[ALSA] oxygen: make AC97 codec optional

Only initialize and create mixer controls for the first AC97 codec when
one has actually been detected.
Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Signed-off-by: Jaroslav Kysela <perex@perex.cz>

sound/pci/oxygen/oxygen.h

@@ -56,7 +56,8 @@ struct oxygen {
 	u8 spdif_playback_enable;
 	u8 ak4396_reg1;
 	u8 revision;
-	u8 has_2nd_ac97_codec;
+	u8 has_ac97_0;
+	u8 has_ac97_1;
 	u32 spdif_bits;
 	u32 spdif_pcm_bits;
 	struct snd_pcm_substream *streams[PCM_COUNT];

sound/pci/oxygen/oxygen_lib.c

@@ -142,6 +142,7 @@ static void oxygen_proc_read(struct snd_info_entry *entry,
 	}
 	if (mutex_lock_interruptible(&chip->mutex) < 0)
 		return;
+	if (chip->has_ac97_0) {
 		snd_iprintf(buffer, "\nAC97\n");
 		for (i = 0; i < 0x80; i += 0x10) {
 			snd_iprintf(buffer, "%02x:", i);
@@ -150,6 +151,17 @@ static void oxygen_proc_read(struct snd_info_entry *entry,
 					    oxygen_read_ac97(chip, 0, i + j));
 			snd_iprintf(buffer, "\n");
 		}
+	}
+	if (chip->has_ac97_1) {
+		snd_iprintf(buffer, "\nAC97 2\n");
+		for (i = 0; i < 0x80; i += 0x10) {
+			snd_iprintf(buffer, "%02x:", i);
+			for (j = 0; j < 0x10; j += 2)
+				snd_iprintf(buffer, " %04x",
+					    oxygen_read_ac97(chip, 1, i + j));
+			snd_iprintf(buffer, "\n");
+		}
+	}
 	mutex_unlock(&chip->mutex);
 }
 
@@ -184,6 +196,10 @@ static void __devinit oxygen_init(struct oxygen *chip)
 	if (chip->revision == 1)
 		oxygen_set_bits8(chip, OXYGEN_MISC, OXYGEN_MISC_MAGIC);
 
+	i = oxygen_read16(chip, OXYGEN_AC97_CONTROL);
+	chip->has_ac97_0 = (i & OXYGEN_AC97_CODEC_0) != 0;
+	chip->has_ac97_1 = (i & OXYGEN_AC97_CODEC_1) != 0;
+
 	oxygen_set_bits8(chip, OXYGEN_FUNCTION,
 			 OXYGEN_FUNCTION_RESET_CODEC |
 			 OXYGEN_FUNCTION_ENABLE_SPI_4_5);
@@ -202,6 +218,7 @@ static void __devinit oxygen_init(struct oxygen *chip)
 	oxygen_write16(chip, OXYGEN_DMA_STATUS, 0);
 
 	oxygen_write8(chip, OXYGEN_AC97_INTERRUPT_MASK, 0x00);
+	if (chip->has_ac97_0) {
 		oxygen_clear_bits16(chip, OXYGEN_AC97_OUT_CONFIG,
 				    OXYGEN_AC97_OUT_MAGIC3);
 		oxygen_set_bits16(chip, OXYGEN_AC97_IN_CONFIG,
@@ -227,6 +244,7 @@ static void __devinit oxygen_init(struct oxygen *chip)
 				     AC97_PD_PR0 | AC97_PD_PR1);
 		oxygen_ac97_set_bits(chip, 0, AC97_EXTENDED_STATUS,
 				     AC97_EA_PRI | AC97_EA_PRJ | AC97_EA_PRK);
+	}
 }
 
 static void oxygen_card_free(struct snd_card *card)

sound/pci/oxygen/oxygen_mixer.c

@@ -597,6 +597,9 @@ static const struct snd_kcontrol_new controls[] = {
 		.info = spdif_info,
 		.get = spdif_input_default_get,
 	},
+};
+
+static const struct snd_kcontrol_new ac97_controls[] = {
 	AC97_VOLUME("Mic Capture Volume", AC97_MIC),
 	AC97_SWITCH("Mic Capture Switch", AC97_MIC, 15, 1),
 	AC97_SWITCH("Mic Boost (+20dB)", AC97_MIC, 6, 0),
@@ -617,7 +620,9 @@ static void oxygen_any_ctl_free(struct snd_kcontrol *ctl)
 		chip->controls[i] = NULL;
 }
 
-int oxygen_mixer_init(struct oxygen *chip)
+static int add_controls(struct oxygen *chip,
+			const struct snd_kcontrol_new controls[],
+			unsigned int count)
 {
 	static const char *const known_ctl_names[CONTROL_COUNT] = {
 		[CONTROL_SPDIF_PCM] =
@@ -633,7 +638,7 @@ int oxygen_mixer_init(struct oxygen *chip)
 	struct snd_kcontrol *ctl;
 	int err;
 
-	for (i = 0; i < ARRAY_SIZE(controls); ++i) {
+	for (i = 0; i < count; ++i) {
 		ctl = snd_ctl_new1(&controls[i], chip);
 		if (!ctl)
 			return -ENOMEM;
@@ -651,5 +656,21 @@ int oxygen_mixer_init(struct oxygen *chip)
 				ctl->private_free = oxygen_any_ctl_free;
 			}
 	}
+	return 0;
+}
+
+int oxygen_mixer_init(struct oxygen *chip)
+{
+	int err;
+
+	err = add_controls(chip, controls, ARRAY_SIZE(controls));
+	if (err < 0)
+		return err;
+	if (chip->has_ac97_0) {
+		err = add_controls(chip, ac97_controls,
+				   ARRAY_SIZE(ac97_controls));
+		if (err < 0)
+			return err;
+	}
 	return chip->model->mixer_init ? chip->model->mixer_init(chip) : 0;
 }

sound/pci/oxygen/oxygen_pcm.c

@@ -714,7 +714,7 @@ int __devinit oxygen_pcm_init(struct oxygen *chip)
 					      snd_dma_pci_data(chip->pci),
 					      128 * 1024, 256 * 1024);
 
-	if (chip->has_2nd_ac97_codec) {
+	if (chip->has_ac97_1) {
 		err = snd_pcm_new(chip->card, "AC97", 2, 1, 0, &pcm);
 		if (err < 0)
 			return err;