![Johan Hovold](/assets/img/avatar_default.png)
Some CH340 devices appear unable to change the initial LCR settings, so set a sane 8N1 default during probe to enable basic support for such devices. Also drop a redundant LCR read during device initialisation. Signed-off-by: Johan Hovold <johan@kernel.org>
648 lines
16 KiB
C
648 lines
16 KiB
C
/*
|
|
* 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.
|
|
*
|
|
* 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/tty.h>
|
|
#include <linux/module.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/usb.h>
|
|
#include <linux/usb/serial.h>
|
|
#include <linux/serial.h>
|
|
#include <asm/unaligned.h>
|
|
|
|
#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
|
|
|
|
/* Break support - the information used to implement this was gleaned from
|
|
* the Net/FreeBSD uchcom.c driver by Takanori Watanabe. Domo arigato.
|
|
*/
|
|
|
|
#define CH341_REQ_READ_VERSION 0x5F
|
|
#define CH341_REQ_WRITE_REG 0x9A
|
|
#define CH341_REQ_READ_REG 0x95
|
|
#define CH341_REQ_SERIAL_INIT 0xA1
|
|
#define CH341_REQ_MODEM_CTRL 0xA4
|
|
|
|
#define CH341_REG_BREAK 0x05
|
|
#define CH341_REG_LCR 0x18
|
|
#define CH341_NBREAK_BITS 0x01
|
|
|
|
#define CH341_LCR_ENABLE_RX 0x80
|
|
#define CH341_LCR_ENABLE_TX 0x40
|
|
#define CH341_LCR_MARK_SPACE 0x20
|
|
#define CH341_LCR_PAR_EVEN 0x10
|
|
#define CH341_LCR_ENABLE_PAR 0x08
|
|
#define CH341_LCR_STOP_BITS_2 0x04
|
|
#define CH341_LCR_CS8 0x03
|
|
#define CH341_LCR_CS7 0x02
|
|
#define CH341_LCR_CS6 0x01
|
|
#define CH341_LCR_CS5 0x00
|
|
|
|
static const struct usb_device_id id_table[] = {
|
|
{ USB_DEVICE(0x4348, 0x5523) },
|
|
{ USB_DEVICE(0x1a86, 0x7523) },
|
|
{ USB_DEVICE(0x1a86, 0x5523) },
|
|
{ },
|
|
};
|
|
MODULE_DEVICE_TABLE(usb, id_table);
|
|
|
|
struct ch341_private {
|
|
spinlock_t lock; /* access lock */
|
|
unsigned baud_rate; /* set baud rate */
|
|
u8 mcr;
|
|
u8 msr;
|
|
u8 lcr;
|
|
};
|
|
|
|
static void ch341_set_termios(struct tty_struct *tty,
|
|
struct usb_serial_port *port,
|
|
struct ktermios *old_termios);
|
|
|
|
static int ch341_control_out(struct usb_device *dev, u8 request,
|
|
u16 value, u16 index)
|
|
{
|
|
int r;
|
|
|
|
dev_dbg(&dev->dev, "%s - (%02x,%04x,%04x)\n", __func__,
|
|
request, value, 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);
|
|
if (r < 0)
|
|
dev_err(&dev->dev, "failed to send control message: %d\n", r);
|
|
|
|
return r;
|
|
}
|
|
|
|
static int ch341_control_in(struct usb_device *dev,
|
|
u8 request, u16 value, u16 index,
|
|
char *buf, unsigned bufsize)
|
|
{
|
|
int r;
|
|
|
|
dev_dbg(&dev->dev, "%s - (%02x,%04x,%04x,%u)\n", __func__,
|
|
request, value, index, 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);
|
|
if (r < bufsize) {
|
|
if (r >= 0) {
|
|
dev_err(&dev->dev,
|
|
"short control message received (%d < %u)\n",
|
|
r, bufsize);
|
|
r = -EIO;
|
|
}
|
|
|
|
dev_err(&dev->dev, "failed to receive control message: %d\n",
|
|
r);
|
|
return r;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int ch341_set_baudrate_lcr(struct usb_device *dev,
|
|
struct ch341_private *priv, u8 lcr)
|
|
{
|
|
short a;
|
|
int r;
|
|
unsigned long factor;
|
|
short divisor;
|
|
|
|
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;
|
|
|
|
/*
|
|
* CH341A buffers data until a full endpoint-size packet (32 bytes)
|
|
* has been received unless bit 7 is set.
|
|
*/
|
|
a |= BIT(7);
|
|
|
|
r = ch341_control_out(dev, CH341_REQ_WRITE_REG, 0x1312, a);
|
|
if (r)
|
|
return r;
|
|
|
|
r = ch341_control_out(dev, CH341_REQ_WRITE_REG, 0x2518, lcr);
|
|
if (r)
|
|
return r;
|
|
|
|
return r;
|
|
}
|
|
|
|
static int ch341_set_handshake(struct usb_device *dev, u8 control)
|
|
{
|
|
return ch341_control_out(dev, CH341_REQ_MODEM_CTRL, ~control, 0);
|
|
}
|
|
|
|
static int ch341_get_status(struct usb_device *dev, struct ch341_private *priv)
|
|
{
|
|
const unsigned int size = 2;
|
|
char *buffer;
|
|
int r;
|
|
unsigned long flags;
|
|
|
|
buffer = kmalloc(size, GFP_KERNEL);
|
|
if (!buffer)
|
|
return -ENOMEM;
|
|
|
|
r = ch341_control_in(dev, CH341_REQ_READ_REG, 0x0706, 0, buffer, size);
|
|
if (r < 0)
|
|
goto out;
|
|
|
|
spin_lock_irqsave(&priv->lock, flags);
|
|
priv->msr = (~(*buffer)) & CH341_BITS_MODEM_STAT;
|
|
spin_unlock_irqrestore(&priv->lock, flags);
|
|
|
|
out: kfree(buffer);
|
|
return r;
|
|
}
|
|
|
|
/* -------------------------------------------------------------------------- */
|
|
|
|
static int ch341_configure(struct usb_device *dev, struct ch341_private *priv)
|
|
{
|
|
const unsigned int size = 2;
|
|
char *buffer;
|
|
int r;
|
|
|
|
buffer = kmalloc(size, GFP_KERNEL);
|
|
if (!buffer)
|
|
return -ENOMEM;
|
|
|
|
/* expect two bytes 0x27 0x00 */
|
|
r = ch341_control_in(dev, CH341_REQ_READ_VERSION, 0, 0, buffer, size);
|
|
if (r < 0)
|
|
goto out;
|
|
dev_dbg(&dev->dev, "Chip version: 0x%02x\n", buffer[0]);
|
|
|
|
r = ch341_control_out(dev, CH341_REQ_SERIAL_INIT, 0, 0);
|
|
if (r < 0)
|
|
goto out;
|
|
|
|
r = ch341_set_baudrate_lcr(dev, priv, priv->lcr);
|
|
if (r < 0)
|
|
goto out;
|
|
|
|
r = ch341_set_handshake(dev, priv->mcr);
|
|
|
|
out: kfree(buffer);
|
|
return r;
|
|
}
|
|
|
|
static int ch341_port_probe(struct usb_serial_port *port)
|
|
{
|
|
struct ch341_private *priv;
|
|
int r;
|
|
|
|
priv = kzalloc(sizeof(struct ch341_private), GFP_KERNEL);
|
|
if (!priv)
|
|
return -ENOMEM;
|
|
|
|
spin_lock_init(&priv->lock);
|
|
priv->baud_rate = DEFAULT_BAUD_RATE;
|
|
/*
|
|
* Some CH340 devices appear unable to change the initial LCR
|
|
* settings, so set a sane 8N1 default.
|
|
*/
|
|
priv->lcr = CH341_LCR_ENABLE_RX | CH341_LCR_ENABLE_TX | CH341_LCR_CS8;
|
|
|
|
r = ch341_configure(port->serial->dev, priv);
|
|
if (r < 0)
|
|
goto error;
|
|
|
|
usb_set_serial_port_data(port, priv);
|
|
return 0;
|
|
|
|
error: kfree(priv);
|
|
return r;
|
|
}
|
|
|
|
static int ch341_port_remove(struct usb_serial_port *port)
|
|
{
|
|
struct ch341_private *priv;
|
|
|
|
priv = usb_get_serial_port_data(port);
|
|
kfree(priv);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int ch341_carrier_raised(struct usb_serial_port *port)
|
|
{
|
|
struct ch341_private *priv = usb_get_serial_port_data(port);
|
|
if (priv->msr & CH341_BIT_DCD)
|
|
return 1;
|
|
return 0;
|
|
}
|
|
|
|
static void ch341_dtr_rts(struct usb_serial_port *port, int on)
|
|
{
|
|
struct ch341_private *priv = usb_get_serial_port_data(port);
|
|
unsigned long flags;
|
|
|
|
/* drop DTR and RTS */
|
|
spin_lock_irqsave(&priv->lock, flags);
|
|
if (on)
|
|
priv->mcr |= CH341_BIT_RTS | CH341_BIT_DTR;
|
|
else
|
|
priv->mcr &= ~(CH341_BIT_RTS | CH341_BIT_DTR);
|
|
spin_unlock_irqrestore(&priv->lock, flags);
|
|
ch341_set_handshake(port->serial->dev, priv->mcr);
|
|
}
|
|
|
|
static void ch341_close(struct usb_serial_port *port)
|
|
{
|
|
usb_serial_generic_close(port);
|
|
usb_kill_urb(port->interrupt_in_urb);
|
|
}
|
|
|
|
|
|
/* open this device, set default parameters */
|
|
static int ch341_open(struct tty_struct *tty, struct usb_serial_port *port)
|
|
{
|
|
struct ch341_private *priv = usb_get_serial_port_data(port);
|
|
int r;
|
|
|
|
if (tty)
|
|
ch341_set_termios(tty, port, NULL);
|
|
|
|
dev_dbg(&port->dev, "%s - submitting interrupt urb\n", __func__);
|
|
r = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
|
|
if (r) {
|
|
dev_err(&port->dev, "%s - failed to submit interrupt urb: %d\n",
|
|
__func__, r);
|
|
return r;
|
|
}
|
|
|
|
r = ch341_get_status(port->serial->dev, priv);
|
|
if (r < 0) {
|
|
dev_err(&port->dev, "failed to read modem status: %d\n", r);
|
|
goto err_kill_interrupt_urb;
|
|
}
|
|
|
|
r = usb_serial_generic_open(tty, port);
|
|
if (r)
|
|
goto err_kill_interrupt_urb;
|
|
|
|
return 0;
|
|
|
|
err_kill_interrupt_urb:
|
|
usb_kill_urb(port->interrupt_in_urb);
|
|
|
|
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 tty_struct *tty,
|
|
struct usb_serial_port *port, struct ktermios *old_termios)
|
|
{
|
|
struct ch341_private *priv = usb_get_serial_port_data(port);
|
|
unsigned baud_rate;
|
|
unsigned long flags;
|
|
u8 lcr;
|
|
int r;
|
|
|
|
/* redundant changes may cause the chip to lose bytes */
|
|
if (old_termios && !tty_termios_hw_change(&tty->termios, old_termios))
|
|
return;
|
|
|
|
baud_rate = tty_get_baud_rate(tty);
|
|
|
|
lcr = CH341_LCR_ENABLE_RX | CH341_LCR_ENABLE_TX;
|
|
|
|
switch (C_CSIZE(tty)) {
|
|
case CS5:
|
|
lcr |= CH341_LCR_CS5;
|
|
break;
|
|
case CS6:
|
|
lcr |= CH341_LCR_CS6;
|
|
break;
|
|
case CS7:
|
|
lcr |= CH341_LCR_CS7;
|
|
break;
|
|
case CS8:
|
|
lcr |= CH341_LCR_CS8;
|
|
break;
|
|
}
|
|
|
|
if (C_PARENB(tty)) {
|
|
lcr |= CH341_LCR_ENABLE_PAR;
|
|
if (C_PARODD(tty) == 0)
|
|
lcr |= CH341_LCR_PAR_EVEN;
|
|
if (C_CMSPAR(tty))
|
|
lcr |= CH341_LCR_MARK_SPACE;
|
|
}
|
|
|
|
if (C_CSTOPB(tty))
|
|
lcr |= CH341_LCR_STOP_BITS_2;
|
|
|
|
if (baud_rate) {
|
|
priv->baud_rate = baud_rate;
|
|
|
|
r = ch341_set_baudrate_lcr(port->serial->dev, priv, lcr);
|
|
if (r < 0 && old_termios) {
|
|
priv->baud_rate = tty_termios_baud_rate(old_termios);
|
|
tty_termios_copy_hw(&tty->termios, old_termios);
|
|
} else if (r == 0) {
|
|
priv->lcr = lcr;
|
|
}
|
|
}
|
|
|
|
spin_lock_irqsave(&priv->lock, flags);
|
|
if (C_BAUD(tty) == B0)
|
|
priv->mcr &= ~(CH341_BIT_DTR | CH341_BIT_RTS);
|
|
else if (old_termios && (old_termios->c_cflag & CBAUD) == B0)
|
|
priv->mcr |= (CH341_BIT_DTR | CH341_BIT_RTS);
|
|
spin_unlock_irqrestore(&priv->lock, flags);
|
|
|
|
ch341_set_handshake(port->serial->dev, priv->mcr);
|
|
}
|
|
|
|
static void ch341_break_ctl(struct tty_struct *tty, int break_state)
|
|
{
|
|
const uint16_t ch341_break_reg =
|
|
((uint16_t) CH341_REG_LCR << 8) | CH341_REG_BREAK;
|
|
struct usb_serial_port *port = tty->driver_data;
|
|
int r;
|
|
uint16_t reg_contents;
|
|
uint8_t *break_reg;
|
|
|
|
break_reg = kmalloc(2, GFP_KERNEL);
|
|
if (!break_reg)
|
|
return;
|
|
|
|
r = ch341_control_in(port->serial->dev, CH341_REQ_READ_REG,
|
|
ch341_break_reg, 0, break_reg, 2);
|
|
if (r < 0) {
|
|
dev_err(&port->dev, "%s - USB control read error (%d)\n",
|
|
__func__, r);
|
|
goto out;
|
|
}
|
|
dev_dbg(&port->dev, "%s - initial ch341 break register contents - reg1: %x, reg2: %x\n",
|
|
__func__, break_reg[0], break_reg[1]);
|
|
if (break_state != 0) {
|
|
dev_dbg(&port->dev, "%s - Enter break state requested\n", __func__);
|
|
break_reg[0] &= ~CH341_NBREAK_BITS;
|
|
break_reg[1] &= ~CH341_LCR_ENABLE_TX;
|
|
} else {
|
|
dev_dbg(&port->dev, "%s - Leave break state requested\n", __func__);
|
|
break_reg[0] |= CH341_NBREAK_BITS;
|
|
break_reg[1] |= CH341_LCR_ENABLE_TX;
|
|
}
|
|
dev_dbg(&port->dev, "%s - New ch341 break register contents - reg1: %x, reg2: %x\n",
|
|
__func__, break_reg[0], break_reg[1]);
|
|
reg_contents = get_unaligned_le16(break_reg);
|
|
r = ch341_control_out(port->serial->dev, CH341_REQ_WRITE_REG,
|
|
ch341_break_reg, reg_contents);
|
|
if (r < 0)
|
|
dev_err(&port->dev, "%s - USB control write error (%d)\n",
|
|
__func__, r);
|
|
out:
|
|
kfree(break_reg);
|
|
}
|
|
|
|
static int ch341_tiocmset(struct tty_struct *tty,
|
|
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->mcr |= CH341_BIT_RTS;
|
|
if (set & TIOCM_DTR)
|
|
priv->mcr |= CH341_BIT_DTR;
|
|
if (clear & TIOCM_RTS)
|
|
priv->mcr &= ~CH341_BIT_RTS;
|
|
if (clear & TIOCM_DTR)
|
|
priv->mcr &= ~CH341_BIT_DTR;
|
|
control = priv->mcr;
|
|
spin_unlock_irqrestore(&priv->lock, flags);
|
|
|
|
return ch341_set_handshake(port->serial->dev, control);
|
|
}
|
|
|
|
static void ch341_update_status(struct usb_serial_port *port,
|
|
unsigned char *data, size_t len)
|
|
{
|
|
struct ch341_private *priv = usb_get_serial_port_data(port);
|
|
struct tty_struct *tty;
|
|
unsigned long flags;
|
|
u8 status;
|
|
u8 delta;
|
|
|
|
if (len < 4)
|
|
return;
|
|
|
|
status = ~data[2] & CH341_BITS_MODEM_STAT;
|
|
|
|
spin_lock_irqsave(&priv->lock, flags);
|
|
delta = status ^ priv->msr;
|
|
priv->msr = status;
|
|
spin_unlock_irqrestore(&priv->lock, flags);
|
|
|
|
if (data[1] & CH341_MULT_STAT)
|
|
dev_dbg(&port->dev, "%s - multiple status change\n", __func__);
|
|
|
|
if (!delta)
|
|
return;
|
|
|
|
if (delta & CH341_BIT_CTS)
|
|
port->icount.cts++;
|
|
if (delta & CH341_BIT_DSR)
|
|
port->icount.dsr++;
|
|
if (delta & CH341_BIT_RI)
|
|
port->icount.rng++;
|
|
if (delta & CH341_BIT_DCD) {
|
|
port->icount.dcd++;
|
|
tty = tty_port_tty_get(&port->port);
|
|
if (tty) {
|
|
usb_serial_handle_dcd_change(port, tty,
|
|
status & CH341_BIT_DCD);
|
|
tty_kref_put(tty);
|
|
}
|
|
}
|
|
|
|
wake_up_interruptible(&port->port.delta_msr_wait);
|
|
}
|
|
|
|
static void ch341_read_int_callback(struct urb *urb)
|
|
{
|
|
struct usb_serial_port *port = urb->context;
|
|
unsigned char *data = urb->transfer_buffer;
|
|
unsigned int len = urb->actual_length;
|
|
int status;
|
|
|
|
switch (urb->status) {
|
|
case 0:
|
|
/* success */
|
|
break;
|
|
case -ECONNRESET:
|
|
case -ENOENT:
|
|
case -ESHUTDOWN:
|
|
/* this urb is terminated, clean up */
|
|
dev_dbg(&urb->dev->dev, "%s - urb shutting down: %d\n",
|
|
__func__, urb->status);
|
|
return;
|
|
default:
|
|
dev_dbg(&urb->dev->dev, "%s - nonzero urb status: %d\n",
|
|
__func__, urb->status);
|
|
goto exit;
|
|
}
|
|
|
|
usb_serial_debug_data(&port->dev, __func__, len, data);
|
|
ch341_update_status(port, data, len);
|
|
exit:
|
|
status = usb_submit_urb(urb, GFP_ATOMIC);
|
|
if (status) {
|
|
dev_err(&urb->dev->dev, "%s - usb_submit_urb failed: %d\n",
|
|
__func__, status);
|
|
}
|
|
}
|
|
|
|
static int ch341_tiocmget(struct tty_struct *tty)
|
|
{
|
|
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;
|
|
|
|
spin_lock_irqsave(&priv->lock, flags);
|
|
mcr = priv->mcr;
|
|
status = priv->msr;
|
|
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);
|
|
|
|
dev_dbg(&port->dev, "%s - result = %x\n", __func__, result);
|
|
|
|
return result;
|
|
}
|
|
|
|
static int ch341_reset_resume(struct usb_serial *serial)
|
|
{
|
|
struct usb_serial_port *port = serial->port[0];
|
|
struct ch341_private *priv = usb_get_serial_port_data(port);
|
|
int ret;
|
|
|
|
/* reconfigure ch341 serial port after bus-reset */
|
|
ch341_configure(serial->dev, priv);
|
|
|
|
if (tty_port_initialized(&port->port)) {
|
|
ret = usb_submit_urb(port->interrupt_in_urb, GFP_NOIO);
|
|
if (ret) {
|
|
dev_err(&port->dev, "failed to submit interrupt urb: %d\n",
|
|
ret);
|
|
return ret;
|
|
}
|
|
|
|
ret = ch341_get_status(port->serial->dev, priv);
|
|
if (ret < 0) {
|
|
dev_err(&port->dev, "failed to read modem status: %d\n",
|
|
ret);
|
|
}
|
|
}
|
|
|
|
return usb_serial_generic_resume(serial);
|
|
}
|
|
|
|
static struct usb_serial_driver ch341_device = {
|
|
.driver = {
|
|
.owner = THIS_MODULE,
|
|
.name = "ch341-uart",
|
|
},
|
|
.id_table = id_table,
|
|
.num_ports = 1,
|
|
.open = ch341_open,
|
|
.dtr_rts = ch341_dtr_rts,
|
|
.carrier_raised = ch341_carrier_raised,
|
|
.close = ch341_close,
|
|
.set_termios = ch341_set_termios,
|
|
.break_ctl = ch341_break_ctl,
|
|
.tiocmget = ch341_tiocmget,
|
|
.tiocmset = ch341_tiocmset,
|
|
.tiocmiwait = usb_serial_generic_tiocmiwait,
|
|
.read_int_callback = ch341_read_int_callback,
|
|
.port_probe = ch341_port_probe,
|
|
.port_remove = ch341_port_remove,
|
|
.reset_resume = ch341_reset_resume,
|
|
};
|
|
|
|
static struct usb_serial_driver * const serial_drivers[] = {
|
|
&ch341_device, NULL
|
|
};
|
|
|
|
module_usb_serial_driver(serial_drivers, id_table);
|
|
|
|
MODULE_LICENSE("GPL");
|