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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> | |
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> | |
58 | #include <asm/uaccess.h> | |
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 | ||
69 | static 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 | ||
75 | MODULE_AUTHOR("Brian Pugh <bpugh@cs.pdx.edu>"); | |
76 | MODULE_DESCRIPTION("IrDA-USB Dongle Driver for MosChip MCS7780"); | |
77 | MODULE_VERSION("0.3alpha"); | |
78 | MODULE_LICENSE("GPL"); | |
79 | ||
80 | MODULE_DEVICE_TABLE(usb, mcs_table); | |
81 | ||
82 | static int qos_mtt_bits = 0x07 /* > 1ms */ ; | |
83 | module_param(qos_mtt_bits, int, 0); | |
84 | MODULE_PARM_DESC(qos_mtt_bits, "Minimum Turn Time"); | |
85 | ||
86 | static int receive_mode = 0x1; | |
87 | module_param(receive_mode, int, 0); | |
88 | MODULE_PARM_DESC(receive_mode, | |
89 | "Receive mode of the device (1:fast, 0:slow, default:1)"); | |
90 | ||
91 | static int sir_tweak = 1; | |
92 | module_param(sir_tweak, int, 0444); | |
93 | MODULE_PARM_DESC(sir_tweak, | |
94 | "Default pulse width (1:1.6us, 0:3/16 bit, default:1)."); | |
95 | ||
96 | static int transceiver_type = MCS_TSC_VISHAY; | |
97 | module_param(transceiver_type, int, 0444); | |
98 | MODULE_PARM_DESC(transceiver_type, "IR transceiver type, see mcs7780.h."); | |
99 | ||
7263ade1 | 100 | static 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. | |
108 | addr = (speed >> 8) & 0x0f | |
109 | ||
110 | 0x1 57600 0x2 115200 0x4 1152000 0x5 9600 | |
111 | 0x6 38400 0x9 2400 0xa 576000 0xb 19200 | |
112 | ||
113 | 4Mbps (or 2400) must be checked separately. Since it also has | |
114 | to be programmed in a different manner that is not a big problem. | |
115 | */ | |
116 | static __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. */ | |
132 | static 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. */ | |
141 | static 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 */ | |
158 | static 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 |
193 | error: |
194 | return ret; | |
c6ae522e SO |
195 | } |
196 | ||
197 | /* Setup a communication between mcs7780 and agilent chip. */ | |
198 | static 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. */ | |
205 | static 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 */ | |
212 | static 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 | ||
317 | error: | |
6c91023d | 318 | net_err_ratelimited("%s\n", msg); |
c6ae522e SO |
319 | return ret; |
320 | } | |
321 | ||
322 | /* Wraps the data in format for SIR */ | |
323 | static 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 */ | |
338 | static 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 */ | |
364 | static 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 | */ | |
390 | static 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 | */ | |
442 | static 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 | */ | |
495 | static 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 | */ | |
517 | static 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 */ | |
531 | static 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 | 560 | static 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 | */ | |
572 | static 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 |
649 | error: |
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. */ | |
655 | static 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" */ | |
670 | static 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" */ | |
695 | static 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 |
748 | error4: |
749 | usb_free_urb(mcs->rx_urb); | |
750 | usb_free_urb(mcs->tx_urb); | |
751 | error3: | |
752 | irlap_close(mcs->irlap); | |
753 | error2: | |
754 | kfree_skb(mcs->rx_buff.skb); | |
755 | error1: | |
756 | return ret; | |
c6ae522e SO |
757 | } |
758 | ||
c6ae522e | 759 | /* Receive callback function. */ |
7d12e780 | 760 | static 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 | 807 | static 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 |
819 | static 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 |
872 | static 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 | */ | |
883 | static 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 |
953 | error2: |
954 | free_netdev(ndev); | |
c6ae522e | 955 | |
89473129 AK |
956 | error1: |
957 | return ret; | |
c6ae522e SO |
958 | } |
959 | ||
960 | /* The current device is removed, the USB layer tells us to shut down. */ | |
961 | static 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 | 977 | module_usb_driver(mcs_driver); |