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TOMOYO Linux Cross Reference
Linux/include/sound/hdaudio.h

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  1 /* SPDX-License-Identifier: GPL-2.0 */
  2 /*
  3  * HD-audio core stuff
  4  */
  5 
  6 #ifndef __SOUND_HDAUDIO_H
  7 #define __SOUND_HDAUDIO_H
  8 
  9 #include <linux/device.h>
 10 #include <linux/interrupt.h>
 11 #include <linux/timecounter.h>
 12 #include <sound/core.h>
 13 #include <sound/memalloc.h>
 14 #include <sound/hda_verbs.h>
 15 #include <drm/i915_component.h>
 16 
 17 /* codec node id */
 18 typedef u16 hda_nid_t;
 19 
 20 struct hdac_bus;
 21 struct hdac_stream;
 22 struct hdac_device;
 23 struct hdac_driver;
 24 struct hdac_widget_tree;
 25 struct hda_device_id;
 26 
 27 /*
 28  * exported bus type
 29  */
 30 extern struct bus_type snd_hda_bus_type;
 31 
 32 /*
 33  * generic arrays
 34  */
 35 struct snd_array {
 36         unsigned int used;
 37         unsigned int alloced;
 38         unsigned int elem_size;
 39         unsigned int alloc_align;
 40         void *list;
 41 };
 42 
 43 /*
 44  * HD-audio codec base device
 45  */
 46 struct hdac_device {
 47         struct device dev;
 48         int type;
 49         struct hdac_bus *bus;
 50         unsigned int addr;              /* codec address */
 51         struct list_head list;          /* list point for bus codec_list */
 52 
 53         hda_nid_t afg;                  /* AFG node id */
 54         hda_nid_t mfg;                  /* MFG node id */
 55 
 56         /* ids */
 57         unsigned int vendor_id;
 58         unsigned int subsystem_id;
 59         unsigned int revision_id;
 60         unsigned int afg_function_id;
 61         unsigned int mfg_function_id;
 62         unsigned int afg_unsol:1;
 63         unsigned int mfg_unsol:1;
 64 
 65         unsigned int power_caps;        /* FG power caps */
 66 
 67         const char *vendor_name;        /* codec vendor name */
 68         const char *chip_name;          /* codec chip name */
 69 
 70         /* verb exec op override */
 71         int (*exec_verb)(struct hdac_device *dev, unsigned int cmd,
 72                          unsigned int flags, unsigned int *res);
 73 
 74         /* widgets */
 75         unsigned int num_nodes;
 76         hda_nid_t start_nid, end_nid;
 77 
 78         /* misc flags */
 79         atomic_t in_pm;         /* suspend/resume being performed */
 80         bool  link_power_control:1;
 81 
 82         /* sysfs */
 83         struct hdac_widget_tree *widgets;
 84 
 85         /* regmap */
 86         struct regmap *regmap;
 87         struct snd_array vendor_verbs;
 88         bool lazy_cache:1;      /* don't wake up for writes */
 89         bool caps_overwriting:1; /* caps overwrite being in process */
 90         bool cache_coef:1;      /* cache COEF read/write too */
 91 };
 92 
 93 /* device/driver type used for matching */
 94 enum {
 95         HDA_DEV_CORE,
 96         HDA_DEV_LEGACY,
 97         HDA_DEV_ASOC,
 98 };
 99 
100 /* direction */
101 enum {
102         HDA_INPUT, HDA_OUTPUT
103 };
104 
105 #define dev_to_hdac_dev(_dev)   container_of(_dev, struct hdac_device, dev)
106 
107 int snd_hdac_device_init(struct hdac_device *dev, struct hdac_bus *bus,
108                          const char *name, unsigned int addr);
109 void snd_hdac_device_exit(struct hdac_device *dev);
110 int snd_hdac_device_register(struct hdac_device *codec);
111 void snd_hdac_device_unregister(struct hdac_device *codec);
112 int snd_hdac_device_set_chip_name(struct hdac_device *codec, const char *name);
113 int snd_hdac_codec_modalias(struct hdac_device *hdac, char *buf, size_t size);
114 
115 int snd_hdac_refresh_widgets(struct hdac_device *codec, bool sysfs);
116 
117 unsigned int snd_hdac_make_cmd(struct hdac_device *codec, hda_nid_t nid,
118                                unsigned int verb, unsigned int parm);
119 int snd_hdac_exec_verb(struct hdac_device *codec, unsigned int cmd,
120                        unsigned int flags, unsigned int *res);
121 int snd_hdac_read(struct hdac_device *codec, hda_nid_t nid,
122                   unsigned int verb, unsigned int parm, unsigned int *res);
123 int _snd_hdac_read_parm(struct hdac_device *codec, hda_nid_t nid, int parm,
124                         unsigned int *res);
125 int snd_hdac_read_parm_uncached(struct hdac_device *codec, hda_nid_t nid,
126                                 int parm);
127 int snd_hdac_override_parm(struct hdac_device *codec, hda_nid_t nid,
128                            unsigned int parm, unsigned int val);
129 int snd_hdac_get_connections(struct hdac_device *codec, hda_nid_t nid,
130                              hda_nid_t *conn_list, int max_conns);
131 int snd_hdac_get_sub_nodes(struct hdac_device *codec, hda_nid_t nid,
132                            hda_nid_t *start_id);
133 unsigned int snd_hdac_calc_stream_format(unsigned int rate,
134                                          unsigned int channels,
135                                          unsigned int format,
136                                          unsigned int maxbps,
137                                          unsigned short spdif_ctls);
138 int snd_hdac_query_supported_pcm(struct hdac_device *codec, hda_nid_t nid,
139                                 u32 *ratesp, u64 *formatsp, unsigned int *bpsp);
140 bool snd_hdac_is_supported_format(struct hdac_device *codec, hda_nid_t nid,
141                                   unsigned int format);
142 
143 int snd_hdac_codec_read(struct hdac_device *hdac, hda_nid_t nid,
144                         int flags, unsigned int verb, unsigned int parm);
145 int snd_hdac_codec_write(struct hdac_device *hdac, hda_nid_t nid,
146                         int flags, unsigned int verb, unsigned int parm);
147 bool snd_hdac_check_power_state(struct hdac_device *hdac,
148                 hda_nid_t nid, unsigned int target_state);
149 unsigned int snd_hdac_sync_power_state(struct hdac_device *hdac,
150                       hda_nid_t nid, unsigned int target_state);
151 /**
152  * snd_hdac_read_parm - read a codec parameter
153  * @codec: the codec object
154  * @nid: NID to read a parameter
155  * @parm: parameter to read
156  *
157  * Returns -1 for error.  If you need to distinguish the error more
158  * strictly, use _snd_hdac_read_parm() directly.
159  */
160 static inline int snd_hdac_read_parm(struct hdac_device *codec, hda_nid_t nid,
161                                      int parm)
162 {
163         unsigned int val;
164 
165         return _snd_hdac_read_parm(codec, nid, parm, &val) < 0 ? -1 : val;
166 }
167 
168 #ifdef CONFIG_PM
169 int snd_hdac_power_up(struct hdac_device *codec);
170 int snd_hdac_power_down(struct hdac_device *codec);
171 int snd_hdac_power_up_pm(struct hdac_device *codec);
172 int snd_hdac_power_down_pm(struct hdac_device *codec);
173 int snd_hdac_keep_power_up(struct hdac_device *codec);
174 #else
175 static inline int snd_hdac_power_up(struct hdac_device *codec) { return 0; }
176 static inline int snd_hdac_power_down(struct hdac_device *codec) { return 0; }
177 static inline int snd_hdac_power_up_pm(struct hdac_device *codec) { return 0; }
178 static inline int snd_hdac_power_down_pm(struct hdac_device *codec) { return 0; }
179 static inline int snd_hdac_keep_power_up(struct hdac_device *codec) { return 0; }
180 #endif
181 
182 /*
183  * HD-audio codec base driver
184  */
185 struct hdac_driver {
186         struct device_driver driver;
187         int type;
188         const struct hda_device_id *id_table;
189         int (*match)(struct hdac_device *dev, struct hdac_driver *drv);
190         void (*unsol_event)(struct hdac_device *dev, unsigned int event);
191 };
192 
193 #define drv_to_hdac_driver(_drv) container_of(_drv, struct hdac_driver, driver)
194 
195 const struct hda_device_id *
196 hdac_get_device_id(struct hdac_device *hdev, struct hdac_driver *drv);
197 
198 /*
199  * Bus verb operators
200  */
201 struct hdac_bus_ops {
202         /* send a single command */
203         int (*command)(struct hdac_bus *bus, unsigned int cmd);
204         /* get a response from the last command */
205         int (*get_response)(struct hdac_bus *bus, unsigned int addr,
206                             unsigned int *res);
207         /* control the link power  */
208         int (*link_power)(struct hdac_bus *bus, bool enable);
209 };
210 
211 /*
212  * Lowlevel I/O operators
213  */
214 struct hdac_io_ops {
215         /* mapped register accesses */
216         void (*reg_writel)(u32 value, u32 __iomem *addr);
217         u32 (*reg_readl)(u32 __iomem *addr);
218         void (*reg_writew)(u16 value, u16 __iomem *addr);
219         u16 (*reg_readw)(u16 __iomem *addr);
220         void (*reg_writeb)(u8 value, u8 __iomem *addr);
221         u8 (*reg_readb)(u8 __iomem *addr);
222         /* Allocation ops */
223         int (*dma_alloc_pages)(struct hdac_bus *bus, int type, size_t size,
224                                struct snd_dma_buffer *buf);
225         void (*dma_free_pages)(struct hdac_bus *bus,
226                                struct snd_dma_buffer *buf);
227 };
228 
229 #define HDA_UNSOL_QUEUE_SIZE    64
230 #define HDA_MAX_CODECS          8       /* limit by controller side */
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  * @ppcap: pp capabilities pointer
249  * @spbcap: SPIB capabilities pointer
250  * @mlcap: MultiLink capabilities pointer
251  * @gtscap: gts capabilities pointer
252  * @drsmcap: dma resume capabilities pointer
253  */
254 struct hdac_bus {
255         struct device *dev;
256         const struct hdac_bus_ops *ops;
257         const struct hdac_io_ops *io_ops;
258 
259         /* h/w resources */
260         unsigned long addr;
261         void __iomem *remap_addr;
262         int irq;
263 
264         void __iomem *ppcap;
265         void __iomem *spbcap;
266         void __iomem *mlcap;
267         void __iomem *gtscap;
268         void __iomem *drsmcap;
269 
270         /* codec linked list */
271         struct list_head codec_list;
272         unsigned int num_codecs;
273 
274         /* link caddr -> codec */
275         struct hdac_device *caddr_tbl[HDA_MAX_CODEC_ADDRESS + 1];
276 
277         /* unsolicited event queue */
278         u32 unsol_queue[HDA_UNSOL_QUEUE_SIZE * 2]; /* ring buffer */
279         unsigned int unsol_rp, unsol_wp;
280         struct work_struct unsol_work;
281 
282         /* bit flags of detected codecs */
283         unsigned long codec_mask;
284 
285         /* bit flags of powered codecs */
286         unsigned long codec_powered;
287 
288         /* CORB/RIRB */
289         struct hdac_rb corb;
290         struct hdac_rb rirb;
291         unsigned int last_cmd[HDA_MAX_CODECS];  /* last sent command */
292 
293         /* CORB/RIRB and position buffers */
294         struct snd_dma_buffer rb;
295         struct snd_dma_buffer posbuf;
296 
297         /* hdac_stream linked list */
298         struct list_head stream_list;
299 
300         /* operation state */
301         bool chip_init:1;               /* h/w initialized */
302 
303         /* behavior flags */
304         bool sync_write:1;              /* sync after verb write */
305         bool use_posbuf:1;              /* use position buffer */
306         bool snoop:1;                   /* enable snooping */
307         bool align_bdle_4k:1;           /* BDLE align 4K boundary */
308         bool reverse_assign:1;          /* assign devices in reverse order */
309         bool corbrp_self_clear:1;       /* CORBRP clears itself after reset */
310 
311         int bdl_pos_adj;                /* BDL position adjustment */
312 
313         /* locks */
314         spinlock_t reg_lock;
315         struct mutex cmd_mutex;
316 
317         /* i915 component interface */
318         struct i915_audio_component *audio_component;
319         int i915_power_refcount;
320 };
321 
322 int snd_hdac_bus_init(struct hdac_bus *bus, struct device *dev,
323                       const struct hdac_bus_ops *ops,
324                       const struct hdac_io_ops *io_ops);
325 void snd_hdac_bus_exit(struct hdac_bus *bus);
326 int snd_hdac_bus_exec_verb(struct hdac_bus *bus, unsigned int addr,
327                            unsigned int cmd, unsigned int *res);
328 int snd_hdac_bus_exec_verb_unlocked(struct hdac_bus *bus, unsigned int addr,
329                                     unsigned int cmd, unsigned int *res);
330 void snd_hdac_bus_queue_event(struct hdac_bus *bus, u32 res, u32 res_ex);
331 
332 int snd_hdac_bus_add_device(struct hdac_bus *bus, struct hdac_device *codec);
333 void snd_hdac_bus_remove_device(struct hdac_bus *bus,
334                                 struct hdac_device *codec);
335 
336 static inline void snd_hdac_codec_link_up(struct hdac_device *codec)
337 {
338         set_bit(codec->addr, &codec->bus->codec_powered);
339 }
340 
341 static inline void snd_hdac_codec_link_down(struct hdac_device *codec)
342 {
343         clear_bit(codec->addr, &codec->bus->codec_powered);
344 }
345 
346 int snd_hdac_bus_send_cmd(struct hdac_bus *bus, unsigned int val);
347 int snd_hdac_bus_get_response(struct hdac_bus *bus, unsigned int addr,
348                               unsigned int *res);
349 int snd_hdac_bus_parse_capabilities(struct hdac_bus *bus);
350 int snd_hdac_link_power(struct hdac_device *codec, bool enable);
351 
352 bool snd_hdac_bus_init_chip(struct hdac_bus *bus, bool full_reset);
353 void snd_hdac_bus_stop_chip(struct hdac_bus *bus);
354 void snd_hdac_bus_init_cmd_io(struct hdac_bus *bus);
355 void snd_hdac_bus_stop_cmd_io(struct hdac_bus *bus);
356 void snd_hdac_bus_enter_link_reset(struct hdac_bus *bus);
357 void snd_hdac_bus_exit_link_reset(struct hdac_bus *bus);
358 int snd_hdac_bus_reset_link(struct hdac_bus *bus, bool full_reset);
359 
360 void snd_hdac_bus_update_rirb(struct hdac_bus *bus);
361 int snd_hdac_bus_handle_stream_irq(struct hdac_bus *bus, unsigned int status,
362                                     void (*ack)(struct hdac_bus *,
363                                                 struct hdac_stream *));
364 
365 int snd_hdac_bus_alloc_stream_pages(struct hdac_bus *bus);
366 void snd_hdac_bus_free_stream_pages(struct hdac_bus *bus);
367 
368 /*
369  * macros for easy use
370  */
371 #define _snd_hdac_chip_writeb(chip, reg, value) \
372         ((chip)->io_ops->reg_writeb(value, (chip)->remap_addr + (reg)))
373 #define _snd_hdac_chip_readb(chip, reg) \
374         ((chip)->io_ops->reg_readb((chip)->remap_addr + (reg)))
375 #define _snd_hdac_chip_writew(chip, reg, value) \
376         ((chip)->io_ops->reg_writew(value, (chip)->remap_addr + (reg)))
377 #define _snd_hdac_chip_readw(chip, reg) \
378         ((chip)->io_ops->reg_readw((chip)->remap_addr + (reg)))
379 #define _snd_hdac_chip_writel(chip, reg, value) \
380         ((chip)->io_ops->reg_writel(value, (chip)->remap_addr + (reg)))
381 #define _snd_hdac_chip_readl(chip, reg) \
382         ((chip)->io_ops->reg_readl((chip)->remap_addr + (reg)))
383 
384 /* read/write a register, pass without AZX_REG_ prefix */
385 #define snd_hdac_chip_writel(chip, reg, value) \
386         _snd_hdac_chip_writel(chip, AZX_REG_ ## reg, value)
387 #define snd_hdac_chip_writew(chip, reg, value) \
388         _snd_hdac_chip_writew(chip, AZX_REG_ ## reg, value)
389 #define snd_hdac_chip_writeb(chip, reg, value) \
390         _snd_hdac_chip_writeb(chip, AZX_REG_ ## reg, value)
391 #define snd_hdac_chip_readl(chip, reg) \
392         _snd_hdac_chip_readl(chip, AZX_REG_ ## reg)
393 #define snd_hdac_chip_readw(chip, reg) \
394         _snd_hdac_chip_readw(chip, AZX_REG_ ## reg)
395 #define snd_hdac_chip_readb(chip, reg) \
396         _snd_hdac_chip_readb(chip, AZX_REG_ ## reg)
397 
398 /* update a register, pass without AZX_REG_ prefix */
399 #define snd_hdac_chip_updatel(chip, reg, mask, val) \
400         snd_hdac_chip_writel(chip, reg, \
401                              (snd_hdac_chip_readl(chip, reg) & ~(mask)) | (val))
402 #define snd_hdac_chip_updatew(chip, reg, mask, val) \
403         snd_hdac_chip_writew(chip, reg, \
404                              (snd_hdac_chip_readw(chip, reg) & ~(mask)) | (val))
405 #define snd_hdac_chip_updateb(chip, reg, mask, val) \
406         snd_hdac_chip_writeb(chip, reg, \
407                              (snd_hdac_chip_readb(chip, reg) & ~(mask)) | (val))
408 
409 /*
410  * HD-audio stream
411  */
412 struct hdac_stream {
413         struct hdac_bus *bus;
414         struct snd_dma_buffer bdl; /* BDL buffer */
415         __le32 *posbuf;         /* position buffer pointer */
416         int direction;          /* playback / capture (SNDRV_PCM_STREAM_*) */
417 
418         unsigned int bufsize;   /* size of the play buffer in bytes */
419         unsigned int period_bytes; /* size of the period in bytes */
420         unsigned int frags;     /* number for period in the play buffer */
421         unsigned int fifo_size; /* FIFO size */
422 
423         void __iomem *sd_addr;  /* stream descriptor pointer */
424 
425         u32 sd_int_sta_mask;    /* stream int status mask */
426 
427         /* pcm support */
428         struct snd_pcm_substream *substream;    /* assigned substream,
429                                                  * set in PCM open
430                                                  */
431         unsigned int format_val;        /* format value to be set in the
432                                          * controller and the codec
433                                          */
434         unsigned char stream_tag;       /* assigned stream */
435         unsigned char index;            /* stream index */
436         int assigned_key;               /* last device# key assigned to */
437 
438         bool opened:1;
439         bool running:1;
440         bool prepared:1;
441         bool no_period_wakeup:1;
442         bool locked:1;
443 
444         /* timestamp */
445         unsigned long start_wallclk;    /* start + minimum wallclk */
446         unsigned long period_wallclk;   /* wallclk for period */
447         struct timecounter  tc;
448         struct cyclecounter cc;
449         int delay_negative_threshold;
450 
451         struct list_head list;
452 #ifdef CONFIG_SND_HDA_DSP_LOADER
453         /* DSP access mutex */
454         struct mutex dsp_mutex;
455 #endif
456 };
457 
458 void snd_hdac_stream_init(struct hdac_bus *bus, struct hdac_stream *azx_dev,
459                           int idx, int direction, int tag);
460 struct hdac_stream *snd_hdac_stream_assign(struct hdac_bus *bus,
461                                            struct snd_pcm_substream *substream);
462 void snd_hdac_stream_release(struct hdac_stream *azx_dev);
463 struct hdac_stream *snd_hdac_get_stream(struct hdac_bus *bus,
464                                         int dir, int stream_tag);
465 
466 int snd_hdac_stream_setup(struct hdac_stream *azx_dev);
467 void snd_hdac_stream_cleanup(struct hdac_stream *azx_dev);
468 int snd_hdac_stream_setup_periods(struct hdac_stream *azx_dev);
469 int snd_hdac_stream_set_params(struct hdac_stream *azx_dev,
470                                 unsigned int format_val);
471 void snd_hdac_stream_start(struct hdac_stream *azx_dev, bool fresh_start);
472 void snd_hdac_stream_clear(struct hdac_stream *azx_dev);
473 void snd_hdac_stream_stop(struct hdac_stream *azx_dev);
474 void snd_hdac_stream_reset(struct hdac_stream *azx_dev);
475 void snd_hdac_stream_sync_trigger(struct hdac_stream *azx_dev, bool set,
476                                   unsigned int streams, unsigned int reg);
477 void snd_hdac_stream_sync(struct hdac_stream *azx_dev, bool start,
478                           unsigned int streams);
479 void snd_hdac_stream_timecounter_init(struct hdac_stream *azx_dev,
480                                       unsigned int streams);
481 /*
482  * macros for easy use
483  */
484 #define _snd_hdac_stream_write(type, dev, reg, value)                   \
485         ((dev)->bus->io_ops->reg_write ## type(value, (dev)->sd_addr + (reg)))
486 #define _snd_hdac_stream_read(type, dev, reg)                           \
487         ((dev)->bus->io_ops->reg_read ## type((dev)->sd_addr + (reg)))
488 
489 /* read/write a register, pass without AZX_REG_ prefix */
490 #define snd_hdac_stream_writel(dev, reg, value) \
491         _snd_hdac_stream_write(l, dev, AZX_REG_ ## reg, value)
492 #define snd_hdac_stream_writew(dev, reg, value) \
493         _snd_hdac_stream_write(w, dev, AZX_REG_ ## reg, value)
494 #define snd_hdac_stream_writeb(dev, reg, value) \
495         _snd_hdac_stream_write(b, dev, AZX_REG_ ## reg, value)
496 #define snd_hdac_stream_readl(dev, reg) \
497         _snd_hdac_stream_read(l, dev, AZX_REG_ ## reg)
498 #define snd_hdac_stream_readw(dev, reg) \
499         _snd_hdac_stream_read(w, dev, AZX_REG_ ## reg)
500 #define snd_hdac_stream_readb(dev, reg) \
501         _snd_hdac_stream_read(b, dev, AZX_REG_ ## reg)
502 
503 /* update a register, pass without AZX_REG_ prefix */
504 #define snd_hdac_stream_updatel(dev, reg, mask, val) \
505         snd_hdac_stream_writel(dev, reg, \
506                                (snd_hdac_stream_readl(dev, reg) & \
507                                 ~(mask)) | (val))
508 #define snd_hdac_stream_updatew(dev, reg, mask, val) \
509         snd_hdac_stream_writew(dev, reg, \
510                                (snd_hdac_stream_readw(dev, reg) & \
511                                 ~(mask)) | (val))
512 #define snd_hdac_stream_updateb(dev, reg, mask, val) \
513         snd_hdac_stream_writeb(dev, reg, \
514                                (snd_hdac_stream_readb(dev, reg) & \
515                                 ~(mask)) | (val))
516 
517 #ifdef CONFIG_SND_HDA_DSP_LOADER
518 /* DSP lock helpers */
519 #define snd_hdac_dsp_lock_init(dev)     mutex_init(&(dev)->dsp_mutex)
520 #define snd_hdac_dsp_lock(dev)          mutex_lock(&(dev)->dsp_mutex)
521 #define snd_hdac_dsp_unlock(dev)        mutex_unlock(&(dev)->dsp_mutex)
522 #define snd_hdac_stream_is_locked(dev)  ((dev)->locked)
523 /* DSP loader helpers */
524 int snd_hdac_dsp_prepare(struct hdac_stream *azx_dev, unsigned int format,
525                          unsigned int byte_size, struct snd_dma_buffer *bufp);
526 void snd_hdac_dsp_trigger(struct hdac_stream *azx_dev, bool start);
527 void snd_hdac_dsp_cleanup(struct hdac_stream *azx_dev,
528                           struct snd_dma_buffer *dmab);
529 #else /* CONFIG_SND_HDA_DSP_LOADER */
530 #define snd_hdac_dsp_lock_init(dev)     do {} while (0)
531 #define snd_hdac_dsp_lock(dev)          do {} while (0)
532 #define snd_hdac_dsp_unlock(dev)        do {} while (0)
533 #define snd_hdac_stream_is_locked(dev)  0
534 
535 static inline int
536 snd_hdac_dsp_prepare(struct hdac_stream *azx_dev, unsigned int format,
537                      unsigned int byte_size, struct snd_dma_buffer *bufp)
538 {
539         return 0;
540 }
541 
542 static inline void snd_hdac_dsp_trigger(struct hdac_stream *azx_dev, bool start)
543 {
544 }
545 
546 static inline void snd_hdac_dsp_cleanup(struct hdac_stream *azx_dev,
547                                         struct snd_dma_buffer *dmab)
548 {
549 }
550 #endif /* CONFIG_SND_HDA_DSP_LOADER */
551 
552 
553 /*
554  * generic array helpers
555  */
556 void *snd_array_new(struct snd_array *array);
557 void snd_array_free(struct snd_array *array);
558 static inline void snd_array_init(struct snd_array *array, unsigned int size,
559                                   unsigned int align)
560 {
561         array->elem_size = size;
562         array->alloc_align = align;
563 }
564 
565 static inline void *snd_array_elem(struct snd_array *array, unsigned int idx)
566 {
567         return array->list + idx * array->elem_size;
568 }
569 
570 static inline unsigned int snd_array_index(struct snd_array *array, void *ptr)
571 {
572         return (unsigned long)(ptr - array->list) / array->elem_size;
573 }
574 
575 /* a helper macro to iterate for each snd_array element */
576 #define snd_array_for_each(array, idx, ptr) \
577         for ((idx) = 0, (ptr) = (array)->list; (idx) < (array)->used; \
578              (ptr) = snd_array_elem(array, ++(idx)))
579 
580 #endif /* __SOUND_HDAUDIO_H */
581 

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