[ALSA] Adds Capture to P16V chip.

EMU10K1/EMU10K2 driver
One can select which capture source, but one cannot yet set volumes.
Signed-off-by: James Courtier-Dutton <James@superbug.co.uk>

include/sound/emu10k1.h

@@ -83,7 +83,8 @@
 #define IPR			0x08		/* Global interrupt pending register		*/
 						/* Clear pending interrupts by writing a 1 to	*/
 						/* the relevant bits and zero to the other bits	*/
-
+#define IPR_P16V		0x80000000	/* Bit set when the CA0151 P16V chip wishes
+						   to interrupt */
 #define IPR_GPIOMSG		0x20000000	/* GPIO message interrupt (RE'd, still not sure 
 						   which INTE bits enable it)			*/
 
@@ -1109,7 +1110,9 @@ struct _snd_emu10k1 {
 
 	emu10k1_voice_t voices[NUM_G];
 	emu10k1_voice_t p16v_voices[4];
+	emu10k1_voice_t p16v_capture_voice;
 	int p16v_device_offset;
+	u32 p16v_capture_source;
 	emu10k1_pcm_mixer_t pcm_mixer[32];
 	emu10k1_pcm_mixer_t efx_pcm_mixer[NUM_EFX_PLAYBACK];
 	snd_kcontrol_t *ctl_send_routing;

sound/pci/emu10k1/irq.c

@@ -37,7 +37,7 @@ irqreturn_t snd_emu10k1_interrupt(int irq, void *dev_id, struct pt_regs *regs)
 	int handled = 0;
 
 	while ((status = inl(emu->port + IPR)) != 0) {
-		// printk("irq - status = 0x%x\n", status);
+		//printk("emu10k1 irq - status = 0x%x\n", status);
 		orig_status = status;
 		handled = 1;
 		if (status & IPR_PCIERROR) {
@@ -147,9 +147,36 @@ irqreturn_t snd_emu10k1_interrupt(int irq, void *dev_id, struct pt_regs *regs)
 				snd_emu10k1_intr_disable(emu, INTE_FXDSPENABLE);
 			status &= ~IPR_FXDSP;
 		}
+		if (status & IPR_P16V) {
+			while ((status2 = inl(emu->port + IPR2)) != 0) {
+				u32 mask = INTE2_PLAYBACK_CH_0_LOOP;  /* Full Loop */
+				emu10k1_voice_t *pvoice = &(emu->p16v_voices[0]);
+				emu10k1_voice_t *cvoice = &(emu->p16v_capture_voice);
+
+				//printk(KERN_INFO "status2=0x%x\n", status2);
+				orig_status2 = status2;
+				if(status2 & mask) {
+					if(pvoice->use) {
+						snd_pcm_period_elapsed(pvoice->epcm->substream);
+					} else { 
+						snd_printk(KERN_ERR "p16v: status: 0x%08x, mask=0x%08x, pvoice=%p, use=%d\n", status2, mask, pvoice, pvoice->use);
+					}
+				}
+				if(status2 & 0x110000) {
+					//printk(KERN_INFO "capture int found\n");
+					if(cvoice->use) {
+						//printk(KERN_INFO "capture period_elapsed\n");
+						snd_pcm_period_elapsed(cvoice->epcm->substream);
+					}
+				}
+				outl(orig_status2, emu->port + IPR2); /* ack all */
+			}
+			status &= ~IPR_P16V;
+		}
+
 		if (status) {
 			unsigned int bits;
-			//snd_printk(KERN_ERR "emu10k1: unhandled interrupt: 0x%08x\n", status);
+			snd_printk(KERN_ERR "emu10k1: unhandled interrupt: 0x%08x\n", status);
 			//make sure any interrupts we don't handle are disabled:
 			bits = INTE_FXDSPENABLE |
 				INTE_PCIERRORENABLE |
@@ -170,20 +197,5 @@ irqreturn_t snd_emu10k1_interrupt(int irq, void *dev_id, struct pt_regs *regs)
 		}
 		outl(orig_status, emu->port + IPR); /* ack all */
 	}
-	if (emu->audigy && emu->revision == 4) { /* P16V */	
-		while ((status2 = inl(emu->port + IPR2)) != 0) {
-			u32 mask = INTE2_PLAYBACK_CH_0_LOOP;  /* Full Loop */
-			emu10k1_voice_t *pvoice = &(emu->p16v_voices[0]);
-			orig_status2 = status2;
-			if(status2 & mask) {
-				if(pvoice->use) {
-					snd_pcm_period_elapsed(pvoice->epcm->substream);
-				} else { 
-					snd_printk(KERN_ERR "p16v: status: 0x%08x, mask=0x%08x, pvoice=%p, use=%d\n", status2, mask, pvoice, pvoice->use);
-				}
-			}
-			outl(orig_status2, emu->port + IPR2); /* ack all */
-		}
-	}
 	return IRQ_RETVAL(handled);
 }