drivers/media/pci/ivtv/ivtv-alsa-main.c - linux - Git at Google

 // 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_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);
	// 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_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);