275 lines
6.5 KiB
C
275 lines
6.5 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* ALSA interface to ivtv PCM capture streams
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*
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* Copyright (C) 2009,2012 Andy Walls <awalls@md.metrocast.net>
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* Copyright (C) 2009 Devin Heitmueller <dheitmueller@kernellabs.com>
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*
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* Portions of this work were sponsored by ONELAN Limited for the cx18 driver
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*/
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#include "ivtv-driver.h"
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#include "ivtv-version.h"
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#include "ivtv-alsa.h"
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#include "ivtv-alsa-pcm.h"
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#include <sound/core.h>
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#include <sound/initval.h>
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int ivtv_alsa_debug;
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static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;
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#define IVTV_DEBUG_ALSA_INFO(__fmt, __arg...) \
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do { \
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if (ivtv_alsa_debug & 2) \
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printk(KERN_INFO pr_fmt("%s: alsa:" __fmt), \
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__func__, ##__arg); \
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} while (0)
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module_param_named(debug, ivtv_alsa_debug, int, 0644);
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MODULE_PARM_DESC(debug,
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"Debug level (bitmask). Default: 0\n"
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"\t\t\t 1/0x0001: warning\n"
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"\t\t\t 2/0x0002: info\n");
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module_param_array(index, int, NULL, 0444);
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MODULE_PARM_DESC(index,
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"Index value for IVTV ALSA capture interface(s).\n");
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MODULE_AUTHOR("Andy Walls");
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MODULE_DESCRIPTION("CX23415/CX23416 ALSA Interface");
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MODULE_LICENSE("GPL");
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MODULE_VERSION(IVTV_VERSION);
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static inline
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struct snd_ivtv_card *to_snd_ivtv_card(struct v4l2_device *v4l2_dev)
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{
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return to_ivtv(v4l2_dev)->alsa;
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}
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static void snd_ivtv_card_free(struct snd_ivtv_card *itvsc)
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{
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if (itvsc == NULL)
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return;
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if (itvsc->v4l2_dev != NULL)
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to_ivtv(itvsc->v4l2_dev)->alsa = NULL;
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/* FIXME - take any other stopping actions needed */
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kfree(itvsc);
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}
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static void snd_ivtv_card_private_free(struct snd_card *sc)
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{
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if (sc == NULL)
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return;
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snd_ivtv_card_free(sc->private_data);
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sc->private_data = NULL;
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sc->private_free = NULL;
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}
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static int snd_ivtv_card_create(struct v4l2_device *v4l2_dev,
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struct snd_card *sc,
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struct snd_ivtv_card **itvsc)
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{
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*itvsc = kzalloc(sizeof(struct snd_ivtv_card), GFP_KERNEL);
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if (*itvsc == NULL)
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return -ENOMEM;
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(*itvsc)->v4l2_dev = v4l2_dev;
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(*itvsc)->sc = sc;
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sc->private_data = *itvsc;
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sc->private_free = snd_ivtv_card_private_free;
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return 0;
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}
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static int snd_ivtv_card_set_names(struct snd_ivtv_card *itvsc)
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{
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struct ivtv *itv = to_ivtv(itvsc->v4l2_dev);
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struct snd_card *sc = itvsc->sc;
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/* sc->driver is used by alsa-lib's configurator: simple, unique */
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strscpy(sc->driver, "CX2341[56]", sizeof(sc->driver));
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/* sc->shortname is a symlink in /proc/asound: IVTV-M -> cardN */
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snprintf(sc->shortname, sizeof(sc->shortname), "IVTV-%d",
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itv->instance);
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/* sc->longname is read from /proc/asound/cards */
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snprintf(sc->longname, sizeof(sc->longname),
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"CX2341[56] #%d %s TV/FM Radio/Line-In Capture",
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itv->instance, itv->card_name);
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return 0;
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}
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static int snd_ivtv_init(struct v4l2_device *v4l2_dev)
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{
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struct ivtv *itv = to_ivtv(v4l2_dev);
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struct snd_card *sc = NULL;
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struct snd_ivtv_card *itvsc;
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int ret, idx;
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/* Numbrs steps from "Writing an ALSA Driver" by Takashi Iwai */
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/* (1) Check and increment the device index */
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/* This is a no-op for us. We'll use the itv->instance */
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/* (2) Create a card instance */
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/* use first available id if not specified otherwise*/
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idx = index[itv->instance] == -1 ? SNDRV_DEFAULT_IDX1 : index[itv->instance];
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ret = snd_card_new(&itv->pdev->dev,
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idx,
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SNDRV_DEFAULT_STR1, /* xid from end of shortname*/
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THIS_MODULE, 0, &sc);
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if (ret) {
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IVTV_ALSA_ERR("%s: snd_card_new() failed with err %d\n",
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__func__, ret);
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goto err_exit;
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}
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/* (3) Create a main component */
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ret = snd_ivtv_card_create(v4l2_dev, sc, &itvsc);
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if (ret) {
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IVTV_ALSA_ERR("%s: snd_ivtv_card_create() failed with err %d\n",
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__func__, ret);
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goto err_exit_free;
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}
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/* (4) Set the driver ID and name strings */
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snd_ivtv_card_set_names(itvsc);
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/* (5) Create other components: PCM, & proc files */
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ret = snd_ivtv_pcm_create(itvsc);
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if (ret) {
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IVTV_ALSA_ERR("%s: snd_ivtv_pcm_create() failed with err %d\n",
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__func__, ret);
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goto err_exit_free;
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}
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/* FIXME - proc files */
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/* (7) Set the driver data and return 0 */
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/* We do this out of normal order for PCI drivers to avoid races */
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itv->alsa = itvsc;
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/* (6) Register the card instance */
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ret = snd_card_register(sc);
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if (ret) {
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itv->alsa = NULL;
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IVTV_ALSA_ERR("%s: snd_card_register() failed with err %d\n",
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__func__, ret);
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goto err_exit_free;
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}
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IVTV_ALSA_INFO("%s: Instance %d registered as ALSA card %d\n",
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__func__, itv->instance, sc->number);
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return 0;
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err_exit_free:
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if (sc != NULL)
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snd_card_free(sc);
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kfree(itvsc);
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err_exit:
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return ret;
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}
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static int ivtv_alsa_load(struct ivtv *itv)
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{
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struct v4l2_device *v4l2_dev = &itv->v4l2_dev;
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struct ivtv_stream *s;
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if (v4l2_dev == NULL) {
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pr_err("ivtv-alsa: %s: struct v4l2_device * is NULL\n",
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__func__);
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return 0;
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}
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itv = to_ivtv(v4l2_dev);
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if (itv == NULL) {
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pr_err("ivtv-alsa itv is NULL\n");
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return 0;
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}
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s = &itv->streams[IVTV_ENC_STREAM_TYPE_PCM];
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if (s->vdev.v4l2_dev == NULL) {
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IVTV_DEBUG_ALSA_INFO("PCM stream for card is disabled - skipping\n");
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return 0;
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}
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if (itv->alsa != NULL) {
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IVTV_ALSA_ERR("%s: struct snd_ivtv_card * already exists\n",
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__func__);
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return 0;
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}
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if (snd_ivtv_init(v4l2_dev)) {
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IVTV_ALSA_ERR("%s: failed to create struct snd_ivtv_card\n",
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__func__);
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} else {
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IVTV_DEBUG_ALSA_INFO("created ivtv ALSA interface instance\n");
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}
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return 0;
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}
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static int __init ivtv_alsa_init(void)
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{
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pr_info("ivtv-alsa: module loading...\n");
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ivtv_ext_init = &ivtv_alsa_load;
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return 0;
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}
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static void __exit snd_ivtv_exit(struct snd_ivtv_card *itvsc)
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{
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struct ivtv *itv = to_ivtv(itvsc->v4l2_dev);
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/* FIXME - pointer checks & shutdown itvsc */
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snd_card_free(itvsc->sc);
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itv->alsa = NULL;
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}
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static int __exit ivtv_alsa_exit_callback(struct device *dev, void *data)
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{
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struct v4l2_device *v4l2_dev = dev_get_drvdata(dev);
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struct snd_ivtv_card *itvsc;
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if (v4l2_dev == NULL) {
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pr_err("ivtv-alsa: %s: struct v4l2_device * is NULL\n",
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__func__);
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return 0;
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}
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itvsc = to_snd_ivtv_card(v4l2_dev);
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if (itvsc == NULL) {
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IVTV_ALSA_WARN("%s: struct snd_ivtv_card * is NULL\n",
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__func__);
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return 0;
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}
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snd_ivtv_exit(itvsc);
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return 0;
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}
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static void __exit ivtv_alsa_exit(void)
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{
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struct device_driver *drv;
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int ret;
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pr_info("ivtv-alsa: module unloading...\n");
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drv = driver_find("ivtv", &pci_bus_type);
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ret = driver_for_each_device(drv, NULL, NULL, ivtv_alsa_exit_callback);
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(void)ret; /* suppress compiler warning */
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ivtv_ext_init = NULL;
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pr_info("ivtv-alsa: module unload complete\n");
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}
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module_init(ivtv_alsa_init);
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module_exit(ivtv_alsa_exit);
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