mos7720.c

linux 内核源代码

	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);

	/* 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);

	/* set up the MCR register and send it to the mos7720 */
	mos7720_port->shadowMCR = UART_MCR_OUT2;
	if (cflag & CBAUD)
		mos7720_port->shadowMCR |= (UART_MCR_DTR | UART_MCR_RTS);

	if (cflag & CRTSCTS) {
		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 {
		mos7720_port->shadowMCR &= ~(UART_MCR_XONANY);
	}

	data = mos7720_port->shadowMCR;
	send_mos_cmd(serial, MOS_WRITE, port_number, UART_MCR, &data);

	/* Determine divisor based on baud rate */
	baud = tty_get_baud_rate(tty);
	if (!baud) {
		/* pick a default, any default... */
		dbg("Picked default baud...");
		baud = 9600;
	}

	if (baud >= 230400) {
		set_higher_rates(mos7720_port, baud);
		/* Enable Interrupts */
		data = 0x0c;
		send_mos_cmd(serial, MOS_WRITE, port_number, UART_IER, &data);
		return;
	}

	dbg("%s - baud rate = %d", __FUNCTION__, baud);
	status = send_cmd_write_baud_rate(mos7720_port, baud);

	/* Enable Interrupts */
	data = 0x0c;
	send_mos_cmd(serial, MOS_WRITE, port_number, UART_IER, &data);

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

		status = usb_submit_urb(port->read_urb, GFP_ATOMIC);
		if (status)
			dbg("usb_submit_urb(read bulk) failed, status = %d",
			    status);
	}
	return;
}

/*
 * mos7720_set_termios
 *	this function is called by the tty driver when it wants to change the
 *	termios structure.
 */
static void mos7720_set_termios(struct usb_serial_port *port,
				struct ktermios *old_termios)
{
	int status;
	unsigned int cflag;
	struct usb_serial *serial;
	struct moschip_port *mos7720_port;
	struct tty_struct *tty;

	serial = port->serial;

	mos7720_port = usb_get_serial_port_data(port);

	if (mos7720_port == NULL)
		return;

	tty = port->tty;

	if (!port->tty || !port->tty->termios) {
		dbg("%s - no tty or termios", __FUNCTION__);
		return;
	}

	if (!mos7720_port->open) {
		dbg("%s - port not opened", __FUNCTION__);
		return;
	}

	dbg("%s\n","setting termios - ASPIRE");

	cflag = tty->termios->c_cflag;

	if (!cflag) {
		printk("%s %s\n",__FUNCTION__,"cflag is NULL");
		return;
	}

	dbg("%s - clfag %08x iflag %08x", __FUNCTION__,
	    tty->termios->c_cflag,
	    RELEVANT_IFLAG(tty->termios->c_iflag));

	if (old_termios)
		dbg("%s - old clfag %08x old iflag %08x", __FUNCTION__,
		    old_termios->c_cflag,
		    RELEVANT_IFLAG(old_termios->c_iflag));

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

	/* change the port settings to the new ones specified */
	change_port_settings(mos7720_port, old_termios);

	if(!port->read_urb) {
		dbg("%s","URB KILLED !!!!!\n");
		return;
	}

	if(port->read_urb->status != -EINPROGRESS) {
		port->read_urb->dev = serial->dev;
		status = usb_submit_urb(port->read_urb, GFP_ATOMIC);
		if (status)
			dbg("usb_submit_urb(read bulk) failed, status = %d",
			    status);
	}
	return;
}

/*
 * get_lsr_info - get line status register info
 *
 * Purpose: Let user call ioctl() to get info when the UART physically
 * 	    is emptied.  On bus types like RS485, the transmitter must
 * 	    release the bus after transmitting. This must be done when
 * 	    the transmit shift register is empty, not be done when the
 * 	    transmit holding register is empty.  This functionality
 * 	    allows an RS485 driver to be written in user space.
 */
static int get_lsr_info(struct moschip_port *mos7720_port,
			unsigned int __user *value)
{
	int count;
	unsigned int result = 0;

	count = mos7720_chars_in_buffer(mos7720_port->port);
	if (count == 0) {
		dbg("%s -- Empty", __FUNCTION__);
		result = TIOCSER_TEMT;
	}

	if (copy_to_user(value, &result, sizeof(int)))
		return -EFAULT;
	return 0;
}

/*
 * get_number_bytes_avail - get number of bytes available
 *
 * Purpose: Let user call ioctl to get the count of number of bytes available.
 */
static int get_number_bytes_avail(struct moschip_port *mos7720_port,
				  unsigned int __user *value)
{
	unsigned int result = 0;
	struct tty_struct *tty = mos7720_port->port->tty;

	if (!tty)
		return -ENOIOCTLCMD;

	result = tty->read_cnt;

	dbg("%s(%d) = %d", __FUNCTION__,  mos7720_port->port->number, result);
	if (copy_to_user(value, &result, sizeof(int)))
		return -EFAULT;

	return -ENOIOCTLCMD;
}

static int set_modem_info(struct moschip_port *mos7720_port, unsigned int cmd,
			  unsigned int __user *value)
{
	unsigned int mcr ;
	unsigned int arg;
	unsigned char data;

	struct usb_serial_port *port;

	if (mos7720_port == NULL)
		return -1;

	port = (struct usb_serial_port*)mos7720_port->port;
	mcr = mos7720_port->shadowMCR;

	if (copy_from_user(&arg, value, sizeof(int)))
		return -EFAULT;

	switch (cmd) {
	case TIOCMBIS:
		if (arg & TIOCM_RTS)
			mcr |= UART_MCR_RTS;
		if (arg & TIOCM_DTR)
			mcr |= UART_MCR_RTS;
		if (arg & TIOCM_LOOP)
			mcr |= UART_MCR_LOOP;
		break;

	case TIOCMBIC:
		if (arg & TIOCM_RTS)
			mcr &= ~UART_MCR_RTS;
		if (arg & TIOCM_DTR)
			mcr &= ~UART_MCR_RTS;
		if (arg & TIOCM_LOOP)
			mcr &= ~UART_MCR_LOOP;
		break;

	case TIOCMSET:
		/* turn off the RTS and DTR and LOOPBACK
		 * and then only turn on what was asked to */
		mcr &=  ~(UART_MCR_RTS | UART_MCR_DTR | UART_MCR_LOOP);
		mcr |= ((arg & TIOCM_RTS) ? UART_MCR_RTS : 0);
		mcr |= ((arg & TIOCM_DTR) ? UART_MCR_DTR : 0);
		mcr |= ((arg & TIOCM_LOOP) ? UART_MCR_LOOP : 0);
		break;
	}

	mos7720_port->shadowMCR = mcr;

	data = mos7720_port->shadowMCR;
	send_mos_cmd(port->serial, MOS_WRITE,
		     port->number - port->serial->minor, UART_MCR, &data);

	return 0;
}

static int get_modem_info(struct moschip_port *mos7720_port,
			  unsigned int __user *value)
{
	unsigned int result = 0;
	unsigned int msr = mos7720_port->shadowMSR;
	unsigned int mcr = mos7720_port->shadowMCR;

	result = ((mcr & UART_MCR_DTR)	? TIOCM_DTR: 0)	  /* 0x002 */
		  | ((mcr & UART_MCR_RTS)	? TIOCM_RTS: 0)   /* 0x004 */
		  | ((msr & UART_MSR_CTS)	? TIOCM_CTS: 0)   /* 0x020 */
		  | ((msr & UART_MSR_DCD)	? TIOCM_CAR: 0)   /* 0x040 */
		  | ((msr & UART_MSR_RI)	? TIOCM_RI:  0)   /* 0x080 */
		  | ((msr & UART_MSR_DSR)	? TIOCM_DSR: 0);  /* 0x100 */


	dbg("%s -- %x", __FUNCTION__, result);

	if (copy_to_user(value, &result, sizeof(int)))
		return -EFAULT;
	return 0;
}

static int get_serial_info(struct moschip_port *mos7720_port,
			   struct serial_struct __user *retinfo)
{
	struct serial_struct tmp;

	if (!retinfo)
		return -EFAULT;

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

	tmp.type		= PORT_16550A;
	tmp.line		= mos7720_port->port->serial->minor;
	tmp.port		= mos7720_port->port->number;
	tmp.irq			= 0;
	tmp.flags		= ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ;
        tmp.xmit_fifo_size	= NUM_URBS * URB_TRANSFER_BUFFER_SIZE;
	tmp.baud_base		= 9600;
	tmp.close_delay		= 5*HZ;
	tmp.closing_wait	= 30*HZ;

	if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
		return -EFAULT;
	return 0;
}

static int mos7720_ioctl(struct usb_serial_port *port, struct file *file,
			 unsigned int cmd, unsigned long arg)
{
	struct moschip_port *mos7720_port;
	struct async_icount cnow;
	struct async_icount cprev;
	struct serial_icounter_struct icount;

	mos7720_port = usb_get_serial_port_data(port);
	if (mos7720_port == NULL)
		return -ENODEV;

	dbg("%s - port %d, cmd = 0x%x", __FUNCTION__, port->number, cmd);

	switch (cmd) {
	case TIOCINQ:
		/* return number of bytes available */
		dbg("%s (%d) TIOCINQ", __FUNCTION__,  port->number);
		return get_number_bytes_avail(mos7720_port,
					      (unsigned int __user *)arg);
		break;

	case TIOCSERGETLSR:
		dbg("%s (%d) TIOCSERGETLSR", __FUNCTION__,  port->number);
		return get_lsr_info(mos7720_port, (unsigned int __user *)arg);
		return 0;

	case TIOCMBIS:
	case TIOCMBIC:
	case TIOCMSET:
		dbg("%s (%d) TIOCMSET/TIOCMBIC/TIOCMSET", __FUNCTION__,
		    port->number);
		return set_modem_info(mos7720_port, cmd,
				      (unsigned int __user *)arg);

	case TIOCMGET:
		dbg("%s (%d) TIOCMGET", __FUNCTION__,  port->number);
		return get_modem_info(mos7720_port,
				      (unsigned int __user *)arg);

	case TIOCGSERIAL:
		dbg("%s (%d) TIOCGSERIAL", __FUNCTION__,  port->number);
		return get_serial_info(mos7720_port,
				       (struct serial_struct __user *)arg);

	case TIOCSSERIAL:
		dbg("%s (%d) TIOCSSERIAL", __FUNCTION__,  port->number);
		break;

	case TIOCMIWAIT:
		dbg("%s (%d) TIOCMIWAIT", __FUNCTION__,  port->number);
		cprev = mos7720_port->icount;
		while (1) {
			if (signal_pending(current))
				return -ERESTARTSYS;
			cnow = mos7720_port->icount;
			if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
			    cnow.dcd == cprev.dcd && cnow.cts == cprev.cts)
				return -EIO; /* no change => error */
			if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
			    ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
			    ((arg & TIOCM_CD)  && (cnow.dcd != cprev.dcd)) ||
			    ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts)) ) {
				return 0;
			}
			cprev = cnow;
		}
		/* NOTREACHED */
		break;

	case TIOCGICOUNT:
		cnow = mos7720_port->icount;
		icount.cts = cnow.cts;
		icount.dsr = cnow.dsr;
		icount.rng = cnow.rng;
		icount.dcd = cnow.dcd;
		icount.rx = cnow.rx;
		icount.tx = cnow.tx;
		icount.frame = cnow.frame;
		icount.overrun = cnow.overrun;
		icount.parity = cnow.parity;
		icount.brk = cnow.brk;
		icount.buf_overrun = cnow.buf_overrun;

		dbg("%s (%d) TIOCGICOUNT RX=%d, TX=%d", __FUNCTION__,
		    port->number, icount.rx, icount.tx );
		if (copy_to_user((void __user *)arg, &icount, sizeof(icount)))
			return -EFAULT;
		return 0;
	}

	return -ENOIOCTLCMD;
}

static int mos7720_startup(struct usb_serial *serial)
{
	struct moschip_serial *mos7720_serial;
	struct moschip_port *mos7720_port;
	struct usb_device *dev;
	int i;
	char data;

	dbg("%s: Entering ..........", __FUNCTION__);

	if (!serial) {
		dbg("Invalid Handler");
		return -ENODEV;
	}

	dev = serial->dev;

	/* create our private serial structure */
	mos7720_serial = kzalloc(sizeof(struct moschip_serial), GFP_KERNEL);
	if (mos7720_serial == NULL) {
		err("%s - Out of memory", __FUNCTION__);
		return -ENOMEM;
	}

	usb_set_serial_data(serial, mos7720_serial);

	/* we set up the pointers to the endpoints in the mos7720_open *
	 * function, as the structures aren't created yet.             */

	/* set up port private structures */
	for (i = 0; i < serial->num_ports; ++i) {
		mos7720_port = kzalloc(sizeof(struct moschip_port), GFP_KERNEL);
		if (mos7720_port == NULL) {
			err("%s - Out of memory", __FUNCTION__);
			usb_set_serial_data(serial, NULL);
			kfree(mos7720_serial);
			return -ENOMEM;
		}

		/* Initialize all port interrupt end point to port 0 int
		 * endpoint.  Our device has only one interrupt endpoint
		 * comman to all ports */
		serial->port[i]->interrupt_in_endpointAddress = serial->port[0]->interrupt_in_endpointAddress;

		mos7720_port->port = serial->port[i];
		usb_set_serial_port_data(serial->port[i], mos7720_port);

		dbg("port number is %d", serial->port[i]->number);
		dbg("serial number is %d", serial->minor);
	}


	/* setting configuration feature to one */
	usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
			(__u8)0x03, 0x00,0x01,0x00, NULL, 0x00, 5*HZ);

	send_mos_cmd(serial,MOS_READ,0x00, UART_LSR, &data);  // LSR For Port 1
	dbg("LSR:%x",data);

	send_mos_cmd(serial,MOS_READ,0x01, UART_LSR, &data);  // LSR For Port 2
	dbg("LSR:%x",data);

	return 0;
}

static void mos7720_shutdown(struct usb_serial *serial)
{
	int i;

	/* free private structure allocated for serial port */
	for (i=0; i < serial->num_ports; ++i) {
		kfree(usb_get_serial_port_data(serial->port[i]));
		usb_set_serial_port_data(serial->port[i], NULL);
	}

	/* free private structure allocated for serial device */
	kfree(usb_get_serial_data(serial));
	usb_set_serial_data(serial, NULL);
}

static struct usb_driver usb_driver = {
	.name =		"moschip7720",
	.probe =	usb_serial_probe,
	.disconnect =	usb_serial_disconnect,
	.id_table =	moschip_port_id_table,
	.no_dynamic_id =	1,
};

static struct usb_serial_driver moschip7720_2port_driver = {
	.driver = {
		.owner =	THIS_MODULE,
		.name =		"moschip7720",
	},
	.description		= "Moschip 2 port adapter",
	.usb_driver		= &usb_driver,
	.id_table		= moschip_port_id_table,
	.num_interrupt_in	= 1,
	.num_bulk_in		= 2,
	.num_bulk_out		= 2,
	.num_ports		= 2,
	.open			= mos7720_open,
	.close			= mos7720_close,
	.throttle		= mos7720_throttle,
	.unthrottle		= mos7720_unthrottle,
	.attach			= mos7720_startup,
	.shutdown		= mos7720_shutdown,
	.ioctl			= mos7720_ioctl,
	.set_termios		= mos7720_set_termios,
	.write			= mos7720_write,
	.write_room		= mos7720_write_room,
	.chars_in_buffer	= mos7720_chars_in_buffer,
	.break_ctl		= mos7720_break,
	.read_bulk_callback	= mos7720_bulk_in_callback,
	.read_int_callback	= mos7720_interrupt_callback,
};

static int __init moschip7720_init(void)
{
	int retval;

	dbg("%s: Entering ..........", __FUNCTION__);

	/* Register with the usb serial */
	retval = usb_serial_register(&moschip7720_2port_driver);
	if (retval)
		goto failed_port_device_register;

	info(DRIVER_DESC " " DRIVER_VERSION);

	/* Register with the usb */
	retval = usb_register(&usb_driver);
	if (retval)
		goto failed_usb_register;

	return 0;

failed_usb_register:
	usb_serial_deregister(&moschip7720_2port_driver);

failed_port_device_register:
	return retval;
}

static void __exit moschip7720_exit(void)
{
	usb_deregister(&usb_driver);
	usb_serial_deregister(&moschip7720_2port_driver);
}

module_init(moschip7720_init);
module_exit(moschip7720_exit);

/* Module information */
MODULE_AUTHOR( DRIVER_AUTHOR );
MODULE_DESCRIPTION( DRIVER_DESC );
MODULE_LICENSE("GPL");

module_param(debug, bool, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(debug, "Debug enabled or not");