Orange Pi5 kernel

// SPDX-License-Identifier: GPL-2.0
/*
 * Ours Technology Inc. OTi-6858 USB to serial adapter driver.
 *
 * Copyleft  (C) 2007 Kees Lemmens (adapted for kernel 2.6.20)
 * Copyright (C) 2006 Tomasz Michal Lukaszewski (FIXME: add e-mail)
 * Copyright (C) 2001-2004 Greg Kroah-Hartman (greg@kroah.com)
 * Copyright (C) 2003 IBM Corp.
 *
 * Many thanks to the authors of pl2303 driver: all functions in this file
 * are heavily based on pl2303 code, buffering code is a 1-to-1 copy.
 *
 * Warning! You use this driver on your own risk! The only official
 * description of this device I have is datasheet from manufacturer,
 * and it doesn't contain almost any information needed to write a driver.
 * Almost all knowlegde used while writing this driver was gathered by:
 *  - analyzing traffic between device and the M$ Windows 2000 driver,
 *  - trying different bit combinations and checking pin states
 *    with a voltmeter,
 *  - receiving malformed frames and producing buffer overflows
 *    to learn how errors are reported,
 * So, THIS CODE CAN DESTROY OTi-6858 AND ANY OTHER DEVICES, THAT ARE
 * CONNECTED TO IT!
 *
 * See Documentation/usb/usb-serial.rst for more information on using this
 * driver
 *
 * TODO:
 *  - implement correct flushing for ioctls and oti6858_close()
 *  - check how errors (rx overflow, parity error, framing error) are reported
 *  - implement oti6858_break_ctl()
 *  - implement more ioctls
 *  - test/implement flow control
 *  - allow setting custom baud rates
 */
 
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/slab.h>
#include <linux/tty.h>
#include <linux/tty_driver.h>
#include <linux/tty_flip.h>
#include <linux/serial.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/spinlock.h>
#include <linux/usb.h>
#include <linux/usb/serial.h>
#include <linux/uaccess.h>
#include <linux/kfifo.h>
#include "oti6858.h"
 
#define OTI6858_DESCRIPTION \
<------>"Ours Technology Inc. OTi-6858 USB to serial adapter driver"
#define OTI6858_AUTHOR "Tomasz Michal Lukaszewski <FIXME@FIXME>"
 
static const struct usb_device_id id_table[] = {
<------>{ USB_DEVICE(OTI6858_VENDOR_ID, OTI6858_PRODUCT_ID) },
<------>{ }
};
 
MODULE_DEVICE_TABLE(usb, id_table);
 
/* requests */
#define	OTI6858_REQ_GET_STATUS		(USB_DIR_IN | USB_TYPE_VENDOR | 0x00)
#define	OTI6858_REQ_T_GET_STATUS	0x01
 
#define	OTI6858_REQ_SET_LINE		(USB_DIR_OUT | USB_TYPE_VENDOR | 0x00)
#define	OTI6858_REQ_T_SET_LINE		0x00
 
#define	OTI6858_REQ_CHECK_TXBUFF	(USB_DIR_IN | USB_TYPE_VENDOR | 0x01)
#define	OTI6858_REQ_T_CHECK_TXBUFF	0x00
 
/* format of the control packet */
struct oti6858_control_pkt {
<------>__le16	divisor;	/* baud rate = 96000000 / (16 * divisor), LE */
#define OTI6858_MAX_BAUD_RATE	3000000
<------>u8	frame_fmt;
#define FMT_STOP_BITS_MASK	0xc0
#define FMT_STOP_BITS_1		0x00
#define FMT_STOP_BITS_2		0x40	/* 1.5 stop bits if FMT_DATA_BITS_5 */
#define FMT_PARITY_MASK		0x38
#define FMT_PARITY_NONE		0x00
#define FMT_PARITY_ODD		0x08
#define FMT_PARITY_EVEN		0x18
#define FMT_PARITY_MARK		0x28
#define FMT_PARITY_SPACE	0x38
#define FMT_DATA_BITS_MASK	0x03
#define FMT_DATA_BITS_5		0x00
#define FMT_DATA_BITS_6		0x01
#define FMT_DATA_BITS_7		0x02
#define FMT_DATA_BITS_8		0x03
<------>u8	something;	/* always equals 0x43 */
<------>u8	control;	/* settings of flow control lines */
#define CONTROL_MASK		0x0c
#define CONTROL_DTR_HIGH	0x08
#define CONTROL_RTS_HIGH	0x04
<------>u8	tx_status;
#define	TX_BUFFER_EMPTIED	0x09
<------>u8	pin_state;
#define PIN_MASK		0x3f
#define PIN_MSR_MASK		0x1b
#define PIN_RTS			0x20	/* output pin */
#define PIN_CTS			0x10	/* input pin, active low */
#define PIN_DSR			0x08	/* input pin, active low */
#define PIN_DTR			0x04	/* output pin */
#define PIN_RI			0x02	/* input pin, active low */
#define PIN_DCD			0x01	/* input pin, active low */
<------>u8	rx_bytes_avail;		/* number of bytes in rx buffer */;
};
 
#define OTI6858_CTRL_PKT_SIZE	sizeof(struct oti6858_control_pkt)
#define OTI6858_CTRL_EQUALS_PENDING(a, priv) \
<------>(((a)->divisor == (priv)->pending_setup.divisor) \
<------>  && ((a)->control == (priv)->pending_setup.control) \
<------>  && ((a)->frame_fmt == (priv)->pending_setup.frame_fmt))
 
/* function prototypes */
static int oti6858_open(struct tty_struct *tty, struct usb_serial_port *port);
static void oti6858_close(struct usb_serial_port *port);
static void oti6858_set_termios(struct tty_struct *tty,
<------><------><------>struct usb_serial_port *port, struct ktermios *old);
static void oti6858_init_termios(struct tty_struct *tty);
static void oti6858_read_int_callback(struct urb *urb);
static void oti6858_read_bulk_callback(struct urb *urb);
static void oti6858_write_bulk_callback(struct urb *urb);
static int oti6858_write(struct tty_struct *tty, struct usb_serial_port *port,
<------><------><------>const unsigned char *buf, int count);
static int oti6858_write_room(struct tty_struct *tty);
static int oti6858_chars_in_buffer(struct tty_struct *tty);
static int oti6858_tiocmget(struct tty_struct *tty);
static int oti6858_tiocmset(struct tty_struct *tty,
<------><------><------><------>unsigned int set, unsigned int clear);
static int oti6858_port_probe(struct usb_serial_port *port);
static int oti6858_port_remove(struct usb_serial_port *port);
 
/* device info */
static struct usb_serial_driver oti6858_device = {
<------>.driver = {
<------><------>.owner =	THIS_MODULE,
<------><------>.name =		"oti6858",
<------>},
<------>.id_table =		id_table,
<------>.num_ports =		1,
<------>.num_bulk_in =		1,
<------>.num_bulk_out =		1,
<------>.num_interrupt_in =	1,
<------>.open =			oti6858_open,
<------>.close =		oti6858_close,
<------>.write =		oti6858_write,
<------>.set_termios =		oti6858_set_termios,
<------>.init_termios = 	oti6858_init_termios,
<------>.tiocmget =		oti6858_tiocmget,
<------>.tiocmset =		oti6858_tiocmset,
<------>.tiocmiwait =		usb_serial_generic_tiocmiwait,
<------>.read_bulk_callback =	oti6858_read_bulk_callback,
<------>.read_int_callback =	oti6858_read_int_callback,
<------>.write_bulk_callback =	oti6858_write_bulk_callback,
<------>.write_room =		oti6858_write_room,
<------>.chars_in_buffer =	oti6858_chars_in_buffer,
<------>.port_probe =		oti6858_port_probe,
<------>.port_remove =		oti6858_port_remove,
};
 
static struct usb_serial_driver * const serial_drivers[] = {
<------>&oti6858_device, NULL
};
 
struct oti6858_private {
<------>spinlock_t lock;
 
<------>struct oti6858_control_pkt status;
 
<------>struct {
<------><------>u8 read_urb_in_use;
<------><------>u8 write_urb_in_use;
<------>} flags;
<------>struct delayed_work delayed_write_work;
 
<------>struct {
<------><------>__le16 divisor;
<------><------>u8 frame_fmt;
<------><------>u8 control;
<------>} pending_setup;
<------>u8 transient;
<------>u8 setup_done;
<------>struct delayed_work delayed_setup_work;
 
<------>struct usb_serial_port *port;   /* USB port with which associated */
};
 
static void setup_line(struct work_struct *work)
{
<------>struct oti6858_private *priv = container_of(work,
<------><------><------>struct oti6858_private, delayed_setup_work.work);
<------>struct usb_serial_port *port = priv->port;
<------>struct oti6858_control_pkt *new_setup;
<------>unsigned long flags;
<------>int result;
 
<------>new_setup = kmalloc(OTI6858_CTRL_PKT_SIZE, GFP_KERNEL);
<------>if (!new_setup) {
<------><------>/* we will try again */
<------><------>schedule_delayed_work(&priv->delayed_setup_work,
<------><------><------><------><------><------>msecs_to_jiffies(2));
<------><------>return;
<------>}
 
<------>result = usb_control_msg(port->serial->dev,
<------><------><------><------>usb_rcvctrlpipe(port->serial->dev, 0),
<------><------><------><------>OTI6858_REQ_T_GET_STATUS,
<------><------><------><------>OTI6858_REQ_GET_STATUS,
<------><------><------><------>0, 0,
<------><------><------><------>new_setup, OTI6858_CTRL_PKT_SIZE,
<------><------><------><------>100);
 
<------>if (result != OTI6858_CTRL_PKT_SIZE) {
<------><------>dev_err(&port->dev, "%s(): error reading status\n", __func__);
<------><------>kfree(new_setup);
<------><------>/* we will try again */
<------><------>schedule_delayed_work(&priv->delayed_setup_work,
<------><------><------><------><------><------><------>msecs_to_jiffies(2));
<------><------>return;
<------>}
 
<------>spin_lock_irqsave(&priv->lock, flags);
<------>if (!OTI6858_CTRL_EQUALS_PENDING(new_setup, priv)) {
<------><------>new_setup->divisor = priv->pending_setup.divisor;
<------><------>new_setup->control = priv->pending_setup.control;
<------><------>new_setup->frame_fmt = priv->pending_setup.frame_fmt;
 
<------><------>spin_unlock_irqrestore(&priv->lock, flags);
<------><------>result = usb_control_msg(port->serial->dev,
<------><------><------><------><------>usb_sndctrlpipe(port->serial->dev, 0),
<------><------><------><------><------>OTI6858_REQ_T_SET_LINE,
<------><------><------><------><------>OTI6858_REQ_SET_LINE,
<------><------><------><------><------>0, 0,
<------><------><------><------><------>new_setup, OTI6858_CTRL_PKT_SIZE,
<------><------><------><------><------>100);
<------>} else {
<------><------>spin_unlock_irqrestore(&priv->lock, flags);
<------><------>result = 0;
<------>}
<------>kfree(new_setup);
 
<------>spin_lock_irqsave(&priv->lock, flags);
<------>if (result != OTI6858_CTRL_PKT_SIZE)
<------><------>priv->transient = 0;
<------>priv->setup_done = 1;
<------>spin_unlock_irqrestore(&priv->lock, flags);
 
<------>dev_dbg(&port->dev, "%s(): submitting interrupt urb\n", __func__);
<------>result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
<------>if (result != 0) {
<------><------>dev_err(&port->dev, "%s(): usb_submit_urb() failed with error %d\n",
<------><------><------>__func__, result);
<------>}
}
 
static void send_data(struct work_struct *work)
{
<------>struct oti6858_private *priv = container_of(work,
<------><------><------>struct oti6858_private, delayed_write_work.work);
<------>struct usb_serial_port *port = priv->port;
<------>int count = 0, result;
<------>unsigned long flags;
<------>u8 *allow;
 
<------>spin_lock_irqsave(&priv->lock, flags);
<------>if (priv->flags.write_urb_in_use) {
<------><------>spin_unlock_irqrestore(&priv->lock, flags);
<------><------>schedule_delayed_work(&priv->delayed_write_work,
<------><------><------><------><------><------>msecs_to_jiffies(2));
<------><------>return;
<------>}
<------>priv->flags.write_urb_in_use = 1;
<------>spin_unlock_irqrestore(&priv->lock, flags);
 
<------>spin_lock_irqsave(&port->lock, flags);
<------>count = kfifo_len(&port->write_fifo);
<------>spin_unlock_irqrestore(&port->lock, flags);
 
<------>if (count > port->bulk_out_size)
<------><------>count = port->bulk_out_size;
 
<------>if (count != 0) {
<------><------>allow = kmalloc(1, GFP_KERNEL);
<------><------>if (!allow)
<------><------><------>return;
 
<------><------>result = usb_control_msg(port->serial->dev,
<------><------><------><------>usb_rcvctrlpipe(port->serial->dev, 0),
<------><------><------><------>OTI6858_REQ_T_CHECK_TXBUFF,
<------><------><------><------>OTI6858_REQ_CHECK_TXBUFF,
<------><------><------><------>count, 0, allow, 1, 100);
<------><------>if (result != 1 || *allow != 0)
<------><------><------>count = 0;
<------><------>kfree(allow);
<------>}
 
<------>if (count == 0) {
<------><------>priv->flags.write_urb_in_use = 0;
 
<------><------>dev_dbg(&port->dev, "%s(): submitting interrupt urb\n", __func__);
<------><------>result = usb_submit_urb(port->interrupt_in_urb, GFP_NOIO);
<------><------>if (result != 0) {
<------><------><------>dev_err(&port->dev, "%s(): usb_submit_urb() failed with error %d\n",
<------><------><------><------>__func__, result);
<------><------>}
<------><------>return;
<------>}
 
<------>count = kfifo_out_locked(&port->write_fifo,
<------><------><------><------><------>port->write_urb->transfer_buffer,
<------><------><------><------><------>count, &port->lock);
<------>port->write_urb->transfer_buffer_length = count;
<------>result = usb_submit_urb(port->write_urb, GFP_NOIO);
<------>if (result != 0) {
<------><------>dev_err_console(port, "%s(): usb_submit_urb() failed with error %d\n",
<------><------><------><------>__func__, result);
<------><------>priv->flags.write_urb_in_use = 0;
<------>}
 
<------>usb_serial_port_softint(port);
}
 
static int oti6858_port_probe(struct usb_serial_port *port)
{
<------>struct oti6858_private *priv;
 
<------>priv = kzalloc(sizeof(*priv), GFP_KERNEL);
<------>if (!priv)
<------><------>return -ENOMEM;
 
<------>spin_lock_init(&priv->lock);
<------>priv->port = port;
<------>INIT_DELAYED_WORK(&priv->delayed_setup_work, setup_line);
<------>INIT_DELAYED_WORK(&priv->delayed_write_work, send_data);
 
<------>usb_set_serial_port_data(port, priv);
 
<------>port->port.drain_delay = 256;	/* FIXME: check the FIFO length */
 
<------>return 0;
}
 
static int oti6858_port_remove(struct usb_serial_port *port)
{
<------>struct oti6858_private *priv;
 
<------>priv = usb_get_serial_port_data(port);
<------>kfree(priv);
 
<------>return 0;
}
 
static int oti6858_write(struct tty_struct *tty, struct usb_serial_port *port,
<------><------><------>const unsigned char *buf, int count)
{
<------>if (!count)
<------><------>return count;
 
<------>count = kfifo_in_locked(&port->write_fifo, buf, count, &port->lock);
 
<------>return count;
}
 
static int oti6858_write_room(struct tty_struct *tty)
{
<------>struct usb_serial_port *port = tty->driver_data;
<------>int room = 0;
<------>unsigned long flags;
 
<------>spin_lock_irqsave(&port->lock, flags);
<------>room = kfifo_avail(&port->write_fifo);
<------>spin_unlock_irqrestore(&port->lock, flags);
 
<------>return room;
}
 
static int oti6858_chars_in_buffer(struct tty_struct *tty)
{
<------>struct usb_serial_port *port = tty->driver_data;
<------>int chars = 0;
<------>unsigned long flags;
 
<------>spin_lock_irqsave(&port->lock, flags);
<------>chars = kfifo_len(&port->write_fifo);
<------>spin_unlock_irqrestore(&port->lock, flags);
 
<------>return chars;
}
 
static void oti6858_init_termios(struct tty_struct *tty)
{
<------>tty_encode_baud_rate(tty, 38400, 38400);
}
 
static void oti6858_set_termios(struct tty_struct *tty,
<------><------>struct usb_serial_port *port, struct ktermios *old_termios)
{
<------>struct oti6858_private *priv = usb_get_serial_port_data(port);
<------>unsigned long flags;
<------>unsigned int cflag;
<------>u8 frame_fmt, control;
<------>__le16 divisor;
<------>int br;
 
<------>cflag = tty->termios.c_cflag;
 
<------>spin_lock_irqsave(&priv->lock, flags);
<------>divisor = priv->pending_setup.divisor;
<------>frame_fmt = priv->pending_setup.frame_fmt;
<------>control = priv->pending_setup.control;
<------>spin_unlock_irqrestore(&priv->lock, flags);
 
<------>frame_fmt &= ~FMT_DATA_BITS_MASK;
<------>switch (cflag & CSIZE) {
<------>case CS5:
<------><------>frame_fmt |= FMT_DATA_BITS_5;
<------><------>break;
<------>case CS6:
<------><------>frame_fmt |= FMT_DATA_BITS_6;
<------><------>break;
<------>case CS7:
<------><------>frame_fmt |= FMT_DATA_BITS_7;
<------><------>break;
<------>default:
<------>case CS8:
<------><------>frame_fmt |= FMT_DATA_BITS_8;
<------><------>break;
<------>}
 
<------>/* manufacturer claims that this device can work with baud rates
<------> * up to 3 Mbps; I've tested it only on 115200 bps, so I can't
<------> * guarantee that any other baud rate will work (especially
<------> * the higher ones)
<------> */
<------>br = tty_get_baud_rate(tty);
<------>if (br == 0) {
<------><------>divisor = 0;
<------>} else {
<------><------>int real_br;
<------><------>int new_divisor;
<------><------>br = min(br, OTI6858_MAX_BAUD_RATE);
 
<------><------>new_divisor = (96000000 + 8 * br) / (16 * br);
<------><------>real_br = 96000000 / (16 * new_divisor);
<------><------>divisor = cpu_to_le16(new_divisor);
<------><------>tty_encode_baud_rate(tty, real_br, real_br);
<------>}
 
<------>frame_fmt &= ~FMT_STOP_BITS_MASK;
<------>if ((cflag & CSTOPB) != 0)
<------><------>frame_fmt |= FMT_STOP_BITS_2;
<------>else
<------><------>frame_fmt |= FMT_STOP_BITS_1;
 
<------>frame_fmt &= ~FMT_PARITY_MASK;
<------>if ((cflag & PARENB) != 0) {
<------><------>if ((cflag & PARODD) != 0)
<------><------><------>frame_fmt |= FMT_PARITY_ODD;
<------><------>else
<------><------><------>frame_fmt |= FMT_PARITY_EVEN;
<------>} else {
<------><------>frame_fmt |= FMT_PARITY_NONE;
<------>}
 
<------>control &= ~CONTROL_MASK;
<------>if ((cflag & CRTSCTS) != 0)
<------><------>control |= (CONTROL_DTR_HIGH | CONTROL_RTS_HIGH);
 
<------>/* change control lines if we are switching to or from B0 */
<------>/* FIXME:
<------>spin_lock_irqsave(&priv->lock, flags);
<------>control = priv->line_control;
<------>if ((cflag & CBAUD) == B0)
<------><------>priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS);
<------>else
<------><------>priv->line_control |= (CONTROL_DTR | CONTROL_RTS);
<------>if (control != priv->line_control) {
<------><------>control = priv->line_control;
<------><------>spin_unlock_irqrestore(&priv->lock, flags);
<------><------>set_control_lines(serial->dev, control);
<------>} else {
<------><------>spin_unlock_irqrestore(&priv->lock, flags);
<------>}
<------>*/
 
<------>spin_lock_irqsave(&priv->lock, flags);
<------>if (divisor != priv->pending_setup.divisor
<------><------><------>|| control != priv->pending_setup.control
<------><------><------>|| frame_fmt != priv->pending_setup.frame_fmt) {
<------><------>priv->pending_setup.divisor = divisor;
<------><------>priv->pending_setup.control = control;
<------><------>priv->pending_setup.frame_fmt = frame_fmt;
<------>}
<------>spin_unlock_irqrestore(&priv->lock, flags);
}
 
static int oti6858_open(struct tty_struct *tty, struct usb_serial_port *port)
{
<------>struct oti6858_private *priv = usb_get_serial_port_data(port);
<------>struct usb_serial *serial = port->serial;
<------>struct oti6858_control_pkt *buf;
<------>unsigned long flags;
<------>int result;
 
<------>usb_clear_halt(serial->dev, port->write_urb->pipe);
<------>usb_clear_halt(serial->dev, port->read_urb->pipe);
 
<------>buf = kmalloc(OTI6858_CTRL_PKT_SIZE, GFP_KERNEL);
<------>if (!buf)
<------><------>return -ENOMEM;
 
<------>result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
<------><------><------><------>OTI6858_REQ_T_GET_STATUS,
<------><------><------><------>OTI6858_REQ_GET_STATUS,
<------><------><------><------>0, 0,
<------><------><------><------>buf, OTI6858_CTRL_PKT_SIZE,
<------><------><------><------>100);
<------>if (result != OTI6858_CTRL_PKT_SIZE) {
<------><------>/* assume default (after power-on reset) values */
<------><------>buf->divisor = cpu_to_le16(0x009c);	/* 38400 bps */
<------><------>buf->frame_fmt = 0x03;	/* 8N1 */
<------><------>buf->something = 0x43;
<------><------>buf->control = 0x4c;	/* DTR, RTS */
<------><------>buf->tx_status = 0x00;
<------><------>buf->pin_state = 0x5b;	/* RTS, CTS, DSR, DTR, RI, DCD */
<------><------>buf->rx_bytes_avail = 0x00;
<------>}
 
<------>spin_lock_irqsave(&priv->lock, flags);
<------>memcpy(&priv->status, buf, OTI6858_CTRL_PKT_SIZE);
<------>priv->pending_setup.divisor = buf->divisor;
<------>priv->pending_setup.frame_fmt = buf->frame_fmt;
<------>priv->pending_setup.control = buf->control;
<------>spin_unlock_irqrestore(&priv->lock, flags);
<------>kfree(buf);
 
<------>dev_dbg(&port->dev, "%s(): submitting interrupt urb\n", __func__);
<------>result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
<------>if (result != 0) {
<------><------>dev_err(&port->dev, "%s(): usb_submit_urb() failed with error %d\n",
<------><------><------>__func__, result);
<------><------>oti6858_close(port);
<------><------>return result;
<------>}
 
<------>/* setup termios */
<------>if (tty)
<------><------>oti6858_set_termios(tty, port, NULL);
 
<------>return 0;
}
 
static void oti6858_close(struct usb_serial_port *port)
{
<------>struct oti6858_private *priv = usb_get_serial_port_data(port);
<------>unsigned long flags;
 
<------>spin_lock_irqsave(&port->lock, flags);
<------>/* clear out any remaining data in the buffer */
<------>kfifo_reset_out(&port->write_fifo);
<------>spin_unlock_irqrestore(&port->lock, flags);
 
<------>dev_dbg(&port->dev, "%s(): after buf_clear()\n", __func__);
 
<------>/* cancel scheduled setup */
<------>cancel_delayed_work_sync(&priv->delayed_setup_work);
<------>cancel_delayed_work_sync(&priv->delayed_write_work);
 
<------>/* shutdown our urbs */
<------>dev_dbg(&port->dev, "%s(): shutting down urbs\n", __func__);
<------>usb_kill_urb(port->write_urb);
<------>usb_kill_urb(port->read_urb);
<------>usb_kill_urb(port->interrupt_in_urb);
}
 
static int oti6858_tiocmset(struct tty_struct *tty,
<------><------><------><------>unsigned int set, unsigned int clear)
{
<------>struct usb_serial_port *port = tty->driver_data;
<------>struct oti6858_private *priv = usb_get_serial_port_data(port);
<------>unsigned long flags;
<------>u8 control;
 
<------>dev_dbg(&port->dev, "%s(set = 0x%08x, clear = 0x%08x)\n",
<------><------>__func__, set, clear);
 
<------>/* FIXME: check if this is correct (active high/low) */
<------>spin_lock_irqsave(&priv->lock, flags);
<------>control = priv->pending_setup.control;
<------>if ((set & TIOCM_RTS) != 0)
<------><------>control |= CONTROL_RTS_HIGH;
<------>if ((set & TIOCM_DTR) != 0)
<------><------>control |= CONTROL_DTR_HIGH;
<------>if ((clear & TIOCM_RTS) != 0)
<------><------>control &= ~CONTROL_RTS_HIGH;
<------>if ((clear & TIOCM_DTR) != 0)
<------><------>control &= ~CONTROL_DTR_HIGH;
 
<------>if (control != priv->pending_setup.control)
<------><------>priv->pending_setup.control = control;
 
<------>spin_unlock_irqrestore(&priv->lock, flags);
<------>return 0;
}
 
static int oti6858_tiocmget(struct tty_struct *tty)
{
<------>struct usb_serial_port *port = tty->driver_data;
<------>struct oti6858_private *priv = usb_get_serial_port_data(port);
<------>unsigned long flags;
<------>unsigned pin_state;
<------>unsigned result = 0;
 
<------>spin_lock_irqsave(&priv->lock, flags);
<------>pin_state = priv->status.pin_state & PIN_MASK;
<------>spin_unlock_irqrestore(&priv->lock, flags);
 
<------>/* FIXME: check if this is correct (active high/low) */
<------>if ((pin_state & PIN_RTS) != 0)
<------><------>result |= TIOCM_RTS;
<------>if ((pin_state & PIN_CTS) != 0)
<------><------>result |= TIOCM_CTS;
<------>if ((pin_state & PIN_DSR) != 0)
<------><------>result |= TIOCM_DSR;
<------>if ((pin_state & PIN_DTR) != 0)
<------><------>result |= TIOCM_DTR;
<------>if ((pin_state & PIN_RI) != 0)
<------><------>result |= TIOCM_RI;
<------>if ((pin_state & PIN_DCD) != 0)
<------><------>result |= TIOCM_CD;
 
<------>dev_dbg(&port->dev, "%s() = 0x%08x\n", __func__, result);
 
<------>return result;
}
 
static void oti6858_read_int_callback(struct urb *urb)
{
<------>struct usb_serial_port *port =  urb->context;
<------>struct oti6858_private *priv = usb_get_serial_port_data(port);
<------>int transient = 0, can_recv = 0, resubmit = 1;
<------>int status = urb->status;
 
<------>switch (status) {
<------>case 0:
<------><------>/* success */
<------><------>break;
<------>case -ECONNRESET:
<------>case -ENOENT:
<------>case -ESHUTDOWN:
<------><------>/* this urb is terminated, clean up */
<------><------>dev_dbg(&urb->dev->dev, "%s(): urb shutting down with status: %d\n",
<------><------><------>__func__, status);
<------><------>return;
<------>default:
<------><------>dev_dbg(&urb->dev->dev, "%s(): nonzero urb status received: %d\n",
<------><------><------>__func__, status);
<------><------>break;
<------>}
 
<------>if (status == 0 && urb->actual_length == OTI6858_CTRL_PKT_SIZE) {
<------><------>struct oti6858_control_pkt *xs = urb->transfer_buffer;
<------><------>unsigned long flags;
 
<------><------>spin_lock_irqsave(&priv->lock, flags);
 
<------><------>if (!priv->transient) {
<------><------><------>if (!OTI6858_CTRL_EQUALS_PENDING(xs, priv)) {
<------><------><------><------>if (xs->rx_bytes_avail == 0) {
<------><------><------><------><------>priv->transient = 4;
<------><------><------><------><------>priv->setup_done = 0;
<------><------><------><------><------>resubmit = 0;
<------><------><------><------><------>dev_dbg(&port->dev, "%s(): scheduling setup_line()\n", __func__);
<------><------><------><------><------>schedule_delayed_work(&priv->delayed_setup_work, 0);
<------><------><------><------>}
<------><------><------>}
<------><------>} else {
<------><------><------>if (OTI6858_CTRL_EQUALS_PENDING(xs, priv)) {
<------><------><------><------>priv->transient = 0;
<------><------><------>} else if (!priv->setup_done) {
<------><------><------><------>resubmit = 0;
<------><------><------>} else if (--priv->transient == 0) {
<------><------><------><------>if (xs->rx_bytes_avail == 0) {
<------><------><------><------><------>priv->transient = 4;
<------><------><------><------><------>priv->setup_done = 0;
<------><------><------><------><------>resubmit = 0;
<------><------><------><------><------>dev_dbg(&port->dev, "%s(): scheduling setup_line()\n", __func__);
<------><------><------><------><------>schedule_delayed_work(&priv->delayed_setup_work, 0);
<------><------><------><------>}
<------><------><------>}
<------><------>}
 
<------><------>if (!priv->transient) {
<------><------><------>u8 delta = xs->pin_state ^ priv->status.pin_state;
 
<------><------><------>if (delta & PIN_MSR_MASK) {
<------><------><------><------>if (delta & PIN_CTS)
<------><------><------><------><------>port->icount.cts++;
<------><------><------><------>if (delta & PIN_DSR)
<------><------><------><------><------>port->icount.dsr++;
<------><------><------><------>if (delta & PIN_RI)
<------><------><------><------><------>port->icount.rng++;
<------><------><------><------>if (delta & PIN_DCD)
<------><------><------><------><------>port->icount.dcd++;
 
<------><------><------><------>wake_up_interruptible(&port->port.delta_msr_wait);
<------><------><------>}
 
<------><------><------>memcpy(&priv->status, xs, OTI6858_CTRL_PKT_SIZE);
<------><------>}
 
<------><------>if (!priv->transient && xs->rx_bytes_avail != 0) {
<------><------><------>can_recv = xs->rx_bytes_avail;
<------><------><------>priv->flags.read_urb_in_use = 1;
<------><------>}
 
<------><------>transient = priv->transient;
<------><------>spin_unlock_irqrestore(&priv->lock, flags);
<------>}
 
<------>if (can_recv) {
<------><------>int result;
 
<------><------>result = usb_submit_urb(port->read_urb, GFP_ATOMIC);
<------><------>if (result != 0) {
<------><------><------>priv->flags.read_urb_in_use = 0;
<------><------><------>dev_err(&port->dev, "%s(): usb_submit_urb() failed,"
<------><------><------><------><------>" error %d\n", __func__, result);
<------><------>} else {
<------><------><------>resubmit = 0;
<------><------>}
<------>} else if (!transient) {
<------><------>unsigned long flags;
<------><------>int count;
 
<------><------>spin_lock_irqsave(&port->lock, flags);
<------><------>count = kfifo_len(&port->write_fifo);
<------><------>spin_unlock_irqrestore(&port->lock, flags);
 
<------><------>spin_lock_irqsave(&priv->lock, flags);
<------><------>if (priv->flags.write_urb_in_use == 0 && count != 0) {
<------><------><------>schedule_delayed_work(&priv->delayed_write_work, 0);
<------><------><------>resubmit = 0;
<------><------>}
<------><------>spin_unlock_irqrestore(&priv->lock, flags);
<------>}
 
<------>if (resubmit) {
<------><------>int result;
 
/*		dev_dbg(&urb->dev->dev, "%s(): submitting interrupt urb\n", __func__); */
<------><------>result = usb_submit_urb(urb, GFP_ATOMIC);
<------><------>if (result != 0) {
<------><------><------>dev_err(&urb->dev->dev,
<------><------><------><------><------>"%s(): usb_submit_urb() failed with"
<------><------><------><------><------>" error %d\n", __func__, result);
<------><------>}
<------>}
}
 
static void oti6858_read_bulk_callback(struct urb *urb)
{
<------>struct usb_serial_port *port =  urb->context;
<------>struct oti6858_private *priv = usb_get_serial_port_data(port);
<------>unsigned char *data = urb->transfer_buffer;
<------>unsigned long flags;
<------>int status = urb->status;
<------>int result;
 
<------>spin_lock_irqsave(&priv->lock, flags);
<------>priv->flags.read_urb_in_use = 0;
<------>spin_unlock_irqrestore(&priv->lock, flags);
 
<------>if (status != 0) {
<------><------>dev_dbg(&urb->dev->dev, "%s(): unable to handle the error, exiting\n", __func__);
<------><------>return;
<------>}
 
<------>if (urb->actual_length > 0) {
<------><------>tty_insert_flip_string(&port->port, data, urb->actual_length);
<------><------>tty_flip_buffer_push(&port->port);
<------>}
 
<------>/* schedule the interrupt urb */
<------>result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC);
<------>if (result != 0 && result != -EPERM) {
<------><------>dev_err(&port->dev, "%s(): usb_submit_urb() failed,"
<------><------><------><------>" error %d\n", __func__, result);
<------>}
}
 
static void oti6858_write_bulk_callback(struct urb *urb)
{
<------>struct usb_serial_port *port =  urb->context;
<------>struct oti6858_private *priv = usb_get_serial_port_data(port);
<------>int status = urb->status;
<------>int result;
 
<------>switch (status) {
<------>case 0:
<------><------>/* success */
<------><------>break;
<------>case -ECONNRESET:
<------>case -ENOENT:
<------>case -ESHUTDOWN:
<------><------>/* this urb is terminated, clean up */
<------><------>dev_dbg(&urb->dev->dev, "%s(): urb shutting down with status: %d\n", __func__, status);
<------><------>priv->flags.write_urb_in_use = 0;
<------><------>return;
<------>default:
<------><------>/* error in the urb, so we have to resubmit it */
<------><------>dev_dbg(&urb->dev->dev, "%s(): nonzero write bulk status received: %d\n", __func__, status);
<------><------>dev_dbg(&urb->dev->dev, "%s(): overflow in write\n", __func__);
 
<------><------>port->write_urb->transfer_buffer_length = 1;
<------><------>result = usb_submit_urb(port->write_urb, GFP_ATOMIC);
<------><------>if (result) {
<------><------><------>dev_err_console(port, "%s(): usb_submit_urb() failed,"
<------><------><------><------><------>" error %d\n", __func__, result);
<------><------>} else {
<------><------><------>return;
<------><------>}
<------>}
 
<------>priv->flags.write_urb_in_use = 0;
 
<------>/* schedule the interrupt urb if we are still open */
<------>dev_dbg(&port->dev, "%s(): submitting interrupt urb\n", __func__);
<------>result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC);
<------>if (result != 0) {
<------><------>dev_err(&port->dev, "%s(): failed submitting int urb,"
<------><------><------><------><------>" error %d\n", __func__, result);
<------>}
}
 
module_usb_serial_driver(serial_drivers, id_table);
 
MODULE_DESCRIPTION(OTI6858_DESCRIPTION);
MODULE_AUTHOR(OTI6858_AUTHOR);
MODULE_LICENSE("GPL v2");