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 ;).
The semi-emulated AC97 constellation appears to be working fine.
Planning to remove old custom mixer parts if AC97-based operation holds water.
Signed-off-by: Andreas Mohr andi@lisas.de --- 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 2011-02-16 23:19:02.000000000 +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 +195,19 @@ #include <sound/mpu401.h> #include <sound/opl3.h> #include <sound/initval.h> +/* + * For now, use AC97 layer in case CONFIG_SND_AC97_CODEC is available. + * If our AC97 emulation turns out to work nicely, + * then make it unconditional and remove old custom AC97 crap + * (and Kconfig-select SND_AC97_CODEC). + */ +#if defined(CONFIG_SND_AC97_CODEC) || \ + (defined(MODULE) && defined(CONFIG_SND_AC97_CODEC_MODULE)) + #define AZF_USE_AC97_LAYER 1 +#endif +#ifdef AZF_USE_AC97_LAYER +#include <sound/ac97_codec.h> +#endif #include "azt3328.h"
MODULE_AUTHOR("Andreas Mohr <andi AT lisas.de>"); @@ -328,6 +347,10 @@ /* 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 +529,7 @@ #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 +544,323 @@ 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 +1285,7 @@ snd_azf3328_dbgcallleave(); return 0; } +#endif /* AZF_USE_AC97_LAYER */
static int snd_azf3328_hw_params(struct snd_pcm_substream *substream, @@ -1233,8 +1574,8 @@ 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 +1631,8 @@ 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 +1656,8 @@ 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 +1682,8 @@ 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 +2391,7 @@ 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 +2744,55 @@ } }
+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 +2806,7 @@ 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 +2828,6 @@ 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 +2851,7 @@ 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));