/*
 *  Support for Digigram Lola PCI-e boards
 *
 *  Copyright (c) 2011 Takashi Iwai <tiwai@suse.de>
 *
 *  This program 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 program 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/kernel.h>
#include <linux/init.h>
#include <linux/vmalloc.h>
#include <linux/io.h>
#include <sound/core.h>
#include <sound/control.h>
#include <sound/pcm.h>
#include <sound/tlv.h>
#include "lola.h"

static int lola_init_pin(struct lola *chip, struct lola_pin *pin,
                         int dir, int nid)
{
        unsigned int val;
        int err;

        pin->nid = nid;
        err = lola_read_param(chip, nid, LOLA_PAR_AUDIO_WIDGET_CAP, &val);
        if (err < 0) {
                dev_err(chip->card->dev, "Can't read wcaps for 0x%x\n", nid);
                return err;
        }
        val &= 0x00f00fff; /* test TYPE and bits 0..11 */
        if (val == 0x00400200)    /* Type = 4, Digital = 1 */
                pin->is_analog = false;
        else if (val == 0x0040000a && dir == CAPT) /* Dig=0, InAmp/ovrd */
                pin->is_analog = true;
        else if (val == 0x0040000c && dir == PLAY) /* Dig=0, OutAmp/ovrd */
                pin->is_analog = true;
        else {
                dev_err(chip->card->dev, "Invalid wcaps 0x%x for 0x%x\n", val, nid);
                return -EINVAL;
        }

        /* analog parameters only following, so continue in case of Digital pin
         */
        if (!pin->is_analog)
                return 0;

        if (dir == PLAY)
                err = lola_read_param(chip, nid, LOLA_PAR_AMP_OUT_CAP, &val);
        else
                err = lola_read_param(chip, nid, LOLA_PAR_AMP_IN_CAP, &val);
        if (err < 0) {
                dev_err(chip->card->dev, "Can't read AMP-caps for 0x%x\n", nid);
                return err;
        }

        pin->amp_mute = LOLA_AMP_MUTE_CAPABLE(val);
        pin->amp_step_size = LOLA_AMP_STEP_SIZE(val);
        pin->amp_num_steps = LOLA_AMP_NUM_STEPS(val);
        if (pin->amp_num_steps) {
                /* zero as mute state */
                pin->amp_num_steps++;
                pin->amp_step_size++;
        }
        pin->amp_offset = LOLA_AMP_OFFSET(val);

        err = lola_codec_read(chip, nid, LOLA_VERB_GET_MAX_LEVEL, 0, 0, &val,
                              NULL);
        if (err < 0) {
                dev_err(chip->card->dev, "Can't get MAX_LEVEL 0x%x\n", nid);
                return err;
        }
        pin->max_level = val & 0x3ff;   /* 10 bits */

        pin->config_default_reg = 0;
        pin->fixed_gain_list_len = 0;
        pin->cur_gain_step = 0;

        return 0;
}

int lola_init_pins(struct lola *chip, int dir, int *nidp)
{
        int i, err, nid;
        nid = *nidp;
        for (i = 0; i < chip->pin[dir].num_pins; i++, nid++) {
                err = lola_init_pin(chip, &chip->pin[dir].pins[i], dir, nid);
                if (err < 0)
                        return err;
                if (chip->pin[dir].pins[i].is_analog)
                        chip->pin[dir].num_analog_pins++;
        }
        *nidp = nid;
        return 0;
}

void lola_free_mixer(struct lola *chip)
{
        vfree(chip->mixer.array_saved);
}

int lola_init_mixer_widget(struct lola *chip, int nid)
{
        unsigned int val;
        int err;

        err = lola_read_param(chip, nid, LOLA_PAR_AUDIO_WIDGET_CAP, &val);
        if (err < 0) {
                dev_err(chip->card->dev, "Can't read wcaps for 0x%x\n", nid);
                return err;
        }

        if ((val & 0xfff00000) != 0x02f00000) { /* test SubType and Type */
                dev_dbg(chip->card->dev, "No valid mixer widget\n");
                return 0;
        }

        chip->mixer.nid = nid;
        chip->mixer.caps = val;
        chip->mixer.array = (struct lola_mixer_array __iomem *)
                (chip->bar[BAR1].remap_addr + LOLA_BAR1_SOURCE_GAIN_ENABLE);

        /* reserve memory to copy mixer data for sleep mode transitions */
        chip->mixer.array_saved = vmalloc(sizeof(struct lola_mixer_array));

        /* mixer matrix sources are physical input data and play streams */
        chip->mixer.src_stream_outs = chip->pcm[PLAY].num_streams;
        chip->mixer.src_phys_ins = chip->pin[CAPT].num_pins;

        /* mixer matrix destinations are record streams and physical output */
        chip->mixer.dest_stream_ins = chip->pcm[CAPT].num_streams;
        chip->mixer.dest_phys_outs = chip->pin[PLAY].num_pins;

        /* mixer matrix may have unused areas between PhysIn and
         * Play or Record and PhysOut zones
         */
        chip->mixer.src_stream_out_ofs = chip->mixer.src_phys_ins +
                LOLA_MIXER_SRC_INPUT_PLAY_SEPARATION(val);
        chip->mixer.dest_phys_out_ofs = chip->mixer.dest_stream_ins +
                LOLA_MIXER_DEST_REC_OUTPUT_SEPARATION(val);

        /* example : MixerMatrix of LoLa881 (LoLa16161 uses unused zones)
         * +-+  0-------8------16-------8------16
         * | |  |       |       |       |       |
         * |s|  | INPUT |       | INPUT |       |
         * | |->|  ->   |unused |  ->   |unused |
         * |r|  |CAPTURE|       | OUTPUT|       |
         * | |  |  MIX  |       |  MIX  |       |
         * |c|  8--------------------------------
         * | |  |       |       |       |       |
         * | |  |       |       |       |       |
         * |g|  |unused |unused |unused |unused |
         * | |  |       |       |       |       |
         * |a|  |       |       |       |       |
         * | |  16-------------------------------
         * |i|  |       |       |       |       |
         * | |  | PLAYBK|       | PLAYBK|       |
         * |n|->|  ->   |unused |  ->   |unused |
         * | |  |CAPTURE|       | OUTPUT|       |
         * | |  |  MIX  |       |  MIX  |       |
         * |a|  8--------------------------------
         * |r|  |       |       |       |       |
         * |r|  |       |       |       |       |
         * |a|  |unused |unused |unused |unused |
         * |y|  |       |       |       |       |
         * | |  |       |       |       |       |
         * +++  16--|---------------|------------
         *      +---V---------------V-----------+
         *      |  dest_mix_gain_enable array   |
         *      +-------------------------------+
         */
        /* example : MixerMatrix of LoLa280
         * +-+  0-------8-2
         * | |  |       | |
         * |s|  | INPUT | |     INPUT
         * |r|->|  ->   | |      ->
         * |c|  |CAPTURE| | <-  OUTPUT
         * | |  |  MIX  | |      MIX
         * |g|  8----------
         * |a|  |       | |
         * |i|  | PLAYBK| |     PLAYBACK
         * |n|->|  ->   | |      ->
         * | |  |CAPTURE| | <-  OUTPUT
         * |a|  |  MIX  | |      MIX
         * |r|  8---|----|-
         * |r|  +---V----V-------------------+
         * |a|  | dest_mix_gain_enable array |
         * |y|  +----------------------------+
         */
        if (chip->mixer.src_stream_out_ofs > MAX_AUDIO_INOUT_COUNT ||
            chip->mixer.dest_phys_out_ofs > MAX_STREAM_IN_COUNT) {
                dev_err(chip->card->dev, "Invalid mixer widget size\n");
                return -EINVAL;
        }

        chip->mixer.src_mask = ((1U << chip->mixer.src_phys_ins) - 1) |
                (((1U << chip->mixer.src_stream_outs) - 1)
                 << chip->mixer.src_stream_out_ofs);
        chip->mixer.dest_mask = ((1U << chip->mixer.dest_stream_ins) - 1) |
                (((1U << chip->mixer.dest_phys_outs) - 1)
                 << chip->mixer.dest_phys_out_ofs);

        dev_dbg(chip->card->dev, "Mixer src_mask=%x, dest_mask=%x\n",
                    chip->mixer.src_mask, chip->mixer.dest_mask);

        return 0;
}

static int lola_mixer_set_src_gain(struct lola *chip, unsigned int id,
                                   unsigned short gain, bool on)
{
        unsigned int oldval, val;

        if (!(chip->mixer.src_mask & (1 << id)))
                return -EINVAL;
        oldval = val = readl(&chip->mixer.array->src_gain_enable);
        if (on)
                val |= (1 << id);
        else
                val &= ~(1 << id);
        /* test if values unchanged */
        if ((val == oldval) &&
            (gain == readw(&chip->mixer.array->src_gain[id])))
                return 0;

        dev_dbg(chip->card->dev,
                "lola_mixer_set_src_gain (id=%d, gain=%d) enable=%x\n",
                        id, gain, val);
        writew(gain, &chip->mixer.array->src_gain[id]);
        writel(val, &chip->mixer.array->src_gain_enable);
        lola_codec_flush(chip);
        /* inform micro-controller about the new source gain */
        return lola_codec_write(chip, chip->mixer.nid,
                                LOLA_VERB_SET_SOURCE_GAIN, id, 0);
}

#if 0 /* not used */
static int lola_mixer_set_src_gains(struct lola *chip, unsigned int mask,
                                    unsigned short *gains)
{
        int i;

        if ((chip->mixer.src_mask & mask) != mask)
                return -EINVAL;
        for (i = 0; i < LOLA_MIXER_DIM; i++) {
                if (mask & (1 << i)) {
                        writew(*gains, &chip->mixer.array->src_gain[i]);
                        gains++;
                }
        }
        writel(mask, &chip->mixer.array->src_gain_enable);
        lola_codec_flush(chip);
        if (chip->mixer.caps & LOLA_PEAK_METER_CAN_AGC_MASK) {
                /* update for all srcs at once */
                return lola_codec_write(chip, chip->mixer.nid,
                                        LOLA_VERB_SET_SOURCE_GAIN, 0x80, 0);
        }
        /* update manually */
        for (i = 0; i < LOLA_MIXER_DIM; i++) {
                if (mask & (1 << i)) {
                        lola_codec_write(chip, chip->mixer.nid,
                                         LOLA_VERB_SET_SOURCE_GAIN, i, 0);
                }
        }
        return 0;
}
#endif /* not used */

static int lola_mixer_set_mapping_gain(struct lola *chip,
                                       unsigned int src, unsigned int dest,
                                       unsigned short gain, bool on)
{
        unsigned int val;

        if (!(chip->mixer.src_mask & (1 << src)) ||
            !(chip->mixer.dest_mask & (1 << dest)))
                return -EINVAL;
        if (on)
                writew(gain, &chip->mixer.array->dest_mix_gain[dest][src]);
        val = readl(&chip->mixer.array->dest_mix_gain_enable[dest]);
        if (on)
                val |= (1 << src);
        else
                val &= ~(1 << src);
        writel(val, &chip->mixer.array->dest_mix_gain_enable[dest]);
        lola_codec_flush(chip);
        return lola_codec_write(chip, chip->mixer.nid, LOLA_VERB_SET_MIX_GAIN,
                                src, dest);
}

#if 0 /* not used */
static int lola_mixer_set_dest_gains(struct lola *chip, unsigned int id,
                                     unsigned int mask, unsigned short *gains)
{
        int i;

        if (!(chip->mixer.dest_mask & (1 << id)) ||
            (chip->mixer.src_mask & mask) != mask)
                return -EINVAL;
        for (i = 0; i < LOLA_MIXER_DIM; i++) {
                if (mask & (1 << i)) {
                        writew(*gains, &chip->mixer.array->dest_mix_gain[id][i]);
                        gains++;
                }
        }
        writel(mask, &chip->mixer.array->dest_mix_gain_enable[id]);
        lola_codec_flush(chip);
        /* update for all dests at once */
        return lola_codec_write(chip, chip->mixer.nid,
                                LOLA_VERB_SET_DESTINATION_GAIN, id, 0);
}
#endif /* not used */

/*
 */

static int set_analog_volume(struct lola *chip, int dir,
                             unsigned int idx, unsigned int val,
                             bool external_call);

int lola_setup_all_analog_gains(struct lola *chip, int dir, bool mute)
{
        struct lola_pin *pin;
        int idx, max_idx;

        pin = chip->pin[dir].pins;
        max_idx = chip->pin[dir].num_pins;
        for (idx = 0; idx < max_idx; idx++) {
                if (pin[idx].is_analog) {
                        unsigned int val = mute ? 0 : pin[idx].cur_gain_step;
                        /* set volume and do not save the value */
                        set_analog_volume(chip, dir, idx, val, false);
                }
        }
        return lola_codec_flush(chip);
}

void lola_save_mixer(struct lola *chip)
{
        /* mute analog output */
        if (chip->mixer.array_saved) {
                /* store contents of mixer array */
                memcpy_fromio(chip->mixer.array_saved, chip->mixer.array,
                              sizeof(*chip->mixer.array));
        }
        lola_setup_all_analog_gains(chip, PLAY, true); /* output mute */
}

void lola_restore_mixer(struct lola *chip)
{
        int i;

        /*lola_reset_setups(chip);*/
        if (chip->mixer.array_saved) {
                /* restore contents of mixer array */
                memcpy_toio(chip->mixer.array, chip->mixer.array_saved,
                            sizeof(*chip->mixer.array));
                /* inform micro-controller about all restored values
                 * and ignore return values
                 */
                for (i = 0; i < chip->mixer.src_phys_ins; i++)
                        lola_codec_write(chip, chip->mixer.nid,
                                         LOLA_VERB_SET_SOURCE_GAIN,
                                         i, 0);
                for (i = 0; i < chip->mixer.src_stream_outs; i++)
                        lola_codec_write(chip, chip->mixer.nid,
                                         LOLA_VERB_SET_SOURCE_GAIN,
                                         chip->mixer.src_stream_out_ofs + i, 0);
                for (i = 0; i < chip->mixer.dest_stream_ins; i++)
                        lola_codec_write(chip, chip->mixer.nid,
                                         LOLA_VERB_SET_DESTINATION_GAIN,
                                         i, 0);
                for (i = 0; i < chip->mixer.dest_phys_outs; i++)
                        lola_codec_write(chip, chip->mixer.nid,
                                         LOLA_VERB_SET_DESTINATION_GAIN,
                                         chip->mixer.dest_phys_out_ofs + i, 0);
                lola_codec_flush(chip);
        }
}

/*
 */

static int set_analog_volume(struct lola *chip, int dir,
                             unsigned int idx, unsigned int val,
                             bool external_call)
{
        struct lola_pin *pin;
        int err;

        if (idx >= chip->pin[dir].num_pins)
                return -EINVAL;
        pin = &chip->pin[dir].pins[idx];
        if (!pin->is_analog || pin->amp_num_steps <= val)
                return -EINVAL;
        if (external_call && pin->cur_gain_step == val)
                return 0;
        if (external_call)
                lola_codec_flush(chip);
        dev_dbg(chip->card->dev,
                "set_analog_volume (dir=%d idx=%d, volume=%d)\n",
                        dir, idx, val);
        err = lola_codec_write(chip, pin->nid,
                               LOLA_VERB_SET_AMP_GAIN_MUTE, val, 0);
        if (err < 0)
                return err;
        if (external_call)
                pin->cur_gain_step = val;
        return 0;
}

int lola_set_src_config(struct lola *chip, unsigned int src_mask, bool update)
{
        int ret = 0;
        int success = 0;
        int n, err;

        /* SRC can be activated and the dwInputSRCMask is valid? */
        if ((chip->input_src_caps_mask & src_mask) != src_mask)
                return -EINVAL;
        /* handle all even Inputs - SRC is a stereo setting !!! */
        for (n = 0; n < chip->pin[CAPT].num_pins; n += 2) {
                unsigned int mask = 3U << n; /* handle the stereo case */
                unsigned int new_src, src_state;
                if (!(chip->input_src_caps_mask & mask))
                        continue;
                /* if one IO needs SRC, both stereo IO will get SRC */
                new_src = (src_mask & mask) != 0;
                if (update) {
                        src_state = (chip->input_src_mask & mask) != 0;
                        if (src_state == new_src)
                                continue;   /* nothing to change for this IO */
                }
                err = lola_codec_write(chip, chip->pcm[CAPT].streams[n].nid,
                                       LOLA_VERB_SET_SRC, new_src, 0);
                if (!err)
                        success++;
                else
                        ret = err;
        }
        if (success)
                ret = lola_codec_flush(chip);
        if (!ret)
                chip->input_src_mask = src_mask;
        return ret;
}

/*
 */
static int init_mixer_values(struct lola *chip)
{
        int i;

        /* all sample rate converters on */
        lola_set_src_config(chip, (1 << chip->pin[CAPT].num_pins) - 1, false);

        /* clear all mixer matrix settings */
        memset_io(chip->mixer.array, 0, sizeof(*chip->mixer.array));
        /* inform firmware about all updated matrix columns - capture part */
        for (i = 0; i < chip->mixer.dest_stream_ins; i++)
                lola_codec_write(chip, chip->mixer.nid,
                                 LOLA_VERB_SET_DESTINATION_GAIN,
                                 i, 0);
        /* inform firmware about all updated matrix columns - output part */
        for (i = 0; i < chip->mixer.dest_phys_outs; i++)
                lola_codec_write(chip, chip->mixer.nid,
                                 LOLA_VERB_SET_DESTINATION_GAIN,
                                 chip->mixer.dest_phys_out_ofs + i, 0);

        /* set all digital input source (master) gains to 0dB */
        for (i = 0; i < chip->mixer.src_phys_ins; i++)
                lola_mixer_set_src_gain(chip, i, 336, true); /* 0dB */

        /* set all digital playback source (master) gains to 0dB */
        for (i = 0; i < chip->mixer.src_stream_outs; i++)
                lola_mixer_set_src_gain(chip,
                                        i + chip->mixer.src_stream_out_ofs,
                                        336, true); /* 0dB */
        /* set gain value 0dB diagonally in matrix - part INPUT -> CAPTURE */
        for (i = 0; i < chip->mixer.dest_stream_ins; i++) {
                int src = i % chip->mixer.src_phys_ins;
                lola_mixer_set_mapping_gain(chip, src, i, 336, true);
        }
        /* set gain value 0dB diagonally in matrix , part PLAYBACK -> OUTPUT
         * (LoLa280 : playback channel 0,2,4,6 linked to output channel 0)
         * (LoLa280 : playback channel 1,3,5,7 linked to output channel 1)
         */
        for (i = 0; i < chip->mixer.src_stream_outs; i++) {
                int src = chip->mixer.src_stream_out_ofs + i;
                int dst = chip->mixer.dest_phys_out_ofs +
                        i % chip->mixer.dest_phys_outs;
                lola_mixer_set_mapping_gain(chip, src, dst, 336, true);
        }
        return 0;
}

/*
 * analog mixer control element
 */
static int lola_analog_vol_info(struct snd_kcontrol *kcontrol,
                                struct snd_ctl_elem_info *uinfo)
{
        struct lola *chip = snd_kcontrol_chip(kcontrol);
        int dir = kcontrol->private_value;

        uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
        uinfo->count = chip->pin[dir].num_pins;
        uinfo->value.integer.min = 0;
        uinfo->value.integer.max = chip->pin[dir].pins[0].amp_num_steps;
        return 0;
}

static int lola_analog_vol_get(struct snd_kcontrol *kcontrol,
                               struct snd_ctl_elem_value *ucontrol)
{
        struct lola *chip = snd_kcontrol_chip(kcontrol);
        int dir = kcontrol->private_value;
        int i;

        for (i = 0; i < chip->pin[dir].num_pins; i++)
                ucontrol->value.integer.value[i] =
                        chip->pin[dir].pins[i].cur_gain_step;
        return 0;
}

static int lola_analog_vol_put(struct snd_kcontrol *kcontrol,
                               struct snd_ctl_elem_value *ucontrol)
{
        struct lola *chip = snd_kcontrol_chip(kcontrol);
        int dir = kcontrol->private_value;
        int i, err;

        for (i = 0; i < chip->pin[dir].num_pins; i++) {
                err = set_analog_volume(chip, dir, i,
                                        ucontrol->value.integer.value[i],
                                        true);
                if (err < 0)
                        return err;
        }
        return 0;
}

static int lola_analog_vol_tlv(struct snd_kcontrol *kcontrol, int op_flag,
                               unsigned int size, unsigned int __user *tlv)
{
        struct lola *chip = snd_kcontrol_chip(kcontrol);
        int dir = kcontrol->private_value;
        unsigned int val1, val2;
        struct lola_pin *pin;

        if (size < 4 * sizeof(unsigned int))
                return -ENOMEM;
        pin = &chip->pin[dir].pins[0];

        val2 = pin->amp_step_size * 25;
        val1 = -1 * (int)pin->amp_offset * (int)val2;
#ifdef TLV_DB_SCALE_MUTE
        val2 |= TLV_DB_SCALE_MUTE;
#endif
        if (put_user(SNDRV_CTL_TLVT_DB_SCALE, tlv))
                return -EFAULT;
        if (put_user(2 * sizeof(unsigned int), tlv + 1))
                return -EFAULT;
        if (put_user(val1, tlv + 2))
                return -EFAULT;
        if (put_user(val2, tlv + 3))
                return -EFAULT;
        return 0;
}

static struct snd_kcontrol_new lola_analog_mixer = {
        .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
        .access = (SNDRV_CTL_ELEM_ACCESS_READWRITE |
                   SNDRV_CTL_ELEM_ACCESS_TLV_READ |
                   SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK),
        .info = lola_analog_vol_info,
        .get = lola_analog_vol_get,
        .put = lola_analog_vol_put,
        .tlv.c = lola_analog_vol_tlv,
};

static int create_analog_mixer(struct lola *chip, int dir, char *name)
{
        if (!chip->pin[dir].num_pins)
                return 0;
        /* no analog volumes on digital only adapters */
        if (chip->pin[dir].num_pins != chip->pin[dir].num_analog_pins)
                return 0;
        lola_analog_mixer.name = name;
        lola_analog_mixer.private_value = dir;
        return snd_ctl_add(chip->card,
                           snd_ctl_new1(&lola_analog_mixer, chip));
}

/*
 * Hardware sample rate converter on digital input
 */
static int lola_input_src_info(struct snd_kcontrol *kcontrol,
                               struct snd_ctl_elem_info *uinfo)
{
        struct lola *chip = snd_kcontrol_chip(kcontrol);

        uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN;
        uinfo->count = chip->pin[CAPT].num_pins;
        uinfo->value.integer.min = 0;
        uinfo->value.integer.max = 1;
        return 0;
}

static int lola_input_src_get(struct snd_kcontrol *kcontrol,
                              struct snd_ctl_elem_value *ucontrol)
{
        struct lola *chip = snd_kcontrol_chip(kcontrol);
        int i;

        for (i = 0; i < chip->pin[CAPT].num_pins; i++)
                ucontrol->value.integer.value[i] =
                        !!(chip->input_src_mask & (1 << i));
        return 0;
}

static int lola_input_src_put(struct snd_kcontrol *kcontrol,
                              struct snd_ctl_elem_value *ucontrol)
{
        struct lola *chip = snd_kcontrol_chip(kcontrol);
        int i;
        unsigned int mask;

        mask = 0;
        for (i = 0; i < chip->pin[CAPT].num_pins; i++)
                if (ucontrol->value.integer.value[i])
                        mask |= 1 << i;
        return lola_set_src_config(chip, mask, true);
}

static struct snd_kcontrol_new lola_input_src_mixer = {
        .name = "Digital SRC Capture Switch",
        .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
        .info = lola_input_src_info,
        .get = lola_input_src_get,
        .put = lola_input_src_put,
};

/*
 * Lola16161 or Lola881 can have Hardware sample rate converters
 * on its digital input pins
 */
static int create_input_src_mixer(struct lola *chip)
{
        if (!chip->input_src_caps_mask)
                return 0;

        return snd_ctl_add(chip->card,
                           snd_ctl_new1(&lola_input_src_mixer, chip));
}

/*
 * src gain mixer
 */
static int lola_src_gain_info(struct snd_kcontrol *kcontrol,
                              struct snd_ctl_elem_info *uinfo)
{
        unsigned int count = (kcontrol->private_value >> 8) & 0xff;

        uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
        uinfo->count = count;
        uinfo->value.integer.min = 0;
        uinfo->value.integer.max = 409;
        return 0;
}

static int lola_src_gain_get(struct snd_kcontrol *kcontrol,
                             struct snd_ctl_elem_value *ucontrol)
{
        struct lola *chip = snd_kcontrol_chip(kcontrol);
        unsigned int ofs = kcontrol->private_value & 0xff;
        unsigned int count = (kcontrol->private_value >> 8) & 0xff;
        unsigned int mask, i;

        mask = readl(&chip->mixer.array->src_gain_enable);
        for (i = 0; i < count; i++) {
                unsigned int idx = ofs + i;
                unsigned short val;
                if (!(chip->mixer.src_mask & (1 << idx)))
                        return -EINVAL;
                if (mask & (1 << idx))
                        val = readw(&chip->mixer.array->src_gain[idx]) + 1;
                else
                        val = 0;
                ucontrol->value.integer.value[i] = val;
        }
        return 0;
}

static int lola_src_gain_put(struct snd_kcontrol *kcontrol,
                             struct snd_ctl_elem_value *ucontrol)
{
        struct lola *chip = snd_kcontrol_chip(kcontrol);
        unsigned int ofs = kcontrol->private_value & 0xff;
        unsigned int count = (kcontrol->private_value >> 8) & 0xff;
        int i, err;

        for (i = 0; i < count; i++) {
                unsigned int idx = ofs + i;
                unsigned short val = ucontrol->value.integer.value[i];
                if (val)
                        val--;
                err = lola_mixer_set_src_gain(chip, idx, val, !!val);
                if (err < 0)
                        return err;
        }
        return 0;
}

/* raw value: 0 = -84dB, 336 = 0dB, 408=18dB, incremented 1 for mute */
static const DECLARE_TLV_DB_SCALE(lola_src_gain_tlv, -8425, 25, 1);

static struct snd_kcontrol_new lola_src_gain_mixer = {
        .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
        .access = (SNDRV_CTL_ELEM_ACCESS_READWRITE |
                   SNDRV_CTL_ELEM_ACCESS_TLV_READ),
        .info = lola_src_gain_info,
        .get = lola_src_gain_get,
        .put = lola_src_gain_put,
        .tlv.p = lola_src_gain_tlv,
};

static int create_src_gain_mixer(struct lola *chip,
                                 int num, int ofs, char *name)
{
        lola_src_gain_mixer.name = name;
        lola_src_gain_mixer.private_value = ofs + (num << 8);
        return snd_ctl_add(chip->card,
                           snd_ctl_new1(&lola_src_gain_mixer, chip));
}

#if 0 /* not used */
/*
 * destination gain (matrix-like) mixer
 */
static int lola_dest_gain_info(struct snd_kcontrol *kcontrol,
                               struct snd_ctl_elem_info *uinfo)
{
        unsigned int src_num = (kcontrol->private_value >> 8) & 0xff;

        uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
        uinfo->count = src_num;
        uinfo->value.integer.min = 0;
        uinfo->value.integer.max = 433;
        return 0;
}

static int lola_dest_gain_get(struct snd_kcontrol *kcontrol,
                              struct snd_ctl_elem_value *ucontrol)
{
        struct lola *chip = snd_kcontrol_chip(kcontrol);
        unsigned int src_ofs = kcontrol->private_value & 0xff;
        unsigned int src_num = (kcontrol->private_value >> 8) & 0xff;
        unsigned int dst_ofs = (kcontrol->private_value >> 16) & 0xff;
        unsigned int dst, mask, i;

        dst = snd_ctl_get_ioffidx(kcontrol, &ucontrol->id) + dst_ofs;
        mask = readl(&chip->mixer.array->dest_mix_gain_enable[dst]);
        for (i = 0; i < src_num; i++) {
                unsigned int src = src_ofs + i;
                unsigned short val;
                if (!(chip->mixer.src_mask & (1 << src)))
                        return -EINVAL;
                if (mask & (1 << dst))
                        val = readw(&chip->mixer.array->dest_mix_gain[dst][src]) + 1;
                else
                        val = 0;
                ucontrol->value.integer.value[i] = val;
        }
        return 0;
}

static int lola_dest_gain_put(struct snd_kcontrol *kcontrol,
                              struct snd_ctl_elem_value *ucontrol)
{
        struct lola *chip = snd_kcontrol_chip(kcontrol);
        unsigned int src_ofs = kcontrol->private_value & 0xff;
        unsigned int src_num = (kcontrol->private_value >> 8) & 0xff;
        unsigned int dst_ofs = (kcontrol->private_value >> 16) & 0xff;
        unsigned int dst, mask;
        unsigned short gains[MAX_STREAM_COUNT];
        int i, num;

        mask = 0;
        num = 0;
        for (i = 0; i < src_num; i++) {
                unsigned short val = ucontrol->value.integer.value[i];
                if (val) {
                        gains[num++] = val - 1;
                        mask |= 1 << i;
                }
        }
        mask <<= src_ofs;
        dst = snd_ctl_get_ioffidx(kcontrol, &ucontrol->id) + dst_ofs;
        return lola_mixer_set_dest_gains(chip, dst, mask, gains);
}

static const DECLARE_TLV_DB_SCALE(lola_dest_gain_tlv, -8425, 25, 1);

static struct snd_kcontrol_new lola_dest_gain_mixer = {
        .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
        .access = (SNDRV_CTL_ELEM_ACCESS_READWRITE |
                   SNDRV_CTL_ELEM_ACCESS_TLV_READ),
        .info = lola_dest_gain_info,
        .get = lola_dest_gain_get,
        .put = lola_dest_gain_put,
        .tlv.p = lola_dest_gain_tlv,
};

static int create_dest_gain_mixer(struct lola *chip,
                                  int src_num, int src_ofs,
                                  int num, int ofs, char *name)
{
        lola_dest_gain_mixer.count = num;
        lola_dest_gain_mixer.name = name;
        lola_dest_gain_mixer.private_value =
                src_ofs + (src_num << 8) + (ofs << 16) + (num << 24);
        return snd_ctl_add(chip->card,
                          snd_ctl_new1(&lola_dest_gain_mixer, chip));
}
#endif /* not used */

/*
 */
int lola_create_mixer(struct lola *chip)
{
        int err;

        err = create_analog_mixer(chip, PLAY, "Analog Playback Volume");
        if (err < 0)
                return err;
        err = create_analog_mixer(chip, CAPT, "Analog Capture Volume");
        if (err < 0)
                return err;
        err = create_input_src_mixer(chip);
        if (err < 0)
                return err;
        err = create_src_gain_mixer(chip, chip->mixer.src_phys_ins, 0,
                                    "Digital Capture Volume");
        if (err < 0)
                return err;
        err = create_src_gain_mixer(chip, chip->mixer.src_stream_outs,
                                    chip->mixer.src_stream_out_ofs,
                                    "Digital Playback Volume");
        if (err < 0)
                return err;
#if 0
/* FIXME: buggy mixer matrix handling */
        err = create_dest_gain_mixer(chip,
                                     chip->mixer.src_phys_ins, 0,
                                     chip->mixer.dest_stream_ins, 0,
                                     "Line Capture Volume");
        if (err < 0)
                return err;
        err = create_dest_gain_mixer(chip,
                                     chip->mixer.src_stream_outs,
                                     chip->mixer.src_stream_out_ofs,
                                     chip->mixer.dest_stream_ins, 0,
                                     "Stream-Loopback Capture Volume");
        if (err < 0)
                return err;
        err = create_dest_gain_mixer(chip,
                                     chip->mixer.src_phys_ins, 0,
                                     chip->mixer.dest_phys_outs,
                                     chip->mixer.dest_phys_out_ofs,
                                     "Line-Loopback Playback Volume");
        if (err < 0)
                return err;
        err = create_dest_gain_mixer(chip,
                                     chip->mixer.src_stream_outs,
                                     chip->mixer.src_stream_out_ofs,
                                     chip->mixer.dest_phys_outs,
                                     chip->mixer.dest_phys_out_ofs,
                                     "Stream Playback Volume");
        if (err < 0)
                return err;
#endif /* FIXME */
        return init_mixer_values(chip);
}