mixer_oss.c

linux-2.6.15.6

static void snd_mixer_oss_slot_free(snd_mixer_oss_slot_t *chn)
{
	struct slot *p = (struct slot *)chn->private_data;
	if (p) {
		if (p->allocated && p->assigned) {
			kfree(p->assigned->name);
			kfree(p->assigned);
		}
		kfree(p);
	}
}

static void mixer_slot_clear(snd_mixer_oss_slot_t *rslot)
{
	int idx = rslot->number; /* remember this */
	if (rslot->private_free)
		rslot->private_free(rslot);
	memset(rslot, 0, sizeof(*rslot));
	rslot->number = idx;
}

/*
 * build an OSS mixer element.
 * ptr_allocated means the entry is dynamically allocated (change via proc file).
 * when replace_old = 1, the old entry is replaced with the new one.
 */
static int snd_mixer_oss_build_input(snd_mixer_oss_t *mixer, struct snd_mixer_oss_assign_table *ptr, int ptr_allocated, int replace_old)
{
	struct slot slot;
	struct slot *pslot;
	snd_kcontrol_t *kctl;
	snd_mixer_oss_slot_t *rslot;
	char str[64];	
	
	/* check if already assigned */
	if (mixer->slots[ptr->oss_id].get_volume && ! replace_old)
		return 0;

	memset(&slot, 0, sizeof(slot));
	memset(slot.numid, 0xff, sizeof(slot.numid)); /* ID_UNKNOWN */
	if (snd_mixer_oss_build_test(mixer, &slot, ptr->name, ptr->index,
				     SNDRV_MIXER_OSS_ITEM_GLOBAL))
		return 0;
	sprintf(str, "%s Switch", ptr->name);
	if (snd_mixer_oss_build_test(mixer, &slot, str, ptr->index,
				     SNDRV_MIXER_OSS_ITEM_GSWITCH))
		return 0;
	sprintf(str, "%s Route", ptr->name);
	if (snd_mixer_oss_build_test(mixer, &slot, str, ptr->index,
				     SNDRV_MIXER_OSS_ITEM_GROUTE))
		return 0;
	sprintf(str, "%s Volume", ptr->name);
	if (snd_mixer_oss_build_test(mixer, &slot, str, ptr->index,
				     SNDRV_MIXER_OSS_ITEM_GVOLUME))
		return 0;
	sprintf(str, "%s Playback Switch", ptr->name);
	if (snd_mixer_oss_build_test(mixer, &slot, str, ptr->index,
				     SNDRV_MIXER_OSS_ITEM_PSWITCH))
		return 0;
	sprintf(str, "%s Playback Route", ptr->name);
	if (snd_mixer_oss_build_test(mixer, &slot, str, ptr->index,
				     SNDRV_MIXER_OSS_ITEM_PROUTE))
		return 0;
	sprintf(str, "%s Playback Volume", ptr->name);
	if (snd_mixer_oss_build_test(mixer, &slot, str, ptr->index,
				     SNDRV_MIXER_OSS_ITEM_PVOLUME))
		return 0;
	sprintf(str, "%s Capture Switch", ptr->name);
	if (snd_mixer_oss_build_test(mixer, &slot, str, ptr->index,
				     SNDRV_MIXER_OSS_ITEM_CSWITCH))
		return 0;
	sprintf(str, "%s Capture Route", ptr->name);
	if (snd_mixer_oss_build_test(mixer, &slot, str, ptr->index,
				     SNDRV_MIXER_OSS_ITEM_CROUTE))
		return 0;
	sprintf(str, "%s Capture Volume", ptr->name);
	if (snd_mixer_oss_build_test(mixer, &slot, str, ptr->index,
				     SNDRV_MIXER_OSS_ITEM_CVOLUME))
		return 0;
	down_read(&mixer->card->controls_rwsem);
	if (ptr->index == 0 && (kctl = snd_mixer_oss_test_id(mixer, "Capture Source", 0)) != NULL) {
		snd_ctl_elem_info_t *uinfo;

		uinfo = kmalloc(sizeof(*uinfo), GFP_KERNEL);
		if (! uinfo) {
			up_read(&mixer->card->controls_rwsem);
			return -ENOMEM;
		}
			
		memset(uinfo, 0, sizeof(*uinfo));
		if (kctl->info(kctl, uinfo)) {
			up_read(&mixer->card->controls_rwsem);
			return 0;
		}
		strcpy(str, ptr->name);
		if (!strcmp(str, "Master"))
			strcpy(str, "Mix");
		if (!strcmp(str, "Master Mono"))
			strcpy(str, "Mix Mono");
		slot.capture_item = 0;
		if (!strcmp(uinfo->value.enumerated.name, str)) {
			slot.present |= SNDRV_MIXER_OSS_PRESENT_CAPTURE;
		} else {
			for (slot.capture_item = 1; slot.capture_item < uinfo->value.enumerated.items; slot.capture_item++) {
				uinfo->value.enumerated.item = slot.capture_item;
				if (kctl->info(kctl, uinfo)) {
					up_read(&mixer->card->controls_rwsem);
					return 0;
				}
				if (!strcmp(uinfo->value.enumerated.name, str)) {
					slot.present |= SNDRV_MIXER_OSS_PRESENT_CAPTURE;
					break;
				}
			}
		}
		kfree(uinfo);
	}
	up_read(&mixer->card->controls_rwsem);
	if (slot.present != 0) {
		pslot = (struct slot *)kmalloc(sizeof(slot), GFP_KERNEL);
		if (! pslot)
			return -ENOMEM;
		*pslot = slot;
		pslot->signature = SNDRV_MIXER_OSS_SIGNATURE;
		pslot->assigned = ptr;
		pslot->allocated = ptr_allocated;
		rslot = &mixer->slots[ptr->oss_id];
		mixer_slot_clear(rslot);
		rslot->stereo = slot.channels > 1 ? 1 : 0;
		rslot->get_volume = snd_mixer_oss_get_volume1;
		rslot->put_volume = snd_mixer_oss_put_volume1;
		/* note: ES18xx have both Capture Source and XX Capture Volume !!! */
		if (slot.present & SNDRV_MIXER_OSS_PRESENT_CSWITCH) {
			rslot->get_recsrc = snd_mixer_oss_get_recsrc1_sw;
			rslot->put_recsrc = snd_mixer_oss_put_recsrc1_sw;
		} else if (slot.present & SNDRV_MIXER_OSS_PRESENT_CROUTE) {
			rslot->get_recsrc = snd_mixer_oss_get_recsrc1_route;
			rslot->put_recsrc = snd_mixer_oss_put_recsrc1_route;
		} else if (slot.present & SNDRV_MIXER_OSS_PRESENT_CAPTURE) {
			mixer->mask_recsrc |= 1 << ptr->oss_id;
		}
		rslot->private_data = pslot;
		rslot->private_free = snd_mixer_oss_slot_free;
		return 1;
	}
	return 0;
}

/*
 */
#define MIXER_VOL(name) [SOUND_MIXER_##name] = #name
static char *oss_mixer_names[SNDRV_OSS_MAX_MIXERS] = {
	MIXER_VOL(VOLUME),
	MIXER_VOL(BASS),
	MIXER_VOL(TREBLE),
	MIXER_VOL(SYNTH),
	MIXER_VOL(PCM),
	MIXER_VOL(SPEAKER),
	MIXER_VOL(LINE),
	MIXER_VOL(MIC),
	MIXER_VOL(CD),
	MIXER_VOL(IMIX),
	MIXER_VOL(ALTPCM),
	MIXER_VOL(RECLEV),
	MIXER_VOL(IGAIN),
	MIXER_VOL(OGAIN),
	MIXER_VOL(LINE1),
	MIXER_VOL(LINE2),
	MIXER_VOL(LINE3),
	MIXER_VOL(DIGITAL1),
	MIXER_VOL(DIGITAL2),
	MIXER_VOL(DIGITAL3),
	MIXER_VOL(PHONEIN),
	MIXER_VOL(PHONEOUT),
	MIXER_VOL(VIDEO),
	MIXER_VOL(RADIO),
	MIXER_VOL(MONITOR),
};
	
/*
 *  /proc interface
 */

static void snd_mixer_oss_proc_read(snd_info_entry_t *entry,
				    snd_info_buffer_t * buffer)
{
	snd_mixer_oss_t *mixer = entry->private_data;
	int i;

	down(&mixer->reg_mutex);
	for (i = 0; i < SNDRV_OSS_MAX_MIXERS; i++) {
		struct slot *p;

		if (! oss_mixer_names[i])
			continue;
		p = (struct slot *)mixer->slots[i].private_data;
		snd_iprintf(buffer, "%s ", oss_mixer_names[i]);
		if (p && p->assigned)
			snd_iprintf(buffer, "\"%s\" %d\n",
				    p->assigned->name,
				    p->assigned->index);
		else
			snd_iprintf(buffer, "\"\" 0\n");
	}
	up(&mixer->reg_mutex);
}

static void snd_mixer_oss_proc_write(snd_info_entry_t *entry,
				     snd_info_buffer_t * buffer)
{
	snd_mixer_oss_t *mixer = entry->private_data;
	char line[128], str[32], idxstr[16], *cptr;
	int ch, idx;
	struct snd_mixer_oss_assign_table *tbl;
	struct slot *slot;

	while (!snd_info_get_line(buffer, line, sizeof(line))) {
		cptr = snd_info_get_str(str, line, sizeof(str));
		for (ch = 0; ch < SNDRV_OSS_MAX_MIXERS; ch++)
			if (oss_mixer_names[ch] && strcmp(oss_mixer_names[ch], str) == 0)
				break;
		if (ch >= SNDRV_OSS_MAX_MIXERS) {
			snd_printk(KERN_ERR "mixer_oss: invalid OSS volume '%s'\n", str);
			continue;
		}
		cptr = snd_info_get_str(str, cptr, sizeof(str));
		if (! *str) {
			/* remove the entry */
			down(&mixer->reg_mutex);
			mixer_slot_clear(&mixer->slots[ch]);
			up(&mixer->reg_mutex);
			continue;
		}
		snd_info_get_str(idxstr, cptr, sizeof(idxstr));
		idx = simple_strtoul(idxstr, NULL, 10);
		if (idx >= 0x4000) { /* too big */
			snd_printk(KERN_ERR "mixer_oss: invalid index %d\n", idx);
			continue;
		}
		down(&mixer->reg_mutex);
		slot = (struct slot *)mixer->slots[ch].private_data;
		if (slot && slot->assigned &&
		    slot->assigned->index == idx && ! strcmp(slot->assigned->name, str))
			/* not changed */
			goto __unlock;
		tbl = kmalloc(sizeof(*tbl), GFP_KERNEL);
		if (! tbl) {
			snd_printk(KERN_ERR "mixer_oss: no memory\n");
			goto __unlock;
		}
		tbl->oss_id = ch;
		tbl->name = kstrdup(str, GFP_KERNEL);
		if (! tbl->name) {
			kfree(tbl);
			goto __unlock;
		}
		tbl->index = idx;
		if (snd_mixer_oss_build_input(mixer, tbl, 1, 1) <= 0) {
			kfree(tbl->name);
			kfree(tbl);
		}
	__unlock:
		up(&mixer->reg_mutex);
	}
}

static void snd_mixer_oss_proc_init(snd_mixer_oss_t *mixer)
{
	snd_info_entry_t *entry;

	entry = snd_info_create_card_entry(mixer->card, "oss_mixer",
					   mixer->card->proc_root);
	if (! entry)
		return;
	entry->content = SNDRV_INFO_CONTENT_TEXT;
	entry->mode = S_IFREG | S_IRUGO | S_IWUSR;
	entry->c.text.read_size = 8192;
	entry->c.text.read = snd_mixer_oss_proc_read;
	entry->c.text.write_size = 8192;
	entry->c.text.write = snd_mixer_oss_proc_write;
	entry->private_data = mixer;
	if (snd_info_register(entry) < 0) {
		snd_info_free_entry(entry);
		entry = NULL;
	}
	mixer->proc_entry = entry;
}

static void snd_mixer_oss_proc_done(snd_mixer_oss_t *mixer)
{
	if (mixer->proc_entry) {
		snd_info_unregister(mixer->proc_entry);
		mixer->proc_entry = NULL;
	}
}

static void snd_mixer_oss_build(snd_mixer_oss_t *mixer)
{
	static struct snd_mixer_oss_assign_table table[] = {
		{ SOUND_MIXER_VOLUME, 	"Master",		0 },
		{ SOUND_MIXER_VOLUME, 	"Front",		0 }, /* fallback */
		{ SOUND_MIXER_BASS,	"Tone Control - Bass",	0 },
		{ SOUND_MIXER_TREBLE,	"Tone Control - Treble", 0 },
		{ SOUND_MIXER_SYNTH,	"Synth",		0 },
		{ SOUND_MIXER_SYNTH,	"FM",			0 }, /* fallback */
		{ SOUND_MIXER_SYNTH,	"Music",		0 }, /* fallback */
		{ SOUND_MIXER_PCM,	"PCM",			0 },
		{ SOUND_MIXER_SPEAKER,	"PC Speaker", 		0 },
		{ SOUND_MIXER_LINE,	"Line", 		0 },
		{ SOUND_MIXER_MIC,	"Mic", 			0 },
		{ SOUND_MIXER_CD,	"CD", 			0 },
		{ SOUND_MIXER_IMIX,	"Monitor Mix", 		0 },
		{ SOUND_MIXER_ALTPCM,	"PCM",			1 },
		{ SOUND_MIXER_ALTPCM,	"Headphone",		0 }, /* fallback */
		{ SOUND_MIXER_ALTPCM,	"Wave",			0 }, /* fallback */
		{ SOUND_MIXER_RECLEV,	"-- nothing --",	0 },
		{ SOUND_MIXER_IGAIN,	"Capture",		0 },
		{ SOUND_MIXER_OGAIN,	"Playback",		0 },
		{ SOUND_MIXER_LINE1,	"Aux",			0 },
		{ SOUND_MIXER_LINE2,	"Aux",			1 },
		{ SOUND_MIXER_LINE3,	"Aux",			2 },
		{ SOUND_MIXER_DIGITAL1,	"Digital",		0 },
		{ SOUND_MIXER_DIGITAL1,	"IEC958",		0 }, /* fallback */
		{ SOUND_MIXER_DIGITAL1,	"IEC958 Optical",	0 }, /* fallback */
		{ SOUND_MIXER_DIGITAL1,	"IEC958 Coaxial",	0 }, /* fallback */
		{ SOUND_MIXER_DIGITAL2,	"Digital",		1 },
		{ SOUND_MIXER_DIGITAL3,	"Digital",		2 },
		{ SOUND_MIXER_PHONEIN,	"Phone",		0 },
		{ SOUND_MIXER_PHONEOUT,	"Master Mono",		0 },
		{ SOUND_MIXER_PHONEOUT,	"Phone",		0 }, /* fallback */
		{ SOUND_MIXER_VIDEO,	"Video",		0 },
		{ SOUND_MIXER_RADIO,	"Radio",		0 },
		{ SOUND_MIXER_MONITOR,	"Monitor",		0 }
	};
	unsigned int idx;
	
	for (idx = 0; idx < ARRAY_SIZE(table); idx++)
		snd_mixer_oss_build_input(mixer, &table[idx], 0, 0);
	if (mixer->mask_recsrc) {
		mixer->get_recsrc = snd_mixer_oss_get_recsrc2;
		mixer->put_recsrc = snd_mixer_oss_put_recsrc2;
	}
}

/*
 *
 */

static int snd_mixer_oss_free1(void *private)
{
	snd_mixer_oss_t *mixer = private;
	snd_card_t * card;
	int idx;
 
	snd_assert(mixer != NULL, return -ENXIO);
	card = mixer->card;
	snd_assert(mixer == card->mixer_oss, return -ENXIO);
	card->mixer_oss = NULL;
	for (idx = 0; idx < SNDRV_OSS_MAX_MIXERS; idx++) {
		snd_mixer_oss_slot_t *chn = &mixer->slots[idx];
		if (chn->private_free)
			chn->private_free(chn);
	}
	kfree(mixer);
	return 0;
}

static int snd_mixer_oss_notify_handler(snd_card_t * card, int cmd)
{
	snd_mixer_oss_t *mixer;

	if (cmd == SND_MIXER_OSS_NOTIFY_REGISTER) {
		char name[128];
		int idx, err;

		mixer = kcalloc(2, sizeof(*mixer), GFP_KERNEL);
		if (mixer == NULL)
			return -ENOMEM;
		init_MUTEX(&mixer->reg_mutex);
		sprintf(name, "mixer%i%i", card->number, 0);
		if ((err = snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIXER,
						   card, 0,
						   &snd_mixer_oss_reg,
						   name)) < 0) {
			snd_printk(KERN_ERR "unable to register OSS mixer device %i:%i\n",
				   card->number, 0);
			kfree(mixer);
			return err;
		}
		mixer->oss_dev_alloc = 1;
		mixer->card = card;
		if (*card->mixername)
			strlcpy(mixer->name, card->mixername, sizeof(mixer->name));
		else
			strlcpy(mixer->name, name, sizeof(mixer->name));
#ifdef SNDRV_OSS_INFO_DEV_MIXERS
		snd_oss_info_register(SNDRV_OSS_INFO_DEV_MIXERS,
				      card->number,
				      mixer->name);
#endif
		for (idx = 0; idx < SNDRV_OSS_MAX_MIXERS; idx++)
			mixer->slots[idx].number = idx;
		card->mixer_oss = mixer;
		snd_mixer_oss_build(mixer);
		snd_mixer_oss_proc_init(mixer);
	} else if (cmd == SND_MIXER_OSS_NOTIFY_DISCONNECT) {
		mixer = card->mixer_oss;
		if (mixer == NULL || !mixer->oss_dev_alloc)
			return 0;
		snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MIXER, mixer->card, 0);
		mixer->oss_dev_alloc = 0;
	} else {		/* free */
		mixer = card->mixer_oss;
		if (mixer == NULL)
			return 0;
#ifdef SNDRV_OSS_INFO_DEV_MIXERS
		snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_MIXERS, mixer->card->number);
#endif
		if (mixer->oss_dev_alloc)
			snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MIXER, mixer->card, 0);
		snd_mixer_oss_proc_done(mixer);
		return snd_mixer_oss_free1(mixer);
	}
	return 0;
}

static int __init alsa_mixer_oss_init(void)
{
	int idx;
	
	snd_mixer_oss_notify_callback = snd_mixer_oss_notify_handler;
	for (idx = 0; idx < SNDRV_CARDS; idx++) {
		if (snd_cards[idx])
			snd_mixer_oss_notify_handler(snd_cards[idx], SND_MIXER_OSS_NOTIFY_REGISTER);
	}
	return 0;
}

static void __exit alsa_mixer_oss_exit(void)
{
	int idx;

	snd_mixer_oss_notify_callback = NULL;
	for (idx = 0; idx < SNDRV_CARDS; idx++) {
		if (snd_cards[idx])
			snd_mixer_oss_notify_handler(snd_cards[idx], SND_MIXER_OSS_NOTIFY_FREE);
	}
}

module_init(alsa_mixer_oss_init)
module_exit(alsa_mixer_oss_exit)

EXPORT_SYMBOL(snd_mixer_oss_ioctl_card);