/* * 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 * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA * 02111-1307 USA */ #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 "ivtv-driver.h" #include "ivtv-version.h" #include "ivtv-alsa.h" #include "ivtv-alsa-mixer.h" #include "ivtv-alsa-pcm.h" int ivtv_alsa_debug; #define IVTV_DEBUG_ALSA_INFO(fmt, arg...) \ do { \ if (ivtv_alsa_debug & 2) \ pr_info("%s: " fmt, "ivtv-alsa", ## 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_AUTHOR("Andy Walls"); MODULE_DESCRIPTION("CX23415/CX23416 ALSA Interface"); MODULE_SUPPORTED_DEVICE("CX23415/CX23416 MPEG2 encoder"); 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 */ strlcpy(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; /* 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 */ ret = snd_card_new(&itv->pdev->dev, SNDRV_DEFAULT_IDX1, /* use first available id */ 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: mixer, PCM, & proc files */ #if 0 ret = snd_ivtv_mixer_create(itvsc); if (ret) { IVTV_ALSA_WARN("%s: snd_ivtv_mixer_create() failed with err %d:" " proceeding anyway\n", __func__, ret); } #endif 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; } 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 == NULL) { IVTV_DEBUG_ALSA_INFO("%s: PCM stream for card is disabled - " "skipping\n", __func__); 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("%s: created ivtv ALSA interface instance " "\n", __func__); } 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);