Commit 63b91767 authored by Mike Dunn's avatar Mike Dunn Committed by Greg Kroah-Hartman
Browse files

USB: usbserial: mos7720: cleanup, consolidation, replace send_mos_cmd with {read,write}_mos_reg 



No functionality added or bugs fixed, just improved code consistency and
(hopefully) readability by replacing send_mos_cmd with the register read & write
functions that were used for parallel port registers.  Also shortens overall
file length.

Thoroughly tested, with emphasis on regression testing the serial port.

Signed-off-by: default avatarMike Dunn <mikedunn@newsguy.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
parent b69578df

drivers/usb/serial/mos7720.c

+122 −266
Original line number Diff line number Diff line
@@ -39,16 +39,13 @@ 
/*

 * Version Information

 */

#define DRIVER_VERSION "2.0"

#define DRIVER_VERSION "2.1"

#define DRIVER_AUTHOR "Aspire Communications pvt Ltd."

#define DRIVER_DESC "Moschip USB Serial Driver"



/* default urb timeout */

#define MOS_WDR_TIMEOUT	(HZ * 5)



#define MOS_PORT1	0x0200

#define MOS_PORT2	0x0300

#define MOS_VENREG	0x0000

#define MOS_MAX_PORT	0x02

#define MOS_WRITE	0x0E

#define MOS_READ	0x0D
@@ -126,6 +123,10 @@ struct mos7715_parport { 
/* lock guards against dereferencing NULL ptr in parport ops callbacks */

static DEFINE_SPINLOCK(release_lock);



#endif	/* CONFIG_USB_SERIAL_MOS7715_PARPORT */



static const unsigned int dummy; /* for clarity in register access fns */



enum mos_regs {

	THR,	          /* serial port regs */

	RHR,
@@ -184,32 +185,35 @@ static inline __u16 get_reg_index(enum mos_regs reg) 
 * Return the correct value for the upper byte of the Wvalue field of

 * the setup packet for a control endpoint message.

 */

static inline __u16 get_reg_value(enum mos_regs reg)

static inline __u16 get_reg_value(enum mos_regs reg,

				  unsigned int serial_portnum)

{

	if (reg >= SP1_REG)	      /* control reg */

		return 0x0000;

	else			      /* parallel port reg (7715 only) */



	else if (reg >= DPR)	      /* parallel port reg (7715 only) */

		return 0x0100;



	else			      /* serial port reg */

		return (serial_portnum + 2) << 8;

}



/*

 * Write data byte to the specified device register.  The data is embedded in

 * the value field of the setup packet.

 * the value field of the setup packet. serial_portnum is ignored for registers

 * not specific to a particular serial port.

 */

static int write_parport_reg(struct mos7715_parport *mos_parport,

static int write_mos_reg(struct usb_serial *serial, unsigned int serial_portnum,

			 enum mos_regs reg, __u8 data)

{

	struct usb_serial *serial = mos_parport->serial;

	struct usb_device *usbdev = serial->dev;

	unsigned int pipe = usb_sndctrlpipe(usbdev, 0);

	__u8 request = (__u8)0x0e;

	__u8 requesttype = (__u8)0x40;

	__u16 value = get_reg_value(reg) + data;

	__u16 index = get_reg_index(reg);

	__u16 size = 0;

	int status;

	status = usb_control_msg(usbdev, pipe, request, requesttype, value,

				 index, NULL, size, MOS_WDR_TIMEOUT);

	__u16 value = get_reg_value(reg, serial_portnum) + data;

	int status = usb_control_msg(usbdev, pipe, request, requesttype, value,

				     index, NULL, 0, MOS_WDR_TIMEOUT);

	if (status < 0)

		dev_err(&usbdev->dev,

			"mos7720: usb_control_msg() failed: %d", status);
@@ -218,31 +222,33 @@ static int write_parport_reg(struct mos7715_parport *mos_parport, 


/*

 * Read data byte from the specified device register.  The data returned by the

 * device is embedded in the value field of the setup packet.

 * device is embedded in the value field of the setup packet.  serial_portnum is

 * ignored for registers that are not specific to a particular serial port.

 */

static int read_parport_reg(struct mos7715_parport *mos_parport,

static int read_mos_reg(struct usb_serial *serial, unsigned int serial_portnum,

			enum mos_regs reg, __u8 *data)

{

	struct usb_device *usbdev = mos_parport->serial->dev;

	struct usb_device *usbdev = serial->dev;

	unsigned int pipe = usb_rcvctrlpipe(usbdev, 0);

	__u8 request = (__u8)0x0d;

	__u8 requesttype = (__u8)0xc0;

	__u16 value = get_reg_value(reg);

	__u16 index = get_reg_index(reg);

	__u16 size = 1;

	__u16 value = get_reg_value(reg, serial_portnum);

	int status = usb_control_msg(usbdev, pipe, request, requesttype, value,

				     index, data, size, MOS_WDR_TIMEOUT);

				     index, data, 1, MOS_WDR_TIMEOUT);

	if (status < 0)

		dev_err(&usbdev->dev,

			"mos7720: usb_control_msg() failed: %d", status);

	return status;

}



#ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT



static inline int mos7715_change_mode(struct mos7715_parport *mos_parport,

				      enum mos7715_pp_modes mode)

{

	mos_parport->shadowECR = mode;

	write_parport_reg(mos_parport, ECR, mos_parport->shadowECR);

	write_mos_reg(mos_parport->serial, dummy, ECR, mos_parport->shadowECR);

	return 0;

}
@@ -367,7 +373,7 @@ static int write_parport_reg_nonblock(struct mos7715_parport *mos_parport, 
	}

	setup.bRequestType = (__u8)0x40;

	setup.bRequest = (__u8)0x0e;

	setup.wValue = get_reg_value(reg);

	setup.wValue = get_reg_value(reg, dummy);

	setup.wIndex = get_reg_index(reg);

	setup.wLength = 0;

	usb_fill_control_urb(urbtrack->urb, usbdev,
@@ -474,7 +480,7 @@ static void parport_mos7715_write_data(struct parport *pp, unsigned char d) 
	if (parport_prologue(pp) < 0)

		return;

	mos7715_change_mode(mos_parport, SPP);

	write_parport_reg(mos_parport, DPR, (__u8)d);

	write_mos_reg(mos_parport->serial, dummy, DPR, (__u8)d);

	parport_epilogue(pp);

}
@@ -485,7 +491,7 @@ static unsigned char parport_mos7715_read_data(struct parport *pp) 
	dbg("%s called", __func__);

	if (parport_prologue(pp) < 0)

		return 0;

	read_parport_reg(mos_parport, DPR, &d);

	read_mos_reg(mos_parport->serial, dummy, DPR, &d);

	parport_epilogue(pp);

	return d;

}
@@ -498,7 +504,7 @@ static void parport_mos7715_write_control(struct parport *pp, unsigned char d) 
	if (parport_prologue(pp) < 0)

		return;

	data = ((__u8)d & 0x0f) | (mos_parport->shadowDCR & 0xf0);

	write_parport_reg(mos_parport, DCR, data);

	write_mos_reg(mos_parport->serial, dummy, DCR, data);

	mos_parport->shadowDCR = data;

	parport_epilogue(pp);

}
@@ -531,7 +537,7 @@ static unsigned char parport_mos7715_frob_control(struct parport *pp, 
	if (parport_prologue(pp) < 0)

		return 0;

	mos_parport->shadowDCR = (mos_parport->shadowDCR & (~mask)) ^ val;

	write_parport_reg(mos_parport, DCR, mos_parport->shadowDCR);

	write_mos_reg(mos_parport->serial, dummy, DCR, mos_parport->shadowDCR);

	dcr = mos_parport->shadowDCR & 0x0f;

	parport_epilogue(pp);

	return dcr;
@@ -570,7 +576,7 @@ static void parport_mos7715_data_forward(struct parport *pp) 
		return;

	mos7715_change_mode(mos_parport, PS2);

	mos_parport->shadowDCR &=  ~0x20;

	write_parport_reg(mos_parport, DCR, mos_parport->shadowDCR);

	write_mos_reg(mos_parport->serial, dummy, DCR, mos_parport->shadowDCR);

	parport_epilogue(pp);

}
@@ -582,7 +588,7 @@ static void parport_mos7715_data_reverse(struct parport *pp) 
		return;

	mos7715_change_mode(mos_parport, PS2);

	mos_parport->shadowDCR |= 0x20;

	write_parport_reg(mos_parport, DCR, mos_parport->shadowDCR);

	write_mos_reg(mos_parport->serial, dummy, DCR, mos_parport->shadowDCR);

	parport_epilogue(pp);

}
@@ -705,14 +711,14 @@ static int mos7715_parport_init(struct usb_serial *serial) 
	init_completion(&mos_parport->syncmsg_compl);



	/* cycle parallel port reset bit */

	write_parport_reg(mos_parport, PP_REG, (__u8)0x80);

	write_parport_reg(mos_parport, PP_REG, (__u8)0x00);

	write_mos_reg(mos_parport->serial, dummy, PP_REG, (__u8)0x80);

	write_mos_reg(mos_parport->serial, dummy, PP_REG, (__u8)0x00);



	/* initialize device registers */

	mos_parport->shadowDCR = DCR_INIT_VAL;

	write_parport_reg(mos_parport, DCR, mos_parport->shadowDCR);

	write_mos_reg(mos_parport->serial, dummy, DCR, mos_parport->shadowDCR);

	mos_parport->shadowECR = ECR_INIT_VAL;

	write_parport_reg(mos_parport, ECR, mos_parport->shadowECR);

	write_mos_reg(mos_parport->serial, dummy, ECR, mos_parport->shadowECR);



	/* register with parport core */

	mos_parport->pp = parport_register_port(0, PARPORT_IRQ_NONE,
@@ -754,7 +760,6 @@ static void mos7720_interrupt_callback(struct urb *urb) 
	case -ECONNRESET:

	case -ENOENT:

	case -ESHUTDOWN:

	case -ENODEV:

		/* this urb is terminated, clean up */

		dbg("%s - urb shutting down with status: %d", __func__,

		    status);
@@ -980,56 +985,6 @@ static void mos7720_bulk_out_data_callback(struct urb *urb) 
	tty_kref_put(tty);

}



/*

 * send_mos_cmd

 *	this function will be used for sending command to device

 */

static int send_mos_cmd(struct usb_serial *serial, __u8 request, __u16 value,

			__u16 index, u8 *data)

{

	int status;

	u8 *buf;

	u16 product = le16_to_cpu(serial->dev->descriptor.idProduct);



	if (value < MOS_MAX_PORT) {

		if (product == MOSCHIP_DEVICE_ID_7715)

			value = 0x0200; /* identifies the 7715's serial port */

		else

			value = value*0x100+0x200;

	} else {

		value = 0x0000;

		if ((product == MOSCHIP_DEVICE_ID_7715) &&

		    (index != 0x08)) {

			dbg("serial->product== MOSCHIP_DEVICE_ID_7715");

			/* index = 0x01 ; */

		}

	}



	if (request == MOS_WRITE) {

		value = value + *data;

		status = usb_control_msg(serial->dev,

				usb_sndctrlpipe(serial->dev, 0), MOS_WRITE,

				0x40, value, index, NULL, 0, MOS_WDR_TIMEOUT);

	} else {

		buf = kmalloc(1, GFP_KERNEL);

		if (!buf) {

			status = -ENOMEM;

			goto out;

		}

		status = usb_control_msg(serial->dev,

				usb_rcvctrlpipe(serial->dev, 0), MOS_READ,

				0xc0, value, index, buf, 1, MOS_WDR_TIMEOUT);

		*data = *buf;

		kfree(buf);

	}

out:

	if (status < 0)

		dbg("Command Write failed Value %x index %x", value, index);



	return status;

}





/*

 * mos77xx_probe

 *	this function installs the appropriate read interrupt endpoint callback
@@ -1066,7 +1021,7 @@ static int mos7720_open(struct tty_struct *tty, struct usb_serial_port *port) 
	struct moschip_port *mos7720_port;

	int response;

	int port_number;

	char data;

	__u8 data;

	int allocated_urbs = 0;

	int j;
@@ -1122,65 +1077,35 @@ static int mos7720_open(struct tty_struct *tty, struct usb_serial_port *port) 
	  * 0x08 : SP1/2 Control Reg

	  */

	port_number = port->number - port->serial->minor;

	send_mos_cmd(port->serial, MOS_READ, port_number, UART_LSR, &data);

	read_mos_reg(serial, port_number, LSR, &data);



	dbg("SS::%p LSR:%x", mos7720_port, data);



	dbg("Check:Sending Command ..........");



	data = 0x02;

	send_mos_cmd(serial, MOS_WRITE, MOS_MAX_PORT, 0x01, &data);

	data = 0x02;

	send_mos_cmd(serial, MOS_WRITE, MOS_MAX_PORT, 0x02, &data);

	write_mos_reg(serial, dummy, SP1_REG, 0x02);

	write_mos_reg(serial, dummy, SP2_REG, 0x02);



	data = 0x00;

	send_mos_cmd(serial, MOS_WRITE, port_number, 0x01, &data);

	data = 0x00;

	send_mos_cmd(serial, MOS_WRITE, port_number, 0x02, &data);

	write_mos_reg(serial, port_number, IER, 0x00);

	write_mos_reg(serial, port_number, FCR, 0x00);



	data = 0xCF;

	send_mos_cmd(serial, MOS_WRITE, port_number, 0x02, &data);

	data = 0x03;

	mos7720_port->shadowLCR  = data;

	send_mos_cmd(serial, MOS_WRITE, port_number, 0x03, &data);

	data = 0x0b;

	mos7720_port->shadowMCR  = data;

	send_mos_cmd(serial, MOS_WRITE, port_number, 0x04, &data);

	data = 0x0b;

	send_mos_cmd(serial, MOS_WRITE, port_number, 0x04, &data);



	data = 0x00;

	send_mos_cmd(serial, MOS_READ, MOS_MAX_PORT, 0x08, &data);

	data = 0x00;

	send_mos_cmd(serial, MOS_WRITE, MOS_MAX_PORT, 0x08, &data);



/*	data = 0x00;

	send_mos_cmd(serial, MOS_READ, MOS_MAX_PORT, port_number + 1, &data);

	data = 0x03;

	send_mos_cmd(serial, MOS_WRITE, MOS_MAX_PORT, port_number + 1, &data);

	data = 0x00;

	send_mos_cmd(port->serial, MOS_WRITE, MOS_MAX_PORT,

						port_number + 1, &data);

*/

	data = 0x00;

	send_mos_cmd(serial, MOS_READ, MOS_MAX_PORT, 0x08, &data);

	write_mos_reg(serial, port_number, FCR, 0xcf);

	mos7720_port->shadowLCR = 0x03;

	write_mos_reg(serial, port_number, LCR, mos7720_port->shadowLCR);

	mos7720_port->shadowMCR = 0x0b;

	write_mos_reg(serial, port_number, MCR, mos7720_port->shadowMCR);



	write_mos_reg(serial, port_number, SP_CONTROL_REG, 0x00);

	read_mos_reg(serial, dummy, SP_CONTROL_REG, &data);

	data = data | (port->number - port->serial->minor + 1);

	send_mos_cmd(serial, MOS_WRITE, MOS_MAX_PORT, 0x08, &data);



	data = 0x83;

	mos7720_port->shadowLCR  = data;

	send_mos_cmd(serial, MOS_WRITE, port_number, 0x03, &data);

	data = 0x0c;

	send_mos_cmd(serial, MOS_WRITE, port_number, 0x00, &data);

	data = 0x00;

	send_mos_cmd(serial, MOS_WRITE, port_number, 0x01, &data);

	data = 0x03;

	mos7720_port->shadowLCR  = data;

	send_mos_cmd(serial, MOS_WRITE, port_number, 0x03, &data);

	data = 0x0c;

	send_mos_cmd(serial, MOS_WRITE, port_number, 0x01, &data);

	data = 0x0c;

	send_mos_cmd(serial, MOS_WRITE, port_number, 0x01, &data);

	write_mos_reg(serial, dummy, SP_CONTROL_REG, data);

	mos7720_port->shadowLCR = 0x83;

	write_mos_reg(serial, port_number, LCR, mos7720_port->shadowLCR);

	write_mos_reg(serial, port_number, THR, 0x0c);

	write_mos_reg(serial, port_number, IER, 0x00);

	mos7720_port->shadowLCR = 0x03;

	write_mos_reg(serial, port_number, LCR, mos7720_port->shadowLCR);

	write_mos_reg(serial, port_number, IER, 0x0c);



	response = usb_submit_urb(port->read_urb, GFP_KERNEL);

	if (response)
@@ -1236,7 +1161,6 @@ static void mos7720_close(struct usb_serial_port *port) 
{

	struct usb_serial *serial;

	struct moschip_port *mos7720_port;

	char data;

	int j;



	dbg("mos7720_close:entering...");
@@ -1269,13 +1193,10 @@ static void mos7720_close(struct usb_serial_port *port) 
	/* these commands must not be issued if the device has

	 * been disconnected */

	if (!serial->disconnected) {

		data = 0x00;

		send_mos_cmd(serial, MOS_WRITE,

			port->number - port->serial->minor, 0x04, &data);



		data = 0x00;

		send_mos_cmd(serial, MOS_WRITE,

			port->number - port->serial->minor, 0x01, &data);

		write_mos_reg(serial, port->number - port->serial->minor,

			      MCR, 0x00);

		write_mos_reg(serial, port->number - port->serial->minor,

			      IER, 0x00);

	}

	mutex_unlock(&serial->disc_mutex);

	mos7720_port->open = 0;
@@ -1304,8 +1225,8 @@ static void mos7720_break(struct tty_struct *tty, int break_state) 
		data = mos7720_port->shadowLCR & ~UART_LCR_SBC;



	mos7720_port->shadowLCR  = data;

	send_mos_cmd(serial, MOS_WRITE, port->number - port->serial->minor,

		     0x03, &data);

	write_mos_reg(serial, port->number - port->serial->minor,

		      LCR, mos7720_port->shadowLCR);



	return;

}
@@ -1450,9 +1371,8 @@ static void mos7720_throttle(struct tty_struct *tty) 
	/* if we are implementing RTS/CTS, toggle that line */

	if (tty->termios->c_cflag & CRTSCTS) {

		mos7720_port->shadowMCR &= ~UART_MCR_RTS;

		status = send_mos_cmd(port->serial, MOS_WRITE,

				      port->number - port->serial->minor,

				      UART_MCR, &mos7720_port->shadowMCR);

		write_mos_reg(port->serial, port->number - port->serial->minor,

			      MCR, mos7720_port->shadowMCR);

		if (status != 0)

			return;

	}
@@ -1485,9 +1405,8 @@ static void mos7720_unthrottle(struct tty_struct *tty) 
	/* if we are implementing RTS/CTS, toggle that line */

	if (tty->termios->c_cflag & CRTSCTS) {

		mos7720_port->shadowMCR |= UART_MCR_RTS;

		status = send_mos_cmd(port->serial, MOS_WRITE,

				      port->number - port->serial->minor,

				      UART_MCR, &mos7720_port->shadowMCR);

		write_mos_reg(port->serial, port->number - port->serial->minor,

			      MCR, mos7720_port->shadowMCR);

		if (status != 0)

			return;

	}
@@ -1497,11 +1416,10 @@ static void mos7720_unthrottle(struct tty_struct *tty) 
static int set_higher_rates(struct moschip_port *mos7720_port,

			    unsigned int baud)

{

	unsigned char data;

	struct usb_serial_port *port;

	struct usb_serial *serial;

	int port_number;



	enum mos_regs sp_reg;

	if (mos7720_port == NULL)

		return -EINVAL;
@@ -1514,59 +1432,35 @@ static int set_higher_rates(struct moschip_port *mos7720_port, 
	dbg("Sending Setting Commands ..........");

	port_number = port->number - port->serial->minor;



	data = 0x000;

	send_mos_cmd(serial, MOS_WRITE, port_number, 0x01, &data);

	data = 0x000;

	send_mos_cmd(serial, MOS_WRITE, port_number, 0x02, &data);

	data = 0x0CF;

	send_mos_cmd(serial, MOS_WRITE, port->number, 0x02, &data);

	data = 0x00b;

	mos7720_port->shadowMCR  = data;

	send_mos_cmd(serial, MOS_WRITE, port_number, 0x04, &data);

	data = 0x00b;

	send_mos_cmd(serial, MOS_WRITE, port_number, 0x04, &data);



	data = 0x000;

	send_mos_cmd(serial, MOS_READ, MOS_MAX_PORT, 0x08, &data);

	data = 0x000;

	send_mos_cmd(serial, MOS_WRITE, MOS_MAX_PORT, 0x08, &data);



	write_mos_reg(serial, port_number, IER, 0x00);

	write_mos_reg(serial, port_number, FCR, 0x00);

	write_mos_reg(serial, port_number, FCR, 0xcf);

	mos7720_port->shadowMCR = 0x0b;

	write_mos_reg(serial, port_number, MCR, mos7720_port->shadowMCR);

	write_mos_reg(serial, dummy, SP_CONTROL_REG, 0x00);



	/***********************************************

	 *              Set for higher rates           *

	 ***********************************************/



	/* writing baud rate verbatum into uart clock field clearly not right */

	data = baud * 0x10;

	send_mos_cmd(serial, MOS_WRITE, MOS_MAX_PORT, port_number + 1, &data);



	data = 0x003;

	send_mos_cmd(serial, MOS_READ, MOS_MAX_PORT, 0x08, &data);

	data = 0x003;

	send_mos_cmd(serial, MOS_WRITE, MOS_MAX_PORT, 0x08, &data);



	data = 0x02b;

	mos7720_port->shadowMCR  = data;

	send_mos_cmd(serial, MOS_WRITE, port_number, 0x04, &data);

	data = 0x02b;

	send_mos_cmd(serial, MOS_WRITE, port_number, 0x04, &data);

	if (port_number == 0)

		sp_reg = SP1_REG;

	else

		sp_reg = SP2_REG;

	write_mos_reg(serial, dummy, sp_reg, baud * 0x10);

	write_mos_reg(serial, dummy, SP_CONTROL_REG, 0x03);

	mos7720_port->shadowMCR = 0x2b;

	write_mos_reg(serial, port_number, MCR, mos7720_port->shadowMCR);



	/***********************************************

	 *              Set DLL/DLM

	 ***********************************************/



	data = mos7720_port->shadowLCR | UART_LCR_DLAB;

	mos7720_port->shadowLCR  = data;

	send_mos_cmd(serial, MOS_WRITE, port_number, 0x03, &data);



	data =  0x001; /* DLL */

	send_mos_cmd(serial, MOS_WRITE, port_number, 0x00, &data);

	data =  0x000; /* DLM */

	send_mos_cmd(serial, MOS_WRITE, port_number, 0x01, &data);



	data = mos7720_port->shadowLCR & ~UART_LCR_DLAB;

	mos7720_port->shadowLCR  = data;

	send_mos_cmd(serial, MOS_WRITE, port_number, 0x03, &data);

	mos7720_port->shadowLCR = mos7720_port->shadowLCR | UART_LCR_DLAB;

	write_mos_reg(serial, port_number, LCR, mos7720_port->shadowLCR);

	write_mos_reg(serial, port_number, DLL, 0x01);

	write_mos_reg(serial, port_number, DLM, 0x00);

	mos7720_port->shadowLCR = mos7720_port->shadowLCR & ~UART_LCR_DLAB;

	write_mos_reg(serial, port_number, LCR, mos7720_port->shadowLCR);



	return 0;

}
@@ -1654,7 +1548,6 @@ static int send_cmd_write_baud_rate(struct moschip_port *mos7720_port, 
	struct usb_serial *serial;

	int divisor;

	int status;

	unsigned char data;

	unsigned char number;



	if (mos7720_port == NULL)
@@ -1676,21 +1569,16 @@ static int send_cmd_write_baud_rate(struct moschip_port *mos7720_port, 
	}



	/* Enable access to divisor latch */

	data = mos7720_port->shadowLCR | UART_LCR_DLAB;

	mos7720_port->shadowLCR  = data;

	send_mos_cmd(serial, MOS_WRITE, number, UART_LCR, &data);

	mos7720_port->shadowLCR = mos7720_port->shadowLCR | UART_LCR_DLAB;

	write_mos_reg(serial, number, LCR, mos7720_port->shadowLCR);



	/* Write the divisor */

	data = ((unsigned char)(divisor & 0xff));

	send_mos_cmd(serial, MOS_WRITE, number, 0x00, &data);



	data = ((unsigned char)((divisor & 0xff00) >> 8));

	send_mos_cmd(serial, MOS_WRITE, number, 0x01, &data);

	write_mos_reg(serial, number, DLL, (__u8)(divisor & 0xff));

	write_mos_reg(serial, number, DLM, (__u8)((divisor & 0xff00) >> 8));



	/* Disable access to divisor latch */

	data = mos7720_port->shadowLCR & ~UART_LCR_DLAB;

	mos7720_port->shadowLCR = data;

	send_mos_cmd(serial, MOS_WRITE, number, 0x03, &data);

	mos7720_port->shadowLCR = mos7720_port->shadowLCR & ~UART_LCR_DLAB;

	write_mos_reg(serial, number, LCR, mos7720_port->shadowLCR);



	return status;

}
@@ -1715,7 +1603,6 @@ static void change_port_settings(struct tty_struct *tty, 
	__u8 lStop;

	int status;

	int port_number;

	char data;



	if (mos7720_port == NULL)

		return ;
@@ -1799,25 +1686,14 @@ static void change_port_settings(struct tty_struct *tty, 




	/* Disable Interrupts */

	data = 0x00;

	send_mos_cmd(serial, MOS_WRITE, port->number - port->serial->minor,

							UART_IER, &data);



	data = 0x00;

	send_mos_cmd(serial, MOS_WRITE, port_number, UART_FCR, &data);



	data = 0xcf;

	send_mos_cmd(serial, MOS_WRITE, port_number, UART_FCR, &data);

	write_mos_reg(serial, port_number, IER, 0x00);

	write_mos_reg(serial, port_number, FCR, 0x00);

	write_mos_reg(serial, port_number, FCR, 0xcf);



	/* Send the updated LCR value to the mos7720 */

	data = mos7720_port->shadowLCR;

	send_mos_cmd(serial, MOS_WRITE, port_number, UART_LCR, &data);



	data = 0x00b;

	mos7720_port->shadowMCR = data;

	send_mos_cmd(serial, MOS_WRITE, port_number, 0x04, &data);

	data = 0x00b;

	send_mos_cmd(serial, MOS_WRITE, port_number, 0x04, &data);

	write_mos_reg(serial, port_number, LCR, mos7720_port->shadowLCR);

	mos7720_port->shadowMCR = 0x0b;

	write_mos_reg(serial, port_number, MCR, mos7720_port->shadowMCR);



	/* set up the MCR register and send it to the mos7720 */

	mos7720_port->shadowMCR = UART_MCR_OUT2;
@@ -1828,21 +1704,15 @@ static void change_port_settings(struct tty_struct *tty, 
		mos7720_port->shadowMCR |= (UART_MCR_XONANY);

		/* To set hardware flow control to the specified *

		 * serial port, in SP1/2_CONTROL_REG             */

		if (port->number) {

			data = 0x001;

			send_mos_cmd(serial, MOS_WRITE, MOS_MAX_PORT,

				     0x08, &data);

		} else {

			data = 0x002;

			send_mos_cmd(serial, MOS_WRITE, MOS_MAX_PORT,

				     0x08, &data);

		}

	} else {

		if (port->number)

			write_mos_reg(serial, dummy, SP_CONTROL_REG, 0x01);

		else

			write_mos_reg(serial, dummy, SP_CONTROL_REG, 0x02);



	} else

		mos7720_port->shadowMCR &= ~(UART_MCR_XONANY);

	}



	data = mos7720_port->shadowMCR;

	send_mos_cmd(serial, MOS_WRITE, port_number, UART_MCR, &data);

	write_mos_reg(serial, port_number, MCR, mos7720_port->shadowMCR);



	/* Determine divisor based on baud rate */

	baud = tty_get_baud_rate(tty);
@@ -1855,8 +1725,7 @@ static void change_port_settings(struct tty_struct *tty, 
	if (baud >= 230400) {

		set_higher_rates(mos7720_port, baud);

		/* Enable Interrupts */

		data = 0x0c;

		send_mos_cmd(serial, MOS_WRITE, port_number, UART_IER, &data);

		write_mos_reg(serial, port_number, IER, 0x0c);

		return;

	}
@@ -1867,8 +1736,7 @@ static void change_port_settings(struct tty_struct *tty, 
	if (cflag & CBAUD)

		tty_encode_baud_rate(tty, baud, baud);

	/* Enable Interrupts */

	data = 0x0c;

	send_mos_cmd(serial, MOS_WRITE, port_number, UART_IER, &data);

	write_mos_reg(serial, port_number, IER, 0x0c);



	if (port->read_urb->status != -EINPROGRESS) {

		port->read_urb->dev = serial->dev;
@@ -1959,8 +1827,7 @@ static int get_lsr_info(struct tty_struct *tty, 


	count = mos7720_chars_in_buffer(tty);

	if (count == 0) {

		send_mos_cmd(port->serial, MOS_READ, port_number,

							UART_LSR, &data);

		read_mos_reg(port->serial, port_number, LSR, &data);

		if ((data & (UART_LSR_TEMT | UART_LSR_THRE))

					== (UART_LSR_TEMT | UART_LSR_THRE)) {

			dbg("%s -- Empty", __func__);
@@ -2003,8 +1870,6 @@ static int mos7720_tiocmset(struct tty_struct *tty, struct file *file, 
	struct usb_serial_port *port = tty->driver_data;

	struct moschip_port *mos7720_port = usb_get_serial_port_data(port);

	unsigned int mcr ;

	unsigned char lmcr;



	dbg("%s - port %d", __func__, port->number);

	dbg("he was at tiocmget");
@@ -2025,10 +1890,8 @@ static int mos7720_tiocmset(struct tty_struct *tty, struct file *file, 
		mcr &= ~UART_MCR_LOOP;



	mos7720_port->shadowMCR = mcr;

	lmcr = mos7720_port->shadowMCR;



	send_mos_cmd(port->serial, MOS_WRITE,

		port->number - port->serial->minor, UART_MCR, &lmcr);

	write_mos_reg(port->serial, port->number - port->serial->minor,

		      MCR, mos7720_port->shadowMCR);



	return 0;

}
@@ -2038,7 +1901,6 @@ static int set_modem_info(struct moschip_port *mos7720_port, unsigned int cmd, 
{

	unsigned int mcr ;

	unsigned int arg;

	unsigned char data;



	struct usb_serial_port *port;
@@ -2073,10 +1935,8 @@ static int set_modem_info(struct moschip_port *mos7720_port, unsigned int cmd, 
	}



	mos7720_port->shadowMCR = mcr;



	data = mos7720_port->shadowMCR;

	send_mos_cmd(port->serial, MOS_WRITE,

		     port->number - port->serial->minor, UART_MCR, &data);

	write_mos_reg(port->serial, port->number - port->serial->minor,

		      MCR, mos7720_port->shadowMCR);



	return 0;

}
@@ -2269,11 +2129,7 @@ static int mos7720_startup(struct usb_serial *serial) 
	}

#endif

	/* LSR For Port 1 */

	send_mos_cmd(serial, MOS_READ, 0x00, UART_LSR, &data);

	dbg("LSR:%x", data);



	/* LSR For Port 2 */

	send_mos_cmd(serial, MOS_READ, 0x01, UART_LSR, &data);

	read_mos_reg(serial, 0, LSR, &data);

	dbg("LSR:%x", data);



	return 0;

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