// SPDX-License-Identifier: GPL-2.0-only
/*
 *  ALSA interface to cobalt PCM capture streams
 *
 *  Copyright 2014-2015 Cisco Systems, Inc. and/or its affiliates.
 *  All rights reserved.
 */

#include <linux/init.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/device.h>
#include <linux/spinlock.h>

#include <media/v4l2-device.h>

#include <sound/core.h>
#include <sound/initval.h>

#include "cobalt-driver.h"
#include "cobalt-alsa.h"
#include "cobalt-alsa-pcm.h"

static void snd_cobalt_card_free(struct snd_cobalt_card *cobsc)
{
        if (cobsc == NULL)
                return;

        cobsc->s->alsa = NULL;

        kfree(cobsc);
}

static void snd_cobalt_card_private_free(struct snd_card *sc)
{
        if (sc == NULL)
                return;
        snd_cobalt_card_free(sc->private_data);
        sc->private_data = NULL;
        sc->private_free = NULL;
}

static int snd_cobalt_card_create(struct cobalt_stream *s,
                                       struct snd_card *sc,
                                       struct snd_cobalt_card **cobsc)
{
        *cobsc = kzalloc_obj(struct snd_cobalt_card);
        if (*cobsc == NULL)
                return -ENOMEM;

        (*cobsc)->s = s;
        (*cobsc)->sc = sc;

        sc->private_data = *cobsc;
        sc->private_free = snd_cobalt_card_private_free;

        return 0;
}

static int snd_cobalt_card_set_names(struct snd_cobalt_card *cobsc)
{
        struct cobalt_stream *s = cobsc->s;
        struct cobalt *cobalt = s->cobalt;
        struct snd_card *sc = cobsc->sc;

        /* sc->driver is used by alsa-lib's configurator: simple, unique */
        strscpy(sc->driver, "cobalt", sizeof(sc->driver));

        /* sc->shortname is a symlink in /proc/asound: COBALT-M -> cardN */
        snprintf(sc->shortname,  sizeof(sc->shortname), "cobalt-%d-%d",
                 cobalt->instance, s->video_channel);

        /* sc->longname is read from /proc/asound/cards */
        snprintf(sc->longname, sizeof(sc->longname),
                 "Cobalt %d HDMI %d",
                 cobalt->instance, s->video_channel);

        return 0;
}

int cobalt_alsa_init(struct cobalt_stream *s)
{
        struct cobalt *cobalt = s->cobalt;
        struct snd_card *sc = NULL;
        struct snd_cobalt_card *cobsc;
        int ret;

        /* Numbrs steps from "Writing an ALSA Driver" by Takashi Iwai */

        /* (1) Check and increment the device index */
        /* This is a no-op for us.  We'll use the cobalt->instance */

        /* (2) Create a card instance */
        ret = snd_card_new(&cobalt->pci_dev->dev, SNDRV_DEFAULT_IDX1,
                           SNDRV_DEFAULT_STR1, THIS_MODULE, 0, &sc);
        if (ret) {
                cobalt_err("snd_card_new() failed with err %d\n", ret);
                goto err_exit;
        }

        /* (3) Create a main component */
        ret = snd_cobalt_card_create(s, sc, &cobsc);
        if (ret) {
                cobalt_err("snd_cobalt_card_create() failed with err %d\n",
                           ret);
                goto err_exit_free;
        }

        /* (4) Set the driver ID and name strings */
        snd_cobalt_card_set_names(cobsc);

        ret = snd_cobalt_pcm_create(cobsc);
        if (ret) {
                cobalt_err("snd_cobalt_pcm_create() failed with err %d\n",
                           ret);
                goto err_exit_free;
        }
        /* FIXME - proc files */

        /* (7) Set the driver data and return 0 */
        /* We do this out of normal order for PCI drivers to avoid races */
        s->alsa = cobsc;

        /* (6) Register the card instance */
        ret = snd_card_register(sc);
        if (ret) {
                s->alsa = NULL;
                cobalt_err("snd_card_register() failed with err %d\n", ret);
                goto err_exit_free;
        }

        return 0;

err_exit_free:
        if (sc != NULL)
                snd_card_free(sc);
        kfree(cobsc);
err_exit:
        return ret;
}

void cobalt_alsa_exit(struct cobalt_stream *s)
{
        struct snd_cobalt_card *cobsc = s->alsa;

        if (cobsc)
                snd_card_free(cobsc->sc);
        s->alsa = NULL;
}