/* * ALSA interface to cx18 PCM capture streams * * Copyright (C) 2009 Andy Walls * Copyright (C) 2009 Devin Heitmueller * * Portions of this work were sponsored by ONELAN Limited. * * 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. */ #include #include #include #include #include #include #include #include #include #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_SUPPORTED_DEVICE("CX23418 MPEG2 encoder"); 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 */ strlcpy(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);