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-rw-r--r--Documentation/sound/alsa/ALSA-Configuration.txt115
-rw-r--r--Documentation/sound/alsa/CMIPCI.txt17
-rw-r--r--Documentation/sound/alsa/DocBook/writing-an-alsa-driver.tmpl184
-rw-r--r--Documentation/sound/alsa/OSS-Emulation.txt7
-rw-r--r--Documentation/sound/alsa/hda_codec.txt49
-rw-r--r--Documentation/sound/alsa/powersave.txt41
6 files changed, 330 insertions, 83 deletions
diff --git a/Documentation/sound/alsa/ALSA-Configuration.txt b/Documentation/sound/alsa/ALSA-Configuration.txt
index 241e26c4ff9..4b48c2e82c3 100644
--- a/Documentation/sound/alsa/ALSA-Configuration.txt
+++ b/Documentation/sound/alsa/ALSA-Configuration.txt
@@ -365,13 +365,14 @@ Prior to version 0.9.0rc4 options had a 'snd_' prefix. This was removed.
Module snd-cmipci
-----------------
- Module for C-Media CMI8338 and 8738 PCI sound cards.
+ Module for C-Media CMI8338/8738/8768/8770 PCI sound cards.
- mpu_port - 0x300,0x310,0x320,0x330 = legacy port,
- 1 = integrated PCI port,
+ mpu_port - port address of MIDI interface (8338 only):
+ 0x300,0x310,0x320,0x330 = legacy port,
0 = disable (default)
- fm_port - 0x388 = legacy port,
- 1 = integrated PCI port (default),
+ fm_port - port address of OPL-3 FM synthesizer (8x38 only):
+ 0x388 = legacy port,
+ 1 = integrated PCI port (default on 8738),
0 = disable
soft_ac3 - Software-conversion of raw SPDIF packets (model 033 only)
(default = 1)
@@ -768,6 +769,10 @@ Prior to version 0.9.0rc4 options had a 'snd_' prefix. This was removed.
single_cmd - Use single immediate commands to communicate with
codecs (for debugging only)
enable_msi - Enable Message Signaled Interrupt (MSI) (default = off)
+ power_save - Automatic power-saving timtout (in second, 0 =
+ disable)
+ power_save_controller - Reset HD-audio controller in power-saving mode
+ (default = on)
This module supports one card and autoprobe.
@@ -828,6 +833,8 @@ Prior to version 0.9.0rc4 options had a 'snd_' prefix. This was removed.
ALC268
3stack 3-stack model
+ toshiba Toshiba A205
+ acer Acer laptops
auto auto-config reading BIOS (default)
ALC662
@@ -842,7 +849,11 @@ Prior to version 0.9.0rc4 options had a 'snd_' prefix. This was removed.
3stack-dig 3-jack with SPDIF I/O
6stack-dig 6-jack digital with SPDIF I/O
arima Arima W820Di1
+ targa Targa T8, MSI-1049 T8
+ asus-a7j ASUS A7J
+ asus-a7m ASUS A7M
macpro MacPro support
+ mbp3 Macbook Pro rev3
imac24 iMac 24'' with jack detection
w2jc ASUS W2JC
auto auto-config reading BIOS (default)
@@ -854,6 +865,7 @@ Prior to version 0.9.0rc4 options had a 'snd_' prefix. This was removed.
3stack-6ch-dig 3-jack 6-channel with SPDIF I/O
6stack-dig-demo 6-jack digital for Intel demo board
acer Acer laptops (Travelmate 3012WTMi, Aspire 5600, etc)
+ acer-aspire Acer Aspire 9810
medion Medion Laptops
medion-md2 Medion MD2
targa-dig Targa/MSI
@@ -862,6 +874,7 @@ Prior to version 0.9.0rc4 options had a 'snd_' prefix. This was removed.
lenovo-101e Lenovo 101E
lenovo-nb0763 Lenovo NB0763
lenovo-ms7195-dig Lenovo MS7195
+ haier-w66 Haier W66
6stack-hp HP machines with 6stack (Nettle boards)
3stack-hp HP machines with 3stack (Lucknow, Samba boards)
auto auto-config reading BIOS (default)
@@ -885,6 +898,7 @@ Prior to version 0.9.0rc4 options had a 'snd_' prefix. This was removed.
3stack-660-digout 3-jack with SPDIF OUT (for ALC660VD)
lenovo Lenovo 3000 C200
dallas Dallas laptops
+ hp HP TX1000
auto auto-config reading BIOS (default)
CMI9880
@@ -920,6 +934,7 @@ Prior to version 0.9.0rc4 options had a 'snd_' prefix. This was removed.
3stack 3-stack, shared surrounds
laptop 2-channel only (FSC V2060, Samsung M50)
laptop-eapd 2-channel with EAPD (Samsung R65, ASUS A6J)
+ laptop-automute 2-channel with EAPD and HP-automute (Lenovo N100)
ultra 2-channel with EAPD (Samsung Ultra tablet PC)
AD1988
@@ -945,14 +960,30 @@ Prior to version 0.9.0rc4 options had a 'snd_' prefix. This was removed.
can be adjusted. Appearing only when compiled with
$CONFIG_SND_DEBUG=y
- STAC9200/9205/9254
+ STAC9200
ref Reference board
+ dell-d21 Dell (unknown)
+ dell-d22 Dell (unknown)
+ dell-d23 Dell (unknown)
+ dell-m21 Dell Inspiron 630m, Dell Inspiron 640m
+ dell-m22 Dell Latitude D620, Dell Latitude D820
+ dell-m23 Dell XPS M1710, Dell Precision M90
+ dell-m24 Dell Latitude 120L
+ dell-m25 Dell Inspiron E1505n
+ dell-m26 Dell Inspiron 1501
+ dell-m27 Dell Inspiron E1705/9400
+ gateway Gateway laptops with EAPD control
+
+ STAC9205/9254
+ ref Reference board
+ dell-m42 Dell (unknown)
+ dell-m43 Dell Precision
+ dell-m44 Dell Inspiron
STAC9220/9221
ref Reference board
3stack D945 3stack
5stack D945 5stack + SPDIF
- dell Dell XPS M1210
intel-mac-v1 Intel Mac Type 1
intel-mac-v2 Intel Mac Type 2
intel-mac-v3 Intel Mac Type 3
@@ -964,6 +995,10 @@ Prior to version 0.9.0rc4 options had a 'snd_' prefix. This was removed.
macbook-pro Intel Mac Book Pro 2nd generation (eq. type 3)
imac-intel Intel iMac (eq. type 2)
imac-intel-20 Intel iMac (newer version) (eq. type 3)
+ dell-d81 Dell (unknown)
+ dell-d82 Dell (unknown)
+ dell-m81 Dell (unknown)
+ dell-m82 Dell XPS M1210
STAC9202/9250/9251
ref Reference board, base config
@@ -975,6 +1010,7 @@ Prior to version 0.9.0rc4 options had a 'snd_' prefix. This was removed.
ref Reference board
3stack D965 3stack
5stack D965 5stack + SPDIF
+ dell-3stack Dell Dimension E520
STAC9872
vaio Setup for VAIO FE550G/SZ110
@@ -989,6 +1025,9 @@ Prior to version 0.9.0rc4 options had a 'snd_' prefix. This was removed.
subsystem ID (output of "lspci -nv") to ALSA BTS or alsa-devel
ML (see the section "Links and Addresses").
+ power_save and power_save_controller options are for power-saving
+ mode. See powersave.txt for details.
+
Note 2: If you get click noises on output, try the module option
position_fix=1 or 2. position_fix=1 will use the SD_LPIB
register value without FIFO size correction as the current
@@ -1349,7 +1388,6 @@ Prior to version 0.9.0rc4 options had a 'snd_' prefix. This was removed.
port - port number or -1 (disable)
irq - IRQ number or -1 (disable)
pnp - PnP detection - 0 = disable, 1 = enable (default)
- uart_enter - Issue UART_ENTER command at open - bool, default = on
This module supports multiple devices and PnP.
@@ -1630,6 +1668,21 @@ Prior to version 0.9.0rc4 options had a 'snd_' prefix. This was removed.
The power-management is supported.
+ Module snd-sc6000
+ -----------------
+
+ Module for Gallant SC-6000 soundcard.
+
+ port - Port # (0x220 or 0x240)
+ mss_port - MSS Port # (0x530 or 0xe80)
+ irq - IRQ # (5,7,9,10,11)
+ mpu_irq - MPU-401 IRQ # (5,7,9,10) ,0 - no MPU-401 irq
+ dma - DMA # (1,3,0)
+
+ This module supports multiple cards.
+
+ This card is also known as Audio Excel DSP 16 or Zoltrix AV302.
+
Module snd-sgalaxy
------------------
@@ -1650,9 +1703,11 @@ Prior to version 0.9.0rc4 options had a 'snd_' prefix. This was removed.
Module for ENSONIQ SoundScape PnP cards.
port - Port # (PnP setup)
+ wss_port - WSS Port # (PnP setup)
irq - IRQ # (PnP setup)
mpu_irq - MPU-401 IRQ # (PnP setup)
dma - DMA # (PnP setup)
+ dma2 - 2nd DMA # (PnP setup, -1 to disable)
This module supports multiple cards. ISA PnP must be enabled.
You need sscape_ctl tool in alsa-tools package for loading
@@ -1697,8 +1752,52 @@ Prior to version 0.9.0rc4 options had a 'snd_' prefix. This was removed.
dma2 - DMA2 # for CS4232 PCM interface.
isapnp - ISA PnP detection - 0 = disable, 1 = enable (default)
+ The below are options for wavefront_synth features:
+ wf_raw - Assume that we need to boot the OS (default:no)
+ If yes, then during driver loading, the state of the board is
+ ignored, and we reset the board and load the firmware anyway.
+ fx_raw - Assume that the FX process needs help (default:yes)
+ If false, we'll leave the FX processor in whatever state it is
+ when the driver is loaded. The default is to download the
+ microprogram and associated coefficients to set it up for
+ "default" operation, whatever that means.
+ debug_default - Debug parameters for card initialization
+ wait_usecs - How long to wait without sleeping, usecs
+ (default:150)
+ This magic number seems to give pretty optimal throughput
+ based on my limited experimentation.
+ If you want to play around with it and find a better value, be
+ my guest. Remember, the idea is to get a number that causes us
+ to just busy wait for as many WaveFront commands as possible,
+ without coming up with a number so large that we hog the whole
+ CPU.
+ Specifically, with this number, out of about 134,000 status
+ waits, only about 250 result in a sleep.
+ sleep_interval - How long to sleep when waiting for reply
+ (default: 100)
+ sleep_tries - How many times to try sleeping during a wait
+ (default: 50)
+ ospath - Pathname to processed ICS2115 OS firmware
+ (default:wavefront.os)
+ The path name of the ISC2115 OS firmware. In the recent
+ version, it's handled via firmware loader framework, so it
+ must be installed in the proper path, typically,
+ /lib/firmware.
+ reset_time - How long to wait for a reset to take effect
+ (default:2)
+ ramcheck_time - How many seconds to wait for the RAM test
+ (default:20)
+ osrun_time - How many seconds to wait for the ICS2115 OS
+ (default:10)
+
This module supports multiple cards and ISA PnP.
+ Note: the firmware file "wavefront.os" was located in the earlier
+ version in /etc. Now it's loaded via firmware loader, and
+ must be in the proper firmware path, such as /lib/firmware.
+ Copy (or symlink) the file appropriately if you get an error
+ regarding firmware downloading after upgrading the kernel.
+
Module snd-sonicvibes
---------------------
diff --git a/Documentation/sound/alsa/CMIPCI.txt b/Documentation/sound/alsa/CMIPCI.txt
index 4b2b1538705..16935c8561f 100644
--- a/Documentation/sound/alsa/CMIPCI.txt
+++ b/Documentation/sound/alsa/CMIPCI.txt
@@ -1,5 +1,5 @@
- Brief Notes on C-Media 8738/8338 Driver
- =======================================
+ Brief Notes on C-Media 8338/8738/8768/8770 Driver
+ =================================================
Takashi Iwai <tiwai@suse.de>
@@ -209,10 +209,13 @@ In addition to the standard SB mixer, CM8x38 provides more functions.
MIDI CONTROLLER
---------------
-The MPU401-UART interface is disabled as default. You need to set
-module option "mpu_port" with a valid I/O port address to enable the
-MIDI support. The valid I/O ports are 0x300, 0x310, 0x320 and 0x330.
-Choose the value which doesn't conflict with other cards.
+With CMI8338 chips, the MPU401-UART interface is disabled as default.
+You need to set the module option "mpu_port" to a valid I/O port address
+to enable MIDI support. Valid I/O ports are 0x300, 0x310, 0x320 and
+0x330. Choose a value that doesn't conflict with other cards.
+
+With CMI8738 and newer chips, the MIDI interface is enabled by default
+and the driver automatically chooses a port address.
There is _no_ hardware wavetable function on this chip (except for
OPL3 synth below).
@@ -230,6 +233,8 @@ Set "fm_port" module option for more cards.
The output quality of FM OPL/3 is, however, very weird.
I don't know why..
+CMI8768 and newer chips do not have the FM synth.
+
Joystick and Modem
------------------
diff --git a/Documentation/sound/alsa/DocBook/writing-an-alsa-driver.tmpl b/Documentation/sound/alsa/DocBook/writing-an-alsa-driver.tmpl
index 74d3a35b59b..2c3fc3cb3b6 100644
--- a/Documentation/sound/alsa/DocBook/writing-an-alsa-driver.tmpl
+++ b/Documentation/sound/alsa/DocBook/writing-an-alsa-driver.tmpl
@@ -18,8 +18,8 @@
</affiliation>
</author>
- <date>November 17, 2005</date>
- <edition>0.3.6</edition>
+ <date>September 10, 2007</date>
+ <edition>0.3.7</edition>
<abstract>
<para>
@@ -405,8 +405,9 @@
/* definition of the chip-specific record */
struct mychip {
struct snd_card *card;
- // rest of implementation will be in the section
- // "PCI Resource Managements"
+ /* rest of implementation will be in the section
+ * "PCI Resource Managements"
+ */
};
/* chip-specific destructor
@@ -414,7 +415,7 @@
*/
static int snd_mychip_free(struct mychip *chip)
{
- .... // will be implemented later...
+ .... /* will be implemented later... */
}
/* component-destructor
@@ -440,8 +441,9 @@
*rchip = NULL;
- // check PCI availability here
- // (see "PCI Resource Managements")
+ /* check PCI availability here
+ * (see "PCI Resource Managements")
+ */
....
/* allocate a chip-specific data with zero filled */
@@ -451,12 +453,13 @@
chip->card = card;
- // rest of initialization here; will be implemented
- // later, see "PCI Resource Managements"
+ /* rest of initialization here; will be implemented
+ * later, see "PCI Resource Managements"
+ */
....
- if ((err = snd_device_new(card, SNDRV_DEV_LOWLEVEL,
- chip, &ops)) < 0) {
+ err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, chip, &ops);
+ if (err < 0) {
snd_mychip_free(chip);
return err;
}
@@ -490,7 +493,8 @@
return -ENOMEM;
/* (3) */
- if ((err = snd_mychip_create(card, pci, &chip)) < 0) {
+ err = snd_mychip_create(card, pci, &chip);
+ if (err < 0) {
snd_card_free(card);
return err;
}
@@ -502,10 +506,11 @@
card->shortname, chip->ioport, chip->irq);
/* (5) */
- .... // implemented later
+ .... /* implemented later */
/* (6) */
- if ((err = snd_card_register(card)) < 0) {
+ err = snd_card_register(card);
+ if (err < 0) {
snd_card_free(card);
return err;
}
@@ -605,7 +610,8 @@
<![CDATA[
struct mychip *chip;
....
- if ((err = snd_mychip_create(card, pci, &chip)) < 0) {
+ err = snd_mychip_create(card, pci, &chip);
+ if (err < 0) {
snd_card_free(card);
return err;
}
@@ -666,7 +672,8 @@
<informalexample>
<programlisting>
<![CDATA[
- if ((err = snd_card_register(card)) < 0) {
+ err = snd_card_register(card);
+ if (err < 0) {
snd_card_free(card);
return err;
}
@@ -1091,7 +1098,7 @@
static int snd_mychip_free(struct mychip *chip)
{
/* disable hardware here if any */
- .... // (not implemented in this document)
+ .... /* (not implemented in this document) */
/* release the irq */
if (chip->irq >= 0)
@@ -1119,7 +1126,8 @@
*rchip = NULL;
/* initialize the PCI entry */
- if ((err = pci_enable_device(pci)) < 0)
+ err = pci_enable_device(pci);
+ if (err < 0)
return err;
/* check PCI availability (28bit DMA) */
if (pci_set_dma_mask(pci, DMA_28BIT_MASK) < 0 ||
@@ -1141,7 +1149,8 @@
chip->irq = -1;
/* (1) PCI resource allocation */
- if ((err = pci_request_regions(pci, "My Chip")) < 0) {
+ err = pci_request_regions(pci, "My Chip");
+ if (err < 0) {
kfree(chip);
pci_disable_device(pci);
return err;
@@ -1156,10 +1165,10 @@
chip->irq = pci->irq;
/* (2) initialization of the chip hardware */
- .... // (not implemented in this document)
+ .... /* (not implemented in this document) */
- if ((err = snd_device_new(card, SNDRV_DEV_LOWLEVEL,
- chip, &ops)) < 0) {
+ err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, chip, &ops);
+ if (err < 0) {
snd_mychip_free(chip);
return err;
}
@@ -1233,7 +1242,8 @@
<informalexample>
<programlisting>
<![CDATA[
- if ((err = pci_enable_device(pci)) < 0)
+ err = pci_enable_device(pci);
+ if (err < 0)
return err;
if (pci_set_dma_mask(pci, DMA_28BIT_MASK) < 0 ||
pci_set_consistent_dma_mask(pci, DMA_28BIT_MASK) < 0) {
@@ -1294,7 +1304,8 @@
<informalexample>
<programlisting>
<![CDATA[
- if ((err = pci_request_regions(pci, "My Chip")) < 0) {
+ err = pci_request_regions(pci, "My Chip");
+ if (err < 0) {
kfree(chip);
pci_disable_device(pci);
return err;
@@ -1322,7 +1333,7 @@
<programlisting>
<![CDATA[
if (request_irq(pci->irq, snd_mychip_interrupt,
- IRQF_DISABLED|IRQF_SHARED, "My Chip", chip)) {
+ IRQF_SHARED, "My Chip", chip)) {
printk(KERN_ERR "cannot grab irq %d\n", pci->irq);
snd_mychip_free(chip);
return -EBUSY;
@@ -1773,7 +1784,8 @@
struct snd_pcm_runtime *runtime = substream->runtime;
runtime->hw = snd_mychip_playback_hw;
- // more hardware-initialization will be done here
+ /* more hardware-initialization will be done here */
+ ....
return 0;
}
@@ -1781,7 +1793,8 @@
static int snd_mychip_playback_close(struct snd_pcm_substream *substream)
{
struct mychip *chip = snd_pcm_substream_chip(substream);
- // the hardware-specific codes will be here
+ /* the hardware-specific codes will be here */
+ ....
return 0;
}
@@ -1793,7 +1806,8 @@
struct snd_pcm_runtime *runtime = substream->runtime;
runtime->hw = snd_mychip_capture_hw;
- // more hardware-initialization will be done here
+ /* more hardware-initialization will be done here */
+ ....
return 0;
}
@@ -1801,7 +1815,8 @@
static int snd_mychip_capture_close(struct snd_pcm_substream *substream)
{
struct mychip *chip = snd_pcm_substream_chip(substream);
- // the hardware-specific codes will be here
+ /* the hardware-specific codes will be here */
+ ....
return 0;
}
@@ -1844,10 +1859,12 @@
{
switch (cmd) {
case SNDRV_PCM_TRIGGER_START:
- // do something to start the PCM engine
+ /* do something to start the PCM engine */
+ ....
break;
case SNDRV_PCM_TRIGGER_STOP:
- // do something to stop the PCM engine
+ /* do something to stop the PCM engine */
+ ....
break;
default:
return -EINVAL;
@@ -1900,8 +1917,8 @@
struct snd_pcm *pcm;
int err;
- if ((err = snd_pcm_new(chip->card, "My Chip", 0, 1, 1,
- &pcm)) < 0)
+ err = snd_pcm_new(chip->card, "My Chip", 0, 1, 1, &pcm);
+ if (err < 0)
return err;
pcm->private_data = chip;
strcpy(pcm->name, "My Chip");
@@ -1939,8 +1956,8 @@
struct snd_pcm *pcm;
int err;
- if ((err = snd_pcm_new(chip->card, "My Chip", 0, 1, 1,
- &pcm)) < 0)
+ err = snd_pcm_new(chip->card, "My Chip", 0, 1, 1, &pcm);
+ if (err < 0)
return err;
pcm->private_data = chip;
strcpy(pcm->name, "My Chip");
@@ -2097,7 +2114,7 @@
struct mychip *chip = snd_pcm_chip(pcm);
/* free your own data */
kfree(chip->my_private_pcm_data);
- // do what you like else
+ /* do what you like else */
....
}
@@ -2884,10 +2901,10 @@ struct _snd_pcm_runtime {
<![CDATA[
switch (cmd) {
case SNDRV_PCM_TRIGGER_START:
- // do something to start the PCM engine
+ /* do something to start the PCM engine */
break;
case SNDRV_PCM_TRIGGER_STOP:
- // do something to stop the PCM engine
+ /* do something to stop the PCM engine */
break;
default:
return -EINVAL;
@@ -3071,7 +3088,7 @@ struct _snd_pcm_runtime {
spin_unlock(&chip->lock);
snd_pcm_period_elapsed(chip->substream);
spin_lock(&chip->lock);
- // acknowledge the interrupt if necessary
+ /* acknowledge the interrupt if necessary */
}
....
spin_unlock(&chip->lock);
@@ -3134,7 +3151,7 @@ struct _snd_pcm_runtime {
snd_pcm_period_elapsed(substream);
spin_lock(&chip->lock);
}
- // acknowledge the interrupt if necessary
+ /* acknowledge the interrupt if necessary */
}
....
spin_unlock(&chip->lock);
@@ -3456,6 +3473,13 @@ struct _snd_pcm_runtime {
</para>
<para>
+ The <structfield>tlv</structfield> field can be used to provide
+ metadata about the control; see the
+ <link linkend="control-interface-tlv">
+ <citetitle>Metadata</citetitle></link> subsection.
+ </para>
+
+ <para>
The other three are
<link linkend="control-interface-callbacks"><citetitle>
callback functions</citetitle></link>.
@@ -3604,7 +3628,7 @@ struct _snd_pcm_runtime {
<title>Example of info callback</title>
<programlisting>
<![CDATA[
- static int snd_myctl_info(struct snd_kcontrol *kcontrol,
+ static int snd_myctl_mono_info(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_info *uinfo)
{
uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN;
@@ -3639,7 +3663,7 @@ struct _snd_pcm_runtime {
<informalexample>
<programlisting>
<![CDATA[
- static int snd_myctl_info(struct snd_kcontrol *kcontrol,
+ static int snd_myctl_enum_info(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_info *uinfo)
{
static char *texts[4] = {
@@ -3658,6 +3682,16 @@ struct _snd_pcm_runtime {
</programlisting>
</informalexample>
</para>
+
+ <para>
+ Some common info callbacks are prepared for easy use:
+ <function>snd_ctl_boolean_mono_info()</function> and
+ <function>snd_ctl_boolean_stereo_info()</function>.
+ Obviously, the former is an info callback for a mono channel
+ boolean item, just like <function>snd_myctl_mono_info</function>
+ above, and the latter is for a stereo channel boolean item.
+ </para>
+
</section>
<section id="control-interface-callbacks-get">
@@ -3794,7 +3828,8 @@ struct _snd_pcm_runtime {
<informalexample>
<programlisting>
<![CDATA[
- if ((err = snd_ctl_add(card, snd_ctl_new1(&my_control, chip))) < 0)
+ err = snd_ctl_add(card, snd_ctl_new1(&my_control, chip));
+ if (err < 0)
return err;
]]>
</programlisting>
@@ -3843,6 +3878,56 @@ struct _snd_pcm_runtime {
</para>
</section>
+ <section id="control-interface-tlv">
+ <title>Metadata</title>
+ <para>
+ To provide information about the dB values of a mixer control, use
+ on of the <constant>DECLARE_TLV_xxx</constant> macros from
+ <filename>&lt;sound/tlv.h&gt;</filename> to define a variable
+ containing this information, set the<structfield>tlv.p
+ </structfield> field to point to this variable, and include the
+ <constant>SNDRV_CTL_ELEM_ACCESS_TLV_READ</constant> flag in the
+ <structfield>access</structfield> field; like this:
+ <informalexample>
+ <programlisting>
+<![CDATA[
+ static DECLARE_TLV_DB_SCALE(db_scale_my_control, -4050, 150, 0);
+
+ static struct snd_kcontrol_new my_control __devinitdata = {
+ ...
+ .access = SNDRV_CTL_ELEM_ACCESS_READWRITE |
+ SNDRV_CTL_ELEM_ACCESS_TLV_READ,
+ ...
+ .tlv.p = db_scale_my_control,
+ };
+]]>
+ </programlisting>
+ </informalexample>
+ </para>
+
+ <para>
+ The <function>DECLARE_TLV_DB_SCALE</function> macro defines
+ information about a mixer control where each step in the control's
+ value changes the dB value by a constant dB amount.
+ The first parameter is the name of the variable to be defined.
+ The second parameter is the minimum value, in units of 0.01 dB.
+ The third parameter is the step size, in units of 0.01 dB.
+ Set the fourth parameter to 1 if the minimum value actually mutes
+ the control.
+ </para>
+
+ <para>
+ The <function>DECLARE_TLV_DB_LINEAR</function> macro defines
+ information about a mixer control where the control's value affects
+ the output linearly.
+ The first parameter is the name of the variable to be defined.
+ The second parameter is the minimum value, in units of 0.01 dB.
+ The third parameter is the maximum value, in units of 0.01 dB.
+ If the minimum value mutes the control, set the second parameter to
+ <constant>TLV_DB_GAIN_MUTE</constant>.
+ </para>
+ </section>
+
</chapter>
@@ -3880,7 +3965,7 @@ struct _snd_pcm_runtime {
{
struct mychip *chip = ac97->private_data;
....
- // read a register value here from the codec
+ /* read a register value here from the codec */
return the_register_value;
}
@@ -3889,7 +3974,7 @@ struct _snd_pcm_runtime {
{
struct mychip *chip = ac97->private_data;
....
- // write the given register value to the codec
+ /* write the given register value to the codec */
}
static int snd_mychip_ac97(struct mychip *chip)
@@ -3902,7 +3987,8 @@ struct _snd_pcm_runtime {
.read = snd_mychip_ac97_read,
};
- if ((err = snd_ac97_bus(chip->card, 0, &ops, NULL, &bus)) < 0)
+ err = snd_ac97_bus(chip->card, 0, &ops, NULL, &bus);
+ if (err < 0)
return err;
memset(&ac97, 0, sizeof(ac97));
ac97.private_data = chip;
@@ -4447,10 +4533,10 @@ struct _snd_pcm_runtime {
<informalexample>
<programlisting>
<![CDATA[
- struct list_head *list;
struct snd_rawmidi_substream *substream;
- list_for_each(list, &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams) {
- substream = list_entry(list, struct snd_rawmidi_substream, list);
+ list_for_each_entry(substream,
+ &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams,
+ list {
sprintf(substream->name, "My MIDI Port %d", substream->number + 1);
}
/* same for SNDRV_RAWMIDI_STREAM_INPUT */
diff --git a/Documentation/sound/alsa/OSS-Emulation.txt b/Documentation/sound/alsa/OSS-Emulation.txt
index bfa0c9aacb4..022aaeb0e9d 100644
--- a/Documentation/sound/alsa/OSS-Emulation.txt
+++ b/Documentation/sound/alsa/OSS-Emulation.txt
@@ -303,10 +303,3 @@ ICE1712 supports only the unconventional format, interleaved
the buffer as the conventional (mono or 2-channels, 8 or 16bit) format
on OSS.
-USB devices
------------
-Some USB devices support only 24bit format packed in 3bytes. This
-format is not supported by OSS and no conversion is provided by kernel
-OSS emulation. You can use the user-space OSS emulation via libaoss
-instead.
-
diff --git a/Documentation/sound/alsa/hda_codec.txt b/Documentation/sound/alsa/hda_codec.txt
index 4eaae2a4553..8e1b0252669 100644
--- a/Documentation/sound/alsa/hda_codec.txt
+++ b/Documentation/sound/alsa/hda_codec.txt
@@ -49,6 +49,9 @@ struct hda_bus_ops {
unsigned int verb, unsigned int parm);
unsigned int (*get_response)(struct hda_codec *codec);
void (*private_free)(struct hda_bus *);
+#ifdef CONFIG_SND_HDA_POWER_SAVE
+ void (*pm_notify)(struct hda_codec *codec);
+#endif
};
The command callback is called when the codec module needs to send a
@@ -56,9 +59,16 @@ VERB to the controller. It's always a single command.
The get_response callback is called when the codec requires the answer
for the last command. These two callbacks are mandatory and have to
be given.
-The last, private_free callback, is optional. It's called in the
+The third, private_free callback, is optional. It's called in the
destructor to release any necessary data in the lowlevel driver.
+The pm_notify callback is available only with
+CONFIG_SND_HDA_POWER_SAVE kconfig. It's called when the codec needs
+to power up or may power down. The controller should check the all
+belonging codecs on the bus whether they are actually powered off
+(check codec->power_on), and optionally the driver may power down the
+contoller side, too.
+
The bus instance is created via snd_hda_bus_new(). You need to pass
the card instance, the template, and the pointer to store the
resultant bus instance.
@@ -86,10 +96,8 @@ resultant codec instance (can be NULL if not needed).
The codec is stored in a linked list of bus instance. You can follow
the codec list like:
- struct list_head *p;
struct hda_codec *codec;
- list_for_each(p, &bus->codec_list) {
- codec = list_entry(p, struct hda_codec, list);
+ list_for_each_entry(codec, &bus->codec_list, list) {
...
}
@@ -100,10 +108,15 @@ initialization sequence is called when the controls are built later.
Codec Access
============
-To access codec, use snd_codec_read() and snd_codec_write().
+To access codec, use snd_hda_codec_read() and snd_hda_codec_write().
snd_hda_param_read() is for reading parameters.
For writing a sequence of verbs, use snd_hda_sequence_write().
+There are variants of cached read/write, snd_hda_codec_write_cache(),
+snd_hda_sequence_write_cache(). These are used for recording the
+register states for the power-mangement resume. When no PM is needed,
+these are equivalent with non-cached version.
+
To retrieve the number of sub nodes connected to the given node, use
snd_hda_get_sub_nodes(). The connection list can be obtained via
snd_hda_get_connections() call.
@@ -239,6 +252,10 @@ set the codec->patch_ops field. This is defined as below:
int (*suspend)(struct hda_codec *codec, pm_message_t state);
int (*resume)(struct hda_codec *codec);
#endif
+ #ifdef CONFIG_SND_HDA_POWER_SAVE
+ int (*check_power_status)(struct hda_codec *codec,
+ hda_nid_t nid);
+ #endif
};
The build_controls callback is called from snd_hda_build_controls().
@@ -251,6 +268,18 @@ The unsol_event callback is called when an unsolicited event is
received.
The suspend and resume callbacks are for power management.
+They can be NULL if no special sequence is required. When the resume
+callback is NULL, the driver calls the init callback and resumes the
+registers from the cache. If other handling is needed, you'd need to
+write your own resume callback. There, the amp values can be resumed
+via
+ void snd_hda_codec_resume_amp(struct hda_codec *codec);
+and the other codec registers via
+ void snd_hda_codec_resume_cache(struct hda_codec *codec);
+
+The check_power_status callback is called when the amp value of the
+given widget NID is changed. The codec code can turn on/off the power
+appropriately from this information.
Each entry can be NULL if not necessary to be called.
@@ -267,8 +296,7 @@ Digital I/O
===========
Call snd_hda_create_spdif_out_ctls() from the patch to create controls
-related with SPDIF out. In the patch resume callback, call
-snd_hda_resume_spdif().
+related with SPDIF out.
Helper Functions
@@ -284,12 +312,7 @@ as a module parameter, and PCI subsystem IDs. If the matching entry
is found, it returns the config field value.
snd_hda_add_new_ctls() can be used to create and add control entries.
-Pass the zero-terminated array of struct snd_kcontrol_new. The same array
-can be passed to snd_hda_resume_ctls() for resume.
-Note that this will call control->put callback of these entries. So,
-put callback should check codec->in_resume and force to restore the
-given value if it's non-zero even if the value is identical with the
-cached value.
+Pass the zero-terminated array of struct snd_kcontrol_new
Macros HDA_CODEC_VOLUME(), HDA_CODEC_MUTE() and their variables can be
used for the entry of struct snd_kcontrol_new.
diff --git a/Documentation/sound/alsa/powersave.txt b/Documentation/sound/alsa/powersave.txt
new file mode 100644
index 00000000000..9657e809922
--- /dev/null
+++ b/Documentation/sound/alsa/powersave.txt
@@ -0,0 +1,41 @@
+Notes on Power-Saving Mode
+==========================
+
+AC97 and HD-audio drivers have the automatic power-saving mode.
+This feature is enabled via Kconfig CONFIG_SND_AC97_POWER_SAVE
+and CONFIG_SND_HDA_POWER_SAVE options, respectively.
+
+With the automatic power-saving, the driver turns off the codec power
+appropriately when no operation is required. When no applications use
+the device and/or no analog loopback is set, the power disablement is
+done fully or partially. It'll save a certain power consumption, thus
+good for laptops (even for desktops).
+
+The time-out for automatic power-off can be specified via power_save
+module option of snd-ac97-codec and snd-hda-intel modules. Specify
+the time-out value in seconds. 0 means to disable the automatic
+power-saving. The default value of timeout is given via
+CONFIG_SND_AC97_POWER_SAVE_DEFAULT and
+CONFIG_SND_HDA_POWER_SAVE_DEFAULT Kconfig options. Setting this to 1
+(the minimum value) isn't recommended because many applications try to
+reopen the device frequently. 10 would be a good choice for normal
+operations.
+
+The power_save option is exported as writable. This means you can
+adjust the value via sysfs on the fly. For example, to turn on the
+automatic power-save mode with 10 seconds, write to
+/sys/modules/snd_ac97_codec/parameters/power_save (usually as root):
+
+ # echo 10 > /sys/modules/snd_ac97_codec/parameters/power_save
+
+
+Note that you might hear click noise/pop when changing the power
+state. Also, it often takes certain time to wake up from the
+power-down to the active state. These are often hardly to fix, so
+don't report extra bug reports unless you have a fix patch ;-)
+
+For HD-audio interface, there is another module option,
+power_save_controller. This enables/disables the power-save mode of
+the controller side. Setting this on may reduce a bit more power
+consumption, but might result in longer wake-up time and click noise.
+Try to turn it off when you experience such a thing too often.
generated by cgit v1.2.3-18-g5258 (git 2.32.0) at 2024-12-24 17:52:37 +0000