include/sound/hdaudio.h

   1 /*
   2  * HD-audio core stuff
   3  */
   4
   5 #ifndef __SOUND_HDAUDIO_H
   6 #define __SOUND_HDAUDIO_H
   7
   8 #include <linux/device.h>
   9 #include <linux/interrupt.h>
  10 #include <linux/timecounter.h>
  11 #include <sound/core.h>
  12 #include <sound/memalloc.h>
  13 #include <sound/hda_verbs.h>
  14 #include <drm/i915_component.h>
  15
  16 /* codec node id */
  17 typedef u16 hda_nid_t;
  18
  19 struct hdac_bus;
  20 struct hdac_stream;
  21 struct hdac_device;
  22 struct hdac_driver;
  23 struct hdac_widget_tree;
  24
  25 /*
  26  * exported bus type
  27  */
  28 extern struct bus_type snd_hda_bus_type;
  29
  30 /*
  31  * HDA device table
  32  */
  33 struct hda_device_id {
  34         __u32 vendor_id;
  35         __u32 rev_id;
  36         const char *name;
  37         unsigned long driver_data;
  38 };
  39
  40 /*
  41  * generic arrays
  42  */
  43 struct snd_array {
  44         unsigned int used;
  45         unsigned int alloced;
  46         unsigned int elem_size;
  47         unsigned int alloc_align;
  48         void *list;
  49 };
  50
  51 /*
  52  * HD-audio codec base device
  53  */
  54 struct hdac_device {
  55         struct device dev;
  56         int type;
  57         struct hdac_bus *bus;
  58         unsigned int addr;              /* codec address */
  59         struct list_head list;          /* list point for bus codec_list */
  60
  61         hda_nid_t afg;                  /* AFG node id */
  62         hda_nid_t mfg;                  /* MFG node id */
  63
  64         /* ids */
  65         unsigned int vendor_id;
  66         unsigned int subsystem_id;
  67         unsigned int revision_id;
  68         unsigned int afg_function_id;
  69         unsigned int mfg_function_id;
  70         unsigned int afg_unsol:1;
  71         unsigned int mfg_unsol:1;
  72
  73         unsigned int power_caps;        /* FG power caps */
  74
  75         const char *vendor_name;        /* codec vendor name */
  76         const char *chip_name;          /* codec chip name */
  77
  78         /* verb exec op override */
  79         int (*exec_verb)(struct hdac_device *dev, unsigned int cmd,
  80                          unsigned int flags, unsigned int *res);
  81
  82         /* widgets */
  83         unsigned int num_nodes;
  84         hda_nid_t start_nid, end_nid;
  85
  86         /* misc flags */
  87         atomic_t in_pm;         /* suspend/resume being performed */
  88         bool  link_power_control:1;
  89
  90         /* sysfs */
  91         struct hdac_widget_tree *widgets;
  92
  93         /* regmap */
  94         struct regmap *regmap;
  95         struct snd_array vendor_verbs;
  96         bool lazy_cache:1;      /* don't wake up for writes */
  97         bool caps_overwriting:1; /* caps overwrite being in process */
  98         bool cache_coef:1;      /* cache COEF read/write too */
  99 };
 100
 101 /* device/driver type used for matching */
 102 enum {
 103         HDA_DEV_CORE,
 104         HDA_DEV_LEGACY,
 105         HDA_DEV_ASOC,
 106 };
 107
 108 /* direction */
 109 enum {
 110         HDA_INPUT, HDA_OUTPUT
 111 };
 112
 113 #define dev_to_hdac_dev(_dev)   container_of(_dev, struct hdac_device, dev)
 114
 115 int snd_hdac_device_init(struct hdac_device *dev, struct hdac_bus *bus,
 116                          const char *name, unsigned int addr);
 117 void snd_hdac_device_exit(struct hdac_device *dev);
 118 int snd_hdac_device_register(struct hdac_device *codec);
 119 void snd_hdac_device_unregister(struct hdac_device *codec);
 120
 121 int snd_hdac_refresh_widgets(struct hdac_device *codec);
 122 int snd_hdac_refresh_widget_sysfs(struct hdac_device *codec);
 123
 124 unsigned int snd_hdac_make_cmd(struct hdac_device *codec, hda_nid_t nid,
 125                                unsigned int verb, unsigned int parm);
 126 int snd_hdac_exec_verb(struct hdac_device *codec, unsigned int cmd,
 127                        unsigned int flags, unsigned int *res);
 128 int snd_hdac_read(struct hdac_device *codec, hda_nid_t nid,
 129                   unsigned int verb, unsigned int parm, unsigned int *res);
 130 int _snd_hdac_read_parm(struct hdac_device *codec, hda_nid_t nid, int parm,
 131                         unsigned int *res);
 132 int snd_hdac_read_parm_uncached(struct hdac_device *codec, hda_nid_t nid,
 133                                 int parm);
 134 int snd_hdac_override_parm(struct hdac_device *codec, hda_nid_t nid,
 135                            unsigned int parm, unsigned int val);
 136 int snd_hdac_get_connections(struct hdac_device *codec, hda_nid_t nid,
 137                              hda_nid_t *conn_list, int max_conns);
 138 int snd_hdac_get_sub_nodes(struct hdac_device *codec, hda_nid_t nid,
 139                            hda_nid_t *start_id);
 140 unsigned int snd_hdac_calc_stream_format(unsigned int rate,
 141                                          unsigned int channels,
 142                                          unsigned int format,
 143                                          unsigned int maxbps,
 144                                          unsigned short spdif_ctls);
 145 int snd_hdac_query_supported_pcm(struct hdac_device *codec, hda_nid_t nid,
 146                                 u32 *ratesp, u64 *formatsp, unsigned int *bpsp);
 147 bool snd_hdac_is_supported_format(struct hdac_device *codec, hda_nid_t nid,
 148                                   unsigned int format);
 149
 150 /**
 151  * snd_hdac_read_parm - read a codec parameter
 152  * @codec: the codec object
 153  * @nid: NID to read a parameter
 154  * @parm: parameter to read
 155  *
 156  * Returns -1 for error.  If you need to distinguish the error more
 157  * strictly, use _snd_hdac_read_parm() directly.
 158  */
 159 static inline int snd_hdac_read_parm(struct hdac_device *codec, hda_nid_t nid,
 160                                      int parm)
 161 {
 162         unsigned int val;
 163
 164         return _snd_hdac_read_parm(codec, nid, parm, &val) < 0 ? -1 : val;
 165 }
 166
 167 #ifdef CONFIG_PM
 168 int snd_hdac_power_up(struct hdac_device *codec);
 169 int snd_hdac_power_down(struct hdac_device *codec);
 170 int snd_hdac_power_up_pm(struct hdac_device *codec);
 171 int snd_hdac_power_down_pm(struct hdac_device *codec);
 172 #else
 173 static inline int snd_hdac_power_up(struct hdac_device *codec) { return 0; }
 174 static inline int snd_hdac_power_down(struct hdac_device *codec) { return 0; }
 175 static inline int snd_hdac_power_up_pm(struct hdac_device *codec) { return 0; }
 176 static inline int snd_hdac_power_down_pm(struct hdac_device *codec) { return 0; }
 177 #endif
 178
 179 /*
 180  * HD-audio codec base driver
 181  */
 182 struct hdac_driver {
 183         struct device_driver driver;
 184         int type;
 185         const struct hda_device_id *id_table;
 186         int (*match)(struct hdac_device *dev, struct hdac_driver *drv);
 187         void (*unsol_event)(struct hdac_device *dev, unsigned int event);
 188 };
 189
 190 #define drv_to_hdac_driver(_drv) container_of(_drv, struct hdac_driver, driver)
 191
 192 const struct hda_device_id *
 193 hdac_get_device_id(struct hdac_device *hdev, struct hdac_driver *drv);
 194
 195 /*
 196  * Bus verb operators
 197  */
 198 struct hdac_bus_ops {
 199         /* send a single command */
 200         int (*command)(struct hdac_bus *bus, unsigned int cmd);
 201         /* get a response from the last command */
 202         int (*get_response)(struct hdac_bus *bus, unsigned int addr,
 203                             unsigned int *res);
 204         /* control the link power  */
 205         int (*link_power)(struct hdac_bus *bus, bool enable);
 206 };
 207
 208 /*
 209  * Lowlevel I/O operators
 210  */
 211 struct hdac_io_ops {
 212         /* mapped register accesses */
 213         void (*reg_writel)(u32 value, u32 __iomem *addr);
 214         u32 (*reg_readl)(u32 __iomem *addr);
 215         void (*reg_writew)(u16 value, u16 __iomem *addr);
 216         u16 (*reg_readw)(u16 __iomem *addr);
 217         void (*reg_writeb)(u8 value, u8 __iomem *addr);
 218         u8 (*reg_readb)(u8 __iomem *addr);
 219         /* Allocation ops */
 220         int (*dma_alloc_pages)(struct hdac_bus *bus, int type, size_t size,
 221                                struct snd_dma_buffer *buf);
 222         void (*dma_free_pages)(struct hdac_bus *bus,
 223                                struct snd_dma_buffer *buf);
 224 };
 225
 226 #define HDA_UNSOL_QUEUE_SIZE    64
 227 #define HDA_MAX_CODECS          8       /* limit by controller side */
 228
 229 /* HD Audio class code */
 230 #define PCI_CLASS_MULTIMEDIA_HD_AUDIO   0x0403
 231
 232 /*
 233  * CORB/RIRB
 234  *
 235  * Each CORB entry is 4byte, RIRB is 8byte
 236  */
 237 struct hdac_rb {
 238         __le32 *buf;            /* virtual address of CORB/RIRB buffer */
 239         dma_addr_t addr;        /* physical address of CORB/RIRB buffer */
 240         unsigned short rp, wp;  /* RIRB read/write pointers */
 241         int cmds[HDA_MAX_CODECS];       /* number of pending requests */
 242         u32 res[HDA_MAX_CODECS];        /* last read value */
 243 };
 244
 245 /*
 246  * HD-audio bus base driver
 247  */
 248 struct hdac_bus {
 249         struct device *dev;
 250         const struct hdac_bus_ops *ops;
 251         const struct hdac_io_ops *io_ops;
 252
 253         /* h/w resources */
 254         unsigned long addr;
 255         void __iomem *remap_addr;
 256         int irq;
 257
 258         /* codec linked list */
 259         struct list_head codec_list;
 260         unsigned int num_codecs;
 261
 262         /* link caddr -> codec */
 263         struct hdac_device *caddr_tbl[HDA_MAX_CODEC_ADDRESS + 1];
 264
 265         /* unsolicited event queue */
 266         u32 unsol_queue[HDA_UNSOL_QUEUE_SIZE * 2]; /* ring buffer */
 267         unsigned int unsol_rp, unsol_wp;
 268         struct work_struct unsol_work;
 269
 270         /* bit flags of detected codecs */
 271         unsigned long codec_mask;
 272
 273         /* bit flags of powered codecs */
 274         unsigned long codec_powered;
 275
 276         /* CORB/RIRB */
 277         struct hdac_rb corb;
 278         struct hdac_rb rirb;
 279         unsigned int last_cmd[HDA_MAX_CODECS];  /* last sent command */
 280
 281         /* CORB/RIRB and position buffers */
 282         struct snd_dma_buffer rb;
 283         struct snd_dma_buffer posbuf;
 284
 285         /* hdac_stream linked list */
 286         struct list_head stream_list;
 287
 288         /* operation state */
 289         bool chip_init:1;               /* h/w initialized */
 290
 291         /* behavior flags */
 292         bool sync_write:1;              /* sync after verb write */
 293         bool use_posbuf:1;              /* use position buffer */
 294         bool snoop:1;                   /* enable snooping */
 295         bool align_bdle_4k:1;           /* BDLE align 4K boundary */
 296         bool reverse_assign:1;          /* assign devices in reverse order */
 297         bool corbrp_self_clear:1;       /* CORBRP clears itself after reset */
 298
 299         int bdl_pos_adj;                /* BDL position adjustment */
 300
 301         /* locks */
 302         spinlock_t reg_lock;
 303         struct mutex cmd_mutex;
 304
 305         /* i915 component interface */
 306         struct i915_audio_component *audio_component;
 307         int i915_power_refcount;
 308 };
 309
 310 int snd_hdac_bus_init(struct hdac_bus *bus, struct device *dev,
 311                       const struct hdac_bus_ops *ops,
 312                       const struct hdac_io_ops *io_ops);
 313 void snd_hdac_bus_exit(struct hdac_bus *bus);
 314 int snd_hdac_bus_exec_verb(struct hdac_bus *bus, unsigned int addr,
 315                            unsigned int cmd, unsigned int *res);
 316 int snd_hdac_bus_exec_verb_unlocked(struct hdac_bus *bus, unsigned int addr,
 317                                     unsigned int cmd, unsigned int *res);
 318 void snd_hdac_bus_queue_event(struct hdac_bus *bus, u32 res, u32 res_ex);
 319
 320 int snd_hdac_bus_add_device(struct hdac_bus *bus, struct hdac_device *codec);
 321 void snd_hdac_bus_remove_device(struct hdac_bus *bus,
 322                                 struct hdac_device *codec);
 323
 324 static inline void snd_hdac_codec_link_up(struct hdac_device *codec)
 325 {
 326         set_bit(codec->addr, &codec->bus->codec_powered);
 327 }
 328
 329 static inline void snd_hdac_codec_link_down(struct hdac_device *codec)
 330 {
 331         clear_bit(codec->addr, &codec->bus->codec_powered);
 332 }
 333
 334 int snd_hdac_bus_send_cmd(struct hdac_bus *bus, unsigned int val);
 335 int snd_hdac_bus_get_response(struct hdac_bus *bus, unsigned int addr,
 336                               unsigned int *res);
 337 int snd_hdac_link_power(struct hdac_device *codec, bool enable);
 338
 339 bool snd_hdac_bus_init_chip(struct hdac_bus *bus, bool full_reset);
 340 void snd_hdac_bus_stop_chip(struct hdac_bus *bus);
 341 void snd_hdac_bus_init_cmd_io(struct hdac_bus *bus);
 342 void snd_hdac_bus_stop_cmd_io(struct hdac_bus *bus);
 343 void snd_hdac_bus_enter_link_reset(struct hdac_bus *bus);
 344 void snd_hdac_bus_exit_link_reset(struct hdac_bus *bus);
 345
 346 void snd_hdac_bus_update_rirb(struct hdac_bus *bus);
 347 void snd_hdac_bus_handle_stream_irq(struct hdac_bus *bus, unsigned int status,
 348                                     void (*ack)(struct hdac_bus *,
 349                                                 struct hdac_stream *));
 350
 351 int snd_hdac_bus_alloc_stream_pages(struct hdac_bus *bus);
 352 void snd_hdac_bus_free_stream_pages(struct hdac_bus *bus);
 353
 354 /*
 355  * macros for easy use
 356  */
 357 #define _snd_hdac_chip_write(type, chip, reg, value) \
 358         ((chip)->io_ops->reg_write ## type(value, (chip)->remap_addr + (reg)))
 359 #define _snd_hdac_chip_read(type, chip, reg) \
 360         ((chip)->io_ops->reg_read ## type((chip)->remap_addr + (reg)))
 361
 362 /* read/write a register, pass without AZX_REG_ prefix */
 363 #define snd_hdac_chip_writel(chip, reg, value) \
 364         _snd_hdac_chip_write(l, chip, AZX_REG_ ## reg, value)
 365 #define snd_hdac_chip_writew(chip, reg, value) \
 366         _snd_hdac_chip_write(w, chip, AZX_REG_ ## reg, value)
 367 #define snd_hdac_chip_writeb(chip, reg, value) \
 368         _snd_hdac_chip_write(b, chip, AZX_REG_ ## reg, value)
 369 #define snd_hdac_chip_readl(chip, reg) \
 370         _snd_hdac_chip_read(l, chip, AZX_REG_ ## reg)
 371 #define snd_hdac_chip_readw(chip, reg) \
 372         _snd_hdac_chip_read(w, chip, AZX_REG_ ## reg)
 373 #define snd_hdac_chip_readb(chip, reg) \
 374         _snd_hdac_chip_read(b, chip, AZX_REG_ ## reg)
 375
 376 /* update a register, pass without AZX_REG_ prefix */
 377 #define snd_hdac_chip_updatel(chip, reg, mask, val) \
 378         snd_hdac_chip_writel(chip, reg, \
 379                              (snd_hdac_chip_readl(chip, reg) & ~(mask)) | (val))
 380 #define snd_hdac_chip_updatew(chip, reg, mask, val) \
 381         snd_hdac_chip_writew(chip, reg, \
 382                              (snd_hdac_chip_readw(chip, reg) & ~(mask)) | (val))
 383 #define snd_hdac_chip_updateb(chip, reg, mask, val) \
 384         snd_hdac_chip_writeb(chip, reg, \
 385                              (snd_hdac_chip_readb(chip, reg) & ~(mask)) | (val))
 386
 387 /*
 388  * HD-audio stream
 389  */
 390 struct hdac_stream {
 391         struct hdac_bus *bus;
 392         struct snd_dma_buffer bdl; /* BDL buffer */
 393         __le32 *posbuf;         /* position buffer pointer */
 394         int direction;          /* playback / capture (SNDRV_PCM_STREAM_*) */
 395
 396         unsigned int bufsize;   /* size of the play buffer in bytes */
 397         unsigned int period_bytes; /* size of the period in bytes */
 398         unsigned int frags;     /* number for period in the play buffer */
 399         unsigned int fifo_size; /* FIFO size */
 400
 401         void __iomem *sd_addr;  /* stream descriptor pointer */
 402
 403         u32 sd_int_sta_mask;    /* stream int status mask */
 404
 405         /* pcm support */
 406         struct snd_pcm_substream *substream;    /* assigned substream,
 407                                                  * set in PCM open
 408                                                  */
 409         unsigned int format_val;        /* format value to be set in the
 410                                          * controller and the codec
 411                                          */
 412         unsigned char stream_tag;       /* assigned stream */
 413         unsigned char index;            /* stream index */
 414         int assigned_key;               /* last device# key assigned to */
 415
 416         bool opened:1;
 417         bool running:1;
 418         bool prepared:1;
 419         bool no_period_wakeup:1;
 420         bool locked:1;
 421
 422         /* timestamp */
 423         unsigned long start_wallclk;    /* start + minimum wallclk */
 424         unsigned long period_wallclk;   /* wallclk for period */
 425         struct timecounter  tc;
 426         struct cyclecounter cc;
 427         int delay_negative_threshold;
 428
 429         struct list_head list;
 430 #ifdef CONFIG_SND_HDA_DSP_LOADER
 431         /* DSP access mutex */
 432         struct mutex dsp_mutex;
 433 #endif
 434 };
 435
 436 void snd_hdac_stream_init(struct hdac_bus *bus, struct hdac_stream *azx_dev,
 437                           int idx, int direction, int tag);
 438 struct hdac_stream *snd_hdac_stream_assign(struct hdac_bus *bus,
 439                                            struct snd_pcm_substream *substream);
 440 void snd_hdac_stream_release(struct hdac_stream *azx_dev);
 441
 442 int snd_hdac_stream_setup(struct hdac_stream *azx_dev);
 443 void snd_hdac_stream_cleanup(struct hdac_stream *azx_dev);
 444 int snd_hdac_stream_setup_periods(struct hdac_stream *azx_dev);
 445 int snd_hdac_stream_set_params(struct hdac_stream *azx_dev,
 446                                 unsigned int format_val);
 447 void snd_hdac_stream_start(struct hdac_stream *azx_dev, bool fresh_start);
 448 void snd_hdac_stream_clear(struct hdac_stream *azx_dev);
 449 void snd_hdac_stream_stop(struct hdac_stream *azx_dev);
 450 void snd_hdac_stream_reset(struct hdac_stream *azx_dev);
 451 void snd_hdac_stream_sync_trigger(struct hdac_stream *azx_dev, bool set,
 452                                   unsigned int streams, unsigned int reg);
 453 void snd_hdac_stream_sync(struct hdac_stream *azx_dev, bool start,
 454                           unsigned int streams);
 455 void snd_hdac_stream_timecounter_init(struct hdac_stream *azx_dev,
 456                                       unsigned int streams);
 457 /*
 458  * macros for easy use
 459  */
 460 #define _snd_hdac_stream_write(type, dev, reg, value)                   \
 461         ((dev)->bus->io_ops->reg_write ## type(value, (dev)->sd_addr + (reg)))
 462 #define _snd_hdac_stream_read(type, dev, reg)                           \
 463         ((dev)->bus->io_ops->reg_read ## type((dev)->sd_addr + (reg)))
 464
 465 /* read/write a register, pass without AZX_REG_ prefix */
 466 #define snd_hdac_stream_writel(dev, reg, value) \
 467         _snd_hdac_stream_write(l, dev, AZX_REG_ ## reg, value)
 468 #define snd_hdac_stream_writew(dev, reg, value) \
 469         _snd_hdac_stream_write(w, dev, AZX_REG_ ## reg, value)
 470 #define snd_hdac_stream_writeb(dev, reg, value) \
 471         _snd_hdac_stream_write(b, dev, AZX_REG_ ## reg, value)
 472 #define snd_hdac_stream_readl(dev, reg) \
 473         _snd_hdac_stream_read(l, dev, AZX_REG_ ## reg)
 474 #define snd_hdac_stream_readw(dev, reg) \
 475         _snd_hdac_stream_read(w, dev, AZX_REG_ ## reg)
 476 #define snd_hdac_stream_readb(dev, reg) \
 477         _snd_hdac_stream_read(b, dev, AZX_REG_ ## reg)
 478
 479 /* update a register, pass without AZX_REG_ prefix */
 480 #define snd_hdac_stream_updatel(dev, reg, mask, val) \
 481         snd_hdac_stream_writel(dev, reg, \
 482                                (snd_hdac_stream_readl(dev, reg) & \
 483                                 ~(mask)) | (val))
 484 #define snd_hdac_stream_updatew(dev, reg, mask, val) \
 485         snd_hdac_stream_writew(dev, reg, \
 486                                (snd_hdac_stream_readw(dev, reg) & \
 487                                 ~(mask)) | (val))
 488 #define snd_hdac_stream_updateb(dev, reg, mask, val) \
 489         snd_hdac_stream_writeb(dev, reg, \
 490                                (snd_hdac_stream_readb(dev, reg) & \
 491                                 ~(mask)) | (val))
 492
 493 #ifdef CONFIG_SND_HDA_DSP_LOADER
 494 /* DSP lock helpers */
 495 #define snd_hdac_dsp_lock_init(dev)     mutex_init(&(dev)->dsp_mutex)
 496 #define snd_hdac_dsp_lock(dev)          mutex_lock(&(dev)->dsp_mutex)
 497 #define snd_hdac_dsp_unlock(dev)        mutex_unlock(&(dev)->dsp_mutex)
 498 #define snd_hdac_stream_is_locked(dev)  ((dev)->locked)
 499 /* DSP loader helpers */
 500 int snd_hdac_dsp_prepare(struct hdac_stream *azx_dev, unsigned int format,
 501                          unsigned int byte_size, struct snd_dma_buffer *bufp);
 502 void snd_hdac_dsp_trigger(struct hdac_stream *azx_dev, bool start);
 503 void snd_hdac_dsp_cleanup(struct hdac_stream *azx_dev,
 504                           struct snd_dma_buffer *dmab);
 505 #else /* CONFIG_SND_HDA_DSP_LOADER */
 506 #define snd_hdac_dsp_lock_init(dev)     do {} while (0)
 507 #define snd_hdac_dsp_lock(dev)          do {} while (0)
 508 #define snd_hdac_dsp_unlock(dev)        do {} while (0)
 509 #define snd_hdac_stream_is_locked(dev)  0
 510
 511 static inline int
 512 snd_hdac_dsp_prepare(struct hdac_stream *azx_dev, unsigned int format,
 513                      unsigned int byte_size, struct snd_dma_buffer *bufp)
 514 {
 515         return 0;
 516 }
 517
 518 static inline void snd_hdac_dsp_trigger(struct hdac_stream *azx_dev, bool start)
 519 {
 520 }
 521
 522 static inline void snd_hdac_dsp_cleanup(struct hdac_stream *azx_dev,
 523                                         struct snd_dma_buffer *dmab)
 524 {
 525 }
 526 #endif /* CONFIG_SND_HDA_DSP_LOADER */
 527
 528
 529 /*
 530  * generic array helpers
 531  */
 532 void *snd_array_new(struct snd_array *array);
 533 void snd_array_free(struct snd_array *array);
 534 static inline void snd_array_init(struct snd_array *array, unsigned int size,
 535                                   unsigned int align)
 536 {
 537         array->elem_size = size;
 538         array->alloc_align = align;
 539 }
 540
 541 static inline void *snd_array_elem(struct snd_array *array, unsigned int idx)
 542 {
 543         return array->list + idx * array->elem_size;
 544 }
 545
 546 static inline unsigned int snd_array_index(struct snd_array *array, void *ptr)
 547 {
 548         return (unsigned long)(ptr - array->list) / array->elem_size;
 549 }
 550
 551 #endif /* __SOUND_HDAUDIO_H */