| /* |
| * 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 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 { |
| 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 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, |
| .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 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 { |
| 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)", __func__, port->number); |
| |
| if ((new_setup = kmalloc(OTI6858_CTRL_PKT_SIZE, GFP_KERNEL)) == 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 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 usb_serial_port *port) |
| { |
| 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 usb_serial_port *port) |
| { |
| 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 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)", __func__, port->number); |
| |
| if (!port->tty || !port->tty->termios) { |
| dbg("%s(): no tty structures", __func__); |
| 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; |
| port->tty->termios->c_ispeed = 38400; |
| port->tty->termios->c_ospeed = 38400; |
| } |
| 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 { |
| int real_br; |
| br = min(br, OTI6858_MAX_BAUD_RATE); |
| |
| divisor = (96000000 + 8 * br) / (16 * br); |
| real_br = 96000000 / (16 * divisor); |
| divisor = cpu_to_le16(divisor); |
| tty_encode_baud_rate(port->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 usb_serial_port *port, struct file *filp) |
| { |
| struct oti6858_private *priv = usb_get_serial_port_data(port); |
| struct ktermios tmp_termios; |
| struct usb_serial *serial = port->serial; |
| struct oti6858_control_pkt *buf; |
| unsigned long flags; |
| int result; |
| |
| dbg("%s(port = %d)", __func__, port->number); |
| |
| usb_clear_halt(serial->dev, port->write_urb->pipe); |
| usb_clear_halt(serial->dev, port->read_urb->pipe); |
| |
| if (port->open_count != 1) |
| return 0; |
| |
| if ((buf = kmalloc(OTI6858_CTRL_PKT_SIZE, GFP_KERNEL)) == 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, 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)", __func__, port->number); |
| |
| /* wait for data to drain from the buffer */ |
| spin_lock_irqsave(&priv->lock, flags); |
| timeout = 30 * HZ; /* PL2303_CLOSING_WAIT */ |
| init_waitqueue_entry(&wait, current); |
| add_wait_queue(&port->tty->write_wait, &wait); |
| dbg("%s(): entering wait loop", __func__); |
| for (;;) { |
| set_current_state(TASK_INTERRUPTIBLE); |
| if (oti6858_buf_data_avail(priv->buf) == 0 |
| || timeout == 0 || signal_pending(current) |
| || port->serial->disconnected) |
| break; |
| spin_unlock_irqrestore(&priv->lock, flags); |
| timeout = schedule_timeout(timeout); |
| spin_lock_irqsave(&priv->lock, flags); |
| } |
| set_current_state(TASK_RUNNING); |
| remove_wait_queue(&port->tty->write_wait, &wait); |
| dbg("%s(): after wait loop", __func__); |
| |
| /* clear out any remaining data in the buffer */ |
| oti6858_buf_clear(priv->buf); |
| spin_unlock_irqrestore(&priv->lock, flags); |
| |
| /* wait for characters to drain from the device */ |
| /* (this is long enough for the entire 256 byte */ |
| /* pl2303 hardware buffer to drain with no flow */ |
| /* control for data rates of 1200 bps or more, */ |
| /* for lower rates we should really know how much */ |
| /* data is in the buffer to compute a delay */ |
| /* that is not unnecessarily long) */ |
| /* FIXME |
| bps = tty_get_baud_rate(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()", __func__); |
| |
| /* cancel scheduled setup */ |
| cancel_delayed_work(&priv->delayed_setup_work); |
| cancel_delayed_work(&priv->delayed_write_work); |
| flush_scheduled_work(); |
| |
| /* shutdown our urbs */ |
| dbg("%s(): shutting down urbs", __func__); |
| usb_kill_urb(port->write_urb); |
| usb_kill_urb(port->read_urb); |
| usb_kill_urb(port->interrupt_in_urb); |
| |
| /* |
| if (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)", |
| __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 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)", __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 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)", |
| __func__, port->number, cmd, arg); |
| |
| switch (cmd) { |
| 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 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_break_ctl(struct usb_serial_port *port, int break_state) |
| { |
| int state; |
| |
| dbg("%s(port = %d)", __func__, port->number); |
| |
| state = (break_state == 0) ? 0 : 1; |
| dbg("%s(): turning break %s", __func__, 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", __func__); |
| */ |
| } |
| |
| static void oti6858_shutdown(struct usb_serial *serial) |
| { |
| struct oti6858_private *priv; |
| int i; |
| |
| dbg("%s()", __func__); |
| |
| for (i = 0; i < serial->num_ports; ++i) { |
| priv = usb_get_serial_port_data(serial->port[i]); |
| if (priv) { |
| oti6858_buf_free(priv->buf); |
| kfree(priv); |
| usb_set_serial_port_data(serial->port[i], NULL); |
| } |
| } |
| } |
| |
| static void oti6858_read_int_callback(struct urb *urb) |
| { |
| struct usb_serial_port *port = urb->context; |
| struct oti6858_private *priv = usb_get_serial_port_data(port); |
| int transient = 0, can_recv = 0, resubmit = 1; |
| int status = urb->status; |
| |
| dbg("%s(port = %d, status = %d)", |
| __func__, port->number, status); |
| |
| switch (status) { |
| case 0: |
| /* success */ |
| break; |
| case -ECONNRESET: |
| case -ENOENT: |
| case -ESHUTDOWN: |
| /* this urb is terminated, clean up */ |
| dbg("%s(): urb shutting down with status: %d", |
| __func__, status); |
| return; |
| default: |
| dbg("%s(): nonzero urb status received: %d", |
| __func__, status); |
| break; |
| } |
| |
| if (status == 0 && urb->actual_length == OTI6858_CTRL_PKT_SIZE) { |
| struct oti6858_control_pkt *xs = urb->transfer_buffer; |
| unsigned long flags; |
| |
| spin_lock_irqsave(&priv->lock, flags); |
| |
| if (!priv->transient) { |
| if (!OTI6858_CTRL_EQUALS_PENDING(xs, priv)) { |
| if (xs->rx_bytes_avail == 0) { |
| priv->transient = 4; |
| priv->setup_done = 0; |
| resubmit = 0; |
| dbg("%s(): scheduling setup_line()", |
| __func__); |
| schedule_delayed_work(&priv->delayed_setup_work, 0); |
| } |
| } |
| } else { |
| if (OTI6858_CTRL_EQUALS_PENDING(xs, priv)) { |
| priv->transient = 0; |
| } else if (!priv->setup_done) { |
| resubmit = 0; |
| } else if (--priv->transient == 0) { |
| if (xs->rx_bytes_avail == 0) { |
| priv->transient = 4; |
| priv->setup_done = 0; |
| resubmit = 0; |
| dbg("%s(): scheduling setup_line()", |
| __func__); |
| schedule_delayed_work(&priv->delayed_setup_work, 0); |
| } |
| } |
| } |
| |
| if (!priv->transient) { |
| if (xs->pin_state != priv->status.pin_state) |
| wake_up_interruptible(&priv->intr_wait); |
| memcpy(&priv->status, xs, OTI6858_CTRL_PKT_SIZE); |
| } |
| |
| if (!priv->transient && xs->rx_bytes_avail != 0) { |
| can_recv = xs->rx_bytes_avail; |
| priv->flags.read_urb_in_use = 1; |
| } |
| |
| transient = priv->transient; |
| spin_unlock_irqrestore(&priv->lock, flags); |
| } |
| |
| if (can_recv) { |
| int result; |
| |
| port->read_urb->dev = port->serial->dev; |
| result = usb_submit_urb(port->read_urb, GFP_ATOMIC); |
| if (result != 0) { |
| priv->flags.read_urb_in_use = 0; |
| dev_err(&port->dev, "%s(): usb_submit_urb() failed," |
| " error %d\n", __func__, result); |
| } else { |
| resubmit = 0; |
| } |
| } else if (!transient) { |
| unsigned long flags; |
| |
| spin_lock_irqsave(&priv->lock, flags); |
| if (priv->flags.write_urb_in_use == 0 |
| && oti6858_buf_data_avail(priv->buf) != 0) { |
| schedule_delayed_work(&priv->delayed_write_work,0); |
| resubmit = 0; |
| } |
| spin_unlock_irqrestore(&priv->lock, flags); |
| } |
| |
| if (resubmit) { |
| int result; |
| |
| // dbg("%s(): submitting interrupt urb", __func__); |
| urb->dev = port->serial->dev; |
| result = usb_submit_urb(urb, GFP_ATOMIC); |
| if (result != 0) { |
| dev_err(&urb->dev->dev, |
| "%s(): usb_submit_urb() failed with" |
| " error %d\n", __func__, result); |
| } |
| } |
| } |
| |
| static void oti6858_read_bulk_callback(struct urb *urb) |
| { |
| struct usb_serial_port *port = urb->context; |
| struct oti6858_private *priv = usb_get_serial_port_data(port); |
| struct tty_struct *tty; |
| unsigned char *data = urb->transfer_buffer; |
| unsigned long flags; |
| int status = urb->status; |
| int result; |
| |
| dbg("%s(port = %d, status = %d)", |
| __func__, port->number, status); |
| |
| spin_lock_irqsave(&priv->lock, flags); |
| priv->flags.read_urb_in_use = 0; |
| spin_unlock_irqrestore(&priv->lock, flags); |
| |
| if (status != 0) { |
| if (!port->open_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 = port->tty; |
| if (tty != NULL && urb->actual_length > 0) { |
| tty_insert_flip_string(tty, data, urb->actual_length); |
| 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", __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; |
| |
| 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"); |
| |