1 // SPDX-License-Identifier: GPL-2.0-only
3  * HD-audio core bus driver
23  * snd_hdac_bus_init - initialize a HD-audio bas bus
34 	bus->dev = dev;  in snd_hdac_bus_init()
36 		bus->ops = ops;  in snd_hdac_bus_init()
38 		bus->ops = &default_ops;  in snd_hdac_bus_init()
39 	bus->dma_type = SNDRV_DMA_TYPE_DEV;  in snd_hdac_bus_init()
40 	INIT_LIST_HEAD(&bus->stream_list);  in snd_hdac_bus_init()
41 	INIT_LIST_HEAD(&bus->codec_list);  in snd_hdac_bus_init()
42 	INIT_WORK(&bus->unsol_work, snd_hdac_bus_process_unsol_events);  in snd_hdac_bus_init()
43 	spin_lock_init(&bus->reg_lock);  in snd_hdac_bus_init()
44 	mutex_init(&bus->cmd_mutex);  in snd_hdac_bus_init()
45 	mutex_init(&bus->lock);  in snd_hdac_bus_init()
46 	INIT_LIST_HEAD(&bus->hlink_list);  in snd_hdac_bus_init()
47 	init_waitqueue_head(&bus->rirb_wq);  in snd_hdac_bus_init()
48 	bus->irq = -1;  in snd_hdac_bus_init()
51 	 * Default value of '8' is as per the HD audio specification (Rev 1.0a).  in snd_hdac_bus_init()
59 	bus->sdo_limit = 8;  in snd_hdac_bus_init()
66  * snd_hdac_bus_exit - clean up a HD-audio bas bus
71 	WARN_ON(!list_empty(&bus->stream_list));  in snd_hdac_bus_exit()
72 	WARN_ON(!list_empty(&bus->codec_list));  in snd_hdac_bus_exit()
73 	cancel_work_sync(&bus->unsol_work);  in snd_hdac_bus_exit()
78  * snd_hdac_bus_exec_verb - execute a HD-audio verb on the given bus
81  * @cmd: HD-audio encoded verb
91 	mutex_lock(&bus->cmd_mutex);  in snd_hdac_bus_exec_verb()
93 	mutex_unlock(&bus->cmd_mutex);  in snd_hdac_bus_exec_verb()
98  * snd_hdac_bus_exec_verb_unlocked - unlocked version
101  * @cmd: HD-audio encoded verb
113 		return -EINVAL;  in snd_hdac_bus_exec_verb_unlocked()
116 		*res = -1;  in snd_hdac_bus_exec_verb_unlocked()
117 	else if (bus->sync_write)  in snd_hdac_bus_exec_verb_unlocked()
121 		err = bus->ops->command(bus, cmd);  in snd_hdac_bus_exec_verb_unlocked()
122 		if (err != -EAGAIN)  in snd_hdac_bus_exec_verb_unlocked()
125 		err = bus->ops->get_response(bus, addr, &tmp);  in snd_hdac_bus_exec_verb_unlocked()
130 		err = bus->ops->get_response(bus, addr, res);  in snd_hdac_bus_exec_verb_unlocked()
138  * snd_hdac_bus_queue_event - add an unsolicited event to queue
155 	wp = (bus->unsol_wp + 1) % HDA_UNSOL_QUEUE_SIZE;  in snd_hdac_bus_queue_event()
156 	bus->unsol_wp = wp;  in snd_hdac_bus_queue_event()
159 	bus->unsol_queue[wp] = res;  in snd_hdac_bus_queue_event()
160 	bus->unsol_queue[wp + 1] = res_ex;  in snd_hdac_bus_queue_event()
162 	schedule_work(&bus->unsol_work);  in snd_hdac_bus_queue_event()
175 	spin_lock_irq(&bus->reg_lock);  in snd_hdac_bus_process_unsol_events()
176 	while (bus->unsol_rp != bus->unsol_wp) {  in snd_hdac_bus_process_unsol_events()
177 		rp = (bus->unsol_rp + 1) % HDA_UNSOL_QUEUE_SIZE;  in snd_hdac_bus_process_unsol_events()
178 		bus->unsol_rp = rp;  in snd_hdac_bus_process_unsol_events()
180 		res = bus->unsol_queue[rp];  in snd_hdac_bus_process_unsol_events()
181 		caddr = bus->unsol_queue[rp + 1];  in snd_hdac_bus_process_unsol_events()
184 		codec = bus->caddr_tbl[caddr & 0x0f];  in snd_hdac_bus_process_unsol_events()
185 		if (!codec || !codec->dev.driver)  in snd_hdac_bus_process_unsol_events()
187 		spin_unlock_irq(&bus->reg_lock);  in snd_hdac_bus_process_unsol_events()
188 		drv = drv_to_hdac_driver(codec->dev.driver);  in snd_hdac_bus_process_unsol_events()
189 		if (drv->unsol_event)  in snd_hdac_bus_process_unsol_events()
190 			drv->unsol_event(codec, res);  in snd_hdac_bus_process_unsol_events()
191 		spin_lock_irq(&bus->reg_lock);  in snd_hdac_bus_process_unsol_events()
193 	spin_unlock_irq(&bus->reg_lock);  in snd_hdac_bus_process_unsol_events()
197  * snd_hdac_bus_add_device - Add a codec to bus
198  * @bus: HDA core bus
199  * @codec: HDA core device to add
207 	if (bus->caddr_tbl[codec->addr]) {  in snd_hdac_bus_add_device()
208 		dev_err(bus->dev, "address 0x%x is already occupied\n",  in snd_hdac_bus_add_device()
209 			codec->addr);  in snd_hdac_bus_add_device()
210 		return -EBUSY;  in snd_hdac_bus_add_device()
213 	list_add_tail(&codec->list, &bus->codec_list);  in snd_hdac_bus_add_device()
214 	bus->caddr_tbl[codec->addr] = codec;  in snd_hdac_bus_add_device()
215 	set_bit(codec->addr, &bus->codec_powered);  in snd_hdac_bus_add_device()
216 	bus->num_codecs++;  in snd_hdac_bus_add_device()
221  * snd_hdac_bus_remove_device - Remove a codec from bus
222  * @bus: HDA core bus
223  * @codec: HDA core device to remove
228 	WARN_ON(bus != codec->bus);  in snd_hdac_bus_remove_device()
229 	if (list_empty(&codec->list))  in snd_hdac_bus_remove_device()
231 	list_del_init(&codec->list);  in snd_hdac_bus_remove_device()
232 	bus->caddr_tbl[codec->addr] = NULL;  in snd_hdac_bus_remove_device()
233 	clear_bit(codec->addr, &bus->codec_powered);  in snd_hdac_bus_remove_device()
234 	bus->num_codecs--;  in snd_hdac_bus_remove_device()
235 	flush_work(&bus->unsol_work);  in snd_hdac_bus_remove_device()