include/net/irda/irda_device.h

   1 /*********************************************************************
   2  *
   3  * Filename:      irda_device.h
   4  * Version:       0.9
   5  * Description:   Contains various declarations used by the drivers
   6  * Status:        Experimental.
   7  * Author:        Dag Brattli <dagb@cs.uit.no>
   8  * Created at:    Tue Apr 14 12:41:42 1998
   9  * Modified at:   Mon Mar 20 09:08:57 2000
  10  * Modified by:   Dag Brattli <dagb@cs.uit.no>
  11  *
  12  *     Copyright (c) 1999-2000 Dag Brattli, All Rights Reserved.
  13  *     Copyright (c) 1998 Thomas Davis, <ratbert@radiks.net>,
  14  *     Copyright (c) 2000-2002 Jean Tourrilhes <jt@hpl.hp.com>
  15  *
  16  *     This program is free software; you can redistribute it and/or
  17  *     modify it under the terms of the GNU General Public License as
  18  *     published by the Free Software Foundation; either version 2 of
  19  *     the License, or (at your option) any later version.
  20  *
  21  *     This program is distributed in the hope that it will be useful,
  22  *     but WITHOUT ANY WARRANTY; without even the implied warranty of
  23  *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  24  *     GNU General Public License for more details.
  25  *
  26  *     You should have received a copy of the GNU General Public License
  27  *     along with this program; if not, write to the Free Software
  28  *     Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  29  *     MA 02111-1307 USA
  30  *
  31  ********************************************************************/
  32
  33 /*
  34  * This header contains all the IrDA definitions a driver really
  35  * needs, and therefore the driver should not need to include
  36  * any other IrDA headers - Jean II
  37  */
  38
  39 #ifndef IRDA_DEVICE_H
  40 #define IRDA_DEVICE_H
  41
  42 #include <linux/tty.h>
  43 #include <linux/netdevice.h>
  44 #include <linux/spinlock.h>
  45 #include <linux/skbuff.h>               /* struct sk_buff */
  46 #include <linux/irda.h>
  47 #include <linux/types.h>
  48
  49 #include <net/pkt_sched.h>
  50 #include <net/irda/irda.h>
  51 #include <net/irda/qos.h>               /* struct qos_info */
  52 #include <net/irda/irqueue.h>           /* irda_queue_t */
  53
  54 /* A few forward declarations (to make compiler happy) */
  55 struct irlap_cb;
  56
  57 /* Some non-standard interface flags (should not conflict with any in if.h) */
  58 #define IFF_SIR         0x0001 /* Supports SIR speeds */
  59 #define IFF_MIR         0x0002 /* Supports MIR speeds */
  60 #define IFF_FIR         0x0004 /* Supports FIR speeds */
  61 #define IFF_VFIR        0x0008 /* Supports VFIR speeds */
  62 #define IFF_PIO         0x0010 /* Supports PIO transfer of data */
  63 #define IFF_DMA         0x0020 /* Supports DMA transfer of data */
  64 #define IFF_SHM         0x0040 /* Supports shared memory data transfers */
  65 #define IFF_DONGLE      0x0080 /* Interface has a dongle attached */
  66 #define IFF_AIR         0x0100 /* Supports Advanced IR (AIR) standards */
  67
  68 #define IO_XMIT 0x01
  69 #define IO_RECV 0x02
  70
  71 typedef enum {
  72         IRDA_IRLAP, /* IrDA mode, and deliver to IrLAP */
  73         IRDA_RAW,   /* IrDA mode */
  74         SHARP_ASK,
  75         TV_REMOTE,  /* Also known as Consumer Electronics IR */
  76 } INFRARED_MODE;
  77
  78 typedef enum {
  79         IRDA_TASK_INIT,        /* All tasks are initialized with this state */
  80         IRDA_TASK_DONE,        /* Signals that the task is finished */
  81         IRDA_TASK_WAIT,
  82         IRDA_TASK_WAIT1,
  83         IRDA_TASK_WAIT2,
  84         IRDA_TASK_WAIT3,
  85         IRDA_TASK_CHILD_INIT,  /* Initializing child task */
  86         IRDA_TASK_CHILD_WAIT,  /* Waiting for child task to finish */
  87         IRDA_TASK_CHILD_DONE   /* Child task is finished */
  88 } IRDA_TASK_STATE;
  89
  90 struct irda_task;
  91 typedef int (*IRDA_TASK_CALLBACK) (struct irda_task *task);
  92
  93 struct irda_task {
  94         irda_queue_t q;
  95         magic_t magic;
  96
  97         IRDA_TASK_STATE state;
  98         IRDA_TASK_CALLBACK function;
  99         IRDA_TASK_CALLBACK finished;
 100
 101         struct irda_task *parent;
 102         struct timer_list timer;
 103
 104         void *instance; /* Instance being called */
 105         void *param;    /* Parameter to be used by instance */
 106 };
 107
 108 /* Dongle info */
 109 struct dongle_reg;
 110 typedef struct {
 111         struct dongle_reg *issue;     /* Registration info */
 112         struct net_device *dev;           /* Device we are attached to */
 113         struct irda_task *speed_task; /* Task handling speed change */
 114         struct irda_task *reset_task; /* Task handling reset */
 115         __u32 speed;                  /* Current speed */
 116
 117         /* Callbacks to the IrDA device driver */
 118         int (*set_mode)(struct net_device *, int mode);
 119         int (*read)(struct net_device *dev, __u8 *buf, int len);
 120         int (*write)(struct net_device *dev, __u8 *buf, int len);
 121         int (*set_dtr_rts)(struct net_device *dev, int dtr, int rts);
 122 } dongle_t;
 123
 124 /* Dongle registration info */
 125 struct dongle_reg {
 126         irda_queue_t q;         /* Must be first */
 127         IRDA_DONGLE type;
 128
 129         void (*open)(dongle_t *dongle, struct qos_info *qos);
 130         void (*close)(dongle_t *dongle);
 131         int  (*reset)(struct irda_task *task);
 132         int  (*change_speed)(struct irda_task *task);
 133         struct module *owner;
 134 };
 135
 136 /*
 137  * Per-packet information we need to hide inside sk_buff
 138  * (must not exceed 48 bytes, check with struct sk_buff)
 139  */
 140 struct irda_skb_cb {
 141         magic_t magic;       /* Be sure that we can trust the information */
 142         __u32   next_speed;  /* The Speed to be set *after* this frame */
 143         __u16   mtt;         /* Minimum turn around time */
 144         __u16   xbofs;       /* Number of xbofs required, used by SIR mode */
 145         __u16   next_xbofs;  /* Number of xbofs required *after* this frame */
 146         void    *context;    /* May be used by drivers */
 147         void    (*destructor)(struct sk_buff *skb); /* Used for flow control */
 148         __u16   xbofs_delay; /* Number of xbofs used for generating the mtt */
 149         __u8    line;        /* Used by IrCOMM in IrLPT mode */
 150 };
 151
 152 /* Chip specific info */
 153 typedef struct {
 154         int cfg_base;         /* Config register IO base */
 155         int sir_base;         /* SIR IO base */
 156         int fir_base;         /* FIR IO base */
 157         int mem_base;         /* Shared memory base */
 158         int sir_ext;          /* Length of SIR iobase */
 159         int fir_ext;          /* Length of FIR iobase */
 160         int irq, irq2;        /* Interrupts used */
 161         int dma, dma2;        /* DMA channel(s) used */
 162         int fifo_size;        /* FIFO size */
 163         int irqflags;         /* interrupt flags (ie, IRQF_SHARED|IRQF_DISABLED) */
 164         int direction;        /* Link direction, used by some FIR drivers */
 165         int enabled;          /* Powered on? */
 166         int suspended;        /* Suspended by APM */
 167         __u32 speed;          /* Currently used speed */
 168         __u32 new_speed;      /* Speed we must change to when Tx is finished */
 169         int dongle_id;        /* Dongle or transceiver currently used */
 170 } chipio_t;
 171
 172 /* IO buffer specific info (inspired by struct sk_buff) */
 173 typedef struct {
 174         int state;            /* Receiving state (transmit state not used) */
 175         int in_frame;         /* True if receiving frame */
 176
 177         __u8 *head;           /* start of buffer */
 178         __u8 *data;           /* start of data in buffer */
 179
 180         int len;              /* current length of data */
 181         int truesize;         /* total allocated size of buffer */
 182         __u16 fcs;
 183
 184         struct sk_buff *skb;    /* ZeroCopy Rx in async_unwrap_char() */
 185 } iobuff_t;
 186
 187 /* Maximum SIR frame (skb) that we expect to receive *unwrapped*.
 188  * Max LAP MTU (I field) is 2048 bytes max (IrLAP 1.1, chapt 6.6.5, p40).
 189  * Max LAP header is 2 bytes (for now).
 190  * Max CRC is 2 bytes at SIR, 4 bytes at FIR.
 191  * Need 1 byte for skb_reserve() to align IP header for IrLAN.
 192  * Add a few extra bytes just to be safe (buffer is power of two anyway)
 193  * Jean II */
 194 #define IRDA_SKB_MAX_MTU        2064
 195 /* Maximum SIR frame that we expect to send, wrapped (i.e. with XBOFS
 196  * and escaped characters on top of above). */
 197 #define IRDA_SIR_MAX_FRAME      4269
 198
 199 /* The SIR unwrapper async_unwrap_char() will use a Rx-copy-break mechanism
 200  * when using the optional ZeroCopy Rx, where only small frames are memcpy
 201  * to a smaller skb to save memory. This is the threshold under which copy
 202  * will happen (and over which it won't happen).
 203  * Some FIR drivers may use this #define as well...
 204  * This is the same value as various Ethernet drivers. - Jean II */
 205 #define IRDA_RX_COPY_THRESHOLD  256
 206
 207 /* Function prototypes */
 208 int  irda_device_init(void);
 209 void irda_device_cleanup(void);
 210
 211 /* IrLAP entry points used by the drivers.
 212  * We declare them here to avoid the driver pulling a whole bunch stack
 213  * headers they don't really need - Jean II */
 214 struct irlap_cb *irlap_open(struct net_device *dev, struct qos_info *qos,
 215                             const char *hw_name);
 216 void irlap_close(struct irlap_cb *self);
 217
 218 /* Interface to be uses by IrLAP */
 219 void irda_device_set_media_busy(struct net_device *dev, int status);
 220 int  irda_device_is_media_busy(struct net_device *dev);
 221 int  irda_device_is_receiving(struct net_device *dev);
 222
 223 /* Interface for internal use */
 224 static inline int irda_device_txqueue_empty(const struct net_device *dev)
 225 {
 226         return skb_queue_empty(&dev->qdisc->q);
 227 }
 228 int  irda_device_set_raw_mode(struct net_device* self, int status);
 229 struct net_device *alloc_irdadev(int sizeof_priv);
 230
 231 void irda_setup_dma(int channel, dma_addr_t buffer, int count, int mode);
 232
 233 /*
 234  * Function irda_get_mtt (skb)
 235  *
 236  *    Utility function for getting the minimum turnaround time out of
 237  *    the skb, where it has been hidden in the cb field.
 238  */
 239 static inline __u16 irda_get_mtt(const struct sk_buff *skb)
 240 {
 241         const struct irda_skb_cb *cb = (const struct irda_skb_cb *) skb->cb;
 242         return (cb->magic == LAP_MAGIC) ? cb->mtt : 10000;
 243 }
 244
 245 /*
 246  * Function irda_get_next_speed (skb)
 247  *
 248  *    Extract the speed that should be set *after* this frame from the skb
 249  *
 250  * Note : return -1 for user space frames
 251  */
 252 static inline __u32 irda_get_next_speed(const struct sk_buff *skb)
 253 {
 254         const struct irda_skb_cb *cb = (const struct irda_skb_cb *) skb->cb;
 255         return (cb->magic == LAP_MAGIC) ? cb->next_speed : -1;
 256 }
 257
 258 /*
 259  * Function irda_get_next_xbofs (skb)
 260  *
 261  *    Extract the xbofs that should be set for this frame from the skb
 262  *
 263  * Note : default to 10 for user space frames
 264  */
 265 static inline __u16 irda_get_xbofs(const struct sk_buff *skb)
 266 {
 267         const struct irda_skb_cb *cb = (const struct irda_skb_cb *) skb->cb;
 268         return (cb->magic == LAP_MAGIC) ? cb->xbofs : 10;
 269 }
 270
 271 /*
 272  * Function irda_get_next_xbofs (skb)
 273  *
 274  *    Extract the xbofs that should be set *after* this frame from the skb
 275  *
 276  * Note : return -1 for user space frames
 277  */
 278 static inline __u16 irda_get_next_xbofs(const struct sk_buff *skb)
 279 {
 280         const struct irda_skb_cb *cb = (const struct irda_skb_cb *) skb->cb;
 281         return (cb->magic == LAP_MAGIC) ? cb->next_xbofs : -1;
 282 }
 283 #endif /* IRDA_DEVICE_H */
 284
 285