state.c

alsa-utils-1.0.14编译声卡驱动所需要的一些文件源码

			return -EINVAL;
		}
	}

	err = snd_config_compound_add(control, "value", 1, &value);
	if (err < 0) {
		error("snd_config_compound_add: %s", snd_strerror(err));
		return err;
	}

	switch (type) {
	case SND_CTL_ELEM_TYPE_BOOLEAN:
		for (idx = 0; idx < count; idx++) {
			err = snd_config_string_add(value, num_str(idx), snd_ctl_elem_value_get_boolean(ctl, idx) ? "true" : "false");
			if (err < 0) {
				error("snd_config_string_add: %s", snd_strerror(err));
				return err;
			}
		}
		break;
	case SND_CTL_ELEM_TYPE_INTEGER:
		for (idx = 0; idx < count; idx++) {
			err = snd_config_integer_add(value, num_str(idx), snd_ctl_elem_value_get_integer(ctl, idx));
			if (err < 0) {
				error("snd_config_integer_add: %s", snd_strerror(err));
				return err;
			}
		}
		break;
	case SND_CTL_ELEM_TYPE_INTEGER64:
		for (idx = 0; idx < count; idx++) {
			err = snd_config_integer64_add(value, num_str(idx), snd_ctl_elem_value_get_integer64(ctl, idx));
			if (err < 0) {
				error("snd_config_integer64_add: %s", snd_strerror(err));
				return err;
			}
		}
		break;
	case SND_CTL_ELEM_TYPE_ENUMERATED:
		for (idx = 0; idx < count; idx++) {
			unsigned int v = snd_ctl_elem_value_get_enumerated(ctl, idx);
			snd_config_t *c;
			err = snd_config_search(item, num_str(v), &c);
			if (err == 0) {
				err = snd_config_get_string(c, &s);
				assert(err == 0);
				err = snd_config_string_add(value, num_str(idx), s);
			} else {
				err = snd_config_integer_add(value, num_str(idx), v);
			}
			if (err < 0) {
				error("snd_config add: %s", snd_strerror(err));
				return err;
			}
		}
		break;
	default:
		error("Unknown control type: %d\n", type);
		return -EINVAL;
	}
	
	return 0;
}
	
static int get_controls(int cardno, snd_config_t *top)
{
	snd_ctl_t *handle;
	snd_ctl_card_info_t *info;
	snd_config_t *state, *card, *control;
	snd_ctl_elem_list_t *list;
	unsigned int idx;
	int err;
	char name[32];
	unsigned int count;
	const char *id;
	snd_ctl_card_info_alloca(&info);
	snd_ctl_elem_list_alloca(&list);

	sprintf(name, "hw:%d", cardno);
	err = snd_ctl_open(&handle, name, SND_CTL_READONLY);
	if (err < 0) {
		error("snd_ctl_open error: %s", snd_strerror(err));
		return err;
	}
	err = snd_ctl_card_info(handle, info);
	if (err < 0) {
		error("snd_ctl_card_info error: %s", snd_strerror(err));
		goto _close;
	}
	id = snd_ctl_card_info_get_id(info);
	err = snd_config_search(top, "state", &state);
	if (err == 0 &&
	    snd_config_get_type(state) != SND_CONFIG_TYPE_COMPOUND) {
		error("config state node is not a compound");
		err = -EINVAL;
		goto _close;
	}
	if (err < 0) {
		err = snd_config_compound_add(top, "state", 1, &state);
		if (err < 0) {
			error("snd_config_compound_add: %s", snd_strerror(err));
			goto _close;
		}
	}
	err = snd_config_search(state, id, &card);
	if (err == 0 &&
	    snd_config_get_type(card) != SND_CONFIG_TYPE_COMPOUND) {
		error("config state.%s node is not a compound", id);
		err = -EINVAL;
		goto _close;
	}
	if (err < 0) {
		err = snd_config_compound_add(state, id, 0, &card);
		if (err < 0) {
			error("snd_config_compound_add: %s", snd_strerror(err));
			goto _close;
		}
	}
	err = snd_config_search(card, "control", &control);
	if (err == 0) {
		err = snd_config_delete(control);
		if (err < 0) {
			error("snd_config_delete: %s", snd_strerror(err));
			goto _close;
		}
	}
	err = snd_ctl_elem_list(handle, list);
	if (err < 0) {
		error("Cannot determine controls: %s", snd_strerror(err));
		goto _close;
	}
	count = snd_ctl_elem_list_get_count(list);
	if (count < 0) {
		err = 0;
		goto _close;
	}
	err = snd_config_compound_add(card, "control", count > 0, &control);
	if (err < 0) {
		error("snd_config_compound_add: %s", snd_strerror(err));
		goto _close;
	}
	if (count == 0) {
		err = 0;
		goto _close;
	}
	snd_ctl_elem_list_set_offset(list, 0);
	if (snd_ctl_elem_list_alloc_space(list, count) < 0) {
		error("No enough memory...");
		goto _close;
	}
	if ((err = snd_ctl_elem_list(handle, list)) < 0) {
		error("Cannot determine controls (2): %s", snd_strerror(err));
		goto _free;
	}
	for (idx = 0; idx < count; ++idx) {
		snd_ctl_elem_id_t *id;
		snd_ctl_elem_id_alloca(&id);
		snd_ctl_elem_list_get_id(list, idx, id);
		err = get_control(handle, id, control);
		if (err < 0)
			goto _free;
	}		
		
	err = 0;
 _free:
	snd_ctl_elem_list_free_space(list);
 _close:
	snd_ctl_close(handle);
	return err;
}

static long config_iface(snd_config_t *n)
{
	long i;
	long long li;
	snd_ctl_elem_iface_t idx; 
	const char *str;
	switch (snd_config_get_type(n)) {
	case SND_CONFIG_TYPE_INTEGER:
		snd_config_get_integer(n, &i);
		return i;
	case SND_CONFIG_TYPE_INTEGER64:
		snd_config_get_integer64(n, &li);
		return li;
	case SND_CONFIG_TYPE_STRING:
		snd_config_get_string(n, &str);
		break;
	default:
		return -1;
	}
	for (idx = 0; idx <= SND_CTL_ELEM_IFACE_LAST; idx++) {
		if (strcasecmp(snd_ctl_elem_iface_name(idx), str) == 0)
			return idx;
	}
	return -1;
}

static int config_bool(snd_config_t *n)
{
	const char *str;
	long val;
	long long lval;
	switch (snd_config_get_type(n)) {
	case SND_CONFIG_TYPE_INTEGER:
		snd_config_get_integer(n, &val);
		if (val < 0 || val > 1)
			return -1;
		return val;
	case SND_CONFIG_TYPE_INTEGER64:
		snd_config_get_integer64(n, &lval);
		if (lval < 0 || lval > 1)
			return -1;
		return (int) lval;
	case SND_CONFIG_TYPE_STRING:
		snd_config_get_string(n, &str);
		break;
	default:
		return -1;
	}
	if (strcmp(str, "on") == 0 || strcmp(str, "true") == 0)
		return 1;
	if (strcmp(str, "off") == 0 || strcmp(str, "false") == 0)
		return 0;
	return -1;
}

static int config_enumerated(snd_config_t *n, snd_ctl_t *handle,
			     snd_ctl_elem_info_t *info)
{
	const char *str;
	long val;
	long long lval;
	unsigned int idx, items;
	switch (snd_config_get_type(n)) {
	case SND_CONFIG_TYPE_INTEGER:
		snd_config_get_integer(n, &val);
		return val;
	case SND_CONFIG_TYPE_INTEGER64:
		snd_config_get_integer64(n, &lval);
		return (int) lval;
	case SND_CONFIG_TYPE_STRING:
		snd_config_get_string(n, &str);
		break;
	default:
		return -1;
	}
	items = snd_ctl_elem_info_get_items(info);
	for (idx = 0; idx < items; idx++) {
		int err;
		snd_ctl_elem_info_set_item(info, idx);
		err = snd_ctl_elem_info(handle, info);
		if (err < 0) {
			error("snd_ctl_elem_info: %s", snd_strerror(err));
			return err;
		}
		if (strcmp(str, snd_ctl_elem_info_get_item_name(info)) == 0)
			return idx;
	}
	return -1;
}

static int is_user_control(snd_config_t *conf)
{
	snd_config_iterator_t i, next;

	snd_config_for_each(i, next, conf) {
		snd_config_t *n = snd_config_iterator_entry(i);
		const char *id, *s;
		if (snd_config_get_id(n, &id) < 0)
			continue;
		if (strcmp(id, "access") == 0) {
			if (snd_config_get_string(n, &s) < 0)
				return 0;
			if (strstr(s, "user"))
				return 1;
		}
	}
	return 0;
}

static int add_user_control(snd_ctl_t *handle, snd_ctl_elem_info_t *info, snd_config_t *conf)
{
	snd_ctl_elem_id_t *id;
	snd_config_iterator_t i, next;
	long imin, imax, istep;
	snd_ctl_elem_type_t ctype;
	unsigned int count;
	int err;
	unsigned int *tlv;

	imin = imax = istep = 0;
	count = 0;
	ctype = SND_CTL_ELEM_TYPE_NONE;
	tlv = NULL;
	snd_config_for_each(i, next, conf) {
		snd_config_t *n = snd_config_iterator_entry(i);
		const char *id, *type;
		if (snd_config_get_id(n, &id) < 0)
			continue;
		if (strcmp(id, "type") == 0) {
			if ((err = snd_config_get_string(n, &type)) < 0)
				return -EINVAL;
			if (strcmp(type, "BOOLEAN") == 0)
				ctype = SND_CTL_ELEM_TYPE_BOOLEAN;
			else if (strcmp(type, "INTEGER") == 0)
				ctype = SND_CTL_ELEM_TYPE_INTEGER;
			else if (strcmp(type, "IEC958") == 0)
				ctype = SND_CTL_ELEM_TYPE_IEC958;
			else
				return -EINVAL;
			continue;
		}
		if (strcmp(id, "range") == 0) {
			const char *s;
			if ((err = snd_config_get_string(n, &s)) < 0)
				return -EINVAL;
			switch (ctype) {
			case SND_CTL_ELEM_TYPE_INTEGER:
				err = sscanf(s, "%li - %li (step %li)", &imin, &imax, &istep);
				if (err != 3) {
					istep = 0;
					err = sscanf(s, "%li - %li", &imin, &imax);
					if (err != 2)
						return -EINVAL;
				}
				break;
			default:
				return -EINVAL;
			}
			continue;
		}
		if (strcmp(id, "count") == 0) {
			long v;
			if ((err = snd_config_get_integer(n, &v)) < 0)
				return err;
			count = v;
			continue;
		}
		if (strcmp(id, "tlv") == 0) {
			const char *s;
			if ((err = snd_config_get_string(n, &s)) < 0)
				return -EINVAL;
			if (tlv)
				free(tlv);
			if ((tlv = str_to_tlv(s)) == NULL)
				return -EINVAL;
			continue;
		}
	}

	snd_ctl_elem_id_alloca(&id);
	snd_ctl_elem_info_get_id(info, id);
	if (count <= 0)
		count = 1;
	switch (ctype) {
	case SND_CTL_ELEM_TYPE_INTEGER:
		if (imin > imax || istep > imax - imin)
			return -EINVAL;
		err = snd_ctl_elem_add_integer(handle, id, count, imin, imax, istep);
		if (err < 0)
			goto error;
		if (tlv) {
			fprintf(stderr, "XXX write TLV...\n");
			snd_ctl_elem_tlv_write(handle, id, tlv);
		}
		break;
	case SND_CTL_ELEM_TYPE_BOOLEAN:
		err = snd_ctl_elem_add_boolean(handle, id, count);
		break;
	case SND_CTL_ELEM_TYPE_IEC958:
		err = snd_ctl_elem_add_iec958(handle, id);
		break;
	default:
		err = -EINVAL;
		break;
	}

 error:
	free(tlv);
	if (err < 0)
		return err;
	return snd_ctl_elem_info(handle, info);
}

static int set_control(snd_ctl_t *handle, snd_config_t *control)
{
	snd_ctl_elem_value_t *ctl;
	snd_ctl_elem_info_t *info;
	snd_config_iterator_t i, next;
	unsigned int numid1;
	snd_ctl_elem_iface_t iface = -1;
	int iface1;
	const char *name1;
	unsigned int numid;
	snd_ctl_elem_type_t type;
	unsigned int count;
	long device = -1;
	long device1;
	long subdevice = -1;
	long subdevice1;
	const char *name = NULL;
	long index1;
	long index = -1;
	snd_config_t *value = NULL;
	snd_config_t *comment = NULL;
	long val;
	long long lval;
	unsigned int idx;
	int err;
	char *set;
	const char *id;
	snd_ctl_elem_value_alloca(&ctl);
	snd_ctl_elem_info_alloca(&info);
	if (snd_config_get_type(control) != SND_CONFIG_TYPE_COMPOUND) {
		error("control is not a compound");
		return -EINVAL;
	}
	err = snd_config_get_id(control, &id);
	if (err < 0) {
		error("unable to get id");
		return -EINVAL;
	}
	numid = atoi(id);
	snd_config_for_each(i, next, control) {
		snd_config_t *n = snd_config_iterator_entry(i);
		const char *fld;
		if (snd_config_get_id(n, &fld) < 0)
			continue;
		if (strcmp(fld, "comment") == 0) {
			if (snd_config_get_type(n) != SND_CONFIG_TYPE_COMPOUND) {
				error("control.%d.%s is invalid", numid, fld);
				return -EINVAL;
			}
			comment = n;
			continue;
		}
		if (strcmp(fld, "iface") == 0) {
			iface = (snd_ctl_elem_iface_t)config_iface(n);
			if (iface < 0) {
				error("control.%d.%s is invalid", numid, fld);
				return -EINVAL;
			}
			continue;
		}
		if (strcmp(fld, "device") == 0) {
			if (snd_config_get_type(n) != SND_CONFIG_TYPE_INTEGER) {
				error("control.%d.%s is invalid", numid, fld);
				return -EINVAL;
			}
			snd_config_get_integer(n, &device);
			continue;