drivers/media/video/tlg2300/pd-alsa.c

   1 #include <linux/kernel.h>
   2 #include <linux/usb.h>
   3 #include <linux/init.h>
   4 #include <linux/sound.h>
   5 #include <linux/spinlock.h>
   6 #include <linux/soundcard.h>
   7 #include <linux/vmalloc.h>
   8 #include <linux/proc_fs.h>
   9 #include <linux/module.h>
  10 #include <linux/gfp.h>
  11 #include <sound/core.h>
  12 #include <sound/pcm.h>
  13 #include <sound/pcm_params.h>
  14 #include <sound/info.h>
  15 #include <sound/initval.h>
  16 #include <sound/control.h>
  17 #include <media/v4l2-common.h>
  18 #include "pd-common.h"
  19 #include "vendorcmds.h"
  20
  21 static void complete_handler_audio(struct urb *urb);
  22 #define AUDIO_EP        (0x83)
  23 #define AUDIO_BUF_SIZE  (512)
  24 #define PERIOD_SIZE     (1024 * 8)
  25 #define PERIOD_MIN      (4)
  26 #define PERIOD_MAX      PERIOD_MIN
  27
  28 static struct snd_pcm_hardware snd_pd_hw_capture = {
  29         .info = SNDRV_PCM_INFO_BLOCK_TRANSFER |
  30                 SNDRV_PCM_INFO_MMAP           |
  31                 SNDRV_PCM_INFO_INTERLEAVED |
  32                 SNDRV_PCM_INFO_MMAP_VALID,
  33
  34         .formats = SNDRV_PCM_FMTBIT_S16_LE,
  35         .rates = SNDRV_PCM_RATE_48000,
  36
  37         .rate_min = 48000,
  38         .rate_max = 48000,
  39         .channels_min = 2,
  40         .channels_max = 2,
  41         .buffer_bytes_max = PERIOD_SIZE * PERIOD_MIN,
  42         .period_bytes_min = PERIOD_SIZE,
  43         .period_bytes_max = PERIOD_SIZE,
  44         .periods_min = PERIOD_MIN,
  45         .periods_max = PERIOD_MAX,
  46         /*
  47         .buffer_bytes_max = 62720 * 8,
  48         .period_bytes_min = 64,
  49         .period_bytes_max = 12544,
  50         .periods_min = 2,
  51         .periods_max = 98
  52         */
  53 };
  54
  55 static int snd_pd_capture_open(struct snd_pcm_substream *substream)
  56 {
  57         struct poseidon *p = snd_pcm_substream_chip(substream);
  58         struct poseidon_audio *pa = &p->audio;
  59         struct snd_pcm_runtime *runtime = substream->runtime;
  60
  61         if (!p)
  62                 return -ENODEV;
  63         pa->users++;
  64         pa->card_close          = 0;
  65         pa->capture_pcm_substream       = substream;
  66         runtime->private_data           = p;
  67
  68         runtime->hw = snd_pd_hw_capture;
  69         snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);
  70         usb_autopm_get_interface(p->interface);
  71         kref_get(&p->kref);
  72         return 0;
  73 }
  74
  75 static int snd_pd_pcm_close(struct snd_pcm_substream *substream)
  76 {
  77         struct poseidon *p = snd_pcm_substream_chip(substream);
  78         struct poseidon_audio *pa = &p->audio;
  79
  80         pa->users--;
  81         pa->card_close          = 1;
  82         usb_autopm_put_interface(p->interface);
  83         kref_put(&p->kref, poseidon_delete);
  84         return 0;
  85 }
  86
  87 static int snd_pd_hw_capture_params(struct snd_pcm_substream *substream,
  88                                         struct snd_pcm_hw_params *hw_params)
  89 {
  90         struct snd_pcm_runtime *runtime = substream->runtime;
  91         unsigned int size;
  92
  93         size = params_buffer_bytes(hw_params);
  94         if (runtime->dma_area) {
  95                 if (runtime->dma_bytes > size)
  96                         return 0;
  97                 vfree(runtime->dma_area);
  98         }
  99         runtime->dma_area = vmalloc(size);
 100         if (!runtime->dma_area)
 101                 return -ENOMEM;
 102         else
 103                 runtime->dma_bytes = size;
 104         return 0;
 105 }
 106
 107 static int audio_buf_free(struct poseidon *p)
 108 {
 109         struct poseidon_audio *pa = &p->audio;
 110         int i;
 111
 112         for (i = 0; i < AUDIO_BUFS; i++)
 113                 if (pa->urb_array[i])
 114                         usb_kill_urb(pa->urb_array[i]);
 115         free_all_urb_generic(pa->urb_array, AUDIO_BUFS);
 116         logpm();
 117         return 0;
 118 }
 119
 120 static int snd_pd_hw_capture_free(struct snd_pcm_substream *substream)
 121 {
 122         struct poseidon *p = snd_pcm_substream_chip(substream);
 123
 124         logpm();
 125         audio_buf_free(p);
 126         return 0;
 127 }
 128
 129 static int snd_pd_prepare(struct snd_pcm_substream *substream)
 130 {
 131         return 0;
 132 }
 133
 134 #define AUDIO_TRAILER_SIZE      (16)
 135 static inline void handle_audio_data(struct urb *urb, int *period_elapsed)
 136 {
 137         struct poseidon_audio *pa = urb->context;
 138         struct snd_pcm_runtime *runtime = pa->capture_pcm_substream->runtime;
 139
 140         int stride      = runtime->frame_bits >> 3;
 141         int len         = urb->actual_length / stride;
 142         unsigned char *cp       = urb->transfer_buffer;
 143         unsigned int oldptr     = pa->rcv_position;
 144
 145         if (urb->actual_length == AUDIO_BUF_SIZE - 4)
 146                 len -= (AUDIO_TRAILER_SIZE / stride);
 147
 148         /* do the copy */
 149         if (oldptr + len >= runtime->buffer_size) {
 150                 unsigned int cnt = runtime->buffer_size - oldptr;
 151
 152                 memcpy(runtime->dma_area + oldptr * stride, cp, cnt * stride);
 153                 memcpy(runtime->dma_area, (cp + cnt * stride),
 154                                         (len * stride - cnt * stride));
 155         } else
 156                 memcpy(runtime->dma_area + oldptr * stride, cp, len * stride);
 157
 158         /* update the statas */
 159         snd_pcm_stream_lock(pa->capture_pcm_substream);
 160         pa->rcv_position        += len;
 161         if (pa->rcv_position >= runtime->buffer_size)
 162                 pa->rcv_position -= runtime->buffer_size;
 163
 164         pa->copied_position += (len);
 165         if (pa->copied_position >= runtime->period_size) {
 166                 pa->copied_position -= runtime->period_size;
 167                 *period_elapsed = 1;
 168         }
 169         snd_pcm_stream_unlock(pa->capture_pcm_substream);
 170 }
 171
 172 static void complete_handler_audio(struct urb *urb)
 173 {
 174         struct poseidon_audio *pa = urb->context;
 175         struct snd_pcm_substream *substream = pa->capture_pcm_substream;
 176         int    period_elapsed = 0;
 177         int    ret;
 178
 179         if (1 == pa->card_close || pa->capture_stream != STREAM_ON)
 180                 return;
 181
 182         if (urb->status != 0) {
 183                 /*if (urb->status == -ESHUTDOWN)*/
 184                         return;
 185         }
 186
 187         if (substream) {
 188                 if (urb->actual_length) {
 189                         handle_audio_data(urb, &period_elapsed);
 190                         if (period_elapsed)
 191                                 snd_pcm_period_elapsed(substream);
 192                 }
 193         }
 194
 195         ret = usb_submit_urb(urb, GFP_ATOMIC);
 196         if (ret < 0)
 197                 log("audio urb failed (errcod = %i)", ret);
 198         return;
 199 }
 200
 201 static int fire_audio_urb(struct poseidon *p)
 202 {
 203         int i, ret = 0;
 204         struct poseidon_audio *pa = &p->audio;
 205
 206         alloc_bulk_urbs_generic(pa->urb_array, AUDIO_BUFS,
 207                         p->udev, AUDIO_EP,
 208                         AUDIO_BUF_SIZE, GFP_ATOMIC,
 209                         complete_handler_audio, pa);
 210
 211         for (i = 0; i < AUDIO_BUFS; i++) {
 212                 ret = usb_submit_urb(pa->urb_array[i], GFP_KERNEL);
 213                 if (ret)
 214                         log("urb err : %d", ret);
 215         }
 216         log();
 217         return ret;
 218 }
 219
 220 static int snd_pd_capture_trigger(struct snd_pcm_substream *substream, int cmd)
 221 {
 222         struct poseidon *p = snd_pcm_substream_chip(substream);
 223         struct poseidon_audio *pa = &p->audio;
 224
 225         if (debug_mode)
 226                 log("cmd %d, audio stat : %d\n", cmd, pa->capture_stream);
 227
 228         switch (cmd) {
 229         case SNDRV_PCM_TRIGGER_RESUME:
 230         case SNDRV_PCM_TRIGGER_START:
 231                 if (pa->capture_stream == STREAM_ON)
 232                         return 0;
 233
 234                 pa->rcv_position = pa->copied_position = 0;
 235                 pa->capture_stream = STREAM_ON;
 236
 237                 if (in_hibernation(p))
 238                         return 0;
 239                 fire_audio_urb(p);
 240                 return 0;
 241
 242         case SNDRV_PCM_TRIGGER_SUSPEND:
 243                 pa->capture_stream = STREAM_SUSPEND;
 244                 return 0;
 245         case SNDRV_PCM_TRIGGER_STOP:
 246                 pa->capture_stream = STREAM_OFF;
 247                 return 0;
 248         default:
 249                 return -EINVAL;
 250         }
 251 }
 252
 253 static snd_pcm_uframes_t
 254 snd_pd_capture_pointer(struct snd_pcm_substream *substream)
 255 {
 256         struct poseidon *p = snd_pcm_substream_chip(substream);
 257         struct poseidon_audio *pa = &p->audio;
 258         return pa->rcv_position;
 259 }
 260
 261 static struct page *snd_pcm_pd_get_page(struct snd_pcm_substream *subs,
 262                                              unsigned long offset)
 263 {
 264         void *pageptr = subs->runtime->dma_area + offset;
 265         return vmalloc_to_page(pageptr);
 266 }
 267
 268 static struct snd_pcm_ops pcm_capture_ops = {
 269         .open      = snd_pd_capture_open,
 270         .close     = snd_pd_pcm_close,
 271         .ioctl     = snd_pcm_lib_ioctl,
 272         .hw_params = snd_pd_hw_capture_params,
 273         .hw_free   = snd_pd_hw_capture_free,
 274         .prepare   = snd_pd_prepare,
 275         .trigger   = snd_pd_capture_trigger,
 276         .pointer   = snd_pd_capture_pointer,
 277         .page      = snd_pcm_pd_get_page,
 278 };
 279
 280 #ifdef CONFIG_PM
 281 int pm_alsa_suspend(struct poseidon *p)
 282 {
 283         logpm(p);
 284         audio_buf_free(p);
 285         return 0;
 286 }
 287
 288 int pm_alsa_resume(struct poseidon *p)
 289 {
 290         logpm(p);
 291         fire_audio_urb(p);
 292         return 0;
 293 }
 294 #endif
 295
 296 int poseidon_audio_init(struct poseidon *p)
 297 {
 298         struct poseidon_audio *pa = &p->audio;
 299         struct snd_card *card;
 300         struct snd_pcm *pcm;
 301         int ret;
 302
 303         ret = snd_card_create(-1, "Telegent", THIS_MODULE, 0, &card);
 304         if (ret != 0)
 305                 return ret;
 306
 307         ret = snd_pcm_new(card, "poseidon audio", 0, 0, 1, &pcm);
 308         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &pcm_capture_ops);
 309         pcm->info_flags   = 0;
 310         pcm->private_data = p;
 311         strcpy(pcm->name, "poseidon audio capture");
 312
 313         strcpy(card->driver, "ALSA driver");
 314         strcpy(card->shortname, "poseidon Audio");
 315         strcpy(card->longname, "poseidon ALSA Audio");
 316
 317         if (snd_card_register(card)) {
 318                 snd_card_free(card);
 319                 return -ENOMEM;
 320         }
 321         pa->card = card;
 322         return 0;
 323 }
 324
 325 int poseidon_audio_free(struct poseidon *p)
 326 {
 327         struct poseidon_audio *pa = &p->audio;
 328
 329         if (pa->card)
 330                 snd_card_free(pa->card);
 331         return 0;
 332 }