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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> | |
51 | #include <linux/init.h> | |
52 | #include <linux/slab.h> | |
53 | #include <linux/module.h> | |
54 | #include <linux/kref.h> | |
55 | #include <linux/usb.h> | |
56 | #include <linux/device.h> | |
57 | #include <linux/crc32.h> | |
58 | ||
59 | #include <asm/unaligned.h> | |
60 | #include <asm/byteorder.h> | |
61 | #include <asm/uaccess.h> | |
62 | ||
63 | #include <net/irda/irda.h> | |
64 | #include <net/irda/wrapper.h> | |
65 | #include <net/irda/crc.h> | |
66 | ||
67 | #include "mcs7780.h" | |
68 | ||
69 | #define MCS_VENDOR_ID 0x9710 | |
70 | #define MCS_PRODUCT_ID 0x7780 | |
71 | ||
72 | static struct usb_device_id mcs_table[] = { | |
73 | /* MosChip Corp., MCS7780 FIR-USB Adapter */ | |
74 | {USB_DEVICE(MCS_VENDOR_ID, MCS_PRODUCT_ID)}, | |
75 | {}, | |
76 | }; | |
77 | ||
78 | MODULE_AUTHOR("Brian Pugh <bpugh@cs.pdx.edu>"); | |
79 | MODULE_DESCRIPTION("IrDA-USB Dongle Driver for MosChip MCS7780"); | |
80 | MODULE_VERSION("0.3alpha"); | |
81 | MODULE_LICENSE("GPL"); | |
82 | ||
83 | MODULE_DEVICE_TABLE(usb, mcs_table); | |
84 | ||
85 | static int qos_mtt_bits = 0x07 /* > 1ms */ ; | |
86 | module_param(qos_mtt_bits, int, 0); | |
87 | MODULE_PARM_DESC(qos_mtt_bits, "Minimum Turn Time"); | |
88 | ||
89 | static int receive_mode = 0x1; | |
90 | module_param(receive_mode, int, 0); | |
91 | MODULE_PARM_DESC(receive_mode, | |
92 | "Receive mode of the device (1:fast, 0:slow, default:1)"); | |
93 | ||
94 | static int sir_tweak = 1; | |
95 | module_param(sir_tweak, int, 0444); | |
96 | MODULE_PARM_DESC(sir_tweak, | |
97 | "Default pulse width (1:1.6us, 0:3/16 bit, default:1)."); | |
98 | ||
99 | static int transceiver_type = MCS_TSC_VISHAY; | |
100 | module_param(transceiver_type, int, 0444); | |
101 | MODULE_PARM_DESC(transceiver_type, "IR transceiver type, see mcs7780.h."); | |
102 | ||
7263ade1 | 103 | static struct usb_driver mcs_driver = { |
c6ae522e SO |
104 | .name = "mcs7780", |
105 | .probe = mcs_probe, | |
106 | .disconnect = mcs_disconnect, | |
107 | .id_table = mcs_table, | |
108 | }; | |
109 | ||
110 | /* speed flag selection by direct addressing. | |
111 | addr = (speed >> 8) & 0x0f | |
112 | ||
113 | 0x1 57600 0x2 115200 0x4 1152000 0x5 9600 | |
114 | 0x6 38400 0x9 2400 0xa 576000 0xb 19200 | |
115 | ||
116 | 4Mbps (or 2400) must be checked separately. Since it also has | |
117 | to be programmed in a different manner that is not a big problem. | |
118 | */ | |
119 | static __u16 mcs_speed_set[16] = { 0, | |
120 | MCS_SPEED_57600, | |
121 | MCS_SPEED_115200, | |
122 | 0, | |
123 | MCS_SPEED_1152000, | |
124 | MCS_SPEED_9600, | |
125 | MCS_SPEED_38400, | |
126 | 0, 0, | |
127 | MCS_SPEED_2400, | |
128 | MCS_SPEED_576000, | |
129 | MCS_SPEED_19200, | |
130 | 0, 0, 0, | |
131 | }; | |
132 | ||
133 | /* Set given 16 bit register with a 16 bit value. Send control message | |
134 | * to set dongle register. */ | |
135 | static int mcs_set_reg(struct mcs_cb *mcs, __u16 reg, __u16 val) | |
136 | { | |
137 | struct usb_device *dev = mcs->usbdev; | |
138 | return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ, | |
139 | MCS_WR_RTYPE, val, reg, NULL, 0, | |
140 | msecs_to_jiffies(MCS_CTRL_TIMEOUT)); | |
141 | } | |
142 | ||
143 | /* Get 16 bit register value. Send contol message to read dongle register. */ | |
144 | static int mcs_get_reg(struct mcs_cb *mcs, __u16 reg, __u16 * val) | |
145 | { | |
146 | struct usb_device *dev = mcs->usbdev; | |
147 | int ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ, | |
148 | MCS_RD_RTYPE, 0, reg, val, 2, | |
149 | msecs_to_jiffies(MCS_CTRL_TIMEOUT)); | |
150 | ||
151 | return ret; | |
152 | } | |
153 | ||
154 | /* Setup a communication between mcs7780 and TFDU chips. It is described | |
155 | * in more detail in the data sheet. The setup sequence puts the the | |
156 | * vishay tranceiver into high speed mode. It will also receive SIR speed | |
157 | * packets but at reduced sensitivity. | |
158 | */ | |
159 | ||
160 | /* 0: OK 1:ERROR */ | |
161 | static inline int mcs_setup_transceiver_vishay(struct mcs_cb *mcs) | |
162 | { | |
163 | int ret = 0; | |
164 | __u16 rval; | |
165 | ||
166 | /* mcs_get_reg should read exactly two bytes from the dongle */ | |
167 | ret = mcs_get_reg(mcs, MCS_XCVR_REG, &rval); | |
168 | if (unlikely(ret != 2)) { | |
169 | ret = -EIO; | |
170 | goto error; | |
171 | } | |
172 | ||
173 | /* The MCS_XCVR_CONF bit puts the transceiver into configuration | |
174 | * mode. The MCS_MODE0 bit must start out high (1) and then | |
175 | * transition to low and the MCS_STFIR and MCS_MODE1 bits must | |
176 | * be low. | |
177 | */ | |
178 | rval |= (MCS_MODE0 | MCS_XCVR_CONF); | |
179 | rval &= ~MCS_STFIR; | |
180 | rval &= ~MCS_MODE1; | |
181 | ret = mcs_set_reg(mcs, MCS_XCVR_REG, rval); | |
182 | if (unlikely(ret)) | |
183 | goto error; | |
184 | ||
185 | rval &= ~MCS_MODE0; | |
186 | ret = mcs_set_reg(mcs, MCS_XCVR_REG, rval); | |
187 | if (unlikely(ret)) | |
188 | goto error; | |
189 | ||
190 | rval &= ~MCS_XCVR_CONF; | |
191 | ret = mcs_set_reg(mcs, MCS_XCVR_REG, rval); | |
192 | if (unlikely(ret)) | |
193 | goto error; | |
194 | ||
195 | ret = 0; | |
196 | error: | |
197 | return ret; | |
198 | } | |
199 | ||
200 | /* Setup a communication between mcs7780 and agilent chip. */ | |
201 | static inline int mcs_setup_transceiver_agilent(struct mcs_cb *mcs) | |
202 | { | |
203 | IRDA_WARNING("This transceiver type is not supported yet."); | |
204 | return 1; | |
205 | } | |
206 | ||
207 | /* Setup a communication between mcs7780 and sharp chip. */ | |
208 | static inline int mcs_setup_transceiver_sharp(struct mcs_cb *mcs) | |
209 | { | |
210 | IRDA_WARNING("This transceiver type is not supported yet."); | |
211 | return 1; | |
212 | } | |
213 | ||
214 | /* Common setup for all transceivers */ | |
215 | static inline int mcs_setup_transceiver(struct mcs_cb *mcs) | |
216 | { | |
217 | int ret = 0; | |
218 | __u16 rval; | |
219 | char *msg; | |
220 | ||
221 | msg = "Basic transceiver setup error."; | |
222 | ||
223 | /* read value of MODE Register, set the DRIVER and RESET bits | |
224 | * and write value back out to MODE Register | |
225 | */ | |
226 | ret = mcs_get_reg(mcs, MCS_MODE_REG, &rval); | |
227 | if(unlikely(ret != 2)) | |
228 | goto error; | |
229 | rval |= MCS_DRIVER; /* put the mcs7780 into configuration mode. */ | |
230 | ret = mcs_set_reg(mcs, MCS_MODE_REG, rval); | |
231 | if(unlikely(ret)) | |
232 | goto error; | |
233 | ||
234 | rval = 0; /* set min pulse width to 0 initially. */ | |
235 | ret = mcs_set_reg(mcs, MCS_MINRXPW_REG, rval); | |
236 | if(unlikely(ret)) | |
237 | goto error; | |
238 | ||
239 | ret = mcs_get_reg(mcs, MCS_MODE_REG, &rval); | |
240 | if(unlikely(ret != 2)) | |
241 | goto error; | |
242 | ||
243 | rval &= ~MCS_FIR; /* turn off fir mode. */ | |
244 | if(mcs->sir_tweak) | |
245 | rval |= MCS_SIR16US; /* 1.6us pulse width */ | |
246 | else | |
247 | rval &= ~MCS_SIR16US; /* 3/16 bit time pulse width */ | |
248 | ||
249 | /* make sure ask mode and back to back packets are off. */ | |
250 | rval &= ~(MCS_BBTG | MCS_ASK); | |
251 | ||
252 | rval &= ~MCS_SPEED_MASK; | |
253 | rval |= MCS_SPEED_9600; /* make sure initial speed is 9600. */ | |
254 | mcs->speed = 9600; | |
255 | mcs->new_speed = 0; /* new_speed is set to 0 */ | |
256 | rval &= ~MCS_PLLPWDN; /* disable power down. */ | |
257 | ||
258 | /* make sure device determines direction and that the auto send sip | |
259 | * pulse are on. | |
260 | */ | |
261 | rval |= MCS_DTD | MCS_SIPEN; | |
262 | ||
263 | ret = mcs_set_reg(mcs, MCS_MODE_REG, rval); | |
264 | if(unlikely(ret)) | |
265 | goto error; | |
266 | ||
267 | msg = "transceiver model specific setup error."; | |
268 | switch (mcs->transceiver_type) { | |
269 | case MCS_TSC_VISHAY: | |
270 | ret = mcs_setup_transceiver_vishay(mcs); | |
271 | break; | |
272 | ||
273 | case MCS_TSC_SHARP: | |
274 | ret = mcs_setup_transceiver_sharp(mcs); | |
275 | break; | |
276 | ||
277 | case MCS_TSC_AGILENT: | |
278 | ret = mcs_setup_transceiver_agilent(mcs); | |
279 | break; | |
280 | ||
281 | default: | |
282 | IRDA_WARNING("Unknown transceiver type: %d", | |
283 | mcs->transceiver_type); | |
284 | ret = 1; | |
285 | } | |
286 | if (unlikely(ret)) | |
287 | goto error; | |
288 | ||
289 | /* If transceiver is not SHARP, then if receive mode set | |
290 | * on the RXFAST bit in the XCVR Register otherwise unset it | |
291 | */ | |
292 | if (mcs->transceiver_type != MCS_TSC_SHARP) { | |
293 | ||
294 | ret = mcs_get_reg(mcs, MCS_XCVR_REG, &rval); | |
295 | if (unlikely(ret != 2)) | |
296 | goto error; | |
297 | if (mcs->receive_mode) | |
298 | rval |= MCS_RXFAST; | |
299 | else | |
300 | rval &= ~MCS_RXFAST; | |
301 | ret = mcs_set_reg(mcs, MCS_XCVR_REG, rval); | |
302 | if (unlikely(ret)) | |
303 | goto error; | |
304 | } | |
305 | ||
306 | msg = "transceiver reset."; | |
307 | ||
308 | ret = mcs_get_reg(mcs, MCS_MODE_REG, &rval); | |
309 | if (unlikely(ret != 2)) | |
310 | goto error; | |
311 | ||
312 | /* reset the mcs7780 so all changes take effect. */ | |
313 | rval &= ~MCS_RESET; | |
314 | ret = mcs_set_reg(mcs, MCS_MODE_REG, rval); | |
315 | if (unlikely(ret)) | |
316 | goto error; | |
317 | else | |
318 | return ret; | |
319 | ||
320 | error: | |
321 | IRDA_ERROR("%s", msg); | |
322 | return ret; | |
323 | } | |
324 | ||
325 | /* Wraps the data in format for SIR */ | |
326 | static inline int mcs_wrap_sir_skb(struct sk_buff *skb, __u8 * buf) | |
327 | { | |
328 | int wraplen; | |
329 | ||
330 | /* 2: full frame length, including "the length" */ | |
331 | wraplen = async_wrap_skb(skb, buf + 2, 4094); | |
332 | ||
333 | wraplen += 2; | |
334 | buf[0] = wraplen & 0xff; | |
335 | buf[1] = (wraplen >> 8) & 0xff; | |
336 | ||
337 | return wraplen; | |
338 | } | |
339 | ||
340 | /* Wraps the data in format for FIR */ | |
341 | static unsigned mcs_wrap_fir_skb(const struct sk_buff *skb, __u8 *buf) | |
342 | { | |
343 | unsigned int len = 0; | |
344 | __u32 fcs = ~(crc32_le(~0, skb->data, skb->len)); | |
345 | ||
346 | /* add 2 bytes for length value and 4 bytes for fcs. */ | |
347 | len = skb->len + 6; | |
348 | ||
349 | /* The mcs7780 requires that the first two bytes are the packet | |
350 | * length in little endian order. Note: the length value includes | |
351 | * the two bytes for the length value itself. | |
352 | */ | |
353 | buf[0] = len & 0xff; | |
354 | buf[1] = (len >> 8) & 0xff; | |
355 | /* copy the data into the tx buffer. */ | |
d626f62b | 356 | skb_copy_from_linear_data(skb, buf + 2, skb->len); |
c6ae522e SO |
357 | /* put the fcs in the last four bytes in little endian order. */ |
358 | buf[len - 4] = fcs & 0xff; | |
359 | buf[len - 3] = (fcs >> 8) & 0xff; | |
360 | buf[len - 2] = (fcs >> 16) & 0xff; | |
361 | buf[len - 1] = (fcs >> 24) & 0xff; | |
362 | ||
363 | return len; | |
364 | } | |
365 | ||
366 | /* Wraps the data in format for MIR */ | |
367 | static unsigned mcs_wrap_mir_skb(const struct sk_buff *skb, __u8 *buf) | |
368 | { | |
369 | __u16 fcs = 0; | |
370 | int len = skb->len + 4; | |
371 | ||
372 | fcs = ~(irda_calc_crc16(~fcs, skb->data, skb->len)); | |
373 | /* put the total packet length in first. Note: packet length | |
374 | * value includes the two bytes that hold the packet length | |
375 | * itself. | |
376 | */ | |
377 | buf[0] = len & 0xff; | |
378 | buf[1] = (len >> 8) & 0xff; | |
379 | /* copy the data */ | |
d626f62b | 380 | skb_copy_from_linear_data(skb, buf + 2, skb->len); |
c6ae522e SO |
381 | /* put the fcs in last two bytes in little endian order. */ |
382 | buf[len - 2] = fcs & 0xff; | |
383 | buf[len - 1] = (fcs >> 8) & 0xff; | |
384 | ||
385 | return len; | |
386 | } | |
387 | ||
388 | /* Unwrap received packets at MIR speed. A 16 bit crc_ccitt checksum is | |
389 | * used for the fcs. When performed over the entire packet the result | |
390 | * should be GOOD_FCS = 0xf0b8. Hands the unwrapped data off to the IrDA | |
391 | * layer via a sk_buff. | |
392 | */ | |
393 | static void mcs_unwrap_mir(struct mcs_cb *mcs, __u8 *buf, int len) | |
394 | { | |
395 | __u16 fcs; | |
396 | int new_len; | |
397 | struct sk_buff *skb; | |
398 | ||
399 | /* Assume that the frames are going to fill a single packet | |
400 | * rather than span multiple packets. | |
401 | */ | |
402 | ||
403 | new_len = len - 2; | |
404 | if(unlikely(new_len <= 0)) { | |
405 | IRDA_ERROR("%s short frame length %d\n", | |
406 | mcs->netdev->name, new_len); | |
407 | ++mcs->stats.rx_errors; | |
408 | ++mcs->stats.rx_length_errors; | |
409 | return; | |
410 | } | |
411 | fcs = 0; | |
412 | fcs = irda_calc_crc16(~fcs, buf, len); | |
413 | ||
414 | if(fcs != GOOD_FCS) { | |
415 | IRDA_ERROR("crc error calc 0x%x len %d\n", | |
416 | fcs, new_len); | |
417 | mcs->stats.rx_errors++; | |
418 | mcs->stats.rx_crc_errors++; | |
419 | return; | |
420 | } | |
421 | ||
422 | skb = dev_alloc_skb(new_len + 1); | |
423 | if(unlikely(!skb)) { | |
424 | ++mcs->stats.rx_dropped; | |
425 | return; | |
426 | } | |
427 | ||
428 | skb_reserve(skb, 1); | |
429 | memcpy(skb->data, buf, new_len); | |
430 | skb_put(skb, new_len); | |
459a98ed | 431 | skb_reset_mac_header(skb); |
c6ae522e SO |
432 | skb->protocol = htons(ETH_P_IRDA); |
433 | skb->dev = mcs->netdev; | |
434 | ||
435 | netif_rx(skb); | |
436 | ||
437 | mcs->stats.rx_packets++; | |
438 | mcs->stats.rx_bytes += new_len; | |
439 | ||
440 | return; | |
441 | } | |
442 | ||
443 | /* Unwrap received packets at FIR speed. A 32 bit crc_ccitt checksum is | |
444 | * used for the fcs. Hands the unwrapped data off to the IrDA | |
445 | * layer via a sk_buff. | |
446 | */ | |
447 | static void mcs_unwrap_fir(struct mcs_cb *mcs, __u8 *buf, int len) | |
448 | { | |
449 | __u32 fcs; | |
450 | int new_len; | |
451 | struct sk_buff *skb; | |
452 | ||
453 | /* Assume that the frames are going to fill a single packet | |
454 | * rather than span multiple packets. This is most likely a false | |
455 | * assumption. | |
456 | */ | |
457 | ||
458 | new_len = len - 4; | |
459 | if(unlikely(new_len <= 0)) { | |
460 | IRDA_ERROR("%s short frame length %d\n", | |
461 | mcs->netdev->name, new_len); | |
462 | ++mcs->stats.rx_errors; | |
463 | ++mcs->stats.rx_length_errors; | |
464 | return; | |
465 | } | |
466 | ||
467 | fcs = ~(crc32_le(~0, buf, new_len)); | |
468 | if(fcs != le32_to_cpu(get_unaligned((u32 *)(buf+new_len)))) { | |
469 | IRDA_ERROR("crc error calc 0x%x len %d\n", fcs, new_len); | |
470 | mcs->stats.rx_errors++; | |
471 | mcs->stats.rx_crc_errors++; | |
472 | return; | |
473 | } | |
474 | ||
475 | skb = dev_alloc_skb(new_len + 1); | |
476 | if(unlikely(!skb)) { | |
477 | ++mcs->stats.rx_dropped; | |
478 | return; | |
479 | } | |
480 | ||
481 | skb_reserve(skb, 1); | |
482 | memcpy(skb->data, buf, new_len); | |
483 | skb_put(skb, new_len); | |
459a98ed | 484 | skb_reset_mac_header(skb); |
c6ae522e SO |
485 | skb->protocol = htons(ETH_P_IRDA); |
486 | skb->dev = mcs->netdev; | |
487 | ||
488 | netif_rx(skb); | |
489 | ||
490 | mcs->stats.rx_packets++; | |
491 | mcs->stats.rx_bytes += new_len; | |
492 | ||
493 | return; | |
494 | } | |
495 | ||
496 | ||
497 | /* Allocates urbs for both receive and transmit. | |
498 | * If alloc fails return error code 0 (fail) otherwise | |
499 | * return error code 1 (success). | |
500 | */ | |
501 | static inline int mcs_setup_urbs(struct mcs_cb *mcs) | |
502 | { | |
503 | mcs->rx_urb = NULL; | |
504 | ||
505 | mcs->tx_urb = usb_alloc_urb(0, GFP_KERNEL); | |
506 | if (!mcs->tx_urb) | |
507 | return 0; | |
508 | ||
509 | mcs->rx_urb = usb_alloc_urb(0, GFP_KERNEL); | |
510 | if (!mcs->rx_urb) | |
511 | return 0; | |
512 | ||
513 | return 1; | |
514 | } | |
515 | ||
516 | /* Sets up state to be initially outside frame, gets receive urb, | |
517 | * sets status to successful and then submits the urb to start | |
518 | * receiving the data. | |
519 | */ | |
520 | static inline int mcs_receive_start(struct mcs_cb *mcs) | |
521 | { | |
522 | mcs->rx_buff.in_frame = FALSE; | |
523 | mcs->rx_buff.state = OUTSIDE_FRAME; | |
524 | ||
525 | usb_fill_bulk_urb(mcs->rx_urb, mcs->usbdev, | |
526 | usb_rcvbulkpipe(mcs->usbdev, mcs->ep_in), | |
527 | mcs->in_buf, 4096, mcs_receive_irq, mcs); | |
528 | ||
529 | mcs->rx_urb->status = 0; | |
530 | return usb_submit_urb(mcs->rx_urb, GFP_KERNEL); | |
531 | } | |
532 | ||
533 | /* Finds the in and out endpoints for the mcs control block */ | |
534 | static inline int mcs_find_endpoints(struct mcs_cb *mcs, | |
535 | struct usb_host_endpoint *ep, int epnum) | |
536 | { | |
537 | int i; | |
538 | int ret = 0; | |
539 | ||
540 | /* If no place to store the endpoints just return */ | |
541 | if (!ep) | |
542 | return ret; | |
543 | ||
544 | /* cycle through all endpoints, find the first two that are DIR_IN */ | |
545 | for (i = 0; i < epnum; i++) { | |
546 | if (ep[i].desc.bEndpointAddress & USB_DIR_IN) | |
547 | mcs->ep_in = ep[i].desc.bEndpointAddress; | |
548 | else | |
549 | mcs->ep_out = ep[i].desc.bEndpointAddress; | |
550 | ||
551 | /* MosChip says that the chip has only two bulk | |
552 | * endpoints. Find one for each direction and move on. | |
553 | */ | |
554 | if ((mcs->ep_in != 0) && (mcs->ep_out != 0)) { | |
555 | ret = 1; | |
556 | break; | |
557 | } | |
558 | } | |
559 | ||
560 | return ret; | |
561 | } | |
562 | ||
c4028958 | 563 | static void mcs_speed_work(struct work_struct *work) |
c6ae522e | 564 | { |
c4028958 | 565 | struct mcs_cb *mcs = container_of(work, struct mcs_cb, work); |
c6ae522e SO |
566 | struct net_device *netdev = mcs->netdev; |
567 | ||
568 | mcs_speed_change(mcs); | |
569 | netif_wake_queue(netdev); | |
570 | } | |
571 | ||
572 | /* Function to change the speed of the mcs7780. Fully supports SIR, | |
573 | * MIR, and FIR speeds. | |
574 | */ | |
575 | static int mcs_speed_change(struct mcs_cb *mcs) | |
576 | { | |
577 | int ret = 0; | |
578 | int rst = 0; | |
579 | int cnt = 0; | |
580 | __u16 nspeed; | |
581 | __u16 rval; | |
582 | ||
583 | nspeed = mcs_speed_set[(mcs->new_speed >> 8) & 0x0f]; | |
584 | ||
585 | do { | |
586 | mcs_get_reg(mcs, MCS_RESV_REG, &rval); | |
587 | } while(cnt++ < 100 && (rval & MCS_IRINTX)); | |
588 | ||
589 | if(cnt >= 100) { | |
590 | IRDA_ERROR("unable to change speed"); | |
591 | ret = -EIO; | |
592 | goto error; | |
593 | } | |
594 | ||
595 | mcs_get_reg(mcs, MCS_MODE_REG, &rval); | |
596 | ||
597 | /* MINRXPW values recomended by MosChip */ | |
598 | if (mcs->new_speed <= 115200) { | |
599 | rval &= ~MCS_FIR; | |
600 | ||
601 | if ((rst = (mcs->speed > 115200))) | |
602 | mcs_set_reg(mcs, MCS_MINRXPW_REG, 0); | |
603 | ||
604 | } else if (mcs->new_speed <= 1152000) { | |
605 | rval &= ~MCS_FIR; | |
606 | ||
607 | if ((rst = !(mcs->speed == 576000 || mcs->speed == 1152000))) | |
608 | mcs_set_reg(mcs, MCS_MINRXPW_REG, 5); | |
609 | ||
610 | } else { | |
611 | rval |= MCS_FIR; | |
612 | ||
613 | if ((rst = (mcs->speed != 4000000))) | |
614 | mcs_set_reg(mcs, MCS_MINRXPW_REG, 5); | |
615 | ||
616 | } | |
617 | ||
618 | rval &= ~MCS_SPEED_MASK; | |
619 | rval |= nspeed; | |
620 | ||
621 | ret = mcs_set_reg(mcs, MCS_MODE_REG, rval); | |
622 | if (unlikely(ret)) | |
623 | goto error; | |
624 | ||
625 | if (rst) | |
626 | switch (mcs->transceiver_type) { | |
627 | case MCS_TSC_VISHAY: | |
628 | ret = mcs_setup_transceiver_vishay(mcs); | |
629 | break; | |
630 | ||
631 | case MCS_TSC_SHARP: | |
632 | ret = mcs_setup_transceiver_sharp(mcs); | |
633 | break; | |
634 | ||
635 | case MCS_TSC_AGILENT: | |
636 | ret = mcs_setup_transceiver_agilent(mcs); | |
637 | break; | |
638 | ||
639 | default: | |
640 | ret = 1; | |
641 | IRDA_WARNING("Unknown transceiver type: %d", | |
642 | mcs->transceiver_type); | |
643 | } | |
644 | if (unlikely(ret)) | |
645 | goto error; | |
646 | ||
647 | mcs_get_reg(mcs, MCS_MODE_REG, &rval); | |
648 | rval &= ~MCS_RESET; | |
649 | ret = mcs_set_reg(mcs, MCS_MODE_REG, rval); | |
650 | ||
651 | mcs->speed = mcs->new_speed; | |
652 | error: | |
653 | mcs->new_speed = 0; | |
654 | return ret; | |
655 | } | |
656 | ||
657 | /* Ioctl calls not supported at this time. Can be an area of future work. */ | |
658 | static int mcs_net_ioctl(struct net_device *netdev, struct ifreq *rq, int cmd) | |
659 | { | |
660 | /* struct if_irda_req *irq = (struct if_irda_req *)rq; */ | |
661 | /* struct mcs_cb *mcs = netdev_priv(netdev); */ | |
662 | int ret = 0; | |
663 | ||
664 | switch (cmd) { | |
665 | default: | |
666 | ret = -EOPNOTSUPP; | |
667 | } | |
668 | ||
669 | return ret; | |
670 | } | |
671 | ||
672 | /* Network device is taken down, done by "ifconfig irda0 down" */ | |
673 | static int mcs_net_close(struct net_device *netdev) | |
674 | { | |
675 | int ret = 0; | |
676 | struct mcs_cb *mcs = netdev_priv(netdev); | |
677 | ||
678 | /* Stop transmit processing */ | |
679 | netif_stop_queue(netdev); | |
680 | ||
681 | /* kill and free the receive and transmit URBs */ | |
682 | usb_kill_urb(mcs->rx_urb); | |
683 | usb_free_urb(mcs->rx_urb); | |
684 | usb_kill_urb(mcs->tx_urb); | |
685 | usb_free_urb(mcs->tx_urb); | |
686 | ||
687 | /* Stop and remove instance of IrLAP */ | |
688 | if (mcs->irlap) | |
689 | irlap_close(mcs->irlap); | |
690 | ||
691 | mcs->irlap = NULL; | |
692 | return ret; | |
693 | } | |
694 | ||
695 | /* Network device is taken up, done by "ifconfig irda0 up" */ | |
696 | static int mcs_net_open(struct net_device *netdev) | |
697 | { | |
698 | struct mcs_cb *mcs = netdev_priv(netdev); | |
699 | char hwname[16]; | |
700 | int ret = 0; | |
701 | ||
702 | ret = usb_clear_halt(mcs->usbdev, | |
703 | usb_sndbulkpipe(mcs->usbdev, mcs->ep_in)); | |
704 | if (ret) | |
705 | goto error1; | |
706 | ret = usb_clear_halt(mcs->usbdev, | |
707 | usb_rcvbulkpipe(mcs->usbdev, mcs->ep_out)); | |
708 | if (ret) | |
709 | goto error1; | |
710 | ||
711 | ret = mcs_setup_transceiver(mcs); | |
712 | if (ret) | |
713 | goto error1; | |
714 | ||
715 | ret = -ENOMEM; | |
716 | ||
717 | /* Initialize for SIR/FIR to copy data directly into skb. */ | |
718 | mcs->receiving = 0; | |
719 | mcs->rx_buff.truesize = IRDA_SKB_MAX_MTU; | |
720 | mcs->rx_buff.skb = dev_alloc_skb(IRDA_SKB_MAX_MTU); | |
721 | if (!mcs->rx_buff.skb) | |
722 | goto error1; | |
723 | ||
724 | skb_reserve(mcs->rx_buff.skb, 1); | |
725 | mcs->rx_buff.head = mcs->rx_buff.skb->data; | |
726 | do_gettimeofday(&mcs->rx_time); | |
727 | ||
728 | /* | |
729 | * Now that everything should be initialized properly, | |
730 | * Open new IrLAP layer instance to take care of us... | |
731 | * Note : will send immediately a speed change... | |
732 | */ | |
733 | sprintf(hwname, "usb#%d", mcs->usbdev->devnum); | |
734 | mcs->irlap = irlap_open(netdev, &mcs->qos, hwname); | |
735 | if (!mcs->irlap) { | |
736 | IRDA_ERROR("mcs7780: irlap_open failed"); | |
737 | goto error2; | |
738 | } | |
739 | ||
740 | if (!mcs_setup_urbs(mcs)) | |
741 | goto error3; | |
742 | ||
743 | ret = mcs_receive_start(mcs); | |
744 | if (ret) | |
745 | goto error3; | |
746 | ||
747 | netif_start_queue(netdev); | |
748 | return 0; | |
749 | ||
750 | error3: | |
751 | irlap_close(mcs->irlap); | |
752 | error2: | |
753 | kfree_skb(mcs->rx_buff.skb); | |
754 | error1: | |
755 | return ret; | |
756 | } | |
757 | ||
758 | ||
759 | /* Get device stats for /proc/net/dev and ifconfig */ | |
760 | static struct net_device_stats *mcs_net_get_stats(struct net_device *netdev) | |
761 | { | |
762 | struct mcs_cb *mcs = netdev_priv(netdev); | |
763 | return &mcs->stats; | |
764 | } | |
765 | ||
766 | /* Receive callback function. */ | |
7d12e780 | 767 | static void mcs_receive_irq(struct urb *urb) |
c6ae522e SO |
768 | { |
769 | __u8 *bytes; | |
770 | struct mcs_cb *mcs = urb->context; | |
771 | int i; | |
772 | int ret; | |
773 | ||
774 | if (!netif_running(mcs->netdev)) | |
775 | return; | |
776 | ||
777 | if (urb->status) | |
778 | return; | |
779 | ||
780 | if (urb->actual_length > 0) { | |
781 | bytes = urb->transfer_buffer; | |
782 | ||
783 | /* MCS returns frames without BOF and EOF | |
784 | * I assume it returns whole frames. | |
785 | */ | |
786 | /* SIR speed */ | |
787 | if(mcs->speed < 576000) { | |
788 | async_unwrap_char(mcs->netdev, &mcs->stats, | |
789 | &mcs->rx_buff, 0xc0); | |
790 | ||
791 | for (i = 0; i < urb->actual_length; i++) | |
792 | async_unwrap_char(mcs->netdev, &mcs->stats, | |
793 | &mcs->rx_buff, bytes[i]); | |
794 | ||
795 | async_unwrap_char(mcs->netdev, &mcs->stats, | |
796 | &mcs->rx_buff, 0xc1); | |
797 | } | |
798 | /* MIR speed */ | |
799 | else if(mcs->speed == 576000 || mcs->speed == 1152000) { | |
800 | mcs_unwrap_mir(mcs, urb->transfer_buffer, | |
801 | urb->actual_length); | |
802 | } | |
803 | /* FIR speed */ | |
804 | else { | |
805 | mcs_unwrap_fir(mcs, urb->transfer_buffer, | |
806 | urb->actual_length); | |
807 | } | |
808 | mcs->netdev->last_rx = jiffies; | |
809 | do_gettimeofday(&mcs->rx_time); | |
810 | } | |
811 | ||
812 | ret = usb_submit_urb(urb, GFP_ATOMIC); | |
813 | } | |
814 | ||
815 | /* Transmit callback funtion. */ | |
7d12e780 | 816 | static void mcs_send_irq(struct urb *urb) |
c6ae522e SO |
817 | { |
818 | struct mcs_cb *mcs = urb->context; | |
819 | struct net_device *ndev = mcs->netdev; | |
820 | ||
821 | if (unlikely(mcs->new_speed)) | |
822 | schedule_work(&mcs->work); | |
823 | else | |
824 | netif_wake_queue(ndev); | |
825 | } | |
826 | ||
827 | /* Transmit callback funtion. */ | |
828 | static int mcs_hard_xmit(struct sk_buff *skb, struct net_device *ndev) | |
829 | { | |
830 | unsigned long flags; | |
831 | struct mcs_cb *mcs; | |
832 | int wraplen; | |
833 | int ret = 0; | |
834 | ||
835 | ||
836 | if (skb == NULL || ndev == NULL) | |
837 | return -EINVAL; | |
838 | ||
839 | netif_stop_queue(ndev); | |
840 | mcs = netdev_priv(ndev); | |
841 | ||
842 | spin_lock_irqsave(&mcs->lock, flags); | |
843 | ||
844 | mcs->new_speed = irda_get_next_speed(skb); | |
845 | if (likely(mcs->new_speed == mcs->speed)) | |
846 | mcs->new_speed = 0; | |
847 | ||
848 | /* SIR speed */ | |
849 | if(mcs->speed < 576000) { | |
850 | wraplen = mcs_wrap_sir_skb(skb, mcs->out_buf); | |
851 | } | |
852 | /* MIR speed */ | |
853 | else if(mcs->speed == 576000 || mcs->speed == 1152000) { | |
854 | wraplen = mcs_wrap_mir_skb(skb, mcs->out_buf); | |
855 | } | |
856 | /* FIR speed */ | |
857 | else { | |
858 | wraplen = mcs_wrap_fir_skb(skb, mcs->out_buf); | |
859 | } | |
860 | usb_fill_bulk_urb(mcs->tx_urb, mcs->usbdev, | |
861 | usb_sndbulkpipe(mcs->usbdev, mcs->ep_out), | |
862 | mcs->out_buf, wraplen, mcs_send_irq, mcs); | |
863 | ||
864 | if ((ret = usb_submit_urb(mcs->tx_urb, GFP_ATOMIC))) { | |
865 | IRDA_ERROR("failed tx_urb: %d", ret); | |
866 | switch (ret) { | |
867 | case -ENODEV: | |
868 | case -EPIPE: | |
869 | break; | |
870 | default: | |
871 | mcs->stats.tx_errors++; | |
872 | netif_start_queue(ndev); | |
873 | } | |
874 | } else { | |
875 | mcs->stats.tx_packets++; | |
876 | mcs->stats.tx_bytes += skb->len; | |
877 | } | |
878 | ||
879 | dev_kfree_skb(skb); | |
880 | spin_unlock_irqrestore(&mcs->lock, flags); | |
881 | return ret; | |
882 | } | |
883 | ||
884 | /* | |
885 | * This function is called by the USB subsystem for each new device in the | |
886 | * system. Need to verify the device and if it is, then start handling it. | |
887 | */ | |
888 | static int mcs_probe(struct usb_interface *intf, | |
889 | const struct usb_device_id *id) | |
890 | { | |
891 | struct usb_device *udev = interface_to_usbdev(intf); | |
892 | struct net_device *ndev = NULL; | |
893 | struct mcs_cb *mcs; | |
894 | int ret = -ENOMEM; | |
895 | ||
896 | ndev = alloc_irdadev(sizeof(*mcs)); | |
897 | if (!ndev) | |
898 | goto error1; | |
899 | ||
900 | IRDA_DEBUG(1, "MCS7780 USB-IrDA bridge found at %d.", udev->devnum); | |
901 | ||
902 | /* what is it realy for? */ | |
903 | SET_MODULE_OWNER(ndev); | |
904 | SET_NETDEV_DEV(ndev, &intf->dev); | |
905 | ||
906 | ret = usb_reset_configuration(udev); | |
907 | if (ret != 0) { | |
908 | IRDA_ERROR("mcs7780: usb reset configuration failed"); | |
909 | goto error2; | |
910 | } | |
911 | ||
912 | mcs = netdev_priv(ndev); | |
913 | mcs->usbdev = udev; | |
914 | mcs->netdev = ndev; | |
915 | spin_lock_init(&mcs->lock); | |
916 | ||
917 | /* Initialize QoS for this device */ | |
918 | irda_init_max_qos_capabilies(&mcs->qos); | |
919 | ||
920 | /* That's the Rx capability. */ | |
921 | mcs->qos.baud_rate.bits &= | |
922 | IR_2400 | IR_9600 | IR_19200 | IR_38400 | IR_57600 | IR_115200 | |
923 | | IR_576000 | IR_1152000 | (IR_4000000 << 8); | |
924 | ||
925 | ||
926 | mcs->qos.min_turn_time.bits &= qos_mtt_bits; | |
927 | irda_qos_bits_to_value(&mcs->qos); | |
928 | ||
929 | /* Speed change work initialisation*/ | |
c4028958 | 930 | INIT_WORK(&mcs->work, mcs_speed_work); |
c6ae522e SO |
931 | |
932 | /* Override the network functions we need to use */ | |
933 | ndev->hard_start_xmit = mcs_hard_xmit; | |
934 | ndev->open = mcs_net_open; | |
935 | ndev->stop = mcs_net_close; | |
936 | ndev->get_stats = mcs_net_get_stats; | |
937 | ndev->do_ioctl = mcs_net_ioctl; | |
938 | ||
939 | if (!intf->cur_altsetting) | |
940 | goto error2; | |
941 | ||
942 | ret = mcs_find_endpoints(mcs, intf->cur_altsetting->endpoint, | |
943 | intf->cur_altsetting->desc.bNumEndpoints); | |
944 | if (!ret) { | |
945 | ret = -ENODEV; | |
946 | goto error2; | |
947 | } | |
948 | ||
949 | ret = register_netdev(ndev); | |
950 | if (ret != 0) | |
951 | goto error2; | |
952 | ||
953 | IRDA_DEBUG(1, "IrDA: Registered MosChip MCS7780 device as %s", | |
954 | ndev->name); | |
955 | ||
956 | mcs->transceiver_type = transceiver_type; | |
957 | mcs->sir_tweak = sir_tweak; | |
958 | mcs->receive_mode = receive_mode; | |
959 | ||
960 | usb_set_intfdata(intf, mcs); | |
961 | return 0; | |
962 | ||
963 | error2: | |
964 | free_netdev(ndev); | |
965 | ||
966 | error1: | |
967 | return ret; | |
968 | } | |
969 | ||
970 | /* The current device is removed, the USB layer tells us to shut down. */ | |
971 | static void mcs_disconnect(struct usb_interface *intf) | |
972 | { | |
973 | struct mcs_cb *mcs = usb_get_intfdata(intf); | |
974 | ||
975 | if (!mcs) | |
976 | return; | |
977 | ||
978 | flush_scheduled_work(); | |
979 | ||
980 | unregister_netdev(mcs->netdev); | |
981 | free_netdev(mcs->netdev); | |
982 | ||
983 | usb_set_intfdata(intf, NULL); | |
984 | IRDA_DEBUG(0, "MCS7780 now disconnected."); | |
985 | } | |
986 | ||
987 | /* Module insertion */ | |
988 | static int __init mcs_init(void) | |
989 | { | |
990 | int result; | |
991 | ||
992 | /* register this driver with the USB subsystem */ | |
993 | result = usb_register(&mcs_driver); | |
994 | if (result) | |
995 | IRDA_ERROR("usb_register failed. Error number %d", result); | |
996 | ||
997 | return result; | |
998 | } | |
999 | module_init(mcs_init); | |
1000 | ||
1001 | /* Module removal */ | |
1002 | static void __exit mcs_exit(void) | |
1003 | { | |
1004 | /* deregister this driver with the USB subsystem */ | |
1005 | usb_deregister(&mcs_driver); | |
1006 | } | |
1007 | module_exit(mcs_exit); | |
1008 |