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USB: ftdi_sio: re-implement read processing
[linux-2.6/mini2440.git] / drivers / usb / serial / ipw.c
blob727d323f092aaa25436109a2382a33a243f1eec8
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 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_buffer_request_room(tty, urb->actual_length);
176 tty_insert_flip_string(tty, data, urb->actual_length);
177 tty_flip_buffer_push(tty);
178 }
179 tty_kref_put(tty);
180
181 /* Continue trying to always read */
182 usb_fill_bulk_urb(port->read_urb, port->serial->dev,
183 usb_rcvbulkpipe(port->serial->dev,
184 port->bulk_in_endpointAddress),
185 port->read_urb->transfer_buffer,
186 port->read_urb->transfer_buffer_length,
187 ipw_read_bulk_callback, port);
188 result = usb_submit_urb(port->read_urb, GFP_ATOMIC);
189 if (result)
190 dev_err(&port->dev,
191 "%s - failed resubmitting read urb, error %d\n",
192 __func__, result);
193 return;
194 }
195
196 static int ipw_open(struct tty_struct *tty, struct usb_serial_port *port)
197 {
198 struct usb_device *dev = port->serial->dev;
199 u8 buf_flow_static[16] = IPW_BYTES_FLOWINIT;
200 u8 *buf_flow_init;
201 int result;
202
203 dbg("%s", __func__);
204
205 buf_flow_init = kmemdup(buf_flow_static, 16, GFP_KERNEL);
206 if (!buf_flow_init)
207 return -ENOMEM;
208
209 /* --1: Tell the modem to initialize (we think) From sniffs this is
210 * always the first thing that gets sent to the modem during
211 * opening of the device */
212 dbg("%s: Sending SIO_INIT (we guess)", __func__);
213 result = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
214 IPW_SIO_INIT,
215 USB_TYPE_VENDOR | USB_RECIP_INTERFACE | USB_DIR_OUT,
216 0,
217 0, /* index */
218 NULL,
219 0,
220 100000);
221 if (result < 0)
222 dev_err(&port->dev,
223 "Init of modem failed (error = %d)\n", result);
224
225 /* reset the bulk pipes */
226 usb_clear_halt(dev,
227 usb_rcvbulkpipe(dev, port->bulk_in_endpointAddress));
228 usb_clear_halt(dev,
229 usb_sndbulkpipe(dev, port->bulk_out_endpointAddress));
230
231 /*--2: Start reading from the device */
232 dbg("%s: setting up bulk read callback", __func__);
233 usb_fill_bulk_urb(port->read_urb, dev,
234 usb_rcvbulkpipe(dev, port->bulk_in_endpointAddress),
235 port->bulk_in_buffer,
236 port->bulk_in_size,
237 ipw_read_bulk_callback, port);
238 result = usb_submit_urb(port->read_urb, GFP_KERNEL);
239 if (result < 0)
240 dbg("%s - usb_submit_urb(read bulk) failed with status %d",
241 __func__, result);
242
243 /*--3: Tell the modem to open the floodgates on the rx bulk channel */
244 dbg("%s:asking modem for RxRead (RXBULK_ON)", __func__);
245 result = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
246 IPW_SIO_RXCTL,
247 USB_TYPE_VENDOR | USB_RECIP_INTERFACE | USB_DIR_OUT,
248 IPW_RXBULK_ON,
249 0, /* index */
250 NULL,
251 0,
252 100000);
253 if (result < 0)
254 dev_err(&port->dev,
255 "Enabling bulk RxRead failed (error = %d)\n", result);
256
257 /*--4: setup the initial flowcontrol */
258 dbg("%s:setting init flowcontrol (%s)", __func__, buf_flow_init);
259 result = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
260 IPW_SIO_HANDFLOW,
261 USB_TYPE_VENDOR | USB_RECIP_INTERFACE | USB_DIR_OUT,
262 0,
263 0,
264 buf_flow_init,
265 0x10,
266 200000);
267 if (result < 0)
268 dev_err(&port->dev,
269 "initial flowcontrol failed (error = %d)\n", result);
270
271
272 /*--5: raise the dtr */
273 dbg("%s:raising dtr", __func__);
274 result = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
275 IPW_SIO_SET_PIN,
276 USB_TYPE_VENDOR | USB_RECIP_INTERFACE | USB_DIR_OUT,
277 IPW_PIN_SETDTR,
278 0,
279 NULL,
280 0,
281 200000);
282 if (result < 0)
283 dev_err(&port->dev,
284 "setting dtr failed (error = %d)\n", result);
285
286 /*--6: raise the rts */
287 dbg("%s:raising rts", __func__);
288 result = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
289 IPW_SIO_SET_PIN,
290 USB_TYPE_VENDOR | USB_RECIP_INTERFACE | USB_DIR_OUT,
291 IPW_PIN_SETRTS,
292 0,
293 NULL,
294 0,
295 200000);
296 if (result < 0)
297 dev_err(&port->dev,
298 "setting dtr failed (error = %d)\n", result);
299
300 kfree(buf_flow_init);
301 return 0;
302 }
303
304 static void ipw_dtr_rts(struct usb_serial_port *port, int on)
305 {
306 struct usb_device *dev = port->serial->dev;
307 int result;
308
309 /*--1: drop the dtr */
310 dbg("%s:dropping dtr", __func__);
311 result = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
312 IPW_SIO_SET_PIN,
313 USB_TYPE_VENDOR | USB_RECIP_INTERFACE | USB_DIR_OUT,
314 on ? IPW_PIN_SETDTR : IPW_PIN_CLRDTR,
315 0,
316 NULL,
317 0,
318 200000);
319 if (result < 0)
320 dev_err(&port->dev, "dropping dtr failed (error = %d)\n",
321 result);
322
323 /*--2: drop the rts */
324 dbg("%s:dropping rts", __func__);
325 result = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
326 IPW_SIO_SET_PIN, USB_TYPE_VENDOR |
327 USB_RECIP_INTERFACE | USB_DIR_OUT,
328 on ? IPW_PIN_SETRTS : IPW_PIN_CLRRTS,
329 0,
330 NULL,
331 0,
332 200000);
333 if (result < 0)
334 dev_err(&port->dev,
335 "dropping rts failed (error = %d)\n", result);
336 }
337
338 static void ipw_close(struct usb_serial_port *port)
339 {
340 struct usb_device *dev = port->serial->dev;
341 int result;
342
343 /*--3: purge */
344 dbg("%s:sending purge", __func__);
345 result = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
346 IPW_SIO_PURGE, USB_TYPE_VENDOR |
347 USB_RECIP_INTERFACE | USB_DIR_OUT,
348 0x03,
349 0,
350 NULL,
351 0,
352 200000);
353 if (result < 0)
354 dev_err(&port->dev, "purge failed (error = %d)\n", result);
355
356
357 /* send RXBULK_off (tell modem to stop transmitting bulk data on
358 rx chan) */
359 result = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
360 IPW_SIO_RXCTL,
361 USB_TYPE_VENDOR | USB_RECIP_INTERFACE | USB_DIR_OUT,
362 IPW_RXBULK_OFF,
363 0, /* index */
364 NULL,
365 0,
366 100000);
367
368 if (result < 0)
369 dev_err(&port->dev,
370 "Disabling bulk RxRead failed (error = %d)\n", result);
371
372 /* shutdown any in-flight urbs that we know about */
373 usb_kill_urb(port->read_urb);
374 usb_kill_urb(port->write_urb);
375 }
376
377 static void ipw_write_bulk_callback(struct urb *urb)
378 {
379 struct usb_serial_port *port = urb->context;
380 int status = urb->status;
381
382 dbg("%s", __func__);
383
384 port->write_urb_busy = 0;
385
386 if (status)
387 dbg("%s - nonzero write bulk status received: %d",
388 __func__, status);
389
390 usb_serial_port_softint(port);
391 }
392
393 static int ipw_write(struct tty_struct *tty, struct usb_serial_port *port,
394 const unsigned char *buf, int count)
395 {
396 struct usb_device *dev = port->serial->dev;
397 int ret;
398
399 dbg("%s: TOP: count=%d, in_interrupt=%ld", __func__,
400 count, in_interrupt());
401
402 if (count == 0) {
403 dbg("%s - write request of 0 bytes", __func__);
404 return 0;
405 }
406
407 spin_lock_bh(&port->lock);
408 if (port->write_urb_busy) {
409 spin_unlock_bh(&port->lock);
410 dbg("%s - already writing", __func__);
411 return 0;
412 }
413 port->write_urb_busy = 1;
414 spin_unlock_bh(&port->lock);
415
416 count = min(count, port->bulk_out_size);
417 memcpy(port->bulk_out_buffer, buf, count);
418
419 dbg("%s count now:%d", __func__, count);
420
421 usb_fill_bulk_urb(port->write_urb, dev,
422 usb_sndbulkpipe(dev, port->bulk_out_endpointAddress),
423 port->write_urb->transfer_buffer,
424 count,
425 ipw_write_bulk_callback,
426 port);
427
428 ret = usb_submit_urb(port->write_urb, GFP_ATOMIC);
429 if (ret != 0) {
430 port->write_urb_busy = 0;
431 dbg("%s - usb_submit_urb(write bulk) failed with error = %d",
432 __func__, ret);
433 return ret;
434 }
435
436 dbg("%s returning %d", __func__, count);
437 return count;
438 }
439
440 static int ipw_probe(struct usb_serial_port *port)
441 {
442 return 0;
443 }
444
445 static int ipw_disconnect(struct usb_serial_port *port)
446 {
447 usb_set_serial_port_data(port, NULL);
448 return 0;
449 }
450
451 static struct usb_serial_driver ipw_device = {
452 .driver = {
453 .owner = THIS_MODULE,
454 .name = "ipw",
455 },
456 .description = "IPWireless converter",
457 .usb_driver = &usb_ipw_driver,
458 .id_table = usb_ipw_ids,
459 .num_ports = 1,
460 .open = ipw_open,
461 .close = ipw_close,
462 .dtr_rts = ipw_dtr_rts,
463 .port_probe = ipw_probe,
464 .port_remove = ipw_disconnect,
465 .write = ipw_write,
466 .write_bulk_callback = ipw_write_bulk_callback,
467 .read_bulk_callback = ipw_read_bulk_callback,
468 };
469
470
471
472 static int __init usb_ipw_init(void)
473 {
474 int retval;
475
476 retval = usb_serial_register(&ipw_device);
477 if (retval)
478 return retval;
479 retval = usb_register(&usb_ipw_driver);
480 if (retval) {
481 usb_serial_deregister(&ipw_device);
482 return retval;
483 }
484 printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":"
485 DRIVER_DESC "\n");
486 return 0;
487 }
488
489 static void __exit usb_ipw_exit(void)
490 {
491 usb_deregister(&usb_ipw_driver);
492 usb_serial_deregister(&ipw_device);
493 }
494
495 module_init(usb_ipw_init);
496 module_exit(usb_ipw_exit);
497
498 /* Module information */
499 MODULE_AUTHOR(DRIVER_AUTHOR);
500 MODULE_DESCRIPTION(DRIVER_DESC);
501 MODULE_LICENSE("GPL");
502
503 module_param(debug, bool, S_IRUGO | S_IWUSR);
504 MODULE_PARM_DESC(debug, "Debug enabled or not");
Support for the Chinese Samsung S3C2440 based development boards