1 /* SPDX-License-Identifier: GPL-2.0+ */
3 * Definitions for MCT (Magic Control Technology) USB-RS232 Converter Driver
5 * Copyright (C) 2000 Wolfgang Grandegger (wolfgang@ces.ch)
7 * This driver is for the device MCT USB-RS232 Converter (25 pin, Model No.
8 * U232-P25) from Magic Control Technology Corp. (there is also a 9 pin
9 * Model No. U232-P9). See http://www.mct.com.tw/products/product_us232.html
10 * for further information. The properties of this device are listed at the end
11 * of this file. This device was used in the Dlink DSB-S25.
13 * All of the information about the device was acquired by using SniffUSB
14 * on Windows98. The technical details of the reverse engineering are
15 * summarized at the end of this file.
18 #ifndef __LINUX_USB_SERIAL_MCT_U232_H
19 #define __LINUX_USB_SERIAL_MCT_U232_H
21 #define MCT_U232_VID 0x0711 /* Vendor Id */
22 #define MCT_U232_PID 0x0210 /* Original MCT Product Id */
24 /* U232-P25, Sitecom */
25 #define MCT_U232_SITECOM_PID 0x0230 /* Sitecom Product Id */
27 /* DU-H3SP USB BAY hub */
28 #define MCT_U232_DU_H3SP_PID 0x0200 /* D-Link DU-H3SP USB BAY */
30 /* Belkin badge the MCT U232-P9 as the F5U109 */
31 #define MCT_U232_BELKIN_F5U109_VID 0x050d /* Vendor Id */
32 #define MCT_U232_BELKIN_F5U109_PID 0x0109 /* Product Id */
35 * Vendor Request Interface
37 #define MCT_U232_SET_REQUEST_TYPE 0x40
38 #define MCT_U232_GET_REQUEST_TYPE 0xc0
40 /* Get Modem Status Register (MSR) */
41 #define MCT_U232_GET_MODEM_STAT_REQUEST 2
42 #define MCT_U232_GET_MODEM_STAT_SIZE 1
44 /* Get Line Control Register (LCR) */
45 /* ... not used by this driver */
46 #define MCT_U232_GET_LINE_CTRL_REQUEST 6
47 #define MCT_U232_GET_LINE_CTRL_SIZE 1
49 /* Set Baud Rate Divisor */
50 #define MCT_U232_SET_BAUD_RATE_REQUEST 5
51 #define MCT_U232_SET_BAUD_RATE_SIZE 4
53 /* Set Line Control Register (LCR) */
54 #define MCT_U232_SET_LINE_CTRL_REQUEST 7
55 #define MCT_U232_SET_LINE_CTRL_SIZE 1
57 /* Set Modem Control Register (MCR) */
58 #define MCT_U232_SET_MODEM_CTRL_REQUEST 10
59 #define MCT_U232_SET_MODEM_CTRL_SIZE 1
62 * This USB device request code is not well understood. It is transmitted by
63 * the MCT-supplied Windows driver whenever the baud rate changes.
65 #define MCT_U232_SET_UNKNOWN1_REQUEST 11 /* Unknown functionality */
66 #define MCT_U232_SET_UNKNOWN1_SIZE 1
69 * This USB device request code appears to control whether CTS is required
70 * during transmission.
72 * Sending a zero byte allows data transmission to a device which is not
73 * asserting CTS. Sending a '1' byte will cause transmission to be deferred
74 * until the device asserts CTS.
76 #define MCT_U232_SET_CTS_REQUEST 12
77 #define MCT_U232_SET_CTS_SIZE 1
79 #define MCT_U232_MAX_SIZE 4 /* of MCT_XXX_SIZE */
83 * Actually, there are two of them, MCT website calls them "Philips solution"
84 * and "Intel solution". They are the regular MCT and "Sitecom" for us.
85 * This is pointless to document in the header, see the code for the bits.
87 static int mct_u232_calculate_baud_rate(struct usb_serial *serial,
88 speed_t value, speed_t *result);
91 * Line Control Register (LCR)
93 #define MCT_U232_SET_BREAK 0x40
95 #define MCT_U232_PARITY_SPACE 0x38
96 #define MCT_U232_PARITY_MARK 0x28
97 #define MCT_U232_PARITY_EVEN 0x18
98 #define MCT_U232_PARITY_ODD 0x08
99 #define MCT_U232_PARITY_NONE 0x00
101 #define MCT_U232_DATA_BITS_5 0x00
102 #define MCT_U232_DATA_BITS_6 0x01
103 #define MCT_U232_DATA_BITS_7 0x02
104 #define MCT_U232_DATA_BITS_8 0x03
106 #define MCT_U232_STOP_BITS_2 0x04
107 #define MCT_U232_STOP_BITS_1 0x00
110 * Modem Control Register (MCR)
112 #define MCT_U232_MCR_NONE 0x8 /* Deactivate DTR and RTS */
113 #define MCT_U232_MCR_RTS 0xa /* Activate RTS */
114 #define MCT_U232_MCR_DTR 0x9 /* Activate DTR */
117 * Modem Status Register (MSR)
119 #define MCT_U232_MSR_INDEX 0x0 /* data[index] */
120 #define MCT_U232_MSR_CD 0x80 /* Current CD */
121 #define MCT_U232_MSR_RI 0x40 /* Current RI */
122 #define MCT_U232_MSR_DSR 0x20 /* Current DSR */
123 #define MCT_U232_MSR_CTS 0x10 /* Current CTS */
124 #define MCT_U232_MSR_DCD 0x08 /* Delta CD */
125 #define MCT_U232_MSR_DRI 0x04 /* Delta RI */
126 #define MCT_U232_MSR_DDSR 0x02 /* Delta DSR */
127 #define MCT_U232_MSR_DCTS 0x01 /* Delta CTS */
130 * Line Status Register (LSR)
132 #define MCT_U232_LSR_INDEX 1 /* data[index] */
133 #define MCT_U232_LSR_ERR 0x80 /* OE | PE | FE | BI */
134 #define MCT_U232_LSR_TEMT 0x40 /* transmit register empty */
135 #define MCT_U232_LSR_THRE 0x20 /* transmit holding register empty */
136 #define MCT_U232_LSR_BI 0x10 /* break indicator */
137 #define MCT_U232_LSR_FE 0x08 /* framing error */
138 #define MCT_U232_LSR_OE 0x02 /* overrun error */
139 #define MCT_U232_LSR_PE 0x04 /* parity error */
140 #define MCT_U232_LSR_OE 0x02 /* overrun error */
141 #define MCT_U232_LSR_DR 0x01 /* receive data ready */
144 /* -----------------------------------------------------------------------------
145 * Technical Specification reverse engineered with SniffUSB on Windows98
146 * =====================================================================
148 * The technical details of the device have been acquired be using "SniffUSB"
149 * and the vendor-supplied device driver (version 2.3A) under Windows98. To
150 * identify the USB vendor-specific requests and to assign them to terminal
151 * settings (flow control, baud rate, etc.) the program "SerialSettings" from
152 * William G. Greathouse has been proven to be very useful. I also used the
153 * Win98 "HyperTerminal" and "usb-robot" on Linux for testing. The results and
154 * observations are summarized below:
156 * The USB requests seem to be directly mapped to the registers of a 8250,
157 * 16450 or 16550 UART. The FreeBSD handbook (appendix F.4 "Input/Output
158 * devices") contains a comprehensive description of UARTs and its registers.
159 * The bit descriptions are actually taken from there.
162 * Baud rate (divisor)
163 * -------------------
165 * BmRequestType: 0x40 (0100 0000B)
170 * Data: divisor = 115200 / baud_rate
172 * SniffUSB observations (Nov 2003): Contrary to the 'wLength' value of 4
173 * shown above, observations with a Belkin F5U109 adapter, using the
174 * MCT-supplied Windows98 driver (U2SPORT.VXD, "File version: 1.21P.0104 for
175 * Win98/Me"), show this request has a length of 1 byte, presumably because
176 * of the fact that the Belkin adapter and the 'Sitecom U232-P25' adapter
177 * use a baud-rate code instead of a conventional RS-232 baud rate divisor.
178 * The current source code for this driver does not reflect this fact, but
179 * the driver works fine with this adapter/driver combination nonetheless.
182 * Line Control Register (LCR)
183 * ---------------------------
185 * BmRequestType: 0x40 (0100 0000B) 0xc0 (1100 0000B)
186 * bRequest: 0x07 0x06
190 * Data: LCR (see below)
192 * Bit 7: Divisor Latch Access Bit (DLAB). When set, access to the data
193 * transmit/receive register (THR/RBR) and the Interrupt Enable Register
194 * (IER) is disabled. Any access to these ports is now redirected to the
195 * Divisor Latch Registers. Setting this bit, loading the Divisor
196 * Registers, and clearing DLAB should be done with interrupts disabled.
197 * Bit 6: Set Break. When set to "1", the transmitter begins to transmit
198 * continuous Spacing until this bit is set to "0". This overrides any
199 * bits of characters that are being transmitted.
200 * Bit 5: Stick Parity. When parity is enabled, setting this bit causes parity
201 * to always be "1" or "0", based on the value of Bit 4.
202 * Bit 4: Even Parity Select (EPS). When parity is enabled and Bit 5 is "0",
203 * setting this bit causes even parity to be transmitted and expected.
204 * Otherwise, odd parity is used.
205 * Bit 3: Parity Enable (PEN). When set to "1", a parity bit is inserted
206 * between the last bit of the data and the Stop Bit. The UART will also
207 * expect parity to be present in the received data.
208 * Bit 2: Number of Stop Bits (STB). If set to "1" and using 5-bit data words,
209 * 1.5 Stop Bits are transmitted and expected in each data word. For
210 * 6, 7 and 8-bit data words, 2 Stop Bits are transmitted and expected.
211 * When this bit is set to "0", one Stop Bit is used on each data word.
212 * Bit 1: Word Length Select Bit #1 (WLSB1)
213 * Bit 0: Word Length Select Bit #0 (WLSB0)
214 * Together these bits specify the number of bits in each data word.
221 * SniffUSB observations: Bit 7 seems not to be used. There seem to be two bugs
222 * in the Win98 driver: the break does not work (bit 6 is not asserted) and the
223 * stick parity bit is not cleared when set once. The LCR can also be read
224 * back with USB request 6 but this has never been observed with SniffUSB.
227 * Modem Control Register (MCR)
228 * ----------------------------
230 * BmRequestType: 0x40 (0100 0000B)
235 * Data: MCR (Bit 4..7, see below)
237 * Bit 7: Reserved, always 0.
238 * Bit 6: Reserved, always 0.
239 * Bit 5: Reserved, always 0.
240 * Bit 4: Loop-Back Enable. When set to "1", the UART transmitter and receiver
241 * are internally connected together to allow diagnostic operations. In
242 * addition, the UART modem control outputs are connected to the UART
243 * modem control inputs. CTS is connected to RTS, DTR is connected to
244 * DSR, OUT1 is connected to RI, and OUT 2 is connected to DCD.
245 * Bit 3: OUT 2. An auxiliary output that the host processor may set high or
246 * low. In the IBM PC serial adapter (and most clones), OUT 2 is used
247 * to tri-state (disable) the interrupt signal from the
248 * 8250/16450/16550 UART.
249 * Bit 2: OUT 1. An auxiliary output that the host processor may set high or
250 * low. This output is not used on the IBM PC serial adapter.
251 * Bit 1: Request to Send (RTS). When set to "1", the output of the UART -RTS
252 * line is Low (Active).
253 * Bit 0: Data Terminal Ready (DTR). When set to "1", the output of the UART
254 * -DTR line is Low (Active).
256 * SniffUSB observations: Bit 2 and 4 seem not to be used but bit 3 has been
260 * Modem Status Register (MSR)
261 * ---------------------------
263 * BmRequestType: 0xc0 (1100 0000B)
268 * Data: MSR (see below)
270 * Bit 7: Data Carrier Detect (CD). Reflects the state of the DCD line on the
272 * Bit 6: Ring Indicator (RI). Reflects the state of the RI line on the UART.
273 * Bit 5: Data Set Ready (DSR). Reflects the state of the DSR line on the UART.
274 * Bit 4: Clear To Send (CTS). Reflects the state of the CTS line on the UART.
275 * Bit 3: Delta Data Carrier Detect (DDCD). Set to "1" if the -DCD line has
276 * changed state one more more times since the last time the MSR was
278 * Bit 2: Trailing Edge Ring Indicator (TERI). Set to "1" if the -RI line has
279 * had a low to high transition since the last time the MSR was read by
281 * Bit 1: Delta Data Set Ready (DDSR). Set to "1" if the -DSR line has changed
282 * state one more more times since the last time the MSR was read by the
284 * Bit 0: Delta Clear To Send (DCTS). Set to "1" if the -CTS line has changed
285 * state one more times since the last time the MSR was read by the
288 * SniffUSB observations: the MSR is also returned as first byte on the
289 * interrupt-in endpoint 0x83 to signal changes of modem status lines. The USB
290 * request to read MSR cannot be applied during normal device operation.
293 * Line Status Register (LSR)
294 * --------------------------
296 * Bit 7 Error in Receiver FIFO. On the 8250/16450 UART, this bit is zero.
297 * This bit is set to "1" when any of the bytes in the FIFO have one
298 * or more of the following error conditions: PE, FE, or BI.
299 * Bit 6 Transmitter Empty (TEMT). When set to "1", there are no words
300 * remaining in the transmit FIFO or the transmit shift register. The
301 * transmitter is completely idle.
302 * Bit 5 Transmitter Holding Register Empty (THRE). When set to "1", the
303 * FIFO (or holding register) now has room for at least one additional
304 * word to transmit. The transmitter may still be transmitting when
305 * this bit is set to "1".
306 * Bit 4 Break Interrupt (BI). The receiver has detected a Break signal.
307 * Bit 3 Framing Error (FE). A Start Bit was detected but the Stop Bit did
308 * not appear at the expected time. The received word is probably
310 * Bit 2 Parity Error (PE). The parity bit was incorrect for the word
312 * Bit 1 Overrun Error (OE). A new word was received and there was no room
313 * in the receive buffer. The newly-arrived word in the shift register
314 * is discarded. On 8250/16450 UARTs, the word in the holding register
315 * is discarded and the newly- arrived word is put in the holding
317 * Bit 0 Data Ready (DR). One or more words are in the receive FIFO that the
318 * host may read. A word must be completely received and moved from
319 * the shift register into the FIFO (or holding register for
320 * 8250/16450 designs) before this bit is set.
322 * SniffUSB observations: the LSR is returned as second byte on the
323 * interrupt-in endpoint 0x83 to signal error conditions. Such errors have
324 * been seen with minicom/zmodem transfers (CRC errors).
328 * -------------------
330 * BmRequestType: 0x40 (0100 0000B)
337 * SniffUSB observations (Nov 2003): With the MCT-supplied Windows98 driver
338 * (U2SPORT.VXD, "File version: 1.21P.0104 for Win98/Me"), this request
339 * occurs immediately after a "Baud rate (divisor)" message. It was not
340 * observed at any other time. It is unclear what purpose this message
345 * -------------------
347 * BmRequestType: 0x40 (0100 0000B)
354 * SniffUSB observations (Nov 2003): With the MCT-supplied Windows98 driver
355 * (U2SPORT.VXD, "File version: 1.21P.0104 for Win98/Me"), this request
356 * occurs immediately after the 'Unknown #1' message (see above). It was
357 * not observed at any other time. It is unclear what other purpose (if
358 * any) this message might serve, but without it, the USB/RS-232 adapter
359 * will not write to RS-232 devices which do not assert the 'CTS' signal.
365 * SniffUSB observations: no flow control specific requests have been realized
366 * apart from DTR/RTS settings. Both signals are dropped for no flow control
367 * but asserted for hardware or software flow control.
373 * SniffUSB observations: the bulk-out endpoint 0x1 and interrupt-in endpoint
374 * 0x81 is used to transmit and receive characters. The second interrupt-in
375 * endpoint 0x83 signals exceptional conditions like modem line changes and
376 * errors. The first byte returned is the MSR and the second byte the LSR.
382 * Queued bulk transfers like used in visor.c did not work.
385 * Properties of the USB device used (as found in /var/log/messages)
386 * -----------------------------------------------------------------
388 * Manufacturer: MCT Corporation.
389 * Product: USB-232 Interfact Controller
390 * SerialNumber: U2S22050
393 * DescriptorType = 01
395 * Vendor:Product = 0711:0210
397 * NumConfigurations = 1
398 * Device version = 1.02
399 * Device Class:SubClass:Protocol = 00:00:00
400 * Per-interface classes
403 * bDescriptorType = 02
404 * wTotalLength = 0027
405 * bNumInterfaces = 01
406 * bConfigurationValue = 01
407 * iConfiguration = 00
412 * Alternate Setting: 0
414 * bDescriptorType = 04
415 * bInterfaceNumber = 00
416 * bAlternateSetting = 00
418 * bInterface Class:SubClass:Protocol = 00:00:00
422 * bDescriptorType = 05
423 * bEndpointAddress = 81 (in)
424 * bmAttributes = 03 (Interrupt)
425 * wMaxPacketSize = 0040
429 * bDescriptorType = 05
430 * bEndpointAddress = 01 (out)
431 * bmAttributes = 02 (Bulk)
432 * wMaxPacketSize = 0040
436 * bDescriptorType = 05
437 * bEndpointAddress = 83 (in)
438 * bmAttributes = 03 (Interrupt)
439 * wMaxPacketSize = 0002
443 * Hardware details (added by Martin Hamilton, 2001/12/06)
444 * -----------------------------------------------------------------
446 * This info was gleaned from opening a Belkin F5U109 DB9 USB serial
447 * adaptor, which turns out to simply be a re-badged U232-P9. We
448 * know this because there is a sticky label on the circuit board
449 * which says "U232-P9" ;-)
451 * The circuit board inside the adaptor contains a Philips PDIUSBD12
452 * USB endpoint chip and a Philips P87C52UBAA microcontroller with
453 * embedded UART. Exhaustive documentation for these is available at:
455 * http://www.semiconductors.philips.com/pip/p87c52ubaa
456 * http://www.nxp.com/acrobat_download/various/PDIUSBD12_PROGRAMMING_GUIDE.pdf
458 * Thanks to Julian Highfield for the pointer to the Philips database.
462 #endif /* __LINUX_USB_SERIAL_MCT_U232_H */