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 <linux/atm.h>
  28 #include <linux/atmdev.h>
  29 #include <linux/completion.h>
  30 #include <linux/device.h>
  31 #include <linux/kernel.h>
  32 #include <linux/kref.h>
  33 #include <linux/list.h>
  34 #include <linux/stringify.h>
  35 #include <linux/usb.h>
  36 #include <linux/mutex.h>
  37
  38 /*
  39 #define VERBOSE_DEBUG
  40 */
  41
  42 #ifdef DEBUG
  43 #define UDSL_ASSERT(instance, x)        BUG_ON(!(x))
  44 #else
  45 #define UDSL_ASSERT(instance, x)                                        \
  46         do {    \
  47                 if (!(x))                                               \
  48                         dev_warn(&(instance)->usb_intf->dev,            \
  49                                  "failed assertion '%s' at line %d",    \
  50                                  __stringify(x), __LINE__);             \
  51         } while (0)
  52 #endif
  53
  54 #define usb_err(instance, format, arg...)       \
  55         dev_err(&(instance)->usb_intf->dev , format , ## arg)
  56 #define usb_info(instance, format, arg...)      \
  57         dev_info(&(instance)->usb_intf->dev , format , ## arg)
  58 #define usb_warn(instance, format, arg...)      \
  59         dev_warn(&(instance)->usb_intf->dev , format , ## arg)
  60 #ifdef DEBUG
  61 #define usb_dbg(instance, format, arg...)       \
  62         dev_printk(KERN_DEBUG , &(instance)->usb_intf->dev , format , ## arg)
  63 #else
  64 #define usb_dbg(instance, format, arg...)       \
  65         do {} while (0)
  66 #endif
  67
  68 /* FIXME: move to dev_* once ATM is driver model aware */
  69 #define atm_printk(level, instance, format, arg...)     \
  70         printk(level "ATM dev %d: " format ,            \
  71         (instance)->atm_dev->number , ## arg)
  72
  73 #define atm_err(instance, format, arg...)       \
  74         atm_printk(KERN_ERR, instance , format , ## arg)
  75 #define atm_info(instance, format, arg...)      \
  76         atm_printk(KERN_INFO, instance , format , ## arg)
  77 #define atm_warn(instance, format, arg...)      \
  78         atm_printk(KERN_WARNING, instance , format , ## arg)
  79 #ifdef DEBUG
  80 #define atm_dbg(instance, format, arg...)       \
  81         atm_printk(KERN_DEBUG, instance , format , ## arg)
  82 #define atm_rldbg(instance, format, arg...)     \
  83         if (printk_ratelimit())                         \
  84                 atm_printk(KERN_DEBUG, instance , format , ## arg)
  85 #else
  86 #define atm_dbg(instance, format, arg...)       \
  87         do {} while (0)
  88 #define atm_rldbg(instance, format, arg...)     \
  89         do {} while (0)
  90 #endif
  91
  92
  93 /* flags, set by mini-driver in bind() */
  94
  95 #define UDSL_SKIP_HEAVY_INIT    (1<<0)
  96 #define UDSL_USE_ISOC           (1<<1)
  97 #define UDSL_IGNORE_EILSEQ      (1<<2)
  98
  99
 100 /* mini driver */
 101
 102 struct usbatm_data;
 103
 104 /*
 105 *  Assuming all methods exist and succeed, they are called in this order:
 106 *
 107 *       bind, heavy_init, atm_start, ..., atm_stop, unbind
 108 */
 109
 110 struct usbatm_driver {
 111         const char *driver_name;
 112
 113         /* init device ... can sleep, or cause probe() failure */
 114         int (*bind) (struct usbatm_data *, struct usb_interface *,
 115                      const struct usb_device_id *id);
 116
 117         /* additional device initialization that is too slow to be done in probe() */
 118         int (*heavy_init) (struct usbatm_data *, struct usb_interface *);
 119
 120         /* cleanup device ... can sleep, but can't fail */
 121         void (*unbind) (struct usbatm_data *, struct usb_interface *);
 122
 123         /* init ATM device ... can sleep, or cause ATM initialization failure */
 124         int (*atm_start) (struct usbatm_data *, struct atm_dev *);
 125
 126         /* cleanup ATM device ... can sleep, but can't fail */
 127         void (*atm_stop) (struct usbatm_data *, struct atm_dev *);
 128
 129         int bulk_in;    /* bulk rx endpoint */
 130         int isoc_in;    /* isochronous rx endpoint */
 131         int bulk_out;   /* bulk tx endpoint */
 132
 133         unsigned rx_padding;
 134         unsigned tx_padding;
 135 };
 136
 137 extern int usbatm_usb_probe(struct usb_interface *intf, const struct usb_device_id *id,
 138                 struct usbatm_driver *driver);
 139 extern void usbatm_usb_disconnect(struct usb_interface *intf);
 140
 141
 142 struct usbatm_channel {
 143         int endpoint;                   /* usb pipe */
 144         unsigned int stride;            /* ATM cell size + padding */
 145         unsigned int buf_size;          /* urb buffer size */
 146         unsigned int packet_size;       /* endpoint maxpacket */
 147         spinlock_t lock;
 148         struct list_head list;
 149         struct tasklet_struct tasklet;
 150         struct timer_list delay;
 151         struct usbatm_data *usbatm;
 152 };
 153
 154 /* main driver data */
 155
 156 struct usbatm_data {
 157         /******************
 158         *  public fields  *
 159         ******************/
 160
 161         /* mini driver */
 162         struct usbatm_driver *driver;
 163         void *driver_data;
 164         char driver_name[16];
 165         unsigned int flags; /* set by mini-driver in bind() */
 166
 167         /* USB device */
 168         struct usb_device *usb_dev;
 169         struct usb_interface *usb_intf;
 170         char description[64];
 171
 172         /* ATM device */
 173         struct atm_dev *atm_dev;
 174
 175         /********************************
 176         *  private fields - do not use  *
 177         ********************************/
 178
 179         struct kref refcount;
 180         struct mutex serialize;
 181         int disconnected;
 182
 183         /* heavy init */
 184         struct task_struct *thread;
 185         struct completion thread_started;
 186         struct completion thread_exited;
 187
 188         /* ATM device */
 189         struct list_head vcc_list;
 190
 191         struct usbatm_channel rx_channel;
 192         struct usbatm_channel tx_channel;
 193
 194         struct sk_buff_head sndqueue;
 195         struct sk_buff *current_skb;    /* being emptied */
 196
 197         struct usbatm_vcc_data *cached_vcc;
 198         int cached_vci;
 199         short cached_vpi;
 200
 201         unsigned char *cell_buf;        /* holds partial rx cell */
 202         unsigned int buf_usage;
 203
 204         struct urb *urbs[0];
 205 };
 206
 207 static inline void *to_usbatm_driver_data(struct usb_interface *intf)
 208 {
 209         struct usbatm_data *usbatm_instance;
 210
 211         if (intf == NULL)
 212                 return NULL;
 213
 214         usbatm_instance = usb_get_intfdata(intf);
 215
 216         if (usbatm_instance == NULL) /* set NULL before unbind() */
 217                 return NULL;
 218
 219         return usbatm_instance->driver_data; /* set NULL after unbind() */
 220 }
 221
 222 #endif  /* _USBATM_H_ */