diff options
Diffstat (limited to 'drivers/media/pci/cobalt/cobalt-alsa-main.c')
| -rw-r--r-- | drivers/media/pci/cobalt/cobalt-alsa-main.c | 162 |
1 files changed, 162 insertions, 0 deletions
diff --git a/drivers/media/pci/cobalt/cobalt-alsa-main.c b/drivers/media/pci/cobalt/cobalt-alsa-main.c new file mode 100644 index 000000000..720e3ad93 --- /dev/null +++ b/drivers/media/pci/cobalt/cobalt-alsa-main.c @@ -0,0 +1,162 @@ +/* + * ALSA interface to cobalt PCM capture streams + * + * Copyright 2014-2015 Cisco Systems, Inc. and/or its affiliates. + * All rights reserved. + * + * This program is free software; you may redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; version 2 of the License. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, + * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF + * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND + * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS + * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN + * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN + * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE + * SOFTWARE. + */ + +#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 "cobalt-driver.h" +#include "cobalt-alsa.h" +#include "cobalt-alsa-pcm.h" + +static void snd_cobalt_card_free(struct snd_cobalt_card *cobsc) +{ + if (cobsc == NULL) + return; + + cobsc->s->alsa = NULL; + + kfree(cobsc); +} + +static void snd_cobalt_card_private_free(struct snd_card *sc) +{ + if (sc == NULL) + return; + snd_cobalt_card_free(sc->private_data); + sc->private_data = NULL; + sc->private_free = NULL; +} + +static int snd_cobalt_card_create(struct cobalt_stream *s, + struct snd_card *sc, + struct snd_cobalt_card **cobsc) +{ + *cobsc = kzalloc(sizeof(struct snd_cobalt_card), GFP_KERNEL); + if (*cobsc == NULL) + return -ENOMEM; + + (*cobsc)->s = s; + (*cobsc)->sc = sc; + + sc->private_data = *cobsc; + sc->private_free = snd_cobalt_card_private_free; + + return 0; +} + +static int snd_cobalt_card_set_names(struct snd_cobalt_card *cobsc) +{ + struct cobalt_stream *s = cobsc->s; + struct cobalt *cobalt = s->cobalt; + struct snd_card *sc = cobsc->sc; + + /* sc->driver is used by alsa-lib's configurator: simple, unique */ + strlcpy(sc->driver, "cobalt", sizeof(sc->driver)); + + /* sc->shortname is a symlink in /proc/asound: COBALT-M -> cardN */ + snprintf(sc->shortname, sizeof(sc->shortname), "cobalt-%d-%d", + cobalt->instance, s->video_channel); + + /* sc->longname is read from /proc/asound/cards */ + snprintf(sc->longname, sizeof(sc->longname), + "Cobalt %d HDMI %d", + cobalt->instance, s->video_channel); + + return 0; +} + +int cobalt_alsa_init(struct cobalt_stream *s) +{ + struct cobalt *cobalt = s->cobalt; + struct snd_card *sc = NULL; + struct snd_cobalt_card *cobsc; + 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 cobalt->instance */ + + /* (2) Create a card instance */ + ret = snd_card_new(&cobalt->pci_dev->dev, SNDRV_DEFAULT_IDX1, + SNDRV_DEFAULT_STR1, THIS_MODULE, 0, &sc); + if (ret) { + cobalt_err("snd_card_new() failed with err %d\n", ret); + goto err_exit; + } + + /* (3) Create a main component */ + ret = snd_cobalt_card_create(s, sc, &cobsc); + if (ret) { + cobalt_err("snd_cobalt_card_create() failed with err %d\n", + ret); + goto err_exit_free; + } + + /* (4) Set the driver ID and name strings */ + snd_cobalt_card_set_names(cobsc); + + ret = snd_cobalt_pcm_create(cobsc); + if (ret) { + cobalt_err("snd_cobalt_pcm_create() failed with err %d\n", + 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 */ + s->alsa = cobsc; + + /* (6) Register the card instance */ + ret = snd_card_register(sc); + if (ret) { + s->alsa = NULL; + cobalt_err("snd_card_register() failed with err %d\n", ret); + goto err_exit_free; + } + + return 0; + +err_exit_free: + if (sc != NULL) + snd_card_free(sc); + kfree(cobsc); +err_exit: + return ret; +} + +void cobalt_alsa_exit(struct cobalt_stream *s) +{ + struct snd_cobalt_card *cobsc = s->alsa; + + if (cobsc) + snd_card_free(cobsc->sc); + s->alsa = NULL; +} |