hda_codec.c

/*
 * Universal Interface for Intel High Definition Audio Codec
 *
 * Copyright (c) 2004 Takashi Iwai <tiwai@suse.de>
 *
 *
 *  This driver is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This driver is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 */

#include <linux/init.h>
#include <linux/delay.h>
#include <linux/slab.h>
#include <linux/pci.h>
#include <linux/mutex.h>
#include <sound/core.h>
#include "hda_codec.h"
#include <sound/asoundef.h>
#include <sound/tlv.h>
#include <sound/initval.h>
#include <sound/jack.h>
#include "hda_local.h"
#include "hda_beep.h"
#include <sound/hda_hwdep.h>

/*
 * vendor / preset table
 */

struct hda_vendor_id {
	unsigned int id;
	const char *name;
};

/* codec vendor labels */
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" },
	{ 0x434d, "C-Media" },
	{ 0x8086, "Intel" },
	{ 0x8384, "SigmaTel" },
	{} /* terminator */
};

static DEFINE_MUTEX(preset_mutex);
static LIST_HEAD(hda_preset_tables);

int snd_hda_add_codec_preset(struct hda_codec_preset_list *preset)
{
	mutex_lock(&preset_mutex);
	list_add_tail(&preset->list, &hda_preset_tables);
	mutex_unlock(&preset_mutex);
	return 0;
}
EXPORT_SYMBOL_HDA(snd_hda_add_codec_preset);

int snd_hda_delete_codec_preset(struct hda_codec_preset_list *preset)
{
	mutex_lock(&preset_mutex);
	list_del(&preset->list);
	mutex_unlock(&preset_mutex);
	return 0;
}
EXPORT_SYMBOL_HDA(snd_hda_delete_codec_preset);

#ifdef CONFIG_SND_HDA_POWER_SAVE
static void hda_power_work(struct work_struct *work);
static void hda_keep_power_on(struct hda_codec *codec);
#else
static inline void hda_keep_power_on(struct hda_codec *codec) {}
#endif

/**
 * snd_hda_get_jack_location - Give a location string of the jack
 * @cfg: pin default config value
 *
 * Parse the pin default config value and returns the string of the
 * jack location, e.g. "Rear", "Front", etc.
 */
const char *snd_hda_get_jack_location(u32 cfg)
{
	static char *bases[7] = {
		"N/A", "Rear", "Front", "Left", "Right", "Top", "Bottom",
	};
	static unsigned char specials_idx[] = {
		0x07, 0x08,
		0x17, 0x18, 0x19,
		0x37, 0x38
	};
	static char *specials[] = {
		"Rear Panel", "Drive Bar",
		"Riser", "HDMI", "ATAPI",
		"Mobile-In", "Mobile-Out"
	};
	int i;
	cfg = (cfg & AC_DEFCFG_LOCATION) >> AC_DEFCFG_LOCATION_SHIFT;
	if ((cfg & 0x0f) < 7)
		return bases[cfg & 0x0f];
	for (i = 0; i < ARRAY_SIZE(specials_idx); i++) {
		if (cfg == specials_idx[i])
			return specials[i];
	}
	return "UNKNOWN";
}
EXPORT_SYMBOL_HDA(snd_hda_get_jack_location);

/**
 * snd_hda_get_jack_connectivity - Give a connectivity string of the jack
 * @cfg: pin default config value
 *
 * Parse the pin default config value and returns the string of the
 * jack connectivity, i.e. external or internal connection.
 */
const char *snd_hda_get_jack_connectivity(u32 cfg)
{
	static char *jack_locations[4] = { "Ext", "Int", "Sep", "Oth" };

	return jack_locations[(cfg >> (AC_DEFCFG_LOCATION_SHIFT + 4)) & 3];
}
EXPORT_SYMBOL_HDA(snd_hda_get_jack_connectivity);

/**
 * snd_hda_get_jack_type - Give a type string of the jack
 * @cfg: pin default config value
 *
 * Parse the pin default config value and returns the string of the
 * jack type, i.e. the purpose of the jack, such as Line-Out or CD.
 */
const char *snd_hda_get_jack_type(u32 cfg)
{
	static char *jack_types[16] = {
		"Line Out", "Speaker", "HP Out", "CD",
		"SPDIF Out", "Digital Out", "Modem Line", "Modem Hand",
		"Line In", "Aux", "Mic", "Telephony",
		"SPDIF In", "Digitial In", "Reserved", "Other"
	};

	return jack_types[(cfg & AC_DEFCFG_DEVICE)
				>> AC_DEFCFG_DEVICE_SHIFT];
}
EXPORT_SYMBOL_HDA(snd_hda_get_jack_type);

/*
 * Compose a 32bit command word to be sent to the HD-audio controller
 */
static inline unsigned int
make_codec_cmd(struct hda_codec *codec, hda_nid_t nid, int direct,
	       unsigned int verb, unsigned int parm)
{
	u32 val;

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

	val = (u32)codec->addr << 28;
	val |= (u32)direct << 27;
	val |= (u32)nid << 20;
	val |= verb << 8;
	val |= parm;
	return val;
}

/*
 * Send and receive a verb
 */
static int codec_exec_verb(struct hda_codec *codec, unsigned int cmd,
			   unsigned int *res)
{
	struct hda_bus *bus = codec->bus;
	int err;

	if (cmd == ~0)
		return -1;

	if (res)
		*res = -1;
 again:
	snd_hda_power_up(codec);
	mutex_lock(&bus->cmd_mutex);
	err = bus->ops.command(bus, cmd);
	if (!err && res)
		*res = bus->ops.get_response(bus, codec->addr);
	mutex_unlock(&bus->cmd_mutex);
	snd_hda_power_down(codec);
	if (res && *res == -1 && bus->rirb_error) {
		if (bus->response_reset) {
			snd_printd("hda_codec: resetting BUS due to "
				   "fatal communication error\n");
			bus->ops.bus_reset(bus);
		}
		goto again;
	}
	/* clear reset-flag when the communication gets recovered */
	if (!err)
		bus->response_reset = 0;
	return err;
}

/**
 * snd_hda_codec_read - send a command and get the response
 * @codec: the HDA codec
 * @nid: NID to send the command
 * @direct: direct flag
 * @verb: the verb to send
 * @parm: the parameter for the verb
 *
 * Send a single command and read the corresponding response.
 *
 * Returns the obtained response value, or -1 for an error.
 */
unsigned int snd_hda_codec_read(struct hda_codec *codec, hda_nid_t nid,
				int direct,
				unsigned int verb, unsigned int parm)
{
	unsigned cmd = make_codec_cmd(codec, nid, direct, verb, parm);
	unsigned int res;
	codec_exec_verb(codec, cmd, &res);
	return res;
}
EXPORT_SYMBOL_HDA(snd_hda_codec_read);

/**
 * snd_hda_codec_write - send a single command without waiting for response
 * @codec: the HDA codec
 * @nid: NID to send the command
 * @direct: direct flag
 * @verb: the verb to send
 * @parm: the parameter for the verb
 *
 * Send a single command without waiting for response.
 *
 * Returns 0 if successful, or a negative error code.
 */
int snd_hda_codec_write(struct hda_codec *codec, hda_nid_t nid, int direct,
			 unsigned int verb, unsigned int parm)
{
	unsigned int cmd = make_codec_cmd(codec, nid, direct, verb, parm);
	unsigned int res;
	return codec_exec_verb(codec, cmd,
			       codec->bus->sync_write ? &res : NULL);
}
EXPORT_SYMBOL_HDA(snd_hda_codec_write);

/**
 * snd_hda_sequence_write - sequence writes
 * @codec: the HDA codec
 * @seq: VERB array to send
 *
 * Send the commands sequentially from the given array.
 * The array must be terminated with NID=0.
 */
void snd_hda_sequence_write(struct hda_codec *codec, const struct hda_verb *seq)
{
	for (; seq->nid; seq++)
		snd_hda_codec_write(codec, seq->nid, 0, seq->verb, seq->param);
}
EXPORT_SYMBOL_HDA(snd_hda_sequence_write);

/**
 * snd_hda_get_sub_nodes - get the range of sub nodes
 * @codec: the HDA codec
 * @nid: NID to parse
 * @start_id: the pointer to store the start NID
 *
 * Parse the NID and store the start NID of its sub-nodes.
 * Returns the number of sub-nodes.
 */
int snd_hda_get_sub_nodes(struct hda_codec *codec, hda_nid_t nid,
			  hda_nid_t *start_id)
{
	unsigned int parm;

	parm = snd_hda_param_read(codec, nid, AC_PAR_NODE_COUNT);
	if (parm == -1)
		return 0;
	*start_id = (parm >> 16) & 0x7fff;
	return (int)(parm & 0x7fff);
}
EXPORT_SYMBOL_HDA(snd_hda_get_sub_nodes);

static int _hda_get_connections(struct hda_codec *codec, hda_nid_t nid,
				hda_nid_t *conn_list, int max_conns);
static bool add_conn_list(struct snd_array *array, hda_nid_t nid);
static int copy_conn_list(hda_nid_t nid, hda_nid_t *dst, int max_dst,
			  hda_nid_t *src, int len);

/**
 * snd_hda_get_connections - get connection list
 * @codec: the HDA codec
 * @nid: NID to parse
 * @conn_list: connection list array
 * @max_conns: max. number of connections to store
 *
 * Parses the connection list of the given widget and stores the list
 * of NIDs.
 *
 * Returns the number of connections, or a negative error code.
 */
int snd_hda_get_connections(struct hda_codec *codec, hda_nid_t nid,
			     hda_nid_t *conn_list, int max_conns)
{
	struct snd_array *array = &codec->conn_lists;
	int i, len, old_used;
	hda_nid_t list[HDA_MAX_CONNECTIONS];

	/* look up the cached results */
	for (i = 0; i < array->used; ) {
		hda_nid_t *p = snd_array_elem(array, i);
		len = p[1];
		if (nid == *p)
			return copy_conn_list(nid, conn_list, max_conns,
					      p + 2, len);
		i += len + 2;
	}

	len = _hda_get_connections(codec, nid, list, HDA_MAX_CONNECTIONS);
	if (len < 0)
		return len;

	/* add to the cache */
	old_used = array->used;
	if (!add_conn_list(array, nid) || !add_conn_list(array, len))
		goto error_add;
	for (i = 0; i < len; i++)
		if (!add_conn_list(array, list[i]))
			goto error_add;

	return copy_conn_list(nid, conn_list, max_conns, list, len);
		
 error_add:
	array->used = old_used;
	return -ENOMEM;
}
EXPORT_SYMBOL_HDA(snd_hda_get_connections);

static int _hda_get_connections(struct hda_codec *codec, hda_nid_t nid,
			     hda_nid_t *conn_list, int max_conns)
{
	unsigned int parm;
	int i, conn_len, conns;
	unsigned int shift, num_elems, mask;
	unsigned int wcaps;
	hda_nid_t prev_nid;

	if (snd_BUG_ON(!conn_list || max_conns <= 0))
		return -EINVAL;

	wcaps = get_wcaps(codec, nid);
	if (!(wcaps & AC_WCAP_CONN_LIST) &&
	    get_wcaps_type(wcaps) != AC_WID_VOL_KNB) {
		snd_printk(KERN_WARNING "hda_codec: "
			   "connection list not available for 0x%x\n", nid);
		return -EINVAL;
	}

	parm = snd_hda_param_read(codec, nid, AC_PAR_CONNLIST_LEN);
	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 */
		parm = snd_hda_codec_read(codec, nid, 0,
					  AC_VERB_GET_CONNECT_LIST, 0);
		if (parm == -1 && codec->bus->rirb_error)
			return -EIO;
		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) {
			parm = snd_hda_codec_read(codec, nid, 0,
						  AC_VERB_GET_CONNECT_LIST, i);
			if (parm == -1 && codec->bus->rirb_error)
				return -EIO;
		}
		range_val = !!(parm & (1 << (shift-1))); /* ranges */
		val = parm & mask;
		if (val == 0) {
			snd_printk(KERN_WARNING "hda_codec: "
				   "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) {
				snd_printk(KERN_WARNING "hda_codec: "
					   "invalid dep_range_val %x:%x\n",
					   prev_nid, val);
				continue;
			}
			for (n = prev_nid + 1; n <= val; n++) {
				if (conns >= max_conns) {
					snd_printk(KERN_ERR "hda_codec: "
						   "Too many connections %d for NID 0x%x\n",
						   conns, nid);
					return -EINVAL;
				}
				conn_list[conns++] = n;
			}
		} else {
			if (conns >= max_conns) {
				snd_printk(KERN_ERR "hda_codec: "
					   "Too many connections %d for NID 0x%x\n",
					   conns, nid);
				return -EINVAL;
			}
			conn_list[conns++] = val;
		}
		prev_nid = val;
	}
	return conns;
}

static bool add_conn_list(struct snd_array *array, hda_nid_t nid)
{
	hda_nid_t *p = snd_array_new(array);
	if (!p)
		return false;
	*p = nid;
	return true;
}

static int copy_conn_list(hda_nid_t nid, hda_nid_t *dst, int max_dst,
			  hda_nid_t *src, int len)
{
	if (len > max_dst) {
		snd_printk(KERN_ERR "hda_codec: "
			   "Too many connections %d for NID 0x%x\n",
			   len, nid);
		return -EINVAL;
	}
	memcpy(dst, src, len * sizeof(hda_nid_t));
	return len;
}

/**
 * snd_hda_queue_unsol_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.
 *
 * Returns 0 if successful, or a negative error code.
 */
int snd_hda_queue_unsol_event(struct hda_bus *bus, u32 res, u32 res_ex)
{
	struct hda_bus_unsolicited *unsol;
	unsigned int wp;

	unsol = bus->unsol;
	if (!unsol)
		return 0;

	wp = (unsol->wp + 1) % HDA_UNSOL_QUEUE_SIZE;
	unsol->wp = wp;

	wp <<= 1;
	unsol->queue[wp] = res;
	unsol->queue[wp + 1] = res_ex;

	queue_work(bus->workq, &unsol->work);

	return 0;
}
EXPORT_SYMBOL_HDA(snd_hda_queue_unsol_event);

/*
 * process queued unsolicited events
 */
static void process_unsol_events(struct work_struct *work)
{
	struct hda_bus_unsolicited *unsol =
		container_of(work, struct hda_bus_unsolicited, work);
	struct hda_bus *bus = unsol->bus;
	struct hda_codec *codec;
	unsigned int rp, caddr, res;

	while (unsol->rp != unsol->wp) {
		rp = (unsol->rp + 1) % HDA_UNSOL_QUEUE_SIZE;
		unsol->rp = rp;
		rp <<= 1;
		res = unsol->queue[rp];
		caddr = unsol->queue[rp + 1];
		if (!(caddr & (1 << 4))) /* no unsolicited event? */
			continue;
		codec = bus->caddr_tbl[caddr & 0x0f];
		if (codec && codec->patch_ops.unsol_event)
			codec->patch_ops.unsol_event(codec, res);
	}
}

/*
 * initialize unsolicited queue
 */
static int init_unsol_queue(struct hda_bus *bus)
{
	struct hda_bus_unsolicited *unsol;

	if (bus->unsol) /* already initialized */
		return 0;

	unsol = kzalloc(sizeof(*unsol), GFP_KERNEL);
	if (!unsol) {
		snd_printk(KERN_ERR "hda_codec: "
			   "can't allocate unsolicited queue\n");
		return -ENOMEM;
	}
	INIT_WORK(&unsol->work, process_unsol_events);
	unsol->bus = bus;
	bus->unsol = unsol;
	return 0;
}

/*
 * destructor
 */
static void snd_hda_codec_free(struct hda_codec *codec);

static int snd_hda_bus_free(struct hda_bus *bus)
{
	struct hda_codec *codec, *n;

	if (!bus)
		return 0;
	if (bus->workq)
		flush_workqueue(bus->workq);
	if (bus->unsol)
		kfree(bus->unsol);
	list_for_each_entry_safe(codec, n, &bus->codec_list, list) {
		snd_hda_codec_free(codec);
	}
	if (bus->ops.private_free)
		bus->ops.private_free(bus);
	if (bus->workq)
		destroy_workqueue(bus->workq);
	kfree(bus);
	return 0;
}

static int snd_hda_bus_dev_free(struct snd_device *device)
{
	struct hda_bus *bus = device->device_data;
	bus->shutdown = 1;
	return snd_hda_bus_free(bus);
}

#ifdef CONFIG_SND_HDA_HWDEP
static int snd_hda_bus_dev_register(struct snd_device *device)
{
	struct hda_bus *bus = device->device_data;
	struct hda_codec *codec;
	list_for_each_entry(codec, &bus->codec_list, list) {
		snd_hda_hwdep_add_sysfs(codec);
		snd_hda_hwdep_add_power_sysfs(codec);
	}
	return 0;
}
#else
#define snd_hda_bus_dev_register	NULL
#endif

/**
 * snd_hda_bus_new - create a HDA bus
 * @card: the card entry
 * @temp: the template for hda_bus information
 * @busp: the pointer to store the created bus instance
 *
 * Returns 0 if successful, or a negative error code.
 */
int /*__devinit*/ snd_hda_bus_new(struct snd_card *card,
			      const struct hda_bus_template *temp,
			      struct hda_bus **busp)
{
	struct hda_bus *bus;
	int err;
	static struct snd_device_ops dev_ops = {
		.dev_register = snd_hda_bus_dev_register,
		.dev_free = snd_hda_bus_dev_free,
	};

	if (snd_BUG_ON(!temp))
		return -EINVAL;
	if (snd_BUG_ON(!temp->ops.command || !temp->ops.get_response))
		return -EINVAL;

	if (busp)
		*busp = NULL;

	bus = kzalloc(sizeof(*bus), GFP_KERNEL);
	if (bus == NULL) {
		snd_printk(KERN_ERR "can't allocate struct hda_bus\n");
		return -ENOMEM;
	}

	bus->card = card;
	bus->private_data = temp->private_data;
	bus->pci = temp->pci;
	bus->modelname = temp->modelname;
	bus->power_save = temp->power_save;
	bus->ops = temp->ops;

	mutex_init(&bus->cmd_mutex);
	mutex_init(&bus->prepare_mutex);
	INIT_LIST_HEAD(&bus->codec_list);

	snprintf(bus->workq_name, sizeof(bus->workq_name),
		 "hd-audio%d", card->number);
	bus->workq = create_singlethread_workqueue(bus->workq_name);
	if (!bus->workq) {
		snd_printk(KERN_ERR "cannot create workqueue %s\n",
			   bus->workq_name);
		kfree(bus);
		return -ENOMEM;
	}

	err = snd_device_new(card, SNDRV_DEV_BUS, bus, &dev_ops);
	if (err < 0) {
		snd_hda_bus_free(bus);
		return err;
	}
	if (busp)
		*busp = bus;
	return 0;
}
EXPORT_SYMBOL_HDA(snd_hda_bus_new);

#ifdef CONFIG_SND_HDA_GENERIC
#define is_generic_config(codec) \
	(codec->modelname && !strcmp(codec->modelname, "generic"))
#else
#define is_generic_config(codec)	0
#endif

#ifdef MODULE
#define HDA_MODREQ_MAX_COUNT	2	/* two request_modules()'s */
#else
#define HDA_MODREQ_MAX_COUNT	0	/* all presets are statically linked */
#endif

/*
 * find a matching codec preset
 */
static const struct hda_codec_preset *
find_codec_preset(struct hda_codec *codec)
{
	struct hda_codec_preset_list *tbl;
	const struct hda_codec_preset *preset;
	int mod_requested = 0;

	if (is_generic_config(codec))
		return NULL; /* use the generic parser */

 again:
	mutex_lock(&preset_mutex);
	list_for_each_entry(tbl, &hda_preset_tables, list) {
		if (!try_module_get(tbl->owner)) {
			snd_printk(KERN_ERR "hda_codec: cannot module_get\n");
			continue;
		}
		for (preset = tbl->preset; preset->id; preset++) {
			u32 mask = preset->mask;
			if (preset->afg && preset->afg != codec->afg)
				continue;
			if (preset->mfg && preset->mfg != codec->mfg)
				continue;
			if (!mask)
				mask = ~0;
			if (preset->id == (codec->vendor_id & mask) &&
			    (!preset->rev ||
			     preset->rev == codec->revision_id)) {
				mutex_unlock(&preset_mutex);
				codec->owner = tbl->owner;
				return preset;
			}
		}
		module_put(tbl->owner);
	}
	mutex_unlock(&preset_mutex);

	if (mod_requested < HDA_MODREQ_MAX_COUNT) {
		char name[32];
		if (!mod_requested)
			snprintf(name, sizeof(name), "snd-hda-codec-id:%08x",
				 codec->vendor_id);
		else
			snprintf(name, sizeof(name), "snd-hda-codec-id:%04x*",
				 (codec->vendor_id >> 16) & 0xffff);
		request_module(name);
		mod_requested++;
		goto again;
	}
	return NULL;
}

/*
 * get_codec_name - store the codec name
 */
static int get_codec_name(struct hda_codec *codec)
{
	const struct hda_vendor_id *c;
	const char *vendor = NULL;
	u16 vendor_id = codec->vendor_id >> 16;
	char tmp[16];

	if (codec->vendor_name)
		goto get_chip_name;

	for (c = hda_vendor_ids; c->id; c++) {
		if (c->id == vendor_id) {
			vendor = c->name;
			break;
		}
	}
	if (!vendor) {
		sprintf(tmp, "Generic %04x", vendor_id);
		vendor = tmp;
	}
	codec->vendor_name = kstrdup(vendor, GFP_KERNEL);
	if (!codec->vendor_name)
		return -ENOMEM;

 get_chip_name:
	if (codec->chip_name)
		return 0;

	if (codec->preset && codec->preset->name)
		codec->chip_name = kstrdup(codec->preset->name, GFP_KERNEL);
	else {
		sprintf(tmp, "ID %x", codec->vendor_id & 0xffff);
		codec->chip_name = kstrdup(tmp, GFP_KERNEL);
	}
	if (!codec->chip_name)
		return -ENOMEM;
	return 0;
}

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

	total_nodes = snd_hda_get_sub_nodes(codec, AC_NODE_ROOT, &nid);
	for (i = 0; i < total_nodes; i++, nid++) {
		function_id = snd_hda_param_read(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;
		}
	}
}

/*
 * read widget caps for each widget and store in cache
 */
static int read_widget_caps(struct hda_codec *codec, hda_nid_t fg_node)
{
	int i;
	hda_nid_t nid;

	codec->num_nodes = snd_hda_get_sub_nodes(codec, fg_node,
						 &codec->start_nid);
	codec->wcaps = kmalloc(codec->num_nodes * 4, GFP_KERNEL);
	if (!codec->wcaps)
		return -ENOMEM;
	nid = codec->start_nid;
	for (i = 0; i < codec->num_nodes; i++, nid++)
		codec->wcaps[i] = snd_hda_param_read(codec, nid,
						     AC_PAR_AUDIO_WIDGET_CAP);
	return 0;
}

/* read all pin default configurations and save codec->init_pins */
static int read_pin_defaults(struct hda_codec *codec)
{
	int i;
	hda_nid_t nid = codec->start_nid;

	for (i = 0; i < codec->num_nodes; i++, nid++) {
		struct hda_pincfg *pin;
		unsigned int wcaps = get_wcaps(codec, nid);
		unsigned int wid_type = get_wcaps_type(wcaps);
		if (wid_type != AC_WID_PIN)
			continue;
		pin = snd_array_new(&codec->init_pins);
		if (!pin)
			return -ENOMEM;
		pin->nid = nid;
		pin->cfg = snd_hda_codec_read(codec, nid, 0,
					      AC_VERB_GET_CONFIG_DEFAULT, 0);
		pin->ctrl = snd_hda_codec_read(codec, nid, 0,
					       AC_VERB_GET_PIN_WIDGET_CONTROL,
					       0);
	}
	return 0;
}

/* look up the given pin config list and return the item matching with NID */
static struct hda_pincfg *look_up_pincfg(struct hda_codec *codec,
					 struct snd_array *array,
					 hda_nid_t nid)
{
	int i;
	for (i = 0; i < array->used; i++) {
		struct hda_pincfg *pin = snd_array_elem(array, i);
		if (pin->nid == nid)
			return pin;
	}
	return NULL;
}

/* write a config value for the given NID */
static void set_pincfg(struct hda_codec *codec, hda_nid_t nid,
		       unsigned int cfg)
{
	int i;
	for (i = 0; i < 4; i++) {
		snd_hda_codec_write(codec, nid, 0,
				    AC_VERB_SET_CONFIG_DEFAULT_BYTES_0 + i,
				    cfg & 0xff);
		cfg >>= 8;
	}
}

/* set the current pin config value for the given NID.
 * the value is cached, and read via snd_hda_codec_get_pincfg()
 */
int snd_hda_add_pincfg(struct hda_codec *codec, struct snd_array *list,
		       hda_nid_t nid, unsigned int cfg)
{
	struct hda_pincfg *pin;
	unsigned int oldcfg;

	if (get_wcaps_type(get_wcaps(codec, nid)) != AC_WID_PIN)
		return -EINVAL;

	oldcfg = snd_hda_codec_get_pincfg(codec, nid);
	pin = look_up_pincfg(codec, list, nid);
	if (!pin) {
		pin = snd_array_new(list);
		if (!pin)
			return -ENOMEM;
		pin->nid = nid;
	}
	pin->cfg = cfg;

	/* change only when needed; e.g. if the pincfg is already present
	 * in user_pins[], don't write it
	 */
	cfg = snd_hda_codec_get_pincfg(codec, nid);
	if (oldcfg != cfg)
		set_pincfg(codec, nid, cfg);
	return 0;
}

/**
 * snd_hda_codec_set_pincfg - Override a pin default configuration
 * @codec: the HDA codec
 * @nid: NID to set the pin config
 * @cfg: the pin default config value
 *
 * Override a pin default configuration value in the cache.
 * This value can be read by snd_hda_codec_get_pincfg() in a higher
 * priority than the real hardware value.
 */
int snd_hda_codec_set_pincfg(struct hda_codec *codec,
			     hda_nid_t nid, unsigned int cfg)
{
	return snd_hda_add_pincfg(codec, &codec->driver_pins, nid, cfg);
}
EXPORT_SYMBOL_HDA(snd_hda_codec_set_pincfg);

/**
 * snd_hda_codec_get_pincfg - Obtain a pin-default configuration
 * @codec: the HDA codec
 * @nid: NID to get the pin config
 *
 * Get the current pin config value of the given pin NID.
 * If the pincfg value is cached or overridden via sysfs or driver,
 * returns the cached value.
 */
unsigned int snd_hda_codec_get_pincfg(struct hda_codec *codec, hda_nid_t nid)
{
	struct hda_pincfg *pin;

#ifdef CONFIG_SND_HDA_HWDEP
	pin = look_up_pincfg(codec, &codec->user_pins, nid);
	if (pin)
		return pin->cfg;
#endif
	pin = look_up_pincfg(codec, &codec->driver_pins, nid);
	if (pin)
		return pin->cfg;
	pin = look_up_pincfg(codec, &codec->init_pins, nid);
	if (pin)
		return pin->cfg;
	return 0;
}
EXPORT_SYMBOL_HDA(snd_hda_codec_get_pincfg);

/* restore all current pin configs */
static void restore_pincfgs(struct hda_codec *codec)
{
	int i;
	for (i = 0; i < codec->init_pins.used; i++) {
		struct hda_pincfg *pin = snd_array_elem(&codec->init_pins, i);
		set_pincfg(codec, pin->nid,
			   snd_hda_codec_get_pincfg(codec, pin->nid));
	}
}

/**
 * snd_hda_shutup_pins - Shut up all pins
 * @codec: the HDA codec
 *
 * Clear all pin controls to shup up before suspend for avoiding click noise.
 * The controls aren't cached so that they can be resumed properly.
 */
void snd_hda_shutup_pins(struct hda_codec *codec)
{
	int i;
	/* don't shut up pins when unloading the driver; otherwise it breaks
	 * the default pin setup at the next load of the driver
	 */
	if (codec->bus->shutdown)
		return;
	for (i = 0; i < codec->init_pins.used; i++) {
		struct hda_pincfg *pin = snd_array_elem(&codec->init_pins, i);
		/* use read here for syncing after issuing each verb */
		snd_hda_codec_read(codec, pin->nid, 0,
				   AC_VERB_SET_PIN_WIDGET_CONTROL, 0);
	}
	codec->pins_shutup = 1;
}