--- /dev/null
+/*
+ * usb-serial driver for Quatech USB 2 devices
+ *
+ * Copyright (C) 2012 Bill Pemberton (wfp5p@virginia.edu)
+ *
+ * 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.
+ *
+ *
+ * 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_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_getdevice(struct usb_device *dev, u8 *data)
+{
+ return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
+ QT_SET_GET_DEVICE, 0xc0, 0, 0,
+ data, 3, QT2_USB_TIMEOUT);
+}
+
+static inline int qt2_getregister(struct usb_device *dev,
+ u8 uart,
+ u8 reg,
+ u8 *data)
+{
+ return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
+ QT_SET_GET_REGISTER, 0xc0, reg,
+ uart, data, sizeof(*data), QT2_USB_TIMEOUT);
+
+}
+
+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 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 < 0) {
+ dev_err(&port->dev, "%s - open port failed %i\n", __func__,
+ status);
+ 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;
+ unsigned long flags;
+ int i;
+
+ serial = port->serial;
+ port_priv = usb_get_serial_port_data(port);
+
+ spin_lock_irqsave(&port_priv->urb_lock, flags);
+ usb_kill_urb(port_priv->write_urb);
+ port_priv->urb_in_use = false;
+ spin_unlock_irqrestore(&port_priv->urb_lock, flags);
+
+ /* 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 usb_serial_port *port,
+ struct serial_struct __user *retinfo)
+{
+ struct serial_struct tmp;
+
+ if (!retinfo)
+ return -EFAULT;
+
+ memset(&tmp, 0, sizeof(tmp));
+ tmp.line = port->minor;
+ tmp.port = 0;
+ tmp.irq = 0;
+ tmp.flags = ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ;
+ tmp.xmit_fifo_size = port->bulk_out_size;
+ tmp.baud_base = 9600;
+ tmp.close_delay = 5*HZ;
+ tmp.closing_wait = 30*HZ;
+
+ if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
+ return -EFAULT;
+ return 0;
+}
+
+static int qt2_ioctl(struct tty_struct *tty,
+ unsigned int cmd, unsigned long arg)
+{
+ struct usb_serial_port *port = tty->driver_data;
+
+ switch (cmd) {
+ case TIOCGSERIAL:
+ return get_serial_info(port,
+ (struct serial_struct __user *)arg);
+ default:
+ break;
+ }
+
+ return -ENOIOCTLCMD;
+}
+
+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;
+ struct qt2_port_private *port_priv;
+ 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];
+ port_priv = usb_get_serial_port_data(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];
+ port_priv = usb_get_serial_port_data(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_buffer_request_room(&port->port, 2);
+ 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_buffer_request_room(&port->port, 1);
+ tty_insert_flip_string(&port->port, ch, 1);
+ }
+
+ 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;
+
+ port = urb->context;
+ port_priv = usb_get_serial_port_data(port);
+
+ spin_lock(&port_priv->urb_lock);
+
+ port_priv->urb_in_use = false;
+ usb_serial_port_softint(port);
+
+ spin_unlock(&port_priv->urb_lock);
+
+}
+
+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 == true) {
+ 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,
+ .ioctl = qt2_ioctl,
+ .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");
Code Review / kvmfornfv.git / blobdiff