mirror of https://github.com/Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
274 lines
6.5 KiB
274 lines
6.5 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
|
/* |
|
* ALSA interface to ivtv PCM capture streams |
|
* |
|
* Copyright (C) 2009,2012 Andy Walls <[email protected]> |
|
* Copyright (C) 2009 Devin Heitmueller <[email protected]> |
|
* |
|
* 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_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 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);
|
|
|