ac97_codec.c

Source files for pxa ac97 sound driver The packet contains the files that is listed below driv

			} else {
				/* these may have 5 or 6 bit resolution */
				if (oss_channel == SOUND_MIXER_VOLUME ||
				    oss_channel == SOUND_MIXER_ALTPCM)
					scale = (1 << codec->bit_resolution);
				else
					scale = mh->scale;

				right = ((100 - right) * scale) / 100;
				left = ((100 - left) * scale) / 100;
				if (right >= scale)
					right = scale-1;
				if (left >= scale)
					left = scale-1;
			}
			val = (left << 8) | right;
		}
	} else if (oss_channel == SOUND_MIXER_BASS) {
		val = codec->codec_read(codec , mh->offset) & ~0x0f00;
		left = ((100 - left) * mh->scale) / 100;
		if (left >= mh->scale)
			left = mh->scale-1;
		val |= (left << 8) & 0x0e00;
	} else if (oss_channel == SOUND_MIXER_TREBLE) {
		val = codec->codec_read(codec , mh->offset) & ~0x000f;
		left = ((100 - left) * mh->scale) / 100;
		if (left >= mh->scale)
			left = mh->scale-1;
		val |= left & 0x000e;
	} else if(left == 0) {
		val = AC97_MUTE;
	} else if (oss_channel == SOUND_MIXER_SPEAKER) {
		left = ((100 - left) * mh->scale) / 100;
		if (left >= mh->scale)
			left = mh->scale-1;
		val = left << 1;
	} else if (oss_channel == SOUND_MIXER_PHONEIN) {
		left = ((100 - left) * mh->scale) / 100;
		if (left >= mh->scale)
			left = mh->scale-1;
		val = left;
	} else if (oss_channel == SOUND_MIXER_PHONEOUT) {
		scale = (1 << codec->bit_resolution);
		left = ((100 - left) * scale) / 100;
		if (left >= mh->scale)
			left = mh->scale-1;
		val = left;
	} else if (oss_channel == SOUND_MIXER_MIC) {
		val = codec->codec_read(codec , mh->offset) & ~0x801f;
		left = ((100 - left) * mh->scale) / 100;
		if (left >= mh->scale)
			left = mh->scale-1;
		val |= left;
		/*  the low bit is optional in the tone sliders and masking
		    it lets us avoid the 0xf 'bypass'.. */
	}
#ifdef DEBUG
	printk(" 0x%04x", val);
#endif

	codec->codec_write(codec, mh->offset, val);

#ifdef DEBUG
	val = codec->codec_read(codec, mh->offset);
	printk(" -> 0x%04x\n", val);
#endif
}

/* a thin wrapper for write_mixer */
static void ac97_set_mixer(struct ac97_codec *codec, unsigned int oss_mixer, unsigned int val ) 
{
	unsigned int left,right;

	/* cleanse input a little */
	right = ((val >> 8)  & 0xff) ;
	left = (val  & 0xff) ;

	if (right > 100) right = 100;
	if (left > 100) left = 100;

	codec->mixer_state[oss_mixer] = (right << 8) | left;
	codec->write_mixer(codec, oss_mixer, left, right);
}

/* read or write the recmask, the ac97 can really have left and right recording
   inputs independantly set, but OSS doesn't seem to want us to express that to
   the user. the caller guarantees that we have a supported bit set, and they
   must be holding the card's spinlock */
static int ac97_recmask_io(struct ac97_codec *codec, int rw, int mask) 
{
	unsigned int val;

	if (rw) {
		/* read it from the card */
		val = codec->codec_read(codec, AC97_RECORD_SELECT);
#ifdef DEBUG
		printk("ac97_codec: ac97 recmask to set to 0x%04x\n", val);
#endif
		return (1 << ac97_rm2oss[val & 0x07]);
	}

	/* else, write the first set in the mask as the
	   output */	
	/* clear out current set value first (AC97 supports only 1 input!) */
	val = (1 << ac97_rm2oss[codec->codec_read(codec, AC97_RECORD_SELECT) & 0x07]);
	if (mask != val)
	    mask &= ~val;
       
	val = ffs(mask); 
	val = ac97_oss_rm[val-1];
	val |= val << 8;  /* set both channels */

#ifdef DEBUG
	printk("ac97_codec: setting ac97 recmask to 0x%04x\n", val);
#endif

	codec->codec_write(codec, AC97_RECORD_SELECT, val);

	return 0;
};

static int ac97_mixer_ioctl(struct ac97_codec *codec, unsigned int cmd, unsigned long arg)
{
	int i, val = 0;

	if (cmd == SOUND_MIXER_INFO) {
		mixer_info info;
		strncpy(info.id, codec->name, sizeof(info.id));
		strncpy(info.name, codec->name, sizeof(info.name));
		info.modify_counter = codec->modcnt;
		if (copy_to_user((void *)arg, &info, sizeof(info)))
			return -EFAULT;
		return 0;
	}
	if (cmd == SOUND_OLD_MIXER_INFO) {
		_old_mixer_info info;
		strncpy(info.id, codec->name, sizeof(info.id));
		strncpy(info.name, codec->name, sizeof(info.name));
		if (copy_to_user((void *)arg, &info, sizeof(info)))
			return -EFAULT;
		return 0;
	}

	if (_IOC_TYPE(cmd) != 'M' || _SIOC_SIZE(cmd) != sizeof(int))
		return -EINVAL;

	if (cmd == OSS_GETVERSION)
		return put_user(SOUND_VERSION, (int *)arg);

	if (_SIOC_DIR(cmd) == _SIOC_READ) {
		switch (_IOC_NR(cmd)) {
		case SOUND_MIXER_RECSRC: /* give them the current record source */
			if (!codec->recmask_io) {
				val = 0;
			} else {
				val = codec->recmask_io(codec, 1, 0);
			}
			break;

		case SOUND_MIXER_DEVMASK: /* give them the supported mixers */
			val = codec->supported_mixers;
			break;

		case SOUND_MIXER_RECMASK: /* Arg contains a bit for each supported recording source */
			val = codec->record_sources;
			break;

		case SOUND_MIXER_STEREODEVS: /* Mixer channels supporting stereo */
			val = codec->stereo_mixers;
			break;

		case SOUND_MIXER_CAPS:
			val = SOUND_CAP_EXCL_INPUT;
			break;

		default: /* read a specific mixer */
			i = _IOC_NR(cmd);

			if (!supported_mixer(codec, i)) 
				return -EINVAL;

			/* do we ever want to touch the hardware? */
		        /* val = codec->read_mixer(codec, i); */
			val = codec->mixer_state[i];
 			break;
		}
		return put_user(val, (int *)arg);
	}

	if (_SIOC_DIR(cmd) == (_SIOC_WRITE|_SIOC_READ)) {
		codec->modcnt++;
		if (get_user(val, (int *)arg))
			return -EFAULT;

		switch (_IOC_NR(cmd)) {
		case SOUND_MIXER_RECSRC: /* Arg contains a bit for each recording source */
			if (!codec->recmask_io) return -EINVAL;
			if (!val) return 0;
			if (!(val &= codec->record_sources)) return -EINVAL;

			codec->recmask_io(codec, 0, val);

			return 0;
		default: /* write a specific mixer */
			i = _IOC_NR(cmd);

			if (!supported_mixer(codec, i)) 
				return -EINVAL;

			ac97_set_mixer(codec, i, val);

			return 0;
		}
	}
	return -EINVAL;
}

/* entry point for /proc/driver/controller_vendor/ac97/%d */
int ac97_read_proc (char *page, char **start, off_t off,
		    int count, int *eof, void *data)
{
	int len = 0, cap, extid, val, id1, id2;
	struct ac97_codec *codec;
	int is_ac97_20 = 0;

	if ((codec = data) == NULL)
		return -ENODEV;

	id1 = codec->codec_read(codec, AC97_VENDOR_ID1);
	id2 = codec->codec_read(codec, AC97_VENDOR_ID2);
	len += sprintf (page+len, "Vendor name      : %s\n", codec->name);
	len += sprintf (page+len, "Vendor id        : %04X %04X\n", id1, id2);

	extid = codec->codec_read(codec, AC97_EXTENDED_ID);
	extid &= ~((1<<2)|(1<<4)|(1<<5)|(1<<10)|(1<<11)|(1<<12)|(1<<13));
	len += sprintf (page+len, "AC97 Version     : %s\n",
			extid ? "2.0 or later" : "1.0");
	if (extid) is_ac97_20 = 1;

	cap = codec->codec_read(codec, AC97_RESET);
	len += sprintf (page+len, "Capabilities     :%s%s%s%s%s%s\n",
			cap & 0x0001 ? " -dedicated MIC PCM IN channel-" : "",
			cap & 0x0002 ? " -reserved1-" : "",
			cap & 0x0004 ? " -bass & treble-" : "",
			cap & 0x0008 ? " -simulated stereo-" : "",
			cap & 0x0010 ? " -headphone out-" : "",
			cap & 0x0020 ? " -loudness-" : "");
	val = cap & 0x00c0;
	len += sprintf (page+len, "DAC resolutions  :%s%s%s\n",
			" -16-bit-",
			val & 0x0040 ? " -18-bit-" : "",
			val & 0x0080 ? " -20-bit-" : "");
	val = cap & 0x0300;
	len += sprintf (page+len, "ADC resolutions  :%s%s%s\n",
			" -16-bit-",
			val & 0x0100 ? " -18-bit-" : "",
			val & 0x0200 ? " -20-bit-" : "");
	len += sprintf (page+len, "3D enhancement   : %s\n",
			ac97_stereo_enhancements[(cap >> 10) & 0x1f]);

	val = codec->codec_read(codec, AC97_GENERAL_PURPOSE);
	len += sprintf (page+len, "POP path         : %s 3D\n"
			"Sim. stereo      : %s\n"
			"3D enhancement   : %s\n"
			"Loudness         : %s\n"
			"Mono output      : %s\n"
			"MIC select       : %s\n"
			"ADC/DAC loopback : %s\n",
			val & 0x8000 ? "post" : "pre",
			val & 0x4000 ? "on" : "off",
			val & 0x2000 ? "on" : "off",
			val & 0x1000 ? "on" : "off",
			val & 0x0200 ? "MIC" : "MIX",
			val & 0x0100 ? "MIC2" : "MIC1",
			val & 0x0080 ? "on" : "off");

	extid = codec->codec_read(codec, AC97_EXTENDED_ID);
	cap = extid;
	len += sprintf (page+len, "Ext Capabilities :%s%s%s%s%s%s%s\n",
			cap & 0x0001 ? " -var rate PCM audio-" : "",
			cap & 0x0002 ? " -2x PCM audio out-" : "",
			cap & 0x0008 ? " -var rate MIC in-" : "",
			cap & 0x0040 ? " -PCM center DAC-" : "",
			cap & 0x0080 ? " -PCM surround DAC-" : "",
			cap & 0x0100 ? " -PCM LFE DAC-" : "",
			cap & 0x0200 ? " -slot/DAC mappings-" : "");
	if (is_ac97_20) {
		len += sprintf (page+len, "Front DAC rate   : %d\n",
				codec->codec_read(codec, AC97_PCM_FRONT_DAC_RATE));
	}

	return len;
}

/**
 *	ac97_probe_codec - Initialize and setup AC97-compatible codec
 *	@codec: (in/out) Kernel info for a single AC97 codec
 *
 *	Reset the AC97 codec, then initialize the mixer and
 *	the rest of the @codec structure.
 *
 *	The codec_read and codec_write fields of @codec are
 *	required to be setup and working when this function
 *	is called.  All other fields are set by this function.
 *
 *	codec_wait field of @codec can optionally be provided
 *	when calling this function.  If codec_wait is not %NULL,
 *	this function will call codec_wait any time it is
 *	necessary to wait for the audio chip to reach the
 *	codec-ready state.  If codec_wait is %NULL, then
 *	the default behavior is to call schedule_timeout.
 *	Currently codec_wait is used to wait for AC97 codec
 *	reset to complete. 
 *
 *	Returns 1 (true) on success, or 0 (false) on failure.
 */
 
int ac97_probe_codec(struct ac97_codec *codec)
{
	u16 id1, id2;
	u16 audio, modem;
	int i;

	/* probing AC97 codec, AC97 2.0 says that bit 15 of register 0x00 (reset) should 
	 * be read zero.
	 *
	 * FIXME: is the following comment outdated?  -jgarzik 
	 * Probing of AC97 in this way is not reliable, it is not even SAFE !!
	 */
	codec->codec_write(codec, AC97_RESET, 0L);

	/* also according to spec, we wait for codec-ready state */	
	if (codec->codec_wait)
		codec->codec_wait(codec);
	else
		udelay(10);

	if ((audio = codec->codec_read(codec, AC97_RESET)) & 0x8000) {
		printk(KERN_ERR "ac97_codec: %s ac97 codec not present\n",
		       codec->id ? "Secondary" : "Primary");
		return 0;
	}

	/* probe for Modem Codec */
	codec->codec_write(codec, AC97_EXTENDED_MODEM_ID, 0L);
	modem = codec->codec_read(codec, AC97_EXTENDED_MODEM_ID);

	codec->name = NULL;
	codec->codec_ops = &null_ops;

	id1 = codec->codec_read(codec, AC97_VENDOR_ID1);