id_table);
|
||||
|
||||
struct ch341_private {
|
||||
unsigned baud_rate;
|
||||
u8 dtr;
|
||||
u8 rts;
|
||||
spinlock_t lock; /* access lock */
|
||||
wait_queue_head_t delta_msr_wait; /* wait queue for modem status */
|
||||
unsigned baud_rate; /* set baud rate */
|
||||
u8 line_control; /* set line control value RTS/DTR */
|
||||
u8 line_status; /* active status of modem control inputs */
|
||||
u8 multi_status_change; /* status changed multiple since last call */
|
||||
};
|
||||
|
||||
static int ch341_control_out(struct usb_device *dev, u8 request,
|
||||
@ -72,37 +107,28 @@ static int ch341_set_baudrate(struct usb_device *dev,
|
||||
{
|
||||
short a, b;
|
||||
int r;
|
||||
unsigned long factor;
|
||||
short divisor;
|
||||
|
||||
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:
|
||||
|
||||
if (!priv->baud_rate)
|
||||
return -EINVAL;
|
||||
factor = (CH341_BAUDBASE_FACTOR / priv->baud_rate);
|
||||
divisor = CH341_BAUDBASE_DIVMAX;
|
||||
|
||||
while ((factor > 0xfff0) && divisor) {
|
||||
factor >>= 3;
|
||||
divisor--;
|
||||
}
|
||||
|
||||
if (factor > 0xfff0)
|
||||
return -EINVAL;
|
||||
|
||||
factor = 0x10000 - factor;
|
||||
a = (factor & 0xff00) | divisor;
|
||||
b = factor & 0xff;
|
||||
|
||||
r = ch341_control_out(dev, 0x9a, 0x1312, a);
|
||||
if (!r)
|
||||
r = ch341_control_out(dev, 0x9a, 0x0f2c, b);
|
||||
@ -110,19 +136,18 @@ static int ch341_set_baudrate(struct usb_device *dev,
|
||||
return r;
|
||||
}
|
||||
|
||||
static int ch341_set_handshake(struct usb_device *dev,
|
||||
struct ch341_private *priv)
|
||||
static int ch341_set_handshake(struct usb_device *dev, u8 control)
|
||||
{
|
||||
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);
|
||||
dbg("ch341_set_handshake(0x%02x)", control);
|
||||
return ch341_control_out(dev, 0xa4, ~control, 0);
|
||||
}
|
||||
|
||||
static int ch341_get_status(struct usb_device *dev)
|
||||
static int ch341_get_status(struct usb_device *dev, struct ch341_private *priv)
|
||||
{
|
||||
char *buffer;
|
||||
int r;
|
||||
const unsigned size = 8;
|
||||
unsigned long flags;
|
||||
|
||||
dbg("ch341_get_status()");
|
||||
|
||||
@ -134,10 +159,15 @@ static int ch341_get_status(struct usb_device *dev)
|
||||
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;
|
||||
/* setup the private status if available */
|
||||
if (r == 2) {
|
||||
r = 0;
|
||||
spin_lock_irqsave(&priv->lock, flags);
|
||||
priv->line_status = (~(*buffer)) & CH341_BITS_MODEM_STAT;
|
||||
priv->multi_status_change = 0;
|
||||
spin_unlock_irqrestore(&priv->lock, flags);
|
||||
} else
|
||||
r = -EPROTO;
|
||||
|
||||
out: kfree(buffer);
|
||||
return r;
|
||||
@ -180,7 +210,7 @@ static int ch341_configure(struct usb_device *dev, struct ch341_private *priv)
|
||||
goto out;
|
||||
|
||||
/* expect 0xff 0xee */
|
||||
r = ch341_get_status(dev);
|
||||
r = ch341_get_status(dev, priv);
|
||||
if (r < 0)
|
||||
goto out;
|
||||
|
||||
@ -192,12 +222,12 @@ static int ch341_configure(struct usb_device *dev, struct ch341_private *priv)
|
||||
if (r < 0)
|
||||
goto out;
|
||||
|
||||
r = ch341_set_handshake(dev, priv);
|
||||
r = ch341_set_handshake(dev, priv->line_control);
|
||||
if (r < 0)
|
||||
goto out;
|
||||
|
||||
/* expect 0x9f 0xee */
|
||||
r = ch341_get_status(dev);
|
||||
r = ch341_get_status(dev, priv);
|
||||
|
||||
out: kfree(buffer);
|
||||
return r;
|
||||
@ -216,9 +246,10 @@ static int ch341_attach(struct usb_serial *serial)
|
||||
if (!priv)
|
||||
return -ENOMEM;
|
||||
|
||||
spin_lock_init(&priv->lock);
|
||||
init_waitqueue_head(&priv->delta_msr_wait);
|
||||
priv->baud_rate = DEFAULT_BAUD_RATE;
|
||||
priv->dtr = 1;
|
||||
priv->rts = 1;
|
||||
priv->line_control = CH341_BIT_RTS | CH341_BIT_DTR;
|
||||
|
||||
r = ch341_configure(serial->dev, priv);
|
||||
if (r < 0)
|
||||
@ -231,6 +262,35 @@ error: kfree(priv);
|
||||
return r;
|
||||
}
|
||||
|
||||
static void ch341_close(struct tty_struct *tty, struct usb_serial_port *port,
|
||||
struct file *filp)
|
||||
{
|
||||
struct ch341_private *priv = usb_get_serial_port_data(port);
|
||||
unsigned long flags;
|
||||
unsigned int c_cflag;
|
||||
|
||||
dbg("%s - port %d", __func__, port->number);
|
||||
|
||||
/* shutdown our urbs */
|
||||
dbg("%s - shutting down urbs", __func__);
|
||||
usb_kill_urb(port->write_urb);
|
||||
usb_kill_urb(port->read_urb);
|
||||
usb_kill_urb(port->interrupt_in_urb);
|
||||
|
||||
if (tty) {
|
||||
c_cflag = tty->termios->c_cflag;
|
||||
if (c_cflag & HUPCL) {
|
||||
/* drop DTR and RTS */
|
||||
spin_lock_irqsave(&priv->lock, flags);
|
||||
priv->line_control = 0;
|
||||
spin_unlock_irqrestore(&priv->lock, flags);
|
||||
ch341_set_handshake(port->serial->dev, 0);
|
||||
}
|
||||
}
|
||||
wake_up_interruptible(&priv->delta_msr_wait);
|
||||
}
|
||||
|
||||
|
||||
/* open this device, set default parameters */
|
||||
static int ch341_open(struct tty_struct *tty, struct usb_serial_port *port,
|
||||
struct file *filp)
|
||||
@ -242,14 +302,13 @@ static int ch341_open(struct tty_struct *tty, struct usb_serial_port *port,
|
||||
dbg("ch341_open()");
|
||||
|
||||
priv->baud_rate = DEFAULT_BAUD_RATE;
|
||||
priv->dtr = 1;
|
||||
priv->rts = 1;
|
||||
priv->line_control = CH341_BIT_RTS | CH341_BIT_DTR;
|
||||
|
||||
r = ch341_configure(serial->dev, priv);
|
||||
if (r)
|
||||
goto out;
|
||||
|
||||
r = ch341_set_handshake(serial->dev, priv);
|
||||
r = ch341_set_handshake(serial->dev, priv->line_control);
|
||||
if (r)
|
||||
goto out;
|
||||
|
||||
@ -257,6 +316,16 @@ static int ch341_open(struct tty_struct *tty, struct usb_serial_port *port,
|
||||
if (r)
|
||||
goto out;
|
||||
|
||||
dbg("%s - submitting interrupt urb", __func__);
|
||||
port->interrupt_in_urb->dev = serial->dev;
|
||||
r = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
|
||||
if (r) {
|
||||
dev_err(&port->dev, "%s - failed submitting interrupt urb,"
|
||||
" error %d\n", __func__, r);
|
||||
ch341_close(tty, port, NULL);
|
||||
return -EPROTO;
|
||||
}
|
||||
|
||||
r = usb_serial_generic_open(tty, port, filp);
|
||||
|
||||
out: return r;
|
||||
@ -270,38 +339,194 @@ static void ch341_set_termios(struct tty_struct *tty,
|
||||
{
|
||||
struct ch341_private *priv = usb_get_serial_port_data(port);
|
||||
unsigned baud_rate;
|
||||
unsigned long flags;
|
||||
|
||||
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;
|
||||
priv->baud_rate = baud_rate;
|
||||
|
||||
if (baud_rate) {
|
||||
spin_lock_irqsave(&priv->lock, flags);
|
||||
priv->line_control |= (CH341_BIT_DTR | CH341_BIT_RTS);
|
||||
spin_unlock_irqrestore(&priv->lock, flags);
|
||||
ch341_set_baudrate(port->serial->dev, priv);
|
||||
} else {
|
||||
spin_lock_irqsave(&priv->lock, flags);
|
||||
priv->line_control &= ~(CH341_BIT_DTR | CH341_BIT_RTS);
|
||||
spin_unlock_irqrestore(&priv->lock, flags);
|
||||
}
|
||||
|
||||
ch341_set_baudrate(port->serial->dev, priv);
|
||||
ch341_set_handshake(port->serial->dev, priv->line_control);
|
||||
|
||||
/* Unimplemented:
|
||||
* (cflag & CSIZE) : data bits [5, 8]
|
||||
* (cflag & PARENB) : parity {NONE, EVEN, ODD}
|
||||
* (cflag & CSTOPB) : stop bits [1, 2]
|
||||
*/
|
||||
}
|
||||
|
||||
/* Copy back the old hardware settings */
|
||||
tty_termios_copy_hw(tty->termios, old_termios);
|
||||
/* And re-encode with the new baud */
|
||||
tty_encode_baud_rate(tty, baud_rate, baud_rate);
|
||||
static int ch341_tiocmset(struct tty_struct *tty, struct file *file,
|
||||
unsigned int set, unsigned int clear)
|
||||
{
|
||||
struct usb_serial_port *port = tty->driver_data;
|
||||
struct ch341_private *priv = usb_get_serial_port_data(port);
|
||||
unsigned long flags;
|
||||
u8 control;
|
||||
|
||||
spin_lock_irqsave(&priv->lock, flags);
|
||||
if (set & TIOCM_RTS)
|
||||
priv->line_control |= CH341_BIT_RTS;
|
||||
if (set & TIOCM_DTR)
|
||||
priv->line_control |= CH341_BIT_DTR;
|
||||
if (clear & TIOCM_RTS)
|
||||
priv->line_control &= ~CH341_BIT_RTS;
|
||||
if (clear & TIOCM_DTR)
|
||||
priv->line_control &= ~CH341_BIT_DTR;
|
||||
control = priv->line_control;
|
||||
spin_unlock_irqrestore(&priv->lock, flags);
|
||||
|
||||
return ch341_set_handshake(port->serial->dev, control);
|
||||
}
|
||||
|
||||
static void ch341_read_int_callback(struct urb *urb)
|
||||
{
|
||||
struct usb_serial_port *port = (struct usb_serial_port *) urb->context;
|
||||
unsigned char *data = urb->transfer_buffer;
|
||||
unsigned int actual_length = urb->actual_length;
|
||||
int status;
|
||||
|
||||
dbg("%s (%d)", __func__, port->number);
|
||||
|
||||
switch (urb->status) {
|
||||
case 0:
|
||||
/* success */
|
||||
break;
|
||||
case -ECONNRESET:
|
||||
case -ENOENT:
|
||||
case -ESHUTDOWN:
|
||||
/* this urb is terminated, clean up */
|
||||
dbg("%s - urb shutting down with status: %d", __func__,
|
||||
urb->status);
|
||||
return;
|
||||
default:
|
||||
dbg("%s - nonzero urb status received: %d", __func__,
|
||||
urb->status);
|
||||
goto exit;
|
||||
}
|
||||
|
||||
usb_serial_debug_data(debug, &port->dev, __func__,
|
||||
urb->actual_length, urb->transfer_buffer);
|
||||
|
||||
if (actual_length >= 4) {
|
||||
struct ch341_private *priv = usb_get_serial_port_data(port);
|
||||
unsigned long flags;
|
||||
|
||||
spin_lock_irqsave(&priv->lock, flags);
|
||||
priv->line_status = (~(data[2])) & CH341_BITS_MODEM_STAT;
|
||||
if ((data[1] & CH341_MULT_STAT))
|
||||
priv->multi_status_change = 1;
|
||||
spin_unlock_irqrestore(&priv->lock, flags);
|
||||
wake_up_interruptible(&priv->delta_msr_wait);
|
||||
}
|
||||
|
||||
exit:
|
||||
status = usb_submit_urb(urb, GFP_ATOMIC);
|
||||
if (status)
|
||||
dev_err(&urb->dev->dev,
|
||||
"%s - usb_submit_urb failed with result %d\n",
|
||||
__func__, status);
|
||||
}
|
||||
|
||||
static int wait_modem_info(struct usb_serial_port *port, unsigned int arg)
|
||||
{
|
||||
struct ch341_private *priv = usb_get_serial_port_data(port);
|
||||
unsigned long flags;
|
||||
u8 prevstatus;
|
||||
u8 status;
|
||||
u8 changed;
|
||||
u8 multi_change = 0;
|
||||
|
||||
spin_lock_irqsave(&priv->lock, flags);
|
||||
prevstatus = priv->line_status;
|
||||
priv->multi_status_change = 0;
|
||||
spin_unlock_irqrestore(&priv->lock, flags);
|
||||
|
||||
while (!multi_change) {
|
||||
interruptible_sleep_on(&priv->delta_msr_wait);
|
||||
/* see if a signal did it */
|
||||
if (signal_pending(current))
|
||||
return -ERESTARTSYS;
|
||||
|
||||
spin_lock_irqsave(&priv->lock, flags);
|
||||
status = priv->line_status;
|
||||
multi_change = priv->multi_status_change;
|
||||
spin_unlock_irqrestore(&priv->lock, flags);
|
||||
|
||||
changed = prevstatus ^ status;
|
||||
|
||||
if (((arg & TIOCM_RNG) && (changed & CH341_BIT_RI)) ||
|
||||
((arg & TIOCM_DSR) && (changed & CH341_BIT_DSR)) ||
|
||||
((arg & TIOCM_CD) && (changed & CH341_BIT_DCD)) ||
|
||||
((arg & TIOCM_CTS) && (changed & CH341_BIT_CTS))) {
|
||||
return 0;
|
||||
}
|
||||
prevstatus = status;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
/*static int ch341_ioctl(struct usb_serial_port *port, struct file *file,*/
|
||||
static int ch341_ioctl(struct tty_struct *tty, struct file *file,
|
||||
unsigned int cmd, unsigned long arg)
|
||||
{
|
||||
struct usb_serial_port *port = tty->driver_data;
|
||||
dbg("%s (%d) cmd = 0x%04x", __func__, port->number, cmd);
|
||||
|
||||
switch (cmd) {
|
||||
case TIOCMIWAIT:
|
||||
dbg("%s (%d) TIOCMIWAIT", __func__, port->number);
|
||||
return wait_modem_info(port, arg);
|
||||
|
||||
default:
|
||||
dbg("%s not supported = 0x%04x", __func__, cmd);
|
||||
break;
|
||||
}
|
||||
|
||||
return -ENOIOCTLCMD;
|
||||
}
|
||||
|
||||
static int ch341_tiocmget(struct tty_struct *tty, struct file *file)
|
||||
{
|
||||
struct usb_serial_port *port = tty->driver_data;
|
||||
struct ch341_private *priv = usb_get_serial_port_data(port);
|
||||
unsigned long flags;
|
||||
u8 mcr;
|
||||
u8 status;
|
||||
unsigned int result;
|
||||
|
||||
dbg("%s (%d)", __func__, port->number);
|
||||
|
||||
spin_lock_irqsave(&priv->lock, flags);
|
||||
mcr = priv->line_control;
|
||||
status = priv->line_status;
|
||||
spin_unlock_irqrestore(&priv->lock, flags);
|
||||
|
||||
result = ((mcr & CH341_BIT_DTR) ? TIOCM_DTR : 0)
|
||||
| ((mcr & CH341_BIT_RTS) ? TIOCM_RTS : 0)
|
||||
| ((status & CH341_BIT_CTS) ? TIOCM_CTS : 0)
|
||||
| ((status & CH341_BIT_DSR) ? TIOCM_DSR : 0)
|
||||
| ((status & CH341_BIT_RI) ? TIOCM_RI : 0)
|
||||
| ((status & CH341_BIT_DCD) ? TIOCM_CD : 0);
|
||||
|
||||
dbg("%s - result = %x", __func__, result);
|
||||
|
||||
return result;
|
||||
}
|
||||
|
||||
static struct usb_driver ch341_driver = {
|
||||
@ -317,12 +542,17 @@ static struct usb_serial_driver ch341_device = {
|
||||
.owner = THIS_MODULE,
|
||||
.name = "ch341-uart",
|
||||
},
|
||||
.id_table = id_table,
|
||||
.usb_driver = &ch341_driver,
|
||||
.num_ports = 1,
|
||||
.open = ch341_open,
|
||||
.set_termios = ch341_set_termios,
|
||||
.attach = ch341_attach,
|
||||
.id_table = id_table,
|
||||
.usb_driver = &ch341_driver,
|
||||
.num_ports = 1,
|
||||
.open = ch341_open,
|
||||
.close = ch341_close,
|
||||
.ioctl = ch341_ioctl,
|
||||
.set_termios = ch341_set_termios,
|
||||
.tiocmget = ch341_tiocmget,
|
||||
.tiocmset = ch341_tiocmset,
|
||||
.read_int_callback = ch341_read_int_callback,
|
||||
.attach = ch341_attach,
|
||||
};
|
||||
|
||||
static int __init ch341_init(void)
|
||||
|
||||
Loading…
Reference in New Issue
Block a user