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linux/drivers/usb/serial/quatech2.c

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// SPDX-License-Identifier: GPL-2.0
/*
* usb-serial driver for Quatech USB 2 devices
*
* Copyright (C) 2012 Bill Pemberton (wfp5p@virginia.edu)
*
* These devices all have only 1 bulk in and 1 bulk out that is shared
* for all serial ports.
*
*/
#include <asm/unaligned.h>
#include <linux/errno.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/serial.h>
#include <linux/usb.h>
#include <linux/usb/serial.h>
#include <linux/serial_reg.h>
#include <linux/uaccess.h>
/* default urb timeout for usb operations */
#define QT2_USB_TIMEOUT USB_CTRL_SET_TIMEOUT
#define QT_OPEN_CLOSE_CHANNEL 0xca
#define QT_SET_GET_DEVICE 0xc2
#define QT_SET_GET_REGISTER 0xc0
#define QT_GET_SET_PREBUF_TRIG_LVL 0xcc
#define QT_SET_ATF 0xcd
#define QT_TRANSFER_IN 0xc0
#define QT_HW_FLOW_CONTROL_MASK 0xc5
#define QT_SW_FLOW_CONTROL_MASK 0xc6
#define QT2_BREAK_CONTROL 0xc8
#define QT2_GET_SET_UART 0xc1
#define QT2_FLUSH_DEVICE 0xc4
#define QT2_GET_SET_QMCR 0xe1
#define QT2_QMCR_RS232 0x40
#define QT2_QMCR_RS422 0x10
#define SERIAL_CRTSCTS ((UART_MCR_RTS << 8) | UART_MSR_CTS)
#define SERIAL_EVEN_PARITY (UART_LCR_PARITY | UART_LCR_EPAR)
/* status bytes for the device */
#define QT2_CONTROL_BYTE 0x1b
#define QT2_LINE_STATUS 0x00 /* following 1 byte is line status */
#define QT2_MODEM_STATUS 0x01 /* following 1 byte is modem status */
#define QT2_XMIT_HOLD 0x02 /* following 2 bytes are ?? */
#define QT2_CHANGE_PORT 0x03 /* following 1 byte is port to change to */
#define QT2_REC_FLUSH 0x04 /* no following info */
#define QT2_XMIT_FLUSH 0x05 /* no following info */
#define QT2_CONTROL_ESCAPE 0xff /* pass through previous 2 control bytes */
#define MAX_BAUD_RATE 921600
#define DEFAULT_BAUD_RATE 9600
#define QT2_READ_BUFFER_SIZE 512 /* size of read buffer */
#define QT2_WRITE_BUFFER_SIZE 512 /* size of write buffer */
#define QT2_WRITE_CONTROL_SIZE 5 /* control bytes used for a write */
#define DRIVER_DESC "Quatech 2nd gen USB to Serial Driver"
#define USB_VENDOR_ID_QUATECH 0x061d
#define QUATECH_SSU2_100 0xC120 /* RS232 single port */
#define QUATECH_DSU2_100 0xC140 /* RS232 dual port */
#define QUATECH_DSU2_400 0xC150 /* RS232/422/485 dual port */
#define QUATECH_QSU2_100 0xC160 /* RS232 four port */
#define QUATECH_QSU2_400 0xC170 /* RS232/422/485 four port */
#define QUATECH_ESU2_100 0xC1A0 /* RS232 eight port */
#define QUATECH_ESU2_400 0xC180 /* RS232/422/485 eight port */
struct qt2_device_detail {
int product_id;
int num_ports;
};
#define QT_DETAILS(prod, ports) \
.product_id = (prod), \
.num_ports = (ports)
static const struct qt2_device_detail qt2_device_details[] = {
{QT_DETAILS(QUATECH_SSU2_100, 1)},
{QT_DETAILS(QUATECH_DSU2_400, 2)},
{QT_DETAILS(QUATECH_DSU2_100, 2)},
{QT_DETAILS(QUATECH_QSU2_400, 4)},
{QT_DETAILS(QUATECH_QSU2_100, 4)},
{QT_DETAILS(QUATECH_ESU2_400, 8)},
{QT_DETAILS(QUATECH_ESU2_100, 8)},
{QT_DETAILS(0, 0)} /* Terminating entry */
};
static const struct usb_device_id id_table[] = {
{USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_SSU2_100)},
{USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_DSU2_100)},
{USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_DSU2_400)},
{USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_QSU2_100)},
{USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_QSU2_400)},
{USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_ESU2_100)},
{USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_ESU2_400)},
{} /* Terminating entry */
};
MODULE_DEVICE_TABLE(usb, id_table);
struct qt2_serial_private {
unsigned char current_port; /* current port for incoming data */
struct urb *read_urb; /* shared among all ports */
char *read_buffer;
};
struct qt2_port_private {
u8 device_port;
spinlock_t urb_lock;
bool urb_in_use;
struct urb *write_urb;
char *write_buffer;
spinlock_t lock;
u8 shadowLSR;
u8 shadowMSR;
struct usb_serial_port *port;
};
static void qt2_update_lsr(struct usb_serial_port *port, unsigned char *ch);
static void qt2_update_msr(struct usb_serial_port *port, unsigned char *ch);
static void qt2_write_bulk_callback(struct urb *urb);
static void qt2_read_bulk_callback(struct urb *urb);
static void qt2_release(struct usb_serial *serial)
{
struct qt2_serial_private *serial_priv;
serial_priv = usb_get_serial_data(serial);
usb_kill_urb(serial_priv->read_urb);
usb_free_urb(serial_priv->read_urb);
kfree(serial_priv->read_buffer);
kfree(serial_priv);
}
static inline int calc_baud_divisor(int baudrate)
{
int divisor, rem;
divisor = MAX_BAUD_RATE / baudrate;
rem = MAX_BAUD_RATE % baudrate;
/* Round to nearest divisor */
if (((rem * 2) >= baudrate) && (baudrate != 110))
divisor++;
return divisor;
}
static inline int qt2_set_port_config(struct usb_device *dev,
unsigned char port_number,
u16 baudrate, u16 lcr)
{
int divisor = calc_baud_divisor(baudrate);
u16 index = ((u16) (lcr << 8) | (u16) (port_number));
return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
QT2_GET_SET_UART, 0x40,
divisor, index, NULL, 0, QT2_USB_TIMEOUT);
}
static inline int qt2_control_msg(struct usb_device *dev,
u8 request, u16 data, u16 index)
{
return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
request, 0x40, data, index,
NULL, 0, QT2_USB_TIMEOUT);
}
static inline int qt2_setdevice(struct usb_device *dev, u8 *data)
{
u16 x = ((u16) (data[1] << 8) | (u16) (data[0]));
return qt2_control_msg(dev, QT_SET_GET_DEVICE, x, 0);
}
static inline int qt2_getregister(struct usb_device *dev,
u8 uart,
u8 reg,
u8 *data)
{
int ret;
ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
QT_SET_GET_REGISTER, 0xc0, reg,
uart, data, sizeof(*data), QT2_USB_TIMEOUT);
if (ret < (int)sizeof(*data)) {
if (ret >= 0)
ret = -EIO;
}
return ret;
}
static inline int qt2_setregister(struct usb_device *dev,
u8 uart, u8 reg, u16 data)
{
u16 value = (data << 8) | reg;
return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
QT_SET_GET_REGISTER, 0x40, value, uart,
NULL, 0, QT2_USB_TIMEOUT);
}
static inline int update_mctrl(struct qt2_port_private *port_priv,
unsigned int set, unsigned int clear)
{
struct usb_serial_port *port = port_priv->port;
struct usb_device *dev = port->serial->dev;
unsigned urb_value;
int status;
if (((set | clear) & (TIOCM_DTR | TIOCM_RTS)) == 0) {
dev_dbg(&port->dev,
"update_mctrl - DTR|RTS not being set|cleared\n");
return 0; /* no change */
}
clear &= ~set; /* 'set' takes precedence over 'clear' */
urb_value = 0;
if (set & TIOCM_DTR)
urb_value |= UART_MCR_DTR;
if (set & TIOCM_RTS)
urb_value |= UART_MCR_RTS;
status = qt2_setregister(dev, port_priv->device_port, UART_MCR,
urb_value);
if (status < 0)
dev_err(&port->dev,
"update_mctrl - Error from MODEM_CTRL urb: %i\n",
status);
return status;
}
static int qt2_calc_num_ports(struct usb_serial *serial,
struct usb_serial_endpoints *epds)
{
struct qt2_device_detail d;
int i;
for (i = 0; d = qt2_device_details[i], d.product_id != 0; i++) {
if (d.product_id == le16_to_cpu(serial->dev->descriptor.idProduct))
return d.num_ports;
}
/* we didn't recognize the device */
dev_err(&serial->dev->dev,
"don't know the number of ports, assuming 1\n");
return 1;
}
static void qt2_set_termios(struct tty_struct *tty,
struct usb_serial_port *port,
struct ktermios *old_termios)
{
struct usb_device *dev = port->serial->dev;
struct qt2_port_private *port_priv;
struct ktermios *termios = &tty->termios;
u16 baud;
unsigned int cflag = termios->c_cflag;
u16 new_lcr = 0;
int status;
port_priv = usb_get_serial_port_data(port);
if (cflag & PARENB) {
if (cflag & PARODD)
new_lcr |= UART_LCR_PARITY;
else
new_lcr |= SERIAL_EVEN_PARITY;
}
switch (cflag & CSIZE) {
case CS5:
new_lcr |= UART_LCR_WLEN5;
break;
case CS6:
new_lcr |= UART_LCR_WLEN6;
break;
case CS7:
new_lcr |= UART_LCR_WLEN7;
break;
default:
case CS8:
new_lcr |= UART_LCR_WLEN8;
break;
}
baud = tty_get_baud_rate(tty);
if (!baud)
baud = 9600;
status = qt2_set_port_config(dev, port_priv->device_port, baud,
new_lcr);
if (status < 0)
dev_err(&port->dev, "%s - qt2_set_port_config failed: %i\n",
__func__, status);
if (cflag & CRTSCTS)
status = qt2_control_msg(dev, QT_HW_FLOW_CONTROL_MASK,
SERIAL_CRTSCTS,
port_priv->device_port);
else
status = qt2_control_msg(dev, QT_HW_FLOW_CONTROL_MASK,
0, port_priv->device_port);
if (status < 0)
dev_err(&port->dev, "%s - set HW flow control failed: %i\n",
__func__, status);
if (I_IXOFF(tty) || I_IXON(tty)) {
u16 x = ((u16) (START_CHAR(tty) << 8) | (u16) (STOP_CHAR(tty)));
status = qt2_control_msg(dev, QT_SW_FLOW_CONTROL_MASK,
x, port_priv->device_port);
} else
status = qt2_control_msg(dev, QT_SW_FLOW_CONTROL_MASK,
0, port_priv->device_port);
if (status < 0)
dev_err(&port->dev, "%s - set SW flow control failed: %i\n",
__func__, status);
}
static int qt2_open(struct tty_struct *tty, struct usb_serial_port *port)
{
struct usb_serial *serial;
struct qt2_port_private *port_priv;
u8 *data;
u16 device_port;
int status;
unsigned long flags;
device_port = port->port_number;
serial = port->serial;
port_priv = usb_get_serial_port_data(port);
/* set the port to RS232 mode */
status = qt2_control_msg(serial->dev, QT2_GET_SET_QMCR,
QT2_QMCR_RS232, device_port);
if (status < 0) {
dev_err(&port->dev,
"%s failed to set RS232 mode for port %i error %i\n",
__func__, device_port, status);
return status;
}
data = kzalloc(2, GFP_KERNEL);
if (!data)
return -ENOMEM;
/* open the port */
status = usb_control_msg(serial->dev,
usb_rcvctrlpipe(serial->dev, 0),
QT_OPEN_CLOSE_CHANNEL,
0xc0, 0,
device_port, data, 2, QT2_USB_TIMEOUT);
if (status < 2) {
dev_err(&port->dev, "%s - open port failed %i\n", __func__,
status);
if (status >= 0)
status = -EIO;
kfree(data);
return status;
}
spin_lock_irqsave(&port_priv->lock, flags);
port_priv->shadowLSR = data[0];
port_priv->shadowMSR = data[1];
spin_unlock_irqrestore(&port_priv->lock, flags);
kfree(data);
/* set to default speed and 8bit word size */
status = qt2_set_port_config(serial->dev, device_port,
DEFAULT_BAUD_RATE, UART_LCR_WLEN8);
if (status < 0) {
dev_err(&port->dev, "%s - initial setup failed (%i)\n",
__func__, device_port);
return status;
}
port_priv->device_port = (u8) device_port;
if (tty)
qt2_set_termios(tty, port, &tty->termios);
return 0;
}
static void qt2_close(struct usb_serial_port *port)
{
struct usb_serial *serial;
struct qt2_port_private *port_priv;
int i;
serial = port->serial;
port_priv = usb_get_serial_port_data(port);
usb_kill_urb(port_priv->write_urb);
/* flush the port transmit buffer */
i = usb_control_msg(serial->dev,
usb_rcvctrlpipe(serial->dev, 0),
QT2_FLUSH_DEVICE, 0x40, 1,
port_priv->device_port, NULL, 0, QT2_USB_TIMEOUT);
if (i < 0)
dev_err(&port->dev, "%s - transmit buffer flush failed: %i\n",
__func__, i);
/* flush the port receive buffer */
i = usb_control_msg(serial->dev,
usb_rcvctrlpipe(serial->dev, 0),
QT2_FLUSH_DEVICE, 0x40, 0,
port_priv->device_port, NULL, 0, QT2_USB_TIMEOUT);
if (i < 0)
dev_err(&port->dev, "%s - receive buffer flush failed: %i\n",
__func__, i);
/* close the port */
i = usb_control_msg(serial->dev,
usb_sndctrlpipe(serial->dev, 0),
QT_OPEN_CLOSE_CHANNEL,
0x40, 0,
port_priv->device_port, NULL, 0, QT2_USB_TIMEOUT);
if (i < 0)
dev_err(&port->dev, "%s - close port failed %i\n",
__func__, i);
}
static void qt2_disconnect(struct usb_serial *serial)
{
struct qt2_serial_private *serial_priv = usb_get_serial_data(serial);
usb_kill_urb(serial_priv->read_urb);
}
static int get_serial_info(struct tty_struct *tty,
struct serial_struct *ss)
{
struct usb_serial_port *port = tty->driver_data;
ss->line = port->minor;
ss->port = 0;
ss->irq = 0;
ss->xmit_fifo_size = port->bulk_out_size;
ss->baud_base = 9600;
ss->close_delay = 5*HZ;
ss->closing_wait = 30*HZ;
return 0;
}
static void qt2_process_status(struct usb_serial_port *port, unsigned char *ch)
{
switch (*ch) {
case QT2_LINE_STATUS:
qt2_update_lsr(port, ch + 1);
break;
case QT2_MODEM_STATUS:
qt2_update_msr(port, ch + 1);
break;
}
}
/* not needed, kept to document functionality */
static void qt2_process_xmit_empty(struct usb_serial_port *port,
unsigned char *ch)
{
int bytes_written;
bytes_written = (int)(*ch) + (int)(*(ch + 1) << 4);
}
/* not needed, kept to document functionality */
static void qt2_process_flush(struct usb_serial_port *port, unsigned char *ch)
{
return;
}
static void qt2_process_read_urb(struct urb *urb)
{
struct usb_serial *serial;
struct qt2_serial_private *serial_priv;
struct usb_serial_port *port;
bool escapeflag;
unsigned char *ch;
int i;
unsigned char newport;
int len = urb->actual_length;
if (!len)
return;
ch = urb->transfer_buffer;
serial = urb->context;
serial_priv = usb_get_serial_data(serial);
port = serial->port[serial_priv->current_port];
for (i = 0; i < urb->actual_length; i++) {
ch = (unsigned char *)urb->transfer_buffer + i;
if ((i <= (len - 3)) &&
(*ch == QT2_CONTROL_BYTE) &&
(*(ch + 1) == QT2_CONTROL_BYTE)) {
escapeflag = false;
switch (*(ch + 2)) {
case QT2_LINE_STATUS:
case QT2_MODEM_STATUS:
if (i > (len - 4)) {
dev_warn(&port->dev,
"%s - status message too short\n",
__func__);
break;
}
qt2_process_status(port, ch + 2);
i += 3;
escapeflag = true;
break;
case QT2_XMIT_HOLD:
if (i > (len - 5)) {
dev_warn(&port->dev,
"%s - xmit_empty message too short\n",
__func__);
break;
}
qt2_process_xmit_empty(port, ch + 3);
i += 4;
escapeflag = true;
break;
case QT2_CHANGE_PORT:
if (i > (len - 4)) {
dev_warn(&port->dev,
"%s - change_port message too short\n",
__func__);
break;
}
tty_flip_buffer_push(&port->port);
newport = *(ch + 3);
if (newport > serial->num_ports) {
dev_err(&port->dev,
"%s - port change to invalid port: %i\n",
__func__, newport);
break;
}
serial_priv->current_port = newport;
port = serial->port[serial_priv->current_port];
i += 3;
escapeflag = true;
break;
case QT2_REC_FLUSH:
case QT2_XMIT_FLUSH:
qt2_process_flush(port, ch + 2);
i += 2;
escapeflag = true;
break;
case QT2_CONTROL_ESCAPE:
tty_insert_flip_string(&port->port, ch, 2);
i += 2;
escapeflag = true;
break;
default:
dev_warn(&port->dev,
"%s - unsupported command %i\n",
__func__, *(ch + 2));
break;
}
if (escapeflag)
continue;
}
tty_insert_flip_char(&port->port, *ch, TTY_NORMAL);
}
tty_flip_buffer_push(&port->port);
}
static void qt2_write_bulk_callback(struct urb *urb)
{
struct usb_serial_port *port;
struct qt2_port_private *port_priv;
unsigned long flags;
port = urb->context;
port_priv = usb_get_serial_port_data(port);
spin_lock_irqsave(&port_priv->urb_lock, flags);
port_priv->urb_in_use = false;
usb_serial_port_softint(port);
spin_unlock_irqrestore(&port_priv->urb_lock, flags);
}
static void qt2_read_bulk_callback(struct urb *urb)
{
struct usb_serial *serial = urb->context;
int status;
if (urb->status) {
dev_warn(&serial->dev->dev,
"%s - non-zero urb status: %i\n", __func__,
urb->status);
return;
}
qt2_process_read_urb(urb);
status = usb_submit_urb(urb, GFP_ATOMIC);
if (status != 0)
dev_err(&serial->dev->dev,
"%s - resubmit read urb failed: %i\n",
__func__, status);
}
static int qt2_setup_urbs(struct usb_serial *serial)
{
struct usb_serial_port *port0;
struct qt2_serial_private *serial_priv;
int status;
port0 = serial->port[0];
serial_priv = usb_get_serial_data(serial);
serial_priv->read_urb = usb_alloc_urb(0, GFP_KERNEL);
if (!serial_priv->read_urb)
return -ENOMEM;
usb_fill_bulk_urb(serial_priv->read_urb, serial->dev,
usb_rcvbulkpipe(serial->dev,
port0->bulk_in_endpointAddress),
serial_priv->read_buffer,
QT2_READ_BUFFER_SIZE,
qt2_read_bulk_callback, serial);
status = usb_submit_urb(serial_priv->read_urb, GFP_KERNEL);
if (status != 0) {
dev_err(&serial->dev->dev,
"%s - submit read urb failed %i\n", __func__, status);
usb_free_urb(serial_priv->read_urb);
return status;
}
return 0;
}
static int qt2_attach(struct usb_serial *serial)
{
struct qt2_serial_private *serial_priv;
int status;
/* power on unit */
status = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
0xc2, 0x40, 0x8000, 0, NULL, 0,
QT2_USB_TIMEOUT);
if (status < 0) {
dev_err(&serial->dev->dev,
"%s - failed to power on unit: %i\n", __func__, status);
return status;
}
serial_priv = kzalloc(sizeof(*serial_priv), GFP_KERNEL);
if (!serial_priv)
return -ENOMEM;
serial_priv->read_buffer = kmalloc(QT2_READ_BUFFER_SIZE, GFP_KERNEL);
if (!serial_priv->read_buffer) {
status = -ENOMEM;
goto err_buf;
}
usb_set_serial_data(serial, serial_priv);
status = qt2_setup_urbs(serial);
if (status != 0)
goto attach_failed;
return 0;
attach_failed:
kfree(serial_priv->read_buffer);
err_buf:
kfree(serial_priv);
return status;
}
static int qt2_port_probe(struct usb_serial_port *port)
{
struct usb_serial *serial = port->serial;
struct qt2_port_private *port_priv;
u8 bEndpointAddress;
port_priv = kzalloc(sizeof(*port_priv), GFP_KERNEL);
if (!port_priv)
return -ENOMEM;
spin_lock_init(&port_priv->lock);
spin_lock_init(&port_priv->urb_lock);
port_priv->port = port;
port_priv->write_buffer = kmalloc(QT2_WRITE_BUFFER_SIZE, GFP_KERNEL);
if (!port_priv->write_buffer)
goto err_buf;
port_priv->write_urb = usb_alloc_urb(0, GFP_KERNEL);
if (!port_priv->write_urb)
goto err_urb;
bEndpointAddress = serial->port[0]->bulk_out_endpointAddress;
usb_fill_bulk_urb(port_priv->write_urb, serial->dev,
usb_sndbulkpipe(serial->dev, bEndpointAddress),
port_priv->write_buffer,
QT2_WRITE_BUFFER_SIZE,
qt2_write_bulk_callback, port);
usb_set_serial_port_data(port, port_priv);
return 0;
err_urb:
kfree(port_priv->write_buffer);
err_buf:
kfree(port_priv);
return -ENOMEM;
}
static int qt2_port_remove(struct usb_serial_port *port)
{
struct qt2_port_private *port_priv;
port_priv = usb_get_serial_port_data(port);
usb_free_urb(port_priv->write_urb);
kfree(port_priv->write_buffer);
kfree(port_priv);
return 0;
}
static int qt2_tiocmget(struct tty_struct *tty)
{
struct usb_serial_port *port = tty->driver_data;
struct usb_device *dev = port->serial->dev;
struct qt2_port_private *port_priv = usb_get_serial_port_data(port);
u8 *d;
int r;
d = kzalloc(2, GFP_KERNEL);
if (!d)
return -ENOMEM;
r = qt2_getregister(dev, port_priv->device_port, UART_MCR, d);
if (r < 0)
goto mget_out;
r = qt2_getregister(dev, port_priv->device_port, UART_MSR, d + 1);
if (r < 0)
goto mget_out;
r = (d[0] & UART_MCR_DTR ? TIOCM_DTR : 0) |
(d[0] & UART_MCR_RTS ? TIOCM_RTS : 0) |
(d[1] & UART_MSR_CTS ? TIOCM_CTS : 0) |
(d[1] & UART_MSR_DCD ? TIOCM_CAR : 0) |
(d[1] & UART_MSR_RI ? TIOCM_RI : 0) |
(d[1] & UART_MSR_DSR ? TIOCM_DSR : 0);
mget_out:
kfree(d);
return r;
}
static int qt2_tiocmset(struct tty_struct *tty,
unsigned int set, unsigned int clear)
{
struct qt2_port_private *port_priv;
port_priv = usb_get_serial_port_data(tty->driver_data);
return update_mctrl(port_priv, set, clear);
}
static void qt2_break_ctl(struct tty_struct *tty, int break_state)
{
struct usb_serial_port *port = tty->driver_data;
struct qt2_port_private *port_priv;
int status;
u16 val;
port_priv = usb_get_serial_port_data(port);
val = (break_state == -1) ? 1 : 0;
status = qt2_control_msg(port->serial->dev, QT2_BREAK_CONTROL,
val, port_priv->device_port);
if (status < 0)
dev_warn(&port->dev,
"%s - failed to send control message: %i\n", __func__,
status);
}
static void qt2_dtr_rts(struct usb_serial_port *port, int on)
{
struct usb_device *dev = port->serial->dev;
struct qt2_port_private *port_priv = usb_get_serial_port_data(port);
/* Disable flow control */
if (!on) {
if (qt2_setregister(dev, port_priv->device_port,
UART_MCR, 0) < 0)
dev_warn(&port->dev, "error from flowcontrol urb\n");
}
/* drop RTS and DTR */
if (on)
update_mctrl(port_priv, TIOCM_DTR | TIOCM_RTS, 0);
else
update_mctrl(port_priv, 0, TIOCM_DTR | TIOCM_RTS);
}
static void qt2_update_msr(struct usb_serial_port *port, unsigned char *ch)
{
struct qt2_port_private *port_priv;
u8 newMSR = (u8) *ch;
unsigned long flags;
port_priv = usb_get_serial_port_data(port);
spin_lock_irqsave(&port_priv->lock, flags);
port_priv->shadowMSR = newMSR;
spin_unlock_irqrestore(&port_priv->lock, flags);
if (newMSR & UART_MSR_ANY_DELTA) {
/* update input line counters */
if (newMSR & UART_MSR_DCTS)
port->icount.cts++;
if (newMSR & UART_MSR_DDSR)
port->icount.dsr++;
if (newMSR & UART_MSR_DDCD)
port->icount.dcd++;
if (newMSR & UART_MSR_TERI)
port->icount.rng++;
wake_up_interruptible(&port->port.delta_msr_wait);
}
}
static void qt2_update_lsr(struct usb_serial_port *port, unsigned char *ch)
{
struct qt2_port_private *port_priv;
struct async_icount *icount;
unsigned long flags;
u8 newLSR = (u8) *ch;
port_priv = usb_get_serial_port_data(port);
if (newLSR & UART_LSR_BI)
newLSR &= (u8) (UART_LSR_OE | UART_LSR_BI);
spin_lock_irqsave(&port_priv->lock, flags);
port_priv->shadowLSR = newLSR;
spin_unlock_irqrestore(&port_priv->lock, flags);
icount = &port->icount;
if (newLSR & UART_LSR_BRK_ERROR_BITS) {
if (newLSR & UART_LSR_BI)
icount->brk++;
if (newLSR & UART_LSR_OE)
icount->overrun++;
if (newLSR & UART_LSR_PE)
icount->parity++;
if (newLSR & UART_LSR_FE)
icount->frame++;
}
}
static int qt2_write_room(struct tty_struct *tty)
{
struct usb_serial_port *port = tty->driver_data;
struct qt2_port_private *port_priv;
unsigned long flags = 0;
int r;
port_priv = usb_get_serial_port_data(port);
spin_lock_irqsave(&port_priv->urb_lock, flags);
if (port_priv->urb_in_use)
r = 0;
else
r = QT2_WRITE_BUFFER_SIZE - QT2_WRITE_CONTROL_SIZE;
spin_unlock_irqrestore(&port_priv->urb_lock, flags);
return r;
}
static int qt2_write(struct tty_struct *tty,
struct usb_serial_port *port,
const unsigned char *buf, int count)
{
struct qt2_port_private *port_priv;
struct urb *write_urb;
unsigned char *data;
unsigned long flags;
int status;
int bytes_out = 0;
port_priv = usb_get_serial_port_data(port);
if (port_priv->write_urb == NULL) {
dev_err(&port->dev, "%s - no output urb\n", __func__);
return 0;
}
write_urb = port_priv->write_urb;
count = min(count, QT2_WRITE_BUFFER_SIZE - QT2_WRITE_CONTROL_SIZE);
data = write_urb->transfer_buffer;
spin_lock_irqsave(&port_priv->urb_lock, flags);
if (port_priv->urb_in_use) {
dev_err(&port->dev, "qt2_write - urb is in use\n");
goto write_out;
}
*data++ = QT2_CONTROL_BYTE;
*data++ = QT2_CONTROL_BYTE;
*data++ = port_priv->device_port;
put_unaligned_le16(count, data);
data += 2;
memcpy(data, buf, count);
write_urb->transfer_buffer_length = count + QT2_WRITE_CONTROL_SIZE;
status = usb_submit_urb(write_urb, GFP_ATOMIC);
if (status == 0) {
port_priv->urb_in_use = true;
bytes_out += count;
}
write_out:
spin_unlock_irqrestore(&port_priv->urb_lock, flags);
return bytes_out;
}
static struct usb_serial_driver qt2_device = {
.driver = {
.owner = THIS_MODULE,
.name = "quatech-serial",
},
.description = DRIVER_DESC,
.id_table = id_table,
.open = qt2_open,
.close = qt2_close,
.write = qt2_write,
.write_room = qt2_write_room,
.calc_num_ports = qt2_calc_num_ports,
.attach = qt2_attach,
.release = qt2_release,
.disconnect = qt2_disconnect,
.port_probe = qt2_port_probe,
.port_remove = qt2_port_remove,
.dtr_rts = qt2_dtr_rts,
.break_ctl = qt2_break_ctl,
.tiocmget = qt2_tiocmget,
.tiocmset = qt2_tiocmset,
.tiocmiwait = usb_serial_generic_tiocmiwait,
.get_icount = usb_serial_generic_get_icount,
.get_serial = get_serial_info,
.set_termios = qt2_set_termios,
};
static struct usb_serial_driver *const serial_drivers[] = {
&qt2_device, NULL
};
module_usb_serial_driver(serial_drivers, id_table);
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL v2");
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