Revision fc3501d411d34823fb9be248a95a0c44f945866f authored by Sven Wegener on 11 February 2009, 21:04:23 UTC, committed by Linus Torvalds on 11 February 2009, 22:25:35 UTC
We need to pass an unsigned long as the minimum, because it gets casted to an unsigned long in the sysctl handler. If we pass an int, we'll access four more bytes on 64bit arches, resulting in a random minimum value. [rientjes@google.com: fix type of `old_bytes'] Signed-off-by: Sven Wegener <sven.wegener@stealer.net> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Dave Chinner <david@fromorbit.com> Cc: Christoph Lameter <cl@linux-foundation.org> Cc: David Rientjes <rientjes@google.com> Signed-off-by: David Rientjes <rientjes@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
1 parent 35887b1
pas2_pcm.c
/*
* pas2_pcm.c Audio routines for PAS16
*
*
* Copyright (C) by Hannu Savolainen 1993-1997
*
* OSS/Free for Linux is distributed under the GNU GENERAL PUBLIC LICENSE (GPL)
* Version 2 (June 1991). See the "COPYING" file distributed with this software
* for more info.
*
*
* Thomas Sailer : ioctl code reworked (vmalloc/vfree removed)
* Alan Cox : Swatted a double allocation of device bug. Made a few
* more things module options.
* Bartlomiej Zolnierkiewicz : Added __init to pas_pcm_init()
*/
#include <linux/init.h>
#include <linux/spinlock.h>
#include <asm/timex.h>
#include "sound_config.h"
#include "pas2.h"
#ifndef DEB
#define DEB(WHAT)
#endif
#define PAS_PCM_INTRBITS (0x08)
/*
* Sample buffer timer interrupt enable
*/
#define PCM_NON 0
#define PCM_DAC 1
#define PCM_ADC 2
static unsigned long pcm_speed; /* sampling rate */
static unsigned char pcm_channels = 1; /* channels (1 or 2) */
static unsigned char pcm_bits = 8; /* bits/sample (8 or 16) */
static unsigned char pcm_filter; /* filter FLAG */
static unsigned char pcm_mode = PCM_NON;
static unsigned long pcm_count;
static unsigned short pcm_bitsok = 8; /* mask of OK bits */
static int pcm_busy;
int pas_audiodev = -1;
static int open_mode;
extern spinlock_t pas_lock;
static int pcm_set_speed(int arg)
{
int foo, tmp;
unsigned long flags;
if (arg == 0)
return pcm_speed;
if (arg > 44100)
arg = 44100;
if (arg < 5000)
arg = 5000;
if (pcm_channels & 2)
{
foo = ((CLOCK_TICK_RATE / 2) + (arg / 2)) / arg;
arg = ((CLOCK_TICK_RATE / 2) + (foo / 2)) / foo;
}
else
{
foo = (CLOCK_TICK_RATE + (arg / 2)) / arg;
arg = (CLOCK_TICK_RATE + (foo / 2)) / foo;
}
pcm_speed = arg;
tmp = pas_read(0x0B8A);
/*
* Set anti-aliasing filters according to sample rate. You really *NEED*
* to enable this feature for all normal recording unless you want to
* experiment with aliasing effects.
* These filters apply to the selected "recording" source.
* I (pfw) don't know the encoding of these 5 bits. The values shown
* come from the SDK found on ftp.uwp.edu:/pub/msdos/proaudio/.
*
* I cleared bit 5 of these values, since that bit controls the master
* mute flag. (Olav Wölfelschneider)
*
*/
#if !defined NO_AUTO_FILTER_SET
tmp &= 0xe0;
if (pcm_speed >= 2 * 17897)
tmp |= 0x01;
else if (pcm_speed >= 2 * 15909)
tmp |= 0x02;
else if (pcm_speed >= 2 * 11931)
tmp |= 0x09;
else if (pcm_speed >= 2 * 8948)
tmp |= 0x11;
else if (pcm_speed >= 2 * 5965)
tmp |= 0x19;
else if (pcm_speed >= 2 * 2982)
tmp |= 0x04;
pcm_filter = tmp;
#endif
spin_lock_irqsave(&pas_lock, flags);
pas_write(tmp & ~(0x40 | 0x80), 0x0B8A);
pas_write(0x00 | 0x30 | 0x04, 0x138B);
pas_write(foo & 0xff, 0x1388);
pas_write((foo >> 8) & 0xff, 0x1388);
pas_write(tmp, 0x0B8A);
spin_unlock_irqrestore(&pas_lock, flags);
return pcm_speed;
}
static int pcm_set_channels(int arg)
{
if ((arg != 1) && (arg != 2))
return pcm_channels;
if (arg != pcm_channels)
{
pas_write(pas_read(0xF8A) ^ 0x20, 0xF8A);
pcm_channels = arg;
pcm_set_speed(pcm_speed); /* The speed must be reinitialized */
}
return pcm_channels;
}
static int pcm_set_bits(int arg)
{
if (arg == 0)
return pcm_bits;
if ((arg & pcm_bitsok) != arg)
return pcm_bits;
if (arg != pcm_bits)
{
pas_write(pas_read(0x8389) ^ 0x04, 0x8389);
pcm_bits = arg;
}
return pcm_bits;
}
static int pas_audio_ioctl(int dev, unsigned int cmd, void __user *arg)
{
int val, ret;
int __user *p = arg;
DEB(printk("pas2_pcm.c: static int pas_audio_ioctl(unsigned int cmd = %X, unsigned int arg = %X)\n", cmd, arg));
switch (cmd)
{
case SOUND_PCM_WRITE_RATE:
if (get_user(val, p))
return -EFAULT;
ret = pcm_set_speed(val);
break;
case SOUND_PCM_READ_RATE:
ret = pcm_speed;
break;
case SNDCTL_DSP_STEREO:
if (get_user(val, p))
return -EFAULT;
ret = pcm_set_channels(val + 1) - 1;
break;
case SOUND_PCM_WRITE_CHANNELS:
if (get_user(val, p))
return -EFAULT;
ret = pcm_set_channels(val);
break;
case SOUND_PCM_READ_CHANNELS:
ret = pcm_channels;
break;
case SNDCTL_DSP_SETFMT:
if (get_user(val, p))
return -EFAULT;
ret = pcm_set_bits(val);
break;
case SOUND_PCM_READ_BITS:
ret = pcm_bits;
break;
default:
return -EINVAL;
}
return put_user(ret, p);
}
static void pas_audio_reset(int dev)
{
DEB(printk("pas2_pcm.c: static void pas_audio_reset(void)\n"));
pas_write(pas_read(0xF8A) & ~0x40, 0xF8A); /* Disable PCM */
}
static int pas_audio_open(int dev, int mode)
{
int err;
unsigned long flags;
DEB(printk("pas2_pcm.c: static int pas_audio_open(int mode = %X)\n", mode));
spin_lock_irqsave(&pas_lock, flags);
if (pcm_busy)
{
spin_unlock_irqrestore(&pas_lock, flags);
return -EBUSY;
}
pcm_busy = 1;
spin_unlock_irqrestore(&pas_lock, flags);
if ((err = pas_set_intr(PAS_PCM_INTRBITS)) < 0)
return err;
pcm_count = 0;
open_mode = mode;
return 0;
}
static void pas_audio_close(int dev)
{
unsigned long flags;
DEB(printk("pas2_pcm.c: static void pas_audio_close(void)\n"));
spin_lock_irqsave(&pas_lock, flags);
pas_audio_reset(dev);
pas_remove_intr(PAS_PCM_INTRBITS);
pcm_mode = PCM_NON;
pcm_busy = 0;
spin_unlock_irqrestore(&pas_lock, flags);
}
static void pas_audio_output_block(int dev, unsigned long buf, int count,
int intrflag)
{
unsigned long flags, cnt;
DEB(printk("pas2_pcm.c: static void pas_audio_output_block(char *buf = %P, int count = %X)\n", buf, count));
cnt = count;
if (audio_devs[dev]->dmap_out->dma > 3)
cnt >>= 1;
if (audio_devs[dev]->flags & DMA_AUTOMODE &&
intrflag &&
cnt == pcm_count)
return;
spin_lock_irqsave(&pas_lock, flags);
pas_write(pas_read(0xF8A) & ~0x40,
0xF8A);
/* DMAbuf_start_dma (dev, buf, count, DMA_MODE_WRITE); */
if (audio_devs[dev]->dmap_out->dma > 3)
count >>= 1;
if (count != pcm_count)
{
pas_write(pas_read(0x0B8A) & ~0x80, 0x0B8A);
pas_write(0x40 | 0x30 | 0x04, 0x138B);
pas_write(count & 0xff, 0x1389);
pas_write((count >> 8) & 0xff, 0x1389);
pas_write(pas_read(0x0B8A) | 0x80, 0x0B8A);
pcm_count = count;
}
pas_write(pas_read(0x0B8A) | 0x80 | 0x40, 0x0B8A);
#ifdef NO_TRIGGER
pas_write(pas_read(0xF8A) | 0x40 | 0x10, 0xF8A);
#endif
pcm_mode = PCM_DAC;
spin_unlock_irqrestore(&pas_lock, flags);
}
static void pas_audio_start_input(int dev, unsigned long buf, int count,
int intrflag)
{
unsigned long flags;
int cnt;
DEB(printk("pas2_pcm.c: static void pas_audio_start_input(char *buf = %P, int count = %X)\n", buf, count));
cnt = count;
if (audio_devs[dev]->dmap_out->dma > 3)
cnt >>= 1;
if (audio_devs[pas_audiodev]->flags & DMA_AUTOMODE &&
intrflag &&
cnt == pcm_count)
return;
spin_lock_irqsave(&pas_lock, flags);
/* DMAbuf_start_dma (dev, buf, count, DMA_MODE_READ); */
if (audio_devs[dev]->dmap_out->dma > 3)
count >>= 1;
if (count != pcm_count)
{
pas_write(pas_read(0x0B8A) & ~0x80, 0x0B8A);
pas_write(0x40 | 0x30 | 0x04, 0x138B);
pas_write(count & 0xff, 0x1389);
pas_write((count >> 8) & 0xff, 0x1389);
pas_write(pas_read(0x0B8A) | 0x80, 0x0B8A);
pcm_count = count;
}
pas_write(pas_read(0x0B8A) | 0x80 | 0x40, 0x0B8A);
#ifdef NO_TRIGGER
pas_write((pas_read(0xF8A) | 0x40) & ~0x10, 0xF8A);
#endif
pcm_mode = PCM_ADC;
spin_unlock_irqrestore(&pas_lock, flags);
}
#ifndef NO_TRIGGER
static void pas_audio_trigger(int dev, int state)
{
unsigned long flags;
spin_lock_irqsave(&pas_lock, flags);
state &= open_mode;
if (state & PCM_ENABLE_OUTPUT)
pas_write(pas_read(0xF8A) | 0x40 | 0x10, 0xF8A);
else if (state & PCM_ENABLE_INPUT)
pas_write((pas_read(0xF8A) | 0x40) & ~0x10, 0xF8A);
else
pas_write(pas_read(0xF8A) & ~0x40, 0xF8A);
spin_unlock_irqrestore(&pas_lock, flags);
}
#endif
static int pas_audio_prepare_for_input(int dev, int bsize, int bcount)
{
pas_audio_reset(dev);
return 0;
}
static int pas_audio_prepare_for_output(int dev, int bsize, int bcount)
{
pas_audio_reset(dev);
return 0;
}
static struct audio_driver pas_audio_driver =
{
.owner = THIS_MODULE,
.open = pas_audio_open,
.close = pas_audio_close,
.output_block = pas_audio_output_block,
.start_input = pas_audio_start_input,
.ioctl = pas_audio_ioctl,
.prepare_for_input = pas_audio_prepare_for_input,
.prepare_for_output = pas_audio_prepare_for_output,
.halt_io = pas_audio_reset,
.trigger = pas_audio_trigger
};
void __init pas_pcm_init(struct address_info *hw_config)
{
DEB(printk("pas2_pcm.c: long pas_pcm_init()\n"));
pcm_bitsok = 8;
if (pas_read(0xEF8B) & 0x08)
pcm_bitsok |= 16;
pcm_set_speed(DSP_DEFAULT_SPEED);
if ((pas_audiodev = sound_install_audiodrv(AUDIO_DRIVER_VERSION,
"Pro Audio Spectrum",
&pas_audio_driver,
sizeof(struct audio_driver),
DMA_AUTOMODE,
AFMT_U8 | AFMT_S16_LE,
NULL,
hw_config->dma,
hw_config->dma)) < 0)
printk(KERN_WARNING "PAS16: Too many PCM devices available\n");
}
void pas_pcm_interrupt(unsigned char status, int cause)
{
if (cause == 1)
{
/*
* Halt the PCM first. Otherwise we don't have time to start a new
* block before the PCM chip proceeds to the next sample
*/
if (!(audio_devs[pas_audiodev]->flags & DMA_AUTOMODE))
pas_write(pas_read(0xF8A) & ~0x40, 0xF8A);
switch (pcm_mode)
{
case PCM_DAC:
DMAbuf_outputintr(pas_audiodev, 1);
break;
case PCM_ADC:
DMAbuf_inputintr(pas_audiodev);
break;
default:
printk(KERN_WARNING "PAS: Unexpected PCM interrupt\n");
}
}
}
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