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[PATCH] Remove unecessary NULL check in kernel/acct.c
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / include / linux / parport.h
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1da177e4
LT		 1/* $Id: parport.h,v 1.1 1998/05/17 10:57:52 andrea Exp andrea $ */
2
3/*
4 * Any part of this program may be used in documents licensed under
5 * the GNU Free Documentation License, Version 1.1 or any later version
6 * published by the Free Software Foundation.
7 */
8
9#ifndef _PARPORT_H_
10#define _PARPORT_H_
11
12/* Start off with user-visible constants */
13
14/* Maximum of 16 ports per machine */
15#define PARPORT_MAX 16
16
17/* Magic numbers */
18#define PARPORT_IRQ_NONE -1
19#define PARPORT_DMA_NONE -1
20#define PARPORT_IRQ_AUTO -2
21#define PARPORT_DMA_AUTO -2
22#define PARPORT_DMA_NOFIFO -3
23#define PARPORT_DISABLE -2
24#define PARPORT_IRQ_PROBEONLY -3
25#define PARPORT_IOHI_AUTO -1
26
27#define PARPORT_CONTROL_STROBE 0x1
28#define PARPORT_CONTROL_AUTOFD 0x2
29#define PARPORT_CONTROL_INIT 0x4
30#define PARPORT_CONTROL_SELECT 0x8
31
32#define PARPORT_STATUS_ERROR 0x8
33#define PARPORT_STATUS_SELECT 0x10
34#define PARPORT_STATUS_PAPEROUT 0x20
35#define PARPORT_STATUS_ACK 0x40
36#define PARPORT_STATUS_BUSY 0x80
37
38/* Type classes for Plug-and-Play probe. */
39typedef enum {
40 PARPORT_CLASS_LEGACY = 0, /* Non-IEEE1284 device */
41 PARPORT_CLASS_PRINTER,
42 PARPORT_CLASS_MODEM,
43 PARPORT_CLASS_NET,
44 PARPORT_CLASS_HDC, /* Hard disk controller */
45 PARPORT_CLASS_PCMCIA,
46 PARPORT_CLASS_MEDIA, /* Multimedia device */
47 PARPORT_CLASS_FDC, /* Floppy disk controller */
48 PARPORT_CLASS_PORTS,
49 PARPORT_CLASS_SCANNER,
50 PARPORT_CLASS_DIGCAM,
51 PARPORT_CLASS_OTHER, /* Anything else */
52 PARPORT_CLASS_UNSPEC, /* No CLS field in ID */
53 PARPORT_CLASS_SCSIADAPTER
54} parport_device_class;
55
56/* The "modes" entry in parport is a bit field representing the
57 capabilities of the hardware. */
58#define PARPORT_MODE_PCSPP (1<<0) /* IBM PC registers available. */
59#define PARPORT_MODE_TRISTATE (1<<1) /* Can tristate. */
60#define PARPORT_MODE_EPP (1<<2) /* Hardware EPP. */
61#define PARPORT_MODE_ECP (1<<3) /* Hardware ECP. */
62#define PARPORT_MODE_COMPAT (1<<4) /* Hardware 'printer protocol'. */
63#define PARPORT_MODE_DMA (1<<5) /* Hardware can DMA. */
64#define PARPORT_MODE_SAFEININT (1<<6) /* SPP registers accessible in IRQ. */
65
66/* IEEE1284 modes:
67 Nibble mode, byte mode, ECP, ECPRLE and EPP are their own
68 'extensibility request' values. Others are special.
69 'Real' ECP modes must have the IEEE1284_MODE_ECP bit set. */
70#define IEEE1284_MODE_NIBBLE 0
71#define IEEE1284_MODE_BYTE (1<<0)
72#define IEEE1284_MODE_COMPAT (1<<8)
73#define IEEE1284_MODE_BECP (1<<9) /* Bounded ECP mode */
74#define IEEE1284_MODE_ECP (1<<4)
75#define IEEE1284_MODE_ECPRLE (IEEE1284_MODE_ECP | (1<<5))
76#define IEEE1284_MODE_ECPSWE (1<<10) /* Software-emulated */
77#define IEEE1284_MODE_EPP (1<<6)
78#define IEEE1284_MODE_EPPSL (1<<11) /* EPP 1.7 */
79#define IEEE1284_MODE_EPPSWE (1<<12) /* Software-emulated */
80#define IEEE1284_DEVICEID (1<<2) /* This is a flag */
81#define IEEE1284_EXT_LINK (1<<14) /* This flag causes the
82 * extensibility link to
83 * be requested, using
84 * bits 0-6. */
85
86/* For the benefit of parport_read/write, you can use these with
87 * parport_negotiate to use address operations. They have no effect
88 * other than to make parport_read/write use address transfers. */
89#define IEEE1284_ADDR (1<<13) /* This is a flag */
90#define IEEE1284_DATA 0 /* So is this */
91
92/* Flags for block transfer operations. */
93#define PARPORT_EPP_FAST (1<<0) /* Unreliable counts. */
94#define PARPORT_W91284PIC (1<<1) /* have a Warp9 w91284pic in the device */
95
96/* The rest is for the kernel only */
97#ifdef __KERNEL__
98
1da177e4
LT		 99#include <linux/jiffies.h>
100#include <linux/proc_fs.h>
101#include <linux/spinlock.h>
102#include <linux/wait.h>
103#include <asm/system.h>
104#include <asm/ptrace.h>
105#include <asm/semaphore.h>
106
107/* Define this later. */
108struct parport;
109struct pardevice;
110
111struct pc_parport_state {
112 unsigned int ctr;
113 unsigned int ecr;
114};
115
116struct ax_parport_state {
117 unsigned int ctr;
118 unsigned int ecr;
119 unsigned int dcsr;
120};
121
122/* used by both parport_amiga and parport_mfc3 */
123struct amiga_parport_state {
124 unsigned char data; /* ciaa.prb */
125 unsigned char datadir; /* ciaa.ddrb */
126 unsigned char status; /* ciab.pra & 7 */
127 unsigned char statusdir;/* ciab.ddrb & 7 */
128};
129
8e75f744
AG		 130struct ip32_parport_state {
131 unsigned int dcr;
132 unsigned int ecr;
133};
134
1da177e4
LT		 135struct parport_state {
136 union {
137 struct pc_parport_state pc;
138 /* ARC has no state. */
139 struct ax_parport_state ax;
140 struct amiga_parport_state amiga;
141 /* Atari has not state. */
8e75f744 142 struct ip32_parport_state ip32;
1da177e4
LT		 143 void *misc;
144 } u;
145};
146
147struct parport_operations {
148 /* IBM PC-style virtual registers. */
149 void (*write_data)(struct parport *, unsigned char);
150 unsigned char (*read_data)(struct parport *);
151
152 void (*write_control)(struct parport *, unsigned char);
153 unsigned char (*read_control)(struct parport *);
154 unsigned char (*frob_control)(struct parport *, unsigned char mask,
155 unsigned char val);
156
157 unsigned char (*read_status)(struct parport *);
158
159 /* IRQs. */
160 void (*enable_irq)(struct parport *);
161 void (*disable_irq)(struct parport *);
162
163 /* Data direction. */
164 void (*data_forward) (struct parport *);
165 void (*data_reverse) (struct parport *);
166
167 /* For core parport code. */
168 void (*init_state)(struct pardevice *, struct parport_state *);
169 void (*save_state)(struct parport *, struct parport_state *);
170 void (*restore_state)(struct parport *, struct parport_state *);
171
172 /* Block read/write */
173 size_t (*epp_write_data) (struct parport *port, const void *buf,
174 size_t len, int flags);
175 size_t (*epp_read_data) (struct parport *port, void *buf, size_t len,
176 int flags);
177 size_t (*epp_write_addr) (struct parport *port, const void *buf,
178 size_t len, int flags);
179 size_t (*epp_read_addr) (struct parport *port, void *buf, size_t len,
180 int flags);
181
182 size_t (*ecp_write_data) (struct parport *port, const void *buf,
183 size_t len, int flags);
184 size_t (*ecp_read_data) (struct parport *port, void *buf, size_t len,
185 int flags);
186 size_t (*ecp_write_addr) (struct parport *port, const void *buf,
187 size_t len, int flags);
188
189 size_t (*compat_write_data) (struct parport *port, const void *buf,
190 size_t len, int flags);
191 size_t (*nibble_read_data) (struct parport *port, void *buf,
192 size_t len, int flags);
193 size_t (*byte_read_data) (struct parport *port, void *buf,
194 size_t len, int flags);
195 struct module *owner;
196};
197
198struct parport_device_info {
199 parport_device_class class;
200 const char *class_name;
201 const char *mfr;
202 const char *model;
203 const char *cmdset;
204 const char *description;
205};
206
207/* Each device can have two callback functions:
208 * 1) a preemption function, called by the resource manager to request
209 * that the driver relinquish control of the port. The driver should
210 * return zero if it agrees to release the port, and nonzero if it
211 * refuses. Do not call parport_release() - the kernel will do this
212 * implicitly.
213 *
214 * 2) a wake-up function, called by the resource manager to tell drivers
215 * that the port is available to be claimed. If a driver wants to use
216 * the port, it should call parport_claim() here.
217 */
218
219/* A parallel port device */
220struct pardevice {
221 const char *name;
222 struct parport *port;
223 int daisy;
224 int (*preempt)(void *);
225 void (*wakeup)(void *);
226 void *private;
227 void (*irq_func)(int, void *, struct pt_regs *);
228 unsigned int flags;
229 struct pardevice *next;
230 struct pardevice *prev;
231 struct parport_state *state; /* saved status over preemption */
232 wait_queue_head_t wait_q;
233 unsigned long int time;
234 unsigned long int timeslice;
235 volatile long int timeout;
236 unsigned long waiting; /* long req'd for set_bit --RR */
237 struct pardevice *waitprev;
238 struct pardevice *waitnext;
239 void * sysctl_table;
240};
241
242/* IEEE1284 information */
243
d8a33496
MK		 244/* IEEE1284 phases. These are exposed to userland through ppdev IOCTL
245 * PP[GS]ETPHASE, so do not change existing values. */
1da177e4
LT		 246enum ieee1284_phase {
247 IEEE1284_PH_FWD_DATA,
248 IEEE1284_PH_FWD_IDLE,
249 IEEE1284_PH_TERMINATE,
250 IEEE1284_PH_NEGOTIATION,
d8a33496 251 IEEE1284_PH_HBUSY_DNA,
1da177e4
LT		 252 IEEE1284_PH_REV_IDLE,
253 IEEE1284_PH_HBUSY_DAVAIL,
254 IEEE1284_PH_REV_DATA,
255 IEEE1284_PH_ECP_SETUP,
256 IEEE1284_PH_ECP_FWD_TO_REV,
257 IEEE1284_PH_ECP_REV_TO_FWD,
258 IEEE1284_PH_ECP_DIR_UNKNOWN,
259};
260struct ieee1284_info {
261 int mode;
262 volatile enum ieee1284_phase phase;
263 struct semaphore irq;
264};
265
266/* A parallel port */
267struct parport {
268 unsigned long base; /* base address */
269 unsigned long base_hi; /* base address (hi - ECR) */
270 unsigned int size; /* IO extent */
271 const char *name;
272 unsigned int modes;
273 int irq; /* interrupt (or -1 for none) */
274 int dma;
275 int muxport; /* which muxport (if any) this is */
276 int portnum; /* which physical parallel port (not mux) */
277
278 struct parport *physport;
279 /* If this is a non-default mux
280 parport, i.e. we're a clone of a real
281 physical port, this is a pointer to that
282 port. The locking is only done in the
283 real port. For a clone port, the
284 following structure members are
285 meaningless: devices, cad, muxsel,
286 waithead, waittail, flags, pdir,
287 ieee1284, *_lock.
288
289 It this is a default mux parport, or
290 there is no mux involved, this points to
291 ourself. */
292
293 struct pardevice *devices;
294 struct pardevice *cad; /* port owner */
295 int daisy; /* currently selected daisy addr */
296 int muxsel; /* currently selected mux port */
297
298 struct pardevice *waithead;
299 struct pardevice *waittail;
300
301 struct list_head list;
302 unsigned int flags;
303
304 void *sysctl_table;
305 struct parport_device_info probe_info[5]; /* 0-3 + non-IEEE1284.3 */
306 struct ieee1284_info ieee1284;
307
308 struct parport_operations *ops;
309 void *private_data; /* for lowlevel driver */
310
311 int number; /* port index - the `n' in `parportn' */
312 spinlock_t pardevice_lock;
313 spinlock_t waitlist_lock;
314 rwlock_t cad_lock;
315
316 int spintime;
317 atomic_t ref_count;
318
319 struct list_head full_list;
320 struct parport *slaves[3];
321};
322
323#define DEFAULT_SPIN_TIME 500 /* us */
324
325struct parport_driver {
326 const char *name;
327 void (*attach) (struct parport *);
328 void (*detach) (struct parport *);
329 struct list_head list;
330};
331
332/* parport_register_port registers a new parallel port at the given
333 address (if one does not already exist) and returns a pointer to it.
334 This entails claiming the I/O region, IRQ and DMA. NULL is returned
335 if initialisation fails. */
336struct parport *parport_register_port(unsigned long base, int irq, int dma,
337 struct parport_operations *ops);
338
339/* Once a registered port is ready for high-level drivers to use, the
340 low-level driver that registered it should announce it. This will
341 call the high-level drivers' attach() functions (after things like
342 determining the IEEE 1284.3 topology of the port and collecting
343 DeviceIDs). */
344void parport_announce_port (struct parport *port);
345
346/* Unregister a port. */
347extern void parport_remove_port(struct parport *port);
348
349/* Register a new high-level driver. */
350extern int parport_register_driver (struct parport_driver *);
351
352/* Unregister a high-level driver. */
353extern void parport_unregister_driver (struct parport_driver *);
354
355/* If parport_register_driver doesn't fit your needs, perhaps
356 * parport_find_xxx does. */
357extern struct parport *parport_find_number (int);
358extern struct parport *parport_find_base (unsigned long);
359
360/* Reference counting for ports. */
361extern struct parport *parport_get_port (struct parport *);
362extern void parport_put_port (struct parport *);
363
364/* parport_register_device declares that a device is connected to a
365 port, and tells the kernel all it needs to know.
366 - pf is the preemption function (may be NULL for no callback)
367 - kf is the wake-up function (may be NULL for no callback)
368 - irq_func is the interrupt handler (may be NULL for no interrupts)
369 - handle is a user pointer that gets handed to callback functions. */
370struct pardevice *parport_register_device(struct parport *port,
371 const char *name,
372 int (*pf)(void *), void (*kf)(void *),
373 void (*irq_func)(int, void *, struct pt_regs *),
374 int flags, void *handle);
375
376/* parport_unregister unlinks a device from the chain. */
377extern void parport_unregister_device(struct pardevice *dev);
378
379/* parport_claim tries to gain ownership of the port for a particular
380 driver. This may fail (return non-zero) if another driver is busy.
381 If this driver has registered an interrupt handler, it will be
382 enabled. */
383extern int parport_claim(struct pardevice *dev);
384
385/* parport_claim_or_block is the same, but sleeps if the port cannot
386 be claimed. Return value is 1 if it slept, 0 normally and -errno
387 on error. */
388extern int parport_claim_or_block(struct pardevice *dev);
389
390/* parport_release reverses a previous parport_claim. This can never
391 fail, though the effects are undefined (except that they are bad)
392 if you didn't previously own the port. Once you have released the
393 port you should make sure that neither your code nor the hardware
394 on the port tries to initiate any communication without first
395 re-claiming the port. If you mess with the port state (enabling
396 ECP for example) you should clean up before releasing the port. */
397
398extern void parport_release(struct pardevice *dev);
399
400/**
401 * parport_yield - relinquish a parallel port temporarily
402 * @dev: a device on the parallel port
403 *
404 * This function relinquishes the port if it would be helpful to other
405 * drivers to do so. Afterwards it tries to reclaim the port using
406 * parport_claim(), and the return value is the same as for
407 * parport_claim(). If it fails, the port is left unclaimed and it is
408 * the driver's responsibility to reclaim the port.
409 *
410 * The parport_yield() and parport_yield_blocking() functions are for
411 * marking points in the driver at which other drivers may claim the
412 * port and use their devices. Yielding the port is similar to
413 * releasing it and reclaiming it, but is more efficient because no
414 * action is taken if there are no other devices needing the port. In
415 * fact, nothing is done even if there are other devices waiting but
416 * the current device is still within its "timeslice". The default
417 * timeslice is half a second, but it can be adjusted via the /proc
418 * interface.
419 **/
420static __inline__ int parport_yield(struct pardevice *dev)
421{
422 unsigned long int timeslip = (jiffies - dev->time);
423 if ((dev->port->waithead == NULL) || (timeslip < dev->timeslice))
424 return 0;
425 parport_release(dev);
426 return parport_claim(dev);
427}
428
429/**
430 * parport_yield_blocking - relinquish a parallel port temporarily
431 * @dev: a device on the parallel port
432 *
433 * This function relinquishes the port if it would be helpful to other
434 * drivers to do so. Afterwards it tries to reclaim the port using
435 * parport_claim_or_block(), and the return value is the same as for
436 * parport_claim_or_block().
437 **/
438static __inline__ int parport_yield_blocking(struct pardevice *dev)
439{
440 unsigned long int timeslip = (jiffies - dev->time);
441 if ((dev->port->waithead == NULL) || (timeslip < dev->timeslice))
442 return 0;
443 parport_release(dev);
444 return parport_claim_or_block(dev);
445}
446
447/* Flags used to identify what a device does. */
448#define PARPORT_DEV_TRAN 0 /* WARNING !! DEPRECATED !! */
449#define PARPORT_DEV_LURK (1<<0) /* WARNING !! DEPRECATED !! */
450#define PARPORT_DEV_EXCL (1<<1) /* Need exclusive access. */
451
452#define PARPORT_FLAG_EXCL (1<<1) /* EXCL driver registered. */
453
454/* IEEE1284 functions */
455extern void parport_ieee1284_interrupt (int, void *, struct pt_regs *);
456extern int parport_negotiate (struct parport *, int mode);
457extern ssize_t parport_write (struct parport *, const void *buf, size_t len);
458extern ssize_t parport_read (struct parport *, void *buf, size_t len);
459
460#define PARPORT_INACTIVITY_O_NONBLOCK 1
461extern long parport_set_timeout (struct pardevice *, long inactivity);
462
463extern int parport_wait_event (struct parport *, long timeout);
464extern int parport_wait_peripheral (struct parport *port,
465 unsigned char mask,
466 unsigned char val);
467extern int parport_poll_peripheral (struct parport *port,
468 unsigned char mask,
469 unsigned char val,
470 int usec);
471
472/* For architectural drivers */
473extern size_t parport_ieee1284_write_compat (struct parport *,
474 const void *, size_t, int);
475extern size_t parport_ieee1284_read_nibble (struct parport *,
476 void *, size_t, int);
477extern size_t parport_ieee1284_read_byte (struct parport *,
478 void *, size_t, int);
479extern size_t parport_ieee1284_ecp_read_data (struct parport *,
480 void *, size_t, int);
481extern size_t parport_ieee1284_ecp_write_data (struct parport *,
482 const void *, size_t, int);
483extern size_t parport_ieee1284_ecp_write_addr (struct parport *,
484 const void *, size_t, int);
485extern size_t parport_ieee1284_epp_write_data (struct parport *,
486 const void *, size_t, int);
487extern size_t parport_ieee1284_epp_read_data (struct parport *,
488 void *, size_t, int);
489extern size_t parport_ieee1284_epp_write_addr (struct parport *,
490 const void *, size_t, int);
491extern size_t parport_ieee1284_epp_read_addr (struct parport *,
492 void *, size_t, int);
493
494/* IEEE1284.3 functions */
495extern int parport_daisy_init (struct parport *port);
496extern void parport_daisy_fini (struct parport *port);
497extern struct pardevice *parport_open (int devnum, const char *name,
498 int (*pf) (void *),
499 void (*kf) (void *),
500 void (*irqf) (int, void *,
501 struct pt_regs *),
502 int flags, void *handle);
503extern void parport_close (struct pardevice *dev);
504extern ssize_t parport_device_id (int devnum, char *buffer, size_t len);
505extern int parport_device_num (int parport, int mux, int daisy);
506extern void parport_daisy_deselect_all (struct parport *port);
507extern int parport_daisy_select (struct parport *port, int daisy, int mode);
508
509/* Lowlevel drivers _can_ call this support function to handle irqs. */
510static __inline__ void parport_generic_irq(int irq, struct parport *port,
511 struct pt_regs *regs)
512{
513 parport_ieee1284_interrupt (irq, port, regs);
514 read_lock(&port->cad_lock);
515 if (port->cad && port->cad->irq_func)
516 port->cad->irq_func(irq, port->cad->private, regs);
517 read_unlock(&port->cad_lock);
518}
519
520/* Prototypes from parport_procfs */
521extern int parport_proc_register(struct parport *pp);
522extern int parport_proc_unregister(struct parport *pp);
523extern int parport_device_proc_register(struct pardevice *device);
524extern int parport_device_proc_unregister(struct pardevice *device);
525
526/* If PC hardware is the only type supported, we can optimise a bit. */
527#if !defined(CONFIG_PARPORT_NOT_PC)
528
529#include <linux/parport_pc.h>
530#define parport_write_data(p,x) parport_pc_write_data(p,x)
531#define parport_read_data(p) parport_pc_read_data(p)
532#define parport_write_control(p,x) parport_pc_write_control(p,x)
533#define parport_read_control(p) parport_pc_read_control(p)
534#define parport_frob_control(p,m,v) parport_pc_frob_control(p,m,v)
535#define parport_read_status(p) parport_pc_read_status(p)
536#define parport_enable_irq(p) parport_pc_enable_irq(p)
537#define parport_disable_irq(p) parport_pc_disable_irq(p)
538#define parport_data_forward(p) parport_pc_data_forward(p)
539#define parport_data_reverse(p) parport_pc_data_reverse(p)
540
541#else /* !CONFIG_PARPORT_NOT_PC */
542
543/* Generic operations vector through the dispatch table. */
544#define parport_write_data(p,x) (p)->ops->write_data(p,x)
545#define parport_read_data(p) (p)->ops->read_data(p)
546#define parport_write_control(p,x) (p)->ops->write_control(p,x)
547#define parport_read_control(p) (p)->ops->read_control(p)
548#define parport_frob_control(p,m,v) (p)->ops->frob_control(p,m,v)
549#define parport_read_status(p) (p)->ops->read_status(p)
550#define parport_enable_irq(p) (p)->ops->enable_irq(p)
551#define parport_disable_irq(p) (p)->ops->disable_irq(p)
552#define parport_data_forward(p) (p)->ops->data_forward(p)
553#define parport_data_reverse(p) (p)->ops->data_reverse(p)
554
555#endif /* !CONFIG_PARPORT_NOT_PC */
556
557#endif /* __KERNEL__ */
558#endif /* _PARPORT_H_ */
kernel source for telekom puls (alcatel/mediatek)