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/linux/Documentation/sound/soc/
H A Ddai.rst2 ASoC Digital Audio Interface (DAI)
6 SoC controllers and portable audio CODECs today, namely AC97, I2S and PCM.
12 AC97 is a five wire interface commonly found on many PC sound cards. It is
30 usually varies depending on the sample rate and the master system clock
31 (SYSCLK). LRCLK is the same as the sample rate. A few devices support separate
35 I2S has several different operating modes:-
47 PCM chapter
50 PCM is another 4 wire interface, very similar to I2S, which can support a more
53 receive the audio data. Bit clock usually varies depending on sample rate
54 while sync runs at the sample rate. PCM also supports Time Division
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/linux/drivers/usb/gadget/function/
H A Du_uac1_legacy.c1 // SPDX-License-Identifier: GPL-2.0+
3 * u_uac1.c -- ALSA audio utilities for Gadget stack
24 /*-------------------------------------------------------------------------*/
47 changed = -EINVAL; in _snd_pcm_hw_param_set()
53 val--; in _snd_pcm_hw_param_set()
60 changed = -EINVAL; in _snd_pcm_hw_param_set()
71 t.min = val - 1; in _snd_pcm_hw_param_set()
80 return -EINVAL; in _snd_pcm_hw_param_set()
82 params->cmask |= 1 << var; in _snd_pcm_hw_param_set()
83 params->rmask |= 1 << var; in _snd_pcm_hw_param_set()
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/linux/sound/pci/mixart/
H A Dmixart.c1 // SPDX-License-Identifier: GPL-2.0-or-later
14 #include <linux/dma-mapping.h>
23 #include <sound/pcm.h>
36 static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX; /* Index 0-MAX */
67 switch(pipe->status) { in mixart_set_pipe_state()
76 dev_err(&mgr->pc in mixart_set_pipe_state()
158 mixart_set_clock(struct mixart_mgr * mgr,struct mixart_pipe * pipe,unsigned int rate) mixart_set_clock() argument
709 struct snd_pcm *pcm = subs->pcm; snd_mixart_playback_open() local
788 struct snd_pcm *pcm = subs->pcm; snd_mixart_capture_open() local
928 preallocate_buffers(struct snd_mixart * chip,struct snd_pcm * pcm) preallocate_buffers() argument
953 struct snd_pcm *pcm; snd_mixart_pcm_analog() local
987 struct snd_pcm *pcm; snd_mixart_pcm_digital() local
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/linux/drivers/mtd/lpddr/
H A DKconfig1 # SPDX-License-Identifier: GPL-2.0-only
2 menu "LPDDR & LPDDR2 PCM memory drivers"
9 This option enables support of LPDDR (Low power double data rate)
10 flash chips. Synonymous with Mobile-DDR. It is a new standard for
11 DDR memories, intended for battery-operated systems.
18 Window QINFO interface, permits software to be used for entire
25 tristate "Support for LPDDR2-NVM flash chips"
27 This option enables support of PCM memories with a LPDDR2-NVM
28 (Low power double data rate 2) interface.
/linux/sound/usb/
H A Dusbaudio.h1 /* SPDX-License-Identifier: GPL-2.0-or-later */
10 /* handling of USB vendor/product ID pairs as 32-bit numbers */
25 * Structure holding assosiation between Audio Control Interface
26 * and given Streaming or Midi Interface.
29 u8 interface; member
55 struct list_head pcm_list; /* list of pcm streams */
56 struct list_head ep_list; /* list of audio-related endpoints */
57 struct list_head iface_ref_list; /* list of interface refcounts */
72 struct usb_host_interface *ctrl_intf; /* the audio control interface */
80 #define USB_AUDIO_IFACE_UNUSED ((void *)-1L)
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H A Dproc.c1 // SPDX-License-Identifier: GPL-2.0-or-later
10 #include <sound/pcm.h>
18 /* convert our full speed USB rate into sampling rate in Hz */
24 /* convert our high speed USB rate into sampling rate i
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/linux/Documentation/sound/cards/
H A Dcmipci.rst2 Brief Notes on C-Media 8338/8738/8768/8770 Driver
8 Front/Rear Multi-channel Playback
9 ---------------------------------
13 DACs, both streams are handled independently unlike the 4/6ch multi-
16 As default, ALSA driver assigns the first PCM device (i.e. hw:0,0 for
17 card#0) for front and 4/6ch playbacks, while the second PCM device
22 - The first DAC supports U8 and S16LE formats, while the second DAC
24 - The second DAC supports only two channel stereo.
27 rate but only fixed rates: 5512, 8000, 11025, 16000, 22050, 32000,
36 will be FULL VOLUME regardless of Master and PCM volumes [#]_.
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/linux/Documentation/sound/designs/
H A Dcontrol-names.rst8 ---------------
68 Headset Mic mic part of combined headset jack - 4-pin
70 Headphone Mic mic part of either/or - 3-pin headphone or mic
76 PCM
77 PCM Pan
79 Analog Loopback D/A -> A/D loopback
80 Digital Loopback playback -> capture loopback -
98 -----------------------
106 Tone Control - Switch
107 Tone Control - Bass
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H A Dtracepoints.rst8 Tracepoints in ALSA PCM core
11 ALSA PCM core registers ``snd_pcm`` subsystem to kernel tracepoint system.
12 This subsystem includes two categories of tracepoints; for state of PCM buffer
13 and for processing of PCM hardware parameters. These tracepoints are available
18 Tracepoints for state of PCM buffer
19 ------------------------------------
24 Tracepoints for processing of PCM hardware parameters
25 -----------------------------------------------------
30 In a design of ALSA PCM core, data transmission is abstracted as PCM substream.
31 Applications manage PCM substream to maintain data transmission for PCM frames.
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H A Dcompress-offload.rst2 ALSA Compress-Offload API
5 Pierre-Louis.Bossart <pierre-louis.bossart@linux.intel.com>
12 Since its early days, the ALSA API was defined with PCM support or
18 in system-on-chip designs, and DSPs are also integrated in audio
20 reduction of power consumption compared to host-based
26 ALSA PCM interface, a new 'Compressed Data' API is introduced to
27 provide a control and data-streaming interface for audio DSPs.
29 The design of this API was inspired by the 2-year experience with the
39 - separation between byte counts and time. Compressed formats may have
41 may vary from frame-to-frame. As a result, it is not possible to
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/linux/sound/drivers/
H A Ddummy.c1 // SPDX-License-Identifier: GPL-2.0-or-later
21 #include <sound/pcm.h>
46 #define USE_MIXER_VOLUME_LEVEL_MIN -50
49 static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX; /* Index 0-MAX */
51 static bool enable[SNDRV_CARDS] = {1, [1 ... (SNDRV_CARDS - 1)] = 0};
52 static char *model[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS -
129 struct snd_pcm *pcm; global() member
239 unsigned int rate; global() member
438 unsigned int period, rate; dummy_hrtimer_prepare() local
671 struct snd_pcm *pcm; snd_card_dummy_pcm() local
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/linux/include/sound/ac97/
H A Dregs.h1 /* SPDX-License-Identifier: GPL-2.0+
4 * Universal interface for Audio Codec '97
25 #define AC97_PCM 0x18 /* PCM Volume */
33 /* range 0x28-0x3a - AUDIO AC'97 2.0 extensions */
36 #define AC97_PCM_FRONT_DAC_RATE 0x2c /* PCM Front DAC Rate */
37 #define AC97_PCM_SURR_DAC_RATE 0x2e /* PCM Surround DAC Rate */
38 #define AC97_PCM_LFE_DAC_RATE 0x30 /* PCM LFE DAC Rate */
39 #define AC97_PCM_LR_ADC_RATE 0x32 /* PCM LR ADC Rate */
40 #define AC97_PCM_MIC_ADC_RATE 0x34 /* PCM MIC ADC Rate */
44 /* range 0x3c-0x58 - MODEM */
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/linux/sound/sh/
H A Dsh_dac_audio.c1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * sh_dac_audio.c - SuperH DAC audio driver for ALSA
18 #include <sound/pcm.h>
44 int rate; member
55 hrtimer_start(&chip->hrtimer, chip->wakeups_per_second, in dac_audio_start_timer()
61 hrtimer_cancel(&chip->hrtimer); in dac_audio_stop_timer()
67 chip->buffer_begin = chip->buffer_end = chip->data_buffer; in dac_audio_reset()
68 chip->processed = 0; in dac_audio_reset()
69 chip->empty = 1; in dac_audio_reset()
74 chip->wakeups_per_second = 1000000000 / chip->rate; in dac_audio_set_rate()
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/linux/sound/pci/ac97/
H A Dac97_pcm.c1 // SPDX-License-Identifier: GPL-2.0-or-later
4 * Universal interface for Audio Codec '97
18 #include <sound/pcm.h>
26 * PCM support
144 static unsigned char get_slot_reg(struct ac97_pcm *pcm, unsigned short cidx, in get_slot_reg() argument
151 if (pcm in get_slot_reg()
159 set_spdif_rate(struct snd_ac97 * ac97,unsigned short rate) set_spdif_rate() argument
243 snd_ac97_set_rate(struct snd_ac97 * ac97,int reg,unsigned int rate) snd_ac97_set_rate() argument
393 get_rates(struct ac97_pcm * pcm,unsigned int cidx,unsigned short slots,int dbl) get_rates() argument
436 const struct ac97_pcm *pcm; snd_ac97_pcm_assign() local
555 snd_ac97_pcm_open(struct ac97_pcm * pcm,unsigned int rate,enum ac97_pcm_cfg cfg,unsigned short slots) snd_ac97_pcm_open() argument
646 snd_ac97_pcm_close(struct ac97_pcm * pcm) snd_ac97_pcm_close() argument
692 struct snd_interval *rate = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE); double_rate_hw_constraint_rate() local
701 struct snd_interval *rate = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE); double_rate_hw_constraint_channels() local
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H A Dac97_proc.c1 // SPDX-License-Identifier: GPL-2.0-or-later
4 * Universal interface for Audio Codec '97
19 * proc interface
46 snd_iprintf(buffer, "%-17s: %3d.%d dBV %c %2d/fs %s\n", in snd_ac97_proc_read_functions()
48 (info & 0x8000 ? -1 : 1) * ((info & 0x7000) >> 12) * 3 / 2, in snd_ac97_proc_read_functions()
50 info & 0x0400 ? 'X' : '-', in snd_ac97_proc_read_functions()
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/linux/Documentation/devicetree/bindings/net/bluetooth/
H A Dbrcm,bluetooth.yaml1 # SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
3 ---
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
10 - Linus Walleij <linus.walleij@linaro.org>
13 This binding describes Broadcom UART-attached bluetooth chips.
18 - items:
19 - enum:
20 - infineon,cyw43439-bt
21 - const: brcm,bcm4329-bt
22 - enum:
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/linux/sound/soc/tegra/
H A DKconfig1 # SPDX-License-Identifier: GPL-2.0-only
5 tristate "SoC Audio for the Tegra System-on-Chip"
17 tristate "Tegra20 AC97 interface"
22 Tegra20 AC97 interface. You will also need to select the individual
33 tristate "Tegra20 I2S interface"
37 Tegra20 I2S interface. You will also need to select the individual
41 tristate "Tegra20 SPDIF interface"
43 Say Y or M if you want to add support for the Tegra20 SPDIF interface.
55 tristate "Tegra30 I2S interface"
59 Tegra30 I2S interface. You will also need to select the individual
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/linux/include/sound/
H A Dac97_codec.h1 /* SPDX-License-Identifier: GPL-2.0+
4 * Universal interface for Audio Codec '97
17 #include <sound/pcm.h>
24 /* specific - SigmaTel */
33 #define AC97_SIGMATEL_MULTICHN 0x74 /* Multi-Channel programming */
37 /* specific - Analog Devices */
47 /* specific - Cirrus Logic */
56 /* specific - Conexant */
64 /* specific - ALC */
83 #define AC97_ALC650_SPSR_MASK 0x0f00 /* S/PDIF Sample Rate bits */
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/linux/sound/usb/misc/
H A Dua101.c1 // SPDX-License-Identifier: GPL-2.0-only
3 * Edirol UA-101/UA-1000 driver
14 #include <sound/pcm.h>
19 MODULE_DESCRIPTION("Edirol UA-101/1000 driver");
32 * This magic value optimizes memory usage efficiency for the UA-101's packet
55 __stringify(MIN_QUEUE_LENGTH)"-"__stringif
83 struct snd_pcm *pcm; global() member
86 unsigned int rate; global() member
888 find_format_descriptor(struct usb_interface * interface) find_format_descriptor() argument
1125 free_usb_related_resources(struct ua101 * ua,struct usb_interface * interface) free_usb_related_resources() argument
1158 ua101_probe(struct usb_interface * interface,const struct usb_device_id * usb_id) ua101_probe() argument
1303 ua101_disconnect(struct usb_interface * interface) ua101_disconnect() argument
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/linux/sound/firewire/fireworks/
H A Dfireworks_pcm.c1 // SPDX-License-Identifier: GPL-2.0-only
3 * fireworks_pcm.c - a part of driver for Fireworks based devices
5 * Copyright (c) 2009-2010 Clemens Ladisch
6 * Copyright (c) 2013-2014 Takashi Sakamoto
12 * Fireworks changes its AMDTP channels for PCM data according to its sampling
13 * rate. There are three modes. Here _XX is either _rx or _tx.
14 * 0: 32.0- 48.
254 unsigned int rate = params_rate(hw_params); pcm_hw_params() local
392 struct snd_pcm *pcm; snd_efw_create_pcm_devices() local
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/linux/drivers/most/
H A Dmost_snd.c1 // SPDX-License-Identifier: GPL-2.0
3 * sound.c - Sound component for Mostcore
16 #include <sound/pcm.h>
28 * struct channel - private structure to keep channel specific data
30 * @pcm_hardware: low-level hardware description
31 * @iface: interface for which the channel belongs to
42 * @copy_fn: copy function for PCM-specific format and width
93 while (i < bytes - 2) { in swap_copy24()
152 * get_channel - get pointer to channel
153 * @iface: interface structure
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/linux/Documentation/sound/
H A Dalsa-configuration.rst2 Advanced Linux Sound Architecture - Driver Configuration guide
14 and PCM supports if you want to run OSS applications with ALSA.
38 ----------
47 limiting card index for auto-loading (1-8);
49 For auto-loading more than one card, specify this option
50 together with snd-card-X aliases.
63 Module snd-pcm-oss
64 ------------------
66 The PCM OSS emulation module.
70 PCM device number maps assigned to the 1st OSS device;
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/linux/sound/core/
H A Dpcm_misc.c2 * PCM Interface - misc routines
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
25 #include <sound/pcm.h>
29 #define SND_PCM_FORMAT_UNKNOWN (-1)
37 signed char le; /* 0 = big-endian, 1 = little-endian, -1 = others */
38 signed char signd; /* 0 = unsigned, 1 = signed, -1 = others */
52 .width = 8, .phys = 8, .le = -1, .signd = 1,
56 .width = 8, .phys = 8, .le = -1, .signd = 0,
108 .width = 32, .phys = 32, .le = 1, .signd = -1,
112 .width = 32, .phys = 32, .le = 0, .signd = -1,
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/linux/sound/soc/codecs/
H A Dtlv320aic26.c1 // SPDX-License-Identifier: GPL-2.0-only
19 #include <sound/pcm.h>
61 /* ---------------------------------------------------------------------
62 * Digital Audio Interface Operations
68 struct snd_soc_component *component = dai->component; in aic26_hw_params()
73 dev_dbg(&aic26->spi->dev, "aic26_hw_params(substream=%p, params=%p)\n", in aic26_hw_params()
75 dev_dbg(&aic26->spi->dev, "rate=%i width=%d\n", params_rate(params), in aic26_hw_params()
89 dev_dbg(&aic26->spi->dev, "bad rate\n"); return -EINVAL; in aic26_hw_params()
99 dev_dbg(&aic26->spi->dev, "bad format\n"); return -EINVAL; in aic26_hw_params()
109 jval = fsref / (aic26->mclk / 2048); in aic26_hw_params()
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/linux/sound/pci/
H A Dad1889.c1 // SPDX-License-Identifier: GPL-2.0-only
5 * on the HP PA-RISC [BCJ]-xxx0 workstations.
7 * Copyright (C) 2004-2005, Kyle McMartin <kyle@parisc-linux.org>
8 * Copyright (C) 2005, Thibaut Varene <varenet@parisc-linux.org>
15 * Control Interface (mixe
83 struct snd_pcm *pcm; global() member
595 struct snd_pcm *pcm; snd_ad1889_pcm_init() local
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