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1// SPDX-License-Identifier: GPL-2.0-or-later2/*3 * ALSA interface to ivtv PCM capture streams4 *5 * Copyright (C) 2009,2012 Andy Walls <awalls@md.metrocast.net>6 * Copyright (C) 2009 Devin Heitmueller <dheitmueller@kernellabs.com>7 *8 * Portions of this work were sponsored by ONELAN Limited for the cx18 driver9 */10 11#include "ivtv-driver.h"12#include "ivtv-version.h"13#include "ivtv-alsa.h"14#include "ivtv-alsa-pcm.h"15 16#include <sound/core.h>17#include <sound/initval.h>18 19int ivtv_alsa_debug;20static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;21 22#define IVTV_DEBUG_ALSA_INFO(__fmt, __arg...) \23 do { \24 if (ivtv_alsa_debug & 2) \25 printk(KERN_INFO pr_fmt("%s: alsa:" __fmt), \26 __func__, ##__arg); \27 } while (0)28 29module_param_named(debug, ivtv_alsa_debug, int, 0644);30MODULE_PARM_DESC(debug,31 "Debug level (bitmask). Default: 0\n"32 "\t\t\t 1/0x0001: warning\n"33 "\t\t\t 2/0x0002: info\n");34 35module_param_array(index, int, NULL, 0444);36MODULE_PARM_DESC(index,37 "Index value for IVTV ALSA capture interface(s).\n");38 39MODULE_AUTHOR("Andy Walls");40MODULE_DESCRIPTION("CX23415/CX23416 ALSA Interface");41MODULE_LICENSE("GPL");42 43MODULE_VERSION(IVTV_VERSION);44 45static inline46struct snd_ivtv_card *to_snd_ivtv_card(struct v4l2_device *v4l2_dev)47{48 return to_ivtv(v4l2_dev)->alsa;49}50 51static void snd_ivtv_card_free(struct snd_ivtv_card *itvsc)52{53 if (itvsc == NULL)54 return;55 56 if (itvsc->v4l2_dev != NULL)57 to_ivtv(itvsc->v4l2_dev)->alsa = NULL;58 59 /* FIXME - take any other stopping actions needed */60 61 kfree(itvsc);62}63 64static void snd_ivtv_card_private_free(struct snd_card *sc)65{66 if (sc == NULL)67 return;68 snd_ivtv_card_free(sc->private_data);69 sc->private_data = NULL;70 sc->private_free = NULL;71}72 73static int snd_ivtv_card_create(struct v4l2_device *v4l2_dev,74 struct snd_card *sc,75 struct snd_ivtv_card **itvsc)76{77 *itvsc = kzalloc(sizeof(struct snd_ivtv_card), GFP_KERNEL);78 if (*itvsc == NULL)79 return -ENOMEM;80 81 (*itvsc)->v4l2_dev = v4l2_dev;82 (*itvsc)->sc = sc;83 84 sc->private_data = *itvsc;85 sc->private_free = snd_ivtv_card_private_free;86 87 return 0;88}89 90static int snd_ivtv_card_set_names(struct snd_ivtv_card *itvsc)91{92 struct ivtv *itv = to_ivtv(itvsc->v4l2_dev);93 struct snd_card *sc = itvsc->sc;94 95 /* sc->driver is used by alsa-lib's configurator: simple, unique */96 strscpy(sc->driver, "CX2341[56]", sizeof(sc->driver));97 98 /* sc->shortname is a symlink in /proc/asound: IVTV-M -> cardN */99 snprintf(sc->shortname, sizeof(sc->shortname), "IVTV-%d",100 itv->instance);101 102 /* sc->longname is read from /proc/asound/cards */103 snprintf(sc->longname, sizeof(sc->longname),104 "CX2341[56] #%d %s TV/FM Radio/Line-In Capture",105 itv->instance, itv->card_name);106 107 return 0;108}109 110static int snd_ivtv_init(struct v4l2_device *v4l2_dev)111{112 struct ivtv *itv = to_ivtv(v4l2_dev);113 struct snd_card *sc = NULL;114 struct snd_ivtv_card *itvsc;115 int ret, idx;116 117 /* Numbrs steps from "Writing an ALSA Driver" by Takashi Iwai */118 119 /* (1) Check and increment the device index */120 /* This is a no-op for us. We'll use the itv->instance */121 122 /* (2) Create a card instance */123 /* use first available id if not specified otherwise*/124 idx = index[itv->instance] == -1 ? SNDRV_DEFAULT_IDX1 : index[itv->instance];125 ret = snd_card_new(&itv->pdev->dev,126 idx,127 SNDRV_DEFAULT_STR1, /* xid from end of shortname*/128 THIS_MODULE, 0, &sc);129 if (ret) {130 IVTV_ALSA_ERR("%s: snd_card_new() failed with err %d\n",131 __func__, ret);132 goto err_exit;133 }134 135 /* (3) Create a main component */136 ret = snd_ivtv_card_create(v4l2_dev, sc, &itvsc);137 if (ret) {138 IVTV_ALSA_ERR("%s: snd_ivtv_card_create() failed with err %d\n",139 __func__, ret);140 goto err_exit_free;141 }142 143 /* (4) Set the driver ID and name strings */144 snd_ivtv_card_set_names(itvsc);145 146 /* (5) Create other components: PCM, & proc files */147 ret = snd_ivtv_pcm_create(itvsc);148 if (ret) {149 IVTV_ALSA_ERR("%s: snd_ivtv_pcm_create() failed with err %d\n",150 __func__, ret);151 goto err_exit_free;152 }153 /* FIXME - proc files */154 155 /* (7) Set the driver data and return 0 */156 /* We do this out of normal order for PCI drivers to avoid races */157 itv->alsa = itvsc;158 159 /* (6) Register the card instance */160 ret = snd_card_register(sc);161 if (ret) {162 itv->alsa = NULL;163 IVTV_ALSA_ERR("%s: snd_card_register() failed with err %d\n",164 __func__, ret);165 goto err_exit_free;166 }167 168 IVTV_ALSA_INFO("%s: Instance %d registered as ALSA card %d\n",169 __func__, itv->instance, sc->number);170 171 return 0;172 173err_exit_free:174 if (sc != NULL)175 snd_card_free(sc);176 kfree(itvsc);177err_exit:178 return ret;179}180 181static int ivtv_alsa_load(struct ivtv *itv)182{183 struct v4l2_device *v4l2_dev = &itv->v4l2_dev;184 struct ivtv_stream *s;185 186 if (v4l2_dev == NULL) {187 pr_err("ivtv-alsa: %s: struct v4l2_device * is NULL\n",188 __func__);189 return 0;190 }191 192 itv = to_ivtv(v4l2_dev);193 if (itv == NULL) {194 pr_err("ivtv-alsa itv is NULL\n");195 return 0;196 }197 198 s = &itv->streams[IVTV_ENC_STREAM_TYPE_PCM];199 if (s->vdev.v4l2_dev == NULL) {200 IVTV_DEBUG_ALSA_INFO("PCM stream for card is disabled - skipping\n");201 return 0;202 }203 204 if (itv->alsa != NULL) {205 IVTV_ALSA_ERR("%s: struct snd_ivtv_card * already exists\n",206 __func__);207 return 0;208 }209 210 if (snd_ivtv_init(v4l2_dev)) {211 IVTV_ALSA_ERR("%s: failed to create struct snd_ivtv_card\n",212 __func__);213 } else {214 IVTV_DEBUG_ALSA_INFO("created ivtv ALSA interface instance\n");215 }216 return 0;217}218 219static int __init ivtv_alsa_init(void)220{221 pr_info("ivtv-alsa: module loading...\n");222 ivtv_ext_init = &ivtv_alsa_load;223 return 0;224}225 226static void __exit snd_ivtv_exit(struct snd_ivtv_card *itvsc)227{228 struct ivtv *itv = to_ivtv(itvsc->v4l2_dev);229 230 /* FIXME - pointer checks & shutdown itvsc */231 232 snd_card_free(itvsc->sc);233 itv->alsa = NULL;234}235 236static int __exit ivtv_alsa_exit_callback(struct device *dev, void *data)237{238 struct v4l2_device *v4l2_dev = dev_get_drvdata(dev);239 struct snd_ivtv_card *itvsc;240 241 if (v4l2_dev == NULL) {242 pr_err("ivtv-alsa: %s: struct v4l2_device * is NULL\n",243 __func__);244 return 0;245 }246 247 itvsc = to_snd_ivtv_card(v4l2_dev);248 if (itvsc == NULL) {249 IVTV_ALSA_WARN("%s: struct snd_ivtv_card * is NULL\n",250 __func__);251 return 0;252 }253 254 snd_ivtv_exit(itvsc);255 return 0;256}257 258static void __exit ivtv_alsa_exit(void)259{260 struct device_driver *drv;261 int ret;262 263 pr_info("ivtv-alsa: module unloading...\n");264 265 drv = driver_find("ivtv", &pci_bus_type);266 ret = driver_for_each_device(drv, NULL, NULL, ivtv_alsa_exit_callback);267 (void)ret; /* suppress compiler warning */268 269 ivtv_ext_init = NULL;270 pr_info("ivtv-alsa: module unload complete\n");271}272 273module_init(ivtv_alsa_init);274module_exit(ivtv_alsa_exit);275