hda_generic.c

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/*
 * Universal Interface for Intel High Definition Audio Codec
 *
 * Generic widget tree parser
 *
 * Copyright (c) 2004 Takashi Iwai <[email protected]>
 *
 *  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/slab.h>
#include <linux/export.h>
#include <sound/core.h>
#include "hda_codec.h"
#include "hda_local.h"

/* widget node for parsing */
struct hda_gnode {
    hda_nid_t nid;      /* NID of this widget */
    unsigned short nconns;  /* number of input connections */
    hda_nid_t *conn_list;
    hda_nid_t slist[2]; /* temporay list */
    unsigned int wid_caps;  /* widget capabilities */
    unsigned char type; /* widget type */
    unsigned char pin_ctl;  /* pin controls */
    unsigned char checked;  /* the flag indicates that the node is already parsed */
    unsigned int pin_caps;  /* pin widget capabilities */
    unsigned int def_cfg;   /* default configuration */
    unsigned int amp_out_caps;  /* AMP out capabilities */
    unsigned int amp_in_caps;   /* AMP in capabilities */
    struct list_head list;
};

/* patch-specific record */

#define MAX_PCM_VOLS    2
struct pcm_vol {
    struct hda_gnode *node; /* Node for PCM volume */
    unsigned int index; /* connection of PCM volume */
};

struct hda_gspec {
    struct hda_gnode *dac_node[2];  /* DAC node */
    struct hda_gnode *out_pin_node[2];  /* Output pin (Line-Out) node */
    struct pcm_vol pcm_vol[MAX_PCM_VOLS];   /* PCM volumes */
    unsigned int pcm_vol_nodes; /* number of PCM volumes */

    struct hda_gnode *adc_node; /* ADC node */
    struct hda_gnode *cap_vol_node; /* Node for capture volume */
    unsigned int cur_cap_src;   /* current capture source */
    struct hda_input_mux input_mux;

    unsigned int def_amp_in_caps;
    unsigned int def_amp_out_caps;

    struct hda_pcm pcm_rec;     /* PCM information */

    struct list_head nid_list;  /* list of widgets */

#ifdef CONFIG_PM
#define MAX_LOOPBACK_AMPS   7
    struct hda_loopback_check loopback;
    int num_loopbacks;
    struct hda_amp_list loopback_list[MAX_LOOPBACK_AMPS + 1];
#endif
};

/*
 * retrieve the default device type from the default config value
 */
#define defcfg_type(node) (((node)->def_cfg & AC_DEFCFG_DEVICE) >> \
               AC_DEFCFG_DEVICE_SHIFT)
#define defcfg_location(node) (((node)->def_cfg & AC_DEFCFG_LOCATION) >> \
                   AC_DEFCFG_LOCATION_SHIFT)
#define defcfg_port_conn(node) (((node)->def_cfg & AC_DEFCFG_PORT_CONN) >> \
                AC_DEFCFG_PORT_CONN_SHIFT)

/*
 * destructor
 */
static void snd_hda_generic_free(struct hda_codec *codec)
{
    struct hda_gspec *spec = codec->spec;
    struct hda_gnode *node, *n;

    if (! spec)
        return;
    /* free all widgets */
    list_for_each_entry_safe(node, n, &spec->nid_list, list) {
        if (node->conn_list != node->slist)
            kfree(node->conn_list);
        kfree(node);
    }
    kfree(spec);
}


/*
 * add a new widget node and read its attributes
 */
static int add_new_node(struct hda_codec *codec, struct hda_gspec *spec, hda_nid_t nid)
{
    struct hda_gnode *node;
    int nconns;
    hda_nid_t conn_list[HDA_MAX_CONNECTIONS];

    node = kzalloc(sizeof(*node), GFP_KERNEL);
    if (node == NULL)
        return -ENOMEM;
    node->nid = nid;
    node->wid_caps = get_wcaps(codec, nid);
    node->type = get_wcaps_type(node->wid_caps);
    if (node->wid_caps & AC_WCAP_CONN_LIST) {
        nconns = snd_hda_get_connections(codec, nid, conn_list,
                         HDA_MAX_CONNECTIONS);
        if (nconns < 0) {
            kfree(node);
            return nconns;
        }
    } else {
        nconns = 0;
    }
    if (nconns <= ARRAY_SIZE(node->slist))
        node->conn_list = node->slist;
    else {
        node->conn_list = kmalloc(sizeof(hda_nid_t) * nconns,
                      GFP_KERNEL);
        if (! node->conn_list) {
            snd_printk(KERN_ERR "hda-generic: cannot malloc\n");
            kfree(node);
            return -ENOMEM;
        }
    }
    memcpy(node->conn_list, conn_list, nconns * sizeof(hda_nid_t));
    node->nconns = nconns;

    if (node->type == AC_WID_PIN) {
        node->pin_caps = snd_hda_query_pin_caps(codec, node->nid);
        node->pin_ctl = snd_hda_codec_read(codec, node->nid, 0, AC_VERB_GET_PIN_WIDGET_CONTROL, 0);
        node->def_cfg = snd_hda_codec_get_pincfg(codec, node->nid);
    }

    if (node->wid_caps & AC_WCAP_OUT_AMP) {
        if (node->wid_caps & AC_WCAP_AMP_OVRD)
            node->amp_out_caps = snd_hda_param_read(codec, node->nid, AC_PAR_AMP_OUT_CAP);
        if (! node->amp_out_caps)
            node->amp_out_caps = spec->def_amp_out_caps;
    }
    if (node->wid_caps & AC_WCAP_IN_AMP) {
        if (node->wid_caps & AC_WCAP_AMP_OVRD)
            node->amp_in_caps = snd_hda_param_read(codec, node->nid, AC_PAR_AMP_IN_CAP);
        if (! node->amp_in_caps)
            node->amp_in_caps = spec->def_amp_in_caps;
    }
    list_add_tail(&node->list, &spec->nid_list);
    return 0;
}

/*
 * build the AFG subtree
 */
static int build_afg_tree(struct hda_codec *codec)
{
    struct hda_gspec *spec = codec->spec;
    int i, nodes, err;
    hda_nid_t nid;

    if (snd_BUG_ON(!spec))
        return -EINVAL;

    spec->def_amp_out_caps = snd_hda_param_read(codec, codec->afg, AC_PAR_AMP_OUT_CAP);
    spec->def_amp_in_caps = snd_hda_param_read(codec, codec->afg, AC_PAR_AMP_IN_CAP);

    nodes = snd_hda_get_sub_nodes(codec, codec->afg, &nid);
    if (! nid || nodes < 0) {
        printk(KERN_ERR "Invalid AFG subtree\n");
        return -EINVAL;
    }

    /* parse all nodes belonging to the AFG */
    for (i = 0; i < nodes; i++, nid++) {
        if ((err = add_new_node(codec, spec, nid)) < 0)
            return err;
    }

    return 0;
}


/*
 * look for the node record for the given NID
 */
/* FIXME: should avoid the braindead linear search */
static struct hda_gnode *hda_get_node(struct hda_gspec *spec, hda_nid_t nid)
{
    struct hda_gnode *node;

    list_for_each_entry(node, &spec->nid_list, list) {
        if (node->nid == nid)
            return node;
    }
    return NULL;
}

/*
 * unmute (and set max vol) the output amplifier
 */
static int unmute_output(struct hda_codec *codec, struct hda_gnode *node)
{
    unsigned int val, ofs;
    snd_printdd("UNMUTE OUT: NID=0x%x\n", node->nid);
    val = (node->amp_out_caps & AC_AMPCAP_NUM_STEPS) >> AC_AMPCAP_NUM_STEPS_SHIFT;
    ofs = (node->amp_out_caps & AC_AMPCAP_OFFSET) >> AC_AMPCAP_OFFSET_SHIFT;
    if (val >= ofs)
        val -= ofs;
    snd_hda_codec_amp_stereo(codec, node->nid, HDA_OUTPUT, 0, 0xff, val);
    return 0;
}

/*
 * unmute (and set max vol) the input amplifier
 */
static int unmute_input(struct hda_codec *codec, struct hda_gnode *node, unsigned int index)
{
    unsigned int val, ofs;
    snd_printdd("UNMUTE IN: NID=0x%x IDX=0x%x\n", node->nid, index);
    val = (node->amp_in_caps & AC_AMPCAP_NUM_STEPS) >> AC_AMPCAP_NUM_STEPS_SHIFT;
    ofs = (node->amp_in_caps & AC_AMPCAP_OFFSET) >> AC_AMPCAP_OFFSET_SHIFT;
    if (val >= ofs)
        val -= ofs;
    snd_hda_codec_amp_stereo(codec, node->nid, HDA_INPUT, index, 0xff, val);
    return 0;
}

/*
 * select the input connection of the given node.
 */
static int select_input_connection(struct hda_codec *codec, struct hda_gnode *node,
                   unsigned int index)
{
    snd_printdd("CONNECT: NID=0x%x IDX=0x%x\n", node->nid, index);
    return snd_hda_codec_write_cache(codec, node->nid, 0,
                     AC_VERB_SET_CONNECT_SEL, index);
}

/*
 * clear checked flag of each node in the node list
 */
static void clear_check_flags(struct hda_gspec *spec)
{
    struct hda_gnode *node;

    list_for_each_entry(node, &spec->nid_list, list) {
        node->checked = 0;
    }
}

/*
 * parse the output path recursively until reach to an audio output widget
 *
 * returns 0 if not found, 1 if found, or a negative error code.
 */
static int parse_output_path(struct hda_codec *codec, struct hda_gspec *spec,
                 struct hda_gnode *node, int dac_idx)
{
    int i, err;
    struct hda_gnode *child;

    if (node->checked)
        return 0;

    node->checked = 1;
    if (node->type == AC_WID_AUD_OUT) {
        if (node->wid_caps & AC_WCAP_DIGITAL) {
            snd_printdd("Skip Digital OUT node %x\n", node->nid);
            return 0;
        }
        snd_printdd("AUD_OUT found %x\n", node->nid);
        if (spec->dac_node[dac_idx]) {
            /* already DAC node is assigned, just unmute & connect */
            return node == spec->dac_node[dac_idx];
        }
        spec->dac_node[dac_idx] = node;
        if ((node->wid_caps & AC_WCAP_OUT_AMP) &&
            spec->pcm_vol_nodes < MAX_PCM_VOLS) {
            spec->pcm_vol[spec->pcm_vol_nodes].node = node;
            spec->pcm_vol[spec->pcm_vol_nodes].index = 0;
            spec->pcm_vol_nodes++;
        }
        return 1; /* found */
    }

    for (i = 0; i < node->nconns; i++) {
        child = hda_get_node(spec, node->conn_list[i]);
        if (! child)
            continue;
        err = parse_output_path(codec, spec, child, dac_idx);
        if (err < 0)
            return err;
        else if (err > 0) {
            /* found one,
             * select the path, unmute both input and output
             */
            if (node->nconns > 1)
                select_input_connection(codec, node, i);
            unmute_input(codec, node, i);
            unmute_output(codec, node);
            if (spec->dac_node[dac_idx] &&
                spec->pcm_vol_nodes < MAX_PCM_VOLS &&
                !(spec->dac_node[dac_idx]->wid_caps &
                  AC_WCAP_OUT_AMP)) {
                if ((node->wid_caps & AC_WCAP_IN_AMP) ||
                    (node->wid_caps & AC_WCAP_OUT_AMP)) {
                    int n = spec->pcm_vol_nodes;
                    spec->pcm_vol[n].node = node;
                    spec->pcm_vol[n].index = i;
                    spec->pcm_vol_nodes++;
                }
            }
            return 1;
        }
    }
    return 0;
}

/*
 * Look for the output PIN widget with the given jack type
 * and parse the output path to that PIN.
 *
 * Returns the PIN node when the path to DAC is established.
 */
static struct hda_gnode *parse_output_jack(struct hda_codec *codec,
                       struct hda_gspec *spec,
                       int jack_type)
{
    struct hda_gnode *node;
    int err;

    list_for_each_entry(node, &spec->nid_list, list) {
        if (node->type != AC_WID_PIN)
            continue;
        /* output capable? */
        if (! (node->pin_caps & AC_PINCAP_OUT))
            continue;
        if (defcfg_port_conn(node) == AC_JACK_PORT_NONE)
            continue; /* unconnected */
        if (jack_type >= 0) {
            if (jack_type != defcfg_type(node))
                continue;
            if (node->wid_caps & AC_WCAP_DIGITAL)
                continue; /* skip SPDIF */
        } else {
            /* output as default? */
            if (! (node->pin_ctl & AC_PINCTL_OUT_EN))
                continue;
        }
        clear_check_flags(spec);
        err = parse_output_path(codec, spec, node, 0);
        if (err < 0)
            return NULL;
        if (! err && spec->out_pin_node[0]) {
            err = parse_output_path(codec, spec, node, 1);
            if (err < 0)
                return NULL;
        }
        if (err > 0) {
            /* unmute the PIN output */
            unmute_output(codec, node);
            /* set PIN-Out enable */
            snd_hda_codec_write_cache(codec, node->nid, 0,
                        AC_VERB_SET_PIN_WIDGET_CONTROL,
                        AC_PINCTL_OUT_EN |
                        ((node->pin_caps & AC_PINCAP_HP_DRV) ?
                         AC_PINCTL_HP_EN : 0));
            return node;
        }
    }
    return NULL;
}


/*
 * parse outputs
 */
static int parse_output(struct hda_codec *codec)
{
    struct hda_gspec *spec = codec->spec;
    struct hda_gnode *node;

    /*
     * Look for the output PIN widget
     */
    /* first, look for the line-out pin */
    node = parse_output_jack(codec, spec, AC_JACK_LINE_OUT);
    if (node) /* found, remember the PIN node */
        spec->out_pin_node[0] = node;
    else {
        /* if no line-out is found, try speaker out */
        node = parse_output_jack(codec, spec, AC_JACK_SPEAKER);
        if (node)
            spec->out_pin_node[0] = node;
    }
    /* look for the HP-out pin */
    node = parse_output_jack(codec, spec, AC_JACK_HP_OUT);
    if (node) {
        if (! spec->out_pin_node[0])
            spec->out_pin_node[0] = node;
        else
            spec->out_pin_node[1] = node;
    }

    if (! spec->out_pin_node[0]) {
        /* no line-out or HP pins found,
         * then choose for the first output pin
         */
        spec->out_pin_node[0] = parse_output_jack(codec, spec, -1);
        if (! spec->out_pin_node[0])
            snd_printd("hda_generic: no proper output path found\n");
    }

    return 0;
}

/*
 * input MUX
 */

/* control callbacks */
static int capture_source_info(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_info *uinfo)
{
    struct hda_codec *codec = snd_kcontrol_chip(kcontrol);
    struct hda_gspec *spec = codec->spec;
    return snd_hda_input_mux_info(&spec->input_mux, uinfo);
}

static int capture_source_get(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
{
    struct hda_codec *codec = snd_kcontrol_chip(kcontrol);
    struct hda_gspec *spec = codec->spec;

    ucontrol->value.enumerated.item[0] = spec->cur_cap_src;
    return 0;
}

static int capture_source_put(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
{
    struct hda_codec *codec = snd_kcontrol_chip(kcontrol);
    struct hda_gspec *spec = codec->spec;
    return snd_hda_input_mux_put(codec, &spec->input_mux, ucontrol,
                     spec->adc_node->nid, &spec->cur_cap_src);
}

/*
 * return the string name of the given input PIN widget
 */
static const char *get_input_type(struct hda_gnode *node, unsigned int *pinctl)
{
    unsigned int location = defcfg_location(node);
    switch (defcfg_type(node)) {
    case AC_JACK_LINE_IN:
        if ((location & 0x0f) == AC_JACK_LOC_FRONT)
            return "Front Line";
        return "Line";
    case AC_JACK_CD:
#if 0
        if (pinctl)
            *pinctl |= AC_PINCTL_VREF_GRD;
#endif
        return "CD";
    case AC_JACK_AUX:
        if ((location & 0x0f) == AC_JACK_LOC_FRONT)
            return "Front Aux";
        return "Aux";
    case AC_JACK_MIC_IN:
        if (pinctl &&
            (node->pin_caps &
             (AC_PINCAP_VREF_80 << AC_PINCAP_VREF_SHIFT)))
            *pinctl |= AC_PINCTL_VREF_80;
        if ((location & 0x0f) == AC_JACK_LOC_FRONT)
            return "Front Mic";
        return "Mic";
    case AC_JACK_SPDIF_IN:
        return "SPDIF";
    case AC_JACK_DIG_OTHER_IN:
        return "Digital";
    }
    return NULL;
}

/*
 * parse the nodes recursively until reach to the input PIN
 *
 * returns 0 if not found, 1 if found, or a negative error code.
 */
static int parse_adc_sub_nodes(struct hda_codec *codec, struct hda_gspec *spec,
                   struct hda_gnode *node, int idx)
{
    int i, err;
    unsigned int pinctl;
    const char *type;

    if (node->checked)
        return 0;

    node->checked = 1;
    if (node->type != AC_WID_PIN) {
        for (i = 0; i < node->nconns; i++) {
            struct hda_gnode *child;
            child = hda_get_node(spec, node->conn_list[i]);
            if (! child)
                continue;
            err = parse_adc_sub_nodes(codec, spec, child, idx);
            if (err < 0)
                return err;
            if (err > 0) {
                /* found one,
                 * select the path, unmute both input and output
                 */
                if (node->nconns > 1)
                    select_input_connection(codec, node, i);
                unmute_input(codec, node, i);
                unmute_output(codec, node);
                return err;
            }
        }
        return 0;
    }

    /* input capable? */
    if (! (node->pin_caps & AC_PINCAP_IN))
        return 0;

    if (defcfg_port_conn(node) == AC_JACK_PORT_NONE)
        return 0; /* unconnected */

    if (node->wid_caps & AC_WCAP_DIGITAL)
        return 0; /* skip SPDIF */

    if (spec->input_mux.num_items >= HDA_MAX_NUM_INPUTS) {
        snd_printk(KERN_ERR "hda_generic: Too many items for capture\n");
        return -EINVAL;
    }

    pinctl = AC_PINCTL_IN_EN;
    /* create a proper capture source label */
    type = get_input_type(node, &pinctl);
    if (! type) {
        /* input as default? */
        if (! (node->pin_ctl & AC_PINCTL_IN_EN))
            return 0;
        type = "Input";
    }
    snd_hda_add_imux_item(&spec->input_mux, type, idx, NULL);

    /* unmute the PIN external input */
    unmute_input(codec, node, 0); /* index = 0? */
    /* set PIN-In enable */
    snd_hda_codec_write_cache(codec, node->nid, 0,
                  AC_VERB_SET_PIN_WIDGET_CONTROL, pinctl);

    return 1; /* found */
}

/*
 * parse input
 */
static int parse_input_path(struct hda_codec *codec, struct hda_gnode *adc_node)
{
    struct hda_gspec *spec = codec->spec;
    struct hda_gnode *node;
    int i, err;

    snd_printdd("AUD_IN = %x\n", adc_node->nid);
    clear_check_flags(spec);

    // awk added - fixed no recording due to muted widget
    unmute_input(codec, adc_node, 0);
    
    /*
     * check each connection of the ADC
     * if it reaches to a proper input PIN, add the path as the
     * input path.
     */
    /* first, check the direct connections to PIN widgets */
    for (i = 0; i < adc_node->nconns; i++) {
        node = hda_get_node(spec, adc_node->conn_list[i]);
        if (node && node->type == AC_WID_PIN) {
            err = parse_adc_sub_nodes(codec, spec, node, i);
            if (err < 0)
                return err;
        }
    }
    /* ... then check the rests, more complicated connections */
    for (i = 0; i < adc_node->nconns; i++) {
        node = hda_get_node(spec, adc_node->conn_list[i]);
        if (node && node->type != AC_WID_PIN) {
            err = parse_adc_sub_nodes(codec, spec, node, i);
            if (err < 0)
                return err;
        }
    }

    if (! spec->input_mux.num_items)
        return 0; /* no input path found... */

    snd_printdd("[Capture Source] NID=0x%x, #SRC=%d\n", adc_node->nid, spec->input_mux.num_items);
    for (i = 0; i < spec->input_mux.num_items; i++)
        snd_printdd("  [%s] IDX=0x%x\n", spec->input_mux.items[i].label,
                spec->input_mux.items[i].index);

    spec->adc_node = adc_node;
    return 1;
}

/*
 * parse input
 */
static int parse_input(struct hda_codec *codec)
{
    struct hda_gspec *spec = codec->spec;
    struct hda_gnode *node;
    int err;

    /*
     * At first we look for an audio input widget.
     * If it reaches to certain input PINs, we take it as the
     * input path.
     */
    list_for_each_entry(node, &spec->nid_list, list) {
        if (node->wid_caps & AC_WCAP_DIGITAL)
            continue; /* skip SPDIF */
        if (node->type == AC_WID_AUD_IN) {
            err = parse_input_path(codec, node);
            if (err < 0)
                return err;
            else if (err > 0)
                return 0;
        }
    }
    snd_printd("hda_generic: no proper input path found\n");
    return 0;
}

#ifdef CONFIG_PM
static void add_input_loopback(struct hda_codec *codec, hda_nid_t nid,
                   int dir, int idx)
{
    struct hda_gspec *spec = codec->spec;
    struct hda_amp_list *p;

    if (spec->num_loopbacks >= MAX_LOOPBACK_AMPS) {
        snd_printk(KERN_ERR "hda_generic: Too many loopback ctls\n");
        return;
    }
    p = &spec->loopback_list[spec->num_loopbacks++];
    p->nid = nid;
    p->dir = dir;
    p->idx = idx;
    spec->loopback.amplist = spec->loopback_list;
}
#else
#define add_input_loopback(codec,nid,dir,idx)
#endif

/*
 * create mixer controls if possible
 */
static int create_mixer(struct hda_codec *codec, struct hda_gnode *node,
            unsigned int index, const char *type,
            const char *dir_sfx, int is_loopback)
{
    char name[32];
    int err;
    int created = 0;
    struct snd_kcontrol_new knew;

    if (type)
        sprintf(name, "%s %s Switch", type, dir_sfx);
    else
        sprintf(name, "%s Switch", dir_sfx);
    if ((node->wid_caps & AC_WCAP_IN_AMP) &&
        (node->amp_in_caps & AC_AMPCAP_MUTE)) {
        knew = (struct snd_kcontrol_new)HDA_CODEC_MUTE(name, node->nid, index, HDA_INPUT);
        if (is_loopback)
            add_input_loopback(codec, node->nid, HDA_INPUT, index);
        snd_printdd("[%s] NID=0x%x, DIR=IN, IDX=0x%x\n", name, node->nid, index);
        err = snd_hda_ctl_add(codec, node->nid,
                    snd_ctl_new1(&knew, codec));
        if (err < 0)
            return err;
        created = 1;
    } else if ((node->wid_caps & AC_WCAP_OUT_AMP) &&
           (node->amp_out_caps & AC_AMPCAP_MUTE)) {
        knew = (struct snd_kcontrol_new)HDA_CODEC_MUTE(name, node->nid, 0, HDA_OUTPUT);
        if (is_loopback)
            add_input_loopback(codec, node->nid, HDA_OUTPUT, 0);
        snd_printdd("[%s] NID=0x%x, DIR=OUT\n", name, node->nid);
        err = snd_hda_ctl_add(codec, node->nid,
                    snd_ctl_new1(&knew, codec));
        if (err < 0)
            return err;
        created = 1;
    }

    if (type)
        sprintf(name, "%s %s Volume", type, dir_sfx);
    else
        sprintf(name, "%s Volume", dir_sfx);
    if ((node->wid_caps & AC_WCAP_IN_AMP) &&
        (node->amp_in_caps & AC_AMPCAP_NUM_STEPS)) {
        knew = (struct snd_kcontrol_new)HDA_CODEC_VOLUME(name, node->nid, index, HDA_INPUT);
        snd_printdd("[%s] NID=0x%x, DIR=IN, IDX=0x%x\n", name, node->nid, index);
        err = snd_hda_ctl_add(codec, node->nid,
                    snd_ctl_new1(&knew, codec));
        if (err < 0)
            return err;
        created = 1;
    } else if ((node->wid_caps & AC_WCAP_OUT_AMP) &&
           (node->amp_out_caps & AC_AMPCAP_NUM_STEPS)) {
        knew = (struct snd_kcontrol_new)HDA_CODEC_VOLUME(name, node->nid, 0, HDA_OUTPUT);
        snd_printdd("[%s] NID=0x%x, DIR=OUT\n", name, node->nid);
        err = snd_hda_ctl_add(codec, node->nid,
                    snd_ctl_new1(&knew, codec));
        if (err < 0)
            return err;
        created = 1;
    }

    return created;
}

/*
 * check whether the controls with the given name and direction suffix already exist
 */
static int check_existing_control(struct hda_codec *codec, const char *type, const char *dir)
{
    struct snd_ctl_elem_id id;
    memset(&id, 0, sizeof(id));
    sprintf(id.name, "%s %s Volume", type, dir);
    id.iface = SNDRV_CTL_ELEM_IFACE_MIXER;
    if (snd_ctl_find_id(codec->bus->card, &id))
        return 1;
    sprintf(id.name, "%s %s Switch", type, dir);
    id.iface = SNDRV_CTL_ELEM_IFACE_MIXER;
    if (snd_ctl_find_id(codec->bus->card, &id))
        return 1;
    return 0;
}

/*
 * build output mixer controls
 */
static int create_output_mixers(struct hda_codec *codec,
                const char * const *names)
{
    struct hda_gspec *spec = codec->spec;
    int i, err;

    for (i = 0; i < spec->pcm_vol_nodes; i++) {
        err = create_mixer(codec, spec->pcm_vol[i].node,
                   spec->pcm_vol[i].index,
                   names[i], "Playback", 0);
        if (err < 0)
            return err;
    }
    return 0;
}

static int build_output_controls(struct hda_codec *codec)
{
    struct hda_gspec *spec = codec->spec;
    static const char * const types_speaker[] = { "Speaker", "Headphone" };
    static const char * const types_line[] = { "Front", "Headphone" };

    switch (spec->pcm_vol_nodes) {
    case 1:
        return create_mixer(codec, spec->pcm_vol[0].node,
                    spec->pcm_vol[0].index,
                    "Master", "Playback", 0);
    case 2:
        if (defcfg_type(spec->out_pin_node[0]) == AC_JACK_SPEAKER)
            return create_output_mixers(codec, types_speaker);
        else
            return create_output_mixers(codec, types_line);
    }
    return 0;
}

/* create capture volume/switch */
static int build_input_controls(struct hda_codec *codec)
{
    struct hda_gspec *spec = codec->spec;
    struct hda_gnode *adc_node = spec->adc_node;
    int i, err;
    static struct snd_kcontrol_new cap_sel = {
        .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
        .name = "Capture Source",
        .info = capture_source_info,
        .get = capture_source_get,
        .put = capture_source_put,
    };

    if (! adc_node || ! spec->input_mux.num_items)
        return 0; /* not found */

    spec->cur_cap_src = 0;
    select_input_connection(codec, adc_node,
                spec->input_mux.items[0].index);

    /* create capture volume and switch controls if the ADC has an amp */
    /* do we have only a single item? */
    if (spec->input_mux.num_items == 1) {
        err = create_mixer(codec, adc_node,
                   spec->input_mux.items[0].index,
                   NULL, "Capture", 0);
        if (err < 0)
            return err;
        return 0;
    }

    /* create input MUX if multiple sources are available */
    err = snd_hda_ctl_add(codec, spec->adc_node->nid,
                  snd_ctl_new1(&cap_sel, codec));
    if (err < 0)
        return err;

    /* no volume control? */
    if (! (adc_node->wid_caps & AC_WCAP_IN_AMP) ||
        ! (adc_node->amp_in_caps & AC_AMPCAP_NUM_STEPS))
        return 0;

    for (i = 0; i < spec->input_mux.num_items; i++) {
        struct snd_kcontrol_new knew;
        char name[32];
        sprintf(name, "%s Capture Volume",
            spec->input_mux.items[i].label);
        knew = (struct snd_kcontrol_new)
            HDA_CODEC_VOLUME(name, adc_node->nid,
                     spec->input_mux.items[i].index,
                     HDA_INPUT);
        err = snd_hda_ctl_add(codec, adc_node->nid,
                    snd_ctl_new1(&knew, codec));
        if (err < 0)
            return err;
    }

    return 0;
}


/*
 * parse the nodes recursively until reach to the output PIN.
 *
 * returns 0 - if not found,
 *         1 - if found, but no mixer is created
 *         2 - if found and mixer was already created, (just skip)
 *         a negative error code
 */
static int parse_loopback_path(struct hda_codec *codec, struct hda_gspec *spec,
                   struct hda_gnode *node, struct hda_gnode *dest_node,
                   const char *type)
{
    int i, err;

    if (node->checked)
        return 0;

    node->checked = 1;
    if (node == dest_node) {
        /* loopback connection found */
        return 1;
    }

    for (i = 0; i < node->nconns; i++) {
        struct hda_gnode *child = hda_get_node(spec, node->conn_list[i]);
        if (! child)
            continue;
        err = parse_loopback_path(codec, spec, child, dest_node, type);
        if (err < 0)
            return err;
        else if (err >= 1) {
            if (err == 1) {
                err = create_mixer(codec, node, i, type,
                           "Playback", 1);
                if (err < 0)
                    return err;
                if (err > 0)
                    return 2; /* ok, created */
                /* not created, maybe in the lower path */
                err = 1;
            }
            /* connect and unmute */
            if (node->nconns > 1)
                select_input_connection(codec, node, i);
            unmute_input(codec, node, i);
            unmute_output(codec, node);
            return err;
        }
    }
    return 0;
}

/*
 * parse the tree and build the loopback controls
 */
static int build_loopback_controls(struct hda_codec *codec)
{
    struct hda_gspec *spec = codec->spec;
    struct hda_gnode *node;
    int err;
    const char *type;

    if (! spec->out_pin_node[0])
        return 0;

    list_for_each_entry(node, &spec->nid_list, list) {
        if (node->type != AC_WID_PIN)
            continue;
        /* input capable? */
        if (! (node->pin_caps & AC_PINCAP_IN))
            return 0;
        type = get_input_type(node, NULL);
        if (type) {
            if (check_existing_control(codec, type, "Playback"))
                continue;
            clear_check_flags(spec);
            err = parse_loopback_path(codec, spec,
                          spec->out_pin_node[0],
                          node, type);
            if (err < 0)
                return err;
            if (! err)
                continue;
        }
    }
    return 0;
}

/*
 * build mixer controls
 */
static int build_generic_controls(struct hda_codec *codec)
{
    int err;

    if ((err = build_input_controls(codec)) < 0 ||
        (err = build_output_controls(codec)) < 0 ||
        (err = build_loopback_controls(codec)) < 0)
        return err;

    return 0;
}

/*
 * PCM
 */
static struct hda_pcm_stream generic_pcm_playback = {
    .substreams = 1,
    .channels_min = 2,
    .channels_max = 2,
};

static int generic_pcm2_prepare(struct hda_pcm_stream *hinfo,
                struct hda_codec *codec,
                unsigned int stream_tag,
                unsigned int format,
                struct snd_pcm_substream *substream)
{
    struct hda_gspec *spec = codec->spec;

    snd_hda_codec_setup_stream(codec, hinfo->nid, stream_tag, 0, format);
    snd_hda_codec_setup_stream(codec, spec->dac_node[1]->nid,
                   stream_tag, 0, format);
    return 0;
}

static int generic_pcm2_cleanup(struct hda_pcm_stream *hinfo,
                struct hda_codec *codec,
                struct snd_pcm_substream *substream)
{
    struct hda_gspec *spec = codec->spec;

    snd_hda_codec_cleanup_stream(codec, hinfo->nid);
    snd_hda_codec_cleanup_stream(codec, spec->dac_node[1]->nid);
    return 0;
}

static int build_generic_pcms(struct hda_codec *codec)
{
    struct hda_gspec *spec = codec->spec;
    struct hda_pcm *info = &spec->pcm_rec;

    if (! spec->dac_node[0] && ! spec->adc_node) {
        snd_printd("hda_generic: no PCM found\n");
        return 0;
    }

    codec->num_pcms = 1;
    codec->pcm_info = info;

    info->name = "HDA Generic";
    if (spec->dac_node[0]) {
        info->stream[0] = generic_pcm_playback;
        info->stream[0].nid = spec->dac_node[0]->nid;
        if (spec->dac_node[1]) {
            info->stream[0].ops.prepare = generic_pcm2_prepare;
            info->stream[0].ops.cleanup = generic_pcm2_cleanup;
        }
    }
    if (spec->adc_node) {
        info->stream[1] = generic_pcm_playback;
        info->stream[1].nid = spec->adc_node->nid;
    }

    return 0;
}

#ifdef CONFIG_PM
static int generic_check_power_status(struct hda_codec *codec, hda_nid_t nid)
{
    struct hda_gspec *spec = codec->spec;
    return snd_hda_check_amp_list_power(codec, &spec->loopback, nid);
}
#endif


/*
 */
static struct hda_codec_ops generic_patch_ops = {
    .build_controls = build_generic_controls,
    .build_pcms = build_generic_pcms,
    .free = snd_hda_generic_free,
#ifdef CONFIG_PM
    .check_power_status = generic_check_power_status,
#endif
};

/*
 * the generic parser
 */
int snd_hda_parse_generic_codec(struct hda_codec *codec)
{
    struct hda_gspec *spec;
    int err;

    if(!codec->afg)
        return 0;

    spec = kzalloc(sizeof(*spec), GFP_KERNEL);
    if (spec == NULL) {
        printk(KERN_ERR "hda_generic: can't allocate spec\n");
        return -ENOMEM;
    }
    codec->spec = spec;
    INIT_LIST_HEAD(&spec->nid_list);

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

    if ((err = parse_input(codec)) < 0 ||
        (err = parse_output(codec)) < 0)
        goto error;

    codec->patch_ops = generic_patch_ops;

    return 0;

 error:
    snd_hda_generic_free(codec);
    return err;
}
EXPORT_SYMBOL(snd_hda_parse_generic_codec);