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 #define parport_register_driver(driver) \
301 __parport_register_driver(driver, THIS_MODULE, KBUILD_MODNAME)
302
303 /* Unregister a high-level driver. */
304 extern void parport_unregister_driver (struct parport_driver *);
305 void parport_unregister_driver(struct parport_driver *);
306
307 /* If parport_register_driver doesn't fit your needs, perhaps
308 * parport_find_xxx does. */
309 extern struct parport *parport_find_number (int);
310 extern struct parport *parport_find_base (unsigned long);
311
312 /* generic irq handler, if it suits your needs */
313 extern irqreturn_t parport_irq_handler(int irq, void *dev_id);
314
315 /* Reference counting for ports. */
316 extern struct parport *parport_get_port (struct parport *);
317 extern void parport_put_port (struct parport *);
318 void parport_del_port(struct parport *);
319
320 struct pardev_cb {
321 int (*preempt)(void *);
322 void (*wakeup)(void *);
323 void *private;
324 void (*irq_func)(void *);
325 unsigned int flags;
326 };
327
328 /*
329 * parport_register_dev_model declares that a device is connected to a
330 * port, and tells the kernel all it needs to know.
331 */
332 struct pardevice *
333 parport_register_dev_model(struct parport *port, const char *name,
334 const struct pardev_cb *par_dev_cb, int cnt);
335
336 /* parport_unregister unlinks a device from the chain. */
337 extern void parport_unregister_device(struct pardevice *dev);
338
339 /* parport_claim tries to gain ownership of the port for a particular
340 driver. This may fail (return non-zero) if another driver is busy.
341 If this driver has registered an interrupt handler, it will be
342 enabled. */
343 extern int parport_claim(struct pardevice *dev);
344
345 /* parport_claim_or_block is the same, but sleeps if the port cannot
346 be claimed. Return value is 1 if it slept, 0 normally and -errno
347 on error. */
348 extern int parport_claim_or_block(struct pardevice *dev);
349
350 /* parport_release reverses a previous parport_claim. This can never
351 fail, though the effects are undefined (except that they are bad)
352 if you didn't previously own the port. Once you have released the
353 port you should make sure that neither your code nor the hardware
354 on the port tries to initiate any communication without first
355 re-claiming the port. If you mess with the port state (enabling
356 ECP for example) you should clean up before releasing the port. */
357
358 extern void parport_release(struct pardevice *dev);
359
360 /**
361 * parport_yield - relinquish a parallel port temporarily
362 * @dev: a device on the parallel port
363 *
364 * This function relinquishes the port if it would be helpful to other
365 * drivers to do so. Afterwards it tries to reclaim the port using
366 * parport_claim(), and the return value is the same as for
367 * parport_claim(). If it fails, the port is left unclaimed and it is
368 * the driver's responsibility to reclaim the port.
369 *
370 * The parport_yield() and parport_yield_blocking() functions are for
371 * marking points in the driver at which other drivers may claim the
372 * port and use their devices. Yielding the port is similar to
373 * releasing it and reclaiming it, but is more efficient because no
374 * action is taken if there are no other devices needing the port. In
375 * fact, nothing is done even if there are other devices waiting but
376 * the current device is still within its "timeslice". The default
377 * timeslice is half a second, but it can be adjusted via the /proc
378 * interface.
379 **/
parport_yield(struct pardevice * dev)380 static __inline__ int parport_yield(struct pardevice *dev)
381 {
382 unsigned long int timeslip = (jiffies - dev->time);
383 if ((dev->port->waithead == NULL) || (timeslip < dev->timeslice))
384 return 0;
385 parport_release(dev);
386 return parport_claim(dev);
387 }
388
389 /**
390 * parport_yield_blocking - relinquish a parallel port temporarily
391 * @dev: a device on the parallel port
392 *
393 * This function relinquishes the port if it would be helpful to other
394 * drivers to do so. Afterwards it tries to reclaim the port using
395 * parport_claim_or_block(), and the return value is the same as for
396 * parport_claim_or_block().
397 **/
parport_yield_blocking(struct pardevice * dev)398 static __inline__ int parport_yield_blocking(struct pardevice *dev)
399 {
400 unsigned long int timeslip = (jiffies - dev->time);
401 if ((dev->port->waithead == NULL) || (timeslip < dev->timeslice))
402 return 0;
403 parport_release(dev);
404 return parport_claim_or_block(dev);
405 }
406
407 /* Flags used to identify what a device does. */
408 #define PARPORT_DEV_TRAN 0 /* WARNING !! DEPRECATED !! */
409 #define PARPORT_DEV_LURK (1<<0) /* WARNING !! DEPRECATED !! */
410 #define PARPORT_DEV_EXCL (1<<1) /* Need exclusive access. */
411
412 #define PARPORT_FLAG_EXCL (1<<1) /* EXCL driver registered. */
413
414 /* IEEE1284 functions */
415 extern void parport_ieee1284_interrupt (void *);
416 extern int parport_negotiate (struct parport *, int mode);
417 extern ssize_t parport_write (struct parport *, const void *buf, size_t len);
418 extern ssize_t parport_read (struct parport *, void *buf, size_t len);
419
420 #define PARPORT_INACTIVITY_O_NONBLOCK 1
421 extern long parport_set_timeout (struct pardevice *, long inactivity);
422
423 extern int parport_wait_event (struct parport *, long timeout);
424 extern int parport_wait_peripheral (struct parport *port,
425 unsigned char mask,
426 unsigned char val);
427 extern int parport_poll_peripheral (struct parport *port,
428 unsigned char mask,
429 unsigned char val,
430 int usec);
431
432 /* For architectural drivers */
433 extern size_t parport_ieee1284_write_compat (struct parport *,
434 const void *, size_t, int);
435 extern size_t parport_ieee1284_read_nibble (struct parport *,
436 void *, size_t, int);
437 extern size_t parport_ieee1284_read_byte (struct parport *,
438 void *, size_t, int);
439 extern size_t parport_ieee1284_ecp_read_data (struct parport *,
440 void *, size_t, int);
441 extern size_t parport_ieee1284_ecp_write_data (struct parport *,
442 const void *, size_t, int);
443 extern size_t parport_ieee1284_ecp_write_addr (struct parport *,
444 const void *, size_t, int);
445 extern size_t parport_ieee1284_epp_write_data (struct parport *,
446 const void *, size_t, int);
447 extern size_t parport_ieee1284_epp_read_data (struct parport *,
448 void *, size_t, int);
449 extern size_t parport_ieee1284_epp_write_addr (struct parport *,
450 const void *, size_t, int);
451 extern size_t parport_ieee1284_epp_read_addr (struct parport *,
452 void *, size_t, int);
453
454 /* IEEE1284.3 functions */
455 #define daisy_dev_name "Device ID probe"
456 extern int parport_daisy_init (struct parport *port);
457 extern void parport_daisy_fini (struct parport *port);
458 extern struct pardevice *parport_open (int devnum, const char *name);
459 extern void parport_close (struct pardevice *dev);
460 extern ssize_t parport_device_id (int devnum, char *buffer, size_t len);
461 extern void parport_daisy_deselect_all (struct parport *port);
462 extern int parport_daisy_select (struct parport *port, int daisy, int mode);
463
464 /* Lowlevel drivers _can_ call this support function to handle irqs. */
parport_generic_irq(struct parport * port)465 static inline void parport_generic_irq(struct parport *port)
466 {
467 parport_ieee1284_interrupt (port);
468 read_lock(&port->cad_lock);
469 if (port->cad && port->cad->irq_func)
470 port->cad->irq_func(port->cad->private);
471 read_unlock(&port->cad_lock);
472 }
473
474 /* Prototypes from parport_procfs */
475 extern int parport_proc_register(struct parport *pp);
476 extern int parport_proc_unregister(struct parport *pp);
477 extern int parport_device_proc_register(struct pardevice *device);
478 extern int parport_device_proc_unregister(struct pardevice *device);
479
480 /* If PC hardware is the only type supported, we can optimise a bit. */
481 #if !defined(CONFIG_PARPORT_NOT_PC)
482
483 #include <linux/parport_pc.h>
484 #define parport_write_data(p,x) parport_pc_write_data(p,x)
485 #define parport_read_data(p) parport_pc_read_data(p)
486 #define parport_write_control(p,x) parport_pc_write_control(p,x)
487 #define parport_read_control(p) parport_pc_read_control(p)
488 #define parport_frob_control(p,m,v) parport_pc_frob_control(p,m,v)
489 #define parport_read_status(p) parport_pc_read_status(p)
490 #define parport_enable_irq(p) parport_pc_enable_irq(p)
491 #define parport_disable_irq(p) parport_pc_disable_irq(p)
492 #define parport_data_forward(p) parport_pc_data_forward(p)
493 #define parport_data_reverse(p) parport_pc_data_reverse(p)
494
495 #else /* !CONFIG_PARPORT_NOT_PC */
496
497 /* Generic operations vector through the dispatch table. */
498 #define parport_write_data(p,x) (p)->ops->write_data(p,x)
499 #define parport_read_data(p) (p)->ops->read_data(p)
500 #define parport_write_control(p,x) (p)->ops->write_control(p,x)
501 #define parport_read_control(p) (p)->ops->read_control(p)
502 #define parport_frob_control(p,m,v) (p)->ops->frob_control(p,m,v)
503 #define parport_read_status(p) (p)->ops->read_status(p)
504 #define parport_enable_irq(p) (p)->ops->enable_irq(p)
505 #define parport_disable_irq(p) (p)->ops->disable_irq(p)
506 #define parport_data_forward(p) (p)->ops->data_forward(p)
507 #define parport_data_reverse(p) (p)->ops->data_reverse(p)
508
509 #endif /* !CONFIG_PARPORT_NOT_PC */
510
511 extern unsigned long parport_default_timeslice;
512 extern int parport_default_spintime;
513
514 #endif /* _PARPORT_H_ */
515