drivers/usb/atm/usbatm.h

   1 /******************************************************************************
   2  *  usbatm.h - Generic USB xDSL driver core
   3  *
   4  *  Copyright (C) 2001, Alcatel
   5  *  Copyright (C) 2003, Duncan Sands, SolNegro, Josep Comas
   6  *  Copyright (C) 2004, David Woodhouse
   7  *
   8  *  This program is free software; you can redistribute it and/or modify it
   9  *  under the terms of the GNU General Public License as published by the Free
  10  *  Software Foundation; either version 2 of the License, or (at your option)
  11  *  any later version.
  12  *
  13  *  This program is distributed in the hope that it will be useful, but WITHOUT
  14  *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  15  *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  16  *  more details.
  17  *
  18  *  You should have received a copy of the GNU General Public License along with
  19  *  this program; if not, write to the Free Software Foundation, Inc., 59
  20  *  Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  21  *
  22  ******************************************************************************/
  23
  24 #ifndef _USBATM_H_
  25 #define _USBATM_H_
  26
  27 #include <asm/semaphore.h>
  28 #include <linux/atm.h>
  29 #include <linux/atmdev.h>
  30 #include <linux/completion.h>
  31 #include <linux/device.h>
  32 #include <linux/kernel.h>
  33 #include <linux/kref.h>
  34 #include <linux/list.h>
  35 #include <linux/stringify.h>
  36 #include <linux/usb.h>
  37
  38 /*
  39 #define VERBOSE_DEBUG
  40 */
  41
  42 #ifdef DEBUG
  43 #define UDSL_ASSERT(x)  BUG_ON(!(x))
  44 #else
  45 #define UDSL_ASSERT(x)  do { if (!(x)) warn("failed assertion '%s' at line %d", __stringify(x), __LINE__); } while(0)
  46 #endif
  47
  48 #define usb_err(instance, format, arg...)       \
  49         dev_err(&(instance)->usb_intf->dev , format , ## arg)
  50 #define usb_info(instance, format, arg...)      \
  51         dev_info(&(instance)->usb_intf->dev , format , ## arg)
  52 #define usb_warn(instance, format, arg...)      \
  53         dev_warn(&(instance)->usb_intf->dev , format , ## arg)
  54 #ifdef DEBUG
  55 #define usb_dbg(instance, format, arg...)       \
  56         dev_printk(KERN_DEBUG , &(instance)->usb_intf->dev , format , ## arg)
  57 #else
  58 #define usb_dbg(instance, format, arg...)       \
  59         do {} while (0)
  60 #endif
  61
  62 /* FIXME: move to dev_* once ATM is driver model aware */
  63 #define atm_printk(level, instance, format, arg...)     \
  64         printk(level "ATM dev %d: " format ,            \
  65         (instance)->atm_dev->number , ## arg)
  66
  67 #define atm_err(instance, format, arg...)       \
  68         atm_printk(KERN_ERR, instance , format , ## arg)
  69 #define atm_info(instance, format, arg...)      \
  70         atm_printk(KERN_INFO, instance , format , ## arg)
  71 #define atm_warn(instance, format, arg...)      \
  72         atm_printk(KERN_WARNING, instance , format , ## arg)
  73 #ifdef DEBUG
  74 #define atm_dbg(instance, format, arg...)       \
  75         atm_printk(KERN_DEBUG, instance , format , ## arg)
  76 #define atm_rldbg(instance, format, arg...)     \
  77         if (printk_ratelimit())                         \
  78                 atm_printk(KERN_DEBUG, instance , format , ## arg)
  79 #else
  80 #define atm_dbg(instance, format, arg...)       \
  81         do {} while (0)
  82 #define atm_rldbg(instance, format, arg...)     \
  83         do {} while (0)
  84 #endif
  85
  86
  87 /* flags, set by mini-driver in bind() */
  88
  89 #define UDSL_SKIP_HEAVY_INIT    (1<<0)
  90
  91
  92 /* mini driver */
  93
  94 struct usbatm_data;
  95
  96 /*
  97 *  Assuming all methods exist and succeed, they are called in this order:
  98 *
  99 *       bind, heavy_init, atm_start, ..., atm_stop, unbind
 100 */
 101
 102 struct usbatm_driver {
 103         const char *driver_name;
 104
 105         /* init device ... can sleep, or cause probe() failure */
 106         int (*bind) (struct usbatm_data *, struct usb_interface *,
 107                      const struct usb_device_id *id);
 108
 109         /* additional device initialization that is too slow to be done in probe() */
 110         int (*heavy_init) (struct usbatm_data *, struct usb_interface *);
 111
 112         /* cleanup device ... can sleep, but can't fail */
 113         void (*unbind) (struct usbatm_data *, struct usb_interface *);
 114
 115         /* init ATM device ... can sleep, or cause ATM initialization failure */
 116         int (*atm_start) (struct usbatm_data *, struct atm_dev *);
 117
 118         /* cleanup ATM device ... can sleep, but can't fail */
 119         void (*atm_stop) (struct usbatm_data *, struct atm_dev *);
 120
 121         int in;         /* rx endpoint */
 122         int out;        /* tx endpoint */
 123
 124         unsigned rx_padding;
 125         unsigned tx_padding;
 126 };
 127
 128 extern int usbatm_usb_probe(struct usb_interface *intf, const struct usb_device_id *id,
 129                 struct usbatm_driver *driver);
 130 extern void usbatm_usb_disconnect(struct usb_interface *intf);
 131
 132
 133 struct usbatm_channel {
 134         int endpoint;                   /* usb pipe */
 135         unsigned int stride;            /* ATM cell size + padding */
 136         unsigned int buf_size;          /* urb buffer size */
 137         spinlock_t lock;
 138         struct list_head list;
 139         struct tasklet_struct tasklet;
 140         struct timer_list delay;
 141         struct usbatm_data *usbatm;
 142 };
 143
 144 /* main driver data */
 145
 146 struct usbatm_data {
 147         /******************
 148         *  public fields  *
 149         ******************/
 150
 151         /* mini driver */
 152         struct usbatm_driver *driver;
 153         void *driver_data;
 154         char driver_name[16];
 155         unsigned int flags; /* set by mini-driver in bind() */
 156
 157         /* USB device */
 158         struct usb_device *usb_dev;
 159         struct usb_interface *usb_intf;
 160         char description[64];
 161
 162         /* ATM device */
 163         struct atm_dev *atm_dev;
 164
 165         /********************************
 166         *  private fields - do not use  *
 167         ********************************/
 168
 169         struct kref refcount;
 170         struct semaphore serialize;
 171         int disconnected;
 172
 173         /* heavy init */
 174         int thread_pid;
 175         struct completion thread_started;
 176         struct completion thread_exited;
 177
 178         /* ATM device */
 179         struct list_head vcc_list;
 180
 181         struct usbatm_channel rx_channel;
 182         struct usbatm_channel tx_channel;
 183
 184         struct sk_buff_head sndqueue;
 185         struct sk_buff *current_skb;    /* being emptied */
 186
 187         struct urb *urbs[0];
 188 };
 189
 190 #endif  /* _USBATM_H_ */