drivers/media/pci/ivtv/ivtv-alsa-main.c

   1 /*
   2  *  ALSA interface to ivtv PCM capture streams
   3  *
   4  *  Copyright (C) 2009,2012  Andy Walls <awalls@md.metrocast.net>
   5  *  Copyright (C) 2009  Devin Heitmueller <dheitmueller@kernellabs.com>
   6  *
   7  *  Portions of this work were sponsored by ONELAN Limited for the cx18 driver
   8  *
   9  *  This program is free software; you can redistribute it and/or modify
  10  *  it under the terms of the GNU General Public License as published by
  11  *  the Free Software Foundation; either version 2 of the License, or
  12  *  (at your option) any later version.
  13  *
  14  *  This program is distributed in the hope that it will be useful,
  15  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  *  GNU General Public License for more details.
  18  *
  19  *  You should have received a copy of the GNU General Public License
  20  *  along with this program; if not, write to the Free Software
  21  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  22  *  02111-1307  USA
  23  */
  24
  25 #include <linux/init.h>
  26 #include <linux/slab.h>
  27 #include <linux/module.h>
  28 #include <linux/kernel.h>
  29 #include <linux/device.h>
  30 #include <linux/spinlock.h>
  31
  32 #include <media/v4l2-device.h>
  33
  34 #include <sound/core.h>
  35 #include <sound/initval.h>
  36
  37 #include "ivtv-driver.h"
  38 #include "ivtv-version.h"
  39 #include "ivtv-alsa.h"
  40 #include "ivtv-alsa-mixer.h"
  41 #include "ivtv-alsa-pcm.h"
  42
  43 int ivtv_alsa_debug;
  44
  45 #define IVTV_DEBUG_ALSA_INFO(fmt, arg...) \
  46         do { \
  47                 if (ivtv_alsa_debug & 2) \
  48                         pr_info("%s: " fmt, "ivtv-alsa", ## arg); \
  49         } while (0)
  50
  51 module_param_named(debug, ivtv_alsa_debug, int, 0644);
  52 MODULE_PARM_DESC(debug,
  53                  "Debug level (bitmask). Default: 0\n"
  54                  "\t\t\t  1/0x0001: warning\n"
  55                  "\t\t\t  2/0x0002: info\n");
  56
  57 MODULE_AUTHOR("Andy Walls");
  58 MODULE_DESCRIPTION("CX23415/CX23416 ALSA Interface");
  59 MODULE_SUPPORTED_DEVICE("CX23415/CX23416 MPEG2 encoder");
  60 MODULE_LICENSE("GPL");
  61
  62 MODULE_VERSION(IVTV_VERSION);
  63
  64 static inline
  65 struct snd_ivtv_card *to_snd_ivtv_card(struct v4l2_device *v4l2_dev)
  66 {
  67         return to_ivtv(v4l2_dev)->alsa;
  68 }
  69
  70 static inline
  71 struct snd_ivtv_card *p_to_snd_ivtv_card(struct v4l2_device **v4l2_dev)
  72 {
  73         return container_of(v4l2_dev, struct snd_ivtv_card, v4l2_dev);
  74 }
  75
  76 static void snd_ivtv_card_free(struct snd_ivtv_card *itvsc)
  77 {
  78         if (itvsc == NULL)
  79                 return;
  80
  81         if (itvsc->v4l2_dev != NULL)
  82                 to_ivtv(itvsc->v4l2_dev)->alsa = NULL;
  83
  84         /* FIXME - take any other stopping actions needed */
  85
  86         kfree(itvsc);
  87 }
  88
  89 static void snd_ivtv_card_private_free(struct snd_card *sc)
  90 {
  91         if (sc == NULL)
  92                 return;
  93         snd_ivtv_card_free(sc->private_data);
  94         sc->private_data = NULL;
  95         sc->private_free = NULL;
  96 }
  97
  98 static int snd_ivtv_card_create(struct v4l2_device *v4l2_dev,
  99                                        struct snd_card *sc,
 100                                        struct snd_ivtv_card **itvsc)
 101 {
 102         *itvsc = kzalloc(sizeof(struct snd_ivtv_card), GFP_KERNEL);
 103         if (*itvsc == NULL)
 104                 return -ENOMEM;
 105
 106         (*itvsc)->v4l2_dev = v4l2_dev;
 107         (*itvsc)->sc = sc;
 108
 109         sc->private_data = *itvsc;
 110         sc->private_free = snd_ivtv_card_private_free;
 111
 112         return 0;
 113 }
 114
 115 static int snd_ivtv_card_set_names(struct snd_ivtv_card *itvsc)
 116 {
 117         struct ivtv *itv = to_ivtv(itvsc->v4l2_dev);
 118         struct snd_card *sc = itvsc->sc;
 119
 120         /* sc->driver is used by alsa-lib's configurator: simple, unique */
 121         strlcpy(sc->driver, "CX2341[56]", sizeof(sc->driver));
 122
 123         /* sc->shortname is a symlink in /proc/asound: IVTV-M -> cardN */
 124         snprintf(sc->shortname,  sizeof(sc->shortname), "IVTV-%d",
 125                  itv->instance);
 126
 127         /* sc->longname is read from /proc/asound/cards */
 128         snprintf(sc->longname, sizeof(sc->longname),
 129                  "CX2341[56] #%d %s TV/FM Radio/Line-In Capture",
 130                  itv->instance, itv->card_name);
 131
 132         return 0;
 133 }
 134
 135 static int snd_ivtv_init(struct v4l2_device *v4l2_dev)
 136 {
 137         struct ivtv *itv = to_ivtv(v4l2_dev);
 138         struct snd_card *sc = NULL;
 139         struct snd_ivtv_card *itvsc;
 140         int ret;
 141
 142         /* Numbrs steps from "Writing an ALSA Driver" by Takashi Iwai */
 143
 144         /* (1) Check and increment the device index */
 145         /* This is a no-op for us.  We'll use the itv->instance */
 146
 147         /* (2) Create a card instance */
 148         ret = snd_card_create(SNDRV_DEFAULT_IDX1, /* use first available id */
 149                               SNDRV_DEFAULT_STR1, /* xid from end of shortname*/
 150                               THIS_MODULE, 0, &sc);
 151         if (ret) {
 152                 IVTV_ALSA_ERR("%s: snd_card_create() failed with err %d\n",
 153                               __func__, ret);
 154                 goto err_exit;
 155         }
 156
 157         /* (3) Create a main component */
 158         ret = snd_ivtv_card_create(v4l2_dev, sc, &itvsc);
 159         if (ret) {
 160                 IVTV_ALSA_ERR("%s: snd_ivtv_card_create() failed with err %d\n",
 161                               __func__, ret);
 162                 goto err_exit_free;
 163         }
 164
 165         /* (4) Set the driver ID and name strings */
 166         snd_ivtv_card_set_names(itvsc);
 167
 168         /* (5) Create other components: mixer, PCM, & proc files */
 169 #if 0
 170         ret = snd_ivtv_mixer_create(itvsc);
 171         if (ret) {
 172                 IVTV_ALSA_WARN("%s: snd_ivtv_mixer_create() failed with err %d:"
 173                                " proceeding anyway\n", __func__, ret);
 174         }
 175 #endif
 176
 177         ret = snd_ivtv_pcm_create(itvsc);
 178         if (ret) {
 179                 IVTV_ALSA_ERR("%s: snd_ivtv_pcm_create() failed with err %d\n",
 180                               __func__, ret);
 181                 goto err_exit_free;
 182         }
 183         /* FIXME - proc files */
 184
 185         /* (7) Set the driver data and return 0 */
 186         /* We do this out of normal order for PCI drivers to avoid races */
 187         itv->alsa = itvsc;
 188
 189         /* (6) Register the card instance */
 190         ret = snd_card_register(sc);
 191         if (ret) {
 192                 itv->alsa = NULL;
 193                 IVTV_ALSA_ERR("%s: snd_card_register() failed with err %d\n",
 194                               __func__, ret);
 195                 goto err_exit_free;
 196         }
 197
 198         return 0;
 199
 200 err_exit_free:
 201         if (sc != NULL)
 202                 snd_card_free(sc);
 203         kfree(itvsc);
 204 err_exit:
 205         return ret;
 206 }
 207
 208 static int ivtv_alsa_load(struct ivtv *itv)
 209 {
 210         struct v4l2_device *v4l2_dev = &itv->v4l2_dev;
 211         struct ivtv_stream *s;
 212
 213         if (v4l2_dev == NULL) {
 214                 pr_err("ivtv-alsa: %s: struct v4l2_device * is NULL\n",
 215                        __func__);
 216                 return 0;
 217         }
 218
 219         itv = to_ivtv(v4l2_dev);
 220         if (itv == NULL) {
 221                 pr_err("ivtv-alsa itv is NULL\n");
 222                 return 0;
 223         }
 224
 225         s = &itv->streams[IVTV_ENC_STREAM_TYPE_PCM];
 226         if (s->vdev == NULL) {
 227                 IVTV_DEBUG_ALSA_INFO("%s: PCM stream for card is disabled - "
 228                                      "skipping\n", __func__);
 229                 return 0;
 230         }
 231
 232         if (itv->alsa != NULL) {
 233                 IVTV_ALSA_ERR("%s: struct snd_ivtv_card * already exists\n",
 234                               __func__);
 235                 return 0;
 236         }
 237
 238         if (snd_ivtv_init(v4l2_dev)) {
 239                 IVTV_ALSA_ERR("%s: failed to create struct snd_ivtv_card\n",
 240                               __func__);
 241         } else {
 242                 IVTV_DEBUG_ALSA_INFO("%s: created ivtv ALSA interface instance "
 243                                      "\n", __func__);
 244         }
 245         return 0;
 246 }
 247
 248 static int __init ivtv_alsa_init(void)
 249 {
 250         pr_info("ivtv-alsa: module loading...\n");
 251         ivtv_ext_init = &ivtv_alsa_load;
 252         return 0;
 253 }
 254
 255 static void __exit snd_ivtv_exit(struct snd_ivtv_card *itvsc)
 256 {
 257         struct ivtv *itv = to_ivtv(itvsc->v4l2_dev);
 258
 259         /* FIXME - pointer checks & shutdown itvsc */
 260
 261         snd_card_free(itvsc->sc);
 262         itv->alsa = NULL;
 263 }
 264
 265 static int __exit ivtv_alsa_exit_callback(struct device *dev, void *data)
 266 {
 267         struct v4l2_device *v4l2_dev = dev_get_drvdata(dev);
 268         struct snd_ivtv_card *itvsc;
 269
 270         if (v4l2_dev == NULL) {
 271                 pr_err("ivtv-alsa: %s: struct v4l2_device * is NULL\n",
 272                        __func__);
 273                 return 0;
 274         }
 275
 276         itvsc = to_snd_ivtv_card(v4l2_dev);
 277         if (itvsc == NULL) {
 278                 IVTV_ALSA_WARN("%s: struct snd_ivtv_card * is NULL\n",
 279                                __func__);
 280                 return 0;
 281         }
 282
 283         snd_ivtv_exit(itvsc);
 284         return 0;
 285 }
 286
 287 static void __exit ivtv_alsa_exit(void)
 288 {
 289         struct device_driver *drv;
 290         int ret;
 291
 292         pr_info("ivtv-alsa: module unloading...\n");
 293
 294         drv = driver_find("ivtv", &pci_bus_type);
 295         ret = driver_for_each_device(drv, NULL, NULL, ivtv_alsa_exit_callback);
 296         (void)ret;      /* suppress compiler warning */
 297
 298         ivtv_ext_init = NULL;
 299         pr_info("ivtv-alsa: module unload complete\n");
 300 }
 301
 302 module_init(ivtv_alsa_init);
 303 module_exit(ivtv_alsa_exit);