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c0decac19d
The implementation of strscpy() is more robust and safer. That's now the recommended way to copy NUL terminated strings. Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org> Reviewed-by: Kees Cook <keescook@chromium.org> Acked-by: Hans Verkuil <hans.verkuil@cisco.com> Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
151 lines
3.4 KiB
C
151 lines
3.4 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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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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#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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strscpy(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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