[linux-2.6-block.git] / sound / hda / hdac_bus.c

/*
 * 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);

/**
 * snd_hdac_bus_init - initialize a HD-audio bas bus
 * @bus: the pointer to bus object
 *
 * 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)
{
	memset(bus, 0, sizeof(*bus));
	bus->dev = dev;
	bus->ops = ops;
	INIT_LIST_HEAD(&bus->codec_list);
	INIT_WORK(&bus->unsol_work, process_unsol_events);
	mutex_init(&bus->cmd_mutex);
	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->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);
	}
}

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);

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);
Commit	Line	Data
d068ebc2 TI	1	/*
	2	* HD-audio core bus driver
	3	*/
	4
	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>
e311782a	10	#include "trace.h"
d068ebc2 TI	11
	12	static void process_unsol_events(struct work_struct *work);
	13
	14	/**
	15	* snd_hdac_bus_init - initialize a HD-audio bas bus
	16	* @bus: the pointer to bus object
	17	*
	18	* Returns 0 if successful, or a negative error code.
	19	*/
	20	int snd_hdac_bus_init(struct hdac_bus bus, struct device dev,
	21	const struct hdac_bus_ops *ops)
	22	{
	23	memset(bus, 0, sizeof(*bus));
	24	bus->dev = dev;
	25	bus->ops = ops;
	26	INIT_LIST_HEAD(&bus->codec_list);
	27	INIT_WORK(&bus->unsol_work, process_unsol_events);
	28	mutex_init(&bus->cmd_mutex);
	29	return 0;
	30	}
	31	EXPORT_SYMBOL_GPL(snd_hdac_bus_init);
	32
	33	/**
	34	* snd_hdac_bus_exit - clean up a HD-audio bas bus
	35	* @bus: the pointer to bus object
	36	*/
	37	void snd_hdac_bus_exit(struct hdac_bus *bus)
	38	{
	39	WARN_ON(!list_empty(&bus->codec_list));
	40	cancel_work_sync(&bus->unsol_work);
	41	}
	42	EXPORT_SYMBOL_GPL(snd_hdac_bus_exit);
	43
	44	/**
	45	* snd_hdac_bus_exec_verb - execute a HD-audio verb on the given bus
	46	* @bus: bus object
	47	* @cmd: HD-audio encoded verb
	48	* @res: pointer to store the response, NULL if performing asynchronously
	49	*
	50	* Returns 0 if successful, or a negative error code.
	51	*/
	52	int snd_hdac_bus_exec_verb(struct hdac_bus *bus, unsigned int addr,
	53	unsigned int cmd, unsigned int *res)
	54	{
	55	int err;
	56
	57	mutex_lock(&bus->cmd_mutex);
	58	err = snd_hdac_bus_exec_verb_unlocked(bus, addr, cmd, res);
	59	mutex_unlock(&bus->cmd_mutex);
	60	return err;
	61	}
	62	EXPORT_SYMBOL_GPL(snd_hdac_bus_exec_verb);
	63
	64	/**
	65	* snd_hdac_bus_exec_verb_unlocked - unlocked version
	66	* @bus: bus object
	67	* @cmd: HD-audio encoded verb
	68	* @res: pointer to store the response, NULL if performing asynchronously
	69	*
	70	* Returns 0 if successful, or a negative error code.
	71	*/
	72	int snd_hdac_bus_exec_verb_unlocked(struct hdac_bus *bus, unsigned int addr,
	73	unsigned int cmd, unsigned int *res)
	74	{
75	unsigned int tmp;
76	int err;
77
78	if (cmd == ~0)
79	return -EINVAL;
80
81	if (res)
82	*res = -1;
83	else if (bus->sync_write)
84	res = &tmp;
85	for (;;) {
e311782a	86	trace_hda_send_cmd(bus, cmd);
d068ebc2 TI	87	err = bus->ops->command(bus, cmd);
	88	if (err != -EAGAIN)
	89	break;
	90	/* process pending verbs */
	91	err = bus->ops->get_response(bus, addr, &tmp);
	92	if (err)
	93	break;
	94	}
e311782a	95	if (!err && res) {
d068ebc2	96	err = bus->ops->get_response(bus, addr, res);
e311782a TI	97	trace_hda_get_response(bus, addr, *res);
e311782a TI	98	}
d068ebc2 TI	99	return err;
	100	}
	101	EXPORT_SYMBOL_GPL(snd_hdac_bus_exec_verb_unlocked);
	102
	103	/**
	104	* snd_hdac_bus_queue_event - add an unsolicited event to queue
	105	* @bus: the BUS
	106	* @res: unsolicited event (lower 32bit of RIRB entry)
	107	* @res_ex: codec addr and flags (upper 32bit or RIRB entry)
	108	*
	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.
	112	*/
	113	void snd_hdac_bus_queue_event(struct hdac_bus *bus, u32 res, u32 res_ex)
	114	{
	115	unsigned int wp;
	116
	117	if (!bus)
	118	return;
	119
e311782a	120	trace_hda_unsol_event(bus, res, res_ex);
d068ebc2 TI	121	wp = (bus->unsol_wp + 1) % HDA_UNSOL_QUEUE_SIZE;
	122	bus->unsol_wp = wp;
	123
	124	wp <<= 1;
	125	bus->unsol_queue[wp] = res;
	126	bus->unsol_queue[wp + 1] = res_ex;
	127
	128	schedule_work(&bus->unsol_work);
	129	}
	130	EXPORT_SYMBOL_GPL(snd_hdac_bus_queue_event);
	131
	132	/*
	133	* process queued unsolicited events
	134	*/
	135	static void process_unsol_events(struct work_struct *work)
	136	{
	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;
	141
	142	while (bus->unsol_rp != bus->unsol_wp) {
	143	rp = (bus->unsol_rp + 1) % HDA_UNSOL_QUEUE_SIZE;
	144	bus->unsol_rp = rp;
	145	rp <<= 1;
	146	res = bus->unsol_queue[rp];
	147	caddr = bus->unsol_queue[rp + 1];
	148	if (!(caddr & (1 << 4))) /* no unsolicited event? */
	149	continue;
	150	codec = bus->caddr_tbl[caddr & 0x0f];
	151	if (!codec \|\| !codec->dev.driver)
	152	continue;
	153	drv = drv_to_hdac_driver(codec->dev.driver);
	154	if (drv->unsol_event)
	155	drv->unsol_event(codec, res);
	156	}
	157	}
	158
	159	int snd_hdac_bus_add_device(struct hdac_bus bus, struct hdac_device codec)
	160	{
	161	if (bus->caddr_tbl[codec->addr]) {
	162	dev_err(bus->dev, "address 0x%x is already occupied\n",
	163	codec->addr);
	164	return -EBUSY;
	165	}
	166
	167	list_add_tail(&codec->list, &bus->codec_list);
	168	bus->caddr_tbl[codec->addr] = codec;
	169	set_bit(codec->addr, &bus->codec_powered);
	170	bus->num_codecs++;
	171	return 0;
	172	}
	173	EXPORT_SYMBOL_GPL(snd_hdac_bus_add_device);
	174
	175	void snd_hdac_bus_remove_device(struct hdac_bus *bus,
	176	struct hdac_device *codec)
	177	{
	178	WARN_ON(bus != codec->bus);
	179	if (list_empty(&codec->list))
	180	return;
	181	list_del_init(&codec->list);
	182	bus->caddr_tbl[codec->addr] = NULL;
	183	clear_bit(codec->addr, &bus->codec_powered);
	184	bus->num_codecs--;
185	}
186	EXPORT_SYMBOL_GPL(snd_hdac_bus_remove_device);