[ALSA] emu10k1 - EMU 1212 with 16 capture channels

* adding 8 more 32-bit capture channels (total of 16) for emu1010 cards
* adding some code comments and card details description

Signed-off-by: Pavel Hofman <dustin@seznam.cz>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@suse.cz>

include/sound/emu10k1.h

@@ -1120,6 +1120,16 @@
 /************************************************************************************************/
 /* EMU1010m HANA Destinations									*/
 /************************************************************************************************/
+/* 32-bit destinations of signal in the Hana FPGA. Destinations are either
+ * physical outputs of Hana, or outputs going to Alice2 (audigy) for capture
+ * - 16 x EMU_DST_ALICE2_EMU32_X.
+ */
+/* EMU32 = 32-bit serial channel between Alice2 (audigy) and Hana (FPGA) */
+/* EMU_DST_ALICE2_EMU32_X - data channels from Hana to Alice2 used for capture.
+ * Which data is fed into a EMU_DST_ALICE2_EMU32_X channel in Hana depends on
+ * setup of mixer control for each destination - see emumixer.c -
+ * snd_emu1010_output_enum_ctls[], snd_emu1010_input_enum_ctls[]
+ */
 #define EMU_DST_ALICE2_EMU32_0	0x000f	/* 16 EMU32 channels to Alice2 +0 to +0xf */
 #define EMU_DST_ALICE2_EMU32_1	0x0000	/* 16 EMU32 channels to Alice2 +0 to +0xf */
 #define EMU_DST_ALICE2_EMU32_2	0x0001	/* 16 EMU32 channels to Alice2 +0 to +0xf */
@@ -1199,6 +1209,12 @@
 /************************************************************************************************/
 /* EMU1010m HANA Sources									*/
 /************************************************************************************************/
+/* 32-bit sources of signal in the Hana FPGA. The sources are routed to
+ * destinations using mixer control for each destination - see emumixer.c
+ * Sources are either physical inputs of FPGA,
+ * or outputs from Alice (audigy) - 16 x EMU_SRC_ALICE_EMU32A +
+ * 16 x EMU_SRC_ALICE_EMU32B
+ */
 #define EMU_SRC_SILENCE		0x0000	/* Silence */
 #define EMU_SRC_DOCK_MIC_A1	0x0100	/* Audio Dock Mic A, 1st or 48kHz only */
 #define EMU_SRC_DOCK_MIC_A2	0x0101	/* Audio Dock Mic A, 2nd or 96kHz */

sound/pci/emu10k1/emu10k1_main.c

@@ -694,6 +694,37 @@ static int snd_emu1010_load_firmware(struct snd_emu10k1 * emu, const char * file
 	return 0;
 }
 
+/*
+ * EMU-1010 - details found out from this driver, official MS Win drivers,
+ * testing the card:
+ *
+ * Audigy2 (aka Alice2):
+ * ---------------------
+ * 	* communication over PCI
+ * 	* conversion of 32-bit data coming over EMU32 links from HANA FPGA
+ *	  to 2 x 16-bit, using internal DSP instructions
+ * 	* slave mode, clock supplied by HANA
+ * 	* linked to HANA using:
+ * 		32 x 32-bit serial EMU32 output channels
+ * 		16 x EMU32 input channels
+ * 		(?) x I2S I/O channels (?)
+ *
+ * FPGA (aka HANA):
+ * ---------------
+ * 	* provides all (?) physical inputs and outputs of the card
+ * 		(ADC, DAC, SPDIF I/O, ADAT I/O, etc.)
+ * 	* provides clock signal for the card and Alice2
+ * 	* two crystals - for 44.1kHz and 48kHz multiples
+ * 	* provides internal routing of signal sources to signal destinations
+ * 	* inputs/outputs to Alice2 - see above
+ *
+ * Current status of the driver:
+ * ----------------------------
+ * 	* only 44.1/48kHz supported (the MS Win driver supports up to 192 kHz)
+ * 	* PCM device nb. 2:
+ *		16 x 16-bit playback - snd_emu10k1_fx8010_playback_ops
+ * 		16 x 32-bit capture - snd_emu10k1_capture_efx_ops
+ */
 static int snd_emu10k1_emu1010_init(struct snd_emu10k1 * emu)
 {
 	unsigned int i;
@@ -850,6 +881,27 @@ static int snd_emu10k1_emu1010_init(struct snd_emu10k1 * emu)
 		EMU_DST_ALICE2_EMU32_6, EMU_SRC_DOCK_ADC2_LEFT1);
 	snd_emu1010_fpga_link_dst_src_write(emu,
 		EMU_DST_ALICE2_EMU32_7, EMU_SRC_DOCK_ADC2_RIGHT1);
+	/* Pavel Hofman - setting defaults for 8 more capture channels
+	 * Defaults only, users will set their own values anyways, let's
+	 * just copy/paste.
+	 */
+	
+	snd_emu1010_fpga_link_dst_src_write(emu,
+		EMU_DST_ALICE2_EMU32_8, EMU_SRC_DOCK_MIC_A1);
+	snd_emu1010_fpga_link_dst_src_write(emu,
+		EMU_DST_ALICE2_EMU32_9, EMU_SRC_DOCK_MIC_B1);
+	snd_emu1010_fpga_link_dst_src_write(emu,
+		EMU_DST_ALICE2_EMU32_A, EMU_SRC_HAMOA_ADC_LEFT2);
+	snd_emu1010_fpga_link_dst_src_write(emu,
+		EMU_DST_ALICE2_EMU32_B, EMU_SRC_HAMOA_ADC_LEFT2);
+	snd_emu1010_fpga_link_dst_src_write(emu,
+		EMU_DST_ALICE2_EMU32_C, EMU_SRC_DOCK_ADC1_LEFT1);
+	snd_emu1010_fpga_link_dst_src_write(emu,
+		EMU_DST_ALICE2_EMU32_D, EMU_SRC_DOCK_ADC1_RIGHT1);
+	snd_emu1010_fpga_link_dst_src_write(emu,
+		EMU_DST_ALICE2_EMU32_E, EMU_SRC_DOCK_ADC2_LEFT1);
+	snd_emu1010_fpga_link_dst_src_write(emu,
+		EMU_DST_ALICE2_EMU32_F, EMU_SRC_DOCK_ADC2_RIGHT1);
 #endif
 #if 0
 	/* Original */

sound/pci/emu10k1/emufx.c

@@ -1123,6 +1123,11 @@ snd_emu10k1_init_stereo_onoff_control(struct snd_emu10k1_fx8010_control_gpr *ctl
 	ctl->translation = EMU10K1_GPR_TRANSLATION_ONOFF;
 }
 
+/*
+ * Used for emu1010 - conversion from 32-bit capture inputs from HANA
+ * to 2 x 16-bit registers in audigy - their values are read via DMA.
+ * Conversion is performed by Audigy DSP instructions of FX8010.
+ */
 static int snd_emu10k1_audigy_dsp_convert_32_to_2x16(
 				struct snd_emu10k1_fx8010_code *icode,
 				u32 *ptr, int tmp, int bit_shifter16,
@@ -1193,7 +1198,11 @@ static int __devinit _snd_emu10k1_audigy_init_efx(struct snd_emu10k1 *emu)
 	snd_emu10k1_ptr_write(emu, A_DBG, 0, (emu->fx8010.dbg = 0) | A_DBG_SINGLE_STEP);
 
 #if 1
-	/* PCM front Playback Volume (independent from stereo mix) */
+	/* PCM front Playback Volume (independent from stereo mix)
+	 * playback = 0 + ( gpr * FXBUS_PCM_LEFT_FRONT >> 31)
+	 * where gpr contains attenuation from corresponding mixer control
+	 * (snd_emu10k1_init_stereo_control)
+	 */
 	A_OP(icode, &ptr, iMAC0, A_GPR(playback), A_C_00000000, A_GPR(gpr), A_FXBUS(FXBUS_PCM_LEFT_FRONT));
 	A_OP(icode, &ptr, iMAC0, A_GPR(playback+1), A_C_00000000, A_GPR(gpr+1), A_FXBUS(FXBUS_PCM_RIGHT_FRONT));
 	snd_emu10k1_init_stereo_control(&controls[nctl++], "PCM Front Playback Volume", gpr, 100);
@@ -1549,7 +1558,7 @@ A_OP(icode, &ptr, iMAC0, A_GPR(var), A_GPR(var), A_GPR(vol), A_EXTIN(input))
 
 	if (emu->card_capabilities->emu1010) {
 		snd_printk("EMU inputs on\n");
-		/* Capture 8 channels of S32_LE sound */
+		/* Capture 16 (originally 8) channels of S32_LE sound */
 		
 		/* printk("emufx.c: gpr=0x%x, tmp=0x%x\n",gpr, tmp); */
 		/* For the EMU1010: How to get 32bit values from the DSP. High 16bits into L, low 16bits into R. */
@@ -1560,6 +1569,11 @@ A_OP(icode, &ptr, iMAC0, A_GPR(var), A_GPR(var), A_GPR(vol), A_EXTIN(input))
 		snd_emu10k1_audigy_dsp_convert_32_to_2x16( icode, &ptr, tmp, bit_shifter16, A_P16VIN(0x0), A_FXBUS2(0) );
 		/* Right ADC in 1 of 2 */
 		gpr_map[gpr++] = 0x00000000;
+		/* Delaying by one sample: instead of copying the input
+		 * value A_P16VIN to output A_FXBUS2 as in the first channel,
+		 * we use an auxiliary register, delaying the value by one
+		 * sample
+		 */
 		snd_emu10k1_audigy_dsp_convert_32_to_2x16( icode, &ptr, tmp, bit_shifter16, A_GPR(gpr - 1), A_FXBUS2(2) );
 		A_OP(icode, &ptr, iACC3, A_GPR(gpr - 1), A_P16VIN(0x1), A_C_00000000, A_C_00000000);
 		gpr_map[gpr++] = 0x00000000;
@@ -1583,6 +1597,66 @@ A_OP(icode, &ptr, iMAC0, A_GPR(var), A_GPR(var), A_GPR(vol), A_EXTIN(input))
 		gpr_map[gpr++] = 0x00000000;
 		snd_emu10k1_audigy_dsp_convert_32_to_2x16( icode, &ptr, tmp, bit_shifter16, A_GPR(gpr - 1), A_FXBUS2(0xe) );
 		A_OP(icode, &ptr, iACC3, A_GPR(gpr - 1), A_P16VIN(0x7), A_C_00000000, A_C_00000000);
+		/* Pavel Hofman - we still have voices, A_FXBUS2s, and
+		 * A_P16VINs available -
+		 * let's add 8 more capture channels - total of 16
+		 */
+		gpr_map[gpr++] = 0x00000000;
+		snd_emu10k1_audigy_dsp_convert_32_to_2x16(icode, &ptr, tmp,
+							  bit_shifter16,
+							  A_GPR(gpr - 1),
+							  A_FXBUS2(0x10));
+		A_OP(icode, &ptr, iACC3, A_GPR(gpr - 1), A_P16VIN(0x8),
+		     A_C_00000000, A_C_00000000);
+		gpr_map[gpr++] = 0x00000000;
+		snd_emu10k1_audigy_dsp_convert_32_to_2x16(icode, &ptr, tmp,
+							  bit_shifter16,
+							  A_GPR(gpr - 1),
+							  A_FXBUS2(0x12));
+		A_OP(icode, &ptr, iACC3, A_GPR(gpr - 1), A_P16VIN(0x9),
+		     A_C_00000000, A_C_00000000);
+		gpr_map[gpr++] = 0x00000000;
+		snd_emu10k1_audigy_dsp_convert_32_to_2x16(icode, &ptr, tmp,
+							  bit_shifter16,
+							  A_GPR(gpr - 1),
+							  A_FXBUS2(0x14));
+		A_OP(icode, &ptr, iACC3, A_GPR(gpr - 1), A_P16VIN(0xa),
+		     A_C_00000000, A_C_00000000);
+		gpr_map[gpr++] = 0x00000000;
+		snd_emu10k1_audigy_dsp_convert_32_to_2x16(icode, &ptr, tmp,
+							  bit_shifter16,
+							  A_GPR(gpr - 1),
+							  A_FXBUS2(0x16));
+		A_OP(icode, &ptr, iACC3, A_GPR(gpr - 1), A_P16VIN(0xb),
+		     A_C_00000000, A_C_00000000);
+		gpr_map[gpr++] = 0x00000000;
+		snd_emu10k1_audigy_dsp_convert_32_to_2x16(icode, &ptr, tmp,
+							  bit_shifter16,
+							  A_GPR(gpr - 1),
+							  A_FXBUS2(0x18));
+		A_OP(icode, &ptr, iACC3, A_GPR(gpr - 1), A_P16VIN(0xc),
+		     A_C_00000000, A_C_00000000);
+		gpr_map[gpr++] = 0x00000000;
+		snd_emu10k1_audigy_dsp_convert_32_to_2x16(icode, &ptr, tmp,
+							  bit_shifter16,
+							  A_GPR(gpr - 1),
+							  A_FXBUS2(0x1a));
+		A_OP(icode, &ptr, iACC3, A_GPR(gpr - 1), A_P16VIN(0xd),
+		     A_C_00000000, A_C_00000000);
+		gpr_map[gpr++] = 0x00000000;
+		snd_emu10k1_audigy_dsp_convert_32_to_2x16(icode, &ptr, tmp,
+							  bit_shifter16,
+							  A_GPR(gpr - 1),
+							  A_FXBUS2(0x1c));
+		A_OP(icode, &ptr, iACC3, A_GPR(gpr - 1), A_P16VIN(0xe),
+		     A_C_00000000, A_C_00000000);
+		gpr_map[gpr++] = 0x00000000;
+		snd_emu10k1_audigy_dsp_convert_32_to_2x16(icode, &ptr, tmp,
+							  bit_shifter16,
+							  A_GPR(gpr - 1),
+							  A_FXBUS2(0x1e));
+		A_OP(icode, &ptr, iACC3, A_GPR(gpr - 1), A_P16VIN(0xf),
+		     A_C_00000000, A_C_00000000);
 
 #if 0
 		for (z = 4; z < 8; z++) {

sound/pci/emu10k1/emumixer.c

@@ -77,6 +77,10 @@ static int snd_emu10k1_spdif_get_mask(struct snd_kcontrol *kcontrol,
 	return 0;
 }
 
+/*
+ * Items labels in enum mixer controls assigning source data to
+ * each destination
+ */
 static char *emu1010_src_texts[] = { 
 	"Silence",
 	"Dock Mic A",
@@ -133,6 +137,9 @@ static char *emu1010_src_texts[] = {
 	"DSP 31",
 };
 
+/*
+ * List of data sources available for each destination
+ */
 static unsigned int emu1010_src_regs[] = {
 	EMU_SRC_SILENCE,/* 0 */
 	EMU_SRC_DOCK_MIC_A1, /* 1 */
@@ -189,6 +196,10 @@ static unsigned int emu1010_src_regs[] = {
 	EMU_SRC_ALICE_EMU32B+0xf, /* 52 */
 };
 
+/*
+ * Data destinations - physical EMU outputs.
+ * Each destination has an enum mixer control to choose a data source
+ */
 static unsigned int emu1010_output_dst[] = {
 	EMU_DST_DOCK_DAC1_LEFT1, /* 0 */
 	EMU_DST_DOCK_DAC1_RIGHT1, /* 1 */
@@ -216,6 +227,11 @@ static unsigned int emu1010_output_dst[] = {
 	EMU_DST_HANA_ADAT+7, /* 23 */
 };
 
+/*
+ * Data destinations - HANA outputs going to Alice2 (audigy) for
+ *   capture (EMU32 + I2S links)
+ * Each destination has an enum mixer control to choose a data source
+ */
 static unsigned int emu1010_input_dst[] = {
 	EMU_DST_ALICE2_EMU32_0,
 	EMU_DST_ALICE2_EMU32_1,

sound/pci/emu10k1/emupcm.c

@@ -1233,24 +1233,26 @@ static int snd_emu10k1_capture_efx_open(struct snd_pcm_substream *substream)
 	runtime->hw.rate_min = runtime->hw.rate_max = 48000;
 	spin_lock_irq(&emu->reg_lock);
 	if (emu->card_capabilities->emu1010) {
-		/* TODO 
+		/*  Nb. of channels has been increased to 16 */
+		/* TODO
 		 * SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S32_LE
 		 * SNDRV_PCM_RATE_44100 | SNDRV_PCM_RATE_48000 |
 		 * SNDRV_PCM_RATE_88200 | SNDRV_PCM_RATE_96000 |
 		 * SNDRV_PCM_RATE_176400 | SNDRV_PCM_RATE_192000
 		 * rate_min = 44100,
 		 * rate_max = 192000,
-		 * channels_min = 8,
-		 * channels_max = 8,
+		 * channels_min = 16,
+		 * channels_max = 16,
 		 * Need to add mixer control to fix sample rate
 		 *                 
-		 * There are 16 mono channels of 16bits each.
+		 * There are 32 mono channels of 16bits each.
 		 * 24bit Audio uses 2x channels over 16bit
 		 * 96kHz uses 2x channels over 48kHz
 		 * 192kHz uses 4x channels over 48kHz
-		 * So, for 48kHz 24bit, one has 8 channels
-		 * for 96kHz 24bit, one has 4 channels
-		 * for 192kHz 24bit, one has 2 channels
+		 * So, for 48kHz 24bit, one has 16 channels
+		 * for 96kHz 24bit, one has 8 channels
+		 * for 192kHz 24bit, one has 4 channels
+		 *
 		 */
 #if 1
 		switch (emu->emu1010.internal_clock) {
@@ -1258,13 +1260,15 @@ static int snd_emu10k1_capture_efx_open(struct snd_pcm_substream *substream)
 			/* For 44.1kHz */
 			runtime->hw.rates = SNDRV_PCM_RATE_44100;
 			runtime->hw.rate_min = runtime->hw.rate_max = 44100;
-			runtime->hw.channels_min = runtime->hw.channels_max = 8;
+			runtime->hw.channels_min =
+				runtime->hw.channels_max = 16;
 			break;
 		case 1:
 			/* For 48kHz */
 			runtime->hw.rates = SNDRV_PCM_RATE_48000;
 			runtime->hw.rate_min = runtime->hw.rate_max = 48000;
-			runtime->hw.channels_min = runtime->hw.channels_max = 8;
+			runtime->hw.channels_min =
+				runtime->hw.channels_max = 16;
 			break;
 		};
 #endif
@@ -1282,7 +1286,7 @@ static int snd_emu10k1_capture_efx_open(struct snd_pcm_substream *substream)
 #endif
 		runtime->hw.formats = SNDRV_PCM_FMTBIT_S32_LE;
 		/* efx_voices_mask[0] is expected to be zero
- 		 * efx_voices_mask[1] is expected to have 16bits set
+ 		 * efx_voices_mask[1] is expected to have 32bits set
 		 */
 	} else {
 		runtime->hw.channels_min = runtime->hw.channels_max = 0;
@@ -1787,11 +1791,24 @@ int __devinit snd_emu10k1_pcm_efx(struct snd_emu10k1 * emu, int device, struct s
 	/* emu->efx_voices_mask[0] = FXWC_DEFAULTROUTE_C | FXWC_DEFAULTROUTE_A; */
 	if (emu->audigy) {
 		emu->efx_voices_mask[0] = 0;
-		emu->efx_voices_mask[1] = 0xffff;
+		if (emu->card_capabilities->emu1010)
+			/* Pavel Hofman - 32 voices will be used for
+			 * capture (write mode) -
+			 * each bit = corresponding voice
+			 */
+			emu->efx_voices_mask[1] = 0xffffffff;
+		else
+			emu->efx_voices_mask[1] = 0xffff;
 	} else {
 		emu->efx_voices_mask[0] = 0xffff0000;
 		emu->efx_voices_mask[1] = 0;
 	}
+	/* For emu1010, the control has to set 32 upper bits (voices)
+	 * out of the 64 bits (voices) to true for the 16-channels capture
+	 * to work correctly. Correct A_FXWC2 initial value (0xffffffff)
+	 * is already defined but the snd_emu10k1_pcm_efx_voices_mask
+	 * control can override this register's value.
+	 */
 	kctl = snd_ctl_new1(&snd_emu10k1_pcm_efx_voices_mask, emu);
 	if (!kctl)
 		return -ENOMEM;