diff -ru linux-2.4.17.ori/drivers/sound/es1371.c linux-2.4.17/drivers/sound/es1371.c
--- linux-2.4.17.ori/drivers/sound/es1371.c	Sun Sep 30 16:26:08 2001
+++ linux-2.4.17/drivers/sound/es1371.c	Wed Jan  9 20:53:58 2002
@@ -110,6 +110,8 @@
  *    31.01.2001   0.30  Register/Unregister gameport
  *                       Fix SETTRIGGER non OSS API conformity
  *    14.07.2001   0.31  Add list of laptops needing amplifier control
+ *    08.01.2002   0.32  Add /proc/driver/es1371/{card}/ac97 entry
+ *                       Salvador E. Tropea <salvador@inti.gov.ar>
  */
 
 /*****************************************************************************/
@@ -2794,6 +2796,9 @@
 };
 
 
+static char driver_str[] = "driver/es1371";
+static char ac97_str[] = "/ac97";
+
 static int __devinit es1371_probe(struct pci_dev *pcidev, const struct pci_device_id *pciid)
 {
 	struct es1371_state *s;
@@ -2803,6 +2808,8 @@
 	unsigned long tmo;
 	signed long tmo2;
 	unsigned int cssr;
+	char *proc_str;
+	int proc_success = 0;
 
 	if ((res=pci_enable_device(pcidev)))
 		return res;
@@ -2961,6 +2968,22 @@
 		val = initvol[i].vol;
 		mixdev_ioctl(&s->codec, initvol[i].mixch, (unsigned long)&val);
 	}
+
+	/* create a proc entry to inform about the codec facilities */
+	proc_str = (char *)vmalloc(sizeof(driver_str) + sizeof(ac97_str) +
+		strlen(s->dev->slot_name));
+	if (proc_mkdir(driver_str, 0)) {
+		sprintf(proc_str, "%s/%s", driver_str, s->dev->slot_name);
+		if (proc_mkdir(proc_str, 0)) {
+			strcat(proc_str, ac97_str);
+			if (create_proc_read_entry(proc_str, 0, 0, ac97_read_proc, &s->codec))
+				proc_success = 1;
+		}
+	}
+	vfree(proc_str);
+	if (!proc_success)
+		printk(KERN_WARNING PFX "cannot create /proc entry\n");
+
 	/* mute master and PCM when in S/PDIF mode */
 	if (s->spdif_volume != -1) {
 		val = 0x0000;
@@ -3003,6 +3026,7 @@
 static void __devinit es1371_remove(struct pci_dev *dev)
 {
 	struct es1371_state *s = pci_get_drvdata(dev);
+	char *proc_str;
 
 	if (!s)
 		return;
@@ -3011,6 +3035,17 @@
 	if (s->ps)
 		remove_proc_entry("es1371", NULL);
 #endif /* ES1371_DEBUG */
+
+	/* remove the proc entry */
+	proc_str = (char *)vmalloc(sizeof(driver_str) + sizeof(ac97_str) +
+		strlen(s->dev->slot_name));
+	sprintf(proc_str, "%s/%s%s", driver_str, s->dev->slot_name, ac97_str);
+	remove_proc_entry(proc_str, NULL);
+	sprintf(proc_str, "%s/%s", driver_str, s->dev->slot_name);
+	remove_proc_entry(proc_str, NULL);
+	remove_proc_entry(driver_str, NULL);
+	vfree(proc_str);
+
 	outl(0, s->io+ES1371_REG_CONTROL); /* switch everything off */
 	outl(0, s->io+ES1371_REG_SERIAL_CONTROL); /* clear serial interrupts */
 	synchronize_irq();