1. 根目录:
2. sound
3. hda
4. hdac_device.c

/*
 * HD-audio codec core device
 */

#include <linux/init.h>
#include <linux/device.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/export.h>
#include <linux/pm_runtime.h>
#include <sound/hdaudio.h>
#include <sound/hda_regmap.h>
#include "local.h"

static void setup_fg_nodes(struct hdac_device *codec);
static int get_codec_vendor_name(struct hdac_device *codec);

static void default_release(struct device *dev)
{
	snd_hdac_device_exit(container_of(dev, struct hdac_device, dev));
}

/**
 * snd_hdac_device_init - initialize the HD-audio codec base device
 * @codec: device to initialize
 * @bus: but to attach
 * @name: device name string
 * @addr: codec address
 *
 * Returns zero for success or a negative error code.
 *
 * This function increments the runtime PM counter and marks it active.
 * The caller needs to turn it off appropriately later.
 *
 * The caller needs to set the device's release op properly by itself.
 */
int snd_hdac_device_init(struct hdac_device *codec, struct hdac_bus *bus,
			 const char *name, unsigned int addr)
{
	struct device *dev;
	hda_nid_t fg;
	int err;

	dev = &codec->dev;
	device_initialize(dev);
	dev->parent = bus->dev;
	dev->bus = &snd_hda_bus_type;
	dev->release = default_release;
	dev->groups = hdac_dev_attr_groups;
	dev_set_name(dev, "%s", name);
	device_enable_async_suspend(dev);

	codec->bus = bus;
	codec->addr = addr;
	codec->type = HDA_DEV_CORE;
	pm_runtime_set_active(&codec->dev);
	pm_runtime_get_noresume(&codec->dev);
	atomic_set(&codec->in_pm, 0);

	err = snd_hdac_bus_add_device(bus, codec);
	if (err < 0)
		goto error;

	/* fill parameters */
	codec->vendor_id = snd_hdac_read_parm(codec, AC_NODE_ROOT,
					      AC_PAR_VENDOR_ID);
	if (codec->vendor_id == -1) {
		/* read again, hopefully the access method was corrected
		 * in the last read...
		 */
		codec->vendor_id = snd_hdac_read_parm(codec, AC_NODE_ROOT,
						      AC_PAR_VENDOR_ID);
	}

	codec->subsystem_id = snd_hdac_read_parm(codec, AC_NODE_ROOT,
						 AC_PAR_SUBSYSTEM_ID);
	codec->revision_id = snd_hdac_read_parm(codec, AC_NODE_ROOT,
						AC_PAR_REV_ID);

	setup_fg_nodes(codec);
	if (!codec->afg && !codec->mfg) {
		dev_err(dev, "no AFG or MFG node found\n");
		err = -ENODEV;
		goto error;
	}

	fg = codec->afg ? codec->afg : codec->mfg;

	err = snd_hdac_refresh_widgets(codec);
	if (err < 0)
		goto error;

	codec->power_caps = snd_hdac_read_parm(codec, fg, AC_PAR_POWER_STATE);
	/* reread ssid if not set by parameter */
	if (codec->subsystem_id == -1 || codec->subsystem_id == 0)
		snd_hdac_read(codec, fg, AC_VERB_GET_SUBSYSTEM_ID, 0,
			      &codec->subsystem_id);

	err = get_codec_vendor_name(codec);
	if (err < 0)
		goto error;

	codec->chip_name = kasprintf(GFP_KERNEL, "ID %x",
				     codec->vendor_id & 0xffff);
	if (!codec->chip_name) {
		err = -ENOMEM;
		goto error;
	}

	return 0;

 error:
	put_device(&codec->dev);
	return err;
}
EXPORT_SYMBOL_GPL(snd_hdac_device_init);

/**
 * snd_hdac_device_exit - clean up the HD-audio codec base device
 * @codec: device to clean up
 */
void snd_hdac_device_exit(struct hdac_device *codec)
{
	pm_runtime_put_noidle(&codec->dev);
	snd_hdac_bus_remove_device(codec->bus, codec);
	kfree(codec->vendor_name);
	kfree(codec->chip_name);
}
EXPORT_SYMBOL_GPL(snd_hdac_device_exit);

/**
 * snd_hdac_device_register - register the hd-audio codec base device
 * codec: the device to register
 */
int snd_hdac_device_register(struct hdac_device *codec)
{
	int err;

	err = device_add(&codec->dev);
	if (err < 0)
		return err;
	err = hda_widget_sysfs_init(codec);
	if (err < 0) {
		device_del(&codec->dev);
		return err;
	}

	return 0;
}
EXPORT_SYMBOL_GPL(snd_hdac_device_register);

/**
 * snd_hdac_device_unregister - unregister the hd-audio codec base device
 * codec: the device to unregister
 */
void snd_hdac_device_unregister(struct hdac_device *codec)
{
	if (device_is_registered(&codec->dev)) {
		hda_widget_sysfs_exit(codec);
		device_del(&codec->dev);
	}
}
EXPORT_SYMBOL_GPL(snd_hdac_device_unregister);

/**
 * snd_hdac_make_cmd - compose a 32bit command word to be sent to the
 *	HD-audio controller
 * @codec: the codec object
 * @nid: NID to encode
 * @verb: verb to encode
 * @parm: parameter to encode
 *
 * Return an encoded command verb or -1 for error.
 */
unsigned int snd_hdac_make_cmd(struct hdac_device *codec, hda_nid_t nid,
			       unsigned int verb, unsigned int parm)
{
	u32 val, addr;

	addr = codec->addr;
	if ((addr & ~0xf) || (nid & ~0x7f) ||
	    (verb & ~0xfff) || (parm & ~0xffff)) {
		dev_err(&codec->dev, "out of range cmd %x:%x:%x:%x\n",
			addr, nid, verb, parm);
		return -1;
	}

	val = addr << 28;
	val |= (u32)nid << 20;
	val |= verb << 8;
	val |= parm;
	return val;
}
EXPORT_SYMBOL_GPL(snd_hdac_make_cmd);

/**
 * snd_hdac_exec_verb - execute an encoded verb
 * @codec: the codec object
 * @cmd: encoded verb to execute
 * @flags: optional flags, pass zero for default
 * @res: the pointer to store the result, NULL if running async
 *
 * Returns zero if successful, or a negative error code.
 *
 * This calls the exec_verb op when set in hdac_codec.  If not,
 * call the default snd_hdac_bus_exec_verb().
 */
int snd_hdac_exec_verb(struct hdac_device *codec, unsigned int cmd,
		       unsigned int flags, unsigned int *res)
{
	if (codec->exec_verb)
		return codec->exec_verb(codec, cmd, flags, res);
	return snd_hdac_bus_exec_verb(codec->bus, codec->addr, cmd, res);
}
EXPORT_SYMBOL_GPL(snd_hdac_exec_verb);


/**
 * snd_hdac_read - execute a verb
 * @codec: the codec object
 * @nid: NID to execute a verb
 * @verb: verb to execute
 * @parm: parameter for a verb
 * @res: the pointer to store the result, NULL if running async
 *
 * Returns zero if successful, or a negative error code.
 */
int snd_hdac_read(struct hdac_device *codec, hda_nid_t nid,
		  unsigned int verb, unsigned int parm, unsigned int *res)
{
	unsigned int cmd = snd_hdac_make_cmd(codec, nid, verb, parm);

	return snd_hdac_exec_verb(codec, cmd, 0, res);
}
EXPORT_SYMBOL_GPL(snd_hdac_read);

/**
 * _snd_hdac_read_parm - read a parmeter
 *
 * This function returns zero or an error unlike snd_hdac_read_parm().
 */
int _snd_hdac_read_parm(struct hdac_device *codec, hda_nid_t nid, int parm,
			unsigned int *res)
{
	unsigned int cmd;

	cmd = snd_hdac_regmap_encode_verb(nid, AC_VERB_PARAMETERS) | parm;
	return snd_hdac_regmap_read_raw(codec, cmd, res);
}
EXPORT_SYMBOL_GPL(_snd_hdac_read_parm);

/**
 * snd_hdac_read_parm_uncached - read a codec parameter without caching
 * @codec: the codec object
 * @nid: NID to read a parameter
 * @parm: parameter to read
 *
 * Returns -1 for error.  If you need to distinguish the error more
 * strictly, use snd_hdac_read() directly.
 */
int snd_hdac_read_parm_uncached(struct hdac_device *codec, hda_nid_t nid,
				int parm)
{
	int val;

	if (codec->regmap)
		regcache_cache_bypass(codec->regmap, true);
	val = snd_hdac_read_parm(codec, nid, parm);
	if (codec->regmap)
		regcache_cache_bypass(codec->regmap, false);
	return val;
}
EXPORT_SYMBOL_GPL(snd_hdac_read_parm_uncached);

/**
 * snd_hdac_override_parm - override read-only parameters
 * @codec: the codec object
 * @nid: NID for the parameter
 * @parm: the parameter to change
 * @val: the parameter value to overwrite
 */
int snd_hdac_override_parm(struct hdac_device *codec, hda_nid_t nid,
			   unsigned int parm, unsigned int val)
{
	unsigned int verb = (AC_VERB_PARAMETERS << 8) | (nid << 20) | parm;
	int err;

	if (!codec->regmap)
		return -EINVAL;

	codec->caps_overwriting = true;
	err = snd_hdac_regmap_write_raw(codec, verb, val);
	codec->caps_overwriting = false;
	return err;
}
EXPORT_SYMBOL_GPL(snd_hdac_override_parm);

/**
 * snd_hdac_get_sub_nodes - get start NID and number of subtree nodes
 * @codec: the codec object
 * @nid: NID to inspect
 * @start_id: the pointer to store the starting NID
 *
 * Returns the number of subtree nodes or zero if not found.
 * This function reads parameters always without caching.
 */
int snd_hdac_get_sub_nodes(struct hdac_device *codec, hda_nid_t nid,
			   hda_nid_t *start_id)
{
	unsigned int parm;

	parm = snd_hdac_read_parm_uncached(codec, nid, AC_PAR_NODE_COUNT);
	if (parm == -1) {
		*start_id = 0;
		return 0;
	}
	*start_id = (parm >> 16) & 0x7fff;
	return (int)(parm & 0x7fff);
}
EXPORT_SYMBOL_GPL(snd_hdac_get_sub_nodes);

/*
 * look for an AFG and MFG nodes
 */
static void setup_fg_nodes(struct hdac_device *codec)
{
	int i, total_nodes, function_id;
	hda_nid_t nid;

	total_nodes = snd_hdac_get_sub_nodes(codec, AC_NODE_ROOT, &nid);
	for (i = 0; i < total_nodes; i++, nid++) {
		function_id = snd_hdac_read_parm(codec, nid,
						 AC_PAR_FUNCTION_TYPE);
		switch (function_id & 0xff) {
		case AC_GRP_AUDIO_FUNCTION:
			codec->afg = nid;
			codec->afg_function_id = function_id & 0xff;
			codec->afg_unsol = (function_id >> 8) & 1;
			break;
		case AC_GRP_MODEM_FUNCTION:
			codec->mfg = nid;
			codec->mfg_function_id = function_id & 0xff;
			codec->mfg_unsol = (function_id >> 8) & 1;
			break;
		default:
			break;
		}
	}
}

/**
 * snd_hdac_refresh_widgets - Reset the widget start/end nodes
 * @codec: the codec object
 */
int snd_hdac_refresh_widgets(struct hdac_device *codec)
{
	hda_nid_t start_nid;
	int nums;

	nums = snd_hdac_get_sub_nodes(codec, codec->afg, &start_nid);
	if (!start_nid || nums <= 0 || nums >= 0xff) {
		dev_err(&codec->dev, "cannot read sub nodes for FG 0x%02x\n",
			codec->afg);
		return -EINVAL;
	}

	codec->num_nodes = nums;
	codec->start_nid = start_nid;
	codec->end_nid = start_nid + nums;
	return 0;
}
EXPORT_SYMBOL_GPL(snd_hdac_refresh_widgets);

/* return CONNLIST_LEN parameter of the given widget */
static unsigned int get_num_conns(struct hdac_device *codec, hda_nid_t nid)
{
	unsigned int wcaps = get_wcaps(codec, nid);
	unsigned int parm;

	if (!(wcaps & AC_WCAP_CONN_LIST) &&
	    get_wcaps_type(wcaps) != AC_WID_VOL_KNB)
		return 0;

	parm = snd_hdac_read_parm(codec, nid, AC_PAR_CONNLIST_LEN);
	if (parm == -1)
		parm = 0;
	return parm;
}

/**
 * snd_hdac_get_connections - get a widget connection list
 * @codec: the codec object
 * @nid: NID
 * @conn_list: the array to store the results, can be NULL
 * @max_conns: the max size of the given array
 *
 * Returns the number of connected widgets, zero for no connection, or a
 * negative error code.  When the number of elements don't fit with the
 * given array size, it returns -ENOSPC.
 *
 * When @conn_list is NULL, it just checks the number of connections.
 */
int snd_hdac_get_connections(struct hdac_device *codec, hda_nid_t nid,
			     hda_nid_t *conn_list, int max_conns)
{
	unsigned int parm;
	int i, conn_len, conns, err;
	unsigned int shift, num_elems, mask;
	hda_nid_t prev_nid;
	int null_count = 0;

	parm = get_num_conns(codec, nid);
	if (!parm)
		return 0;

	if (parm & AC_CLIST_LONG) {
		/* long form */
		shift = 16;
		num_elems = 2;
	} else {
		/* short form */
		shift = 8;
		num_elems = 4;
	}
	conn_len = parm & AC_CLIST_LENGTH;
	mask = (1 << (shift-1)) - 1;

	if (!conn_len)
		return 0; /* no connection */

	if (conn_len == 1) {
		/* single connection */
		err = snd_hdac_read(codec, nid, AC_VERB_GET_CONNECT_LIST, 0,
				    &parm);
		if (err < 0)
			return err;
		if (conn_list)
			conn_list[0] = parm & mask;
		return 1;
	}

	/* multi connection */
	conns = 0;
	prev_nid = 0;
	for (i = 0; i < conn_len; i++) {
		int range_val;
		hda_nid_t val, n;

		if (i % num_elems == 0) {
			err = snd_hdac_read(codec, nid,
					    AC_VERB_GET_CONNECT_LIST, i,
					    &parm);
			if (err < 0)
				return -EIO;
		}
		range_val = !!(parm & (1 << (shift-1))); /* ranges */
		val = parm & mask;
		if (val == 0 && null_count++) {  /* no second chance */
			dev_dbg(&codec->dev,
				"invalid CONNECT_LIST verb %x[%i]:%x\n",
				nid, i, parm);
			return 0;
		}
		parm >>= shift;
		if (range_val) {
			/* ranges between the previous and this one */
			if (!prev_nid || prev_nid >= val) {
				dev_warn(&codec->dev,
					 "invalid dep_range_val %x:%x\n",
					 prev_nid, val);
				continue;
			}
			for (n = prev_nid + 1; n <= val; n++) {
				if (conn_list) {
					if (conns >= max_conns)
						return -ENOSPC;
					conn_list[conns] = n;
				}
				conns++;
			}
		} else {
			if (conn_list) {
				if (conns >= max_conns)
					return -ENOSPC;
				conn_list[conns] = val;
			}
			conns++;
		}
		prev_nid = val;
	}
	return conns;
}
EXPORT_SYMBOL_GPL(snd_hdac_get_connections);

#ifdef CONFIG_PM
/**
 * snd_hdac_power_up - power up the codec
 * @codec: the codec object
 *
 * This function calls the runtime PM helper to power up the given codec.
 * Unlike snd_hdac_power_up_pm(), you should call this only for the code
 * path that isn't included in PM path.  Otherwise it gets stuck.
 */
void snd_hdac_power_up(struct hdac_device *codec)
{
	pm_runtime_get_sync(&codec->dev);
}
EXPORT_SYMBOL_GPL(snd_hdac_power_up);

/**
 * snd_hdac_power_down - power down the codec
 * @codec: the codec object
 */
void snd_hdac_power_down(struct hdac_device *codec)
{
	struct device *dev = &codec->dev;

	pm_runtime_mark_last_busy(dev);
	pm_runtime_put_autosuspend(dev);
}
EXPORT_SYMBOL_GPL(snd_hdac_power_down);

/**
 * snd_hdac_power_up_pm - power up the codec
 * @codec: the codec object
 *
 * This function can be called in a recursive code path like init code
 * which may be called by PM suspend/resume again.  OTOH, if a power-up
 * call must wake up the sleeper (e.g. in a kctl callback), use
 * snd_hdac_power_up() instead.
 */
void snd_hdac_power_up_pm(struct hdac_device *codec)
{
	if (!atomic_inc_not_zero(&codec->in_pm))
		snd_hdac_power_up(codec);
}
EXPORT_SYMBOL_GPL(snd_hdac_power_up_pm);

/**
 * snd_hdac_power_down_pm - power down the codec
 * @codec: the codec object
 *
 * Like snd_hdac_power_up_pm(), this function is used in a recursive
 * code path like init code which may be called by PM suspend/resume again.
 */
void snd_hdac_power_down_pm(struct hdac_device *codec)
{
	if (atomic_dec_if_positive(&codec->in_pm) < 0)
		snd_hdac_power_down(codec);
}
EXPORT_SYMBOL_GPL(snd_hdac_power_down_pm);
#endif

/* codec vendor labels */
struct hda_vendor_id {
	unsigned int id;
	const char *name;
};

static struct hda_vendor_id hda_vendor_ids[] = {
	{ 0x1002, "ATI" },
	{ 0x1013, "Cirrus Logic" },
	{ 0x1057, "Motorola" },
	{ 0x1095, "Silicon Image" },
	{ 0x10de, "Nvidia" },
	{ 0x10ec, "Realtek" },
	{ 0x1102, "Creative" },
	{ 0x1106, "VIA" },
	{ 0x111d, "IDT" },
	{ 0x11c1, "LSI" },
	{ 0x11d4, "Analog Devices" },
	{ 0x13f6, "C-Media" },
	{ 0x14f1, "Conexant" },
	{ 0x17e8, "Chrontel" },
	{ 0x1854, "LG" },
	{ 0x1aec, "Wolfson Microelectronics" },
	{ 0x1af4, "QEMU" },
	{ 0x434d, "C-Media" },
	{ 0x8086, "Intel" },
	{ 0x8384, "SigmaTel" },
	{} /* terminator */
};

/* store the codec vendor name */
static int get_codec_vendor_name(struct hdac_device *codec)
{
	const struct hda_vendor_id *c;
	u16 vendor_id = codec->vendor_id >> 16;

	for (c = hda_vendor_ids; c->id; c++) {
		if (c->id == vendor_id) {
			codec->vendor_name = kstrdup(c->name, GFP_KERNEL);
			return codec->vendor_name ? 0 : -ENOMEM;
		}
	}

	codec->vendor_name = kasprintf(GFP_KERNEL, "Generic %04x", vendor_id);
	return codec->vendor_name ? 0 : -ENOMEM;
}