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 ax88796_parport_state { 44 unsigned char cpr; 45 }; 46 47 struct ip32_parport_state { 48 unsigned int dcr; 49 unsigned int ecr; 50 }; 51 52 struct parport_state { 53 union { 54 struct pc_parport_state pc; 55 /* ARC has no state. */ 56 struct ax_parport_state ax; 57 struct amiga_parport_state amiga; 58 struct ax88796_parport_state ax88796; 59 /* Atari has not state. */ 60 struct ip32_parport_state ip32; 61 void *misc; 62 } u; 63 }; 64 65 struct parport_operations { 66 /* IBM PC-style virtual registers. */ 67 void (*write_data)(struct parport *, unsigned char); 68 unsigned char (*read_data)(struct parport *); 69 70 void (*write_control)(struct parport *, unsigned char); 71 unsigned char (*read_control)(struct parport *); 72 unsigned char (*frob_control)(struct parport *, unsigned char mask, 73 unsigned char val); 74 75 unsigned char (*read_status)(struct parport *); 76 77 /* IRQs. */ 78 void (*enable_irq)(struct parport *); 79 void (*disable_irq)(struct parport *); 80 81 /* Data direction. */ 82 void (*data_forward) (struct parport *); 83 void (*data_reverse) (struct parport *); 84 85 /* For core parport code. */ 86 void (*init_state)(struct pardevice *, struct parport_state *); 87 void (*save_state)(struct parport *, struct parport_state *); 88 void (*restore_state)(struct parport *, struct parport_state *); 89 90 /* Block read/write */ 91 size_t (*epp_write_data) (struct parport *port, const void *buf, 92 size_t len, int flags); 93 size_t (*epp_read_data) (struct parport *port, void *buf, size_t len, 94 int flags); 95 size_t (*epp_write_addr) (struct parport *port, const void *buf, 96 size_t len, int flags); 97 size_t (*epp_read_addr) (struct parport *port, void *buf, size_t len, 98 int flags); 99 100 size_t (*ecp_write_data) (struct parport *port, const void *buf, 101 size_t len, int flags); 102 size_t (*ecp_read_data) (struct parport *port, void *buf, size_t len, 103 int flags); 104 size_t (*ecp_write_addr) (struct parport *port, const void *buf, 105 size_t len, int flags); 106 107 size_t (*compat_write_data) (struct parport *port, const void *buf, 108 size_t len, int flags); 109 size_t (*nibble_read_data) (struct parport *port, void *buf, 110 size_t len, int flags); 111 size_t (*byte_read_data) (struct parport *port, void *buf, 112 size_t len, int flags); 113 struct module *owner; 114 }; 115 116 struct parport_device_info { 117 parport_device_class class; 118 const char *class_name; 119 const char *mfr; 120 const char *model; 121 const char *cmdset; 122 const char *description; 123 }; 124 125 /* Each device can have two callback functions: 126 * 1) a preemption function, called by the resource manager to request 127 * that the driver relinquish control of the port. The driver should 128 * return zero if it agrees to release the port, and nonzero if it 129 * refuses. Do not call parport_release() - the kernel will do this 130 * implicitly. 131 * 132 * 2) a wake-up function, called by the resource manager to tell drivers 133 * that the port is available to be claimed. If a driver wants to use 134 * the port, it should call parport_claim() here. 135 */ 136 137 /* A parallel port device */ 138 struct pardevice { 139 const char *name; 140 struct parport *port; 141 int daisy; 142 int (*preempt)(void *); 143 void (*wakeup)(void *); 144 void *private; 145 void (*irq_func)(void *); 146 unsigned int flags; 147 struct pardevice *next; 148 struct pardevice *prev; 149 struct device dev; 150 bool devmodel; 151 struct parport_state *state; /* saved status over preemption */ 152 wait_queue_head_t wait_q; 153 unsigned long int time; 154 unsigned long int timeslice; 155 volatile long int timeout; 156 unsigned long waiting; /* long req'd for set_bit --RR */ 157 struct pardevice *waitprev; 158 struct pardevice *waitnext; 159 void * sysctl_table; 160 }; 161 162 #define to_pardevice(n) container_of(n, struct pardevice, dev) 163 164 /* IEEE1284 information */ 165 166 /* IEEE1284 phases. These are exposed to userland through ppdev IOCTL 167 * PP[GS]ETPHASE, so do not change existing values. */ 168 enum ieee1284_phase { 169 IEEE1284_PH_FWD_DATA, 170 IEEE1284_PH_FWD_IDLE, 171 IEEE1284_PH_TERMINATE, 172 IEEE1284_PH_NEGOTIATION, 173 IEEE1284_PH_HBUSY_DNA, 174 IEEE1284_PH_REV_IDLE, 175 IEEE1284_PH_HBUSY_DAVAIL, 176 IEEE1284_PH_REV_DATA, 177 IEEE1284_PH_ECP_SETUP, 178 IEEE1284_PH_ECP_FWD_TO_REV, 179 IEEE1284_PH_ECP_REV_TO_FWD, 180 IEEE1284_PH_ECP_DIR_UNKNOWN, 181 }; 182 struct ieee1284_info { 183 int mode; 184 volatile enum ieee1284_phase phase; 185 struct semaphore irq; 186 }; 187 188 /* A parallel port */ 189 struct parport { 190 unsigned long base; /* base address */ 191 unsigned long base_hi; /* base address (hi - ECR) */ 192 unsigned int size; /* IO extent */ 193 const char *name; 194 unsigned int modes; 195 int irq; /* interrupt (or -1 for none) */ 196 int dma; 197 int muxport; /* which muxport (if any) this is */ 198 int portnum; /* which physical parallel port (not mux) */ 199 struct device *dev; /* Physical device associated with IO/DMA. 200 * This may unfortulately be null if the 201 * port has a legacy driver. 202 */ 203 struct device bus_dev; /* to link with the bus */ 204 struct parport *physport; 205 /* If this is a non-default mux 206 parport, i.e. we're a clone of a real 207 physical port, this is a pointer to that 208 port. The locking is only done in the 209 real port. For a clone port, the 210 following structure members are 211 meaningless: devices, cad, muxsel, 212 waithead, waittail, flags, pdir, 213 dev, ieee1284, *_lock. 214 215 It this is a default mux parport, or 216 there is no mux involved, this points to 217 ourself. */ 218 219 struct pardevice *devices; 220 struct pardevice *cad; /* port owner */ 221 int daisy; /* currently selected daisy addr */ 222 int muxsel; /* currently selected mux port */ 223 224 struct pardevice *waithead; 225 struct pardevice *waittail; 226 227 struct list_head list; 228 struct timer_list timer; 229 unsigned int flags; 230 231 void *sysctl_table; 232 struct parport_device_info probe_info[5]; /* 0-3 + non-IEEE1284.3 */ 233 struct ieee1284_info ieee1284; 234 235 struct parport_operations *ops; 236 void *private_data; /* for lowlevel driver */ 237 238 int number; /* port index - the `n' in `parportn' */ 239 spinlock_t pardevice_lock; 240 spinlock_t waitlist_lock; 241 rwlock_t cad_lock; 242 243 int spintime; 244 atomic_t ref_count; 245 246 unsigned long devflags; 247 #define PARPORT_DEVPROC_REGISTERED 0 248 struct pardevice *proc_device; /* Currently register proc device */ 249 250 struct list_head full_list; 251 struct parport *slaves[3]; 252 }; 253 254 #define to_parport_dev(n) container_of(n, struct parport, bus_dev) 255 256 #define DEFAULT_SPIN_TIME 500 /* us */ 257 258 struct parport_driver { 259 const char *name; 260 void (*attach) (struct parport *); 261 void (*detach) (struct parport *); 262 void (*match_port)(struct parport *); 263 int (*probe)(struct pardevice *); 264 struct device_driver driver; 265 bool devmodel; 266 struct list_head list; 267 }; 268 269 #define to_parport_driver(n) container_of(n, struct parport_driver, driver) 270 271 int parport_bus_init(void); 272 void parport_bus_exit(void); 273 274 /* parport_register_port registers a new parallel port at the given 275 address (if one does not already exist) and returns a pointer to it. 276 This entails claiming the I/O region, IRQ and DMA. NULL is returned 277 if initialisation fails. */ 278 struct parport *parport_register_port(unsigned long base, int irq, int dma, 279 struct parport_operations *ops); 280 281 /* Once a registered port is ready for high-level drivers to use, the 282 low-level driver that registered it should announce it. This will 283 call the high-level drivers' attach() functions (after things like 284 determining the IEEE 1284.3 topology of the port and collecting 285 DeviceIDs). */ 286 void parport_announce_port (struct parport *port); 287 288 /* Unregister a port. */ 289 extern void parport_remove_port(struct parport *port); 290 291 /* Register a new high-level driver. */ 292 293 int __must_check __parport_register_driver(struct parport_driver *, 294 struct module *, 295 const char *mod_name); 296 /* 297 * parport_register_driver must be a macro so that KBUILD_MODNAME can 298 * be expanded 299 */ 300 301 /** 302 * parport_register_driver - register a parallel port device driver 303 * @driver: structure describing the driver 304 * 305 * This can be called by a parallel port device driver in order 306 * to receive notifications about ports being found in the 307 * system, as well as ports no longer available. 308 * 309 * If devmodel is true then the new device model is used 310 * for registration. 311 * 312 * The @driver structure is allocated by the caller and must not be 313 * deallocated until after calling parport_unregister_driver(). 314 * 315 * If using the non device model: 316 * The driver's attach() function may block. The port that 317 * attach() is given will be valid for the duration of the 318 * callback, but if the driver wants to take a copy of the 319 * pointer it must call parport_get_port() to do so. Calling 320 * parport_register_device() on that port will do this for you. 321 * 322 * The driver's detach() function may block. The port that 323 * detach() is given will be valid for the duration of the 324 * callback, but if the driver wants to take a copy of the 325 * pointer it must call parport_get_port() to do so. 326 * 327 * 328 * Returns 0 on success. The non device model will always succeeds. 329 * but the new device model can fail and will return the error code. 330 **/ 331 #define parport_register_driver(driver) \ 332 __parport_register_driver(driver, THIS_MODULE, KBUILD_MODNAME) 333 334 /* Unregister a high-level driver. */ 335 extern void parport_unregister_driver (struct parport_driver *); 336 void parport_unregister_driver(struct parport_driver *); 337 338 /* If parport_register_driver doesn't fit your needs, perhaps 339 * parport_find_xxx does. */ 340 extern struct parport *parport_find_number (int); 341 extern struct parport *parport_find_base (unsigned long); 342 343 /* generic irq handler, if it suits your needs */ 344 extern irqreturn_t parport_irq_handler(int irq, void *dev_id); 345 346 /* Reference counting for ports. */ 347 extern struct parport *parport_get_port (struct parport *); 348 extern void parport_put_port (struct parport *); 349 void parport_del_port(struct parport *); 350 351 struct pardev_cb { 352 int (*preempt)(void *); 353 void (*wakeup)(void *); 354 void *private; 355 void (*irq_func)(void *); 356 unsigned int flags; 357 }; 358 359 /* 360 * parport_register_dev_model declares that a device is connected to a 361 * port, and tells the kernel all it needs to know. 362 */ 363 struct pardevice * 364 parport_register_dev_model(struct parport *port, const char *name, 365 const struct pardev_cb *par_dev_cb, int cnt); 366 367 /* parport_unregister unlinks a device from the chain. */ 368 extern void parport_unregister_device(struct pardevice *dev); 369 370 /* parport_claim tries to gain ownership of the port for a particular 371 driver. This may fail (return non-zero) if another driver is busy. 372 If this driver has registered an interrupt handler, it will be 373 enabled. */ 374 extern int parport_claim(struct pardevice *dev); 375 376 /* parport_claim_or_block is the same, but sleeps if the port cannot 377 be claimed. Return value is 1 if it slept, 0 normally and -errno 378 on error. */ 379 extern int parport_claim_or_block(struct pardevice *dev); 380 381 /* parport_release reverses a previous parport_claim. This can never 382 fail, though the effects are undefined (except that they are bad) 383 if you didn't previously own the port. Once you have released the 384 port you should make sure that neither your code nor the hardware 385 on the port tries to initiate any communication without first 386 re-claiming the port. If you mess with the port state (enabling 387 ECP for example) you should clean up before releasing the port. */ 388 389 extern void parport_release(struct pardevice *dev); 390 391 /** 392 * parport_yield - relinquish a parallel port temporarily 393 * @dev: a device on the parallel port 394 * 395 * This function relinquishes the port if it would be helpful to other 396 * drivers to do so. Afterwards it tries to reclaim the port using 397 * parport_claim(), and the return value is the same as for 398 * parport_claim(). If it fails, the port is left unclaimed and it is 399 * the driver's responsibility to reclaim the port. 400 * 401 * The parport_yield() and parport_yield_blocking() functions are for 402 * marking points in the driver at which other drivers may claim the 403 * port and use their devices. Yielding the port is similar to 404 * releasing it and reclaiming it, but is more efficient because no 405 * action is taken if there are no other devices needing the port. In 406 * fact, nothing is done even if there are other devices waiting but 407 * the current device is still within its "timeslice". The default 408 * timeslice is half a second, but it can be adjusted via the /proc 409 * interface. 410 **/ 411 static __inline__ int parport_yield(struct pardevice *dev) 412 { 413 unsigned long int timeslip = (jiffies - dev->time); 414 if ((dev->port->waithead == NULL) || (timeslip < dev->timeslice)) 415 return 0; 416 parport_release(dev); 417 return parport_claim(dev); 418 } 419 420 /** 421 * parport_yield_blocking - relinquish a parallel port temporarily 422 * @dev: a device on the parallel port 423 * 424 * This function relinquishes the port if it would be helpful to other 425 * drivers to do so. Afterwards it tries to reclaim the port using 426 * parport_claim_or_block(), and the return value is the same as for 427 * parport_claim_or_block(). 428 **/ 429 static __inline__ int parport_yield_blocking(struct pardevice *dev) 430 { 431 unsigned long int timeslip = (jiffies - dev->time); 432 if ((dev->port->waithead == NULL) || (timeslip < dev->timeslice)) 433 return 0; 434 parport_release(dev); 435 return parport_claim_or_block(dev); 436 } 437 438 /* Flags used to identify what a device does. */ 439 #define PARPORT_DEV_TRAN 0 /* WARNING !! DEPRECATED !! */ 440 #define PARPORT_DEV_LURK (1<<0) /* WARNING !! DEPRECATED !! */ 441 #define PARPORT_DEV_EXCL (1<<1) /* Need exclusive access. */ 442 443 #define PARPORT_FLAG_EXCL (1<<1) /* EXCL driver registered. */ 444 445 /* IEEE1284 functions */ 446 extern void parport_ieee1284_interrupt (void *); 447 extern int parport_negotiate (struct parport *, int mode); 448 extern ssize_t parport_write (struct parport *, const void *buf, size_t len); 449 extern ssize_t parport_read (struct parport *, void *buf, size_t len); 450 451 #define PARPORT_INACTIVITY_O_NONBLOCK 1 452 extern long parport_set_timeout (struct pardevice *, long inactivity); 453 454 extern int parport_wait_event (struct parport *, long timeout); 455 extern int parport_wait_peripheral (struct parport *port, 456 unsigned char mask, 457 unsigned char val); 458 extern int parport_poll_peripheral (struct parport *port, 459 unsigned char mask, 460 unsigned char val, 461 int usec); 462 463 /* For architectural drivers */ 464 extern size_t parport_ieee1284_write_compat (struct parport *, 465 const void *, size_t, int); 466 extern size_t parport_ieee1284_read_nibble (struct parport *, 467 void *, size_t, int); 468 extern size_t parport_ieee1284_read_byte (struct parport *, 469 void *, size_t, int); 470 extern size_t parport_ieee1284_ecp_read_data (struct parport *, 471 void *, size_t, int); 472 extern size_t parport_ieee1284_ecp_write_data (struct parport *, 473 const void *, size_t, int); 474 extern size_t parport_ieee1284_ecp_write_addr (struct parport *, 475 const void *, size_t, int); 476 extern size_t parport_ieee1284_epp_write_data (struct parport *, 477 const void *, size_t, int); 478 extern size_t parport_ieee1284_epp_read_data (struct parport *, 479 void *, size_t, int); 480 extern size_t parport_ieee1284_epp_write_addr (struct parport *, 481 const void *, size_t, int); 482 extern size_t parport_ieee1284_epp_read_addr (struct parport *, 483 void *, size_t, int); 484 485 /* IEEE1284.3 functions */ 486 #define daisy_dev_name "Device ID probe" 487 extern int parport_daisy_init (struct parport *port); 488 extern void parport_daisy_fini (struct parport *port); 489 extern struct pardevice *parport_open (int devnum, const char *name); 490 extern void parport_close (struct pardevice *dev); 491 extern ssize_t parport_device_id (int devnum, char *buffer, size_t len); 492 extern void parport_daisy_deselect_all (struct parport *port); 493 extern int parport_daisy_select (struct parport *port, int daisy, int mode); 494 495 /* Lowlevel drivers _can_ call this support function to handle irqs. */ 496 static inline void parport_generic_irq(struct parport *port) 497 { 498 parport_ieee1284_interrupt (port); 499 read_lock(&port->cad_lock); 500 if (port->cad && port->cad->irq_func) 501 port->cad->irq_func(port->cad->private); 502 read_unlock(&port->cad_lock); 503 } 504 505 /* Prototypes from parport_procfs */ 506 extern int parport_proc_register(struct parport *pp); 507 extern int parport_proc_unregister(struct parport *pp); 508 extern int parport_device_proc_register(struct pardevice *device); 509 extern int parport_device_proc_unregister(struct pardevice *device); 510 511 /* If PC hardware is the only type supported, we can optimise a bit. */ 512 #if !defined(CONFIG_PARPORT_NOT_PC) 513 514 #include <linux/parport_pc.h> 515 #define parport_write_data(p,x) parport_pc_write_data(p,x) 516 #define parport_read_data(p) parport_pc_read_data(p) 517 #define parport_write_control(p,x) parport_pc_write_control(p,x) 518 #define parport_read_control(p) parport_pc_read_control(p) 519 #define parport_frob_control(p,m,v) parport_pc_frob_control(p,m,v) 520 #define parport_read_status(p) parport_pc_read_status(p) 521 #define parport_enable_irq(p) parport_pc_enable_irq(p) 522 #define parport_disable_irq(p) parport_pc_disable_irq(p) 523 #define parport_data_forward(p) parport_pc_data_forward(p) 524 #define parport_data_reverse(p) parport_pc_data_reverse(p) 525 526 #else /* !CONFIG_PARPORT_NOT_PC */ 527 528 /* Generic operations vector through the dispatch table. */ 529 #define parport_write_data(p,x) (p)->ops->write_data(p,x) 530 #define parport_read_data(p) (p)->ops->read_data(p) 531 #define parport_write_control(p,x) (p)->ops->write_control(p,x) 532 #define parport_read_control(p) (p)->ops->read_control(p) 533 #define parport_frob_control(p,m,v) (p)->ops->frob_control(p,m,v) 534 #define parport_read_status(p) (p)->ops->read_status(p) 535 #define parport_enable_irq(p) (p)->ops->enable_irq(p) 536 #define parport_disable_irq(p) (p)->ops->disable_irq(p) 537 #define parport_data_forward(p) (p)->ops->data_forward(p) 538 #define parport_data_reverse(p) (p)->ops->data_reverse(p) 539 540 #endif /* !CONFIG_PARPORT_NOT_PC */ 541 542 extern unsigned long parport_default_timeslice; 543 extern int parport_default_spintime; 544 545 #endif /* _PARPORT_H_ */ 546