2 * Definitions for MCT (Magic Control Technology) USB-RS232 Converter Driver
4 * Copyright (C) 2000 Wolfgang Grandegger (wolfgang@ces.ch)
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
11 * This driver is for the device MCT USB-RS232 Converter (25 pin, Model No.
12 * U232-P25) from Magic Control Technology Corp. (there is also a 9 pin
13 * Model No. U232-P9). See http://www.mct.com.tw/p_u232.html for further
14 * information. The properties of this device are listed at the end of this
15 * file. This device is available from various distributors. I know Hana,
16 * http://www.hana.de and D-Link, http://www.dlink.com/products/usb/dsbs25.
18 * All of the information about the device was acquired by using SniffUSB
19 * on Windows98. The technical details of the reverse engineering are
20 * summarized at the end of this file.
23 #ifndef __LINUX_USB_SERIAL_MCT_U232_H
24 #define __LINUX_USB_SERIAL_MCT_U232_H
26 #define MCT_U232_VID 0x0711 /* Vendor Id */
27 #define MCT_U232_PID 0x0210 /* Original MCT Product Id */
29 /* U232-P25, Sitecom */
30 #define MCT_U232_SITECOM_PID 0x0230 /* Sitecom Product Id */
32 /* DU-H3SP USB BAY hub */
33 #define MCT_U232_DU_H3SP_PID 0x0200 /* D-Link DU-H3SP USB BAY */
35 /* Belkin badge the MCT U232-P9 as the F5U109 */
36 #define MCT_U232_BELKIN_F5U109_VID 0x050d /* Vendor Id */
37 #define MCT_U232_BELKIN_F5U109_PID 0x0109 /* Product Id */
40 * Vendor Request Interface
42 #define MCT_U232_SET_REQUEST_TYPE 0x40
43 #define MCT_U232_GET_REQUEST_TYPE 0xc0
45 #define MCT_U232_GET_MODEM_STAT_REQUEST 2 /* Get Modem Status Register (MSR) */
46 #define MCT_U232_GET_MODEM_STAT_SIZE 1
48 #define MCT_U232_GET_LINE_CTRL_REQUEST 6 /* Get Line Control Register (LCR) */
49 #define MCT_U232_GET_LINE_CTRL_SIZE 1 /* ... not used by this driver */
51 #define MCT_U232_SET_BAUD_RATE_REQUEST 5 /* Set Baud Rate Divisor */
52 #define MCT_U232_SET_BAUD_RATE_SIZE 4
54 #define MCT_U232_SET_LINE_CTRL_REQUEST 7 /* Set Line Control Register (LCR) */
55 #define MCT_U232_SET_LINE_CTRL_SIZE 1
57 #define MCT_U232_SET_MODEM_CTRL_REQUEST 10 /* Set Modem Control Register (MCR) */
58 #define MCT_U232_SET_MODEM_CTRL_SIZE 1
60 /* This USB device request code is not well understood. It is transmitted by
61 the MCT-supplied Windows driver whenever the baud rate changes.
63 #define MCT_U232_SET_UNKNOWN1_REQUEST 11 /* Unknown functionality */
64 #define MCT_U232_SET_UNKNOWN1_SIZE 1
66 /* This USB device request code appears to control whether CTS is required
69 Sending a zero byte allows data transmission to a device which is not
70 asserting CTS. Sending a '1' byte will cause transmission to be deferred
71 until the device asserts CTS.
73 #define MCT_U232_SET_CTS_REQUEST 12
74 #define MCT_U232_SET_CTS_SIZE 1
78 * Actually, there are two of them, MCT website calls them "Philips solution"
79 * and "Intel solution". They are the regular MCT and "Sitecom" for us.
80 * This is pointless to document in the header, see the code for the bits.
82 static int mct_u232_calculate_baud_rate(struct usb_serial *serial, speed_t value, speed_t *result);
85 * Line Control Register (LCR)
87 #define MCT_U232_SET_BREAK 0x40
89 #define MCT_U232_PARITY_SPACE 0x38
90 #define MCT_U232_PARITY_MARK 0x28
91 #define MCT_U232_PARITY_EVEN 0x18
92 #define MCT_U232_PARITY_ODD 0x08
93 #define MCT_U232_PARITY_NONE 0x00
95 #define MCT_U232_DATA_BITS_5 0x00
96 #define MCT_U232_DATA_BITS_6 0x01
97 #define MCT_U232_DATA_BITS_7 0x02
98 #define MCT_U232_DATA_BITS_8 0x03
100 #define MCT_U232_STOP_BITS_2 0x04
101 #define MCT_U232_STOP_BITS_1 0x00
104 * Modem Control Register (MCR)
106 #define MCT_U232_MCR_NONE 0x8 /* Deactivate DTR and RTS */
107 #define MCT_U232_MCR_RTS 0xa /* Activate RTS */
108 #define MCT_U232_MCR_DTR 0x9 /* Activate DTR */
111 * Modem Status Register (MSR)
113 #define MCT_U232_MSR_INDEX 0x0 /* data[index] */
114 #define MCT_U232_MSR_CD 0x80 /* Current CD */
115 #define MCT_U232_MSR_RI 0x40 /* Current RI */
116 #define MCT_U232_MSR_DSR 0x20 /* Current DSR */
117 #define MCT_U232_MSR_CTS 0x10 /* Current CTS */
118 #define MCT_U232_MSR_DCD 0x08 /* Delta CD */
119 #define MCT_U232_MSR_DRI 0x04 /* Delta RI */
120 #define MCT_U232_MSR_DDSR 0x02 /* Delta DSR */
121 #define MCT_U232_MSR_DCTS 0x01 /* Delta CTS */
124 * Line Status Register (LSR)
126 #define MCT_U232_LSR_INDEX 1 /* data[index] */
127 #define MCT_U232_LSR_ERR 0x80 /* OE | PE | FE | BI */
128 #define MCT_U232_LSR_TEMT 0x40 /* transmit register empty */
129 #define MCT_U232_LSR_THRE 0x20 /* transmit holding register empty */
130 #define MCT_U232_LSR_BI 0x10 /* break indicator */
131 #define MCT_U232_LSR_FE 0x08 /* framing error */
132 #define MCT_U232_LSR_OE 0x02 /* overrun error */
133 #define MCT_U232_LSR_PE 0x04 /* parity error */
134 #define MCT_U232_LSR_OE 0x02 /* overrun error */
135 #define MCT_U232_LSR_DR 0x01 /* receive data ready */
138 /* -----------------------------------------------------------------------------
139 * Technical Specification reverse engineered with SniffUSB on Windows98
140 * =====================================================================
142 * The technical details of the device have been acquired be using "SniffUSB"
143 * and the vendor-supplied device driver (version 2.3A) under Windows98. To
144 * identify the USB vendor-specific requests and to assign them to terminal
145 * settings (flow control, baud rate, etc.) the program "SerialSettings" from
146 * William G. Greathouse has been proven to be very useful. I also used the
147 * Win98 "HyperTerminal" and "usb-robot" on Linux for testing. The results and
148 * observations are summarized below:
150 * The USB requests seem to be directly mapped to the registers of a 8250,
151 * 16450 or 16550 UART. The FreeBSD handbook (appendix F.4 "Input/Output
152 * devices") contains a comprehensive description of UARTs and its registers.
153 * The bit descriptions are actually taken from there.
156 * Baud rate (divisor)
157 * -------------------
159 * BmRequestType: 0x40 (0100 0000B)
164 * Data: divisor = 115200 / baud_rate
166 * SniffUSB observations (Nov 2003): Contrary to the 'wLength' value of 4
167 * shown above, observations with a Belkin F5U109 adapter, using the
168 * MCT-supplied Windows98 driver (U2SPORT.VXD, "File version: 1.21P.0104 for
169 * Win98/Me"), show this request has a length of 1 byte, presumably because
170 * of the fact that the Belkin adapter and the 'Sitecom U232-P25' adapter
171 * use a baud-rate code instead of a conventional RS-232 baud rate divisor.
172 * The current source code for this driver does not reflect this fact, but
173 * the driver works fine with this adapter/driver combination nonetheless.
176 * Line Control Register (LCR)
177 * ---------------------------
179 * BmRequestType: 0x40 (0100 0000B) 0xc0 (1100 0000B)
180 * bRequest: 0x07 0x06
184 * Data: LCR (see below)
186 * Bit 7: Divisor Latch Access Bit (DLAB). When set, access to the data
187 * transmit/receive register (THR/RBR) and the Interrupt Enable Register
188 * (IER) is disabled. Any access to these ports is now redirected to the
189 * Divisor Latch Registers. Setting this bit, loading the Divisor
190 * Registers, and clearing DLAB should be done with interrupts disabled.
191 * Bit 6: Set Break. When set to "1", the transmitter begins to transmit
192 * continuous Spacing until this bit is set to "0". This overrides any
193 * bits of characters that are being transmitted.
194 * Bit 5: Stick Parity. When parity is enabled, setting this bit causes parity
195 * to always be "1" or "0", based on the value of Bit 4.
196 * Bit 4: Even Parity Select (EPS). When parity is enabled and Bit 5 is "0",
197 * setting this bit causes even parity to be transmitted and expected.
198 * Otherwise, odd parity is used.
199 * Bit 3: Parity Enable (PEN). When set to "1", a parity bit is inserted
200 * between the last bit of the data and the Stop Bit. The UART will also
201 * expect parity to be present in the received data.
202 * Bit 2: Number of Stop Bits (STB). If set to "1" and using 5-bit data words,
203 * 1.5 Stop Bits are transmitted and expected in each data word. For
204 * 6, 7 and 8-bit data words, 2 Stop Bits are transmitted and expected.
205 * When this bit is set to "0", one Stop Bit is used on each data word.
206 * Bit 1: Word Length Select Bit #1 (WLSB1)
207 * Bit 0: Word Length Select Bit #0 (WLSB0)
208 * Together these bits specify the number of bits in each data word.
215 * SniffUSB observations: Bit 7 seems not to be used. There seem to be two bugs
216 * in the Win98 driver: the break does not work (bit 6 is not asserted) and the
217 * stick parity bit is not cleared when set once. The LCR can also be read
218 * back with USB request 6 but this has never been observed with SniffUSB.
221 * Modem Control Register (MCR)
222 * ----------------------------
224 * BmRequestType: 0x40 (0100 0000B)
229 * Data: MCR (Bit 4..7, see below)
231 * Bit 7: Reserved, always 0.
232 * Bit 6: Reserved, always 0.
233 * Bit 5: Reserved, always 0.
234 * Bit 4: Loop-Back Enable. When set to "1", the UART transmitter and receiver
235 * are internally connected together to allow diagnostic operations. In
236 * addition, the UART modem control outputs are connected to the UART
237 * modem control inputs. CTS is connected to RTS, DTR is connected to
238 * DSR, OUT1 is connected to RI, and OUT 2 is connected to DCD.
239 * Bit 3: OUT 2. An auxiliary output that the host processor may set high or
240 * low. In the IBM PC serial adapter (and most clones), OUT 2 is used
241 * to tri-state (disable) the interrupt signal from the
242 * 8250/16450/16550 UART.
243 * Bit 2: OUT 1. An auxiliary output that the host processor may set high or
244 * low. This output is not used on the IBM PC serial adapter.
245 * Bit 1: Request to Send (RTS). When set to "1", the output of the UART -RTS
246 * line is Low (Active).
247 * Bit 0: Data Terminal Ready (DTR). When set to "1", the output of the UART
248 * -DTR line is Low (Active).
250 * SniffUSB observations: Bit 2 and 4 seem not to be used but bit 3 has been
254 * Modem Status Register (MSR)
255 * ---------------------------
257 * BmRequestType: 0xc0 (1100 0000B)
262 * Data: MSR (see below)
264 * Bit 7: Data Carrier Detect (CD). Reflects the state of the DCD line on the
266 * Bit 6: Ring Indicator (RI). Reflects the state of the RI line on the UART.
267 * Bit 5: Data Set Ready (DSR). Reflects the state of the DSR line on the UART.
268 * Bit 4: Clear To Send (CTS). Reflects the state of the CTS line on the UART.
269 * Bit 3: Delta Data Carrier Detect (DDCD). Set to "1" if the -DCD line has
270 * changed state one more more times since the last time the MSR was
272 * Bit 2: Trailing Edge Ring Indicator (TERI). Set to "1" if the -RI line has
273 * had a low to high transition since the last time the MSR was read by
275 * Bit 1: Delta Data Set Ready (DDSR). Set to "1" if the -DSR line has changed
276 * state one more more times since the last time the MSR was read by the
278 * Bit 0: Delta Clear To Send (DCTS). Set to "1" if the -CTS line has changed
279 * state one more times since the last time the MSR was read by the
282 * SniffUSB observations: the MSR is also returned as first byte on the
283 * interrupt-in endpoint 0x83 to signal changes of modem status lines. The USB
284 * request to read MSR cannot be applied during normal device operation.
287 * Line Status Register (LSR)
288 * --------------------------
290 * Bit 7 Error in Receiver FIFO. On the 8250/16450 UART, this bit is zero.
291 * This bit is set to "1" when any of the bytes in the FIFO have one or
292 * more of the following error conditions: PE, FE, or BI.
293 * Bit 6 Transmitter Empty (TEMT). When set to "1", there are no words
294 * remaining in the transmit FIFO or the transmit shift register. The
295 * transmitter is completely idle.
296 * Bit 5 Transmitter Holding Register Empty (THRE). When set to "1", the FIFO
297 * (or holding register) now has room for at least one additional word
298 * to transmit. The transmitter may still be transmitting when this bit
300 * Bit 4 Break Interrupt (BI). The receiver has detected a Break signal.
301 * Bit 3 Framing Error (FE). A Start Bit was detected but the Stop Bit did not
302 * appear at the expected time. The received word is probably garbled.
303 * Bit 2 Parity Error (PE). The parity bit was incorrect for the word received.
304 * Bit 1 Overrun Error (OE). A new word was received and there was no room in
305 * the receive buffer. The newly-arrived word in the shift register is
306 * discarded. On 8250/16450 UARTs, the word in the holding register is
307 * discarded and the newly- arrived word is put in the holding register.
308 * Bit 0 Data Ready (DR). One or more words are in the receive FIFO that the
309 * host may read. A word must be completely received and moved from the
310 * shift register into the FIFO (or holding register for 8250/16450
311 * designs) before this bit is set.
313 * SniffUSB observations: the LSR is returned as second byte on the interrupt-in
314 * endpoint 0x83 to signal error conditions. Such errors have been seen with
315 * minicom/zmodem transfers (CRC errors).
319 * -------------------
321 * BmRequestType: 0x40 (0100 0000B)
328 * SniffUSB observations (Nov 2003): With the MCT-supplied Windows98 driver
329 * (U2SPORT.VXD, "File version: 1.21P.0104 for Win98/Me"), this request
330 * occurs immediately after a "Baud rate (divisor)" message. It was not
331 * observed at any other time. It is unclear what purpose this message
336 * -------------------
338 * BmRequestType: 0x40 (0100 0000B)
345 * SniffUSB observations (Nov 2003): With the MCT-supplied Windows98 driver
346 * (U2SPORT.VXD, "File version: 1.21P.0104 for Win98/Me"), this request
347 * occurs immediately after the 'Unknown #1' message (see above). It was
348 * not observed at any other time. It is unclear what other purpose (if
349 * any) this message might serve, but without it, the USB/RS-232 adapter
350 * will not write to RS-232 devices which do not assert the 'CTS' signal.
356 * SniffUSB observations: no flow control specific requests have been realized
357 * apart from DTR/RTS settings. Both signals are dropped for no flow control
358 * but asserted for hardware or software flow control.
364 * SniffUSB observations: the bulk-out endpoint 0x1 and interrupt-in endpoint
365 * 0x81 is used to transmit and receive characters. The second interrupt-in
366 * endpoint 0x83 signals exceptional conditions like modem line changes and
367 * errors. The first byte returned is the MSR and the second byte the LSR.
373 * Queued bulk transfers like used in visor.c did not work.
376 * Properties of the USB device used (as found in /var/log/messages)
377 * -----------------------------------------------------------------
379 * Manufacturer: MCT Corporation.
380 * Product: USB-232 Interfact Controller
381 * SerialNumber: U2S22050
384 * DescriptorType = 01
386 * Vendor:Product = 0711:0210
388 * NumConfigurations = 1
389 * Device version = 1.02
390 * Device Class:SubClass:Protocol = 00:00:00
391 * Per-interface classes
394 * bDescriptorType = 02
395 * wTotalLength = 0027
396 * bNumInterfaces = 01
397 * bConfigurationValue = 01
398 * iConfiguration = 00
403 * Alternate Setting: 0
405 * bDescriptorType = 04
406 * bInterfaceNumber = 00
407 * bAlternateSetting = 00
409 * bInterface Class:SubClass:Protocol = 00:00:00
413 * bDescriptorType = 05
414 * bEndpointAddress = 81 (in)
415 * bmAttributes = 03 (Interrupt)
416 * wMaxPacketSize = 0040
420 * bDescriptorType = 05
421 * bEndpointAddress = 01 (out)
422 * bmAttributes = 02 (Bulk)
423 * wMaxPacketSize = 0040
427 * bDescriptorType = 05
428 * bEndpointAddress = 83 (in)
429 * bmAttributes = 03 (Interrupt)
430 * wMaxPacketSize = 0002
434 * Hardware details (added by Martin Hamilton, 2001/12/06)
435 * -----------------------------------------------------------------
437 * This info was gleaned from opening a Belkin F5U109 DB9 USB serial
438 * adaptor, which turns out to simply be a re-badged U232-P9. We
439 * know this because there is a sticky label on the circuit board
440 * which says "U232-P9" ;-)
442 * The circuit board inside the adaptor contains a Philips PDIUSBD12
443 * USB endpoint chip and a Philips P87C52UBAA microcontroller with
444 * embedded UART. Exhaustive documentation for these is available at:
446 * http://www.semiconductors.philips.com/pip/p87c52ubaa
447 * http://www.semiconductors.philips.com/pip/pdiusbd12
449 * Thanks to Julian Highfield for the pointer to the Philips database.
453 #endif /* __LINUX_USB_SERIAL_MCT_U232_H */