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Diffstat (limited to 'kernel/include/linux/parport.h')
| -rw-r--r-- | kernel/include/linux/parport.h | 481 |
1 files changed, 481 insertions, 0 deletions
diff --git a/kernel/include/linux/parport.h b/kernel/include/linux/parport.h new file mode 100644 index 000000000..c22f12547 --- /dev/null +++ b/kernel/include/linux/parport.h @@ -0,0 +1,481 @@ +/* + * 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 <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 ax88796_parport_state { + unsigned char cpr; +}; + +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; + struct ax88796_parport_state ax88796; + /* 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 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; +}; + +/* 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 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; + 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 DEFAULT_SPIN_TIME 500 /* us */ + +struct parport_driver { + const char *name; + void (*attach) (struct parport *); + void (*detach) (struct parport *); + struct list_head list; +}; + +/* 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. */ +extern int parport_register_driver (struct parport_driver *); + +/* Unregister a high-level driver. */ +extern void parport_unregister_driver (struct parport_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 *); + +/* parport_register_device declares that a device is connected to a + port, and tells the kernel all it needs to know. + - pf is the preemption function (may be NULL for no callback) + - kf is the wake-up function (may be NULL for no callback) + - irq_func is the interrupt handler (may be NULL for no interrupts) + - handle is a user pointer that gets handed to callback functions. */ +struct pardevice *parport_register_device(struct parport *port, + const char *name, + int (*pf)(void *), void (*kf)(void *), + void (*irq_func)(void *), + int flags, void *handle); + +/* 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 */ +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) + +#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_ */ |