xref: /linux/drivers/usb/serial/ftdi_sio.c (revision 2b8232ce512105e28453f301d1510de8363bccd1)
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 G�hring'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_private {
275 	ftdi_chip_type_t chip_type;
276 				/* type of the device, either SIO or FT8U232AM */
277 	int baud_base;		/* baud base clock for divisor setting */
278 	int custom_divisor;	/* custom_divisor kludge, this is for baud_base (different from what goes to the chip!) */
279 	__u16 last_set_data_urb_value ;
280 				/* the last data state set - needed for doing a break */
281         int write_offset;       /* This is the offset in the usb data block to write the serial data -
282 				 * it is different between devices
283 				 */
284 	int flags;		/* some ASYNC_xxxx flags are supported */
285 	unsigned long last_dtr_rts;	/* saved modem control outputs */
286         wait_queue_head_t delta_msr_wait; /* Used for TIOCMIWAIT */
287 	char prev_status, diff_status;        /* Used for TIOCMIWAIT */
288 	__u8 rx_flags;		/* receive state flags (throttling) */
289 	spinlock_t rx_lock;	/* spinlock for receive state */
290 	struct delayed_work rx_work;
291 	struct usb_serial_port *port;
292 	int rx_processed;
293 	unsigned long rx_bytes;
294 
295 	__u16 interface;	/* FT2232C port interface (0 for FT232/245) */
296 
297 	int force_baud;		/* if non-zero, force the baud rate to this value */
298 	int force_rtscts;	/* if non-zero, force RTS-CTS to always be enabled */
299 
300 	spinlock_t tx_lock;	/* spinlock for transmit state */
301 	unsigned long tx_bytes;
302 	unsigned long tx_outstanding_bytes;
303 	unsigned long tx_outstanding_urbs;
304 };
305 
306 /* struct ftdi_sio_quirk is used by devices requiring special attention. */
307 struct ftdi_sio_quirk {
308 	int (*probe)(struct usb_serial *);
309 	void (*port_probe)(struct ftdi_private *); /* Special settings for probed ports. */
310 };
311 
312 static int   ftdi_olimex_probe		(struct usb_serial *serial);
313 static void  ftdi_USB_UIRT_setup	(struct ftdi_private *priv);
314 static void  ftdi_HE_TIRA1_setup	(struct ftdi_private *priv);
315 
316 static struct ftdi_sio_quirk ftdi_olimex_quirk = {
317 	.probe	= ftdi_olimex_probe,
318 };
319 
320 static struct ftdi_sio_quirk ftdi_USB_UIRT_quirk = {
321 	.port_probe = ftdi_USB_UIRT_setup,
322 };
323 
324 static struct ftdi_sio_quirk ftdi_HE_TIRA1_quirk = {
325 	.port_probe = ftdi_HE_TIRA1_setup,
326 };
327 
328 /*
329  * The 8U232AM has the same API as the sio except for:
330  * - it can support MUCH higher baudrates; up to:
331  *   o 921600 for RS232 and 2000000 for RS422/485 at 48MHz
332  *   o 230400 at 12MHz
333  *   so .. 8U232AM's baudrate setting codes are different
334  * - it has a two byte status code.
335  * - it returns characters every 16ms (the FTDI does it every 40ms)
336  *
337  * the bcdDevice value is used to differentiate FT232BM and FT245BM from
338  * the earlier FT8U232AM and FT8U232BM.  For now, include all known VID/PID
339  * combinations in both tables.
340  * FIXME: perhaps bcdDevice can also identify 12MHz FT8U232AM devices,
341  * but I don't know if those ever went into mass production. [Ian Abbott]
342  */
343 
344 
345 
346 static struct usb_device_id id_table_combined [] = {
347 	{ USB_DEVICE(FTDI_VID, FTDI_AMC232_PID) },
348 	{ USB_DEVICE(FTDI_VID, FTDI_CANUSB_PID) },
349 	{ USB_DEVICE(FTDI_VID, FTDI_ACTZWAVE_PID) },
350 	{ USB_DEVICE(FTDI_VID, FTDI_IRTRANS_PID) },
351 	{ USB_DEVICE(FTDI_VID, FTDI_IPLUS_PID) },
352 	{ USB_DEVICE(FTDI_VID, FTDI_IPLUS2_PID) },
353 	{ USB_DEVICE(FTDI_VID, FTDI_DMX4ALL) },
354 	{ USB_DEVICE(FTDI_VID, FTDI_SIO_PID) },
355 	{ USB_DEVICE(FTDI_VID, FTDI_8U232AM_PID) },
356 	{ USB_DEVICE(FTDI_VID, FTDI_8U232AM_ALT_PID) },
357 	{ USB_DEVICE(FTDI_VID, FTDI_232RL_PID) },
358 	{ USB_DEVICE(FTDI_VID, FTDI_8U2232C_PID) },
359 	{ USB_DEVICE(FTDI_VID, FTDI_MICRO_CHAMELEON_PID) },
360 	{ USB_DEVICE(FTDI_VID, FTDI_RELAIS_PID) },
361 	{ USB_DEVICE(FTDI_VID, FTDI_OPENDCC_PID) },
362 	{ USB_DEVICE(INTERBIOMETRICS_VID, INTERBIOMETRICS_IOBOARD_PID) },
363 	{ USB_DEVICE(INTERBIOMETRICS_VID, INTERBIOMETRICS_MINI_IOBOARD_PID) },
364 	{ USB_DEVICE(FTDI_VID, FTDI_XF_632_PID) },
365 	{ USB_DEVICE(FTDI_VID, FTDI_XF_634_PID) },
366 	{ USB_DEVICE(FTDI_VID, FTDI_XF_547_PID) },
367 	{ USB_DEVICE(FTDI_VID, FTDI_XF_633_PID) },
368 	{ USB_DEVICE(FTDI_VID, FTDI_XF_631_PID) },
369 	{ USB_DEVICE(FTDI_VID, FTDI_XF_635_PID) },
370 	{ USB_DEVICE(FTDI_VID, FTDI_XF_640_PID) },
371 	{ USB_DEVICE(FTDI_VID, FTDI_XF_642_PID) },
372 	{ USB_DEVICE(FTDI_VID, FTDI_DSS20_PID) },
373 	{ USB_DEVICE(FTDI_NF_RIC_VID, FTDI_NF_RIC_PID) },
374 	{ USB_DEVICE(FTDI_VID, FTDI_VNHCPCUSB_D_PID) },
375 	{ USB_DEVICE(FTDI_VID, FTDI_MTXORB_0_PID) },
376 	{ USB_DEVICE(FTDI_VID, FTDI_MTXORB_1_PID) },
377 	{ USB_DEVICE(FTDI_VID, FTDI_MTXORB_2_PID) },
378 	{ USB_DEVICE(FTDI_VID, FTDI_MTXORB_3_PID) },
379 	{ USB_DEVICE(FTDI_VID, FTDI_MTXORB_4_PID) },
380 	{ USB_DEVICE(FTDI_VID, FTDI_MTXORB_5_PID) },
381 	{ USB_DEVICE(FTDI_VID, FTDI_MTXORB_6_PID) },
382 	{ USB_DEVICE(FTDI_VID, FTDI_PERLE_ULTRAPORT_PID) },
383 	{ USB_DEVICE(FTDI_VID, FTDI_PIEGROUP_PID) },
384 	{ USB_DEVICE(FTDI_VID, FTDI_TNC_X_PID) },
385 	{ USB_DEVICE(FTDI_VID, FTDI_USBX_707_PID) },
386 	{ USB_DEVICE(SEALEVEL_VID, SEALEVEL_2101_PID) },
387 	{ USB_DEVICE(SEALEVEL_VID, SEALEVEL_2102_PID) },
388 	{ USB_DEVICE(SEALEVEL_VID, SEALEVEL_2103_PID) },
389 	{ USB_DEVICE(SEALEVEL_VID, SEALEVEL_2104_PID) },
390 	{ USB_DEVICE(SEALEVEL_VID, SEALEVEL_2106_PID) },
391 	{ USB_DEVICE(SEALEVEL_VID, SEALEVEL_2201_1_PID) },
392 	{ USB_DEVICE(SEALEVEL_VID, SEALEVEL_2201_2_PID) },
393 	{ USB_DEVICE(SEALEVEL_VID, SEALEVEL_2202_1_PID) },
394 	{ USB_DEVICE(SEALEVEL_VID, SEALEVEL_2202_2_PID) },
395 	{ USB_DEVICE(SEALEVEL_VID, SEALEVEL_2203_1_PID) },
396 	{ USB_DEVICE(SEALEVEL_VID, SEALEVEL_2203_2_PID) },
397 	{ USB_DEVICE(SEALEVEL_VID, SEALEVEL_2401_1_PID) },
398 	{ USB_DEVICE(SEALEVEL_VID, SEALEVEL_2401_2_PID) },
399 	{ USB_DEVICE(SEALEVEL_VID, SEALEVEL_2401_3_PID) },
400 	{ USB_DEVICE(SEALEVEL_VID, SEALEVEL_2401_4_PID) },
401 	{ USB_DEVICE(SEALEVEL_VID, SEALEVEL_2402_1_PID) },
402 	{ USB_DEVICE(SEALEVEL_VID, SEALEVEL_2402_2_PID) },
403 	{ USB_DEVICE(SEALEVEL_VID, SEALEVEL_2402_3_PID) },
404 	{ USB_DEVICE(SEALEVEL_VID, SEALEVEL_2402_4_PID) },
405 	{ USB_DEVICE(SEALEVEL_VID, SEALEVEL_2403_1_PID) },
406 	{ USB_DEVICE(SEALEVEL_VID, SEALEVEL_2403_2_PID) },
407 	{ USB_DEVICE(SEALEVEL_VID, SEALEVEL_2403_3_PID) },
408 	{ USB_DEVICE(SEALEVEL_VID, SEALEVEL_2403_4_PID) },
409 	{ USB_DEVICE(SEALEVEL_VID, SEALEVEL_2801_1_PID) },
410 	{ USB_DEVICE(SEALEVEL_VID, SEALEVEL_2801_2_PID) },
411 	{ USB_DEVICE(SEALEVEL_VID, SEALEVEL_2801_3_PID) },
412 	{ USB_DEVICE(SEALEVEL_VID, SEALEVEL_2801_4_PID) },
413 	{ USB_DEVICE(SEALEVEL_VID, SEALEVEL_2801_5_PID) },
414 	{ USB_DEVICE(SEALEVEL_VID, SEALEVEL_2801_6_PID) },
415 	{ USB_DEVICE(SEALEVEL_VID, SEALEVEL_2801_7_PID) },
416 	{ USB_DEVICE(SEALEVEL_VID, SEALEVEL_2801_8_PID) },
417 	{ USB_DEVICE(SEALEVEL_VID, SEALEVEL_2802_1_PID) },
418 	{ USB_DEVICE(SEALEVEL_VID, SEALEVEL_2802_2_PID) },
419 	{ USB_DEVICE(SEALEVEL_VID, SEALEVEL_2802_3_PID) },
420 	{ USB_DEVICE(SEALEVEL_VID, SEALEVEL_2802_4_PID) },
421 	{ USB_DEVICE(SEALEVEL_VID, SEALEVEL_2802_5_PID) },
422 	{ USB_DEVICE(SEALEVEL_VID, SEALEVEL_2802_6_PID) },
423 	{ USB_DEVICE(SEALEVEL_VID, SEALEVEL_2802_7_PID) },
424 	{ USB_DEVICE(SEALEVEL_VID, SEALEVEL_2802_8_PID) },
425 	{ USB_DEVICE(SEALEVEL_VID, SEALEVEL_2803_1_PID) },
426 	{ USB_DEVICE(SEALEVEL_VID, SEALEVEL_2803_2_PID) },
427 	{ USB_DEVICE(SEALEVEL_VID, SEALEVEL_2803_3_PID) },
428 	{ USB_DEVICE(SEALEVEL_VID, SEALEVEL_2803_4_PID) },
429 	{ USB_DEVICE(SEALEVEL_VID, SEALEVEL_2803_5_PID) },
430 	{ USB_DEVICE(SEALEVEL_VID, SEALEVEL_2803_6_PID) },
431 	{ USB_DEVICE(SEALEVEL_VID, SEALEVEL_2803_7_PID) },
432 	{ USB_DEVICE(SEALEVEL_VID, SEALEVEL_2803_8_PID) },
433 	{ USB_DEVICE(IDTECH_VID, IDTECH_IDT1221U_PID) },
434 	{ USB_DEVICE(OCT_VID, OCT_US101_PID) },
435 	{ USB_DEVICE(FTDI_VID, FTDI_HE_TIRA1_PID),
436 		.driver_info = (kernel_ulong_t)&ftdi_HE_TIRA1_quirk },
437 	{ USB_DEVICE(FTDI_VID, FTDI_USB_UIRT_PID),
438 		.driver_info = (kernel_ulong_t)&ftdi_USB_UIRT_quirk },
439 	{ USB_DEVICE(FTDI_VID, PROTEGO_SPECIAL_1) },
440 	{ USB_DEVICE(FTDI_VID, PROTEGO_R2X0) },
441 	{ USB_DEVICE(FTDI_VID, PROTEGO_SPECIAL_3) },
442 	{ USB_DEVICE(FTDI_VID, PROTEGO_SPECIAL_4) },
443 	{ USB_DEVICE(FTDI_VID, FTDI_GUDEADS_E808_PID) },
444 	{ USB_DEVICE(FTDI_VID, FTDI_GUDEADS_E809_PID) },
445 	{ USB_DEVICE(FTDI_VID, FTDI_GUDEADS_E80A_PID) },
446 	{ USB_DEVICE(FTDI_VID, FTDI_GUDEADS_E80B_PID) },
447 	{ USB_DEVICE(FTDI_VID, FTDI_GUDEADS_E80C_PID) },
448 	{ USB_DEVICE(FTDI_VID, FTDI_GUDEADS_E80D_PID) },
449 	{ USB_DEVICE(FTDI_VID, FTDI_GUDEADS_E80E_PID) },
450 	{ USB_DEVICE(FTDI_VID, FTDI_GUDEADS_E80F_PID) },
451 	{ USB_DEVICE(FTDI_VID, FTDI_GUDEADS_E888_PID) },
452 	{ USB_DEVICE(FTDI_VID, FTDI_GUDEADS_E889_PID) },
453 	{ USB_DEVICE(FTDI_VID, FTDI_GUDEADS_E88A_PID) },
454 	{ USB_DEVICE(FTDI_VID, FTDI_GUDEADS_E88B_PID) },
455 	{ USB_DEVICE(FTDI_VID, FTDI_GUDEADS_E88C_PID) },
456 	{ USB_DEVICE(FTDI_VID, FTDI_GUDEADS_E88D_PID) },
457 	{ USB_DEVICE(FTDI_VID, FTDI_GUDEADS_E88E_PID) },
458 	{ USB_DEVICE(FTDI_VID, FTDI_GUDEADS_E88F_PID) },
459 	{ USB_DEVICE(FTDI_VID, FTDI_ELV_UO100_PID) },
460 	{ USB_DEVICE(FTDI_VID, FTDI_ELV_UM100_PID) },
461 	{ USB_DEVICE(FTDI_VID, FTDI_ELV_UR100_PID) },
462 	{ USB_DEVICE(FTDI_VID, FTDI_ELV_ALC8500_PID) },
463 	{ USB_DEVICE(FTDI_VID, FTDI_PYRAMID_PID) },
464 	{ USB_DEVICE(FTDI_VID, FTDI_ELV_FHZ1000PC_PID) },
465 	{ USB_DEVICE(FTDI_VID, FTDI_IBS_US485_PID) },
466 	{ USB_DEVICE(FTDI_VID, FTDI_IBS_PICPRO_PID) },
467 	{ USB_DEVICE(FTDI_VID, FTDI_IBS_PCMCIA_PID) },
468 	{ USB_DEVICE(FTDI_VID, FTDI_IBS_PK1_PID) },
469 	{ USB_DEVICE(FTDI_VID, FTDI_IBS_RS232MON_PID) },
470 	{ USB_DEVICE(FTDI_VID, FTDI_IBS_APP70_PID) },
471 	{ USB_DEVICE(FTDI_VID, FTDI_IBS_PEDO_PID) },
472 	{ USB_DEVICE(FTDI_VID, FTDI_IBS_PROD_PID) },
473 	/*
474 	 * These will probably use user-space drivers.  Uncomment them if
475 	 * you need them or use the user-specified vendor/product module
476 	 * parameters (see ftdi_sio.h for the numbers).  Make a fuss if
477 	 * you think the driver should recognize any of them by default.
478 	 */
479 	/* { USB_DEVICE(FTDI_VID, FTDI_ELV_CLI7000_PID) }, */
480 	/* { USB_DEVICE(FTDI_VID, FTDI_ELV_PPS7330_PID) }, */
481 	/* { USB_DEVICE(FTDI_VID, FTDI_ELV_TFM100_PID) }, */
482 	/* { USB_DEVICE(FTDI_VID, FTDI_ELV_UDF77_PID) }, */
483 	/* { USB_DEVICE(FTDI_VID, FTDI_ELV_UIO88_PID) }, */
484 	/* { USB_DEVICE(FTDI_VID, FTDI_ELV_UAD8_PID) }, */
485 	/* { USB_DEVICE(FTDI_VID, FTDI_ELV_UDA7_PID) }, */
486 	/* { USB_DEVICE(FTDI_VID, FTDI_ELV_USI2_PID) }, */
487 	/* { USB_DEVICE(FTDI_VID, FTDI_ELV_T1100_PID) }, */
488 	/* { USB_DEVICE(FTDI_VID, FTDI_ELV_PCD200_PID) }, */
489 	/* { USB_DEVICE(FTDI_VID, FTDI_ELV_ULA200_PID) }, */
490 	/* { USB_DEVICE(FTDI_VID, FTDI_ELV_CSI8_PID) }, */
491 	/* { USB_DEVICE(FTDI_VID, FTDI_ELV_EM1000DL_PID) }, */
492 	/* { USB_DEVICE(FTDI_VID, FTDI_ELV_PCK100_PID) }, */
493 	/* { USB_DEVICE(FTDI_VID, FTDI_ELV_RFP500_PID) }, */
494 	/* { USB_DEVICE(FTDI_VID, FTDI_ELV_FS20SIG_PID) }, */
495 	/* { USB_DEVICE(FTDI_VID, FTDI_ELV_WS300PC_PID) }, */
496 	/* { USB_DEVICE(FTDI_VID, FTDI_ELV_FHZ1300PC_PID) }, */
497 	/* { USB_DEVICE(FTDI_VID, FTDI_ELV_WS500_PID) }, */
498 	{ USB_DEVICE(FTDI_VID, LINX_SDMUSBQSS_PID) },
499 	{ USB_DEVICE(FTDI_VID, LINX_MASTERDEVEL2_PID) },
500 	{ USB_DEVICE(FTDI_VID, LINX_FUTURE_0_PID) },
501 	{ USB_DEVICE(FTDI_VID, LINX_FUTURE_1_PID) },
502 	{ USB_DEVICE(FTDI_VID, LINX_FUTURE_2_PID) },
503 	{ USB_DEVICE(FTDI_VID, FTDI_CCSICDU20_0_PID) },
504 	{ USB_DEVICE(FTDI_VID, FTDI_CCSICDU40_1_PID) },
505 	{ USB_DEVICE(FTDI_VID, FTDI_CCSMACHX_2_PID) },
506 	{ USB_DEVICE(FTDI_VID, INSIDE_ACCESSO) },
507 	{ USB_DEVICE(INTREPID_VID, INTREPID_VALUECAN_PID) },
508 	{ USB_DEVICE(INTREPID_VID, INTREPID_NEOVI_PID) },
509 	{ USB_DEVICE(FALCOM_VID, FALCOM_TWIST_PID) },
510 	{ USB_DEVICE(FALCOM_VID, FALCOM_SAMBA_PID) },
511 	{ USB_DEVICE(FTDI_VID, FTDI_SUUNTO_SPORTS_PID) },
512 	{ USB_DEVICE(TTI_VID, TTI_QL355P_PID) },
513 	{ USB_DEVICE(FTDI_VID, FTDI_RM_CANVIEW_PID) },
514 	{ USB_DEVICE(BANDB_VID, BANDB_USOTL4_PID) },
515 	{ USB_DEVICE(BANDB_VID, BANDB_USTL4_PID) },
516 	{ USB_DEVICE(BANDB_VID, BANDB_USO9ML2_PID) },
517 	{ USB_DEVICE(FTDI_VID, EVER_ECO_PRO_CDS) },
518 	{ USB_DEVICE(FTDI_VID, FTDI_4N_GALAXY_DE_1_PID) },
519 	{ USB_DEVICE(FTDI_VID, FTDI_4N_GALAXY_DE_2_PID) },
520 	{ USB_DEVICE(FTDI_VID, XSENS_CONVERTER_0_PID) },
521 	{ USB_DEVICE(FTDI_VID, XSENS_CONVERTER_1_PID) },
522 	{ USB_DEVICE(FTDI_VID, XSENS_CONVERTER_2_PID) },
523 	{ USB_DEVICE(FTDI_VID, XSENS_CONVERTER_3_PID) },
524 	{ USB_DEVICE(FTDI_VID, XSENS_CONVERTER_4_PID) },
525 	{ USB_DEVICE(FTDI_VID, XSENS_CONVERTER_5_PID) },
526 	{ USB_DEVICE(FTDI_VID, XSENS_CONVERTER_6_PID) },
527 	{ USB_DEVICE(FTDI_VID, XSENS_CONVERTER_7_PID) },
528 	{ USB_DEVICE(MOBILITY_VID, MOBILITY_USB_SERIAL_PID) },
529 	{ USB_DEVICE(FTDI_VID, FTDI_ACTIVE_ROBOTS_PID) },
530 	{ USB_DEVICE(FTDI_VID, FTDI_MHAM_KW_PID) },
531 	{ USB_DEVICE(FTDI_VID, FTDI_MHAM_YS_PID) },
532 	{ USB_DEVICE(FTDI_VID, FTDI_MHAM_Y6_PID) },
533 	{ USB_DEVICE(FTDI_VID, FTDI_MHAM_Y8_PID) },
534 	{ USB_DEVICE(FTDI_VID, FTDI_MHAM_IC_PID) },
535 	{ USB_DEVICE(FTDI_VID, FTDI_MHAM_DB9_PID) },
536 	{ USB_DEVICE(FTDI_VID, FTDI_MHAM_RS232_PID) },
537 	{ USB_DEVICE(FTDI_VID, FTDI_MHAM_Y9_PID) },
538 	{ USB_DEVICE(FTDI_VID, FTDI_TERATRONIK_VCP_PID) },
539 	{ USB_DEVICE(FTDI_VID, FTDI_TERATRONIK_D2XX_PID) },
540 	{ USB_DEVICE(EVOLUTION_VID, EVOLUTION_ER1_PID) },
541 	{ USB_DEVICE(EVOLUTION_VID, EVO_HYBRID_PID) },
542 	{ USB_DEVICE(EVOLUTION_VID, EVO_RCM4_PID) },
543 	{ USB_DEVICE(FTDI_VID, FTDI_ARTEMIS_PID) },
544 	{ USB_DEVICE(FTDI_VID, FTDI_ATIK_ATK16_PID) },
545 	{ USB_DEVICE(FTDI_VID, FTDI_ATIK_ATK16C_PID) },
546 	{ USB_DEVICE(FTDI_VID, FTDI_ATIK_ATK16HR_PID) },
547 	{ USB_DEVICE(FTDI_VID, FTDI_ATIK_ATK16HRC_PID) },
548 	{ USB_DEVICE(KOBIL_VID, KOBIL_CONV_B1_PID) },
549 	{ USB_DEVICE(KOBIL_VID, KOBIL_CONV_KAAN_PID) },
550 	{ USB_DEVICE(POSIFLEX_VID, POSIFLEX_PP7000_PID) },
551 	{ USB_DEVICE(FTDI_VID, FTDI_TTUSB_PID) },
552 	{ USB_DEVICE(FTDI_VID, FTDI_ECLO_COM_1WIRE_PID) },
553 	{ USB_DEVICE(FTDI_VID, FTDI_WESTREX_MODEL_777_PID) },
554 	{ USB_DEVICE(FTDI_VID, FTDI_WESTREX_MODEL_8900F_PID) },
555 	{ USB_DEVICE(FTDI_VID, FTDI_PCDJ_DAC2_PID) },
556 	{ USB_DEVICE(FTDI_VID, FTDI_RRCIRKITS_LOCOBUFFER_PID) },
557 	{ USB_DEVICE(FTDI_VID, FTDI_ASK_RDR400_PID) },
558 	{ USB_DEVICE(ICOM_ID1_VID, ICOM_ID1_PID) },
559 	{ USB_DEVICE(PAPOUCH_VID, PAPOUCH_TMU_PID) },
560 	{ USB_DEVICE(FTDI_VID, FTDI_ACG_HFDUAL_PID) },
561 	{ USB_DEVICE(FTDI_VID, FTDI_YEI_SERVOCENTER31_PID) },
562 	{ USB_DEVICE(FTDI_VID, FTDI_THORLABS_PID) },
563 	{ USB_DEVICE(TESTO_VID, TESTO_USB_INTERFACE_PID) },
564 	{ USB_DEVICE(FTDI_VID, FTDI_GAMMA_SCOUT_PID) },
565 	{ USB_DEVICE(FTDI_VID, FTDI_TACTRIX_OPENPORT_13M_PID) },
566 	{ USB_DEVICE(FTDI_VID, FTDI_TACTRIX_OPENPORT_13S_PID) },
567 	{ USB_DEVICE(FTDI_VID, FTDI_TACTRIX_OPENPORT_13U_PID) },
568 	{ USB_DEVICE(ELEKTOR_VID, ELEKTOR_FT323R_PID) },
569 	{ USB_DEVICE(TELLDUS_VID, TELLDUS_TELLSTICK_PID) },
570 	{ USB_DEVICE(FTDI_VID, FTDI_MAXSTREAM_PID) },
571 	{ USB_DEVICE(TML_VID, TML_USB_SERIAL_PID) },
572 	{ USB_DEVICE(OLIMEX_VID, OLIMEX_ARM_USB_OCD_PID),
573 		.driver_info = (kernel_ulong_t)&ftdi_olimex_quirk },
574 	{ },					/* Optional parameter entry */
575 	{ }					/* Terminating entry */
576 };
577 
578 MODULE_DEVICE_TABLE (usb, id_table_combined);
579 
580 static struct usb_driver ftdi_driver = {
581 	.name =		"ftdi_sio",
582 	.probe =	usb_serial_probe,
583 	.disconnect =	usb_serial_disconnect,
584 	.id_table =	id_table_combined,
585 	.no_dynamic_id =	1,
586 };
587 
588 static const char *ftdi_chip_name[] = {
589 	[SIO] = "SIO",	/* the serial part of FT8U100AX */
590 	[FT8U232AM] = "FT8U232AM",
591 	[FT232BM] = "FT232BM",
592 	[FT2232C] = "FT2232C",
593 	[FT232RL] = "FT232RL",
594 };
595 
596 
597 /* Constants for read urb and write urb */
598 #define BUFSZ 512
599 #define PKTSZ 64
600 
601 /* rx_flags */
602 #define THROTTLED		0x01
603 #define ACTUALLY_THROTTLED	0x02
604 
605 /* Used for TIOCMIWAIT */
606 #define FTDI_STATUS_B0_MASK	(FTDI_RS0_CTS | FTDI_RS0_DSR | FTDI_RS0_RI | FTDI_RS0_RLSD)
607 #define FTDI_STATUS_B1_MASK	(FTDI_RS_BI)
608 /* End TIOCMIWAIT */
609 
610 #define FTDI_IMPL_ASYNC_FLAGS = ( ASYNC_SPD_HI | ASYNC_SPD_VHI \
611  ASYNC_SPD_CUST | ASYNC_SPD_SHI | ASYNC_SPD_WARP )
612 
613 /* function prototypes for a FTDI serial converter */
614 static int  ftdi_sio_probe	(struct usb_serial *serial, const struct usb_device_id *id);
615 static void ftdi_shutdown		(struct usb_serial *serial);
616 static int  ftdi_sio_port_probe	(struct usb_serial_port *port);
617 static int  ftdi_sio_port_remove	(struct usb_serial_port *port);
618 static int  ftdi_open			(struct usb_serial_port *port, struct file *filp);
619 static void ftdi_close			(struct usb_serial_port *port, struct file *filp);
620 static int  ftdi_write			(struct usb_serial_port *port, const unsigned char *buf, int count);
621 static int  ftdi_write_room		(struct usb_serial_port *port);
622 static int  ftdi_chars_in_buffer	(struct usb_serial_port *port);
623 static void ftdi_write_bulk_callback	(struct urb *urb);
624 static void ftdi_read_bulk_callback	(struct urb *urb);
625 static void ftdi_process_read		(struct work_struct *work);
626 static void ftdi_set_termios		(struct usb_serial_port *port, struct ktermios * old);
627 static int  ftdi_tiocmget               (struct usb_serial_port *port, struct file *file);
628 static int  ftdi_tiocmset		(struct usb_serial_port *port, struct file * file, unsigned int set, unsigned int clear);
629 static int  ftdi_ioctl			(struct usb_serial_port *port, struct file * file, unsigned int cmd, unsigned long arg);
630 static void ftdi_break_ctl		(struct usb_serial_port *port, int break_state );
631 static void ftdi_throttle		(struct usb_serial_port *port);
632 static void ftdi_unthrottle		(struct usb_serial_port *port);
633 
634 static unsigned short int ftdi_232am_baud_base_to_divisor (int baud, int base);
635 static unsigned short int ftdi_232am_baud_to_divisor (int baud);
636 static __u32 ftdi_232bm_baud_base_to_divisor (int baud, int base);
637 static __u32 ftdi_232bm_baud_to_divisor (int baud);
638 
639 static struct usb_serial_driver ftdi_sio_device = {
640 	.driver = {
641 		.owner =	THIS_MODULE,
642 		.name =		"ftdi_sio",
643 	},
644 	.description =		"FTDI USB Serial Device",
645 	.usb_driver = 		&ftdi_driver ,
646 	.id_table =		id_table_combined,
647 	.num_interrupt_in =	0,
648 	.num_bulk_in =		1,
649 	.num_bulk_out =		1,
650 	.num_ports =		1,
651 	.probe =		ftdi_sio_probe,
652 	.port_probe =		ftdi_sio_port_probe,
653 	.port_remove =		ftdi_sio_port_remove,
654 	.open =			ftdi_open,
655 	.close =		ftdi_close,
656 	.throttle =		ftdi_throttle,
657 	.unthrottle =		ftdi_unthrottle,
658 	.write =		ftdi_write,
659 	.write_room =		ftdi_write_room,
660 	.chars_in_buffer =	ftdi_chars_in_buffer,
661 	.read_bulk_callback =	ftdi_read_bulk_callback,
662 	.write_bulk_callback =	ftdi_write_bulk_callback,
663 	.tiocmget =             ftdi_tiocmget,
664 	.tiocmset =             ftdi_tiocmset,
665 	.ioctl =		ftdi_ioctl,
666 	.set_termios =		ftdi_set_termios,
667 	.break_ctl =		ftdi_break_ctl,
668 	.shutdown =		ftdi_shutdown,
669 };
670 
671 
672 #define WDR_TIMEOUT 5000 /* default urb timeout */
673 #define WDR_SHORT_TIMEOUT 1000	/* shorter urb timeout */
674 
675 /* High and low are for DTR, RTS etc etc */
676 #define HIGH 1
677 #define LOW 0
678 
679 /* number of outstanding urbs to prevent userspace DoS from happening */
680 #define URB_UPPER_LIMIT	42
681 
682 /*
683  * ***************************************************************************
684  * Utility functions
685  * ***************************************************************************
686  */
687 
688 static unsigned short int ftdi_232am_baud_base_to_divisor(int baud, int base)
689 {
690 	unsigned short int divisor;
691 	int divisor3 = base / 2 / baud; // divisor shifted 3 bits to the left
692 	if ((divisor3 & 0x7) == 7) divisor3 ++; // round x.7/8 up to x+1
693 	divisor = divisor3 >> 3;
694 	divisor3 &= 0x7;
695 	if (divisor3 == 1) divisor |= 0xc000; else // 0.125
696 	if (divisor3 >= 4) divisor |= 0x4000; else // 0.5
697 	if (divisor3 != 0) divisor |= 0x8000;      // 0.25
698 	if (divisor == 1) divisor = 0;	/* special case for maximum baud rate */
699 	return divisor;
700 }
701 
702 static unsigned short int ftdi_232am_baud_to_divisor(int baud)
703 {
704 	 return(ftdi_232am_baud_base_to_divisor(baud, 48000000));
705 }
706 
707 static __u32 ftdi_232bm_baud_base_to_divisor(int baud, int base)
708 {
709 	static const unsigned char divfrac[8] = { 0, 3, 2, 4, 1, 5, 6, 7 };
710 	__u32 divisor;
711 	int divisor3 = base / 2 / baud; // divisor shifted 3 bits to the left
712 	divisor = divisor3 >> 3;
713 	divisor |= (__u32)divfrac[divisor3 & 0x7] << 14;
714 	/* Deal with special cases for highest baud rates. */
715 	if (divisor == 1) divisor = 0; else	// 1.0
716 	if (divisor == 0x4001) divisor = 1;	// 1.5
717 	return divisor;
718 }
719 
720 static __u32 ftdi_232bm_baud_to_divisor(int baud)
721 {
722 	 return(ftdi_232bm_baud_base_to_divisor(baud, 48000000));
723 }
724 
725 #define set_mctrl(port, set)		update_mctrl((port), (set), 0)
726 #define clear_mctrl(port, clear)	update_mctrl((port), 0, (clear))
727 
728 static int update_mctrl(struct usb_serial_port *port, unsigned int set, unsigned int clear)
729 {
730 	struct ftdi_private *priv = usb_get_serial_port_data(port);
731 	char *buf;
732 	unsigned urb_value;
733 	int rv;
734 
735 	if (((set | clear) & (TIOCM_DTR | TIOCM_RTS)) == 0) {
736 		dbg("%s - DTR|RTS not being set|cleared", __FUNCTION__);
737 		return 0;	/* no change */
738 	}
739 
740 	buf = kmalloc(1, GFP_NOIO);
741 	if (!buf) {
742 		return -ENOMEM;
743 	}
744 
745 	clear &= ~set;	/* 'set' takes precedence over 'clear' */
746 	urb_value = 0;
747 	if (clear & TIOCM_DTR)
748 		urb_value |= FTDI_SIO_SET_DTR_LOW;
749 	if (clear & TIOCM_RTS)
750 		urb_value |= FTDI_SIO_SET_RTS_LOW;
751 	if (set & TIOCM_DTR)
752 		urb_value |= FTDI_SIO_SET_DTR_HIGH;
753 	if (set & TIOCM_RTS)
754 		urb_value |= FTDI_SIO_SET_RTS_HIGH;
755 	rv = usb_control_msg(port->serial->dev,
756 			       usb_sndctrlpipe(port->serial->dev, 0),
757 			       FTDI_SIO_SET_MODEM_CTRL_REQUEST,
758 			       FTDI_SIO_SET_MODEM_CTRL_REQUEST_TYPE,
759 			       urb_value, priv->interface,
760 			       buf, 0, WDR_TIMEOUT);
761 
762 	kfree(buf);
763 	if (rv < 0) {
764 		err("%s Error from MODEM_CTRL urb: DTR %s, RTS %s",
765 				__FUNCTION__,
766 				(set & TIOCM_DTR) ? "HIGH" :
767 				(clear & TIOCM_DTR) ? "LOW" : "unchanged",
768 				(set & TIOCM_RTS) ? "HIGH" :
769 				(clear & TIOCM_RTS) ? "LOW" : "unchanged");
770 	} else {
771 		dbg("%s - DTR %s, RTS %s", __FUNCTION__,
772 				(set & TIOCM_DTR) ? "HIGH" :
773 				(clear & TIOCM_DTR) ? "LOW" : "unchanged",
774 				(set & TIOCM_RTS) ? "HIGH" :
775 				(clear & TIOCM_RTS) ? "LOW" : "unchanged");
776 		priv->last_dtr_rts = (priv->last_dtr_rts & ~clear) | set;
777 	}
778 	return rv;
779 }
780 
781 
782 static __u32 get_ftdi_divisor(struct usb_serial_port * port);
783 
784 
785 static int change_speed(struct usb_serial_port *port)
786 {
787 	struct ftdi_private *priv = usb_get_serial_port_data(port);
788 	char *buf;
789         __u16 urb_value;
790 	__u16 urb_index;
791 	__u32 urb_index_value;
792 	int rv;
793 
794 	buf = kmalloc(1, GFP_NOIO);
795 	if (!buf)
796 		return -ENOMEM;
797 
798 	urb_index_value = get_ftdi_divisor(port);
799 	urb_value = (__u16)urb_index_value;
800 	urb_index = (__u16)(urb_index_value >> 16);
801 	if (priv->interface) {	/* FT2232C */
802 		urb_index = (__u16)((urb_index << 8) | priv->interface);
803 	}
804 
805 	rv = usb_control_msg(port->serial->dev,
806 			    usb_sndctrlpipe(port->serial->dev, 0),
807 			    FTDI_SIO_SET_BAUDRATE_REQUEST,
808 			    FTDI_SIO_SET_BAUDRATE_REQUEST_TYPE,
809 			    urb_value, urb_index,
810 			    buf, 0, WDR_SHORT_TIMEOUT);
811 
812 	kfree(buf);
813 	return rv;
814 }
815 
816 
817 static __u32 get_ftdi_divisor(struct usb_serial_port * port)
818 { /* get_ftdi_divisor */
819 	struct ftdi_private *priv = usb_get_serial_port_data(port);
820 	__u32 div_value = 0;
821 	int div_okay = 1;
822 	int baud;
823 
824 	/*
825 	 * The logic involved in setting the baudrate can be cleanly split in 3 steps.
826 	 * Obtaining the actual baud rate is a little tricky since unix traditionally
827 	 * somehow ignored the possibility to set non-standard baud rates.
828 	 * 1. Standard baud rates are set in tty->termios->c_cflag
829 	 * 2. If these are not enough, you can set any speed using alt_speed as follows:
830 	 *    - set tty->termios->c_cflag speed to B38400
831 	 *    - set your real speed in tty->alt_speed; it gets ignored when
832 	 *      alt_speed==0, (or)
833 	 *    - call TIOCSSERIAL ioctl with (struct serial_struct) set as follows:
834 	 *      flags & ASYNC_SPD_MASK == ASYNC_SPD_[HI, VHI, SHI, WARP], this just
835 	 *      sets alt_speed to (HI: 57600, VHI: 115200, SHI: 230400, WARP: 460800)
836 	 * ** Steps 1, 2 are done courtesy of tty_get_baud_rate
837 	 * 3. You can also set baud rate by setting custom divisor as follows
838 	 *    - set tty->termios->c_cflag speed to B38400
839 	 *    - call TIOCSSERIAL ioctl with (struct serial_struct) set as follows:
840 	 *      o flags & ASYNC_SPD_MASK == ASYNC_SPD_CUST
841 	 *      o custom_divisor set to baud_base / your_new_baudrate
842 	 * ** Step 3 is done courtesy of code borrowed from serial.c - I should really
843 	 *    spend some time and separate+move this common code to serial.c, it is
844 	 *    replicated in nearly every serial driver you see.
845 	 */
846 
847 	/* 1. Get the baud rate from the tty settings, this observes alt_speed hack */
848 
849 	baud = tty_get_baud_rate(port->tty);
850 	dbg("%s - tty_get_baud_rate reports speed %d", __FUNCTION__, baud);
851 
852 	/* 2. Observe async-compatible custom_divisor hack, update baudrate if needed */
853 
854 	if (baud == 38400 &&
855 	    ((priv->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST) &&
856 	     (priv->custom_divisor)) {
857 		baud = priv->baud_base / priv->custom_divisor;
858 		dbg("%s - custom divisor %d sets baud rate to %d", __FUNCTION__, priv->custom_divisor, baud);
859 	}
860 
861 	/* 3. Convert baudrate to device-specific divisor */
862 
863 	if (!baud) baud = 9600;
864 	switch(priv->chip_type) {
865 	case SIO: /* SIO chip */
866 		switch(baud) {
867 		case 300: div_value = ftdi_sio_b300; break;
868 		case 600: div_value = ftdi_sio_b600; break;
869 		case 1200: div_value = ftdi_sio_b1200; break;
870 		case 2400: div_value = ftdi_sio_b2400; break;
871 		case 4800: div_value = ftdi_sio_b4800; break;
872 		case 9600: div_value = ftdi_sio_b9600; break;
873 		case 19200: div_value = ftdi_sio_b19200; break;
874 		case 38400: div_value = ftdi_sio_b38400; break;
875 		case 57600: div_value = ftdi_sio_b57600;  break;
876 		case 115200: div_value = ftdi_sio_b115200; break;
877 		} /* baud */
878 		if (div_value == 0) {
879 			dbg("%s - Baudrate (%d) requested is not supported", __FUNCTION__,  baud);
880 			div_value = ftdi_sio_b9600;
881 			div_okay = 0;
882 		}
883 		break;
884 	case FT8U232AM: /* 8U232AM chip */
885 		if (baud <= 3000000) {
886 			div_value = ftdi_232am_baud_to_divisor(baud);
887 		} else {
888 	                dbg("%s - Baud rate too high!", __FUNCTION__);
889 			div_value = ftdi_232am_baud_to_divisor(9600);
890 			div_okay = 0;
891 		}
892 		break;
893 	case FT232BM: /* FT232BM chip */
894 	case FT2232C: /* FT2232C chip */
895 	case FT232RL:
896 		if (baud <= 3000000) {
897 			div_value = ftdi_232bm_baud_to_divisor(baud);
898 		} else {
899 	                dbg("%s - Baud rate too high!", __FUNCTION__);
900 			div_value = ftdi_232bm_baud_to_divisor(9600);
901 			div_okay = 0;
902 		}
903 		break;
904 	} /* priv->chip_type */
905 
906 	if (div_okay) {
907 		dbg("%s - Baud rate set to %d (divisor 0x%lX) on chip %s",
908 			__FUNCTION__, baud, (unsigned long)div_value,
909 			ftdi_chip_name[priv->chip_type]);
910 	}
911 
912 	return(div_value);
913 }
914 
915 
916 static int get_serial_info(struct usb_serial_port * port, struct serial_struct __user * retinfo)
917 {
918 	struct ftdi_private *priv = usb_get_serial_port_data(port);
919 	struct serial_struct tmp;
920 
921 	if (!retinfo)
922 		return -EFAULT;
923 	memset(&tmp, 0, sizeof(tmp));
924 	tmp.flags = priv->flags;
925 	tmp.baud_base = priv->baud_base;
926 	tmp.custom_divisor = priv->custom_divisor;
927 	if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
928 		return -EFAULT;
929 	return 0;
930 } /* get_serial_info */
931 
932 
933 static int set_serial_info(struct usb_serial_port * port, struct serial_struct __user * newinfo)
934 { /* set_serial_info */
935 	struct ftdi_private *priv = usb_get_serial_port_data(port);
936 	struct serial_struct new_serial;
937 	struct ftdi_private old_priv;
938 
939 	if (copy_from_user(&new_serial, newinfo, sizeof(new_serial)))
940 		return -EFAULT;
941 	old_priv = * priv;
942 
943 	/* Do error checking and permission checking */
944 
945 	if (!capable(CAP_SYS_ADMIN)) {
946 		if (((new_serial.flags & ~ASYNC_USR_MASK) !=
947 		     (priv->flags & ~ASYNC_USR_MASK)))
948 			return -EPERM;
949 		priv->flags = ((priv->flags & ~ASYNC_USR_MASK) |
950 			       (new_serial.flags & ASYNC_USR_MASK));
951 		priv->custom_divisor = new_serial.custom_divisor;
952 		goto check_and_exit;
953 	}
954 
955 	if ((new_serial.baud_base != priv->baud_base) &&
956 	    (new_serial.baud_base < 9600))
957 		return -EINVAL;
958 
959 	/* Make the changes - these are privileged changes! */
960 
961 	priv->flags = ((priv->flags & ~ASYNC_FLAGS) |
962 	               (new_serial.flags & ASYNC_FLAGS));
963 	priv->custom_divisor = new_serial.custom_divisor;
964 
965 	port->tty->low_latency = (priv->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
966 
967 check_and_exit:
968 	if ((old_priv.flags & ASYNC_SPD_MASK) !=
969 	     (priv->flags & ASYNC_SPD_MASK)) {
970 		if ((priv->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
971 			port->tty->alt_speed = 57600;
972 		else if ((priv->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
973 			port->tty->alt_speed = 115200;
974 		else if ((priv->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI)
975 			port->tty->alt_speed = 230400;
976 		else if ((priv->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP)
977 			port->tty->alt_speed = 460800;
978 		else
979 			port->tty->alt_speed = 0;
980 	}
981 	if (((old_priv.flags & ASYNC_SPD_MASK) !=
982 	     (priv->flags & ASYNC_SPD_MASK)) ||
983 	    (((priv->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST) &&
984 	     (old_priv.custom_divisor != priv->custom_divisor))) {
985 		change_speed(port);
986 	}
987 
988 	return (0);
989 
990 } /* set_serial_info */
991 
992 
993 /* Determine type of FTDI chip based on USB config and descriptor. */
994 static void ftdi_determine_type(struct usb_serial_port *port)
995 {
996 	struct ftdi_private *priv = usb_get_serial_port_data(port);
997 	struct usb_serial *serial = port->serial;
998 	struct usb_device *udev = serial->dev;
999 	unsigned version;
1000 	unsigned interfaces;
1001 
1002 	/* Assume it is not the original SIO device for now. */
1003 	priv->baud_base = 48000000 / 2;
1004 	priv->write_offset = 0;
1005 
1006 	version = le16_to_cpu(udev->descriptor.bcdDevice);
1007 	interfaces = udev->actconfig->desc.bNumInterfaces;
1008 	dbg("%s: bcdDevice = 0x%x, bNumInterfaces = %u", __FUNCTION__,
1009 			version, interfaces);
1010 	if (interfaces > 1) {
1011 		int inter;
1012 
1013 		/* Multiple interfaces.  Assume FT2232C. */
1014 		priv->chip_type = FT2232C;
1015 		/* Determine interface code. */
1016 		inter = serial->interface->altsetting->desc.bInterfaceNumber;
1017 		if (inter == 0) {
1018 			priv->interface = PIT_SIOA;
1019 		} else {
1020 			priv->interface = PIT_SIOB;
1021 		}
1022 		/* BM-type devices have a bug where bcdDevice gets set
1023 		 * to 0x200 when iSerialNumber is 0.  */
1024 		if (version < 0x500) {
1025 			dbg("%s: something fishy - bcdDevice too low for multi-interface device",
1026 					__FUNCTION__);
1027 		}
1028 	} else if (version < 0x200) {
1029 		/* Old device.  Assume its the original SIO. */
1030 		priv->chip_type = SIO;
1031 		priv->baud_base = 12000000 / 16;
1032 		priv->write_offset = 1;
1033 	} else if (version < 0x400) {
1034 		/* Assume its an FT8U232AM (or FT8U245AM) */
1035 		/* (It might be a BM because of the iSerialNumber bug,
1036 		 * but it will still work as an AM device.) */
1037 		priv->chip_type = FT8U232AM;
1038 	} else if (version < 0x600) {
1039 		/* Assume its an FT232BM (or FT245BM) */
1040 		priv->chip_type = FT232BM;
1041 	} else {
1042 		/* Assume its an FT232R  */
1043 		priv->chip_type = FT232RL;
1044 	}
1045 	info("Detected %s", ftdi_chip_name[priv->chip_type]);
1046 }
1047 
1048 
1049 /*
1050  * ***************************************************************************
1051  * Sysfs Attribute
1052  * ***************************************************************************
1053  */
1054 
1055 static ssize_t show_latency_timer(struct device *dev, struct device_attribute *attr, char *buf)
1056 {
1057 	struct usb_serial_port *port = to_usb_serial_port(dev);
1058 	struct ftdi_private *priv = usb_get_serial_port_data(port);
1059 	struct usb_device *udev = port->serial->dev;
1060 	unsigned short latency = 0;
1061 	int rv = 0;
1062 
1063 
1064 	dbg("%s",__FUNCTION__);
1065 
1066 	rv = usb_control_msg(udev,
1067 			     usb_rcvctrlpipe(udev, 0),
1068 			     FTDI_SIO_GET_LATENCY_TIMER_REQUEST,
1069 			     FTDI_SIO_GET_LATENCY_TIMER_REQUEST_TYPE,
1070 			     0, priv->interface,
1071 			     (char*) &latency, 1, WDR_TIMEOUT);
1072 
1073 	if (rv < 0) {
1074 		dev_err(dev, "Unable to read latency timer: %i", rv);
1075 		return -EIO;
1076 	}
1077 	return sprintf(buf, "%i\n", latency);
1078 }
1079 
1080 /* Write a new value of the latency timer, in units of milliseconds. */
1081 static ssize_t store_latency_timer(struct device *dev, struct device_attribute *attr, const char *valbuf,
1082 				   size_t count)
1083 {
1084 	struct usb_serial_port *port = to_usb_serial_port(dev);
1085 	struct ftdi_private *priv = usb_get_serial_port_data(port);
1086 	struct usb_device *udev = port->serial->dev;
1087 	char buf[1];
1088 	int v = simple_strtoul(valbuf, NULL, 10);
1089 	int rv = 0;
1090 
1091 	dbg("%s: setting latency timer = %i", __FUNCTION__, v);
1092 
1093 	rv = usb_control_msg(udev,
1094 			     usb_sndctrlpipe(udev, 0),
1095 			     FTDI_SIO_SET_LATENCY_TIMER_REQUEST,
1096 			     FTDI_SIO_SET_LATENCY_TIMER_REQUEST_TYPE,
1097 			     v, priv->interface,
1098 			     buf, 0, WDR_TIMEOUT);
1099 
1100 	if (rv < 0) {
1101 		dev_err(dev, "Unable to write latency timer: %i", rv);
1102 		return -EIO;
1103 	}
1104 
1105 	return count;
1106 }
1107 
1108 /* Write an event character directly to the FTDI register.  The ASCII
1109    value is in the low 8 bits, with the enable bit in the 9th bit. */
1110 static ssize_t store_event_char(struct device *dev, struct device_attribute *attr, const char *valbuf,
1111 				size_t count)
1112 {
1113 	struct usb_serial_port *port = to_usb_serial_port(dev);
1114 	struct ftdi_private *priv = usb_get_serial_port_data(port);
1115 	struct usb_device *udev = port->serial->dev;
1116 	char buf[1];
1117 	int v = simple_strtoul(valbuf, NULL, 10);
1118 	int rv = 0;
1119 
1120 	dbg("%s: setting event char = %i", __FUNCTION__, v);
1121 
1122 	rv = usb_control_msg(udev,
1123 			     usb_sndctrlpipe(udev, 0),
1124 			     FTDI_SIO_SET_EVENT_CHAR_REQUEST,
1125 			     FTDI_SIO_SET_EVENT_CHAR_REQUEST_TYPE,
1126 			     v, priv->interface,
1127 			     buf, 0, WDR_TIMEOUT);
1128 
1129 	if (rv < 0) {
1130 		dbg("Unable to write event character: %i", rv);
1131 		return -EIO;
1132 	}
1133 
1134 	return count;
1135 }
1136 
1137 static DEVICE_ATTR(latency_timer, S_IWUSR | S_IRUGO, show_latency_timer, store_latency_timer);
1138 static DEVICE_ATTR(event_char, S_IWUSR, NULL, store_event_char);
1139 
1140 static int create_sysfs_attrs(struct usb_serial_port *port)
1141 {
1142 	struct ftdi_private *priv = usb_get_serial_port_data(port);
1143 	int retval = 0;
1144 
1145 	dbg("%s",__FUNCTION__);
1146 
1147 	/* XXX I've no idea if the original SIO supports the event_char
1148 	 * sysfs parameter, so I'm playing it safe.  */
1149 	if (priv->chip_type != SIO) {
1150 		dbg("sysfs attributes for %s", ftdi_chip_name[priv->chip_type]);
1151 		retval = device_create_file(&port->dev, &dev_attr_event_char);
1152 		if ((!retval) &&
1153 		    (priv->chip_type == FT232BM ||
1154 		     priv->chip_type == FT2232C ||
1155 		     priv->chip_type == FT232RL)) {
1156 			retval = device_create_file(&port->dev,
1157 						    &dev_attr_latency_timer);
1158 		}
1159 	}
1160 	return retval;
1161 }
1162 
1163 static void remove_sysfs_attrs(struct usb_serial_port *port)
1164 {
1165 	struct ftdi_private *priv = usb_get_serial_port_data(port);
1166 
1167 	dbg("%s",__FUNCTION__);
1168 
1169 	/* XXX see create_sysfs_attrs */
1170 	if (priv->chip_type != SIO) {
1171 		device_remove_file(&port->dev, &dev_attr_event_char);
1172 		if (priv->chip_type == FT232BM ||
1173 		    priv->chip_type == FT2232C ||
1174 		    priv->chip_type == FT232RL) {
1175 			device_remove_file(&port->dev, &dev_attr_latency_timer);
1176 		}
1177 	}
1178 
1179 }
1180 
1181 /*
1182  * ***************************************************************************
1183  * FTDI driver specific functions
1184  * ***************************************************************************
1185  */
1186 
1187 /* Probe function to check for special devices */
1188 static int ftdi_sio_probe (struct usb_serial *serial, const struct usb_device_id *id)
1189 {
1190 	struct ftdi_sio_quirk *quirk = (struct ftdi_sio_quirk *)id->driver_info;
1191 
1192 	if (quirk && quirk->probe) {
1193 		int ret = quirk->probe(serial);
1194 		if (ret != 0)
1195 			return ret;
1196 	}
1197 
1198 	usb_set_serial_data(serial, (void *)id->driver_info);
1199 
1200 	return 0;
1201 }
1202 
1203 static int ftdi_sio_port_probe(struct usb_serial_port *port)
1204 {
1205 	struct ftdi_private *priv;
1206 	struct ftdi_sio_quirk *quirk = usb_get_serial_data(port->serial);
1207 
1208 
1209 	dbg("%s",__FUNCTION__);
1210 
1211 	priv = kzalloc(sizeof(struct ftdi_private), GFP_KERNEL);
1212 	if (!priv){
1213 		err("%s- kmalloc(%Zd) failed.", __FUNCTION__, sizeof(struct ftdi_private));
1214 		return -ENOMEM;
1215 	}
1216 
1217 	spin_lock_init(&priv->rx_lock);
1218 	spin_lock_init(&priv->tx_lock);
1219         init_waitqueue_head(&priv->delta_msr_wait);
1220 	/* This will push the characters through immediately rather
1221 	   than queue a task to deliver them */
1222 	priv->flags = ASYNC_LOW_LATENCY;
1223 
1224 	if (quirk && quirk->port_probe)
1225 		quirk->port_probe(priv);
1226 
1227 	/* Increase the size of read buffers */
1228 	kfree(port->bulk_in_buffer);
1229 	port->bulk_in_buffer = kmalloc (BUFSZ, GFP_KERNEL);
1230 	if (!port->bulk_in_buffer) {
1231 		kfree (priv);
1232 		return -ENOMEM;
1233 	}
1234 	if (port->read_urb) {
1235 		port->read_urb->transfer_buffer = port->bulk_in_buffer;
1236 		port->read_urb->transfer_buffer_length = BUFSZ;
1237 	}
1238 
1239 	INIT_DELAYED_WORK(&priv->rx_work, ftdi_process_read);
1240 	priv->port = port;
1241 
1242 	/* Free port's existing write urb and transfer buffer. */
1243 	if (port->write_urb) {
1244 		usb_free_urb (port->write_urb);
1245 		port->write_urb = NULL;
1246 	}
1247 	kfree(port->bulk_out_buffer);
1248 	port->bulk_out_buffer = NULL;
1249 
1250 	usb_set_serial_port_data(port, priv);
1251 
1252 	ftdi_determine_type (port);
1253 	create_sysfs_attrs(port);
1254 	return 0;
1255 }
1256 
1257 /* Setup for the USB-UIRT device, which requires hardwired
1258  * baudrate (38400 gets mapped to 312500) */
1259 /* Called from usbserial:serial_probe */
1260 static void ftdi_USB_UIRT_setup (struct ftdi_private *priv)
1261 {
1262 	dbg("%s",__FUNCTION__);
1263 
1264 	priv->flags |= ASYNC_SPD_CUST;
1265 	priv->custom_divisor = 77;
1266 	priv->force_baud = B38400;
1267 } /* ftdi_USB_UIRT_setup */
1268 
1269 /* Setup for the HE-TIRA1 device, which requires hardwired
1270  * baudrate (38400 gets mapped to 100000) and RTS-CTS enabled.  */
1271 static void ftdi_HE_TIRA1_setup (struct ftdi_private *priv)
1272 {
1273 	dbg("%s",__FUNCTION__);
1274 
1275 	priv->flags |= ASYNC_SPD_CUST;
1276 	priv->custom_divisor = 240;
1277 	priv->force_baud = B38400;
1278 	priv->force_rtscts = 1;
1279 } /* ftdi_HE_TIRA1_setup */
1280 
1281 /*
1282  * First port on Olimex arm-usb-ocd is reserved for JTAG interface
1283  * and can be accessed from userspace using openocd.
1284  */
1285 static int ftdi_olimex_probe(struct usb_serial *serial)
1286 {
1287 	struct usb_device *udev = serial->dev;
1288 	struct usb_interface *interface = serial->interface;
1289 
1290 	dbg("%s",__FUNCTION__);
1291 
1292 	if (interface == udev->actconfig->interface[0]) {
1293 		info("Ignoring reserved serial port on Olimex arm-usb-ocd\n");
1294 		return -ENODEV;
1295 	}
1296 
1297 	return 0;
1298 }
1299 
1300 /* ftdi_shutdown is called from usbserial:usb_serial_disconnect
1301  *   it is called when the usb device is disconnected
1302  *
1303  *   usbserial:usb_serial_disconnect
1304  *      calls __serial_close for each open of the port
1305  *      shutdown is called then (ie ftdi_shutdown)
1306  */
1307 static void ftdi_shutdown (struct usb_serial *serial)
1308 {
1309 	dbg("%s", __FUNCTION__);
1310 }
1311 
1312 static int ftdi_sio_port_remove(struct usb_serial_port *port)
1313 {
1314 	struct ftdi_private *priv = usb_get_serial_port_data(port);
1315 
1316 	dbg("%s", __FUNCTION__);
1317 
1318 	remove_sysfs_attrs(port);
1319 
1320 	/* all open ports are closed at this point
1321          *    (by usbserial.c:__serial_close, which calls ftdi_close)
1322 	 */
1323 
1324 	if (priv) {
1325 		usb_set_serial_port_data(port, NULL);
1326 		kfree(priv);
1327 	}
1328 
1329 	return 0;
1330 }
1331 
1332 static int  ftdi_open (struct usb_serial_port *port, struct file *filp)
1333 { /* ftdi_open */
1334 	struct usb_device *dev = port->serial->dev;
1335 	struct ftdi_private *priv = usb_get_serial_port_data(port);
1336 	unsigned long flags;
1337 
1338 	int result = 0;
1339 	char buf[1]; /* Needed for the usb_control_msg I think */
1340 
1341 	dbg("%s", __FUNCTION__);
1342 
1343 	spin_lock_irqsave(&priv->tx_lock, flags);
1344 	priv->tx_bytes = 0;
1345 	spin_unlock_irqrestore(&priv->tx_lock, flags);
1346 	spin_lock_irqsave(&priv->rx_lock, flags);
1347 	priv->rx_bytes = 0;
1348 	spin_unlock_irqrestore(&priv->rx_lock, flags);
1349 
1350 	if (port->tty)
1351 		port->tty->low_latency = (priv->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
1352 
1353 	/* No error checking for this (will get errors later anyway) */
1354 	/* See ftdi_sio.h for description of what is reset */
1355 	usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
1356 			FTDI_SIO_RESET_REQUEST, FTDI_SIO_RESET_REQUEST_TYPE,
1357 			FTDI_SIO_RESET_SIO,
1358 			priv->interface, buf, 0, WDR_TIMEOUT);
1359 
1360 	/* Termios defaults are set by usb_serial_init. We don't change
1361 	   port->tty->termios - this would loose speed settings, etc.
1362 	   This is same behaviour as serial.c/rs_open() - Kuba */
1363 
1364 	/* ftdi_set_termios  will send usb control messages */
1365 	if (port->tty)
1366 		ftdi_set_termios(port, NULL);
1367 
1368 	/* FIXME: Flow control might be enabled, so it should be checked -
1369 	   we have no control of defaults! */
1370 	/* Turn on RTS and DTR since we are not flow controlling by default */
1371 	set_mctrl(port, TIOCM_DTR | TIOCM_RTS);
1372 
1373 	/* Not throttled */
1374 	spin_lock_irqsave(&priv->rx_lock, flags);
1375 	priv->rx_flags &= ~(THROTTLED | ACTUALLY_THROTTLED);
1376 	spin_unlock_irqrestore(&priv->rx_lock, flags);
1377 
1378 	/* Start reading from the device */
1379 	priv->rx_processed = 0;
1380 	usb_fill_bulk_urb(port->read_urb, dev,
1381 		      usb_rcvbulkpipe(dev, port->bulk_in_endpointAddress),
1382 		      port->read_urb->transfer_buffer, port->read_urb->transfer_buffer_length,
1383 		      ftdi_read_bulk_callback, port);
1384 	result = usb_submit_urb(port->read_urb, GFP_KERNEL);
1385 	if (result)
1386 		err("%s - failed submitting read urb, error %d", __FUNCTION__, result);
1387 
1388 
1389 	return result;
1390 } /* ftdi_open */
1391 
1392 
1393 
1394 /*
1395  * usbserial:__serial_close  only calls ftdi_close if the point is open
1396  *
1397  *   This only gets called when it is the last close
1398  *
1399  *
1400  */
1401 
1402 static void ftdi_close (struct usb_serial_port *port, struct file *filp)
1403 { /* ftdi_close */
1404 	unsigned int c_cflag = port->tty->termios->c_cflag;
1405 	struct ftdi_private *priv = usb_get_serial_port_data(port);
1406 	char buf[1];
1407 
1408 	dbg("%s", __FUNCTION__);
1409 
1410 	if (c_cflag & HUPCL){
1411 		/* Disable flow control */
1412 		if (usb_control_msg(port->serial->dev,
1413 				    usb_sndctrlpipe(port->serial->dev, 0),
1414 				    FTDI_SIO_SET_FLOW_CTRL_REQUEST,
1415 				    FTDI_SIO_SET_FLOW_CTRL_REQUEST_TYPE,
1416 				    0, priv->interface, buf, 0,
1417 				    WDR_TIMEOUT) < 0) {
1418 			err("error from flowcontrol urb");
1419 		}
1420 
1421 		/* drop RTS and DTR */
1422 		clear_mctrl(port, TIOCM_DTR | TIOCM_RTS);
1423 	} /* Note change no line if hupcl is off */
1424 
1425 	/* cancel any scheduled reading */
1426 	cancel_delayed_work(&priv->rx_work);
1427 	flush_scheduled_work();
1428 
1429 	/* shutdown our bulk read */
1430 	usb_kill_urb(port->read_urb);
1431 } /* ftdi_close */
1432 
1433 
1434 
1435 /* The SIO requires the first byte to have:
1436  *  B0 1
1437  *  B1 0
1438  *  B2..7 length of message excluding byte 0
1439  *
1440  * The new devices do not require this byte
1441  */
1442 static int ftdi_write (struct usb_serial_port *port,
1443 			   const unsigned char *buf, int count)
1444 { /* ftdi_write */
1445 	struct ftdi_private *priv = usb_get_serial_port_data(port);
1446 	struct urb *urb;
1447 	unsigned char *buffer;
1448 	int data_offset ;       /* will be 1 for the SIO and 0 otherwise */
1449 	int status;
1450 	int transfer_size;
1451 	unsigned long flags;
1452 
1453 	dbg("%s port %d, %d bytes", __FUNCTION__, port->number, count);
1454 
1455 	if (count == 0) {
1456 		dbg("write request of 0 bytes");
1457 		return 0;
1458 	}
1459 	spin_lock_irqsave(&priv->tx_lock, flags);
1460 	if (priv->tx_outstanding_urbs > URB_UPPER_LIMIT) {
1461 		spin_unlock_irqrestore(&priv->tx_lock, flags);
1462 		dbg("%s - write limit hit\n", __FUNCTION__);
1463 		return 0;
1464 	}
1465 	priv->tx_outstanding_urbs++;
1466 	spin_unlock_irqrestore(&priv->tx_lock, flags);
1467 
1468 	data_offset = priv->write_offset;
1469         dbg("data_offset set to %d",data_offset);
1470 
1471 	/* Determine total transfer size */
1472 	transfer_size = count;
1473 	if (data_offset > 0) {
1474 		/* Original sio needs control bytes too... */
1475 		transfer_size += (data_offset *
1476 				((count + (PKTSZ - 1 - data_offset)) /
1477 				 (PKTSZ - data_offset)));
1478 	}
1479 
1480 	buffer = kmalloc (transfer_size, GFP_ATOMIC);
1481 	if (!buffer) {
1482 		err("%s ran out of kernel memory for urb ...", __FUNCTION__);
1483 		count = -ENOMEM;
1484 		goto error_no_buffer;
1485 	}
1486 
1487 	urb = usb_alloc_urb(0, GFP_ATOMIC);
1488 	if (!urb) {
1489 		err("%s - no more free urbs", __FUNCTION__);
1490 		count = -ENOMEM;
1491 		goto error_no_urb;
1492 	}
1493 
1494 	/* Copy data */
1495 	if (data_offset > 0) {
1496 		/* Original sio requires control byte at start of each packet. */
1497 		int user_pktsz = PKTSZ - data_offset;
1498 		int todo = count;
1499 		unsigned char *first_byte = buffer;
1500 		const unsigned char *current_position = buf;
1501 
1502 		while (todo > 0) {
1503 			if (user_pktsz > todo) {
1504 				user_pktsz = todo;
1505 			}
1506 			/* Write the control byte at the front of the packet*/
1507 			*first_byte = 1 | ((user_pktsz) << 2);
1508 			/* Copy data for packet */
1509 			memcpy (first_byte + data_offset,
1510 				current_position, user_pktsz);
1511 			first_byte += user_pktsz + data_offset;
1512 			current_position += user_pktsz;
1513 			todo -= user_pktsz;
1514 		}
1515 	} else {
1516 		/* No control byte required. */
1517 		/* Copy in the data to send */
1518 		memcpy (buffer, buf, count);
1519 	}
1520 
1521 	usb_serial_debug_data(debug, &port->dev, __FUNCTION__, transfer_size, buffer);
1522 
1523 	/* fill the buffer and send it */
1524 	usb_fill_bulk_urb(urb, port->serial->dev,
1525 		      usb_sndbulkpipe(port->serial->dev, port->bulk_out_endpointAddress),
1526 		      buffer, transfer_size,
1527 		      ftdi_write_bulk_callback, port);
1528 
1529 	status = usb_submit_urb(urb, GFP_ATOMIC);
1530 	if (status) {
1531 		err("%s - failed submitting write urb, error %d", __FUNCTION__, status);
1532 		count = status;
1533 		goto error;
1534 	} else {
1535 		spin_lock_irqsave(&priv->tx_lock, flags);
1536 		priv->tx_outstanding_bytes += count;
1537 		priv->tx_bytes += count;
1538 		spin_unlock_irqrestore(&priv->tx_lock, flags);
1539 	}
1540 
1541 	/* we are done with this urb, so let the host driver
1542 	 * really free it when it is finished with it */
1543 	usb_free_urb(urb);
1544 
1545 	dbg("%s write returning: %d", __FUNCTION__, count);
1546 	return count;
1547 error:
1548 	usb_free_urb(urb);
1549 error_no_urb:
1550 	kfree (buffer);
1551 error_no_buffer:
1552 	spin_lock_irqsave(&priv->tx_lock, flags);
1553 	priv->tx_outstanding_urbs--;
1554 	spin_unlock_irqrestore(&priv->tx_lock, flags);
1555 	return count;
1556 } /* ftdi_write */
1557 
1558 
1559 /* This function may get called when the device is closed */
1560 
1561 static void ftdi_write_bulk_callback (struct urb *urb)
1562 {
1563 	unsigned long flags;
1564 	struct usb_serial_port *port = (struct usb_serial_port *)urb->context;
1565 	struct ftdi_private *priv;
1566 	int data_offset;       /* will be 1 for the SIO and 0 otherwise */
1567 	unsigned long countback;
1568 	int status = urb->status;
1569 
1570 	/* free up the transfer buffer, as usb_free_urb() does not do this */
1571 	kfree (urb->transfer_buffer);
1572 
1573 	dbg("%s - port %d", __FUNCTION__, port->number);
1574 
1575 	if (status) {
1576 		dbg("nonzero write bulk status received: %d", status);
1577 		return;
1578 	}
1579 
1580 	priv = usb_get_serial_port_data(port);
1581 	if (!priv) {
1582 		dbg("%s - bad port private data pointer - exiting", __FUNCTION__);
1583 		return;
1584 	}
1585 	/* account for transferred data */
1586 	countback = urb->actual_length;
1587 	data_offset = priv->write_offset;
1588 	if (data_offset > 0) {
1589 		/* Subtract the control bytes */
1590 		countback -= (data_offset * ((countback + (PKTSZ - 1)) / PKTSZ));
1591 	}
1592 	spin_lock_irqsave(&priv->tx_lock, flags);
1593 	--priv->tx_outstanding_urbs;
1594 	priv->tx_outstanding_bytes -= countback;
1595 	spin_unlock_irqrestore(&priv->tx_lock, flags);
1596 
1597 	usb_serial_port_softint(port);
1598 } /* ftdi_write_bulk_callback */
1599 
1600 
1601 static int ftdi_write_room( struct usb_serial_port *port )
1602 {
1603 	struct ftdi_private *priv = usb_get_serial_port_data(port);
1604 	int room;
1605 	unsigned long flags;
1606 
1607 	dbg("%s - port %d", __FUNCTION__, port->number);
1608 
1609 	spin_lock_irqsave(&priv->tx_lock, flags);
1610 	if (priv->tx_outstanding_urbs < URB_UPPER_LIMIT) {
1611 		/*
1612 		 * We really can take anything the user throws at us
1613 		 * but let's pick a nice big number to tell the tty
1614 		 * layer that we have lots of free space
1615 		 */
1616 		room = 2048;
1617 	} else {
1618 		room = 0;
1619 	}
1620 	spin_unlock_irqrestore(&priv->tx_lock, flags);
1621 	return room;
1622 } /* ftdi_write_room */
1623 
1624 
1625 static int ftdi_chars_in_buffer (struct usb_serial_port *port)
1626 { /* ftdi_chars_in_buffer */
1627 	struct ftdi_private *priv = usb_get_serial_port_data(port);
1628 	int buffered;
1629 	unsigned long flags;
1630 
1631 	dbg("%s - port %d", __FUNCTION__, port->number);
1632 
1633 	spin_lock_irqsave(&priv->tx_lock, flags);
1634 	buffered = (int)priv->tx_outstanding_bytes;
1635 	spin_unlock_irqrestore(&priv->tx_lock, flags);
1636 	if (buffered < 0) {
1637 		err("%s outstanding tx bytes is negative!", __FUNCTION__);
1638 		buffered = 0;
1639 	}
1640 	return buffered;
1641 } /* ftdi_chars_in_buffer */
1642 
1643 
1644 
1645 static void ftdi_read_bulk_callback (struct urb *urb)
1646 { /* ftdi_read_bulk_callback */
1647 	struct usb_serial_port *port = (struct usb_serial_port *)urb->context;
1648 	struct tty_struct *tty;
1649 	struct ftdi_private *priv;
1650 	unsigned long countread;
1651 	unsigned long flags;
1652 	int status = urb->status;
1653 
1654 	if (urb->number_of_packets > 0) {
1655 		err("%s transfer_buffer_length %d actual_length %d number of packets %d",__FUNCTION__,
1656 		    urb->transfer_buffer_length, urb->actual_length, urb->number_of_packets );
1657 		err("%s transfer_flags %x ", __FUNCTION__,urb->transfer_flags );
1658 	}
1659 
1660 	dbg("%s - port %d", __FUNCTION__, port->number);
1661 
1662 	if (port->open_count <= 0)
1663 		return;
1664 
1665 	tty = port->tty;
1666 	if (!tty) {
1667 		dbg("%s - bad tty pointer - exiting",__FUNCTION__);
1668 		return;
1669 	}
1670 
1671 	priv = usb_get_serial_port_data(port);
1672 	if (!priv) {
1673 		dbg("%s - bad port private data pointer - exiting", __FUNCTION__);
1674 		return;
1675 	}
1676 
1677 	if (urb != port->read_urb) {
1678 		err("%s - Not my urb!", __FUNCTION__);
1679 	}
1680 
1681 	if (status) {
1682 		/* This will happen at close every time so it is a dbg not an err */
1683 		dbg("(this is ok on close) nonzero read bulk status received: "
1684 		    "%d", status);
1685 		return;
1686 	}
1687 
1688 	/* count data bytes, but not status bytes */
1689 	countread = urb->actual_length;
1690 	countread -= 2 * ((countread + (PKTSZ - 1)) / PKTSZ);
1691 	spin_lock_irqsave(&priv->rx_lock, flags);
1692 	priv->rx_bytes += countread;
1693 	spin_unlock_irqrestore(&priv->rx_lock, flags);
1694 
1695 	ftdi_process_read(&priv->rx_work.work);
1696 
1697 } /* ftdi_read_bulk_callback */
1698 
1699 
1700 static void ftdi_process_read (struct work_struct *work)
1701 { /* ftdi_process_read */
1702 	struct ftdi_private *priv =
1703 		container_of(work, struct ftdi_private, rx_work.work);
1704 	struct usb_serial_port *port = priv->port;
1705 	struct urb *urb;
1706 	struct tty_struct *tty;
1707 	char error_flag;
1708 	unsigned char *data;
1709 
1710 	int i;
1711 	int result;
1712 	int need_flip;
1713 	int packet_offset;
1714 	unsigned long flags;
1715 
1716 	dbg("%s - port %d", __FUNCTION__, port->number);
1717 
1718 	if (port->open_count <= 0)
1719 		return;
1720 
1721 	tty = port->tty;
1722 	if (!tty) {
1723 		dbg("%s - bad tty pointer - exiting",__FUNCTION__);
1724 		return;
1725 	}
1726 
1727 	priv = usb_get_serial_port_data(port);
1728 	if (!priv) {
1729 		dbg("%s - bad port private data pointer - exiting", __FUNCTION__);
1730 		return;
1731 	}
1732 
1733 	urb = port->read_urb;
1734 	if (!urb) {
1735 		dbg("%s - bad read_urb pointer - exiting", __FUNCTION__);
1736 		return;
1737 	}
1738 
1739 	data = urb->transfer_buffer;
1740 
1741 	if (priv->rx_processed) {
1742 		dbg("%s - already processed: %d bytes, %d remain", __FUNCTION__,
1743 				priv->rx_processed,
1744 				urb->actual_length - priv->rx_processed);
1745 	} else {
1746 		/* The first two bytes of every read packet are status */
1747 		if (urb->actual_length > 2) {
1748 			usb_serial_debug_data(debug, &port->dev, __FUNCTION__, urb->actual_length, data);
1749 		} else {
1750 			dbg("Status only: %03oo %03oo",data[0],data[1]);
1751 		}
1752 	}
1753 
1754 
1755 	/* TO DO -- check for hung up line and handle appropriately: */
1756 	/*   send hangup  */
1757 	/* See acm.c - you do a tty_hangup  - eg tty_hangup(tty) */
1758 	/* if CD is dropped and the line is not CLOCAL then we should hangup */
1759 
1760 	need_flip = 0;
1761 	for (packet_offset = priv->rx_processed; packet_offset < urb->actual_length; packet_offset += PKTSZ) {
1762 		int length;
1763 
1764 		/* Compare new line status to the old one, signal if different */
1765 		/* N.B. packet may be processed more than once, but differences
1766 		 * are only processed once.  */
1767 		if (priv != NULL) {
1768 			char new_status = data[packet_offset+0] & FTDI_STATUS_B0_MASK;
1769 			if (new_status != priv->prev_status) {
1770 				priv->diff_status |= new_status ^ priv->prev_status;
1771 				wake_up_interruptible(&priv->delta_msr_wait);
1772 				priv->prev_status = new_status;
1773 			}
1774 		}
1775 
1776 		length = min(PKTSZ, urb->actual_length-packet_offset)-2;
1777 		if (length < 0) {
1778 			err("%s - bad packet length: %d", __FUNCTION__, length+2);
1779 			length = 0;
1780 		}
1781 
1782 		if (priv->rx_flags & THROTTLED) {
1783 			dbg("%s - throttled", __FUNCTION__);
1784 			break;
1785 		}
1786 		if (tty_buffer_request_room(tty, length) < length) {
1787 			/* break out & wait for throttling/unthrottling to happen */
1788 			dbg("%s - receive room low", __FUNCTION__);
1789 			break;
1790 		}
1791 
1792 		/* Handle errors and break */
1793 		error_flag = TTY_NORMAL;
1794 		/* Although the device uses a bitmask and hence can have multiple */
1795 		/* errors on a packet - the order here sets the priority the */
1796 		/* error is returned to the tty layer  */
1797 
1798 		if ( data[packet_offset+1] & FTDI_RS_OE ) {
1799 			error_flag = TTY_OVERRUN;
1800 			dbg("OVERRRUN error");
1801 		}
1802 		if ( data[packet_offset+1] & FTDI_RS_BI ) {
1803 			error_flag = TTY_BREAK;
1804 			dbg("BREAK received");
1805 		}
1806 		if ( data[packet_offset+1] & FTDI_RS_PE ) {
1807 			error_flag = TTY_PARITY;
1808 			dbg("PARITY error");
1809 		}
1810 		if ( data[packet_offset+1] & FTDI_RS_FE ) {
1811 			error_flag = TTY_FRAME;
1812 			dbg("FRAMING error");
1813 		}
1814 		if (length > 0) {
1815 			for (i = 2; i < length+2; i++) {
1816 				/* Note that the error flag is duplicated for
1817 				   every character received since we don't know
1818 				   which character it applied to */
1819 				tty_insert_flip_char(tty, data[packet_offset+i], error_flag);
1820 			}
1821 			need_flip = 1;
1822 		}
1823 
1824 #ifdef NOT_CORRECT_BUT_KEEPING_IT_FOR_NOW
1825 		/* if a parity error is detected you get status packets forever
1826 		   until a character is sent without a parity error.
1827 		   This doesn't work well since the application receives a never
1828 		   ending stream of bad data - even though new data hasn't been sent.
1829 		   Therefore I (bill) have taken this out.
1830 		   However - this might make sense for framing errors and so on
1831 		   so I am leaving the code in for now.
1832 		*/
1833 		else {
1834 			if (error_flag != TTY_NORMAL){
1835 				dbg("error_flag is not normal");
1836 				/* In this case it is just status - if that is an error send a bad character */
1837 				if(tty->flip.count >= TTY_FLIPBUF_SIZE) {
1838 					tty_flip_buffer_push(tty);
1839 				}
1840 				tty_insert_flip_char(tty, 0xff, error_flag);
1841 				need_flip = 1;
1842 			}
1843 		}
1844 #endif
1845 	} /* "for(packet_offset=0..." */
1846 
1847 	/* Low latency */
1848 	if (need_flip) {
1849 		tty_flip_buffer_push(tty);
1850 	}
1851 
1852 	if (packet_offset < urb->actual_length) {
1853 		/* not completely processed - record progress */
1854 		priv->rx_processed = packet_offset;
1855 		dbg("%s - incomplete, %d bytes processed, %d remain",
1856 				__FUNCTION__, packet_offset,
1857 				urb->actual_length - packet_offset);
1858 		/* check if we were throttled while processing */
1859 		spin_lock_irqsave(&priv->rx_lock, flags);
1860 		if (priv->rx_flags & THROTTLED) {
1861 			priv->rx_flags |= ACTUALLY_THROTTLED;
1862 			spin_unlock_irqrestore(&priv->rx_lock, flags);
1863 			dbg("%s - deferring remainder until unthrottled",
1864 					__FUNCTION__);
1865 			return;
1866 		}
1867 		spin_unlock_irqrestore(&priv->rx_lock, flags);
1868 		/* if the port is closed stop trying to read */
1869 		if (port->open_count > 0){
1870 			/* delay processing of remainder */
1871 			schedule_delayed_work(&priv->rx_work, 1);
1872 		} else {
1873 			dbg("%s - port is closed", __FUNCTION__);
1874 		}
1875 		return;
1876 	}
1877 
1878 	/* urb is completely processed */
1879 	priv->rx_processed = 0;
1880 
1881 	/* if the port is closed stop trying to read */
1882 	if (port->open_count > 0){
1883 		/* Continue trying to always read  */
1884 		usb_fill_bulk_urb(port->read_urb, port->serial->dev,
1885 			      usb_rcvbulkpipe(port->serial->dev, port->bulk_in_endpointAddress),
1886 			      port->read_urb->transfer_buffer, port->read_urb->transfer_buffer_length,
1887 			      ftdi_read_bulk_callback, port);
1888 
1889 		result = usb_submit_urb(port->read_urb, GFP_ATOMIC);
1890 		if (result)
1891 			err("%s - failed resubmitting read urb, error %d", __FUNCTION__, result);
1892 	}
1893 
1894 	return;
1895 } /* ftdi_process_read */
1896 
1897 
1898 static void ftdi_break_ctl( struct usb_serial_port *port, int break_state )
1899 {
1900 	struct ftdi_private *priv = usb_get_serial_port_data(port);
1901 	__u16 urb_value = 0;
1902 	char buf[1];
1903 
1904 	/* break_state = -1 to turn on break, and 0 to turn off break */
1905 	/* see drivers/char/tty_io.c to see it used */
1906 	/* last_set_data_urb_value NEVER has the break bit set in it */
1907 
1908 	if (break_state) {
1909 		urb_value = priv->last_set_data_urb_value | FTDI_SIO_SET_BREAK;
1910 	} else {
1911 		urb_value = priv->last_set_data_urb_value;
1912 	}
1913 
1914 
1915 	if (usb_control_msg(port->serial->dev, usb_sndctrlpipe(port->serial->dev, 0),
1916 			    FTDI_SIO_SET_DATA_REQUEST,
1917 			    FTDI_SIO_SET_DATA_REQUEST_TYPE,
1918 			    urb_value , priv->interface,
1919 			    buf, 0, WDR_TIMEOUT) < 0) {
1920 		err("%s FAILED to enable/disable break state (state was %d)", __FUNCTION__,break_state);
1921 	}
1922 
1923 	dbg("%s break state is %d - urb is %d", __FUNCTION__,break_state, urb_value);
1924 
1925 }
1926 
1927 
1928 /* old_termios contains the original termios settings and tty->termios contains
1929  * the new setting to be used
1930  * WARNING: set_termios calls this with old_termios in kernel space
1931  */
1932 
1933 static void ftdi_set_termios (struct usb_serial_port *port, struct ktermios *old_termios)
1934 { /* ftdi_termios */
1935 	struct usb_device *dev = port->serial->dev;
1936 	unsigned int cflag = port->tty->termios->c_cflag;
1937 	struct ftdi_private *priv = usb_get_serial_port_data(port);
1938 	__u16 urb_value; /* will hold the new flags */
1939 	char buf[1]; /* Perhaps I should dynamically alloc this? */
1940 
1941 	// Added for xon/xoff support
1942 	unsigned int iflag = port->tty->termios->c_iflag;
1943 	unsigned char vstop;
1944 	unsigned char vstart;
1945 
1946 	dbg("%s", __FUNCTION__);
1947 
1948 	/* Force baud rate if this device requires it, unless it is set to B0. */
1949 	if (priv->force_baud && ((port->tty->termios->c_cflag & CBAUD) != B0)) {
1950 		dbg("%s: forcing baud rate for this device", __FUNCTION__);
1951 		port->tty->termios->c_cflag &= ~CBAUD;
1952 		port->tty->termios->c_cflag |= priv->force_baud;
1953 	}
1954 
1955 	/* Force RTS-CTS if this device requires it. */
1956 	if (priv->force_rtscts) {
1957 		dbg("%s: forcing rtscts for this device", __FUNCTION__);
1958 		port->tty->termios->c_cflag |= CRTSCTS;
1959 	}
1960 
1961 	cflag = port->tty->termios->c_cflag;
1962 
1963 	/* FIXME -For this cut I don't care if the line is really changing or
1964 	   not  - so just do the change regardless  - should be able to
1965 	   compare old_termios and tty->termios */
1966 	/* NOTE These routines can get interrupted by
1967 	   ftdi_sio_read_bulk_callback  - need to examine what this
1968            means - don't see any problems yet */
1969 
1970 	/* Set number of data bits, parity, stop bits */
1971 
1972 	urb_value = 0;
1973 	urb_value |= (cflag & CSTOPB ? FTDI_SIO_SET_DATA_STOP_BITS_2 :
1974 		      FTDI_SIO_SET_DATA_STOP_BITS_1);
1975 	urb_value |= (cflag & PARENB ?
1976 		      (cflag & PARODD ? FTDI_SIO_SET_DATA_PARITY_ODD :
1977 		       FTDI_SIO_SET_DATA_PARITY_EVEN) :
1978 		      FTDI_SIO_SET_DATA_PARITY_NONE);
1979 	if (cflag & CSIZE) {
1980 		switch (cflag & CSIZE) {
1981 		case CS5: urb_value |= 5; dbg("Setting CS5"); break;
1982 		case CS6: urb_value |= 6; dbg("Setting CS6"); break;
1983 		case CS7: urb_value |= 7; dbg("Setting CS7"); break;
1984 		case CS8: urb_value |= 8; dbg("Setting CS8"); break;
1985 		default:
1986 			err("CSIZE was set but not CS5-CS8");
1987 		}
1988 	}
1989 
1990 	/* This is needed by the break command since it uses the same command - but is
1991 	 *  or'ed with this value  */
1992 	priv->last_set_data_urb_value = urb_value;
1993 
1994 	if (usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
1995 			    FTDI_SIO_SET_DATA_REQUEST,
1996 			    FTDI_SIO_SET_DATA_REQUEST_TYPE,
1997 			    urb_value , priv->interface,
1998 			    buf, 0, WDR_SHORT_TIMEOUT) < 0) {
1999 		err("%s FAILED to set databits/stopbits/parity", __FUNCTION__);
2000 	}
2001 
2002 	/* Now do the baudrate */
2003 	if ((cflag & CBAUD) == B0 ) {
2004 		/* Disable flow control */
2005 		if (usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
2006 				    FTDI_SIO_SET_FLOW_CTRL_REQUEST,
2007 				    FTDI_SIO_SET_FLOW_CTRL_REQUEST_TYPE,
2008 				    0, priv->interface,
2009 				    buf, 0, WDR_TIMEOUT) < 0) {
2010 			err("%s error from disable flowcontrol urb", __FUNCTION__);
2011 		}
2012 		/* Drop RTS and DTR */
2013 		clear_mctrl(port, TIOCM_DTR | TIOCM_RTS);
2014 	} else {
2015 		/* set the baudrate determined before */
2016 		if (change_speed(port)) {
2017 			err("%s urb failed to set baudrate", __FUNCTION__);
2018 		}
2019 		/* Ensure RTS and DTR are raised when baudrate changed from 0 */
2020 		if (!old_termios || (old_termios->c_cflag & CBAUD) == B0) {
2021 			set_mctrl(port, TIOCM_DTR | TIOCM_RTS);
2022 		}
2023 	}
2024 
2025 	/* Set flow control */
2026 	/* Note device also supports DTR/CD (ugh) and Xon/Xoff in hardware */
2027 	if (cflag & CRTSCTS) {
2028 		dbg("%s Setting to CRTSCTS flow control", __FUNCTION__);
2029 		if (usb_control_msg(dev,
2030 				    usb_sndctrlpipe(dev, 0),
2031 				    FTDI_SIO_SET_FLOW_CTRL_REQUEST,
2032 				    FTDI_SIO_SET_FLOW_CTRL_REQUEST_TYPE,
2033 				    0 , (FTDI_SIO_RTS_CTS_HS | priv->interface),
2034 				    buf, 0, WDR_TIMEOUT) < 0) {
2035 			err("urb failed to set to rts/cts flow control");
2036 		}
2037 
2038 	} else {
2039 		/*
2040 		 * Xon/Xoff code
2041 		 *
2042 		 * Check the IXOFF status in the iflag component of the termios structure
2043 		 * if IXOFF is not set, the pre-xon/xoff code is executed.
2044 		*/
2045 		if (iflag & IXOFF) {
2046 			dbg("%s  request to enable xonxoff iflag=%04x",__FUNCTION__,iflag);
2047 			// Try to enable the XON/XOFF on the ftdi_sio
2048 			// Set the vstart and vstop -- could have been done up above where
2049 			// a lot of other dereferencing is done but that would be very
2050 			// inefficient as vstart and vstop are not always needed
2051 			vstart=port->tty->termios->c_cc[VSTART];
2052 			vstop=port->tty->termios->c_cc[VSTOP];
2053 			urb_value=(vstop << 8) | (vstart);
2054 
2055 			if (usb_control_msg(dev,
2056 					    usb_sndctrlpipe(dev, 0),
2057 					    FTDI_SIO_SET_FLOW_CTRL_REQUEST,
2058 					    FTDI_SIO_SET_FLOW_CTRL_REQUEST_TYPE,
2059 					    urb_value , (FTDI_SIO_XON_XOFF_HS
2060 							 | priv->interface),
2061 					    buf, 0, WDR_TIMEOUT) < 0) {
2062 				err("urb failed to set to xon/xoff flow control");
2063 			}
2064 		} else {
2065 			/* else clause to only run if cfag ! CRTSCTS and iflag ! XOFF */
2066 			/* CHECKME Assuming XON/XOFF handled by tty stack - not by device */
2067 			dbg("%s Turning off hardware flow control", __FUNCTION__);
2068 			if (usb_control_msg(dev,
2069 					    usb_sndctrlpipe(dev, 0),
2070 					    FTDI_SIO_SET_FLOW_CTRL_REQUEST,
2071 					    FTDI_SIO_SET_FLOW_CTRL_REQUEST_TYPE,
2072 					    0, priv->interface,
2073 					    buf, 0, WDR_TIMEOUT) < 0) {
2074 				err("urb failed to clear flow control");
2075 			}
2076 		}
2077 
2078 	}
2079 	return;
2080 } /* ftdi_termios */
2081 
2082 
2083 static int ftdi_tiocmget (struct usb_serial_port *port, struct file *file)
2084 {
2085 	struct ftdi_private *priv = usb_get_serial_port_data(port);
2086 	unsigned char buf[2];
2087 	int ret;
2088 
2089 	dbg("%s TIOCMGET", __FUNCTION__);
2090 	switch (priv->chip_type) {
2091 	case SIO:
2092 		/* Request the status from the device */
2093 		if ((ret = usb_control_msg(port->serial->dev,
2094 					   usb_rcvctrlpipe(port->serial->dev, 0),
2095 					   FTDI_SIO_GET_MODEM_STATUS_REQUEST,
2096 					   FTDI_SIO_GET_MODEM_STATUS_REQUEST_TYPE,
2097 					   0, 0,
2098 					   buf, 1, WDR_TIMEOUT)) < 0 ) {
2099 			err("%s Could not get modem status of device - err: %d", __FUNCTION__,
2100 			    ret);
2101 			return(ret);
2102 		}
2103 		break;
2104 	case FT8U232AM:
2105 	case FT232BM:
2106 	case FT2232C:
2107 	case FT232RL:
2108 		/* the 8U232AM returns a two byte value (the sio is a 1 byte value) - in the same
2109 		   format as the data returned from the in point */
2110 		if ((ret = usb_control_msg(port->serial->dev,
2111 					   usb_rcvctrlpipe(port->serial->dev, 0),
2112 					   FTDI_SIO_GET_MODEM_STATUS_REQUEST,
2113 					   FTDI_SIO_GET_MODEM_STATUS_REQUEST_TYPE,
2114 					   0, priv->interface,
2115 					   buf, 2, WDR_TIMEOUT)) < 0 ) {
2116 			err("%s Could not get modem status of device - err: %d", __FUNCTION__,
2117 			    ret);
2118 			return(ret);
2119 		}
2120 		break;
2121 	default:
2122 		return -EFAULT;
2123 		break;
2124 	}
2125 
2126 	return  (buf[0] & FTDI_SIO_DSR_MASK ? TIOCM_DSR : 0) |
2127 		(buf[0] & FTDI_SIO_CTS_MASK ? TIOCM_CTS : 0) |
2128 		(buf[0]  & FTDI_SIO_RI_MASK  ? TIOCM_RI  : 0) |
2129 		(buf[0]  & FTDI_SIO_RLSD_MASK ? TIOCM_CD  : 0) |
2130 		priv->last_dtr_rts;
2131 }
2132 
2133 static int ftdi_tiocmset(struct usb_serial_port *port, struct file * file, unsigned int set, unsigned int clear)
2134 {
2135 	dbg("%s TIOCMSET", __FUNCTION__);
2136 	return update_mctrl(port, set, clear);
2137 }
2138 
2139 
2140 static int ftdi_ioctl (struct usb_serial_port *port, struct file * file, unsigned int cmd, unsigned long arg)
2141 {
2142 	struct ftdi_private *priv = usb_get_serial_port_data(port);
2143 
2144 	dbg("%s cmd 0x%04x", __FUNCTION__, cmd);
2145 
2146 	/* Based on code from acm.c and others */
2147 	switch (cmd) {
2148 
2149 	case TIOCGSERIAL: /* gets serial port data */
2150 		return get_serial_info(port, (struct serial_struct __user *) arg);
2151 
2152 	case TIOCSSERIAL: /* sets serial port data */
2153 		return set_serial_info(port, (struct serial_struct __user *) arg);
2154 
2155 	/*
2156 	 * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change
2157 	 * - mask passed in arg for lines of interest
2158 	 *   (use |'ed TIOCM_RNG/DSR/CD/CTS for masking)
2159 	 * Caller should use TIOCGICOUNT to see which one it was.
2160 	 *
2161 	 * This code is borrowed from linux/drivers/char/serial.c
2162 	 */
2163 	case TIOCMIWAIT:
2164 		while (priv != NULL) {
2165 			interruptible_sleep_on(&priv->delta_msr_wait);
2166 			/* see if a signal did it */
2167 			if (signal_pending(current))
2168 				return -ERESTARTSYS;
2169 			else {
2170 				char diff = priv->diff_status;
2171 
2172 				if (diff == 0) {
2173 					return -EIO; /* no change => error */
2174 				}
2175 
2176 				/* Consume all events */
2177 				priv->diff_status = 0;
2178 
2179 				/* Return 0 if caller wanted to know about these bits */
2180 				if ( ((arg & TIOCM_RNG) && (diff & FTDI_RS0_RI)) ||
2181 				     ((arg & TIOCM_DSR) && (diff & FTDI_RS0_DSR)) ||
2182 				     ((arg & TIOCM_CD)  && (diff & FTDI_RS0_RLSD)) ||
2183 				     ((arg & TIOCM_CTS) && (diff & FTDI_RS0_CTS)) ) {
2184 					return 0;
2185 				}
2186 				/*
2187 				 * Otherwise caller can't care less about what happened,
2188 				 * and so we continue to wait for more events.
2189 				 */
2190 			}
2191 		}
2192 		return(0);
2193 		break;
2194 	default:
2195 		break;
2196 
2197 	}
2198 
2199 
2200 	/* This is not necessarily an error - turns out the higher layers will do
2201 	 *  some ioctls itself (see comment above)
2202 	 */
2203 	dbg("%s arg not supported - it was 0x%04x - check /usr/include/asm/ioctls.h", __FUNCTION__, cmd);
2204 
2205 	return(-ENOIOCTLCMD);
2206 } /* ftdi_ioctl */
2207 
2208 
2209 static void ftdi_throttle (struct usb_serial_port *port)
2210 {
2211 	struct ftdi_private *priv = usb_get_serial_port_data(port);
2212 	unsigned long flags;
2213 
2214 	dbg("%s - port %d", __FUNCTION__, port->number);
2215 
2216 	spin_lock_irqsave(&priv->rx_lock, flags);
2217 	priv->rx_flags |= THROTTLED;
2218 	spin_unlock_irqrestore(&priv->rx_lock, flags);
2219 }
2220 
2221 
2222 static void ftdi_unthrottle (struct usb_serial_port *port)
2223 {
2224 	struct ftdi_private *priv = usb_get_serial_port_data(port);
2225 	int actually_throttled;
2226 	unsigned long flags;
2227 
2228 	dbg("%s - port %d", __FUNCTION__, port->number);
2229 
2230 	spin_lock_irqsave(&priv->rx_lock, flags);
2231 	actually_throttled = priv->rx_flags & ACTUALLY_THROTTLED;
2232 	priv->rx_flags &= ~(THROTTLED | ACTUALLY_THROTTLED);
2233 	spin_unlock_irqrestore(&priv->rx_lock, flags);
2234 
2235 	if (actually_throttled)
2236 		schedule_delayed_work(&priv->rx_work, 0);
2237 }
2238 
2239 static int __init ftdi_init (void)
2240 {
2241 	int retval;
2242 
2243 	dbg("%s", __FUNCTION__);
2244 	if (vendor > 0 && product > 0) {
2245 		/* Add user specified VID/PID to reserved element of table. */
2246 		int i;
2247 		for (i = 0; id_table_combined[i].idVendor; i++)
2248 			;
2249 		id_table_combined[i].match_flags = USB_DEVICE_ID_MATCH_DEVICE;
2250 		id_table_combined[i].idVendor = vendor;
2251 		id_table_combined[i].idProduct = product;
2252 	}
2253 	retval = usb_serial_register(&ftdi_sio_device);
2254 	if (retval)
2255 		goto failed_sio_register;
2256 	retval = usb_register(&ftdi_driver);
2257 	if (retval)
2258 		goto failed_usb_register;
2259 
2260 	info(DRIVER_VERSION ":" DRIVER_DESC);
2261 	return 0;
2262 failed_usb_register:
2263 	usb_serial_deregister(&ftdi_sio_device);
2264 failed_sio_register:
2265 	return retval;
2266 }
2267 
2268 
2269 static void __exit ftdi_exit (void)
2270 {
2271 
2272 	dbg("%s", __FUNCTION__);
2273 
2274 	usb_deregister (&ftdi_driver);
2275 	usb_serial_deregister (&ftdi_sio_device);
2276 
2277 }
2278 
2279 
2280 module_init(ftdi_init);
2281 module_exit(ftdi_exit);
2282 
2283 MODULE_AUTHOR( DRIVER_AUTHOR );
2284 MODULE_DESCRIPTION( DRIVER_DESC );
2285 MODULE_LICENSE("GPL");
2286 
2287 module_param(debug, bool, S_IRUGO | S_IWUSR);
2288 MODULE_PARM_DESC(debug, "Debug enabled or not");
2289 module_param(vendor, ushort, 0);
2290 MODULE_PARM_DESC(vendor, "User specified vendor ID (default="
2291 		__MODULE_STRING(FTDI_VID)")");
2292 module_param(product, ushort, 0);
2293 MODULE_PARM_DESC(vendor, "User specified product ID");
2294 
2295