summaryrefslogtreecommitdiffstats
path: root/drivers/usb/serial/mct_u232.h
blob: 3a3f5e6b8f967bca45cf5cafa12d5dddcf3bb8cb (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
/*
 * 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

/* Get Modem Status Register (MSR) */
#define MCT_U232_GET_MODEM_STAT_REQUEST	2
#define MCT_U232_GET_MODEM_STAT_SIZE	1

/* Get Line Control Register (LCR) */
/* ... not used by this driver */
#define MCT_U232_GET_LINE_CTRL_REQUEST	6
#define MCT_U232_GET_LINE_CTRL_SIZE	1

/* Set Baud Rate Divisor */
#define MCT_U232_SET_BAUD_RATE_REQUEST	5
#define MCT_U232_SET_BAUD_RATE_SIZE	4

/* Set Line Control Register (LCR) */
#define MCT_U232_SET_LINE_CTRL_REQUEST	7
#define MCT_U232_SET_LINE_CTRL_SIZE	1

/* Set Modem Control Register (MCR) */
#define MCT_U232_SET_MODEM_CTRL_REQUEST	10
#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

#define MCT_U232_MAX_SIZE		4	/* of MCT_XXX_SIZE */

/*
 * 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,
					speed_t value, speed_t *result);

/*
 * 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 */

OpenPOWER on IntegriCloud