2 * HD-audio core bus driver
5 #include <linux/init.h>
6 #include <linux/device.h>
7 #include <linux/module.h>
8 #include <linux/export.h>
9 #include <sound/hdaudio.h>
12 static void process_unsol_events(struct work_struct *work);
15 * snd_hdac_bus_init - initialize a HD-audio bas bus
16 * @bus: the pointer to bus object
18 * Returns 0 if successful, or a negative error code.
20 int snd_hdac_bus_init(struct hdac_bus *bus, struct device *dev,
21 const struct hdac_bus_ops *ops)
23 memset(bus, 0, sizeof(*bus));
26 INIT_LIST_HEAD(&bus->codec_list);
27 INIT_WORK(&bus->unsol_work, process_unsol_events);
28 mutex_init(&bus->cmd_mutex);
31 EXPORT_SYMBOL_GPL(snd_hdac_bus_init);
34 * snd_hdac_bus_exit - clean up a HD-audio bas bus
35 * @bus: the pointer to bus object
37 void snd_hdac_bus_exit(struct hdac_bus *bus)
39 WARN_ON(!list_empty(&bus->codec_list));
40 cancel_work_sync(&bus->unsol_work);
42 EXPORT_SYMBOL_GPL(snd_hdac_bus_exit);
45 * snd_hdac_bus_exec_verb - execute a HD-audio verb on the given bus
47 * @cmd: HD-audio encoded verb
48 * @res: pointer to store the response, NULL if performing asynchronously
50 * Returns 0 if successful, or a negative error code.
52 int snd_hdac_bus_exec_verb(struct hdac_bus *bus, unsigned int addr,
53 unsigned int cmd, unsigned int *res)
57 mutex_lock(&bus->cmd_mutex);
58 err = snd_hdac_bus_exec_verb_unlocked(bus, addr, cmd, res);
59 mutex_unlock(&bus->cmd_mutex);
62 EXPORT_SYMBOL_GPL(snd_hdac_bus_exec_verb);
65 * snd_hdac_bus_exec_verb_unlocked - unlocked version
67 * @cmd: HD-audio encoded verb
68 * @res: pointer to store the response, NULL if performing asynchronously
70 * Returns 0 if successful, or a negative error code.
72 int snd_hdac_bus_exec_verb_unlocked(struct hdac_bus *bus, unsigned int addr,
73 unsigned int cmd, unsigned int *res)
83 else if (bus->sync_write)
86 trace_hda_send_cmd(bus, cmd);
87 err = bus->ops->command(bus, cmd);
90 /* process pending verbs */
91 err = bus->ops->get_response(bus, addr, &tmp);
96 err = bus->ops->get_response(bus, addr, res);
97 trace_hda_get_response(bus, addr, *res);
101 EXPORT_SYMBOL_GPL(snd_hdac_bus_exec_verb_unlocked);
104 * snd_hdac_bus_queue_event - add an unsolicited event to queue
106 * @res: unsolicited event (lower 32bit of RIRB entry)
107 * @res_ex: codec addr and flags (upper 32bit or RIRB entry)
109 * Adds the given event to the queue. The events are processed in
110 * the workqueue asynchronously. Call this function in the interrupt
111 * hanlder when RIRB receives an unsolicited event.
113 void snd_hdac_bus_queue_event(struct hdac_bus *bus, u32 res, u32 res_ex)
120 trace_hda_unsol_event(bus, res, res_ex);
121 wp = (bus->unsol_wp + 1) % HDA_UNSOL_QUEUE_SIZE;
125 bus->unsol_queue[wp] = res;
126 bus->unsol_queue[wp + 1] = res_ex;
128 schedule_work(&bus->unsol_work);
130 EXPORT_SYMBOL_GPL(snd_hdac_bus_queue_event);
133 * process queued unsolicited events
135 static void process_unsol_events(struct work_struct *work)
137 struct hdac_bus *bus = container_of(work, struct hdac_bus, unsol_work);
138 struct hdac_device *codec;
139 struct hdac_driver *drv;
140 unsigned int rp, caddr, res;
142 while (bus->unsol_rp != bus->unsol_wp) {
143 rp = (bus->unsol_rp + 1) % HDA_UNSOL_QUEUE_SIZE;
146 res = bus->unsol_queue[rp];
147 caddr = bus->unsol_queue[rp + 1];
148 if (!(caddr & (1 << 4))) /* no unsolicited event? */
150 codec = bus->caddr_tbl[caddr & 0x0f];
151 if (!codec || !codec->dev.driver)
153 drv = drv_to_hdac_driver(codec->dev.driver);
154 if (drv->unsol_event)
155 drv->unsol_event(codec, res);
159 int snd_hdac_bus_add_device(struct hdac_bus *bus, struct hdac_device *codec)
161 if (bus->caddr_tbl[codec->addr]) {
162 dev_err(bus->dev, "address 0x%x is already occupied\n",
167 list_add_tail(&codec->list, &bus->codec_list);
168 bus->caddr_tbl[codec->addr] = codec;
169 set_bit(codec->addr, &bus->codec_powered);
173 EXPORT_SYMBOL_GPL(snd_hdac_bus_add_device);
175 void snd_hdac_bus_remove_device(struct hdac_bus *bus,
176 struct hdac_device *codec)
178 WARN_ON(bus != codec->bus);
179 if (list_empty(&codec->list))
181 list_del_init(&codec->list);
182 bus->caddr_tbl[codec->addr] = NULL;
183 clear_bit(codec->addr, &bus->codec_powered);
186 EXPORT_SYMBOL_GPL(snd_hdac_bus_remove_device);