patch-2.2.18 linux/drivers/usb/plusb.c

• Lines: 677
• Date: Sat Oct 14 00:50:03 2000
• Orig file: v2.2.17/drivers/usb/plusb.c
• Orig date: Thu Jan 1 01:00:00 1970

diff -u --new-file --recursive --exclude-from /usr/src/exclude v2.2.17/drivers/usb/plusb.c linux/drivers/usb/plusb.c
@@ -0,0 +1,676 @@
+/*****************************************************************************/
+
+/*
+ *      plusb.c  --  prolific pl-2302 driver.
+ *
+ *      Copyright (C) 2000  Deti Fliegl (deti@fliegl.de)
+ *
+ *      This program is free software; you can redistribute it and/or modify
+ *      it under the terms of the GNU General Public License as published by
+ *      the Free Software Foundation; either version 2 of the License, or
+ *      (at your option) any later version.
+ *
+ *      This program is distributed in the hope that it will be useful,
+ *      but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *      GNU General Public License for more details.
+ *
+ *      You should have received a copy of the GNU General Public License
+ *      along with this program; if not, write to the Free Software
+ *      Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ *
+ *
+ *  $Id: plusb.c,v 1.18 2000/02/14 10:38:58 fliegl Exp $
+ *
+ */
+
+/*****************************************************************************/
+
+#include <linux/module.h>
+#include <linux/socket.h>
+#include <linux/miscdevice.h>
+#include <linux/list.h>
+#include <linux/vmalloc.h>
+#include <linux/slab.h>
+#include <linux/init.h>
+#include <asm/uaccess.h>
+#include <asm/atomic.h>
+#include <linux/delay.h>
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/skbuff.h>
+#define DEBUG
+#include <linux/usb.h>
+
+#include "plusb.h"
+
+/* --------------------------------------------------------------------- */
+
+#define NRPLUSB 4
+
+/*-------------------------------------------------------------------*/
+
+static plusb_t plusb[NRPLUSB];
+
+/* --------------------------------------------------------------------- */
+static int plusb_add_buf_tail (plusb_t *s, struct list_head *dst, struct list_head *src)
+{
+	unsigned long flags;
+	struct list_head *tmp;
+	int ret = 0;
+
+	spin_lock_irqsave (&s->lock, flags);
+
+	if (list_empty (src)) {
+		// no elements in source buffer
+		ret = -1;
+		goto err;
+	}
+	tmp = src->next;
+	list_del (tmp);
+	list_add_tail (tmp, dst);
+
+  err:	spin_unlock_irqrestore (&s->lock, flags);
+	return ret;
+}
+/*-------------------------------------------------------------------*/
+
+static int plusb_my_bulk(plusb_t *s, int pipe, void *data, int size, int *actual_length)
+{
+	int ret;
+
+	dbg("plusb_my_bulk: len:%d",size);
+
+	ret=usb_bulk_msg(s->usbdev, pipe, data, size, actual_length, 500);
+	if(ret<0) {
+		err("plusb: usb_bulk_msg failed(%d)",ret);
+	}
+	
+	if( ret == -EPIPE ) {
+		warn("CLEAR_FEATURE request to remove STALL condition.");
+		if(usb_clear_halt(s->usbdev, usb_pipeendpoint(pipe)))
+			err("request failed");
+		}
+
+	dbg("plusb_my_bulk: finished act: %d", *actual_length);		
+	return ret;
+}
+
+/* --------------------------------------------------------------------- */
+
+static void plusb_bh(void *context)
+{
+	plusb_t *s=context;
+	struct net_device_stats *stats=&s->net_stats;
+	int ret=0;
+	int actual_length;
+	skb_list_t *skb_list;
+	struct sk_buff *skb;
+
+	dbg("plusb_bh: i:%d",in_interrupt());
+
+	while(!list_empty(&s->tx_skb_list)) {
+
+		if(!(s->status&_PLUSB_TXOK))
+			break; 
+		
+		skb_list = list_entry (s->tx_skb_list.next, skb_list_t, skb_list);
+		if(!skb_list->state) {
+			dbg("plusb_bh: not yet ready");
+			schedule();
+			continue;
+		}
+
+		skb=skb_list->skb;
+		ret=plusb_my_bulk(s, usb_sndbulkpipe (s->usbdev, _PLUSB_BULKOUTPIPE),
+		                  skb->data, skb->len, &actual_length);
+	
+		if(ret || skb->len != actual_length ||!(skb->len%64)) {
+			plusb_my_bulk(s, usb_sndbulkpipe (s->usbdev, _PLUSB_BULKOUTPIPE),
+		              NULL, 0, &actual_length);
+		}
+
+		if(!ret) {
+			stats->tx_packets++;
+			stats->tx_bytes+=skb->len;
+                }
+		else {
+			stats->tx_errors++;
+			stats->tx_aborted_errors++;
+		}
+
+		dbg("plusb_bh: dev_kfree_skb");
+
+		dev_kfree_skb(skb);
+		skb_list->state=0;
+		plusb_add_buf_tail (s, &s->free_skb_list, &s->tx_skb_list);	
+	}
+
+	dbg("plusb_bh: finished");
+	s->in_bh=0;
+}
+
+/* --------------------------------------------------------------------- */
+
+static int plusb_net_xmit(struct sk_buff *skb, struct net_device *dev)
+{
+	plusb_t *s=dev->priv;
+	skb_list_t *skb_list;
+	int ret=NET_XMIT_SUCCESS;
+
+	dbg("plusb_net_xmit: len:%d i:%d",skb->len,in_interrupt());
+
+        if(!s->connected || list_empty(&s->free_skb_list)) {
+		ret=NET_XMIT_CN;
+		goto lab;
+	}	
+
+	plusb_add_buf_tail (s, &s->tx_skb_list, &s->free_skb_list);
+	skb_list = list_entry (s->tx_skb_list.prev, skb_list_t, skb_list);
+	skb_list->skb=skb;
+	skb_list->state=1;
+
+lab:
+	if(s->in_bh)
+		return ret;
+
+	dbg("plusb_net_xmit: queue_task");
+
+	s->in_bh=1;
+	queue_task(&s->bh, &tq_scheduler);
+
+	dbg("plusb_net_xmit: finished");
+	return ret;
+
+}
+
+/* --------------------------------------------------------------------- */
+
+static void plusb_bulk_complete(urb_t *purb)
+{
+	plusb_t *s=purb->context;
+
+	dbg("plusb_bulk_complete: status:%d length:%d",purb->status,purb->actual_length);
+	if(!s->connected)
+		return;
+
+	if( !purb->status) {
+		struct sk_buff *skb;
+		unsigned char *dst;
+		int len=purb->transfer_buffer_length;
+		struct net_device_stats *stats=&s->net_stats;
+
+		skb=dev_alloc_skb(len);
+
+		if(!skb) {
+			err("plusb_bulk_complete: dev_alloc_skb(%d)=NULL, dropping frame",len);
+			stats->rx_dropped++;
+			return;
+		}
+
+		dst=(char *)skb_put(skb, len);
+		memcpy( dst, purb->transfer_buffer, len);
+
+		skb->dev=&s->net_dev;
+		skb->protocol=eth_type_trans(skb, skb->dev);
+		stats->rx_packets++;
+		stats->rx_bytes+=len;
+		netif_rx(skb);
+	}
+	else
+		purb->status=0;
+}
+
+/* --------------------------------------------------------------------- */
+
+static void plusb_int_complete(urb_t *purb)
+{
+	plusb_t *s=purb->context;
+	s->status=((unsigned char*)purb->transfer_buffer)[0]&255;
+#if 0
+	if((s->status&0x3f)!=0x20) {
+		warn("invalid device status %02X", s->status);
+		return;
+	}
+#endif	
+	if(!s->connected)
+		return;
+
+	if(s->status&_PLUSB_RXD) {
+		int ret;
+		
+		if(s->bulkurb->status) {
+			err("plusb_int_complete: URB still in use");
+			return;
+		}
+		
+		ret=usb_submit_urb(s->bulkurb);
+		if(ret && ret!=-EBUSY) {
+			err("plusb_int_complete: usb_submit_urb failed");
+		}
+	}
+		
+	if(purb->status || s->status!=160)
+		dbg("status: %p %d buf: %02X", purb->dev, purb->status, s->status);
+}
+
+/* --------------------------------------------------------------------- */
+
+static void plusb_free_all(plusb_t *s)
+{
+	struct list_head *skb;
+	skb_list_t *skb_list;
+	
+	dbg("plusb_free_all");
+	run_task_queue(&tq_immediate);	
+
+	if(s->inturb) {
+		dbg("unlink inturb");
+		usb_unlink_urb(s->inturb);
+	}
+
+	if(s->inturb && s->inturb->transfer_buffer) {
+		dbg("kfree inturb->transfer_buffer");
+		kfree(s->inturb->transfer_buffer);
+		s->inturb->transfer_buffer=NULL;
+	}
+	
+	if(s->inturb) {
+		dbg("free_urb inturb");
+		usb_free_urb(s->inturb);
+		s->inturb=NULL;
+	}
+
+	if(s->bulkurb) {
+		dbg("unlink bulkurb");
+		usb_unlink_urb(s->bulkurb);
+	}
+	
+	if(s->bulkurb && s->bulkurb->transfer_buffer) {
+		dbg("kfree bulkurb->transfer_buffer");
+		kfree(s->bulkurb->transfer_buffer);
+		s->bulkurb->transfer_buffer=NULL;
+	}
+	if(s->bulkurb) {
+		dbg("free_urb bulkurb");
+		usb_free_urb(s->bulkurb);
+		s->bulkurb=NULL;
+	}
+	
+	while(!list_empty(&s->free_skb_list)) {
+		skb=s->free_skb_list.next;
+		list_del(skb);
+		skb_list = list_entry (skb, skb_list_t, skb_list);
+		kfree(skb_list);
+	}
+
+	while(!list_empty(&s->tx_skb_list)) {
+		skb=s->tx_skb_list.next;
+		list_del(skb);
+		skb_list = list_entry (skb, skb_list_t, skb_list);
+		kfree(skb_list);	
+	}
+	dbg("plusb_free_all: finished");	
+}
+
+/*-------------------------------------------------------------------*/
+
+static int plusb_alloc(plusb_t *s)
+{
+	int i;
+	skb_list_t *skb;
+
+	dbg("plusb_alloc");
+	
+	for(i=0 ; i < _SKB_NUM ; i++) {
+		skb=kmalloc(sizeof(skb_list_t), GFP_KERNEL);
+		if(!skb) {
+			err("kmalloc for skb_list failed");
+			goto reject;
+		}
+		memset(skb, 0, sizeof(skb_list_t));
+		list_add(&skb->skb_list, &s->free_skb_list);
+	}
+
+	dbg("inturb allocation:");
+	s->inturb=usb_alloc_urb(0);
+	if(!s->inturb) {
+		err("alloc_urb failed");
+		goto reject;
+	}
+
+	dbg("bulkurb allocation:");	
+	s->bulkurb=usb_alloc_urb(0);
+	if(!s->bulkurb) {
+		err("alloc_urb failed");
+		goto reject;
+	}
+	
+	dbg("bulkurb/inturb init:");
+	s->inturb->dev=s->usbdev;
+	s->inturb->pipe=usb_rcvintpipe (s->usbdev, _PLUSB_INTPIPE);
+	s->inturb->transfer_buffer=kmalloc(64, GFP_KERNEL);
+	if(!s->inturb->transfer_buffer) {
+		err("kmalloc failed");
+		goto reject;
+	}
+	
+	s->inturb->transfer_buffer_length=1;
+	s->inturb->complete=plusb_int_complete;
+	s->inturb->context=s;
+	s->inturb->interval=10;
+
+	dbg("inturb submission:");
+	if(usb_submit_urb(s->inturb)<0) {
+		err("usb_submit_urb failed");
+		goto reject;
+	}
+
+	dbg("bulkurb init:");
+	s->bulkurb->dev=s->usbdev;
+	s->bulkurb->pipe=usb_rcvbulkpipe (s->usbdev, _PLUSB_BULKINPIPE);
+	s->bulkurb->transfer_buffer=kmalloc(_BULK_DATA_LEN, GFP_KERNEL);
+	if(!s->bulkurb->transfer_buffer) {
+		err("kmalloc failed");
+		goto reject;
+	}
+	
+	s->bulkurb->transfer_buffer_length=_BULK_DATA_LEN;
+	s->bulkurb->complete=plusb_bulk_complete;
+	s->bulkurb->context=s;
+	
+	dbg("plusb_alloc: finished");
+	
+	return 0;
+
+  reject:
+  	dbg("plusb_alloc: failed");
+	
+	plusb_free_all(s);
+	return -ENOMEM;
+}
+
+/*-------------------------------------------------------------------*/
+
+static int plusb_net_open(struct net_device *dev)
+{
+	plusb_t *s=dev->priv;
+	
+	dbg("plusb_net_open");
+	
+	if(plusb_alloc(s))
+		return -ENOMEM;
+
+	s->opened=1;
+	MOD_INC_USE_COUNT;
+	
+	dbg("plusb_net_open: success");
+	
+	return 0;
+	
+}
+
+/* --------------------------------------------------------------------- */
+
+static int plusb_net_stop(struct net_device *dev)
+{
+	plusb_t *s=dev->priv;
+	
+	dbg("plusb_net_stop");	
+	
+	plusb_free_all(s);
+	s->opened=0;
+	MOD_DEC_USE_COUNT;
+	dbg("plusb_net_stop:finished");
+	return 0;
+}
+
+/* --------------------------------------------------------------------- */
+
+static struct net_device_stats *plusb_net_get_stats(struct net_device *dev)
+{
+	plusb_t *s=dev->priv;
+	
+	dbg("net_device_stats");
+	
+	return &s->net_stats;
+}
+
+/* --------------------------------------------------------------------- */
+
+static plusb_t *plusb_find_struct (void)
+{
+	int u;
+
+	for (u = 0; u < NRPLUSB; u++) {
+		plusb_t *s = &plusb[u];
+		if (!s->connected)
+			return s;
+	}
+	return NULL;
+}
+
+/* --------------------------------------------------------------------- */
+
+static void plusb_disconnect (struct usb_device *usbdev, void *ptr)
+{
+	plusb_t *s = ptr;
+
+	printk ("plusb_net_disconnect: Starting\n");
+	
+	dbg("plusb_disconnect");
+	
+	s->connected = 0;
+	
+	plusb_free_all(s);
+
+	if(!s->opened && s->net_dev.name) {
+		dbg("unregistering netdev: %s",s->net_dev.name);
+		unregister_netdev(&s->net_dev);
+		s->net_dev.name[0] = '\0';
+#if (LINUX_VERSION_CODE < 0x020300)		
+		kfree (s->net_dev.name);
+		s->net_dev.name = NULL;
+#endif
+	}
+	
+	dbg("plusb_disconnect: finished");
+	
+	printk ("plusb_net_disconnect: Finished\n");
+	
+	MOD_DEC_USE_COUNT;
+}
+
+/* --------------------------------------------------------------------- */
+
+int plusb_net_init(struct net_device *dev)
+{
+	dbg("plusb_net_init");
+	
+	dev->open=plusb_net_open;
+	dev->stop=plusb_net_stop;
+	dev->hard_start_xmit=plusb_net_xmit;
+	dev->get_stats	= plusb_net_get_stats;
+	ether_setup(dev);
+	dev->tx_queue_len = 0;
+	dev->flags = IFF_POINTOPOINT|IFF_NOARP;
+
+	
+	dbg("plusb_net_init: finished");
+	return 0;
+}
+
+/* --------------------------------------------------------------------- */
+
+static void *plusb_probe (struct usb_device *usbdev, unsigned int ifnum)
+{
+	plusb_t *s;
+
+	printk ("plusb_probe: Starting\n");
+
+	if (usbdev) {
+		printk("plusb: probe: vendor id 0x%x, device id 0x%x ifnum:%d\n",
+		    usbdev->descriptor.idVendor, usbdev->descriptor.idProduct, ifnum);
+	} else {
+		printk ("plusb: usbdev is NULL!\n");
+	}
+
+	if (usbdev->descriptor.idVendor != 0x067b || usbdev->descriptor.idProduct > 0x1)
+		return NULL;
+
+	/* We don't handle multiple configurations */
+	if (usbdev->descriptor.bNumConfigurations != 1)
+		return NULL;
+
+	printk ("plusb_probe: Looking for Struct\n");
+	s = plusb_find_struct ();
+	if (!s)
+		return NULL;
+
+	s->usbdev = usbdev;
+
+	printk ("plusb_probe: Setting Configuration\n");
+	if (usb_set_configuration (s->usbdev, usbdev->config[0].bConfigurationValue) < 0) {
+		err("set_configuration failed");
+		return NULL;
+	}
+
+	printk ("plusb_probe: Setting Interface\n");	
+	if (usb_set_interface (s->usbdev, 0, 0) < 0) {
+		err("set_interface failed");
+		return NULL;
+	}
+
+	printk ("plusb_probe: Checking device name\n");
+	
+#if (LINUX_VERSION_CODE < 0x020300)
+	{
+		int i;
+		
+		/* EZA: find the device number... we seem to have lost it...*/
+		for (i=0; i<NRPLUSB; i++) {
+			if (&plusb[i] == s)
+				break;
+		}
+	
+		/* EZA: for Kernel version 2.2, the driver is responsible for
+		   allocating this memory. For version 2.4, the rules
+		   have apparently changed, but there is a nifty function
+		   'init_netdev' that might make this easier...  It's in 
+		   ../net/net_init.c - but can we get there from here?  (no)
+		*/
+		if(!s->net_dev.name) {
+			s->net_dev.name = kmalloc(strlen("plusbXXXX"), GFP_KERNEL);
+			sprintf (s->net_dev.name, "plusb%d", i);
+			s->net_dev.init=plusb_net_init;
+			s->net_dev.priv=s;
+			
+			printk ("plusb_probe: Registering Device\n");	
+			if(!register_netdev(&s->net_dev))
+				info("registered: %s", s->net_dev.name);
+			else {
+				err("register_netdev failed");
+				s->net_dev.name[0] = '\0';
+			}
+			printk ("plusb_probe: Connected!\n");
+		}
+	}
+#else
+	/* Kernel version 2.3+ works a little bit differently  */
+	if(!s->net_dev.name[0]) {
+		strcpy(s->net_dev.name, "plusb%d");
+		s->net_dev.init=plusb_net_init;
+		s->net_dev.priv=s;
+		if(!register_netdev(&s->net_dev))
+			info("registered: %s", s->net_dev.name);
+		else {
+			err("register_netdev failed");
+			s->net_dev.name[0] = '\0';
+		}
+	}
+	
+#endif
+	s->connected = 1;
+	printk ("plusb_probe: Set Connected\n");		
+
+	if(s->opened) {
+		dbg("net device already allocated, restarting USB transfers");
+		plusb_alloc(s);
+	}
+
+	info("bound to interface: %d dev: %p", ifnum, usbdev);
+	MOD_INC_USE_COUNT;
+	return s;
+}
+/* --------------------------------------------------------------------- */
+
+static struct usb_driver plusb_driver =
+{
+	name: "plusb",
+	probe: plusb_probe,
+	disconnect: plusb_disconnect,
+};
+
+/* --------------------------------------------------------------------- */
+
+static int __init plusb_init (void)
+{
+	unsigned u;
+	
+	dbg("plusb_init");
+	
+	/* initialize struct */
+	for (u = 0; u < NRPLUSB; u++) {
+		plusb_t *s;
+		dbg("plusb_init: u=%ud about to assign s\n", u);
+		s= &plusb[u];
+		dbg("plusb_init: u=%ud about to memset\n", u);
+		memset (s, 0, sizeof (plusb_t));
+		s->bh.routine = (void (*)(void *))plusb_bh;
+		s->bh.data = s;
+		dbg("plusb_init: u=%ud about to init list head\n", u);
+		INIT_LIST_HEAD (&s->tx_skb_list);
+		INIT_LIST_HEAD (&s->free_skb_list);
+		dbg("plusb_init: u=%ud about to init spin lock\n", u);
+		spin_lock_init (&s->lock);
+	}
+	
+	dbg ("plusb_init: Initialized structure\n");
+	
+	/* register misc device */
+	usb_register (&plusb_driver);
+
+	dbg("plusb_init: driver registered");
+
+	return 0;
+}
+
+/* --------------------------------------------------------------------- */
+
+static void __exit plusb_cleanup (void)
+{
+	unsigned u;
+
+	dbg("plusb_cleanup");
+	for (u = 0; u < NRPLUSB; u++) {
+		plusb_t *s = &plusb[u];
+		if(s->net_dev.name[0]) {
+			dbg("unregistering netdev: %s",s->net_dev.name);
+			unregister_netdev(&s->net_dev);
+		}
+	}
+	usb_deregister (&plusb_driver);
+	dbg("plusb_cleanup: finished");
+}
+
+/* --------------------------------------------------------------------- */
+
+MODULE_AUTHOR ("Deti Fliegl, deti@fliegl.de");
+MODULE_DESCRIPTION ("PL-2302 USB Interface Driver for Linux (c)2000");
+
+
+module_init (plusb_init);
+module_exit (plusb_cleanup);
+
+/* --------------------------------------------------------------------- */