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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* ALSA interface to ivtv PCM capture streams
*
* Copyright (C) 2009,2012 Andy Walls <awalls@md.metrocast.net>
* Copyright (C) 2009 Devin Heitmueller <dheitmueller@kernellabs.com>
*
* Portions of this work were sponsored by ONELAN Limited for the cx18 driver
*/
#include "ivtv-driver.h"
#include "ivtv-version.h"
#include "ivtv-alsa.h"
#include "ivtv-alsa-pcm.h"
#include <sound/core.h>
#include <sound/initval.h>
int ivtv_alsa_debug;
static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;
#define IVTV_DEBUG_ALSA_INFO(__fmt, __arg...) \
do { \
if (ivtv_alsa_debug & 2) \
printk(KERN_INFO pr_fmt("%s: alsa:" __fmt), \
__func__, ##__arg); \
} while (0)
module_param_named(debug, ivtv_alsa_debug, int, 0644);
MODULE_PARM_DESC(debug,
"Debug level (bitmask). Default: 0\n"
"\t\t\t 1/0x0001: warning\n"
"\t\t\t 2/0x0002: info\n");
module_param_array(index, int, NULL, 0444);
MODULE_PARM_DESC(index,
"Index value for IVTV ALSA capture interface(s).\n");
MODULE_AUTHOR("Andy Walls");
MODULE_DESCRIPTION("CX23415/CX23416 ALSA Interface");
MODULE_SUPPORTED_DEVICE("CX23415/CX23416 MPEG2 encoder");
MODULE_LICENSE("GPL");
MODULE_VERSION(IVTV_VERSION);
static inline
struct snd_ivtv_card *to_snd_ivtv_card(struct v4l2_device *v4l2_dev)
{
return to_ivtv(v4l2_dev)->alsa;
}
static inline
struct snd_ivtv_card *p_to_snd_ivtv_card(struct v4l2_device **v4l2_dev)
{
return container_of(v4l2_dev, struct snd_ivtv_card, v4l2_dev);
}
static void snd_ivtv_card_free(struct snd_ivtv_card *itvsc)
{
if (itvsc == NULL)
return;
if (itvsc->v4l2_dev != NULL)
to_ivtv(itvsc->v4l2_dev)->alsa = NULL;
/* FIXME - take any other stopping actions needed */
kfree(itvsc);
}
static void snd_ivtv_card_private_free(struct snd_card *sc)
{
if (sc == NULL)
return;
snd_ivtv_card_free(sc->private_data);
sc->private_data = NULL;
sc->private_free = NULL;
}
static int snd_ivtv_card_create(struct v4l2_device *v4l2_dev,
struct snd_card *sc,
struct snd_ivtv_card **itvsc)
{
*itvsc = kzalloc(sizeof(struct snd_ivtv_card), GFP_KERNEL);
if (*itvsc == NULL)
return -ENOMEM;
(*itvsc)->v4l2_dev = v4l2_dev;
(*itvsc)->sc = sc;
sc->private_data = *itvsc;
sc->private_free = snd_ivtv_card_private_free;
return 0;
}
static int snd_ivtv_card_set_names(struct snd_ivtv_card *itvsc)
{
struct ivtv *itv = to_ivtv(itvsc->v4l2_dev);
struct snd_card *sc = itvsc->sc;
/* sc->driver is used by alsa-lib's configurator: simple, unique */
strscpy(sc->driver, "CX2341[56]", sizeof(sc->driver));
/* sc->shortname is a symlink in /proc/asound: IVTV-M -> cardN */
snprintf(sc->shortname, sizeof(sc->shortname), "IVTV-%d",
itv->instance);
/* sc->longname is read from /proc/asound/cards */
snprintf(sc->longname, sizeof(sc->longname),
"CX2341[56] #%d %s TV/FM Radio/Line-In Capture",
itv->instance, itv->card_name);
return 0;
}
static int snd_ivtv_init(struct v4l2_device *v4l2_dev)
{
struct ivtv *itv = to_ivtv(v4l2_dev);
struct snd_card *sc = NULL;
struct snd_ivtv_card *itvsc;
int ret, idx;
/* 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 itv->instance */
/* (2) Create a card instance */
/* use first available id if not specified otherwise*/
idx = index[itv->instance] == -1 ? SNDRV_DEFAULT_IDX1 : index[itv->instance];
ret = snd_card_new(&itv->pdev->dev,
idx,
SNDRV_DEFAULT_STR1, /* xid from end of shortname*/
THIS_MODULE, 0, &sc);
if (ret) {
IVTV_ALSA_ERR("%s: snd_card_new() failed with err %d\n",
__func__, ret);
goto err_exit;
}
/* (3) Create a main component */
ret = snd_ivtv_card_create(v4l2_dev, sc, &itvsc);
if (ret) {
IVTV_ALSA_ERR("%s: snd_ivtv_card_create() failed with err %d\n",
__func__, ret);
goto err_exit_free;
}
/* (4) Set the driver ID and name strings */
snd_ivtv_card_set_names(itvsc);
/* (5) Create other components: PCM, & proc files */
ret = snd_ivtv_pcm_create(itvsc);
if (ret) {
IVTV_ALSA_ERR("%s: snd_ivtv_pcm_create() failed with err %d\n",
__func__, 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 */
itv->alsa = itvsc;
/* (6) Register the card instance */
ret = snd_card_register(sc);
if (ret) {
itv->alsa = NULL;
IVTV_ALSA_ERR("%s: snd_card_register() failed with err %d\n",
__func__, ret);
goto err_exit_free;
}
IVTV_ALSA_INFO("%s: Instance %d registered as ALSA card %d\n",
__func__, itv->instance, sc->number);
return 0;
err_exit_free:
if (sc != NULL)
snd_card_free(sc);
kfree(itvsc);
err_exit:
return ret;
}
static int ivtv_alsa_load(struct ivtv *itv)
{
struct v4l2_device *v4l2_dev = &itv->v4l2_dev;
struct ivtv_stream *s;
if (v4l2_dev == NULL) {
pr_err("ivtv-alsa: %s: struct v4l2_device * is NULL\n",
__func__);
return 0;
}
itv = to_ivtv(v4l2_dev);
if (itv == NULL) {
pr_err("ivtv-alsa itv is NULL\n");
return 0;
}
s = &itv->streams[IVTV_ENC_STREAM_TYPE_PCM];
if (s->vdev.v4l2_dev == NULL) {
IVTV_DEBUG_ALSA_INFO("PCM stream for card is disabled - skipping\n");
return 0;
}
if (itv->alsa != NULL) {
IVTV_ALSA_ERR("%s: struct snd_ivtv_card * already exists\n",
__func__);
return 0;
}
if (snd_ivtv_init(v4l2_dev)) {
IVTV_ALSA_ERR("%s: failed to create struct snd_ivtv_card\n",
__func__);
} else {
IVTV_DEBUG_ALSA_INFO("created ivtv ALSA interface instance\n");
}
return 0;
}
static int __init ivtv_alsa_init(void)
{
pr_info("ivtv-alsa: module loading...\n");
ivtv_ext_init = &ivtv_alsa_load;
return 0;
}
static void __exit snd_ivtv_exit(struct snd_ivtv_card *itvsc)
{
struct ivtv *itv = to_ivtv(itvsc->v4l2_dev);
/* FIXME - pointer checks & shutdown itvsc */
snd_card_free(itvsc->sc);
itv->alsa = NULL;
}
static int __exit ivtv_alsa_exit_callback(struct device *dev, void *data)
{
struct v4l2_device *v4l2_dev = dev_get_drvdata(dev);
struct snd_ivtv_card *itvsc;
if (v4l2_dev == NULL) {
pr_err("ivtv-alsa: %s: struct v4l2_device * is NULL\n",
__func__);
return 0;
}
itvsc = to_snd_ivtv_card(v4l2_dev);
if (itvsc == NULL) {
IVTV_ALSA_WARN("%s: struct snd_ivtv_card * is NULL\n",
__func__);
return 0;
}
snd_ivtv_exit(itvsc);
return 0;
}
static void __exit ivtv_alsa_exit(void)
{
struct device_driver *drv;
int ret;
pr_info("ivtv-alsa: module unloading...\n");
drv = driver_find("ivtv", &pci_bus_type);
ret = driver_for_each_device(drv, NULL, NULL, ivtv_alsa_exit_callback);
(void)ret; /* suppress compiler warning */
ivtv_ext_init = NULL;
pr_info("ivtv-alsa: module unload complete\n");
}
module_init(ivtv_alsa_init);
module_exit(ivtv_alsa_exit);
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