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