| 1 | /* $NetBSD: i2c.c,v 1.54 2016/07/23 18:00:01 jakllsch Exp $ */ |
| 2 | |
| 3 | /* |
| 4 | * Copyright (c) 2003 Wasabi Systems, Inc. |
| 5 | * All rights reserved. |
| 6 | * |
| 7 | * Written by Jason R. Thorpe for Wasabi Systems, Inc. |
| 8 | * |
| 9 | * Redistribution and use in source and binary forms, with or without |
| 10 | * modification, are permitted provided that the following conditions |
| 11 | * are met: |
| 12 | * 1. Redistributions of source code must retain the above copyright |
| 13 | * notice, this list of conditions and the following disclaimer. |
| 14 | * 2. Redistributions in binary form must reproduce the above copyright |
| 15 | * notice, this list of conditions and the following disclaimer in the |
| 16 | * documentation and/or other materials provided with the distribution. |
| 17 | * 3. All advertising materials mentioning features or use of this software |
| 18 | * must display the following acknowledgement: |
| 19 | * This product includes software developed for the NetBSD Project by |
| 20 | * Wasabi Systems, Inc. |
| 21 | * 4. The name of Wasabi Systems, Inc. may not be used to endorse |
| 22 | * or promote products derived from this software without specific prior |
| 23 | * written permission. |
| 24 | * |
| 25 | * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND |
| 26 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED |
| 27 | * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| 28 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL WASABI SYSTEMS, INC |
| 29 | * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| 30 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| 31 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| 32 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| 33 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| 34 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
| 35 | * POSSIBILITY OF SUCH DAMAGE. |
| 36 | */ |
| 37 | |
| 38 | #ifdef _KERNEL_OPT |
| 39 | #include "opt_i2c.h" |
| 40 | #endif |
| 41 | |
| 42 | #include <sys/cdefs.h> |
| 43 | __KERNEL_RCSID(0, "$NetBSD: i2c.c,v 1.54 2016/07/23 18:00:01 jakllsch Exp $" ); |
| 44 | |
| 45 | #include <sys/param.h> |
| 46 | #include <sys/systm.h> |
| 47 | #include <sys/device.h> |
| 48 | #include <sys/event.h> |
| 49 | #include <sys/conf.h> |
| 50 | #include <sys/malloc.h> |
| 51 | #include <sys/kmem.h> |
| 52 | #include <sys/kthread.h> |
| 53 | #include <sys/proc.h> |
| 54 | #include <sys/kernel.h> |
| 55 | #include <sys/fcntl.h> |
| 56 | #include <sys/module.h> |
| 57 | #include <sys/once.h> |
| 58 | #include <sys/mutex.h> |
| 59 | |
| 60 | #include <dev/i2c/i2cvar.h> |
| 61 | |
| 62 | #include "locators.h" |
| 63 | |
| 64 | #ifndef I2C_MAX_ADDR |
| 65 | #define I2C_MAX_ADDR 0x3ff /* 10-bit address, max */ |
| 66 | #endif |
| 67 | |
| 68 | struct iic_softc { |
| 69 | i2c_tag_t sc_tag; |
| 70 | int sc_type; |
| 71 | device_t sc_devices[I2C_MAX_ADDR + 1]; |
| 72 | }; |
| 73 | |
| 74 | static dev_type_open(iic_open); |
| 75 | static dev_type_close(iic_close); |
| 76 | static dev_type_ioctl(iic_ioctl); |
| 77 | |
| 78 | int iic_init(void); |
| 79 | |
| 80 | kmutex_t iic_mtx; |
| 81 | int iic_refcnt; |
| 82 | |
| 83 | ONCE_DECL(iic_once); |
| 84 | |
| 85 | const struct cdevsw iic_cdevsw = { |
| 86 | .d_open = iic_open, |
| 87 | .d_close = iic_close, |
| 88 | .d_read = noread, |
| 89 | .d_write = nowrite, |
| 90 | .d_ioctl = iic_ioctl, |
| 91 | .d_stop = nostop, |
| 92 | .d_tty = notty, |
| 93 | .d_poll = nopoll, |
| 94 | .d_mmap = nommap, |
| 95 | .d_kqfilter = nokqfilter, |
| 96 | .d_discard = nodiscard, |
| 97 | .d_flag = D_OTHER |
| 98 | }; |
| 99 | |
| 100 | extern struct cfdriver iic_cd; |
| 101 | |
| 102 | static void iic_smbus_intr_thread(void *); |
| 103 | static void iic_fill_compat(struct i2c_attach_args*, const char*, |
| 104 | size_t, char **); |
| 105 | |
| 106 | static int |
| 107 | iic_print_direct(void *aux, const char *pnp) |
| 108 | { |
| 109 | struct i2c_attach_args *ia = aux; |
| 110 | |
| 111 | if (pnp != NULL) |
| 112 | aprint_normal("%s at %s addr 0x%02x" , ia->ia_name, pnp, |
| 113 | ia->ia_addr); |
| 114 | else |
| 115 | aprint_normal(" addr 0x%02x" , ia->ia_addr); |
| 116 | |
| 117 | return UNCONF; |
| 118 | } |
| 119 | |
| 120 | static int |
| 121 | iic_print(void *aux, const char *pnp) |
| 122 | { |
| 123 | struct i2c_attach_args *ia = aux; |
| 124 | |
| 125 | if (ia->ia_addr != (i2c_addr_t)-1) |
| 126 | aprint_normal(" addr 0x%x" , ia->ia_addr); |
| 127 | |
| 128 | return UNCONF; |
| 129 | } |
| 130 | |
| 131 | static int |
| 132 | iic_search(device_t parent, cfdata_t cf, const int *ldesc, void *aux) |
| 133 | { |
| 134 | struct iic_softc *sc = device_private(parent); |
| 135 | struct i2c_attach_args ia; |
| 136 | |
| 137 | ia.ia_tag = sc->sc_tag; |
| 138 | ia.ia_size = cf->cf_loc[IICCF_SIZE]; |
| 139 | ia.ia_type = sc->sc_type; |
| 140 | |
| 141 | ia.ia_name = NULL; |
| 142 | ia.ia_ncompat = 0; |
| 143 | ia.ia_compat = NULL; |
| 144 | |
| 145 | for (ia.ia_addr = 0; ia.ia_addr <= I2C_MAX_ADDR; ia.ia_addr++) { |
| 146 | if (sc->sc_devices[ia.ia_addr] != NULL) |
| 147 | continue; |
| 148 | |
| 149 | if (cf->cf_loc[IICCF_ADDR] != -1 && |
| 150 | cf->cf_loc[IICCF_ADDR] != ia.ia_addr) |
| 151 | continue; |
| 152 | |
| 153 | if (config_match(parent, cf, &ia) > 0) |
| 154 | sc->sc_devices[ia.ia_addr] = |
| 155 | config_attach(parent, cf, &ia, iic_print); |
| 156 | } |
| 157 | |
| 158 | return 0; |
| 159 | } |
| 160 | |
| 161 | static void |
| 162 | iic_child_detach(device_t parent, device_t child) |
| 163 | { |
| 164 | struct iic_softc *sc = device_private(parent); |
| 165 | int i; |
| 166 | |
| 167 | for (i = 0; i <= I2C_MAX_ADDR; i++) |
| 168 | if (sc->sc_devices[i] == child) { |
| 169 | sc->sc_devices[i] = NULL; |
| 170 | break; |
| 171 | } |
| 172 | } |
| 173 | |
| 174 | static int |
| 175 | iic_rescan(device_t self, const char *ifattr, const int *locators) |
| 176 | { |
| 177 | config_search_ia(iic_search, self, ifattr, NULL); |
| 178 | return 0; |
| 179 | } |
| 180 | |
| 181 | static int |
| 182 | iic_match(device_t parent, cfdata_t cf, void *aux) |
| 183 | { |
| 184 | |
| 185 | return 1; |
| 186 | } |
| 187 | |
| 188 | static void |
| 189 | iic_attach(device_t parent, device_t self, void *aux) |
| 190 | { |
| 191 | struct iic_softc *sc = device_private(self); |
| 192 | struct i2cbus_attach_args *iba = aux; |
| 193 | prop_array_t child_devices; |
| 194 | prop_dictionary_t props; |
| 195 | char *buf; |
| 196 | i2c_tag_t ic; |
| 197 | int rv; |
| 198 | bool indirect_config; |
| 199 | |
| 200 | aprint_naive("\n" ); |
| 201 | aprint_normal(": I2C bus\n" ); |
| 202 | |
| 203 | sc->sc_tag = iba->iba_tag; |
| 204 | sc->sc_type = iba->iba_type; |
| 205 | ic = sc->sc_tag; |
| 206 | ic->ic_devname = device_xname(self); |
| 207 | |
| 208 | LIST_INIT(&(sc->sc_tag->ic_list)); |
| 209 | LIST_INIT(&(sc->sc_tag->ic_proc_list)); |
| 210 | |
| 211 | rv = kthread_create(PRI_NONE, KTHREAD_MUSTJOIN, NULL, |
| 212 | iic_smbus_intr_thread, ic, &ic->ic_intr_thread, |
| 213 | "%s" , ic->ic_devname); |
| 214 | if (rv) |
| 215 | aprint_error_dev(self, "unable to create intr thread\n" ); |
| 216 | |
| 217 | if (!pmf_device_register(self, NULL, NULL)) |
| 218 | aprint_error_dev(self, "couldn't establish power handler\n" ); |
| 219 | |
| 220 | if (iba->iba_child_devices) { |
| 221 | child_devices = iba->iba_child_devices; |
| 222 | indirect_config = false; |
| 223 | } else { |
| 224 | props = device_properties(parent); |
| 225 | if (!prop_dictionary_get_bool(props, "i2c-indirect-config" , |
| 226 | &indirect_config)) |
| 227 | indirect_config = true; |
| 228 | child_devices = prop_dictionary_get(props, "i2c-child-devices" ); |
| 229 | } |
| 230 | |
| 231 | if (child_devices) { |
| 232 | unsigned int i, count; |
| 233 | prop_dictionary_t dev; |
| 234 | prop_data_t cdata; |
| 235 | uint32_t addr, size; |
| 236 | uint64_t cookie; |
| 237 | const char *name; |
| 238 | struct i2c_attach_args ia; |
| 239 | int loc[IICCF_NLOCS]; |
| 240 | |
| 241 | memset(loc, 0, sizeof loc); |
| 242 | count = prop_array_count(child_devices); |
| 243 | for (i = 0; i < count; i++) { |
| 244 | dev = prop_array_get(child_devices, i); |
| 245 | if (!dev) continue; |
| 246 | if (!prop_dictionary_get_cstring_nocopy( |
| 247 | dev, "name" , &name)) |
| 248 | continue; |
| 249 | if (!prop_dictionary_get_uint32(dev, "addr" , &addr)) |
| 250 | continue; |
| 251 | if (!prop_dictionary_get_uint64(dev, "cookie" , &cookie)) |
| 252 | cookie = 0; |
| 253 | loc[IICCF_ADDR] = addr; |
| 254 | if (prop_dictionary_get_uint32(dev, "size" , &size)) |
| 255 | loc[IICCF_SIZE] = size; |
| 256 | else |
| 257 | size = loc[IICCF_SIZE] = IICCF_SIZE_DEFAULT; |
| 258 | |
| 259 | memset(&ia, 0, sizeof ia); |
| 260 | ia.ia_addr = addr; |
| 261 | ia.ia_type = sc->sc_type; |
| 262 | ia.ia_tag = ic; |
| 263 | ia.ia_name = name; |
| 264 | ia.ia_cookie = cookie; |
| 265 | ia.ia_size = size; |
| 266 | |
| 267 | buf = NULL; |
| 268 | cdata = prop_dictionary_get(dev, "compatible" ); |
| 269 | if (cdata) |
| 270 | iic_fill_compat(&ia, |
| 271 | prop_data_data_nocopy(cdata), |
| 272 | prop_data_size(cdata), &buf); |
| 273 | |
| 274 | if (addr > I2C_MAX_ADDR) { |
| 275 | aprint_error_dev(self, |
| 276 | "WARNING: ignoring bad device address " |
| 277 | "@ 0x%02x\n" , addr); |
| 278 | } else if (sc->sc_devices[addr] == NULL) { |
| 279 | sc->sc_devices[addr] = |
| 280 | config_found_sm_loc(self, "iic" , loc, &ia, |
| 281 | iic_print_direct, NULL); |
| 282 | } |
| 283 | |
| 284 | if (ia.ia_compat) |
| 285 | free(ia.ia_compat, M_TEMP); |
| 286 | if (buf) |
| 287 | free(buf, M_TEMP); |
| 288 | } |
| 289 | } else if (indirect_config) { |
| 290 | /* |
| 291 | * Attach all i2c devices described in the kernel |
| 292 | * configuration file. |
| 293 | */ |
| 294 | iic_rescan(self, "iic" , NULL); |
| 295 | } |
| 296 | } |
| 297 | |
| 298 | static int |
| 299 | iic_detach(device_t self, int flags) |
| 300 | { |
| 301 | struct iic_softc *sc = device_private(self); |
| 302 | i2c_tag_t ic = sc->sc_tag; |
| 303 | int i, error; |
| 304 | void *hdl; |
| 305 | |
| 306 | for (i = 0; i <= I2C_MAX_ADDR; i++) { |
| 307 | if (sc->sc_devices[i]) { |
| 308 | error = config_detach(sc->sc_devices[i], flags); |
| 309 | if (error) |
| 310 | return error; |
| 311 | } |
| 312 | } |
| 313 | |
| 314 | if (ic->ic_running) { |
| 315 | ic->ic_running = 0; |
| 316 | wakeup(ic); |
| 317 | kthread_join(ic->ic_intr_thread); |
| 318 | } |
| 319 | |
| 320 | if (!LIST_EMPTY(&ic->ic_list)) { |
| 321 | device_printf(self, "WARNING: intr handler list not empty\n" ); |
| 322 | while (!LIST_EMPTY(&ic->ic_list)) { |
| 323 | hdl = LIST_FIRST(&ic->ic_list); |
| 324 | iic_smbus_intr_disestablish(ic, hdl); |
| 325 | } |
| 326 | } |
| 327 | if (!LIST_EMPTY(&ic->ic_proc_list)) { |
| 328 | device_printf(self, "WARNING: proc handler list not empty\n" ); |
| 329 | while (!LIST_EMPTY(&ic->ic_proc_list)) { |
| 330 | hdl = LIST_FIRST(&ic->ic_proc_list); |
| 331 | iic_smbus_intr_disestablish_proc(ic, hdl); |
| 332 | } |
| 333 | } |
| 334 | |
| 335 | pmf_device_deregister(self); |
| 336 | |
| 337 | return 0; |
| 338 | } |
| 339 | |
| 340 | static void |
| 341 | iic_smbus_intr_thread(void *aux) |
| 342 | { |
| 343 | i2c_tag_t ic; |
| 344 | struct ic_intr_list *il; |
| 345 | |
| 346 | ic = (i2c_tag_t)aux; |
| 347 | ic->ic_running = 1; |
| 348 | ic->ic_pending = 0; |
| 349 | |
| 350 | while (ic->ic_running) { |
| 351 | if (ic->ic_pending == 0) |
| 352 | tsleep(ic, PZERO, "iicintr" , hz); |
| 353 | if (ic->ic_pending > 0) { |
| 354 | LIST_FOREACH(il, &(ic->ic_proc_list), il_next) { |
| 355 | (*il->il_intr)(il->il_intrarg); |
| 356 | } |
| 357 | ic->ic_pending--; |
| 358 | } |
| 359 | } |
| 360 | |
| 361 | kthread_exit(0); |
| 362 | } |
| 363 | |
| 364 | void * |
| 365 | iic_smbus_intr_establish(i2c_tag_t ic, int (*intr)(void *), void *intrarg) |
| 366 | { |
| 367 | struct ic_intr_list *il; |
| 368 | |
| 369 | il = malloc(sizeof(struct ic_intr_list), M_DEVBUF, M_WAITOK); |
| 370 | if (il == NULL) |
| 371 | return NULL; |
| 372 | |
| 373 | il->il_intr = intr; |
| 374 | il->il_intrarg = intrarg; |
| 375 | |
| 376 | LIST_INSERT_HEAD(&(ic->ic_list), il, il_next); |
| 377 | |
| 378 | return il; |
| 379 | } |
| 380 | |
| 381 | void |
| 382 | iic_smbus_intr_disestablish(i2c_tag_t ic, void *hdl) |
| 383 | { |
| 384 | struct ic_intr_list *il; |
| 385 | |
| 386 | il = (struct ic_intr_list *)hdl; |
| 387 | |
| 388 | LIST_REMOVE(il, il_next); |
| 389 | free(il, M_DEVBUF); |
| 390 | |
| 391 | return; |
| 392 | } |
| 393 | |
| 394 | void * |
| 395 | iic_smbus_intr_establish_proc(i2c_tag_t ic, int (*intr)(void *), void *intrarg) |
| 396 | { |
| 397 | struct ic_intr_list *il; |
| 398 | |
| 399 | il = malloc(sizeof(struct ic_intr_list), M_DEVBUF, M_WAITOK); |
| 400 | if (il == NULL) |
| 401 | return NULL; |
| 402 | |
| 403 | il->il_intr = intr; |
| 404 | il->il_intrarg = intrarg; |
| 405 | |
| 406 | LIST_INSERT_HEAD(&(ic->ic_proc_list), il, il_next); |
| 407 | |
| 408 | return il; |
| 409 | } |
| 410 | |
| 411 | void |
| 412 | iic_smbus_intr_disestablish_proc(i2c_tag_t ic, void *hdl) |
| 413 | { |
| 414 | struct ic_intr_list *il; |
| 415 | |
| 416 | il = (struct ic_intr_list *)hdl; |
| 417 | |
| 418 | LIST_REMOVE(il, il_next); |
| 419 | free(il, M_DEVBUF); |
| 420 | |
| 421 | return; |
| 422 | } |
| 423 | |
| 424 | int |
| 425 | iic_smbus_intr(i2c_tag_t ic) |
| 426 | { |
| 427 | struct ic_intr_list *il; |
| 428 | |
| 429 | LIST_FOREACH(il, &(ic->ic_list), il_next) { |
| 430 | (*il->il_intr)(il->il_intrarg); |
| 431 | } |
| 432 | |
| 433 | ic->ic_pending++; |
| 434 | wakeup(ic); |
| 435 | |
| 436 | return 1; |
| 437 | } |
| 438 | |
| 439 | static void |
| 440 | iic_fill_compat(struct i2c_attach_args *ia, const char *compat, size_t len, |
| 441 | char **buffer) |
| 442 | { |
| 443 | int count, i; |
| 444 | const char *c, *start, **ptr; |
| 445 | |
| 446 | *buffer = NULL; |
| 447 | for (i = count = 0, c = compat; i < len; i++, c++) |
| 448 | if (*c == 0) |
| 449 | count++; |
| 450 | count += 2; |
| 451 | ptr = malloc(sizeof(char*)*count, M_TEMP, M_WAITOK); |
| 452 | if (!ptr) return; |
| 453 | |
| 454 | for (i = count = 0, start = c = compat; i < len; i++, c++) { |
| 455 | if (*c == 0) { |
| 456 | ptr[count++] = start; |
| 457 | start = c+1; |
| 458 | } |
| 459 | } |
| 460 | if (start < compat+len) { |
| 461 | /* last string not 0 terminated */ |
| 462 | size_t l = c-start; |
| 463 | *buffer = malloc(l+1, M_TEMP, M_WAITOK); |
| 464 | memcpy(*buffer, start, l); |
| 465 | (*buffer)[l] = 0; |
| 466 | ptr[count++] = *buffer; |
| 467 | } |
| 468 | ptr[count] = NULL; |
| 469 | |
| 470 | ia->ia_compat = ptr; |
| 471 | ia->ia_ncompat = count; |
| 472 | } |
| 473 | |
| 474 | int |
| 475 | iic_compat_match(struct i2c_attach_args *ia, const char ** compats) |
| 476 | { |
| 477 | int i; |
| 478 | |
| 479 | for (; compats && *compats; compats++) { |
| 480 | for (i = 0; i < ia->ia_ncompat; i++) { |
| 481 | if (strcmp(*compats, ia->ia_compat[i]) == 0) |
| 482 | return 1; |
| 483 | } |
| 484 | } |
| 485 | return 0; |
| 486 | } |
| 487 | |
| 488 | static int |
| 489 | iic_open(dev_t dev, int flag, int fmt, lwp_t *l) |
| 490 | { |
| 491 | struct iic_softc *sc = device_lookup_private(&iic_cd, minor(dev)); |
| 492 | |
| 493 | mutex_enter(&iic_mtx); |
| 494 | if (sc == NULL) { |
| 495 | mutex_exit(&iic_mtx); |
| 496 | return ENXIO; |
| 497 | } |
| 498 | iic_refcnt++; |
| 499 | mutex_exit(&iic_mtx); |
| 500 | |
| 501 | return 0; |
| 502 | } |
| 503 | |
| 504 | static int |
| 505 | iic_close(dev_t dev, int flag, int fmt, lwp_t *l) |
| 506 | { |
| 507 | |
| 508 | mutex_enter(&iic_mtx); |
| 509 | iic_refcnt--; |
| 510 | mutex_exit(&iic_mtx); |
| 511 | |
| 512 | return 0; |
| 513 | } |
| 514 | |
| 515 | static int |
| 516 | iic_ioctl_exec(struct iic_softc *sc, i2c_ioctl_exec_t *iie, int flag) |
| 517 | { |
| 518 | i2c_tag_t ic = sc->sc_tag; |
| 519 | uint8_t buf[I2C_EXEC_MAX_BUFLEN]; |
| 520 | void *cmd = NULL; |
| 521 | int error; |
| 522 | |
| 523 | /* Validate parameters */ |
| 524 | if (iie->iie_addr > I2C_MAX_ADDR) |
| 525 | return EINVAL; |
| 526 | if (iie->iie_cmdlen > I2C_EXEC_MAX_CMDLEN || |
| 527 | iie->iie_buflen > I2C_EXEC_MAX_BUFLEN) |
| 528 | return EINVAL; |
| 529 | if (iie->iie_cmd != NULL && iie->iie_cmdlen == 0) |
| 530 | return EINVAL; |
| 531 | if (iie->iie_buf != NULL && iie->iie_buflen == 0) |
| 532 | return EINVAL; |
| 533 | if (I2C_OP_WRITE_P(iie->iie_op) && (flag & FWRITE) == 0) |
| 534 | return EBADF; |
| 535 | |
| 536 | #if 0 |
| 537 | /* Disallow userspace access to devices that have drivers attached. */ |
| 538 | if (sc->sc_devices[iie->iie_addr] != NULL) |
| 539 | return EBUSY; |
| 540 | #endif |
| 541 | |
| 542 | if (iie->iie_cmd != NULL) { |
| 543 | cmd = kmem_alloc(iie->iie_cmdlen, KM_SLEEP); |
| 544 | if (cmd == NULL) |
| 545 | return ENOMEM; |
| 546 | error = copyin(iie->iie_cmd, cmd, iie->iie_cmdlen); |
| 547 | if (error) |
| 548 | goto out; |
| 549 | } |
| 550 | |
| 551 | if (iie->iie_buf != NULL && I2C_OP_WRITE_P(iie->iie_op)) { |
| 552 | error = copyin(iie->iie_buf, buf, iie->iie_buflen); |
| 553 | if (error) |
| 554 | goto out; |
| 555 | } |
| 556 | |
| 557 | iic_acquire_bus(ic, 0); |
| 558 | error = iic_exec(ic, iie->iie_op, iie->iie_addr, cmd, iie->iie_cmdlen, |
| 559 | buf, iie->iie_buflen, 0); |
| 560 | iic_release_bus(ic, 0); |
| 561 | |
| 562 | /* |
| 563 | * Some drivers return error codes on failure, and others return -1. |
| 564 | */ |
| 565 | if (error < 0) |
| 566 | error = EIO; |
| 567 | |
| 568 | out: |
| 569 | if (cmd) |
| 570 | kmem_free(cmd, iie->iie_cmdlen); |
| 571 | |
| 572 | if (error) |
| 573 | return error; |
| 574 | |
| 575 | if (iie->iie_buf != NULL && I2C_OP_READ_P(iie->iie_op)) |
| 576 | error = copyout(buf, iie->iie_buf, iie->iie_buflen); |
| 577 | |
| 578 | return error; |
| 579 | } |
| 580 | |
| 581 | static int |
| 582 | iic_ioctl(dev_t dev, u_long cmd, void *data, int flag, lwp_t *l) |
| 583 | { |
| 584 | struct iic_softc *sc = device_lookup_private(&iic_cd, minor(dev)); |
| 585 | |
| 586 | if (sc == NULL) |
| 587 | return ENXIO; |
| 588 | |
| 589 | switch (cmd) { |
| 590 | case I2C_IOCTL_EXEC: |
| 591 | return iic_ioctl_exec(sc, (i2c_ioctl_exec_t *)data, flag); |
| 592 | default: |
| 593 | return ENODEV; |
| 594 | } |
| 595 | } |
| 596 | |
| 597 | |
| 598 | CFATTACH_DECL2_NEW(iic, sizeof(struct iic_softc), |
| 599 | iic_match, iic_attach, iic_detach, NULL, iic_rescan, iic_child_detach); |
| 600 | |
| 601 | MODULE(MODULE_CLASS_DRIVER, iic, "i2cexec,i2c_bitbang" ); |
| 602 | |
| 603 | #ifdef _MODULE |
| 604 | #include "ioconf.c" |
| 605 | #endif |
| 606 | |
| 607 | int |
| 608 | iic_init(void) |
| 609 | { |
| 610 | |
| 611 | mutex_init(&iic_mtx, MUTEX_DEFAULT, IPL_NONE); |
| 612 | iic_refcnt = 0; |
| 613 | return 0; |
| 614 | } |
| 615 | |
| 616 | static int |
| 617 | iic_modcmd(modcmd_t cmd, void *opaque) |
| 618 | { |
| 619 | #ifdef _MODULE |
| 620 | int bmajor, cmajor; |
| 621 | #endif |
| 622 | int error; |
| 623 | |
| 624 | error = 0; |
| 625 | switch (cmd) { |
| 626 | case MODULE_CMD_INIT: |
| 627 | RUN_ONCE(&iic_once, iic_init); |
| 628 | |
| 629 | #ifdef _MODULE |
| 630 | mutex_enter(&iic_mtx); |
| 631 | bmajor = cmajor = -1; |
| 632 | error = devsw_attach("iic" , NULL, &bmajor, |
| 633 | &iic_cdevsw, &cmajor); |
| 634 | if (error != 0) { |
| 635 | mutex_exit(&iic_mtx); |
| 636 | break; |
| 637 | } |
| 638 | error = config_init_component(cfdriver_ioconf_iic, |
| 639 | cfattach_ioconf_iic, cfdata_ioconf_iic); |
| 640 | if (error) { |
| 641 | aprint_error("%s: unable to init component\n" , |
| 642 | iic_cd.cd_name); |
| 643 | (void)devsw_detach(NULL, &iic_cdevsw); |
| 644 | } |
| 645 | mutex_exit(&iic_mtx); |
| 646 | #endif |
| 647 | break; |
| 648 | case MODULE_CMD_FINI: |
| 649 | mutex_enter(&iic_mtx); |
| 650 | if (iic_refcnt != 0) { |
| 651 | mutex_exit(&iic_mtx); |
| 652 | return EBUSY; |
| 653 | } |
| 654 | #ifdef _MODULE |
| 655 | error = config_fini_component(cfdriver_ioconf_iic, |
| 656 | cfattach_ioconf_iic, cfdata_ioconf_iic); |
| 657 | if (error != 0) { |
| 658 | mutex_exit(&iic_mtx); |
| 659 | break; |
| 660 | } |
| 661 | error = devsw_detach(NULL, &iic_cdevsw); |
| 662 | if (error != 0) |
| 663 | config_init_component(cfdriver_ioconf_iic, |
| 664 | cfattach_ioconf_iic, cfdata_ioconf_iic); |
| 665 | #endif |
| 666 | mutex_exit(&iic_mtx); |
| 667 | break; |
| 668 | default: |
| 669 | error = ENOTTY; |
| 670 | } |
| 671 | return error; |
| 672 | } |
| 673 | |