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linux-next/sound/oss/ac97.c
Linus Torvalds 1da177e4c3 Linux-2.6.12-rc2 
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!
2005-04-16 15:20:36 -07:00

453 lines
11 KiB
C
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#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include "ac97.h"
/* Flag for mono controls. */
#define MO 0
/* And for stereo. */
#define ST 1
/* Whether or not the bits in the channel are inverted. */
#define INV 1
#define NINV 0
static struct ac97_chn_desc {
int ac97_regnum;
int oss_channel;
int maxval;
int is_stereo;
int oss_mask;
int recordNum;
u16 regmask;
int is_inverted;
} mixerRegs[] = {
{ AC97_MASTER_VOL_STEREO, SOUND_MIXER_VOLUME, 0x3f, ST, SOUND_MASK_VOLUME, 5, 0x0000, INV },
{ AC97_MASTER_VOL_MONO, SOUND_MIXER_PHONEOUT, 0x3f, MO, SOUND_MASK_PHONEOUT, 6, 0x0000, INV },
{ AC97_MASTER_TONE, SOUND_MIXER_TREBLE, 0x0f, MO, SOUND_MASK_TREBLE, -1, 0x00ff, INV },
{ AC97_MASTER_TONE, SOUND_MIXER_BASS, 0x0f, MO, SOUND_MASK_BASS, -1, 0xff00, INV },
{ AC97_PCBEEP_VOL, SOUND_MIXER_SPEAKER, 0x0f, MO, SOUND_MASK_SPEAKER, -1, 0x001e, INV },
{ AC97_PHONE_VOL, SOUND_MIXER_PHONEIN, 0x1f, MO, SOUND_MASK_PHONEIN, 7, 0x0000, INV },
{ AC97_MIC_VOL, SOUND_MIXER_MIC, 0x1f, MO, SOUND_MASK_MIC, 0, 0x0000, INV },
{ AC97_LINEIN_VOL, SOUND_MIXER_LINE, 0x1f, ST, SOUND_MASK_LINE, 4, 0x0000, INV },
{ AC97_CD_VOL, SOUND_MIXER_CD, 0x1f, ST, SOUND_MASK_CD, 1, 0x0000, INV },
{ AC97_VIDEO_VOL, SOUND_MIXER_VIDEO, 0x1f, ST, SOUND_MASK_VIDEO, 2, 0x0000, INV },
{ AC97_AUX_VOL, SOUND_MIXER_LINE1, 0x1f, ST, SOUND_MASK_LINE1, 3, 0x0000, INV },
{ AC97_PCMOUT_VOL, SOUND_MIXER_PCM, 0x1f, ST, SOUND_MASK_PCM, -1, 0x0000, INV },
{ AC97_RECORD_GAIN, SOUND_MIXER_IGAIN, 0x0f, ST, SOUND_MASK_IGAIN, -1, 0x0000, NINV },
{ -1, -1, 0xff, 0, 0, -1, 0x0000, 0 },
};
static struct ac97_chn_desc *
ac97_find_chndesc (struct ac97_hwint *dev, int oss_channel)
{
int x;
for (x = 0; mixerRegs[x].oss_channel != -1; x++) {
if (mixerRegs[x].oss_channel == oss_channel)
return mixerRegs + x;
}
return NULL;
}
static inline int
ac97_is_valid_channel (struct ac97_hwint *dev, struct ac97_chn_desc *chn)
{
return (dev->last_written_mixer_values[chn->ac97_regnum / 2]
!= AC97_REG_UNSUPPORTED);
}
int
ac97_init (struct ac97_hwint *dev)
{
int x;
int reg0;
/* Clear out the arrays of cached values. */
for (x = 0; x < AC97_REG_CNT; x++)
dev->last_written_mixer_values[x] = AC97_REGVAL_UNKNOWN;
for (x = 0; x < SOUND_MIXER_NRDEVICES; x++)
dev->last_written_OSS_values[x] = AC97_REGVAL_UNKNOWN;
/* Clear the device masks. */
dev->mixer_devmask = 0;
dev->mixer_stereomask = 0;
dev->mixer_recmask = 0;
/* ??? Do a "standard reset" via register 0? */
/* Hardware-dependent reset. */
if (dev->reset_device (dev))
return -1;
/* Check the mixer device capabilities. */
reg0 = dev->read_reg (dev, AC97_RESET);
if (reg0 < 0)
return -1;
/* Check for support for treble/bass controls. */
if (! (reg0 & 4)) {
dev->last_written_mixer_values[AC97_MASTER_TONE / 2]
= AC97_REG_UNSUPPORTED;
}
/* ??? There may be other tests here? */
/* Fill in the device masks. */
for (x = 0; mixerRegs[x].ac97_regnum != -1; x++) {
if (ac97_is_valid_channel (dev, mixerRegs + x)) {
dev->mixer_devmask |= mixerRegs[x].oss_mask;
if (mixerRegs[x].is_stereo)
dev->mixer_stereomask |= mixerRegs[x].oss_mask;
if (mixerRegs[x].recordNum != -1)
dev->mixer_recmask |= mixerRegs[x].oss_mask;
}
}
return 0;
}
/* Reset the mixer to the currently saved settings. */
int
ac97_reset (struct ac97_hwint *dev)
{
int x;
if (dev->reset_device (dev))
return -1;
/* Now set the registers back to their last-written values. */
for (x = 0; mixerRegs[x].ac97_regnum != -1; x++) {
int regnum = mixerRegs[x].ac97_regnum;
int value = dev->last_written_mixer_values [regnum / 2];
if (value >= 0)
ac97_put_register (dev, regnum, value);
}
return 0;
}
/* Return the contents of register REG; use the cache if the value in it
is valid. Returns a negative error code on failure. */
static int
ac97_get_register (struct ac97_hwint *dev, u8 reg)
{
if (reg > 127 || (reg & 1))
return -EINVAL;
/* See if it's in the cache, or if it's just plain invalid. */
switch (dev->last_written_mixer_values[reg / 2]) {
case AC97_REG_UNSUPPORTED:
return -EINVAL;
break;
case AC97_REGVAL_UNKNOWN:
dev->last_written_mixer_values[reg / 2] = dev->read_reg (dev, reg);
break;
default:
break;
}
return dev->last_written_mixer_values[reg / 2];
}
/* Write VALUE to AC97 register REG, and cache its value in the last-written
cache. Returns a negative error code on failure, or 0 on success. */
int
ac97_put_register (struct ac97_hwint *dev, u8 reg, u16 value)
{
if (reg > 127 || (reg & 1))
return -EINVAL;
if (dev->last_written_mixer_values[reg / 2] == AC97_REG_UNSUPPORTED)
return -EINVAL;
else {
int res = dev->write_reg (dev, reg, value);
if (res >= 0) {
dev->last_written_mixer_values[reg / 2] = value;
return 0;
}
else
return res;
}
}
/* Scale VALUE (a value fro 0 to MAXVAL) to a value from 0-100. If
IS_STEREO is set, VALUE is a stereo value; the left channel value
is in the lower 8 bits, and the right channel value is in the upper
8 bits.
A negative error code is returned on failure, or the unsigned
scaled value on success. */
static int
ac97_scale_to_oss_val (int value, int maxval, int is_stereo, int inv)
{
/* Muted? */
if (value & AC97_MUTE)
return 0;
if (is_stereo)
return (ac97_scale_to_oss_val (value & 255, maxval, 0, inv) << 8)
| (ac97_scale_to_oss_val ((value >> 8) & 255, maxval, 0, inv) << 0);
else {
int i;
/* Inverted. */
if (inv)
value = maxval - value;
i = (value * 100 + (maxval / 2)) / maxval;
if (i > 100)
i = 100;
if (i < 0)
i = 0;
return i;
}
}
static int
ac97_scale_from_oss_val (int value, int maxval, int is_stereo, int inv)
{
if (is_stereo)
return (ac97_scale_from_oss_val (value & 255, maxval, 0, inv) << 8)
| (ac97_scale_from_oss_val ((value >> 8) & 255, maxval, 0, inv) << 0);
else {
int i = ((value & 255) * maxval + 50) / 100;
if (inv)
i = maxval - i;
if (i < 0)
i = 0;
if (i > maxval)
i = maxval;
return i;
}
}
static int
ac97_set_mixer (struct ac97_hwint *dev, int oss_channel, u16 oss_value)
{
int scaled_value;
struct ac97_chn_desc *channel = ac97_find_chndesc (dev, oss_channel);
int result;
if (channel == NULL)
return -ENODEV;
if (! ac97_is_valid_channel (dev, channel))
return -ENODEV;
scaled_value = ac97_scale_from_oss_val (oss_value, channel->maxval,
channel->is_stereo,
channel->is_inverted);
if (scaled_value < 0)
return scaled_value;
if (channel->regmask != 0) {
int mv;
int oldval = ac97_get_register (dev, channel->ac97_regnum);
if (oldval < 0)
return oldval;
for (mv = channel->regmask; ! (mv & 1); mv >>= 1)
scaled_value <<= 1;
scaled_value &= channel->regmask;
scaled_value |= (oldval & ~channel->regmask);
}
result = ac97_put_register (dev, channel->ac97_regnum, scaled_value);
if (result == 0)
dev->last_written_OSS_values[oss_channel] = oss_value;
return result;
}
static int
ac97_get_mixer_scaled (struct ac97_hwint *dev, int oss_channel)
{
struct ac97_chn_desc *channel = ac97_find_chndesc (dev, oss_channel);
int regval;
if (channel == NULL)
return -ENODEV;
if (! ac97_is_valid_channel (dev, channel))
return -ENODEV;
regval = ac97_get_register (dev, channel->ac97_regnum);
if (regval < 0)
return regval;
if (channel->regmask != 0) {
int mv;
regval &= channel->regmask;
for (mv = channel->regmask; ! (mv & 1); mv >>= 1)
regval >>= 1;
}
return ac97_scale_to_oss_val (regval, channel->maxval,
channel->is_stereo,
channel->is_inverted);
}
static int
ac97_get_recmask (struct ac97_hwint *dev)
{
int recReg = ac97_get_register (dev, AC97_RECORD_SELECT);
if (recReg < 0)
return recReg;
else {
int x;
for (x = 0; mixerRegs[x].ac97_regnum >= 0; x++) {
if (mixerRegs[x].recordNum == (recReg & 7))
return mixerRegs[x].oss_mask;
}
return -ENODEV;
}
}
static int
ac97_set_recmask (struct ac97_hwint *dev, int oss_recmask)
{
int x;
if (oss_recmask == 0)
oss_recmask = SOUND_MIXER_MIC;
for (x = 0; mixerRegs[x].ac97_regnum >= 0; x++) {
if ((mixerRegs[x].recordNum >= 0)
&& (oss_recmask & mixerRegs[x].oss_mask))
break;
}
if (mixerRegs[x].ac97_regnum < 0)
return -ENODEV;
else {
int regval = (mixerRegs[x].recordNum << 8) | mixerRegs[x].recordNum;
int res = ac97_put_register (dev, AC97_RECORD_SELECT, regval);
if (res == 0)
return ac97_get_recmask (dev);
else
return res;
}
}
/* Set the mixer DEV to the list of values in VALUE_LIST. Return 0 on
success, or a negative error code. */
int
ac97_set_values (struct ac97_hwint *dev,
struct ac97_mixer_value_list *value_list)
{
int x;
for (x = 0; value_list[x].oss_channel != -1; x++) {
int chnum = value_list[x].oss_channel;
struct ac97_chn_desc *chent = ac97_find_chndesc (dev, chnum);
if (chent != NULL) {
u16 val;
int res;
if (chent->is_stereo)
val = (value_list[x].value.stereo.right << 8)
| value_list[x].value.stereo.left;
else {
/* We do this so the returned value looks OK in the
mixer app. It's not necessary otherwise. */
val = (value_list[x].value.mono << 8)
| value_list[x].value.mono;
}
res = ac97_set_mixer (dev, chnum, val);
if (res < 0)
return res;
}
else
return -ENODEV;
}
return 0;
}
int
ac97_mixer_ioctl (struct ac97_hwint *dev, unsigned int cmd, void __user *arg)
{
int ret;
switch (cmd) {
case SOUND_MIXER_READ_RECSRC:
ret = ac97_get_recmask (dev);
break;
case SOUND_MIXER_WRITE_RECSRC:
{
if (get_user (ret, (int __user *) arg))
ret = -EFAULT;
else
ret = ac97_set_recmask (dev, ret);
}
break;
case SOUND_MIXER_READ_CAPS:
ret = SOUND_CAP_EXCL_INPUT;
break;
case SOUND_MIXER_READ_DEVMASK:
ret = dev->mixer_devmask;
break;
case SOUND_MIXER_READ_RECMASK:
ret = dev->mixer_recmask;
break;
case SOUND_MIXER_READ_STEREODEVS:
ret = dev->mixer_stereomask;
break;
default:
/* Read or write request. */
ret = -EINVAL;
if (_IOC_TYPE (cmd) == 'M') {
int dir = _SIOC_DIR (cmd);
int channel = _IOC_NR (cmd);
if (channel >= 0 && channel < SOUND_MIXER_NRDEVICES) {
ret = 0;
if (dir & _SIOC_WRITE) {
int val;
if (get_user (val, (int __user *) arg) == 0)
ret = ac97_set_mixer (dev, channel, val);
else
ret = -EFAULT;
}
if (ret >= 0 && (dir & _SIOC_READ)) {
if (dev->last_written_OSS_values[channel]
== AC97_REGVAL_UNKNOWN)
dev->last_written_OSS_values[channel]
= ac97_get_mixer_scaled (dev, channel);
ret = dev->last_written_OSS_values[channel];
}
}
}
break;
}
if (ret < 0)
return ret;
else
return put_user(ret, (int __user *) arg);
}
EXPORT_SYMBOL(ac97_init);
EXPORT_SYMBOL(ac97_set_values);
EXPORT_SYMBOL(ac97_put_register);
EXPORT_SYMBOL(ac97_mixer_ioctl);
EXPORT_SYMBOL(ac97_reset);
MODULE_LICENSE("GPL");
/*
* Local variables:
* c-basic-offset: 4
* End:
*/
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