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
  20 #include "ivtv-driver.h"
  21 #include "ivtv-version.h"
  22 #include "ivtv-alsa.h"
  23 #include "ivtv-alsa-pcm.h"
  24
  25 #include <sound/core.h>
  26 #include <sound/initval.h>
  27
  28 int ivtv_alsa_debug;
  29 static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;
  30
  31 #define IVTV_DEBUG_ALSA_INFO(__fmt, __arg...) \
  32         do { \
  33                 if (ivtv_alsa_debug & 2) \
  34                         printk(KERN_INFO pr_fmt("%s: alsa:" __fmt),     \
  35                                __func__, ##__arg);                      \
  36         } while (0)
  37
  38 module_param_named(debug, ivtv_alsa_debug, int, 0644);
  39 MODULE_PARM_DESC(debug,
  40                  "Debug level (bitmask). Default: 0\n"
  41                  "\t\t\t  1/0x0001: warning\n"
  42                  "\t\t\t  2/0x0002: info\n");
  43
  44 module_param_array(index, int, NULL, 0444);
  45 MODULE_PARM_DESC(index,
  46                  "Index value for IVTV ALSA capture interface(s).\n");
  47
  48 MODULE_AUTHOR("Andy Walls");
  49 MODULE_DESCRIPTION("CX23415/CX23416 ALSA Interface");
  50 MODULE_SUPPORTED_DEVICE("CX23415/CX23416 MPEG2 encoder");
  51 MODULE_LICENSE("GPL");
  52
  53 MODULE_VERSION(IVTV_VERSION);
  54
  55 static inline
  56 struct snd_ivtv_card *to_snd_ivtv_card(struct v4l2_device *v4l2_dev)
  57 {
  58         return to_ivtv(v4l2_dev)->alsa;
  59 }
  60
  61 static inline
  62 struct snd_ivtv_card *p_to_snd_ivtv_card(struct v4l2_device **v4l2_dev)
  63 {
  64         return container_of(v4l2_dev, struct snd_ivtv_card, v4l2_dev);
  65 }
  66
  67 static void snd_ivtv_card_free(struct snd_ivtv_card *itvsc)
  68 {
  69         if (itvsc == NULL)
  70                 return;
  71
  72         if (itvsc->v4l2_dev != NULL)
  73                 to_ivtv(itvsc->v4l2_dev)->alsa = NULL;
  74
  75         /* FIXME - take any other stopping actions needed */
  76
  77         kfree(itvsc);
  78 }
  79
  80 static void snd_ivtv_card_private_free(struct snd_card *sc)
  81 {
  82         if (sc == NULL)
  83                 return;
  84         snd_ivtv_card_free(sc->private_data);
  85         sc->private_data = NULL;
  86         sc->private_free = NULL;
  87 }
  88
  89 static int snd_ivtv_card_create(struct v4l2_device *v4l2_dev,
  90                                        struct snd_card *sc,
  91                                        struct snd_ivtv_card **itvsc)
  92 {
  93         *itvsc = kzalloc(sizeof(struct snd_ivtv_card), GFP_KERNEL);
  94         if (*itvsc == NULL)
  95                 return -ENOMEM;
  96
  97         (*itvsc)->v4l2_dev = v4l2_dev;
  98         (*itvsc)->sc = sc;
  99
 100         sc->private_data = *itvsc;
 101         sc->private_free = snd_ivtv_card_private_free;
 102
 103         return 0;
 104 }
 105
 106 static int snd_ivtv_card_set_names(struct snd_ivtv_card *itvsc)
 107 {
 108         struct ivtv *itv = to_ivtv(itvsc->v4l2_dev);
 109         struct snd_card *sc = itvsc->sc;
 110
 111         /* sc->driver is used by alsa-lib's configurator: simple, unique */
 112         strlcpy(sc->driver, "CX2341[56]", sizeof(sc->driver));
 113
 114         /* sc->shortname is a symlink in /proc/asound: IVTV-M -> cardN */
 115         snprintf(sc->shortname,  sizeof(sc->shortname), "IVTV-%d",
 116                  itv->instance);
 117
 118         /* sc->longname is read from /proc/asound/cards */
 119         snprintf(sc->longname, sizeof(sc->longname),
 120                  "CX2341[56] #%d %s TV/FM Radio/Line-In Capture",
 121                  itv->instance, itv->card_name);
 122
 123         return 0;
 124 }
 125
 126 static int snd_ivtv_init(struct v4l2_device *v4l2_dev)
 127 {
 128         struct ivtv *itv = to_ivtv(v4l2_dev);
 129         struct snd_card *sc = NULL;
 130         struct snd_ivtv_card *itvsc;
 131         int ret, idx;
 132
 133         /* Numbrs steps from "Writing an ALSA Driver" by Takashi Iwai */
 134
 135         /* (1) Check and increment the device index */
 136         /* This is a no-op for us.  We'll use the itv->instance */
 137
 138         /* (2) Create a card instance */
 139         /* use first available id if not specified otherwise*/
 140         idx = index[itv->instance] == -1 ? SNDRV_DEFAULT_IDX1 : index[itv->instance];
 141         ret = snd_card_new(&itv->pdev->dev,
 142                            idx,
 143                            SNDRV_DEFAULT_STR1, /* xid from end of shortname*/
 144                            THIS_MODULE, 0, &sc);
 145         if (ret) {
 146                 IVTV_ALSA_ERR("%s: snd_card_new() failed with err %d\n",
 147                               __func__, ret);
 148                 goto err_exit;
 149         }
 150
 151         /* (3) Create a main component */
 152         ret = snd_ivtv_card_create(v4l2_dev, sc, &itvsc);
 153         if (ret) {
 154                 IVTV_ALSA_ERR("%s: snd_ivtv_card_create() failed with err %d\n",
 155                               __func__, ret);
 156                 goto err_exit_free;
 157         }
 158
 159         /* (4) Set the driver ID and name strings */
 160         snd_ivtv_card_set_names(itvsc);
 161
 162         /* (5) Create other components: PCM, & proc files */
 163         ret = snd_ivtv_pcm_create(itvsc);
 164         if (ret) {
 165                 IVTV_ALSA_ERR("%s: snd_ivtv_pcm_create() failed with err %d\n",
 166                               __func__, ret);
 167                 goto err_exit_free;
 168         }
 169         /* FIXME - proc files */
 170
 171         /* (7) Set the driver data and return 0 */
 172         /* We do this out of normal order for PCI drivers to avoid races */
 173         itv->alsa = itvsc;
 174
 175         /* (6) Register the card instance */
 176         ret = snd_card_register(sc);
 177         if (ret) {
 178                 itv->alsa = NULL;
 179                 IVTV_ALSA_ERR("%s: snd_card_register() failed with err %d\n",
 180                               __func__, ret);
 181                 goto err_exit_free;
 182         }
 183
 184         IVTV_ALSA_INFO("%s: Instance %d registered as ALSA card %d\n",
 185                          __func__, itv->instance, sc->number);
 186
 187         return 0;
 188
 189 err_exit_free:
 190         if (sc != NULL)
 191                 snd_card_free(sc);
 192         kfree(itvsc);
 193 err_exit:
 194         return ret;
 195 }
 196
 197 static int ivtv_alsa_load(struct ivtv *itv)
 198 {
 199         struct v4l2_device *v4l2_dev = &itv->v4l2_dev;
 200         struct ivtv_stream *s;
 201
 202         if (v4l2_dev == NULL) {
 203                 pr_err("ivtv-alsa: %s: struct v4l2_device * is NULL\n",
 204                        __func__);
 205                 return 0;
 206         }
 207
 208         itv = to_ivtv(v4l2_dev);
 209         if (itv == NULL) {
 210                 pr_err("ivtv-alsa itv is NULL\n");
 211                 return 0;
 212         }
 213
 214         s = &itv->streams[IVTV_ENC_STREAM_TYPE_PCM];
 215         if (s->vdev.v4l2_dev == NULL) {
 216                 IVTV_DEBUG_ALSA_INFO("PCM stream for card is disabled - skipping\n");
 217                 return 0;
 218         }
 219
 220         if (itv->alsa != NULL) {
 221                 IVTV_ALSA_ERR("%s: struct snd_ivtv_card * already exists\n",
 222                               __func__);
 223                 return 0;
 224         }
 225
 226         if (snd_ivtv_init(v4l2_dev)) {
 227                 IVTV_ALSA_ERR("%s: failed to create struct snd_ivtv_card\n",
 228                               __func__);
 229         } else {
 230                 IVTV_DEBUG_ALSA_INFO("created ivtv ALSA interface instance\n");
 231         }
 232         return 0;
 233 }
 234
 235 static int __init ivtv_alsa_init(void)
 236 {
 237         pr_info("ivtv-alsa: module loading...\n");
 238         ivtv_ext_init = &ivtv_alsa_load;
 239         return 0;
 240 }
 241
 242 static void __exit snd_ivtv_exit(struct snd_ivtv_card *itvsc)
 243 {
 244         struct ivtv *itv = to_ivtv(itvsc->v4l2_dev);
 245
 246         /* FIXME - pointer checks & shutdown itvsc */
 247
 248         snd_card_free(itvsc->sc);
 249         itv->alsa = NULL;
 250 }
 251
 252 static int __exit ivtv_alsa_exit_callback(struct device *dev, void *data)
 253 {
 254         struct v4l2_device *v4l2_dev = dev_get_drvdata(dev);
 255         struct snd_ivtv_card *itvsc;
 256
 257         if (v4l2_dev == NULL) {
 258                 pr_err("ivtv-alsa: %s: struct v4l2_device * is NULL\n",
 259                        __func__);
 260                 return 0;
 261         }
 262
 263         itvsc = to_snd_ivtv_card(v4l2_dev);
 264         if (itvsc == NULL) {
 265                 IVTV_ALSA_WARN("%s: struct snd_ivtv_card * is NULL\n",
 266                                __func__);
 267                 return 0;
 268         }
 269
 270         snd_ivtv_exit(itvsc);
 271         return 0;
 272 }
 273
 274 static void __exit ivtv_alsa_exit(void)
 275 {
 276         struct device_driver *drv;
 277         int ret;
 278
 279         pr_info("ivtv-alsa: module unloading...\n");
 280
 281         drv = driver_find("ivtv", &pci_bus_type);
 282         ret = driver_for_each_device(drv, NULL, NULL, ivtv_alsa_exit_callback);
 283         (void)ret;      /* suppress compiler warning */
 284
 285         ivtv_ext_init = NULL;
 286         pr_info("ivtv-alsa: module unload complete\n");
 287 }
 288
 289 module_init(ivtv_alsa_init);
 290 module_exit(ivtv_alsa_exit);