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diff --git a/sound/oss/ac97.h b/sound/oss/ac97.h
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+/*
+ * ac97.h
+ *
+ * definitions for the AC97, Intel's Audio Codec 97 Spec
+ * also includes support for a generic AC97 interface
+ */
+
+#ifndef _AC97_H_
+#define _AC97_H_
+#include "sound_config.h"
+#include "sound_calls.h"
+
+#define AC97_RESET 0x0000 //
+#define AC97_MASTER_VOL_STEREO 0x0002 // Line Out
+#define AC97_HEADPHONE_VOL 0x0004 //
+#define AC97_MASTER_VOL_MONO 0x0006 // TAD Output
+#define AC97_MASTER_TONE 0x0008 //
+#define AC97_PCBEEP_VOL 0x000a // none
+#define AC97_PHONE_VOL 0x000c // TAD Input (mono)
+#define AC97_MIC_VOL 0x000e // MIC Input (mono)
+#define AC97_LINEIN_VOL 0x0010 // Line Input (stereo)
+#define AC97_CD_VOL 0x0012 // CD Input (stereo)
+#define AC97_VIDEO_VOL 0x0014 // none
+#define AC97_AUX_VOL 0x0016 // Aux Input (stereo)
+#define AC97_PCMOUT_VOL 0x0018 // Wave Output (stereo)
+#define AC97_RECORD_SELECT 0x001a //
+#define AC97_RECORD_GAIN 0x001c
+#define AC97_RECORD_GAIN_MIC 0x001e
+#define AC97_GENERAL_PURPOSE 0x0020
+#define AC97_3D_CONTROL 0x0022
+#define AC97_MODEM_RATE 0x0024
+#define AC97_POWER_CONTROL 0x0026
+
+/* registers 0x0028 - 0x0058 are reserved */
+
+/* AC'97 2.0 */
+#define AC97_EXTENDED_ID 0x0028 /* Extended Audio ID */
+#define AC97_EXTENDED_STATUS 0x002A /* Extended Audio Status */
+#define AC97_PCM_FRONT_DAC_RATE 0x002C /* PCM Front DAC Rate */
+#define AC97_PCM_SURR_DAC_RATE 0x002E /* PCM Surround DAC Rate */
+#define AC97_PCM_LFE_DAC_RATE 0x0030 /* PCM LFE DAC Rate */
+#define AC97_PCM_LR_ADC_RATE 0x0032 /* PCM LR DAC Rate */
+#define AC97_PCM_MIC_ADC_RATE 0x0034 /* PCM MIC ADC Rate */
+#define AC97_CENTER_LFE_MASTER 0x0036 /* Center + LFE Master Volume */
+#define AC97_SURROUND_MASTER 0x0038 /* Surround (Rear) Master Volume */
+#define AC97_RESERVED_3A 0x003A /* Reserved */
+/* range 0x3c-0x58 - MODEM */
+
+/* registers 0x005a - 0x007a are vendor reserved */
+
+#define AC97_VENDOR_ID1 0x007c
+#define AC97_VENDOR_ID2 0x007e
+
+/* volume control bit defines */
+
+#define AC97_MUTE 0x8000
+#define AC97_MICBOOST 0x0040
+#define AC97_LEFTVOL 0x3f00
+#define AC97_RIGHTVOL 0x003f
+
+/* record mux defines */
+
+#define AC97_RECMUX_MIC 0x0000
+#define AC97_RECMUX_CD 0x0101
+#define AC97_RECMUX_VIDEO 0x0202 /* not used */
+#define AC97_RECMUX_AUX 0x0303
+#define AC97_RECMUX_LINE 0x0404
+#define AC97_RECMUX_STEREO_MIX 0x0505
+#define AC97_RECMUX_MONO_MIX 0x0606
+#define AC97_RECMUX_PHONE 0x0707
+
+
+/* general purpose register bit defines */
+
+#define AC97_GP_LPBK 0x0080 /* Loopback mode */
+#define AC97_GP_MS 0x0100 /* Mic Select 0=Mic1, 1=Mic2 */
+#define AC97_GP_MIX 0x0200 /* Mono output select 0=Mix, 1=Mic */
+#define AC97_GP_RLBK 0x0400 /* Remote Loopback - Modem line codec */
+#define AC97_GP_LLBK 0x0800 /* Local Loopback - Modem Line codec */
+#define AC97_GP_LD 0x1000 /* Loudness 1=on */
+#define AC97_GP_3D 0x2000 /* 3D Enhancement 1=on */
+#define AC97_GP_ST 0x4000 /* Stereo Enhancement 1=on */
+#define AC97_GP_POP 0x8000 /* Pcm Out Path, 0=pre 3D, 1=post 3D */
+
+
+/* powerdown control and status bit defines */
+
+/* status */
+#define AC97_PWR_MDM 0x0010 /* Modem section ready */
+#define AC97_PWR_REF 0x0008 /* Vref nominal */
+#define AC97_PWR_ANL 0x0004 /* Analog section ready */
+#define AC97_PWR_DAC 0x0002 /* DAC section ready */
+#define AC97_PWR_ADC 0x0001 /* ADC section ready */
+
+/* control */
+#define AC97_PWR_PR0 0x0100 /* ADC and Mux powerdown */
+#define AC97_PWR_PR1 0x0200 /* DAC powerdown */
+#define AC97_PWR_PR2 0x0400 /* Output mixer powerdown (Vref on) */
+#define AC97_PWR_PR3 0x0800 /* Output mixer powerdown (Vref off) */
+#define AC97_PWR_PR4 0x1000 /* AC-link powerdown */
+#define AC97_PWR_PR5 0x2000 /* Internal Clk disable */
+#define AC97_PWR_PR6 0x4000 /* HP amp powerdown */
+#define AC97_PWR_PR7 0x8000 /* Modem off - if supported */
+
+/* useful power states */
+#define AC97_PWR_D0 0x0000 /* everything on */
+#define AC97_PWR_D1 AC97_PWR_PR0|AC97_PWR_PR1|AC97_PWR_PR4
+#define AC97_PWR_D2 AC97_PWR_PR0|AC97_PWR_PR1|AC97_PWR_PR2|AC97_PWR_PR3|AC97_PWR_PR4
+#define AC97_PWR_D3 AC97_PWR_PR0|AC97_PWR_PR1|AC97_PWR_PR2|AC97_PWR_PR3|AC97_PWR_PR4
+#define AC97_PWR_ANLOFF AC97_PWR_PR2|AC97_PWR_PR3 /* analog section off */
+
+/* Total number of defined registers. */
+#define AC97_REG_CNT 64
+
+/* Generic AC97 mixer interface. */
+
+/* Structure describing access to the hardware. */
+struct ac97_hwint
+{
+ /* Perform any hardware-specific reset and initialization. Returns
+ 0 on success, or a negative error code. */
+ int (*reset_device) (struct ac97_hwint *dev);
+
+ /* Returns the contents of the specified register REG. The caller
+ should check to see if the desired contents are available in
+ the cache first, if applicable. Returns a positive unsigned value
+ representing the contents of the register, or a negative error
+ code. */
+ int (*read_reg) (struct ac97_hwint *dev, u8 reg);
+
+ /* Writes VALUE to register REG. Returns 0 on success, or a
+ negative error code. */
+ int (*write_reg) (struct ac97_hwint *dev, u8 reg, u16 value);
+
+ /* Hardware-specific information. */
+ void *driver_private;
+
+ /* Three OSS masks. */
+ int mixer_devmask;
+ int mixer_stereomask;
+ int mixer_recmask;
+
+ /* The mixer cache. The indices correspond to the AC97 hardware register
+ number / 2, since the register numbers are always an even number.
+
+ Unknown values are set to -1; unsupported registers contain a
+ -2. */
+ int last_written_mixer_values[AC97_REG_CNT];
+
+ /* A cache of values written via OSS; we need these so we can return
+ the values originally written by the user.
+
+ Why the original user values? Because the real-world hardware
+ has less precision, and some existing applications assume that
+ they will get back the exact value that they wrote (aumix).
+
+ A -1 value indicates that no value has been written to this mixer
+ channel via OSS. */
+ int last_written_OSS_values[SOUND_MIXER_NRDEVICES];
+};
+
+/* Values stored in the register cache. */
+#define AC97_REGVAL_UNKNOWN -1
+#define AC97_REG_UNSUPPORTED -2
+
+struct ac97_mixer_value_list
+{
+ /* Mixer channel to set. List is terminated by a value of -1. */
+ int oss_channel;
+ /* The scaled value to set it to; values generally range from 0-100. */
+ union {
+ struct {
+ u8 left, right;
+ } stereo;
+ u8 mono;
+ } value;
+};
+
+/* Initialize the ac97 mixer by resetting it. */
+extern int ac97_init (struct ac97_hwint *dev);
+
+/* Sets the mixer DEV to the values in VALUE_LIST. Returns 0 on success,
+ or a negative error code. */
+extern int ac97_set_values (struct ac97_hwint *dev,
+ struct ac97_mixer_value_list *value_list);
+
+/* Writes the specified VALUE to the AC97 register REG in the mixer.
+ Takes care of setting the last-written cache as well. */
+extern int ac97_put_register (struct ac97_hwint *dev, u8 reg, u16 value);
+
+/* Default ioctl. */
+extern int ac97_mixer_ioctl (struct ac97_hwint *dev, unsigned int cmd,
+ void __user * arg);
+
+/* Do a complete reset on the AC97 mixer, restoring all mixer registers to
+ the current values. Normally used after an APM resume event. */
+extern int ac97_reset (struct ac97_hwint *dev);
+#endif
+
+/*
+ * Local variables:
+ * c-basic-offset: 4
+ * End:
+ */
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