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- /*
- * HD-audio core bus driver
- */
- #include <linux/init.h>
- #include <linux/device.h>
- #include <linux/module.h>
- #include <linux/export.h>
- #include <sound/hdaudio.h>
- #include "trace.h"
- static void process_unsol_events(struct work_struct *work);
- static const struct hdac_bus_ops default_ops = {
- .command = snd_hdac_bus_send_cmd,
- .get_response = snd_hdac_bus_get_response,
- };
- /**
- * snd_hdac_bus_init - initialize a HD-audio bas bus
- * @bus: the pointer to bus object
- * @ops: bus verb operators
- * @io_ops: lowlevel I/O operators
- *
- * Returns 0 if successful, or a negative error code.
- */
- int snd_hdac_bus_init(struct hdac_bus *bus, struct device *dev,
- const struct hdac_bus_ops *ops,
- const struct hdac_io_ops *io_ops)
- {
- memset(bus, 0, sizeof(*bus));
- bus->dev = dev;
- if (ops)
- bus->ops = ops;
- else
- bus->ops = &default_ops;
- bus->io_ops = io_ops;
- INIT_LIST_HEAD(&bus->stream_list);
- INIT_LIST_HEAD(&bus->codec_list);
- INIT_WORK(&bus->unsol_work, process_unsol_events);
- spin_lock_init(&bus->reg_lock);
- mutex_init(&bus->cmd_mutex);
- bus->irq = -1;
- return 0;
- }
- EXPORT_SYMBOL_GPL(snd_hdac_bus_init);
- /**
- * snd_hdac_bus_exit - clean up a HD-audio bas bus
- * @bus: the pointer to bus object
- */
- void snd_hdac_bus_exit(struct hdac_bus *bus)
- {
- WARN_ON(!list_empty(&bus->stream_list));
- WARN_ON(!list_empty(&bus->codec_list));
- cancel_work_sync(&bus->unsol_work);
- }
- EXPORT_SYMBOL_GPL(snd_hdac_bus_exit);
- /**
- * snd_hdac_bus_exec_verb - execute a HD-audio verb on the given bus
- * @bus: bus object
- * @cmd: HD-audio encoded verb
- * @res: pointer to store the response, NULL if performing asynchronously
- *
- * Returns 0 if successful, or a negative error code.
- */
- int snd_hdac_bus_exec_verb(struct hdac_bus *bus, unsigned int addr,
- unsigned int cmd, unsigned int *res)
- {
- int err;
- mutex_lock(&bus->cmd_mutex);
- err = snd_hdac_bus_exec_verb_unlocked(bus, addr, cmd, res);
- mutex_unlock(&bus->cmd_mutex);
- return err;
- }
- EXPORT_SYMBOL_GPL(snd_hdac_bus_exec_verb);
- /**
- * snd_hdac_bus_exec_verb_unlocked - unlocked version
- * @bus: bus object
- * @cmd: HD-audio encoded verb
- * @res: pointer to store the response, NULL if performing asynchronously
- *
- * Returns 0 if successful, or a negative error code.
- */
- int snd_hdac_bus_exec_verb_unlocked(struct hdac_bus *bus, unsigned int addr,
- unsigned int cmd, unsigned int *res)
- {
- unsigned int tmp;
- int err;
- if (cmd == ~0)
- return -EINVAL;
- if (res)
- *res = -1;
- else if (bus->sync_write)
- res = &tmp;
- for (;;) {
- trace_hda_send_cmd(bus, cmd);
- err = bus->ops->command(bus, cmd);
- if (err != -EAGAIN)
- break;
- /* process pending verbs */
- err = bus->ops->get_response(bus, addr, &tmp);
- if (err)
- break;
- }
- if (!err && res) {
- err = bus->ops->get_response(bus, addr, res);
- trace_hda_get_response(bus, addr, *res);
- }
- return err;
- }
- EXPORT_SYMBOL_GPL(snd_hdac_bus_exec_verb_unlocked);
- /**
- * snd_hdac_bus_queue_event - add an unsolicited event to queue
- * @bus: the BUS
- * @res: unsolicited event (lower 32bit of RIRB entry)
- * @res_ex: codec addr and flags (upper 32bit or RIRB entry)
- *
- * Adds the given event to the queue. The events are processed in
- * the workqueue asynchronously. Call this function in the interrupt
- * hanlder when RIRB receives an unsolicited event.
- */
- void snd_hdac_bus_queue_event(struct hdac_bus *bus, u32 res, u32 res_ex)
- {
- unsigned int wp;
- if (!bus)
- return;
- trace_hda_unsol_event(bus, res, res_ex);
- wp = (bus->unsol_wp + 1) % HDA_UNSOL_QUEUE_SIZE;
- bus->unsol_wp = wp;
- wp <<= 1;
- bus->unsol_queue[wp] = res;
- bus->unsol_queue[wp + 1] = res_ex;
- schedule_work(&bus->unsol_work);
- }
- EXPORT_SYMBOL_GPL(snd_hdac_bus_queue_event);
- /*
- * process queued unsolicited events
- */
- static void process_unsol_events(struct work_struct *work)
- {
- struct hdac_bus *bus = container_of(work, struct hdac_bus, unsol_work);
- struct hdac_device *codec;
- struct hdac_driver *drv;
- unsigned int rp, caddr, res;
- while (bus->unsol_rp != bus->unsol_wp) {
- rp = (bus->unsol_rp + 1) % HDA_UNSOL_QUEUE_SIZE;
- bus->unsol_rp = rp;
- rp <<= 1;
- res = bus->unsol_queue[rp];
- caddr = bus->unsol_queue[rp + 1];
- if (!(caddr & (1 << 4))) /* no unsolicited event? */
- continue;
- codec = bus->caddr_tbl[caddr & 0x0f];
- if (!codec || !codec->dev.driver)
- continue;
- drv = drv_to_hdac_driver(codec->dev.driver);
- if (drv->unsol_event)
- drv->unsol_event(codec, res);
- }
- }
- /**
- * snd_hdac_bus_add_device - Add a codec to bus
- * @bus: HDA core bus
- * @codec: HDA core device to add
- *
- * Adds the given codec to the list in the bus. The caddr_tbl array
- * and codec_powered bits are updated, as well.
- * Returns zero if success, or a negative error code.
- */
- int snd_hdac_bus_add_device(struct hdac_bus *bus, struct hdac_device *codec)
- {
- if (bus->caddr_tbl[codec->addr]) {
- dev_err(bus->dev, "address 0x%x is already occupied\n",
- codec->addr);
- return -EBUSY;
- }
- list_add_tail(&codec->list, &bus->codec_list);
- bus->caddr_tbl[codec->addr] = codec;
- set_bit(codec->addr, &bus->codec_powered);
- bus->num_codecs++;
- return 0;
- }
- EXPORT_SYMBOL_GPL(snd_hdac_bus_add_device);
- /**
- * snd_hdac_bus_remove_device - Remove a codec from bus
- * @bus: HDA core bus
- * @codec: HDA core device to remove
- */
- void snd_hdac_bus_remove_device(struct hdac_bus *bus,
- struct hdac_device *codec)
- {
- WARN_ON(bus != codec->bus);
- if (list_empty(&codec->list))
- return;
- list_del_init(&codec->list);
- bus->caddr_tbl[codec->addr] = NULL;
- clear_bit(codec->addr, &bus->codec_powered);
- bus->num_codecs--;
- }
- EXPORT_SYMBOL_GPL(snd_hdac_bus_remove_device);
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