Iliyan Malchev | caff4ca | 2009-07-17 13:10:30 +0200 | [diff] [blame^] | 1 | /* arch/arm/mach-msm/qdsp5/adsp_driver.c |
| 2 | * |
| 3 | * Copyright (C) 2008 Google, Inc. |
| 4 | * Author: Iliyan Malchev <ibm@android.com> |
| 5 | * |
| 6 | * This software is licensed under the terms of the GNU General Public |
| 7 | * License version 2, as published by the Free Software Foundation, and |
| 8 | * may be copied, distributed, and modified under those terms. |
| 9 | * |
| 10 | * This program is distributed in the hope that it will be useful, |
| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | * GNU General Public License for more details. |
| 14 | * |
| 15 | */ |
| 16 | |
| 17 | #include <linux/cdev.h> |
| 18 | #include <linux/fs.h> |
| 19 | #include <linux/list.h> |
| 20 | #include <linux/platform_device.h> |
| 21 | #include <linux/sched.h> |
| 22 | #include <linux/uaccess.h> |
| 23 | |
| 24 | #include "adsp.h" |
| 25 | |
| 26 | #include <linux/msm_adsp.h> |
| 27 | #include <linux/android_pmem.h> |
| 28 | |
| 29 | struct adsp_pmem_region { |
| 30 | struct hlist_node list; |
| 31 | void *vaddr; |
| 32 | unsigned long paddr; |
| 33 | unsigned long kvaddr; |
| 34 | unsigned long len; |
| 35 | struct file *file; |
| 36 | }; |
| 37 | |
| 38 | struct adsp_device { |
| 39 | struct msm_adsp_module *module; |
| 40 | |
| 41 | spinlock_t event_queue_lock; |
| 42 | wait_queue_head_t event_wait; |
| 43 | struct list_head event_queue; |
| 44 | int abort; |
| 45 | |
| 46 | const char *name; |
| 47 | struct device *device; |
| 48 | struct cdev cdev; |
| 49 | }; |
| 50 | |
| 51 | static struct adsp_device *inode_to_device(struct inode *inode); |
| 52 | |
| 53 | #define __CONTAINS(r, v, l) ({ \ |
| 54 | typeof(r) __r = r; \ |
| 55 | typeof(v) __v = v; \ |
| 56 | typeof(v) __e = __v + l; \ |
| 57 | int res = __v >= __r->vaddr && \ |
| 58 | __e <= __r->vaddr + __r->len; \ |
| 59 | res; \ |
| 60 | }) |
| 61 | |
| 62 | #define CONTAINS(r1, r2) ({ \ |
| 63 | typeof(r2) __r2 = r2; \ |
| 64 | __CONTAINS(r1, __r2->vaddr, __r2->len); \ |
| 65 | }) |
| 66 | |
| 67 | #define IN_RANGE(r, v) ({ \ |
| 68 | typeof(r) __r = r; \ |
| 69 | typeof(v) __vv = v; \ |
| 70 | int res = ((__vv >= __r->vaddr) && \ |
| 71 | (__vv < (__r->vaddr + __r->len))); \ |
| 72 | res; \ |
| 73 | }) |
| 74 | |
| 75 | #define OVERLAPS(r1, r2) ({ \ |
| 76 | typeof(r1) __r1 = r1; \ |
| 77 | typeof(r2) __r2 = r2; \ |
| 78 | typeof(__r2->vaddr) __v = __r2->vaddr; \ |
| 79 | typeof(__v) __e = __v + __r2->len - 1; \ |
| 80 | int res = (IN_RANGE(__r1, __v) || IN_RANGE(__r1, __e)); \ |
| 81 | res; \ |
| 82 | }) |
| 83 | |
| 84 | static int adsp_pmem_check(struct msm_adsp_module *module, |
| 85 | void *vaddr, unsigned long len) |
| 86 | { |
| 87 | struct adsp_pmem_region *region_elt; |
| 88 | struct hlist_node *node; |
| 89 | struct adsp_pmem_region t = { .vaddr = vaddr, .len = len }; |
| 90 | |
| 91 | hlist_for_each_entry(region_elt, node, &module->pmem_regions, list) { |
| 92 | if (CONTAINS(region_elt, &t) || CONTAINS(&t, region_elt) || |
| 93 | OVERLAPS(region_elt, &t)) { |
| 94 | printk(KERN_ERR "adsp: module %s:" |
| 95 | " region (vaddr %p len %ld)" |
| 96 | " clashes with registered region" |
| 97 | " (vaddr %p paddr %p len %ld)\n", |
| 98 | module->name, |
| 99 | vaddr, len, |
| 100 | region_elt->vaddr, |
| 101 | (void *)region_elt->paddr, |
| 102 | region_elt->len); |
| 103 | return -EINVAL; |
| 104 | } |
| 105 | } |
| 106 | |
| 107 | return 0; |
| 108 | } |
| 109 | |
| 110 | static int adsp_pmem_add(struct msm_adsp_module *module, |
| 111 | struct adsp_pmem_info *info) |
| 112 | { |
| 113 | unsigned long paddr, kvaddr, len; |
| 114 | struct file *file; |
| 115 | struct adsp_pmem_region *region; |
| 116 | int rc = -EINVAL; |
| 117 | |
| 118 | mutex_lock(&module->pmem_regions_lock); |
| 119 | region = kmalloc(sizeof(*region), GFP_KERNEL); |
| 120 | if (!region) { |
| 121 | rc = -ENOMEM; |
| 122 | goto end; |
| 123 | } |
| 124 | INIT_HLIST_NODE(®ion->list); |
| 125 | if (get_pmem_file(info->fd, &paddr, &kvaddr, &len, &file)) { |
| 126 | kfree(region); |
| 127 | goto end; |
| 128 | } |
| 129 | |
| 130 | rc = adsp_pmem_check(module, info->vaddr, len); |
| 131 | if (rc < 0) { |
| 132 | put_pmem_file(file); |
| 133 | kfree(region); |
| 134 | goto end; |
| 135 | } |
| 136 | |
| 137 | region->vaddr = info->vaddr; |
| 138 | region->paddr = paddr; |
| 139 | region->kvaddr = kvaddr; |
| 140 | region->len = len; |
| 141 | region->file = file; |
| 142 | |
| 143 | hlist_add_head(®ion->list, &module->pmem_regions); |
| 144 | end: |
| 145 | mutex_unlock(&module->pmem_regions_lock); |
| 146 | return rc; |
| 147 | } |
| 148 | |
| 149 | static int adsp_pmem_lookup_vaddr(struct msm_adsp_module *module, void **addr, |
| 150 | unsigned long len, struct adsp_pmem_region **region) |
| 151 | { |
| 152 | struct hlist_node *node; |
| 153 | void *vaddr = *addr; |
| 154 | struct adsp_pmem_region *region_elt; |
| 155 | |
| 156 | int match_count = 0; |
| 157 | |
| 158 | *region = NULL; |
| 159 | |
| 160 | /* returns physical address or zero */ |
| 161 | hlist_for_each_entry(region_elt, node, &module->pmem_regions, list) { |
| 162 | if (vaddr >= region_elt->vaddr && |
| 163 | vaddr < region_elt->vaddr + region_elt->len && |
| 164 | vaddr + len <= region_elt->vaddr + region_elt->len) { |
| 165 | /* offset since we could pass vaddr inside a registerd |
| 166 | * pmem buffer |
| 167 | */ |
| 168 | |
| 169 | match_count++; |
| 170 | if (!*region) |
| 171 | *region = region_elt; |
| 172 | } |
| 173 | } |
| 174 | |
| 175 | if (match_count > 1) { |
| 176 | printk(KERN_ERR "adsp: module %s: " |
| 177 | "multiple hits for vaddr %p, len %ld\n", |
| 178 | module->name, vaddr, len); |
| 179 | hlist_for_each_entry(region_elt, node, |
| 180 | &module->pmem_regions, list) { |
| 181 | if (vaddr >= region_elt->vaddr && |
| 182 | vaddr < region_elt->vaddr + region_elt->len && |
| 183 | vaddr + len <= region_elt->vaddr + region_elt->len) |
| 184 | printk(KERN_ERR "\t%p, %ld --> %p\n", |
| 185 | region_elt->vaddr, |
| 186 | region_elt->len, |
| 187 | (void *)region_elt->paddr); |
| 188 | } |
| 189 | } |
| 190 | |
| 191 | return *region ? 0 : -1; |
| 192 | } |
| 193 | |
| 194 | int adsp_pmem_fixup_kvaddr(struct msm_adsp_module *module, void **addr, |
| 195 | unsigned long *kvaddr, unsigned long len) |
| 196 | { |
| 197 | struct adsp_pmem_region *region; |
| 198 | void *vaddr = *addr; |
| 199 | unsigned long *paddr = (unsigned long *)addr; |
| 200 | int ret; |
| 201 | |
| 202 | ret = adsp_pmem_lookup_vaddr(module, addr, len, ®ion); |
| 203 | if (ret) { |
| 204 | printk(KERN_ERR "adsp: not patching %s (paddr & kvaddr)," |
| 205 | " lookup (%p, %ld) failed\n", |
| 206 | module->name, vaddr, len); |
| 207 | return ret; |
| 208 | } |
| 209 | *paddr = region->paddr + (vaddr - region->vaddr); |
| 210 | *kvaddr = region->kvaddr + (vaddr - region->vaddr); |
| 211 | return 0; |
| 212 | } |
| 213 | |
| 214 | int adsp_pmem_fixup(struct msm_adsp_module *module, void **addr, |
| 215 | unsigned long len) |
| 216 | { |
| 217 | struct adsp_pmem_region *region; |
| 218 | void *vaddr = *addr; |
| 219 | unsigned long *paddr = (unsigned long *)addr; |
| 220 | int ret; |
| 221 | |
| 222 | ret = adsp_pmem_lookup_vaddr(module, addr, len, ®ion); |
| 223 | if (ret) { |
| 224 | printk(KERN_ERR "adsp: not patching %s, lookup (%p, %ld) failed\n", |
| 225 | module->name, vaddr, len); |
| 226 | return ret; |
| 227 | } |
| 228 | |
| 229 | *paddr = region->paddr + (vaddr - region->vaddr); |
| 230 | return 0; |
| 231 | } |
| 232 | |
| 233 | static int adsp_verify_cmd(struct msm_adsp_module *module, |
| 234 | unsigned int queue_id, void *cmd_data, |
| 235 | size_t cmd_size) |
| 236 | { |
| 237 | /* call the per module verifier */ |
| 238 | if (module->verify_cmd) |
| 239 | return module->verify_cmd(module, queue_id, cmd_data, |
| 240 | cmd_size); |
| 241 | else |
| 242 | printk(KERN_INFO "adsp: no packet verifying function " |
| 243 | "for task %s\n", module->name); |
| 244 | return 0; |
| 245 | } |
| 246 | |
| 247 | static long adsp_write_cmd(struct adsp_device *adev, void __user *arg) |
| 248 | { |
| 249 | struct adsp_command_t cmd; |
| 250 | unsigned char buf[256]; |
| 251 | void *cmd_data; |
| 252 | long rc; |
| 253 | |
| 254 | if (copy_from_user(&cmd, (void __user *)arg, sizeof(cmd))) |
| 255 | return -EFAULT; |
| 256 | |
| 257 | if (cmd.len > 256) { |
| 258 | cmd_data = kmalloc(cmd.len, GFP_USER); |
| 259 | if (!cmd_data) |
| 260 | return -ENOMEM; |
| 261 | } else { |
| 262 | cmd_data = buf; |
| 263 | } |
| 264 | |
| 265 | if (copy_from_user(cmd_data, (void __user *)(cmd.data), cmd.len)) { |
| 266 | rc = -EFAULT; |
| 267 | goto end; |
| 268 | } |
| 269 | |
| 270 | mutex_lock(&adev->module->pmem_regions_lock); |
| 271 | if (adsp_verify_cmd(adev->module, cmd.queue, cmd_data, cmd.len)) { |
| 272 | printk(KERN_ERR "module %s: verify failed.\n", |
| 273 | adev->module->name); |
| 274 | rc = -EINVAL; |
| 275 | goto end; |
| 276 | } |
| 277 | rc = msm_adsp_write(adev->module, cmd.queue, cmd_data, cmd.len); |
| 278 | end: |
| 279 | mutex_unlock(&adev->module->pmem_regions_lock); |
| 280 | |
| 281 | if (cmd.len > 256) |
| 282 | kfree(cmd_data); |
| 283 | |
| 284 | return rc; |
| 285 | } |
| 286 | |
| 287 | static int adsp_events_pending(struct adsp_device *adev) |
| 288 | { |
| 289 | unsigned long flags; |
| 290 | int yes; |
| 291 | spin_lock_irqsave(&adev->event_queue_lock, flags); |
| 292 | yes = !list_empty(&adev->event_queue); |
| 293 | spin_unlock_irqrestore(&adev->event_queue_lock, flags); |
| 294 | return yes || adev->abort; |
| 295 | } |
| 296 | |
| 297 | static int adsp_pmem_lookup_paddr(struct msm_adsp_module *module, void **addr, |
| 298 | struct adsp_pmem_region **region) |
| 299 | { |
| 300 | struct hlist_node *node; |
| 301 | unsigned long paddr = (unsigned long)(*addr); |
| 302 | struct adsp_pmem_region *region_elt; |
| 303 | |
| 304 | hlist_for_each_entry(region_elt, node, &module->pmem_regions, list) { |
| 305 | if (paddr >= region_elt->paddr && |
| 306 | paddr < region_elt->paddr + region_elt->len) { |
| 307 | *region = region_elt; |
| 308 | return 0; |
| 309 | } |
| 310 | } |
| 311 | return -1; |
| 312 | } |
| 313 | |
| 314 | int adsp_pmem_paddr_fixup(struct msm_adsp_module *module, void **addr) |
| 315 | { |
| 316 | struct adsp_pmem_region *region; |
| 317 | unsigned long paddr = (unsigned long)(*addr); |
| 318 | unsigned long *vaddr = (unsigned long *)addr; |
| 319 | int ret; |
| 320 | |
| 321 | ret = adsp_pmem_lookup_paddr(module, addr, ®ion); |
| 322 | if (ret) { |
| 323 | printk(KERN_ERR "adsp: not patching %s, paddr %p lookup failed\n", |
| 324 | module->name, vaddr); |
| 325 | return ret; |
| 326 | } |
| 327 | |
| 328 | *vaddr = (unsigned long)region->vaddr + (paddr - region->paddr); |
| 329 | return 0; |
| 330 | } |
| 331 | |
| 332 | static int adsp_patch_event(struct msm_adsp_module *module, |
| 333 | struct adsp_event *event) |
| 334 | { |
| 335 | /* call the per-module msg verifier */ |
| 336 | if (module->patch_event) |
| 337 | return module->patch_event(module, event); |
| 338 | return 0; |
| 339 | } |
| 340 | |
| 341 | static long adsp_get_event(struct adsp_device *adev, void __user *arg) |
| 342 | { |
| 343 | unsigned long flags; |
| 344 | struct adsp_event *data = NULL; |
| 345 | struct adsp_event_t evt; |
| 346 | int timeout; |
| 347 | long rc = 0; |
| 348 | |
| 349 | if (copy_from_user(&evt, arg, sizeof(struct adsp_event_t))) |
| 350 | return -EFAULT; |
| 351 | |
| 352 | timeout = (int)evt.timeout_ms; |
| 353 | |
| 354 | if (timeout > 0) { |
| 355 | rc = wait_event_interruptible_timeout( |
| 356 | adev->event_wait, adsp_events_pending(adev), |
| 357 | msecs_to_jiffies(timeout)); |
| 358 | if (rc == 0) |
| 359 | return -ETIMEDOUT; |
| 360 | } else { |
| 361 | rc = wait_event_interruptible( |
| 362 | adev->event_wait, adsp_events_pending(adev)); |
| 363 | } |
| 364 | if (rc < 0) |
| 365 | return rc; |
| 366 | |
| 367 | if (adev->abort) |
| 368 | return -ENODEV; |
| 369 | |
| 370 | spin_lock_irqsave(&adev->event_queue_lock, flags); |
| 371 | if (!list_empty(&adev->event_queue)) { |
| 372 | data = list_first_entry(&adev->event_queue, |
| 373 | struct adsp_event, list); |
| 374 | list_del(&data->list); |
| 375 | } |
| 376 | spin_unlock_irqrestore(&adev->event_queue_lock, flags); |
| 377 | |
| 378 | if (!data) |
| 379 | return -EAGAIN; |
| 380 | |
| 381 | /* DSP messages are type 0; they may contain physical addresses */ |
| 382 | if (data->type == 0) |
| 383 | adsp_patch_event(adev->module, data); |
| 384 | |
| 385 | /* map adsp_event --> adsp_event_t */ |
| 386 | if (evt.len < data->size) { |
| 387 | rc = -ETOOSMALL; |
| 388 | goto end; |
| 389 | } |
| 390 | if (data->msg_id != EVENT_MSG_ID) { |
| 391 | if (copy_to_user((void *)(evt.data), data->data.msg16, |
| 392 | data->size)) { |
| 393 | rc = -EFAULT; |
| 394 | goto end; |
| 395 | } |
| 396 | } else { |
| 397 | if (copy_to_user((void *)(evt.data), data->data.msg32, |
| 398 | data->size)) { |
| 399 | rc = -EFAULT; |
| 400 | goto end; |
| 401 | } |
| 402 | } |
| 403 | |
| 404 | evt.type = data->type; /* 0 --> from aDSP, 1 --> from ARM9 */ |
| 405 | evt.msg_id = data->msg_id; |
| 406 | evt.flags = data->is16; |
| 407 | evt.len = data->size; |
| 408 | if (copy_to_user(arg, &evt, sizeof(evt))) |
| 409 | rc = -EFAULT; |
| 410 | end: |
| 411 | kfree(data); |
| 412 | return rc; |
| 413 | } |
| 414 | |
| 415 | static long adsp_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) |
| 416 | { |
| 417 | struct adsp_device *adev = filp->private_data; |
| 418 | |
| 419 | switch (cmd) { |
| 420 | case ADSP_IOCTL_ENABLE: |
| 421 | return msm_adsp_enable(adev->module); |
| 422 | |
| 423 | case ADSP_IOCTL_DISABLE: |
| 424 | return msm_adsp_disable(adev->module); |
| 425 | |
| 426 | case ADSP_IOCTL_DISABLE_EVENT_RSP: |
| 427 | return 0; |
| 428 | |
| 429 | case ADSP_IOCTL_DISABLE_ACK: |
| 430 | pr_err("adsp: ADSP_IOCTL_DISABLE_ACK is not implemented.\n"); |
| 431 | break; |
| 432 | |
| 433 | case ADSP_IOCTL_WRITE_COMMAND: |
| 434 | return adsp_write_cmd(adev, (void __user *) arg); |
| 435 | |
| 436 | case ADSP_IOCTL_GET_EVENT: |
| 437 | return adsp_get_event(adev, (void __user *) arg); |
| 438 | |
| 439 | case ADSP_IOCTL_SET_CLKRATE: { |
| 440 | #if CONFIG_MSM_AMSS_VERSION==6350 |
| 441 | unsigned long clk_rate; |
| 442 | if (copy_from_user(&clk_rate, (void *) arg, sizeof(clk_rate))) |
| 443 | return -EFAULT; |
| 444 | return adsp_set_clkrate(adev->module, clk_rate); |
| 445 | #endif |
| 446 | } |
| 447 | |
| 448 | case ADSP_IOCTL_REGISTER_PMEM: { |
| 449 | struct adsp_pmem_info info; |
| 450 | if (copy_from_user(&info, (void *) arg, sizeof(info))) |
| 451 | return -EFAULT; |
| 452 | return adsp_pmem_add(adev->module, &info); |
| 453 | } |
| 454 | |
| 455 | case ADSP_IOCTL_ABORT_EVENT_READ: |
| 456 | adev->abort = 1; |
| 457 | wake_up(&adev->event_wait); |
| 458 | break; |
| 459 | |
| 460 | default: |
| 461 | break; |
| 462 | } |
| 463 | return -EINVAL; |
| 464 | } |
| 465 | |
| 466 | static int adsp_release(struct inode *inode, struct file *filp) |
| 467 | { |
| 468 | struct adsp_device *adev = filp->private_data; |
| 469 | struct msm_adsp_module *module = adev->module; |
| 470 | struct hlist_node *node, *tmp; |
| 471 | struct adsp_pmem_region *region; |
| 472 | |
| 473 | pr_info("adsp_release() '%s'\n", adev->name); |
| 474 | |
| 475 | /* clear module before putting it to avoid race with open() */ |
| 476 | adev->module = NULL; |
| 477 | |
| 478 | mutex_lock(&module->pmem_regions_lock); |
| 479 | hlist_for_each_safe(node, tmp, &module->pmem_regions) { |
| 480 | region = hlist_entry(node, struct adsp_pmem_region, list); |
| 481 | hlist_del(node); |
| 482 | put_pmem_file(region->file); |
| 483 | kfree(region); |
| 484 | } |
| 485 | mutex_unlock(&module->pmem_regions_lock); |
| 486 | BUG_ON(!hlist_empty(&module->pmem_regions)); |
| 487 | |
| 488 | msm_adsp_put(module); |
| 489 | return 0; |
| 490 | } |
| 491 | |
| 492 | static void adsp_event(void *driver_data, unsigned id, size_t len, |
| 493 | void (*getevent)(void *ptr, size_t len)) |
| 494 | { |
| 495 | struct adsp_device *adev = driver_data; |
| 496 | struct adsp_event *event; |
| 497 | unsigned long flags; |
| 498 | |
| 499 | if (len > ADSP_EVENT_MAX_SIZE) { |
| 500 | pr_err("adsp_event: event too large (%d bytes)\n", len); |
| 501 | return; |
| 502 | } |
| 503 | |
| 504 | event = kmalloc(sizeof(*event), GFP_ATOMIC); |
| 505 | if (!event) { |
| 506 | pr_err("adsp_event: cannot allocate buffer\n"); |
| 507 | return; |
| 508 | } |
| 509 | |
| 510 | if (id != EVENT_MSG_ID) { |
| 511 | event->type = 0; |
| 512 | event->is16 = 0; |
| 513 | event->msg_id = id; |
| 514 | event->size = len; |
| 515 | |
| 516 | getevent(event->data.msg16, len); |
| 517 | } else { |
| 518 | event->type = 1; |
| 519 | event->is16 = 1; |
| 520 | event->msg_id = id; |
| 521 | event->size = len; |
| 522 | getevent(event->data.msg32, len); |
| 523 | } |
| 524 | |
| 525 | spin_lock_irqsave(&adev->event_queue_lock, flags); |
| 526 | list_add_tail(&event->list, &adev->event_queue); |
| 527 | spin_unlock_irqrestore(&adev->event_queue_lock, flags); |
| 528 | wake_up(&adev->event_wait); |
| 529 | } |
| 530 | |
| 531 | static struct msm_adsp_ops adsp_ops = { |
| 532 | .event = adsp_event, |
| 533 | }; |
| 534 | |
| 535 | static int adsp_open(struct inode *inode, struct file *filp) |
| 536 | { |
| 537 | struct adsp_device *adev; |
| 538 | int rc; |
| 539 | |
| 540 | rc = nonseekable_open(inode, filp); |
| 541 | if (rc < 0) |
| 542 | return rc; |
| 543 | |
| 544 | adev = inode_to_device(inode); |
| 545 | if (!adev) |
| 546 | return -ENODEV; |
| 547 | |
| 548 | pr_info("adsp_open() name = '%s'\n", adev->name); |
| 549 | |
| 550 | rc = msm_adsp_get(adev->name, &adev->module, &adsp_ops, adev); |
| 551 | if (rc) |
| 552 | return rc; |
| 553 | |
| 554 | pr_info("adsp_open() module '%s' adev %p\n", adev->name, adev); |
| 555 | filp->private_data = adev; |
| 556 | adev->abort = 0; |
| 557 | INIT_HLIST_HEAD(&adev->module->pmem_regions); |
| 558 | mutex_init(&adev->module->pmem_regions_lock); |
| 559 | |
| 560 | return 0; |
| 561 | } |
| 562 | |
| 563 | static unsigned adsp_device_count; |
| 564 | static struct adsp_device *adsp_devices; |
| 565 | |
| 566 | static struct adsp_device *inode_to_device(struct inode *inode) |
| 567 | { |
| 568 | unsigned n = MINOR(inode->i_rdev); |
| 569 | if (n < adsp_device_count) { |
| 570 | if (adsp_devices[n].device) |
| 571 | return adsp_devices + n; |
| 572 | } |
| 573 | return NULL; |
| 574 | } |
| 575 | |
| 576 | static dev_t adsp_devno; |
| 577 | static struct class *adsp_class; |
| 578 | |
| 579 | static struct file_operations adsp_fops = { |
| 580 | .owner = THIS_MODULE, |
| 581 | .open = adsp_open, |
| 582 | .unlocked_ioctl = adsp_ioctl, |
| 583 | .release = adsp_release, |
| 584 | }; |
| 585 | |
| 586 | static void adsp_create(struct adsp_device *adev, const char *name, |
| 587 | struct device *parent, dev_t devt) |
| 588 | { |
| 589 | struct device *dev; |
| 590 | int rc; |
| 591 | |
| 592 | dev = device_create(adsp_class, parent, devt, "%s", name); |
| 593 | if (IS_ERR(dev)) |
| 594 | return; |
| 595 | |
| 596 | init_waitqueue_head(&adev->event_wait); |
| 597 | INIT_LIST_HEAD(&adev->event_queue); |
| 598 | spin_lock_init(&adev->event_queue_lock); |
| 599 | |
| 600 | cdev_init(&adev->cdev, &adsp_fops); |
| 601 | adev->cdev.owner = THIS_MODULE; |
| 602 | |
| 603 | rc = cdev_add(&adev->cdev, devt, 1); |
| 604 | if (rc < 0) { |
| 605 | device_destroy(adsp_class, devt); |
| 606 | } else { |
| 607 | adev->device = dev; |
| 608 | adev->name = name; |
| 609 | } |
| 610 | } |
| 611 | |
| 612 | void msm_adsp_publish_cdevs(struct msm_adsp_module *modules, unsigned n) |
| 613 | { |
| 614 | int rc; |
| 615 | |
| 616 | adsp_devices = kzalloc(sizeof(struct adsp_device) * n, GFP_KERNEL); |
| 617 | if (!adsp_devices) |
| 618 | return; |
| 619 | |
| 620 | adsp_class = class_create(THIS_MODULE, "adsp"); |
| 621 | if (IS_ERR(adsp_class)) |
| 622 | goto fail_create_class; |
| 623 | |
| 624 | rc = alloc_chrdev_region(&adsp_devno, 0, n, "adsp"); |
| 625 | if (rc < 0) |
| 626 | goto fail_alloc_region; |
| 627 | |
| 628 | adsp_device_count = n; |
| 629 | for (n = 0; n < adsp_device_count; n++) { |
| 630 | adsp_create(adsp_devices + n, |
| 631 | modules[n].name, &modules[n].pdev.dev, |
| 632 | MKDEV(MAJOR(adsp_devno), n)); |
| 633 | } |
| 634 | |
| 635 | return; |
| 636 | |
| 637 | fail_alloc_region: |
| 638 | class_unregister(adsp_class); |
| 639 | fail_create_class: |
| 640 | kfree(adsp_devices); |
| 641 | } |