include/linux/parport.h

   1 /*
   2  * Any part of this program may be used in documents licensed under
   3  * the GNU Free Documentation License, Version 1.1 or any later version
   4  * published by the Free Software Foundation.
   5  */
   6 #ifndef _PARPORT_H_
   7 #define _PARPORT_H_
   8
   9
  10 #include <linux/jiffies.h>
  11 #include <linux/proc_fs.h>
  12 #include <linux/spinlock.h>
  13 #include <linux/wait.h>
  14 #include <linux/irqreturn.h>
  15 #include <linux/semaphore.h>
  16 #include <linux/device.h>
  17 #include <asm/ptrace.h>
  18 #include <uapi/linux/parport.h>
  19
  20 /* Define this later. */
  21 struct parport;
  22 struct pardevice;
  23
  24 struct pc_parport_state {
  25         unsigned int ctr;
  26         unsigned int ecr;
  27 };
  28
  29 struct ax_parport_state {
  30         unsigned int ctr;
  31         unsigned int ecr;
  32         unsigned int dcsr;
  33 };
  34
  35 /* used by both parport_amiga and parport_mfc3 */
  36 struct amiga_parport_state {
  37        unsigned char data;     /* ciaa.prb */
  38        unsigned char datadir;  /* ciaa.ddrb */
  39        unsigned char status;   /* ciab.pra & 7 */
  40        unsigned char statusdir;/* ciab.ddrb & 7 */
  41 };
  42
  43 struct ip32_parport_state {
  44         unsigned int dcr;
  45         unsigned int ecr;
  46 };
  47
  48 struct parport_state {
  49         union {
  50                 struct pc_parport_state pc;
  51                 /* ARC has no state. */
  52                 struct ax_parport_state ax;
  53                 struct amiga_parport_state amiga;
  54                 /* Atari has not state. */
  55                 struct ip32_parport_state ip32;
  56                 void *misc;
  57         } u;
  58 };
  59
  60 struct parport_operations {
  61         /* IBM PC-style virtual registers. */
  62         void (*write_data)(struct parport *, unsigned char);
  63         unsigned char (*read_data)(struct parport *);
  64
  65         void (*write_control)(struct parport *, unsigned char);
  66         unsigned char (*read_control)(struct parport *);
  67         unsigned char (*frob_control)(struct parport *, unsigned char mask,
  68                                       unsigned char val);
  69
  70         unsigned char (*read_status)(struct parport *);
  71
  72         /* IRQs. */
  73         void (*enable_irq)(struct parport *);
  74         void (*disable_irq)(struct parport *);
  75
  76         /* Data direction. */
  77         void (*data_forward) (struct parport *);
  78         void (*data_reverse) (struct parport *);
  79
  80         /* For core parport code. */
  81         void (*init_state)(struct pardevice *, struct parport_state *);
  82         void (*save_state)(struct parport *, struct parport_state *);
  83         void (*restore_state)(struct parport *, struct parport_state *);
  84
  85         /* Block read/write */
  86         size_t (*epp_write_data) (struct parport *port, const void *buf,
  87                                   size_t len, int flags);
  88         size_t (*epp_read_data) (struct parport *port, void *buf, size_t len,
  89                                  int flags);
  90         size_t (*epp_write_addr) (struct parport *port, const void *buf,
  91                                   size_t len, int flags);
  92         size_t (*epp_read_addr) (struct parport *port, void *buf, size_t len,
  93                                  int flags);
  94
  95         size_t (*ecp_write_data) (struct parport *port, const void *buf,
  96                                   size_t len, int flags);
  97         size_t (*ecp_read_data) (struct parport *port, void *buf, size_t len,
  98                                  int flags);
  99         size_t (*ecp_write_addr) (struct parport *port, const void *buf,
 100                                   size_t len, int flags);
 101
 102         size_t (*compat_write_data) (struct parport *port, const void *buf,
 103                                      size_t len, int flags);
 104         size_t (*nibble_read_data) (struct parport *port, void *buf,
 105                                     size_t len, int flags);
 106         size_t (*byte_read_data) (struct parport *port, void *buf,
 107                                   size_t len, int flags);
 108         struct module *owner;
 109 };
 110
 111 struct parport_device_info {
 112         parport_device_class class;
 113         const char *class_name;
 114         const char *mfr;
 115         const char *model;
 116         const char *cmdset;
 117         const char *description;
 118 };
 119
 120 /* Each device can have two callback functions:
 121  *  1) a preemption function, called by the resource manager to request
 122  *     that the driver relinquish control of the port.  The driver should
 123  *     return zero if it agrees to release the port, and nonzero if it
 124  *     refuses.  Do not call parport_release() - the kernel will do this
 125  *     implicitly.
 126  *
 127  *  2) a wake-up function, called by the resource manager to tell drivers
 128  *     that the port is available to be claimed.  If a driver wants to use
 129  *     the port, it should call parport_claim() here.
 130  */
 131
 132 /* A parallel port device */
 133 struct pardevice {
 134         const char *name;
 135         struct parport *port;
 136         int daisy;
 137         int (*preempt)(void *);
 138         void (*wakeup)(void *);
 139         void *private;
 140         void (*irq_func)(void *);
 141         unsigned int flags;
 142         struct pardevice *next;
 143         struct pardevice *prev;
 144         struct device dev;
 145         bool devmodel;
 146         struct parport_state *state;     /* saved status over preemption */
 147         wait_queue_head_t wait_q;
 148         unsigned long int time;
 149         unsigned long int timeslice;
 150         volatile long int timeout;
 151         unsigned long waiting;           /* long req'd for set_bit --RR */
 152         struct pardevice *waitprev;
 153         struct pardevice *waitnext;
 154         void * sysctl_table;
 155 };
 156
 157 #define to_pardevice(n) container_of(n, struct pardevice, dev)
 158
 159 /* IEEE1284 information */
 160
 161 /* IEEE1284 phases. These are exposed to userland through ppdev IOCTL
 162  * PP[GS]ETPHASE, so do not change existing values. */
 163 enum ieee1284_phase {
 164         IEEE1284_PH_FWD_DATA,
 165         IEEE1284_PH_FWD_IDLE,
 166         IEEE1284_PH_TERMINATE,
 167         IEEE1284_PH_NEGOTIATION,
 168         IEEE1284_PH_HBUSY_DNA,
 169         IEEE1284_PH_REV_IDLE,
 170         IEEE1284_PH_HBUSY_DAVAIL,
 171         IEEE1284_PH_REV_DATA,
 172         IEEE1284_PH_ECP_SETUP,
 173         IEEE1284_PH_ECP_FWD_TO_REV,
 174         IEEE1284_PH_ECP_REV_TO_FWD,
 175         IEEE1284_PH_ECP_DIR_UNKNOWN,
 176 };
 177 struct ieee1284_info {
 178         int mode;
 179         volatile enum ieee1284_phase phase;
 180         struct semaphore irq;
 181 };
 182
 183 /* A parallel port */
 184 struct parport {
 185         unsigned long base;     /* base address */
 186         unsigned long base_hi;  /* base address (hi - ECR) */
 187         unsigned int size;      /* IO extent */
 188         const char *name;
 189         unsigned int modes;
 190         int irq;                /* interrupt (or -1 for none) */
 191         int dma;
 192         int muxport;            /* which muxport (if any) this is */
 193         int portnum;            /* which physical parallel port (not mux) */
 194         struct device *dev;     /* Physical device associated with IO/DMA.
 195                                  * This may unfortulately be null if the
 196                                  * port has a legacy driver.
 197                                  */
 198         struct device bus_dev;  /* to link with the bus */
 199         struct parport *physport;
 200                                 /* If this is a non-default mux
 201                                    parport, i.e. we're a clone of a real
 202                                    physical port, this is a pointer to that
 203                                    port. The locking is only done in the
 204                                    real port.  For a clone port, the
 205                                    following structure members are
 206                                    meaningless: devices, cad, muxsel,
 207                                    waithead, waittail, flags, pdir,
 208                                    dev, ieee1284, *_lock.
 209
 210                                    It this is a default mux parport, or
 211                                    there is no mux involved, this points to
 212                                    ourself. */
 213
 214         struct pardevice *devices;
 215         struct pardevice *cad;  /* port owner */
 216         int daisy;              /* currently selected daisy addr */
 217         int muxsel;             /* currently selected mux port */
 218
 219         struct pardevice *waithead;
 220         struct pardevice *waittail;
 221
 222         struct list_head list;
 223         struct timer_list timer;
 224         unsigned int flags;
 225
 226         void *sysctl_table;
 227         struct parport_device_info probe_info[5]; /* 0-3 + non-IEEE1284.3 */
 228         struct ieee1284_info ieee1284;
 229
 230         struct parport_operations *ops;
 231         void *private_data;     /* for lowlevel driver */
 232
 233         int number;             /* port index - the `n' in `parportn' */
 234         spinlock_t pardevice_lock;
 235         spinlock_t waitlist_lock;
 236         rwlock_t cad_lock;
 237
 238         int spintime;
 239         atomic_t ref_count;
 240
 241         unsigned long devflags;
 242 #define PARPORT_DEVPROC_REGISTERED      0
 243         struct pardevice *proc_device;  /* Currently register proc device */
 244
 245         struct list_head full_list;
 246         struct parport *slaves[3];
 247 };
 248
 249 #define to_parport_dev(n) container_of(n, struct parport, bus_dev)
 250
 251 #define DEFAULT_SPIN_TIME 500 /* us */
 252
 253 struct parport_driver {
 254         const char *name;
 255         void (*detach) (struct parport *);
 256         void (*match_port)(struct parport *);
 257         int (*probe)(struct pardevice *);
 258         struct device_driver driver;
 259 };
 260
 261 #define to_parport_driver(n) container_of(n, struct parport_driver, driver)
 262
 263 int parport_bus_init(void);
 264 void parport_bus_exit(void);
 265
 266 /* parport_register_port registers a new parallel port at the given
 267    address (if one does not already exist) and returns a pointer to it.
 268    This entails claiming the I/O region, IRQ and DMA.  NULL is returned
 269    if initialisation fails. */
 270 struct parport *parport_register_port(unsigned long base, int irq, int dma,
 271                                       struct parport_operations *ops);
 272
 273 /* Once a registered port is ready for high-level drivers to use, the
 274    low-level driver that registered it should announce it.  This will
 275    call the high-level drivers' attach() functions (after things like
 276    determining the IEEE 1284.3 topology of the port and collecting
 277    DeviceIDs). */
 278 void parport_announce_port (struct parport *port);
 279
 280 /* Unregister a port. */
 281 extern void parport_remove_port(struct parport *port);
 282
 283 /* Register a new high-level driver. */
 284
 285 int __must_check __parport_register_driver(struct parport_driver *,
 286                                            struct module *,
 287                                            const char *mod_name);
 288 /*
 289  * parport_register_driver must be a macro so that KBUILD_MODNAME can
 290  * be expanded
 291  */
 292
 293 /**
 294  *      parport_register_driver - register a parallel port device driver
 295  *      @driver: structure describing the driver
 296  *
 297  *      This can be called by a parallel port device driver in order
 298  *      to receive notifications about ports being found in the
 299  *      system, as well as ports no longer available.
 300  *
 301  *      The @driver structure is allocated by the caller and must not be
 302  *      deallocated until after calling parport_unregister_driver().
 303  *
 304  *      If using the non device model:
 305  *      The driver's attach() function may block.  The port that
 306  *      attach() is given will be valid for the duration of the
 307  *      callback, but if the driver wants to take a copy of the
 308  *      pointer it must call parport_get_port() to do so.  Calling
 309  *      parport_register_device() on that port will do this for you.
 310  *
 311  *      The driver's detach() function may block.  The port that
 312  *      detach() is given will be valid for the duration of the
 313  *      callback, but if the driver wants to take a copy of the
 314  *      pointer it must call parport_get_port() to do so.
 315  *
 316  *
 317  *      Returns 0 on success. The non device model will always succeeds.
 318  *      but the new device model can fail and will return the error code.
 319  **/
 320 #define parport_register_driver(driver)             \
 321         __parport_register_driver(driver, THIS_MODULE, KBUILD_MODNAME)
 322
 323 /* Unregister a high-level driver. */
 324 void parport_unregister_driver(struct parport_driver *);
 325
 326 /**
 327  * module_parport_driver() - Helper macro for registering a modular parport driver
 328  * @__parport_driver: struct parport_driver to be used
 329  *
 330  * Helper macro for parport drivers which do not do anything special in module
 331  * init and exit. This eliminates a lot of boilerplate. Each module may only
 332  * use this macro once, and calling it replaces module_init() and module_exit().
 333  */
 334 #define module_parport_driver(__parport_driver) \
 335         module_driver(__parport_driver, parport_register_driver, parport_unregister_driver)
 336
 337 /* If parport_register_driver doesn't fit your needs, perhaps
 338  * parport_find_xxx does. */
 339 extern struct parport *parport_find_number (int);
 340 extern struct parport *parport_find_base (unsigned long);
 341
 342 /* generic irq handler, if it suits your needs */
 343 extern irqreturn_t parport_irq_handler(int irq, void *dev_id);
 344
 345 /* Reference counting for ports. */
 346 extern struct parport *parport_get_port (struct parport *);
 347 extern void parport_put_port (struct parport *);
 348 void parport_del_port(struct parport *);
 349
 350 struct pardev_cb {
 351         int (*preempt)(void *);
 352         void (*wakeup)(void *);
 353         void *private;
 354         void (*irq_func)(void *);
 355         unsigned int flags;
 356 };
 357
 358 /*
 359  * parport_register_dev_model declares that a device is connected to a
 360  * port, and tells the kernel all it needs to know.
 361  */
 362 struct pardevice *
 363 parport_register_dev_model(struct parport *port, const char *name,
 364                            const struct pardev_cb *par_dev_cb, int cnt);
 365
 366 /* parport_unregister unlinks a device from the chain. */
 367 extern void parport_unregister_device(struct pardevice *dev);
 368
 369 /* parport_claim tries to gain ownership of the port for a particular
 370    driver.  This may fail (return non-zero) if another driver is busy.
 371    If this driver has registered an interrupt handler, it will be
 372    enabled.  */
 373 extern int parport_claim(struct pardevice *dev);
 374
 375 /* parport_claim_or_block is the same, but sleeps if the port cannot
 376    be claimed.  Return value is 1 if it slept, 0 normally and -errno
 377    on error.  */
 378 extern int parport_claim_or_block(struct pardevice *dev);
 379
 380 /* parport_release reverses a previous parport_claim.  This can never
 381    fail, though the effects are undefined (except that they are bad)
 382    if you didn't previously own the port.  Once you have released the
 383    port you should make sure that neither your code nor the hardware
 384    on the port tries to initiate any communication without first
 385    re-claiming the port.  If you mess with the port state (enabling
 386    ECP for example) you should clean up before releasing the port. */
 387
 388 extern void parport_release(struct pardevice *dev);
 389
 390 /**
 391  * parport_yield - relinquish a parallel port temporarily
 392  * @dev: a device on the parallel port
 393  *
 394  * This function relinquishes the port if it would be helpful to other
 395  * drivers to do so.  Afterwards it tries to reclaim the port using
 396  * parport_claim(), and the return value is the same as for
 397  * parport_claim().  If it fails, the port is left unclaimed and it is
 398  * the driver's responsibility to reclaim the port.
 399  *
 400  * The parport_yield() and parport_yield_blocking() functions are for
 401  * marking points in the driver at which other drivers may claim the
 402  * port and use their devices.  Yielding the port is similar to
 403  * releasing it and reclaiming it, but is more efficient because no
 404  * action is taken if there are no other devices needing the port.  In
 405  * fact, nothing is done even if there are other devices waiting but
 406  * the current device is still within its "timeslice".  The default
 407  * timeslice is half a second, but it can be adjusted via the /proc
 408  * interface.
 409  **/
 410 static __inline__ int parport_yield(struct pardevice *dev)
 411 {
 412         unsigned long int timeslip = (jiffies - dev->time);
 413         if ((dev->port->waithead == NULL) || (timeslip < dev->timeslice))
 414                 return 0;
 415         parport_release(dev);
 416         return parport_claim(dev);
 417 }
 418
 419 /**
 420  * parport_yield_blocking - relinquish a parallel port temporarily
 421  * @dev: a device on the parallel port
 422  *
 423  * This function relinquishes the port if it would be helpful to other
 424  * drivers to do so.  Afterwards it tries to reclaim the port using
 425  * parport_claim_or_block(), and the return value is the same as for
 426  * parport_claim_or_block().
 427  **/
 428 static __inline__ int parport_yield_blocking(struct pardevice *dev)
 429 {
 430         unsigned long int timeslip = (jiffies - dev->time);
 431         if ((dev->port->waithead == NULL) || (timeslip < dev->timeslice))
 432                 return 0;
 433         parport_release(dev);
 434         return parport_claim_or_block(dev);
 435 }
 436
 437 /* Flags used to identify what a device does. */
 438 #define PARPORT_DEV_TRAN                0       /* WARNING !! DEPRECATED !! */
 439 #define PARPORT_DEV_LURK                (1<<0)  /* WARNING !! DEPRECATED !! */
 440 #define PARPORT_DEV_EXCL                (1<<1)  /* Need exclusive access. */
 441
 442 #define PARPORT_FLAG_EXCL               (1<<1)  /* EXCL driver registered. */
 443
 444 /* IEEE1284 functions */
 445 extern void parport_ieee1284_interrupt (void *);
 446 extern int parport_negotiate (struct parport *, int mode);
 447 extern ssize_t parport_write (struct parport *, const void *buf, size_t len);
 448 extern ssize_t parport_read (struct parport *, void *buf, size_t len);
 449
 450 #define PARPORT_INACTIVITY_O_NONBLOCK 1
 451 extern long parport_set_timeout (struct pardevice *, long inactivity);
 452
 453 extern int parport_wait_event (struct parport *, long timeout);
 454 extern int parport_wait_peripheral (struct parport *port,
 455                                     unsigned char mask,
 456                                     unsigned char val);
 457 extern int parport_poll_peripheral (struct parport *port,
 458                                     unsigned char mask,
 459                                     unsigned char val,
 460                                     int usec);
 461
 462 /* For architectural drivers */
 463 extern size_t parport_ieee1284_write_compat (struct parport *,
 464                                              const void *, size_t, int);
 465 extern size_t parport_ieee1284_read_nibble (struct parport *,
 466                                             void *, size_t, int);
 467 extern size_t parport_ieee1284_read_byte (struct parport *,
 468                                           void *, size_t, int);
 469 extern size_t parport_ieee1284_ecp_read_data (struct parport *,
 470                                               void *, size_t, int);
 471 extern size_t parport_ieee1284_ecp_write_data (struct parport *,
 472                                                const void *, size_t, int);
 473 extern size_t parport_ieee1284_ecp_write_addr (struct parport *,
 474                                                const void *, size_t, int);
 475 extern size_t parport_ieee1284_epp_write_data (struct parport *,
 476                                                const void *, size_t, int);
 477 extern size_t parport_ieee1284_epp_read_data (struct parport *,
 478                                               void *, size_t, int);
 479 extern size_t parport_ieee1284_epp_write_addr (struct parport *,
 480                                                const void *, size_t, int);
 481 extern size_t parport_ieee1284_epp_read_addr (struct parport *,
 482                                               void *, size_t, int);
 483
 484 /* IEEE1284.3 functions */
 485 #define daisy_dev_name "Device ID probe"
 486 extern int parport_daisy_init (struct parport *port);
 487 extern void parport_daisy_fini (struct parport *port);
 488 extern struct pardevice *parport_open (int devnum, const char *name);
 489 extern void parport_close (struct pardevice *dev);
 490 extern ssize_t parport_device_id (int devnum, char *buffer, size_t len);
 491 extern void parport_daisy_deselect_all (struct parport *port);
 492 extern int parport_daisy_select (struct parport *port, int daisy, int mode);
 493
 494 /* Lowlevel drivers _can_ call this support function to handle irqs.  */
 495 static inline void parport_generic_irq(struct parport *port)
 496 {
 497         parport_ieee1284_interrupt (port);
 498         read_lock(&port->cad_lock);
 499         if (port->cad && port->cad->irq_func)
 500                 port->cad->irq_func(port->cad->private);
 501         read_unlock(&port->cad_lock);
 502 }
 503
 504 /* Prototypes from parport_procfs */
 505 extern int parport_proc_register(struct parport *pp);
 506 extern int parport_proc_unregister(struct parport *pp);
 507 extern int parport_device_proc_register(struct pardevice *device);
 508 extern int parport_device_proc_unregister(struct pardevice *device);
 509
 510 /* If PC hardware is the only type supported, we can optimise a bit.  */
 511 #if !defined(CONFIG_PARPORT_NOT_PC) && defined(CONFIG_PARPORT_PC)
 512
 513 #include <linux/parport_pc.h>
 514 #define parport_write_data(p,x)            parport_pc_write_data(p,x)
 515 #define parport_read_data(p)               parport_pc_read_data(p)
 516 #define parport_write_control(p,x)         parport_pc_write_control(p,x)
 517 #define parport_read_control(p)            parport_pc_read_control(p)
 518 #define parport_frob_control(p,m,v)        parport_pc_frob_control(p,m,v)
 519 #define parport_read_status(p)             parport_pc_read_status(p)
 520 #define parport_enable_irq(p)              parport_pc_enable_irq(p)
 521 #define parport_disable_irq(p)             parport_pc_disable_irq(p)
 522 #define parport_data_forward(p)            parport_pc_data_forward(p)
 523 #define parport_data_reverse(p)            parport_pc_data_reverse(p)
 524
 525 #else  /*  !CONFIG_PARPORT_NOT_PC  */
 526
 527 /* Generic operations vector through the dispatch table. */
 528 #define parport_write_data(p,x)            (p)->ops->write_data(p,x)
 529 #define parport_read_data(p)               (p)->ops->read_data(p)
 530 #define parport_write_control(p,x)         (p)->ops->write_control(p,x)
 531 #define parport_read_control(p)            (p)->ops->read_control(p)
 532 #define parport_frob_control(p,m,v)        (p)->ops->frob_control(p,m,v)
 533 #define parport_read_status(p)             (p)->ops->read_status(p)
 534 #define parport_enable_irq(p)              (p)->ops->enable_irq(p)
 535 #define parport_disable_irq(p)             (p)->ops->disable_irq(p)
 536 #define parport_data_forward(p)            (p)->ops->data_forward(p)
 537 #define parport_data_reverse(p)            (p)->ops->data_reverse(p)
 538
 539 #endif /*  !CONFIG_PARPORT_NOT_PC  */
 540
 541 extern unsigned long parport_default_timeslice;
 542 extern int parport_default_spintime;
 543
 544 #endif /* _PARPORT_H_ */