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