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[PATCH] USB: ftdi_sio vendor code for RR-CirKits LocoBuffer USB
[linux-2.6/openmoko-kernel.git] / drivers / usb / serial / ftdi_sio.c
blob5eb646ee0979af1cd2afe2fde41ed8083a5cc1b0
1 /*
2 * USB FTDI SIO driver
3 *
4 * Copyright (C) 1999 - 2001
5 * Greg Kroah-Hartman (greg@kroah.com)
6 * Bill Ryder (bryder@sgi.com)
7 * Copyright (C) 2002
8 * Kuba Ober (kuba@mareimbrium.org)
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
14 *
15 * See Documentation/usb/usb-serial.txt for more information on using this driver
16 *
17 * See http://ftdi-usb-sio.sourceforge.net for upto date testing info
18 * and extra documentation
19 *
20 * (21/Jul/2004) Ian Abbott
21 * Incorporated Steven Turner's code to add support for the FT2232C chip.
22 * The prelimilary port to the 2.6 kernel was by Rus V. Brushkoff. I have
23 * fixed a couple of things.
24 *
25 * (27/May/2004) Ian Abbott
26 * Improved throttling code, mostly stolen from the WhiteHEAT driver.
27 *
28 * (26/Mar/2004) Jan Capek
29 * Added PID's for ICD-U20/ICD-U40 - incircuit PIC debuggers from CCS Inc.
30 *
31 * (09/Feb/2004) Ian Abbott
32 * Changed full name of USB-UIRT device to avoid "/" character.
33 * Added FTDI's alternate PID (0x6006) for FT232/245 devices.
34 * Added PID for "ELV USB Module UO100" from Stefan Frings.
35 *
36 * (21/Oct/2003) Ian Abbott
37 * Renamed some VID/PID macros for Matrix Orbital and Perle Systems
38 * devices. Removed Matrix Orbital and Perle Systems devices from the
39 * 8U232AM device table, but left them in the FT232BM table, as they are
40 * known to use only FT232BM.
41 *
42 * (17/Oct/2003) Scott Allen
43 * Added vid/pid for Perle Systems UltraPort USB serial converters
44 *
45 * (21/Sep/2003) Ian Abbott
46 * Added VID/PID for Omnidirectional Control Technology US101 USB to
47 * RS-232 adapter (also rebadged as Dick Smith Electronics XH6381).
48 * VID/PID supplied by Donald Gordon.
49 *
50 * (19/Aug/2003) Ian Abbott
51 * Freed urb's transfer buffer in write bulk callback.
52 * Omitted some paranoid checks in write bulk callback that don't matter.
53 * Scheduled work in write bulk callback regardless of port's open count.
54 *
55 * (05/Aug/2003) Ian Abbott
56 * Added VID/PID for ID TECH IDT1221U USB to RS-232 adapter.
57 * VID/PID provided by Steve Briggs.
58 *
59 * (23/Jul/2003) Ian Abbott
60 * Added PIDs for CrystalFontz 547, 633, 631, 635, 640 and 640 from
61 * Wayne Wylupski.
62 *
63 * (10/Jul/2003) David Glance
64 * Added PID for DSS-20 SyncStation cradle for Sony-Ericsson P800.
65 *
66 * (27/Jun/2003) Ian Abbott
67 * Reworked the urb handling logic. We have no more pool, but dynamically
68 * allocate the urb and the transfer buffer on the fly. In testing this
69 * does not incure any measurable overhead. This also relies on the fact
70 * that we have proper reference counting logic for urbs. I nicked this
71 * from Greg KH's Visor driver.
72 *
73 * (23/Jun/2003) Ian Abbott
74 * Reduced flip buffer pushes and corrected a data length test in
75 * ftdi_read_bulk_callback.
76 * Defererence pointers after any paranoid checks, not before.
77 *
78 * (21/Jun/2003) Erik Nygren
79 * Added support for Home Electronics Tira-1 IR transceiver using FT232BM chip.
80 * See <http://www.home-electro.com/tira1.htm>. Only operates properly
81 * at 100000 and RTS-CTS, so set custom divisor mode on startup.
82 * Also force the Tira-1 and USB-UIRT to only use their custom baud rates.
83 *
84 * (18/Jun/2003) Ian Abbott
85 * Added Device ID of the USB relais from Rudolf Gugler (backported from
86 * Philipp Gühring's patch for 2.5.x kernel).
87 * Moved read transfer buffer reallocation into startup function.
88 * Free existing write urb and transfer buffer in startup function.
89 * Only use urbs in write urb pool that were successfully allocated.
90 * Moved some constant macros out of functions.
91 * Minor whitespace and comment changes.
92 *
93 * (12/Jun/2003) David Norwood
94 * Added support for USB-UIRT IR transceiver using 8U232AM chip.
95 * See <http://home.earthlink.net/~jrhees/USBUIRT/index.htm>. Only
96 * operates properly at 312500, so set custom divisor mode on startup.
97 *
98 * (12/Jun/2003) Ian Abbott
99 * Added Sealevel SeaLINK+ 210x, 220x, 240x, 280x vid/pids from Tuan Hoang
100 * - I've eliminated some that don't seem to exist!
101 * Added Home Electronics Tira-1 IR transceiver pid from Chris Horn
102 * Some whitespace/coding-style cleanups
103 *
104 * (11/Jun/2003) Ian Abbott
105 * Fixed unsafe spinlock usage in ftdi_write
106 *
107 * (24/Feb/2003) Richard Shooter
108 * Increase read buffer size to improve read speeds at higher baud rates
109 * (specifically tested with up to 1Mb/sec at 1.5M baud)
110 *
111 * (23/Feb/2003) John Wilkins
112 * Added Xon/xoff flow control (activating support in the ftdi device)
113 * Added vid/pid for Videonetworks/Homechoice (UK ISP)
114 *
115 * (23/Feb/2003) Bill Ryder
116 * Added matrix orb device vid/pids from Wayne Wylupski
117 *
118 * (19/Feb/2003) Ian Abbott
119 * For TIOCSSERIAL, set alt_speed to 0 when ASYNC_SPD_MASK value has
120 * changed to something other than ASYNC_SPD_HI, ASYNC_SPD_VHI,
121 * ASYNC_SPD_SHI or ASYNC_SPD_WARP. Also, unless ASYNC_SPD_CUST is in
122 * force, don't bother changing baud rate when custom_divisor has changed.
123 *
124 * (18/Feb/2003) Ian Abbott
125 * Fixed TIOCMGET handling to include state of DTR and RTS, the state
126 * of which are now saved by set_dtr() and set_rts().
127 * Fixed improper storage class for buf in set_dtr() and set_rts().
128 * Added FT232BM chip type and support for its extra baud rates (compared
129 * to FT8U232AM).
130 * Took account of special case divisor values for highest baud rates of
131 * FT8U232AM and FT232BM.
132 * For TIOCSSERIAL, forced alt_speed to 0 when ASYNC_SPD_CUST kludge used,
133 * as previous alt_speed setting is now stale.
134 * Moved startup code common between the startup routines for the
135 * different chip types into a common subroutine.
136 *
137 * (17/Feb/2003) Bill Ryder
138 * Added write urb buffer pool on a per device basis
139 * Added more checking for open file on callbacks (fixed OOPS)
140 * Added CrystalFontz 632 and 634 PIDs
141 * (thanx to CrystalFontz for the sample devices - they flushed out
142 * some driver bugs)
143 * Minor debugging message changes
144 * Added throttle, unthrottle and chars_in_buffer functions
145 * Fixed FTDI_SIO (the original device) bug
146 * Fixed some shutdown handling
147 *
148 *
149 *
150 *
151 * (07/Jun/2002) Kuba Ober
152 * Changed FTDI_SIO_BASE_BAUD_TO_DIVISOR macro into ftdi_baud_to_divisor
153 * function. It was getting too complex.
154 * Fix the divisor calculation logic which was setting divisor of 0.125
155 * instead of 0.5 for fractional parts of divisor equal to 5/8, 6/8, 7/8.
156 * Also make it bump up the divisor to next integer in case of 7/8 - it's
157 * a better approximation.
158 *
159 * (25/Jul/2002) Bill Ryder inserted Dmitri's TIOCMIWAIT patch
160 * Not tested by me but it doesn't break anything I use.
161 *
162 * (04/Jan/2002) Kuba Ober
163 * Implemented 38400 baudrate kludge, where it can be substituted with other
164 * values. That's the only way to set custom baudrates.
165 * Implemented TIOCSSERIAL, TIOCGSERIAL ioctl's so that setserial is happy.
166 * FIXME: both baudrate things should eventually go to usbserial.c as other
167 * devices may need that functionality too. Actually, it can probably be
168 * merged in serial.c somehow - too many drivers repeat this code over
169 * and over.
170 * Fixed baudrate forgetfulness - open() used to reset baudrate to 9600 every time.
171 * Divisors for baudrates are calculated by a macro.
172 * Small code cleanups. Ugly whitespace changes for Plato's sake only ;-].
173 *
174 * (04/Nov/2001) Bill Ryder
175 * Fixed bug in read_bulk_callback where incorrect urb buffer was used.
176 * Cleaned up write offset calculation
177 * Added write_room since default values can be incorrect for sio
178 * Changed write_bulk_callback to use same queue_task as other drivers
179 * (the previous version caused panics)
180 * Removed port iteration code since the device only has one I/O port and it
181 * was wrong anyway.
182 *
183 * (31/May/2001) gkh
184 * Switched from using spinlock to a semaphore, which fixes lots of problems.
185 *
186 * (23/May/2001) Bill Ryder
187 * Added runtime debug patch (thanx Tyson D Sawyer).
188 * Cleaned up comments for 8U232
189 * Added parity, framing and overrun error handling
190 * Added receive break handling.
191 *
192 * (04/08/2001) gb
193 * Identify version on module load.
194 *
195 * (18/March/2001) Bill Ryder
196 * (Not released)
197 * Added send break handling. (requires kernel patch too)
198 * Fixed 8U232AM hardware RTS/CTS etc status reporting.
199 * Added flipbuf fix copied from generic device
200 *
201 * (12/3/2000) Bill Ryder
202 * Added support for 8U232AM device.
203 * Moved PID and VIDs into header file only.
204 * Turned on low-latency for the tty (device will do high baudrates)
205 * Added shutdown routine to close files when device removed.
206 * More debug and error message cleanups.
207 *
208 * (11/13/2000) Bill Ryder
209 * Added spinlock protected open code and close code.
210 * Multiple opens work (sort of - see webpage mentioned above).
211 * Cleaned up comments. Removed multiple PID/VID definitions.
212 * Factorised cts/dtr code
213 * Made use of __FUNCTION__ in dbg's
214 *
215 * (11/01/2000) Adam J. Richter
216 * usb_device_id table support
217 *
218 * (10/05/2000) gkh
219 * Fixed bug with urb->dev not being set properly, now that the usb
220 * core needs it.
221 *
222 * (09/11/2000) gkh
223 * Removed DEBUG #ifdefs with call to usb_serial_debug_data
224 *
225 * (07/19/2000) gkh
226 * Added module_init and module_exit functions to handle the fact that this
227 * driver is a loadable module now.
228 *
229 * (04/04/2000) Bill Ryder
230 * Fixed bugs in TCGET/TCSET ioctls (by removing them - they are
231 * handled elsewhere in the tty io driver chain).
232 *
233 * (03/30/2000) Bill Ryder
234 * Implemented lots of ioctls
235 * Fixed a race condition in write
236 * Changed some dbg's to errs
237 *
238 * (03/26/2000) gkh
239 * Split driver up into device specific pieces.
240 *
241 */
242
243 /* Bill Ryder - bryder@sgi.com - wrote the FTDI_SIO implementation */
244 /* Thanx to FTDI for so kindly providing details of the protocol required */
245 /* to talk to the device */
246 /* Thanx to gkh and the rest of the usb dev group for all code I have assimilated :-) */
247
248 #include <linux/config.h>
249 #include <linux/kernel.h>
250 #include <linux/errno.h>
251 #include <linux/init.h>
252 #include <linux/slab.h>
253 #include <linux/tty.h>
254 #include <linux/tty_driver.h>
255 #include <linux/tty_flip.h>
256 #include <linux/module.h>
257 #include <linux/spinlock.h>
258 #include <asm/uaccess.h>
259 #include <linux/usb.h>
260 #include <linux/serial.h>
261 #include "usb-serial.h"
262 #include "ftdi_sio.h"
263
264 /*
265 * Version Information
266 */
267 #define DRIVER_VERSION "v1.4.3"
268 #define DRIVER_AUTHOR "Greg Kroah-Hartman <greg@kroah.com>, Bill Ryder <bryder@sgi.com>, Kuba Ober <kuba@mareimbrium.org>"
269 #define DRIVER_DESC "USB FTDI Serial Converters Driver"
270
271 static int debug;
272 static __u16 vendor = FTDI_VID;
273 static __u16 product;
274
275 /* struct ftdi_sio_quirk is used by devices requiring special attention. */
276 struct ftdi_sio_quirk {
277 void (*setup)(struct usb_serial *); /* Special settings during startup. */
278 };
279
280 static void ftdi_USB_UIRT_setup (struct usb_serial *serial);
281 static void ftdi_HE_TIRA1_setup (struct usb_serial *serial);
282
283 static struct ftdi_sio_quirk ftdi_USB_UIRT_quirk = {
284 .setup = ftdi_USB_UIRT_setup,
285 };
286
287 static struct ftdi_sio_quirk ftdi_HE_TIRA1_quirk = {
288 .setup = ftdi_HE_TIRA1_setup,
289 };
290
291 /*
292 * The 8U232AM has the same API as the sio except for:
293 * - it can support MUCH higher baudrates; up to:
294 * o 921600 for RS232 and 2000000 for RS422/485 at 48MHz
295 * o 230400 at 12MHz
296 * so .. 8U232AM's baudrate setting codes are different
297 * - it has a two byte status code.
298 * - it returns characters every 16ms (the FTDI does it every 40ms)
299 *
300 * the bcdDevice value is used to differentiate FT232BM and FT245BM from
301 * the earlier FT8U232AM and FT8U232BM. For now, include all known VID/PID
302 * combinations in both tables.
303 * FIXME: perhaps bcdDevice can also identify 12MHz FT8U232AM devices,
304 * but I don't know if those ever went into mass production. [Ian Abbott]
305 */
306
307
308
309 static struct usb_device_id id_table_combined [] = {
310 { USB_DEVICE(FTDI_VID, FTDI_IRTRANS_PID) },
311 { USB_DEVICE(FTDI_VID, FTDI_SIO_PID) },
312 { USB_DEVICE(FTDI_VID, FTDI_8U232AM_PID) },
313 { USB_DEVICE(FTDI_VID, FTDI_8U232AM_ALT_PID) },
314 { USB_DEVICE(FTDI_VID, FTDI_8U2232C_PID) },
315 { USB_DEVICE(FTDI_VID, FTDI_RELAIS_PID) },
316 { USB_DEVICE(INTERBIOMETRICS_VID, INTERBIOMETRICS_IOBOARD_PID) },
317 { USB_DEVICE(INTERBIOMETRICS_VID, INTERBIOMETRICS_MINI_IOBOARD_PID) },
318 { USB_DEVICE(FTDI_VID, FTDI_XF_632_PID) },
319 { USB_DEVICE(FTDI_VID, FTDI_XF_634_PID) },
320 { USB_DEVICE(FTDI_VID, FTDI_XF_547_PID) },
321 { USB_DEVICE(FTDI_VID, FTDI_XF_633_PID) },
322 { USB_DEVICE(FTDI_VID, FTDI_XF_631_PID) },
323 { USB_DEVICE(FTDI_VID, FTDI_XF_635_PID) },
324 { USB_DEVICE(FTDI_VID, FTDI_XF_640_PID) },
325 { USB_DEVICE(FTDI_VID, FTDI_XF_642_PID) },
326 { USB_DEVICE(FTDI_VID, FTDI_DSS20_PID) },
327 { USB_DEVICE(FTDI_NF_RIC_VID, FTDI_NF_RIC_PID) },
328 { USB_DEVICE(FTDI_VID, FTDI_VNHCPCUSB_D_PID) },
329 { USB_DEVICE(FTDI_VID, FTDI_MTXORB_0_PID) },
330 { USB_DEVICE(FTDI_VID, FTDI_MTXORB_1_PID) },
331 { USB_DEVICE(FTDI_VID, FTDI_MTXORB_2_PID) },
332 { USB_DEVICE(FTDI_VID, FTDI_MTXORB_3_PID) },
333 { USB_DEVICE(FTDI_VID, FTDI_MTXORB_4_PID) },
334 { USB_DEVICE(FTDI_VID, FTDI_MTXORB_5_PID) },
335 { USB_DEVICE(FTDI_VID, FTDI_MTXORB_6_PID) },
336 { USB_DEVICE(FTDI_VID, FTDI_PERLE_ULTRAPORT_PID) },
337 { USB_DEVICE(FTDI_VID, FTDI_PIEGROUP_PID) },
338 { USB_DEVICE(SEALEVEL_VID, SEALEVEL_2101_PID) },
339 { USB_DEVICE(SEALEVEL_VID, SEALEVEL_2102_PID) },
340 { USB_DEVICE(SEALEVEL_VID, SEALEVEL_2103_PID) },
341 { USB_DEVICE(SEALEVEL_VID, SEALEVEL_2104_PID) },
342 { USB_DEVICE(SEALEVEL_VID, SEALEVEL_2201_1_PID) },
343 { USB_DEVICE(SEALEVEL_VID, SEALEVEL_2201_2_PID) },
344 { USB_DEVICE(SEALEVEL_VID, SEALEVEL_2202_1_PID) },
345 { USB_DEVICE(SEALEVEL_VID, SEALEVEL_2202_2_PID) },
346 { USB_DEVICE(SEALEVEL_VID, SEALEVEL_2203_1_PID) },
347 { USB_DEVICE(SEALEVEL_VID, SEALEVEL_2203_2_PID) },
348 { USB_DEVICE(SEALEVEL_VID, SEALEVEL_2401_1_PID) },
349 { USB_DEVICE(SEALEVEL_VID, SEALEVEL_2401_2_PID) },
350 { USB_DEVICE(SEALEVEL_VID, SEALEVEL_2401_3_PID) },
351 { USB_DEVICE(SEALEVEL_VID, SEALEVEL_2401_4_PID) },
352 { USB_DEVICE(SEALEVEL_VID, SEALEVEL_2402_1_PID) },
353 { USB_DEVICE(SEALEVEL_VID, SEALEVEL_2402_2_PID) },
354 { USB_DEVICE(SEALEVEL_VID, SEALEVEL_2402_3_PID) },
355 { USB_DEVICE(SEALEVEL_VID, SEALEVEL_2402_4_PID) },
356 { USB_DEVICE(SEALEVEL_VID, SEALEVEL_2403_1_PID) },
357 { USB_DEVICE(SEALEVEL_VID, SEALEVEL_2403_2_PID) },
358 { USB_DEVICE(SEALEVEL_VID, SEALEVEL_2403_3_PID) },
359 { USB_DEVICE(SEALEVEL_VID, SEALEVEL_2403_4_PID) },
360 { USB_DEVICE(SEALEVEL_VID, SEALEVEL_2801_1_PID) },
361 { USB_DEVICE(SEALEVEL_VID, SEALEVEL_2801_2_PID) },
362 { USB_DEVICE(SEALEVEL_VID, SEALEVEL_2801_3_PID) },
363 { USB_DEVICE(SEALEVEL_VID, SEALEVEL_2801_4_PID) },
364 { USB_DEVICE(SEALEVEL_VID, SEALEVEL_2801_5_PID) },
365 { USB_DEVICE(SEALEVEL_VID, SEALEVEL_2801_6_PID) },
366 { USB_DEVICE(SEALEVEL_VID, SEALEVEL_2801_7_PID) },
367 { USB_DEVICE(SEALEVEL_VID, SEALEVEL_2801_8_PID) },
368 { USB_DEVICE(SEALEVEL_VID, SEALEVEL_2802_1_PID) },
369 { USB_DEVICE(SEALEVEL_VID, SEALEVEL_2802_2_PID) },
370 { USB_DEVICE(SEALEVEL_VID, SEALEVEL_2802_3_PID) },
371 { USB_DEVICE(SEALEVEL_VID, SEALEVEL_2802_4_PID) },
372 { USB_DEVICE(SEALEVEL_VID, SEALEVEL_2802_5_PID) },
373 { USB_DEVICE(SEALEVEL_VID, SEALEVEL_2802_6_PID) },
374 { USB_DEVICE(SEALEVEL_VID, SEALEVEL_2802_7_PID) },
375 { USB_DEVICE(SEALEVEL_VID, SEALEVEL_2802_8_PID) },
376 { USB_DEVICE(SEALEVEL_VID, SEALEVEL_2803_1_PID) },
377 { USB_DEVICE(SEALEVEL_VID, SEALEVEL_2803_2_PID) },
378 { USB_DEVICE(SEALEVEL_VID, SEALEVEL_2803_3_PID) },
379 { USB_DEVICE(SEALEVEL_VID, SEALEVEL_2803_4_PID) },
380 { USB_DEVICE(SEALEVEL_VID, SEALEVEL_2803_5_PID) },
381 { USB_DEVICE(SEALEVEL_VID, SEALEVEL_2803_6_PID) },
382 { USB_DEVICE(SEALEVEL_VID, SEALEVEL_2803_7_PID) },
383 { USB_DEVICE(SEALEVEL_VID, SEALEVEL_2803_8_PID) },
384 { USB_DEVICE(IDTECH_VID, IDTECH_IDT1221U_PID) },
385 { USB_DEVICE(OCT_VID, OCT_US101_PID) },
386 { USB_DEVICE(FTDI_VID, FTDI_HE_TIRA1_PID),
387 .driver_info = (kernel_ulong_t)&ftdi_HE_TIRA1_quirk },
388 { USB_DEVICE(FTDI_VID, FTDI_USB_UIRT_PID),
389 .driver_info = (kernel_ulong_t)&ftdi_USB_UIRT_quirk },
390 { USB_DEVICE(FTDI_VID, PROTEGO_SPECIAL_1) },
391 { USB_DEVICE(FTDI_VID, PROTEGO_R2X0) },
392 { USB_DEVICE(FTDI_VID, PROTEGO_SPECIAL_3) },
393 { USB_DEVICE(FTDI_VID, PROTEGO_SPECIAL_4) },
394 { USB_DEVICE(FTDI_VID, FTDI_GUDEADS_E808_PID) },
395 { USB_DEVICE(FTDI_VID, FTDI_GUDEADS_E809_PID) },
396 { USB_DEVICE(FTDI_VID, FTDI_GUDEADS_E80A_PID) },
397 { USB_DEVICE(FTDI_VID, FTDI_GUDEADS_E80B_PID) },
398 { USB_DEVICE(FTDI_VID, FTDI_GUDEADS_E80C_PID) },
399 { USB_DEVICE(FTDI_VID, FTDI_GUDEADS_E80D_PID) },
400 { USB_DEVICE(FTDI_VID, FTDI_GUDEADS_E80E_PID) },
401 { USB_DEVICE(FTDI_VID, FTDI_GUDEADS_E80F_PID) },
402 { USB_DEVICE(FTDI_VID, FTDI_GUDEADS_E888_PID) },
403 { USB_DEVICE(FTDI_VID, FTDI_GUDEADS_E889_PID) },
404 { USB_DEVICE(FTDI_VID, FTDI_GUDEADS_E88A_PID) },
405 { USB_DEVICE(FTDI_VID, FTDI_GUDEADS_E88B_PID) },
406 { USB_DEVICE(FTDI_VID, FTDI_GUDEADS_E88C_PID) },
407 { USB_DEVICE(FTDI_VID, FTDI_GUDEADS_E88D_PID) },
408 { USB_DEVICE(FTDI_VID, FTDI_GUDEADS_E88E_PID) },
409 { USB_DEVICE(FTDI_VID, FTDI_GUDEADS_E88F_PID) },
410 { USB_DEVICE(FTDI_VID, FTDI_ELV_UO100_PID) },
411 { USB_DEVICE(FTDI_VID, FTDI_ELV_UM100_PID) },
412 { USB_DEVICE(FTDI_VID, FTDI_ELV_UR100_PID) },
413 { USB_DEVICE(FTDI_VID, FTDI_ELV_ALC8500_PID) },
414 { USB_DEVICE(FTDI_VID, FTDI_PYRAMID_PID) },
415 { USB_DEVICE(FTDI_VID, FTDI_ELV_FHZ1000PC_PID) },
416 /*
417 * These will probably use user-space drivers. Uncomment them if
418 * you need them or use the user-specified vendor/product module
419 * parameters (see ftdi_sio.h for the numbers). Make a fuss if
420 * you think the driver should recognize any of them by default.
421 */
422 /* { USB_DEVICE(FTDI_VID, FTDI_ELV_CLI7000_PID) }, */
423 /* { USB_DEVICE(FTDI_VID, FTDI_ELV_PPS7330_PID) }, */
424 /* { USB_DEVICE(FTDI_VID, FTDI_ELV_TFM100_PID) }, */
425 /* { USB_DEVICE(FTDI_VID, FTDI_ELV_UDF77_PID) }, */
426 /* { USB_DEVICE(FTDI_VID, FTDI_ELV_UIO88_PID) }, */
427 /* { USB_DEVICE(FTDI_VID, FTDI_ELV_UAD8_PID) }, */
428 /* { USB_DEVICE(FTDI_VID, FTDI_ELV_UDA7_PID) }, */
429 /* { USB_DEVICE(FTDI_VID, FTDI_ELV_USI2_PID) }, */
430 /* { USB_DEVICE(FTDI_VID, FTDI_ELV_T1100_PID) }, */
431 /* { USB_DEVICE(FTDI_VID, FTDI_ELV_PCD200_PID) }, */
432 /* { USB_DEVICE(FTDI_VID, FTDI_ELV_ULA200_PID) }, */
433 /* { USB_DEVICE(FTDI_VID, FTDI_ELV_CSI8_PID) }, */
434 /* { USB_DEVICE(FTDI_VID, FTDI_ELV_EM1000DL_PID) }, */
435 /* { USB_DEVICE(FTDI_VID, FTDI_ELV_PCK100_PID) }, */
436 /* { USB_DEVICE(FTDI_VID, FTDI_ELV_RFP500_PID) }, */
437 /* { USB_DEVICE(FTDI_VID, FTDI_ELV_FS20SIG_PID) }, */
438 /* { USB_DEVICE(FTDI_VID, FTDI_ELV_WS300PC_PID) }, */
439 /* { USB_DEVICE(FTDI_VID, FTDI_ELV_FHZ1300PC_PID) }, */
440 /* { USB_DEVICE(FTDI_VID, FTDI_ELV_WS500_PID) }, */
441 { USB_DEVICE(FTDI_VID, LINX_SDMUSBQSS_PID) },
442 { USB_DEVICE(FTDI_VID, LINX_MASTERDEVEL2_PID) },
443 { USB_DEVICE(FTDI_VID, LINX_FUTURE_0_PID) },
444 { USB_DEVICE(FTDI_VID, LINX_FUTURE_1_PID) },
445 { USB_DEVICE(FTDI_VID, LINX_FUTURE_2_PID) },
446 { USB_DEVICE(FTDI_VID, FTDI_CCSICDU20_0_PID) },
447 { USB_DEVICE(FTDI_VID, FTDI_CCSICDU40_1_PID) },
448 { USB_DEVICE(FTDI_VID, INSIDE_ACCESSO) },
449 { USB_DEVICE(INTREPID_VID, INTREPID_VALUECAN_PID) },
450 { USB_DEVICE(INTREPID_VID, INTREPID_NEOVI_PID) },
451 { USB_DEVICE(FALCOM_VID, FALCOM_TWIST_PID) },
452 { USB_DEVICE(FALCOM_VID, FALCOM_SAMBA_PID) },
453 { USB_DEVICE(FTDI_VID, FTDI_SUUNTO_SPORTS_PID) },
454 { USB_DEVICE(FTDI_VID, FTDI_RM_CANVIEW_PID) },
455 { USB_DEVICE(BANDB_VID, BANDB_USOTL4_PID) },
456 { USB_DEVICE(BANDB_VID, BANDB_USTL4_PID) },
457 { USB_DEVICE(BANDB_VID, BANDB_USO9ML2_PID) },
458 { USB_DEVICE(FTDI_VID, EVER_ECO_PRO_CDS) },
459 { USB_DEVICE(FTDI_VID, FTDI_4N_GALAXY_DE_0_PID) },
460 { USB_DEVICE(FTDI_VID, FTDI_4N_GALAXY_DE_1_PID) },
461 { USB_DEVICE(FTDI_VID, FTDI_4N_GALAXY_DE_2_PID) },
462 { USB_DEVICE(FTDI_VID, XSENS_CONVERTER_0_PID) },
463 { USB_DEVICE(FTDI_VID, XSENS_CONVERTER_1_PID) },
464 { USB_DEVICE(FTDI_VID, XSENS_CONVERTER_2_PID) },
465 { USB_DEVICE(FTDI_VID, XSENS_CONVERTER_3_PID) },
466 { USB_DEVICE(FTDI_VID, XSENS_CONVERTER_4_PID) },
467 { USB_DEVICE(FTDI_VID, XSENS_CONVERTER_5_PID) },
468 { USB_DEVICE(FTDI_VID, XSENS_CONVERTER_6_PID) },
469 { USB_DEVICE(FTDI_VID, XSENS_CONVERTER_7_PID) },
470 { USB_DEVICE(MOBILITY_VID, MOBILITY_USB_SERIAL_PID) },
471 { USB_DEVICE(FTDI_VID, FTDI_ACTIVE_ROBOTS_PID) },
472 { USB_DEVICE(FTDI_VID, FTDI_MHAM_KW_PID) },
473 { USB_DEVICE(FTDI_VID, FTDI_MHAM_YS_PID) },
474 { USB_DEVICE(FTDI_VID, FTDI_MHAM_Y6_PID) },
475 { USB_DEVICE(FTDI_VID, FTDI_MHAM_Y8_PID) },
476 { USB_DEVICE(FTDI_VID, FTDI_MHAM_IC_PID) },
477 { USB_DEVICE(FTDI_VID, FTDI_MHAM_DB9_PID) },
478 { USB_DEVICE(FTDI_VID, FTDI_MHAM_RS232_PID) },
479 { USB_DEVICE(FTDI_VID, FTDI_MHAM_Y9_PID) },
480 { USB_DEVICE(FTDI_VID, FTDI_TERATRONIK_VCP_PID) },
481 { USB_DEVICE(FTDI_VID, FTDI_TERATRONIK_D2XX_PID) },
482 { USB_DEVICE(EVOLUTION_VID, EVOLUTION_ER1_PID) },
483 { USB_DEVICE(FTDI_VID, FTDI_ARTEMIS_PID) },
484 { USB_DEVICE(FTDI_VID, FTDI_ATIK_ATK16_PID) },
485 { USB_DEVICE(FTDI_VID, FTDI_ATIK_ATK16C_PID) },
486 { USB_DEVICE(FTDI_VID, FTDI_ATIK_ATK16HR_PID) },
487 { USB_DEVICE(FTDI_VID, FTDI_ATIK_ATK16HRC_PID) },
488 { USB_DEVICE(KOBIL_VID, KOBIL_CONV_B1_PID) },
489 { USB_DEVICE(KOBIL_VID, KOBIL_CONV_KAAN_PID) },
490 { USB_DEVICE(POSIFLEX_VID, POSIFLEX_PP7000_PID) },
491 { USB_DEVICE(FTDI_VID, FTDI_TTUSB_PID) },
492 { USB_DEVICE(FTDI_VID, FTDI_ECLO_COM_1WIRE_PID) },
493 { USB_DEVICE(FTDI_VID, FTDI_WESTREX_MODEL_777_PID) },
494 { USB_DEVICE(FTDI_VID, FTDI_WESTREX_MODEL_8900F_PID) },
495 { USB_DEVICE(FTDI_VID, FTDI_PCDJ_DAC2_PID) },
496 { USB_DEVICE(FTDI_VID, FTDI_RRCIRKITS_LOCOBUFFER_PID) },
497 { USB_DEVICE(ICOM_ID1_VID, ICOM_ID1_PID) },
498 { USB_DEVICE(PAPOUCH_VID, PAPOUCH_TMU_PID) },
499 { }, /* Optional parameter entry */
500 { } /* Terminating entry */
501 };
502
503 MODULE_DEVICE_TABLE (usb, id_table_combined);
504
505 static struct usb_driver ftdi_driver = {
506 .name = "ftdi_sio",
507 .probe = usb_serial_probe,
508 .disconnect = usb_serial_disconnect,
509 .id_table = id_table_combined,
510 .no_dynamic_id = 1,
511 };
512
513 static const char *ftdi_chip_name[] = {
514 [SIO] = "SIO", /* the serial part of FT8U100AX */
515 [FT8U232AM] = "FT8U232AM",
516 [FT232BM] = "FT232BM",
517 [FT2232C] = "FT2232C",
518 };
519
520
521 /* Constants for read urb and write urb */
522 #define BUFSZ 512
523 #define PKTSZ 64
524
525 /* rx_flags */
526 #define THROTTLED 0x01
527 #define ACTUALLY_THROTTLED 0x02
528
529 struct ftdi_private {
530 ftdi_chip_type_t chip_type;
531 /* type of the device, either SIO or FT8U232AM */
532 int baud_base; /* baud base clock for divisor setting */
533 int custom_divisor; /* custom_divisor kludge, this is for baud_base (different from what goes to the chip!) */
534 __u16 last_set_data_urb_value ;
535 /* the last data state set - needed for doing a break */
536 int write_offset; /* This is the offset in the usb data block to write the serial data -
537 * it is different between devices
538 */
539 int flags; /* some ASYNC_xxxx flags are supported */
540 unsigned long last_dtr_rts; /* saved modem control outputs */
541 wait_queue_head_t delta_msr_wait; /* Used for TIOCMIWAIT */
542 char prev_status, diff_status; /* Used for TIOCMIWAIT */
543 __u8 rx_flags; /* receive state flags (throttling) */
544 spinlock_t rx_lock; /* spinlock for receive state */
545 struct work_struct rx_work;
546 int rx_processed;
547
548 __u16 interface; /* FT2232C port interface (0 for FT232/245) */
549
550 int force_baud; /* if non-zero, force the baud rate to this value */
551 int force_rtscts; /* if non-zero, force RTS-CTS to always be enabled */
552 };
553
554 /* Used for TIOCMIWAIT */
555 #define FTDI_STATUS_B0_MASK (FTDI_RS0_CTS | FTDI_RS0_DSR | FTDI_RS0_RI | FTDI_RS0_RLSD)
556 #define FTDI_STATUS_B1_MASK (FTDI_RS_BI)
557 /* End TIOCMIWAIT */
558
559 #define FTDI_IMPL_ASYNC_FLAGS = ( ASYNC_SPD_HI | ASYNC_SPD_VHI \
560 ASYNC_SPD_CUST | ASYNC_SPD_SHI | ASYNC_SPD_WARP )
561
562 /* function prototypes for a FTDI serial converter */
563 static int ftdi_sio_probe (struct usb_serial *serial, const struct usb_device_id *id);
564 static int ftdi_sio_attach (struct usb_serial *serial);
565 static void ftdi_shutdown (struct usb_serial *serial);
566 static int ftdi_open (struct usb_serial_port *port, struct file *filp);
567 static void ftdi_close (struct usb_serial_port *port, struct file *filp);
568 static int ftdi_write (struct usb_serial_port *port, const unsigned char *buf, int count);
569 static int ftdi_write_room (struct usb_serial_port *port);
570 static int ftdi_chars_in_buffer (struct usb_serial_port *port);
571 static void ftdi_write_bulk_callback (struct urb *urb, struct pt_regs *regs);
572 static void ftdi_read_bulk_callback (struct urb *urb, struct pt_regs *regs);
573 static void ftdi_process_read (void *param);
574 static void ftdi_set_termios (struct usb_serial_port *port, struct termios * old);
575 static int ftdi_tiocmget (struct usb_serial_port *port, struct file *file);
576 static int ftdi_tiocmset (struct usb_serial_port *port, struct file * file, unsigned int set, unsigned int clear);
577 static int ftdi_ioctl (struct usb_serial_port *port, struct file * file, unsigned int cmd, unsigned long arg);
578 static void ftdi_break_ctl (struct usb_serial_port *port, int break_state );
579 static void ftdi_throttle (struct usb_serial_port *port);
580 static void ftdi_unthrottle (struct usb_serial_port *port);
581
582 static unsigned short int ftdi_232am_baud_base_to_divisor (int baud, int base);
583 static unsigned short int ftdi_232am_baud_to_divisor (int baud);
584 static __u32 ftdi_232bm_baud_base_to_divisor (int baud, int base);
585 static __u32 ftdi_232bm_baud_to_divisor (int baud);
586
587 static struct usb_serial_driver ftdi_sio_device = {
588 .driver = {
589 .owner = THIS_MODULE,
590 .name = "ftdi_sio",
591 },
592 .description = "FTDI USB Serial Device",
593 .id_table = id_table_combined,
594 .num_interrupt_in = 0,
595 .num_bulk_in = 1,
596 .num_bulk_out = 1,
597 .num_ports = 1,
598 .probe = ftdi_sio_probe,
599 .open = ftdi_open,
600 .close = ftdi_close,
601 .throttle = ftdi_throttle,
602 .unthrottle = ftdi_unthrottle,
603 .write = ftdi_write,
604 .write_room = ftdi_write_room,
605 .chars_in_buffer = ftdi_chars_in_buffer,
606 .read_bulk_callback = ftdi_read_bulk_callback,
607 .write_bulk_callback = ftdi_write_bulk_callback,
608 .tiocmget = ftdi_tiocmget,
609 .tiocmset = ftdi_tiocmset,
610 .ioctl = ftdi_ioctl,
611 .set_termios = ftdi_set_termios,
612 .break_ctl = ftdi_break_ctl,
613 .attach = ftdi_sio_attach,
614 .shutdown = ftdi_shutdown,
615 };
616
617
618 #define WDR_TIMEOUT 5000 /* default urb timeout */
619 #define WDR_SHORT_TIMEOUT 1000 /* shorter urb timeout */
620
621 /* High and low are for DTR, RTS etc etc */
622 #define HIGH 1
623 #define LOW 0
624
625 /*
626 * ***************************************************************************
627 * Utlity functions
628 * ***************************************************************************
629 */
630
631 static unsigned short int ftdi_232am_baud_base_to_divisor(int baud, int base)
632 {
633 unsigned short int divisor;
634 int divisor3 = base / 2 / baud; // divisor shifted 3 bits to the left
635 if ((divisor3 & 0x7) == 7) divisor3 ++; // round x.7/8 up to x+1
636 divisor = divisor3 >> 3;
637 divisor3 &= 0x7;
638 if (divisor3 == 1) divisor |= 0xc000; else // 0.125
639 if (divisor3 >= 4) divisor |= 0x4000; else // 0.5
640 if (divisor3 != 0) divisor |= 0x8000; // 0.25
641 if (divisor == 1) divisor = 0; /* special case for maximum baud rate */
642 return divisor;
643 }
644
645 static unsigned short int ftdi_232am_baud_to_divisor(int baud)
646 {
647 return(ftdi_232am_baud_base_to_divisor(baud, 48000000));
648 }
649
650 static __u32 ftdi_232bm_baud_base_to_divisor(int baud, int base)
651 {
652 static const unsigned char divfrac[8] = { 0, 3, 2, 4, 1, 5, 6, 7 };
653 __u32 divisor;
654 int divisor3 = base / 2 / baud; // divisor shifted 3 bits to the left
655 divisor = divisor3 >> 3;
656 divisor |= (__u32)divfrac[divisor3 & 0x7] << 14;
657 /* Deal with special cases for highest baud rates. */
658 if (divisor == 1) divisor = 0; else // 1.0
659 if (divisor == 0x4001) divisor = 1; // 1.5
660 return divisor;
661 }
662
663 static __u32 ftdi_232bm_baud_to_divisor(int baud)
664 {
665 return(ftdi_232bm_baud_base_to_divisor(baud, 48000000));
666 }
667
668 #define set_mctrl(port, set) update_mctrl((port), (set), 0)
669 #define clear_mctrl(port, clear) update_mctrl((port), 0, (clear))
670
671 static int update_mctrl(struct usb_serial_port *port, unsigned int set, unsigned int clear)
672 {
673 struct ftdi_private *priv = usb_get_serial_port_data(port);
674 char *buf;
675 unsigned urb_value;
676 int rv;
677
678 if (((set | clear) & (TIOCM_DTR | TIOCM_RTS)) == 0) {
679 dbg("%s - DTR|RTS not being set|cleared", __FUNCTION__);
680 return 0; /* no change */
681 }
682
683 buf = kmalloc(1, GFP_NOIO);
684 if (!buf) {
685 return -ENOMEM;
686 }
687
688 clear &= ~set; /* 'set' takes precedence over 'clear' */
689 urb_value = 0;
690 if (clear & TIOCM_DTR)
691 urb_value |= FTDI_SIO_SET_DTR_LOW;
692 if (clear & TIOCM_RTS)
693 urb_value |= FTDI_SIO_SET_RTS_LOW;
694 if (set & TIOCM_DTR)
695 urb_value |= FTDI_SIO_SET_DTR_HIGH;
696 if (set & TIOCM_RTS)
697 urb_value |= FTDI_SIO_SET_RTS_HIGH;
698 rv = usb_control_msg(port->serial->dev,
699 usb_sndctrlpipe(port->serial->dev, 0),
700 FTDI_SIO_SET_MODEM_CTRL_REQUEST,
701 FTDI_SIO_SET_MODEM_CTRL_REQUEST_TYPE,
702 urb_value, priv->interface,
703 buf, 0, WDR_TIMEOUT);
704
705 kfree(buf);
706 if (rv < 0) {
707 err("%s Error from MODEM_CTRL urb: DTR %s, RTS %s",
708 __FUNCTION__,
709 (set & TIOCM_DTR) ? "HIGH" :
710 (clear & TIOCM_DTR) ? "LOW" : "unchanged",
711 (set & TIOCM_RTS) ? "HIGH" :
712 (clear & TIOCM_RTS) ? "LOW" : "unchanged");
713 } else {
714 dbg("%s - DTR %s, RTS %s", __FUNCTION__,
715 (set & TIOCM_DTR) ? "HIGH" :
716 (clear & TIOCM_DTR) ? "LOW" : "unchanged",
717 (set & TIOCM_RTS) ? "HIGH" :
718 (clear & TIOCM_RTS) ? "LOW" : "unchanged");
719 priv->last_dtr_rts = (priv->last_dtr_rts & ~clear) | set;
720 }
721 return rv;
722 }
723
724
725 static __u32 get_ftdi_divisor(struct usb_serial_port * port);
726
727
728 static int change_speed(struct usb_serial_port *port)
729 {
730 struct ftdi_private *priv = usb_get_serial_port_data(port);
731 char *buf;
732 __u16 urb_value;
733 __u16 urb_index;
734 __u32 urb_index_value;
735 int rv;
736
737 buf = kmalloc(1, GFP_NOIO);
738 if (!buf)
739 return -ENOMEM;
740
741 urb_index_value = get_ftdi_divisor(port);
742 urb_value = (__u16)urb_index_value;
743 urb_index = (__u16)(urb_index_value >> 16);
744 if (priv->interface) { /* FT2232C */
745 urb_index = (__u16)((urb_index << 8) | priv->interface);
746 }
747
748 rv = usb_control_msg(port->serial->dev,
749 usb_sndctrlpipe(port->serial->dev, 0),
750 FTDI_SIO_SET_BAUDRATE_REQUEST,
751 FTDI_SIO_SET_BAUDRATE_REQUEST_TYPE,
752 urb_value, urb_index,
753 buf, 0, WDR_SHORT_TIMEOUT);
754
755 kfree(buf);
756 return rv;
757 }
758
759
760 static __u32 get_ftdi_divisor(struct usb_serial_port * port)
761 { /* get_ftdi_divisor */
762 struct ftdi_private *priv = usb_get_serial_port_data(port);
763 __u32 div_value = 0;
764 int div_okay = 1;
765 int baud;
766
767 /*
768 * The logic involved in setting the baudrate can be cleanly split in 3 steps.
769 * Obtaining the actual baud rate is a little tricky since unix traditionally
770 * somehow ignored the possibility to set non-standard baud rates.
771 * 1. Standard baud rates are set in tty->termios->c_cflag
772 * 2. If these are not enough, you can set any speed using alt_speed as follows:
773 * - set tty->termios->c_cflag speed to B38400
774 * - set your real speed in tty->alt_speed; it gets ignored when
775 * alt_speed==0, (or)
776 * - call TIOCSSERIAL ioctl with (struct serial_struct) set as follows:
777 * flags & ASYNC_SPD_MASK == ASYNC_SPD_[HI, VHI, SHI, WARP], this just
778 * sets alt_speed to (HI: 57600, VHI: 115200, SHI: 230400, WARP: 460800)
779 * ** Steps 1, 2 are done courtesy of tty_get_baud_rate
780 * 3. You can also set baud rate by setting custom divisor as follows
781 * - set tty->termios->c_cflag speed to B38400
782 * - call TIOCSSERIAL ioctl with (struct serial_struct) set as follows:
783 * o flags & ASYNC_SPD_MASK == ASYNC_SPD_CUST
784 * o custom_divisor set to baud_base / your_new_baudrate
785 * ** Step 3 is done courtesy of code borrowed from serial.c - I should really
786 * spend some time and separate+move this common code to serial.c, it is
787 * replicated in nearly every serial driver you see.
788 */
789
790 /* 1. Get the baud rate from the tty settings, this observes alt_speed hack */
791
792 baud = tty_get_baud_rate(port->tty);
793 dbg("%s - tty_get_baud_rate reports speed %d", __FUNCTION__, baud);
794
795 /* 2. Observe async-compatible custom_divisor hack, update baudrate if needed */
796
797 if (baud == 38400 &&
798 ((priv->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST) &&
799 (priv->custom_divisor)) {
800 baud = priv->baud_base / priv->custom_divisor;
801 dbg("%s - custom divisor %d sets baud rate to %d", __FUNCTION__, priv->custom_divisor, baud);
802 }
803
804 /* 3. Convert baudrate to device-specific divisor */
805
806 if (!baud) baud = 9600;
807 switch(priv->chip_type) {
808 case SIO: /* SIO chip */
809 switch(baud) {
810 case 300: div_value = ftdi_sio_b300; break;
811 case 600: div_value = ftdi_sio_b600; break;
812 case 1200: div_value = ftdi_sio_b1200; break;
813 case 2400: div_value = ftdi_sio_b2400; break;
814 case 4800: div_value = ftdi_sio_b4800; break;
815 case 9600: div_value = ftdi_sio_b9600; break;
816 case 19200: div_value = ftdi_sio_b19200; break;
817 case 38400: div_value = ftdi_sio_b38400; break;
818 case 57600: div_value = ftdi_sio_b57600; break;
819 case 115200: div_value = ftdi_sio_b115200; break;
820 } /* baud */
821 if (div_value == 0) {
822 dbg("%s - Baudrate (%d) requested is not supported", __FUNCTION__, baud);
823 div_value = ftdi_sio_b9600;
824 div_okay = 0;
825 }
826 break;
827 case FT8U232AM: /* 8U232AM chip */
828 if (baud <= 3000000) {
829 div_value = ftdi_232am_baud_to_divisor(baud);
830 } else {
831 dbg("%s - Baud rate too high!", __FUNCTION__);
832 div_value = ftdi_232am_baud_to_divisor(9600);
833 div_okay = 0;
834 }
835 break;
836 case FT232BM: /* FT232BM chip */
837 case FT2232C: /* FT2232C chip */
838 if (baud <= 3000000) {
839 div_value = ftdi_232bm_baud_to_divisor(baud);
840 } else {
841 dbg("%s - Baud rate too high!", __FUNCTION__);
842 div_value = ftdi_232bm_baud_to_divisor(9600);
843 div_okay = 0;
844 }
845 break;
846 } /* priv->chip_type */
847
848 if (div_okay) {
849 dbg("%s - Baud rate set to %d (divisor 0x%lX) on chip %s",
850 __FUNCTION__, baud, (unsigned long)div_value,
851 ftdi_chip_name[priv->chip_type]);
852 }
853
854 return(div_value);
855 }
856
857
858 static int get_serial_info(struct usb_serial_port * port, struct serial_struct __user * retinfo)
859 {
860 struct ftdi_private *priv = usb_get_serial_port_data(port);
861 struct serial_struct tmp;
862
863 if (!retinfo)
864 return -EFAULT;
865 memset(&tmp, 0, sizeof(tmp));
866 tmp.flags = priv->flags;
867 tmp.baud_base = priv->baud_base;
868 tmp.custom_divisor = priv->custom_divisor;
869 if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
870 return -EFAULT;
871 return 0;
872 } /* get_serial_info */
873
874
875 static int set_serial_info(struct usb_serial_port * port, struct serial_struct __user * newinfo)
876 { /* set_serial_info */
877 struct ftdi_private *priv = usb_get_serial_port_data(port);
878 struct serial_struct new_serial;
879 struct ftdi_private old_priv;
880
881 if (copy_from_user(&new_serial, newinfo, sizeof(new_serial)))
882 return -EFAULT;
883 old_priv = * priv;
884
885 /* Do error checking and permission checking */
886
887 if (!capable(CAP_SYS_ADMIN)) {
888 if (((new_serial.flags & ~ASYNC_USR_MASK) !=
889 (priv->flags & ~ASYNC_USR_MASK)))
890 return -EPERM;
891 priv->flags = ((priv->flags & ~ASYNC_USR_MASK) |
892 (new_serial.flags & ASYNC_USR_MASK));
893 priv->custom_divisor = new_serial.custom_divisor;
894 goto check_and_exit;
895 }
896
897 if ((new_serial.baud_base != priv->baud_base) &&
898 (new_serial.baud_base < 9600))
899 return -EINVAL;
900
901 /* Make the changes - these are privileged changes! */
902
903 priv->flags = ((priv->flags & ~ASYNC_FLAGS) |
904 (new_serial.flags & ASYNC_FLAGS));
905 priv->custom_divisor = new_serial.custom_divisor;
906
907 port->tty->low_latency = (priv->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
908
909 check_and_exit:
910 if ((old_priv.flags & ASYNC_SPD_MASK) !=
911 (priv->flags & ASYNC_SPD_MASK)) {
912 if ((priv->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
913 port->tty->alt_speed = 57600;
914 else if ((priv->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
915 port->tty->alt_speed = 115200;
916 else if ((priv->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI)
917 port->tty->alt_speed = 230400;
918 else if ((priv->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP)
919 port->tty->alt_speed = 460800;
920 else
921 port->tty->alt_speed = 0;
922 }
923 if (((old_priv.flags & ASYNC_SPD_MASK) !=
924 (priv->flags & ASYNC_SPD_MASK)) ||
925 (((priv->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST) &&
926 (old_priv.custom_divisor != priv->custom_divisor))) {
927 change_speed(port);
928 }
929
930 return (0);
931
932 } /* set_serial_info */
933
934
935 /* Determine type of FTDI chip based on USB config and descriptor. */
936 static void ftdi_determine_type(struct usb_serial_port *port)
937 {
938 struct ftdi_private *priv = usb_get_serial_port_data(port);
939 struct usb_serial *serial = port->serial;
940 struct usb_device *udev = serial->dev;
941 unsigned version;
942 unsigned interfaces;
943
944 /* Assume it is not the original SIO device for now. */
945 priv->baud_base = 48000000 / 2;
946 priv->write_offset = 0;
947
948 version = le16_to_cpu(udev->descriptor.bcdDevice);
949 interfaces = udev->actconfig->desc.bNumInterfaces;
950 dbg("%s: bcdDevice = 0x%x, bNumInterfaces = %u", __FUNCTION__,
951 version, interfaces);
952 if (interfaces > 1) {
953 int inter;
954
955 /* Multiple interfaces. Assume FT2232C. */
956 priv->chip_type = FT2232C;
957 /* Determine interface code. */
958 inter = serial->interface->altsetting->desc.bInterfaceNumber;
959 if (inter == 0) {
960 priv->interface = PIT_SIOA;
961 } else {
962 priv->interface = PIT_SIOB;
963 }
964 /* BM-type devices have a bug where bcdDevice gets set
965 * to 0x200 when iSerialNumber is 0. */
966 if (version < 0x500) {
967 dbg("%s: something fishy - bcdDevice too low for multi-interface device",
968 __FUNCTION__);
969 }
970 } else if (version < 0x200) {
971 /* Old device. Assume its the original SIO. */
972 priv->chip_type = SIO;
973 priv->baud_base = 12000000 / 16;
974 priv->write_offset = 1;
975 } else if (version < 0x400) {
976 /* Assume its an FT8U232AM (or FT8U245AM) */
977 /* (It might be a BM because of the iSerialNumber bug,
978 * but it will still work as an AM device.) */
979 priv->chip_type = FT8U232AM;
980 } else {
981 /* Assume its an FT232BM (or FT245BM) */
982 priv->chip_type = FT232BM;
983 }
984 info("Detected %s", ftdi_chip_name[priv->chip_type]);
985 }
986
987
988 /*
989 * ***************************************************************************
990 * Sysfs Attribute
991 * ***************************************************************************
992 */
993
994 static ssize_t show_latency_timer(struct device *dev, struct device_attribute *attr, char *buf)
995 {
996 struct usb_serial_port *port = to_usb_serial_port(dev);
997 struct ftdi_private *priv = usb_get_serial_port_data(port);
998 struct usb_device *udev;
999 unsigned short latency = 0;
1000 int rv = 0;
1001
1002 udev = to_usb_device(dev);
1003
1004 dbg("%s",__FUNCTION__);
1005
1006 rv = usb_control_msg(udev,
1007 usb_rcvctrlpipe(udev, 0),
1008 FTDI_SIO_GET_LATENCY_TIMER_REQUEST,
1009 FTDI_SIO_GET_LATENCY_TIMER_REQUEST_TYPE,
1010 0, priv->interface,
1011 (char*) &latency, 1, WDR_TIMEOUT);
1012
1013 if (rv < 0) {
1014 dev_err(dev, "Unable to read latency timer: %i", rv);
1015 return -EIO;
1016 }
1017 return sprintf(buf, "%i\n", latency);
1018 }
1019
1020 /* Write a new value of the latency timer, in units of milliseconds. */
1021 static ssize_t store_latency_timer(struct device *dev, struct device_attribute *attr, const char *valbuf,
1022 size_t count)
1023 {
1024 struct usb_serial_port *port = to_usb_serial_port(dev);
1025 struct ftdi_private *priv = usb_get_serial_port_data(port);
1026 struct usb_device *udev;
1027 char buf[1];
1028 int v = simple_strtoul(valbuf, NULL, 10);
1029 int rv = 0;
1030
1031 udev = to_usb_device(dev);
1032
1033 dbg("%s: setting latency timer = %i", __FUNCTION__, v);
1034
1035 rv = usb_control_msg(udev,
1036 usb_sndctrlpipe(udev, 0),
1037 FTDI_SIO_SET_LATENCY_TIMER_REQUEST,
1038 FTDI_SIO_SET_LATENCY_TIMER_REQUEST_TYPE,
1039 v, priv->interface,
1040 buf, 0, WDR_TIMEOUT);
1041
1042 if (rv < 0) {
1043 dev_err(dev, "Unable to write latency timer: %i", rv);
1044 return -EIO;
1045 }
1046
1047 return count;
1048 }
1049
1050 /* Write an event character directly to the FTDI register. The ASCII
1051 value is in the low 8 bits, with the enable bit in the 9th bit. */
1052 static ssize_t store_event_char(struct device *dev, struct device_attribute *attr, const char *valbuf,
1053 size_t count)
1054 {
1055 struct usb_serial_port *port = to_usb_serial_port(dev);
1056 struct ftdi_private *priv = usb_get_serial_port_data(port);
1057 struct usb_device *udev;
1058 char buf[1];
1059 int v = simple_strtoul(valbuf, NULL, 10);
1060 int rv = 0;
1061
1062 udev = to_usb_device(dev);
1063
1064 dbg("%s: setting event char = %i", __FUNCTION__, v);
1065
1066 rv = usb_control_msg(udev,
1067 usb_sndctrlpipe(udev, 0),
1068 FTDI_SIO_SET_EVENT_CHAR_REQUEST,
1069 FTDI_SIO_SET_EVENT_CHAR_REQUEST_TYPE,
1070 v, priv->interface,
1071 buf, 0, WDR_TIMEOUT);
1072
1073 if (rv < 0) {
1074 dbg("Unable to write event character: %i", rv);
1075 return -EIO;
1076 }
1077
1078 return count;
1079 }
1080
1081 static DEVICE_ATTR(latency_timer, S_IWUSR | S_IRUGO, show_latency_timer, store_latency_timer);
1082 static DEVICE_ATTR(event_char, S_IWUSR, NULL, store_event_char);
1083
1084 static void create_sysfs_attrs(struct usb_serial *serial)
1085 {
1086 struct ftdi_private *priv;
1087 struct usb_device *udev;
1088
1089 dbg("%s",__FUNCTION__);
1090
1091 priv = usb_get_serial_port_data(serial->port[0]);
1092 udev = serial->dev;
1093
1094 /* XXX I've no idea if the original SIO supports the event_char
1095 * sysfs parameter, so I'm playing it safe. */
1096 if (priv->chip_type != SIO) {
1097 dbg("sysfs attributes for %s", ftdi_chip_name[priv->chip_type]);
1098 device_create_file(&udev->dev, &dev_attr_event_char);
1099 if (priv->chip_type == FT232BM || priv->chip_type == FT2232C) {
1100 device_create_file(&udev->dev, &dev_attr_latency_timer);
1101 }
1102 }
1103 }
1104
1105 static void remove_sysfs_attrs(struct usb_serial *serial)
1106 {
1107 struct ftdi_private *priv;
1108 struct usb_device *udev;
1109
1110 dbg("%s",__FUNCTION__);
1111
1112 priv = usb_get_serial_port_data(serial->port[0]);
1113 udev = serial->dev;
1114
1115 /* XXX see create_sysfs_attrs */
1116 if (priv->chip_type != SIO) {
1117 device_remove_file(&udev->dev, &dev_attr_event_char);
1118 if (priv->chip_type == FT232BM || priv->chip_type == FT2232C) {
1119 device_remove_file(&udev->dev, &dev_attr_latency_timer);
1120 }
1121 }
1122
1123 }
1124
1125 /*
1126 * ***************************************************************************
1127 * FTDI driver specific functions
1128 * ***************************************************************************
1129 */
1130
1131 /* Probe function to check for special devices */
1132 static int ftdi_sio_probe (struct usb_serial *serial, const struct usb_device_id *id)
1133 {
1134 usb_set_serial_data(serial, (void *)id->driver_info);
1135
1136 return (0);
1137 }
1138
1139 /* attach subroutine */
1140 static int ftdi_sio_attach (struct usb_serial *serial)
1141 {
1142 struct usb_serial_port *port = serial->port[0];
1143 struct ftdi_private *priv;
1144 struct ftdi_sio_quirk *quirk;
1145
1146 dbg("%s",__FUNCTION__);
1147
1148 priv = kzalloc(sizeof(struct ftdi_private), GFP_KERNEL);
1149 if (!priv){
1150 err("%s- kmalloc(%Zd) failed.", __FUNCTION__, sizeof(struct ftdi_private));
1151 return -ENOMEM;
1152 }
1153
1154 spin_lock_init(&priv->rx_lock);
1155 init_waitqueue_head(&priv->delta_msr_wait);
1156 /* This will push the characters through immediately rather
1157 than queue a task to deliver them */
1158 priv->flags = ASYNC_LOW_LATENCY;
1159
1160 /* Increase the size of read buffers */
1161 kfree(port->bulk_in_buffer);
1162 port->bulk_in_buffer = kmalloc (BUFSZ, GFP_KERNEL);
1163 if (!port->bulk_in_buffer) {
1164 kfree (priv);
1165 return -ENOMEM;
1166 }
1167 if (port->read_urb) {
1168 port->read_urb->transfer_buffer = port->bulk_in_buffer;
1169 port->read_urb->transfer_buffer_length = BUFSZ;
1170 }
1171
1172 INIT_WORK(&priv->rx_work, ftdi_process_read, port);
1173
1174 /* Free port's existing write urb and transfer buffer. */
1175 if (port->write_urb) {
1176 usb_free_urb (port->write_urb);
1177 port->write_urb = NULL;
1178 }
1179 kfree(port->bulk_out_buffer);
1180 port->bulk_out_buffer = NULL;
1181
1182 usb_set_serial_port_data(serial->port[0], priv);
1183
1184 ftdi_determine_type (serial->port[0]);
1185 create_sysfs_attrs(serial);
1186
1187 /* Check for device requiring special set up. */
1188 quirk = (struct ftdi_sio_quirk *)usb_get_serial_data(serial);
1189 if (quirk && quirk->setup) {
1190 quirk->setup(serial);
1191 }
1192
1193 return (0);
1194 } /* ftdi_sio_attach */
1195
1196
1197 /* Setup for the USB-UIRT device, which requires hardwired
1198 * baudrate (38400 gets mapped to 312500) */
1199 /* Called from usbserial:serial_probe */
1200 static void ftdi_USB_UIRT_setup (struct usb_serial *serial)
1201 {
1202 struct ftdi_private *priv;
1203
1204 dbg("%s",__FUNCTION__);
1205
1206 priv = usb_get_serial_port_data(serial->port[0]);
1207 priv->flags |= ASYNC_SPD_CUST;
1208 priv->custom_divisor = 77;
1209 priv->force_baud = B38400;
1210 } /* ftdi_USB_UIRT_setup */
1211
1212 /* Setup for the HE-TIRA1 device, which requires hardwired
1213 * baudrate (38400 gets mapped to 100000) and RTS-CTS enabled. */
1214 static void ftdi_HE_TIRA1_setup (struct usb_serial *serial)
1215 {
1216 struct ftdi_private *priv;
1217
1218 dbg("%s",__FUNCTION__);
1219
1220 priv = usb_get_serial_port_data(serial->port[0]);
1221 priv->flags |= ASYNC_SPD_CUST;
1222 priv->custom_divisor = 240;
1223 priv->force_baud = B38400;
1224 priv->force_rtscts = 1;
1225 } /* ftdi_HE_TIRA1_setup */
1226
1227
1228 /* ftdi_shutdown is called from usbserial:usb_serial_disconnect
1229 * it is called when the usb device is disconnected
1230 *
1231 * usbserial:usb_serial_disconnect
1232 * calls __serial_close for each open of the port
1233 * shutdown is called then (ie ftdi_shutdown)
1234 */
1235
1236
1237 static void ftdi_shutdown (struct usb_serial *serial)
1238 { /* ftdi_shutdown */
1239
1240 struct usb_serial_port *port = serial->port[0];
1241 struct ftdi_private *priv = usb_get_serial_port_data(port);
1242
1243 dbg("%s", __FUNCTION__);
1244
1245 remove_sysfs_attrs(serial);
1246
1247 /* all open ports are closed at this point
1248 * (by usbserial.c:__serial_close, which calls ftdi_close)
1249 */
1250
1251 if (priv) {
1252 usb_set_serial_port_data(port, NULL);
1253 kfree(priv);
1254 }
1255 } /* ftdi_shutdown */
1256
1257
1258 static int ftdi_open (struct usb_serial_port *port, struct file *filp)
1259 { /* ftdi_open */
1260 struct termios tmp_termios;
1261 struct usb_device *dev = port->serial->dev;
1262 struct ftdi_private *priv = usb_get_serial_port_data(port);
1263 unsigned long flags;
1264
1265 int result = 0;
1266 char buf[1]; /* Needed for the usb_control_msg I think */
1267
1268 dbg("%s", __FUNCTION__);
1269
1270
1271 port->tty->low_latency = (priv->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
1272
1273 /* No error checking for this (will get errors later anyway) */
1274 /* See ftdi_sio.h for description of what is reset */
1275 usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
1276 FTDI_SIO_RESET_REQUEST, FTDI_SIO_RESET_REQUEST_TYPE,
1277 FTDI_SIO_RESET_SIO,
1278 priv->interface, buf, 0, WDR_TIMEOUT);
1279
1280 /* Termios defaults are set by usb_serial_init. We don't change
1281 port->tty->termios - this would loose speed settings, etc.
1282 This is same behaviour as serial.c/rs_open() - Kuba */
1283
1284 /* ftdi_set_termios will send usb control messages */
1285 ftdi_set_termios(port, &tmp_termios);
1286
1287 /* FIXME: Flow control might be enabled, so it should be checked -
1288 we have no control of defaults! */
1289 /* Turn on RTS and DTR since we are not flow controlling by default */
1290 set_mctrl(port, TIOCM_DTR | TIOCM_RTS);
1291
1292 /* Not throttled */
1293 spin_lock_irqsave(&priv->rx_lock, flags);
1294 priv->rx_flags &= ~(THROTTLED | ACTUALLY_THROTTLED);
1295 spin_unlock_irqrestore(&priv->rx_lock, flags);
1296
1297 /* Start reading from the device */
1298 priv->rx_processed = 0;
1299 usb_fill_bulk_urb(port->read_urb, dev,
1300 usb_rcvbulkpipe(dev, port->bulk_in_endpointAddress),
1301 port->read_urb->transfer_buffer, port->read_urb->transfer_buffer_length,
1302 ftdi_read_bulk_callback, port);
1303 result = usb_submit_urb(port->read_urb, GFP_KERNEL);
1304 if (result)
1305 err("%s - failed submitting read urb, error %d", __FUNCTION__, result);
1306
1307
1308 return result;
1309 } /* ftdi_open */
1310
1311
1312
1313 /*
1314 * usbserial:__serial_close only calls ftdi_close if the point is open
1315 *
1316 * This only gets called when it is the last close
1317 *
1318 *
1319 */
1320
1321 static void ftdi_close (struct usb_serial_port *port, struct file *filp)
1322 { /* ftdi_close */
1323 unsigned int c_cflag = port->tty->termios->c_cflag;
1324 struct ftdi_private *priv = usb_get_serial_port_data(port);
1325 char buf[1];
1326
1327 dbg("%s", __FUNCTION__);
1328
1329 if (c_cflag & HUPCL){
1330 /* Disable flow control */
1331 if (usb_control_msg(port->serial->dev,
1332 usb_sndctrlpipe(port->serial->dev, 0),
1333 FTDI_SIO_SET_FLOW_CTRL_REQUEST,
1334 FTDI_SIO_SET_FLOW_CTRL_REQUEST_TYPE,
1335 0, priv->interface, buf, 0,
1336 WDR_TIMEOUT) < 0) {
1337 err("error from flowcontrol urb");
1338 }
1339
1340 /* drop RTS and DTR */
1341 clear_mctrl(port, TIOCM_DTR | TIOCM_RTS);
1342 } /* Note change no line if hupcl is off */
1343
1344 /* cancel any scheduled reading */
1345 cancel_delayed_work(&priv->rx_work);
1346 flush_scheduled_work();
1347
1348 /* shutdown our bulk read */
1349 if (port->read_urb)
1350 usb_kill_urb(port->read_urb);
1351 } /* ftdi_close */
1352
1353
1354
1355 /* The SIO requires the first byte to have:
1356 * B0 1
1357 * B1 0
1358 * B2..7 length of message excluding byte 0
1359 *
1360 * The new devices do not require this byte
1361 */
1362 static int ftdi_write (struct usb_serial_port *port,
1363 const unsigned char *buf, int count)
1364 { /* ftdi_write */
1365 struct ftdi_private *priv = usb_get_serial_port_data(port);
1366 struct urb *urb;
1367 unsigned char *buffer;
1368 int data_offset ; /* will be 1 for the SIO and 0 otherwise */
1369 int status;
1370 int transfer_size;
1371
1372 dbg("%s port %d, %d bytes", __FUNCTION__, port->number, count);
1373
1374 if (count == 0) {
1375 dbg("write request of 0 bytes");
1376 return 0;
1377 }
1378
1379 data_offset = priv->write_offset;
1380 dbg("data_offset set to %d",data_offset);
1381
1382 /* Determine total transfer size */
1383 transfer_size = count;
1384 if (data_offset > 0) {
1385 /* Original sio needs control bytes too... */
1386 transfer_size += (data_offset *
1387 ((count + (PKTSZ - 1 - data_offset)) /
1388 (PKTSZ - data_offset)));
1389 }
1390
1391 buffer = kmalloc (transfer_size, GFP_ATOMIC);
1392 if (!buffer) {
1393 err("%s ran out of kernel memory for urb ...", __FUNCTION__);
1394 return -ENOMEM;
1395 }
1396
1397 urb = usb_alloc_urb(0, GFP_ATOMIC);
1398 if (!urb) {
1399 err("%s - no more free urbs", __FUNCTION__);
1400 kfree (buffer);
1401 return -ENOMEM;
1402 }
1403
1404 /* Copy data */
1405 if (data_offset > 0) {
1406 /* Original sio requires control byte at start of each packet. */
1407 int user_pktsz = PKTSZ - data_offset;
1408 int todo = count;
1409 unsigned char *first_byte = buffer;
1410 const unsigned char *current_position = buf;
1411
1412 while (todo > 0) {
1413 if (user_pktsz > todo) {
1414 user_pktsz = todo;
1415 }
1416 /* Write the control byte at the front of the packet*/
1417 *first_byte = 1 | ((user_pktsz) << 2);
1418 /* Copy data for packet */
1419 memcpy (first_byte + data_offset,
1420 current_position, user_pktsz);
1421 first_byte += user_pktsz + data_offset;
1422 current_position += user_pktsz;
1423 todo -= user_pktsz;
1424 }
1425 } else {
1426 /* No control byte required. */
1427 /* Copy in the data to send */
1428 memcpy (buffer, buf, count);
1429 }
1430
1431 usb_serial_debug_data(debug, &port->dev, __FUNCTION__, transfer_size, buffer);
1432
1433 /* fill the buffer and send it */
1434 usb_fill_bulk_urb(urb, port->serial->dev,
1435 usb_sndbulkpipe(port->serial->dev, port->bulk_out_endpointAddress),
1436 buffer, transfer_size,
1437 ftdi_write_bulk_callback, port);
1438
1439 status = usb_submit_urb(urb, GFP_ATOMIC);
1440 if (status) {
1441 err("%s - failed submitting write urb, error %d", __FUNCTION__, status);
1442 count = status;
1443 kfree (buffer);
1444 }
1445
1446 /* we are done with this urb, so let the host driver
1447 * really free it when it is finished with it */
1448 usb_free_urb (urb);
1449
1450 dbg("%s write returning: %d", __FUNCTION__, count);
1451 return count;
1452 } /* ftdi_write */
1453
1454
1455 /* This function may get called when the device is closed */
1456
1457 static void ftdi_write_bulk_callback (struct urb *urb, struct pt_regs *regs)
1458 {
1459 struct usb_serial_port *port = (struct usb_serial_port *)urb->context;
1460
1461 /* free up the transfer buffer, as usb_free_urb() does not do this */
1462 kfree (urb->transfer_buffer);
1463
1464 dbg("%s - port %d", __FUNCTION__, port->number);
1465
1466 if (urb->status) {
1467 dbg("nonzero write bulk status received: %d", urb->status);
1468 return;
1469 }
1470
1471 schedule_work(&port->work);
1472 } /* ftdi_write_bulk_callback */
1473
1474
1475 static int ftdi_write_room( struct usb_serial_port *port )
1476 {
1477 dbg("%s - port %d", __FUNCTION__, port->number);
1478
1479 /*
1480 * We really can take anything the user throws at us
1481 * but let's pick a nice big number to tell the tty
1482 * layer that we have lots of free space
1483 */
1484 return 2048;
1485 } /* ftdi_write_room */
1486
1487
1488 static int ftdi_chars_in_buffer (struct usb_serial_port *port)
1489 { /* ftdi_chars_in_buffer */
1490 dbg("%s - port %d", __FUNCTION__, port->number);
1491
1492 /*
1493 * We can't really account for how much data we
1494 * have sent out, but hasn't made it through to the
1495 * device, so just tell the tty layer that everything
1496 * is flushed.
1497 */
1498 return 0;
1499 } /* ftdi_chars_in_buffer */
1500
1501
1502
1503 static void ftdi_read_bulk_callback (struct urb *urb, struct pt_regs *regs)
1504 { /* ftdi_read_bulk_callback */
1505 struct usb_serial_port *port = (struct usb_serial_port *)urb->context;
1506 struct tty_struct *tty;
1507 struct ftdi_private *priv;
1508
1509 if (urb->number_of_packets > 0) {
1510 err("%s transfer_buffer_length %d actual_length %d number of packets %d",__FUNCTION__,
1511 urb->transfer_buffer_length, urb->actual_length, urb->number_of_packets );
1512 err("%s transfer_flags %x ", __FUNCTION__,urb->transfer_flags );
1513 }
1514
1515 dbg("%s - port %d", __FUNCTION__, port->number);
1516
1517 if (port->open_count <= 0)
1518 return;
1519
1520 tty = port->tty;
1521 if (!tty) {
1522 dbg("%s - bad tty pointer - exiting",__FUNCTION__);
1523 return;
1524 }
1525
1526 priv = usb_get_serial_port_data(port);
1527 if (!priv) {
1528 dbg("%s - bad port private data pointer - exiting", __FUNCTION__);
1529 return;
1530 }
1531
1532 if (urb != port->read_urb) {
1533 err("%s - Not my urb!", __FUNCTION__);
1534 }
1535
1536 if (urb->status) {
1537 /* This will happen at close every time so it is a dbg not an err */
1538 dbg("(this is ok on close) nonzero read bulk status received: %d", urb->status);
1539 return;
1540 }
1541
1542 ftdi_process_read(port);
1543
1544 } /* ftdi_read_bulk_callback */
1545
1546
1547 static void ftdi_process_read (void *param)
1548 { /* ftdi_process_read */
1549 struct usb_serial_port *port = (struct usb_serial_port*)param;
1550 struct urb *urb;
1551 struct tty_struct *tty;
1552 struct ftdi_private *priv;
1553 char error_flag;
1554 unsigned char *data;
1555
1556 int i;
1557 int result;
1558 int need_flip;
1559 int packet_offset;
1560 unsigned long flags;
1561
1562 dbg("%s - port %d", __FUNCTION__, port->number);
1563
1564 if (port->open_count <= 0)
1565 return;
1566
1567 tty = port->tty;
1568 if (!tty) {
1569 dbg("%s - bad tty pointer - exiting",__FUNCTION__);
1570 return;
1571 }
1572
1573 priv = usb_get_serial_port_data(port);
1574 if (!priv) {
1575 dbg("%s - bad port private data pointer - exiting", __FUNCTION__);
1576 return;
1577 }
1578
1579 urb = port->read_urb;
1580 if (!urb) {
1581 dbg("%s - bad read_urb pointer - exiting", __FUNCTION__);
1582 return;
1583 }
1584
1585 data = urb->transfer_buffer;
1586
1587 if (priv->rx_processed) {
1588 dbg("%s - already processed: %d bytes, %d remain", __FUNCTION__,
1589 priv->rx_processed,
1590 urb->actual_length - priv->rx_processed);
1591 } else {
1592 /* The first two bytes of every read packet are status */
1593 if (urb->actual_length > 2) {
1594 usb_serial_debug_data(debug, &port->dev, __FUNCTION__, urb->actual_length, data);
1595 } else {
1596 dbg("Status only: %03oo %03oo",data[0],data[1]);
1597 }
1598 }
1599
1600
1601 /* TO DO -- check for hung up line and handle appropriately: */
1602 /* send hangup */
1603 /* See acm.c - you do a tty_hangup - eg tty_hangup(tty) */
1604 /* if CD is dropped and the line is not CLOCAL then we should hangup */
1605
1606 need_flip = 0;
1607 for (packet_offset = priv->rx_processed; packet_offset < urb->actual_length; packet_offset += PKTSZ) {
1608 int length;
1609
1610 /* Compare new line status to the old one, signal if different */
1611 /* N.B. packet may be processed more than once, but differences
1612 * are only processed once. */
1613 if (priv != NULL) {
1614 char new_status = data[packet_offset+0] & FTDI_STATUS_B0_MASK;
1615 if (new_status != priv->prev_status) {
1616 priv->diff_status |= new_status ^ priv->prev_status;
1617 wake_up_interruptible(&priv->delta_msr_wait);
1618 priv->prev_status = new_status;
1619 }
1620 }
1621
1622 length = min(PKTSZ, urb->actual_length-packet_offset)-2;
1623 if (length < 0) {
1624 err("%s - bad packet length: %d", __FUNCTION__, length+2);
1625 length = 0;
1626 }
1627
1628 if (priv->rx_flags & THROTTLED) {
1629 dbg("%s - throttled", __FUNCTION__);
1630 break;
1631 }
1632 if (tty_buffer_request_room(tty, length) < length) {
1633 /* break out & wait for throttling/unthrottling to happen */
1634 dbg("%s - receive room low", __FUNCTION__);
1635 break;
1636 }
1637
1638 /* Handle errors and break */
1639 error_flag = TTY_NORMAL;
1640 /* Although the device uses a bitmask and hence can have multiple */
1641 /* errors on a packet - the order here sets the priority the */
1642 /* error is returned to the tty layer */
1643
1644 if ( data[packet_offset+1] & FTDI_RS_OE ) {
1645 error_flag = TTY_OVERRUN;
1646 dbg("OVERRRUN error");
1647 }
1648 if ( data[packet_offset+1] & FTDI_RS_BI ) {
1649 error_flag = TTY_BREAK;
1650 dbg("BREAK received");
1651 }
1652 if ( data[packet_offset+1] & FTDI_RS_PE ) {
1653 error_flag = TTY_PARITY;
1654 dbg("PARITY error");
1655 }
1656 if ( data[packet_offset+1] & FTDI_RS_FE ) {
1657 error_flag = TTY_FRAME;
1658 dbg("FRAMING error");
1659 }
1660 if (length > 0) {
1661 for (i = 2; i < length+2; i++) {
1662 /* Note that the error flag is duplicated for
1663 every character received since we don't know
1664 which character it applied to */
1665 tty_insert_flip_char(tty, data[packet_offset+i], error_flag);
1666 }
1667 need_flip = 1;
1668 }
1669
1670 #ifdef NOT_CORRECT_BUT_KEEPING_IT_FOR_NOW
1671 /* if a parity error is detected you get status packets forever
1672 until a character is sent without a parity error.
1673 This doesn't work well since the application receives a never
1674 ending stream of bad data - even though new data hasn't been sent.
1675 Therefore I (bill) have taken this out.
1676 However - this might make sense for framing errors and so on
1677 so I am leaving the code in for now.
1678 */
1679 else {
1680 if (error_flag != TTY_NORMAL){
1681 dbg("error_flag is not normal");
1682 /* In this case it is just status - if that is an error send a bad character */
1683 if(tty->flip.count >= TTY_FLIPBUF_SIZE) {
1684 tty_flip_buffer_push(tty);
1685 }
1686 tty_insert_flip_char(tty, 0xff, error_flag);
1687 need_flip = 1;
1688 }
1689 }
1690 #endif
1691 } /* "for(packet_offset=0..." */
1692
1693 /* Low latency */
1694 if (need_flip) {
1695 tty_flip_buffer_push(tty);
1696 }
1697
1698 if (packet_offset < urb->actual_length) {
1699 /* not completely processed - record progress */
1700 priv->rx_processed = packet_offset;
1701 dbg("%s - incomplete, %d bytes processed, %d remain",
1702 __FUNCTION__, packet_offset,
1703 urb->actual_length - packet_offset);
1704 /* check if we were throttled while processing */
1705 spin_lock_irqsave(&priv->rx_lock, flags);
1706 if (priv->rx_flags & THROTTLED) {
1707 priv->rx_flags |= ACTUALLY_THROTTLED;
1708 spin_unlock_irqrestore(&priv->rx_lock, flags);
1709 dbg("%s - deferring remainder until unthrottled",
1710 __FUNCTION__);
1711 return;
1712 }
1713 spin_unlock_irqrestore(&priv->rx_lock, flags);
1714 /* if the port is closed stop trying to read */
1715 if (port->open_count > 0){
1716 /* delay processing of remainder */
1717 schedule_delayed_work(&priv->rx_work, 1);
1718 } else {
1719 dbg("%s - port is closed", __FUNCTION__);
1720 }
1721 return;
1722 }
1723
1724 /* urb is completely processed */
1725 priv->rx_processed = 0;
1726
1727 /* if the port is closed stop trying to read */
1728 if (port->open_count > 0){
1729 /* Continue trying to always read */
1730 usb_fill_bulk_urb(port->read_urb, port->serial->dev,
1731 usb_rcvbulkpipe(port->serial->dev, port->bulk_in_endpointAddress),
1732 port->read_urb->transfer_buffer, port->read_urb->transfer_buffer_length,
1733 ftdi_read_bulk_callback, port);
1734
1735 result = usb_submit_urb(port->read_urb, GFP_ATOMIC);
1736 if (result)
1737 err("%s - failed resubmitting read urb, error %d", __FUNCTION__, result);
1738 }
1739
1740 return;
1741 } /* ftdi_process_read */
1742
1743
1744 static void ftdi_break_ctl( struct usb_serial_port *port, int break_state )
1745 {
1746 struct ftdi_private *priv = usb_get_serial_port_data(port);
1747 __u16 urb_value = 0;
1748 char buf[1];
1749
1750 /* break_state = -1 to turn on break, and 0 to turn off break */
1751 /* see drivers/char/tty_io.c to see it used */
1752 /* last_set_data_urb_value NEVER has the break bit set in it */
1753
1754 if (break_state) {
1755 urb_value = priv->last_set_data_urb_value | FTDI_SIO_SET_BREAK;
1756 } else {
1757 urb_value = priv->last_set_data_urb_value;
1758 }
1759
1760
1761 if (usb_control_msg(port->serial->dev, usb_sndctrlpipe(port->serial->dev, 0),
1762 FTDI_SIO_SET_DATA_REQUEST,
1763 FTDI_SIO_SET_DATA_REQUEST_TYPE,
1764 urb_value , priv->interface,
1765 buf, 0, WDR_TIMEOUT) < 0) {
1766 err("%s FAILED to enable/disable break state (state was %d)", __FUNCTION__,break_state);
1767 }
1768
1769 dbg("%s break state is %d - urb is %d", __FUNCTION__,break_state, urb_value);
1770
1771 }
1772
1773
1774 /* old_termios contains the original termios settings and tty->termios contains
1775 * the new setting to be used
1776 * WARNING: set_termios calls this with old_termios in kernel space
1777 */
1778
1779 static void ftdi_set_termios (struct usb_serial_port *port, struct termios *old_termios)
1780 { /* ftdi_termios */
1781 struct usb_device *dev = port->serial->dev;
1782 unsigned int cflag = port->tty->termios->c_cflag;
1783 struct ftdi_private *priv = usb_get_serial_port_data(port);
1784 __u16 urb_value; /* will hold the new flags */
1785 char buf[1]; /* Perhaps I should dynamically alloc this? */
1786
1787 // Added for xon/xoff support
1788 unsigned int iflag = port->tty->termios->c_iflag;
1789 unsigned char vstop;
1790 unsigned char vstart;
1791
1792 dbg("%s", __FUNCTION__);
1793
1794 /* Force baud rate if this device requires it, unless it is set to B0. */
1795 if (priv->force_baud && ((port->tty->termios->c_cflag & CBAUD) != B0)) {
1796 dbg("%s: forcing baud rate for this device", __FUNCTION__);
1797 port->tty->termios->c_cflag &= ~CBAUD;
1798 port->tty->termios->c_cflag |= priv->force_baud;
1799 }
1800
1801 /* Force RTS-CTS if this device requires it. */
1802 if (priv->force_rtscts) {
1803 dbg("%s: forcing rtscts for this device", __FUNCTION__);
1804 port->tty->termios->c_cflag |= CRTSCTS;
1805 }
1806
1807 cflag = port->tty->termios->c_cflag;
1808
1809 /* FIXME -For this cut I don't care if the line is really changing or
1810 not - so just do the change regardless - should be able to
1811 compare old_termios and tty->termios */
1812 /* NOTE These routines can get interrupted by
1813 ftdi_sio_read_bulk_callback - need to examine what this
1814 means - don't see any problems yet */
1815
1816 /* Set number of data bits, parity, stop bits */
1817
1818 urb_value = 0;
1819 urb_value |= (cflag & CSTOPB ? FTDI_SIO_SET_DATA_STOP_BITS_2 :
1820 FTDI_SIO_SET_DATA_STOP_BITS_1);
1821 urb_value |= (cflag & PARENB ?
1822 (cflag & PARODD ? FTDI_SIO_SET_DATA_PARITY_ODD :
1823 FTDI_SIO_SET_DATA_PARITY_EVEN) :
1824 FTDI_SIO_SET_DATA_PARITY_NONE);
1825 if (cflag & CSIZE) {
1826 switch (cflag & CSIZE) {
1827 case CS5: urb_value |= 5; dbg("Setting CS5"); break;
1828 case CS6: urb_value |= 6; dbg("Setting CS6"); break;
1829 case CS7: urb_value |= 7; dbg("Setting CS7"); break;
1830 case CS8: urb_value |= 8; dbg("Setting CS8"); break;
1831 default:
1832 err("CSIZE was set but not CS5-CS8");
1833 }
1834 }
1835
1836 /* This is needed by the break command since it uses the same command - but is
1837 * or'ed with this value */
1838 priv->last_set_data_urb_value = urb_value;
1839
1840 if (usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
1841 FTDI_SIO_SET_DATA_REQUEST,
1842 FTDI_SIO_SET_DATA_REQUEST_TYPE,
1843 urb_value , priv->interface,
1844 buf, 0, WDR_SHORT_TIMEOUT) < 0) {
1845 err("%s FAILED to set databits/stopbits/parity", __FUNCTION__);
1846 }
1847
1848 /* Now do the baudrate */
1849 if ((cflag & CBAUD) == B0 ) {
1850 /* Disable flow control */
1851 if (usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
1852 FTDI_SIO_SET_FLOW_CTRL_REQUEST,
1853 FTDI_SIO_SET_FLOW_CTRL_REQUEST_TYPE,
1854 0, priv->interface,
1855 buf, 0, WDR_TIMEOUT) < 0) {
1856 err("%s error from disable flowcontrol urb", __FUNCTION__);
1857 }
1858 /* Drop RTS and DTR */
1859 clear_mctrl(port, TIOCM_DTR | TIOCM_RTS);
1860 } else {
1861 /* set the baudrate determined before */
1862 if (change_speed(port)) {
1863 err("%s urb failed to set baudrate", __FUNCTION__);
1864 }
1865 /* Ensure RTS and DTR are raised when baudrate changed from 0 */
1866 if ((old_termios->c_cflag & CBAUD) == B0) {
1867 set_mctrl(port, TIOCM_DTR | TIOCM_RTS);
1868 }
1869 }
1870
1871 /* Set flow control */
1872 /* Note device also supports DTR/CD (ugh) and Xon/Xoff in hardware */
1873 if (cflag & CRTSCTS) {
1874 dbg("%s Setting to CRTSCTS flow control", __FUNCTION__);
1875 if (usb_control_msg(dev,
1876 usb_sndctrlpipe(dev, 0),
1877 FTDI_SIO_SET_FLOW_CTRL_REQUEST,
1878 FTDI_SIO_SET_FLOW_CTRL_REQUEST_TYPE,
1879 0 , (FTDI_SIO_RTS_CTS_HS | priv->interface),
1880 buf, 0, WDR_TIMEOUT) < 0) {
1881 err("urb failed to set to rts/cts flow control");
1882 }
1883
1884 } else {
1885 /*
1886 * Xon/Xoff code
1887 *
1888 * Check the IXOFF status in the iflag component of the termios structure
1889 * if IXOFF is not set, the pre-xon/xoff code is executed.
1890 */
1891 if (iflag & IXOFF) {
1892 dbg("%s request to enable xonxoff iflag=%04x",__FUNCTION__,iflag);
1893 // Try to enable the XON/XOFF on the ftdi_sio
1894 // Set the vstart and vstop -- could have been done up above where
1895 // a lot of other dereferencing is done but that would be very
1896 // inefficient as vstart and vstop are not always needed
1897 vstart=port->tty->termios->c_cc[VSTART];
1898 vstop=port->tty->termios->c_cc[VSTOP];
1899 urb_value=(vstop << 8) | (vstart);
1900
1901 if (usb_control_msg(dev,
1902 usb_sndctrlpipe(dev, 0),
1903 FTDI_SIO_SET_FLOW_CTRL_REQUEST,
1904 FTDI_SIO_SET_FLOW_CTRL_REQUEST_TYPE,
1905 urb_value , (FTDI_SIO_XON_XOFF_HS
1906 | priv->interface),
1907 buf, 0, WDR_TIMEOUT) < 0) {
1908 err("urb failed to set to xon/xoff flow control");
1909 }
1910 } else {
1911 /* else clause to only run if cfag ! CRTSCTS and iflag ! XOFF */
1912 /* CHECKME Assuming XON/XOFF handled by tty stack - not by device */
1913 dbg("%s Turning off hardware flow control", __FUNCTION__);
1914 if (usb_control_msg(dev,
1915 usb_sndctrlpipe(dev, 0),
1916 FTDI_SIO_SET_FLOW_CTRL_REQUEST,
1917 FTDI_SIO_SET_FLOW_CTRL_REQUEST_TYPE,
1918 0, priv->interface,
1919 buf, 0, WDR_TIMEOUT) < 0) {
1920 err("urb failed to clear flow control");
1921 }
1922 }
1923
1924 }
1925 return;
1926 } /* ftdi_termios */
1927
1928
1929 static int ftdi_tiocmget (struct usb_serial_port *port, struct file *file)
1930 {
1931 struct ftdi_private *priv = usb_get_serial_port_data(port);
1932 unsigned char buf[2];
1933 int ret;
1934
1935 dbg("%s TIOCMGET", __FUNCTION__);
1936 switch (priv->chip_type) {
1937 case SIO:
1938 /* Request the status from the device */
1939 if ((ret = usb_control_msg(port->serial->dev,
1940 usb_rcvctrlpipe(port->serial->dev, 0),
1941 FTDI_SIO_GET_MODEM_STATUS_REQUEST,
1942 FTDI_SIO_GET_MODEM_STATUS_REQUEST_TYPE,
1943 0, 0,
1944 buf, 1, WDR_TIMEOUT)) < 0 ) {
1945 err("%s Could not get modem status of device - err: %d", __FUNCTION__,
1946 ret);
1947 return(ret);
1948 }
1949 break;
1950 case FT8U232AM:
1951 case FT232BM:
1952 case FT2232C:
1953 /* the 8U232AM returns a two byte value (the sio is a 1 byte value) - in the same
1954 format as the data returned from the in point */
1955 if ((ret = usb_control_msg(port->serial->dev,
1956 usb_rcvctrlpipe(port->serial->dev, 0),
1957 FTDI_SIO_GET_MODEM_STATUS_REQUEST,
1958 FTDI_SIO_GET_MODEM_STATUS_REQUEST_TYPE,
1959 0, priv->interface,
1960 buf, 2, WDR_TIMEOUT)) < 0 ) {
1961 err("%s Could not get modem status of device - err: %d", __FUNCTION__,
1962 ret);
1963 return(ret);
1964 }
1965 break;
1966 default:
1967 return -EFAULT;
1968 break;
1969 }
1970
1971 return (buf[0] & FTDI_SIO_DSR_MASK ? TIOCM_DSR : 0) |
1972 (buf[0] & FTDI_SIO_CTS_MASK ? TIOCM_CTS : 0) |
1973 (buf[0] & FTDI_SIO_RI_MASK ? TIOCM_RI : 0) |
1974 (buf[0] & FTDI_SIO_RLSD_MASK ? TIOCM_CD : 0) |
1975 priv->last_dtr_rts;
1976 }
1977
1978 static int ftdi_tiocmset(struct usb_serial_port *port, struct file * file, unsigned int set, unsigned int clear)
1979 {
1980 dbg("%s TIOCMSET", __FUNCTION__);
1981 return update_mctrl(port, set, clear);
1982 }
1983
1984
1985 static int ftdi_ioctl (struct usb_serial_port *port, struct file * file, unsigned int cmd, unsigned long arg)
1986 {
1987 struct ftdi_private *priv = usb_get_serial_port_data(port);
1988
1989 dbg("%s cmd 0x%04x", __FUNCTION__, cmd);
1990
1991 /* Based on code from acm.c and others */
1992 switch (cmd) {
1993
1994 case TIOCGSERIAL: /* gets serial port data */
1995 return get_serial_info(port, (struct serial_struct __user *) arg);
1996
1997 case TIOCSSERIAL: /* sets serial port data */
1998 return set_serial_info(port, (struct serial_struct __user *) arg);
1999
2000 /*
2001 * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change
2002 * - mask passed in arg for lines of interest
2003 * (use |'ed TIOCM_RNG/DSR/CD/CTS for masking)
2004 * Caller should use TIOCGICOUNT to see which one it was.
2005 *
2006 * This code is borrowed from linux/drivers/char/serial.c
2007 */
2008 case TIOCMIWAIT:
2009 while (priv != NULL) {
2010 interruptible_sleep_on(&priv->delta_msr_wait);
2011 /* see if a signal did it */
2012 if (signal_pending(current))
2013 return -ERESTARTSYS;
2014 else {
2015 char diff = priv->diff_status;
2016
2017 if (diff == 0) {
2018 return -EIO; /* no change => error */
2019 }
2020
2021 /* Consume all events */
2022 priv->diff_status = 0;
2023
2024 /* Return 0 if caller wanted to know about these bits */
2025 if ( ((arg & TIOCM_RNG) && (diff & FTDI_RS0_RI)) ||
2026 ((arg & TIOCM_DSR) && (diff & FTDI_RS0_DSR)) ||
2027 ((arg & TIOCM_CD) && (diff & FTDI_RS0_RLSD)) ||
2028 ((arg & TIOCM_CTS) && (diff & FTDI_RS0_CTS)) ) {
2029 return 0;
2030 }
2031 /*
2032 * Otherwise caller can't care less about what happened,
2033 * and so we continue to wait for more events.
2034 */
2035 }
2036 }
2037 return(0);
2038 break;
2039 default:
2040 break;
2041
2042 }
2043
2044
2045 /* This is not necessarily an error - turns out the higher layers will do
2046 * some ioctls itself (see comment above)
2047 */
2048 dbg("%s arg not supported - it was 0x%04x - check /usr/include/asm/ioctls.h", __FUNCTION__, cmd);
2049
2050 return(-ENOIOCTLCMD);
2051 } /* ftdi_ioctl */
2052
2053
2054 static void ftdi_throttle (struct usb_serial_port *port)
2055 {
2056 struct ftdi_private *priv = usb_get_serial_port_data(port);
2057 unsigned long flags;
2058
2059 dbg("%s - port %d", __FUNCTION__, port->number);
2060
2061 spin_lock_irqsave(&priv->rx_lock, flags);
2062 priv->rx_flags |= THROTTLED;
2063 spin_unlock_irqrestore(&priv->rx_lock, flags);
2064 }
2065
2066
2067 static void ftdi_unthrottle (struct usb_serial_port *port)
2068 {
2069 struct ftdi_private *priv = usb_get_serial_port_data(port);
2070 int actually_throttled;
2071 unsigned long flags;
2072
2073 dbg("%s - port %d", __FUNCTION__, port->number);
2074
2075 spin_lock_irqsave(&priv->rx_lock, flags);
2076 actually_throttled = priv->rx_flags & ACTUALLY_THROTTLED;
2077 priv->rx_flags &= ~(THROTTLED | ACTUALLY_THROTTLED);
2078 spin_unlock_irqrestore(&priv->rx_lock, flags);
2079
2080 if (actually_throttled)
2081 schedule_work(&priv->rx_work);
2082 }
2083
2084 static int __init ftdi_init (void)
2085 {
2086 int retval;
2087
2088 dbg("%s", __FUNCTION__);
2089 if (vendor > 0 && product > 0) {
2090 /* Add user specified VID/PID to reserved element of table. */
2091 int i;
2092 for (i = 0; id_table_combined[i].idVendor; i++)
2093 ;
2094 id_table_combined[i].match_flags = USB_DEVICE_ID_MATCH_DEVICE;
2095 id_table_combined[i].idVendor = vendor;
2096 id_table_combined[i].idProduct = product;
2097 }
2098 retval = usb_serial_register(&ftdi_sio_device);
2099 if (retval)
2100 goto failed_sio_register;
2101 retval = usb_register(&ftdi_driver);
2102 if (retval)
2103 goto failed_usb_register;
2104
2105 info(DRIVER_VERSION ":" DRIVER_DESC);
2106 return 0;
2107 failed_usb_register:
2108 usb_serial_deregister(&ftdi_sio_device);
2109 failed_sio_register:
2110 return retval;
2111 }
2112
2113
2114 static void __exit ftdi_exit (void)
2115 {
2116
2117 dbg("%s", __FUNCTION__);
2118
2119 usb_deregister (&ftdi_driver);
2120 usb_serial_deregister (&ftdi_sio_device);
2121
2122 }
2123
2124
2125 module_init(ftdi_init);
2126 module_exit(ftdi_exit);
2127
2128 MODULE_AUTHOR( DRIVER_AUTHOR );
2129 MODULE_DESCRIPTION( DRIVER_DESC );
2130 MODULE_LICENSE("GPL");
2131
2132 module_param(debug, bool, S_IRUGO | S_IWUSR);
2133 MODULE_PARM_DESC(debug, "Debug enabled or not");
2134 module_param(vendor, ushort, 0);
2135 MODULE_PARM_DESC(vendor, "User specified vendor ID (default="
2136 __MODULE_STRING(FTDI_VID)")");
2137 module_param(product, ushort, 0);
2138 MODULE_PARM_DESC(vendor, "User specified product ID");
2139
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