parport.h (19544B)
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. */ 21struct parport; 22struct pardevice; 23 24struct pc_parport_state { 25 unsigned int ctr; 26 unsigned int ecr; 27}; 28 29struct 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 */ 36struct 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 43struct ax88796_parport_state { 44 unsigned char cpr; 45}; 46 47struct ip32_parport_state { 48 unsigned int dcr; 49 unsigned int ecr; 50}; 51 52struct 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 65struct 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 116struct 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 */ 138struct 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. */ 168enum 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}; 182struct ieee1284_info { 183 int mode; 184 volatile enum ieee1284_phase phase; 185 struct semaphore irq; 186}; 187 188/* A parallel port */ 189struct 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 258struct 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 271int parport_bus_init(void); 272void 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. */ 278struct 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). */ 286void parport_announce_port (struct parport *port); 287 288/* Unregister a port. */ 289extern void parport_remove_port(struct parport *port); 290 291/* Register a new high-level driver. */ 292 293int __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. */ 335void parport_unregister_driver(struct parport_driver *); 336 337/** 338 * module_parport_driver() - Helper macro for registering a modular parport driver 339 * @__parport_driver: struct parport_driver to be used 340 * 341 * Helper macro for parport drivers which do not do anything special in module 342 * init and exit. This eliminates a lot of boilerplate. Each module may only 343 * use this macro once, and calling it replaces module_init() and module_exit(). 344 */ 345#define module_parport_driver(__parport_driver) \ 346 module_driver(__parport_driver, parport_register_driver, parport_unregister_driver) 347 348/* If parport_register_driver doesn't fit your needs, perhaps 349 * parport_find_xxx does. */ 350extern struct parport *parport_find_number (int); 351extern struct parport *parport_find_base (unsigned long); 352 353/* generic irq handler, if it suits your needs */ 354extern irqreturn_t parport_irq_handler(int irq, void *dev_id); 355 356/* Reference counting for ports. */ 357extern struct parport *parport_get_port (struct parport *); 358extern void parport_put_port (struct parport *); 359void parport_del_port(struct parport *); 360 361struct pardev_cb { 362 int (*preempt)(void *); 363 void (*wakeup)(void *); 364 void *private; 365 void (*irq_func)(void *); 366 unsigned int flags; 367}; 368 369/* 370 * parport_register_dev_model declares that a device is connected to a 371 * port, and tells the kernel all it needs to know. 372 */ 373struct pardevice * 374parport_register_dev_model(struct parport *port, const char *name, 375 const struct pardev_cb *par_dev_cb, int cnt); 376 377/* parport_unregister unlinks a device from the chain. */ 378extern void parport_unregister_device(struct pardevice *dev); 379 380/* parport_claim tries to gain ownership of the port for a particular 381 driver. This may fail (return non-zero) if another driver is busy. 382 If this driver has registered an interrupt handler, it will be 383 enabled. */ 384extern int parport_claim(struct pardevice *dev); 385 386/* parport_claim_or_block is the same, but sleeps if the port cannot 387 be claimed. Return value is 1 if it slept, 0 normally and -errno 388 on error. */ 389extern int parport_claim_or_block(struct pardevice *dev); 390 391/* parport_release reverses a previous parport_claim. This can never 392 fail, though the effects are undefined (except that they are bad) 393 if you didn't previously own the port. Once you have released the 394 port you should make sure that neither your code nor the hardware 395 on the port tries to initiate any communication without first 396 re-claiming the port. If you mess with the port state (enabling 397 ECP for example) you should clean up before releasing the port. */ 398 399extern void parport_release(struct pardevice *dev); 400 401/** 402 * parport_yield - relinquish a parallel port temporarily 403 * @dev: a device on the parallel port 404 * 405 * This function relinquishes the port if it would be helpful to other 406 * drivers to do so. Afterwards it tries to reclaim the port using 407 * parport_claim(), and the return value is the same as for 408 * parport_claim(). If it fails, the port is left unclaimed and it is 409 * the driver's responsibility to reclaim the port. 410 * 411 * The parport_yield() and parport_yield_blocking() functions are for 412 * marking points in the driver at which other drivers may claim the 413 * port and use their devices. Yielding the port is similar to 414 * releasing it and reclaiming it, but is more efficient because no 415 * action is taken if there are no other devices needing the port. In 416 * fact, nothing is done even if there are other devices waiting but 417 * the current device is still within its "timeslice". The default 418 * timeslice is half a second, but it can be adjusted via the /proc 419 * interface. 420 **/ 421static __inline__ int parport_yield(struct pardevice *dev) 422{ 423 unsigned long int timeslip = (jiffies - dev->time); 424 if ((dev->port->waithead == NULL) || (timeslip < dev->timeslice)) 425 return 0; 426 parport_release(dev); 427 return parport_claim(dev); 428} 429 430/** 431 * parport_yield_blocking - relinquish a parallel port temporarily 432 * @dev: a device on the parallel port 433 * 434 * This function relinquishes the port if it would be helpful to other 435 * drivers to do so. Afterwards it tries to reclaim the port using 436 * parport_claim_or_block(), and the return value is the same as for 437 * parport_claim_or_block(). 438 **/ 439static __inline__ int parport_yield_blocking(struct pardevice *dev) 440{ 441 unsigned long int timeslip = (jiffies - dev->time); 442 if ((dev->port->waithead == NULL) || (timeslip < dev->timeslice)) 443 return 0; 444 parport_release(dev); 445 return parport_claim_or_block(dev); 446} 447 448/* Flags used to identify what a device does. */ 449#define PARPORT_DEV_TRAN 0 /* WARNING !! DEPRECATED !! */ 450#define PARPORT_DEV_LURK (1<<0) /* WARNING !! DEPRECATED !! */ 451#define PARPORT_DEV_EXCL (1<<1) /* Need exclusive access. */ 452 453#define PARPORT_FLAG_EXCL (1<<1) /* EXCL driver registered. */ 454 455/* IEEE1284 functions */ 456extern void parport_ieee1284_interrupt (void *); 457extern int parport_negotiate (struct parport *, int mode); 458extern ssize_t parport_write (struct parport *, const void *buf, size_t len); 459extern ssize_t parport_read (struct parport *, void *buf, size_t len); 460 461#define PARPORT_INACTIVITY_O_NONBLOCK 1 462extern long parport_set_timeout (struct pardevice *, long inactivity); 463 464extern int parport_wait_event (struct parport *, long timeout); 465extern int parport_wait_peripheral (struct parport *port, 466 unsigned char mask, 467 unsigned char val); 468extern int parport_poll_peripheral (struct parport *port, 469 unsigned char mask, 470 unsigned char val, 471 int usec); 472 473/* For architectural drivers */ 474extern size_t parport_ieee1284_write_compat (struct parport *, 475 const void *, size_t, int); 476extern size_t parport_ieee1284_read_nibble (struct parport *, 477 void *, size_t, int); 478extern size_t parport_ieee1284_read_byte (struct parport *, 479 void *, size_t, int); 480extern size_t parport_ieee1284_ecp_read_data (struct parport *, 481 void *, size_t, int); 482extern size_t parport_ieee1284_ecp_write_data (struct parport *, 483 const void *, size_t, int); 484extern size_t parport_ieee1284_ecp_write_addr (struct parport *, 485 const void *, size_t, int); 486extern size_t parport_ieee1284_epp_write_data (struct parport *, 487 const void *, size_t, int); 488extern size_t parport_ieee1284_epp_read_data (struct parport *, 489 void *, size_t, int); 490extern size_t parport_ieee1284_epp_write_addr (struct parport *, 491 const void *, size_t, int); 492extern size_t parport_ieee1284_epp_read_addr (struct parport *, 493 void *, size_t, int); 494 495/* IEEE1284.3 functions */ 496#define daisy_dev_name "Device ID probe" 497extern int parport_daisy_init (struct parport *port); 498extern void parport_daisy_fini (struct parport *port); 499extern struct pardevice *parport_open (int devnum, const char *name); 500extern void parport_close (struct pardevice *dev); 501extern ssize_t parport_device_id (int devnum, char *buffer, size_t len); 502extern void parport_daisy_deselect_all (struct parport *port); 503extern int parport_daisy_select (struct parport *port, int daisy, int mode); 504 505/* Lowlevel drivers _can_ call this support function to handle irqs. */ 506static inline void parport_generic_irq(struct parport *port) 507{ 508 parport_ieee1284_interrupt (port); 509 read_lock(&port->cad_lock); 510 if (port->cad && port->cad->irq_func) 511 port->cad->irq_func(port->cad->private); 512 read_unlock(&port->cad_lock); 513} 514 515/* Prototypes from parport_procfs */ 516extern int parport_proc_register(struct parport *pp); 517extern int parport_proc_unregister(struct parport *pp); 518extern int parport_device_proc_register(struct pardevice *device); 519extern int parport_device_proc_unregister(struct pardevice *device); 520 521/* If PC hardware is the only type supported, we can optimise a bit. */ 522#if !defined(CONFIG_PARPORT_NOT_PC) 523 524#include <linux/parport_pc.h> 525#define parport_write_data(p,x) parport_pc_write_data(p,x) 526#define parport_read_data(p) parport_pc_read_data(p) 527#define parport_write_control(p,x) parport_pc_write_control(p,x) 528#define parport_read_control(p) parport_pc_read_control(p) 529#define parport_frob_control(p,m,v) parport_pc_frob_control(p,m,v) 530#define parport_read_status(p) parport_pc_read_status(p) 531#define parport_enable_irq(p) parport_pc_enable_irq(p) 532#define parport_disable_irq(p) parport_pc_disable_irq(p) 533#define parport_data_forward(p) parport_pc_data_forward(p) 534#define parport_data_reverse(p) parport_pc_data_reverse(p) 535 536#else /* !CONFIG_PARPORT_NOT_PC */ 537 538/* Generic operations vector through the dispatch table. */ 539#define parport_write_data(p,x) (p)->ops->write_data(p,x) 540#define parport_read_data(p) (p)->ops->read_data(p) 541#define parport_write_control(p,x) (p)->ops->write_control(p,x) 542#define parport_read_control(p) (p)->ops->read_control(p) 543#define parport_frob_control(p,m,v) (p)->ops->frob_control(p,m,v) 544#define parport_read_status(p) (p)->ops->read_status(p) 545#define parport_enable_irq(p) (p)->ops->enable_irq(p) 546#define parport_disable_irq(p) (p)->ops->disable_irq(p) 547#define parport_data_forward(p) (p)->ops->data_forward(p) 548#define parport_data_reverse(p) (p)->ops->data_reverse(p) 549 550#endif /* !CONFIG_PARPORT_NOT_PC */ 551 552extern unsigned long parport_default_timeslice; 553extern int parport_default_spintime; 554 555#endif /* _PARPORT_H_ */