text: // SPDX-License-Identifier: GPL-2.0+
  /*
   * Infinity Unlimited USB Phoenix driver
   *
   * Copyright (C) 2010 James Courtier-Dutton (James@superbug.co.uk)
  
   * Copyright (C) 2007 Alain Degreffe (eczema@ecze.com)
   *
   * Original code taken from iuutool (Copyright (C) 2006 Juan Carlos BorrÃ¡s)
   *
   *  And tested with help of WB Electronics
   */
  #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/uaccess.h>
  #include <linux/usb.h>
  #include <linux/usb/serial.h>
  #include "iuu_phoenix.h"
  #include <linux/random.h>
  
  #define DRIVER_DESC "Infinity USB Unlimited Phoenix driver"
  
  static const struct usb_device_id id_table[] = {
  	{USB_DEVICE(IUU_USB_VENDOR_ID, IUU_USB_PRODUCT_ID)},
  	{}			/* Terminating entry */
  };
  MODULE_DEVICE_TABLE(usb, id_table);
  
  /* turbo parameter */
  static int boost = 100;
  static int clockmode = 1;
  static int cdmode = 1;
  static int iuu_cardin;
  static int iuu_cardout;
  static bool xmas;
  static int vcc_default = 5;
  
  static int iuu_create_sysfs_attrs(struct usb_serial_port *port);
  static int iuu_remove_sysfs_attrs(struct usb_serial_port *port);
  static void read_rxcmd_callback(struct urb *urb);
  
  struct iuu_private {
  	spinlock_t lock;	/* store irq state */
  	u8 line_status;
  	int tiostatus;		/* store IUART SIGNAL for tiocmget call */
  	u8 reset;		/* if 1 reset is needed */
  	int poll;		/* number of poll */
  	u8 *writebuf;		/* buffer for writing to device */
  	int writelen;		/* num of byte to write to device */
  	u8 *buf;		/* used for initialize speed */
  	u8 len;
  	int vcc;		/* vcc (either 3 or 5 V) */
  	u32 boost;
  	u32 clk;
  };
  
  static int iuu_port_probe(struct usb_serial_port *port)
  {
  	struct iuu_private *priv;
  	int ret;
  
  	priv = kzalloc(sizeof(struct iuu_private), GFP_KERNEL);
  	if (!priv)
  		return -ENOMEM;
  
  	priv->buf = kzalloc(256, GFP_KERNEL);
  	if (!priv->buf) {
  		kfree(priv);
  		return -ENOMEM;
  	}
  
  	priv->writebuf = kzalloc(256, GFP_KERNEL);
  	if (!priv->writebuf) {
  		kfree(priv->buf);
  		kfree(priv);
  		return -ENOMEM;
  	}
  
  	priv->vcc = vcc_default;
  	spin_lock_init(&priv->lock);
  
  	usb_set_serial_port_data(port, priv);
  
  	ret = iuu_create_sysfs_attrs(port);
  	if (ret) {
  		kfree(priv->writebuf);
  		kfree(priv->buf);
  		kfree(priv);
  		return ret;
  	}
  
  	return 0;
  }
  
  static int iuu_port_remove(struct usb_serial_port *port)
  {
  	struct iuu_private *priv = usb_get_serial_port_data(port);
  
  	iuu_remove_sysfs_attrs(port);
  	kfree(priv->writebuf);
  	kfree(priv->buf);
  	kfree(priv);
  
  	return 0;
  }
  
  static int iuu_tiocmset(struct tty_struct *tty,
  			unsigned int set, unsigned int clear)
  {
  	struct usb_serial_port *port = tty->driver_data;
  	struct iuu_private *priv = usb_get_serial_port_data(port);
  	unsigned long flags;
  
  	/* FIXME: locking on tiomstatus */
  	dev_dbg(&port->dev, "%s msg : SET = 0x%04x, CLEAR = 0x%04x\n",
  		__func__, set, clear);
  
  	spin_lock_irqsave(&priv->lock, flags);
  
  	if ((set & TIOCM_RTS) && !(priv->tiostatus == TIOCM_RTS)) {
  		dev_dbg(&port->dev, "%s TIOCMSET RESET called !!!\n", __func__);
  		priv->reset = 1;
  	}
  	if (set & TIOCM_RTS)
  		priv->tiostatus = TIOCM_RTS;
  
  	spin_unlock_irqrestore(&priv->lock, flags);
  	return 0;
  }
  
  /* This is used to provide a carrier detect mechanism
   * When a card is present, the response is 0x00
   * When no card , the reader respond with TIOCM_CD
   * This is known as CD autodetect mechanism
   */
  static int iuu_tiocmget(struct tty_struct *tty)
  {
  	struct usb_serial_port *port = tty->driver_data;
  	struct iuu_private *priv = usb_get_serial_port_data(port);
  	unsigned long flags;
  	int rc;
  
  	spin_lock_irqsave(&priv->lock, flags);
  	rc = priv->tiostatus;
  	spin_unlock_irqrestore(&priv->lock, flags);
  
  	return rc;
  }
  
  static void iuu_rxcmd(struct urb *urb)
  {
  	struct usb_serial_port *port = urb->context;
  	int result;
  	int status = urb->status;
  
  	if (status) {
  		dev_dbg(&port->dev, "%s - status = %d\n", __func__, status);
  		/* error stop all */
  		return;
  	}
  
  
  	memset(port->write_urb->transfer_buffer, IUU_UART_RX, 1);
  	usb_fill_bulk_urb(port->write_urb, port->serial->dev,
  			  usb_sndbulkpipe(port->serial->dev,
  					  port->bulk_out_endpointAddress),
  			  port->write_urb->transfer_buffer, 1,
  			  read_rxcmd_callback, port);
  	result = usb_submit_urb(port->write_urb, GFP_ATOMIC);
  }
  
  static int iuu_reset(struct usb_serial_port *port, u8 wt)
  {
  	struct iuu_private *priv = usb_get_serial_port_data(port);
  	int result;
  	char *buf_ptr = port->write_urb->transfer_buffer;
  
  	/* Prepare the reset sequence */
  
  	*buf_ptr++ = IUU_RST_SET;
  	*buf_ptr++ = IUU_DELAY_MS;
  	*buf_ptr++ = wt;
  	*buf_ptr = IUU_RST_CLEAR;
  
  	/* send the sequence */
  
  	usb_fill_bulk_urb(port->write_urb,
  			  port->serial->dev,
  			  usb_sndbulkpipe(port->serial->dev,
  					  port->bulk_out_endpointAddress),
  			  port->write_urb->transfer_buffer, 4, iuu_rxcmd, port);
  	result = usb_submit_urb(port->write_urb, GFP_ATOMIC);
  	priv->reset = 0;
  	return result;
  }
  
  /* Status Function
   * Return value is
   * 0x00 = no card
   * 0x01 = smartcard
   * 0x02 = sim card
   */
  static void iuu_update_status_callback(struct urb *urb)
  {
  	struct usb_serial_port *port = urb->context;
  	struct iuu_private *priv = usb_get_serial_port_data(port);
  	u8 *st;
  	int status = urb->status;
  
  	if (status) {
  		dev_dbg(&port->dev, "%s - status = %d\n", __func__, status);
  		/* error stop all */
  		return;
  	}
  
  	st = urb->transfer_buffer;
  	dev_dbg(&port->dev, "%s - enter\n", __func__);
  	if (urb->actual_length == 1) {
  		switch (st[0]) {
  		case 0x1:
  			priv->tiostatus = iuu_cardout;
  			break;
  		case 0x0:
  			priv->tiostatus = iuu_cardin;
  			break;
  		default:
  			priv->tiostatus = iuu_cardin;
  		}
  	}
  	iuu_rxcmd(urb);
  }
  
  static void iuu_status_callback(struct urb *urb)
  {
  	struct usb_serial_port *port = urb->context;
  	int result;
  	int status = urb->status;
  
  	dev_dbg(&port->dev, "%s - status = %d\n", __func__, status);
  	usb_fill_bulk_urb(port->read_urb, port->serial->dev,
  			  usb_rcvbulkpipe(port->serial->dev,
  					  port->bulk_in_endpointAddress),
  			  port->read_urb->transfer_buffer, 256,
  			  iuu_update_status_callback, port);
  	result = usb_submit_urb(port->read_urb, GFP_ATOMIC);
  }
  
  static int iuu_status(struct usb_serial_port *port)
  {
  	int result;
  
  	memset(port->write_urb->transfer_buffer, IUU_GET_STATE_REGISTER, 1);
  	usb_fill_bulk_urb(port->write_urb, port->serial->dev,
  			  usb_sndbulkpipe(port->serial->dev,
  					  port->bulk_out_endpointAddress),
  			  port->write_urb->transfer_buffer, 1,
  			  iuu_status_callback, port);
  	result = usb_submit_urb(port->write_urb, GFP_ATOMIC);
  	return result;
  
  }
  
  static int bulk_immediate(struct usb_serial_port *port, u8 *buf, u8 count)
  {
  	int status;
  	struct usb_serial *serial = port->serial;
  	int actual = 0;
  
  	/* send the data out the bulk port */
  
  	status =
  	    usb_bulk_msg(serial->dev,
  			 usb_sndbulkpipe(serial->dev,
  					 port->bulk_out_endpointAddress), buf,
  			 count, &actual, 1000);
  
  	if (status != IUU_OPERATION_OK)
  		dev_dbg(&port->dev, "%s - error = %2x\n", __func__, status);
  	else
  		dev_dbg(&port->dev, "%s - write OK !\n", __func__);
  	return status;
  }
  
  static int read_immediate(struct usb_serial_port *port, u8 *buf, u8 count)
  {
  	int status;
  	struct usb_serial *serial = port->serial;
  	int actual = 0;
  
  	/* send the data out the bulk port */
  	status =
  	    usb_bulk_msg(serial->dev,
  			 usb_rcvbulkpipe(serial->dev,
  					 port->bulk_in_endpointAddress), buf,
  			 count, &actual, 1000);
  
  	if (status != IUU_OPERATION_OK)
  		dev_dbg(&port->dev, "%s - error = %2x\n", __func__, status);
  	else
  		dev_dbg(&port->dev, "%s - read OK !\n", __func__);
  	return status;
  }
  
  static int iuu_led(struct usb_serial_port *port, unsigned int R,
  		   unsigned int G, unsigned int B, u8 f)
  {
  	int status;
  	u8 *buf;
  	buf = kmalloc(8, GFP_KERNEL);
  	if (!buf)
  		return -ENOMEM;
  
  	buf[0] = IUU_SET_LED;
  	buf[1] = R & 0xFF;
  	buf[2] = (R >> 8) & 0xFF;
  	buf[3] = G & 0xFF;
  	buf[4] = (G >> 8) & 0xFF;
  	buf[5] = B & 0xFF;
  	buf[6] = (B >> 8) & 0xFF;
  	buf[7] = f;
  	status = bulk_immediate(port, buf, 8);
  	kfree(buf);
  	if (status != IUU_OPERATION_OK)
  		dev_dbg(&port->dev, "%s - led error status = %2x\n", __func__, status);
  	else
  		dev_dbg(&port->dev, "%s - led OK !\n", __func__);
  	return IUU_OPERATION_OK;
  }
  
  static void iuu_rgbf_fill_buffer(u8 *buf, u8 r1, u8 r2, u8 g1, u8 g2, u8 b1,
  				 u8 b2, u8 freq)
  {
  	*buf++ = IUU_SET_LED;
  	*buf++ = r1;
  	*buf++ = r2;
  	*buf++ = g1;
  	*buf++ = g2;
  	*buf++ = b1;
  	*buf++ = b2;
  	*buf = freq;
  }
  
  static void iuu_led_activity_on(struct urb *urb)
  {
  	struct usb_serial_port *port = urb->context;
  	int result;
  	char *buf_ptr = port->write_urb->transfer_buffer;
  	*buf_ptr++ = IUU_SET_LED;
  	if (xmas) {
  		get_random_bytes(buf_ptr, 6);
  		*(buf_ptr+7) = 1;
  	} else {
  		iuu_rgbf_fill_buffer(buf_ptr, 255, 255, 0, 0, 0, 0, 255);
  	}
  
  	usb_fill_bulk_urb(port->write_urb, port->serial->dev,
  			  usb_sndbulkpipe(port->serial->dev,
  					  port->bulk_out_endpointAddress),
  			  port->write_urb->transfer_buffer, 8 ,
  			  iuu_rxcmd, port);
  	result = usb_submit_urb(port->write_urb, GFP_ATOMIC);
  }
  
  static void iuu_led_activity_off(struct urb *urb)
  {
  	struct usb_serial_port *port = urb->context;
  	int result;
  	char *buf_ptr = port->write_urb->transfer_buffer;
  	if (xmas) {
  		iuu_rxcmd(urb);
  		return;
  	} else {
  		*buf_ptr++ = IUU_SET_LED;
  		iuu_rgbf_fill_buffer(buf_ptr, 0, 0, 255, 255, 0, 0, 255);
  	}
  	usb_fill_bulk_urb(port->write_urb, port->serial->dev,
  			  usb_sndbulkpipe(port->serial->dev,
  					  port->bulk_out_endpointAddress),
  			  port->write_urb->transfer_buffer, 8 ,
  			  iuu_rxcmd, port);
  	result = usb_submit_urb(port->write_urb, GFP_ATOMIC);
  }
  
  
  
  static int iuu_clk(struct usb_serial_port *port, int dwFrq)
  {
  	int status;
  	struct iuu_private *priv = usb_get_serial_port_data(port);
  	int Count = 0;
  	u8 FrqGenAdr = 0x69;
  	u8 DIV = 0;		/* 8bit */
  	u8 XDRV = 0;		/* 8bit */
  	u8 PUMP = 0;		/* 3bit */
  	u8 PBmsb = 0;		/* 2bit */
  	u8 PBlsb = 0;		/* 8bit */
  	u8 PO = 0;		/* 1bit */
  	u8 Q = 0;		/* 7bit */
  	/* 24bit = 3bytes */
  	unsigned int P = 0;
  	unsigned int P2 = 0;
  	int frq = (int)dwFrq;
  
  	if (frq == 0) {
  		priv->buf[Count++] = IUU_UART_WRITE_I2C;
  		priv->buf[Count++] = FrqGenAdr << 1;
  		priv->buf[Count++] = 0x09;
  		priv->buf[Count++] = 0x00;
  
  		status = bulk_immediate(port, (u8 *) priv->buf, Count);
  		if (status != 0) {
  			dev_dbg(&port->dev, "%s - write error\n", __func__);
  			return status;
  		}
  	} else if (frq == 3579000) {
  		DIV = 100;
  		P = 1193;
  		Q = 40;
  		XDRV = 0;
  	} else if (frq == 3680000) {
  		DIV = 105;
  		P = 161;
  		Q = 5;
  		XDRV = 0;
  	} else if (frq == 6000000) {
  		DIV = 66;
  		P = 66;
  		Q = 2;
  		XDRV = 0x28;
  	} else {
  		unsigned int result = 0;
  		unsigned int tmp = 0;
  		unsigned int check;
  		unsigned int check2;
  		char found = 0x00;
  		unsigned int lQ = 2;
  		unsigned int lP = 2055;
  		unsigned int lDiv = 4;
  
  		for (lQ = 2; lQ <= 47 && !found; lQ++)
  			for (lP = 2055; lP >= 8 && !found; lP--)
  				for (lDiv = 4; lDiv <= 127 && !found; lDiv++) {
  					tmp = (12000000 / lDiv) * (lP / lQ);
  					if (abs((int)(tmp - frq)) <
  					    abs((int)(frq - result))) {
  						check2 = (12000000 / lQ);
  						if (check2 < 250000)
  							continue;
  						check = (12000000 / lQ) * lP;
  						if (check > 400000000)
  							continue;
  						if (check < 100000000)
  							continue;
  						if (lDiv < 4 || lDiv > 127)
  							continue;
  						result = tmp;
  						P = lP;
  						DIV = lDiv;
  						Q = lQ;
  						if (result == frq)
  							found = 0x01;
  					}
  				}
  	}
  	P2 = ((P - PO) / 2) - 4;
  	PUMP = 0x04;
  	PBmsb = (P2 >> 8 & 0x03);
  	PBlsb = P2 & 0xFF;
  	PO = (P >> 10) & 0x01;
  	Q = Q - 2;
  
  	priv->buf[Count++] = IUU_UART_WRITE_I2C;	/* 0x4C */
  	priv->buf[Count++] = FrqGenAdr << 1;
  	priv->buf[Count++] = 0x09;
  	priv->buf[Count++] = 0x20;	/* Adr = 0x09 */
  	priv->buf[Count++] = IUU_UART_WRITE_I2C;	/* 0x4C */
  	priv->buf[Count++] = FrqGenAdr << 1;
  	priv->buf[Count++] = 0x0C;
  	priv->buf[Count++] = DIV;	/* Adr = 0x0C */
  	priv->buf[Count++] = IUU_UART_WRITE_I2C;	/* 0x4C */
  	priv->buf[Count++] = FrqGenAdr << 1;
  	priv->buf[Count++] = 0x12;
  	priv->buf[Count++] = XDRV;	/* Adr = 0x12 */
  	priv->buf[Count++] = IUU_UART_WRITE_I2C;	/*  0x4C */
  	priv->buf[Count++] = FrqGenAdr << 1;
  	priv->buf[Count++] = 0x13;
  	priv->buf[Count++] = 0x6B;	/* Adr = 0x13 */
  	priv->buf[Count++] = IUU_UART_WRITE_I2C;	/*  0x4C */
  	priv->buf[Count++] = FrqGenAdr << 1;
  	priv->buf[Count++] = 0x40;
  	priv->buf[Count++] = (0xC0 | ((PUMP & 0x07) << 2)) |
  			     (PBmsb & 0x03);	/* Adr = 0x40 */
  	priv->buf[Count++] = IUU_UART_WRITE_I2C;	/*  0x4C */
  	priv->buf[Count++] = FrqGenAdr << 1;
  	priv->buf[Count++] = 0x41;
  	priv->buf[Count++] = PBlsb;	/* Adr = 0x41 */
  	priv->buf[Count++] = IUU_UART_WRITE_I2C;	/*  0x4C */
  	priv->buf[Count++] = FrqGenAdr << 1;
  	priv->buf[Count++] = 0x42;
  	priv->buf[Count++] = Q | (((PO & 0x01) << 7));	/* Adr = 0x42 */
  	priv->buf[Count++] = IUU_UART_WRITE_I2C;	/*  0x4C */
  	priv->buf[Count++] = FrqGenAdr << 1;
  	priv->buf[Count++] = 0x44;
  	priv->buf[Count++] = (char)0xFF;	/* Adr = 0x44 */
  	priv->buf[Count++] = IUU_UART_WRITE_I2C;	/*  0x4C */
  	priv->buf[Count++] = FrqGenAdr << 1;
  	priv->buf[Count++] = 0x45;
  	priv->buf[Count++] = (char)0xFE;	/* Adr = 0x45 */
  	priv->buf[Count++] = IUU_UART_WRITE_I2C;	/*  0x4C */
  	priv->buf[Count++] = FrqGenAdr << 1;
  	priv->buf[Count++] = 0x46;
  	priv->buf[Count++] = 0x7F;	/* Adr = 0x46 */
  	priv->buf[Count++] = IUU_UART_WRITE_I2C;	/*  0x4C */
  	priv->buf[Count++] = FrqGenAdr << 1;
  	priv->buf[Count++] = 0x47;
  	priv->buf[Count++] = (char)0x84;	/* Adr = 0x47 */
  
  	status = bulk_immediate(port, (u8 *) priv->buf, Count);
  	if (status != IUU_OPERATION_OK)
  		dev_dbg(&port->dev, "%s - write error\n", __func__);
  	return status;
  }
  
  static int iuu_uart_flush(struct usb_serial_port *port)
  {
  	struct device *dev = &port->dev;
  	int i;
  	int status;
  	u8 rxcmd = IUU_UART_RX;
  	struct iuu_private *priv = usb_get_serial_port_data(port);
  
  	if (iuu_led(port, 0xF000, 0, 0, 0xFF) < 0)
  		return -EIO;
  
  	for (i = 0; i < 2; i++) {
  		status = bulk_immediate(port, &rxcmd, 1);
  		if (status != IUU_OPERATION_OK) {
  			dev_dbg(dev, "%s - uart_flush_write error\n", __func__);
  			return status;
  		}
  
  		status = read_immediate(port, &priv->len, 1);
  		if (status != IUU_OPERATION_OK) {
  			dev_dbg(dev, "%s - uart_flush_read error\n", __func__);
  			return status;
  		}
  
  		if (priv->len > 0) {
  			dev_dbg(dev, "%s - uart_flush datalen is : %i\n", __func__, priv->len);
  			status = read_immediate(port, priv->buf, priv->len);
  			if (status != IUU_OPERATION_OK) {
  				dev_dbg(dev, "%s - uart_flush_read error\n", __func__);
  				return status;
  			}
  		}
  	}
  	dev_dbg(dev, "%s - uart_flush_read OK!\n", __func__);
  	iuu_led(port, 0, 0xF000, 0, 0xFF);
  	return status;
  }
  
  static void read_buf_callback(struct urb *urb)
  {
  	struct usb_serial_port *port = urb->context;
  	unsigned char *data = urb->transfer_buffer;
  	int status = urb->status;
  
  	if (status) {
  		if (status == -EPROTO) {
  			/* reschedule needed */
  		}
  		return;
  	}
  
  	dev_dbg(&port->dev, "%s - %i chars to write\n", __func__, urb->actual_length);
  
  	if (urb->actual_length) {
  		tty_insert_flip_string(&port->port, data, urb->actual_length);
  		tty_flip_buffer_push(&port->port);
  	}
  	iuu_led_activity_on(urb);
  }
  
  static int iuu_bulk_write(struct usb_serial_port *port)
  {
  	struct iuu_private *priv = usb_get_serial_port_data(port);
  	unsigned long flags;
  	int result;
  	int buf_len;
  	char *buf_ptr = port->write_urb->transfer_buffer;
  
  	spin_lock_irqsave(&priv->lock, flags);
  	*buf_ptr++ = IUU_UART_ESC;
  	*buf_ptr++ = IUU_UART_TX;
  	*buf_ptr++ = priv->writelen;
  
  	memcpy(buf_ptr, priv->writebuf, priv->writelen);
  	buf_len = priv->writelen;
  	priv->writelen = 0;
  	spin_unlock_irqrestore(&priv->lock, flags);
  	dev_dbg(&port->dev, "%s - writing %i chars : %*ph\n", __func__,
  		buf_len, buf_len, buf_ptr);
  	usb_fill_bulk_urb(port->write_urb, port->serial->dev,
  			  usb_sndbulkpipe(port->serial->dev,
  					  port->bulk_out_endpointAddress),
  			  port->write_urb->transfer_buffer, buf_len + 3,
  			  iuu_rxcmd, port);
  	result = usb_submit_urb(port->write_urb, GFP_ATOMIC);
  	usb_serial_port_softint(port);
  	return result;
  }
  
  static int iuu_read_buf(struct usb_serial_port *port, int len)
  {
  	int result;
  
  	usb_fill_bulk_urb(port->read_urb, port->serial->dev,
  			  usb_rcvbulkpipe(port->serial->dev,
  					  port->bulk_in_endpointAddress),
  			  port->read_urb->transfer_buffer, len,
  			  read_buf_callback, port);
  	result = usb_submit_urb(port->read_urb, GFP_ATOMIC);
  	return result;
  }
  
  static void iuu_uart_read_callback(struct urb *urb)
  {
  	struct usb_serial_port *port = urb->context;
  	struct iuu_private *priv = usb_get_serial_port_data(port);
  	unsigned long flags;
  	int status = urb->status;
  	int error = 0;
  	int len = 0;
  	unsigned char *data = urb->transfer_buffer;
  	priv->poll++;
  
  	if (status) {
  		dev_dbg(&port->dev, "%s - status = %d\n", __func__, status);
  		/* error stop all */
  		return;
  	}
  
  	if (urb->actual_length == 1)
  		len = (int) data[0];
  
  	if (urb->actual_length > 1) {
  		dev_dbg(&port->dev, "%s - urb->actual_length = %i\n", __func__,
  		    urb->actual_length);
  		error = 1;
  		return;
  	}
  	/* if len > 0 call readbuf */
  
  	if (len > 0 && error == 0) {
  		dev_dbg(&port->dev, "%s - call read buf - len to read is %i\n",
  			__func__, len);
  		status = iuu_read_buf(port, len);
  		return;
  	}
  	/* need to update status  ? */
  	if (priv->poll > 99) {
  		status = iuu_status(port);
  		priv->poll = 0;
  		return;
  	}
  
  	/* reset waiting ? */
  
  	if (priv->reset == 1) {
  		status = iuu_reset(port, 0xC);
  		return;
  	}
  	/* Writebuf is waiting */
  	spin_lock_irqsave(&priv->lock, flags);
  	if (priv->writelen > 0) {
  		spin_unlock_irqrestore(&priv->lock, flags);
  		status = iuu_bulk_write(port);
  		return;
  	}
  	spin_unlock_irqrestore(&priv->lock, flags);
  	/* if nothing to write call again rxcmd */
  	dev_dbg(&port->dev, "%s - rxcmd recall\n", __func__);
  	iuu_led_activity_off(urb);
  }
  
  static int iuu_uart_write(struct tty_struct *tty, struct usb_serial_port *port,
  			  const u8 *buf, int count)
  {
  	struct iuu_private *priv = usb_get_serial_port_data(port);
  	unsigned long flags;
  
  	if (count > 256)
  		return -ENOMEM;
  
  	spin_lock_irqsave(&priv->lock, flags);
  
  	/* fill the buffer */
  	memcpy(priv->writebuf + priv->writelen, buf, count);
  	priv->writelen += count;
  	spin_unlock_irqrestore(&priv->lock, flags);
  
  	return count;
  }
  
  static void read_rxcmd_callback(struct urb *urb)
  {
  	struct usb_serial_port *port = urb->context;
  	int result;
  	int status = urb->status;
  
  	if (status) {
  		/* error stop all */
  		return;
  	}
  
  	usb_fill_bulk_urb(port->read_urb, port->serial->dev,
  			  usb_rcvbulkpipe(port->serial->dev,
  					  port->bulk_in_endpointAddress),
  			  port->read_urb->transfer_buffer, 256,
  			  iuu_uart_read_callback, port);
  	result = usb_submit_urb(port->read_urb, GFP_ATOMIC);
  	dev_dbg(&port->dev, "%s - submit result = %d\n", __func__, result);
  }
  
  static int iuu_uart_on(struct usb_serial_port *port)
  {
  	int status;
  	u8 *buf;
  
  	buf = kmalloc(4, GFP_KERNEL);
  
  	if (!buf)
  		return -ENOMEM;
  
  	buf[0] = IUU_UART_ENABLE;
  	buf[1] = (u8) ((IUU_BAUD_9600 >> 8) & 0x00FF);
  	buf[2] = (u8) (0x00FF & IUU_BAUD_9600);
  	buf[3] = (u8) (0x0F0 & IUU_ONE_STOP_BIT) | (0x07 & IUU_PARITY_EVEN);
  
  	status = bulk_immediate(port, buf, 4);
  	if (status != IUU_OPERATION_OK) {
  		dev_dbg(&port->dev, "%s - uart_on error\n", __func__);
  		goto uart_enable_failed;
  	}
  	/*  iuu_reset() the card after iuu_uart_on() */
  	status = iuu_uart_flush(port);
  	if (status != IUU_OPERATION_OK)
  		dev_dbg(&port->dev, "%s - uart_flush error\n", __func__);
  uart_enable_failed:
  	kfree(buf);
  	return status;
  }
  
  /*  Disables the IUU UART (a.k.a. the Phoenix voiderface) */
  static int iuu_uart_off(struct usb_serial_port *port)
  {
  	int status;
  	u8 *buf;
  	buf = kmalloc(1, GFP_KERNEL);
  	if (!buf)
  		return -ENOMEM;
  	buf[0] = IUU_UART_DISABLE;
  
  	status = bulk_immediate(port, buf, 1);
  	if (status != IUU_OPERATION_OK)
  		dev_dbg(&port->dev, "%s - uart_off error\n", __func__);
  
  	kfree(buf);
  	return status;
  }
  
  static int iuu_uart_baud(struct usb_serial_port *port, u32 baud_base,
  			 u32 *actual, u8 parity)
  {
  	int status;
  	u32 baud;
  	u8 *dataout;
  	u8 DataCount = 0;
  	u8 T1Frekvens = 0;
  	u8 T1reload = 0;
  	unsigned int T1FrekvensHZ = 0;
  
  	dev_dbg(&port->dev, "%s - enter baud_base=%d\n", __func__, baud_base);
  	dataout = kmalloc(5, GFP_KERNEL);
  
  	if (!dataout)
  		return -ENOMEM;
  	/*baud = (((priv->clk / 35) * baud_base) / 100000); */
  	baud = baud_base;
  
  	if (baud < 1200 || baud > 230400) {
  		kfree(dataout);
  		return IUU_INVALID_PARAMETER;
  	}
  	if (baud > 977) {
  		T1Frekvens = 3;
  		T1FrekvensHZ = 500000;
  	}
  
  	if (baud > 3906) {
  		T1Frekvens = 2;
  		T1FrekvensHZ = 2000000;
  	}
  
  	if (baud > 11718) {
  		T1Frekvens = 1;
  		T1FrekvensHZ = 6000000;
  	}
  
  	if (baud > 46875) {
  		T1Frekvens = 0;
  		T1FrekvensHZ = 24000000;
  	}
  
  	T1reload = 256 - (u8) (T1FrekvensHZ / (baud * 2));
  
  	/*  magic number here:  ENTER_FIRMWARE_UPDATE; */
  	dataout[DataCount++] = IUU_UART_ESC;
  	/*  magic number here:  CHANGE_BAUD; */
  	dataout[DataCount++] = IUU_UART_CHANGE;
  	dataout[DataCount++] = T1Frekvens;
  	dataout[DataCount++] = T1reload;
  
  	*actual = (T1FrekvensHZ / (256 - T1reload)) / 2;
  
  	switch (parity & 0x0F) {
  	case IUU_PARITY_NONE:
  		dataout[DataCount++] = 0x00;
  		break;
  	case IUU_PARITY_EVEN:
  		dataout[DataCount++] = 0x01;
  		break;
  	case IUU_PARITY_ODD:
  		dataout[DataCount++] = 0x02;
  		break;
  	case IUU_PARITY_MARK:
  		dataout[DataCount++] = 0x03;
  		break;
  	case IUU_PARITY_SPACE:
  		dataout[DataCount++] = 0x04;
  		break;
  	default:
  		kfree(dataout);
  		return IUU_INVALID_PARAMETER;
  		break;
  	}
  
  	switch (parity & 0xF0) {
  	case IUU_ONE_STOP_BIT:
  		dataout[DataCount - 1] |= IUU_ONE_STOP_BIT;
  		break;
  
  	case IUU_TWO_STOP_BITS:
  		dataout[DataCount - 1] |= IUU_TWO_STOP_BITS;
  		break;
  	default:
  		kfree(dataout);
  		return IUU_INVALID_PARAMETER;
  		break;
  	}
  
  	status = bulk_immediate(port, dataout, DataCount);
  	if (status != IUU_OPERATION_OK)
  		dev_dbg(&port->dev, "%s - uart_off error\n", __func__);
  	kfree(dataout);
  	return status;
  }
  
  static void iuu_set_termios(struct tty_struct *tty,
  		struct usb_serial_port *port, struct ktermios *old_termios)
  {
  	const u32 supported_mask = CMSPAR|PARENB|PARODD;
  	struct iuu_private *priv = usb_get_serial_port_data(port);
  	unsigned int cflag = tty->termios.c_cflag;
  	int status;
  	u32 actual;
  	u32 parity;
  	int csize = CS7;
  	int baud;
  	u32 newval = cflag & supported_mask;
  
  	/* Just use the ospeed. ispeed should be the same. */
  	baud = tty->termios.c_ospeed;
  
  	dev_dbg(&port->dev, "%s - enter c_ospeed or baud=%d\n", __func__, baud);
  
  	/* compute the parity parameter */
  	parity = 0;
  	if (cflag & CMSPAR) {	/* Using mark space */
  		if (cflag & PARODD)
  			parity |= IUU_PARITY_SPACE;
  		else
  			parity |= IUU_PARITY_MARK;
  	} else if (!(cflag & PARENB)) {
  		parity |= IUU_PARITY_NONE;
  		csize = CS8;
  	} else if (cflag & PARODD)
  		parity |= IUU_PARITY_ODD;
  	else
  		parity |= IUU_PARITY_EVEN;
  
  	parity |= (cflag & CSTOPB ? IUU_TWO_STOP_BITS : IUU_ONE_STOP_BIT);
  
  	/* set it */
  	status = iuu_uart_baud(port,
  			baud * priv->boost / 100,
  			&actual, parity);
  
  	/* set the termios value to the real one, so the user now what has
  	 * changed. We support few fields so its easies to copy the old hw
  	 * settings back over and then adjust them
  	 */
  	if (old_termios)
  		tty_termios_copy_hw(&tty->termios, old_termios);
  	if (status != 0)	/* Set failed - return old bits */
  		return;
  	/* Re-encode speed, parity and csize */
  	tty_encode_baud_rate(tty, baud, baud);
  	tty->termios.c_cflag &= ~(supported_mask|CSIZE);
  	tty->termios.c_cflag |= newval | csize;
  }
  
  static void iuu_close(struct usb_serial_port *port)
  {
  	/* iuu_led (port,255,0,0,0); */
  
  	iuu_uart_off(port);
  
  	usb_kill_urb(port->write_urb);
  	usb_kill_urb(port->read_urb);
  
  	iuu_led(port, 0, 0, 0xF000, 0xFF);
  }
  
  static void iuu_init_termios(struct tty_struct *tty)
  {
  	tty->termios = tty_std_termios;
  	tty->termios.c_cflag = CLOCAL | CREAD | CS8 | B9600
  				| TIOCM_CTS | CSTOPB | PARENB;
  	tty->termios.c_ispeed = 9600;
  	tty->termios.c_ospeed = 9600;
  	tty->termios.c_lflag = 0;
  	tty->termios.c_oflag = 0;
  	tty->termios.c_iflag = 0;
  }
  
  static int iuu_open(struct tty_struct *tty, struct usb_serial_port *port)
  {
  	struct usb_serial *serial = port->serial;
  	struct device *dev = &port->dev;
  	int result;
  	int baud;
  	u32 actual;
  	struct iuu_private *priv = usb_get_serial_port_data(port);
  
  	baud = tty->termios.c_ospeed;
  
  	dev_dbg(dev, "%s - baud %d\n", __func__, baud);
  	usb_clear_halt(serial->dev, port->write_urb->pipe);
  	usb_clear_halt(serial->dev, port->read_urb->pipe);
  
  	priv->poll = 0;
  
  #define SOUP(a, b, c, d)  do { \
  	result = usb_control_msg(port->serial->dev,	\
  				usb_sndctrlpipe(port->serial->dev, 0),	\
  				b, a, c, d, NULL, 0, 1000); \
  	dev_dbg(dev, "0x%x:0x%x:0x%x:0x%x  %d\n", a, b, c, d, result); } while (0)
  
  	/*  This is not UART related but IUU USB driver related or something */
  	/*  like that. Basically no IUU will accept any commands from the USB */
  	/*  host unless it has received the following message */
  	/* sprintf(buf ,"%c%c%c%c",0x03,0x02,0x02,0x0); */
  
  	SOUP(0x03, 0x02, 0x02, 0x0);
  
  	iuu_led(port, 0xF000, 0xF000, 0, 0xFF);
  	iuu_uart_on(port);
  	if (boost < 100)
  		boost = 100;
  	priv->boost = boost;
  	switch (clockmode) {
  	case 2:		/*  3.680 Mhz */
  		priv->clk = IUU_CLK_3680000;
  		iuu_clk(port, IUU_CLK_3680000 * boost / 100);
  		result =
  		    iuu_uart_baud(port, baud * boost / 100, &actual,
  				  IUU_PARITY_EVEN);
  		break;
  	case 3:		/*  6.00 Mhz */
  		iuu_clk(port, IUU_CLK_6000000 * boost / 100);
  		priv->clk = IUU_CLK_6000000;
  		/* Ratio of 6000000 to 3500000 for baud 9600 */
  		result =
  		    iuu_uart_baud(port, 16457 * boost / 100, &actual,
  				  IUU_PARITY_EVEN);
  		break;
  	default:		/*  3.579 Mhz */
  		iuu_clk(port, IUU_CLK_3579000 * boost / 100);
  		priv->clk = IUU_CLK_3579000;
  		result =
  		    iuu_uart_baud(port, baud * boost / 100, &actual,
  				  IUU_PARITY_EVEN);
  	}
  
  	/* set the cardin cardout signals */
  	switch (cdmode) {
  	case 0:
  		iuu_cardin = 0;
  		iuu_cardout = 0;
  		break;
  	case 1:
  		iuu_cardin = TIOCM_CD;
  		iuu_cardout =  0;
  		break;
  	case 2:
  		iuu_cardin = 0;
  		iuu_cardout = TIOCM_CD;
  		break;
  	case 3:
  		iuu_cardin = TIOCM_DSR;
  		iuu_cardout = 0;
  		break;
  	case 4:
  		iuu_cardin = 0;
  		iuu_cardout = TIOCM_DSR;
  		break;
  	case 5:
  		iuu_cardin = TIOCM_CTS;
  		iuu_cardout = 0;
  		break;
  	case 6:
  		iuu_cardin = 0;
  		iuu_cardout = TIOCM_CTS;
  		break;
  	case 7:
  		iuu_cardin = TIOCM_RNG;
  		iuu_cardout = 0;
  		break;
  	case 8:
  		iuu_cardin = 0;
  		iuu_cardout = TIOCM_RNG;
  	}
  
  	iuu_uart_flush(port);
  
  	dev_dbg(dev, "%s - initialization done\n", __func__);
  
  	memset(port->write_urb->transfer_buffer, IUU_UART_RX, 1);
  	usb_fill_bulk_urb(port->write_urb, port->serial->dev,
  			  usb_sndbulkpipe(port->serial->dev,
  					  port->bulk_out_endpointAddress),
  			  port->write_urb->transfer_buffer, 1,
  			  read_rxcmd_callback, port);
  	result = usb_submit_urb(port->write_urb, GFP_KERNEL);
  	if (result) {
  		dev_err(dev, "%s - failed submitting read urb, error %d\n", __func__, result);
  		iuu_close(port);
  	} else {
  		dev_dbg(dev, "%s - rxcmd OK\n", __func__);
  	}
  
  	return result;
  }
  
  /* how to change VCC */
  static int iuu_vcc_set(struct usb_serial_port *port, unsigned int vcc)
  {
  	int status;
  	u8 *buf;
  
  	buf = kmalloc(5, GFP_KERNEL);
  	if (!buf)
  		return -ENOMEM;
  
  	buf[0] = IUU_SET_VCC;
  	buf[1] = vcc & 0xFF;
  	buf[2] = (vcc >> 8) & 0xFF;
  	buf[3] = (vcc >> 16) & 0xFF;
  	buf[4] = (vcc >> 24) & 0xFF;
  
  	status = bulk_immediate(port, buf, 5);
  	kfree(buf);
  
  	if (status != IUU_OPERATION_OK)
  		dev_dbg(&port->dev, "%s - vcc error status = %2x\n", __func__, status);
  	else
  		dev_dbg(&port->dev, "%s - vcc OK !\n", __func__);
  
  	return status;
  }
  
  /*
   * Sysfs Attributes
   */
  
  static ssize_t vcc_mode_show(struct device *dev,
  	struct device_attribute *attr, char *buf)
  {
  	struct usb_serial_port *port = to_usb_serial_port(dev);
  	struct iuu_private *priv = usb_get_serial_port_data(port);
  
  	return sprintf(buf, "%d\n", priv->vcc);
  }
  
  static ssize_t vcc_mode_store(struct device *dev,
  	struct device_attribute *attr, const char *buf, size_t count)
  {
  	struct usb_serial_port *port = to_usb_serial_port(dev);
  	struct iuu_private *priv = usb_get_serial_port_data(port);
  	unsigned long v;
  
  	if (kstrtoul(buf, 10, &v)) {
  		dev_err(dev, "%s - vcc_mode: %s is not a unsigned long\n",
  				__func__, buf);
  		goto fail_store_vcc_mode;
  	}
  
  	dev_dbg(dev, "%s: setting vcc_mode = %ld\n", __func__, v);
  
  	if ((v != 3) && (v != 5)) {
  		dev_err(dev, "%s - vcc_mode %ld is invalid\n", __func__, v);
  	} else {
  		iuu_vcc_set(port, v);
  		priv->vcc = v;
  	}
  fail_store_vcc_mode:
  	return count;
  }
  static DEVICE_ATTR_RW(vcc_mode);
  
  static int iuu_create_sysfs_attrs(struct usb_serial_port *port)
  {
  	return device_create_file(&port->dev, &dev_attr_vcc_mode);
  }
  
  static int iuu_remove_sysfs_attrs(struct usb_serial_port *port)
  {
  	device_remove_file(&port->dev, &dev_attr_vcc_mode);
  	return 0;
  }
  
  /*
   * End Sysfs Attributes
   */
  
  static struct usb_serial_driver iuu_device = {
  	.driver = {
  		   .owner = THIS_MODULE,
  		   .name = "iuu_phoenix",
  		   },
  	.id_table = id_table,
  	.num_ports = 1,
  	.num_bulk_in = 1,
  	.num_bulk_out = 1,
  	.bulk_in_size = 512,
  	.bulk_out_size = 512,
  	.open = iuu_open,
  	.close = iuu_close,
  	.write = iuu_uart_write,
  	.read_bulk_callback = iuu_uart_read_callback,
  	.tiocmget = iuu_tiocmget,
  	.tiocmset = iuu_tiocmset,
  	.set_termios = iuu_set_termios,
  	.init_termios = iuu_init_termios,
  	.port_probe = iuu_port_probe,
  	.port_remove = iuu_port_remove,
  };
  
  static struct usb_serial_driver * const serial_drivers[] = {
  	&iuu_device, NULL
  };
  
  module_usb_serial_driver(serial_drivers, id_table);
  
  MODULE_AUTHOR("Alain Degreffe eczema@ecze.com");
  
  MODULE_DESCRIPTION(DRIVER_DESC);
  MODULE_LICENSE("GPL");
  
  module_param(xmas, bool, S_IRUGO | S_IWUSR);
  MODULE_PARM_DESC(xmas, "Xmas colors enabled or not");
  
  module_param(boost, int, S_IRUGO | S_IWUSR);
  MODULE_PARM_DESC(boost, "Card overclock boost (in percent 100-500)");
  
  module_param(clockmode, int, S_IRUGO | S_IWUSR);
  MODULE_PARM_DESC(clockmode, "Card clock mode (1=3.579 MHz, 2=3.680 MHz, "
  		"3=6 Mhz)");
  
  module_param(cdmode, int, S_IRUGO | S_IWUSR);
  MODULE_PARM_DESC(cdmode, "Card detect mode (0=none, 1=CD, 2=!CD, 3=DSR, "
  		 "4=!DSR, 5=CTS, 6=!CTS, 7=RING, 8=!RING)");
  
  module_param(vcc_default, int, S_IRUGO | S_IWUSR);
  MODULE_PARM_DESC(vcc_default, "Set default VCC (either 3 for 3.3V or 5 "
  		"for 5V). Default to 5.");
  