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

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Copyright (C) 2010-2013 Bluecherry, LLC <http://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 = pci_alloc_consistent(solo_dev->pdev,
 128                                                   G723_PERIOD_BYTES,
 129                                                   &solo_pcm->g723_dma);
 130         if (solo_pcm->g723_buf == NULL)
 131                 goto oom;
 132
 133         spin_lock_init(&solo_pcm->lock);
 134         solo_pcm->solo_dev = solo_dev;
 135         ss->runtime->hw = snd_solo_pcm_hw;
 136
 137         snd_pcm_substream_chip(ss) = solo_pcm;
 138
 139         return 0;
 140
 141 oom:
 142         kfree(solo_pcm);
 143         return -ENOMEM;
 144 }
 145
 146 static int snd_solo_pcm_close(struct snd_pcm_substream *ss)
 147 {
 148         struct solo_snd_pcm *solo_pcm = snd_pcm_substream_chip(ss);
 149
 150         snd_pcm_substream_chip(ss) = solo_pcm->solo_dev;
 151         pci_free_consistent(solo_pcm->solo_dev->pdev, G723_PERIOD_BYTES,
 152                             solo_pcm->g723_buf, solo_pcm->g723_dma);
 153         kfree(solo_pcm);
 154
 155         return 0;
 156 }
 157
 158 static int snd_solo_pcm_trigger(struct snd_pcm_substream *ss, int cmd)
 159 {
 160         struct solo_snd_pcm *solo_pcm = snd_pcm_substream_chip(ss);
 161         struct solo_dev *solo_dev = solo_pcm->solo_dev;
 162         int ret = 0;
 163
 164         spin_lock(&solo_pcm->lock);
 165
 166         switch (cmd) {
 167         case SNDRV_PCM_TRIGGER_START:
 168                 if (solo_pcm->on == 0) {
 169                         /* If this is the first user, switch on interrupts */
 170                         if (atomic_inc_return(&solo_dev->snd_users) == 1)
 171                                 solo_irq_on(solo_dev, SOLO_IRQ_G723);
 172                         solo_pcm->on = 1;
 173                 }
 174                 break;
 175         case SNDRV_PCM_TRIGGER_STOP:
 176                 if (solo_pcm->on) {
 177                         /* If this was our last user, switch them off */
 178                         if (atomic_dec_return(&solo_dev->snd_users) == 0)
 179                                 solo_irq_off(solo_dev, SOLO_IRQ_G723);
 180                         solo_pcm->on = 0;
 181                 }
 182                 break;
 183         default:
 184                 ret = -EINVAL;
 185         }
 186
 187         spin_unlock(&solo_pcm->lock);
 188
 189         return ret;
 190 }
 191
 192 static int snd_solo_pcm_prepare(struct snd_pcm_substream *ss)
 193 {
 194         return 0;
 195 }
 196
 197 static snd_pcm_uframes_t snd_solo_pcm_pointer(struct snd_pcm_substream *ss)
 198 {
 199         struct solo_snd_pcm *solo_pcm = snd_pcm_substream_chip(ss);
 200         struct solo_dev *solo_dev = solo_pcm->solo_dev;
 201         snd_pcm_uframes_t idx = solo_reg_read(solo_dev, SOLO_AUDIO_STA) & 0x1f;
 202
 203         return idx * G723_FRAMES_PER_PAGE;
 204 }
 205
 206 static int snd_solo_pcm_copy_user(struct snd_pcm_substream *ss, int channel,
 207                                   unsigned long pos, void __user *dst,
 208                                   unsigned long count)
 209 {
 210         struct solo_snd_pcm *solo_pcm = snd_pcm_substream_chip(ss);
 211         struct solo_dev *solo_dev = solo_pcm->solo_dev;
 212         int err, i;
 213
 214         for (i = 0; i < (count / G723_FRAMES_PER_PAGE); i++) {
 215                 int page = (pos / G723_FRAMES_PER_PAGE) + i;
 216
 217                 err = solo_p2m_dma_t(solo_dev, 0, solo_pcm->g723_dma,
 218                                      SOLO_G723_EXT_ADDR(solo_dev) +
 219                                      (page * G723_PERIOD_BLOCK) +
 220                                      (ss->number * G723_PERIOD_BYTES),
 221                                      G723_PERIOD_BYTES, 0, 0);
 222                 if (err)
 223                         return err;
 224
 225                 if (copy_to_user(dst, solo_pcm->g723_buf, G723_PERIOD_BYTES))
 226                         return -EFAULT;
 227                 dst += G723_PERIOD_BYTES;
 228         }
 229
 230         return 0;
 231 }
 232
 233 static int snd_solo_pcm_copy_kernel(struct snd_pcm_substream *ss, int channel,
 234                                     unsigned long pos, void *dst,
 235                                     unsigned long count)
 236 {
 237         struct solo_snd_pcm *solo_pcm = snd_pcm_substream_chip(ss);
 238         struct solo_dev *solo_dev = solo_pcm->solo_dev;
 239         int err, i;
 240
 241         for (i = 0; i < (count / G723_FRAMES_PER_PAGE); i++) {
 242                 int page = (pos / G723_FRAMES_PER_PAGE) + i;
 243
 244                 err = solo_p2m_dma_t(solo_dev, 0, solo_pcm->g723_dma,
 245                                      SOLO_G723_EXT_ADDR(solo_dev) +
 246                                      (page * G723_PERIOD_BLOCK) +
 247                                      (ss->number * G723_PERIOD_BYTES),
 248                                      G723_PERIOD_BYTES, 0, 0);
 249                 if (err)
 250                         return err;
 251
 252                 memcpy(dst, solo_pcm->g723_buf, G723_PERIOD_BYTES);
 253                 dst += G723_PERIOD_BYTES;
 254         }
 255
 256         return 0;
 257 }
 258
 259 static const struct snd_pcm_ops snd_solo_pcm_ops = {
 260         .open = snd_solo_pcm_open,
 261         .close = snd_solo_pcm_close,
 262         .prepare = snd_solo_pcm_prepare,
 263         .trigger = snd_solo_pcm_trigger,
 264         .pointer = snd_solo_pcm_pointer,
 265         .copy_user = snd_solo_pcm_copy_user,
 266         .copy_kernel = snd_solo_pcm_copy_kernel,
 267 };
 268
 269 static int snd_solo_capture_volume_info(struct snd_kcontrol *kcontrol,
 270                                         struct snd_ctl_elem_info *info)
 271 {
 272         info->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
 273         info->count = 1;
 274         info->value.integer.min = 0;
 275         info->value.integer.max = 15;
 276         info->value.integer.step = 1;
 277
 278         return 0;
 279 }
 280
 281 static int snd_solo_capture_volume_get(struct snd_kcontrol *kcontrol,
 282                                        struct snd_ctl_elem_value *value)
 283 {
 284         struct solo_dev *solo_dev = snd_kcontrol_chip(kcontrol);
 285         u8 ch = value->id.numid - 1;
 286
 287         value->value.integer.value[0] = tw28_get_audio_gain(solo_dev, ch);
 288
 289         return 0;
 290 }
 291
 292 static int snd_solo_capture_volume_put(struct snd_kcontrol *kcontrol,
 293                                        struct snd_ctl_elem_value *value)
 294 {
 295         struct solo_dev *solo_dev = snd_kcontrol_chip(kcontrol);
 296         u8 ch = value->id.numid - 1;
 297         u8 old_val;
 298
 299         old_val = tw28_get_audio_gain(solo_dev, ch);
 300         if (old_val == value->value.integer.value[0])
 301                 return 0;
 302
 303         tw28_set_audio_gain(solo_dev, ch, value->value.integer.value[0]);
 304
 305         return 1;
 306 }
 307
 308 static const struct snd_kcontrol_new snd_solo_capture_volume = {
 309         .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
 310         .name = "Capture Volume",
 311         .info = snd_solo_capture_volume_info,
 312         .get = snd_solo_capture_volume_get,
 313         .put = snd_solo_capture_volume_put,
 314 };
 315
 316 static int solo_snd_pcm_init(struct solo_dev *solo_dev)
 317 {
 318         struct snd_card *card = solo_dev->snd_card;
 319         struct snd_pcm *pcm;
 320         struct snd_pcm_substream *ss;
 321         int ret;
 322         int i;
 323
 324         ret = snd_pcm_new(card, card->driver, 0, 0, solo_dev->nr_chans,
 325                           &pcm);
 326         if (ret < 0)
 327                 return ret;
 328
 329         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE,
 330                         &snd_solo_pcm_ops);
 331
 332         snd_pcm_chip(pcm) = solo_dev;
 333         pcm->info_flags = 0;
 334         strscpy(pcm->name, card->shortname, sizeof(pcm->name));
 335
 336         for (i = 0, ss = pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream;
 337              ss; ss = ss->next, i++)
 338                 sprintf(ss->name, "Camera #%d Audio", i);
 339
 340         snd_pcm_set_managed_buffer_all(pcm,
 341                                        SNDRV_DMA_TYPE_CONTINUOUS,
 342                                        NULL,
 343                                        G723_PERIOD_BYTES * PERIODS,
 344                                        G723_PERIOD_BYTES * PERIODS);
 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         strscpy(card->driver, SOLO6X10_NAME, sizeof(card->driver));
 373         strscpy(card->shortname, "SOLO-6x10 Audio", sizeof(card->shortname));
 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         strscpy(card->mixername, "SOLO-6x10", sizeof(card->mixername));
 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 }