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iicsmb.c (38775) iicsmb.c (40782)
1/*-
2 * Copyright (c) 1998 Nicolas Souchu
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright

--- 9 unchanged lines hidden (view full) ---

18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 *
1/*-
2 * Copyright (c) 1998 Nicolas Souchu
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright

--- 9 unchanged lines hidden (view full) ---

18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 *
26 * $Id: iicsmb.c,v 1.1.2.2 1998/08/13 17:10:44 son Exp $
26 * $Id: iicsmb.c,v 1.1.1.1 1998/09/03 20:51:50 nsouch Exp $
27 *
28 */
29
30/*
31 * I2C to SMB bridge
27 *
28 */
29
30/*
31 * I2C to SMB bridge
32 *
33 * Example:
34 *
35 * smb bttv
36 * \ /
37 * smbus
38 * / \
39 * iicsmb bti2c
40 * |
41 * iicbus
42 * / | \
43 * iicbb pcf ...
44 * |
45 * lpbb
32 */
33
34#include <sys/param.h>
35#include <sys/kernel.h>
36#include <sys/systm.h>
37#include <sys/module.h>
38#include <sys/bus.h>
39#include <sys/conf.h>

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67 device_t smbus;
68};
69
70static int iicsmb_probe(device_t);
71static int iicsmb_attach(device_t);
72static void iicsmb_print_child(device_t, device_t);
73
74static void iicsmb_intr(device_t dev, int event, char *buf);
46 */
47
48#include <sys/param.h>
49#include <sys/kernel.h>
50#include <sys/systm.h>
51#include <sys/module.h>
52#include <sys/bus.h>
53#include <sys/conf.h>

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81 device_t smbus;
82};
83
84static int iicsmb_probe(device_t);
85static int iicsmb_attach(device_t);
86static void iicsmb_print_child(device_t, device_t);
87
88static void iicsmb_intr(device_t dev, int event, char *buf);
89static int iicsmb_callback(device_t dev, int index, caddr_t data);
75static int iicsmb_quick(device_t dev, u_char slave, int how);
76static int iicsmb_sendb(device_t dev, u_char slave, char byte);
77static int iicsmb_recvb(device_t dev, u_char slave, char *byte);
78static int iicsmb_writeb(device_t dev, u_char slave, char cmd, char byte);
79static int iicsmb_writew(device_t dev, u_char slave, char cmd, short word);
80static int iicsmb_readb(device_t dev, u_char slave, char cmd, char *byte);
81static int iicsmb_readw(device_t dev, u_char slave, char cmd, short *word);
82static int iicsmb_pcall(device_t dev, u_char slave, char cmd, short sdata, short *rdata);

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92
93 /* bus interface */
94 DEVMETHOD(bus_print_child, iicsmb_print_child),
95
96 /* iicbus interface */
97 DEVMETHOD(iicbus_intr, iicsmb_intr),
98
99 /* smbus interface */
90static int iicsmb_quick(device_t dev, u_char slave, int how);
91static int iicsmb_sendb(device_t dev, u_char slave, char byte);
92static int iicsmb_recvb(device_t dev, u_char slave, char *byte);
93static int iicsmb_writeb(device_t dev, u_char slave, char cmd, char byte);
94static int iicsmb_writew(device_t dev, u_char slave, char cmd, short word);
95static int iicsmb_readb(device_t dev, u_char slave, char cmd, char *byte);
96static int iicsmb_readw(device_t dev, u_char slave, char cmd, short *word);
97static int iicsmb_pcall(device_t dev, u_char slave, char cmd, short sdata, short *rdata);

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107
108 /* bus interface */
109 DEVMETHOD(bus_print_child, iicsmb_print_child),
110
111 /* iicbus interface */
112 DEVMETHOD(iicbus_intr, iicsmb_intr),
113
114 /* smbus interface */
115 DEVMETHOD(smbus_callback, iicsmb_callback),
100 DEVMETHOD(smbus_quick, iicsmb_quick),
101 DEVMETHOD(smbus_sendb, iicsmb_sendb),
102 DEVMETHOD(smbus_recvb, iicsmb_recvb),
103 DEVMETHOD(smbus_writeb, iicsmb_writeb),
104 DEVMETHOD(smbus_writew, iicsmb_writew),
105 DEVMETHOD(smbus_readb, iicsmb_readb),
106 DEVMETHOD(smbus_readw, iicsmb_readw),
107 DEVMETHOD(smbus_pcall, iicsmb_pcall),

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218 default:
219 panic("%s: unknown event (%d)!", __FUNCTION__, event);
220 }
221
222 return;
223}
224
225static int
116 DEVMETHOD(smbus_quick, iicsmb_quick),
117 DEVMETHOD(smbus_sendb, iicsmb_sendb),
118 DEVMETHOD(smbus_recvb, iicsmb_recvb),
119 DEVMETHOD(smbus_writeb, iicsmb_writeb),
120 DEVMETHOD(smbus_writew, iicsmb_writew),
121 DEVMETHOD(smbus_readb, iicsmb_readb),
122 DEVMETHOD(smbus_readw, iicsmb_readw),
123 DEVMETHOD(smbus_pcall, iicsmb_pcall),

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234 default:
235 panic("%s: unknown event (%d)!", __FUNCTION__, event);
236 }
237
238 return;
239}
240
241static int
242iicsmb_callback(device_t dev, int index, caddr_t data)
243{
244 device_t parent = device_get_parent(dev);
245 int error = 0;
246 int how;
247
248 switch (index) {
249 case SMB_REQUEST_BUS:
250 /* request underlying iicbus */
251 how = *(int *)data;
252 error = iicbus_request_bus(parent, dev, how);
253 break;
254
255 case SMB_RELEASE_BUS:
256 /* release underlying iicbus */
257 error = iicbus_release_bus(parent, dev);
258 break;
259
260 default:
261 error = EINVAL;
262 }
263
264 return (error);
265}
266
267static int
226iicsmb_quick(device_t dev, u_char slave, int how)
227{
228 device_t parent = device_get_parent(dev);
229 int error;
230
231 switch (how) {
232 case SMB_QWRITE:
268iicsmb_quick(device_t dev, u_char slave, int how)
269{
270 device_t parent = device_get_parent(dev);
271 int error;
272
273 switch (how) {
274 case SMB_QWRITE:
233 error = iicbus_start(parent, slave & ~LSB);
275 error = iicbus_start(parent, slave & ~LSB, 0);
234 break;
235
236 case SMB_QREAD:
276 break;
277
278 case SMB_QREAD:
237 error = iicbus_start(parent, slave | LSB);
279 error = iicbus_start(parent, slave | LSB, 0);
238 break;
239
240 default:
241 error = EINVAL;
242 break;
243 }
244
245 if (!error)
246 error = iicbus_stop(parent);
247
248 return (error);
249}
250
251static int
252iicsmb_sendb(device_t dev, u_char slave, char byte)
253{
254 device_t parent = device_get_parent(dev);
255 int error, sent;
256
280 break;
281
282 default:
283 error = EINVAL;
284 break;
285 }
286
287 if (!error)
288 error = iicbus_stop(parent);
289
290 return (error);
291}
292
293static int
294iicsmb_sendb(device_t dev, u_char slave, char byte)
295{
296 device_t parent = device_get_parent(dev);
297 int error, sent;
298
257 error = iicbus_start(parent, slave & ~LSB);
299 error = iicbus_start(parent, slave & ~LSB, 0);
258
259 if (!error) {
300
301 if (!error) {
260 error = iicbus_write(parent, &byte, 1, &sent);
302 error = iicbus_write(parent, &byte, 1, &sent, 0);
261
262 iicbus_stop(parent);
263 }
264
265 return (error);
266}
267
268static int
269iicsmb_recvb(device_t dev, u_char slave, char *byte)
270{
271 device_t parent = device_get_parent(dev);
272 int error, read;
273
303
304 iicbus_stop(parent);
305 }
306
307 return (error);
308}
309
310static int
311iicsmb_recvb(device_t dev, u_char slave, char *byte)
312{
313 device_t parent = device_get_parent(dev);
314 int error, read;
315
274 error = iicbus_start(parent, slave | LSB);
316 error = iicbus_start(parent, slave | LSB, 0);
275
317
276 if (!error)
277 error = iicbus_read(parent, byte, 1, &read);
318 if (!error) {
319 error = iicbus_read(parent, byte, 1, &read, IIC_LAST_READ, 0);
278
320
321 iicbus_stop(parent);
322 }
323
279 return (error);
280}
281
282static int
283iicsmb_writeb(device_t dev, u_char slave, char cmd, char byte)
284{
285 device_t parent = device_get_parent(dev);
286 int error, sent;
287
324 return (error);
325}
326
327static int
328iicsmb_writeb(device_t dev, u_char slave, char cmd, char byte)
329{
330 device_t parent = device_get_parent(dev);
331 int error, sent;
332
288 error = iicbus_start(parent, slave & ~LSB);
333 error = iicbus_start(parent, slave & ~LSB, 0);
289
290 if (!error) {
334
335 if (!error) {
291 if (!(error = iicbus_write(parent, &cmd, 1, &sent)))
292 error = iicbus_write(parent, &byte, 1, &sent);
336 if (!(error = iicbus_write(parent, &cmd, 1, &sent, 0)))
337 error = iicbus_write(parent, &byte, 1, &sent, 0);
293
294 iicbus_stop(parent);
295 }
296
297 return (error);
298}
299
300static int
301iicsmb_writew(device_t dev, u_char slave, char cmd, short word)
302{
303 device_t parent = device_get_parent(dev);
304 int error, sent;
305
306 char low = (char)(word & 0xff);
307 char high = (char)((word & 0xff00) >> 8);
308
338
339 iicbus_stop(parent);
340 }
341
342 return (error);
343}
344
345static int
346iicsmb_writew(device_t dev, u_char slave, char cmd, short word)
347{
348 device_t parent = device_get_parent(dev);
349 int error, sent;
350
351 char low = (char)(word & 0xff);
352 char high = (char)((word & 0xff00) >> 8);
353
309 error = iicbus_start(parent, slave & ~LSB);
354 error = iicbus_start(parent, slave & ~LSB, 0);
310
311 if (!error) {
355
356 if (!error) {
312 if (!(error = iicbus_write(parent, &cmd, 1, &sent)))
313 if (!(error = iicbus_write(parent, &low, 1, &sent)))
314 error = iicbus_write(parent, &high, 1, &sent);
357 if (!(error = iicbus_write(parent, &cmd, 1, &sent, 0)))
358 if (!(error = iicbus_write(parent, &low, 1, &sent, 0)))
359 error = iicbus_write(parent, &high, 1, &sent, 0);
315
316 iicbus_stop(parent);
317 }
318
319 return (error);
320}
321
322static int
323iicsmb_readb(device_t dev, u_char slave, char cmd, char *byte)
324{
325 device_t parent = device_get_parent(dev);
326 int error, sent, read;
327
360
361 iicbus_stop(parent);
362 }
363
364 return (error);
365}
366
367static int
368iicsmb_readb(device_t dev, u_char slave, char cmd, char *byte)
369{
370 device_t parent = device_get_parent(dev);
371 int error, sent, read;
372
328 if ((error = iicbus_start(parent, slave & ~LSB)))
329 goto error;
373 if ((error = iicbus_start(parent, slave & ~LSB, 0)))
374 return (error);
330
375
331 if ((error = iicbus_write(parent, &cmd, 1, &sent)))
376 if ((error = iicbus_write(parent, &cmd, 1, &sent, 0)))
332 goto error;
333
377 goto error;
378
334 if ((error = iicbus_repeated_start(parent, slave | LSB)))
379 if ((error = iicbus_repeated_start(parent, slave | LSB, 0)))
335 goto error;
336
380 goto error;
381
337 if ((error = iicbus_read(parent, byte, 1, &read)))
382 if ((error = iicbus_read(parent, byte, 1, &read, IIC_LAST_READ, 0)))
338 goto error;
339
340error:
383 goto error;
384
385error:
386 iicbus_stop(parent);
341 return (error);
342}
343
344#define BUF2SHORT(low,high) \
345 ((short)(((high) & 0xff) << 8) | (short)((low) & 0xff))
346
347static int
348iicsmb_readw(device_t dev, u_char slave, char cmd, short *word)
349{
350 device_t parent = device_get_parent(dev);
351 int error, sent, read;
352 char buf[2];
353
387 return (error);
388}
389
390#define BUF2SHORT(low,high) \
391 ((short)(((high) & 0xff) << 8) | (short)((low) & 0xff))
392
393static int
394iicsmb_readw(device_t dev, u_char slave, char cmd, short *word)
395{
396 device_t parent = device_get_parent(dev);
397 int error, sent, read;
398 char buf[2];
399
354 if ((error = iicbus_start(parent, slave & ~LSB)))
355 goto error;
400 if ((error = iicbus_start(parent, slave & ~LSB, 0)))
401 return (error);
356
402
357 if ((error = iicbus_write(parent, &cmd, 1, &sent)))
403 if ((error = iicbus_write(parent, &cmd, 1, &sent, 0)))
358 goto error;
359
404 goto error;
405
360 if ((error = iicbus_repeated_start(parent, slave | LSB)))
406 if ((error = iicbus_repeated_start(parent, slave | LSB, 0)))
361 goto error;
362
407 goto error;
408
363 if ((error = iicbus_read(parent, buf, 2, &read)))
409 if ((error = iicbus_read(parent, buf, 2, &read, IIC_LAST_READ, 0)))
364 goto error;
365
366 /* first, receive low, then high byte */
367 *word = BUF2SHORT(buf[0], buf[1]);
368
369error:
410 goto error;
411
412 /* first, receive low, then high byte */
413 *word = BUF2SHORT(buf[0], buf[1]);
414
415error:
416 iicbus_stop(parent);
370 return (error);
371}
372
373static int
374iicsmb_pcall(device_t dev, u_char slave, char cmd, short sdata, short *rdata)
375{
376 device_t parent = device_get_parent(dev);
377 int error, sent, read;
378 char buf[2];
379
417 return (error);
418}
419
420static int
421iicsmb_pcall(device_t dev, u_char slave, char cmd, short sdata, short *rdata)
422{
423 device_t parent = device_get_parent(dev);
424 int error, sent, read;
425 char buf[2];
426
380 if ((error = iicbus_start(parent, slave & ~LSB)))
381 goto error;
427 if ((error = iicbus_start(parent, slave & ~LSB, 0)))
428 return (error);
382
429
383 if ((error = iicbus_write(parent, &cmd, 1, &sent)))
430 if ((error = iicbus_write(parent, &cmd, 1, &sent, 0)))
384 goto error;
385
386 /* first, send low, then high byte */
387 buf[0] = (char)(sdata & 0xff);
388 buf[1] = (char)((sdata & 0xff00) >> 8);
389
431 goto error;
432
433 /* first, send low, then high byte */
434 buf[0] = (char)(sdata & 0xff);
435 buf[1] = (char)((sdata & 0xff00) >> 8);
436
390 if ((error = iicbus_write(parent, buf, 2, &sent)))
437 if ((error = iicbus_write(parent, buf, 2, &sent, 0)))
391 goto error;
392
438 goto error;
439
393 if ((error = iicbus_repeated_start(parent, slave | LSB)))
440 if ((error = iicbus_repeated_start(parent, slave | LSB, 0)))
394 goto error;
395
441 goto error;
442
396 if ((error = iicbus_read(parent, buf, 2, &read)))
443 if ((error = iicbus_read(parent, buf, 2, &read, IIC_LAST_READ, 0)))
397 goto error;
398
399 /* first, receive low, then high byte */
400 *rdata = BUF2SHORT(buf[0], buf[1]);
401
402error:
444 goto error;
445
446 /* first, receive low, then high byte */
447 *rdata = BUF2SHORT(buf[0], buf[1]);
448
449error:
450 iicbus_stop(parent);
403 return (error);
404}
405
406static int
407iicsmb_bwrite(device_t dev, u_char slave, char cmd, u_char count, char *buf)
408{
409 device_t parent = device_get_parent(dev);
410 int error, sent;
411
451 return (error);
452}
453
454static int
455iicsmb_bwrite(device_t dev, u_char slave, char cmd, u_char count, char *buf)
456{
457 device_t parent = device_get_parent(dev);
458 int error, sent;
459
412 if ((error = iicbus_start(parent, slave & ~LSB)))
460 if ((error = iicbus_start(parent, slave & ~LSB, 0)))
413 goto error;
414
461 goto error;
462
415 if ((error = iicbus_write(parent, &cmd, 1, &sent)))
463 if ((error = iicbus_write(parent, &cmd, 1, &sent, 0)))
416 goto error;
417
464 goto error;
465
418 if ((error = iicbus_write(parent, buf, (int)count, &sent)))
466 if ((error = iicbus_write(parent, buf, (int)count, &sent, 0)))
419 goto error;
420
421 if ((error = iicbus_stop(parent)))
422 goto error;
423
424error:
425 return (error);
426}
427
428static int
429iicsmb_bread(device_t dev, u_char slave, char cmd, u_char count, char *buf)
430{
431 device_t parent = device_get_parent(dev);
432 int error, sent, read;
433
467 goto error;
468
469 if ((error = iicbus_stop(parent)))
470 goto error;
471
472error:
473 return (error);
474}
475
476static int
477iicsmb_bread(device_t dev, u_char slave, char cmd, u_char count, char *buf)
478{
479 device_t parent = device_get_parent(dev);
480 int error, sent, read;
481
434 if ((error = iicbus_start(parent, slave & ~LSB)))
435 goto error;
482 if ((error = iicbus_start(parent, slave & ~LSB, 0)))
483 return (error);
436
484
437 if ((error = iicbus_write(parent, &cmd, 1, &sent)))
485 if ((error = iicbus_write(parent, &cmd, 1, &sent, 0)))
438 goto error;
439
486 goto error;
487
440 if ((error = iicbus_repeated_start(parent, slave | LSB)))
488 if ((error = iicbus_repeated_start(parent, slave | LSB, 0)))
441 goto error;
442
489 goto error;
490
443 if ((error = iicbus_read(parent, buf, (int)count, &read)))
491 if ((error = iicbus_read(parent, buf, (int)count, &read,
492 IIC_LAST_READ, 0)))
444 goto error;
445
446error:
493 goto error;
494
495error:
496 iicbus_stop(parent);
447 return (error);
448}
449
450DRIVER_MODULE(iicsmb, iicbus, iicsmb_driver, iicsmb_devclass, 0, 0);
497 return (error);
498}
499
500DRIVER_MODULE(iicsmb, iicbus, iicsmb_driver, iicsmb_devclass, 0, 0);