diff options
Diffstat (limited to 'drivers/usb/serial/oti6858.c')
| -rw-r--r-- | drivers/usb/serial/oti6858.c | 847 |
1 files changed, 847 insertions, 0 deletions
diff --git a/drivers/usb/serial/oti6858.c b/drivers/usb/serial/oti6858.c new file mode 100644 index 000000000..ae9cb15ee --- /dev/null +++ b/drivers/usb/serial/oti6858.c @@ -0,0 +1,847 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * 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! + * + * 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, + .num_bulk_in = 1, + .num_bulk_out = 1, + .num_interrupt_in = 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 v2"); |