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 static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;
  45
  46 #define IVTV_DEBUG_ALSA_INFO(fmt, arg...) \
  47         do { \
  48                 if (ivtv_alsa_debug & 2) \
  49                         pr_info("%s: " fmt, "ivtv-alsa", ## arg); \
  50         } while (0)
  51
  52 module_param_named(debug, ivtv_alsa_debug, int, 0644);
  53 MODULE_PARM_DESC(debug,
  54                  "Debug level (bitmask). Default: 0\n"
  55                  "\t\t\t  1/0x0001: warning\n"
  56                  "\t\t\t  2/0x0002: info\n");
  57
  58 module_param_array(index, int, NULL, 0444);
  59 MODULE_PARM_DESC(index,
  60                  "Index value for IVTV ALSA capture interface(s).\n");
  61
  62 MODULE_AUTHOR("Andy Walls");
  63 MODULE_DESCRIPTION("CX23415/CX23416 ALSA Interface");
  64 MODULE_SUPPORTED_DEVICE("CX23415/CX23416 MPEG2 encoder");
  65 MODULE_LICENSE("GPL");
  66
  67 MODULE_VERSION(IVTV_VERSION);
  68
  69 static inline
  70 struct snd_ivtv_card *to_snd_ivtv_card(struct v4l2_device *v4l2_dev)
  71 {
  72         return to_ivtv(v4l2_dev)->alsa;
  73 }
  74
  75 static inline
  76 struct snd_ivtv_card *p_to_snd_ivtv_card(struct v4l2_device **v4l2_dev)
  77 {
  78         return container_of(v4l2_dev, struct snd_ivtv_card, v4l2_dev);
  79 }
  80
  81 static void snd_ivtv_card_free(struct snd_ivtv_card *itvsc)
  82 {
  83         if (itvsc == NULL)
  84                 return;
  85
  86         if (itvsc->v4l2_dev != NULL)
  87                 to_ivtv(itvsc->v4l2_dev)->alsa = NULL;
  88
  89         /* FIXME - take any other stopping actions needed */
  90
  91         kfree(itvsc);
  92 }
  93
  94 static void snd_ivtv_card_private_free(struct snd_card *sc)
  95 {
  96         if (sc == NULL)
  97                 return;
  98         snd_ivtv_card_free(sc->private_data);
  99         sc->private_data = NULL;
 100         sc->private_free = NULL;
 101 }
 102
 103 static int snd_ivtv_card_create(struct v4l2_device *v4l2_dev,
 104                                        struct snd_card *sc,
 105                                        struct snd_ivtv_card **itvsc)
 106 {
 107         *itvsc = kzalloc(sizeof(struct snd_ivtv_card), GFP_KERNEL);
 108         if (*itvsc == NULL)
 109                 return -ENOMEM;
 110
 111         (*itvsc)->v4l2_dev = v4l2_dev;
 112         (*itvsc)->sc = sc;
 113
 114         sc->private_data = *itvsc;
 115         sc->private_free = snd_ivtv_card_private_free;
 116
 117         return 0;
 118 }
 119
 120 static int snd_ivtv_card_set_names(struct snd_ivtv_card *itvsc)
 121 {
 122         struct ivtv *itv = to_ivtv(itvsc->v4l2_dev);
 123         struct snd_card *sc = itvsc->sc;
 124
 125         /* sc->driver is used by alsa-lib's configurator: simple, unique */
 126         strlcpy(sc->driver, "CX2341[56]", sizeof(sc->driver));
 127
 128         /* sc->shortname is a symlink in /proc/asound: IVTV-M -> cardN */
 129         snprintf(sc->shortname,  sizeof(sc->shortname), "IVTV-%d",
 130                  itv->instance);
 131
 132         /* sc->longname is read from /proc/asound/cards */
 133         snprintf(sc->longname, sizeof(sc->longname),
 134                  "CX2341[56] #%d %s TV/FM Radio/Line-In Capture",
 135                  itv->instance, itv->card_name);
 136
 137         return 0;
 138 }
 139
 140 static int snd_ivtv_init(struct v4l2_device *v4l2_dev)
 141 {
 142         struct ivtv *itv = to_ivtv(v4l2_dev);
 143         struct snd_card *sc = NULL;
 144         struct snd_ivtv_card *itvsc;
 145         int ret, idx;
 146
 147         /* Numbrs steps from "Writing an ALSA Driver" by Takashi Iwai */
 148
 149         /* (1) Check and increment the device index */
 150         /* This is a no-op for us.  We'll use the itv->instance */
 151
 152         /* (2) Create a card instance */
 153         /* use first available id if not specified otherwise*/
 154         idx = index[itv->instance] == -1 ? SNDRV_DEFAULT_IDX1 : index[itv->instance];
 155         ret = snd_card_new(&itv->pdev->dev,
 156                            idx,
 157                            SNDRV_DEFAULT_STR1, /* xid from end of shortname*/
 158                            THIS_MODULE, 0, &sc);
 159         if (ret) {
 160                 IVTV_ALSA_ERR("%s: snd_card_new() failed with err %d\n",
 161                               __func__, ret);
 162                 goto err_exit;
 163         }
 164
 165         /* (3) Create a main component */
 166         ret = snd_ivtv_card_create(v4l2_dev, sc, &itvsc);
 167         if (ret) {
 168                 IVTV_ALSA_ERR("%s: snd_ivtv_card_create() failed with err %d\n",
 169                               __func__, ret);
 170                 goto err_exit_free;
 171         }
 172
 173         /* (4) Set the driver ID and name strings */
 174         snd_ivtv_card_set_names(itvsc);
 175
 176         /* (5) Create other components: mixer, PCM, & proc files */
 177 #if 0
 178         ret = snd_ivtv_mixer_create(itvsc);
 179         if (ret) {
 180                 IVTV_ALSA_WARN("%s: snd_ivtv_mixer_create() failed with err %d:"
 181                                " proceeding anyway\n", __func__, ret);
 182         }
 183 #endif
 184
 185         ret = snd_ivtv_pcm_create(itvsc);
 186         if (ret) {
 187                 IVTV_ALSA_ERR("%s: snd_ivtv_pcm_create() failed with err %d\n",
 188                               __func__, ret);
 189                 goto err_exit_free;
 190         }
 191         /* FIXME - proc files */
 192
 193         /* (7) Set the driver data and return 0 */
 194         /* We do this out of normal order for PCI drivers to avoid races */
 195         itv->alsa = itvsc;
 196
 197         /* (6) Register the card instance */
 198         ret = snd_card_register(sc);
 199         if (ret) {
 200                 itv->alsa = NULL;
 201                 IVTV_ALSA_ERR("%s: snd_card_register() failed with err %d\n",
 202                               __func__, ret);
 203                 goto err_exit_free;
 204         }
 205
 206         IVTV_ALSA_INFO("%s: Instance %d registered as ALSA card %d\n",
 207                          __func__, itv->instance, sc->number);
 208
 209         return 0;
 210
 211 err_exit_free:
 212         if (sc != NULL)
 213                 snd_card_free(sc);
 214         kfree(itvsc);
 215 err_exit:
 216         return ret;
 217 }
 218
 219 static int ivtv_alsa_load(struct ivtv *itv)
 220 {
 221         struct v4l2_device *v4l2_dev = &itv->v4l2_dev;
 222         struct ivtv_stream *s;
 223
 224         if (v4l2_dev == NULL) {
 225                 pr_err("ivtv-alsa: %s: struct v4l2_device * is NULL\n",
 226                        __func__);
 227                 return 0;
 228         }
 229
 230         itv = to_ivtv(v4l2_dev);
 231         if (itv == NULL) {
 232                 pr_err("ivtv-alsa itv is NULL\n");
 233                 return 0;
 234         }
 235
 236         s = &itv->streams[IVTV_ENC_STREAM_TYPE_PCM];
 237         if (s->vdev.v4l2_dev == NULL) {
 238                 IVTV_DEBUG_ALSA_INFO("%s: PCM stream for card is disabled - "
 239                                      "skipping\n", __func__);
 240                 return 0;
 241         }
 242
 243         if (itv->alsa != NULL) {
 244                 IVTV_ALSA_ERR("%s: struct snd_ivtv_card * already exists\n",
 245                               __func__);
 246                 return 0;
 247         }
 248
 249         if (snd_ivtv_init(v4l2_dev)) {
 250                 IVTV_ALSA_ERR("%s: failed to create struct snd_ivtv_card\n",
 251                               __func__);
 252         } else {
 253                 IVTV_DEBUG_ALSA_INFO("%s: created ivtv ALSA interface instance "
 254                                      "\n", __func__);
 255         }
 256         return 0;
 257 }
 258
 259 static int __init ivtv_alsa_init(void)
 260 {
 261         pr_info("ivtv-alsa: module loading...\n");
 262         ivtv_ext_init = &ivtv_alsa_load;
 263         return 0;
 264 }
 265
 266 static void __exit snd_ivtv_exit(struct snd_ivtv_card *itvsc)
 267 {
 268         struct ivtv *itv = to_ivtv(itvsc->v4l2_dev);
 269
 270         /* FIXME - pointer checks & shutdown itvsc */
 271
 272         snd_card_free(itvsc->sc);
 273         itv->alsa = NULL;
 274 }
 275
 276 static int __exit ivtv_alsa_exit_callback(struct device *dev, void *data)
 277 {
 278         struct v4l2_device *v4l2_dev = dev_get_drvdata(dev);
 279         struct snd_ivtv_card *itvsc;
 280
 281         if (v4l2_dev == NULL) {
 282                 pr_err("ivtv-alsa: %s: struct v4l2_device * is NULL\n",
 283                        __func__);
 284                 return 0;
 285         }
 286
 287         itvsc = to_snd_ivtv_card(v4l2_dev);
 288         if (itvsc == NULL) {
 289                 IVTV_ALSA_WARN("%s: struct snd_ivtv_card * is NULL\n",
 290                                __func__);
 291                 return 0;
 292         }
 293
 294         snd_ivtv_exit(itvsc);
 295         return 0;
 296 }
 297
 298 static void __exit ivtv_alsa_exit(void)
 299 {
 300         struct device_driver *drv;
 301         int ret;
 302
 303         pr_info("ivtv-alsa: module unloading...\n");
 304
 305         drv = driver_find("ivtv", &pci_bus_type);
 306         ret = driver_for_each_device(drv, NULL, NULL, ivtv_alsa_exit_callback);
 307         (void)ret;      /* suppress compiler warning */
 308
 309         ivtv_ext_init = NULL;
 310         pr_info("ivtv-alsa: module unload complete\n");
 311 }
 312
 313 module_init(ivtv_alsa_init);
 314 module_exit(ivtv_alsa_exit);