[alsa-devel] [PATCH v2] sound azt3328: add custom AC97 semi-emulation, to be able to use standard ALSA AC97 layer
Andreas Mohr
andi at lisas.de
Sat Feb 19 00:49:32 CET 2011
ChangeLog:
Make use of the very flexible ALSA ac97 layer (hooks for custom I/O!)
on this weird AC97 copycat hardware,
via semi-extended I/O translation/emulation.
Some 5kB binary/loaded size saved (well... additional huge AC97 module
penalty not factored in, of course ;-P).
Given that the driver previously had 20kB that's not bad,
but the much more important thing is to have AC97 layer stress-tested
with a thoroughly weird AC97 copycat (or, simply put, if it were not for
this AC97 test aspect, this effort would merely have been a nut job ;).
v2:
- select Kconfig SND_AC97_CODEC, unconditionally activate AC97 mode
- took the liberty of adding a driver features description
during this Kconfig update
Signed-off-by: Andreas Mohr <andi at lisas.de>
---
The semi-emulated AC97 constellation appears to be working fine.
Planning to remove old custom mixer parts if AC97-based operation holds
water.
Patch created on -rc3, tested and checkpatch.pl'd.
GIT history seems clean, should thus apply easily.
Thanks!
Index: linux-2.6/sound/pci/azt3328.c
===================================================================
--- linux-2.6.orig/sound/pci/azt3328.c 2011-02-16 23:18:59.000000000 +0100
+++ linux-2.6/sound/pci/azt3328.c 2011-02-19 00:23:46.000000000 +0100
@@ -1,6 +1,5 @@
-/*
- * azt3328.c - driver for Aztech AZF3328 based soundcards (e.g. PCI168).
- * Copyright (C) 2002, 2005 - 2010 by Andreas Mohr <andi AT lisas.de>
+/* azt3328.c - driver for Aztech AZF3328 based soundcards (e.g. PCI168).
+ * Copyright (C) 2002, 2005 - 2011 by Andreas Mohr <andi AT lisas.de>
*
* Framework borrowed from Bart Hartgers's als4000.c.
* Driver developed on PCI168 AP(W) version (PCI rev. 10, subsystem ID 1801),
@@ -66,6 +65,13 @@
* addresses illegally. So far unfortunately it looks like the very flexible
* ALSA AC97 support is still not enough to easily compensate for such a
* grave layout violation despite all tweaks and quirks mechanisms it offers.
+ * Well, not quite: now ac97 layer is much improved (bus-specific ops!),
+ * thus I was able to implement support - it's actually working quite well.
+ * An interesting item might be Aztech AMR 2800-W, since it's an AC97
+ * modem card which might reveal the Aztech-specific codec ID which
+ * we might want to pretend, too. Dito PCI168's brother, PCI368,
+ * where the advertising datasheet says it's AC97-based and has a
+ * Digital Enhanced Game Port.
* - builtin genuine OPL3 - verified to work fine, 20080506
* - full duplex 16bit playback/record at independent sampling rate
* - MPU401 (+ legacy address support, claimed by one official spec sheet)
@@ -189,6 +195,16 @@
#include <sound/mpu401.h>
#include <sound/opl3.h>
#include <sound/initval.h>
+/*
+ * Config switch, to use ALSA's AC97 layer instead of old custom mixer crap.
+ * If the AC97 compatibility parts we needed to implement locally turn out
+ * to work nicely, then remove the old implementation eventually.
+ */
+#define AZF_USE_AC97_LAYER 1
+
+#ifdef AZF_USE_AC97_LAYER
+#include <sound/ac97_codec.h>
+#endif
#include "azt3328.h"
MODULE_AUTHOR("Andreas Mohr <andi AT lisas.de>");
@@ -328,6 +344,10 @@
/* playback, recording and I2S out codecs */
struct snd_azf3328_codec_data codecs[3];
+#ifdef AZF_USE_AC97_LAYER
+ struct snd_ac97 *ac97;
+#endif
+
struct snd_card *card;
struct snd_rawmidi *rmidi;
@@ -506,7 +526,7 @@
#define AZF_MUTE_BIT 0x80
static bool
-snd_azf3328_mixer_set_mute(const struct snd_azf3328 *chip,
+snd_azf3328_mixer_mute_control(const struct snd_azf3328 *chip,
unsigned reg, bool do_mute
)
{
@@ -521,6 +541,323 @@
return (do_mute) ? !updated : updated;
}
+static inline bool
+snd_azf3328_mixer_mute_control_master(const struct snd_azf3328 *chip,
+ bool do_mute
+)
+{
+ return snd_azf3328_mixer_mute_control(
+ chip,
+ IDX_MIXER_PLAY_MASTER,
+ do_mute
+ );
+}
+
+static inline bool
+snd_azf3328_mixer_mute_control_pcm(const struct snd_azf3328 *chip,
+ bool do_mute
+)
+{
+ return snd_azf3328_mixer_mute_control(
+ chip,
+ IDX_MIXER_WAVEOUT,
+ do_mute
+ );
+}
+
+static inline void
+snd_azf3328_mixer_reset(const struct snd_azf3328 *chip)
+{
+ /* reset (close) mixer:
+ * first mute master volume, then reset
+ */
+ snd_azf3328_mixer_mute_control_master(chip, 1);
+ snd_azf3328_mixer_outw(chip, IDX_MIXER_RESET, 0x0000);
+}
+
+#ifdef AZF_USE_AC97_LAYER
+
+static inline void
+snd_azf3328_mixer_ac97_map_unsupported(unsigned short reg, const char *mode)
+{
+ /* need to add some more or less clever emulation? */
+ printk(KERN_WARNING
+ "azt3328: missing %s emulation for AC97 register 0x%02x!\n",
+ mode, reg);
+}
+
+/*
+ * Need to have _special_ AC97 mixer hardware register index mapper,
+ * to compensate for the issue of a rather AC97-incompatible hardware layout.
+ */
+#define AZF_REG_MASK 0x3f
+#define AZF_AC97_REG_UNSUPPORTED 0x8000
+#define AZF_AC97_REG_REAL_IO_READ 0x4000
+#define AZF_AC97_REG_REAL_IO_WRITE 0x2000
+#define AZF_AC97_REG_REAL_IO_RW \
+ (AZF_AC97_REG_REAL_IO_READ | AZF_AC97_REG_REAL_IO_WRITE)
+#define AZF_AC97_REG_EMU_IO_READ 0x0400
+#define AZF_AC97_REG_EMU_IO_WRITE 0x0200
+#define AZF_AC97_REG_EMU_IO_RW \
+ (AZF_AC97_REG_EMU_IO_READ | AZF_AC97_REG_EMU_IO_WRITE)
+static unsigned short
+snd_azf3328_mixer_ac97_map_reg_idx(unsigned short reg)
+{
+ static const struct {
+ unsigned short azf_reg;
+ } azf_reg_mapper[] = {
+ /* Especially when taking into consideration
+ * mono/stereo-based sequence of azf vs. AC97 control series,
+ * it's quite obvious that azf simply got rid
+ * of the AC97_HEADPHONE control at its intended offset,
+ * thus shifted _all_ controls by one,
+ * and _then_ simply added it as an FMSYNTH control at the end,
+ * to make up for the offset.
+ * This means we'll have to translate indices here as
+ * needed and then do some tiny AC97 patch action
+ * (snd_ac97_rename_vol_ctl() etc.) - that's it.
+ */
+ { /* AC97_RESET */ IDX_MIXER_RESET
+ | AZF_AC97_REG_REAL_IO_WRITE
+ | AZF_AC97_REG_EMU_IO_READ },
+ { /* AC97_MASTER */ IDX_MIXER_PLAY_MASTER },
+ /* note large shift: AC97_HEADPHONE to IDX_MIXER_FMSYNTH! */
+ { /* AC97_HEADPHONE */ IDX_MIXER_FMSYNTH },
+ { /* AC97_MASTER_MONO */ IDX_MIXER_MODEMOUT },
+ { /* AC97_MASTER_TONE */ IDX_MIXER_BASSTREBLE },
+ { /* AC97_PC_BEEP */ IDX_MIXER_PCBEEP },
+ { /* AC97_PHONE */ IDX_MIXER_MODEMIN },
+ { /* AC97_MIC */ IDX_MIXER_MIC },
+ { /* AC97_LINE */ IDX_MIXER_LINEIN },
+ { /* AC97_CD */ IDX_MIXER_CDAUDIO },
+ { /* AC97_VIDEO */ IDX_MIXER_VIDEO },
+ { /* AC97_AUX */ IDX_MIXER_AUX },
+ { /* AC97_PCM */ IDX_MIXER_WAVEOUT },
+ { /* AC97_REC_SEL */ IDX_MIXER_REC_SELECT },
+ { /* AC97_REC_GAIN */ IDX_MIXER_REC_VOLUME },
+ { /* AC97_REC_GAIN_MIC */ AZF_AC97_REG_EMU_IO_RW },
+ { /* AC97_GENERAL_PURPOSE */ IDX_MIXER_ADVCTL2 },
+ { /* AC97_3D_CONTROL */ IDX_MIXER_ADVCTL1 },
+ };
+
+ unsigned short reg_azf = AZF_AC97_REG_UNSUPPORTED;
+
+ /* azf3328 supports the low-numbered and low-spec:ed range
+ of AC97 regs only */
+ if (reg <= AC97_3D_CONTROL) {
+ unsigned short reg_idx = reg / 2;
+ reg_azf = azf_reg_mapper[reg_idx].azf_reg;
+ /* a translation-only entry means it's real read/write: */
+ if (!(reg_azf & ~AZF_REG_MASK))
+ reg_azf |= AZF_AC97_REG_REAL_IO_RW;
+ } else {
+ switch (reg) {
+ case AC97_POWERDOWN:
+ reg_azf = AZF_AC97_REG_EMU_IO_RW;
+ break;
+ case AC97_EXTENDED_ID:
+ reg_azf = AZF_AC97_REG_EMU_IO_READ;
+ break;
+ case AC97_EXTENDED_STATUS:
+ /* I don't know what the h*ll AC97 layer
+ * would consult this _extended_ register for
+ * given a base-AC97-advertised card,
+ * but let's just emulate it anyway :-P
+ */
+ reg_azf = AZF_AC97_REG_EMU_IO_RW;
+ break;
+ case AC97_VENDOR_ID1:
+ case AC97_VENDOR_ID2:
+ reg_azf = AZF_AC97_REG_EMU_IO_READ;
+ break;
+ }
+ }
+ return reg_azf;
+}
+
+static const unsigned short
+azf_emulated_ac97_caps =
+ AC97_BC_DEDICATED_MIC |
+ AC97_BC_BASS_TREBLE |
+ /* Headphone is an FM Synth control here */
+ AC97_BC_HEADPHONE |
+ /* no AC97_BC_LOUDNESS! */
+ /* mask 0x7c00 is
+ vendor-specific 3D enhancement
+ vendor indicator.
+ Since there actually _is_ an
+ entry for Aztech Labs
+ (13), make damn sure
+ to indicate it. */
+ (13 << 10);
+
+static const unsigned short
+azf_emulated_ac97_powerdown =
+ /* pretend everything to be active */
+ AC97_PD_ADC_STATUS |
+ AC97_PD_DAC_STATUS |
+ AC97_PD_MIXER_STATUS |
+ AC97_PD_VREF_STATUS;
+
+/*
+ * Emulated, _inofficial_ vendor ID
+ * (there might be some devices such as the MR 2800-W
+ * which could reveal the real Aztech AC97 ID).
+ * We choose to use "AZT" prefix, and then use 1 to indicate PCI168
+ * (better don't use 0x68 since there's a PCI368 as well).
+ */
+static const unsigned int
+azf_emulated_ac97_vendor_id = 0x415a5401;
+
+static unsigned short
+snd_azf3328_mixer_ac97_read(struct snd_ac97 *ac97, unsigned short reg_ac97)
+{
+ const struct snd_azf3328 *chip = ac97->private_data;
+ unsigned short reg_azf = snd_azf3328_mixer_ac97_map_reg_idx(reg_ac97);
+ unsigned short reg_val = 0;
+ bool unsupported = 0;
+
+ snd_azf3328_dbgmixer(
+ "snd_azf3328_mixer_ac97_read reg_ac97 %u\n",
+ reg_ac97
+ );
+ if (reg_azf & AZF_AC97_REG_UNSUPPORTED)
+ unsupported = 1;
+ else {
+ if (reg_azf & AZF_AC97_REG_REAL_IO_READ)
+ reg_val = snd_azf3328_mixer_inw(chip,
+ reg_azf & AZF_REG_MASK);
+ else {
+ /*
+ * Proceed with dummy I/O read,
+ * to ensure compatible timing where this may matter.
+ * (ALSA AC97 layer usually doesn't call I/O functions
+ * due to intelligent I/O caching anyway)
+ * Choose a mixer register that's thoroughly unrelated
+ * to common audio (try to minimize distortion).
+ */
+ snd_azf3328_mixer_inw(chip, IDX_MIXER_SOMETHING30H);
+ }
+
+ if (reg_azf & AZF_AC97_REG_EMU_IO_READ) {
+ switch (reg_ac97) {
+ case AC97_RESET:
+ reg_val |= azf_emulated_ac97_caps;
+ break;
+ case AC97_POWERDOWN:
+ reg_val |= azf_emulated_ac97_powerdown;
+ break;
+ case AC97_EXTENDED_ID:
+ case AC97_EXTENDED_STATUS:
+ /* AFAICS we simply can't support anything: */
+ reg_val |= 0;
+ break;
+ case AC97_VENDOR_ID1:
+ reg_val = azf_emulated_ac97_vendor_id >> 16;
+ break;
+ case AC97_VENDOR_ID2:
+ reg_val = azf_emulated_ac97_vendor_id & 0xffff;
+ break;
+ default:
+ unsupported = 1;
+ break;
+ }
+ }
+ }
+ if (unsupported)
+ snd_azf3328_mixer_ac97_map_unsupported(reg_ac97, "read");
+
+ return reg_val;
+}
+
+static void
+snd_azf3328_mixer_ac97_write(struct snd_ac97 *ac97,
+ unsigned short reg_ac97, unsigned short val)
+{
+ const struct snd_azf3328 *chip = ac97->private_data;
+ unsigned short reg_azf = snd_azf3328_mixer_ac97_map_reg_idx(reg_ac97);
+ bool unsupported = 0;
+
+ snd_azf3328_dbgmixer(
+ "snd_azf3328_mixer_ac97_write reg_ac97 %u val %u\n",
+ reg_ac97, val
+ );
+ if (reg_azf & AZF_AC97_REG_UNSUPPORTED)
+ unsupported = 1;
+ else {
+ if (reg_azf & AZF_AC97_REG_REAL_IO_WRITE)
+ snd_azf3328_mixer_outw(
+ chip,
+ reg_azf & AZF_REG_MASK,
+ val
+ );
+ else
+ if (reg_azf & AZF_AC97_REG_EMU_IO_WRITE) {
+ switch (reg_ac97) {
+ case AC97_REC_GAIN_MIC:
+ case AC97_POWERDOWN:
+ case AC97_EXTENDED_STATUS:
+ /*
+ * Silently swallow these writes.
+ * Since for most registers our card doesn't
+ * actually support a comparable feature,
+ * this is exactly what we should do here.
+ * The AC97 layer's I/O caching probably
+ * automatically takes care of all the rest...
+ * (remembers written values etc.)
+ */
+ break;
+ default:
+ unsupported = 1;
+ break;
+ }
+ }
+ }
+ if (unsupported)
+ snd_azf3328_mixer_ac97_map_unsupported(reg_ac97, "write");
+}
+
+static int __devinit
+snd_azf3328_mixer_new(struct snd_azf3328 *chip)
+{
+ struct snd_ac97_bus *bus;
+ struct snd_ac97_template ac97;
+ static struct snd_ac97_bus_ops ops = {
+ .write = snd_azf3328_mixer_ac97_write,
+ .read = snd_azf3328_mixer_ac97_read,
+ };
+ int rc;
+
+ memset(&ac97, 0, sizeof(ac97));
+ ac97.scaps = AC97_SCAP_SKIP_MODEM
+ | AC97_SCAP_AUDIO /* we support audio! */
+ | AC97_SCAP_NO_SPDIF;
+ ac97.private_data = chip;
+ ac97.pci = chip->pci;
+
+ /*
+ * ALSA's AC97 layer has terrible init crackling issues,
+ * unfortunately, and since it makes use of AC97_RESET,
+ * there's no use trying to mute Master Playback proactively.
+ */
+
+ rc = snd_ac97_bus(chip->card, 0, &ops, NULL, &bus);
+ if (!rc)
+ rc = snd_ac97_mixer(bus, &ac97, &chip->ac97);
+ /*
+ * Make sure to complain loudly in case of AC97 init failure,
+ * since failure may happen quite often,
+ * due to this card being a very quirky AC97 "lookalike".
+ */
+ if (rc)
+ printk(KERN_ERR "azt3328: AC97 init failed, err %d!\n", rc);
+
+ /* If we return an error here, then snd_card_free() should
+ * free up any ac97 codecs that got created, as well as the bus.
+ */
+ return rc;
+}
+#else /* AZF_USE_AC97_LAYER */
static void
snd_azf3328_mixer_write_volume_gradually(const struct snd_azf3328 *chip,
unsigned reg,
@@ -945,6 +1282,7 @@
snd_azf3328_dbgcallleave();
return 0;
}
+#endif /* AZF_USE_AC97_LAYER */
static int
snd_azf3328_hw_params(struct snd_pcm_substream *substream,
@@ -1233,8 +1571,8 @@
if (is_main_mixer_playback_codec) {
/* mute WaveOut (avoid clicking during setup) */
previously_muted =
- snd_azf3328_mixer_set_mute(
- chip, IDX_MIXER_WAVEOUT, 1
+ snd_azf3328_mixer_mute_control_pcm(
+ chip, 1
);
}
@@ -1290,8 +1628,8 @@
if (is_main_mixer_playback_codec) {
/* now unmute WaveOut */
if (!previously_muted)
- snd_azf3328_mixer_set_mute(
- chip, IDX_MIXER_WAVEOUT, 0
+ snd_azf3328_mixer_mute_control_pcm(
+ chip, 0
);
}
@@ -1315,8 +1653,8 @@
if (is_main_mixer_playback_codec) {
/* mute WaveOut (avoid clicking during setup) */
previously_muted =
- snd_azf3328_mixer_set_mute(
- chip, IDX_MIXER_WAVEOUT, 1
+ snd_azf3328_mixer_mute_control_pcm(
+ chip, 1
);
}
@@ -1341,8 +1679,8 @@
if (is_main_mixer_playback_codec) {
/* now unmute WaveOut */
if (!previously_muted)
- snd_azf3328_mixer_set_mute(
- chip, IDX_MIXER_WAVEOUT, 0
+ snd_azf3328_mixer_mute_control_pcm(
+ chip, 0
);
}
@@ -2050,11 +2388,7 @@
if (chip->irq < 0)
goto __end_hw;
- /* reset (close) mixer:
- * first mute master volume, then reset
- */
- snd_azf3328_mixer_set_mute(chip, IDX_MIXER_PLAY_MASTER, 1);
- snd_azf3328_mixer_outw(chip, IDX_MIXER_RESET, 0x0000);
+ snd_azf3328_mixer_reset(chip);
snd_azf3328_timer_stop(chip->timer);
snd_azf3328_gameport_free(chip);
@@ -2407,6 +2741,55 @@
}
}
+static inline void
+snd_azf3328_resume_regs(const u32 *saved_regs,
+ unsigned long io_addr,
+ unsigned count
+)
+{
+ unsigned reg;
+
+ for (reg = 0; reg < count; ++reg) {
+ outl(*saved_regs, io_addr);
+ snd_azf3328_dbgpm("resume: io 0x%04lx: 0x%08x --> 0x%08x\n",
+ io_addr, *saved_regs, inl(io_addr));
+ ++saved_regs;
+ io_addr += sizeof(*saved_regs);
+ }
+}
+
+static inline void
+snd_azf3328_suspend_ac97(struct snd_azf3328 *chip)
+{
+#ifdef AZF_USE_AC97_LAYER
+ snd_ac97_suspend(chip->ac97);
+#else
+ snd_azf3328_suspend_regs(chip->mixer_io,
+ ARRAY_SIZE(chip->saved_regs_mixer), chip->saved_regs_mixer);
+
+ /* make sure to disable master volume etc. to prevent looping sound */
+ snd_azf3328_mixer_mute_control_master(chip, 1);
+ snd_azf3328_mixer_mute_control_pcm(chip, 1);
+#endif /* AZF_USE_AC97_LAYER */
+}
+
+static inline void
+snd_azf3328_resume_ac97(const struct snd_azf3328 *chip)
+{
+#ifdef AZF_USE_AC97_LAYER
+ snd_ac97_resume(chip->ac97);
+#else
+ snd_azf3328_resume_regs(chip->saved_regs_mixer, chip->mixer_io,
+ ARRAY_SIZE(chip->saved_regs_mixer));
+
+ /* unfortunately with 32bit transfers, IDX_MIXER_PLAY_MASTER (0x02)
+ and IDX_MIXER_RESET (offset 0x00) get touched at the same time,
+ resulting in a mixer reset condition persisting until _after_
+ master vol was restored. Thus master vol needs an extra restore. */
+ outw(((u16 *)chip->saved_regs_mixer)[1], chip->mixer_io + 2);
+#endif /* AZF_USE_AC97_LAYER */
+}
+
static int
snd_azf3328_suspend(struct pci_dev *pci, pm_message_t state)
{
@@ -2420,12 +2803,7 @@
snd_pcm_suspend_all(chip->pcm[AZF_CODEC_PLAYBACK]);
snd_pcm_suspend_all(chip->pcm[AZF_CODEC_I2S_OUT]);
- snd_azf3328_suspend_regs(chip->mixer_io,
- ARRAY_SIZE(chip->saved_regs_mixer), chip->saved_regs_mixer);
-
- /* make sure to disable master volume etc. to prevent looping sound */
- snd_azf3328_mixer_set_mute(chip, IDX_MIXER_PLAY_MASTER, 1);
- snd_azf3328_mixer_set_mute(chip, IDX_MIXER_WAVEOUT, 1);
+ snd_azf3328_suspend_ac97(chip);
snd_azf3328_suspend_regs(chip->ctrl_io,
ARRAY_SIZE(chip->saved_regs_ctrl), chip->saved_regs_ctrl);
@@ -2447,23 +2825,6 @@
return 0;
}
-static inline void
-snd_azf3328_resume_regs(const u32 *saved_regs,
- unsigned long io_addr,
- unsigned count
-)
-{
- unsigned reg;
-
- for (reg = 0; reg < count; ++reg) {
- outl(*saved_regs, io_addr);
- snd_azf3328_dbgpm("resume: io 0x%04lx: 0x%08x --> 0x%08x\n",
- io_addr, *saved_regs, inl(io_addr));
- ++saved_regs;
- io_addr += sizeof(*saved_regs);
- }
-}
-
static int
snd_azf3328_resume(struct pci_dev *pci)
{
@@ -2487,14 +2848,7 @@
snd_azf3328_resume_regs(chip->saved_regs_opl3, chip->opl3_io,
ARRAY_SIZE(chip->saved_regs_opl3));
- snd_azf3328_resume_regs(chip->saved_regs_mixer, chip->mixer_io,
- ARRAY_SIZE(chip->saved_regs_mixer));
-
- /* unfortunately with 32bit transfers, IDX_MIXER_PLAY_MASTER (0x02)
- and IDX_MIXER_RESET (offset 0x00) get touched at the same time,
- resulting in a mixer reset condition persisting until _after_
- master vol was restored. Thus master vol needs an extra restore. */
- outw(((u16 *)chip->saved_regs_mixer)[1], chip->mixer_io + 2);
+ snd_azf3328_resume_ac97(chip);
snd_azf3328_resume_regs(chip->saved_regs_ctrl, chip->ctrl_io,
ARRAY_SIZE(chip->saved_regs_ctrl));
Index: linux-2.6/sound/pci/Kconfig
===================================================================
--- linux-2.6.orig/sound/pci/Kconfig 2011-02-18 23:40:38.000000000 +0100
+++ linux-2.6/sound/pci/Kconfig 2011-02-19 00:15:03.000000000 +0100
@@ -152,10 +152,16 @@
select SND_MPU401_UART
select SND_PCM
select SND_RAWMIDI
+ select SND_AC97_CODEC
help
Say Y here to include support for Aztech AZF3328 (PCI168)
soundcards.
+ Supported features: AC97-"conformant" mixer, MPU401/OPL3, analog I/O
+ (16bit/8bit, many sample rates [<= 66.2kHz], NO hardware mixing),
+ Digital Enhanced Game Port, 1.024MHz multimedia sequencer timer,
+ ext. codec (I2S port), onboard amp (4W/4Ohms/ch), suspend/resume.
+
To compile this driver as a module, choose M here: the module
will be called snd-azt3328.
More information about the Alsa-devel
mailing list