drivers/usb/atm/usb_atm.h

   1 /******************************************************************************
   2  *  usb_atm.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 #include <linux/config.h>
  25 #include <linux/list.h>
  26 #include <linux/kref.h>
  27 #include <linux/atm.h>
  28 #include <linux/atmdev.h>
  29 #include <asm/semaphore.h>
  30
  31 /*
  32 #define DEBUG
  33 #define VERBOSE_DEBUG
  34 */
  35
  36 #if !defined (DEBUG) && defined (CONFIG_USB_DEBUG)
  37 #       define DEBUG
  38 #endif
  39
  40 #include <linux/usb.h>
  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 '" #x "' at line %d", __LINE__); } while(0)
  46 #endif
  47
  48 #define UDSL_MAX_RCV_URBS               4
  49 #define UDSL_MAX_SND_URBS               4
  50 #define UDSL_MAX_RCV_BUFS               8
  51 #define UDSL_MAX_SND_BUFS               8
  52 #define UDSL_MAX_RCV_BUF_SIZE           1024    /* ATM cells */
  53 #define UDSL_MAX_SND_BUF_SIZE           1024    /* ATM cells */
  54 #define UDSL_DEFAULT_RCV_URBS           2
  55 #define UDSL_DEFAULT_SND_URBS           2
  56 #define UDSL_DEFAULT_RCV_BUFS           4
  57 #define UDSL_DEFAULT_SND_BUFS           4
  58 #define UDSL_DEFAULT_RCV_BUF_SIZE       64      /* ATM cells */
  59 #define UDSL_DEFAULT_SND_BUF_SIZE       64      /* ATM cells */
  60
  61 #define ATM_CELL_HEADER                 (ATM_CELL_SIZE - ATM_CELL_PAYLOAD)
  62 #define UDSL_NUM_CELLS(x)               (((x) + ATM_AAL5_TRAILER + ATM_CELL_PAYLOAD - 1) / ATM_CELL_PAYLOAD)
  63
  64 /* receive */
  65
  66 struct udsl_receive_buffer {
  67         struct list_head list;
  68         unsigned char *base;
  69         unsigned int filled_cells;
  70 };
  71
  72 struct udsl_receiver {
  73         struct list_head list;
  74         struct udsl_receive_buffer *buffer;
  75         struct urb *urb;
  76         struct udsl_instance_data *instance;
  77 };
  78
  79 struct udsl_vcc_data {
  80         /* vpi/vci lookup */
  81         struct list_head list;
  82         short vpi;
  83         int vci;
  84         struct atm_vcc *vcc;
  85
  86         /* raw cell reassembly */
  87         struct sk_buff *sarb;
  88 };
  89
  90 /* send */
  91
  92 struct udsl_send_buffer {
  93         struct list_head list;
  94         unsigned char *base;
  95         unsigned char *free_start;
  96         unsigned int free_cells;
  97 };
  98
  99 struct udsl_sender {
 100         struct list_head list;
 101         struct udsl_send_buffer *buffer;
 102         struct urb *urb;
 103         struct udsl_instance_data *instance;
 104 };
 105
 106 struct udsl_control {
 107         struct atm_skb_data atm_data;
 108         unsigned int num_cells;
 109         unsigned int num_entire;
 110         unsigned int pdu_padding;
 111         unsigned char aal5_trailer[ATM_AAL5_TRAILER];
 112 };
 113
 114 #define UDSL_SKB(x)             ((struct udsl_control *)(x)->cb)
 115
 116 /* main driver data */
 117
 118 enum udsl_status {
 119         UDSL_NO_FIRMWARE,
 120         UDSL_LOADING_FIRMWARE,
 121         UDSL_LOADED_FIRMWARE
 122 };
 123
 124 struct udsl_instance_data {
 125         struct kref refcount;
 126         struct semaphore serialize;
 127
 128         /* USB device part */
 129         struct usb_device *usb_dev;
 130         char description[64];
 131         int data_endpoint;
 132         int snd_padding;
 133         int rcv_padding;
 134         const char *driver_name;
 135
 136         /* ATM device part */
 137         struct atm_dev *atm_dev;
 138         struct list_head vcc_list;
 139
 140         /* firmware */
 141         int (*firmware_wait) (struct udsl_instance_data *);
 142         enum udsl_status status;
 143         wait_queue_head_t firmware_waiters;
 144
 145         /* receive */
 146         struct udsl_receiver receivers[UDSL_MAX_RCV_URBS];
 147         struct udsl_receive_buffer receive_buffers[UDSL_MAX_RCV_BUFS];
 148
 149         spinlock_t receive_lock;
 150         struct list_head spare_receivers;
 151         struct list_head filled_receive_buffers;
 152
 153         struct tasklet_struct receive_tasklet;
 154         struct list_head spare_receive_buffers;
 155
 156         /* send */
 157         struct udsl_sender senders[UDSL_MAX_SND_URBS];
 158         struct udsl_send_buffer send_buffers[UDSL_MAX_SND_BUFS];
 159
 160         struct sk_buff_head sndqueue;
 161
 162         spinlock_t send_lock;
 163         struct list_head spare_senders;
 164         struct list_head spare_send_buffers;
 165
 166         struct tasklet_struct send_tasklet;
 167         struct sk_buff *current_skb;                    /* being emptied */
 168         struct udsl_send_buffer *current_buffer;        /* being filled */
 169         struct list_head filled_send_buffers;
 170 };
 171
 172 extern int udsl_instance_setup(struct usb_device *dev,
 173                                struct udsl_instance_data *instance);
 174 extern void udsl_instance_disconnect(struct udsl_instance_data *instance);
 175 extern void udsl_get_instance(struct udsl_instance_data *instance);
 176 extern void udsl_put_instance(struct udsl_instance_data *instance);