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[PATCH] USB: move usb-serial.h to include/linux/usb/
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / usb / serial / ftdi_sio.c
blobb458aedc5fb6ae541166fc8f66da7cc91f5cb22f
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/kernel.h>
249 #include <linux/errno.h>
250 #include <linux/init.h>
251 #include <linux/slab.h>
252 #include <linux/tty.h>
253 #include <linux/tty_driver.h>
254 #include <linux/tty_flip.h>
255 #include <linux/module.h>
256 #include <linux/spinlock.h>
257 #include <asm/uaccess.h>
258 #include <linux/usb.h>
259 #include <linux/serial.h>
260 #include <linux/usb/serial.h>
261 #include "ftdi_sio.h"
262
263 /*
264 * Version Information
265 */
266 #define DRIVER_VERSION "v1.4.3"
267 #define DRIVER_AUTHOR "Greg Kroah-Hartman <greg@kroah.com>, Bill Ryder <bryder@sgi.com>, Kuba Ober <kuba@mareimbrium.org>"
268 #define DRIVER_DESC "USB FTDI Serial Converters Driver"
269
270 static int debug;
271 static __u16 vendor = FTDI_VID;
272 static __u16 product;
273
274 /* struct ftdi_sio_quirk is used by devices requiring special attention. */
275 struct ftdi_sio_quirk {
276 void (*setup)(struct usb_serial *); /* Special settings during startup. */
277 };
278
279 static void ftdi_USB_UIRT_setup (struct usb_serial *serial);
280 static void ftdi_HE_TIRA1_setup (struct usb_serial *serial);
281
282 static struct ftdi_sio_quirk ftdi_USB_UIRT_quirk = {
283 .setup = ftdi_USB_UIRT_setup,
284 };
285
286 static struct ftdi_sio_quirk ftdi_HE_TIRA1_quirk = {
287 .setup = ftdi_HE_TIRA1_setup,
288 };
289
290 /*
291 * The 8U232AM has the same API as the sio except for:
292 * - it can support MUCH higher baudrates; up to:
293 * o 921600 for RS232 and 2000000 for RS422/485 at 48MHz
294 * o 230400 at 12MHz
295 * so .. 8U232AM's baudrate setting codes are different
296 * - it has a two byte status code.
297 * - it returns characters every 16ms (the FTDI does it every 40ms)
298 *
299 * the bcdDevice value is used to differentiate FT232BM and FT245BM from
300 * the earlier FT8U232AM and FT8U232BM. For now, include all known VID/PID
301 * combinations in both tables.
302 * FIXME: perhaps bcdDevice can also identify 12MHz FT8U232AM devices,
303 * but I don't know if those ever went into mass production. [Ian Abbott]
304 */
305
306
307
308 static struct usb_device_id id_table_combined [] = {
309 { USB_DEVICE(FTDI_VID, FTDI_ACTZWAVE_PID) },
310 { USB_DEVICE(FTDI_VID, FTDI_IRTRANS_PID) },
311 { USB_DEVICE(FTDI_VID, FTDI_IPLUS_PID) },
312 { USB_DEVICE(FTDI_VID, FTDI_SIO_PID) },
313 { USB_DEVICE(FTDI_VID, FTDI_8U232AM_PID) },
314 { USB_DEVICE(FTDI_VID, FTDI_8U232AM_ALT_PID) },
315 { USB_DEVICE(FTDI_VID, FTDI_8U2232C_PID) },
316 { USB_DEVICE(FTDI_VID, FTDI_MICRO_CHAMELEON_PID) },
317 { USB_DEVICE(FTDI_VID, FTDI_RELAIS_PID) },
318 { USB_DEVICE(INTERBIOMETRICS_VID, INTERBIOMETRICS_IOBOARD_PID) },
319 { USB_DEVICE(INTERBIOMETRICS_VID, INTERBIOMETRICS_MINI_IOBOARD_PID) },
320 { USB_DEVICE(FTDI_VID, FTDI_XF_632_PID) },
321 { USB_DEVICE(FTDI_VID, FTDI_XF_634_PID) },
322 { USB_DEVICE(FTDI_VID, FTDI_XF_547_PID) },
323 { USB_DEVICE(FTDI_VID, FTDI_XF_633_PID) },
324 { USB_DEVICE(FTDI_VID, FTDI_XF_631_PID) },
325 { USB_DEVICE(FTDI_VID, FTDI_XF_635_PID) },
326 { USB_DEVICE(FTDI_VID, FTDI_XF_640_PID) },
327 { USB_DEVICE(FTDI_VID, FTDI_XF_642_PID) },
328 { USB_DEVICE(FTDI_VID, FTDI_DSS20_PID) },
329 { USB_DEVICE(FTDI_NF_RIC_VID, FTDI_NF_RIC_PID) },
330 { USB_DEVICE(FTDI_VID, FTDI_VNHCPCUSB_D_PID) },
331 { USB_DEVICE(FTDI_VID, FTDI_MTXORB_0_PID) },
332 { USB_DEVICE(FTDI_VID, FTDI_MTXORB_1_PID) },
333 { USB_DEVICE(FTDI_VID, FTDI_MTXORB_2_PID) },
334 { USB_DEVICE(FTDI_VID, FTDI_MTXORB_3_PID) },
335 { USB_DEVICE(FTDI_VID, FTDI_MTXORB_4_PID) },
336 { USB_DEVICE(FTDI_VID, FTDI_MTXORB_5_PID) },
337 { USB_DEVICE(FTDI_VID, FTDI_MTXORB_6_PID) },
338 { USB_DEVICE(FTDI_VID, FTDI_PERLE_ULTRAPORT_PID) },
339 { USB_DEVICE(FTDI_VID, FTDI_PIEGROUP_PID) },
340 { USB_DEVICE(SEALEVEL_VID, SEALEVEL_2101_PID) },
341 { USB_DEVICE(SEALEVEL_VID, SEALEVEL_2102_PID) },
342 { USB_DEVICE(SEALEVEL_VID, SEALEVEL_2103_PID) },
343 { USB_DEVICE(SEALEVEL_VID, SEALEVEL_2104_PID) },
344 { USB_DEVICE(SEALEVEL_VID, SEALEVEL_2201_1_PID) },
345 { USB_DEVICE(SEALEVEL_VID, SEALEVEL_2201_2_PID) },
346 { USB_DEVICE(SEALEVEL_VID, SEALEVEL_2202_1_PID) },
347 { USB_DEVICE(SEALEVEL_VID, SEALEVEL_2202_2_PID) },
348 { USB_DEVICE(SEALEVEL_VID, SEALEVEL_2203_1_PID) },
349 { USB_DEVICE(SEALEVEL_VID, SEALEVEL_2203_2_PID) },
350 { USB_DEVICE(SEALEVEL_VID, SEALEVEL_2401_1_PID) },
351 { USB_DEVICE(SEALEVEL_VID, SEALEVEL_2401_2_PID) },
352 { USB_DEVICE(SEALEVEL_VID, SEALEVEL_2401_3_PID) },
353 { USB_DEVICE(SEALEVEL_VID, SEALEVEL_2401_4_PID) },
354 { USB_DEVICE(SEALEVEL_VID, SEALEVEL_2402_1_PID) },
355 { USB_DEVICE(SEALEVEL_VID, SEALEVEL_2402_2_PID) },
356 { USB_DEVICE(SEALEVEL_VID, SEALEVEL_2402_3_PID) },
357 { USB_DEVICE(SEALEVEL_VID, SEALEVEL_2402_4_PID) },
358 { USB_DEVICE(SEALEVEL_VID, SEALEVEL_2403_1_PID) },
359 { USB_DEVICE(SEALEVEL_VID, SEALEVEL_2403_2_PID) },
360 { USB_DEVICE(SEALEVEL_VID, SEALEVEL_2403_3_PID) },
361 { USB_DEVICE(SEALEVEL_VID, SEALEVEL_2403_4_PID) },
362 { USB_DEVICE(SEALEVEL_VID, SEALEVEL_2801_1_PID) },
363 { USB_DEVICE(SEALEVEL_VID, SEALEVEL_2801_2_PID) },
364 { USB_DEVICE(SEALEVEL_VID, SEALEVEL_2801_3_PID) },
365 { USB_DEVICE(SEALEVEL_VID, SEALEVEL_2801_4_PID) },
366 { USB_DEVICE(SEALEVEL_VID, SEALEVEL_2801_5_PID) },
367 { USB_DEVICE(SEALEVEL_VID, SEALEVEL_2801_6_PID) },
368 { USB_DEVICE(SEALEVEL_VID, SEALEVEL_2801_7_PID) },
369 { USB_DEVICE(SEALEVEL_VID, SEALEVEL_2801_8_PID) },
370 { USB_DEVICE(SEALEVEL_VID, SEALEVEL_2802_1_PID) },
371 { USB_DEVICE(SEALEVEL_VID, SEALEVEL_2802_2_PID) },
372 { USB_DEVICE(SEALEVEL_VID, SEALEVEL_2802_3_PID) },
373 { USB_DEVICE(SEALEVEL_VID, SEALEVEL_2802_4_PID) },
374 { USB_DEVICE(SEALEVEL_VID, SEALEVEL_2802_5_PID) },
375 { USB_DEVICE(SEALEVEL_VID, SEALEVEL_2802_6_PID) },
376 { USB_DEVICE(SEALEVEL_VID, SEALEVEL_2802_7_PID) },
377 { USB_DEVICE(SEALEVEL_VID, SEALEVEL_2802_8_PID) },
378 { USB_DEVICE(SEALEVEL_VID, SEALEVEL_2803_1_PID) },
379 { USB_DEVICE(SEALEVEL_VID, SEALEVEL_2803_2_PID) },
380 { USB_DEVICE(SEALEVEL_VID, SEALEVEL_2803_3_PID) },
381 { USB_DEVICE(SEALEVEL_VID, SEALEVEL_2803_4_PID) },
382 { USB_DEVICE(SEALEVEL_VID, SEALEVEL_2803_5_PID) },
383 { USB_DEVICE(SEALEVEL_VID, SEALEVEL_2803_6_PID) },
384 { USB_DEVICE(SEALEVEL_VID, SEALEVEL_2803_7_PID) },
385 { USB_DEVICE(SEALEVEL_VID, SEALEVEL_2803_8_PID) },
386 { USB_DEVICE(IDTECH_VID, IDTECH_IDT1221U_PID) },
387 { USB_DEVICE(OCT_VID, OCT_US101_PID) },
388 { USB_DEVICE(FTDI_VID, FTDI_HE_TIRA1_PID),
389 .driver_info = (kernel_ulong_t)&ftdi_HE_TIRA1_quirk },
390 { USB_DEVICE(FTDI_VID, FTDI_USB_UIRT_PID),
391 .driver_info = (kernel_ulong_t)&ftdi_USB_UIRT_quirk },
392 { USB_DEVICE(FTDI_VID, PROTEGO_SPECIAL_1) },
393 { USB_DEVICE(FTDI_VID, PROTEGO_R2X0) },
394 { USB_DEVICE(FTDI_VID, PROTEGO_SPECIAL_3) },
395 { USB_DEVICE(FTDI_VID, PROTEGO_SPECIAL_4) },
396 { USB_DEVICE(FTDI_VID, FTDI_GUDEADS_E808_PID) },
397 { USB_DEVICE(FTDI_VID, FTDI_GUDEADS_E809_PID) },
398 { USB_DEVICE(FTDI_VID, FTDI_GUDEADS_E80A_PID) },
399 { USB_DEVICE(FTDI_VID, FTDI_GUDEADS_E80B_PID) },
400 { USB_DEVICE(FTDI_VID, FTDI_GUDEADS_E80C_PID) },
401 { USB_DEVICE(FTDI_VID, FTDI_GUDEADS_E80D_PID) },
402 { USB_DEVICE(FTDI_VID, FTDI_GUDEADS_E80E_PID) },
403 { USB_DEVICE(FTDI_VID, FTDI_GUDEADS_E80F_PID) },
404 { USB_DEVICE(FTDI_VID, FTDI_GUDEADS_E888_PID) },
405 { USB_DEVICE(FTDI_VID, FTDI_GUDEADS_E889_PID) },
406 { USB_DEVICE(FTDI_VID, FTDI_GUDEADS_E88A_PID) },
407 { USB_DEVICE(FTDI_VID, FTDI_GUDEADS_E88B_PID) },
408 { USB_DEVICE(FTDI_VID, FTDI_GUDEADS_E88C_PID) },
409 { USB_DEVICE(FTDI_VID, FTDI_GUDEADS_E88D_PID) },
410 { USB_DEVICE(FTDI_VID, FTDI_GUDEADS_E88E_PID) },
411 { USB_DEVICE(FTDI_VID, FTDI_GUDEADS_E88F_PID) },
412 { USB_DEVICE(FTDI_VID, FTDI_ELV_UO100_PID) },
413 { USB_DEVICE(FTDI_VID, FTDI_ELV_UM100_PID) },
414 { USB_DEVICE(FTDI_VID, FTDI_ELV_UR100_PID) },
415 { USB_DEVICE(FTDI_VID, FTDI_ELV_ALC8500_PID) },
416 { USB_DEVICE(FTDI_VID, FTDI_PYRAMID_PID) },
417 { USB_DEVICE(FTDI_VID, FTDI_ELV_FHZ1000PC_PID) },
418 /*
419 * These will probably use user-space drivers. Uncomment them if
420 * you need them or use the user-specified vendor/product module
421 * parameters (see ftdi_sio.h for the numbers). Make a fuss if
422 * you think the driver should recognize any of them by default.
423 */
424 /* { USB_DEVICE(FTDI_VID, FTDI_ELV_CLI7000_PID) }, */
425 /* { USB_DEVICE(FTDI_VID, FTDI_ELV_PPS7330_PID) }, */
426 /* { USB_DEVICE(FTDI_VID, FTDI_ELV_TFM100_PID) }, */
427 /* { USB_DEVICE(FTDI_VID, FTDI_ELV_UDF77_PID) }, */
428 /* { USB_DEVICE(FTDI_VID, FTDI_ELV_UIO88_PID) }, */
429 /* { USB_DEVICE(FTDI_VID, FTDI_ELV_UAD8_PID) }, */
430 /* { USB_DEVICE(FTDI_VID, FTDI_ELV_UDA7_PID) }, */
431 /* { USB_DEVICE(FTDI_VID, FTDI_ELV_USI2_PID) }, */
432 /* { USB_DEVICE(FTDI_VID, FTDI_ELV_T1100_PID) }, */
433 /* { USB_DEVICE(FTDI_VID, FTDI_ELV_PCD200_PID) }, */
434 /* { USB_DEVICE(FTDI_VID, FTDI_ELV_ULA200_PID) }, */
435 /* { USB_DEVICE(FTDI_VID, FTDI_ELV_CSI8_PID) }, */
436 /* { USB_DEVICE(FTDI_VID, FTDI_ELV_EM1000DL_PID) }, */
437 /* { USB_DEVICE(FTDI_VID, FTDI_ELV_PCK100_PID) }, */
438 /* { USB_DEVICE(FTDI_VID, FTDI_ELV_RFP500_PID) }, */
439 /* { USB_DEVICE(FTDI_VID, FTDI_ELV_FS20SIG_PID) }, */
440 /* { USB_DEVICE(FTDI_VID, FTDI_ELV_WS300PC_PID) }, */
441 /* { USB_DEVICE(FTDI_VID, FTDI_ELV_FHZ1300PC_PID) }, */
442 /* { USB_DEVICE(FTDI_VID, FTDI_ELV_WS500_PID) }, */
443 { USB_DEVICE(FTDI_VID, LINX_SDMUSBQSS_PID) },
444 { USB_DEVICE(FTDI_VID, LINX_MASTERDEVEL2_PID) },
445 { USB_DEVICE(FTDI_VID, LINX_FUTURE_0_PID) },
446 { USB_DEVICE(FTDI_VID, LINX_FUTURE_1_PID) },
447 { USB_DEVICE(FTDI_VID, LINX_FUTURE_2_PID) },
448 { USB_DEVICE(FTDI_VID, FTDI_CCSICDU20_0_PID) },
449 { USB_DEVICE(FTDI_VID, FTDI_CCSICDU40_1_PID) },
450 { USB_DEVICE(FTDI_VID, INSIDE_ACCESSO) },
451 { USB_DEVICE(INTREPID_VID, INTREPID_VALUECAN_PID) },
452 { USB_DEVICE(INTREPID_VID, INTREPID_NEOVI_PID) },
453 { USB_DEVICE(FALCOM_VID, FALCOM_TWIST_PID) },
454 { USB_DEVICE(FALCOM_VID, FALCOM_SAMBA_PID) },
455 { USB_DEVICE(FTDI_VID, FTDI_SUUNTO_SPORTS_PID) },
456 { USB_DEVICE(FTDI_VID, FTDI_RM_CANVIEW_PID) },
457 { USB_DEVICE(BANDB_VID, BANDB_USOTL4_PID) },
458 { USB_DEVICE(BANDB_VID, BANDB_USTL4_PID) },
459 { USB_DEVICE(BANDB_VID, BANDB_USO9ML2_PID) },
460 { USB_DEVICE(FTDI_VID, EVER_ECO_PRO_CDS) },
461 { USB_DEVICE(FTDI_VID, FTDI_4N_GALAXY_DE_0_PID) },
462 { USB_DEVICE(FTDI_VID, FTDI_4N_GALAXY_DE_1_PID) },
463 { USB_DEVICE(FTDI_VID, FTDI_4N_GALAXY_DE_2_PID) },
464 { USB_DEVICE(FTDI_VID, XSENS_CONVERTER_0_PID) },
465 { USB_DEVICE(FTDI_VID, XSENS_CONVERTER_1_PID) },
466 { USB_DEVICE(FTDI_VID, XSENS_CONVERTER_2_PID) },
467 { USB_DEVICE(FTDI_VID, XSENS_CONVERTER_3_PID) },
468 { USB_DEVICE(FTDI_VID, XSENS_CONVERTER_4_PID) },
469 { USB_DEVICE(FTDI_VID, XSENS_CONVERTER_5_PID) },
470 { USB_DEVICE(FTDI_VID, XSENS_CONVERTER_6_PID) },
471 { USB_DEVICE(FTDI_VID, XSENS_CONVERTER_7_PID) },
472 { USB_DEVICE(MOBILITY_VID, MOBILITY_USB_SERIAL_PID) },
473 { USB_DEVICE(FTDI_VID, FTDI_ACTIVE_ROBOTS_PID) },
474 { USB_DEVICE(FTDI_VID, FTDI_MHAM_KW_PID) },
475 { USB_DEVICE(FTDI_VID, FTDI_MHAM_YS_PID) },
476 { USB_DEVICE(FTDI_VID, FTDI_MHAM_Y6_PID) },
477 { USB_DEVICE(FTDI_VID, FTDI_MHAM_Y8_PID) },
478 { USB_DEVICE(FTDI_VID, FTDI_MHAM_IC_PID) },
479 { USB_DEVICE(FTDI_VID, FTDI_MHAM_DB9_PID) },
480 { USB_DEVICE(FTDI_VID, FTDI_MHAM_RS232_PID) },
481 { USB_DEVICE(FTDI_VID, FTDI_MHAM_Y9_PID) },
482 { USB_DEVICE(FTDI_VID, FTDI_TERATRONIK_VCP_PID) },
483 { USB_DEVICE(FTDI_VID, FTDI_TERATRONIK_D2XX_PID) },
484 { USB_DEVICE(EVOLUTION_VID, EVOLUTION_ER1_PID) },
485 { USB_DEVICE(FTDI_VID, FTDI_ARTEMIS_PID) },
486 { USB_DEVICE(FTDI_VID, FTDI_ATIK_ATK16_PID) },
487 { USB_DEVICE(FTDI_VID, FTDI_ATIK_ATK16C_PID) },
488 { USB_DEVICE(FTDI_VID, FTDI_ATIK_ATK16HR_PID) },
489 { USB_DEVICE(FTDI_VID, FTDI_ATIK_ATK16HRC_PID) },
490 { USB_DEVICE(KOBIL_VID, KOBIL_CONV_B1_PID) },
491 { USB_DEVICE(KOBIL_VID, KOBIL_CONV_KAAN_PID) },
492 { USB_DEVICE(POSIFLEX_VID, POSIFLEX_PP7000_PID) },
493 { USB_DEVICE(FTDI_VID, FTDI_TTUSB_PID) },
494 { USB_DEVICE(FTDI_VID, FTDI_ECLO_COM_1WIRE_PID) },
495 { USB_DEVICE(FTDI_VID, FTDI_WESTREX_MODEL_777_PID) },
496 { USB_DEVICE(FTDI_VID, FTDI_WESTREX_MODEL_8900F_PID) },
497 { USB_DEVICE(FTDI_VID, FTDI_PCDJ_DAC2_PID) },
498 { USB_DEVICE(FTDI_VID, FTDI_RRCIRKITS_LOCOBUFFER_PID) },
499 { USB_DEVICE(FTDI_VID, FTDI_ASK_RDR400_PID) },
500 { USB_DEVICE(ICOM_ID1_VID, ICOM_ID1_PID) },
501 { USB_DEVICE(PAPOUCH_VID, PAPOUCH_TMU_PID) },
502 { USB_DEVICE(FTDI_VID, FTDI_ACG_HFDUAL_PID) },
503 { USB_DEVICE(FTDI_VID, FTDI_YEI_SERVOCENTER31_PID) },
504 { USB_DEVICE(FTDI_VID, FTDI_THORLABS_PID) },
505 { USB_DEVICE(TESTO_VID, TESTO_USB_INTERFACE_PID) },
506 { }, /* Optional parameter entry */
507 { } /* Terminating entry */
508 };
509
510 MODULE_DEVICE_TABLE (usb, id_table_combined);
511
512 static struct usb_driver ftdi_driver = {
513 .name = "ftdi_sio",
514 .probe = usb_serial_probe,
515 .disconnect = usb_serial_disconnect,
516 .id_table = id_table_combined,
517 .no_dynamic_id = 1,
518 };
519
520 static const char *ftdi_chip_name[] = {
521 [SIO] = "SIO", /* the serial part of FT8U100AX */
522 [FT8U232AM] = "FT8U232AM",
523 [FT232BM] = "FT232BM",
524 [FT2232C] = "FT2232C",
525 };
526
527
528 /* Constants for read urb and write urb */
529 #define BUFSZ 512
530 #define PKTSZ 64
531
532 /* rx_flags */
533 #define THROTTLED 0x01
534 #define ACTUALLY_THROTTLED 0x02
535
536 struct ftdi_private {
537 ftdi_chip_type_t chip_type;
538 /* type of the device, either SIO or FT8U232AM */
539 int baud_base; /* baud base clock for divisor setting */
540 int custom_divisor; /* custom_divisor kludge, this is for baud_base (different from what goes to the chip!) */
541 __u16 last_set_data_urb_value ;
542 /* the last data state set - needed for doing a break */
543 int write_offset; /* This is the offset in the usb data block to write the serial data -
544 * it is different between devices
545 */
546 int flags; /* some ASYNC_xxxx flags are supported */
547 unsigned long last_dtr_rts; /* saved modem control outputs */
548 wait_queue_head_t delta_msr_wait; /* Used for TIOCMIWAIT */
549 char prev_status, diff_status; /* Used for TIOCMIWAIT */
550 __u8 rx_flags; /* receive state flags (throttling) */
551 spinlock_t rx_lock; /* spinlock for receive state */
552 struct work_struct rx_work;
553 int rx_processed;
554 unsigned long rx_bytes;
555
556 __u16 interface; /* FT2232C port interface (0 for FT232/245) */
557
558 int force_baud; /* if non-zero, force the baud rate to this value */
559 int force_rtscts; /* if non-zero, force RTS-CTS to always be enabled */
560
561 spinlock_t tx_lock; /* spinlock for transmit state */
562 unsigned long tx_bytes;
563 unsigned long tx_outstanding_bytes;
564 unsigned long tx_outstanding_urbs;
565 };
566
567 /* Used for TIOCMIWAIT */
568 #define FTDI_STATUS_B0_MASK (FTDI_RS0_CTS | FTDI_RS0_DSR | FTDI_RS0_RI | FTDI_RS0_RLSD)
569 #define FTDI_STATUS_B1_MASK (FTDI_RS_BI)
570 /* End TIOCMIWAIT */
571
572 #define FTDI_IMPL_ASYNC_FLAGS = ( ASYNC_SPD_HI | ASYNC_SPD_VHI \
573 ASYNC_SPD_CUST | ASYNC_SPD_SHI | ASYNC_SPD_WARP )
574
575 /* function prototypes for a FTDI serial converter */
576 static int ftdi_sio_probe (struct usb_serial *serial, const struct usb_device_id *id);
577 static int ftdi_sio_attach (struct usb_serial *serial);
578 static void ftdi_shutdown (struct usb_serial *serial);
579 static int ftdi_open (struct usb_serial_port *port, struct file *filp);
580 static void ftdi_close (struct usb_serial_port *port, struct file *filp);
581 static int ftdi_write (struct usb_serial_port *port, const unsigned char *buf, int count);
582 static int ftdi_write_room (struct usb_serial_port *port);
583 static int ftdi_chars_in_buffer (struct usb_serial_port *port);
584 static void ftdi_write_bulk_callback (struct urb *urb, struct pt_regs *regs);
585 static void ftdi_read_bulk_callback (struct urb *urb, struct pt_regs *regs);
586 static void ftdi_process_read (void *param);
587 static void ftdi_set_termios (struct usb_serial_port *port, struct termios * old);
588 static int ftdi_tiocmget (struct usb_serial_port *port, struct file *file);
589 static int ftdi_tiocmset (struct usb_serial_port *port, struct file * file, unsigned int set, unsigned int clear);
590 static int ftdi_ioctl (struct usb_serial_port *port, struct file * file, unsigned int cmd, unsigned long arg);
591 static void ftdi_break_ctl (struct usb_serial_port *port, int break_state );
592 static void ftdi_throttle (struct usb_serial_port *port);
593 static void ftdi_unthrottle (struct usb_serial_port *port);
594
595 static unsigned short int ftdi_232am_baud_base_to_divisor (int baud, int base);
596 static unsigned short int ftdi_232am_baud_to_divisor (int baud);
597 static __u32 ftdi_232bm_baud_base_to_divisor (int baud, int base);
598 static __u32 ftdi_232bm_baud_to_divisor (int baud);
599
600 static struct usb_serial_driver ftdi_sio_device = {
601 .driver = {
602 .owner = THIS_MODULE,
603 .name = "ftdi_sio",
604 },
605 .description = "FTDI USB Serial Device",
606 .id_table = id_table_combined,
607 .num_interrupt_in = 0,
608 .num_bulk_in = 1,
609 .num_bulk_out = 1,
610 .num_ports = 1,
611 .probe = ftdi_sio_probe,
612 .open = ftdi_open,
613 .close = ftdi_close,
614 .throttle = ftdi_throttle,
615 .unthrottle = ftdi_unthrottle,
616 .write = ftdi_write,
617 .write_room = ftdi_write_room,
618 .chars_in_buffer = ftdi_chars_in_buffer,
619 .read_bulk_callback = ftdi_read_bulk_callback,
620 .write_bulk_callback = ftdi_write_bulk_callback,
621 .tiocmget = ftdi_tiocmget,
622 .tiocmset = ftdi_tiocmset,
623 .ioctl = ftdi_ioctl,
624 .set_termios = ftdi_set_termios,
625 .break_ctl = ftdi_break_ctl,
626 .attach = ftdi_sio_attach,
627 .shutdown = ftdi_shutdown,
628 };
629
630
631 #define WDR_TIMEOUT 5000 /* default urb timeout */
632 #define WDR_SHORT_TIMEOUT 1000 /* shorter urb timeout */
633
634 /* High and low are for DTR, RTS etc etc */
635 #define HIGH 1
636 #define LOW 0
637
638 /* number of outstanding urbs to prevent userspace DoS from happening */
639 #define URB_UPPER_LIMIT 42
640
641 /*
642 * ***************************************************************************
643 * Utlity functions
644 * ***************************************************************************
645 */
646
647 static unsigned short int ftdi_232am_baud_base_to_divisor(int baud, int base)
648 {
649 unsigned short int divisor;
650 int divisor3 = base / 2 / baud; // divisor shifted 3 bits to the left
651 if ((divisor3 & 0x7) == 7) divisor3 ++; // round x.7/8 up to x+1
652 divisor = divisor3 >> 3;
653 divisor3 &= 0x7;
654 if (divisor3 == 1) divisor |= 0xc000; else // 0.125
655 if (divisor3 >= 4) divisor |= 0x4000; else // 0.5
656 if (divisor3 != 0) divisor |= 0x8000; // 0.25
657 if (divisor == 1) divisor = 0; /* special case for maximum baud rate */
658 return divisor;
659 }
660
661 static unsigned short int ftdi_232am_baud_to_divisor(int baud)
662 {
663 return(ftdi_232am_baud_base_to_divisor(baud, 48000000));
664 }
665
666 static __u32 ftdi_232bm_baud_base_to_divisor(int baud, int base)
667 {
668 static const unsigned char divfrac[8] = { 0, 3, 2, 4, 1, 5, 6, 7 };
669 __u32 divisor;
670 int divisor3 = base / 2 / baud; // divisor shifted 3 bits to the left
671 divisor = divisor3 >> 3;
672 divisor |= (__u32)divfrac[divisor3 & 0x7] << 14;
673 /* Deal with special cases for highest baud rates. */
674 if (divisor == 1) divisor = 0; else // 1.0
675 if (divisor == 0x4001) divisor = 1; // 1.5
676 return divisor;
677 }
678
679 static __u32 ftdi_232bm_baud_to_divisor(int baud)
680 {
681 return(ftdi_232bm_baud_base_to_divisor(baud, 48000000));
682 }
683
684 #define set_mctrl(port, set) update_mctrl((port), (set), 0)
685 #define clear_mctrl(port, clear) update_mctrl((port), 0, (clear))
686
687 static int update_mctrl(struct usb_serial_port *port, unsigned int set, unsigned int clear)
688 {
689 struct ftdi_private *priv = usb_get_serial_port_data(port);
690 char *buf;
691 unsigned urb_value;
692 int rv;
693
694 if (((set | clear) & (TIOCM_DTR | TIOCM_RTS)) == 0) {
695 dbg("%s - DTR|RTS not being set|cleared", __FUNCTION__);
696 return 0; /* no change */
697 }
698
699 buf = kmalloc(1, GFP_NOIO);
700 if (!buf) {
701 return -ENOMEM;
702 }
703
704 clear &= ~set; /* 'set' takes precedence over 'clear' */
705 urb_value = 0;
706 if (clear & TIOCM_DTR)
707 urb_value |= FTDI_SIO_SET_DTR_LOW;
708 if (clear & TIOCM_RTS)
709 urb_value |= FTDI_SIO_SET_RTS_LOW;
710 if (set & TIOCM_DTR)
711 urb_value |= FTDI_SIO_SET_DTR_HIGH;
712 if (set & TIOCM_RTS)
713 urb_value |= FTDI_SIO_SET_RTS_HIGH;
714 rv = usb_control_msg(port->serial->dev,
715 usb_sndctrlpipe(port->serial->dev, 0),
716 FTDI_SIO_SET_MODEM_CTRL_REQUEST,
717 FTDI_SIO_SET_MODEM_CTRL_REQUEST_TYPE,
718 urb_value, priv->interface,
719 buf, 0, WDR_TIMEOUT);
720
721 kfree(buf);
722 if (rv < 0) {
723 err("%s Error from MODEM_CTRL urb: DTR %s, RTS %s",
724 __FUNCTION__,
725 (set & TIOCM_DTR) ? "HIGH" :
726 (clear & TIOCM_DTR) ? "LOW" : "unchanged",
727 (set & TIOCM_RTS) ? "HIGH" :
728 (clear & TIOCM_RTS) ? "LOW" : "unchanged");
729 } else {
730 dbg("%s - DTR %s, RTS %s", __FUNCTION__,
731 (set & TIOCM_DTR) ? "HIGH" :
732 (clear & TIOCM_DTR) ? "LOW" : "unchanged",
733 (set & TIOCM_RTS) ? "HIGH" :
734 (clear & TIOCM_RTS) ? "LOW" : "unchanged");
735 priv->last_dtr_rts = (priv->last_dtr_rts & ~clear) | set;
736 }
737 return rv;
738 }
739
740
741 static __u32 get_ftdi_divisor(struct usb_serial_port * port);
742
743
744 static int change_speed(struct usb_serial_port *port)
745 {
746 struct ftdi_private *priv = usb_get_serial_port_data(port);
747 char *buf;
748 __u16 urb_value;
749 __u16 urb_index;
750 __u32 urb_index_value;
751 int rv;
752
753 buf = kmalloc(1, GFP_NOIO);
754 if (!buf)
755 return -ENOMEM;
756
757 urb_index_value = get_ftdi_divisor(port);
758 urb_value = (__u16)urb_index_value;
759 urb_index = (__u16)(urb_index_value >> 16);
760 if (priv->interface) { /* FT2232C */
761 urb_index = (__u16)((urb_index << 8) | priv->interface);
762 }
763
764 rv = usb_control_msg(port->serial->dev,
765 usb_sndctrlpipe(port->serial->dev, 0),
766 FTDI_SIO_SET_BAUDRATE_REQUEST,
767 FTDI_SIO_SET_BAUDRATE_REQUEST_TYPE,
768 urb_value, urb_index,
769 buf, 0, WDR_SHORT_TIMEOUT);
770
771 kfree(buf);
772 return rv;
773 }
774
775
776 static __u32 get_ftdi_divisor(struct usb_serial_port * port)
777 { /* get_ftdi_divisor */
778 struct ftdi_private *priv = usb_get_serial_port_data(port);
779 __u32 div_value = 0;
780 int div_okay = 1;
781 int baud;
782
783 /*
784 * The logic involved in setting the baudrate can be cleanly split in 3 steps.
785 * Obtaining the actual baud rate is a little tricky since unix traditionally
786 * somehow ignored the possibility to set non-standard baud rates.
787 * 1. Standard baud rates are set in tty->termios->c_cflag
788 * 2. If these are not enough, you can set any speed using alt_speed as follows:
789 * - set tty->termios->c_cflag speed to B38400
790 * - set your real speed in tty->alt_speed; it gets ignored when
791 * alt_speed==0, (or)
792 * - call TIOCSSERIAL ioctl with (struct serial_struct) set as follows:
793 * flags & ASYNC_SPD_MASK == ASYNC_SPD_[HI, VHI, SHI, WARP], this just
794 * sets alt_speed to (HI: 57600, VHI: 115200, SHI: 230400, WARP: 460800)
795 * ** Steps 1, 2 are done courtesy of tty_get_baud_rate
796 * 3. You can also set baud rate by setting custom divisor as follows
797 * - set tty->termios->c_cflag speed to B38400
798 * - call TIOCSSERIAL ioctl with (struct serial_struct) set as follows:
799 * o flags & ASYNC_SPD_MASK == ASYNC_SPD_CUST
800 * o custom_divisor set to baud_base / your_new_baudrate
801 * ** Step 3 is done courtesy of code borrowed from serial.c - I should really
802 * spend some time and separate+move this common code to serial.c, it is
803 * replicated in nearly every serial driver you see.
804 */
805
806 /* 1. Get the baud rate from the tty settings, this observes alt_speed hack */
807
808 baud = tty_get_baud_rate(port->tty);
809 dbg("%s - tty_get_baud_rate reports speed %d", __FUNCTION__, baud);
810
811 /* 2. Observe async-compatible custom_divisor hack, update baudrate if needed */
812
813 if (baud == 38400 &&
814 ((priv->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST) &&
815 (priv->custom_divisor)) {
816 baud = priv->baud_base / priv->custom_divisor;
817 dbg("%s - custom divisor %d sets baud rate to %d", __FUNCTION__, priv->custom_divisor, baud);
818 }
819
820 /* 3. Convert baudrate to device-specific divisor */
821
822 if (!baud) baud = 9600;
823 switch(priv->chip_type) {
824 case SIO: /* SIO chip */
825 switch(baud) {
826 case 300: div_value = ftdi_sio_b300; break;
827 case 600: div_value = ftdi_sio_b600; break;
828 case 1200: div_value = ftdi_sio_b1200; break;
829 case 2400: div_value = ftdi_sio_b2400; break;
830 case 4800: div_value = ftdi_sio_b4800; break;
831 case 9600: div_value = ftdi_sio_b9600; break;
832 case 19200: div_value = ftdi_sio_b19200; break;
833 case 38400: div_value = ftdi_sio_b38400; break;
834 case 57600: div_value = ftdi_sio_b57600; break;
835 case 115200: div_value = ftdi_sio_b115200; break;
836 } /* baud */
837 if (div_value == 0) {
838 dbg("%s - Baudrate (%d) requested is not supported", __FUNCTION__, baud);
839 div_value = ftdi_sio_b9600;
840 div_okay = 0;
841 }
842 break;
843 case FT8U232AM: /* 8U232AM chip */
844 if (baud <= 3000000) {
845 div_value = ftdi_232am_baud_to_divisor(baud);
846 } else {
847 dbg("%s - Baud rate too high!", __FUNCTION__);
848 div_value = ftdi_232am_baud_to_divisor(9600);
849 div_okay = 0;
850 }
851 break;
852 case FT232BM: /* FT232BM chip */
853 case FT2232C: /* FT2232C chip */
854 if (baud <= 3000000) {
855 div_value = ftdi_232bm_baud_to_divisor(baud);
856 } else {
857 dbg("%s - Baud rate too high!", __FUNCTION__);
858 div_value = ftdi_232bm_baud_to_divisor(9600);
859 div_okay = 0;
860 }
861 break;
862 } /* priv->chip_type */
863
864 if (div_okay) {
865 dbg("%s - Baud rate set to %d (divisor 0x%lX) on chip %s",
866 __FUNCTION__, baud, (unsigned long)div_value,
867 ftdi_chip_name[priv->chip_type]);
868 }
869
870 return(div_value);
871 }
872
873
874 static int get_serial_info(struct usb_serial_port * port, struct serial_struct __user * retinfo)
875 {
876 struct ftdi_private *priv = usb_get_serial_port_data(port);
877 struct serial_struct tmp;
878
879 if (!retinfo)
880 return -EFAULT;
881 memset(&tmp, 0, sizeof(tmp));
882 tmp.flags = priv->flags;
883 tmp.baud_base = priv->baud_base;
884 tmp.custom_divisor = priv->custom_divisor;
885 if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
886 return -EFAULT;
887 return 0;
888 } /* get_serial_info */
889
890
891 static int set_serial_info(struct usb_serial_port * port, struct serial_struct __user * newinfo)
892 { /* set_serial_info */
893 struct ftdi_private *priv = usb_get_serial_port_data(port);
894 struct serial_struct new_serial;
895 struct ftdi_private old_priv;
896
897 if (copy_from_user(&new_serial, newinfo, sizeof(new_serial)))
898 return -EFAULT;
899 old_priv = * priv;
900
901 /* Do error checking and permission checking */
902
903 if (!capable(CAP_SYS_ADMIN)) {
904 if (((new_serial.flags & ~ASYNC_USR_MASK) !=
905 (priv->flags & ~ASYNC_USR_MASK)))
906 return -EPERM;
907 priv->flags = ((priv->flags & ~ASYNC_USR_MASK) |
908 (new_serial.flags & ASYNC_USR_MASK));
909 priv->custom_divisor = new_serial.custom_divisor;
910 goto check_and_exit;
911 }
912
913 if ((new_serial.baud_base != priv->baud_base) &&
914 (new_serial.baud_base < 9600))
915 return -EINVAL;
916
917 /* Make the changes - these are privileged changes! */
918
919 priv->flags = ((priv->flags & ~ASYNC_FLAGS) |
920 (new_serial.flags & ASYNC_FLAGS));
921 priv->custom_divisor = new_serial.custom_divisor;
922
923 port->tty->low_latency = (priv->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
924
925 check_and_exit:
926 if ((old_priv.flags & ASYNC_SPD_MASK) !=
927 (priv->flags & ASYNC_SPD_MASK)) {
928 if ((priv->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
929 port->tty->alt_speed = 57600;
930 else if ((priv->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
931 port->tty->alt_speed = 115200;
932 else if ((priv->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI)
933 port->tty->alt_speed = 230400;
934 else if ((priv->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP)
935 port->tty->alt_speed = 460800;
936 else
937 port->tty->alt_speed = 0;
938 }
939 if (((old_priv.flags & ASYNC_SPD_MASK) !=
940 (priv->flags & ASYNC_SPD_MASK)) ||
941 (((priv->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST) &&
942 (old_priv.custom_divisor != priv->custom_divisor))) {
943 change_speed(port);
944 }
945
946 return (0);
947
948 } /* set_serial_info */
949
950
951 /* Determine type of FTDI chip based on USB config and descriptor. */
952 static void ftdi_determine_type(struct usb_serial_port *port)
953 {
954 struct ftdi_private *priv = usb_get_serial_port_data(port);
955 struct usb_serial *serial = port->serial;
956 struct usb_device *udev = serial->dev;
957 unsigned version;
958 unsigned interfaces;
959
960 /* Assume it is not the original SIO device for now. */
961 priv->baud_base = 48000000 / 2;
962 priv->write_offset = 0;
963
964 version = le16_to_cpu(udev->descriptor.bcdDevice);
965 interfaces = udev->actconfig->desc.bNumInterfaces;
966 dbg("%s: bcdDevice = 0x%x, bNumInterfaces = %u", __FUNCTION__,
967 version, interfaces);
968 if (interfaces > 1) {
969 int inter;
970
971 /* Multiple interfaces. Assume FT2232C. */
972 priv->chip_type = FT2232C;
973 /* Determine interface code. */
974 inter = serial->interface->altsetting->desc.bInterfaceNumber;
975 if (inter == 0) {
976 priv->interface = PIT_SIOA;
977 } else {
978 priv->interface = PIT_SIOB;
979 }
980 /* BM-type devices have a bug where bcdDevice gets set
981 * to 0x200 when iSerialNumber is 0. */
982 if (version < 0x500) {
983 dbg("%s: something fishy - bcdDevice too low for multi-interface device",
984 __FUNCTION__);
985 }
986 } else if (version < 0x200) {
987 /* Old device. Assume its the original SIO. */
988 priv->chip_type = SIO;
989 priv->baud_base = 12000000 / 16;
990 priv->write_offset = 1;
991 } else if (version < 0x400) {
992 /* Assume its an FT8U232AM (or FT8U245AM) */
993 /* (It might be a BM because of the iSerialNumber bug,
994 * but it will still work as an AM device.) */
995 priv->chip_type = FT8U232AM;
996 } else {
997 /* Assume its an FT232BM (or FT245BM) */
998 priv->chip_type = FT232BM;
999 }
1000 info("Detected %s", ftdi_chip_name[priv->chip_type]);
1001 }
1002
1003
1004 /*
1005 * ***************************************************************************
1006 * Sysfs Attribute
1007 * ***************************************************************************
1008 */
1009
1010 static ssize_t show_latency_timer(struct device *dev, struct device_attribute *attr, char *buf)
1011 {
1012 struct usb_serial_port *port = to_usb_serial_port(dev);
1013 struct ftdi_private *priv = usb_get_serial_port_data(port);
1014 struct usb_device *udev;
1015 unsigned short latency = 0;
1016 int rv = 0;
1017
1018 udev = to_usb_device(dev);
1019
1020 dbg("%s",__FUNCTION__);
1021
1022 rv = usb_control_msg(udev,
1023 usb_rcvctrlpipe(udev, 0),
1024 FTDI_SIO_GET_LATENCY_TIMER_REQUEST,
1025 FTDI_SIO_GET_LATENCY_TIMER_REQUEST_TYPE,
1026 0, priv->interface,
1027 (char*) &latency, 1, WDR_TIMEOUT);
1028
1029 if (rv < 0) {
1030 dev_err(dev, "Unable to read latency timer: %i", rv);
1031 return -EIO;
1032 }
1033 return sprintf(buf, "%i\n", latency);
1034 }
1035
1036 /* Write a new value of the latency timer, in units of milliseconds. */
1037 static ssize_t store_latency_timer(struct device *dev, struct device_attribute *attr, const char *valbuf,
1038 size_t count)
1039 {
1040 struct usb_serial_port *port = to_usb_serial_port(dev);
1041 struct ftdi_private *priv = usb_get_serial_port_data(port);
1042 struct usb_device *udev;
1043 char buf[1];
1044 int v = simple_strtoul(valbuf, NULL, 10);
1045 int rv = 0;
1046
1047 udev = to_usb_device(dev);
1048
1049 dbg("%s: setting latency timer = %i", __FUNCTION__, v);
1050
1051 rv = usb_control_msg(udev,
1052 usb_sndctrlpipe(udev, 0),
1053 FTDI_SIO_SET_LATENCY_TIMER_REQUEST,
1054 FTDI_SIO_SET_LATENCY_TIMER_REQUEST_TYPE,
1055 v, priv->interface,
1056 buf, 0, WDR_TIMEOUT);
1057
1058 if (rv < 0) {
1059 dev_err(dev, "Unable to write latency timer: %i", rv);
1060 return -EIO;
1061 }
1062
1063 return count;
1064 }
1065
1066 /* Write an event character directly to the FTDI register. The ASCII
1067 value is in the low 8 bits, with the enable bit in the 9th bit. */
1068 static ssize_t store_event_char(struct device *dev, struct device_attribute *attr, const char *valbuf,
1069 size_t count)
1070 {
1071 struct usb_serial_port *port = to_usb_serial_port(dev);
1072 struct ftdi_private *priv = usb_get_serial_port_data(port);
1073 struct usb_device *udev;
1074 char buf[1];
1075 int v = simple_strtoul(valbuf, NULL, 10);
1076 int rv = 0;
1077
1078 udev = to_usb_device(dev);
1079
1080 dbg("%s: setting event char = %i", __FUNCTION__, v);
1081
1082 rv = usb_control_msg(udev,
1083 usb_sndctrlpipe(udev, 0),
1084 FTDI_SIO_SET_EVENT_CHAR_REQUEST,
1085 FTDI_SIO_SET_EVENT_CHAR_REQUEST_TYPE,
1086 v, priv->interface,
1087 buf, 0, WDR_TIMEOUT);
1088
1089 if (rv < 0) {
1090 dbg("Unable to write event character: %i", rv);
1091 return -EIO;
1092 }
1093
1094 return count;
1095 }
1096
1097 static DEVICE_ATTR(latency_timer, S_IWUSR | S_IRUGO, show_latency_timer, store_latency_timer);
1098 static DEVICE_ATTR(event_char, S_IWUSR, NULL, store_event_char);
1099
1100 static void create_sysfs_attrs(struct usb_serial *serial)
1101 {
1102 struct ftdi_private *priv;
1103 struct usb_device *udev;
1104
1105 dbg("%s",__FUNCTION__);
1106
1107 priv = usb_get_serial_port_data(serial->port[0]);
1108 udev = serial->dev;
1109
1110 /* XXX I've no idea if the original SIO supports the event_char
1111 * sysfs parameter, so I'm playing it safe. */
1112 if (priv->chip_type != SIO) {
1113 dbg("sysfs attributes for %s", ftdi_chip_name[priv->chip_type]);
1114 device_create_file(&udev->dev, &dev_attr_event_char);
1115 if (priv->chip_type == FT232BM || priv->chip_type == FT2232C) {
1116 device_create_file(&udev->dev, &dev_attr_latency_timer);
1117 }
1118 }
1119 }
1120
1121 static void remove_sysfs_attrs(struct usb_serial *serial)
1122 {
1123 struct ftdi_private *priv;
1124 struct usb_device *udev;
1125
1126 dbg("%s",__FUNCTION__);
1127
1128 priv = usb_get_serial_port_data(serial->port[0]);
1129 udev = serial->dev;
1130
1131 /* XXX see create_sysfs_attrs */
1132 if (priv->chip_type != SIO) {
1133 device_remove_file(&udev->dev, &dev_attr_event_char);
1134 if (priv->chip_type == FT232BM || priv->chip_type == FT2232C) {
1135 device_remove_file(&udev->dev, &dev_attr_latency_timer);
1136 }
1137 }
1138
1139 }
1140
1141 /*
1142 * ***************************************************************************
1143 * FTDI driver specific functions
1144 * ***************************************************************************
1145 */
1146
1147 /* Probe function to check for special devices */
1148 static int ftdi_sio_probe (struct usb_serial *serial, const struct usb_device_id *id)
1149 {
1150 usb_set_serial_data(serial, (void *)id->driver_info);
1151
1152 return (0);
1153 }
1154
1155 /* attach subroutine */
1156 static int ftdi_sio_attach (struct usb_serial *serial)
1157 {
1158 struct usb_serial_port *port = serial->port[0];
1159 struct ftdi_private *priv;
1160 struct ftdi_sio_quirk *quirk;
1161
1162 dbg("%s",__FUNCTION__);
1163
1164 priv = kzalloc(sizeof(struct ftdi_private), GFP_KERNEL);
1165 if (!priv){
1166 err("%s- kmalloc(%Zd) failed.", __FUNCTION__, sizeof(struct ftdi_private));
1167 return -ENOMEM;
1168 }
1169
1170 spin_lock_init(&priv->rx_lock);
1171 spin_lock_init(&priv->tx_lock);
1172 init_waitqueue_head(&priv->delta_msr_wait);
1173 /* This will push the characters through immediately rather
1174 than queue a task to deliver them */
1175 priv->flags = ASYNC_LOW_LATENCY;
1176
1177 /* Increase the size of read buffers */
1178 kfree(port->bulk_in_buffer);
1179 port->bulk_in_buffer = kmalloc (BUFSZ, GFP_KERNEL);
1180 if (!port->bulk_in_buffer) {
1181 kfree (priv);
1182 return -ENOMEM;
1183 }
1184 if (port->read_urb) {
1185 port->read_urb->transfer_buffer = port->bulk_in_buffer;
1186 port->read_urb->transfer_buffer_length = BUFSZ;
1187 }
1188
1189 INIT_WORK(&priv->rx_work, ftdi_process_read, port);
1190
1191 /* Free port's existing write urb and transfer buffer. */
1192 if (port->write_urb) {
1193 usb_free_urb (port->write_urb);
1194 port->write_urb = NULL;
1195 }
1196 kfree(port->bulk_out_buffer);
1197 port->bulk_out_buffer = NULL;
1198
1199 usb_set_serial_port_data(serial->port[0], priv);
1200
1201 ftdi_determine_type (serial->port[0]);
1202 create_sysfs_attrs(serial);
1203
1204 /* Check for device requiring special set up. */
1205 quirk = (struct ftdi_sio_quirk *)usb_get_serial_data(serial);
1206 if (quirk && quirk->setup) {
1207 quirk->setup(serial);
1208 }
1209
1210 return (0);
1211 } /* ftdi_sio_attach */
1212
1213
1214 /* Setup for the USB-UIRT device, which requires hardwired
1215 * baudrate (38400 gets mapped to 312500) */
1216 /* Called from usbserial:serial_probe */
1217 static void ftdi_USB_UIRT_setup (struct usb_serial *serial)
1218 {
1219 struct ftdi_private *priv;
1220
1221 dbg("%s",__FUNCTION__);
1222
1223 priv = usb_get_serial_port_data(serial->port[0]);
1224 priv->flags |= ASYNC_SPD_CUST;
1225 priv->custom_divisor = 77;
1226 priv->force_baud = B38400;
1227 } /* ftdi_USB_UIRT_setup */
1228
1229 /* Setup for the HE-TIRA1 device, which requires hardwired
1230 * baudrate (38400 gets mapped to 100000) and RTS-CTS enabled. */
1231 static void ftdi_HE_TIRA1_setup (struct usb_serial *serial)
1232 {
1233 struct ftdi_private *priv;
1234
1235 dbg("%s",__FUNCTION__);
1236
1237 priv = usb_get_serial_port_data(serial->port[0]);
1238 priv->flags |= ASYNC_SPD_CUST;
1239 priv->custom_divisor = 240;
1240 priv->force_baud = B38400;
1241 priv->force_rtscts = 1;
1242 } /* ftdi_HE_TIRA1_setup */
1243
1244
1245 /* ftdi_shutdown is called from usbserial:usb_serial_disconnect
1246 * it is called when the usb device is disconnected
1247 *
1248 * usbserial:usb_serial_disconnect
1249 * calls __serial_close for each open of the port
1250 * shutdown is called then (ie ftdi_shutdown)
1251 */
1252
1253
1254 static void ftdi_shutdown (struct usb_serial *serial)
1255 { /* ftdi_shutdown */
1256
1257 struct usb_serial_port *port = serial->port[0];
1258 struct ftdi_private *priv = usb_get_serial_port_data(port);
1259
1260 dbg("%s", __FUNCTION__);
1261
1262 remove_sysfs_attrs(serial);
1263
1264 /* all open ports are closed at this point
1265 * (by usbserial.c:__serial_close, which calls ftdi_close)
1266 */
1267
1268 if (priv) {
1269 usb_set_serial_port_data(port, NULL);
1270 kfree(priv);
1271 }
1272 } /* ftdi_shutdown */
1273
1274
1275 static int ftdi_open (struct usb_serial_port *port, struct file *filp)
1276 { /* ftdi_open */
1277 struct usb_device *dev = port->serial->dev;
1278 struct ftdi_private *priv = usb_get_serial_port_data(port);
1279 unsigned long flags;
1280
1281 int result = 0;
1282 char buf[1]; /* Needed for the usb_control_msg I think */
1283
1284 dbg("%s", __FUNCTION__);
1285
1286 spin_lock_irqsave(&priv->tx_lock, flags);
1287 priv->tx_bytes = 0;
1288 spin_unlock_irqrestore(&priv->tx_lock, flags);
1289 spin_lock_irqsave(&priv->rx_lock, flags);
1290 priv->rx_bytes = 0;
1291 spin_unlock_irqrestore(&priv->rx_lock, flags);
1292
1293 if (port->tty)
1294 port->tty->low_latency = (priv->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
1295
1296 /* No error checking for this (will get errors later anyway) */
1297 /* See ftdi_sio.h for description of what is reset */
1298 usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
1299 FTDI_SIO_RESET_REQUEST, FTDI_SIO_RESET_REQUEST_TYPE,
1300 FTDI_SIO_RESET_SIO,
1301 priv->interface, buf, 0, WDR_TIMEOUT);
1302
1303 /* Termios defaults are set by usb_serial_init. We don't change
1304 port->tty->termios - this would loose speed settings, etc.
1305 This is same behaviour as serial.c/rs_open() - Kuba */
1306
1307 /* ftdi_set_termios will send usb control messages */
1308 if (port->tty)
1309 ftdi_set_termios(port, NULL);
1310
1311 /* FIXME: Flow control might be enabled, so it should be checked -
1312 we have no control of defaults! */
1313 /* Turn on RTS and DTR since we are not flow controlling by default */
1314 set_mctrl(port, TIOCM_DTR | TIOCM_RTS);
1315
1316 /* Not throttled */
1317 spin_lock_irqsave(&priv->rx_lock, flags);
1318 priv->rx_flags &= ~(THROTTLED | ACTUALLY_THROTTLED);
1319 spin_unlock_irqrestore(&priv->rx_lock, flags);
1320
1321 /* Start reading from the device */
1322 priv->rx_processed = 0;
1323 usb_fill_bulk_urb(port->read_urb, dev,
1324 usb_rcvbulkpipe(dev, port->bulk_in_endpointAddress),
1325 port->read_urb->transfer_buffer, port->read_urb->transfer_buffer_length,
1326 ftdi_read_bulk_callback, port);
1327 result = usb_submit_urb(port->read_urb, GFP_KERNEL);
1328 if (result)
1329 err("%s - failed submitting read urb, error %d", __FUNCTION__, result);
1330
1331
1332 return result;
1333 } /* ftdi_open */
1334
1335
1336
1337 /*
1338 * usbserial:__serial_close only calls ftdi_close if the point is open
1339 *
1340 * This only gets called when it is the last close
1341 *
1342 *
1343 */
1344
1345 static void ftdi_close (struct usb_serial_port *port, struct file *filp)
1346 { /* ftdi_close */
1347 unsigned int c_cflag = port->tty->termios->c_cflag;
1348 struct ftdi_private *priv = usb_get_serial_port_data(port);
1349 char buf[1];
1350
1351 dbg("%s", __FUNCTION__);
1352
1353 if (c_cflag & HUPCL){
1354 /* Disable flow control */
1355 if (usb_control_msg(port->serial->dev,
1356 usb_sndctrlpipe(port->serial->dev, 0),
1357 FTDI_SIO_SET_FLOW_CTRL_REQUEST,
1358 FTDI_SIO_SET_FLOW_CTRL_REQUEST_TYPE,
1359 0, priv->interface, buf, 0,
1360 WDR_TIMEOUT) < 0) {
1361 err("error from flowcontrol urb");
1362 }
1363
1364 /* drop RTS and DTR */
1365 clear_mctrl(port, TIOCM_DTR | TIOCM_RTS);
1366 } /* Note change no line if hupcl is off */
1367
1368 /* cancel any scheduled reading */
1369 cancel_delayed_work(&priv->rx_work);
1370 flush_scheduled_work();
1371
1372 /* shutdown our bulk read */
1373 if (port->read_urb)
1374 usb_kill_urb(port->read_urb);
1375 } /* ftdi_close */
1376
1377
1378
1379 /* The SIO requires the first byte to have:
1380 * B0 1
1381 * B1 0
1382 * B2..7 length of message excluding byte 0
1383 *
1384 * The new devices do not require this byte
1385 */
1386 static int ftdi_write (struct usb_serial_port *port,
1387 const unsigned char *buf, int count)
1388 { /* ftdi_write */
1389 struct ftdi_private *priv = usb_get_serial_port_data(port);
1390 struct urb *urb;
1391 unsigned char *buffer;
1392 int data_offset ; /* will be 1 for the SIO and 0 otherwise */
1393 int status;
1394 int transfer_size;
1395 unsigned long flags;
1396
1397 dbg("%s port %d, %d bytes", __FUNCTION__, port->number, count);
1398
1399 if (count == 0) {
1400 dbg("write request of 0 bytes");
1401 return 0;
1402 }
1403 spin_lock_irqsave(&priv->tx_lock, flags);
1404 if (priv->tx_outstanding_urbs > URB_UPPER_LIMIT) {
1405 spin_unlock_irqrestore(&priv->tx_lock, flags);
1406 dbg("%s - write limit hit\n", __FUNCTION__);
1407 return 0;
1408 }
1409 spin_unlock_irqrestore(&priv->tx_lock, flags);
1410
1411 data_offset = priv->write_offset;
1412 dbg("data_offset set to %d",data_offset);
1413
1414 /* Determine total transfer size */
1415 transfer_size = count;
1416 if (data_offset > 0) {
1417 /* Original sio needs control bytes too... */
1418 transfer_size += (data_offset *
1419 ((count + (PKTSZ - 1 - data_offset)) /
1420 (PKTSZ - data_offset)));
1421 }
1422
1423 buffer = kmalloc (transfer_size, GFP_ATOMIC);
1424 if (!buffer) {
1425 err("%s ran out of kernel memory for urb ...", __FUNCTION__);
1426 return -ENOMEM;
1427 }
1428
1429 urb = usb_alloc_urb(0, GFP_ATOMIC);
1430 if (!urb) {
1431 err("%s - no more free urbs", __FUNCTION__);
1432 kfree (buffer);
1433 return -ENOMEM;
1434 }
1435
1436 /* Copy data */
1437 if (data_offset > 0) {
1438 /* Original sio requires control byte at start of each packet. */
1439 int user_pktsz = PKTSZ - data_offset;
1440 int todo = count;
1441 unsigned char *first_byte = buffer;
1442 const unsigned char *current_position = buf;
1443
1444 while (todo > 0) {
1445 if (user_pktsz > todo) {
1446 user_pktsz = todo;
1447 }
1448 /* Write the control byte at the front of the packet*/
1449 *first_byte = 1 | ((user_pktsz) << 2);
1450 /* Copy data for packet */
1451 memcpy (first_byte + data_offset,
1452 current_position, user_pktsz);
1453 first_byte += user_pktsz + data_offset;
1454 current_position += user_pktsz;
1455 todo -= user_pktsz;
1456 }
1457 } else {
1458 /* No control byte required. */
1459 /* Copy in the data to send */
1460 memcpy (buffer, buf, count);
1461 }
1462
1463 usb_serial_debug_data(debug, &port->dev, __FUNCTION__, transfer_size, buffer);
1464
1465 /* fill the buffer and send it */
1466 usb_fill_bulk_urb(urb, port->serial->dev,
1467 usb_sndbulkpipe(port->serial->dev, port->bulk_out_endpointAddress),
1468 buffer, transfer_size,
1469 ftdi_write_bulk_callback, port);
1470
1471 status = usb_submit_urb(urb, GFP_ATOMIC);
1472 if (status) {
1473 err("%s - failed submitting write urb, error %d", __FUNCTION__, status);
1474 count = status;
1475 kfree (buffer);
1476 } else {
1477 spin_lock_irqsave(&priv->tx_lock, flags);
1478 ++priv->tx_outstanding_urbs;
1479 priv->tx_outstanding_bytes += count;
1480 priv->tx_bytes += count;
1481 spin_unlock_irqrestore(&priv->tx_lock, flags);
1482 }
1483
1484 /* we are done with this urb, so let the host driver
1485 * really free it when it is finished with it */
1486 usb_free_urb (urb);
1487
1488 dbg("%s write returning: %d", __FUNCTION__, count);
1489 return count;
1490 } /* ftdi_write */
1491
1492
1493 /* This function may get called when the device is closed */
1494
1495 static void ftdi_write_bulk_callback (struct urb *urb, struct pt_regs *regs)
1496 {
1497 unsigned long flags;
1498 struct usb_serial_port *port = (struct usb_serial_port *)urb->context;
1499 struct ftdi_private *priv;
1500 int data_offset; /* will be 1 for the SIO and 0 otherwise */
1501 unsigned long countback;
1502
1503 /* free up the transfer buffer, as usb_free_urb() does not do this */
1504 kfree (urb->transfer_buffer);
1505
1506 dbg("%s - port %d", __FUNCTION__, port->number);
1507
1508 if (urb->status) {
1509 dbg("nonzero write bulk status received: %d", urb->status);
1510 return;
1511 }
1512
1513 priv = usb_get_serial_port_data(port);
1514 if (!priv) {
1515 dbg("%s - bad port private data pointer - exiting", __FUNCTION__);
1516 return;
1517 }
1518 /* account for transferred data */
1519 countback = urb->actual_length;
1520 data_offset = priv->write_offset;
1521 if (data_offset > 0) {
1522 /* Subtract the control bytes */
1523 countback -= (data_offset * ((countback + (PKTSZ - 1)) / PKTSZ));
1524 }
1525 spin_lock_irqsave(&priv->tx_lock, flags);
1526 --priv->tx_outstanding_urbs;
1527 priv->tx_outstanding_bytes -= countback;
1528 spin_unlock_irqrestore(&priv->tx_lock, flags);
1529
1530 usb_serial_port_softint(port);
1531 } /* ftdi_write_bulk_callback */
1532
1533
1534 static int ftdi_write_room( struct usb_serial_port *port )
1535 {
1536 struct ftdi_private *priv = usb_get_serial_port_data(port);
1537 int room;
1538 unsigned long flags;
1539
1540 dbg("%s - port %d", __FUNCTION__, port->number);
1541
1542 spin_lock_irqsave(&priv->tx_lock, flags);
1543 if (priv->tx_outstanding_urbs < URB_UPPER_LIMIT) {
1544 /*
1545 * We really can take anything the user throws at us
1546 * but let's pick a nice big number to tell the tty
1547 * layer that we have lots of free space
1548 */
1549 room = 2048;
1550 } else {
1551 room = 0;
1552 }
1553 spin_unlock_irqrestore(&priv->tx_lock, flags);
1554 return room;
1555 } /* ftdi_write_room */
1556
1557
1558 static int ftdi_chars_in_buffer (struct usb_serial_port *port)
1559 { /* ftdi_chars_in_buffer */
1560 struct ftdi_private *priv = usb_get_serial_port_data(port);
1561 int buffered;
1562 unsigned long flags;
1563
1564 dbg("%s - port %d", __FUNCTION__, port->number);
1565
1566 spin_lock_irqsave(&priv->tx_lock, flags);
1567 buffered = (int)priv->tx_outstanding_bytes;
1568 spin_unlock_irqrestore(&priv->tx_lock, flags);
1569 if (buffered < 0) {
1570 err("%s outstanding tx bytes is negative!", __FUNCTION__);
1571 buffered = 0;
1572 }
1573 return buffered;
1574 } /* ftdi_chars_in_buffer */
1575
1576
1577
1578 static void ftdi_read_bulk_callback (struct urb *urb, struct pt_regs *regs)
1579 { /* ftdi_read_bulk_callback */
1580 struct usb_serial_port *port = (struct usb_serial_port *)urb->context;
1581 struct tty_struct *tty;
1582 struct ftdi_private *priv;
1583 unsigned long countread;
1584 unsigned long flags;
1585
1586 if (urb->number_of_packets > 0) {
1587 err("%s transfer_buffer_length %d actual_length %d number of packets %d",__FUNCTION__,
1588 urb->transfer_buffer_length, urb->actual_length, urb->number_of_packets );
1589 err("%s transfer_flags %x ", __FUNCTION__,urb->transfer_flags );
1590 }
1591
1592 dbg("%s - port %d", __FUNCTION__, port->number);
1593
1594 if (port->open_count <= 0)
1595 return;
1596
1597 tty = port->tty;
1598 if (!tty) {
1599 dbg("%s - bad tty pointer - exiting",__FUNCTION__);
1600 return;
1601 }
1602
1603 priv = usb_get_serial_port_data(port);
1604 if (!priv) {
1605 dbg("%s - bad port private data pointer - exiting", __FUNCTION__);
1606 return;
1607 }
1608
1609 if (urb != port->read_urb) {
1610 err("%s - Not my urb!", __FUNCTION__);
1611 }
1612
1613 if (urb->status) {
1614 /* This will happen at close every time so it is a dbg not an err */
1615 dbg("(this is ok on close) nonzero read bulk status received: %d", urb->status);
1616 return;
1617 }
1618
1619 /* count data bytes, but not status bytes */
1620 countread = urb->actual_length;
1621 countread -= 2 * ((countread + (PKTSZ - 1)) / PKTSZ);
1622 spin_lock_irqsave(&priv->rx_lock, flags);
1623 priv->rx_bytes += countread;
1624 spin_unlock_irqrestore(&priv->rx_lock, flags);
1625
1626 ftdi_process_read(port);
1627
1628 } /* ftdi_read_bulk_callback */
1629
1630
1631 static void ftdi_process_read (void *param)
1632 { /* ftdi_process_read */
1633 struct usb_serial_port *port = (struct usb_serial_port*)param;
1634 struct urb *urb;
1635 struct tty_struct *tty;
1636 struct ftdi_private *priv;
1637 char error_flag;
1638 unsigned char *data;
1639
1640 int i;
1641 int result;
1642 int need_flip;
1643 int packet_offset;
1644 unsigned long flags;
1645
1646 dbg("%s - port %d", __FUNCTION__, port->number);
1647
1648 if (port->open_count <= 0)
1649 return;
1650
1651 tty = port->tty;
1652 if (!tty) {
1653 dbg("%s - bad tty pointer - exiting",__FUNCTION__);
1654 return;
1655 }
1656
1657 priv = usb_get_serial_port_data(port);
1658 if (!priv) {
1659 dbg("%s - bad port private data pointer - exiting", __FUNCTION__);
1660 return;
1661 }
1662
1663 urb = port->read_urb;
1664 if (!urb) {
1665 dbg("%s - bad read_urb pointer - exiting", __FUNCTION__);
1666 return;
1667 }
1668
1669 data = urb->transfer_buffer;
1670
1671 if (priv->rx_processed) {
1672 dbg("%s - already processed: %d bytes, %d remain", __FUNCTION__,
1673 priv->rx_processed,
1674 urb->actual_length - priv->rx_processed);
1675 } else {
1676 /* The first two bytes of every read packet are status */
1677 if (urb->actual_length > 2) {
1678 usb_serial_debug_data(debug, &port->dev, __FUNCTION__, urb->actual_length, data);
1679 } else {
1680 dbg("Status only: %03oo %03oo",data[0],data[1]);
1681 }
1682 }
1683
1684
1685 /* TO DO -- check for hung up line and handle appropriately: */
1686 /* send hangup */
1687 /* See acm.c - you do a tty_hangup - eg tty_hangup(tty) */
1688 /* if CD is dropped and the line is not CLOCAL then we should hangup */
1689
1690 need_flip = 0;
1691 for (packet_offset = priv->rx_processed; packet_offset < urb->actual_length; packet_offset += PKTSZ) {
1692 int length;
1693
1694 /* Compare new line status to the old one, signal if different */
1695 /* N.B. packet may be processed more than once, but differences
1696 * are only processed once. */
1697 if (priv != NULL) {
1698 char new_status = data[packet_offset+0] & FTDI_STATUS_B0_MASK;
1699 if (new_status != priv->prev_status) {
1700 priv->diff_status |= new_status ^ priv->prev_status;
1701 wake_up_interruptible(&priv->delta_msr_wait);
1702 priv->prev_status = new_status;
1703 }
1704 }
1705
1706 length = min(PKTSZ, urb->actual_length-packet_offset)-2;
1707 if (length < 0) {
1708 err("%s - bad packet length: %d", __FUNCTION__, length+2);
1709 length = 0;
1710 }
1711
1712 if (priv->rx_flags & THROTTLED) {
1713 dbg("%s - throttled", __FUNCTION__);
1714 break;
1715 }
1716 if (tty_buffer_request_room(tty, length) < length) {
1717 /* break out & wait for throttling/unthrottling to happen */
1718 dbg("%s - receive room low", __FUNCTION__);
1719 break;
1720 }
1721
1722 /* Handle errors and break */
1723 error_flag = TTY_NORMAL;
1724 /* Although the device uses a bitmask and hence can have multiple */
1725 /* errors on a packet - the order here sets the priority the */
1726 /* error is returned to the tty layer */
1727
1728 if ( data[packet_offset+1] & FTDI_RS_OE ) {
1729 error_flag = TTY_OVERRUN;
1730 dbg("OVERRRUN error");
1731 }
1732 if ( data[packet_offset+1] & FTDI_RS_BI ) {
1733 error_flag = TTY_BREAK;
1734 dbg("BREAK received");
1735 }
1736 if ( data[packet_offset+1] & FTDI_RS_PE ) {
1737 error_flag = TTY_PARITY;
1738 dbg("PARITY error");
1739 }
1740 if ( data[packet_offset+1] & FTDI_RS_FE ) {
1741 error_flag = TTY_FRAME;
1742 dbg("FRAMING error");
1743 }
1744 if (length > 0) {
1745 for (i = 2; i < length+2; i++) {
1746 /* Note that the error flag is duplicated for
1747 every character received since we don't know
1748 which character it applied to */
1749 tty_insert_flip_char(tty, data[packet_offset+i], error_flag);
1750 }
1751 need_flip = 1;
1752 }
1753
1754 #ifdef NOT_CORRECT_BUT_KEEPING_IT_FOR_NOW
1755 /* if a parity error is detected you get status packets forever
1756 until a character is sent without a parity error.
1757 This doesn't work well since the application receives a never
1758 ending stream of bad data - even though new data hasn't been sent.
1759 Therefore I (bill) have taken this out.
1760 However - this might make sense for framing errors and so on
1761 so I am leaving the code in for now.
1762 */
1763 else {
1764 if (error_flag != TTY_NORMAL){
1765 dbg("error_flag is not normal");
1766 /* In this case it is just status - if that is an error send a bad character */
1767 if(tty->flip.count >= TTY_FLIPBUF_SIZE) {
1768 tty_flip_buffer_push(tty);
1769 }
1770 tty_insert_flip_char(tty, 0xff, error_flag);
1771 need_flip = 1;
1772 }
1773 }
1774 #endif
1775 } /* "for(packet_offset=0..." */
1776
1777 /* Low latency */
1778 if (need_flip) {
1779 tty_flip_buffer_push(tty);
1780 }
1781
1782 if (packet_offset < urb->actual_length) {
1783 /* not completely processed - record progress */
1784 priv->rx_processed = packet_offset;
1785 dbg("%s - incomplete, %d bytes processed, %d remain",
1786 __FUNCTION__, packet_offset,
1787 urb->actual_length - packet_offset);
1788 /* check if we were throttled while processing */
1789 spin_lock_irqsave(&priv->rx_lock, flags);
1790 if (priv->rx_flags & THROTTLED) {
1791 priv->rx_flags |= ACTUALLY_THROTTLED;
1792 spin_unlock_irqrestore(&priv->rx_lock, flags);
1793 dbg("%s - deferring remainder until unthrottled",
1794 __FUNCTION__);
1795 return;
1796 }
1797 spin_unlock_irqrestore(&priv->rx_lock, flags);
1798 /* if the port is closed stop trying to read */
1799 if (port->open_count > 0){
1800 /* delay processing of remainder */
1801 schedule_delayed_work(&priv->rx_work, 1);
1802 } else {
1803 dbg("%s - port is closed", __FUNCTION__);
1804 }
1805 return;
1806 }
1807
1808 /* urb is completely processed */
1809 priv->rx_processed = 0;
1810
1811 /* if the port is closed stop trying to read */
1812 if (port->open_count > 0){
1813 /* Continue trying to always read */
1814 usb_fill_bulk_urb(port->read_urb, port->serial->dev,
1815 usb_rcvbulkpipe(port->serial->dev, port->bulk_in_endpointAddress),
1816 port->read_urb->transfer_buffer, port->read_urb->transfer_buffer_length,
1817 ftdi_read_bulk_callback, port);
1818
1819 result = usb_submit_urb(port->read_urb, GFP_ATOMIC);
1820 if (result)
1821 err("%s - failed resubmitting read urb, error %d", __FUNCTION__, result);
1822 }
1823
1824 return;
1825 } /* ftdi_process_read */
1826
1827
1828 static void ftdi_break_ctl( struct usb_serial_port *port, int break_state )
1829 {
1830 struct ftdi_private *priv = usb_get_serial_port_data(port);
1831 __u16 urb_value = 0;
1832 char buf[1];
1833
1834 /* break_state = -1 to turn on break, and 0 to turn off break */
1835 /* see drivers/char/tty_io.c to see it used */
1836 /* last_set_data_urb_value NEVER has the break bit set in it */
1837
1838 if (break_state) {
1839 urb_value = priv->last_set_data_urb_value | FTDI_SIO_SET_BREAK;
1840 } else {
1841 urb_value = priv->last_set_data_urb_value;
1842 }
1843
1844
1845 if (usb_control_msg(port->serial->dev, usb_sndctrlpipe(port->serial->dev, 0),
1846 FTDI_SIO_SET_DATA_REQUEST,
1847 FTDI_SIO_SET_DATA_REQUEST_TYPE,
1848 urb_value , priv->interface,
1849 buf, 0, WDR_TIMEOUT) < 0) {
1850 err("%s FAILED to enable/disable break state (state was %d)", __FUNCTION__,break_state);
1851 }
1852
1853 dbg("%s break state is %d - urb is %d", __FUNCTION__,break_state, urb_value);
1854
1855 }
1856
1857
1858 /* old_termios contains the original termios settings and tty->termios contains
1859 * the new setting to be used
1860 * WARNING: set_termios calls this with old_termios in kernel space
1861 */
1862
1863 static void ftdi_set_termios (struct usb_serial_port *port, struct termios *old_termios)
1864 { /* ftdi_termios */
1865 struct usb_device *dev = port->serial->dev;
1866 unsigned int cflag = port->tty->termios->c_cflag;
1867 struct ftdi_private *priv = usb_get_serial_port_data(port);
1868 __u16 urb_value; /* will hold the new flags */
1869 char buf[1]; /* Perhaps I should dynamically alloc this? */
1870
1871 // Added for xon/xoff support
1872 unsigned int iflag = port->tty->termios->c_iflag;
1873 unsigned char vstop;
1874 unsigned char vstart;
1875
1876 dbg("%s", __FUNCTION__);
1877
1878 /* Force baud rate if this device requires it, unless it is set to B0. */
1879 if (priv->force_baud && ((port->tty->termios->c_cflag & CBAUD) != B0)) {
1880 dbg("%s: forcing baud rate for this device", __FUNCTION__);
1881 port->tty->termios->c_cflag &= ~CBAUD;
1882 port->tty->termios->c_cflag |= priv->force_baud;
1883 }
1884
1885 /* Force RTS-CTS if this device requires it. */
1886 if (priv->force_rtscts) {
1887 dbg("%s: forcing rtscts for this device", __FUNCTION__);
1888 port->tty->termios->c_cflag |= CRTSCTS;
1889 }
1890
1891 cflag = port->tty->termios->c_cflag;
1892
1893 /* FIXME -For this cut I don't care if the line is really changing or
1894 not - so just do the change regardless - should be able to
1895 compare old_termios and tty->termios */
1896 /* NOTE These routines can get interrupted by
1897 ftdi_sio_read_bulk_callback - need to examine what this
1898 means - don't see any problems yet */
1899
1900 /* Set number of data bits, parity, stop bits */
1901
1902 urb_value = 0;
1903 urb_value |= (cflag & CSTOPB ? FTDI_SIO_SET_DATA_STOP_BITS_2 :
1904 FTDI_SIO_SET_DATA_STOP_BITS_1);
1905 urb_value |= (cflag & PARENB ?
1906 (cflag & PARODD ? FTDI_SIO_SET_DATA_PARITY_ODD :
1907 FTDI_SIO_SET_DATA_PARITY_EVEN) :
1908 FTDI_SIO_SET_DATA_PARITY_NONE);
1909 if (cflag & CSIZE) {
1910 switch (cflag & CSIZE) {
1911 case CS5: urb_value |= 5; dbg("Setting CS5"); break;
1912 case CS6: urb_value |= 6; dbg("Setting CS6"); break;
1913 case CS7: urb_value |= 7; dbg("Setting CS7"); break;
1914 case CS8: urb_value |= 8; dbg("Setting CS8"); break;
1915 default:
1916 err("CSIZE was set but not CS5-CS8");
1917 }
1918 }
1919
1920 /* This is needed by the break command since it uses the same command - but is
1921 * or'ed with this value */
1922 priv->last_set_data_urb_value = urb_value;
1923
1924 if (usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
1925 FTDI_SIO_SET_DATA_REQUEST,
1926 FTDI_SIO_SET_DATA_REQUEST_TYPE,
1927 urb_value , priv->interface,
1928 buf, 0, WDR_SHORT_TIMEOUT) < 0) {
1929 err("%s FAILED to set databits/stopbits/parity", __FUNCTION__);
1930 }
1931
1932 /* Now do the baudrate */
1933 if ((cflag & CBAUD) == B0 ) {
1934 /* Disable flow control */
1935 if (usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
1936 FTDI_SIO_SET_FLOW_CTRL_REQUEST,
1937 FTDI_SIO_SET_FLOW_CTRL_REQUEST_TYPE,
1938 0, priv->interface,
1939 buf, 0, WDR_TIMEOUT) < 0) {
1940 err("%s error from disable flowcontrol urb", __FUNCTION__);
1941 }
1942 /* Drop RTS and DTR */
1943 clear_mctrl(port, TIOCM_DTR | TIOCM_RTS);
1944 } else {
1945 /* set the baudrate determined before */
1946 if (change_speed(port)) {
1947 err("%s urb failed to set baudrate", __FUNCTION__);
1948 }
1949 /* Ensure RTS and DTR are raised when baudrate changed from 0 */
1950 if (!old_termios || (old_termios->c_cflag & CBAUD) == B0) {
1951 set_mctrl(port, TIOCM_DTR | TIOCM_RTS);
1952 }
1953 }
1954
1955 /* Set flow control */
1956 /* Note device also supports DTR/CD (ugh) and Xon/Xoff in hardware */
1957 if (cflag & CRTSCTS) {
1958 dbg("%s Setting to CRTSCTS flow control", __FUNCTION__);
1959 if (usb_control_msg(dev,
1960 usb_sndctrlpipe(dev, 0),
1961 FTDI_SIO_SET_FLOW_CTRL_REQUEST,
1962 FTDI_SIO_SET_FLOW_CTRL_REQUEST_TYPE,
1963 0 , (FTDI_SIO_RTS_CTS_HS | priv->interface),
1964 buf, 0, WDR_TIMEOUT) < 0) {
1965 err("urb failed to set to rts/cts flow control");
1966 }
1967
1968 } else {
1969 /*
1970 * Xon/Xoff code
1971 *
1972 * Check the IXOFF status in the iflag component of the termios structure
1973 * if IXOFF is not set, the pre-xon/xoff code is executed.
1974 */
1975 if (iflag & IXOFF) {
1976 dbg("%s request to enable xonxoff iflag=%04x",__FUNCTION__,iflag);
1977 // Try to enable the XON/XOFF on the ftdi_sio
1978 // Set the vstart and vstop -- could have been done up above where
1979 // a lot of other dereferencing is done but that would be very
1980 // inefficient as vstart and vstop are not always needed
1981 vstart=port->tty->termios->c_cc[VSTART];
1982 vstop=port->tty->termios->c_cc[VSTOP];
1983 urb_value=(vstop << 8) | (vstart);
1984
1985 if (usb_control_msg(dev,
1986 usb_sndctrlpipe(dev, 0),
1987 FTDI_SIO_SET_FLOW_CTRL_REQUEST,
1988 FTDI_SIO_SET_FLOW_CTRL_REQUEST_TYPE,
1989 urb_value , (FTDI_SIO_XON_XOFF_HS
1990 | priv->interface),
1991 buf, 0, WDR_TIMEOUT) < 0) {
1992 err("urb failed to set to xon/xoff flow control");
1993 }
1994 } else {
1995 /* else clause to only run if cfag ! CRTSCTS and iflag ! XOFF */
1996 /* CHECKME Assuming XON/XOFF handled by tty stack - not by device */
1997 dbg("%s Turning off hardware flow control", __FUNCTION__);
1998 if (usb_control_msg(dev,
1999 usb_sndctrlpipe(dev, 0),
2000 FTDI_SIO_SET_FLOW_CTRL_REQUEST,
2001 FTDI_SIO_SET_FLOW_CTRL_REQUEST_TYPE,
2002 0, priv->interface,
2003 buf, 0, WDR_TIMEOUT) < 0) {
2004 err("urb failed to clear flow control");
2005 }
2006 }
2007
2008 }
2009 return;
2010 } /* ftdi_termios */
2011
2012
2013 static int ftdi_tiocmget (struct usb_serial_port *port, struct file *file)
2014 {
2015 struct ftdi_private *priv = usb_get_serial_port_data(port);
2016 unsigned char buf[2];
2017 int ret;
2018
2019 dbg("%s TIOCMGET", __FUNCTION__);
2020 switch (priv->chip_type) {
2021 case SIO:
2022 /* Request the status from the device */
2023 if ((ret = usb_control_msg(port->serial->dev,
2024 usb_rcvctrlpipe(port->serial->dev, 0),
2025 FTDI_SIO_GET_MODEM_STATUS_REQUEST,
2026 FTDI_SIO_GET_MODEM_STATUS_REQUEST_TYPE,
2027 0, 0,
2028 buf, 1, WDR_TIMEOUT)) < 0 ) {
2029 err("%s Could not get modem status of device - err: %d", __FUNCTION__,
2030 ret);
2031 return(ret);
2032 }
2033 break;
2034 case FT8U232AM:
2035 case FT232BM:
2036 case FT2232C:
2037 /* the 8U232AM returns a two byte value (the sio is a 1 byte value) - in the same
2038 format as the data returned from the in point */
2039 if ((ret = usb_control_msg(port->serial->dev,
2040 usb_rcvctrlpipe(port->serial->dev, 0),
2041 FTDI_SIO_GET_MODEM_STATUS_REQUEST,
2042 FTDI_SIO_GET_MODEM_STATUS_REQUEST_TYPE,
2043 0, priv->interface,
2044 buf, 2, WDR_TIMEOUT)) < 0 ) {
2045 err("%s Could not get modem status of device - err: %d", __FUNCTION__,
2046 ret);
2047 return(ret);
2048 }
2049 break;
2050 default:
2051 return -EFAULT;
2052 break;
2053 }
2054
2055 return (buf[0] & FTDI_SIO_DSR_MASK ? TIOCM_DSR : 0) |
2056 (buf[0] & FTDI_SIO_CTS_MASK ? TIOCM_CTS : 0) |
2057 (buf[0] & FTDI_SIO_RI_MASK ? TIOCM_RI : 0) |
2058 (buf[0] & FTDI_SIO_RLSD_MASK ? TIOCM_CD : 0) |
2059 priv->last_dtr_rts;
2060 }
2061
2062 static int ftdi_tiocmset(struct usb_serial_port *port, struct file * file, unsigned int set, unsigned int clear)
2063 {
2064 dbg("%s TIOCMSET", __FUNCTION__);
2065 return update_mctrl(port, set, clear);
2066 }
2067
2068
2069 static int ftdi_ioctl (struct usb_serial_port *port, struct file * file, unsigned int cmd, unsigned long arg)
2070 {
2071 struct ftdi_private *priv = usb_get_serial_port_data(port);
2072
2073 dbg("%s cmd 0x%04x", __FUNCTION__, cmd);
2074
2075 /* Based on code from acm.c and others */
2076 switch (cmd) {
2077
2078 case TIOCGSERIAL: /* gets serial port data */
2079 return get_serial_info(port, (struct serial_struct __user *) arg);
2080
2081 case TIOCSSERIAL: /* sets serial port data */
2082 return set_serial_info(port, (struct serial_struct __user *) arg);
2083
2084 /*
2085 * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change
2086 * - mask passed in arg for lines of interest
2087 * (use |'ed TIOCM_RNG/DSR/CD/CTS for masking)
2088 * Caller should use TIOCGICOUNT to see which one it was.
2089 *
2090 * This code is borrowed from linux/drivers/char/serial.c
2091 */
2092 case TIOCMIWAIT:
2093 while (priv != NULL) {
2094 interruptible_sleep_on(&priv->delta_msr_wait);
2095 /* see if a signal did it */
2096 if (signal_pending(current))
2097 return -ERESTARTSYS;
2098 else {
2099 char diff = priv->diff_status;
2100
2101 if (diff == 0) {
2102 return -EIO; /* no change => error */
2103 }
2104
2105 /* Consume all events */
2106 priv->diff_status = 0;
2107
2108 /* Return 0 if caller wanted to know about these bits */
2109 if ( ((arg & TIOCM_RNG) && (diff & FTDI_RS0_RI)) ||
2110 ((arg & TIOCM_DSR) && (diff & FTDI_RS0_DSR)) ||
2111 ((arg & TIOCM_CD) && (diff & FTDI_RS0_RLSD)) ||
2112 ((arg & TIOCM_CTS) && (diff & FTDI_RS0_CTS)) ) {
2113 return 0;
2114 }
2115 /*
2116 * Otherwise caller can't care less about what happened,
2117 * and so we continue to wait for more events.
2118 */
2119 }
2120 }
2121 return(0);
2122 break;
2123 default:
2124 break;
2125
2126 }
2127
2128
2129 /* This is not necessarily an error - turns out the higher layers will do
2130 * some ioctls itself (see comment above)
2131 */
2132 dbg("%s arg not supported - it was 0x%04x - check /usr/include/asm/ioctls.h", __FUNCTION__, cmd);
2133
2134 return(-ENOIOCTLCMD);
2135 } /* ftdi_ioctl */
2136
2137
2138 static void ftdi_throttle (struct usb_serial_port *port)
2139 {
2140 struct ftdi_private *priv = usb_get_serial_port_data(port);
2141 unsigned long flags;
2142
2143 dbg("%s - port %d", __FUNCTION__, port->number);
2144
2145 spin_lock_irqsave(&priv->rx_lock, flags);
2146 priv->rx_flags |= THROTTLED;
2147 spin_unlock_irqrestore(&priv->rx_lock, flags);
2148 }
2149
2150
2151 static void ftdi_unthrottle (struct usb_serial_port *port)
2152 {
2153 struct ftdi_private *priv = usb_get_serial_port_data(port);
2154 int actually_throttled;
2155 unsigned long flags;
2156
2157 dbg("%s - port %d", __FUNCTION__, port->number);
2158
2159 spin_lock_irqsave(&priv->rx_lock, flags);
2160 actually_throttled = priv->rx_flags & ACTUALLY_THROTTLED;
2161 priv->rx_flags &= ~(THROTTLED | ACTUALLY_THROTTLED);
2162 spin_unlock_irqrestore(&priv->rx_lock, flags);
2163
2164 if (actually_throttled)
2165 schedule_work(&priv->rx_work);
2166 }
2167
2168 static int __init ftdi_init (void)
2169 {
2170 int retval;
2171
2172 dbg("%s", __FUNCTION__);
2173 if (vendor > 0 && product > 0) {
2174 /* Add user specified VID/PID to reserved element of table. */
2175 int i;
2176 for (i = 0; id_table_combined[i].idVendor; i++)
2177 ;
2178 id_table_combined[i].match_flags = USB_DEVICE_ID_MATCH_DEVICE;
2179 id_table_combined[i].idVendor = vendor;
2180 id_table_combined[i].idProduct = product;
2181 }
2182 retval = usb_serial_register(&ftdi_sio_device);
2183 if (retval)
2184 goto failed_sio_register;
2185 retval = usb_register(&ftdi_driver);
2186 if (retval)
2187 goto failed_usb_register;
2188
2189 info(DRIVER_VERSION ":" DRIVER_DESC);
2190 return 0;
2191 failed_usb_register:
2192 usb_serial_deregister(&ftdi_sio_device);
2193 failed_sio_register:
2194 return retval;
2195 }
2196
2197
2198 static void __exit ftdi_exit (void)
2199 {
2200
2201 dbg("%s", __FUNCTION__);
2202
2203 usb_deregister (&ftdi_driver);
2204 usb_serial_deregister (&ftdi_sio_device);
2205
2206 }
2207
2208
2209 module_init(ftdi_init);
2210 module_exit(ftdi_exit);
2211
2212 MODULE_AUTHOR( DRIVER_AUTHOR );
2213 MODULE_DESCRIPTION( DRIVER_DESC );
2214 MODULE_LICENSE("GPL");
2215
2216 module_param(debug, bool, S_IRUGO | S_IWUSR);
2217 MODULE_PARM_DESC(debug, "Debug enabled or not");
2218 module_param(vendor, ushort, 0);
2219 MODULE_PARM_DESC(vendor, "User specified vendor ID (default="
2220 __MODULE_STRING(FTDI_VID)")");
2221 module_param(product, ushort, 0);
2222 MODULE_PARM_DESC(vendor, "User specified product ID");
2223
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree