[ALSA] Add PC-speaker sound driver

Added PC-speaker sound driver (snd-pcsp).

Signed-off-by: Stas Sergeev <stsp@aknet.ru>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Stas Sergeev 2008-03-03 10:53:54 +01:00 committed by Takashi Iwai
parent 40ac8c4f20
commit 9ab4d072ad
9 changed files with 963 additions and 1 deletions

View file

@ -4,6 +4,23 @@ menu "Generic devices"
depends on SND!=n
config SND_PCSP
tristate "Internal PC speaker support"
depends on X86_PC && HIGH_RES_TIMERS
help
If you don't have a sound card in your computer, you can include a
driver for the PC speaker which allows it to act like a primitive
sound card.
This driver also replaces the pcspkr driver for beeps.
You can compile this as a module which will be called snd-pcsp.
You don't need this driver if you only want your pc-speaker to beep.
You don't need this driver if you have a tablet piezo beeper
in your PC instead of the real speaker.
It should not hurt to say Y or M here in all other cases.
config SND_MPU401_UART
tristate
select SND_RAWMIDI

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@ -20,4 +20,4 @@ obj-$(CONFIG_SND_MTS64) += snd-mts64.o
obj-$(CONFIG_SND_PORTMAN2X4) += snd-portman2x4.o
obj-$(CONFIG_SND_ML403_AC97CR) += snd-ml403-ac97cr.o
obj-$(CONFIG_SND) += opl3/ opl4/ mpu401/ vx/
obj-$(CONFIG_SND) += opl3/ opl4/ mpu401/ vx/ pcsp/

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@ -0,0 +1,2 @@
snd-pcsp-objs := pcsp.o pcsp_lib.o pcsp_mixer.o pcsp_input.o
obj-$(CONFIG_SND_PCSP) += snd-pcsp.o

241
sound/drivers/pcsp/pcsp.c Normal file
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@ -0,0 +1,241 @@
/*
* PC-Speaker driver for Linux
*
* Copyright (C) 1997-2001 David Woodhouse
* Copyright (C) 2001-2008 Stas Sergeev
*/
#include <linux/init.h>
#include <linux/moduleparam.h>
#include <linux/platform_device.h>
#include <sound/core.h>
#include <sound/initval.h>
#include <sound/pcm.h>
#include <linux/input.h>
#include <linux/delay.h>
#include <asm/bitops.h>
#include "pcsp_input.h"
#include "pcsp.h"
MODULE_AUTHOR("Stas Sergeev <stsp@users.sourceforge.net>");
MODULE_DESCRIPTION("PC-Speaker driver");
MODULE_LICENSE("GPL");
MODULE_SUPPORTED_DEVICE("{{PC-Speaker, pcsp}}");
MODULE_ALIAS("platform:pcspkr");
static int index = SNDRV_DEFAULT_IDX1; /* Index 0-MAX */
static char *id = SNDRV_DEFAULT_STR1; /* ID for this card */
static int enable = SNDRV_DEFAULT_ENABLE1; /* Enable this card */
module_param(index, int, 0444);
MODULE_PARM_DESC(index, "Index value for pcsp soundcard.");
module_param(id, charp, 0444);
MODULE_PARM_DESC(id, "ID string for pcsp soundcard.");
module_param(enable, bool, 0444);
MODULE_PARM_DESC(enable, "dummy");
struct snd_pcsp pcsp_chip;
static int __devinit snd_pcsp_create(struct snd_card *card)
{
static struct snd_device_ops ops = { };
struct timespec tp;
int err;
int div, min_div, order;
hrtimer_get_res(CLOCK_MONOTONIC, &tp);
if (tp.tv_sec || tp.tv_nsec > PCSP_MAX_PERIOD_NS) {
printk(KERN_ERR "PCSP: Timer resolution is not sufficient "
"(%linS)\n", tp.tv_nsec);
printk(KERN_ERR "PCSP: Make sure you have HPET and ACPI "
"enabled.\n");
return -EIO;
}
if (loops_per_jiffy >= PCSP_MIN_LPJ && tp.tv_nsec <= PCSP_MIN_PERIOD_NS)
min_div = MIN_DIV;
else
min_div = MAX_DIV;
#if PCSP_DEBUG
printk("PCSP: lpj=%li, min_div=%i, res=%li\n",
loops_per_jiffy, min_div, tp.tv_nsec);
#endif
div = MAX_DIV / min_div;
order = fls(div) - 1;
pcsp_chip.max_treble = min(order, PCSP_MAX_TREBLE);
pcsp_chip.treble = min(pcsp_chip.max_treble, PCSP_DEFAULT_TREBLE);
pcsp_chip.playback_ptr = 0;
pcsp_chip.period_ptr = 0;
atomic_set(&pcsp_chip.timer_active, 0);
pcsp_chip.enable = 1;
pcsp_chip.pcspkr = 1;
spin_lock_init(&pcsp_chip.substream_lock);
pcsp_chip.card = card;
pcsp_chip.port = 0x61;
pcsp_chip.irq = -1;
pcsp_chip.dma = -1;
/* Register device */
err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, &pcsp_chip, &ops);
if (err < 0)
return err;
return 0;
}
static int __devinit snd_card_pcsp_probe(int devnum, struct device *dev)
{
struct snd_card *card;
int err;
if (devnum != 0)
return -EINVAL;
hrtimer_init(&pcsp_chip.timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
pcsp_chip.timer.cb_mode = HRTIMER_CB_IRQSAFE;
pcsp_chip.timer.function = pcsp_do_timer;
card = snd_card_new(index, id, THIS_MODULE, 0);
if (!card)
return -ENOMEM;
err = snd_pcsp_create(card);
if (err < 0) {
snd_card_free(card);
return err;
}
err = snd_pcsp_new_pcm(&pcsp_chip);
if (err < 0) {
snd_card_free(card);
return err;
}
err = snd_pcsp_new_mixer(&pcsp_chip);
if (err < 0) {
snd_card_free(card);
return err;
}
snd_card_set_dev(pcsp_chip.card, dev);
strcpy(card->driver, "PC-Speaker");
strcpy(card->shortname, "pcsp");
sprintf(card->longname, "Internal PC-Speaker at port 0x%x",
pcsp_chip.port);
err = snd_card_register(card);
if (err < 0) {
snd_card_free(card);
return err;
}
return 0;
}
static int __devinit alsa_card_pcsp_init(struct device *dev)
{
int devnum = 0, cards = 0;
#ifdef CONFIG_DEBUG_PAGEALLOC
/* Well, CONFIG_DEBUG_PAGEALLOC makes the sound horrible. Lets alert */
printk(KERN_WARNING
"PCSP: Warning, CONFIG_DEBUG_PAGEALLOC is enabled!\n"
"You have to disable it if you want to use the PC-Speaker "
"driver.\n"
"Unless it is disabled, enjoy the horrible, distorted "
"and crackling noise.\n");
#endif
if (enable) {
if (snd_card_pcsp_probe(devnum, dev) >= 0)
cards++;
if (!cards) {
printk(KERN_ERR "PC-Speaker initialization failed.\n");
return -ENODEV;
}
}
return 0;
}
static void __devexit alsa_card_pcsp_exit(struct snd_pcsp *chip)
{
snd_card_free(chip->card);
}
static int __devinit pcsp_probe(struct platform_device *dev)
{
int err;
err = pcspkr_input_init(&pcsp_chip.input_dev, &dev->dev);
if (err < 0)
return err;
err = alsa_card_pcsp_init(&dev->dev);
if (err < 0) {
pcspkr_input_remove(pcsp_chip.input_dev);
return err;
}
platform_set_drvdata(dev, &pcsp_chip);
return 0;
}
static int __devexit pcsp_remove(struct platform_device *dev)
{
struct snd_pcsp *chip = platform_get_drvdata(dev);
alsa_card_pcsp_exit(chip);
pcspkr_input_remove(chip->input_dev);
platform_set_drvdata(dev, NULL);
return 0;
}
static void pcsp_stop_beep(struct snd_pcsp *chip)
{
unsigned long flags;
spin_lock_irqsave(&chip->substream_lock, flags);
if (!chip->playback_substream)
pcspkr_stop_sound();
spin_unlock_irqrestore(&chip->substream_lock, flags);
}
static int pcsp_suspend(struct platform_device *dev, pm_message_t state)
{
struct snd_pcsp *chip = platform_get_drvdata(dev);
pcsp_stop_beep(chip);
snd_pcm_suspend_all(chip->pcm);
return 0;
}
static void pcsp_shutdown(struct platform_device *dev)
{
struct snd_pcsp *chip = platform_get_drvdata(dev);
pcsp_stop_beep(chip);
}
static struct platform_driver pcsp_platform_driver = {
.driver = {
.name = "pcspkr",
.owner = THIS_MODULE,
},
.probe = pcsp_probe,
.remove = __devexit_p(pcsp_remove),
.suspend = pcsp_suspend,
.shutdown = pcsp_shutdown,
};
static int __init pcsp_init(void)
{
return platform_driver_register(&pcsp_platform_driver);
}
static void __exit pcsp_exit(void)
{
platform_driver_unregister(&pcsp_platform_driver);
}
module_init(pcsp_init);
module_exit(pcsp_exit);

82
sound/drivers/pcsp/pcsp.h Normal file
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@ -0,0 +1,82 @@
/*
* PC-Speaker driver for Linux
*
* Copyright (C) 1993-1997 Michael Beck
* Copyright (C) 1997-2001 David Woodhouse
* Copyright (C) 2001-2008 Stas Sergeev
*/
#ifndef __PCSP_H__
#define __PCSP_H__
#include <linux/hrtimer.h>
#if defined(CONFIG_MIPS) || defined(CONFIG_X86)
/* Use the global PIT lock ! */
#include <asm/i8253.h>
#else
#include <asm/8253pit.h>
static DEFINE_SPINLOCK(i8253_lock);
#endif
#define PCSP_SOUND_VERSION 0x400 /* read 4.00 */
#define PCSP_DEBUG 0
/* default timer freq for PC-Speaker: 18643 Hz */
#define DIV_18KHZ 64
#define MAX_DIV DIV_18KHZ
#define CUR_DIV() (MAX_DIV >> chip->treble)
#define PCSP_MAX_TREBLE 1
/* unfortunately, with hrtimers 37KHz does not work very well :( */
#define PCSP_DEFAULT_TREBLE 0
#define MIN_DIV (MAX_DIV >> PCSP_MAX_TREBLE)
/* wild guess */
#define PCSP_MIN_LPJ 1000000
#define PCSP_DEFAULT_SDIV (DIV_18KHZ >> 1)
#define PCSP_DEFAULT_SRATE (PIT_TICK_RATE / PCSP_DEFAULT_SDIV)
#define PCSP_INDEX_INC() (1 << (PCSP_MAX_TREBLE - chip->treble))
#define PCSP_RATE() (PIT_TICK_RATE / CUR_DIV())
#define PCSP_MIN_RATE__1 MAX_DIV/PIT_TICK_RATE
#define PCSP_MAX_RATE__1 MIN_DIV/PIT_TICK_RATE
#define PCSP_MAX_PERIOD_NS (1000000000ULL * PCSP_MIN_RATE__1)
#define PCSP_MIN_PERIOD_NS (1000000000ULL * PCSP_MAX_RATE__1)
#define PCSP_CALC_NS(div) ({ \
u64 __val = 1000000000ULL * (div); \
do_div(__val, PIT_TICK_RATE); \
__val; \
})
#define PCSP_PERIOD_NS() PCSP_CALC_NS(CUR_DIV())
#define PCSP_MAX_PERIOD_SIZE (64*1024)
#define PCSP_MAX_PERIODS 512
#define PCSP_BUFFER_SIZE (128*1024)
struct snd_pcsp {
struct snd_card *card;
struct snd_pcm *pcm;
struct input_dev *input_dev;
struct hrtimer timer;
unsigned short port, irq, dma;
spinlock_t substream_lock;
struct snd_pcm_substream *playback_substream;
size_t playback_ptr;
size_t period_ptr;
atomic_t timer_active;
int thalf;
u64 ns_rem;
unsigned char val61;
int enable;
int max_treble;
int treble;
int pcspkr;
};
extern struct snd_pcsp pcsp_chip;
extern enum hrtimer_restart pcsp_do_timer(struct hrtimer *handle);
extern int snd_pcsp_new_pcm(struct snd_pcsp *chip);
extern int snd_pcsp_new_mixer(struct snd_pcsp *chip);
#endif

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@ -0,0 +1,116 @@
/*
* PC Speaker beeper driver for Linux
*
* Copyright (c) 2002 Vojtech Pavlik
* Copyright (c) 1992 Orest Zborowski
*
*/
/*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as published by
* the Free Software Foundation
*/
#include <linux/init.h>
#include <linux/input.h>
#include <asm/io.h>
#include "pcsp.h"
static void pcspkr_do_sound(unsigned int count)
{
unsigned long flags;
spin_lock_irqsave(&i8253_lock, flags);
if (count) {
/* enable counter 2 */
outb_p(inb_p(0x61) | 3, 0x61);
/* set command for counter 2, 2 byte write */
outb_p(0xB6, 0x43);
/* select desired HZ */
outb_p(count & 0xff, 0x42);
outb((count >> 8) & 0xff, 0x42);
} else {
/* disable counter 2 */
outb(inb_p(0x61) & 0xFC, 0x61);
}
spin_unlock_irqrestore(&i8253_lock, flags);
}
void pcspkr_stop_sound(void)
{
pcspkr_do_sound(0);
}
static int pcspkr_input_event(struct input_dev *dev, unsigned int type,
unsigned int code, int value)
{
unsigned int count = 0;
if (atomic_read(&pcsp_chip.timer_active) || !pcsp_chip.pcspkr)
return 0;
switch (type) {
case EV_SND:
switch (code) {
case SND_BELL:
if (value)
value = 1000;
case SND_TONE:
break;
default:
return -1;
}
break;
default:
return -1;
}
if (value > 20 && value < 32767)
count = PIT_TICK_RATE / value;
pcspkr_do_sound(count);
return 0;
}
int __devinit pcspkr_input_init(struct input_dev **rdev, struct device *dev)
{
int err;
struct input_dev *input_dev = input_allocate_device();
if (!input_dev)
return -ENOMEM;
input_dev->name = "PC Speaker";
input_dev->phys = "isa0061/input0";
input_dev->id.bustype = BUS_ISA;
input_dev->id.vendor = 0x001f;
input_dev->id.product = 0x0001;
input_dev->id.version = 0x0100;
input_dev->dev.parent = dev;
input_dev->evbit[0] = BIT(EV_SND);
input_dev->sndbit[0] = BIT(SND_BELL) | BIT(SND_TONE);
input_dev->event = pcspkr_input_event;
err = input_register_device(input_dev);
if (err) {
input_free_device(input_dev);
return err;
}
*rdev = input_dev;
return 0;
}
int pcspkr_input_remove(struct input_dev *dev)
{
pcspkr_stop_sound();
input_unregister_device(dev); /* this also does kfree() */
return 0;
}

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@ -0,0 +1,14 @@
/*
* PC-Speaker driver for Linux
*
* Copyright (C) 2001-2008 Stas Sergeev
*/
#ifndef __PCSP_INPUT_H__
#define __PCSP_INPUT_H__
int __devinit pcspkr_input_init(struct input_dev **rdev, struct device *dev);
int pcspkr_input_remove(struct input_dev *dev);
void pcspkr_stop_sound(void);
#endif

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@ -0,0 +1,347 @@
/*
* 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/moduleparam.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <linux/interrupt.h>
#include <asm/io.h>
#include <asm/i8253.h>
#include "pcsp.h"
static int 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
static void pcsp_start_timer(unsigned long dummy)
{
hrtimer_start(&pcsp_chip.timer, ktime_set(0, 0), HRTIMER_MODE_REL);
}
/*
* We need the hrtimer_start as a tasklet to avoid
* the nasty locking problem. :(
* The problem:
* - The timer handler is called with the cpu_base->lock
* already held by hrtimer code.
* - snd_pcm_period_elapsed() takes the
* substream->self_group.lock.
* So far so good.
* But the snd_pcsp_trigger() is called with the
* substream->self_group.lock held, and it calls
* hrtimer_start(), which takes the cpu_base->lock.
* You see the problem. We have the code pathes
* which take two locks in a reverse order. This
* can deadlock and the lock validator complains.
* The only solution I could find was to move the
* hrtimer_start() into a tasklet. -stsp
*/
DECLARE_TASKLET(pcsp_start_timer_tasklet, pcsp_start_timer, 0);
enum hrtimer_restart pcsp_do_timer(struct hrtimer *handle)
{
unsigned long flags;
unsigned char timer_cnt, val;
int fmt_size, periods_elapsed;
u64 ns;
size_t period_bytes, buffer_bytes;
struct snd_pcm_substream *substream;
struct snd_pcm_runtime *runtime;
struct snd_pcsp *chip = container_of(handle, struct snd_pcsp, timer);
if (chip->thalf) {
outb(chip->val61, 0x61);
chip->thalf = 0;
if (!atomic_read(&chip->timer_active))
return HRTIMER_NORESTART;
hrtimer_forward(&chip->timer, chip->timer.expires,
ktime_set(0, chip->ns_rem));
return HRTIMER_RESTART;
}
/* hrtimer calls us from both hardirq and softirq contexts,
* so irqsave :( */
spin_lock_irqsave(&chip->substream_lock, flags);
/* Takashi Iwai says regarding this extra lock:
If the irq handler handles some data on the DMA buffer, it should
do snd_pcm_stream_lock().
That protects basically against all races among PCM callbacks, yes.
However, there are two remaining issues:
1. The substream pointer you try to lock isn't protected _before_
this lock yet.
2. snd_pcm_period_elapsed() itself acquires the lock.
The requirement of another lock is because of 1. When you get
chip->playback_substream, it's not protected.
Keeping this lock while snd_pcm_period_elapsed() assures the substream
is still protected (at least, not released). And the other status is
handled properly inside snd_pcm_stream_lock() in
snd_pcm_period_elapsed().
*/
if (!chip->playback_substream)
goto exit_nr_unlock1;
substream = chip->playback_substream;
snd_pcm_stream_lock(substream);
if (!atomic_read(&chip->timer_active))
goto exit_nr_unlock2;
runtime = substream->runtime;
fmt_size = snd_pcm_format_physical_width(runtime->format) >> 3;
/* assume it is mono! */
val = runtime->dma_area[chip->playback_ptr + fmt_size - 1];
if (snd_pcm_format_signed(runtime->format))
val ^= 0x80;
timer_cnt = val * CUR_DIV() / 256;
if (timer_cnt && chip->enable) {
spin_lock(&i8253_lock);
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;
}
spin_unlock(&i8253_lock);
}
period_bytes = snd_pcm_lib_period_bytes(substream);
buffer_bytes = snd_pcm_lib_buffer_bytes(substream);
chip->playback_ptr += PCSP_INDEX_INC() * fmt_size;
periods_elapsed = chip->playback_ptr - chip->period_ptr;
if (periods_elapsed < 0) {
printk(KERN_WARNING "PCSP: playback_ptr inconsistent "
"(%zi %zi %zi)\n",
chip->playback_ptr, period_bytes, buffer_bytes);
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;
snd_pcm_stream_unlock(substream);
if (periods_elapsed) {
snd_pcm_period_elapsed(substream);
chip->period_ptr += periods_elapsed * period_bytes;
chip->period_ptr %= buffer_bytes;
}
spin_unlock_irqrestore(&chip->substream_lock, flags);
if (!atomic_read(&chip->timer_active))
return HRTIMER_NORESTART;
chip->ns_rem = PCSP_PERIOD_NS();
ns = (chip->thalf ? PCSP_CALC_NS(timer_cnt) : chip->ns_rem);
chip->ns_rem -= ns;
hrtimer_forward(&chip->timer, chip->timer.expires, ktime_set(0, ns));
return HRTIMER_RESTART;
exit_nr_unlock2:
snd_pcm_stream_unlock(substream);
exit_nr_unlock1:
spin_unlock_irqrestore(&chip->substream_lock, flags);
return HRTIMER_NORESTART;
}
static void 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;
}
spin_lock(&i8253_lock);
chip->val61 = inb(0x61) | 0x03;
outb_p(0x92, 0x43); /* binary, mode 1, LSB only, ch 2 */
spin_unlock(&i8253_lock);
atomic_set(&chip->timer_active, 1);
chip->thalf = 0;
tasklet_schedule(&pcsp_start_timer_tasklet);
}
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);
spin_lock(&i8253_lock);
/* restore the timer */
outb_p(0xb6, 0x43); /* binary, mode 3, LSB/MSB, ch 2 */
outb(chip->val61 & 0xFC, 0x61);
spin_unlock(&i8253_lock);
}
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
if (atomic_read(&chip->timer_active)) {
printk(KERN_ERR "PCSP: timer still active\n");
pcsp_stop_playing(chip);
}
spin_lock_irq(&chip->substream_lock);
chip->playback_substream = NULL;
spin_unlock_irq(&chip->substream_lock);
return 0;
}
static int snd_pcsp_playback_hw_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *hw_params)
{
int err;
err = snd_pcm_lib_malloc_pages(substream,
params_buffer_bytes(hw_params));
if (err < 0)
return err;
return 0;
}
static int snd_pcsp_playback_hw_free(struct snd_pcm_substream *substream)
{
#if PCSP_DEBUG
printk(KERN_INFO "PCSP: hw_free called\n");
#endif
return snd_pcm_lib_free_pages(substream);
}
static int snd_pcsp_playback_prepare(struct snd_pcm_substream *substream)
{
struct snd_pcsp *chip = snd_pcm_substream_chip(substream);
#if PCSP_DEBUG
printk(KERN_INFO "PCSP: prepare called, "
"size=%zi psize=%zi f=%zi f1=%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);
#endif
chip->playback_ptr = 0;
chip->period_ptr = 0;
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:
pcsp_start_playing(chip);
break;
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);
return bytes_to_frames(substream->runtime, chip->playback_ptr);
}
static 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 struct snd_pcm_ops snd_pcsp_playback_ops = {
.open = snd_pcsp_playback_open,
.close = snd_pcsp_playback_close,
.ioctl = snd_pcm_lib_ioctl,
.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 __devinit 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_lib_preallocate_pages_for_all(chip->pcm,
SNDRV_DMA_TYPE_CONTINUOUS,
snd_dma_continuous_data
(GFP_KERNEL), PCSP_BUFFER_SIZE,
PCSP_BUFFER_SIZE);
return 0;
}

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@ -0,0 +1,143 @@
/*
* PC-Speaker driver for Linux
*
* Mixer implementation.
* Copyright (C) 2001-2008 Stas Sergeev
*/
#include <sound/core.h>
#include <sound/control.h>
#include "pcsp.h"
static int pcsp_enable_info(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_info *uinfo)
{
uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN;
uinfo->count = 1;
uinfo->value.integer.min = 0;
uinfo->value.integer.max = 1;
return 0;
}
static int pcsp_enable_get(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_value *ucontrol)
{
struct snd_pcsp *chip = snd_kcontrol_chip(kcontrol);
ucontrol->value.integer.value[0] = chip->enable;
return 0;
}
static int pcsp_enable_put(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_value *ucontrol)
{
struct snd_pcsp *chip = snd_kcontrol_chip(kcontrol);
int changed = 0;
int enab = ucontrol->value.integer.value[0];
if (enab != chip->enable) {
chip->enable = enab;
changed = 1;
}
return changed;
}
static int pcsp_treble_info(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_info *uinfo)
{
struct snd_pcsp *chip = snd_kcontrol_chip(kcontrol);
uinfo->type = SNDRV_CTL_ELEM_TYPE_ENUMERATED;
uinfo->count = 1;
uinfo->value.enumerated.items = chip->max_treble + 1;
if (uinfo->value.enumerated.item > chip->max_treble)
uinfo->value.enumerated.item = chip->max_treble;
sprintf(uinfo->value.enumerated.name, "%d", PCSP_RATE());
return 0;
}
static int pcsp_treble_get(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_value *ucontrol)
{
struct snd_pcsp *chip = snd_kcontrol_chip(kcontrol);
ucontrol->value.enumerated.item[0] = chip->treble;
return 0;
}
static int pcsp_treble_put(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_value *ucontrol)
{
struct snd_pcsp *chip = snd_kcontrol_chip(kcontrol);
int changed = 0;
int treble = ucontrol->value.enumerated.item[0];
if (treble != chip->treble) {
chip->treble = treble;
#if PCSP_DEBUG
printk(KERN_INFO "PCSP: rate set to %i\n", PCSP_RATE());
#endif
changed = 1;
}
return changed;
}
static int pcsp_pcspkr_info(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_info *uinfo)
{
uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN;
uinfo->count = 1;
uinfo->value.integer.min = 0;
uinfo->value.integer.max = 1;
return 0;
}
static int pcsp_pcspkr_get(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_value *ucontrol)
{
struct snd_pcsp *chip = snd_kcontrol_chip(kcontrol);
ucontrol->value.integer.value[0] = chip->pcspkr;
return 0;
}
static int pcsp_pcspkr_put(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_value *ucontrol)
{
struct snd_pcsp *chip = snd_kcontrol_chip(kcontrol);
int changed = 0;
int spkr = ucontrol->value.integer.value[0];
if (spkr != chip->pcspkr) {
chip->pcspkr = spkr;
changed = 1;
}
return changed;
}
#define PCSP_MIXER_CONTROL(ctl_type, ctl_name) \
{ \
.iface = SNDRV_CTL_ELEM_IFACE_MIXER, \
.name = ctl_name, \
.info = pcsp_##ctl_type##_info, \
.get = pcsp_##ctl_type##_get, \
.put = pcsp_##ctl_type##_put, \
}
static struct snd_kcontrol_new __devinitdata snd_pcsp_controls[] = {
PCSP_MIXER_CONTROL(enable, "Master Playback Switch"),
PCSP_MIXER_CONTROL(treble, "BaseFRQ Playback Volume"),
PCSP_MIXER_CONTROL(pcspkr, "PC Speaker Playback Switch"),
};
int __devinit snd_pcsp_new_mixer(struct snd_pcsp *chip)
{
struct snd_card *card = chip->card;
int i, err;
for (i = 0; i < ARRAY_SIZE(snd_pcsp_controls); i++) {
err = snd_ctl_add(card,
snd_ctl_new1(snd_pcsp_controls + i,
chip));
if (err < 0)
return err;
}
strcpy(card->mixername, "PC-Speaker");
return 0;
}