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import PULS_20160108
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / net / irda / stir4200.c
CommitLineData
1da177e4
LT		 1/*****************************************************************************
2*
3* Filename: stir4200.c
4* Version: 0.4
5* Description: Irda SigmaTel USB Dongle
6* Status: Experimental
7* Author: Stephen Hemminger <shemminger@osdl.org>
8*
9* Based on earlier driver by Paul Stewart <stewart@parc.com>
10*
11* Copyright (C) 2000, Roman Weissgaerber <weissg@vienna.at>
12* Copyright (C) 2001, Dag Brattli <dag@brattli.net>
13* Copyright (C) 2001, Jean Tourrilhes <jt@hpl.hp.com>
14* Copyright (C) 2004, Stephen Hemminger <shemminger@osdl.org>
15*
16* This program is free software; you can redistribute it and/or modify
17* it under the terms of the GNU General Public License as published by
798b6b19 18* the Free Software Foundation; either version 2 of the License.
1da177e4
LT		 19*
20* This program is distributed in the hope that it will be useful,
21* but WITHOUT ANY WARRANTY; without even the implied warranty of
22* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
23* GNU General Public License for more details.
24*
25* You should have received a copy of the GNU General Public License
26* along with this program; if not, write to the Free Software
27* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
28*
29*****************************************************************************/
30
31/*
32 * This dongle does no framing, and requires polling to receive the
33 * data. The STIr4200 has bulk in and out endpoints just like
34 * usr-irda devices, but the data it sends and receives is raw; like
35 * irtty, it needs to call the wrap and unwrap functions to add and
36 * remove SOF/BOF and escape characters to/from the frame.
37 */
38
39#include <linux/module.h>
40#include <linux/moduleparam.h>
41
42#include <linux/kernel.h>
43#include <linux/types.h>
44#include <linux/init.h>
45#include <linux/time.h>
46#include <linux/skbuff.h>
47#include <linux/netdevice.h>
48#include <linux/slab.h>
49#include <linux/delay.h>
50#include <linux/usb.h>
51#include <linux/crc32.h>
bc1d6937 52#include <linux/kthread.h>
7dfb7103 53#include <linux/freezer.h>
1da177e4 54#include <net/irda/irda.h>
1da177e4
LT		 55#include <net/irda/irda_device.h>
56#include <net/irda/wrapper.h>
57#include <net/irda/crc.h>
58#include <asm/byteorder.h>
59#include <asm/unaligned.h>
60
65ebe634 61MODULE_AUTHOR("Stephen Hemminger <shemminger@linux-foundation.org>");
1da177e4
LT		 62MODULE_DESCRIPTION("IrDA-USB Dongle Driver for SigmaTel STIr4200");
63MODULE_LICENSE("GPL");
64
65static int qos_mtt_bits = 0x07; /* 1 ms or more */
66module_param(qos_mtt_bits, int, 0);
67MODULE_PARM_DESC(qos_mtt_bits, "Minimum Turn Time");
68
69static int rx_sensitivity = 1; /* FIR 0..4, SIR 0..6 */
70module_param(rx_sensitivity, int, 0);
71MODULE_PARM_DESC(rx_sensitivity, "Set Receiver sensitivity (0-6, 0 is most sensitive)");
72
73static int tx_power = 0; /* 0 = highest ... 3 = lowest */
74module_param(tx_power, int, 0);
75MODULE_PARM_DESC(tx_power, "Set Transmitter power (0-3, 0 is highest power)");
76
77#define STIR_IRDA_HEADER 4
78#define CTRL_TIMEOUT 100 /* milliseconds */
79#define TRANSMIT_TIMEOUT 200 /* milliseconds */
80#define STIR_FIFO_SIZE 4096
81#define FIFO_REGS_SIZE 3
82
83enum FirChars {
84 FIR_CE = 0x7d,
85 FIR_XBOF = 0x7f,
86 FIR_EOF = 0x7e,
87};
88
89enum StirRequests {
90 REQ_WRITE_REG = 0x00,
91 REQ_READ_REG = 0x01,
92 REQ_READ_ROM = 0x02,
93 REQ_WRITE_SINGLE = 0x03,
94};
95
96/* Register offsets */
97enum StirRegs {
98 REG_RSVD=0,
99 REG_MODE,
100 REG_PDCLK,
101 REG_CTRL1,
102 REG_CTRL2,
103 REG_FIFOCTL,
104 REG_FIFOLSB,
105 REG_FIFOMSB,
106 REG_DPLL,
107 REG_IRDIG,
108 REG_TEST=15,
109};
110
111enum StirModeMask {
112 MODE_FIR = 0x80,
113 MODE_SIR = 0x20,
114 MODE_ASK = 0x10,
115 MODE_FASTRX = 0x08,
116 MODE_FFRSTEN = 0x04,
117 MODE_NRESET = 0x02,
118 MODE_2400 = 0x01,
119};
120
121enum StirPdclkMask {
122 PDCLK_4000000 = 0x02,
123 PDCLK_115200 = 0x09,
124 PDCLK_57600 = 0x13,
125 PDCLK_38400 = 0x1D,
126 PDCLK_19200 = 0x3B,
127 PDCLK_9600 = 0x77,
128 PDCLK_2400 = 0xDF,
129};
130
131enum StirCtrl1Mask {
132 CTRL1_SDMODE = 0x80,
133 CTRL1_RXSLOW = 0x40,
134 CTRL1_TXPWD = 0x10,
135 CTRL1_RXPWD = 0x08,
136 CTRL1_SRESET = 0x01,
137};
138
139enum StirCtrl2Mask {
140 CTRL2_SPWIDTH = 0x08,
141 CTRL2_REVID = 0x03,
142};
143
144enum StirFifoCtlMask {
1da177e4
LT		 145 FIFOCTL_DIR = 0x10,
146 FIFOCTL_CLR = 0x08,
147 FIFOCTL_EMPTY = 0x04,
1da177e4
LT		 148};
149
150enum StirDiagMask {
151 IRDIG_RXHIGH = 0x80,
152 IRDIG_RXLOW = 0x40,
153};
154
155enum StirTestMask {
156 TEST_PLLDOWN = 0x80,
157 TEST_LOOPIR = 0x40,
158 TEST_LOOPUSB = 0x20,
159 TEST_TSTENA = 0x10,
160 TEST_TSTOSC = 0x0F,
161};
162
163struct stir_cb {
164 struct usb_device *usbdev; /* init: probe_irda */
165 struct net_device *netdev; /* network layer */
166 struct irlap_cb *irlap; /* The link layer we are binded to */
af049081 167
1da177e4
LT		 168 struct qos_info qos;
169 unsigned speed; /* Current speed */
170
bc1d6937 171 struct task_struct *thread; /* transmit thread */
1da177e4
LT		 172
173 struct sk_buff *tx_pending;
174 void *io_buf; /* transmit/receive buffer */
175 __u8 *fifo_status;
176
177 iobuff_t rx_buff; /* receive unwrap state machine */
178 struct timeval rx_time;
179 int receiving;
180 struct urb *rx_urb;
181};
182
183
184/* These are the currently known USB ids */
185static struct usb_device_id dongles[] = {
186 /* SigmaTel, Inc, STIr4200 IrDA/USB Bridge */
187 { USB_DEVICE(0x066f, 0x4200) },
188 { }
189};
190
191MODULE_DEVICE_TABLE(usb, dongles);
192
193/* Send control message to set dongle register */
194static int write_reg(struct stir_cb *stir, __u16 reg, __u8 value)
195{
196 struct usb_device *dev = stir->usbdev;
197
198 pr_debug("%s: write reg %d = 0x%x\n",
199 stir->netdev->name, reg, value);
200 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
201 REQ_WRITE_SINGLE,
202 USB_DIR_OUT|USB_TYPE_VENDOR|USB_RECIP_DEVICE,
203 value, reg, NULL, 0,
204 CTRL_TIMEOUT);
205}
206
207/* Send control message to read multiple registers */
208static inline int read_reg(struct stir_cb *stir, __u16 reg,
209 __u8 *data, __u16 count)
210{
211 struct usb_device *dev = stir->usbdev;
212
213 return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
214 REQ_READ_REG,
215 USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
216 0, reg, data, count,
217 CTRL_TIMEOUT);
218}
219
220static inline int isfir(u32 speed)
221{
807540ba 222 return speed == 4000000;
1da177e4
LT		 223}
224
225/*
226 * Prepare a FIR IrDA frame for transmission to the USB dongle. The
227 * FIR transmit frame is documented in the datasheet. It consists of
228 * a two byte 0x55 0xAA sequence, two little-endian length bytes, a
229 * sequence of exactly 16 XBOF bytes of 0x7E, two BOF bytes of 0x7E,
230 * then the data escaped as follows:
231 *
232 * 0x7D -> 0x7D 0x5D
233 * 0x7E -> 0x7D 0x5E
234 * 0x7F -> 0x7D 0x5F
235 *
236 * Then, 4 bytes of little endian (stuffed) FCS follow, then two
237 * trailing EOF bytes of 0x7E.
238 */
239static inline __u8 *stuff_fir(__u8 *p, __u8 c)
240{
241 switch(c) {
242 case 0x7d:
243 case 0x7e:
244 case 0x7f:
245 *p++ = 0x7d;
246 c ^= IRDA_TRANS;
247 /* fall through */
248 default:
249 *p++ = c;
250 }
251 return p;
252}
253
254/* Take raw data in skb and put it wrapped into buf */
255static unsigned wrap_fir_skb(const struct sk_buff *skb, __u8 *buf)
256{
257 __u8 *ptr = buf;
258 __u32 fcs = ~(crc32_le(~0, skb->data, skb->len));
259 __u16 wraplen;
260 int i;
261
262 /* Header */
263 buf[0] = 0x55;
264 buf[1] = 0xAA;
265
266 ptr = buf + STIR_IRDA_HEADER;
267 memset(ptr, 0x7f, 16);
268 ptr += 16;
269
270 /* BOF */
271 *ptr++ = 0x7e;
272 *ptr++ = 0x7e;
273
274 /* Address / Control / Information */
275 for (i = 0; i < skb->len; i++)
276 ptr = stuff_fir(ptr, skb->data[i]);
277
278 /* FCS */
279 ptr = stuff_fir(ptr, fcs & 0xff);
280 ptr = stuff_fir(ptr, (fcs >> 8) & 0xff);
281 ptr = stuff_fir(ptr, (fcs >> 16) & 0xff);
282 ptr = stuff_fir(ptr, (fcs >> 24) & 0xff);
283
284 /* EOFs */
285 *ptr++ = 0x7e;
286 *ptr++ = 0x7e;
287
288 /* Total length, minus the header */
289 wraplen = (ptr - buf) - STIR_IRDA_HEADER;
290 buf[2] = wraplen & 0xff;
291 buf[3] = (wraplen >> 8) & 0xff;
292
293 return wraplen + STIR_IRDA_HEADER;
294}
295
296static unsigned wrap_sir_skb(struct sk_buff *skb, __u8 *buf)
297{
298 __u16 wraplen;
299
300 wraplen = async_wrap_skb(skb, buf + STIR_IRDA_HEADER,
301 STIR_FIFO_SIZE - STIR_IRDA_HEADER);
302 buf[0] = 0x55;
303 buf[1] = 0xAA;
304 buf[2] = wraplen & 0xff;
305 buf[3] = (wraplen >> 8) & 0xff;
306
307 return wraplen + STIR_IRDA_HEADER;
308}
309
310/*
311 * Frame is fully formed in the rx_buff so check crc
312 * and pass up to irlap
313 * setup for next receive
314 */
315static void fir_eof(struct stir_cb *stir)
316{
317 iobuff_t *rx_buff = &stir->rx_buff;
318 int len = rx_buff->len - 4;
319 struct sk_buff *skb, *nskb;
320 __u32 fcs;
321
322 if (unlikely(len <= 0)) {
323 pr_debug("%s: short frame len %d\n",
324 stir->netdev->name, len);
325
af049081
SH		 326 ++stir->netdev->stats.rx_errors;
327 ++stir->netdev->stats.rx_length_errors;
1da177e4
LT		 328 return;
329 }
330
331 fcs = ~(crc32_le(~0, rx_buff->data, len));
6caf52a4 332 if (fcs != get_unaligned_le32(rx_buff->data + len)) {
1da177e4 333 pr_debug("crc error calc 0x%x len %d\n", fcs, len);
af049081
SH		 334 stir->netdev->stats.rx_errors++;
335 stir->netdev->stats.rx_crc_errors++;
1da177e4
LT		 336 return;
337 }
338
339 /* if frame is short then just copy it */
340 if (len < IRDA_RX_COPY_THRESHOLD) {
341 nskb = dev_alloc_skb(len + 1);
342 if (unlikely(!nskb)) {
af049081 343 ++stir->netdev->stats.rx_dropped;
1da177e4
LT		 344 return;
345 }
346 skb_reserve(nskb, 1);
347 skb = nskb;
27d7ff46 348 skb_copy_to_linear_data(nskb, rx_buff->data, len);
1da177e4
LT		 349 } else {
350 nskb = dev_alloc_skb(rx_buff->truesize);
351 if (unlikely(!nskb)) {
af049081 352 ++stir->netdev->stats.rx_dropped;
1da177e4
LT		 353 return;
354 }
355 skb_reserve(nskb, 1);
356 skb = rx_buff->skb;
357 rx_buff->skb = nskb;
358 rx_buff->head = nskb->data;
359 }
360
361 skb_put(skb, len);
362
459a98ed 363 skb_reset_mac_header(skb);
1da177e4
LT		 364 skb->protocol = htons(ETH_P_IRDA);
365 skb->dev = stir->netdev;
366
367 netif_rx(skb);
368
af049081
SH		 369 stir->netdev->stats.rx_packets++;
370 stir->netdev->stats.rx_bytes += len;
1da177e4
LT		 371
372 rx_buff->data = rx_buff->head;
373 rx_buff->len = 0;
374}
375
376/* Unwrap FIR stuffed data and bump it to IrLAP */
377static void stir_fir_chars(struct stir_cb *stir,
378 const __u8 *bytes, int len)
379{
380 iobuff_t *rx_buff = &stir->rx_buff;
381 int i;
382
383 for (i = 0; i < len; i++) {
384 __u8 byte = bytes[i];
385
386 switch(rx_buff->state) {
387 case OUTSIDE_FRAME:
388 /* ignore garbage till start of frame */
389 if (unlikely(byte != FIR_EOF))
390 continue;
391 /* Now receiving frame */
392 rx_buff->state = BEGIN_FRAME;
393
394 /* Time to initialize receive buffer */
395 rx_buff->data = rx_buff->head;
396 rx_buff->len = 0;
397 continue;
398
399 case LINK_ESCAPE:
400 if (byte == FIR_EOF) {
401 pr_debug("%s: got EOF after escape\n",
402 stir->netdev->name);
403 goto frame_error;
404 }
405 rx_buff->state = INSIDE_FRAME;
406 byte ^= IRDA_TRANS;
407 break;
408
409 case BEGIN_FRAME:
410 /* ignore multiple BOF/EOF */
411 if (byte == FIR_EOF)
412 continue;
413 rx_buff->state = INSIDE_FRAME;
414 rx_buff->in_frame = TRUE;
415
416 /* fall through */
417 case INSIDE_FRAME:
418 switch(byte) {
419 case FIR_CE:
420 rx_buff->state = LINK_ESCAPE;
421 continue;
422 case FIR_XBOF:
423 /* 0x7f is not used in this framing */
424 pr_debug("%s: got XBOF without escape\n",
425 stir->netdev->name);
426 goto frame_error;
427 case FIR_EOF:
428 rx_buff->state = OUTSIDE_FRAME;
429 rx_buff->in_frame = FALSE;
430 fir_eof(stir);
431 continue;
432 }
433 break;
434 }
435
436 /* add byte to rx buffer */
437 if (unlikely(rx_buff->len >= rx_buff->truesize)) {
438 pr_debug("%s: fir frame exceeds %d\n",
439 stir->netdev->name, rx_buff->truesize);
af049081 440 ++stir->netdev->stats.rx_over_errors;
1da177e4
LT		 441 goto error_recovery;
442 }
443
444 rx_buff->data[rx_buff->len++] = byte;
445 continue;
446
447 frame_error:
af049081 448 ++stir->netdev->stats.rx_frame_errors;
1da177e4
LT		 449
450 error_recovery:
af049081 451 ++stir->netdev->stats.rx_errors;
1da177e4
LT		 452 rx_buff->state = OUTSIDE_FRAME;
453 rx_buff->in_frame = FALSE;
454 }
455}
456
457/* Unwrap SIR stuffed data and bump it up to IrLAP */
458static void stir_sir_chars(struct stir_cb *stir,
459 const __u8 *bytes, int len)
460{
461 int i;
462
463 for (i = 0; i < len; i++)
af049081 464 async_unwrap_char(stir->netdev, &stir->netdev->stats,
1da177e4
LT		 465 &stir->rx_buff, bytes[i]);
466}
467
468static inline void unwrap_chars(struct stir_cb *stir,
469 const __u8 *bytes, int length)
470{
471 if (isfir(stir->speed))
472 stir_fir_chars(stir, bytes, length);
473 else
474 stir_sir_chars(stir, bytes, length);
475}
476
477/* Mode parameters for each speed */
478static const struct {
479 unsigned speed;
480 __u8 pdclk;
481} stir_modes[] = {
482 { 2400, PDCLK_2400 },
483 { 9600, PDCLK_9600 },
484 { 19200, PDCLK_19200 },
485 { 38400, PDCLK_38400 },
486 { 57600, PDCLK_57600 },
487 { 115200, PDCLK_115200 },
488 { 4000000, PDCLK_4000000 },
489};
490
491
492/*
493 * Setup chip for speed.
494 * Called at startup to initialize the chip
495 * and on speed changes.
496 *
497 * Note: Write multiple registers doesn't appear to work
498 */
499static int change_speed(struct stir_cb *stir, unsigned speed)
500{
501 int i, err;
502 __u8 mode;
503
504 for (i = 0; i < ARRAY_SIZE(stir_modes); ++i) {
505 if (speed == stir_modes[i].speed)
506 goto found;
507 }
508
4dc89948 509 dev_warn(&stir->netdev->dev, "invalid speed %d\n", speed);
1da177e4
LT		 510 return -EINVAL;
511
512 found:
513 pr_debug("speed change from %d to %d\n", stir->speed, speed);
514
515 /* Reset modulator */
516 err = write_reg(stir, REG_CTRL1, CTRL1_SRESET);
517 if (err)
518 goto out;
519
520 /* Undocumented magic to tweak the DPLL */
521 err = write_reg(stir, REG_DPLL, 0x15);
522 if (err)
523 goto out;
524
525 /* Set clock */
526 err = write_reg(stir, REG_PDCLK, stir_modes[i].pdclk);
527 if (err)
528 goto out;
529
530 mode = MODE_NRESET | MODE_FASTRX;
531 if (isfir(speed))
532 mode |= MODE_FIR | MODE_FFRSTEN;
533 else
534 mode |= MODE_SIR;
535
536 if (speed == 2400)
537 mode |= MODE_2400;
538
539 err = write_reg(stir, REG_MODE, mode);
540 if (err)
541 goto out;
542
543 /* This resets TEMIC style transceiver if any. */
544 err = write_reg(stir, REG_CTRL1,
545 CTRL1_SDMODE | (tx_power & 3) << 1);
546 if (err)
547 goto out;
548
549 err = write_reg(stir, REG_CTRL1, (tx_power & 3) << 1);
550 if (err)
551 goto out;
552
553 /* Reset sensitivity */
554 err = write_reg(stir, REG_CTRL2, (rx_sensitivity & 7) << 5);
555 out:
556 stir->speed = speed;
557 return err;
558}
559
560/*
561 * Called from net/core when new frame is available.
562 */
6518bbb8
SH		 563static netdev_tx_t stir_hard_xmit(struct sk_buff *skb,
564 struct net_device *netdev)
1da177e4
LT		 565{
566 struct stir_cb *stir = netdev_priv(netdev);
567
568 netif_stop_queue(netdev);
569
570 /* the IRDA wrapping routines don't deal with non linear skb */
571 SKB_LINEAR_ASSERT(skb);
572
573 skb = xchg(&stir->tx_pending, skb);
bc1d6937 574 wake_up_process(stir->thread);
1da177e4
LT		 575
576 /* this should never happen unless stop/wakeup problem */
577 if (unlikely(skb)) {
578 WARN_ON(1);
579 dev_kfree_skb(skb);
580 }
581
6ed10654 582 return NETDEV_TX_OK;
1da177e4
LT		 583}
584
585/*
586 * Wait for the transmit FIFO to have space for next data
587 *
588 * If space < 0 then wait till FIFO completely drains.
589 * FYI: can take up to 13 seconds at 2400baud.
590 */
591static int fifo_txwait(struct stir_cb *stir, int space)
592{
593 int err;
594 unsigned long count, status;
ea332912 595 unsigned long prev_count = 0x1fff;
1da177e4
LT		 596
597 /* Read FIFO status and count */
ea332912 598 for (;; prev_count = count) {
1da177e4
LT		 599 err = read_reg(stir, REG_FIFOCTL, stir->fifo_status,
600 FIFO_REGS_SIZE);
601 if (unlikely(err != FIFO_REGS_SIZE)) {
4dc89948
GKH		 602 dev_warn(&stir->netdev->dev,
603 "FIFO register read error: %d\n", err);
1da177e4
LT		 604
605 return err;
606 }
607
608 status = stir->fifo_status[0];
609 count = (unsigned)(stir->fifo_status[2] & 0x1f) << 8
610 | stir->fifo_status[1];
611
612 pr_debug("fifo status 0x%lx count %lu\n", status, count);
613
1da177e4 614 /* is fifo receiving already, or empty */
8e95a202
JP		 615 if (!(status & FIFOCTL_DIR) ||
616 (status & FIFOCTL_EMPTY))
1da177e4
LT		 617 return 0;
618
619 if (signal_pending(current))
620 return -EINTR;
621
622 /* shutting down? */
8e95a202
JP		 623 if (!netif_running(stir->netdev) ||
624 !netif_device_present(stir->netdev))
1da177e4
LT		 625 return -ESHUTDOWN;
626
627 /* only waiting for some space */
628 if (space >= 0 && STIR_FIFO_SIZE - 4 > space + count)
629 return 0;
630
ea332912
OH		 631 /* queue confused */
632 if (prev_count < count)
633 break;
634
1da177e4
LT		 635 /* estimate transfer time for remaining chars */
636 msleep((count * 8000) / stir->speed);
637 }
638
639 err = write_reg(stir, REG_FIFOCTL, FIFOCTL_CLR);
640 if (err)
641 return err;
642 err = write_reg(stir, REG_FIFOCTL, 0);
643 if (err)
644 return err;
645
646 return 0;
647}
648
649
650/* Wait for turnaround delay before starting transmit. */
651static void turnaround_delay(const struct stir_cb *stir, long us)
652{
653 long ticks;
654 struct timeval now;
655
656 if (us <= 0)
657 return;
658
659 do_gettimeofday(&now);
660 if (now.tv_sec - stir->rx_time.tv_sec > 0)
661 us -= USEC_PER_SEC;
662 us -= now.tv_usec - stir->rx_time.tv_usec;
663 if (us < 10)
664 return;
665
666 ticks = us / (1000000 / HZ);
3173c890
NA		 667 if (ticks > 0)
668 schedule_timeout_interruptible(1 + ticks);
669 else
1da177e4
LT		 670 udelay(us);
671}
672
673/*
674 * Start receiver by submitting a request to the receive pipe.
675 * If nothing is available it will return after rx_interval.
676 */
677static int receive_start(struct stir_cb *stir)
678{
679 /* reset state */
680 stir->receiving = 1;
681
682 stir->rx_buff.in_frame = FALSE;
683 stir->rx_buff.state = OUTSIDE_FRAME;
684
685 stir->rx_urb->status = 0;
686 return usb_submit_urb(stir->rx_urb, GFP_KERNEL);
687}
688
689/* Stop all pending receive Urb's */
690static void receive_stop(struct stir_cb *stir)
691{
692 stir->receiving = 0;
693 usb_kill_urb(stir->rx_urb);
694
695 if (stir->rx_buff.in_frame)
af049081 696 stir->netdev->stats.collisions++;
1da177e4
LT		 697}
698/*
699 * Wrap data in socket buffer and send it.
700 */
701static void stir_send(struct stir_cb *stir, struct sk_buff *skb)
702{
703 unsigned wraplen;
704 int first_frame = 0;
705
706 /* if receiving, need to turnaround */
707 if (stir->receiving) {
708 receive_stop(stir);
709 turnaround_delay(stir, irda_get_mtt(skb));
710 first_frame = 1;
711 }
712
713 if (isfir(stir->speed))
714 wraplen = wrap_fir_skb(skb, stir->io_buf);
715 else
716 wraplen = wrap_sir_skb(skb, stir->io_buf);
717
718 /* check for space available in fifo */
719 if (!first_frame)
720 fifo_txwait(stir, wraplen);
721
af049081
SH		 722 stir->netdev->stats.tx_packets++;
723 stir->netdev->stats.tx_bytes += skb->len;
1da177e4
LT		 724 stir->netdev->trans_start = jiffies;
725 pr_debug("send %d (%d)\n", skb->len, wraplen);
726
727 if (usb_bulk_msg(stir->usbdev, usb_sndbulkpipe(stir->usbdev, 1),
728 stir->io_buf, wraplen,
729 NULL, TRANSMIT_TIMEOUT))
af049081 730 stir->netdev->stats.tx_errors++;
1da177e4
LT		 731}
732
733/*
734 * Transmit state machine thread
735 */
736static int stir_transmit_thread(void *arg)
737{
738 struct stir_cb *stir = arg;
739 struct net_device *dev = stir->netdev;
740 struct sk_buff *skb;
741
6fa3eb70
S		 742 set_freezable();
743
744 while (!kthread_freezable_should_stop(NULL)) {
1da177e4
LT		 745#ifdef CONFIG_PM
746 /* if suspending, then power off and wait */
3e1d1d28 747 if (unlikely(freezing(current))) {
1da177e4
LT		 748 if (stir->receiving)
749 receive_stop(stir);
750 else
751 fifo_txwait(stir, -1);
752
753 write_reg(stir, REG_CTRL1, CTRL1_TXPWD|CTRL1_RXPWD);
754
a0acae0e 755 try_to_freeze();
1da177e4
LT		 756
757 if (change_speed(stir, stir->speed))
758 break;
759 }
760#endif
761
762 /* if something to send? */
763 skb = xchg(&stir->tx_pending, NULL);
764 if (skb) {
765 unsigned new_speed = irda_get_next_speed(skb);
766 netif_wake_queue(dev);
767
768 if (skb->len > 0)
769 stir_send(stir, skb);
770 dev_kfree_skb(skb);
771
772 if ((new_speed != -1) && (stir->speed != new_speed)) {
773 if (fifo_txwait(stir, -1) ||
774 change_speed(stir, new_speed))
775 break;
776 }
777 continue;
778 }
779
780 /* nothing to send? start receiving */
8e95a202
JP		 781 if (!stir->receiving &&
782 irda_device_txqueue_empty(dev)) {
1da177e4
LT		 783 /* Wait otherwise chip gets confused. */
784 if (fifo_txwait(stir, -1))
785 break;
786
787 if (unlikely(receive_start(stir))) {
788 if (net_ratelimit())
880c9c66
GKH		 789 dev_info(&dev->dev,
790 "%s: receive usb submit failed\n",
791 stir->netdev->name);
1da177e4
LT		 792 stir->receiving = 0;
793 msleep(10);
794 continue;
795 }
796 }
797
798 /* sleep if nothing to send */
bc1d6937
CH		 799 set_current_state(TASK_INTERRUPTIBLE);
800 schedule();
1da177e4 801
bc1d6937
CH		 802 }
803 return 0;
1da177e4
LT		 804}
805
806
807/*
808 * USB bulk receive completion callback.
809 * Wakes up every ms (usb round trip) with wrapped
810 * data.
811 */
7d12e780 812static void stir_rcv_irq(struct urb *urb)
1da177e4
LT		 813{
814 struct stir_cb *stir = urb->context;
815 int err;
816
817 /* in process of stopping, just drop data */
818 if (!netif_running(stir->netdev))
819 return;
820
821 /* unlink, shutdown, unplug, other nasties */
822 if (urb->status != 0)
823 return;
824
825 if (urb->actual_length > 0) {
826 pr_debug("receive %d\n", urb->actual_length);
827 unwrap_chars(stir, urb->transfer_buffer,
828 urb->actual_length);
829
1da177e4
LT		 830 do_gettimeofday(&stir->rx_time);
831 }
832
833 /* kernel thread is stopping receiver don't resubmit */
834 if (!stir->receiving)
835 return;
836
837 /* resubmit existing urb */
838 err = usb_submit_urb(urb, GFP_ATOMIC);
839
840 /* in case of error, the kernel thread will restart us */
841 if (err) {
4dc89948
GKH		 842 dev_warn(&stir->netdev->dev, "usb receive submit error: %d\n",
843 err);
1da177e4 844 stir->receiving = 0;
bc1d6937 845 wake_up_process(stir->thread);
1da177e4
LT		 846 }
847}
848
849/*
850 * Function stir_net_open (dev)
851 *
852 * Network device is taken up. Usually this is done by "ifconfig irda0 up"
853 */
854static int stir_net_open(struct net_device *netdev)
855{
856 struct stir_cb *stir = netdev_priv(netdev);
857 int err;
858 char hwname[16];
859
860 err = usb_clear_halt(stir->usbdev, usb_sndbulkpipe(stir->usbdev, 1));
861 if (err)
862 goto err_out1;
863 err = usb_clear_halt(stir->usbdev, usb_rcvbulkpipe(stir->usbdev, 2));
864 if (err)
865 goto err_out1;
866
867 err = change_speed(stir, 9600);
868 if (err)
869 goto err_out1;
870
871 err = -ENOMEM;
872
873 /* Initialize for SIR/FIR to copy data directly into skb. */
874 stir->receiving = 0;
875 stir->rx_buff.truesize = IRDA_SKB_MAX_MTU;
876 stir->rx_buff.skb = dev_alloc_skb(IRDA_SKB_MAX_MTU);
877 if (!stir->rx_buff.skb)
878 goto err_out1;
879
880 skb_reserve(stir->rx_buff.skb, 1);
881 stir->rx_buff.head = stir->rx_buff.skb->data;
882 do_gettimeofday(&stir->rx_time);
883
884 stir->rx_urb = usb_alloc_urb(0, GFP_KERNEL);
885 if (!stir->rx_urb)
886 goto err_out2;
887
888 stir->io_buf = kmalloc(STIR_FIFO_SIZE, GFP_KERNEL);
889 if (!stir->io_buf)
890 goto err_out3;
891
892 usb_fill_bulk_urb(stir->rx_urb, stir->usbdev,
893 usb_rcvbulkpipe(stir->usbdev, 2),
894 stir->io_buf, STIR_FIFO_SIZE,
895 stir_rcv_irq, stir);
896
897 stir->fifo_status = kmalloc(FIFO_REGS_SIZE, GFP_KERNEL);
898 if (!stir->fifo_status)
899 goto err_out4;
900
901 /*
902 * Now that everything should be initialized properly,
903 * Open new IrLAP layer instance to take care of us...
904 * Note : will send immediately a speed change...
905 */
906 sprintf(hwname, "usb#%d", stir->usbdev->devnum);
907 stir->irlap = irlap_open(netdev, &stir->qos, hwname);
908 if (!stir->irlap) {
46267f4c 909 dev_err(&stir->usbdev->dev, "irlap_open failed\n");
1da177e4
LT		 910 goto err_out5;
911 }
912
913 /** Start kernel thread for transmit. */
bc1d6937
CH		 914 stir->thread = kthread_run(stir_transmit_thread, stir,
915 "%s", stir->netdev->name);
916 if (IS_ERR(stir->thread)) {
917 err = PTR_ERR(stir->thread);
46267f4c 918 dev_err(&stir->usbdev->dev, "unable to start kernel thread\n");
1da177e4
LT		 919 goto err_out6;
920 }
921
922 netif_start_queue(netdev);
923
924 return 0;
925
926 err_out6:
927 irlap_close(stir->irlap);
928 err_out5:
929 kfree(stir->fifo_status);
930 err_out4:
931 kfree(stir->io_buf);
932 err_out3:
933 usb_free_urb(stir->rx_urb);
934 err_out2:
935 kfree_skb(stir->rx_buff.skb);
936 err_out1:
937 return err;
938}
939
940/*
941 * Function stir_net_close (stir)
942 *
943 * Network device is taken down. Usually this is done by
944 * "ifconfig irda0 down"
945 */
946static int stir_net_close(struct net_device *netdev)
947{
948 struct stir_cb *stir = netdev_priv(netdev);
949
950 /* Stop transmit processing */
951 netif_stop_queue(netdev);
952
953 /* Kill transmit thread */
bc1d6937 954 kthread_stop(stir->thread);
1da177e4
LT		 955 kfree(stir->fifo_status);
956
957 /* Mop up receive urb's */
958 usb_kill_urb(stir->rx_urb);
959
960 kfree(stir->io_buf);
961 usb_free_urb(stir->rx_urb);
962 kfree_skb(stir->rx_buff.skb);
963
964 /* Stop and remove instance of IrLAP */
965 if (stir->irlap)
966 irlap_close(stir->irlap);
967
968 stir->irlap = NULL;
969
970 return 0;
971}
972
973/*
974 * IOCTLs : Extra out-of-band network commands...
975 */
976static int stir_net_ioctl(struct net_device *netdev, struct ifreq *rq, int cmd)
977{
978 struct if_irda_req *irq = (struct if_irda_req *) rq;
979 struct stir_cb *stir = netdev_priv(netdev);
980 int ret = 0;
981
982 switch (cmd) {
983 case SIOCSBANDWIDTH: /* Set bandwidth */
984 if (!capable(CAP_NET_ADMIN))
985 return -EPERM;
986
987 /* Check if the device is still there */
988 if (netif_device_present(stir->netdev))
989 ret = change_speed(stir, irq->ifr_baudrate);
990 break;
991
992 case SIOCSMEDIABUSY: /* Set media busy */
993 if (!capable(CAP_NET_ADMIN))
994 return -EPERM;
995
996 /* Check if the IrDA stack is still there */
997 if (netif_running(stir->netdev))
998 irda_device_set_media_busy(stir->netdev, TRUE);
999 break;
1000
1001 case SIOCGRECEIVING:
1002 /* Only approximately true */
1003 irq->ifr_receiving = stir->receiving;
1004 break;
1005
1006 default:
1007 ret = -EOPNOTSUPP;
1008 }
1009
1010 return ret;
1011}
1012
66ee279f
SH		 1013static const struct net_device_ops stir_netdev_ops = {
1014 .ndo_open = stir_net_open,
1015 .ndo_stop = stir_net_close,
1016 .ndo_start_xmit = stir_hard_xmit,
1017 .ndo_do_ioctl = stir_net_ioctl,
1018};
1019
1da177e4
LT		 1020/*
1021 * This routine is called by the USB subsystem for each new device
1022 * in the system. We need to check if the device is ours, and in
1023 * this case start handling it.
1024 * Note : it might be worth protecting this function by a global
1025 * spinlock... Or not, because maybe USB already deal with that...
1026 */
1027static int stir_probe(struct usb_interface *intf,
1028 const struct usb_device_id *id)
1029{
1030 struct usb_device *dev = interface_to_usbdev(intf);
1031 struct stir_cb *stir = NULL;
1032 struct net_device *net;
1033 int ret = -ENOMEM;
1034
1035 /* Allocate network device container. */
1036 net = alloc_irdadev(sizeof(*stir));
1037 if(!net)
1038 goto err_out1;
1039
1da177e4
LT		 1040 SET_NETDEV_DEV(net, &intf->dev);
1041 stir = netdev_priv(net);
1042 stir->netdev = net;
1043 stir->usbdev = dev;
1044
1045 ret = usb_reset_configuration(dev);
1046 if (ret != 0) {
46267f4c 1047 dev_err(&intf->dev, "usb reset configuration failed\n");
1da177e4
LT		 1048 goto err_out2;
1049 }
1050
1051 printk(KERN_INFO "SigmaTel STIr4200 IRDA/USB found at address %d, "
1052 "Vendor: %x, Product: %x\n",
1053 dev->devnum, le16_to_cpu(dev->descriptor.idVendor),
1054 le16_to_cpu(dev->descriptor.idProduct));
1055
1056 /* Initialize QoS for this device */
1057 irda_init_max_qos_capabilies(&stir->qos);
1058
1059 /* That's the Rx capability. */
1060 stir->qos.baud_rate.bits &= IR_2400 | IR_9600 | IR_19200 |
1061 IR_38400 | IR_57600 | IR_115200 |
1062 (IR_4000000 << 8);
1063 stir->qos.min_turn_time.bits &= qos_mtt_bits;
1064 irda_qos_bits_to_value(&stir->qos);
1065
1da177e4 1066 /* Override the network functions we need to use */
66ee279f 1067 net->netdev_ops = &stir_netdev_ops;
1da177e4
LT		 1068
1069 ret = register_netdev(net);
1070 if (ret != 0)
1071 goto err_out2;
1072
880c9c66
GKH		 1073 dev_info(&intf->dev, "IrDA: Registered SigmaTel device %s\n",
1074 net->name);
1da177e4
LT		 1075
1076 usb_set_intfdata(intf, stir);
1077
1078 return 0;
1079
1080err_out2:
1081 free_netdev(net);
1082err_out1:
1083 return ret;
1084}
1085
1086/*
1087 * The current device is removed, the USB layer tell us to shut it down...
1088 */
1089static void stir_disconnect(struct usb_interface *intf)
1090{
1091 struct stir_cb *stir = usb_get_intfdata(intf);
1092
1093 if (!stir)
1094 return;
1095
1096 unregister_netdev(stir->netdev);
1097 free_netdev(stir->netdev);
1098
1099 usb_set_intfdata(intf, NULL);
1100}
1101
1102#ifdef CONFIG_PM
27d72e85
DB		 1103/* USB suspend, so power off the transmitter/receiver */
1104static int stir_suspend(struct usb_interface *intf, pm_message_t message)
1da177e4
LT		 1105{
1106 struct stir_cb *stir = usb_get_intfdata(intf);
1107
1108 netif_device_detach(stir->netdev);
1109 return 0;
1110}
1111
1112/* Coming out of suspend, so reset hardware */
1113static int stir_resume(struct usb_interface *intf)
1114{
1115 struct stir_cb *stir = usb_get_intfdata(intf);
1116
1117 netif_device_attach(stir->netdev);
1118
1119 /* receiver restarted when send thread wakes up */
1120 return 0;
1121}
1122#endif
1123
1124/*
1125 * USB device callbacks
1126 */
1127static struct usb_driver irda_driver = {
1da177e4
LT		 1128 .name = "stir4200",
1129 .probe = stir_probe,
1130 .disconnect = stir_disconnect,
1131 .id_table = dongles,
1132#ifdef CONFIG_PM
1133 .suspend = stir_suspend,
1134 .resume = stir_resume,
1135#endif
1136};
1137
d632eb1b 1138module_usb_driver(irda_driver);
kernel source for telekom puls (alcatel/mediatek)