Loading...
1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * USB IR Dongle driver
4 *
5 * Copyright (C) 2001-2002 Greg Kroah-Hartman (greg@kroah.com)
6 * Copyright (C) 2002 Gary Brubaker (xavyer@ix.netcom.com)
7 * Copyright (C) 2010 Johan Hovold (jhovold@gmail.com)
8 *
9 * This driver allows a USB IrDA device to be used as a "dumb" serial device.
10 * This can be useful if you do not have access to a full IrDA stack on the
11 * other side of the connection. If you do have an IrDA stack on both devices,
12 * please use the usb-irda driver, as it contains the proper error checking and
13 * other goodness of a full IrDA stack.
14 *
15 * Portions of this driver were taken from drivers/net/irda/irda-usb.c, which
16 * was written by Roman Weissgaerber <weissg@vienna.at>, Dag Brattli
17 * <dag@brattli.net>, and Jean Tourrilhes <jt@hpl.hp.com>
18 *
19 * See Documentation/usb/usb-serial.rst for more information on using this
20 * driver
21 */
22
23#include <linux/kernel.h>
24#include <linux/errno.h>
25#include <linux/init.h>
26#include <linux/slab.h>
27#include <linux/tty.h>
28#include <linux/tty_driver.h>
29#include <linux/tty_flip.h>
30#include <linux/module.h>
31#include <linux/spinlock.h>
32#include <linux/uaccess.h>
33#include <linux/usb.h>
34#include <linux/usb/serial.h>
35#include <linux/usb/irda.h>
36
37#define DRIVER_AUTHOR "Greg Kroah-Hartman <greg@kroah.com>, Johan Hovold <jhovold@gmail.com>"
38#define DRIVER_DESC "USB IR Dongle driver"
39
40/* if overridden by the user, then use their value for the size of the read and
41 * write urbs */
42static int buffer_size;
43
44/* if overridden by the user, then use the specified number of XBOFs */
45static int xbof = -1;
46
47static int ir_startup (struct usb_serial *serial);
48static int ir_write(struct tty_struct *tty, struct usb_serial_port *port,
49 const unsigned char *buf, int count);
50static unsigned int ir_write_room(struct tty_struct *tty);
51static void ir_write_bulk_callback(struct urb *urb);
52static void ir_process_read_urb(struct urb *urb);
53static void ir_set_termios(struct tty_struct *tty,
54 struct usb_serial_port *port,
55 const struct ktermios *old_termios);
56
57/* Not that this lot means you can only have one per system */
58static u8 ir_baud;
59static u8 ir_xbof;
60static u8 ir_add_bof;
61
62static const struct usb_device_id ir_id_table[] = {
63 { USB_DEVICE(0x050f, 0x0180) }, /* KC Technology, KC-180 */
64 { USB_DEVICE(0x08e9, 0x0100) }, /* XTNDAccess */
65 { USB_DEVICE(0x09c4, 0x0011) }, /* ACTiSys ACT-IR2000U */
66 { USB_INTERFACE_INFO(USB_CLASS_APP_SPEC, USB_SUBCLASS_IRDA, 0) },
67 { } /* Terminating entry */
68};
69
70MODULE_DEVICE_TABLE(usb, ir_id_table);
71
72static struct usb_serial_driver ir_device = {
73 .driver = {
74 .owner = THIS_MODULE,
75 .name = "ir-usb",
76 },
77 .description = "IR Dongle",
78 .id_table = ir_id_table,
79 .num_ports = 1,
80 .num_bulk_in = 1,
81 .num_bulk_out = 1,
82 .set_termios = ir_set_termios,
83 .attach = ir_startup,
84 .write = ir_write,
85 .write_room = ir_write_room,
86 .write_bulk_callback = ir_write_bulk_callback,
87 .process_read_urb = ir_process_read_urb,
88};
89
90static struct usb_serial_driver * const serial_drivers[] = {
91 &ir_device, NULL
92};
93
94static inline void irda_usb_dump_class_desc(struct usb_serial *serial,
95 struct usb_irda_cs_descriptor *desc)
96{
97 struct device *dev = &serial->dev->dev;
98
99 dev_dbg(dev, "bLength=%x\n", desc->bLength);
100 dev_dbg(dev, "bDescriptorType=%x\n", desc->bDescriptorType);
101 dev_dbg(dev, "bcdSpecRevision=%x\n", __le16_to_cpu(desc->bcdSpecRevision));
102 dev_dbg(dev, "bmDataSize=%x\n", desc->bmDataSize);
103 dev_dbg(dev, "bmWindowSize=%x\n", desc->bmWindowSize);
104 dev_dbg(dev, "bmMinTurnaroundTime=%d\n", desc->bmMinTurnaroundTime);
105 dev_dbg(dev, "wBaudRate=%x\n", __le16_to_cpu(desc->wBaudRate));
106 dev_dbg(dev, "bmAdditionalBOFs=%x\n", desc->bmAdditionalBOFs);
107 dev_dbg(dev, "bIrdaRateSniff=%x\n", desc->bIrdaRateSniff);
108 dev_dbg(dev, "bMaxUnicastList=%x\n", desc->bMaxUnicastList);
109}
110
111/*------------------------------------------------------------------*/
112/*
113 * Function irda_usb_find_class_desc(dev, ifnum)
114 *
115 * Returns instance of IrDA class descriptor, or NULL if not found
116 *
117 * The class descriptor is some extra info that IrDA USB devices will
118 * offer to us, describing their IrDA characteristics. We will use that in
119 * irda_usb_init_qos()
120 *
121 * Based on the same function in drivers/net/irda/irda-usb.c
122 */
123static struct usb_irda_cs_descriptor *
124irda_usb_find_class_desc(struct usb_serial *serial, unsigned int ifnum)
125{
126 struct usb_device *dev = serial->dev;
127 struct usb_irda_cs_descriptor *desc;
128 int ret;
129
130 desc = kzalloc(sizeof(*desc), GFP_KERNEL);
131 if (!desc)
132 return NULL;
133
134 ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
135 USB_REQ_CS_IRDA_GET_CLASS_DESC,
136 USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
137 0, ifnum, desc, sizeof(*desc), 1000);
138
139 dev_dbg(&serial->dev->dev, "%s - ret=%d\n", __func__, ret);
140 if (ret < (int)sizeof(*desc)) {
141 dev_dbg(&serial->dev->dev,
142 "%s - class descriptor read %s (%d)\n", __func__,
143 (ret < 0) ? "failed" : "too short", ret);
144 goto error;
145 }
146 if (desc->bDescriptorType != USB_DT_CS_IRDA) {
147 dev_dbg(&serial->dev->dev, "%s - bad class descriptor type\n",
148 __func__);
149 goto error;
150 }
151
152 irda_usb_dump_class_desc(serial, desc);
153 return desc;
154
155error:
156 kfree(desc);
157 return NULL;
158}
159
160static u8 ir_xbof_change(u8 xbof)
161{
162 u8 result;
163
164 /* reference irda-usb.c */
165 switch (xbof) {
166 case 48:
167 result = 0x10;
168 break;
169 case 28:
170 case 24:
171 result = 0x20;
172 break;
173 default:
174 case 12:
175 result = 0x30;
176 break;
177 case 5:
178 case 6:
179 result = 0x40;
180 break;
181 case 3:
182 result = 0x50;
183 break;
184 case 2:
185 result = 0x60;
186 break;
187 case 1:
188 result = 0x70;
189 break;
190 case 0:
191 result = 0x80;
192 break;
193 }
194
195 return(result);
196}
197
198static int ir_startup(struct usb_serial *serial)
199{
200 struct usb_irda_cs_descriptor *irda_desc;
201 int rates;
202
203 irda_desc = irda_usb_find_class_desc(serial, 0);
204 if (!irda_desc) {
205 dev_err(&serial->dev->dev,
206 "IRDA class descriptor not found, device not bound\n");
207 return -ENODEV;
208 }
209
210 rates = le16_to_cpu(irda_desc->wBaudRate);
211
212 dev_dbg(&serial->dev->dev,
213 "%s - Baud rates supported:%s%s%s%s%s%s%s%s%s\n",
214 __func__,
215 (rates & USB_IRDA_BR_2400) ? " 2400" : "",
216 (rates & USB_IRDA_BR_9600) ? " 9600" : "",
217 (rates & USB_IRDA_BR_19200) ? " 19200" : "",
218 (rates & USB_IRDA_BR_38400) ? " 38400" : "",
219 (rates & USB_IRDA_BR_57600) ? " 57600" : "",
220 (rates & USB_IRDA_BR_115200) ? " 115200" : "",
221 (rates & USB_IRDA_BR_576000) ? " 576000" : "",
222 (rates & USB_IRDA_BR_1152000) ? " 1152000" : "",
223 (rates & USB_IRDA_BR_4000000) ? " 4000000" : "");
224
225 switch (irda_desc->bmAdditionalBOFs) {
226 case USB_IRDA_AB_48:
227 ir_add_bof = 48;
228 break;
229 case USB_IRDA_AB_24:
230 ir_add_bof = 24;
231 break;
232 case USB_IRDA_AB_12:
233 ir_add_bof = 12;
234 break;
235 case USB_IRDA_AB_6:
236 ir_add_bof = 6;
237 break;
238 case USB_IRDA_AB_3:
239 ir_add_bof = 3;
240 break;
241 case USB_IRDA_AB_2:
242 ir_add_bof = 2;
243 break;
244 case USB_IRDA_AB_1:
245 ir_add_bof = 1;
246 break;
247 case USB_IRDA_AB_0:
248 ir_add_bof = 0;
249 break;
250 default:
251 break;
252 }
253
254 kfree(irda_desc);
255
256 return 0;
257}
258
259static int ir_write(struct tty_struct *tty, struct usb_serial_port *port,
260 const unsigned char *buf, int count)
261{
262 struct urb *urb = NULL;
263 unsigned long flags;
264 int ret;
265
266 if (port->bulk_out_size == 0)
267 return -EINVAL;
268
269 if (count == 0)
270 return 0;
271
272 count = min(count, port->bulk_out_size - 1);
273
274 spin_lock_irqsave(&port->lock, flags);
275 if (__test_and_clear_bit(0, &port->write_urbs_free)) {
276 urb = port->write_urbs[0];
277 port->tx_bytes += count;
278 }
279 spin_unlock_irqrestore(&port->lock, flags);
280
281 if (!urb)
282 return 0;
283
284 /*
285 * The first byte of the packet we send to the device contains an
286 * outbound header which indicates an additional number of BOFs and
287 * a baud rate change.
288 *
289 * See section 5.4.2.2 of the USB IrDA spec.
290 */
291 *(u8 *)urb->transfer_buffer = ir_xbof | ir_baud;
292
293 memcpy(urb->transfer_buffer + 1, buf, count);
294
295 urb->transfer_buffer_length = count + 1;
296 urb->transfer_flags = URB_ZERO_PACKET;
297
298 ret = usb_submit_urb(urb, GFP_ATOMIC);
299 if (ret) {
300 dev_err(&port->dev, "failed to submit write urb: %d\n", ret);
301
302 spin_lock_irqsave(&port->lock, flags);
303 __set_bit(0, &port->write_urbs_free);
304 port->tx_bytes -= count;
305 spin_unlock_irqrestore(&port->lock, flags);
306
307 return ret;
308 }
309
310 return count;
311}
312
313static void ir_write_bulk_callback(struct urb *urb)
314{
315 struct usb_serial_port *port = urb->context;
316 int status = urb->status;
317 unsigned long flags;
318
319 spin_lock_irqsave(&port->lock, flags);
320 __set_bit(0, &port->write_urbs_free);
321 port->tx_bytes -= urb->transfer_buffer_length - 1;
322 spin_unlock_irqrestore(&port->lock, flags);
323
324 switch (status) {
325 case 0:
326 break;
327 case -ENOENT:
328 case -ECONNRESET:
329 case -ESHUTDOWN:
330 dev_dbg(&port->dev, "write urb stopped: %d\n", status);
331 return;
332 case -EPIPE:
333 dev_err(&port->dev, "write urb stopped: %d\n", status);
334 return;
335 default:
336 dev_err(&port->dev, "nonzero write-urb status: %d\n", status);
337 break;
338 }
339
340 usb_serial_port_softint(port);
341}
342
343static unsigned int ir_write_room(struct tty_struct *tty)
344{
345 struct usb_serial_port *port = tty->driver_data;
346 unsigned int count = 0;
347
348 if (port->bulk_out_size == 0)
349 return 0;
350
351 if (test_bit(0, &port->write_urbs_free))
352 count = port->bulk_out_size - 1;
353
354 return count;
355}
356
357static void ir_process_read_urb(struct urb *urb)
358{
359 struct usb_serial_port *port = urb->context;
360 unsigned char *data = urb->transfer_buffer;
361
362 if (!urb->actual_length)
363 return;
364 /*
365 * The first byte of the packet we get from the device
366 * contains a busy indicator and baud rate change.
367 * See section 5.4.1.2 of the USB IrDA spec.
368 */
369 if (*data & 0x0f)
370 ir_baud = *data & 0x0f;
371
372 if (urb->actual_length == 1)
373 return;
374
375 tty_insert_flip_string(&port->port, data + 1, urb->actual_length - 1);
376 tty_flip_buffer_push(&port->port);
377}
378
379static void ir_set_termios(struct tty_struct *tty,
380 struct usb_serial_port *port,
381 const struct ktermios *old_termios)
382{
383 struct usb_device *udev = port->serial->dev;
384 unsigned char *transfer_buffer;
385 int actual_length;
386 speed_t baud;
387 int ir_baud;
388 int ret;
389
390 baud = tty_get_baud_rate(tty);
391
392 /*
393 * FIXME, we should compare the baud request against the
394 * capability stated in the IR header that we got in the
395 * startup function.
396 */
397
398 switch (baud) {
399 case 2400:
400 ir_baud = USB_IRDA_LS_2400;
401 break;
402 case 9600:
403 ir_baud = USB_IRDA_LS_9600;
404 break;
405 case 19200:
406 ir_baud = USB_IRDA_LS_19200;
407 break;
408 case 38400:
409 ir_baud = USB_IRDA_LS_38400;
410 break;
411 case 57600:
412 ir_baud = USB_IRDA_LS_57600;
413 break;
414 case 115200:
415 ir_baud = USB_IRDA_LS_115200;
416 break;
417 case 576000:
418 ir_baud = USB_IRDA_LS_576000;
419 break;
420 case 1152000:
421 ir_baud = USB_IRDA_LS_1152000;
422 break;
423 case 4000000:
424 ir_baud = USB_IRDA_LS_4000000;
425 break;
426 default:
427 ir_baud = USB_IRDA_LS_9600;
428 baud = 9600;
429 }
430
431 if (xbof == -1)
432 ir_xbof = ir_xbof_change(ir_add_bof);
433 else
434 ir_xbof = ir_xbof_change(xbof) ;
435
436 /* Only speed changes are supported */
437 tty_termios_copy_hw(&tty->termios, old_termios);
438 tty_encode_baud_rate(tty, baud, baud);
439
440 /*
441 * send the baud change out on an "empty" data packet
442 */
443 transfer_buffer = kmalloc(1, GFP_KERNEL);
444 if (!transfer_buffer)
445 return;
446
447 *transfer_buffer = ir_xbof | ir_baud;
448
449 ret = usb_bulk_msg(udev,
450 usb_sndbulkpipe(udev, port->bulk_out_endpointAddress),
451 transfer_buffer, 1, &actual_length, 5000);
452 if (ret || actual_length != 1) {
453 if (!ret)
454 ret = -EIO;
455 dev_err(&port->dev, "failed to change line speed: %d\n", ret);
456 }
457
458 kfree(transfer_buffer);
459}
460
461static int __init ir_init(void)
462{
463 if (buffer_size) {
464 ir_device.bulk_in_size = buffer_size;
465 ir_device.bulk_out_size = buffer_size;
466 }
467
468 return usb_serial_register_drivers(serial_drivers, KBUILD_MODNAME, ir_id_table);
469}
470
471static void __exit ir_exit(void)
472{
473 usb_serial_deregister_drivers(serial_drivers);
474}
475
476
477module_init(ir_init);
478module_exit(ir_exit);
479
480MODULE_AUTHOR(DRIVER_AUTHOR);
481MODULE_DESCRIPTION(DRIVER_DESC);
482MODULE_LICENSE("GPL");
483
484module_param(xbof, int, 0);
485MODULE_PARM_DESC(xbof, "Force specific number of XBOFs");
486module_param(buffer_size, int, 0);
487MODULE_PARM_DESC(buffer_size, "Size of the transfer buffers");
488
1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * USB IR Dongle driver
4 *
5 * Copyright (C) 2001-2002 Greg Kroah-Hartman (greg@kroah.com)
6 * Copyright (C) 2002 Gary Brubaker (xavyer@ix.netcom.com)
7 * Copyright (C) 2010 Johan Hovold (jhovold@gmail.com)
8 *
9 * This driver allows a USB IrDA device to be used as a "dumb" serial device.
10 * This can be useful if you do not have access to a full IrDA stack on the
11 * other side of the connection. If you do have an IrDA stack on both devices,
12 * please use the usb-irda driver, as it contains the proper error checking and
13 * other goodness of a full IrDA stack.
14 *
15 * Portions of this driver were taken from drivers/net/irda/irda-usb.c, which
16 * was written by Roman Weissgaerber <weissg@vienna.at>, Dag Brattli
17 * <dag@brattli.net>, and Jean Tourrilhes <jt@hpl.hp.com>
18 *
19 * See Documentation/usb/usb-serial.rst for more information on using this
20 * driver
21 */
22
23#include <linux/kernel.h>
24#include <linux/errno.h>
25#include <linux/init.h>
26#include <linux/slab.h>
27#include <linux/tty.h>
28#include <linux/tty_driver.h>
29#include <linux/tty_flip.h>
30#include <linux/module.h>
31#include <linux/spinlock.h>
32#include <linux/uaccess.h>
33#include <linux/usb.h>
34#include <linux/usb/serial.h>
35#include <linux/usb/irda.h>
36
37#define DRIVER_AUTHOR "Greg Kroah-Hartman <greg@kroah.com>, Johan Hovold <jhovold@gmail.com>"
38#define DRIVER_DESC "USB IR Dongle driver"
39
40/* if overridden by the user, then use their value for the size of the read and
41 * write urbs */
42static int buffer_size;
43
44/* if overridden by the user, then use the specified number of XBOFs */
45static int xbof = -1;
46
47static int ir_startup (struct usb_serial *serial);
48static int ir_write(struct tty_struct *tty, struct usb_serial_port *port,
49 const unsigned char *buf, int count);
50static unsigned int ir_write_room(struct tty_struct *tty);
51static void ir_write_bulk_callback(struct urb *urb);
52static void ir_process_read_urb(struct urb *urb);
53static void ir_set_termios(struct tty_struct *tty,
54 struct usb_serial_port *port, struct ktermios *old_termios);
55
56/* Not that this lot means you can only have one per system */
57static u8 ir_baud;
58static u8 ir_xbof;
59static u8 ir_add_bof;
60
61static const struct usb_device_id ir_id_table[] = {
62 { USB_DEVICE(0x050f, 0x0180) }, /* KC Technology, KC-180 */
63 { USB_DEVICE(0x08e9, 0x0100) }, /* XTNDAccess */
64 { USB_DEVICE(0x09c4, 0x0011) }, /* ACTiSys ACT-IR2000U */
65 { USB_INTERFACE_INFO(USB_CLASS_APP_SPEC, USB_SUBCLASS_IRDA, 0) },
66 { } /* Terminating entry */
67};
68
69MODULE_DEVICE_TABLE(usb, ir_id_table);
70
71static struct usb_serial_driver ir_device = {
72 .driver = {
73 .owner = THIS_MODULE,
74 .name = "ir-usb",
75 },
76 .description = "IR Dongle",
77 .id_table = ir_id_table,
78 .num_ports = 1,
79 .num_bulk_in = 1,
80 .num_bulk_out = 1,
81 .set_termios = ir_set_termios,
82 .attach = ir_startup,
83 .write = ir_write,
84 .write_room = ir_write_room,
85 .write_bulk_callback = ir_write_bulk_callback,
86 .process_read_urb = ir_process_read_urb,
87};
88
89static struct usb_serial_driver * const serial_drivers[] = {
90 &ir_device, NULL
91};
92
93static inline void irda_usb_dump_class_desc(struct usb_serial *serial,
94 struct usb_irda_cs_descriptor *desc)
95{
96 struct device *dev = &serial->dev->dev;
97
98 dev_dbg(dev, "bLength=%x\n", desc->bLength);
99 dev_dbg(dev, "bDescriptorType=%x\n", desc->bDescriptorType);
100 dev_dbg(dev, "bcdSpecRevision=%x\n", __le16_to_cpu(desc->bcdSpecRevision));
101 dev_dbg(dev, "bmDataSize=%x\n", desc->bmDataSize);
102 dev_dbg(dev, "bmWindowSize=%x\n", desc->bmWindowSize);
103 dev_dbg(dev, "bmMinTurnaroundTime=%d\n", desc->bmMinTurnaroundTime);
104 dev_dbg(dev, "wBaudRate=%x\n", __le16_to_cpu(desc->wBaudRate));
105 dev_dbg(dev, "bmAdditionalBOFs=%x\n", desc->bmAdditionalBOFs);
106 dev_dbg(dev, "bIrdaRateSniff=%x\n", desc->bIrdaRateSniff);
107 dev_dbg(dev, "bMaxUnicastList=%x\n", desc->bMaxUnicastList);
108}
109
110/*------------------------------------------------------------------*/
111/*
112 * Function irda_usb_find_class_desc(dev, ifnum)
113 *
114 * Returns instance of IrDA class descriptor, or NULL if not found
115 *
116 * The class descriptor is some extra info that IrDA USB devices will
117 * offer to us, describing their IrDA characteristics. We will use that in
118 * irda_usb_init_qos()
119 *
120 * Based on the same function in drivers/net/irda/irda-usb.c
121 */
122static struct usb_irda_cs_descriptor *
123irda_usb_find_class_desc(struct usb_serial *serial, unsigned int ifnum)
124{
125 struct usb_device *dev = serial->dev;
126 struct usb_irda_cs_descriptor *desc;
127 int ret;
128
129 desc = kzalloc(sizeof(*desc), GFP_KERNEL);
130 if (!desc)
131 return NULL;
132
133 ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
134 USB_REQ_CS_IRDA_GET_CLASS_DESC,
135 USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
136 0, ifnum, desc, sizeof(*desc), 1000);
137
138 dev_dbg(&serial->dev->dev, "%s - ret=%d\n", __func__, ret);
139 if (ret < (int)sizeof(*desc)) {
140 dev_dbg(&serial->dev->dev,
141 "%s - class descriptor read %s (%d)\n", __func__,
142 (ret < 0) ? "failed" : "too short", ret);
143 goto error;
144 }
145 if (desc->bDescriptorType != USB_DT_CS_IRDA) {
146 dev_dbg(&serial->dev->dev, "%s - bad class descriptor type\n",
147 __func__);
148 goto error;
149 }
150
151 irda_usb_dump_class_desc(serial, desc);
152 return desc;
153
154error:
155 kfree(desc);
156 return NULL;
157}
158
159static u8 ir_xbof_change(u8 xbof)
160{
161 u8 result;
162
163 /* reference irda-usb.c */
164 switch (xbof) {
165 case 48:
166 result = 0x10;
167 break;
168 case 28:
169 case 24:
170 result = 0x20;
171 break;
172 default:
173 case 12:
174 result = 0x30;
175 break;
176 case 5:
177 case 6:
178 result = 0x40;
179 break;
180 case 3:
181 result = 0x50;
182 break;
183 case 2:
184 result = 0x60;
185 break;
186 case 1:
187 result = 0x70;
188 break;
189 case 0:
190 result = 0x80;
191 break;
192 }
193
194 return(result);
195}
196
197static int ir_startup(struct usb_serial *serial)
198{
199 struct usb_irda_cs_descriptor *irda_desc;
200 int rates;
201
202 irda_desc = irda_usb_find_class_desc(serial, 0);
203 if (!irda_desc) {
204 dev_err(&serial->dev->dev,
205 "IRDA class descriptor not found, device not bound\n");
206 return -ENODEV;
207 }
208
209 rates = le16_to_cpu(irda_desc->wBaudRate);
210
211 dev_dbg(&serial->dev->dev,
212 "%s - Baud rates supported:%s%s%s%s%s%s%s%s%s\n",
213 __func__,
214 (rates & USB_IRDA_BR_2400) ? " 2400" : "",
215 (rates & USB_IRDA_BR_9600) ? " 9600" : "",
216 (rates & USB_IRDA_BR_19200) ? " 19200" : "",
217 (rates & USB_IRDA_BR_38400) ? " 38400" : "",
218 (rates & USB_IRDA_BR_57600) ? " 57600" : "",
219 (rates & USB_IRDA_BR_115200) ? " 115200" : "",
220 (rates & USB_IRDA_BR_576000) ? " 576000" : "",
221 (rates & USB_IRDA_BR_1152000) ? " 1152000" : "",
222 (rates & USB_IRDA_BR_4000000) ? " 4000000" : "");
223
224 switch (irda_desc->bmAdditionalBOFs) {
225 case USB_IRDA_AB_48:
226 ir_add_bof = 48;
227 break;
228 case USB_IRDA_AB_24:
229 ir_add_bof = 24;
230 break;
231 case USB_IRDA_AB_12:
232 ir_add_bof = 12;
233 break;
234 case USB_IRDA_AB_6:
235 ir_add_bof = 6;
236 break;
237 case USB_IRDA_AB_3:
238 ir_add_bof = 3;
239 break;
240 case USB_IRDA_AB_2:
241 ir_add_bof = 2;
242 break;
243 case USB_IRDA_AB_1:
244 ir_add_bof = 1;
245 break;
246 case USB_IRDA_AB_0:
247 ir_add_bof = 0;
248 break;
249 default:
250 break;
251 }
252
253 kfree(irda_desc);
254
255 return 0;
256}
257
258static int ir_write(struct tty_struct *tty, struct usb_serial_port *port,
259 const unsigned char *buf, int count)
260{
261 struct urb *urb = NULL;
262 unsigned long flags;
263 int ret;
264
265 if (port->bulk_out_size == 0)
266 return -EINVAL;
267
268 if (count == 0)
269 return 0;
270
271 count = min(count, port->bulk_out_size - 1);
272
273 spin_lock_irqsave(&port->lock, flags);
274 if (__test_and_clear_bit(0, &port->write_urbs_free)) {
275 urb = port->write_urbs[0];
276 port->tx_bytes += count;
277 }
278 spin_unlock_irqrestore(&port->lock, flags);
279
280 if (!urb)
281 return 0;
282
283 /*
284 * The first byte of the packet we send to the device contains an
285 * outbound header which indicates an additional number of BOFs and
286 * a baud rate change.
287 *
288 * See section 5.4.2.2 of the USB IrDA spec.
289 */
290 *(u8 *)urb->transfer_buffer = ir_xbof | ir_baud;
291
292 memcpy(urb->transfer_buffer + 1, buf, count);
293
294 urb->transfer_buffer_length = count + 1;
295 urb->transfer_flags = URB_ZERO_PACKET;
296
297 ret = usb_submit_urb(urb, GFP_ATOMIC);
298 if (ret) {
299 dev_err(&port->dev, "failed to submit write urb: %d\n", ret);
300
301 spin_lock_irqsave(&port->lock, flags);
302 __set_bit(0, &port->write_urbs_free);
303 port->tx_bytes -= count;
304 spin_unlock_irqrestore(&port->lock, flags);
305
306 return ret;
307 }
308
309 return count;
310}
311
312static void ir_write_bulk_callback(struct urb *urb)
313{
314 struct usb_serial_port *port = urb->context;
315 int status = urb->status;
316 unsigned long flags;
317
318 spin_lock_irqsave(&port->lock, flags);
319 __set_bit(0, &port->write_urbs_free);
320 port->tx_bytes -= urb->transfer_buffer_length - 1;
321 spin_unlock_irqrestore(&port->lock, flags);
322
323 switch (status) {
324 case 0:
325 break;
326 case -ENOENT:
327 case -ECONNRESET:
328 case -ESHUTDOWN:
329 dev_dbg(&port->dev, "write urb stopped: %d\n", status);
330 return;
331 case -EPIPE:
332 dev_err(&port->dev, "write urb stopped: %d\n", status);
333 return;
334 default:
335 dev_err(&port->dev, "nonzero write-urb status: %d\n", status);
336 break;
337 }
338
339 usb_serial_port_softint(port);
340}
341
342static unsigned int ir_write_room(struct tty_struct *tty)
343{
344 struct usb_serial_port *port = tty->driver_data;
345 unsigned int count = 0;
346
347 if (port->bulk_out_size == 0)
348 return 0;
349
350 if (test_bit(0, &port->write_urbs_free))
351 count = port->bulk_out_size - 1;
352
353 return count;
354}
355
356static void ir_process_read_urb(struct urb *urb)
357{
358 struct usb_serial_port *port = urb->context;
359 unsigned char *data = urb->transfer_buffer;
360
361 if (!urb->actual_length)
362 return;
363 /*
364 * The first byte of the packet we get from the device
365 * contains a busy indicator and baud rate change.
366 * See section 5.4.1.2 of the USB IrDA spec.
367 */
368 if (*data & 0x0f)
369 ir_baud = *data & 0x0f;
370
371 if (urb->actual_length == 1)
372 return;
373
374 tty_insert_flip_string(&port->port, data + 1, urb->actual_length - 1);
375 tty_flip_buffer_push(&port->port);
376}
377
378static void ir_set_termios(struct tty_struct *tty,
379 struct usb_serial_port *port, struct ktermios *old_termios)
380{
381 struct usb_device *udev = port->serial->dev;
382 unsigned char *transfer_buffer;
383 int actual_length;
384 speed_t baud;
385 int ir_baud;
386 int ret;
387
388 baud = tty_get_baud_rate(tty);
389
390 /*
391 * FIXME, we should compare the baud request against the
392 * capability stated in the IR header that we got in the
393 * startup function.
394 */
395
396 switch (baud) {
397 case 2400:
398 ir_baud = USB_IRDA_LS_2400;
399 break;
400 case 9600:
401 ir_baud = USB_IRDA_LS_9600;
402 break;
403 case 19200:
404 ir_baud = USB_IRDA_LS_19200;
405 break;
406 case 38400:
407 ir_baud = USB_IRDA_LS_38400;
408 break;
409 case 57600:
410 ir_baud = USB_IRDA_LS_57600;
411 break;
412 case 115200:
413 ir_baud = USB_IRDA_LS_115200;
414 break;
415 case 576000:
416 ir_baud = USB_IRDA_LS_576000;
417 break;
418 case 1152000:
419 ir_baud = USB_IRDA_LS_1152000;
420 break;
421 case 4000000:
422 ir_baud = USB_IRDA_LS_4000000;
423 break;
424 default:
425 ir_baud = USB_IRDA_LS_9600;
426 baud = 9600;
427 }
428
429 if (xbof == -1)
430 ir_xbof = ir_xbof_change(ir_add_bof);
431 else
432 ir_xbof = ir_xbof_change(xbof) ;
433
434 /* Only speed changes are supported */
435 tty_termios_copy_hw(&tty->termios, old_termios);
436 tty_encode_baud_rate(tty, baud, baud);
437
438 /*
439 * send the baud change out on an "empty" data packet
440 */
441 transfer_buffer = kmalloc(1, GFP_KERNEL);
442 if (!transfer_buffer)
443 return;
444
445 *transfer_buffer = ir_xbof | ir_baud;
446
447 ret = usb_bulk_msg(udev,
448 usb_sndbulkpipe(udev, port->bulk_out_endpointAddress),
449 transfer_buffer, 1, &actual_length, 5000);
450 if (ret || actual_length != 1) {
451 if (!ret)
452 ret = -EIO;
453 dev_err(&port->dev, "failed to change line speed: %d\n", ret);
454 }
455
456 kfree(transfer_buffer);
457}
458
459static int __init ir_init(void)
460{
461 if (buffer_size) {
462 ir_device.bulk_in_size = buffer_size;
463 ir_device.bulk_out_size = buffer_size;
464 }
465
466 return usb_serial_register_drivers(serial_drivers, KBUILD_MODNAME, ir_id_table);
467}
468
469static void __exit ir_exit(void)
470{
471 usb_serial_deregister_drivers(serial_drivers);
472}
473
474
475module_init(ir_init);
476module_exit(ir_exit);
477
478MODULE_AUTHOR(DRIVER_AUTHOR);
479MODULE_DESCRIPTION(DRIVER_DESC);
480MODULE_LICENSE("GPL");
481
482module_param(xbof, int, 0);
483MODULE_PARM_DESC(xbof, "Force specific number of XBOFs");
484module_param(buffer_size, int, 0);
485MODULE_PARM_DESC(buffer_size, "Size of the transfer buffers");
486