![Takashi Iwai](/assets/img/avatar_default.png)
This patch adds the controller helper codes to hda-core library. The I/O access ops are added to the bus ops. The CORB/RIRB, the basic attributes like irq# and iomap address, some locks and the list of streams are added to the bus object, together with the stream object and its helpers. Currently the codes are just copied from the legacy driver, so you can find duplicated codes in both directories. Only constants are removed from the original hda_controller.h. More integration work will follow in the later patches. Signed-off-by: Takashi Iwai <tiwai@suse.de>
203 lines
5 KiB
C
203 lines
5 KiB
C
/*
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* HD-audio core bus driver
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*/
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#include <linux/init.h>
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#include <linux/device.h>
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#include <linux/module.h>
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#include <linux/export.h>
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#include <sound/hdaudio.h>
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#include "trace.h"
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static void process_unsol_events(struct work_struct *work);
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static const struct hdac_bus_ops default_ops = {
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.command = snd_hdac_bus_send_cmd,
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.get_response = snd_hdac_bus_get_response,
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};
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/**
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* snd_hdac_bus_init - initialize a HD-audio bas bus
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* @bus: the pointer to bus object
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* @ops: bus verb operators
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* @io_ops: lowlevel I/O operators
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*
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* Returns 0 if successful, or a negative error code.
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*/
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int snd_hdac_bus_init(struct hdac_bus *bus, struct device *dev,
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const struct hdac_bus_ops *ops,
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const struct hdac_io_ops *io_ops)
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{
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memset(bus, 0, sizeof(*bus));
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bus->dev = dev;
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if (ops)
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bus->ops = ops;
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else
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bus->ops = &default_ops;
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bus->io_ops = io_ops;
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INIT_LIST_HEAD(&bus->stream_list);
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INIT_LIST_HEAD(&bus->codec_list);
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INIT_WORK(&bus->unsol_work, process_unsol_events);
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spin_lock_init(&bus->reg_lock);
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mutex_init(&bus->cmd_mutex);
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bus->irq = -1;
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return 0;
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}
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EXPORT_SYMBOL_GPL(snd_hdac_bus_init);
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/**
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* snd_hdac_bus_exit - clean up a HD-audio bas bus
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* @bus: the pointer to bus object
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*/
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void snd_hdac_bus_exit(struct hdac_bus *bus)
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{
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WARN_ON(!list_empty(&bus->stream_list));
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WARN_ON(!list_empty(&bus->codec_list));
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cancel_work_sync(&bus->unsol_work);
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}
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EXPORT_SYMBOL_GPL(snd_hdac_bus_exit);
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/**
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* snd_hdac_bus_exec_verb - execute a HD-audio verb on the given bus
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* @bus: bus object
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* @cmd: HD-audio encoded verb
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* @res: pointer to store the response, NULL if performing asynchronously
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*
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* Returns 0 if successful, or a negative error code.
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*/
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int snd_hdac_bus_exec_verb(struct hdac_bus *bus, unsigned int addr,
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unsigned int cmd, unsigned int *res)
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{
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int err;
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mutex_lock(&bus->cmd_mutex);
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err = snd_hdac_bus_exec_verb_unlocked(bus, addr, cmd, res);
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mutex_unlock(&bus->cmd_mutex);
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return err;
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}
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EXPORT_SYMBOL_GPL(snd_hdac_bus_exec_verb);
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/**
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* snd_hdac_bus_exec_verb_unlocked - unlocked version
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* @bus: bus object
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* @cmd: HD-audio encoded verb
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* @res: pointer to store the response, NULL if performing asynchronously
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*
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* Returns 0 if successful, or a negative error code.
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*/
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int snd_hdac_bus_exec_verb_unlocked(struct hdac_bus *bus, unsigned int addr,
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unsigned int cmd, unsigned int *res)
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{
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unsigned int tmp;
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int err;
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if (cmd == ~0)
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return -EINVAL;
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if (res)
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*res = -1;
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else if (bus->sync_write)
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res = &tmp;
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for (;;) {
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trace_hda_send_cmd(bus, cmd);
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err = bus->ops->command(bus, cmd);
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if (err != -EAGAIN)
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break;
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/* process pending verbs */
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err = bus->ops->get_response(bus, addr, &tmp);
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if (err)
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break;
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}
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if (!err && res) {
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err = bus->ops->get_response(bus, addr, res);
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trace_hda_get_response(bus, addr, *res);
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}
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return err;
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}
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EXPORT_SYMBOL_GPL(snd_hdac_bus_exec_verb_unlocked);
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/**
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* snd_hdac_bus_queue_event - add an unsolicited event to queue
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* @bus: the BUS
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* @res: unsolicited event (lower 32bit of RIRB entry)
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* @res_ex: codec addr and flags (upper 32bit or RIRB entry)
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*
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* Adds the given event to the queue. The events are processed in
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* the workqueue asynchronously. Call this function in the interrupt
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* hanlder when RIRB receives an unsolicited event.
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*/
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void snd_hdac_bus_queue_event(struct hdac_bus *bus, u32 res, u32 res_ex)
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{
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unsigned int wp;
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if (!bus)
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return;
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trace_hda_unsol_event(bus, res, res_ex);
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wp = (bus->unsol_wp + 1) % HDA_UNSOL_QUEUE_SIZE;
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bus->unsol_wp = wp;
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wp <<= 1;
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bus->unsol_queue[wp] = res;
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bus->unsol_queue[wp + 1] = res_ex;
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schedule_work(&bus->unsol_work);
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}
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EXPORT_SYMBOL_GPL(snd_hdac_bus_queue_event);
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/*
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* process queued unsolicited events
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*/
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static void process_unsol_events(struct work_struct *work)
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{
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struct hdac_bus *bus = container_of(work, struct hdac_bus, unsol_work);
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struct hdac_device *codec;
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struct hdac_driver *drv;
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unsigned int rp, caddr, res;
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while (bus->unsol_rp != bus->unsol_wp) {
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rp = (bus->unsol_rp + 1) % HDA_UNSOL_QUEUE_SIZE;
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bus->unsol_rp = rp;
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rp <<= 1;
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res = bus->unsol_queue[rp];
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caddr = bus->unsol_queue[rp + 1];
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if (!(caddr & (1 << 4))) /* no unsolicited event? */
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continue;
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codec = bus->caddr_tbl[caddr & 0x0f];
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if (!codec || !codec->dev.driver)
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continue;
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drv = drv_to_hdac_driver(codec->dev.driver);
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if (drv->unsol_event)
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drv->unsol_event(codec, res);
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}
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}
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int snd_hdac_bus_add_device(struct hdac_bus *bus, struct hdac_device *codec)
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{
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if (bus->caddr_tbl[codec->addr]) {
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dev_err(bus->dev, "address 0x%x is already occupied\n",
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codec->addr);
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return -EBUSY;
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}
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list_add_tail(&codec->list, &bus->codec_list);
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bus->caddr_tbl[codec->addr] = codec;
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set_bit(codec->addr, &bus->codec_powered);
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bus->num_codecs++;
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return 0;
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}
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EXPORT_SYMBOL_GPL(snd_hdac_bus_add_device);
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void snd_hdac_bus_remove_device(struct hdac_bus *bus,
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struct hdac_device *codec)
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{
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WARN_ON(bus != codec->bus);
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if (list_empty(&codec->list))
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return;
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list_del_init(&codec->list);
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bus->caddr_tbl[codec->addr] = NULL;
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clear_bit(codec->addr, &bus->codec_powered);
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bus->num_codecs--;
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}
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EXPORT_SYMBOL_GPL(snd_hdac_bus_remove_device);
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