FRV: Provide dma_map_page() for NOMMU and fix comments
[linux-2.6] / drivers / usb / serial / ipw.c
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,
197                         struct usb_serial_port *port, struct file *filp)
198 {
199         struct usb_device *dev = port->serial->dev;
200         u8 buf_flow_static[16] = IPW_BYTES_FLOWINIT;
201         u8 *buf_flow_init;
202         int result;
203
204         dbg("%s", __func__);
205
206         buf_flow_init = kmemdup(buf_flow_static, 16, GFP_KERNEL);
207         if (!buf_flow_init)
208                 return -ENOMEM;
209
210         if (tty)
211                 tty->low_latency = 1;
212
213         /* --1: Tell the modem to initialize (we think) From sniffs this is
214          *      always the first thing that gets sent to the modem during
215          *      opening of the device */
216         dbg("%s: Sending SIO_INIT (we guess)", __func__);
217         result = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
218                          IPW_SIO_INIT,
219                          USB_TYPE_VENDOR | USB_RECIP_INTERFACE | USB_DIR_OUT,
220                          0,
221                          0, /* index */
222                          NULL,
223                          0,
224                          100000);
225         if (result < 0)
226                 dev_err(&port->dev,
227                         "Init of modem failed (error = %d)\n", result);
228
229         /* reset the bulk pipes */
230         usb_clear_halt(dev,
231                         usb_rcvbulkpipe(dev, port->bulk_in_endpointAddress));
232         usb_clear_halt(dev,
233                         usb_sndbulkpipe(dev, port->bulk_out_endpointAddress));
234
235         /*--2: Start reading from the device */
236         dbg("%s: setting up bulk read callback", __func__);
237         usb_fill_bulk_urb(port->read_urb, dev,
238                           usb_rcvbulkpipe(dev, port->bulk_in_endpointAddress),
239                           port->bulk_in_buffer,
240                           port->bulk_in_size,
241                           ipw_read_bulk_callback, port);
242         result = usb_submit_urb(port->read_urb, GFP_KERNEL);
243         if (result < 0)
244                 dbg("%s - usb_submit_urb(read bulk) failed with status %d",
245                                                         __func__, result);
246
247         /*--3: Tell the modem to open the floodgates on the rx bulk channel */
248         dbg("%s:asking modem for RxRead (RXBULK_ON)", __func__);
249         result = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
250                          IPW_SIO_RXCTL,
251                          USB_TYPE_VENDOR | USB_RECIP_INTERFACE | USB_DIR_OUT,
252                          IPW_RXBULK_ON,
253                          0, /* index */
254                          NULL,
255                          0,
256                          100000);
257         if (result < 0)
258                 dev_err(&port->dev,
259                         "Enabling bulk RxRead failed (error = %d)\n", result);
260
261         /*--4: setup the initial flowcontrol */
262         dbg("%s:setting init flowcontrol (%s)", __func__, buf_flow_init);
263         result = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
264                          IPW_SIO_HANDFLOW,
265                          USB_TYPE_VENDOR | USB_RECIP_INTERFACE | USB_DIR_OUT,
266                          0,
267                          0,
268                          buf_flow_init,
269                          0x10,
270                          200000);
271         if (result < 0)
272                 dev_err(&port->dev,
273                         "initial flowcontrol failed (error = %d)\n", result);
274
275
276         /*--5: raise the dtr */
277         dbg("%s:raising dtr", __func__);
278         result = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
279                          IPW_SIO_SET_PIN,
280                          USB_TYPE_VENDOR | USB_RECIP_INTERFACE | USB_DIR_OUT,
281                          IPW_PIN_SETDTR,
282                          0,
283                          NULL,
284                          0,
285                          200000);
286         if (result < 0)
287                 dev_err(&port->dev,
288                                 "setting dtr failed (error = %d)\n", result);
289
290         /*--6: raise the rts */
291         dbg("%s:raising rts", __func__);
292         result = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
293                          IPW_SIO_SET_PIN,
294                          USB_TYPE_VENDOR | USB_RECIP_INTERFACE | USB_DIR_OUT,
295                          IPW_PIN_SETRTS,
296                          0,
297                          NULL,
298                          0,
299                          200000);
300         if (result < 0)
301                 dev_err(&port->dev,
302                                 "setting dtr failed (error = %d)\n", result);
303
304         kfree(buf_flow_init);
305         return 0;
306 }
307
308 static void ipw_close(struct tty_struct *tty,
309                         struct usb_serial_port *port, struct file *filp)
310 {
311         struct usb_device *dev = port->serial->dev;
312         int result;
313
314         if (tty_hung_up_p(filp)) {
315                 dbg("%s: tty_hung_up_p ...", __func__);
316                 return;
317         }
318
319         /*--1: drop the dtr */
320         dbg("%s:dropping dtr", __func__);
321         result = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
322                          IPW_SIO_SET_PIN,
323                          USB_TYPE_VENDOR | USB_RECIP_INTERFACE | USB_DIR_OUT,
324                          IPW_PIN_CLRDTR,
325                          0,
326                          NULL,
327                          0,
328                          200000);
329         if (result < 0)
330                 dev_err(&port->dev, "dropping dtr failed (error = %d)\n",
331                                                                 result);
332
333         /*--2: drop the rts */
334         dbg("%s:dropping rts", __func__);
335         result = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
336                          IPW_SIO_SET_PIN, USB_TYPE_VENDOR |
337                                         USB_RECIP_INTERFACE | USB_DIR_OUT,
338                          IPW_PIN_CLRRTS,
339                          0,
340                          NULL,
341                          0,
342                          200000);
343         if (result < 0)
344                 dev_err(&port->dev,
345                                 "dropping rts failed (error = %d)\n", result);
346
347
348         /*--3: purge */
349         dbg("%s:sending purge", __func__);
350         result = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
351                          IPW_SIO_PURGE, USB_TYPE_VENDOR |
352                                         USB_RECIP_INTERFACE | USB_DIR_OUT,
353                          0x03,
354                          0,
355                          NULL,
356                          0,
357                          200000);
358         if (result < 0)
359                 dev_err(&port->dev, "purge failed (error = %d)\n", result);
360
361
362         /* send RXBULK_off (tell modem to stop transmitting bulk data on
363            rx chan) */
364         result = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
365                          IPW_SIO_RXCTL,
366                          USB_TYPE_VENDOR | USB_RECIP_INTERFACE | USB_DIR_OUT,
367                          IPW_RXBULK_OFF,
368                          0, /* index */
369                          NULL,
370                          0,
371                          100000);
372
373         if (result < 0)
374                 dev_err(&port->dev,
375                         "Disabling bulk RxRead failed (error = %d)\n", result);
376
377         /* shutdown any in-flight urbs that we know about */
378         usb_kill_urb(port->read_urb);
379         usb_kill_urb(port->write_urb);
380 }
381
382 static void ipw_write_bulk_callback(struct urb *urb)
383 {
384         struct usb_serial_port *port = urb->context;
385         int status = urb->status;
386
387         dbg("%s", __func__);
388
389         port->write_urb_busy = 0;
390
391         if (status)
392                 dbg("%s - nonzero write bulk status received: %d",
393                     __func__, status);
394
395         usb_serial_port_softint(port);
396 }
397
398 static int ipw_write(struct tty_struct *tty, struct usb_serial_port *port,
399                                         const unsigned char *buf, int count)
400 {
401         struct usb_device *dev = port->serial->dev;
402         int ret;
403
404         dbg("%s: TOP: count=%d, in_interrupt=%ld", __func__,
405                 count, in_interrupt());
406
407         if (count == 0) {
408                 dbg("%s - write request of 0 bytes", __func__);
409                 return 0;
410         }
411
412         spin_lock_bh(&port->lock);
413         if (port->write_urb_busy) {
414                 spin_unlock_bh(&port->lock);
415                 dbg("%s - already writing", __func__);
416                 return 0;
417         }
418         port->write_urb_busy = 1;
419         spin_unlock_bh(&port->lock);
420
421         count = min(count, port->bulk_out_size);
422         memcpy(port->bulk_out_buffer, buf, count);
423
424         dbg("%s count now:%d", __func__, count);
425
426         usb_fill_bulk_urb(port->write_urb, dev,
427                           usb_sndbulkpipe(dev, port->bulk_out_endpointAddress),
428                           port->write_urb->transfer_buffer,
429                           count,
430                           ipw_write_bulk_callback,
431                           port);
432
433         ret = usb_submit_urb(port->write_urb, GFP_ATOMIC);
434         if (ret != 0) {
435                 port->write_urb_busy = 0;
436                 dbg("%s - usb_submit_urb(write bulk) failed with error = %d",
437                                                                 __func__, ret);
438                 return ret;
439         }
440
441         dbg("%s returning %d", __func__, count);
442         return count;
443 }
444
445 static int ipw_probe(struct usb_serial_port *port)
446 {
447         return 0;
448 }
449
450 static int ipw_disconnect(struct usb_serial_port *port)
451 {
452         usb_set_serial_port_data(port, NULL);
453         return 0;
454 }
455
456 static struct usb_serial_driver ipw_device = {
457         .driver = {
458                 .owner =        THIS_MODULE,
459                 .name =         "ipw",
460         },
461         .description =          "IPWireless converter",
462         .usb_driver =           &usb_ipw_driver,
463         .id_table =             usb_ipw_ids,
464         .num_ports =            1,
465         .open =                 ipw_open,
466         .close =                ipw_close,
467         .port_probe =           ipw_probe,
468         .port_remove =          ipw_disconnect,
469         .write =                ipw_write,
470         .write_bulk_callback =  ipw_write_bulk_callback,
471         .read_bulk_callback =   ipw_read_bulk_callback,
472 };
473
474
475
476 static int usb_ipw_init(void)
477 {
478         int retval;
479
480         retval = usb_serial_register(&ipw_device);
481         if (retval)
482                 return retval;
483         retval = usb_register(&usb_ipw_driver);
484         if (retval) {
485                 usb_serial_deregister(&ipw_device);
486                 return retval;
487         }
488         info(DRIVER_DESC " " DRIVER_VERSION);
489         return 0;
490 }
491
492 static void usb_ipw_exit(void)
493 {
494         usb_deregister(&usb_ipw_driver);
495         usb_serial_deregister(&ipw_device);
496 }
497
498 module_init(usb_ipw_init);
499 module_exit(usb_ipw_exit);
500
501 /* Module information */
502 MODULE_AUTHOR(DRIVER_AUTHOR);
503 MODULE_DESCRIPTION(DRIVER_DESC);
504 MODULE_LICENSE("GPL");
505
506 module_param(debug, bool, S_IRUGO | S_IWUSR);
507 MODULE_PARM_DESC(debug, "Debug enabled or not");