text: /*
   * Definitions for MCT (Magic Control Technology) USB-RS232 Converter Driver
   *
   *   Copyright (C) 2000 Wolfgang Grandegger (wolfgang@ces.ch)
   *
   *   This program is free software; you can redistribute it and/or modify
   *   it under the terms of the GNU General Public License as published by
   *   the Free Software Foundation; either version 2 of the License, or
   *   (at your option) any later version.
   *
   * This driver is for the device MCT USB-RS232 Converter (25 pin, Model No.
   * U232-P25) from Magic Control Technology Corp. (there is also a 9 pin
   * Model No. U232-P9). See http://www.mct.com.tw/p_u232.html for further
   * information. The properties of this device are listed at the end of this
   * file. This device is available from various distributors. I know Hana,
   * http://www.hana.de and D-Link, http://www.dlink.com/products/usb/dsbs25.
   *
   * All of the information about the device was acquired by using SniffUSB
   * on Windows98. The technical details of the reverse engineering are
   * summarized at the end of this file.
   */
  
  #ifndef __LINUX_USB_SERIAL_MCT_U232_H
  #define __LINUX_USB_SERIAL_MCT_U232_H
  
  #define MCT_U232_VID	                0x0711	/* Vendor Id */
  #define MCT_U232_PID	                0x0210	/* Original MCT Product Id */
  
  /* U232-P25, Sitecom */
  #define MCT_U232_SITECOM_PID		0x0230	/* Sitecom Product Id */
  
  /* DU-H3SP USB BAY hub */
  #define MCT_U232_DU_H3SP_PID		0x0200	/* D-Link DU-H3SP USB BAY */
  
  /* Belkin badge the MCT U232-P9 as the F5U109 */
  #define MCT_U232_BELKIN_F5U109_VID	0x050d	/* Vendor Id */
  #define MCT_U232_BELKIN_F5U109_PID	0x0109	/* Product Id */
  
  /*
   * Vendor Request Interface
   */
  #define MCT_U232_SET_REQUEST_TYPE	0x40
  #define MCT_U232_GET_REQUEST_TYPE	0xc0
  
  #define MCT_U232_GET_MODEM_STAT_REQUEST 2  /* Get Modem Status Register (MSR) */
  #define MCT_U232_GET_MODEM_STAT_SIZE    1
  
  #define MCT_U232_GET_LINE_CTRL_REQUEST  6  /* Get Line Control Register (LCR) */
  #define MCT_U232_GET_LINE_CTRL_SIZE     1  /* ... not used by this driver */
  
  #define MCT_U232_SET_BAUD_RATE_REQUEST	5  /* Set Baud Rate Divisor */
  #define MCT_U232_SET_BAUD_RATE_SIZE     4
  
  #define MCT_U232_SET_LINE_CTRL_REQUEST	7  /* Set Line Control Register (LCR) */
  #define MCT_U232_SET_LINE_CTRL_SIZE     1
  
  #define MCT_U232_SET_MODEM_CTRL_REQUEST	10 /* Set Modem Control Register (MCR) */
  #define MCT_U232_SET_MODEM_CTRL_SIZE    1
  
  /* This USB device request code is not well understood.  It is transmitted by
     the MCT-supplied Windows driver whenever the baud rate changes. 
  */
  #define MCT_U232_SET_UNKNOWN1_REQUEST   11  /* Unknown functionality */
  #define MCT_U232_SET_UNKNOWN1_SIZE       1
  
  /* This USB device request code is not well understood.  It is transmitted by
     the MCT-supplied Windows driver whenever the baud rate changes. 
     
     Without this USB device request, the USB/RS-232 adapter will not write to
     RS-232 devices which do not assert the 'CTS' signal.
  */
  #define MCT_U232_SET_UNKNOWN2_REQUEST   12  /* Unknown functionality */
  #define MCT_U232_SET_UNKNOWN2_SIZE       1
  
  /*
   * Baud rate (divisor)
   */
  #define MCT_U232_BAUD_RATE(b)		(115200/b)
  
  /*
   * Line Control Register (LCR)
   */
  #define MCT_U232_SET_BREAK              0x40
  
  #define MCT_U232_PARITY_SPACE		0x38
  #define MCT_U232_PARITY_MARK		0x28
  #define MCT_U232_PARITY_EVEN		0x18
  #define MCT_U232_PARITY_ODD		0x08
  #define MCT_U232_PARITY_NONE		0x00
  
  #define MCT_U232_DATA_BITS_5            0x00
  #define MCT_U232_DATA_BITS_6            0x01
  #define MCT_U232_DATA_BITS_7            0x02
  #define MCT_U232_DATA_BITS_8            0x03
  
  #define MCT_U232_STOP_BITS_2            0x04
  #define MCT_U232_STOP_BITS_1            0x00
  
  /*
   * Modem Control Register (MCR)
   */
  #define MCT_U232_MCR_NONE               0x8     /* Deactivate DTR and RTS */
  #define MCT_U232_MCR_RTS                0xa     /* Activate RTS */
  #define MCT_U232_MCR_DTR                0x9     /* Activate DTR */
  
  /*
   * Modem Status Register (MSR)
   */
  #define MCT_U232_MSR_INDEX              0x0     /* data[index] */
  #define MCT_U232_MSR_CD                 0x80    /* Current CD */
  #define MCT_U232_MSR_RI                 0x40    /* Current RI */
  #define MCT_U232_MSR_DSR                0x20    /* Current DSR */
  #define MCT_U232_MSR_CTS                0x10    /* Current CTS */
  #define MCT_U232_MSR_DCD                0x08    /* Delta CD */
  #define MCT_U232_MSR_DRI                0x04    /* Delta RI */
  #define MCT_U232_MSR_DDSR               0x02    /* Delta DSR */
  #define MCT_U232_MSR_DCTS               0x01    /* Delta CTS */
  
  /*
   * Line Status Register (LSR)
   */
  #define MCT_U232_LSR_INDEX              1       /* data[index] */
  #define MCT_U232_LSR_ERR                0x80    /* OE | PE | FE | BI */
  #define MCT_U232_LSR_TEMT               0x40    /* transmit register empty */
  #define MCT_U232_LSR_THRE               0x20    /* transmit holding register empty */
  #define MCT_U232_LSR_BI                 0x10    /* break indicator */
  #define MCT_U232_LSR_FE                 0x08    /* framing error */
  #define MCT_U232_LSR_OE                 0x02    /* overrun error */
  #define MCT_U232_LSR_PE                 0x04    /* parity error */
  #define MCT_U232_LSR_OE                 0x02    /* overrun error */
  #define MCT_U232_LSR_DR                 0x01    /* receive data ready */
  
  
  /* -----------------------------------------------------------------------------
   * Technical Specification reverse engineered with SniffUSB on Windows98
   * =====================================================================
   *
   *  The technical details of the device have been acquired be using "SniffUSB"
   *  and the vendor-supplied device driver (version 2.3A) under Windows98. To
   *  identify the USB vendor-specific requests and to assign them to terminal 
   *  settings (flow control, baud rate, etc.) the program "SerialSettings" from
   *  William G. Greathouse has been proven to be very useful. I also used the
   *  Win98 "HyperTerminal" and "usb-robot" on Linux for testing. The results and 
   *  observations are summarized below:
   *
   *  The USB requests seem to be directly mapped to the registers of a 8250,
   *  16450 or 16550 UART. The FreeBSD handbook (appendix F.4 "Input/Output
   *  devices") contains a comprehensive description of UARTs and its registers.
   *  The bit descriptions are actually taken from there.
   *
   *
   * Baud rate (divisor)
   * -------------------
   *
   *   BmRequestType:  0x40 (0100 0000B)
   *   bRequest:       0x05
   *   wValue:         0x0000
   *   wIndex:         0x0000
   *   wLength:        0x0004
   *   Data:           divisor = 115200 / baud_rate
   *
   *   SniffUSB observations (Nov 2003): Contrary to the 'wLength' value of 4
   *   shown above, observations with a Belkin F5U109 adapter, using the
   *   MCT-supplied Windows98 driver (U2SPORT.VXD, "File version: 1.21P.0104 for
   *   Win98/Me"), show this request has a length of 1 byte, presumably because
   *   of the fact that the Belkin adapter and the 'Sitecom U232-P25' adapter
   *   use a baud-rate code instead of a conventional RS-232 baud rate divisor.
   *   The current source code for this driver does not reflect this fact, but
   *   the driver works fine with this adapter/driver combination nonetheless.
   *
   *
   * Line Control Register (LCR)
   * ---------------------------
   *
   *  BmRequestType:  0x40 (0100 0000B)    0xc0 (1100 0000B)
   *  bRequest:       0x07                 0x06
   *  wValue:         0x0000
   *  wIndex:         0x0000
   *  wLength:        0x0001
   *  Data:           LCR (see below)
   *
   *  Bit 7: Divisor Latch Access Bit (DLAB). When set, access to the data
   *  	   transmit/receive register (THR/RBR) and the Interrupt Enable Register
   *  	   (IER) is disabled. Any access to these ports is now redirected to the
   *  	   Divisor Latch Registers. Setting this bit, loading the Divisor
   *  	   Registers, and clearing DLAB should be done with interrupts disabled.
   *  Bit 6: Set Break. When set to "1", the transmitter begins to transmit
   *  	   continuous Spacing until this bit is set to "0". This overrides any
   *  	   bits of characters that are being transmitted.
   *  Bit 5: Stick Parity. When parity is enabled, setting this bit causes parity
   *  	   to always be "1" or "0", based on the value of Bit 4.
   *  Bit 4: Even Parity Select (EPS). When parity is enabled and Bit 5 is "0",
   *  	   setting this bit causes even parity to be transmitted and expected.
   *  	   Otherwise, odd parity is used.
   *  Bit 3: Parity Enable (PEN). When set to "1", a parity bit is inserted
   *  	   between the last bit of the data and the Stop Bit. The UART will also
   *  	   expect parity to be present in the received data.
   *  Bit 2: Number of Stop Bits (STB). If set to "1" and using 5-bit data words,
   *  	   1.5 Stop Bits are transmitted and expected in each data word. For
   *  	   6, 7 and 8-bit data words, 2 Stop Bits are transmitted and expected.
   *  	   When this bit is set to "0", one Stop Bit is used on each data word.
   *  Bit 1: Word Length Select Bit #1 (WLSB1)
   *  Bit 0: Word Length Select Bit #0 (WLSB0)
   *  	   Together these bits specify the number of bits in each data word.
   *  	     1 0  Word Length
   *  	     0 0  5 Data Bits
   *  	     0 1  6 Data Bits
   *  	     1 0  7 Data Bits
   *  	     1 1  8 Data Bits
   *
   *  SniffUSB observations: Bit 7 seems not to be used. There seem to be two bugs
   *  in the Win98 driver: the break does not work (bit 6 is not asserted) and the
   *  stick parity bit is not cleared when set once. The LCR can also be read
   *  back with USB request 6 but this has never been observed with SniffUSB.
   *
   *
   * Modem Control Register (MCR)
   * ----------------------------
   *
   *  BmRequestType:  0x40  (0100 0000B)
   *  bRequest:       0x0a
   *  wValue:         0x0000
   *  wIndex:         0x0000
   *  wLength:        0x0001
   *  Data:           MCR (Bit 4..7, see below)
   *
   *  Bit 7: Reserved, always 0.
   *  Bit 6: Reserved, always 0.
   *  Bit 5: Reserved, always 0.
   *  Bit 4: Loop-Back Enable. When set to "1", the UART transmitter and receiver
   *  	   are internally connected together to allow diagnostic operations. In
   *  	   addition, the UART modem control outputs are connected to the UART
   *  	   modem control inputs. CTS is connected to RTS, DTR is connected to
   *  	   DSR, OUT1 is connected to RI, and OUT 2 is connected to DCD.
   *  Bit 3: OUT 2. An auxiliary output that the host processor may set high or
   *  	   low. In the IBM PC serial adapter (and most clones), OUT 2 is used
   *  	   to tri-state (disable) the interrupt signal from the
   *  	   8250/16450/16550 UART.
   *  Bit 2: OUT 1. An auxiliary output that the host processor may set high or
   *  	   low. This output is not used on the IBM PC serial adapter.
   *  Bit 1: Request to Send (RTS). When set to "1", the output of the UART -RTS
   *  	   line is Low (Active).
   *  Bit 0: Data Terminal Ready (DTR). When set to "1", the output of the UART
   *  	   -DTR line is Low (Active).
   *
   *  SniffUSB observations: Bit 2 and 4 seem not to be used but bit 3 has been
   *  seen _always_ set.
   *
   *
   * Modem Status Register (MSR)
   * ---------------------------
   *
   *  BmRequestType:  0xc0  (1100 0000B)
   *  bRequest:       0x02
   *  wValue:         0x0000
   *  wIndex:         0x0000
   *  wLength:        0x0001
   *  Data:           MSR (see below)
   *
   *  Bit 7: Data Carrier Detect (CD). Reflects the state of the DCD line on the
   *  	   UART.
   *  Bit 6: Ring Indicator (RI). Reflects the state of the RI line on the UART.
   *  Bit 5: Data Set Ready (DSR). Reflects the state of the DSR line on the UART.
   *  Bit 4: Clear To Send (CTS). Reflects the state of the CTS line on the UART.
   *  Bit 3: Delta Data Carrier Detect (DDCD). Set to "1" if the -DCD line has
   *  	   changed state one more more times since the last time the MSR was
   *  	   read by the host.
   *  Bit 2: Trailing Edge Ring Indicator (TERI). Set to "1" if the -RI line has
   *  	   had a low to high transition since the last time the MSR was read by
   *  	   the host.
   *  Bit 1: Delta Data Set Ready (DDSR). Set to "1" if the -DSR line has changed
   *  	   state one more more times since the last time the MSR was read by the
   *  	   host.
   *  Bit 0: Delta Clear To Send (DCTS). Set to "1" if the -CTS line has changed
   *  	   state one more times since the last time the MSR was read by the
   *  	   host.
   *
   *  SniffUSB observations: the MSR is also returned as first byte on the
   *  interrupt-in endpoint 0x83 to signal changes of modem status lines. The USB
   *  request to read MSR cannot be applied during normal device operation.
   *
   *
   * Line Status Register (LSR)
   * --------------------------
   *
   *  Bit 7   Error in Receiver FIFO. On the 8250/16450 UART, this bit is zero.
   *  	    This bit is set to "1" when any of the bytes in the FIFO have one or
   *  	    more of the following error conditions: PE, FE, or BI.
   *  Bit 6   Transmitter Empty (TEMT). When set to "1", there are no words
   *  	    remaining in the transmit FIFO or the transmit shift register. The
   *  	    transmitter is completely idle.
   *  Bit 5   Transmitter Holding Register Empty (THRE). When set to "1", the FIFO
   *  	    (or holding register) now has room for at least one additional word
   *  	    to transmit. The transmitter may still be transmitting when this bit
   *  	    is set to "1".
   *  Bit 4   Break Interrupt (BI). The receiver has detected a Break signal.
   *  Bit 3   Framing Error (FE). A Start Bit was detected but the Stop Bit did not
   *  	    appear at the expected time. The received word is probably garbled.
   *  Bit 2   Parity Error (PE). The parity bit was incorrect for the word received.
   *  Bit 1   Overrun Error (OE). A new word was received and there was no room in
   *  	    the receive buffer. The newly-arrived word in the shift register is
   *  	    discarded. On 8250/16450 UARTs, the word in the holding register is
   *  	    discarded and the newly- arrived word is put in the holding register.
   *  Bit 0   Data Ready (DR). One or more words are in the receive FIFO that the
   *  	    host may read. A word must be completely received and moved from the
   *  	    shift register into the FIFO (or holding register for 8250/16450
   *  	    designs) before this bit is set.
   *
   *  SniffUSB observations: the LSR is returned as second byte on the interrupt-in
   *  endpoint 0x83 to signal error conditions. Such errors have been seen with
   *  minicom/zmodem transfers (CRC errors).
   *
   *
   * Unknown #1
   * -------------------
   *
   *   BmRequestType:  0x40 (0100 0000B)
   *   bRequest:       0x0b
   *   wValue:         0x0000
   *   wIndex:         0x0000
   *   wLength:        0x0001
   *   Data:           0x00
   *
   *   SniffUSB observations (Nov 2003): With the MCT-supplied Windows98 driver
   *   (U2SPORT.VXD, "File version: 1.21P.0104 for Win98/Me"), this request
   *   occurs immediately after a "Baud rate (divisor)" message.  It was not
   *   observed at any other time.  It is unclear what purpose this message
   *   serves.
   *
   *
   * Unknown #2
   * -------------------
   *
   *   BmRequestType:  0x40 (0100 0000B)
   *   bRequest:       0x0c
   *   wValue:         0x0000
   *   wIndex:         0x0000
   *   wLength:        0x0001
   *   Data:           0x00
   *
   *   SniffUSB observations (Nov 2003): With the MCT-supplied Windows98 driver
   *   (U2SPORT.VXD, "File version: 1.21P.0104 for Win98/Me"), this request
   *   occurs immediately after the 'Unknown #1' message (see above).  It was
   *   not observed at any other time.  It is unclear what other purpose (if
   *   any) this message might serve, but without it, the USB/RS-232 adapter
   *   will not write to RS-232 devices which do not assert the 'CTS' signal.
   *
   *
   * Flow control
   * ------------
   *
   *  SniffUSB observations: no flow control specific requests have been realized
   *  apart from DTR/RTS settings. Both signals are dropped for no flow control
   *  but asserted for hardware or software flow control.
   *
   *
   * Endpoint usage
   * --------------
   *
   *  SniffUSB observations: the bulk-out endpoint 0x1 and interrupt-in endpoint
   *  0x81 is used to transmit and receive characters. The second interrupt-in 
   *  endpoint 0x83 signals exceptional conditions like modem line changes and 
   *  errors. The first byte returned is the MSR and the second byte the LSR.
   *
   *
   * Other observations
   * ------------------
   *
   *  Queued bulk transfers like used in visor.c did not work. 
   *  
   *
   * Properties of the USB device used (as found in /var/log/messages)
   * -----------------------------------------------------------------
   *
   *  Manufacturer: MCT Corporation.
   *  Product: USB-232 Interfact Controller
   *  SerialNumber: U2S22050
   *
   *    Length              = 18
   *    DescriptorType      = 01
   *    USB version         = 1.00
   *    Vendor:Product      = 0711:0210
   *    MaxPacketSize0      = 8
   *    NumConfigurations   = 1
   *    Device version      = 1.02
   *    Device Class:SubClass:Protocol = 00:00:00
   *      Per-interface classes
   *  Configuration:
   *    bLength             =    9
   *    bDescriptorType     =   02
   *    wTotalLength        = 0027
   *    bNumInterfaces      =   01
   *    bConfigurationValue =   01
   *    iConfiguration      =   00
   *    bmAttributes        =   c0
   *    MaxPower            =  100mA
   *
   *    Interface: 0
   *    Alternate Setting:  0
   *      bLength             =    9
   *      bDescriptorType     =   04
   *      bInterfaceNumber    =   00
   *      bAlternateSetting   =   00
   *      bNumEndpoints       =   03
   *      bInterface Class:SubClass:Protocol =   00:00:00
   *      iInterface          =   00
   *      Endpoint:
   * 	  bLength             =    7
   * 	  bDescriptorType     =   05
   * 	  bEndpointAddress    =   81 (in)
   * 	  bmAttributes        =   03 (Interrupt)
   * 	  wMaxPacketSize      = 0040
   * 	  bInterval           =   02
   *      Endpoint:
   * 	  bLength             =    7
   * 	  bDescriptorType     =   05
   * 	  bEndpointAddress    =   01 (out)
   * 	  bmAttributes        =   02 (Bulk)
   * 	  wMaxPacketSize      = 0040
   * 	  bInterval           =   00
   *      Endpoint:
   * 	  bLength             =    7
   * 	  bDescriptorType     =   05
   * 	  bEndpointAddress    =   83 (in)
   * 	  bmAttributes        =   03 (Interrupt)
   * 	  wMaxPacketSize      = 0002
   * 	  bInterval           =   02
   *
   *
   * Hardware details (added by Martin Hamilton, 2001/12/06)
   * -----------------------------------------------------------------
   *
   * This info was gleaned from opening a Belkin F5U109 DB9 USB serial
   * adaptor, which turns out to simply be a re-badged U232-P9.  We
   * know this because there is a sticky label on the circuit board
   * which says "U232-P9" ;-)
   * 
   * The circuit board inside the adaptor contains a Philips PDIUSBD12
   * USB endpoint chip and a Phillips P87C52UBAA microcontroller with
   * embedded UART.  Exhaustive documentation for these is available at:
   *
   *   http://www.semiconductors.philips.com/pip/p87c52ubaa
   *   http://www.semiconductors.philips.com/pip/pdiusbd12
   *
   * Thanks to Julian Highfield for the pointer to the Philips database.
   * 
   */
  
  #endif /* __LINUX_USB_SERIAL_MCT_U232_H */
  
  