diff --git a/include/sound/cs4231-regs.h b/include/sound/cs4231-regs.h
index e8d1f3e..9264753 100644
--- a/include/sound/cs4231-regs.h
+++ b/include/sound/cs4231-regs.h
@@ -177,4 +177,12 @@
 #define CS4236_RIGHT_WAVE	0x1c	/* right wavetable serial port volume */
 #define CS4236_VERSION		0x9c	/* chip version and ID */
 
+/* definitions for extended registers - OPTI93X */
+#define OPTi931_AUX_LEFT_INPUT	0x10
+#define OPTi931_AUX_RIGHT_INPUT	0x11
+#define OPTi93X_MIC_LEFT_INPUT	0x14
+#define OPTi93X_MIC_RIGHT_INPUT	0x15
+#define OPTi93X_OUT_LEFT	0x16
+#define OPTi93X_OUT_RIGHT	0x17
+
 #endif /* __SOUND_CS4231_REGS_H */
diff --git a/include/sound/cs4231.h b/include/sound/cs4231.h
index 66055d7..f0785f9 100644
--- a/include/sound/cs4231.h
+++ b/include/sound/cs4231.h
@@ -58,6 +58,7 @@
 /* compatible, but clones */
 #define CS4231_HW_INTERWAVE     0x1000	/* InterWave chip */
 #define CS4231_HW_OPL3SA2       0x1101	/* OPL3-SA2 chip, similar to cs4231 */
+#define CS4231_HW_OPTI93X 	0x1102	/* Opti 930/931/933 */
 
 /* defines for codec.hwshare */
 #define CS4231_HWSHARE_IRQ	(1<<0)
@@ -120,6 +121,8 @@
 void snd_cs4231_mce_up(struct snd_cs4231 *chip);
 void snd_cs4231_mce_down(struct snd_cs4231 *chip);
 
+void snd_cs4231_overrange(struct snd_cs4231 *chip);
+
 irqreturn_t snd_cs4231_interrupt(int irq, void *dev_id);
 
 const char *snd_cs4231_chip_id(struct snd_cs4231 *chip);
diff --git a/sound/isa/cs423x/cs4231_lib.c b/sound/isa/cs423x/cs4231_lib.c
index 0aa8649..521db70 100644
--- a/sound/isa/cs423x/cs4231_lib.c
+++ b/sound/isa/cs423x/cs4231_lib.c
@@ -119,6 +119,42 @@
 	0x00,			/* 1f/31 - cbrl */
 };
 
+static unsigned char snd_opti93x_original_image[32] =
+{
+	0x00,		/* 00/00 - l_mixout_outctrl */
+	0x00,		/* 01/01 - r_mixout_outctrl */
+	0x88,		/* 02/02 - l_cd_inctrl */
+	0x88,		/* 03/03 - r_cd_inctrl */
+	0x88,		/* 04/04 - l_a1/fm_inctrl */
+	0x88,		/* 05/05 - r_a1/fm_inctrl */
+	0x80,		/* 06/06 - l_dac_inctrl */
+	0x80,		/* 07/07 - r_dac_inctrl */
+	0x00,		/* 08/08 - ply_dataform_reg */
+	0x00,		/* 09/09 - if_conf */
+	0x00,		/* 0a/10 - pin_ctrl */
+	0x00,		/* 0b/11 - err_init_reg */
+	0x0a,		/* 0c/12 - id_reg */
+	0x00,		/* 0d/13 - reserved */
+	0x00,		/* 0e/14 - ply_upcount_reg */
+	0x00,		/* 0f/15 - ply_lowcount_reg */
+	0x88,		/* 10/16 - reserved/l_a1_inctrl */
+	0x88,		/* 11/17 - reserved/r_a1_inctrl */
+	0x88,		/* 12/18 - l_line_inctrl */
+	0x88,		/* 13/19 - r_line_inctrl */
+	0x88,		/* 14/20 - l_mic_inctrl */
+	0x88,		/* 15/21 - r_mic_inctrl */
+	0x80,		/* 16/22 - l_out_outctrl */
+	0x80,		/* 17/23 - r_out_outctrl */
+	0x00,		/* 18/24 - reserved */
+	0x00,		/* 19/25 - reserved */
+	0x00,		/* 1a/26 - reserved */
+	0x00,		/* 1b/27 - reserved */
+	0x00,		/* 1c/28 - cap_dataform_reg */
+	0x00,		/* 1d/29 - reserved */
+	0x00,		/* 1e/30 - cap_upcount_reg */
+	0x00		/* 1f/31 - cap_lowcount_reg */
+};
+
 /*
  *  Basic I/O functions
  */
@@ -895,7 +931,7 @@
 	return 0;
 }
 
-static void snd_cs4231_overrange(struct snd_cs4231 *chip)
+void snd_cs4231_overrange(struct snd_cs4231 *chip)
 {
 	unsigned long flags;
 	unsigned char res;
@@ -1054,8 +1090,11 @@
 	chip->image[CS4231_IFACE_CTRL] =
 	    (chip->image[CS4231_IFACE_CTRL] & ~CS4231_SINGLE_DMA) |
 	    (chip->single_dma ? CS4231_SINGLE_DMA : 0);
-	chip->image[CS4231_ALT_FEATURE_1] = 0x80;
-	chip->image[CS4231_ALT_FEATURE_2] = chip->hardware == CS4231_HW_INTERWAVE ? 0xc2 : 0x01;
+	if (chip->hardware != CS4231_HW_OPTI93X) {
+		chip->image[CS4231_ALT_FEATURE_1] = 0x80;
+		chip->image[CS4231_ALT_FEATURE_2] =
+			chip->hardware == CS4231_HW_INTERWAVE ? 0xc2 : 0x01;
+	}
 	ptr = (unsigned char *) &chip->image;
 	snd_cs4231_mce_down(chip);
 	spin_lock_irqsave(&chip->reg_lock, flags);
@@ -1376,6 +1415,7 @@
 	case CS4231_HW_INTERWAVE: return "AMD InterWave";
 	case CS4231_HW_OPL3SA2: return chip->card->shortname;
 	case CS4231_HW_AD1845: return "AD1845";
+	case CS4231_HW_OPTI93X: return "OPTi 93x";
 	default: return "???";
 	}
 }
@@ -1401,8 +1441,13 @@
 	chip->rate_constraint = snd_cs4231_xrate;
 	chip->set_playback_format = snd_cs4231_playback_format;
 	chip->set_capture_format = snd_cs4231_capture_format;
-        memcpy(&chip->image, &snd_cs4231_original_image, sizeof(snd_cs4231_original_image));
-        
+	if (chip->hardware == CS4231_HW_OPTI93X)
+		memcpy(&chip->image, &snd_opti93x_original_image,
+		       sizeof(snd_opti93x_original_image));
+	else
+		memcpy(&chip->image, &snd_cs4231_original_image,
+		       sizeof(snd_cs4231_original_image));
+
         *rchip = chip;
         return 0;
 }
@@ -1790,6 +1835,48 @@
 CS4231_SINGLE("Loopback Capture Volume", 0, CS4231_LOOPBACK, 2, 63, 1)
 };
                                         
+static struct snd_kcontrol_new snd_opti93x_controls[] = {
+CS4231_DOUBLE("Master Playback Switch", 0,
+	      OPTi93X_OUT_LEFT, OPTi93X_OUT_RIGHT, 7, 7, 1, 1),
+CS4231_DOUBLE("Master Playback Volume", 0,
+	      OPTi93X_OUT_LEFT, OPTi93X_OUT_RIGHT, 1, 1, 31, 1),
+CS4231_DOUBLE("PCM Playback Switch", 0,
+	      CS4231_LEFT_OUTPUT, CS4231_RIGHT_OUTPUT, 7, 7, 1, 1),
+CS4231_DOUBLE("PCM Playback Volume", 0,
+	      CS4231_LEFT_OUTPUT, CS4231_RIGHT_OUTPUT, 0, 0, 31, 1),
+CS4231_DOUBLE("FM Playback Switch", 0,
+	      CS4231_AUX2_LEFT_INPUT, CS4231_AUX2_RIGHT_INPUT, 7, 7, 1, 1),
+CS4231_DOUBLE("FM Playback Volume", 0,
+	      CS4231_AUX2_LEFT_INPUT, CS4231_AUX2_RIGHT_INPUT, 1, 1, 15, 1),
+CS4231_DOUBLE("Line Playback Switch", 0,
+	      CS4231_LEFT_LINE_IN, CS4231_RIGHT_LINE_IN, 7, 7, 1, 1),
+CS4231_DOUBLE("Line Playback Volume", 0,
+	      CS4231_LEFT_LINE_IN, CS4231_RIGHT_LINE_IN, 0, 0, 15, 1),
+CS4231_DOUBLE("Mic Playback Switch", 0,
+	      OPTi93X_MIC_LEFT_INPUT, OPTi93X_MIC_RIGHT_INPUT, 7, 7, 1, 1),
+CS4231_DOUBLE("Mic Playback Volume", 0,
+	      OPTi93X_MIC_LEFT_INPUT, OPTi93X_MIC_RIGHT_INPUT, 1, 1, 15, 1),
+CS4231_DOUBLE("Mic Boost", 0,
+	      CS4231_LEFT_INPUT, CS4231_RIGHT_INPUT, 5, 5, 1, 0),
+CS4231_DOUBLE("CD Playback Switch", 0,
+	      CS4231_AUX1_LEFT_INPUT, CS4231_AUX1_RIGHT_INPUT, 7, 7, 1, 1),
+CS4231_DOUBLE("CD Playback Volume", 0,
+	      CS4231_AUX1_LEFT_INPUT, CS4231_AUX1_RIGHT_INPUT, 1, 1, 15, 1),
+CS4231_DOUBLE("Aux Playback Switch", 0,
+	      OPTi931_AUX_LEFT_INPUT, OPTi931_AUX_RIGHT_INPUT, 7, 7, 1, 1),
+CS4231_DOUBLE("Aux Playback Volume", 0,
+	      OPTi931_AUX_LEFT_INPUT, OPTi931_AUX_RIGHT_INPUT, 1, 1, 15, 1),
+CS4231_DOUBLE("Capture Volume", 0,
+	      CS4231_LEFT_INPUT, CS4231_RIGHT_INPUT, 0, 0, 15, 0),
+{
+	.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
+	.name = "Capture Source",
+	.info = snd_cs4231_info_mux,
+	.get = snd_cs4231_get_mux,
+	.put = snd_cs4231_put_mux,
+}
+};
+
 int snd_cs4231_mixer(struct snd_cs4231 *chip)
 {
 	struct snd_card *card;
@@ -1802,10 +1889,22 @@
 
 	strcpy(card->mixername, chip->pcm->name);
 
-	for (idx = 0; idx < ARRAY_SIZE(snd_cs4231_controls); idx++) {
-		if ((err = snd_ctl_add(card, snd_ctl_new1(&snd_cs4231_controls[idx], chip))) < 0)
-			return err;
-	}
+	if (chip->hardware == CS4231_HW_OPTI93X)
+		for (idx = 0; idx < ARRAY_SIZE(snd_opti93x_controls); idx++) {
+			err = snd_ctl_add(card,
+					snd_ctl_new1(&snd_opti93x_controls[idx],
+						     chip));
+			if (err < 0)
+				return err;
+		}
+	else
+		for (idx = 0; idx < ARRAY_SIZE(snd_cs4231_controls); idx++) {
+			err = snd_ctl_add(card,
+					snd_ctl_new1(&snd_cs4231_controls[idx],
+						     chip));
+			if (err < 0)
+				return err;
+		}
 	return 0;
 }
 
@@ -1815,6 +1914,7 @@
 EXPORT_SYMBOL(snd_cs4236_ext_in);
 EXPORT_SYMBOL(snd_cs4231_mce_up);
 EXPORT_SYMBOL(snd_cs4231_mce_down);
+EXPORT_SYMBOL(snd_cs4231_overrange);
 EXPORT_SYMBOL(snd_cs4231_interrupt);
 EXPORT_SYMBOL(snd_cs4231_chip_id);
 EXPORT_SYMBOL(snd_cs4231_create);