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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
commit | 2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch) | |
tree | 848558de17fb3008cdf4d861b01ac7781903ce39 /drivers/media/pci/ivtv/ivtv-alsa-main.c | |
parent | Initial commit. (diff) | |
download | linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.tar.xz linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.zip |
Adding upstream version 6.1.76.upstream/6.1.76upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'drivers/media/pci/ivtv/ivtv-alsa-main.c')
-rw-r--r-- | drivers/media/pci/ivtv/ivtv-alsa-main.c | 274 |
1 files changed, 274 insertions, 0 deletions
diff --git a/drivers/media/pci/ivtv/ivtv-alsa-main.c b/drivers/media/pci/ivtv/ivtv-alsa-main.c new file mode 100644 index 000000000..9e13a7128 --- /dev/null +++ b/drivers/media/pci/ivtv/ivtv-alsa-main.c @@ -0,0 +1,274 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * ALSA interface to ivtv PCM capture streams + * + * Copyright (C) 2009,2012 Andy Walls <awalls@md.metrocast.net> + * Copyright (C) 2009 Devin Heitmueller <dheitmueller@kernellabs.com> + * + * Portions of this work were sponsored by ONELAN Limited for the cx18 driver + */ + +#include "ivtv-driver.h" +#include "ivtv-version.h" +#include "ivtv-alsa.h" +#include "ivtv-alsa-pcm.h" + +#include <sound/core.h> +#include <sound/initval.h> + +int ivtv_alsa_debug; +static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX; + +#define IVTV_DEBUG_ALSA_INFO(__fmt, __arg...) \ + do { \ + if (ivtv_alsa_debug & 2) \ + printk(KERN_INFO pr_fmt("%s: alsa:" __fmt), \ + __func__, ##__arg); \ + } while (0) + +module_param_named(debug, ivtv_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_param_array(index, int, NULL, 0444); +MODULE_PARM_DESC(index, + "Index value for IVTV ALSA capture interface(s).\n"); + +MODULE_AUTHOR("Andy Walls"); +MODULE_DESCRIPTION("CX23415/CX23416 ALSA Interface"); +MODULE_LICENSE("GPL"); + +MODULE_VERSION(IVTV_VERSION); + +static inline +struct snd_ivtv_card *to_snd_ivtv_card(struct v4l2_device *v4l2_dev) +{ + return to_ivtv(v4l2_dev)->alsa; +} + +static void snd_ivtv_card_free(struct snd_ivtv_card *itvsc) +{ + if (itvsc == NULL) + return; + + if (itvsc->v4l2_dev != NULL) + to_ivtv(itvsc->v4l2_dev)->alsa = NULL; + + /* FIXME - take any other stopping actions needed */ + + kfree(itvsc); +} + +static void snd_ivtv_card_private_free(struct snd_card *sc) +{ + if (sc == NULL) + return; + snd_ivtv_card_free(sc->private_data); + sc->private_data = NULL; + sc->private_free = NULL; +} + +static int snd_ivtv_card_create(struct v4l2_device *v4l2_dev, + struct snd_card *sc, + struct snd_ivtv_card **itvsc) +{ + *itvsc = kzalloc(sizeof(struct snd_ivtv_card), GFP_KERNEL); + if (*itvsc == NULL) + return -ENOMEM; + + (*itvsc)->v4l2_dev = v4l2_dev; + (*itvsc)->sc = sc; + + sc->private_data = *itvsc; + sc->private_free = snd_ivtv_card_private_free; + + return 0; +} + +static int snd_ivtv_card_set_names(struct snd_ivtv_card *itvsc) +{ + struct ivtv *itv = to_ivtv(itvsc->v4l2_dev); + struct snd_card *sc = itvsc->sc; + + /* sc->driver is used by alsa-lib's configurator: simple, unique */ + strscpy(sc->driver, "CX2341[56]", sizeof(sc->driver)); + + /* sc->shortname is a symlink in /proc/asound: IVTV-M -> cardN */ + snprintf(sc->shortname, sizeof(sc->shortname), "IVTV-%d", + itv->instance); + + /* sc->longname is read from /proc/asound/cards */ + snprintf(sc->longname, sizeof(sc->longname), + "CX2341[56] #%d %s TV/FM Radio/Line-In Capture", + itv->instance, itv->card_name); + + return 0; +} + +static int snd_ivtv_init(struct v4l2_device *v4l2_dev) +{ + struct ivtv *itv = to_ivtv(v4l2_dev); + struct snd_card *sc = NULL; + struct snd_ivtv_card *itvsc; + int ret, idx; + + /* 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 itv->instance */ + + /* (2) Create a card instance */ + /* use first available id if not specified otherwise*/ + idx = index[itv->instance] == -1 ? SNDRV_DEFAULT_IDX1 : index[itv->instance]; + ret = snd_card_new(&itv->pdev->dev, + idx, + SNDRV_DEFAULT_STR1, /* xid from end of shortname*/ + THIS_MODULE, 0, &sc); + if (ret) { + IVTV_ALSA_ERR("%s: snd_card_new() failed with err %d\n", + __func__, ret); + goto err_exit; + } + + /* (3) Create a main component */ + ret = snd_ivtv_card_create(v4l2_dev, sc, &itvsc); + if (ret) { + IVTV_ALSA_ERR("%s: snd_ivtv_card_create() failed with err %d\n", + __func__, ret); + goto err_exit_free; + } + + /* (4) Set the driver ID and name strings */ + snd_ivtv_card_set_names(itvsc); + + /* (5) Create other components: PCM, & proc files */ + ret = snd_ivtv_pcm_create(itvsc); + if (ret) { + IVTV_ALSA_ERR("%s: snd_ivtv_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 */ + itv->alsa = itvsc; + + /* (6) Register the card instance */ + ret = snd_card_register(sc); + if (ret) { + itv->alsa = NULL; + IVTV_ALSA_ERR("%s: snd_card_register() failed with err %d\n", + __func__, ret); + goto err_exit_free; + } + + IVTV_ALSA_INFO("%s: Instance %d registered as ALSA card %d\n", + __func__, itv->instance, sc->number); + + return 0; + +err_exit_free: + if (sc != NULL) + snd_card_free(sc); + kfree(itvsc); +err_exit: + return ret; +} + +static int ivtv_alsa_load(struct ivtv *itv) +{ + struct v4l2_device *v4l2_dev = &itv->v4l2_dev; + struct ivtv_stream *s; + + if (v4l2_dev == NULL) { + pr_err("ivtv-alsa: %s: struct v4l2_device * is NULL\n", + __func__); + return 0; + } + + itv = to_ivtv(v4l2_dev); + if (itv == NULL) { + pr_err("ivtv-alsa itv is NULL\n"); + return 0; + } + + s = &itv->streams[IVTV_ENC_STREAM_TYPE_PCM]; + if (s->vdev.v4l2_dev == NULL) { + IVTV_DEBUG_ALSA_INFO("PCM stream for card is disabled - skipping\n"); + return 0; + } + + if (itv->alsa != NULL) { + IVTV_ALSA_ERR("%s: struct snd_ivtv_card * already exists\n", + __func__); + return 0; + } + + if (snd_ivtv_init(v4l2_dev)) { + IVTV_ALSA_ERR("%s: failed to create struct snd_ivtv_card\n", + __func__); + } else { + IVTV_DEBUG_ALSA_INFO("created ivtv ALSA interface instance\n"); + } + return 0; +} + +static int __init ivtv_alsa_init(void) +{ + pr_info("ivtv-alsa: module loading...\n"); + ivtv_ext_init = &ivtv_alsa_load; + return 0; +} + +static void __exit snd_ivtv_exit(struct snd_ivtv_card *itvsc) +{ + struct ivtv *itv = to_ivtv(itvsc->v4l2_dev); + + /* FIXME - pointer checks & shutdown itvsc */ + + snd_card_free(itvsc->sc); + itv->alsa = NULL; +} + +static int __exit ivtv_alsa_exit_callback(struct device *dev, void *data) +{ + struct v4l2_device *v4l2_dev = dev_get_drvdata(dev); + struct snd_ivtv_card *itvsc; + + if (v4l2_dev == NULL) { + pr_err("ivtv-alsa: %s: struct v4l2_device * is NULL\n", + __func__); + return 0; + } + + itvsc = to_snd_ivtv_card(v4l2_dev); + if (itvsc == NULL) { + IVTV_ALSA_WARN("%s: struct snd_ivtv_card * is NULL\n", + __func__); + return 0; + } + + snd_ivtv_exit(itvsc); + return 0; +} + +static void __exit ivtv_alsa_exit(void) +{ + struct device_driver *drv; + int ret; + + pr_info("ivtv-alsa: module unloading...\n"); + + drv = driver_find("ivtv", &pci_bus_type); + ret = driver_for_each_device(drv, NULL, NULL, ivtv_alsa_exit_callback); + (void)ret; /* suppress compiler warning */ + + ivtv_ext_init = NULL; + pr_info("ivtv-alsa: module unload complete\n"); +} + +module_init(ivtv_alsa_init); +module_exit(ivtv_alsa_exit); |