1 | /* $Id$ */ |
---|
2 | |
---|
3 | /* libi2c Implementation */ |
---|
4 | |
---|
5 | #include <string.h> |
---|
6 | #include <stdio.h> |
---|
7 | #include <stdlib.h> |
---|
8 | #include <errno.h> |
---|
9 | #include <assert.h> |
---|
10 | |
---|
11 | #include <rtems.h> |
---|
12 | #include <rtems/error.h> |
---|
13 | #include <rtems/libio.h> |
---|
14 | |
---|
15 | #include <rtems/libi2c.h> |
---|
16 | |
---|
17 | #define DRVNM "libi2c:" |
---|
18 | |
---|
19 | #define MAX_NO_BUSSES 8 /* Also limited by the macro building minor numbers */ |
---|
20 | #define MAX_NO_DRIVERS 16 /* Number of high level drivers we support */ |
---|
21 | |
---|
22 | #define MINOR2ADDR(minor) ((minor)&((1<<10)-1)) |
---|
23 | #define MINOR2BUS(minor) (((minor)>>10)&7) |
---|
24 | #define MINOR2DRV(minor) ((minor)>>13) |
---|
25 | |
---|
26 | /* Check the 'minor' argument, i.e., verify that |
---|
27 | * we have a driver connected |
---|
28 | */ |
---|
29 | #define DECL_CHECKED_BH(b, bh, m, s)\ |
---|
30 | unsigned b = MINOR2BUS(m); \ |
---|
31 | rtems_libi2c_bus_t *bh; \ |
---|
32 | if ( b >= MAX_NO_BUSSES || 0 == (bh=busses[b].bush) ) { \ |
---|
33 | return s RTEMS_INVALID_NUMBER; \ |
---|
34 | } |
---|
35 | |
---|
36 | #define DECL_CHECKED_DRV(d, b, m) \ |
---|
37 | unsigned d = MINOR2DRV(m); \ |
---|
38 | unsigned b = MINOR2BUS(m); \ |
---|
39 | if ( b >= MAX_NO_BUSSES || 0 == busses[b].bush \ |
---|
40 | || d > MAX_NO_DRIVERS || (d && 0 == drvs[d-1].drv )) {\ |
---|
41 | return RTEMS_INVALID_NUMBER; \ |
---|
42 | } |
---|
43 | |
---|
44 | #define DISPATCH(rval, entry, dflt) \ |
---|
45 | do { \ |
---|
46 | rtems_driver_address_table *ops = drvs[--drv].drv->ops; \ |
---|
47 | rval = ops->entry ? ops->entry(major,minor,arg) : dflt; \ |
---|
48 | } while (0) |
---|
49 | |
---|
50 | |
---|
51 | rtems_device_major_number rtems_libi2c_major; |
---|
52 | |
---|
53 | static struct i2cbus |
---|
54 | { |
---|
55 | rtems_libi2c_bus_t *bush; |
---|
56 | volatile rtems_id mutex; /* lock this across start -> stop */ |
---|
57 | volatile short waiting; |
---|
58 | volatile char started; |
---|
59 | char *name; |
---|
60 | } busses[MAX_NO_BUSSES] = { { 0 } }; |
---|
61 | |
---|
62 | static struct |
---|
63 | { |
---|
64 | rtems_libi2c_drv_t *drv; |
---|
65 | } drvs[MAX_NO_DRIVERS] = { { 0} }; |
---|
66 | |
---|
67 | static rtems_id libmutex = 0; |
---|
68 | |
---|
69 | #define LOCK(m) assert(!rtems_semaphore_obtain((m), RTEMS_WAIT, RTEMS_NO_TIMEOUT)) |
---|
70 | #define UNLOCK(m) rtems_semaphore_release((m)) |
---|
71 | |
---|
72 | #define LIBLOCK() LOCK(libmutex) |
---|
73 | #define LIBUNLOCK() UNLOCK(libmutex) |
---|
74 | |
---|
75 | #define MUTEX_ATTS \ |
---|
76 | ( RTEMS_PRIORITY \ |
---|
77 | | RTEMS_BINARY_SEMAPHORE \ |
---|
78 | |RTEMS_INHERIT_PRIORITY \ |
---|
79 | |RTEMS_NO_PRIORITY_CEILING \ |
---|
80 | |RTEMS_LOCAL ) |
---|
81 | |
---|
82 | static rtems_id |
---|
83 | mutexCreate (rtems_name nm) |
---|
84 | { |
---|
85 | rtems_status_code sc; |
---|
86 | rtems_id rval; |
---|
87 | if (RTEMS_SUCCESSFUL != |
---|
88 | (sc = rtems_semaphore_create (nm, 1, MUTEX_ATTS, 0, &rval))) { |
---|
89 | rtems_error (sc, DRVNM " unable to create mutex\n"); |
---|
90 | return 0; |
---|
91 | } |
---|
92 | return rval; |
---|
93 | } |
---|
94 | |
---|
95 | /* Lock a bus avoiding to have a mutex, which is mostly |
---|
96 | * unused, hanging around all the time. We just create |
---|
97 | * and delete it on the fly... |
---|
98 | * |
---|
99 | * ASSUMES: argument checked by caller |
---|
100 | */ |
---|
101 | |
---|
102 | static void |
---|
103 | lock_bus (int busno) |
---|
104 | { |
---|
105 | struct i2cbus *bus = &busses[busno]; |
---|
106 | LIBLOCK (); |
---|
107 | if (!bus->waiting) { |
---|
108 | /* nobody is holding the bus mutex - it's not there. Create it on the fly */ |
---|
109 | if (! |
---|
110 | (bus->mutex = |
---|
111 | mutexCreate (rtems_build_name ('i', '2', 'c', '0' + busno)))) { |
---|
112 | LIBUNLOCK (); |
---|
113 | rtems_panic (DRVNM " unable to create bus lock"); |
---|
114 | } |
---|
115 | } |
---|
116 | /* count number of people waiting on this bus; only the last one deletes the mutex */ |
---|
117 | bus->waiting++; |
---|
118 | LIBUNLOCK (); |
---|
119 | /* Now lock this bus */ |
---|
120 | LOCK (bus->mutex); |
---|
121 | } |
---|
122 | |
---|
123 | static void |
---|
124 | unlock_bus (int busno) |
---|
125 | { |
---|
126 | struct i2cbus *bus = &busses[busno]; |
---|
127 | LIBLOCK (); |
---|
128 | UNLOCK (bus->mutex); |
---|
129 | if (!--bus->waiting) { |
---|
130 | rtems_semaphore_delete (bus->mutex); |
---|
131 | } |
---|
132 | LIBUNLOCK (); |
---|
133 | } |
---|
134 | |
---|
135 | /* Note that 'arg' is always passed in as NULL */ |
---|
136 | static rtems_status_code |
---|
137 | i2c_init (rtems_device_major_number major, rtems_device_minor_number minor, |
---|
138 | void *arg) |
---|
139 | { |
---|
140 | rtems_status_code rval; |
---|
141 | DECL_CHECKED_DRV (drv, busno, minor) |
---|
142 | |
---|
143 | if (0 == drv) { |
---|
144 | rval = 0; |
---|
145 | } else { |
---|
146 | /* this is probably never called */ |
---|
147 | DISPATCH (rval, initialization_entry, RTEMS_SUCCESSFUL); |
---|
148 | } |
---|
149 | return rval; |
---|
150 | } |
---|
151 | |
---|
152 | static rtems_status_code |
---|
153 | i2c_open (rtems_device_major_number major, rtems_device_minor_number minor, |
---|
154 | void *arg) |
---|
155 | { |
---|
156 | rtems_status_code rval; |
---|
157 | DECL_CHECKED_DRV (drv, busno, minor) |
---|
158 | |
---|
159 | if (0 == drv) { |
---|
160 | rval = RTEMS_SUCCESSFUL; |
---|
161 | } else { |
---|
162 | DISPATCH (rval, open_entry, RTEMS_SUCCESSFUL); |
---|
163 | } |
---|
164 | return rval; |
---|
165 | } |
---|
166 | |
---|
167 | static rtems_status_code |
---|
168 | i2c_close (rtems_device_major_number major, rtems_device_minor_number minor, |
---|
169 | void *arg) |
---|
170 | { |
---|
171 | rtems_status_code rval; |
---|
172 | DECL_CHECKED_DRV (drv, busno, minor) |
---|
173 | |
---|
174 | if (0 == drv) { |
---|
175 | rval = RTEMS_SUCCESSFUL; |
---|
176 | } else { |
---|
177 | DISPATCH (rval, close_entry, RTEMS_SUCCESSFUL); |
---|
178 | } |
---|
179 | return rval; |
---|
180 | } |
---|
181 | |
---|
182 | static rtems_status_code |
---|
183 | i2c_read (rtems_device_major_number major, rtems_device_minor_number minor, |
---|
184 | void *arg) |
---|
185 | { |
---|
186 | int rval; /* int so we can check for negative value */ |
---|
187 | rtems_libio_rw_args_t *rwargs = arg; |
---|
188 | DECL_CHECKED_DRV (drv, busno, minor) |
---|
189 | |
---|
190 | if (0 == rwargs->count) { |
---|
191 | rwargs->bytes_moved = 0; |
---|
192 | return RTEMS_SUCCESSFUL; |
---|
193 | } |
---|
194 | |
---|
195 | if (0 == drv) { |
---|
196 | rval = |
---|
197 | rtems_libi2c_start_read_bytes (minor, (unsigned char *) rwargs->buffer, |
---|
198 | rwargs->count); |
---|
199 | if (rval >= 0) { |
---|
200 | rwargs->bytes_moved = rval; |
---|
201 | rtems_libi2c_send_stop (minor); |
---|
202 | rval = RTEMS_SUCCESSFUL; |
---|
203 | } else { |
---|
204 | rval = -rval; |
---|
205 | } |
---|
206 | } else { |
---|
207 | DISPATCH (rval, read_entry, RTEMS_NOT_IMPLEMENTED); |
---|
208 | } |
---|
209 | return rval; |
---|
210 | } |
---|
211 | |
---|
212 | static rtems_status_code |
---|
213 | i2c_write (rtems_device_major_number major, rtems_device_minor_number minor, |
---|
214 | void *arg) |
---|
215 | { |
---|
216 | int rval; /* int so we can check for negative value */ |
---|
217 | rtems_libio_rw_args_t *rwargs = arg; |
---|
218 | DECL_CHECKED_DRV (drv, busno, minor) |
---|
219 | |
---|
220 | if (0 == rwargs->count) { |
---|
221 | rwargs->bytes_moved = 0; |
---|
222 | return RTEMS_SUCCESSFUL; |
---|
223 | } |
---|
224 | |
---|
225 | if (0 == drv) { |
---|
226 | rval = |
---|
227 | rtems_libi2c_start_write_bytes (minor, (unsigned char *) rwargs->buffer, |
---|
228 | rwargs->count); |
---|
229 | if (rval >= 0) { |
---|
230 | rwargs->bytes_moved = rval; |
---|
231 | rtems_libi2c_send_stop (minor); |
---|
232 | rval = RTEMS_SUCCESSFUL; |
---|
233 | } else { |
---|
234 | rval = -rval; |
---|
235 | } |
---|
236 | } else { |
---|
237 | DISPATCH (rval, write_entry, RTEMS_NOT_IMPLEMENTED); |
---|
238 | } |
---|
239 | return rval; |
---|
240 | } |
---|
241 | |
---|
242 | static rtems_status_code |
---|
243 | i2c_ioctl (rtems_device_major_number major, rtems_device_minor_number minor, |
---|
244 | void *arg) |
---|
245 | { |
---|
246 | rtems_status_code rval; |
---|
247 | DECL_CHECKED_DRV (drv, busno, minor) |
---|
248 | |
---|
249 | if (0 == drv) { |
---|
250 | rval = RTEMS_NOT_IMPLEMENTED; |
---|
251 | } else { |
---|
252 | DISPATCH (rval, control_entry, RTEMS_NOT_IMPLEMENTED); |
---|
253 | } |
---|
254 | return rval; |
---|
255 | } |
---|
256 | |
---|
257 | |
---|
258 | /* Our ops just dispatch to the registered drivers */ |
---|
259 | static rtems_driver_address_table libi2c_io_ops = { |
---|
260 | initialization_entry: i2c_init, |
---|
261 | open_entry: i2c_open, |
---|
262 | close_entry: i2c_close, |
---|
263 | read_entry: i2c_read, |
---|
264 | write_entry: i2c_write, |
---|
265 | control_entry: i2c_ioctl, |
---|
266 | }; |
---|
267 | |
---|
268 | |
---|
269 | int |
---|
270 | rtems_libi2c_initialize () |
---|
271 | { |
---|
272 | rtems_status_code sc; |
---|
273 | |
---|
274 | if (!(libmutex = mutexCreate (rtems_build_name ('l', 'I', '2', 'C')))) |
---|
275 | return -1; |
---|
276 | |
---|
277 | sc = rtems_io_register_driver (0, &libi2c_io_ops, &rtems_libi2c_major); |
---|
278 | if (RTEMS_SUCCESSFUL != 0) { |
---|
279 | fprintf (stderr, |
---|
280 | DRVNM " Claiming driver slot failed (rtems status code %i)\n", |
---|
281 | sc); |
---|
282 | rtems_semaphore_delete (libmutex); |
---|
283 | libmutex = 0; |
---|
284 | return -1; |
---|
285 | } |
---|
286 | |
---|
287 | return 0; |
---|
288 | } |
---|
289 | |
---|
290 | int |
---|
291 | rtems_libi2c_register_bus (char *name, rtems_libi2c_bus_t * bus) |
---|
292 | { |
---|
293 | int i; |
---|
294 | rtems_status_code err; |
---|
295 | char *nmcpy = malloc (name ? strlen (name) + 1 : 20); |
---|
296 | char tmp, *chpt; |
---|
297 | struct stat sbuf; |
---|
298 | |
---|
299 | strcpy (nmcpy, name ? name : "/dev/i2c"); |
---|
300 | |
---|
301 | |
---|
302 | /* check */ |
---|
303 | if ('/' != *nmcpy) { |
---|
304 | fprintf (stderr, |
---|
305 | "Bad name; must be an absolute path starting with '/'\n"); |
---|
306 | return -RTEMS_INVALID_NAME; |
---|
307 | } |
---|
308 | /* file must not exist */ |
---|
309 | if (!stat (nmcpy, &sbuf)) { |
---|
310 | fprintf (stderr, "Bad name; file exists already\n"); |
---|
311 | return -RTEMS_INVALID_NAME; |
---|
312 | } |
---|
313 | |
---|
314 | /* we already verified that there is at least one '/' */ |
---|
315 | chpt = strrchr (nmcpy, '/') + 1; |
---|
316 | tmp = *chpt; |
---|
317 | *chpt = 0; |
---|
318 | i = stat (nmcpy, &sbuf); |
---|
319 | *chpt = tmp; |
---|
320 | if (i) { |
---|
321 | fprintf (stderr, "Bad name '%s'; parent directory doesn't exist\n", |
---|
322 | nmcpy); |
---|
323 | return -RTEMS_INVALID_NAME; |
---|
324 | } |
---|
325 | /* should be a directory since name terminates in '/' */ |
---|
326 | |
---|
327 | |
---|
328 | if (!libmutex) { |
---|
329 | fprintf (stderr, DRVNM " library not initialized\n"); |
---|
330 | return -RTEMS_NOT_DEFINED; |
---|
331 | } |
---|
332 | |
---|
333 | if (bus->size < sizeof (*bus)) { |
---|
334 | fprintf (stderr, DRVNM " bus-ops size too small -- misconfiguration?\n"); |
---|
335 | return -RTEMS_NOT_CONFIGURED; |
---|
336 | } |
---|
337 | |
---|
338 | LIBLOCK (); |
---|
339 | for (i = 0; i < MAX_NO_BUSSES; i++) { |
---|
340 | if (!busses[i].bush) { |
---|
341 | /* found a free slot */ |
---|
342 | busses[i].bush = bus; |
---|
343 | busses[i].mutex = 0; |
---|
344 | busses[i].waiting = 0; |
---|
345 | busses[i].started = 0; |
---|
346 | |
---|
347 | if (!name) |
---|
348 | sprintf (nmcpy + strlen (nmcpy), "%i", i); |
---|
349 | |
---|
350 | if ((err = busses[i].bush->ops->init (busses[i].bush))) { |
---|
351 | /* initialization failed */ |
---|
352 | i = -err; |
---|
353 | } else { |
---|
354 | busses[i].name = nmcpy;; |
---|
355 | nmcpy = 0; |
---|
356 | } |
---|
357 | |
---|
358 | break; |
---|
359 | } |
---|
360 | } |
---|
361 | LIBUNLOCK (); |
---|
362 | |
---|
363 | if (i >= MAX_NO_BUSSES) { |
---|
364 | i = -RTEMS_TOO_MANY; |
---|
365 | } |
---|
366 | |
---|
367 | free (nmcpy); |
---|
368 | |
---|
369 | return i; |
---|
370 | } |
---|
371 | |
---|
372 | static int |
---|
373 | not_started (int busno) |
---|
374 | { |
---|
375 | int rval; |
---|
376 | lock_bus (busno); |
---|
377 | rval = !busses[busno].started; |
---|
378 | unlock_bus (busno); |
---|
379 | return rval; |
---|
380 | } |
---|
381 | |
---|
382 | rtems_status_code |
---|
383 | rtems_libi2c_send_start (unsigned32 minor) |
---|
384 | { |
---|
385 | int rval; |
---|
386 | DECL_CHECKED_BH (busno, bush, minor, +) |
---|
387 | |
---|
388 | lock_bus (busno); |
---|
389 | rval = bush->ops->send_start (bush); |
---|
390 | |
---|
391 | /* if this failed or is not the first start, unlock */ |
---|
392 | if (rval || busses[busno].started) { |
---|
393 | /* HMM - what to do if the 1st start failed ? |
---|
394 | * try to reset... |
---|
395 | */ |
---|
396 | if (!busses[busno].started) { |
---|
397 | /* just in case the bus driver fiddles with errno */ |
---|
398 | int errno_saved = errno; |
---|
399 | bush->ops->init (bush); |
---|
400 | errno = errno_saved; |
---|
401 | } else if (rval) { |
---|
402 | /* failed restart */ |
---|
403 | rtems_libi2c_send_stop (minor); |
---|
404 | } |
---|
405 | unlock_bus (busno); |
---|
406 | } else { |
---|
407 | /* successful 1st start; keep bus locked until stop is sent */ |
---|
408 | busses[busno].started = 1; |
---|
409 | } |
---|
410 | return rval; |
---|
411 | } |
---|
412 | |
---|
413 | rtems_status_code |
---|
414 | rtems_libi2c_send_stop (unsigned32 minor) |
---|
415 | { |
---|
416 | rtems_status_code rval; |
---|
417 | DECL_CHECKED_BH (busno, bush, minor, +) |
---|
418 | |
---|
419 | if (not_started (busno)) |
---|
420 | return RTEMS_NOT_OWNER_OF_RESOURCE; |
---|
421 | |
---|
422 | rval = bush->ops->send_stop (bush); |
---|
423 | |
---|
424 | busses[busno].started = 0; |
---|
425 | |
---|
426 | unlock_bus (busno); |
---|
427 | return rval; |
---|
428 | } |
---|
429 | |
---|
430 | rtems_status_code |
---|
431 | rtems_libi2c_send_addr (unsigned32 minor, int rw) |
---|
432 | { |
---|
433 | rtems_status_code sc; |
---|
434 | DECL_CHECKED_BH (busno, bush, minor, +) |
---|
435 | |
---|
436 | if (not_started (busno)) |
---|
437 | return RTEMS_NOT_OWNER_OF_RESOURCE; |
---|
438 | |
---|
439 | sc = bush->ops->send_addr (bush, MINOR2ADDR (minor), rw); |
---|
440 | if (RTEMS_SUCCESSFUL != sc) |
---|
441 | rtems_libi2c_send_stop (minor); |
---|
442 | return sc; |
---|
443 | } |
---|
444 | |
---|
445 | int |
---|
446 | rtems_libi2c_read_bytes (unsigned32 minor, unsigned char *bytes, int nbytes) |
---|
447 | { |
---|
448 | int sc; |
---|
449 | DECL_CHECKED_BH (busno, bush, minor, -) |
---|
450 | |
---|
451 | if (not_started (busno)) |
---|
452 | return -RTEMS_NOT_OWNER_OF_RESOURCE; |
---|
453 | |
---|
454 | sc = bush->ops->read_bytes (bush, bytes, nbytes); |
---|
455 | if (sc < 0) |
---|
456 | rtems_libi2c_send_stop (minor); |
---|
457 | return sc; |
---|
458 | } |
---|
459 | |
---|
460 | int |
---|
461 | rtems_libi2c_write_bytes (unsigned32 minor, unsigned char *bytes, int nbytes) |
---|
462 | { |
---|
463 | int sc; |
---|
464 | DECL_CHECKED_BH (busno, bush, minor, -) |
---|
465 | |
---|
466 | if (not_started (busno)) |
---|
467 | return -RTEMS_NOT_OWNER_OF_RESOURCE; |
---|
468 | |
---|
469 | sc = bush->ops->write_bytes (bush, bytes, nbytes); |
---|
470 | if (sc < 0) |
---|
471 | rtems_libi2c_send_stop (minor); |
---|
472 | return sc; |
---|
473 | } |
---|
474 | |
---|
475 | static int |
---|
476 | do_s_rw (unsigned32 minor, unsigned char *bytes, int nbytes, int rw) |
---|
477 | { |
---|
478 | rtems_status_code sc; |
---|
479 | rtems_libi2c_bus_t *bush; |
---|
480 | |
---|
481 | if ((sc = rtems_libi2c_send_start (minor))) |
---|
482 | return -sc; |
---|
483 | |
---|
484 | /* at this point, we hold the bus and are sure the minor number is valid */ |
---|
485 | bush = busses[MINOR2BUS (minor)].bush; |
---|
486 | |
---|
487 | if ((sc = bush->ops->send_addr (bush, MINOR2ADDR (minor), rw))) { |
---|
488 | rtems_libi2c_send_stop (minor); |
---|
489 | return -sc; |
---|
490 | } |
---|
491 | |
---|
492 | if (rw) |
---|
493 | sc = bush->ops->read_bytes (bush, bytes, nbytes); |
---|
494 | else |
---|
495 | sc = bush->ops->write_bytes (bush, bytes, nbytes); |
---|
496 | |
---|
497 | if (sc < 0) { |
---|
498 | rtems_libi2c_send_stop (minor); |
---|
499 | } |
---|
500 | return sc; |
---|
501 | } |
---|
502 | |
---|
503 | int |
---|
504 | rtems_libi2c_start_read_bytes (unsigned32 minor, unsigned char *bytes, |
---|
505 | int nbytes) |
---|
506 | { |
---|
507 | return do_s_rw (minor, bytes, nbytes, 1); |
---|
508 | } |
---|
509 | |
---|
510 | int |
---|
511 | rtems_libi2c_start_write_bytes (unsigned32 minor, unsigned char *bytes, |
---|
512 | int nbytes) |
---|
513 | { |
---|
514 | return do_s_rw (minor, bytes, nbytes, 0); |
---|
515 | } |
---|
516 | |
---|
517 | int |
---|
518 | rtems_libi2c_register_drv (char *name, rtems_libi2c_drv_t * drvtbl, |
---|
519 | unsigned busno, unsigned i2caddr) |
---|
520 | { |
---|
521 | int i; |
---|
522 | rtems_status_code err; |
---|
523 | rtems_device_minor_number minor; |
---|
524 | |
---|
525 | if (!libmutex) { |
---|
526 | fprintf (stderr, DRVNM " library not initialized\n"); |
---|
527 | return -RTEMS_NOT_DEFINED; |
---|
528 | } |
---|
529 | |
---|
530 | if (name && strchr (name, '/')) { |
---|
531 | fprintf (stderr, "Invalid name: '%s' -- must not contain '/'\n", name); |
---|
532 | return -RTEMS_INVALID_NAME; |
---|
533 | } |
---|
534 | |
---|
535 | if (busno >= MAX_NO_BUSSES || !busses[busno].bush || i2caddr >= 1 << 10) { |
---|
536 | errno = EINVAL; |
---|
537 | return -RTEMS_INVALID_NUMBER; |
---|
538 | } |
---|
539 | |
---|
540 | if (drvtbl->size < sizeof (*drvtbl)) { |
---|
541 | fprintf (stderr, DRVNM " drv-ops size too small -- misconfiguration?\n"); |
---|
542 | return -RTEMS_NOT_CONFIGURED; |
---|
543 | } |
---|
544 | |
---|
545 | /* allocate slot */ |
---|
546 | LIBLOCK (); |
---|
547 | for (i = 0; i < MAX_NO_DRIVERS; i++) { |
---|
548 | /* driver # 0 is special, it is the built-in raw driver */ |
---|
549 | if (!drvs[i].drv) { |
---|
550 | char *str; |
---|
551 | dev_t dev; |
---|
552 | unsigned32 mode; |
---|
553 | |
---|
554 | /* found a free slot; encode slot + 1 ! */ |
---|
555 | minor = ((i + 1) << 13) | RTEMS_LIBI2C_MAKE_MINOR (busno, i2caddr); |
---|
556 | |
---|
557 | if (name) { |
---|
558 | str = malloc (strlen (busses[busno].name) + strlen (name) + 2); |
---|
559 | sprintf (str, "%s.%s", busses[busno].name, name); |
---|
560 | |
---|
561 | dev = rtems_filesystem_make_dev_t (rtems_libi2c_major, minor); |
---|
562 | |
---|
563 | mode = 0111 | S_IFCHR; |
---|
564 | if (drvtbl->ops->read_entry) |
---|
565 | mode |= 0444; |
---|
566 | if (drvtbl->ops->write_entry) |
---|
567 | mode |= 0222; |
---|
568 | |
---|
569 | /* note that 'umask' is applied to 'mode' */ |
---|
570 | if (mknod (str, mode, dev)) { |
---|
571 | fprintf (stderr, |
---|
572 | "Creating device node failed: %s; you can try to do it manually...\n", |
---|
573 | strerror (errno)); |
---|
574 | } |
---|
575 | |
---|
576 | free (str); |
---|
577 | } |
---|
578 | |
---|
579 | drvs[i].drv = drvtbl; |
---|
580 | |
---|
581 | if (drvtbl->ops->initialization_entry) |
---|
582 | err = |
---|
583 | drvs[i].drv->ops->initialization_entry (rtems_libi2c_major, minor, |
---|
584 | 0); |
---|
585 | else |
---|
586 | err = RTEMS_SUCCESSFUL; |
---|
587 | |
---|
588 | LIBUNLOCK (); |
---|
589 | return err ? -err : minor; |
---|
590 | } |
---|
591 | } |
---|
592 | LIBUNLOCK (); |
---|
593 | return -RTEMS_TOO_MANY; |
---|
594 | } |
---|