Initial import

1 files changed, 481 insertions, 0 deletions

diff --git a/include/linux/parport.h b/include/linux/parport.h
new file mode 100644
index 000000000..c22f12547
--- /dev/null
+++ b/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_ */