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USB: tty: Prune uses of tty_request_room in the USB layer
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / usb / serial / ipw.c
blobe1d07840cee66c65c2cb62feb5497bf27491cf82
1 /*
2 * IPWireless 3G UMTS TDD Modem driver (USB connected)
3 *
4 * Copyright (C) 2004 Roelf Diedericks <roelfd@inet.co.za>
5 * Copyright (C) 2004 Greg Kroah-Hartman <greg@kroah.com>
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 * All information about the device was acquired using SnoopyPro
13 * on MSFT's O/S, and examing the MSFT drivers' debug output
14 * (insanely left _on_ in the enduser version)
15 *
16 * It was written out of frustration with the IPWireless USB modem
17 * supplied by Axity3G/Sentech South Africa not supporting
18 * Linux whatsoever.
19 *
20 * Nobody provided any proprietary information that was not already
21 * available for this device.
22 *
23 * The modem adheres to the "3GPP TS 27.007 AT command set for 3G
24 * User Equipment (UE)" standard, available from
25 * http://www.3gpp.org/ftp/Specs/html-info/27007.htm
26 *
27 * The code was only tested the IPWireless handheld modem distributed
28 * in South Africa by Sentech.
29 *
30 * It may work for Woosh Inc in .nz too, as it appears they use the
31 * same kit.
32 *
33 * There is still some work to be done in terms of handling
34 * DCD, DTR, RTS, CTS which are currently faked.
35 * It's good enough for PPP at this point. It's based off all kinds of
36 * code found in usb/serial and usb/class
37 *
38 */
39
40 #include <linux/kernel.h>
41 #include <linux/errno.h>
42 #include <linux/init.h>
43 #include <linux/slab.h>
44 #include <linux/tty.h>
45 #include <linux/tty_flip.h>
46 #include <linux/module.h>
47 #include <linux/spinlock.h>
48 #include <linux/usb.h>
49 #include <linux/usb/serial.h>
50 #include <linux/uaccess.h>
51
52 /*
53 * Version Information
54 */
55 #define DRIVER_VERSION "v0.3"
56 #define DRIVER_AUTHOR "Roelf Diedericks"
57 #define DRIVER_DESC "IPWireless tty driver"
58
59 #define IPW_TTY_MAJOR 240 /* real device node major id, experimental range */
60 #define IPW_TTY_MINORS 256 /* we support 256 devices, dunno why, it'd be insane :) */
61
62 #define USB_IPW_MAGIC 0x6d02 /* magic number for ipw struct */
63
64
65 /* Message sizes */
66 #define EVENT_BUFFER_SIZE 0xFF
67 #define CHAR2INT16(c1, c0) (((u32)((c1) & 0xff) << 8) + (u32)((c0) & 0xff))
68 #define NUM_BULK_URBS 24
69 #define NUM_CONTROL_URBS 16
70
71 /* vendor/product pairs that are known work with this driver*/
72 #define IPW_VID 0x0bc3
73 #define IPW_PID 0x0001
74
75
76 /* Vendor commands: */
77
78 /* baud rates */
79 enum {
80 ipw_sio_b256000 = 0x000e,
81 ipw_sio_b128000 = 0x001d,
82 ipw_sio_b115200 = 0x0020,
83 ipw_sio_b57600 = 0x0040,
84 ipw_sio_b56000 = 0x0042,
85 ipw_sio_b38400 = 0x0060,
86 ipw_sio_b19200 = 0x00c0,
87 ipw_sio_b14400 = 0x0100,
88 ipw_sio_b9600 = 0x0180,
89 ipw_sio_b4800 = 0x0300,
90 ipw_sio_b2400 = 0x0600,
91 ipw_sio_b1200 = 0x0c00,
92 ipw_sio_b600 = 0x1800
93 };
94
95 /* data bits */
96 #define ipw_dtb_7 0x700
97 #define ipw_dtb_8 0x810 /* ok so the define is misleading, I know, but forces 8,n,1 */
98 /* I mean, is there a point to any other setting these days? :) */
99
100 /* usb control request types : */
101 #define IPW_SIO_RXCTL 0x00 /* control bulk rx channel transmissions, value=1/0 (on/off) */
102 #define IPW_SIO_SET_BAUD 0x01 /* set baud, value=requested ipw_sio_bxxxx */
103 #define IPW_SIO_SET_LINE 0x03 /* set databits, parity. value=ipw_dtb_x */
104 #define IPW_SIO_SET_PIN 0x03 /* set/clear dtr/rts value=ipw_pin_xxx */
105 #define IPW_SIO_POLL 0x08 /* get serial port status byte, call with value=0 */
106 #define IPW_SIO_INIT 0x11 /* initializes ? value=0 (appears as first thing todo on open) */
107 #define IPW_SIO_PURGE 0x12 /* purge all transmissions?, call with value=numchar_to_purge */
108 #define IPW_SIO_HANDFLOW 0x13 /* set xon/xoff limits value=0, and a buffer of 0x10 bytes */
109 #define IPW_SIO_SETCHARS 0x13 /* set the flowcontrol special chars, value=0, buf=6 bytes, */
110 /* last 2 bytes contain flowcontrol chars e.g. 00 00 00 00 11 13 */
111
112 /* values used for request IPW_SIO_SET_PIN */
113 #define IPW_PIN_SETDTR 0x101
114 #define IPW_PIN_SETRTS 0x202
115 #define IPW_PIN_CLRDTR 0x100
116 #define IPW_PIN_CLRRTS 0x200 /* unconfirmed */
117
118 /* values used for request IPW_SIO_RXCTL */
119 #define IPW_RXBULK_ON 1
120 #define IPW_RXBULK_OFF 0
121
122 /* various 16 byte hardcoded transferbuffers used by flow control */
123 #define IPW_BYTES_FLOWINIT { 0x01, 0, 0, 0, 0x40, 0, 0, 0, \
124 0, 0, 0, 0, 0, 0, 0, 0 }
125
126 /* Interpretation of modem status lines */
127 /* These need sorting out by individually connecting pins and checking
128 * results. FIXME!
129 * When data is being sent we see 0x30 in the lower byte; this must
130 * contain DSR and CTS ...
131 */
132 #define IPW_DSR ((1<<4) | (1<<5))
133 #define IPW_CTS ((1<<5) | (1<<4))
134
135 #define IPW_WANTS_TO_SEND 0x30
136
137 static const struct usb_device_id usb_ipw_ids[] = {
138 { USB_DEVICE(IPW_VID, IPW_PID) },
139 { },
140 };
141
142 MODULE_DEVICE_TABLE(usb, usb_ipw_ids);
143
144 static struct usb_driver usb_ipw_driver = {
145 .name = "ipwtty",
146 .probe = usb_serial_probe,
147 .disconnect = usb_serial_disconnect,
148 .id_table = usb_ipw_ids,
149 .no_dynamic_id = 1,
150 };
151
152 static int debug;
153
154 static void ipw_read_bulk_callback(struct urb *urb)
155 {
156 struct usb_serial_port *port = urb->context;
157 unsigned char *data = urb->transfer_buffer;
158 struct tty_struct *tty;
159 int result;
160 int status = urb->status;
161
162 dbg("%s - port %d", __func__, port->number);
163
164 if (status) {
165 dbg("%s - nonzero read bulk status received: %d",
166 __func__, status);
167 return;
168 }
169
170 usb_serial_debug_data(debug, &port->dev, __func__,
171 urb->actual_length, data);
172
173 tty = tty_port_tty_get(&port->port);
174 if (tty && urb->actual_length) {
175 tty_insert_flip_string(tty, data, urb->actual_length);
176 tty_flip_buffer_push(tty);
177 }
178 tty_kref_put(tty);
179
180 /* Continue trying to always read */
181 usb_fill_bulk_urb(port->read_urb, port->serial->dev,
182 usb_rcvbulkpipe(port->serial->dev,
183 port->bulk_in_endpointAddress),
184 port->read_urb->transfer_buffer,
185 port->read_urb->transfer_buffer_length,
186 ipw_read_bulk_callback, port);
187 result = usb_submit_urb(port->read_urb, GFP_ATOMIC);
188 if (result)
189 dev_err(&port->dev,
190 "%s - failed resubmitting read urb, error %d\n",
191 __func__, result);
192 return;
193 }
194
195 static int ipw_open(struct tty_struct *tty, struct usb_serial_port *port)
196 {
197 struct usb_device *dev = port->serial->dev;
198 u8 buf_flow_static[16] = IPW_BYTES_FLOWINIT;
199 u8 *buf_flow_init;
200 int result;
201
202 dbg("%s", __func__);
203
204 buf_flow_init = kmemdup(buf_flow_static, 16, GFP_KERNEL);
205 if (!buf_flow_init)
206 return -ENOMEM;
207
208 /* --1: Tell the modem to initialize (we think) From sniffs this is
209 * always the first thing that gets sent to the modem during
210 * opening of the device */
211 dbg("%s: Sending SIO_INIT (we guess)", __func__);
212 result = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
213 IPW_SIO_INIT,
214 USB_TYPE_VENDOR | USB_RECIP_INTERFACE | USB_DIR_OUT,
215 0,
216 0, /* index */
217 NULL,
218 0,
219 100000);
220 if (result < 0)
221 dev_err(&port->dev,
222 "Init of modem failed (error = %d)\n", result);
223
224 /* reset the bulk pipes */
225 usb_clear_halt(dev,
226 usb_rcvbulkpipe(dev, port->bulk_in_endpointAddress));
227 usb_clear_halt(dev,
228 usb_sndbulkpipe(dev, port->bulk_out_endpointAddress));
229
230 /*--2: Start reading from the device */
231 dbg("%s: setting up bulk read callback", __func__);
232 usb_fill_bulk_urb(port->read_urb, dev,
233 usb_rcvbulkpipe(dev, port->bulk_in_endpointAddress),
234 port->bulk_in_buffer,
235 port->bulk_in_size,
236 ipw_read_bulk_callback, port);
237 result = usb_submit_urb(port->read_urb, GFP_KERNEL);
238 if (result < 0)
239 dbg("%s - usb_submit_urb(read bulk) failed with status %d",
240 __func__, result);
241
242 /*--3: Tell the modem to open the floodgates on the rx bulk channel */
243 dbg("%s:asking modem for RxRead (RXBULK_ON)", __func__);
244 result = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
245 IPW_SIO_RXCTL,
246 USB_TYPE_VENDOR | USB_RECIP_INTERFACE | USB_DIR_OUT,
247 IPW_RXBULK_ON,
248 0, /* index */
249 NULL,
250 0,
251 100000);
252 if (result < 0)
253 dev_err(&port->dev,
254 "Enabling bulk RxRead failed (error = %d)\n", result);
255
256 /*--4: setup the initial flowcontrol */
257 dbg("%s:setting init flowcontrol (%s)", __func__, buf_flow_init);
258 result = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
259 IPW_SIO_HANDFLOW,
260 USB_TYPE_VENDOR | USB_RECIP_INTERFACE | USB_DIR_OUT,
261 0,
262 0,
263 buf_flow_init,
264 0x10,
265 200000);
266 if (result < 0)
267 dev_err(&port->dev,
268 "initial flowcontrol failed (error = %d)\n", result);
269
270
271 /*--5: raise the dtr */
272 dbg("%s:raising dtr", __func__);
273 result = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
274 IPW_SIO_SET_PIN,
275 USB_TYPE_VENDOR | USB_RECIP_INTERFACE | USB_DIR_OUT,
276 IPW_PIN_SETDTR,
277 0,
278 NULL,
279 0,
280 200000);
281 if (result < 0)
282 dev_err(&port->dev,
283 "setting dtr failed (error = %d)\n", result);
284
285 /*--6: raise the rts */
286 dbg("%s:raising rts", __func__);
287 result = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
288 IPW_SIO_SET_PIN,
289 USB_TYPE_VENDOR | USB_RECIP_INTERFACE | USB_DIR_OUT,
290 IPW_PIN_SETRTS,
291 0,
292 NULL,
293 0,
294 200000);
295 if (result < 0)
296 dev_err(&port->dev,
297 "setting dtr failed (error = %d)\n", result);
298
299 kfree(buf_flow_init);
300 return 0;
301 }
302
303 static void ipw_dtr_rts(struct usb_serial_port *port, int on)
304 {
305 struct usb_device *dev = port->serial->dev;
306 int result;
307
308 /*--1: drop the dtr */
309 dbg("%s:dropping dtr", __func__);
310 result = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
311 IPW_SIO_SET_PIN,
312 USB_TYPE_VENDOR | USB_RECIP_INTERFACE | USB_DIR_OUT,
313 on ? IPW_PIN_SETDTR : IPW_PIN_CLRDTR,
314 0,
315 NULL,
316 0,
317 200000);
318 if (result < 0)
319 dev_err(&port->dev, "dropping dtr failed (error = %d)\n",
320 result);
321
322 /*--2: drop the rts */
323 dbg("%s:dropping rts", __func__);
324 result = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
325 IPW_SIO_SET_PIN, USB_TYPE_VENDOR |
326 USB_RECIP_INTERFACE | USB_DIR_OUT,
327 on ? IPW_PIN_SETRTS : IPW_PIN_CLRRTS,
328 0,
329 NULL,
330 0,
331 200000);
332 if (result < 0)
333 dev_err(&port->dev,
334 "dropping rts failed (error = %d)\n", result);
335 }
336
337 static void ipw_close(struct usb_serial_port *port)
338 {
339 struct usb_device *dev = port->serial->dev;
340 int result;
341
342 /*--3: purge */
343 dbg("%s:sending purge", __func__);
344 result = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
345 IPW_SIO_PURGE, USB_TYPE_VENDOR |
346 USB_RECIP_INTERFACE | USB_DIR_OUT,
347 0x03,
348 0,
349 NULL,
350 0,
351 200000);
352 if (result < 0)
353 dev_err(&port->dev, "purge failed (error = %d)\n", result);
354
355
356 /* send RXBULK_off (tell modem to stop transmitting bulk data on
357 rx chan) */
358 result = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
359 IPW_SIO_RXCTL,
360 USB_TYPE_VENDOR | USB_RECIP_INTERFACE | USB_DIR_OUT,
361 IPW_RXBULK_OFF,
362 0, /* index */
363 NULL,
364 0,
365 100000);
366
367 if (result < 0)
368 dev_err(&port->dev,
369 "Disabling bulk RxRead failed (error = %d)\n", result);
370
371 /* shutdown any in-flight urbs that we know about */
372 usb_kill_urb(port->read_urb);
373 usb_kill_urb(port->write_urb);
374 }
375
376 static void ipw_write_bulk_callback(struct urb *urb)
377 {
378 struct usb_serial_port *port = urb->context;
379 int status = urb->status;
380
381 dbg("%s", __func__);
382
383 port->write_urb_busy = 0;
384
385 if (status)
386 dbg("%s - nonzero write bulk status received: %d",
387 __func__, status);
388
389 usb_serial_port_softint(port);
390 }
391
392 static int ipw_write(struct tty_struct *tty, struct usb_serial_port *port,
393 const unsigned char *buf, int count)
394 {
395 struct usb_device *dev = port->serial->dev;
396 int ret;
397
398 dbg("%s: TOP: count=%d, in_interrupt=%ld", __func__,
399 count, in_interrupt());
400
401 if (count == 0) {
402 dbg("%s - write request of 0 bytes", __func__);
403 return 0;
404 }
405
406 spin_lock_bh(&port->lock);
407 if (port->write_urb_busy) {
408 spin_unlock_bh(&port->lock);
409 dbg("%s - already writing", __func__);
410 return 0;
411 }
412 port->write_urb_busy = 1;
413 spin_unlock_bh(&port->lock);
414
415 count = min(count, port->bulk_out_size);
416 memcpy(port->bulk_out_buffer, buf, count);
417
418 dbg("%s count now:%d", __func__, count);
419
420 usb_fill_bulk_urb(port->write_urb, dev,
421 usb_sndbulkpipe(dev, port->bulk_out_endpointAddress),
422 port->write_urb->transfer_buffer,
423 count,
424 ipw_write_bulk_callback,
425 port);
426
427 ret = usb_submit_urb(port->write_urb, GFP_ATOMIC);
428 if (ret != 0) {
429 port->write_urb_busy = 0;
430 dbg("%s - usb_submit_urb(write bulk) failed with error = %d",
431 __func__, ret);
432 return ret;
433 }
434
435 dbg("%s returning %d", __func__, count);
436 return count;
437 }
438
439 static int ipw_probe(struct usb_serial_port *port)
440 {
441 return 0;
442 }
443
444 static int ipw_disconnect(struct usb_serial_port *port)
445 {
446 usb_set_serial_port_data(port, NULL);
447 return 0;
448 }
449
450 static struct usb_serial_driver ipw_device = {
451 .driver = {
452 .owner = THIS_MODULE,
453 .name = "ipw",
454 },
455 .description = "IPWireless converter",
456 .usb_driver = &usb_ipw_driver,
457 .id_table = usb_ipw_ids,
458 .num_ports = 1,
459 .open = ipw_open,
460 .close = ipw_close,
461 .dtr_rts = ipw_dtr_rts,
462 .port_probe = ipw_probe,
463 .port_remove = ipw_disconnect,
464 .write = ipw_write,
465 .write_bulk_callback = ipw_write_bulk_callback,
466 .read_bulk_callback = ipw_read_bulk_callback,
467 };
468
469
470
471 static int __init usb_ipw_init(void)
472 {
473 int retval;
474
475 retval = usb_serial_register(&ipw_device);
476 if (retval)
477 return retval;
478 retval = usb_register(&usb_ipw_driver);
479 if (retval) {
480 usb_serial_deregister(&ipw_device);
481 return retval;
482 }
483 printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":"
484 DRIVER_DESC "\n");
485 return 0;
486 }
487
488 static void __exit usb_ipw_exit(void)
489 {
490 usb_deregister(&usb_ipw_driver);
491 usb_serial_deregister(&ipw_device);
492 }
493
494 module_init(usb_ipw_init);
495 module_exit(usb_ipw_exit);
496
497 /* Module information */
498 MODULE_AUTHOR(DRIVER_AUTHOR);
499 MODULE_DESCRIPTION(DRIVER_DESC);
500 MODULE_LICENSE("GPL");
501
502 module_param(debug, bool, S_IRUGO | S_IWUSR);
503 MODULE_PARM_DESC(debug, "Debug enabled or not");
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