diff options
Diffstat (limited to 'drivers/media/video/cx18/cx18-alsa-main.c')
-rw-r--r-- | drivers/media/video/cx18/cx18-alsa-main.c | 293 |
1 files changed, 293 insertions, 0 deletions
diff --git a/drivers/media/video/cx18/cx18-alsa-main.c b/drivers/media/video/cx18/cx18-alsa-main.c new file mode 100644 index 0000000..eb41d7e --- /dev/null +++ b/drivers/media/video/cx18/cx18-alsa-main.c @@ -0,0 +1,293 @@ +/* + * ALSA interface to cx18 PCM capture streams + * + * Copyright (C) 2009 Andy Walls <awalls@radix.net> + * Copyright (C) 2009 Devin Heitmueller <dheitmueller@kernellabs.com> + * + * 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. + * + * 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/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 "cx18-driver.h" +#include "cx18-version.h" +#include "cx18-alsa.h" +#include "cx18-alsa-mixer.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_create(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_create() 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); +err_exit: + return ret; +} + +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 == 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); + put_driver(drv); + + cx18_ext_init = NULL; + printk(KERN_INFO "cx18-alsa: module unload complete\n"); +} + +module_init(cx18_alsa_init); +module_exit(cx18_alsa_exit); |