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