1 // SPDX-License-Identifier: GPL-2.0+
3  * virtio-snd: Virtio sound device
40  * virtsnd_kctl_info() - Returns information about the control.
45  * Return: 0 on success, -errno on failure.
50 	struct virtio_snd *snd = kcontrol->private_data;  in virtsnd_kctl_info()
51 	struct virtio_kctl *kctl = &snd->kctls[kcontrol->private_value];  in virtsnd_kctl_info()
53 		&snd->kctl_infos[kcontrol->private_value];  in virtsnd_kctl_info()
56 	uinfo->type = g_v2a_type_map[le32_to_cpu(kinfo->type)];  in virtsnd_kctl_info()
57 	uinfo->count = le32_to_cpu(kinfo->count);  in virtsnd_kctl_info()
59 	switch (uinfo->type) {  in virtsnd_kctl_info()
61 		uinfo->value.integer.min =  in virtsnd_kctl_info()
62 			le32_to_cpu(kinfo->value.integer.min);  in virtsnd_kctl_info()
63 		uinfo->value.integer.max =  in virtsnd_kctl_info()
64 			le32_to_cpu(kinfo->value.integer.max);  in virtsnd_kctl_info()
65 		uinfo->value.integer.step =  in virtsnd_kctl_info()
66 			le32_to_cpu(kinfo->value.integer.step);  in virtsnd_kctl_info()
70 		uinfo->value.integer64.min =  in virtsnd_kctl_info()
71 			le64_to_cpu(kinfo->value.integer64.min);  in virtsnd_kctl_info()
72 		uinfo->value.integer64.max =  in virtsnd_kctl_info()
73 			le64_to_cpu(kinfo->value.integer64.max);  in virtsnd_kctl_info()
74 		uinfo->value.integer64.step =  in virtsnd_kctl_info()
75 			le64_to_cpu(kinfo->value.integer64.step);  in virtsnd_kctl_info()
79 		uinfo->value.enumerated.items =  in virtsnd_kctl_info()
80 			le32_to_cpu(kinfo->value.enumerated.items);  in virtsnd_kctl_info()
81 		i = uinfo->value.enumerated.item;  in virtsnd_kctl_info()
82 		if (i >= uinfo->value.enumerated.items)  in virtsnd_kctl_info()
83 			return -EINVAL;  in virtsnd_kctl_info()
85 		strscpy(uinfo->value.enumerated.name, kctl->items[i].item,  in virtsnd_kctl_info()
86 			sizeof(uinfo->value.enumerated.name));  in virtsnd_kctl_info()
95  * virtsnd_kctl_get() - Read the value from the control.
100  * Return: 0 on success, -errno on failure.
105 	struct virtio_snd *snd = kcontrol->private_data;  in virtsnd_kctl_get()
107 		&snd->kctl_infos[kcontrol->private_value];  in virtsnd_kctl_get()
108 	unsigned int type = le32_to_cpu(kinfo->type);  in virtsnd_kctl_get()
109 	unsigned int count = le32_to_cpu(kinfo->count);  in virtsnd_kctl_get()
110 	struct virtio_snd_msg *msg;  in virtsnd_kctl_get()  local
118 	msg = virtsnd_ctl_msg_alloc(request_size, response_size, GFP_KERNEL);  in virtsnd_kctl_get()
119 	if (!msg)  in virtsnd_kctl_get()
120 		return -ENOMEM;  in virtsnd_kctl_get()
122 	virtsnd_ctl_msg_ref(msg);  in virtsnd_kctl_get()
124 	hdr = virtsnd_ctl_msg_request(msg);  in virtsnd_kctl_get()
125 	hdr->hdr.code = cpu_to_le32(VIRTIO_SND_R_CTL_READ);  in virtsnd_kctl_get()
126 	hdr->control_id = cpu_to_le32(kcontrol->private_value);  in virtsnd_kctl_get()
128 	rc = virtsnd_ctl_msg_send_sync(snd, msg);  in virtsnd_kctl_get()
132 	kvalue = (void *)((u8 *)virtsnd_ctl_msg_response(msg) +  in virtsnd_kctl_get()
139 			uvalue->value.integer.value[i] =  in virtsnd_kctl_get()
140 				le32_to_cpu(kvalue->value.integer[i]);  in virtsnd_kctl_get()
144 			uvalue->value.integer64.value[i] =  in virtsnd_kctl_get()
145 				le64_to_cpu(kvalue->value.integer64[i]);  in virtsnd_kctl_get()
149 			uvalue->value.enumerated.item[i] =  in virtsnd_kctl_get()
150 				le32_to_cpu(kvalue->value.enumerated[i]);  in virtsnd_kctl_get()
153 		memcpy(uvalue->value.bytes.data, kvalue->value.bytes, count);  in virtsnd_kctl_get()
156 		memcpy(&uvalue->value.iec958, &kvalue->value.iec958,  in virtsnd_kctl_get()
157 		       sizeof(uvalue->value.iec958));  in virtsnd_kctl_get()
162 	virtsnd_ctl_msg_unref(msg);  in virtsnd_kctl_get()
168  * virtsnd_kctl_put() - Write the value to the control.
173  * Return: 0 on success, -errno on failure.
178 	struct virtio_snd *snd = kcontrol->private_data;  in virtsnd_kctl_put()
180 		&snd->kctl_infos[kcontrol->private_value];  in virtsnd_kctl_put()
181 	unsigned int type = le32_to_cpu(kinfo->type);  in virtsnd_kctl_put()
182 	unsigned int count = le32_to_cpu(kinfo->count);  in virtsnd_kctl_put()
183 	struct virtio_snd_msg *msg;  in virtsnd_kctl_put()  local
190 	msg = virtsnd_ctl_msg_alloc(request_size, response_size, GFP_KERNEL);  in virtsnd_kctl_put()
191 	if (!msg)  in virtsnd_kctl_put()
192 		return -ENOMEM;  in virtsnd_kctl_put()
194 	hdr = virtsnd_ctl_msg_request(msg);  in virtsnd_kctl_put()
195 	hdr->hdr.code = cpu_to_le32(VIRTIO_SND_R_CTL_WRITE);  in virtsnd_kctl_put()
196 	hdr->control_id = cpu_to_le32(kcontrol->private_value);  in virtsnd_kctl_put()
204 			kvalue->value.integer[i] =  in virtsnd_kctl_put()
205 				cpu_to_le32(uvalue->value.integer.value[i]);  in virtsnd_kctl_put()
209 			kvalue->value.integer64[i] =  in virtsnd_kctl_put()
210 				cpu_to_le64(uvalue->value.integer64.value[i]);  in virtsnd_kctl_put()
214 			kvalue->value.enumerated[i] =  in virtsnd_kctl_put()
215 				cpu_to_le32(uvalue->value.enumerated.item[i]);  in virtsnd_kctl_put()
218 		memcpy(kvalue->value.bytes, uvalue->value.bytes.data, count);  in virtsnd_kctl_put()
221 		memcpy(&kvalue->value.iec958, &uvalue->value.iec958,  in virtsnd_kctl_put()
222 		       sizeof(kvalue->value.iec958));  in virtsnd_kctl_put()
226 	return virtsnd_ctl_msg_send_sync(snd, msg);  in virtsnd_kctl_put()
230  * virtsnd_kctl_tlv_op() - Perform an operation on the control's metadata.
233  * @size: Size of the TLV data in bytes.
237  * Return: 0 on success, -errno on failure.
240 			       unsigned int size, unsigned int __user *utlv)  in virtsnd_kctl_tlv_op()  argument
242 	struct virtio_snd *snd = kcontrol->private_data;  in virtsnd_kctl_tlv_op()
243 	struct virtio_snd_msg *msg;  in virtsnd_kctl_tlv_op()  local
249 	msg = virtsnd_ctl_msg_alloc(sizeof(*hdr), sizeof(struct virtio_snd_hdr),  in virtsnd_kctl_tlv_op()
251 	if (!msg)  in virtsnd_kctl_tlv_op()
252 		return -ENOMEM;  in virtsnd_kctl_tlv_op()
254 	tlv = kzalloc(size, GFP_KERNEL);  in virtsnd_kctl_tlv_op()
256 		rc = -ENOMEM;  in virtsnd_kctl_tlv_op()
260 	sg_init_one(&sg, tlv, size);  in virtsnd_kctl_tlv_op()
262 	hdr = virtsnd_ctl_msg_request(msg);  in virtsnd_kctl_tlv_op()
263 	hdr->control_id = cpu_to_le32(kcontrol->private_value);  in virtsnd_kctl_tlv_op()
267 		hdr->hdr.code = cpu_to_le32(VIRTIO_SND_R_CTL_TLV_READ);  in virtsnd_kctl_tlv_op()
269 		rc = virtsnd_ctl_msg_send(snd, msg, NULL, &sg, false);  in virtsnd_kctl_tlv_op()
271 			if (copy_to_user(utlv, tlv, size))  in virtsnd_kctl_tlv_op()
272 				rc = -EFAULT;  in virtsnd_kctl_tlv_op()
279 			hdr->hdr.code = cpu_to_le32(VIRTIO_SND_R_CTL_TLV_WRITE);  in virtsnd_kctl_tlv_op()
281 			hdr->hdr.code =  in virtsnd_kctl_tlv_op()
284 		if (copy_from_user(tlv, utlv, size)) {  in virtsnd_kctl_tlv_op()
285 			rc = -EFAULT;  in virtsnd_kctl_tlv_op()
288 			rc = virtsnd_ctl_msg_send(snd, msg, &sg, NULL, false);  in virtsnd_kctl_tlv_op()
293 		rc = -EINVAL;  in virtsnd_kctl_tlv_op()
294 		/* We never get here - we listed all values for op_flag */  in virtsnd_kctl_tlv_op()
302 	virtsnd_ctl_msg_unref(msg);  in virtsnd_kctl_tlv_op()
309  * virtsnd_kctl_get_enum_items() - Query items for the ENUMERATED element type.
316  * Return: 0 on success, -errno on failure.
320 	struct virtio_device *vdev = snd->vdev;  in virtsnd_kctl_get_enum_items()
321 	struct virtio_snd_ctl_info *kinfo = &snd->kctl_infos[cid];  in virtsnd_kctl_get_enum_items()
322 	struct virtio_kctl *kctl = &snd->kctls[cid];  in virtsnd_kctl_get_enum_items()
323 	struct virtio_snd_msg *msg;  in virtsnd_kctl_get_enum_items()  local
325 	unsigned int n = le32_to_cpu(kinfo->value.enumerated.items);  in virtsnd_kctl_get_enum_items()
328 	msg = virtsnd_ctl_msg_alloc(sizeof(*hdr),  in virtsnd_kctl_get_enum_items()
330 	if (!msg)  in virtsnd_kctl_get_enum_items()
331 		return -ENOMEM;  in virtsnd_kctl_get_enum_items()
333 	kctl->items = devm_kcalloc(&vdev->dev, n, sizeof(*kctl->items),  in virtsnd_kctl_get_enum_items()
335 	if (!kctl->items) {  in virtsnd_kctl_get_enum_items()
336 		virtsnd_ctl_msg_unref(msg);  in virtsnd_kctl_get_enum_items()
337 		return -ENOMEM;  in virtsnd_kctl_get_enum_items()
340 	sg_init_one(&sg, kctl->items, n * sizeof(*kctl->items));  in virtsnd_kctl_get_enum_items()
342 	hdr = virtsnd_ctl_msg_request(msg);  in virtsnd_kctl_get_enum_items()
343 	hdr->hdr.code = cpu_to_le32(VIRTIO_SND_R_CTL_ENUM_ITEMS);  in virtsnd_kctl_get_enum_items()
344 	hdr->control_id = cpu_to_le32(cid);  in virtsnd_kctl_get_enum_items()
346 	return virtsnd_ctl_msg_send(snd, msg, NULL, &sg, false);  in virtsnd_kctl_get_enum_items()
350  * virtsnd_kctl_parse_cfg() - Parse the control element configuration.
356  * Return: 0 on success, -errno on failure.
360 	struct virtio_device *vdev = snd->vdev;  in virtsnd_kctl_parse_cfg()
365 			&snd->nkctls);  in virtsnd_kctl_parse_cfg()
366 	if (!snd->nkctls)  in virtsnd_kctl_parse_cfg()
369 	snd->kctl_infos = devm_kcalloc(&vdev->dev, snd->nkctls,  in virtsnd_kctl_parse_cfg()
370 				       sizeof(*snd->kctl_infos), GFP_KERNEL);  in virtsnd_kctl_parse_cfg()
371 	if (!snd->kctl_infos)  in virtsnd_kctl_parse_cfg()
372 		return -ENOMEM;  in virtsnd_kctl_parse_cfg()
374 	snd->kctls = devm_kcalloc(&vdev->dev, snd->nkctls, sizeof(*snd->kctls),  in virtsnd_kctl_parse_cfg()
376 	if (!snd->kctls)  in virtsnd_kctl_parse_cfg()
377 		return -ENOMEM;  in virtsnd_kctl_parse_cfg()
379 	rc = virtsnd_ctl_query_info(snd, VIRTIO_SND_R_CTL_INFO, 0, snd->nkctls,  in virtsnd_kctl_parse_cfg()
380 				    sizeof(*snd->kctl_infos), snd->kctl_infos);  in virtsnd_kctl_parse_cfg()
384 	for (i = 0; i < snd->nkctls; ++i) {  in virtsnd_kctl_parse_cfg()
385 		struct virtio_snd_ctl_info *kinfo = &snd->kctl_infos[i];  in virtsnd_kctl_parse_cfg()
386 		unsigned int type = le32_to_cpu(kinfo->type);  in virtsnd_kctl_parse_cfg()
399  * virtsnd_kctl_build_devs() - Build ALSA control elements.
403  * Return: 0 on success, -errno on failure.
409 	for (cid = 0; cid < snd->nkctls; ++cid) {  in virtsnd_kctl_build_devs()
410 		struct virtio_snd_ctl_info *kinfo = &snd->kctl_infos[cid];  in virtsnd_kctl_build_devs()
411 		struct virtio_kctl *kctl = &snd->kctls[cid];  in virtsnd_kctl_build_devs()
419 		kctl_new.name = kinfo->name;  in virtsnd_kctl_build_devs()
420 		kctl_new.index = le32_to_cpu(kinfo->index);  in virtsnd_kctl_build_devs()
423 			if (le32_to_cpu(kinfo->access) & (1 << i))  in virtsnd_kctl_build_devs()
438 		kctl->kctl = snd_ctl_new1(&kctl_new, snd);  in virtsnd_kctl_build_devs()
439 		if (!kctl->kctl)  in virtsnd_kctl_build_devs()
440 			return -ENOMEM;  in virtsnd_kctl_build_devs()
442 		rc = snd_ctl_add(snd->card, kctl->kctl);  in virtsnd_kctl_build_devs()
451  * virtsnd_kctl_event() - Handle the control element event notification.
462 	unsigned int cid = le16_to_cpu(kevent->control_id);  in virtsnd_kctl_event()
466 	if (cid >= snd->nkctls)  in virtsnd_kctl_event()
470 		if (le16_to_cpu(kevent->mask) & (1 << i))  in virtsnd_kctl_event()
474 	kctl = &snd->kctls[cid];  in virtsnd_kctl_event()
476 	snd_ctl_notify(snd->card, mask, &kctl->kctl->id);  in virtsnd_kctl_event()