353 lines
8.8 KiB
C
353 lines
8.8 KiB
C
|
// SPDX-License-Identifier: GPL-2.0
|
||
|
|
/*
|
||
|
|
* PC-Speaker driver for Linux
|
||
|
|
*
|
||
|
|
* Copyright (C) 1993-1997 Michael Beck
|
||
|
|
* Copyright (C) 1997-2001 David Woodhouse
|
||
|
|
* Copyright (C) 2001-2008 Stas Sergeev
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include <linux/module.h>
|
||
|
|
#include <linux/gfp.h>
|
||
|
|
#include <linux/moduleparam.h>
|
||
|
|
#include <linux/interrupt.h>
|
||
|
|
#include <linux/io.h>
|
||
|
|
#include <sound/pcm.h>
|
||
|
|
#include "pcsp.h"
|
||
|
|
|
||
|
|
static bool nforce_wa;
|
||
|
|
module_param(nforce_wa, bool, 0444);
|
||
|
|
MODULE_PARM_DESC(nforce_wa, "Apply NForce chipset workaround "
|
||
|
|
"(expect bad sound)");
|
||
|
|
|
||
|
|
#define DMIX_WANTS_S16 1
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Call snd_pcm_period_elapsed in a work
|
||
|
|
* This avoids spinlock messes and long-running irq contexts
|
||
|
|
*/
|
||
|
|
static void pcsp_call_pcm_elapsed(struct work_struct *work)
|
||
|
|
{
|
||
|
|
if (atomic_read(&pcsp_chip.timer_active)) {
|
||
|
|
struct snd_pcm_substream *substream;
|
||
|
|
substream = pcsp_chip.playback_substream;
|
||
|
|
if (substream)
|
||
|
|
snd_pcm_period_elapsed(substream);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
static DECLARE_WORK(pcsp_pcm_work, pcsp_call_pcm_elapsed);
|
||
|
|
|
||
|
|
/* write the port and returns the next expire time in ns;
|
||
|
|
* called at the trigger-start and in hrtimer callback
|
||
|
|
*/
|
||
|
|
static u64 pcsp_timer_update(struct snd_pcsp *chip)
|
||
|
|
{
|
||
|
|
unsigned char timer_cnt, val;
|
||
|
|
u64 ns;
|
||
|
|
struct snd_pcm_substream *substream;
|
||
|
|
struct snd_pcm_runtime *runtime;
|
||
|
|
unsigned long flags;
|
||
|
|
|
||
|
|
if (chip->thalf) {
|
||
|
|
outb(chip->val61, 0x61);
|
||
|
|
chip->thalf = 0;
|
||
|
|
return chip->ns_rem;
|
||
|
|
}
|
||
|
|
|
||
|
|
substream = chip->playback_substream;
|
||
|
|
if (!substream)
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
runtime = substream->runtime;
|
||
|
|
/* assume it is mono! */
|
||
|
|
val = runtime->dma_area[chip->playback_ptr + chip->fmt_size - 1];
|
||
|
|
if (chip->is_signed)
|
||
|
|
val ^= 0x80;
|
||
|
|
timer_cnt = val * CUR_DIV() / 256;
|
||
|
|
|
||
|
|
if (timer_cnt && chip->enable) {
|
||
|
|
raw_spin_lock_irqsave(&i8253_lock, flags);
|
||
|
|
if (!nforce_wa) {
|
||
|
|
outb_p(chip->val61, 0x61);
|
||
|
|
outb_p(timer_cnt, 0x42);
|
||
|
|
outb(chip->val61 ^ 1, 0x61);
|
||
|
|
} else {
|
||
|
|
outb(chip->val61 ^ 2, 0x61);
|
||
|
|
chip->thalf = 1;
|
||
|
|
}
|
||
|
|
raw_spin_unlock_irqrestore(&i8253_lock, flags);
|
||
|
|
}
|
||
|
|
|
||
|
|
chip->ns_rem = PCSP_PERIOD_NS();
|
||
|
|
ns = (chip->thalf ? PCSP_CALC_NS(timer_cnt) : chip->ns_rem);
|
||
|
|
chip->ns_rem -= ns;
|
||
|
|
return ns;
|
||
|
|
}
|
||
|
|
|
||
|
|
static void pcsp_pointer_update(struct snd_pcsp *chip)
|
||
|
|
{
|
||
|
|
struct snd_pcm_substream *substream;
|
||
|
|
size_t period_bytes, buffer_bytes;
|
||
|
|
int periods_elapsed;
|
||
|
|
unsigned long flags;
|
||
|
|
|
||
|
|
/* update the playback position */
|
||
|
|
substream = chip->playback_substream;
|
||
|
|
if (!substream)
|
||
|
|
return;
|
||
|
|
|
||
|
|
period_bytes = snd_pcm_lib_period_bytes(substream);
|
||
|
|
buffer_bytes = snd_pcm_lib_buffer_bytes(substream);
|
||
|
|
|
||
|
|
spin_lock_irqsave(&chip->substream_lock, flags);
|
||
|
|
chip->playback_ptr += PCSP_INDEX_INC() * chip->fmt_size;
|
||
|
|
periods_elapsed = chip->playback_ptr - chip->period_ptr;
|
||
|
|
if (periods_elapsed < 0) {
|
||
|
|
#if PCSP_DEBUG
|
||
|
|
printk(KERN_INFO "PCSP: buffer_bytes mod period_bytes != 0 ? "
|
||
|
|
"(%zi %zi %zi)\n",
|
||
|
|
chip->playback_ptr, period_bytes, buffer_bytes);
|
||
|
|
#endif
|
||
|
|
periods_elapsed += buffer_bytes;
|
||
|
|
}
|
||
|
|
periods_elapsed /= period_bytes;
|
||
|
|
/* wrap the pointer _before_ calling snd_pcm_period_elapsed(),
|
||
|
|
* or ALSA will BUG on us. */
|
||
|
|
chip->playback_ptr %= buffer_bytes;
|
||
|
|
|
||
|
|
if (periods_elapsed) {
|
||
|
|
chip->period_ptr += periods_elapsed * period_bytes;
|
||
|
|
chip->period_ptr %= buffer_bytes;
|
||
|
|
queue_work(system_highpri_wq, &pcsp_pcm_work);
|
||
|
|
}
|
||
|
|
spin_unlock_irqrestore(&chip->substream_lock, flags);
|
||
|
|
}
|
||
|
|
|
||
|
|
enum hrtimer_restart pcsp_do_timer(struct hrtimer *handle)
|
||
|
|
{
|
||
|
|
struct snd_pcsp *chip = container_of(handle, struct snd_pcsp, timer);
|
||
|
|
int pointer_update;
|
||
|
|
u64 ns;
|
||
|
|
|
||
|
|
if (!atomic_read(&chip->timer_active) || !chip->playback_substream)
|
||
|
|
return HRTIMER_NORESTART;
|
||
|
|
|
||
|
|
pointer_update = !chip->thalf;
|
||
|
|
ns = pcsp_timer_update(chip);
|
||
|
|
if (!ns) {
|
||
|
|
printk(KERN_WARNING "PCSP: unexpected stop\n");
|
||
|
|
return HRTIMER_NORESTART;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (pointer_update)
|
||
|
|
pcsp_pointer_update(chip);
|
||
|
|
|
||
|
|
hrtimer_forward_now(handle, ns_to_ktime(ns));
|
||
|
|
|
||
|
|
return HRTIMER_RESTART;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int pcsp_start_playing(struct snd_pcsp *chip)
|
||
|
|
{
|
||
|
|
#if PCSP_DEBUG
|
||
|
|
printk(KERN_INFO "PCSP: start_playing called\n");
|
||
|
|
#endif
|
||
|
|
if (atomic_read(&chip->timer_active)) {
|
||
|
|
printk(KERN_ERR "PCSP: Timer already active\n");
|
||
|
|
return -EIO;
|
||
|
|
}
|
||
|
|
|
||
|
|
raw_spin_lock(&i8253_lock);
|
||
|
|
chip->val61 = inb(0x61) | 0x03;
|
||
|
|
outb_p(0x92, 0x43); /* binary, mode 1, LSB only, ch 2 */
|
||
|
|
raw_spin_unlock(&i8253_lock);
|
||
|
|
atomic_set(&chip->timer_active, 1);
|
||
|
|
chip->thalf = 0;
|
||
|
|
|
||
|
|
hrtimer_start(&pcsp_chip.timer, 0, HRTIMER_MODE_REL);
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static void pcsp_stop_playing(struct snd_pcsp *chip)
|
||
|
|
{
|
||
|
|
#if PCSP_DEBUG
|
||
|
|
printk(KERN_INFO "PCSP: stop_playing called\n");
|
||
|
|
#endif
|
||
|
|
if (!atomic_read(&chip->timer_active))
|
||
|
|
return;
|
||
|
|
|
||
|
|
atomic_set(&chip->timer_active, 0);
|
||
|
|
raw_spin_lock(&i8253_lock);
|
||
|
|
/* restore the timer */
|
||
|
|
outb_p(0xb6, 0x43); /* binary, mode 3, LSB/MSB, ch 2 */
|
||
|
|
outb(chip->val61 & 0xFC, 0x61);
|
||
|
|
raw_spin_unlock(&i8253_lock);
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Force to stop and sync the stream
|
||
|
|
*/
|
||
|
|
void pcsp_sync_stop(struct snd_pcsp *chip)
|
||
|
|
{
|
||
|
|
local_irq_disable();
|
||
|
|
pcsp_stop_playing(chip);
|
||
|
|
local_irq_enable();
|
||
|
|
hrtimer_cancel(&chip->timer);
|
||
|
|
cancel_work_sync(&pcsp_pcm_work);
|
||
|
|
}
|
||
|
|
|
||
|
|
static int snd_pcsp_playback_close(struct snd_pcm_substream *substream)
|
||
|
|
{
|
||
|
|
struct snd_pcsp *chip = snd_pcm_substream_chip(substream);
|
||
|
|
#if PCSP_DEBUG
|
||
|
|
printk(KERN_INFO "PCSP: close called\n");
|
||
|
|
#endif
|
||
|
|
pcsp_sync_stop(chip);
|
||
|
|
chip->playback_substream = NULL;
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int snd_pcsp_playback_hw_params(struct snd_pcm_substream *substream,
|
||
|
|
struct snd_pcm_hw_params *hw_params)
|
||
|
|
{
|
||
|
|
struct snd_pcsp *chip = snd_pcm_substream_chip(substream);
|
||
|
|
pcsp_sync_stop(chip);
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int snd_pcsp_playback_hw_free(struct snd_pcm_substream *substream)
|
||
|
|
{
|
||
|
|
struct snd_pcsp *chip = snd_pcm_substream_chip(substream);
|
||
|
|
#if PCSP_DEBUG
|
||
|
|
printk(KERN_INFO "PCSP: hw_free called\n");
|
||
|
|
#endif
|
||
|
|
pcsp_sync_stop(chip);
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int snd_pcsp_playback_prepare(struct snd_pcm_substream *substream)
|
||
|
|
{
|
||
|
|
struct snd_pcsp *chip = snd_pcm_substream_chip(substream);
|
||
|
|
pcsp_sync_stop(chip);
|
||
|
|
chip->playback_ptr = 0;
|
||
|
|
chip->period_ptr = 0;
|
||
|
|
chip->fmt_size =
|
||
|
|
snd_pcm_format_physical_width(substream->runtime->format) >> 3;
|
||
|
|
chip->is_signed = snd_pcm_format_signed(substream->runtime->format);
|
||
|
|
#if PCSP_DEBUG
|
||
|
|
printk(KERN_INFO "PCSP: prepare called, "
|
||
|
|
"size=%zi psize=%zi f=%zi f1=%i fsize=%i\n",
|
||
|
|
snd_pcm_lib_buffer_bytes(substream),
|
||
|
|
snd_pcm_lib_period_bytes(substream),
|
||
|
|
snd_pcm_lib_buffer_bytes(substream) /
|
||
|
|
snd_pcm_lib_period_bytes(substream),
|
||
|
|
substream->runtime->periods,
|
||
|
|
chip->fmt_size);
|
||
|
|
#endif
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int snd_pcsp_trigger(struct snd_pcm_substream *substream, int cmd)
|
||
|
|
{
|
||
|
|
struct snd_pcsp *chip = snd_pcm_substream_chip(substream);
|
||
|
|
#if PCSP_DEBUG
|
||
|
|
printk(KERN_INFO "PCSP: trigger called\n");
|
||
|
|
#endif
|
||
|
|
switch (cmd) {
|
||
|
|
case SNDRV_PCM_TRIGGER_START:
|
||
|
|
case SNDRV_PCM_TRIGGER_RESUME:
|
||
|
|
return pcsp_start_playing(chip);
|
||
|
|
case SNDRV_PCM_TRIGGER_STOP:
|
||
|
|
case SNDRV_PCM_TRIGGER_SUSPEND:
|
||
|
|
pcsp_stop_playing(chip);
|
||
|
|
break;
|
||
|
|
default:
|
||
|
|
return -EINVAL;
|
||
|
|
}
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static snd_pcm_uframes_t snd_pcsp_playback_pointer(struct snd_pcm_substream
|
||
|
|
*substream)
|
||
|
|
{
|
||
|
|
struct snd_pcsp *chip = snd_pcm_substream_chip(substream);
|
||
|
|
unsigned int pos;
|
||
|
|
spin_lock(&chip->substream_lock);
|
||
|
|
pos = chip->playback_ptr;
|
||
|
|
spin_unlock(&chip->substream_lock);
|
||
|
|
return bytes_to_frames(substream->runtime, pos);
|
||
|
|
}
|
||
|
|
|
||
|
|
static const struct snd_pcm_hardware snd_pcsp_playback = {
|
||
|
|
.info = (SNDRV_PCM_INFO_INTERLEAVED |
|
||
|
|
SNDRV_PCM_INFO_HALF_DUPLEX |
|
||
|
|
SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID),
|
||
|
|
.formats = (SNDRV_PCM_FMTBIT_U8
|
||
|
|
#if DMIX_WANTS_S16
|
||
|
|
| SNDRV_PCM_FMTBIT_S16_LE
|
||
|
|
#endif
|
||
|
|
),
|
||
|
|
.rates = SNDRV_PCM_RATE_KNOT,
|
||
|
|
.rate_min = PCSP_DEFAULT_SRATE,
|
||
|
|
.rate_max = PCSP_DEFAULT_SRATE,
|
||
|
|
.channels_min = 1,
|
||
|
|
.channels_max = 1,
|
||
|
|
.buffer_bytes_max = PCSP_BUFFER_SIZE,
|
||
|
|
.period_bytes_min = 64,
|
||
|
|
.period_bytes_max = PCSP_MAX_PERIOD_SIZE,
|
||
|
|
.periods_min = 2,
|
||
|
|
.periods_max = PCSP_MAX_PERIODS,
|
||
|
|
.fifo_size = 0,
|
||
|
|
};
|
||
|
|
|
||
|
|
static int snd_pcsp_playback_open(struct snd_pcm_substream *substream)
|
||
|
|
{
|
||
|
|
struct snd_pcsp *chip = snd_pcm_substream_chip(substream);
|
||
|
|
struct snd_pcm_runtime *runtime = substream->runtime;
|
||
|
|
#if PCSP_DEBUG
|
||
|
|
printk(KERN_INFO "PCSP: open called\n");
|
||
|
|
#endif
|
||
|
|
if (atomic_read(&chip->timer_active)) {
|
||
|
|
printk(KERN_ERR "PCSP: still active!!\n");
|
||
|
|
return -EBUSY;
|
||
|
|
}
|
||
|
|
runtime->hw = snd_pcsp_playback;
|
||
|
|
chip->playback_substream = substream;
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static const struct snd_pcm_ops snd_pcsp_playback_ops = {
|
||
|
|
.open = snd_pcsp_playback_open,
|
||
|
|
.close = snd_pcsp_playback_close,
|
||
|
|
.hw_params = snd_pcsp_playback_hw_params,
|
||
|
|
.hw_free = snd_pcsp_playback_hw_free,
|
||
|
|
.prepare = snd_pcsp_playback_prepare,
|
||
|
|
.trigger = snd_pcsp_trigger,
|
||
|
|
.pointer = snd_pcsp_playback_pointer,
|
||
|
|
};
|
||
|
|
|
||
|
|
int snd_pcsp_new_pcm(struct snd_pcsp *chip)
|
||
|
|
{
|
||
|
|
int err;
|
||
|
|
|
||
|
|
err = snd_pcm_new(chip->card, "pcspeaker", 0, 1, 0, &chip->pcm);
|
||
|
|
if (err < 0)
|
||
|
|
return err;
|
||
|
|
|
||
|
|
snd_pcm_set_ops(chip->pcm, SNDRV_PCM_STREAM_PLAYBACK,
|
||
|
|
&snd_pcsp_playback_ops);
|
||
|
|
|
||
|
|
chip->pcm->private_data = chip;
|
||
|
|
chip->pcm->info_flags = SNDRV_PCM_INFO_HALF_DUPLEX;
|
||
|
|
strcpy(chip->pcm->name, "pcsp");
|
||
|
|
|
||
|
|
snd_pcm_set_managed_buffer_all(chip->pcm,
|
||
|
|
SNDRV_DMA_TYPE_CONTINUOUS,
|
||
|
|
NULL,
|
||
|
|
PCSP_BUFFER_SIZE,
|
||
|
|
PCSP_BUFFER_SIZE);
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|