drivers/staging/solo6x10/g723.c

   1 /*
   2  * Copyright (C) 2010 Bluecherry, LLC www.bluecherrydvr.com
   3  * Copyright (C) 2010 Ben Collins <bcollins@bluecherry.net>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  18  */
  19
  20 #include <linux/kernel.h>
  21 #include <linux/mempool.h>
  22 #include <linux/poll.h>
  23 #include <linux/kthread.h>
  24 #include <linux/slab.h>
  25 #include <linux/freezer.h>
  26 #include <sound/core.h>
  27 #include <sound/initval.h>
  28 #include <sound/pcm.h>
  29 #include <sound/control.h>
  30 #include "solo6x10.h"
  31 #include "tw28.h"
  32
  33 #define G723_INTR_ORDER         0
  34 #define G723_FDMA_PAGES         32
  35 #define G723_PERIOD_BYTES       48
  36 #define G723_PERIOD_BLOCK       1024
  37 #define G723_FRAMES_PER_PAGE    48
  38
  39 /* Sets up channels 16-19 for decoding and 0-15 for encoding */
  40 #define OUTMODE_MASK            0x300
  41
  42 #define SAMPLERATE              8000
  43 #define BITRATE                 25
  44
  45 /* The solo writes to 1k byte pages, 32 pages, in the dma. Each 1k page
  46  * is broken down to 20 * 48 byte regions (one for each channel possible)
  47  * with the rest of the page being dummy data. */
  48 #define MAX_BUFFER              (G723_PERIOD_BYTES * PERIODS_MAX)
  49 #define IRQ_PAGES               4 /* 0 - 4 */
  50 #define PERIODS_MIN             (1 << IRQ_PAGES)
  51 #define PERIODS_MAX             G723_FDMA_PAGES
  52
  53 struct solo_snd_pcm {
  54         int             on;
  55         spinlock_t      lock;
  56         struct solo_dev *solo_dev;
  57         unsigned char   g723_buf[G723_PERIOD_BYTES];
  58 };
  59
  60 static void solo_g723_config(struct solo_dev *solo_dev)
  61 {
  62         int clk_div;
  63
  64         clk_div = SOLO_CLOCK_MHZ / (SAMPLERATE * (BITRATE * 2) * 2);
  65
  66         solo_reg_write(solo_dev, SOLO_AUDIO_SAMPLE,
  67                        SOLO_AUDIO_BITRATE(BITRATE) |
  68                        SOLO_AUDIO_CLK_DIV(clk_div));
  69
  70         solo_reg_write(solo_dev, SOLO_AUDIO_FDMA_INTR,
  71                       SOLO_AUDIO_FDMA_INTERVAL(IRQ_PAGES) |
  72                       SOLO_AUDIO_INTR_ORDER(G723_INTR_ORDER) |
  73                       SOLO_AUDIO_FDMA_BASE(SOLO_G723_EXT_ADDR(solo_dev) >> 16));
  74
  75         solo_reg_write(solo_dev, SOLO_AUDIO_CONTROL,
  76                        SOLO_AUDIO_ENABLE | SOLO_AUDIO_I2S_MODE |
  77                        SOLO_AUDIO_I2S_MULTI(3) | SOLO_AUDIO_MODE(OUTMODE_MASK));
  78 }
  79
  80 void solo_g723_isr(struct solo_dev *solo_dev)
  81 {
  82         struct snd_pcm_str *pstr =
  83                 &solo_dev->snd_pcm->streams[SNDRV_PCM_STREAM_CAPTURE];
  84         struct snd_pcm_substream *ss;
  85         struct solo_snd_pcm *solo_pcm;
  86
  87         solo_reg_write(solo_dev, SOLO_IRQ_STAT, SOLO_IRQ_G723);
  88
  89         for (ss = pstr->substream; ss != NULL; ss = ss->next) {
  90                 if (snd_pcm_substream_chip(ss) == NULL)
  91                         continue;
  92
  93                 /* This means open() hasn't been called on this one */
  94                 if (snd_pcm_substream_chip(ss) == solo_dev)
  95                         continue;
  96
  97                 /* Haven't triggered a start yet */
  98                 solo_pcm = snd_pcm_substream_chip(ss);
  99                 if (!solo_pcm->on)
 100                         continue;
 101
 102                 snd_pcm_period_elapsed(ss);
 103         }
 104 }
 105
 106 static int snd_solo_hw_params(struct snd_pcm_substream *ss,
 107                               struct snd_pcm_hw_params *hw_params)
 108 {
 109         return snd_pcm_lib_malloc_pages(ss, params_buffer_bytes(hw_params));
 110 }
 111
 112 static int snd_solo_hw_free(struct snd_pcm_substream *ss)
 113 {
 114         return snd_pcm_lib_free_pages(ss);
 115 }
 116
 117 static struct snd_pcm_hardware snd_solo_pcm_hw = {
 118         .info                   = (SNDRV_PCM_INFO_MMAP |
 119                                    SNDRV_PCM_INFO_INTERLEAVED |
 120                                    SNDRV_PCM_INFO_BLOCK_TRANSFER |
 121                                    SNDRV_PCM_INFO_MMAP_VALID),
 122         .formats                = SNDRV_PCM_FMTBIT_U8,
 123         .rates                  = SNDRV_PCM_RATE_8000,
 124         .rate_min               = 8000,
 125         .rate_max               = 8000,
 126         .channels_min           = 1,
 127         .channels_max           = 1,
 128         .buffer_bytes_max       = MAX_BUFFER,
 129         .period_bytes_min       = G723_PERIOD_BYTES,
 130         .period_bytes_max       = G723_PERIOD_BYTES,
 131         .periods_min            = PERIODS_MIN,
 132         .periods_max            = PERIODS_MAX,
 133 };
 134
 135 static int snd_solo_pcm_open(struct snd_pcm_substream *ss)
 136 {
 137         struct solo_dev *solo_dev = snd_pcm_substream_chip(ss);
 138         struct solo_snd_pcm *solo_pcm;
 139
 140         solo_pcm = kzalloc(sizeof(*solo_pcm), GFP_KERNEL);
 141         if (solo_pcm == NULL)
 142                 return -ENOMEM;
 143
 144         spin_lock_init(&solo_pcm->lock);
 145         solo_pcm->solo_dev = solo_dev;
 146         ss->runtime->hw = snd_solo_pcm_hw;
 147
 148         snd_pcm_substream_chip(ss) = solo_pcm;
 149
 150         return 0;
 151 }
 152
 153 static int snd_solo_pcm_close(struct snd_pcm_substream *ss)
 154 {
 155         struct solo_snd_pcm *solo_pcm = snd_pcm_substream_chip(ss);
 156
 157         snd_pcm_substream_chip(ss) = solo_pcm->solo_dev;
 158         kfree(solo_pcm);
 159
 160         return 0;
 161 }
 162
 163 static int snd_solo_pcm_trigger(struct snd_pcm_substream *ss, int cmd)
 164 {
 165         struct solo_snd_pcm *solo_pcm = snd_pcm_substream_chip(ss);
 166         struct solo_dev *solo_dev = solo_pcm->solo_dev;
 167         int ret = 0;
 168
 169         spin_lock(&solo_pcm->lock);
 170
 171         switch (cmd) {
 172         case SNDRV_PCM_TRIGGER_START:
 173                 if (solo_pcm->on == 0) {
 174                         /* If this is the first user, switch on interrupts */
 175                         if (atomic_inc_return(&solo_dev->snd_users) == 1)
 176                                 solo_irq_on(solo_dev, SOLO_IRQ_G723);
 177                         solo_pcm->on = 1;
 178                 }
 179                 break;
 180         case SNDRV_PCM_TRIGGER_STOP:
 181                 if (solo_pcm->on) {
 182                         /* If this was our last user, switch them off */
 183                         if (atomic_dec_return(&solo_dev->snd_users) == 0)
 184                                 solo_irq_off(solo_dev, SOLO_IRQ_G723);
 185                         solo_pcm->on = 0;
 186                 }
 187                 break;
 188         default:
 189                 ret = -EINVAL;
 190         }
 191
 192         spin_unlock(&solo_pcm->lock);
 193
 194         return ret;
 195 }
 196
 197 static int snd_solo_pcm_prepare(struct snd_pcm_substream *ss)
 198 {
 199         return 0;
 200 }
 201
 202 static snd_pcm_uframes_t snd_solo_pcm_pointer(struct snd_pcm_substream *ss)
 203 {
 204         struct solo_snd_pcm *solo_pcm = snd_pcm_substream_chip(ss);
 205         struct solo_dev *solo_dev = solo_pcm->solo_dev;
 206         snd_pcm_uframes_t idx = solo_reg_read(solo_dev, SOLO_AUDIO_STA) & 0x1f;
 207
 208         return idx * G723_FRAMES_PER_PAGE;
 209 }
 210
 211 static int snd_solo_pcm_copy(struct snd_pcm_substream *ss, int channel,
 212                              snd_pcm_uframes_t pos, void __user *dst,
 213                              snd_pcm_uframes_t count)
 214 {
 215         struct solo_snd_pcm *solo_pcm = snd_pcm_substream_chip(ss);
 216         struct solo_dev *solo_dev = solo_pcm->solo_dev;
 217         int err, i;
 218
 219         for (i = 0; i < (count / G723_FRAMES_PER_PAGE); i++) {
 220                 int page = (pos / G723_FRAMES_PER_PAGE) + i;
 221
 222                 err = solo_p2m_dma(solo_dev, SOLO_P2M_DMA_ID_G723E, 0,
 223                                    solo_pcm->g723_buf,
 224                                    SOLO_G723_EXT_ADDR(solo_dev) +
 225                                    (page * G723_PERIOD_BLOCK) +
 226                                    (ss->number * G723_PERIOD_BYTES),
 227                                    G723_PERIOD_BYTES);
 228                 if (err)
 229                         return err;
 230
 231                 err = copy_to_user(dst + (i * G723_PERIOD_BYTES),
 232                                    solo_pcm->g723_buf, G723_PERIOD_BYTES);
 233
 234                 if (err)
 235                         return -EFAULT;
 236         }
 237
 238         return 0;
 239 }
 240
 241 static struct snd_pcm_ops snd_solo_pcm_ops = {
 242         .open = snd_solo_pcm_open,
 243         .close = snd_solo_pcm_close,
 244         .ioctl = snd_pcm_lib_ioctl,
 245         .hw_params = snd_solo_hw_params,
 246         .hw_free = snd_solo_hw_free,
 247         .prepare = snd_solo_pcm_prepare,
 248         .trigger = snd_solo_pcm_trigger,
 249         .pointer = snd_solo_pcm_pointer,
 250         .copy = snd_solo_pcm_copy,
 251 };
 252
 253 static int snd_solo_capture_volume_info(struct snd_kcontrol *kcontrol,
 254                                         struct snd_ctl_elem_info *info)
 255 {
 256         info->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
 257         info->count = 1;
 258         info->value.integer.min = 0;
 259         info->value.integer.max = 15;
 260         info->value.integer.step = 1;
 261
 262         return 0;
 263 }
 264
 265 static int snd_solo_capture_volume_get(struct snd_kcontrol *kcontrol,
 266                                        struct snd_ctl_elem_value *value)
 267 {
 268         struct solo_dev *solo_dev = snd_kcontrol_chip(kcontrol);
 269         u8 ch = value->id.numid - 1;
 270
 271         value->value.integer.value[0] = tw28_get_audio_gain(solo_dev, ch);
 272
 273         return 0;
 274 }
 275
 276 static int snd_solo_capture_volume_put(struct snd_kcontrol *kcontrol,
 277                                        struct snd_ctl_elem_value *value)
 278 {
 279         struct solo_dev *solo_dev = snd_kcontrol_chip(kcontrol);
 280         u8 ch = value->id.numid - 1;
 281         u8 old_val;
 282
 283         old_val = tw28_get_audio_gain(solo_dev, ch);
 284         if (old_val == value->value.integer.value[0])
 285                 return 0;
 286
 287         tw28_set_audio_gain(solo_dev, ch, value->value.integer.value[0]);
 288
 289         return 1;
 290 }
 291
 292 static struct snd_kcontrol_new snd_solo_capture_volume = {
 293         .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
 294         .name = "Capture Volume",
 295         .info = snd_solo_capture_volume_info,
 296         .get = snd_solo_capture_volume_get,
 297         .put = snd_solo_capture_volume_put,
 298 };
 299
 300 static int solo_snd_pcm_init(struct solo_dev *solo_dev)
 301 {
 302         struct snd_card *card = solo_dev->snd_card;
 303         struct snd_pcm *pcm;
 304         struct snd_pcm_substream *ss;
 305         int ret;
 306         int i;
 307
 308         ret = snd_pcm_new(card, card->driver, 0, 0, solo_dev->nr_chans,
 309                           &pcm);
 310         if (ret < 0)
 311                 return ret;
 312
 313         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE,
 314                         &snd_solo_pcm_ops);
 315
 316         snd_pcm_chip(pcm) = solo_dev;
 317         pcm->info_flags = 0;
 318         strcpy(pcm->name, card->shortname);
 319
 320         for (i = 0, ss = pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream;
 321              ss; ss = ss->next, i++)
 322                 sprintf(ss->name, "Camera #%d Audio", i);
 323
 324         ret = snd_pcm_lib_preallocate_pages_for_all(pcm,
 325                                         SNDRV_DMA_TYPE_CONTINUOUS,
 326                                         snd_dma_continuous_data(GFP_KERNEL),
 327                                         MAX_BUFFER, MAX_BUFFER);
 328         if (ret < 0)
 329                 return ret;
 330
 331         solo_dev->snd_pcm = pcm;
 332
 333         return 0;
 334 }
 335
 336 int solo_g723_init(struct solo_dev *solo_dev)
 337 {
 338         static struct snd_device_ops ops = { NULL };
 339         struct snd_card *card;
 340         struct snd_kcontrol_new kctl;
 341         char name[32];
 342         int ret;
 343
 344         atomic_set(&solo_dev->snd_users, 0);
 345
 346         /* Allows for easier mapping between video and audio */
 347         sprintf(name, "Softlogic%d", solo_dev->vfd->num);
 348
 349         ret = snd_card_create(SNDRV_DEFAULT_IDX1, name, THIS_MODULE, 0,
 350                               &solo_dev->snd_card);
 351         if (ret < 0)
 352                 return ret;
 353
 354         card = solo_dev->snd_card;
 355
 356         strcpy(card->driver, SOLO6X10_NAME);
 357         strcpy(card->shortname, "SOLO-6x10 Audio");
 358         sprintf(card->longname, "%s on %s IRQ %d", card->shortname,
 359                 pci_name(solo_dev->pdev), solo_dev->pdev->irq);
 360         snd_card_set_dev(card, &solo_dev->pdev->dev);
 361
 362         ret = snd_device_new(card, SNDRV_DEV_LOWLEVEL, solo_dev, &ops);
 363         if (ret < 0)
 364                 goto snd_error;
 365
 366         /* Mixer controls */
 367         strcpy(card->mixername, "SOLO-6x10");
 368         kctl = snd_solo_capture_volume;
 369         kctl.count = solo_dev->nr_chans;
 370         ret = snd_ctl_add(card, snd_ctl_new1(&kctl, solo_dev));
 371         if (ret < 0)
 372                 return ret;
 373
 374         ret = solo_snd_pcm_init(solo_dev);
 375         if (ret < 0)
 376                 goto snd_error;
 377
 378         ret = snd_card_register(card);
 379         if (ret < 0)
 380                 goto snd_error;
 381
 382         solo_g723_config(solo_dev);
 383
 384         dev_info(&solo_dev->pdev->dev, "Alsa sound card as %s\n", name);
 385
 386         return 0;
 387
 388 snd_error:
 389         snd_card_free(card);
 390         return ret;
 391 }
 392
 393 void solo_g723_exit(struct solo_dev *solo_dev)
 394 {
 395         solo_reg_write(solo_dev, SOLO_AUDIO_CONTROL, 0);
 396         solo_irq_off(solo_dev, SOLO_IRQ_G723);
 397
 398         snd_card_free(solo_dev->snd_card);
 399 }