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[mirror_ubuntu-focal-kernel.git] / drivers / net / irda / mcs7780.c
CommitLineData
c6ae522e
SO		 1/*****************************************************************************
2*
3* Filename: mcs7780.c
4* Version: 0.4-alpha
5* Description: Irda MosChip USB Dongle Driver
6* Authors: Lukasz Stelmach <stlman@poczta.fm>
7* Brian Pugh <bpugh@cs.pdx.edu>
8* Judy Fischbach <jfisch@cs.pdx.edu>
9*
10* Based on stir4200 driver, but some things done differently.
11* Based on earlier driver by Paul Stewart <stewart@parc.com>
12*
13* Copyright (C) 2000, Roman Weissgaerber <weissg@vienna.at>
14* Copyright (C) 2001, Dag Brattli <dag@brattli.net>
15* Copyright (C) 2001, Jean Tourrilhes <jt@hpl.hp.com>
16* Copyright (C) 2004, Stephen Hemminger <shemminger@osdl.org>
17* Copyright (C) 2005, Lukasz Stelmach <stlman@poczta.fm>
18* Copyright (C) 2005, Brian Pugh <bpugh@cs.pdx.edu>
19* Copyright (C) 2005, Judy Fischbach <jfisch@cs.pdx.edu>
20*
21* This program is free software; you can redistribute it and/or modify
22* it under the terms of the GNU General Public License as published by
23* the Free Software Foundation; either version 2 of the License, or
24* (at your option) any later version.
25*
26* This program is distributed in the hope that it will be useful,
27* but WITHOUT ANY WARRANTY; without even the implied warranty of
28* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
29* GNU General Public License for more details.
30*
31* You should have received a copy of the GNU General Public License
32* along with this program; if not, write to the Free Software
33* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
34*
35*****************************************************************************/
36
37/*
38 * MCS7780 is a simple USB to IrDA bridge by MosChip. It is neither
39 * compatibile with irda-usb nor with stir4200. Although it is quite
40 * similar to the later as far as general idea of operation is concerned.
41 * That is it requires the software to do all the framing job at SIR speeds.
42 * The hardware does take care of the framing at MIR and FIR speeds.
43 * It supports all speeds from 2400 through 4Mbps
44 */
45
46#include <linux/module.h>
47#include <linux/moduleparam.h>
c6ae522e
SO		 48#include <linux/kernel.h>
49#include <linux/types.h>
50#include <linux/errno.h>
c6ae522e 51#include <linux/slab.h>
c6ae522e
SO		 52#include <linux/usb.h>
53#include <linux/device.h>
54#include <linux/crc32.h>
55
56#include <asm/unaligned.h>
57#include <asm/byteorder.h>
7c0f6ba6 58#include <linux/uaccess.h>
c6ae522e
SO		 59
60#include <net/irda/irda.h>
61#include <net/irda/wrapper.h>
62#include <net/irda/crc.h>
63
64#include "mcs7780.h"
65
66#define MCS_VENDOR_ID 0x9710
67#define MCS_PRODUCT_ID 0x7780
68
69static struct usb_device_id mcs_table[] = {
70 /* MosChip Corp., MCS7780 FIR-USB Adapter */
71 {USB_DEVICE(MCS_VENDOR_ID, MCS_PRODUCT_ID)},
72 {},
73};
74
75MODULE_AUTHOR("Brian Pugh <bpugh@cs.pdx.edu>");
76MODULE_DESCRIPTION("IrDA-USB Dongle Driver for MosChip MCS7780");
77MODULE_VERSION("0.3alpha");
78MODULE_LICENSE("GPL");
79
80MODULE_DEVICE_TABLE(usb, mcs_table);
81
82static int qos_mtt_bits = 0x07 /* > 1ms */ ;
83module_param(qos_mtt_bits, int, 0);
84MODULE_PARM_DESC(qos_mtt_bits, "Minimum Turn Time");
85
86static int receive_mode = 0x1;
87module_param(receive_mode, int, 0);
88MODULE_PARM_DESC(receive_mode,
89 "Receive mode of the device (1:fast, 0:slow, default:1)");
90
91static int sir_tweak = 1;
92module_param(sir_tweak, int, 0444);
93MODULE_PARM_DESC(sir_tweak,
94 "Default pulse width (1:1.6us, 0:3/16 bit, default:1).");
95
96static int transceiver_type = MCS_TSC_VISHAY;
97module_param(transceiver_type, int, 0444);
98MODULE_PARM_DESC(transceiver_type, "IR transceiver type, see mcs7780.h.");
99
7263ade1 100static struct usb_driver mcs_driver = {
c6ae522e
SO		 101 .name = "mcs7780",
102 .probe = mcs_probe,
103 .disconnect = mcs_disconnect,
104 .id_table = mcs_table,
105};
106
107/* speed flag selection by direct addressing.
108addr = (speed >> 8) & 0x0f
109
1100x1 57600 0x2 115200 0x4 1152000 0x5 9600
1110x6 38400 0x9 2400 0xa 576000 0xb 19200
112
1134Mbps (or 2400) must be checked separately. Since it also has
114to be programmed in a different manner that is not a big problem.
115*/
116static __u16 mcs_speed_set[16] = { 0,
117 MCS_SPEED_57600,
118 MCS_SPEED_115200,
119 0,
120 MCS_SPEED_1152000,
121 MCS_SPEED_9600,
122 MCS_SPEED_38400,
123 0, 0,
124 MCS_SPEED_2400,
125 MCS_SPEED_576000,
126 MCS_SPEED_19200,
127 0, 0, 0,
128};
129
130/* Set given 16 bit register with a 16 bit value. Send control message
131 * to set dongle register. */
132static int mcs_set_reg(struct mcs_cb *mcs, __u16 reg, __u16 val)
133{
134 struct usb_device *dev = mcs->usbdev;
135 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ,
136 MCS_WR_RTYPE, val, reg, NULL, 0,
137 msecs_to_jiffies(MCS_CTRL_TIMEOUT));
138}
139
140/* Get 16 bit register value. Send contol message to read dongle register. */
141static int mcs_get_reg(struct mcs_cb *mcs, __u16 reg, __u16 * val)
142{
143 struct usb_device *dev = mcs->usbdev;
144 int ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ,
145 MCS_RD_RTYPE, 0, reg, val, 2,
146 msecs_to_jiffies(MCS_CTRL_TIMEOUT));
147
148 return ret;
149}
150
151/* Setup a communication between mcs7780 and TFDU chips. It is described
152 * in more detail in the data sheet. The setup sequence puts the the
153 * vishay tranceiver into high speed mode. It will also receive SIR speed
154 * packets but at reduced sensitivity.
155 */
156
157/* 0: OK 1:ERROR */
158static inline int mcs_setup_transceiver_vishay(struct mcs_cb *mcs)
159{
160 int ret = 0;
161 __u16 rval;
162
163 /* mcs_get_reg should read exactly two bytes from the dongle */
164 ret = mcs_get_reg(mcs, MCS_XCVR_REG, &rval);
165 if (unlikely(ret != 2)) {
166 ret = -EIO;
167 goto error;
168 }
169
170 /* The MCS_XCVR_CONF bit puts the transceiver into configuration
171 * mode. The MCS_MODE0 bit must start out high (1) and then
172 * transition to low and the MCS_STFIR and MCS_MODE1 bits must
173 * be low.
174 */
175 rval |= (MCS_MODE0 | MCS_XCVR_CONF);
176 rval &= ~MCS_STFIR;
177 rval &= ~MCS_MODE1;
178 ret = mcs_set_reg(mcs, MCS_XCVR_REG, rval);
179 if (unlikely(ret))
180 goto error;
181
182 rval &= ~MCS_MODE0;
183 ret = mcs_set_reg(mcs, MCS_XCVR_REG, rval);
184 if (unlikely(ret))
185 goto error;
186
187 rval &= ~MCS_XCVR_CONF;
188 ret = mcs_set_reg(mcs, MCS_XCVR_REG, rval);
189 if (unlikely(ret))
190 goto error;
191
192 ret = 0;
89473129
AK		 193error:
194 return ret;
c6ae522e
SO		 195}
196
197/* Setup a communication between mcs7780 and agilent chip. */
198static inline int mcs_setup_transceiver_agilent(struct mcs_cb *mcs)
199{
6c91023d 200 net_warn_ratelimited("This transceiver type is not supported yet\n");
c6ae522e
SO		 201 return 1;
202}
203
204/* Setup a communication between mcs7780 and sharp chip. */
205static inline int mcs_setup_transceiver_sharp(struct mcs_cb *mcs)
206{
6c91023d 207 net_warn_ratelimited("This transceiver type is not supported yet\n");
c6ae522e
SO		 208 return 1;
209}
210
211/* Common setup for all transceivers */
212static inline int mcs_setup_transceiver(struct mcs_cb *mcs)
213{
214 int ret = 0;
215 __u16 rval;
6c91023d 216 const char *msg;
c6ae522e 217
6c91023d 218 msg = "Basic transceiver setup error";
c6ae522e
SO		 219
220 /* read value of MODE Register, set the DRIVER and RESET bits
221 * and write value back out to MODE Register
222 */
223 ret = mcs_get_reg(mcs, MCS_MODE_REG, &rval);
224 if(unlikely(ret != 2))
225 goto error;
226 rval |= MCS_DRIVER; /* put the mcs7780 into configuration mode. */
227 ret = mcs_set_reg(mcs, MCS_MODE_REG, rval);
228 if(unlikely(ret))
229 goto error;
230
231 rval = 0; /* set min pulse width to 0 initially. */
232 ret = mcs_set_reg(mcs, MCS_MINRXPW_REG, rval);
233 if(unlikely(ret))
234 goto error;
235
236 ret = mcs_get_reg(mcs, MCS_MODE_REG, &rval);
237 if(unlikely(ret != 2))
238 goto error;
239
240 rval &= ~MCS_FIR; /* turn off fir mode. */
241 if(mcs->sir_tweak)
242 rval |= MCS_SIR16US; /* 1.6us pulse width */
243 else
244 rval &= ~MCS_SIR16US; /* 3/16 bit time pulse width */
245
246 /* make sure ask mode and back to back packets are off. */
247 rval &= ~(MCS_BBTG | MCS_ASK);
248
249 rval &= ~MCS_SPEED_MASK;
250 rval |= MCS_SPEED_9600; /* make sure initial speed is 9600. */
251 mcs->speed = 9600;
252 mcs->new_speed = 0; /* new_speed is set to 0 */
253 rval &= ~MCS_PLLPWDN; /* disable power down. */
254
255 /* make sure device determines direction and that the auto send sip
256 * pulse are on.
257 */
258 rval |= MCS_DTD | MCS_SIPEN;
259
260 ret = mcs_set_reg(mcs, MCS_MODE_REG, rval);
261 if(unlikely(ret))
262 goto error;
263
6c91023d 264 msg = "transceiver model specific setup error";
c6ae522e
SO		 265 switch (mcs->transceiver_type) {
266 case MCS_TSC_VISHAY:
267 ret = mcs_setup_transceiver_vishay(mcs);
268 break;
269
270 case MCS_TSC_SHARP:
271 ret = mcs_setup_transceiver_sharp(mcs);
272 break;
273
274 case MCS_TSC_AGILENT:
275 ret = mcs_setup_transceiver_agilent(mcs);
276 break;
277
278 default:
6c91023d
JP		 279 net_warn_ratelimited("Unknown transceiver type: %d\n",
280 mcs->transceiver_type);
c6ae522e
SO		 281 ret = 1;
282 }
283 if (unlikely(ret))
284 goto error;
285
286 /* If transceiver is not SHARP, then if receive mode set
287 * on the RXFAST bit in the XCVR Register otherwise unset it
288 */
289 if (mcs->transceiver_type != MCS_TSC_SHARP) {
290
291 ret = mcs_get_reg(mcs, MCS_XCVR_REG, &rval);
292 if (unlikely(ret != 2))
293 goto error;
294 if (mcs->receive_mode)
295 rval |= MCS_RXFAST;
296 else
297 rval &= ~MCS_RXFAST;
298 ret = mcs_set_reg(mcs, MCS_XCVR_REG, rval);
299 if (unlikely(ret))
300 goto error;
301 }
302
6c91023d 303 msg = "transceiver reset";
c6ae522e
SO		 304
305 ret = mcs_get_reg(mcs, MCS_MODE_REG, &rval);
306 if (unlikely(ret != 2))
307 goto error;
308
309 /* reset the mcs7780 so all changes take effect. */
310 rval &= ~MCS_RESET;
311 ret = mcs_set_reg(mcs, MCS_MODE_REG, rval);
312 if (unlikely(ret))
313 goto error;
314 else
315 return ret;
316
317error:
6c91023d 318 net_err_ratelimited("%s\n", msg);
c6ae522e
SO		 319 return ret;
320}
321
322/* Wraps the data in format for SIR */
323static inline int mcs_wrap_sir_skb(struct sk_buff *skb, __u8 * buf)
324{
325 int wraplen;
326
327 /* 2: full frame length, including "the length" */
328 wraplen = async_wrap_skb(skb, buf + 2, 4094);
329
330 wraplen += 2;
331 buf[0] = wraplen & 0xff;
332 buf[1] = (wraplen >> 8) & 0xff;
333
334 return wraplen;
335}
336
337/* Wraps the data in format for FIR */
338static unsigned mcs_wrap_fir_skb(const struct sk_buff *skb, __u8 *buf)
339{
340 unsigned int len = 0;
341 __u32 fcs = ~(crc32_le(~0, skb->data, skb->len));
342
343 /* add 2 bytes for length value and 4 bytes for fcs. */
344 len = skb->len + 6;
345
346 /* The mcs7780 requires that the first two bytes are the packet
347 * length in little endian order. Note: the length value includes
348 * the two bytes for the length value itself.
349 */
350 buf[0] = len & 0xff;
351 buf[1] = (len >> 8) & 0xff;
352 /* copy the data into the tx buffer. */
d626f62b 353 skb_copy_from_linear_data(skb, buf + 2, skb->len);
c6ae522e
SO		 354 /* put the fcs in the last four bytes in little endian order. */
355 buf[len - 4] = fcs & 0xff;
356 buf[len - 3] = (fcs >> 8) & 0xff;
357 buf[len - 2] = (fcs >> 16) & 0xff;
358 buf[len - 1] = (fcs >> 24) & 0xff;
359
360 return len;
361}
362
363/* Wraps the data in format for MIR */
364static unsigned mcs_wrap_mir_skb(const struct sk_buff *skb, __u8 *buf)
365{
366 __u16 fcs = 0;
367 int len = skb->len + 4;
368
369 fcs = ~(irda_calc_crc16(~fcs, skb->data, skb->len));
370 /* put the total packet length in first. Note: packet length
371 * value includes the two bytes that hold the packet length
372 * itself.
373 */
374 buf[0] = len & 0xff;
375 buf[1] = (len >> 8) & 0xff;
376 /* copy the data */
d626f62b 377 skb_copy_from_linear_data(skb, buf + 2, skb->len);
c6ae522e
SO		 378 /* put the fcs in last two bytes in little endian order. */
379 buf[len - 2] = fcs & 0xff;
380 buf[len - 1] = (fcs >> 8) & 0xff;
381
382 return len;
383}
384
385/* Unwrap received packets at MIR speed. A 16 bit crc_ccitt checksum is
386 * used for the fcs. When performed over the entire packet the result
387 * should be GOOD_FCS = 0xf0b8. Hands the unwrapped data off to the IrDA
388 * layer via a sk_buff.
389 */
390static void mcs_unwrap_mir(struct mcs_cb *mcs, __u8 *buf, int len)
391{
392 __u16 fcs;
393 int new_len;
394 struct sk_buff *skb;
395
396 /* Assume that the frames are going to fill a single packet
397 * rather than span multiple packets.
398 */
399
400 new_len = len - 2;
401 if(unlikely(new_len <= 0)) {
6c91023d
JP		 402 net_err_ratelimited("%s short frame length %d\n",
403 mcs->netdev->name, new_len);
af049081
SH		 404 ++mcs->netdev->stats.rx_errors;
405 ++mcs->netdev->stats.rx_length_errors;
c6ae522e
SO		 406 return;
407 }
408 fcs = 0;
409 fcs = irda_calc_crc16(~fcs, buf, len);
410
411 if(fcs != GOOD_FCS) {
6c91023d
JP		 412 net_err_ratelimited("crc error calc 0x%x len %d\n",
413 fcs, new_len);
af049081
SH		 414 mcs->netdev->stats.rx_errors++;
415 mcs->netdev->stats.rx_crc_errors++;
c6ae522e
SO		 416 return;
417 }
418
419 skb = dev_alloc_skb(new_len + 1);
420 if(unlikely(!skb)) {
af049081 421 ++mcs->netdev->stats.rx_dropped;
c6ae522e
SO		 422 return;
423 }
424
425 skb_reserve(skb, 1);
27d7ff46 426 skb_copy_to_linear_data(skb, buf, new_len);
c6ae522e 427 skb_put(skb, new_len);
459a98ed 428 skb_reset_mac_header(skb);
c6ae522e
SO		 429 skb->protocol = htons(ETH_P_IRDA);
430 skb->dev = mcs->netdev;
431
432 netif_rx(skb);
433
af049081
SH		 434 mcs->netdev->stats.rx_packets++;
435 mcs->netdev->stats.rx_bytes += new_len;
c6ae522e
SO		 436}
437
438/* Unwrap received packets at FIR speed. A 32 bit crc_ccitt checksum is
439 * used for the fcs. Hands the unwrapped data off to the IrDA
440 * layer via a sk_buff.
441 */
442static void mcs_unwrap_fir(struct mcs_cb *mcs, __u8 *buf, int len)
443{
444 __u32 fcs;
445 int new_len;
446 struct sk_buff *skb;
447
448 /* Assume that the frames are going to fill a single packet
449 * rather than span multiple packets. This is most likely a false
450 * assumption.
451 */
452
453 new_len = len - 4;
454 if(unlikely(new_len <= 0)) {
6c91023d
JP		 455 net_err_ratelimited("%s short frame length %d\n",
456 mcs->netdev->name, new_len);
af049081
SH		 457 ++mcs->netdev->stats.rx_errors;
458 ++mcs->netdev->stats.rx_length_errors;
c6ae522e
SO		 459 return;
460 }
461
462 fcs = ~(crc32_le(~0, buf, new_len));
6caf52a4 463 if(fcs != get_unaligned_le32(buf + new_len)) {
6c91023d
JP		 464 net_err_ratelimited("crc error calc 0x%x len %d\n",
465 fcs, new_len);
af049081
SH		 466 mcs->netdev->stats.rx_errors++;
467 mcs->netdev->stats.rx_crc_errors++;
c6ae522e
SO		 468 return;
469 }
470
471 skb = dev_alloc_skb(new_len + 1);
472 if(unlikely(!skb)) {
af049081 473 ++mcs->netdev->stats.rx_dropped;
c6ae522e
SO		 474 return;
475 }
476
477 skb_reserve(skb, 1);
27d7ff46 478 skb_copy_to_linear_data(skb, buf, new_len);
c6ae522e 479 skb_put(skb, new_len);
459a98ed 480 skb_reset_mac_header(skb);
c6ae522e
SO		 481 skb->protocol = htons(ETH_P_IRDA);
482 skb->dev = mcs->netdev;
483
484 netif_rx(skb);
485
af049081
SH		 486 mcs->netdev->stats.rx_packets++;
487 mcs->netdev->stats.rx_bytes += new_len;
c6ae522e
SO		 488}
489
490
491/* Allocates urbs for both receive and transmit.
492 * If alloc fails return error code 0 (fail) otherwise
493 * return error code 1 (success).
494 */
495static inline int mcs_setup_urbs(struct mcs_cb *mcs)
496{
497 mcs->rx_urb = NULL;
498
499 mcs->tx_urb = usb_alloc_urb(0, GFP_KERNEL);
500 if (!mcs->tx_urb)
501 return 0;
502
503 mcs->rx_urb = usb_alloc_urb(0, GFP_KERNEL);
89473129
AK		 504 if (!mcs->rx_urb) {
505 usb_free_urb(mcs->tx_urb);
506 mcs->tx_urb = NULL;
c6ae522e 507 return 0;
89473129 508 }
c6ae522e
SO		 509
510 return 1;
511}
512
513/* Sets up state to be initially outside frame, gets receive urb,
514 * sets status to successful and then submits the urb to start
515 * receiving the data.
516 */
517static inline int mcs_receive_start(struct mcs_cb *mcs)
518{
519 mcs->rx_buff.in_frame = FALSE;
520 mcs->rx_buff.state = OUTSIDE_FRAME;
521
522 usb_fill_bulk_urb(mcs->rx_urb, mcs->usbdev,
523 usb_rcvbulkpipe(mcs->usbdev, mcs->ep_in),
524 mcs->in_buf, 4096, mcs_receive_irq, mcs);
525
526 mcs->rx_urb->status = 0;
527 return usb_submit_urb(mcs->rx_urb, GFP_KERNEL);
528}
529
530/* Finds the in and out endpoints for the mcs control block */
531static inline int mcs_find_endpoints(struct mcs_cb *mcs,
532 struct usb_host_endpoint *ep, int epnum)
533{
534 int i;
535 int ret = 0;
536
537 /* If no place to store the endpoints just return */
538 if (!ep)
539 return ret;
540
541 /* cycle through all endpoints, find the first two that are DIR_IN */
542 for (i = 0; i < epnum; i++) {
543 if (ep[i].desc.bEndpointAddress & USB_DIR_IN)
544 mcs->ep_in = ep[i].desc.bEndpointAddress;
545 else
546 mcs->ep_out = ep[i].desc.bEndpointAddress;
547
548 /* MosChip says that the chip has only two bulk
549 * endpoints. Find one for each direction and move on.
550 */
551 if ((mcs->ep_in != 0) && (mcs->ep_out != 0)) {
552 ret = 1;
553 break;
554 }
555 }
556
557 return ret;
558}
559
c4028958 560static void mcs_speed_work(struct work_struct *work)
c6ae522e 561{
c4028958 562 struct mcs_cb *mcs = container_of(work, struct mcs_cb, work);
c6ae522e
SO		 563 struct net_device *netdev = mcs->netdev;
564
565 mcs_speed_change(mcs);
566 netif_wake_queue(netdev);
567}
568
569/* Function to change the speed of the mcs7780. Fully supports SIR,
570 * MIR, and FIR speeds.
571 */
572static int mcs_speed_change(struct mcs_cb *mcs)
573{
574 int ret = 0;
575 int rst = 0;
576 int cnt = 0;
577 __u16 nspeed;
578 __u16 rval;
579
580 nspeed = mcs_speed_set[(mcs->new_speed >> 8) & 0x0f];
581
582 do {
583 mcs_get_reg(mcs, MCS_RESV_REG, &rval);
584 } while(cnt++ < 100 && (rval & MCS_IRINTX));
585
fb088674 586 if (cnt > 100) {
6c91023d 587 net_err_ratelimited("unable to change speed\n");
c6ae522e
SO		 588 ret = -EIO;
589 goto error;
590 }
591
592 mcs_get_reg(mcs, MCS_MODE_REG, &rval);
593
25985edc 594 /* MINRXPW values recommended by MosChip */
c6ae522e
SO		 595 if (mcs->new_speed <= 115200) {
596 rval &= ~MCS_FIR;
597
598 if ((rst = (mcs->speed > 115200)))
599 mcs_set_reg(mcs, MCS_MINRXPW_REG, 0);
600
601 } else if (mcs->new_speed <= 1152000) {
602 rval &= ~MCS_FIR;
603
604 if ((rst = !(mcs->speed == 576000 || mcs->speed == 1152000)))
605 mcs_set_reg(mcs, MCS_MINRXPW_REG, 5);
606
607 } else {
608 rval |= MCS_FIR;
609
610 if ((rst = (mcs->speed != 4000000)))
611 mcs_set_reg(mcs, MCS_MINRXPW_REG, 5);
612
613 }
614
615 rval &= ~MCS_SPEED_MASK;
616 rval |= nspeed;
617
618 ret = mcs_set_reg(mcs, MCS_MODE_REG, rval);
619 if (unlikely(ret))
620 goto error;
621
622 if (rst)
623 switch (mcs->transceiver_type) {
624 case MCS_TSC_VISHAY:
625 ret = mcs_setup_transceiver_vishay(mcs);
626 break;
627
628 case MCS_TSC_SHARP:
629 ret = mcs_setup_transceiver_sharp(mcs);
630 break;
631
632 case MCS_TSC_AGILENT:
633 ret = mcs_setup_transceiver_agilent(mcs);
634 break;
635
636 default:
637 ret = 1;
6c91023d
JP		 638 net_warn_ratelimited("Unknown transceiver type: %d\n",
639 mcs->transceiver_type);
c6ae522e
SO		 640 }
641 if (unlikely(ret))
642 goto error;
643
644 mcs_get_reg(mcs, MCS_MODE_REG, &rval);
645 rval &= ~MCS_RESET;
646 ret = mcs_set_reg(mcs, MCS_MODE_REG, rval);
647
648 mcs->speed = mcs->new_speed;
89473129
AK		 649error:
650 mcs->new_speed = 0;
651 return ret;
c6ae522e
SO		 652}
653
654/* Ioctl calls not supported at this time. Can be an area of future work. */
655static int mcs_net_ioctl(struct net_device *netdev, struct ifreq *rq, int cmd)
656{
657 /* struct if_irda_req *irq = (struct if_irda_req *)rq; */
658 /* struct mcs_cb *mcs = netdev_priv(netdev); */
659 int ret = 0;
660
661 switch (cmd) {
662 default:
663 ret = -EOPNOTSUPP;
664 }
665
666 return ret;
667}
668
669/* Network device is taken down, done by "ifconfig irda0 down" */
670static int mcs_net_close(struct net_device *netdev)
671{
672 int ret = 0;
673 struct mcs_cb *mcs = netdev_priv(netdev);
674
675 /* Stop transmit processing */
676 netif_stop_queue(netdev);
677
0ff80434
HK		 678 kfree_skb(mcs->rx_buff.skb);
679
c6ae522e
SO		 680 /* kill and free the receive and transmit URBs */
681 usb_kill_urb(mcs->rx_urb);
682 usb_free_urb(mcs->rx_urb);
683 usb_kill_urb(mcs->tx_urb);
684 usb_free_urb(mcs->tx_urb);
685
686 /* Stop and remove instance of IrLAP */
687 if (mcs->irlap)
688 irlap_close(mcs->irlap);
689
690 mcs->irlap = NULL;
691 return ret;
692}
693
694/* Network device is taken up, done by "ifconfig irda0 up" */
695static int mcs_net_open(struct net_device *netdev)
696{
697 struct mcs_cb *mcs = netdev_priv(netdev);
698 char hwname[16];
699 int ret = 0;
700
701 ret = usb_clear_halt(mcs->usbdev,
702 usb_sndbulkpipe(mcs->usbdev, mcs->ep_in));
703 if (ret)
704 goto error1;
705 ret = usb_clear_halt(mcs->usbdev,
706 usb_rcvbulkpipe(mcs->usbdev, mcs->ep_out));
707 if (ret)
708 goto error1;
709
710 ret = mcs_setup_transceiver(mcs);
711 if (ret)
712 goto error1;
713
714 ret = -ENOMEM;
715
716 /* Initialize for SIR/FIR to copy data directly into skb. */
717 mcs->receiving = 0;
718 mcs->rx_buff.truesize = IRDA_SKB_MAX_MTU;
719 mcs->rx_buff.skb = dev_alloc_skb(IRDA_SKB_MAX_MTU);
720 if (!mcs->rx_buff.skb)
721 goto error1;
722
723 skb_reserve(mcs->rx_buff.skb, 1);
724 mcs->rx_buff.head = mcs->rx_buff.skb->data;
c6ae522e
SO		 725
726 /*
727 * Now that everything should be initialized properly,
728 * Open new IrLAP layer instance to take care of us...
729 * Note : will send immediately a speed change...
730 */
731 sprintf(hwname, "usb#%d", mcs->usbdev->devnum);
732 mcs->irlap = irlap_open(netdev, &mcs->qos, hwname);
733 if (!mcs->irlap) {
6c91023d 734 net_err_ratelimited("mcs7780: irlap_open failed\n");
c6ae522e
SO		 735 goto error2;
736 }
737
738 if (!mcs_setup_urbs(mcs))
9b0f1d85 739 goto error3;
c6ae522e
SO		 740
741 ret = mcs_receive_start(mcs);
742 if (ret)
89473129 743 goto error4;
c6ae522e
SO		 744
745 netif_start_queue(netdev);
746 return 0;
747
89473129
AK		 748error4:
749 usb_free_urb(mcs->rx_urb);
750 usb_free_urb(mcs->tx_urb);
751error3:
752 irlap_close(mcs->irlap);
753error2:
754 kfree_skb(mcs->rx_buff.skb);
755error1:
756 return ret;
c6ae522e
SO		 757}
758
c6ae522e 759/* Receive callback function. */
7d12e780 760static void mcs_receive_irq(struct urb *urb)
c6ae522e
SO		 761{
762 __u8 *bytes;
763 struct mcs_cb *mcs = urb->context;
764 int i;
765 int ret;
766
767 if (!netif_running(mcs->netdev))
768 return;
769
770 if (urb->status)
771 return;
772
773 if (urb->actual_length > 0) {
774 bytes = urb->transfer_buffer;
775
776 /* MCS returns frames without BOF and EOF
777 * I assume it returns whole frames.
778 */
779 /* SIR speed */
780 if(mcs->speed < 576000) {
af049081 781 async_unwrap_char(mcs->netdev, &mcs->netdev->stats,
c6ae522e
SO		 782 &mcs->rx_buff, 0xc0);
783
784 for (i = 0; i < urb->actual_length; i++)
af049081 785 async_unwrap_char(mcs->netdev, &mcs->netdev->stats,
c6ae522e
SO		 786 &mcs->rx_buff, bytes[i]);
787
af049081 788 async_unwrap_char(mcs->netdev, &mcs->netdev->stats,
c6ae522e
SO		 789 &mcs->rx_buff, 0xc1);
790 }
791 /* MIR speed */
792 else if(mcs->speed == 576000 || mcs->speed == 1152000) {
793 mcs_unwrap_mir(mcs, urb->transfer_buffer,
794 urb->actual_length);
795 }
796 /* FIR speed */
797 else {
798 mcs_unwrap_fir(mcs, urb->transfer_buffer,
799 urb->actual_length);
800 }
c6ae522e
SO		 801 }
802
803 ret = usb_submit_urb(urb, GFP_ATOMIC);
804}
805
25985edc 806/* Transmit callback function. */
7d12e780 807static void mcs_send_irq(struct urb *urb)
c6ae522e
SO		 808{
809 struct mcs_cb *mcs = urb->context;
810 struct net_device *ndev = mcs->netdev;
811
812 if (unlikely(mcs->new_speed))
813 schedule_work(&mcs->work);
814 else
815 netif_wake_queue(ndev);
816}
817
25985edc 818/* Transmit callback function. */
6518bbb8
SH		 819static netdev_tx_t mcs_hard_xmit(struct sk_buff *skb,
820 struct net_device *ndev)
c6ae522e
SO		 821{
822 unsigned long flags;
823 struct mcs_cb *mcs;
824 int wraplen;
825 int ret = 0;
826
c6ae522e
SO		 827 netif_stop_queue(ndev);
828 mcs = netdev_priv(ndev);
829
830 spin_lock_irqsave(&mcs->lock, flags);
831
832 mcs->new_speed = irda_get_next_speed(skb);
833 if (likely(mcs->new_speed == mcs->speed))
834 mcs->new_speed = 0;
835
836 /* SIR speed */
837 if(mcs->speed < 576000) {
838 wraplen = mcs_wrap_sir_skb(skb, mcs->out_buf);
839 }
840 /* MIR speed */
841 else if(mcs->speed == 576000 || mcs->speed == 1152000) {
842 wraplen = mcs_wrap_mir_skb(skb, mcs->out_buf);
843 }
844 /* FIR speed */
845 else {
846 wraplen = mcs_wrap_fir_skb(skb, mcs->out_buf);
847 }
848 usb_fill_bulk_urb(mcs->tx_urb, mcs->usbdev,
849 usb_sndbulkpipe(mcs->usbdev, mcs->ep_out),
850 mcs->out_buf, wraplen, mcs_send_irq, mcs);
851
852 if ((ret = usb_submit_urb(mcs->tx_urb, GFP_ATOMIC))) {
6c91023d 853 net_err_ratelimited("failed tx_urb: %d\n", ret);
c6ae522e
SO		 854 switch (ret) {
855 case -ENODEV:
856 case -EPIPE:
857 break;
858 default:
af049081 859 mcs->netdev->stats.tx_errors++;
c6ae522e
SO		 860 netif_start_queue(ndev);
861 }
862 } else {
af049081
SH		 863 mcs->netdev->stats.tx_packets++;
864 mcs->netdev->stats.tx_bytes += skb->len;
c6ae522e
SO		 865 }
866
867 dev_kfree_skb(skb);
868 spin_unlock_irqrestore(&mcs->lock, flags);
4bd73ae2 869 return NETDEV_TX_OK;
c6ae522e
SO		 870}
871
ddc2a92d
SH		 872static const struct net_device_ops mcs_netdev_ops = {
873 .ndo_open = mcs_net_open,
874 .ndo_stop = mcs_net_close,
875 .ndo_start_xmit = mcs_hard_xmit,
876 .ndo_do_ioctl = mcs_net_ioctl,
877};
878
c6ae522e
SO		 879/*
880 * This function is called by the USB subsystem for each new device in the
881 * system. Need to verify the device and if it is, then start handling it.
882 */
883static int mcs_probe(struct usb_interface *intf,
884 const struct usb_device_id *id)
885{
886 struct usb_device *udev = interface_to_usbdev(intf);
887 struct net_device *ndev = NULL;
888 struct mcs_cb *mcs;
889 int ret = -ENOMEM;
890
891 ndev = alloc_irdadev(sizeof(*mcs));
892 if (!ndev)
893 goto error1;
894
955a9d20 895 pr_debug("MCS7780 USB-IrDA bridge found at %d.\n", udev->devnum);
c6ae522e 896
c6ae522e
SO		 897 SET_NETDEV_DEV(ndev, &intf->dev);
898
899 ret = usb_reset_configuration(udev);
900 if (ret != 0) {
6c91023d 901 net_err_ratelimited("mcs7780: usb reset configuration failed\n");
c6ae522e
SO		 902 goto error2;
903 }
904
905 mcs = netdev_priv(ndev);
906 mcs->usbdev = udev;
907 mcs->netdev = ndev;
908 spin_lock_init(&mcs->lock);
909
910 /* Initialize QoS for this device */
911 irda_init_max_qos_capabilies(&mcs->qos);
912
913 /* That's the Rx capability. */
914 mcs->qos.baud_rate.bits &=
915 IR_2400 | IR_9600 | IR_19200 | IR_38400 | IR_57600 | IR_115200
916 | IR_576000 | IR_1152000 | (IR_4000000 << 8);
917
918
919 mcs->qos.min_turn_time.bits &= qos_mtt_bits;
920 irda_qos_bits_to_value(&mcs->qos);
921
922 /* Speed change work initialisation*/
c4028958 923 INIT_WORK(&mcs->work, mcs_speed_work);
c6ae522e 924
ddc2a92d 925 ndev->netdev_ops = &mcs_netdev_ops;
c6ae522e 926
6734011f
PST		 927 if (!intf->cur_altsetting) {
928 ret = -ENOMEM;
c6ae522e 929 goto error2;
6734011f 930 }
c6ae522e
SO		 931
932 ret = mcs_find_endpoints(mcs, intf->cur_altsetting->endpoint,
933 intf->cur_altsetting->desc.bNumEndpoints);
934 if (!ret) {
935 ret = -ENODEV;
936 goto error2;
937 }
938
939 ret = register_netdev(ndev);
940 if (ret != 0)
941 goto error2;
942
955a9d20
JP		 943 pr_debug("IrDA: Registered MosChip MCS7780 device as %s\n",
944 ndev->name);
c6ae522e
SO		 945
946 mcs->transceiver_type = transceiver_type;
947 mcs->sir_tweak = sir_tweak;
948 mcs->receive_mode = receive_mode;
949
950 usb_set_intfdata(intf, mcs);
951 return 0;
952
89473129
AK		 953error2:
954 free_netdev(ndev);
c6ae522e 955
89473129
AK		 956error1:
957 return ret;
c6ae522e
SO		 958}
959
960/* The current device is removed, the USB layer tells us to shut down. */
961static void mcs_disconnect(struct usb_interface *intf)
962{
963 struct mcs_cb *mcs = usb_get_intfdata(intf);
964
965 if (!mcs)
966 return;
967
23f333a2 968 cancel_work_sync(&mcs->work);
c6ae522e
SO		 969
970 unregister_netdev(mcs->netdev);
971 free_netdev(mcs->netdev);
972
973 usb_set_intfdata(intf, NULL);
955a9d20 974 pr_debug("MCS7780 now disconnected.\n");
c6ae522e
SO		 975}
976
d632eb1b 977module_usb_driver(mcs_driver);
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