drivers/usb/atm/usbatm.h

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /******************************************************************************
   3  *  usbatm.h - Generic USB xDSL driver core
   4  *
   5  *  Copyright (C) 2001, Alcatel
   6  *  Copyright (C) 2003, Duncan Sands, SolNegro, Josep Comas
   7  *  Copyright (C) 2004, David Woodhouse
   8  ******************************************************************************/
   9
  10 #ifndef _USBATM_H_
  11 #define _USBATM_H_
  12
  13 #include <linux/atm.h>
  14 #include <linux/atmdev.h>
  15 #include <linux/completion.h>
  16 #include <linux/device.h>
  17 #include <linux/kernel.h>
  18 #include <linux/kref.h>
  19 #include <linux/list.h>
  20 #include <linux/stringify.h>
  21 #include <linux/usb.h>
  22 #include <linux/mutex.h>
  23 #include <linux/ratelimit.h>
  24
  25 /*
  26 #define VERBOSE_DEBUG
  27 */
  28
  29 #define usb_err(instance, format, arg...)       \
  30         dev_err(&(instance)->usb_intf->dev , format , ## arg)
  31 #define usb_info(instance, format, arg...)      \
  32         dev_info(&(instance)->usb_intf->dev , format , ## arg)
  33 #define usb_warn(instance, format, arg...)      \
  34         dev_warn(&(instance)->usb_intf->dev , format , ## arg)
  35 #define usb_dbg(instance, format, arg...)       \
  36         dev_dbg(&(instance)->usb_intf->dev , format , ## arg)
  37
  38 /* FIXME: move to dev_* once ATM is driver model aware */
  39 #define atm_printk(level, instance, format, arg...)     \
  40         printk(level "ATM dev %d: " format ,            \
  41         (instance)->atm_dev->number , ## arg)
  42
  43 #define atm_err(instance, format, arg...)       \
  44         atm_printk(KERN_ERR, instance , format , ## arg)
  45 #define atm_info(instance, format, arg...)      \
  46         atm_printk(KERN_INFO, instance , format , ## arg)
  47 #define atm_warn(instance, format, arg...)      \
  48         atm_printk(KERN_WARNING, instance , format , ## arg)
  49 #define atm_dbg(instance, format, ...)                                  \
  50         pr_debug("ATM dev %d: " format,                                 \
  51                  (instance)->atm_dev->number, ##__VA_ARGS__)
  52 #define atm_rldbg(instance, format, ...)                                \
  53         pr_debug_ratelimited("ATM dev %d: " format,                     \
  54                              (instance)->atm_dev->number, ##__VA_ARGS__)
  55
  56 /* flags, set by mini-driver in bind() */
  57
  58 #define UDSL_SKIP_HEAVY_INIT    (1<<0)
  59 #define UDSL_USE_ISOC           (1<<1)
  60 #define UDSL_IGNORE_EILSEQ      (1<<2)
  61
  62
  63 /* mini driver */
  64
  65 struct usbatm_data;
  66
  67 /*
  68 *  Assuming all methods exist and succeed, they are called in this order:
  69 *
  70 *       bind, heavy_init, atm_start, ..., atm_stop, unbind
  71 */
  72
  73 struct usbatm_driver {
  74         const char *driver_name;
  75
  76         /* init device ... can sleep, or cause probe() failure */
  77         int (*bind) (struct usbatm_data *, struct usb_interface *,
  78                      const struct usb_device_id *id);
  79
  80         /* additional device initialization that is too slow to be done in probe() */
  81         int (*heavy_init) (struct usbatm_data *, struct usb_interface *);
  82
  83         /* cleanup device ... can sleep, but can't fail */
  84         void (*unbind) (struct usbatm_data *, struct usb_interface *);
  85
  86         /* init ATM device ... can sleep, or cause ATM initialization failure */
  87         int (*atm_start) (struct usbatm_data *, struct atm_dev *);
  88
  89         /* cleanup ATM device ... can sleep, but can't fail */
  90         void (*atm_stop) (struct usbatm_data *, struct atm_dev *);
  91
  92         int bulk_in;    /* bulk rx endpoint */
  93         int isoc_in;    /* isochronous rx endpoint */
  94         int bulk_out;   /* bulk tx endpoint */
  95
  96         unsigned rx_padding;
  97         unsigned tx_padding;
  98 };
  99
 100 extern int usbatm_usb_probe(struct usb_interface *intf, const struct usb_device_id *id,
 101                 struct usbatm_driver *driver);
 102 extern void usbatm_usb_disconnect(struct usb_interface *intf);
 103
 104
 105 struct usbatm_channel {
 106         int endpoint;                   /* usb pipe */
 107         unsigned int stride;            /* ATM cell size + padding */
 108         unsigned int buf_size;          /* urb buffer size */
 109         unsigned int packet_size;       /* endpoint maxpacket */
 110         spinlock_t lock;
 111         struct list_head list;
 112         struct tasklet_struct tasklet;
 113         struct timer_list delay;
 114         struct usbatm_data *usbatm;
 115 };
 116
 117 /* main driver data */
 118
 119 struct usbatm_data {
 120         /******************
 121         *  public fields  *
 122         ******************/
 123
 124         /* mini driver */
 125         struct usbatm_driver *driver;
 126         void *driver_data;
 127         char driver_name[16];
 128         unsigned int flags; /* set by mini-driver in bind() */
 129
 130         /* USB device */
 131         struct usb_device *usb_dev;
 132         struct usb_interface *usb_intf;
 133         char description[64];
 134
 135         /* ATM device */
 136         struct atm_dev *atm_dev;
 137
 138         /********************************
 139         *  private fields - do not use  *
 140         ********************************/
 141
 142         struct kref refcount;
 143         struct mutex serialize;
 144         int disconnected;
 145
 146         /* heavy init */
 147         struct task_struct *thread;
 148         struct completion thread_started;
 149         struct completion thread_exited;
 150
 151         /* ATM device */
 152         struct list_head vcc_list;
 153
 154         struct usbatm_channel rx_channel;
 155         struct usbatm_channel tx_channel;
 156
 157         struct sk_buff_head sndqueue;
 158         struct sk_buff *current_skb;    /* being emptied */
 159
 160         struct usbatm_vcc_data *cached_vcc;
 161         int cached_vci;
 162         short cached_vpi;
 163
 164         unsigned char *cell_buf;        /* holds partial rx cell */
 165         unsigned int buf_usage;
 166
 167         struct urb *urbs[0];
 168 };
 169
 170 static inline void *to_usbatm_driver_data(struct usb_interface *intf)
 171 {
 172         struct usbatm_data *usbatm_instance;
 173
 174         if (intf == NULL)
 175                 return NULL;
 176
 177         usbatm_instance = usb_get_intfdata(intf);
 178
 179         if (usbatm_instance == NULL) /* set NULL before unbind() */
 180                 return NULL;
 181
 182         return usbatm_instance->driver_data; /* set NULL after unbind() */
 183 }
 184
 185 #endif  /* _USBATM_H_ */