drivers/media/pci/solo6x10/solo6x10-g723.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Copyright (C) 2010-2013 Bluecherry, LLC <https://www.bluecherrydvr.com>
   4  *
   5  * Original author:
   6  * Ben Collins <bcollins@ubuntu.com>
   7  *
   8  * Additional work by:
   9  * John Brooks <john.brooks@bluecherry.net>
  10  */
  11
  12 #include <linux/kernel.h>
  13 #include <linux/mempool.h>
  14 #include <linux/poll.h>
  15 #include <linux/kthread.h>
  16 #include <linux/freezer.h>
  17 #include <linux/module.h>
  18 #include <linux/slab.h>
  19
  20 #include <sound/core.h>
  21 #include <sound/initval.h>
  22 #include <sound/pcm.h>
  23 #include <sound/control.h>
  24
  25 #include "solo6x10.h"
  26 #include "solo6x10-tw28.h"
  27
  28 #define G723_FDMA_PAGES         32
  29 #define G723_PERIOD_BYTES       48
  30 #define G723_PERIOD_BLOCK       1024
  31 #define G723_FRAMES_PER_PAGE    48
  32
  33 /* Sets up channels 16-19 for decoding and 0-15 for encoding */
  34 #define OUTMODE_MASK            0x300
  35
  36 #define SAMPLERATE              8000
  37 #define BITRATE                 25
  38
  39 /* The solo writes to 1k byte pages, 32 pages, in the dma. Each 1k page
  40  * is broken down to 20 * 48 byte regions (one for each channel possible)
  41  * with the rest of the page being dummy data. */
  42 #define PERIODS                 G723_FDMA_PAGES
  43 #define G723_INTR_ORDER         4 /* 0 - 4 */
  44
  45 struct solo_snd_pcm {
  46         int                             on;
  47         spinlock_t                      lock;
  48         struct solo_dev                 *solo_dev;
  49         u8                              *g723_buf;
  50         dma_addr_t                      g723_dma;
  51 };
  52
  53 static void solo_g723_config(struct solo_dev *solo_dev)
  54 {
  55         int clk_div;
  56
  57         clk_div = (solo_dev->clock_mhz * 1000000)
  58                 / (SAMPLERATE * (BITRATE * 2) * 2);
  59
  60         solo_reg_write(solo_dev, SOLO_AUDIO_SAMPLE,
  61                        SOLO_AUDIO_BITRATE(BITRATE)
  62                        | SOLO_AUDIO_CLK_DIV(clk_div));
  63
  64         solo_reg_write(solo_dev, SOLO_AUDIO_FDMA_INTR,
  65                        SOLO_AUDIO_FDMA_INTERVAL(1)
  66                        | SOLO_AUDIO_INTR_ORDER(G723_INTR_ORDER)
  67                        | SOLO_AUDIO_FDMA_BASE(SOLO_G723_EXT_ADDR(solo_dev) >> 16));
  68
  69         solo_reg_write(solo_dev, SOLO_AUDIO_CONTROL,
  70                        SOLO_AUDIO_ENABLE
  71                        | SOLO_AUDIO_I2S_MODE
  72                        | SOLO_AUDIO_I2S_MULTI(3)
  73                        | SOLO_AUDIO_MODE(OUTMODE_MASK));
  74 }
  75
  76 void solo_g723_isr(struct solo_dev *solo_dev)
  77 {
  78         struct snd_pcm_str *pstr =
  79                 &solo_dev->snd_pcm->streams[SNDRV_PCM_STREAM_CAPTURE];
  80         struct snd_pcm_substream *ss;
  81         struct solo_snd_pcm *solo_pcm;
  82
  83         for (ss = pstr->substream; ss != NULL; ss = ss->next) {
  84                 if (snd_pcm_substream_chip(ss) == NULL)
  85                         continue;
  86
  87                 /* This means open() hasn't been called on this one */
  88                 if (snd_pcm_substream_chip(ss) == solo_dev)
  89                         continue;
  90
  91                 /* Haven't triggered a start yet */
  92                 solo_pcm = snd_pcm_substream_chip(ss);
  93                 if (!solo_pcm->on)
  94                         continue;
  95
  96                 snd_pcm_period_elapsed(ss);
  97         }
  98 }
  99
 100 static const struct snd_pcm_hardware snd_solo_pcm_hw = {
 101         .info                   = (SNDRV_PCM_INFO_MMAP |
 102                                    SNDRV_PCM_INFO_INTERLEAVED |
 103                                    SNDRV_PCM_INFO_BLOCK_TRANSFER |
 104                                    SNDRV_PCM_INFO_MMAP_VALID),
 105         .formats                = SNDRV_PCM_FMTBIT_U8,
 106         .rates                  = SNDRV_PCM_RATE_8000,
 107         .rate_min               = SAMPLERATE,
 108         .rate_max               = SAMPLERATE,
 109         .channels_min           = 1,
 110         .channels_max           = 1,
 111         .buffer_bytes_max       = G723_PERIOD_BYTES * PERIODS,
 112         .period_bytes_min       = G723_PERIOD_BYTES,
 113         .period_bytes_max       = G723_PERIOD_BYTES,
 114         .periods_min            = PERIODS,
 115         .periods_max            = PERIODS,
 116 };
 117
 118 static int snd_solo_pcm_open(struct snd_pcm_substream *ss)
 119 {
 120         struct solo_dev *solo_dev = snd_pcm_substream_chip(ss);
 121         struct solo_snd_pcm *solo_pcm;
 122
 123         solo_pcm = kzalloc(sizeof(*solo_pcm), GFP_KERNEL);
 124         if (solo_pcm == NULL)
 125                 goto oom;
 126
 127         solo_pcm->g723_buf = dma_alloc_coherent(&solo_dev->pdev->dev,
 128                                                 G723_PERIOD_BYTES,
 129                                                 &solo_pcm->g723_dma,
 130                                                 GFP_KERNEL);
 131         if (solo_pcm->g723_buf == NULL)
 132                 goto oom;
 133
 134         spin_lock_init(&solo_pcm->lock);
 135         solo_pcm->solo_dev = solo_dev;
 136         ss->runtime->hw = snd_solo_pcm_hw;
 137
 138         snd_pcm_substream_chip(ss) = solo_pcm;
 139
 140         return 0;
 141
 142 oom:
 143         kfree(solo_pcm);
 144         return -ENOMEM;
 145 }
 146
 147 static int snd_solo_pcm_close(struct snd_pcm_substream *ss)
 148 {
 149         struct solo_snd_pcm *solo_pcm = snd_pcm_substream_chip(ss);
 150
 151         snd_pcm_substream_chip(ss) = solo_pcm->solo_dev;
 152         dma_free_coherent(&solo_pcm->solo_dev->pdev->dev, G723_PERIOD_BYTES,
 153                           solo_pcm->g723_buf, solo_pcm->g723_dma);
 154         kfree(solo_pcm);
 155
 156         return 0;
 157 }
 158
 159 static int snd_solo_pcm_trigger(struct snd_pcm_substream *ss, int cmd)
 160 {
 161         struct solo_snd_pcm *solo_pcm = snd_pcm_substream_chip(ss);
 162         struct solo_dev *solo_dev = solo_pcm->solo_dev;
 163         int ret = 0;
 164
 165         spin_lock(&solo_pcm->lock);
 166
 167         switch (cmd) {
 168         case SNDRV_PCM_TRIGGER_START:
 169                 if (solo_pcm->on == 0) {
 170                         /* If this is the first user, switch on interrupts */
 171                         if (atomic_inc_return(&solo_dev->snd_users) == 1)
 172                                 solo_irq_on(solo_dev, SOLO_IRQ_G723);
 173                         solo_pcm->on = 1;
 174                 }
 175                 break;
 176         case SNDRV_PCM_TRIGGER_STOP:
 177                 if (solo_pcm->on) {
 178                         /* If this was our last user, switch them off */
 179                         if (atomic_dec_return(&solo_dev->snd_users) == 0)
 180                                 solo_irq_off(solo_dev, SOLO_IRQ_G723);
 181                         solo_pcm->on = 0;
 182                 }
 183                 break;
 184         default:
 185                 ret = -EINVAL;
 186         }
 187
 188         spin_unlock(&solo_pcm->lock);
 189
 190         return ret;
 191 }
 192
 193 static int snd_solo_pcm_prepare(struct snd_pcm_substream *ss)
 194 {
 195         return 0;
 196 }
 197
 198 static snd_pcm_uframes_t snd_solo_pcm_pointer(struct snd_pcm_substream *ss)
 199 {
 200         struct solo_snd_pcm *solo_pcm = snd_pcm_substream_chip(ss);
 201         struct solo_dev *solo_dev = solo_pcm->solo_dev;
 202         snd_pcm_uframes_t idx = solo_reg_read(solo_dev, SOLO_AUDIO_STA) & 0x1f;
 203
 204         return idx * G723_FRAMES_PER_PAGE;
 205 }
 206
 207 static int snd_solo_pcm_copy_user(struct snd_pcm_substream *ss, int channel,
 208                                   unsigned long pos, void __user *dst,
 209                                   unsigned long count)
 210 {
 211         struct solo_snd_pcm *solo_pcm = snd_pcm_substream_chip(ss);
 212         struct solo_dev *solo_dev = solo_pcm->solo_dev;
 213         int err, i;
 214
 215         for (i = 0; i < (count / G723_FRAMES_PER_PAGE); i++) {
 216                 int page = (pos / G723_FRAMES_PER_PAGE) + i;
 217
 218                 err = solo_p2m_dma_t(solo_dev, 0, solo_pcm->g723_dma,
 219                                      SOLO_G723_EXT_ADDR(solo_dev) +
 220                                      (page * G723_PERIOD_BLOCK) +
 221                                      (ss->number * G723_PERIOD_BYTES),
 222                                      G723_PERIOD_BYTES, 0, 0);
 223                 if (err)
 224                         return err;
 225
 226                 if (copy_to_user(dst, solo_pcm->g723_buf, G723_PERIOD_BYTES))
 227                         return -EFAULT;
 228                 dst += G723_PERIOD_BYTES;
 229         }
 230
 231         return 0;
 232 }
 233
 234 static int snd_solo_pcm_copy_kernel(struct snd_pcm_substream *ss, int channel,
 235                                     unsigned long pos, void *dst,
 236                                     unsigned long count)
 237 {
 238         struct solo_snd_pcm *solo_pcm = snd_pcm_substream_chip(ss);
 239         struct solo_dev *solo_dev = solo_pcm->solo_dev;
 240         int err, i;
 241
 242         for (i = 0; i < (count / G723_FRAMES_PER_PAGE); i++) {
 243                 int page = (pos / G723_FRAMES_PER_PAGE) + i;
 244
 245                 err = solo_p2m_dma_t(solo_dev, 0, solo_pcm->g723_dma,
 246                                      SOLO_G723_EXT_ADDR(solo_dev) +
 247                                      (page * G723_PERIOD_BLOCK) +
 248                                      (ss->number * G723_PERIOD_BYTES),
 249                                      G723_PERIOD_BYTES, 0, 0);
 250                 if (err)
 251                         return err;
 252
 253                 memcpy(dst, solo_pcm->g723_buf, G723_PERIOD_BYTES);
 254                 dst += G723_PERIOD_BYTES;
 255         }
 256
 257         return 0;
 258 }
 259
 260 static const struct snd_pcm_ops snd_solo_pcm_ops = {
 261         .open = snd_solo_pcm_open,
 262         .close = snd_solo_pcm_close,
 263         .prepare = snd_solo_pcm_prepare,
 264         .trigger = snd_solo_pcm_trigger,
 265         .pointer = snd_solo_pcm_pointer,
 266         .copy_user = snd_solo_pcm_copy_user,
 267         .copy_kernel = snd_solo_pcm_copy_kernel,
 268 };
 269
 270 static int snd_solo_capture_volume_info(struct snd_kcontrol *kcontrol,
 271                                         struct snd_ctl_elem_info *info)
 272 {
 273         info->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
 274         info->count = 1;
 275         info->value.integer.min = 0;
 276         info->value.integer.max = 15;
 277         info->value.integer.step = 1;
 278
 279         return 0;
 280 }
 281
 282 static int snd_solo_capture_volume_get(struct snd_kcontrol *kcontrol,
 283                                        struct snd_ctl_elem_value *value)
 284 {
 285         struct solo_dev *solo_dev = snd_kcontrol_chip(kcontrol);
 286         u8 ch = value->id.numid - 1;
 287
 288         value->value.integer.value[0] = tw28_get_audio_gain(solo_dev, ch);
 289
 290         return 0;
 291 }
 292
 293 static int snd_solo_capture_volume_put(struct snd_kcontrol *kcontrol,
 294                                        struct snd_ctl_elem_value *value)
 295 {
 296         struct solo_dev *solo_dev = snd_kcontrol_chip(kcontrol);
 297         u8 ch = value->id.numid - 1;
 298         u8 old_val;
 299
 300         old_val = tw28_get_audio_gain(solo_dev, ch);
 301         if (old_val == value->value.integer.value[0])
 302                 return 0;
 303
 304         tw28_set_audio_gain(solo_dev, ch, value->value.integer.value[0]);
 305
 306         return 1;
 307 }
 308
 309 static const struct snd_kcontrol_new snd_solo_capture_volume = {
 310         .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
 311         .name = "Capture Volume",
 312         .info = snd_solo_capture_volume_info,
 313         .get = snd_solo_capture_volume_get,
 314         .put = snd_solo_capture_volume_put,
 315 };
 316
 317 static int solo_snd_pcm_init(struct solo_dev *solo_dev)
 318 {
 319         struct snd_card *card = solo_dev->snd_card;
 320         struct snd_pcm *pcm;
 321         struct snd_pcm_substream *ss;
 322         int ret;
 323         int i;
 324
 325         ret = snd_pcm_new(card, card->driver, 0, 0, solo_dev->nr_chans,
 326                           &pcm);
 327         if (ret < 0)
 328                 return ret;
 329
 330         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE,
 331                         &snd_solo_pcm_ops);
 332
 333         snd_pcm_chip(pcm) = solo_dev;
 334         pcm->info_flags = 0;
 335         strscpy(pcm->name, card->shortname, sizeof(pcm->name));
 336
 337         for (i = 0, ss = pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream;
 338              ss; ss = ss->next, i++)
 339                 sprintf(ss->name, "Camera #%d Audio", i);
 340
 341         snd_pcm_set_managed_buffer_all(pcm,
 342                                        SNDRV_DMA_TYPE_CONTINUOUS,
 343                                        NULL,
 344                                        G723_PERIOD_BYTES * PERIODS,
 345                                        G723_PERIOD_BYTES * PERIODS);
 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 = { };
 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         strscpy(card->driver, SOLO6X10_NAME, sizeof(card->driver));
 374         strscpy(card->shortname, "SOLO-6x10 Audio", sizeof(card->shortname));
 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         strscpy(card->mixername, "SOLO-6x10", sizeof(card->mixername));
 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                 goto snd_error;
 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 }