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-rw-r--r--sound/isa/sb/emu8000_pcm.c709
1 files changed, 709 insertions, 0 deletions
diff --git a/sound/isa/sb/emu8000_pcm.c b/sound/isa/sb/emu8000_pcm.c
new file mode 100644
index 000000000..f46f6ec3e
--- /dev/null
+++ b/sound/isa/sb/emu8000_pcm.c
@@ -0,0 +1,709 @@
+/*
+ * pcm emulation on emu8000 wavetable
+ *
+ * Copyright (C) 2002 Takashi Iwai <tiwai@suse.de>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#include "emu8000_local.h"
+
+#include <linux/sched/signal.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <sound/initval.h>
+#include <sound/pcm.h>
+
+/*
+ * define the following if you want to use this pcm with non-interleaved mode
+ */
+/* #define USE_NONINTERLEAVE */
+
+/* NOTE: for using the non-interleaved mode with alsa-lib, you have to set
+ * mmap_emulation flag to 1 in your .asoundrc, such like
+ *
+ * pcm.emu8k {
+ * type plug
+ * slave.pcm {
+ * type hw
+ * card 0
+ * device 1
+ * mmap_emulation 1
+ * }
+ * }
+ *
+ * besides, for the time being, the non-interleaved mode doesn't work well on
+ * alsa-lib...
+ */
+
+
+struct snd_emu8k_pcm {
+ struct snd_emu8000 *emu;
+ struct snd_pcm_substream *substream;
+
+ unsigned int allocated_bytes;
+ struct snd_util_memblk *block;
+ unsigned int offset;
+ unsigned int buf_size;
+ unsigned int period_size;
+ unsigned int loop_start[2];
+ unsigned int pitch;
+ int panning[2];
+ int last_ptr;
+ int period_pos;
+ int voices;
+ unsigned int dram_opened: 1;
+ unsigned int running: 1;
+ unsigned int timer_running: 1;
+ struct timer_list timer;
+ spinlock_t timer_lock;
+};
+
+#define LOOP_BLANK_SIZE 8
+
+
+/*
+ * open up channels for the simultaneous data transfer and playback
+ */
+static int
+emu8k_open_dram_for_pcm(struct snd_emu8000 *emu, int channels)
+{
+ int i;
+
+ /* reserve up to 2 voices for playback */
+ snd_emux_lock_voice(emu->emu, 0);
+ if (channels > 1)
+ snd_emux_lock_voice(emu->emu, 1);
+
+ /* reserve 28 voices for loading */
+ for (i = channels + 1; i < EMU8000_DRAM_VOICES; i++) {
+ unsigned int mode = EMU8000_RAM_WRITE;
+ snd_emux_lock_voice(emu->emu, i);
+#ifndef USE_NONINTERLEAVE
+ if (channels > 1 && (i & 1) != 0)
+ mode |= EMU8000_RAM_RIGHT;
+#endif
+ snd_emu8000_dma_chan(emu, i, mode);
+ }
+
+ /* assign voice 31 and 32 to ROM */
+ EMU8000_VTFT_WRITE(emu, 30, 0);
+ EMU8000_PSST_WRITE(emu, 30, 0x1d8);
+ EMU8000_CSL_WRITE(emu, 30, 0x1e0);
+ EMU8000_CCCA_WRITE(emu, 30, 0x1d8);
+ EMU8000_VTFT_WRITE(emu, 31, 0);
+ EMU8000_PSST_WRITE(emu, 31, 0x1d8);
+ EMU8000_CSL_WRITE(emu, 31, 0x1e0);
+ EMU8000_CCCA_WRITE(emu, 31, 0x1d8);
+
+ return 0;
+}
+
+/*
+ */
+static void
+snd_emu8000_write_wait(struct snd_emu8000 *emu, int can_schedule)
+{
+ while ((EMU8000_SMALW_READ(emu) & 0x80000000) != 0) {
+ if (can_schedule) {
+ schedule_timeout_interruptible(1);
+ if (signal_pending(current))
+ break;
+ }
+ }
+}
+
+/*
+ * close all channels
+ */
+static void
+emu8k_close_dram(struct snd_emu8000 *emu)
+{
+ int i;
+
+ for (i = 0; i < 2; i++)
+ snd_emux_unlock_voice(emu->emu, i);
+ for (; i < EMU8000_DRAM_VOICES; i++) {
+ snd_emu8000_dma_chan(emu, i, EMU8000_RAM_CLOSE);
+ snd_emux_unlock_voice(emu->emu, i);
+ }
+}
+
+/*
+ * convert Hz to AWE32 rate offset (see emux/soundfont.c)
+ */
+
+#define OFFSET_SAMPLERATE 1011119 /* base = 44100 */
+#define SAMPLERATE_RATIO 4096
+
+static int calc_rate_offset(int hz)
+{
+ return snd_sf_linear_to_log(hz, OFFSET_SAMPLERATE, SAMPLERATE_RATIO);
+}
+
+
+/*
+ */
+
+static const struct snd_pcm_hardware emu8k_pcm_hw = {
+#ifdef USE_NONINTERLEAVE
+ .info = SNDRV_PCM_INFO_NONINTERLEAVED,
+#else
+ .info = SNDRV_PCM_INFO_INTERLEAVED,
+#endif
+ .formats = SNDRV_PCM_FMTBIT_S16_LE,
+ .rates = SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_8000_48000,
+ .rate_min = 4000,
+ .rate_max = 48000,
+ .channels_min = 1,
+ .channels_max = 2,
+ .buffer_bytes_max = (128*1024),
+ .period_bytes_min = 1024,
+ .period_bytes_max = (128*1024),
+ .periods_min = 2,
+ .periods_max = 1024,
+ .fifo_size = 0,
+
+};
+
+/*
+ * get the current position at the given channel from CCCA register
+ */
+static inline int emu8k_get_curpos(struct snd_emu8k_pcm *rec, int ch)
+{
+ int val = EMU8000_CCCA_READ(rec->emu, ch) & 0xfffffff;
+ val -= rec->loop_start[ch] - 1;
+ return val;
+}
+
+
+/*
+ * timer interrupt handler
+ * check the current position and update the period if necessary.
+ */
+static void emu8k_pcm_timer_func(struct timer_list *t)
+{
+ struct snd_emu8k_pcm *rec = from_timer(rec, t, timer);
+ int ptr, delta;
+
+ spin_lock(&rec->timer_lock);
+ /* update the current pointer */
+ ptr = emu8k_get_curpos(rec, 0);
+ if (ptr < rec->last_ptr)
+ delta = ptr + rec->buf_size - rec->last_ptr;
+ else
+ delta = ptr - rec->last_ptr;
+ rec->period_pos += delta;
+ rec->last_ptr = ptr;
+
+ /* reprogram timer */
+ mod_timer(&rec->timer, jiffies + 1);
+
+ /* update period */
+ if (rec->period_pos >= (int)rec->period_size) {
+ rec->period_pos %= rec->period_size;
+ spin_unlock(&rec->timer_lock);
+ snd_pcm_period_elapsed(rec->substream);
+ return;
+ }
+ spin_unlock(&rec->timer_lock);
+}
+
+
+/*
+ * open pcm
+ * creating an instance here
+ */
+static int emu8k_pcm_open(struct snd_pcm_substream *subs)
+{
+ struct snd_emu8000 *emu = snd_pcm_substream_chip(subs);
+ struct snd_emu8k_pcm *rec;
+ struct snd_pcm_runtime *runtime = subs->runtime;
+
+ rec = kzalloc(sizeof(*rec), GFP_KERNEL);
+ if (! rec)
+ return -ENOMEM;
+
+ rec->emu = emu;
+ rec->substream = subs;
+ runtime->private_data = rec;
+
+ spin_lock_init(&rec->timer_lock);
+ timer_setup(&rec->timer, emu8k_pcm_timer_func, 0);
+
+ runtime->hw = emu8k_pcm_hw;
+ runtime->hw.buffer_bytes_max = emu->mem_size - LOOP_BLANK_SIZE * 3;
+ runtime->hw.period_bytes_max = runtime->hw.buffer_bytes_max / 2;
+
+ /* use timer to update periods.. (specified in msec) */
+ snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_TIME,
+ (1000000 + HZ - 1) / HZ, UINT_MAX);
+
+ return 0;
+}
+
+static int emu8k_pcm_close(struct snd_pcm_substream *subs)
+{
+ struct snd_emu8k_pcm *rec = subs->runtime->private_data;
+ kfree(rec);
+ subs->runtime->private_data = NULL;
+ return 0;
+}
+
+/*
+ * calculate pitch target
+ */
+static int calc_pitch_target(int pitch)
+{
+ int ptarget = 1 << (pitch >> 12);
+ if (pitch & 0x800) ptarget += (ptarget * 0x102e) / 0x2710;
+ if (pitch & 0x400) ptarget += (ptarget * 0x764) / 0x2710;
+ if (pitch & 0x200) ptarget += (ptarget * 0x389) / 0x2710;
+ ptarget += (ptarget >> 1);
+ if (ptarget > 0xffff) ptarget = 0xffff;
+ return ptarget;
+}
+
+/*
+ * set up the voice
+ */
+static void setup_voice(struct snd_emu8k_pcm *rec, int ch)
+{
+ struct snd_emu8000 *hw = rec->emu;
+ unsigned int temp;
+
+ /* channel to be silent and idle */
+ EMU8000_DCYSUSV_WRITE(hw, ch, 0x0080);
+ EMU8000_VTFT_WRITE(hw, ch, 0x0000FFFF);
+ EMU8000_CVCF_WRITE(hw, ch, 0x0000FFFF);
+ EMU8000_PTRX_WRITE(hw, ch, 0);
+ EMU8000_CPF_WRITE(hw, ch, 0);
+
+ /* pitch offset */
+ EMU8000_IP_WRITE(hw, ch, rec->pitch);
+ /* set envelope parameters */
+ EMU8000_ENVVAL_WRITE(hw, ch, 0x8000);
+ EMU8000_ATKHLD_WRITE(hw, ch, 0x7f7f);
+ EMU8000_DCYSUS_WRITE(hw, ch, 0x7f7f);
+ EMU8000_ENVVOL_WRITE(hw, ch, 0x8000);
+ EMU8000_ATKHLDV_WRITE(hw, ch, 0x7f7f);
+ /* decay/sustain parameter for volume envelope is used
+ for triggerg the voice */
+ /* modulation envelope heights */
+ EMU8000_PEFE_WRITE(hw, ch, 0x0);
+ /* lfo1/2 delay */
+ EMU8000_LFO1VAL_WRITE(hw, ch, 0x8000);
+ EMU8000_LFO2VAL_WRITE(hw, ch, 0x8000);
+ /* lfo1 pitch & cutoff shift */
+ EMU8000_FMMOD_WRITE(hw, ch, 0);
+ /* lfo1 volume & freq */
+ EMU8000_TREMFRQ_WRITE(hw, ch, 0);
+ /* lfo2 pitch & freq */
+ EMU8000_FM2FRQ2_WRITE(hw, ch, 0);
+ /* pan & loop start */
+ temp = rec->panning[ch];
+ temp = (temp <<24) | ((unsigned int)rec->loop_start[ch] - 1);
+ EMU8000_PSST_WRITE(hw, ch, temp);
+ /* chorus & loop end (chorus 8bit, MSB) */
+ temp = 0; // chorus
+ temp = (temp << 24) | ((unsigned int)rec->loop_start[ch] + rec->buf_size - 1);
+ EMU8000_CSL_WRITE(hw, ch, temp);
+ /* Q & current address (Q 4bit value, MSB) */
+ temp = 0; // filterQ
+ temp = (temp << 28) | ((unsigned int)rec->loop_start[ch] - 1);
+ EMU8000_CCCA_WRITE(hw, ch, temp);
+ /* clear unknown registers */
+ EMU8000_00A0_WRITE(hw, ch, 0);
+ EMU8000_0080_WRITE(hw, ch, 0);
+}
+
+/*
+ * trigger the voice
+ */
+static void start_voice(struct snd_emu8k_pcm *rec, int ch)
+{
+ unsigned long flags;
+ struct snd_emu8000 *hw = rec->emu;
+ unsigned int temp, aux;
+ int pt = calc_pitch_target(rec->pitch);
+
+ /* cutoff and volume */
+ EMU8000_IFATN_WRITE(hw, ch, 0xff00);
+ EMU8000_VTFT_WRITE(hw, ch, 0xffff);
+ EMU8000_CVCF_WRITE(hw, ch, 0xffff);
+ /* trigger envelope */
+ EMU8000_DCYSUSV_WRITE(hw, ch, 0x7f7f);
+ /* set reverb and pitch target */
+ temp = 0; // reverb
+ if (rec->panning[ch] == 0)
+ aux = 0xff;
+ else
+ aux = (-rec->panning[ch]) & 0xff;
+ temp = (temp << 8) | (pt << 16) | aux;
+ EMU8000_PTRX_WRITE(hw, ch, temp);
+ EMU8000_CPF_WRITE(hw, ch, pt << 16);
+
+ /* start timer */
+ spin_lock_irqsave(&rec->timer_lock, flags);
+ if (! rec->timer_running) {
+ mod_timer(&rec->timer, jiffies + 1);
+ rec->timer_running = 1;
+ }
+ spin_unlock_irqrestore(&rec->timer_lock, flags);
+}
+
+/*
+ * stop the voice immediately
+ */
+static void stop_voice(struct snd_emu8k_pcm *rec, int ch)
+{
+ unsigned long flags;
+ struct snd_emu8000 *hw = rec->emu;
+
+ EMU8000_DCYSUSV_WRITE(hw, ch, 0x807F);
+
+ /* stop timer */
+ spin_lock_irqsave(&rec->timer_lock, flags);
+ if (rec->timer_running) {
+ del_timer(&rec->timer);
+ rec->timer_running = 0;
+ }
+ spin_unlock_irqrestore(&rec->timer_lock, flags);
+}
+
+static int emu8k_pcm_trigger(struct snd_pcm_substream *subs, int cmd)
+{
+ struct snd_emu8k_pcm *rec = subs->runtime->private_data;
+ int ch;
+
+ switch (cmd) {
+ case SNDRV_PCM_TRIGGER_START:
+ for (ch = 0; ch < rec->voices; ch++)
+ start_voice(rec, ch);
+ rec->running = 1;
+ break;
+ case SNDRV_PCM_TRIGGER_STOP:
+ rec->running = 0;
+ for (ch = 0; ch < rec->voices; ch++)
+ stop_voice(rec, ch);
+ break;
+ default:
+ return -EINVAL;
+ }
+ return 0;
+}
+
+
+/*
+ * copy / silence ops
+ */
+
+/*
+ * this macro should be inserted in the copy/silence loops
+ * to reduce the latency. without this, the system will hang up
+ * during the whole loop.
+ */
+#define CHECK_SCHEDULER() \
+do { \
+ cond_resched();\
+ if (signal_pending(current))\
+ return -EAGAIN;\
+} while (0)
+
+enum {
+ COPY_USER, COPY_KERNEL, FILL_SILENCE,
+};
+
+#define GET_VAL(sval, buf, mode) \
+ do { \
+ switch (mode) { \
+ case FILL_SILENCE: \
+ sval = 0; \
+ break; \
+ case COPY_KERNEL: \
+ sval = *buf++; \
+ break; \
+ default: \
+ if (get_user(sval, (unsigned short __user *)buf)) \
+ return -EFAULT; \
+ buf++; \
+ break; \
+ } \
+ } while (0)
+
+#ifdef USE_NONINTERLEAVE
+
+#define LOOP_WRITE(rec, offset, _buf, count, mode) \
+ do { \
+ struct snd_emu8000 *emu = (rec)->emu; \
+ unsigned short *buf = (unsigned short *)(_buf); \
+ snd_emu8000_write_wait(emu, 1); \
+ EMU8000_SMALW_WRITE(emu, offset); \
+ while (count > 0) { \
+ unsigned short sval; \
+ CHECK_SCHEDULER(); \
+ GET_VAL(sval, buf, mode); \
+ EMU8000_SMLD_WRITE(emu, sval); \
+ count--; \
+ } \
+ } while (0)
+
+/* copy one channel block */
+static int emu8k_pcm_copy(struct snd_pcm_substream *subs,
+ int voice, unsigned long pos,
+ void __user *src, unsigned long count)
+{
+ struct snd_emu8k_pcm *rec = subs->runtime->private_data;
+
+ /* convert to word unit */
+ pos = (pos << 1) + rec->loop_start[voice];
+ count <<= 1;
+ LOOP_WRITE(rec, pos, src, count, COPY_USER);
+ return 0;
+}
+
+static int emu8k_pcm_copy_kernel(struct snd_pcm_substream *subs,
+ int voice, unsigned long pos,
+ void *src, unsigned long count)
+{
+ struct snd_emu8k_pcm *rec = subs->runtime->private_data;
+
+ /* convert to word unit */
+ pos = (pos << 1) + rec->loop_start[voice];
+ count <<= 1;
+ LOOP_WRITE(rec, pos, src, count, COPY_KERNEL);
+ return 0;
+}
+
+/* make a channel block silence */
+static int emu8k_pcm_silence(struct snd_pcm_substream *subs,
+ int voice, unsigned long pos, unsigned long count)
+{
+ struct snd_emu8k_pcm *rec = subs->runtime->private_data;
+
+ /* convert to word unit */
+ pos = (pos << 1) + rec->loop_start[voice];
+ count <<= 1;
+ LOOP_WRITE(rec, pos, NULL, count, FILL_SILENCE);
+ return 0;
+}
+
+#else /* interleave */
+
+#define LOOP_WRITE(rec, pos, _buf, count, mode) \
+ do { \
+ struct snd_emu8000 *emu = rec->emu; \
+ unsigned short *buf = (unsigned short *)(_buf); \
+ snd_emu8000_write_wait(emu, 1); \
+ EMU8000_SMALW_WRITE(emu, pos + rec->loop_start[0]); \
+ if (rec->voices > 1) \
+ EMU8000_SMARW_WRITE(emu, pos + rec->loop_start[1]); \
+ while (count > 0) { \
+ unsigned short sval; \
+ CHECK_SCHEDULER(); \
+ GET_VAL(sval, buf, mode); \
+ EMU8000_SMLD_WRITE(emu, sval); \
+ if (rec->voices > 1) { \
+ CHECK_SCHEDULER(); \
+ GET_VAL(sval, buf, mode); \
+ EMU8000_SMRD_WRITE(emu, sval); \
+ } \
+ count--; \
+ } \
+ } while (0)
+
+
+/*
+ * copy the interleaved data can be done easily by using
+ * DMA "left" and "right" channels on emu8k engine.
+ */
+static int emu8k_pcm_copy(struct snd_pcm_substream *subs,
+ int voice, unsigned long pos,
+ void __user *src, unsigned long count)
+{
+ struct snd_emu8k_pcm *rec = subs->runtime->private_data;
+
+ /* convert to frames */
+ pos = bytes_to_frames(subs->runtime, pos);
+ count = bytes_to_frames(subs->runtime, count);
+ LOOP_WRITE(rec, pos, src, count, COPY_USER);
+ return 0;
+}
+
+static int emu8k_pcm_copy_kernel(struct snd_pcm_substream *subs,
+ int voice, unsigned long pos,
+ void *src, unsigned long count)
+{
+ struct snd_emu8k_pcm *rec = subs->runtime->private_data;
+
+ /* convert to frames */
+ pos = bytes_to_frames(subs->runtime, pos);
+ count = bytes_to_frames(subs->runtime, count);
+ LOOP_WRITE(rec, pos, src, count, COPY_KERNEL);
+ return 0;
+}
+
+static int emu8k_pcm_silence(struct snd_pcm_substream *subs,
+ int voice, unsigned long pos, unsigned long count)
+{
+ struct snd_emu8k_pcm *rec = subs->runtime->private_data;
+
+ /* convert to frames */
+ pos = bytes_to_frames(subs->runtime, pos);
+ count = bytes_to_frames(subs->runtime, count);
+ LOOP_WRITE(rec, pos, NULL, count, FILL_SILENCE);
+ return 0;
+}
+#endif
+
+
+/*
+ * allocate a memory block
+ */
+static int emu8k_pcm_hw_params(struct snd_pcm_substream *subs,
+ struct snd_pcm_hw_params *hw_params)
+{
+ struct snd_emu8k_pcm *rec = subs->runtime->private_data;
+
+ if (rec->block) {
+ /* reallocation - release the old block */
+ snd_util_mem_free(rec->emu->memhdr, rec->block);
+ rec->block = NULL;
+ }
+
+ rec->allocated_bytes = params_buffer_bytes(hw_params) + LOOP_BLANK_SIZE * 4;
+ rec->block = snd_util_mem_alloc(rec->emu->memhdr, rec->allocated_bytes);
+ if (! rec->block)
+ return -ENOMEM;
+ rec->offset = EMU8000_DRAM_OFFSET + (rec->block->offset >> 1); /* in word */
+ /* at least dma_bytes must be set for non-interleaved mode */
+ subs->dma_buffer.bytes = params_buffer_bytes(hw_params);
+
+ return 0;
+}
+
+/*
+ * free the memory block
+ */
+static int emu8k_pcm_hw_free(struct snd_pcm_substream *subs)
+{
+ struct snd_emu8k_pcm *rec = subs->runtime->private_data;
+
+ if (rec->block) {
+ int ch;
+ for (ch = 0; ch < rec->voices; ch++)
+ stop_voice(rec, ch); // to be sure
+ if (rec->dram_opened)
+ emu8k_close_dram(rec->emu);
+ snd_util_mem_free(rec->emu->memhdr, rec->block);
+ rec->block = NULL;
+ }
+ return 0;
+}
+
+/*
+ */
+static int emu8k_pcm_prepare(struct snd_pcm_substream *subs)
+{
+ struct snd_emu8k_pcm *rec = subs->runtime->private_data;
+
+ rec->pitch = 0xe000 + calc_rate_offset(subs->runtime->rate);
+ rec->last_ptr = 0;
+ rec->period_pos = 0;
+
+ rec->buf_size = subs->runtime->buffer_size;
+ rec->period_size = subs->runtime->period_size;
+ rec->voices = subs->runtime->channels;
+ rec->loop_start[0] = rec->offset + LOOP_BLANK_SIZE;
+ if (rec->voices > 1)
+ rec->loop_start[1] = rec->loop_start[0] + rec->buf_size + LOOP_BLANK_SIZE;
+ if (rec->voices > 1) {
+ rec->panning[0] = 0xff;
+ rec->panning[1] = 0x00;
+ } else
+ rec->panning[0] = 0x80;
+
+ if (! rec->dram_opened) {
+ int err, i, ch;
+
+ snd_emux_terminate_all(rec->emu->emu);
+ if ((err = emu8k_open_dram_for_pcm(rec->emu, rec->voices)) != 0)
+ return err;
+ rec->dram_opened = 1;
+
+ /* clear loop blanks */
+ snd_emu8000_write_wait(rec->emu, 0);
+ EMU8000_SMALW_WRITE(rec->emu, rec->offset);
+ for (i = 0; i < LOOP_BLANK_SIZE; i++)
+ EMU8000_SMLD_WRITE(rec->emu, 0);
+ for (ch = 0; ch < rec->voices; ch++) {
+ EMU8000_SMALW_WRITE(rec->emu, rec->loop_start[ch] + rec->buf_size);
+ for (i = 0; i < LOOP_BLANK_SIZE; i++)
+ EMU8000_SMLD_WRITE(rec->emu, 0);
+ }
+ }
+
+ setup_voice(rec, 0);
+ if (rec->voices > 1)
+ setup_voice(rec, 1);
+ return 0;
+}
+
+static snd_pcm_uframes_t emu8k_pcm_pointer(struct snd_pcm_substream *subs)
+{
+ struct snd_emu8k_pcm *rec = subs->runtime->private_data;
+ if (rec->running)
+ return emu8k_get_curpos(rec, 0);
+ return 0;
+}
+
+
+static const struct snd_pcm_ops emu8k_pcm_ops = {
+ .open = emu8k_pcm_open,
+ .close = emu8k_pcm_close,
+ .ioctl = snd_pcm_lib_ioctl,
+ .hw_params = emu8k_pcm_hw_params,
+ .hw_free = emu8k_pcm_hw_free,
+ .prepare = emu8k_pcm_prepare,
+ .trigger = emu8k_pcm_trigger,
+ .pointer = emu8k_pcm_pointer,
+ .copy_user = emu8k_pcm_copy,
+ .copy_kernel = emu8k_pcm_copy_kernel,
+ .fill_silence = emu8k_pcm_silence,
+};
+
+
+static void snd_emu8000_pcm_free(struct snd_pcm *pcm)
+{
+ struct snd_emu8000 *emu = pcm->private_data;
+ emu->pcm = NULL;
+}
+
+int snd_emu8000_pcm_new(struct snd_card *card, struct snd_emu8000 *emu, int index)
+{
+ struct snd_pcm *pcm;
+ int err;
+
+ if ((err = snd_pcm_new(card, "Emu8000 PCM", index, 1, 0, &pcm)) < 0)
+ return err;
+ pcm->private_data = emu;
+ pcm->private_free = snd_emu8000_pcm_free;
+ snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &emu8k_pcm_ops);
+ emu->pcm = pcm;
+
+ snd_device_register(card, pcm);
+
+ return 0;
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-24 15:10:27 +0000