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linux/drivers/usb/serial/mct_u232.h
Dave Platt 45b844df5a USB: RTS/CTS handshaking support, DTR fixes for MCT U232 serial adapter 
Improvements and fixes to the MCT U232 USB/serial interface driver.
Implement RTS/CTS hardware flow control.  Implement HUPCL.  Bring
handling of DTR and RTS into conformance with other Linux serial
port drivers - assert both signals when opening device, even if
"crtscts" is not currently selected.

Signed-off-by: Dave Platt <dplatt@radagast.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2007-07-12 16:29:48 -07:00

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/*
* 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 appears to control whether CTS is required
during transmission.
Sending a zero byte allows data transmission to a device which is not
asserting CTS. Sending a '1' byte will cause transmission to be deferred
until the device asserts CTS.
*/
#define MCT_U232_SET_CTS_REQUEST 12
#define MCT_U232_SET_CTS_SIZE 1
/*
* Baud rate (divisor)
* Actually, there are two of them, MCT website calls them "Philips solution"
* and "Intel solution". They are the regular MCT and "Sitecom" for us.
* This is pointless to document in the header, see the code for the bits.
*/
static int mct_u232_calculate_baud_rate(struct usb_serial *serial, int value);
/*
* 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 Philips 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 */
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