drivers/usb/serial/f81232.c - kernel/msm-4.19 - Gitiles

 /*
  * Fintek F81232 USB to serial adaptor driver
  *
  * Copyright (C) 2012 Greg Kroah-Hartman (gregkh@linuxfoundation.org)
  * Copyright (C) 2012 Linux Foundation
  *
  * This program is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License version 2 as published by
  * the Free Software Foundation.
  *
  */

 #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/mutex.h>
 #include <linux/uaccess.h>
 #include <linux/usb.h>
 #include <linux/usb/serial.h>
 #include <linux/serial_reg.h>

 static const struct usb_device_id id_table[] = {
 	{ USB_DEVICE(0x1934, 0x0706) },
 	{ }					/* Terminating entry */
 };
 MODULE_DEVICE_TABLE(usb, id_table);

 /* Maximum baudrate for F81232 */
 #define F81232_MAX_BAUDRATE	115200

 /* USB Control EP parameter */
 #define F81232_REGISTER_REQUEST	0xa0
 #define F81232_GET_REGISTER		0xc0
 #define F81232_SET_REGISTER		0x40

 #define SERIAL_BASE_ADDRESS			0x0120
 #define RECEIVE_BUFFER_REGISTER		(0x00 + SERIAL_BASE_ADDRESS)
 #define INTERRUPT_ENABLE_REGISTER	(0x01 + SERIAL_BASE_ADDRESS)
 #define FIFO_CONTROL_REGISTER		(0x02 + SERIAL_BASE_ADDRESS)
 #define LINE_CONTROL_REGISTER		(0x03 + SERIAL_BASE_ADDRESS)
 #define MODEM_CONTROL_REGISTER		(0x04 + SERIAL_BASE_ADDRESS)
 #define MODEM_STATUS_REGISTER		(0x06 + SERIAL_BASE_ADDRESS)

 struct f81232_private {
 	struct mutex lock;
 	u8 modem_control;
 	u8 modem_status;
 	struct work_struct interrupt_work;
 	struct usb_serial_port *port;
 };

 static int calc_baud_divisor(speed_t baudrate)
 {
 	return DIV_ROUND_CLOSEST(F81232_MAX_BAUDRATE, baudrate);
 }

 static int f81232_get_register(struct usb_serial_port *port, u16 reg, u8 *val)
 {
 	int status;
 	u8 *tmp;
 	struct usb_device *dev = port->serial->dev;

 	tmp = kmalloc(sizeof(*val), GFP_KERNEL);
 	if (!tmp)
 		return -ENOMEM;

 	status = usb_control_msg(dev,
 				usb_rcvctrlpipe(dev, 0),
 				F81232_REGISTER_REQUEST,
 				F81232_GET_REGISTER,
 				reg,
 				0,
 				tmp,
 				sizeof(*val),
 				USB_CTRL_GET_TIMEOUT);
 	if (status != sizeof(*val)) {
 		dev_err(&port->dev, "%s failed status: %d\n", __func__, status);

 		if (status < 0)
 			status = usb_translate_errors(status);
 		else
 			status = -EIO;
 	} else {
 		status = 0;
 		*val = *tmp;
 	}

 	kfree(tmp);
 	return status;
 }

 static int f81232_set_register(struct usb_serial_port *port, u16 reg, u8 val)
 {
 	int status;
 	u8 *tmp;
 	struct usb_device *dev = port->serial->dev;

 	tmp = kmalloc(sizeof(val), GFP_KERNEL);
 	if (!tmp)
 		return -ENOMEM;

 	*tmp = val;

 	status = usb_control_msg(dev,
 				usb_sndctrlpipe(dev, 0),
 				F81232_REGISTER_REQUEST,
 				F81232_SET_REGISTER,
 				reg,
 				0,
 				tmp,
 				sizeof(val),
 				USB_CTRL_SET_TIMEOUT);
 	if (status != sizeof(val)) {
 		dev_err(&port->dev, "%s failed status: %d\n", __func__, status);

 		if (status < 0)
 			status = usb_translate_errors(status);
 		else
 			status = -EIO;
 	} else {
 		status = 0;
 	}

 	kfree(tmp);
 	return status;
 }

 static void f81232_read_msr(struct usb_serial_port *port)
 {
 	int status;
 	u8 current_msr;
 	struct tty_struct *tty;
 	struct f81232_private *priv = usb_get_serial_port_data(port);

 	mutex_lock(&priv->lock);
 	status = f81232_get_register(port, MODEM_STATUS_REGISTER,
 			&current_msr);
 	if (status) {
 		dev_err(&port->dev, "%s fail, status: %d\n", __func__, status);
 		mutex_unlock(&priv->lock);
 		return;
 	}

 	if (!(current_msr & UART_MSR_ANY_DELTA)) {
 		mutex_unlock(&priv->lock);
 		return;
 	}

 	priv->modem_status = current_msr;

 	if (current_msr & UART_MSR_DCTS)
 		port->icount.cts++;
 	if (current_msr & UART_MSR_DDSR)
 		port->icount.dsr++;
 	if (current_msr & UART_MSR_TERI)
 		port->icount.rng++;
 	if (current_msr & UART_MSR_DDCD) {
 		port->icount.dcd++;
 		tty = tty_port_tty_get(&port->port);
 		if (tty) {
 			usb_serial_handle_dcd_change(port, tty,
 					current_msr & UART_MSR_DCD);

 			tty_kref_put(tty);
 		}
 	}

 	wake_up_interruptible(&port->port.delta_msr_wait);
 	mutex_unlock(&priv->lock);
 }

 static int f81232_set_mctrl(struct usb_serial_port *port,
 					   unsigned int set, unsigned int clear)
 {
 	u8 val;
 	int status;
 	struct f81232_private *priv = usb_get_serial_port_data(port);

 	if (((set | clear) & (TIOCM_DTR | TIOCM_RTS)) == 0)
 		return 0;	/* no change */

 	/* 'set' takes precedence over 'clear' */
 	clear &= ~set;

 	/* force enable interrupt with OUT2 */
 	mutex_lock(&priv->lock);
 	val = UART_MCR_OUT2 | priv->modem_control;

 	if (clear & TIOCM_DTR)
 		val &= ~UART_MCR_DTR;

 	if (clear & TIOCM_RTS)
 		val &= ~UART_MCR_RTS;

 	if (set & TIOCM_DTR)
 		val |= UART_MCR_DTR;

 	if (set & TIOCM_RTS)
 		val |= UART_MCR_RTS;

 	dev_dbg(&port->dev, "%s new:%02x old:%02x\n", __func__,
 			val, priv->modem_control);

 	status = f81232_set_register(port, MODEM_CONTROL_REGISTER, val);
 	if (status) {
 		dev_err(&port->dev, "%s set MCR status < 0\n", __func__);
 		mutex_unlock(&priv->lock);
 		return status;
 	}

 	priv->modem_control = val;
 	mutex_unlock(&priv->lock);

 	return 0;
 }

 static void f81232_update_line_status(struct usb_serial_port *port,
 				      unsigned char *data,
 				      size_t actual_length)
 {
 	struct f81232_private *priv = usb_get_serial_port_data(port);

 	if (!actual_length)
 		return;

 	switch (data[0] & 0x07) {
 	case 0x00: /* msr change */
 		dev_dbg(&port->dev, "IIR: MSR Change: %02x\n", data[0]);
 		schedule_work(&priv->interrupt_work);
 		break;
 	case 0x02: /* tx-empty */
 		break;
 	case 0x04: /* rx data available */
 		break;
 	case 0x06: /* lsr change */
 		/* we can forget it. the LSR will read from bulk-in */
 		dev_dbg(&port->dev, "IIR: LSR Change: %02x\n", data[0]);
 		break;
 	}
 }

 static void f81232_read_int_callback(struct urb *urb)
 {
 	struct usb_serial_port *port =  urb->context;
 	unsigned char *data = urb->transfer_buffer;
 	unsigned int actual_length = urb->actual_length;
 	int status = urb->status;
 	int retval;

 	switch (status) {
 	case 0:
 		/* success */
 		break;
 	case -ECONNRESET:
 	case -ENOENT:
 	case -ESHUTDOWN:
 		/* this urb is terminated, clean up */
 		dev_dbg(&port->dev, "%s - urb shutting down with status: %d\n",
 			__func__, status);
 		return;
 	default:
 		dev_dbg(&port->dev, "%s - nonzero urb status received: %d\n",
 			__func__, status);
 		goto exit;
 	}

 	usb_serial_debug_data(&port->dev, __func__,
 			      urb->actual_length, urb->transfer_buffer);

 	f81232_update_line_status(port, data, actual_length);

 exit:
 	retval = usb_submit_urb(urb, GFP_ATOMIC);
 	if (retval)
 		dev_err(&urb->dev->dev,
 			"%s - usb_submit_urb failed with result %d\n",
 			__func__, retval);
 }

 static void f81232_process_read_urb(struct urb *urb)
 {
 	struct usb_serial_port *port = urb->context;
 	unsigned char *data = urb->transfer_buffer;
 	char tty_flag;
 	unsigned int i;
 	u8 lsr;

 	/*
 	 * When opening the port we get a 1-byte packet with the current LSR,
 	 * which we discard.
 	 */
 	if ((urb->actual_length < 2) || (urb->actual_length % 2))
 		return;

 	/* bulk-in data: [LSR(1Byte)+DATA(1Byte)][LSR(1Byte)+DATA(1Byte)]... */

 	for (i = 0; i < urb->actual_length; i += 2) {
 		tty_flag = TTY_NORMAL;
 		lsr = data[i];

 		if (lsr & UART_LSR_BRK_ERROR_BITS) {
 			if (lsr & UART_LSR_BI) {
 				tty_flag = TTY_BREAK;
 				port->icount.brk++;
 				usb_serial_handle_break(port);
 			} else if (lsr & UART_LSR_PE) {
 				tty_flag = TTY_PARITY;
 				port->icount.parity++;
 			} else if (lsr & UART_LSR_FE) {
 				tty_flag = TTY_FRAME;
 				port->icount.frame++;
 			}

 			if (lsr & UART_LSR_OE) {
 				port->icount.overrun++;
 				tty_insert_flip_char(&port->port, 0,
 						TTY_OVERRUN);
 			}
 		}

 		if (port->port.console && port->sysrq) {
 			if (usb_serial_handle_sysrq_char(port, data[i + 1]))
 				continue;
 		}

 		tty_insert_flip_char(&port->port, data[i + 1], tty_flag);
 	}

 	tty_flip_buffer_push(&port->port);
 }

 static void f81232_break_ctl(struct tty_struct *tty, int break_state)
 {
 	/* FIXME - Stubbed out for now */

 	/*
 	 * break_state = -1 to turn on break, and 0 to turn off break
 	 * see drivers/char/tty_io.c to see it used.
 	 * last_set_data_urb_value NEVER has the break bit set in it.
 	 */
 }

 static void f81232_set_baudrate(struct usb_serial_port *port, speed_t baudrate)
 {
 	u8 lcr;
 	int divisor, status = 0;

 	divisor = calc_baud_divisor(baudrate);

 	status = f81232_get_register(port, LINE_CONTROL_REGISTER,
 			 &lcr); /* get LCR */
 	if (status) {
 		dev_err(&port->dev, "%s failed to get LCR: %d\n",
 			__func__, status);
 		return;
 	}

 	status = f81232_set_register(port, LINE_CONTROL_REGISTER,
 			 lcr | UART_LCR_DLAB); /* Enable DLAB */
 	if (status) {
 		dev_err(&port->dev, "%s failed to set DLAB: %d\n",
 			__func__, status);
 		return;
 	}

 	status = f81232_set_register(port, RECEIVE_BUFFER_REGISTER,
 			 divisor & 0x00ff); /* low */
 	if (status) {
 		dev_err(&port->dev, "%s failed to set baudrate MSB: %d\n",
 			__func__, status);
 		goto reapply_lcr;
 	}

 	status = f81232_set_register(port, INTERRUPT_ENABLE_REGISTER,
 			 (divisor & 0xff00) >> 8); /* high */
 	if (status) {
 		dev_err(&port->dev, "%s failed to set baudrate LSB: %d\n",
 			__func__, status);
 	}

 reapply_lcr:
 	status = f81232_set_register(port, LINE_CONTROL_REGISTER,
 			lcr & ~UART_LCR_DLAB);
 	if (status) {
 		dev_err(&port->dev, "%s failed to set DLAB: %d\n",
 			__func__, status);
 	}
 }

 static int f81232_port_enable(struct usb_serial_port *port)
 {
 	u8 val;
 	int status;

 	/* fifo on, trigger8, clear TX/RX*/
 	val = UART_FCR_TRIGGER_8 | UART_FCR_ENABLE_FIFO | UART_FCR_CLEAR_RCVR |
 			UART_FCR_CLEAR_XMIT;

 	status = f81232_set_register(port, FIFO_CONTROL_REGISTER, val);
 	if (status) {
 		dev_err(&port->dev, "%s failed to set FCR: %d\n",
 			__func__, status);
 		return status;
 	}

 	/* MSR Interrupt only, LSR will read from Bulk-in odd byte */
 	status = f81232_set_register(port, INTERRUPT_ENABLE_REGISTER,
 			UART_IER_MSI);
 	if (status) {
 		dev_err(&port->dev, "%s failed to set IER: %d\n",
 			__func__, status);
 		return status;
 	}

 	return 0;
 }

 static int f81232_port_disable(struct usb_serial_port *port)
 {
 	int status;

 	status = f81232_set_register(port, INTERRUPT_ENABLE_REGISTER, 0);
 	if (status) {
 		dev_err(&port->dev, "%s failed to set IER: %d\n",
 			__func__, status);
 		return status;
 	}

 	return 0;
 }

 static void f81232_set_termios(struct tty_struct *tty,
 		struct usb_serial_port *port, struct ktermios *old_termios)
 {
 	u8 new_lcr = 0;
 	int status = 0;
 	speed_t baudrate;

 	/* Don't change anything if nothing has changed */
 	if (old_termios && !tty_termios_hw_change(&tty->termios, old_termios))
 		return;

 	if (C_BAUD(tty) == B0)
 		f81232_set_mctrl(port, 0, TIOCM_DTR | TIOCM_RTS);
 	else if (old_termios && (old_termios->c_cflag & CBAUD) == B0)
 		f81232_set_mctrl(port, TIOCM_DTR | TIOCM_RTS, 0);

 	baudrate = tty_get_baud_rate(tty);
 	if (baudrate > 0) {
 		if (baudrate > F81232_MAX_BAUDRATE) {
 			baudrate = F81232_MAX_BAUDRATE;
 			tty_encode_baud_rate(tty, baudrate, baudrate);
 		}
 		f81232_set_baudrate(port, baudrate);
 	}

 	if (C_PARENB(tty)) {
 		new_lcr |= UART_LCR_PARITY;

 		if (!C_PARODD(tty))
 			new_lcr |= UART_LCR_EPAR;

 		if (C_CMSPAR(tty))
 			new_lcr |= UART_LCR_SPAR;
 	}

 	if (C_CSTOPB(tty))
 		new_lcr |= UART_LCR_STOP;

 	switch (C_CSIZE(tty)) {
 	case CS5:
 		new_lcr |= UART_LCR_WLEN5;
 		break;
 	case CS6:
 		new_lcr |= UART_LCR_WLEN6;
 		break;
 	case CS7:
 		new_lcr |= UART_LCR_WLEN7;
 		break;
 	default:
 	case CS8:
 		new_lcr |= UART_LCR_WLEN8;
 		break;
 	}

 	status = f81232_set_register(port, LINE_CONTROL_REGISTER, new_lcr);
 	if (status) {
 		dev_err(&port->dev, "%s failed to set LCR: %d\n",
 			__func__, status);
 	}
 }

 static int f81232_tiocmget(struct tty_struct *tty)
 {
 	int r;
 	struct usb_serial_port *port = tty->driver_data;
 	struct f81232_private *port_priv = usb_get_serial_port_data(port);
 	u8 mcr, msr;

 	/* force get current MSR changed state */
 	f81232_read_msr(port);

 	mutex_lock(&port_priv->lock);
 	mcr = port_priv->modem_control;
 	msr = port_priv->modem_status;
 	mutex_unlock(&port_priv->lock);

 	r = (mcr & UART_MCR_DTR ? TIOCM_DTR : 0) |
 		(mcr & UART_MCR_RTS ? TIOCM_RTS : 0) |
 		(msr & UART_MSR_CTS ? TIOCM_CTS : 0) |
 		(msr & UART_MSR_DCD ? TIOCM_CAR : 0) |
 		(msr & UART_MSR_RI ? TIOCM_RI : 0) |
 		(msr & UART_MSR_DSR ? TIOCM_DSR : 0);

 	return r;
 }

 static int f81232_tiocmset(struct tty_struct *tty,
 			unsigned int set, unsigned int clear)
 {
 	struct usb_serial_port *port = tty->driver_data;

 	return f81232_set_mctrl(port, set, clear);
 }

 static int f81232_open(struct tty_struct *tty, struct usb_serial_port *port)
 {
 	int result;

 	result = f81232_port_enable(port);
 	if (result)
 		return result;

 	/* Setup termios */
 	if (tty)
 		f81232_set_termios(tty, port, NULL);

 	result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
 	if (result) {
 		dev_err(&port->dev, "%s - failed submitting interrupt urb,"
 			" error %d\n", __func__, result);
 		return result;
 	}

 	result = usb_serial_generic_open(tty, port);
 	if (result) {
 		usb_kill_urb(port->interrupt_in_urb);
 		return result;
 	}

 	return 0;
 }

 static void f81232_close(struct usb_serial_port *port)
 {
 	f81232_port_disable(port);
 	usb_serial_generic_close(port);
 	usb_kill_urb(port->interrupt_in_urb);
 }

 static void f81232_dtr_rts(struct usb_serial_port *port, int on)
 {
 	if (on)
 		f81232_set_mctrl(port, TIOCM_DTR | TIOCM_RTS, 0);
 	else
 		f81232_set_mctrl(port, 0, TIOCM_DTR | TIOCM_RTS);
 }

 static int f81232_carrier_raised(struct usb_serial_port *port)
 {
 	u8 msr;
 	struct f81232_private *priv = usb_get_serial_port_data(port);

 	mutex_lock(&priv->lock);
 	msr = priv->modem_status;
 	mutex_unlock(&priv->lock);

 	if (msr & UART_MSR_DCD)
 		return 1;
 	return 0;
 }

 static int f81232_get_serial_info(struct usb_serial_port *port,
 		unsigned long arg)
 {
 	struct serial_struct ser;

 	memset(&ser, 0, sizeof(ser));

 	ser.type = PORT_16550A;
 	ser.line = port->minor;
 	ser.port = port->port_number;
 	ser.baud_base = F81232_MAX_BAUDRATE;

 	if (copy_to_user((void __user *)arg, &ser, sizeof(ser)))
 		return -EFAULT;

 	return 0;
 }

 static int f81232_ioctl(struct tty_struct *tty,
 			unsigned int cmd, unsigned long arg)
 {
 	struct usb_serial_port *port = tty->driver_data;

 	switch (cmd) {
 	case TIOCGSERIAL:
 		return f81232_get_serial_info(port, arg);
 	default:
 		break;
 	}
 	return -ENOIOCTLCMD;
 }

 static void  f81232_interrupt_work(struct work_struct *work)
 {
 	struct f81232_private *priv =
 		container_of(work, struct f81232_private, interrupt_work);

 	f81232_read_msr(priv->port);
 }

 static int f81232_port_probe(struct usb_serial_port *port)
 {
 	struct f81232_private *priv;

 	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
 	if (!priv)
 		return -ENOMEM;

 	mutex_init(&priv->lock);
 	INIT_WORK(&priv->interrupt_work,  f81232_interrupt_work);

 	usb_set_serial_port_data(port, priv);

 	port->port.drain_delay = 256;
 	priv->port = port;

 	return 0;
 }

 static int f81232_port_remove(struct usb_serial_port *port)
 {
 	struct f81232_private *priv;

 	priv = usb_get_serial_port_data(port);
 	kfree(priv);

 	return 0;
 }

 static struct usb_serial_driver f81232_device = {
 	.driver = {
 		.owner =	THIS_MODULE,
 		.name =		"f81232",
 	},
 	.id_table =		id_table,
 	.num_ports =		1,
 	.bulk_in_size =		256,
 	.bulk_out_size =	256,
 	.open =			f81232_open,
 	.close =		f81232_close,
 	.dtr_rts = 		f81232_dtr_rts,
 	.carrier_raised =	f81232_carrier_raised,
 	.ioctl =		f81232_ioctl,
 	.break_ctl =		f81232_break_ctl,
 	.set_termios =		f81232_set_termios,
 	.tiocmget =		f81232_tiocmget,
 	.tiocmset =		f81232_tiocmset,
 	.tiocmiwait =		usb_serial_generic_tiocmiwait,
 	.process_read_urb =	f81232_process_read_urb,
 	.read_int_callback =	f81232_read_int_callback,
 	.port_probe =		f81232_port_probe,
 	.port_remove =		f81232_port_remove,
 };

 static struct usb_serial_driver * const serial_drivers[] = {
 	&f81232_device,
 	NULL,
 };

 module_usb_serial_driver(serial_drivers, id_table);

 MODULE_DESCRIPTION("Fintek F81232 USB to serial adaptor driver");
 MODULE_AUTHOR("Greg Kroah-Hartman <gregkh@linuxfoundation.org>");
 MODULE_AUTHOR("Peter Hong <peter_hong@fintek.com.tw>");
 MODULE_LICENSE("GPL v2");
	/*
	* Fintek F81232 USB to serial adaptor driver
	*
	* Copyright (C) 2012 Greg Kroah-Hartman (gregkh@linuxfoundation.org)
	* Copyright (C) 2012 Linux Foundation
	*
	* This program is free software; you can redistribute it and/or modify it
	* under the terms of the GNU General Public License version 2 as published by
	* the Free Software Foundation.
	*
	*/

	#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/mutex.h>
	#include <linux/uaccess.h>
	#include <linux/usb.h>
	#include <linux/usb/serial.h>
	#include <linux/serial_reg.h>

	static const struct usb_device_id id_table[] = {
	{ USB_DEVICE(0x1934, 0x0706) },
	{ } /* Terminating entry */
	};
	MODULE_DEVICE_TABLE(usb, id_table);

	/* Maximum baudrate for F81232 */
	#define F81232_MAX_BAUDRATE 115200

	/* USB Control EP parameter */
	#define F81232_REGISTER_REQUEST 0xa0
	#define F81232_GET_REGISTER 0xc0
	#define F81232_SET_REGISTER 0x40

	#define SERIAL_BASE_ADDRESS 0x0120
	#define RECEIVE_BUFFER_REGISTER (0x00 + SERIAL_BASE_ADDRESS)
	#define INTERRUPT_ENABLE_REGISTER (0x01 + SERIAL_BASE_ADDRESS)
	#define FIFO_CONTROL_REGISTER (0x02 + SERIAL_BASE_ADDRESS)
	#define LINE_CONTROL_REGISTER (0x03 + SERIAL_BASE_ADDRESS)
	#define MODEM_CONTROL_REGISTER (0x04 + SERIAL_BASE_ADDRESS)
	#define MODEM_STATUS_REGISTER (0x06 + SERIAL_BASE_ADDRESS)

	struct f81232_private {
	struct mutex lock;
	u8 modem_control;
	u8 modem_status;
	struct work_struct interrupt_work;
	struct usb_serial_port *port;
	};

	static int calc_baud_divisor(speed_t baudrate)
	{
	return DIV_ROUND_CLOSEST(F81232_MAX_BAUDRATE, baudrate);
	}

	static int f81232_get_register(struct usb_serial_port port, u16 reg, u8 val)
	{
	int status;
	u8 *tmp;
	struct usb_device *dev = port->serial->dev;

	tmp = kmalloc(sizeof(*val), GFP_KERNEL);
	if (!tmp)
	return -ENOMEM;

	status = usb_control_msg(dev,
	usb_rcvctrlpipe(dev, 0),
	F81232_REGISTER_REQUEST,
	F81232_GET_REGISTER,
	reg,
	0,
	tmp,
	sizeof(*val),
	USB_CTRL_GET_TIMEOUT);
	if (status != sizeof(*val)) {
	dev_err(&port->dev, "%s failed status: %d\n", __func__, status);

	if (status < 0)
	status = usb_translate_errors(status);
	else
	status = -EIO;
	} else {
	status = 0;
	val = tmp;
	}

	kfree(tmp);
	return status;
	}

	static int f81232_set_register(struct usb_serial_port *port, u16 reg, u8 val)
	{
	int status;
	u8 *tmp;
	struct usb_device *dev = port->serial->dev;

	tmp = kmalloc(sizeof(val), GFP_KERNEL);
	if (!tmp)
	return -ENOMEM;

	*tmp = val;

	status = usb_control_msg(dev,
	usb_sndctrlpipe(dev, 0),
	F81232_REGISTER_REQUEST,
	F81232_SET_REGISTER,
	reg,
	0,
	tmp,
	sizeof(val),
	USB_CTRL_SET_TIMEOUT);
	if (status != sizeof(val)) {
	dev_err(&port->dev, "%s failed status: %d\n", __func__, status);

	if (status < 0)
	status = usb_translate_errors(status);
	else
	status = -EIO;
	} else {
	status = 0;
	}

	kfree(tmp);
	return status;
	}

	static void f81232_read_msr(struct usb_serial_port *port)
	{
	int status;
	u8 current_msr;
	struct tty_struct *tty;
	struct f81232_private *priv = usb_get_serial_port_data(port);

	mutex_lock(&priv->lock);
	status = f81232_get_register(port, MODEM_STATUS_REGISTER,
	&current_msr);
	if (status) {
	dev_err(&port->dev, "%s fail, status: %d\n", __func__, status);
	mutex_unlock(&priv->lock);
	return;
	}

	if (!(current_msr & UART_MSR_ANY_DELTA)) {
	mutex_unlock(&priv->lock);
	return;
	}

	priv->modem_status = current_msr;

	if (current_msr & UART_MSR_DCTS)
	port->icount.cts++;
	if (current_msr & UART_MSR_DDSR)
	port->icount.dsr++;
	if (current_msr & UART_MSR_TERI)
	port->icount.rng++;
	if (current_msr & UART_MSR_DDCD) {
	port->icount.dcd++;
	tty = tty_port_tty_get(&port->port);
	if (tty) {
	usb_serial_handle_dcd_change(port, tty,
	current_msr & UART_MSR_DCD);

	tty_kref_put(tty);
	}
	}

	wake_up_interruptible(&port->port.delta_msr_wait);
	mutex_unlock(&priv->lock);
	}

	static int f81232_set_mctrl(struct usb_serial_port *port,
	unsigned int set, unsigned int clear)
	{
	u8 val;
	int status;
	struct f81232_private *priv = usb_get_serial_port_data(port);

	if (((set \| clear) & (TIOCM_DTR \| TIOCM_RTS)) == 0)
	return 0; /* no change */

	/* 'set' takes precedence over 'clear' */
	clear &= ~set;

	/* force enable interrupt with OUT2 */
	mutex_lock(&priv->lock);
	val = UART_MCR_OUT2 \| priv->modem_control;

	if (clear & TIOCM_DTR)
	val &= ~UART_MCR_DTR;

	if (clear & TIOCM_RTS)
	val &= ~UART_MCR_RTS;

	if (set & TIOCM_DTR)
	val \|= UART_MCR_DTR;

	if (set & TIOCM_RTS)
	val \|= UART_MCR_RTS;

	dev_dbg(&port->dev, "%s new:%02x old:%02x\n", __func__,
	val, priv->modem_control);

	status = f81232_set_register(port, MODEM_CONTROL_REGISTER, val);
	if (status) {
	dev_err(&port->dev, "%s set MCR status < 0\n", __func__);
	mutex_unlock(&priv->lock);
	return status;
	}

	priv->modem_control = val;
	mutex_unlock(&priv->lock);

	return 0;
	}

	static void f81232_update_line_status(struct usb_serial_port *port,
	unsigned char *data,
	size_t actual_length)
	{
	struct f81232_private *priv = usb_get_serial_port_data(port);

	if (!actual_length)
	return;

	switch (data[0] & 0x07) {
	case 0x00: /* msr change */
	dev_dbg(&port->dev, "IIR: MSR Change: %02x\n", data[0]);
	schedule_work(&priv->interrupt_work);
	break;
	case 0x02: /* tx-empty */
	break;
	case 0x04: /* rx data available */
	break;
	case 0x06: /* lsr change */
	/* we can forget it. the LSR will read from bulk-in */
	dev_dbg(&port->dev, "IIR: LSR Change: %02x\n", data[0]);
	break;
	}
	}

	static void f81232_read_int_callback(struct urb *urb)
	{
	struct usb_serial_port *port = urb->context;
	unsigned char *data = urb->transfer_buffer;
	unsigned int actual_length = urb->actual_length;
	int status = urb->status;
	int retval;

	switch (status) {
	case 0:
	/* success */
	break;
	case -ECONNRESET:
	case -ENOENT:
	case -ESHUTDOWN:
	/* this urb is terminated, clean up */
	dev_dbg(&port->dev, "%s - urb shutting down with status: %d\n",
	__func__, status);
	return;
	default:
	dev_dbg(&port->dev, "%s - nonzero urb status received: %d\n",
	__func__, status);
	goto exit;
	}

	usb_serial_debug_data(&port->dev, __func__,
	urb->actual_length, urb->transfer_buffer);

	f81232_update_line_status(port, data, actual_length);

	exit:
	retval = usb_submit_urb(urb, GFP_ATOMIC);
	if (retval)
	dev_err(&urb->dev->dev,
	"%s - usb_submit_urb failed with result %d\n",
	__func__, retval);
	}

	static void f81232_process_read_urb(struct urb *urb)
	{
	struct usb_serial_port *port = urb->context;
	unsigned char *data = urb->transfer_buffer;
	char tty_flag;
	unsigned int i;
	u8 lsr;

	/*
	* When opening the port we get a 1-byte packet with the current LSR,
	* which we discard.
	*/
	if ((urb->actual_length < 2) \|\| (urb->actual_length % 2))
	return;

	/* bulk-in data: [LSR(1Byte)+DATA(1Byte)][LSR(1Byte)+DATA(1Byte)]... */

	for (i = 0; i < urb->actual_length; i += 2) {
	tty_flag = TTY_NORMAL;
	lsr = data[i];

	if (lsr & UART_LSR_BRK_ERROR_BITS) {
	if (lsr & UART_LSR_BI) {
	tty_flag = TTY_BREAK;
	port->icount.brk++;
	usb_serial_handle_break(port);
	} else if (lsr & UART_LSR_PE) {
	tty_flag = TTY_PARITY;
	port->icount.parity++;
	} else if (lsr & UART_LSR_FE) {
	tty_flag = TTY_FRAME;
	port->icount.frame++;
	}

	if (lsr & UART_LSR_OE) {
	port->icount.overrun++;
	tty_insert_flip_char(&port->port, 0,
	TTY_OVERRUN);
	}
	}

	if (port->port.console && port->sysrq) {
	if (usb_serial_handle_sysrq_char(port, data[i + 1]))
	continue;
	}

	tty_insert_flip_char(&port->port, data[i + 1], tty_flag);
	}

	tty_flip_buffer_push(&port->port);
	}

	static void f81232_break_ctl(struct tty_struct *tty, int break_state)
	{
	/* FIXME - Stubbed out for now */

	/*
	* break_state = -1 to turn on break, and 0 to turn off break
	* see drivers/char/tty_io.c to see it used.
	* last_set_data_urb_value NEVER has the break bit set in it.
	*/
	}

	static void f81232_set_baudrate(struct usb_serial_port *port, speed_t baudrate)
	{
	u8 lcr;
	int divisor, status = 0;

	divisor = calc_baud_divisor(baudrate);

	status = f81232_get_register(port, LINE_CONTROL_REGISTER,
	&lcr); /* get LCR */
	if (status) {
	dev_err(&port->dev, "%s failed to get LCR: %d\n",
	__func__, status);
	return;
	}

	status = f81232_set_register(port, LINE_CONTROL_REGISTER,
	lcr \| UART_LCR_DLAB); /* Enable DLAB */
	if (status) {
	dev_err(&port->dev, "%s failed to set DLAB: %d\n",
	__func__, status);
	return;
	}

	status = f81232_set_register(port, RECEIVE_BUFFER_REGISTER,
	divisor & 0x00ff); /* low */
	if (status) {
	dev_err(&port->dev, "%s failed to set baudrate MSB: %d\n",
	__func__, status);
	goto reapply_lcr;
	}

	status = f81232_set_register(port, INTERRUPT_ENABLE_REGISTER,
	(divisor & 0xff00) >> 8); /* high */
	if (status) {
	dev_err(&port->dev, "%s failed to set baudrate LSB: %d\n",
	__func__, status);
	}

	reapply_lcr:
	status = f81232_set_register(port, LINE_CONTROL_REGISTER,
	lcr & ~UART_LCR_DLAB);
	if (status) {
	dev_err(&port->dev, "%s failed to set DLAB: %d\n",
	__func__, status);
	}
	}

	static int f81232_port_enable(struct usb_serial_port *port)
	{
	u8 val;
	int status;

	/* fifo on, trigger8, clear TX/RX*/
	val = UART_FCR_TRIGGER_8 \| UART_FCR_ENABLE_FIFO \| UART_FCR_CLEAR_RCVR \|
	UART_FCR_CLEAR_XMIT;

	status = f81232_set_register(port, FIFO_CONTROL_REGISTER, val);
	if (status) {
	dev_err(&port->dev, "%s failed to set FCR: %d\n",
	__func__, status);
	return status;
	}

	/* MSR Interrupt only, LSR will read from Bulk-in odd byte */
	status = f81232_set_register(port, INTERRUPT_ENABLE_REGISTER,
	UART_IER_MSI);
	if (status) {
	dev_err(&port->dev, "%s failed to set IER: %d\n",
	__func__, status);
	return status;
	}

	return 0;
	}

	static int f81232_port_disable(struct usb_serial_port *port)
	{
	int status;

	status = f81232_set_register(port, INTERRUPT_ENABLE_REGISTER, 0);
	if (status) {
	dev_err(&port->dev, "%s failed to set IER: %d\n",
	__func__, status);
	return status;
	}

	return 0;
	}

	static void f81232_set_termios(struct tty_struct *tty,
	struct usb_serial_port port, struct ktermios old_termios)
	{
	u8 new_lcr = 0;
	int status = 0;
	speed_t baudrate;

	/* Don't change anything if nothing has changed */
	if (old_termios && !tty_termios_hw_change(&tty->termios, old_termios))
	return;

	if (C_BAUD(tty) == B0)
	f81232_set_mctrl(port, 0, TIOCM_DTR \| TIOCM_RTS);
	else if (old_termios && (old_termios->c_cflag & CBAUD) == B0)
	f81232_set_mctrl(port, TIOCM_DTR \| TIOCM_RTS, 0);

	baudrate = tty_get_baud_rate(tty);
	if (baudrate > 0) {
	if (baudrate > F81232_MAX_BAUDRATE) {
	baudrate = F81232_MAX_BAUDRATE;
	tty_encode_baud_rate(tty, baudrate, baudrate);
	}
	f81232_set_baudrate(port, baudrate);
	}

	if (C_PARENB(tty)) {
	new_lcr \|= UART_LCR_PARITY;

	if (!C_PARODD(tty))
	new_lcr \|= UART_LCR_EPAR;

	if (C_CMSPAR(tty))
	new_lcr \|= UART_LCR_SPAR;
	}

	if (C_CSTOPB(tty))
	new_lcr \|= UART_LCR_STOP;

	switch (C_CSIZE(tty)) {
	case CS5:
	new_lcr \|= UART_LCR_WLEN5;
	break;
	case CS6:
	new_lcr \|= UART_LCR_WLEN6;
	break;
	case CS7:
	new_lcr \|= UART_LCR_WLEN7;
	break;
	default:
	case CS8:
	new_lcr \|= UART_LCR_WLEN8;
	break;
	}

	status = f81232_set_register(port, LINE_CONTROL_REGISTER, new_lcr);
	if (status) {
	dev_err(&port->dev, "%s failed to set LCR: %d\n",
	__func__, status);
	}
	}

	static int f81232_tiocmget(struct tty_struct *tty)
	{
	int r;
	struct usb_serial_port *port = tty->driver_data;
	struct f81232_private *port_priv = usb_get_serial_port_data(port);
	u8 mcr, msr;

	/* force get current MSR changed state */
	f81232_read_msr(port);

	mutex_lock(&port_priv->lock);
	mcr = port_priv->modem_control;
	msr = port_priv->modem_status;
	mutex_unlock(&port_priv->lock);

	r = (mcr & UART_MCR_DTR ? TIOCM_DTR : 0) \|
	(mcr & UART_MCR_RTS ? TIOCM_RTS : 0) \|
	(msr & UART_MSR_CTS ? TIOCM_CTS : 0) \|
	(msr & UART_MSR_DCD ? TIOCM_CAR : 0) \|
	(msr & UART_MSR_RI ? TIOCM_RI : 0) \|
	(msr & UART_MSR_DSR ? TIOCM_DSR : 0);

	return r;
	}

	static int f81232_tiocmset(struct tty_struct *tty,
	unsigned int set, unsigned int clear)
	{
	struct usb_serial_port *port = tty->driver_data;

	return f81232_set_mctrl(port, set, clear);
	}

	static int f81232_open(struct tty_struct tty, struct usb_serial_port port)
	{
	int result;

	result = f81232_port_enable(port);
	if (result)
	return result;

	/* Setup termios */
	if (tty)
	f81232_set_termios(tty, port, NULL);

	result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
	if (result) {
	dev_err(&port->dev, "%s - failed submitting interrupt urb,"
	" error %d\n", __func__, result);
	return result;
	}

	result = usb_serial_generic_open(tty, port);
	if (result) {
	usb_kill_urb(port->interrupt_in_urb);
	return result;
	}

	return 0;
	}

	static void f81232_close(struct usb_serial_port *port)
	{
	f81232_port_disable(port);
	usb_serial_generic_close(port);
	usb_kill_urb(port->interrupt_in_urb);
	}

	static void f81232_dtr_rts(struct usb_serial_port *port, int on)
	{
	if (on)
	f81232_set_mctrl(port, TIOCM_DTR \| TIOCM_RTS, 0);
	else
	f81232_set_mctrl(port, 0, TIOCM_DTR \| TIOCM_RTS);
	}

	static int f81232_carrier_raised(struct usb_serial_port *port)
	{
	u8 msr;
	struct f81232_private *priv = usb_get_serial_port_data(port);

	mutex_lock(&priv->lock);
	msr = priv->modem_status;
	mutex_unlock(&priv->lock);

	if (msr & UART_MSR_DCD)
	return 1;
	return 0;
	}

	static int f81232_get_serial_info(struct usb_serial_port *port,
	unsigned long arg)
	{
	struct serial_struct ser;

	memset(&ser, 0, sizeof(ser));

	ser.type = PORT_16550A;
	ser.line = port->minor;
	ser.port = port->port_number;
	ser.baud_base = F81232_MAX_BAUDRATE;

	if (copy_to_user((void __user *)arg, &ser, sizeof(ser)))
	return -EFAULT;

	return 0;
	}

	static int f81232_ioctl(struct tty_struct *tty,
	unsigned int cmd, unsigned long arg)
	{
	struct usb_serial_port *port = tty->driver_data;

	switch (cmd) {
	case TIOCGSERIAL:
	return f81232_get_serial_info(port, arg);
	default:
	break;
	}
	return -ENOIOCTLCMD;
	}

	static void f81232_interrupt_work(struct work_struct *work)
	{
	struct f81232_private *priv =
	container_of(work, struct f81232_private, interrupt_work);

	f81232_read_msr(priv->port);
	}

	static int f81232_port_probe(struct usb_serial_port *port)
	{
	struct f81232_private *priv;

	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
	if (!priv)
	return -ENOMEM;

	mutex_init(&priv->lock);
	INIT_WORK(&priv->interrupt_work, f81232_interrupt_work);

	usb_set_serial_port_data(port, priv);

	port->port.drain_delay = 256;
	priv->port = port;

	return 0;
	}

	static int f81232_port_remove(struct usb_serial_port *port)
	{
	struct f81232_private *priv;

	priv = usb_get_serial_port_data(port);
	kfree(priv);

	return 0;
	}

	static struct usb_serial_driver f81232_device = {
	.driver = {
	.owner = THIS_MODULE,
	.name = "f81232",
	},
	.id_table = id_table,
	.num_ports = 1,
	.bulk_in_size = 256,
	.bulk_out_size = 256,
	.open = f81232_open,
	.close = f81232_close,
	.dtr_rts = f81232_dtr_rts,
	.carrier_raised = f81232_carrier_raised,
	.ioctl = f81232_ioctl,
	.break_ctl = f81232_break_ctl,
	.set_termios = f81232_set_termios,
	.tiocmget = f81232_tiocmget,
	.tiocmset = f81232_tiocmset,
	.tiocmiwait = usb_serial_generic_tiocmiwait,
	.process_read_urb = f81232_process_read_urb,
	.read_int_callback = f81232_read_int_callback,
	.port_probe = f81232_port_probe,
	.port_remove = f81232_port_remove,
	};

	static struct usb_serial_driver * const serial_drivers[] = {
	&f81232_device,
	NULL,
	};

	module_usb_serial_driver(serial_drivers, id_table);

	MODULE_DESCRIPTION("Fintek F81232 USB to serial adaptor driver");
	MODULE_AUTHOR("Greg Kroah-Hartman <gregkh@linuxfoundation.org>");
	MODULE_AUTHOR("Peter Hong <peter_hong@fintek.com.tw>");
	MODULE_LICENSE("GPL v2");