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