patch-2.2.7 linux/drivers/usb/audio.c

• Lines: 127
• Date: Wed Apr 28 11:14:03 1999
• Orig file: v2.2.6/linux/drivers/usb/audio.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.2.6/linux/drivers/usb/audio.c linux/drivers/usb/audio.c
@@ -0,0 +1,126 @@
+#include <linux/kernel.h>
+#include <linux/malloc.h>
+#include <linux/string.h>
+#include <linux/timer.h>
+#include <linux/sched.h>
+#include "usb.h"
+
+static int usb_audio_probe(struct usb_device *dev);
+static void usb_audio_disconnect(struct usb_device *dev);
+static LIST_HEAD(usb_audio_list);
+
+struct usb_audio
+{
+	struct usb_device *dev;
+	struct list_head list;
+};
+
+static struct usb_driver usb_audio_driver =
+{
+	"audio",
+	usb_audio_probe,
+	usb_audio_disconnect,
+	{NULL, NULL}
+};
+
+
+static int usb_audio_irq(int state, void *buffer, void *dev_id)
+{
+	struct usb_audio *aud = (struct usb_audio*) dev_id;
+	return 1;
+}
+
+static int usb_audio_probe(struct usb_device *dev)
+{
+	struct usb_interface_descriptor *interface;
+	struct usb_endpoint_descriptor *endpoint;
+	struct usb_audio *aud;
+
+	int i;
+	int na=0;
+	
+	interface = &dev->config[0].interface[0];
+
+	for(i=0;i<dev->config[0].bNumInterfaces;i++)
+	{
+		int x;
+		
+		endpoint = &interface->endpoint[i];
+
+		if(interface->bInterfaceClass != 1) 
+	        	continue;
+
+		printk(KERN_INFO "USB audio device detected.\n");
+	
+		switch(interface->bInterfaceSubClass)
+		{
+			case 0x01:
+				printk(KERN_INFO "audio: Control device.\n");
+				break;
+			case 0x02:
+				printk(KERN_INFO "audio: streaming.\n");
+				break;
+			case 0x03:
+				printk(KERN_INFO "audio: nonstreaming.\n");
+				break;
+		}
+		na++;
+	}
+	
+	if(na==0)
+		return -1;
+
+	aud = kmalloc(sizeof(struct usb_audio), GFP_KERNEL);
+	if(aud)
+	{
+        	memset(aud, 0, sizeof(*aud));
+        	aud->dev = dev;
+        	dev->private = aud;
+
+		endpoint = &interface->endpoint[0];
+
+//        	usb_set_configuration(dev, dev->config[0].bConfigurationValue);
+//        	usb_set_protocol(dev, 0);
+//        	usb_set_idle(dev, 0, 0);
+        
+        	usb_request_irq(dev,
+                        usb_rcvctrlpipe(dev, endpoint->bEndpointAddress),
+                        usb_audio_irq,
+                        endpoint->bInterval,
+                        aud);
+
+		list_add(&aud->list, &usb_audio_list);
+	}
+	return 0;
+}
+
+static void usb_audio_disconnect(struct usb_device *dev)
+{
+	struct usb_audio *aud = (struct usb_audio*) dev->private;
+	if(aud)
+	{
+        	dev->private = NULL;
+        	list_del(&aud->list);
+        	kfree(aud);
+	}
+	printk(KERN_INFO "USB audio driver removed.\n");
+}
+
+int usb_audio_init(void)
+{
+	usb_register(&usb_audio_driver);
+	return 0;
+}
+
+/*
+ *	Support functions for parsing
+ */
+ 
+void usb_audio_interface(struct usb_interface_descriptor *interface, u8 *data)
+{
+}
+
+void usb_audio_endpoint(struct usb_endpoint_descriptor *interface, u8 *data)
+{
+}
+