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-mixer.h"
  24 #include "ivtv-alsa-pcm.h"
  25
  26 #include <sound/core.h>
  27 #include <sound/initval.h>
  28
  29 int ivtv_alsa_debug;
  30 static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;
  31
  32 #define IVTV_DEBUG_ALSA_INFO(__fmt, __arg...) \
  33         do { \
  34                 if (ivtv_alsa_debug & 2) \
  35                         printk(KERN_INFO pr_fmt("%s: alsa:" __fmt),     \
  36                                __func__, ##__arg);                      \
  37         } while (0)
  38
  39 module_param_named(debug, ivtv_alsa_debug, int, 0644);
  40 MODULE_PARM_DESC(debug,
  41                  "Debug level (bitmask). Default: 0\n"
  42                  "\t\t\t  1/0x0001: warning\n"
  43                  "\t\t\t  2/0x0002: info\n");
  44
  45 module_param_array(index, int, NULL, 0444);
  46 MODULE_PARM_DESC(index,
  47                  "Index value for IVTV ALSA capture interface(s).\n");
  48
  49 MODULE_AUTHOR("Andy Walls");
  50 MODULE_DESCRIPTION("CX23415/CX23416 ALSA Interface");
  51 MODULE_SUPPORTED_DEVICE("CX23415/CX23416 MPEG2 encoder");
  52 MODULE_LICENSE("GPL");
  53
  54 MODULE_VERSION(IVTV_VERSION);
  55
  56 static inline
  57 struct snd_ivtv_card *to_snd_ivtv_card(struct v4l2_device *v4l2_dev)
  58 {
  59         return to_ivtv(v4l2_dev)->alsa;
  60 }
  61
  62 static inline
  63 struct snd_ivtv_card *p_to_snd_ivtv_card(struct v4l2_device **v4l2_dev)
  64 {
  65         return container_of(v4l2_dev, struct snd_ivtv_card, v4l2_dev);
  66 }
  67
  68 static void snd_ivtv_card_free(struct snd_ivtv_card *itvsc)
  69 {
  70         if (itvsc == NULL)
  71                 return;
  72
  73         if (itvsc->v4l2_dev != NULL)
  74                 to_ivtv(itvsc->v4l2_dev)->alsa = NULL;
  75
  76         /* FIXME - take any other stopping actions needed */
  77
  78         kfree(itvsc);
  79 }
  80
  81 static void snd_ivtv_card_private_free(struct snd_card *sc)
  82 {
  83         if (sc == NULL)
  84                 return;
  85         snd_ivtv_card_free(sc->private_data);
  86         sc->private_data = NULL;
  87         sc->private_free = NULL;
  88 }
  89
  90 static int snd_ivtv_card_create(struct v4l2_device *v4l2_dev,
  91                                        struct snd_card *sc,
  92                                        struct snd_ivtv_card **itvsc)
  93 {
  94         *itvsc = kzalloc(sizeof(struct snd_ivtv_card), GFP_KERNEL);
  95         if (*itvsc == NULL)
  96                 return -ENOMEM;
  97
  98         (*itvsc)->v4l2_dev = v4l2_dev;
  99         (*itvsc)->sc = sc;
 100
 101         sc->private_data = *itvsc;
 102         sc->private_free = snd_ivtv_card_private_free;
 103
 104         return 0;
 105 }
 106
 107 static int snd_ivtv_card_set_names(struct snd_ivtv_card *itvsc)
 108 {
 109         struct ivtv *itv = to_ivtv(itvsc->v4l2_dev);
 110         struct snd_card *sc = itvsc->sc;
 111
 112         /* sc->driver is used by alsa-lib's configurator: simple, unique */
 113         strlcpy(sc->driver, "CX2341[56]", sizeof(sc->driver));
 114
 115         /* sc->shortname is a symlink in /proc/asound: IVTV-M -> cardN */
 116         snprintf(sc->shortname,  sizeof(sc->shortname), "IVTV-%d",
 117                  itv->instance);
 118
 119         /* sc->longname is read from /proc/asound/cards */
 120         snprintf(sc->longname, sizeof(sc->longname),
 121                  "CX2341[56] #%d %s TV/FM Radio/Line-In Capture",
 122                  itv->instance, itv->card_name);
 123
 124         return 0;
 125 }
 126
 127 static int snd_ivtv_init(struct v4l2_device *v4l2_dev)
 128 {
 129         struct ivtv *itv = to_ivtv(v4l2_dev);
 130         struct snd_card *sc = NULL;
 131         struct snd_ivtv_card *itvsc;
 132         int ret, idx;
 133
 134         /* Numbrs steps from "Writing an ALSA Driver" by Takashi Iwai */
 135
 136         /* (1) Check and increment the device index */
 137         /* This is a no-op for us.  We'll use the itv->instance */
 138
 139         /* (2) Create a card instance */
 140         /* use first available id if not specified otherwise*/
 141         idx = index[itv->instance] == -1 ? SNDRV_DEFAULT_IDX1 : index[itv->instance];
 142         ret = snd_card_new(&itv->pdev->dev,
 143                            idx,
 144                            SNDRV_DEFAULT_STR1, /* xid from end of shortname*/
 145                            THIS_MODULE, 0, &sc);
 146         if (ret) {
 147                 IVTV_ALSA_ERR("%s: snd_card_new() failed with err %d\n",
 148                               __func__, ret);
 149                 goto err_exit;
 150         }
 151
 152         /* (3) Create a main component */
 153         ret = snd_ivtv_card_create(v4l2_dev, sc, &itvsc);
 154         if (ret) {
 155                 IVTV_ALSA_ERR("%s: snd_ivtv_card_create() failed with err %d\n",
 156                               __func__, ret);
 157                 goto err_exit_free;
 158         }
 159
 160         /* (4) Set the driver ID and name strings */
 161         snd_ivtv_card_set_names(itvsc);
 162
 163         /* (5) Create other components: mixer, PCM, & proc files */
 164 #if 0
 165         ret = snd_ivtv_mixer_create(itvsc);
 166         if (ret) {
 167                 IVTV_ALSA_WARN("%s: snd_ivtv_mixer_create() failed with err %d: proceeding anyway\n",
 168                                __func__, ret);
 169         }
 170 #endif
 171
 172         ret = snd_ivtv_pcm_create(itvsc);
 173         if (ret) {
 174                 IVTV_ALSA_ERR("%s: snd_ivtv_pcm_create() failed with err %d\n",
 175                               __func__, ret);
 176                 goto err_exit_free;
 177         }
 178         /* FIXME - proc files */
 179
 180         /* (7) Set the driver data and return 0 */
 181         /* We do this out of normal order for PCI drivers to avoid races */
 182         itv->alsa = itvsc;
 183
 184         /* (6) Register the card instance */
 185         ret = snd_card_register(sc);
 186         if (ret) {
 187                 itv->alsa = NULL;
 188                 IVTV_ALSA_ERR("%s: snd_card_register() failed with err %d\n",
 189                               __func__, ret);
 190                 goto err_exit_free;
 191         }
 192
 193         IVTV_ALSA_INFO("%s: Instance %d registered as ALSA card %d\n",
 194                          __func__, itv->instance, sc->number);
 195
 196         return 0;
 197
 198 err_exit_free:
 199         if (sc != NULL)
 200                 snd_card_free(sc);
 201         kfree(itvsc);
 202 err_exit:
 203         return ret;
 204 }
 205
 206 static int ivtv_alsa_load(struct ivtv *itv)
 207 {
 208         struct v4l2_device *v4l2_dev = &itv->v4l2_dev;
 209         struct ivtv_stream *s;
 210
 211         if (v4l2_dev == NULL) {
 212                 pr_err("ivtv-alsa: %s: struct v4l2_device * is NULL\n",
 213                        __func__);
 214                 return 0;
 215         }
 216
 217         itv = to_ivtv(v4l2_dev);
 218         if (itv == NULL) {
 219                 pr_err("ivtv-alsa itv is NULL\n");
 220                 return 0;
 221         }
 222
 223         s = &itv->streams[IVTV_ENC_STREAM_TYPE_PCM];
 224         if (s->vdev.v4l2_dev == NULL) {
 225                 IVTV_DEBUG_ALSA_INFO("PCM stream for card is disabled - skipping\n");
 226                 return 0;
 227         }
 228
 229         if (itv->alsa != NULL) {
 230                 IVTV_ALSA_ERR("%s: struct snd_ivtv_card * already exists\n",
 231                               __func__);
 232                 return 0;
 233         }
 234
 235         if (snd_ivtv_init(v4l2_dev)) {
 236                 IVTV_ALSA_ERR("%s: failed to create struct snd_ivtv_card\n",
 237                               __func__);
 238         } else {
 239                 IVTV_DEBUG_ALSA_INFO("created ivtv ALSA interface instance\n");
 240         }
 241         return 0;
 242 }
 243
 244 static int __init ivtv_alsa_init(void)
 245 {
 246         pr_info("ivtv-alsa: module loading...\n");
 247         ivtv_ext_init = &ivtv_alsa_load;
 248         return 0;
 249 }
 250
 251 static void __exit snd_ivtv_exit(struct snd_ivtv_card *itvsc)
 252 {
 253         struct ivtv *itv = to_ivtv(itvsc->v4l2_dev);
 254
 255         /* FIXME - pointer checks & shutdown itvsc */
 256
 257         snd_card_free(itvsc->sc);
 258         itv->alsa = NULL;
 259 }
 260
 261 static int __exit ivtv_alsa_exit_callback(struct device *dev, void *data)
 262 {
 263         struct v4l2_device *v4l2_dev = dev_get_drvdata(dev);
 264         struct snd_ivtv_card *itvsc;
 265
 266         if (v4l2_dev == NULL) {
 267                 pr_err("ivtv-alsa: %s: struct v4l2_device * is NULL\n",
 268                        __func__);
 269                 return 0;
 270         }
 271
 272         itvsc = to_snd_ivtv_card(v4l2_dev);
 273         if (itvsc == NULL) {
 274                 IVTV_ALSA_WARN("%s: struct snd_ivtv_card * is NULL\n",
 275                                __func__);
 276                 return 0;
 277         }
 278
 279         snd_ivtv_exit(itvsc);
 280         return 0;
 281 }
 282
 283 static void __exit ivtv_alsa_exit(void)
 284 {
 285         struct device_driver *drv;
 286         int ret;
 287
 288         pr_info("ivtv-alsa: module unloading...\n");
 289
 290         drv = driver_find("ivtv", &pci_bus_type);
 291         ret = driver_for_each_device(drv, NULL, NULL, ivtv_alsa_exit_callback);
 292         (void)ret;      /* suppress compiler warning */
 293
 294         ivtv_ext_init = NULL;
 295         pr_info("ivtv-alsa: module unload complete\n");
 296 }
 297
 298 module_init(ivtv_alsa_init);
 299 module_exit(ivtv_alsa_exit);