forked from 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.
280 lines
6.4 KiB
280 lines
6.4 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
|
/* |
|
* ALSA interface to cx18 PCM capture streams |
|
* |
|
* Copyright (C) 2009 Andy Walls <[email protected]> |
|
* Copyright (C) 2009 Devin Heitmueller <[email protected]> |
|
* |
|
* Portions of this work were sponsored by ONELAN Limited. |
|
*/ |
|
|
|
#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 "cx18-driver.h" |
|
#include "cx18-version.h" |
|
#include "cx18-alsa.h" |
|
#include "cx18-alsa-pcm.h" |
|
|
|
int cx18_alsa_debug; |
|
|
|
#define CX18_DEBUG_ALSA_INFO(fmt, arg...) \ |
|
do { \ |
|
if (cx18_alsa_debug & 2) \ |
|
printk(KERN_INFO "%s: " fmt, "cx18-alsa", ## arg); \ |
|
} while (0); |
|
|
|
module_param_named(debug, cx18_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_AUTHOR("Andy Walls"); |
|
MODULE_DESCRIPTION("CX23418 ALSA Interface"); |
|
MODULE_LICENSE("GPL"); |
|
|
|
MODULE_VERSION(CX18_VERSION); |
|
|
|
static inline |
|
struct snd_cx18_card *to_snd_cx18_card(struct v4l2_device *v4l2_dev) |
|
{ |
|
return to_cx18(v4l2_dev)->alsa; |
|
} |
|
|
|
static inline |
|
struct snd_cx18_card *p_to_snd_cx18_card(struct v4l2_device **v4l2_dev) |
|
{ |
|
return container_of(v4l2_dev, struct snd_cx18_card, v4l2_dev); |
|
} |
|
|
|
static void snd_cx18_card_free(struct snd_cx18_card *cxsc) |
|
{ |
|
if (cxsc == NULL) |
|
return; |
|
|
|
if (cxsc->v4l2_dev != NULL) |
|
to_cx18(cxsc->v4l2_dev)->alsa = NULL; |
|
|
|
/* FIXME - take any other stopping actions needed */ |
|
|
|
kfree(cxsc); |
|
} |
|
|
|
static void snd_cx18_card_private_free(struct snd_card *sc) |
|
{ |
|
if (sc == NULL) |
|
return; |
|
snd_cx18_card_free(sc->private_data); |
|
sc->private_data = NULL; |
|
sc->private_free = NULL; |
|
} |
|
|
|
static int snd_cx18_card_create(struct v4l2_device *v4l2_dev, |
|
struct snd_card *sc, |
|
struct snd_cx18_card **cxsc) |
|
{ |
|
*cxsc = kzalloc(sizeof(struct snd_cx18_card), GFP_KERNEL); |
|
if (*cxsc == NULL) |
|
return -ENOMEM; |
|
|
|
(*cxsc)->v4l2_dev = v4l2_dev; |
|
(*cxsc)->sc = sc; |
|
|
|
sc->private_data = *cxsc; |
|
sc->private_free = snd_cx18_card_private_free; |
|
|
|
return 0; |
|
} |
|
|
|
static int snd_cx18_card_set_names(struct snd_cx18_card *cxsc) |
|
{ |
|
struct cx18 *cx = to_cx18(cxsc->v4l2_dev); |
|
struct snd_card *sc = cxsc->sc; |
|
|
|
/* sc->driver is used by alsa-lib's configurator: simple, unique */ |
|
strscpy(sc->driver, "CX23418", sizeof(sc->driver)); |
|
|
|
/* sc->shortname is a symlink in /proc/asound: CX18-M -> cardN */ |
|
snprintf(sc->shortname, sizeof(sc->shortname), "CX18-%d", |
|
cx->instance); |
|
|
|
/* sc->longname is read from /proc/asound/cards */ |
|
snprintf(sc->longname, sizeof(sc->longname), |
|
"CX23418 #%d %s TV/FM Radio/Line-In Capture", |
|
cx->instance, cx->card_name); |
|
|
|
return 0; |
|
} |
|
|
|
static int snd_cx18_init(struct v4l2_device *v4l2_dev) |
|
{ |
|
struct cx18 *cx = to_cx18(v4l2_dev); |
|
struct snd_card *sc = NULL; |
|
struct snd_cx18_card *cxsc; |
|
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 cx->instance */ |
|
|
|
/* (2) Create a card instance */ |
|
ret = snd_card_new(&cx->pci_dev->dev, |
|
SNDRV_DEFAULT_IDX1, /* use first available id */ |
|
SNDRV_DEFAULT_STR1, /* xid from end of shortname*/ |
|
THIS_MODULE, 0, &sc); |
|
if (ret) { |
|
CX18_ALSA_ERR("%s: snd_card_new() failed with err %d\n", |
|
__func__, ret); |
|
goto err_exit; |
|
} |
|
|
|
/* (3) Create a main component */ |
|
ret = snd_cx18_card_create(v4l2_dev, sc, &cxsc); |
|
if (ret) { |
|
CX18_ALSA_ERR("%s: snd_cx18_card_create() failed with err %d\n", |
|
__func__, ret); |
|
goto err_exit_free; |
|
} |
|
|
|
/* (4) Set the driver ID and name strings */ |
|
snd_cx18_card_set_names(cxsc); |
|
|
|
|
|
ret = snd_cx18_pcm_create(cxsc); |
|
if (ret) { |
|
CX18_ALSA_ERR("%s: snd_cx18_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 */ |
|
cx->alsa = cxsc; |
|
|
|
/* (6) Register the card instance */ |
|
ret = snd_card_register(sc); |
|
if (ret) { |
|
cx->alsa = NULL; |
|
CX18_ALSA_ERR("%s: snd_card_register() failed with err %d\n", |
|
__func__, ret); |
|
goto err_exit_free; |
|
} |
|
|
|
return 0; |
|
|
|
err_exit_free: |
|
if (sc != NULL) |
|
snd_card_free(sc); |
|
kfree(cxsc); |
|
err_exit: |
|
return ret; |
|
} |
|
|
|
static int cx18_alsa_load(struct cx18 *cx) |
|
{ |
|
struct v4l2_device *v4l2_dev = &cx->v4l2_dev; |
|
struct cx18_stream *s; |
|
|
|
if (v4l2_dev == NULL) { |
|
printk(KERN_ERR "cx18-alsa: %s: struct v4l2_device * is NULL\n", |
|
__func__); |
|
return 0; |
|
} |
|
|
|
cx = to_cx18(v4l2_dev); |
|
if (cx == NULL) { |
|
printk(KERN_ERR "cx18-alsa cx is NULL\n"); |
|
return 0; |
|
} |
|
|
|
s = &cx->streams[CX18_ENC_STREAM_TYPE_PCM]; |
|
if (s->video_dev.v4l2_dev == NULL) { |
|
CX18_DEBUG_ALSA_INFO("%s: PCM stream for card is disabled - skipping\n", |
|
__func__); |
|
return 0; |
|
} |
|
|
|
if (cx->alsa != NULL) { |
|
CX18_ALSA_ERR("%s: struct snd_cx18_card * already exists\n", |
|
__func__); |
|
return 0; |
|
} |
|
|
|
if (snd_cx18_init(v4l2_dev)) { |
|
CX18_ALSA_ERR("%s: failed to create struct snd_cx18_card\n", |
|
__func__); |
|
} else { |
|
CX18_DEBUG_ALSA_INFO("%s: created cx18 ALSA interface instance\n", |
|
__func__); |
|
} |
|
return 0; |
|
} |
|
|
|
static int __init cx18_alsa_init(void) |
|
{ |
|
printk(KERN_INFO "cx18-alsa: module loading...\n"); |
|
cx18_ext_init = &cx18_alsa_load; |
|
return 0; |
|
} |
|
|
|
static void __exit snd_cx18_exit(struct snd_cx18_card *cxsc) |
|
{ |
|
struct cx18 *cx = to_cx18(cxsc->v4l2_dev); |
|
|
|
/* FIXME - pointer checks & shutdown cxsc */ |
|
|
|
snd_card_free(cxsc->sc); |
|
cx->alsa = NULL; |
|
} |
|
|
|
static int __exit cx18_alsa_exit_callback(struct device *dev, void *data) |
|
{ |
|
struct v4l2_device *v4l2_dev = dev_get_drvdata(dev); |
|
struct snd_cx18_card *cxsc; |
|
|
|
if (v4l2_dev == NULL) { |
|
printk(KERN_ERR "cx18-alsa: %s: struct v4l2_device * is NULL\n", |
|
__func__); |
|
return 0; |
|
} |
|
|
|
cxsc = to_snd_cx18_card(v4l2_dev); |
|
if (cxsc == NULL) { |
|
CX18_ALSA_WARN("%s: struct snd_cx18_card * is NULL\n", |
|
__func__); |
|
return 0; |
|
} |
|
|
|
snd_cx18_exit(cxsc); |
|
return 0; |
|
} |
|
|
|
static void __exit cx18_alsa_exit(void) |
|
{ |
|
struct device_driver *drv; |
|
int ret; |
|
|
|
printk(KERN_INFO "cx18-alsa: module unloading...\n"); |
|
|
|
drv = driver_find("cx18", &pci_bus_type); |
|
ret = driver_for_each_device(drv, NULL, NULL, cx18_alsa_exit_callback); |
|
(void)ret; /* suppress compiler warning */ |
|
|
|
cx18_ext_init = NULL; |
|
printk(KERN_INFO "cx18-alsa: module unload complete\n"); |
|
} |
|
|
|
module_init(cx18_alsa_init); |
|
module_exit(cx18_alsa_exit);
|
|
|