--- /dev/null
+/*
+ * Ours Technology Inc. OTi-6858 USB to serial adapter driver.
+ *
+ * Copyleft (C) 2007 Kees Lemmens (adapted for kernel 2.6.20)
+ * Copyright (C) 2006 Tomasz Michal Lukaszewski (FIXME: add e-mail)
+ * Copyright (C) 2001-2004 Greg Kroah-Hartman (greg@kroah.com)
+ * Copyright (C) 2003 IBM Corp.
+ *
+ * Many thanks to the authors of pl2303 driver: all functions in this file
+ * are heavily based on pl2303 code, buffering code is a 1-to-1 copy.
+ *
+ * Warning! You use this driver on your own risk! The only official
+ * description of this device I have is datasheet from manufacturer,
+ * and it doesn't contain almost any information needed to write a driver.
+ * Almost all knowlegde used while writing this driver was gathered by:
+ * - analyzing traffic between device and the M$ Windows 2000 driver,
+ * - trying different bit combinations and checking pin states
+ * with a voltmeter,
+ * - receiving malformed frames and producing buffer overflows
+ * to learn how errors are reported,
+ * So, THIS CODE CAN DESTROY OTi-6858 AND ANY OTHER DEVICES, THAT ARE
+ * CONNECTED TO IT!
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License.
+ *
+ * See Documentation/usb/usb-serial.txt for more information on using this
+ * driver
+ *
+ * TODO:
+ * - implement correct flushing for ioctls and oti6858_close()
+ * - check how errors (rx overflow, parity error, framing error) are reported
+ * - implement oti6858_break_ctl()
+ * - implement more ioctls
+ * - test/implement flow control
+ * - allow setting custom baud rates
+ */
+
+#include <linux/kernel.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/serial.h>
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/spinlock.h>
+#include <linux/usb.h>
+#include <linux/usb/serial.h>
+#include <linux/uaccess.h>
+#include <linux/kfifo.h>
+#include "oti6858.h"
+
+#define OTI6858_DESCRIPTION \
+ "Ours Technology Inc. OTi-6858 USB to serial adapter driver"
+#define OTI6858_AUTHOR "Tomasz Michal Lukaszewski <FIXME@FIXME>"
+
+static const struct usb_device_id id_table[] = {
+ { USB_DEVICE(OTI6858_VENDOR_ID, OTI6858_PRODUCT_ID) },
+ { }
+};
+
+MODULE_DEVICE_TABLE(usb, id_table);
+
+/* requests */
+#define OTI6858_REQ_GET_STATUS (USB_DIR_IN | USB_TYPE_VENDOR | 0x00)
+#define OTI6858_REQ_T_GET_STATUS 0x01
+
+#define OTI6858_REQ_SET_LINE (USB_DIR_OUT | USB_TYPE_VENDOR | 0x00)
+#define OTI6858_REQ_T_SET_LINE 0x00
+
+#define OTI6858_REQ_CHECK_TXBUFF (USB_DIR_IN | USB_TYPE_VENDOR | 0x01)
+#define OTI6858_REQ_T_CHECK_TXBUFF 0x00
+
+/* format of the control packet */
+struct oti6858_control_pkt {
+ __le16 divisor; /* baud rate = 96000000 / (16 * divisor), LE */
+#define OTI6858_MAX_BAUD_RATE 3000000
+ u8 frame_fmt;
+#define FMT_STOP_BITS_MASK 0xc0
+#define FMT_STOP_BITS_1 0x00
+#define FMT_STOP_BITS_2 0x40 /* 1.5 stop bits if FMT_DATA_BITS_5 */
+#define FMT_PARITY_MASK 0x38
+#define FMT_PARITY_NONE 0x00
+#define FMT_PARITY_ODD 0x08
+#define FMT_PARITY_EVEN 0x18
+#define FMT_PARITY_MARK 0x28
+#define FMT_PARITY_SPACE 0x38
+#define FMT_DATA_BITS_MASK 0x03
+#define FMT_DATA_BITS_5 0x00
+#define FMT_DATA_BITS_6 0x01
+#define FMT_DATA_BITS_7 0x02
+#define FMT_DATA_BITS_8 0x03
+ u8 something; /* always equals 0x43 */
+ u8 control; /* settings of flow control lines */
+#define CONTROL_MASK 0x0c
+#define CONTROL_DTR_HIGH 0x08
+#define CONTROL_RTS_HIGH 0x04
+ u8 tx_status;
+#define TX_BUFFER_EMPTIED 0x09
+ u8 pin_state;
+#define PIN_MASK 0x3f
+#define PIN_MSR_MASK 0x1b
+#define PIN_RTS 0x20 /* output pin */
+#define PIN_CTS 0x10 /* input pin, active low */
+#define PIN_DSR 0x08 /* input pin, active low */
+#define PIN_DTR 0x04 /* output pin */
+#define PIN_RI 0x02 /* input pin, active low */
+#define PIN_DCD 0x01 /* input pin, active low */
+ u8 rx_bytes_avail; /* number of bytes in rx buffer */;
+};
+
+#define OTI6858_CTRL_PKT_SIZE sizeof(struct oti6858_control_pkt)
+#define OTI6858_CTRL_EQUALS_PENDING(a, priv) \
+ (((a)->divisor == (priv)->pending_setup.divisor) \
+ && ((a)->control == (priv)->pending_setup.control) \
+ && ((a)->frame_fmt == (priv)->pending_setup.frame_fmt))
+
+/* function prototypes */
+static int oti6858_open(struct tty_struct *tty, struct usb_serial_port *port);
+static void oti6858_close(struct usb_serial_port *port);
+static void oti6858_set_termios(struct tty_struct *tty,
+ struct usb_serial_port *port, struct ktermios *old);
+static void oti6858_init_termios(struct tty_struct *tty);
+static void oti6858_read_int_callback(struct urb *urb);
+static void oti6858_read_bulk_callback(struct urb *urb);
+static void oti6858_write_bulk_callback(struct urb *urb);
+static int oti6858_write(struct tty_struct *tty, struct usb_serial_port *port,
+ const unsigned char *buf, int count);
+static int oti6858_write_room(struct tty_struct *tty);
+static int oti6858_chars_in_buffer(struct tty_struct *tty);
+static int oti6858_tiocmget(struct tty_struct *tty);
+static int oti6858_tiocmset(struct tty_struct *tty,
+ unsigned int set, unsigned int clear);
+static int oti6858_port_probe(struct usb_serial_port *port);
+static int oti6858_port_remove(struct usb_serial_port *port);
+
+/* device info */
+static struct usb_serial_driver oti6858_device = {
+ .driver = {
+ .owner = THIS_MODULE,
+ .name = "oti6858",
+ },
+ .id_table = id_table,
+ .num_ports = 1,
+ .open = oti6858_open,
+ .close = oti6858_close,
+ .write = oti6858_write,
+ .set_termios = oti6858_set_termios,
+ .init_termios = oti6858_init_termios,
+ .tiocmget = oti6858_tiocmget,
+ .tiocmset = oti6858_tiocmset,
+ .tiocmiwait = usb_serial_generic_tiocmiwait,
+ .read_bulk_callback = oti6858_read_bulk_callback,
+ .read_int_callback = oti6858_read_int_callback,
+ .write_bulk_callback = oti6858_write_bulk_callback,
+ .write_room = oti6858_write_room,
+ .chars_in_buffer = oti6858_chars_in_buffer,
+ .port_probe = oti6858_port_probe,
+ .port_remove = oti6858_port_remove,
+};
+
+static struct usb_serial_driver * const serial_drivers[] = {
+ &oti6858_device, NULL
+};
+
+struct oti6858_private {
+ spinlock_t lock;
+
+ struct oti6858_control_pkt status;
+
+ struct {
+ u8 read_urb_in_use;
+ u8 write_urb_in_use;
+ } flags;
+ struct delayed_work delayed_write_work;
+
+ struct {
+ __le16 divisor;
+ u8 frame_fmt;
+ u8 control;
+ } pending_setup;
+ u8 transient;
+ u8 setup_done;
+ struct delayed_work delayed_setup_work;
+
+ struct usb_serial_port *port; /* USB port with which associated */
+};
+
+static void setup_line(struct work_struct *work)
+{
+ struct oti6858_private *priv = container_of(work,
+ struct oti6858_private, delayed_setup_work.work);
+ struct usb_serial_port *port = priv->port;
+ struct oti6858_control_pkt *new_setup;
+ unsigned long flags;
+ int result;
+
+ new_setup = kmalloc(OTI6858_CTRL_PKT_SIZE, GFP_KERNEL);
+ if (!new_setup) {
+ /* we will try again */
+ schedule_delayed_work(&priv->delayed_setup_work,
+ msecs_to_jiffies(2));
+ return;
+ }
+
+ result = usb_control_msg(port->serial->dev,
+ usb_rcvctrlpipe(port->serial->dev, 0),
+ OTI6858_REQ_T_GET_STATUS,
+ OTI6858_REQ_GET_STATUS,
+ 0, 0,
+ new_setup, OTI6858_CTRL_PKT_SIZE,
+ 100);
+
+ if (result != OTI6858_CTRL_PKT_SIZE) {
+ dev_err(&port->dev, "%s(): error reading status\n", __func__);
+ kfree(new_setup);
+ /* we will try again */
+ schedule_delayed_work(&priv->delayed_setup_work,
+ msecs_to_jiffies(2));
+ return;
+ }
+
+ spin_lock_irqsave(&priv->lock, flags);
+ if (!OTI6858_CTRL_EQUALS_PENDING(new_setup, priv)) {
+ new_setup->divisor = priv->pending_setup.divisor;
+ new_setup->control = priv->pending_setup.control;
+ new_setup->frame_fmt = priv->pending_setup.frame_fmt;
+
+ spin_unlock_irqrestore(&priv->lock, flags);
+ result = usb_control_msg(port->serial->dev,
+ usb_sndctrlpipe(port->serial->dev, 0),
+ OTI6858_REQ_T_SET_LINE,
+ OTI6858_REQ_SET_LINE,
+ 0, 0,
+ new_setup, OTI6858_CTRL_PKT_SIZE,
+ 100);
+ } else {
+ spin_unlock_irqrestore(&priv->lock, flags);
+ result = 0;
+ }
+ kfree(new_setup);
+
+ spin_lock_irqsave(&priv->lock, flags);
+ if (result != OTI6858_CTRL_PKT_SIZE)
+ priv->transient = 0;
+ priv->setup_done = 1;
+ spin_unlock_irqrestore(&priv->lock, flags);
+
+ dev_dbg(&port->dev, "%s(): submitting interrupt urb\n", __func__);
+ result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
+ if (result != 0) {
+ dev_err(&port->dev, "%s(): usb_submit_urb() failed with error %d\n",
+ __func__, result);
+ }
+}
+
+static void send_data(struct work_struct *work)
+{
+ struct oti6858_private *priv = container_of(work,
+ struct oti6858_private, delayed_write_work.work);
+ struct usb_serial_port *port = priv->port;
+ int count = 0, result;
+ unsigned long flags;
+ u8 *allow;
+
+ spin_lock_irqsave(&priv->lock, flags);
+ if (priv->flags.write_urb_in_use) {
+ spin_unlock_irqrestore(&priv->lock, flags);
+ schedule_delayed_work(&priv->delayed_write_work,
+ msecs_to_jiffies(2));
+ return;
+ }
+ priv->flags.write_urb_in_use = 1;
+ spin_unlock_irqrestore(&priv->lock, flags);
+
+ spin_lock_irqsave(&port->lock, flags);
+ count = kfifo_len(&port->write_fifo);
+ spin_unlock_irqrestore(&port->lock, flags);
+
+ if (count > port->bulk_out_size)
+ count = port->bulk_out_size;
+
+ if (count != 0) {
+ allow = kmalloc(1, GFP_KERNEL);
+ if (!allow)
+ return;
+
+ result = usb_control_msg(port->serial->dev,
+ usb_rcvctrlpipe(port->serial->dev, 0),
+ OTI6858_REQ_T_CHECK_TXBUFF,
+ OTI6858_REQ_CHECK_TXBUFF,
+ count, 0, allow, 1, 100);
+ if (result != 1 || *allow != 0)
+ count = 0;
+ kfree(allow);
+ }
+
+ if (count == 0) {
+ priv->flags.write_urb_in_use = 0;
+
+ dev_dbg(&port->dev, "%s(): submitting interrupt urb\n", __func__);
+ result = usb_submit_urb(port->interrupt_in_urb, GFP_NOIO);
+ if (result != 0) {
+ dev_err(&port->dev, "%s(): usb_submit_urb() failed with error %d\n",
+ __func__, result);
+ }
+ return;
+ }
+
+ count = kfifo_out_locked(&port->write_fifo,
+ port->write_urb->transfer_buffer,
+ count, &port->lock);
+ port->write_urb->transfer_buffer_length = count;
+ result = usb_submit_urb(port->write_urb, GFP_NOIO);
+ if (result != 0) {
+ dev_err_console(port, "%s(): usb_submit_urb() failed with error %d\n",
+ __func__, result);
+ priv->flags.write_urb_in_use = 0;
+ }
+
+ usb_serial_port_softint(port);
+}
+
+static int oti6858_port_probe(struct usb_serial_port *port)
+{
+ struct oti6858_private *priv;
+
+ priv = kzalloc(sizeof(*priv), GFP_KERNEL);
+ if (!priv)
+ return -ENOMEM;
+
+ spin_lock_init(&priv->lock);
+ priv->port = port;
+ INIT_DELAYED_WORK(&priv->delayed_setup_work, setup_line);
+ INIT_DELAYED_WORK(&priv->delayed_write_work, send_data);
+
+ usb_set_serial_port_data(port, priv);
+
+ port->port.drain_delay = 256; /* FIXME: check the FIFO length */
+
+ return 0;
+}
+
+static int oti6858_port_remove(struct usb_serial_port *port)
+{
+ struct oti6858_private *priv;
+
+ priv = usb_get_serial_port_data(port);
+ kfree(priv);
+
+ return 0;
+}
+
+static int oti6858_write(struct tty_struct *tty, struct usb_serial_port *port,
+ const unsigned char *buf, int count)
+{
+ if (!count)
+ return count;
+
+ count = kfifo_in_locked(&port->write_fifo, buf, count, &port->lock);
+
+ return count;
+}
+
+static int oti6858_write_room(struct tty_struct *tty)
+{
+ struct usb_serial_port *port = tty->driver_data;
+ int room = 0;
+ unsigned long flags;
+
+ spin_lock_irqsave(&port->lock, flags);
+ room = kfifo_avail(&port->write_fifo);
+ spin_unlock_irqrestore(&port->lock, flags);
+
+ return room;
+}
+
+static int oti6858_chars_in_buffer(struct tty_struct *tty)
+{
+ struct usb_serial_port *port = tty->driver_data;
+ int chars = 0;
+ unsigned long flags;
+
+ spin_lock_irqsave(&port->lock, flags);
+ chars = kfifo_len(&port->write_fifo);
+ spin_unlock_irqrestore(&port->lock, flags);
+
+ return chars;
+}
+
+static void oti6858_init_termios(struct tty_struct *tty)
+{
+ tty->termios = tty_std_termios;
+ tty->termios.c_cflag = B38400 | CS8 | CREAD | HUPCL | CLOCAL;
+ tty->termios.c_ispeed = 38400;
+ tty->termios.c_ospeed = 38400;
+}
+
+static void oti6858_set_termios(struct tty_struct *tty,
+ struct usb_serial_port *port, struct ktermios *old_termios)
+{
+ struct oti6858_private *priv = usb_get_serial_port_data(port);
+ unsigned long flags;
+ unsigned int cflag;
+ u8 frame_fmt, control;
+ __le16 divisor;
+ int br;
+
+ cflag = tty->termios.c_cflag;
+
+ spin_lock_irqsave(&priv->lock, flags);
+ divisor = priv->pending_setup.divisor;
+ frame_fmt = priv->pending_setup.frame_fmt;
+ control = priv->pending_setup.control;
+ spin_unlock_irqrestore(&priv->lock, flags);
+
+ frame_fmt &= ~FMT_DATA_BITS_MASK;
+ switch (cflag & CSIZE) {
+ case CS5:
+ frame_fmt |= FMT_DATA_BITS_5;
+ break;
+ case CS6:
+ frame_fmt |= FMT_DATA_BITS_6;
+ break;
+ case CS7:
+ frame_fmt |= FMT_DATA_BITS_7;
+ break;
+ default:
+ case CS8:
+ frame_fmt |= FMT_DATA_BITS_8;
+ break;
+ }
+
+ /* manufacturer claims that this device can work with baud rates
+ * up to 3 Mbps; I've tested it only on 115200 bps, so I can't
+ * guarantee that any other baud rate will work (especially
+ * the higher ones)
+ */
+ br = tty_get_baud_rate(tty);
+ if (br == 0) {
+ divisor = 0;
+ } else {
+ int real_br;
+ int new_divisor;
+ br = min(br, OTI6858_MAX_BAUD_RATE);
+
+ new_divisor = (96000000 + 8 * br) / (16 * br);
+ real_br = 96000000 / (16 * new_divisor);
+ divisor = cpu_to_le16(new_divisor);
+ tty_encode_baud_rate(tty, real_br, real_br);
+ }
+
+ frame_fmt &= ~FMT_STOP_BITS_MASK;
+ if ((cflag & CSTOPB) != 0)
+ frame_fmt |= FMT_STOP_BITS_2;
+ else
+ frame_fmt |= FMT_STOP_BITS_1;
+
+ frame_fmt &= ~FMT_PARITY_MASK;
+ if ((cflag & PARENB) != 0) {
+ if ((cflag & PARODD) != 0)
+ frame_fmt |= FMT_PARITY_ODD;
+ else
+ frame_fmt |= FMT_PARITY_EVEN;
+ } else {
+ frame_fmt |= FMT_PARITY_NONE;
+ }
+
+ control &= ~CONTROL_MASK;
+ if ((cflag & CRTSCTS) != 0)
+ control |= (CONTROL_DTR_HIGH | CONTROL_RTS_HIGH);
+
+ /* change control lines if we are switching to or from B0 */
+ /* FIXME:
+ spin_lock_irqsave(&priv->lock, flags);
+ control = priv->line_control;
+ if ((cflag & CBAUD) == B0)
+ priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS);
+ else
+ priv->line_control |= (CONTROL_DTR | CONTROL_RTS);
+ if (control != priv->line_control) {
+ control = priv->line_control;
+ spin_unlock_irqrestore(&priv->lock, flags);
+ set_control_lines(serial->dev, control);
+ } else {
+ spin_unlock_irqrestore(&priv->lock, flags);
+ }
+ */
+
+ spin_lock_irqsave(&priv->lock, flags);
+ if (divisor != priv->pending_setup.divisor
+ || control != priv->pending_setup.control
+ || frame_fmt != priv->pending_setup.frame_fmt) {
+ priv->pending_setup.divisor = divisor;
+ priv->pending_setup.control = control;
+ priv->pending_setup.frame_fmt = frame_fmt;
+ }
+ spin_unlock_irqrestore(&priv->lock, flags);
+}
+
+static int oti6858_open(struct tty_struct *tty, struct usb_serial_port *port)
+{
+ struct oti6858_private *priv = usb_get_serial_port_data(port);
+ struct usb_serial *serial = port->serial;
+ struct oti6858_control_pkt *buf;
+ unsigned long flags;
+ int result;
+
+ usb_clear_halt(serial->dev, port->write_urb->pipe);
+ usb_clear_halt(serial->dev, port->read_urb->pipe);
+
+ buf = kmalloc(OTI6858_CTRL_PKT_SIZE, GFP_KERNEL);
+ if (!buf)
+ return -ENOMEM;
+
+ result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
+ OTI6858_REQ_T_GET_STATUS,
+ OTI6858_REQ_GET_STATUS,
+ 0, 0,
+ buf, OTI6858_CTRL_PKT_SIZE,
+ 100);
+ if (result != OTI6858_CTRL_PKT_SIZE) {
+ /* assume default (after power-on reset) values */
+ buf->divisor = cpu_to_le16(0x009c); /* 38400 bps */
+ buf->frame_fmt = 0x03; /* 8N1 */
+ buf->something = 0x43;
+ buf->control = 0x4c; /* DTR, RTS */
+ buf->tx_status = 0x00;
+ buf->pin_state = 0x5b; /* RTS, CTS, DSR, DTR, RI, DCD */
+ buf->rx_bytes_avail = 0x00;
+ }
+
+ spin_lock_irqsave(&priv->lock, flags);
+ memcpy(&priv->status, buf, OTI6858_CTRL_PKT_SIZE);
+ priv->pending_setup.divisor = buf->divisor;
+ priv->pending_setup.frame_fmt = buf->frame_fmt;
+ priv->pending_setup.control = buf->control;
+ spin_unlock_irqrestore(&priv->lock, flags);
+ kfree(buf);
+
+ dev_dbg(&port->dev, "%s(): submitting interrupt urb\n", __func__);
+ result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
+ if (result != 0) {
+ dev_err(&port->dev, "%s(): usb_submit_urb() failed with error %d\n",
+ __func__, result);
+ oti6858_close(port);
+ return result;
+ }
+
+ /* setup termios */
+ if (tty)
+ oti6858_set_termios(tty, port, NULL);
+
+ return 0;
+}
+
+static void oti6858_close(struct usb_serial_port *port)
+{
+ struct oti6858_private *priv = usb_get_serial_port_data(port);
+ unsigned long flags;
+
+ spin_lock_irqsave(&port->lock, flags);
+ /* clear out any remaining data in the buffer */
+ kfifo_reset_out(&port->write_fifo);
+ spin_unlock_irqrestore(&port->lock, flags);
+
+ dev_dbg(&port->dev, "%s(): after buf_clear()\n", __func__);
+
+ /* cancel scheduled setup */
+ cancel_delayed_work_sync(&priv->delayed_setup_work);
+ cancel_delayed_work_sync(&priv->delayed_write_work);
+
+ /* shutdown our urbs */
+ dev_dbg(&port->dev, "%s(): shutting down urbs\n", __func__);
+ usb_kill_urb(port->write_urb);
+ usb_kill_urb(port->read_urb);
+ usb_kill_urb(port->interrupt_in_urb);
+}
+
+static int oti6858_tiocmset(struct tty_struct *tty,
+ unsigned int set, unsigned int clear)
+{
+ struct usb_serial_port *port = tty->driver_data;
+ struct oti6858_private *priv = usb_get_serial_port_data(port);
+ unsigned long flags;
+ u8 control;
+
+ dev_dbg(&port->dev, "%s(set = 0x%08x, clear = 0x%08x)\n",
+ __func__, set, clear);
+
+ /* FIXME: check if this is correct (active high/low) */
+ spin_lock_irqsave(&priv->lock, flags);
+ control = priv->pending_setup.control;
+ if ((set & TIOCM_RTS) != 0)
+ control |= CONTROL_RTS_HIGH;
+ if ((set & TIOCM_DTR) != 0)
+ control |= CONTROL_DTR_HIGH;
+ if ((clear & TIOCM_RTS) != 0)
+ control &= ~CONTROL_RTS_HIGH;
+ if ((clear & TIOCM_DTR) != 0)
+ control &= ~CONTROL_DTR_HIGH;
+
+ if (control != priv->pending_setup.control)
+ priv->pending_setup.control = control;
+
+ spin_unlock_irqrestore(&priv->lock, flags);
+ return 0;
+}
+
+static int oti6858_tiocmget(struct tty_struct *tty)
+{
+ struct usb_serial_port *port = tty->driver_data;
+ struct oti6858_private *priv = usb_get_serial_port_data(port);
+ unsigned long flags;
+ unsigned pin_state;
+ unsigned result = 0;
+
+ spin_lock_irqsave(&priv->lock, flags);
+ pin_state = priv->status.pin_state & PIN_MASK;
+ spin_unlock_irqrestore(&priv->lock, flags);
+
+ /* FIXME: check if this is correct (active high/low) */
+ if ((pin_state & PIN_RTS) != 0)
+ result |= TIOCM_RTS;
+ if ((pin_state & PIN_CTS) != 0)
+ result |= TIOCM_CTS;
+ if ((pin_state & PIN_DSR) != 0)
+ result |= TIOCM_DSR;
+ if ((pin_state & PIN_DTR) != 0)
+ result |= TIOCM_DTR;
+ if ((pin_state & PIN_RI) != 0)
+ result |= TIOCM_RI;
+ if ((pin_state & PIN_DCD) != 0)
+ result |= TIOCM_CD;
+
+ dev_dbg(&port->dev, "%s() = 0x%08x\n", __func__, result);
+
+ return result;
+}
+
+static void oti6858_read_int_callback(struct urb *urb)
+{
+ struct usb_serial_port *port = urb->context;
+ struct oti6858_private *priv = usb_get_serial_port_data(port);
+ int transient = 0, can_recv = 0, resubmit = 1;
+ int status = urb->status;
+
+ switch (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 with status: %d\n",
+ __func__, status);
+ return;
+ default:
+ dev_dbg(&urb->dev->dev, "%s(): nonzero urb status received: %d\n",
+ __func__, status);
+ break;
+ }
+
+ if (status == 0 && urb->actual_length == OTI6858_CTRL_PKT_SIZE) {
+ struct oti6858_control_pkt *xs = urb->transfer_buffer;
+ unsigned long flags;
+
+ spin_lock_irqsave(&priv->lock, flags);
+
+ if (!priv->transient) {
+ if (!OTI6858_CTRL_EQUALS_PENDING(xs, priv)) {
+ if (xs->rx_bytes_avail == 0) {
+ priv->transient = 4;
+ priv->setup_done = 0;
+ resubmit = 0;
+ dev_dbg(&port->dev, "%s(): scheduling setup_line()\n", __func__);
+ schedule_delayed_work(&priv->delayed_setup_work, 0);
+ }
+ }
+ } else {
+ if (OTI6858_CTRL_EQUALS_PENDING(xs, priv)) {
+ priv->transient = 0;
+ } else if (!priv->setup_done) {
+ resubmit = 0;
+ } else if (--priv->transient == 0) {
+ if (xs->rx_bytes_avail == 0) {
+ priv->transient = 4;
+ priv->setup_done = 0;
+ resubmit = 0;
+ dev_dbg(&port->dev, "%s(): scheduling setup_line()\n", __func__);
+ schedule_delayed_work(&priv->delayed_setup_work, 0);
+ }
+ }
+ }
+
+ if (!priv->transient) {
+ u8 delta = xs->pin_state ^ priv->status.pin_state;
+
+ if (delta & PIN_MSR_MASK) {
+ if (delta & PIN_CTS)
+ port->icount.cts++;
+ if (delta & PIN_DSR)
+ port->icount.dsr++;
+ if (delta & PIN_RI)
+ port->icount.rng++;
+ if (delta & PIN_DCD)
+ port->icount.dcd++;
+
+ wake_up_interruptible(&port->port.delta_msr_wait);
+ }
+
+ memcpy(&priv->status, xs, OTI6858_CTRL_PKT_SIZE);
+ }
+
+ if (!priv->transient && xs->rx_bytes_avail != 0) {
+ can_recv = xs->rx_bytes_avail;
+ priv->flags.read_urb_in_use = 1;
+ }
+
+ transient = priv->transient;
+ spin_unlock_irqrestore(&priv->lock, flags);
+ }
+
+ if (can_recv) {
+ int result;
+
+ result = usb_submit_urb(port->read_urb, GFP_ATOMIC);
+ if (result != 0) {
+ priv->flags.read_urb_in_use = 0;
+ dev_err(&port->dev, "%s(): usb_submit_urb() failed,"
+ " error %d\n", __func__, result);
+ } else {
+ resubmit = 0;
+ }
+ } else if (!transient) {
+ unsigned long flags;
+ int count;
+
+ spin_lock_irqsave(&port->lock, flags);
+ count = kfifo_len(&port->write_fifo);
+ spin_unlock_irqrestore(&port->lock, flags);
+
+ spin_lock_irqsave(&priv->lock, flags);
+ if (priv->flags.write_urb_in_use == 0 && count != 0) {
+ schedule_delayed_work(&priv->delayed_write_work, 0);
+ resubmit = 0;
+ }
+ spin_unlock_irqrestore(&priv->lock, flags);
+ }
+
+ if (resubmit) {
+ int result;
+
+/* dev_dbg(&urb->dev->dev, "%s(): submitting interrupt urb\n", __func__); */
+ result = usb_submit_urb(urb, GFP_ATOMIC);
+ if (result != 0) {
+ dev_err(&urb->dev->dev,
+ "%s(): usb_submit_urb() failed with"
+ " error %d\n", __func__, result);
+ }
+ }
+}
+
+static void oti6858_read_bulk_callback(struct urb *urb)
+{
+ struct usb_serial_port *port = urb->context;
+ struct oti6858_private *priv = usb_get_serial_port_data(port);
+ unsigned char *data = urb->transfer_buffer;
+ unsigned long flags;
+ int status = urb->status;
+ int result;
+
+ spin_lock_irqsave(&priv->lock, flags);
+ priv->flags.read_urb_in_use = 0;
+ spin_unlock_irqrestore(&priv->lock, flags);
+
+ if (status != 0) {
+ dev_dbg(&urb->dev->dev, "%s(): unable to handle the error, exiting\n", __func__);
+ return;
+ }
+
+ if (urb->actual_length > 0) {
+ tty_insert_flip_string(&port->port, data, urb->actual_length);
+ tty_flip_buffer_push(&port->port);
+ }
+
+ /* schedule the interrupt urb */
+ result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC);
+ if (result != 0 && result != -EPERM) {
+ dev_err(&port->dev, "%s(): usb_submit_urb() failed,"
+ " error %d\n", __func__, result);
+ }
+}
+
+static void oti6858_write_bulk_callback(struct urb *urb)
+{
+ struct usb_serial_port *port = urb->context;
+ struct oti6858_private *priv = usb_get_serial_port_data(port);
+ int status = urb->status;
+ int result;
+
+ switch (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 with status: %d\n", __func__, status);
+ priv->flags.write_urb_in_use = 0;
+ return;
+ default:
+ /* error in the urb, so we have to resubmit it */
+ dev_dbg(&urb->dev->dev, "%s(): nonzero write bulk status received: %d\n", __func__, status);
+ dev_dbg(&urb->dev->dev, "%s(): overflow in write\n", __func__);
+
+ port->write_urb->transfer_buffer_length = 1;
+ result = usb_submit_urb(port->write_urb, GFP_ATOMIC);
+ if (result) {
+ dev_err_console(port, "%s(): usb_submit_urb() failed,"
+ " error %d\n", __func__, result);
+ } else {
+ return;
+ }
+ }
+
+ priv->flags.write_urb_in_use = 0;
+
+ /* schedule the interrupt urb if we are still open */
+ dev_dbg(&port->dev, "%s(): submitting interrupt urb\n", __func__);
+ result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC);
+ if (result != 0) {
+ dev_err(&port->dev, "%s(): failed submitting int urb,"
+ " error %d\n", __func__, result);
+ }
+}
+
+module_usb_serial_driver(serial_drivers, id_table);
+
+MODULE_DESCRIPTION(OTI6858_DESCRIPTION);
+MODULE_AUTHOR(OTI6858_AUTHOR);
+MODULE_LICENSE("GPL");
Code Review / kvmfornfv.git / blobdiff