drivers/staging/media/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 <linux/export.h>
  27 #include <sound/core.h>
  28 #include <sound/initval.h>
  29 #include <sound/pcm.h>
  30 #include <sound/control.h>
  31 #include "solo6x10.h"
  32 #include "tw28.h"
  33
  34 #define G723_INTR_ORDER         0
  35 #define G723_FDMA_PAGES         32
  36 #define G723_PERIOD_BYTES       48
  37 #define G723_PERIOD_BLOCK       1024
  38 #define G723_FRAMES_PER_PAGE    48
  39
  40 /* Sets up channels 16-19 for decoding and 0-15 for encoding */
  41 #define OUTMODE_MASK            0x300
  42
  43 #define SAMPLERATE              8000
  44 #define BITRATE                 25
  45
  46 /* The solo writes to 1k byte pages, 32 pages, in the dma. Each 1k page
  47  * is broken down to 20 * 48 byte regions (one for each channel possible)
  48  * with the rest of the page being dummy data. */
  49 #define MAX_BUFFER              (G723_PERIOD_BYTES * PERIODS_MAX)
  50 #define IRQ_PAGES               4 /* 0 - 4 */
  51 #define PERIODS_MIN             (1 << IRQ_PAGES)
  52 #define PERIODS_MAX             G723_FDMA_PAGES
  53
  54 struct solo_snd_pcm {
  55         int             on;
  56         spinlock_t      lock;
  57         struct solo_dev *solo_dev;
  58         unsigned char   g723_buf[G723_PERIOD_BYTES];
  59 };
  60
  61 static void solo_g723_config(struct solo_dev *solo_dev)
  62 {
  63         int clk_div;
  64
  65         clk_div = SOLO_CLOCK_MHZ / (SAMPLERATE * (BITRATE * 2) * 2);
  66
  67         solo_reg_write(solo_dev, SOLO_AUDIO_SAMPLE,
  68                        SOLO_AUDIO_BITRATE(BITRATE) |
  69                        SOLO_AUDIO_CLK_DIV(clk_div));
  70
  71         solo_reg_write(solo_dev, SOLO_AUDIO_FDMA_INTR,
  72                       SOLO_AUDIO_FDMA_INTERVAL(IRQ_PAGES) |
  73                       SOLO_AUDIO_INTR_ORDER(G723_INTR_ORDER) |
  74                       SOLO_AUDIO_FDMA_BASE(SOLO_G723_EXT_ADDR(solo_dev) >> 16));
  75
  76         solo_reg_write(solo_dev, SOLO_AUDIO_CONTROL,
  77                        SOLO_AUDIO_ENABLE | SOLO_AUDIO_I2S_MODE |
  78                        SOLO_AUDIO_I2S_MULTI(3) | SOLO_AUDIO_MODE(OUTMODE_MASK));
  79 }
  80
  81 void solo_g723_isr(struct solo_dev *solo_dev)
  82 {
  83         struct snd_pcm_str *pstr =
  84                 &solo_dev->snd_pcm->streams[SNDRV_PCM_STREAM_CAPTURE];
  85         struct snd_pcm_substream *ss;
  86         struct solo_snd_pcm *solo_pcm;
  87
  88         solo_reg_write(solo_dev, SOLO_IRQ_STAT, SOLO_IRQ_G723);
  89
  90         for (ss = pstr->substream; ss != NULL; ss = ss->next) {
  91                 if (snd_pcm_substream_chip(ss) == NULL)
  92                         continue;
  93
  94                 /* This means open() hasn't been called on this one */
  95                 if (snd_pcm_substream_chip(ss) == solo_dev)
  96                         continue;
  97
  98                 /* Haven't triggered a start yet */
  99                 solo_pcm = snd_pcm_substream_chip(ss);
 100                 if (!solo_pcm->on)
 101                         continue;
 102
 103                 snd_pcm_period_elapsed(ss);
 104         }
 105 }
 106
 107 static int snd_solo_hw_params(struct snd_pcm_substream *ss,
 108                               struct snd_pcm_hw_params *hw_params)
 109 {
 110         return snd_pcm_lib_malloc_pages(ss, params_buffer_bytes(hw_params));
 111 }
 112
 113 static int snd_solo_hw_free(struct snd_pcm_substream *ss)
 114 {
 115         return snd_pcm_lib_free_pages(ss);
 116 }
 117
 118 static struct snd_pcm_hardware snd_solo_pcm_hw = {
 119         .info                   = (SNDRV_PCM_INFO_MMAP |
 120                                    SNDRV_PCM_INFO_INTERLEAVED |
 121                                    SNDRV_PCM_INFO_BLOCK_TRANSFER |
 122                                    SNDRV_PCM_INFO_MMAP_VALID),
 123         .formats                = SNDRV_PCM_FMTBIT_U8,
 124         .rates                  = SNDRV_PCM_RATE_8000,
 125         .rate_min               = 8000,
 126         .rate_max               = 8000,
 127         .channels_min           = 1,
 128         .channels_max           = 1,
 129         .buffer_bytes_max       = MAX_BUFFER,
 130         .period_bytes_min       = G723_PERIOD_BYTES,
 131         .period_bytes_max       = G723_PERIOD_BYTES,
 132         .periods_min            = PERIODS_MIN,
 133         .periods_max            = PERIODS_MAX,
 134 };
 135
 136 static int snd_solo_pcm_open(struct snd_pcm_substream *ss)
 137 {
 138         struct solo_dev *solo_dev = snd_pcm_substream_chip(ss);
 139         struct solo_snd_pcm *solo_pcm;
 140
 141         solo_pcm = kzalloc(sizeof(*solo_pcm), GFP_KERNEL);
 142         if (solo_pcm == NULL)
 143                 return -ENOMEM;
 144
 145         spin_lock_init(&solo_pcm->lock);
 146         solo_pcm->solo_dev = solo_dev;
 147         ss->runtime->hw = snd_solo_pcm_hw;
 148
 149         snd_pcm_substream_chip(ss) = solo_pcm;
 150
 151         return 0;
 152 }
 153
 154 static int snd_solo_pcm_close(struct snd_pcm_substream *ss)
 155 {
 156         struct solo_snd_pcm *solo_pcm = snd_pcm_substream_chip(ss);
 157
 158         snd_pcm_substream_chip(ss) = solo_pcm->solo_dev;
 159         kfree(solo_pcm);
 160
 161         return 0;
 162 }
 163
 164 static int snd_solo_pcm_trigger(struct snd_pcm_substream *ss, int cmd)
 165 {
 166         struct solo_snd_pcm *solo_pcm = snd_pcm_substream_chip(ss);
 167         struct solo_dev *solo_dev = solo_pcm->solo_dev;
 168         int ret = 0;
 169
 170         spin_lock(&solo_pcm->lock);
 171
 172         switch (cmd) {
 173         case SNDRV_PCM_TRIGGER_START:
 174                 if (solo_pcm->on == 0) {
 175                         /* If this is the first user, switch on interrupts */
 176                         if (atomic_inc_return(&solo_dev->snd_users) == 1)
 177                                 solo_irq_on(solo_dev, SOLO_IRQ_G723);
 178                         solo_pcm->on = 1;
 179                 }
 180                 break;
 181         case SNDRV_PCM_TRIGGER_STOP:
 182                 if (solo_pcm->on) {
 183                         /* If this was our last user, switch them off */
 184                         if (atomic_dec_return(&solo_dev->snd_users) == 0)
 185                                 solo_irq_off(solo_dev, SOLO_IRQ_G723);
 186                         solo_pcm->on = 0;
 187                 }
 188                 break;
 189         default:
 190                 ret = -EINVAL;
 191         }
 192
 193         spin_unlock(&solo_pcm->lock);
 194
 195         return ret;
 196 }
 197
 198 static int snd_solo_pcm_prepare(struct snd_pcm_substream *ss)
 199 {
 200         return 0;
 201 }
 202
 203 static snd_pcm_uframes_t snd_solo_pcm_pointer(struct snd_pcm_substream *ss)
 204 {
 205         struct solo_snd_pcm *solo_pcm = snd_pcm_substream_chip(ss);
 206         struct solo_dev *solo_dev = solo_pcm->solo_dev;
 207         snd_pcm_uframes_t idx = solo_reg_read(solo_dev, SOLO_AUDIO_STA) & 0x1f;
 208
 209         return idx * G723_FRAMES_PER_PAGE;
 210 }
 211
 212 static int snd_solo_pcm_copy(struct snd_pcm_substream *ss, int channel,
 213                              snd_pcm_uframes_t pos, void __user *dst,
 214                              snd_pcm_uframes_t count)
 215 {
 216         struct solo_snd_pcm *solo_pcm = snd_pcm_substream_chip(ss);
 217         struct solo_dev *solo_dev = solo_pcm->solo_dev;
 218         int err, i;
 219
 220         for (i = 0; i < (count / G723_FRAMES_PER_PAGE); i++) {
 221                 int page = (pos / G723_FRAMES_PER_PAGE) + i;
 222
 223                 err = solo_p2m_dma(solo_dev, SOLO_P2M_DMA_ID_G723E, 0,
 224                                    solo_pcm->g723_buf,
 225                                    SOLO_G723_EXT_ADDR(solo_dev) +
 226                                    (page * G723_PERIOD_BLOCK) +
 227                                    (ss->number * G723_PERIOD_BYTES),
 228                                    G723_PERIOD_BYTES);
 229                 if (err)
 230                         return err;
 231
 232                 err = copy_to_user(dst + (i * G723_PERIOD_BYTES),
 233                                    solo_pcm->g723_buf, G723_PERIOD_BYTES);
 234
 235                 if (err)
 236                         return -EFAULT;
 237         }
 238
 239         return 0;
 240 }
 241
 242 static struct snd_pcm_ops snd_solo_pcm_ops = {
 243         .open = snd_solo_pcm_open,
 244         .close = snd_solo_pcm_close,
 245         .ioctl = snd_pcm_lib_ioctl,
 246         .hw_params = snd_solo_hw_params,
 247         .hw_free = snd_solo_hw_free,
 248         .prepare = snd_solo_pcm_prepare,
 249         .trigger = snd_solo_pcm_trigger,
 250         .pointer = snd_solo_pcm_pointer,
 251         .copy = snd_solo_pcm_copy,
 252 };
 253
 254 static int snd_solo_capture_volume_info(struct snd_kcontrol *kcontrol,
 255                                         struct snd_ctl_elem_info *info)
 256 {
 257         info->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
 258         info->count = 1;
 259         info->value.integer.min = 0;
 260         info->value.integer.max = 15;
 261         info->value.integer.step = 1;
 262
 263         return 0;
 264 }
 265
 266 static int snd_solo_capture_volume_get(struct snd_kcontrol *kcontrol,
 267                                        struct snd_ctl_elem_value *value)
 268 {
 269         struct solo_dev *solo_dev = snd_kcontrol_chip(kcontrol);
 270         u8 ch = value->id.numid - 1;
 271
 272         value->value.integer.value[0] = tw28_get_audio_gain(solo_dev, ch);
 273
 274         return 0;
 275 }
 276
 277 static int snd_solo_capture_volume_put(struct snd_kcontrol *kcontrol,
 278                                        struct snd_ctl_elem_value *value)
 279 {
 280         struct solo_dev *solo_dev = snd_kcontrol_chip(kcontrol);
 281         u8 ch = value->id.numid - 1;
 282         u8 old_val;
 283
 284         old_val = tw28_get_audio_gain(solo_dev, ch);
 285         if (old_val == value->value.integer.value[0])
 286                 return 0;
 287
 288         tw28_set_audio_gain(solo_dev, ch, value->value.integer.value[0]);
 289
 290         return 1;
 291 }
 292
 293 static struct snd_kcontrol_new snd_solo_capture_volume = {
 294         .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
 295         .name = "Capture Volume",
 296         .info = snd_solo_capture_volume_info,
 297         .get = snd_solo_capture_volume_get,
 298         .put = snd_solo_capture_volume_put,
 299 };
 300
 301 static int solo_snd_pcm_init(struct solo_dev *solo_dev)
 302 {
 303         struct snd_card *card = solo_dev->snd_card;
 304         struct snd_pcm *pcm;
 305         struct snd_pcm_substream *ss;
 306         int ret;
 307         int i;
 308
 309         ret = snd_pcm_new(card, card->driver, 0, 0, solo_dev->nr_chans,
 310                           &pcm);
 311         if (ret < 0)
 312                 return ret;
 313
 314         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE,
 315                         &snd_solo_pcm_ops);
 316
 317         snd_pcm_chip(pcm) = solo_dev;
 318         pcm->info_flags = 0;
 319         strcpy(pcm->name, card->shortname);
 320
 321         for (i = 0, ss = pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream;
 322              ss; ss = ss->next, i++)
 323                 sprintf(ss->name, "Camera #%d Audio", i);
 324
 325         ret = snd_pcm_lib_preallocate_pages_for_all(pcm,
 326                                         SNDRV_DMA_TYPE_CONTINUOUS,
 327                                         snd_dma_continuous_data(GFP_KERNEL),
 328                                         MAX_BUFFER, MAX_BUFFER);
 329         if (ret < 0)
 330                 return ret;
 331
 332         solo_dev->snd_pcm = pcm;
 333
 334         return 0;
 335 }
 336
 337 int solo_g723_init(struct solo_dev *solo_dev)
 338 {
 339         static struct snd_device_ops ops = { NULL };
 340         struct snd_card *card;
 341         struct snd_kcontrol_new kctl;
 342         char name[32];
 343         int ret;
 344
 345         atomic_set(&solo_dev->snd_users, 0);
 346
 347         /* Allows for easier mapping between video and audio */
 348         sprintf(name, "Softlogic%d", solo_dev->vfd->num);
 349
 350         ret = snd_card_create(SNDRV_DEFAULT_IDX1, name, THIS_MODULE, 0,
 351                               &solo_dev->snd_card);
 352         if (ret < 0)
 353                 return ret;
 354
 355         card = solo_dev->snd_card;
 356
 357         strcpy(card->driver, SOLO6X10_NAME);
 358         strcpy(card->shortname, "SOLO-6x10 Audio");
 359         sprintf(card->longname, "%s on %s IRQ %d", card->shortname,
 360                 pci_name(solo_dev->pdev), solo_dev->pdev->irq);
 361         snd_card_set_dev(card, &solo_dev->pdev->dev);
 362
 363         ret = snd_device_new(card, SNDRV_DEV_LOWLEVEL, solo_dev, &ops);
 364         if (ret < 0)
 365                 goto snd_error;
 366
 367         /* Mixer controls */
 368         strcpy(card->mixername, "SOLO-6x10");
 369         kctl = snd_solo_capture_volume;
 370         kctl.count = solo_dev->nr_chans;
 371         ret = snd_ctl_add(card, snd_ctl_new1(&kctl, solo_dev));
 372         if (ret < 0)
 373                 return ret;
 374
 375         ret = solo_snd_pcm_init(solo_dev);
 376         if (ret < 0)
 377                 goto snd_error;
 378
 379         ret = snd_card_register(card);
 380         if (ret < 0)
 381                 goto snd_error;
 382
 383         solo_g723_config(solo_dev);
 384
 385         dev_info(&solo_dev->pdev->dev, "Alsa sound card as %s\n", name);
 386
 387         return 0;
 388
 389 snd_error:
 390         snd_card_free(card);
 391         return ret;
 392 }
 393
 394 void solo_g723_exit(struct solo_dev *solo_dev)
 395 {
 396         solo_reg_write(solo_dev, SOLO_AUDIO_CONTROL, 0);
 397         solo_irq_off(solo_dev, SOLO_IRQ_G723);
 398
 399         snd_card_free(solo_dev->snd_card);
 400 }