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