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   1 /*
   2  **********************************************************************
   3  *     passthrough.c -- Emu10k1 digital passthrough
   4  *     Copyright (C) 2001  Juha Yrjölä <jyrjola@cc.hut.fi>
   5  *
   6  **********************************************************************
   7  *
   8  *     Date                 Author          Summary of changes
   9  *     ----                 ------          ------------------
  10  *     May 15, 2001         Juha Yrjölä     base code release
  11  *
  12  **********************************************************************
  13  *
  14  *     This program is free software; you can redistribute it and/or
  15  *     modify it under the terms of the GNU General Public License as
  16  *     published by the Free Software Foundation; either version 2 of
  17  *     the License, or (at your option) any later version.
  18  *
  19  *     This program is distributed in the hope that it will be useful,
  20  *     but WITHOUT ANY WARRANTY; without even the implied warranty of
  21  *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  22  *     GNU General Public License for more details.
  23  *
  24  *     You should have received a copy of the GNU General Public
  25  *     License along with this program; if not, write to the Free
  26  *     Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139,
  27  *     USA.
  28  *
  29  **********************************************************************
  30  */
  31
  32 #include <linux/module.h>
  33 #include <linux/poll.h>
  34 #include <linux/slab.h>
  35 #include <linux/bitops.h>
  36 #include <asm/io.h>
  37 #include <linux/sched.h>
  38 #include <linux/smp_lock.h>
  39
  40 #include "hwaccess.h"
  41 #include "cardwo.h"
  42 #include "cardwi.h"
  43 #include "recmgr.h"
  44 #include "irqmgr.h"
  45 #include "audio.h"
  46 #include "8010.h"
  47
  48 static void pt_putsamples(struct pt_data *pt, u16 *ptr, u16 left, u16 right)
  49 {
  50         unsigned int idx;
  51
  52         ptr[pt->copyptr] = left;
  53         idx = pt->copyptr + PT_SAMPLES/2;
  54         idx %= PT_SAMPLES;
  55         ptr[idx] = right;
  56 }
  57
  58 static inline int pt_can_write(struct pt_data *pt)
  59 {
  60         return pt->blocks_copied < pt->blocks_played + 8;
  61 }
  62
  63 static int pt_wait_for_write(struct emu10k1_wavedevice *wavedev, int nonblock)
  64 {
  65         struct emu10k1_card *card = wavedev->card;
  66         struct pt_data *pt = &card->pt;
  67
  68         if (nonblock && !pt_can_write(pt))
  69                 return -EAGAIN;
  70         while (!pt_can_write(pt) && pt->state != PT_STATE_INACTIVE) {
  71                 interruptible_sleep_on(&pt->wait);
  72                 if (signal_pending(current))
  73                         return -ERESTARTSYS;
  74         }
  75         if (pt->state == PT_STATE_INACTIVE)
  76                 return -EAGAIN;
  77
  78         return 0;
  79 }
  80
  81 static int pt_putblock(struct emu10k1_wavedevice *wave_dev, u16 *block, int nonblock)
  82 {
  83         struct woinst *woinst = wave_dev->woinst;
  84         struct emu10k1_card *card = wave_dev->card;
  85         struct pt_data *pt = &card->pt;
  86         u16 *ptr = (u16 *) card->tankmem.addr;
  87         int i = 0, r;
  88         unsigned long flags;
  89
  90         r = pt_wait_for_write(wave_dev, nonblock);
  91         if (r < 0)
  92                 return r;
  93         spin_lock_irqsave(&card->pt.lock, flags);
  94         while (i < PT_BLOCKSAMPLES) {
  95                 pt_putsamples(pt, ptr, block[2*i], block[2*i+1]);
  96                 if (pt->copyptr == 0)
  97                         pt->copyptr = PT_SAMPLES;
  98                 pt->copyptr--;
  99                 i++;
 100         }
 101         woinst->total_copied += PT_BLOCKSIZE;
 102         pt->blocks_copied++;
 103         if (pt->blocks_copied >= 4 && pt->state != PT_STATE_PLAYING) {
 104                 DPF(2, "activating digital pass-through playback\n");
 105                 sblive_writeptr(card, GPR_BASE + pt->enable_gpr, 0, 1);
 106                 pt->state = PT_STATE_PLAYING;
 107         }
 108         spin_unlock_irqrestore(&card->pt.lock, flags);
 109         return 0;
 110 }
 111
 112 int emu10k1_pt_setup(struct emu10k1_wavedevice *wave_dev)
 113 {
 114         u32 bits;
 115         struct emu10k1_card *card = wave_dev->card;
 116         struct pt_data *pt = &card->pt;
 117         int i;
 118
 119         for (i = 0; i < 3; i++) {
 120                 pt->old_spcs[i] = sblive_readptr(card, SPCS0 + i, 0);
 121                 if (pt->spcs_to_use & (1 << i)) {
 122                         DPD(2, "using S/PDIF port %d\n", i);
 123                         bits = SPCS_CLKACCY_1000PPM | SPCS_SAMPLERATE_48 |
 124                                 SPCS_CHANNELNUM_LEFT | SPCS_SOURCENUM_UNSPEC | SPCS_GENERATIONSTATUS |
 125                                 0x00001200 | SPCS_EMPHASIS_NONE | SPCS_COPYRIGHT;
 126                         if (pt->ac3data)
 127                                 bits |= SPCS_NOTAUDIODATA;
 128                         sblive_writeptr(card, SPCS0 + i, 0, bits);
 129                 }
 130         }
 131         return 0;
 132 }
 133
 134 ssize_t emu10k1_pt_write(struct file *file, const char __user *buffer, size_t count)
 135 {
 136         struct emu10k1_wavedevice *wave_dev = (struct emu10k1_wavedevice *) file->private_data;
 137         struct emu10k1_card *card = wave_dev->card;
 138         struct pt_data *pt = &card->pt;
 139         int nonblock, i, r, blocks, blocks_copied, bytes_copied = 0;
 140
 141         DPD(3, "emu10k1_pt_write(): %d bytes\n", count);
 142
 143         nonblock = file->f_flags & O_NONBLOCK;
 144
 145         if (card->tankmem.size < PT_SAMPLES*2)
 146                 return -EFAULT;
 147         if (pt->state == PT_STATE_INACTIVE) {
 148                 DPF(2, "bufptr init\n");
 149                 pt->playptr = PT_SAMPLES-1;
 150                 pt->copyptr = PT_INITPTR;
 151                 pt->blocks_played = pt->blocks_copied = 0;
 152                 memset(card->tankmem.addr, 0, card->tankmem.size);
 153                 pt->state = PT_STATE_ACTIVATED;
 154                 pt->buf = kmalloc(PT_BLOCKSIZE, GFP_KERNEL);
 155                 pt->prepend_size = 0;
 156                 if (pt->buf == NULL)
 157                         return -ENOMEM;
 158                 emu10k1_pt_setup(wave_dev);
 159         }
 160         if (pt->prepend_size) {
 161                 int needed = PT_BLOCKSIZE - pt->prepend_size;
 162
 163                 DPD(3, "prepend size %d, prepending %d bytes\n", pt->prepend_size, needed);
 164                 if (count < needed) {
 165                         copy_from_user(pt->buf + pt->prepend_size, buffer, count);
 166                         pt->prepend_size += count;
 167                         DPD(3, "prepend size now %d\n", pt->prepend_size);
 168                         return count;
 169                 }
 170                 copy_from_user(pt->buf + pt->prepend_size, buffer, needed);
 171                 r = pt_putblock(wave_dev, (u16 *) pt->buf, nonblock);
 172                 if (r)
 173                         return r;
 174                 bytes_copied += needed;
 175                 pt->prepend_size = 0;
 176         }
 177         blocks = (count-bytes_copied)/PT_BLOCKSIZE;
 178         blocks_copied = 0;
 179         while (blocks > 0) {
 180                 u16 __user *bufptr = (u16 __user *) buffer + (bytes_copied/2);
 181                 copy_from_user(pt->buf, bufptr, PT_BLOCKSIZE);
 182                 r = pt_putblock(wave_dev, (u16 *)pt->buf, nonblock);
 183                 if (r) {
 184                         if (bytes_copied)
 185                                 return bytes_copied;
 186                         else
 187                                 return r;
 188                 }
 189                 bytes_copied += PT_BLOCKSIZE;
 190                 blocks--;
 191                 blocks_copied++;
 192         }
 193         i = count - bytes_copied;
 194         if (i) {
 195                 pt->prepend_size = i;
 196                 copy_from_user(pt->buf, buffer + bytes_copied, i);
 197                 bytes_copied += i;
 198                 DPD(3, "filling prepend buffer with %d bytes", i);
 199         }
 200         return bytes_copied;
 201 }
 202
 203 void emu10k1_pt_stop(struct emu10k1_card *card)
 204 {
 205         struct pt_data *pt = &card->pt;
 206         int i;
 207
 208         if (pt->state != PT_STATE_INACTIVE) {
 209                 DPF(2, "digital pass-through stopped\n");
 210                 sblive_writeptr(card, (card->is_audigy ? A_GPR_BASE : GPR_BASE) + pt->enable_gpr, 0, 0);
 211                 for (i = 0; i < 3; i++) {
 212                         if (pt->spcs_to_use & (1 << i))
 213                                 sblive_writeptr(card, SPCS0 + i, 0, pt->old_spcs[i]);
 214                 }
 215                 pt->state = PT_STATE_INACTIVE;
 216                 if(pt->buf)
 217                         kfree(pt->buf);
 218         }
 219 }
 220
 221 void emu10k1_pt_waveout_update(struct emu10k1_wavedevice *wave_dev)
 222 {
 223         struct woinst *woinst = wave_dev->woinst;
 224         struct pt_data *pt = &wave_dev->card->pt;
 225         u32 pos;
 226
 227         if (pt->state == PT_STATE_PLAYING && pt->pos_gpr >= 0) {
 228                 pos = sblive_readptr(wave_dev->card, GPR_BASE + pt->pos_gpr, 0);
 229                 if (pos > PT_BLOCKSAMPLES)
 230                         pos = PT_BLOCKSAMPLES;
 231                 pos = 4 * (PT_BLOCKSAMPLES - pos);
 232         } else
 233                 pos = 0;
 234         woinst->total_played = pt->blocks_played * woinst->buffer.fragment_size + pos;
 235         woinst->buffer.hw_pos = pos;
 236 }