--- /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/init.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 "oti6858.h"
+
+#define OTI6858_DESCRIPTION \
+ "Ours Technology Inc. OTi-6858 USB to serial adapter driver"
+#define OTI6858_AUTHOR "Tomasz Michal Lukaszewski <FIXME@FIXME>"
+#define OTI6858_VERSION "0.1"
+
+static struct usb_device_id id_table [] = {
+ { USB_DEVICE(OTI6858_VENDOR_ID, OTI6858_PRODUCT_ID) },
+ { }
+};
+
+MODULE_DEVICE_TABLE(usb, id_table);
+
+static struct usb_driver oti6858_driver = {
+ .name = "oti6858",
+ .probe = usb_serial_probe,
+ .disconnect = usb_serial_disconnect,
+ .id_table = id_table,
+ .no_dynamic_id = 1,
+};
+
+static int debug;
+
+
+/* buffering code, copied from pl2303 driver */
+#define PL2303_BUF_SIZE 1024
+#define PL2303_TMP_BUF_SIZE 1024
+
+struct oti6858_buf {
+ unsigned int buf_size;
+ char *buf_buf;
+ char *buf_get;
+ char *buf_put;
+};
+
+/* 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_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, struct file *filp);
+static void oti6858_close(struct tty_struct *tty,
+ struct usb_serial_port *port, struct file *filp);
+static void oti6858_set_termios(struct tty_struct *tty,
+ struct usb_serial_port *port, struct ktermios *old);
+static int oti6858_ioctl(struct tty_struct *tty, struct file *file,
+ unsigned int cmd, unsigned long arg);
+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, struct file *file);
+static int oti6858_tiocmset(struct tty_struct *tty, struct file *file,
+ unsigned int set, unsigned int clear);
+static int oti6858_startup(struct usb_serial *serial);
+static void oti6858_shutdown(struct usb_serial *serial);
+
+/* functions operating on buffers */
+static struct oti6858_buf *oti6858_buf_alloc(unsigned int size);
+static void oti6858_buf_free(struct oti6858_buf *pb);
+static void oti6858_buf_clear(struct oti6858_buf *pb);
+static unsigned int oti6858_buf_data_avail(struct oti6858_buf *pb);
+static unsigned int oti6858_buf_space_avail(struct oti6858_buf *pb);
+static unsigned int oti6858_buf_put(struct oti6858_buf *pb, const char *buf,
+ unsigned int count);
+static unsigned int oti6858_buf_get(struct oti6858_buf *pb, char *buf,
+ unsigned int count);
+
+
+/* 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,
+ .ioctl = oti6858_ioctl,
+ .set_termios = oti6858_set_termios,
+ .tiocmget = oti6858_tiocmget,
+ .tiocmset = oti6858_tiocmset,
+ .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,
+ .attach = oti6858_startup,
+ .shutdown = oti6858_shutdown,
+};
+
+struct oti6858_private {
+ spinlock_t lock;
+
+ struct oti6858_buf *buf;
+ struct oti6858_control_pkt status;
+
+ struct {
+ u8 read_urb_in_use;
+ u8 write_urb_in_use;
+ u8 termios_initialized;
+ } 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;
+
+ wait_queue_head_t intr_wait;
+ 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;
+
+ dbg("%s(port = %d)", __func__, port->number);
+
+ new_setup = kmalloc(OTI6858_CTRL_PKT_SIZE, GFP_KERNEL);
+ if (new_setup == NULL) {
+ dev_err(&port->dev, "%s(): out of memory!\n", __func__);
+ /* 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);
+
+ dbg("%s(): submitting interrupt urb", __func__);
+ port->interrupt_in_urb->dev = port->serial->dev;
+ result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC);
+ if (result != 0) {
+ dev_err(&port->dev, "%s(): usb_submit_urb() failed"
+ " with error %d\n", __func__, result);
+ }
+}
+
+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;
+ unsigned char allow;
+
+ dbg("%s(port = %d)", __func__, port->number);
+
+ 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;
+
+ count = oti6858_buf_data_avail(priv->buf);
+ spin_unlock_irqrestore(&priv->lock, flags);
+ if (count > port->bulk_out_size)
+ count = port->bulk_out_size;
+
+ if (count != 0) {
+ 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;
+ }
+
+ if (count == 0) {
+ priv->flags.write_urb_in_use = 0;
+
+ dbg("%s(): submitting interrupt urb", __func__);
+ port->interrupt_in_urb->dev = port->serial->dev;
+ result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC);
+ if (result != 0) {
+ dev_err(&port->dev, "%s(): usb_submit_urb() failed"
+ " with error %d\n", __func__, result);
+ }
+ return;
+ }
+
+ spin_lock_irqsave(&priv->lock, flags);
+ oti6858_buf_get(priv->buf, port->write_urb->transfer_buffer, count);
+ spin_unlock_irqrestore(&priv->lock, flags);
+
+ port->write_urb->transfer_buffer_length = count;
+ port->write_urb->dev = port->serial->dev;
+ result = usb_submit_urb(port->write_urb, GFP_ATOMIC);
+ if (result != 0) {
+ dev_err(&port->dev, "%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_startup(struct usb_serial *serial)
+{
+ struct usb_serial_port *port = serial->port[0];
+ struct oti6858_private *priv;
+ int i;
+
+ for (i = 0; i < serial->num_ports; ++i) {
+ priv = kzalloc(sizeof(struct oti6858_private), GFP_KERNEL);
+ if (!priv)
+ break;
+ priv->buf = oti6858_buf_alloc(PL2303_BUF_SIZE);
+ if (priv->buf == NULL) {
+ kfree(priv);
+ break;
+ }
+
+ spin_lock_init(&priv->lock);
+ init_waitqueue_head(&priv->intr_wait);
+/* INIT_WORK(&priv->setup_work, setup_line, serial->port[i]); */
+/* INIT_WORK(&priv->write_work, send_data, serial->port[i]); */
+ 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(serial->port[i], priv);
+ }
+ if (i == serial->num_ports)
+ return 0;
+
+ for (--i; i >= 0; --i) {
+ priv = usb_get_serial_port_data(serial->port[i]);
+ oti6858_buf_free(priv->buf);
+ kfree(priv);
+ usb_set_serial_port_data(serial->port[i], NULL);
+ }
+ return -ENOMEM;
+}
+
+static int oti6858_write(struct tty_struct *tty, struct usb_serial_port *port,
+ const unsigned char *buf, int count)
+{
+ struct oti6858_private *priv = usb_get_serial_port_data(port);
+ unsigned long flags;
+
+ dbg("%s(port = %d, count = %d)", __func__, port->number, count);
+
+ if (!count)
+ return count;
+
+ spin_lock_irqsave(&priv->lock, flags);
+ count = oti6858_buf_put(priv->buf, buf, count);
+ spin_unlock_irqrestore(&priv->lock, flags);
+
+ return count;
+}
+
+static int oti6858_write_room(struct tty_struct *tty)
+{
+ struct usb_serial_port *port = tty->driver_data;
+ struct oti6858_private *priv = usb_get_serial_port_data(port);
+ int room = 0;
+ unsigned long flags;
+
+ dbg("%s(port = %d)", __func__, port->number);
+
+ spin_lock_irqsave(&priv->lock, flags);
+ room = oti6858_buf_space_avail(priv->buf);
+ spin_unlock_irqrestore(&priv->lock, flags);
+
+ return room;
+}
+
+static int oti6858_chars_in_buffer(struct tty_struct *tty)
+{
+ struct usb_serial_port *port = tty->driver_data;
+ struct oti6858_private *priv = usb_get_serial_port_data(port);
+ int chars = 0;
+ unsigned long flags;
+
+ dbg("%s(port = %d)", __func__, port->number);
+
+ spin_lock_irqsave(&priv->lock, flags);
+ chars = oti6858_buf_data_avail(priv->buf);
+ spin_unlock_irqrestore(&priv->lock, flags);
+
+ return chars;
+}
+
+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;
+
+ dbg("%s(port = %d)", __func__, port->number);
+
+ if (!tty) {
+ dbg("%s(): no tty structures", __func__);
+ return;
+ }
+
+ spin_lock_irqsave(&priv->lock, flags);
+ if (!priv->flags.termios_initialized) {
+ *(tty->termios) = tty_std_termios;
+ tty->termios->c_cflag = B38400 | CS8 | CREAD | HUPCL | CLOCAL;
+ tty->termios->c_ispeed = 38400;
+ tty->termios->c_ospeed = 38400;
+ priv->flags.termios_initialized = 1;
+ }
+ spin_unlock_irqrestore(&priv->lock, flags);
+
+ 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 file *filp)
+{
+ struct oti6858_private *priv = usb_get_serial_port_data(port);
+ struct ktermios tmp_termios;
+ struct usb_serial *serial = port->serial;
+ struct oti6858_control_pkt *buf;
+ unsigned long flags;
+ int result;
+
+ dbg("%s(port = %d)", __func__, port->number);
+
+ usb_clear_halt(serial->dev, port->write_urb->pipe);
+ usb_clear_halt(serial->dev, port->read_urb->pipe);
+
+ if (port->port.count != 1)
+ return 0;
+
+ buf = kmalloc(OTI6858_CTRL_PKT_SIZE, GFP_KERNEL);
+ if (buf == NULL) {
+ dev_err(&port->dev, "%s(): out of memory!\n", __func__);
+ 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);
+
+ dbg("%s(): submitting interrupt urb", __func__);
+ port->interrupt_in_urb->dev = serial->dev;
+ 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(tty, port, NULL);
+ return -EPROTO;
+ }
+
+ /* setup termios */
+ if (tty)
+ oti6858_set_termios(tty, port, &tmp_termios);
+
+ return 0;
+}
+
+static void oti6858_close(struct tty_struct *tty,
+ struct usb_serial_port *port, struct file *filp)
+{
+ struct oti6858_private *priv = usb_get_serial_port_data(port);
+ unsigned long flags;
+ long timeout;
+ wait_queue_t wait;
+
+ dbg("%s(port = %d)", __func__, port->number);
+
+ /* wait for data to drain from the buffer */
+ spin_lock_irqsave(&priv->lock, flags);
+ timeout = 30 * HZ; /* PL2303_CLOSING_WAIT */
+ init_waitqueue_entry(&wait, current);
+ add_wait_queue(&tty->write_wait, &wait);
+ dbg("%s(): entering wait loop", __func__);
+ for (;;) {
+ set_current_state(TASK_INTERRUPTIBLE);
+ if (oti6858_buf_data_avail(priv->buf) == 0
+ || timeout == 0 || signal_pending(current)
+ || port->serial->disconnected)
+ break;
+ spin_unlock_irqrestore(&priv->lock, flags);
+ timeout = schedule_timeout(timeout);
+ spin_lock_irqsave(&priv->lock, flags);
+ }
+ set_current_state(TASK_RUNNING);
+ remove_wait_queue(&tty->write_wait, &wait);
+ dbg("%s(): after wait loop", __func__);
+
+ /* clear out any remaining data in the buffer */
+ oti6858_buf_clear(priv->buf);
+ spin_unlock_irqrestore(&priv->lock, flags);
+
+ /* wait for characters to drain from the device */
+ /* (this is long enough for the entire 256 byte */
+ /* pl2303 hardware buffer to drain with no flow */
+ /* control for data rates of 1200 bps or more, */
+ /* for lower rates we should really know how much */
+ /* data is in the buffer to compute a delay */
+ /* that is not unnecessarily long) */
+ /* FIXME
+ bps = tty_get_baud_rate(tty);
+ if (bps > 1200)
+ timeout = max((HZ*2560)/bps,HZ/10);
+ else
+ */
+ timeout = 2*HZ;
+ schedule_timeout_interruptible(timeout);
+ dbg("%s(): after schedule_timeout_interruptible()", __func__);
+
+ /* cancel scheduled setup */
+ cancel_delayed_work(&priv->delayed_setup_work);
+ cancel_delayed_work(&priv->delayed_write_work);
+ flush_scheduled_work();
+
+ /* 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 && (tty->termios->c_cflag) & HUPCL) {
+ // drop DTR and RTS
+ spin_lock_irqsave(&priv->lock, flags);
+ priv->pending_setup.control &= ~CONTROL_MASK;
+ spin_unlock_irqrestore(&priv->lock, flags);
+ }
+ */
+}
+
+static int oti6858_tiocmset(struct tty_struct *tty, struct file *file,
+ 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;
+
+ dbg("%s(port = %d, set = 0x%08x, clear = 0x%08x)",
+ __func__, port->number, set, clear);
+
+ if (!usb_get_intfdata(port->serial->interface))
+ return -ENODEV;
+
+ /* 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 file *file)
+{
+ 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;
+
+ dbg("%s(port = %d)", __func__, port->number);
+
+ if (!usb_get_intfdata(port->serial->interface))
+ return -ENODEV;
+
+ 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;
+
+ dbg("%s() = 0x%08x", __func__, result);
+
+ return result;
+}
+
+static int wait_modem_info(struct usb_serial_port *port, unsigned int arg)
+{
+ struct oti6858_private *priv = usb_get_serial_port_data(port);
+ unsigned long flags;
+ unsigned int prev, status;
+ unsigned int changed;
+
+ spin_lock_irqsave(&priv->lock, flags);
+ prev = priv->status.pin_state;
+ spin_unlock_irqrestore(&priv->lock, flags);
+
+ while (1) {
+ wait_event_interruptible(priv->intr_wait,
+ priv->status.pin_state != prev);
+ if (signal_pending(current))
+ return -ERESTARTSYS;
+
+ spin_lock_irqsave(&priv->lock, flags);
+ status = priv->status.pin_state & PIN_MASK;
+ spin_unlock_irqrestore(&priv->lock, flags);
+
+ changed = prev ^ status;
+ /* FIXME: check if this is correct (active high/low) */
+ if (((arg & TIOCM_RNG) && (changed & PIN_RI)) ||
+ ((arg & TIOCM_DSR) && (changed & PIN_DSR)) ||
+ ((arg & TIOCM_CD) && (changed & PIN_DCD)) ||
+ ((arg & TIOCM_CTS) && (changed & PIN_CTS)))
+ return 0;
+ prev = status;
+ }
+
+ /* NOTREACHED */
+ return 0;
+}
+
+static int oti6858_ioctl(struct tty_struct *tty, struct file *file,
+ unsigned int cmd, unsigned long arg)
+{
+ struct usb_serial_port *port = tty->driver_data;
+
+ dbg("%s(port = %d, cmd = 0x%04x, arg = 0x%08lx)",
+ __func__, port->number, cmd, arg);
+
+ switch (cmd) {
+ case TIOCMIWAIT:
+ dbg("%s(): TIOCMIWAIT", __func__);
+ return wait_modem_info(port, arg);
+ default:
+ dbg("%s(): 0x%04x not supported", __func__, cmd);
+ break;
+ }
+ return -ENOIOCTLCMD;
+}
+
+
+static void oti6858_shutdown(struct usb_serial *serial)
+{
+ struct oti6858_private *priv;
+ int i;
+
+ dbg("%s()", __func__);
+
+ for (i = 0; i < serial->num_ports; ++i) {
+ priv = usb_get_serial_port_data(serial->port[i]);
+ if (priv) {
+ oti6858_buf_free(priv->buf);
+ kfree(priv);
+ usb_set_serial_port_data(serial->port[i], NULL);
+ }
+ }
+}
+
+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;
+
+ dbg("%s(port = %d, status = %d)",
+ __func__, port->number, status);
+
+ switch (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__, status);
+ return;
+ default:
+ dbg("%s(): nonzero urb status received: %d",
+ __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;
+ dbg("%s(): scheduling setup_line()",
+ __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;
+ dbg("%s(): scheduling setup_line()",
+ __func__);
+ schedule_delayed_work(&priv->delayed_setup_work, 0);
+ }
+ }
+ }
+
+ if (!priv->transient) {
+ if (xs->pin_state != priv->status.pin_state)
+ wake_up_interruptible(&priv->intr_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;
+
+ port->read_urb->dev = port->serial->dev;
+ 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;
+
+ spin_lock_irqsave(&priv->lock, flags);
+ if (priv->flags.write_urb_in_use == 0
+ && oti6858_buf_data_avail(priv->buf) != 0) {
+ schedule_delayed_work(&priv->delayed_write_work, 0);
+ resubmit = 0;
+ }
+ spin_unlock_irqrestore(&priv->lock, flags);
+ }
+
+ if (resubmit) {
+ int result;
+
+/* dbg("%s(): submitting interrupt urb", __func__); */
+ urb->dev = port->serial->dev;
+ 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);
+ struct tty_struct *tty;
+ unsigned char *data = urb->transfer_buffer;
+ unsigned long flags;
+ int status = urb->status;
+ int result;
+
+ dbg("%s(port = %d, status = %d)",
+ __func__, port->number, status);
+
+ spin_lock_irqsave(&priv->lock, flags);
+ priv->flags.read_urb_in_use = 0;
+ spin_unlock_irqrestore(&priv->lock, flags);
+
+ if (status != 0) {
+ if (!port->port.count) {
+ dbg("%s(): port is closed, exiting", __func__);
+ return;
+ }
+ /*
+ if (status == -EPROTO) {
+ * PL2303 mysteriously fails with -EPROTO reschedule
+ the read *
+ dbg("%s - caught -EPROTO, resubmitting the urb",
+ __func__);
+ result = usb_submit_urb(urb, GFP_ATOMIC);
+ if (result)
+ dev_err(&urb->dev->dev, "%s - failed resubmitting read urb, error %d\n", __func__, result);
+ return;
+ }
+ */
+ dbg("%s(): unable to handle the error, exiting", __func__);
+ return;
+ }
+
+ tty = tty_port_tty_get(&port->port);
+ if (tty != NULL && urb->actual_length > 0) {
+ tty_insert_flip_string(tty, data, urb->actual_length);
+ tty_flip_buffer_push(tty);
+ }
+ tty_kref_put(tty);
+
+ /* schedule the interrupt urb if we are still open */
+ if (port->port.count != 0) {
+ port->interrupt_in_urb->dev = port->serial->dev;
+ result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC);
+ if (result != 0) {
+ 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;
+
+ dbg("%s(port = %d, status = %d)",
+ __func__, port->number, status);
+
+ switch (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__, status);
+ priv->flags.write_urb_in_use = 0;
+ return;
+ default:
+ /* error in the urb, so we have to resubmit it */
+ dbg("%s(): nonzero write bulk status received: %d",
+ __func__, status);
+ dbg("%s(): overflow in write", __func__);
+
+ port->write_urb->transfer_buffer_length = 1;
+ port->write_urb->dev = port->serial->dev;
+ result = usb_submit_urb(port->write_urb, GFP_ATOMIC);
+ if (result) {
+ dev_err(&port->dev, "%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 */
+ port->interrupt_in_urb->dev = port->serial->dev;
+ dbg("%s(): submitting interrupt urb", __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);
+ }
+}
+
+
+/*
+ * oti6858_buf_alloc
+ *
+ * Allocate a circular buffer and all associated memory.
+ */
+static struct oti6858_buf *oti6858_buf_alloc(unsigned int size)
+{
+ struct oti6858_buf *pb;
+
+ if (size == 0)
+ return NULL;
+
+ pb = kmalloc(sizeof(struct oti6858_buf), GFP_KERNEL);
+ if (pb == NULL)
+ return NULL;
+
+ pb->buf_buf = kmalloc(size, GFP_KERNEL);
+ if (pb->buf_buf == NULL) {
+ kfree(pb);
+ return NULL;
+ }
+
+ pb->buf_size = size;
+ pb->buf_get = pb->buf_put = pb->buf_buf;
+
+ return pb;
+}
+
+/*
+ * oti6858_buf_free
+ *
+ * Free the buffer and all associated memory.
+ */
+static void oti6858_buf_free(struct oti6858_buf *pb)
+{
+ if (pb) {
+ kfree(pb->buf_buf);
+ kfree(pb);
+ }
+}
+
+/*
+ * oti6858_buf_clear
+ *
+ * Clear out all data in the circular buffer.
+ */
+static void oti6858_buf_clear(struct oti6858_buf *pb)
+{
+ if (pb != NULL) {
+ /* equivalent to a get of all data available */
+ pb->buf_get = pb->buf_put;
+ }
+}
+
+/*
+ * oti6858_buf_data_avail
+ *
+ * Return the number of bytes of data available in the circular
+ * buffer.
+ */
+static unsigned int oti6858_buf_data_avail(struct oti6858_buf *pb)
+{
+ if (pb == NULL)
+ return 0;
+ return (pb->buf_size + pb->buf_put - pb->buf_get) % pb->buf_size;
+}
+
+/*
+ * oti6858_buf_space_avail
+ *
+ * Return the number of bytes of space available in the circular
+ * buffer.
+ */
+static unsigned int oti6858_buf_space_avail(struct oti6858_buf *pb)
+{
+ if (pb == NULL)
+ return 0;
+ return (pb->buf_size + pb->buf_get - pb->buf_put - 1) % pb->buf_size;
+}
+
+/*
+ * oti6858_buf_put
+ *
+ * Copy data data from a user buffer and put it into the circular buffer.
+ * Restrict to the amount of space available.
+ *
+ * Return the number of bytes copied.
+ */
+static unsigned int oti6858_buf_put(struct oti6858_buf *pb, const char *buf,
+ unsigned int count)
+{
+ unsigned int len;
+
+ if (pb == NULL)
+ return 0;
+
+ len = oti6858_buf_space_avail(pb);
+ if (count > len)
+ count = len;
+
+ if (count == 0)
+ return 0;
+
+ len = pb->buf_buf + pb->buf_size - pb->buf_put;
+ if (count > len) {
+ memcpy(pb->buf_put, buf, len);
+ memcpy(pb->buf_buf, buf+len, count - len);
+ pb->buf_put = pb->buf_buf + count - len;
+ } else {
+ memcpy(pb->buf_put, buf, count);
+ if (count < len)
+ pb->buf_put += count;
+ else /* count == len */
+ pb->buf_put = pb->buf_buf;
+ }
+
+ return count;
+}
+
+/*
+ * oti6858_buf_get
+ *
+ * Get data from the circular buffer and copy to the given buffer.
+ * Restrict to the amount of data available.
+ *
+ * Return the number of bytes copied.
+ */
+static unsigned int oti6858_buf_get(struct oti6858_buf *pb, char *buf,
+ unsigned int count)
+{
+ unsigned int len;
+
+ if (pb == NULL)
+ return 0;
+
+ len = oti6858_buf_data_avail(pb);
+ if (count > len)
+ count = len;
+
+ if (count == 0)
+ return 0;
+
+ len = pb->buf_buf + pb->buf_size - pb->buf_get;
+ if (count > len) {
+ memcpy(buf, pb->buf_get, len);
+ memcpy(buf+len, pb->buf_buf, count - len);
+ pb->buf_get = pb->buf_buf + count - len;
+ } else {
+ memcpy(buf, pb->buf_get, count);
+ if (count < len)
+ pb->buf_get += count;
+ else /* count == len */
+ pb->buf_get = pb->buf_buf;
+ }
+
+ return count;
+}
+
+/* module description and (de)initialization */
+
+static int __init oti6858_init(void)
+{
+ int retval;
+
+ retval = usb_serial_register(&oti6858_device);
+ if (retval == 0) {
+ retval = usb_register(&oti6858_driver);
+ if (retval)
+ usb_serial_deregister(&oti6858_device);
+ }
+ return retval;
+}
+
+static void __exit oti6858_exit(void)
+{
+ usb_deregister(&oti6858_driver);
+ usb_serial_deregister(&oti6858_device);
+}
+
+module_init(oti6858_init);
+module_exit(oti6858_exit);
+
+MODULE_DESCRIPTION(OTI6858_DESCRIPTION);
+MODULE_AUTHOR(OTI6858_AUTHOR);
+MODULE_VERSION(OTI6858_VERSION);
+MODULE_LICENSE("GPL");
+
+module_param(debug, bool, S_IRUGO | S_IWUSR);
+MODULE_PARM_DESC(debug, "enable debug output");
+
projects / kernel-power / blobdiff