blob: 537f953bd7f8013c3cd97b5fc269252e5f6e235a [file] [log] [blame]
Manuel Francisco Naranjo3fe70ba2006-08-09 16:35:12 -03001/*
2 * AIRcable USB Bluetooth Dongle Driver.
3 *
4 * Copyright (C) 2006 Manuel Francisco Naranjo (naranjo.manuel@gmail.com)
5 * This program is free software; you can redistribute it and/or modify it under
6 * the terms of the GNU General Public License version 2 as published by the
7 * Free Software Foundation.
8 *
9 * The device works as an standard CDC device, it has 2 interfaces, the first
10 * one is for firmware access and the second is the serial one.
11 * The protocol is very simply, there are two posibilities reading or writing.
Robert P. J. Daybeb7dd82007-05-09 07:14:03 +020012 * When writing the first urb must have a Header that starts with 0x20 0x29 the
Manuel Francisco Naranjo3fe70ba2006-08-09 16:35:12 -030013 * next two bytes must say how much data will be sended.
14 * When reading the process is almost equal except that the header starts with
15 * 0x00 0x20.
16 *
17 * The device simply need some stuff to understand data comming from the usb
18 * buffer: The First and Second byte is used for a Header, the Third and Fourth
19 * tells the device the amount of information the package holds.
20 * Packages are 60 bytes long Header Stuff.
Robert P. J. Daybeb7dd82007-05-09 07:14:03 +020021 * When writing to the device the first two bytes of the header are 0x20 0x29
Manuel Francisco Naranjo3fe70ba2006-08-09 16:35:12 -030022 * When reading the bytes are 0x00 0x20, or 0x00 0x10, there is an strange
23 * situation, when too much data arrives to the device because it sends the data
24 * but with out the header. I will use a simply hack to override this situation,
25 * if there is data coming that does not contain any header, then that is data
26 * that must go directly to the tty, as there is no documentation about if there
27 * is any other control code, I will simply check for the first
28 * one.
29 *
30 * The driver registers himself with the USB-serial core and the USB Core. I had
31 * to implement a probe function agains USB-serial, because other way, the
32 * driver was attaching himself to both interfaces. I have tryed with different
33 * configurations of usb_serial_driver with out exit, only the probe function
34 * could handle this correctly.
35 *
36 * I have taken some info from a Greg Kroah-Hartman article:
37 * http://www.linuxjournal.com/article/6573
38 * And from Linux Device Driver Kit CD, which is a great work, the authors taken
39 * the work to recompile lots of information an knowladge in drivers development
40 * and made it all avaible inside a cd.
41 * URL: http://kernel.org/pub/linux/kernel/people/gregkh/ddk/
42 *
43 */
44
45#include <linux/tty.h>
46#include <linux/tty_flip.h>
47#include <linux/circ_buf.h>
48#include <linux/usb.h>
49#include <linux/usb/serial.h>
50
51static int debug;
52
53/* Vendor and Product ID */
54#define AIRCABLE_VID 0x16CA
55#define AIRCABLE_USB_PID 0x1502
56
57/* write buffer size defines */
58#define AIRCABLE_BUF_SIZE 2048
59
60/* Protocol Stuff */
61#define HCI_HEADER_LENGTH 0x4
62#define TX_HEADER_0 0x20
63#define TX_HEADER_1 0x29
64#define RX_HEADER_0 0x00
65#define RX_HEADER_1 0x20
66#define MAX_HCI_FRAMESIZE 60
67#define HCI_COMPLETE_FRAME 64
68
69/* rx_flags */
70#define THROTTLED 0x01
71#define ACTUALLY_THROTTLED 0x02
72
73/*
74 * Version Information
75 */
76#define DRIVER_VERSION "v1.0b2"
77#define DRIVER_AUTHOR "Naranjo, Manuel Francisco <naranjo.manuel@gmail.com>"
78#define DRIVER_DESC "AIRcable USB Driver"
79
80/* ID table that will be registered with USB core */
81static struct usb_device_id id_table [] = {
82 { USB_DEVICE(AIRCABLE_VID, AIRCABLE_USB_PID) },
83 { },
84};
85MODULE_DEVICE_TABLE(usb, id_table);
86
87
88/* Internal Structure */
89struct aircable_private {
90 spinlock_t rx_lock; /* spinlock for the receive lines */
91 struct circ_buf *tx_buf; /* write buffer */
92 struct circ_buf *rx_buf; /* read buffer */
93 int rx_flags; /* for throttilng */
94 struct work_struct rx_work; /* work cue for the receiving line */
David Howellsc4028952006-11-22 14:57:56 +000095 struct usb_serial_port *port; /* USB port with which associated */
Manuel Francisco Naranjo3fe70ba2006-08-09 16:35:12 -030096};
97
98/* Private methods */
99
100/* Circular Buffer Methods, code from ti_usb_3410_5052 used */
101/*
102 * serial_buf_clear
103 *
104 * Clear out all data in the circular buffer.
105 */
106static void serial_buf_clear(struct circ_buf *cb)
107{
108 cb->head = cb->tail = 0;
109}
110
111/*
112 * serial_buf_alloc
113 *
114 * Allocate a circular buffer and all associated memory.
115 */
116static struct circ_buf *serial_buf_alloc(void)
117{
118 struct circ_buf *cb;
119 cb = kmalloc(sizeof(struct circ_buf), GFP_KERNEL);
120 if (cb == NULL)
121 return NULL;
122 cb->buf = kmalloc(AIRCABLE_BUF_SIZE, GFP_KERNEL);
123 if (cb->buf == NULL) {
124 kfree(cb);
125 return NULL;
126 }
127 serial_buf_clear(cb);
128 return cb;
129}
130
131/*
132 * serial_buf_free
133 *
134 * Free the buffer and all associated memory.
135 */
136static void serial_buf_free(struct circ_buf *cb)
137{
138 kfree(cb->buf);
139 kfree(cb);
140}
141
142/*
143 * serial_buf_data_avail
144 *
145 * Return the number of bytes of data available in the circular
146 * buffer.
147 */
148static int serial_buf_data_avail(struct circ_buf *cb)
149{
Alan Coxc4d0f8c2008-04-29 14:35:39 +0100150 return CIRC_CNT(cb->head, cb->tail, AIRCABLE_BUF_SIZE);
Manuel Francisco Naranjo3fe70ba2006-08-09 16:35:12 -0300151}
152
153/*
154 * serial_buf_put
155 *
156 * Copy data data from a user buffer and put it into the circular buffer.
157 * Restrict to the amount of space available.
158 *
159 * Return the number of bytes copied.
160 */
161static int serial_buf_put(struct circ_buf *cb, const char *buf, int count)
162{
163 int c, ret = 0;
164 while (1) {
165 c = CIRC_SPACE_TO_END(cb->head, cb->tail, AIRCABLE_BUF_SIZE);
166 if (count < c)
167 c = count;
168 if (c <= 0)
169 break;
170 memcpy(cb->buf + cb->head, buf, c);
171 cb->head = (cb->head + c) & (AIRCABLE_BUF_SIZE-1);
172 buf += c;
173 count -= c;
Alan Coxc4d0f8c2008-04-29 14:35:39 +0100174 ret = c;
Manuel Francisco Naranjo3fe70ba2006-08-09 16:35:12 -0300175 }
176 return ret;
177}
178
179/*
180 * serial_buf_get
181 *
182 * Get data from the circular buffer and copy to the given buffer.
183 * Restrict to the amount of data available.
184 *
185 * Return the number of bytes copied.
186 */
187static int serial_buf_get(struct circ_buf *cb, char *buf, int count)
188{
189 int c, ret = 0;
190 while (1) {
191 c = CIRC_CNT_TO_END(cb->head, cb->tail, AIRCABLE_BUF_SIZE);
192 if (count < c)
193 c = count;
194 if (c <= 0)
195 break;
196 memcpy(buf, cb->buf + cb->tail, c);
197 cb->tail = (cb->tail + c) & (AIRCABLE_BUF_SIZE-1);
198 buf += c;
199 count -= c;
Alan Coxc4d0f8c2008-04-29 14:35:39 +0100200 ret = c;
Manuel Francisco Naranjo3fe70ba2006-08-09 16:35:12 -0300201 }
202 return ret;
203}
204
205/* End of circula buffer methods */
206
207static void aircable_send(struct usb_serial_port *port)
208{
209 int count, result;
210 struct aircable_private *priv = usb_get_serial_port_data(port);
Alan Coxc4d0f8c2008-04-29 14:35:39 +0100211 unsigned char *buf;
Al Virofd05e722008-04-28 07:00:16 +0100212 __le16 *dbuf;
Harvey Harrison441b62c2008-03-03 16:08:34 -0800213 dbg("%s - port %d", __func__, port->number);
Manuel Francisco Naranjo3fe70ba2006-08-09 16:35:12 -0300214 if (port->write_urb_busy)
215 return;
216
217 count = min(serial_buf_data_avail(priv->tx_buf), MAX_HCI_FRAMESIZE);
218 if (count == 0)
219 return;
220
221 buf = kzalloc(count + HCI_HEADER_LENGTH, GFP_ATOMIC);
222 if (!buf) {
Greg Kroah-Hartman194343d2008-08-20 16:56:34 -0700223 dev_err(&port->dev, "%s- kzalloc(%d) failed.\n",
224 __func__, count + HCI_HEADER_LENGTH);
Manuel Francisco Naranjo3fe70ba2006-08-09 16:35:12 -0300225 return;
226 }
227
228 buf[0] = TX_HEADER_0;
229 buf[1] = TX_HEADER_1;
Al Virofd05e722008-04-28 07:00:16 +0100230 dbuf = (__le16 *)&buf[2];
Oliver Neukumb19d4022007-03-26 16:55:16 +0200231 *dbuf = cpu_to_le16((u16)count);
Alan Coxc4d0f8c2008-04-29 14:35:39 +0100232 serial_buf_get(priv->tx_buf, buf + HCI_HEADER_LENGTH,
233 MAX_HCI_FRAMESIZE);
Manuel Francisco Naranjo3fe70ba2006-08-09 16:35:12 -0300234
235 memcpy(port->write_urb->transfer_buffer, buf,
236 count + HCI_HEADER_LENGTH);
237
238 kfree(buf);
239 port->write_urb_busy = 1;
Harvey Harrison441b62c2008-03-03 16:08:34 -0800240 usb_serial_debug_data(debug, &port->dev, __func__,
Manuel Francisco Naranjo3fe70ba2006-08-09 16:35:12 -0300241 count + HCI_HEADER_LENGTH,
242 port->write_urb->transfer_buffer);
243 port->write_urb->transfer_buffer_length = count + HCI_HEADER_LENGTH;
244 port->write_urb->dev = port->serial->dev;
245 result = usb_submit_urb(port->write_urb, GFP_ATOMIC);
246
247 if (result) {
248 dev_err(&port->dev,
249 "%s - failed submitting write urb, error %d\n",
Harvey Harrison441b62c2008-03-03 16:08:34 -0800250 __func__, result);
Manuel Francisco Naranjo3fe70ba2006-08-09 16:35:12 -0300251 port->write_urb_busy = 0;
252 }
253
254 schedule_work(&port->work);
255}
256
David Howellsc4028952006-11-22 14:57:56 +0000257static void aircable_read(struct work_struct *work)
Manuel Francisco Naranjo3fe70ba2006-08-09 16:35:12 -0300258{
David Howellsc4028952006-11-22 14:57:56 +0000259 struct aircable_private *priv =
260 container_of(work, struct aircable_private, rx_work);
261 struct usb_serial_port *port = priv->port;
Manuel Francisco Naranjo3fe70ba2006-08-09 16:35:12 -0300262 struct tty_struct *tty;
263 unsigned char *data;
264 int count;
Alan Coxc4d0f8c2008-04-29 14:35:39 +0100265 if (priv->rx_flags & THROTTLED) {
Manuel Francisco Naranjo3fe70ba2006-08-09 16:35:12 -0300266 if (priv->rx_flags & ACTUALLY_THROTTLED)
267 schedule_work(&priv->rx_work);
268 return;
269 }
270
271 /* By now I will flush data to the tty in packages of no more than
272 * 64 bytes, to ensure I do not get throttled.
273 * Ask USB mailing list for better aproach.
274 */
Alan Cox4a90f092008-10-13 10:39:46 +0100275 tty = tty_port_tty_get(&port->port);
Manuel Francisco Naranjo3fe70ba2006-08-09 16:35:12 -0300276
Naranjo Manuel Francisco7a5c7b42006-11-15 15:14:27 -0300277 if (!tty) {
Manuel Francisco Naranjo3fe70ba2006-08-09 16:35:12 -0300278 schedule_work(&priv->rx_work);
Greg Kroah-Hartman194343d2008-08-20 16:56:34 -0700279 dev_err(&port->dev, "%s - No tty available\n", __func__);
Naranjo Manuel Francisco7a5c7b42006-11-15 15:14:27 -0300280 return ;
281 }
Manuel Francisco Naranjo3fe70ba2006-08-09 16:35:12 -0300282
283 count = min(64, serial_buf_data_avail(priv->rx_buf));
284
285 if (count <= 0)
Alan Cox4a90f092008-10-13 10:39:46 +0100286 goto out; /* We have finished sending everything. */
Manuel Francisco Naranjo3fe70ba2006-08-09 16:35:12 -0300287
288 tty_prepare_flip_string(tty, &data, count);
Alan Coxc4d0f8c2008-04-29 14:35:39 +0100289 if (!data) {
Alan Cox4a90f092008-10-13 10:39:46 +0100290 dev_err(&port->dev, "%s- kzalloc(%d) failed.",
291 __func__, count);
292 goto out;
Manuel Francisco Naranjo3fe70ba2006-08-09 16:35:12 -0300293 }
294
295 serial_buf_get(priv->rx_buf, data, count);
296
297 tty_flip_buffer_push(tty);
298
299 if (serial_buf_data_avail(priv->rx_buf))
300 schedule_work(&priv->rx_work);
Alan Cox4a90f092008-10-13 10:39:46 +0100301out:
302 tty_kref_put(tty);
Manuel Francisco Naranjo3fe70ba2006-08-09 16:35:12 -0300303 return;
304}
305/* End of private methods */
306
307static int aircable_probe(struct usb_serial *serial,
308 const struct usb_device_id *id)
309{
Alan Coxc4d0f8c2008-04-29 14:35:39 +0100310 struct usb_host_interface *iface_desc = serial->interface->
311 cur_altsetting;
Manuel Francisco Naranjo3fe70ba2006-08-09 16:35:12 -0300312 struct usb_endpoint_descriptor *endpoint;
Alan Coxc4d0f8c2008-04-29 14:35:39 +0100313 int num_bulk_out = 0;
Manuel Francisco Naranjo3fe70ba2006-08-09 16:35:12 -0300314 int i;
315
316 for (i = 0; i < iface_desc->desc.bNumEndpoints; i++) {
317 endpoint = &iface_desc->endpoint[i].desc;
Luiz Fernando N. Capitulino377f13b2006-10-26 13:02:45 -0300318 if (usb_endpoint_is_bulk_out(endpoint)) {
Manuel Francisco Naranjo3fe70ba2006-08-09 16:35:12 -0300319 dbg("found bulk out on endpoint %d", i);
320 ++num_bulk_out;
321 }
322 }
323
324 if (num_bulk_out == 0) {
325 dbg("Invalid interface, discarding");
326 return -ENODEV;
327 }
328
329 return 0;
330}
331
Alan Coxc4d0f8c2008-04-29 14:35:39 +0100332static int aircable_attach(struct usb_serial *serial)
Manuel Francisco Naranjo3fe70ba2006-08-09 16:35:12 -0300333{
334 struct usb_serial_port *port = serial->port[0];
335 struct aircable_private *priv;
336
337 priv = kzalloc(sizeof(struct aircable_private), GFP_KERNEL);
Alan Coxc4d0f8c2008-04-29 14:35:39 +0100338 if (!priv) {
Greg Kroah-Hartman194343d2008-08-20 16:56:34 -0700339 dev_err(&port->dev, "%s- kmalloc(%Zd) failed.\n", __func__,
Manuel Francisco Naranjo3fe70ba2006-08-09 16:35:12 -0300340 sizeof(struct aircable_private));
341 return -ENOMEM;
342 }
343
344 /* Allocation of Circular Buffers */
345 priv->tx_buf = serial_buf_alloc();
346 if (priv->tx_buf == NULL) {
347 kfree(priv);
348 return -ENOMEM;
349 }
350
351 priv->rx_buf = serial_buf_alloc();
352 if (priv->rx_buf == NULL) {
353 kfree(priv->tx_buf);
354 kfree(priv);
355 return -ENOMEM;
356 }
357
358 priv->rx_flags &= ~(THROTTLED | ACTUALLY_THROTTLED);
David Howellsc4028952006-11-22 14:57:56 +0000359 priv->port = port;
360 INIT_WORK(&priv->rx_work, aircable_read);
Manuel Francisco Naranjo3fe70ba2006-08-09 16:35:12 -0300361
362 usb_set_serial_port_data(serial->port[0], priv);
363
364 return 0;
365}
366
367static void aircable_shutdown(struct usb_serial *serial)
368{
369
370 struct usb_serial_port *port = serial->port[0];
371 struct aircable_private *priv = usb_get_serial_port_data(port);
372
Harvey Harrison441b62c2008-03-03 16:08:34 -0800373 dbg("%s", __func__);
Manuel Francisco Naranjo3fe70ba2006-08-09 16:35:12 -0300374
375 if (priv) {
376 serial_buf_free(priv->tx_buf);
377 serial_buf_free(priv->rx_buf);
378 usb_set_serial_port_data(port, NULL);
379 kfree(priv);
380 }
381}
382
Alan Cox95da3102008-07-22 11:09:07 +0100383static int aircable_write_room(struct tty_struct *tty)
Manuel Francisco Naranjo3fe70ba2006-08-09 16:35:12 -0300384{
Alan Cox95da3102008-07-22 11:09:07 +0100385 struct usb_serial_port *port = tty->driver_data;
Manuel Francisco Naranjo3fe70ba2006-08-09 16:35:12 -0300386 struct aircable_private *priv = usb_get_serial_port_data(port);
387 return serial_buf_data_avail(priv->tx_buf);
388}
389
Alan Cox95da3102008-07-22 11:09:07 +0100390static int aircable_write(struct tty_struct *tty, struct usb_serial_port *port,
Manuel Francisco Naranjo3fe70ba2006-08-09 16:35:12 -0300391 const unsigned char *source, int count)
392{
393 struct aircable_private *priv = usb_get_serial_port_data(port);
394 int temp;
395
Harvey Harrison441b62c2008-03-03 16:08:34 -0800396 dbg("%s - port %d, %d bytes", __func__, port->number, count);
Manuel Francisco Naranjo3fe70ba2006-08-09 16:35:12 -0300397
Harvey Harrison441b62c2008-03-03 16:08:34 -0800398 usb_serial_debug_data(debug, &port->dev, __func__, count, source);
Manuel Francisco Naranjo3fe70ba2006-08-09 16:35:12 -0300399
Alan Coxc4d0f8c2008-04-29 14:35:39 +0100400 if (!count) {
Harvey Harrison441b62c2008-03-03 16:08:34 -0800401 dbg("%s - write request of 0 bytes", __func__);
Manuel Francisco Naranjo3fe70ba2006-08-09 16:35:12 -0300402 return count;
403 }
404
405 temp = serial_buf_put(priv->tx_buf, source, count);
406
407 aircable_send(port);
408
409 if (count > AIRCABLE_BUF_SIZE)
410 count = AIRCABLE_BUF_SIZE;
411
412 return count;
413
414}
415
David Howells7d12e782006-10-05 14:55:46 +0100416static void aircable_write_bulk_callback(struct urb *urb)
Manuel Francisco Naranjo3fe70ba2006-08-09 16:35:12 -0300417{
418 struct usb_serial_port *port = urb->context;
Greg Kroah-Hartman1373dbb2007-06-15 15:44:13 -0700419 int status = urb->status;
Manuel Francisco Naranjo3fe70ba2006-08-09 16:35:12 -0300420 int result;
421
Harvey Harrison441b62c2008-03-03 16:08:34 -0800422 dbg("%s - urb status: %d", __func__ , status);
Manuel Francisco Naranjo3fe70ba2006-08-09 16:35:12 -0300423
424 /* This has been taken from cypress_m8.c cypress_write_int_callback */
Greg Kroah-Hartman1373dbb2007-06-15 15:44:13 -0700425 switch (status) {
Alan Coxc4d0f8c2008-04-29 14:35:39 +0100426 case 0:
427 /* success */
428 break;
429 case -ECONNRESET:
430 case -ENOENT:
431 case -ESHUTDOWN:
432 /* this urb is terminated, clean up */
433 dbg("%s - urb shutting down with status: %d",
434 __func__, status);
435 port->write_urb_busy = 0;
436 return;
437 default:
438 /* error in the urb, so we have to resubmit it */
439 dbg("%s - Overflow in write", __func__);
440 dbg("%s - nonzero write bulk status received: %d",
441 __func__, status);
442 port->write_urb->transfer_buffer_length = 1;
443 port->write_urb->dev = port->serial->dev;
444 result = usb_submit_urb(port->write_urb, GFP_ATOMIC);
445 if (result)
446 dev_err(&urb->dev->dev,
447 "%s - failed resubmitting write urb, error %d\n",
448 __func__, result);
449 else
Manuel Francisco Naranjo3fe70ba2006-08-09 16:35:12 -0300450 return;
Manuel Francisco Naranjo3fe70ba2006-08-09 16:35:12 -0300451 }
452
453 port->write_urb_busy = 0;
454
455 aircable_send(port);
456}
457
David Howells7d12e782006-10-05 14:55:46 +0100458static void aircable_read_bulk_callback(struct urb *urb)
Manuel Francisco Naranjo3fe70ba2006-08-09 16:35:12 -0300459{
460 struct usb_serial_port *port = urb->context;
461 struct aircable_private *priv = usb_get_serial_port_data(port);
462 struct tty_struct *tty;
463 unsigned long no_packages, remaining, package_length, i;
464 int result, shift = 0;
465 unsigned char *temp;
Greg Kroah-Hartman1373dbb2007-06-15 15:44:13 -0700466 int status = urb->status;
Manuel Francisco Naranjo3fe70ba2006-08-09 16:35:12 -0300467
Harvey Harrison441b62c2008-03-03 16:08:34 -0800468 dbg("%s - port %d", __func__, port->number);
Manuel Francisco Naranjo3fe70ba2006-08-09 16:35:12 -0300469
Greg Kroah-Hartman1373dbb2007-06-15 15:44:13 -0700470 if (status) {
Harvey Harrison441b62c2008-03-03 16:08:34 -0800471 dbg("%s - urb status = %d", __func__, status);
Alan Cox95da3102008-07-22 11:09:07 +0100472 if (!port->port.count) {
Harvey Harrison441b62c2008-03-03 16:08:34 -0800473 dbg("%s - port is closed, exiting.", __func__);
Manuel Francisco Naranjo3fe70ba2006-08-09 16:35:12 -0300474 return;
475 }
Greg Kroah-Hartman1373dbb2007-06-15 15:44:13 -0700476 if (status == -EPROTO) {
Manuel Francisco Naranjo3fe70ba2006-08-09 16:35:12 -0300477 dbg("%s - caught -EPROTO, resubmitting the urb",
Harvey Harrison441b62c2008-03-03 16:08:34 -0800478 __func__);
Manuel Francisco Naranjo3fe70ba2006-08-09 16:35:12 -0300479 usb_fill_bulk_urb(port->read_urb, port->serial->dev,
Alan Coxc4d0f8c2008-04-29 14:35:39 +0100480 usb_rcvbulkpipe(port->serial->dev,
481 port->bulk_in_endpointAddress),
482 port->read_urb->transfer_buffer,
483 port->read_urb->transfer_buffer_length,
484 aircable_read_bulk_callback, port);
Manuel Francisco Naranjo3fe70ba2006-08-09 16:35:12 -0300485
486 result = usb_submit_urb(urb, GFP_ATOMIC);
487 if (result)
488 dev_err(&urb->dev->dev,
489 "%s - failed resubmitting read urb, error %d\n",
Harvey Harrison441b62c2008-03-03 16:08:34 -0800490 __func__, result);
Manuel Francisco Naranjo3fe70ba2006-08-09 16:35:12 -0300491 return;
492 }
Harvey Harrison441b62c2008-03-03 16:08:34 -0800493 dbg("%s - unable to handle the error, exiting.", __func__);
Manuel Francisco Naranjo3fe70ba2006-08-09 16:35:12 -0300494 return;
495 }
496
Harvey Harrison441b62c2008-03-03 16:08:34 -0800497 usb_serial_debug_data(debug, &port->dev, __func__,
Alan Coxc4d0f8c2008-04-29 14:35:39 +0100498 urb->actual_length, urb->transfer_buffer);
Manuel Francisco Naranjo3fe70ba2006-08-09 16:35:12 -0300499
Alan Cox4a90f092008-10-13 10:39:46 +0100500 tty = tty_port_tty_get(&port->port);
Manuel Francisco Naranjo3fe70ba2006-08-09 16:35:12 -0300501 if (tty && urb->actual_length) {
502 if (urb->actual_length <= 2) {
503 /* This is an incomplete package */
504 serial_buf_put(priv->rx_buf, urb->transfer_buffer,
505 urb->actual_length);
506 } else {
507 temp = urb->transfer_buffer;
508 if (temp[0] == RX_HEADER_0)
509 shift = HCI_HEADER_LENGTH;
510
511 remaining = urb->actual_length;
512 no_packages = urb->actual_length / (HCI_COMPLETE_FRAME);
513
514 if (urb->actual_length % HCI_COMPLETE_FRAME != 0)
Alan Coxc4d0f8c2008-04-29 14:35:39 +0100515 no_packages++;
Manuel Francisco Naranjo3fe70ba2006-08-09 16:35:12 -0300516
Alan Coxc4d0f8c2008-04-29 14:35:39 +0100517 for (i = 0; i < no_packages; i++) {
Manuel Francisco Naranjo3fe70ba2006-08-09 16:35:12 -0300518 if (remaining > (HCI_COMPLETE_FRAME))
519 package_length = HCI_COMPLETE_FRAME;
520 else
521 package_length = remaining;
522 remaining -= package_length;
523
524 serial_buf_put(priv->rx_buf,
525 urb->transfer_buffer + shift +
526 (HCI_COMPLETE_FRAME) * (i),
527 package_length - shift);
528 }
529 }
David Howellsc4028952006-11-22 14:57:56 +0000530 aircable_read(&priv->rx_work);
Manuel Francisco Naranjo3fe70ba2006-08-09 16:35:12 -0300531 }
Alan Cox4a90f092008-10-13 10:39:46 +0100532 tty_kref_put(tty);
Manuel Francisco Naranjo3fe70ba2006-08-09 16:35:12 -0300533
534 /* Schedule the next read _if_ we are still open */
Alan Cox95da3102008-07-22 11:09:07 +0100535 if (port->port.count) {
Manuel Francisco Naranjo3fe70ba2006-08-09 16:35:12 -0300536 usb_fill_bulk_urb(port->read_urb, port->serial->dev,
537 usb_rcvbulkpipe(port->serial->dev,
Alan Coxc4d0f8c2008-04-29 14:35:39 +0100538 port->bulk_in_endpointAddress),
Manuel Francisco Naranjo3fe70ba2006-08-09 16:35:12 -0300539 port->read_urb->transfer_buffer,
540 port->read_urb->transfer_buffer_length,
541 aircable_read_bulk_callback, port);
542
543 result = usb_submit_urb(urb, GFP_ATOMIC);
544 if (result)
545 dev_err(&urb->dev->dev,
546 "%s - failed resubmitting read urb, error %d\n",
Harvey Harrison441b62c2008-03-03 16:08:34 -0800547 __func__, result);
Manuel Francisco Naranjo3fe70ba2006-08-09 16:35:12 -0300548 }
549
550 return;
551}
552
553/* Based on ftdi_sio.c throttle */
Alan Cox95da3102008-07-22 11:09:07 +0100554static void aircable_throttle(struct tty_struct *tty)
Manuel Francisco Naranjo3fe70ba2006-08-09 16:35:12 -0300555{
Alan Cox95da3102008-07-22 11:09:07 +0100556 struct usb_serial_port *port = tty->driver_data;
Manuel Francisco Naranjo3fe70ba2006-08-09 16:35:12 -0300557 struct aircable_private *priv = usb_get_serial_port_data(port);
558 unsigned long flags;
559
Harvey Harrison441b62c2008-03-03 16:08:34 -0800560 dbg("%s - port %d", __func__, port->number);
Manuel Francisco Naranjo3fe70ba2006-08-09 16:35:12 -0300561
562 spin_lock_irqsave(&priv->rx_lock, flags);
563 priv->rx_flags |= THROTTLED;
564 spin_unlock_irqrestore(&priv->rx_lock, flags);
565}
566
567/* Based on ftdi_sio.c unthrottle */
Alan Cox95da3102008-07-22 11:09:07 +0100568static void aircable_unthrottle(struct tty_struct *tty)
Manuel Francisco Naranjo3fe70ba2006-08-09 16:35:12 -0300569{
Alan Cox95da3102008-07-22 11:09:07 +0100570 struct usb_serial_port *port = tty->driver_data;
Manuel Francisco Naranjo3fe70ba2006-08-09 16:35:12 -0300571 struct aircable_private *priv = usb_get_serial_port_data(port);
572 int actually_throttled;
573 unsigned long flags;
574
Harvey Harrison441b62c2008-03-03 16:08:34 -0800575 dbg("%s - port %d", __func__, port->number);
Manuel Francisco Naranjo3fe70ba2006-08-09 16:35:12 -0300576
577 spin_lock_irqsave(&priv->rx_lock, flags);
578 actually_throttled = priv->rx_flags & ACTUALLY_THROTTLED;
579 priv->rx_flags &= ~(THROTTLED | ACTUALLY_THROTTLED);
580 spin_unlock_irqrestore(&priv->rx_lock, flags);
581
582 if (actually_throttled)
583 schedule_work(&priv->rx_work);
584}
585
Johannes Hölzld9b1b782006-12-17 21:50:24 +0100586static struct usb_driver aircable_driver = {
587 .name = "aircable",
588 .probe = usb_serial_probe,
589 .disconnect = usb_serial_disconnect,
590 .id_table = id_table,
591 .no_dynamic_id = 1,
592};
593
Manuel Francisco Naranjo3fe70ba2006-08-09 16:35:12 -0300594static struct usb_serial_driver aircable_device = {
Johannes Hölzl52d67f02006-12-17 22:05:09 +0100595 .driver = {
596 .owner = THIS_MODULE,
597 .name = "aircable",
598 },
Johannes Hölzld9b1b782006-12-17 21:50:24 +0100599 .usb_driver = &aircable_driver,
Manuel Francisco Naranjo3fe70ba2006-08-09 16:35:12 -0300600 .id_table = id_table,
601 .num_ports = 1,
602 .attach = aircable_attach,
603 .probe = aircable_probe,
604 .shutdown = aircable_shutdown,
605 .write = aircable_write,
606 .write_room = aircable_write_room,
607 .write_bulk_callback = aircable_write_bulk_callback,
608 .read_bulk_callback = aircable_read_bulk_callback,
609 .throttle = aircable_throttle,
610 .unthrottle = aircable_unthrottle,
611};
612
Alan Coxc4d0f8c2008-04-29 14:35:39 +0100613static int __init aircable_init(void)
Manuel Francisco Naranjo3fe70ba2006-08-09 16:35:12 -0300614{
615 int retval;
616 retval = usb_serial_register(&aircable_device);
617 if (retval)
618 goto failed_serial_register;
619 retval = usb_register(&aircable_driver);
620 if (retval)
621 goto failed_usb_register;
622 return 0;
623
624failed_serial_register:
625 usb_serial_deregister(&aircable_device);
626failed_usb_register:
627 return retval;
628}
629
Alan Coxc4d0f8c2008-04-29 14:35:39 +0100630static void __exit aircable_exit(void)
Manuel Francisco Naranjo3fe70ba2006-08-09 16:35:12 -0300631{
632 usb_deregister(&aircable_driver);
633 usb_serial_deregister(&aircable_device);
634}
635
636MODULE_AUTHOR(DRIVER_AUTHOR);
637MODULE_DESCRIPTION(DRIVER_DESC);
638MODULE_VERSION(DRIVER_VERSION);
639MODULE_LICENSE("GPL");
640
641module_init(aircable_init);
642module_exit(aircable_exit);
643
644module_param(debug, bool, S_IRUGO | S_IWUSR);
645MODULE_PARM_DESC(debug, "Debug enabled or not");