/*
* Any part of this program may be used in documents licensed under
* the GNU Free Documentation License , Version 1 . 1 or any later version
* published by the Free Software Foundation .
*/
#ifndef _PARPORT_H_
#define _PARPORT_H_
#include <linux/jiffies.h>
#include <linux/proc_fs.h>
#include <linux/spinlock.h>
#include <linux/wait.h>
#include <linux/irqreturn.h>
#include <linux/semaphore.h>
#include <linux/device.h>
#include <asm /ptrace.h>
#include <uapi/linux/parport.h>
/* Define this later. */
struct parport;
struct pardevice;
struct pc_parport_state {
unsigned int ctr;
unsigned int ecr;
};
struct ax_parport_state {
unsigned int ctr;
unsigned int ecr;
unsigned int dcsr;
};
/* used by both parport_amiga and parport_mfc3 */
struct amiga_parport_state {
unsigned char data; /* ciaa.prb */
unsigned char datadir; /* ciaa.ddrb */
unsigned char status; /* ciab.pra & 7 */
unsigned char statusdir;/* ciab.ddrb & 7 */
};
struct ip32_parport_state {
unsigned int dcr;
unsigned int ecr;
};
struct parport_state {
union {
struct pc_parport_state pc;
/* ARC has no state. */
struct ax_parport_state ax;
struct amiga_parport_state amiga;
/* Atari has not state. */
struct ip32_parport_state ip32;
void *misc;
} u;
};
struct parport_operations {
/* IBM PC-style virtual registers. */
void (*write_data)(struct parport *, unsigned char );
unsigned char (*read_data)(struct parport *);
void (*write_control)(struct parport *, unsigned char );
unsigned char (*read_control)(struct parport *);
unsigned char (*frob_control)(struct parport *, unsigned char mask,
unsigned char val);
unsigned char (*read_status)(struct parport *);
/* IRQs. */
void (*enable_irq)(struct parport *);
void (*disable_irq)(struct parport *);
/* Data direction. */
void (*data_forward) (struct parport *);
void (*data_reverse) (struct parport *);
/* For core parport code. */
void (*init_state)(struct pardevice *, struct parport_state *);
void (*save_state)(struct parport *, struct parport_state *);
void (*restore_state)(struct parport *, struct parport_state *);
/* Block read/write */
size_t (*epp_write_data) (struct parport *port, const void *buf,
size_t len, int flags);
size_t (*epp_read_data) (struct parport *port, void *buf, size_t len,
int flags);
size_t (*epp_write_addr) (struct parport *port, const void *buf,
size_t len, int flags);
size_t (*epp_read_addr) (struct parport *port, void *buf, size_t len,
int flags);
size_t (*ecp_write_data) (struct parport *port, const void *buf,
size_t len, int flags);
size_t (*ecp_read_data) (struct parport *port, void *buf, size_t len,
int flags);
size_t (*ecp_write_addr) (struct parport *port, const void *buf,
size_t len, int flags);
size_t (*compat_write_data) (struct parport *port, const void *buf,
size_t len, int flags);
size_t (*nibble_read_data) (struct parport *port, void *buf,
size_t len, int flags);
size_t (*byte_read_data) (struct parport *port, void *buf,
size_t len, int flags);
struct module *owner;
};
struct parport_device_info {
parport_device_class class ;
const char *class_name;
const char *mfr;
const char *model;
const char *cmdset;
const char *description;
};
/* Each device can have two callback functions:
* 1 ) a preemption function , called by the resource manager to request
* that the driver relinquish control of the port . The driver should
* return zero if it agrees to release the port , and nonzero if it
* refuses . Do not call parport_release ( ) - the kernel will do this
* implicitly .
*
* 2 ) a wake - up function , called by the resource manager to tell drivers
* that the port is available to be claimed . If a driver wants to use
* the port , it should call parport_claim ( ) here .
*/
/* A parallel port device */
struct pardevice {
const char *name;
struct parport *port;
int daisy;
int (*preempt)(void *);
void (*wakeup)(void *);
void *private ;
void (*irq_func)(void *);
unsigned int flags;
struct pardevice *next;
struct pardevice *prev;
struct device dev;
bool devmodel;
struct parport_state *state; /* saved status over preemption */
wait_queue_head_t wait_q;
unsigned long int time;
unsigned long int timeslice;
volatile long int timeout;
unsigned long waiting; /* long req'd for set_bit --RR */
struct pardevice *waitprev;
struct pardevice *waitnext;
void * sysctl_table;
};
#define to_pardevice(n) container_of(n, struct pardevice, dev)
/* IEEE1284 information */
/* IEEE1284 phases. These are exposed to userland through ppdev IOCTL
* PP[GS]ETPHASE, so do not change existing values. */
enum ieee1284_phase {
IEEE1284_PH_FWD_DATA,
IEEE1284_PH_FWD_IDLE,
IEEE1284_PH_TERMINATE,
IEEE1284_PH_NEGOTIATION,
IEEE1284_PH_HBUSY_DNA,
IEEE1284_PH_REV_IDLE,
IEEE1284_PH_HBUSY_DAVAIL,
IEEE1284_PH_REV_DATA,
IEEE1284_PH_ECP_SETUP,
IEEE1284_PH_ECP_FWD_TO_REV,
IEEE1284_PH_ECP_REV_TO_FWD,
IEEE1284_PH_ECP_DIR_UNKNOWN,
};
struct ieee1284_info {
int mode;
volatile enum ieee1284_phase phase;
struct semaphore irq;
};
/* A parallel port */
struct parport {
unsigned long base; /* base address */
unsigned long base_hi; /* base address (hi - ECR) */
unsigned int size; /* IO extent */
const char *name;
unsigned int modes;
int irq; /* interrupt (or -1 for none) */
int dma;
int muxport; /* which muxport (if any) this is */
int portnum; /* which physical parallel port (not mux) */
struct device *dev; /* Physical device associated with IO/DMA.
* This may unfortulately be null if the
* port has a legacy driver .
*/
struct device bus_dev; /* to link with the bus */
struct parport *physport;
/* If this is a non-default mux
parport , i . e . we ' re a clone of a real
physical port , this is a pointer to that
port . The locking is only done in the
real port . For a clone port , the
following structure members are
meaningless : devices , cad , muxsel ,
waithead , waittail , flags , pdir ,
dev , ieee1284 , * _ lock .
It this is a default mux parport , or
there is no mux involved , this points to
ourself. */
struct pardevice *devices;
struct pardevice *cad; /* port owner */
int daisy; /* currently selected daisy addr */
int muxsel; /* currently selected mux port */
struct pardevice *waithead;
struct pardevice *waittail;
struct list_head list;
struct timer_list timer;
unsigned int flags;
void *sysctl_table;
struct parport_device_info probe_info[5 ]; /* 0-3 + non-IEEE1284.3 */
struct ieee1284_info ieee1284;
struct parport_operations *ops;
void *private_data; /* for lowlevel driver */
int number; /* port index - the `n' in `parportn' */
spinlock_t pardevice_lock;
spinlock_t waitlist_lock;
rwlock_t cad_lock;
int spintime;
atomic_t ref_count;
unsigned long devflags;
#define PARPORT_DEVPROC_REGISTERED 0
struct pardevice *proc_device; /* Currently register proc device */
struct list_head full_list;
struct parport *slaves[3 ];
};
#define to_parport_dev(n) container_of(n, struct parport, bus_dev)
#define DEFAULT_SPIN_TIME 500 /* us */
struct parport_driver {
const char *name;
void (*detach) (struct parport *);
void (*match_port)(struct parport *);
int (*probe)(struct pardevice *);
struct device_driver driver;
};
#define to_parport_driver(n) container_of(n, struct parport_driver, driver)
int parport_bus_init(void );
void parport_bus_exit(void );
/* parport_register_port registers a new parallel port at the given
address ( if one does not already exist ) and returns a pointer to it .
This entails claiming the I / O region , IRQ and DMA . NULL is returned
if initialisation fails. */
struct parport *parport_register_port(unsigned long base, int irq, int dma,
struct parport_operations *ops);
/* Once a registered port is ready for high-level drivers to use, the
low - level driver that registered it should announce it . This will
call the high - level drivers ' attach ( ) functions ( after things like
determining the IEEE 1284 . 3 topology of the port and collecting
DeviceIDs). */
void parport_announce_port (struct parport *port);
/* Unregister a port. */
extern void parport_remove_port(struct parport *port);
/* Register a new high-level driver. */
int __must_check __parport_register_driver(struct parport_driver *,
struct module *,
const char *mod_name);
/*
* parport_register_driver must be a macro so that KBUILD_MODNAME can
* be expanded
*/
/**
* parport_register_driver - register a parallel port device driver
* @ driver : structure describing the driver
*
* This can be called by a parallel port device driver in order
* to receive notifications about ports being found in the
* system , as well as ports no longer available .
*
* The @ driver structure is allocated by the caller and must not be
* deallocated until after calling parport_unregister_driver ( ) .
*
* If using the non device model :
* The driver ' s attach ( ) function may block . The port that
* attach ( ) is given will be valid for the duration of the
* callback , but if the driver wants to take a copy of the
* pointer it must call parport_get_port ( ) to do so . Calling
* parport_register_device ( ) on that port will do this for you .
*
* The driver ' s detach ( ) function may block . The port that
* detach ( ) is given will be valid for the duration of the
* callback , but if the driver wants to take a copy of the
* pointer it must call parport_get_port ( ) to do so .
*
*
* Returns 0 on success . The non device model will always succeeds .
* but the new device model can fail and will return the error code .
**/
#define parport_register_driver(driver) \
__parport_register_driver(driver, THIS_MODULE, KBUILD_MODNAME)
/* Unregister a high-level driver. */
void parport_unregister_driver(struct parport_driver *);
/**
* module_parport_driver ( ) - Helper macro for registering a modular parport driver
* @ _ _ parport_driver : struct parport_driver to be used
*
* Helper macro for parport drivers which do not do anything special in module
* init and exit . This eliminates a lot of boilerplate . Each module may only
* use this macro once , and calling it replaces module_init ( ) and module_exit ( ) .
*/
#define module_parport_driver(__parport_driver) \
module_driver(__parport_driver, parport_register_driver, parport_unregister_driver)
/* If parport_register_driver doesn't fit your needs, perhaps
* parport_find_xxx does. */
extern struct parport *parport_find_number (int );
extern struct parport *parport_find_base (unsigned long );
/* generic irq handler, if it suits your needs */
extern irqreturn_t parport_irq_handler(int irq, void *dev_id);
/* Reference counting for ports. */
extern struct parport *parport_get_port (struct parport *);
extern void parport_put_port (struct parport *);
void parport_del_port(struct parport *);
struct pardev_cb {
int (*preempt)(void *);
void (*wakeup)(void *);
void *private ;
void (*irq_func)(void *);
unsigned int flags;
};
/*
* parport_register_dev_model declares that a device is connected to a
* port , and tells the kernel all it needs to know .
*/
struct pardevice *
parport_register_dev_model(struct parport *port, const char *name,
const struct pardev_cb *par_dev_cb, int cnt);
/* parport_unregister unlinks a device from the chain. */
extern void parport_unregister_device(struct pardevice *dev);
/* parport_claim tries to gain ownership of the port for a particular
driver . This may fail ( return non - zero ) if another driver is busy .
If this driver has registered an interrupt handler , it will be
enabled. */
extern int parport_claim(struct pardevice *dev);
/* parport_claim_or_block is the same, but sleeps if the port cannot
be claimed . Return value is 1 if it slept , 0 normally and - errno
on error. */
extern int parport_claim_or_block(struct pardevice *dev);
/* parport_release reverses a previous parport_claim. This can never
fail , though the effects are undefined ( except that they are bad )
if you didn ' t previously own the port . Once you have released the
port you should make sure that neither your code nor the hardware
on the port tries to initiate any communication without first
re - claiming the port . If you mess with the port state ( enabling
ECP for example) you should clean up before releasing the port. */
extern void parport_release(struct pardevice *dev);
/**
* parport_yield - relinquish a parallel port temporarily
* @ dev : a device on the parallel port
*
* This function relinquishes the port if it would be helpful to other
* drivers to do so . Afterwards it tries to reclaim the port using
* parport_claim ( ) , and the return value is the same as for
* parport_claim ( ) . If it fails , the port is left unclaimed and it is
* the driver ' s responsibility to reclaim the port .
*
* The parport_yield ( ) and parport_yield_blocking ( ) functions are for
* marking points in the driver at which other drivers may claim the
* port and use their devices . Yielding the port is similar to
* releasing it and reclaiming it , but is more efficient because no
* action is taken if there are no other devices needing the port . In
* fact , nothing is done even if there are other devices waiting but
* the current device is still within its " timeslice " . The default
* timeslice is half a second , but it can be adjusted via the / proc
* interface .
**/
static __inline__ int parport_yield(struct pardevice *dev)
{
unsigned long int timeslip = (jiffies - dev->time);
if ((dev->port->waithead == NULL) || (timeslip < dev->timeslice))
return 0 ;
parport_release(dev);
return parport_claim(dev);
}
/**
* parport_yield_blocking - relinquish a parallel port temporarily
* @ dev : a device on the parallel port
*
* This function relinquishes the port if it would be helpful to other
* drivers to do so . Afterwards it tries to reclaim the port using
* parport_claim_or_block ( ) , and the return value is the same as for
* parport_claim_or_block ( ) .
**/
static __inline__ int parport_yield_blocking(struct pardevice *dev)
{
unsigned long int timeslip = (jiffies - dev->time);
if ((dev->port->waithead == NULL) || (timeslip < dev->timeslice))
return 0 ;
parport_release(dev);
return parport_claim_or_block(dev);
}
/* Flags used to identify what a device does. */
#define PARPORT_DEV_TRAN 0 /* WARNING !! DEPRECATED !! */
#define PARPORT_DEV_LURK (1 <<0 ) /* WARNING !! DEPRECATED !! */
#define PARPORT_DEV_EXCL (1 <<1 ) /* Need exclusive access. */
#define PARPORT_FLAG_EXCL (1 <<1 ) /* EXCL driver registered. */
/* IEEE1284 functions */
extern void parport_ieee1284_interrupt (void *);
extern int parport_negotiate (struct parport *, int mode);
extern ssize_t parport_write (struct parport *, const void *buf, size_t len);
extern ssize_t parport_read (struct parport *, void *buf, size_t len);
#define PARPORT_INACTIVITY_O_NONBLOCK 1
extern long parport_set_timeout (struct pardevice *, long inactivity);
extern int parport_wait_event (struct parport *, long timeout);
extern int parport_wait_peripheral (struct parport *port,
unsigned char mask,
unsigned char val);
extern int parport_poll_peripheral (struct parport *port,
unsigned char mask,
unsigned char val,
int usec);
/* For architectural drivers */
extern size_t parport_ieee1284_write_compat (struct parport *,
const void *, size_t, int );
extern size_t parport_ieee1284_read_nibble (struct parport *,
void *, size_t, int );
extern size_t parport_ieee1284_read_byte (struct parport *,
void *, size_t, int );
extern size_t parport_ieee1284_ecp_read_data (struct parport *,
void *, size_t, int );
extern size_t parport_ieee1284_ecp_write_data (struct parport *,
const void *, size_t, int );
extern size_t parport_ieee1284_ecp_write_addr (struct parport *,
const void *, size_t, int );
extern size_t parport_ieee1284_epp_write_data (struct parport *,
const void *, size_t, int );
extern size_t parport_ieee1284_epp_read_data (struct parport *,
void *, size_t, int );
extern size_t parport_ieee1284_epp_write_addr (struct parport *,
const void *, size_t, int );
extern size_t parport_ieee1284_epp_read_addr (struct parport *,
void *, size_t, int );
/* IEEE1284.3 functions */
#define daisy_dev_name "Device ID probe"
extern int parport_daisy_init (struct parport *port);
extern void parport_daisy_fini (struct parport *port);
extern struct pardevice *parport_open (int devnum, const char *name);
extern void parport_close (struct pardevice *dev);
extern ssize_t parport_device_id (int devnum, char *buffer, size_t len);
extern void parport_daisy_deselect_all (struct parport *port);
extern int parport_daisy_select (struct parport *port, int daisy, int mode);
/* Lowlevel drivers _can_ call this support function to handle irqs. */
static inline void parport_generic_irq(struct parport *port)
{
parport_ieee1284_interrupt (port);
read_lock(&port->cad_lock);
if (port->cad && port->cad->irq_func)
port->cad->irq_func(port->cad->private );
read_unlock(&port->cad_lock);
}
/* Prototypes from parport_procfs */
extern int parport_proc_register(struct parport *pp);
extern int parport_proc_unregister(struct parport *pp);
extern int parport_device_proc_register(struct pardevice *device);
extern int parport_device_proc_unregister(struct pardevice *device);
/* If PC hardware is the only type supported, we can optimise a bit. */
#if !defined (CONFIG_PARPORT_NOT_PC) && defined (CONFIG_PARPORT_PC)
#include <linux/parport_pc.h>
#define parport_write_data(p,x) parport_pc_write_data(p,x)
#define parport_read_data(p) parport_pc_read_data(p)
#define parport_write_control(p,x) parport_pc_write_control(p,x)
#define parport_read_control(p) parport_pc_read_control(p)
#define parport_frob_control(p,m,v) parport_pc_frob_control(p,m,v)
#define parport_read_status(p) parport_pc_read_status(p)
#define parport_enable_irq(p) parport_pc_enable_irq(p)
#define parport_disable_irq(p) parport_pc_disable_irq(p)
#define parport_data_forward(p) parport_pc_data_forward(p)
#define parport_data_reverse(p) parport_pc_data_reverse(p)
#else /* !CONFIG_PARPORT_NOT_PC */
/* Generic operations vector through the dispatch table. */
#define parport_write_data(p,x) (p)->ops->write_data(p,x)
#define parport_read_data(p) (p)->ops->read_data(p)
#define parport_write_control(p,x) (p)->ops->write_control(p,x)
#define parport_read_control(p) (p)->ops->read_control(p)
#define parport_frob_control(p,m,v) (p)->ops->frob_control(p,m,v)
#define parport_read_status(p) (p)->ops->read_status(p)
#define parport_enable_irq(p) (p)->ops->enable_irq(p)
#define parport_disable_irq(p) (p)->ops->disable_irq(p)
#define parport_data_forward(p) (p)->ops->data_forward(p)
#define parport_data_reverse(p) (p)->ops->data_reverse(p)
#endif /* !CONFIG_PARPORT_NOT_PC */
extern unsigned long parport_default_timeslice;
extern int parport_default_spintime;
#endif /* _PARPORT_H_ */
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