diff options
Diffstat (limited to 'drivers/usb/serial/oti6858.c')
| -rw-r--r-- | drivers/usb/serial/oti6858.c | 1342 |
1 files changed, 1342 insertions, 0 deletions
diff --git a/drivers/usb/serial/oti6858.c b/drivers/usb/serial/oti6858.c new file mode 100644 index 00000000000..d7db71eca52 --- /dev/null +++ b/drivers/usb/serial/oti6858.c @@ -0,0 +1,1342 @@ +/* + * 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 <asm/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 pl2303_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 { + u16 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 usb_serial_port *port, struct file *filp); +static void oti6858_close(struct usb_serial_port *port, struct file *filp); +static void oti6858_set_termios(struct usb_serial_port *port, + struct ktermios *old); +static int oti6858_ioctl(struct usb_serial_port *port, 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 usb_serial_port *port, + const unsigned char *buf, int count); +static int oti6858_write_room(struct usb_serial_port *port); +static void oti6858_break_ctl(struct usb_serial_port *port, int break_state); +static int oti6858_chars_in_buffer(struct usb_serial_port *port); +static int oti6858_tiocmget(struct usb_serial_port *port, struct file *file); +static int oti6858_tiocmset(struct usb_serial_port *port, 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 pl2303_buf *pl2303_buf_alloc(unsigned int size); +static void pl2303_buf_free(struct pl2303_buf *pb); +static void pl2303_buf_clear(struct pl2303_buf *pb); +static unsigned int pl2303_buf_data_avail(struct pl2303_buf *pb); +static unsigned int pl2303_buf_space_avail(struct pl2303_buf *pb); +static unsigned int pl2303_buf_put(struct pl2303_buf *pb, const char *buf, + unsigned int count); +static unsigned int pl2303_buf_get(struct pl2303_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_interrupt_in = 1, + .num_bulk_in = 1, + .num_bulk_out = 1, + .num_ports = 1, + .open = oti6858_open, + .close = oti6858_close, + .write = oti6858_write, + .ioctl = oti6858_ioctl, + .break_ctl = oti6858_break_ctl, + .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 pl2303_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 { + u16 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 */ +}; + +#undef dbg +/* #define dbg(format, arg...) printk(KERN_INFO "%s: " format "\n", __FILE__, ## arg) */ +#define dbg(format, arg...) printk(KERN_INFO "" format "\n", ## arg) + +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)", __FUNCTION__, port->number); + + if ((new_setup = kmalloc(OTI6858_CTRL_PKT_SIZE, GFP_KERNEL)) == NULL) { + dev_err(&port->dev, "%s(): out of memory!\n", __FUNCTION__); + /* 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", __FUNCTION__); + 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", __FUNCTION__); + 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", __FUNCTION__, 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)", __FUNCTION__, 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 = pl2303_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", __FUNCTION__); + 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", __FUNCTION__, result); + } + return; + } + + spin_lock_irqsave(&priv->lock, flags); + pl2303_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", __FUNCTION__, 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 = pl2303_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]); + pl2303_buf_free(priv->buf); + kfree(priv); + usb_set_serial_port_data(serial->port[i], NULL); + } + return -ENOMEM; +} + +static int oti6858_write(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)", __FUNCTION__, port->number, count); + + if (!count) + return count; + + spin_lock_irqsave(&priv->lock, flags); + count = pl2303_buf_put(priv->buf, buf, count); + spin_unlock_irqrestore(&priv->lock, flags); + + return count; +} + +static int oti6858_write_room(struct usb_serial_port *port) +{ + struct oti6858_private *priv = usb_get_serial_port_data(port); + int room = 0; + unsigned long flags; + + dbg("%s(port = %d)", __FUNCTION__, port->number); + + spin_lock_irqsave(&priv->lock, flags); + room = pl2303_buf_space_avail(priv->buf); + spin_unlock_irqrestore(&priv->lock, flags); + + return room; +} + +static int oti6858_chars_in_buffer(struct usb_serial_port *port) +{ + struct oti6858_private *priv = usb_get_serial_port_data(port); + int chars = 0; + unsigned long flags; + + dbg("%s(port = %d)", __FUNCTION__, port->number); + + spin_lock_irqsave(&priv->lock, flags); + chars = pl2303_buf_data_avail(priv->buf); + spin_unlock_irqrestore(&priv->lock, flags); + + return chars; +} + +static void oti6858_set_termios(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; + u16 divisor; + int br; + + dbg("%s(port = %d)", __FUNCTION__, port->number); + + if ((!port->tty) || (!port->tty->termios)) { + dbg("%s(): no tty structures", __FUNCTION__); + return; + } + + spin_lock_irqsave(&priv->lock, flags); + if (!priv->flags.termios_initialized) { + *(port->tty->termios) = tty_std_termios; + port->tty->termios->c_cflag = B38400 | CS8 | CREAD | HUPCL | CLOCAL; + priv->flags.termios_initialized = 1; + } + spin_unlock_irqrestore(&priv->lock, flags); + + cflag = port->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(port->tty); + if (br == 0) { + divisor = 0; + } else if (br <= OTI6858_MAX_BAUD_RATE) { + int real_br; + + divisor = (96000000 + 8 * br) / (16 * br); + real_br = 96000000 / (16 * divisor); + if ((((real_br - br) * 100 + br - 1) / br) > 2) { + dbg("%s(): baud rate %d is invalid", __FUNCTION__, br); + return; + } + divisor = cpu_to_le16(divisor); + } else { + dbg("%s(): baud rate %d is too high", __FUNCTION__, br); + return; + } + + 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 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)", __FUNCTION__, port->number); + + usb_clear_halt(serial->dev, port->write_urb->pipe); + usb_clear_halt(serial->dev, port->read_urb->pipe); + + if (port->open_count != 1) + return 0; + + if ((buf = kmalloc(OTI6858_CTRL_PKT_SIZE, GFP_KERNEL)) == NULL) { + dev_err(&port->dev, "%s(): out of memory!\n", __FUNCTION__); + 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", __FUNCTION__); + 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", __FUNCTION__, result); + oti6858_close(port, NULL); + return -EPROTO; + } + + /* setup termios */ + if (port->tty) + oti6858_set_termios(port, &tmp_termios); + + return 0; +} + +static void oti6858_close(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)", __FUNCTION__, 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(&port->tty->write_wait, &wait); + dbg("%s(): entering wait loop", __FUNCTION__); + for (;;) { + set_current_state(TASK_INTERRUPTIBLE); + if (pl2303_buf_data_avail(priv->buf) == 0 + || timeout == 0 || signal_pending(current) + || !usb_get_intfdata(port->serial->interface)) /* disconnect */ + 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(&port->tty->write_wait, &wait); + dbg("%s(): after wait loop", __FUNCTION__); + + /* clear out any remaining data in the buffer */ + pl2303_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(port->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()", __FUNCTION__); + + /* 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", __FUNCTION__); + usb_kill_urb(port->write_urb); + usb_kill_urb(port->read_urb); + usb_kill_urb(port->interrupt_in_urb); + + /* + if (port->tty && (port->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 usb_serial_port *port, struct file *file, + unsigned int set, unsigned int clear) +{ + 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)", + __FUNCTION__, 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 usb_serial_port *port, struct file *file) +{ + struct oti6858_private *priv = usb_get_serial_port_data(port); + unsigned long flags; + unsigned pin_state; + unsigned result = 0; + + dbg("%s(port = %d)", __FUNCTION__, 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", __FUNCTION__, 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 usb_serial_port *port, struct file *file, + unsigned int cmd, unsigned long arg) +{ + void __user *user_arg = (void __user *) arg; + unsigned int x; + + dbg("%s(port = %d, cmd = 0x%04x, arg = 0x%08lx)", + __FUNCTION__, port->number, cmd, arg); + + switch (cmd) { + case TCGETS: + if (copy_to_user(user_arg, port->tty->termios, + sizeof(struct ktermios))) { + return -EFAULT; + } + return 0; + + case TCSETS: + case TCSETSW: /* FIXME: this is not the same! */ + case TCSETSF: /* FIXME: this is not the same! */ + if (copy_from_user(port->tty->termios, user_arg, + sizeof(struct ktermios))) { + return -EFAULT; + } + oti6858_set_termios(port, NULL); + return 0; + + case TCFLSH: + /* FIXME */ + return 0; + + case TIOCMBIS: + if (copy_from_user(&x, user_arg, sizeof(x))) + return -EFAULT; + return oti6858_tiocmset(port, NULL, x, 0); + + case TIOCMBIC: + if (copy_from_user(&x, user_arg, sizeof(x))) + return -EFAULT; + return oti6858_tiocmset(port, NULL, 0, x); + + case TIOCGSERIAL: + if (copy_to_user(user_arg, port->tty->termios, + sizeof(struct ktermios))) { + return -EFAULT; + } + return 0; + + case TIOCSSERIAL: + if (copy_from_user(port->tty->termios, user_arg, + sizeof(struct ktermios))) { + return -EFAULT; + } + oti6858_set_termios(port, NULL); + return 0; + + case TIOCMIWAIT: + dbg("%s(): TIOCMIWAIT", __FUNCTION__); + return wait_modem_info(port, arg); + + default: + dbg("%s(): 0x%04x not supported", __FUNCTION__, cmd); + break; + } + + return -ENOIOCTLCMD; +} + +static void oti6858_break_ctl(struct usb_serial_port *port, int break_state) +{ + int state; + + dbg("%s(port = %d)", __FUNCTION__, port->number); + + state = (break_state == 0) ? 0 : 1; + dbg("%s(): turning break %s", __FUNCTION__, state ? "on" : "off"); + + /* FIXME */ +/* + result = usb_control_msg (serial->dev, usb_sndctrlpipe (serial->dev, 0), + BREAK_REQUEST, BREAK_REQUEST_TYPE, state, + 0, NULL, 0, 100); + if (result != 0) + dbg("%s(): error sending break", __FUNCTION__); + */ +} + +static void oti6858_shutdown(struct usb_serial *serial) +{ + struct oti6858_private *priv; + int i; + + dbg("%s()", __FUNCTION__); + + for (i = 0; i < serial->num_ports; ++i) { + priv = usb_get_serial_port_data(serial->port[i]); + if (priv) { + pl2303_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 = (struct usb_serial_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)", + __FUNCTION__, 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", + __FUNCTION__, status); + return; + default: + dbg("%s(): nonzero urb status received: %d", + __FUNCTION__, 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()", + __FUNCTION__); + 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()", + __FUNCTION__); + 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", __FUNCTION__, result); + } else { + resubmit = 0; + } + } else if (!transient) { + unsigned long flags; + + spin_lock_irqsave(&priv->lock, flags); + if (priv->flags.write_urb_in_use == 0 + && pl2303_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", __FUNCTION__); + 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", __FUNCTION__, result); + } + } +} + +static void oti6858_read_bulk_callback(struct urb *urb) +{ + struct usb_serial_port *port = (struct usb_serial_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 i, result; + int status = urb->status; + char tty_flag; + + dbg("%s(port = %d, status = %d)", + __FUNCTION__, 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->open_count) { + dbg("%s(): port is closed, exiting", __FUNCTION__); + return; + } + /* + if (status == -EPROTO) { + // PL2303 mysteriously fails with -EPROTO reschedule the read + dbg("%s - caught -EPROTO, resubmitting the urb", __FUNCTION__); + result = usb_submit_urb(urb, GFP_ATOMIC); + if (result) + dev_err(&urb->dev->dev, "%s - failed resubmitting read urb, error %d\n", __FUNCTION__, result); + return; + } + */ + dbg("%s(): unable to handle the error, exiting", __FUNCTION__); + return; + } + + // get tty_flag from status + tty_flag = TTY_NORMAL; + +/* FIXME: probably, errors will be signalled using interrupt pipe! */ +/* + // break takes precedence over parity, + // which takes precedence over framing errors + if (status & UART_BREAK_ERROR ) + tty_flag = TTY_BREAK; + else if (status & UART_PARITY_ERROR) + tty_flag = TTY_PARITY; + else if (status & UART_FRAME_ERROR) + tty_flag = TTY_FRAME; + dbg("%s - tty_flag = %d", __FUNCTION__, tty_flag); +*/ + + tty = port->tty; + if (tty != NULL && urb->actual_length > 0) { + tty_buffer_request_room(tty, urb->actual_length); + for (i = 0; i < urb->actual_length; ++i) + tty_insert_flip_char(tty, data[i], tty_flag); + tty_flip_buffer_push(tty); + } + + // schedule the interrupt urb if we are still open */ + if (port->open_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", __FUNCTION__, result); + } + } +} + +static void oti6858_write_bulk_callback(struct urb *urb) +{ + struct usb_serial_port *port = (struct usb_serial_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)", + __FUNCTION__, 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", + __FUNCTION__, 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", + __FUNCTION__, status); + dbg("%s(): overflow in write", __FUNCTION__); + + 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", __FUNCTION__, 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", __FUNCTION__); + 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", __FUNCTION__, result); + } +} + + +/* + * pl2303_buf_alloc + * + * Allocate a circular buffer and all associated memory. + */ +static struct pl2303_buf *pl2303_buf_alloc(unsigned int size) +{ + struct pl2303_buf *pb; + + if (size == 0) + return NULL; + + pb = (struct pl2303_buf *)kmalloc(sizeof(struct pl2303_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; +} + +/* + * pl2303_buf_free + * + * Free the buffer and all associated memory. + */ +static void pl2303_buf_free(struct pl2303_buf *pb) +{ + if (pb) { + kfree(pb->buf_buf); + kfree(pb); + } +} + +/* + * pl2303_buf_clear + * + * Clear out all data in the circular buffer. + */ +static void pl2303_buf_clear(struct pl2303_buf *pb) +{ + if (pb != NULL) { + /* equivalent to a get of all data available */ + pb->buf_get = pb->buf_put; + } +} + +/* + * pl2303_buf_data_avail + * + * Return the number of bytes of data available in the circular + * buffer. + */ +static unsigned int pl2303_buf_data_avail(struct pl2303_buf *pb) +{ + if (pb == NULL) + return 0; + return ((pb->buf_size + pb->buf_put - pb->buf_get) % pb->buf_size); +} + +/* + * pl2303_buf_space_avail + * + * Return the number of bytes of space available in the circular + * buffer. + */ +static unsigned int pl2303_buf_space_avail(struct pl2303_buf *pb) +{ + if (pb == NULL) + return 0; + return ((pb->buf_size + pb->buf_get - pb->buf_put - 1) % pb->buf_size); +} + +/* + * pl2303_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 pl2303_buf_put(struct pl2303_buf *pb, const char *buf, + unsigned int count) +{ + unsigned int len; + + if (pb == NULL) + return 0; + + len = pl2303_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; +} + +/* + * pl2303_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 pl2303_buf_get(struct pl2303_buf *pb, char *buf, + unsigned int count) +{ + unsigned int len; + + if (pb == NULL) + return 0; + + len = pl2303_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; + + if ((retval = usb_serial_register(&oti6858_device)) == 0) { + if ((retval = usb_register(&oti6858_driver)) != 0) + usb_serial_deregister(&oti6858_device); + else + return 0; + } + + 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"); + |