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>
11 #include <linux/pm_runtime.h>
12 #include <linux/timecounter.h>
13 #include <sound/core.h>
14 #include <sound/pcm.h>
15 #include <sound/memalloc.h>
16 #include <sound/hda_verbs.h>
17 #include <drm/i915_component.h>
20 typedef u16 hda_nid_t;
26 struct hdac_widget_tree;
32 extern struct bus_type snd_hda_bus_type;
40 unsigned int elem_size;
41 unsigned int alloc_align;
46 * HD-audio codec base device
52 unsigned int addr; /* codec address */
53 struct list_head list; /* list point for bus codec_list */
55 hda_nid_t afg; /* AFG node id */
56 hda_nid_t mfg; /* MFG node id */
59 unsigned int vendor_id;
60 unsigned int subsystem_id;
61 unsigned int revision_id;
62 unsigned int afg_function_id;
63 unsigned int mfg_function_id;
64 unsigned int afg_unsol:1;
65 unsigned int mfg_unsol:1;
67 unsigned int power_caps; /* FG power caps */
69 const char *vendor_name; /* codec vendor name */
70 const char *chip_name; /* codec chip name */
72 /* verb exec op override */
73 int (*exec_verb)(struct hdac_device *dev, unsigned int cmd,
74 unsigned int flags, unsigned int *res);
77 unsigned int num_nodes;
78 hda_nid_t start_nid, end_nid;
81 atomic_t in_pm; /* suspend/resume being performed */
84 struct mutex widget_lock;
85 struct hdac_widget_tree *widgets;
88 struct regmap *regmap;
89 struct snd_array vendor_verbs;
90 bool lazy_cache:1; /* don't wake up for writes */
91 bool caps_overwriting:1; /* caps overwrite being in process */
92 bool cache_coef:1; /* cache COEF read/write too */
95 /* device/driver type used for matching */
103 SND_SKL_PCI_BIND_AUTO, /* automatic selection based on pci class */
104 SND_SKL_PCI_BIND_LEGACY,/* bind only with legacy driver */
105 SND_SKL_PCI_BIND_ASOC /* bind only with ASoC driver */
110 HDA_INPUT, HDA_OUTPUT
113 #define dev_to_hdac_dev(_dev) container_of(_dev, struct hdac_device, dev)
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 int snd_hdac_device_set_chip_name(struct hdac_device *codec, const char *name);
121 int snd_hdac_codec_modalias(struct hdac_device *hdac, char *buf, size_t size);
123 int snd_hdac_refresh_widgets(struct hdac_device *codec);
125 unsigned int snd_hdac_make_cmd(struct hdac_device *codec, hda_nid_t nid,
126 unsigned int verb, unsigned int parm);
127 int snd_hdac_exec_verb(struct hdac_device *codec, unsigned int cmd,
128 unsigned int flags, unsigned int *res);
129 int snd_hdac_read(struct hdac_device *codec, hda_nid_t nid,
130 unsigned int verb, unsigned int parm, unsigned int *res);
131 int _snd_hdac_read_parm(struct hdac_device *codec, hda_nid_t nid, int parm,
133 int snd_hdac_read_parm_uncached(struct hdac_device *codec, hda_nid_t nid,
135 int snd_hdac_override_parm(struct hdac_device *codec, hda_nid_t nid,
136 unsigned int parm, unsigned int val);
137 int snd_hdac_get_connections(struct hdac_device *codec, hda_nid_t nid,
138 hda_nid_t *conn_list, int max_conns);
139 int snd_hdac_get_sub_nodes(struct hdac_device *codec, hda_nid_t nid,
140 hda_nid_t *start_id);
141 unsigned int snd_hdac_calc_stream_format(unsigned int rate,
142 unsigned int channels,
143 snd_pcm_format_t format,
145 unsigned short spdif_ctls);
146 int snd_hdac_query_supported_pcm(struct hdac_device *codec, hda_nid_t nid,
147 u32 *ratesp, u64 *formatsp, unsigned int *bpsp);
148 bool snd_hdac_is_supported_format(struct hdac_device *codec, hda_nid_t nid,
149 unsigned int format);
151 int snd_hdac_codec_read(struct hdac_device *hdac, hda_nid_t nid,
152 int flags, unsigned int verb, unsigned int parm);
153 int snd_hdac_codec_write(struct hdac_device *hdac, hda_nid_t nid,
154 int flags, unsigned int verb, unsigned int parm);
155 bool snd_hdac_check_power_state(struct hdac_device *hdac,
156 hda_nid_t nid, unsigned int target_state);
157 unsigned int snd_hdac_sync_power_state(struct hdac_device *hdac,
158 hda_nid_t nid, unsigned int target_state);
160 * snd_hdac_read_parm - read a codec parameter
161 * @codec: the codec object
162 * @nid: NID to read a parameter
163 * @parm: parameter to read
165 * Returns -1 for error. If you need to distinguish the error more
166 * strictly, use _snd_hdac_read_parm() directly.
168 static inline int snd_hdac_read_parm(struct hdac_device *codec, hda_nid_t nid,
173 return _snd_hdac_read_parm(codec, nid, parm, &val) < 0 ? -1 : val;
177 int snd_hdac_power_up(struct hdac_device *codec);
178 int snd_hdac_power_down(struct hdac_device *codec);
179 int snd_hdac_power_up_pm(struct hdac_device *codec);
180 int snd_hdac_power_down_pm(struct hdac_device *codec);
181 int snd_hdac_keep_power_up(struct hdac_device *codec);
183 /* call this at entering into suspend/resume callbacks in codec driver */
184 static inline void snd_hdac_enter_pm(struct hdac_device *codec)
186 atomic_inc(&codec->in_pm);
189 /* call this at leaving from suspend/resume callbacks in codec driver */
190 static inline void snd_hdac_leave_pm(struct hdac_device *codec)
192 atomic_dec(&codec->in_pm);
195 static inline bool snd_hdac_is_in_pm(struct hdac_device *codec)
197 return atomic_read(&codec->in_pm);
200 static inline bool snd_hdac_is_power_on(struct hdac_device *codec)
202 return !pm_runtime_suspended(&codec->dev);
205 static inline int snd_hdac_power_up(struct hdac_device *codec) { return 0; }
206 static inline int snd_hdac_power_down(struct hdac_device *codec) { return 0; }
207 static inline int snd_hdac_power_up_pm(struct hdac_device *codec) { return 0; }
208 static inline int snd_hdac_power_down_pm(struct hdac_device *codec) { return 0; }
209 static inline int snd_hdac_keep_power_up(struct hdac_device *codec) { return 0; }
210 static inline void snd_hdac_enter_pm(struct hdac_device *codec) {}
211 static inline void snd_hdac_leave_pm(struct hdac_device *codec) {}
212 static inline bool snd_hdac_is_in_pm(struct hdac_device *codec) { return 0; }
213 static inline bool snd_hdac_is_power_on(struct hdac_device *codec) { return 1; }
217 * HD-audio codec base driver
220 struct device_driver driver;
222 const struct hda_device_id *id_table;
223 int (*match)(struct hdac_device *dev, struct hdac_driver *drv);
224 void (*unsol_event)(struct hdac_device *dev, unsigned int event);
226 /* fields used by ext bus APIs */
227 int (*probe)(struct hdac_device *dev);
228 int (*remove)(struct hdac_device *dev);
229 void (*shutdown)(struct hdac_device *dev);
232 #define drv_to_hdac_driver(_drv) container_of(_drv, struct hdac_driver, driver)
234 const struct hda_device_id *
235 hdac_get_device_id(struct hdac_device *hdev, struct hdac_driver *drv);
240 struct hdac_bus_ops {
241 /* send a single command */
242 int (*command)(struct hdac_bus *bus, unsigned int cmd);
243 /* get a response from the last command */
244 int (*get_response)(struct hdac_bus *bus, unsigned int addr,
249 * ops used for ASoC HDA codec drivers
251 struct hdac_ext_bus_ops {
252 int (*hdev_attach)(struct hdac_device *hdev);
253 int (*hdev_detach)(struct hdac_device *hdev);
256 #define HDA_UNSOL_QUEUE_SIZE 64
257 #define HDA_MAX_CODECS 8 /* limit by controller side */
262 * Each CORB entry is 4byte, RIRB is 8byte
265 __le32 *buf; /* virtual address of CORB/RIRB buffer */
266 dma_addr_t addr; /* physical address of CORB/RIRB buffer */
267 unsigned short rp, wp; /* RIRB read/write pointers */
268 int cmds[HDA_MAX_CODECS]; /* number of pending requests */
269 u32 res[HDA_MAX_CODECS]; /* last read value */
273 * HD-audio bus base driver
275 * @ppcap: pp capabilities pointer
276 * @spbcap: SPIB capabilities pointer
277 * @mlcap: MultiLink capabilities pointer
278 * @gtscap: gts capabilities pointer
279 * @drsmcap: dma resume capabilities pointer
280 * @num_streams: streams supported
281 * @idx: HDA link index
282 * @hlink_list: link list of HDA links
283 * @lock: lock for link and display power mgmt
284 * @cmd_dma_state: state of cmd DMAs: CORB and RIRB
288 const struct hdac_bus_ops *ops;
289 const struct hdac_ext_bus_ops *ext_ops;
293 void __iomem *remap_addr;
297 void __iomem *spbcap;
299 void __iomem *gtscap;
300 void __iomem *drsmcap;
302 /* codec linked list */
303 struct list_head codec_list;
304 unsigned int num_codecs;
306 /* link caddr -> codec */
307 struct hdac_device *caddr_tbl[HDA_MAX_CODEC_ADDRESS + 1];
309 /* unsolicited event queue */
310 u32 unsol_queue[HDA_UNSOL_QUEUE_SIZE * 2]; /* ring buffer */
311 unsigned int unsol_rp, unsol_wp;
312 struct work_struct unsol_work;
314 /* bit flags of detected codecs */
315 unsigned long codec_mask;
317 /* bit flags of powered codecs */
318 unsigned long codec_powered;
323 unsigned int last_cmd[HDA_MAX_CODECS]; /* last sent command */
325 /* CORB/RIRB and position buffers */
326 struct snd_dma_buffer rb;
327 struct snd_dma_buffer posbuf;
328 int dma_type; /* SNDRV_DMA_TYPE_XXX for CORB/RIRB */
330 /* hdac_stream linked list */
331 struct list_head stream_list;
333 /* operation state */
334 bool chip_init:1; /* h/w initialized */
337 bool sync_write:1; /* sync after verb write */
338 bool use_posbuf:1; /* use position buffer */
339 bool snoop:1; /* enable snooping */
340 bool align_bdle_4k:1; /* BDLE align 4K boundary */
341 bool reverse_assign:1; /* assign devices in reverse order */
342 bool corbrp_self_clear:1; /* CORBRP clears itself after reset */
347 int bdl_pos_adj; /* BDL position adjustment */
351 struct mutex cmd_mutex;
354 /* DRM component interface */
355 struct drm_audio_component *audio_component;
356 long display_power_status;
357 unsigned long display_power_active;
359 /* parameters required for enhanced capabilities */
363 /* link management */
364 struct list_head hlink_list;
368 int snd_hdac_bus_init(struct hdac_bus *bus, struct device *dev,
369 const struct hdac_bus_ops *ops);
370 void snd_hdac_bus_exit(struct hdac_bus *bus);
371 int snd_hdac_bus_exec_verb(struct hdac_bus *bus, unsigned int addr,
372 unsigned int cmd, unsigned int *res);
373 int snd_hdac_bus_exec_verb_unlocked(struct hdac_bus *bus, unsigned int addr,
374 unsigned int cmd, unsigned int *res);
375 void snd_hdac_bus_queue_event(struct hdac_bus *bus, u32 res, u32 res_ex);
377 int snd_hdac_bus_add_device(struct hdac_bus *bus, struct hdac_device *codec);
378 void snd_hdac_bus_remove_device(struct hdac_bus *bus,
379 struct hdac_device *codec);
380 void snd_hdac_bus_process_unsol_events(struct work_struct *work);
382 static inline void snd_hdac_codec_link_up(struct hdac_device *codec)
384 set_bit(codec->addr, &codec->bus->codec_powered);
387 static inline void snd_hdac_codec_link_down(struct hdac_device *codec)
389 clear_bit(codec->addr, &codec->bus->codec_powered);
392 int snd_hdac_bus_send_cmd(struct hdac_bus *bus, unsigned int val);
393 int snd_hdac_bus_get_response(struct hdac_bus *bus, unsigned int addr,
395 int snd_hdac_bus_parse_capabilities(struct hdac_bus *bus);
397 bool snd_hdac_bus_init_chip(struct hdac_bus *bus, bool full_reset);
398 void snd_hdac_bus_stop_chip(struct hdac_bus *bus);
399 void snd_hdac_bus_init_cmd_io(struct hdac_bus *bus);
400 void snd_hdac_bus_stop_cmd_io(struct hdac_bus *bus);
401 void snd_hdac_bus_enter_link_reset(struct hdac_bus *bus);
402 void snd_hdac_bus_exit_link_reset(struct hdac_bus *bus);
403 int snd_hdac_bus_reset_link(struct hdac_bus *bus, bool full_reset);
405 void snd_hdac_bus_update_rirb(struct hdac_bus *bus);
406 int snd_hdac_bus_handle_stream_irq(struct hdac_bus *bus, unsigned int status,
407 void (*ack)(struct hdac_bus *,
408 struct hdac_stream *));
410 int snd_hdac_bus_alloc_stream_pages(struct hdac_bus *bus);
411 void snd_hdac_bus_free_stream_pages(struct hdac_bus *bus);
413 #ifdef CONFIG_SND_HDA_ALIGNED_MMIO
414 unsigned int snd_hdac_aligned_read(void __iomem *addr, unsigned int mask);
415 void snd_hdac_aligned_write(unsigned int val, void __iomem *addr,
417 #define snd_hdac_reg_writeb(v, addr) snd_hdac_aligned_write(v, addr, 0xff)
418 #define snd_hdac_reg_writew(v, addr) snd_hdac_aligned_write(v, addr, 0xffff)
419 #define snd_hdac_reg_readb(addr) snd_hdac_aligned_read(addr, 0xff)
420 #define snd_hdac_reg_readw(addr) snd_hdac_aligned_read(addr, 0xffff)
421 #else /* CONFIG_SND_HDA_ALIGNED_MMIO */
422 #define snd_hdac_reg_writeb(val, addr) writeb(val, addr)
423 #define snd_hdac_reg_writew(val, addr) writew(val, addr)
424 #define snd_hdac_reg_readb(addr) readb(addr)
425 #define snd_hdac_reg_readw(addr) readw(addr)
426 #endif /* CONFIG_SND_HDA_ALIGNED_MMIO */
427 #define snd_hdac_reg_writel(val, addr) writel(val, addr)
428 #define snd_hdac_reg_readl(addr) readl(addr)
431 * macros for easy use
433 #define _snd_hdac_chip_writeb(chip, reg, value) \
434 snd_hdac_reg_writeb(value, (chip)->remap_addr + (reg))
435 #define _snd_hdac_chip_readb(chip, reg) \
436 snd_hdac_reg_readb((chip)->remap_addr + (reg))
437 #define _snd_hdac_chip_writew(chip, reg, value) \
438 snd_hdac_reg_writew(value, (chip)->remap_addr + (reg))
439 #define _snd_hdac_chip_readw(chip, reg) \
440 snd_hdac_reg_readw((chip)->remap_addr + (reg))
441 #define _snd_hdac_chip_writel(chip, reg, value) \
442 snd_hdac_reg_writel(value, (chip)->remap_addr + (reg))
443 #define _snd_hdac_chip_readl(chip, reg) \
444 snd_hdac_reg_readl((chip)->remap_addr + (reg))
446 /* read/write a register, pass without AZX_REG_ prefix */
447 #define snd_hdac_chip_writel(chip, reg, value) \
448 _snd_hdac_chip_writel(chip, AZX_REG_ ## reg, value)
449 #define snd_hdac_chip_writew(chip, reg, value) \
450 _snd_hdac_chip_writew(chip, AZX_REG_ ## reg, value)
451 #define snd_hdac_chip_writeb(chip, reg, value) \
452 _snd_hdac_chip_writeb(chip, AZX_REG_ ## reg, value)
453 #define snd_hdac_chip_readl(chip, reg) \
454 _snd_hdac_chip_readl(chip, AZX_REG_ ## reg)
455 #define snd_hdac_chip_readw(chip, reg) \
456 _snd_hdac_chip_readw(chip, AZX_REG_ ## reg)
457 #define snd_hdac_chip_readb(chip, reg) \
458 _snd_hdac_chip_readb(chip, AZX_REG_ ## reg)
460 /* update a register, pass without AZX_REG_ prefix */
461 #define snd_hdac_chip_updatel(chip, reg, mask, val) \
462 snd_hdac_chip_writel(chip, reg, \
463 (snd_hdac_chip_readl(chip, reg) & ~(mask)) | (val))
464 #define snd_hdac_chip_updatew(chip, reg, mask, val) \
465 snd_hdac_chip_writew(chip, reg, \
466 (snd_hdac_chip_readw(chip, reg) & ~(mask)) | (val))
467 #define snd_hdac_chip_updateb(chip, reg, mask, val) \
468 snd_hdac_chip_writeb(chip, reg, \
469 (snd_hdac_chip_readb(chip, reg) & ~(mask)) | (val))
475 struct hdac_bus *bus;
476 struct snd_dma_buffer bdl; /* BDL buffer */
477 __le32 *posbuf; /* position buffer pointer */
478 int direction; /* playback / capture (SNDRV_PCM_STREAM_*) */
480 unsigned int bufsize; /* size of the play buffer in bytes */
481 unsigned int period_bytes; /* size of the period in bytes */
482 unsigned int frags; /* number for period in the play buffer */
483 unsigned int fifo_size; /* FIFO size */
485 void __iomem *sd_addr; /* stream descriptor pointer */
487 u32 sd_int_sta_mask; /* stream int status mask */
490 struct snd_pcm_substream *substream; /* assigned substream,
493 unsigned int format_val; /* format value to be set in the
494 * controller and the codec
496 unsigned char stream_tag; /* assigned stream */
497 unsigned char index; /* stream index */
498 int assigned_key; /* last device# key assigned to */
503 bool no_period_wakeup:1;
507 unsigned long start_wallclk; /* start + minimum wallclk */
508 unsigned long period_wallclk; /* wallclk for period */
509 struct timecounter tc;
510 struct cyclecounter cc;
511 int delay_negative_threshold;
513 struct list_head list;
514 #ifdef CONFIG_SND_HDA_DSP_LOADER
515 /* DSP access mutex */
516 struct mutex dsp_mutex;
520 void snd_hdac_stream_init(struct hdac_bus *bus, struct hdac_stream *azx_dev,
521 int idx, int direction, int tag);
522 struct hdac_stream *snd_hdac_stream_assign(struct hdac_bus *bus,
523 struct snd_pcm_substream *substream);
524 void snd_hdac_stream_release(struct hdac_stream *azx_dev);
525 struct hdac_stream *snd_hdac_get_stream(struct hdac_bus *bus,
526 int dir, int stream_tag);
528 int snd_hdac_stream_setup(struct hdac_stream *azx_dev);
529 void snd_hdac_stream_cleanup(struct hdac_stream *azx_dev);
530 int snd_hdac_stream_setup_periods(struct hdac_stream *azx_dev);
531 int snd_hdac_stream_set_params(struct hdac_stream *azx_dev,
532 unsigned int format_val);
533 void snd_hdac_stream_start(struct hdac_stream *azx_dev, bool fresh_start);
534 void snd_hdac_stream_clear(struct hdac_stream *azx_dev);
535 void snd_hdac_stream_stop(struct hdac_stream *azx_dev);
536 void snd_hdac_stream_reset(struct hdac_stream *azx_dev);
537 void snd_hdac_stream_sync_trigger(struct hdac_stream *azx_dev, bool set,
538 unsigned int streams, unsigned int reg);
539 void snd_hdac_stream_sync(struct hdac_stream *azx_dev, bool start,
540 unsigned int streams);
541 void snd_hdac_stream_timecounter_init(struct hdac_stream *azx_dev,
542 unsigned int streams);
543 int snd_hdac_get_stream_stripe_ctl(struct hdac_bus *bus,
544 struct snd_pcm_substream *substream);
547 * macros for easy use
549 /* read/write a register, pass without AZX_REG_ prefix */
550 #define snd_hdac_stream_writel(dev, reg, value) \
551 snd_hdac_reg_writel(value, (dev)->sd_addr + AZX_REG_ ## reg)
552 #define snd_hdac_stream_writew(dev, reg, value) \
553 snd_hdac_reg_writew(value, (dev)->sd_addr + AZX_REG_ ## reg)
554 #define snd_hdac_stream_writeb(dev, reg, value) \
555 snd_hdac_reg_writeb(value, (dev)->sd_addr + AZX_REG_ ## reg)
556 #define snd_hdac_stream_readl(dev, reg) \
557 snd_hdac_reg_readl((dev)->sd_addr + AZX_REG_ ## reg)
558 #define snd_hdac_stream_readw(dev, reg) \
559 snd_hdac_reg_readw((dev)->sd_addr + AZX_REG_ ## reg)
560 #define snd_hdac_stream_readb(dev, reg) \
561 snd_hdac_reg_readb((dev)->sd_addr + AZX_REG_ ## reg)
563 /* update a register, pass without AZX_REG_ prefix */
564 #define snd_hdac_stream_updatel(dev, reg, mask, val) \
565 snd_hdac_stream_writel(dev, reg, \
566 (snd_hdac_stream_readl(dev, reg) & \
568 #define snd_hdac_stream_updatew(dev, reg, mask, val) \
569 snd_hdac_stream_writew(dev, reg, \
570 (snd_hdac_stream_readw(dev, reg) & \
572 #define snd_hdac_stream_updateb(dev, reg, mask, val) \
573 snd_hdac_stream_writeb(dev, reg, \
574 (snd_hdac_stream_readb(dev, reg) & \
577 #ifdef CONFIG_SND_HDA_DSP_LOADER
578 /* DSP lock helpers */
579 #define snd_hdac_dsp_lock_init(dev) mutex_init(&(dev)->dsp_mutex)
580 #define snd_hdac_dsp_lock(dev) mutex_lock(&(dev)->dsp_mutex)
581 #define snd_hdac_dsp_unlock(dev) mutex_unlock(&(dev)->dsp_mutex)
582 #define snd_hdac_stream_is_locked(dev) ((dev)->locked)
583 /* DSP loader helpers */
584 int snd_hdac_dsp_prepare(struct hdac_stream *azx_dev, unsigned int format,
585 unsigned int byte_size, struct snd_dma_buffer *bufp);
586 void snd_hdac_dsp_trigger(struct hdac_stream *azx_dev, bool start);
587 void snd_hdac_dsp_cleanup(struct hdac_stream *azx_dev,
588 struct snd_dma_buffer *dmab);
589 #else /* CONFIG_SND_HDA_DSP_LOADER */
590 #define snd_hdac_dsp_lock_init(dev) do {} while (0)
591 #define snd_hdac_dsp_lock(dev) do {} while (0)
592 #define snd_hdac_dsp_unlock(dev) do {} while (0)
593 #define snd_hdac_stream_is_locked(dev) 0
596 snd_hdac_dsp_prepare(struct hdac_stream *azx_dev, unsigned int format,
597 unsigned int byte_size, struct snd_dma_buffer *bufp)
602 static inline void snd_hdac_dsp_trigger(struct hdac_stream *azx_dev, bool start)
606 static inline void snd_hdac_dsp_cleanup(struct hdac_stream *azx_dev,
607 struct snd_dma_buffer *dmab)
610 #endif /* CONFIG_SND_HDA_DSP_LOADER */
614 * generic array helpers
616 void *snd_array_new(struct snd_array *array);
617 void snd_array_free(struct snd_array *array);
618 static inline void snd_array_init(struct snd_array *array, unsigned int size,
621 array->elem_size = size;
622 array->alloc_align = align;
625 static inline void *snd_array_elem(struct snd_array *array, unsigned int idx)
627 return array->list + idx * array->elem_size;
630 static inline unsigned int snd_array_index(struct snd_array *array, void *ptr)
632 return (unsigned long)(ptr - array->list) / array->elem_size;
635 /* a helper macro to iterate for each snd_array element */
636 #define snd_array_for_each(array, idx, ptr) \
637 for ((idx) = 0, (ptr) = (array)->list; (idx) < (array)->used; \
638 (ptr) = snd_array_elem(array, ++(idx)))
640 #endif /* __SOUND_HDAUDIO_H */