drivers/staging/media/solo6x10/solo6x10-g723.c

   1 /*
   2  * Copyright (C) 2010-2013 Bluecherry, LLC <http://www.bluecherrydvr.com>
   3  *
   4  * Original author:
   5  * Ben Collins <bcollins@ubuntu.com>
   6  *
   7  * Additional work by:
   8  * John Brooks <john.brooks@bluecherry.net>
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation; either version 2 of the License, or
  13  * (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with this program; if not, write to the Free Software
  22  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  23  */
  24
  25 #include <linux/kernel.h>
  26 #include <linux/mempool.h>
  27 #include <linux/poll.h>
  28 #include <linux/kthread.h>
  29 #include <linux/freezer.h>
  30 #include <linux/module.h>
  31 #include <linux/slab.h>
  32
  33 #include <sound/core.h>
  34 #include <sound/initval.h>
  35 #include <sound/pcm.h>
  36 #include <sound/control.h>
  37
  38 #include "solo6x10.h"
  39 #include "solo6x10-tw28.h"
  40
  41 #define G723_FDMA_PAGES         32
  42 #define G723_PERIOD_BYTES       48
  43 #define G723_PERIOD_BLOCK       1024
  44 #define G723_FRAMES_PER_PAGE    48
  45
  46 /* Sets up channels 16-19 for decoding and 0-15 for encoding */
  47 #define OUTMODE_MASK            0x300
  48
  49 #define SAMPLERATE              8000
  50 #define BITRATE                 25
  51
  52 /* The solo writes to 1k byte pages, 32 pages, in the dma. Each 1k page
  53  * is broken down to 20 * 48 byte regions (one for each channel possible)
  54  * with the rest of the page being dummy data. */
  55 #define G723_MAX_BUFFER         (G723_PERIOD_BYTES * PERIODS_MAX)
  56 #define G723_INTR_ORDER         4 /* 0 - 4 */
  57 #define PERIODS_MIN             (1 << G723_INTR_ORDER)
  58 #define PERIODS_MAX             G723_FDMA_PAGES
  59
  60 struct solo_snd_pcm {
  61         int                             on;
  62         spinlock_t                      lock;
  63         struct solo_dev         *solo_dev;
  64         unsigned char                   *g723_buf;
  65         dma_addr_t                      g723_dma;
  66 };
  67
  68 static void solo_g723_config(struct solo_dev *solo_dev)
  69 {
  70         int clk_div;
  71
  72         clk_div = (solo_dev->clock_mhz * 1000000)
  73                 / (SAMPLERATE * (BITRATE * 2) * 2);
  74
  75         solo_reg_write(solo_dev, SOLO_AUDIO_SAMPLE,
  76                        SOLO_AUDIO_BITRATE(BITRATE)
  77                        | SOLO_AUDIO_CLK_DIV(clk_div));
  78
  79         solo_reg_write(solo_dev, SOLO_AUDIO_FDMA_INTR,
  80                        SOLO_AUDIO_FDMA_INTERVAL(1)
  81                        | SOLO_AUDIO_INTR_ORDER(G723_INTR_ORDER)
  82                        | SOLO_AUDIO_FDMA_BASE(SOLO_G723_EXT_ADDR(solo_dev) >> 16));
  83
  84         solo_reg_write(solo_dev, SOLO_AUDIO_CONTROL,
  85                        SOLO_AUDIO_ENABLE
  86                        | SOLO_AUDIO_I2S_MODE
  87                        | SOLO_AUDIO_I2S_MULTI(3)
  88                        | SOLO_AUDIO_MODE(OUTMODE_MASK));
  89 }
  90
  91 void solo_g723_isr(struct solo_dev *solo_dev)
  92 {
  93         struct snd_pcm_str *pstr =
  94                 &solo_dev->snd_pcm->streams[SNDRV_PCM_STREAM_CAPTURE];
  95         struct snd_pcm_substream *ss;
  96         struct solo_snd_pcm *solo_pcm;
  97
  98         for (ss = pstr->substream; ss != NULL; ss = ss->next) {
  99                 if (snd_pcm_substream_chip(ss) == NULL)
 100                         continue;
 101
 102                 /* This means open() hasn't been called on this one */
 103                 if (snd_pcm_substream_chip(ss) == solo_dev)
 104                         continue;
 105
 106                 /* Haven't triggered a start yet */
 107                 solo_pcm = snd_pcm_substream_chip(ss);
 108                 if (!solo_pcm->on)
 109                         continue;
 110
 111                 snd_pcm_period_elapsed(ss);
 112         }
 113 }
 114
 115 static int snd_solo_hw_params(struct snd_pcm_substream *ss,
 116                               struct snd_pcm_hw_params *hw_params)
 117 {
 118         return snd_pcm_lib_malloc_pages(ss, params_buffer_bytes(hw_params));
 119 }
 120
 121 static int snd_solo_hw_free(struct snd_pcm_substream *ss)
 122 {
 123         return snd_pcm_lib_free_pages(ss);
 124 }
 125
 126 static const struct snd_pcm_hardware snd_solo_pcm_hw = {
 127         .info                   = (SNDRV_PCM_INFO_MMAP |
 128                                    SNDRV_PCM_INFO_INTERLEAVED |
 129                                    SNDRV_PCM_INFO_BLOCK_TRANSFER |
 130                                    SNDRV_PCM_INFO_MMAP_VALID),
 131         .formats                = SNDRV_PCM_FMTBIT_U8,
 132         .rates                  = SNDRV_PCM_RATE_8000,
 133         .rate_min               = SAMPLERATE,
 134         .rate_max               = SAMPLERATE,
 135         .channels_min           = 1,
 136         .channels_max           = 1,
 137         .buffer_bytes_max       = G723_MAX_BUFFER,
 138         .period_bytes_min       = G723_PERIOD_BYTES,
 139         .period_bytes_max       = G723_PERIOD_BYTES,
 140         .periods_min            = PERIODS_MIN,
 141         .periods_max            = PERIODS_MAX,
 142 };
 143
 144 static int snd_solo_pcm_open(struct snd_pcm_substream *ss)
 145 {
 146         struct solo_dev *solo_dev = snd_pcm_substream_chip(ss);
 147         struct solo_snd_pcm *solo_pcm;
 148
 149         solo_pcm = kzalloc(sizeof(*solo_pcm), GFP_KERNEL);
 150         if (solo_pcm == NULL)
 151                 goto oom;
 152
 153         solo_pcm->g723_buf = pci_alloc_consistent(solo_dev->pdev,
 154                                                   G723_PERIOD_BYTES,
 155                                                   &solo_pcm->g723_dma);
 156         if (solo_pcm->g723_buf == NULL)
 157                 goto oom;
 158
 159         spin_lock_init(&solo_pcm->lock);
 160         solo_pcm->solo_dev = solo_dev;
 161         ss->runtime->hw = snd_solo_pcm_hw;
 162
 163         snd_pcm_substream_chip(ss) = solo_pcm;
 164
 165         return 0;
 166
 167 oom:
 168         kfree(solo_pcm);
 169         return -ENOMEM;
 170 }
 171
 172 static int snd_solo_pcm_close(struct snd_pcm_substream *ss)
 173 {
 174         struct solo_snd_pcm *solo_pcm = snd_pcm_substream_chip(ss);
 175
 176         snd_pcm_substream_chip(ss) = solo_pcm->solo_dev;
 177         pci_free_consistent(solo_pcm->solo_dev->pdev, G723_PERIOD_BYTES,
 178                             solo_pcm->g723_buf, solo_pcm->g723_dma);
 179         kfree(solo_pcm);
 180
 181         return 0;
 182 }
 183
 184 static int snd_solo_pcm_trigger(struct snd_pcm_substream *ss, int cmd)
 185 {
 186         struct solo_snd_pcm *solo_pcm = snd_pcm_substream_chip(ss);
 187         struct solo_dev *solo_dev = solo_pcm->solo_dev;
 188         int ret = 0;
 189
 190         spin_lock(&solo_pcm->lock);
 191
 192         switch (cmd) {
 193         case SNDRV_PCM_TRIGGER_START:
 194                 if (solo_pcm->on == 0) {
 195                         /* If this is the first user, switch on interrupts */
 196                         if (atomic_inc_return(&solo_dev->snd_users) == 1)
 197                                 solo_irq_on(solo_dev, SOLO_IRQ_G723);
 198                         solo_pcm->on = 1;
 199                 }
 200                 break;
 201         case SNDRV_PCM_TRIGGER_STOP:
 202                 if (solo_pcm->on) {
 203                         /* If this was our last user, switch them off */
 204                         if (atomic_dec_return(&solo_dev->snd_users) == 0)
 205                                 solo_irq_off(solo_dev, SOLO_IRQ_G723);
 206                         solo_pcm->on = 0;
 207                 }
 208                 break;
 209         default:
 210                 ret = -EINVAL;
 211         }
 212
 213         spin_unlock(&solo_pcm->lock);
 214
 215         return ret;
 216 }
 217
 218 static int snd_solo_pcm_prepare(struct snd_pcm_substream *ss)
 219 {
 220         return 0;
 221 }
 222
 223 static snd_pcm_uframes_t snd_solo_pcm_pointer(struct snd_pcm_substream *ss)
 224 {
 225         struct solo_snd_pcm *solo_pcm = snd_pcm_substream_chip(ss);
 226         struct solo_dev *solo_dev = solo_pcm->solo_dev;
 227         snd_pcm_uframes_t idx = solo_reg_read(solo_dev, SOLO_AUDIO_STA) & 0x1f;
 228
 229         return idx * G723_FRAMES_PER_PAGE;
 230 }
 231
 232 static int snd_solo_pcm_copy(struct snd_pcm_substream *ss, int channel,
 233                              snd_pcm_uframes_t pos, void __user *dst,
 234                              snd_pcm_uframes_t count)
 235 {
 236         struct solo_snd_pcm *solo_pcm = snd_pcm_substream_chip(ss);
 237         struct solo_dev *solo_dev = solo_pcm->solo_dev;
 238         int err, i;
 239
 240         for (i = 0; i < (count / G723_FRAMES_PER_PAGE); i++) {
 241                 int page = (pos / G723_FRAMES_PER_PAGE) + i;
 242
 243                 err = solo_p2m_dma_t(solo_dev, 0, solo_pcm->g723_dma,
 244                                      SOLO_G723_EXT_ADDR(solo_dev) +
 245                                      (page * G723_PERIOD_BLOCK) +
 246                                      (ss->number * G723_PERIOD_BYTES),
 247                                      G723_PERIOD_BYTES, 0, 0);
 248                 if (err)
 249                         return err;
 250
 251                 err = copy_to_user(dst + (i * G723_PERIOD_BYTES),
 252                                    solo_pcm->g723_buf, G723_PERIOD_BYTES);
 253
 254                 if (err)
 255                         return -EFAULT;
 256         }
 257
 258         return 0;
 259 }
 260
 261 static struct snd_pcm_ops snd_solo_pcm_ops = {
 262         .open = snd_solo_pcm_open,
 263         .close = snd_solo_pcm_close,
 264         .ioctl = snd_pcm_lib_ioctl,
 265         .hw_params = snd_solo_hw_params,
 266         .hw_free = snd_solo_hw_free,
 267         .prepare = snd_solo_pcm_prepare,
 268         .trigger = snd_solo_pcm_trigger,
 269         .pointer = snd_solo_pcm_pointer,
 270         .copy = snd_solo_pcm_copy,
 271 };
 272
 273 static int snd_solo_capture_volume_info(struct snd_kcontrol *kcontrol,
 274                                         struct snd_ctl_elem_info *info)
 275 {
 276         info->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
 277         info->count = 1;
 278         info->value.integer.min = 0;
 279         info->value.integer.max = 15;
 280         info->value.integer.step = 1;
 281
 282         return 0;
 283 }
 284
 285 static int snd_solo_capture_volume_get(struct snd_kcontrol *kcontrol,
 286                                        struct snd_ctl_elem_value *value)
 287 {
 288         struct solo_dev *solo_dev = snd_kcontrol_chip(kcontrol);
 289         u8 ch = value->id.numid - 1;
 290
 291         value->value.integer.value[0] = tw28_get_audio_gain(solo_dev, ch);
 292
 293         return 0;
 294 }
 295
 296 static int snd_solo_capture_volume_put(struct snd_kcontrol *kcontrol,
 297                                        struct snd_ctl_elem_value *value)
 298 {
 299         struct solo_dev *solo_dev = snd_kcontrol_chip(kcontrol);
 300         u8 ch = value->id.numid - 1;
 301         u8 old_val;
 302
 303         old_val = tw28_get_audio_gain(solo_dev, ch);
 304         if (old_val == value->value.integer.value[0])
 305                 return 0;
 306
 307         tw28_set_audio_gain(solo_dev, ch, value->value.integer.value[0]);
 308
 309         return 1;
 310 }
 311
 312 static struct snd_kcontrol_new snd_solo_capture_volume = {
 313         .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
 314         .name = "Capture Volume",
 315         .info = snd_solo_capture_volume_info,
 316         .get = snd_solo_capture_volume_get,
 317         .put = snd_solo_capture_volume_put,
 318 };
 319
 320 static int solo_snd_pcm_init(struct solo_dev *solo_dev)
 321 {
 322         struct snd_card *card = solo_dev->snd_card;
 323         struct snd_pcm *pcm;
 324         struct snd_pcm_substream *ss;
 325         int ret;
 326         int i;
 327
 328         ret = snd_pcm_new(card, card->driver, 0, 0, solo_dev->nr_chans,
 329                           &pcm);
 330         if (ret < 0)
 331                 return ret;
 332
 333         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE,
 334                         &snd_solo_pcm_ops);
 335
 336         snd_pcm_chip(pcm) = solo_dev;
 337         pcm->info_flags = 0;
 338         strcpy(pcm->name, card->shortname);
 339
 340         for (i = 0, ss = pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream;
 341              ss; ss = ss->next, i++)
 342                 sprintf(ss->name, "Camera #%d Audio", i);
 343
 344         ret = snd_pcm_lib_preallocate_pages_for_all(pcm,
 345                                         SNDRV_DMA_TYPE_CONTINUOUS,
 346                                         snd_dma_continuous_data(GFP_KERNEL),
 347                                         G723_MAX_BUFFER, G723_MAX_BUFFER);
 348         if (ret < 0)
 349                 return ret;
 350
 351         solo_dev->snd_pcm = pcm;
 352
 353         return 0;
 354 }
 355
 356 int solo_g723_init(struct solo_dev *solo_dev)
 357 {
 358         static struct snd_device_ops ops = { NULL };
 359         struct snd_card *card;
 360         struct snd_kcontrol_new kctl;
 361         char name[32];
 362         int ret;
 363
 364         atomic_set(&solo_dev->snd_users, 0);
 365
 366         /* Allows for easier mapping between video and audio */
 367         sprintf(name, "Softlogic%d", solo_dev->vfd->num);
 368
 369         ret = snd_card_create(SNDRV_DEFAULT_IDX1, name, THIS_MODULE, 0,
 370                               &solo_dev->snd_card);
 371         if (ret < 0)
 372                 return ret;
 373
 374         card = solo_dev->snd_card;
 375
 376         strcpy(card->driver, SOLO6X10_NAME);
 377         strcpy(card->shortname, "SOLO-6x10 Audio");
 378         sprintf(card->longname, "%s on %s IRQ %d", card->shortname,
 379                 pci_name(solo_dev->pdev), solo_dev->pdev->irq);
 380         snd_card_set_dev(card, &solo_dev->pdev->dev);
 381
 382         ret = snd_device_new(card, SNDRV_DEV_LOWLEVEL, solo_dev, &ops);
 383         if (ret < 0)
 384                 goto snd_error;
 385
 386         /* Mixer controls */
 387         strcpy(card->mixername, "SOLO-6x10");
 388         kctl = snd_solo_capture_volume;
 389         kctl.count = solo_dev->nr_chans;
 390
 391         ret = snd_ctl_add(card, snd_ctl_new1(&kctl, solo_dev));
 392         if (ret < 0)
 393                 return ret;
 394
 395         ret = solo_snd_pcm_init(solo_dev);
 396         if (ret < 0)
 397                 goto snd_error;
 398
 399         ret = snd_card_register(card);
 400         if (ret < 0)
 401                 goto snd_error;
 402
 403         solo_g723_config(solo_dev);
 404
 405         dev_info(&solo_dev->pdev->dev, "Alsa sound card as %s\n", name);
 406
 407         return 0;
 408
 409 snd_error:
 410         snd_card_free(card);
 411         return ret;
 412 }
 413
 414 void solo_g723_exit(struct solo_dev *solo_dev)
 415 {
 416         if (!solo_dev->snd_card)
 417                 return;
 418
 419         solo_reg_write(solo_dev, SOLO_AUDIO_CONTROL, 0);
 420         solo_irq_off(solo_dev, SOLO_IRQ_G723);
 421
 422         snd_card_free(solo_dev->snd_card);
 423         solo_dev->snd_card = NULL;
 424 }