mixer_oss.c

是关于linux2.5.1的完全源码

		return put_user(tmp, (int *)arg) ? -EFAULT : 0;
	} else if (cmd & IOC_OUT) {
		tmp = snd_mixer_oss_get_volume(fmixer, cmd & 0xff);
		if (tmp < 0)
			return tmp;
		return put_user(tmp, (int *)arg) ? -EFAULT : 0;
	}
	return -ENXIO;
}

int snd_mixer_oss_ioctl(struct inode *inode, struct file *file,
			unsigned int cmd, unsigned long arg)
{
	return snd_mixer_oss_ioctl1((snd_mixer_oss_file_t *) file->private_data, cmd, arg);
}

int snd_mixer_oss_ioctl_card(snd_card_t *card, unsigned int cmd, unsigned long arg)
{
	snd_mixer_oss_file_t fmixer;
	
	snd_assert(card != NULL, return -ENXIO);
	if (card->mixer_oss == NULL)
		return -ENXIO;
	memset(&fmixer, 0, sizeof(fmixer));
	fmixer.card = card;
	fmixer.mixer = card->mixer_oss;
	return snd_mixer_oss_ioctl1(&fmixer, cmd, arg);
}

/*
 *  REGISTRATION PART
 */

static struct file_operations snd_mixer_oss_f_ops =
{
#ifndef LINUX_2_2
	owner:		THIS_MODULE,
#endif
	open:		snd_mixer_oss_open,
	release:	snd_mixer_oss_release,
	ioctl:		snd_mixer_oss_ioctl,
};

static snd_minor_t snd_mixer_oss_reg =
{
	comment:	"mixer",
	f_ops:		&snd_mixer_oss_f_ops,
};

/*
 *  utilities
 */

static long snd_mixer_oss_conv(long val, long omin, long omax, long nmin, long nmax)
{
	long orange = omax - omin, nrange = nmax - nmin;
	
	if (orange == 0)
		return 0;
	return ((nrange * (val - omin)) + (orange / 2)) / orange + nmin;
}

static long snd_mixer_oss_conv1(long val, long min, long max, int *old)
{
	if (val == snd_mixer_oss_conv(*old, 0, 100, min, max))
		return *old;
	return snd_mixer_oss_conv(val, min, max, 0, 100);
}

static long snd_mixer_oss_conv2(long val, long min, long max)
{
	return snd_mixer_oss_conv(val, 0, 100, min, max);
}

#if 0
static void snd_mixer_oss_recsrce_set(snd_card_t *card, int slot)
{
	snd_mixer_oss_t *mixer = card->mixer_oss;
	if (mixer)
		mixer->mask_recsrc |= 1 << slot;
}

static int snd_mixer_oss_recsrce_get(snd_card_t *card, int slot)
{
	snd_mixer_oss_t *mixer = card->mixer_oss;
	if (mixer && (mixer->mask_recsrc & (1 << slot)))
		return 1;
	return 0;
}
#endif

#define SNDRV_MIXER_OSS_SIGNATURE		0x65999250

#define SNDRV_MIXER_OSS_ITEM_GLOBAL	0
#define SNDRV_MIXER_OSS_ITEM_GSWITCH	1
#define SNDRV_MIXER_OSS_ITEM_GROUTE	2
#define SNDRV_MIXER_OSS_ITEM_GVOLUME	3
#define SNDRV_MIXER_OSS_ITEM_PSWITCH	4
#define SNDRV_MIXER_OSS_ITEM_PROUTE	5
#define SNDRV_MIXER_OSS_ITEM_PVOLUME	6
#define SNDRV_MIXER_OSS_ITEM_CSWITCH	7
#define SNDRV_MIXER_OSS_ITEM_CROUTE	8
#define SNDRV_MIXER_OSS_ITEM_CVOLUME	9
#define SNDRV_MIXER_OSS_ITEM_CAPTURE	10

#define SNDRV_MIXER_OSS_ITEM_COUNT	11

#define SNDRV_MIXER_OSS_PRESENT_GLOBAL	(1<<0)
#define SNDRV_MIXER_OSS_PRESENT_GSWITCH	(1<<1)
#define SNDRV_MIXER_OSS_PRESENT_GROUTE	(1<<2)
#define SNDRV_MIXER_OSS_PRESENT_GVOLUME	(1<<3)
#define SNDRV_MIXER_OSS_PRESENT_PSWITCH	(1<<4)
#define SNDRV_MIXER_OSS_PRESENT_PROUTE	(1<<5)
#define SNDRV_MIXER_OSS_PRESENT_PVOLUME	(1<<6)
#define SNDRV_MIXER_OSS_PRESENT_CSWITCH	(1<<7)
#define SNDRV_MIXER_OSS_PRESENT_CROUTE	(1<<8)
#define SNDRV_MIXER_OSS_PRESENT_CVOLUME	(1<<9)
#define SNDRV_MIXER_OSS_PRESENT_CAPTURE	(1<<10)

struct slot {
	unsigned int signature;
	unsigned int present;
	int channels;
	snd_kcontrol_t *kcontrol[SNDRV_MIXER_OSS_ITEM_COUNT];
	unsigned int capture_item;
};

static snd_kcontrol_t *snd_mixer_oss_test_id(snd_mixer_oss_t *mixer, const char *name, int index)
{
	snd_card_t * card = mixer->card;
	snd_ctl_elem_id_t id;
	
	memset(&id, 0, sizeof(id));
	id.iface = SNDRV_CTL_ELEM_IFACE_MIXER;
	strcpy(id.name, name);
	id.index = index;
	return snd_ctl_find_id(card, &id);
}

static void snd_mixer_oss_get_volume1_vol(snd_mixer_oss_file_t *fmixer,
					  snd_mixer_oss_slot_t *pslot,
					  snd_kcontrol_t *kctl,
					  int *left, int *right)
{
	snd_ctl_elem_info_t uinfo;
	snd_ctl_elem_value_t uctl;

	snd_runtime_check(kctl != NULL, return);
	memset(&uinfo, 0, sizeof(uinfo));
	memset(&uctl, 0, sizeof(uctl));
	snd_runtime_check(!kctl->info(kctl, &uinfo), return);
	snd_runtime_check(!kctl->get(kctl, &uctl), return);
	snd_runtime_check(uinfo.type != SNDRV_CTL_ELEM_TYPE_BOOLEAN || uinfo.value.integer.min != 0 || uinfo.value.integer.max != 1, return);
	*left = snd_mixer_oss_conv1(uctl.value.integer.value[0], uinfo.value.integer.min, uinfo.value.integer.max, &fmixer->volume[pslot->number][0]);
	if (uinfo.count > 1)
		*right = snd_mixer_oss_conv1(uctl.value.integer.value[1], uinfo.value.integer.min, uinfo.value.integer.max, &fmixer->volume[pslot->number][1]);
}

static void snd_mixer_oss_get_volume1_sw(snd_mixer_oss_file_t *fmixer,
					 snd_mixer_oss_slot_t *pslot,
					 snd_kcontrol_t *kctl,
					 int *left, int *right,
					 int route)
{
	snd_ctl_elem_info_t uinfo;
	snd_ctl_elem_value_t uctl;

	snd_runtime_check(kctl != NULL, return);
	memset(&uinfo, 0, sizeof(uinfo));
	memset(&uctl, 0, sizeof(uctl));
	snd_runtime_check(!kctl->info(kctl, &uinfo), return);
	snd_runtime_check(!kctl->get(kctl, &uctl), return);
	if (!uctl.value.integer.value[0]) {
		*left = 0;
		if (uinfo.count == 1)
			*right = 0;
	}
	if (uinfo.count > 1 && !uctl.value.integer.value[route ? 3 : 1])
		*right = 0;
}

static int snd_mixer_oss_get_volume1(snd_mixer_oss_file_t *fmixer,
				     snd_mixer_oss_slot_t *pslot,
				     int *left, int *right)
{
	snd_card_t *card = fmixer->card;
	struct slot *slot = (struct slot *)pslot->private_data;
	
	*left = *right = 100;
	read_lock(&card->control_rwlock);
	if (slot->present & SNDRV_MIXER_OSS_PRESENT_PVOLUME) {
		snd_mixer_oss_get_volume1_vol(fmixer, pslot, slot->kcontrol[SNDRV_MIXER_OSS_ITEM_PVOLUME], left, right);
	} else if (slot->present & SNDRV_MIXER_OSS_PRESENT_GVOLUME) {
		snd_mixer_oss_get_volume1_vol(fmixer, pslot, slot->kcontrol[SNDRV_MIXER_OSS_ITEM_GVOLUME], left, right);
	} else if (slot->present & SNDRV_MIXER_OSS_PRESENT_GLOBAL) {
		snd_mixer_oss_get_volume1_vol(fmixer, pslot, slot->kcontrol[SNDRV_MIXER_OSS_ITEM_GLOBAL], left, right);
	}
	if (slot->present & SNDRV_MIXER_OSS_PRESENT_PSWITCH) {
		snd_mixer_oss_get_volume1_sw(fmixer, pslot, slot->kcontrol[SNDRV_MIXER_OSS_ITEM_PSWITCH], left, right, 0);
	} else if (slot->present & SNDRV_MIXER_OSS_PRESENT_GSWITCH) {
		snd_mixer_oss_get_volume1_sw(fmixer, pslot, slot->kcontrol[SNDRV_MIXER_OSS_ITEM_GSWITCH], left, right, 0);
	} else if (slot->present & SNDRV_MIXER_OSS_PRESENT_PROUTE) {
		snd_mixer_oss_get_volume1_sw(fmixer, pslot, slot->kcontrol[SNDRV_MIXER_OSS_ITEM_PROUTE], left, right, 1);
	} else if (slot->present & SNDRV_MIXER_OSS_PRESENT_GROUTE) {
		snd_mixer_oss_get_volume1_sw(fmixer, pslot, slot->kcontrol[SNDRV_MIXER_OSS_ITEM_GROUTE], left, right, 1);
	}
	read_unlock(&card->control_rwlock);
	return 0;
}

static void snd_mixer_oss_put_volume1_vol(snd_mixer_oss_file_t *fmixer,
					  snd_mixer_oss_slot_t *pslot,
					  snd_kcontrol_t *kctl,
					  int left, int right)
{
	snd_ctl_elem_info_t uinfo;
	snd_ctl_elem_value_t uctl;
	int res;

	snd_runtime_check(kctl != NULL, return);
	memset(&uinfo, 0, sizeof(uinfo));
	memset(&uctl, 0, sizeof(uctl));
	snd_runtime_check(!kctl->info(kctl, &uinfo), return);
	snd_runtime_check(uinfo.type != SNDRV_CTL_ELEM_TYPE_BOOLEAN || uinfo.value.integer.min != 0 || uinfo.value.integer.max != 1, return);
	uctl.value.integer.value[0] = snd_mixer_oss_conv2(left, uinfo.value.integer.min, uinfo.value.integer.max);
	if (uinfo.count > 1)
		uctl.value.integer.value[1] = snd_mixer_oss_conv2(right, uinfo.value.integer.min, uinfo.value.integer.max);
	snd_runtime_check((res = kctl->put(kctl, &uctl)) >= 0, return);
	if (res > 0)
		snd_ctl_notify(fmixer->card, SNDRV_CTL_EVENT_MASK_VALUE, &kctl->id);
}

static void snd_mixer_oss_put_volume1_sw(snd_mixer_oss_file_t *fmixer,
					 snd_mixer_oss_slot_t *pslot,
					 snd_kcontrol_t *kctl,
					 int left, int right,
					 int route)
{
	snd_ctl_elem_info_t uinfo;
	snd_ctl_elem_value_t uctl;
	int res;

	snd_runtime_check(kctl != NULL, return);
	memset(&uinfo, 0, sizeof(uinfo));
	memset(&uctl, 0, sizeof(uctl));
	snd_runtime_check(!kctl->info(kctl, &uinfo), return);
	if (uinfo.count > 1) {
		uctl.value.integer.value[0] = left > 0 ? 1 : 0;
		uctl.value.integer.value[route ? 3 : 1] = right > 0 ? 1 : 0;
		if (route) {
			uctl.value.integer.value[1] =
			uctl.value.integer.value[2] = 0;
		}
	} else {
		uctl.value.integer.value[0] = (left > 0 || right > 0) ? 1 : 0;
	}
	snd_runtime_check((res = kctl->put(kctl, &uctl)) >= 0, return);
	if (res > 0)
		snd_ctl_notify(fmixer->card, SNDRV_CTL_EVENT_MASK_VALUE, &kctl->id);
}

static int snd_mixer_oss_put_volume1(snd_mixer_oss_file_t *fmixer,
				     snd_mixer_oss_slot_t *pslot,
				     int left, int right)
{
	snd_card_t *card = fmixer->card;
	struct slot *slot = (struct slot *)pslot->private_data;
	
	read_lock(&card->control_rwlock);
	if (slot->present & SNDRV_MIXER_OSS_PRESENT_PVOLUME) {
		snd_mixer_oss_put_volume1_vol(fmixer, pslot, slot->kcontrol[SNDRV_MIXER_OSS_ITEM_PVOLUME], left, right);
		if (slot->present & SNDRV_MIXER_OSS_PRESENT_CVOLUME)
			snd_mixer_oss_put_volume1_vol(fmixer, pslot, slot->kcontrol[SNDRV_MIXER_OSS_ITEM_CVOLUME], left, right);
	} else if (slot->present & SNDRV_MIXER_OSS_PRESENT_GVOLUME) {
		snd_mixer_oss_put_volume1_vol(fmixer, pslot, slot->kcontrol[SNDRV_MIXER_OSS_ITEM_GVOLUME], left, right);
	} else if (slot->present & SNDRV_MIXER_OSS_PRESENT_GLOBAL) {
		snd_mixer_oss_put_volume1_vol(fmixer, pslot, slot->kcontrol[SNDRV_MIXER_OSS_ITEM_GLOBAL], left, right);
	}
	if (left || right) {
		if (slot->present & SNDRV_MIXER_OSS_PRESENT_PSWITCH)
			snd_mixer_oss_put_volume1_sw(fmixer, pslot, slot->kcontrol[SNDRV_MIXER_OSS_ITEM_PSWITCH], left, right, 0);
		if (slot->present & SNDRV_MIXER_OSS_PRESENT_GSWITCH)
			snd_mixer_oss_put_volume1_sw(fmixer, pslot, slot->kcontrol[SNDRV_MIXER_OSS_ITEM_GSWITCH], left, right, 0);
		if (slot->present & SNDRV_MIXER_OSS_PRESENT_PROUTE)
			snd_mixer_oss_put_volume1_sw(fmixer, pslot, slot->kcontrol[SNDRV_MIXER_OSS_ITEM_PROUTE], left, right, 1);
		if (slot->present & SNDRV_MIXER_OSS_PRESENT_GROUTE)
			snd_mixer_oss_put_volume1_sw(fmixer, pslot, slot->kcontrol[SNDRV_MIXER_OSS_ITEM_GROUTE], left, right, 1);
	} else {
		if (slot->present & SNDRV_MIXER_OSS_PRESENT_PSWITCH) {
			snd_mixer_oss_put_volume1_sw(fmixer, pslot, slot->kcontrol[SNDRV_MIXER_OSS_ITEM_PSWITCH], left, right, 0);
		} else if (slot->present & SNDRV_MIXER_OSS_PRESENT_GSWITCH) {
			snd_mixer_oss_put_volume1_sw(fmixer, pslot, slot->kcontrol[SNDRV_MIXER_OSS_ITEM_GSWITCH], left, right, 0);
		} else if (slot->present & SNDRV_MIXER_OSS_PRESENT_PROUTE) {
			snd_mixer_oss_put_volume1_sw(fmixer, pslot, slot->kcontrol[SNDRV_MIXER_OSS_ITEM_PROUTE], left, right, 1);
		} else if (slot->present & SNDRV_MIXER_OSS_PRESENT_GROUTE) {
			snd_mixer_oss_put_volume1_sw(fmixer, pslot, slot->kcontrol[SNDRV_MIXER_OSS_ITEM_GROUTE], left, right, 1);
		}
	}
	read_unlock(&card->control_rwlock);
	return 0;
}

static int snd_mixer_oss_get_recsrc1_sw(snd_mixer_oss_file_t *fmixer,
					snd_mixer_oss_slot_t *pslot,
					int *active)
{
	snd_card_t *card = fmixer->card;
	struct slot *slot = (struct slot *)pslot->private_data;
	int left, right;
	
	left = right = 1;
	read_lock(&card->control_rwlock);
	snd_mixer_oss_get_volume1_sw(fmixer, pslot, slot->kcontrol[SNDRV_MIXER_OSS_ITEM_CSWITCH], &left, &right, 0);
	read_unlock(&card->control_rwlock);
	*active = (left || right) ? 1 : 0;
	return 0;
}

static int snd_mixer_oss_get_recsrc1_route(snd_mixer_oss_file_t *fmixer,
					   snd_mixer_oss_slot_t *pslot,
					   int *active)
{
	snd_card_t *card = fmixer->card;
	struct slot *slot = (struct slot *)pslot->private_data;
	int left, right;
	
	left = right = 1;
	read_lock(&card->control_rwlock);
	snd_mixer_oss_get_volume1_sw(fmixer, pslot, slot->kcontrol[SNDRV_MIXER_OSS_ITEM_CROUTE], &left, &right, 1);
	read_unlock(&card->control_rwlock);
	*active = (left || right) ? 1 : 0;
	return 0;
}

static int snd_mixer_oss_put_recsrc1_sw(snd_mixer_oss_file_t *fmixer,
					snd_mixer_oss_slot_t *pslot,
					int active)
{
	snd_card_t *card = fmixer->card;
	struct slot *slot = (struct slot *)pslot->private_data;
	
	read_lock(&card->control_rwlock);
	snd_mixer_oss_put_volume1_sw(fmixer, pslot, slot->kcontrol[SNDRV_MIXER_OSS_ITEM_CSWITCH], active, active, 0);
	read_unlock(&card->control_rwlock);
	return 0;
}

static int snd_mixer_oss_put_recsrc1_route(snd_mixer_oss_file_t *fmixer,
					   snd_mixer_oss_slot_t *pslot,