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The cobalt device is a PCIe card with 4 HDMI inputs (adv7604) and a connector that can be used to hook up an adv7511 transmitter or an adv7842 receiver daughterboard. This device is used within Cisco but is sadly not available outside of Cisco. Nevertheless it is a very interesting driver that can serve as an example of how to support HDMI hardware and how to use the popular adv devices. Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
163 lines
4.0 KiB
C
163 lines
4.0 KiB
C
/*
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* ALSA interface to cobalt PCM capture streams
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*
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* Copyright 2014-2015 Cisco Systems, Inc. and/or its affiliates.
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* All rights reserved.
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*
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* This program is free software; you may redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/device.h>
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#include <linux/spinlock.h>
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#include <media/v4l2-device.h>
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#include <sound/core.h>
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#include <sound/initval.h>
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#include "cobalt-driver.h"
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#include "cobalt-alsa.h"
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#include "cobalt-alsa-pcm.h"
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static void snd_cobalt_card_free(struct snd_cobalt_card *cobsc)
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{
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if (cobsc == NULL)
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return;
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cobsc->s->alsa = NULL;
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kfree(cobsc);
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}
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static void snd_cobalt_card_private_free(struct snd_card *sc)
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{
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if (sc == NULL)
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return;
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snd_cobalt_card_free(sc->private_data);
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sc->private_data = NULL;
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sc->private_free = NULL;
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}
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static int snd_cobalt_card_create(struct cobalt_stream *s,
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struct snd_card *sc,
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struct snd_cobalt_card **cobsc)
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{
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*cobsc = kzalloc(sizeof(struct snd_cobalt_card), GFP_KERNEL);
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if (*cobsc == NULL)
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return -ENOMEM;
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(*cobsc)->s = s;
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(*cobsc)->sc = sc;
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sc->private_data = *cobsc;
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sc->private_free = snd_cobalt_card_private_free;
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return 0;
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}
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static int snd_cobalt_card_set_names(struct snd_cobalt_card *cobsc)
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{
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struct cobalt_stream *s = cobsc->s;
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struct cobalt *cobalt = s->cobalt;
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struct snd_card *sc = cobsc->sc;
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/* sc->driver is used by alsa-lib's configurator: simple, unique */
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strlcpy(sc->driver, "cobalt", sizeof(sc->driver));
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/* sc->shortname is a symlink in /proc/asound: COBALT-M -> cardN */
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snprintf(sc->shortname, sizeof(sc->shortname), "cobalt-%d-%d",
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cobalt->instance, s->video_channel);
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/* sc->longname is read from /proc/asound/cards */
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snprintf(sc->longname, sizeof(sc->longname),
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"Cobalt %d HDMI %d",
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cobalt->instance, s->video_channel);
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return 0;
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}
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int cobalt_alsa_init(struct cobalt_stream *s)
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{
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struct cobalt *cobalt = s->cobalt;
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struct snd_card *sc = NULL;
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struct snd_cobalt_card *cobsc;
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int ret;
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/* Numbrs steps from "Writing an ALSA Driver" by Takashi Iwai */
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/* (1) Check and increment the device index */
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/* This is a no-op for us. We'll use the cobalt->instance */
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/* (2) Create a card instance */
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ret = snd_card_new(&cobalt->pci_dev->dev, SNDRV_DEFAULT_IDX1,
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SNDRV_DEFAULT_STR1, THIS_MODULE, 0, &sc);
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if (ret) {
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cobalt_err("snd_card_new() failed with err %d\n", ret);
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goto err_exit;
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}
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/* (3) Create a main component */
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ret = snd_cobalt_card_create(s, sc, &cobsc);
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if (ret) {
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cobalt_err("snd_cobalt_card_create() failed with err %d\n",
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ret);
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goto err_exit_free;
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}
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/* (4) Set the driver ID and name strings */
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snd_cobalt_card_set_names(cobsc);
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ret = snd_cobalt_pcm_create(cobsc);
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if (ret) {
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cobalt_err("snd_cobalt_pcm_create() failed with err %d\n",
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ret);
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goto err_exit_free;
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}
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/* FIXME - proc files */
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/* (7) Set the driver data and return 0 */
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/* We do this out of normal order for PCI drivers to avoid races */
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s->alsa = cobsc;
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/* (6) Register the card instance */
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ret = snd_card_register(sc);
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if (ret) {
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s->alsa = NULL;
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cobalt_err("snd_card_register() failed with err %d\n", ret);
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goto err_exit_free;
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}
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return 0;
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err_exit_free:
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if (sc != NULL)
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snd_card_free(sc);
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kfree(cobsc);
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err_exit:
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return ret;
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}
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void cobalt_alsa_exit(struct cobalt_stream *s)
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{
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struct snd_cobalt_card *cobsc = s->alsa;
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if (cobsc)
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snd_card_free(cobsc->sc);
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s->alsa = NULL;
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}
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