/* * 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 #include #include #include #include #include #include #include #include #include #include #include #include #include #include "oti6858.h" #define OTI6858_DESCRIPTION \ "Ours Technology Inc. OTi-6858 USB to serial adapter driver" #define OTI6858_AUTHOR "Tomasz Michal Lukaszewski " #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); 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 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_release(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, .release = oti6858_release, }; 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 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(port); return -EPROTO; } /* setup termios */ if (tty) oti6858_set_termios(tty, port, &tmp_termios); port->port.drain_delay = 256; /* FIXME: check the FIFO length */ return 0; } static void oti6858_close(struct usb_serial_port *port) { struct oti6858_private *priv = usb_get_serial_port_data(port); unsigned long flags; dbg("%s(port = %d)", __func__, port->number); spin_lock_irqsave(&priv->lock, flags); /* clear out any remaining data in the buffer */ oti6858_buf_clear(priv->buf); spin_unlock_irqrestore(&priv->lock, flags); dbg("%s(): after buf_clear()", __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); } 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_release(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); } } } 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");