275 lines
6.3 KiB
C
275 lines
6.3 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* ALSA interface to cx18 PCM capture streams
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*
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* Copyright (C) 2009 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.
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*/
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/device.h>
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#include <linux/spinlock.h>
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#include <media/v4l2-device.h>
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#include <sound/core.h>
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#include <sound/initval.h>
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#include "cx18-driver.h"
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#include "cx18-version.h"
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#include "cx18-alsa.h"
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#include "cx18-alsa-pcm.h"
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int cx18_alsa_debug;
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#define CX18_DEBUG_ALSA_INFO(fmt, arg...) \
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do { \
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if (cx18_alsa_debug & 2) \
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printk(KERN_INFO "%s: " fmt, "cx18-alsa", ## arg); \
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} while (0);
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module_param_named(debug, cx18_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_AUTHOR("Andy Walls");
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MODULE_DESCRIPTION("CX23418 ALSA Interface");
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MODULE_LICENSE("GPL");
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MODULE_VERSION(CX18_VERSION);
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static inline
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struct snd_cx18_card *to_snd_cx18_card(struct v4l2_device *v4l2_dev)
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{
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return to_cx18(v4l2_dev)->alsa;
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}
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static void snd_cx18_card_free(struct snd_cx18_card *cxsc)
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{
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if (cxsc == NULL)
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return;
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if (cxsc->v4l2_dev != NULL)
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to_cx18(cxsc->v4l2_dev)->alsa = NULL;
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/* FIXME - take any other stopping actions needed */
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kfree(cxsc);
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}
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static void snd_cx18_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_cx18_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_cx18_card_create(struct v4l2_device *v4l2_dev,
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struct snd_card *sc,
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struct snd_cx18_card **cxsc)
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{
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*cxsc = kzalloc(sizeof(struct snd_cx18_card), GFP_KERNEL);
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if (*cxsc == NULL)
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return -ENOMEM;
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(*cxsc)->v4l2_dev = v4l2_dev;
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(*cxsc)->sc = sc;
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sc->private_data = *cxsc;
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sc->private_free = snd_cx18_card_private_free;
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return 0;
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}
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static int snd_cx18_card_set_names(struct snd_cx18_card *cxsc)
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{
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struct cx18 *cx = to_cx18(cxsc->v4l2_dev);
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struct snd_card *sc = cxsc->sc;
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/* sc->driver is used by alsa-lib's configurator: simple, unique */
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strscpy(sc->driver, "CX23418", sizeof(sc->driver));
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/* sc->shortname is a symlink in /proc/asound: CX18-M -> cardN */
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snprintf(sc->shortname, sizeof(sc->shortname), "CX18-%d",
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cx->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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"CX23418 #%d %s TV/FM Radio/Line-In Capture",
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cx->instance, cx->card_name);
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return 0;
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}
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static int snd_cx18_init(struct v4l2_device *v4l2_dev)
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{
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struct cx18 *cx = to_cx18(v4l2_dev);
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struct snd_card *sc = NULL;
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struct snd_cx18_card *cxsc;
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int ret;
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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 cx->instance */
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/* (2) Create a card instance */
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ret = snd_card_new(&cx->pci_dev->dev,
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SNDRV_DEFAULT_IDX1, /* use first available id */
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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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CX18_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_cx18_card_create(v4l2_dev, sc, &cxsc);
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if (ret) {
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CX18_ALSA_ERR("%s: snd_cx18_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_cx18_card_set_names(cxsc);
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ret = snd_cx18_pcm_create(cxsc);
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if (ret) {
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CX18_ALSA_ERR("%s: snd_cx18_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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cx->alsa = cxsc;
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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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cx->alsa = NULL;
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CX18_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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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(cxsc);
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err_exit:
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return ret;
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}
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static int cx18_alsa_load(struct cx18 *cx)
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{
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struct v4l2_device *v4l2_dev = &cx->v4l2_dev;
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struct cx18_stream *s;
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if (v4l2_dev == NULL) {
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printk(KERN_ERR "cx18-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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cx = to_cx18(v4l2_dev);
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if (cx == NULL) {
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printk(KERN_ERR "cx18-alsa cx is NULL\n");
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return 0;
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}
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s = &cx->streams[CX18_ENC_STREAM_TYPE_PCM];
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if (s->video_dev.v4l2_dev == NULL) {
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CX18_DEBUG_ALSA_INFO("%s: PCM stream for card is disabled - skipping\n",
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__func__);
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return 0;
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}
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if (cx->alsa != NULL) {
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CX18_ALSA_ERR("%s: struct snd_cx18_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_cx18_init(v4l2_dev)) {
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CX18_ALSA_ERR("%s: failed to create struct snd_cx18_card\n",
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__func__);
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} else {
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CX18_DEBUG_ALSA_INFO("%s: created cx18 ALSA interface instance\n",
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__func__);
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}
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return 0;
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}
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static int __init cx18_alsa_init(void)
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{
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printk(KERN_INFO "cx18-alsa: module loading...\n");
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cx18_ext_init = &cx18_alsa_load;
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return 0;
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}
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static void __exit snd_cx18_exit(struct snd_cx18_card *cxsc)
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{
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struct cx18 *cx = to_cx18(cxsc->v4l2_dev);
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/* FIXME - pointer checks & shutdown cxsc */
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snd_card_free(cxsc->sc);
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cx->alsa = NULL;
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}
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static int __exit cx18_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_cx18_card *cxsc;
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if (v4l2_dev == NULL) {
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printk(KERN_ERR "cx18-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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cxsc = to_snd_cx18_card(v4l2_dev);
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if (cxsc == NULL) {
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CX18_ALSA_WARN("%s: struct snd_cx18_card * is NULL\n",
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__func__);
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return 0;
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}
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snd_cx18_exit(cxsc);
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return 0;
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}
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static void __exit cx18_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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printk(KERN_INFO "cx18-alsa: module unloading...\n");
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drv = driver_find("cx18", &pci_bus_type);
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ret = driver_for_each_device(drv, NULL, NULL, cx18_alsa_exit_callback);
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(void)ret; /* suppress compiler warning */
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cx18_ext_init = NULL;
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printk(KERN_INFO "cx18-alsa: module unload complete\n");
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}
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module_init(cx18_alsa_init);
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module_exit(cx18_alsa_exit);
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