From c59bba75fa500f13ef14215d599ee0d7faa1b954 Mon Sep 17 00:00:00 2001 From: Duncan Sands Date: Wed, 11 May 2005 20:24:03 +0200 Subject: [PATCH] USB ATM: new usbatm core Rework the core usbatm code: minidrivers (i.e. drivers for particular modems) now register themselves with the usbatm core, supplying methods for binding/unbinding etc. The design was inspired by usb-serial and usbnet. At the same time, more common code from the speedtch and cxacru (patch 3/5) drivers was generalized and moved into the core. The transmission and reception parts have been unified and simplified. Since this is a major change and I don't like underscores in file names, usb_atm.[ch] has been renamed usbatm.[ch]. Many thanks to Roman Kagan, who did a lot of the coding. Signed-off-by: Duncan Sands Signed-off-by: Greg Kroah-Hartman --- drivers/usb/atm/usbatm.h | 183 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 183 insertions(+) create mode 100644 drivers/usb/atm/usbatm.h (limited to 'drivers/usb/atm/usbatm.h') diff --git a/drivers/usb/atm/usbatm.h b/drivers/usb/atm/usbatm.h new file mode 100644 index 00000000000..2239804453c --- /dev/null +++ b/drivers/usb/atm/usbatm.h @@ -0,0 +1,183 @@ +/****************************************************************************** + * usbatm.h - Generic USB xDSL driver core + * + * Copyright (C) 2001, Alcatel + * Copyright (C) 2003, Duncan Sands, SolNegro, Josep Comas + * Copyright (C) 2004, David Woodhouse + * + * 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., 59 + * Temple Place - Suite 330, Boston, MA 02111-1307, USA. + * + ******************************************************************************/ + +#ifndef _USBATM_H_ +#define _USBATM_H_ + +#include + +/* +#define DEBUG +#define VERBOSE_DEBUG +*/ + +#if !defined (DEBUG) && defined (CONFIG_USB_DEBUG) +# define DEBUG +#endif + +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#ifdef DEBUG +#define UDSL_ASSERT(x) BUG_ON(!(x)) +#else +#define UDSL_ASSERT(x) do { if (!(x)) warn("failed assertion '%s' at line %d", __stringify(x), __LINE__); } while(0) +#endif + +#define usb_err(instance, format, arg...) \ + dev_err(&(instance)->usb_intf->dev , format , ## arg) +#define usb_info(instance, format, arg...) \ + dev_info(&(instance)->usb_intf->dev , format , ## arg) +#define usb_warn(instance, format, arg...) \ + dev_warn(&(instance)->usb_intf->dev , format , ## arg) +#define usb_dbg(instance, format, arg...) \ + dev_dbg(&(instance)->usb_intf->dev , format , ## arg) + +/* FIXME: move to dev_* once ATM is driver model aware */ +#define atm_printk(level, instance, format, arg...) \ + printk(level "ATM dev %d: " format , (instance)->atm_dev->number, ## arg) + +#define atm_err(instance, format, arg...) \ + atm_printk(KERN_ERR, instance , format , ## arg) +#define atm_info(instance, format, arg...) \ + atm_printk(KERN_INFO, instance , format , ## arg) +#define atm_warn(instance, format, arg...) \ + atm_printk(KERN_WARNING, instance , format , ## arg) +#ifdef DEBUG +#define atm_dbg(instance, format, arg...) \ + atm_printk(KERN_DEBUG, instance , format , ## arg) +#else +#define atm_dbg(instance, format, arg...) \ + do {} while (0) +#endif + + +/* mini driver */ + +struct usbatm_data; + +/* +* Assuming all methods exist and succeed, they are called in this order: +* +* bind, heavy_init, atm_start, ..., atm_stop, unbind +*/ + +struct usbatm_driver { + struct module *owner; + + const char *driver_name; + + /* + * init device ... can sleep, or cause probe() failure. Drivers with a heavy_init + * method can avoid having it called by setting need_heavy_init to zero. + */ + int (*bind) (struct usbatm_data *, struct usb_interface *, + const struct usb_device_id *id, int *need_heavy_init); + + /* additional device initialization that is too slow to be done in probe() */ + int (*heavy_init) (struct usbatm_data *, struct usb_interface *); + + /* cleanup device ... can sleep, but can't fail */ + void (*unbind) (struct usbatm_data *, struct usb_interface *); + + /* init ATM device ... can sleep, or cause ATM initialization failure */ + int (*atm_start) (struct usbatm_data *, struct atm_dev *); + + /* cleanup ATM device ... can sleep, but can't fail */ + void (*atm_stop) (struct usbatm_data *, struct atm_dev *); + + int in; /* rx endpoint */ + int out; /* tx endpoint */ + + unsigned rx_padding; + unsigned tx_padding; +}; + +extern int usbatm_usb_probe(struct usb_interface *intf, const struct usb_device_id *id, + struct usbatm_driver *driver); +extern void usbatm_usb_disconnect(struct usb_interface *intf); + + +struct usbatm_channel { + int endpoint; /* usb pipe */ + unsigned int stride; /* ATM cell size + padding */ + unsigned int buf_size; /* urb buffer size */ + spinlock_t lock; + struct list_head list; + struct tasklet_struct tasklet; + struct timer_list delay; + struct usbatm_data *usbatm; +}; + +/* main driver data */ + +struct usbatm_data { + /****************** + * public fields * + ******************/ + + /* mini driver */ + struct usbatm_driver *driver; + void *driver_data; + char driver_name[16]; + + /* USB device */ + struct usb_device *usb_dev; + struct usb_interface *usb_intf; + char description[64]; + + /* ATM device */ + struct atm_dev *atm_dev; + + /******************************** + * private fields - do not use * + ********************************/ + + struct kref refcount; + struct semaphore serialize; + + /* heavy init */ + int thread_pid; + struct completion thread_started; + struct completion thread_exited; + + /* ATM device */ + struct list_head vcc_list; + + struct usbatm_channel rx_channel; + struct usbatm_channel tx_channel; + + struct sk_buff_head sndqueue; + struct sk_buff *current_skb; /* being emptied */ + + struct urb *urbs[0]; +}; + +#endif /* _USBATM_H_ */ -- cgit v1.2.3