1 /* SPDX-License-Identifier: GPL-2.0 */
6 #ifndef __SOUND_HDAUDIO_H
7 #define __SOUND_HDAUDIO_H
9 #include <linux/device.h>
10 #include <linux/interrupt.h>
12 #include <linux/pm_runtime.h>
13 #include <linux/timecounter.h>
14 #include <sound/core.h>
15 #include <sound/pcm.h>
16 #include <sound/memalloc.h>
17 #include <sound/hda_verbs.h>
18 #include <drm/i915_component.h>
21 typedef u16 hda_nid_t;
27 struct hdac_widget_tree;
33 extern struct bus_type snd_hda_bus_type;
41 unsigned int elem_size;
42 unsigned int alloc_align;
47 * HD-audio codec base device
53 unsigned int addr; /* codec address */
54 struct list_head list; /* list point for bus codec_list */
56 hda_nid_t afg; /* AFG node id */
57 hda_nid_t mfg; /* MFG node id */
60 unsigned int vendor_id;
61 unsigned int subsystem_id;
62 unsigned int revision_id;
63 unsigned int afg_function_id;
64 unsigned int mfg_function_id;
65 unsigned int afg_unsol:1;
66 unsigned int mfg_unsol:1;
68 unsigned int power_caps; /* FG power caps */
70 const char *vendor_name; /* codec vendor name */
71 const char *chip_name; /* codec chip name */
73 /* verb exec op override */
74 int (*exec_verb)(struct hdac_device *dev, unsigned int cmd,
75 unsigned int flags, unsigned int *res);
78 unsigned int num_nodes;
79 hda_nid_t start_nid, end_nid;
82 atomic_t in_pm; /* suspend/resume being performed */
85 struct mutex widget_lock;
86 struct hdac_widget_tree *widgets;
89 struct regmap *regmap;
90 struct mutex regmap_lock;
91 struct snd_array vendor_verbs;
92 bool lazy_cache:1; /* don't wake up for writes */
93 bool caps_overwriting:1; /* caps overwrite being in process */
94 bool cache_coef:1; /* cache COEF read/write too */
97 /* device/driver type used for matching */
105 SND_SKL_PCI_BIND_AUTO, /* automatic selection based on pci class */
106 SND_SKL_PCI_BIND_LEGACY,/* bind only with legacy driver */
107 SND_SKL_PCI_BIND_ASOC /* bind only with ASoC driver */
112 HDA_INPUT, HDA_OUTPUT
115 #define dev_to_hdac_dev(_dev) container_of(_dev, struct hdac_device, dev)
117 int snd_hdac_device_init(struct hdac_device *dev, struct hdac_bus *bus,
118 const char *name, unsigned int addr);
119 void snd_hdac_device_exit(struct hdac_device *dev);
120 int snd_hdac_device_register(struct hdac_device *codec);
121 void snd_hdac_device_unregister(struct hdac_device *codec);
122 int snd_hdac_device_set_chip_name(struct hdac_device *codec, const char *name);
123 int snd_hdac_codec_modalias(struct hdac_device *hdac, char *buf, size_t size);
125 int snd_hdac_refresh_widgets(struct hdac_device *codec);
127 int snd_hdac_read(struct hdac_device *codec, hda_nid_t nid,
128 unsigned int verb, unsigned int parm, unsigned int *res);
129 int _snd_hdac_read_parm(struct hdac_device *codec, hda_nid_t nid, int parm,
131 int snd_hdac_read_parm_uncached(struct hdac_device *codec, hda_nid_t nid,
133 int snd_hdac_override_parm(struct hdac_device *codec, hda_nid_t nid,
134 unsigned int parm, unsigned int val);
135 int snd_hdac_get_connections(struct hdac_device *codec, hda_nid_t nid,
136 hda_nid_t *conn_list, int max_conns);
137 int snd_hdac_get_sub_nodes(struct hdac_device *codec, hda_nid_t nid,
138 hda_nid_t *start_id);
139 unsigned int snd_hdac_calc_stream_format(unsigned int rate,
140 unsigned int channels,
141 snd_pcm_format_t format,
143 unsigned short spdif_ctls);
144 int snd_hdac_query_supported_pcm(struct hdac_device *codec, hda_nid_t nid,
145 u32 *ratesp, u64 *formatsp, unsigned int *bpsp);
146 bool snd_hdac_is_supported_format(struct hdac_device *codec, hda_nid_t nid,
147 unsigned int format);
149 int snd_hdac_codec_read(struct hdac_device *hdac, hda_nid_t nid,
150 int flags, unsigned int verb, unsigned int parm);
151 int snd_hdac_codec_write(struct hdac_device *hdac, hda_nid_t nid,
152 int flags, unsigned int verb, unsigned int parm);
153 bool snd_hdac_check_power_state(struct hdac_device *hdac,
154 hda_nid_t nid, unsigned int target_state);
155 unsigned int snd_hdac_sync_power_state(struct hdac_device *hdac,
156 hda_nid_t nid, unsigned int target_state);
158 * snd_hdac_read_parm - read a codec parameter
159 * @codec: the codec object
160 * @nid: NID to read a parameter
161 * @parm: parameter to read
163 * Returns -1 for error. If you need to distinguish the error more
164 * strictly, use _snd_hdac_read_parm() directly.
166 static inline int snd_hdac_read_parm(struct hdac_device *codec, hda_nid_t nid,
171 return _snd_hdac_read_parm(codec, nid, parm, &val) < 0 ? -1 : val;
175 int snd_hdac_power_up(struct hdac_device *codec);
176 int snd_hdac_power_down(struct hdac_device *codec);
177 int snd_hdac_power_up_pm(struct hdac_device *codec);
178 int snd_hdac_power_down_pm(struct hdac_device *codec);
179 int snd_hdac_keep_power_up(struct hdac_device *codec);
181 /* call this at entering into suspend/resume callbacks in codec driver */
182 static inline void snd_hdac_enter_pm(struct hdac_device *codec)
184 atomic_inc(&codec->in_pm);
187 /* call this at leaving from suspend/resume callbacks in codec driver */
188 static inline void snd_hdac_leave_pm(struct hdac_device *codec)
190 atomic_dec(&codec->in_pm);
193 static inline bool snd_hdac_is_in_pm(struct hdac_device *codec)
195 return atomic_read(&codec->in_pm);
198 static inline bool snd_hdac_is_power_on(struct hdac_device *codec)
200 return !pm_runtime_suspended(&codec->dev);
203 static inline int snd_hdac_power_up(struct hdac_device *codec) { return 0; }
204 static inline int snd_hdac_power_down(struct hdac_device *codec) { return 0; }
205 static inline int snd_hdac_power_up_pm(struct hdac_device *codec) { return 0; }
206 static inline int snd_hdac_power_down_pm(struct hdac_device *codec) { return 0; }
207 static inline int snd_hdac_keep_power_up(struct hdac_device *codec) { return 0; }
208 static inline void snd_hdac_enter_pm(struct hdac_device *codec) {}
209 static inline void snd_hdac_leave_pm(struct hdac_device *codec) {}
210 static inline bool snd_hdac_is_in_pm(struct hdac_device *codec) { return 0; }
211 static inline bool snd_hdac_is_power_on(struct hdac_device *codec) { return 1; }
215 * HD-audio codec base driver
218 struct device_driver driver;
220 const struct hda_device_id *id_table;
221 int (*match)(struct hdac_device *dev, struct hdac_driver *drv);
222 void (*unsol_event)(struct hdac_device *dev, unsigned int event);
224 /* fields used by ext bus APIs */
225 int (*probe)(struct hdac_device *dev);
226 int (*remove)(struct hdac_device *dev);
227 void (*shutdown)(struct hdac_device *dev);
230 #define drv_to_hdac_driver(_drv) container_of(_drv, struct hdac_driver, driver)
232 const struct hda_device_id *
233 hdac_get_device_id(struct hdac_device *hdev, struct hdac_driver *drv);
238 struct hdac_bus_ops {
239 /* send a single command */
240 int (*command)(struct hdac_bus *bus, unsigned int cmd);
241 /* get a response from the last command */
242 int (*get_response)(struct hdac_bus *bus, unsigned int addr,
247 * ops used for ASoC HDA codec drivers
249 struct hdac_ext_bus_ops {
250 int (*hdev_attach)(struct hdac_device *hdev);
251 int (*hdev_detach)(struct hdac_device *hdev);
254 #define HDA_UNSOL_QUEUE_SIZE 64
255 #define HDA_MAX_CODECS 8 /* limit by controller side */
260 * Each CORB entry is 4byte, RIRB is 8byte
263 __le32 *buf; /* virtual address of CORB/RIRB buffer */
264 dma_addr_t addr; /* physical address of CORB/RIRB buffer */
265 unsigned short rp, wp; /* RIRB read/write pointers */
266 int cmds[HDA_MAX_CODECS]; /* number of pending requests */
267 u32 res[HDA_MAX_CODECS]; /* last read value */
271 * HD-audio bus base driver
273 * @ppcap: pp capabilities pointer
274 * @spbcap: SPIB capabilities pointer
275 * @mlcap: MultiLink capabilities pointer
276 * @gtscap: gts capabilities pointer
277 * @drsmcap: dma resume capabilities pointer
278 * @num_streams: streams supported
279 * @idx: HDA link index
280 * @hlink_list: link list of HDA links
281 * @lock: lock for link and display power mgmt
282 * @cmd_dma_state: state of cmd DMAs: CORB and RIRB
286 const struct hdac_bus_ops *ops;
287 const struct hdac_ext_bus_ops *ext_ops;
291 void __iomem *remap_addr;
295 void __iomem *spbcap;
297 void __iomem *gtscap;
298 void __iomem *drsmcap;
300 /* codec linked list */
301 struct list_head codec_list;
302 unsigned int num_codecs;
304 /* link caddr -> codec */
305 struct hdac_device *caddr_tbl[HDA_MAX_CODEC_ADDRESS + 1];
307 /* unsolicited event queue */
308 u32 unsol_queue[HDA_UNSOL_QUEUE_SIZE * 2]; /* ring buffer */
309 unsigned int unsol_rp, unsol_wp;
310 struct work_struct unsol_work;
312 /* bit flags of detected codecs */
313 unsigned long codec_mask;
315 /* bit flags of powered codecs */
316 unsigned long codec_powered;
321 unsigned int last_cmd[HDA_MAX_CODECS]; /* last sent command */
323 /* CORB/RIRB and position buffers */
324 struct snd_dma_buffer rb;
325 struct snd_dma_buffer posbuf;
326 int dma_type; /* SNDRV_DMA_TYPE_XXX for CORB/RIRB */
328 /* hdac_stream linked list */
329 struct list_head stream_list;
331 /* operation state */
332 bool chip_init:1; /* h/w initialized */
335 bool aligned_mmio:1; /* aligned MMIO access */
336 bool sync_write:1; /* sync after verb write */
337 bool use_posbuf:1; /* use position buffer */
338 bool snoop:1; /* enable snooping */
339 bool align_bdle_4k:1; /* BDLE align 4K boundary */
340 bool reverse_assign:1; /* assign devices in reverse order */
341 bool corbrp_self_clear:1; /* CORBRP clears itself after reset */
346 int bdl_pos_adj; /* BDL position adjustment */
350 struct mutex cmd_mutex;
353 /* DRM component interface */
354 struct drm_audio_component *audio_component;
355 long display_power_status;
356 unsigned long display_power_active;
358 /* parameters required for enhanced capabilities */
362 /* link management */
363 struct list_head hlink_list;
367 int snd_hdac_bus_init(struct hdac_bus *bus, struct device *dev,
368 const struct hdac_bus_ops *ops);
369 void snd_hdac_bus_exit(struct hdac_bus *bus);
370 int snd_hdac_bus_exec_verb(struct hdac_bus *bus, unsigned int addr,
371 unsigned int cmd, unsigned int *res);
372 int snd_hdac_bus_exec_verb_unlocked(struct hdac_bus *bus, unsigned int addr,
373 unsigned int cmd, unsigned int *res);
374 void snd_hdac_bus_queue_event(struct hdac_bus *bus, u32 res, u32 res_ex);
376 static inline void snd_hdac_codec_link_up(struct hdac_device *codec)
378 set_bit(codec->addr, &codec->bus->codec_powered);
381 static inline void snd_hdac_codec_link_down(struct hdac_device *codec)
383 clear_bit(codec->addr, &codec->bus->codec_powered);
386 int snd_hdac_bus_send_cmd(struct hdac_bus *bus, unsigned int val);
387 int snd_hdac_bus_get_response(struct hdac_bus *bus, unsigned int addr,
389 int snd_hdac_bus_parse_capabilities(struct hdac_bus *bus);
391 bool snd_hdac_bus_init_chip(struct hdac_bus *bus, bool full_reset);
392 void snd_hdac_bus_stop_chip(struct hdac_bus *bus);
393 void snd_hdac_bus_init_cmd_io(struct hdac_bus *bus);
394 void snd_hdac_bus_stop_cmd_io(struct hdac_bus *bus);
395 void snd_hdac_bus_enter_link_reset(struct hdac_bus *bus);
396 void snd_hdac_bus_exit_link_reset(struct hdac_bus *bus);
397 int snd_hdac_bus_reset_link(struct hdac_bus *bus, bool full_reset);
399 void snd_hdac_bus_update_rirb(struct hdac_bus *bus);
400 int snd_hdac_bus_handle_stream_irq(struct hdac_bus *bus, unsigned int status,
401 void (*ack)(struct hdac_bus *,
402 struct hdac_stream *));
404 int snd_hdac_bus_alloc_stream_pages(struct hdac_bus *bus);
405 void snd_hdac_bus_free_stream_pages(struct hdac_bus *bus);
407 #ifdef CONFIG_SND_HDA_ALIGNED_MMIO
408 unsigned int snd_hdac_aligned_read(void __iomem *addr, unsigned int mask);
409 void snd_hdac_aligned_write(unsigned int val, void __iomem *addr,
411 #define snd_hdac_aligned_mmio(bus) (bus)->aligned_mmio
413 #define snd_hdac_aligned_mmio(bus) false
414 #define snd_hdac_aligned_read(addr, mask) 0
415 #define snd_hdac_aligned_write(val, addr, mask) do {} while (0)
418 static inline void snd_hdac_reg_writeb(struct hdac_bus *bus, void __iomem *addr,
421 if (snd_hdac_aligned_mmio(bus))
422 snd_hdac_aligned_write(val, addr, 0xff);
427 static inline void snd_hdac_reg_writew(struct hdac_bus *bus, void __iomem *addr,
430 if (snd_hdac_aligned_mmio(bus))
431 snd_hdac_aligned_write(val, addr, 0xffff);
436 static inline u8 snd_hdac_reg_readb(struct hdac_bus *bus, void __iomem *addr)
438 return snd_hdac_aligned_mmio(bus) ?
439 snd_hdac_aligned_read(addr, 0xff) : readb(addr);
442 static inline u16 snd_hdac_reg_readw(struct hdac_bus *bus, void __iomem *addr)
444 return snd_hdac_aligned_mmio(bus) ?
445 snd_hdac_aligned_read(addr, 0xffff) : readw(addr);
448 #define snd_hdac_reg_writel(bus, addr, val) writel(val, addr)
449 #define snd_hdac_reg_readl(bus, addr) readl(addr)
452 * macros for easy use
454 #define _snd_hdac_chip_writeb(chip, reg, value) \
455 snd_hdac_reg_writeb(chip, (chip)->remap_addr + (reg), value)
456 #define _snd_hdac_chip_readb(chip, reg) \
457 snd_hdac_reg_readb(chip, (chip)->remap_addr + (reg))
458 #define _snd_hdac_chip_writew(chip, reg, value) \
459 snd_hdac_reg_writew(chip, (chip)->remap_addr + (reg), value)
460 #define _snd_hdac_chip_readw(chip, reg) \
461 snd_hdac_reg_readw(chip, (chip)->remap_addr + (reg))
462 #define _snd_hdac_chip_writel(chip, reg, value) \
463 snd_hdac_reg_writel(chip, (chip)->remap_addr + (reg), value)
464 #define _snd_hdac_chip_readl(chip, reg) \
465 snd_hdac_reg_readl(chip, (chip)->remap_addr + (reg))
467 /* read/write a register, pass without AZX_REG_ prefix */
468 #define snd_hdac_chip_writel(chip, reg, value) \
469 _snd_hdac_chip_writel(chip, AZX_REG_ ## reg, value)
470 #define snd_hdac_chip_writew(chip, reg, value) \
471 _snd_hdac_chip_writew(chip, AZX_REG_ ## reg, value)
472 #define snd_hdac_chip_writeb(chip, reg, value) \
473 _snd_hdac_chip_writeb(chip, AZX_REG_ ## reg, value)
474 #define snd_hdac_chip_readl(chip, reg) \
475 _snd_hdac_chip_readl(chip, AZX_REG_ ## reg)
476 #define snd_hdac_chip_readw(chip, reg) \
477 _snd_hdac_chip_readw(chip, AZX_REG_ ## reg)
478 #define snd_hdac_chip_readb(chip, reg) \
479 _snd_hdac_chip_readb(chip, AZX_REG_ ## reg)
481 /* update a register, pass without AZX_REG_ prefix */
482 #define snd_hdac_chip_updatel(chip, reg, mask, val) \
483 snd_hdac_chip_writel(chip, reg, \
484 (snd_hdac_chip_readl(chip, reg) & ~(mask)) | (val))
485 #define snd_hdac_chip_updatew(chip, reg, mask, val) \
486 snd_hdac_chip_writew(chip, reg, \
487 (snd_hdac_chip_readw(chip, reg) & ~(mask)) | (val))
488 #define snd_hdac_chip_updateb(chip, reg, mask, val) \
489 snd_hdac_chip_writeb(chip, reg, \
490 (snd_hdac_chip_readb(chip, reg) & ~(mask)) | (val))
496 struct hdac_bus *bus;
497 struct snd_dma_buffer bdl; /* BDL buffer */
498 __le32 *posbuf; /* position buffer pointer */
499 int direction; /* playback / capture (SNDRV_PCM_STREAM_*) */
501 unsigned int bufsize; /* size of the play buffer in bytes */
502 unsigned int period_bytes; /* size of the period in bytes */
503 unsigned int frags; /* number for period in the play buffer */
504 unsigned int fifo_size; /* FIFO size */
506 void __iomem *sd_addr; /* stream descriptor pointer */
508 u32 sd_int_sta_mask; /* stream int status mask */
511 struct snd_pcm_substream *substream; /* assigned substream,
514 unsigned int format_val; /* format value to be set in the
515 * controller and the codec
517 unsigned char stream_tag; /* assigned stream */
518 unsigned char index; /* stream index */
519 int assigned_key; /* last device# key assigned to */
524 bool no_period_wakeup:1;
526 bool stripe:1; /* apply stripe control */
529 unsigned long start_wallclk; /* start + minimum wallclk */
530 unsigned long period_wallclk; /* wallclk for period */
531 struct timecounter tc;
532 struct cyclecounter cc;
533 int delay_negative_threshold;
535 struct list_head list;
536 #ifdef CONFIG_SND_HDA_DSP_LOADER
537 /* DSP access mutex */
538 struct mutex dsp_mutex;
542 void snd_hdac_stream_init(struct hdac_bus *bus, struct hdac_stream *azx_dev,
543 int idx, int direction, int tag);
544 struct hdac_stream *snd_hdac_stream_assign(struct hdac_bus *bus,
545 struct snd_pcm_substream *substream);
546 void snd_hdac_stream_release(struct hdac_stream *azx_dev);
547 struct hdac_stream *snd_hdac_get_stream(struct hdac_bus *bus,
548 int dir, int stream_tag);
550 int snd_hdac_stream_setup(struct hdac_stream *azx_dev);
551 void snd_hdac_stream_cleanup(struct hdac_stream *azx_dev);
552 int snd_hdac_stream_setup_periods(struct hdac_stream *azx_dev);
553 int snd_hdac_stream_set_params(struct hdac_stream *azx_dev,
554 unsigned int format_val);
555 void snd_hdac_stream_start(struct hdac_stream *azx_dev, bool fresh_start);
556 void snd_hdac_stream_clear(struct hdac_stream *azx_dev);
557 void snd_hdac_stream_stop(struct hdac_stream *azx_dev);
558 void snd_hdac_stop_streams(struct hdac_bus *bus);
559 void snd_hdac_stop_streams_and_chip(struct hdac_bus *bus);
560 void snd_hdac_stream_reset(struct hdac_stream *azx_dev);
561 void snd_hdac_stream_sync_trigger(struct hdac_stream *azx_dev, bool set,
562 unsigned int streams, unsigned int reg);
563 void snd_hdac_stream_sync(struct hdac_stream *azx_dev, bool start,
564 unsigned int streams);
565 void snd_hdac_stream_timecounter_init(struct hdac_stream *azx_dev,
566 unsigned int streams);
567 int snd_hdac_get_stream_stripe_ctl(struct hdac_bus *bus,
568 struct snd_pcm_substream *substream);
571 * macros for easy use
573 /* read/write a register, pass without AZX_REG_ prefix */
574 #define snd_hdac_stream_writel(dev, reg, value) \
575 snd_hdac_reg_writel((dev)->bus, (dev)->sd_addr + AZX_REG_ ## reg, value)
576 #define snd_hdac_stream_writew(dev, reg, value) \
577 snd_hdac_reg_writew((dev)->bus, (dev)->sd_addr + AZX_REG_ ## reg, value)
578 #define snd_hdac_stream_writeb(dev, reg, value) \
579 snd_hdac_reg_writeb((dev)->bus, (dev)->sd_addr + AZX_REG_ ## reg, value)
580 #define snd_hdac_stream_readl(dev, reg) \
581 snd_hdac_reg_readl((dev)->bus, (dev)->sd_addr + AZX_REG_ ## reg)
582 #define snd_hdac_stream_readw(dev, reg) \
583 snd_hdac_reg_readw((dev)->bus, (dev)->sd_addr + AZX_REG_ ## reg)
584 #define snd_hdac_stream_readb(dev, reg) \
585 snd_hdac_reg_readb((dev)->bus, (dev)->sd_addr + AZX_REG_ ## reg)
587 /* update a register, pass without AZX_REG_ prefix */
588 #define snd_hdac_stream_updatel(dev, reg, mask, val) \
589 snd_hdac_stream_writel(dev, reg, \
590 (snd_hdac_stream_readl(dev, reg) & \
592 #define snd_hdac_stream_updatew(dev, reg, mask, val) \
593 snd_hdac_stream_writew(dev, reg, \
594 (snd_hdac_stream_readw(dev, reg) & \
596 #define snd_hdac_stream_updateb(dev, reg, mask, val) \
597 snd_hdac_stream_writeb(dev, reg, \
598 (snd_hdac_stream_readb(dev, reg) & \
601 #ifdef CONFIG_SND_HDA_DSP_LOADER
602 /* DSP lock helpers */
603 #define snd_hdac_dsp_lock_init(dev) mutex_init(&(dev)->dsp_mutex)
604 #define snd_hdac_dsp_lock(dev) mutex_lock(&(dev)->dsp_mutex)
605 #define snd_hdac_dsp_unlock(dev) mutex_unlock(&(dev)->dsp_mutex)
606 #define snd_hdac_stream_is_locked(dev) ((dev)->locked)
607 /* DSP loader helpers */
608 int snd_hdac_dsp_prepare(struct hdac_stream *azx_dev, unsigned int format,
609 unsigned int byte_size, struct snd_dma_buffer *bufp);
610 void snd_hdac_dsp_trigger(struct hdac_stream *azx_dev, bool start);
611 void snd_hdac_dsp_cleanup(struct hdac_stream *azx_dev,
612 struct snd_dma_buffer *dmab);
613 #else /* CONFIG_SND_HDA_DSP_LOADER */
614 #define snd_hdac_dsp_lock_init(dev) do {} while (0)
615 #define snd_hdac_dsp_lock(dev) do {} while (0)
616 #define snd_hdac_dsp_unlock(dev) do {} while (0)
617 #define snd_hdac_stream_is_locked(dev) 0
620 snd_hdac_dsp_prepare(struct hdac_stream *azx_dev, unsigned int format,
621 unsigned int byte_size, struct snd_dma_buffer *bufp)
626 static inline void snd_hdac_dsp_trigger(struct hdac_stream *azx_dev, bool start)
630 static inline void snd_hdac_dsp_cleanup(struct hdac_stream *azx_dev,
631 struct snd_dma_buffer *dmab)
634 #endif /* CONFIG_SND_HDA_DSP_LOADER */
638 * generic array helpers
640 void *snd_array_new(struct snd_array *array);
641 void snd_array_free(struct snd_array *array);
642 static inline void snd_array_init(struct snd_array *array, unsigned int size,
645 array->elem_size = size;
646 array->alloc_align = align;
649 static inline void *snd_array_elem(struct snd_array *array, unsigned int idx)
651 return array->list + idx * array->elem_size;
654 static inline unsigned int snd_array_index(struct snd_array *array, void *ptr)
656 return (unsigned long)(ptr - array->list) / array->elem_size;
659 /* a helper macro to iterate for each snd_array element */
660 #define snd_array_for_each(array, idx, ptr) \
661 for ((idx) = 0, (ptr) = (array)->list; (idx) < (array)->used; \
662 (ptr) = snd_array_elem(array, ++(idx)))
664 #endif /* __SOUND_HDAUDIO_H */