cobalt-alsa-main.c
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/*
* ALSA interface to cobalt PCM capture streams
*
* Copyright 2014-2015 Cisco Systems, Inc. and/or its affiliates.
* All rights reserved.
*
* This program is free software; you may redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#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(sizeof(struct snd_cobalt_card), GFP_KERNEL);
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 */
strlcpy(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;
}